JP6408560B2 - Check valve for fuel supply pipe - Google Patents

Check valve for fuel supply pipe Download PDF

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Publication number
JP6408560B2
JP6408560B2 JP2016509776A JP2016509776A JP6408560B2 JP 6408560 B2 JP6408560 B2 JP 6408560B2 JP 2016509776 A JP2016509776 A JP 2016509776A JP 2016509776 A JP2016509776 A JP 2016509776A JP 6408560 B2 JP6408560 B2 JP 6408560B2
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flapper
check valve
bearing
supply pipe
rotating shaft
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JPWO2015145694A1 (en
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博光 吉田
博光 吉田
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Asteer Co Ltd
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Asteer Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/04—Tank inlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/04—Tank inlets
    • B60K2015/0458—Details of the tank inlet
    • B60K2015/0461—Details of the tank inlet comprising a filler pipe shutter, e.g. trap, door or flap for fuel inlet

Description

本発明は、燃料の逆流を防止する逆止弁に関する。   The present invention relates to a check valve that prevents backflow of fuel.

自動車に給油する際には、給油口に給油ノズルを挿入し、給油口に接続された給油管を経て、燃料タンクに燃料を流し込む。給油ノズルから勢いよく燃料が供給されるため、燃料タンク内の液位が高くなると燃料が給油管を逆流して給油口から溢れることがある。 When refueling an automobile, a refueling nozzle is inserted into the refueling port, and fuel is poured into the fuel tank through a refueling pipe connected to the refueling port. Since the fuel is vigorously supplied from the fuel filler nozzle, when the liquid level in the fuel tank becomes high, the fuel may flow backward through the fuel filler pipe and overflow from the fuel filler port.

燃料の逆流を防ぐために、給油管には逆止弁が取り付けられる。例えば、特許文献１には、給油管への挿入部と弁体とからなる逆止弁が開示されている。弁体は、捩じりコイルバネによって挿入部の開口に対して押し付けられる。燃料が挿入部の基端から流れ込むと、先端の開口に押し付けられた弁体が燃料の圧力によって押し開かれて、燃料の通過を許す。一方、弁体によって挿入部の先端の開口は塞がれているので、先端側から燃料が挿入部に流入することはない。 In order to prevent the backflow of fuel, a check valve is attached to the fuel supply pipe. For example, Patent Document 1 discloses a check valve including an insertion portion for a fuel supply pipe and a valve body. The valve body is pressed against the opening of the insertion portion by a torsion coil spring. When the fuel flows in from the proximal end of the insertion portion, the valve body pressed against the opening at the distal end is pushed open by the pressure of the fuel to allow the passage of the fuel. On the other hand, since the opening at the distal end of the insertion portion is blocked by the valve body, fuel does not flow into the insertion portion from the distal end side.

特許文献２には、ボディと弁プレートとからなる逆止弁が開示されている。ボディは筒状体からなり、給油管に嵌め込まれる。弁プレートはボディ先端の開口に取り付けられ、図２４等に記載されている取付部（符号４４ｋ）の弾性変形によって、ボディ先端の開口を開閉する。ボディの基端から燃料が流れ込むと、燃料が先端の開口に押し付けられた弁プレートを押して、取付部を変形させて燃料の通過を許す。一方、弁体は支持突起（符号３８）により支えられているので、先端側から燃料がボディ内部に流入し難くなっている。 Patent Document 2 discloses a check valve including a body and a valve plate. The body is a cylindrical body and is fitted into the oil supply pipe. The valve plate is attached to the opening at the front end of the body, and opens and closes the opening at the front end of the body by elastic deformation of a mounting portion (reference numeral 44k) illustrated in FIG. When the fuel flows from the base end of the body, the fuel is pushed against the opening at the front end to push the valve plate, thereby deforming the mounting portion and allowing the fuel to pass. On the other hand, since the valve body is supported by the support protrusion (reference numeral 38), it is difficult for the fuel to flow into the body from the front end side.

特許文献３には、管状のボデーとフラッパと捩じりバネとからなる逆止弁が開示されている。管状のボデーを給油管の先端に嵌め込んで、捩じりコイルバネでフラッパを給油管先端の開口に押し付ける構成である。 Patent Document 3 discloses a check valve including a tubular body, a flapper, and a torsion spring. A tubular body is fitted into the end of the oil supply pipe, and the flapper is pressed against the opening at the end of the oil supply pipe with a torsion coil spring.

特許第３６５６６９１号公報Japanese Patent No. 3656691 特許第３１５２１００号公報Japanese Patent No. 3152100 特許第４１０３０４９号公報Japanese Patent No. 4103049

特許文献１及び３の逆止弁は、捩じりコイルバネを用いて弁体を給油管の流路を塞ぐ方向に押し付ける構成である。これらの逆止弁は捩じりコイルバネを用いるため、部品点数が多く、組み付け作業が煩雑である。特許文献２の逆止弁は、取付部（符号４４ｋ）として金属の薄い板バネを採用しているものと思われる。板バネはプレス加工によって打ち抜いて成形するため、その端部は鋭利になっているものと推測される。したがって、組み付け作業の際に作業員が受傷しないように配慮する必要があり、やはり組み付け作業が煩雑である。 The check valves of Patent Documents 1 and 3 have a configuration in which a valve body is pressed in a direction to close a flow path of an oil supply pipe using a torsion coil spring. Since these check valves use torsion coil springs, the number of parts is large and the assembly work is complicated. The check valve of Patent Document 2 seems to employ a thin metal leaf spring as the mounting portion (reference numeral 44k). Since the leaf spring is stamped and formed by press working, it is presumed that the end portion is sharp. Therefore, it is necessary to take care not to injure the worker during the assembling work, and the assembling work is also complicated.

本発明は、逆止弁の部品点数を減らすことにより、ボデーに対してフラッパを簡単に組み付けられるようにする。これによって、材料コスト及び組み付け作業に要するコストを低減する。さらに、逆止弁の弾性体が誤って脱落しないようにする。 The present invention allows the flapper to be easily assembled to the body by reducing the number of check valve components. This reduces the material cost and the cost required for the assembly work. Furthermore, the elastic body of the check valve is prevented from dropping off accidentally.

