JP2004316518A - High-pressure fuel feeder - Google Patents

High-pressure fuel feeder Download PDF

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Publication number
JP2004316518A
JP2004316518A JP2003110261A JP2003110261A JP2004316518A JP 2004316518 A JP2004316518 A JP 2004316518A JP 2003110261 A JP2003110261 A JP 2003110261A JP 2003110261 A JP2003110261 A JP 2003110261A JP 2004316518 A JP2004316518 A JP 2004316518A
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Japan
Prior art keywords
pressure
fuel
pump
low
engine
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JP2003110261A
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Japanese (ja)
Inventor
Katsumi Mori
克己 森
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Denso Corp
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Denso Corp
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Priority to JP2003110261A priority Critical patent/JP2004316518A/en
Priority to US10/816,898 priority patent/US20040208753A1/en
Priority to EP04008866A priority patent/EP1469190A1/en
Priority to CNA2004100343845A priority patent/CN1538053A/en
Publication of JP2004316518A publication Critical patent/JP2004316518A/en
Withdrawn legal-status Critical Current

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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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/005—Arrangements of fuel feed-pumps with respect to fuel injection apparatus
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-pressure fuel feeder easily mounted on a vehicle by solving a difficulty of securing a space for mounting a fuel injection pump difficult to be miniaturized, which is provided with a low-pressure feed system, an amount adjustment system, and a high-pressure discharge system integrally, whereas it is necessary to be mounted near an engine since the high pressure pump of the high pressure discharge system is driven by an output of the engine. <P>SOLUTION: The low-pressure feed system 5, the amount adjusting system 7, and the high-pressure discharge system 3 are separately provided, and they are connected by a fuel piping 23 respectively. Since the size of the high-pressure discharge system 3 is small in comparison with the fuel injection pump, it becomes easy to secure a space for mounting it near the engine. On the other hand, the low-pressure feed system 5 and the amount adjusting system 7 can be mounted without any constraints, so they can be mounted by using the empty space of an engine room. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、燃料タンク内の燃料を高圧にしてコモンレールへ供給する高圧燃料供給装置に関するものである。
