EP2964954A1 - Pompe haute pression pour système d'injection de carburant - Google Patents

Pompe haute pression pour système d'injection de carburant

Info

Publication number
EP2964954A1
EP2964954A1 EP14702011.9A EP14702011A EP2964954A1 EP 2964954 A1 EP2964954 A1 EP 2964954A1 EP 14702011 A EP14702011 A EP 14702011A EP 2964954 A1 EP2964954 A1 EP 2964954A1
Authority
EP
European Patent Office
Prior art keywords
pump
cam
drive shaft
pressure pump
offset
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.)
Granted
Application number
EP14702011.9A
Other languages
German (de)
English (en)
Other versions
EP2964954B1 (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
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
Publication of EP2964954A1 publication Critical patent/EP2964954A1/fr
Application granted granted Critical
Publication of EP2964954B1 publication Critical patent/EP2964954B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F04B1/0413—Cams
    • F04B1/0417—Cams consisting of two or more cylindrical elements, e.g. rollers
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams

Definitions

  • the invention relates to a high-pressure pump for a fuel injection system, in particular a common-rail injection system, having the features of the preamble of claim 1.
  • a high pressure pump of the aforementioned type is shown by way of example from the published patent application DE 10 2009 026 735 A1. It has three pump elements arranged around a drive shaft in a radial plane, the pump pistons of which are drivable in a reciprocating motion via a double cam connected to the drive shaft. Compared to a 2-piston pump, the proposed arrangement to eliminate the problem of quantity limitation.
  • the double cam has for this purpose two projections, which are arranged offset at an angle of 180 ° to each other.
  • two of the three pump elements are mirror-symmetrical, each arranged at an angular distance of 30 ° to the longitudinal axis of the double cam.
  • the angular distance of the third pump element with respect to the longitudinal axis of the double cam is 90 °.
  • each pump piston is over one
  • the present invention has for its object to provide a high-pressure pump of the aforementioned type, whose life is significantly increased.
  • the proposed high-pressure pump for a fuel injection system in particular a common rail injection system, comprises a pump housing in which at least two pump elements arranged radially around a drive shaft are accommodated.
  • each pump element has a pump piston which is indirectly supported via a plunger assembly on a cam of the drive shaft, so that the pump piston can be driven by a rotation of the drive shaft to a lifting movement.
  • the invention include
  • Plunger assemblies Rolls which lie axially relative to a longitudinal axis A of the drive shaft and with respect to their angular positions offset from one another on an outer peripheral surface of the cam. Due to the axial offset of the rollers, these do not run in succession but axially offset, preferably side by side, on the outer peripheral surface of the cam. The stress on the cam outer peripheral surface to friction and the associated wear can be significantly reduced in this way. For example, the stress and thus the wear in a high pressure pump with two pump elements whose pump piston via one
  • Plunger assembly are supported on the cam, halved when the rollers run side by side instead of one behind the other on the outer peripheral surface of the cam. This means that the running surfaces of the two rollers must not overlap. If this condition is met, the service life of the high pressure pump can be extended twice.
  • the cam be widened in accordance with the axial offset of the rollers. This may need to be considered when designing the pump housing of the high-pressure pump.
  • pump piston and plunger assemblies are generally coaxial with respect to a longitudinal axis of the pump element arranged to effect optimum power transmission. Therefore, in the present case of the axial offset or angular spacing of the rollers to each other is mentioned, this applies accordingly to the axial offset or angular distance of the pump piston or the pump elements to each other.
  • the axial offset of the rollers relative to one another in each case at least one roller width. In this way it is ensured that the running surfaces of the rollers do not overlap, but next to each other, possibly come to lie at a distance to each other.
  • the outer peripheral surface of the cam preferably has a width equal to the sum of the widths of the rollers or greater than the sum of the widths of the rollers.
  • the rollers of the plurality of ram assemblies are also offset with respect to their angular positions.
  • the angular offset ⁇ can be 60 °, 90 ° or 120 °.
  • the optimum angular offset depends, inter alia, on the specific design of the cam and / or the number of pump elements and thus the pump piston to be supported on the cam.
  • the angular offset makes it possible to drive the pump pistons of the plurality of pump elements in a lifting movement such that they each reach their top dead center with a time offset.
  • the cam may be formed as a double cam having two offset by 180 ° to each other arranged projections.
  • a double cam cam preferably two pump pistons are supported via a respective plunger assembly whose roles offset by 90 ° and lie in different radial planes.
  • the two pump elements of the double cam causes an opposite movement of the pump piston of the two pump elements. This means that one pump piston performs a delivery stroke and the other pump piston performs a suction stroke. With only one cam can be increased in this way the delivery of the high-pressure pump.
  • the cam In order to drive with a cam, in particular double cams, a plurality of axially offset from each other or arranged in different radial planes pump elements, the cam is preferably made wider.
  • the cam can also be designed in several parts, in particular in two parts. The several parts of the cam are then axially offset from each other, in particular next to each other, but arranged in the same angular position on the drive shaft.
  • At least two pump elements are accommodated in the pump housing, which are arranged in different radial planes and in an offset angular position.
  • Such a high pressure pump is particularly suitable for use in common rail injection systems.
  • FIG. 1 shows a longitudinal section through a preferred embodiment of a high-pressure pump according to the invention
  • FIG. 2 shows a cross section through the high pressure pump of FIG. 1.
  • the high-pressure pump according to the invention shown in Figure 1 has a multi-part pump housing 1, in which two pump elements 3, 3 'are received, with respect to a longitudinal axis A of a drive shaft 2 in different radial planes, d. H. axially offset from one another, and are arranged in different angular positions.
  • the axial offset is a roller width b or b ', so that the rollers 7, 7' of the plunger assemblies 5, 5 'come to lie next to one another.
  • the two pump elements 3, 3 'offset by an angle ⁇ 90 ° to each other (see Figure 2).
  • Each pump element 3, 3 ' has a pump piston 4, 4', which is supported on an outer peripheral surface 8 of a cam 6 via a plunger assembly 5, 5 'or a roller 7, 7' of the respective plunger assembly 5, 5 '.
  • the pump pistons 4, 4 ' are thus driven in a stroke movement.
  • the cam 6 is formed as a 180 ° double cam (see Figure 2) and comprises two parts which are firmly connected.
  • a cam instead of a multi-part cam 6, a cam may be used which has a greater width a.
  • the width a of the illustrated two-part cam 6 in the present case corresponds to the sum of the widths b, b 'of the rollers 7, 7' (see FIG. 1).
  • Plunger assemblies 5, 5 ' have no overlapping running surfaces, the stress and thus the wear of the outer peripheral surface 8 of the cam 6 compared to a conventional two-piston pump with two arranged in a radial plane pump elements is reduced to half.
  • the long service life of the high-pressure pump according to the invention promises long running times, so that it is suitable not only for use in passenger cars, but also for use in commercial vehicles and trucks.

