EP1431577B1 - Pompe à carburant - Google Patents

Pompe à carburant Download PDF

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Publication number
EP1431577B1
EP1431577B1 EP03257949A EP03257949A EP1431577B1 EP 1431577 B1 EP1431577 B1 EP 1431577B1 EP 03257949 A EP03257949 A EP 03257949A EP 03257949 A EP03257949 A EP 03257949A EP 1431577 B1 EP1431577 B1 EP 1431577B1
Authority
EP
European Patent Office
Prior art keywords
pump
fuel
camshaft
cam
plunger
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
EP03257949A
Other languages
German (de)
English (en)
Other versions
EP1431577A1 (fr
Inventor
Peter A.G. Collingborn
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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Filing date
Publication date
Application filed by Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP1431577A1 publication Critical patent/EP1431577A1/fr
Application granted granted Critical
Publication of EP1431577B1 publication Critical patent/EP1431577B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • F04B1/0536—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders with two or more serially arranged radial piston-cylinder units
    • F04B1/0538—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders with two or more serially arranged radial piston-cylinder units located side-by-side

Definitions

  • each drive member is of part-cylindrical form.
  • the main housing opening has a correspondingly shaped wall for cooperation with said part-cylindrical outer surfaces.
  • the pump head has an underside for abutment with the main pump housing.
  • the inner surface of each drive member is also of part-cylindrical form.
  • the outer walls have a greater degree of curvature than the inner walls, and the radius of the outer walls is preferably selected to be less than half the overall width of the drive member.
  • the rear bearing journal preferably has a diameter greater than that of the front bearing journal, said rear bearing journal diameter being equal to or greater than the diameter of the main housing opening to permit direct mounting of the rear bearing journal upon, or support of the rear bearing journal by, the main housing.
  • Each inlet passage 64 is provided with a respective inlet valve arrangement including an inlet valve 66 that is operable in response to the pressure difference between fuel in the inlet supply passage 64 and fuel within the respective pump chamber 23, 25, 27 to move between open and closed states.
  • an inlet valve 66 When an inlet valve 66 is in its open state, fuel is supplied through the inlet supply passage 64 to the pump chamber and when the inlet valve 66 is in its closed state the supply of fuel to the pump chamber is prevented.
  • the pump head 34 is provided with a common high pressure supply passage 72, which is oriented substantially perpendicular to the inlet passages 64 and which extends axially from the rear of the pump.
  • the high pressure supply passage 72 receives high pressure fuel from the delivery passages from each pump chamber 23, 25, 27 and supplies fuel from the pump to a downstream common rail or other accumulator volume for fuel.
  • case hardened alloy steel from which the pump head 134 is formed, are superior to those of cast iron.
  • the main pump housing 10 may be formed from aluminium, for example, rather than cast iron. This provides a manufacturing advantage as a cheaper and more accurate process can be used to form the housing 10, for example die casting.
  • the second and third cams 18, 20 are formed integrally with the shaft 12, but as it is difficult to machine all three cams 16, 18, 20 to be integral with the shaft 12 the first cam 20 is a separate part.
  • the first cam 16 forms an interference fit with the shaft 12 and is of larger diameter than the third cam 20 so that, upon assembly, the shaft is able to pass through it while retaining enough strength in the cam 16 to implement the required interference fit.
  • the axial length of the rear bearing journal 76 (i.e. the length of the journal 76 along the axis of the shaft 12) is less than that of the front bearing journal 74 so as to limit the overall axial length of the assembly.
  • the diameter of the rear bearing journal 76 is selected to be equal to or greater than the diameter of the main housing bore 13 to enable the journal 76 to be supported by or mounted upon the housing 10 without a requirement for an intermediate component or components.
  • a temporary tool such as a rod, that extends through the openings of these components.
  • the rod is a close fit with the openings and serves to locate the components in their correct angular and axial positions relative to the shaft, prior to insertion of the camshaft, which when inserted forms an interference fit in the openings and supports the aforementioned parts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (17)

