EP0301222B1 - Pompe d'injection de combustible pour moteurs à combustion interne - Google Patents

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

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Publication number
EP0301222B1
EP0301222B1 EP88109629A EP88109629A EP0301222B1 EP 0301222 B1 EP0301222 B1 EP 0301222B1 EP 88109629 A EP88109629 A EP 88109629A EP 88109629 A EP88109629 A EP 88109629A EP 0301222 B1 EP0301222 B1 EP 0301222B1
Authority
EP
European Patent Office
Prior art keywords
shoe
fuel injection
injection pump
pump according
rider
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
EP88109629A
Other languages
German (de)
English (en)
Other versions
EP0301222A3 (en
EP0301222A2 (fr
Inventor
Wolfgang Eckell
Josef Güntert
Walter Häfele
Manfred Dipl.-Ing. Krämer
Uwe Kuhn
Johann 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
Priority claimed from DE19873724662 external-priority patent/DE3724662A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0301222A2 publication Critical patent/EP0301222A2/fr
Publication of EP0301222A3 publication Critical patent/EP0301222A3/de
Application granted granted Critical
Publication of EP0301222B1 publication Critical patent/EP0301222B1/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
    • 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
    • F02M59/243—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movement of cylinders relative to their pistons
    • F02M59/246—Mechanisms therefor
    • 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 according to the generic preamble of claim 1.
  • Fuel injection pumps of this type which are usually designed as multi-cylinder pumps with a number of pump elements, have the problem of the exact assignment of the individual control spools if, as from the older one, they have a fuel injection pump with the generic features and with WO 87/05969 published European patent application No. 87 901 394.4 known by the twist shaft to change the delivery or injection start time or at another, z. B. from US Pat. No. 3,385,221 known application to change the injection quantity together.
  • the fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage that the slide shoe is axially guided in very narrow tolerances due to the length of the cylindrical pin defined by the distance of the head from the counter-stop and is axially secured without any restriction of its torsional mobility. This ensures that the line of contact between the slide shoe and the corresponding transverse groove surface is always at the same point, depending on the rotational position of the rotating shaft, so that an exact repeatability of the individual control positions is guaranteed depending on a predetermined rotational position. A better axial guidance also prevents the sliding block from slipping back and forth in the end positions and thus increasing possible errors.
  • the head has at least one lateral flattening, whereby a guide surface is obtained, and according to a further advantageous embodiment of the invention, at least one elevation is present on the end face of the sliding shoe facing the pump piston, which corresponds to the flattening of the head , a limited torsional backlash, prevents rotation of the sliding block on the cylindrical pin.
  • the head has at least one projection that radially exceeds the pin, which is narrower than the pin diameter and wherein the central bore in the slide shoe has a radial expansion, so that the slide shoe can be plugged onto the adjustment bolt via the projection and can be axially secured by twisting through a certain angle on the pin through the now extending projection.
  • the head is preferably flattened accordingly on two sides, to be precise except for a bar width that is narrower than the diameter of the cylindrical pin.
  • a three-hooked anchor can also be used instead of a two-hooked one, in which case the head is designed accordingly and there are also three widenings in the central bore for attaching the slide shoe.
  • a control slide 9 is axially displaceable in the recesses of the cylinder liners 2 and is used in all the exemplary embodiments described for the delivery or injection start control.
  • a change in the delivery rate is controlled by the axial displacement of the control slide.
  • the suction chamber 8 is closed at the longitudinal ends by end shields 11, one of which is shown in plan view and in which a rotating shaft 12 arranged in the suction chamber 8 is mounted.
  • control slide 9 So that the control slide 9 is secured against rotation during its axial displacement on the pump piston 3 and an exact assignment of the oblique grooves 24 to the radial bores 25 is ensured, the control slide 9 has a nose 26 with which it engages in a longitudinal groove 27 of the cylinder liner 2 .
  • This fuel injection pump works as follows: Towards the end of the suction stroke or in its UT position of the pump piston 3, fuel flows through the oblique grooves 24, the transverse bore 23 and the blind bore 22 and also through the suction bore 32 into the pump work chamber 18 and fills it up. As soon as, after the camshaft 6 has been rotated further, the roller tappet 4 is pushed upwards over the roller 5, the pump piston 3 displaces fuel from the pump work chamber 18. As long as the oblique grooves 24 with the blind holes 20 are completely immersed in the control slide 9, the delivery takes place from the pump work space 18 via the path described back to the suction space 8, initially also one certain amount is displaced back through the suction bore 32.
  • the angled rider 15, 115, 215 is clamped to the torsion shaft 12, 112 via a screw bolt 36, between the rider 15, 115 and the rotating shaft 12, 112 a spacer 37 and between the head of the bolt 36 and the rider 15, 115 a washer 38 is arranged.
  • the torsion shaft, the bolt and the washers are not shown.
  • the spacer 37 is selected in the thickness so that the individual adjustment bolts 14 or control slide 9 can be adjusted to one another in their basic position.
  • the head 44 of the adjusting bolt 14 has two flats 55, the remaining edge 56 of the head, in cooperation with the end face 46 of the sliding block 43, serving as an axial guide for the sliding block 43.
  • strip-shaped elevations 57 are arranged, the inner surfaces of which lie opposite the flats 55 and delimit with them a gap 58, the width of which determines the possible rotation of the slide shoe 43 on the cylindrical pin 42.
  • the rotation should be limited to about + - 5 degrees.
  • the head 144 is laterally flattened up to a remaining bar, so that, however, protrusions 45 protrude beyond the diameter of the cylindrical pin 142, which protrude from the sliding shoe 143 on its one end face 146 facing the pump piston reach behind.
  • a collar 47 Between the holding pin 141 of the adjusting bolt 14 and the cylindrical pin 142 there is a collar 47, the surface 154 of which serves as a counter-stop to the protrusions 45 of the head 144, the other end face of the slide shoe 143 faces.
  • the adjusting bolt 14 is anchored releasably in the fastening bore 239 of the slide 215.
  • a cross pin 58 is provided, which is arranged in a continuous bore 59, which passes through the holding pin 241 and corresponding sections of the slide 215 for receiving the cross pin 58.

