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EP2379871B1 - High pressure pump - Google Patents

High pressure pump Download PDF

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Publication number
EP2379871B1
EP2379871B1 EP09760836.8A EP09760836A EP2379871B1 EP 2379871 B1 EP2379871 B1 EP 2379871B1 EP 09760836 A EP09760836 A EP 09760836A EP 2379871 B1 EP2379871 B1 EP 2379871B1
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EP
European Patent Office
Prior art keywords
fluid
pressure
hollow cylindrical
cylinder housing
pressure pump
Prior art date
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Active
Application number
EP09760836.8A
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German (de)
French (fr)
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EP2379871A1 (en
Inventor
Uwe Nigrin
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Continental Automotive GmbH
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Continental Automotive GmbH
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Publication date
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Publication of EP2379871A1 publication Critical patent/EP2379871A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/205—Quantity of fuel admitted to pumping elements being metered by an auxiliary metering device
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment

Definitions

  • the invention relates to a high-pressure pump.
  • such a high-pressure pump is used as a feed pump for conveying fluid for a storage injection system for internal combustion engines of motor vehicles.
  • Storage injection systems for internal combustion engines of motor vehicles should be able to provide the necessary volume flow and the required fluid pressure.
  • the high-pressure pump is subject to strong loads in memory injection systems for motor vehicles, in particular mechanical stresses. In particular, large forces must be absorbed by such high-pressure pumps. Thus, both high demands are placed on the materials that make up the components of the high pressure pump, as well as the construction of the high pressure pump.
  • EP 1 898 084 A discloses a high-pressure fuel pump having a relief path connecting a high-pressure fuel pump disposed after an outlet valve of the high-pressure fuel pump with a low-pressure region in front of an inlet valve of the high-pressure fuel pump or with a pressure chamber of the high-pressure fuel pump, wherein a check valve is arranged in the discharge path a flow of Fuel is allowed from the high pressure region to the low pressure region when a differential pressure between an inlet and an outlet of the check valve is increased to or above a predetermined valve opening pressure.
  • the object of the invention is to provide a high-pressure pump, which allows reliable and precise operation even at high pump pressures and thereby subject to the lowest possible wear. At the same time, the high-pressure pump should be inexpensive to produce.
  • the invention is characterized by a high-pressure pump for conveying a fluid, with a rotatable drive shaft, a driven by the drive shaft pump unit having a cylinder housing with a fluid inlet chamber and a hydraulically coupled to the fluid inlet chamber high-pressure chamber in which an axially movable, with the drive shaft is arranged in operative connection with high-pressure piston and which can be acted upon by high pressure, and a volume flow control valve which is adapted to adjust the fluid flow into the high-pressure pump, wherein the volume flow control valve is at least partially disposed in the fluid inlet chamber.
  • fluid is to be understood here in its broader sense, so the fluid can be both a liquid and a gas.
  • Such a high pressure pump has the advantage that a direct hydraulic connection between the flow control valve and the fluid inlet chamber of the high pressure pump is possible. Thus, no connection line between the flow control valve and the fluid inlet chamber of the high-pressure pump is required. In particular, a compact design of the high-pressure pump with integrated volume flow control valve can be realized.
  • the fluid inlet chamber is arranged in a substantially hollow cylindrical portion of the cylinder housing, and the hollow cylindrical portion has an outer wall. This allows a simple arrangement of the flow control valve in the fluid inlet chamber of the high-pressure pump. This makes a simple production concept for the high-pressure pump possible.
  • the high-pressure pump has a connection piece with an inner fluid channel for supplying fluid.
  • the connecting piece has a hollow cylindrical basic body with an inner wall, which rests in a fluid-tight manner on the outer wall of the hollow cylindrical portion, and in the hollow cylindrical portion of the cylinder housing, a fluid passage opening is formed, by means of which the fluid channel is hydraulically coupled to the fluid inlet chamber.
  • an annular groove is formed in the hollow cylindrical base body in the region of the inner wall, and the connecting piece is arranged on the hollow cylindrical portion of the cylinder housing, that the fluid passage opening is hydraulically coupled to the annular groove.
  • the connecting piece is mechanically coupled by means of a snap connection with the hollow cylindrical portion of the cylinder housing. This has the advantage that a simple, rapid and secure coupling between the connecting piece and the hollow cylindrical portion of the cylinder housing is possible.
  • the connecting piece is formed from a material which comprises a plastic.
  • an inlet valve is disposed in the cylinder housing upstream of the high pressure chamber and downstream of the volumetric flow control valve, and the inlet valve is partially disposed within the volumetric flow control valve.
  • FIGS. 1 and 2 show a high-pressure pump 10 with a pump unit 12.
  • the high-pressure pump 10 can be used in particular for high-pressure fuel supply in a storage injection system of an internal combustion engine of a motor vehicle.
  • the high pressure pump 10 has centrally a drive shaft 16 which is in operative connection with a cam ring with cam 18 and is rotatable about a rotation axis D.
  • the number of conveying and compression strokes on the number of cams 18 can be specified.
  • the number of conveying or compression strokes corresponds to the number of cams.
  • an eccentric ring and sliding shoes can also be used in conjunction with the drive shaft 16.
  • a circular ring and a mushroom piston in conjunction with the drive shaft 16 can be used.
  • the high pressure pump 10 may also be designed as a crank drive pump.
  • the pump unit 12 essentially consists of a cylinder housing 14 with a longitudinal axis L, a high pressure piston 20, a high pressure chamber 21 arranged in the cylinder housing 14, a spring 26 and a plunger assembly 28.
  • the cylinder housing 14, the high pressure piston 20, the high pressure chamber 21 and the spring 26 are arranged coaxially with each other.
  • the cylinder housing 14 is formed of a metal, preferably a steel.
  • the high pressure piston 20 is axially movably mounted in the high pressure chamber 21 and is in operative connection with the drive shaft 16 and the cam 18.
  • the high-pressure piston 20 is held in constant contact with the cams 18 by means of the spring 26, which is preferably designed as a helical compression spring and is preferably supported on the cylinder housing 14 and on the high-pressure piston 20.
  • the cylinder housing 14 has a high-pressure chamber inlet line 22, in which preferably an inlet valve 23 is arranged.
  • the inlet valve 23 facilitates the filling of the high pressure chamber 21 and prevents the backflow of the fluid from the high pressure chamber inlet line 22 during filling.
  • the cylinder housing 14 further has a high pressure chamber drain line 24 and an outlet valve 25 arranged therein. Via the high-pressure chamber drain line 24, the outlet valve 25 and a high-pressure nozzle 29, the fluid can be ejected from the high-pressure chamber 21 in a flow direction F of the fluid in the direction of a fluid reservoir, not shown.
  • a fluid inlet chamber 30 is arranged, which is hydraulically coupled to the high-pressure chamber 21 via the inlet valve 23.
  • the fluid inlet chamber 30 is arranged in the cylinder housing 14 such that a hollow cylindrical portion 32 of the cylinder housing 14 is formed.
  • the hollow cylindrical portion 32 has an outer wall 34.
  • one or more fluid passage openings 36 are formed, which, based on the longitudinal axis L of the cylinder housing 14, extend in the radial direction.
  • a volume flow control valve 40 is arranged in the fluid inlet chamber 30, in the fluid inlet chamber 30, a volume flow control valve 40 is arranged.
  • the volume flow control valve 40 is only partially disposed in the fluid inlet chamber 30.
  • the volume flow control valve 40 may also be arranged completely in the fluid inlet chamber 30.
  • the volume flow control valve 40 serves to adjust the fluid flow in the high-pressure pump 10.
  • the volume flow control valve 40 has a valve inlet line 42 and a valve outlet line 44. Centrally in the volume flow control valve 40, a valve stem 46 is formed. Depending on the axial position of the valve stem 46, a fluid flow from the valve inlet line 42 to the valve drain line 44 may be possible or prevented.
  • the volume flow control valve 40 is fixedly arranged in the hollow cylindrical portion 32 of the cylinder housing 14 by means of a screw 48.
  • the volume flow control valve 40 instead of the screw 48 may also have a latching connection to fix the volume flow control valve 40 fixed in the hollow cylindrical portion 32 of the cylinder housing 14.
  • connecting elements for fastening the volume flow control valve 40 in the hollow cylindrical portion 32 of the cylinder housing 14 can be used.
  • sealing elements 50 By means of one or more sealing elements 50, leakage of fluid from the volume flow control valve 40 to the outside or inadvertent penetration of fluid into the valve drain line 44 can be prevented.
  • volume flow control valve 40 in the fluid inlet chamber 30, a direct hydraulic connection between the flow control valve 40 and the fluid inlet chamber 30 can be achieved.
  • no connection line between the volume flow control valve 40 and the fluid inlet chamber 30 of the high-pressure pump 10 is required.
  • a particularly compact construction of the high-pressure pump 10 with the integrated volume flow control valve 40 can thus be achieved.
  • the inlet valve 23 is partially disposed within the volume flow control valve 40. This makes it possible to achieve a very compact design of the high-pressure pump 10 with an integration of the volume flow control valve 40 and the inlet valve 23 in a construction space of the cylinder housing 14.
  • the inlet valve 23 may also be arranged completely outside the volume flow control valve 40.
  • the high-pressure pump 10 further has a connecting piece 52, with a hollow cylindrical base body 54 and a pipe section 56.
  • the connecting piece 52 is preferably formed from a material which comprises a plastic. Particularly preferably, a connecting piece 52 is completely formed from a plastic.
  • the hollow cylindrical base body 54 has a continuous fluid channel 58 in the direction of the longitudinal axis L of the cylinder housing 14.
  • the fluid channel 58 of the connecting piece 52 serves to supply fluid to the fluid inlet chamber 30 and thus on to the high-pressure chamber 21 of the high-pressure pump 10.
  • the hollow cylindrical basic body 54 has an inner wall 62, which rests in a fluid-tight manner on the outer wall 34 of the hollow cylindrical portion 32 of the cylinder housing 14.
  • the fluid channel 58 is hydraulically coupled to the fluid inlet chamber 30. It can thus be achieved that the connecting piece 52 is designed as the only common fluid connection for the high-pressure chamber 21 of the high-pressure pump 10 and the volume flow control valve 40.
  • annular groove 60 is formed through which a fluid flow from the fluid channel 58 to the valve inlet line 42 of the flow control valve 40 regardless of the position of the connecting piece 52 with respect to an azimuth angle ALPHA between the connecting piece 52 and a predetermined reference line (in the embodiment shown here by way of example with respect to a central axis M of the high-pressure port 29) is made possible ( FIG. 2 ).
  • the connecting piece 52 is coupled by means of a snap connection 64 in the direction of the longitudinal axis L of the cylinder housing 14 with the hollow cylindrical portion 32 of the cylinder housing 14.
  • the snap connection 64 allows a secure coupling between the connecting piece 52 and the hollow cylindrical portion 32 of the cylinder housing 14th
  • the high-pressure piston 20 is moved away from the drive shaft 16 by the cams 18 in the direction of the longitudinal axis L, thereby compressing the fluid located in the high-pressure chamber 21.
  • pressures of up to 2000 bar in the high pressure chamber 21 may occur.
  • the compressed fluid may be following the Compression stroke via the Hochdruckschablauftechnisch 24 and the now open exhaust valve 25 are ejected.
  • the high-pressure pump 10 is, for example, a high-pressure fuel pump of an injection system of an internal combustion engine, the fuel subjected to high pressure can reach a fluid accumulator designed as a high-pressure fuel accumulator, the so-called common rail.