【０００２】
【従来の技術】
ディーゼルエンジン等に用いられる燃料噴射装置として、コモンレールを用いた蓄圧式燃料噴射装置が知られている。この蓄圧式燃料噴射装置は、高圧燃料を蓄えるコモンレールと、このコモンレールに蓄圧された高圧燃料を噴射するインジェクタと、燃料タンク内の燃料を高圧にしてコモンレールへ供給する高圧燃料供給装置とから構成される。
高圧燃料供給装置は、燃料タンク内の燃料を高圧ポンプへ供給するフィードポンプを有した低圧供給系と、フィードポンプから高圧ポンプへ送られる燃料の供給量を調整する燃料調量弁を有した調量系と、この調量された低圧燃料を高圧化してコモンレールへ高圧燃料を圧送供給する高圧ポンプを有した高圧吐出系とから構成されるものであり、これら低圧供給系、調量系、高圧吐出系は、燃料噴射ポンプとして一体に設けられている。なお、以下で言う燃料噴射ポンプとは、低圧供給系、調量系、高圧吐出系が一体に設けられたものである（特許文献１、特許文献２参照：この特許文献１、特許文献２は周知技術ではない）。
【０００３】
【特許文献１】
特願２００１−３５５８２１
【特許文献２】
特願２００２−３４７４３８
【０００４】
【発明が解決しようとする課題】
燃料噴射ポンプに搭載される高圧ポンプは、燃料を高圧に圧縮するために、過大な駆動トルクが要求される。このため、高圧ポンプが内燃機関（以下、エンジン）の出力によって駆動されるように、燃料噴射ポンプはエンジンに直接、もしくはエンジンの近傍に取り付けられる。
このように、燃料噴射ポンプは、エンジン近傍に取り付ける制約があるために、狭いエンジンルームのエンジン近傍に小型化が困難な燃料噴射ポンプを取り付けるスペースを確保するのは容易でない。
特に、近年では小型乗用車など、小型化されたエンジンが狭いエンジンルームに収容された車両等において、燃料噴射ポンプを含めたエンジン構成部を狭いエンジンルームに収容する要求があるが、小型化が困難な燃料噴射ポンプをエンジン近傍に取り付けるのは配置スペース上極めて困難である。
【０００５】
また、燃料噴射ポンプに搭載されるフィードポンプ、燃料調量弁、高圧ポンプは、燃料噴射ポンプの機種毎に設計される専用機である。このため、フィードポンプ、燃料調量弁、高圧ポンプのそれぞれのコストが高くなり、結果的に燃料噴射ポンプ（高圧燃料供給装置）のコストが高くなってしまう。
【０００６】
【発明の目的】
本発明は、上記の事情に鑑みてなされたものであり、その目的は、搭載性の自由度が大きく、且つコストを抑えることが可能な高圧燃料供給装置の提供にある。
【０００７】
【課題を解決するための手段】
〔請求項１の手段〕
請求項１の手段を採用する高圧燃料供給装置は、低圧供給系、調量系、高圧吐出系のそれぞれを独立させて別体に設け、低圧供給系、調量系、高圧吐出系のそれぞれを燃料配管で接続するものである。
このように、低圧供給系、調量系、高圧吐出系のそれぞれを別体に設けることで、独立して設けられた低圧供給系、調量系、高圧吐出系のそれぞれの体格を燃料噴射ポンプに比較して小さくできる。
【０００８】
エンジン近傍に取り付ける制約があるのは高圧ポンプだけである。このため、小型化が困難な燃料噴射ポンプに比較して体格の小さい高圧吐出系を取り付けるスペースをエンジンの近傍に確保するのは容易である。
そして、低圧供給系および調量系は搭載の制約を受けないため、空きスペースを利用して搭載することが可能である。
即ち、請求項１の手段を採用することにより従来に比較して高圧燃料供給装置の搭載性が格段に向上する。
【０００９】
また、フィードポンプ、燃料調量弁、高圧ポンプの全部、もしくは一部（例えば、フィードポンプ、または燃料調量弁、あるいはフィードポンプと燃料調量弁）に汎用機を用いることが可能になる。このため、フィードポンプ、燃料調量弁、高圧ポンプの合計コストを低く抑えることが可能になり、高圧燃料供給装置を安価にできる。
【００１０】
〔請求項２の手段〕
請求項２の手段を採用する高圧燃料供給装置は、低圧供給系と調量系とを一体に設け、高圧吐出系を独立した別体に設け、調量系と高圧吐出系を燃料配管で接続するものである。
このように、高圧吐出系を独立して設けることで、一体に設けた低圧供給系と調量系の体格を燃料噴射ポンプに比較して小さくできるとともに、別体の高圧吐出系の体格も燃料噴射ポンプに比較して小さくできる。
【００１１】
上述した請求項１の手段と同様、エンジン近傍に取り付ける制約があるのは高圧ポンプだけであるため、燃料噴射ポンプに比較して体格の小さい高圧吐出系を取り付けるスペースをエンジン近傍に確保するのは容易である。
一方、一体に設けた低圧供給系と調量系は搭載の制約を受けないため、空きスペースを利用して搭載することが可能になる。
即ち、請求項２の手段を採用することにより従来に比較して高圧燃料供給装置の搭載性が格段に向上する。
【００１２】
また、フィードポンプ、燃料調量弁、高圧ポンプの全部、もしくは一部（例えば、フィードポンプ、または燃料調量弁、あるいはフィードポンプと燃料調量弁）に汎用機を用いることが可能になる。このため、フィードポンプ、燃料調量弁、高圧ポンプの合計コストを低く抑えることが可能になり、高圧燃料供給装置を安価にできる。
【００１３】
〔請求項３の手段〕
