EP1047876B1 - Radial piston pump for high pressure fuel supply - Google Patents

Radial piston pump for high pressure fuel supply 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
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EP
European Patent Office
Prior art keywords
housing
fuel
piston pump
radial piston
drive shaft
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EP98966165A
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German (de)
French (fr)
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EP1047876A1 (en
Inventor
Peter Grabert
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404Details or component parts
    • F04B1/0421Cylinders

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.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Radialkolbenpumpe zur Kraftstoffhochdruckversorgung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere bei einem Common-Rail-Einspritzsystem, mit einer in einem Pumpengehäuse gelagerten Antriebswelle, die exzentrisch ausgebildet ist oder in Umfangsrichtung nockenartige Erhebungen aufweist, und mit mehreren bezüglich der Antriebswelle radial in einem in einer zur Aufnahme des Kolbens dienenden Buchse gebildeten Zylinderraum angeordneten Kolben, die durch Drehen der Antriebswelle in dem jeweiligen Zylinderraum hin und her bewegbar sind, und mit Rückschlagventilen auf der Ansaugseite und der Hochdruckseite, wobei das Pumpengehäuse einen Gehäusegrundkörper, in dem die Antriebswelle gelagert ist, und jeweils einen Gehäusekopf für jeden Kolben umfaßt, wobei der Gehäusekopf eine zu der Antriebswelle radial verlaufende Durchgangsöffnung aufweist, und mit einer Kraftstoffzuführöffnung und einer Kraftstoffabführöffnung, wobei die Kraftstoffabführöffnung in dem Gehäusekopf angeordnet ist.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.

Bei dieser aus der FR-A- 2 288 884 bekannten Niederdruck-Ölpumpe sind die Ölzuführöffnung, das Rückschlagventil auf der Ansaugseite und die Buchse im Gehäusegründkörper angeordnet. Dies führt dazu, daß zwischen Gehäusegrundkörper und Gehäusekopf eine den Druck auf der Förderseite der Pumpe abdichtende Dichtung vorgesehen werden muß. Außerdem kann die Funktion der Ölpumpe nur in montierten Zustand geprüft werden. Die der in der FR-A- 2 288 884 beschriebenen Ölpumpe zugrunde liegende Aufgabe bestand darin, eine einfache und kostengünstige Ölpumpe bereitzustellen.In this low-pressure oil pump known from FR-A-2 288 884 are the oil supply opening, the check valve on the suction side and the socket in the housing base arranged. This means that between Housing main body and housing head the pressure on the Sealing seal provided on the delivery side of the pump must become. In addition, the function of the oil pump can only be in assembled condition. The one in FR-A-2 288 884 described oil pump underlying task consisted of a simple and inexpensive oil pump provide.

Aus der US 5,571,243 ist eine Radialkolbenpumpe zur Kraftstoffhochdruckversorgung bei Kraftstoffeinspritzsystemen bekannt, bei der das Pumpengehäuse aus einem Gehäusegrundkörper, einem Pumpenkopf und eine den Kolben aufnehmenden Buchse besteht. Im Gehäusekopf sind eine Zufuhröffnung und eine Abfuhröffnung für den Kraftstoff vorgesehen. Die erforderlichen Rückschlagventile auf der Ansaugseite und der Hochdruckseite sind in einer zwischen Gehäusekopf und Buchse eingespannten Ventilplacte angeordnet. Bei dieser Radialkolbenpumpe ist die Zahl der Bauteile und der mit Hochdruck beaufschlagten Dichtstellen höher als bei der FR-A- 2 288 884. In montierten Zustand sind diese Bauteile statisch überbestimmt. Dies führt zu einer aufwendigen Fertigung und Montage und kann zu Problemen beim Betrieb der Pumpe führen.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. At 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.