本発明は、給油管に取り付けられるボデーと、ボデーに対して回転可能に取り付けることで給油管の開口を開閉するフラッパとからなる燃料給油管の逆止弁である。ボデーは、回転軸及び軸受の嵌合部と、一端がボデーに接続され他端が自由端でありフラッパを閉方向に押える弾性体とを一体に成形した部材である。フラッパは、給油管の開口を開閉する蓋部と、回転軸及び軸受の嵌合部とを備える部材である。ボデー側の嵌合部とフラッパ側の嵌合部とを嵌め合わせることでフラッパはボデーに対して回転可能に組み付けられ、フラッパを開方向に回動した状態において弾性体はフラッパを閉方向に押圧する。本発明の逆止弁においては、ボデー側の嵌合部と弾性体とを一体に成形し、弾性体でフラッパを閉方向に押圧することにした。これにより、従来使用されていたコイルばねを逆止弁に組み付ける必要がなくなり、部品点数を減らすことができる。しかも、弾性体はボデーと一体に構成されているので弾性体が誤って脱落するおそれがない。 The present invention is a check valve for a fuel supply pipe comprising a body attached to the fuel supply pipe and a flapper that opens and closes the opening of the fuel supply pipe by being rotatably attached to the body. The body is a member formed by integrally forming a fitting portion of the rotating shaft and the bearing, and an elastic body having one end connected to the body and the other end being a free end and pressing the flapper in the closing direction. The flapper is a member that includes a lid portion that opens and closes an opening of the oil supply pipe, and a fitting portion of the rotating shaft and the bearing. By fitting the fitting part on the body side and the fitting part on the flapper side, the flapper is rotatably assembled to the body, and the elastic body presses the flapper in the closing direction when the flapper is rotated in the opening direction. To do. In the check valve of the present invention, the body-side fitting portion and the elastic body are integrally formed, and the flapper is pressed in the closing direction by the elastic body. Thereby, it is not necessary to assemble a conventionally used coil spring to the check valve, and the number of parts can be reduced. Moreover, since the elastic body is integrally formed with the body, there is no possibility that the elastic body will fall off accidentally.

上記の逆止弁において、フラッパは、蓋部とフラッパ側の嵌合部とを一体に成形して構成することが好ましい。これにより、部品点数をさらに減じて、組み立て作業を簡便にすることができる。 In the above-described check valve, the flapper is preferably configured by integrally forming a lid portion and a fitting portion on the flapper side. Thereby, the number of parts can be further reduced, and the assembling work can be simplified.

ボデー側の嵌合部とフラッパ側の嵌合部とを嵌め合わせた状態において、フラッパが開く際の回転軌跡上に弾性体の自由端を配置することが好ましい。このように構成することで、フラッパが開く際に弾性体の自由端に対して確実にフラッパの一部を接触させることができる。フラッパが開くと自由端を力点として弾性体が歪んでいく。これによって、フラッパには給油口を閉じようとする応力が掛かる。給油が終わると、フラッパはこの応力にしたがって閉じる。 In a state where the body-side fitting portion and the flapper-side fitting portion are fitted together, it is preferable to dispose the free end of the elastic body on the rotation locus when the flapper opens. By comprising in this way, when a flapper opens, a part of flapper can be reliably made to contact with the free end of an elastic body. When the flapper opens, the elastic body is distorted with the free end as the power point. As a result, the flapper is subjected to a stress that attempts to close the fuel filler opening. When refueling is finished, the flapper closes according to this stress.

上記の逆止弁において、弾性体の自由端は、フラッパを押圧する押突起を備えるように構成することが好ましい。自由端に突起を設けることで、弾性体に生じた応力を効率よく伝えることができる。これによって、給油完了後に迅速かつ確実にフラッパを閉じることができる。 In the above-described check valve, it is preferable that the free end of the elastic body is configured to include a push projection that presses the flapper. By providing the protrusion at the free end, the stress generated in the elastic body can be transmitted efficiently. As a result, the flapper can be closed quickly and reliably after refueling is completed.

ボデー及びフラッパは、耐油性の繊維強化プラスチックから構成することが好ましい。給油管の先端が燃料タンクの中に挿入される構成が一般的である。燃料タンクには防錆のために粉体塗装を施す。このとき、燃料タンク内の温度が上昇する。この場合、高温下における逆止弁の寸法変化が問題となる。耐油性の繊維強化プラスチックを使用すれば、寸法変化を低減することが可能であるので、給油管の先端に逆止弁を配置することが可能になる。 The body and flapper are preferably composed of an oil-resistant fiber reinforced plastic. In general, the tip of the fuel supply pipe is inserted into the fuel tank. Powder coating is applied to the fuel tank to prevent rust. At this time, the temperature in the fuel tank rises. In this case, the dimensional change of the check valve at a high temperature becomes a problem. If oil-resistant fiber reinforced plastic is used, it is possible to reduce the dimensional change, so that a check valve can be arranged at the tip of the oil supply pipe.

上記の逆止弁において、ボデー側の嵌合部は軸受であり、フラッパ側の嵌合部は回転軸であってもよい。また、ボデー側の嵌合部は回転軸であり、フラッパ側の嵌合部は軸受であってもよい。両者の場合において、軸受は切り欠きを有しており、軸受の切り欠きに対して回転軸を押し付けると、軸受が、弾性変形して回転軸を回転可能に嵌合し、元の形状に復帰して回転軸の脱落を防止するようにすることが好ましい。また、両者の場合において、軸受を環状に構成してもよい。この場合は、軸受を構成する支持突起又は回転軸が接続される突板を弾性変形させて、回転軸を軸受に回転可能に嵌合させる。このように構成することで、フラッパ側又はボデー側の回転軸をフラッパ側又はボデー側の軸受に対して押し付けることで、フラッパを簡単にボデーに組み付けることができる。 In the above check valve, the body-side fitting portion may be a bearing, and the flapper-side fitting portion may be a rotating shaft. The fitting part on the body side may be a rotating shaft, and the fitting part on the flapper side may be a bearing. In both cases, the bearing has a notch, and when the rotating shaft is pressed against the notch of the bearing, the bearing is elastically deformed and the rotating shaft is rotatably fitted to return to its original shape. Thus, it is preferable to prevent the rotating shaft from falling off. In both cases, the bearing may be configured in an annular shape. In this case, a support protrusion or a projecting plate connected to the rotating shaft constituting the bearing is elastically deformed, and the rotating shaft is rotatably fitted to the bearing. With this configuration, the flapper can be easily assembled to the body by pressing the flapper side or body side rotating shaft against the flapper side or body side bearing.

従来は、別途設けた捩じりコイルばね等によりフラッパを閉方向に押圧していた。本発明では、ボデーを回転軸及び軸受の嵌合部と、一端がボデーに接続され他端が自由端でありフラッパを閉方向に押える弾性体とを一体に成形してなる。弾性体を一体に成形しているので部品点数を少なくして、フラッパの組み付け作業を簡便に行うことができる。しかも、弾性体を一体に成形しているので、誤って弾性体が脱落するおそれがない。 Conventionally, the flapper is pressed in the closing direction by a torsion coil spring or the like provided separately. In the present invention, the body is formed by integrally forming the fitting portion of the rotating shaft and the bearing and the elastic body having one end connected to the body and the other end being a free end and pressing the flapper in the closing direction. Since the elastic body is integrally formed, the number of parts can be reduced and the flapper can be assembled easily. And since the elastic body is shape | molded integrally, there is no possibility that an elastic body may fall off accidentally.