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)

Abstract

L'invention concerne une pompe haute pression pour un système d'injection de carburant, en particulier un système d'injection à rampe commune. Cette pompe comprend un carter (1) dans lequel sont logés au moins deux éléments de pompe (3, 3') disposés radialement autour d'un arbre d'entraînement (2). Chaque élément de pompe (3, 3') possède un piston de pompe (4, 4'), lequel est directement en appui contre une came (6) de l'arbre d'entraînement (2) par l'intermédiaire d'un ensemble poussoir (5, 5'), de telle manière que le piston de pompe (4, 4') peut être entraîné par une rotation de l'arbre d'entraînement (2) pour effectuer un mouvement ascendant. Selon l'invention, les ensembles poussoir (5, 5') comprennent des galets (7, 7'), lesquels reposent contre une surface circonférentielle extérieure (8) de la came (6) par rapport à un axe longitudinal (A) de l'arbre d'entraînement (2) de manière axiale et de manière décalée l'un par rapport à l'autre du point de vue de leurs positions angulaires.
EP14702011.9A 2013-03-07 2014-01-30 Pompe à haute pression pour un système d'injection de carburant Active EP2964954B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102013203874 2013-03-07
DE102013206025.4A DE102013206025A1 (de) 2013-03-07 2013-04-05 Hochdruckpumpe für ein Kraftstoffeinspritzsystem
PCT/EP2014/051767 WO2014135313A1 (fr) 2013-03-07 2014-01-30 Pompe haute pression pour système d'injection de carburant

Publications (2)

Publication Number Publication Date
EP2964954A1 true EP2964954A1 (fr) 2016-01-13
EP2964954B1 EP2964954B1 (fr) 2019-05-01

Family

ID=51385619

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14702011.9A Active EP2964954B1 (fr) 2013-03-07 2014-01-30 Pompe à haute pression pour un système d'injection de carburant

Country Status (4)

Country Link
EP (1) EP2964954B1 (fr)
CN (1) CN105026753B (fr)
DE (1) DE102013206025A1 (fr)
WO (1) WO2014135313A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014225982A1 (de) * 2014-12-16 2016-06-16 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffhochdruckpumpe
GB2570154A (en) * 2018-01-15 2019-07-17 Delphi Tech Ip Ltd High pressure diesel fuel pump
DE102019208179A1 (de) * 2019-06-05 2020-12-10 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffhochdruckpumpe

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10356262A1 (de) * 2003-12-03 2005-06-30 Robert Bosch Gmbh Radialkolbenpumpe, insbesondere für Kraftstoffeinspritzsysteme
DE102008042881A1 (de) * 2008-10-16 2010-04-22 Robert Bosch Gmbh Hochdruckpumpenanordnung
DE102009001315A1 (de) * 2009-03-04 2010-09-09 Robert Bosch Gmbh Kolbenpumpe
DE102009026735A1 (de) 2009-06-04 2010-12-09 Robert Bosch Gmbh Hochdruckpumpe
DE102010030852A1 (de) * 2010-07-02 2012-01-05 Robert Bosch Gmbh Hochdruckpumpe
DE102010039269A1 (de) * 2010-08-12 2012-02-16 Robert Bosch Gmbh Kolbenpumpen für eine hydraulische Fahrzeugbremsanlage
DE102011007686A1 (de) * 2011-04-19 2012-10-25 Robert Bosch Gmbh Kraftstofffördereinrichtung für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014135313A1 *

Also Published As

Publication number Publication date
CN105026753B (zh) 2018-06-05
EP2964954B1 (fr) 2019-05-01
DE102013206025A1 (de) 2014-09-11
WO2014135313A1 (fr) 2014-09-12
CN105026753A (zh) 2015-11-04

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