請求項３の手段を採用する高圧燃料供給装置の燃料調量弁は、電気信号によって高圧ポンプへ燃料を送る燃料通路を開閉する電磁式燃料調量弁である。
このように、電磁式燃料調量弁を用いることにより、エンジンの出力を用いなくても作動できるため、自由な位置に燃料調量弁を搭載することができる。
【００１４】
〔請求項４の手段〕
請求項４の手段を採用する高圧燃料供給装置のフィードポンプは、電動モータにより駆動されるものである。
このように、フィードポンプを電動モータによって駆動することにより、エンジンの出力を用いなくてもフィードポンプを作動できるため、自由な位置にフィードポンプを搭載することができる。
【００１５】
〔請求項５の手段〕
請求項５の手段を採用する高圧燃料供給装置のフィードポンプは、ギヤ、チェーン等の動力伝達手段を介してエンジンまたは高圧ポンプにより駆動されるものである。
エンジン近傍もしくは高圧ポンプの近傍にフィードポンプの搭載スペースを確保できる場合は、エンジンまたは高圧ポンプの動力によってフィードポンプを駆動しても良い。
【００１６】
【発明の実施の形態】
本発明の実施の形態を、２つの実施例および変形例を用いて説明する。
〔第１実施例〕
第１実施例を図１を参照して説明する。なお、図１は蓄圧式燃料噴射装置に搭載される高圧燃料供給装置の概略図である。
【００１７】
蓄圧式燃料噴射装置は、高圧燃料を蓄えるコモンレール（図示しない）と、このコモンレールに蓄圧された高圧燃料をエンジン（図示しない）の各気筒毎に噴射する複数のインジェクタ（図示しない）と、燃料タンク１の燃料を高圧に圧縮してコモンレールへ供給する高圧燃料供給装置とから構成される。
この高圧燃料供給装置は、図１に示されるものであり、コモンレールへ高圧燃料を圧送供給する高圧ポンプ２を有する高圧吐出系３と、燃料タンク１の燃料を高圧ポンプ２へ供給するフィードポンプ４を有する低圧供給系５と、フィードポンプ４から高圧ポンプ２へ送られる燃料の供給量を調整する燃料調量弁６（ＳＣＶ）を有する調量系７とを具備する。
【００１８】
低圧供給系５は、フィードポンプ４の他にレギュレータバルブ８を備える。
フィードポンプ４は、トロコイドポンプ、ベーンポンプ、外歯歯車ポンプ、内歯歯車ポンプ等よりなり、燃料タンク１に蓄えられた燃料を燃料フィルタ９を介して吸い上げて、燃料調量弁６を介して高圧ポンプ２に供給するものである。この実施例のフィードポンプ４は、通電によって回転動力を発生する電動モータ（図示しない）により駆動されるものである。
レギュレータバルブ８は、フィードポンプ４の吐出側と供給側とを連通する燃料通路に配置されてフィードポンプ４の吐出圧が所定圧に上昇すると開弁して、フィードポンプ４の吐出圧が所定圧を超えないようにするものである。
【００１９】
調量系７に搭載される燃料調量弁６は、図示しないＥＣＵ（エンジン・コントロール・ユニットの略）から与えられる電気信号（ＯＮ−ＯＦＦ信号）によって高圧ポンプ２へ燃料を送る燃料通路を開閉して高圧ポンプ２への燃料供給量を制御する電磁式燃料調量弁である。
この燃料調量弁６が高圧ポンプ２へ送られる燃料供給量を制御することにより、高圧ポンプ２の吐出する燃料の吐出量が制御されて、コモンレールの燃料圧力が制御される。
【００２０】
高圧吐出系３は、高圧ポンプ２の他に、吸入弁１１と吐出弁１２を備える。
高圧ポンプ２は、エンジンによって駆動される１つまたは複数のプランジャポンプによって構成される。
この実施例の高圧ポンプ２は、エンジンの回転出力によって回転駆動されるカムシャフト１３に設けられてカムシャフト１３の回転軸芯に対して偏心回転するエキセンカム１４、このエキセンカム１４の周囲において回転自在に装着されたカムリング１５、このカムリング１５の外周平面にスプリング１６によって押し付けられた状態でシリンダ１７内を往復動するプランジャ１８を備える。
【００２１】
プランジャ１８が下降（回転中心側へ移動）する際は、加圧室１９の容積が拡張して加圧室１９の圧力が低下して吐出弁１２が閉弁するとともに、吸入弁１１が開弁してフィードポンプ４から供給されて燃料調量弁６で調量された燃料が加圧室１９内へ吸引される。
逆に、プランジャ１８が上昇（回転中心とは異なった側へ移動）する際は、加圧室１９の容積が縮小して加圧室１９の燃料が加圧されて吸入弁１１が閉弁する。そして、加圧室１９で加圧された燃料の圧力が所定圧力に達すると吐出弁１２が開弁して加圧室１９で加圧された高圧燃料がコモンレールへ向けて吐出される。
【００２２】
なお、高圧吐出系３に供給された燃料の一部は、オリフィス２１を介してカムリング１５の周囲を覆うカム室２２に供給されるようになっており、カム室２２の余剰燃料は、燃料リターン用の燃料配管２３を介して燃料タンク１に戻されるようになっている。
【００２３】
〔第１実施例の特徴〕
「従来の技術」および「発明が解決しようとする課題」の項でも説明したように、従来の高圧燃料供給装置は、高圧吐出系３、低圧供給系５、調量系７が燃料噴射ポンプとして一体に設けられていた。しかし、高圧ポンプ２がエンジン出力によって駆動されるものであるため、燃料噴射ポンプはエンジンに直接、もしくはエンジン近傍に取り付けられる必要がある。
しかし、狭いエンジンルームのエンジン近傍に小型化が困難な燃料噴射ポンプを取り付けるスペースを確保するのは容易でない。
【００２４】
そこで、この実施例の高圧燃料供給装置は、図１の破線で示すように、低圧供給系５、調量系７、高圧吐出系３のそれぞれを独立した別体に設け、低圧供給系５、調量系７、高圧吐出系３のそれぞれを燃料配管２３で接続した。