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

Description

Die Erfindung betrifft eine Hochdruckpumpe.The invention relates to a high-pressure pump.

Vorzugsweise wird eine derartige Hochdruckpumpe als Förderpumpe zur Förderung von Fluid für ein Speichereinspritzsystem für Brennkraftmaschinen von Kraftfahrzeugen eingesetzt.Preferably, such a high-pressure pump is used as a feed pump for conveying fluid for a storage injection system for internal combustion engines of motor vehicles.

Speichereinspritzsysteme für Brennkraftmaschinen von Kraftfahrzeugen, beispielsweise in Common-Rail-Systemen, sollen den notwendigen Volumenstrom und den erforderlichen Fluiddruck bereitstellen können. Die Hochdruckpumpe unterliegt in Speichereinspritzsystemen für Kraftfahrzeuge starken Belastungen, insbesondere mechanischen Beanspruchungen. Insbesondere müssen von derartigen Hochdruckpumpen große Kräfte aufgenommen werden können. Damit werden sowohl hohe Anforderungen an die Materialien, aus denen die Komponenten der Hochdruckpumpe bestehen, als auch an die Konstruktion der Hochdruckpumpe gestellt.Storage injection systems for internal combustion engines of motor vehicles, for example in common-rail systems, should be able to provide the necessary volume flow and the required fluid pressure. The high-pressure pump is subject to strong loads in memory injection systems for motor vehicles, in particular mechanical stresses. In particular, large forces must be absorbed by such high-pressure pumps. Thus, both high demands are placed on the materials that make up the components of the high pressure pump, as well as the construction of the high pressure pump.

Da Hochdruckpumpen Drücken von beispielsweise bis zu 2000 bar oder mehr ausgesetzt sind, müssen sie hohen Beanspruchungen standhalten.Since high pressure pumps are exposed to pressures of, for example, up to 2000 bar or more, they must withstand high stresses.