本発明の逆止弁の取付位置を示す部分断面図である。It is a fragmentary sectional view which shows the attachment position of the non-return valve of this invention. 本発明の逆止弁の一実施例を示す斜視図である。It is a perspective view which shows one Example of the non-return valve of this invention. 図２の逆止弁を分解した状態を示す斜視図である。It is a perspective view which shows the state which decomposed | disassembled the non-return valve of FIG. 図２の逆止弁を後述する図６のＡ-Ａ部分に相当する箇所で切断した断面図である。It is sectional drawing which cut | disconnected the check valve of FIG. 2 in the location corresponded to the AA part of FIG. 6 mentioned later. 図２の逆止弁と給油管とを嵌め合わせる前の様子を示す底面図である。It is a bottom view which shows the mode before fitting the non-return valve and oil supply pipe | tube of FIG. 図２の逆止弁と給油管とを嵌め合わせた後の様子を示す底面図である。It is a bottom view which shows a mode after fitting the non-return valve and oil supply pipe | tube of FIG. 図６のＡ-Ａ部分で切断した断面を後方から見た斜視図である。It is the perspective view which looked at the cross section cut | disconnected by the AA part of FIG. 6 from back. 図２の逆止弁を後方から見た斜視図である。It is the perspective view which looked at the non-return valve of FIG. 2 from back. フラッパが開いた状態を示す図４相当の断面図である。FIG. 5 is a cross-sectional view corresponding to FIG. 4 showing a state in which the flapper is opened. 本発明の逆止弁の２つめの実施例を示す斜視図である。It is a perspective view which shows the 2nd Example of the non-return valve of this invention. 図１０の逆止弁を分解した状態を示す斜視図である。It is a perspective view which shows the state which decomposed | disassembled the non-return valve of FIG. 図１０の逆止弁の断面図である。図４に相当する断面を示す。It is sectional drawing of the non-return valve of FIG. 5 shows a cross section corresponding to FIG. 図１０の逆止弁を後方から見た斜視図である。It is the perspective view which looked at the non-return valve of FIG. 10 from back. フラッパが開いた状態を示す図１２相当の断面図である。It is sectional drawing equivalent to FIG. 12 which shows the state which the flapper opened. 本発明の逆止弁の３つめの実施例を示す側面図である。It is a side view which shows the 3rd Example of the non-return valve of this invention. 図１５の逆止弁を分解した状態を示す斜視図である。It is a perspective view which shows the state which decomposed | disassembled the non-return valve of FIG. 図１５のＢ-Ｂ部分で切断した断面図である。It is sectional drawing cut | disconnected by the BB part of FIG. 図８において、支持突起を環状に変更した逆止弁を後方から見た斜視図である。In FIG. 8, it is the perspective view which looked at the non-return valve which changed the support protrusion into cyclic | annular form from back. 図１１において、支持突起を環状に変更した逆止弁を前方から見た斜視図である。In FIG. 11, it is the perspective view which looked at the non-return valve which changed the support protrusion into cyclic | annular form from the front.

図面を参照しつつ本発明を実施するための形態について説明する。 DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings.

図１に、一般的な燃料タンク１（以下、単にタンクと称する）及び燃料給油管２（以下、単に給油管と称する）を示す。給油管２は、給油口側に位置する第１パイプ１１と、タンク側に位置する第２パイプ１２と、第１パイプ１１及び第２パイプ１２をつなぐフレキシブルホース１３とからなる。本発明の逆止弁は、図１においてハッチングを付した方形の部材で模式的に示したように、第１パイプ１１の先端の内側、第２パイプ１２の先端の外側若しくは内側、又は第２パイプ１２の基端の内側に嵌め込んで使用する。図１においては、給油口側から順に符号３、４、５及び６で逆止弁を示す。以下では、第２パイプ１２の先端の外側に嵌めて使用する逆止弁６（図１ないし図９）及びその変形例（図１０ないし図１４及び図１５ないし図１７）を例に挙げて説明する。図１ないし９に係る逆止弁６は、フラッパ側の嵌合部１６が軸受１７であり、ボデー側の嵌合部１４が回転軸１５である。図１０ないし１４に係る逆止弁７は、フラッパ側の嵌合部２０が回転軸２１であり、ボデー側の嵌合部１８が軸受１９である。逆止弁７は、逆止弁６と同様に第２パイプ１２の先端の外側に嵌めて使用する。図１５ないし図１７に係る逆止弁８は、フラッパ側の嵌合部２４が回転軸２５であり、ボデー側の嵌合部２２が軸受２３である。逆止弁８は、第２パイプ１２の先端側の管面の一部だけを覆う。逆止弁８は、逆止弁６と同様に第２パイプ１２の先端の外側に嵌めて使用する。 FIG. 1 shows a general fuel tank 1 (hereinafter simply referred to as a tank) and a fuel oil supply pipe 2 (hereinafter simply referred to as a fuel supply pipe). The oil supply pipe 2 includes a first pipe 11 located on the oil supply port side, a second pipe 12 located on the tank side, and a flexible hose 13 connecting the first pipe 11 and the second pipe 12. The check valve of the present invention has a hatched rectangular member in FIG. 1 and schematically shows the inside of the tip of the first pipe 11, the outside or inside of the tip of the second pipe 12, or the second It is used by being fitted inside the proximal end of the pipe 12. In FIG. 1, check valves are indicated by reference numerals 3, 4, 5 and 6 in order from the fuel filler side. In the following description, the check valve 6 (FIGS. 1 to 9) and its modified examples (FIGS. 10 to 14 and 15 to 17) used by being fitted to the outside of the tip of the second pipe 12 will be described as examples. To do. In the check valve 6 according to FIGS. 1 to 9, the fitting portion 16 on the flapper side is a bearing 17, and the fitting portion 14 on the body side is a rotating shaft 15. In the check valve 7 according to FIGS. 10 to 14, the fitting portion 20 on the flapper side is the rotating shaft 21, and the fitting portion 18 on the body side is the bearing 19. As with the check valve 6, the check valve 7 is used by being fitted to the outside of the tip of the second pipe 12. In the check valve 8 according to FIGS. 15 to 17, the fitting portion 24 on the flapper side is the rotating shaft 25, and the fitting portion 22 on the body side is the bearing 23. The check valve 8 covers only a part of the tube surface on the distal end side of the second pipe 12. As with the check valve 6, the check valve 8 is used by being fitted to the outside of the tip of the second pipe 12.

図１ないし図９の逆止弁６について説明する。この逆止弁６は、ボデー２６を第２パイプ１２の先端の外側に嵌めて使用する。図２及び図３に示したように、逆止弁６は、第２パイプ１２の先端に取り付けられるボデー２６と、ボデー２６に回転可能に支持され第２パイプ１２の開口を開閉するフラッパ２７とからなる。図３及び４に示したように、ボデー２６及びフラッパ２７は別々に成形される。この逆止弁はボデー２６とフラッパ２７の２部材から構成される。 The check valve 6 shown in FIGS. 1 to 9 will be described. This check valve 6 is used by fitting the body 26 to the outside of the tip of the second pipe 12. As shown in FIGS. 2 and 3, the check valve 6 includes a body 26 attached to the tip of the second pipe 12, and a flapper 27 that is rotatably supported by the body 26 and opens and closes the opening of the second pipe 12. Consists of. As shown in FIGS. 3 and 4, the body 26 and the flapper 27 are molded separately. This check valve is composed of two members, a body 26 and a flapper 27.

