JP6829741B2 - Fuel tank valve body - Google Patents

Fuel tank valve body Download PDF

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JP6829741B2
JP6829741B2 JP2019092493A JP2019092493A JP6829741B2 JP 6829741 B2 JP6829741 B2 JP 6829741B2 JP 2019092493 A JP2019092493 A JP 2019092493A JP 2019092493 A JP2019092493 A JP 2019092493A JP 6829741 B2 JP6829741 B2 JP 6829741B2
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valve body
fuel tank
valve
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政夫 岩見
政夫 岩見
匡史 岩見
匡史 岩見
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政夫 岩見
政夫 岩見
匡史 岩見
匡史 岩見
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Description

本発明は、自動車等に設けられた燃料タンクの弁体装置に関する。 The present invention relates to a valve body device for a fuel tank provided in an automobile or the like.

従来、前記自動車等に設けられた内燃機関の前記燃料タンクの給油口キャップには、前記燃料タンク内の燃料が消費された体積分だけ大気を取り込む必要があり、前記大気を取り込むための空気通路が設けられている。 Conventionally, the fuel filler port cap of the fuel tank of an internal combustion engine provided in an automobile or the like needs to take in the atmosphere by the volume of the fuel consumed in the fuel tank, and an air passage for taking in the atmosphere. Is provided.

従って、前記自動車等に設けられた前記燃料タンクが所定角度以上に傾斜した場合、前記空気通路から前記燃料が漏れ出して、その燃料に引火してしまうという危険性があった。 Therefore, when the fuel tank provided in the automobile or the like is tilted by a predetermined angle or more, there is a risk that the fuel leaks from the air passage and the fuel is ignited.

このため本出願人は、前記燃料タンクが所定角度まで傾斜したときには、前記燃料タンク内の前記燃料が、前記給油口キャップの本体内に設けた前記空気通路から流出しまうという不都合を確実に抑制することができる燃料タンクの給油口キャップを提案した（特許文献１及び２参照）。 Therefore, the applicant reliably suppresses the inconvenience that the fuel in the fuel tank flows out from the air passage provided in the main body of the fuel filler port cap when the fuel tank is tilted to a predetermined angle. We have proposed a fuel tank filler cap that can be used (see Patent Documents 1 and 2).

しかしながら、前述した特許文献１及び２にあっては、前記燃料タンクが所定角度まで傾斜して前記燃料が筒本体内に流入した場合、前記空気通路中に設けられた弁機構部を構成するフロートが外部側に浮き、同じく弁機構部を構成する球体がピストン及び前記フロートの移動により前記筒本体の縮径部に押し付けられて前記空気通路を閉鎖するが、前記燃料タンク内の圧力が高くなり過ぎた場合の安全弁としては考慮していないという問題があった。 However, in Patent Documents 1 and 2 described above, when the fuel tank is tilted to a predetermined angle and the fuel flows into the cylinder body, the float constituting the valve mechanism portion provided in the air passage is formed. Floats to the outside, and the sphere that also constitutes the valve mechanism is pressed against the reduced diameter portion of the cylinder body by the movement of the piston and the float to close the air passage, but the pressure inside the fuel tank increases. There was a problem that it was not considered as a safety valve when it passed .

特許第５０３０１５２号公報Japanese Patent No. 5030152 米国特許第７８２３６１１号公報U.S. Pat. No. 7,823,611

そこで本発明は、前記燃料タンクが傾斜して前記燃料タンクから前記燃料が流入した場合に、前記燃料を前記燃料タンクの外部に放出させることなく環境汚染を防止でき、燃費の向上も図ることができると共に前記燃料タンク内の圧力が高くなり過ぎた場合の安全弁としての機能を果たす燃料タンクの弁体装置を提供することを第１の目的とする。また前記燃料タンク内の圧力が所定値に達するまでは、前記燃料から蒸発した前記有害ガス又は前記燃料を前記燃料タンクの外部に放出させることなく環境汚染を防止でき、燃費の向上も図ることができると共に前記燃料タンク内の圧力が高くなり過ぎた場合の安全弁としての機能を果たす燃料タンクの弁体装置を提供することを第２の目的とする。 Therefore, according to the present invention, when the fuel tank is tilted and the fuel flows in from the fuel tank, environmental pollution can be prevented without releasing the fuel to the outside of the fuel tank, and fuel efficiency can be improved. A first object of the present invention is to provide a fuel tank valve body device that can function as a safety valve when the pressure in the fuel tank becomes too high . Further, until the pressure in the fuel tank reaches a predetermined value, environmental pollution can be prevented without releasing the harmful gas or the fuel evaporated from the fuel to the outside of the fuel tank, and fuel efficiency can be improved. A second object of the present invention is to provide a fuel tank valve body device that can function as a safety valve when the pressure in the fuel tank becomes too high .

このため第１の発明は、エンジンに供給される燃料を貯留する燃料タンクの上面に設けられた給油口を開閉すると共に閉じると前記給油口を介する前記燃料タンクと大気との連通を遮断する給油口キャップと、弁機構体とで構成される燃料タンクの弁体装置であって、
前記弁機構体は、
円筒状の外筒本体部と、該外筒本体部の略中心位置に前記外筒本体部の下部と連結部を介して連結すると共に上部に貯留部が形成される内筒本体部と、前記外筒本体部の下端部にて前記連結部とは下方へと段差を有して外方へと延びている取付部とを備え、前記内筒本体部内に形成された円柱状の第１空間、該第１空間に上方から連通する円錐台形状の第２空間、前記連結部の内側端部及び前記内筒本体部の下端部が切除されて形成されて前記第１空間に下方から連通する第３空間、前記連結部と前記取付部との段差により形成されて前記第３空間に下方から連通する第４空間及び前記第２空間を前記燃料タンク外部に連通させる開口が形成され、前記第２空間を形成する第１内側面に上下方向に長くて且つ間隔を存して内方へ突出した複数条の凸部を形成して各凸部間に形成される第１空気通路又は前記第１内側面に上下方向に長くて且つ間隔を存して複数個の凹部を形成することにより第２空気通路が形成される筒本体と、
上面を備えると共に下面を開口した有底中空円筒形状を呈して内部に空間を形成し、前記第１空間内に収納される下部の大径部と前記第２空間内に収納される外形が円錐台形状を呈する上部の小径部とを備える昇降部材と、
前記第２空間を形成する前記筒本体の前記第１内側面に突出した複数条の前記凸部に横方向の外周が点接触できる状態又は前記第１内側面に前記横方向の外周が線接触できる状態で前記昇降部材の前記小径部の上面上に載置される球状の弁体と、
前記昇降部材を押し上げて前記小径部上に載置された前記弁体の前記横方向の外周を複数条の前記凸部に押圧して点接触できるように又は前記昇降部材を押し上げて前記小径部上に載置された前記弁体の前記横方向の外周を前記筒本体の前記第１内側面に押圧して線接触できるように、前記昇降部材の前記空間内に配設されるコイルスプリングと、
前記昇降部材の前記空間内に収納される前記コイルスプリング内に遊挿されると共に小径空間が形成された小径部と、該小径部より大径でその上面上に前記コイルスプリングの下部を支承する段差部と、該段差部より大径であって前記小径空間に連通する大径空間が形成されて前記筒本体に形成した前記第４空間内に収納される大径部とを備えて中空円筒状を呈する吹上部材と、
平面視円形状を呈すると共に前記吹上部材の前記小径空間と前記燃料タンクとに連通する連通口を備えた下部と、該下部の上面中央部に立設した円柱状の上部とを備え、前記下部の上面周縁部が前記吹上部材の前記段差部の下面に当接した状態で前記吹上部材の前記大径空間内に前記下部が収納されると共に前記上部は前記吹上部材の前記小径空間を形成する第２内側面と離れた状態で前記小径空間内に収納される抵抗部材と、
前記昇降部材の前記空間内に配置した前記コイルスプリング内に、前記吹上部材の前記大径空間内に前記抵抗部材の前記下部を収納させると共に前記小径空間内に前記上部を配置させた状態の前記吹上部材を遊挿して、前記筒本体の前記第１空間及び前記第２空間内に前記弁体を上面上に載置した前記昇降部材を収納した状態で、前記筒本体の前記取付部下面に固定されると共に、前記燃料タンクに開設された開口に連通する連通路を備えて前記燃料タンクに直接に又は間接的に取り付けられる取付部材と、
中空円筒状を呈して空間内に異物を捕集して前記燃料タンク内に入り込むのを阻止する多孔質のフィルターを収納するもので、前記筒本体の前記内筒本体部に取り付けられる収納部材と、
前記収納部材内の空間と前記筒本体の前記外筒本体部内の空間とが大気と連通するように前記外筒本体部に上方から取り付けられる上蓋とを備え、
前記昇降部材上の前記弁体の前記横方向の外周が複数条の前記凸部に押圧して点接触する部位間の点接触しない前記横方向の外周の部分又は前記弁体の前記横方向の外周が前記第１内側面に押圧して線接触する部位間の線接触しない前記横方向の外周の部分と、前記弁体の中心と前記横方向の外周とを結んでできた面を外方へ延長した面で前記第１空気通路を形成する前記第１内側面及び該第１内側面の両隣の前記凸部を切断した前記第１空気通路の切り口である第１連通口又は前記弁体の中心と前記横方向の外周とを結んでできた面を外方へ延長した面で前記第２空気通路を形成する前記凹部を形成するための面を切断した前記第２空気通路の切り口である第２連通口とで面積が０．００２ｍｍ 2 以上〜０．０２ｍｍ 2 以下の弁部を構成し、
前記弁体と前記昇降部材との合計重量未満の付勢力で前記コイルスプリングが圧縮された状態で前記昇降部材及び前記弁体が下降していて、前記弁部において前記昇降部材上の前記弁体の前記横方向の外周が複数条の前記凸部に点接触していないか又は前記昇降部材上の前記弁体の前記横方向の外周が前記筒本体の前記第１内側面に線接触していない状態において、前記燃料タンクが傾斜した場合には、傾斜角度に応じて前記昇降部材と前記弁体との前記コイルスプリングに掛かる重量が減少し、前記コイルスプリングはその伸長する長さが増して所定の長さになると、前記弁体は前記筒本体の前記第１内側面の前記凸部に接触するか又は前記第１内側面に接触し、前記燃料タンクから前記取付部材の前記連通路を介する前記燃料は前記抵抗部材の前記連通口及び前記抵抗部材の前記上部が収納される前記吹上部材の前記小径空間により減圧された後、前記吹上部材の前記小径空間から前記昇降部材の前記空間内に噴出し、前記コイルスプリングの付勢力と相俟って、前記昇降部材と前記弁体を押し上げて、前記小径部上に載置された前記弁体の前記横方向の外周を複数条の前記凸部に押圧して点接触させ又は前記筒本体の前記第１内側面に押圧して線接触させ、
この弁部において前記弁体の前記横方向の外周が複数条の前記凸部に押圧して点接触又は前記筒本体の前記第１内側面に線接触した状態で、点接触しない前記横方向の外周の部分又は線接触しない前記横方向の外周の部分と前記第１連通口又は前記第２連通口とで構成される前記弁部の面積の大きさにより設定された第１通路抵抗又は第２通路抵抗と前記弁体と前記昇降部材との合計重量以上の前記コイルスプリングの付勢力の大きさとにより設定された所定の圧力値に前記燃料タンクからの前記燃料の圧力が達すると、前記抵抗部材の前記連通口、前記吹上部材の前記小径空間、前記昇降部材下端と前記吹上部材の前記大径部との隙間及び前記昇降部材と前記筒本体との隙間を介して前記第１通路抵抗に抗して前記第１空気通路内又は前記第２通路抵抗に抗して前記第２空気通路内を前記燃料が上昇して、前記弁部を通過して斜め上方に向けて上昇する前記燃料が前記コイルスプリングの付勢力に抗して前記弁体及び前記昇降部材を円錐台形状の前記第２空間内で斜め上方から下方へ下降させ、前記弁体の前記横方向の外周と複数条の前記凸部との点接触を解除するか又は前記弁体の前記横方向の外周と前記筒本体の前記内側面との線接触を解除することにより、前記燃料タンクからの前記燃料は前記筒本体の前記第１空間及び前記第２空間から前記開口を介して前記収納部材の前記空間内に流出し、流出した前記燃料は前記フィルター内部の前記空間内に吸収され、前記燃料タンクが水平状態に復帰した場合には、前記エンジンの駆動による前記燃料の消費により前記燃料タンク内の圧力が負圧になる際に、前記フィルターに吸収された前記燃料は前記貯留部に溜められると共に溜められた前記燃料は前記燃料タンクに戻される
ことを特徴とする。 Therefore, the first invention is a refueling that cuts off the communication between the fuel tank and the atmosphere through the refueling port when the refueling port provided on the upper surface of the fuel tank for storing the fuel supplied to the engine is opened and closed and closed. A fuel tank valve body device consisting of a mouth cap and a valve mechanism.
The valve mechanism is
A cylindrical outer cylinder main body, an inner cylinder main body that is connected to a substantially central position of the outer cylinder main body via a connecting portion with a lower portion of the outer cylinder main body, and an inner cylinder main body portion in which a storage portion is formed in the upper portion. A cylindrical first space formed in the inner cylinder main body portion, which is provided with a mounting portion which has a step downward and extends outward from the connecting portion at the lower end portion of the outer cylinder main body portion. , A conical trapezoidal second space communicating with the first space from above, an inner end portion of the connecting portion and a lower end portion of the inner cylinder main body portion are cut off and formed to communicate with the first space from below. An opening is formed in which a third space, a fourth space formed by a step between the connecting portion and the mounting portion and communicating with the third space from below, and the second space communicating with the outside of the fuel tank are formed. The first air passage or the first air passage formed between the convex portions by forming a plurality of convex portions protruding inward at intervals in the vertical direction on the first inner side surface forming the two spaces. 1 A cylinder body in which a second air passage is formed by forming a plurality of recesses on the inner side surface which are long in the vertical direction and at intervals.
It has a bottomed hollow cylindrical shape with an upper surface and an open lower surface to form a space inside, and the large diameter portion of the lower part housed in the first space and the outer shape housed in the second space are conical. An elevating member having a trapezoidal upper small diameter part,
A state in which the outer periphery in the lateral direction can make point contact with the convex portions of the plurality of strips protruding from the first inner side surface of the cylinder body forming the second space, or the outer circumference in the lateral direction makes line contact with the first inner surface surface. A spherical valve body that is placed on the upper surface of the small diameter portion of the elevating member in a state where it can be formed,
The elevating member is pushed up so that the lateral outer circumference of the valve body placed on the small-diameter portion is pressed against the convex portions of a plurality of rows so that point contact can be made, or the elevating member is pushed up and the small-diameter portion is pushed up. With a coil spring arranged in the space of the elevating member so that the lateral outer circumference of the valve body mounted on the valve body can be pressed against the first inner side surface of the cylinder body to make line contact. ,
A small-diameter portion that is loosely inserted into the coil spring housed in the space of the elevating member and has a small-diameter space formed, and a step that has a larger diameter than the small-diameter portion and supports the lower portion of the coil spring on the upper surface thereof. A hollow cylindrical portion including a portion and a large-diameter portion having a diameter larger than that of the step portion and communicating with the small-diameter space and being housed in the fourth space formed in the cylinder body. With the blow-up member that presents
A lower portion having a circular shape in a plan view and having a communication port for communicating with the small-diameter space of the blow-up member and the fuel tank, and a columnar upper portion erected in the center of the upper surface of the lower portion. The lower portion is housed in the large-diameter space of the blow-up member and the upper portion forms the small-diameter space of the blow-up member in a state where the upper peripheral edge portion of the blow-up member is in contact with the lower surface of the step portion of the blow-up member. A resistance member housed in the small-diameter space away from the second inner surface,
The lower part of the resistance member is housed in the large-diameter space of the blow-up member and the upper part is arranged in the small-diameter space in the coil spring arranged in the space of the elevating member. With the blow-up member loosely inserted and the elevating member on which the valve body is placed on the upper surface is housed in the first space and the second space of the cylinder body, it is placed on the lower surface of the mounting portion of the cylinder body. A mounting member that is fixed and that is directly or indirectly attached to the fuel tank with a communication passage that communicates with the opening provided in the fuel tank.
It has a hollow cylindrical shape and stores a porous filter that collects foreign matter in the space and prevents it from entering the fuel tank. With a storage member attached to the inner cylinder body of the cylinder body. ,
The space inside the storage member and the space inside the outer cylinder body of the cylinder body are provided with an upper lid attached to the outer cylinder body from above so as to communicate with the atmosphere.
The lateral outer peripheral portion of the valve body on the elevating member or the lateral outer peripheral portion of the valve body that does not make point contact between the portions where the lateral outer circumference presses against the convex portions of the plurality of strips and makes point contact. A surface formed by connecting the center of the valve body and the outer circumference in the lateral direction with the portion of the outer circumference in the lateral direction in which the outer circumference presses against the first inner surface and does not make line contact between the portions that make line contact is outward. The first communication port or the valve body which is the cut end of the first air passage formed by cutting the convex portions on both sides of the first inner side surface and the first inner side surface forming the first air passage on the surface extending to. At the cut end of the second air passage, the surface for forming the recess is cut off from the surface formed by connecting the center of the above and the outer circumference in the lateral direction and extending outward. area in there second communication port is configured to 0.002 mm 2 or more ～0.02Mm 2 or less of the valve portion,
The elevating member and the valve body are lowered in a state where the coil spring is compressed by an urging force less than the total weight of the valve body and the elevating member, and the valve body on the elevating member is lowered at the valve portion. The lateral outer circumference of the valve body is not in point contact with the convex portions of the plurality of rows, or the lateral outer circumference of the valve body on the elevating member is in line contact with the first inner side surface of the cylinder body. When the fuel tank is tilted in the absence state , the weight applied to the coil spring between the elevating member and the valve body is reduced according to the tilt angle, and the extension length of the coil spring is increased. When the valve body reaches a predetermined length, the valve body contacts the convex portion of the first inner side surface of the cylinder body or contacts the first inner side surface, and the communication passage of the mounting member from the fuel tank is reached. The fuel via the fuel is decompressed by the small diameter space of the blowing member in which the communication port of the resistance member and the upper portion of the resistance member are housed, and then from the small diameter space of the blowing member to the space of the elevating member. In combination with the urging force of the coil spring, the elevating member and the valve body are pushed up, and the outer periphery of the valve body placed on the small diameter portion in the lateral direction is covered with a plurality of the above. Press against the convex portion to make point contact, or press against the first inner side surface of the cylinder body to make line contact.
In the valve portion , the lateral outer periphery of the valve body presses against the convex portions of a plurality of strips to make point contact or line contact with the first inner side surface of the cylinder body, and the lateral direction does not make point contact. A first passage resistance or a second passage resistance set by the size of the area of the valve portion composed of the outer peripheral portion or the lateral outer peripheral portion that does not make line contact and the first communication port or the second communication port. When the pressure of the fuel from the fuel tank reaches a predetermined pressure value set by the passage resistance and the magnitude of the urging force of the coil spring equal to or greater than the total weight of the valve body and the elevating member, the resistance member The first passage resistance is resisted through the communication port, the small diameter space of the blow-up member, the gap between the lower end of the elevating member and the large diameter portion of the blow-up member, and the gap between the elevating member and the cylinder body. Then, the fuel rises in the first air passage or in the second air passage against the resistance of the second passage, passes through the valve portion, and rises diagonally upward. The valve body and the elevating member are lowered from diagonally upward to downward in the conical trapezoidal second space against the urging force of the coil spring, and the lateral outer circumference of the valve body and the plurality of protrusions are convex. By releasing the point contact with the portion or the line contact between the lateral outer circumference of the valve body and the inner side surface of the cylinder body, the fuel from the fuel tank is released from the cylinder body. The fuel that flowed out from the first space and the second space through the opening into the space of the storage member was absorbed into the space inside the filter, and the fuel tank returned to the horizontal state. In the case, when the pressure in the fuel tank becomes negative due to the consumption of the fuel by driving the engine, the fuel absorbed by the filter is stored in the storage unit and the stored fuel is stored. It is characterized in that it is returned to the fuel tank.

また第２の発明は、エンジンに供給される燃料を貯留する燃料タンクの上面に設けられた給油口を開閉すると共に閉じると前記給油口を介する前記燃料タンクと大気との連通を遮断する給油口キャップと、弁機構体とで構成される燃料タンクの弁体装置であって、
前記弁機構体は、
円筒状の外筒本体部と、該外筒本体部の略中心位置に前記外筒本体部の下部と連結部を介して連結すると共に上部に貯留部が形成される内筒本体部と、前記外筒本体部の下端部にて前記連結部とは下方へと段差を有して外方へと延びている取付部とを備え、前記内筒本体部内に形成された円柱状の第１空間、該第１空間に上方から連通する円錐台形状の第２空間、前記連結部の内側端部及び前記内筒本体部の下端部が切除されて形成されて前記第１空間に下方から連通する第３空間、前記連結部と前記取付部との段差により形成されて前記第３空間に下方から連通する第４空間及び前記第２空間を前記燃料タンク外部に連通させる開口が形成され、前記第２空間を形成する第１内側面に上下方向に長くて且つ間隔を存して内方へ突出した複数条の凸部を形成して各凸部間に形成される第１空気通路又は前記第１内側面に上下方向に長くて且つ間隔を存して複数個の凹部を形成することにより第２空気通路が形成される筒本体と、
上面を備えると共に下面を開口した有底中空円筒形状を呈して内部に空間を形成し、前記第１空間内に収納される下部の大径部と前記第２空間内に収納される外形が円錐台形状を呈する上部の小径部とを備える昇降部材と、
前記昇降部材の前記小径部の上面上に載置されて、前記第２空間を形成する前記筒本体の前記第１内側面に突出した複数条の前記凸部に横方向の外周が点接触するか又は前記第２空間を形成する前記筒本体の前記第１内側面に前記横方向の外周が線接触する球状の弁体と、
前記昇降部材の前記空間内に配設されて、前記昇降部材を押し上げて前記小径部上に載置された前記弁体の前記横方向の外周を複数条の前記凸部に押圧して点接触するように付勢するか又は前記昇降部材を押し上げて前記小径部上に載置された前記弁体の前記横方向の外周を前記筒本体の前記第１内側面に押圧して線接触するように付勢するコイルスプリングと、
前記昇降部材の前記空間内に収納される前記コイルスプリング内に遊挿されると共に小径空間が形成された小径部と、該小径部より大径でその上面上に前記コイルスプリングの下部を支承する段差部と、該段差部より大径であって前記小径空間に連通する大径空間が形成されて前記筒本体に形成した前記第４空間内に収納される大径部とを備えて中空円筒状を呈する吹上部材と、
平面視円形状を呈すると共に前記吹上部材の前記小径空間と前記燃料タンクとに連通する連通口を備えた下部と、該下部の上面中央部に立設した円柱状の上部とを備え、前記下部の上面周縁部が前記吹上部材の前記段差部の下面に当接した状態で前記吹上部材の前記大径空間内に前記下部が収納されると共に前記上部は前記吹上部材の前記小径空間を形成する第２内側面と離れた状態で前記小径空間内に収納される抵抗部材と、
前記昇降部材の前記空間内に配置した前記コイルスプリング内に、前記吹上部材の前記大径空間内に前記抵抗部材の前記下部を収納させると共に前記小径空間内に前記上部を配置させた状態の前記吹上部材を遊挿して、前記筒本体の前記第１空間及び前記第２空間内に前記弁体を上面上に載置した前記昇降部材を収納した状態で、前記筒本体の前記取付部下面に固定されると共に、前記燃料タンクに開設された開口に連通する連通路を備えて前記燃料タンクに直接に又は間接的に取り付けられる取付部材と、
中空円筒状を呈して空間内に異物を捕集して前記燃料タンク内に入り込むのを阻止する多孔質のフィルターを収納するもので、前記筒本体の前記内筒本体部に取り付けられる収納部材と、
前記収納部材内の空間と前記筒本体の前記外筒本体部内の空間とが大気と連通するように前記外筒本体部に上方から取り付けられる上蓋とを備え、
前記昇降部材上の前記弁体の前記横方向の外周が複数条の前記凸部に押圧して点接触する部位間の点接触しない前記横方向の外周の部分又は前記弁体の前記横方向の外周が前記第１内側面に押圧して線接触する部位間の線接触しない前記横方向の外周の部分と、前記弁体の中心と前記横方向の外周とを結んでできた面を外方へ延長した面で前記第１空気通路を形成する前記第１内側面及び該第１内側面の両隣の前記凸部を切断した前記第１空気通路の切り口である第１連通口又は前記弁体の中心と前記横方向の外周とを結んでできた面を外方へ延長した面で前記第２空気通路を形成する前記凹部を形成するための面を切断した前記第２空気通路の切り口である第２連通口とで面積が０．００２ｍｍ 2 以上〜０．０２ｍｍ 2 以下の弁部を構成し、
前記弁部において前記昇降部材上の前記弁体の前記横方向の外周が複数条の前記凸部に押圧して点接触している状態又は前記昇降部材上の前記弁体の前記横方向の外周が前記筒本体の前記第１内側面に押圧して線接触している状態において、前記燃料タンク内の前記燃料が蒸発した気化ガス又は膨張した前記燃料により前記燃料タンク内の圧力が高まって、点接触しない前記横方向の外周の部分又は線接触しない前記横方向の外周の部分と前記第１連通口又は前記第２連通口とで構成される前記弁部の面積の大きさにより設定された第１通路抵抗又は第２通路抵抗と前記弁体と前記昇降部材との合計重量以上の前記コイルスプリングの付勢力の大きさとにより設定された所定の圧力値に達すると、前記抵抗部材の前記連通口、前記吹上部材の前記小径空間、前記昇降部材下端と前記吹上部材の前記大径部との隙間及び前記昇降部材と前記筒本体との隙間を介して前記第１通路抵抗に抗して前記第１空気通路内又は前記第２通路抵抗に抗して前記第２空気通路内を前記気化ガス又は前記燃料が上昇して、前記弁部を通過して斜め上方に向けて上昇する前記気化ガス又は膨張した前記燃料が前記コイルスプリングの付勢力に抗して前記弁体及び前記昇降部材を円錐台形状の前記第２空間内で斜め上方から下方へ下降させ、前記弁体の前記横方向の外周と複数条の前記凸部との点接触を解除するか又は前記弁体の前記横方向の外周と前記筒本体の前記第１内側面との線接触を解除することにより、前記燃料タンク内の過大な圧力を前記第１空間、前記第２空間及び前記開口を介して前記燃料タンク外部に放出すると共に前記フィルターに前記燃料を吸収させる
ことを特徴とする。 The second invention is a refueling port that opens and closes and closes a refueling port provided on the upper surface of a fuel tank that stores fuel supplied to the engine to block communication between the fuel tank and the atmosphere via the refueling port. A fuel tank valve body device consisting of a cap and a valve mechanism.
The valve mechanism is
A cylindrical outer cylinder main body, an inner cylinder main body that is connected to a substantially central position of the outer cylinder main body via a connecting portion with a lower portion of the outer cylinder main body, and an inner cylinder main body portion in which a storage portion is formed in the upper portion. A cylindrical first space formed in the inner cylinder main body portion, which is provided with a mounting portion which has a step downward and extends outward from the connecting portion at the lower end portion of the outer cylinder main body portion. , A conical trapezoidal second space communicating with the first space from above, an inner end portion of the connecting portion and a lower end portion of the inner cylinder main body portion are cut off and formed to communicate with the first space from below. An opening is formed in which a third space, a fourth space formed by a step between the connecting portion and the mounting portion and communicating with the third space from below, and the second space communicating with the outside of the fuel tank are formed. The first air passage or the first air passage formed between the convex portions by forming a plurality of convex portions protruding inward at intervals in the vertical direction on the first inner side surface forming the two spaces. 1 A cylinder body in which a second air passage is formed by forming a plurality of recesses on the inner side surface which are long in the vertical direction and at intervals.
It has a bottomed hollow cylindrical shape with an upper surface and an open lower surface to form a space inside, and the large diameter portion of the lower part housed in the first space and the outer shape housed in the second space are conical. An elevating member having a trapezoidal upper small diameter part,
The outer circumference in the lateral direction makes point contact with the convex portions of the plurality of strips that are placed on the upper surface of the small diameter portion of the elevating member and project to the first inner side surface of the cylinder body that forms the second space. Alternatively, a spherical valve body in which the outer circumference in the lateral direction is in line contact with the first inner side surface of the cylinder body forming the second space.
The elevating member is arranged in the space, and the elevating member is pushed up to press the lateral outer circumference of the valve body placed on the small diameter portion against the convex portions of a plurality of rows to make point contact. The elevating member is pushed up so as to press the lateral outer circumference of the valve body mounted on the small diameter portion against the first inner side surface of the cylinder body so as to make line contact. and a coil spring for biasing,
A small-diameter portion that is loosely inserted into the coil spring housed in the space of the elevating member and has a small-diameter space formed, and a step that has a larger diameter than the small-diameter portion and supports the lower portion of the coil spring on the upper surface thereof. A hollow cylindrical portion including a portion and a large-diameter portion having a diameter larger than that of the step portion and communicating with the small-diameter space and being housed in the fourth space formed in the cylinder body. With the blow-up member that presents
A lower portion having a circular shape in a plan view and having a communication port for communicating with the small-diameter space of the blow-up member and the fuel tank, and a columnar upper portion erected in the center of the upper surface of the lower portion. The lower portion is housed in the large-diameter space of the blow-up member and the upper portion forms the small-diameter space of the blow-up member in a state where the upper peripheral edge portion of the blow-up member is in contact with the lower surface of the step portion of the blow-up member. A resistance member housed in the small-diameter space away from the second inner surface,
The lower part of the resistance member is housed in the large-diameter space of the blow-up member and the upper part is arranged in the small-diameter space in the coil spring arranged in the space of the elevating member. With the blow-up member loosely inserted and the elevating member on which the valve body is placed on the upper surface is housed in the first space and the second space of the cylinder body, it is placed on the lower surface of the mounting portion of the cylinder body. A mounting member that is fixed and that is directly or indirectly attached to the fuel tank with a communication passage that communicates with the opening provided in the fuel tank.
It has a hollow cylindrical shape and stores a porous filter that collects foreign matter in the space and prevents it from entering the fuel tank. With a storage member attached to the inner cylinder body of the cylinder body. ,
The space inside the storage member and the space inside the outer cylinder body of the cylinder body are provided with an upper lid attached to the outer cylinder body from above so as to communicate with the atmosphere.
The lateral outer peripheral portion of the valve body on the elevating member or the lateral outer peripheral portion of the valve body that does not make point contact between the portions where the lateral outer circumference presses against the convex portions of the plurality of strips and makes point contact. A surface formed by connecting the center of the valve body and the outer circumference in the lateral direction with the portion of the outer circumference in the lateral direction in which the outer circumference presses against the first inner surface and does not make line contact between the portions that make line contact is outward. The first communication port or the valve body which is the cut end of the first air passage formed by cutting the convex portions on both sides of the first inner side surface and the first inner side surface forming the first air passage on the surface extending to. At the cut end of the second air passage, the surface for forming the recess is cut off from the surface formed by connecting the center of the above and the outer circumference in the lateral direction and extending outward. area in there second communication port is configured to 0.002 mm 2 or more ～0.02Mm 2 or less of the valve portion,
In the valve portion, the lateral outer circumference of the valve body on the elevating member is pressed against the plurality of convex portions and is in point contact, or the lateral outer circumference of the valve body on the elevating member. The pressure in the fuel tank is increased by the vaporized gas in which the fuel in the fuel tank is evaporated or the expanded fuel in a state where the gas is pressed against the first inner side surface of the cylinder body and is in line contact with the fuel tank. It is set by the size of the area of the valve portion composed of the lateral outer peripheral portion that does not make point contact or the lateral outer peripheral portion that does not make line contact and the first communication port or the second communication port. When a predetermined pressure value set by the first passage resistance or the second passage resistance and the magnitude of the urging force of the coil spring equal to or greater than the total weight of the valve body and the elevating member is reached, the communication of the resistance member is reached. The mouth, the small-diameter space of the blow-up member, the gap between the lower end of the elevating member and the large-diameter portion of the blow-up member, and the gap between the elevating member and the cylinder body, against the first passage resistance. The vaporized gas or the fuel rises in the first air passage or in the second air passage against the resistance of the second passage, passes through the valve portion, and rises diagonally upward. Alternatively, the expanded fuel causes the valve body and the elevating member to descend from diagonally upward to downward in the conical trapezoidal second space against the urging force of the coil spring, in the lateral direction of the valve body. Inside the fuel tank by releasing the point contact between the outer circumference and the plurality of convex portions, or by releasing the line contact between the lateral outer circumference of the valve body and the first inner side surface of the cylinder body . The excessive pressure is discharged to the outside of the fuel tank through the first space, the second space, and the opening, and the filter absorbs the fuel.

本発明によれば、前記燃料タンクが傾斜して前記燃料タンクから前記燃料が流入した場合に、前記燃料を前記燃料タンクの外部に放出させることなく環境汚染を防止でき、燃費の向上も図ることができると共に前記燃料タンク内の圧力が高くなり過ぎた場合の安全弁としての機能を果たす燃料タンクの弁体装置を提供することができる。また、前記燃料タンク内の圧力が所定値に達するまでは、前記燃料から蒸発した前記有害ガス又は前記燃料を前記燃料タンクの外部に放出させることなく環境汚染を防止でき、燃費の向上も図ることができると共に前記燃料タンク内の圧力が高くなり過ぎた場合の安全弁としての機能を果たす燃料タンクの弁体装置を提供することができる。 According to the present invention, when the fuel tank is tilted and the fuel flows in from the fuel tank, environmental pollution can be prevented without releasing the fuel to the outside of the fuel tank, and fuel efficiency can be improved. It is possible to provide a fuel tank valve body device that functions as a safety valve when the pressure in the fuel tank becomes too high . Further, until the pressure in the fuel tank reaches a predetermined value, environmental pollution can be prevented without releasing the harmful gas or the fuel evaporated from the fuel to the outside of the fuel tank, and the fuel efficiency can be improved. It is possible to provide a valve body device of the fuel tank which functions as a safety valve when the pressure in the fuel tank becomes too high .

本発明の燃料タンクの給油口キャップを適用した自動車の概略図である。It is the schematic of the automobile to which the fuel filler port cap of the fuel tank of this invention is applied. 前記給油口キャップの平面図である。It is a top view of the filler port cap. 前記給油口キャップの裏面図である。It is a back view of the fuel filler cap. 前記給油口キャップを構成する外蓋と内蓋とを分解した状態の縦断面図である。It is a vertical cross-sectional view of the state which disassembled the outer lid and the inner lid which make up the fuel filler port cap. 前記給油口キャップを構成する前記外蓋の裏面図である。It is a back view of the outer lid which constitutes the fuel filler port cap. 前記給油口キャップを構成する前記内蓋の表面図である。It is a surface view of the inner lid which constitutes the fuel filler port cap. 筒本体とこの筒本体内に収納される各部品の縦断面図や平面図であり、前記筒本体の縦断面図（Ａ）、弁体の縦断面図（Ｂ）、昇降部材の縦断面図（Ｃ）、他の実施形態の前記昇降部材の縦断面図（Ｄ）、第２の他の実施形態の前記昇降部材の縦断面図（Ｅ）、前記昇降部材の裏面図（Ｆ）、コイルスプリングの縦断面図（Ｇ）、スプリングの平面図（Ｈ）と、前記スプリングの平面図（Ｈ）のＸ−Ｘ断面図（Ｉ）、リベットの側面図（Ｊ）である。It is a vertical cross-sectional view or a plan view of a cylinder main body and each component housed in this cylinder main body, and is a vertical sectional view (A) of the cylinder main body, a vertical sectional view (B) of a valve body, and a vertical sectional view of an elevating member. (C), vertical cross-sectional view (D) of the elevating member of another embodiment, vertical cross-sectional view (E) of the elevating member of the second other embodiment, back view (F) of the elevating member, coil. It is a vertical sectional view (G) of the spring, a plan view (H) of the spring, an XX sectional view (I) of the plan view (H) of the spring, and a side view (J) of the rivet. 前記給油口キャップの縦断面図である。It is a vertical sectional view of the fuel filler port cap. 前記弁体の横方向の外周が前記筒本体の第２側壁の内側面に突出した複数条の凸部の頂部に点接触した状態の要部の縦断面図である。It is a vertical cross-sectional view of a main part in a state where the outer circumference in the lateral direction of the valve body is in point contact with the top of a plurality of convex portions protruding from the inner side surface of the second side wall of the cylinder body. 前記弁体及び前記昇降部材が下降した状態の要部の縦断面図である。It is a vertical cross-sectional view of the main part in the state where the valve body and the elevating member are lowered. 前記弁体の前記横方向の外周が前記筒本体の前記第２側壁の前記内側面に突出した複数条の前記凸部の前記頂部に点接触した位置で横断面した底面図（Ｋ）及び同じ位置で前記弁体を除いた状態で横断面した底面図（Ｌ）である。The same as the bottom view (K) in which the outer circumference of the valve body in the lateral direction is cross-sectionally cross-sectional at a position where the outer periphery of the valve body is in point contact with the top of the convex portion of the plurality of strips protruding from the inner surface of the second side wall of the cylinder body. It is a bottom view (L) of the cross section in a state where the valve body is removed at a position. ネジ式で給油口に取り付ける構造の給油口キャップの縦断面図である。It is a vertical sectional view of the fuel filler port cap of the structure which attaches to the fuel filler port by a screw type. 前記弁体の前記横方向の外周が前記筒本体の前記第２側壁の内側面に線接触した状態の要部の縦断面図である。It is a vertical cross-sectional view of the main part in a state where the outer circumference in the lateral direction of the valve body is in line contact with the inner side surface of the second side wall of the cylinder body. 前記弁体の前記横方向の外周が前記筒本体の前記第２側壁の前記内側面に線接触した位置で横断面した底面図（Ｍ）及び同じ位置で前記弁体を除いた状態で横断面した底面図（Ｎ）である。A cross-sectional view (M) at a position where the outer circumference of the valve body in the lateral direction is in line contact with the inner side surface of the second side wall of the cylinder body and a cross section at the same position with the valve body removed. It is a bottom view (N). 前記弁体及び前記昇降部材を一体にして構成した例を示す第２の実施形態を示し、弁体部の横方向の外周が前記筒本体の前記第２側壁の前記内側面に突出した複数条の前記凸部の前記頂部に点接触した状態の要部の縦断面図である。A second embodiment showing an example in which the valve body and the elevating member are integrally formed is shown, and a plurality of strips having a lateral outer circumference of the valve body portion protruding from the inner side surface of the second side wall of the cylinder body. It is a vertical cross-sectional view of a main part in a state of point contact with the top of the convex portion of the above. 図１５の第２の実施形態において、前記昇降部材が下降した状態の要部の縦断面図である。FIG. 15 is a vertical cross-sectional view of a main part in a state where the elevating member is lowered in the second embodiment of FIG. 前記弁体及び前記昇降部材を一体にして構成した例を示す第３の実施形態を示し、弁体部の横方向の外周が前記筒本体の前記第２側壁の前記内側面に突出した複数条の前記凸部の前記頂部に点接触した状態の要部の縦断面図である。A third embodiment showing an example in which the valve body and the elevating member are integrally formed is shown, and a plurality of strips having a lateral outer circumference of the valve body portion protruding from the inner side surface of the second side wall of the cylinder body. It is a vertical cross-sectional view of a main part in a state of point contact with the top of the convex portion of the above. 図１７の第３の実施形態において、前記弁体部が下降した状態の要部の縦断面図である。In the third embodiment of FIG. 17, it is a vertical sectional view of a main part in a state where the valve body part is lowered. 第２の実施形態の前記給油口キャップにおける筒本体とこの筒本体内に収納される各部品の縦断面図、平面図、底面図であり、前記筒本体の縦断面図（ＡＡ）、前記筒本体の側壁を横断面した状態の底面図（ＡＢ）、前記弁体の縦断面図（Ｂ）、前記昇降部材の縦断面図（Ｃ）、前記昇降部材の裏面図（Ｆ）、前記スプリングの縦断面図（Ｇ）、吹上部材の縦断面図（ＯＡ）、前記吹上部材の平面図（ＯＢ）、前記吹上部材の底面図（ＯＣ）、第１抵抗部材の底面図（ＰＡ）、前記第２抵抗部材の平面図（ＰＢ）、前記第１抵抗部材の縦断面図（ＰＣ）、第２抵抗部材の縦断面図（ＱＡ）、前記第２抵抗部材の平面図（ＱＢ）、前記蓋体の平面図（Ｈ）と、前記蓋体の平面図（Ｈ）のＸ−Ｘ断面図（ｉ）、前記リベットの側面図（ｊ）である。It is a vertical sectional view, a plan view, and a bottom view of a cylinder main body in the fuel filler port cap of the 2nd Embodiment and each component housed in the cylinder main body, and is the vertical sectional view (AA) of the cylinder main body, and said cylinder. Bottom view (AB) of the side wall of the main body in a cross section, vertical cross-sectional view (B) of the valve body, vertical cross-sectional view (C) of the elevating member, back surface view (F) of the elevating member, and the spring. Vertical cross-sectional view (G), vertical cross-sectional view of the blow-up member (OA), plan view of the blow-up member (OB), bottom view of the blow-up member (OC), bottom view of the first resistance member (PA), the first A plan view (PB) of the two resistance members, a vertical sectional view (PC) of the first resistance member, a vertical sectional view (QA) of the second resistance member, a plan view (QB) of the second resistance member, and the lid. (H), a plan view (H) of the lid body (H), an XX cross-sectional view (i), and a side view (j) of the rivet. 前記弁体が上昇している状態を示す第２の実施形態の前記給油口キャップの縦断面図である。It is a vertical sectional view of the fuel filler port cap of the 2nd Embodiment which shows the state which the valve body is raised. 前記弁体が下降している状態を示す第２の実施形態の前記給油口キャップの縦断面図である。It is a vertical sectional view of the fuel filler port cap of the 2nd Embodiment which shows the state which the valve body is lowered. 前記弁体が傾斜している状態を示す第２の実施形態の前記給油口キャップの縦断面図である。It is a vertical sectional view of the fuel filler port cap of the 2nd Embodiment which shows the state in which the valve body is inclined. 前記弁体が下降している状態を示す第３の実施形態の前記給油口キャップの縦断面図である。It is a vertical sectional view of the fuel filler port cap of the 3rd Embodiment which shows the state which the valve body is lowered. 前記弁体が傾斜している状態を示す第３の実施形態の前記給油口キャップの縦断面図である。It is a vertical sectional view of the fuel filler port cap of the 3rd Embodiment which shows the state in which the valve body is inclined. 燃料タンクの弁体装置を適用した自動車の概略図である。It is the schematic of the automobile to which the valve body device of a fuel tank is applied. 第２の実施形態の弁機構体における各部品の縦断面図、平面図、底面図であり、ネジの正面図（Ｒ）、上蓋の縦断面図（ＳＡ）、前記上蓋の平面図（ＳＢ）、前記上蓋の底面図（ＳＣ）、フィルターの縦断面図（ＴＡ）、前記フィルターの平面図（ＴＢ）、収納部材の縦断面図（ＵＡ）、前記収納部材の平面図（ＵＢ）、前記収納部材の底面図（ＵＣ）、筒本体の縦断面図（ＷＡ）、前記筒本体の平面図（ＷＢ）、前記筒本体の底面図（ＷＣ）、取付部材の縦断面図（ＸＡ）、前記取付部材の平面図（ＸＢ）、前記取付部材の底面図（ＸＣ）である。It is a vertical sectional view, a plan view, and a bottom view of each component in the valve mechanism body of the second embodiment, and is a front view (R) of a screw, a vertical sectional view (SA) of an upper lid, and a plan view (SB) of the upper lid. , Bottom view (SC) of the upper lid, vertical cross-sectional view (TA) of the filter, plan view (TB) of the filter, vertical cross-sectional view (UA) of the storage member, plan view (UB) of the storage member, the storage. Bottom view (UC) of the member, vertical cross-sectional view (WA) of the cylinder body, plan view (WB) of the cylinder body, bottom view (WC) of the cylinder body, vertical cross-sectional view (XA) of the mounting member, the mounting It is a top view (XB) of a member and a bottom view (XC) of the mounting member. 前記弁体が下降していて、第２の実施形態の弁機構体の水平状態を示す縦断面図である。It is a vertical cross-sectional view which shows the horizontal state of the valve mechanism body of the 2nd Embodiment in which the valve body is lowered . 第２の実施形態の弁機構体の傾斜している状態で、前記弁体が上昇した状態を示す縦断面図である。FIG. 3 is a vertical cross-sectional view showing a state in which the valve body is raised in a state where the valve mechanism body of the second embodiment is tilted. 前記弁体が上昇していて、第２の実施形態の弁機構体の水平状態を示す縦断面図である。It is a vertical sectional view which shows the horizontal state of the valve mechanism body of the 2nd Embodiment in which the valve body is raised .

