EP1047876A1 - Pompe a pistons radiaux pour alimentation haute pression en carburant - Google Patents

Pompe a pistons radiaux pour alimentation haute pression en carburant

Info

Publication number
EP1047876A1
EP1047876A1 EP98966165A EP98966165A EP1047876A1 EP 1047876 A1 EP1047876 A1 EP 1047876A1 EP 98966165 A EP98966165 A EP 98966165A EP 98966165 A EP98966165 A EP 98966165A EP 1047876 A1 EP1047876 A1 EP 1047876A1
Authority
EP
European Patent Office
Prior art keywords
drive shaft
piston pump
radial piston
housing
bushing
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
EP98966165A
Other languages
German (de)
English (en)
Other versions
EP1047876B1 (fr
Inventor
Peter Grabert
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 EP1047876A1 publication Critical patent/EP1047876A1/fr
Application granted granted Critical
Publication of EP1047876B1 publication Critical patent/EP1047876B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F04B1/0421—Cylinders

Definitions

  • the invention relates to a radial piston pump for
  • Fuel injection systems of internal combustion engines in particular in a common rail injection system, with a drive shaft mounted in a pump housing, which is eccentrically formed or has cam-like elevations in the circumferential direction, and preferably with a plurality of pistons arranged radially with respect to the drive shaft in a respective cylinder space, which by
  • the pump housing comprising a basic body in which the drive shaft is mounted and a housing head for each piston, which has a fuel supply opening and is equipped with a fuel discharge opening.
  • the housing heads are made of a number of elastomeric Sealing elements supported and sealed against the basic body of the housing. This leads to an undefined arrangement of the components of the pump.
  • the invention is therefore based on the problem of providing a radial piston pump which is high-pressure-tight up to 1600 bar and in which the high-pressure components and their sealing points are decoupled from one another and statically exactly defined in the assembled state.
  • Fuel injection systems of internal combustion engines in particular in a common rail injection system, with a drive shaft mounted in a pump housing, which is eccentrically formed or has cam-like elevations in the circumferential direction, and preferably with a plurality of pistons arranged radially with respect to the drive shaft in a respective cylinder space, which rotate the drive shaft can be moved back and forth in the respective cylinder space, and with check valves on the suction side and the high pressure side, the pump housing a Gehausegroundkorper, in which the drive shaft is mounted, and each comprises a housing head for each piston, which is equipped with a fuel supply opening and a fuel discharge opening, solved in that the housing head has a radial opening to the drive shaft through which a bushing is shrunk , which is used to hold the piston.
  • the bushing is preferably a hardened bushing which has the shape of a cylinder.
  • the shrunk-in bushing provides a hard seal for the
  • the hard seal ensures a defined screwing action when attaching the housing heads to the basic body of the housing.
  • the number of individual parts is reduced compared to a conventional radial piston pump.
  • the inner circumferential surface of the bushing delimiting the cylinder space can advantageously be machined in the shrunk state, for example by grinding.
  • the housing head designed according to the invention can also be processed on a conventional honing machine in order to improve the quality of the inner circumferential surface of the shrunk bush. This ensures that the bushing functions perfectly even at peak pressures of up to 1600 bar.
  • the dead volume in the housing head is advantageously minimized by the socket.
  • a special embodiment of the invention is characterized in that the housing head rests with a flat contact surface against a flat contact surface of the basic housing body. As a result, the housing head can rest against the basic body of the housing with the flat contact surface. In this way, in comparison to conventional pump housings, there is no need to arrange any sealing elements.
  • a further special embodiment of the invention is characterized in that the through opening has a section with a larger diameter for receiving the bushing and a section with a smaller diameter for receiving a closure element.
  • the edge formed between the two sections forms a stop for the bush. This advantageously simplifies the assembly of the socket.
  • a further special embodiment of the invention is characterized in that the diameter of the section with the smaller diameter is larger than the inner diameter of the bush. It is thereby achieved that the bush protrudes with its inner peripheral edge into the through opening and forms a stop for the closure element. This has the advantage that a hard seal without any sealing elements between the closure element and the bushing can be realized.
  • Another special embodiment of the invention is characterized in that a fuel feed opening is provided in the closure element, which has a seat for the suction-side check valve, which is attached in the end of the bushing facing away from the drive shaft.
