JP2013100740A - Support structure of fuel injection valve - Google Patents

Support structure of fuel injection valve Download PDF

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JP2013100740A
JP2013100740A JP2011243821A JP2011243821A JP2013100740A JP 2013100740 A JP2013100740 A JP 2013100740A JP 2011243821 A JP2011243821 A JP 2011243821A JP 2011243821 A JP2011243821 A JP 2011243821A JP 2013100740 A JP2013100740 A JP 2013100740A
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fuel injection
injection valve
fuel
supply cap
ring
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Kenichi Saito
健一 斎藤
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Keihin Corp
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Keihin Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a support structure of a fuel injection valve that can inspect whether any O-ring might be left unmounted or any damage of the O-ring might be present, being caused by force feed of air to a fuel supply cap, and can prevent ingress of cleaning water, dust or the like in the fuel supply cap.SOLUTION: In the support structure of the fuel injection valve, a fuel injection part 5 is fitted to a fitting hole 2 of an engine, a fuel supply cap is fitted to an outer circumference of a fuel inlet cylindrical part 6, an O-ring 8 is tightly attached to an inner peripheral surface of the fuel supply cap 20, and a cushion ring 17 is pressed against the fitting hole 2 side at a front end face of the fuel supply cap 20 to support a fuel injection valve I. A one-direction seal part 31 can performing the pressure shift only in one direction from the inner side of the fuel supply cap 20 to the outer side of the cushion ring 17 is formed at least on one part of the cushion ring 17.

Description

本発明は,前端に燃料噴射部,後端に燃料入口筒部,中間部に後向きの環状肩部を有する燃料噴射弁の支持構造に関し,特に,前記燃料入口筒部の外周にOリングを装着し,前記環状肩部に,前記燃料入口筒部の外周に嵌合するクッションリングを当接配置し,前記燃料噴射部をエンジンの取り付け孔に嵌装すると共に,前記燃料入口筒部の外周に燃料供給キャップを嵌装し,この燃料供給キャップの内周面に前記Oリングを密接させると共に,この燃料供給キャップの前端面で前記クッションリングを前記取り付け孔側に押圧して燃料噴射弁を支持するようにした,燃料噴射弁の支持構造の改良に関する。   The present invention relates to a support structure for a fuel injection valve having a fuel injection portion at a front end, a fuel inlet tube portion at a rear end, and a rearward annular shoulder portion at an intermediate portion, and in particular, an O-ring is mounted on the outer periphery of the fuel inlet tube portion. A cushion ring that fits around the outer periphery of the fuel inlet cylinder is disposed in contact with the annular shoulder, and the fuel injection part is fitted into the mounting hole of the engine, and the outer periphery of the fuel inlet cylinder is A fuel supply cap is fitted, and the O-ring is brought into close contact with the inner peripheral surface of the fuel supply cap, and the fuel injection valve is supported by pressing the cushion ring toward the mounting hole on the front end surface of the fuel supply cap. The present invention relates to an improvement in the support structure of the fuel injection valve.

かゝる燃料噴射弁の支持構造は,例えば下記特許文献1に開示されるように知られている。   Such a fuel injection valve support structure is known, for example, as disclosed in Patent Document 1 below.

実公昭55−26530号公報Japanese Utility Model Publication Sho 55-26530

従来,かゝる燃料噴射弁の支持構造では,その組立後,燃料入口筒部へのOリングの装着忘れやそのOリングの損傷の有無を検査するために,予めクッションリングと燃料供給キャップとの当接面に通気溝を設けておき,組立後,燃料供給キャップに空気を圧送したとき,上記通気溝からの空気の流出の有無をチェックし,その空気の流出時には,前記Oリングの装着忘れ又はそのOリングに損傷があると判定し,再組立を行うようにしている。   Conventionally, in such a fuel injection valve support structure, after assembling, in order to forget to attach the O-ring to the fuel inlet cylinder and to check whether the O-ring is damaged, A vent groove is provided on the abutment surface, and after assembly, when air is pumped to the fuel supply cap, it is checked whether there is any air outflow from the vent groove. It is determined that the O-ring has been forgotten or damaged, and reassembly is performed.

しかしながら,こうした燃料噴射弁の支持構造では,使用状態において,洗浄水やダスト等が前記通気溝を通過して前記Oリングに付着し,それを汚損する可能性がある。   However, in such a support structure of the fuel injection valve, there is a possibility that cleaning water, dust or the like passes through the ventilation groove and adheres to the O-ring in a use state, thereby fouling it.

本発明は,かゝる事情に鑑みてなされたもので,上記のような通気溝を設けずとも,組立後,燃料供給キャップへの空気の圧送による前記Oリングの装着忘れやそのOリングの損傷の有無の検査を可能にすると共に,洗浄水やダスト等の燃料供給キャップへの侵入を防ぐことができる前記燃料噴射弁の支持構造を提供することを目的とする。   The present invention has been made in view of such circumstances. Forgetting to install the O-ring by assembling the O-ring by pumping air to the fuel supply cap after assembly without providing the vent groove as described above. An object of the present invention is to provide a support structure for the fuel injection valve that enables inspection of damage and prevents intrusion of cleaning water, dust, or the like into the fuel supply cap.

