EP1058783A1 - Radial piston pump for supplying fuel at high pressure - Google Patents

Radial piston pump for supplying fuel at high pressure

Info

Publication number
EP1058783A1
EP1058783A1 EP98952547A EP98952547A EP1058783A1 EP 1058783 A1 EP1058783 A1 EP 1058783A1 EP 98952547 A EP98952547 A EP 98952547A EP 98952547 A EP98952547 A EP 98952547A EP 1058783 A1 EP1058783 A1 EP 1058783A1
Authority
EP
European Patent Office
Prior art keywords
piston pump
radial piston
pump according
high pressure
opening
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
EP98952547A
Other languages
German (de)
French (fr)
Other versions
EP1058783B1 (en
Inventor
Josef Güntert
Hansjörg Frey
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 EP1058783A1 publication Critical patent/EP1058783A1/en
Application granted granted Critical
Publication of EP1058783B1 publication Critical patent/EP1058783B1/en
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
    • F04B1/0448—Sealing means, e.g. for shafts or housings
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1002—Ball valves
    • F04B53/1007—Ball valves having means for guiding the closure member
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7922—Spring biased
    • Y10T137/7927—Ball valves
    • Y10T137/7928—With follower

Definitions

  • the invention relates to a radial piston pump for supplying high-pressure fuel in 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 designed eccentrically or has cam-like elevations in the circumferential direction, and preferably has a plurality of radially in one with respect to the drive shaft Pistons arranged in each cylinder space, which can be moved back and forth in the cylinder space when the drive shaft is turned, and with a suction-side and a high-pressure side spring-loaded check valve and with a component with a respective passage opening forming the cylinder space, one of the cylinder space
  • High-pressure delivery opening leads away, which opens into the sealing seat of the high-pressure check valve in an assembly opening of this component receiving the valve components.
  • Such a radial piston pump is by the Mannesmann Rexroth GmbH became known.
  • the assembly of the check valve on the high-pressure side is complicated since it comprises several components which have to be inserted into the assembly opening of the component forming the respective cylinder space.
  • the check valve is not accessible because the valve components are covered by a flange plate that holds the valve components in the assembly opening.
  • the high pressure seal is made using elastomer seals.
  • the object of the present invention is to improve a radial piston pump of the type mentioned in such a way that in the area of the high-pressure check valve, easier assembly and less expensive manufacture are achieved.
  • the preferably spherical valve body is first inserted into the preferably spherical valve body
  • the preassembled valve unit preferably has a closure element with an external thread, which can be screwed into an internal thread of the assembly opening.
  • the high-pressure seal is preferably achieved in that the closure element has an axial shoulder or end face on an axial step of the assembly opening support.
  • the sealing surface pairing of the closure element and the axial step in the assembly opening has a flat sealing surface on one part and a preferably sharp-edged, closed, circumferential elevation on the other part, which bring about a high-pressure seal when the components are tightened against one another.
  • a sealing plastic deformation occurs along the contact line between the flat and the sharp-edged sealing surface. It is therefore not necessary to use elastomeric sealing elements which are subject to aging and which, moreover, almost always prevent the components from being in contact with one another in a decoupled manner.
  • a high-pressure seal can be achieved by tightening the preassembled valve unit against the metallic component forming the assembly opening and also the cylinder space or spaces.
  • the valve unit comprises a cup-shaped loading element which can be displaced to a limited extent in the closing or opening direction and is biased in the closing direction and which, with the outside of its pot base, forces the valve body into contact with the sealing seat, forming a spring plate.
  • the valve body is preferably spherical
  • the outside of the pot base of the loading element preferably has a curvature corresponding to the spherical shape.
  • the cup-shaped loading element is dimensioned, preloaded and designed in its axial displaceability so that it can be placed against the valve body with the outside of its pot base during assembly of the valve unit and then slightly moved back towards the closure element until it reaches its sealing end position .
  • the preassembled valve unit preferably comprises a pin-shaped extension which engages in the cup-shaped loading element from the side facing away from the pot bottom and guides the loading element radially when it is axially displaced in the closing or opening direction.
  • Load element could be biased, for example, by a spiral spring provided around the pin-shaped extension in the closing direction, that is, in the direction of the sealing seat of the assembly opening.
  • the spiral spring could, for example, be supported against the closure element.
  • a spring is provided in the interior of the pot-shaped loading element and is supported at one end against the inside of the pot base and at the other end against an end face of the pin-shaped attachment. This results in a compact design of the preassembled valve unit.
  • the pin-shaped extension has a reduced-diameter axial section, which is preferably formed by a ring recess, and the cup-shaped loading element engages with a projection in this axial section.
  • the projection is formed by a crimping of the edge of the pot-shaped loading element facing the closure element.
  • the crimp can be in