EP 1 898 084 A offenbart eine Hochdruck-Kraftstoffpumpe mit einem Entlastungspfad, der einen nach einem Auslassventil der Hochdruck-Kraftstoffpumpe angeordneten Hochdruckbereich mit einem Niederdruckbereich vor einem Einlassventil der Hochdruck-Kraftstoffpumpe oder mit einem Druckraum der Hochdruck-Kraftstoffpumpe verbindet, wobei ein Rückschlagventil in dem Entlastungspfad angeordnet ist, das ein Fließen von Kraftstoff von dem Hochdruckbereich zu dem Niederdruckbereich erlaubt, wenn ein Differentialdruck zwischen einem Eingang und einem Ausgang des Rückschlagventils auf oder über einen vorgegebenen Ventilöffnungsdruck erhöht wird. Es ist ein Energiedämpfungsmechanismus vorhanden, der verhindert, dass das Rückschlagventil von einem unmittelbaren Druckanstieg in dem Hochdruckbereich geöffnet wird, indem ein Wegschaltmechanismus vorgesehen ist, der eine Verbindung zwischen dem Entlastungspfad und dem Hochdruckbereich unterbricht. EP 1 898 084 A discloses a high-pressure fuel pump having a relief path connecting a high-pressure fuel pump disposed after an outlet valve of the high-pressure fuel pump with a low-pressure region in front of an inlet valve of the high-pressure fuel pump or with a pressure chamber of the high-pressure fuel pump, wherein a check valve is arranged in the discharge path a flow of Fuel is allowed from the high pressure region to the low pressure region when a differential pressure between an inlet and an outlet of the check valve is increased to or above a predetermined valve opening pressure. There is an energy absorbing mechanism that prevents the check valve from being opened by an immediate increase in pressure in the high pressure area by providing a cutoff mechanism that breaks a communication between the unloading path and the high pressure area.

Die Aufgabe der Erfindung ist es, eine Hochdruckpumpe zu schaffen, die auch bei hohen Pumpendrücken einen zuverlässigen und präzisen Betrieb ermöglicht und dabei einem möglichst geringen Verschleiß unterliegt. Zugleich soll die Hochdruckpumpe kostengünstig herstellbar sein.The object of the invention is to provide a high-pressure pump, which allows reliable and precise operation even at high pump pressures and thereby subject to the lowest possible wear. At the same time, the high-pressure pump should be inexpensive to produce.

Die Aufgabe wird gelöst durch die Merkmale der unabhängigen Ansprüche. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.The object is solved by the features of the independent claims. Advantageous embodiments of the invention are characterized in the subclaims.

Die Erfindung zeichnet sich aus durch eine Hochdruckpumpe zur Förderung eines Fluids, mit einer drehbaren Antriebswelle, einer von der Antriebswelle antreibbaren Pumpeneinheit, die ein Zylindergehäuse mit einer Fluideintrittskammer und einer mit der Fluideintrittskammer hydraulisch koppelbaren Hochdruckkammer aufweist, in der ein axial bewegbarer, mit der Antriebswelle in Wirkverbindung stehender Hochdruckkolben angeordnet ist und die mit Hochdruck beaufschlagbar ist, und einem Volumenstromsteuerventil, das ausgebildet ist zum Einstellen des Fluidzuflusses in die Hochdruckpumpe, wobei das Volumenstromsteuerventil wenigstens teilweise in der Fluideintrittskammer angeordnet ist.The invention is characterized by a high-pressure pump for conveying a fluid, with a rotatable drive shaft, a driven by the drive shaft pump unit having a cylinder housing with a fluid inlet chamber and a hydraulically coupled to the fluid inlet chamber high-pressure chamber in which an axially movable, with the drive shaft is arranged in operative connection with high-pressure piston and which can be acted upon by high pressure, and a volume flow control valve which is adapted to adjust the fluid flow into the high-pressure pump, wherein the volume flow control valve is at least partially disposed in the fluid inlet chamber.

Der Begriff Fluid ist hier in seinem weiteren Sinne zu verstehen, das Fluid kann also sowohl eine Flüssigkeit als auch ein Gas sein.The term fluid is to be understood here in its broader sense, so the fluid can be both a liquid and a gas.

Eine derartige Hochdruckpumpe hat den Vorteil, dass eine direkte hydraulische Verbindung zwischen dem Volumenstromregelventil und der Fluideintrittskammer der Hochdruckpumpe möglich ist. Damit ist keine Verbindungsleitung zwischen dem Volumenstromregelventil und der Fluideintrittskammer der Hochdruckpumpe erforderlich. Es lässt sich insbesondere ein kompakter Aufbau der Hochdruckpumpe mit integriertem Volumenstromregelventil realisieren.Such a high pressure pump has the advantage that a direct hydraulic connection between the flow control valve and the fluid inlet chamber of the high pressure pump is possible. Thus, no connection line between the flow control valve and the fluid inlet chamber of the high-pressure pump is required. In particular, a compact design of the high-pressure pump with integrated volume flow control valve can be realized.

Die Fluidein-trittskammer ist in einem im Wesentlichen hohlzylinderförmigen Abschnitt des Zylindergehäuses angeordnet, und der hohlzylinderförmige Abschnitt weist eine Außenwand auf. Dies ermöglicht eine einfache Anordnung des Volumenstromregelventils in der Fluideintrittskammer der Hochdruckpumpe. Damit ist ein einfaches Fertigungskonzept für die Hochdruckpumpe möglich.The fluid inlet chamber is arranged in a substantially hollow cylindrical portion of the cylinder housing, and the hollow cylindrical portion has an outer wall. This allows a simple arrangement of the flow control valve in the fluid inlet chamber of the high-pressure pump. This makes a simple production concept for the high-pressure pump possible.

Die Hochdruckpumpe weist einen Anschlussstutzen mit einem inneren Fluidkanal zum Zuführen von Fluid auf. Der Anschlussstutzen hat einen hohlzylinderförmigen Grundkörper mit einer Innenwand, die fluiddicht an der Außenwand des hohlzylinderförmigen Abschnitts anliegt, und in dem hohlzylinderförmigen Abschnitt des Zylindergehäuses ist eine Fluiddurchtrittsöffnung ausgebildet, mittels der der Fluidkanal hydraulisch mit der Fluideintrittskammer gekoppelt ist. Dies hat den Vorteil, dass nur ein einziger gemeinsamer Fluidanschluss zum Zuführen von Fluid zu der Hochdruckpumpe und dem Volumenstromregelventil erforderlich ist.The high-pressure pump has a connection piece with an inner fluid channel for supplying fluid. The connecting piece has a hollow cylindrical basic body with an inner wall, which rests in a fluid-tight manner on the outer wall of the hollow cylindrical portion, and in the hollow cylindrical portion of the cylinder housing, a fluid passage opening is formed, by means of which the fluid channel is hydraulically coupled to the fluid inlet chamber. This has the advantage that only a single common fluid port is required for supplying fluid to the high pressure pump and the flow control valve.

