JP2006123576A - Fuel check valve - Google Patents

Fuel check valve Download PDF

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JP2006123576A
JP2006123576A JP2004310518A JP2004310518A JP2006123576A JP 2006123576 A JP2006123576 A JP 2006123576A JP 2004310518 A JP2004310518 A JP 2004310518A JP 2004310518 A JP2004310518 A JP 2004310518A JP 2006123576 A JP2006123576 A JP 2006123576A
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fuel
valve
valve body
valve seat
curvature
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JP4660156B2 (en
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Morihiko Kishi
森彦 岸
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Piolax Inc
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Piolax Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel check valve mounted to a fuel tank of an automobile or the like, capable of certainly preventing a reverse flow of a fuel by sufficiently ensuring sealing property even if a seal member made of rubber is not used and realizing reduction of cost by reducing the number of parts and an assembling man-hour. <P>SOLUTION: The fuel check valve 10 is provided with a housing 20 mounted to the fuel tank 1 and having one end connected to a fuel feed pipe 3 and the other end opened into the fuel tank 1; a valve seat 42 provided on a fuel passage of the housing 20; and a valve element 50 press-contacted with the valve seat 42 from a side communicating with the fuel tank 1 by an elastic means 71. A contact surface of the valve seat 42 and the valve element 50 is formed to a spherical surface having the approximately same curvature and the approximately same center of curvature. Therefore, the valve element 50 is abutted on the valve seat 42 at a wide contact area and the sealing property is enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、自動車等の燃料タンクに取付けられ、ゴム製のシール部材を用いずとも、燃料通路をしっかりと閉塞して、燃料タンク内の燃料の逆流を確実に防止する燃料逆流防止バルブに関する。   The present invention relates to a fuel backflow prevention valve which is attached to a fuel tank of an automobile or the like and securely closes a fuel passage without reliably using a rubber seal member to reliably prevent backflow of fuel in the fuel tank.

自動車の燃料タンクには、給油口に連結された燃料供給管が接続されており、この燃料供給管の出口付近には、燃料供給管への逆流を防止する燃料逆流防止バルブが連結されている。この燃料逆流防止バルブは、給油時には、燃料供給管から流入する燃料の圧力で開いて燃料タンク内へ燃料を流入させ、常時は弾性手段によって閉じて、燃料タンク内から燃料供給管へ燃料が逆流するのを防止している。   A fuel supply pipe connected to a fuel supply port is connected to the fuel tank of the automobile, and a fuel backflow prevention valve for preventing a backflow to the fuel supply pipe is connected near the outlet of the fuel supply pipe. . When refueling, this fuel backflow prevention valve opens at the pressure of the fuel flowing in from the fuel supply pipe and allows the fuel to flow into the fuel tank, and is always closed by elastic means, so that the fuel flows back from the fuel tank to the fuel supply pipe. Is prevented.

上記燃料の逆流防止用のバルブとして、下記特許文献１には、バルブケーシングのフィラーパイプ側の部分に、テーパー状の弁座部が形成され、この弁座部に向けて弁体が付勢ばねで付勢されており、この弁体に、弁座部に着座するリップ部を有する弾性材製のシール部材を取付けられたバルブが開示されている。また、その実施形態には、前記シール部材は、本体部材とばね受け部材との間に挟み込まれており、該シール部材は、ＮＢＲ（アクリロニトリルブタジエンゴム）等のゴム製の弾性材料で形成されていることが記載されている。   As a valve for preventing the back flow of the fuel, in Patent Document 1 below, a tapered valve seat portion is formed on the filler pipe side portion of the valve casing, and the valve body is biased toward the valve seat portion. A valve is disclosed in which an elastic seal member having a lip portion seated on the valve seat portion is attached to the valve body. In the embodiment, the seal member is sandwiched between a main body member and a spring receiving member, and the seal member is formed of a rubber elastic material such as NBR (acrylonitrile butadiene rubber). It is described that.

下記特許文献２には、燃料タンクと燃料供給管との連結口部を開閉するスライド式の弁体を備え、この弁体は、前記連結口部の上流側に向かって伸長し、その内壁面に摺接する複数のガイド突起を設けたスライド部材と、上記連結口部の口縁に密着する弾性シール部材と、該弾性シール部材をスライド部材側に押圧する押圧部材とから構成されているバルブが開示されている。また、その実施形態には、前記弾性シール部材は、スライド部材と押圧部材との間にて挟み込まれており、この弾性シール部材は、ゴム等の弾性材料で形成されていることが記載されている。
特開２０００−１６０９９号公報 特開平１１−７８５４９号公報 The following Patent Document 2 includes a slide-type valve body that opens and closes a connection port portion between a fuel tank and a fuel supply pipe, and the valve body extends toward the upstream side of the connection port portion and has an inner wall surface thereof. A valve comprising: a slide member provided with a plurality of guide protrusions that are in sliding contact with each other; an elastic seal member that is in close contact with the rim of the connecting port portion; and a pressing member that presses the elastic seal member toward the slide member. It is disclosed. Further, the embodiment describes that the elastic seal member is sandwiched between a slide member and a pressing member, and the elastic seal member is formed of an elastic material such as rubber. Yes.
Japanese Patent Laid-Open No. 2000-16099 Japanese Patent Application Laid-Open No. 11-78549

