JP6765937B2 - Fuel tank valve gear - Google Patents
Fuel tank valve gear Download PDFInfo
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- JP6765937B2 JP6765937B2 JP2016216285A JP2016216285A JP6765937B2 JP 6765937 B2 JP6765937 B2 JP 6765937B2 JP 2016216285 A JP2016216285 A JP 2016216285A JP 2016216285 A JP2016216285 A JP 2016216285A JP 6765937 B2 JP6765937 B2 JP 6765937B2
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Description
本発明は、自動車等の燃料タンクに取付けられ、機能が異なる２つの弁を備える、燃料タンク用弁装置に関する。 The present invention relates to a fuel tank valve device which is attached to a fuel tank of an automobile or the like and includes two valves having different functions.
自動車の燃料タンクには、燃料タンク内の液面が、予め設定された満タン液面よりも上昇しないように、燃料タンク内への過給油を防止する満タン規制弁や、自動車が旋回したり傾いたりしたときに、燃料タンク内の燃料が、燃料タンク外へ漏れるのを防止する燃料流出防止弁等が取付けられている。各弁は単独であることが多いが、２つの弁を備える弁装置も知られている。 The fuel tank of an automobile has a full tank control valve that prevents overfueling into the fuel tank so that the liquid level in the fuel tank does not rise above the preset full tank liquid level, and the automobile turns. A fuel outflow prevention valve or the like is installed to prevent the fuel in the fuel tank from leaking to the outside of the fuel tank when the fuel is tilted or tilted. Each valve is often independent, but valve devices with two valves are also known.
例えば、下記特許文献１には、内部に燃料タンク内に連通する弁室を有し、上壁部の中央に、弁室と外部通路とを連通させる内側接続通路を形成し、その周囲に外側接続通路を形成したケーシングと、前記弁室に昇降可能に収納されて、前記外側接続通路を開閉する外側フロート部と、この外側フロート部の内側に、昇降可能に収納されて、前記内側接続通路を開閉する内側フロート部とを備えた、燃料遮断弁が記載されている。そして、燃料タンク内に燃料が供給され、燃料液位が第１液位に達すると、外側フロート部が上昇して外側接続通路を閉じて、それ以上の燃料供給が規制される。一方、車両の旋回等によって、燃料タンク内で燃料が揺動して、燃料液位が第２液位に達すると、外側フロート部及び内側フロート部の両方が上昇して、外側接続通路及び内側接続通路を閉じることで、タンク外への燃料流出防止されるようになっている。 For example, Patent Document 1 below has a valve chamber that communicates with the inside of the fuel tank, an inner connecting passage that communicates the valve chamber and the external passage is formed in the center of the upper wall portion, and the outside is formed around the valve chamber. The casing formed with the connecting passage, the outer float portion that is retractably housed in the valve chamber to open and close the outer connecting passage, and the inner side of the outer float portion that is retractably stored and is stored in the inner connecting passage. A fuel shutoff valve with an inner float that opens and closes is described. Then, when fuel is supplied into the fuel tank and the fuel liquid level reaches the first liquid level, the outer float portion rises and closes the outer connecting passage, and further fuel supply is regulated. On the other hand, when the fuel swings in the fuel tank due to the turning of the vehicle and the fuel liquid level reaches the second liquid level, both the outer float portion and the inner float portion rise, and the outer connecting passage and the inner side are connected. By closing the connecting passage, fuel outflow to the outside of the tank is prevented.
上記燃料遮断弁の場合、外側フロート部及び内側フロート部の両方が上昇して、外側接続通路及び内側接続通路を閉じた状態では、燃料タンク内の燃料蒸気をタンク外に排出できず、燃料タンク内の圧力が上昇するため、どちらかの接続通路を開く必要がある。 In the case of the above fuel shutoff valve, when both the outer float portion and the inner float portion are raised and the outer connecting passage and the inner connecting passage are closed, the fuel steam in the fuel tank cannot be discharged to the outside of the tank, and the fuel tank. As the pressure inside increases, it is necessary to open either connection passage.
この場合、燃料液位が第２液位よりも下がれば、内側フロート部が先に下降するはずであるが、タンク内圧が高いと、内側フロート部が内側接続通路の開口周縁部に貼り付いてしまって、内側フロート部を、その自重だけでは下降させることができないことがあった。 In this case, if the fuel liquid level is lower than the second liquid level, the inner float part should go down first, but if the tank internal pressure is high, the inner float part sticks to the opening peripheral edge of the inner connecting passage. In some cases, the inner float part could not be lowered by its own weight alone.
したがって、本発明の目的は、異なる弁座を各々有する２つのフロート弁を備える弁装置において、各フロート弁が各弁座をそれぞれ閉じ、タンク内圧が高い状態であっても、燃料液面が所定位置まで下がれば、少なくとも一方の弁座を確実に開くことができる、燃料タンク用弁装置を提供することにある。 Therefore, an object of the present invention is that in a valve device including two float valves having different valve seats, the fuel liquid level is predetermined even when each float valve closes each valve seat and the tank internal pressure is high. An object of the present invention is to provide a valve device for a fuel tank that can surely open at least one of the valve seats when lowered to the position.
上記目的を達成するため、本発明の燃料タンク用弁装置は、仕切壁を介して、下方に燃料タンクに連通する弁室、上方に燃料蒸気排出口に連通する通気室が設けられ、前記仕切壁に前記弁室と前記通気室を連通する第１開口が設けられ、該第１開口の周縁に第１弁座が形成されたハウジングと、前記弁室に昇降可能に収容され、前記第１弁座を開閉し、かつ、内部に収容部が形成されると共に、該収容部と前記通気室を連通させる第２開口が設けられ、該第２開口の周縁に第２弁座が形成された第１フロート弁と、 前記第１フロート弁の収容部内に昇降可能に配置され、前記第２弁座を開閉する第２フロート弁とを備え、前記第１フロート弁は、アッパー部材と、該アッパー部材に対して所定距離だけ昇降可能に装着されたロアー部材とを有し、前記ロアー部材は、フロート本体を有し、該フロート本体の内部に、前記第２フロート弁を所定距離だけ昇降可能に収容する前記収容部が形成され、前記ロアー部材の下降時に前記第２フロート弁を押圧する押圧部が設けられており、前記アッパー部材は、前記第１弁座に当接するシール部と、前記第２開口とを有し、前記第２フロート弁は、前記ロアー部材が下降するとき、前記ロアー部材の前記押圧部に当接する受け部を有しており、前記第１フロート弁のロアー部材及びアッパー部材が最大限に上昇して前記第１弁座が前記第１フロート弁によって閉じられ、前記第２フロート弁は前記ロアー部材に対して更に上昇して前記第２弁座を閉じるように構成されており、前記第１フロート弁のロアー部材、アッパー部材及び前記第２フロート弁がいずれも最大限に上昇して、前記第１弁座が前記第１フロート弁によって閉じられ、かつ、前記第２弁座が前記第２フロート弁で閉じられた状態で、前記アッパー部材に対して前記ロアー部材が独自に下降可能な距離よりも、前記第２フロート弁に対して前記ロアー部材が独自に下降可能な距離の方が短く設定されていることを特徴とする。 In order to achieve the above object, the fuel tank valve device of the present invention is provided with a valve chamber that communicates with the fuel tank below and a ventilation chamber that communicates with the fuel vapor discharge port above through the partition wall. A housing in which a first opening for communicating the valve chamber and the ventilation chamber is provided on the wall and a first valve seat is formed on the periphery of the first opening, and a housing which is housed in the valve chamber so as to be able to move up and down. The valve seat was opened and closed, and an accommodating portion was formed inside, and a second opening was provided to communicate the accommodating portion with the ventilation chamber, and a second valve seat was formed on the periphery of the second opening. The first float valve is provided with a first float valve and a second float valve which is vertically arranged in the accommodating portion of the first float valve and opens and closes the second valve seat. The first float valve includes an upper member and the upper. It has a lower member mounted so as to be able to move up and down by a predetermined distance with respect to the member, and the lower member has a float body, and the second float valve can be raised and lowered by a predetermined distance inside the float body. The accommodating portion for accommodating is formed, and a pressing portion for pressing the second float valve when the lower member is lowered is provided. The upper member includes a seal portion that abuts on the first valve seat and the first valve seat. The second float valve has two openings, and has a receiving portion that comes into contact with the pressing portion of the lower member when the lower member is lowered, and the lower member and the upper of the first float valve. The member is configured to be maximally raised to close the first valve seat by the first float valve, and the second float valve to be further raised relative to the lower member to close the second valve seat. The lower member, the upper member, and the second float valve of the first float valve are all raised to the maximum, the first valve seat is closed by the first float valve, and the second is. With the valve seat closed by the second float valve, the lower member can independently descend with respect to the second float valve than the distance at which the lower member can independently descend with respect to the upper member. The feature is that the distance is set shorter.