In einer weiteren bevorzugten Ausführungsform ist in dem hohlzylinderförmigen Grundkörper im Bereich der Innenwand eine Ringnut ausgebildet, und der Anschlussstutzen ist derart an dem hohlzylinderförmigen Abschnitt des Zylindergehäuses angeordnet, dass die Fluiddurchtrittsöffnung hydraulisch mit der Ringnut gekoppelt ist. Dies hat den Vorteil, dass der Anschlussstutzen in einem beliebigen Azimuthwinkel gegenüber dem hohlzylinderförmigen Abschnitt des Zylindergehäuses ausgerichtet sein kann.In a further preferred embodiment, an annular groove is formed in the hollow cylindrical base body in the region of the inner wall, and the connecting piece is arranged on the hollow cylindrical portion of the cylinder housing, that the fluid passage opening is hydraulically coupled to the annular groove. This has the advantage that the connecting piece can be aligned in any azimuth angle with respect to the hollow cylindrical portion of the cylinder housing.

Besonders bevorzugt ist, wenn der Anschlussstutzen mittels einer Schnappverbindung mechanisch mit dem hohlzylinderförmigen Abschnitt des Zylindergehäuses gekoppelt ist. Dies hat den Vorteil, dass eine einfache, rasche und sichere Kopplung zwischen dem Anschlussstutzen und dem hohlzylinderförmigen Abschnitt des Zylindergehäuses möglich ist.It is particularly preferred if the connecting piece is mechanically coupled by means of a snap connection with the hollow cylindrical portion of the cylinder housing. This has the advantage that a simple, rapid and secure coupling between the connecting piece and the hollow cylindrical portion of the cylinder housing is possible.

In einer weiteren bevorzugten Ausführungsform ist der Anschlussstutzen aus einem Material gebildet, das einen Kunststoff aufweist. Damit ist eine einfache und kostengünstige Ausführung des Anschlussstutzens möglich.In a further preferred embodiment, the connecting piece is formed from a material which comprises a plastic. For a simple and inexpensive design of the connection piece is possible.

In einer weiteren bevorzugten Ausführungsform ist in dem Zylindergehäuse stromaufwärts der Hochdruckkammer und stromabwärts des Volumenstromsteuerventils ein Einlassventil angeordnet, und das Einlassventil ist teilweise innerhalb des Volumenstromsteuerventils angeordnet. Damit ist ein sehr kompakter Aufbau der Einheit aus Hochdruckpumpe mit integriertem Volumenstromregelventil möglich.In another preferred embodiment, an inlet valve is disposed in the cylinder housing upstream of the high pressure chamber and downstream of the volumetric flow control valve, and the inlet valve is partially disposed within the volumetric flow control valve. This allows a very compact design of the unit consisting of high-pressure pump with integrated flow control valve.

Ausführungsbeispiele der Erfindung sind im Folgenden anhand der schematischen Zeichnungen näher erläutert.Embodiments of the invention are explained in more detail below with reference to the schematic drawings.

Es zeigen:

  • Figur 1 eine schematische Ansicht einer Hochdruckpumpe in einem Längsschnitt, und
  • Figur 2 eine schematische Ansicht der Hochdruckpumpe in einem Querschnitt entlang der Linie II-II' der Figur 1.
Show it:
  • FIG. 1 a schematic view of a high-pressure pump in a longitudinal section, and
  • FIG. 2 a schematic view of the high-pressure pump in a cross section along the line II-II 'of FIG. 1 ,

Elemente gleicher Konstruktion oder Funktion sind figurenübergreifend mit den gleichen Bezugszeichen versehen.Elements of the same construction or function are provided across the figures with the same reference numerals.

Die Figuren 1 und 2 zeigen eine Hochdruckpumpe 10 mit einer Pumpeneinheit 12. Die Hochdruckpumpe 10 kann insbesondere zur Kraftstoffhochdruckversorgung bei einem Speichereinspritzsystem einer Brennkraftmaschine eines Kraftfahrzeugs verwendet werden.The FIGS. 1 and 2 show a high-pressure pump 10 with a pump unit 12. The high-pressure pump 10 can be used in particular for high-pressure fuel supply in a storage injection system of an internal combustion engine of a motor vehicle.

Die Hochdruckpumpe 10 weist zentral eine Antriebswelle 16 auf, die mit einem Nockenring mit Nocken 18 in Wirkverbindung steht und um eine Drehachse D drehbar ist. In diesem Fall kann die Anzahl der Förder- und Kompressionshübe über die Anzahl der Nocken 18 vorgegeben werden. Die Anzahl der Förderbeziehungsweise Kompressionshübe entspricht dabei der Anzahl der Nocken. Anstelle des Nockenrings mit den Nocken 18 können auch ein Exzenterring und Gleitschuhe in Verbindung mit der Antriebswelle 16 zum Einsatz kommen. Ebenso können anstelle des Nockenrings mit den Nocken 18 auch ein kreisförmiger Ring und ein Pilzkolben in Verbindung mit der Antriebswelle 16 eingesetzt werden. Alternativ kann die Hochdruckpumpe 10 auch als Kurbeltriebpumpe ausgeführt sein.The high pressure pump 10 has centrally a drive shaft 16 which is in operative connection with a cam ring with cam 18 and is rotatable about a rotation axis D. In this case, the number of conveying and compression strokes on the number of cams 18 can be specified. The number of conveying or compression strokes corresponds to the number of cams. Instead of the cam ring with the cams 18, an eccentric ring and sliding shoes can also be used in conjunction with the drive shaft 16. Likewise, instead of the cam ring with the cams 18, a circular ring and a mushroom piston in conjunction with the drive shaft 16 can be used. Alternatively, the high pressure pump 10 may also be designed as a crank drive pump.

Die Pumpeneinheit 12 besteht im Wesentlichen aus einem Zylindergehäuse 14 mit einer Längsachse L, einem Hochdruckkolben 20, einer in dem Zylindergehäuse 14 angeordneten Hochdruckkammer 21, einer Feder 26 und einer Stößelbaugruppe 28.The pump unit 12 essentially consists of a cylinder housing 14 with a longitudinal axis L, a high pressure piston 20, a high pressure chamber 21 arranged in the cylinder housing 14, a spring 26 and a plunger assembly 28.