  1. Pompe à essence destinée à être utilisée dans la délivrance de carburant à une rampe commune à haute pression d'un moteur à combustion interne, la pompe à essence comprenant :
    au moins des première et deuxième unités de pompe (2, 4, 6) qui sont espacées axialement le long d'un arbre à cames (12) afin de former un ensemble de pompes en ligne, dans laquelle chaque unité de pompe comprend un piston plongeur de pompage (22, 24, 26), un élément d'entraînement (48, 50, 52) qui peut coopérer avec le piston plongeur de pompage et est entraîné, lors de son utilisation, par une disposition de cames associées (16, 18, 20) afin de communiquer un entraînement au piston plongeur lors de la rotation de l'arbre à cames, et un corps de pompe (23, 25, 27) à l'intérieur duquel le carburant est sous pression pour une délivrance à la rampe commune à haute pression,
    dans laquelle le corps de pompe (23, 25) des première et deuxième unités de pompe (2, 4) sont disposées à l'intérieur d'une tête de pompe commune (34), qui est montée sur un boîtier principal de pompe (10) présentant une ouverture de boîtier principal (13) à travers laquelle l'arbre à cames (12) s'étend et dans laquelle la tête de pompe définit un passage d'alimentation à haute pression vers lequel le carburant sous pression est délivré à partir de chacun des corps de pompe et à partir duquel le carburant sous pression alimente la rampe commune à haute pression, en utilisation.
  2. Pompe à essence selon la revendication 1, comprenant des première, deuxième et troisième unités de pompe (2,4, 6) espacées axialement le long de l'arbre à cames (12).
  3. Pompe à essence selon la revendication 2, dans laquelle la tête de pompe (34) est munie d'un premier, d'un deuxième et d'un troisième alésages de piston plongeur (28, 30, 32) à l'intérieur desquels le piston plongeur de pompage (22, 24, 26) d'une des première, deuxième et troisième unités de pompe respectives (2, 4, 6) est mobile.
  4. Pompe à essence selon la revendication 3, dans laquelle le boîtier principal de pompe (10) est muni d'une ouverture supplémentaire (11) et la tête de pompe comprend une saillie (34a) qui s'étend dans l'ouverture supplémentaire, pour ainsi fournir une longueur accrue pour les premier, deuxième et troisième alésages de piston plongeur (28, 30, 32).
  5. Pompe à essence selon la revendication 3 ou 4, dans laquelle l'ouverture du boîtier principal (13) est profilée pour une coopération avec une surface extérieure (56) de chacun des éléments d'entraînement (48, 50, 52) pour guider un mouvement axial des éléments d'entraînement, mais pour sensiblement empêcher le mouvement latéral et angulaire de ceux-ci.
  6. Pompe à essence selon la revendication 4 ou 5, dans laquelle la surface extérieure (56) de chaque élément d'entraînement (48, 50, 52) est de forme partiellement cylindrique, et dans laquelle l'ouverture supplémentaire (11) dans le boîtier principal de pompe (34) présente une paroi profilée de manière correspondante pour une coopération avec lesdites surfaces extérieures partiellement cylindriques (56).
  7. Pompe à essence selon l'une quelconque des revendications 1 à 4, dans laquelle la tête de pompe (34) est profilée pour une coopération avec une surface extérieure (56) de chacun des éléments d'entraînement (48, 50, 52) pour guider le mouvement axial des éléments d'entraînement dans une course avant sensiblement complète de chaque élément d'entraînement, mais pour sensiblement empêcher un mouvement latéral et angulaire des éléments d'entraînement.
  8. Pompe à essence selon la revendication 7, dans laquelle la tête de pompe (34) est munie d'une extension de jupe (75) qui est profilée pour une coopération avec les surfaces extérieures (56) des éléments d'entraînement (48, 50, 52) afin de guider ledit mouvement axial de ceux-ci.
  9. Pompe à essence selon la revendication 7 ou 8, dans laquelle les surfaces extérieures (56) des éléments d'entraînement (48, 50, 52) sont de forme partiellement cylindrique.
  10. Pompe à essence selon l'une quelconque des revendications 5 à 9, dans laquelle les surfaces extérieures (56) des éléments d'entraînement (48, 50, 52) sont de forme partiellement cylindrique de rayon R1, où R1 est inférieur à la moitié de la largeur W de l'élément d'entraînement.
  11. Pompe à essence selon l'une quelconque des revendications 1 à 10, dans laquelle l'élément d'entraînement (48, 50, 52) de chaque unité de pompe revêt la forme d'un poussoir qui peut coopérer, en utilisation, avec un coulisseau d'anneau de came (36, 38, 40) de la disposition de cames associées (16, 18, 20) pour communiquer un mouvement au piston plongeur associé (22, 24, 26) lors de la rotation de l'arbre à cames (12).
  12. Pompe à essence selon l'une quelconque des revendications 1 à 11, dans laquelle la tête de pompe (34) est munie d'au moins de première et deuxième canalisations de refoulement d'entrée (64) destinées à délivrer du carburant aux corps de pompe (23, 25) des première et deuxième unités de pompe (2, 4), dans laquelle les canalisations d'entrée sont disposées sensiblement parallèles les unes aux autres et sensiblement perpendiculaires à la canalisation de refoulement à haute pression (68).
  13. Pompe à essence selon l'une quelconque des revendications 1 à 12, comprenant au moins une première et une deuxième dispositions de cames (16, 18) destinées à communiquer un entraînement au piston plongeur de pompage (22, 24) des première et deuxième unités de pompe associées (2, 4), les première et deuxième dispositions de cames associées étant espacées axialement le long de l'arbre à cames (12).
  14. Pompe à essence selon la revendication 13, comprenant des première, deuxième et troisième dispositions de cames comprenant respectivement des première, deuxième et troisième cames (16, 18, 20), dans laquelle les première et deuxième cames (16, 18) sont intégralement formées avec l'arbre à cames (12) et la troisième came (20) est un composant séparé, les première, deuxième et troisième cames (16, 18, 20) étant disposées axialement le long de l'arbre à cames (12).
  15. Pompe à essence selon la revendication 14, dans laquelle des tourillons de coussinets avant (74) et arrière (76) sont fournis sur l'arbre à cames (12) dans un ajustement avec serrage pour définir respectivement des première et deuxième surfaces de coussinet pour une extrémité respective des cames (16, 18, 20).
  16. Pompe à essence selon la revendication 15, dans laquelle le tourillon de coussinet arrière (76) présente un diamètre supérieur à celui du tourillon de coussinet avant (74), ledit diamètre du tourillon de coussinet arrière étant supérieur ou égal au diamètre de l'ouverture du boîtier principal (13) pour permettre un montage direct du tourillon de coussinet arrière (76) sur ou supporter le tourillon de coussinet arrière par le boîtier principal.
  17. Pompe à essence selon l'une quelconque des revendications 14 à 16, dans laquelle chacune des première, deuxième et troisième dispositions de cames comprend un élément de coulisseau de came (36, 38, 40) de forme tubulaire qui est entraîné, lors de son utilisation, par l'une des cames associées (16, 18, 20) et qui sert à communiquer un entraînement à l'élément d'entraînement associé (48, 50, 52) alors qu'il avance sur la surface de la came associée.
EP03257949A 2002-12-17 2003-12-17 Pompe à carburant Expired - Lifetime EP1431577B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0229367 2002-12-17
GBGB0229367.8A GB0229367D0 (en) 2002-12-17 2002-12-17 Fuel Pump