  • the axial stop surface can preferably be formed by an end face of the closure element.
  • Figure 1 is a longitudinal sectional view of a radial piston pump according to the invention.
  • Figure 2 is a partial view of Figure 1 in an enlarged view.
  • Figures 1 and 2 show a radial piston pump
  • the radial piston pump comprises a drive shaft 4, which is mounted in a pump housing 2 and has an eccentrically designed shaft section 6.
  • An intermediate bush 8 is provided on the eccentric shaft section 6, with respect to which the shaft section 6 can be rotated.
  • the intermediate bush 8 comprises three flats 10, each offset by 120 °, against which a piston 12 is supported with a block-like contact section 14.
  • the pistons 12 are each slidably received in the radial direction in a cylinder space 18 formed by a solid metallic component 16 relative to the drive shaft 4.
  • a passage opening 20 is provided in the component 16 to form the cylinder space 18.
  • the through opening 20 is of stepped design and has a smaller diameter section 22 forming the actual cylinder space 18 and one diameter larger section 24.
  • a closure element 26 is inserted in a pressure-tight manner into the radially outer end of the through opening 20, that is to say into the larger-diameter section 24.
  • the closure element 26 is a closure screw 28 which is screwed into the larger-diameter section 24 of the through opening 20 with the interposition of a plate 30 to be described in more detail and an O-ring seal 32.
  • the plate 30 rests with a flat contact surface 34 on a flat collar-like surface 36.
  • the locking screw 28 has on its front side 38 facing the plate 30 a sharp-edged, closed, circumferential bead-shaped elevation 40, a so-called biting edge, which bears against the flat upper side of the plate 30.
  • the closure element 26 receives a check valve 42 on the suction side together with the plate 30.
  • the valve plate 30 comprises a central opening 44, through which a tappet 46 of a valve body 48 of the check valve 42 on the suction side extends.
  • the plunger 46 engages in a recess 50 in the locking screw 28 and has at its opposite end facing the piston a valve plate 52 which can be sealingly placed against a sealing seat 54 formed by the plate 30.
  • a collar bushing element 58 is applied to the plunger section 56 engaging in the recess 50.
  • a spring 62 is supported between the collar 60 of the collar bushing element 58 and the plate 30 and prestresses the plunger 46 in the direction of the recess 50 in the locking screw 28.
  • Fuel is supplied to the cylinder chamber 18 through a radial opening 64 in the plate 30, which in the Ram opening 44 opens.
  • the plunger 46 and thus the valve plate 52 are lifted from its sealing seat 54 as a result of the resulting negative pressure, and fuel is drawn into the cylinder chamber 18 via the opening 64.
  • Compression stroke of the piston 12 closes the intake-side check valve 42 and fuel under high pressure is supplied to the internal combustion engine via a radial bore 66 and a high-pressure side check valve designated overall by reference numeral 68 via a high-pressure delivery line 70 and a high-pressure connection (not shown).
  • the high-pressure check valve 68 is designed as follows:
  • an assembly opening 74 is provided which is radial to the longitudinal direction of the cylinder space 18.
  • the aforementioned bore 66 opens into the mounting opening 74, which is conical in the area of the mouth and forms a valve seat 76 there for a spherical valve body 78 of the check valve 68.
  • the conical section widens up to a cylindrical section 80 with a first diameter, which merges via an axial step 82 into an enlarged end section 84 with an internal thread 86.
  • a preassembled valve unit 88 can be inserted into this mounting opening 74.
  • the valve unit 88 comprises a closure element 90 in the form of a closure screw, which can be screwed into the internal thread 86 with an external thread 92.
  • a pin-shaped extension 96 protrudes from the inwardly facing end face 94 of the closure element 90.
  • the pin-shaped extension 96 engages in a cup-shaped loading element 98.
  • a pressure spring 104 is supported between a pot bottom 100 and an end face 102 of the pin-shaped projection 96, which pressure spring moves the pot-shaped loading element 98 in the direction of the valve body 78 preloaded.
  • the load element 98 can thus be displaced in the floating position by the pin-shaped extension 96 in the actuating direction 106 of the valve and is guided in the radial direction by the pin-shaped extension. Due to the play of this floating bearing, manufacturing tolerances can be compensated.
  • the pin-shaped extension 96 has in the area of the peripheral edge 108 of the loading element 98 a reduced-diameter axial section 110 in the form of a ring recess.
  • the cup-shaped loading element 98 engages in this ring recess with a crimped edge section 112. This prevents the pot-shaped loading element 98 from detaching from the pin-shaped projection 96 under the pretension of the spring 104.
  • the flanged edge section 112 bears against a flank 114 of the reduced-diameter axial section 110.
  • Another non-flanged edge section 116 of the pot-shaped loading element 98 can be placed with its end face 118 against an axial stop region 120 of the closure element 90.
  • the closure element 90 has, corresponding to the closure element 26, a circumferential sharp-edged bead-shaped elevation 122 on its end face 94, which is tightened to form a biting edge against the axial step 82 of the assembly opening 74, as a result of which a high-pressure seal is achieved.
  • valve body 78 is lifted from its sealing seat 76 against the force of the spring 104 transmitted via the loading element 98, and fuel under high pressure is passed through the bore 66, past the valve body 78 and the outside of the pot-shaped loading element 98 conveyed into the fuel delivery opening 70 to the high pressure connection.

