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JP2009257200A - Fuel supplying device - Google Patents

Fuel supplying device Download PDF

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Publication number
JP2009257200A
JP2009257200A JP2008107539A JP2008107539A JP2009257200A JP 2009257200 A JP2009257200 A JP 2009257200A JP 2008107539 A JP2008107539 A JP 2008107539A JP 2008107539 A JP2008107539 A JP 2008107539A JP 2009257200 A JP2009257200 A JP 2009257200A
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Japan
Prior art keywords
fuel
port
pressure
pump
low
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JP2008107539A
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Japanese (ja)
Inventor
Kazuya Kubota
一哉 久保田
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Bosch Corp
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Bosch Corp
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Priority to JP2008107539A priority Critical patent/JP2009257200A/en
Priority to PCT/JP2008/069874 priority patent/WO2009128176A1/en
Publication of JP2009257200A publication Critical patent/JP2009257200A/en
Pending 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0029—Pressure regulator in the low pressure fuel system
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized and low-cost fuel supplying device. <P>SOLUTION: The fuel supplying device 1 applies pressure on and discharges fuel F by a feed pump 3 from a fuel tank 2. The feed pump 3 is provided with a valve device 30 provided with a cylinder body 31 equipped with a first port 30A connected with a fuel exit side port 3B and second and third ports 30B, 30C connected with a fuel entrance side port 3A. The second port 30B is opened and closed in accordance with the fuel pressure of the first port 30A by a piston valve member 32 and a spring member 33 installed inside the cylinder body 31 to adjust the pressure of the fuel exit side port 3B and discharge the fuel pressure of the third port 30C to the first port 30A in case the fuel pressure of the third port 30C exceeds the fuel pressure of the first port 30A by a check valve mechanism 34 provided inside the piston valve member 32. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、燃料噴射装置のための燃料供給装置に関する。   The present invention relates to a fuel supply device for a fuel injection device.

例えば、内燃機関用のコモンレール式燃料噴射装置は、燃料タンク内の燃料をフィードポンプによって高圧ポンプに圧送するための燃料供給装置を備えている。このような目的で用いられている燃料供給装置のフィードポンプには、例えば特許文献１、２に記載されているように、通常、圧送側に許容外の高圧が生じた際インテーク側に燃料を戻す安全弁を配設すると共に、プライミングポンプ等により燃料が供給された際この燃料がフィードポンプを迂回するようにするためのバイパス弁を配設している。
特開平１１−８２２１３号公報 特開平１１−２８０６０４号公報 For example, a common rail fuel injection device for an internal combustion engine includes a fuel supply device for pumping fuel in a fuel tank to a high pressure pump by a feed pump. For example, as described in Patent Documents 1 and 2, a feed pump of a fuel supply device used for such a purpose normally supplies fuel to the intake side when an unacceptable high pressure occurs on the pumping side. A return valve is provided, and a bypass valve is provided for bypassing the feed pump when fuel is supplied by a priming pump or the like.
JP-A-11-82213 Japanese Patent Laid-Open No. 11-280604

燃料供給装置のフィードポンプにこれらの弁装置を設けようとすると、上述した従来技術では、これらの弁装置は各々フィードポンプのインテーク側とアウトレット側とを結ぶ通路に設置される必要があるため、製品の寸法、形状面で設計上の制約を受けることとなり、設計の自由度が小さくなってコストの低減を阻害する一要因となっていた。   In order to provide these valve devices in the feed pump of the fuel supply device, in the above-described conventional technology, these valve devices need to be installed in a passage connecting the intake side and the outlet side of the feed pump. Design constraints were imposed on the dimensions and shape of the product, and the design freedom was reduced, which was one factor that hindered cost reduction.

本発明の目的は、従来技術における上述の問題点を解決することができる燃料供給装置を提供することにある。   The objective of this invention is providing the fuel supply apparatus which can solve the above-mentioned problem in a prior art.

