WO2015139871A1 - Pump, in particular high-pressure fuel pump for a fuel injection device of an internal combustion engine - Google Patents

Pump, in particular high-pressure fuel pump for a fuel injection device of an internal combustion engine Download PDF

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Publication number
WO2015139871A1
WO2015139871A1 PCT/EP2015/051835 EP2015051835W WO2015139871A1 WO 2015139871 A1 WO2015139871 A1 WO 2015139871A1 EP 2015051835 W EP2015051835 W EP 2015051835W WO 2015139871 A1 WO2015139871 A1 WO 2015139871A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
pump piston
cylinder bore
ring
sealing ring
Prior art date
Application number
PCT/EP2015/051835
Other languages
German (de)
French (fr)
Inventor
Matthias Greiner
Jochen Aleker
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 WO2015139871A1 publication Critical patent/WO2015139871A1/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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F02M59/442—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 means preventing fuel leakage around pump plunger, e.g. fluid barriers

Definitions

  • the invention is based on a pump, in particular
  • Such a pump in the form of a high-pressure fuel pump and a
  • Fuel injection device is known from DE 10 2009 001 566 AI.
  • This pump has at least one pump element, which in turn has a pump piston driven in a stroke movement.
  • the pump piston is slidably guided in a cylinder bore of a housing part of the pump and limited in the cylinder bore a pump working space.
  • Pump piston protrudes with its end remote from the pump working space from the pump working RAM remote from the end of the cylinder bore.
  • a sealing ring is provided on the protruding from the cylinder bore end portion of the pump piston. The sealing ring serves to mix the pumped by the pump piston fuel with the outside of the
  • Cylinder bore of the housing part existing medium to avoid.
  • the medium present outside the cylinder bore of the housing part is in particular lubricating oil for lubricating a drive region, for example a roller tappet and its support on a cam.
  • the sealing ring has on its inner circumference a sealing lip, with which it bears against the pump piston under prestress.
  • the sealing lip must be elastic to ensure a sufficient sealing function.
  • the sealing lip is subject to a high thermal load as the pump piston becomes hot during operation of the pump.
  • the pump piston becomes hotter during operation of the pump Fuel from the cylinder bore entrained, which hits the sealing lip. In the known pump, it is thus difficult to perform the sealing ring with sufficient thermal resistance and durability. Over the life of the pump can thus lead to wear of the sealing ring and as a result to a mixing of lubricating oil and fuel.
  • the pump according to the invention with the features of claim 1 has the advantage that the thermal load of the sealing ring is reduced and thus reduces its wear and its life can be increased.
  • the embodiment according to claim 2 allows a simple construction of the pump, since no additional component for the scraper ring is required.
  • the embodiment according to claim 3 allows easy attachment of the scraper ring.
  • an advantageous arrangement of the scraper ring is indicated on the holding element.
  • the embodiment according to claim 6 allows easy attachment of the retaining element.
  • the embodiment according to claim 7 allows easy production of the retaining element.
  • the embodiment of claim 8 and 9 allows a good function of the wiper lip of the wiper ring.
  • the embodiment according to claim 10 the function of the wiper lip can be further improved.
  • FIG. 1 shows a pump in a longitudinal section
  • Figure 2 shows a designated II in Figure 1 section of the pump in an enlarged view according to a first embodiment
  • Figure 3 shows the detail II according to a second embodiment. Description of the embodiments
  • the high-pressure fuel pump has at least one pump element 10, which in turn has a pump piston 12 which is driven at least indirectly by a drive shaft 14 in a lifting movement in at least approximately radial direction with respect to the axis of rotation 15 of the drive shaft 14.
  • the drive shaft 14 may be part of the pump or alternatively may also be provided that the pump does not have its own drive shaft and the drive shaft 14 is part of the internal combustion engine.
  • the drive shaft 14 may, for example, a wave of
  • the drive shaft 14 has a cam 16 or eccentric for driving the pump piston 12.
  • the pump has a pump housing, which may be designed in several parts.
  • the pump piston 12 is tightly guided in a cylinder bore 18 of a housing part 20 of the pump wherein the housing part 20 is referred to below as the cylinder head.
  • the pump piston 12 in the cylinder bore 18 defines a pump working space 22.
  • the pump working space 22 has an inlet with an inlet 26, which may be an inlet check valve opening into the pump working space 22 the pump working chamber 22 is filled with the radially inward to the rotational axis 15 of the drive shaft 14 directed suction stroke of the pump piston 12 with fuel.
  • the pump working chamber 22 also has an outlet valve 28, which is for example an outlet check valve opening out of the pump working chamber 22, a connection to a drain 30, which can lead to a high-pressure accumulator 32 and the radially outward from the axis of rotation 15 of the
  • the pump piston 12 is supported via a roller tappet 40 on the cam 16 of the drive shaft 14.
  • the roller tappet 40 has a tappet body 42 in which a roller 44 rolling on the cam 16 is rotatably mounted.
  • Plunger body 42 is acted upon by a spring 46 toward the cam 16, so that the roller 44 during the suction stroke of the pump piston 12 in abutment on