本発明によれば、燃料液面が上昇して満タン規制すべき高さになると、第１フロート弁が上昇して第１弁体によって第１開口が閉じて、満タン規制がなされる。このとき、第２開口は開いた状態を維持する。 According to the present invention, when the fuel liquid level rises to a height at which the full tank should be regulated, the first float valve rises and the first opening is closed by the first valve body to regulate the full tank. At this time, the second opening is kept open.
そして、車両旋回や燃料揺動等によって、燃料液面が上記よりも更に上昇したときは、第１フロート弁が上昇して第１弁座が閉じるだけでなく、第１フロート弁に対して第２フロート弁が更に上昇して、第２フロート弁によって第２弁座も閉じる。これによって、燃料が通気室側に漏れることを抑制できる。一方、この状態では、タンク内圧が高く、燃料液面が下がっても、第１フロート弁及び第２フロート弁が、第１弁座や第２弁座を閉じた状態に維持されることがあるが、第１フロート弁をアッパー部材とロアー部材とで構成し、アッパー部に対してロアー部材を所定距離だけ昇降可能として、かつ、同状態で、アッパー部材に対してロアー部材が独自に下降可能な距離よりも、第２フロート弁に対してロアー部材が独自に下降可能な距離の方が短く設定されているため、上記状態から、燃料液面が下がれば、アッパー部材が第１弁座が貼り付いたままでも、ロアー部材が下降して、その押圧部が第２フロート弁の受け部に当接し、第２フロート弁を押圧するので、第２フロート弁には、その自重以外に第１フロート弁のロアー部材による押圧力が加わることになり、その結果、第２フロート弁が下降しやすくなり、第２弁座を確実に開くことができる。 When the fuel liquid level rises further than the above due to vehicle turning, fuel rocking, etc., the first float valve rises and not only the first valve seat closes, but also the first float valve with respect to the first float valve. The 2 float valve rises further and the 2nd float valve closes the 2nd valve seat. As a result, it is possible to prevent the fuel from leaking to the ventilation chamber side. On the other hand, in this state, even if the tank internal pressure is high and the fuel liquid level drops, the first float valve and the second float valve may be maintained in a state in which the first valve seat and the second valve seat are closed. However, the first float valve is composed of an upper member and a lower member so that the lower member can be raised and lowered by a predetermined distance with respect to the upper portion, and in the same state, the lower member can be independently lowered with respect to the upper member. Since the distance at which the lower member can independently descend with respect to the second float valve is set shorter than the distance, if the fuel liquid level drops from the above state, the upper member will move to the first valve seat. Even if the lower member is still stuck, the lower member descends, the pressing portion abuts on the receiving portion of the second float valve, and the second float valve is pressed. Therefore, the second float valve has the first weight in addition to its own weight. A pressing force is applied by the lower member of the float valve, and as a result, the second float valve is easily lowered, and the second valve seat can be reliably opened.
以下、図１〜１２を参照して、本発明の燃料タンク用弁装置の一実施形態について説明する。なお、以下の説明において、「燃料」とは、液体の燃料（燃料の飛沫も含む）を意味し、「燃料蒸気」とは、蒸発した燃料を意味するものとする。 Hereinafter, an embodiment of the fuel tank valve device of the present invention will be described with reference to FIGS. 1 to 12. In the following description, the "fuel" means a liquid fuel (including droplets of fuel), and the "fuel vapor" means an evaporated fuel.
図１及び図６に示すように、この実施形態における燃料タンク用弁装置１０（以下、「弁装置１０」という）は、略筒状をなし上方に仕切壁２１を設けたケーシング２０と、該ケーシング２０の上方に装着されるカバー部材３０と、前記ケーシング２０の下方に装着されるキャップ３７とを有する、ハウジング１５を有している。 As shown in FIGS. 1 and 6, the fuel tank valve device 10 (hereinafter referred to as “valve device 10”) in this embodiment has a casing 20 having a substantially tubular shape and an upper partition wall 21 and the same. It has a housing 15 having a cover member 30 mounted above the casing 20 and a cap 37 mounted below the casing 20.
そして、図６に示すように、ケーシング２０の下方にキャップ３７が装着されることで、仕切壁２１を介して、ハウジング下方に図示しない燃料タンクに連通する弁室Ｒ１が形成され、ケーシング２０の上方にカバー部材３０が装着されることで、仕切壁２１を介して、ハウジング上方に燃料蒸気排出口３４に連通する通気室Ｒ２が形成されるようになっている。 Then, as shown in FIG. 6, by mounting the cap 37 below the casing 20, a valve chamber R1 communicating with a fuel tank (not shown) is formed below the housing via the partition wall 21, and the casing 20 is formed. By mounting the cover member 30 on the upper side, a ventilation chamber R2 communicating with the fuel vapor discharge port 34 is formed above the housing through the partition wall 21.
前記仕切壁２１には、円形の第１開口２３が形成されており、この第１開口２３を通じて、前記弁室Ｒ１と前記通気室Ｒ２とが連通するようになっている。なお、第１開口２３の下面側周縁からは、所定高さで第１弁座２３ａが突出している。また、ケーシング２０の上方外周には、凹溝２５を介してシールリング２６が装着されている。更に、ケーシング２０の外周面には、複数の係止突起２７，２８が突設されている。 A circular first opening 23 is formed in the partition wall 21, and the valve chamber R1 and the ventilation chamber R2 communicate with each other through the first opening 23. The first valve seat 23a protrudes from the lower surface side peripheral edge of the first opening 23 at a predetermined height. Further, a seal ring 26 is mounted on the upper outer circumference of the casing 20 via a concave groove 25. Further, a plurality of locking projections 27 and 28 are provided so as to project from the outer peripheral surface of the casing 20.
また、図１に示すように、前記カバー部材３０は、上方が閉塞し下方が開口した略円筒状をなした筒部３１と、該筒部３１の下方開口から外径方向に広がったフランジ部３２と、該フランジ部３２の外周から垂設された複数の係止片３３とを有している。そして、係止片３３の係止孔３３ａを、前記ケーシング２０の係止突起２７に係止させることで、ケーシング２０の上方にカバー部材３０が装着される。また、図６に示すように、筒部３１の周壁に前記燃料蒸気排出口３４が形成されており、該燃料蒸気排出口３４の表側周縁から、燃料タンク外に配置される配管との接続用の燃料蒸気配管３５が延出されている。 Further, as shown in FIG. 1, the cover member 30 has a substantially cylindrical tubular portion 31 whose upper portion is closed and whose lower portion is opened, and a flange portion which extends in the outer diameter direction from the lower opening of the tubular portion 31. It has 32 and a plurality of locking pieces 33 vertically hung from the outer periphery of the flange portion 32. Then, the cover member 30 is mounted above the casing 20 by locking the locking hole 33a of the locking piece 33 to the locking projection 27 of the casing 20. Further, as shown in FIG. 6, the fuel vapor discharge port 34 is formed on the peripheral wall of the tubular portion 31, and is for connecting to a pipe arranged outside the fuel tank from the front peripheral edge of the fuel vapor discharge port 34. The fuel steam pipe 35 of the above is extended.
更に図１に示すように、前記キャップ３７は、その周壁に複数の係止孔３８が形成されており、該係止孔３８に前記ケーシング２０の係止突起２８が係止することで、ケーシング２０の下方にキャップ３７が装着される。また、キャップ３７の底面側には、弁室Ｒ１に連通する通口３９が形成されている（図１参照）。 Further, as shown in FIG. 1, a plurality of locking holes 38 are formed in the peripheral wall of the cap 37, and the locking projections 28 of the casing 20 are locked in the locking holes 38 to lock the casing. A cap 37 is attached below the 20. Further, on the bottom surface side of the cap 37, a passage port 39 communicating with the valve chamber R1 is formed (see FIG. 1).
そして、この弁装置１０は、弁室Ｒ１に昇降可能に収容され、第１弁座２３ａを開閉し、かつ、内部に収容部４７が形成されると共に、この収容部４７と前記通気室Ｒ２を連通させる第２開口６５が設けられ、この第２開口６５の周縁に第２弁座６５ａが形成された第１フロート弁４０と、この第１フロート弁４０の収容部４７内に昇降可能に配置され、第２弁座６５ａを開閉する第２フロート弁７０とを備えている（図１及び図６参照）。 Then, the valve device 10 is housed in the valve chamber R1 so as to be able to move up and down, opens and closes the first valve seat 23a, forms a housing part 47 inside, and accommodates the housing part 47 and the ventilation chamber R2. A first float valve 40 is provided with a second opening 65 for communication, and a second valve seat 65a is formed on the peripheral edge of the second opening 65, and the first float valve 40 is arranged so as to be able to move up and down in the accommodating portion 47 of the first float valve 40. It is provided with a second float valve 70 that opens and closes the second valve seat 65a (see FIGS. 1 and 6).