上記課題を解決するための本発明の特徴は、燃料タンクからの燃料をフィードポンプによって加圧して出力するように構成された燃料供給装置において、前記フィードポンプの燃料入口側ポートと燃料出口側ポートとに接続されている弁装置を備えており、該弁装置が、前記燃料出口側ポートに接続された第１ポートと前記燃料入口側ポートに接続された第２及び第３ポートとを有するシリンダ本体と、該シリンダ本体内に前記第１ポートの燃料圧を受圧すると共に前記第２ポートを開閉できるように収容されたピストン弁部材と、該ピストン弁部材が前記第１ポートの燃料圧力に応じて前記第２ポートを開閉できるよう該ピストン弁部材をばね付勢するためのばね部材と、前記第３ポートの燃料圧力が前記第１ポートの燃料圧力より大きくなった場合に前記第３ポートの燃料圧力を前記第１ポートに逃すため前記ピストン弁部材内に設けられた逆止弁機構とを備えて成っている点にある。   A feature of the present invention for solving the above-described problem is that, in a fuel supply apparatus configured to pressurize and output fuel from a fuel tank by a feed pump, a fuel inlet side port and a fuel outlet side port of the feed pump And a cylinder having a first port connected to the fuel outlet side port and second and third ports connected to the fuel inlet side port. A main body, a piston valve member accommodated in the cylinder main body so as to receive the fuel pressure of the first port and open and close the second port, and the piston valve member according to the fuel pressure of the first port A spring member for biasing the piston valve member so that the second port can be opened and closed, and the fuel pressure of the third port is greater than the fuel pressure of the first port. Certain fuel pressure in the third port in that is made and a check valve mechanism provided in the piston valve in member for escape to the first port when the Tsu.

本発明によれば、弁装置の単体化が図られるので、小型化が現実でき、コストも低減できる。   According to the present invention, since the valve device can be made simple, downsizing can be realized and the cost can be reduced.

以下、本発明による燃料供給装置の実施の形態の一例を図面を参照して説明する。   Hereinafter, an example of an embodiment of a fuel supply apparatus according to the present invention will be described with reference to the drawings.

図１は、本発明による燃料供給装置の実施の形態の一例を示す構成図である。燃料供給装置１は、コモンレール１０１に高圧燃料を供給するための高圧ポンプ１０２に比較的低圧の燃料を供給するための装置であり、燃料タンク２と、燃料タンク２内の燃料Ｆを加圧して高圧ポンプ１０２側へ出力するための低圧ポンプ（フィードポンプ）３とを備えている。   FIG. 1 is a configuration diagram showing an example of an embodiment of a fuel supply apparatus according to the present invention. The fuel supply device 1 is a device for supplying a relatively low-pressure fuel to a high-pressure pump 102 for supplying high-pressure fuel to the common rail 101, and pressurizes the fuel tank 2 and the fuel F in the fuel tank 2. And a low pressure pump (feed pump) 3 for outputting to the high pressure pump 102 side.

低圧ポンプ３の燃料入口側ポート３Ａと燃料タンク２との間にはフィルタ４を備えた燃料供給路５が設けられており、フィルタ４でゴミ等が除去された燃料が燃料供給路５を通って低圧ポンプ３に送られる構成となっている。符号６で示されるのは、フィルタ交換などにより低圧系のラインに空気が入ってしまった場合に、この空気を除去するために手動で燃料を送り込むために使用される手動ポンプ（プライミングポンプ）である。   A fuel supply path 5 having a filter 4 is provided between the fuel inlet side port 3 A of the low pressure pump 3 and the fuel tank 2, and fuel from which dust or the like has been removed by the filter 4 passes through the fuel supply path 5. Thus, it is configured to be sent to the low-pressure pump 3. Reference numeral 6 indicates a manual pump (priming pump) used to manually feed fuel in order to remove air when air enters the low-pressure system line due to filter replacement or the like. is there.