このように、低圧供給系５、調量系７、高圧吐出系３のそれぞれを別体に設けることで、独立して設けられた低圧供給系５、調量系７、高圧吐出系３の各体格を燃料噴射ポンプに比較して小さくできる。
【００２５】
高圧ポンプ２のカムシャフト１３がエンジンによって駆動されるものであるため、高圧吐出系３はエンジン近傍に取り付けスペースを必要とする。別な言い方をすれば、エンジン近傍に取り付けスペースが必要になるのは高圧ポンプ２を搭載した高圧吐出系３だけである。
高圧吐出系３は、燃料噴射ポンプに比較して体格が小さいため、高圧吐出系３を取り付けるスペースをエンジン近傍に確保するのは、小型化が困難な燃料噴射ポンプの搭載スペースをエンジン近傍に確保するよりも格段に容易である。
【００２６】
一方、フィードポンプ４は電動モータによって駆動されるため、フィードポンプ４を自由な位置に搭載することができる。また、燃料調量弁６として電磁式燃料調量弁を用いることにより、燃料調量弁６を自由な位置に搭載することができる。
このように、低圧供給系５および調量系７は搭載の制約を受けないため、エンジンルームの空きスペースを利用して搭載することが可能である。
即ち、本実施例の高圧燃料供給装置は、従来に比較して車両搭載性が格段に向上する。
【００２７】
また、フィードポンプ４、燃料調量弁６、高圧ポンプ２の全部（もしくは一部）に汎用機を用いることが可能になる。このため、フィードポンプ４、燃料調量弁６、高圧ポンプ２の合計コストを低く抑えることが可能になり、高圧燃料供給装置を安価にできる。
【００２８】
〔第２実施例〕
図２を参照して第２実施例を説明する。なお、上記第１実施例と同一符号は同一機能物を示すものである。
上記の第１実施例では、低圧供給系５、調量系７、高圧吐出系３のそれぞれを独立して別体に設けた例を示した。
これに対し、この第２実施例の高圧燃料供給装置は、図２の破線に示すように、低圧供給系５と調量系７とを一体化して低圧調量系２４としたものである。高圧吐出系３は、第１実施例と同様に別体に設けたものであり、低圧調量系２４における調量系７と高圧吐出系３とを燃料配管２３で接続したものである。
【００２９】
このように設けることで、第１実施例と同様、燃料噴射ポンプに比較して体格の小さい高圧吐出系３のみをエンジン近傍に取り付ければ良く、高圧吐出系３を取り付けるスペースをエンジン近傍に確保するのが容易になる。
一方、低圧供給系５と調量系７を一体に設けた低圧調量系２４は、搭載の制約を受けないため、空きスペースを利用して搭載することが可能になる。
即ち、この第２実施例の高圧燃料供給装置も、第１実施例と同様、車両搭載性に優れる。
【００３０】
また、第１実施例と同様、フィードポンプ４、燃料調量弁６、高圧ポンプ２の全部（もしくは一部）に汎用機を用いることが可能である。このため、フィードポンプ４、燃料調量弁６、高圧ポンプ２の合計コストを低く抑えることが可能になり、高圧燃料供給装置を安価にできる。
【００３１】
〔変形例〕
上記の実施例では、レギュレータバルブ８で溢流した燃料をフィードポンプ４の吸込側へ戻す例を示したが、図３に示すように、レギュレータバルブ８で溢流した燃料を燃料タンク１へ戻すようにしても良い。
上記の実施例では、フィードポンプ４の吸込側に燃料フィルタ９を配置した例を示したが、図３に示すように、フィードポンプ４と燃料調量弁６との間に燃料フィルタ９を配置しても良い。
【００３２】
上記の実施例では、フィードポンプ４をどこにでも搭載可能とするために電動モータで駆動する例を示したが、エンジン近傍もしくは高圧ポンプ２の近傍にフィードポンプ４の搭載スペースを確保できる場合は、その場所にフィードポンプ４を配置し、エンジンまたは高圧ポンプ２のトルクをギヤ、チェーン等の動力伝達手段を介してフィードポンプ４に伝えてフィードポンプ４を駆動しても良い。
【図面の簡単な説明】
【図１】高圧燃料供給装置の概略図である（第１実施例）。
【図２】高圧燃料供給装置の概略図である（第２実施例）。
【図３】高圧燃料供給装置の概略図である（変形例）。
【符号の説明】
１ 燃料タンク
２ 高圧ポンプ
３ 高圧吐出系
４ フィードポンプ
５ 低圧供給系
６ 燃料調量弁（電磁式燃料調量弁）
７ 調量系
２３ 燃料配管
２４ 低圧調量系（低圧供給系と調量系を一体にしたもの）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a high-pressure fuel supply device that supplies fuel to a common rail at a high pressure in a fuel tank.
[0002]
[Prior art]
As a fuel injection device used for a diesel engine or the like, an accumulator type fuel injection device using a common rail is known. This accumulator type fuel injection device is composed of a common rail that stores high-pressure fuel, an injector that injects high-pressure fuel stored in the common rail, and a high-pressure fuel supply device that supplies fuel to the common rail at a high pressure in the fuel tank. You.
