WO2016142072A1 - High-pressure fuel pump, in particular for a fuel injection device of an internal combustion engine - Google Patents

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

Info

Publication number
WO2016142072A1
WO2016142072A1 PCT/EP2016/050010 EP2016050010W WO2016142072A1 WO 2016142072 A1 WO2016142072 A1 WO 2016142072A1 EP 2016050010 W EP2016050010 W EP 2016050010W WO 2016142072 A1 WO2016142072 A1 WO 2016142072A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
pump piston
housing part
piston
receptacle
Prior art date
Application number
PCT/EP2016/050010
Other languages
German (de)
French (fr)
Inventor
Markus Schetter
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 WO2016142072A1 publication Critical patent/WO2016142072A1/en

Links

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
    • 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
    • F02M59/44—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0408—Pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0448—Sealing means, e.g. for shafts or housings

Definitions

  • High-pressure fuel pump in particular for a fuel injection device of an internal combustion engine
  • the invention relates to a high-pressure fuel pump, in particular for a fuel injection device of an internal combustion engine according to the preamble of claim 1.
  • Such a high-pressure fuel pump is known from DE 10 2009 000 859 AI.
  • This high-pressure fuel pump has a housing part in which a pump piston is displaceably guided in a cylinder bore. With its first end region arranged in the cylinder bore, the pump piston delimits a pump working space and protrudes with its opposite second end region out of the cylinder bore. Between the second end portion and the housing part, a sealing element is arranged, which is secured to the housing part by means of a holding element in the form of a presser.
  • the second end portion of the pump piston is connected to a plunger, for example, a roller tappet, via which the pump piston is supported on a cam of a drive shaft, via which the pump piston is driven in a lifting movement.
  • the plunger is secured by means of a securing ring on the housing part such that the plunger and together with this the pump piston can perform the required stroke, but falling out of the pump piston is prevented from the cylinder bore.
  • the construction and assembly of the high-pressure fuel pump is complicated, since both the retaining element and the retaining ring must be made and assembled. This also leads to high production costs of the high-pressure fuel pump. Disclosure of the invention
  • Claim 1 has the advantage that it is easier and thus less expensive to manufacture and assemble, since only the retaining element is required, which holds both the sealing element and the pump piston in
  • Housing secures.
  • FIG. 1 shows a pump in a longitudinal section
  • Figure 2 shows a designated in Figure 1 with II section of
  • Figure 3 is a holding element in a perspective view.
  • the high-pressure fuel pump has at least one pump element 10 which, in turn, has a pump piston 12, which is at least indirectly connected by a drive shaft 14 in a lifting movement in an upward direction. at least approximately radial direction with respect to the axis of rotation 15 of the drive shaft 14 is driven.
  • 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 be, for example, a shaft of the internal combustion engine through which the gas exchange valves of the internal combustion engine are actuated.
  • 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 With its first end region remote from the drive shaft 14, the pump piston 12 delimits a pump working chamber 22 in the cylinder bore 18.
  • the pump working chamber 22 has an inlet valve 24, which can be an inlet check valve opening into the pump working chamber 22 or an electrically, in particular electromagnetically controlled valve Connection with a fuel delivery inlet 26, via which the pump working chamber 22 is filled at the radially inwardly to the rotational axis 15 of the drive shaft 14 directed suction stroke of the pump piston 12 with fuel.
  • the fuel delivery inlet 26 is fed, for example, by a feed pump 27, is conveyed by the fuel from a fuel tank 25.
  • 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 drive shaft 14 away pumping stroke of the pump piston 12 fuel is displaced from the pump working chamber 22.
  • the pump piston 12 is supported via a roller tappet 40 on the cam 16 of the
  • 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 towards the cam 16 so that the roller 44 remains in contact with the cam 16 even during the suction stroke of the pump piston 12.
  • the pump piston 12 protrudes with its the pump working space 22 remote from the second end portion of the cylinder bore 18 and is coupled at its end to the plunger body 42, so that the pump piston 12 is also acted upon by the spring 46.
  • the pump piston 12 may have at its projecting from the cylinder bore 18 end a stepped piston diameter 45 in diameter.