Der Erfindung liegt daher das Problem zugrunde, eine bis 1600 bar hochdruckdichte Radialkolbenpumpe bereitzustellen, bei der die Zahl der hochdruckbeaufschlagten Bauteile und deren Dichtstellen minimiert ist und bei der die Funktion der Radialkolbenpumpe weitestgehend unabhängig von der Paarung zwischen Buchse, Gehäusegrundkörper und Gehäusekopf ist.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.

Das Problem ist bei einer Radialkolbenpumpe zur Kraftstoffhochdruckversorgung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere bei einem Common-Rail-Einspritzsystem, mit einer in einem Pumpengehäuse gelagerten Antriebswelle, die exzentrisch ausgebildet ist oder in Umfangsrichtung nockenartige Erhebungen aufweist, und mit mehreren bezüglich der Antriebswelle radial in einem in einer zur Aufnahme des Kolbens dienenden Buchse gebildeten Zylinderraum angeordneten Kolben, die durch Drehen der Antriebswelle in dem jeweiligen Zylinderraum hin und her bewegbar sind, und mit Rückschlagventilen auf der Ansaugseite und der Hochdruckseite, wobei das Pumpengehäuse einen Gehäusegrundkörper, in dem die Antriebswelle gelagert ist, und jeweils einen Gehäusekopf für jeden Kolben umfaßt, wobei der Gehäusekopf eine zu der Antriebswelle radial verlaufende Durchgangsöffnung aufweist, und mit einer Kraftstoffzuführöffnung und einer Kraftstoffabführöffnung, wobei die Kraftstoffabführöffnung in dem Gehäusekopf angeordnet ist, dadurch gelöst, daß die Kraftstoffzuführöffnung in dem Gehäusekopf angeordnet ist, daß die Rückschlagventile auf der Ansaugseite und der Hochdruckseite in dem Gehäusekopf angeordnet sind, und daß die Buchse in den Gehäusekopf eingeschrumpft ist.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.

Dadurch, daß bei der erfindungsgemäßen Radialkolbenpumpe alle hydraulischen Bauteile - Buchse, Kolben, Zufuhr und Abführöffnungen sowie die zugehörigen Rückschlagventile in dem Gehäusekopf integriert sind, ist die Funktion der Radialkolbenpumpe weitestgehend unabhängig von der Paaarung zwischen Buchse, Gehäusegrundkörper und Gehäusekopf, so daß die Serienfertigung der erfindungsgemäßen Radialkolbenpumpe vereinfacht und deren Lebensdauer erhöht wird. Außerdem kann jeder Gehäusekopf schon in vormontiertem Zustand auf seine hydraulische Funktionsfähigkeit geprüft werden, und evtl. vorhandene Fehlfunktionen leichter und kostengünstiger erkannt und behoben werden.The fact that in the radial piston pump according to the invention all hydraulic components - bushing, piston, feed and Discharge openings and the associated check valves in the housing head are integrated, is the function of Radial piston pump largely independent of the pairing between the socket, housing base and housing head, so that series production of the radial piston pump according to the invention simplified and their lifespan is increased. Moreover can each housing head already in the pre-assembled state its hydraulic functionality is checked, and possible malfunctions easier and can be recognized and remedied more economically.

Darüber hinaus wird die Anzahl der Einzelteile und Dichtstellen gegenüber einer herkömmlichen Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung reduziert.In addition, the number of items and Sealing points compared to a conventional one Radial piston pump for high-pressure fuel generation reduced.

Bei der Buchse handelt es sich vorzugsweise um eine gehärtete Buchse, welche die Form eines Zylinders hat. Durch die eingeschrumpfte Buchse wird eine harte Abdichtung des Zylinderraums erreicht. Die harte Abdichtung gewährleistet einen definierten Schraubfall beim Befestigen der Gehäuseköpfe an dem Gehäusegrundkörper. Die den Zylinderraum begrenzende innere Mantelfläche der Buchse kann in vorteilhafter Art und Weise im eingeschrumpften Zustand beispielsweise durch Schleifen bearbeitet werden. Der erfindungsgemäß ausgebildete Gehäusekopf kann zudem auf einer konventionellen Honmaschine bearbeitet werden, um die Qualität der inneren Mantelfläche der eingeschrumpften Buchse zu verbessern. Somit ist auch bei Spitzendrücken bis zu 1600 bar eine einwandfreie Funktion der Buchse gewährleistet. Schließlich wird das Totvolumen in dem Gehäusekopf durch die Buchse in vorteilhafter Weise minimiert. 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.