逆止弁６のボデー２６は、図３及び４に示したように筒状であり、基端及び先端に開口２８、２９を備える。ボデー２６の先端は斜めになっている。そして、図５ないし図７に示したようにボデー２６の基端側の開口２８に第２パイプ１２の先端を嵌め込んでボデー２６を第２パイプ１２の先端に固定する。 The body 26 of the check valve 6 has a cylindrical shape as shown in FIGS. 3 and 4 and has openings 28 and 29 at the proximal end and the distal end. The tip of the body 26 is slanted. Then, as shown in FIGS. 5 to 7, the distal end of the second pipe 12 is fitted into the opening 28 on the proximal end side of the body 26 to fix the body 26 to the distal end of the second pipe 12.

ボデー２６と第２パイプ１２は、ボデー２６に設けた固定部３０によって固定する。固定部３０は、図５ないし７に示したように、ボデー２６に設けられる弾性固定板３１と、該弾性固定板３１に設けられ第２パイプ１２に設けられた係合孔３２に係合する突起３３と、弾性固定板３１を取り囲む切欠部３４とからなる。ボデー２６を第２パイプ１２の先端に嵌め込む際には、弾性固定板３１が弾性変形して突起３３が第２パイプ１２の内壁に乗り上げる。そのままボデー２６を第２パイプ１２の先端に対して押し付けると、突起３３が第２パイプ１２の係合孔３２に係合して、ボデー２６及び第２パイプ１２は相互に固定される。突起３３は、第２パイプ１２と向き合う箇所に傾斜面を備えており、突起３３が第２パイプ１２の内壁に乗り上げやすい形状となっている。固定部３０もボデー２６と一体に成形することが好ましい。固定部の構成は、その他の構成としてもよい。ボデー２６の基端には、リブ３５が設けられている。リブ３５はボデー２６の周面に配置される突条であり、ボデー２６の剛性を強化する。 The body 26 and the second pipe 12 are fixed by a fixing portion 30 provided on the body 26. As shown in FIGS. 5 to 7, the fixing portion 30 engages with an elastic fixing plate 31 provided in the body 26 and an engagement hole 32 provided in the elastic fixing plate 31 and provided in the second pipe 12. It consists of a protrusion 33 and a notch 34 surrounding the elastic fixing plate 31. When the body 26 is fitted into the tip of the second pipe 12, the elastic fixing plate 31 is elastically deformed and the protrusion 33 rides on the inner wall of the second pipe 12. When the body 26 is pressed against the tip of the second pipe 12 as it is, the projection 33 engages with the engagement hole 32 of the second pipe 12, and the body 26 and the second pipe 12 are fixed to each other. The protrusion 33 has an inclined surface at a location facing the second pipe 12, and the protrusion 33 has a shape that can easily ride on the inner wall of the second pipe 12. The fixing portion 30 is also preferably formed integrally with the body 26. The configuration of the fixing unit may be other configurations. A rib 35 is provided at the base end of the body 26. The ribs 35 are protrusions arranged on the peripheral surface of the body 26 and reinforce the rigidity of the body 26.

ボデー２６は、図３及び図４に示したように、回転軸及び軸受の嵌合部１４として機能する回転軸１５と弾性体３６とを一体に成形した部材である。回転軸１５は断面が円形の軸である。回転軸１５は、支持部３７を介してボデー２６の周面に接続される。支持部３７は方形のブロックであり、その幅は回転軸１４の軸方向の長さよりも小さく構成されている。支持部３７の幅は、フラッパ２７の連結部３８に設けられた支持突起３９の内壁間の幅とほぼ同寸に構成されている（図８）。このため支持部３７の左右側壁は、フラッパ２７の回動を安定させるガイドとして機能する。弾性体３６は平面視矩形の弾性板である。弾性体３６の一端はボデー２６の基端側に接続部４０を介して接続され、その他端は自由端となっている。接続部４０は、ボデー２６の基端からボデーの軸に直行する方向に突出する。弾性体３６は、接続部４０の先端に設けられて、回転軸１５の上を通過する。弾性体３６の先端には側面視で略三角形状の押突起４１が配されている。押突起４１は、フラッパ２７が開いた際にフラッパ２７の連結部３８を押圧する。連結部３８はフラッパ２７の蓋部４２と同一な傾斜面４４を有する部分とボデー２６の軸方向に延びる部分を有している。連結部３８は、蓋部４２とボデー２６をつなぐヒンジとして機能する。 As shown in FIGS. 3 and 4, the body 26 is a member in which the rotating shaft 15 that functions as the rotating shaft and the fitting portion 14 of the bearing and the elastic body 36 are integrally formed. The rotating shaft 15 is an axis having a circular cross section. The rotating shaft 15 is connected to the peripheral surface of the body 26 via a support portion 37. The support portion 37 is a rectangular block, and the width thereof is configured to be smaller than the axial length of the rotating shaft 14. The width of the support portion 37 is configured to be approximately the same as the width between the inner walls of the support protrusions 39 provided on the connecting portion 38 of the flapper 27 (FIG. 8). For this reason, the left and right side walls of the support portion 37 function as a guide for stabilizing the rotation of the flapper 27. The elastic body 36 is an elastic plate having a rectangular shape in plan view. One end of the elastic body 36 is connected to the base end side of the body 26 via the connecting portion 40, and the other end is a free end. The connecting portion 40 protrudes from the base end of the body 26 in a direction perpendicular to the body axis. The elastic body 36 is provided at the tip of the connection portion 40 and passes over the rotary shaft 15. A substantially triangular push protrusion 41 is disposed at the tip of the elastic body 36 in a side view. The push protrusion 41 presses the connecting portion 38 of the flapper 27 when the flapper 27 is opened. The connecting portion 38 has a portion having the same inclined surface 44 as the lid portion 42 of the flapper 27 and a portion extending in the axial direction of the body 26. The connecting portion 38 functions as a hinge that connects the lid portion 42 and the body 26.