上記目的を達成するために,本発明は,前端に燃料噴射部,後端に燃料入口筒部,中間部に後向きの環状肩部を有する燃料噴射弁の支持構造であって,前記燃料入口筒部の外周にOリングを装着し,前記環状肩部に,前記燃料入口筒部の外周に嵌合するクッションリングを当接配置し,前記燃料噴射部をエンジンの取り付け孔に嵌装すると共に,前記燃料入口筒部の外周に燃料供給キャップを嵌装し,この燃料供給キャップの内周面に前記Oリングを密接させると共に,この燃料供給キャップの前端面で前記クッションリングを前記取り付け孔側に押圧して燃料噴射弁を支持するようにしたものにおいて,前記クッションリングの少なくとも一部に,前記燃料供給キャップ内から該クッションリング外への一方向のみの圧力移動を可能とする一方向シール部を形成したことを第1の特徴とする。尚,前記環状肩部は,後述する本発明の実施形態中の後方肩部16に対応する。   In order to achieve the above object, the present invention provides a support structure for a fuel injection valve having a fuel injection portion at a front end, a fuel inlet tube portion at a rear end, and a rearward annular shoulder portion at an intermediate portion. An O-ring is attached to the outer periphery of the part, a cushion ring that fits to the outer periphery of the fuel inlet tube part is abutted on the annular shoulder, and the fuel injection part is fitted into the mounting hole of the engine. A fuel supply cap is fitted on the outer periphery of the fuel inlet cylinder, the O-ring is brought into close contact with the inner peripheral surface of the fuel supply cap, and the cushion ring is placed on the mounting hole side on the front end surface of the fuel supply cap. In the structure that supports the fuel injection valve by pressing, at least a part of the cushion ring can be moved in one direction of pressure from the inside of the fuel supply cap to the outside of the cushion ring. The first, characterized in that the formation of the direction seal part. In addition, the said annular shoulder part respond | corresponds to the back shoulder part 16 in embodiment of this invention mentioned later.

また本発明は,第1の特徴に加えて,前記クッションリングを,優弧状をなして前記環状肩部及び前記燃料供給キャップ間の挟持力を支承するクッション部と,劣弧状をなして前記クッション部の両周端間を一体に連結する前記一方向シール部とで構成したことを第2の特徴とする。   According to the present invention, in addition to the first feature, the cushion ring includes a cushion portion that forms a superior arc shape and supports a clamping force between the annular shoulder portion and the fuel supply cap, and an inferior arc shape that forms the cushion ring. A second feature is that the one-way seal portion integrally connects the two peripheral ends of the portion.

さらに本発明は,第2の特徴に加えて,前記一方向シール部を,前記クッション部と共に前記燃料入口筒部の外周に嵌合し且つ前記環状肩部に当接するシール基部と,このシール基部の後端から後方に向かい拡径するように突出して前記燃料供給キャップの前端面に密接するシールリップとで構成し,そのシールリップが前記シール基部を支点として外側方へ撓むことで前記燃料供給キャップ内の圧力を外部に解放するようにしたことを第3の特徴とする。   In addition to the second feature of the present invention, the one-way seal portion is fitted to the outer periphery of the fuel inlet tube portion together with the cushion portion, and is in contact with the annular shoulder portion, and the seal base portion A seal lip that protrudes from the rear end of the fuel supply cap so as to expand toward the rear and is in close contact with the front end surface of the fuel supply cap, and the seal lip bends outward with the seal base as a fulcrum. A third feature is that the pressure in the supply cap is released to the outside.

さらにまた本発明は,第2又は第3の特徴に加えて,燃料噴射弁における前記一方向シール部の位置を一定に規制する位置決め手段を,燃料噴射弁及び前記クッションリング間に設けたことを第4の特徴とする。   Furthermore, the present invention is characterized in that, in addition to the second or third feature, positioning means for restricting the position of the one-way seal portion in the fuel injection valve to be constant is provided between the fuel injection valve and the cushion ring. The fourth feature.

さらにまた本発明は,第4の特徴に加えて,前記環状肩部を,燃料噴射弁の中間部に形成され且つ合成樹脂製の被覆層で被覆される,前記燃料入口筒部より大径のコイル部の後端で構成し,この環状肩部を,第1半円状肩部と,この第1半円状肩部に対して軸方向にずれて配置される第2半円状肩部と,これら第1及び第2半円状肩部間を接続するように起立する起立壁とで構成する一方,前記クッションリングの前端面を,前記第1及び第2半円状肩部にそれぞれ当接する第1及び第2半円状端面と,これら半円状端面間を接続するように起立するストッパ面とで構成し,燃料噴射弁及びクッションリングの相対回転を阻止するように互いに当接する前記起立壁及びストッパ面により前記位置決め手段を構成したことを第5の特徴とする。   Furthermore, in addition to the fourth feature of the present invention, the annular shoulder portion is formed at an intermediate portion of the fuel injection valve and covered with a synthetic resin coating layer and has a diameter larger than that of the fuel inlet tube portion. Consists of a rear end of the coil portion, and the annular shoulder portion is arranged in a first semicircular shoulder portion and a second semicircular shoulder portion that is arranged so as to be axially displaced with respect to the first semicircular shoulder portion. And a standing wall that rises so as to connect between the first and second semicircular shoulders, and the front end surface of the cushion ring is respectively connected to the first and second semicircular shoulders. The first and second semicircular end surfaces that contact each other and a stopper surface that stands up so as to connect the semicircular end surfaces are in contact with each other so as to prevent relative rotation of the fuel injection valve and the cushion ring. According to a fifth aspect of the present invention, the positioning means is configured by the upright wall and the stopper surface.

