EP2079923B1 - Pompe à piston, notamment pompe de carburant haute pression, avec poussoir à galet - Google Patents

Pompe à piston, notamment pompe de carburant haute pression, avec poussoir à galet Download PDF

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Publication number
EP2079923B1
EP2079923B1 EP07802934A EP07802934A EP2079923B1 EP 2079923 B1 EP2079923 B1 EP 2079923B1 EP 07802934 A EP07802934 A EP 07802934A EP 07802934 A EP07802934 A EP 07802934A EP 2079923 B1 EP2079923 B1 EP 2079923B1
Authority
EP
European Patent Office
Prior art keywords
cam portion
roller
collar
piston pump
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.)
Not-in-force
Application number
EP07802934A
Other languages
German (de)
English (en)
Other versions
EP2079923A1 (fr
Inventor
Gerhard Meier
Jochen Aleker
Arnold Gente
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
Priority to PL07802934T priority Critical patent/PL2079923T3/pl
Publication of EP2079923A1 publication Critical patent/EP2079923A1/fr
Application granted granted Critical
Publication of EP2079923B1 publication Critical patent/EP2079923B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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 piston pump, in particular a high-pressure fuel pump, according to the preamble of claim 1.
  • Such a piston pump is through the WO 2004/097219 A known.
  • This piston pump has a housing, a piston and a drive shaft.
  • the drive shaft has a cam portion, on which the piston is supported indirectly via a roller rotatably mounted in a roller tappet.
  • the drive shaft has a cam portion for the piston and laterally of the cam portion, a collar is provided on both sides of the drive shaft, which extends in the radial direction beyond the cam portion.
  • the two frets form contact surfaces for the roller, where it comes to rest on axial displacement. Which area of the roller comes into contact with the frets is not specified here.
  • a roller drive for a fuel injection pump in which a roller is rotatably mounted in a rocker arm via a bearing shell, which rolls on a cam of a camshaft of an internal combustion engine.
  • the bearing shell has lateral contact surfaces on which the roller comes into contact with axial displacement.
  • the roller has at its end faces centrally arranged recesses, through which an elastic deformation is to be made possible in the edge region of the roller.
  • the bearing shell with the contact surfaces is fixed in the rocker arm and rotates neither with the roller nor with the camshaft.
  • the contact force with which the roller is pressed onto the cam portion of the drive shaft is greatly different due to the hydraulic forces in the delivery chamber of the piston and the inertial forces of the piston during a revolution of the drive shaft and also depends largely on the speed of the drive shaft and the delivery rate and delivery pressure the piston pump. In some operating points of the piston pump, it may therefore happen that the roller does not rotate, but slides on the cam portion of the drive shaft. This Operating state is undesirable because it can lead to damage of the cam portion and / or the roller and / or the roller tappet. It is thus necessary that the roller always rotates and rolls on the cam portion and does not slide on the cam portion.
  • the piston pump according to the invention with the features according to claim 1 has the advantage that the rotational movement of the roller is supported by the rotational movement of the drive shaft at contact with the frets and by the contact of the roller only in the region of its outer diameter with the collars of the drive shaft a high , whose rotational movement results in supporting torque on the roller.
  • camshaft and collar or cam portion and collar are integrally formed.
  • the collar is made together with the cam portion, for example, by grinding from a blank of a drive shaft.
  • the collar for example, as a sheet metal blank and firmly connected to the drive shaft or with its cam portion. It is possible to press the collar with the camshaft and / or connect by a weld.
  • a piston pump carries in FIG. 1 Overall, the reference numeral 10. It comprises a housing 12 in which a drive shaft 14 via two bearings 16 and 18 is mounted. As in particular from FIG. 2 As can be seen, the drive shaft 14 between the two bearings 16 and 18 comprises a cross-sectionally oval cam portion 20th
  • piston pump 10 serves as a high-pressure fuel pump for an internal combustion engine in a motor vehicle. With it, the fuel is compressed to a very high pressure and conveyed to a fuel manifold (not shown).
  • the drive shaft 14 of the piston pump 10 is thereby directly from the internal combustion engine driven. Therefore, the drive shaft 14 has a corresponding coupling portion 22 which is disposed outside of the housing 12.
  • the piston pump 10 is a 1-cylinder radial piston pump. For reasons of clarity, however, neither the piston nor the delivery chamber bounded by it nor the associated intake and exhaust valves are shown in the two figures. These elements are integrated into a cylinder head, not shown, which can be attached to a cylinder section 24 of the housing 12 that is perpendicular to the longitudinal axis of the drive shaft 14.