（１）給油口キャップの第１の実施形態（図１乃至図１４参照）
（１−１）筒本体１６の第１の実施形態（弁部ＶＡ、図１乃至図１２参照）
以下、本発明の実施の形態を図面に基づいて説明する。先ず、図１に示すように、本実施形態における燃料タンク１００の給油口キャップ１０は、自動車、農機具、発電機、芝刈り機、オートバイ、船舶、建設機械、道路工事用機械等（以後、これらを総称して「自動車１０１」という。）に搭載され、エンジン９９に燃料（本実施形態では、ガソリン）の供給を行う前記燃料タンク１００の給油口９８を開閉するものである。尚、前記燃料タンク１００と前記エンジン９９との間には、気化器９５が配管接続されている。 (1) First Embodiment of Refueling Port Cap (See FIGS. 1 to 14)
(1-1) The first embodiment of the cylinder body 16 (see valve portion VA, FIGS. 1 to 12).
Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, as shown in FIG. 1, the fuel filler cap 10 of the fuel tank 100 in the present embodiment includes automobiles, agricultural machinery, generators, lawnmowers, motorcycles, ships, construction machinery, road construction machinery, and the like (hereinafter, these). Is generically referred to as “automobile 101”), and opens and closes the fuel filler port 98 of the fuel tank 100 that supplies fuel (gasoline in the present embodiment) to the engine 99. A vaporizer 95 is connected by piping between the fuel tank 100 and the engine 99.

前記給油口キャップ１０は、図２、図３及び図４に示すように、側壁１２Ｃに手回し用の凹凸部１１が形成されて収納空間１２Ａを備えたアウターケース（以下、「外蓋」という。）１２と、該外蓋１２の前記収納空間１２Ａ内に取付けられるインナーケース（以下、「内蓋」という。）１３とから構成されるキャップ本体１４を備えている。そして、この内蓋１３には後述する弁機構部が備えられる。前記凹凸部１１は、凸部１１Ａと凹部１１Ｂとが交互に繰り返して形成される。 As shown in FIGS. 2, 3 and 4, the fuel filler cap 10 is an outer case (hereinafter referred to as an "outer lid") having a storage space 12A formed by forming an uneven portion 11 for hand rotation on the side wall 12C. ) 12, And a cap body 14 composed of an inner case (hereinafter, referred to as “inner lid”) 13 mounted in the storage space 12A of the outer lid 12. The inner lid 13 is provided with a valve mechanism portion described later. The uneven portion 11 is formed by alternately repeating the convex portion 11A and the concave portion 11B.

前記外蓋１２は上壁１２Ｂと前記側壁１２Ｃとを備えた概ね有底円筒形状を呈しており、前記上壁１２Ｂと前記側壁１２Ｃとで形成される前記収納空間１２Ａ内に、後述するフィルター３８が取り付けられた前記内蓋１３を収納した状態で、前記内蓋１３が前記外蓋１２に取り付けられる。 The outer lid 12 has a substantially bottomed cylindrical shape having an upper wall 12B and a side wall 12C, and a filter 38 described later is contained in the storage space 12A formed by the upper wall 12B and the side wall 12C. The inner lid 13 is attached to the outer lid 12 in a state where the inner lid 13 to which the is attached is housed.

そして、図４、図６及び図７に示すように、前記内蓋１３の内面側の略中心位置に、前記内蓋１３の底壁１３Ａと一体に中空の筒本体１６が立設されている。前記筒本体１６は円柱状の第１空間ＳＩを備えた中空の円筒形状の本体部１６Ａと、該本体部１６Ａの上部に円錐台形状の第２空間Ｓ２を備えると共に外形が円錐台形状を呈する空気通路形成部１６Ｂとから構成される。しかし、以上のように、前記筒本体１６は当初から前記内蓋１３の前記底壁１３Ａと一体に成形してもよいが、独立した前記筒本体１６を前記内蓋１３の前記底壁１３Ａに固定するようにしてもよい。 Then, as shown in FIGS. 4, 6 and 7, a hollow cylinder body 16 is erected integrally with the bottom wall 13A of the inner lid 13 at a substantially center position on the inner surface side of the inner lid 13. .. The tubular body 16 is provided with a hollow cylindrical main body 16A having a cylindrical first space SI and a truncated cone-shaped second space S2 above the main body 16A, and has a truncated cone shape in outer shape. It is composed of an air passage forming portion 16B. However, as described above, the cylinder body 16 may be integrally molded with the bottom wall 13A of the inner lid 13 from the beginning, but the independent cylinder body 16 is formed on the bottom wall 13A of the inner lid 13. It may be fixed.

また、前記筒本体１６は下から第１側壁１６Ｃと、該第１側壁１６Ｃ上部に設けられる下水平壁１６Ｄと、該下水平壁１６Ｄの上部に設けられる第２側壁１６Ｅと、該第２側壁１６Ｅの上部に設けられると共に前記筒本体１６内の空間（前記第２空間Ｓ２を含む。）と前記燃料タンク１００外部（大気）とを連通させる開口Ｓ３がその中央部に形成された上水平壁１６Ｆとから構成される。前記第２側壁１６Ｅは、上方に向かうに従って内径が小さくなるような内側面１６Ｅ１を有する。 Further, the cylinder body 16 has a first side wall 16C from the bottom, a lower horizontal wall 16D provided on the upper part of the first side wall 16C, a second side wall 16E provided on the upper part of the lower horizontal wall 16D, and the second side wall. An upper horizontal wall provided in the upper part of the 16E and having an opening S3 formed in the central portion thereof to communicate the space inside the cylinder body 16 (including the second space S2) and the outside (atmosphere) of the fuel tank 100. It is composed of 16F. The second side wall 16E has an inner side surface 16E1 whose inner diameter decreases toward the top.

そして、図８に示すように、前記外蓋１２に前記内蓋１３を収納した状態で取り付けた状態では、前記外蓋１２の前記上壁１２Ｂの裏面に形成された空間１２Ｓ内に、前記筒本体１６の前記上水平壁１６Ｆが前記上壁１２Ｂ裏面に当接しないように間隔を存して入り込むように収納される。 Then, as shown in FIG. 8, when the inner lid 13 is attached to the outer lid 12 in a housed state, the cylinder is contained in the space 12S formed on the back surface of the upper wall 12B of the outer lid 12. The upper horizontal wall 16F of the main body 16 is housed so as to enter with a gap so as not to abut on the back surface of the upper wall 12B.

そして、前記開口Ｓ３と前記第２空間Ｓ２とに連通する複数の第１空気通路１５が前記筒本体１６の前記第２側壁１６Ｅに形成される。詳述すると、前記第２側壁１６Ｅの前記内側面１６Ｅ１（前記第２空間Ｓ２を形成する内側面）に、所定の間隔を存して、上下方向に延びて、横断平面が、例えば三角形状の凸部１６Ｔが複数条（例えば、８条）形成される。また、前記凸部１６Ｔは前記内側面１６Ｅ１に沿ってその高さが同じで、前記第２空間Ｓ２内に突出して、各凸部１６Ｔ間に前記第１空気通路１５が形成されることとなる。即ち、前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１には、前記凸部１６Ｔと前記第１空気通路１５とが交互に形成されることとなる。 Then, a plurality of first air passages 15 communicating with the opening S3 and the second space S2 are formed in the second side wall 16E of the cylinder body 16. More specifically, the inner side surface 16E1 (the inner side surface forming the second space S2) of the second side wall 16E extends in the vertical direction with a predetermined interval, and the cross-sectional plane has a triangular shape, for example. A plurality of protrusions (for example, eight rows) of the convex portions 16T are formed. Further, the convex portion 16T has the same height along the inner side surface 16E1 and projects into the second space S2, so that the first air passage 15 is formed between the convex portions 16T. .. That is, the convex portion 16T and the first air passage 15 are alternately formed on the inner side surface 16E1 of the second side wall 16E of the cylinder body 16.

そして、図７乃至図１１において、２２はステンレス製の球状のボールから構成された弁体であり、後述するように、その一部が前記凸部１６Ｔに接することができるように、昇降部材２３の小径部２３Ｂの上面上に載置した状態で、前記第２空間Ｓ２内に収納される。 Then, in FIGS. 7 to 11, reference numeral 22 denotes a valve body made of a spherical stainless steel ball, and as will be described later, the elevating member 23 so that a part thereof can come into contact with the convex portion 16T. It is housed in the second space S2 in a state of being placed on the upper surface of the small diameter portion 23B of the above.

前記弁体２２を載置させて支持する前記昇降部材２３は、上面を備えて下面を開口した有底中空円筒形状を呈して、円柱状の第１空間Ｓ１内に収納される下部の大径部２３Ａと前記第２空間Ｓ２内に収納される上部の外形が円錐台形状を呈する前記小径部２３Ｂとを備えている。前記弁体２２は、前記小径部２３Ｂ上に載置されたときに、その上部が前記開口Ｓ３に面することとなる。 The elevating member 23 on which the valve body 22 is placed and supported has a bottomed hollow cylindrical shape having an upper surface and an open lower surface, and has a large diameter of a lower portion housed in a cylindrical first space S1. The portion 23A and the small-diameter portion 23B whose outer shape of the upper portion housed in the second space S2 has a truncated cone shape are provided. When the valve body 22 is placed on the small diameter portion 23B, the upper portion thereof faces the opening S3.

そして、前記昇降部材２３に形成された空間２３Ｓ内には、この昇降部材２３を上昇させるように伸張した状態で付勢する付勢体であるコイルスプリング（以下、「スプリング」という。）１７が収納される。 Then, in the space 23S formed in the elevating member 23, a coil spring (hereinafter, referred to as "spring") 17 which is an urging body that urges the elevating member 23 in an extended state so as to raise the elevating member 23 is provided. It is stored.

そして、前記内蓋１３の前記底壁１３Ａに形成された固定孔１３Ｇ（図６参照）と取付部材としてのスプリング３３に形成された固定孔３３Ａとにリベット３４が挿入されて、前記底壁１３Ａに前記スプリング３３が固定される。尚、前記スプリング３３は、錆びにくく、前記燃料によって溶解することのない金属材料で作製する。 Then, the rivet 34 is inserted into the fixing hole 13G (see FIG. 6) formed in the bottom wall 13A of the inner lid 13 and the fixing hole 33A formed in the spring 33 as a mounting member, and the bottom wall 13A is inserted. The spring 33 is fixed to the rivet. The spring 33 is made of a metal material that does not easily rust and is not dissolved by the fuel.

そして、板バネ材料で作製された前記スプリング３３の中央部に連通路を構成する開口３３Ｂが開設されて、前記昇降部材２３の前記空間２３Ｓと前記燃料タンク１００とに連通する空気通路が形成される。なお、前記スプリング３３は、前記空気通路等を形成する通路形成体であると共に、前記燃料タンク１００の前記給油口９８に前記給油口キャップ１０（前記キャップ本体１４）を取付け固定するための固定具でもある。 Then, an opening 33B forming a communication passage is opened in the central portion of the spring 33 made of a leaf spring material, and an air passage communicating with the space 23S of the elevating member 23 and the fuel tank 100 is formed. To. The spring 33 is a passage forming body that forms the air passage and the like, and is a fixture for attaching and fixing the fuel filler cap 10 (cap body 14) to the fuel filler port 98 of the fuel tank 100. But also.

従って、前記弁体２２を前記小径部２３Ｂの上面上に載置すると共に前記空間２３Ｓ内に前記スプリング１７を収納した前記昇降部材２３を前記筒本体１６の前記第１空間Ｓ１及び前記第２空間Ｓ２内に収納して、前記内蓋１３の前記底壁１３Ａの前記固定孔１３Ｇと前記スプリング３３の前記固定孔３３Ａとに前記リベット３４を挿入することにより、前記内蓋１３の前記底壁１３Ａに前記スプリング３３が固定される。 Therefore, the valve body 22 is placed on the upper surface of the small diameter portion 23B, and the elevating member 23 in which the spring 17 is housed in the space 23S is placed in the first space S1 and the second space of the cylinder body 16. By inserting the rivet 34 into the fixing hole 13G of the bottom wall 13A of the inner lid 13 and the fixing hole 33A of the spring 33 by accommodating in S2, the bottom wall 13A of the inner lid 13 is inserted. The spring 33 is fixed to the rivet.

すると、前記昇降部材２３の前記小径部２３Ｂ上に前記弁体２２が載置した状態で、前記スプリング１７の付勢力により前記昇降部材２３を上方へ押し上げ、前記弁機構部を構成する前記弁体２２の上半球の上下方向における、例えば1／２の位置における横方向の外周ＣＦ（「水平方向に切断した面の円周」であって、以下「前記弁体２２の前記横方向の外周ＣＦ」と略す。）が前記第２側壁１６Ｅの前記内側面１６Ｅ１に突出した複数条の前記凸部１６Ｔの頂部（前記第２空間Ｓ２内への突出方向における頂部）に前記スプリング１７の付勢力により押圧されて点接触することとなる。 Then, with the valve body 22 mounted on the small diameter portion 23B of the elevating member 23, the elevating member 23 is pushed upward by the urging force of the spring 17, and the valve body constituting the valve mechanism portion is formed. Lateral outer circumference CF in the vertical direction of the upper hemisphere of 22, for example, at a position of 1/2 (“circumference of a surface cut in the horizontal direction”, hereinafter “the lateral outer circumference CF of the valve body 22”. (Abbreviated as) is projected onto the inner side surface 16E1 of the second side wall 16E by the urging force of the spring 17 on the top of the convex portion 16T (the top in the direction of protrusion into the second space S2). It is pressed and makes point contact.

そして、本実施形態では、前記弁部ＶＡは前記弁体２２の前述した前記横方向の外周ＣＦが前記第２側壁１６Ｅの前記内側面１６Ｅ１に突出した複数条の前記凸部１６Ｔの前記頂部に押圧して点接触する部位間の前記弁体２２の横方向の点接触しない前記横方向の外周の部分ＣＦ１と、前記弁体２２の中心ＣＯと前記横方向の外周ＣＦとを結んでできた面ＣＳ（例えば、円錐面）を外方へ延長した面で前記第１空気通路１５を形成する前記内側面１６Ｅ１及び該内側面１６Ｅ１の両隣の前記凸部１６Ｔを切断した前記第１空気通路１５の切り口である第１連通口ＲＡとで構成される。 Then, in the present embodiment, the valve portion VA is formed on the top of the convex portion 16T having a plurality of strips in which the lateral outer peripheral CF of the valve body 22 projects from the inner side surface 16E1 of the second side wall 16E. It is formed by connecting the lateral outer peripheral portion CF1 of the valve body 22 that does not make lateral point contact between the parts that are pressed and point-contacted, and the central CO of the valve body 22 and the lateral outer peripheral CF. The first air passage 15 in which the inner side surface 16E1 forming the first air passage 15 and the convex portions 16T on both sides of the inner side surface 16E1 are cut by a surface extending outward from the surface CS (for example, a conical surface). It is composed of the first communication port RA, which is the cut end of.

なお、前記弁部は、１又はそれ以上であってもよく、他の実施形態においても同様である。また詳述すると、前述した前記面ＣＳを外方へ延長した面については、半径方向の外方へ延長したり、斜め上方向へ延長して形成した面である。 The valve portion may be one or more, and the same applies to other embodiments. More specifically, the surface obtained by extending the above-mentioned surface CS outward is a surface formed by extending outward in the radial direction or extending diagonally upward.

前記弁部ＶＡにおいては、前記弁体２２の前記横方向の外周ＣＦが前記第２側壁１６Ｅの複数条の前記凸部１６Ｔの前記頂部に点接触している部位と前記第２側壁１６Ｅに接触していない部位が形成されることとなる。従って、前述したように、点接触しない前記横方向の外周の部分ＣＦ１と前記第１連通口ＲＡとで構成される面積が極小さい前記弁部ＶＡが形成されることとなる。 In the valve portion VA, the portion where the lateral outer peripheral CF of the valve body 22 is in point contact with the top of the convex portion 16T of the plurality of strips of the second side wall 16E is in contact with the second side wall 16E. A part that has not been formed will be formed. Therefore, as described above, the valve portion VA having an extremely small area composed of the outer peripheral portion CF1 in the lateral direction without point contact and the first communication port RA is formed.

そして、前記筒本体１６は下部の大径部と上部の外形が円錐台形状を呈する小径部とを備えており、本実施形態では、平面視円形状を呈する前記上水平壁１６Ｆの中心を通る縦断面である図９に示すように、対向する前記凸部１６Ｔの前記頂部の上方への延長線同志が交わってできる角度は、本実施形態では６０度（５０度以上から７０度以下が望ましい。）とする。これにより、前述した如く、前記弁体２２の上半球の上下方向における1／２の位置において、前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部１６Ｔの前記頂部と点接触することとなる。 The cylinder body 16 includes a large diameter portion at the lower portion and a small diameter portion having a truncated cone shape at the upper portion, and in the present embodiment, passes through the center of the upper horizontal wall 16F having a circular shape in a plan view. As shown in FIG. 9, which is a vertical cross section, the angle formed by the intersection of the extension lines of the opposing convex portions 16T upward above the top is 60 degrees (preferably 50 degrees or more to 70 degrees or less) in the present embodiment. .). As a result, as described above, at the position of 1/2 of the upper hemisphere of the valve body 22 in the vertical direction, the outer peripheral CF of the valve body 22 in the lateral direction makes point contact with the top of the convex portion 16T having a plurality of rows. Will be done.

なお、対向する前記凸部１６Ｔの前記頂部の上方への延長線同志が交わってできる角度は前記凸部１６Ｔの高さは全ての位置において同じである。また、前記上水平壁１６Ｆの中心を通って縦断面したときの前記第２空間Ｓ２の形状は台形状を呈しており、この台形の斜辺の上方への延長線同志が交わる角度も、本実施形態では６０度であるが、これに限らず、５０度以上から７０度以下が望ましく、前記第２空間Ｓ２は円錐台形状を呈していればよい。 The angle formed by the intersection of the upward extension lines of the convex portions 16T facing each other is the same at all positions at the height of the convex portions 16T. Further, the shape of the second space S2 when vertically crossed through the center of the upper horizontal wall 16F has a trapezoidal shape, and the angle at which the extension lines upward of the hypotenuse of the trapezoid intersect with each other is also the present implementation. The form is 60 degrees, but the degree is not limited to this, and it is preferably 50 degrees or more and 70 degrees or less, and the second space S2 may have a truncated cone shape.

ここで、図８乃至図１１について詳述すると、前記昇降部材２３の前記大径部２３Ａの外径は前記筒本体１６の前記第１側壁１６Ｃにより形成される前記第１空間Ｓ１の径より僅か小さく、この第１空間Ｓ１内を前記昇降部材２３が上下に移動可能である。また、前記スプリング１７の付勢力により前記昇降部材２３は上昇され、前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部１６Ｔの前記頂部と点接触するように押圧されるが、前記昇降部材２３の前記大径部２３Ａと前記小径部２３Ｂとの段差壁２３Ｅ及び前記小径部２３Ｂの側壁２３Ｆは前記筒本体１６の前記下水平壁１６Ｄ及び前記第２側壁１６Ｅとは接触しないで、僅かの隙間を有する。 Here, with reference to FIGS. 8 to 11, the outer diameter of the large diameter portion 23A of the elevating member 23 is slightly smaller than the diameter of the first space S1 formed by the first side wall 16C of the cylinder body 16. It is small and the elevating member 23 can move up and down in the first space S1. Further, the elevating member 23 is raised by the urging force of the spring 17, and the outer peripheral CF of the valve body 22 in the horizontal direction is pressed so as to make point contact with the top of the convex portion 16T having a plurality of rows. The step wall 23E between the large diameter portion 23A and the small diameter portion 23B of the elevating member 23 and the side wall 23F of the small diameter portion 23B do not come into contact with the lower horizontal wall 16D and the second side wall 16E of the cylinder body 16. , Has a slight gap.

なお、前記筒本体１６の前記第１側壁１６Ｃの内面と前記昇降部材２３の前記大径部２３Ａの側壁２３Ｇの外面との間には隙間３５が形成され、また前記側壁２３Ｇの表面上には外方向に突出した凸部２３Ｔが上下方向に延びて形成されが、前記凸部２３Ｔと前記第１側壁１６Ｃの内面との間にも隙間が形成される。従って、前記昇降部材２３が昇降する際に、前記第１側壁１６Ｃと前記凸部２３Ｔとが接触しても、その接触面積が少なく、前記昇降部材２３は円滑に昇降できる。なお、前記側壁２３Ｇの下端部には所定間隔を存して複数の切除部２３Ｈが形成される。 A gap 35 is formed between the inner surface of the first side wall 16C of the cylinder body 16 and the outer surface of the side wall 23G of the large diameter portion 23A of the elevating member 23, and a gap 35 is formed on the surface of the side wall 23G. The convex portion 23T protruding outward is formed so as to extend in the vertical direction, and a gap is also formed between the convex portion 23T and the inner surface of the first side wall 16C. Therefore, even if the first side wall 16C and the convex portion 23T come into contact with each other when the elevating member 23 moves up and down, the contact area is small and the elevating member 23 can move up and down smoothly. A plurality of excised portions 23H are formed at the lower end portion of the side wall 23G with a predetermined interval.

従って、前記スプリング１７の付勢力により前記昇降部材２３及び前記弁体２２が上昇して、前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部１６Ｔの前記頂部と点接触して、前記燃料タンク１００内の圧力が大気圧の状態又は後述する５ｋＰａ以上になるまでの正圧の状態では、前記弁部ＶＡの面積の大きさにより設定された第１通路抵抗（前記弁部ＶＡを流体（気化ガスや前記燃料）が通過するときの抵抗）が大きいために、前記点接触が解除しない。このため、前記燃料タンク１００内の圧力が大気圧以下では、前記第１空間Ｓ１は前記第１空気通路１５を介して前記開口Ｓ３とは連通していても、前述した５ｋＰａ以上になるまでの正圧の状態では、前記弁部ＶＡではその上方と下方との間の前記流体の行き来がない。 Therefore, the elevating member 23 and the valve body 22 are raised by the urging force of the spring 17, and the lateral outer peripheral CF of the valve body 22 comes into point contact with the top of the convex portion 16T having a plurality of rows. In the state where the pressure in the fuel tank 100 is atmospheric pressure or the positive pressure until it becomes 5 kPa or more, which will be described later, the first passage resistance (the valve portion VA) set by the size of the area of the valve portion VA. Because the fluid (resistance when the vaporized gas or the fuel) passes through is large, the point contact is not released. Therefore , when the pressure in the fuel tank 100 is atmospheric pressure or less, even if the first space S1 communicates with the opening S3 via the first air passage 15 , it reaches 5 kPa or more as described above. In the state of positive pressure, there is no movement of the fluid between the upper part and the lower part of the valve portion VA.

なお、（１−１）の実施形態における５ｋＰａは、前記弁部ＶＡの面積の大きさにより設定された前記第１通路抵抗と、前記弁体２２と前記昇降部材２３との合計重量以上の前記スプリング１７の付勢力の大きさとにより設定された圧力値である。 In addition, 5 kPa in the embodiment of (1-1) is the total weight of the first passage resistance set by the size of the area of the valve portion VA, the valve body 22, and the elevating member 23 or more. It is a pressure value set by the magnitude of the urging force of the spring 17.

そして、外気温の上昇に伴い、前記燃料タンク１００内の燃料が蒸発すると、前記給油口キャップ１０内の圧力が上昇して前記筒本体１６の下面開口より流入する圧力も前記燃料タンク１００の内圧と同じとなって、前述したような設定した所定の圧力値以上になるまでは、自身の下面開口より前記筒本体１６内に流入する圧力を前記給油口キャップ１０の外部に放出せずに、前記筒本体１６内と前記燃料タンク１００内とは同じ圧力となる。 When the fuel in the fuel tank 100 evaporates as the outside temperature rises, the pressure inside the fuel filler cap 10 rises and the pressure flowing in from the lower surface opening of the cylinder body 16 also becomes the internal pressure of the fuel tank 100. The same applies to the above, and the pressure flowing into the cylinder body 16 from its own lower surface opening is not released to the outside of the fuel filler cap 10 until the pressure value exceeds the set predetermined pressure value as described above. The pressure inside the cylinder body 16 and the pressure inside the fuel tank 100 are the same.

なお、前述したように、前記弁部ＶＡの面積の大小により、前記第１通路抵抗を設定し、前記スプリング１７の付勢力の大きさとの組み合わせにより、前記弁体２２の前記横方向の外周ＣＦと複数条の前記凸部１６Ｔとの点接触を解除するという前記弁部ＶＡの開放圧力を設定できる。本実施形態においては、前記開放圧力を前述したように、例えば５ｋＰａに設定し、前記弁部ＶＡの面積は極めて小さく、例えば０．００２ｍｍ2以上〜０．０２ｍｍ2以下とし、前記第１通路抵抗を大きく設定しており、後述する弁部ＶＢ等の面積も極めて小さく、同様のサイズである。 As described above, the first passage resistance is set according to the size of the area of the valve portion VA, and the outer peripheral CF of the valve body 22 in the lateral direction is combined with the magnitude of the urging force of the spring 17. It is possible to set the opening pressure of the valve portion VA to release the point contact between the valve portion VA and the convex portion 16T of the plurality of rows . In the present embodiment, the opening pressure as described above, for example, set to 5 kPa, the area of the valve portion VA is extremely small, for example, 0.002mm and more ～0.02Mm 2 or less, the first flow resistance Is set large, and the area of the valve portion VB and the like, which will be described later, is also extremely small, and has the same size.

また、前記スプリング１７の付勢力が大きすぎると、前記燃料タンク１００内の負圧もかなり大きくなければ、前記昇降部材２３及び前記弁体２２を下降させることができないので、前記スプリング１７の付勢力は前記昇降部材２３と前記弁体２２との合計した重量の１．０倍以上、例えば１．１以上〜２．０倍以下とし、前記スプリング１７は前記弁体２２と前記昇降部材２３とを押し上げて、前記弁体２２の前記横方向の外周ＣＦを前記第２側壁１６Ｅに形成された複数条の前記凸部１６Ｔの前記頂部に軽く押圧させて点接触させる小さな付勢力を有すれば足りる。 Further, if the urging force of the spring 17 is too large, the elevating member 23 and the valve body 22 cannot be lowered unless the negative pressure in the fuel tank 100 is also considerably large, so that the urging force of the spring 17 is not large. Is 1.0 times or more, for example, 1.1 or more to 2.0 times or less the total weight of the elevating member 23 and the valve body 22, and the spring 17 holds the valve body 22 and the elevating member 23. It suffices to have a small urging force that pushes up and lightly presses the outer peripheral CF of the valve body 22 in the lateral direction against the tops of the plurality of protrusions 16T formed on the second side wall 16E to make point contact. ..

即ち、自然落下式のエンジンでは、前述したように、前記スプリング１７の付勢力は前記昇降部材２３と前記弁体２２との合計した重量の、例えば１．１倍程度であって、燃料供給ポンプ式エンジンでは、例えば２．０倍程度である。 That is, in the naturally falling engine, as described above, the urging force of the spring 17 is, for example, about 1.1 times the total weight of the elevating member 23 and the valve body 22, and the fuel supply pump. In the type engine, for example, it is about 2.0 times.

そして、外気温度が上昇して、前記燃料タンク１００内の前記燃料が気化して発生したガス（Ｖｏｌａｔｉｌｅ Ｏｒｇａｎｉｃ Ｃｏｍｐｏｕｎｄｓ Ｇａｓで、「ＶＯＣガス」と略す。）又は前記燃料タンク１００内が前記燃料の満タン状態かこれに近い状態下で膨張した前記燃料の流体圧力が、例えば５ｋＰａ未満であれば、前記ＶＯＣガス又は前記燃料が前記スプリング３３の前記開口３３Ｂを介して前記筒本体１６と前記昇降部材２３との前記隙間３５内に流入したときに、前記昇降部材２３内にも流入して前記昇降部材２３内の圧力を高めて、前記スプリング１７の付勢力と相俟って、前記昇降部材２３及び前記弁体２２を押し上げて、前記弁体２２の前記横方向の外周ＣＦを複数条の前記凸部１６Ｔの前記頂部に点接触して前記通路抵抗により前記第１空間Ｓ１内の前記ＶＯＣガス又は前記燃料は前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００の外部、即ち前記給油口キャップ１０の外部へと流れない。 Then, the outside air temperature rises, and the gas generated by vaporizing the fuel in the fuel tank 100 (abbreviated as "VOC gas" in Volatile Organic Compounds Gas) or the inside of the fuel tank 100 is filled with the fuel. If the fluid pressure of the fuel expanded in a tongue or near state is less than, for example, 5 kPa, the VOC gas or the fuel passes through the opening 33B of the spring 33 to the cylinder body 16 and the elevating member. When it flows into the gap 35 with the elevating member 23, it also flows into the elevating member 23 to increase the pressure in the elevating member 23, and in combination with the urging force of the spring 17, the elevating member 23 And the valve body 22 is pushed up, the outer peripheral CF of the valve body 22 in the lateral direction is in point contact with the top of the convex portion 16T of a plurality of strips , and the VOC gas in the first space S1 is caused by the passage resistance. Alternatively, the fuel does not flow to the outside of the fuel tank 100, that is, to the outside of the fuel filler port cap 10 through the second space S2 and the opening S3.

しかし、前記筒本体１６内は前記開口Ｓ３を介して、即ち前記弁部ＶＡを構成する前記第１連通口ＲＡを介して外気に連通しており、前記筒本体１６内の空間が密閉状態ではなく、前記筒本体１６と前記昇降部材２３との前記隙間３５を介して前記第２空間Ｓ２内に流入した前記ＶＯＣガス又は前記燃料タンク１００内が前記燃料の満タン状態かこれに近い状態下で膨張した前記燃料の流体圧力が、例えば５ｋＰａに達すると、前記弁部ＶＡの下方の前記第２空間Ｓ２内に流入した前記ＶＯＣガス又は前記燃料は前記第１通路抵抗に抗して前記第１空気通路１５内を斜め上方に向けて上昇しながら前記弁部ＶＡを通過して、斜め上方へ向けて上昇する。そして、前記開口Ｓ３を介して前記給油口キャップ１０外部に放出されるが、この放出の際の圧力により前記スプリング１７の付勢力に抗して前記弁体２２及び前記昇降部材２３を円錐台形状の前記第２空間Ｓ２内で斜め上方から下方へ下降させ、前記弁体２２の前記横方向の外周ＣＦと複数条の前記凸部１６Ｔとの点接触を解除し、前記弁部ＶＡを開放する。 However, the inside of the cylinder body 16 communicates with the outside air through the opening S3, that is, through the first communication port RA constituting the valve portion VA, and the space inside the cylinder body 16 is sealed. The VOC gas or the fuel tank 100 that has flowed into the second space S2 through the gap 35 between the cylinder body 16 and the elevating member 23 is in a state where the fuel is full or close to it. When the fluid pressure of the fuel expanded in the above reaches , for example, 5 kPa, the VOC gas or the fuel flowing into the second space S2 below the valve portion VA will resist the first passage resistance and the first passage resistance . 1 Passing through the valve portion VA while ascending diagonally upward in the air passage 15, and ascending diagonally upward. Then, it is discharged to the outside of the fuel filler port cap 10 through the opening S3, and the valve body 22 and the elevating member 23 have a truncated cone shape against the urging force of the spring 17 due to the pressure at the time of this discharge. In the second space S2, the valve body 22 is lowered from diagonally above to downward to release the point contact between the lateral outer peripheral CF of the valve body 22 and the plurality of convex portions 16T, and the valve portion VA is opened. ..

従って、前記給油口キャップ１０が前記燃料タンク１００に取付けられたときに、前記燃料タンク１００内の圧力が高まることによって、例えば５ｋＰａに達することによって、前記昇降部材２３及び前記弁体２２が下降するまで、この前記燃料タンク１００内の圧力を前記燃料タンク１００外に放出しない。 Therefore, when the fuel filler port cap 10 is attached to the fuel tank 100, the elevating member 23 and the valve body 22 are lowered by increasing the pressure in the fuel tank 100, for example, reaching 5 kPa. Until then, the pressure inside the fuel tank 100 is not released to the outside of the fuel tank 100.

なお、本実施形態において、前記外蓋１２、前記内蓋１３、前記昇降部材２３は、ガソリン、軽油、エタノール、メタノール等の溶剤である燃料に対して耐溶剤性のある合成樹脂材料であるナイロン６又はナイロン６６により作製する。 In the present embodiment, the outer lid 12, the inner lid 13, and the elevating member 23 are nylon, which is a synthetic resin material having solvent resistance to fuels such as gasoline, light oil, ethanol, and methanol. Made of 6 or nylon 66.

そして、前述したように、前記スプリング３３により、前記キャップ本体１４が前記燃料タンク１００の前記給油口９８に取付けられると、リング状のガスケット３６が前記給油口９８に当接し、これにより前記給油口９８は前記キャップ本体１４にて閉塞される（図８参照）。 Then, as described above, when the cap body 14 is attached to the fuel filler port 98 of the fuel tank 100 by the spring 33, the ring-shaped gasket 36 comes into contact with the fuel filler port 98, thereby causing the fuel filler port 98. 98 is closed by the cap body 14 (see FIG. 8).

なお、図４において、前記フィルター３８は、耐油性に優れる活性炭フィルターや、ウレタン合成樹脂製のフィルター等の多孔質のフィルターで、前記大気を濾過して前記大気中のゴミなどの異物を捕集して前記燃料タンク１００内に入り込むのを阻止する。該フィルター３８を前記内蓋１３の前記筒本体１６の周囲の空間１３Ｓ内に収納させた状態で、前記外蓋１２内に前記内蓋１３を収納して、前記外蓋１２と前記内蓋１３とを固定する。即ち、前記フィルター３８の中央部に開設された中抜き部３８Ａに、前記筒本体１６を挿入させるようにして、前記フィルター３８を前記内蓋１３内の前記空間１３Ｓ内に収納させ、前記外蓋１２と前記内蓋１３とを固定する。 In FIG. 4, the filter 38 is a porous filter such as an activated carbon filter having excellent oil resistance or a filter made of urethane synthetic resin, which filters the atmosphere and collects foreign substances such as dust in the atmosphere. Then, it is prevented from entering the fuel tank 100. In a state where the filter 38 is housed in the space 13S around the cylinder body 16 of the inner lid 13, the inner lid 13 is housed in the outer lid 12, and the outer lid 12 and the inner lid 13 are stored. And fix. That is, the filter 38 is housed in the space 13S in the inner lid 13 by inserting the cylinder main body 16 into the hollow portion 38A opened in the central portion of the filter 38, and the outer lid. 12 and the inner lid 13 are fixed.

この場合、前記内蓋１３の周縁部の上壁１３Ｂにはリング状の凸部３９が二重に突設され、該凸部３９側から前記外蓋１２内に前記内蓋１３が収納され、一方前記外蓋１２の上壁１２Ｂの裏面側に溶着用リブ１２Ｄが所定間隔毎に２条突設され、各溶着用リブ１２Ｄと各凸部３９とが超音波によって溶着固定される。 In this case, a ring-shaped convex portion 39 is doubly projected on the upper wall 13B of the peripheral edge portion of the inner lid 13, and the inner lid 13 is housed in the outer lid 12 from the convex portion 39 side. On the other hand, two welding ribs 12D are projected on the back surface side of the upper wall 12B of the outer lid 12 at predetermined intervals, and each welding rib 12D and each convex portion 39 are welded and fixed by ultrasonic waves.

また、前記内蓋１３が前記外蓋１２内に収納された状態において、前記外蓋１２の前記側壁１２Ｃの前記内側面と前記内蓋１３の側壁１３Ｃの外側面との間に隙間４０が形成されている（図８、図１２参照）。前記隙間４０の下端は開口され、前記給油口キャップ１０外部の前記大気に（前記自動車１０１の外部に）連通する通気口となっている。 Further, in a state where the inner lid 13 is housed in the outer lid 12, a gap 40 is formed between the inner side surface of the side wall 12C of the outer lid 12 and the outer surface of the side wall 13C of the inner lid 13. (See FIGS. 8 and 12). The lower end of the gap 40 is opened to serve as a vent that communicates with the atmosphere outside the fuel filler cap 10 (outside the automobile 101).

そして、図５及び図６において、前記内蓋１３の上面の前記各凸部３９には所定間隔を存して複数の溝４１が形成されているが、前記外蓋１２に設けた複数の前記溶着用リブ１２Ｄは前記内蓋１３の前記各凸部３９に設けた前記溝４１に対向する位置を避けて（間隔ＩＮを置いて）設けていない。これにより、前記外蓋１２と前記内蓋１３とが超音波によって溶着固定された際に、前記溶着用リブ１２Ｄによって、各前記各凸部３９に設けた前記溝４１が塞がれないように構成されている。 Then, in FIGS. 5 and 6, a plurality of grooves 41 are formed in the convex portions 39 on the upper surface of the inner lid 13 at predetermined intervals, but the plurality of said portions provided on the outer lid 12 are formed. The welding rib 12D is not provided (with a gap IN) so as to avoid a position facing the groove 41 provided in each of the convex portions 39 of the inner lid 13. As a result, when the outer lid 12 and the inner lid 13 are welded and fixed by ultrasonic waves, the groove 41 provided in each of the convex portions 39 is not blocked by the welding rib 12D. It is configured.

従って、前記外蓋１２と前記内蓋１３との間には空気通路４３が形成されて、外気が前記給油口キャップ１０を経て前記燃料タンク１００内に導入できる。また、発生した前記ＶＯＣガス又は膨張した前記燃料により前記燃料タンク１００内の圧力が高まり、前記昇降部材２３及び前記弁体２２を下降させる圧力になったときのみ、前記フィルター３８と前記外蓋１２の裏面との空間４４、前記空気通路４３や前記隙間４０を介して前記燃料タンク１００外に高まった前記圧力を放出できることとなる。 Therefore, an air passage 43 is formed between the outer lid 12 and the inner lid 13, and outside air can be introduced into the fuel tank 100 via the fuel filler port cap 10. Further, only when the pressure in the fuel tank 100 is increased by the generated VOC gas or the expanded fuel and the pressure is reached to lower the elevating member 23 and the valve body 22, the filter 38 and the outer lid 12 are used. The increased pressure can be released to the outside of the fuel tank 100 through the space 44 with the back surface of the fuel tank, the air passage 43, and the gap 40.

なお、前記昇降部材２３及び前記弁体２２を下降させるに至らない圧力では、前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部１６Ｔの前記頂部に点接触している状態が維持され、前記第１通路抵抗により前記第１空間Ｓ１内の前記ＶＯＣガス又は前記燃料は前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００外部、即ち前記給油口キャップ１０外部へ放出されない。 Incidentally, in the elevating member 23 and the pressure that does not lead to lowering the valve body 22, a state where the lateral direction of the outer peripheral CF of the valve body 22 is in point contact with the top portion of the convex portion 16T of the plural rows It is maintained, and the VOC gas or the fuel in the first space S1 is discharged to the outside of the fuel tank 100, that is, the outside of the fuel filler cap 10 through the second space S2 and the opening S3 by the first passage resistance. Not done.

従って、前記弁機構部は前記筒本体１６と、前記昇降部材２３、前記スプリング１７及び前記弁体２２とから構成され、安全弁としての機能を果たすこととなる。 Therefore, the valve mechanism portion is composed of the cylinder body 16, the elevating member 23, the spring 17, and the valve body 22, and functions as a safety valve.

以上の構成により、次に前記給油口キャップ１０の組み立てについて、説明する。尚、前記フィルター３８の前記中抜き部３８Ａに前記内蓋１３の前記筒本体１６を挿入させた状態で、前記外蓋１２内に前記内蓋１３を収納させ、また前記外蓋１２の前記各溶着用リブ１２Ｄと前記内蓋１３の前記各凸部３９とが超音波によって溶着固定され、前記内蓋１３と前記外蓋１２とは固定されているものとする。 With the above configuration, the assembly of the fuel filler port cap 10 will be described next. In the state where the cylinder body 16 of the inner lid 13 is inserted into the hollow portion 38A of the filter 38, the inner lid 13 is housed in the outer lid 12, and each of the outer lids 12 is stored. It is assumed that the welding rib 12D and the convex portions 39 of the inner lid 13 are welded and fixed by ultrasonic waves, and the inner lid 13 and the outer lid 12 are fixed.