The high-pressure fuel supply device includes a low-pressure supply system having a feed pump for supplying fuel in a fuel tank to a high-pressure pump, and a fuel adjustment valve having a fuel metering valve for adjusting a supply amount of fuel sent from the feed pump to the high-pressure pump. And a high-pressure discharge system having a high-pressure pump for supplying the high-pressure fuel to the common rail by pressurizing the metered low-pressure fuel. The low-pressure supply system, the metering system, The discharge system is provided integrally as a fuel injection pump. In addition, the fuel injection pump referred to below is one in which a low-pressure supply system, a metering system, and a high-pressure discharge system are integrally provided (see Patent Literature 1 and Patent Literature 2: Patent Literature 1 and Patent Literature 2). Not a well-known technique).
[0003]
[Patent Document 1]
Japanese Patent Application 2001-355821
[Patent Document 2]
Japanese Patent Application No. 2002-347438
[0004]
[Problems to be solved by the invention]
A high-pressure pump mounted on a fuel injection pump requires an excessive drive torque to compress fuel to a high pressure. For this reason, the fuel injection pump is mounted directly on the engine or in the vicinity of the engine such that the high-pressure pump is driven by the output of the internal combustion engine (hereinafter, engine).
As described above, since the fuel injection pump is restricted to be mounted near the engine, it is not easy to secure a space for mounting the fuel injection pump, which is difficult to downsize, near the engine in a narrow engine room.
In particular, in recent years, in a vehicle or the like in which a miniaturized engine is housed in a narrow engine room such as a small passenger car, there is a demand for housing an engine component including a fuel injection pump in a narrow engine room, but miniaturization is difficult. It is extremely difficult to install a suitable fuel injection pump in the vicinity of the engine because of the arrangement space.
[0005]
A feed pump, a fuel metering valve, and a high-pressure pump mounted on the fuel injection pump are dedicated machines designed for each type of the fuel injection pump. Therefore, the cost of each of the feed pump, the fuel metering valve, and the high-pressure pump increases, and as a result, the cost of the fuel injection pump (high-pressure fuel supply device) increases.
[0006]
[Object of the invention]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a high-pressure fuel supply device that has a large degree of freedom in mountability and can reduce costs.
[0007]
[Means for Solving the Problems]
[Means of claim 1]
In the high-pressure fuel supply device employing the means of claim 1, the low-pressure supply system, the metering system, and the high-pressure discharge system are provided separately and separately, and each of the low-pressure supply system, the metering system, and the high-pressure discharge system is provided separately. It is connected by a fuel pipe.
In this way, by separately providing the low-pressure supply system, the metering system, and the high-pressure discharge system, the physics of the independently provided low-pressure supply system, the metering system, and the high-pressure discharge system can be reduced by the fuel injection pump. Can be smaller than
[0008]
Only high-pressure pumps have the restriction of being mounted near the engine. For this reason, it is easy to secure a space near the engine where a high-pressure discharge system, which is smaller in size than a fuel injection pump whose size is difficult to reduce, is installed.
Since the low-pressure supply system and the metering system are not restricted by the mounting, it is possible to mount the system using an empty space.
That is, by adopting the means of claim 1, the mountability of the high-pressure fuel supply device is remarkably improved as compared with the related art.
[0009]
Further, a general-purpose machine can be used for all or a part of the feed pump, the fuel metering valve, and the high-pressure pump (for example, the feed pump or the fuel metering valve, or the feed pump and the fuel metering valve). Therefore, the total cost of the feed pump, the fuel metering valve, and the high-pressure pump can be kept low, and the high-pressure fuel supply device can be made inexpensive.
[0010]
[Means of Claim 2]
In the high-pressure fuel supply device employing the means of claim 2, the low-pressure supply system and the metering system are integrally provided, the high-pressure discharge system is provided as an independent unit, and the metering system and the high-pressure discharge system are connected by a fuel pipe. Is what you do.
As described above, by independently providing the high-pressure discharge system, the physique of the low-pressure supply system and the metering system provided integrally can be made smaller than that of the fuel injection pump, and the physique of the separate high-pressure discharge system can be reduced. The size can be reduced compared to the injection pump.
[0011]
Similar to the above-described means of the first aspect, only the high-pressure pump is restricted in the vicinity of the engine. Therefore, it is difficult to secure a space for installing the high-pressure discharge system having a smaller size than the fuel injection pump near the engine. Easy.
On the other hand, since the low-pressure supply system and the metering system provided integrally are not restricted by the mounting, the mounting can be performed by using the empty space.
That is, by adopting the means of the second aspect, the mountability of the high-pressure fuel supply device is significantly improved as compared with the related art.
[0012]
Further, a general-purpose machine can be used for all or a part of the feed pump, the fuel metering valve, and the high-pressure pump (for example, the feed pump or the fuel metering valve, or the feed pump and the fuel metering valve). Therefore, the total cost of the feed pump, the fuel metering valve, and the high-pressure pump can be kept low, and the high-pressure fuel supply device can be made inexpensive.
[0013]
[Means of Claim 3]
The fuel metering valve of the high-pressure fuel supply device employing the means of claim 3 is an electromagnetic fuel metering valve that opens and closes a fuel passage that sends fuel to the high-pressure pump by an electric signal.