  • the spring is supported by a spring plate 47 on the plunger body 42, wherein the spring plate 47 has a central opening 48 whose diameter is smaller than the diameter of the piston foot 45. About the spring plate 47 and this against the plunger body 42 pushing spring 46 is the Pump piston 12 via its piston 45 with the foot
  • the cylinder head 20 has in the region of the cylinder bore 18 to the cam 16 toward a cylinder bore 18 surrounding at least approximately cylindrical portion 50.
  • 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 protruding from the cylinder bore 18 end portion of the pump piston 12 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 a surface with a low coefficient of friction, at least in the region of its contact with the pump piston 12, in order 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, polytetrafluoroethylene, for example.
  • the portion 50 of the cylinder head 20 has at its end to the cylinder bore 18 at least approximately coaxial bore 58 which has a larger diameter than the cylinder bore 18 and which forms a receptacle for the sealing ring 52.
  • an annular shoulder 60 is formed at the transition from the bore 58 to the cylinder bore 18.
  • the sealing ring 52 is in the receptacle 58 in Rieh- tion of the longitudinal axis 13 of the pump piston 12 is secured by a retaining element 64.
  • the holding element 64 shown in Figure 3 is sleeve-shaped, which has a closed ring 66, of which in the direction of the longitudinal axis 13 of the pump piston 12 at least one, preferably a plurality, for example as shown in Figure 3 three distributed over the circumference of the ring 66 arranged Support arms 68 protrude. At the end facing away from the ring 66 of each support arm 68 a approximately radially to the longitudinal axis 13 to the pump piston 12 projecting retaining web 70 is arranged. The pump piston 12 facing edge of each retaining web 70 is formed in a circular section. The retaining webs 70 are movable in the radial direction with respect to the longitudinal axis 13 by elastic deformation of the retaining arms 68.
  • a radially outwardly projecting latching lug 72 is arranged on each of these.
  • a recess is provided for each latching lug 72, wherein the recess is preferably formed by an annular groove 74.
  • Snap locking lugs 72 in the annular groove 74 are at their near the ring 66 lying end portions in which the locking lugs 72 are arranged, relatively stiff, so that after the engagement of the locking lugs 72 in the annular groove 74 a secure fixation of the retaining element 64 is reached.
  • the pump piston 12 has in its outside of the receptacle 58 arranged second end portion on a diameter reduction, through which an annular away from the receptacle 58 annular shoulder 76 is formed on the pump piston 12.
  • the holding arms 68 of the holding element 64 are arranged in their non-elastically deformed state such that the edges of their holding webs 70 are arranged on a diameter dl which is only slightly larger than the smaller diameter d of the second end region of the pump piston 12 and the is smaller than the larger diameter D of the pump piston 12.
  • the sealing ring 52 is inserted into the receptacle 58, then the retaining element 64 is inserted into the receptacle 58 until this with its detent nose 72 is engaged in the annular groove 74.
  • the pump piston 12 is connected to the plunger body 42 and the pump piston 12 is preceded by its first end portion by the holding member 64 and the sealing ring 52nd
  • the retaining arms 68 of the retaining element 64 pivot when elastically deformed when the pump piston 12 is pushed through, and when the reduced-diameter region of the pump piston 12 is arranged between them, the retaining arms 68 again pivot radially inwards toward the pump piston 12.
  • the pump piston 12 and with this the plunger body 42 can then no longer be pulled out of the cylinder bore 18, since in this case the holding webs 70 of the support arms 68 come to rest on the annular shoulder 76 of the pump piston 12.
  • the holding element 64 is formed in one piece and may be made of plastic, for example in an injection molding process. Alternatively, the holding member 64 may be made of metal, in particular of sheet metal by forming.
  • the pump piston 12 is driven in a lifting movement.
  • the annular shoulder 76 of the pump piston 12 and the retaining webs 70 of the support arms 68 of the support member 64 are spaced apart in the direction of the longitudinal axis 13 of the pump piston 12 so that the pump piston 12 can perform the required stroke between its bottom dead center and top dead center without the Holding webs 70 come to the annular shoulder 76 to the plant.
  • the holding element 64 is not fixed in the receptacle 58 of the housing part 20 by means of a latching connection but via a thread or a press connection. Furthermore, it may alternatively be provided that the holding element 64 is not fixed in the receptacle 58 but on the outer casing of the portion 50 of the housing part 20, for example by means of a latching, pressing or threaded connection.

