EP0864037B1 - Pompe d'injection de carburant comportant un piston regulateur d'injection destine a regler le debut de l'injection - Google Patents

Pompe d'injection de carburant comportant un piston regulateur d'injection destine a regler le debut de l'injection Download PDF

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Publication number
EP0864037B1
EP0864037B1 EP97930329A EP97930329A EP0864037B1 EP 0864037 B1 EP0864037 B1 EP 0864037B1 EP 97930329 A EP97930329 A EP 97930329A EP 97930329 A EP97930329 A EP 97930329A EP 0864037 B1 EP0864037 B1 EP 0864037B1
Authority
EP
European Patent Office
Prior art keywords
pressure
control
piston
cylinder bore
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.)
Expired - Lifetime
Application number
EP97930329A
Other languages
German (de)
English (en)
Other versions
EP0864037A1 (fr
Inventor
Wolfgang Fehlmann
Thomas Kulder
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 EP0864037A1 publication Critical patent/EP0864037A1/fr
Application granted granted Critical
Publication of EP0864037B1 publication Critical patent/EP0864037B1/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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/16—Adjustment of injection timing
    • F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
    • 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/16—Adjustment of injection timing
    • F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
    • F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
    • 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
    • F02M41/10—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 pump pistons acting as the distributor
    • F02M41/12—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 pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/123—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 pump pistons acting as the distributor the pistons rotating to act as the distributor characterised by means for varying fuel delivery or injection timing
    • F02M41/128—Varying injection timing by angular adjustment of the face-cam or the rollers support
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/16—Adjustment of injection timing
    • F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
    • F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
    • F02D2001/186—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic using a pressure-actuated piston for adjustment of a stationary cam or roller support