低圧ポンプ３の燃料出口側ポート３Ｂと高圧ポンプ１０２の吸入ポート１０２Ａとの間には、低圧ポンプ３から供給される比較的低圧の供給燃料を高圧ポンプ１０２に送給するための燃料送給路７が配設されている。燃料送給路７には、低圧ポンプ３から送り出された燃料中のゴミを除去するためのフィルタ８、及び高圧ポンプ１０２に供給する供給燃料の流量を制御するために比例電磁弁を用いて構成された制御弁９が設けられており、制御弁９により流量制御された供給燃料が逆止弁１０を介して高圧ポンプ１０２の吸入ポート１０２Ａからそのシリンダ室１０２Ｂ内に供給される構成となっている。制御弁９は図示しない制御ユニットにより制御され、コモンレール１０１内のレール圧が所与の目標レール圧となるよう低圧燃料の流量が制御される。   Between the fuel outlet side port 3 </ b> B of the low pressure pump 3 and the suction port 102 </ b> A of the high pressure pump 102, a fuel supply path for supplying relatively high pressure supply fuel supplied from the low pressure pump 3 to the high pressure pump 102. 7 is disposed. The fuel supply path 7 is configured by using a filter 8 for removing dust in the fuel sent from the low pressure pump 3 and a proportional solenoid valve for controlling the flow rate of the supplied fuel supplied to the high pressure pump 102. The control fuel 9 is provided, and the supply fuel whose flow rate is controlled by the control valve 9 is supplied from the suction port 102A of the high-pressure pump 102 into the cylinder chamber 102B via the check valve 10. Yes. The control valve 9 is controlled by a control unit (not shown), and the flow rate of the low-pressure fuel is controlled so that the rail pressure in the common rail 101 becomes a given target rail pressure.

制御弁９の燃料入口側の低圧燃料の圧力を所定の値に維持する目的で、燃料送給路７には燃料調圧弁１１が接続されている。図１に示した燃料供給装置１では、フィルタ８と制御弁９との間の燃料送給路７に、燃料調圧弁１１の受圧ポート１１Ａが配管１２によって接続されている。燃料調圧弁１１は、受圧ポート１１Ａの低圧燃料の圧力が所定レベルを超えた場合にそのオーバーフローポート１１Ｂから低圧燃料をオーバーフローさせ、これにより制御弁９の入口側の低圧燃料の圧力が、略所定の一定圧力に維持されるように動作する構成となっている。オーバーフローポート１１Ｂからのオーバーフロー低圧燃料は、ドレイン配管１３を通って燃料タンク２内に戻される。   For the purpose of maintaining the pressure of the low-pressure fuel on the fuel inlet side of the control valve 9 at a predetermined value, a fuel pressure regulating valve 11 is connected to the fuel feed path 7. In the fuel supply device 1 shown in FIG. 1, a pressure receiving port 11 </ b> A of a fuel pressure regulating valve 11 is connected to a fuel supply path 7 between a filter 8 and a control valve 9 by a pipe 12. The fuel pressure regulating valve 11 causes the low pressure fuel to overflow from the overflow port 11B when the pressure of the low pressure fuel in the pressure receiving port 11A exceeds a predetermined level, whereby the pressure of the low pressure fuel on the inlet side of the control valve 9 is substantially predetermined. It is the structure which operate | moves so that it may be maintained at the fixed pressure of. The overflow low-pressure fuel from the overflow port 11B is returned into the fuel tank 2 through the drain pipe 13.

燃料調圧弁１１は、さらに、低圧ポンプ３から送られてくる燃料を潤滑油として取り出すための取出しポート１１Ｃを有しており、取出しポート１１Ｃから取り出された燃料は、オリフィス１４を備えた潤滑油ライン１５を通って高圧ポンプ１０２のカム室１０２Ｃ内に送られ、この燃料が潤滑油として働くようになっている。なお、潤滑油ライン１５を介して高圧ポンプ１０２に送られる燃料は、カム室１０２Ｃ内の各部材の潤滑油として用いられるのに限定されず、他の部位の潤滑油として適宜に供給してもよいことは勿論である。   The fuel pressure regulating valve 11 further has a take-out port 11C for taking out the fuel sent from the low-pressure pump 3 as a lubricating oil. The fuel taken out from the take-out port 11C is a lubricating oil having an orifice 14. The fuel is fed into the cam chamber 102C of the high-pressure pump 102 through the line 15, and this fuel works as lubricating oil. The fuel sent to the high-pressure pump 102 via the lubricating oil line 15 is not limited to being used as lubricating oil for each member in the cam chamber 102C, and may be appropriately supplied as lubricating oil for other parts. Of course it is good.

