JP3690824B2 - Fuel injection device for internal combustion engine - Google Patents

Fuel injection device for internal combustion engine Download PDF

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Publication number
JP3690824B2
JP3690824B2 JP12216594A JP12216594A JP3690824B2 JP 3690824 B2 JP3690824 B2 JP 3690824B2 JP 12216594 A JP12216594 A JP 12216594A JP 12216594 A JP12216594 A JP 12216594A JP 3690824 B2 JP3690824 B2 JP 3690824B2
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Japan
Prior art keywords
air cleaner
intake passage
injector
fuel injection
injection device
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JP12216594A
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JPH07332208A (en
Inventor
一明 大滝
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Suzuki Motor Co Ltd
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Suzuki Motor Co Ltd
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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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10216—Fuel injectors; Fuel pipes or rails; Fuel pumps or pressure regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/04—Air cleaners specially arranged with respect to engine, to intake system or specially adapted to vehicle; Mounting thereon ; Combinations with other devices
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10026—Plenum chambers
    • F02M35/10052—Plenum chambers special shapes or arrangements of plenum chambers; Constructional details
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10072—Intake runners
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/10177—Engines having multiple fuel injectors or carburettors per cylinder
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/16—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines characterised by use in vehicles
    • F02M35/162—Motorcycles; All-terrain vehicles, e.g. quads, snowmobiles; Small vehicles, e.g. forklifts
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/043—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit upstream of an air throttle valve
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four

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

Description

【０００１】
【産業上の利用分野】
本発明は、燃料を噴射するインジェクターを有する内燃機関の燃料噴射装置に関する。
【０００２】
【従来の技術】
従来、燃料を噴射するインジェクターを有する内燃機関の燃料噴射装置、例えば車両用エンジンの燃料噴射装置においては、エアクリーナーから吸気通路内に送られた空気の量をスロットルバルブの傾斜角度によって調整しかつ適切な流量の燃料をインジェクター先端部のノズルから噴射させて、混合気をエンジンの燃焼室に供給するようにしている。なお、インジェクターの燃料の噴射は、例えば、燃料をポンプによってインジェクターに圧送し、制限された時間だけインジェクター内に備えられたソレノイドバルブを開くことによって行う。