Landscapes

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

Abstract

The invention relates to a radial piston pump for supplying fuel at high pressure in fuel injection systems of internal combustion engines, especially in a common rail injection system, comprising a drive shaft (4) mounted in a pump housing (2), said drive shaft being configured excentrically or having several cam-like elevations in the peripheral direction, and preferably several pistons (12). Said pistons (12) are each arranged in a cylindrical chamber (18), radially in relation to the drive shaft (4), and move back and forth in this cylindrical chamber (18) when the drive shaft (4) rotates. The inventive radial piston pump also has one admission side return valve and one high pressure side return valve (42, 68), said valves being prestressed with a spring, and a structural member (16) whose inner width (20) forms the cylindrical chamber (18). A high pressure delivery opening (66) leads away from the cylindrical chamber (18) and joins an assembly opening (74) of the structural member (16) in the seat (76) of the high pressure side return valve (68). Said assembly opening (74) accommodates the valve components. With the exception of the valve body (78) which rests against the seat (76), the high pressure return valve (68) can be fitted in the assembly opening as a preassembled unit (88) to facilitate the assembly in this area. The high pressure return valve (68) can then be tightened against the structural member (16), forming a high pressure seal.

Description

Radialkolbenpumpe zur KraftstoffhochdruckversorgunqRadial piston pump for high-pressure fuel supply
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 vorzugsweise mehreren bezüglich der Antriebswelle radial in einem jeweiligen Zylinderraum angeordneten Kolben, die bei Umdrehen der Antriebswelle in dem Zylinderraum hin- und her bewegbar sind, und mit einem ansaugseitigen und einem hochdruckseitigen federvorgespannten Rückschlagventil und mit einem Bauteil mit einer jeweiligen den Zylinderraum bildenden Durchgangsöffnung, wobei vom Zylinderraum eineThe invention relates to a radial piston pump for supplying high-pressure fuel in 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 designed eccentrically or has cam-like elevations in the circumferential direction, and preferably has a plurality of radially in one with respect to the drive shaft Pistons arranged in each cylinder space, which can be moved back and forth in the cylinder space when the drive shaft is turned, and with a suction-side and a high-pressure side spring-loaded check valve and with a component with a respective passage opening forming the cylinder space, one of the cylinder space
Hochdruckförderöffnung wegführt, welche im Dichtsitz des hochdruckseitigen Rückschlagventils in einer die Ventilkomponenten aufnehmenden Montageöffnung dieses Bauteils mündet .High-pressure delivery opening leads away, which opens into the sealing seat of the high-pressure check valve in an assembly opening of this component receiving the valve components.
Eine derartige Radialkolbenpumpe ist durch die Mannesmann- Rexroth GmbH bekannt geworden. Die Montage des hochdruckseitigen Rückschlagventils ist kompliziert, da dieses mehrere Bauteile umfasst, die in die Montageöffnung des den jeweiligen Zylinderraum bildenden Bauteils eingesetzt werden müssen. Das Rückschlagventil ist nicht zugänglich, da die Ventilkomponenten von einer Flanschplatte abgedeckt sind, welche die Ventilkomponenten in der Montageöffnung hält. Die Hochdruckabdichtung ist unter Verwendung von Elastomerdichtungen ausgeführt .Such a radial piston pump is by the Mannesmann Rexroth GmbH became known. The assembly of the check valve on the high-pressure side is complicated since it comprises several components which have to be inserted into the assembly opening of the component forming the respective cylinder space. The check valve is not accessible because the valve components are covered by a flange plate that holds the valve components in the assembly opening. The high pressure seal is made using elastomer seals.
Hiervon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Radialkolbenpumpe der genannten Art so zu verbessern, dass im Bereich des hochdruckseitigen Rückschlagventils eine erleichterte Montage und kostengünstigere Herstellbarkeit erreicht wird.Proceeding from this, the object of the present invention is to improve a radial piston pump of the type mentioned in such a way that in the area of the high-pressure check valve, easier assembly and less expensive manufacture are achieved.
Diese Aufgabe wird bei einer Radialkolbenpumpe der gattungsgemäßen Art erfindungsgemäß dadurch gelöst, dass das hochdruckseitige Rückschlagventil mit Ausnahme eines gegen den Dichtsitz anlegbaren Ventilkörpers als vormontierte Einheit in die Montageöffnung einsetzbar ist und unter Ausbildung einer Hochdruckabdichtung gegen das Bauteil festziehbar ist.This object is achieved according to the invention in a radial piston pump of the generic type in that the high-pressure check valve, with the exception of a valve body which can be placed against the sealing seat, can be used as a preassembled unit in the assembly opening and can be tightened against the component with the formation of a high-pressure seal.
Zur Montage des hochdruckseitigen Rückschlagventils wird also zuerst der vorzugsweise kugelförmige Ventilkörper in dieTo assemble the high-pressure check valve, the preferably spherical valve body is first inserted into the