以上説明したように、燃料供給装置１によって、所定の圧力に調圧された比較的低圧の供給燃料が調量されて高圧ポンプ１０２に送給される。そして、シリンダ室１０２Ｂ内でこの供給燃料が加圧され、これにより生じた高圧燃料は、高圧ポンプ１０２の吐出ポート １０２Ｄから逆止弁１９及び高圧配管２０を介してコモンレール１０１に送られる。   As described above, the fuel supply device 1 measures a relatively low-pressure supply fuel that has been regulated to a predetermined pressure and feeds it to the high-pressure pump 102. The supplied fuel is pressurized in the cylinder chamber 102B, and the high-pressure fuel generated thereby is sent from the discharge port 102D of the high-pressure pump 102 to the common rail 101 through the check valve 19 and the high-pressure pipe 20.

上述した構成において、低圧ポンプ３の圧送側（出口側）に許容レベルを超える高圧燃料が生じた際にこの高圧燃料を圧送側からそのインテーク側（入口側）に戻すことができるようにすると共に、手動ポンプ６により燃料の供給があった場合にはその送給燃料を低圧ポンプ３を迂回して低圧ポンプ３の圧送側に送ることができるようにするため、弁装置３０が設けられている。   In the configuration described above, when high pressure fuel exceeding the allowable level is generated on the pressure feeding side (outlet side) of the low pressure pump 3, the high pressure fuel can be returned from the pressure feeding side to the intake side (inlet side). In addition, when fuel is supplied by the manual pump 6, a valve device 30 is provided so that the supplied fuel can be sent to the pressure feeding side of the low pressure pump 3 by bypassing the low pressure pump 3. .

弁装置３０は、低圧ポンプ３の燃料入口側ポート３Ａと燃料出口側ポート３Ｂとに接続されて、低圧ポンプ３に並設されている。弁装置３０には第１ポート３０Ａ、第２ポート３０Ｂ及び、第３ポート３０Ｃが設けられており、第１ポート３０Ａは燃料出口側ポート３Ｂに接続され、第２ポート３０Ｂ及び第３ポート３０Ｃは燃料入口側ポート３Ａに接続されている。   The valve device 30 is connected to the fuel inlet side port 3 </ b> A and the fuel outlet side port 3 </ b> B of the low pressure pump 3, and is juxtaposed with the low pressure pump 3. The valve device 30 is provided with a first port 30A, a second port 30B, and a third port 30C. The first port 30A is connected to the fuel outlet side port 3B, and the second port 30B and the third port 30C are It is connected to the fuel inlet side port 3A.

弁装置３０は、燃料出口側ポート３Ｂにおける燃料圧が予め設定されている所与の許容圧力を超えた場合、低圧ポンプ３の燃料高圧側の燃料を弁装置３０の第２ポート３０Ｂから低圧ポンプ３の燃料低圧側に戻し、且つ、手動ポンプ６により低圧ポンプ３の燃料低圧側に燃料が供給された場合には、この手動送給による燃料圧力の上昇に応答してその手動送給燃料を第３ポート３０Ｃから第１ポート３０Ａに流し、これにより手動送給燃料を低圧ポンプ３を迂回して燃料供給路７に送り込むことができるように構成されている。   When the fuel pressure at the fuel outlet side port 3B exceeds a predetermined allowable pressure, the valve device 30 supplies the fuel on the high pressure side of the low pressure pump 3 from the second port 30B of the valve device 30 to the low pressure pump. 3 and when the fuel is supplied to the fuel low pressure side of the low pressure pump 3 by the manual pump 6, the manually supplied fuel is supplied in response to the increase in the fuel pressure by the manual feed. The third port 30C flows to the first port 30A, so that manually supplied fuel can be sent to the fuel supply path 7 by bypassing the low-pressure pump 3.

図２には、弁装置３０の断面図が拡大して示されている。以下、図２を参照して弁装置３０の構成について説明する。   FIG. 2 is an enlarged cross-sectional view of the valve device 30. Hereinafter, the configuration of the valve device 30 will be described with reference to FIG.