【０００３】
ところが、例えば自動二輪車の場合、エンジン高回転，高負荷時と、低回転，低負荷時とでは、エンジンに要求される燃料の流量が大きく異なるので、一つのインジェクターでは対応しきれないことがある。そこで、吸気通路を構成するスロットルボディーに複数のインジェクターを配設し、該複数のインジェクターによって対応することが考えられる。
【０００４】
ここで、図３は、二つのインジェクターを有する自動二輪車の燃料噴射装置周辺の構造を車両左側方から見た図である。また、図４は、該燃料噴射装置を車両左側方から拡大して見た断面図である。
図３および図４に示した燃料噴射装置は、二つのインジェクターａ，ｂがスロットルボディーｃの周壁に取り付けられたものであって、例えば、インジェクターａを低回転，低負荷時用とし、インジェクターｂを高回転，高負荷時用として、インジェクターａおよびインジェクターｂそれぞれを細かく制御することにより、適切なタイミングで適切な流量の燃料噴射が行われるようにしたものである。なお、図４に示す燃料噴射装置の周辺には、ファンネルｄを介してスロットルボディーｃの上流側端部と連通したエアクリーナーｅと、スロットルボディーｃの下流側端部と連通したシリンダー部ｆ１を備えたエンジンｆとが配設されている。
【０００５】
【発明が解決しようとする課題】
ところで、一般的に、インジェクターから噴射された燃料の粒径は比較的大きいものである。したがって、特にエンジン高回転，高負荷時では、燃料を微粒化させて霧化を促進させるために、インジェクターをなるべくエンジンから離し、噴射された燃料の、燃焼室までの到達距離を長くする必要がある。
したがって、図４に示した燃料噴射装置では、高回転，高負荷時用のインジェクターｂを、インジェクターａおよびスロットルバルブｇよりも後方に配置して霧化の促進を図っている。
【０００６】
しかしながら、この燃料噴射装置においては、インジェクターｂをインジェクターａよりも上流位置に設けたことにより、スロットルボディーｃの長さＬ２が大きくなってしまい、そのために、吸気通路が長くなり、自動二輪車に要求される軽量化・コンパクト化が図りにくくなる。
また、二つのインジェクターａ，ｂの後部がエアクリーナーｇに向けて突出しているため、エアクリーナーｇ（正確にはエアクリーナーボックス）を、二つのインジェクターａ，ｂを避けた形状にせざるを得ず、このために、エアクリーナーｇの容量が小さくなり、出力面でエンジンの性能が影響される恐れがある。
【０００７】
本発明は、前記従来の問題点を鑑みてなされたものであって、その課題は、吸気通路長さを短くし、かつ、エアクリーナーの容量を十分に確保した上で、内燃機関の状態に応じて適切な燃料噴射を行う内燃機関の燃料噴射装置を提供することである。
【０００８】
【課題を解決するための手段】
本発明は、前記課題を解決するために次の構成を有する。
すなわち、本発明は、燃焼室とエアクリーナーとを連通する吸気通路部の通路内に燃料を噴射するインジェクターを複数備え、該複数のインジェクターには前記エアクリーナー内に配置されるインジェクターと吸気通路部に取り付けられるインジェクターとを有し、少なくとも一つを主に内燃機関の高回転高負荷時に作動するインジェクターとする自動二輪車用の内燃機関の燃料噴射装置において、前記エアクリーナーは車両後方且つやや下方に向けて延びたフレーム上に載置固定された燃料タンクの逆Ｕ字形下面に覆われて設けられ、前記吸気通路部はエアクリーナー内に突設したラッパ状のファンネル部と内部にスロットルバルブを備えたスロットルボディ部と吸気ポートに連通するインシュレーター部を備え、前記吸気通路部に取付けられるインジェクタをスロットルボディ部のスロットルバルブの下流に設けるとともに、前記エアクリーナーに一体に突設し吸気通路の中心軸と交差するブラケットにより前記エアクリーナー内に配設されるインジェクターを前記吸気通路の中心軸に沿って配置し、前記吸気通路のラッパ状のファンネル部近傍かつ該ファンネル部よりも上流位置から通路内に向けて燃料を噴射させたことを特徴とする自動二輪車用の内燃機関の燃料噴射装置である。
【０００９】
【作用】
本発明によれば、高回転，高負荷時に作動するインジェクターを、前記吸気通路部の中心軸上かつ前記吸気通路部よりも上流に配置したので、当該高回転，高負荷時用のインジェクターから燃焼室までの距離を大きくとれる。これにより高回転，高負荷時において燃料の霧化の促進が図れるため、前記吸気通路に高回転，高負荷用のインジェクターを設けた構造に比べ、吸気通路長さを短くすることができる。
【００１０】
また、エアクリーナー内に高回転，高負荷時用のインジェクターが収容されるので、少なくとも高回転，高負荷用のインジェクターを避けるために、エアクリーナーの外形を小さくする必要がなくなり、エアクリーナーの形状は、高回転，高負荷時用のインジェクター以外のインジェクターのみを避けた形状にすればよく、これにより、エアクリーナーの容量を大きくできる。
【００１１】
また、エアクリーナーに一体に突設したブラケットに高回転，高負荷時用のインジェクターを取り付けたので、高回転，高負荷時用のインジェクターの吸気通路に対する噴射方向の精度が良くなる。
【００１２】
【実施例】
以下、図面を参照して本発明の一実施例を説明する。
本実施例は、本発明の内燃機関の燃料噴射装置を自動二輪車のエンジンに適用したものである。
図１は、本実施例に係る自動二輪車の燃料噴射装置周辺の構造を車両左側方から見た図である。また、図２は、該燃料噴射装置を車両左側方から拡大して見た断面図である。
【００１３】