まず、第１フロート弁４０の構造について説明する。図２及び図３に示すように、この第１フロート弁４０は、アッパー部材６０と、該アッパー部材６０に対して所定距離だけ昇降可能に装着されたロアー部材４１とを有している。 First, the structure of the first float valve 40 will be described. As shown in FIGS. 2 and 3, the first float valve 40 has an upper member 60 and a lower member 41 mounted on the upper member 60 so as to be able to move up and down by a predetermined distance.
前記ロアー部材４１は、略円筒状をなしており、燃料浸漬時に浮力を生じさせるフロート本体４３を有している。このフロート本体４３の上方には、段状の肩部４３ａを介して、フロート本体４３の外周よりも縮径した、略円筒状をなした筒状部４４が設けられている。また、この筒状部４４の上方外周からは、環状に突出した係止部４４ａが設けられている。この係止部４４ａは、アッパー部材６０に対してロアー部材４１が最大限下降した時に、アッパー部材６０の後述するフック６３ｂに係止するようになっている（図３及び図１２参照）。更に、筒状部４４の上端面からは、複数の突出部４４ｂが突出されている。 The lower member 41 has a substantially cylindrical shape, and has a float body 43 that generates buoyancy when immersed in fuel. Above the float main body 43, a substantially cylindrical tubular portion 44 having a diameter smaller than the outer circumference of the float main body 43 is provided via a stepped shoulder portion 43a. Further, a locking portion 44a protruding in an annular shape is provided from the upper outer circumference of the tubular portion 44. The locking portion 44a is adapted to be locked to the hook 63b described later of the upper member 60 when the lower member 41 is lowered to the maximum with respect to the upper member 60 (see FIGS. 3 and 12). Further, a plurality of projecting portions 44b project from the upper end surface of the tubular portion 44.
また、フロート本体４３の内部には、第２フロート弁７０を所定距離だけ昇降可能に収容する収容部４７が設けられている（図３及び図６〜１２参照）。図２や図３に示すように、この実施形態の収容部４７は、筒状部４４の上方開口から、フロート本体４３の軸方向所定位置に至る深さで、円形凹状に形成されており、その下端には下側壁部４８が形成されている。更に、フロート本体４３の底面側には、上方に向いた凹状をなした凹部４９が形成されている。この凹部４９にはスプリングを配置してもよい。このようなスプリングを配置した場合には、ロアー部材４１の燃料浸漬時に、ロアー部材４１を上昇させやすくする。 Further, inside the float main body 43, an accommodating portion 47 for accommodating the second float valve 70 so as to be able to move up and down by a predetermined distance is provided (see FIGS. 3 and 6 to 12). As shown in FIGS. 2 and 3, the accommodating portion 47 of this embodiment is formed in a circular concave shape at a depth from the upper opening of the tubular portion 44 to a predetermined position in the axial direction of the float main body 43. A lower side wall portion 48 is formed at the lower end thereof. Further, on the bottom surface side of the float main body 43, a concave recess 49 having an upward concave shape is formed. A spring may be arranged in the recess 49. When such a spring is arranged, the lower member 41 is easily raised when the lower member 41 is immersed in fuel.
また、収容部４７の下側壁部４８には、対向して配置された一対の下端開口５１，５１が、前記凹部４９に連通するように形成されている（図３参照）。この下端開口５１は、１個又は３個以上であってもよく、特に限定はない。そして、図９〜１１に示すように、この下端開口５１の下面側周縁が、アッパー部材６０に対してロアー部材４１が下降するときに、第２フロート弁７０を押圧する押圧部５３をなしている。すなわち、この押圧部５３が、第２フロート弁７０に配置された、本発明の「受け部」をなす環状部材８０に当接することで、ロアー部材４１の自重による押圧力Ｇが、環状部材８０を介して第２フロート弁７０に作用するようになっている（図９〜１１参照）。 Further, a pair of lower end openings 51, 51 arranged to face each other are formed in the lower side wall portion 48 of the accommodating portion 47 so as to communicate with the recess 49 (see FIG. 3). The lower end opening 51 may be one or three or more, and is not particularly limited. Then, as shown in FIGS. 9 to 11, the lower surface side peripheral edge of the lower end opening 51 forms a pressing portion 53 that presses the second float valve 70 when the lower member 41 descends with respect to the upper member 60. There is. That is, when the pressing portion 53 abuts on the annular member 80 forming the "receiving portion" of the present invention arranged on the second float valve 70, the pressing force G due to the own weight of the lower member 41 is reduced to the annular member 80. It acts on the second float valve 70 via the (see FIGS. 9 to 11).
なお、本発明における「押圧部」としては、例えば、下端開口５１の周縁部に設けられた突起としたり、或いは、下端開口側ではなく、収容部４７の内周面に凸部や凹部を設けておき、これらが第２フロート弁７０側の受け部に当接したりするようにしてもよい。すなわち、ロアー部材４１の下降時に、第２フロート弁７０側の受け部に当接して、ロアー部材４１の自重による押圧力Ｇを作用可能であれば、どのような構造であっても構わない。 The "pressing portion" in the present invention may be, for example, a protrusion provided on the peripheral edge of the lower end opening 51, or a convex portion or a concave portion may be provided on the inner peripheral surface of the accommodating portion 47 instead of the lower end opening side. In addition, these may come into contact with the receiving portion on the second float valve 70 side. That is, any structure may be used as long as it comes into contact with the receiving portion on the second float valve 70 side when the lower member 41 is lowered and the pressing force G due to the weight of the lower member 41 can be applied.
一方、前記アッパー部材６０は、図２及び図３に示すように、略円筒状をなした筒状部６１と、該筒状部６１の下端から外方に広がる環状の拡径壁部６２と、該拡径壁部６２の外周縁から垂設した、複数の通口６３ａを有する円筒枠状をなし、ロアー部材４１の筒状部４４の外周に配置される枠状壁部６３とを有している。このアッパー部材６０は、前記ロアー部材４１の上方の筒状部４４の外側に、ロアー部材４１に対して昇降可能に配置されており、常時はアッパー部材６０の拡径壁部６２の下面が、ロアー部材４１の筒状部４４の突出部４４ｂに支持された状態となっている（図６参照）。 On the other hand, as shown in FIGS. 2 and 3, the upper member 60 includes a cylindrical portion 61 having a substantially cylindrical shape, and an annular diameter-expanding wall portion 62 extending outward from the lower end of the tubular portion 61. It has a cylindrical frame shape having a plurality of through ports 63a, which is vertically hung from the outer peripheral edge of the diameter-expanded wall portion 62, and has a frame-shaped wall portion 63 arranged on the outer periphery of the tubular portion 44 of the lower member 41. are doing. The upper member 60 is arranged outside the tubular portion 44 above the lower member 41 so as to be able to move up and down with respect to the lower member 41, and the lower surface of the diameter-expanded wall portion 62 of the upper member 60 is always formed. It is in a state of being supported by the protruding portion 44b of the tubular portion 44 of the lower member 41 (see FIG. 6).
また、筒状部６１の上方内周には、支持壁部６４が設けられている。この支持壁部６４の中央に、前記第２開口６５が形成されている。なお、第２開口６５の下面側周縁からは、筒状をなした第２弁座６５ａが突設されている。また、この第２開口６５の開口面積は、前記第１開口２３の開口面積よりも小さく形成されている。 Further, a support wall portion 64 is provided on the upper inner circumference of the tubular portion 61. The second opening 65 is formed in the center of the support wall portion 64. A tubular second valve seat 65a is projected from the lower surface side peripheral edge of the second opening 65. Further, the opening area of the second opening 65 is formed to be smaller than the opening area of the first opening 23.
前記支持壁部６４には、円板状の板状弁６６が配置されている。この板状弁６６は、その自重によって、常時は第２開口６５の上方開口を閉塞しており、燃料タンク内の圧力上昇に伴って押し上げられることで、第２開口６５を開いて、燃料蒸気を燃料タンク外へ逃がすものである。なお、この板状弁６６は配置しなくてもよい。また、アッパー部材６０には、板状弁６６の代わりに、チェックバルブのような２ＷＡＹバルブを設けてもよい。更に、筒状部６１の上方開口には蓋体６７が装着されており、板状弁６６の抜け止めが図られている。 A disc-shaped plate-shaped valve 66 is arranged on the support wall portion 64. The plate-shaped valve 66 always closes the upper opening of the second opening 65 due to its own weight, and is pushed up as the pressure in the fuel tank rises to open the second opening 65 and fuel vapor. To escape to the outside of the fuel tank. The plate-shaped valve 66 does not have to be arranged. Further, the upper member 60 may be provided with a 2-way valve such as a check valve instead of the plate-shaped valve 66. Further, a lid body 67 is attached to the upper opening of the tubular portion 61 to prevent the plate-shaped valve 66 from coming off.