  • the suction-side check valve can comprise, for example, a ball which is pressed by a spring against the fuel supply opening provided in the closure element. This has the advantage that no further individual parts are required for the installation of the check valve on the suction side.
  • a further special embodiment of the invention is characterized in that the bushing has a radial fuel discharge bore, against the outer edge of which the high-pressure check valve comes into abutment, which is attached in the housing head.
  • the high pressure side check valve can, like the suction side
  • Check valve comprise a ball which is pressed by a spring against the fuel discharge hole provided in the socket.
  • the high-pressure check valve can be sealed off from the housing head without any sealing elements.
  • the spring-assisted design of the high-pressure check valve also has the advantage that faster closing times can be realized. This increases the efficiency of the radial piston pump.
  • a further special embodiment of the invention is characterized in that all sealing points subjected to high pressure are formed by metal components which are attracted to one another without intermediate arrangement of elastomeric sealing elements.
  • the housing head is attached to the basic body of the housing, for example, by screw connections. When the housing head is tightened against the basic body of the housing, there is a hard seal due to the preferably metallic contact surfaces. This prevents leaks in the operation of the radial piston pump.
  • the suction-side and the high-pressure side check valve are built into the housing head in a hard-sealing manner.
  • the radial piston pump according to the invention generally has the advantage that it is more compact than conventional pumps and consists of fewer individual parts.
  • Figure 1 shows a sectional view of a radial piston pump according to the invention.
  • a radial piston pump according to the invention is used in particular in common rail injection systems for supplying fuel to diesel engines.
  • Common rail means “common line” or “common distribution rail”.
  • the injection nozzles in common-rail injection systems are fed from the common distributor rail.
  • the radial piston pump shown in FIG. 1 comprises a basic body 1, in which a drive shaft 2 is mounted, of which only the center line is shown in broken lines for reasons of clarity.
  • Drive shaft 2 is equipped with an eccentrically designed shaft section 3.
  • a polygonal ring 4 is provided, against which the shaft section 3 is rotatable.
  • the ring 4 comprises a plurality of mutually offset flats against which a piston 5 is supported with a plate 6.
  • a cylindrical ring can also be used.
  • the piston 5 is accommodated in a cylinder space 7 so that it can move back and forth in the radial direction relative to the drive shaft 2.
  • the cylinder space 7 is delimited by the inner lateral surface of a bush 8.
  • the bushing 8 is shrunk into a bore 9 in a housing head 10.
  • the housing head 10 has a flat contact surface 60 with which it rests against a flat contact surface 61 of the basic housing body (FIG. 1).
  • the bore 9 extends through the housing head 10 and has a section 11 with a larger diameter and a section 12 with a smaller diameter.
  • a peripheral edge 13 is formed between the sections 11 and 12 of the bore 9 and serves as a stop for the bushing 8.
  • the annular space 18 is formed by the section of the bore 9 with the smaller diameter 12 and by a circumferential groove 19 which is fitted in a closure element 20.
  • a transverse bore 21 and a longitudinal bore 22 are made, which are connected to each other.
  • a recess is provided in the closure element 20, which tapered to an angle of approximately 90 '.
  • the depression forms a seat 24 for a ball 25, which belongs to a check valve on the suction side.
  • the ball 25 is pressed against the seat 24 by a spring 27.
  • the check valve formed by the spring 27 and the ball 25 is fastened by a valve bushing 26 in the bushing 8.
  • the valve bushing 26 has a flange 29 which serves as an axial fixation.
  • the cylinder space 7 is radial
  • a check valve 32 is arranged between the fuel discharge duct 38 and the fuel discharge bore 30.
  • Check valve 32 includes a spring 33 which presses a ball 34 against a seat 31 which is in one end of the
  • Fuel discharge hole 30 is provided.
  • a mounting hole 36 is provided in the housing head 10 for the installation of the check valve 32.
  • a screw plug 35 is screwed into the mounting hole 36 and serves for sealing.
  • the housing head 10 is fastened to the basic housing body 1 by screws 51, 52, which extend through the housing head 10 and are screwed into threaded blind holes 54, 55 in the basic housing body 1. To seal the
  • a high-pressure sealing element 58 is fitted between the fuel discharge duct 38 and the housing head 10 and the basic housing body 1.
  • the low-pressure sealing of the closure element 20 to the outside is achieved by an O-ring.