本発明の第1の特徴によれば,クッションリングの少なくとも一部に,前記燃料供給キャップ内から該クッションリング外への一方向のみの圧力移動を可能とする一方向シール部を形成したことで,燃料噴射弁の支持構造の組立後,燃料供給キャップへの空気圧送による検査時,一方向シール部からの空気の流出の有無によって,燃料入口筒部へのOリングの装着忘れやそのOリングの損傷の有無を検知することができる。しかも使用に当たって,洗浄水やダスト等が一方向シール部に外部から吹きつけられても,一方向シール部は,燃料供給キャップの前端面に密接する閉じ状態を維持しているので,洗浄水やダスト等の燃料供給キャップへの侵入を防ぐことができる。   According to the first aspect of the present invention, a unidirectional seal portion that enables pressure movement in only one direction from the inside of the fuel supply cap to the outside of the cushion ring is formed on at least a part of the cushion ring. After the assembly of the fuel injection valve support structure, when inspecting by air pressure feeding to the fuel supply cap, depending on the presence or absence of air outflow from the one-way seal part, forgetting to attach the O-ring to the fuel inlet cylinder or its O-ring The presence or absence of damage can be detected. In addition, even when cleaning water or dust is blown from the outside to the one-way seal part during use, the one-way seal part maintains a closed state in close contact with the front end surface of the fuel supply cap. Intrusion of dust or the like into the fuel supply cap can be prevented.

本発明の第2の特徴によれば,シールリップには,一方向弁機能に適して可撓性を,またクッション部には,燃料噴射弁の弾性支持に適して剛性をそれぞれ付与することができ,これによりクッションリングは,一方向シール部を具備しながら燃料噴射弁に対する安定した弾性支持機能を発揮することができる。   According to the second feature of the present invention, the seal lip is provided with flexibility suitable for the one-way valve function, and the cushion portion is provided with rigidity suitable for elastic support of the fuel injection valve. Thus, the cushion ring can exhibit a stable elastic support function for the fuel injection valve while having a one-way seal portion.

本発明の第3の特徴によれば,一方向シール部のシールリップには良好な一方向弁機能を付与することができ,またそのシール基部は,クッション部と共に燃料入口筒部の外周に嵌合することで,クッションリングの位置ずれを防ぐことができる。   According to the third feature of the present invention, the seal lip of the one-way seal portion can be provided with a good one-way valve function, and the seal base portion is fitted to the outer periphery of the fuel inlet cylinder portion together with the cushion portion. By combining, it is possible to prevent displacement of the cushion ring.

本発明の第4の特徴によれば,燃料噴射弁における前記一方向シール部の位置を一定に規制する位置決め手段を,燃料噴射弁及び前記クッションリング間に設けることで,一方向シール部の位置を,例えばコイル部の一側に突設されるカプラを基準にして直ちに知ることができ,検査時,一方向シール部からの空気の流出の確認を確実に行うことができ,検査の確実性と作業能率の向上を図ることができる。   According to the fourth aspect of the present invention, the positioning means for restricting the position of the one-way seal portion in the fuel injection valve to be constant is provided between the fuel injection valve and the cushion ring, so that the position of the one-way seal portion is For example, with reference to a coupler protruding from one side of the coil section, and during the inspection, it is possible to confirm the outflow of air from the one-way seal section. And work efficiency can be improved.

本発明の第5の特徴によれば,前記位置決め手段を構成する起立壁及びストッパ面は,コイル部の被覆層及びクッションリングの成形と共に得ることができ,特別な位置決め手段を設けずに済み,コストアップを抑えることができる。   According to the fifth aspect of the present invention, the standing wall and the stopper surface constituting the positioning means can be obtained together with the molding of the coating layer of the coil portion and the cushion ring, and there is no need to provide a special positioning means. Cost increase can be suppressed.

本発明の支持構造により燃料噴射弁をエンジンに取り付けた状態を示す縦断側面図。1 is a longitudinal side view showing a state in which a fuel injection valve is attached to an engine by a support structure of the present invention. 図1の2矢視図。FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1. 燃料噴射弁の要部とクッションリングの分解斜視図。The disassembled perspective view of the principal part of a fuel injection valve and a cushion ring. (A)は一方向シール部を示す図2のA−A線断面拡大図,(B)及び(C)はその変形例である。(A) is an AA line cross-sectional enlarged view of FIG. 2 which shows a one-way seal part, (B) and (C) are the modifications.

本発明の実施の形態を,添付図面に基づいて以下に説明する。尚,本発明においては,電磁式燃料噴射弁の燃料噴射部側を前方,燃料入口筒部側を後方という。   Embodiments of the present invention will be described below with reference to the accompanying drawings. In the present invention, the fuel injection portion side of the electromagnetic fuel injection valve is referred to as the front, and the fuel inlet cylinder portion side is referred to as the rear.

図1において,エンジンの吸気管1(スロットルボディを含む)の一側壁に取り付け孔2が設けられ,この取り付け孔2の外端開口部は環状凹部2aに形成される。   In FIG. 1, a mounting hole 2 is provided in one side wall of an intake pipe 1 (including a throttle body) of the engine, and an outer end opening of the mounting hole 2 is formed in an annular recess 2a.

一方,この吸気管1に取り付けられた電磁式燃料噴射弁(以下,単に燃料噴射弁という。)Iは,前端に燃料噴射部5,後端に燃料入口筒部6,中間部に,燃料噴射部5及び燃料入口筒部6より大径のコイル部11を有しており,その燃料噴射部5の根元の外周にゴム等の弾性材よりなるクッション・シール部材4が装着され,燃料入口筒部6の外周に形成されたシール溝7にはOリング8が装着される。   On the other hand, an electromagnetic fuel injection valve (hereinafter simply referred to as a fuel injection valve) I attached to the intake pipe 1 has a fuel injection portion 5 at the front end, a fuel inlet cylinder portion 6 at the rear end, and a fuel injection portion at the intermediate portion. A coil portion 11 having a diameter larger than that of the portion 5 and the fuel inlet tube portion 6 is provided, and a cushion / seal member 4 made of an elastic material such as rubber is mounted on the outer periphery of the base of the fuel injection portion 5, and the fuel inlet tube An O-ring 8 is attached to the seal groove 7 formed on the outer periphery of the portion 6.