Definitions

  • the invention is based on a fuel injection pump the genus of claim 1.
  • a fuel injection pump known from DE-A1-35 32 719 is a connecting line between the work area and Cylinder bore one of the facing the work area Front side of the spray adjustment piston outgoing axially parallel Blind hole provided at its end by a transverse bore running radially from the outside to the cylinder bore is cut.
  • the cross section of this cross hole at the entrance to the cylinder bore has a circular area.
  • control spool is adjusted to known manner by an actuator that in a part of the injection adjuster fixed to the housing has a pressure chamber includes with a surface acted upon by the control pressure.
  • an actuator that in a part of the injection adjuster fixed to the housing has a pressure chamber includes with a surface acted upon by the control pressure.
  • FIG. 1 shows a section through a fuel injection pump the distributor type with radial Pump piston and a device for spray start adjustment in the configuration according to the invention.
  • the fuel injection pumps of the distributor type can either as pumps with one as both distributor and Pump piston serving axially driven pump piston be, or radial pistons can be provided, the radially into a delivery channel arranged in a distributor promote.
  • a so-called radial piston pump of the known Design is shown in section in Figure 1.
  • Pump piston 1 is provided, the same angular distance in a common radial plane to Axis of distributor 2 in radial bores 3 of distributor 2 are tightly slidably mounted.
  • the pump piston 1 On one end enclose a common pump work room 4, the in a known, not shown here manner in the radial outward stroke the pump piston 1 is filled with fuel and with the radial inward stroke of the pump piston via one here also not recognizable pressure line with a distributor opening is connected to the outer surface of the distributor 2, the distributor opening at the circumference of the distributor controls outgoing injection lines, each of which one with inward moving pump pistons with injection pressure brought fuel is supplied.
  • the distributor is thereby by means not shown from one Drive shaft rotatably driven in such a way that on the one hand the distributor opening can perform its control function and on the other hand, the pump piston moves in the circumferential direction become.
  • cam ring 8 represents the essentially stationary Part of the cam drive of the pump pistons. While the device moving the pump piston, the z. B. the roller plunger 6 leading ring 9 can be the is coupled to the drive shaft, the moving part of the Represent cam drive.
  • the one with its cylindrical outer wall in a corresponding cylindrical recess 10 of the pump housing 11 of the Fuel injection pump is a previous or later emergence of the rollers 12 of the roller tappet 6 on the causes respective cams 13 which are arranged so that all roller tappets synchronously inwards or outwards around the same strokes.
  • the cam ring 8 has a nose 14 which in a recess 15 in an injection piston 16 whose cylindrical surface engages.
  • the injection adjustment piston is tightly displaceable in a cylinder 17 and closes with its one end 18 with the closed End of the cylinder 17 a work space 20 and with its opposite, other end face in there as well closed cylinder a spring chamber 22.
  • a return spring 23 is arranged on the one hand on a closing part closing the cylinder 17 24 and on the other hand on the end face 21 of the adjusting piston 16 supports and strives so clamped, the Injection adjusting piston 16 with its one end face 18 in System to the cylinder 17 closing opposite Bring wall 25.
  • the injection adjusting piston 16 there is also an axial blind bore 27 as a control valve 28 leading Cylinder bore provided, which extends to the spring chamber 22 opens.
  • the control slide 28 used there closes its one end face 29 with the closed end of the Cylinder bore a space 30 in which a compression spring 36th axially loaded the spool and protrudes with his other end in the spring chamber 22, where it is from a control spring 31 is applied, which on the other hand also is supported on the closure part 24.
  • Parallel to the cylinder bore 27 runs in the actuating piston from one end face 18 outgoing connecting line 32, the radial in the area of Coverage by the control spool in the cylinder bore opens.
  • This junction can by a collar 33 of the Control spool are closed, this ring collar an annular groove 34 on the work space side of one Separates the annular space 35, with a pressure medium inlet in the annular groove 34 opens and the annular space 35 in the spring space 22nd flows, which relieves a relief line, not shown is.
  • the ring edges delimiting the ring collar are Control edges through which a relative displacement of the Control spool the connecting line 32 either over the Annular groove 34 connected to the pressure medium inlet 39 or via the annular space 35 to the spring space 22 is relieved.
  • the control spool is adjusted using a Tappet 49 with which the control slide under the influence of Compression spring 36 is coupled so that it is in the spring chamber 22nd protruding end of the spool on the plunger 49 to the system comes.
  • This extends coaxially to the axis of the adjusting piston 16 or the control slide 28 and occurs on the End face 21 of the control slide opposite side in an axial bore 52 provided in the closure part 24.
  • a closed working cylinder 53 arranged coaxially to the axial Hole 52 connects and the other end through a cover 54 is closed.
  • the inlet 60 is the Connecting line 39 in the cylinder bore 27 with a elongated, preferably elliptical cross section with lying in the direction of the spool Main extension provided so that when the Control spool relative to the injection piston through the The control edge of the ring collar is initially only a small, throttling one Cross section open to the working space 20 becomes. So can vibrate the work area 20 only slightly supplied or from this pressure medium be dissipated. The tendency to vibrate when occurring Interference forces, such as engine impacts, are therefore essential reduced. Instead of an elliptical cross section, too other cross-sectional profiles that support this effect the opening of the inlet cross-section of the pressure medium inlet be realized. Compound are to be mentioned Parabolic branches or hyperbaric branches or other limitations the cross-sectional area as conic curves.
  • This configuration is particularly advantageous in connection with the one described above outside the injection adjustment piston arranged housing-fixed pressure chamber 56.
  • This Arrangement is also the occurrence of vibrations due to shocks transmitted by the cam drive avoided because this pressure chamber over the unloaded spring chamber from the shock-loaded pressure side and the resulting Movements of the injection adjustment piston is decoupled.

Landscapes

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

Claims (5)