  • the cylinder head 20 has in the region of the cylinder bore 18 to the cam 16 through a
  • Cylinder bore 18 surrounding at least approximately cylindrical
  • the spring 46 is formed as a cylindrical helical compression spring, surrounds the portion 50 of the cylinder head 20 and is supported on the cylinder head 20 from.
  • a sealing ring 52 is provided which surrounds the end region of the pump piston 12 projecting from the cylinder bore 18 on its circumference.
  • the sealing ring 52 is under radial bias with at least one arranged on the inner circumference elastic sealing lip 54 on the pump piston 12 at.
  • the at least one sealing lip 54 preferably has at least in the region of its abutment on
  • Pump piston 12 has a surface with a low coefficient of friction to cause only slight frictional forces during the lifting movement of the pump piston 12.
  • the sealing ring 52 has two or three sealing lips 54 spaced from one another in the direction of the longitudinal axis 13 of the pump piston 12.
  • the sealing ring 52 is made of PTFE, polythetrafluoroethylene, for example.
  • FIG. 2 shows the pump according to a first exemplary embodiment, in which the cylinder head 20 in the section 50 has a bore 58, which adjoins the cylinder bore 18 and has a larger diameter than the cylinder bore
  • the bore 58 forms a receptacle for the sealing ring 52, in which the sealing ring 52 is inserted with radial bias.
  • At least one annular spring 56 may be provided on the sealing ring 52 in order to generate the radial prestressing on the at least one sealing lip 54.
  • a further ring Seen in the direction of the longitudinal axis 13 of the pump piston 12 is facing away from the cylinder bore 18 Side of the sealing ring 52, a further ring provided, which is designed as a scraper ring 60.
  • the scraper ring 60 has on its inner circumference an under voltage on the pump piston 12 abutting wiper lip 62.
  • Wiper ring 60 also has a disk-shaped support ring 64 which does not abut the pump piston 12 with its radially inner edge.
  • the wiper lip 62 is arranged on the side facing away from the sealing ring 52 of the scraper ring 60, is formed with its radially outer edge region on the support ring 64 and is located with its radially inner edge region on the pump piston 12 at. Due to the radial bias of the support ring 64 in the bore 58, the radial bias of the wiper lip 62 on the pump piston 12 is effected.
  • the support ring 64 also the sealing ring 52 is secured in the direction of the longitudinal axis 13 of the pump piston 12 in the bore 58, so that it can not slip out of the bore 58 during operation of the pump.
  • the wiper lip 62 extends at an angle ⁇ of less than 90 ° inclined to the longitudinal axis 13 of the pump piston 12.
  • the wiper lip 62 is inclined at an angle of about 5 ° to 50 °, preferably from about 10 ° to 30 ° to the longitudinal axis 13,
  • the direction of inclination of the wiper lip 62 is such that the wiper lip 62 extends away from the seal ring 52 toward the pump piston 12. This allows a good function of the wiper lip 62, so that only a small amount of lubricant to the sealing ring 52 passes.
  • the scraper ring 60 is made of plastic or metal, for example.
  • the wiper ring 60 has essentially only a Abstreiffunktion for the pump piston 12th
  • FIG. 3 the pump according to a second embodiment is shown, in which case again the sealing ring 52 is provided.
  • the sealing ring 52 is arranged in a sleeve-shaped holding element 74.
  • the holding element 74 has an end region 76, which projects beyond the sealing ring 52 in the direction of the longitudinal axis 13 of the pump piston 12, and which presses onto the portion 50 of FIG
  • Cylinder head 20 is pushed.
  • the end region 76 of the retaining element 74 is fastened on the section 50, for example in a form-locking manner, as latched or by means of a flange, in a force-fit manner, for example by being pressed on, screwed down, glued or welded.
  • a seal is provided between the end portion 76 of the holding member 74 and the portion 50 of the cylinder head 20, a seal is provided.
  • the other end region 78 of the retaining element 74 also projects in the direction of the longitudinal axis 13 of the pump piston 12 beyond the sealing ring 52 and at the end of a scraper ring 80 is formed.
  • the wiper ring 80 has a wiper lip 82 which faces the pump piston 12 and is biased against it.
  • the end region 78 of the retaining element 74 may extend approximately radially to the longitudinal axis 13 of the pump piston 12 toward this and on the inner edge of the scraper ring 80 is formed.
  • the wiper lip 82 extends like the wiper lip 62 of the wiper ring 60 according to the first embodiment at an angle ⁇ to the longitudinal axis 13 inclined, the angle ⁇ is selected as in the first embodiment. It can be provided that the wall thickness a of the retaining element 74 is reduced towards the end of the wiper lip 82 bearing against the pump piston 12.
  • Wiper lip 82 can be tapered at an angle ß, wherein the angle ß may be for example between about 10 ° and about 45 °.
  • the elasticity of the wiper lip 82 can be selectively influenced and a
  • the holding element 74 is made of metal, for example, preferably made of sheet metal and can be made by forming, for example by deep drawing.
  • the retaining element is made of stainless spring steel, for example.
  • the pump piston 12 is made of steel and can with a
  • wear-resistant coating be provided, for example a
  • Carbon coating During operation of the pump may cause wear of the wiper lip 82 of the wiper ring 80, wherein the effect of the wiper lip 82 is maintained by the bias and on
  • the scraper ring 60, 80 is prevented by the pump piston 12 from the outside of the cylinder bore 18 arranged region of lubricant to the sealing ring 52 and into the
  • Cylinder bore 18 is dragged along and mixed with fuel.