先ず、例えば前記昇降部材２３上に前記弁体２２を載置させた状態で、前記筒本体１６の空間内に前記昇降部材２３を収納する。すると、前記昇降部材２３の前記小径部２３Ｂが前記弁体２２を載置した状態で前記第２空間Ｓ２内に入り込むと共に、且つ前記大径部２３Ａが前記第１空間Ｓ１内に入り込むこととなる。 First, for example, the elevating member 23 is housed in the space of the cylinder body 16 with the valve body 22 placed on the elevating member 23. Then, the small diameter portion 23B of the elevating member 23 enters the second space S2 with the valve body 22 mounted on it, and the large diameter portion 23A enters the first space S1. ..

次に、前記昇降部材２３の前記空間２３Ｓ内に前記スプリング１７を収納し、前記内蓋１３の前記底壁１３Ａの前記固定孔１３Ｇと前記スプリング３３の前記固定孔３３Ａとに前記リベット３４を挿入することにより、前記底壁１３Ａに前記スプリング３３を固定する。 Next, the spring 17 is housed in the space 23S of the elevating member 23, and the rivet 34 is inserted into the fixing hole 13G of the bottom wall 13A of the inner lid 13 and the fixing hole 33A of the spring 33. By doing so, the spring 33 is fixed to the bottom wall 13A.

これにより、前記弁機構部を備えた前記給油口キャップ１０の組み立てが終了する。そして、このようにして組み立てられた前記給油口キャップ１０は、前記給油口９８に取り付けられて、利用されることとなる。 As a result, the assembly of the fuel filler port cap 10 provided with the valve mechanism is completed. Then, the refueling port cap 10 assembled in this way is attached to the refueling port 98 and used.

この状態では、前記スプリング１７がその付勢力により前記弁体２２と前記昇降部材２３とを押し上げて、前記弁体２２の前記横方向の外周ＣＦが前記筒本体１６の前記第２側壁１６Ｅの複数条の前記凸部１６Ｔの前記頂部と点接触する。このとき、前記弁部ＶＡに設定された前記第１通路抵抗が大きいために、前記第１通路抵抗により前記点接触が解除されない。 In this state, the spring 17 pushes up the valve body 22 and the elevating member 23 by its urging force, and the lateral outer peripheral CF of the valve body 22 is a plurality of the second side wall 16E of the cylinder body 16. Point contact with the top of the convex portion 16T of the strip. At this time, in order set the first passage resistance to the valve unit VA is large, the point contacted by the first flow resistance is not released.

次に、前記燃料タンク１００が概ね水平状態にあるときの前記給油口キャップ１０の作用について説明する。先ず、前記燃料タンク１００内に前記燃料を入れて、前記給油口９８に前記給油口キャップ１０を取り付けた直後では、前記燃料タンク１００の内部と外部の圧力が均衡している。従って、前記スプリング１７が前記弁体２２と前記昇降部材２３とを押し上げて、前記弁体２２の前記横方向の外周ＣＦが前記第２側壁１６Ｅの複数条の前記凸部１６Ｔと点接触して、前記第１通路抵抗により前記点接触が解除せず、前記第１空間Ｓ１と前記開口Ｓ３との間では前記流体の行き来はされない状態である。 Next, the operation of the fuel filler port cap 10 when the fuel tank 100 is in a substantially horizontal state will be described. First, immediately after the fuel is put into the fuel tank 100 and the fuel filler cap 10 is attached to the fuel filler port 98, the pressure inside and outside the fuel tank 100 is in equilibrium. Therefore, the spring 17 pushes up the valve body 22 and the elevating member 23, and the lateral outer peripheral CF of the valve body 22 comes into point contact with the convex portions 16T of the plurality of rows of the second side wall 16E. the first by passage resistance without releasing said point contact, a state which is not in traverse of the fluid between the opening S3 and the first space S1.

即ち、前記隙間４０、前記空気通路４３、前記空間４４、前記空間１２Ｓ、前記開口Ｓ３を介する前記給油口キャップ１０外部の外気は、前記弁体２２の前記横方向の外周ＣＦが前記第２側壁１６Ｅの複数条の前記凸部１６Ｔと点接触した状態であり、前記第１通路抵抗により前記開口Ｓ３、前記第２空間Ｓ２を介して前記第１空間Ｓ１内への流入は阻止されている。 That is, in the outside air outside the fuel filler port cap 10 through the gap 40, the air passage 43, the space 44, the space 12S, and the opening S3, the outer peripheral CF in the lateral direction of the valve body 22 is the second side wall. It is in a state of point contact with the convex portions 16T of the plurality of rows of 16E, and the inflow into the first space S1 through the opening S3 and the second space S2 is blocked by the first passage resistance . ..

また、前記スプリング３３の前記開口３３Ｂ、前記筒本体１６の前記第１空間Ｓ１、前記筒本体１６と前記昇降部材２３との前記隙間３５を介する前記燃料タンク１００内の前記ＶＯＣガス又は前記燃料は、前記第１通路抵抗により前記開口Ｓ３を介して前記燃料タンク１００外部、即ち前記給油口キャップ１０外部へ放出されない。 Further, the VOC gas or the fuel in the fuel tank 100 through the opening 33B of the spring 33, the first space S1 of the cylinder body 16, and the gap 35 between the cylinder body 16 and the elevating member 23 Due to the first passage resistance, the fuel is not discharged to the outside of the fuel tank 100, that is, to the outside of the fuel filler port cap 10 through the opening S3.

次に、前記エンジン９９の停止中において、外気温度が上昇すると、前記燃料タンク１００内の前記燃料が蒸発して有害な前記ＶＯＣガスが発生したり、前記燃料タンク１００内が前記燃料の満タン状態かこれに近い状態下で前記燃料が膨張して、前記燃料タンク１００内の内圧が高まる。しかし、前記燃料タンク１００内の前記内圧が、例えば５ｋＰａ未満であれば、前記弁体２２の前記横方向の外周ＣＦが前記凸部１６Ｔの前記頂部に前記スプリング１７の付勢力により押圧して点接触した状態であり、前記第１通路抵抗により前記第１空間Ｓ１内の前記ＶＯＣガス又は前記燃料は前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００外部、即ち前記給油口キャップ１０外部へ放出されない。 Next, when the outside air temperature rises while the engine 99 is stopped, the fuel in the fuel tank 100 evaporates to generate harmful VOC gas, or the fuel tank 100 is filled with the fuel. The fuel expands in a state or a state close to this, and the internal pressure in the fuel tank 100 increases. However, if the internal pressure in the fuel tank 100 is less than, for example, 5 kPa, the lateral outer peripheral CF of the valve body 22 presses against the top of the convex portion 16T by the urging force of the spring 17. In a state of contact, the VOC gas or the fuel in the first space S1 is sent to the outside of the fuel tank 100 through the second space S2 and the opening S3 due to the first passage resistance, that is , the fuel filler port cap. 10 Not released to the outside.

従って、前記燃料タンク１００内の前記燃料が蒸発して前記ＶＯＣガスが発生しても、また前記燃料が膨張しても、前述したように、前記ＶＯＣガス又は前記燃料が前記自動車１０１外部へ放出されることが抑制される。このため、前記燃料から蒸発した有害な前記ＶＯＣガス又は前記燃料を前記自動車１０１外部に放出させないので、環境汚染を防止できる。 Therefore, even if the fuel in the fuel tank 100 evaporates to generate the VOC gas or the fuel expands, the VOC gas or the fuel is released to the outside of the automobile 101 as described above. Is suppressed. Therefore, the harmful VOC gas evaporated from the fuel or the fuel is not released to the outside of the automobile 101, so that environmental pollution can be prevented.

そして、前記エンジン９９の停止中において、外気温度の更なる上昇に伴い、前記燃料タンク１００内の前記燃料が蒸発することによる前記ＶＯＣガスの発生量が更に増大して、又は前記燃料タンク１００内が前記燃料の満タン状態かこれに近い状態下で前記燃料が膨張して、前記燃料タンク１００内の圧力が更に高まって、例えば５ｋＰａに達すると、前記第２側壁１６Ｅの各凸部１６Ｔ間に形成された前記第１空気通路１５内を高圧の前記ＶＯＣガス又は膨張した前記燃料が前記弁部ＶＡの面積の大きさにより設定された前記第１通路抵抗に抗して斜め上方に向けて上昇して、前記弁体２２の前記横方向の外周ＣＦが前記凸部１６Ｔと点接触している前記弁部ＶＡを通過する前記ＶＯＣガス又は前記燃料が円錐台形状の前記第２空間Ｓ２内で斜め上方から下方へ前記弁体２２を押し下げるように作用する。 Then, while the engine 99 is stopped, the amount of VOC gas generated due to the fuel in the fuel tank 100 evaporating with the further rise in the outside air temperature is further increased, or in the fuel tank 100. When the fuel expands and the pressure in the fuel tank 100 further increases, for example, reaches 5 kPa when the fuel is full or close to the full tank, between the convex portions 16T of the second side wall 16E. The high-pressure VOC gas or the expanded fuel in the first air passage 15 formed in the above is directed diagonally upward against the first passage resistance set by the size of the area of the valve portion VA. It rises and the valve body 22 the transverse direction of the outer peripheral CF is the VOC gas or the fuel within the second space S2 frustoconical passing through the valve unit VA in contact the convex portion 16T and the point of in acting so obliquely from above downward pushing down the valve body 22.

従って、前記ＶＯＣガス又は前記燃料により、前記スプリング１７の付勢力に抗して前記弁体２２及び前記昇降部材２３が下降され、前記弁体２２の前記横方向の外周ＣＦと複数条の前記凸部１６Ｔとの点接触を解除し、前記弁部ＶＡを開放する（図１０参照）。 Therefore, the valve body 22 and the elevating member 23 are lowered by the VOC gas or the fuel against the urging force of the spring 17, and the outer peripheral CF of the valve body 22 in the lateral direction and the plurality of protrusions. The point contact with the portion 16T is released, and the valve portion VA is opened (see FIG. 10).

このため、前記燃料タンク１００内の圧力が、５ｋＰａに達して、上述したように、前記弁部ＶＡを開放すると、前記燃料タンク１００内の過大な圧力（前記ＶＯＣガスや前記燃料を含む。）は、前記開口３３Ｂ、前記第１空間Ｓ１（前記隙間３５）、前記第２空間Ｓ２（前記第１空気通路１５を含む。）、前記開口Ｓ３、前記空間１２Ｓ、前記空間４４、前記空気通路４３、前記隙間４０を介して、前記給油口キャップ１０の外部、即ち前記自動車１０１外部に放出されることとなる。 Therefore, when the pressure in the fuel tank 100 reaches 5 kPa and the valve portion VA is opened as described above, the excessive pressure in the fuel tank 100 (including the VOC gas and the fuel). 33B, the first space S1 (the gap 35), the second space S2 (including the first air passage 15), the opening S3, the space 12S, the space 44, and the air passage 43. The fuel is discharged to the outside of the fuel filler port cap 10, that is, to the outside of the automobile 101 through the gap 40.

すると、この放出により前記燃料タンク１００の内の圧力は直ちに５ｋＰａ未満の圧力の状態になって、図８や図９に示すような状態となり、前記弁機構部は安全弁としての機能を有する。即ち、前述したように、前記スプリング１７の付勢力により前記昇降部材２３及び前記弁体２２が上昇して、前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部１６Ｔの前記頂部と点接触して、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Then, due to this release, the pressure inside the fuel tank 100 immediately becomes a pressure of less than 5 kPa, and becomes a state as shown in FIGS . 8 and 9, and the valve mechanism portion has a function as a safety valve. That is, as described above, the elevating member 23 and the valve body 22 are raised by the urging force of the spring 17, and the outer peripheral CF of the valve body 22 in the lateral direction is the top portion of the convex portion 16T having a plurality of rows. contact preparative point, the valve mechanism part has a function as a safety valve, it is possible to prevent contamination of the environment it is possible to improve the fuel economy.

以上のように、前記燃料タンク１００内の圧力が設定した圧力値まで上昇した際に、前記第１空間Ｓ１内の前記ＶＯＣガス又は前記燃料が前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００外部、即ち前記給油口キャップ１０外部へ放出させるようにしたのは、このようにしないと、前記給油口キャップ１０を前記自動車１０１から外した際に、前記燃料タンク１００内の圧力によって燃料が自動車１０１外部に飛び散ることとなって危険であるからであり、前記弁機構部は安全弁としての機能を果たす。 As described above, when the pressure in the fuel tank 100 rises to a set pressure value, the VOC gas or the fuel in the first space S1 passes through the second space S2 and the opening S3. The reason why the fuel tank 100 is discharged to the outside, that is, to the outside of the fuel tank cap 10 is that, otherwise, when the fuel tank cap 10 is removed from the automobile 101, the pressure inside the fuel tank 100 causes the fuel to be discharged. This is because it is dangerous because the fuel is scattered to the outside of the automobile 101, and the valve mechanism portion functions as a safety valve.

次に、前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部１６Ｔの前記頂部と点接触している状態において、前記自動車１０１の前記エンジン９９の駆動による前記燃料の消費により前記燃料タンク１００内の圧力が負圧になったときについて、以下説明する。 Then, in a state in which the lateral periphery CF of the valve body 22 is in contact the top and the point of the convex portion 16T of the plural rows, said the consumption of the fuel by driving of the engine 99 of the automobile 101 The case where the pressure in the fuel tank 100 becomes negative will be described below.

前記燃料の消費により前記燃料タンク１００内が負圧に変わると、前記スプリング３３の前記開口３３Ｂを介して前記昇降部材２３内も負圧となり、前記スプリング１７の付勢力に抗して前記昇降部材２３が下降するため、前記弁体２２も下降し、前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部１６Ｔの前記頂部と点接触している状態が解除され、前記弁部ＶＡが開放する。 When the inside of the fuel tank 100 changes to a negative pressure due to the consumption of the fuel, the inside of the elevating member 23 also becomes a negative pressure through the opening 33B of the spring 33, and the elevating member resists the urging force of the spring 17. Since the 23 is lowered, the valve body 22 is also lowered, and the state in which the lateral outer peripheral CF of the valve body 22 is in point contact with the top of the convex portion 16T having a plurality of rows is released, and the valve portion is released. VA opens .

すると、前記開口Ｓ３と前記第１空間Ｓ１との間で前記大気が移動して、前記大気が前記隙間４０、前記空気通路４３、前記空間４４、前記空間１２Ｓ、前記開口Ｓ３、前記第２空間Ｓ２（前記第１空気通路１５を含む。）、前記第１空間Ｓ１（前記隙間３５）、前記開口３３Ｂを介して、前記燃料タンク１００内に流入し、前記エンジン９９への前記燃料の供給を行う。 Then, the atmosphere moves between the opening S3 and the first space S1, and the atmosphere moves into the gap 40, the air passage 43, the space 44, the space 12S, the opening S3, and the second space. The fuel flows into the fuel tank 100 through S2 (including the first air passage 15), the first space S1 (the gap 35), and the opening 33B, and supplies the fuel to the engine 99. Do.

従って、流入された前記燃料タンク１００内は大気圧状態となると、前記スプリング１７の付勢力により前記弁体２２及び前記昇降部材２３を上昇させて、前記開口Ｓ３、前記第２空間Ｓ２を介して前記第１空間Ｓ１へと前記大気の流入はなくなり、前記燃料の消費により、再び負圧の状態となると、流入し、以下同様な動作が繰り返されることとなる。上述したような、前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部１６Ｔの前記頂部と点接触している状態において、前記エンジン９９の駆動による前記燃料の消費により前記燃料タンク１００内の圧力が負圧になった場合の動作は、以下に説明する前記給油口キャップ１０や弁機構体６０に関する全ての実施形態において、同様に適用される。 Therefore, in the fuel tank 100 which is flowed when the atmospheric pressure, the raises the valve body 22 and the elevation member 23 by the urging force of the spring 17, the opening S3, through the second space S2 When the inflow of the atmosphere into the first space S1 is eliminated and the state of negative pressure is reached again due to the consumption of the fuel, the inflow occurs, and the same operation is repeated thereafter. As described above, in a state where the outer peripheral CF of the valve body 22 in the lateral direction is in point contact with the top of the convex portion 16T having a plurality of rows, the fuel tank is consumed by the fuel driven by the engine 99. The operation when the pressure in 100 becomes a negative pressure is similarly applied in all the embodiments relating to the fuel filler port cap 10 and the valve mechanism 60 described below.

なお、この前記給油口９８に前記給油口キャップ１０（前記キャップ本体１４）を取り付ける方法又は構造は、板バネから成る前記スプリング３３に限らず、ネジ式でもよく、特にその取付方法又は構造は問わず、以下前述したネジ式の実施形態について、説明する。 The method or structure for attaching the fuel filler cap 10 (cap body 14) to the fuel filler port 98 is not limited to the spring 33 made of a leaf spring, and may be a screw type, and the mounting method or structure thereof is particularly limited. First, the screw type embodiment described above will be described below.

先ず、図１２に示すように、前記内蓋１３下部に取付部材としての中空の外筒状部１３Ｄを形成し、連通路としての空間を有する前記外筒状部１３Ｄの内側面に雌ネジ部１３Ｅを形成して、前記給油口９８に形成した雄ネジ部と螺合することにより、前記給油口９８に前記給油口キャップ１０（前記キャップ本体１４）を取り付ける。 First, as shown in FIG. 12, a hollow outer tubular portion 13D as a mounting member is formed in the lower portion of the inner lid 13, and a female screw portion is formed on the inner surface of the outer tubular portion 13D having a space as a continuous passage. By forming 13E and screwing it with the male screw portion formed in the fuel filler port 98, the fuel filler port cap 10 (the cap body 14) is attached to the fuel filler port 98.

そして、前記外筒状部１３Ｄの内方に内筒状部１３Ｆを形成し、前記第１空間Ｓ１内に収納される前記昇降部材２３が落下しないように、キャップ１８の周縁部に形成された嵌合溝１８Ａに前記内筒状部１３Ｆを嵌合させる。これにより、前記内蓋１３に固定された前記キャップ１８が前記昇降部材２３を支持する前記スプリング１７を支持し、結果として前記昇降部材２３は落下しないように支持される。 Then, the inner tubular portion 13F is formed inside the outer tubular portion 13D, and is formed on the peripheral edge portion of the cap 18 so that the elevating member 23 housed in the first space S1 does not fall. The inner tubular portion 13F is fitted into the fitting groove 18A. As a result, the cap 18 fixed to the inner lid 13 supports the spring 17 that supports the elevating member 23, and as a result, the elevating member 23 is supported so as not to fall.

そして、前記キャップ１８の中央部に、前記第１空間Ｓ１に連通する空気通路１８Ｓが形成され、該空気通路１８Ｓの下部は前記燃料タンク１００内部と連通する。即ち、前記キャップ１８の下面に開設された溝１８Ｂ内には前記流体の波動防止用の蓋体１９が設けられるが、前記溝１８Ｂの下面開口は前記燃料タンク１００内部と連通する一部（流体吸排口）２０Ａを除いて前記蓋体１９により塞がれ、前記蓋体１９の上方には前記流体吸排口２０Ａに連通する流体通路２０Ｂ及び前記空気通路１８Ｓが形成される。 Then, an air passage 18S communicating with the first space S1 is formed in the central portion of the cap 18, and the lower portion of the air passage 18S communicates with the inside of the fuel tank 100. That is, a lid 19 for preventing the wave motion of the fluid is provided in the groove 18B formed on the lower surface of the cap 18, but the lower surface opening of the groove 18B is a part (fluid) communicating with the inside of the fuel tank 100. The suction / exhaust port) 20A is closed by the lid body 19, and a fluid passage 20B and an air passage 18S communicating with the fluid suction / exhaust port 20A are formed above the lid body 19.

２１は中央部が開口しているガスケットで、前記キャップ１８の前記嵌合溝１８Ａに前記内筒状部１３Ｆを嵌合させると、前記キャップ１８の外径が前記ガスケット２１の前記開口の内径より大径であるので、前記キャップ１８の折返し片１８Ｃにより抜けが防止される。そして、前記給油口９８に前記給油口キャップ１０を取り付ける際に、前記外筒状部１３Ｄの内壁面に形成された前記雌ネジ部１３Ｅに前記給油口９８に形成した雄ネジ部を螺合させると前記給油口９８の口金が前記ガスケット２１に当接し密閉される。 Reference numeral 21 denotes a gasket having an open central portion. When the inner tubular portion 13F is fitted into the fitting groove 18A of the cap 18, the outer diameter of the cap 18 is larger than the inner diameter of the opening of the gasket 21. Since the diameter is large, the folded piece 18C of the cap 18 prevents the cap 18 from coming off. Then, when the fuel filler cap 10 is attached to the fuel filler port 98, the male screw portion formed on the fuel filler port 98 is screwed into the female screw portion 13E formed on the inner wall surface of the outer tubular portion 13D. And the mouthpiece of the fuel filler port 98 abuts on the gasket 21 and is sealed.

（１−２）前記筒本体１６の第２の実施形態（前記弁部ＶＢ、図１３及び図１４参照）
次に、前記筒本体１６の第２の実施形態について、図１３及び図１４に基づいて説明するが、以後説明する全ての実施形態にも適用できるものである。前記筒本体１６の第１の実施形態は、前記第２側壁１６Ｅの前記内側面１６Ｅ１に上下方向に延びる数条の前記凸部１６Ｔを突出させて、各凸部１６Ｔ間に前記第１空気通路１５を形成する形態であった。 (1-2) A second embodiment of the cylinder body 16 (see the valve portion VB, FIGS. 13 and 14).
Next, the second embodiment of the cylinder body 16 will be described with reference to FIGS. 13 and 14, but can also be applied to all the embodiments described below. In the first embodiment of the cylinder body 16, several protrusions 16T extending in the vertical direction are projected from the inner side surface 16E1 of the second side wall 16E, and the first air passage is provided between the convex portions 16T. It was a form forming 15.

しかし、この第２の実施形態は、前記開口Ｓ３と前記第２空間Ｓ２とに連通する複数の第２空気通路１５Ａが前記筒本体１６の前記第２側壁１６Ｅに形成される形態である。詳述すると、前記第２側壁１６Ｅの前記内側面１６Ｅ１（前記第２空間Ｓ２を形成する内側面）に、所定の間隔を存して、上下方向に延びて、横断平面が、例えば三角形状の凹部（外方へ向けて凹ませて形成する。）を複数条（例えば、８個）形成して、前記第２空気通路１５Ａが形成される。即ち、前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１には、前記凹部である前記第２空気通路１５Ａと前記弁体２２が接触する前記第２側壁１６Ｅの前記内側面１６Ｅ１とが交互に形成されることとなる。 However, in this second embodiment, a plurality of second air passages 15A communicating with the opening S3 and the second space S2 are formed on the second side wall 16E of the cylinder body 16. More specifically, the inner side surface 16E1 (the inner side surface forming the second space S2) of the second side wall 16E extends in the vertical direction at a predetermined interval, and the cross-sectional plane has a triangular shape, for example. The second air passage 15A is formed by forming a plurality of (for example, eight) recesses (formed by denting outward). That is, the inner side surface 16E1 of the second side wall 16E of the cylinder body 16 has the inner side surface 16E1 of the second side wall 16E in which the second air passage 15A, which is the recess, and the valve body 22 come into contact with each other. It will be formed alternately.

なお、前述したように、前記上水平壁１６Ｆの中心を通って縦断面したときの前記空間Ｓ２の形状は台形状を呈しており、この台形の斜辺の上方への延長線同志が交わる角度は、例えば６０度であるが、前記第２空気通路１５Ａを形成する前記凹部の深さも全域に亘って同じ深さであるため、図１３に示すように、前記凹部の前記最深部の上方への延長線同志が交わってできる角度も６０度であるが、これに限らず、５０度以上から７０度以下が望ましく、前記空間Ｓ２は円錐台形状を呈していればよい。 As described above, the shape of the space S2 when vertically crossed through the center of the upper horizontal wall 16F has a trapezoidal shape, and the angle at which the upward extension lines of the trapezoidal side intersect is For example, although it is 60 degrees, since the depth of the recess forming the second air passage 15A is also the same over the entire area, as shown in FIG. 13, the depth of the recess is above the deepest portion. The angle formed by the intersection of the extension lines is also 60 degrees, but the angle is not limited to this, and is preferably 50 degrees or more and 70 degrees or less, and the space S2 may have a truncated cone shape.

また、この第２の実施形態における前記弁部ＶＢは、前記弁体２２の前述した前記横方向の外周ＣＦが前記第２側壁１６Ｅの前記内側面１６Ｅ１に押圧して線接触する部位間の前記弁体２２の線接触しない前記横方向の外周の部分ＣＦ２と、前記弁体２２の前記中心ＣＯと前記横方向の外周ＣＦとを結んでできた前記面ＣＳ（例えば、円錐面）を外方へ延長した前記面で前記第２空気通路１５Ａを形成する前記凹部を形成するための面を切断した前記第２空気通路１５Ａの切り口である第２連通口ＲＢとで構成される。従って、前述したように、線接触しない前記横方向の外周の部分ＣＦ２と前記第２連通口ＲＢとで構成される面積が極小さい前記弁部ＶＢが形成されることとなる。 Further, in the valve portion VB in the second embodiment, the valve body 22 is located between the portions where the lateral outer peripheral CF of the valve body 22 presses against the inner side surface 16E1 of the second side wall 16E to make line contact. The surface CS (for example, a conical surface) formed by connecting the lateral outer peripheral portion CF2 of the valve body 22 that does not make line contact with the central CO of the valve body 22 and the lateral outer peripheral CF is outward. It is composed of a second communication port RB which is a cut end of the second air passage 15A by cutting a surface for forming the recess forming the second air passage 15A on the surface extended to. Therefore, as described above, the valve portion VB having an extremely small area composed of the outer peripheral portion CF2 in the lateral direction without line contact and the second communication port RB is formed.

以上のように、構成することにより、前記筒本体１６の第２の実施形態の作用も第１の実施形態と同様であり、特に異なる作用のみ説明する。前記燃料タンク１００が概ね水平状態にあって、前記エンジン９９の停止中においては、前記燃料タンク１００内の前記内圧が高まっても、例えば５ｋＰａ未満であれば、前記弁体２２の前記横方向の外周ＣＦが前記第２側壁１６Ｅの前記内側面１６Ｅ１に前記スプリング１７の付勢力により押圧されて線接触した状態が維持され、前記弁部ＶＢの面積の大きさにより設定された第２通路抵抗（前記弁部ＶＢを前記流体が通過するときの抵抗）により前記第１空間Ｓ１内の前記ＶＯＣガス又は前記燃料は前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００外部、即ち前記給油口キャップ１０外部へ放出されない。 As described above, the operation of the second embodiment of the cylinder body 16 is the same as that of the first embodiment by the configuration, and only the different operations will be described. When the fuel tank 100 is in a substantially horizontal state and the engine 99 is stopped, even if the internal pressure in the fuel tank 100 increases, for example, if it is less than 5 kPa, the valve body 22 in the lateral direction The outer peripheral CF is pressed against the inner side surface 16E1 of the second side wall 16E by the urging force of the spring 17 to maintain a state of line contact, and the second passage resistance set by the size of the area of the valve portion VB ( Due to the resistance when the fluid passes through the valve portion VB), the VOC gas or the fuel in the first space S1 passes through the second space S2 and the opening S3 to the outside of the fuel tank 100, that is, the refueling. Mouth cap 10 Not released to the outside.

（１−２）の実施形態における５ｋＰａは、前記弁部ＶＢの面積の大きさにより設定された前記第２通路抵抗と、前記弁体２２と前記昇降部材２３との合計重量以上の前記スプリング１７の付勢力の大きさとにより設定された圧力値である。 5 kPa in the embodiment of (1-2) is the spring 17 which is equal to or larger than the total weight of the second passage resistance set by the size of the area of the valve portion VB and the valve body 22 and the elevating member 23. It is a pressure value set by the magnitude of the urging force of.

従って、前記燃料タンク１００内の前記燃料が蒸発して前記ＶＯＣガスが発生しても、また前記燃料が膨張しても、前述したように、前記ＶＯＣガス又は前記燃料が前記自動車１０１外部へ放出されることが抑制される。このため、前記燃料から蒸発した有害な前記ＶＯＣガス又は前記燃料を前記自動車１０１外部に放出させないので、環境汚染を防止できる。 Therefore, even if the fuel in the fuel tank 100 evaporates to generate the VOC gas or the fuel expands, the VOC gas or the fuel is released to the outside of the automobile 101 as described above. Is suppressed. Therefore, the harmful VOC gas evaporated from the fuel or the fuel is not released to the outside of the automobile 101, so that environmental pollution can be prevented.

そして、同じく前記エンジン９９の停止中において、前記燃料タンク１００内の圧力が、例えば５ｋＰａに達すると、前記第２側壁１６Ｅの前記第２空気通路１５Ａ内を高圧の前記ＶＯＣガス又は膨張した前記燃料が前記第２通路抵抗に抗して上昇して、前記弁体２２の前記横方向の外周ＣＦが前記第２側壁１６Ｅの前記内側面１６Ｅ１と線接触している前記弁部ＶＢを通過し、この斜め上方へ向けて上昇する前記ＶＯＣガス又は前記燃料が円錐台形状の前記第２空間Ｓ２内で斜め上方から下方へ前記弁体２２を押し下げるように作用し、前記スプリング１７の付勢力に抗して前記弁体２２及び前記昇降部材２３が下降され、前記弁体２２の前記横方向の外周ＣＦと前記内側面１６Ｅ１と線接触を解除し、前記弁部ＶＢを開放する。すると、前記燃料タンク１００内の過大な圧力（前記ＶＯＣガスや前記燃料を含む。）は、前記開口３３Ｂ、前記第１空間Ｓ１（前記隙間３５）、前記第２空間Ｓ２（前記第２空気通路１５Ａを含む。）、前記開口Ｓ３、前記空間１２Ｓ、前記空間４４、前記空気通路４３、前記隙間４０を介して、前記給油口キャップ１０を介して前記自動車１０１外部に放出されることとなる。 Similarly, when the pressure in the fuel tank 100 reaches, for example, 5 kPa while the engine 99 is stopped, the high-pressure VOC gas or the expanded fuel in the second air passage 15A of the second side wall 16E. Rises against the second passage resistance, and the lateral outer peripheral CF of the valve body 22 passes through the valve portion VB in line contact with the inner side surface 16E1 of the second side wall 16E . the VOC gas or the fuel acts to depress the valve body 22 downward from obliquely upwardly within the second space S2 of the frustoconical raised toward the obliquely upward, anti the biasing force of the spring 17 Then, the valve body 22 and the elevating member 23 are lowered to release the line contact between the lateral outer peripheral CF and the inner side surface 16E1 of the valve body 22 and open the valve portion VB. Then, the excessive pressure in the fuel tank 100 (including the VOC gas and the fuel) is applied to the opening 33B, the first space S1 (the gap 35), and the second space S2 (the second air passage). 15A is included), the opening S3, the space 12S, the space 44, the air passage 43, and the gap 40, and the fuel is discharged to the outside of the automobile 101 through the fuel filler cap 10.

すると、この放出により前記燃料タンク１００の内の圧力は直ちに５ｋＰａ未満の圧力の状態になって、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Then, the pressure of the fuel tank 100 is immediately ready for a pressure of less than 5 kPa, the valve mechanism part has a function as a safety valve, contamination of the environment it is possible to improve the fuel efficiency by the release Can be prevented.

なお、前記燃料の消費により前記燃料タンク１００内が負圧に変わったときの作用については、前述した前記筒本体１６の第１の実施形態の作用と同様であり、ここでは説明は省略する。 The action when the inside of the fuel tank 100 changes to a negative pressure due to the consumption of the fuel is the same as the action of the first embodiment of the cylinder body 16 described above, and the description thereof will be omitted here.

なお、前記筒本体１６の前記第１の実施形態及び第２の実施形態において、前記弁部ＶＡ又はＶＢの開放圧力を、例えば５ｋＰａに設定した場合において、前記燃料タンク１００が傾斜しても、前記燃料タンク１００内の圧力が５ｋＰａ未満であれば、前記弁部ＶＡ又はＶＢは開放しない。 In the first embodiment and the second embodiment of the cylinder body 16, even if the fuel tank 100 is tilted when the opening pressure of the valve portion VA or VB is set to, for example, 5 kPa. If the pressure in the fuel tank 100 is less than 5 kPa, the valve portion VA or VB will not be opened.

また、前記燃料タンク１００が傾斜した際に、前記弁部ＶＡ又はＶＢに設定した開放圧力、例えば５ｋＰａ以上の圧力の前記ＶＯＣガス又は前記燃料が前記筒本体１６内に流入したとき、前記筒本体１６の前記第１の実施形態において説明した前記弁体２２が前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１に突出した複数条の前記凸部１６Ｔの前記頂部に点接触している状態から、又は前記第１の実施形態において説明した前記弁体２２が前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触した状態から、前記弁体２２は前記昇降部材２３の下降ストローク分下方に落下し、前記燃料タンク１００内の前記ＶＯＣガスや前記燃料は前記給油口キャップ１０を介して前記自動車１０１外部へ放出される。 Further, when the fuel tank 100 is tilted and the VOC gas or the fuel having an open pressure set in the valve portion VA or VB, for example, a pressure of 5 kPa or more, flows into the cylinder body 16, the cylinder body The valve body 22 described in the first embodiment of 16 is in point contact with the top of the plurality of protrusions 16T protruding from the inner side surface 16E1 of the second side wall 16E of the cylinder body 16. From the state, or from the state where the valve body 22 described in the first embodiment is in line contact with the inner side surface 16E1 of the second side wall 16E, the valve body 22 is lowered by the descending stroke of the elevating member 23. After falling, the VOC gas and the fuel in the fuel tank 100 are discharged to the outside of the automobile 101 through the fuel filler port cap 10.

この場合、傾斜した前記筒本体１６の前記第２空間Ｓ２において、前記弁体２２は前記筒本体１６の下方に位置する前記内側面１６Ｅ１上に移動して、前記第２空間Ｓ２の縦方向の中心軸から離れてしまうこととなる。 In this case, in the second space S2 of the inclined cylinder body 16, the valve body 22 moves onto the inner side surface 16E1 located below the cylinder body 16 in the vertical direction of the second space S2. It will be separated from the central axis.

そこで、前記弁体２２が前記第２空間Ｓ２の縦方向の中心軸から離れてしまうのを最小限にするため、球状の前記弁体２２から、例えば０．１ｍｍ以上〜０．４ｍｍ以下の距離（間隔）を隔てて設けられる案内用のリブ又は囲い（共に図示せず）を前記第２側壁１６Ｅの前記内側面１６Ｅ１に内方に向けて設ける。前記リブ又は前記囲いは、前記弁部ＶＡ又はＶＢより下方の位置において、その内側端部が円錐台形状の前記第２空間Ｓ２の上下方向の中心線と平行になるように下方へと延びて形成される。 Therefore, in order to minimize the separation of the valve body 22 from the central axis in the vertical direction of the second space S2, a distance of, for example, 0.1 mm or more and 0.4 mm or less from the spherical valve body 22. Guide ribs or enclosures (both not shown) provided at intervals (intervals) are provided inward on the inner side surface 16E1 of the second side wall 16E. The rib or the enclosure extends downward at a position below the valve portion VA or VB so that its inner end is parallel to the vertical centerline of the truncated cone-shaped second space S2. It is formed.

これにより、前記距離（前記間隔）の存在により、前記リブ又は前記囲いの前記内側端部に沿って、前記弁体２２が案内されながら昇降する際に、その昇降を容易にし、前記弁部ＶＡ又はＶＢの開閉動作を安定させる。なお、前記弁体２２及び前記昇降部材２３の上下移動ストロークは前記弁体２２の直径の半分以下とする。 As a result, when the valve body 22 moves up and down while being guided along the rib or the inner end portion of the enclosure due to the presence of the distance (the interval), the valve body 22 can be easily moved up and down, and the valve portion VA can be raised and lowered. Alternatively, the opening / closing operation of VB is stabilized. The vertical movement stroke of the valve body 22 and the elevating member 23 is set to half or less of the diameter of the valve body 22.

（２）前記弁体２２及び前記昇降部材２３の第２の実施形態（弁部ＶＣ、図７（Ｄ）、図１５及び図１６参照）
次に、図７（Ｄ）、図１５及び図１６に基づいて、前記弁体２２及び前記昇降部材２３の第２の実施形態について説明するが、前記第１の実施形態が前記弁体２２及び前記昇降部材２３とを別体で構成したのに対し、前記第２の実施形態は一体にして構成したものであり、以下説明する。 (2) A second embodiment of the valve body 22 and the elevating member 23 (see valve portion VC, FIGS. 7 (D), 15 and 16).
Next, a second embodiment of the valve body 22 and the elevating member 23 will be described with reference to FIGS. 7 (D), 15 and 16, but the first embodiment is the valve body 22 and While the elevating member 23 is configured as a separate body, the second embodiment is configured integrally, and will be described below.

前記弁体２２及び前記昇降部材２３の第２の実施形態は、特に図７、図９及び図１０に示す前記第１空気通路１５を形成する前記筒本体１６に適用して説明するが、図１３及び図１４に示す前記第２空気通路１５Ａを形成する前記筒本体１６に適用してもよく、その他の構成は同一である。但し、図１３及び図１４に示すような前記第２空気通路１５Ａを前記筒本体１６に形成した場合には、後述する弁体部２２Ａの半球部分２２Ａ１の上下方向における、例えば1／２の位置における横方向の外周ＣＰ（「水平方向に切断した面の円周」であって、以下「前記半球部分２２Ａ１の前記横方向の外周ＣＰ」と略す。）が前記第２空気通路１５Ａを形成する前記凹部を除く前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触することとなり、以下の説明も、前記横方向の外周ＣＰのように理解するものとし、前記第２空気通路１５Ａを前記筒本体１６に形成した場合の実施形態の説明は省略する。 The second embodiment of the valve body 22 and the elevating member 23 will be described in particular by applying it to the cylinder body 16 forming the first air passage 15 shown in FIGS. 7, 9 and 10. It may be applied to the cylinder body 16 forming the second air passage 15A shown in 13 and FIG. 14, and other configurations are the same. However, when the second air passage 15A as shown in FIGS. 13 and 14 is formed in the cylinder body 16, the position of, for example, 1/2 in the vertical direction of the hemispherical portion 22A1 of the valve body portion 22A described later. The lateral outer peripheral CP (“the circumference of the surface cut in the horizontal direction”, hereinafter abbreviated as “the lateral outer circumference CP of the hemispherical portion 22A1”) forms the second air passage 15A. It comes into line contact with the inner side surface 16E1 of the second side wall 16E excluding the recess, and the following description shall be understood as the outer peripheral CP in the horizontal direction, and the second air passage 15A is referred to as the cylinder body. The description of the embodiment in the case of forming in 16 is omitted.

先ず、前記昇降部材２３は概ね有底中空円筒状を呈して、下部の前記大径部２３Ａと、上部の前記小径部２３Ｂと、該小径部２３Ｂの上壁２３Ｂ１の上面中央部に形成された前記弁体部２２Ａとから構成される。前記弁体部２２Ａは上部の概ね半球である前記半球部分２２Ａ１と下部の円柱部分２２Ａ２とから構成され、縦断面すると、上部の半円形状の部分と下部の長方形状の部分となる（図１５参照）。 First, the elevating member 23 has a substantially bottomed hollow cylindrical shape, and is formed on the lower large diameter portion 23A, the upper small diameter portion 23B, and the upper central portion of the upper wall 23B1 of the small diameter portion 23B. It is composed of the valve body portion 22A. The valve body portion 22A is composed of the hemispherical portion 22A1 which is a substantially hemisphere in the upper portion and the cylindrical portion 22A2 in the lower portion, and when the vertical cross section is formed, the valve body portion 22A becomes a semicircular portion in the upper portion and a rectangular portion in the lower portion (FIG. 15). reference).

そして、前記昇降部材２３の前記大径部２３Ａと前記小径部２３Ｂとの前記段差壁２３Ｅ及び前記小径部２３Ｂの前記側壁２３Ｆは、前記筒本体１６の前記下水平壁１６Ｄ及び前記第２側壁１６Ｅとは接触しないで、僅かの隙間を有している。 The stepped wall 23E between the large diameter portion 23A and the small diameter portion 23B of the elevating member 23 and the side wall 23F of the small diameter portion 23B are formed on the lower horizontal wall 16D and the second side wall 16E of the cylinder body 16. It does not come into contact with and has a slight gap.

そして、前記大経部２３Ａ内に収納された前記スプリング１７の付勢力により前記昇降部材２３は上昇され、前記弁機構部を構成する前記弁体部２２Ａの前記半球部分２２Ａ１の前記横方向の外周ＣＰが前記第２側壁１６Ｅの前記内側面１６Ｅ１に突出した複数条の前記凸部１６Ｔの前記頂部（前記第２空間Ｓ２内への突出方向における前記頂部）に押圧されて点接触することとなる。 Then, the elevating member 23 is raised by the urging force of the spring 17 housed in the large warp portion 23A, and the outer circumference of the hemispherical portion 22A1 of the valve body portion 22A constituting the valve mechanism portion in the lateral direction. The CP is pressed against the top of the plurality of protrusions 16T protruding from the inner side surface 16E1 of the second side wall 16E (the top in the direction of protrusion into the second space S2) to make point contact. ..

詳述すると、前記弁体部２２Ａの前記半球部分２２Ａ１を、全球状とした場合における上半球の上下方向における、例えば1／２の位置における前記横方向の外周ＣＰが前記第２側壁１６Ｅの前記内側面１６Ｅ１に突出した複数条の前記凸部１６Ｔの前記頂部と点接触することとなる。 More specifically, when the hemispherical portion 22A1 of the valve body portion 22A is made spherical, the outer peripheral CP in the lateral direction in the vertical direction of the upper hemisphere, for example, at a position of 1/2, is the second side wall 16E. It comes into point contact with the top of the convex portion 16T having a plurality of rows protruding from the inner side surface 16E1.

