JP4325829B2 - Fuel piping structure of fuel injection engine - Google Patents

Fuel piping structure of fuel injection engine Download PDF

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Publication number
JP4325829B2
JP4325829B2 JP2001064246A JP2001064246A JP4325829B2 JP 4325829 B2 JP4325829 B2 JP 4325829B2 JP 2001064246 A JP2001064246 A JP 2001064246A JP 2001064246 A JP2001064246 A JP 2001064246A JP 4325829 B2 JP4325829 B2 JP 4325829B2
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injector
fuel
diameter portion
housing
quick connector
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JP2002266724A (en
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光雄 中川
俊朗 山本
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2001064246A priority Critical patent/JP4325829B2/en
Priority to TW091102938A priority patent/TW550336B/en
Priority to IT2002TO000172A priority patent/ITTO20020172A1/en
Priority to ES200200516A priority patent/ES2208057A1/en
Priority to CNB021070016A priority patent/CN1213223C/en
Priority to ARP020100844A priority patent/AR032972A1/en
Priority to BRPI0200714-2A priority patent/BR0200714B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/098—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks
    • F16L37/0985—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks the flexible hook extending radially inwardly from an outer part and engaging a bead, recess or the like on an inner part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は燃料噴射式エンジンへ燃料を供給するための燃料配管構造に係り、特に、燃料管とインジェクタとの接続を簡単にしたものに関する。
【０００２】
【従来の技術】
燃料噴射式エンジンにおけるインジェクタは、噴射口側を吸気通路へ通じる接続孔へ差し込んで別体のホルダーによりエンジン側へ固定され、このホルダーへ接続された燃料管を介して燃料ポンプから燃料を供給されるようになっている。また、燃料管のうちインジェクタ接続部分を剛性のある金属製とし、この部分をエンジン側へ固定することにより燃料管の一部にホルダー機能を兼用させたものもある（例えば実開昭６１−３６１７６号、特開平３−１４９３１３号参照）。
【０００３】
【発明が解決しようとする課題】
ところで、上記従来のインジェクタはホルダーによってエンジン側へ固定する必要があるため、インジェクタへホルダーを取付けてから、さらにホルダーをクリップやボルト等の適宜固定手段でエンジン側へ固定しなければならず、組み付け工数並びに部品点数が多くなるので、これらを削減してそのうえ燃料管の接続を簡単にすることが求められていた。なおこの点は上記燃料管の一部にホルダー機能を兼用させた場合でも同様であった。そこで本願発明はこれらの要請の実現を目的とする。
【０００４】
【課題を解決するための手段】
上記課題を解決するため請求項１に係る燃料噴射式エンジンの燃料配管構造は、エンジンの吸気通路へ取付けられたインジェクタへ燃料管を介して燃料ポンプから燃料を供給する燃料噴射式エンジンの燃料配管構造において、
前記インジェクタを前記吸気通路側へ直接固定し、前記燃料管の少なくともインジェクタ接続側端部にワンタッチ式でインジェクタへ接続するクイックコネクタ（３０）を設け、このクイックコネクタ（３０）を前記インジェクタへ被せて直接抜け止め固定するとともに、
前記クイックコネクタ（３０）は燃料管の一端部が接続するチューブ側接続部（３２）とインジェクタが嵌合する部分とで略Ｖ字状をなすハウジング（３１）を備え、
前記燃料管は樹脂製チューブからなり、燃料タンクより自動２輪車等の車体フレームに沿って延び、前記ハウジングのチューブ側接続部（３２）へ一体に接続し、
前記インジェクタは前記ハウジング（３１）に嵌合するジョイント部（５０）を一体に突出形成し、このジョイント部（５０）に前記クイックコネクタ（３０）を被せて直接抜け止め固定したことを特徴とする。
【０００６】
【発明の効果】
請求項１に係る発明によれば、インジェクタを直接吸気通路側へ固定することにより従来必要とされていたホルダーを省略できるとともに、燃料管の少なくとも一端に設けたクイックコネクタをインジェクタへ被せると抜け止め固定されて直接インジェクタと結合できる。このため、燃料管とインジェクタの接続が簡単になるとともに、ホルダーをエンジン側へ固定するための組み付け工数並びにボルトやクリップ等の固定部材が不要になるので、組み付け工数及び部品点数を削減でき、その結果、コストを削減できる。