Abstract

The pump has at least one pump element (10), which in turn has a pump piston (12) which is driven in reciprocating motion and which is guided in displaceable fashion in a cylinder bore (18) of a housing part (20) of the pump and which delimits a pump working chamber (22) in said cylinder bore. The pump piston (12) projects, by way of its end averted from the pump working chamber (22), out of the cylinder bore (18). The housing part (20) has an at least approximately cylindrical section (50) which surrounds that end region of the cylinder bore (18) which is averted from the pump working chamber (22). On that end region of the pump piston (12) which projects out of the cylinder bore (18) there is arranged a sealing ring (52) which, at its inner circumference, bears by way of a sealing lip (54) against the pump piston (12). The sealing ring (52) is secured in the direction of the longitudinal axis (13) of the pump piston (12) by way of a retaining element (64). As viewed in the direction of the longitudinal axis (13) of the pump piston (12), a stripping ring (60) is arranged on that side of the sealing ring (52) which is averted from the end of the cylinder bore (18), which stripping ring, at its inner circumference, bears by way of a stripping lip (62) against the pump piston (12), and by means of which stripping ring medium which is carried along on the pump piston (12) from the region situated outside the cylinder bore (18) is at least partially stripped off such that it does not pass to the sealing ring (52).

Description

Beschreibung Titel  Description title
Pumpe, insbesondere Kraftstoffhochdruckpumpe für eine Pump, in particular high-pressure fuel pump for one
Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine Fuel injection device of an internal combustion engine
Stand der Technik State of the art
Die Erfindung geht aus von einer Pumpe, insbesondere The invention is based on a pump, in particular
Kraftstoffhochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer High-pressure fuel pump for a fuel injection of a
Brennkraftmaschine nach der Gattung des Anspruchs 1. Internal combustion engine according to the preamble of claim 1.
Eine solche Pumpe in Form einer Kraftstoffhochdruckpumpe und eine Such a pump in the form of a high-pressure fuel pump and a
Kraftstoffeinspritzeinrichtung ist durch die DE 10 2009 001 566 AI bekannt. Diese Pumpe weist wenigstens ein Pumpenelement auf, das wiederum einen einen in einer Hubbewegung angetriebenen Pumpenkolben aufweist. Der Pumpenkolben ist in einer Zylinderbohrung eines Gehäuseteils der Pumpe verschiebbar geführt und begrenzt in der Zylinderbohrung einen Pumpenarbeitsraum. Der Fuel injection device is known from DE 10 2009 001 566 AI. This pump has at least one pump element, which in turn has a pump piston driven in a stroke movement. The pump piston is slidably guided in a cylinder bore of a housing part of the pump and limited in the cylinder bore a pump working space. Of the
Pumpenkolben ragt mit seinem dem Pumpenarbeitsraum abgewandten Ende aus dem dem Pumpenarbeitsram abgewandten Ende der Zylinderbohrung heraus. Auf dem aus der Zylinderbohrung ragenden Endbereich des Pumpenkolbens ist ein Dichtring vorgesehen. Der Dichtring dient dazu eine Vermischung von dem durch den Pumpenkolben geförderten Kraftstoff mit dem außerhalb der Pump piston protrudes with its end remote from the pump working space from the pump working RAM remote from the end of the cylinder bore. On the protruding from the cylinder bore end portion of the pump piston, a sealing ring is provided. The sealing ring serves to mix the pumped by the pump piston fuel with the outside of the
Zylinderbohrung des Gehäuseteils vorhandenen Medium zu vermeiden. Das außerhalb der Zylinderbohrung des Gehäuseteils vorhandene Medium ist insbesondere Schmieröl zur Schmierung eines Antriebsbereichs, beispielsweise einem Rollenstößel und dessen Abstützung an einem Nocken. Der Dichtring weist an seinem Innenumfang eine Dichtlippe auf, mit der er am Pumpenkolben unter Vorspannung anliegt. Die Dichtlippe muss elastisch sein um eine ausreichende Dichtfunktion sicherzustellen. Die Dichtlippe unterliegt eine hohen thermischen Belastung, da der Pumpenkolben beim Betrieb der Pumpe heiß wird. Außerdem wird am Pumpenkolben während des Betriebs der Pumpe heißer Kraftstoff aus der Zylinderbohrung mitgeführt, der auf die Dichtlippe trifft. Bei der bekannten Pumpe ist es somit schwierig den Dichtring mit ausreichender thermischer Beständigkeit und Dauerbeständigkeit auszuführen. Über die Lebensdauer der Pumpe kann es somit zu Verschleiß des Dichtrings kommen und als Folge zu einer Vermischung von Schmieröl und Kraftstoff. Cylinder bore of the housing part existing medium to avoid. The medium present outside the cylinder bore of the housing part is in particular lubricating oil for lubricating a drive region, for example a roller tappet and its support on a cam. The sealing ring has on its inner circumference a sealing lip, with which it bears against the pump piston under prestress. The sealing lip must be elastic to ensure a sufficient sealing function. The sealing lip is subject to a high thermal load as the pump piston becomes hot during operation of the pump. In addition, the pump piston becomes hotter during operation of the pump Fuel from the cylinder bore entrained, which hits the sealing lip. In the known pump, it is thus difficult to perform the sealing ring with sufficient thermal resistance and durability. Over the life of the pump can thus lead to wear of the sealing ring and as a result to a mixing of lubricating oil and fuel.