また、筒状部６１の下端外周には、環状溝６１ａが形成されている。この環状溝６１ａに、ゴム等の弾性部材から形成された環状をなした、シール部６８が装着されている。このシール部６８は、その内周が肉厚形状をなし、該肉厚部から薄肉フランジ状の周縁部が延びており、この周縁部が前記第１弁座２３ａに接離して、同第１弁座２３ａを開閉する（第１開口２３を開閉する）。なお、この実施形態のシール部６８は、アッパー部材６０と別体であるが、アッパー部材６０と一体的に設けてもよい、例えば、アッパー部材６０の肩部（拡径壁部６２の外周部）をシール部としてもよい。 An annular groove 61a is formed on the outer periphery of the lower end of the tubular portion 61. An annular seal portion 68 formed of an elastic member such as rubber is attached to the annular groove 61a. The inner circumference of the seal portion 68 has a thick wall shape, and a thin flange-shaped peripheral edge portion extends from the thick wall portion, and this peripheral edge portion is brought into contact with and separated from the first valve seat 23a, and the first The valve seat 23a is opened and closed (the first opening 23 is opened and closed). Although the seal portion 68 of this embodiment is separate from the upper member 60, it may be provided integrally with the upper member 60, for example, the shoulder portion of the upper member 60 (the outer peripheral portion of the enlarged diameter wall portion 62). ) May be used as a seal portion.
更に、図２に示すように、前記枠状壁部６３の各通口６３ａの下方側内周縁からは、フック６３ｂが突設されている。このフック６３ｂには、アッパー部材６０に対してロアー部材４１が最大限下降した時に、ロアー部材４１の係止部４４ａが係止して（図３及び図１２参照）、それによってロアー部材４１とアッパー部材６０との抜け止めが図られている。 Further, as shown in FIG. 2, a hook 63b is projected from the lower inner peripheral edge of each through port 63a of the frame-shaped wall portion 63. When the lower member 41 is lowered to the maximum with respect to the upper member 60, the locking portion 44a of the lower member 41 is locked to the hook 63b (see FIGS. 3 and 12), whereby the lower member 41 and the lower member 41 are engaged. It is designed to prevent it from coming off from the upper member 60.
次に、第２フロート弁７０の構造について説明する。図４及び図５に示すように、この実施形態の第２フロート弁７０は、略円筒状をなし燃料浸漬時に浮力を生じさせるフロート本体７１と、該フロート本体７１の上方に揺動可能に装着されるシールキャップ７５と、前記フロート本体７１の下方に装着される、環状をなした環状部材８０とを有している。 Next, the structure of the second float valve 70 will be described. As shown in FIGS. 4 and 5, the second float valve 70 of this embodiment has a substantially cylindrical shape and is swingably mounted on a float main body 71 that generates buoyancy when immersed in fuel and above the float main body 71. It has a seal cap 75 to be formed, and an annular member 80 having an annular shape, which is attached below the float main body 71.
図４に示すように、前記環状部材８０の内周側には、段部８１が形成されている。また、環状部材８０の一端面側（下面側）には、平坦面状をなした係止面８２が形成されている。更に環状部材８０の他端面側（上面側）には、周方向の所定箇所が高く、この高い箇所８３ａ（以下、「高所８３ａ」という）に対して、周方向の対向箇所に向けて次第に低くなるように傾斜した、傾斜面８３が形成されている（図４及び図５参照）。 As shown in FIG. 4, a step portion 81 is formed on the inner peripheral side of the annular member 80. Further, a locking surface 82 having a flat surface shape is formed on one end surface side (lower surface side) of the annular member 80. Further, a predetermined portion in the circumferential direction is high on the other end surface side (upper surface side) of the annular member 80, and gradually toward the opposite portion in the circumferential direction with respect to the high portion 83a (hereinafter referred to as "high place 83a"). An inclined surface 83 is formed which is inclined so as to be low (see FIGS. 4 and 5).
前記フロート本体７１の上方には、段状の肩部７１ａを介して、フロート本体７１の外周よりも縮径した、略円形状の頭部７２が設けられている。この頭部７２の上方外周には、環状突起状をなした係止部７２ａが設けられている。また、頭部７２の上面中央には、山形突起状をなした支持部７２ｂが突設されている。なお、図５に示すように、フロート本体７１の内側には、その底面から前記支持部７２ｂに至る高さで、上方に向いた凹状をなした肉抜き凹部７３が形成されている。 Above the float body 71, a substantially circular head 72 having a diameter smaller than the outer circumference of the float body 71 is provided via a stepped shoulder portion 71a. A locking portion 72a having an annular protrusion shape is provided on the upper outer circumference of the head 72. Further, a support portion 72b having a chevron-shaped protrusion is projected from the center of the upper surface of the head 72. As shown in FIG. 5, a lightening recess 73 having a concave shape facing upward is formed inside the float main body 71 at a height extending from the bottom surface to the support portion 72b.
また、前記シールキャップ７５は、上方が閉塞し下方が開口した円形キャップ状をなしており、その上壁が、前記第２弁座６５ａに接離して、同第２弁座６５ａを開閉する（第２開口６５を開閉する）。更にシールキャップ７５の周壁には、複数の通口７６が形成されており、各通口７６の下方側周縁部には、フック７６ａが突設されている。そして、シールキャップ７５を頭部７２の外周に被せることで、シールキャップ７５の上壁裏面側が支持部７２ｂの頂部に支持されて、頭部７２に対してシールキャップ７５が揺動可能に装着されるようになっている。なお、頭部７２の係止部７２ａが、シールキャップ７５のフック７６ａに係止可能とされているため、フロート本体７１に対してシールキャップ７５が抜け止めされている。 Further, the seal cap 75 has a circular cap shape with the upper part closed and the lower part open, and the upper wall thereof is brought into contact with and separated from the second valve seat 65a to open and close the second valve seat 65a ( The second opening 65 is opened and closed). Further, a plurality of through holes 76 are formed on the peripheral wall of the seal cap 75, and hooks 76a are projected from the lower peripheral edge of each through port 76. Then, by covering the outer periphery of the head 72 with the seal cap 75, the back surface side of the upper wall of the seal cap 75 is supported by the top of the support portion 72b, and the seal cap 75 is swingably attached to the head 72. It has become so. Since the locking portion 72a of the head 72 can be locked to the hook 76a of the seal cap 75, the seal cap 75 is prevented from coming off from the float main body 71.
なお、上記のようなシールキャップ７５はなくともよく、例えば、フロート本体７１の上面によって、第２弁座６５ａを直接開閉させてもよい。 The seal cap 75 as described above may not be provided, and for example, the second valve seat 65a may be directly opened and closed by the upper surface of the float body 71.
更に、第２フロート弁７０の下部には延出片７７が設けられており、該延出片７７に前記環状部材８０が抜け止め状態で配置されるようになっている。図５に示すように、この実施形態では、フロート本体７１の軸方向の下端面７１ｂであって、前記肉抜き凹部７３の周縁部から、互いに平行となるように一対の延出片７７，７７が所定長さで延設されている。そして、これらの一対の延出片７７，７７が、ロアー部材４１の収容部４７の一対の下端開口５１，５１の下面側から突出するようになっている（図６参照）。なお、延出片７７は１個でも３個以上であってもよく、前記ロアー部材４１の下端開口５１の個数に応じて設けることができる。 Further, an extension piece 77 is provided at the lower part of the second float valve 70, and the annular member 80 is arranged on the extension piece 77 in a retaining state. As shown in FIG. 5, in this embodiment, the lower end surface 71b in the axial direction of the float main body 71, and a pair of extension pieces 77, 77 so as to be parallel to each other from the peripheral edge portion of the lightening recess 73. Is extended with a predetermined length. The pair of extending pieces 77, 77 project from the lower surface side of the pair of lower end openings 51, 51 of the accommodating portion 47 of the lower member 41 (see FIG. 6). The extension piece 77 may be one or three or more, and may be provided according to the number of lower end openings 51 of the lower member 41.
図５に示すように、各延出片７７の延出方向先端側の外面側からは、基端側に向けて斜め外方に延出する、片側碇足状をなした爪部７８が設けられている。また、各延出片７７の外面側であって、前記爪部７８から所定長さ離れた位置には、抜け止め突部７９が突設されており、該抜け止め突部７９の、延出片先端側に隣接した位置には、板状の挿入リブ７９ａが設けられている。 As shown in FIG. 5, from the outer surface side of each extension piece 77 on the extension direction tip side, a claw portion 78 having a unilateral anchor shape extending diagonally outward toward the base end side is provided. Has been done. Further, on the outer surface side of each extension piece 77, a retaining protrusion 79 is projected at a position separated from the claw portion 78 by a predetermined length, and the retaining protrusion 79 extends. A plate-shaped insertion rib 79a is provided at a position adjacent to one tip side.