Landscapes

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

Abstract

The pump has a housing part (20) in which a pump piston (12) is guided so as to carry out a stroke movement in a cylinder bore (18). The first end region of the pump piston delimits a pump working chamber (22), said first end region being arranged in the cylinder bore (18), and the opposite second end region protrudes out of the cylinder bore (18). A seal element (52) is arranged between the second end region of the pump piston (12) and the housing part (20), said seal element being secured in a receiving area (58) of the housing part (20) by means of a retaining element (64). The pump piston (12) is secured at least indirectly on the housing part (20), thereby allowing the required stroke movement, and the pump piston (12) is secured at least indirectly on the housing part (20) by means of the retaining element (64).

Description

Beschreibung Titel  Description title
Kraftstoffhochdruckpumpe, insbesondere für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine  High-pressure fuel pump, in particular for a fuel injection device of an internal combustion engine
Stand der Technik State of the art
Die Erfindung geht aus von einer Kraftstoffhochdruckpumpe, insbesondere für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine nach der Gattung des Anspruchs 1. The invention relates to a high-pressure fuel pump, in particular for a fuel injection device of an internal combustion engine according to the preamble of claim 1.
Eine solche Kraftstoffhochdruckpumpe ist durch die DE 10 2009 000 859 AI bekannt. Diese Kraftstoffhochdruckpumpe weist ein Gehäuseteil auf, in dem in einer Zylinderbohrung ein Pumpenkolben verschiebbar geführt ist. Der Pumpenkolben begrenzt mit seinem in der Zylinderbohrung angeordneten ersten Endbereich einen Pumpenarbeitsraum und ragt mit seinem entgegengesetzten zweiten Endbereich aus der Zylinderbohrung heraus. Zwischen dem zweiten Endbereich und dem Gehäuseteil ist ein Dichtelement angeordnet, das am Gehäuseteil mittels eines Halteelements in Form eines Presstellers gesichert ist. Der zweite Endbereich des Pumpenkolbens ist mit einem Stößel verbunden, beispielsweise einem Rollenstößel, über den sich der Pumpenkolben an einem Nocken einer Antriebswelle abstützt, über die der Pumpenkolben in einer Hubbewegung angetrieben wird. Der Stößel ist mittels eines Sicherungsrings am Gehäuseteil derart gesichert, dass der Stößel und zusammen mit diesem der Pumpenkolben den erforderlichen Hub ausführen kann, jedoch ein Herausfallen des Pumpenkolbens aus der Zylinderbohrung verhindert ist. Der Aufbau und die Montage der Kraftstoffhochdruckpumpe ist aufwendig, da sowohl das Halteelement als auch der Sicherungsring hergestellt und montiert werden müssen. Dies führt auch zu hohen Herstellungskosten der Kraftstoffhochdruckpumpe. Offenbarung der Erfindung Such a high-pressure fuel pump is known from DE 10 2009 000 859 AI. This high-pressure fuel pump has a housing part in which a pump piston is displaceably guided in a cylinder bore. With its first end region arranged in the cylinder bore, the pump piston delimits a pump working space and protrudes with its opposite second end region out of the cylinder bore. Between the second end portion and the housing part, a sealing element is arranged, which is secured to the housing part by means of a holding element in the form of a presser. The second end portion of the pump piston is connected to a plunger, for example, a roller tappet, via which the pump piston is supported on a cam of a drive shaft, via which the pump piston is driven in a lifting movement. The plunger is secured by means of a securing ring on the housing part such that the plunger and together with this the pump piston can perform the required stroke, but falling out of the pump piston is prevented from the cylinder bore. The construction and assembly of the high-pressure fuel pump is complicated, since both the retaining element and the retaining ring must be made and assembled. This also leads to high production costs of the high-pressure fuel pump. Disclosure of the invention
