EP0263304A2 - Pompe d'injection de carburant pour moteurs à combustion interne - Google Patents

Pompe d'injection de carburant pour moteurs à combustion interne Download PDF

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Publication number
EP0263304A2
EP0263304A2 EP19870112919 EP87112919A EP0263304A2 EP 0263304 A2 EP0263304 A2 EP 0263304A2 EP 19870112919 EP19870112919 EP 19870112919 EP 87112919 A EP87112919 A EP 87112919A EP 0263304 A2 EP0263304 A2 EP 0263304A2
Authority
EP
European Patent Office
Prior art keywords
pump
recess
control slide
control
fuel injection
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.)
Granted
Application number
EP19870112919
Other languages
German (de)
English (en)
Other versions
EP0263304B1 (fr
EP0263304A3 (en
Inventor
Josef Güntert
Johann Ing. Grad. Warga
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0263304A2 publication Critical patent/EP0263304A2/fr
Publication of EP0263304A3 publication Critical patent/EP0263304A3/de
Application granted granted Critical
Publication of EP0263304B1 publication Critical patent/EP0263304B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/001—Pumps with means for preventing erosion on fuel discharge
    • 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

Definitions

  • the invention relates to a fuel injection pump for internal combustion engines according to the preamble of the main claim.
  • the injection quantity and / or the start of injection is determined by the axial position of the control slide.
  • the control slide can also be rotated in order to influence the fuel control in this way.
  • the end of the high-pressure injection - on the one hand, seen at the time as the injection end, on the other hand, as the end of the high-pressure delivery determining the injection quantity - is determined in that the control opening on the pump piston is exposed by the control slide, so that the fuel, which is under very high pressure, comes out the pump work space is controlled via the relief channel and the control opening in the recess of the cylinder liner.
  • the deflected fuel jet has an extraordinarily high kinetic energy which leads to a high load on the materials which the jet hits.
  • the pressures in the pump workspace of the pump can reach up to 1,300 bar.
  • the energy losses between the pump workspace and the shutdown point are relatively low, since the injection is interrupted abruptly from the shutdown to ensure that the nozzle needle closes quickly.
  • This type of beam deflection has the disadvantage that the deflected beam, which is still under very high kinetic energy, hits the wall of the suction space, which Like the entire pump housing, is made of softer material, for example aluminum, than the pump cylinder liner and the spool valve, which are made of hardened steel. The result is cavitation and erosion damage to the suction chamber wall of the pump housing and to the control parts in the suction chamber.
  • the fuel injection pump according to the invention with the characterizing features of the main claim has the advantage that the exhaust beam is reflected several times, namely from the wall of the recess on the apron and back again, so that the jet energy is almost destroyed before the fuel is then above or flows to the suction chamber below the apron.
  • An advantage here is that the apron is axially displaced with the control slide and so there is always a sufficient cross section between the gap formed by the control slide and recess and the Suction chamber exists.
  • the input of at least one radial bore arranged in the control slide serves as the control edge in a manner known per se, in order to obtain targeted beam guidance.
  • the invention are also such controls in which the control edge is arranged on any corresponding radial opening of the control slide or is provided on the upper end face of the control slide, the radial bore then being arranged in the pump piston.
  • control slide is guided against rotation in the cylinder liner, so that the direction of radiation and thus also the direction of the reflected beam is always the same and can be predetermined.
  • the access of the recess with respect to the cylinder axis is provided only radially on one side, so that the apron is correspondingly only present on the side of the control slide which faces the suction chamber.
  • the rear wall of the recess, which is formed by the cylinder liner, is thus made of hardened steel so that the deflecting beam striking it cannot cause any damage.
  • the apron can have surfaces running at right angles to the gap, which are present on the spool-widening heels. These paragraphs can either dive straight into the access of the recess or remain outside the recess, it only having to be achieved through the surfaces that the fuel jet can be reflected for energy destruction.
  • FIG. 1 shows a partial longitudinal section through a fuel injection pump according to the invention and
  • FIG. 2 shows a cross section along line II-II in FIG. 1.
  • a cylinder liner 2 is inserted, in which a pump piston 3 is driven by means (not shown) for its reciprocating movement.
  • a recess 4 formed in the manner of a bag opening, which receives a control slide 5 which can be axially displaced on the pump piston 3.