前記コイル部11は,燃料噴射弁Iの固定コア14を囲繞するコイル9と,このコイル9を埋封するようにモールド成形される合成樹脂製の被覆層10とを備えており,その被覆層10には,その一側方へ張り出すカプラ12が一体成形され,このカプラ12は,前記コイル9に連なる通電用端子13を収容し保持する。被覆層10の,燃料噴射部5側を向いた端面は前方環状肩部15とされ,燃料入口筒部6側を向いた端面は後方環状肩部16とされる。   The coil portion 11 includes a coil 9 that surrounds the fixed core 14 of the fuel injection valve I, and a synthetic resin coating layer 10 that is molded so as to embed the coil 9. 10, a coupler 12 projecting to one side is integrally formed, and this coupler 12 accommodates and holds a current-carrying terminal 13 connected to the coil 9. An end surface of the coating layer 10 facing the fuel injection portion 5 side is a front annular shoulder portion 15, and an end surface facing the fuel inlet tube portion 6 side is a rear annular shoulder portion 16.

燃料噴射部5は,被覆層10の前方環状肩部15でクッション・シール部材4を前記環状凹部2aに押し込むようにして前記取り付け孔2に嵌装される。   The fuel injection portion 5 is fitted into the mounting hole 2 so that the cushion / seal member 4 is pushed into the annular recess 2a by the front annular shoulder 15 of the coating layer 10.

後方環状肩部16には,燃料入口筒部6の根元の外周に嵌合される,ゴム等の弾性材よりなるクッションリング17が当接配置され,このクッションリング17を介して燃料噴射弁Iを取り付け孔2側に押圧保持すると共に燃料入口筒部6に燃料を供給する燃料供給キャップ20が燃料入口筒部6に嵌装される。その際,前記Oリング8が燃料供給キャップ20の内周面に密接する。   A cushion ring 17 made of an elastic material such as rubber, which is fitted to the outer periphery of the base of the fuel inlet cylinder portion 6, is disposed in contact with the rear annular shoulder portion 16, and the fuel injection valve I is interposed through the cushion ring 17. A fuel supply cap 20 that presses and holds the fuel to the mounting hole 2 side and supplies fuel to the fuel inlet cylinder 6 is fitted into the fuel inlet cylinder 6. At this time, the O-ring 8 is in close contact with the inner peripheral surface of the fuel supply cap 20.

燃料供給キャップ20は合成樹脂製で円筒状をなしており,その一側には支持腕21,他側には燃料ジョイント22が一体に突設され,その支持腕21は,そのボルト孔23に挿通させたボルト24を吸気管1の所定箇所に形成された取り付けボス25のねじ孔26に螺合緊締することにより,吸気管1の所定箇所に固着される。このとき,前記クッション・シール部材4及びクッションリング17に圧縮方向のセット荷重が付与され,これによって燃料噴射弁Iは吸気管1及び燃料供給キャップ20間で弾性支持されることになる。   The fuel supply cap 20 is made of synthetic resin and has a cylindrical shape. A support arm 21 is provided on one side of the fuel supply cap 20, and a fuel joint 22 is integrally provided on the other side. The support arm 21 is inserted into the bolt hole 23. The inserted bolt 24 is screwed and tightened into a screw hole 26 of a mounting boss 25 formed at a predetermined position of the intake pipe 1 to be fixed to the predetermined position of the intake pipe 1. At this time, a set load in the compression direction is applied to the cushion / seal member 4 and the cushion ring 17, whereby the fuel injection valve I is elastically supported between the intake pipe 1 and the fuel supply cap 20.

燃料ジョイント22には,図示しない燃料ポンプからの吐出燃料を誘導する燃料導管が接続される。   A fuel conduit for guiding fuel discharged from a fuel pump (not shown) is connected to the fuel joint 22.

図1〜図3(A)に示すように,前記後方環状肩部16は,コイル部11の一半周に亙って延びる第1半円状肩部16aと,この第1半円状肩部16aに対して前方へずれていてコイル部11の他半周に亙って延びる第2半円状肩部16bと,これら第1及び第2半円状肩部16a,16b間を接続するように起立する起立壁16cとで構成され,前記カプラ12は,その第1半円状肩部16aに近接して配置される。   As shown in FIG. 1 to FIG. 3A, the rear annular shoulder portion 16 includes a first semicircular shoulder portion 16a extending over one half circumference of the coil portion 11, and the first semicircular shoulder portion. A second semicircular shoulder portion 16b that is shifted forward with respect to 16a and extends over the other half circumference of the coil portion 11 is connected to the first and second semicircular shoulder portions 16a and 16b. The coupler 12 is disposed in the vicinity of the first semicircular shoulder 16a.