そして、本実施形態では、前記弁部ＶＣは前記弁体部２２Ａの前述した前記横方向の外周ＣＰが前記第２側壁１６Ｅの前記内側面１６Ｅ１に突出した複数条の前記凸部１６Ｔの前記頂部に押圧して点接触する部位間の前記弁体部２２Ａの横方向の点接触しない前記横方向の外周ＣＰの部分と、前記弁体部２２Ａの前記半球部分２２Ａ１を球とした場合の中心ＣＮと前記横方向の外周ＣＰとを結んでできた面ＣＵ（例えば、円錐面）を外方へ延長した面で前記第１空気通路１５を形成する前記内側面１６Ｅ１及び該内側面１６Ｅ１の両隣の前記凸部１６Ｔを切断した前記第１空気通路１５の切り口である第１連通口とで構成される。 Then, in the present embodiment, the valve portion VC has a plurality of strips of the top portion of the convex portion 16T in which the above-mentioned lateral outer peripheral CP of the valve body portion 22A projects from the inner side surface 16E1 of the second side wall 16E. The central CN when the lateral outer peripheral CP portion of the valve body portion 22A that does not make a lateral point contact and the hemispherical portion 22A1 of the valve body portion 22A are spheres. On both sides of the inner side surface 16E1 and the inner side surface 16E1 forming the first air passage 15 with a surface extending outward from a surface CU (for example, a conical surface) formed by connecting the outer peripheral CP in the lateral direction. It is composed of a first communication port which is a cut end of the first air passage 15 by cutting the convex portion 16T.

なお詳述すると、前述した前記面ＣＵを外方へ延長した面については、半径方向の外方へ延長したり、斜め上方向へ延長して形成した面である。 More specifically, the surface obtained by extending the above-mentioned surface CU outward is a surface formed by extending outward in the radial direction or extending diagonally upward.

このように構成することにより、前記筒本体１６の第１の実施形態において述べた作用と同様な作用であり、以下簡単に説明する。前記燃料タンク１００が概ね水平状態にあって、前記エンジン９９の停止中においては、前記燃料タンク１００内の内圧が高まっても、５ｋＰａ未満であれば、前記スプリング１７の付勢力により前記弁体部２２Ａの前記半球部分２２Ａ１の前記横方向の外周ＣＰが前記第２側壁１６Ｅの前記内側面１６Ｅ１に突出した前記凸部１６Ｔと点接触した状態を維持して、前記弁部ＶＣに設定された第１通路抵抗（前記弁部ＶＣを前記流体が通過するときの抵抗）により前記第１空間Ｓ１内の前記ＶＯＣガス又は前記燃料は前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００外部、即ち前記給油口キャップ１０外部へ放出されない（図１５参照）。 With this configuration, the operation is similar to the operation described in the first embodiment of the cylinder body 16, and will be briefly described below. When the fuel tank 100 is in a substantially horizontal state and the engine 99 is stopped, even if the internal pressure in the fuel tank 100 increases, if it is less than 5 kPa, the valve body portion is driven by the urging force of the spring 17. while maintaining the state in which the transverse direction of the outer peripheral CP are in contact the convex portion 16T and the point projecting into the inner surface 16E1 of the second side wall 16E of the semispherical portion 22A1 of 22A, the set in the valve portion VC Due to one passage resistance (resistance when the fluid passes through the valve portion VC), the VOC gas or the fuel in the first space S1 is outside the fuel tank 100 through the second space S2 and the opening S3. That is, it is not discharged to the outside of the fuel filler cap 10 (see FIG. 15).

そして、同じく前記エンジン９９の停止中において、前記燃料タンク１００内の圧力が、例えば５ｋＰａに達すると、前記第２側壁１６Ｅの前記第１空気通路１５内を、この高圧の前記ＶＯＣガス又は膨張した前記燃料が前記第１通路抵抗に抗して上昇して、前記弁体部２２Ａの前記半球部分２２Ａ１の前記横方向の外周ＣＰが前記第２側壁１６Ｅの前記凸部１６Ｔと点接触している前記弁部ＶＣを通過し、この斜め上方へ向けて上昇する前記ＶＯＣガス又は前記燃料が円錐台形状の前記第２空間Ｓ２内で斜め上方から下方へ前記昇降部材２３を押し下げるように作用し、前記スプリング１７の付勢力に抗して前記昇降部材２３を下降させ、前記弁体部２２Ａの前記半球部分２２Ａ１の前記横方向の外周ＣＰと前記凸部１６Ｔとの点接触を解除し、前記弁部ＶＣを開放する（図１６参照）。すると、前記燃料タンク１００内の過大な圧力（前記ＶＯＣガスや前記燃料を含む。）は、前記開口３３Ｂ、前記第１空間Ｓ１（前記隙間３５）、前記第２空間Ｓ２（前記第１空気通路１５を含む。）、前記開口Ｓ３、前記空間１２Ｓ、前記空間４４、前記空気通路４３、前記隙間４０を介して、即ち前記給油口キャップ１０を介して前記自動車１０１外部に放出されることとなる。 Then, when the pressure in the fuel tank 100 reaches, for example, 5 kPa while the engine 99 is stopped, the high-pressure VOC gas or the expansion is performed in the first air passage 15 of the second side wall 16E. The fuel rises against the first passage resistance, and the lateral outer peripheral CP of the hemispherical portion 22A1 of the valve body portion 22A is in point contact with the convex portion 16T of the second side wall 16E. passing through the valve unit VC, acts as the VOC gas or the fuel rises toward the oblique upward pushing down truncated cone the second space the elevation member 23 obliquely from above to below in the S2 of the shape, The elevating member 23 is lowered against the urging force of the spring 17, and the point contact between the lateral outer peripheral CP of the hemispherical portion 22A1 of the valve body portion 22A and the convex portion 16T is released, and the valve is released. The part VC is opened (see FIG. 16). Then, the excessive pressure in the fuel tank 100 (including the VOC gas and the fuel) is applied to the opening 33B, the first space S1 (the gap 35), and the second space S2 (the first air passage). 15), the opening S3, the space 12S, the space 44, the air passage 43, and the gap 40, that is, the fuel is discharged to the outside of the automobile 101 through the fuel filler cap 10. ..

すると、この放出により前記燃料タンク１００の内の圧力は直ちに５ｋＰａ未満の圧力の状態になって、前記スプリング１７の付勢力により前記弁体部２２Ａの前記半球部分２２Ａ１の前記横方向の外周ＣＰが前記第２側壁１６Ｅの前記凸部１６Ｔと点接触し、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Then, due to this release, the pressure inside the fuel tank 100 immediately becomes a pressure of less than 5 kPa, and the urging force of the spring 17 causes the lateral outer peripheral CP of the hemispherical portion 22A1 of the valve body portion 22A to move. In point contact with the convex portion 16T of the second side wall 16E, the valve mechanism portion has a function as a safety valve, which can improve fuel efficiency and prevent environmental pollution.

なお、前記弁体部２２Ａを、図１３及び図１４に示す前記第２空気通路１５Ａを形成する前記筒本体１６に適用した場合には、弁部は前記昇降部材２３の前記弁体部２２Ａの前記半球部分２２Ａ１の前記横方向の外周ＣＰが前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１に押圧して線接触する部位間の前記弁体部２２Ａの線接触しない前記横方向の外周ＣＰの部分と、前記弁体部２２Ａの前記半球部分２２Ａ１を球とした場合の前記中心ＣＮと前記横方向の外周ＣＰとを結んでできた前記面ＣＵ（例えば、円錐面）を外方へ延長した前記面で前記第２空気通路１５Ａを形成する前記凹部を形成するための面を切断した前記第２空気通路１５Ａの切り口である第２連通口とで構成される。 When the valve body portion 22A is applied to the cylinder body 16 forming the second air passage 15A shown in FIGS. 13 and 14, the valve portion is the valve body portion 22A of the elevating member 23. The lateral outer peripheral CP of the hemispherical portion 22A1 presses against the inner side surface 16E1 of the second side wall 16E of the cylinder body 16 to make line contact with the valve body portion 22A in the lateral direction. The surface CU (for example, a conical surface) formed by connecting the outer peripheral CP portion, the central CN when the hemispherical portion 22A1 of the valve body portion 22A is a sphere, and the outer peripheral CP in the lateral direction is outward. It is composed of a second communication port which is a cut end of the second air passage 15A by cutting a surface for forming the recess forming the second air passage 15A on the surface extended to.

この場合、前記スプリング１７の付勢力により前記弁体部２２Ａの前記半球部分２２Ａ１の前記横方向の外周ＣＰが前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１に押圧されて線接触している状態において、前記燃料タンク１００内の燃料が蒸発して発生した前記ＶＯＣガス又は膨張した前記燃料により前記燃料タンク１００内の圧力が高まって、例えば５ｋＰａに達すると、前記弁部の面積の大きさにより設定された第２通路抵抗に抗して前記内側面１６Ｅ１に形成した前記第２空気通路１５Ａ内を前記ＶＯＣガス又は前記燃料が上昇して、前記弁部を通過して、斜め上方へ向けて上昇する前記ＶＯＣガス又は前記燃料が前記スプリング１７の付勢力に抗して円錐台形状の前記第２空間Ｓ２内で斜め上方から下方へ前記昇降部材２３を押し下げて下降させ、前記弁部を開放することにより前記燃料タンク１００内の過大な圧力を前記第１空間Ｓ１、前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００外部に放出する。 In this case, the lateral outer peripheral CP of the hemispherical portion 22A1 of the valve body portion 22A is pressed against the inner side surface 16E1 of the second side wall 16E of the cylinder body 16 by the urging force of the spring 17 to make line contact. In this state, when the pressure in the fuel tank 100 is increased by the VOC gas generated by evaporation of the fuel in the fuel tank 100 or the expanded fuel and reaches, for example, 5 kPa, the area of the valve portion is increased. The VOC gas or the fuel rises in the second air passage 15A formed on the inner side surface 16E1 against the second passage resistance set by the size, passes through the valve portion, and is obliquely upward. The VOC gas or the fuel rising toward the valve pushes down the elevating member 23 diagonally upward to downward in the conical second space S2 against the urging force of the spring 17. By opening the portion, excessive pressure in the fuel tank 100 is released to the outside of the fuel tank 100 through the first space S1, the second space S2, and the opening S3.

なお、以上説明した前記弁体部２２Ａを使用する２つの実施形態において、前記燃料の消費により前記燃料タンク１００内が負圧に変わったときの作用については、前述した前記筒本体１６に形成した前記第１空気通路１５、前記第２空気通路１５Ａに適用した前記弁体２２の実施形態の作用と同様であり、ここでは説明は省略する。 In the two embodiments using the valve body portion 22A described above, the action when the inside of the fuel tank 100 changes to a negative pressure due to the consumption of the fuel is formed on the cylinder body 16 described above. The operation is the same as that of the embodiment of the valve body 22 applied to the first air passage 15 and the second air passage 15A, and the description thereof will be omitted here.

なお、以上の（２）の実施形態における５ｋＰａは、前記弁部ＶＣ又は前記弁部の面積の大きさにより設定された前記第１通路抵抗又は前記第２通路抵抗と、前記弁体部２２Ａを備えた前記昇降部材２３の重量以上の前記スプリング１７の付勢力の大きさとにより設定された圧力値である。 The 5 kPa in the above embodiment (2) is the first passage resistance or the second passage resistance set according to the size of the valve portion VC or the area of the valve portion, and the valve body portion 22A. It is a pressure value set by the magnitude of the urging force of the spring 17 which is equal to or larger than the weight of the elevating member 23 provided.

（３）前記弁体２２及び前記昇降部材２３の第３の実施形態（弁部ＶＤ、図７（Ｅ）、図１７及び図１８参照）
次に、図７（Ｅ）、図１７及び図１８に基づいて、前記弁体２２及び前記昇降部材２３の第３の実施形態について説明するが、前記弁体２２及び前記昇降部材２３の第１の実施形態が前記弁体２２及び前記昇降部材２３とを別体で構成したのに対し、前記第２の実施形態と同様に、この第３の実施形態も一体にして構成したものであり、以下説明する。この第３の実施形態は、特に図７、図９及び図１０に示す前記第１空気通路１５を形成する前記筒本体１６に適用して説明するが、図１３及び図１４に示す前記第２空気通路１５Ａを形成する前記筒本体１６に適用してもよく、その他の構成は同一である。 (3) A third embodiment of the valve body 22 and the elevating member 23 (see valve portion VD, FIGS. 7 (E), 17 and 18).
Next, a third embodiment of the valve body 22 and the elevating member 23 will be described with reference to FIGS. 7 (E), 17 and 18, but the first of the valve body 22 and the elevating member 23 will be described. In the embodiment, the valve body 22 and the elevating member 23 are separately configured, whereas the third embodiment is also integrally configured as in the second embodiment. This will be described below. This third embodiment will be described in particular by applying it to the cylinder body 16 forming the first air passage 15 shown in FIGS. 7, 9 and 10, but the second embodiment shown in FIGS. 13 and 14. It may be applied to the cylinder body 16 forming the air passage 15A, and other configurations are the same.

先ず、前記昇降部材２３は概ね有底中空円筒状を呈して、下部の前記大径部２３Ａと、上部の前記小径部２３Ｂと、この小径部２３Ｂの前記上壁２３Ｂ１の上面中央部に形成された弁体部２２Ｂとから構成される。前記弁体部２２Ｂは上部の円錐台部分２２Ｂ１と下部の円柱部分２２Ｂ２とから構成され、縦断面すると、上部の台形形状の部分と下部の長方形状の部分となる（図１７参照）。 First, the elevating member 23 has a substantially bottomed hollow cylindrical shape, and is formed on the lower large diameter portion 23A, the upper small diameter portion 23B, and the upper central portion of the upper wall 23B1 of the small diameter portion 23B. It is composed of a valve body portion 22B. The valve body portion 22B is composed of an upper truncated cone portion 22B1 and a lower cylindrical portion 22B2, and when vertically crossed, it becomes an upper trapezoidal portion and a lower rectangular portion (see FIG. 17).

前記昇降部材２３の円錐台形状の前記弁体部２２Ｂの側面ＢＢ１の上方への延長線同志で形成される角度は、対向する前記凸部１６Ｔの前記頂部の上方への延長線同志が交わってできる角度と同様に、同じく６０度である。 The angle formed by the upward extension lines of the side surface BB1 of the truncated cone-shaped valve body portion 22B of the elevating member 23 is such that the upward extension lines of the opposite convex portions 16T intersect with each other. Like the angle that can be made, it is also 60 degrees.

そして、前記大径部２３Ａ内に収納された前記スプリング１７の付勢力により前記昇降部材２３は上昇され、前記弁機構部を構成する前記弁体部２２Ｂの前記円錐台部分２２Ｂ１の側面２２ＢＢ１が前記第２側壁１６Ｅの前記内側面１６Ｅ１に突出した複数条の前記凸部１６Ｔの前記頂部（前記第２空間Ｓ２内への突出方向における頂部）に押圧されて線接触することとなる。但し、図１３及び図１４に示すような前記第２空気通路１５Ａを前記筒本体１６に形成した場合には、前記弁体部２２Ｂの前記円錐台部分２２Ｂ１の前記側面２２ＢＢ１が前記第２空気通路１５Ａを形成する凹部を除く前記第２側壁１６Ｅの前記内側面１６Ｅ１に面接触することとなり、以下の説明も、このように理解するものとし、前記第２空気通路１５Ａを前記筒本体１６に形成した場合の実施形態の説明は省略する。 Then, the elevating member 23 is raised by the urging force of the spring 17 housed in the large diameter portion 23A, and the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B constituting the valve mechanism portion is described. It is pressed against the top of the plurality of protrusions 16T protruding from the inner side surface 16E1 of the second side wall 16E (the top in the direction of protrusion into the second space S2) and comes into line contact. However, when the second air passage 15A as shown in FIGS. 13 and 14 is formed in the cylinder body 16, the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B is the second air passage. The inner side surface 16E1 of the second side wall 16E excluding the recess forming the 15A will be in surface contact with the inner side surface 16E1, and the following description shall be understood in this way, and the second air passage 15A is formed in the cylinder body 16. The description of the embodiment will be omitted.

そして、前記円錐台部分２２Ｂ１の側面２２ＢＢ１と複数条の前記凸部１６Ｔの前記頂部との接触する部分が長いので、接触する部分の前記第１空気通路１５の長さも長くなって、前記弁部ＶＤに第１通路抵抗を設定できる範囲が拡大できる。 Since the contact portion between the side surface 22BB1 of the truncated cone portion 22B1 and the top of the convex portion 16T of the plurality of strips is long, the length of the first air passage 15 of the contact portion is also long, and the valve portion The range in which the first passage resistance can be set for the VD can be expanded.

そして、本実施形態では、前記弁部ＶＤは前記弁体部２２Ｂの前記円錐台部分２２Ｂ１の前記側面２２ＢＢ１が前記第２側壁１６Ｅの前記内側面１６Ｅ１に突出した複数条の前記凸部１６Ｔの前記頂部と線接触する部位間の前記弁体部２２Ｂの横方向の線接触しない前記側面２２ＢＢ１と、この線接触しない前記側面２２ＢＢ１に対応する前記内側面１６Ｅ１及び該内側面１６Ｅ１の両隣の前記凸部１６Ｔで形成される第１連通口とで構成される。 Then, in the present embodiment, the valve portion VD is the protrusion 16T of a plurality of strips in which the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B protrudes from the inner side surface 16E1 of the second side wall 16E. The side surface 22BB1 that does not make lateral line contact with the valve body portion 22B between the parts that make line contact with the top portion, the inner side surface 16E1 corresponding to the side surface 22BB1 that does not make line contact, and the convex portions on both sides of the inner side surface 16E1. It is composed of a first communication port formed of 16T.

このように構成することにより、前記筒本体１６の第１の実施形態において述べた作用と同様であり、以下簡単に説明する。前記燃料タンク１００が概ね水平状態にあって、前記給油口キャップ１０の作用について説明する。前記エンジン９９の停止中においては、前記燃料タンク１００内の内圧が高まっても、５ｋＰａ未満であれば、前記スプリング１７の付勢力により前記弁体部２２Ｂの前記円錐台部分２２Ｂ１の前記側面２２ＢＢ１が前記第２側壁１６Ｅの前記内側面１６Ｅ１に突出した複数条の前記凸部１６Ｔの前記頂部と線接触して、前記弁部ＶＤに設定された前記第１通路抵抗（前記弁部ＶＤを前記流体が通過するときの抵抗）により前記第１空間Ｓ１内の前記ＶＯＣガス又は前記燃料は前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００外部、即ち前記給油口キャップ１０外部へ放出されない（図１７参照）。 With this configuration, the operation is the same as that described in the first embodiment of the cylinder body 16, and will be briefly described below. The operation of the fuel filler port cap 10 when the fuel tank 100 is in a substantially horizontal state will be described. While the engine 99 is stopped, even if the internal pressure in the fuel tank 100 increases, if it is less than 5 kPa, the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B is caused by the urging force of the spring 17. said second side wall 16E wherein in said top portion of the convex portion 16T of the plural rows of protruding side 16E1 and in line contact of the valve unit the first flow resistance which is set to VD (the said valve unit VD fluid The VOC gas or the fuel in the first space S1 is not discharged to the outside of the fuel tank 100, that is, to the outside of the fuel filler port cap 10 through the second space S2 and the opening S3. (See FIG. 17).

そして、同じく前記エンジン９９の停止中において、前記燃料タンク１００内の圧力が、例えば５ｋＰａに達すると、前記第２側壁１６Ｅの前記第１空気通路１５内を、この高圧の前記ＶＯＣガス又は膨張した前記燃料が前記第１通路抵抗に抗して上昇して、前記弁体部２２Ｂの前記円錐台部分２２Ｂ１の側面２２ＢＢ１が前記第２側壁１６Ｅの複数条の前記凸部１６Ｔの前記頂部と線接触している前記弁部ＶＤを通過して斜め上方へ向けて上昇する高圧の前記ＶＯＣガス又は前記燃料が円錐台形状の前記第２空間Ｓ２内で斜め上方から下方へ前記昇降部材２３を押し下げるように作用し、前記スプリング１７の付勢力に抗して前記昇降部材２３を下降させ、前記弁体部２２Ｂの前記円錐台部分２２Ｂ１の側面２２ＢＢ１と複数条の前記凸部１６Ｔの前記頂部との線接触を解除し、前記弁部ＶＤを開放する（図１８参照）。すると、前記燃料タンク１００内の過大な圧力（前記ＶＯＣガスや前記燃料を含む。）は、前記開口３３Ｂ、前記第１空間Ｓ１（前記隙間３５）、前記第２空間Ｓ２（前記第１空気通路１５を含む。）、前記開口Ｓ３、前記空間１２Ｓ、前記空間４４、前記空気通路４３、前記隙間４０を介して、即ち前記給油口キャップ１０を介して前記自動車１０１外部に放出されることとなる。 Then, when the pressure in the fuel tank 100 reaches, for example, 5 kPa while the engine 99 is stopped, the high-pressure VOC gas or the expansion is performed in the first air passage 15 of the second side wall 16E. The fuel rises against the first passage resistance, and the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B makes line contact with the top of the convex portion 16T of the plurality of strips of the second side wall 16E. The high-pressure VOC gas or fuel that passes through the valve portion VD and rises diagonally upward pushes down the elevating member 23 diagonally upward to downward in the truncated cone-shaped second space S2. The elevating member 23 is lowered against the urging force of the spring 17, and the line between the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B and the top of the convex portion 16T of the plurality of strips. The contact is released and the valve portion VD is opened (see FIG. 18). Then, the excessive pressure in the fuel tank 100 (including the VOC gas and the fuel) is applied to the opening 33B, the first space S1 (the gap 35), and the second space S2 (the first air passage). 15), the opening S3, the space 12S, the space 44, the air passage 43, and the gap 40, that is, the fuel is discharged to the outside of the automobile 101 through the fuel filler cap 10. ..

すると、この放出により前記燃料タンク１００の内の圧力は直ちに５ｋＰａ未満の圧力の状態になって、前記弁体部２２Ｂの前記円錐台部分２２Ｂ１の前記側面２２ＢＢ１が前記第２側壁１６Ｅの複数条の前記凸部１６Ｔの前記頂部と線接触し、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Then, due to this release, the pressure inside the fuel tank 100 immediately becomes a pressure of less than 5 kPa, and the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B has a plurality of rows of the second side wall 16E. In line contact with the top of the convex portion 16T, the valve mechanism portion has a function as a safety valve, which can improve fuel efficiency and prevent environmental pollution.

なお、前記弁体部２２Ｂを、図１３及び図１４に示す前記第２空気通路１５Ａを形成する前記筒本体１６に適用した場合には、前記昇降部材２３の前記弁体部２２Ｂの前記側面２２ＢＢ１が前記筒本体１６の前記第２空気通路１５Ａを形成する凹部を除く前記第２側壁１６Ｅの前記内側面１６Ｅ１に押圧して面接触する部位間の面接触しない前記側面２２ＢＢ１と、この面接触しない前記側面２２ＢＢ１に対応する前記内側面１６Ｅ１に前記凹部を形成するための面とで形成される第２連通口とで弁部を構成する。 When the valve body portion 22B is applied to the cylinder body 16 forming the second air passage 15A shown in FIGS. 13 and 14, the side surface 22BB1 of the valve body portion 22B of the elevating member 23 Does not come into surface contact with the side surface 22BB1 which does not make surface contact between the parts that press against the inner side surface 16E1 of the second side wall 16E except for the recess forming the second air passage 15A of the cylinder body 16. The valve portion is composed of a second communication port formed by a surface for forming the recess on the inner surface 16E1 corresponding to the side surface 22BB1.

この場合、前記弁体部２２Ｂの前記側面２２ＢＢ１が前記筒本体１６の前記第２空気通路１５Ａを形成する前記凹部を除く前記第２側壁１６Ｅの前記内側面１６Ｅ１に面接触している状態において、前記燃料タンク１００内の燃料が蒸発した前記ＶＯＣガス又は膨張した前記燃料によりこの燃料タンク１００内の圧力が高まって５ｋＰａに達すると、前記弁部に設定された第２通路抵抗に抗して前記第２側壁１６Ｅの前記内側面１６Ｅ１に形成された前記第２空気通路１５Ａ内を前記ＶＯＣガス又前記燃料が上昇して、前記弁部を通過して斜め上方へ向けて上昇する前記ＶＯＣガス又は前記燃料が前記スプリング１７の付勢力に抗して斜め下方へ前記昇降部材２３を押し下げて下降させ、前記弁体部２２Ｂの前記側面２２ＢＢ１と前記筒本体１６の前記第２空気通路１５Ａを形成する前記凹部を除く前記第２側壁１６Ｅの前記内側面１６Ｅ１との面接触を解除し、前記弁部を開放することにより前記燃料タンク１００内の過大な圧力を前記第１空間Ｓ１、前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００外部に放出する。 In this case, in a state where the side surface 22BB1 of the valve body portion 22B is in surface contact with the inner side surface 16E1 of the second side wall 16E excluding the recess forming the second air passage 15A of the cylinder body 16. When the pressure in the fuel tank 100 increases to 5 kPa due to the evaporated VOC gas or the expanded fuel in the fuel tank 100, the second passage resistance set in the valve portion is resisted. The VOC gas or the fuel rises in the second air passage 15A formed on the inner side surface 16E1 of the second side wall 16E, passes through the valve portion, and rises diagonally upward. The fuel pushes down the elevating member 23 diagonally downward against the urging force of the spring 17, and lowers the elevating member 23 to form the side surface 22BB1 of the valve body portion 22B and the second air passage 15A of the cylinder body 16. By releasing the surface contact of the second side wall 16E excluding the recess with the inner side surface 16E1 and opening the valve portion, excessive pressure in the fuel tank 100 is released into the first space S1 and the second space. It is discharged to the outside of the fuel tank 100 through S2 and the opening S3.

なお、以上説明した前記弁体部２２Ｂを使用する２つの実施形態において、前記燃料の消費により前記燃料タンク１００内が負圧に変わったときの作用については、前述した前記筒本体１６に形成した前記第１空気通路１５、前記第２空気通路１５Ａに適用した実施形態の作用と同様であり、ここでは説明は省略する。 In the two embodiments using the valve body portion 22B described above, the action when the inside of the fuel tank 100 changes to a negative pressure due to the consumption of the fuel is formed on the cylinder body 16 described above. The operation is the same as that of the embodiment applied to the first air passage 15 and the second air passage 15A, and the description thereof will be omitted here.

なお、前記弁体２２及び前記昇降部材２３の前述した第２及び第３の実施形態において、前記第２側壁１６Ｅの前記内側面１６Ｅ１に、複数条の前記凸部１６Ｔを突出させて前記第１空気通路１５を形成するか、又は複数個の凹部を形成させて前記第２空気通路１５Ａを形成するようにしたが、これに限らず、前記弁体部２２Ａの半球部分２２Ａ１の表面に、又は前記弁体部２２Ｂの前記円錐台部分２２Ｂ１の前記側面２２ＢＢ１の表面に下方向に延びる凸部を複数条突出させたり、複数個の凹部を形成して、空気通路を形成してもよい。即ち、前記弁体部２２Ａ又は２２Ｂに前記空気通路を形成してもよい。 In the second and third embodiments of the valve body 22 and the elevating member 23, the first side wall 16E has a plurality of articles of the convex portion 16T protruding from the inner side surface 16E1 of the second side wall 16E. The air passage 15 is formed or a plurality of recesses are formed to form the second air passage 15A, but the present invention is not limited to this, and the surface of the hemispherical portion 22A1 of the valve body portion 22A or A plurality of downwardly extending convex portions may be projected on the surface of the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B, or a plurality of concave portions may be formed to form an air passage. That is, the air passage may be formed in the valve body portion 22A or 22B.

また、前記弁体２２及び前記昇降部材２３の前述した第２及び第３の実施形態において、前記弁体部２２Ａ、２２Ｂは、前記昇降部材２３と一体化したが、材料としては、燃料に対して耐溶剤性のある合成樹脂材料であるナイロン６又はナイロン６６により作製し、軽量化を図ることができる。このため、ステンレス製の前記弁体２２と比べて、前記スプリング１７の付勢力は弱くてもよい。 Further, in the above-mentioned second and third embodiments of the valve body 22 and the elevating member 23, the valve body portions 22A and 22B are integrated with the elevating member 23, but as a material, the fuel is used. It can be made of nylon 6 or nylon 66, which is a synthetic resin material having solvent resistance, to reduce the weight. Therefore, the urging force of the spring 17 may be weaker than that of the valve body 22 made of stainless steel.

以上の実施形態で説明した前記弁機構部は、前記燃料タンク１００内の圧力が一定以上の圧力値になるまでは、前記有害な前記ＶＯＣガス又は膨張した前記燃料を前記燃料タンク１００外部、即ち前記給油口キャップ１０外部に放出せず、更に一層、前記自動車１０１の燃費向上が図れると共に環境汚染の防止ができる。 The valve mechanism portion described in the above embodiment uses the harmful VOC gas or the expanded fuel outside the fuel tank 100, that is, until the pressure inside the fuel tank 100 reaches a certain pressure value or higher. The fuel filler cap 10 is not discharged to the outside, and the fuel efficiency of the automobile 101 can be further improved and environmental pollution can be prevented.

そして、前記燃料タンク１００内の前記燃料の消費により負圧になると、前記弁部ＶＤ又は前記弁部を開き、前記大気を前記開口Ｓ３及び前記第１空気通路１５又は前記第２空気通路１５Ａを介して前記筒本体１６内へと導いて、前記燃料タンク１００内に前記大気を導入し、前記弁機構部は前記燃料タンク１００内を大気圧の状態にする機能を有する。 Then, when the pressure becomes negative due to the consumption of the fuel in the fuel tank 100, the valve portion VD or the valve portion is opened, and the atmosphere is opened to the opening S3 and the first air passage 15 or the second air passage 15A. The valve mechanism portion has a function of guiding the inside of the cylinder body 16 into the cylinder body 16 to introduce the air into the fuel tank 100, and bringing the inside of the fuel tank 100 into a state of atmospheric pressure.

なお、前記燃料タンク１００が傾斜しても、前記燃料タンク１００内の圧力、言い換えると前記弁部ＶＤ又は前記弁部より下方の圧力が、設定した圧力値、例えば５ｋＰａ未満であれば、前記弁体部２２Ｂの前記円錐台部分２２Ｂ１の前記側面２２ＢＢ１が前記第２側壁１６Ｅの複数条の前記凸部１６Ｔの前記頂部と線接触し又は前記弁体部２２Ｂの前記側面２２ＢＢ１が前記第２空気通路１５Ａを形成する前記凹部を除く前記第２側壁１６Ｅの前記内側面１６Ｅ１に面接触する状態を維持して、前記第１空気通路１５又は前記第２空気通路１５Ａの途中にある前記弁部ＶＤ又は前記弁部に設定された前記第１通路抵抗又は前記第２通路抵抗が大きく、また気体に比べて前記燃料の粘度も高く、前記給油口キャップ１０から外部へ前記燃料が漏れることを抑制できる。 Even if the fuel tank 100 is tilted, if the pressure inside the fuel tank 100, that is, the pressure below the valve portion VD or the valve portion is less than the set pressure value, for example, 5 kPa, the valve. The side surface 22BB1 of the conical base portion 22B1 of the body portion 22B is in line contact with the top of the convex portion 16T of a plurality of strips of the second side wall 16E, or the side surface 22BB1 of the valve body portion 22B is the second air passage. The valve portion VD or the valve portion VD in the middle of the first air passage 15 or the second air passage 15A while maintaining a state of surface contact with the inner side surface 16E1 of the second side wall 16E excluding the recess forming the 15A. The first passage resistance or the second passage resistance set in the valve portion is large, and the viscosity of the fuel is higher than that of the gas, so that it is possible to prevent the fuel from leaking to the outside from the fuel filler port cap 10.

なお、以上の（３）の実施形態における５ｋＰａは、前記弁部ＶＤ又は前記弁部の断面積と長さ（体積）の大きさにより設定された前記第１通路抵抗と、前記弁体部２２Ｂを備えた前記昇降部材２３の重量以上の前記付勢体１７の付勢力の大きさとにより設定された圧力値である。 The 5 kPa in the above embodiment (3) is the first passage resistance set by the cross-sectional area and length (volume) of the valve portion VD or the valve portion, and the valve body portion 22B. It is a pressure value set by the magnitude of the urging force of the urging body 17 equal to or larger than the weight of the elevating member 23 provided with the above.

（４）前記スプリングの付勢力が前記昇降部材２３と前記弁体２２との合計した重量や、前記弁体部２２Ａ又は２２Ｂを備えた前記昇降部材２３の重量の１．０倍未満とした実施形態（図１乃至図１８参照）
以上の図１乃至図１８に示す全ての実施形態については、前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２（図８及び図１３参照）との合計した重量や、前記弁体部２２Ａを備えた前記昇降部材２３（図１５参照）の重量や、前記弁体部２２Ｂを備えた前記昇降部材２３（図１７参照）の重量の１．０倍以上、例えば１．１以上〜２．０倍以下としたものであるが、１．０倍未満、例えば０．８倍以上〜０．９３倍以下とした実施形態について、説明する。 (4) The urging force of the spring is less than 1.0 times the total weight of the elevating member 23 and the valve body 22 or the weight of the elevating member 23 provided with the valve body 22A or 22B. Morphology (see FIGS. 1 to 18)
For all the embodiments shown in FIGS. 1 to 18, the urging force of the spring 17 is the total weight of the elevating member 23 and the valve body 22 (see FIGS. 8 and 13) and the valve body. 1.0 times or more the weight of the elevating member 23 (see FIG. 15) provided with the portion 22A or the weight of the elevating member 23 (see FIG. 17) including the valve body portion 22B, for example, 1.1 or more. Although it is set to 2.0 times or less, an embodiment in which it is set to less than 1.0 times, for example, 0.8 times or more and 0.93 times or less will be described.

この０．８倍以上〜０．９３倍以下とした実施形態にあっては、前記燃料タンク１００が概ね水平状態にあれば、前記燃料タンク１００内の圧力値に関係なく、前記昇降部材２３と前記弁体２２、前記弁体部２２Ａを備えた前記昇降部材２３、前記弁体部２２Ｂを備えた前記昇降部材２３は、前記スプリング１７が圧縮された状態で、下降した状態にある。 In the embodiment set to 0.8 times or more and 0.93 times or less, if the fuel tank 100 is in a substantially horizontal state, the elevating member 23 and the elevating member 23 regardless of the pressure value in the fuel tank 100. The valve body 22, the elevating member 23 including the valve body portion 22A, and the elevating member 23 including the valve body portion 22B are in a lowered state with the spring 17 compressed.

従って、前記弁体２２、前記弁体部２２Ａ、前記弁体部２２Ｂは、前記筒本体１６の前記第２側壁１６Ｅの前記凸部１６Ｔ又は前記内側面１６Ｅ１には接触せずに、前記弁部ＶＡ、ＶＢ、ＶＣ、ＶＤ等（以下「前記弁部ＶＡ等」と省略する。）は開放している。 Therefore, the valve body 22, the valve body portion 22A, and the valve body portion 22B do not come into contact with the convex portion 16T or the inner side surface 16E1 of the second side wall 16E of the cylinder body 16, and the valve portion VA, VB, VC, VD, etc. (hereinafter abbreviated as "the valve portion VA, etc.") are open.

しかし、前記燃料タンク１００が傾斜した場合には、傾斜角度が９０度になるまでは、この傾斜角度に応じて前記昇降部材２３及び前記弁体２２の、前記弁体部２２Ａを備えた前記昇降部材２３の、前記弁体部２２Ｂを備えた前記昇降部材２３の前記スプリング１７に掛かる重量が減少し、前記スプリング１７はその伸長する長さが増すこととなる。やがて、前記スプリング１７が所定の長さになると、前記弁体２２、前記弁体部２２Ａ、前記弁体部２２Ｂは、前記筒本体１６の前記第２側壁１６Ｅの前記凸部１６Ｔ又は前記内側面１６Ｅ１に接触することとなる。 However, when the fuel tank 100 is tilted, the lifting member 23 and the valve body 22 are lifted and lowered with the valve body portion 22A according to the tilt angle until the tilt angle becomes 90 degrees. The weight of the member 23 applied to the spring 17 of the elevating member 23 including the valve body portion 22B is reduced, and the length of the spring 17 that extends is increased. Eventually, when the spring 17 has a predetermined length, the valve body 22, the valve body portion 22A, and the valve body portion 22B become the convex portion 16T or the inner surface surface of the second side wall 16E of the cylinder body 16. It will come into contact with 16E1.

このため、前記燃料タンク１００が傾斜した場合には、前記燃料が前記スプリング３３の前記開口３３Ｂを介して前記筒本体１６と前記昇降部材２３との前記隙間３５内に流入したときに、前記昇降部材２３内にも流入して前記昇降部材２３内の圧力を高めて、前記スプリング１７の付勢力と相俟って、前記昇降部材２３と前記弁体２２や、前記弁体部２２Ａを備えた前記昇降部材２３や、前記弁体部２２Ｂを備えた前記昇降部材２３を押し上げて、前記弁体２２の上半球、前記弁体部２２Ａの前記半球部分２２Ａ１の上下方向における、例えば1／２の位置における前記横方向の外周ＣＦ、ＣＰが前記凸部１６Ｔの前記頂部に押圧されて点接触して（又は前記横方向の外周ＣＦ、ＣＰが前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触して）又は前記弁体部２２Ｂの前記円錐台部分２２Ｂ１の前記側面２２ＢＢ１が前記凸部１６Ｔの前記頂部に押圧されて線接触して（又は前記第２空気通路１５Ａを形成する凹部を除く前記第２側壁１６Ｅの前記内側面１６Ｅ１に押圧されて面接触して）、前記弁部ＶＡ等に設定された前記第１通路抵抗又は前記第２通路抵抗により、前記第１空間Ｓ１内の前記燃料は前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００の外部、即ち前記給油口キャップ１０の外部へと流れない。 Therefore, when the fuel tank 100 is tilted, when the fuel flows into the gap 35 between the cylinder body 16 and the elevating member 23 through the opening 33B of the spring 33, the elevating and lowering is performed. The elevating member 23, the valve body 22, and the valve body portion 22A are provided by flowing into the member 23 to increase the pressure in the elevating member 23 and in combination with the urging force of the spring 17. By pushing up the elevating member 23 and the elevating member 23 provided with the valve body portion 22B, in the vertical direction of the upper hemisphere of the valve body 22 and the hemispherical portion 22A1 of the valve body portion 22A, for example, 1/2. The lateral outer peripheral CF and CP at the position are pressed against the top of the convex portion 16T and come into point contact (or the lateral outer peripheral CF and CP are in line contact with the inner surface 16E1 of the second side wall 16E. Or the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B is pressed against the top of the convex portion 16T and in line contact (or excluding the recess forming the second air passage 15A). by the inner surface 16E1 is pressed in surface contact with), set the first passage resistance or the second passage resistance to the valve unit VA, etc. of the second side wall 16E, the fuel in said first space S1 Does not flow to the outside of the fuel tank 100, that is, to the outside of the fuel filler port cap 10 through the second space S2 and the opening S3.

以上のように、前記燃料タンク１００が傾斜した状態において、前記所定値である、例えば５ｋＰａに達するまでは、前述したような点接触、線接触、面接触している状態が維持されるため、前記燃料は前記給油口キャップ１０外部へと流出しない。 As described above, in the tilted state of the fuel tank 100 , the above-mentioned point contact, line contact, and surface contact state are maintained until the predetermined value, for example, 5 kPa is reached. The fuel does not flow out to the outside of the fuel filler cap 10.

従って、前記燃料の前記燃料タンク１００外部への放出を抑制し、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Therefore, it is possible to suppress the release of the fuel to the outside of the fuel tank 100, and the valve mechanism portion has a function as a safety valve, which can improve fuel efficiency and prevent environmental pollution.

また同じく前記燃料タンク１００が傾斜した状態で、前記燃料タンク１００からの前記燃料の圧力（流体圧力）が、例えば５ｋＰａに達した場合には、前記スプリング１７の付勢力に抗して前記昇降部材２３と前記弁体２２を下降させて、前述したような点接触、線接触、面接触している状態を解除して前記弁部を開放する。 Similarly, when the pressure (fluid pressure) of the fuel from the fuel tank 100 reaches, for example, 5 kPa in a state where the fuel tank 100 is tilted, the elevating member resists the urging force of the spring 17. The valve body 22 and the valve body 22 are lowered to release the state of point contact, line contact, and surface contact as described above, and the valve portion is opened .

なお、前記燃料タンク１００が水平状態（「概ね水平状態」含む。）に復帰した場合には、前記昇降部材２３と前記弁体２２との合計した重量や前記弁体部２２Ａ又は２２Ｂを備えた前記昇降部材２３の重量によって、これらが下降して、前記弁部ＶＡ等は、前記燃料タンク１００内の圧力値に関係なく、開放される。 When the fuel tank 100 returns to the horizontal state (including the "generally horizontal state"), the total weight of the elevating member 23 and the valve body 22 and the valve body portion 22A or 22B are provided. The weight of the elevating member 23 lowers them, and the valve portion VA and the like are opened regardless of the pressure value in the fuel tank 100.

なお、以上の（４）の実施形態における５ｋＰａは、前記弁部ＶＡ等の面積の大きさにより設定された前記第１通路抵抗又は前記第２通路抵抗と、前記弁体２２と前記昇降部材２３との合計重量未満の前記スプリング１７の付勢力の大きさとにより設定された圧力値である。 The 5 kPa in the above embodiment (4) is the first passage resistance or the second passage resistance set according to the size of the area of the valve portion VA or the like, the valve body 22, and the elevating member 23. It is a pressure value set by the magnitude of the urging force of the spring 17 which is less than the total weight of the spring 17.

（５）第２の実施形態の前記給油口キャップ１０（図１９乃至図２２参照）
以下の（５−１）及び（５−２）の説明は、前記弁部ＶＡを使用した前記給油口キャップ１０についてのものであるが、前記弁部ＶＢを使用する前記給油口キャップ１０にも適用できる。 (5) The fuel filler cap 10 of the second embodiment (see FIGS. 19 to 22).
The following description of (5-1) and (5-2) is for the fuel filler cap 10 using the valve portion VA, but also for the fuel filler cap 10 using the valve portion VB. Applicable.

（５−１）前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍以上の実施形態（図１９乃至図２１参照）
次に、前述した図７に示す前記筒本体１６や前記内蓋１３内に収納される各部品とは一部異なる部品を使用する他の実施形態の前記給油口キャップ１０について、図１９乃至図２２に基づいて説明する。先ず、前記筒本体１６の前記第１側壁１６Ｃの下端部には、外方へと広がる前記内蓋１３の前記底壁１３Ａとの段差部１６Ｇを形成する。従って、前記第１空間Ｓ１より大径で該第１空間Ｓ１に連通する空間Ｓ４が、前記内蓋１３の前記底壁１３Ａに形成される。 (5-1) An embodiment in which the urging force of the spring 17 is 1.0 times or more the total weight of the elevating member 23 and the valve body 22 (see FIGS. 19 to 21).
Next, with respect to the fuel filler port cap 10 of another embodiment using parts that are partially different from the parts housed in the cylinder body 16 and the inner lid 13 shown in FIG. 7 described above, FIGS. 19 to 19 to FIG. It will be described based on 22. First, at the lower end of the first side wall 16C of the cylinder body 16, a step portion 16G of the inner lid 13 that extends outward from the bottom wall 13A is formed. Therefore, a space S4 having a diameter larger than that of the first space S1 and communicating with the first space S1 is formed on the bottom wall 13A of the inner lid 13.