Das Zylindergehäuse 14, der Hochdruckkolben 20, die Hochdruckkammer 21 und die Feder 26 sind zueinander koaxial angeordnet. Das Zylindergehäuse 14 ist aus einem Metall, vorzugsweise einem Stahl gebildet.The cylinder housing 14, the high pressure piston 20, the high pressure chamber 21 and the spring 26 are arranged coaxially with each other. The cylinder housing 14 is formed of a metal, preferably a steel.

Der Hochdruckkolben 20 ist axial bewegbar in der Hochdruckkammer 21 gelagert und steht mit der Antriebswelle 16 und den Nocken 18 in Wirkverbindung. Der Hochdruckkolben 20 wird mittels der Feder 26, die vorzugsweise als Schraubendruckfeder ausgebildet ist und sich vorzugsweise am Zylindergehäuse 14 und am Hochdruckkolben 20 abstützt, in ständiger Anlage an die Nocken 18 gehalten. Damit kann ein Abheben und Wiederauftreffen des Hochdruckkolbens 20 auf die Nocken 18 vermieden werden, was zu Beschädigungen sowohl der Nocken 18 als auch des Hochdruckkolbens 20 führen könnte.The high pressure piston 20 is axially movably mounted in the high pressure chamber 21 and is in operative connection with the drive shaft 16 and the cam 18. The high-pressure piston 20 is held in constant contact with the cams 18 by means of the spring 26, which is preferably designed as a helical compression spring and is preferably supported on the cylinder housing 14 and on the high-pressure piston 20. Thus, a lifting and re-impact of the high pressure piston 20 can be avoided on the cam 18, which could lead to damage to both the cam 18 and the high-pressure piston 20.

Um die Hochdruckkammer 21 mit Fluid befüllen zu können, weist das Zylindergehäuse 14 eine Hochdruckkammerzulaufleitung 22 auf, in der vorzugsweise ein Einlassventil 23 angeordnet ist. Das Einlassventil 23 erleichtert die Befüllung der Hochdruckkammer 21 und verhindert beim Befüllen das Zurückströmen des Fluids aus der Hochdruckkammerzulaufleitung 22. Das Zylindergehäuse 14 weist weiter eine Hochdruckkammerablaufleitung 24 und ein in dieser angeordnetes Auslassventil 25 auf. Über die Hochdruckkammerablaufleitung 24, das Auslassventil 25 und einen Hochdruckstutzen 29 kann das Fluid aus der Hochdruckkammer 21 in einer Strömungsrichtung F des Fluids in Richtung zu einem nicht dargestellten Fluidspeicher ausgestoßen werden.In order to be able to fill the high-pressure chamber 21 with fluid, the cylinder housing 14 has a high-pressure chamber inlet line 22, in which preferably an inlet valve 23 is arranged. The inlet valve 23 facilitates the filling of the high pressure chamber 21 and prevents the backflow of the fluid from the high pressure chamber inlet line 22 during filling. The cylinder housing 14 further has a high pressure chamber drain line 24 and an outlet valve 25 arranged therein. Via the high-pressure chamber drain line 24, the outlet valve 25 and a high-pressure nozzle 29, the fluid can be ejected from the high-pressure chamber 21 in a flow direction F of the fluid in the direction of a fluid reservoir, not shown.

Während eines Saughubs, das heißt einer bezüglich der Figur 1 abwärts gerichteten Bewegung des Hochdruckkolbens 20, wird Fluid, insbesondere Kraftstoff aus der Hochdruckkammerzulaufleitung 22 über das Einlassventil 23 in die Hochdruckkammer 21 gefördert, wobei das Auslassventil 25 geschlossen ist. Während eines Pumphubs, das heißt einer bezüglich der Figur 1 aufwärts gerichteten Bewegung des Hochdruckkolbens 20, wird der in der Hochdruckkammer 21 befindliche Kraftstoff komprimiert beziehungsweise über das Auslassventil 25 unter hohem Druck abgegeben, wobei das Einlassventil 23 geschlossen ist.During a suction stroke, that is one regarding the FIG. 1 downward movement of the high pressure piston 20, fluid, in particular fuel from the high pressure chamber inlet line 22 via the inlet valve 23 is conveyed into the high pressure chamber 21, wherein the outlet valve 25 is closed. During a pumping stroke, that is one regarding the FIG. 1 upward movement of the high-pressure piston 20, the fuel in the high-pressure chamber 21 is compressed or discharged via the outlet valve 25 under high pressure, wherein the inlet valve 23 is closed.

In dem Zylindergehäuse 14 ist eine Fluideintrittskammer 30 angeordnet, die über das Einlassventil 23 hydraulisch mit der Hochdruckkammer 21 gekoppelt ist. Die Fluideintrittskammer 30 ist derart in dem Zylindergehäuse 14 angeordnet, dass ein hohlzylinderförmiger Abschnitt 32 des Zylindergehäuses 14 ausgebildet ist. Der hohlzylinderförmige Abschnitt 32 weist eine Außenwand 34 aus. In dem hohlzylinderförmigen Abschnitt 32 des Zylindergehäuses 14 sind eine oder mehrere Fluiddurchtrittsöffnungen 36 ausgebildet, die sich, bezogen auf die Längsachse L des Zylindergehäuses 14, in radialer Richtung erstrecken. In der Fluideintrittskammer 30 ist ein Volumenstromsteuerventil 40 angeordnet. In der hier dargestellten Ausführungsform ist das Volumenstromsteuerventil 40 lediglich teilweise in der Fluideintrittskammer 30 angeordnet. In weiteren Ausführungsformen kann das Volumenstromsteuerventil 40 auch vollständig in der Fluideintrittskammer 30 angeordnet sein.In the cylinder housing 14, a fluid inlet chamber 30 is arranged, which is hydraulically coupled to the high-pressure chamber 21 via the inlet valve 23. The fluid inlet chamber 30 is arranged in the cylinder housing 14 such that a hollow cylindrical portion 32 of the cylinder housing 14 is formed. The hollow cylindrical portion 32 has an outer wall 34. In the hollow cylindrical portion 32 of the cylinder housing 14, one or more fluid passage openings 36 are formed, which, based on the longitudinal axis L of the cylinder housing 14, extend in the radial direction. In the fluid inlet chamber 30, a volume flow control valve 40 is arranged. In the embodiment illustrated here, the volume flow control valve 40 is only partially disposed in the fluid inlet chamber 30. In further embodiments, the volume flow control valve 40 may also be arranged completely in the fluid inlet chamber 30.