弁装置３０は、シリンダ本体３１を具えている。シリンダ本体３１は一端のみが開口されている円筒状の部材であり、その一端開口部に第１ポート３０Ａが設けられている。シリンダ本体３１の周壁部には、さらに、第２ポート３０Ｂ及び第３ポート３０Ｃが設けられている。シリンダ本体３１は、その中空内部に細径中空部３１Ａと太径中空部３１Ｂとが形成されており、第１ポート３０Ａ側に設けられた細径中空部３１Ａの周壁部に第２ポート３０Ｂが設けられ、シリンダ本体３１の閉塞端３１Ｘ側に設けられた太径中空部３１Ｂの周壁部に第３ポートが設けられている。   The valve device 30 includes a cylinder body 31. The cylinder body 31 is a cylindrical member having only one end opened, and the first port 30A is provided at the one end opening. The peripheral wall of the cylinder body 31 is further provided with a second port 30B and a third port 30C. The cylinder body 31 is formed with a small-diameter hollow portion 31A and a large-diameter hollow portion 31B in the hollow interior, and the second port 30B is provided on the peripheral wall portion of the small-diameter hollow portion 31A provided on the first port 30A side. A third port is provided on the peripheral wall portion of the large-diameter hollow portion 31 </ b> B provided on the closed end 31 </ b> X side of the cylinder body 31.

なお、図１では第２ポート３０Ｂ及び第３ポート３０Ｃはそれぞれ１つのみを示したが、実際には、図２に示されるように、それぞれ２つづつ設けられている。しかし、これらのポートの形成個数は１つ以上任意の数であってよい。   In FIG. 1, only one second port 30B and three third ports 30C are shown, but in actuality, two each are provided as shown in FIG. However, the number of these ports formed may be one or more and any number.

以上のように構成されているシリンダ本体３１内には、第１ポート３０Ａからの燃料圧を受圧すると共に第２ポート３０Ｂを開閉するピストン弁部材３２が収容されている。ピストン弁部材３２が第１ポート３０Ａの燃料圧力に応じて第２ポート３０Ｂを開閉できるようにするため、ピストン弁部材３２はばね部材３３によってばね付勢されている。   A piston valve member 32 that receives fuel pressure from the first port 30A and opens and closes the second port 30B is accommodated in the cylinder body 31 configured as described above. The piston valve member 32 is spring-biased by a spring member 33 so that the piston valve member 32 can open and close the second port 30B according to the fuel pressure of the first port 30A.

図示の実施例では、ばね部材３３はコイルばねとなっており、ピストン弁部材３２は細径中空部３１Ａに案内されて軸方向に細径中空部３１Ａの内周面と油密状態を保って滑動するように設けられている。ピストン弁部材３２の太径中空部３１Ｂ側端部にはストッパ部材３２Ａが設けられており、太径中空部３１Ｂ内に収容されているばね部材３３によってピストン弁部材３２は第１ポート３０Ａに向けてばね付勢されている。   In the illustrated embodiment, the spring member 33 is a coil spring, and the piston valve member 32 is guided by the small-diameter hollow portion 31A to maintain an oil-tight state with the inner peripheral surface of the small-diameter hollow portion 31A in the axial direction. It is provided to slide. A stopper member 32A is provided at the end of the piston valve member 32 on the large-diameter hollow portion 31B side, and the piston valve member 32 is directed toward the first port 30A by a spring member 33 accommodated in the large-diameter hollow portion 31B. Spring-biased.

なお、ピストン弁部材３２内には、後述する逆止弁機構が組み込まれており、第１ポート３０Ａに与えられた燃料圧はこの逆止弁機構を閉弁する方向に作用するので、結局、第１ポート３０Ａに与えられた燃料圧はピストン弁部材３２をばね部材３３方向に向けて押しやるように作用する構成となっている。   The piston valve member 32 incorporates a check valve mechanism, which will be described later, and the fuel pressure applied to the first port 30A acts in a direction to close the check valve mechanism. The fuel pressure applied to the first port 30A is configured to act to push the piston valve member 32 toward the spring member 33.