Offenbarung der Erfindung Disclosure of the invention
Vorteile der Erfindung Advantages of the invention
Die erfindungsgemäße Pumpe mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, dass die thermische Belastung des Dichtrings verringert ist und somit dessen Verschleiß verringert und dessen Lebensdauer erhöht werden. The pump according to the invention with the features of claim 1 has the advantage that the thermal load of the sealing ring is reduced and thus reduces its wear and its life can be increased.
In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und In the dependent claims are advantageous embodiments and
Weiterbildungen der erfindungsgemäßen Pumpe angegeben. Die Ausbildung gemäß Anspruch 2 ermöglicht einen einfachen Aufbau der Pumpe, da kein zusätzliches Bauteil für den Abstreifring erforderlich ist. Die Ausbildung gemäß Anspruch 3 ermöglicht eine einfache Befestigung des Abstreifrings. Im Anspruch 5 ist eine vorteilhafte Anordnung des Abstreifrings am Halteelement angegeben. Die Ausbildung gemäß Anspruch 6 ermöglicht eine einfache Befestigung des Halteelements. Die Ausbildung gemäß Anspruch 7 ermöglicht eine einfache Herstellung des Halteelements. Die Ausbildung gemäß Anspruch 8 und 9 ermöglicht eine gute Funktion der Abstreiflippe des Abstreifrings. Durch die Ausbildung gemäß Anspruch 10 kann die Funktion der Abstreiflippe weiter verbessert werden. Further developments of the pump according to the invention indicated. The embodiment according to claim 2 allows a simple construction of the pump, since no additional component for the scraper ring is required. The embodiment according to claim 3 allows easy attachment of the scraper ring. In claim 5, an advantageous arrangement of the scraper ring is indicated on the holding element. The embodiment according to claim 6 allows easy attachment of the retaining element. The embodiment according to claim 7 allows easy production of the retaining element. The embodiment of claim 8 and 9 allows a good function of the wiper lip of the wiper ring. The embodiment according to claim 10, the function of the wiper lip can be further improved.
Zeichnung drawing
Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Pumpe in einem Längsschnitt, Figur 2 einen in Figur 1 mit II bezeichneten Ausschnitt der Pumpe in vergrößerter Darstellung gemäß einem ersten Ausführungsbeispiel und Figur 3 den Ausschnitt II gemäß einem zweiten Ausführungsbeispiel. Beschreibung der Ausführungsbeispiele Two embodiments of the invention are illustrated in the drawing and explained in more detail in the following description. 1 shows a pump in a longitudinal section, Figure 2 shows a designated II in Figure 1 section of the pump in an enlarged view according to a first embodiment and Figure 3 shows the detail II according to a second embodiment. Description of the embodiments
In Figur 1 ist in vereinfachter Darstellung eine Pumpe gezeigt, die insbesondere eine Kraftstoffhochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine ist. Die Kraftstoffhochdruckpumpe weist wenigstens ein Pumpenelement 10 auf, das wiederum einen Pumpenkolben 12 aufweist, der zumindest mittelbar durch eine Antriebswelle 14 in einer Hubbewegung in zumindest annähernd radialer Richtung bezüglich der Drehachse 15 der Antriebswelle 14 angetrieben wird. Die Antriebswelle 14 kann Teil der Pumpe sein oder alternativ kann auch vorgesehen sein, dass die Pumpe keine eigene Antriebswelle aufweist und die Antriebswelle 14 Teil der Brennkraftmaschine ist. Die Antriebswelle 14 kann dabei beispielsweise eine Welle der 1 shows a simplified illustration of a pump, which is in particular a high-pressure fuel pump for a fuel injection device of an internal combustion engine. The high-pressure fuel pump has at least one pump element 10, which in turn has a pump piston 12 which is driven at least indirectly by a drive shaft 14 in a lifting movement in at least approximately radial direction with respect to the axis of rotation 15 of the drive shaft 14. The drive shaft 14 may be part of the pump or alternatively may also be provided that the pump does not have its own drive shaft and the drive shaft 14 is part of the internal combustion engine. The drive shaft 14 may, for example, a wave of
Brennkraftmaschine sein durch die auch die Gaswechselventile der Internal combustion engine by the gas exchange valves of the
Brennkraftmaschine betätigt werden. Die Antriebswelle 14 weist für den Antrieb des Pumpenkolbens 12 einen Nocken 16 oder Exzenter auf. Internal combustion engine to be operated. The drive shaft 14 has a cam 16 or eccentric for driving the pump piston 12.
Die Pumpe weist ein Pumpengehäuse auf, das mehrteilig ausgebildet sein kann. Der Pumpenkolben 12 ist in einer Zylinderbohrung 18 eines Gehäuseteils 20 der Pumpe dicht geführt wobei das Gehäuseteil 20 nachfolgend als Zylinderkopf bezeichnet wird. Mit seinem der Antriebswelle 14 abgewandten Ende begrenzt der Pumpenkolben 12 in der Zylinderbohrung 18 einen Pumpenarbeitsraum 22. Der Pumpenarbeitsraum 22 weist über ein Einlassventil 24, das ein in den Pumpenarbeitsraum 22 hinein öffnendes Einlassrückschlagventil sein kann, eine Verbindung mit einem Zulauf 26 auf, über den der Pumpenarbeitsraum 22 beim radial nach innen zur Drehachse 15 der Antriebswelle 14 gerichteten Saughub des Pumpenkolbens 12 mit Kraftstoff befüllt wird. Der Pumpenarbeitsraum 22 weist außerdem über ein Auslassventil 28, das beispielsweise ein aus dem Pumpenarbeitsraum 22 