As described above, since the electromagnetic fuel metering valve can be operated without using the output of the engine, the fuel metering valve can be mounted at any position.
[0014]
[Means of Claim 4]
The feed pump of the high-pressure fuel supply device employing the means of claim 4 is driven by an electric motor.
In this way, by driving the feed pump by the electric motor, the feed pump can be operated without using the output of the engine, so that the feed pump can be mounted at any position.
[0015]
[Means of claim 5]
The feed pump of the high-pressure fuel supply device adopting the means of claim 5 is driven by an engine or a high-pressure pump via power transmission means such as gears and chains.
If a space for mounting the feed pump can be secured near the engine or the high-pressure pump, the feed pump may be driven by the power of the engine or the high-pressure pump.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described using two examples and modifications.
[First embodiment]
A first embodiment will be described with reference to FIG. FIG. 1 is a schematic view of a high-pressure fuel supply device mounted on the accumulator type fuel injection device.
[0017]
The pressure-accumulation fuel injection device includes a common rail (not shown) for storing high-pressure fuel, a plurality of injectors (not shown) for injecting high-pressure fuel stored in the common rail into each cylinder of an engine (not shown), and a fuel tank. And a high-pressure fuel supply device for compressing the fuel to a high pressure and supplying it to the common rail.
This high-pressure fuel supply device is shown in FIG. 1 and includes a high-pressure discharge system 3 having a high-pressure pump 2 for supplying high-pressure fuel to a common rail under pressure, and a feed pump 4 for supplying fuel from a fuel tank 1 to the high-pressure pump 2. And a metering system 7 having a fuel metering valve 6 (SCV) for adjusting the amount of fuel supplied from the feed pump 4 to the high-pressure pump 2.
[0018]
The low-pressure supply system 5 includes a regulator valve 8 in addition to the feed pump 4.
The feed pump 4 includes a trochoid pump, a vane pump, an external gear pump, an internal gear pump, and the like. The feed pump 4 sucks up fuel stored in the fuel tank 1 through a fuel filter 9 and pressurizes the fuel through a fuel metering valve 6. This is supplied to the pump 2. The feed pump 4 of this embodiment is driven by an electric motor (not shown) that generates rotational power when energized.
The regulator valve 8 is disposed in a fuel passage communicating the discharge side and the supply side of the feed pump 4, and is opened when the discharge pressure of the feed pump 4 rises to a predetermined pressure. Not to exceed.
[0019]
The fuel metering valve 6 mounted on the metering system 7 opens and closes a fuel passage for sending fuel to the high-pressure pump 2 by an electric signal (ON-OFF signal) given from an ECU (abbreviation of engine control unit) not shown. This is an electromagnetic fuel metering valve that controls the amount of fuel supplied to the high-pressure pump 2.
By controlling the amount of fuel supplied to the high-pressure pump 2 by the fuel metering valve 6, the amount of fuel discharged from the high-pressure pump 2 is controlled, and the fuel pressure of the common rail is controlled.
[0020]
The high-pressure discharge system 3 includes a suction valve 11 and a discharge valve 12 in addition to the high-pressure pump 2.
The high-pressure pump 2 is constituted by one or a plurality of plunger pumps driven by an engine.
The high-pressure pump 2 of this embodiment is provided on a camshaft 13 that is driven to rotate by the rotation output of an engine, and is an eccentric cam 14 that rotates eccentrically with respect to the rotation axis of the camshaft 13, and is rotatable around the eccentric cam 14. A cam ring 15 is provided, and a plunger 18 that reciprocates in a cylinder 17 while being pressed by a spring 16 against an outer peripheral plane of the cam ring 15 is provided.
[0021]
When the plunger 18 descends (moves toward the center of rotation), the volume of the pressurizing chamber 19 expands, the pressure in the pressurizing chamber 19 decreases, the discharge valve 12 closes, and the suction valve 11 opens. Then, the fuel supplied from the feed pump 4 and metered by the fuel metering valve 6 is sucked into the pressurizing chamber 19.
Conversely, when the plunger 18 moves up (moves to a side different from the rotation center), the volume of the pressurizing chamber 19 is reduced, the fuel in the pressurizing chamber 19 is pressurized, and the suction valve 11 is closed. . When the pressure of the fuel pressurized in the pressurizing chamber 19 reaches a predetermined pressure, the discharge valve 12 is opened, and the high-pressure fuel pressurized in the pressurizing chamber 19 is discharged toward the common rail.
[0022]
A part of the fuel supplied to the high-pressure discharge system 3 is supplied to a cam chamber 22 that covers the periphery of the cam ring 15 through an orifice 21. The fuel tank 1 is returned to the fuel tank 1 through a fuel pipe 23 for use.