本実施例に係る自動二輪車には、図１に示すように、ステアリングヘッドパイプ１６から車両後方かつやや下方に向けて延びたフレーム１８と、このフレーム１８上に載置されて固定された略鞍形の燃料タンク２０と、この燃料タンク２０の逆Ｕ字形下面に覆われたエアクリーナー４と、このエアクリーナー４の下方に配設された四サイクルエンジン８と、エンジン８のシリンダー部８ａ内の燃焼室とエアクリーナー４内とを連通する吸気通路部６とが備えられている。
【００１４】
エアクリーナー４は、例えば樹脂製等のエアクリーナーボックス４ａと、エアクリーナーボックス４ａ内に収容されたフィルター（図示略）部材とから主になる。エアクリーナーボックス４ａは、上方に開放したボックス本体４ａ１と、ボックス本体４ａ１の開放部を塞ぐようにボックス本体４ａ１に締着されたカバー４ａ２とから構成される。
【００１５】
吸気通路部６は、エアクリーナー４のボックス本体４ａ１の後部底面に嵌着されると共にラッパ状の一端部がエアクリーナー４内に突出したファンネル６ａと、このファンネル６ａの他端部にクランプ等で接続された概略円筒形状のスロットルボディー６ｂと、このスロットルボディー６ｂの下流側端部とシリンダー部８ａの吸気ポートとを連通するインシュレーター６ｃとから主に構成される。
【００１６】
スロットルボディー６ｂの内周壁には、図２に示すように、バタフライ型のスロットルバルブ２２が回転自在に支持されていて、このスロットルバルブ２２により、吸気通路部６内を流れる空気量が調整される。
【００１７】
本実施例に係る燃料噴射装置は、吸気通路部６の通路内に燃料を噴射する二つのインジェクター１０，１２を有するものである。
この二つのインジェクターのうち、主にエンジン低回転，低負荷時に作動するインジェクター１０は、スロットルボディー６ｂの内周壁前部に形成された開口部６ｂ１に取り付けられている。
一方、主にエンジン高回転，高負荷時に作動するインジェクター１２は、エアクリーナー４内であって吸気通路部６の中心軸Ｃ上かつファンネル６ａの上流近傍に配置されると共に、エアクリーナー４に一体に突設したブラケット１４に取り付けられている。
【００１８】
ブラケット１４は、ボックス本体４ａ１の内壁に一体形成されてエアクリーナー４内で中心軸Ｃと交差する支持腕１４ａを備え、その交差部には、インジェクター１２の先端部が嵌合する取り付け穴１４ａ１が設けられている。
したがって、エンジン高回転，高負荷時用のインジェクター１２は、その長手方向が吸気通路部６の中心軸Ｃに沿うように、ブラケット１４によってエアクリーナー４内に配置され、ファンネル４ａよりも上流位置から吸気通路部６内に向けて燃料を噴射するようになっている。
【００１９】
以上のような構成を有する本実施例の燃料噴射装置によれば、高回転，高負荷時用のインジェクター１２を、吸気通路部６の中心軸Ｃ上かつファンネル６ａの上流近傍に配置したので、インジェクター１２からシリンダー部８ａ内の燃焼室までの距離を大きくとれる。これにより高回転，高負荷時における燃料の霧化の促進が図れるため、スロットルボディー６ｂの長手方向寸法Ｌ１を短くすることができる。したがって、吸気通路部６を短くできるため、車両の小型化・軽量化が図れる。
【００２０】
また、エアクリーナー４内に高回転，高負荷用のインジェクター１２が収容されるので、インジェクター１２を避けるために、エアクリーナー４のボックス本体４ａ１を凹ますなどして、その外形を小さくする必要がない。よって、エアクリーナー４の容量を十分に確保でき、エンジン８の出力を向上させることができる。
また、エアクリーナー４のボックス本体４ａ１に一体に突設したブラケット２４に高回転，高負荷時用のインジェクター１２を取り付けたので、インジェクター１２の吸気通路部６に対する噴射方向の精度が良くなる。なお、エアクリーナー４とは別体のブラケットを精度良くエアクリーナー４に固定することも可能である。
【００２１】
本実施例は、本発明の好適な実施の態様であり、本発明の技術的範囲はこの実施例に限定されない。
例えば、本実施例は、二つのインジェクターを有する燃料噴射装置であるが、本発明はこれに限定されず、エンジンの高回転時，中回転時および低回転時それぞれを担当する三つのインジェクターを備えた燃料噴射装置等であってもよい。また、本発明の燃料噴射装置は、自動二輪車以外の三輪または四輪等の小型車両に使用されるエンジンなど、燃料を噴射するインジェクターを備えた他の内燃機関にも適用可能である。
【００２２】
【発明の効果】
以上の説明のとおり、本発明によれば、内燃機関の燃料噴射装置において、吸気通路長さを短くすることができ、かつ、エアクリーナーの容量を十分に確保することができると共に、内燃機関の状態に応じて適切な燃料噴射を行うことができる。また、高回転，高負荷時用のインジェクターの吸気通路に対する噴射方向の精度が良くなるため、より適切な燃料噴射が行える。
【図面の簡単な説明】
【図１】本実施例に係る自動二輪車の燃料噴射装置周辺の構造を車両左側方から見た図である。
【図２】本実施例に係る自動二輪車の燃料噴射装置を車両左側方から拡大して見た断面図である。
【図３】二つのインジェクターを有する自動二輪車の燃料噴射装置周辺の構造を車両左側方から見た図である。
【図４】二つのインジェクターを有する自動二輪車の燃料噴射装置を車両左側方から拡大して見た断面図である。
【符号の説明】
４ エアクリーナー
４ａ エアクリーナーボックス
６ 吸気通路部
６ａ ファンネル
６ｂ スロットルボディー
８ 自動二輪車用エンジン（内燃機関の一例）
１０ 低回転，低負荷時用のインジェクター
１２ 高回転，高負荷時用のインジェクター
１４ ブラケット
Ｃ 吸気通路部の中心軸[0001]
[Industrial application fields]