Eine besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß der Gehäusekopf mit einer ebenen Anlagefläche gegen eine ebene Anlagefläche des Gehäusegrundkörpers anliegt. Dadurch kann der Gehäusekopf statisch genau bestimmt mit der ebenen Anlagefläche an dem Gehäusegrundkörper anliegen. Dadurch kann im Vergleich zu herkömmlichen Pumpengehäusen auf die Zwischenordnung irgendwelcher Dichtungselemente verzichtet werden.This is a special embodiment of the invention characterized in that the housing head with a flat Contact surface against a flat contact surface of the Basic body rests. This allows the housing head statically determined with the flat contact surface on the Fit the basic body of the housing. This can be compared to conventional pump housings on the intermediate arrangement any sealing elements are dispensed with.

Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß die Durchgangsöffnung einen Abschnitt mit größerem Durchmesser zur Aufnahme der Buchse und einen Abschnitt mit kleinerem Durchmesser zur Aufnahme eines Verschlußelements aufweist. Die zwischen den beiden Abschnitten gebildete Kante bildet einen Anschlag für die Buchse. Dadurch wird die Montage der Buchse vorteilhaft vereinfacht.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.

Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß der Durchmesser des Abschnitts mit dem kleineren Durchmesser größer ist als der Innendurchmesser der Buchse. Dadurch wird erreicht, daß die Buchse mit ihrer inneren Umlaufkante in die Durchgangsöffnung hineinragt und einen Anschlag für das Verschlußelement bildet. Das hat den Vorteil, daß zwischen dem Verschlußelement und der Buchse eine harte Abdichtung ohne Zwischenordnung irgendwelcher Dichtungselemente realisiert werden kann.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.

Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß in dem Verschlußelement eine Kraftstoffzuführöffnung vorgesehen ist, die einen Sitz für das saugseitige Rückschlagventil aufweist, das in dem von der Antriebswelle abgewandten Ende der Buchse angebracht ist. Das saugseitige Rückschlagventil kann beispielsweise eine Kugel umfassen, die durch eine Feder gegen die in dem Verschlußelement vorgesehene Kraftstoffzuführöffnung gedrückt wird. Das hat den Vorteil, daß für den Einbau des saugseitigen Rückschlagventils keine weiteren Einzelteile benötigt werden.Another special embodiment of the invention is characterized in that in the closure element 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.

Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß die Buchse eine radiale Kraftstoffabführbohrung aufweist, gegen deren äußeren Rand das hochdruckseitige Rückschlagventil in Anschlag kommt, das in dem Gehäusekopf angebracht ist. Das hochdruckseitige Rückschlagventil kann, wie das saugseitige Rückschlagventil, eine Kugel umfassen, die durch eine Feder gegen die in der Buchse vorgesehene Kraftstoffabführbohrung gedrückt wird. Die Abdichtung des hochdruckseitigen Rückschlagventils gegenüber dem Gehäusekopf kann ohne Zwischenordnung irgendwelcher Dichtungselemente realisiert werden. Die federunterstützte Ausbildung des hochdruckseitigen Rückschlagventils hat zudem den Vorteil, daß schnellere Schließzeiten realisiert werden können. Dadurch wird die Effizienz der Radialkolbenpumpe erhöht.Another special embodiment of the invention is characterized in that 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.

Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß alle mit Hochdruck beaufschlagten Dichtstellen von gegeneinander angezogenen metallischen Bauteilen ohne Zwischenordnung elastomerer Dichtungselemente gebildet sind. Die Befestigung des Gehäusekopfes auf dem Gehäusegrundkörper wird beispielsweise durch Schraubverbindungen erreicht. Beim Anziehen des Gehäusekopfes gegen den Gehäusegrundkörper erfolgt eine harte Abdichtung durch die vorzugsweise metallischen Anlageflächen. Dadurch werden Leckagen im Betrieb der Radialkolbenpumpe vermieden. Darüber hinaus sind auch das saugseitige und das hochdruckseitige Rückschlagventil hartabdichtend in den Gehäusekopf eingebaut.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. Furthermore are also the suction side and the high pressure side Check valve hard sealing in the housing head built-in.

Die erfindungsgemäße Radialkolbenpumpe hat allgemein den Vorteil, daß sie kompakter ist als herkömmliche Pumpen und aus weniger Einzelteilen besteht.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.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen sowie der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein Ausführungsbeispiel im Einzelnen beschrieben ist. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein. Ein Weg zum Ausführen der beanspruchten Erfindung ist nachfolgend anhand der Zeichnung im Einzelnen erläutert.

Figur 1
zeigt eine Schnittdarstellung einer erfindungsgemäßen Radialkolbenpumpe.
Further advantages, features and details of the invention emerge from the subclaims and the following description, in which an exemplary embodiment is described in detail with reference to the drawing. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination. One way of carrying out the claimed invention is explained in detail below with reference to the drawing.
Figure 1
shows a sectional view of a radial piston pump according to the invention.

In der Darstellung von Figur 1 ist nur eine Hälfte einer erfindungsgemäßen Radialkolbenpumpe teilweise im Schnitt dargestellt. Die erfindungsgemäße Radialkolbenpumpe wird insbesondere in Common-Rail-Einspritzsystemen zur Kraftstoffversorgung von Dieselmotoren eingesetzt. Dabei bedeutet "common rail" soviel wie "gemeinsame Leitung" oder "gemeinsame Verteilerleiste". Im Gegensatz zu herkömmlichen Hochdruckeinspritzsystemen, in denen der Kraftstoff über getrennte Leitungen zu den einzelnen Brennräumen gefördert wird, werden die Einspritzdüsen in Common-Rail-Einspritzsystemen aus der gemeinsamen Verteilerleiste gespeist.In the illustration in FIG. 1, only one half is one Radial piston pump according to the invention partly in section shown. The radial piston pump according to the invention is especially in common rail injection systems Fuel supply used by diesel engines. there "common rail" means "common line" or "common distribution bar". In contrast to conventional ones High pressure injection systems in which the fuel is over separate lines to the individual combustion chambers are promoted the injectors in common rail injection systems from the common distribution bar fed.

Die in der Figur 1 gezeigte Radialkolbenpumpe umfaßt einen Gehäusegrundkörper 1, in dem eine Antriebswelle 2 gelagert ist, von der aus Gründen der Übersichtlichkeit nur die Mittellinie strichpunktiert dargestellt ist. Die Antriebswelle 2 ist mit einem exzentrisch ausgebildeten Wellenabschnitt 3 ausgestattet. Auf dem exzentrischen Wellenabschnitt 3 ist ein polygonförmiger Ring 4 vorgesehen, gegenüber dem der Wellenabschnitt 3 drehbar ist. Der Ring 4 umfaßt mehrere zueinander versetzte Abflachungen gegen die sich jeweils ein Kolben 5 mit einer Platte 6 abstützt. Statt des polygonförmigen Rings 4 kann auch ein zylinderförmiger Ring verwendet werden. Der Kolben 5 ist in einem Zylinderraum 7 zur Antriebswelle 2 in radialer Richtung hin- und herbewegbar aufgenommen.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. Instead of the polygonal ring 4 can 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.