Montageöffnung eingebracht. Durch eine vorzugsweise konische Ausbildung der Montageöffnung im Bereich des Dichtsitzes lässt sich bei der Montage gewährleisten, dass der Ventilkörper seine bestimmungsgemäße Position einnimmt. Es wird dann die vormontierte Ventileinheit eingesetzt und gegen das Bauteil festgezogen. Hierfür weist die vormontierte Ventileinheit vorzugsweise ein Verschlusselement mit einem Außengewinde auf, das in ein Innengewinde der Montageöffnung einschraubbar ist.Installation opening introduced. A preferably conical design of the assembly opening in the area of the sealing seat ensures during assembly that the valve body assumes its intended position. The pre-assembled valve unit is then inserted and tightened against the component. For this purpose, the preassembled valve unit preferably has a closure element with an external thread, which can be screwed into an internal thread of the assembly opening.
Die Hochdruckabdichtung wird vorzugsweise dadurch erreicht, dass sich das Verschlusselement mit einer axialen Schulter oder Stirnseite an einer axialen Stufe der Montageöffnung abstütz .The high-pressure seal is preferably achieved in that the closure element has an axial shoulder or end face on an axial step of the assembly opening support.
Bei einer ganz besonders vorteilhaften Ausführungsform der Erfindung weist die Dichtflächenpaarung von Verschlusselement und axialer Stufe in der Montageöffnung eine plane Dichtfläche an dem einen Teil und eine vorzugsweise scharfkantige geschlossen umlaufende Erhebung an dem anderen Teil auf, die beim Festziehen der Bauteile gegeneinander eine Hochdruckabdichtung bewirken. Hierbei stellt sich beim Verspannen der Bauteile gegeneinander eine dichtende plastische Verformung entlang der Berührungslinie der planen und der scharfkantigen Dichtfläche ein. Es brauchen also keine elastomeren der Alterung unterliegenden Dichtelemente verwendet zu werden, die zudem nahezu stets eine voneinander entkoppelte definierte Anlage der Bauteile aneinander verhindern. Es lässt sich eine Hochdruckabdichtung erreichen, indem die vormontierbare Ventileinheit gegen das die Montageöffnung und auch den oder die Zylinderräume bildende metallische Bauteil angezogen wird.In a very particularly advantageous embodiment of the invention, the sealing surface pairing of the closure element and the axial step in the assembly opening has a flat sealing surface on one part and a preferably sharp-edged, closed, circumferential elevation on the other part, which bring about a high-pressure seal when the components are tightened against one another. Here, when the components are braced against each other, a sealing plastic deformation occurs along the contact line between the flat and the sharp-edged sealing surface. It is therefore not necessary to use elastomeric sealing elements which are subject to aging and which, moreover, almost always prevent the components from being in contact with one another in a decoupled manner. A high-pressure seal can be achieved by tightening the preassembled valve unit against the metallic component forming the assembly opening and also the cylinder space or spaces.
In bevorzugter Ausbildung des hochdruckseitigen Rückschlagventils umfasst die Ventileinheit ein topfförmiges in Schließ- bzw. Öffnungsrichtung begrenzt verschiebliches und in Schließrichtung vorgespanntes Belastungselement, welches mit der Außenseite seines Topfbodens einen Federteller bildend den Ventilkörper in Anlage an den Dichtsitz zwingt. Wenn der Ventilkörper in bevorzugter Weise kugelförmig ausgebildet ist, so weist die Außenseite des Topfbodens des Belastungselements vorzugsweise eine der Kugelform entsprechende Wölbung auf.In a preferred embodiment of the non-return valve on the high-pressure side, the valve unit comprises a cup-shaped loading element which can be displaced to a limited extent in the closing or opening direction and is biased in the closing direction and which, with the outside of its pot base, forces the valve body into contact with the sealing seat, forming a spring plate. If the valve body is preferably spherical, the outside of the pot base of the loading element preferably has a curvature corresponding to the spherical shape.
Das topfförmige Belastungselement ist dabei derart bemessen, vorgespannt und in seiner axialen Verschieblichkeit ausgebildet, dass er bei der Montage der Ventileinheit mit der Außenseite seines Topfbodens gegen den Ventilkörper anlegbar und dann geringfügig in Richtung auf das Verschlusselement zurückbewegbar ist, bis dieses seine dichtende Endstellung erreicht ha . Die vormontierte Ventileinheit umfasst vorzugsweise einen stiftförmigen Ansatz, der von der vom Topfboden abgewandten Seite in das topfförmige Belastungselement eingreift und das Belastungselement bei seiner axialen Verlagerung in Schließ- bzw. Öffnungsrichtung radial führt. Das topfförmigeThe cup-shaped loading element is dimensioned, preloaded and designed in its axial displaceability so that it can be placed against the valve body with the outside of its pot base during assembly of the valve unit and then slightly moved back towards the closure element until it reaches its sealing end position . The preassembled valve unit preferably comprises a pin-shaped extension which engages in the cup-shaped loading element from the side facing away from the pot bottom and guides the loading element radially when it is axially displaced in the closing or opening direction. The pot-shaped