一方,前記クッションリング17の前端面,即ち後方環状肩部16に対向する側の端面は,前記第1及び第2半円状肩部16a,16bにそれぞれ当接する第1及び第2半円状端面17a,17bと,これら半円状端面17a,17b間を接続するように起立するストッパ面17cとで構成され,上記起立壁16c及びストッパ面17cが互いに当接することにより,燃料噴射弁I及びクッションリング17の相対回転を阻止してようになっている。而して,起立壁16c及びストッパ面17cは,燃料噴射弁Iのカプラ12と,クッションリング17に設けられる後述の一方向シール部31との相対位置を規定する位置決め手段27となる。   On the other hand, the front end surface of the cushion ring 17, that is, the end surface on the side facing the rear annular shoulder portion 16, is in contact with the first and second semicircular shoulder portions 16a and 16b, respectively. The end surfaces 17a and 17b and a stopper surface 17c that rises so as to connect the semicircular end surfaces 17a and 17b. The rising wall 16c and the stopper surface 17c come into contact with each other, so that the fuel injection valve I and The relative rotation of the cushion ring 17 is prevented. Thus, the standing wall 16 c and the stopper surface 17 c serve as positioning means 27 for defining the relative position between the coupler 12 of the fuel injection valve I and a one-way seal portion 31 described later provided on the cushion ring 17.

またクッションリング17は,優弧状をなして前記後方環状肩部16及び前記燃料供給キャップ20間の挟持力を支承するクッション部30と,劣弧状をなして前記クッション部30の両周端間を一体に連結する一方向シール部31とで構成され,その一方向シール部31は,前記カプラ12と反対側の前記第2半円状端面17bの領域に配置される。   The cushion ring 17 has a superior arc shape between the cushion portion 30 that supports the clamping force between the rear annular shoulder portion 16 and the fuel supply cap 20, and an inferior arc shape between both peripheral ends of the cushion portion 30. The one-way seal portion 31 is integrally connected, and the one-way seal portion 31 is disposed in the region of the second semicircular end surface 17b opposite to the coupler 12.

図2及び図4(A)に明示するように,一方向シール部31は,燃料入口筒部6の外周に嵌合して前記第2半円状肩部16bに当接する,半径方向の肉厚がクッション部30より薄い円弧状のシール基部31aと,このシール基部31aの後端から後方に向かい拡径するように突出して前記燃料供給キャップ20の前端面に密接する円弧状で可撓性のシールリップ31bとで構成される。換言すれば,シールリップ31bは,後方外向きに傾斜するように形成される。このシールリップ31bの内側は,燃料供給キャップ20の内側と連通するようになっており,その連通をスムーズにすべく,燃料供給キャップ20内側の前方開口部20aはテーパ状に形成される。   As clearly shown in FIGS. 2 and 4 (A), the one-way seal portion 31 is fitted to the outer periphery of the fuel inlet tube portion 6 and abuts against the second semicircular shoulder portion 16b. An arc-shaped seal base portion 31a having a thickness smaller than that of the cushion portion 30, and an arc-shaped and flexible shape that protrudes from the rear end of the seal base portion 31a toward the rear and expands toward the rear and is in close contact with the front end surface of the fuel supply cap 20. The sealing lip 31b. In other words, the seal lip 31b is formed to be inclined rearward and outward. The inside of the seal lip 31b communicates with the inside of the fuel supply cap 20, and the front opening 20a inside the fuel supply cap 20 is formed in a tapered shape so that the communication is smooth.

図4(B)及び(C)は,上記一方向シール部31の変形例を示すもので,図中,図4(A)の一方向シール部31と対応する部分には同一の参照符号を付して,その構成の説明は省略する。   4 (B) and 4 (C) show a modification of the one-way seal portion 31. In the figure, portions corresponding to the one-way seal portion 31 in FIG. A description of the configuration is omitted.

次に,この実施例の作用について説明する。   Next, the operation of this embodiment will be described.

吸気管1に燃料噴射弁Iを取り付けるに当たっては,先ず,燃料噴射弁Iの燃料噴射部5を吸気管1の取り付け孔2に嵌装すると共に,被覆層10の前方環状肩部15によりクッション・シール部材4を環状凹部2aに押し込んで,燃料噴射部5周りをシールする。   In attaching the fuel injection valve I to the intake pipe 1, first, the fuel injection part 5 of the fuel injection valve I is fitted into the attachment hole 2 of the intake pipe 1 and the front annular shoulder 15 of the covering layer 10 cushions the The seal member 4 is pushed into the annular recess 2a to seal around the fuel injection part 5.

次いで,クッションリング17を燃料入口筒部6の根元外周に嵌合して,その第1及び第2半円状端面28a,28bを,コイル部11の第1及び第2半円状肩部16a,16bに当接させると共に,回転ストッパ面28cを起立壁16cに当接し得るよう対向させる。その後,燃料供給キャップ20を燃料入口筒部6の外周に嵌装して,Oリング8に燃料供給キャップ20の内周面を密接させる。   Next, the cushion ring 17 is fitted to the outer periphery of the base of the fuel inlet cylinder portion 6, and the first and second semicircular end surfaces 28 a and 28 b are connected to the first and second semicircular shoulder portions 16 a of the coil portion 11. , 16b, and the rotation stopper surface 28c is opposed to the upright wall 16c. Thereafter, the fuel supply cap 20 is fitted on the outer periphery of the fuel inlet cylinder 6, and the inner peripheral surface of the fuel supply cap 20 is brought into close contact with the O-ring 8.

そして,燃料供給キャップ20を前方へ押圧してクッション・シール部材4及びクッションリング17に圧縮方向のセット荷重を加えながら,燃料供給キャップ20の支持腕21を吸気管1の取り付けボス25にボルト24で固着する。   The support arm 21 of the fuel supply cap 20 is attached to the mounting boss 25 of the intake pipe 1 with a bolt 24 while pressing the fuel supply cap 20 forward to apply a set load in the compression direction to the cushion / seal member 4 and the cushion ring 17. Secure with.