Landscapes

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

Abstract

L'invention concerne une pompe à pistons radiaux pour l'alimentation haute pression en carburant, comportant un arbre d'entraînement (2) monté dans un carter de pompe (1, 10), et de préférence plusieurs pistons (5) logés dans une chambre de cylindre (7) respective, radialement par rapport à l'arbre d'entraînement. Le carter de pompe comprend un corps de base (1), dans lequel est monté l'arbre d'entraînement (2), et respectivement une tête (10) pour chaque piston (5). Dans une pompe à pistons radiaux traditionnelle à support intérieur, les têtes de carter sont supportées et étanchéifiées, par rapport au corps de base du carter, par un certain nombre d'éléments d'étanchéité élastomères. Il s'ensuit une configuration indéfinie des éléments de la pompe. L'invention vise à créer une pompe à pistons radiaux étanche à des pressions élevées atteignant 1600 bars, dans laquelle les composants soumis à haute pression et leurs zones d'étanchéité sont découplés et définis avec une précision statique une fois montés. A cet effet, la tête de carter (10) présente une ouverture de passage (9) s'étendant radialement par rapport à l'arbre d'entraînement (2) et dans laquelle est emmanchée une douille (8) servant à loger le piston (5).
EP98966165A 1998-01-16 1998-11-25 Pompe a pistons radiaux pour alimentation haute pression en carburant Expired - Lifetime EP1047876B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19801353 1998-01-16
DE19801353A DE19801353A1 (de) 1998-01-16 1998-01-16 Radialkolbenpumpe zur Kraftstoffhochdruckversorgung
PCT/DE1998/003467 WO1999036698A1 (fr) 1998-01-16 1998-11-25 Pompe a pistons radiaux pour alimentation haute pression en carburant

Publications (2)

Publication Number Publication Date
EP1047876A1 true EP1047876A1 (fr) 2000-11-02
EP1047876B1 EP1047876B1 (fr) 2003-02-26

Family

ID=7854729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98966165A Expired - Lifetime EP1047876B1 (fr) 1998-01-16 1998-11-25 Pompe a pistons radiaux pour alimentation haute pression en carburant

Country Status (5)

Country Link
US (1) US6698399B1 (fr)
EP (1) EP1047876B1 (fr)
JP (1) JP2002509224A (fr)
DE (2) DE19801353A1 (fr)
WO (1) WO1999036698A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20008015U1 (de) 2000-05-05 2000-08-31 Neuman & Esser Maschinenfabrik GmbH & Co. KG, 52531 Übach-Palenberg Geschrumpfter Zylinder für Hochdruck-Kolbenkompressoren
DE10239728A1 (de) * 2002-08-29 2004-03-11 Robert Bosch Gmbh Pumpe, insbesondere für eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10322595B4 (de) * 2003-05-20 2013-02-28 Robert Bosch Gmbh Kolbenpumpe, sowie Verfahren zu ihrer Herstellung
GB0715982D0 (en) * 2007-08-15 2007-09-26 Itw Ltd Check valve
EP2212554B1 (fr) * 2007-10-15 2012-08-29 ixetic Bad Homburg GmbH Pompe à pistons radiaux
US8047503B2 (en) * 2008-02-26 2011-11-01 Eaton Corporation Conical spring bushing
WO2009139145A1 (fr) * 2008-05-14 2009-11-19 有限会社入交昭一郎 Pompe diesel
IT1399872B1 (it) * 2010-05-17 2013-05-09 Magneti Marelli Spa Pompa carburante per un sistema di iniezione diretta
WO2015169621A1 (fr) * 2014-05-05 2015-11-12 Robert Bosch Gmbh Pompe haute pression pour l'alimentation d'un carburant dans un moteur à combustion interne
WO2016102138A1 (fr) * 2014-12-24 2016-06-30 Robert Bosch Gmbh Unité de pompe pour fournir un carburant, de préférence un carburant diesel, à un moteur à combustion interne