  • the piston of the piston pump 10 is indirectly driven by the cam portion 20 of the drive shaft 14.
  • the term "indirectly” is understood here to mean that the piston does not directly touch the cam section 20, but that a so-called roller tappet 26 is arranged between the piston and the cam section 20. This comprises a plunger body 28 and a roller 30th
  • the roller tappet 26 is pressed together with the piston against the cam portion 20 to ensure that the roller 26 does not lift off from the cam portion 20 of the drive shaft 14.
  • the plunger body 28 is a sintered part. Alternatively, it could also be an aluminum pressed part or a metal skeleton, which is encapsulated in plastic.
  • the plunger body 28 comprises a central, cuboid roller shoe or plunger block 34, on whose in FIG. 3 Upper region on both sides in each case an outwardly extending projection 36 and 38 is integrally formed.
  • a vertically upwardly extending guide portion 40 or 42 is integrally formed on this.
  • the two guide portions 40 and 42 engage in the mounting position in corresponding grooves 44 and 46 in the cylinder portion 24 of the housing 12 (see FIG. 1 ), which form the housing-side management areas. In this way, the plunger body 28 can not rotate about a longitudinal axis of the cylinder portion 24.
  • a cylindrical recess 48 is inserted into the plunger block 34, the longitudinal axis of which in the installed position is parallel to the longitudinal axis of the Drive shaft 14 extends.
  • the recess is open to the cam portion 20 and extends over the entire width of the plunger body 28. Their maximum depth is approximately equal to the radius of the cylindrical roller 30 so that it protrudes approximately half a diameter beyond the edge of the recess 48.
  • Plunger body 28 and plunger block 34 may be formed integrally or as separate components.
  • roller 30 is inserted into the recess 48 and is supported with its lateral surface 49 on the wall of the recess 48 from. Roller 30 and recess 48 form a plain bearing.
  • the securing element 32 serves to secure the roller 30 in the recess 48 in the tappet body 28 and, in particular, to prevent the roller 30 from falling out of the tappet element 28 during assembly.
  • FIG. 1 on both sides of the cam portion 20 each have a collar 50 is provided on the drive shaft 14.
  • the collar 50 extends radially beyond the cam portion 20 so that the roller 30, when traveling in the axial direction during operation, starts against one of the two collars 50. Thereby, the axial movement of the roller 30 is limited during operation to a defined extent.
  • care can be taken that by a suitable tribological pairing of the roller 30 and the collars 50, the wear on both the roller 30 and the collar 50 is so small that it does not lead to malfunction or a shortening of the life of the piston pump 10 , This can for example be achieved in that the collar as well as the cam portion 20 and the roller tappet 26 are made of hardened steel.
  • an undercut 52 is provided in each case, which ensures that the notch effect at the transition between cam portion 20 and collar 50 is reduced. Furthermore, the undercuts 52 provide for defined contact surfaces between roller 30 and cam portion 20 on the one hand and roller tappet 26 and the collars 50 on the other.
  • roller 30 is rotated by the friction that arises when starting at one of the collars 50, if it does not already by the rolling friction between the cam portion 20 and roller 30 rotates. It has been found in practical experiments that the rolling friction between roller 30 and cam portion 20 is not always sufficient to enable the rollers 30 in rotation, so that not always between the recess 48 in the plunger block 34 and the roller 30 as desired, a hydrodynamic Plain bearing forms. This undesirable effect is avoided in the embodiment of the drive shaft 14 according to the invention.
  • FIG. 1 an embodiment of a roller tappet 26 according to the invention is shown.
  • the roller 30 at the end faces (without reference numeral) of the roller 30 each have a centrally disposed recess 54 recessed. This ensures that the roller 30 comes into contact with the collar 50 of the drive shaft 14 only in the region of its outer diameter, so that the torque exerted on the roller 30 by the adhesive or sliding friction between roller 30 and collar 50 is maximum due to the large lever arm becomes
  • FIG. 3 a constructive detail of a further advantageous embodiment of a piston pump according to the invention is shown in detail.
  • the collar 50 In the embodiment according to the FIGS. 1 and 2 are the collar 50, the cam portion 20 and the drive shaft 14 integrally formed.
  • the federal government in the embodiment according to FIG. 3 the federal government as a separate component.
  • the collar 50 can be formed for example as a sheet metal blank.
  • a shoulder 56 is machined laterally of the undercut 52.
  • the collar 50 is permanently attached, for example by pressing. It is also possible, alternatively or in addition to the press connection, to fasten the collar 50 to the shoulder 56 by means of a weld 58.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)