上記特許文献１又は２のバルブのいずれも、ゴム製のシール部材によって、バルブケーシングの弁座部、又は連結口部の口縁に当接してシールして燃料の逆流を防止している。しかしながら、ゴム製のシール部材は、シール性を効率的に向上させることができるが、コストが高いという問題がある。また、シール部材は、特許文献１では本体部材とばね受け部材、特許文献２ではスライド部材と押圧部材といったように、２部材により挟み込まれているので部品点数が多く、それに伴い組付け工数も多くなってしまって、結果としてコストが増加してしまうこととなる。更に、燃料のアルコール濃度が高いような場合、ゴム製のシール部材だと、膨潤してシール性が低下したり、耐久性が低下したりしてしまうことがあった。   In either of the above-mentioned valves of Patent Document 1 or 2, a rubber seal member is in contact with and sealed against the valve seat portion of the valve casing or the rim of the connecting port portion to prevent back flow of fuel. However, the rubber seal member can improve the sealing performance efficiently, but has a problem of high cost. Further, since the sealing member is sandwiched between two members, such as a main body member and a spring receiving member in Patent Document 1 and a slide member and a pressing member in Patent Document 2, the number of parts is large, and accordingly, the number of assembling steps is also large. As a result, the cost increases. Furthermore, when the alcohol concentration of the fuel is high, the rubber seal member may swell and deteriorate the sealing performance, or the durability may decrease.

したがって、本発明の目的は、ゴム製のシール部材を用いなくとも、シール性を十分に確保して、燃料の逆流を確実に防止することができるとともに、部品点数及び組付け工数を少なくして、コストの低減を図ることができる燃料逆流防止バルブを提供することにある。   Accordingly, the object of the present invention is to ensure sufficient sealing performance without using a rubber seal member, to reliably prevent fuel backflow, and to reduce the number of parts and assembly man-hours. Another object of the present invention is to provide a fuel backflow prevention valve capable of reducing the cost.

上記目的を達成するため、本発明の第１は、燃料タンクに取付けられて、その一端が燃料供給管に連結され、他端が燃料タンク内に開口されるハウジングと、このハウジングの燃料通路に設けられた弁座と、この弁座に対して燃料タンク内に連通する側から弾性手段により圧接された弁体とを備え、前記弁座と前記弁体との接触面が、ほぼ同一の曲率で、かつ、ほぼ同一の曲率中心をもつ球面をなしていることを特徴とする燃料逆流防止バルブを提供するものである。   In order to achieve the above object, a first aspect of the present invention includes a housing attached to a fuel tank, one end of which is connected to a fuel supply pipe and the other end opened in the fuel tank, and a fuel passage of the housing. And a valve body pressed against the valve seat by elastic means from the side communicating with the valve seat in the fuel tank, and the contact surface between the valve seat and the valve body has substantially the same curvature. In addition, the present invention provides a fuel backflow prevention valve characterized by forming a spherical surface having substantially the same center of curvature.

本発明の第２は、前記第１の発明において、前記弁体は、その周縁が折曲部を介して斜め外方に伸びてスカート状をなし、このシール面が前記曲率及び曲率中心を有する球面をなしている燃料逆流防止バルブを提供するものである。   According to a second aspect of the present invention, in the first aspect of the invention, the valve body has a peripheral edge extending obliquely outward via a bent portion to form a skirt shape, and the sealing surface has the curvature and the center of curvature. A spherical fuel backflow prevention valve is provided.

本発明の第３は、前記第２の発明において、前記折曲部の裏面側が環状にへこんで薄肉部を構成している燃料逆流防止バルブを提供するものである。   According to a third aspect of the present invention, there is provided the fuel backflow prevention valve according to the second aspect, wherein a back surface side of the bent portion is recessed in an annular shape to constitute a thin portion.

本発明の第４は、前記第１〜３の発明のいずれか１つにおいて、前記弁体の裏面中心から放射状に伸びるリブが形成されている燃料逆流防止バルブを提供するものである。   According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, there is provided a fuel backflow prevention valve in which ribs extending radially from the center of the back surface of the valve body are formed.

本発明の第５は、前記第１〜４の発明のいずれか１つにおいて、前記弁体の前記弁座への接触面より内周側に平坦部が形成されている燃料逆流防止バルブを提供するものである。   A fifth aspect of the present invention provides the fuel backflow prevention valve according to any one of the first to fourth aspects of the present invention, wherein a flat portion is formed on an inner peripheral side from a contact surface of the valve body to the valve seat. To do.

本発明の燃料逆流防止バルブによれば、燃料の供給がなされると燃料の圧力によって、弾性手段の付勢力に抗して弁体が開いて、燃料タンク内に燃料が供給され、燃料の供給が終了すると、弁体は弾性手段により弁座と圧接し、通路を閉塞して燃料供給管への逆流を防止し、給油時における燃料の吹き返し等の事故を防止する。   According to the fuel backflow prevention valve of the present invention, when the fuel is supplied, the valve body is opened against the biasing force of the elastic means by the pressure of the fuel, and the fuel is supplied into the fuel tank. When the operation is completed, the valve body is brought into pressure contact with the valve seat by the elastic means, and the passage is closed to prevent the backflow to the fuel supply pipe, thereby preventing an accident such as fuel blowback during refueling.

そして、弁座と弁体との接触面が、ほぼ同一の曲率で、かつ、ほぼ同一の曲率中心をもつ球面をなしているので、弁座と弁体との間に隙間がほとんど生じない状態で、弁座に対して広い接触面積で弁体が当接するようになり、弁座と弁体とのシール性を向上させることができる。   Since the contact surface between the valve seat and the valve body has a spherical surface having substantially the same curvature and substantially the same center of curvature, there is almost no gap between the valve seat and the valve body. Thus, the valve body comes into contact with the valve seat with a wide contact area, and the sealing performance between the valve seat and the valve body can be improved.

また、車両の揺れ等によって、燃料タンクが斜めに傾いたりして、弁体が弁座に対してやや傾いた状態で当接したとしても、弁体と弁座とが球面どうしで接触するため、どのような角度で当たっても両者が密接状態となり、ガタ付きによるシール性の低下も防止することができる。   In addition, even if the fuel tank is tilted obliquely due to vehicle shake or the like, and the valve body comes into contact with the valve seat in a slightly tilted state, the valve body and the valve seat contact each other between the spherical surfaces. Even if it hits at any angle, the two are in close contact with each other, and it is possible to prevent deterioration of the sealing performance due to backlash.

