EP0761960A1 - Kraftstoffeinspritzpumpe - Google Patents

Kraftstoffeinspritzpumpe Download PDF

Info

Publication number
EP0761960A1
EP0761960A1 EP96306393A EP96306393A EP0761960A1 EP 0761960 A1 EP0761960 A1 EP 0761960A1 EP 96306393 A EP96306393 A EP 96306393A EP 96306393 A EP96306393 A EP 96306393A EP 0761960 A1 EP0761960 A1 EP 0761960A1
Authority
EP
European Patent Office
Prior art keywords
rotor
fuel
plug
electromagnetic valve
injection pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96306393A
Other languages
English (en)
French (fr)
Inventor
Yokota c/o Zexel Corp. Konan Factory Tooru
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Corp
Original Assignee
Zexel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zexel Corp filed Critical Zexel Corp
Publication of EP0761960A1 publication Critical patent/EP0761960A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
    • F02M41/1405—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis
    • F02M41/1411—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis characterised by means for varying fuel delivery or injection timing
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means

Definitions

  • the present invention relates to a fuel injection pump that is used for fuel supply to an engine or the like, i.e., to a fuel injection pump used, for instance, as a fuel injection pump or the like employing an inner cam system which controls the injection start timing and the injection end timing of fuel by opening and closing the communication between a fuel chamber and an inflow / outflow port of a rotor with an electromagnetic valve. More specifically, the present invention relates to a fuel injection pump in which the plug of the electromagnetic valve is provided in a direction that is different from the direction in which the rotor extends.
  • Fuel injection pumps of this type in the known art include, for instance, the one disclosed in Japanese Unexamined Patent Publication No. S60-228733 and the one disclosed in Japanese Unexamined Patent Publication No. S58-133468.
  • an electromagnetic valve is mounted at a housing with its plug provided extending in a direction running at a right angle to the direction of the axis of the rotor (rotary distributor), and the solenoid portion of the electromagnetic valve is structured to be exposed from the housing surface.
  • the plug which is pulled by the solenoid portion is provided in such a manner that it can come in contact with a valve seat 13, with a fuel intake 19 provided at a side surface of the valve seat 13 so that fuel that is made to flow in through this fuel intake 19 travels through a circular chamber 20 formed around the plug, a conical valve that opens and closes between the plug and the valve seat 13 and a lateral hole 17 and a longitudinal hole 18 formed in the plug to be conducted from the front end of the plug to a fuel inflow passage 28 of the rotor (rotary distributor 27), to be finally supplied to an operating chamber 29.
  • the latter fuel injection pump is provided with an inner cam (circular cam 10) around a rotor (rotor 3) which operates in synchronization with an engine and plungers (12) are caused to make reciprocal movement in the direction of the radius of the rotor (rotor 3) by the cam surfaces formed on the inside of the inner cam (circular cam 10) so that the volumetric capacity of an operating chamber 19 is varied.
  • a first electromagnetic valve which adjusts the injection start timing of fuel by opening and closing a spill passage 27 that can communicate with the operating chamber 19 and a second electromagnetic valve which adjusts the injection end timing of the fuel by opening and closing a spill passage 26 that likewise can communicate with the operating chamber 19 are provided.
  • a spool (escape valve 30 or 31) provided in a direction running at a right angle to the direction in which the rotor (rotor 3) extends is made to be displaced through power supply control of a solenoid 36 or 37.
  • the first electromagnetic valve normally leaves the spill passage 27 which communicates with the operating chamber 19 in an open state (normal open) and when starting injection, it closes the spill passage 27 to block the spill route of the fuel supplied to the operating chamber 19, whereas the second electromagnetic valve normally leaves the spill passage 26, which communicates with the operating chamber 19, in a closed state (normal close) and when ending injection, it opens the spill passage 26 to spill the compressed fuel.
  • the inventor of the present invention taking into consideration the fact that in a fuel injection pump in which fuel is induced into the operating chamber via a passage in a rotor, it is necessary to minimize the length of the passage leading from the electromagnetic valve to the operating chamber to reduce the dead volume and the fact that it is necessary to ensure that the operating noise of the electromagnetic valve is not readily communicated to the outside to reduce the noise of the fuel injection pump, has conducted research into various alternatives in regard to the mounting position and the mounting method of the electromagnetic valve, which has resulted in the present invention.
