EP1314882B1 - Pompe à haute pression - Google Patents

Pompe à haute pression Download PDF

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Publication number
EP1314882B1
EP1314882B1 EP02020978A EP02020978A EP1314882B1 EP 1314882 B1 EP1314882 B1 EP 1314882B1 EP 02020978 A EP02020978 A EP 02020978A EP 02020978 A EP02020978 A EP 02020978A EP 1314882 B1 EP1314882 B1 EP 1314882B1
Authority
EP
European Patent Office
Prior art keywords
piston
pressure pump
driveshaft
section
recess
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 - Fee Related
Application number
EP02020978A
Other languages
German (de)
English (en)
Other versions
EP1314882A1 (fr
Inventor
Gerd Blessing
Franz Huber
Günter Kellermann
Walter Modrich
Bernd Wiemann
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.)
Mercedes Benz Group AG
Original Assignee
Daimler AG
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 Daimler AG filed Critical Daimler AG
Publication of EP1314882A1 publication Critical patent/EP1314882A1/fr
Application granted granted Critical
Publication of EP1314882B1 publication Critical patent/EP1314882B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F02M59/02—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
    • F02M59/04—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • F04B1/0408—Pistons
    • 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

Definitions

  • the invention relates to a high-pressure pump for fuel supply of fuel injection systems for internal combustion engines, in particular of common rail injection systems, according to the closer defined in the preamble of claim 1.
  • a pump element for a piston pump for fuel high pressure generation in fuel injection systems of internal combustion engines in which a bearing surface of a piston and a recess of a piston attached to the plate form a substantially flat contact zone. This can prevent the plate from performing a tilting movement.
  • a generic high-pressure pump is from the WO 99/37916 A1 or the US 6,077,056 known. Further high-pressure pumps are from the MTZ 58 (1997) p. 572 or the DE 197 56 087 A1 known.
  • the principal mode of action of these high-pressure pumps is very well suited to operating according to the common rail principle internal combustion engines, but the special construction does not guarantee a perfect function in all operating conditions, so that it may well damage the high-pressure pump and possibly even damage the internal combustion engine can come.
  • high-pressure pump 1 The basic structure of in Fig. 1 shown high-pressure pump 1 is from the DE 197 56 087 A1 known, which is why in the following only briefly on the principle of operation of the same is discussed. In addition, not all components required for the function of the high pressure pump 1 are shown. This is also on the DE 197 56 087 A1 directed.
  • the high-pressure pump 1 has a drive shaft 2, which is provided for driving in the present case three mutually offset by 120 ° piston 3. Since the high-pressure pump 1 is designed to be symmetrical, the following also applies to the other two pistons 3 for one of the three pistons 3. In this connection, it is of course possible to have a larger or a smaller number of pistons 3 on the circumference of the drive shaft 2 to install.
  • the pistons 3 are provided for the compression of fuel, which is then supplied to a high-pressure accumulator, not shown.
  • the high pressure pump 1 is used for fuel supply of a fuel injection system, not shown, for a likewise not shown internal combustion engine, in particular for a common rail injection system, which also in the DE 197 56 087 A1 is described.
  • the drive shaft 2 can be driven for example by a crank mechanism of the internal combustion engine.
  • a connection of the drive shaft 2 directly with a camshaft of the internal combustion engine or a completely separate drive the same is conceivable.
  • the drive shaft 2 In the region in which the drive shaft 2 is in operative connection with the piston 3, it is eccentric, ie it has an eccentric shaft portion 2a.
  • the shaft portion 2a is provided at its periphery with a so-called polygon ring 4, which in the present case has three flats 5 which are in direct contact with the piston 3.
  • the polygon ring 4 has a number of flats 5 corresponding to the number of pistons 3.
  • the polygon ring 4 is rotatable relative to the drive shaft 2 and brings in this way a force acting in the radial direction of the piston 3, whereby they perform an oscillating movement successively.
  • piston plates 6 are arranged between the piston 3 and the drive shaft 2 and the polygon ring 4, respectively, which have a recess 7 in which a first portion 8 of the piston 3 is mounted.
  • the piston plates 6 guide the polygon ring 4 during its movement.
  • Each piston 3 is further associated with a spring element 9, which serves to return the respective piston 3.
  • the piston 3 has, in addition to the section 8 connected to the polygon ring 4, further piston sections 10, 11 and 12.
  • the high-pressure pump 1 then works optimally when each piston 3 is exactly perpendicular to the associated piston plate 6 and is not tilted. Due to the free mobility of the polygon ring 4 in operation, however, such tilting may well occur and can not always be prevented, as it is Fig. 2 shows. For this reason, the portion 8 of the piston 3 mounted in the recess 7 and thus also the recess 7 itself have a larger diameter than the subsequent portion 10 of the piston 3.
  • the diameter of the section 8 depends on the loads to which the high-pressure pump 1 is exposed. Furthermore, created by this enlarged diameter of the section 8, a circumferential projection 13 on which a bracket 14 is supported, which serves as an assembly aid for the Piston plate 6 serves with the piston 3 and in Fig. 1 not shown.
  • the recess 7 facing portion 8 of the piston 3 is provided with a radius 15, which is generally 10 to 50 times the diameter of the section 8. In this way it is achieved that in a possible tilting of the piston 3 relative to the polygon ring 4, the piston 3 returns faster to its normal position, since the restoring force is greater.
  • the radius should be less than 45 times the diameter of section 8 to achieve this effect.
  • the radius 15 is shown greatly enlarged.
  • the diameter of the piston 3 is in a range between 8 - 10 mm and the radius 15 is about 200 mm, so that the radius 15 is approximately 20 to 25 times the diameter of the piston 3, which the practice is very well suited.
  • the radius 15 is also larger.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (4)

