EP0709568B1 - Pompe d'injection de combustible - Google Patents

Pompe d'injection de combustible Download PDF

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Publication number
EP0709568B1
EP0709568B1 EP95115126A EP95115126A EP0709568B1 EP 0709568 B1 EP0709568 B1 EP 0709568B1 EP 95115126 A EP95115126 A EP 95115126A EP 95115126 A EP95115126 A EP 95115126A EP 0709568 B1 EP0709568 B1 EP 0709568B1
Authority
EP
European Patent Office
Prior art keywords
distributor
fuel injection
injection pump
bore
pin
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
EP95115126A
Other languages
German (de)
English (en)
Other versions
EP0709568A1 (fr
Inventor
Wolfgang Fehlmann
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 EP0709568A1 publication Critical patent/EP0709568A1/fr
Application granted granted Critical
Publication of EP0709568B1 publication Critical patent/EP0709568B1/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
    • F02M59/44—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
    • 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
    • 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
    • F02M41/02—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements
    • F02M41/06—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements the distributor rotating
    • 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

Definitions

  • the invention is based on a fuel injection pump according to the preamble of claim 1.
  • a screw is provided as a closure piece of the longitudinal bore emerging coaxially at the end face of the distributor, which screw is screwed into the end of the longitudinal bore there.
  • This represents a considerable effort since the end of the longitudinal bore must also be provided with a thread into which the screw is screwed.
  • additional safety measures must be provided so that the screw does not loosen during operation of the fuel injection pump and the longitudinal channel thus leaks to the outside.
  • the fuel injection pump according to the invention with the features of claim 1 has the advantage that the cylindrical pin used transversely to the axis is not loaded by the pressure acting on it in the direction of insertion, so that due to the pressure, the pin does not come loose from its anchoring in the distributor can.
  • the pin can be pressed into the bore in a conventional manner in a press fit or can be glued in place of it or in addition.
  • the pin itself also serves as part of a coupling for the rotary drive of the distributor if the part comprising the distributor is at the same time a coupling part which is driven by the drive of the fuel injection pump.
  • a double advantage is achieved. which consists in the fact that the pin is optimally secured against falling out and at the same time ensures the required drive of the distributor.
  • This solution can be used particularly advantageously in the case of so-called piston distributor injection pumps, in which the longitudinal channel opens directly into the pump work space at the foot of the distributor and then emerges shortly thereafter at the end face of the distributor and is closed there by the pin inserted transversely.
  • the configuration analogous to claims 4 and 5 can also be implemented according to claims 8 and 9.
  • FIG. 1 shows a partial longitudinal section through a fuel injection pump of the radial piston distributor pump type
  • FIG. 2 a partial view in section perpendicular to FIG. 1
  • FIG. 3 a section along the line III-III through the representation of FIG. 1
  • FIG. 4 a side view of the drive shaft with receptacles for the coupling part.
  • FIG. 1 shows a partial section through the parts of such a fuel injection pump that are essential for the use of the invention.
  • This consists of a distributor 2, which is mounted in a cylinder 3 of a cylinder liner 4 inserted into the housing 1 of the fuel injection pump and projects with a foot 6 protruding from the cylinder 3 into a fuel-filled interior 7 of the fuel injection pump.
  • Radial bores 8 are made in this foot, into which pump pistons 9 are inserted, which with their inner end face 10 enclose a common pump working space 11 with respect to one another.
  • a roller shoe 12 lies against the pump piston, each with a roller 14, which run on a cam track 15 of a cam ring 16 comprising the distributor.
  • the cam ring is symmetrical to a radial plane defined by the axes of the pump pistons 9, is essentially stationary and is adjusted in the circumferential direction by an injection adjuster 18 to change the start of the pump piston stroke. It is supported radially with its peripheral surface in the pump housing.
  • the distributor together with the roller shoes represents the moving part of the cam drive of the fuel injection pump.
  • the distributor is driven by a drive shaft 19 of the fuel injection pump, which is synchronized with the internal combustion engine in a manner not shown is driven.
  • this embodiment consists of a head 20 which has axial longitudinal slots 22 from the front side 21, into which the roller shoes 12 can be inserted from the front side 21 and are guided radially displaceably in the slots.
  • a part 23 of reduced diameter adjoins the end face 21 and serves to receive a ball bearing 25, as can be seen in FIG. 1.
  • This is secured to the wider part 20 of the head by a locking ring 26.
  • the drive shaft is thus guided on one side in a slide bearing 27 and on the other side in a ball bearing 25.
  • a clutch disc 29 is also provided which, as can be seen in FIG. 3, is of star-shaped design with radially projecting webs 30 corresponding to the number of longitudinal slots 22 and the number of pump pistons with roller shoes. The webs have parallel side edges 31 and are guided over these in the slots 22.
  • the clutch disc has a circular opening 33, from which diametrically opposite recesses 34 extend. This opening 33, which is coaxial to the drive shaft, serves to receive a shaft journal 35 at the base of the distributor.
  • a longitudinal bore 37 is made in the distributor, which intersects the radial bores 8 in the area of the pump work chamber 11 and leads to a control point on the distributor in the form of a distributor groove 39 on the lateral surface of the distributor.
  • This distributor groove is alternately connected to an injection line 40 with a respective delivery stroke of the pump piston 9, which leads to an injection valve on the associated one Internal combustion engine leads.
  • the fuel delivered by the pump pistons 9 during their inward stroke, forced by the cams 41 of the cam track, is to be fed to one of these injection lines under high pressure.
  • the longitudinal bore 37 is closed in the area of the shaft journal 35, and a filling and relief line 42 starting from the distributor groove 39 is closed by a valve member 43 of a solenoid valve, not shown, in order to generate the high-pressure delivery stroke.
  • the valve member 43 is opened.
  • the longitudinal bore in the area of the shaft journal is closed by a pin 45 which, as can be seen more clearly in FIG. 2, is inserted into a bore 46 running transversely to the longitudinal axis of the distributor.
  • This bore cuts the longitudinal bore 37 over its entire cross section and has a diameter which is at least as large as the diameter of the longitudinal bore 37, but is preferably larger.
  • the pin inserted into this bore thus closes the longitudinal bore 37 completely tight.
  • the pin 45 is only radially loaded by the high pressure prevailing in the longitudinal bore 37 in such a way that no axial force component is exerted on the pin which could drive it out. The forces holding the pin in the bore 46 can thus be low.
  • the pin can be fitted in a known manner with an interference fit, but for safety's sake it can also be glued in, with larger fitting tolerances being permitted. So that the pin cannot also move out of the bore 46 due to shaking stresses that occur in the distributor pump during its operation, the clutch disc 29 is advantageously arranged in such a way that it lies in the plane of the longitudinal axis of the pin 45 and with its opening 33 directly adjoins the shaft journal and thus also on the end faces of the pin 45.
  • the breakthrough can initially be a breakthrough adapted to the cross-sectional shape of the shaft journal be. Is the shaft journal z. B. provided with shaped surfaces, via which the clutch disc is to be coupled, this carries the same shaped surface in the area of the opening.
  • the pin 45 can also serve as part of the coupling between the distributor and the drive in addition to its function of closing the longitudinal axis.
  • the shaft journal 35 is, for example, circular in cross section and the pin is designed such that it is longer than the shaft journal diameter according to FIG. that when the clutch disc 29 is driven through the slot 22 on the drive shaft 19, its movement is transmitted to the distributor 2 via the pin 47.