Belastungselement könnte beispielsweise durch eine um den stif förmigen Ansatz herum vorgesehene Spiralfeder in Schließrichtung, also in Richtung auf den Dichtsitz der Montageöffnung vorgespannt werden. Die Spiralfeder könnte sich hierbei beispielsweise gegen das Verschlusselement abstützen. Indessen erweist es sich als vorteilhaft, wenn eine Feder im Inneren des topfformigen Belastungselements vorgesehen ist und sich einenends gegen die Innenseite des Topfbodens und anderenends gegen eine Stirnseite des stiftförmigen Ansatzes abstützt. Hierdurch wird eine kompakte Bauform der vormontierten Ventileinheit erreicht.Load element could be biased, for example, by a spiral spring provided around the pin-shaped extension in the closing direction, that is, in the direction of the sealing seat of the assembly opening. The spiral spring could, for example, be supported against the closure element. However, it proves to be advantageous if a spring is provided in the interior of the pot-shaped loading element and is supported at one end against the inside of the pot base and at the other end against an end face of the pin-shaped attachment. This results in a compact design of the preassembled valve unit.
Um zu verhindern, dass das topfförmige Belastungselement sich unter der Vorspannung der Feder von der Ventileinheit löst, ist das topfförmige Belastungselement über ein axiales Anschlagmittel blockiert. Nach einer bevorzugten Ausführungsform der vormontierbaren Ventileinheit weist der stiftförmige Ansatz einen durchmesserverringerten Axialabschnitt auf, der vorzugsweise von einem Ringeinstich gebildet ist, und das topfförmige Belastungselement greift mit einem Vorsprung in diesen Axialabschnitt ein. Durch Anlage des Vorsprungs an eine axiale Stufe des Ansatzes, welche den durchmesserverringernden Axialabschnitt begrenzt, wird verhindert, dass sich das topfförmige Belastungselement von dem stiftförmigen Ansatz lösen kann.In order to prevent the pot-shaped loading element from coming loose from the valve unit under the pretension of the spring, the pot-shaped loading element is blocked by an axial stop means. According to a preferred embodiment of the preassembled valve unit, the pin-shaped extension has a reduced-diameter axial section, which is preferably formed by a ring recess, and the cup-shaped loading element engages with a projection in this axial section. By contacting the projection against an axial step of the extension, which delimits the diameter-reducing axial section, it is prevented that the cup-shaped loading element can become detached from the pin-shaped extension.
Nach einer bevorzugten Weiterbildung des Erfindungsgedankens ist der Vorsprung von einer Einbördelung des dem Verschlusselement zugewandten Randes des topfformigen Belastungselements gebildet. Die Einbördelung kann inAccording to a preferred development of the inventive concept, the projection is formed by a crimping of the edge of the pot-shaped loading element facing the closure element. The crimp can be in
Umfangsrichtung durchgehend ausgebildet sein. Es erweist sich jedoch als vorteilhaft, wenn in Umfangsrichtung des Randes nur ein oder mehrere Teilabschnitte eingebördelt sind, so dass ein nicht eingebördelter Randabschnitt des topfformigen Belastungselements zur Ausbildung einer Hubbegrenzung an eine axiale Anschlagsfläche anlegbar ist . Die axiale Anschlagsfläche kann vorzugsweise von einer Stirnseite des Verschlusselements gebildet werden.Continuous circumferential direction. However, it proves to be advantageous if only in the peripheral direction of the edge one or more partial sections are crimped, so that a non-crimped edge section of the pot-shaped load element can be placed against an axial stop surface to form a stroke limitation. The axial stop surface can preferably be formed by an end face of the closure element.
Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus der zeichnerischen Darstellung und nachfolgenden Beschreibung einer bevorzugten Ausführungsform der erfindungsgemäßen Radialkolbenpumpe. In der Zeichnung zeigt :Further features, details and advantages of the invention result from the drawing and the following description of a preferred embodiment of the radial piston pump according to the invention. The drawing shows:
Figur 1 eine Längsschnittansicht einer Radialkolbenpumpe nach der Erfindung; undFigure 1 is a longitudinal sectional view of a radial piston pump according to the invention; and
Figur 2 eine Teilansicht aus Figur 1 in vergrößerter Darstellung.Figure 2 is a partial view of Figure 1 in an enlarged view.
Die Figuren 1 und 2 zeigen eine Radialkolbenpumpe zurFigures 1 and 2 show a radial piston pump
Kraftstoffhochdruckversorgung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen. Die Radialkolbenpumpe umfasst eine in einem Pumpengehäuse 2 gelagerte Antriebswelle 4 mit einem exzentrisch ausgebildeten Wellenabschnitt 6. Auf dem exzentrischen Wellenabschnitt 6 ist eine Zwischenbuchse 8 vorgesehen, gegenüber welcher der Wellenabschnitt 6 drehbar ist. Die Zwischenbuchse 8 umfasst drei jeweils um 120° zueinander versetzte Abflachungen 10, gegen die sich jeweils ein Kolben 12 mit einem blockartigen Anlageabschnitt 14 abstützt. Die Kolben 12 sind in jeweils einem von einem massiven metallischen Bauteil 16 gebildeten Zylinderraum 18 zur Antriebswelle 4 in radialer Richtung verschieblich aufgenommen. Zur Bildung des Zylinderraums 18 ist in dem Bauteil 16 eine Durchgangsöffnung 20 vorgesehen. Die Durchgangsöffnung 20 ist gestuft ausgebildet und weist einen den eigentlichen Zylinderraum 18 bildenden durchmesserkleineren Abschnitt 22 und einen durchmessergrößeren Abschnitt 24 auf. In das radial äußere Ende der Durchgangsöffnung 20, also in den durchmessergrößeren Abschnitt 24, ist ein Verschlusselement 26 druckdicht eingesetzt. Das Verschlusselement 26 ist eine Verschlussschraube 28, die unter Zwischenordnung einer noch näher zu beschreibenden Platte 30 und einer O-Ring-Dichtung 32 in den durchmessergrößeren Abschnitt 24 der Durchgangsöffnung 20 eingeschraubt ist. Die Platte 30 liegt mit einer ebenen Anlagefläche 34 auf einer ebenen ringbundartigen