  • the fuel injection pump according to the present invention is provided with a rotor provided rotatably relative to an immobile member inside a pump housing, in which a passage communicating with an operating chamber, an inflow / outflow port connecting to this passage and a distribution port are formed, a communicating passage formed at the immobile member, which causes the inflow / outflow port of the rotor and a fuel chamber to communicate with each other and an electromagnetic valve which opens and closes this communicating passage.
  • the electromagnetic valve is housed inside the pump housing with the plug of the electromagnetic valve positioned in such a manner that it slides against the side of the rotor in a direction other than the direction of the axis of the rotor.
  • the proximate portions of the plug and the rotor come into communication with each other at a fuel path that constitutes a portion of the communicating passage and the electromagnetic valve is structured in such a manner that its valve seat for receiving the plug is provided near this fuel path to open and close the communicating passage.
  • This fuel injection pump may be structured so that the plug of the electromagnetic valve is positioned, for instance, in a direction running at a right angle to the direction of the axis of the rotor.
  • the smaller the dead volume (the shorter the length of the path extending from the valve seat to the operating chamber), the easier it is to pressurize the fuel to be compressed to a high level, and if the plug of the electromagnetic valve is positioned in a direction different from the direction of the axis of the rotor at the side of the rotor, as in the present invention, it is possible to form the inflow / outflow port of the rotor at a position close to the operating chamber.
  • the distance extending from the valve seat to the inflow / outflow port of the rotor can be reduced, which results in a reduced distance overall from the valve seat to the operating chamber, achieving a reduction in the actual dead volume.
  • the electromagnetic valve since the electromagnetic valve is housed within the pump housing, it does not become exposed out of the housing, making the operating noise of the electromagnetic valve leak to the outside less readily.
  • the structure described above may be optimal for a so-called VR type fuel injection pump or the like in which the operating chamber is provided at the rotor, a plurality of plunger passages extending in the direction of the radius from the operating chamber are provided at the rotor, a plunger is provided slidably in each of the plunger passages and the plungers are caused to make reciprocal movement in the direction of the radius of the rotor by an inner cam provided around the rotor, and even more preferably, the electromagnetic valve should be provided projecting out to the fuel chamber in order to forcibly cool the electromagnetic valve.
  • FIG. 1 which shows a distributor type fuel injection pump employing the inner cam system (opposed plunger system)
  • a rotor 3 is provided within pump housing members 2a, 2b and 2c in a distributor type fuel injection pump 1, and the rotor 3, which is linked to a drive shaft 4, rotates upon receiving drive torque imparted by an engine (not shown) in synchronization with the engine.
  • a feed pump 5 is secured at the drive shaft 4, and fuel in a fuel tank (not shown) is supplied via the feed pump 5 to a fuel chamber 6 in a slightly pressurized state.
  • the rotor 3 is inserted rotatably in a barrel 7 which is secured at the pump housing members 2a and 2b and is provided with a larger diameter portion 3a, which is formed by increasing the diameter toward the base portion with plunger passages 8 formed in the larger diameter portion, extending in the direction of the radius (radial direction).
  • a plunger 9 is inserted slidably.
  • each plunger 9 faces opposite an operating chamber 10 provided at the center of the rotor 3, blocking the operating chamber 10, with the base end of the plunger 9 sliding in contact with the inner surface of a ring-like inner cam 13 via a shoe 11 and a roller 12.
  • This inner cam 13 is provided concentrically to the rotor 3 around its larger diameter portion, and it is provided with cam surfaces on its inside, the number of which corresponds to the number of cylinders in the engine.
  • the inner cam 13 is formed to correspond to a four cylinder engine, it is provided with projected surfaces on its inside over 90° intervals and, consequently, four plungers 9 move simultaneously toward the operating chamber 10 to compress the operating chamber 10, and move simultaneously away from the operating chamber 10.
  • a decentered groove 18 is formed in the portion facing opposite the inflow / outflow port 16 along the direction of the circumference of the rotor 3, and a guide hole 19 for positioning a plug 27, which is to be detailed later, in a direction running at a right angle to the direction of the axis of the rotor 3 and a connecting hole 20, which communicates between the guide hole 19 and the decentered groove 18 with the minimum distance are also formed.