【０００７】
このとき、クイックコネクタによりワンタッチ式でインジェクタへ接続できる。
【０００８】
また、インジェクタのジョイント部にクイックコネクタの抜け止め手段と係合するための突起部を形成したので、上記ワンタッチ式の接続を可能にできる。
【０００９】
【発明の実施の形態】
以下、図面に基づいて自動２輪車に適用された一実施例を説明する。なお、以下の説明において使用する上下・左右等の各方向は説明に対応する図示状態を基準とし、前後方向は使用状態における車両の進行方向を基準とする。図１は本願発明の適用された自動２輪車の要部側面を示す図であり、車体フレームは前後方向へ配設されるメインフレーム１とその後端に上下方向へ配設されるピボットプレート２と、メインフレーム１の中間部から斜め上がりに後方へ延びるシートレール３と、ピボットプレート２の上端から後方へ斜め上がりに延びてシートレール３へ接続するリヤフレーム４を備える。
【００１０】
メインフレーム１の前端にはヘッドパイプ５が一体に設けられ、ここで図示しないステアリング軸を回動自在に支持する。メインフレーム１の前部でヘッドパイプ５の近傍にはエアクリーナ６が吊り下げ支持され、さらにその後方には空冷４サイクル式のエンジン７がハンガ８を介して吊り下げ支持されている。なお、エンジン７は後端部においてもピボットプレート２のマウント部９にて支持されている。
【００１１】
ピボットプレート２にはピボット１０が設けられ、ここにリヤスイングアーム１１の前端が軸支され、その後端には図示しない後輪が支持されている。シートレール３上には燃料タンク１２が支持されている。燃料タンク１２は左右両側面下部に形成された段部１２ａより下側部分が左右のシートレール３の間へ入り込んむ下方突出部になっている。燃料タンク１２の上面にはキャップ１３が設けられている。燃料タンク１２の上方にはシート１４が開閉自在設けられ、シート１４を閉じることによりキャップ１３の上を覆うようになっている。
【００１２】
燃料タンク１２内には燃料ポンプ１５が設けられ、この燃料ポンプ１５から延出する燃料管１６が車体前方へ延びてインジェクタ１７へ接続している。燃料管１６は耐ガソリン性に優れた適当な樹脂製チューブよりなり、フロントカバー１８ａ、リヤカバー１８ｂ及びタンクカバー１８ｃからなる車体カバーの内側を通って配管される。
【００１３】
インジェクタ１７は噴射口側端部がインテークマニホールド２３の吸気通路２１に臨むようにスロットルボディ２０へ取付けられている。スロットルボディ２０は吸気通路２１の上流側をエアクリーナ６のクリーンサイド内へ延出し、通路内にスロットルバルブ２２を設けるとともに、吸気通路２１の吸気下流側はインテークマニホールド２３を介してエンジン７の吸気口へ接続している。
【００１４】
図２は燃料配管の構成図であり、燃料ポンプ１５の上部から上方へ突出してさらに後方へ略水平に屈曲して延びるジョイントパイプ２４には、その略水平部周囲にリング状の突起部２５が設けられ、この突起部２５を利用して燃料管１６の一端に設けられたクイックコネクタ２６がワンタッチ式に取付けられている。
【００１５】
クイックコネクタ２６は略Ｌ字状に形成されている。なお、その構造は後述するインジェクタ側のクイックコネクタとほぼ同様のため、インジェクタ側のクイックコネクタにおいて詳細に説明する。図中の符号２７はストレーナ、２８は液面センサである。
燃料管１６は、燃料ポンプ１５の後方を上から下へ向かい、燃料ポンプ１５の下方を斜め前下がりに前方へ延び、中間部で斜め前上がりに向きを変えてさらに前方へ延びてクイックコネクタ３０によってインジェクタ１７へ接続する。すなわち、燃料管１６の両端には２つのクイックコネクタ２６及び３０が一体化されて設けられている。
【００１６】
図３はクイックコネクタ３０及びインジェクタ１７を拡大して示す図であり、クイックコネクタ３０は略Ｖ字状をなすハウジング３１を備え、その一部は燃料管１６の一端部内側へ嵌合するチューブ側接続部３２になっている。チューブ側接続部３２の外周側は先細り状をなしその周囲には断面略鋸歯状の凹凸が形成され、燃料管１６の嵌合部を抜けにくくしている。
【００１７】
ハウジング３１は比較的剛性のある樹脂又は金属等の適宜材料で形成され、図の下方へ向かって細径部３３、中径部３４、太径部３５と次第に太くなり、太径部３５には周方向適当間隔で開口部３６が形成されている。中径部３４の内周側には、Ｏーリング３７及びリテーナ３８の上部３９が嵌合される。
【００１８】
リテーナ３８は本願発明における抜け止め手段に相当する部材であり、上部３９が中径部３４の内側へ嵌合する細径部をなし、下部４０は太径部３５の内側へ嵌合する太径部をなす。下部４０の内周面は下方へ向かって次第に外方へ広がるテーパー面４１をなし、このテーパー面４１と上部３９のストレート状の内周面との接続部にはリング状の係合溝４２が形成されている。
【００１９】
下部４０の下端部は細径部３３の軸線方向へ突出する突起４３をなし、太径部３５の下端部をなす肉厚部４４の内側へ嵌合する。また、下部４０の外周部は開口部３６内へ嵌合する側方突起部４５をなす。
【００２０】
一方、インジェクタ１７はハウジング３１の細径部３３部分内周とほぼ同径でハウジング３１の内側へ嵌合するジョイント部５０を備え、その中間部外周にはリング状突起５１が外方へ突出して一体に形成されている。このリング状突起５１は下部４０の係合溝４２へ係合する位置にある。
【００２１】
したがって、クイックコネクタ３０をインジェクタ１７のジョイント部５０へ被せると、まずジョイント部５０の上端がクイックコネクタ３０の下端である突起４３の内周側からハウジング３１内へ入り、太径部３５の内周側及びＯーリング３７の内周側を通って細径部３３の内周へ嵌合する。このとき、リング状突起５１はまずテーパー面４１に案内されて図の上方へ進み、下部４０を外方へ押し広げながら上方へ移動して係合溝４２へ係合する。