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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)

Claims (14)

  1. Pompe d'injection de carburant pour moteurs à combustion interne avec au moins un élément de pompe disposé dans un carter de pompe (1) et comportant un piston de pompe (3) entraîné de préférence par un arbre à came (6) ainsi qu'un cylindre de pompe (2) et délimitant une chambre de travail (18) de la pompe, avec un tiroir de commande (9) susceptible de coulisser axialement sur le piston de pompe (3) et commandant au moins un orifice de commande (20, 24) disposé sur la surface enveloppe du piston de pompe (3) d'un canal de décharge s'étendant dans le piston de pompe (3) et qui est en communication avec la chambre de travail (18) de la pompe, avec un arbre de torsion (12) monté dans le carter de la pompe et prévu pour actionner le tiroir de commande (9) pour le contrôle du début de refoulement ou de l'injection, ou bien de la quantité refoulée, et avec un axe de réglage (14) qui est disposé sur une pièce de fixation (15) fixée sur l'arbre de torsion (12) et qui vient en prise dans une gorge transversale (13) disposée sur le tiroir de commande (9), pour convertir ainsi le mouvement de rotation de l'arbre de torsion (12) en une course de déplacement du tiroir de commande (9), et cet axe de réglage comportant un tourillon cylindrique (42) sur lequel est monté par un alésage central (48) un patin (43) venant en prise dans la gorge transversal (13) et qui est bloqué contre un coulissement axial sur le tourillon (42), pompe d'injection de carburant caractérisée en ce que l'axe de réglage (14) comporte à l'extrémité libre du tourillon cylindrique (42, 142, 242), comme butée axiale pour le patin (43, 143, 243), une tête (44, 144, 244) venant en prise derrière ce patin, tandis que la pièce de fixation (15, 115, 215) comporte, en tant que contre-butée tournée vers la tête, une surface (54, 154, 254) et que le patin (43, 143, 243) est guidé avec un jeu axial réduit et est bloqué dans sa position de fonctionnement entre la tête et cette surface.
  2. Pompe d'injection de carburant selon la revendication 1, caractérisée en ce que la tête (44, 144) comporte au moins un méplat latéral (55) (figures 2 à 5).
  3. Pompe d'injection de carburant selon la revendication 2, caractérisée en ce que sur la face frontale (46) tournée vers le piston de pompe (3) du patin (43), est prévue au moins une saillie (57) qui constitue avec le méplat (55) de la tête (44), un blocage en rotation, permettant un jeu limité en rotation, du patin (43) sur le tourillon cylindrique (42), (figures 2 et 3).
  4. Pompe d'injection de carburant selon la revendication 3, caractérisée en ce que la saillie (57) est en forme de barrette et s'étend parallèlement au méplat (55).
  5. Pompe d'injection de carburant selon la revendication 1 ou la revendication 2, caractérisée en ce que la tête (144) comporte au moins une saillie (45) dépassant radialement le tourillon cylindrique (142) et qui est plus étroite que le diamètre de cet axe, et en ce que le perçage central (48) dans le patin (143) comporte au moins un élargissement radial (49), de sorte que le patin (143) peut être emmanché par dessus la saillie (45) sur le tourillon cylindrique (142) de l'axe de réglage (14), et en le faisant tourner d'un angle déterminé sur l'axe, peut être bloqué axialement par la saillie (45) venant alors en prise derrière lui (figures 4 et 5).