The present invention relates to a fuel injection device for an internal combustion engine having an injector for injecting fuel.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a fuel injection device for an internal combustion engine having an injector that injects fuel, for example, a fuel injection device for a vehicle engine, the amount of air sent from an air cleaner into the intake passage is adjusted by the inclination angle of the throttle valve and An appropriate flow rate of fuel is injected from the nozzle at the tip of the injector so that the air-fuel mixture is supplied to the combustion chamber of the engine. The fuel injection of the injector is performed by, for example, pumping fuel to the injector by a pump and opening a solenoid valve provided in the injector for a limited time.
[0003]
However, in the case of a motorcycle, for example, the flow rate of fuel required for the engine differs greatly between high engine speed and high load and low engine speed and low load. . In view of this, it is conceivable that a plurality of injectors are arranged in the throttle body constituting the intake passage, and the plurality of injectors are used.
[0004]
Here, FIG. 3 is a view of the structure around the fuel injection device of the motorcycle having two injectors as viewed from the left side of the vehicle. FIG. 4 is a cross-sectional view of the fuel injection device as viewed from the left side of the vehicle.
The fuel injection device shown in FIGS. 3 and 4 has two injectors a and b attached to the peripheral wall of the throttle body c. For example, the injector a is used for low rotation and low load, and the injector b For high rotation and high load, the fuel injection at an appropriate flow rate is performed at an appropriate timing by finely controlling each of the injector a and the injector b. In the vicinity of the fuel injection device shown in FIG. 4, an air cleaner e communicating with the upstream end of the throttle body c and a cylinder portion f1 communicating with the downstream end of the throttle body c via the funnel d are provided. The engine f provided is disposed.
[0005]
[Problems to be solved by the invention]
By the way, generally, the particle size of the fuel injected from the injector is relatively large. Therefore, especially at high engine speeds and high loads, in order to atomize the fuel and promote atomization, it is necessary to move the injector away from the engine as much as possible and to increase the reach of the injected fuel to the combustion chamber. is there.