フラッパ２７は、図８及び９に示したように、ボデー２６に回転可能に支持されて、第２パイプ１２の先端の開口を開閉する。図４にハッチングを付して示したように、本実施例の逆止弁６のフラッパ２７は、第２パイプ１２の先端の開口を開閉する蓋部４２と、連結部３８と、回転軸及び軸受の嵌合部１６として機能する軸受１７とを一体に成形した部材である。フラッパ２７とボデー２６を組み付けた状態において、連結部３８の傾斜面４４に弾性体３６の押突起４１が被さるように位置する。軸受１７は連結部３８の端部から突出する支持突起３９から構成される。本実施例では、図８に示したように、連結部３８の端部に上下から回転軸１５を抱えるように２つ一組の支持突起３９を２組設けている。すなわち、支持突起３９の数は４個である。上側の支持突起３９を連結して、支持突起の数を３個としてもよい。複数の支持突起３９は、軸受１７を構成し、軸受１７の軸受入方向に対して回転軸１５を押し付けた際に弾性変形して回転軸１５を回転可能に受け入れる。そして複数の支持突起３９は、元の形状に復帰して回転軸１５の脱落を防止する。側面視において、回転軸１５の軸棒の円周の半分を超える部分が支持突起３９で覆われるようにすることで、軸受１７の脱落が防止できる。このとき、支持突起３９の間に切り欠き４３を設定すると、回転軸１５に対して切り欠き４３を押し付けることで、支持突起３９が弾性変形して回転軸１５を嵌合する。支持突起３９が元の形状に復帰して軸受１７（フラッパ２７）の脱落を防止することができる。このように、本実施例の逆止弁６では、切り欠き４３を回転軸１５に対して押し付けることで軸受１７に回転軸１５を簡単にはめ込むことができる。図１８に示したように、支持突起６３が軸棒の全周を覆うようにすることもできる。つまり、支持突起６３を環状にすることもできる。この場合は、支持突起６３を回転軸１５の軸方向に弾性変形させて、環状の軸受に回転軸１５を差し込むことで、回転軸１５と軸受１７を嵌め合わせることができる。 As shown in FIGS. 8 and 9, the flapper 27 is rotatably supported by the body 26 to open and close the opening at the tip of the second pipe 12. As shown in FIG. 4 with hatching, the flapper 27 of the check valve 6 of this embodiment includes a lid portion 42 that opens and closes the opening at the tip of the second pipe 12, a connecting portion 38, a rotating shaft, This is a member formed integrally with a bearing 17 that functions as the fitting portion 16 of the bearing. In the state where the flapper 27 and the body 26 are assembled, the pusher 41 of the elastic body 36 is positioned so as to cover the inclined surface 44 of the connecting portion 38. The bearing 17 includes a support protrusion 39 that protrudes from the end of the connecting portion 38. In this embodiment, as shown in FIG. 8, two sets of support protrusions 39 are provided in pairs so as to hold the rotary shaft 15 from above and below at the end of the connecting portion 38. That is, the number of support protrusions 39 is four. The upper support protrusions 39 may be connected so that the number of support protrusions is three. The plurality of support protrusions 39 constitute the bearing 17 and elastically deform when the rotating shaft 15 is pressed against the bearing insertion direction of the bearing 17 to receive the rotating shaft 15 rotatably. The plurality of support protrusions 39 return to the original shape and prevent the rotary shaft 15 from falling off. In a side view, the bearing 17 can be prevented from falling off by covering a portion exceeding half of the circumference of the shaft rod of the rotary shaft 15 with the support protrusion 39. At this time, if the notch 43 is set between the support protrusions 39, the support protrusion 39 is elastically deformed by fitting the rotation shaft 15 by pressing the notch 43 against the rotation shaft 15. The support protrusion 39 returns to its original shape, and the bearing 17 (flapper 27) can be prevented from falling off. Thus, in the check valve 6 of the present embodiment, the rotary shaft 15 can be easily fitted into the bearing 17 by pressing the notch 43 against the rotary shaft 15. As shown in FIG. 18, the support protrusion 63 may cover the entire circumference of the shaft rod. That is, the support protrusion 63 can be annular. In this case, the rotation shaft 15 and the bearing 17 can be fitted together by elastically deforming the support protrusion 63 in the axial direction of the rotation shaft 15 and inserting the rotation shaft 15 into an annular bearing.

上述のように、連結部３８の傾斜面４４に弾性体３６の押突起４１が被さるように位置する（図２及び図４）。ボデー側の嵌合部１４（本実施例では回転軸１５）とフラッパ側の嵌合部１６（本実施例では軸受１７）とを嵌め合わせた状態において、フラッパ２７が開く際の回転軌跡上に弾性体３６の自由端が配置されているので、フラッパ２７が開くとフラッパ２７を閉じようとする力が働く。そして、自由端には押突起４１が設けられており、連結部３８の傾斜面４４に弾性体３６の押突起４１が被さるように位置する。図９に示したように、傾斜面４４はフラッパ２７の蓋部４２が開くと一体に傾く。給油完了し燃料の流入がなくなった後は、押突起４１がフラッパ２７の傾斜面４４を押圧してフラッパ２７が速やかに閉じる。 As described above, the pusher 41 of the elastic body 36 is positioned so as to cover the inclined surface 44 of the connecting portion 38 (FIGS. 2 and 4). In a state where the fitting portion 14 on the body side (rotating shaft 15 in this embodiment) and the fitting portion 16 on the flapper side (bearing 17 in this embodiment) are fitted together, the rotation locus is on the rotation locus when the flapper 27 is opened. Since the free end of the elastic body 36 is disposed, when the flapper 27 is opened, a force for closing the flapper 27 is applied. A push protrusion 41 is provided at the free end, and the push protrusion 41 of the elastic body 36 is positioned on the inclined surface 44 of the connecting portion 38. As shown in FIG. 9, the inclined surface 44 is integrally inclined when the lid portion 42 of the flapper 27 is opened. After the refueling is completed and the fuel does not flow, the push protrusion 41 presses the inclined surface 44 of the flapper 27, and the flapper 27 is quickly closed.

逆止弁６は、ガソリン又は軽油に接触することから、耐油性を備える材料で構成する。逆止弁６を図１の符号５又は６の位置、すなわちタンク１内に設置する場合は、耐油性及び耐熱性を備える材料を使用することが好ましい。タンク１を金属材料で成形する場合は防錆塗料を塗装するが、粉体塗装による熱（例えば、１２０〜１８０℃で２０から３０分）によって逆止弁５、６が変形することがあるからである。耐油性を備える材料としては、ポリアセタール、高密度ポリエチレン、又はナイロン等のプラスチック材料が挙げられる。耐油性及び耐熱性を備える材料としては、ポリアセタール、高密度ポリエチレン、又はナイロン等の合成樹脂に強化繊維を配合した繊維強化プラスチックが挙げられる。強化繊維としては、ガラス繊維又は炭素繊維等が挙げられる。図１ないし９の逆止弁６には、ボデー２６及びフラッパ２７共にガラス繊維強化ナイロンを使用した。ガラス繊維強化ナイロンは硬い素材ではあるが、弾性体３６の長さや厚みを変更することより弾性体３６に適度な弾性を持たせることが可能である。すなわち、本発明の逆止弁は、耐熱性を発揮するのに必要な硬さとフラッパを閉じるための弾性とを両立することができる。 Since the check valve 6 is in contact with gasoline or light oil, it is made of a material having oil resistance. When the check valve 6 is installed at the position 5 or 6 in FIG. 1, that is, in the tank 1, it is preferable to use a material having oil resistance and heat resistance. When the tank 1 is formed of a metal material, a rust preventive paint is applied. However, the check valves 5 and 6 may be deformed by heat (for example, 120 to 180 ° C. for 20 to 30 minutes) due to powder coating. It is. Examples of the material having oil resistance include plastic materials such as polyacetal, high-density polyethylene, and nylon. Examples of the material having oil resistance and heat resistance include fiber reinforced plastic obtained by blending reinforced fibers with synthetic resin such as polyacetal, high density polyethylene, or nylon. Examples of the reinforcing fiber include glass fiber or carbon fiber. The check valve 6 shown in FIGS. 1 to 9 is made of glass fiber reinforced nylon for both the body 26 and the flapper 27. Although glass fiber reinforced nylon is a hard material, it is possible to give the elastic body 36 appropriate elasticity by changing the length and thickness of the elastic body 36. That is, the check valve of the present invention can achieve both the hardness necessary for exhibiting heat resistance and the elasticity for closing the flapper.