Publications (2)

Publication Number Publication Date
EP1431577A1 EP1431577A1 (fr) 2004-06-23
EP1431577B1 true EP1431577B1 (fr) 2006-03-08

Family

ID=9949823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03257949A Expired - Lifetime EP1431577B1 (fr) 2002-12-17 2003-12-17 Pompe à carburant

Country Status (4)

Country Link
EP (1) EP1431577B1 (fr)
AT (1) ATE319930T1 (fr)
DE (1) DE60303899T2 (fr)
GB (1) GB0229367D0 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007083404A1 (fr) * 2006-01-20 2007-07-26 Bosch Corporation Système d'injection de carburant pour moteur à combustion interne
JP4983593B2 (ja) * 2007-04-10 2012-07-25 日産自動車株式会社 燃料ポンプの駆動装置
CN107299888B (zh) * 2016-04-15 2020-10-16 罗伯特·博世有限公司 静液压的径向柱塞机

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687426A (en) * 1984-07-31 1987-08-18 Fuji Techno Kogyo Kabushiki Kaisha Constant volume pulsation-free reciprocating pump
GB9815272D0 (en) * 1998-07-14 1998-09-09 Lucas Ind Plc Positive displacement pumps
JP2001221118A (ja) * 2000-02-07 2001-08-17 Bosch Automotive Systems Corp 燃料噴射装置
GB2366336A (en) * 2000-08-31 2002-03-06 Delphi Tech Inc Fuel pump

Also Published As

Publication number Publication date
ATE319930T1 (de) 2006-03-15
EP1431577A1 (fr) 2004-06-23
DE60303899T2 (de) 2006-11-30
GB0229367D0 (en) 2003-01-22
DE60303899D1 (de) 2006-05-04

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