５０は概ね中空円筒状を呈する吹上部材で、該吹上部材５０は前記昇降部材２３の前記空間２３Ｓ内に収納される前記スプリング１７内に遊挿（「前記スプリング１７内に該スプリング１７の内側と隙間を存して挿入されて配置する意」、以下同じ。）される小径部５０Ａと、該小径部５０Ａより大径でその上面上に前記スプリング１７の下部を支承する段差部５０Ｂと、該段差部５０Ｂより大径であって前記段差部１６Ｇの下面にその上面が当接する大径部５０Ｃとを備えている。前記小径部５０Ａと前記大径部５０Ｃとを接続する前記段差部５０Ｂにより、前記吹上部材５０には小径空間５０Ｓ１及び該小径空間５０Ｓ１下部に連通する大径空間５０Ｓ２が形成される。 Reference numeral 50 denotes a blowing member having a substantially hollow cylindrical shape, and the blowing member 50 is loosely inserted into the spring 17 housed in the space 23S of the elevating member 23 (“inside the spring 17 and inside the spring 17). The meaning of being inserted and arranged with a gap ", the same shall apply hereinafter.) A small diameter portion 50A having a diameter larger than that of the small diameter portion 50A and a step portion 50B supporting the lower portion of the spring 17 on the upper surface thereof, and the step portion 50B. It is provided with a large diameter portion 50C having a diameter larger than that of the step portion 50B and the upper surface of the step portion 16G abuts on the lower surface thereof. The stepped portion 50B connecting the small diameter portion 50A and the large diameter portion 50C forms a small diameter space 50S1 and a large diameter space 50S2 communicating with the lower portion of the small diameter space 50S1 in the blow-up member 50.

５１は第１抵抗部材で、平面視円形状を呈する下部５１Ａと、該下部５１Ａの上面中央部に立設した円柱状の上部５１Ｂとを備えている。前記第１抵抗部材５１の前記下部５１Ａの上面周縁部は前記段差部５０Ｂの下面に当接した状態で、前記下部５１Ａは前記吹上部材５０の前記大径空間５０Ｓ２内に収納（配置）される。このとき、前記上部５１Ｂは前記小径空間５０Ｓ１を形成する内側面と離れた状態で前記小径空間５０Ｓ１内に収納されることなる。従って、前記小径空間５０Ｓ１の横断平面積は、前記上部５１Ｂが前記小径空間５０Ｓ１内に収納された状態では、その分だけ横断平面積が小さくなり、通路抵抗が増加して前記小径空間５０Ｓ１内に流入する前記ＶＯＣガス又は前記燃料の圧力を減少させる。 Reference numeral 51 denotes a first resistance member, which includes a lower portion 51A having a circular shape in a plan view and a columnar upper portion 51B erected in the center of the upper surface of the lower portion 51A. The lower portion 51A of the first resistance member 51 is housed (arranged) in the large-diameter space 50S2 of the blow-up member 50 in a state where the upper peripheral portion of the lower portion 51A is in contact with the lower surface of the step portion 50B. .. At this time, the upper portion 51B is housed in the small diameter space 50S1 in a state separated from the inner side surface forming the small diameter space 50S1. Therefore, the cross-sectional flat area of the small-diameter space 50S1 is reduced by that amount when the upper portion 51B is housed in the small-diameter space 50S1, and the passage resistance is increased to be within the small-diameter space 50S1. The pressure of the inflowing VOC gas or the fuel is reduced.

なお、前記第１抵抗部材５１の前記下部５１Ａの上面及び下面には外径が周端部に至らない位置まで延びた、平面視円形状の溝５１Ｃ、５１Ｄが形成されると共に、前記溝５１Ｃと５１Ｄとを連通させる連通口５１Ｅが２個形成される。この連通口５１Ｅは横断平面積が小さくて通路抵抗が大きく、前記ＶＯＣガス又は前記燃料が通過する通路抵抗を大きくして前記小径空間５０Ｓ１内に流入する前記ＶＯＣガス又は前記燃料の圧力を減少させる。なお、前記溝５１Ｃの深さは、例えば０．２ｍｍで、前記溝５１Ｄの深さは、例えば０．３ｍｍである。 The upper and lower surfaces of the lower portion 51A of the first resistance member 51 are formed with circular grooves 51C and 51D in a plan view extending to a position where the outer diameter does not reach the peripheral end portion, and the grooves 51C are formed. Two communication ports 51E are formed to communicate the and 51D. The communication port 51E has a small cross-sectional area and a large passage resistance, increases the passage resistance through which the VOC gas or the fuel passes, and reduces the pressure of the VOC gas or the fuel flowing into the small diameter space 50S1. .. The depth of the groove 51C is, for example, 0.2 mm, and the depth of the groove 51D is, for example, 0.3 mm.

５２は平面視円形状を呈する第２抵抗部材で、前記第１抵抗部材５１の前記下部５１Ａの上面周縁部は前記段差部５０Ｂの下面に当接した状態で前記吹上部材５０の前記大径空間５０Ｓ２内に収納される。該第２抵抗部材５２の上面及び下面には外径が周端部に至らない位置まで延びた、平面視円形状の溝５２Ａ、５２Ｂが形成されると共に、前記溝５２Ａと前記溝５２Ｂとを連通させる連通口５２Ｃが２個形成される。この連通口５２Ｃは横断平面積が小さくて通路抵抗が大きく、前記ＶＯＣガス又は前記燃料が通過する通路抵抗を大きくして前記第１抵抗部材５１の前記連通口５１Ｅを介して前記小径空間５０Ｓ１内に流入する前記ＶＯＣガス又は前記燃料の圧力を減少させる。なお、前記溝５２Ａの深さは、例えば０．２ｍｍで、前記溝５２Ｂの深さは、例えば０．３ｍｍである。そして、前記溝５２Ａ及び５２Ｂの横断平面積と、前記連通口５２Ｃの横断平面積及び長さとにより設定された通路抵抗が形成され、通過する前記流体の圧力を減圧できる。 Reference numeral 52 denotes a second resistance member having a circular shape in a plan view, and the large-diameter space of the blow-up member 50 in a state where the upper peripheral portion of the lower portion 51A of the first resistance member 51 is in contact with the lower surface of the step portion 50B. It is stored in 50S2. Circular grooves 52A and 52B in a plan view are formed on the upper surface and the lower surface of the second resistance member 52 so that the outer diameter does not reach the peripheral end portion, and the grooves 52A and the grooves 52B are formed. Two communication ports 52C are formed to communicate with each other. The communication port 52C has a small cross-sectional flat area and a large passage resistance, and the passage resistance through which the VOC gas or the fuel passes is increased to enter the small diameter space 50S1 via the communication port 51E of the first resistance member 51. Reduces the pressure of the VOC gas or fuel flowing into the. The depth of the groove 52A is, for example, 0.2 mm, and the depth of the groove 52B is, for example, 0.3 mm. Then, a passage resistance set by the transverse flat area of the grooves 52A and 52B and the transverse flat area and length of the communication port 52C is formed, and the pressure of the flowing fluid can be reduced.

なお、特に前記燃料は気体に比べ粘性があり、前記燃料タンク１００が傾斜した際に、前記燃料タンク１００からの前記燃料が前記第１抵抗部材５１の前記連通口５１Ｅを介して前記吹上部材５０の前記小径空間５０Ｓ１に流入したとき、外気温の上昇により前記燃料の圧力が上昇していても、前記吹上部材５０、前記第２抵抗部材５２、前記第１抵抗部材５１に形成される通路抵抗により、前記燃料の圧力を減少することができ、前記弁部ＶＡ（又は前記弁部ＶＢ）にかかる圧力が小さくなり、前記弁部ＶＡ（又は前記弁部ＶＢ）を介して前記給油口キャップ１０外部への前記燃料の流出を抑制することができる。また、（５）の実施形態においては、前記第１抵抗部材５１を使用するが、前記第２抵抗部材５２は必ずしも使用しなくともよい。 In particular, the fuel is more viscous than gas, and when the fuel tank 100 is tilted, the fuel from the fuel tank 100 passes through the communication port 51E of the first resistance member 51 and the blow-up member 50. When the fuel flows into the small diameter space 50S1, even if the fuel pressure rises due to an increase in the outside temperature, the passage resistance formed in the blow-up member 50, the second resistance member 52, and the first resistance member 51. As a result, the pressure of the fuel can be reduced, the pressure applied to the valve portion VA (or the valve portion VB) becomes smaller, and the fuel filler port cap 10 is passed through the valve portion VA (or the valve portion VB). The outflow of the fuel to the outside can be suppressed. Further, in the embodiment (5), the first resistance member 51 is used, but the second resistance member 52 does not necessarily have to be used.

なお、以上の図１９乃至図２２に示す実施形態における前記弁機構部は、前記筒本体１６、前記昇降部材２３、前記弁体２２、前記スプリング１７、前記吹上部材５０、前記第１抵抗部材５１及び前記第２抵抗部材５２などで構成される。 The valve mechanism portion in the embodiment shown in FIGS. 19 to 22 described above includes the cylinder body 16, the elevating member 23, the valve body 22, the spring 17, the blow-up member 50, and the first resistance member 51. And the second resistance member 52 and the like.

以上の構成により、次に前述した図７に示す前記筒本体１６や前記内蓋１３内に収納される各部品とは一部異なる部品を使用する他の実施形態の前記給油口キャップ１０の組み立てについて、説明する。尚、前記フィルター３８の前記中抜き部３８Ａに前記内蓋１３の前記筒本体１６を挿入させた状態で前記外蓋１２内に前記内蓋１３を収納させ、前記内蓋１３と前記外蓋１２とは固定されているものとする。 With the above configuration, the assembly of the fuel filler port cap 10 of another embodiment using parts that are partially different from the parts housed in the cylinder body 16 and the inner lid 13 shown in FIG. 7 described above. Will be described. The inner lid 13 is housed in the outer lid 12 with the cylinder body 16 of the inner lid 13 inserted into the hollow portion 38A of the filter 38, and the inner lid 13 and the outer lid 12 are stored. Is fixed.

先ず、例えば前記昇降部材２３上に前記弁体２２を載置させた状態で、前記筒本体１６の空間内に前記昇降部材２３を収納する。すると、前記昇降部材２３の前記小径部２３Ｂが前記弁体２２を載置した状態で前記第２空間Ｓ２内に入り込むと共に、且つ前記大径部２３Ａが前記第１空間Ｓ１内に入り込むこととなる。 First, for example, the elevating member 23 is housed in the space of the cylinder body 16 with the valve body 22 placed on the elevating member 23. Then, the small diameter portion 23B of the elevating member 23 enters the second space S2 with the valve body 22 mounted on it, and the large diameter portion 23A enters the first space S1. ..

次に、前記昇降部材２３の前記空間２３Ｓ内に前記スプリング１７を収納し、前記吹上部材５０の前記大径空間５０Ｓ２内に前記第１抵抗部材５１の前記下部５１Ａを収納させながら前記第２抵抗部材５２の上面を前記吹上部材５０の前記大径部５０Ｃの下面及び前記第１抵抗部材５１の下面に当接させて、前記大径部５０Ｃの上面の周縁部が前記段差部１６Ｇの下面に当接するようにして、前記昇降部材２３の前記空間２３Ｓ内に収納された前記スプリング１７内に前記吹上部材５０の前記小径部５０Ａが納まるように且つ前記内蓋１３の前記底壁１３Ａに形成された前記空間Ｓ４内に前記大径部５０Ｃ及び前記第２抵抗部材５２を収納させた状態で、前記内蓋１３の前記底壁１３Ａの前記固定孔１３Ｇと前記スプリング３３の前記固定孔３３Ａとに前記リベット３４を挿入することにより、前記底壁１３Ａに前記スプリング３３を固定する。 Next, the spring 17 is housed in the space 23S of the elevating member 23, and the lower portion 51A of the first resistance member 51 is housed in the large diameter space 50S2 of the blowing member 50 while the second resistance is housed. The upper surface of the member 52 is brought into contact with the lower surface of the large diameter portion 50C of the blow-up member 50 and the lower surface of the first resistance member 51, and the peripheral edge portion of the upper surface of the large diameter portion 50C is brought into the lower surface of the step portion 16G. The small diameter portion 50A of the blow-up member 50 is formed in the spring 17 housed in the space 23S of the elevating member 23 so as to be in contact with the bottom wall 13A of the inner lid 13. In a state where the large diameter portion 50C and the second resistance member 52 are housed in the space S4, the fixing hole 13G of the bottom wall 13A of the inner lid 13 and the fixing hole 33A of the spring 33 are formed. By inserting the rivet 34, the spring 33 is fixed to the bottom wall 13A.

これにより、前記弁機構部を備えた前記給油口キャップ１０の組み立てが終了する。そして、このようにして組み立てられた前記給油口キャップ１０は、前記給油口９８に取り付けられて、利用されることとなる。 As a result, the assembly of the fuel filler port cap 10 provided with the valve mechanism is completed. Then, the refueling port cap 10 assembled in this way is attached to the refueling port 98 and used.

以下、前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍以上、例えば１．１以上〜２．０倍以下とした実施形態について、前記給油口キャップ１０の作用について説明する。 Hereinafter, in the embodiment in which the urging force of the spring 17 is 1.0 times or more, for example 1.1 or more to 2.0 times or less the total weight of the elevating member 23 and the valve body 22, the fuel filler port The operation of the cap 10 will be described.

先ず、前記燃料タンク１００が概ね水平状態にあって、前記エンジン９９の停止中において、外気温度が上昇して、前記燃料タンク１００内の内圧が高まっても、前記燃料タンク１００内の前記内圧が、例えば５ｋＰａ未満であれば、前記弁体２２の前記横方向の外周ＣＦが前記凸部１６Ｔの前記頂部に前記スプリング１７の付勢力により押圧されて点接触して（又は前記横方向の外周ＣＦが前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触して）、前記弁部ＶＡに設定された前記第１通路抵抗（又は前記弁部ＶＢに設定された前記第２通路抵抗）により前記第１空間Ｓ１内の前記ＶＯＣガス又は前記燃料は前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００外部、即ち前記給油口キャップ１０外部へ放出されない。 First, even if the fuel tank 100 is in a substantially horizontal state and the outside air temperature rises and the internal pressure in the fuel tank 100 increases while the engine 99 is stopped, the internal pressure in the fuel tank 100 remains. For example, if it is less than 5 kPa, the lateral outer peripheral CF of the valve body 22 is pressed against the top of the convex portion 16T by the urging force of the spring 17 and makes point contact (or the lateral outer peripheral CF). There contact lines the inner surface 16E1 of the second side wall 16E), wherein the set first flow resistance in the valve unit VA (or set the second passage resistance to the valve unit VB) first The VOC gas or the fuel in the space S1 is not discharged to the outside of the fuel tank 100, that is, to the outside of the fuel filler port cap 10 through the second space S2 and the opening S3.

なお、（５−１）の実施形態における５ｋＰａは、前記弁部ＶＡ(又は前記弁部ＶＢ)の面積の大きさにより設定された前記第１通路抵抗又は前記第２通路抵抗と、前記弁体２２と前記昇降部材２３との合計重量以上の前記スプリング１７の付勢力の大きさとにより設定された圧力値である。なお、以下に説明する（６−２）、（７−１）の実施形態における５ｋＰａも、（５−１）と同様の圧力値である。 The 5 kPa in the embodiment of (5-1) is the first passage resistance or the second passage resistance set by the size of the area of the valve portion VA (or the valve portion VB) and the valve body. It is a pressure value set by the magnitude of the urging force of the spring 17 which is equal to or larger than the total weight of the lifting member 23 and the lifting member 23. The pressure value of 5 kPa in the embodiments of (6-2) and (7-1) described below is the same as that of (5-1).

このとき、前記第２抵抗部材５２に前記連通口５２Ｃ及び前記第１抵抗部材５１に前記連通口５１Ｅが形成され、更に前記吹上部材５０の前記小径空間５０Ｓ１内には前記第１抵抗部材５１の円柱状の前記上部５１Ｂが存在して、通路抵抗が増加されるので、前記筒本体１６内に流入する前記ＶＯＣガス又は前記燃料の圧力を減少させるので、前記ＶＯＣガス又は前記燃料の前記燃料タンク１００外部の放出を抑制する。 At this time, the communication port 52C is formed in the second resistance member 52 and the communication port 51E is formed in the first resistance member 51, and the first resistance member 51 is further formed in the small diameter space 50S1 of the blow-up member 50. Since the cylindrical upper portion 51B is present and the passage resistance is increased, the pressure of the VOC gas or the fuel flowing into the cylinder body 16 is reduced, so that the fuel tank of the VOC gas or the fuel is used. 100 Suppresses external emissions.

このため、前記燃料から蒸発した有害な前記ＶＯＣガス又は前記燃料を前記自動車１０１外部に放出させないので、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Therefore, since the harmful VOC gas or the fuel evaporated from the fuel is not released to the outside of the automobile 101, the valve mechanism portion has a function as a safety valve, and can improve fuel efficiency and the environment. Contamination can be prevented.

そして、同じく前記エンジン９９の停止中において、外気温度の更なる上昇に伴って、前記ＶＯＣガスの発生量が更に増大して、又は前記燃料タンク１００内が前記燃料の満タン状態かこれに近い状態下で前記燃料が膨張して、前記燃料タンク１００内の圧力が更に高まって、例えば５ｋＰａに達すると、前記燃料タンク１００からの前記ＶＯＣガス又は前記燃料は、前記開口３３Ｂ、前記第２抵抗部材５２の前記溝５２Ｂ、前記連通口５２Ｃ及び前記溝５２Ａ、前記第１抵抗部材５１の前記溝５１Ｄ、前記連通口５１Ｅ及び前記溝５１Ｃ、前記吹上部材５０の前記大径空間５０Ｓ２及び前記上部５１Ｂの周囲の前記小径空間５０Ｓ１を経て前記昇降部材２３の前記空間２３Ｓに入り込む。このとき、前記第１抵抗部材５１の前記連通口５１Ｅで前記ＶＯＣガス又は前記燃料の圧力は減少されると共に前記第１抵抗部材５１の前記上部５１Ｂにより前記上部５１Ｂの周囲の前記小径空間５０Ｓ１を通過する前記ＶＯＣガス又は前記燃料の圧力も減少されて流速が早められた前記ＶＯＣガス又は前記燃料は、前記昇降部材２３の前記空間２３Ｓ内に噴出する。このため、前記ＶＯＣガス又は前記燃料は、前記昇降部材２３の前記大径部２３Ａの側壁下部と前記吹上部材５０の前記大径部５０Ｃとの隙間、前記第１空間Ｓ１（前記隙間３５）、前記第２空間Ｓ２（前記第１空気通路１５又は前記第２空気通路１５Ａを含む。）、前記開口Ｓ３、前記空間１２Ｓ、前記空間４４、前記空気通路４３、前記隙間４０を介して、前記給油口キャップ１０を介して前記自動車１０１外部に放出されることとなる。 Similarly, while the engine 99 is stopped, the amount of VOC gas generated further increases with the further rise in the outside air temperature, or the inside of the fuel tank 100 is at or near the full state of the fuel. When the fuel expands under the condition and the pressure in the fuel tank 100 further increases to reach, for example, 5 kPa, the VOC gas or the fuel from the fuel tank 100 has the opening 33B, the second resistance. The groove 52B of the member 52, the communication port 52C and the groove 52A, the groove 51D of the first resistance member 51, the communication port 51E and the groove 51C, the large-diameter space 50S2 of the blow-up member 50, and the upper portion 51B. It enters the space 23S of the elevating member 23 through the small diameter space 50S1 around the. At this time, the pressure of the VOC gas or the fuel is reduced at the communication port 51E of the first resistance member 51, and the upper portion 51B of the first resistance member 51 creates the small diameter space 50S1 around the upper portion 51B. The VOC gas or the fuel that passes through the VOC gas or the fuel whose flow velocity is increased by reducing the pressure of the VOC gas or the fuel is ejected into the space 23S of the elevating member 23. Therefore, the VOC gas or the fuel is a gap between the lower side wall of the large diameter portion 23A of the elevating member 23 and the large diameter portion 50C of the blow-up member 50, the first space S1 (the gap 35), and the like. The refueling is performed through the second space S2 (including the first air passage 15 or the second air passage 15A), the opening S3, the space 12S, the space 44, the air passage 43, and the gap 40. It will be discharged to the outside of the automobile 101 through the mouth cap 10.

即ち、前記第２側壁１６Ｅの各凸部１６Ｔ間に形成された前記第１空気通路１５内（前記第２側壁１６Ｅの前記内側面１６Ｅ１に形成された前記第２空気通路１５Ａ内）を高圧の前記ＶＯＣガス又は膨張した前記燃料が前記弁部ＶＡに設定された前記第１通路抵抗（又は前記弁部ＶＢに設定された前記第２通路抵抗）に抗して斜め上方に向けて上昇して、前記弁部ＶＡ（又は前記弁部ＶＢ）を通過する。このため、前記弁部ＶＡ（又は前記弁部ＶＢ）を通過して斜め上方に向けて上昇する前記ＶＯＣガス又は前記燃料が円錐台形状の前記第２空間Ｓ２内で斜め上方から下方へ前記弁体２２を押し下げるように作用する。 That is, a high pressure is applied in the first air passage 15 formed between the convex portions 16T of the second side wall 16E (inside the second air passage 15A formed on the inner side surface 16E1 of the second side wall 16E). The VOC gas or the expanded fuel rises diagonally upward against the first passage resistance set in the valve portion VA (or the second passage resistance set in the valve portion VB). , Passing through the valve portion VA (or the valve portion VB). Therefore, the VOC gas or the fuel that passes through the valve portion VA (or the valve portion VB) and rises diagonally upward is the valve from diagonally upward to downward in the truncated cone-shaped second space S2. It acts to push down the body 22.

従って、前記ＶＯＣガス又は前記燃料により、前記スプリング１７の付勢力に抗して前記昇降部材２３の前記大径部２３Ａの前記側壁下部が前記吹上部材５０の前記大径部５０Ｃの上面に当接するまで、前記弁体２２及び前記昇降部材２３が下降され、前記弁部ＶＡ（又は前記弁部ＶＢ）を開放する（図２１参照）。 Therefore, the lower side wall of the large diameter portion 23A of the elevating member 23 comes into contact with the upper surface of the large diameter portion 50C of the blow-up member 50 against the urging force of the spring 17 by the VOC gas or the fuel. Until then, the valve body 22 and the elevating member 23 are lowered to open the valve portion VA (or the valve portion VB) (see FIG. 21).

このため、前記燃料タンク１００内の圧力が、５ｋＰａ以上となって、上述したように、前記弁体２２の前記横方向の外周ＣＦと前記凸部１６Ｔの前記頂部との点接触（又は前記横方向の外周ＣＦと前記内側面１６Ｅ１との線接触）を解除して、前記弁部ＶＡ（又は前記弁部ＶＢ）を開放すると、前記燃料タンク１００内の過大な圧力（前記ＶＯＣガスや前記燃料を含む。）は、前記給油口キャップ１０の外部、即ち前記自動車１０１外部に放出されることとなる。 Therefore, the pressure in the fuel tank 100 becomes 5 kPa or more, and as described above , the point contact (or the lateral) between the outer peripheral CF of the valve body 22 in the lateral direction and the top of the convex portion 16T When the valve portion VA (or the valve portion VB) is released by releasing the line contact between the outer peripheral CF in the direction and the inner side surface 16E1 , the excessive pressure (the VOC gas or the fuel) in the fuel tank 100 is released. Is released to the outside of the fuel filler cap 10, that is, to the outside of the automobile 101.

すると、この放出により前記燃料タンク１００の内の圧力は直ちに５ｋＰａ未満の圧力の状態になり、前記スプリング１７の付勢力により前記昇降部材２３及び前記弁体２２が上昇して、前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部１６Ｔの前記頂部と点接触して（又は前記弁体２２の前記横方向の外周ＣＦが前記内側面１６Ｅ１に線接触して）、図２０に示すような状態となる。従って、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Then, due to this release, the pressure inside the fuel tank 100 immediately becomes a pressure of less than 5 kPa, and the elevating member 23 and the valve body 22 rise due to the urging force of the spring 17, and the valve body 22 The lateral outer peripheral CF is in point contact with the top of the plurality of convex portions 16T (or the lateral outer CF of the valve body 22 is in line contact with the inner side surface 16E1), and FIG. It will be in the state shown. Therefore, the valve mechanism portion has a function as a safety valve, can improve fuel efficiency, and can prevent environmental pollution.

なお、図１９乃至図２１に基づいた説明は、前記燃料タンク１００が概ね水平状態にある場合の作用についての説明であったが、前記燃料タンク１００が傾斜した場合の作用についても同様である。 The description based on FIGS. 19 to 21 was for the action when the fuel tank 100 is in a substantially horizontal state, but the same applies to the action when the fuel tank 100 is tilted.

即ち、前記弁部ＶＡ（又は前記弁部ＶＢ）の開放圧力を、例えば５ｋＰａに設定した場合において、前記燃料タンク１００が傾斜しても、前記燃料タンク１００内の圧力が５ｋＰａ未満であれば、前記弁部ＶＡ（又は前記弁部ＶＢ）は開放しない。従って、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 That is, when the opening pressure of the valve portion VA (or the valve portion VB) is set to, for example, 5 kPa, even if the fuel tank 100 is tilted, if the pressure in the fuel tank 100 is less than 5 kPa, The valve portion VA (or the valve portion VB) is not opened. Therefore, the valve mechanism portion has a function as a safety valve, can improve fuel efficiency, and can prevent environmental pollution.

また、前記燃料タンク１００が傾斜した際に、例えば５ｋＰａ以上の圧力の前記ＶＯＣガス又は前記燃料が前記筒本体１６内に流入したとき、前記弁体２２が前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１に突出した複数条の前記凸部１６Ｔの前記頂部に点接触している状態（又は前記弁体２２が前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触している状態）から前記弁体２２は前記昇降部材２３の下降ストローク分下方に下降し、前記燃料タンク１００内の前記ＶＯＣガスや前記燃料は前記給油口キャップ１０を介して前記自動車１０１外部へ放出される。 Further, when the fuel tank 100 is tilted, for example, when the VOC gas having a pressure of 5 kPa or more or the fuel flows into the cylinder body 16, the valve body 22 causes the second side wall 16E of the cylinder body 16. A state in which the valve body 22 is in point contact with the top of the convex portion 16T having a plurality of strips protruding from the inner surface surface 16E1 (or the valve body 22 is in line contact with the inner surface surface 16E1 of the second side wall 16E of the cylinder body 16. The valve body 22 descends downward by the descending stroke of the elevating member 23, and the VOC gas and the fuel in the fuel tank 100 go to the outside of the automobile 101 via the fuel filler port cap 10. It is released.

（５−２）前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍未満の実施形態（図１９、図２１及び図２２参照）
以上の図１９乃至図２１に示す実施形態については、前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２（図８及び図１３参照）との合計した重量の１．０倍以上、例えば１．１以上〜２．０倍以下としたものであるが、１．０倍未満、例えば０．８倍以上〜０．９３倍以下とした実施形態について、説明する。 (5-2) An embodiment in which the urging force of the spring 17 is less than 1.0 times the total weight of the elevating member 23 and the valve body 22 (see FIGS. 19, 21 and 22).
In the embodiment shown in FIGS. 19 to 21, the urging force of the spring 17 is 1.0 times or more the total weight of the elevating member 23 and the valve body 22 (see FIGS. 8 and 13). For example, the embodiment is set to 1.1 times or more and 2.0 times or less, but is less than 1.0 times, for example, 0.8 times or more and 0.93 times or less.

この０．８倍以上〜０．９３倍以下とした実施形態にあっては、前記燃料タンク１００が概ね水平状態にあれば、前記燃料タンク１００内の圧力値に関係なく、図２１に示すように、前記昇降部材２３と前記弁体２２は、前記弁体２２と前記昇降部材２３との合計重量未満の付勢力で前記スプリング１７が圧縮された状態で、下降している。 In the embodiment set to 0.8 times or more and 0.93 times or less, as shown in FIG. 21, if the fuel tank 100 is in a substantially horizontal state, regardless of the pressure value in the fuel tank 100. In addition, the elevating member 23 and the valve body 22 are lowered in a state where the spring 17 is compressed by an urging force less than the total weight of the valve body 22 and the elevating member 23.

従って、前記弁体２２は前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１の前記凸部１６Ｔには点接触せずに（又は前記弁体２２は前記内側面１６Ｅ１に線接触せずに）、前記弁部ＶＡ（又は前記弁部ＶＢ）は開放している。 Therefore, the valve body 22 does not make point contact with the convex portion 16T of the inner side surface 16E1 of the second side wall 16E of the cylinder body 16 (or the valve body 22 does not make line contact with the inner side surface 16E1. The valve portion VA (or the valve portion VB) is open.

しかし、前記燃料タンク１００が傾斜した場合には、傾斜角度が９０度になるまではこの傾斜角度に応じて前記昇降部材２３と前記弁体２２との前記スプリング１７に掛かる重量が減少し、前記スプリング１７はその伸長する長さが増すこととなる。従って、前記スプリング１７に掛かる重量が減少するに伴って、前記スプリング１７の付勢力により前記弁体２２は押し上げられ、やがて前記スプリング１７の長さが所定の長さになると、前記弁体２２の前記横方向の外周ＣＦは前記筒本体１６の前記第２側壁１６Ｅの前記凸部１６Ｔの前記頂部（又は前記弁体２２は前記内側面１６Ｅ１）に押圧されて接触することとなる。 However, when the fuel tank 100 is tilted, the weight of the elevating member 23 and the valve body 22 on the spring 17 decreases according to the tilt angle until the tilt angle reaches 90 degrees. The length of the spring 17 that extends is increased. Therefore, as the weight applied to the spring 17 decreases, the valve body 22 is pushed up by the urging force of the spring 17, and when the length of the spring 17 reaches a predetermined length, the valve body 22 The outer peripheral CF in the lateral direction is pressed against and contacts the top portion (or the valve body 22 is the inner side surface 16E1) of the convex portion 16T of the second side wall 16E of the cylinder body 16.

即ち、図２２に示すように、前記燃料タンク１００が傾斜した場合には、前記燃料が前記スプリング３３の前記開口３３Ｂを介して、前記第２抵抗部材５２の前記溝５２Ｂ、前記連通口５２Ｃ及び前記溝５２Ａ、前記第１抵抗部材５１の前記溝５１Ｄ、前記連通口５１Ｅ及び前記溝５１Ｃ、前記上部５１Ｂの周囲の前記小径空間５０Ｓ１を経て前記昇降部材２３の前記空間２３Ｓに入り込む。このとき、前記第１抵抗部材５１の前記連通口５１Ｅで前記燃料の圧力は減少されると共に前記第１抵抗部材５１の前記上部５１Ｂにより前記上部５１Ｂの周囲の前記小径空間５０Ｓ１を通過する前記燃料の圧力も減少されて流速が早められた前記燃料は前記昇降部材２３の前記空間２３Ｓ内に噴出する。このため、前記スプリング１７の付勢力と相俟って、前記昇降部材２３と前記弁体２２を素早く押し上げて、前記弁体２２の前記横方向の外周ＣＦは前記筒本体１６の前記第２側壁１６Ｅの前記凸部１６Ｔの前記頂部に又は前記弁体２２は前記内側面１６Ｅ１に押圧されて点接触又は線接触することとなる。 That is, as shown in FIG. 22, when the fuel tank 100 is tilted, the fuel passes through the opening 33B of the spring 33, the groove 52B of the second resistance member 52, the communication port 52C, and the communication port 52C. It enters the space 23S of the elevating member 23 through the groove 52A, the groove 51D of the first resistance member 51, the communication port 51E and the groove 51C, and the small diameter space 50S1 around the upper portion 51B. At this time, the pressure of the fuel is reduced at the communication port 51E of the first resistance member 51, and the fuel that passes through the small diameter space 50S1 around the upper portion 51B by the upper portion 51B of the first resistance member 51. The fuel whose flow velocity has been increased by reducing the pressure of the elevating member 23 is ejected into the space 23S of the elevating member 23. Therefore, in combination with the urging force of the spring 17, the elevating member 23 and the valve body 22 are quickly pushed up, and the lateral outer peripheral CF of the valve body 22 is the second side wall of the cylinder body 16. The valve body 22 is pressed against the top of the convex portion 16T of 16E or the valve body 22 to make point contact or line contact with the inner side surface 16E1.

なお、（５−２）の実施形態における５ｋＰａは、前記弁部ＶＡ（又は前記弁部ＶＢ）の面積の大きさにより設定された前記第１通路抵抗（又は前記第２通路抵抗）と、前記弁体２２と前記昇降部材２３との合計重量未満の前記スプリング１７の付勢力の大きさとにより設定された圧力値である。なお、以下に説明する（６−１）、（７−２）の実施形態における５ｋＰａも、（５−２）と同様の圧力値である。 In addition, 5 kPa in the embodiment of (5-2) is the first passage resistance (or the second passage resistance) set by the size of the area of the valve portion VA (or the valve portion VB) and the said. It is a pressure value set by the magnitude of the urging force of the spring 17 which is less than the total weight of the valve body 22 and the elevating member 23. The pressure value of 5 kPa in the embodiments of (6-1) and (7-2) described below is the same as that of (5-2).

以上のように、前記燃料タンク１００が傾斜した状態において、前記所定値である、例えば５ｋＰａに達するまでは前記弁体２２の前記横方向の外周ＣＦが前記筒本体１６の前記第２側壁１６Ｅの前記凸部１６Ｔの前記頂部に点接触する状態又は前記内側面１６Ｅ１に線接触する状態を維持しているため、前記弁部ＶＡ（又は前記弁部ＶＢ）に設定された前記第１通路抵抗（又は前記第２通路抵抗）により、前記第１空間Ｓ１内の前記燃料は、前記昇降部材２３の前記大径部２３Ａの前記側壁下部と前記吹上部材５０との隙間、前記第１空間Ｓ１（前記隙間３５）、前記第２空間Ｓ２（前記第１空気通路１５を含む。）、前記開口Ｓ３を介して前記燃料タンク１００の外部、即ち前記給油口キャップ１０の外部へと流出しない。 As described above, in the state where the fuel tank 100 is tilted , the outer peripheral CF of the valve body 22 in the lateral direction is the second side wall 16E of the cylinder body 16 until the predetermined value, for example, 5 kPa is reached . Since the state of point contact with the top of the convex portion 16T or the state of line contact with the inner side surface 16E1 is maintained, the first passage resistance set in the valve portion VA (or the valve portion VB) ( Alternatively, due to the second passage resistance), the fuel in the first space S1 is a gap between the lower side wall of the large diameter portion 23A of the elevating member 23 and the blow-up member 50, the first space S1 (the said). It does not flow out to the outside of the fuel tank 100, that is, to the outside of the fuel filler port cap 10 through the gap 35), the second space S2 (including the first air passage 15), and the opening S3.

従って、前記燃料タンク１００が傾斜して前記燃料タンク１００から燃料が流入した場合に、前記燃料の前記燃料タンク１００外部への放出を抑制し、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Therefore, when the fuel tank 100 is tilted and fuel flows in from the fuel tank 100, the release of the fuel to the outside of the fuel tank 100 is suppressed, and the valve mechanism portion has a function as a safety valve. It is possible to improve fuel efficiency and prevent environmental pollution.

また同じく前記燃料タンク１００が傾斜した状態で、前記燃料タンク１００からの前記燃料の圧力（流体圧力）が、例えば５ｋＰａに達した場合には、前記スプリング１７の付勢力に抗して前記昇降部材２３と前記弁体２２を下降させて、前記弁体２２の前記横方向の外周ＣＦと複数条の前記凸部１６Ｔの前記頂部との点接触又は前記内側面１６Ｅ１との線接触を解除し、前記弁部ＶＡ（又は前記弁部ＶＢ）を開放する。このため、設定した圧力に到達して前記燃料タンク内の圧力が高くなり過ぎた場合の安全弁としての機能を果たすことができる。 Similarly, when the pressure (fluid pressure) of the fuel from the fuel tank 100 reaches, for example, 5 kPa while the fuel tank 100 is tilted, the elevating member resists the urging force of the spring 17. 23 and the valve body 22 are lowered to release the point contact between the lateral outer peripheral CF of the valve body 22 and the top of the plurality of protrusions 16T or the line contact with the inner side surface 16E1. The valve portion VA (or the valve portion VB) is opened. Therefore, it can function as a safety valve when the set pressure is reached and the pressure in the fuel tank becomes too high.

なお、前記燃料タンク１００が水平状態（「概ね水平状態」含む。）に復帰した場合には、前記昇降部材２３と前記弁体２２との合計した重量によって、これらが下降して、前記弁体２２は前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１に形成された前記凸部１６Ｔ（又は前記第２側壁１６Ｅの前記内側面１６Ｅ１）には接触せずに、前記弁部ＶＡ（又は前記弁部ＶＢ）は、前記燃料タンク１００内の圧力値に関係なく、開放される。 Incidentally, when said fuel tank 100 is returned to the horizontal state ( "approximately horizontal state" including.), Depending total weight of the elevation member 23 and the valve body 22, and they are lowered, the valve body The valve portion VA (or the valve portion VA ) does not come into contact with the convex portion 16T (or the inner side surface 16E1 of the second side wall 16E) formed on the inner side surface 16E1 of the second side wall 16E of the cylinder body 16. Alternatively, the valve portion VB) is opened regardless of the pressure value in the fuel tank 100.

（６）前記給油口キャップ１０の第３の実施形態
以下の（６−１）及び（６−２）の説明は、前記弁部ＶＡを使用した前記給油口キャップ１０についてのものであるが、前記弁部ＶＢを使用する前記給油口キャップ１０にも適用できる。 (6) Third Embodiment of the Refueling Port Cap 10 The following description of (6-1) and (6-2) is for the refueling port cap 10 using the valve portion VA. It can also be applied to the fuel filler port cap 10 that uses the valve portion VB.

（６−１）前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍未満の実施形態（図２３及び図２４参照）
次に、前記給油口キャップ１０の他の実施形態について、図２３及び図２４に基づいて説明するが、特に図１９乃至図２２に基づく実施形態と異なる構成による作用を中心に説明する。 (6-1) An embodiment in which the urging force of the spring 17 is less than 1.0 times the total weight of the elevating member 23 and the valve body 22 (see FIGS. 23 and 24).
Next, another embodiment of the fuel filler cap 10 will be described with reference to FIGS. 23 and 24, and in particular, an operation having a configuration different from that of the embodiment based on FIGS. 19 to 22 will be mainly described.

先ず、前記フィルター３８の前記中抜き部３８Ａに前記内蓋１３の前記筒本体１６を挿入させた状態で前記外蓋１２内に前記内蓋１３を収納させ、前記内蓋１３と前記外蓋１２とは固定されているものとし、例えば前記昇降部材２３上に前記弁体２２を載置させた状態で、前記筒本体１６の空間内に前記昇降部材２３を収納する。すると、前記昇降部材２３の前記小径部２３Ｂが前記弁体２２を載置した状態で前記第２空間Ｓ２内に入り込むと共に、且つ前記大径部２３Ａが前記第１空間Ｓ１内に入り込むこととなる。 First, the inner lid 13 is housed in the outer lid 12 in a state where the cylinder body 16 of the inner lid 13 is inserted into the hollow portion 38A of the filter 38, and the inner lid 13 and the outer lid 12 are stored. For example, with the valve body 22 mounted on the elevating member 23, the elevating member 23 is housed in the space of the cylinder body 16. Then, the small diameter portion 23B of the elevating member 23 enters the second space S2 with the valve body 22 mounted on it, and the large diameter portion 23A enters the first space S1. ..

次に、前記昇降部材２３の前記空間２３Ｓ内に前記スプリング１７を収納し、前記第２抵抗部材５２の上面を前記吹上部材５０の前記大径部５０Ｃの下面に当接するようにして、前記段差部１６Ｇの下部の前記内蓋１３の前記底壁１３Ａから垂下した中空円筒状の筒１３Ｊ内に前記大径部５０Ｃ及び前記第２抵抗部材５２を収納する。 Next, the spring 17 is housed in the space 23S of the elevating member 23, and the upper surface of the second resistance member 52 is brought into contact with the lower surface of the large diameter portion 50C of the blowing member 50 so that the step is raised. The large diameter portion 50C and the second resistance member 52 are housed in a hollow cylindrical cylinder 13J hanging from the bottom wall 13A of the inner lid 13 below the portion 16G.

そして、小径空間５３Ａ及びこの小径空間５３Ａの下部に連通する大径空間５３Ｂを中央部に備えた円板状の蓋体５３の上面が前記第２抵抗部材５２の下面に当接するように、該蓋体５３の上面に形成された平面視リング状の嵌合溝５３Ｃを前記筒１３Ｊと嵌合させて、前記内蓋１３に前記蓋体５３を取り付ける。 Then, the upper surface of the disc-shaped lid 53 provided with the small-diameter space 53A and the large-diameter space 53B communicating with the lower portion of the small-diameter space 53A in the central portion abuts on the lower surface of the second resistance member 52. A ring-shaped fitting groove 53C formed on the upper surface of the lid 53 is fitted with the cylinder 13J, and the lid 53 is attached to the inner lid 13.

また、前記蓋体５３の前記小径空間５３Ａ内に前記第１抵抗部材５１の前記上部５１Ｂが入り込むように、且つ前記大径空間５３Ｂ内に前記下部５１Ａが収納されるように、前記蓋体５３に前記第１抵抗部材５１が取り付けられる。 Further, the lid body 53 is provided so that the upper portion 51B of the first resistance member 51 enters the small diameter space 53A of the lid body 53 and the lower portion 51A is housed in the large diameter space 53B. The first resistance member 51 is attached to the body.

なお、図１２に示す構造と同様に、前記内蓋１３下部に形成された前記外筒状部１３Ｄの内側面に形成された前記雌ネジ部１３Ｅと、前記給油口９８に形成した前記雄ネジ部とを螺合させることにより、前記給油口９８に前記給油口キャップ１０を取り付ける。 Similar to the structure shown in FIG. 12, the female screw portion 13E formed on the inner side surface of the outer tubular portion 13D formed on the lower portion of the inner lid 13 and the male screw formed on the fuel filler port 98. The refueling port cap 10 is attached to the refueling port 98 by screwing the portion.