こうして、弁体にゴム製のシール部材を用いなくても、シール性を良好に維持することができるため、部品点数を少なくすることができ、シール部材の組付け作業も不要となるので、コストの低減を図ることができ、燃料のアルコール濃度を気にする必要もなく、信頼性を高めることができる。   In this way, the sealing performance can be maintained satisfactorily without using a rubber seal member for the valve body, so the number of parts can be reduced and the assembly work of the seal member is not required. Therefore, it is not necessary to worry about the alcohol concentration of the fuel, and the reliability can be improved.

以下、図１〜７を参照して、本発明の燃料逆流防止バルブの一実施形態を説明する。   Hereinafter, with reference to FIGS. 1-7, one Embodiment of the fuel backflow prevention valve of this invention is described.

図１に示されるように、この燃料逆流防止バルブ（以下、バルブ１０という）は、燃料タンクに取付けられて、その一端が燃料供給管に連結され、他端が燃料タンク内に開口したハウジング２０を有している。このハウジング２０は、燃料タンク１に固定される蓋体３０と、蓋体３０とインサート成形されて、その内部に弁体５０をスライド可能に収容する弁ケース４０とから構成される。なお、この実施形態の場合、蓋体３０は、樹脂燃料タンクに溶着可能な材質、例えばポリエチレン等のオレフィン系樹脂で形成され、弁ケース４０は、強度が高く、燃料非透過性の材質、例えばポリアセタール（ＰＯＭ）、ポリアミド（ＰＡ）等の樹脂で形成されている。   As shown in FIG. 1, this fuel backflow prevention valve (hereinafter referred to as valve 10) is attached to a fuel tank, one end of which is connected to a fuel supply pipe, and the other end is opened in the fuel tank. have. The housing 20 includes a lid 30 fixed to the fuel tank 1, and a valve case 40 that is insert-molded with the lid 30 and accommodates the valve body 50 in a slidable manner therein. In the case of this embodiment, the lid 30 is formed of a material that can be welded to a resin fuel tank, for example, an olefin resin such as polyethylene, and the valve case 40 has a high strength and a fuel non-permeable material, for example, It is formed of a resin such as polyacetal (POM) or polyamide (PA).

蓋体３０は、燃料タンクの開口部周縁に溶着されるフランジ部３１と、燃料供給管が接続される接続管部３２とを有している。接続管部３２の先端部外周には、燃料供給管をホースバンド等で締め付け固定したときに、外部配管を抜け止めするための環状凸部３３が形成されている。接続管部３２内周の下方に、拡径段部３２ａが形成され、接続管部３２内周の上方には、周方向に均等な間隔をおいて４つの爪部３２ｂが形成されている（図１、４参照）。そして拡径段部３２ａに金属カラー７０下端面を配置し、爪部３２ｂにより金属カラー７０上端面が係止されて、金属カラー７０が接続管部３２内周に固定されるようになる。この金属カラー７０によって、接続管部３２の剛性を確保し、外部配管を締付固定した際の破損等を防止する。   The lid body 30 has a flange portion 31 welded to the periphery of the opening of the fuel tank, and a connecting pipe portion 32 to which the fuel supply pipe is connected. An annular convex portion 33 is formed on the outer periphery of the distal end portion of the connecting pipe portion 32 to prevent the external pipe from coming off when the fuel supply pipe is fastened and fixed with a hose band or the like. An enlarged diameter step portion 32a is formed below the inner periphery of the connecting pipe portion 32, and four claw portions 32b are formed above the inner periphery of the connecting tube portion 32 at equal intervals in the circumferential direction ( (See FIGS. 1 and 4). Then, the lower end surface of the metal collar 70 is arranged on the diameter-expanded step portion 32a, and the upper end surface of the metal collar 70 is locked by the claw portion 32b, so that the metal collar 70 is fixed to the inner periphery of the connecting pipe portion 32. The metal collar 70 ensures the rigidity of the connecting pipe portion 32 and prevents damage or the like when the external pipe is fastened and fixed.

また、フランジ部３１内周から、円筒壁３４が軸方向に突出し、更に、フランジ部３１周縁から内周方向に向かって環状突部３５が突出している。これらは後述する弁ケース４０の溝部４３ｃ、４３ｅにそれぞれ入り込んで、弁ケース４０と強固に結合されている。このような接合構造は、予め成形された弁ケース４０のフランジ部４３ｂの外周に、蓋体３０をインサート成形することによって形成されている。   Further, the cylindrical wall 34 protrudes in the axial direction from the inner periphery of the flange portion 31, and the annular protrusion 35 protrudes from the periphery of the flange portion 31 toward the inner peripheral direction. These respectively enter grooves 43c and 43e of the valve case 40 described later, and are firmly coupled to the valve case 40. Such a joint structure is formed by insert-molding the lid body 30 on the outer periphery of the flange portion 43b of the valve case 40 molded in advance.

図２に示される弁ケース４０は、燃料が自由に出入り可能とされた複数の窓部４１ａが形成された、ケース本体部４１を有している。このケース本体部４１の下縁部には、複数の係合孔４１ｂが形成され、後述する底蓋６０の係合爪が係合して、底蓋６０が取付け可能とされている。   The valve case 40 shown in FIG. 2 has a case main body 41 in which a plurality of windows 41a in which fuel can freely enter and exit are formed. A plurality of engagement holes 41b are formed in the lower edge of the case main body 41, and an engagement claw of the bottom cover 60 described later is engaged so that the bottom cover 60 can be attached.