Vorteile der Erfindung Die erfindungsgemäße Kraftstoffhochdruckpumpe mit den Merkmalen gemäßADVANTAGES OF THE INVENTION The high-pressure fuel pump according to the invention with the features according to FIG
Anspruch 1 hat demgegenüber den Vorteil, dass diese einfacher und damit kostengünstiger herstellbar und montierbar ist, da nur das Halteelement erforderlich ist, das sowohl das Dichtelement hält als auch den Pumpenkolben im Claim 1 has the advantage that it is easier and thus less expensive to manufacture and assemble, since only the retaining element is required, which holds both the sealing element and the pump piston in
Gehäuseteil sichert. Housing secures.
In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Kraftstoffhochdruckpumpe angegeben. In den Ansprüchen 2 und 3 ist eine konstruktiv einfache Ausbildung des Halteelements angegeben und im Anspruch 4 ist eine konstruktiv einfache Ausbildung des Pumpenkolbens angegeben um ein Zusammenwirken des Halteelements mit diesem zu ermöglichen. Die Ausbildungen gemäß den Ansprüchen 6 und 7 ermöglichen eine einfache Befestigung des Halteelements am Gehäuseteil. Die Ausbildung gemäß Anspruch 8 ermöglicht eine robuste Ausführung der wenigstens einen Rastnase des Halteelements. In the dependent claims advantageous refinements and developments of the high-pressure fuel pump according to the invention are given. In claims 2 and 3, a structurally simple design of the retaining element is specified and in claim 4 is a structurally simple design of the pump piston indicated to allow interaction of the retaining element with this. The embodiments according to claims 6 and 7 allow easy attachment of the retaining element on the housing part. The embodiment according to claim 8 enables a robust embodiment of the at least one latching lug of the holding element.
Zeichnung drawing
Ein Ausführungsbeispiel der Erfindung ist 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 derAn embodiment of the invention is 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 in Figure 1 with II section of
Pumpe in vergrößerter Darstellung und Figur 3 ein Halteelement in perspektivischer Darstellung. Pump in an enlarged view and Figure 3 is a holding element in a perspective view.
Beschreibung des Ausführungsbeispiels Description of the embodiment
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 zu- mindest 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 An- triebswelle 14 kann dabei beispielsweise eine Welle der Brennkraftmaschine sein durch die auch die Gaswechselventile der Brennkraftmaschine betätigt werden. Die Antriebswelle 14 weist für den Antrieb des Pumpenkolbens 12 einen Nocken 16 oder Exzenter auf. 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 at least indirectly connected by a drive shaft 14 in a lifting movement in an upward direction. at least approximately radial direction with respect to the axis of rotation 15 of the drive shaft 14 is driven. 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 be, for example, a shaft of the internal combustion engine through which the gas exchange valves of the internal combustion engine are actuated. 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 ersten Endbereich 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 oder ein elektrisch, insbesondere elektromagnetisch gesteuertes Ventil sein kann, eine Verbindung mit einem Kraftstoffförderzulauf 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 Kraftstoffförderzulauf 26 wird beispielsweise von einer Förderpumpe 27 gespeist, durch die Kraftstoff aus einem Kraftstoffvorratsbehälter 25 gefördert 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 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 derThe 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 first end region remote from the drive shaft 14, the pump piston 12 delimits a pump working chamber 22 in the cylinder bore 18. The pump working chamber 22 has an inlet valve 24, which can be an inlet check valve opening into the pump working chamber 22 or an electrically, in particular electromagnetically controlled valve Connection with a fuel delivery inlet 26, via which the pump working chamber 22 is filled at the radially inwardly to the rotational axis 15 of the drive shaft 14 directed suction stroke of the pump piston 12 with fuel. The fuel delivery inlet 26 is fed, for example, by a feed pump 27, is conveyed by the fuel from a fuel tank 25. 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 drive shaft 14 away pumping stroke of the pump piston 12 fuel is displaced from the pump working chamber 22. The pump piston 12 is supported via a roller tappet 40 on the cam 16 of the