このような組立後,燃料入口筒部6へのOリング8の装着忘れやOリング8の損傷の有無を検査するために,燃料供給キャップ20に空気を圧送する。而して,Oリング8の装着忘れ又はOリング8に損傷がある場合には,燃料供給キャップ20に圧送した空気が燃料供給キャップ20の内周面に沿ってクッションリング17側へリークして,一方向シール部31のシールリップ31bの内側面を押圧するので,後方外向きに傾斜したシールリップ31bは,図4(A)に鎖線で示すように,シール基部31aを支点として外側方へ撓んで燃料供給キャップ20の前端面より離れ,その離れた箇所から上記のリーク空気が流出し,その流出を検知したとき,Oリング8の装着忘れ又はOリング8の損傷と判定し,再組立を行う。またシールリップ31bから空気の流出がない場合には,Oリング8の装着忘れも,Oリング8の損傷もないと判定する。シールリップ31bからの空気の流出は,圧力センサ又は検査員の触感により検知される。この検査の際,一方向シール部31の円弧状のシール基部31aは,クッション部30と共に燃料入口筒部6の外周に嵌合しているので,クッションリング17の位置ずれを防ぐことができる。   After such assembly, air is pumped to the fuel supply cap 20 in order to check whether the O-ring 8 is forgotten to be attached to the fuel inlet cylinder 6 or whether the O-ring 8 is damaged. Thus, when the O-ring 8 is forgotten to be installed or the O-ring 8 is damaged, the air pressure fed to the fuel supply cap 20 leaks to the cushion ring 17 side along the inner peripheral surface of the fuel supply cap 20. Since the inner surface of the seal lip 31b of the one-way seal portion 31 is pressed, the seal lip 31b inclined rearward and outward is outward with the seal base portion 31a as a fulcrum as shown by a chain line in FIG. Bending away from the front end face of the fuel supply cap 20, the leaked air flows out from the distant place, and when the outflow is detected, it is determined that the O-ring 8 is forgotten to be installed or the O-ring 8 is damaged and reassembled. I do. If there is no air outflow from the seal lip 31b, it is determined that neither the O-ring 8 is forgotten nor the O-ring 8 is damaged. The outflow of air from the seal lip 31b is detected by a tactile sensation of a pressure sensor or an inspector. At the time of this inspection, since the arc-shaped seal base 31a of the one-way seal portion 31 is fitted to the outer periphery of the fuel inlet cylinder portion 6 together with the cushion portion 30, the displacement of the cushion ring 17 can be prevented.

一方,吸気管1をエンジンに取り付けた使用状態において,洗浄水やダスト等がクッションリング17の一方向シール部31に外方から吹きつけられた場合には,洗浄水やダスト等の圧力は,後方外向きに傾斜したシールリップ31bに,これを燃料供給キャップ20の前端面により密着する方向に作用することになるので,シールリップ31bは閉じ状態を維持し,洗浄水やダスト等の燃料供給キャップ20内への侵入を防ぐことができる。したがって,一方向シール部31は,内部圧力により開弁し,外部圧力によっては閉弁状態を維持する一方向弁の機能を持つことになる。   On the other hand, when cleaning water or dust is blown from the outside to the one-way seal portion 31 of the cushion ring 17 in a state where the intake pipe 1 is attached to the engine, the pressure of the cleaning water or dust is This acts on the seal lip 31b inclined outward and in the direction in which the front end surface of the fuel supply cap 20 is in close contact with the front end surface of the fuel supply cap 20, so that the seal lip 31b is kept closed and fuel supply such as cleaning water and dust is supplied. Intrusion into the cap 20 can be prevented. Therefore, the one-way seal part 31 has a function of a one-way valve that opens by an internal pressure and maintains a closed state by an external pressure.

ところで,クッションリング17は,優弧状をなして前記後方環状肩部16及び燃料供給キャップ20間の挟持力を支承するクッション部30と,劣弧状をなしてクッション部30に一体に連結される一方向シール部31とで構成されるので,シールリップ31bには,一方向弁機能に適して可撓性を,またクッション部30には,燃料噴射弁Iの弾性支持に適して剛性をそれぞれ付与することができ,これによりクッションリング17は,一方向シール部31を具備しながら燃料噴射弁Iに対する安定した弾性支持機能を発揮することができる。   By the way, the cushion ring 17 is integrally connected to the cushion portion 30 which forms a superior arc shape and supports the clamping force between the rear annular shoulder portion 16 and the fuel supply cap 20 and an inferior arc shape. Since it is composed of the direction seal portion 31, the seal lip 31b is provided with flexibility suitable for a one-way valve function, and the cushion portion 30 is provided with rigidity suitable for elastic support of the fuel injection valve I. Accordingly, the cushion ring 17 can exhibit a stable elastic support function for the fuel injection valve I while having the one-way seal portion 31.

また燃料噴射弁I及び前記クッションリング17間には,燃料噴射弁Iにおける一方向シール部31の位置をカプラ12と反対側の所定位置に規定する位置決め手段27が設けられるので,一方向シール部31の位置を,カプラ12を基準にして直ちに知ることができ,検査時,一方向シール部31からの空気の流出の確認を確実に行うことができ,検査の確実性と作業能率の向上に寄与し得る。   Further, a positioning means 27 is provided between the fuel injection valve I and the cushion ring 17 so as to define the position of the one-way seal portion 31 in the fuel injection valve I at a predetermined position opposite to the coupler 12. The position of 31 can be immediately known on the basis of the coupler 12, and the outflow of air from the one-way seal portion 31 can be surely confirmed at the time of inspection, which improves the reliability of inspection and the work efficiency. Can contribute.