【００２２】
これによりジョイント部５０はリテーナ３８と係合して抜け止めされ、かつリテーナ３８は側方突起部４５が開口部３６内へ嵌合することによりハウジング３１と係合するため、クイックコネクタ３０はリテーナ３８を介してインジェクタ１７のジョイント部５０へ抜け止めされて結合するから、クイックコネクタ３０をジョイント部５０へ被せるだけでワンタッチ式に接続できる。
【００２３】
インジェクタ１７の下部周囲にはリング状のフランジ５２が外方へ突出して一体に形成され、シール５３を介してロック部５６へ嵌合して直接取付けられる。ロック部５６は、インテークマニホールド２３の一部をなすスロットルボデイ２０の吸気通路壁部５４に形成された貫通孔５５の開口部を囲むように形成される。インジェクタ１７の下端５７は噴射口をなし、貫通孔５５から吸気通路２１内へ臨んでいる。
【００２４】
貫通孔５５は斜め上方を指向するインテークマニホールド２３の湾曲部上に連通するため、インジェクタ１７の下端５７から噴射される燃料の噴射中心方向が図示しない燃焼室の吸気口へ指向してほぼ垂直になるるように下向きに取付けられている（図１参照）。
【００２５】
図４はインジェクタ１７の取付座であるロック部５６を、インジェクタ１７の軸線方向上方から示す図であり、ロック部５６は半径方向内方へ張り出す部分として１８０°間隔で対称位置に形成され、その下方にフランジ５２を嵌合するための嵌合溝５６ａが形成されている。一方フランジ５２は外周側がロック部５６の内周よりも内側になる細径部５８と、嵌合溝５６ａへ嵌合してロック部５６の下へ重なる太径部５９を１８０°間隔で形成してある（図３参照）。
【００２６】
図４に示すように細径部５８をロック部５６と一致させて下端５７を貫通孔５５へ差し込み、その後インジェクタ１７を軸線回りに略９０°時計回り方向（図のＡ矢示方向）へ回動させると、フランジ５２の太径部５９がロック部５６の下側に形成されている嵌合溝５６ａへ嵌合して抜け止めされることにより、従来のホルダーを必要とせずにインテークマニホールド側へ直接固定される。なお、嵌合溝５６ａの一端部は閉塞されて回り止め部５６ｂをなし、インジェクタ１７を時計回り方向へ回し過ぎること又は反時計回り方向（Ａ矢示と反対方向）へ回動して取付けることを防止できる。
【００２７】
次に、本実施例の作用を説明する。図３及び図４に示すように、インジェクタ１７はそれ自体でインテークマニホールド２３の一部をなすロック部５６へ直接取付けられて固定される。したがって、従来のように別体又は燃料管１６の一部として一体に構成されたホルダーを必要とせず、このホルダーをボルトやクリップ等でエンジン側へ固定することが不要になる。したがって、部品点数及び組み付け工数を削減できる。
【００２８】
また、燃料管１６の一端へクイックコネクタ３０を一体に設けたので、クイックコネクタ３０をインジェクタ１７へ被せると、クイックコネクタ３０がワンタッチ式にインジェクタ１７へ係合して抜け止め保持されるから、燃料管１６のインジェクタ１７に対する接続作業が簡単かつ迅速になる。
【００２９】
このとき、ジョイント部５０の周囲にリング状突起５１を設けたので、リテーナ３６のジョイント部５０に対する係合が可能になる。また、クイックコネクタ３０が燃料管１６と一体であるから取扱も簡単である。そのうえ、燃料ポンプ１５側にもクイックコネクタ２６を設けたので、燃料ポンプ１５との接続も簡単かつ迅速になる。
【００３０】
なお、本願発明は上記の各実施例に限定されるものではなく、発明の原理内において種々に変形や応用が可能である。例えば、クイックコネクタ２６、３０は実施例構造に限定されず、リテーナ３６のような抜け止め手段を備えたワンタッチ式に接続可能なものであれば公知の類似構造を適宜利用できる。
【図面の簡単な説明】
【図１】実施例の適用された自動２輪車の要部側面図
【図２】燃料配管の構成図
【図３】インジェクタ及び燃料管の接続部を示す図
【図４】インジェクタのエンジン側に対する取付部を示す図
【符号の説明】
６：エアクリーナ、７：エンジン、１２：燃料タンク、１５：燃料ポンプ、１６：燃料管、１７：インジェクタ、２０：ストッロルボディ、２１：吸気通路、２３：インテークマニホールド、３０：クイックコネクタ、３６：リテーナ（抜け止め手段）、５０：ジョイント部、５１：リング状突起（インジェクタに設けた突起部）、５５：貫通孔、５６：ロック部（取付座）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel pipe structure for supplying fuel to a fuel injection type engine, and more particularly to a simplified connection between a fuel pipe and an injector.
[0002]
[Prior art]
An injector in a fuel injection type engine is inserted into a connection hole that leads to an intake passage on the injection port side, and is fixed to the engine side by a separate holder, and fuel is supplied from a fuel pump through a fuel pipe connected to the holder. It has become so. In addition, some of the fuel pipes are made of a rigid metal at the injector connection part, and this part is fixed to the engine side so that a part of the fuel pipe also serves as a holder (for example, Japanese Utility Model Laid-Open No. 61-36176). No., JP-A-3-149313).