なお、以上の図２３及び図２４に示す実施形態における前記弁機構部は、前記筒本体１６、前記昇降部材２３、前記弁体２２、前記スプリング１７、前記吹上部材５０、前記第１抵抗部材５１及び前記第２抵抗部材５２などで構成される。 The valve mechanism portion in the embodiment shown in FIGS. 23 and 24 is the cylinder body 16, the elevating member 23, the valve body 22, the spring 17, the blow-up member 50, and the first resistance member 51. And the second resistance member 52 and the like.

以上の図２３及び図２４に示す実施形態については、前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍未満、例えば０．８倍以上〜０．９３倍以下とし、以下作用について説明する。 In the embodiment shown in FIGS. 23 and 24, the urging force of the spring 17 is less than 1.0 times the total weight of the elevating member 23 and the valve body 22, for example, 0.8 times or more to 0. It is set to .93 times or less, and the action will be described below.

この０．８倍以上〜０．９３倍以下とした実施形態にあっては、前記燃料タンク１００が概ね水平状態にあれば、前記燃料タンク１００内の圧力値に関係なく、図２３に示すように、前記昇降部材２３と前記弁体２２は、前記弁体２２と前記昇降部材２３との合計重量未満の付勢力で前記スプリング１７が圧縮された状態で、下降している。 In this embodiment of 0.8 times or more and 0.93 times or less, if the fuel tank 100 is in a substantially horizontal state, as shown in FIG. 23, regardless of the pressure value in the fuel tank 100. In addition, the elevating member 23 and the valve body 22 are lowered in a state where the spring 17 is compressed by an urging force less than the total weight of the valve body 22 and the elevating member 23.

従って、前記弁体２２は前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１に形成された前記凸部１６Ｔ（又は前記第２側壁１６Ｅの前記内側面１６Ｅ１）には接触せずに、前記弁部ＶＡ（又は前記弁部ＶＢ）は開放している。 Therefore, the valve body 22 does not come into contact with the convex portion 16T (or the inner side surface 16E1 of the second side wall 16E) formed on the inner side surface 16E1 of the second side wall 16E of the cylinder body 16. The valve portion VA (or the valve portion VB) is open.

しかし、前記燃料タンク１００が傾斜した場合には、傾斜角度が９０度になるまでは、この傾斜角度に応じて前記昇降部材２３と前記弁体２２との前記スプリング１７に掛かる重量が減少し、前記スプリング１７はその伸長する長さが増すこととなる。従って、前記スプリング１７に掛かる重量が減少するに伴って、前記スプリング１７の付勢力により前記弁体２２は押し上げられ、やがて前記スプリング１７の長さが所定の長さになると、前記弁体２２は前記筒本体１６の前記第２側壁１６Ｅの前記凸部１６Ｔ（又は前記第２側壁１６Ｅの前記内側面１６Ｅ１）に接触することとなる。 However, when the fuel tank 100 is tilted, the weight of the elevating member 23 and the valve body 22 on the spring 17 is reduced according to the tilt angle until the tilt angle is 90 degrees. The length of the spring 17 that extends is increased. Therefore, as the weight applied to the spring 17 decreases, the valve body 22 is pushed up by the urging force of the spring 17, and when the length of the spring 17 eventually reaches a predetermined length, the valve body 22 becomes. It comes into contact with the convex portion 16T (or the inner side surface 16E1 of the second side wall 16E) of the second side wall 16E of the cylinder body 16.

このため、図２４に示すように、前記燃料タンク１００が傾斜した場合には、前記第１抵抗部材５１の前記溝５１Ｄを介する前記燃料は前記連通口５１Ｅで減圧された後、前記溝５１Ｃを経て前記蓋体５３の前記小径空間５３Ａ内に入り込むが、前記第１抵抗部材５１の前記上部５１Ｂにより前記上部５１Ｂの周囲の前記小径空間５３Ａを通過する前記燃料の圧力も減少され、更に前記溝５２Ｂを介する前記燃料は前記連通口５２Ｃで減圧された後、前記溝５２Ａ、前記吹上部材５０の前記大径空間５０Ｓ２を経て、前記小径空間５０Ｓ１から前記昇降部材２３の前記空間２３Ｓ内に噴出する。このため、前記スプリング１７の付勢力と相俟って、前記昇降部材２３と前記弁体２２を素早く押し上げて、前記弁体２２の前記横方向の外周ＣＦが前記凸部１６Ｔの前記頂部に押圧されて点接触する（又は前記横方向の外周ＣＦが前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触する）。 Therefore, as shown in FIG. 24, when the fuel tank 100 is tilted, the fuel through the groove 51D of the first resistance member 51 is depressurized at the communication port 51E, and then the groove 51C is formed. Through the small diameter space 53A of the lid 53, the pressure of the fuel passing through the small diameter space 53A around the upper portion 51B is also reduced by the upper portion 51B of the first resistance member 51, and further, the groove. The fuel via the 52B is depressurized at the communication port 52C, and then is ejected from the small diameter space 50S1 into the space 23S of the elevating member 23 through the groove 52A and the large diameter space 50S2 of the blowing member 50. .. Therefore, in combination with the urging force of the spring 17, the elevating member 23 and the valve body 22 are quickly pushed up, and the lateral outer peripheral CF of the valve body 22 presses against the top of the convex portion 16T. It has been in contact points (or the outer peripheral CF of the lateral line contact with the inner surface 16E1 of the second side wall 16E).

以上のように、前記燃料タンク１００が傾斜した状態において、例えば５ｋＰａに達するまでは、前記弁体２２の前記横方向の外周ＣＦが前記凸部１６Ｔの前記頂部に押圧されて点接触する（又は前記横方向の外周ＣＦが前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触する）ため、前記弁部ＶＡ（又は前記弁部ＶＢ）に設定された前記第１通路抵抗（又は前記第２通路抵抗）により、前記第１空間Ｓ１内の前記燃料は、前記昇降部材２３の前記大径部２３Ａの前記側壁下部と前記吹上部材５０との隙間、前記第１空間Ｓ１（前記隙間３５）、前記第２空間Ｓ２（前記第１空気通路１５又は第２空気通路１５Ａを含む。）、前記開口Ｓ３を介して前記燃料タンク１００の外部、即ち前記給油口キャップ１０の外部へと流出しない。 As described above, in the state where the fuel tank 100 is tilted , the outer peripheral CF in the lateral direction of the valve body 22 is pressed against the top of the convex portion 16T and makes point contact (or until it reaches, for example, 5 kPa). Since the outer peripheral CF in the lateral direction makes line contact with the inner side surface 16E1 of the second side wall 16E ), the first passage resistance (or the second passage) set in the valve portion VA (or the valve portion VB). Due to the resistance), the fuel in the first space S1 is the gap between the lower side wall of the large diameter portion 23A of the elevating member 23 and the blow-up member 50, the first space S1 (the gap 35), and the said. It does not flow out to the outside of the fuel tank 100, that is, to the outside of the fuel filler port cap 10 through the second space S2 (including the first air passage 15 or the second air passage 15A) and the opening S3.

従って、前記燃料の前記燃料タンク１００外部への放出を抑制し、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Therefore, it is possible to suppress the release of the fuel to the outside of the fuel tank 100, and the valve mechanism portion has a function as a safety valve, which can improve fuel efficiency and prevent environmental pollution.

また同じく前記燃料タンク１００が傾斜した状態で、前記燃料タンク１００からの前記燃料の圧力（流体圧力）が、例えば５ｋＰａに達した場合には、前記スプリング１７の付勢力に抗して前記昇降部材２３と前記弁体２２を下降させて、前記弁体２２の前記横方向の外周ＣＦと前記凸部１６Ｔの前記頂部との点接触（又は前記横方向の外周ＣＦと前記第２側壁１６Ｅの前記内側面１６Ｅ１との線接触）を解除して、前記弁部ＶＡ（又は前記弁部ＶＢ）を開放する。 Similarly, when the pressure (fluid pressure) of the fuel from the fuel tank 100 reaches, for example, 5 kPa while the fuel tank 100 is tilted, the elevating member resists the urging force of the spring 17. The 23 and the valve body 22 are lowered to make point contact between the lateral outer peripheral CF of the valve body 22 and the top of the convex portion 16T (or the lateral outer peripheral CF and the second side wall 16E. The line contact with the inner side surface 16E1) is released, and the valve portion VA (or the valve portion VB) is opened .

なお、前記燃料タンク１００が水平状態（「概ね水平状態」含む。）に復帰した場合には、前記昇降部材２３と前記弁体２２との合計した重量によって、これらが下降して、前記弁部ＶＡ（又は前記弁部ＶＢ）は、前記燃料タンク１００内の圧力値に関係なく、前記弁体２２の前記横方向の外周ＣＦは前記凸部１６Ｔの前記頂部に点接触（又は前記横方向の外周ＣＦが前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触）せずに、開放される。 When the fuel tank 100 returns to the horizontal state (including the "generally horizontal state"), the fuel tank 100 is lowered by the total weight of the elevating member 23 and the valve body 22, and the valve portion In the VA (or the valve portion VB), the lateral outer peripheral CF of the valve body 22 makes point contact (or the lateral direction) with the top of the convex portion 16T regardless of the pressure value in the fuel tank 100. The outer peripheral CF is opened without line contact with the inner side surface 16E1 of the second side wall 16E .

（６−２）前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍以上の実施形態（図２３参照）
次に、図２３に示すような構造であるが、前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍以上、例えば１．１以上〜２．０倍以下とした実施形態について、前記給油口キャップ１０の作用について説明する。 (6-2) An embodiment in which the urging force of the spring 17 is 1.0 times or more the total weight of the elevating member 23 and the valve body 22 (see FIG. 23).
Next, although the structure is as shown in FIG. 23, the urging force of the spring 17 is 1.0 times or more the total weight of the elevating member 23 and the valve body 22, for example, 1.1 or more to 2. The operation of the fuel filler port cap 10 will be described with respect to the embodiment set to 0 times or less.

先ず、前記燃料タンク１００が概ね水平状態にあって、前記エンジン９９の停止中において、外気温度が上昇して、前記燃料タンク１００内の内圧が高まっても、前記燃料タンク１００内の前記内圧が、例えば５ｋＰａ未満であれば、前記弁体２２の前記横方向の外周ＣＦが前記凸部１６Ｔの前記頂部に前記スプリング１７の付勢力により押圧されて点接触して（又は前記横方向の外周ＣＦが前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触して）、前記弁部ＶＡ（又は前記弁部ＶＢ）に設定された前記第１通路抵抗（又は前記第２通路抵抗）により、前記第１空間Ｓ１内の前記ＶＯＣガス又は前記燃料は前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００外部、即ち前記給油口キャップ１０外部へ放出されない。 First, even if the fuel tank 100 is in a substantially horizontal state and the outside air temperature rises and the internal pressure in the fuel tank 100 increases while the engine 99 is stopped, the internal pressure in the fuel tank 100 remains. For example, if it is less than 5 kPa, the lateral outer peripheral CF of the valve body 22 is pressed against the top of the convex portion 16T by the urging force of the spring 17 and makes point contact (or the lateral outer peripheral CF). There contact lines the inner surface 16E1 of the second side wall 16E) by the valve unit VA (or the valve unit VB) to set the first flow resistance (or the second passage resistance), the first The VOC gas or the fuel in the space S1 is not discharged to the outside of the fuel tank 100, that is, to the outside of the fuel filler port cap 10 through the second space S2 and the opening S3.

このとき、前記第１抵抗部材５１には前記連通口５１Ｅが形成され、前記蓋体５３の前記小径空間５３Ａ内の前記第１抵抗部材５１の円柱状の前記上部５１Ｂが存在し、前記第２抵抗部材５２には前記連通口５２Ｃが形成されて、通路抵抗が増加されるので、前記筒本体１６内に流入する前記ＶＯＣガス又は前記燃料の圧力を減少させるので、前記ＶＯＣガス又は前記燃料の前記燃料タンク１００外部の放出を抑制する。 At this time, the communication port 51E is formed in the first resistance member 51, and the columnar upper portion 51B of the first resistance member 51 in the small diameter space 53A of the lid 53 is present. Since the communication port 52C is formed in the resistance member 52 and the passage resistance is increased, the pressure of the VOC gas or the fuel flowing into the cylinder body 16 is reduced, so that the VOC gas or the fuel The release from the outside of the fuel tank 100 is suppressed.

このため、前記燃料から蒸発した有害な前記ＶＯＣガス又は前記燃料を前記自動車１０１外部に放出させないので、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Therefore, since the harmful VOC gas or the fuel evaporated from the fuel is not released to the outside of the automobile 101, the valve mechanism portion has a function as a safety valve, and can improve fuel efficiency and the environment. Contamination can be prevented.

そして、同じく前記エンジン９９の停止中において、外気温度の更なる上昇に伴って、前記ＶＯＣガスの発生量が更に増大して、又は前記燃料タンク１００内が前記燃料の満タン状態かこれに近い状態下で前記燃料が膨張して、前記燃料タンク１００内の圧力が更に高まって、例えば５ｋＰａに達すると、前記燃料タンク１００からの前記ＶＯＣガス又は前記燃料は、前記第１抵抗部材５１の前記溝５１Ｄ、前記連通口５１Ｅ及び前記溝５１Ｃ、前記上部５１Ｂの周囲の前記小径空間５３Ａ、前記第２抵抗部材５２の前記溝５２Ｂ、前記連通口５２Ｃ及び前記溝５２Ａ、前記吹上部材５０の前記大径空間５０Ｓ２及び前記小径空間５０Ｓ１を経て前記昇降部材２３の前記空間２３Ｓに入り込んで、更に前記昇降部材２３の前記大径部２３Ａの前記側壁下部と前記吹上部材５０との隙間、前記第１空間Ｓ１（前記隙間３５）、前記第２空間Ｓ２（前記第１空気通路１５又は前記第２空気通路１５Ａを含む。）、前記開口Ｓ３、前記空間１２Ｓ、前記空間４４、前記空気通路４３、前記隙間４０を介して、前記給油口キャップ１０を介して前記自動車１０１外部に放出されることとなる。 Similarly, while the engine 99 is stopped, the amount of VOC gas generated further increases with the further rise in the outside air temperature, or the inside of the fuel tank 100 is at or near the full state of the fuel. When the fuel expands under the condition and the pressure in the fuel tank 100 further increases to reach, for example, 5 kPa, the VOC gas or the fuel from the fuel tank 100 becomes the said of the first resistance member 51. The groove 51D, the communication port 51E and the groove 51C, the small diameter space 53A around the upper portion 51B, the groove 52B of the second resistance member 52, the communication port 52C and the groove 52A, and the large size of the blow-up member 50. It enters the space 23S of the elevating member 23 through the diameter space 50S2 and the small diameter space 50S1, and further, a gap between the lower side wall of the large diameter portion 23A of the elevating member 23 and the blow-up member 50, the first space. S1 (the gap 35), the second space S2 (including the first air passage 15 or the second air passage 15A), the opening S3, the space 12S, the space 44, the air passage 43, the gap. It will be discharged to the outside of the automobile 101 via the fuel filler port cap 10 via the 40.

即ち、前記第２側壁１６Ｅに形成された前記第１空気通路１５（又は前記第２空気通路１５Ａ）内を高圧の前記ＶＯＣガス又は膨張した前記燃料が前記弁部ＶＡ（又は前記弁部ＶＢ）に設定された前記第１通路抵抗（又は前記第２通路抵抗）に抗して上昇して、前記弁部ＶＡ（又は前記弁部ＶＢ）を通過する。このため、前記弁部ＶＡ（又は前記弁部ＶＢ）を通過して斜め上方に向けて上昇する前記ＶＯＣガス又は前記燃料が円錐台形状の前記第２空間Ｓ２内で斜め上方から下方へ前記弁体２２を押し下げるように作用する。 That is, the high-pressure VOC gas or the expanded fuel in the first air passage 15 (or the second air passage 15A) formed on the second side wall 16E is the valve portion VA (or the valve portion VB). It rises against the first passage resistance (or the second passage resistance) set in the above and passes through the valve portion VA (or the valve portion VB). Therefore, the VOC gas or the fuel that passes through the valve portion VA (or the valve portion VB) and rises diagonally upward is the valve from diagonally upward to downward in the truncated cone-shaped second space S2. It acts to push down the body 22.

従って、前記ＶＯＣガス又は前記燃料により、前記スプリング１７の付勢力に抗して前記昇降部材２３の前記大径部２３Ａの前記側壁下部が前記吹上部材５０の前記大径部５０Ｃの上面に当接するまで、前記弁体２２及び前記昇降部材２３が下降して、前記弁体２２の前記横方向の外周ＣＦと前記凸部１６Ｔの前記頂部との点接触（又は前記横方向の外周ＣＦと前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触）が解除され、前記弁部ＶＡ（又は前記弁部ＶＢ）を開放する（図２３参照）。 Therefore, the lower side wall of the large diameter portion 23A of the elevating member 23 abuts on the upper surface of the large diameter portion 50C of the blow-up member 50 against the urging force of the spring 17 by the VOC gas or the fuel. The valve body 22 and the elevating member 23 are lowered until the point contact between the lateral outer peripheral CF of the valve body 22 and the top of the convex portion 16T (or the lateral outer peripheral CF and the first (Linear contact with the inner side surface 16E1 of the side wall 16E) is released, and the valve portion VA (or the valve portion VB) is opened (see FIG. 23).

このため、前記燃料タンク１００内の圧力が、５ｋＰａに達して、上述したように、前記弁部ＶＡ（又は前記弁部ＶＢ）を開放すると、前記燃料タンク１００内の過大な圧力（前記ＶＯＣガスや前記燃料を含む。）は、前記給油口キャップ１０を介して前記自動車１０１外部に放出されることとなる。 Therefore, when the pressure in the fuel tank 100 reaches 5 kPa and the valve portion VA (or the valve portion VB) is opened as described above, the excessive pressure in the fuel tank 100 (the VOC gas) And the fuel.) Will be released to the outside of the automobile 101 through the fuel filler port cap 10.

すると、この放出により前記燃料タンク１００の内の圧力は直ちに５ｋＰａ未満の圧力の状態になり、前記スプリング１７の付勢力により前記昇降部材２３及び前記弁体２２が上昇して、前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部１６Ｔの前記頂部と点接触する（又は同じく前記横方向の外周ＣＦが前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触する。）。従って、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Then, due to this release, the pressure inside the fuel tank 100 immediately becomes a pressure of less than 5 kPa, and the elevating member 23 and the valve body 22 rise due to the urging force of the spring 17, and the valve body 22 The outer peripheral CF in the lateral direction makes point contact with the top of the convex portion 16T having a plurality of rows (or the outer peripheral CF in the lateral direction also makes line contact with the inner side surface 16E1 of the second side wall 16E ). Therefore, the valve mechanism portion has a function as a safety valve, can improve fuel efficiency, and can prevent environmental pollution.

即ち、前記弁部ＶＡ（又は前記弁部ＶＢ）の開放圧力を、例えば５ｋＰａに設定した場合において、前記燃料タンク１００が傾斜しても、前記燃料タンク１００内の圧力が５ｋＰａ未満であれば、前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部１６Ｔの前記頂部と点接触した状態（又は同じく前記横方向の外周ＣＦが前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触した状態）を維持する。従って、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 That is, when the opening pressure of the valve portion VA (or the valve portion VB) is set to, for example, 5 kPa, even if the fuel tank 100 is tilted, if the pressure in the fuel tank 100 is less than 5 kPa, A state in which the lateral outer peripheral CF of the valve body 22 is in point contact with the top of the convex portion 16T having a plurality of rows (or the lateral outer peripheral CF is also in line contact with the inner side surface 16E1 of the second side wall 16E. (In the state of being) is maintained. Therefore, the valve mechanism portion has a function as a safety valve, can improve fuel efficiency, and can prevent environmental pollution.

また、前記燃料タンク１００が傾斜した際に、例えば５ｋＰａ以上の圧力の前記ＶＯＣガス又は前記燃料が前記筒本体１６内に流入したとき、前記弁体２２が前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１に突出した複数条の前記凸部１６Ｔの前記頂部に点接触している状態（又は前記内側面１６Ｅ１に線接触している状態）から前記弁体２２は前記昇降部材２３の下降ストローク分下方に落下し、前記燃料タンク１００内の前記ＶＯＣガスや前記燃料は前記給油口キャップ１０を介して前記自動車１０１外部へ放出される。 Further, when the fuel tank 100 is tilted, for example, when the VOC gas having a pressure of 5 kPa or more or the fuel flows into the cylinder body 16, the valve body 22 causes the second side wall 16E of the cylinder body 16. From the state of point contact with the top of the convex portion 16T having a plurality of strips protruding from the inner side surface 16E1 (or the state of line contact with the inner side surface 16E1), the valve body 22 is of the elevating member 23. It falls downward by the amount of the descending stroke, and the VOC gas and the fuel in the fuel tank 100 are discharged to the outside of the automobile 101 through the fuel filler port cap 10.

なお、（６）の実施形態においては、前記第２抵抗部材５２を使用するが、前記第１抵抗部材５１は必ずしも使用しなくともよい。 In the embodiment of (6), the second resistance member 52 is used, but the first resistance member 51 does not necessarily have to be used.

（７）弁機構体６０の第１の実施形態（図１乃至図２５参照）
以下の（７−１）及び（７−２）の説明は、前記弁部ＶＡを使用した前記弁機構体６０についてのものであるが、前記弁部ＶＢを使用する前記弁機構体６０にも適用できる。 (7) The first embodiment of the valve mechanism 60 (see FIGS. 1 to 25).
The following description of (7-1) and (7-2) is for the valve mechanism 60 using the valve portion VA, but the valve mechanism 60 using the valve portion VB is also described below. Applicable.

（７−１）前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍以上とした実施形態（図１乃至図２５参照）
以上の図１乃至図２４に示す全ての実施形態は、前記自動車１０１の概略図を示す図１に示す前記給油口キャップ１０についてのものであるが、この給油口キャップ１０と同一の構造のものを前記弁機構体６０として使用することもでき（図２５参照）、以下説明する。 (7-1) An embodiment in which the urging force of the spring 17 is 1.0 times or more the total weight of the elevating member 23 and the valve body 22 (see FIGS. 1 to 25).
All of the above embodiments shown in FIGS. 1 to 24 are for the fuel filler cap 10 shown in FIG. 1 showing a schematic view of the automobile 101, but have the same structure as the fuel filler cap 10. Can also be used as the valve mechanism 60 (see FIG. 25), which will be described below.

先ず、図２５に示すように、前記給油口キャップ１０とは異なる給油口キャップ６１は、前記燃料タンク１００に燃料としてのガソリンＧを注入する際に、前記燃料タンク１００の上面に設けられた給油口を開閉するものである。 First, as shown in FIG. 25, the fuel filler port cap 61, which is different from the fuel filler port cap 10, is provided on the upper surface of the fuel tank 100 when the gasoline G as the fuel is injected into the fuel tank 100. It opens and closes the mouth.

即ち、前記給油口を介して前記燃料タンク１００内部と大気とは連通し、前記給油口キャップ６１を開いて前記燃料タンク１００内にガソリンＧを注入でき、前記給油口キャップ６１を閉めると、前記給油口を介する大気との前記連通は遮断される。 That is, the inside of the fuel tank 100 and the atmosphere are communicated with each other through the fuel tank 100, the fuel tank cap 61 can be opened to inject gasoline G into the fuel tank 100, and when the fuel tank cap 61 is closed, the fuel tank cap 61 is closed. The communication with the atmosphere through the fuel filler port is cut off.

また、図１乃至図２４に基づいて説明した前記給油口キャップ１０と同一の構造の前記弁機構体６０を、前記燃料タンク１００の上面に設ける。そして、前述した給油口キャップ６１と前記弁機構体６０とで、前記燃料タンク１００の弁体装置を構成する。６２はポンプで、前記燃料タンク１００内の前記ガソリンＧを配管６３を介して前記エンジン９９に供給する。 Further, the valve mechanism 60 having the same structure as the fuel filler cap 10 described with reference to FIGS. 1 to 24 is provided on the upper surface of the fuel tank 100. Then, the fuel filler port cap 61 and the valve mechanism 60 described above constitute a valve body device of the fuel tank 100. Reference numeral 62 denotes a pump, which supplies the gasoline G in the fuel tank 100 to the engine 99 via the pipe 63.

以上のように、構成することにより、先ず前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍以上、例えば１．１以上〜２．０倍以下とした場合について、前記弁機構体６０の作用について説明する。 As described above, the urging force of the spring 17 is 1.0 times or more, for example, 1.1 or more to 2.0 times or less the total weight of the elevating member 23 and the valve body 22. The operation of the valve mechanism 60 will be described.

初めに、前記燃料タンク１００が概ね水平状態又は傾斜した状態において、前記エンジン９９の停止中において、外気温度が上昇して、前記燃料タンク１００内の内圧が高まっても、前記燃料タンク１００内の前記内圧が、例えば５ｋＰａ未満であれば、前述したように、前記弁体２２の前記横方向の外周ＣＦが前記凸部１６Ｔの前記頂部に前記スプリング１７の付勢力により押圧されて点接触して（又は同じく前記横方向の外周ＣＦが前記第２側壁１６Ｅの前記内側面１６Ｅ１に線接触して）、前記弁部ＶＡ（又は前記弁部ＶＢ）に設定された前記第１通路抵抗（又は前記第２通路抵抗）により前記第１空間Ｓ１内の前記ＶＯＣガス又は前記燃料は前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００外部、即ち前記弁機構体６０外部へ放出されない。 First, in a state where the fuel tank 100 is substantially horizontal or tilted, even if the outside air temperature rises and the internal pressure in the fuel tank 100 increases while the engine 99 is stopped, the inside of the fuel tank 100 If the internal pressure is, for example, less than 5 kPa, as described above, the lateral outer peripheral CF of the valve body 22 is pressed against the top of the convex portion 16T by the urging force of the spring 17 to make point contact. (or also the lateral periphery CF is in line contact with the inner surface 16E1 of the second side wall 16E of), the valve unit VA (or the valve unit VB) the set to a first flow resistance (or the Due to the second passage resistance), the VOC gas or the fuel in the first space S1 is not discharged to the outside of the fuel tank 100, that is, the outside of the valve mechanism 60 through the second space S2 and the opening S3.

同じく前記燃料タンク１００が概ね水平状態又は傾斜した状態において、前記エンジン９９の停止中において、外気温度の更なる上昇に伴って、前記ＶＯＣガスの発生量が更に増大して、又は前記燃料タンク１００内が前記燃料の満タン状態かこれに近い状態下で前記燃料が膨張して、前記燃料タンク１００内の圧力が更に高まって、例えば５ｋＰａに達すると、前記燃料タンク１００からの前記ＶＯＣガス又は前記燃料は、前記筒本体１６の前記第２側壁１６Ｅに形成された前記第１空気通路１５（又は前記第２空気通路１５Ａ）内を前記ＶＯＣガス又は前記燃料が上昇して、前記弁部ＶＡ（又は前記弁部ＶＢ）を通過し、この斜め上方に向けて上昇する前記ＶＯＣガス又は前記燃料が前記弁体２２を円錐台形状の前記第２空間Ｓ２内で斜め上方から下方へ押し下げ、前記燃料タンク１００外部に過大な圧力を放出する。 Similarly, when the fuel tank 100 is substantially horizontal or tilted, and the engine 99 is stopped, the amount of VOC gas generated further increases as the outside air temperature further rises, or the fuel tank 100 is generated. When the fuel expands and the pressure in the fuel tank 100 further increases, for example, reaches 5 kPa when the inside is full or close to the fuel, the VOC gas from the fuel tank 100 or the VOC gas or The fuel is the VOC gas or the fuel rising in the first air passage 15 (or the second air passage 15A) formed in the second side wall 16E of the cylinder body 16, and the valve portion VA. (or the valve unit VB) passes through, the depressing said VOC gas or the fuel rises obliquely upward of the valve body 22 obliquely from above in the frustoconical inner second space S2 downwards, the Excessive pressure is released to the outside of the fuel tank 100.

（７−２）前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍未満とした実施形態（図１乃至図２５参照）
次に、前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍未満、例えば０．８倍以上〜０．９３倍以下とした場合について、前記弁機構体６０の作用について説明する。 (7-2) An embodiment in which the urging force of the spring 17 is less than 1.0 times the total weight of the elevating member 23 and the valve body 22 (see FIGS. 1 to 25).
Next, when the urging force of the spring 17 is less than 1.0 times the total weight of the elevating member 23 and the valve body 22, for example, 0.8 times or more and 0.93 times or less, the valve. The operation of the mechanism 60 will be described.

この０．８倍以上〜０．９３倍以下とした実施形態にあっては、前記燃料タンク１００が概ね水平状態にあれば、前記燃料タンク１００内の圧力値に関係なく、前記昇降部材２３と前記弁体２２は、前記弁体２２と前記昇降部材２３との合計重量未満の付勢力で前記スプリング１７が圧縮された状態で、下降している。従って、前記弁体２２は前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１に形成した前記凸部１６Ｔ（又は前記内側面１６Ｅ１）には接触せずに、前記弁部ＶＡ（又は前記弁部ＶＢ）は開放している。 In the embodiment set to 0.8 times or more and 0.93 times or less, if the fuel tank 100 is in a substantially horizontal state, the elevating member 23 and the elevating member 23 regardless of the pressure value in the fuel tank 100. The valve body 22 is lowered in a state where the spring 17 is compressed by an urging force less than the total weight of the valve body 22 and the elevating member 23. Therefore, the valve body 22 does not come into contact with the convex portion 16T (or the inner side surface 16E1) formed on the inner side surface 16E1 of the second side wall 16E of the cylinder body 16, and the valve portion VA (or the valve portion VA) (or the said The valve part VB) is open.

しかし、前記燃料タンク１００が傾斜した場合には、傾斜角度が９０度になるまでは、傾斜角度に応じて前記昇降部材２３及び前記弁体２２との前記スプリング１７に掛かる重量が減少し、前記燃料タンク１００の水平時に圧縮していた前記スプリング１７は前記傾斜角度が大きくなるに従い伸長する長さが増すこととなる。従って、前記スプリング１７に掛かる重量が減少するに伴って、前記スプリング１７の付勢力により前記弁体２２は押し上げられ、やがて前記スプリング１７の長さが所定の長さになると、前記弁体２２の前記横方向の外周ＣＦが前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１に形成した前記凸部１６Ｔの前記頂部に押圧されて点接触（又は前記内側面１６Ｅ１に線接触）することとなる。 However, when the fuel tank 100 is tilted, the weight applied to the spring 17 with the elevating member 23 and the valve body 22 decreases according to the tilt angle until the tilt angle reaches 90 degrees. The spring 17 that has been compressed when the fuel tank 100 is horizontal increases in length as the inclination angle increases. Therefore, as the weight applied to the spring 17 decreases, the valve body 22 is pushed up by the urging force of the spring 17, and when the length of the spring 17 reaches a predetermined length, the valve body 22 The outer peripheral CF in the lateral direction is pressed against the top of the convex portion 16T formed on the inner side surface 16E1 of the second side wall 16E of the cylinder body 16 to make point contact (or line contact with the inner side surface 16E1). It becomes.

このため、前記燃料タンク１００が傾斜した場合には、前述したように、例えば５ｋＰａに達するまでは、前記燃料が前記昇降部材２３内に流入して前記昇降部材２３内の圧力を高めて、前記スプリング１７の付勢力と相俟って、前記昇降部材２３と前記弁体２２を押し上げて、前記弁体２２の前記横方向の外周ＣＦが前記筒本体１６の前記第２側壁１６Ｅの前記内側面１６Ｅ１に形成した前記凸部１６Ｔの前記頂部に押圧されて点接触し（又は前記内側面１６Ｅ１に線接触し）、前記弁部ＶＡ（又は前記弁部ＶＢ）に設定された前記第１通路抵抗（又は前記第２通路抵抗）により、前記第１空間Ｓ１内の前記燃料は前記第２空間Ｓ２及び前記開口Ｓ３を介して前記燃料タンク１００の外部、即ち前記弁機構体６０の外部へと流れない。 Therefore, when the fuel tank 100 is tilted, as described above, the fuel flows into the elevating member 23 to increase the pressure in the elevating member 23 until the fuel tank 100 reaches, for example, 5 kPa. Together with the urging force of the spring 17, the elevating member 23 and the valve body 22 are pushed up, and the lateral outer peripheral CF of the valve body 22 is the inner surface of the second side wall 16E of the cylinder body 16. The first passage resistance set on the valve portion VA (or the valve portion VB) by being pressed against the top of the convex portion 16T formed on the 16E1 and making point contact (or line contact with the inner side surface 16E1) . (Or the second passage resistance) causes the fuel in the first space S1 to flow to the outside of the fuel tank 100, that is, to the outside of the valve mechanism 60 through the second space S2 and the opening S3. Absent.

従って、前記燃料の前記燃料タンク１００外部への放出を抑制し、前記弁機構体６０の前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Therefore, the release of the fuel to the outside of the fuel tank 100 is suppressed, and the valve mechanism portion of the valve mechanism 60 has a function as a safety valve, which can improve fuel efficiency and prevent environmental pollution. can do.

また同じく前記燃料タンク１００が傾斜した状態で、前記燃料タンク１００からの前記燃料の圧力（流体圧力）が、例えば５ｋＰａに達した場合には、前記スプリング１７の付勢力に抗して前記昇降部材２３と前記弁体２２を円錐台形状の前記第２空間Ｓ２内で斜め上方から下方へ下降させて、前記弁体２２の前記横方向の外周ＣＦと前記筒本体１６の前記凸部１６Ｔの前記頂部との点接触（又は前記内側面１６Ｅ１との線接触）を解除し、前記弁部ＶＡ（又は前記弁部ＶＢ）を開放する。 Similarly, when the pressure (fluid pressure) of the fuel from the fuel tank 100 reaches, for example, 5 kPa while the fuel tank 100 is tilted, the elevating member resists the urging force of the spring 17. The 23 and the valve body 22 are lowered from diagonally above to downward in the truncated cone-shaped second space S2, and the lateral outer peripheral CF of the valve body 22 and the convex portion 16T of the cylinder body 16 are said to be. The point contact with the top (or the line contact with the inner surface 16E1) is released, and the valve portion VA (or the valve portion VB) is opened .

なお、前記燃料タンク１００が水平状態（「概ね水平状態」含む。）に復帰した場合には、前記昇降部材２３と前記弁体２２との合計した重量によって、これらが下降して、前記弁部ＶＡ（又は前記弁部ＶＢ）は、前記弁体２２の前記横方向の外周ＣＦと前記筒本体１６の前記凸部１６Ｔの前記頂部との点接触せずに（又は前記内側面１６Ｅ１に線接触せずに）、前記燃料タンク１００内の圧力値に関係なく、開放される。 When the fuel tank 100 returns to the horizontal state (including the "generally horizontal state"), the fuel tank 100 is lowered by the total weight of the elevating member 23 and the valve body 22, and the valve portion The VA (or the valve portion VB) does not make point contact between the lateral outer peripheral CF of the valve body 22 and the top of the convex portion 16T of the cylinder body 16 (or line contact with the inner side surface 16E1). Without) , it is opened regardless of the pressure value in the fuel tank 100.

（８）弁機構体６０の第２の実施形態（図２６乃至図２９参照）
次に、図２６乃至図２９に基づいて、給油口キャップ６１と前記弁機構体６０とで前記燃料タンク１００の弁体装置を構成する場合（図２５参照）の、前記弁機構体６０の第２の実施形態について、以下説明する。但し、図１９で示した前記弁体２２、前記昇降部材２３、前記スプリング１７、前記吹上部材５０及び前記第１抵抗部材５１は、図２６においては省略してあるが、前記弁機構体６０には使用する。 (8) A second embodiment of the valve mechanism 60 (see FIGS. 26 to 29).
Next, based on FIGS. 26 to 29, when the valve body device of the fuel tank 100 is configured by the fuel filler port cap 61 and the valve mechanism 60 (see FIG. 25), the valve mechanism 60 is the first. The second embodiment will be described below. However, although the valve body 22, the elevating member 23, the spring 17, the blow-up member 50, and the first resistance member 51 shown in FIG. 19 are omitted in FIG. 26, the valve mechanism 60 Use.

（８−１）前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍未満とした実施形態（図２６乃至図２８参照）
以下の図２６乃至図２８に示す実施形態については、前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量が、１．０倍未満、例えば０．８倍以上〜０．９３倍以下であり、以下説明する。 (8-1) An embodiment in which the urging force of the spring 17 is less than 1.0 times the total weight of the elevating member 23 and the valve body 22 (see FIGS. 26 to 28).
In the embodiments shown in FIGS. 26 to 28 below, the total weight of the elevating member 23 and the valve body 22 is less than 1.0 times, for example, 0.8 times or more as the urging force of the spring 17. It is 0.93 times or less, and will be described below.

７０は筒本体で、前記弁体２２や前記昇降部材２３を収納する内筒本体部７１と、上端部には前記流体が通過できるように全周に亘って外側を切除して薄肉とした切除部７２Ａを形成すると共に４か所切除されて開口７２Ｂが形成された中空円筒状の外筒本体部７２と、前記内筒本体部７１と前記外筒本体部７２とを連結する連結部７３と、前記外筒本体部７２の下端部に該連結部７３とは下方へと段差を有して外方へと延びた取付部７４とを備えている。従って、前記内筒本体部７１は、前記外筒本体部７２の略中心位置に前記外筒本体部７２の下部と前記連結部７３を介して連結する。 Reference numeral 70 denotes a cylinder main body, which is an inner cylinder main body 71 for accommodating the valve body 22 and the elevating member 23, and a thin cut portion on the upper end portion by cutting the outside over the entire circumference so that the fluid can pass therethrough. A hollow cylindrical outer cylinder main body 72 having a portion 72A formed and an opening 72B formed by cutting at four places, and a connecting portion 73 connecting the inner cylinder main body 71 and the outer cylinder main body 72. The lower end of the outer cylinder main body 72 is provided with a mounting portion 74 having a step downward from the connecting portion 73 and extending outward. Therefore, the inner cylinder main body 71 is connected to the lower portion of the outer cylinder main body 72 at a substantially central position of the outer cylinder main body 72 via the connecting portion 73.

前記内筒本体部７１は円筒状の第１側壁７１Ｃと、該第１側壁７１Ｃの上部において内側に設けられる下水平壁７１Ｄと、該下水平壁７１Ｄの上部に設けられる第２側壁７１Ｅと、該第２側壁７１Ｅの上部に設けられると共に前記内筒本体部７１内の空間と前記燃料タンク１００外部（大気）とを連通させる開口７１Ｓがその中央部に形成された上水平壁７１Ｆとから構成される。そして、前記第１側壁７１Ｃ、前記下水平壁７１Ｄ及び前記第２側壁７１Ｅとで、後述するが漏れた前記燃料の貯留部７１Ａが形成される。前記第２側壁７１Ｅは、上方に向かうに従って内径が小さくなるような内側面７１Ｅ１を有する。 The inner cylinder main body 71 includes a cylindrical first side wall 71C, a lower horizontal wall 71D provided inside in the upper part of the first side wall 71C, and a second side wall 71E provided in the upper part of the lower horizontal wall 71D. It is composed of an upper horizontal wall 71F provided in the upper part of the second side wall 71E and having an opening 71S formed in the central portion thereof to communicate the space inside the inner cylinder main body 71 and the outside (atmosphere) of the fuel tank 100. Will be done. Then, the first side wall 71C, the lower horizontal wall 71D, and the second side wall 71E form a leaked fuel storage portion 71A, which will be described later. The second side wall 71E has an inner side surface 71E1 whose inner diameter decreases toward the top.

なお、前記内筒本体部７１の前記第２側壁７１Ｅの前記内側面７１Ｅ１（前記内側面７１Ｅ１は、後述する第２空間Ｓ３２を形成する。）には、上下方向に長くて且つ所定の間隔を存して内方へ突出した複数条の凸部７１Ｔを形成し、各凸部７１Ｔ間に第１空気通路を形成する。 The inner side surface 71E1 of the second side wall 71E of the inner cylinder main body 71 (the inner side surface 71E1 forms the second space S32 described later) is long in the vertical direction and has a predetermined interval. A plurality of convex portions 71T that exist and project inward are formed, and a first air passage is formed between the convex portions 71T.

前記連結部７３の内側端部、即ち前記内筒本体部７１の前記第１側壁７１Ｃの下端部は切除されて第３空間Ｓ３３が形成され、この第３空間Ｓ３３は前記内筒本体部７１内の円柱状の第１空間Ｓ３１を介して円錐台形状の第２空間Ｓ３２に連通する。前記取付部７４の下面にリング状の収納溝７４Ａが下方から切除される。そして、取付部材８２の中央部の平面視円形状の厚肉部８２Ｔを前記連結部７３と前記取付部７４との段差により形成されて前記第３空間Ｓ３３に下方から連通する第４空間Ｓ３４内に嵌合させた状態で、ボルト８０とナット８１を使用して前記取付部材８２に前記筒本体７０を固定する場合には、更に前記取付部７４の周端部との中間位置に前記ボルト８０を挿通させるための取付孔７４Ｂが複数開設される。 The inner end of the connecting portion 73, that is, the lower end of the first side wall 71C of the inner cylinder main body 71 is cut off to form a third space S33, and the third space S33 is inside the inner cylinder main body 71. It communicates with the truncated cone-shaped second space S32 via the columnar first space S31. A ring-shaped storage groove 74A is cut off from below on the lower surface of the mounting portion 74. Then, in the fourth space S34 in which the thick portion 82T having a circular shape in a plan view at the center of the mounting member 82 is formed by the step between the connecting portion 73 and the mounting portion 74 and communicates with the third space S33 from below. When the cylinder body 70 is fixed to the mounting member 82 by using the bolt 80 and the nut 81 in the state of being fitted to the bolt 80, the bolt 80 is further located at an intermediate position with the peripheral end portion of the mounting portion 74. A plurality of mounting holes 74B for inserting the holes 74B are opened.