図９に示したように、ボデー２６の基端側の開口２８から燃料が流入すると、燃料の圧力によってフラッパ２７が矢印方向に押し開かれる。燃料の流入が停止すると、図４に示したように、弾性体３６の弾性によりフラッパ２７は元の位置に戻る。燃料が逆流した場合は、ボデー２６の先端側から燃料が先端側の開口２９からボデー内に流入しようとするが、フラッパ２７は弾性体３６の押突起４１によって押圧されて閉じているため燃料の逆流は遮断される。 As shown in FIG. 9, when fuel flows in from the opening 28 on the base end side of the body 26, the flapper 27 is pushed open in the direction of the arrow by the pressure of the fuel. When the inflow of the fuel is stopped, the flapper 27 returns to the original position by the elasticity of the elastic body 36 as shown in FIG. When the fuel flows backward, the fuel tries to flow into the body from the opening 29 on the front end side of the body 26, but the flapper 27 is pressed and closed by the push protrusion 41 of the elastic body 36, so Backflow is blocked.

図１０ないし１４に示した変形例について説明する。本実施例の逆止弁７は、逆止弁６と比較して回転軸及び軸受の嵌合部においてのみ相違する。逆止弁６と逆止弁７とにおいて共通する部材に関しては、図面中で同一の符号を使用する。具体的には、図１１に示したように、逆止弁７においては、ボデー２６の周面に軸受１９（嵌合部１８）を設け、フラッパ２７に回転軸２１（嵌合部２０）を設ける。軸受１９は、支持部４５を介してボデー２６の周面に接続される。支持部４５は方形のブロックであり、その幅は軸受１９の幅と同一である。支持部４５及び軸受１９の幅は、フラッパ２７の連結部３８に設けられた突板４６の内壁間の幅とほぼ同寸に構成されている（図１３）。突板４６は、連結部３８の左右の端部に一対の関係で設けられ、ボデー２６の基端に向かって突出する。支持部４５の左右側壁には、突板４６の内壁が接触する。このため、突板４６と支持部４５は、回動方向を安定させるガイドとして機能する。 The modification shown in FIGS. 10 to 14 will be described. The check valve 7 of the present embodiment is different from the check valve 6 only in the fitting portion of the rotating shaft and the bearing. The same reference numerals are used in the drawings for members common to the check valve 6 and the check valve 7. Specifically, as shown in FIG. 11, in the check valve 7, a bearing 19 (fitting part 18) is provided on the peripheral surface of the body 26, and the rotary shaft 21 (fitting part 20) is attached to the flapper 27. Provide. The bearing 19 is connected to the peripheral surface of the body 26 via the support portion 45. The support portion 45 is a rectangular block, and the width thereof is the same as the width of the bearing 19. The widths of the support portion 45 and the bearing 19 are configured to be approximately the same as the width between the inner walls of the protruding plate 46 provided at the connecting portion 38 of the flapper 27 (FIG. 13). The protruding plates 46 are provided in a pair of relations at the left and right ends of the connecting portion 38 and protrude toward the base end of the body 26. The inner wall of the protruding plate 46 is in contact with the left and right side walls of the support portion 45. For this reason, the protruding plate 46 and the support portion 45 function as a guide that stabilizes the rotation direction.

図１１及び図１２に示したように、軸受１９は支持部４５の上端から突出する支持突起４７から構成される。本実施例では、ボデー２６の基端側から回転軸２１を抱えるように支持突起４７を１つ設けている。複数の支持突起を幅方向に分けて配置してもよい。支持突起４７は、軸受１９を構成する。軸受１９の軸受入方向に対して回転軸２１を押し付けた際に弾性変形して回転軸２１を回転可能に受け入れる。そして支持突起４７は、元の形状に復帰して回転軸２１の脱落を防止する。側面視において、回転軸２１の軸棒の円周の半分を超える部分が支持突起４７で覆われるようにすることで、回転軸２１の脱落が防止できる。このとき、支持突起４７の間に切り欠き４８を設定すると、支持突起４７の切り欠き４８に対して回転軸２１を押し付けることで、支持突起４７が弾性変形して回転軸２１を嵌合させることができる。嵌合後は支持突起４７が元の形状に復帰して回転軸２１（フラッパ２７）の脱落を防止することができる。このように、本実施例の逆止弁７では、回転軸２１を切り欠き４８に対して押し付けることで軸受１９に回転軸２１を簡単にはめ込むことができる。図１９に示したように、支持突起６４が軸棒の全周を覆うようにすることもできる。つまり、支持突起６４を環状にすることもできる。この場合は、回転軸２１の軸方向に回転軸２１を接続した突板４６を弾性変形させて、回転軸２１を環状の軸受１９に差し込むことで、回転軸２１と軸受１９とを嵌め合わせることができる。 As shown in FIGS. 11 and 12, the bearing 19 includes a support protrusion 47 that protrudes from the upper end of the support portion 45. In the present embodiment, one support protrusion 47 is provided so as to hold the rotating shaft 21 from the base end side of the body 26. A plurality of support protrusions may be arranged separately in the width direction. The support protrusion 47 constitutes the bearing 19. When the rotary shaft 21 is pressed against the bearing insertion direction of the bearing 19, the rotary shaft 21 is rotatably received by elastic deformation. And the support protrusion 47 returns to the original shape and prevents the rotating shaft 21 from falling off. In a side view, by allowing the support protrusion 47 to cover a portion that exceeds half the circumference of the shaft rod of the rotating shaft 21, it is possible to prevent the rotating shaft 21 from falling off. At this time, if the notch 48 is set between the support protrusions 47, the support protrusion 47 is elastically deformed and the rotation shaft 21 is fitted by pressing the rotation shaft 21 against the notch 48 of the support protrusion 47. Can do. After the fitting, the support protrusion 47 returns to the original shape, and the rotation shaft 21 (the flapper 27) can be prevented from falling off. Thus, in the check valve 7 of this embodiment, the rotary shaft 21 can be easily fitted into the bearing 19 by pressing the rotary shaft 21 against the notch 48. As shown in FIG. 19, the support protrusion 64 may cover the entire circumference of the shaft rod. That is, the support protrusion 64 can be annular. In this case, the rotating shaft 21 and the bearing 19 can be fitted together by elastically deforming the protruding plate 46 connecting the rotating shaft 21 in the axial direction of the rotating shaft 21 and inserting the rotating shaft 21 into the annular bearing 19. it can.