[0003]
[Problems to be solved by the invention]
By the way, since the conventional injector needs to be fixed to the engine side by the holder, the holder must be fixed to the engine side by an appropriate fixing means such as a clip or a bolt after the holder is attached to the injector. Since the number of man-hours and the number of parts increase, it has been demanded to reduce these and simplify the connection of the fuel pipe. This point was the same even when a holder function was also used for a part of the fuel pipe. Accordingly, the present invention aims to realize these requirements .
[0004]
[Means for Solving the Problems]
In order to solve the above problems, a fuel piping structure for a fuel injection engine according to claim 1 is a fuel piping for a fuel injection engine for supplying fuel from a fuel pump to an injector attached to an intake passage of the engine via a fuel pipe. In structure
The injector is directly fixed to the intake passage side, and a quick connector (30) for connecting to the injector is provided at least on the injector connection side end of the fuel pipe, and the quick connector (30) is put on the injector. As well as fixing it directly,
The quick connector (30) includes a housing (31) that is substantially V-shaped by a tube side connection portion (32) to which one end of a fuel pipe is connected and a portion in which an injector is fitted.
The fuel pipe is made of a resin tube, extends from a fuel tank along a body frame of a motorcycle or the like, and is integrally connected to the tube side connection portion (32) of the housing.
The injector is characterized in that a joint part (50) that fits into the housing (31) is integrally formed to protrude, and the quick connector (30) is put on the joint part (50) to directly prevent it from being detached. .
[0006]
【The invention's effect】
According to the first aspect of the present invention, the holder that has been conventionally required can be omitted by directly fixing the injector to the intake passage side, and the quick connector provided at at least one end of the fuel pipe can be prevented from being removed. Fixed and can be directly coupled with the injector. For this reason, the connection between the fuel pipe and the injector is simplified, and the assembling man-hours for fixing the holder to the engine side and the fixing members such as bolts and clips are unnecessary, so that the assembling man-hours and the number of parts can be reduced. As a result, costs can be reduced.
[0007]
In this case, it can be connected to the injector at the one-touch type by quick connector.