そして、このケース本体部４１上方から次第に縮径する壁部を介して、筒部４３が延出している。上記次第に縮径する壁部の内周が本発明における弁座４２をなしている。この弁座４２は、所定の曲率で球面状に形成されている。より具体的には、図５に示されるように、曲率中心Ｏから所定の曲率半径Ｒでもって球面が形成されており、この面が後述する弁体５０のシール面５５との接触面となる。なお、曲率半径は、曲率の逆数と定義されており、すなわち、ゆるやかなカーブ形状のように曲率半径が大きいと曲率は小さくなり、一方、きついカーブ形状のように曲率半径が小さくなると曲率は大きくなる。また、曲率中心Ｏは、この実施形態の場合、接続管部３２の軸中心であって、後述するガイド突起６２の軸方向途中が基点とされている。   And the cylinder part 43 is extended through the wall part gradually diameter-reduced from this case main-body part 41 upper direction. The inner periphery of the wall portion that gradually decreases in diameter forms the valve seat 42 in the present invention. The valve seat 42 is formed in a spherical shape with a predetermined curvature. More specifically, as shown in FIG. 5, a spherical surface is formed with a predetermined curvature radius R from the center of curvature O, and this surface becomes a contact surface with a seal surface 55 of the valve body 50 described later. . Note that the radius of curvature is defined as the reciprocal of the curvature, that is, if the radius of curvature is large, such as a gentle curve shape, the curvature is small, while if the radius of curvature is small, such as a tight curve shape, the curvature is large. Become. In the case of this embodiment, the center of curvature O is the axial center of the connecting pipe portion 32, and the midpoint in the axial direction of a guide projection 62 described later is the base point.

また、筒部４３上方には、周方向外側に環状突出部４３ａが突設され、この環状突出部４３ａ内周から立設した壁部４３ｄを介して、壁部４３ｄから周方向外側に広がるフランジ部４３ｂが形成されている。このフランジ部４３ｂには、周方向に均等な間隔をおいて、複数の孔４３ｆが形成されている。そして、蓋体３０と弁ケース４０とがインサート成形される際には、筒部４３先端周壁と壁部４３ｄとの間の溝部４３ｅ、及び、環状突出部４３ａとフランジ部４３ｂとの間の溝部４３ｃに、前述した蓋体３０の円筒壁３４、環状突部３５がそれぞれ入り込み、更にフランジ部４３ｂの孔４３ｆには、蓋体３０の溶融した部分が入り込んで、インサート成形後の接合強度を高くして蓋体３０と弁ケース４０とが接合される（図４参照）。   Further, an annular projecting portion 43a is provided on the outer side in the circumferential direction above the cylindrical portion 43, and a flange that spreads outward from the wall portion 43d in the circumferential direction through a wall portion 43d that stands from the inner periphery of the annular projecting portion 43a. A portion 43b is formed. In the flange portion 43b, a plurality of holes 43f are formed at equal intervals in the circumferential direction. When the lid 30 and the valve case 40 are insert-molded, the groove 43e between the distal end peripheral wall of the cylinder 43 and the wall 43d and the groove between the annular protrusion 43a and the flange 43b. 43c, the cylindrical wall 34 and the annular protrusion 35 of the lid body 30 described above enter, respectively, and the melted portion of the lid body 30 enters the hole 43f of the flange portion 43b to increase the bonding strength after insert molding. Then, the lid 30 and the valve case 40 are joined (see FIG. 4).

ケース本体部４１には、弁体５０が上下スライド可能に収容されている。この弁体５０は、燃料非透過性のポリアセタール（ＰＯＭ）等の樹脂製であり、その上面中央部に円錐状の***部５１を有している（図３（ａ）参照）。図３（ｂ）を併せて参照すると、***部５１から均等な間隔をおいて、４本のガイド羽根５２が立設されている。これらのガイド羽根５２は、筒部４３内に挿入され、弁体５０のスライドをガイドする役割をなしている。   A valve body 50 is accommodated in the case main body 41 so as to be slidable up and down. The valve body 50 is made of resin such as non-fuel-permeable polyacetal (POM) and has a conical raised portion 51 at the center of the upper surface (see FIG. 3A). Referring also to FIG. 3 (b), four guide blades 52 are erected at an equal interval from the raised portion 51. These guide blades 52 are inserted into the cylindrical portion 43 and serve to guide the slide of the valve body 50.

また、***部５１の周縁から平坦部５３が広がっている（図３（ａ）、（ｂ）参照）。そのため燃料の供給の際に、流入する燃料が平坦部５３に衝突して、その燃料の圧力を受け易くなるので、弁体５０がスムーズに開くようになる。   Moreover, the flat part 53 has spread from the periphery of the protruding part 51 (refer FIG. 3 (a), (b)). Therefore, when the fuel is supplied, the inflowing fuel collides with the flat portion 53 and easily receives the pressure of the fuel, so that the valve body 50 opens smoothly.

更に、図３（ｄ）に示されるように、平坦部５３周縁から折曲部５４を介して、斜め外方に伸びてスカート状をなしたシール面５５が形成されている。このシール面５５が、前述した弁ケース４０の弁座４２に接触する部分となり、接続管部３２に連通する燃料通路を閉塞する。また、シール面５５は、前述した弁座４２の曲率半径Ｒ及び曲率中心Ｏとほぼ同じ曲率半径及び曲率中心を有する球面形状をなしている（図５参照）。   Further, as shown in FIG. 3D, a skirt-like seal surface 55 is formed extending obliquely outward from the periphery of the flat portion 53 via the bent portion 54. This seal surface 55 becomes a portion that contacts the valve seat 42 of the valve case 40 described above, and closes the fuel passage that communicates with the connecting pipe portion 32. Further, the sealing surface 55 has a spherical shape having substantially the same radius of curvature and center of curvature as the curvature radius R and center of curvature O of the valve seat 42 described above (see FIG. 5).