  • the recess 4 has an access 6, through which the control slide can be used.
  • a longitudinal slot 8 In the rear wall 7 of the recess there is a longitudinal slot 8 into which a lug 9 of the control slide 5 engages, as a result of which the control slide 5 can perform an axial movement and is secured against rotation.
  • control slide 5 takes place via a rotatable control rod 11, on which a driving element 12 with a head 13 can be clamped by a screw 14 and is thus adjustable in the rotational position, the head 13 engaging in a transverse groove 15 of the control slide 5.
  • a fuel injection pump several such pump elements 2, 3 with control slides 5 are arranged in series in the housing 1, which are then operated together by a control rod 11, the driving elements 12 of which correspond to the number of pump elements.
  • the control rod 11 and the entrainment members 12 are arranged in a pump suction chamber 16 which, as is not shown in more detail, is supplied with fuel under low pressure from a fuel tank via a feed pump.
  • the access 6 of the recess 4 of the pump cylinder 2 faces this suction chamber 16, so that there is an open V connection between the recess 4 and the suction chamber 16.
  • the pump piston 3 assumes its bottom dead center position (UT), opening up suction openings 17 of the pump working chamber 18, which are connected to the pump suction chamber 16 via a channel 19 present in the pump cylinder liner 2 or a twist 21 on the cylinder liner 2 .
  • oblique groove 22 and recess 23 which are arranged as control openings in pairs on the pump piston 3 and are connected to one another via a transverse bore 24, which leads via a blind bore 25 to the pump work chamber 18.
  • These control openings namely the oblique grooves 22 and recesses 23 cooperate with two radial bores 26 of the control slide 5 serving as radial openings, the input edges 27 of these radial bores 26 serving as control edges towards the control openings, while the orifices 28 of these radial bores 26 on parallel side walls 29 of the control valve Recess 4 are directed.
  • the space gaps 31 formed between the side walls 29 and the control slide 5 are covered toward the suction space 16 by aprons 32 arranged on the control slide 5, which have surfaces 33 running perpendicular to the gap expansion.
  • the exemplary embodiment shown works as follows: In the illustrated UT position of the pump piston 3, the pump working chamber 18 is filled with fuel via the suction openings 17 and the channel 19 or the twist off 21 from the pump suction chamber 16. Depending on the axial position of the control slide 5, part of the fuel supply can also take place via the recesses 23 or oblique grooves 22, the transverse bore 24 and the blind bore 25. During the delivery stroke of the pump piston 3, part of the fuel is first displaced from the pump working chamber 18 back into the suction chamber 16 via the supply channels, at least until the suction openings 17 are closed by the pump piston 3 and at the latest until the recesses 23 or Oblique grooves 22 are compressed by the spool 5.
  • the high pressure can develop in the pump work chamber 18 and the injection to the internal combustion engine can begin.
  • This injection is ended when the control openings, namely the oblique grooves 22, overlap with the radial bores 26 of the control slide 5.
  • the fuel which is under very high pressure, is now extracted from the pump working chamber 18 via the blind bore 25, the transverse bore 24, the oblique grooves 22 and the radial bore 26 are conveyed into the space gap 31, the control fuel jet that forms in the process the opposite side walls 29 meet, on these side walls 29 the beam is reflected and partially hits the rear wall 7, for the most part on the surfaces 33 of the apron 32, in order to then flow into the remaining spaces of the recess 4 above and below the control slide 5 . From there, the fuel then reaches the suction chamber 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP87112919A 1986-10-04 1987-09-04 Pompe d'injection de carburant pour moteurs à combustion interne Expired - Lifetime EP0263304B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863633899 DE3633899A1 (de) 1986-10-04 1986-10-04 Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3633899 1986-10-04

Publications (3)

Publication Number Publication Date
EP0263304A2 true EP0263304A2 (fr) 1988-04-13
EP0263304A3 EP0263304A3 (en) 1989-04-19
EP0263304B1 EP0263304B1 (fr) 1992-04-29

Family

ID=6311091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87112919A Expired - Lifetime EP0263304B1 (fr) 1986-10-04 1987-09-04 Pompe d'injection de carburant pour moteurs à combustion interne

Country Status (4)

Country Link
US (1) US4811716A (fr)
EP (1) EP0263304B1 (fr)
JP (1) JPS6390664A (fr)
DE (2) DE3633899A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990008892A1 (fr) * 1989-01-30 1990-08-09 Voest-Alpine Automotive Gesellschaft M.B.H. Pompe d'injection pour moteurs diesel
GB2251038A (en) * 1990-12-22 1992-06-24 Bosch Gmbh Robert Fuel injection pumps for internal combustion engines
FR2681910A1 (fr) * 1991-09-30 1993-04-02 Bosch Gmbh Robert Pompe d'injection de carburant pour moteur a combustion interne dont les orifices de sortie du percage de commandes sont decales chaque fois d'un cote d'un plan de reference partout par l'axe du piston de pompe.