  1. Pompe d'injection de carburant comprenant
    un piston de réglage d'injection (16) servant à régler le début de l'injection, ce piston délimitant une chambre de travail (20) dans un cylindre (17), recevant un fluide sous pression, commandé, qui déplace le piston de réglage d'injection contre une force de rappel, et
    un tiroir de commande (28) coulissant dans un alésage (27) fermé d'un côté dans le piston de réglage d'injection (16), coulissant dans la direction axiale de ce piston (16), le tiroir étant réglable par une pression de commande contre la force développée par un ressort de commande (31) et dans l'alésage (27), il commande, avec ses arrêtes de commande, la communication d'une conduite (32) entre l'alésage (27) et la chambre de travail (20) avec l'alimentation en liquide sous pression (39) dans l'alésage (27) ou coupure de la sortie du liquide sous pression (35) de l'alésage,
    caractérisée en ce que
    la section d'entrée (60) de la conduite de liaison (32) commandée par l'arrête de commande du tiroir de commande (28) dans l'alésage (27) est une section allongée, s'étendant dans la direction de coulissement du tiroir de commande.
  2. Pompe d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    la section est de forme elliptique.
  3. Pompe d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    la section est de forme parabolique.
  4. Pompe d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    la section de forme hyperbolique.
  5. Pompe d'injection de carburant selon l'une quelconque des revendications précédentes,
    caractérisée en ce qu'
    un organe d'actionnement (49, 50) qui déplace le tiroir de commande (28) présente une surface soumise à la pression de commande et cet organe d'actionnement (49, 55) pénètre avec cette surface dans une chambre de pression (57) dans une partie (24) du boítier fixe, cette chambre étant séparée de la chambre de travail (20) et
    entre la chambre de pression (56) et la chambre de travail (20) du piston de réglage d'injection (16), il y a une chambre de décharge (22) délimitée par la face frontale (21) du piston de réglage d'injection (16) et la chambre de travail (20) est prévue sur le côté du piston de réglage d'injection (16) à l'opposé de la chambre de décharge (22).
EP97930329A 1996-10-02 1997-06-17 Pompe d'injection de carburant comportant un piston regulateur d'injection destine a regler le debut de l'injection Expired - Lifetime EP0864037B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19640678 1996-10-02
DE19640678A DE19640678A1 (de) 1996-10-02 1996-10-02 Kraftstoffeinspritzpumpe mit einem der Spritzbeginnverstellung dienenden Spritzverstellkolben
PCT/DE1997/001225 WO1998014695A1 (fr) 1996-10-02 1997-06-17 Pompe d'injection de carburant comportant un piston regulateur d'injection destine a regler le debut de l'injection

Publications (2)

Publication Number Publication Date
EP0864037A1 EP0864037A1 (fr) 1998-09-16
EP0864037B1 true EP0864037B1 (fr) 2002-03-20

Family

ID=7807696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97930329A Expired - Lifetime EP0864037B1 (fr) 1996-10-02 1997-06-17 Pompe d'injection de carburant comportant un piston regulateur d'injection destine a regler le debut de l'injection

Country Status (8)

Country Link
US (1) US6041760A (fr)
EP (1) EP0864037B1 (fr)
JP (1) JP2000501478A (fr)
KR (1) KR100453752B1 (fr)
CN (1) CN1079897C (fr)
DE (2) DE19640678A1 (fr)
HU (1) HU222147B1 (fr)
WO (1) WO1998014695A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102305140A (zh) * 2011-08-30 2012-01-04 潍柴动力股份有限公司 喷油器开启时间测量设备和喷油器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19849925A1 (de) * 1998-10-29 2000-05-04 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
GB9914150D0 (en) * 1999-06-18 1999-08-18 Rotech Holdings Limited Improved pump
GB0303603D0 (en) * 2003-02-17 2003-03-19 Delphi Tech Inc Improvements in or relating to pressurisation pumps
US7048516B2 (en) * 2003-06-09 2006-05-23 Delphi Technologies, Inc. High pressure fuel pump with multiple radial plungers

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3532719A1 (de) * 1985-09-13 1987-03-26 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
JPH0814067A (ja) * 1994-06-24 1996-01-16 Zexel Corp 燃料噴射ポンプのサーボバルブ式タイマ
DE4440749A1 (de) * 1994-11-15 1996-05-23 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
JPH08261019A (ja) * 1995-01-24 1996-10-08 Nippon Soken Inc 燃料噴射ポンプの噴射時期制御装置
DE19533807A1 (de) * 1995-09-13 1997-03-20 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
JPH10274059A (ja) * 1997-03-28 1998-10-13 Zexel Corp 分配型燃料噴射装置のタイマ装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102305140A (zh) * 2011-08-30 2012-01-04 潍柴动力股份有限公司 喷油器开启时间测量设备和喷油器
CN102305140B (zh) * 2011-08-30 2014-06-11 潍柴动力股份有限公司 喷油器开启时间测量设备和喷油器

Also Published As

Publication number Publication date
KR19990071634A (ko) 1999-09-27
DE19640678A1 (de) 1998-04-09
KR100453752B1 (ko) 2004-12-23
WO1998014695A1 (fr) 1998-04-09
US6041760A (en) 2000-03-28
EP0864037A1 (fr) 1998-09-16
CN1205048A (zh) 1999-01-13
HUP9901493A2 (hu) 1999-08-30
CN1079897C (zh) 2002-02-27
JP2000501478A (ja) 2000-02-08
HU222147B1 (hu) 2003-04-28
HUP9901493A3 (en) 2000-03-28
DE59706678D1 (de) 2002-04-25

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