また、折曲部５４の裏面側は環状にへこんでおり、平坦部５３及びシール面５５と比較して薄肉とされた薄肉部５４ａとなっている（図３（ｄ）参照）。そのため、折曲部５４がより撓みやすくなるので、弁座４２とシール面５５とがより密着しやすくなり、シール性を向上させる。   Moreover, the back surface side of the bent portion 54 is dented in an annular shape to form a thin portion 54a that is thinner than the flat portion 53 and the seal surface 55 (see FIG. 3D). For this reason, the bent portion 54 is more easily bent, so that the valve seat 42 and the seal surface 55 are more likely to be in close contact with each other, and the sealing performance is improved.

更に、***部５１の裏面中心からガイド軸５６が垂設しており、このガイド軸５６基端外周にバネ受け部５７が形成され、このバネ受け部５７周縁から均等な間隔をおいて、放射状に伸びる複数のリブ５８が形成されている（図３（ａ）、（ｃ）参照）。このリブ５８によって、弁体５０が補強されるとともに耐久性が向上するようになるので、燃料供給時の燃料圧力や外力を受けた場合や、長期間に渡って使用した場合であっても、弁体５０の破損等を効果的に防止する。   Further, a guide shaft 56 is suspended from the center of the back surface of the raised portion 51, and a spring receiving portion 57 is formed on the outer periphery of the base end of the guide shaft 56. The spring receiving portion 57 is radially spaced from the periphery of the spring receiving portion 57. A plurality of ribs 58 extending in a straight line are formed (see FIGS. 3A and 3C). The ribs 58 reinforce the valve body 50 and improve the durability. Therefore, even when receiving fuel pressure or external force during fuel supply or when used for a long period of time, The damage of the valve body 50 is effectively prevented.

ケース本体部４１の下面には、底蓋６０が、その外周に設けた爪６１を、ケース本体部４１の係合孔４１ｂに係合させることにより取付けられている。底蓋６０は、その中心部からガイド突起６２が突設され、このガイド突起６２を囲むように環状のリブ６３が形成され、このリブ６３の内側にコイルスプリング７１の下端が支持される。また、ガイド突起６２は、弁体５０のガイド軸５６内部に入り込んで、弁体５０のスライド動作をガイドしている。そして、前記コイルスプリング７１の上端は、弁体５０のバネ受け部５７に当接して、弁体５０を常時上方に向けて付勢している。   A bottom lid 60 is attached to the lower surface of the case main body 41 by engaging a claw 61 provided on the outer periphery thereof with an engagement hole 41 b of the case main body 41. The bottom cover 60 is provided with a guide protrusion 62 projecting from the center thereof, and an annular rib 63 is formed so as to surround the guide protrusion 62, and the lower end of the coil spring 71 is supported inside the rib 63. The guide protrusion 62 enters the guide shaft 56 of the valve body 50 to guide the sliding operation of the valve body 50. The upper end of the coil spring 71 is in contact with the spring receiving portion 57 of the valve body 50, and always biases the valve body 50 upward.

次に、上記逆流防止バルブ１０の作用について説明する。   Next, the operation of the backflow prevention valve 10 will be described.

このバルブ１０は、図６に示される燃料タンク１の開口部２に挿入され、蓋体３０のフランジ部３１を開口部２周縁に熱板溶着、超音波溶着等により溶着することによって、燃料タンク１に取付けられる。そして、接続管部３２外周に、燃料供給管３の一端部が差し込まれて、ホースバンド４によって締め付け固定されて、燃料供給管３と燃料タンク１とが、バルブ１０を介して連結される。   This valve 10 is inserted into the opening 2 of the fuel tank 1 shown in FIG. 6, and the flange 31 of the lid 30 is welded to the periphery of the opening 2 by hot plate welding, ultrasonic welding, etc. 1 is attached. Then, one end of the fuel supply pipe 3 is inserted into the outer periphery of the connection pipe part 32 and is fastened and fixed by the hose band 4, and the fuel supply pipe 3 and the fuel tank 1 are connected via the valve 10.

そして、図示しない給油口から燃料が供給され、この給油口に接続された上記燃料供給管３内に燃料が供給されると、燃料は蓋体３０の接続管部３２、弁ケース４０のケース本体部内の燃料通路を通り、弁体５０に燃料圧力が加わるようになると、図４中の弁体５０の想像線に示されるように、弁体５０をコイルスプリング７１の付勢力に抗して下方にスライドさせて、弁座４２に圧接されていた弁体５０のシール面５５が、弁座４２から離れ弁が開かれて、燃料が燃料タンク１内に充填される。また、燃料の供給が終了すると、コイルスプリング７１の付勢力によって弁体５０が上方にスライドして（図４参照）、弁座４２と圧接して燃料通路を閉じ、燃料タンク１内の圧力によって燃料が燃料供給管内を逆流して、燃料の吹き返し等が生じるのを防止したり、燃料供給時以外でも燃料蒸気や、燃料自体が外部へ流出したりすることを防止する。   When fuel is supplied from a fuel supply port (not shown) and fuel is supplied into the fuel supply pipe 3 connected to the fuel supply port, the fuel is connected to the connection pipe portion 32 of the lid 30 and the case body of the valve case 40. When the fuel pressure is applied to the valve body 50 through the fuel passage in the section, the valve body 50 is moved downward against the urging force of the coil spring 71 as shown by the imaginary line of the valve body 50 in FIG. The seal surface 55 of the valve body 50 that has been in pressure contact with the valve seat 42 is separated from the valve seat 42 and the valve is opened, so that the fuel tank 1 is filled with fuel. When the supply of fuel is completed, the valve body 50 slides upward by the biasing force of the coil spring 71 (see FIG. 4), presses against the valve seat 42 to close the fuel passage, and the pressure in the fuel tank 1 The fuel prevents the fuel from flowing back in the fuel supply pipe to prevent the fuel from being blown back, or prevents the fuel vapor or the fuel itself from flowing out to the outside even when the fuel is supplied.