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 from. 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 am No- cken 16 bleibt. Der Pumpenkolben 12 ragt mit seinem dem Pumpenarbeitsraum 22 abgewandten zweiten Endbereich aus der Zylinderbohrung 18 heraus und ist an seinem Ende mit dem Stößelkörper 42 gekoppelt, so dass der Pumpenkolben 12 ebenfalls durch die Feder 46 beaufschlagt ist. Der Pumpenkolben 12 kann an seinem aus der Zylinderbohrung 18 ragenden Ende einen im Durchmesser abgesetzten Kolbenfuß 45 aufweisen. Die Feder stützt sich über einen Federteller 47 am Stößelkörper 42 ab, wobei der Federteller 47 eine zentrale Öffnung 48 aufweist, deren Durchmesser kleiner ist als der Durchmesser des Kolbenfußes 45. Über den Federteller 47 und die diesen gegen den Stößelkörper 42 drückende Feder 46 ist der Pumpenkolben 12 über seinen Kolbenfuß 45 mit dem Plunger body 42 is acted upon by a spring 46 towards the cam 16 so that the roller 44 remains in contact with the cam 16 even during the suction stroke of the pump piston 12. The pump piston 12 protrudes with its the pump working space 22 remote from the second end portion of the cylinder bore 18 and is coupled at its end to the plunger body 42, so that the pump piston 12 is also acted upon by the spring 46. The pump piston 12 may have at its projecting from the cylinder bore 18 end a stepped piston diameter 45 in diameter. The spring is supported by a spring plate 47 on the plunger body 42, wherein the spring plate 47 has a central opening 48 whose diameter is smaller than the diameter of the piston foot 45. About the spring plate 47 and this against the plunger body 42 pushing spring 46 is the Pump piston 12 via its piston 45 with the foot
Stößelkörper 42 verbunden. Tappet body 42 connected.
Der Zylinderkopf 20 weist im Bereich der Zylinderbohrung 18 zum Nocken 16 hin einen die Zylinderbohrung 18 umgebenden zumindest annähernd zylinderförmigen 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. The cylinder head 20 has in the region of the cylinder bore 18 to the cam 16 toward a cylinder bore 18 surrounding at least approximately cylindrical portion 50. 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.
Wie in Figur 2 dargestellt 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 am 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, Polytetrafluorethylen, hergestellt. As shown in Figure 2, a sealing ring 52 is provided which surrounds the protruding from the cylinder bore 18 end portion of the pump piston 12 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 a surface with a low coefficient of friction, at least in the region of its contact with the pump piston 12, in order 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, polytetrafluoroethylene, for example.
Der Abschnitt 50 des Zylinderkopfs 20 weist an seinem Ende eine zur Zylinderbohrung 18 zumindest annähernd koaxiale Bohrung 58 auf, die einen größeren Durchmesser als die Zylinderbohrung 18 aufweist und die eine Aufnahme für den Dichtring 52 bildet. Am Übergang von der Bohrung 58 zur Zylinderbohrung 18 ist eine Ringschulter 60 gebildet. Der Dichtring 52 wird in der Aufnahme 58 in Rieh- tung der Längsachse 13 des Pumpenkolbens 12 durch ein Halteelement 64 gesichert. The portion 50 of the cylinder head 20 has at its end to the cylinder bore 18 at least approximately coaxial bore 58 which has a larger diameter than the cylinder bore 18 and which forms a receptacle for the sealing ring 52. At the transition from the bore 58 to the cylinder bore 18, an annular shoulder 60 is formed. The sealing ring 52 is in the receptacle 58 in Rieh- tion of the longitudinal axis 13 of the pump piston 12 is secured by a retaining element 64.