Fläche 36 auf. Die Verschlussschraube 28 weist auf ihrer der Platte 30 zugewandten Stirnseite 38 eine scharfkantige geschlossen umlaufende sickenförmige Erhebung 40, eine sogenannte Beißkante, auf, welche gegen die ebene Oberseite der Platte 30 anliegt. Wenn die Verschlussschraube 28 in das Gewinde des durchmessergrößeren Abschnitts 24 eingeschraubt wird, so wird unter geringfügiger plastischer Verformung entlang der Berührungslinie der sickenförmigen Erhebung 40 und der Platte 30 sowie im Bereich der gegeneinander anliegenden Flächen 34, 36 eine Hochdruckabdichtung bewirkt.High-pressure fuel supply in fuel injection systems of internal combustion engines. The radial piston pump comprises a drive shaft 4, which is mounted in a pump housing 2 and has an eccentrically designed shaft section 6. An intermediate bush 8 is provided on the eccentric shaft section 6, with respect to which the shaft section 6 can be rotated. The intermediate bush 8 comprises three flats 10, each offset by 120 °, against which a piston 12 is supported with a block-like contact section 14. The pistons 12 are each slidably received in the radial direction in a cylinder space 18 formed by a solid metallic component 16 relative to the drive shaft 4. A passage opening 20 is provided in the component 16 to form the cylinder space 18. The through opening 20 is of stepped design and has a smaller diameter section 22 forming the actual cylinder space 18 and one diameter larger section 24. A closure element 26 is inserted in a pressure-tight manner into the radially outer end of the through opening 20, that is to say into the larger-diameter section 24. The closure element 26 is a closure screw 28 which is screwed into the larger-diameter section 24 of the through opening 20 with the interposition of a plate 30 to be described in more detail and an O-ring seal 32. The plate 30 rests with a flat contact surface 34 on a flat collar-like surface 36. The locking screw 28 has on its front side 38 facing the plate 30 a sharp-edged, closed, circumferential bead-shaped elevation 40, a so-called biting edge, which bears against the flat upper side of the plate 30. If the screw plug 28 is screwed into the thread of the larger-diameter section 24, a high-pressure seal is brought about with slight plastic deformation along the line of contact of the bead-shaped elevation 40 and the plate 30 and in the region of the surfaces 34, 36 lying against one another.
Das Verschlusselement 26 nimmt zusammen mit der Platte 30 ein ansaugseitiges Rückschlagventil 42 auf. Die Ventilplatte 30 umfasst eine zentrale Öffnung 44, durch die ein Stössel 46 eines Ventilkörpers 48 des ansaugseitigen Rückschlagventils 42 hindurchgreift. Der Stössel 46 greift in eine Ausnehmung 50 in der Verschlussschraube 28 ein und weist an seinem gegenüberliegenden kolbenzugewandten Ende einen Ventilteller 52 auf, der gegen einen von der Platte 30 gebildeten Dichtsitz 54 dichtend anlegbar ist.The closure element 26 receives a check valve 42 on the suction side together with the plate 30. The valve plate 30 comprises a central opening 44, through which a tappet 46 of a valve body 48 of the check valve 42 on the suction side extends. The plunger 46 engages in a recess 50 in the locking screw 28 and has at its opposite end facing the piston a valve plate 52 which can be sealingly placed against a sealing seat 54 formed by the plate 30.
Auf den in die Ausnehmung 50 eingreifenden Stösselabschnitt 56 ist ein Bundbuchsenelement 58 aufgebracht. Zwischen dem Bund 60 des Bundbuchsenelements 58 und der Platte 30 stützt sich eine Feder 62 ab und spannt den Stössel 46 in Richtung auf die Ausnehmung 50 in der Verschlussschraube 28 vor. DieA collar bushing element 58 is applied to the plunger section 56 engaging in the recess 50. A spring 62 is supported between the collar 60 of the collar bushing element 58 and the plate 30 and prestresses the plunger 46 in the direction of the recess 50 in the locking screw 28. The
KraftstoffZuführung zum Zylinderraum 18 erfolgt durch eine radiale Öffnung 64 in der Platte 30, welche in der der Stösselöffnung 44 mündet. Wenn der Kolben 12 nach unten bewegt wird, so wird in Folge des entstehenden Unterdrucks der Stössel 46 und damit der Ventilteller 52 von seinem Dichtsitz 54 abgehoben, und es wird Kraftstoff über die Öffnung 64 in den Zylinderraum 18 angesaugt. Beim anschließendenFuel is supplied to the cylinder chamber 18 through a radial opening 64 in the plate 30, which in the Ram opening 44 opens. When the piston 12 is moved downward, the plunger 46 and thus the valve plate 52 are lifted from its sealing seat 54 as a result of the resulting negative pressure, and fuel is drawn into the cylinder chamber 18 via the opening 64. At the subsequent
Verdichtungshub des Kolbens 12 schließt das ansaugseitige Rückschlagventil 42 und unter Hochdruck stehender Kraftstoff wird über eine radiale Bohrung 66 und ein insgesamt mit dem Bezugszeichen 68 bezeichnetes hochdruckseitiges Rückschlagventil über eine Hochdruckförderleitung 70 und einen nicht dargestellten Hochdruckanschluss der Brennkraftmaschine zugeführt .Compression stroke of the piston 12 closes the intake-side check valve 42 and fuel under high pressure is supplied to the internal combustion engine via a radial bore 66 and a high-pressure side check valve designated overall by reference numeral 68 via a high-pressure delivery line 70 and a high-pressure connection (not shown).
Das hochdruckseitige Rückschlagventil 68 ist wie folgt ausgebildet :The high-pressure check valve 68 is designed as follows:
In das metallische Bauteil 60, welches auch den Zylinderraum 18 definiert, ist eine zur Längsrichtung des Zylinderraums 18 radiale Montageöffnung 74 vorgesehen. Die vorstehend erwähnte Bohrung 66 mündet in der Montageöffnung 74, die im Bereich der Mündung konisch verläuft und dort einen Ventilsitz 76 für einen kugelförmigen Ventilkörper 78 des Rückschlagventils 68 bildet. Der konische Abschnitt erweitert sich bis zu einem zylindrischen Abschnitt 80 mit einem ersten Durchmesser, der über eine axiale Stufe 82 in einen erweiterten Endabschnitt 84 mit einem Innengewinde 86 übergeht.In the metallic component 60, which also defines the cylinder space 18, an assembly opening 74 is provided which is radial to the longitudinal direction of the cylinder space 18. The aforementioned bore 66 opens into the mounting opening 74, which is conical in the area of the mouth and forms a valve seat 76 there for a spherical valve body 78 of the check valve 68. The conical section widens up to a cylindrical section 80 with a first diameter, which merges via an axial step 82 into an enlarged end section 84 with an internal thread 86.
In diese Montageöffnung 74 ist eine vormontierbare Ventileinheit 88 einsetzbar. Die Ventileinheit 88 umfasst ein Verschlusselement 90 in Form einer Verschlussschraube, die mit einem Außengewinde 92 in das Innengewinde 86 einschraubbar ist . Von der nach Innen gewandten Stirnseite 94 des Verschlusselements 90 steht ein stiftförmiger Ansatz 96 vor. Der stiftförmige Ansatz 96 greift in ein topfförmiges Belastungselement 98 ein. Zwischen einem Topfboden 100 und einer Stirnseite 102 des stiftförmigen Ansatzes 96 ist eine Druckfeder 104 abgestützt, welche das topfförmige Belastungselement 98 in Richtung auf den Ventilkörper 78 vorspannt. Das Belastungselement 98 ist also in schwimmender Lagerung durch den stiftförmigen Ansatz 96 in Stellrichtung 106 des Ventils verschieblich und wird dabei von dem stiftförmigen Ansatz in radialer Richtung geführt. Durch das Spiel dieser schwimmenden Lagerung können Fertigungstoleranzen ausgeglichen werden.A preassembled valve unit 88 can be inserted into this mounting opening 74. The valve unit 88 comprises a closure element 90 in the form of a closure screw, which can be screwed into the internal thread 86 with an external thread 92. A pin-shaped extension 96 protrudes from the inwardly facing end face 94 of the closure element 90. The pin-shaped extension 96 engages in a cup-shaped loading element 98. A pressure spring 104 is supported between a pot bottom 100 and an end face 102 of the pin-shaped projection 96, which pressure spring moves the pot-shaped loading element 98 in the direction of the valve body 78 preloaded. The load element 98 can thus be displaced in the floating position by the pin-shaped extension 96 in the actuating direction 106 of the valve and is guided in the radial direction by the pin-shaped extension. Due to the play of this floating bearing, manufacturing tolerances can be compensated.
Der stiftförmige Ansatz 96 weist im Bereich des umlaufenden Randes 108 des Belastungselements 98 einen durchmesserverringerten Axialabschnitt 110 in Form eines Ringeinstichs auf. In diesen Ringeinstich greift das topfförmige Belastungselement 98 mit einem eingebördelten Randabschnitt 112 ein. Hierdurch wird verhindert, dass sich das topfförmige Belastungselement 98 unter der Vorspannung der Feder 104 von dem stiftförmigen Ansatz 96 löst. Im nicht eingebauten Zustand der Ventileinheit 88 liegt der eingebördelte Randabschnitt 112 gegen eine Flanke 114 des durchmesserverringerten Axialabschnitts 110 an. Ein anderer nicht eingebördelter Randabschnitt 116 des topfformigen Belastungselements 98 ist mit seiner Stirnseite 118 gegen einen axialen Anschlagsbereich 120 des Verschlusselements 90 anlegbar .The pin-shaped extension 96 has in the area of the peripheral edge 108 of the loading element 98 a reduced-diameter axial section 110 in the form of a ring recess. The cup-shaped loading element 98 engages in this ring recess with a crimped edge section 112. This prevents the pot-shaped loading element 98 from detaching from the pin-shaped projection 96 under the pretension of the spring 104. When the valve unit 88 is not installed, the flanged edge section 112 bears against a flank 114 of the reduced-diameter axial section 110. Another non-flanged edge section 116 of the pot-shaped loading element 98 can be placed with its end face 118 against an axial stop region 120 of the closure element 90.
Das Verschlusselement 90 weist entsprechend dem Verschlusselement 26 an seiner Stirnseite 94 eine umlaufende scharfkantige sickenförmige Erhebung 122 auf, welche gegen die axiale Stufe 82 der Montageöffnung 74 eine Beißkante bildend festgezogen wird, wodurch eine Hochdruckabdichtung erreicht wird.The closure element 90 has, corresponding to the closure element 26, a circumferential sharp-edged bead-shaped elevation 122 on its end face 94, which is tightened to form a biting edge against the axial step 82 of the assembly opening 74, as a result of which a high-pressure seal is achieved.
Beim Verdichtungshub des Kolbens 12 wird der Ventilkörper 78 entgegen der über das Belastungselement 98 übertragenen Kraft der Feder 104 von seinem Dichtsitz 76 abgehoben, und unter Hochdruck stehender Kraftstoff wird durch die Bohrung 66 hindurch, an dem Ventilkörper 78 und der Außenseite des topfformigen Belastungselements 98 vorbei in die Kraftstoffförderöffnung 70 zum Hochdruckanschluss gefördert. During the compression stroke of the piston 12, the valve body 78 is lifted from its sealing seat 76 against the force of the spring 104 transmitted via the loading element 98, and fuel under high pressure is passed through the bore 66, past the valve body 78 and the outside of the pot-shaped loading element 98 conveyed into the fuel delivery opening 70 to the high pressure connection.