Therefore, in the fuel injection device shown in FIG. 4, the high-speed and high-load injector b is arranged behind the injector a and the throttle valve g to promote atomization.
[0006]
However, in this fuel injection device, the length L2 of the throttle body c is increased by providing the injector b at the upstream position from the injector a. Therefore, the intake passage becomes longer, which is required for the motorcycle. This makes it difficult to reduce weight and size.
In addition, since the rear portions of the two injectors a and b protrude toward the air cleaner g, the air cleaner g (to be exact, the air cleaner box) must be shaped to avoid the two injectors a and b. For this reason, the capacity of the air cleaner g is reduced, and the engine performance may be affected in terms of output.
[0007]
The present invention has been made in view of the above-described conventional problems, and the problem is that the length of the intake passage is shortened and the capacity of the air cleaner is sufficiently secured, and then the state of the internal combustion engine is reached. Accordingly, it is an object of the present invention to provide a fuel injection device for an internal combustion engine that performs appropriate fuel injection.
[0008]
[Means for Solving the Problems]
The present invention has the following configuration in order to solve the above problems.
That is, the present invention includes a plurality of injectors that inject fuel into a passage of an intake passage portion that communicates the combustion chamber and the air cleaner, and the plurality of injectors are disposed in the air cleaner and the intake passage portion. A fuel injection device for an internal combustion engine for a motorcycle , wherein at least one of the injectors operates mainly when the internal combustion engine is operated at a high rotational speed and a high load. A fuel tank mounted on a frame extending toward the surface is covered with an inverted U-shaped bottom surface, and the intake passage portion includes a trumpet-like funnel portion protruding inside the air cleaner and a throttle valve inside. Insulator part communicating with the throttle body part and the intake port Provided with an injector downstream of the throttle valve in the throttle body that is, the injector is disposed more said air cleaner to a bracket which intersects the central axis of the projecting and the intake passage integrally with the air cleaner of the intake passage A fuel for an internal combustion engine for a motorcycle , which is disposed along a central axis and injects fuel from a position near a trumpet-shaped funnel portion of the intake passage and from a position upstream of the funnel portion into the passage. It is an injection device.
[0009]
[Action]
According to the present invention, since the injector that operates at the time of high rotation and high load is disposed on the central axis of the intake passage portion and upstream of the intake passage portion, combustion from the injector for high rotation and high load is performed. The distance to the room can be increased. As a result, the atomization of fuel can be promoted at high rotation and high load, so that the intake passage length can be shortened compared to the structure in which the intake passage is provided with a high rotation and high load injector.
[0010]
In addition, since the high-speed and high-load injectors are housed in the air cleaner, it is not necessary to reduce the outer shape of the air cleaner in order to avoid at least the high-speed and high-load injectors. The shape of the air cleaner can be made to avoid only the injectors other than those for high rotation and high load, and the capacity of the air cleaner can be increased.
[0011]
In addition, since the high rotation and high load injectors are attached to the bracket integrally projecting on the air cleaner, the accuracy of the injection direction with respect to the intake passage of the high rotation and high load injectors is improved.
[0012]
【Example】
An embodiment of the present invention will be described below with reference to the drawings.
In this embodiment, the fuel injection device for an internal combustion engine of the present invention is applied to an engine of a motorcycle.
FIG. 1 is a view of a structure around a fuel injection device for a motorcycle according to this embodiment as viewed from the left side of the vehicle. FIG. 2 is a cross-sectional view of the fuel injection device as viewed from the left side of the vehicle.
[0013]
As shown in FIG. 1, the motorcycle according to the present embodiment includes a frame 18 that extends from the steering head pipe 16 toward the rear and slightly below the vehicle, and a substantially saddle that is placed and fixed on the frame 18. Fuel tank 20, air cleaner 4 covered with an inverted U-shaped lower surface of fuel tank 20, four-cycle engine 8 disposed below air cleaner 4, and cylinder portion 8 a of engine 8 An intake passage portion 6 that communicates between the combustion chamber and the air cleaner 4 is provided.