[0023]
[Features of the first embodiment]
As described in the “Prior art” and “Problems to be solved by the invention”, in the conventional high-pressure fuel supply device, the high-pressure discharge system 3, the low-pressure supply system 5, and the metering system 7 are used as fuel injection pumps. It was provided integrally. However, since the high-pressure pump 2 is driven by the engine output, the fuel injection pump needs to be mounted directly on the engine or near the engine.
However, it is not easy to secure a space for mounting a fuel injection pump, which is difficult to downsize, near the engine in a narrow engine room.
[0024]
Therefore, in the high-pressure fuel supply device of this embodiment, as shown by a broken line in FIG. 1, the low-pressure supply system 5, the metering system 7, and the high-pressure discharge system 3 are provided separately and separately. Each of the metering system 7 and the high-pressure discharge system 3 was connected by a fuel pipe 23.
As described above, by separately providing the low-pressure supply system 5, the metering system 7, and the high-pressure discharge system 3, each of the independently provided low-pressure supply system 5, the metering system 7, and the high-pressure discharge system 3 is provided. The physique can be made smaller than that of the fuel injection pump.
[0025]
Since the camshaft 13 of the high-pressure pump 2 is driven by the engine, the high-pressure discharge system 3 requires an installation space near the engine. In other words, only the high-pressure discharge system 3 equipped with the high-pressure pump 2 requires an installation space near the engine.
Since the high-pressure discharge system 3 is smaller in size than the fuel injection pump, the space for mounting the high-pressure discharge system 3 is secured near the engine. The space for mounting the fuel injection pump, which is difficult to downsize, is secured near the engine. It is much easier than doing.
[0026]
On the other hand, since the feed pump 4 is driven by the electric motor, the feed pump 4 can be mounted at any position. Further, by using an electromagnetic fuel metering valve as the fuel metering valve 6, the fuel metering valve 6 can be mounted at any position.
As described above, since the low-pressure supply system 5 and the metering system 7 are not restricted by the mounting, they can be mounted by using the empty space in the engine room.
That is, the high-pressure fuel supply device of the present embodiment is significantly improved in vehicle mountability as compared with the related art.
[0027]
Further, a general-purpose machine can be used for all (or a part) of the feed pump 4, the fuel metering valve 6, and the high-pressure pump 2. For this reason, the total cost of the feed pump 4, the fuel metering valve 6, and the high-pressure pump 2 can be kept low, and the high-pressure fuel supply device can be made inexpensive.
[0028]
[Second embodiment]
A second embodiment will be described with reference to FIG. The same reference numerals as those in the first embodiment denote the same functions.
In the above-described first embodiment, an example is shown in which the low-pressure supply system 5, the metering system 7, and the high-pressure discharge system 3 are independently provided separately.
On the other hand, in the high-pressure fuel supply device of the second embodiment, as shown by the broken line in FIG. 2, the low-pressure supply system 5 and the adjustment system 7 are integrated into a low-pressure adjustment system 24. The high-pressure discharge system 3 is provided separately as in the first embodiment, and the metering system 7 in the low-pressure metering system 24 and the high-pressure discharge system 3 are connected by a fuel pipe 23.
[0029]
With this arrangement, as in the first embodiment, only the high-pressure discharge system 3 having a smaller size than the fuel injection pump needs to be mounted near the engine, and a space for mounting the high-pressure discharge system 3 is secured near the engine. Will be easier.
On the other hand, the low-pressure metering system 24 in which the low-pressure supply system 5 and the metering system 7 are integrally provided is not restricted by mounting, and can be mounted using an empty space.
That is, the high-pressure fuel supply device of the second embodiment is also excellent in vehicle mountability, as in the first embodiment.
[0030]
Also, as in the first embodiment, a general-purpose machine can be used for all (or a part) of the feed pump 4, the fuel metering valve 6, and the high-pressure pump 2. For this reason, the total cost of the feed pump 4, the fuel metering valve 6, and the high-pressure pump 2 can be kept low, and the high-pressure fuel supply device can be made inexpensive.
[0031]
(Modification)
In the above-described embodiment, an example in which the fuel overflowed by the regulator valve 8 is returned to the suction side of the feed pump 4 has been described. However, the fuel overflowed by the regulator valve 8 is returned to the fuel tank 1 as shown in FIG. You may do it.
In the above embodiment, the example in which the fuel filter 9 is disposed on the suction side of the feed pump 4 is shown. However, the fuel filter 9 is disposed between the feed pump 4 and the fuel metering valve 6 as shown in FIG. You may.
[0032]
In the above-described embodiment, an example is shown in which the feed pump 4 is driven by an electric motor so that the feed pump 4 can be mounted anywhere. However, if the mounting space for the feed pump 4 can be ensured near the engine or near the high-pressure pump 2, The feed pump 4 may be arranged at that location, and the feed pump 4 may be driven by transmitting the torque of the engine or the high-pressure pump 2 to the feed pump 4 via power transmission means such as gears and chains.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a high-pressure fuel supply device (first embodiment).