heraus öffnendes Auslassrückschlagventil ist, eine Verbindung mit einem Ablauf 30 auf, der zu einem Hochdruckspeicher 32 führen kann und über den beim radial nach außen von der Drehachse 15 der The pump has a pump housing, which may be designed in several parts. The pump piston 12 is tightly guided in a cylinder bore 18 of a housing part 20 of the pump wherein the housing part 20 is referred to below as the cylinder head. With its end facing away from the drive shaft 14, the pump piston 12 in the cylinder bore 18 defines a pump working space 22. The pump working space 22 has an inlet with an inlet 26, which may be an inlet check valve opening into the pump working space 22 the pump working chamber 22 is filled with the radially inward to the rotational axis 15 of the drive shaft 14 directed suction stroke of the pump piston 12 with fuel. The pump working chamber 22 also has an outlet valve 28, which is for example an outlet check valve opening out of the pump working chamber 22, a connection to a drain 30, which can lead to a high-pressure accumulator 32 and the radially outward from the axis of rotation 15 of the
Antriebswelle 14 weg gerichteten Förderhub des Pumpenkolbens 12 Kraftstoff aus dem Pumpenarbeitsraum 22 verdrängt wird. Der Pumpenkolben 12 stützt sich über einen Rollenstößel 40 am Nocken 16 der Antriebswelle 14 ab. Der Rollenstößel 40 weist einen Stößelkörper 42 auf, in dem eine auf dem Nocken 16 abrollende Rolle 44 drehbar gelagert ist. Der Drive shaft 14 directed away delivery stroke of the pump piston 12 fuel from the pump working chamber 22 is displaced. The pump piston 12 is supported via a roller tappet 40 on the cam 16 of the drive shaft 14. The roller tappet 40 has a tappet body 42 in which a roller 44 rolling on the cam 16 is rotatably mounted. Of the
Stößelkörper 42 wird durch eine Feder 46 zum Nocken 16 hin beaufschlagt, so dass die Rolle 44 auch beim Saughub des Pumpenkolbens 12 in Anlage amPlunger body 42 is acted upon by a spring 46 toward the cam 16, so that the roller 44 during the suction stroke of the pump piston 12 in abutment on
Nocken 16 bleibt. Der Pumpenkolben 12 ragt mit seinem dem Cam 16 remains. The pump piston 12 protrudes with his
Pumpenarbeitsraum 22 abgewandten Ende aus der Zylinderbohrung 18 heraus und ist an seinem Ende mit dem Stößelkörper 42 gekoppelt, so dass der Pump working space 22 facing away from the cylinder bore 18 and is coupled at its end to the plunger body 42, so that the
Pumpenkolben 12 ebenfalls durch die Feder 46 beaufschlagt ist. Der Zylinderkopf 20 weist im Bereich der Zylinderbohrung 18 zum Nocken 16 hin einen diePump piston 12 is also acted upon by the spring 46. The cylinder head 20 has in the region of the cylinder bore 18 to the cam 16 through a
Zylinderbohrung 18 umgebenden zumindest annähernd zylinderförmigen Cylinder bore 18 surrounding at least approximately cylindrical
Abschnitt 50 auf. Die Feder 46 ist als zylindrische Schraubendruckfeder ausgebildet, umgibt den Abschnitt 50 des Zylinderkopfs 20 und stützt sich am Zylinderkopf 20 ab. Section 50 on. The spring 46 is formed as a cylindrical helical compression spring, surrounds the portion 50 of the cylinder head 20 and is supported on the cylinder head 20 from.
Es ist ein Dichtring 52 vorgesehen, der den aus der Zylinderbohrung 18 ragenden Endbereich des Pumpenkolbens 12 auf dessen Umfang umgibt. Der Dichtring 52 liegt unter radialer Vorspannung mit wenigstens einer an dessen Innenumfang angeordneten elastischen Dichtlippe 54 am Pumpenkolben 12 an. Die wenigstens eine Dichtlippe 54 weist vorzugsweise zumindest im Bereich ihrer Anlage amA sealing ring 52 is provided which surrounds the end region of the pump piston 12 projecting from the cylinder bore 18 on its circumference. The sealing ring 52 is under radial bias with at least one arranged on the inner circumference elastic sealing lip 54 on the pump piston 12 at. The at least one sealing lip 54 preferably has at least in the region of its abutment on
Pumpenkolben 12 eine Oberfläche mit geringem Reibungskoeffizienten auf, um bei der Hubbewegung des Pumpenkolbens 12 nur geringe Reibungskräfte zu verursachen. Vorzugsweise weist der Dichtring 52 zwei oder drei in Richtung der Längsachse 13 des Pumpenkolbens 12 zueinander beabstandete Dichtlippen 54 auf. Der Dichtring 52 ist beispielsweise aus PTFE, Polythetrafluorethylen, hergestellt. Pump piston 12 has a surface with a low coefficient of friction to cause only slight frictional forces during the lifting movement of the pump piston 12. Preferably, the sealing ring 52 has two or three sealing lips 54 spaced from one another in the direction of the longitudinal axis 13 of the pump piston 12. The sealing ring 52 is made of PTFE, polythetrafluoroethylene, for example.
In Figur 2 ist die Pumpe gemäß einem ersten Ausführungsbeispiel dargestellt, bei dem der Zylinderkopf 20 im Abschnitt 50 eine an die Zylinderbohrung 18 anschließende Bohrung 58 mit größerem Durchmesser als die ZylinderbohrungFIG. 2 shows the pump according to a first exemplary embodiment, in which the cylinder head 20 in the section 50 has a bore 58, which adjoins the cylinder bore 18 and has a larger diameter than the cylinder bore