この結果、第１ポート３０Ａの燃料圧がばね部材３３の力より充分に小さいと、ピストン弁部材３２は、ストッパ部材３２Ａが細径中空部３１Ａと太径中空部３１Ｂとにより形成される段部３１Ｃに係止するまで第１ポート３０Ａに向けて押しやられ、図２に示されている状態となる。このとき、第２ポート３０Ｂはピストン弁部材３２によって塞がれるので、第１ポート３０Ａの燃料圧が第２ポート３０Ｂから逃げることはない。   As a result, when the fuel pressure of the first port 30A is sufficiently smaller than the force of the spring member 33, the piston valve member 32 has a step portion in which the stopper member 32A is formed by the small-diameter hollow portion 31A and the large-diameter hollow portion 31B. It is pushed toward the first port 30A until it is locked to 31C, resulting in the state shown in FIG. At this time, since the second port 30B is blocked by the piston valve member 32, the fuel pressure of the first port 30A does not escape from the second port 30B.

ここで、ばね部材３３のばね力は、第１ポート３０Ａの燃料圧が上昇して所定の許容レベルを超えたときに、ピストン弁部材３２がばね部材３３に向けて後退してピストン弁部材３２が第２ポート３０Ｂを開放するように設定されている。   Here, the spring force of the spring member 33 is such that the piston valve member 32 moves backward toward the spring member 33 when the fuel pressure at the first port 30A rises and exceeds a predetermined allowable level. Is set to open the second port 30B.

この結果、低圧ポンプ３の燃料出口側ポート３Ｂから吐出される吐出燃料圧が所与の許容レベルを超えるまでは第２ポート３０Ｂからこの吐出燃料圧が逃げることはないが、この吐出燃料圧が所与の許容レベルを超えると、ピストン弁部材３２の後退により第２ポート３０Ｂが開放されて第１ポート３０Ａと連通し、吐出燃料圧が第１ポート３０Ａから第２ポート３０Ｂを通って低圧ポンプ３の燃料低圧側に逃がされ、これにより、低圧ポンプ３の燃料出口側ポート３Ｂからの吐出燃料圧が所与の許容レベルを超えることがないようにするための燃料圧力調整動作が行われる。   As a result, the discharged fuel pressure does not escape from the second port 30B until the discharged fuel pressure discharged from the fuel outlet side port 3B of the low-pressure pump 3 exceeds a given allowable level. When a given allowable level is exceeded, the second port 30B is opened by the retraction of the piston valve member 32 to communicate with the first port 30A, and the discharged fuel pressure passes from the first port 30A through the second port 30B to the low pressure pump. 3 is released to the low-pressure side of the fuel, whereby a fuel pressure adjustment operation is performed so that the fuel pressure discharged from the fuel outlet-side port 3B of the low-pressure pump 3 does not exceed a given allowable level. .

弁装置３０においては、さらに、第３ポート３０Ｃの燃料圧力が第１ポート３０Ａの燃料圧力より大きくなった場合に第３ポート３０Ｃの燃料圧力を第１ポート３０Ａに逃すため、ピストン弁部材３２内には逆止弁機構３４が設けられている。   Further, in the valve device 30, the fuel pressure in the third port 30C is released to the first port 30A when the fuel pressure in the third port 30C becomes higher than the fuel pressure in the first port 30A. Is provided with a check valve mechanism 34.

逆止弁機構３４は、弾発ばね３４Ａと、球状弁体３４Ｂと、弁座３４Ｃとを有しており、これらの部材がピストン弁部材３２の中空部内に組み立てられて収容されて成っている。弾発ばね３４Ａは、多孔板として形成されておりピストン弁部材３２の内壁に固定されているばね受け部材３４Ｄと球状弁体３４Ｂとの間に配設されている。   The check valve mechanism 34 includes a resilient spring 34A, a spherical valve body 34B, and a valve seat 34C, and these members are assembled and accommodated in the hollow portion of the piston valve member 32. . The elastic spring 34A is formed as a perforated plate and is disposed between a spring receiving member 34D fixed to the inner wall of the piston valve member 32 and the spherical valve body 34B.

