EP2271838B1 - Pompe, en particulier pompe à carburant haute pression - Google Patents

Pompe, en particulier pompe à carburant haute pression Download PDF

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Publication number
EP2271838B1
EP2271838B1 EP09726240A EP09726240A EP2271838B1 EP 2271838 B1 EP2271838 B1 EP 2271838B1 EP 09726240 A EP09726240 A EP 09726240A EP 09726240 A EP09726240 A EP 09726240A EP 2271838 B1 EP2271838 B1 EP 2271838B1
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EP
European Patent Office
Prior art keywords
pump
pump piston
tappet
disc
drive shaft
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.)
Active
Application number
EP09726240A
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German (de)
English (en)
Other versions
EP2271838A1 (fr
Inventor
Friedrich Boecking
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2271838A1 publication Critical patent/EP2271838A1/fr
Application granted granted Critical
Publication of EP2271838B1 publication Critical patent/EP2271838B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04B1/0404—Details or component parts
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
    • 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
    • F04B1/0404—Details or component parts
    • F04B1/0439—Supporting or guiding means for the pistons

Definitions

  • the invention relates to a pump, in particular a high-pressure fuel pump, according to the preamble of claim 1.
  • Such a pump is through the DE 103 13 745 A1
  • This pump has at least one pump element which has a pump piston which is driven at least indirectly by a drive shaft in a stroke movement.
  • the pump piston is guided in a cylinder bore of a housing part of the pump, wherein the housing part has a cylindrical portion surrounding the cylinder bore.
  • a cup-shaped plunger is arranged, which has a bottom facing the drive shaft and a jacket adjacent thereto.
  • the jacket of the plunger is slidably guided on the cylindrical portion of the housing part, wherein a spring is provided, through which the plunger is acted upon to the drive shaft, and wherein the pump piston with its drive shaft facing end face abuts the bottom of the plunger on the pump piston is in its end portion facing the bottom of the plunger secures a disk having a larger outer diameter than the pump piston.
  • the pump piston is secured to the disc in the plunger by means of a securing element acting on the disc in the direction of the longitudinal axis of the pump piston. As a fuse element serves the spring through which the disc is held in contact with the bottom of the plunger. However, this may not achieve sufficient assurance of the connection of the pump piston with the plunger under certain circumstances
  • the pump according to the invention with the features of claim 1 has the advantage that a reliable assurance of the connection of the pump piston is achieved with the plunger with a simple design fuse element.
  • the pump piston can be produced in a particularly simple manner. With the feature according to claim 5, a simple attachment of the disc on the pump piston is possible.
  • FIG. 1 a pump in a longitudinal section
  • FIG. 2 a section of the pump in a cross section along line II-II in FIG. 1 in an enlarged view.
  • the pump has a housing 10, which may be formed in several parts and in which a rotationally driven drive shaft 14 is rotatably mounted about an axis of rotation 15.
  • the drive shaft 14 has at least one eccentric 16, which is formed eccentrically to the rotation axis 15 of the drive shaft 14.
  • the drive shaft 14 may also have at least one cam instead of the eccentric 16.
  • the pump has at least one or more pump elements 18, each with a pump piston 20, by the eccentric 16 or cam of the drive shaft 14 is driven at least indirectly in a lifting movement in at least approximately radial direction to the axis of rotation 15 of the drive shaft 14. It can also be provided that the pump does not have its own drive shaft 14 and the pump piston 20 of the pump element 18 is driven by a shaft of the internal combustion engine having an eccentric 16 or cam.
  • the pump piston 20 is tightly guided in a cylinder bore 22 of a housing part 24 of the pump. With its end facing away from the drive shaft 14, the pump piston 20 in the cylinder bore 22 defines a pump working space 26.
  • the pump working space 26 has a connection with an inlet 34 leading from a feed pump 32 via which the pump working space 26 is connected via an inlet check valve 30 radially inward to the axis of rotation 15 of the drive shaft 14 directed suction stroke of the pump piston 20 is filled with fuel.
  • the pump working chamber 26 also has an outlet check valve 36 which opens out of this connection with a drain 38 which leads, for example, to a high-pressure fuel accumulator 40 and fuel via the delivery stroke of the pump piston 20 directed radially outward from the rotational axis 15 of the drive shaft 14 the pump working space 26 is displaced.