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 (9)

  1. Pompe à injection de carburant comportant un distributeur (2) entraîné en rotation par l'arbre moteur (19) de la pompe, ce distributeur ayant un perçage longitudinal (37) sensiblement dans la direction de l'axe du distributeur, qui relie une chambre haute pression (11) à un point de commande (39) du distributeur (2) et qui est réalisé dans le distributeur à partir d'une face frontale (36) du distributeur, puis fermé vers l'extérieur par une pièce de fermeture (45),
    caractérisée en ce que
    la pièce de fermeture est une broche cylindrique (45) ajustée et bloquée en coulissement dans un perçage (46) coupant le perçage longitudinal (37) transversalement à l'axe du distributeur (2) et dont le diamètre est au moins égal au diamètre du perçage longitudinal.
  2. Pompe à injection de carburant selon la revendication 1,
    caractérisée en ce que
    la broche (45) est enfoncée de force dans le perçage (46).
  3. Pompe à injection de carburant selon la revendication 1 ou 2,
    caractérisée en ce que
    la broche (45) est collée dans le perçage (46).
  4. Pompe à injection de carburant selon les revendications 1 à 3,
    caractérisée en ce que
    dans le plan radial de l'axe de distributeur, il est prévu une pièce (29) entourant le distributeur (2) par rapport à l'axe de distributeur, cette pièce s'opposant par une paroi limite tournée vers le distributeur, au déplacement de la broche (45) du perçage (46).
  5. Pompe à injection de carburant selon la revendication 4,
    caractérisée en ce que
    la broche (45) est plus longue que le perçage (46) et vient prendre avec au moins une partie (47) dépassant du perçage, comme organe d'entraînement, dans une cavité (34) de la pièce adjacente à la périphérie du distributeur, en forme de pièce de couplage (29), et qui assure au moins indirectement le couplage du distributeur (2) à l'arbre d'entraînement (19) de la pompe à injection pour sa rotation.
  6. Pompe à injection de carburant selon la revendication 5,
    caractérisée en ce que
    la broche dépasse par ses deux extrémités du perçage (46) d'une même longueur et vient prendre à ce niveau, de manière correspondante dans chaque fois une cavité (34) de la pièce de couplage (29).
  7. Pompe à injection de carburant selon l'une des revendications précédentes,
    caractérisée en ce que
    les pistons (9) de la pompe à injection sont prévus dans des perçages radiaux (8) dirigés radialement par rapport à l'axe du distributeur (2), qui englobent entre eux par leurs faces frontales tournées l'une vers l'autre dans le distributeur (2), une chambre active de pompe (11), commune, reliée comme chambre de pression au point de commande (39) par le perçage longitudinal (37) réalisé comme perçage coupant la chambre de travail et sa sortie se trouve dans la face frontale (36) du distributeur (2) dans un élément d'axe (35) du distributeur.
  8. Pompe à injection de carburant selon la revendication 7,
    caractérisée en ce que
    l'élément d'axe (35) est entouré par une pièce (29) mobile avec le distributeur.
  9. Pompe à injection de carburant selon la revendication 8,
    caractérisée en ce que
    la pièce mobile (29) est une pièce munie d'au moins une cavité (34) dirigée radialement vers l'élément d'axe (35) dans laquelle vient prendre au moins une extrémité de la broche (45) sortant de l'élément d'axe (35), qui relie le distributeur (2) par la pièce mobile (29) servant de pièce de couplage avec l'entraînement (19) du distributeur (2).
EP95115126A 1994-10-26 1995-09-26 Pompe d'injection de combustible Expired - Lifetime EP0709568B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4438251A DE4438251A1 (de) 1994-10-26 1994-10-26 Kraftstoffeinspritzpumpe
DE4438251 1994-10-26