この際、弁座４２とこれに接触する弁体５０のシール面５５とが、ほぼ同一の曲率、言い換えると、ほぼ同一の曲率半径Ｒで、かつ、ほぼ同一の曲率中心Ｏをもつ球面をなしているので、弁座４２と弁体５０のシール面５５との間に隙間がほとんど生じない状態で、弁座４２に対して広い接触面積で弁体５０のシール面５５が当接するようになり、弁座４２と弁体５０とのシール性を向上させることができる。   At this time, the valve seat 42 and the sealing surface 55 of the valve body 50 in contact with the valve seat 42 have substantially the same curvature, in other words, a spherical surface having substantially the same curvature radius R and substantially the same curvature center O. Therefore, the seal surface 55 of the valve body 50 comes into contact with the valve seat 42 with a wide contact area in a state where there is almost no gap between the valve seat 42 and the seal surface 55 of the valve body 50. The sealing performance between the valve seat 42 and the valve body 50 can be improved.

また、車両の揺れ等によって、燃料タンク１が斜めに傾いたりして、弁座４２に対して弁体５０が傾いて当接した場合でも、弁座４２と弁体５０のシール面５５とが、ほぼ同一の曲率半径Ｒで、かつ、ほぼ同一の曲率中心Ｏをもつ球面どうしの接触となるので、シール性の低下を防止することができる。   Further, even when the fuel tank 1 tilts obliquely due to vehicle shake or the like, and the valve body 50 tilts and contacts the valve seat 42, the valve seat 42 and the seal surface 55 of the valve body 50 are not in contact with each other. Since spherical surfaces having substantially the same radius of curvature R and substantially the same center of curvature O are brought into contact with each other, it is possible to prevent deterioration in sealing performance.

更に、弁体５０には、上記特許文献１、２のように、ゴム製のシール部材が不要なので、部品点数を少なくすることができ、しかも、組付け作業も不要となるので、コストの低減を図ることができる。また、ゴム製のシール部材が不要となるので、燃料のアルコール濃度を気にする必要がなく、信頼性が高いバルブが得られる。   Further, since the rubber seal member is not required for the valve body 50 as in the above-mentioned Patent Documents 1 and 2, the number of parts can be reduced, and the assembly work is also unnecessary, thereby reducing the cost. Can be achieved. Further, since a rubber seal member is not required, there is no need to worry about the alcohol concentration of the fuel, and a highly reliable valve can be obtained.

以上説明した実施形態の作用効果を下記に簡単に説明する。   The effects of the embodiment described above will be briefly described below.

すなわち、本発明によれば、燃料供給がなされると、弾性手段の付勢力に抗して弁体が開き燃料タンク内に燃料が供給され、燃料供給が終了すると、弁体は燃料通路を閉塞して燃料の逆流を防止する。この際、弁座と弁体との接触面が、ほぼ同一の曲率及び曲率中心をもつ球面をなすので、弁座と弁体との間に隙間がほとんど生じず、弁座に広い接触面積で弁体が当接しシール性が向上する。なお、燃料タンクが斜めに傾いたりして、弁座に対して弁体が傾いて当接しても、ほぼ同一の曲率及び曲率中心をもつ球面どうしの接触となるため、シール性を良好に維持することができる。更に、ゴム製シール部材が不要なので、部品点数を少なく組付け作業も不要でコスト低減を図れ、燃料のアルコール濃度を気にする必要もなく、信頼性が高い。   That is, according to the present invention, when fuel is supplied, the valve body opens against the urging force of the elastic means to supply fuel into the fuel tank, and when the fuel supply ends, the valve body closes the fuel passage. This prevents backflow of fuel. At this time, the contact surface between the valve seat and the valve body is a spherical surface having substantially the same curvature and center of curvature, so there is almost no gap between the valve seat and the valve body, and the valve seat has a wide contact area. The valve body abuts and the sealing performance is improved. Even if the fuel tank tilts obliquely and the valve body tilts and contacts the valve seat, the spherical surfaces with almost the same curvature and center of curvature are in contact with each other, so that the sealing performance is maintained well. can do. Furthermore, since a rubber seal member is not required, the number of parts is reduced, assembly work is not required, the cost can be reduced, and there is no need to worry about the alcohol concentration of the fuel, resulting in high reliability.

また、弁体周縁に折曲部を介してシール面を設けたので、弁座に接触する接触面積を広くすることができ、シール性が一層向上する。   Moreover, since the sealing surface is provided on the periphery of the valve body via the bent portion, the contact area that contacts the valve seat can be increased, and the sealing performance is further improved.

更に、折曲部裏面に薄肉部を形成したので、折曲部がより撓みやすくなり、弁座とシール面とがより密着しやすくなり、シール性を向上させることができる。   Further, since the thin portion is formed on the back surface of the bent portion, the bent portion is more easily bent, the valve seat and the seal surface are more easily adhered, and the sealing performance can be improved.

更に、弁体の裏面中心から放射状に伸びるリブを形成したので、弁体の補強、耐久性向上等の効果が得られ、弁体の破損等を効果的に防止する。   Furthermore, since ribs extending radially from the center of the back surface of the valve body are formed, effects such as reinforcement of the valve body and improvement of durability can be obtained, and damage to the valve body can be effectively prevented.