Das Volumenstromsteuerventil 40 dient dazu, den Fluidfluss in die Hochdruckpumpe 10 einzustellen. Das Volumenstromsteuerventil 40 hat eine Ventilzulaufleitung 42 und eine Ventilablaufleitung 44. Zentral in dem Volumenstromsteuerventil 40 ist ein Ventilstößel 46 ausgebildet. Abhängig von der axialen Stellung des Ventilstößels 46 kann ein Fluidfluss von der Ventilzulaufleitung 42 zu der Ventilablaufleitung 44 ermöglicht sein oder dieser unterbunden werden.The volume flow control valve 40 serves to adjust the fluid flow in the high-pressure pump 10. The volume flow control valve 40 has a valve inlet line 42 and a valve outlet line 44. Centrally in the volume flow control valve 40, a valve stem 46 is formed. Depending on the axial position of the valve stem 46, a fluid flow from the valve inlet line 42 to the valve drain line 44 may be possible or prevented.

Das Volumenstromsteuerventil 40 ist mittels einer Verschraubung 48 fest in dem hohlzylinderförmigen Abschnitt 32 des Zylindergehäuses 14 angeordnet. In weiteren Ausführungsformen kann das Volumenstromsteuerventil 40 anstelle der Verschraubung 48 auch eine Rastverbindung aufweisen, um das Volumenstromsteuerventil 40 fest in dem hohlzylinderförmigen Abschnitt 32 des Zylindergehäuses 14 zu befestigen. Des Weiteren können zusätzlich oder alternativ Verbindungselemente zur Befestigung des Volumenstromsteuerventils 40 in dem hohlzylinderförmigen Abschnitt 32 des Zylindergehäuses 14 eingesetzt werden.The volume flow control valve 40 is fixedly arranged in the hollow cylindrical portion 32 of the cylinder housing 14 by means of a screw 48. In further embodiments, the volume flow control valve 40 instead of the screw 48 may also have a latching connection to fix the volume flow control valve 40 fixed in the hollow cylindrical portion 32 of the cylinder housing 14. Furthermore, additionally or alternatively, connecting elements for fastening the volume flow control valve 40 in the hollow cylindrical portion 32 of the cylinder housing 14 can be used.

Mittels eines oder mehrerer Dichtelemente 50 kann ein Austreten von Fluid aus dem Volumenstromsteuerventil 40 nach außen beziehungsweise ein unbeabsichtigtes Eindringen von Fluid in die Ventilablaufleitung 44 verhindert werden.By means of one or more sealing elements 50, leakage of fluid from the volume flow control valve 40 to the outside or inadvertent penetration of fluid into the valve drain line 44 can be prevented.

Durch eine derartige Anordnung des Volumenstromsteuerventils 40 in der Fluideintrittskammer 30 kann eine direkte hydraulische Verbindung zwischen dem Volumenstromsteuerventil 40 und der Fluideintrittskammer 30 erreicht werden. Damit ist keine Verbindungsleitung zwischen dem Volumenstromsteuerventil 40 und der Fluideintrittskammer 30 der Hochdruckpumpe 10 erforderlich. Es kann so insbesondere ein besonders kompakter Aufbau der Hochdruckpumpe 10 mit dem integrierten Volumenstromsteuerventil 40 erreicht werden.Such an arrangement of the volume flow control valve 40 in the fluid inlet chamber 30, a direct hydraulic connection between the flow control valve 40 and the fluid inlet chamber 30 can be achieved. Thus, no connection line between the volume flow control valve 40 and the fluid inlet chamber 30 of the high-pressure pump 10 is required. In particular, a particularly compact construction of the high-pressure pump 10 with the integrated volume flow control valve 40 can thus be achieved.

In der hier gezeigten Ausführungsform ist das Einlassventil 23 teilweise innerhalb des Volumenstromsteuerventils 40 angeordnet. Damit lässt sich ein sehr kompakter Aufbau der Hochdruckpumpe 10 mit einer Integration des Volumenstromsteuerventils 40 und des Einlassventils 23 in einem Bauraum des Zylindergehäuses 14 erreichen. Das Einlassventil 23 kann jedoch auch vollständig außerhalb des Volumenstromsteuerventils 40 angeordnet sein.In the embodiment shown here, the inlet valve 23 is partially disposed within the volume flow control valve 40. This makes it possible to achieve a very compact design of the high-pressure pump 10 with an integration of the volume flow control valve 40 and the inlet valve 23 in a construction space of the cylinder housing 14. However, the inlet valve 23 may also be arranged completely outside the volume flow control valve 40.

Die Hochdruckpumpe 10 weist weiter einen Anschlussstutzen 52 auf, mit einem hohlzylinderförmigen Grundkörper 54 und einem Rohrabschnitt 56. Der Anschlussstutzen 52 ist bevorzugt aus einem Material gebildet, das einen Kunststoff aufweist. Besonders bevorzugt ist ein Anschlussstutzen 52 vollständig aus einem Kunststoff gebildet.The high-pressure pump 10 further has a connecting piece 52, with a hollow cylindrical base body 54 and a pipe section 56. The connecting piece 52 is preferably formed from a material which comprises a plastic. Particularly preferably, a connecting piece 52 is completely formed from a plastic.

Der hohlzylinderförmige Grundkörper 54 weist einen durchgehenden Fluidkanal 58 in Richtung der Längsachse L des Zylindergehäuses 14 auf. Der Fluidkanal 58 des Anschlussstutzens 52 dient dem Zuführen von Fluid zu der Fluideintrittskammer 30 und damit weiter zu der Hochdruckkammer 21 der Hochdruckpumpe 10.The hollow cylindrical base body 54 has a continuous fluid channel 58 in the direction of the longitudinal axis L of the cylinder housing 14. The fluid channel 58 of the connecting piece 52 serves to supply fluid to the fluid inlet chamber 30 and thus on to the high-pressure chamber 21 of the high-pressure pump 10.

Der hohlzylinderförmige Grundkörper 54 hat eine Innenwand 62, die fluiddicht an der Außenwand 34 des hohlzylinderförmigen Abschnitts 32 des Zylindergehäuses 14 anliegt. Mittels der Fluiddurchtrittsöffnung 36 ist der Fluidkanal 58 hydraulisch mit der Fluideintrittskammer 30 gekoppelt. Damit kann erreicht werden, dass der Anschlussstutzen 52 als einziger gemeinsamer Fluidanschluß für die Hochdruckkammer 21 der Hochdruckpumpe 10 und das Volumenstromsteuerventil 40 ausgebildet ist.The hollow cylindrical basic body 54 has an inner wall 62, which rests in a fluid-tight manner on the outer wall 34 of the hollow cylindrical portion 32 of the cylinder housing 14. By means of the fluid passage opening 36, the fluid channel 58 is hydraulically coupled to the fluid inlet chamber 30. It can thus be achieved that the connecting piece 52 is designed as the only common fluid connection for the high-pressure chamber 21 of the high-pressure pump 10 and the volume flow control valve 40.