Das in Figur 3 dargestellte Halteelement 64 ist hülsenförmig ausgebildet, wobei dieses einen geschlossenen Ring 66 aufweist, von dem in Richtung der Längsachse 13 des Pumpenkolbens 12 wenigstens ein, vorzugsweise mehrere, beispielsweise wie in Figur 3 dargestellt drei über den Umfang des Rings 66 verteilt angeordnete Haltearme 68 abstehen. An dem dem Ring 66 abgewandten Ende jedes Haltearms 68 ist ein etwa radial zur Längsachse 13 zum Pumpenkolben 12 hin abstehender Haltesteg 70 angeordnet. Der dem Pumpenkolben 12 zugewandte Rand jedes Haltestegs 70 ist kreisabschnittförmig ausgebildet. Die Haltestege 70 sind durch elastische Verformung der Haltearme 68 in radialer Richtung bezüglich der Längsachse 13 beweglich. An den nahe dem Ring 66 liegenden Enden der Haltearme 68 ist an diesen jeweils eine radial nach außen hervorstehende Rastnase 72 angeordnet. Im Innenumfang der Aufnahme 58 ist für jede Rastnase 72 eine Ausnehmung vorgesehen, wobei die Ausnehmung vorzugsweise durch eine Ringnut 74 gebildet ist. Beim Einsetzen des Halteelements 64 in die Aufnahme 58 federn dessen Halte- arme 68 und die an diesen angeordneten Rastnasen 72 radial nach innen bis dieThe holding element 64 shown in Figure 3 is sleeve-shaped, which has a closed ring 66, of which in the direction of the longitudinal axis 13 of the pump piston 12 at least one, preferably a plurality, for example as shown in Figure 3 three distributed over the circumference of the ring 66 arranged Support arms 68 protrude. At the end facing away from the ring 66 of each support arm 68 a approximately radially to the longitudinal axis 13 to the pump piston 12 projecting retaining web 70 is arranged. The pump piston 12 facing edge of each retaining web 70 is formed in a circular section. The retaining webs 70 are movable in the radial direction with respect to the longitudinal axis 13 by elastic deformation of the retaining arms 68. At the near the ring 66 lying ends of the holding arms 68 is a radially outwardly projecting latching lug 72 is arranged on each of these. In the inner circumference of the receptacle 58, a recess is provided for each latching lug 72, wherein the recess is preferably formed by an annular groove 74. When the retaining element 64 is inserted into the receptacle 58, its holding arms 68 and the latching lugs 72 arranged on them spring radially inward until they stop
Rastnasen 72 in der Ringnut 74 einrasten. Die Haltearme 68 sind an deren nahe dem Ring 66 liegenden Endbereichen, in denen die Rastnasen 72 angeordnet sind, relativ steif, so dass nach dem Einrasten der Rastnasen 72 in die Ringnut 74 eine sichere Fixierung des Halteelements 64 erreicht ist. Snap locking lugs 72 in the annular groove 74. The retaining arms 68 are at their near the ring 66 lying end portions in which the locking lugs 72 are arranged, relatively stiff, so that after the engagement of the locking lugs 72 in the annular groove 74 a secure fixation of the retaining element 64 is reached.
Der Pumpenkolben 12 weist in seinem außerhalb der Aufnahme 58 angeordneten zweiten Endbereich eine Durchmesserverringerung auf, durch die eine von der Aufnahme 58 wegweisende Ringschulter 76 am Pumpenkolben 12 gebildet ist. Die Haltearme 68 des Halteelements 64 sind in ihrem nicht elastisch verform- ten Zustand so angeordnet, dass die Ränder von deren Haltestegen 70 auf einem Durchmesser dl angeordnet sind, der nur wenig größer ist als der kleinere Durchmesser d des zweiten Endbereichs des Pumpenkolbens 12 und der kleiner ist als der größere Durchmesser D des Pumpenkolbens 12. Bei der Montage der Pumpe wird der Dichtring 52 in die Aufnahme 58 eingesetzt, anschließend wird das Halteelement 64 in die Aufnahme 58 eingesetzt, bis dieses mit seinen Rast- nasen 72 in der Ringnut 74 eingerastet ist. Der Pumpenkolben 12 wird mit dem Stößelkörper 42 verbunden und der Pumpenkolben 12 wird mit seinem ersten Endbereich voraus durch das Halteelement 64 und den Dichtring 52 The pump piston 12 has in its outside of the receptacle 58 arranged second end portion on a diameter reduction, through which an annular away from the receptacle 58 annular shoulder 76 is formed on the pump piston 12. The holding arms 68 of the holding element 64 are