また、弁体の弁座への接触面より内周側に平坦部が形成されており、この平坦部によって燃料供給時に燃料圧力を受け易くなるので、弁体がスムーズに開くようになる。   In addition, a flat portion is formed on the inner peripheral side from the contact surface of the valve body with the valve seat, and the flat portion easily receives fuel pressure when fuel is supplied, so that the valve body opens smoothly.

なお、上記実施形態におけるコイルスプリング７１が、本発明における弾性手段をなしている。   In addition, the coil spring 71 in the said embodiment has comprised the elastic means in this invention.

本発明の燃料逆流防止バルブ１０における、弁座と弁体とのシール性を試験した。   The sealing performance between the valve seat and the valve body in the fuel backflow prevention valve 10 of the present invention was tested.

実施例
図１に示されるバルブ１０を作製した。この際、蓋体３０は、ポリエチレンで形成し、それ以外のコイルスプリング７１を除く各部材を、ポリアセタール（ＰＯＭ）で形成した。 Example A valve 10 shown in FIG. 1 was produced. At this time, the lid 30 was made of polyethylene, and the other members except the coil spring 71 were made of polyacetal (POM).

比較例
前記特許文献２に記載されたバルブから、ゴム製のシール部材を取り除いた燃料逆流防止バルブを得た。このバルブは、弁体のシール面及び弁座が球面状をなしていない点が上記実施例と異なっている。 Comparative Example From the valve described in Patent Document 2, a fuel backflow prevention valve was obtained by removing the rubber seal member. This valve is different from the above embodiment in that the sealing surface of the valve body and the valve seat are not spherical.

試験方法
以上の実施例及び比較例のバルブを用いて、図４に示されるように、弁座に弁体が当接して燃料通路をシールした状態で、弁ケースの下方から１５ｋＰａの燃料圧で加圧した。その際に、燃料通路から、１分間で何ｃｃの燃料が漏れるかを測定した。なお、比較例では、３つのバルブについて行い、実施例では、５つのバルブについて行なった。その結果を、表１にし示す。 Test Method Using the valves of the above examples and comparative examples, as shown in FIG. 4, with the valve body abutting against the valve seat and sealing the fuel passage, the fuel pressure of 15 kPa was applied from below the valve case. Pressurized. At that time, it was measured how many cc of fuel leaked from the fuel passage in one minute. In addition, it carried out about three valves in the comparative example, and carried out about five valves in the Example. The results are shown in Table 1.

Figure 2006123576
Figure 2006123576

上記表１より、比較例のバルブでは、その漏れ量が４１〜１５３ｃｃと極めて多く、またバラツキも大きいことが分かる。これに対し、実施例のバルブでは、漏れ量が０．３〜１．５ｃｃと、比較例に比べて極めて小さく、バラツキも比較的小さいことが分かった。このように本発明のバルブによれば、ゴム製のシール部材を用いずとも、弁座に対して弁体がしっかりと密着して、安定して十分なシール性が得られることが理解できる。   From Table 1 above, it can be seen that the valve of the comparative example has an extremely large leakage amount of 41 to 153 cc and a large variation. On the other hand, in the valve | bulb of the Example, it turned out that the amount of leaks is 0.3-1.5cc and is very small compared with a comparative example, and its variation is also comparatively small. Thus, according to the valve of the present invention, it can be understood that the valve body is firmly attached to the valve seat without using a rubber seal member, and a sufficient sealing performance can be obtained stably.

本発明は、自動車等の燃料タンクに取付けられ、ゴム製のシール部材を用いずとも、シール性を十分に確保して、燃料の逆流を確実に防止することができるとともに、部品点数及び組付け工数を少なくして、コストの低減を図ることができる燃料逆流防止バルブとして利用することができる。   The present invention is attached to a fuel tank of an automobile or the like, and can secure a sufficient sealing performance without using a rubber seal member to reliably prevent a back flow of fuel. It can be used as a fuel backflow prevention valve that can reduce the number of steps and reduce the cost.

本発明の燃料逆流防止バルブの一実施形態を示す分解斜視図である。It is a disassembled perspective view which shows one Embodiment of the fuel backflow prevention valve of this invention. 同燃料逆流防止バルブを構成する弁ケースの断面図である。It is sectional drawing of the valve case which comprises the fuel backflow prevention valve. 同燃料逆流防止バルブを構成する弁体を示しており、（ａ）は正面図、（ｂ）は平面図、（ｃ）は底面図、（ｄ）は断面図である。The valve body which comprises the same fuel backflow prevention valve is shown, (a) is a front view, (b) is a top view, (c) is a bottom view, (d) is sectional drawing. 同燃料逆流防止バルブを組み立てた状態を示す断面図である。It is sectional drawing which shows the state which assembled the fuel backflow prevention valve. 同燃料逆流防止バルブを弁体及び弁座の形状を説明する部分拡大図である。It is the elements on larger scale explaining the shape of a valve body and a valve seat of the fuel backflow prevention valve. 同燃料逆流防止バルブを燃料タンクに取付けた状態を示す説明図である。It is explanatory drawing which shows the state which attached the fuel backflow prevention valve to the fuel tank.