Claims

Ansprüche Expectations
1. Radialkolbenpumpe zur Kraftstoffhochdruckversorgung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere bei einem Common-Rail-Einspritzsystem, mit einer in einem Pumpengehäuse (2) gelagerten Antriebswelle (4) , die exzentrisch ausgebildet ist oder in Umfangsrichtung mehrere nockenartige Erhebungen aufweist, und mit vorzugsweise mehreren bezüglich der Antriebswelle (4) radial in einem jeweiligen Zylinderraum (18) angeordneten Kolben (12) , die bei Umdrehen der1. Radial piston pump for high-pressure fuel supply in fuel injection systems of internal combustion engines, in particular in a common rail injection system, with a drive shaft (4) mounted in a pump housing (2), which is eccentrically formed or has a plurality of cam-like elevations in the circumferential direction, and preferably several the drive shaft (4) arranged radially in a respective cylinder space (18) piston (12), which when turning the
Antriebswelle (4) in dem Zylinderraum (18) hin- und her bewegbar sind, und mit einem ansaugseitigen und einem hochdruckseitigen federvorgespannten Rückschlagventil (42, 68) und mit einem Bauteil (16) mit einer den Zylinderraum (18) bildenden Durchgangsöffnung (20) , wobei vom Zylinderraum (18) eine Hochdruckförderöffnung (66) wegführt, welche im Dichtsitz (76) des hochdruckseitigen Rückschlagventils (68) in einer die Ventilkomponenten aufnehmenden Montageöffnung (74) dieses Bauteils (16) mündet, dadurch gekennzeichnet, dass das hochdruckseitige Rückschlagventil (68) mit Ausnahme eines gegen den Dichtsitz (76) anlegbaren Ventilkörpers (78) als vormontierte Einheit (88) in die Montageöffnung (74) einsetzbar ist und unter Ausbildung einer Hochdruckabdichtung gegen das Bauteil (16) festziehbar ist . Drive shaft (4) can be moved back and forth in the cylinder space (18), and has a check valve (42, 68) on the suction side and a high-pressure side on the spring side and with a component (16) with a passage opening (20) forming the cylinder space (18) , A high-pressure delivery opening (66) leading away from the cylinder space (18), which opens into the sealing seat (76) of the high-pressure check valve (68) in an assembly opening (74) of this component (16) that receives the valve components, characterized in that the high-pressure check valve ( 68), with the exception of a valve body (78) that can be placed against the sealing seat (76), can be inserted into the assembly opening (74) as a preassembled unit (88) and can be tightened against the component (16) while forming a high-pressure seal.
2. Radialkolbenpumpe nach Anspruch 1, dadurch gekennzeichnet, dass die vormontierte Ventileinheit (88) ein Verschlußelement (90) mit einem Außengewinde (92) aufweist, das in ein Innengewinde (86) der Montageöffnung (74) einschraubbar ist.2. Radial piston pump according to claim 1, characterized in that the preassembled valve unit (88) has a closure element (90) with an external thread (92) which can be screwed into an internal thread (86) of the mounting opening (74).
3. Radialkolbenpumpe nach Anspruch 2, dadurch gekennzeichnet, dass sich das Verschlußelement (90) mit einer axialen Schulter oder Stirnseite (94) an einer axialen Stufe (82) der Montageδffnung (74) abstützt und dadurch die Hochdruckabdichtung bewirkt .3. Radial piston pump according to claim 2, characterized in that the closure element (90) with an axial shoulder or end face (94) is supported on an axial step (82) of the assembly opening (74) and thereby brings about the high-pressure seal.
4. Radialkolbenpumpe nach Anspruch 3 , dadurch gekennzeichnet, dass die Dichtflächenpaarung von Verschlußelement (90) und axialer Stufe (82) in der4. Radial piston pump according to claim 3, characterized in that the sealing surface pairing of the closure element (90) and the axial step (82) in the
Montageöffnung (74) eine plane Dichtfläche an dem einen Teil und eine kantige geschlossen umlaufende Erhebung (122) an dem anderen Bauteil aufweisen, die beim Festziehen der Bauteile gegeneinander eine Hochdruckabdichtung bewirken.Mounting opening (74) have a flat sealing surface on one part and an angular closed circumferential elevation (122) on the other component, which cause a high pressure seal against each other when tightening the components.
5. Radialkolbenpumpe nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Ventileinheit (88) ein topfförmiges in Schließ- bzw- Öffnungsrichtung begrenzt verschiebliches und in5. Radial piston pump according to one or more of the preceding claims, characterized in that the valve unit (88) is a pot-shaped in the closing or opening direction limited and displaceable in
Schließrichtung vorgespanntes Belastungselement (98) umfasst, welches mit der Außenseite seines Topfbodens (100) den Ventilkörper (78) in Anlage an den Dichtsitz (76) zwingt.Closing direction includes a prestressed loading element (98) which, with the outside of its pot base (100), forces the valve body (78) into contact with the sealing seat (76).
6. Radialkolbenpumpe nach Anspruch 5, dadurch gekennzeichnet, dass der Ventilkörper (76) kugelförmig ist und die Außenseite des Topfbodens (100) eine der Kugelform entsprechende Wölbung aufweist.6. Radial piston pump according to claim 5, characterized in that the valve body (76) is spherical and the outside of the pot base (100) has a curvature corresponding to the spherical shape.
7. Radialkolbenpumpe nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass von dem Verschlußelement (90) ein stiftförmiger Ansatz (96) von der vom Topfboden (100) abgewandten Seite in das Belastungselement (98) eingreift .7. Radial piston pump according to claim 5 or 6, characterized in that one of the closure element (90) pin-shaped projection (96) engages in the loading element (98) from the side facing away from the pot base (100).
8. Radialkolbenpumpe nach Anspruch 7, dadurch gekennzeichnet, dass der stiftförmige Ansatz (96) einen durchmesserverringerten Axialabschnitt (110) aufweist und dass das topfförmige Belastungselement (98) mit einem Vorsprung in diesen Axialabschnitt eingreift.8. Radial piston pump according to claim 7, characterized in that the pin-shaped projection (96) has a reduced-diameter axial section (110) and that the cup-shaped loading element (98) engages with a projection in this axial section.
9. Radialkolbenpumpe nach Anspruch 8 , dadurch gekennzeichnet, dass der Vorsprung von einer Einbördelung des dem Verschlußelement (90) zugewandten Randes (108) des topfformigen Belastungselements (98) gebildet ist.9. Radial piston pump according to claim 8, characterized in that the projection is formed by a crimping of the closure element (90) facing edge (108) of the pot-shaped loading element (98).
10. Radialkolbenpumpe nach Anspruch 9, dadurch gekennzeichnet, dass in Umfangsrichtung des Randes nur ein oder mehrere Teilabschnitte (112) eingebördelt sind.10. Radial piston pump according to claim 9, characterized in that only one or more sections (112) are crimped in the circumferential direction of the edge.
11. Radialkolbenpumpe nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass ein nicht eingebördelter Randabschnitt (116) des topfformigen Belastungselements (98) zur Ausbildung einer Hubbegrenzung an eine axiale Anschlagsfläche (120) anlegbar ist.11. Radial piston pump according to claim 9 or 10, characterized in that a non-flanged edge portion (116) of the pot-shaped loading element (98) can be applied to an axial stop surface (120) to form a stroke limitation.
12. Radialkolbenpumpe nach Anspruch 11, dadurch gekennzeichnet, dass die axiale Anschlagsfläche (120) von einer Stirnseite (94) des Verschlußelements (90) gebildet ist .12. Radial piston pump according to claim 11, characterized in that the axial stop surface (120) is formed by an end face (94) of the closure element (90).
13. Radialkolbenpumpe nach einem der vorstehenden Ansprüche 5 bis 10, dadurch gekennzeichnet, dass im Inneren des topfformigen Belastungselements (98) eine Feder (104) vorgesehen ist, die sich einenends gegen die Innenseite des Topfbodens (100) und anderenends gegen eine13. Radial piston pump according to one of the preceding claims 5 to 10, characterized in that in the interior of the pot-shaped loading element (98) a spring (104) is provided, which at one end against the inside of the pot base (100) and at the other end against
Stirnseite des stif förmigen Ansatzes (96) abstützt. End face of the pin-shaped approach (96) is supported.
EP98952547A 1997-10-09 1998-09-04 Radial piston pump for supplying fuel at high pressure Expired - Lifetime EP1058783B1 (en)

Applications Claiming Priority (3)

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DE1997144577 DE19744577A1 (en) 1997-10-09 1997-10-09 Radial piston pump for high pressure fuel supply in motor vehicles
DE19744577 1997-10-09
PCT/DE1998/002611 WO1999019621A1 (en) 1997-10-09 1998-09-04 Radial piston pump for supplying fuel at high pressure

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EP1058783A1 true EP1058783A1 (en) 2000-12-13
EP1058783B1 EP1058783B1 (en) 2002-04-10

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JP (1) JP4235358B2 (en)
DE (2) DE19744577A1 (en)
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WO1999019621A1 (en) 1999-04-22
EP1058783B1 (en) 2002-04-10
JP4235358B2 (en) 2009-03-11
US6332761B1 (en) 2001-12-25
JP2001520349A (en) 2001-10-30
DE59803797D1 (en) 2002-05-16
DE19744577A1 (en) 1999-04-22

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