[0008]
Also, since the forming protrusions for retaining means engaging the quick connector in the joint portion of the Lee Njekuta can allow the connection of the one-touch.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment applied to a motorcycle will be described with reference to the drawings. Note that the directions such as up and down and left and right used in the following description are based on the illustrated state corresponding to the description, and the front and rear direction is based on the traveling direction of the vehicle in the used state. FIG. 1 is a view showing a side surface of a main part of a motorcycle to which the present invention is applied. A body frame is a main frame 1 arranged in the front-rear direction and a pivot plate 2 arranged in the up-down direction at the rear end. And a rear rail 4 extending diagonally upward from the middle portion of the main frame 1 and a rear frame 4 extending diagonally upward from the upper end of the pivot plate 2 and connected to the seat rail 3.
[0010]
A head pipe 5 is integrally provided at the front end of the main frame 1, and a steering shaft (not shown) is rotatably supported here. An air cleaner 6 is suspended and supported near the head pipe 5 at the front portion of the main frame 1, and an air-cooled four-cycle engine 7 is suspended and supported via a hanger 8 behind the air cleaner 6. The engine 7 is supported by the mount portion 9 of the pivot plate 2 at the rear end portion.
[0011]
The pivot plate 2 is provided with a pivot 10 on which a front end of a rear swing arm 11 is pivotally supported, and a rear wheel (not shown) is supported at the rear end. A fuel tank 12 is supported on the seat rail 3. The fuel tank 12 is a downward projecting portion in which a lower side portion from a step portion 12a formed at the lower part of both left and right side surfaces enters between the left and right seat rails 3. A cap 13 is provided on the upper surface of the fuel tank 12. A seat 14 can be opened and closed above the fuel tank 12, and the cap 14 is covered by closing the seat 14.
[0012]
A fuel pump 15 is provided in the fuel tank 12, and a fuel pipe 16 extending from the fuel pump 15 extends forward of the vehicle body and is connected to an injector 17. The fuel pipe 16 is made of an appropriate resin tube excellent in gasoline resistance, and is piped through the inside of the vehicle body cover including the front cover 18a, the rear cover 18b, and the tank cover 18c.
[0013]
The injector 17 is attached to the throttle body 20 so that the end on the injection port side faces the intake passage 21 of the intake manifold 23. The throttle body 20 extends upstream of the intake passage 21 into the clean side of the air cleaner 6 and is provided with a throttle valve 22 in the passage. The intake downstream of the intake passage 21 is connected to the intake port of the engine 7 via the intake manifold 23. Connected to.
[0014]
FIG. 2 is a configuration diagram of the fuel piping. The joint pipe 24 that protrudes upward from the upper part of the fuel pump 15 and further bends and extends in a substantially horizontal direction has a ring-shaped protrusion 25 around the substantially horizontal part. A quick connector 26 provided at one end of the fuel pipe 16 is attached to the one end of the fuel pipe 16 by using the protrusion 25.
[0015]
The quick connector 26 is formed in a substantially L shape. Since the structure is substantially the same as that of the quick connector on the injector side described later, the quick connector on the injector side will be described in detail. Reference numeral 27 in the figure is a strainer, and 28 is a liquid level sensor.
The fuel pipe 16 extends rearwardly from the top of the fuel pump 15, extends forward in a diagonally forward and downward direction below the fuel pump 15, and further forwards by changing the direction in an obliquely upward and downward direction at the intermediate portion. To the injector 17. That is, the two quick connectors 26 and 30 are integrally provided at both ends of the fuel pipe 16.
[0016]
FIG. 3 is an enlarged view of the quick connector 30 and the injector 17. The quick connector 30 includes a housing 31 having a substantially V shape, and a part of the quick connector 30 is fitted to the inside of one end of the fuel pipe 16. It is a connection part 32. The outer peripheral side of the tube side connecting portion 32 is tapered, and irregularities having a substantially sawtooth cross section are formed around the outer periphery of the tube side connecting portion 32 so that the fitting portion of the fuel pipe 16 is difficult to come off.
[0017]
The housing 31 is formed of an appropriate material such as a relatively rigid resin or metal, and gradually becomes thicker with the small diameter portion 33, the medium diameter portion 34, and the large diameter portion 35 toward the lower side of the figure. Openings 36 are formed at appropriate intervals in the circumferential direction. An O-ring 37 and an upper portion 39 of a retainer 38 are fitted on the inner peripheral side of the middle diameter portion 34.