逆止弁７の回転軸２１は、一対の円柱状突起（図１１参照）である。つまり、回転軸は、一本の連続する軸棒ではなく、軸方向の中ほどで途切れる。回転軸２１は、フラッパ２７の連結部３８の端部に設けられる突板４６の内側に設けられる。回転軸は一本の連続する棒体として構成しても構わない。ただし、上述のように軸受を環状にするときは、回転軸が軸方向に弾性変形できるように一対の円柱状突起にしなければならない。 The rotating shaft 21 of the check valve 7 is a pair of cylindrical protrusions (see FIG. 11). That is, the rotation shaft is not a single continuous shaft rod, but is interrupted in the middle of the axial direction. The rotating shaft 21 is provided inside a protruding plate 46 provided at the end of the connecting portion 38 of the flapper 27. The rotating shaft may be configured as a single continuous rod. However, when the bearing is annular as described above, the pair of columnar protrusions must be formed so that the rotating shaft can be elastically deformed in the axial direction.

図１５ないし１７に示した変形例について説明する。逆止弁６と逆止弁７と逆止弁８とにおいて共通する部材に関しては、図面中で同一の符号を使用する。図１ないし９及び図１０ないし１４に示した逆止弁６、７は、ボデーを筒状にしたものである。ボデーの形状は筒状に限られず、図１５ないし図１７に示したように、第２パイプ１２の周面の一部を覆う形状としてもよい。本実施例の逆止弁８のボデー４９については、支持突起６２からなる軸受２３と、一端がボデー４９の基端に接続され他端が自由端である弾性体３６とを一体に成形した点では逆止弁７と同じである。また、フラッパ５０の蓋部５１と、フラッパ側の嵌合部２４として機能する回転軸２５とを一体に成形した点でも逆止弁８と同じである。回転軸２５は、左右一対の突板６１から突出する。突板６１は、フラッパの連結部５７からボデー４９の基端側に突出する。ボデー４９側の嵌合部２２である軸受２３は、１つの支持突起６２から構成される。支持突起６２は、切り欠き６０を有する。切り欠き６０の機能は切り欠き４８と同じである。支持突起６２の幅は、一対の突板６１の内壁間の寸法とほぼ同じである。支持突起６２はフラッパ５０のガイドとして機能する。以上のように、回転軸２５及び軸受２３の関係は、逆止弁７と大きくは変わらない。 The modification shown in FIGS. 15 to 17 will be described. The same reference numerals are used in the drawings for members common to the check valve 6, the check valve 7, and the check valve 8. The check valves 6 and 7 shown in FIGS. 1 to 9 and FIGS. 10 to 14 have a cylindrical body. The shape of the body is not limited to a cylindrical shape, and may be a shape that covers a part of the peripheral surface of the second pipe 12 as shown in FIGS. 15 to 17. Regarding the body 49 of the check valve 8 of this embodiment, the bearing 23 formed of the support protrusion 62 and the elastic body 36 having one end connected to the base end of the body 49 and the other end being a free end are integrally formed. Then, it is the same as the check valve 7. Further, it is the same as the check valve 8 in that the lid portion 51 of the flapper 50 and the rotating shaft 25 functioning as the fitting portion 24 on the flapper side are integrally formed. The rotating shaft 25 protrudes from a pair of left and right protruding plates 61. The protruding plate 61 protrudes from the connecting portion 57 of the flapper to the base end side of the body 49. The bearing 23, which is the fitting portion 22 on the body 49 side, includes a single support protrusion 62. The support protrusion 62 has a notch 60. The function of the notch 60 is the same as that of the notch 48. The width of the support protrusion 62 is substantially the same as the dimension between the inner walls of the pair of protrusions 61. The support protrusion 62 functions as a guide for the flapper 50. As described above, the relationship between the rotary shaft 25 and the bearing 23 is not significantly different from that of the check valve 7.

しかし、本実施例の逆止弁８は、ブロック５２から左右に延びる一対のアーム５３とアーム５３の先端に設けられる係合爪５４とからなる固定部５５を備える点で逆止弁７とは相違する。ブロック５２、アーム５３、及び係合爪５４は、ボデー４９と一体に成形される。図１７の断面図に示したように、係合爪５４は第２パイプ１２に設けた係合孔５６に係合して、ボデー４９を第２パイプ１２に固定する。また、本実施例の逆止弁８のフラッパ５０の蓋部５１は第２パイプ１２に対して略垂直となっている点でも相違する。さらに、連結部５７の構造も相違している。連結部５７は、第２パイプ１２の軸方向に直行する直行面５８と軸方向に平行な平行面５９とを有する。弾性体３６の自由端は押突起４１を有する。フラッパ５０が開方向に回動すると、平行面５９が押突起４１に押される。逆止弁８は、ボデー４９の基端側から燃料の流入があると図１４と同様に開いて、燃料の通過を許す。燃料が逆流したときはフラッパ５０が弾性体３６で閉じられているので、燃料の逆流を遮断する。 However, the check valve 8 of this embodiment is different from the check valve 7 in that it includes a fixing portion 55 including a pair of arms 53 extending from the block 52 to the left and right and an engagement claw 54 provided at the tip of the arm 53. Is different. The block 52, the arm 53, and the engaging claw 54 are formed integrally with the body 49. As shown in the sectional view of FIG. 17, the engaging claw 54 engages with the engaging hole 56 provided in the second pipe 12 to fix the body 49 to the second pipe 12. Further, the lid 51 of the flapper 50 of the check valve 8 of the present embodiment is also different in that it is substantially perpendicular to the second pipe 12. Furthermore, the structure of the connecting portion 57 is also different. The connecting portion 57 has a perpendicular surface 58 that is perpendicular to the axial direction of the second pipe 12 and a parallel surface 59 that is parallel to the axial direction. The free end of the elastic body 36 has a push projection 41. When the flapper 50 rotates in the opening direction, the parallel surface 59 is pushed by the push protrusion 41. When there is an inflow of fuel from the base end side of the body 49, the check valve 8 opens as in FIG. When the fuel flows backward, since the flapper 50 is closed by the elastic body 36, the fuel backward flow is blocked.

以上のように、本発明の逆止弁では弾性体３６をボデー２６、４９と一体に構成しているので、弾性体が脱落するおそれがない。ボデー２６、４９とフラッパ２７、５０は嵌合部で嵌め合わせているので、燃料の流入等によって誤ってフラッパ２７、５０が脱落するおそれもない。軸と軸受の嵌合することでフラッパ２７、５０とボデー２６、４９との組み付けるので、組み付け作業も簡単である。 As described above, in the check valve according to the present invention, since the elastic body 36 is integrally formed with the bodies 26 and 49, there is no possibility that the elastic body falls off. Since the bodies 26 and 49 and the flappers 27 and 50 are fitted together at the fitting portion, there is no possibility that the flappers 27 and 50 are accidentally dropped due to inflow of fuel or the like. Since the flappers 27 and 50 and the bodies 26 and 49 are assembled by fitting the shaft and the bearing, the assembling work is also easy.