即ち、前記ボルト８０と前記ナット８１を使用して前記取付部材８２に前記筒本体７０を固定する場合には、Ｏリング８６を前記収納溝７４Ａに収納した状態で、前記取付孔７４Ｂと前記取付部材８２に開設した取付孔８２Ｂとを合致させて、両孔に前記ボルト８０を挿通させて前記ナット８１を締めて固定する（図２６の最下段に示す前記取付部材８２の左半分、図２７及び図２８の左半分参照）。また、超音波溶着により固定する場合には、前記取付部材８２の上面に突設された平面視円形状の溶着用リブ８２Ａを前記収納溝７４Ａに嵌合した状態で前記収納溝７４Ａの形成面に超音波溶着して、前記取付部材８２に前記筒本体７０を固定する（図２６の最下段に示す前記取付部材８２の右半分、図２７及び図２８の右半分参照）。 That is, when the cylinder body 70 is fixed to the mounting member 82 by using the bolt 80 and the nut 81, the mounting hole 74B and the mounting are mounted with the O-ring 86 housed in the storage groove 74A. The bolt 80 is inserted into both holes to match the mounting holes 82B formed in the member 82, and the nut 81 is tightened and fixed (the left half of the mounting member 82 shown in the lowermost part of FIG. 26, FIG. 27. And the left half of FIG. 28). Further, in the case of fixing by ultrasonic welding, the forming surface of the storage groove 74A in a state where the plan-view circular welding rib 82A projecting from the upper surface of the mounting member 82 is fitted into the storage groove 74A. The cylinder body 70 is fixed to the mounting member 82 by ultrasonic welding to the mounting member 82 (see the right half of the mounting member 82 shown at the bottom of FIG. 26, and the right half of FIGS. 27 and 28).

前記取付部材８２下部に設けられ前記取付部材８２の前記厚肉部８２Ｔに形成した連通口８２Ｓ２に連通する空間（連通路）８２Ｓ１を備える中空円筒状の筒状部８２Ｃを形成し、該筒状部８２Ｃの内側面に雌ネジ部８２Ｄを形成して、前記燃料タンク１００の上面に開設された開口に連通する空間を備えた中空状の取付筒部１００Ｂが前記燃料タンク１００の上面に設けられる。そして、前記取付筒部１００Ｂの外側面に雄ネジ部を形成し、該雄ネジ部と前記筒状部８２Ｃに形成された前記雌ネジ部８２Ｄとを螺合させることにより、前記燃料タンク１００に前記弁機構体６０を取り付けることができる。 A hollow cylindrical tubular portion 82C provided under the mounting member 82 and having a space (communication passage) 82S1 communicating with the communication port 82S2 formed in the thick portion 82T of the mounting member 82 is formed, and the tubular portion 82C is formed. A female screw portion 82D is formed on the inner surface of the portion 82C, and a hollow mounting cylinder portion 100B having a space communicating with an opening provided on the upper surface of the fuel tank 100 is provided on the upper surface of the fuel tank 100. .. Then, a male screw portion is formed on the outer surface of the mounting cylinder portion 100B, and the male screw portion and the female screw portion 82D formed on the tubular portion 82C are screwed into the fuel tank 100. The valve mechanism 60 can be attached.

そして、前記外筒本体部７２内の空間には、該外筒本体部７２の側壁とは隙間を存した状態で、耐油性に優れる活性炭フィルターや、ウレタン合成樹脂製のフィルター等の多孔質のフィルター７９を内部に収納する収納部材７５が配設され、前記エンジン９９が駆動して前記大気を前記燃料タンク１００内に導入する際に、前記フィルター７９は前記大気を濾過して前記大気中のゴミなどの異物を捕集して前記燃料タンク１００内に入り込むのを阻止する。前記収納部材７５の下部は、前記内筒本体部７１の前記第１側壁７１Ｃの上部に嵌合して取付けられる。しかし、前記収納部材７５と前記筒本体７０とは、別体のものを一体化させる場合に限らず、当初より一体化して作製してもよい。 Then, in the space inside the outer cylinder main body 72, there is a gap from the side wall of the outer cylinder main body 72, and a porous activated carbon filter having excellent oil resistance, a filter made of urethane synthetic resin, or the like is used. A storage member 75 for accommodating the filter 79 is arranged inside, and when the engine 99 is driven to introduce the atmosphere into the fuel tank 100, the filter 79 filters the atmosphere into the atmosphere. It collects foreign matter such as dust and prevents it from entering the fuel tank 100. The lower portion of the storage member 75 is fitted and attached to the upper portion of the first side wall 71C of the inner cylinder main body 71. However, the storage member 75 and the cylinder body 70 are not limited to the case where separate bodies are integrated, and may be integrally manufactured from the beginning.

詳述すると、前記収納部材７５は中空円筒状を呈して、大径空間７６Ｓが形成されると共に上端部には前記流体が通過できるように所定間隔を存して４か所切除されて開口７６Ａが形成された大径部７６と、小径空間７８Ｓが形成される小径部７８と、前記大径部７６と前記小径部７８とを連結するもので前記小径空間７８Ｓより小径の開口７７Ｓが開成された連結部７７とから構成される。そして、前記連結部７７は外方から内方に向けて徐々に薄肉となるように上面が下方へと傾斜している。また、前記連結部７７上面には所定間隔を存して４個のリブ７７Ａが所定間隔を存して形成され、該リブ７７Ａは前記大径部７６の内側面から前記連結部７７の前記開口７７Ｓの内端部には至らない長さまで延びており、該リブ７７Ａの上面は前記フィルター７９を水平に支持できるように水平に形成されている。 More specifically, the storage member 75 has a hollow cylindrical shape, a large-diameter space 76S is formed, and the opening 76A is cut at four places at a predetermined interval so that the fluid can pass through the upper end portion. The large-diameter portion 76 in which the small diameter space 78S is formed, the small-diameter portion 78 in which the small-diameter space 78S is formed, and the large-diameter portion 76 and the small-diameter portion 78 are connected, and an opening 77S having a smaller diameter than the small-diameter space 78S is opened. It is composed of a connecting portion 77. The upper surface of the connecting portion 77 is inclined downward so as to gradually become thinner from the outside to the inside. Further, four ribs 77A are formed on the upper surface of the connecting portion 77 at predetermined intervals, and the ribs 77A are formed from the inner side surface of the large diameter portion 76 to open the connecting portion 77. It extends to a length that does not reach the inner end of the 77S, and the upper surface of the rib 77A is formed horizontally so that the filter 79 can be supported horizontally.

そして、前記内筒本体部７１の前記第１側壁７１Ｃの上部が前記小径部７８の内側面と前記連結部７７下面に当接した状態で、前記内筒本体部７１が前記収納部材７５に嵌合して、前記内筒本体部７１に前記収納部材７５が取り付けられる。 Then, the inner cylinder main body 71 fits into the storage member 75 in a state where the upper portion of the first side wall 71C of the inner cylinder main body 71 is in contact with the inner side surface of the small diameter portion 78 and the lower surface of the connecting portion 77. In addition, the storage member 75 is attached to the inner cylinder main body 71.

上蓋８８は有底円筒状を呈して平面視円形状を呈すると共に縦断面が円弧状の上壁８８Ａと、該上壁８８Ａの周端部から垂れ下がった側壁８８Ｂとを備えている。該上蓋８８が前記筒本体７０の前記外筒本体部７２の上部に取り付けられた状態では、前記収納部材７５内の空間は前記収納部材７５の前記開口７６Ａ及び前記筒本体７０の前記外筒本体部７２の前記開口７２Ｂと前記切除部７２Ａ、前記上蓋８８の凹部８８Ｄを介して大気と連通させる構成である。 The upper lid 88 has a bottomed cylindrical shape and a circular shape in a plan view, and includes an upper wall 88A having an arcuate vertical cross section and a side wall 88B hanging from the peripheral end of the upper wall 88A. When the upper lid 88 is attached to the upper part of the outer cylinder body 72 of the cylinder body 70, the space inside the storage member 75 is the opening 76A of the storage member 75 and the outer cylinder body of the cylinder body 70. The structure is such that the opening 72B of the portion 72, the cut portion 72A, and the recess 88D of the upper lid 88 communicate with the atmosphere.

前記上蓋８８の対向する２か所において、前記上壁８８Ａ裏面にネジ９０の軸部の外径より大径で且つ頭部の外径より小径の挿通孔８９Ａが開設された案内部材８９が前記上壁８８Ａの周端部から内方へ延びるように形成され、また前記上蓋８８には前記挿通孔８９Ａと同心円で且つ前記挿通孔８９Ａより大径の挿通孔８８Ｃ（前記ネジ９０の頭部より大径）が開設される。また、前記上蓋８８の前記側壁８８Ｂの内側面には、４５度毎に前記凹部８８Ｄが形成される。 The guide member 89 is provided with an insertion hole 89A having an insertion hole 89A having a diameter larger than the outer diameter of the shaft portion of the screw 90 and a diameter smaller than the outer diameter of the head portion on the back surface of the upper wall 88A at two facing positions of the upper lid 88. The upper lid 88 is formed so as to extend inward from the peripheral end of the upper wall 88A, and the upper lid 88 has an insertion hole 88C (from the head of the screw 90) which is concentric with the insertion hole 89A and has a diameter larger than that of the insertion hole 89A. Large diameter) is opened. Further, the recess 88D is formed on the inner surface of the side wall 88B of the upper lid 88 at every 45 degrees.

前記フィルター７９は対向する２か所に上下方向に延びた平面視半円状の凹部７９Ａが形成され、また前記収納部材７５の前記大径部７６には収納する前記フィルター７９の形状に合わせて対向する２か所に上下方向に延びた平面視半円状の凹部７６Ｂが形成される。そして、前記外筒本体部７２の上部には、収納する前記収納部材７５の前記大径部７６の形状に合わせて対向する２か所に上下方向に延びた平面視半円状の膨出部７２Ｃが形成される。また、前記膨出部７２Ｃには前記ネジ９０が螺合するネジ溝７２Ｄが形成されている。 The filter 79 is formed with semicircular recesses 79A extending in the vertical direction at two opposite positions, and the large diameter portion 76 of the storage member 75 is fitted with the shape of the filter 79 to be stored. Semicircular recesses 76B extending in the vertical direction are formed at two facing locations. Then, on the upper portion of the outer cylinder main body 72, a semicircular bulge in a plan view extending in the vertical direction at two positions facing each other according to the shape of the large diameter portion 76 of the storage member 75 to be stored. 72C is formed. Further, a screw groove 72D into which the screw 90 is screwed is formed in the bulging portion 72C.

なお、前記昇降部材２３の前記空間２３Ｓ内に配設される前記スプリング１７の長さは、前記昇降部材２３の前記段差壁２３Ｅ下面と前記吹上部材５０の前記段差部５０Ｂの上面との間（図１９乃至図２９の実施形態は同様である。図７乃至図１１の実施形態では前記段差壁２３Ｅ下面と前記スプリング３３の上面との間、図１２の実施形態では前記段差壁２３Ｅ下面と前記キャップ１８の上面との間である。）の寸法に前記昇降部材２３の可動ストロークの、例えば１．０倍以上〜３．０倍以下の長さを加えた長さとすると共に、前記スプリング１７に掛かる前記弁体２２と前記昇降部材２３との合計重量によって前記燃料タンク１００の水平時に圧縮される長さが定まる。この場合、圧縮量が多ければ前記スプリング１７の反発力（「戻ろうとする付勢力」で、以下同じ。）は増大するので、前記スプリング１７の圧縮度合による反発力の大小によって、また弁部ＶＥの面積の大小によって設定された第１通路抵抗とによって、前記弁部ＶＥを通過する圧力を設定する。 The length of the spring 17 arranged in the space 23S of the elevating member 23 is between the lower surface of the step wall 23E of the elevating member 23 and the upper surface of the step portion 50B of the blow-up member 50. 19 to 29 are the same. In the embodiment of FIGS. 7 to 11, the lower surface of the step wall 23E and the upper surface of the spring 33 are located, and in the embodiment of FIG. 12, the lower surface of the step wall 23E and the above are the same. The length is the sum of the dimension of (between the upper surface of the cap 18) and the movable stroke of the elevating member 23, for example, 1.0 times or more and 3.0 times or less, and the spring 17 has a length. The total weight of the valve body 22 and the elevating member 23 to be hung determines the length of the fuel tank 100 to be compressed when it is horizontal. In this case, if the amount of compression is large, the repulsive force of the spring 17 (“the urging force to return”, the same shall apply hereinafter) increases. the first and the passage resistance set by the size of the area, to set the pressure you pass through the valve unit VE.

ここで、前述した弁部ＶＡと同様な構造である前記弁部ＶＥは、前記弁体２２の前述した前記横方向の外周ＣＦが前記第２側壁７１Ｅの前記内側面７１Ｅ１に突出した複数条の前記凸部７１Ｔの前記頂部に押圧して点接触する部位間の前記弁体２２の点接触しない前記横方向の外周の部分ＣＦ１と、前記弁体２２の前記中心ＣＯと前記横方向の外周ＣＦとを結んでできた前記面ＣＳ（例えば、円錐面）を外方へ延長した前記面で前記第１空気通路を形成する前記内側面７１Ｅ１及び該内側面７１Ｅ１の両隣の前記凸部７１Ｔを切断した前記第１空気通路の切り口である第１連通口とで構成される。 Here, the valve portion VE having the same structure as the valve portion VA described above has a plurality of strips in which the above-mentioned lateral outer peripheral CF of the valve body 22 projects from the inner side surface 71E1 of the second side wall 71E. The lateral outer peripheral portion CF1 of the valve body 22 that does not make point contact between the portions that press against the top of the convex portion 71T and make point contact, the central CO of the valve body 22 and the lateral outer peripheral CF. The inner side surface 71E1 and the convex portions 71T on both sides of the inner side surface 71E1 forming the first air passage are cut by the surface extending outward from the surface CS (for example, a conical surface) formed by connecting the two. It is composed of the first communication port, which is the cut end of the first air passage.

なお、（８）の実施形態における前記弁部ＶＥに代えて前記弁部ＶＢと同様な構造とした場合の弁部は、前記弁体２２の前述した前記横方向の外周ＣＦが前記第２側壁７１Ｅの前記内側面７１Ｅ１に押圧して線接触する部位間の前記弁体２２の線接触しない前記横方向の外周の部分ＣＦ２と、前記弁体２２の前記中心ＣＯと前記横方向の外周ＣＦとを結んでできた前記面ＣＳ（例えば、縁数面）を外方へ延長した前記面で第２空気通路を形成する前記凹部を形成するための面を切断した前記第２空気通路の切り口である第２連通口とで構成される。 In the case where the valve portion has the same structure as the valve portion VB instead of the valve portion VE in the embodiment (8), the outer peripheral CF in the lateral direction of the valve body 22 is the second side wall. The lateral outer peripheral portion CF2 of the valve body 22 that does not make line contact between the portions that press against the inner surface 71E1 of the 71E and make line contact, the central CO of the valve body 22 and the lateral outer peripheral CF. At the cut end of the second air passage, the surface for forming the recess is cut off from the surface obtained by extending the surface CS (for example, the number of edges) outward to form the second air passage. It is composed of a second communication port.

従って、前記燃料タンク１００の傾斜時において、前記弁体２２及び前記昇降部材２３は前記スプリング１７の反発力と流入する前記燃料の圧力により押し上げられて、前記弁体２２の上半球の上下方向における、例えば1／２の位置における前記横方向の外周ＣＦは前記内筒本体部７１の前記第２側壁７１Ｅの前記凸部７１Ｔの前記頂部に押圧して点接触（又は前記第２側壁７１Ｅの前記内側面７１Ｅ１に押圧して線接触）する。また、設定された圧力値に達すると、前記弁体２２の前記横方向の外周ＣＦと前記凸部７１Ｔの前記頂部との点接触（又は前記第２側壁７１Ｅの前記内側面７１Ｅ１との線接触）を解除し、流入した前記燃料の圧力により前記弁部ＶＥ（又は前記弁部ＶＢと同様な構造の前記弁部）を開放する。 Therefore, when the fuel tank 100 is tilted, the valve body 22 and the elevating member 23 are pushed up by the repulsive force of the spring 17 and the pressure of the fuel flowing in, and in the vertical direction of the upper hemisphere of the valve body 22. For example, the outer peripheral CF in the lateral direction at the position of 1/2 presses against the top of the convex portion 71T of the second side wall 71E of the inner cylinder main body 71 to make point contact (or the said of the second side wall 71E). Press against the inner side surface 71E1 to make line contact) . When the set pressure value is reached, point contact between the lateral outer peripheral CF of the valve body 22 and the top of the convex portion 71T (or line contact with the inner side surface 71E1 of the second side wall 71E). ) Is released, and the valve portion VE (or the valve portion having the same structure as the valve portion VB) is opened by the pressure of the inflowing fuel.

以下、前記燃料タンク１００への前記弁機構体６０（図２６乃至図２８参照）の取り付け順序について、説明する。先ず、図１９に示す実施形態と同様に、例えば前記昇降部材２３上に前記弁体２２を載置させた状態で、前記内筒本体部７１の空間内に前記昇降部材２３を収納する。 Hereinafter, the mounting order of the valve mechanism 60 (see FIGS. 26 to 28) to the fuel tank 100 will be described. First, as in the embodiment shown in FIG. 19, the elevating member 23 is housed in the space of the inner cylinder main body 71 in a state where the valve body 22 is placed on the elevating member 23, for example.

すると、前記昇降部材２３の前記小径部２３Ｂが前記弁体２２を載置した状態で前記第２空間Ｓ３２内に入り込むと共に、且つ前記大径部２３Ａが前記第１空間Ｓ３１内に入り込むこととなる。 Then, the small diameter portion 23B of the elevating member 23 enters the second space S32 with the valve body 22 mounted, and the large diameter portion 23A enters the first space S31. ..

次に、前記昇降部材２３の前記空間２３Ｓ内に前記スプリング１７を収納し、前記吹上部材５０の前記大径空間５０Ｓ２内に前記第１抵抗部材５１の前記下部５１Ａを収納させると共に前記上部５１Ｂを前記小径空間５０Ｓ１内に収納（配置）させる。前記吹上部材５０の前記大径部５０Ｃの上面の周縁部が前記段差部１６Ｇの下面に当接するようにして、前記昇降部材２３の前記空間２３Ｓ内に収納された前記スプリング１７内に前記吹上部材５０の前記小径部５０Ａを配置させて遊挿させる。従って、前記第１抵抗部材５１の前記連通口５１Ｅは、前記吹上部材５０の前記小径空間５０Ｓ１と前記燃料タンク１００とに連通する。 Next, the spring 17 is housed in the space 23S of the elevating member 23, the lower part 51A of the first resistance member 51 is housed in the large diameter space 50S2 of the blowing member 50, and the upper part 51B is stored. It is stored (arranged) in the small diameter space 50S1. The blowing member is housed in the space 23S of the elevating member 23 so that the peripheral edge of the upper surface of the large diameter portion 50C of the blowing member 50 abuts on the lower surface of the step portion 16G. The small diameter portion 50A of 50 is arranged and loosely inserted. Therefore, the communication port 51E of the first resistance member 51 communicates with the small diameter space 50S1 of the blow-up member 50 and the fuel tank 100.

そして、前記取付部材８２に前記筒本体７０を固定する。この場合、前記ボルト８０と前記ナット８１を使用して前記取付部材８２に前記筒本体７０を固定する場合には、前記Ｏリング８６を前記収納溝７４Ａに収納した状態で、前記取付部７４の前記取付孔７４Ｂと前記取付部材８２の前記取付孔８２Ｂとを合致させて、両孔に前記ボルト８０を挿通させて前記ナット８１を締めて固定する。また、超音波溶着により固定する場合には、前記取付部材８２の上面の前記溶着用リブ８２Ａを前記収納溝７４Ａに嵌合させた状態で前記収納溝７４Ａの形成面に超音波溶着して、固定する。 Then, the cylinder body 70 is fixed to the mounting member 82. In this case, when the cylinder body 70 is fixed to the mounting member 82 by using the bolt 80 and the nut 81, the mounting portion 74 has the O-ring 86 housed in the storage groove 74A. The mounting hole 74B and the mounting hole 82B of the mounting member 82 are matched, the bolt 80 is inserted into both holes, and the nut 81 is tightened and fixed. In the case of fixing by ultrasonic welding, the welding rib 82A on the upper surface of the mounting member 82 is ultrasonically welded to the forming surface of the storage groove 74A in a state of being fitted into the storage groove 74A. Fix.

また、前記フィルター７９を前記収納部材７５の前記大径空間７６Ｓ内に収納させ、前記上蓋８８を前記収納部材７５の上部及び前記筒本体７０の前記外筒本体部７２の前記上部を上方から覆うようにして、前記ネジ９０を前記挿通孔８８Ｃ、８９Ａに挿入して前記フィルター７９の前記凹部７９Ａに沿って前記外筒本体部７２の前記膨出部７２Ｃに形成した前記ネジ溝７２Ｄに螺合させて、前記上蓋８８を前記筒本体７０の前記外筒本体部７２に取り付けて固定する。 Further, the filter 79 is housed in the large-diameter space 76S of the storage member 75, and the upper lid 88 covers the upper part of the storage member 75 and the upper part of the outer cylinder body 72 of the cylinder body 70 from above. In this way, the screw 90 is inserted into the insertion holes 88C and 89A and screwed into the screw groove 72D formed in the bulging portion 72C of the outer cylinder main body 72 along the recess 79A of the filter 79. Then, the upper lid 88 is attached to and fixed to the outer cylinder main body 72 of the cylinder main body 70.

これにより、前記弁機構体６０の組み立てが終了する。そして、このようにして組み立てられた前記弁機構体６０を前記燃料タンク１００の上面に設けられた前記取付筒部１００Ｂの前記雄ネジ部と前記取付部材８２の前記筒状部８２Ｃに形成された前記雌ネジ部８２Ｄとを螺合させることにより、前記燃料タンク１００に前記弁機構体６０を取り付けることができる。 This completes the assembly of the valve mechanism 60. Then, the valve mechanism 60 assembled in this way is formed on the male screw portion of the mounting cylinder portion 100B provided on the upper surface of the fuel tank 100 and the tubular portion 82C of the mounting member 82. The valve mechanism 60 can be attached to the fuel tank 100 by screwing the female screw portion 82D.

前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量が、１．０倍未満、例えば０．８倍以上〜０．９３倍以下とした実施形態にあっては、前記燃料タンク１００が概ね水平状態にあれば、前記燃料タンク１００内の圧力値に関係なく、図２７に示すように、前記昇降部材２３と前記弁体２２は、前記弁体２２と前記昇降部材２３との合計重量未満の付勢力で前記スプリング１７が圧縮された状態で、下降している。 In the embodiment in which the urging force of the spring 17 is less than 1.0 times, for example, 0.8 times or more and 0.93 times or less the total weight of the elevating member 23 and the valve body 22. When the fuel tank 100 is in a substantially horizontal state, the elevating member 23 and the valve body 22 are the valve body 22 and the elevating member, as shown in FIG. 27, regardless of the pressure value in the fuel tank 100. The spring 17 is lowered in a state of being compressed by an urging force less than the total weight of the 23.

従って、前記弁体２２は前記内筒本体部７１の前記第２側壁７１Ｅの前記内側面７１Ｅ１の前記凸部７１Ｔ（又は前記第２側壁７１Ｅの前記内側面７１Ｅ１）に接触せずに、前記弁部ＶＥ（又は前記弁部ＶＢと同様な構造の前記弁部）は開放している。 Therefore, the valve body 22 does not come into contact with the convex portion 71T (or the inner side surface 71E1 of the second side wall 71E) of the inner side surface 71E1 of the second side wall 71E of the inner cylinder main body 71, and the valve. The part VE (or the valve part having the same structure as the valve part VB) is open.

しかし、前記燃料タンク１００が傾斜した場合には、傾斜角度が９０度になるまでは、この傾斜角度に応じて前記昇降部材２３と前記弁体２２との前記スプリング１７に掛かる重量が減少し、前記燃料タンク１００の水平時に圧縮していた前記スプリング１７は前記傾斜角度が大きくなるに従い伸長する長さが増すこととなる。従って、前記スプリング１７に掛かる重量が減少するに伴って、前記スプリング１７の付勢力により前記弁体２２は押し上げられ、やがて前記スプリング１７の長さが所定の長さになると、前記弁体２２は前記第２側壁７１Ｅの前記内側面７１Ｅ１の前記凸部７１Ｔ（又は前記第２側壁７１Ｅの前記内側面７１Ｅ１）に接触することとなる。 However, when the fuel tank 100 is tilted, the weight of the elevating member 23 and the valve body 22 on the spring 17 decreases according to the tilt angle until the tilt angle reaches 90 degrees. The spring 17, which has been compressed when the fuel tank 100 is horizontal, extends in length as the inclination angle increases. Therefore, as the weight applied to the spring 17 decreases, the valve body 22 is pushed up by the urging force of the spring 17, and when the length of the spring 17 eventually reaches a predetermined length, the valve body 22 becomes. It comes into contact with the convex portion 71T (or the inner side surface 71E1 of the second side wall 71E) of the inner side surface 71E1 of the second side wall 71E.

このため、図２８に示すように、前記燃料タンク１００が傾斜した場合には、前記燃料が前記燃料タンク１００の前記取付筒部１００Ｂ内の前記空間を介して前記取付部材８２の前記空間８２Ｓ１及び前記連通口８２Ｓ２、前記第１抵抗部材５１の前記溝５１Ｄ、前記連通口５１Ｅ及び前記溝５１Ｃ、前記上部５１Ｂの周囲の前記小径空間５０Ｓ１を経て前記昇降部材２３の前記空間２３Ｓに入り込む。このとき、前記第１抵抗部材５１の前記連通口５１Ｅで前記燃料の前記圧力は減少されると共に前記第１抵抗部材５１の前記上部５１Ｂにより前記上部５１Ｂの周囲の前記小径空間５０Ｓ１を通過する前記燃料の圧力も減少されて、流速が早められた前記燃料は前記昇降部材２３の前記空間２３Ｓ内に噴出する。このため、前記スプリング１７の付勢力と相俟って、前記昇降部材２３と前記弁体２２を素早く押し上げて、前記弁部ＶＥ（又は前記弁部ＶＢと同様な構造の前記弁部）において、前記弁体２２は前記第２側壁７１Ｅの前記内側面７１Ｅ１の前記凸部７１Ｔ（又は前記第２側壁７１Ｅの前記内側面７１Ｅ１）に接触する。 Therefore, as shown in FIG. 28, when the fuel tank 100 is tilted, the fuel passes through the space in the mounting cylinder portion 100B of the fuel tank 100 and the space 82S1 of the mounting member 82 and the space 82S1. It enters the space 23S of the elevating member 23 through the communication port 82S2, the groove 51D of the first resistance member 51, the communication port 51E and the groove 51C, and the small diameter space 50S1 around the upper portion 51B. At this time, the pressure of the fuel is reduced at the communication port 51E of the first resistance member 51, and the upper portion 51B of the first resistance member 51 passes through the small diameter space 50S1 around the upper portion 51B. The pressure of the fuel is also reduced, and the fuel whose flow velocity is increased is ejected into the space 23S of the elevating member 23. Therefore, in combination with the urging force of the spring 17, the elevating member 23 and the valve body 22 are quickly pushed up in the valve portion VE (or the valve portion having the same structure as the valve portion VB) . The valve body 22 comes into contact with the convex portion 71T (or the inner side surface 71E1 of the second side wall 71E) of the inner side surface 71E1 of the second side wall 71E.

なお、（８−１）の実施形態における後述する所定値である５ｋＰａは、前記弁部ＶＥ（又は前記弁部ＶＢと同様な構造の前記弁部）の面積の大きさにより設定された前記第１通路抵抗（又は第２通路抵抗）と、前記弁体２２と前記昇降部材２３との合計重量未満の前記スプリング１７の付勢力の大きさとにより設定された圧力値である。 The predetermined value of 5 kPa in the embodiment of (8-1) is set by the size of the area of the valve portion VE (or the valve portion having the same structure as the valve portion VB). It is a pressure value set by the one-passage resistance (or the second passage resistance) and the magnitude of the urging force of the spring 17 which is less than the total weight of the valve body 22 and the elevating member 23.

以上のように、前記燃料タンク１００が傾斜した状態において、前記所定値である、例えば５ｋＰａに達するまでは、前記弁体２２は前記第２側壁７１Ｅの前記内側面７１Ｅ１の前記凸部７１Ｔ（又は前記第２側壁７１Ｅの前記内側面７１Ｅ１）に接触している状態が維持されるため、前記弁部ＶＥ（又は前記弁部ＶＢと同様な構造の前記弁部）に設定された前記第１通路抵抗（又は前記第２通路抵抗）により、前記内筒本体部７１内の前記第１空間Ｓ３１内の前記燃料は、前記上水平壁７１Ｆの前記開口７１Ｓを介して前記収納部材７５の前記大径空間７６Ｓ内へ流入しない。このため、前記燃料タンク１００の外部、即ち前記弁機構体６０の外部へと流出しない。 As described above, in the state where the fuel tank 100 is tilted , the valve body 22 is the convex portion 71T (or the convex portion 71T) of the inner side surface 71E1 of the second side wall 71E until the predetermined value, for example, 5 kPa is reached. Since the state of contact with the inner side surface 71E1) of the second side wall 71E is maintained, the first passage set in the valve portion VE (or the valve portion having the same structure as the valve portion VB). Due to the resistance (or the second passage resistance), the fuel in the first space S31 in the inner cylinder main body 71 has a large diameter of the storage member 75 through the opening 71S of the upper horizontal wall 71F. Does not flow into space 76S. Therefore, it does not flow out to the outside of the fuel tank 100, that is, to the outside of the valve mechanism 60.

従って、前記燃料の前記燃料タンク１００外部への放出を抑制し、前記弁機構体６０の前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Therefore, the release of the fuel to the outside of the fuel tank 100 is suppressed, and the valve mechanism portion of the valve mechanism 60 has a function as a safety valve, which can improve fuel efficiency and prevent environmental pollution. can do.

また同じく前記燃料タンク１００が傾斜した状態で、前記燃料タンク１００からの前記燃料の圧力（流体圧力）が、例えば５ｋＰａに達した場合には、前記燃料が前記弁部ＶＥ（又は前記弁部ＶＢと同様な構造の前記弁部）を通過し、この斜め上方へ向けて上昇する前記燃料が前記スプリング１７の付勢力に抗して前記昇降部材２３と前記弁体２２を円錐台形状の前記第２空間Ｓ３２内で斜め上方から下方へ下降させて、前記弁部ＶＥ（又は前記弁部ＶＢと同様な構造の前記弁部）を開放する。このため、前記内筒本体部７１の前記開口７１Ｓを介して前記内筒本体部７１の前記貯留部７１Ａ、前記収納部材７５の前記小径空間７８Ｓ及び前記大径空間７６Ｓ内へと前記燃料は流入することとなる。 Similarly, when the pressure (fluid pressure) of the fuel from the fuel tank 100 reaches, for example, 5 kPa while the fuel tank 100 is tilted, the fuel is the valve portion VE (or the valve portion VB). The fuel, which passes through the valve portion having the same structure as that of the above, and rises diagonally upward, causes the elevating member 23 and the valve body 22 to have a conical trapezoidal shape against the urging force of the spring 17 . The valve portion VE (or the valve portion having the same structure as the valve portion VB) is opened by descending from diagonally above to downward in the space S32 . Therefore, the fuel flows into the storage portion 71A of the inner cylinder main body 71, the small diameter space 78S of the storage member 75, and the large diameter space 76S through the opening 71S of the inner cylinder main body 71. Will be done.

このため、前記大径空間７６Ｓ内の前記フィルター７９は前記燃料をその内部の空間内に吸収する（取り込む）が、吸収できる量を超えた前記燃料は前記収納部材７５の前記開口７６Ａ及び前記筒本体７０の前記外筒本体部７２の前記開口７２Ｂと前記切除部７２Ａ、前記上蓋８８の前記凹部８８Ｄを介して前記弁機構体６０の外部へと流出する。 Therefore, the filter 79 in the large-diameter space 76S absorbs (takes in) the fuel into the space inside the large-diameter space 76S, but the fuel exceeding the absorbable amount is absorbed in the opening 76A of the storage member 75 and the cylinder. It flows out to the outside of the valve mechanism 60 through the opening 72B of the outer cylinder main body 72 of the main body 70, the cutting portion 72A, and the recess 88D of the upper lid 88.

そして、前記燃料タンク１００が水平状態（「概ね水平状態」を含む。）に復帰した場合には、前記弁体２２及び前記昇降部材２３の重量により前記スプリング１７が圧縮されて前記弁体２２及び前記昇降部材２３が下降して前記弁部ＶＥ（又は前記弁部ＶＢと同様な構造の前記弁部）は開放する。そして、前記フィルター７９に吸収された前記燃料は自重により直接垂れ落ちるか上面が内方に向けて傾斜している前記連結部７７を介して前記貯留部７１Ａへと導かれる。また、前記エンジン９９の駆動による前記燃料の消費により前記燃料タンク１００内の圧力が負圧になる際に、前記上蓋８８の前記凹部８８Ｄ、前記外筒本体部７２の前記切除部７２Ａ、前記開口７２Ｂ及び前記収納部材７５の前記開口７６Ａを介して大気を流入させながら前記フィルター７９に吸収された前記燃料は前記貯留部７１Ａへと導かれる。そして、前述したように、前記燃料の自重によってか、又は前記燃料の消費によって前記貯留部７１Ａに貯留された前記燃料は、前記エンジン９９の駆動による前記燃料の消費により前記燃料タンク１００内の圧力が負圧になる際に、前記大気と共に前記燃料タンク１００に戻され、前記フィルター７９は前記燃料の吸収前の状態に再生される。 When the fuel tank 100 returns to the horizontal state (including the "generally horizontal state"), the spring 17 is compressed by the weight of the valve body 22 and the elevating member 23, and the valve body 22 and the valve body 22 and the elevating member 23 are compressed. The elevating member 23 descends to open the valve portion VE (or the valve portion having the same structure as the valve portion VB). Then, the fuel absorbed by the filter 79 is directly dripped by its own weight or guided to the storage portion 71A via the connecting portion 77 whose upper surface is inclined inward. Further, when the pressure in the fuel tank 100 becomes negative due to the consumption of the fuel by driving the engine 99, the recess 88D of the upper lid 88, the cut portion 72A of the outer cylinder main body 72, and the opening. The fuel absorbed by the filter 79 while flowing air through the opening 76A of the storage member 75 and 72B is guided to the storage section 71A. Then, as described above, the fuel stored in the storage unit 71A due to the weight of the fuel itself or due to the consumption of the fuel is the pressure in the fuel tank 100 due to the consumption of the fuel by driving the engine 99. Is returned to the fuel tank 100 together with the atmosphere when the pressure becomes negative, and the filter 79 is regenerated to the state before absorption of the fuel.

なお、前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍未満とした場合の前記弁機構体６０において、前記燃料タンク１００が概ね水平状態にあって、振動によって前記燃料タンク１００内の前記燃料の波動が生じて前記燃料による圧力が上昇しても、前記第１抵抗部材５１の前記連通口５１Ｅ及び前記第１抵抗部材５１の前記上部５１Ｂが収納される前記吹上部材５０の前記小径空間５０Ｓ１により前記燃料の圧力は減圧されるので、更には前記開口７１Ｓから前記燃料が上方へ流出しても前記フィルター７９に吸収されるので、前記燃料は前記弁機構体６０外部に流出することが抑制される。このことは、（７−２）で前述したような実施形態においても、前記第１抵抗部材５１や前記第２抵抗部材５２により、減圧されるので、同様に前記燃料は前記弁機構体６０外部に流出することが抑制される。 The fuel tank 100 is in a substantially horizontal state in the valve mechanism 60 when the urging force of the spring 17 is less than 1.0 times the total weight of the elevating member 23 and the valve body 22. Therefore, even if the vibration causes a wave of the fuel in the fuel tank 100 and the pressure due to the fuel rises, the communication port 51E of the first resistance member 51 and the upper portion 51B of the first resistance member 51 remain. Since the pressure of the fuel is reduced by the small diameter space 50S1 of the blow-up member 50 to be housed, and further, even if the fuel flows upward from the opening 71S, it is absorbed by the filter 79, so that the fuel is absorbed. The outflow to the outside of the valve mechanism 60 is suppressed. This means that even in the embodiment described in (7-2), the pressure is reduced by the first resistance member 51 and the second resistance member 52, so that the fuel is similarly external to the valve mechanism 60. The outflow to is suppressed.

（８−２）前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量の１．０倍以上とした実施形態（図２６、図２９参照）
以下の図２９に示す実施形態については、前記スプリング１７の付勢力が前記昇降部材２３と前記弁体２２との合計した重量が、１．０倍以上、例えば１．１以上〜２．０倍以下であり、以下説明する。 (8-2) An embodiment in which the urging force of the spring 17 is 1.0 times or more the total weight of the elevating member 23 and the valve body 22 (see FIGS. 26 and 29).
In the embodiment shown in FIG. 29 below, the urging force of the spring 17 is 1.0 times or more, for example, 1.1 or more to 2.0 times the total weight of the elevating member 23 and the valve body 22. It is as follows, and will be described below.

初めに、前記燃料タンク１００が概ね水平状態又は傾斜した状態において、前記エンジン９９の停止中において、外気温度が上昇して、前記燃料タンク１００内の内圧が高まっても、前記燃料タンク１００内の前記内圧が、例えば５ｋＰａ未満であれば、前述したように、前記弁体２２の前記横方向の外周ＣＦが前記内筒本体部７１の前記第２側壁７１Ｅの前記内側面７１Ｅ１に形成した前記凸部７１Ｔの前記頂部に前記スプリング１７の付勢力により押圧されて点接触して（又は同じく前記横方向の外周ＣＦが前記第２側壁７１Ｅの前記内側面７１Ｅ１に線接触して）、前記第１通路抵抗（又は前記第２通路抵抗）により前記第１空間Ｓ３１内の前記ＶＯＣガス又は前記燃料は前記第２空間Ｓ３２及び前記開口７１Ｓを介して前記燃料タンク１００外部、即ち前記弁機構体６０外部へ放出されない（図２９参照）。 First, in a state where the fuel tank 100 is substantially horizontal or tilted, even if the outside air temperature rises and the internal pressure in the fuel tank 100 increases while the engine 99 is stopped, the inside of the fuel tank 100 If the internal pressure is, for example, less than 5 kPa, as described above, the convex outer surface CF of the valve body 22 in the lateral direction is formed on the inner surface 71E1 of the second side wall 71E of the inner cylinder main body 71. wherein the top parts 71T contact points are pressed by the urging force of the spring 17 (or also the lateral periphery CF is in line contact with the inner surface 71E1 of the second side wall 71E of), the first Due to the passage resistance (or the second passage resistance), the VOC gas or the fuel in the first space S31 is outside the fuel tank 100, that is, outside the valve mechanism 60 through the second space S32 and the opening 71S. Not released to (see FIG. 29).

なお、（８−２）の実施形態における後述する所定値である５ｋＰａは、前記弁部ＶＥ（又は前記弁部ＶＢと同様な構造の前記弁部）の面積の大きさにより設定された前記第１通路抵抗（又は前記第２通路抵抗）と、前記弁体２２と前記昇降部材２３との合計重量以上の前記スプリング１７の付勢力の大きさとにより設定された圧力値である。 The predetermined value of 5 kPa in the embodiment of (8-2) is set by the size of the area of the valve portion VE (or the valve portion having the same structure as the valve portion VB). It is a pressure value set by one passage resistance (or the second passage resistance) and the magnitude of the urging force of the spring 17 which is equal to or more than the total weight of the valve body 22 and the elevating member 23.

同じく前記燃料タンク１００が概ね水平状態又は傾斜した状態において、前記エンジン９９の停止中において、外気温度の更なる上昇に伴って、前記ＶＯＣガスの発生量が更に増大して、又は前記燃料タンク１００内が前記燃料の満タン状態かこれに近い状態下で前記燃料が膨張して、前記燃料タンク１００内の圧力が更に高まって、例えば５ｋＰａに達すると、前記燃料タンク１００からの前記ＶＯＣガス又は前記燃料は、前記第２側壁７１Ｅの前記内側面７１Ｅ１に形成された前記第１空気通路（又は前記第２空気通路）内を前記ＶＯＣガス又は前記燃料が上昇して、前記弁部ＶＥ（又は前記弁部ＶＢと同様な構造の前記弁部）を通過し、この斜め上方へ向けて上昇する前記ＶＯＣガス又は前記燃料が前記スプリング１７の付勢力に抗して前記昇降部材２３と前記弁体２２を円錐台形状の前記第２空間Ｓ３２内で斜め上方から下方へ下降させて、前記弁部ＶＥ（又は前記弁部ＶＢと同様な構造の前記弁部）を開放する。このため、前記内筒本体部７１の前記開口７１Ｓを介して前記内筒本体部７１の前記貯留部７１Ａ、前記収納部材７５の前記小径空間７８Ｓ及び前記大径空間７６Ｓ内へと前記ＶＯＣガス又は前記燃料は流入することとなる。 Similarly, when the fuel tank 100 is substantially horizontal or tilted, the amount of VOC gas generated is further increased or the fuel tank 100 is generated as the outside air temperature further rises while the engine 99 is stopped. When the fuel expands and the pressure in the fuel tank 100 further increases, for example, reaches 5 kPa when the inside is full or close to the fuel, the VOC gas from the fuel tank 100 or The fuel is the VOC gas or the fuel rising in the first air passage (or the second air passage) formed on the inner side surface 71E1 of the second side wall 71E, and the valve portion VE (or the fuel). The elevating member 23 and the valve body when the VOC gas or the fuel that passes through the valve portion) having the same structure as the valve portion VB and rises diagonally upward is opposed to the urging force of the spring 17. 22 is lowered from diagonally above to downward in the conical trapezoidal second space S32 to open the valve portion VE (or the valve portion having the same structure as the valve portion VB). Therefore, the VOC gas or the VOC gas or the VOC gas or the VOC gas or the VOC gas into the small diameter space 78S and the large diameter space 76S of the storage member 75, the storage portion 71A of the inner cylinder main body 71, through the opening 71S of the inner cylinder main body 71. The fuel will flow in.

このため、前記ＶＯＣガスは、前記大径空間７６Ｓ内の前記フィルタ−７９を通過して、前記収納部材７５の前記開口７６Ａ及び前記筒本体７０の前記外筒本体部７２の前記開口７２Ｂと前記切除部７２Ａ、前記上蓋８８の前記凹部８８Ｄを介して前記弁機構体６０の外部へと放出される。また、前記燃料は前記大径空間７６Ｓ内の前記フィルター７９の内部の空間内に吸収されるが、吸収できる量を超えた前記燃料は前記収納部材７５の前記開口７６Ａ及び前記筒本体７０の前記外筒本体部７２の前記開口７２Ｂと前記切除部７２Ａ、前記上蓋８８の前記凹部８８Ｄを介して前記弁機構体６０の外部へと放出される。即ち、前記燃料タンク１００内からの過大な前記流体（前記ＶＯＣガスや前記燃料）の圧力は、前記弁機構体６０の外部へと放出される。 Therefore, the VOC gas passes through the filter-79 in the large-diameter space 76S, and the opening 76A of the storage member 75 and the opening 72B of the outer cylinder body 72 of the cylinder body 70 and the opening 72B. It is discharged to the outside of the valve mechanism 60 through the excised portion 72A and the recess 88D of the upper lid 88. Further, the fuel is absorbed in the space inside the filter 79 in the large diameter space 76S, but the fuel exceeding the amount that can be absorbed is the fuel in the opening 76A of the storage member 75 and the cylinder body 70. It is discharged to the outside of the valve mechanism 60 through the opening 72B of the outer cylinder main body 72, the cutting portion 72A, and the recess 88D of the upper lid 88. That is, the excessive pressure of the fluid (the VOC gas or the fuel) from the inside of the fuel tank 100 is released to the outside of the valve mechanism 60.