FIG. 2 is a schematic view of a high-pressure fuel supply device (second embodiment).
FIG. 3 is a schematic view of a high-pressure fuel supply device (modification).
[Explanation of symbols]
Reference Signs List 1 fuel tank 2 high-pressure pump 3 high-pressure discharge system 4 feed pump 5 low-pressure supply system 6 fuel metering valve (electromagnetic fuel metering valve)
7 Metering system 23 Fuel piping 24 Low-pressure metering system (integrating low-pressure supply system and metering system)

Claims (5)

内燃機関の出力トルクによって駆動され、高圧燃料を蓄えるコモンレールへ高圧燃料を圧送供給する高圧ポンプを有する高圧吐出系と、
燃料タンク内の燃料を前記高圧ポンプへ供給するフィードポンプを有する低圧供給系と、
前記フィードポンプから前記高圧ポンプへ送られる燃料の供給量を調整する燃料調量弁を有する調量系とを具備し、
前記低圧供給系、前記調量系、前記高圧吐出系のそれぞれを独立した別体に設け、前記低圧供給系、前記調量系、前記高圧吐出系のそれぞれを燃料配管で接続して構成される高圧燃料供給装置。A high-pressure discharge system having a high-pressure pump driven by the output torque of the internal combustion engine to supply high-pressure fuel to a common rail that stores high-pressure fuel;
A low-pressure supply system having a feed pump that supplies fuel in a fuel tank to the high-pressure pump;
A metering system having a fuel metering valve that adjusts the amount of fuel supplied from the feed pump to the high-pressure pump,
The low-pressure supply system, the metering system, and the high-pressure discharge system are provided separately and separately, and each of the low-pressure supply system, the metering system, and the high-pressure discharge system is connected by a fuel pipe. High pressure fuel supply. 内燃機関の出力トルクによって駆動され、高圧燃料を蓄えるコモンレールへ高圧燃料を圧送供給する高圧ポンプを有する高圧吐出系と、
燃料タンク内の燃料を前記高圧ポンプへ供給するフィードポンプを有する低圧供給系と、
前記フィードポンプから前記高圧ポンプへ送られる燃料の供給量を調整する燃料調量弁を有する調量系とを具備し、
前記低圧供給系と前記調量系とを一体に設け、前記高圧吐出系を独立した別体に設け、前記調量系と前記高圧吐出系を燃料配管で接続して構成される高圧燃料供給装置。A high-pressure discharge system having a high-pressure pump driven by the output torque of the internal combustion engine to supply high-pressure fuel to a common rail that stores high-pressure fuel;
A low-pressure supply system having a feed pump that supplies fuel in a fuel tank to the high-pressure pump;
A metering system having a fuel metering valve that adjusts the amount of fuel supplied from the feed pump to the high-pressure pump,
A high-pressure fuel supply device configured by integrally providing the low-pressure supply system and the metering system, separately providing the high-pressure discharge system, and connecting the metering system and the high-pressure discharge system by a fuel pipe; . 請求項１または請求項２に記載の高圧燃料供給装置において、
前記燃料調量弁は、電気信号によって前記高圧ポンプへ燃料を送る燃料通路を開閉する電磁式燃料調量弁であることを特徴とする高圧燃料供給装置。The high-pressure fuel supply device according to claim 1 or 2,
The high-pressure fuel supply device is characterized in that the fuel metering valve is an electromagnetic fuel metering valve that opens and closes a fuel passage that sends fuel to the high-pressure pump by an electric signal. 請求項１〜請求項３のいずれかに記載の高圧燃料供給装置において、
前記フィードポンプは、電動モータにより駆動されることを特徴とする高圧燃料供給装置。The high-pressure fuel supply device according to any one of claims 1 to 3,
The high-pressure fuel supply device, wherein the feed pump is driven by an electric motor. 請求項１〜請求項３のいずれかに記載の高圧燃料供給装置において、
前記フィードポンプは、ギヤ、チェーン等の動力伝達手段を介して前記内燃機関または前記高圧ポンプにより駆動されることを特徴とする高圧燃料供給装置。The high-pressure fuel supply device according to any one of claims 1 to 3,
The high-pressure fuel supply device is characterized in that the feed pump is driven by the internal combustion engine or the high-pressure pump via power transmission means such as a gear or a chain.
JP2003110261A 2003-04-15 2003-04-15 High-pressure fuel feeder Withdrawn JP2004316518A (en)

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US10/816,898 US20040208753A1 (en) 2003-04-15 2004-04-05 High-pressure fuel supplying apparatus
EP04008866A EP1469190A1 (en) 2003-04-15 2004-04-14 High-pressure fuel supplying apparatus
CNA2004100343845A CN1538053A (en) 2003-04-15 2004-04-15 High-pressure fuel supply devcie

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