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3844430A1 (de) * 1988-12-31 1990-07-05 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
US5364243A (en) * 1989-08-02 1994-11-15 Diesel Kiki Co., Ltd. Fuel injection pump
DE4016435C2 (de) * 1990-05-22 1997-05-28 Daimler Benz Ag Einen Steuerschieber aufweisende schrägkantengesteuerte Kraftstoffeinspritzpumpe für Brennkraftmaschinen, insbesondere als Direkteinspritzer für Nutzfahrzeuge
DE4041656A1 (de) * 1990-12-22 1992-07-02 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE4132502C2 (de) * 1991-09-30 2001-09-27 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
DE4211886A1 (de) * 1992-04-09 1993-10-14 Bosch Gmbh Robert Kraftstoffeinspritzpumpe für Brennkraftmaschinen
DE19919430C1 (de) * 1999-04-29 2000-10-19 Bosch Gmbh Robert Einspritzpumpe
WO2002055881A1 (fr) * 2001-01-05 2002-07-18 Hitachi, Ltd. Pompe a liquide et pompe d'alimentation en carburant haute pression

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1446048A (fr) * 1964-05-25 1966-07-15 Bryce Berger Ltd Pompe perfectionnée pour l'injection de combustible liquide
DE1947763A1 (de) * 1968-09-24 1970-04-02 Cav Ltd Einspritzpumpe fuer Kraftstoff
DE3017730A1 (de) * 1980-05-09 1981-11-12 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3136751A1 (de) * 1981-09-16 1983-03-31 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3428174A1 (de) * 1984-07-31 1986-02-13 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
EP0181402A1 (fr) * 1984-05-08 1986-05-21 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Pompe d'injection de carburant
DE3540052A1 (de) * 1984-11-16 1986-05-28 Diesel Kiki Co. Ltd., Tokio/Tokyo Treibstoffeinspritzpumpe fuer verbrennungsmotoren

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3428176C2 (de) * 1984-07-31 1994-08-25 Bosch Gmbh Robert Kraftstoffeinspritzpumpe für Brennkraftmaschinen
DE3435987A1 (de) * 1984-10-01 1986-04-10 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3447375A1 (de) * 1984-12-24 1986-07-03 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
JPH0541262Y2 (fr) * 1985-04-17 1993-10-19
US4737086A (en) * 1986-05-27 1988-04-12 Diesel Kiki Co., Ltd. Fuel injection pump having variable prestroke mechanism

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1446048A (fr) * 1964-05-25 1966-07-15 Bryce Berger Ltd Pompe perfectionnée pour l'injection de combustible liquide
DE1947763A1 (de) * 1968-09-24 1970-04-02 Cav Ltd Einspritzpumpe fuer Kraftstoff
DE3017730A1 (de) * 1980-05-09 1981-11-12 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3136751A1 (de) * 1981-09-16 1983-03-31 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
EP0181402A1 (fr) * 1984-05-08 1986-05-21 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Pompe d'injection de carburant
DE3428174A1 (de) * 1984-07-31 1986-02-13 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3540052A1 (de) * 1984-11-16 1986-05-28 Diesel Kiki Co. Ltd., Tokio/Tokyo Treibstoffeinspritzpumpe fuer verbrennungsmotoren

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990008892A1 (fr) * 1989-01-30 1990-08-09 Voest-Alpine Automotive Gesellschaft M.B.H. Pompe d'injection pour moteurs diesel
US5160088A (en) * 1989-01-30 1992-11-03 Voest-Alpine Automotive Gesellschaft M.B.H. Injection pump for diesel engines
GB2251038A (en) * 1990-12-22 1992-06-24 Bosch Gmbh Robert Fuel injection pumps for internal combustion engines
GB2251038B (en) * 1990-12-22 1994-08-03 Bosch Gmbh Robert Fuel injection pumps for internal combustion engines
FR2681910A1 (fr) * 1991-09-30 1993-04-02 Bosch Gmbh Robert Pompe d'injection de carburant pour moteur a combustion interne dont les orifices de sortie du percage de commandes sont decales chaque fois d'un cote d'un plan de reference partout par l'axe du piston de pompe.

Also Published As

Publication number Publication date
JPS6390664A (ja) 1988-04-21
EP0263304B1 (fr) 1992-04-29
EP0263304A3 (en) 1989-04-19
US4811716A (en) 1989-03-14
DE3778629D1 (de) 1992-06-04
DE3633899A1 (de) 1988-04-07

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