そして、前記ＶＯＣガス又は前記燃料が放出されて、前記燃料タンク１００内の圧力が５ｋＰａ未満になると、前記スプリング１７の付勢力により前記昇降部材２３及び前記弁体２２が上昇して、前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部７１Ｔと点接触する（又は同じく前記横方向の外周ＣＦが前記第２側壁７１Ｅの前記内側面７１Ｅ１に線接触する）。従って、前記弁機構部は安全弁としての機能を有し、燃費の向上を図ることができると共に環境の汚染を防止することができる。 Then, when the VOC gas or the fuel is released and the pressure in the fuel tank 100 becomes less than 5 kPa, the elevating member 23 and the valve body 22 are raised by the urging force of the spring 17, and the valve body is raised. The lateral outer peripheral CF of 22 makes point contact with the plurality of convex portions 71T (or the lateral outer peripheral CF also makes line contact with the inner side surface 71E1 of the second side wall 71E). Therefore, the valve mechanism portion has a function as a safety valve, can improve fuel efficiency, and can prevent environmental pollution.

前記弁体２２の前記横方向の外周ＣＦが複数条の前記凸部７１Ｔと点接触する（又は同じく前記横方向の外周ＣＦが前記第２側壁７１Ｅの前記内側面７１Ｅ１に線接触する）と、前記燃料タンク１００が概ね水平状態であれば、前記フィルター７９に吸収された前記燃料は自重により直接垂れ落ちるか上面が内方に向けて傾斜している前記連結部７７を介して前記貯留部７１Ａへと導かれる。また、前記エンジン９９の駆動による前記燃料の消費により前記燃料タンク１００内の圧力が負圧になる際に、前記上蓋８８の前記凹部８８Ｄ、前記外筒本体部７２の前記切除部７２Ａ、前記開口７２Ｂ及び前記収納部材７５の前記開口７６Ａを介して大気を流入させながら前記フィルター７９に吸収された前記燃料は前記貯留部７１Ａへと導かれる。そして、前述したように、前記燃料の自重によってか、又は前記燃料の消費によって前記貯留部７１Ａに貯留された前記燃料は、前記エンジン９９の駆動による前記燃料の消費により前記燃料タンク１００内の圧力が負圧になる際に、前記大気と共に前記燃料タンク１００に戻され、前記フィルター７９は前記燃料の吸収前の状態に再生される。 When the lateral outer peripheral CF of the valve body 22 makes point contact with the plurality of convex portions 71T (or the lateral outer peripheral CF also makes line contact with the inner side surface 71E1 of the second side wall 71E) , When the fuel tank 100 is in a substantially horizontal state, the fuel absorbed by the filter 79 hangs down directly due to its own weight or the storage portion 71A via the connecting portion 77 whose upper surface is inclined inward. It is guided to. Further, when the pressure in the fuel tank 100 becomes negative due to the consumption of the fuel by driving the engine 99, the recess 88D of the upper lid 88, the cut portion 72A of the outer cylinder main body 72, and the opening. The fuel absorbed by the filter 79 while flowing air through the opening 76A of the storage member 75 and 72B is guided to the storage section 71A. Then, as described above, the fuel stored in the storage unit 71A due to the weight of the fuel itself or due to the consumption of the fuel is the pressure in the fuel tank 100 due to the consumption of the fuel by driving the engine 99. Is returned to the fuel tank 100 together with the atmosphere when the pressure becomes negative, and the filter 79 is regenerated to the state before absorption of the fuel.

なお、（８−１）及び（８−２）の前記弁機構体６０を前述した前記給油口キャップ１０として使用することもできる。 The valve mechanism 60 of (8-1) and (8-2) can also be used as the refueling port cap 10 described above.

（９）その他
以上説明した全ての実施形態において、前記給油口キャップ１０又は前記弁機構体６０の前記燃料タンク１００への取付方法又は構造は、ネジ式又は前記スプリング３３を使用して説明したが、これらに限らず、その取付方法又は構造は問わない。また、前記弁機構体６０は前記燃料タンク１００へ直接取り付けても、ホース等の連結部材を介して間接的に取り付けてもよく、特に取付方法又は構造も問わない。 (9) Others In all the embodiments described above, the method or structure of attaching the fuel filler port cap 10 or the valve mechanism 60 to the fuel tank 100 has been described using a screw type or the spring 33. , Not limited to these, the mounting method or structure does not matter. Further, the valve mechanism 60 may be directly attached to the fuel tank 100 or indirectly via a connecting member such as a hose, and the attachment method or structure is not particularly limited.

なお、上述した全ての実施形態において、前記弁部ＶＡ、ＶＢ、ＶＣ、ＶＥは前記弁体２２又は前記半球部分２２Ａ１の前記弁体部２２Ａの前記横方向の外周と、前記筒本体１６Ｅの前記内側面１６Ｅ１（前記凸部又は前記凹部を含む。）又は前記内筒本体部７１の前記内側面７１Ｅ１（前記凸部又は前記凹部を含む。）との間で形成される開口のうち最も狭い開口である。 In all the above-described embodiments, the valve portions VA, VB, VC, and VE are the outer periphery of the valve body portion 22A of the valve body 22 or the hemispherical portion 22A1 in the lateral direction, and the cylinder body 16E. The narrowest opening formed between the inner side surface 16E1 (including the convex portion or the concave portion) or the inner side surface 71E1 (including the convex portion or the concave portion) of the inner cylinder main body 71. Is.

即ち、上述した全ての実施形態において、前記弁部ＶＡ、ＶＢ、ＶＣ、ＶＥは、
（ａ−１）前記昇降部材２３上の前記弁体２２の前記横方向の外周ＣＦ（又は前記弁体部２２Ａの前記半球部分２２Ａ１の前記横方向の外周ＣＰ）が複数条の前記凸部１６Ｔ、７１Ｔに点接触する部位間の前記弁体２２の点接触しない前記横方向の外周ＣＦの部分（又は前記半球部分２２Ａ１の点接触しない前記横方向の外周ＣＰの部分）、
（ａ−２）又は前記弁体２２の前記横方向の外周ＣＦ（又は前記半球部分２２Ａ１の前記横方向の外周ＣＰ）が前記内側面１６Ｅ１、７１Ｅ１に線接触する部位間の前記弁体２２の線接触しない前記横方向の外周ＣＦの部分（又は前記半球部分２２Ａ１の線接触しない前記横方向の外周ＣＰの部分）と、
（ｂ−１）前記弁体２２の点接触しない前記横方向の外周ＣＦの部分（又は前記半球部分２２Ａ１の点接触しない前記横方向の外周ＣＰの部分）と前記内側面１６Ｅ１、７１Ｅ１及び該内側面１６Ｅ１、７１Ｅ１の両隣の前記凸部１６Ｔ、７１Ｔとの間で形成される開口のうち最も狭い開口を形成するように前記第１空気通路を形成する前記内側面１６Ｅ１、７１Ｅ１及び該内側面１６Ｅ１、７１Ｅ１の両隣の前記凸部１６Ｔ、７１Ｔを切断した前記第１空気通路の切り口である第１連通口、
（ｂ−２）又は前記弁体２２の線接触しない前記横方向の外周ＣＦの部分（又は前記半球部分２２Ａ１の線接触しない前記横方向の外周ＣＰの部分）と前記第２空気通路を形成する前記凹部との間で形成される開口のうち最も狭い開口を形成するように前記凹部を形成するための面を切断した前記第２空気通路の切り口である第２連通口とで構成される。 That is, in all the above-described embodiments, the valve portions VA, VB, VC, and VE are
(A-1) The lateral outer peripheral CF of the valve body 22 on the elevating member 23 (or the lateral outer peripheral CP of the hemispherical portion 22A1 of the valve body portion 22A) is a plurality of the convex portions 16T. , The portion of the lateral outer peripheral CF of the valve body 22 that does not make point contact between the parts that make point contact with 71T (or the portion of the lateral outer peripheral CP that does not make point contact of the hemispherical portion 22A1).
(A-2) or the lateral outer peripheral CF of the valve body 22 (or the lateral outer peripheral CP of the hemispherical portion 22A1) of the valve body 22 between the portions where the lateral outer peripheral CF of the valve body 22 is in line contact with the inner side surfaces 16E1 and 71E1. The portion of the outer peripheral CF in the lateral direction that does not make line contact (or the portion of the outer peripheral CP in the lateral direction that does not make line contact with the hemispherical portion 22A1).
(B-1) The lateral outer peripheral CF portion (or the lateral outer peripheral CP portion of the hemispherical portion 22A1 that does not make point contact) and the inner side surfaces 16E1, 71E1 and the inside thereof that do not make point contact with the valve body 22. The inner side surfaces 16E1, 71E1 and the inner side surface 16E1 forming the first air passage so as to form the narrowest opening among the openings formed between the convex portions 16T and 71T on both sides of the side surfaces 16E1 and 71E1. , The first communication port, which is the cut end of the first air passage by cutting the convex portions 16T and 71T on both sides of 71E1.
(B-2) or the lateral outer peripheral CF portion (or the lateral outer peripheral CP portion of the hemispherical portion 22A1 that does not make line contact) and the second air passage are formed. It is composed of a second communication port, which is a cut end of the second air passage, in which a surface for forming the recess is cut so as to form the narrowest opening among the openings formed with the recess.

なお、以上説明した全ての実施形態において、前記燃料タンク１００に断熱処理を施すことにより、前記燃料タンク１００内の圧力の上昇を抑制することができるので、以上説明した前記給油口キャップ１０又は前記弁機構体６０との組み合わせにより、前記ＶＯＣガス又は前記燃料の前記燃料タンク１００外部への放出を更に抑制し、燃費の向上を図ることができると共に環境の汚染を防止することができ、また米国のカリフォルニア州の試験法にも対応可能となるものである。 In all the embodiments described above, by applying the heat insulating treatment to the fuel tank 100, it is possible to suppress an increase in the pressure in the fuel tank 100. Therefore, the fuel filler cap 10 or the fuel tank cap 10 described above or the above. By combining with the valve mechanism 60, it is possible to further suppress the release of the VOC gas or the fuel to the outside of the fuel tank 100, improve fuel efficiency, and prevent environmental pollution. It will also be compatible with the California test method.

以上説明した実施形態によれば、前述した特許文献１、２に開示された技術に比べて、更に一層、前記燃料から蒸発した前記有害な前記ＶＯＣガス又は前記燃料を外部に放出させることなく環境汚染を防止でき、燃費の向上も図ることができる燃料タンクの前記給油口キャップ１０又は前記弁機構体６０を提供することができる。 According to the embodiment described above, as compared with the techniques disclosed in Patent Documents 1 and 2 described above, the environment without releasing the harmful VOC gas or the fuel evaporated from the fuel to the outside. It is possible to provide the fuel filler port cap 10 or the valve mechanism 60 of the fuel tank, which can prevent contamination and improve fuel efficiency.

以上のように、本発明の実施態様について説明したが、上述の説明に基づいて当業者にとって種々の代替例、修正又は変形が可能であり、本発明はその趣旨を逸脱しない範囲で前述の種々の代替例、修正又は変形を包含するものである。 Although the embodiments of the present invention have been described above, various alternative examples, modifications or modifications can be made to those skilled in the art based on the above description, and the present invention has the above-mentioned various examples without departing from the spirit thereof. It includes alternatives, modifications or modifications of.

１０ 給油口キャップ
１２ 外蓋
１３ 内蓋
１５ 第１空気通路
１５Ａ 第２空気通路
１６ 筒本体
１６Ｅ１ 内側面
１６Ｔ 凸部
１７ スプリング
２２ 弁体
２３ 昇降部材
２３Ａ 大径部
２３Ｂ 小径部
２３Ｓ 空間
２４、２５ 空気通路
５０ 吹上部材
５０Ａ 小径部
５０Ｂ 段差部
５０Ｃ 大経部
５０Ｓ１ 小径空間
５０Ｓ２ 大径空間
５１ 第１抵抗部材
５１Ａ 下部
５１Ｂ 上部
５１Ｅ 連通口
５２ 第２抵抗部材
５２Ｃ 連通口
６０ 弁機構体
６１ 給油口キャップ
７０ 筒本体
７１ 内筒本体部
７１Ａ 貯留部
７１Ｅ 第２側壁
７１Ｅ１ 内側面
７１Ｓ 開口
７１Ｔ 凸部
７２ 外筒本体部
７３ 連結部
７４ 取付部
７５ 収納部材
７９ フィルター
８２ 取付部材
８８ 上蓋
９８ 給油口
１００ 燃料タンク
Ｓ１ 第１空間
Ｓ２ 第２空間
Ｓ３ 開口
Ｓ３１ 第１空間
Ｓ３２ 第２空間
Ｓ３３ 第３空間
Ｓ３４ 第４空間
ＶＡ、ＶＢ、ＶＥ 弁部
ＲＡ 第１連通口
ＲＢ 第２連通口
10 Refueling port cap 12 Outer lid 13 Inner lid 15 1st air passage 15A 2nd air passage 16 Cylinder body 16E1 Inner side surface 16T Convex 17 Spring 22 Valve body 23 Elevating member 23A Large diameter 23B Small diameter 23S Space 24, 25 Air Passage 50 Blowing member
50A small diameter part
50B step
51 first resistor member between 50C Daikei unit 50S1 small space 50S2 large径空
51A lower part
51B Upper 51E Communication port 52 Second resistance member 52C Communication port 60 Valve mechanism 61 Refueling port cap 70 Cylinder body 71 Inner cylinder body 71A Storage section 71E Second side wall 71E1 Inner side surface 71S Opening
71T Convex part 72 Outer cylinder body part 73 Connecting part 74 Mounting part 75 Storage member 79 Filter 82 Mounting member
88 Top lid 98 Refueling port 100 Fuel tank S1 First space S2 Second space S3 Opening
S31 first space
S32 second space
S33 third space
S34 4th space VA, VB, VE Valve part RA 1st communication port RB 2nd communication port

Claims (2)

エンジンに供給される燃料を貯留する燃料タンクの上面に設けられた給油口を開閉すると共に閉じると前記給油口を介する前記燃料タンクと大気との連通を遮断する給油口キャップと、弁機構体とで構成される燃料タンクの弁体装置であって、
前記弁機構体は、
円筒状の外筒本体部と、該外筒本体部の略中心位置に前記外筒本体部の下部と連結部を介して連結すると共に上部に貯留部が形成される内筒本体部と、前記外筒本体部の下端部にて前記連結部とは下方へと段差を有して外方へと延びている取付部とを備え、前記内筒本体部内に形成された円柱状の第１空間、該第１空間に上方から連通する円錐台形状の第２空間、前記連結部の内側端部及び前記内筒本体部の下端部が切除されて形成されて前記第１空間に下方から連通する第３空間、前記連結部と前記取付部との段差により形成されて前記第３空間に下方から連通する第４空間及び前記第２空間を前記燃料タンク外部に連通させる開口が形成され、前記第２空間を形成する第１内側面に上下方向に長くて且つ間隔を存して内方へ突出した複数条の凸部を形成して各凸部間に形成される第１空気通路又は前記第１内側面に上下方向に長くて且つ間隔を存して複数個の凹部を形成することにより第２空気通路が形成される筒本体と、
上面を備えると共に下面を開口した有底中空円筒形状を呈して内部に空間を形成し、前記第１空間内に収納される下部の大径部と前記第２空間内に収納される外形が円錐台形状を呈する上部の小径部とを備える昇降部材と、
前記第２空間を形成する前記筒本体の前記第１内側面に突出した複数条の前記凸部に横方向の外周が点接触できる状態又は前記第１内側面に前記横方向の外周が線接触できる状態で前記昇降部材の前記小径部の上面上に載置される球状の弁体と、
前記昇降部材を押し上げて前記小径部上に載置された前記弁体の前記横方向の外周を複数条の前記凸部に押圧して点接触できるように又は前記昇降部材を押し上げて前記小径部上に載置された前記弁体の前記横方向の外周を前記筒本体の前記第１内側面に押圧して線接触できるように、前記昇降部材の前記空間内に配設されるコイルスプリングと、
前記昇降部材の前記空間内に収納される前記コイルスプリング内に遊挿されると共に小径空間が形成された小径部と、該小径部より大径でその上面上に前記コイルスプリングの下部を支承する段差部と、該段差部より大径であって前記小径空間に連通する大径空間が形成されて前記筒本体に形成した前記第４空間内に収納される大径部とを備えて中空円筒状を呈する吹上部材と、
平面視円形状を呈すると共に前記吹上部材の前記小径空間と前記燃料タンクとに連通する連通口を備えた下部と、該下部の上面中央部に立設した円柱状の上部とを備え、前記下部の上面周縁部が前記吹上部材の前記段差部の下面に当接した状態で前記吹上部材の前記大径空間内に前記下部が収納されると共に前記上部は前記吹上部材の前記小径空間を形成する第２内側面と離れた状態で前記小径空間内に収納される抵抗部材と、
前記昇降部材の前記空間内に配置した前記コイルスプリング内に、前記吹上部材の前記大径空間内に前記抵抗部材の前記下部を収納させると共に前記小径空間内に前記上部を配置させた状態の前記吹上部材を遊挿して、前記筒本体の前記第１空間及び前記第２空間内に前記弁体を上面上に載置した前記昇降部材を収納した状態で、前記筒本体の前記取付部下面に固定されると共に、前記燃料タンクに開設された開口に連通する連通路を備えて前記燃料タンクに直接に又は間接的に取り付けられる取付部材と、
中空円筒状を呈して空間内に異物を捕集して前記燃料タンク内に入り込むのを阻止する多孔質のフィルターを収納するもので、前記筒本体の前記内筒本体部に取り付けられる収納部材と、
前記収納部材内の空間と前記筒本体の前記外筒本体部内の空間とが大気と連通するように前記外筒本体部に上方から取り付けられる上蓋とを備え、
前記昇降部材上の前記弁体の前記横方向の外周が複数条の前記凸部に押圧して点接触する部位間の点接触しない前記横方向の外周の部分又は前記弁体の前記横方向の外周が前記第１内側面に押圧して線接触する部位間の線接触しない前記横方向の外周の部分と、前記弁体の中心と前記横方向の外周とを結んでできた面を外方へ延長した面で前記第１空気通路を形成する前記第１内側面及び該第１内側面の両隣の前記凸部を切断した前記第１空気通路の切り口である第１連通口又は前記弁体の中心と前記横方向の外周とを結んでできた面を外方へ延長した面で前記第２空気通路を形成する前記凹部を形成するための面を切断した前記第２空気通路の切り口である第２連通口とで面積が０．００２ｍｍ 2 以上〜０．０２ｍｍ 2 以下の弁部を構成し、
前記弁体と前記昇降部材との合計重量未満の付勢力で前記コイルスプリングが圧縮された状態で前記昇降部材及び前記弁体が下降していて、前記弁部において前記昇降部材上の前記弁体の前記横方向の外周が複数条の前記凸部に点接触していないか又は前記昇降部材上の前記弁体の前記横方向の外周が前記筒本体の前記第１内側面に線接触していない状態において、前記燃料タンクが傾斜した場合には、傾斜角度に応じて前記昇降部材と前記弁体との前記コイルスプリングに掛かる重量が減少し、前記コイルスプリングはその伸長する長さが増して所定の長さになると、前記弁体は前記筒本体の前記第１内側面の前記凸部に接触するか又は前記第１内側面に接触し、前記燃料タンクから前記取付部材の前記連通路を介する前記燃料は前記抵抗部材の前記連通口及び前記抵抗部材の前記上部が収納される前記吹上部材の前記小径空間により減圧された後、前記吹上部材の前記小径空間から前記昇降部材の前記空間内に噴出し、前記コイルスプリングの付勢力と相俟って、前記昇降部材と前記弁体を押し上げて、前記小径部上に載置された前記弁体の前記横方向の外周を複数条の前記凸部に押圧して点接触させ又は前記筒本体の前記第１内側面に押圧して線接触させ、
この弁部において前記弁体の前記横方向の外周が複数条の前記凸部に押圧して点接触又は前記筒本体の前記第１内側面に線接触した状態で、点接触しない前記横方向の外周の部分又は線接触しない前記横方向の外周の部分と前記第１連通口又は前記第２連通口とで構成される前記弁部の面積の大きさにより設定された第１通路抵抗又は第２通路抵抗と前記弁体と前記昇降部材との合計重量以上の前記コイルスプリングの付勢力の大きさとにより設定された所定の圧力値に前記燃料タンクからの前記燃料の圧力が達すると、前記抵抗部材の前記連通口、前記吹上部材の前記小径空間、前記昇降部材下端と前記吹上部材の前記大径部との隙間及び前記昇降部材と前記筒本体との隙間を介して前記第１通路抵抗に抗して前記第１空気通路内又は前記第２通路抵抗に抗して前記第２空気通路内を前記燃料が上昇して、前記弁部を通過して斜め上方に向けて上昇する前記燃料が前記コイルスプリングの付勢力に抗して前記弁体及び前記昇降部材を円錐台形状の前記第２空間内で斜め上方から下方へ下降させ、前記弁体の前記横方向の外周と複数条の前記凸部との点接触を解除するか又は前記弁体の前記横方向の外周と前記筒本体の前記内側面との線接触を解除することにより、前記燃料タンクからの前記燃料は前記筒本体の前記第１空間及び前記第２空間から前記開口を介して前記収納部材の前記空間内に流出し、流出した前記燃料は前記フィルター内部の前記空間内に吸収され、前記燃料タンクが水平状態に復帰した場合には、前記エンジンの駆動による前記燃料の消費により前記燃料タンク内の圧力が負圧になる際に、前記フィルターに吸収された前記燃料は前記貯留部に溜められると共に溜められた前記燃料は前記燃料タンクに戻される
ことを特徴とする燃料タンクの弁体装置。 When the fuel filler port provided on the upper surface of the fuel tank for storing the fuel supplied to the engine is opened and closed and closed, the fuel filler port cap that cuts off the communication between the fuel tank and the atmosphere through the fuel filler port, and the valve mechanism It is a valve body device of a fuel tank composed of
The valve mechanism is
A cylindrical outer cylinder main body, an inner cylinder main body that is connected to a substantially central position of the outer cylinder main body via a connecting portion with a lower portion of the outer cylinder main body, and an inner cylinder main body portion in which a storage portion is formed in the upper portion. A cylindrical first space formed in the inner cylinder main body portion, which is provided with a mounting portion which has a step downward and extends outward from the connecting portion at the lower end portion of the outer cylinder main body portion. , A conical trapezoidal second space communicating with the first space from above, an inner end portion of the connecting portion and a lower end portion of the inner cylinder main body portion are cut off and formed to communicate with the first space from below. An opening is formed in which a third space, a fourth space formed by a step between the connecting portion and the mounting portion and communicating with the third space from below, and the second space communicating with the outside of the fuel tank are formed. The first air passage or the first air passage formed between the convex portions by forming a plurality of convex portions protruding inward at intervals in the vertical direction on the first inner side surface forming the two spaces. 1 A cylinder body in which a second air passage is formed by forming a plurality of recesses on the inner side surface which are long in the vertical direction and at intervals.
It has a bottomed hollow cylindrical shape with an upper surface and an open lower surface to form a space inside, and the large diameter portion of the lower part housed in the first space and the outer shape housed in the second space are conical. An elevating member having a trapezoidal upper small diameter part,
A state in which the outer periphery in the lateral direction can make point contact with the convex portions of the plurality of strips protruding from the first inner side surface of the cylinder body forming the second space, or the outer circumference in the lateral direction makes line contact with the first inner surface surface. A spherical valve body that is placed on the upper surface of the small diameter portion of the elevating member in a state where it can be formed,
The elevating member is pushed up so that the lateral outer circumference of the valve body placed on the small-diameter portion is pressed against the convex portions of a plurality of rows so that point contact can be made, or the elevating member is pushed up and the small-diameter portion is pushed up. With a coil spring arranged in the space of the elevating member so that the lateral outer circumference of the valve body mounted on the valve body can be pressed against the first inner side surface of the cylinder body to make line contact. ,
A small-diameter portion that is loosely inserted into the coil spring housed in the space of the elevating member and has a small-diameter space formed, and a step that has a larger diameter than the small-diameter portion and supports the lower portion of the coil spring on the upper surface thereof. A hollow cylindrical portion including a portion and a large-diameter portion having a diameter larger than that of the step portion and communicating with the small-diameter space and being housed in the fourth space formed in the cylinder body. With the blow-up member that presents
A lower portion having a circular shape in a plan view and having a communication port for communicating with the small-diameter space of the blow-up member and the fuel tank, and a columnar upper portion erected in the center of the upper surface of the lower portion. The lower portion is housed in the large-diameter space of the blow-up member and the upper portion forms the small-diameter space of the blow-up member in a state where the upper peripheral edge portion of the blow-up member is in contact with the lower surface of the step portion of the blow-up member. A resistance member housed in the small-diameter space away from the second inner surface,
The lower part of the resistance member is housed in the large-diameter space of the blow-up member and the upper part is arranged in the small-diameter space in the coil spring arranged in the space of the elevating member. With the blow-up member loosely inserted and the elevating member on which the valve body is placed on the upper surface is housed in the first space and the second space of the cylinder body, it is placed on the lower surface of the mounting portion of the cylinder body. A mounting member that is fixed and that is directly or indirectly attached to the fuel tank with a communication passage that communicates with the opening provided in the fuel tank.
It has a hollow cylindrical shape and stores a porous filter that collects foreign matter in the space and prevents it from entering the fuel tank. With a storage member attached to the inner cylinder body of the cylinder body. ,
The space inside the storage member and the space inside the outer cylinder body of the cylinder body are provided with an upper lid attached to the outer cylinder body from above so as to communicate with the atmosphere.
The lateral outer peripheral portion of the valve body on the elevating member or the lateral outer peripheral portion of the valve body that does not make point contact between the portions where the lateral outer circumference presses against the convex portions of the plurality of strips and makes point contact. A surface formed by connecting the center of the valve body and the outer circumference in the lateral direction with the portion of the outer circumference in the lateral direction in which the outer circumference presses against the first inner surface and does not make line contact between the portions that make line contact is outward. The first communication port or the valve body which is the cut end of the first air passage formed by cutting the convex portions on both sides of the first inner side surface and the first inner side surface forming the first air passage on the surface extending to. At the cut end of the second air passage, the surface for forming the recess is cut off from the surface formed by connecting the center of the above and the outer circumference in the lateral direction and extending outward. area in there second communication port is configured to 0.002 mm 2 or more ～0.02Mm 2 or less of the valve portion,
The elevating member and the valve body are lowered in a state where the coil spring is compressed by an urging force less than the total weight of the valve body and the elevating member, and the valve body on the elevating member is lowered at the valve portion. The lateral outer circumference of the valve body is not in point contact with the convex portions of the plurality of rows, or the lateral outer circumference of the valve body on the elevating member is in line contact with the first inner side surface of the cylinder body. When the fuel tank is tilted in the absence state , the weight applied to the coil spring between the elevating member and the valve body is reduced according to the tilt angle, and the extension length of the coil spring is increased. When the valve body reaches a predetermined length, the valve body contacts the convex portion of the first inner side surface of the cylinder body or contacts the first inner side surface, and the communication passage of the mounting member from the fuel tank is reached. The fuel via the fuel is decompressed by the small diameter space of the blowing member in which the communication port of the resistance member and the upper portion of the resistance member are housed, and then from the small diameter space of the blowing member to the space of the elevating member. In combination with the urging force of the coil spring, the elevating member and the valve body are pushed up, and the outer periphery of the valve body placed on the small diameter portion in the lateral direction is covered with a plurality of the above. Press against the convex portion to make point contact, or press against the first inner side surface of the cylinder body to make line contact.
In the valve portion , the lateral outer periphery of the valve body presses against the convex portions of a plurality of strips to make point contact or line contact with the first inner side surface of the cylinder body, and the lateral direction does not make point contact. A first passage resistance or a second passage resistance set by the size of the area of the valve portion composed of the outer peripheral portion or the lateral outer peripheral portion that does not make line contact with the first communication port or the second communication port. When the pressure of the fuel from the fuel tank reaches a predetermined pressure value set by the passage resistance and the magnitude of the urging force of the coil spring equal to or greater than the total weight of the valve body and the elevating member, the resistance member Against the first passage resistance through the communication port, the small diameter space of the blow-up member, the gap between the lower end of the elevating member and the large-diameter portion of the blow-up member, and the gap between the elevating member and the cylinder body. Then, the fuel rises in the first air passage or in the second air passage against the resistance of the second passage, passes through the valve portion, and rises diagonally upward. The valve body and the elevating member are lowered from diagonally upward to downward in the conical trapezoidal second space against the urging force of the coil spring, and the lateral outer circumference of the valve body and the plurality of protrusions are convex. The fuel from the fuel tank is released from the cylinder body by releasing the point contact with the portion or by releasing the line contact between the lateral outer circumference of the valve body and the inner surface of the cylinder body. The fuel that flowed out from the first space and the second space through the opening into the space of the storage member, and the fuel that flowed out was absorbed into the space inside the filter, and the fuel tank returned to the horizontal state. In the case, when the pressure in the fuel tank becomes negative due to the consumption of the fuel by driving the engine, the fuel absorbed by the filter is stored in the storage unit and the stored fuel is stored. A fuel tank valve body device characterized by being returned to the fuel tank. エンジンに供給される燃料を貯留する燃料タンクの上面に設けられた給油口を開閉すると共に閉じると前記給油口を介する前記燃料タンクと大気との連通を遮断する給油口キャップと、弁機構体とで構成される燃料タンクの弁体装置であって、
前記弁機構体は、
円筒状の外筒本体部と、該外筒本体部の略中心位置に前記外筒本体部の下部と連結部を介して連結すると共に上部に貯留部が形成される内筒本体部と、前記外筒本体部の下端部にて前記連結部とは下方へと段差を有して外方へと延びている取付部とを備え、前記内筒本体部内に形成された円柱状の第１空間、該第１空間に上方から連通する円錐台形状の第２空間、前記連結部の内側端部及び前記内筒本体部の下端部が切除されて形成されて前記第１空間に下方から連通する第３空間、前記連結部と前記取付部との段差により形成されて前記第３空間に下方から連通する第４空間及び前記第２空間を前記燃料タンク外部に連通させる開口が形成され、前記第２空間を形成する第１内側面に上下方向に長くて且つ間隔を存して内方へ突出した複数条の凸部を形成して各凸部間に形成される第１空気通路又は前記第１内側面に上下方向に長くて且つ間隔を存して複数個の凹部を形成することにより第２空気通路が形成される筒本体と、
上面を備えると共に下面を開口した有底中空円筒形状を呈して内部に空間を形成し、前記第１空間内に収納される下部の大径部と前記第２空間内に収納される外形が円錐台形状を呈する上部の小径部とを備える昇降部材と、
前記昇降部材の前記小径部の上面上に載置されて、前記第２空間を形成する前記筒本体の前記第１内側面に突出した複数条の前記凸部に横方向の外周が点接触するか又は前記第２空間を形成する前記筒本体の前記第１内側面に前記横方向の外周が線接触する球状の弁体と、
前記昇降部材の前記空間内に配設されて、前記昇降部材を押し上げて前記小径部上に載置された前記弁体の前記横方向の外周を複数条の前記凸部に押圧して点接触するように付勢するか又は前記昇降部材を押し上げて前記小径部上に載置された前記弁体の前記横方向の外周を前記筒本体の前記第１内側面に押圧して線接触するように付勢するコイルスプリングと、
前記昇降部材の前記空間内に収納される前記コイルスプリング内に遊挿されると共に小径空間が形成された小径部と、該小径部より大径でその上面上に前記コイルスプリングの下部を支承する段差部と、該段差部より大径であって前記小径空間に連通する大径空間が形成されて前記筒本体に形成した前記第４空間内に収納される大径部とを備えて中空円筒状を呈する吹上部材と、
平面視円形状を呈すると共に前記吹上部材の前記小径空間と前記燃料タンクとに連通する連通口を備えた下部と、該下部の上面中央部に立設した円柱状の上部とを備え、前記下部の上面周縁部が前記吹上部材の前記段差部の下面に当接した状態で前記吹上部材の前記大径空間内に前記下部が収納されると共に前記上部は前記吹上部材の前記小径空間を形成する第２内側面と離れた状態で前記小径空間内に収納される抵抗部材と、
前記昇降部材の前記空間内に配置した前記コイルスプリング内に、前記吹上部材の前記大径空間内に前記抵抗部材の前記下部を収納させると共に前記小径空間内に前記上部を配置させた状態の前記吹上部材を遊挿して、前記筒本体の前記第１空間及び前記第２空間内に前記弁体を上面上に載置した前記昇降部材を収納した状態で、前記筒本体の前記取付部下面に固定されると共に、前記燃料タンクに開設された開口に連通する連通路を備えて前記燃料タンクに直接に又は間接的に取り付けられる取付部材と、
中空円筒状を呈して空間内に異物を捕集して前記燃料タンク内に入り込むのを阻止する多孔質のフィルターを収納するもので、前記筒本体の前記内筒本体部に取り付けられる収納部材と、
前記収納部材内の空間と前記筒本体の前記外筒本体部内の空間とが大気と連通するように前記外筒本体部に上方から取り付けられる上蓋とを備え、
前記昇降部材上の前記弁体の前記横方向の外周が複数条の前記凸部に押圧して点接触する部位間の点接触しない前記横方向の外周の部分又は前記弁体の前記横方向の外周が前記第１内側面に押圧して線接触する部位間の線接触しない前記横方向の外周の部分と、前記弁体の中心と前記横方向の外周とを結んでできた面を外方へ延長した面で前記第１空気通路を形成する前記第１内側面及び該第１内側面の両隣の前記凸部を切断した前記第１空気通路の切り口である第１連通口又は前記弁体の中心と前記横方向の外周とを結んでできた面を外方へ延長した面で前記第２空気通路を形成する前記凹部を形成するための面を切断した前記第２空気通路の切り口である第２連通口とで面積が０．００２ｍｍ 2 以上〜０．０２ｍｍ 2 以下の弁部を構成し、
前記弁部において前記昇降部材上の前記弁体の前記横方向の外周が複数条の前記凸部に押圧して点接触している状態又は前記昇降部材上の前記弁体の前記横方向の外周が前記筒本体の前記第１内側面に押圧して線接触している状態において、前記燃料タンク内の前記燃料が蒸発した気化ガス又は膨張した前記燃料により前記燃料タンク内の圧力が高まって、点接触しない前記横方向の外周の部分又は線接触しない前記横方向の外周の部分と前記第１連通口又は前記第２連通口とで構成される前記弁部の面積の大きさにより設定された第１通路抵抗又は第２通路抵抗と前記弁体と前記昇降部材との合計重量以上の前記コイルスプリングの付勢力の大きさとにより設定された所定の圧力値に達すると、前記抵抗部材の前記連通口、前記吹上部材の前記小径空間、前記昇降部材下端と前記吹上部材の前記大径部との隙間及び前記昇降部材と前記筒本体との隙間を介して前記第１通路抵抗に抗して前記第１空気通路内又は前記第２通路抵抗に抗して前記第２空気通路内を前記気化ガス又は前記燃料が上昇して、前記弁部を通過して斜め上方に向けて上昇する前記気化ガス又は膨張した前記燃料が前記コイルスプリングの付勢力に抗して前記弁体及び前記昇降部材を円錐台形状の前記第２空間内で斜め上方から下方へ下降させ、前記弁体の前記横方向の外周と複数条の前記凸部との点接触を解除するか又は前記弁体の前記横方向の外周と前記筒本体の前記第１内側面との線接触を解除することにより、前記燃料タンク内の過大な圧力を前記第１空間、前記第２空間及び前記開口を介して前記燃料タンク外部に放出すると共に前記フィルターに前記燃料を吸収させる
ことを特徴とする燃料タンクの弁体装置。 When the fuel filler port provided on the upper surface of the fuel tank for storing the fuel supplied to the engine is opened and closed and closed, the fuel filler port cap that cuts off the communication between the fuel tank and the atmosphere through the fuel filler port, and the valve mechanism It is a valve body device of a fuel tank composed of
The valve mechanism is
A cylindrical outer cylinder main body, an inner cylinder main body that is connected to a substantially central position of the outer cylinder main body via a connecting portion with a lower portion of the outer cylinder main body, and an inner cylinder main body portion in which a storage portion is formed in the upper portion. A cylindrical first space formed in the inner cylinder main body portion, which is provided with a mounting portion which has a step downward and extends outward from the connecting portion at the lower end portion of the outer cylinder main body portion. , A conical trapezoidal second space communicating with the first space from above, an inner end portion of the connecting portion and a lower end portion of the inner cylinder main body portion are cut off and formed to communicate with the first space from below. An opening is formed in which a third space, a fourth space formed by a step between the connecting portion and the mounting portion and communicating with the third space from below, and the second space communicating with the outside of the fuel tank are formed. The first air passage or the first air passage formed between the convex portions by forming a plurality of convex portions protruding inward at intervals in the vertical direction on the first inner side surface forming the two spaces. 1 A cylinder body in which a second air passage is formed by forming a plurality of recesses on the inner side surface which are long in the vertical direction and at intervals.
It has a bottomed hollow cylindrical shape with an upper surface and an open lower surface to form a space inside, and the large diameter portion of the lower part housed in the first space and the outer shape housed in the second space are conical. An elevating member having a trapezoidal upper small diameter part,
The outer circumference in the lateral direction makes point contact with the convex portions of the plurality of strips that are placed on the upper surface of the small diameter portion of the elevating member and project to the first inner side surface of the cylinder body that forms the second space. Alternatively, a spherical valve body in which the outer circumference in the lateral direction is in line contact with the first inner side surface of the cylinder body forming the second space.
The elevating member is arranged in the space, and the elevating member is pushed up to press the lateral outer circumference of the valve body placed on the small diameter portion against the convex portions of a plurality of rows to make point contact. The elevating member is pushed up so as to press the lateral outer circumference of the valve body mounted on the small diameter portion against the first inner side surface of the cylinder body so as to make line contact. and a coil spring for biasing,
A small-diameter portion that is loosely inserted into the coil spring housed in the space of the elevating member and has a small-diameter space formed, and a step that has a larger diameter than the small-diameter portion and supports the lower portion of the coil spring on the upper surface thereof. A hollow cylindrical portion including a portion and a large-diameter portion having a diameter larger than that of the step portion and communicating with the small-diameter space and being housed in the fourth space formed in the cylinder body. With the blow-up member that presents
A lower portion having a circular shape in a plan view and having a communication port for communicating with the small-diameter space of the blow-up member and the fuel tank, and a columnar upper portion erected in the center of the upper surface of the lower portion. The lower portion is housed in the large-diameter space of the blow-up member and the upper portion forms the small-diameter space of the blow-up member in a state where the upper peripheral edge portion of the blow-up member is in contact with the lower surface of the step portion of the blow-up member. A resistance member housed in the small-diameter space away from the second inner surface,
The lower part of the resistance member is housed in the large-diameter space of the blow-up member and the upper part is arranged in the small-diameter space in the coil spring arranged in the space of the elevating member. With the blow-up member loosely inserted and the elevating member on which the valve body is placed on the upper surface is housed in the first space and the second space of the cylinder body, it is placed on the lower surface of the mounting portion of the cylinder body. A mounting member that is fixed and that is directly or indirectly attached to the fuel tank with a communication passage that communicates with the opening provided in the fuel tank.
It has a hollow cylindrical shape and stores a porous filter that collects foreign matter in the space and prevents it from entering the fuel tank. With a storage member attached to the inner cylinder body of the cylinder body. ,
The space inside the storage member and the space inside the outer cylinder body of the cylinder body are provided with an upper lid attached to the outer cylinder body from above so as to communicate with the atmosphere.
The lateral outer peripheral portion of the valve body on the elevating member or the lateral outer peripheral portion of the valve body that does not make point contact between the portions where the lateral outer circumference presses against the convex portions of the plurality of strips and makes point contact. A surface formed by connecting the center of the valve body and the outer circumference in the lateral direction with the portion of the outer circumference in the lateral direction in which the outer circumference presses against the first inner surface and does not make line contact between the portions that make line contact is outward. The first communication port or the valve body which is the cut end of the first air passage formed by cutting the convex portions on both sides of the first inner side surface and the first inner side surface forming the first air passage on the surface extending to. At the cut end of the second air passage, the surface for forming the recess is cut off from the surface formed by connecting the center of the above and the outer circumference in the lateral direction and extending outward. area in there second communication port is configured to 0.002 mm 2 or more ～0.02Mm 2 or less of the valve portion,
In the valve portion, the lateral outer circumference of the valve body on the elevating member is pressed against the plurality of convex portions and is in point contact, or the lateral outer circumference of the valve body on the elevating member. In a state where the fuel is pressed against the first inner surface of the cylinder body and is in line contact with the fuel, the pressure in the fuel tank is increased by the vaporized gas in which the fuel in the fuel tank is evaporated or the expanded fuel. It is set by the size of the area of the valve portion composed of the lateral outer peripheral portion that does not make point contact or the lateral outer peripheral portion that does not make line contact and the first communication port or the second communication port. When a predetermined pressure value set by the magnitude of the urging force of the coil spring equal to or greater than the total weight of the first passage resistance or the second passage resistance, the valve body, and the elevating member is reached, the communication of the resistance member is reached. The mouth, the small diameter space of the blow-up member, the gap between the lower end of the elevating member and the large-diameter portion of the blow-up member, and the gap between the elevating member and the cylinder body, against the first passage resistance. The vaporized gas or the fuel rises in the first air passage or in the second air passage against the resistance of the second passage, passes through the valve portion, and rises diagonally upward. Alternatively, the expanded fuel causes the valve body and the elevating member to descend from diagonally upward to downward in the conical trapezoidal second space against the urging force of the coil spring, and the valve body in the lateral direction. Inside the fuel tank by releasing the point contact between the outer periphery and the plurality of convex portions, or by releasing the line contact between the lateral outer circumference of the valve body and the first inner side surface of the cylinder body . A fuel tank valve body device, characterized in that an excessive pressure is discharged to the outside of the fuel tank through the first space, the second space, and the opening, and the filter absorbs the fuel.
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