したがって、第１ポート３０Ａの燃料圧が第３ポート３０Ｃの燃料圧力よりも高い場合には、第１ポート３０Ａの燃料圧により球状弁体３４Ｂが弁座３４Ｃに着座せしめられ、逆止弁機構３４は閉状態となっている。第３ポート３０Ｃの燃料圧が上昇して第１ポート３０Ａの燃料圧を超えると、球状弁体３４Ｂが弁座３４Ｃから離され、逆止弁機構３４が開状態となり、第３ポート３０Ｃの燃料圧は第１ポート３０Ａに逃される。   Therefore, when the fuel pressure of the first port 30A is higher than the fuel pressure of the third port 30C, the spherical valve body 34B is seated on the valve seat 34C by the fuel pressure of the first port 30A, and the check valve mechanism 34 Is closed. When the fuel pressure in the third port 30C rises and exceeds the fuel pressure in the first port 30A, the spherical valve body 34B is separated from the valve seat 34C, the check valve mechanism 34 is opened, and the fuel in the third port 30C The pressure is released to the first port 30A.

手動ポンプ６は、燃料経路、配管経路内の空気抜きを行うために設けられたものである。本実施の形態にあっては、手動ポンプ６は低圧ポンプ３のインテーク側（入口側）に設けられているが、手動ポンプ６は、低圧ポンプの燃料出口側ポート３Ｂとフィルタ８との中間に構成することもある。このように構成された場合、手動ポンプ６により燃料の手動吸い込みが行われ、第３ポート３０Ｃの燃料圧力が第１ポート３０Ａの燃料圧力より高くなり、低圧ポンプを迂回して燃料を供給することが可能となる。手動ポンプ６により燃料の手動送り込みが行われ、第３ポート３０Ｃの燃料圧が第１ポート３０Ａの燃料圧より高くなると、手動ポンプ６により送り込まれた燃料は第３ポート３０Ｃから逆止弁機構３４を通って第１ポート３０Ａに送られる。すなわち、燃料タンク２内の燃料Ｆを低圧ポンプ３を迂回して燃料送給路７に送ることができる。   The manual pump 6 is provided for venting air in the fuel path and the piping path. In the present embodiment, the manual pump 6 is provided on the intake side (inlet side) of the low-pressure pump 3, but the manual pump 6 is located between the fuel outlet side port 3 </ b> B of the low-pressure pump and the filter 8. May be configured. When configured in this way, manual suction of fuel is performed by the manual pump 6, the fuel pressure of the third port 30C becomes higher than the fuel pressure of the first port 30A, and fuel is supplied bypassing the low-pressure pump. Is possible. When manual feed of fuel is performed by the manual pump 6 and the fuel pressure of the third port 30C becomes higher than the fuel pressure of the first port 30A, the fuel fed by the manual pump 6 flows from the third port 30C to the check valve mechanism 34. Through the first port 30A. That is, the fuel F in the fuel tank 2 can be sent to the fuel supply path 7 bypassing the low-pressure pump 3.

弁装置３０は以上のように構成されているので、単体の装置でありながら、低圧ポンプ３の圧送側（出口側）に許容レベルを超える高圧が生じた際にこの高圧燃料を圧送側からそのインテーク側（入口側）に戻す動作に加えて、手動ポンプ６により燃料の供給があった場合にはその送給燃料を低圧ポンプ３を迂回して低圧ポンプ３の圧送側に送ることができる。したがって、弁装置の単体化が図られるので、小型化が現実でき、コストも低減できる。   Since the valve device 30 is configured as described above, the high-pressure fuel is supplied from the pressure-feeding side to the pressure-feeding side (outlet side) of the low-pressure pump 3 when a high pressure exceeding an allowable level is generated. In addition to the operation of returning to the intake side (inlet side), when fuel is supplied by the manual pump 6, the supplied fuel can be sent to the pressure-feeding side of the low-pressure pump 3 by bypassing the low-pressure pump 3. Therefore, since the valve device is made simple, downsizing can be realized and the cost can be reduced.