In dem hohlzylinderförmigen Grundkörper 54 des Anschlussstutzens 52 ist eine Ringnut 60 ausgebildet, durch die ein Fluidfluss von dem Fluidkanal 58 zu der Ventilzulaufleitung 42 des Volumenstromsteuerventils 40 unabhängig von der Stellung des Anschlussstutzens 52 in Bezug auf einen Azimuthwinkel ALPHA zwischen dem Anschlussstutzen 52 und einer vorgegebenen Bezugslinie (in der hier dargestellten Ausführungsform beispielhaft bezüglich einer Mittelachse M des Hochdruckstutzens 29) ermöglicht ist (Figur 2).In the hollow cylindrical body 54 of the connecting piece 52, an annular groove 60 is formed through which a fluid flow from the fluid channel 58 to the valve inlet line 42 of the flow control valve 40 regardless of the position of the connecting piece 52 with respect to an azimuth angle ALPHA between the connecting piece 52 and a predetermined reference line (in the embodiment shown here by way of example with respect to a central axis M of the high-pressure port 29) is made possible ( FIG. 2 ).

In der hier gezeigten Ausführungsform ist der Anschlussstutzen 52 mittels einer Schnappverbindung 64 in Richtung der Längsachse L des Zylindergehäuses 14 mit dem hohlzylinderförmigen Abschnitt 32 des Zylindergehäuses 14 gekoppelt. Die Schnappverbindung 64 ermöglicht eine sichere Kopplung zwischen dem Anschlussstutzen 52 und dem hohlzylinderförmigen Abschnitt 32 des Zylindergehäuses 14.In the embodiment shown here, the connecting piece 52 is coupled by means of a snap connection 64 in the direction of the longitudinal axis L of the cylinder housing 14 with the hollow cylindrical portion 32 of the cylinder housing 14. The snap connection 64 allows a secure coupling between the connecting piece 52 and the hollow cylindrical portion 32 of the cylinder housing 14th

Zwischen der Innenwand 62 des Grundkörpers 54 und der Außenwand 34 des Zylindergehäuses 14 sind weitere Dichtelemente 66 angeordnet, mittels denen eine Fluidleckage zwischen dem hohlzylinderförmigen Abschnitt 32 des Zylindergehäuses 14 und dem Anschlussstutzen 52 vermieden werden kann.Between the inner wall 62 of the base body 54 and the outer wall 34 of the cylinder housing 14 further sealing elements 66 are arranged, by means of which a fluid leakage between the hollow cylindrical portion 32 of the cylinder housing 14 and the connecting piece 52 can be avoided.

Insgesamt erlaubt eine Realisierung einer derartigen Hochdruckpumpe 10 einen sehr kompakten Aufbau der Pumpeneinheit 12, wodurch eine besonders kostengünstige Konstruktion der Hochdruckpumpe 10 mit wenigen Einzelteilen und ein sehr kleiner Bauraum inklusive des Volumenstromsteuerventils 40 erreicht werden kann.Overall, a realization of such a high pressure pump 10 allows a very compact design of the pump unit 12, whereby a particularly cost-effective design of the high-pressure pump 10 with a few items and a very small space including the flow control valve 40 can be achieved.

Im Folgenden soll die Funktionsweise der Hochdruckpumpe 10 beschrieben werden:

  • Im Ausgangszustand soll sich der Hochdruckkolben 20 in einer Position in der Pumpeneinheit 12 befinden, in der er einen maximalen Abstand von der Antriebswelle 16 aufweist, wie in Figur 1 dargestellt.
The mode of operation of the high-pressure pump 10 will be described below:
  • In the initial state, the high-pressure piston 20 should be in a position in the pump unit 12 in which it has a maximum distance from the drive shaft 16, as in FIG. 1 shown.

Durch eine Drehbewegung der Antriebswelle 16 um die Drehachse D wird der Hochdruckkolben 20 mittels der Nocken 18 in Richtung der Längsachse L zu der Antriebswelle 16 hinbewegt. Durch die Bewegung des Hochdruckkolbens 20 wird die Hochdruckkammer 21 vergrößert und das Fluid wird über den Fluidkanal 58 und die Ringnut 60 des Anschlussstutzens 52, die Fluiddurchtrittsöffnung 36 des Zylindergehäuses 14, die Ventilzulaufleitung 42 und die Ventilablaufleitung 44 des Volumenstromsteuerventils 40, und die Fluideintrittskammer 30 über das als Rückschlagventil ausgebildete Einlassventil 23 in die Hochdruckkammer 21 geführt. Dabei wird die Hochdruckkammer 21 mit Fluid befüllt.By a rotational movement of the drive shaft 16 about the axis of rotation D of the high pressure piston 20 is moved by means of the cam 18 in the direction of the longitudinal axis L to the drive shaft 16. By the movement of the high pressure piston 20, the high pressure chamber 21 is increased and the fluid is via the fluid passage 58 and the annular groove 60 of the connecting piece 52, the fluid passage opening 36 of the cylinder housing 14, the valve inlet line 42 and the valve drain line 44 of the flow control valve 40, and the fluid inlet chamber 30 via formed as a check valve inlet valve 23 is guided into the high-pressure chamber 21. In this case, the high-pressure chamber 21 is filled with fluid.

Durch die weitere Drehbewegung der Antriebswelle 16 wird der Hochdruckkolben 20 durch die Nocken 18 in Richtung der Längsachse L von der Antriebswelle 16 wegbewegt und verdichtet dabei das in der Hochdruckkammer 21 befindliche Fluid. Hierbei können Drücke von bis zu 2000 bar in der Hochdruckkammer 21 auftreten. Das komprimierte Fluid kann im Anschluss an den Kompressionshub über die Hochdruckkammerablaufleitung 24 und das nun geöffnete Auslassventil 25 ausgestoßen werden.As a result of the further rotational movement of the drive shaft 16, the high-pressure piston 20 is moved away from the drive shaft 16 by the cams 18 in the direction of the longitudinal axis L, thereby compressing the fluid located in the high-pressure chamber 21. In this case, pressures of up to 2000 bar in the high pressure chamber 21 may occur. The compressed fluid may be following the Compression stroke via the Hochdruckkammerablaufleitung 24 and the now open exhaust valve 25 are ejected.