  • the housing part 24 has a flange-like region 42, which rests on the housing part 12, and a cylindrical portion 44 protruding from the region 42.
  • the cylinder bore 22 extends from the end face of the portion 44 through the portion 44 into the region 42, where the pump working space 26 is arranged.
  • the inlet valve 30 and the outlet valve 36 are arranged in the area 42.
  • a centering collar 43 larger in diameter than the section 44 is provided, which enters into a bore 46 in the housing 12 with little play and ensures centering of the housing part 24 with respect to the housing 12.
  • a cup-shaped plunger 50 is arranged between the pump piston 20 and the eccentric 16 or cam of the drive shaft 14, a cup-shaped plunger 50 is arranged.
  • the pestle 50 has a bottom 52 facing the drive shaft 14 and a shell 54 adjoining it from the drive shaft 14, wherein the bottom 52 and the shell 54 may be formed integrally or as separate, interconnected components.
  • the jacket 54 of the plunger 50 is slidably guided on the cylindrical portion 44 of the housing part 24 with little play.
  • the longitudinal axis of the plunger 50 is at least approximately identical to the longitudinal axis 23 of the cylinder bore 22 and the longitudinal axis of the pump piston 20. From the casing 54 of the plunger 50 protrudes near the bottom 52, an annular collar 56 to the outside, between and the flange 42 of the housing part 24th a biased spring 58 is clamped, which is preferably a helical compression spring.
  • the pump piston 20 has a constant diameter over its entire length and protrudes with its end facing the drive shaft 14 out of the cylinder bore 22. Near the end of the pump piston 20 protruding from the cylinder bore 22, a larger disk 60, larger in outer diameter than the pump piston 20, is fastened thereto.
  • the disk 60 is preferably pressed onto the pump piston 20.
  • the disc 60 may as in FIG. 2 shown in their voltage applied to the pump piston 20 radially inner region having a greater thickness than in its radially outer region, thereby forming the bottom 52 of the plunger 50 toward the disc 60, a step is formed.
  • the end of the pump piston 20 protrudes slightly beyond the disk 60 in the direction of the longitudinal axis 23, so that the end face 21 of the pump piston 20 bears against the bottom 52, while the disk 60 is arranged at a short distance from the bottom 52.
  • the outer diameter of the disc 60 is slightly smaller than the inner diameter of the shell 54 of the plunger 50 in the region in which the disc 60 is disposed within the shell 54. It can be provided that the inner diameter of the jacket 54 in the region in which the disc 60 is arranged, is slightly smaller than in the region guided on the cylindrical portion 44 of the jacket 54. In this way, the jacket 54 in the region of the disc 60th a greater wall thickness than in its guided on the section 44 area.
  • a circumferential annular groove 62 introduced, in which a securing element 64 is inserted, which engages over the disk 60 on the bottom 52 of the plunger 50 side facing away radially inwardly.
  • the securing element 64 is preferably designed as an elastic spring ring, which is locked in the annular groove 62 by its bias radially outward.
  • the plunger 50 has at least one, preferably a plurality of openings 66 and the disc 60 has in its region between the pump piston 20 and the shell 54 of the plunger 50 at least one, preferably a plurality of openings 67.
  • a ring 70 may be rotatably supported, on which the plunger 50 rests with its bottom 52.
  • the ring 70 has in the region of the system of the bottom 52 of the plunger 50 has a flattening 72, wherein the bottom 52 of the plunger 50 is also formed at least approximately flat, so that a flat contact between the bottom 52 and ring 70 results. It can be provided that in the cross section according to FIG. 2 considered the longitudinal axis 23 of the pump piston 20 relative to the axis of rotation 15 of the drive shaft 14 in the direction of rotation 74 of the drive shaft 14 is offset by a distance 76, so that the longitudinal axis 23 does not intersect the axis of rotation 15.
  • the disc 60 When assembling the pump can outside the housing 12, the disc 60 is mounted on the pump piston 20, in particular pressed onto this, then the pump piston 20 are used with the disc 60 in the plunger 50 and the fuse element 64 are inserted.
  • the spring 58 On the composite of pump piston 20 and plunger 50, the spring 58 can then be placed and this unit can then be installed on the housing part 24 be introduced by the pump piston 20 into the cylinder bore 22 and the shell 54 of the plunger 50 is pushed onto the portion 44. The housing part 24 with pump piston 20 and plunger 50 can then be inserted into the housing 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)