本発明の一実施形態の一例を示す構成図。The block diagram which shows an example of one Embodiment of this invention. 図１に示した弁装置の拡大断面図。The expanded sectional view of the valve apparatus shown in FIG.

符号の説明Explanation of symbols

１ 燃料供給装置
２ 燃料タンク
３ 低圧ポンプ
３Ａ 燃料入口側ポート
３Ｂ 燃料出口側ポート
４、８ フィルタ
５ 燃料供給路
６ 手動ポンプ
７ 燃料送給路
９ 制御弁
１０、１９ 逆止弁
１１ 燃料調圧弁
１１Ａ 受圧ポート
１１Ｂ オーバーフローポート
１１Ｃ 取出しポート
１２ 配管
１３ ドレイン配管
１４、１６ オリフィス
１５ 潤滑油ライン
１７ バイパス油路
１８ 油路
２０ 高圧配管
３０ 弁装置
３０Ａ 第１ポート
３０Ｂ 第２ポート
３０Ｃ 第３ポート
３１ シリンダ本体
３１Ａ 細径中空部
３１Ｂ 太径中空部
３１Ｃ 段部
３１Ｘ 閉塞端
３２ ピストン弁部材
３２Ａ ストッパ部材
３３ ばね部材
３４ 逆止弁機構
３４Ａ 弾発ばね
３４Ｂ 球状弁体
３４Ｃ 弁座
３４Ｄ ばね受け部材 DESCRIPTION OF SYMBOLS 1 Fuel supply apparatus 2 Fuel tank 3 Low pressure pump 3A Fuel inlet side port 3B Fuel outlet side port 4, 8 Filter 5 Fuel supply path 6 Manual pump 7 Fuel supply path 9 Control valve 10, 19 Check valve 11 Fuel pressure regulating valve 11A Pressure receiving port 11B Overflow port 11C Extraction port 12 Piping 13 Drain piping 14, 16 Orifice 15 Lubricating oil line 17 Bypass oil passage 18 Oil passage 20 High pressure piping 30 Valve device 30A 1st port 30B 2nd port 30C 3rd port 31 Cylinder body 31A Small hollow portion 31B Large hollow portion 31C Stepped portion 31X Closed end 32 Piston valve member 32A Stopper member 33 Spring member 34 Check valve mechanism 34A Bullet spring 34B Spherical valve body 34C Valve seat 34D Spring receiving member

Claims (1)

燃料タンクからの燃料をフィードポンプによって加圧して出力するように構成された燃料供給装置において、
前記フィードポンプの燃料入口側ポートと燃料出口側ポートとに接続されている弁装置を備えており、
該弁装置が、
前記燃料出口側ポートに接続された第１ポートと前記燃料入口側ポートに接続された第２及び第３ポートとを有するシリンダ本体と、
該シリンダ本体内に前記第１ポートの燃料圧を受圧すると共に前記第２ポートを開閉できるように収容されたピストン弁部材と、
該ピストン弁部材が前記第１ポートの燃料圧力に応じて前記第２ポートを開閉できるよう該ピストン弁部材をばね付勢するためのばね部材と、
前記第３ポートの燃料圧力が前記第１ポートの燃料圧力より大きくなった場合に前記第３ポートの燃料圧力を前記第１ポートに逃すため前記ピストン弁部材内に設けられた逆止弁機構と
を備えて成っていることを特徴とする燃料供給装置。 In a fuel supply apparatus configured to pressurize and output fuel from a fuel tank by a feed pump,
A valve device connected to the fuel inlet side port and the fuel outlet side port of the feed pump;
The valve device is
A cylinder body having a first port connected to the fuel outlet side port and second and third ports connected to the fuel inlet side port;
A piston valve member accommodated in the cylinder body so as to receive the fuel pressure of the first port and open and close the second port;
A spring member for spring-biasing the piston valve member so that the piston valve member can open and close the second port according to the fuel pressure of the first port;
A check valve mechanism provided in the piston valve member for releasing the fuel pressure of the third port to the first port when the fuel pressure of the third port becomes higher than the fuel pressure of the first port; A fuel supply device comprising:
JP2008107539A 2008-04-17 2008-04-17 Fuel supplying device Pending JP2009257200A (en)

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