符号の説明Explanation of symbols

１ 燃料タンク
２ 開口部
３ 燃料供給管
１０ 燃料逆流防止バルブ（バルブ）
２０ ハウジング
３０ 蓋体
３１ フランジ部
３２ 接続管部
４０ 弁ケース
４１ ケース本体部
４２ 弁座
４３ 筒部
５０ 弁体
５１ ***部
５２ ガイド羽根
５３ 平坦部
５４ 折曲部
５４ａ 薄肉部
５５ シール面
６０ 底蓋
７０ 金属カラー
７１ コイルスプリング（弾性手段）
Ｏ 曲率中心
Ｒ 曲率半径
1 Fuel Tank 2 Opening 3 Fuel Supply Pipe 10 Fuel Backflow Prevention Valve (Valve)
DESCRIPTION OF SYMBOLS 20 Housing 30 Cover body 31 Flange part 32 Connection pipe part 40 Valve case 41 Case main-body part 42 Valve seat 43 Cylinder part 50 Valve body 51 Raised part 52 Guide blade 53 Flat part 54 Bending part 54a Thin part 55 Seal surface 60 Bottom cover 70 Metal collar 71 Coil spring (elastic means)
O Curvature center R Curvature radius

Claims (5)

燃料タンクに取付けられて、その一端が燃料供給管に連結され、他端が燃料タンク内に開口されるハウジングと、このハウジングの燃料通路に設けられた弁座と、この弁座に対して燃料タンク内に連通する側から弾性手段により圧接された弁体とを備え、前記弁座と前記弁体との接触面が、ほぼ同一の曲率で、かつ、ほぼ同一の曲率中心をもつ球面をなしていることを特徴とする燃料逆流防止バルブ。   A housing attached to a fuel tank, one end of which is connected to a fuel supply pipe and the other end is opened in the fuel tank, a valve seat provided in a fuel passage of the housing, and a fuel for the valve seat A valve body pressed by elastic means from the side communicating with the tank, and the contact surface of the valve seat and the valve body has a spherical surface having substantially the same curvature and substantially the same center of curvature. A fuel backflow prevention valve characterized by comprising: 前記弁体は、その周縁が折曲部を介して斜め外方に伸びてスカート状をなし、このスカート状部分が前記曲率及び曲率中心を有する球面をなしている請求項１記載の燃料逆流防止バルブ。   2. The fuel backflow prevention according to claim 1, wherein a peripheral edge of the valve body extends obliquely outward through a bent portion to form a skirt shape, and the skirt-shaped portion has a spherical surface having the curvature and the center of curvature. valve. 前記折曲部の裏面側が環状にへこんで薄肉部を構成している請求項２記載の燃料逆流防止バルブ。   The fuel backflow prevention valve according to claim 2, wherein a back surface side of the bent portion is annularly formed to constitute a thin portion. 前記弁体の裏面中心から放射状に伸びるリブが形成されている請求項１〜３のいずれか１つに記載の燃料逆流防止バルブ。   The fuel backflow prevention valve according to any one of claims 1 to 3, wherein a rib extending radially from the center of the back surface of the valve body is formed. 前記弁体の前記弁座への接触面より内周側に平坦部が形成されている請求項１〜４のいずれか１つに記載の燃料逆流防止バルブ。   The fuel backflow prevention valve according to any one of claims 1 to 4, wherein a flat portion is formed on an inner peripheral side from a contact surface of the valve body to the valve seat.
JP2004310518A 2004-10-26 2004-10-26 Fuel backflow prevention valve Expired - Fee Related JP4660156B2 (en)

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Application Number Priority Date Filing Date Title
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JP4660156B2 JP4660156B2 (en) 2011-03-30

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100793900B1 (en) 2006-12-06 2008-01-15 기아자동차주식회사 Fuel reverse prevention device for vehicle fuel filler
JP2009092180A (en) * 2007-10-11 2009-04-30 Yachiyo Industry Co Ltd Valve structure
JP2009101748A (en) * 2007-10-19 2009-05-14 Honda Motor Co Ltd Inlet structure of fuel tank
JP2010089757A (en) * 2008-10-10 2010-04-22 Piolax Inc Fuel check-valve
JP2010111316A (en) * 2008-11-07 2010-05-20 Piolax Inc Pipe joint for fuel tank
US8042788B2 (en) 2006-09-15 2011-10-25 Toyoda Gosei Co., Ltd. Valve device for fuel tank

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JPS6345322U (en) * 1986-09-12 1988-03-26
JPH0321512U (en) * 1989-07-11 1991-03-04
JPH10119594A (en) * 1996-10-18 1998-05-12 Toyoda Gosei Co Ltd Fuel tank
JP2001163069A (en) * 1999-03-31 2001-06-19 Toyoda Gosei Co Ltd Oil feeder for fuel tank, and fuel tank
JP2002054519A (en) * 2000-06-01 2002-02-20 Piolax Inc Cap for fuel tank
JP2004028043A (en) * 2002-06-28 2004-01-29 Nifco Inc Check valve

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5121723U (en) * 1974-08-08 1976-02-17
JPS6345322U (en) * 1986-09-12 1988-03-26
JPH0321512U (en) * 1989-07-11 1991-03-04
JPH10119594A (en) * 1996-10-18 1998-05-12 Toyoda Gosei Co Ltd Fuel tank
JP2001163069A (en) * 1999-03-31 2001-06-19 Toyoda Gosei Co Ltd Oil feeder for fuel tank, and fuel tank
JP2002054519A (en) * 2000-06-01 2002-02-20 Piolax Inc Cap for fuel tank
JP2004028043A (en) * 2002-06-28 2004-01-29 Nifco Inc Check valve

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8042788B2 (en) 2006-09-15 2011-10-25 Toyoda Gosei Co., Ltd. Valve device for fuel tank
KR100793900B1 (en) 2006-12-06 2008-01-15 기아자동차주식회사 Fuel reverse prevention device for vehicle fuel filler
JP2009092180A (en) * 2007-10-11 2009-04-30 Yachiyo Industry Co Ltd Valve structure
JP2009101748A (en) * 2007-10-19 2009-05-14 Honda Motor Co Ltd Inlet structure of fuel tank
JP2010089757A (en) * 2008-10-10 2010-04-22 Piolax Inc Fuel check-valve
JP2010111316A (en) * 2008-11-07 2010-05-20 Piolax Inc Pipe joint for fuel tank
KR101493438B1 (en) 2008-11-07 2015-02-16 파이오락스(주 ) Pipe joint for fuel tank

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