Publications (2)

Publication Number Publication Date
EP0709568A1 EP0709568A1 (fr) 1996-05-01
EP0709568B1 true EP0709568B1 (fr) 1997-09-03

Family

ID=6531749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95115126A Expired - Lifetime EP0709568B1 (fr) 1994-10-26 1995-09-26 Pompe d'injection de combustible

Country Status (6)

Country Link
US (1) US5782619A (fr)
EP (1) EP0709568B1 (fr)
JP (1) JP3738064B2 (fr)
KR (1) KR100373807B1 (fr)
DE (2) DE4438251A1 (fr)
ES (1) ES2106604T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6415769B1 (en) 2000-04-24 2002-07-09 Blue Chip Diesel Performance Performance enhancing system for electronically controlled engines

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3107661A (en) * 1962-07-23 1963-10-22 Cav Ltd Liquid fuel pumps for internal combustion engines
GB1046951A (en) * 1964-02-25 1966-10-26 Cav Ltd Liquid fuel injection pumps for use with internal combustion engines
GB1486931A (en) * 1974-01-04 1977-09-28 Cav Ltd Liquid fuel injection pumping apparatus
US4040405A (en) * 1975-06-10 1977-08-09 Nippon Soken, Inc. Fuel injection system for internal combustion engine
GB2012864B (en) * 1978-12-18 1982-05-26 Lucas Industries Ltd Fuel pumping apparatus
GB2086490B (en) * 1980-11-01 1984-08-08 Lucas Industries Ltd Liquid fuel injection pumping apparatus
US4453896A (en) * 1980-12-17 1984-06-12 The Bendix Corporation Distributor pump with floating piston single control valve
US4446835A (en) * 1980-12-31 1984-05-08 Lucas Industries Limited Liquid fuel injection pumping apparatus
JPS5835260A (ja) * 1981-08-28 1983-03-01 Hitachi Ltd 分配型燃料噴射ポンプ
GB2116263B (en) * 1982-02-20 1985-10-09 Lucas Ind Plc Fuel injection pumping apparatus
GB8513282D0 (en) * 1985-05-28 1985-07-03 Lucas Ind Plc Fuel injection pumping apparatus
GB8613409D0 (en) * 1986-06-03 1986-07-09 Lucas Ind Plc Fuel injection pumps
JP2705779B2 (ja) * 1989-02-01 1998-01-28 ヤマハ発動機株式会社 ２サイクルエンジンの潤滑構造
US5617826A (en) * 1995-02-06 1997-04-08 Performance Corporation Synchronized compression ignition engine

Also Published As

Publication number Publication date
JPH08210214A (ja) 1996-08-20
DE4438251A1 (de) 1996-05-02
KR100373807B1 (ko) 2003-05-09
EP0709568A1 (fr) 1996-05-01
US5782619A (en) 1998-07-21
KR960014637A (ko) 1996-05-22
JP3738064B2 (ja) 2006-01-25
DE59500600D1 (de) 1997-10-09
ES2106604T3 (es) 1997-11-01

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