Handelt es sich bei der Hochdruckpumpe 10 etwa um eine Kraftstoffhochdruckpumpe einer Einspritzanlage einer Brennkraftmaschine, so kann der mit hohem Druck beaufschlagte Kraftstoff zu einem als Hochdruckkraftstoffspeicher ausgebildeten Fluidspeicher, dem so genannten Common-Rail gelangen.If the high-pressure pump 10 is, for example, a high-pressure fuel pump of an injection system of an internal combustion engine, the fuel subjected to high pressure can reach a fluid accumulator designed as a high-pressure fuel accumulator, the so-called common rail.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Hochdruckpumpehigh pressure pump
1212
Pumpeneinheitpump unit
1414
Zylindergehäusecylinder housing
1616
Antriebswelledrive shaft
1818
Nockencam
2020
HochdruckkolbenHigh pressure piston
2121
HochdruckkammerHigh-pressure chamber
2222
HochdruckkammerzulaufleitungHigh-pressure chamber inlet line
2323
Einlassventilintake valve
2424
HochdruckkammerablaufleitungHigh-pressure chamber drain pipe
2525
Auslassventiloutlet valve
2626
Federfeather
2828
Stößelbaugruppetappet assembly
2929
HochdruckstutzenHigh pressure connection
3030
FluideintrittskammerFluid inlet chamber
3232
hohlzylinderförmiger Abschnitt des Zylindergehäuseshollow cylindrical portion of the cylinder housing
3434
Außenwand des hohlzylinderförmigen AbschnittsOuter wall of the hollow cylindrical section
3636
Fluiddurchtrittsöffnung des ZylindergehäusesFluid passage opening of the cylinder housing
4040
VolumenstromsteuerventilFlow control valve
4242
VentilzulaufleitungValve supply line
4444
VentilablaufleitungValve drain pipe
4646
Ventilstößeltappet
4848
Verschraubungscrew
5050
Dichtelementsealing element
5252
Anschlussstutzenspigot
5454
hohlzylinderförmiger Grundkörper des Anschlussst.hollow cylindrical body of the Anschlussst.
5656
Rohrabschnitt des AnschlussstutzensPipe section of the connecting piece
5858
Fluidkanalfluid channel
6060
Ringnutring groove
6262
Innenwand des GrundkörpersInner wall of the main body
6464
Schnappverbindungsnap
6666
Dichtelementsealing element
FF
Strömungsrichtung des FluidsFlow direction of the fluid
LL
Längsachse des ZylindergehäusesLongitudinal axis of the cylinder housing
DD
Drehachseaxis of rotation
MM
Mittelachsecentral axis

Claims (5)

  1. High-pressure pump (10) for delivering a fluid, having
    - a rotatable drive shaft (16),
    - a pump unit (12) which can be driven by the drive shaft (16) and which has a cylinder housing (14) with a fluid inlet chamber (30) and with a high-pressure chamber (21) which is hydraulically couplable to the fluid inlet chamber (30), in which high-pressure chamber there is arranged an axially moveable high-pressure piston (20) which is operatively connected to the drive shaft (16), and which high-pressure chamber can be charged with high pressure, and
    - a volume flow control valve (40) which is designed for adjusting the fluid inflow into the high-pressure pump (10), wherein the volume flow control valve (40) is arranged at least partially in the fluid inlet chamber (30),
    characterized in that the fluid inlet chamber (30) is arranged in a substantially hollow cylindrical section (32) of the cylinder housing (14), and the hollow cylindrical section (32) has an outer wall (34), and in that the high-pressure pump (10) has a connection piece (52) with an inner fluid duct (58) for the supply of fluid, wherein the connection piece (52) has a hollow cylindrical main body (54) with an inner wall (62) which bears in fluid-tight fashion against the outer wall (34) of the hollow cylindrical section (32),
    and, in the hollow cylindrical section (32) of the cylinder housing (14), there is formed a fluid passage opening (36) by means of which the fluid duct (58) is hydraulically coupled to the fluid inlet chamber (30).
  2. High-pressure pump (10) according to Claim 1, wherein a ring-shaped groove (60) is formed in the hollow cylindrical main body (54) in the region of the inner wall (62), and the connection piece (52) is arranged on the hollow cylindrical section (32) of the cylinder housing (14) such that the fluid passage opening (36) is hydraulically coupled to the ring-shaped groove (60).
  3. High-pressure pump (10) according to either of Claims 1 and 2, wherein the connection piece (52) is mechanically coupled, by way of a snap-action connection (64), to the hollow cylindrical section (32) of the cylinder housing (14).
  4. High-pressure pump (10) according to one of Claims 1 to 3, wherein the connection piece (52) is formed from a material which has a plastic.
  5. High-pressure pump (10) according to one of the preceding claims, wherein an inlet valve (23) is arranged in the cylinder housing (14) upstream of the high-pressure chamber (21) and downstream of the volume flow control valve (20), and the inlet valve (23) is arranged partially within the volume flow control valve (40).
EP09760836.8A 2008-12-16 2009-11-23 High pressure pump Active EP2379871B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008062518.3A DE102008062518B4 (en) 2008-12-16 2008-12-16 high pressure pump
PCT/EP2009/065661 WO2010072493A1 (en) 2008-12-16 2009-11-23 High pressure pump

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EP2379871A1 EP2379871A1 (en) 2011-10-26
EP2379871B1 true EP2379871B1 (en) 2017-02-08

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EP09760836.8A Active EP2379871B1 (en) 2008-12-16 2009-11-23 High pressure pump

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EP (1) EP2379871B1 (en)
DE (1) DE102008062518B4 (en)
WO (1) WO2010072493A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011003104A1 (en) * 2011-01-25 2012-07-26 Continental Automotive Gmbh High pressure pump i.e. fuel high-pressure pump, for use as delivery pump to convey fluid into fuel-injection system for combustion engine of motor car, has control valve partially arranged at outside of casing to adjust fluid inflow
DE102012224430A1 (en) * 2012-12-27 2014-07-03 Robert Bosch Gmbh High pressure pump for a fuel injection system
DE102021102709A1 (en) 2021-02-05 2022-08-11 Joachim Risse HIGH PRESSURE PUMP

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5058553A (en) * 1988-11-24 1991-10-22 Nippondenso Co., Ltd. Variable-discharge high pressure pump
DE10124238A1 (en) * 2001-05-18 2002-11-28 Bosch Gmbh Robert High pressure fuel pump, especially for direct-injection internal combustion engine, has non-return and control valves in common valve module, common connector to low pressure inlet
JP3944413B2 (en) * 2002-05-24 2007-07-11 株式会社日立製作所 High pressure fuel supply pump
DE10327411B4 (en) * 2002-10-15 2015-12-17 Robert Bosch Gmbh Pressure relief valve and fuel system with such a pressure relief valve
JP4415929B2 (en) * 2005-11-16 2010-02-17 株式会社日立製作所 High pressure fuel supply pump
JP2007162677A (en) * 2005-11-21 2007-06-28 Denso Corp High-pressure fuel pump
JP2008057451A (en) * 2006-08-31 2008-03-13 Hitachi Ltd High-pressure fuel supply pump

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EP2379871A1 (en) 2011-10-26
WO2010072493A1 (en) 2010-07-01
DE102008062518B4 (en) 2016-05-25
DE102008062518A1 (en) 2010-06-24

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