Claims (6)

  1. Pompe à piston, notamment pompe à carburant haute pression, comprenant un boîtier (12), un piston et un arbre d'entraînement (14) avec une portion de came (20) sur laquelle s'appuie le piston au moins de manière indirecte par le biais d'un galet de roulement (30) monté à rotation dans un poussoir à galet (28), un épaulement (50) étant prévu latéralement à la portion de came (20) à chaque fois des deux côtés, lequel fait saillie dans la direction radiale au-delà de la portion de came (20), caractérisée en ce que le galet de roulement (30) présente sur ses côtés frontaux un renfoncement disposé centralement (54), et en ce que le galet de roulement (30) ne parvient en contact avec l'épaulement (50) de l'arbre d'entraînement (14) que dans la région de son diamètre extérieur.
  2. Pompe à piston selon la revendication 1, caractérisée en ce que l'au moins un épaulement (50) et la portion de came (20) sont réalisés d'une seule pièce.
  3. Pompe à piston selon la revendication 1, caractérisée en ce que l'au moins un épaulement (50) est réalisé sous forme de pièce découpée en tôle et est connecté fixement à l'arbre d'entraînement (14) ou à sa portion de came (20).
  4. Pompe à piston selon la revendication 3, caractérisée en ce que l'au moins un épaulement (50) est pressé avec l'arbre d'entraînement (14) ou sa portion de came (20) et/ou est connecté par un cordon de soudure (58).
  5. Pompe à piston selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un dégagement par rainure (52) est réalisé entre l'au moins un épaulement (50) et la portion de came (20).
  6. Pompe à piston selon l'une quelconque des revendications précédentes, caractérisée en ce que l'au moins un épaulement (50) est trempé.
EP07802934A 2006-10-16 2007-08-28 Pompe à piston, notamment pompe de carburant haute pression, avec poussoir à galet Not-in-force EP2079923B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07802934T PL2079923T3 (pl) 2006-10-16 2007-08-28 Pompa tłokowa, w szczególności wysokociśnieniowa pompa paliwowa z popychaczem rolkowym

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006048722A DE102006048722A1 (de) 2006-10-16 2006-10-16 Kolbenpumpe, insbesondere Kraftstoffhochdruckpumpe, mit Rollenstößel
PCT/EP2007/058897 WO2008046683A1 (fr) 2006-10-16 2007-08-28 Pompe à piston, notamment pompe de carburant haute pression, avec poussoir à galet

Publications (2)

Publication Number Publication Date
EP2079923A1 EP2079923A1 (fr) 2009-07-22
EP2079923B1 true EP2079923B1 (fr) 2010-05-12

Family

ID=38872090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07802934A Not-in-force EP2079923B1 (fr) 2006-10-16 2007-08-28 Pompe à piston, notamment pompe de carburant haute pression, avec poussoir à galet

Country Status (6)

Country Link
EP (1) EP2079923B1 (fr)
CN (1) CN101529082B (fr)
AT (1) ATE467760T1 (fr)
DE (2) DE102006048722A1 (fr)
PL (1) PL2079923T3 (fr)
WO (1) WO2008046683A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010039967A1 (de) 2010-08-31 2012-03-01 Robert Bosch Gmbh Hochdruckpumpe
DE102012203428A1 (de) 2012-03-05 2013-09-05 Robert Bosch Gmbh Kolbenpumpe
CN107110093A (zh) * 2014-12-17 2017-08-29 德尔福国际业务卢森堡公司 传动轴