そして、ロアー部材４１の収容部４７の上方開口から第２フロート弁７０を挿入し、収容部４７の下端開口５１の下面側から、一対の延出片７７，７７を突出させた後、これらの一対の延出片７７，７７を環状部材８０の内周に挿入する。それによって、挿入リブ７９ａが環状部材８０の内周に挿入されると共に、爪部７８の先端が環状部材８０の係止面８２に係止され、更に抜け止め突部７９が環状部材８０の段部８１の上方に配置されて、一対の延出片７７，７７の先端側外周に、環状部材８０が抜け止め状態で装着される（図６参照）。また、一対の延出片７７，７７の先端側に環状部材８０を配置したことで、ロアー部材４１に対して第２フロート弁７０が抜け止め状態で装着される（図６参照）。 Then, the second float valve 70 is inserted from the upper opening of the accommodating portion 47 of the lower member 41, and a pair of extending pieces 77, 77 are projected from the lower surface side of the lower end opening 51 of the accommodating portion 47, and then these A pair of extension pieces 77, 77 are inserted into the inner circumference of the annular member 80. As a result, the insertion rib 79a is inserted into the inner circumference of the annular member 80, the tip of the claw portion 78 is locked to the locking surface 82 of the annular member 80, and the retaining protrusion 79 is further attached to the step of the annular member 80. The annular member 80 is arranged above the portion 81 and is mounted on the outer periphery of the pair of extension pieces 77, 77 on the tip end side in a retaining state (see FIG. 6). Further, by arranging the annular member 80 on the tip side of the pair of extension pieces 77, 77, the second float valve 70 is attached to the lower member 41 in a retaining state (see FIG. 6).
更に図９〜１１に示すように、アッパー部材６０に対してロアー部材４１が下降するときに、環状部材８０の傾斜面８３の高所８３ａが、ロアー部材４１の収容部４７の押圧部５３に当接して、該押圧部５３によって押圧されるので、ロアー部材４１の自重による押圧力Ｇが、環状部材８０を介して第２フロート弁７０に付与されるようになっている。すなわち、この実施形態においては、環状部材８０が本発明における「受け部」をなしている。 Further, as shown in FIGS. 9 to 11, when the lower member 41 descends with respect to the upper member 60, the height 83a of the inclined surface 83 of the annular member 80 becomes the pressing portion 53 of the accommodating portion 47 of the lower member 41. Since they are in contact with each other and pressed by the pressing portion 53, the pressing force G due to the weight of the lower member 41 is applied to the second float valve 70 via the annular member 80. That is, in this embodiment, the annular member 80 forms the "receiving portion" in the present invention.
ただし、環状部材を配置しなくとも、例えば、延出片７７の、ロアー部材４１の収容部４７の下端開口５１から突出する部分に、受け部を設けて、収容部４７の下端開口５１の周縁の押圧部に当接させてもよく、特に限定はされない。また、前記環状部材８０を配置せずに、延出片７７の爪部７８を、本発明における「受け部」として利用することもできる。 However, even if the annular member is not arranged, for example, a receiving portion is provided at a portion of the extension piece 77 that protrudes from the lower end opening 51 of the accommodating portion 47 of the lower member 41, and the peripheral edge of the lower end opening 51 of the accommodating portion 47 is provided. It may be brought into contact with the pressing portion of the above, and is not particularly limited. Further, the claw portion 78 of the extension piece 77 can be used as the “receiving portion” in the present invention without arranging the annular member 80.
そして、以上のような構造をなした弁装置１０は、第１フロート弁４０のロアー部材４１及びアッパー部材６０が最大限に上昇して、第１弁座２３ａが第１フロート弁４０によって閉じられ（図７参照）、この状態で、第２フロート弁７０はロアー部材４１に対して更に上昇して、第２弁座６５ａを閉じるように構成されている（図８参照）。 In the valve device 10 having the above structure, the lower member 41 and the upper member 60 of the first float valve 40 are raised to the maximum, and the first valve seat 23a is closed by the first float valve 40. (See FIG. 7) In this state, the second float valve 70 is configured to further rise with respect to the lower member 41 and close the second valve seat 65a (see FIG. 8).
すなわち、図６に示すように、燃料タンク内の燃料液面が上昇せず、第１フロート弁４０のロアー部材４１及び第２フロート弁７０のフロート本体７１が燃料に浸漬していない状態では、第１フロート弁４０及び第２フロート弁７０が共に下降して、第１弁座２３ａが開くと共に、アッパー部材６０の第２弁座６５ａが開いた状態となっている。そして、上記状態から車両旋回時や燃料揺動時、更には燃料の満タン給油等によって、第１フロート弁４０のロアー部材４１及び第２フロート弁７０に燃料が浸漬すると、ロアー部材４１に浮力が生じて上昇し、ロアー部材４１の筒状部４４の突出部４４ｂを介して、アッパー部材６０が押し上げられて上昇して、そのシール部６８が第１弁座２３ａに当接して同第１弁座２３ａを閉じる（図７参照）。この状態で、ロアー部材４１の収容部４７に昇降可能に収容された、第２フロート弁７０のフロート本体７１が、ロアー部材４１に対して更に上昇して、第２フロート弁７０のシールキャップ７５が第２弁座６５ａに当接して、同第２弁座６５ａを閉じるように構成されている（図８参照）。 That is, as shown in FIG. 6, in a state where the fuel liquid level in the fuel tank does not rise and the lower member 41 of the first float valve 40 and the float body 71 of the second float valve 70 are not immersed in the fuel. Both the first float valve 40 and the second float valve 70 are lowered to open the first valve seat 23a and the second valve seat 65a of the upper member 60. Then, when the fuel is immersed in the lower member 41 and the second float valve 70 of the first float valve 40 due to the vehicle turning, the fuel swinging, the full tank refueling, or the like from the above state, the lower member 41 has buoyancy. The upper member 60 is pushed up and rises through the protruding portion 44b of the tubular portion 44 of the lower member 41, and the seal portion 68 abuts on the first valve seat 23a and rises. The valve seat 23a is closed (see FIG. 7). In this state, the float body 71 of the second float valve 70, which is housed in the accommodating portion 47 of the lower member 41 so as to be able to move up and down, further rises with respect to the lower member 41, and the seal cap 75 of the second float valve 70 Is configured to come into contact with the second valve seat 65a and close the second valve seat 65a (see FIG. 8).
更にこの弁装置１０は、図８に示すように、第１フロート弁４０のロアー部材４１、アッパー部材６０、及び、第２フロート弁７０がいずれも最大限に上昇して、第１弁座２３ａが第１フロート弁４０によって閉じられ、かつ、第２弁座６５ａが第２フロート弁７０で閉じられた状態で、アッパー部材６０に対してロアー部材４１が独自に下降可能な距離Ａよりも、第２フロート弁７０に対してロアー部材４１が独自に下降可能な距離Ｂの方が短く設定されている。 Further, in this valve device 10, as shown in FIG. 8, the lower member 41, the upper member 60, and the second float valve 70 of the first float valve 40 are all raised to the maximum, and the first valve seat 23a Is closed by the first float valve 40, and the second valve seat 65a is closed by the second float valve 70, so that the lower member 41 can independently descend with respect to the upper member 60. The distance B at which the lower member 41 can independently descend with respect to the second float valve 70 is set shorter.
この実施形態では、図８に示すように、第１弁座２３ａ及び第２弁座６５ａが第１フロート弁４０及び第２フロート弁７０で閉じられた状態で、アッパー部材６０のフック６３ｂと、ロアー部材４１の係止部４４ａとの距離がＡ、第２フロート弁７０の延出片７７に装着された環状部材８０の高所８３ａと、ロアー部材４１の押圧部５３との距離がＢであり、前記Ａよりも前記Ｂが短く設定されている。 In this embodiment, as shown in FIG. 8, with the first valve seat 23a and the second valve seat 65a closed by the first float valve 40 and the second float valve 70, the hook 63b of the upper member 60 and the hook 63b The distance of the lower member 41 from the locking portion 44a is A, and the distance between the height 83a of the annular member 80 mounted on the extension piece 77 of the second float valve 70 and the pressing portion 53 of the lower member 41 is B. Yes, the B is set shorter than the A.