  1. Pompe à haute pression (1) pour l'alimentation en carburant de systèmes d'injection de carburant pour moteurs à combustion interne, en particulier de systèmes d'injection dits "Common Rail", comprenant un arbre d'entraînement (2) et au moins deux pistons (3) déplaçables par l'arbre d'entraînement (2) pour comprimer le carburant, dans laquelle entre l'arbre d'entraînement (2) et lesdits au moins deux pistons (3) est agencée une plaque à piston respective (6) qui présente une échancrure (7) dans laquelle une portion (8) du piston (3) est montée avec possibilité de basculement, ladite échancrure (7) et la portion (8) du piston (3) tournée vers l'échancrure (7) présentent une section plus grande qu'une portion successive (10) du piston (3) détournée de la plaque à piston (6), et la portion (8) du piston (3) tournée vers l'échancrure (7) présente un sur son côté tourné vers la plaque à piston (6) un rayon (15),
    caractérisée en ce que le rayon (15) est de 10 à 50 fois le diamètre de la portion (8).
  2. Pompe à haute pression selon la revendication 1,
    caractérisée en ce que le diamètre du piston (3) est entre 8 et 10 mm.
  3. Pompe à haute pression selon la revendication 1 ou 2,
    caractérisée en ce que, dans la région dans laquelle il coopère avec le piston (3), l'arbre d'entraînement (2) est réalisé excentrique.
  4. Pompe à haute pression selon la revendication 1, 2 ou 3,
    caractérisée en ce que, dans la région dans laquelle il coopère avec le piston (3), l'arbre d'entraînement (2) est pourvu d'une bague (4) qui présente un nombre de méplats (5) correspondant au nombre de pistons (3).
EP02020978A 2001-11-22 2002-09-20 Pompe à haute pression Expired - Fee Related EP1314882B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001157375 DE10157375A1 (de) 2001-11-22 2001-11-22 Hochdruckpumpe
DE10157375 2001-11-22

Publications (2)

Publication Number Publication Date
EP1314882A1 EP1314882A1 (fr) 2003-05-28
EP1314882B1 true EP1314882B1 (fr) 2008-04-23

Family

ID=7706632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02020978A Expired - Fee Related EP1314882B1 (fr) 2001-11-22 2002-09-20 Pompe à haute pression

Country Status (2)

Country Link
EP (1) EP1314882B1 (fr)
DE (2) DE10157375A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003042534A2 (fr) * 2001-10-15 2003-05-22 Robert Bosch Gmbh Element pompe et pompe a piston permettant la generation d'une haute pression de carburant

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19705205A1 (de) * 1997-02-12 1998-08-13 Bosch Gmbh Robert Kolbenpumpe
DE19756087A1 (de) 1997-12-17 1999-06-24 Bosch Gmbh Robert Hochdruckpumpe zur Kraftstoffversorgung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen
DE19802475A1 (de) * 1998-01-23 1999-07-29 Bosch Gmbh Robert Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung
DE19809315A1 (de) * 1998-03-05 1999-09-09 Bosch Gmbh Robert Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung
DE19943160A1 (de) * 1998-09-10 2000-03-16 Denso Corp Kraftstoffeinspritzpumpe
JP4016237B2 (ja) * 1999-04-16 2007-12-05 株式会社デンソー 燃料噴射ポンプ
DE10044997A1 (de) * 2000-09-11 2002-03-21 Schaeffler Waelzlager Ohg Druckplatte einer Radialkolbenpumpe

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003042534A2 (fr) * 2001-10-15 2003-05-22 Robert Bosch Gmbh Element pompe et pompe a piston permettant la generation d'une haute pression de carburant

Also Published As

Publication number Publication date
DE50212139D1 (de) 2008-06-05
DE10157375A1 (de) 2003-06-05
EP1314882A1 (fr) 2003-05-28

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