[0014]
The air cleaner 4 is mainly composed of an air cleaner box 4a made of resin or the like and a filter (not shown) member housed in the air cleaner box 4a. The air cleaner box 4a includes a box body 4a1 that is opened upward, and a cover 4a2 that is fastened to the box body 4a1 so as to close the open portion of the box body 4a1.
[0015]
The intake passage portion 6 is fitted to the bottom of the rear portion of the box body 4a1 of the air cleaner 4 and has a funnel 6a having a trumpet-shaped one end protruding into the air cleaner 4, and a clamp or the like at the other end of the funnel 6a. It is mainly composed of a generally cylindrical throttle body 6b connected and an insulator 6c that communicates the downstream end of the throttle body 6b and the intake port of the cylinder portion 8a.
[0016]
As shown in FIG. 2, a butterfly throttle valve 22 is rotatably supported on the inner peripheral wall of the throttle body 6 b, and the amount of air flowing through the intake passage portion 6 is adjusted by the throttle valve 22. .
[0017]
The fuel injection device according to the present embodiment has two injectors 10 and 12 for injecting fuel into the passage of the intake passage portion 6.
Of these two injectors, the injector 10 that operates mainly at the time of low engine speed and low load is attached to an opening 6b1 formed in the front portion of the inner peripheral wall of the throttle body 6b.
On the other hand, an injector 12 that operates mainly at high engine speed and high load is disposed in the air cleaner 4 on the central axis C of the intake passage portion 6 and in the vicinity of the upstream of the funnel 6a, and is integrated with the air cleaner 4. It is attached to the bracket 14 protrudingly provided.
[0018]
The bracket 14 includes a support arm 14a that is integrally formed on the inner wall of the box body 4a1 and intersects the central axis C in the air cleaner 4, and an attachment hole 14a1 into which the tip of the injector 12 is fitted is formed at the intersection. Is provided.
Therefore, the injector 12 for high engine speed and high load is arranged in the air cleaner 4 by the bracket 14 so that the longitudinal direction thereof is along the central axis C of the intake passage portion 6, and is located upstream from the funnel 4a. Fuel is injected into the intake passage portion 6.
[0019]
According to the fuel injection device of the present embodiment having the above-described configuration, the injector 12 for high rotation and high load is disposed on the central axis C of the intake passage portion 6 and in the vicinity of the upstream of the funnel 6a. The distance from the injector 12 to the combustion chamber in the cylinder portion 8a can be increased. As a result, the atomization of the fuel at the time of high rotation and high load can be promoted, so that the longitudinal dimension L1 of the throttle body 6b can be shortened. Therefore, since the intake passage portion 6 can be shortened, the vehicle can be reduced in size and weight.
[0020]
Further, since the injector 12 for high rotation and high load is accommodated in the air cleaner 4, in order to avoid the injector 12, it is necessary to dent the box body 4a1 of the air cleaner 4 to reduce its outer shape. Absent. Therefore, the capacity of the air cleaner 4 can be sufficiently secured and the output of the engine 8 can be improved.
In addition, since the high-rotation and high-load injector 12 is attached to the bracket 24 that protrudes integrally with the box body 4a1 of the air cleaner 4, the accuracy of the injection direction of the injector 12 with respect to the intake passage portion 6 is improved. In addition, it is also possible to fix the bracket separate from the air cleaner 4 to the air cleaner 4 with high accuracy.
[0021]
The present embodiment is a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to this embodiment.
For example, the present embodiment is a fuel injection device having two injectors, but the present invention is not limited to this, and includes three injectors that are in charge of high engine speed, medium engine speed, and low engine speed, respectively. It may be a fuel injection device or the like. The fuel injection device of the present invention can also be applied to other internal combustion engines equipped with injectors for injecting fuel, such as engines used in small vehicles such as three-wheel or four-wheel vehicles other than motorcycles.
[0022]
【The invention's effect】
As described above, according to the present invention, in the fuel injection device for an internal combustion engine, the length of the intake passage can be shortened, and the capacity of the air cleaner can be sufficiently ensured. Appropriate fuel injection can be performed according to the state. In addition, since the accuracy of the injection direction with respect to the intake passage of the injector for high rotation and high load is improved, more appropriate fuel injection can be performed.