Claims (7)

  1. Pompe, en particulier pompe à carburant haute pression, comprenant au moins un élément de pompe (18) qui présente un piston de pompe (20) qui est entraîné au moins de manière indirecte par un arbre d'entraînement (14) en un mouvement de levée, le piston de pompe (20) étant guidé dans un alésage de cylindre (22) d'une partie de boîtier (24) de la pompe, la partie de boîtier (24) présentant une portion cylindrique (44) entourant l'alésage de cylindre (22), entre le piston de pompe (20) et l'arbre d'entraînement (14) étant disposé un poussoir (50) en forme de coupelle (50), qui présente un fond (52) tourné vers l'arbre d'entraînement (14) et une enveloppe (54) se raccordant à ce fond, l'enveloppe (54) du poussoir (50) étant guidée de manière déplaçable sur la portion cylindrique (44) de la partie de boîtier (24), un ressort (58) étant prévu, lequel sollicite le poussoir (50) vers l'arbre d'entraînement (14), et le piston de pompe (20) s'appliquant avec son côté frontal (21) tourné vers l'arbre d'entraînement (14) contre le fond (52) du poussoir (50), un disque (60) étant fixé sur le piston de pompe (20) dans sa région d'extrémité tournée vers le fond (52) du poussoir (50), lequel disque présente un plus grand diamètre extérieur que le piston de pompe (20), et le piston de pompe (20) étant fixé dans la direction de l'axe longitudinal (23) du piston de pompe (20) avec le disque (60) dans le poussoir (50) au moyen d'un élément de fixation (64) venant en prise sur le disque (60), caractérisée en ce que l'élément de fixation (64) est une bague élastique, qui est encliquetée radialement vers l'extérieur dans une rainure annulaire (62) dans la périphérie interne de l'enveloppe (54) du poussoir (50) et qui vient en prise par le dessus radialement vers l'intérieur avec le disque (60) sur son côté opposé au fond (52) du poussoir (50).
  2. Pompe selon la revendication 1, caractérisée en ce que le piston de pompe (20) fait saillie avec son côté frontal (21) s'appliquant contre le fond (52) du poussoir (50) dans la direction de son axe longitudinal (23) au-delà du disque (60).
  3. Pompe selon la revendication 1 ou 2, caractérisée en ce que le piston de pompe (20) est déplaçable avec le disque (60) dans le poussoir (50) dans une mesure limitée perpendiculaire à son axe longitudinal (23).
  4. Pompe selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le piston de pompe (20) présente sur toute sa longueur un diamètre au moins essentiellement constant.
  5. Pompe selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le disque (60) est pressé sur le piston de pompe (20).
  6. Pompe selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le disque (60) présente, dans sa région entre le piston de pompe (20) et l'enveloppe (54) du poussoir (50), au moins une ouverture (67).
  7. Pompe selon l'une quelconque des revendications 1 à 6, caractérisée en ce que l'enveloppe (54) du poussoir (50) présente, dans la région du disque (60), un plus petit diamètre intérieur et une plus grande épaisseur de paroi que dans sa région guidée sur la portion cylindrique (44) de la partie de boîtier (24).
EP09726240A 2008-03-26 2009-02-02 Pompe, en particulier pompe à carburant haute pression Active EP2271838B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008000824A DE102008000824A1 (de) 2008-03-26 2008-03-26 Pumpe, insbesondere Kraftstoffhochdruckpumpe
PCT/EP2009/051112 WO2009118212A1 (fr) 2008-03-26 2009-02-02 Pompe, en particulier pompe à carburant haute pression