18 aufweist. Die Bohrung 58 bildet eine Aufnahme für den Dichtring 52, in die der Dichtring 52 mit radialer Vorspannung eingesetzt ist. Am Dichtring 52 kann wenigstens eine Ringfeder 56 vorgesehen sein, um die radiale Vorspannung auf die wenigstens eine Dichtlippe 54 zu erzeugen. In Richtung der Längsachse 13 des Pumpenkolbens 12 gesehen ist auf der der Zylinderbohrung 18 abgewandten Seite des Dichtrings 52 ein weiterer Ring vorgesehen, der als Abstreifring 60 ausgebildet ist. Der Abstreifring 60 weist an seinem Innenumfang eine unter Vorspannung am Pumpenkolben 12 anliegende Abstreiflippe 62 auf. Der 18 has. The bore 58 forms a receptacle for the sealing ring 52, in which the sealing ring 52 is inserted with radial bias. At least one annular spring 56 may be provided on the sealing ring 52 in order to generate the radial prestressing on the at least one sealing lip 54. Seen in the direction of the longitudinal axis 13 of the pump piston 12 is facing away from the cylinder bore 18 Side of the sealing ring 52, a further ring provided, which is designed as a scraper ring 60. The scraper ring 60 has on its inner circumference an under voltage on the pump piston 12 abutting wiper lip 62. Of the
Abstreifring 60 weist außerdem einen scheibenförmigen Stützring 64 auf, der mit seinem radial inneren Rand nicht am Pumpenkolben 12 anliegt. Der AbstreifringWiper ring 60 also has a disk-shaped support ring 64 which does not abut the pump piston 12 with its radially inner edge. The scraper ring
60 ist über seinen Stützring 64 in der Bohrung 58 gehalten, beispielsweise in diese eingepresst oder in eine Ringnut 66 in der Bohrung 58 eingerastet. Die Abstreiflippe 62 ist auf der dem Dichtring 52 abgewandten Seite des Abstreifrings 60 angeordnet, ist mit ihrem radial äußeren Randbereich am Stützring 64 angeformt und liegt mit ihrem radial inneren Randbereich am Pumpenkolben 12 an. Durch die radiale Vorspannung des Stützrings 64 in der Bohrung 58 wird die radiale Vorspannung der Abstreiflippe 62 am Pumpenkolben 12 bewirkt. Durch den Stützring 64 wird außerdem der Dichtring 52 in Richtung der Längsachse 13 des Pumpenkolbens 12 in der Bohrung 58 gesichert, so dass dieser im Betrieb der Pumpe nicht aus der Bohrung 58 herausrutschen kann. 60 is held over its support ring 64 in the bore 58, for example, pressed into this or engaged in an annular groove 66 in the bore 58. The wiper lip 62 is arranged on the side facing away from the sealing ring 52 of the scraper ring 60, is formed with its radially outer edge region on the support ring 64 and is located with its radially inner edge region on the pump piston 12 at. Due to the radial bias of the support ring 64 in the bore 58, the radial bias of the wiper lip 62 on the pump piston 12 is effected. By the support ring 64 also the sealing ring 52 is secured in the direction of the longitudinal axis 13 of the pump piston 12 in the bore 58, so that it can not slip out of the bore 58 during operation of the pump.
Die Abstreiflippe 62 verläuft unter einem Winkel α von weniger als 90° geneigt zur Längsachse 13 des Pumpenkolbens 12. Beispielsweise verläuft die Abstreiflippe 62 unter einem Winkel von etwa 5° bis 50°, vorzugsweise von etwa 10° bis 30° zur Längsachse 13 geneigt, Die Richtung der Neigung der Abstreiflippe 62 ist derart, dass die Abstreiflippe 62 vom Dichtring 52 weg zum Pumpenkolben 12 hin verläuft. Dies ermöglicht eine gute Funktion der Abstreiflippe 62, so dass nur wenig Schmiermedium zum Dichtring 52 gelangt. Der Abstreifring 60 ist beispielsweise aus Kunststoff oder Metall hergestellt. Der Abstreifring 60 hat im wesentlichen nur eine Abstreiffunktion für das am Pumpenkolben 12 The wiper lip 62 extends at an angle α of less than 90 ° inclined to the longitudinal axis 13 of the pump piston 12. For example, the wiper lip 62 is inclined at an angle of about 5 ° to 50 °, preferably from about 10 ° to 30 ° to the longitudinal axis 13, The direction of inclination of the wiper lip 62 is such that the wiper lip 62 extends away from the seal ring 52 toward the pump piston 12. This allows a good function of the wiper lip 62, so that only a small amount of lubricant to the sealing ring 52 passes. The scraper ring 60 is made of plastic or metal, for example. The wiper ring 60 has essentially only a Abstreiffunktion for the pump piston 12th
mitgeschleppte Schmiermedium und keine Dichtfunktion. entrained lubricant and no sealing function.
In Figur 3 ist die Pumpe gemäß einem zweiten Ausführungsbeispiel dargestellt wobei hier wiederum der Dichtring 52 vorgesehen ist. Der Dichtring 52 ist in einem buchsenförmigen Halteelement 74 angeordnet. Das Halteelement 74 weist einen in Richtung der Längsachse 13 des Pumpenkolbens 12 über den Dichtring 52 hinausragenden Endbereich 76 auf, der auf den Abschnitt 50 des In Figure 3, the pump according to a second embodiment is shown, in which case again the sealing ring 52 is provided. The sealing ring 52 is arranged in a sleeve-shaped holding element 74. The holding element 74 has an end region 76, which projects beyond the sealing ring 52 in the direction of the longitudinal axis 13 of the pump piston 12, and which presses onto the portion 50 of FIG