  • the guide hole 19 is connected to a receptacle hole 23 where an armature 21 is housed and a solenoid portion 22 is mounted, and in the receptacle hole 23, a storage portion 24 for housing the armature 21 is connected with a passage 25 which communicates with the fuel chamber 6.
  • An electromagnetic valve 26 is provided with the plug 27 provided slidably at the guide hole 19, the armature 21 which is positioned at the receptacle hole 23 and is mounted at an end of the plug 27, the solenoid portion 22, which is fitted in the receptacle hole 23 to face opposite the armature 21 with almost half its surface including its connector exposed into the chamber, and a return spring 28 provided at the guide hole 19 to apply a constant force to the plug 27 in the direction in which the armature 21 is distanced from the solenoid portion 22.
  • the front end of the plug 27 is made to come in contact with a stopper 29 that blocks off the guide hole 19.
  • a large clearance is provided between the guide hole 19 and the plug 27 ranging from the connecting hole 20 through the receptacle hole 23 and, significantly, in the vicinity of the connecting hole 20, a valve seat 31, which comes in contact with a valve portion 30 formed on the circumferential surface of the plug 27, is formed. Consequently, when power is supplied to the solenoid portion 22 and the plug 27 moves against the spring force imparted by the spring 28, the valve portion 30 becomes seated on the valve seat 31 to close off the communicating passage (guide hole 19), and when power supply to the solenoid portion 22 is stopped, the plug 27 is reset by the return spring 28 and the valve portion 30 departs from the valve seat 31 to open the communicating passage (guide hole 19).
  • reference number 32 indicates a drive unit that performs ON/OFF control of the electromagnetic valve, which is mounted at the upper portion of the housing as an integrated part, and the connection with the solenoid portion is made within the pump.
  • reference number 33 indicates a timer that causes the inner cam to rotate and to become displaced. It changes the range over which the cam is engaged and makes it possible to control the fuel feed rate in addition to control of the injection start timing and the injection end timing performed by the electromagnetic valve 26.
  • the valve seat 31 can be provided with its distance from the inflow / outflow port 16 minimized.
  • the plug 27 is provided at a right angle to the rotor 3 at its side, it is possible to place the inflow / outflow port 16 close to the operating chamber 10.
  • the electromagnetic valve 26 is provided inside the housing, the operating noise of the electromagnetic valve 26 is not readily communicated to the outside, and since the drive unit 32 is provided at the upper portion of the electromagnetic valve to make the connection between the drive unit 32 and the solenoid portion 22 inside the pump, it is not necessary to expose the connection to the outside, eliminating the necessity for sealing the connecting portion and also eliminating the necessity for a wiring harness. Moreover, since the solenoid portion 22 of the electromagnetic valve 26 is exposed into the fuel chamber 6, fuel inside the pump is charged around the solenoid portion 22 to forcibly cool the solenoid portion 22.
  • the plug of the electromagnetic valve is provided at a side of the rotor in a direction different from the direction of the axis of the rotor, the proximate portions of the plug and the rotor are made to communicate with each other in the fuel path which constitutes a portion of the communicating passage extending from the fuel chamber to the inflow / outflow port of the rotor and the valve seat where the plug is seated is formed near the fuel path, the inflow / outflow port can be provided near the operating chamber and it is also possible to reduce the distance between the valve seat and the inflow / outflow port.
  • the present invention which makes it possible to reduce the dead volume by reducing the distance extending from the valve seat to the operating chamber and which can also achieve the start / end control of injection with short strokes of the plug, is ideally suited for an injection pump that must satisfy the requirement for high speed operation.
  • the electromagnetic valve is provided inside the housing, less operating noise is communicated to the outside so that the noise of the injection pump itself can be reduced.
  • the drive unit for the electromagnetic pump is to be mounted at the top of the pump, the drive unit and the electromagnetic valve can be connected inside the pump, eliminating the necessity for sealing the connecting portion and the need for a wiring harness.
  • the electromagnetic valve is to be provided exposed into the fuel chamber, it is possible to cool the electromagnetic valve itself with the fuel inside the pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP96306393A 1995-09-11 1996-09-04 Kraftstoffeinspritzpumpe Withdrawn EP0761960A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7258164A JPH0979102A (ja) 1995-09-11 1995-09-11 燃料噴射ポンプ
JP258164/95 1995-09-11