[0018]
The retainer 38 is a member corresponding to the retaining means in the present invention. The upper portion 39 has a small diameter portion that fits inside the medium diameter portion 34, and the lower portion 40 has a large diameter that fits inside the large diameter portion 35. Part. The inner peripheral surface of the lower portion 40 forms a tapered surface 41 that gradually expands outwards downward, and a ring-shaped engagement groove 42 is formed at a connection portion between the tapered surface 41 and the straight inner peripheral surface of the upper portion 39. Is formed.
[0019]
The lower end portion of the lower portion 40 forms a protrusion 43 protruding in the axial direction of the small diameter portion 33 and is fitted inside the thick portion 44 forming the lower end portion of the large diameter portion 35. Further, the outer peripheral portion of the lower portion 40 forms a side protrusion 45 that fits into the opening 36.
[0020]
On the other hand, the injector 17 is provided with a joint portion 50 that is approximately the same diameter as the inner periphery of the thin portion 33 of the housing 31 and fits inside the housing 31, and a ring-shaped protrusion 51 projects outwardly on the outer periphery of the intermediate portion. It is integrally formed. The ring-shaped protrusion 51 is in a position to engage with the engaging groove 42 of the lower portion 40.
[0021]
Therefore, when the quick connector 30 is put on the joint portion 50 of the injector 17, first, the upper end of the joint portion 50 enters the housing 31 from the inner peripheral side of the protrusion 43, which is the lower end of the quick connector 30, and the inner periphery of the large-diameter portion 35. And the inner periphery of the O-ring 37 and the inner periphery of the small-diameter portion 33. At this time, the ring-shaped protrusion 51 is first guided by the tapered surface 41 and proceeds upward in the figure, and moves upward while pushing the lower portion 40 outward and engages with the engaging groove 42.
[0022]
As a result, the joint portion 50 is engaged with the retainer 38 and is prevented from coming off, and the retainer 38 is engaged with the housing 31 by the side projection 45 being fitted into the opening 36, so that the quick connector 30 is retained by the retainer 38. 38, the joint portion 50 of the injector 17 is prevented from coming off and coupled, so that the quick connector 30 can be connected to the joint portion 50 by one-touch connection.
[0023]
Around the lower portion of the injector 17, a ring-shaped flange 52 projects outward and is integrally formed, and is fitted directly to the lock portion 56 via a seal 53. The lock portion 56 is formed so as to surround the opening portion of the through hole 55 formed in the intake passage wall portion 54 of the throttle body 20 that forms part of the intake manifold 23. The lower end 57 of the injector 17 forms an injection port and faces the intake passage 21 from the through hole 55.
[0024]
Since the through hole 55 communicates with the curved portion of the intake manifold 23 directed obliquely upward, the injection center direction of the fuel injected from the lower end 57 of the injector 17 is directed substantially vertically to the intake port of the combustion chamber (not shown). It is attached so that it may become downward (refer FIG. 1).
[0025]
FIG. 4 is a view showing the lock portion 56, which is a mounting seat for the injector 17, from the upper side in the axial direction of the injector 17, and the lock portion 56 is formed at symmetrical positions at intervals of 180 ° as a portion protruding radially inward. A fitting groove 56a for fitting the flange 52 is formed below the fitting groove 56a. On the other hand, the flange 52 is formed with a narrow-diameter portion 58 whose outer peripheral side is inside the inner periphery of the lock portion 56 and a large-diameter portion 59 that fits into the fitting groove 56a and overlaps the lock portion 56 at 180 ° intervals. (See FIG. 3).
[0026]
As shown in FIG. 4, the small-diameter portion 58 is aligned with the lock portion 56 and the lower end 57 is inserted into the through-hole 55, and then the injector 17 is rotated approximately 90 ° clockwise (in the direction indicated by the arrow A) around the axis. When moved, the large-diameter portion 59 of the flange 52 is fitted into a fitting groove 56a formed on the lower side of the lock portion 56 and is prevented from coming off, so that the intake manifold side is not required without using a conventional holder. Fixed directly to. One end portion of the fitting groove 56a is closed to form a rotation preventing portion 56b, and the injector 17 is attached by rotating the injector 17 excessively in the clockwise direction or rotating counterclockwise (the direction opposite to the arrow A). Can be prevented.
[0027]
Next, the operation of this embodiment will be described. As shown in FIGS. 3 and 4, the injector 17 is directly attached and fixed to the lock portion 56 that forms a part of the intake manifold 23. Therefore, it is not necessary to use a separate holder or a holder integrally formed as a part of the fuel pipe 16 as in the prior art, and it is not necessary to fix the holder to the engine side with bolts or clips. Therefore, the number of parts and assembly man-hours can be reduced.