Zylinderkopfs 20 aufgeschoben ist. Der Endbereich 76 des Halteelements 74 ist auf dem Abschnitt 50 befestigt, beispielsweise formschlüssig, wie verrastet oder mittels einer Bördelung, kraftschlüssig, beispielsweise aufgepresst, verschraubt, verklebt oder verschweißt. Zwischen dem Endbereich 76 des Halteelements 74 und dem Abschnitt 50 des Zylinderkopfs 20 ist eine Abdichtung vorgesehen. Der andere Endbereich 78 des Halteelements 74 ragt ebenfalls in Richtung der Längsachse 13 des Pumpenkolbens 12 über den Dichtring 52 hinaus und an dessen Ende ist ein Abstreifring 80 ausgebildet. Der Abstreifring 80 weist eine dem Pumpenkolben 12 zugewandte und an diesem unter Vorspannung anliegende Abstreiflippe 82 auf. Der Endbereich 78 des Halteelements 74 kann etwa radial zur Längsachse 13 des Pumpenkolbens 12 zu diesem hin verlaufen und an dessen innerem Rand ist der Abstreifring 80 ausgebildet. Cylinder head 20 is pushed. The end region 76 of the retaining element 74 is fastened on the section 50, for example in a form-locking manner, as latched or by means of a flange, in a force-fit manner, for example by being pressed on, screwed down, glued or welded. Between the end portion 76 of the holding member 74 and the portion 50 of the cylinder head 20, a seal is provided. The other end region 78 of the retaining element 74 also projects in the direction of the longitudinal axis 13 of the pump piston 12 beyond the sealing ring 52 and at the end of a scraper ring 80 is formed. The wiper ring 80 has a wiper lip 82 which faces the pump piston 12 and is biased against it. The end region 78 of the retaining element 74 may extend approximately radially to the longitudinal axis 13 of the pump piston 12 toward this and on the inner edge of the scraper ring 80 is formed.
Die Abstreiflippe 82 verläuft wie die Abstreiflippe 62 des Abstreifrings 60 gemäß dem ersten Ausführungsbeispiel unter einem Winkel α zur Längsachse 13 geneigt, wobei der Winkel α wie beim ersten Ausführungsbeispiel gewählt ist. Es kann vorgesehen sein, dass sich die Wandstärke a des Halteelements 74 zum am Pumpenkolben 12 anliegenden Ende der Abstreiflippe 82 hin verringert. DieThe wiper lip 82 extends like the wiper lip 62 of the wiper ring 60 according to the first embodiment at an angle α to the longitudinal axis 13 inclined, the angle α is selected as in the first embodiment. It can be provided that the wall thickness a of the retaining element 74 is reduced towards the end of the wiper lip 82 bearing against the pump piston 12. The
Abstreiflippe 82 kann dabei unter einem Winkel ß spitz zulaufen, wobei der Winkel ß beispielsweise zwischen etwa 10° und etwa 45° betragen kann. Durch die Länge des Hebelarms b der Abstreiflippe 82 und/oder deren Wandstärke a kann die Elastizität der Abstreiflippe 82 gezielt beeinflusst werden und eine Wiper lip 82 can be tapered at an angle ß, wherein the angle ß may be for example between about 10 ° and about 45 °. By the length of the lever arm b of the wiper lip 82 and / or the wall thickness a, the elasticity of the wiper lip 82 can be selectively influenced and a
erforderliche Vorspannung der Abstreiflippe 82 erzielt werden. required bias of the wiper lip 82 can be achieved.
Das Halteelement 74 ist beispielsweise aus Metall hergestellt, vorzugsweise aus Blech und kann umformend, beispielsweise durch Tiefziehen, hergestellt sein. Das Halteelement ist beispielsweise aus rostfreiem Federstahl hergestellt. Der Pumpenkolben 12 ist aus Stahl hergestellt und kann mit einer The holding element 74 is made of metal, for example, preferably made of sheet metal and can be made by forming, for example by deep drawing. The retaining element is made of stainless spring steel, for example. The pump piston 12 is made of steel and can with a
verschleißbeständigen Beschichtung versehen sein, beispielsweise einer wear-resistant coating be provided, for example a
Kohlenstoffbeschichtung. Während des Betriebs der Pumpe kann es zu einem Verschleiß der Abstreiflippe 82 des Abstreifrings 80 kommen, wobei die Wirkung der Abstreiflippe 82 durch deren Vorspannung erhalten bleibt und am Carbon coating. During operation of the pump may cause wear of the wiper lip 82 of the wiper ring 80, wherein the effect of the wiper lip 82 is maintained by the bias and on
Pumpenkolben 12 durch dessen Beschichtung kein Verschleiß auftritt. Pump piston 12 through the coating no wear occurs.
Beim Betrieb der Pumpe wird durch den Pumpenkolben 12 Kraftstoff gefördert, der im Pumpenarbeitsraum 22 vorhanden ist und der infolge des erforderlichen Spiels zwischen dem Pumpenkolben 12 und der Zylinderbohrung 18 und des im Pumpenarbeitsraum 22 herrschenden hohen Drucks auch aus der Zylinderbohrung 18 zum Nocken 16 hin austreten kann. Im Bereich des Nockens 16 ist Schmieröl vorhanden, das im Schmierölkreislauf der Brennkraftmaschine zirkuliert. Durch den Dichtring 52 wird sowohl die Leckage von Kraftstoff aus der Zylinderbohrung 18 in den Schmierölkreislauf als auch die Leckage von During operation of the pump 12 fuel is pumped through the pump piston, which is present in the pump working chamber 22 and due to the required clearance between the pump piston 12 and the cylinder bore 18 and the pressure prevailing in the pump working chamber 22 high pressure from the Cylinder bore 18 can escape to the cam 16 out. In the region of the cam 16 lubricating oil is present, which circulates in the lubricating oil circuit of the internal combustion engine. By the sealing ring 52, both the leakage of fuel from the cylinder bore 18 in the lubricating oil circuit and the leakage of
Schmieröl aus dem Schmierölkreislauf in die Zylinderbohrung 18 verhindert oder zumindest gering gehalten. Durch den Abstreifring 60, 80 wird verhindert, dass durch den Pumpenkolben 12 aus dem außerhalb der Zylinderbohrung 18 angeordneten Bereich Schmiermedium zum Dichtring 52 und in die Lubricating oil from the lubricating oil circuit prevented in the cylinder bore 18 or at least kept low. By the scraper ring 60, 80 is prevented by the pump piston 12 from the outside of the cylinder bore 18 arranged region of lubricant to the sealing ring 52 and into the
Zylinderbohrung 18 mitgeschleppt wird und sich mit Kraftstoff vermischt. Cylinder bore 18 is dragged along and mixed with fuel.