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001871A1 (de) * 2008-05-20 2009-11-26 Robert Bosch Gmbh Kraftstoffhochdruckpumpe
DE102008040081A1 (de) * 2008-07-02 2010-01-07 Robert Bosch Gmbh Hochdruckpumpe
DE102009000859A1 (de) 2009-02-13 2010-08-19 Robert Bosch Gmbh Kraftstoffhochdruckpumpe
DE102009001315A1 (de) 2009-03-04 2010-09-09 Robert Bosch Gmbh Kolbenpumpe
DE102009003097B4 (de) * 2009-05-14 2018-02-08 Robert Bosch Gmbh Hochdruckpumpe, insbesondere Radialkolbenpumpe, mit zumindest einem Stößelkörper, einem verdrehbaren Rollenschuh, einer Laufrolle und einer axialen Anlagestelle für die Laufrolle, die beabstandet zur Drehachse der Laufrolle angeordnet ist
DE102009028392B4 (de) 2009-08-10 2018-05-24 Robert Bosch Gmbh Hochdruckpumpe
DE102009028394A1 (de) * 2009-08-10 2011-02-17 Robert Bosch Gmbh Hochdruckpumpe
DE102010043510A1 (de) * 2010-11-05 2012-05-10 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffhochdruckpumpe
DE102010063328A1 (de) * 2010-12-17 2012-06-21 Robert Bosch Gmbh Hochdruckpumpe
DE102010063363A1 (de) * 2010-12-17 2012-06-21 Robert Bosch Gmbh Hochdruckpumpe
DE102011075691A1 (de) * 2011-05-12 2012-11-15 Robert Bosch Gmbh Pumpe, insbesondere Hochdruckpumpe eines Kraftstoffeinspritzsystems
DE102011076022A1 (de) * 2011-05-18 2012-11-22 Robert Bosch Gmbh Rollenstößel, insbesondere einer Kolbenpumpe
DE112014006325T5 (de) 2014-02-03 2017-03-23 Cummins Inc. Nockenwellendrucksteuerung gesichert durch Antriebszahnrad

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4300631A1 (de) * 1993-01-13 1994-07-14 Bosch Gmbh Robert Kraftstoffeinspritzpumpe für Brennkraftmaschinen
DE19641791B4 (de) * 1995-10-24 2005-06-02 Volkswagen Ag Rollenantrieb, insbesondere für Brennstoffeinspritzpumpen
DE19712872A1 (de) * 1997-03-27 1998-10-01 Bosch Gmbh Robert Pumpe, insbesonder Hochdruckpumpe für eine Kraftstoffeinspritzvorrichtung eines Verbrennungsmotors
EP1454055B1 (fr) * 2001-12-01 2005-11-02 Robert Bosch Gmbh Pompe a piston radiaux a graissage force
GB0309699D0 (en) * 2003-04-28 2003-06-04 Delphi Tech Inc Improvements in cams and cam followers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010039967A1 (de) 2010-08-31 2012-03-01 Robert Bosch Gmbh Hochdruckpumpe
DE102012203428A1 (de) 2012-03-05 2013-09-05 Robert Bosch Gmbh Kolbenpumpe
WO2013131662A1 (fr) 2012-03-05 2013-09-12 Robert Bosch Gmbh Pompe à piston
CN107110093A (zh) * 2014-12-17 2017-08-29 德尔福国际业务卢森堡公司 传动轴

Also Published As

Publication number Publication date
WO2008046683A1 (fr) 2008-04-24
DE102006048722A1 (de) 2008-04-17
EP2079923A1 (fr) 2009-07-22
CN101529082A (zh) 2009-09-09
ATE467760T1 (de) 2010-05-15
PL2079923T3 (pl) 2010-10-29
CN101529082B (zh) 2012-01-11
DE502007003793D1 (de) 2010-06-24

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