上記のように構成されていることによって、第１弁座２３ａが第１フロート弁４０によって閉じられ、かつ、第２弁座６５ａが第２フロート弁７０で閉じられた状態で（図８参照）、燃料液面が下がって、アッパー部材６０のシール部６８が第１弁座２３ａに貼り付いて、アッパー部材６０が上方に位置した状態のまま、同アッパー部材６０に対してロアー部材４１が下降していき、該ロアー部材４１の押圧部５３が、第２フロート弁７０の受け部（ここでは環状部材８０）に当接して押圧するので、第２フロート弁７０には、その自重に加えて、前記受け部を介して、ロアー部材４１の自重による押圧力Ｇが作用して、第２フロート弁７０が下降する（図９及び図１０参照）。 With the configuration as described above, the first valve seat 23a is closed by the first float valve 40, and the second valve seat 65a is closed by the second float valve 70 (see FIG. 8). The fuel liquid level is lowered, the seal portion 68 of the upper member 60 is attached to the first valve seat 23a, and the lower member 41 is lowered with respect to the upper member 60 while the upper member 60 is positioned upward. Then, the pressing portion 53 of the lower member 41 abuts on the receiving portion (here, the annular member 80) of the second float valve 70 and presses the second float valve 70 in addition to its own weight. The pressing force G due to the weight of the lower member 41 acts on the receiving portion, and the second float valve 70 descends (see FIGS. 9 and 10).
すると、図１１に示すように、第２フロート弁７０のシールキャップ７５が、第２弁座６５ａから離れるので、第１フロート弁４０のシール部６８が第１弁座２３ａを開くよりも先に、第２フロート弁７０が第２弁座６５ａを開く。その後、ロアー部材４１の係止部４４ａがアッパー部材６０のフック６３ｂに当接することで、図１２に示すように、ロアー部材４１の下降による押圧力Ｇがアッパー部材６０に付与される。また、この実施形態においては、図１２に示すように、第２フロート弁７０の下端面７１ｂが、ロアー部材４１の収容部４７の下側壁部４８に当接することで、ロアー部材４１には、第２フロート弁７０の自重も付与されるようになっている。その結果、アッパー部材６０のシール部６８が、第１弁座２３ａからスムーズに離れて、第１弁座２３ａを開くようになっている（図６参照）。 Then, as shown in FIG. 11, since the seal cap 75 of the second float valve 70 is separated from the second valve seat 65a, the seal portion 68 of the first float valve 40 is before the first valve seat 23a is opened. , The second float valve 70 opens the second valve seat 65a. After that, when the locking portion 44a of the lower member 41 comes into contact with the hook 63b of the upper member 60, a pressing force G due to the lowering of the lower member 41 is applied to the upper member 60, as shown in FIG. Further, in this embodiment, as shown in FIG. 12, the lower end surface 71b of the second float valve 70 comes into contact with the lower side wall portion 48 of the accommodating portion 47 of the lower member 41, so that the lower member 41 is exposed to the lower side wall portion 48. The weight of the second float valve 70 is also given. As a result, the seal portion 68 of the upper member 60 is smoothly separated from the first valve seat 23a to open the first valve seat 23a (see FIG. 6).
また、この実施形態の弁装置１０においては、受け部をなす環状部材８０と、押圧部５３とは、第２フロート弁７０に対して偏心した位置に設けられており、第２フロート弁７０が押し下げられるとき、ハウジング１５の軸心Ｃ１（図１０参照）に対して傾くような力を付与するように構成されている。 Further, in the valve device 10 of this embodiment, the annular member 80 forming the receiving portion and the pressing portion 53 are provided at positions eccentric with respect to the second float valve 70, and the second float valve 70 is provided. When pushed down, it is configured to apply a tilting force to the axial center C1 (see FIG. 10) of the housing 15.
すなわち、第２フロート弁７０の下降時において、環状部材８０の、押圧部５３に当接する部分は、傾斜面８３のうち、他の箇所よりも高い高所８３ａであり、この高所８３ａは、第２フロート弁７０の軸心Ｃ２（図１０参照）に対して偏心した位置となっている。また、この高所８３ａを押圧する押圧部５３をなす、ロアー部材４１の収容部４７の下端開口５１の下面側周縁も、第２フロート弁７０の軸心Ｃ２に対して偏心した位置となっている。 That is, when the second float valve 70 is lowered, the portion of the annular member 80 that comes into contact with the pressing portion 53 is a high place 83a that is higher than the other parts of the inclined surface 83, and this high place 83a is The position is eccentric with respect to the axial center C2 (see FIG. 10) of the second float valve 70. Further, the lower edge of the lower end opening 51 of the accommodating portion 47 of the lower member 41, which forms the pressing portion 53 for pressing the high place 83a, is also located at an eccentric position with respect to the axial center C2 of the second float valve 70. There is.
上記のように構成したことによって、図８に示すような、第１弁座２３ａが第１フロート弁４０で閉じられ、かつ、第２弁座６５ａが第２フロート弁７０で閉じられた状態で、アッパー部材６０に対してロアー部材４１が下降すると、環状部材８０の高所８３ａに押圧部５３が当接して、環状部材８０の中で周方向に偏った押圧力Ｇが付与される。その結果、図１０に示すように、環状部材８０の高所８３ａを支点として、延出片７７を介して第２フロート弁７０に回転モーメントＭが作用するので、第２フロート弁７０の軸心Ｃ２をハウジング１５の軸心Ｃ１に対して傾いた状態として、第２フロート弁７０の係止部７２ａの、環状部材８０の高所８３ａとは周方向反対側に位置する部分が、シールキャップ７５のフック７６ａに片当たりするようになっている。 With the above configuration, as shown in FIG. 8, the first valve seat 23a is closed by the first float valve 40, and the second valve seat 65a is closed by the second float valve 70. When the lower member 41 descends with respect to the upper member 60, the pressing portion 53 abuts on the high place 83a of the annular member 80, and a pressing force G biased in the circumferential direction is applied in the annular member 80. As a result, as shown in FIG. 10, the rotational moment M acts on the second float valve 70 via the extension piece 77 with the high point 83a of the annular member 80 as a fulcrum, and thus the axial center of the second float valve 70. With C2 tilted with respect to the axial center C1 of the housing 15, the portion of the locking portion 72a of the second float valve 70 located on the side opposite to the height 83a of the annular member 80 in the circumferential direction is the seal cap 75. It is designed to hit the hook 76a of.
次に、上記構成からなる本発明の弁装置１０の作用効果について説明する。 Next, the operation and effect of the valve device 10 of the present invention having the above configuration will be described.
この実施形態においては、第２フロート弁７０の下部に延出片７７を設けたことにより、次のような作用効果を奏するようになっている。 In this embodiment, by providing the extension piece 77 at the lower part of the second float valve 70, the following effects are exhibited.
すなわち、この実施形態においては、第２フロート弁７０の下部に、ロアー部材４１の収容部４７の下端開口５１から突出する延出片７７が設けられ、この延出片７７の外周に環状部材８０が配置されて抜け止めされており、この環状部材８０が、収容部４７の下端開口５１の周縁に当接する受け部をなし、収容部４７の下端開口５１の下面側周縁が押圧部５３をなしている。 That is, in this embodiment, an extension piece 77 projecting from the lower end opening 51 of the accommodating portion 47 of the lower member 41 is provided below the second float valve 70, and the annular member 80 is provided on the outer periphery of the extension piece 77. The annular member 80 serves as a receiving portion that abuts on the peripheral edge of the lower end opening 51 of the accommodating portion 47, and the lower peripheral side peripheral edge of the lower end opening 51 of the accommodating portion 47 forms the pressing portion 53. ing.
これによれば、第２フロート弁７０をロアー部材４１の収容部４７に、その上方開口から収容して、収容部４７の下端開口５１から、第２フロート弁７０の延出片７７を突出させて、その突出部分の外周に環状部材８０を配置して抜け止めすることで、第１フロート弁４０に対して第２フロート弁７０を昇降可能に装着することができる。また、延出片７７の外周に環状部材８０が配置されていることで、延出片７７の変形を防止することができる。 According to this, the second float valve 70 is accommodated in the accommodating portion 47 of the lower member 41 from the upper opening thereof, and the extension piece 77 of the second float valve 70 is projected from the lower end opening 51 of the accommodating portion 47. By arranging the annular member 80 on the outer periphery of the protruding portion to prevent it from coming off, the second float valve 70 can be mounted on the first float valve 40 so as to be able to move up and down. Further, since the annular member 80 is arranged on the outer periphery of the extension piece 77, the deformation of the extension piece 77 can be prevented.
また、環状部材８０を配置せずに、第２フロート弁７０の下部の延出片７７に、直接的に、ロアー部材４１の収容部４７の下端開口５１の周縁に当接する、本発明における「受け部」を設けた場合には、第２フロート弁７０をロアー部材４１の収容部４７に、その上方開口から収容して、収容部４７の下端開口５１から、第２フロート弁７０の延出片７７を突出させて、その受け部を、ロアー部材４１の下端開口５１の下面周縁に設けた押圧部５３に当接させるだけの簡単な作業で、第１フロート弁４０に第２フロート弁７０を昇降可能に装着することができ、第１フロート弁４０に対する第２フロート弁７０の装着作業性を向上させることができる。 Further, in the present invention, the annular member 80 is not arranged, and the extension piece 77 at the lower part of the second float valve 70 is directly in contact with the peripheral edge of the lower end opening 51 of the accommodating portion 47 of the lower member 41. When the receiving portion is provided, the second float valve 70 is accommodated in the accommodating portion 47 of the lower member 41 from the upper opening thereof, and the second float valve 70 extends from the lower end opening 51 of the accommodating portion 47. The second float valve 70 is attached to the first float valve 40 by a simple operation of projecting the piece 77 and bringing the receiving portion into contact with the pressing portion 53 provided on the lower peripheral edge of the lower end opening 51 of the lower member 41. Can be mounted so as to be able to move up and down, and the workability of mounting the second float valve 70 with respect to the first float valve 40 can be improved.