[Brief description of the drawings]
FIG. 1 is a view of a structure around a fuel injection device for a motorcycle according to an embodiment as viewed from the left side of the vehicle.
FIG. 2 is a cross-sectional view of a motorcycle fuel injection device according to the present embodiment as viewed from the left side of the vehicle.
FIG. 3 is a view of a structure around a fuel injection device of a motorcycle having two injectors as viewed from the left side of the vehicle.
FIG. 4 is a cross-sectional view of a motorcycle fuel injection device having two injectors as viewed from the left side of the vehicle.
[Explanation of symbols]
4 Air Cleaner 4a Air Cleaner Box 6 Intake Passage 6a Funnel 6b Throttle Body 8 Motorcycle Engine (An Example of Internal Combustion Engine)
10 Injector for low rotation and low load 12 Injector for high rotation and high load 14 Bracket C Center axis of intake passage

Claims (1)

燃焼室とエアクリーナーとを連通する吸気通路部の通路内に燃料を噴射するインジェクターを複数備え、該複数のインジェクターには前記エアクリーナー内に配置されるインジェクターと吸気通路部に取り付けられるインジェクターとを有し、少なくとも一つを主に内燃機関の高回転高負荷時に作動するインジェクターとする自動二輪車用の内燃機関の燃料噴射装置において、
前記エアクリーナーは車両後方且つやや下方に向けて延びたフレーム上に載置固定された燃料タンクの逆Ｕ字形下面に覆われて設けられ、
前記吸気通路部はエアクリーナー内に突設したラッパ状のファンネル部と内部にスロットルバルブを備えたスロットルボディ部と吸気ポートに連通するインシュレーター部を備え、
前記吸気通路部に取付けられるインジェクターをスロットルボディ部のスロットルバルブの下流に設けるとともに、
前記エアクリーナーに一体に突設し吸気通路の中心軸と交差するブラケットにより前記エアクリーナー内に配設されるインジェクターを前記吸気通路の中心軸に沿って配置し、
前記吸気通路のラッパ状のファンネル部近傍かつ該ファンネル部よりも上流位置から通路内に向けて燃料を噴射させたことを特徴とする自動二輪車用の内燃機関の燃料噴射装置。A plurality of injectors for injecting fuel into the passage of the intake passage portion that communicates the combustion chamber and the air cleaner are provided, and the plurality of injectors include an injector disposed in the air cleaner and an injector attached to the intake passage portion. In a fuel injection device for an internal combustion engine for a motorcycle , at least one of which is an injector that operates mainly at the time of high rotation and high load of the internal combustion engine,
The air cleaner is provided so as to be covered by an inverted U-shaped bottom surface of a fuel tank mounted and fixed on a frame extending rearward and slightly downward of the vehicle,
The intake passage portion includes a trumpet-like funnel portion protruding from an air cleaner, a throttle body portion having a throttle valve inside, and an insulator portion communicating with the intake port,
While providing an injector attached to the intake passage portion downstream of the throttle valve of the throttle body portion,
The injector disposed more to the inside air cleaner to a bracket which intersects the central axis of the projecting and the intake passage integrally with the air cleaner is arranged along the central axis of the intake passage,
A fuel injection device for an internal combustion engine for a motorcycle, wherein fuel is injected from the vicinity of a trumpet-shaped funnel portion of the intake passage and from a position upstream of the funnel portion into the passage.
JP12216594A 1994-06-03 1994-06-03 Fuel injection device for internal combustion engine Expired - Fee Related JP3690824B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12216594A JP3690824B2 (en) 1994-06-03 1994-06-03 Fuel injection device for internal combustion engine

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Application Number Priority Date Filing Date Title
JP12216594A JP3690824B2 (en) 1994-06-03 1994-06-03 Fuel injection device for internal combustion engine

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JP3690824B2 true JP3690824B2 (en) 2005-08-31

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