arranged in their non-elastically deformed state such that the edges of their holding webs 70 are arranged on a diameter dl which is only slightly larger than the smaller diameter d of the second end region of the pump piston 12 and the is smaller than the larger diameter D of the pump piston 12. During assembly of the pump, the sealing ring 52 is inserted into the receptacle 58, then the retaining element 64 is inserted into the receptacle 58 until this with its detent nose 72 is engaged in the annular groove 74. The pump piston 12 is connected to the plunger body 42 and the pump piston 12 is preceded by its first end portion by the holding member 64 and the sealing ring 52nd
hindurchgesteckt und in die Zylinderbohrung 18 eingeführt. Die Haltearme 68 des Halteelements 64 schwenken beim Hindurchstecken des Pumpenkolbens 12 durch elastische Verformung auseinander und wenn der im Durchmesser verringerte Bereich des Pumpenkolbens 12 zwischen diesen angeordnet ist schwenken die Haltearme 68 wieder radial nach innen zum Pumpenkolben 12 hin. Der Pumpenkolben 12 und mit diesem der Stößelkörper 42 kann dann nicht mehr aus der Zylinderbohrung 18 herausgezogen werden, da dabei die Haltestege 70 der Haltearme 68 an der Ringschulter 76 des Pumpenkolbens 12 zur Anlage kommen. inserted through and inserted into the cylinder bore 18. The retaining arms 68 of the retaining element 64 pivot when elastically deformed when the pump piston 12 is pushed through, and when the reduced-diameter region of the pump piston 12 is arranged between them, the retaining arms 68 again pivot radially inwards toward the pump piston 12. The pump piston 12 and with this the plunger body 42 can then no longer be pulled out of the cylinder bore 18, since in this case the holding webs 70 of the support arms 68 come to rest on the annular shoulder 76 of the pump piston 12.
Das Halteelement 64 ist einstückig ausgebildet und kann aus Kunststoff hergestellt sein, beispielsweise in einem Spritzgießverfahren. Alternativ kann das Halteelement 64 auch aus Metall, insbesondere aus Blech durch Umformen hergestellt sein. The holding element 64 is formed in one piece and may be made of plastic, for example in an injection molding process. Alternatively, the holding member 64 may be made of metal, in particular of sheet metal by forming.
Beim Betrieb der Pumpe wird der Pumpenkolben 12 in einer Hubbewegung angetrieben. Die Ringschulter 76 des Pumpenkolbens 12 und die Haltestege 70 der Haltearme 68 des Halteelements 64 sind dabei in Richtung der Längsachse 13 des Pumpenkolbens 12 so zueinander beabstandet, dass der Pumpenkolben 12 den erforderlichen Hub zwischen seinem unteren Totpunkt und seinem oberen Totpunkt ausführen kann ohne dass die Haltestege 70 an der Ringschulter 76 zur Anlage kommen. During operation of the pump, the pump piston 12 is driven in a lifting movement. The annular shoulder 76 of the pump piston 12 and the retaining webs 70 of the support arms 68 of the support member 64 are spaced apart in the direction of the longitudinal axis 13 of the pump piston 12 so that the pump piston 12 can perform the required stroke between its bottom dead center and top dead center without the Holding webs 70 come to the annular shoulder 76 to the plant.
Alternativ zu der vorstehenden Ausführung kann auch vorgesehen sein, dass das Halteelement 64 nicht mittels einer Rastverbindung sondern über ein Gewinde oder eine Pressverbindung in der Aufnahme 58 des Gehäuseteils 20 fixiert ist. Weiterhin kann alternativ vorgesehen sein, dass das Halteelement 64 nicht in der Aufnahme 58 sondern am Außenmantel des Abschnitts 50 des Gehäuseteils 20 fixiert ist, beispielsweise mittels einer Rast-, Press- oder Gewindeverbindung. As an alternative to the above embodiment, it may also be provided that the holding element 64 is not fixed in the receptacle 58 of the housing part 20 by means of a latching connection but via a thread or a press connection. Furthermore, it may alternatively be provided that the holding element 64 is not fixed in the receptacle 58 but on the outer casing of the portion 50 of the housing part 20, for example by means of a latching, pressing or threaded connection.