そして、図６に示すように、第１フロート弁４０のロアー部材４１及びアッパー部材６０、更に第２フロート弁７０が下降して、第１弁座２３ａ及び第２弁座６５ａが開いた状態から、燃料タンク内に燃料が給油されて、燃料タンク内の燃料液面が上昇すると、図７に示すように、第１フロート弁４０のロアー部材４１に浮力が生じて上昇すると共に、それに伴ってアッパー部材６０も上昇して、同アッパー部材６０に配置されたシール部６８が第１弁座２３ａに当接して同第１弁座２３ａを閉じるので、燃料タンク内の空気や燃料蒸気の排出量が低下して、それ以上の燃料給油を防止することができる。 Then, as shown in FIG. 6, the lower member 41 and the upper member 60 of the first float valve 40, and the second float valve 70 are lowered, and the first valve seat 23a and the second valve seat 65a are opened. When the fuel is refueled in the fuel tank and the fuel liquid level in the fuel tank rises, as shown in FIG. 7, the lower member 41 of the first float valve 40 is buoyant and rises, and accordingly. The upper member 60 also rises, and the seal portion 68 arranged on the upper member 60 abuts on the first valve seat 23a to close the first valve seat 23a, so that the amount of air and fuel vapor discharged from the fuel tank is discharged. Can be reduced to prevent further fuel refueling.
また、図６に示される第１弁座２３ａ及び第２弁座６５ａが開いた状態から、車両旋回時や燃料揺動、更に燃料の満タン給油時等において、第１フロート弁４０のロアー部材４１のみならず、第２フロート弁７０にも燃料が浸漬した場合には、第１フロート弁４０が上昇して第１弁座２３ａを閉じると共に、第２フロート弁７０がロアー部材４１に対して更に上昇して、第２フロート弁７０のシールキャップ７５が第２弁座６５ａに当接して、第２弁座６５ａを閉じる（図８参照）。このように、第１弁座２３ａのみならず第２弁座６５ａも閉じるので、燃料が通気室Ｒ２側に漏れることを抑制することができ、燃料タンク外への燃料漏れを抑制することができる。 Further, from the state where the first valve seat 23a and the second valve seat 65a shown in FIG. 6 are open, the lower member of the first float valve 40 is used when the vehicle turns, the fuel swings, and when the fuel is fully refueled. When fuel is immersed not only in 41 but also in the second float valve 70, the first float valve 40 rises to close the first valve seat 23a, and the second float valve 70 with respect to the lower member 41. Further rising, the seal cap 75 of the second float valve 70 comes into contact with the second valve seat 65a and closes the second valve seat 65a (see FIG. 8). Since not only the first valve seat 23a but also the second valve seat 65a is closed in this way, it is possible to suppress fuel leakage to the ventilation chamber R2 side, and it is possible to suppress fuel leakage to the outside of the fuel tank. ..
そして、この弁装置１０においては、第１フロート弁４０をアッパー部材６０とロアー部材４１とで構成し、アッパー部材６０に対してロアー部材４１を所定距離だけ昇降可能とすると共に、図８に示される、第１弁座２３ａが第１フロート弁４０によって閉じられ、かつ、第２弁座６５ａが第２フロート弁７０で閉じられた状態で、アッパー部材６０に対してロアー部材４１が独自に下降可能な距離Ａよりも、第２フロート弁７０に対してロアー部材４１が独自に下降可能な距離Ｂの方が短く設定されているため、上記状態から、燃料液面が下がると、アッパー部材６０が第１弁座２３ａに貼り付いたままでも、同アッパー部材６０に対してロアー部材４１が下降して、その押圧部５３が、第２フロート弁７０の環状部材８０の高所８３ａに当接して押圧することとなる。その結果、第２フロート弁７０には、その自重以外にも、環状部材８０を介して、ロアー部材４１の自重による押圧力Ｇが加わることになるので、第２フロート弁７０を下降しやすくさせて、第２弁座２３ａを確実に開くことができる（図１１参照）。 In this valve device 10, the first float valve 40 is composed of an upper member 60 and a lower member 41 so that the lower member 41 can be raised and lowered by a predetermined distance with respect to the upper member 60, and is shown in FIG. The lower member 41 independently lowers with respect to the upper member 60 in a state where the first valve seat 23a is closed by the first float valve 40 and the second valve seat 65a is closed by the second float valve 70. Since the distance B at which the lower member 41 can independently descend with respect to the second float valve 70 is set shorter than the possible distance A, when the fuel liquid level drops from the above state, the upper member 60 Is still attached to the first valve seat 23a, the lower member 41 descends with respect to the upper member 60, and the pressing portion 53 abuts on the high point 83a of the annular member 80 of the second float valve 70. Will be pressed. As a result, in addition to its own weight, the pressing force G due to the own weight of the lower member 41 is applied to the second float valve 70 via the annular member 80, so that the second float valve 70 can be easily lowered. Therefore, the second valve seat 23a can be reliably opened (see FIG. 11).
このとき、この実施形態においては、受け部をなす環状部材８０と、押圧部５３とは、第２フロート弁７０に対して偏心した位置に設けられており、第２フロート弁７０が押し下げられるとき、ハウジング１５の軸心Ｃ１に対して傾くような力を付与するように構成されている（図１０及び図１１参照）。 At this time, in this embodiment, the annular member 80 forming the receiving portion and the pressing portion 53 are provided at positions eccentric with respect to the second float valve 70, and when the second float valve 70 is pushed down. , Is configured to apply a tilting force to the axial center C1 of the housing 15 (see FIGS. 10 and 11).
そのため、図８に示される第１弁座２３ａ及び第２弁座６５ａが閉じられた状態で、アッパー部材６０に対してロアー部材４１が下降すると、環状部材８０の高所８３ａに押圧部５３が当接して、環状部材８０の中で周方向に偏った押圧力Ｇが付与されるので、図１０に示すように、第２フロート弁７０の軸心Ｃ２をハウジング１５の軸心Ｃ１に対して傾いた状態にすることができるので、第２フロート弁７０のシールキャップ７５を第２弁座６５ａから離しやすくして、第２弁座６５ａをより開きやすくすることができ、第２フロート弁７０の再開弁圧を高めることができる（より再開弁させやすくすることができる）。 Therefore, when the lower member 41 descends with respect to the upper member 60 with the first valve seat 23a and the second valve seat 65a shown in FIG. 8 closed, the pressing portion 53 is pressed at a high place 83a of the annular member 80. Since the pressing force G biased in the circumferential direction is applied in the annular member 80 by abutting against each other, the axial center C2 of the second float valve 70 is applied to the axial center C1 of the housing 15 as shown in FIG. Since it can be tilted, the seal cap 75 of the second float valve 70 can be easily separated from the second valve seat 65a, the second valve seat 65a can be opened more easily, and the second float valve 70 can be opened easily. The restart valve pressure can be increased (it can be made easier to restart the valve).
上記のように、図１１に示すように、第２フロート弁７０のシールキャップ７５が、第２弁座６５ａから離れて、第１フロート弁４０のシール部６８が第１弁座２３ａを開くよりも先に、第２フロート弁７０のシールキャップ７５が第２弁座６５ａを開いた後は、図１２に示すように、ロアー部材４１の下降による押圧力Ｇがアッパー部材６０に付与されると共に、第２フロート弁７０の下端面７１ｂが、ロアー部材４１の収容部４７の下側壁部４８に当接して、ロアー部材４１に、第２フロート弁７０の自重も付与されるので、アッパー部材６０に配置されたシール部６８が、第１弁座２３ａからスムーズに離れて、再び第１弁座２３ａを開くことができる（図６参照）。また、既に第２フロート弁７０が第２弁座６５ａから離れて第２弁座６５ａが開いているので、第２弁座６５ａを設けた第２開口６５から、通気室Ｒ２内の空気や燃料蒸気が燃料タンク内に流入することになり、アッパー部材６０に配置されたシール部６８を、第１弁座２３ａから離して、同第１弁座２３ａを速やかに開かせることができ、燃料の高さ変動に対する応答性を高めることができる。 As described above, as shown in FIG. 11, the seal cap 75 of the second float valve 70 is separated from the second valve seat 65a, and the seal portion 68 of the first float valve 40 opens the first valve seat 23a. First, after the seal cap 75 of the second float valve 70 opens the second valve seat 65a, as shown in FIG. 12, the pressing force G due to the lowering of the lower member 41 is applied to the upper member 60. The lower end surface 71b of the second float valve 70 comes into contact with the lower side wall portion 48 of the accommodating portion 47 of the lower member 41, and the lower member 41 is also given the weight of the second float valve 70. Therefore, the upper member 60 The seal portion 68 arranged in the first valve seat 23a can be smoothly separated from the first valve seat 23a and the first valve seat 23a can be opened again (see FIG. 6). Further, since the second float valve 70 is already separated from the second valve seat 65a and the second valve seat 65a is open, the air and fuel in the ventilation chamber R2 are opened from the second opening 65 provided with the second valve seat 65a. The steam will flow into the fuel tank, and the seal portion 68 arranged on the upper member 60 can be separated from the first valve seat 23a so that the first valve seat 23a can be quickly opened. The responsiveness to height fluctuations can be improved.