  6. Pompe d'injection de carburant selon la revendication 5, caractérisée en ce que la tête (144) est aplatie à l'exception d'une barre qui est plus étroite que le diamètre du tourillon cylindrique (142).
  7. Pompe d'injection de carburant selon la revendication 1, avec une pièce de fixation (215), revêtant la forme d'un cavalier, de l'axe de réglage (14), pompe caractérisée en ce que le patin (243) comporte au moins un aplatissement radial (62) qui coopère, en permettant un jeu limité en rotation, avec une saillie (63) de la pièce de fixation (215), saillie qui est voisine de l'aplatissement (62) et comporte une surface (64) parallèle à ce dernier.
  8. Pompe d'injection de carburant selon une des précédentes revendications, avec une pièce de fixation, revêtant la forme d'un cavalier (15, 115, 215), de l'axe de réglage (14), pompe caractérisée en ce que sur l'axe de réglage (14), est prévu un tourillon de maintien (41, 141, 241) étagé par rapport à le tourillon cylindrique (42, 142, 242) portant le patin (43, 143, 243), par lequel l'axe de réglage (14) est fixé sur le cavalier (15, 115, 215) dans un perçage de fixation (39, 139, 239) prévu dans celui-ci.
  9. Pompe d'injection de carburant selon la revendication 8, caractérisée en ce que l'axe de réglage (14) revêt avec le tourillon cylindrique (42, 242) portant le patin (43, 243), la forme d'un axe étagé, et en ce que le tourillon de maintien (41, 241) a un diamètre plus petit et est fixé sans pouvoir tourner dans le perçage de fixation (39, 139, 239) du cavalier, tandis que la longueur du tourillon cylindrique (42, 242) est déterminée par un épaulement (53, 253) ménagé entre le tourillon cylindrique et le tourillon de maintien.
  10. Pompe d'injection de carburant selon la revendication 8 ou la revendication 9, caractérisée en ce que l'axe de réglage (14) est ancré sur le cavalier (215) par une broche transversale (58) traversant le tourillon de maintien (241) et le cavalier (215).
  11. Pompe d'injection de carburant selon la revendication 8 ou la revendication 9, caractérisée en ce que le tourillon de maintien (141) est fixé par soudage au faisceau laser ou bien par brasage.
  12. Pompe d'injection de carburant selon la revendication 8 ou la revendication 9, caractérisée en ce que le tourillon de maintien (41) est riveté dans le perçage de fixation (39).
  13. Pompe d'injection de carburant selon une des revendications 9 à 12, caractérisée en ce qu'entre la surface d'épaulement (253) de l'axe de réglage (14) et la surface d'appui (60), placée en face de celle-ci, du cavalier (215) est disposée une rondelle de calage (61) qui comporte une surface (254) constituant une butée pour le patin (243).
  14. Pompe d'injection de carburant selon une des revendications 1 à 9 ou bien 12 à 14, caractérisée en ce que l'axe de réglage (14), contrairement au patin (43, 143) est constitué par un matériau plastiquement déformable (acier non trempé).
EP88109629A 1987-07-25 1988-06-16 Pompe d'injection de combustible pour moteurs à combustion interne Expired - Lifetime EP0301222B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873724662 DE3724662A1 (de) 1987-03-10 1987-07-25 Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3724662 1987-07-25