Publications (1)

Publication Number Publication Date
EP0761960A1 true EP0761960A1 (de) 1997-03-12

Family

ID=17316427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96306393A Withdrawn EP0761960A1 (de) 1995-09-11 1996-09-04 Kraftstoffeinspritzpumpe

Country Status (3)

Country Link
EP (1) EP0761960A1 (de)
JP (1) JPH0979102A (de)
KR (1) KR100222654B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5382870B2 (ja) * 2009-12-18 2014-01-08 ボッシュ株式会社 蓄圧式燃料噴射装置の制御装置及び制御方法並びに蓄圧式燃料噴射装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1305930A (de) * 1969-04-09 1973-02-07
JPS58133468A (ja) * 1982-02-03 1983-08-09 Hitachi Ltd 液体燃料噴射ポンプ
JPS60228733A (ja) * 1984-04-25 1985-11-14 Hitachi Ltd 速動式電磁計量弁
US4604979A (en) * 1984-04-05 1986-08-12 Diesel Kiki Co., Ltd. Electronically controlled distributor type fuel injection pump for internal combustion engines
EP0429205A2 (de) * 1989-11-20 1991-05-29 General Motors Corporation Einspritzpumpe der Kraftstoffverteilerbauaurt mit elektronischer Steuerung
US5443049A (en) * 1992-02-19 1995-08-22 Lucas Industries Public Limited Company Fuel pumping apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1305930A (de) * 1969-04-09 1973-02-07
JPS58133468A (ja) * 1982-02-03 1983-08-09 Hitachi Ltd 液体燃料噴射ポンプ
US4604979A (en) * 1984-04-05 1986-08-12 Diesel Kiki Co., Ltd. Electronically controlled distributor type fuel injection pump for internal combustion engines
JPS60228733A (ja) * 1984-04-25 1985-11-14 Hitachi Ltd 速動式電磁計量弁
EP0429205A2 (de) * 1989-11-20 1991-05-29 General Motors Corporation Einspritzpumpe der Kraftstoffverteilerbauaurt mit elektronischer Steuerung
US5443049A (en) * 1992-02-19 1995-08-22 Lucas Industries Public Limited Company Fuel pumping apparatus

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 246 (M - 253) 2 November 1983 (1983-11-02) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 092 (M - 468) 9 April 1986 (1986-04-09) *

Also Published As

Publication number Publication date
KR970016095A (ko) 1997-04-28
JPH0979102A (ja) 1997-03-25
KR100222654B1 (ko) 1999-10-01

Similar Documents

Publication Publication Date Title
JP3802097B2 (ja) タンクから内燃機関に燃料を供給するポンプ装置
US5441028A (en) Fuel injection device for internal combustion engines
US4445822A (en) Injection pump
JP3992807B2 (ja) タンクから内燃機関への燃料ポンプ装置
JPS6153454A (ja) 燃料ポンプ装置
CA1178486A (en) Distributor pump with floating piston single control valve
GB2275307A (en) I.c.engine high pressure distributor fuel injection system
US5027776A (en) Fuel pumping apparatus
EP0761960A1 (de) Kraftstoffeinspritzpumpe
CA1263282A (en) Fuel pumping apparatus
US4665875A (en) Liquid fuel pumping apparatus
JPH08226359A (ja) 燃料ポンピング装置
JP3812695B2 (ja) 燃料噴射ポンプ
US4831991A (en) Fuel injection pump
JPS6134347A (ja) 燃料ポンプ装置
JPH10184483A (ja) ポンプ装置
CA1182356A (en) Electromagnetically controlled fuel injection pump
US6004106A (en) Distributor type fuel injection pump and power transmission device
JPS60132062A (ja) 液体燃料噴射ポンプ装置
JPS62288363A (ja) 液体燃料給送装置
JPH0114417B2 (de)
JP3953539B2 (ja) ディーゼルエンジン用燃料噴射ポンプの電磁式燃料スピル弁
JP3856169B2 (ja) 分配型燃料噴射ポンプ
JPS62248866A (ja) 燃料噴射ポンプ
JP2713432B2 (ja) ディーゼルエンジンの燃料噴射ポンプ

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19970114

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB

17Q First examination report despatched

Effective date: 19980717

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19990508