Der Zylinderraum 7 wird durch die innere Mantelfläche einer Buchse 8 begrenzt. Die Buchse 8 ist in eine Bohrung 9 in einem Gehäusekopf 10 eingeschrumpft. Der Gehäusekopf 10 hat eine ebene Anlagefläche 60, mit der er gegen eine ebene Anlagefläche 61 des Gehäusegrundkörpers (1) anliegt. Die Bohrung 9 erstreckt sich durch den Gehäusekopf 10 und hat einen Abschnitt 11 mit einem größeren Durchmesser und einen Abschnitt 12 mit einem kleineren Durchmesser. Zwischen den Abschnitten 11 und 12 der Bohrung 9 ist eine umlaufende Kante 13 ausgebildet, die als Anschlag für die Buchse 8 dient.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.

In dem Gehäusegrundkörper 1 und dem Gehäusekopf 10 sind mehrere Kraftstoffkanäle angebracht. Durch die Kanäle, von denen nur einige in Figur 1 gezeigt sind, wird Kraftstoff durch eine Vorförderpumpe aus einem Kraftstofftank in den Zylinderraum 7 gefördert. In dem Zylinderraum 7 wird der Kraftstoff durch den Kolben 5 mit Hochdruck beaufschlagt. In the housing body 1 and the housing head 10 are several fuel channels attached. Through the canals, from only a few of which are shown in Figure 1 becomes fuel through a prefeed pump from a fuel tank into the Cylinder chamber 7 promoted. In the cylinder space 7 High pressure fuel is applied through the piston 5.

Der mit Hochdruck beaufschlagte Kraftstoff gelangt durch weitere Kanäle in eine nicht dargestellte gemeinsame Verteilerleiste.The high pressure fuel passes through more channels in a common, not shown Rail.

Wie in Figur 1 zu sehen ist, erstreckt sich ein Kraftstoffzuführkanal 15 durch den Gehäusekopf 10. Durch den Kraftstoffzuführkanal wird Kraftstoff in Richtung des Pfeils 16 in einen Ringraum 18 gefördert. Der Ringraum 18 wird von dem Abschnitt der Bohrung 9 mit dem kleineren Durchmesser 12 und von einer Umfangsnut 19 gebildet, die in einem Verschlußelement 20 angebracht ist. In dem Verschlußelement 20 sind eine Querbohrung 21 und eine Längsbohrung 22 angebracht, die miteinander in Verbindung stehen.As can be seen in Figure 1, one extends Fuel supply channel 15 through the housing head 10. By the fuel supply channel becomes fuel towards the Arrow 16 promoted in an annular space 18. The annular space 18 is from the section of bore 9 with the smaller Diameter 12 and formed by a circumferential groove 19 which in a closure element 20 is attached. By doing Closure element 20 are a transverse bore 21 and a Longitudinal bore 22 attached to each other stand.

Am Ende der Längsbohrung 22 ist in dem Verschlußelement 20 eine Senkung vorgesehen, die in einem Winkel von etwa 90° spitz zuläuft. Die Senkung bildet einen Sitz 24 für eine Kugel 25, die zu einem saugseitigen Rückschlagventil gehört. Die Kugel 25 wird durch eine Feder 27 gegen den Sitz 24 gedrückt. Das von der Feder 27 und der Kugel 25 gebildete Rückschlagventil ist durch eine Ventilbuchse 26 in der Buchse 8 befestigt. Die Ventilbuchse 26 weist einen Flansch 29 auf, der als axiale Fixierung dient.At the end of the longitudinal bore 22 is in the closure element 20th 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 Check valve formed by a valve bushing 26 attached in the socket 8. The valve bushing 26 has one Flange 29, which serves as an axial fixation.

Der Zylinderraum 7 steht über eine radiale Kraftstoffabführbohrung 30 in der Buchse 8 mit einem Kraftstoffabführkanal 38 in Verbindung. Zwischen dem Kraftstoffabführkanal 38 und der Kraftstoffabführbohrung 30 ist ein Rückschlagventil 32 angeordnet. Das Rückschlagventil 32 umfaßt eine Feder 33, die eine Kugel 34 gegen einen Sitz 31 drückt, der in einem Ende der Kraftstoffabführbohrung 30 vorgesehen ist. Für den Einbau des Rückschlagventils 32 ist in dem Gehäusekopf 10 eine Montagebohrung 36 vorgesehen. In die Montagebohrung 36 ist eine Verschlußschraube 35 eingeschraubt, die zur Abdichtung dient.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. For installation of the check valve 32 is in the housing head 10 Mounting hole 36 provided. In the mounting hole 36 is a screw plug 35 screwed in for sealing serves.