[0028]
In addition, since the quick connector 30 is integrally provided at one end of the fuel pipe 16, when the quick connector 30 is put on the injector 17, the quick connector 30 is engaged with the injector 17 in a one-touch manner and is prevented from being detached. The connection work of the pipe 16 to the injector 17 is simple and quick.
[0029]
At this time, since the ring-shaped protrusion 51 is provided around the joint portion 50, the retainer 36 can be engaged with the joint portion 50. Further, since the quick connector 30 is integrated with the fuel pipe 16, the handling is easy. In addition, since the quick connector 26 is provided also on the fuel pump 15 side, the connection with the fuel pump 15 is simple and quick.
[0030]
The present invention is not limited to the above-described embodiments, and various modifications and applications can be made within the principle of the invention. For example, the quick connectors 26 and 30 are not limited to the structure of the embodiment, and any known similar structure can be used as long as it can be connected in a one-touch manner with a retaining means such as a retainer 36.
[Brief description of the drawings]
FIG. 1 is a side view of an essential part of a motorcycle to which an embodiment is applied. FIG. 2 is a configuration diagram of a fuel pipe. FIG. 3 is a diagram showing a connection portion between an injector and a fuel pipe. Showing the mounting part for
6: Air cleaner, 7: Engine, 12: Fuel tank, 15: Fuel pump, 16: Fuel pipe, 17: Injector, 20: Strol body, 21: Intake passage, 23: Intake manifold, 30: Quick connector, 36: Retainer (prevention means), 50: joint part, 51: ring-shaped protrusion (projection part provided on the injector), 55: through-hole, 56: lock part (mounting seat)

Claims (3)

エンジンの吸気通路へ取付けられたインジェクタへ燃料管を介して燃料ポンプから燃料を供給する燃料噴射式エンジンの燃料配管構造において、
前記インジェクタを前記吸気通路側へ直接固定し、前記燃料管の少なくともインジェクタ接続側端部にワンタッチ式でインジェクタへ接続するクイックコネクタ（３０）を設け、このクイックコネクタ（３０）を前記インジェクタへ被せて直接抜け止め固定するとともに、
前記クイックコネクタ（３０）は燃料管の一端部が接続するチューブ側接続部（３２）とインジェクタが嵌合する部分とで略Ｖ字状をなすハウジング（３１）を備え、
前記燃料管は樹脂製チューブからなり、燃料タンクより自動２輪車等の車体フレームに沿って延び、前記ハウジングのチューブ側接続部（３２）へ一体に接続し、
前記インジェクタは前記ハウジング（３１）に嵌合するジョイント部（５０）を軸線方向に沿って突出形成し、このジョイント部（５０）の中間部外周にリング状突起（５１）を一体に設け、
このジョイント部（５０）に前記クイックコネクタ（３０）を被せて直接抜け止め固定したことを特徴とする燃料噴射式エンジンの燃料配管構造。In a fuel piping structure of a fuel injection engine that supplies fuel from a fuel pump to an injector attached to an intake passage of the engine via a fuel pipe,
The injector directly fixed to the intake passage side, the quick connector (30) connected to the injector at the one-touch at least the injector connection side end of the fuel pipe is provided, the quick connector (30) is covered to the injector As well as fixing it directly ,
The quick connector (30) includes a housing (31) that is substantially V-shaped by a tube side connection portion (32) to which one end of a fuel pipe is connected and a portion in which an injector is fitted.
The fuel pipe is made of a resin tube, extends from a fuel tank along a body frame of a motorcycle or the like, and is integrally connected to the tube side connection portion (32) of the housing.
The injector has a joint portion (50) that fits in the housing (31) and protrudes along the axial direction. A ring-shaped protrusion (51) is integrally provided on the outer periphery of the intermediate portion of the joint portion (50).