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3306211A (en) * 1964-03-16 1967-02-28 Munchner Motorzubehor G M B H Piston pumps
FR2288884A1 (fr) * 1974-04-19 1976-05-21 Bennes Marrel Pompe, notamment pour les circuits d'huile
JPS635158A (ja) * 1986-06-24 1988-01-11 Diesel Kiki Co Ltd ユニツトインジエクタ−
IT1218675B (it) * 1987-08-25 1990-04-19 Weber Srl Pompa a stantuffi radiali in particolare pompa per l'iniezione di combustibile in motori a ciclo diesel
US5035221A (en) * 1989-01-11 1991-07-30 Martin Tiby M High pressure electronic common-rail fuel injection system for diesel engines
EP0378967B1 (fr) * 1989-01-19 1993-01-27 GebràœDer Sulzer Aktiengesellschaft Compresseur à piston
US5338160A (en) * 1989-09-18 1994-08-16 Gesellschaft fur okologische Okomobil Technologie fur Fahrzeuge GmbH Individual controllable cylinder-plunger assemblies of a radial piston pump
IT1261556B (it) * 1992-04-27 1996-05-23 Elasis Sistema Ricerca Fiat Pompa a pistoni radiali, in particolare per il combustibile di motori a combustione interna.
US5364234A (en) * 1992-05-20 1994-11-15 Karl Eickmann High pressure devices
US5354183A (en) * 1993-02-11 1994-10-11 Elasis Sistema Ricerca Fiat Nel Mezzogiorno Societa Consortile Per Azioni Pumping device with a main pumping stage and a supply pump
DE4401074B4 (de) * 1994-01-15 2007-01-18 Robert Bosch Gmbh Pumpenanordnung, insbesondere zur Förderung von Kraftstoff aus einem Vorratsbehälter zu einer Brennkraftmaschine
DE19523283B4 (de) * 1995-06-27 2006-01-19 Robert Bosch Gmbh Pumpe, insbesondere Hochdruckpumpe für eine Kraftstoffeinspritzvorrichtung eines Verbrennungsmotors
DE19530012A1 (de) * 1995-08-16 1997-02-20 Bosch Gmbh Robert Hydraulikgehäuseblock mit einer Kolbenpumpe
DE59706937D1 (de) * 1996-07-01 2002-05-16 Rexroth Mannesmann Gmbh Vorrichtung zur Stabilisierung des Exzenterrings einer Radialkolbenpumpe
US5865087A (en) * 1996-10-18 1999-02-02 Olson; Howard A. Rotary variable displacement fluid power device
DE29708906U1 (de) * 1997-05-21 1997-07-17 Lang Apparatebau Gmbh, 83313 Siegsdorf Kolbenmembranpumpe mit dichtungsloser Kolben-Zylindereinheit

Non-Patent Citations (1)

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Title
See references of WO9936698A1 *

Also Published As

Publication number Publication date
JP2002509224A (ja) 2002-03-26
DE19801353A1 (de) 1999-07-22
WO1999036698A1 (fr) 1999-07-22
DE59807345D1 (de) 2003-04-03
EP1047876B1 (fr) 2003-02-26
US6698399B1 (en) 2004-03-02

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