Publications (3)

Publication Number Publication Date
EP0301222A2 EP0301222A2 (fr) 1989-02-01
EP0301222A3 EP0301222A3 (en) 1990-02-07
EP0301222B1 true EP0301222B1 (fr) 1992-05-06

Family

ID=6332346

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88109629A Expired - Lifetime EP0301222B1 (fr) 1987-07-25 1988-06-16 Pompe d'injection de combustible pour moteurs à combustion interne

Country Status (4)

Country Link
US (1) US4840161A (fr)
EP (1) EP0301222B1 (fr)
JP (1) JPS6445959A (fr)
DE (1) DE3870748D1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3813320A1 (de) * 1988-04-08 1989-10-19 Voest Alpine Automotive Pumpenduese fuer dieselmotoren
DE3811845A1 (de) * 1988-04-08 1989-10-19 Voest Alpine Automotive Pumpeduese fuer dieselmotoren
DE4041656A1 (de) * 1990-12-22 1992-07-02 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE4143040C1 (fr) * 1991-12-24 1993-07-08 Robert Bosch Gmbh, 7000 Stuttgart, De
JPH10231763A (ja) * 1997-02-18 1998-09-02 Zexel Corp 燃料噴射ポンプ
DE19734196A1 (de) * 1997-08-07 1999-02-11 Hatz Motoren Regelvorrichtung sowie Verfahren zu deren Herstellung
JP4467469B2 (ja) * 2005-06-08 2010-05-26 ボッシュ株式会社 燃料供給用ポンプ及びタペット構造体
DE102007034036A1 (de) * 2007-07-20 2009-01-22 Robert Bosch Gmbh Kraftstoffhochdruckpumpe mit Rollenstößel

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1526725C3 (de) * 1966-08-01 1973-10-25 L'orange Kg, 7000 Stuttgart Mehrzylinder Kraftstoffeinspntz pumpe
US3712763A (en) * 1970-09-18 1973-01-23 Caterpillar Tractor Co Sleeve metering collar adjusting lever
DE3105738C2 (de) * 1981-02-17 1983-01-20 Daimler-Benz Ag, 7000 Stuttgart Vorrichtung zur Nacheinstellung des Förderbeginns einer Einspritzpumpe für eine Brennkraftmaschine
JPS5888468A (ja) * 1981-11-24 1983-05-26 Nissan Motor Co Ltd 内燃機関の点火装置
US4531492A (en) * 1984-03-27 1985-07-30 Caterpillar Tractor Co. Fuel injection timing and governor control apparatus
US4541391A (en) * 1984-03-27 1985-09-17 Caterpillar Tractor Co. Timing control for fuel injection apparatus
JPS6114743U (ja) * 1984-06-29 1986-01-28 株式会社ボッシュオートモーティブ システム 燃料噴射装置
DE3435987A1 (de) * 1984-10-01 1986-04-10 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
JPS61123756A (ja) * 1984-11-16 1986-06-11 Diesel Kiki Co Ltd 燃料噴射ポンプ
DE3447375A1 (de) * 1984-12-24 1986-07-03 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3447374A1 (de) * 1984-12-24 1986-07-10 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3522451A1 (de) * 1985-06-22 1987-01-02 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3546222A1 (de) * 1985-12-27 1987-07-02 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3707646A1 (de) * 1986-03-24 1987-10-08 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
US4737086A (en) * 1986-05-27 1988-04-12 Diesel Kiki Co., Ltd. Fuel injection pump having variable prestroke mechanism
DE3644147A1 (de) * 1986-12-23 1988-07-07 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen

Also Published As

Publication number Publication date
JPS6445959A (en) 1989-02-20
DE3870748D1 (de) 1992-06-11
EP0301222A3 (en) 1990-02-07
EP0301222A2 (fr) 1989-02-01
US4840161A (en) 1989-06-20

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