またコイル部11の被覆層10の成形の際,その後方環状肩部16として,第1半円状肩部と,この第1半円状肩部16aに対して前方へずれて配置される第2半円状肩部16bと,これら第1及び第2半円状肩部16a,16b間を接続するように起立する起立壁16cとが形成され,一方,クッションリング17の成形の際,その前端面として,第1及び第2半円状肩部16a,16bにそれぞれ当接する第1及び第2半円状端面17a,17bと,これら半円状端面17a,17b間を接続するように起立するストッパ面17cとが形成され,上記起立壁16c及びストッパ面17cが,互いに当接してカプラ12及び一方向シール部31の相対位置を規定する位置決め手段27を構成するので,この位置決め手段27は,被覆層10及びクッションリング17の成形と共に得ることができ,特別な位置決め手段を設けずに済み,コストアップを抑えることができる。   Further, when the coating layer 10 of the coil part 11 is formed, the first semicircular shoulder part and the first semicircular shoulder part 16a are arranged so as to be shifted forward with respect to the rear annular shoulder part 16. Two semicircular shoulders 16b and an upstanding wall 16c standing so as to connect between the first and second semicircular shoulders 16a, 16b are formed. As the front end face, the first and second semicircular end faces 17a and 17b that are in contact with the first and second semicircular shoulder portions 16a and 16b, respectively, and the semicircular end faces 17a and 17b are erected so as to be connected. The stopper surface 17c is formed, and the standing wall 16c and the stopper surface 17c are in contact with each other to form a positioning means 27 that defines the relative position of the coupler 12 and the one-way seal portion 31, so that the positioning means 27 , Coating layer 10 Can be obtained with molding of fine cushion ring 17, requires without providing special positioning means, it is possible to suppress the cost increase.

以上,本発明の実施例について説明したが,本発明はそれに限定されることなく,その要旨を逸脱しない範囲で種々の設計変更が可能である。例えば,取り付け孔2は,エンジンの吸入管に設けることもできる。また本発明は多気筒エンジン用としても実施可能である。   As mentioned above, although the Example of this invention was described, this invention is not limited to it, A various design change is possible in the range which does not deviate from the summary. For example, the mounting hole 2 can be provided in the intake pipe of the engine. The present invention can also be implemented for a multi-cylinder engine.

I・・・・・燃料噴射弁
2・・・・・取り付け孔
5・・・・・燃料噴射部
6・・・・・燃料入口筒部
8・・・・・Oリング
10・・・・被覆層
11・・・・コイル部
12・・・・カプラ
16・・・・環状肩部(後方環状肩部)
16a・・・第1半円状肩部
16b・・・第2半円状肩部
16c・・・起立壁
20・・・・燃料供給キャップ
27・・・・位置決め手段
30・・・・クッション部
31・・・・一方向シール部
31a・・・シール基部
31b・・・シールリップ
I ... Fuel injection valve 2 ... Mounting hole 5 ... Fuel injection part 6 ... Fuel inlet cylinder part 8 ... O-ring 10 ... Cover Layer 11 ... Coil part 12 ... Coupler 16 ... Ring shoulder (back ring shoulder)
16a ... first semicircular shoulder 16b ... second semicircular shoulder 16c ... standing wall 20 ... fuel supply cap 27 ... positioning means 30 ... cushion part 31 ··· One-way seal portion 31a ··· Seal base portion 31b ··· Seal lip

Claims (5)