A fuel piping structure for a fuel injection type engine characterized in that the quick connector (30) is placed on the joint portion (50) and directly secured to prevent it from coming off. 前記クイックコネクタ（３０）は前記ハウジング（３１）の前記インジェクタが嵌合する部分へ嵌合してハウジング（３１）とインジェクタの間に介在することによりクイックコネクタ（３０）の抜け止め手段をなすリテーナ（３８）を備え、
前記ハウジング（３１）の前記インジェクタが嵌合する部分は、リテーナ（３８）が嵌合する開口端部へ向かって細径部（３３）、中径部（３４）、太径部（３５）と次第に太くなり、中径部（３４）の内周側には、Ｏーリング（３７）が嵌合されるとともに、
リテーナ（３８）はハウジング（３１）の中径部（３４）へ嵌合する細径部（３９）とハウジング（３１）の太径部３５に内側から係合する大径部（４０）を備え、細径部（３９）を中径部３５の内側かつＯーリング（３７）の位置よりも前記開口端側へ嵌合させたことを特徴とする請求項１に記載した燃料噴射式エンジンの燃料配管構造。 The quick connector (30) is engaged with a portion of the housing (31) where the injector is fitted, and is interposed between the housing (31) and the injector, thereby retaining the quick connector (30). (38)
The portion of the housing (31) where the injector is fitted is formed with a narrow-diameter portion (33), a medium-diameter portion (34), and a large-diameter portion (35) toward the opening end where the retainer (38) is fitted. The O-ring (37) is fitted on the inner peripheral side of the medium diameter portion (34),
The retainer (38) includes a small-diameter portion (39) that fits into the medium-diameter portion (34) of the housing (31) and a large-diameter portion (40) that engages with the large-diameter portion 35 of the housing (31) from the inside. The fuel of a fuel injection type engine according to claim 1, wherein the narrow diameter portion (39) is fitted to the inside of the medium diameter portion 35 and closer to the opening end side than the position of the O-ring (37). Piping structure. 前記リテーナ（３８）は細径部（３９）と大径部（４０）の境に環状の係合溝（４２）を備え、前記ジョイント部（５０）を前記リテーナ（３８）の内側へ嵌合させて前記リング状突起（５１）を前記係合溝（４２）に係合させたことを特徴とする請求項２に記載した燃料噴射式エンジンの燃料配管構造。 The retainer (38) includes an annular engagement groove (42) at the boundary between the small diameter portion (39) and the large diameter portion (40), and the joint portion (50) is fitted inside the retainer (38). The fuel piping structure for a fuel injection type engine according to claim 2, wherein the ring-shaped protrusion (51) is engaged with the engagement groove (42) .
JP2001064246A 2001-03-08 2001-03-08 Fuel piping structure of fuel injection engine Expired - Fee Related JP4325829B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP2001064246A JP4325829B2 (en) 2001-03-08 2001-03-08 Fuel piping structure of fuel injection engine
TW091102938A TW550336B (en) 2001-03-08 2002-02-20 Fuel pipe structure for fuel injection engine
IT2002TO000172A ITTO20020172A1 (en) 2001-03-08 2002-02-28 FUEL PIPE STRUCTURE FOR A FUEL INJECTION TYPE ENGINE.
ES200200516A ES2208057A1 (en) 2001-03-08 2002-03-04 Fuel pipe structure for fuel injection engine
CNB021070016A CN1213223C (en) 2001-03-08 2002-03-07 Fuel conduits structure for fuel-injection engine
ARP020100844A AR032972A1 (en) 2001-03-08 2002-03-07 FUEL PIPE STRUCTURE FOR ENGINE FUEL INJECTION TYPE
BRPI0200714-2A BR0200714B1 (en) 2001-03-08 2002-03-08 fuel pipe structure for fuel injection type engine.

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JP4325829B2 true JP4325829B2 (en) 2009-09-02

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JP2007107505A (en) * 2005-10-17 2007-04-26 Yamaha Motor Co Ltd Motorcycle
JP4734179B2 (en) * 2006-05-31 2011-07-27 本田技研工業株式会社 Fuel piping structure
JP4692663B2 (en) * 2009-03-31 2011-06-01 株式会社デンソー connector
CN102359426A (en) * 2011-09-08 2012-02-22 力帆实业(集团)股份有限公司 Fuel supplying system for electric-injection motorcycle
JP6182905B2 (en) * 2013-03-01 2017-08-23 株式会社デンソー Fuel rail
CN106364607B (en) * 2015-07-24 2019-03-15 本田技研工业株式会社 Straddle-type vehicle

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US5067754A (en) * 1980-10-29 1991-11-26 Propietary Technology, Inc. Swivelable quick connector assembly
IT8768127A0 (en) * 1987-12-24 1987-12-24 Weber Srl IMPROVED CONNECTION DEVICE FOR THE SUPPLY OF AN INJECTOR
DE19540784A1 (en) * 1995-11-02 1997-05-07 Raymond A Gmbh & Co Kg Detachable plug connection for receiving a tubular plug-in part
US5803052A (en) * 1997-06-27 1998-09-08 Siemens Automotive Corporation Spring clip for retaining a fuel injector in a fuel rail cup

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BR0200714A (en) 2002-12-03

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