１ タンク
２ 給油管
６ 逆止弁（第１実施例）
７ 逆止弁（第２実施例）
８ 逆止弁（第３実施例）
１１ 第１パイプ
１２ 第２パイプ
１３ フレキシブルホース
１４ 嵌合部（第１実施例）
１５ 回転軸（第１実施例）
１６ 嵌合部（第１実施例）
１７ 軸受（第１実施例）
１８ 嵌合部（第２実施例）
１９ 回転軸（第２実施例）
２０ 嵌合部（第２実施例）
２１ 軸受（第２実施例）
２２ 嵌合部（第３実施例）
２３ 回転軸（第３実施例）
２４ 嵌合部（第３実施例）
２５ 軸受（第３実施例）
２６ ボデー
２７ フラッパ
３６ 弾性体
３７ 支持部（第１実施例）
３８ 連結部
３９ 支持突起（第１実施例）
４０ 接続部
４１ 押突起
４２ 蓋部
４３ 切り欠き
４４ 傾斜面
４５ 支持部（第２実施例）
４６ 突板
４７ 支持突起（第２実施例）
４８ 切り欠き（第２実施例）
４９ ボデー（第３実施例）
５０ フラッパ（第３実施例）
５１ 蓋部（第３実施例）
５３ アーム
５４ 係合爪
５６ 係合孔
５７ 連結部
６０ 切り欠き
６１ 突板
６２ 支持突起1 Tank 2 Oil Supply Pipe 6 Check Valve (First Example)
7 Check valve (second embodiment)
8 Check valve (Third embodiment)
11 1st pipe 12 2nd pipe 13 Flexible hose 14 Fitting part (1st Example)
15 Rotating shaft (first embodiment)
16 Fitting part (first embodiment)
17 Bearing (first embodiment)
18 Fitting part (second embodiment)
19 Rotating shaft (second embodiment)
20 Fitting part (second embodiment)
21 Bearing (second embodiment)
22 Fitting part (3rd Example)
23 Rotating shaft (Third embodiment)
24 fitting part (3rd Example)
25 Bearing (Third embodiment)
26 Body 27 Flapper 36 Elastic body 37 Supporting part (first embodiment)
38 connecting portion 39 support protrusion (first embodiment)
40 connecting portion 41 pushing projection 42 lid portion 43 notch 44 inclined surface 45 support portion (second embodiment)
46 Projection plate 47 Support projection (second embodiment)
48 Notch (second embodiment)
49 Body (Third Example)
50 Flapper (Third embodiment)
51 Lid (Third Example)
53 Arm 54 Engagement Claw 56 Engagement Hole 57 Connection Portion 60 Notch 61 Projection Plate 62 Support Protrusion

Claims (9)

給油管に対して直接に取り付けられるボデーと、
ボデーに対して回転可能に取り付けることで給油管の開口を開閉するフラッパとからなり、
ボデーは、回転軸及び軸受の嵌合部と、一端がボデーに接続され他端が自由端でありフラッパを閉方向に押える弾性体と、ボデーとを一体に成形した部材であり、
フラッパは、給油管の開口を開閉する蓋部と、回転軸及び軸受の嵌合部とを備える部材であり、
ボデー側の嵌合部とフラッパ側の嵌合部とを嵌め合わせた状態において、フラッパが開く際の回転軌跡上に弾性体の自由端が配置されており、
ボデー側の嵌合部とフラッパ側の嵌合部とを嵌め合わせることでフラッパはボデーに対して回転可能に組み付けられ、フラッパを開方向に回動した状態において弾性体はフラッパを閉方向に押圧する燃料給油管の逆止弁。 A body that is directly attached to the oil supply pipe;
It consists of a flapper that opens and closes the opening of the oiling pipe by attaching it rotatably to the body,
Body includes a fitting portion of the rotary shaft and the bearing, and an elastic body for pressing the one end is the free end and the other end is connected to the vehicle body flapper in the closing direction, a member formed integrally with the body,
The flapper is a member that includes a lid part that opens and closes the opening of the oil supply pipe, and a fitting part of the rotary shaft and the bearing.
In the state where the fitting part on the body side and the fitting part on the flapper side are fitted together, the free end of the elastic body is arranged on the rotation locus when the flapper opens,
By fitting the fitting part on the body side and the fitting part on the flapper side, the flapper is rotatably assembled to the body, and the elastic body presses the flapper in the closing direction when the flapper is rotated in the opening direction. Check valve for fuel supply pipe. フラッパは、蓋部とフラッパ側の嵌合部とを一体に成形した部材である請求項１に記載の燃料給油管の逆止弁。 The check valve for a fuel supply pipe according to claim 1, wherein the flapper is a member formed by integrally forming a lid portion and a fitting portion on the flapper side. 弾性体は、回転軸及び軸受の嵌合部の上を通過する形状である請求項１又は２に記載の燃料給油管の逆止弁。The check valve of the fuel supply pipe according to claim 1 or 2, wherein the elastic body has a shape that passes over the rotating shaft and the fitting portion of the bearing. 弾性体の自由端は、フラッパを押圧する押突起を備える請求項１ないし３のいずれかに記載の燃料給油管の逆止弁。 The check valve of the fuel supply pipe according to any one of claims 1 to 3, wherein the free end of the elastic body includes a push projection that presses the flapper. ボデー及びフラッパは、耐油性の繊維強化プラスチックから構成される請求項１ないし４のいずれかに記載の燃料給油管の逆止弁。 The check valve of the fuel supply pipe according to any one of claims 1 to 4, wherein the body and the flapper are made of an oil-resistant fiber-reinforced plastic. ボデー側の嵌合部は軸受であり、フラッパ側の嵌合部は回転軸である請求項１ないし５のいずれかに記載の燃料給油管の逆止弁。 6. The check valve for a fuel supply pipe according to claim 1, wherein the fitting part on the body side is a bearing, and the fitting part on the flapper side is a rotating shaft. ボデー側の嵌合部は回転軸であり、フラッパ側の嵌合部は軸受である請求項１ないし５のいずれかに記載の燃料給油管の逆止弁。 6. The check valve for a fuel supply pipe according to claim 1, wherein the fitting portion on the body side is a rotating shaft, and the fitting portion on the flapper side is a bearing. 軸受は切り欠きを有しており、
軸受の切り欠きに対して回転軸を押し付けると、
軸受が、弾性変形して回転軸を回転可能に嵌合し、元の形状に復帰して回転軸の脱落を防止する請求項６又は７に記載の燃料給油管の逆止弁。 The bearing has a notch,
When the rotating shaft is pressed against the notch of the bearing,
The check valve of the fuel supply pipe according to claim 6 or 7, wherein the bearing is elastically deformed so that the rotating shaft is rotatably fitted and returned to its original shape to prevent the rotating shaft from dropping off. 軸受は環状であり、
軸受を構成する支持突起又は回転軸が接続される突板を弾性変形させて、回転軸を軸受に回転可能に嵌合させる請求項６又は７に記載の燃料給油管の逆止弁。 The bearing is annular,
The check valve for a fuel supply pipe according to claim 6 or 7, wherein a support protrusion or a projecting plate connected to a rotating shaft is elastically deformed and the rotating shaft is rotatably fitted to the bearing.
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