Claims

Ansprüche claims
1. Pumpe, insbesondere Kraftstoffhochdruckpumpe für eine 1. pump, in particular high-pressure fuel pump for a
Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine, mit wenigstens einem Pumpenelement (10), das einen in einer Hubbewegung angetriebenen Fuel injection device of an internal combustion engine, having at least one pump element (10), which is driven in a lifting movement
Pumpenkolben (12) aufweist, der in einer Zylinderbohrung (18) eines Pump piston (12) which in a cylinder bore (18) of a
Gehäuseteils (20) der Pumpe verschiebbar geführt ist und in dieser einen Pumpenarbeitsraum (22) begrenzt, wobei der Pumpenkolben (12) mit seinem dem Pumpenarbeitsraum (22) abgewandten Ende aus der Zylinderbohrung (18) herausragt, wobei auf dem aus der Zylinderbohrung (18) ragenden Endbereich des Pumpenkolbens (12) ein Dichtring (52) angeordnet ist, der mit seinem Housing part (20) of the pump is displaceably guided and limited in this a pump working space (22), wherein the pump piston (12) with its the pump working space (22) facing away from the cylinder bore (18) protrudes, wherein on the from the cylinder bore (18 ) projecting end portion of the pump piston (12), a sealing ring (52) is arranged, with its
Innenumfang mit wenigstens einer Dichtlippe (54) am Pumpenkolben (12) anliegt, wobei der Dichtring (52) durch ein Halteelement (64;74) in Richtung der Inner circumference with at least one sealing lip (54) on the pump piston (12) is applied, wherein the sealing ring (52) by a holding element (64; 74) in the direction of
Längsachse (13) des Pumpenkolbens (12) gesichert ist, dadurch gekennzeichnet, dass in Richtung der Längsachse (13) des Pumpenkolbens (12) gesehen auf der dem Ende der Zylinderbohrung (18) abgewandten Seite des Dichtrings (52) ein Abstreifring (60;80) angeordnet ist, der an seinem Innenumfang mit einer Longitudinal axis (13) of the pump piston (12) is secured, characterized in that in the direction of the longitudinal axis (13) of the pump piston (12) seen on the end of the cylinder bore (18) facing away from the sealing ring (52) a scraper ring (60; 80) is arranged, which at its inner circumference with a
Abstreiflippe (62;82) am Pumpenkolben (12) anliegt und durch den am Wiper lip (62; 82) rests against the pump piston (12) and through the on
Pumpenkolben (12) aus dem außerhalb der Zylinderbohrung (18) liegenden Bereich mitgeführtes Medium zumindest teilweise abgestreift wird, so dass dieses nicht zum Dichtring (52) gelangt. Pump piston (12) from the outside of the cylinder bore (18) lying region entrained medium is at least partially stripped so that it does not reach the sealing ring (52).
2. Pumpe nach Anspruch 1, dadurch gekennzeichnet, dass der Abstreifring (60;80) einstückig mit dem Halteement (64;74) für den Dichtring (52) ausgebildet ist. 2. Pump according to claim 1, characterized in that the scraper ring (60; 80) is formed integrally with the retaining element (64; 74) for the sealing ring (52).
3. Pumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Abstreifring (60) einen radial elastischen Stützring (64) aufweist, an dem die Abstreiflippe (62) angeformt ist und der in einer Aufnahme (58) des Pumpengehäuseteils (20) unter radialer Vorspannung gehalten ist. 3. Pump according to claim 1 or 2, characterized in that the wiper ring (60) has a radially elastic support ring (64) on which the wiper lip (62) is integrally formed and in a receptacle (58) of the pump housing part (20) below radial bias is maintained.
4. Pumpe nach Anspruch 3, dadurch gekennzeichnet, dass der Stützring (64) in der Aufnahme (58) eingerastet ist. 4. Pump according to claim 3, characterized in that the support ring (64) is engaged in the receptacle (58).
5. Pumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das 5. Pump according to claim 1 or 2, characterized in that the
Halteelement (74) buchsenförmig ausgebildet ist, dass der Dichtring (52) im Halteelement (74) angeordnet ist und dass die Abstreiflippe (82) an einem in axialer Richtung über das Dichtelement (52) hinausragenden Endbereich (78) des Halteelements (74) ausgebildet ist. Retaining element (74) is formed sleeve-shaped, that the sealing ring (52) in the holding element (74) is arranged and that the wiper lip (82) on an axially beyond the sealing element (52) protruding end portion (78) of the holding element (74) is.
6. Pumpe nach Anspruch 5, dadurch gekennzeichnet, dass das Halteelement (74) einen in axialer Richtung auf der dem Abstreifring (80) gegenüberliegenden Seite über den Dichtring (52) hinausragenden Endbereich (76) aufweist, über den das Halteelement (74) auf einem die Zylinderbohrung (18) umgebenden Abschnitt (50) des Pumpengehäuseteils (20) befestigt ist. 6. Pump according to claim 5, characterized in that the holding element (74) in the axial direction on the scraper ring (80) opposite side on the sealing ring (52) protruding end portion (76), via which the holding element (74) a cylinder bore (18) surrounding portion (50) of the pump housing part (20) is fixed.
7. Pumpe nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass das 7. Pump according to claim 5 or 6, characterized in that the
Halteelement (74) aus Metall hergestellt ist, vorzugsweise aus dünnwandigem Blech. Holding element (74) is made of metal, preferably made of thin-walled sheet metal.
8. Pumpe nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Abstreiflippe (62;82) geneigt zur Längsachse (13) des Pumpenkolbens (12) verläuft, derart, dass die Abstreiflippe (62;82) vom Dichtring (52) weg zum Pumpenkolben (12) hin verläuft. 8. Pump according to one of the preceding claims, characterized in that the wiper lip (62; 82) extends inclined to the longitudinal axis (13) of the pump piston (12), such that the wiper lip (62; 82) away from the sealing ring (52) Pump piston (12) runs out.
9. Pumpe nach Anspruch 8, dadurch gekennzeichnet, dass die Abstreiflippe (62) unter einem Winkel α von etwa 5° bis 50°, vorzugsweise etwa 10° bis 30° geneigt zur Längsachse (13) des Pumpenkolbens (12) verläuft. 9. Pump according to claim 8, characterized in that the wiper lip (62) at an angle α of about 5 ° to 50 °, preferably about 10 ° to 30 ° inclined to the longitudinal axis (13) of the pump piston (12).
10. Pumpe nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Abstreiflippe (62;82) des Abstreifrings (60;80) zu ihrem am 10. Pump according to one of the preceding claims, characterized in that the wiper lip (62; 82) of the wiper ring (60; 80) to its on
Pumpenkolben (12) anliegenden Ende hin spitz zuläuft. Pump piston (12) adjacent end pointed.
PCT/EP2015/051835 2014-03-19 2015-01-29 Pump, in particular high-pressure fuel pump for a fuel injection device of an internal combustion engine WO2015139871A1 (en)

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DE102014205105.3A DE102014205105A1 (en) 2014-03-19 2014-03-19 Pump, in particular high-pressure fuel pump for a fuel injection device of an internal combustion engine
DE102014205105.3 2014-03-19

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10010524A1 (en) * 2000-03-07 2001-09-27 Freudenberg Carl Fa Scraper with integral seal has first sealing lip directed towards space to be sealed, scraper lip directed away from this space and three more sealing lips resting against surfaces of scraper seating which form pressure relief valve
EP1284367A1 (en) * 2000-04-18 2003-02-19 Toyota Jidosha Kabushiki Kaisha High-pressure fuel pump
EP1394452A1 (en) * 2001-06-04 2004-03-03 Nok Corporation Sealing device
EP1739305A1 (en) * 2004-04-13 2007-01-03 NOK Corporation Plunger seal for pump
EP1892444A1 (en) * 2005-06-14 2008-02-27 NOK Corporation Lip type seal
EP2620633A1 (en) * 2012-01-30 2013-07-31 Delphi Technologies Holding S.à.r.l. Pump head for a fuel pump

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009001566A1 (en) 2009-03-16 2010-09-23 Robert Bosch Gmbh High pressure pump for common rail injection system of internal combustion engine of e.g. passenger car, has cylinder head element, where membrane bellows are closely attached to section of cylinder head element

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10010524A1 (en) * 2000-03-07 2001-09-27 Freudenberg Carl Fa Scraper with integral seal has first sealing lip directed towards space to be sealed, scraper lip directed away from this space and three more sealing lips resting against surfaces of scraper seating which form pressure relief valve
EP1284367A1 (en) * 2000-04-18 2003-02-19 Toyota Jidosha Kabushiki Kaisha High-pressure fuel pump
EP1394452A1 (en) * 2001-06-04 2004-03-03 Nok Corporation Sealing device
EP1739305A1 (en) * 2004-04-13 2007-01-03 NOK Corporation Plunger seal for pump
EP1892444A1 (en) * 2005-06-14 2008-02-27 NOK Corporation Lip type seal
EP2620633A1 (en) * 2012-01-30 2013-07-31 Delphi Technologies Holding S.à.r.l. Pump head for a fuel pump

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