また、この実施形態においては、第２開口６５の開口面積は、前記第１開口２３の開口面積よりも小さく形成されている。そのため、タンク内圧の受圧面積が小さい、第２開口６５側の第２フロート弁７０が、タンク内圧の受圧面積が大きい、第１開口２３側の第１フロート弁４０よりも、下降しやすい傾向となる。したがって、図８に示される、第１弁座２３ａが第１フロート弁４０によって閉じられ、かつ、第２弁座６５ａが第２フロート弁７０で閉じられた状態から、燃料液面が下がると、第１フロート弁４０のロアー部材４１が第２フロート弁７０よりも先に下降するので、その押圧部５３が第２フロート弁７０を確実に押圧して、第２弁座６５ａから第２フロート弁７０をより確実に開きやすくすることができ、また、第２フロート弁７０が第２弁座６５ａから開けば、通気室Ｒ２内の空気や燃料蒸気の流入によって、第１フロート弁４０も開きやすくすることができる。 Further, in this embodiment, the opening area of the second opening 65 is formed to be smaller than the opening area of the first opening 23. Therefore, the second float valve 70 on the second opening 65 side, which has a small tank internal pressure receiving area, tends to descend more easily than the first float valve 40 on the first opening 23 side, which has a large tank internal pressure receiving area. Become. Therefore, when the fuel liquid level drops from the state where the first valve seat 23a shown in FIG. 8 is closed by the first float valve 40 and the second valve seat 65a is closed by the second float valve 70, Since the lower member 41 of the first float valve 40 descends before the second float valve 70, the pressing portion 53 reliably presses the second float valve 70, and the second valve seat 65a to the second float valve The 70 can be opened more reliably, and if the second float valve 70 is opened from the second valve seat 65a, the first float valve 40 can also be easily opened due to the inflow of air or fuel vapor in the ventilation chamber R2. can do.
更に、この実施形態においては、受け部（ここでは環状部材８０）は、第２フロート弁７０の下部に設けられている。そのため、アッパー部材６０に対してロアー部材４１が下降するときに、その押圧部５３が、第２フロート弁７０の下部に設けられた受け部を迅速に押圧するので、第２フロート弁７０をスムーズに下降させることができる。 Further, in this embodiment, the receiving portion (here, the annular member 80) is provided in the lower part of the second float valve 70. Therefore, when the lower member 41 descends with respect to the upper member 60, the pressing portion 53 quickly presses the receiving portion provided at the lower part of the second float valve 70, so that the second float valve 70 can be smoothly pressed. Can be lowered to.
また、本発明は、上述した実施形態に限定されるものではなく、本発明の要旨の範囲内で、各種の変形実施形態が可能であり、そのような実施形態も本発明の範囲に含まれる。 Further, the present invention is not limited to the above-described embodiments, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included in the scope of the present invention. ..
１０ 燃料タンク用弁装置（弁装置）
１５ ハウジング
２１ 仕切壁
２３ 第１開口
３０ カバー部材
３４ 燃料蒸気排出口
３７ キャップ
４０ 第１フロート弁
４１ ロアー部材
４３ フロート本体
５１ 下端開口
５３ 押圧部
６０ アッパー部材
６５ 第２開口
６８ シール部
７０ フロート弁
７１ フロート本体
７５ シールキャップ
７７ 延出片
８０ 環状部材
10 Fuel tank valve device (valve device)
15 Housing 21 Partition wall 23 First opening 30 Cover member 34 Fuel steam discharge port 37 Cap 40 First float valve 41 Lower member 43 Float body 51 Lower end opening 53 Pressing part 60 Upper member 65 Second opening 68 Sealing part 70 Float valve 71 Float body 75 Seal cap 77 Extension piece 80 Ring member
Claims (6)
前記弁室に昇降可能に収容され、前記第１弁座を開閉し、かつ、内部に収容部が形成さ
れると共に、該収容部と前記通気室を連通させる第２開口が設けられ、該第２開口の周縁
に第２弁座が形成された第１フロート弁と、
前記第１フロート弁の収容部内に昇降可能に配置され、前記第２弁座を開閉する第２フ
ロート弁とを備え、
前記第１フロート弁は、アッパー部材と、該アッパー部材に対して所定距離だけ昇降可
能に装着されたロアー部材とを有し、
前記ロアー部材は、フロート本体を有し、該フロート本体の内部に、前記第２フロート弁を所定距離だけ昇降可能に収容する前記収容部が形成され、前記ロアー部材の下降時に前記第２フロート弁を押圧する押圧部が設けられており、
前記アッパー部材は、前記第１弁座に当接するシール部と、前記第２開口とを有し、
前記第２フロート弁は、前記ロアー部材が下降するとき、前記ロアー部材の前記押圧部に当接する受け部を有しており、
前記第１フロート弁のロアー部材及びアッパー部材が最大限に上昇して前記第１弁座が前記第１フロート弁によって閉じられ、前記第２フロート弁は前記ロアー部材に対して更に上昇して前記第２弁座を閉じるように構成されており、
前記第１フロート弁のロアー部材、アッパー部材及び前記第２フロート弁がいずれも最大限に上昇して、前記第１弁座が前記第１フロート弁によって閉じられ、かつ、前記第２弁座が前記第２フロート弁で閉じられた状態で、前記アッパー部材に対して前記ロアー部材が独自に下降可能な距離よりも、前記第２フロート弁に対して前記ロアー部材が独自に下降可能な距離の方が短く設定されていることを特徴とする燃料タンク用弁装置。 A valve chamber communicating with the fuel tank is provided below and a ventilation chamber communicating with the fuel vapor discharge port is provided above through the partition wall, and the partition wall is provided with a first opening for communicating the valve chamber and the ventilation chamber. A housing in which a first valve seat is formed on the periphery of the first opening.
It is housed in the valve chamber so as to be able to move up and down, the first valve seat is opened and closed, and a housing portion is formed inside, and a second opening for communicating the housing portion and the ventilation chamber is provided. A first float valve with a second valve seat formed on the periphery of the two openings,
It is provided with a second float valve that is arranged so as to be able to move up and down in the accommodating portion of the first float valve and that opens and closes the second valve seat.
The first float valve has an upper member and a lower member mounted so as to be able to move up and down by a predetermined distance with respect to the upper member.
The lower member has a float body, and the accommodating portion for accommodating the second float valve so as to be able to move up and down by a predetermined distance is formed inside the float body, and the second float valve is formed when the lower member is lowered. There is a pressing part to press
The upper member has a seal portion that abuts on the first valve seat and the second opening.
The second float valve has a receiving portion that comes into contact with the pressing portion of the lower member when the lower member is lowered.
The lower member and upper member of the first float valve are raised to the maximum, the first valve seat is closed by the first float valve, and the second float valve is further raised with respect to the lower member. It is configured to close the second valve seat,
The lower member, the upper member, and the second float valve of the first float valve are all raised to the maximum, the first valve seat is closed by the first float valve, and the second valve seat is closed. The distance at which the lower member can independently descend with respect to the second float valve is greater than the distance at which the lower member can independently descend with respect to the upper member when closed by the second float valve. A valve device for a fuel tank, which is characterized by being set shorter.
該環状部材が、前記収容部の下端開口周縁に当接する前記受け部をなし、前記収容部の下端開口周縁が前記押圧部をなす、請求項３記載の燃料タンク用弁装置。 An extension piece protruding from the lower end opening of the accommodating portion of the lower member is provided in the lower part of the second float valve, and an annular member is arranged on the outer periphery of the extension piece to prevent it from coming off.
The valve device for a fuel tank according to claim 3, wherein the annular member forms the receiving portion that abuts on the lower end opening peripheral edge of the accommodating portion, and the lower end opening peripheral edge of the accommodating portion forms the pressing portion.
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