前端に燃料噴射部(5),後端に燃料入口筒部(6),中間部に後向きの環状肩部(16)を有する燃料噴射弁(I)の支持構造であって,前記燃料入口筒部(6)の外周にOリング(8)を装着し,前記環状肩部(16)に,前記燃料入口筒部(6)の外周に嵌合するクッションリング(17)を当接配置し,前記燃料噴射部(5)をエンジンの取り付け孔(2)に嵌装すると共に,前記燃料入口筒部(6)の外周に燃料供給キャップを嵌装し,この燃料供給キャップ(20)の内周面に前記Oリング(8)を密接させると共に,この燃料供給キャップ(20)の前端面で前記クッションリング(17)を前記取り付け孔(2)側に押圧して燃料噴射弁(I)を支持するようにしたものにおいて,
前記クッションリング(17)の少なくとも一部に,前記燃料供給キャップ(20)内から該クッションリング(17)外への一方向のみの圧力移動を可能とする一方向シール部(31)を形成したことを特徴とする,燃料噴射弁の支持構造。
A fuel injection valve (I) supporting structure having a fuel injection portion (5) at a front end, a fuel inlet tube portion (6) at a rear end, and a rearward annular shoulder portion (16) at an intermediate portion, the fuel inlet tube An O-ring (8) is mounted on the outer periphery of the portion (6), and a cushion ring (17) fitted to the outer periphery of the fuel inlet tube portion (6) is disposed in contact with the annular shoulder portion (16). The fuel injection part (5) is fitted into the mounting hole (2) of the engine, and a fuel supply cap is fitted to the outer periphery of the fuel inlet tube part (6). The inner periphery of the fuel supply cap (20) The O-ring (8) is brought into close contact with the surface, and the fuel injection valve (I) is supported by pressing the cushion ring (17) toward the mounting hole (2) on the front end surface of the fuel supply cap (20). In what I did,
A unidirectional seal portion (31) is formed on at least a part of the cushion ring (17) to enable pressure movement in only one direction from the inside of the fuel supply cap (20) to the outside of the cushion ring (17). A fuel injection valve support structure.
請求項1記載の燃料噴射弁の支持構造において,
前記クッションリング(17)を,優弧状をなして前記環状肩部(16)及び前記燃料供給キャップ(20)間の挟持力を支承するクッション部(30)と,劣弧状をなして前記クッション部(30)の両周端間を一体に連結する前記一方向シール部(31)とで構成したことを特徴とする,燃料噴射弁の支持構造。
The fuel injection valve support structure according to claim 1,
The cushion ring (17) is formed in a superior arc shape and a cushion portion (30) for supporting a clamping force between the annular shoulder portion (16) and the fuel supply cap (20), and the cushion portion is formed in an inferior arc shape. (30) The fuel injection valve support structure characterized by comprising the one-way seal portion (31) integrally connecting the two circumferential ends.
請求項2記載の燃料噴射弁の支持構造において,
前記一方向シール部(31)を,前記クッション部(30)と共に前記燃料入口筒部(6)の外周に嵌合し且つ前記環状肩部(16)に当接するシール基部(31a)と,このシール基部(31a)の後端から後方に向かい拡径するように突出して前記燃料供給キャップ(20)の前端面に密接するシールリップ(31b)とで構成し,そのシールリップ(31b)が前記シール基部(31a)を支点として外側方へ撓むことで前記燃料供給キャップ(20)内の圧力を外部に解放するようにしたことを特徴とする,燃料噴射弁の支持構造。
In the fuel injection valve support structure according to claim 2,
The one-way seal portion (31) is fitted to the outer periphery of the fuel inlet tube portion (6) together with the cushion portion (30), and a seal base portion (31a) is brought into contact with the annular shoulder portion (16). A seal lip (31b) that protrudes from the rear end of the seal base (31a) so as to increase in diameter toward the rear is in contact with the front end surface of the fuel supply cap (20). A fuel injection valve support structure, wherein the pressure in the fuel supply cap (20) is released to the outside by bending outward with the seal base (31a) as a fulcrum.
請求項2又は3記載の燃料噴射弁の支持構造において,
燃料噴射弁(I)における前記一方向シール部(31)の位置を一定に規制する位置決め手段(27)を,燃料噴射弁(I)及び前記クッションリング(17)間に設けたことを特徴とする,燃料噴射弁の支持構造。
In the fuel injection valve support structure according to claim 2 or 3,
A positioning means (27) for regulating the position of the one-way seal portion (31) in the fuel injection valve (I) to be constant is provided between the fuel injection valve (I) and the cushion ring (17). The fuel injection valve support structure.
請求項4記載の燃料噴射弁の支持構造において,
前記環状肩部(16)を,燃料噴射弁(I)の中間部に形成され且つ合成樹脂製の被覆層(10)で被覆される,前記燃料入口筒部(6)より大径のコイル部(11)の後端で構成し,この環状肩部(16)を,第1半円状肩部(16a)と,この第1半円状肩部(16a)に対して軸方向にずれて配置される第2半円状肩部(16b)と,これら第1及び第2半円状肩部(16a,16b)間を接続するように起立する起立壁(16c)とで構成する一方,前記クッションリング(17)の前端面を,前記第1及び第2半円状肩部(16a,16b)にそれぞれ当接する第1及び第2半円状端面(17a,17b)と,これら半円状端面(17a,17b)間を接続するように起立するストッパ面(17c)とで構成し,燃料噴射弁(I)及びクッションリング(17)の相対回転を阻止するように互いに当接する前記起立壁(16c)及びストッパ面(17c)により前記位置決め手段(27)を構成したことを特徴とする,燃料噴射弁の支持構造。
The fuel injection valve support structure according to claim 4,
The annular shoulder portion (16) is formed in an intermediate portion of the fuel injection valve (I) and is covered with a synthetic resin coating layer (10), and a coil portion having a diameter larger than that of the fuel inlet tube portion (6). (11) Consists of the rear end, and the annular shoulder (16) is axially displaced with respect to the first semicircular shoulder (16a) and the first semicircular shoulder (16a). On the other hand, the second semicircular shoulder (16b) disposed and the upright wall (16c) standing up so as to connect the first and second semicircular shoulders (16a, 16b), First and second semicircular end surfaces (17a, 17b) that contact the front end surface of the cushion ring (17) with the first and second semicircular shoulder portions (16a, 16b), respectively, and these semicircular portions And a stopper surface (17c) standing so as to connect between the end faces (17a, 17b), and a fuel injection valve (I) The positioning means (27) is constituted by the upright wall (16c) and the stopper surface (17c) which are in contact with each other so as to prevent relative rotation of the cushion ring (17). Construction.
JP2011243821A 2011-11-07 2011-11-07 Support structure of fuel injection valve Pending JP2013100740A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015094358A (en) * 2013-11-08 2015-05-18 コンチネンタル オートモーティブ システムズ インコーポレイテッドContinental Automotive Systems, Inc. Water intrusion seal for injector having blowout content

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015094358A (en) * 2013-11-08 2015-05-18 コンチネンタル オートモーティブ システムズ インコーポレイテッドContinental Automotive Systems, Inc. Water intrusion seal for injector having blowout content
CN104963749A (en) * 2013-11-08 2015-10-07 大陆汽车系统公司 Injector water intrusion seal with blow-out volume
US9366167B2 (en) 2013-11-08 2016-06-14 Continental Automotive Systems, Inc. Injector water intrusion seal with blow out volume

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