EP1047876B1 - Pompe a pistons radiaux pour alimentation haute pression en carburant - Google Patents

Pompe a pistons radiaux pour alimentation haute pression en carburant Download PDF

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Publication number
EP1047876B1
EP1047876B1 EP98966165A EP98966165A EP1047876B1 EP 1047876 B1 EP1047876 B1 EP 1047876B1 EP 98966165 A EP98966165 A EP 98966165A EP 98966165 A EP98966165 A EP 98966165A EP 1047876 B1 EP1047876 B1 EP 1047876B1
Authority
EP
European Patent Office
Prior art keywords
housing
fuel
piston pump
radial piston
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.)
Expired - Lifetime
Application number
EP98966165A
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German (de)
English (en)
Other versions
EP1047876A1 (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
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Robert Bosch GmbH
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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

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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
    • F04B1/0421—Cylinders

Definitions

  • the invention relates to a radial piston pump for High pressure fuel supply at Fuel injection systems of internal combustion engines, especially with a common rail injection system a drive shaft mounted in a pump housing, the is eccentric or in the circumferential direction has cam-like elevations, and with several with respect to the drive shaft radially in one in one Recording the piston serving socket formed Pistons arranged by turning the cylinder chamber Drive shaft back and forth in the respective cylinder space are movable, and with check valves on the Intake side and the high pressure side, the pump housing a housing base in which the drive shaft is mounted and includes a housing head for each piston, the housing head being radial to the drive shaft has extending through opening, and with a Fuel supply opening and a fuel discharge opening, the fuel discharge opening in the housing head is arranged.
  • a radial piston pump is known from US Pat. No. 5,571,243 High pressure fuel supply at Fuel injection systems known in which the Pump housing from a basic housing body, a Pump head and a bushing receiving the piston. There are a supply opening and a in the housing head Discharge opening provided for the fuel. The required check valves on the intake side and the high pressure side are in between the housing head and Socket clamped valve plate arranged.
  • This Radial piston pump is the number of components and the number High-pressure sealing points higher than with the FR-A- 2 288 884. These components are in the assembled state statically overdetermined. This leads to an elaborate Manufacturing and assembly and can cause operational problems of the pump.
  • the invention is therefore based on the problem, one to two To provide 1600 bar high-pressure-tight radial piston pump, where the number of high pressure components and whose sealing points are minimized and where the function the radial piston pump largely independent of the Pairing between socket, basic body and housing head is.
  • the problem is with a radial piston pump High pressure fuel supply at Fuel injection systems of internal combustion engines, especially with a common rail injection system a drive shaft mounted in a pump housing, the is eccentric or in the circumferential direction has cam-like elevations, and with several with respect to the drive shaft radially in one in one Recording the piston serving socket formed Pistons arranged by turning the cylinder chamber Drive shaft back and forth in the respective cylinder space are movable, and with check valves on the Intake side and the high pressure side, the pump housing a housing base in which the drive shaft is mounted and includes a housing head for each piston, the housing head being radial to the drive shaft has extending through opening, and with a Fuel supply opening and a fuel discharge opening, the fuel discharge opening in the housing head is arranged, solved in that the Fuel supply opening is arranged in the housing head, that the check valves on the suction side and the High pressure side are arranged in the housing head, and that the socket is shrunk into the housing head.
  • the socket is preferably a hardened bush, which has the shape of a cylinder.
  • the shrunk bushing creates a hard seal of the cylinder space reached.
  • the hard seal ensures a defined screwing case when fastening of the housing heads on the housing base body.
  • the the Inner surface area of the bushing which defines the cylinder space can be shrink-wrapped in an advantageous manner Condition can be edited, for example, by grinding.
  • the housing head designed according to the invention can also on a conventional honing machine to process the Quality of the inner surface of the shrunk To improve jack. Thus, even at peak pressures at 1600 bar, the socket functions perfectly guaranteed. Finally, the dead volume in the Housing head through the socket in an advantageous manner minimized.
  • Another special embodiment of the invention is characterized in that the through opening a Larger diameter section for receiving the bushing and a smaller diameter section for receiving has a closure element.
  • the one between the two Sections formed edge forms a stop for that Rifle. This makes mounting the socket advantageous simplified.
  • Another special embodiment of the invention is characterized in that the diameter of the section with the smaller diameter is larger than that Inner diameter of the socket. This ensures that the With its inner circumferential edge in the Through opening protrudes and a stop for the Closing element forms. This has the advantage that between the closure element and the bushing a hard seal without the interposition of any sealing elements can be realized.
  • Fuel supply opening is provided, which is a seat for has the suction-side check valve, which in the of end of the socket facing away from the drive shaft is.
  • the check valve on the suction side can, for example include a ball that is supported by a spring against that in the Closure element provided fuel supply opening is pressed. This has the advantage that for the installation of the check valve on the suction side no further individual parts are needed.
  • the bushing has a radial Has fuel discharge hole, against the outer edge the high-pressure check valve comes into operation, which is attached in the housing head.
  • the high pressure side Check valve can, like the suction side Check valve, include a ball by a spring against the fuel discharge hole provided in the socket is pressed. Sealing the high pressure side Check valve against the housing head can without Intermediate arrangement of any sealing elements realized become.
  • the spring-supported training of the check valve on the high-pressure side also has the advantage that faster closing times can be realized. This increases the efficiency of the radial piston pump.
  • Another special embodiment of the invention is characterized in that all with high pressure acted upon sealing points of tightened against each other metallic components without intermediate elastomer Sealing elements are formed.
  • the attachment of the Housing head on the housing base body achieved for example by screw connections. At the Tighten the housing head against the housing base there is a hard seal through the preferably metallic contact surfaces. This will prevent leaks in the Operation of the radial piston pump avoided.
  • 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.
  • the radial piston pump shown in Figure 1 includes a Basic housing body 1 in which a drive shaft 2 is mounted is only of which, for reasons of clarity Center line is shown in dash-dot lines.
  • the Drive shaft 2 is designed with an eccentric Shaft section 3 equipped.
  • On the eccentric Shaft section 3 is a polygonal ring 4 provided against which the shaft section 3 is rotatable is.
  • the ring 4 comprises several staggered Flattening against each of which a piston 5 with a Plate 6 supports.
  • a cylindrical ring can also be used.
  • the piston 5 is in a cylinder space 7 to the drive shaft 2 in radial direction back and forth added.
  • the cylinder space 7 is a by the inner lateral surface Socket 8 limited.
  • the socket 8 is in a bore 9 in a housing head 10 shrunk.
  • the housing head 10 has a flat contact surface 60, with which it is against a flat Contact surface 61 of the basic housing body (1) abuts.
  • the Bore 9 extends through the housing head 10 and has a section 11 with a larger diameter and one Section 12 with a smaller diameter. Between Sections 11 and 12 of bore 9 is circumferential Edge 13 formed as a stop for the bushing 8 serves.
  • the high pressure fuel passes through more channels in a common, not shown Rail.
  • a depression is provided at an angle of approximately 90 ° tapered.
  • the depression forms a seat 24 for one Ball 25 leading to a suction check valve heard.
  • the ball 25 is against the by a spring 27 Seat 24 pressed. That of the spring 27 and the ball 25
  • the valve bushing 26 has one Flange 29, which serves as an axial fixation.
  • the cylinder space 7 is radial Fuel discharge hole 30 in the socket 8 with a Fuel discharge duct 38 in connection. Between the Fuel discharge duct 38 and the fuel discharge bore 30 a check valve 32 is arranged.
  • the Check valve 32 includes a spring 33 that has a ball 34 pushes against a seat 31 which in one end of the Fuel discharge hole 30 is provided.
  • Mounting hole 36 provided. In the mounting hole 36 is a screw plug 35 screwed in for sealing serves.
  • the attachment of the housing head 10 on the Housing base body 1 is made by screws 51, 52 extend through the housing head 10 and in Threaded blind holes 54, 55 in the basic housing body 1 be screwed in.
  • a high-pressure sealing element 58 fitted to seal the Fuel discharge channel 38 is between the housing head 10 and the housing base body 1 .
  • the sealing element 20 on the low-pressure side 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)