Die Befestigung des Gehäusekopfes 10 auf dem Gehäusegrundkörper 1 erfolgt durch Schrauben 51, 52, die sich durch den Gehäusekopf 10 erstrecken und in Gewindesacklöcher 54, 55 in dem Gehäusegrundkörper 1 eingeschraubt werden. Zur Abdichtung des Kraftstoffabführkanals 38 ist zwischen den Gehäusekopf 10 und den Gehäusegrundkörper 1 ein Hochdruckdichtelement 58 eingepaßt.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. To seal the Fuel discharge channel 38 is between the housing head 10 and the housing base body 1 is a high-pressure sealing element 58 fitted.

Die niederdruckseitige Abdichtung des Verschlußelements 20 nach außen wird durch einen O-Ring erzielt.The sealing element 20 on the low-pressure side to the outside is achieved by an O-ring.

Claims (7)

  1. Radial piston pump for supplying high-pressure fuel in fuel injection systems of internal combustion engines, in particular in a common rail injection system, having a drive shaft (2), which is mounted in a pump housing (1, 10), and is of eccentric design or has cam-like projections in the peripheral direction, and having a plurality of pistons (5), which, with respect to the drive shaft, are arranged in a cylinder chamber (7) formed in a sleeve which is used to receive the piston (5), and which can be moved in a reciprocating manner in the respective cylinder chamber (7) as a result of the drive shaft (2) rotating, and having nonreturn valves (26, 32) on the suction side and the high-pressure side, the pump housing comprising a housing base body (1), in which the drive shaft (2) is mounted, and in each case one housing head (10) for each piston (5), the housing head (10) having a through-opening (9) which runs radially with respect to the drive shaft (2), and having a fuel-supply opening (15 and a fuel-discharge opening (38), the fuel-discharge opening (38) being arranged in the housing head (10), characterized in that the fuel-supply opening (15) is arranged in the housing head (10), in that the nonreturn valves (26, 32) on the suction side and the high-pressure side are arranged in the housing head (10), and in that the sleeve (8) is shrink-fitted into the housing head (10).
  2. Radial piston pump according to Claim 1, characterized in that the housing head (10) bears, by means of a planar bearing surface (60), against a planar bearing surface (61) of the housing base body (1).
  3. Radial piston pump according to one of the preceding claims, characterized in that the through-opening (9) has a section (11) of larger diameter for receiving the sleeve (8) and a section (12) of smaller diameter for receiving a closure element (20).
  4. Radial piston pump according to Claim 3, characterized in that the diameter of the section (12) of smaller diameter is larger than the internal diameter of the sleeve (8).
  5. Radial piston pump according to Claim 3 or 4, characterized in that a fuel-supply opening (22) is provided in the closure element (20), which opening has a seat (24) for the suction-side nonreturn valve (25, 26, 27) which is arranged in that end of the sleeve (8) which is remote from the drive shaft (2).
  6. Radial piston pump according to one of the preceding claims, characterized in that the sleeve (8) has a radial fuel-discharge bore (30), on the outer edge of which the high pressure-side nonreturn valve (34), which is arranged in the housing (10), comes to a stop.
  7. Radial piston pump according to one of the preceding claims, characterized in that all the sealing points of metallic components which are drawn onto one another and which are exposed to high pressure are formed without elastomeric sealing elements being arranged between them.
EP98966165A 1998-01-16 1998-11-25 Radial piston pump for high pressure fuel supply Expired - Lifetime EP1047876B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19801353 1998-01-16
DE19801353A DE19801353A1 (en) 1998-01-16 1998-01-16 Radial piston pump providing HP fuel for fuel injection systems of internal combustion engines, especially with common rail injection system
PCT/DE1998/003467 WO1999036698A1 (en) 1998-01-16 1998-11-25 Radial piston pump for high pressure fuel supply