Publications (2)

Publication Number Publication Date
EP2271838A1 EP2271838A1 (fr) 2011-01-12
EP2271838B1 true EP2271838B1 (fr) 2011-06-08

Family

ID=40695154

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09726240A Active EP2271838B1 (fr) 2008-03-26 2009-02-02 Pompe, en particulier pompe à carburant haute pression

Country Status (7)

Country Link
US (1) US20110023704A1 (fr)
EP (1) EP2271838B1 (fr)
JP (1) JP5323173B2 (fr)
CN (1) CN101981316B (fr)
AT (1) ATE512299T1 (fr)
DE (1) DE102008000824A1 (fr)
WO (1) WO2009118212A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007038525A1 (de) * 2007-08-16 2009-02-19 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffhochdruckpumpe
JP5372692B2 (ja) * 2009-10-06 2013-12-18 日立オートモティブシステムズ株式会社 高圧燃料ポンプ
DE102010011435A1 (de) * 2010-03-15 2011-09-15 Schaeffler Technologies Gmbh & Co. Kg Baueinheit mit einem Pumpenkolben und einem Stößel
IT1402008B1 (it) * 2010-10-07 2013-08-28 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna
KR101204635B1 (ko) 2011-09-21 2012-11-23 현대중공업 주식회사 엄브렐러 플런저가이드가 구비된 연료 분사펌프
EP2660459B1 (fr) * 2012-05-03 2016-04-06 Delphi International Operations Luxembourg S.à r.l. Réduction de charge
US20150136051A1 (en) * 2013-11-15 2015-05-21 Delphi Technologies, Inc. Camshaft and follower geometry
GB2570290B (en) * 2018-01-09 2020-04-29 Delphi Tech Ip Ltd Fuel pump

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JP2722766B2 (ja) * 1990-04-12 1998-03-09 株式会社デンソー 燃料噴射ポンプ
DE19522306B4 (de) * 1994-06-24 2004-08-26 Denso Corp., Kariya Hochdruck-Kraftstoffzuführungspumpe
US5775203A (en) * 1997-01-28 1998-07-07 Cummins Engine Company, Inc. High pressure fuel pump assembly
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DE10039210A1 (de) * 2000-08-10 2002-02-28 Siemens Ag Radialkolbenpumpe mit zweiteiligem Federträger
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EP1296061A3 (fr) * 2001-09-21 2005-03-16 Hitachi, Ltd. Pompe à carburant à haute pression
DE10147981A1 (de) * 2001-09-28 2003-04-24 Siemens Ag Verbindungselement zur Verbindung eines Kolbens mit einem Rückstellelement
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JP2010037997A (ja) * 2008-08-01 2010-02-18 Denso Corp 燃料供給ポンプ

Also Published As

Publication number Publication date
DE102008000824A1 (de) 2009-10-01
WO2009118212A1 (fr) 2009-10-01
US20110023704A1 (en) 2011-02-03
JP5323173B2 (ja) 2013-10-23
CN101981316B (zh) 2013-07-24
JP2011518271A (ja) 2011-06-23
CN101981316A (zh) 2011-02-23
EP2271838A1 (fr) 2011-01-12
ATE512299T1 (de) 2011-06-15

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