Claims (7)

  1. Pompe à pistons radiaux pour l'alimentation haute pression en carburant de moteurs à combustion interne en particulier pour un système d'injection par rampe commune (Common-Rail), comprenant
    un arbre d'entraínement (2) réalisé excentrique ou présentant des excroissances en forme de cames, monté dans un boítier de pompe (1, 10),
    plusieurs pistons (5) disposés radialement par rapport à l'arbre d'entraínement, dans une chambre de cylindre (7) formée dans une douille servant à recevoir les pistons (5), ces pistons se déplaçant en va et vient, du fait de la rotation de l'arbre d'entraínement (2), dans la chambre de cylindre correspondante (7),
    des soupapes anti-retour (26, 32) du côté de l'aspiration et du côté haute pression, le boítier de pompe comprenant un corps de base de boítier (1) dans lequel est monté l'arbre d'entraínement et comprenant une tête de boítier (10) pour chacun des pistons (5), la tête de boítier (10) présentant une ouverture traversante (9) s'étendant radialement par rapport à l'arbre d'entraínement (2),
    une ouverture d'arrivée de carburant (15),
    une ouverture de sortie de carburant (38) se trouvant à la tête de boítiers (10,
    caractérisée en ce que
    l'ouverture d'arrivée de carburant (15) se trouve dans la tête de boítier (10), les soupapes anti-retour (26, 32) sont montées du côté aspiration et du côté haute pression dans la tête de boítier (10), et la douille (8) est emboítée dans la tête (10).
  2. Pompe à pistons radiaux selon la revendication 1,
    caractérisée en ce que
    la tête de boítier (10) repose avec une surface d'appui (60) plane contre une surface d'appui (61) du corps de base du boítier (1).
  3. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    l'ouverture traversante (9) présente un segment (11) de grand diamètre pour recevoir la douille (8) et un segment (12) ayant un diamètre inférieur pour recevoir un élément de verrouillage (20).
  4. Pompe à pistons radiaux selon la revendication 3,
    caractérisée en ce que
    le diamètre du segment (12) de diamètre inférieur est supérieur au diamètre intérieur de la douille (8).
  5. Pompe à pistons radiaux selon l'une quelconque des revendications 3 ou 4,
    caractérisée en ce qu'
    une ouverture d'arrivée de carburant (22) est prévue dans l'élément de verrouillage (20), cette ouverture présentant un siège (24) pour la soupape antiretour (25, 26, 27) du côté aspiration, montée à l'extrémité de la douille (8) opposée à l'arbre d'entraínement (2).
  6. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la douille (8) présente une ouverture de sortie de carburant (30) contre le bord extérieur de laquelle vient buter la soupape antiretour (34) se trouvant du côté haute pression, montée dans la tète de boítier (10).
  7. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    tous les points d'étanchéité des pièces métalliques amenées les unes contre les autres sont réalisés sans que l'on intercale des éléments d'étanchéification en élastomère.
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 EP1047876A1 (fr) 2000-11-02
EP1047876B1 true 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

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
EP1047876A1 (fr) 2000-11-02
US6698399B1 (en) 2004-03-02

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