Publications (2)

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

Family

ID=7854729

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Application Number Title Priority Date Filing Date
EP98966165A Expired - Lifetime EP1047876B1 (en) 1998-01-16 1998-11-25 Radial piston pump for high pressure fuel supply

Country Status (5)

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

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10239728A1 (en) * 2002-08-29 2004-03-11 Robert Bosch Gmbh Pump, in particular for a fuel injection device for an internal combustion engine
DE10322595B4 (en) * 2003-05-20 2013-02-28 Robert Bosch Gmbh Piston pump, and process for its preparation
GB0715982D0 (en) * 2007-08-15 2007-09-26 Itw Ltd Check valve
DE112008002627A5 (en) * 2007-10-15 2010-12-16 Ixetic Bad Homburg Gmbh Radial piston pump
US8047503B2 (en) * 2008-02-26 2011-11-01 Eaton Corporation Conical spring bushing
CN102027226B (en) * 2008-05-14 2014-04-02 株式会社小金井精机制作所 Diesel pump
IT1399872B1 (en) * 2010-05-17 2013-05-09 Magneti Marelli Spa FUEL PUMP FOR A DIRECT INJECTION SYSTEM
WO2015169621A1 (en) * 2014-05-05 2015-11-12 Robert Bosch Gmbh High-pressure pump for feeding fuel to an internal combustion engine
CN107110092B (en) * 2014-12-24 2020-05-05 罗伯特·博世有限公司 Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine

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 (en) * 1974-04-19 1976-05-21 Bennes Marrel Single piston pump for oil - has groove in eccentric forming passage to plunger and compression chamber
JPS635158A (en) * 1986-06-24 1988-01-11 Diesel Kiki Co Ltd Unit injector
IT1218675B (en) * 1987-08-25 1990-04-19 Weber Srl RADIAL PUMP PUMP IN PARTICULAR PUMP FOR INJECTION OF FUEL IN DIESEL CYCLE ENGINES
US5035221A (en) * 1989-01-11 1991-07-30 Martin Tiby M High pressure electronic common-rail fuel injection system for diesel engines
DE58903407D1 (en) * 1989-01-19 1993-03-11 Sulzer Ag LIFTING PISTON COMPRESSOR.
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 (en) * 1992-04-27 1996-05-23 Elasis Sistema Ricerca Fiat RADIAL PISTON PUMP, IN PARTICULAR FOR THE FUEL OF INTERNAL COMBUSTION ENGINES.
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 (en) * 1994-01-15 2007-01-18 Robert Bosch Gmbh Pump arrangement, in particular for conveying fuel from a reservoir to an internal combustion engine
DE19523283B4 (en) * 1995-06-27 2006-01-19 Robert Bosch Gmbh Pump, in particular high-pressure pump for a fuel injection device of an internal combustion engine
DE19530012A1 (en) * 1995-08-16 1997-02-20 Bosch Gmbh Robert Hydraulic housing block with a piston pump
DE19727249A1 (en) * 1996-07-01 1998-01-08 Rexroth Mannesmann Gmbh Device for stabilising eccentric ring of radial piston pump
US5865087A (en) * 1996-10-18 1999-02-02 Olson; Howard A. Rotary variable displacement fluid power device
DE29708906U1 (en) * 1997-05-21 1997-07-17 Lang Apparatebau Gmbh Piston diaphragm pump with sealless piston-cylinder unit

Also Published As

Publication number Publication date
JP2002509224A (en) 2002-03-26
DE59807345D1 (en) 2003-04-03
EP1047876A1 (en) 2000-11-02
DE19801353A1 (en) 1999-07-22
WO1999036698A1 (en) 1999-07-22
US6698399B1 (en) 2004-03-02

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