Claims

Ansprüche claims
1. Pumpe, insbesondere Kraftstoffhochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine, mit einem Gehäuseteil (20), in dem in einer Zylinderbohrung (18) ein Pumpenkolben (12) hubbeweglich geführt ist, der mit seinem in der Zylinderbohrung (18) angeordneten ersten Endbereich einen Pumpenarbeitsraum (22) begrenzt und der mit seinem entgegengesetzten zweiten Endbereich aus der Zylinderbohrung (18) herausragt, wobei zwischen dem zweiten Endbereich des Pumpenkolbens (12) und dem 1. pump, in particular high-pressure fuel pump for a fuel injection device of an internal combustion engine, with a housing part (20) in which in a cylinder bore (18) a pump piston (12) is guided in a liftable, with its in the cylinder bore (18) arranged first end a pump working space (22) limited and protrudes with its opposite second end portion of the cylinder bore (18), wherein between the second end portion of the pump piston (12) and the
Gehäuseteil (20) ein Dichtelement (52) angeordnet ist, das in einer Aufnahme (58) des Gehäuseteils (20) mittels eines Halteelements (64) gesichert ist, wobei der Pumpenkolben (12) unter Ermöglichung der erforderlichen Hubbeweglichkeit zumindest mittelbar am Gehäuseteil (20) gesichert ist, dadurch gekennzeichnet, dass der Pumpenkolben (12) zumindest mittelbar durch das Halteelement (64) am Gehäuseteil (20) gesichert ist.  Housing part (20) a sealing element (52) is arranged, which in a receptacle (58) of the housing part (20) by means of a retaining element (64) is secured, wherein the pump piston (12) while allowing the necessary Hubbeweglichkeit at least indirectly on the housing part (20 ), characterized in that the pump piston (12) is at least indirectly secured by the retaining element (64) on the housing part (20).
2. Pumpe nach Anspruch 1, dadurch gekennzeichnet, dass das Halteelement (64) wenigstens einen am Pumpenkolben (12) zu dessen Sicherung angreifenden Haltearm (68) aufweist. 2. Pump according to claim 1, characterized in that the holding element (64) has at least one on the pump piston (12) acting to secure its support arm (68).
3. Pumpe nach Anspruch 2, dadurch gekennzeichnet, dass der wenigstens eine Haltearm (68) in radialer Richtung bezüglich der Längsachse (13) des Pumpenkolbens (12) elastisch verformbar ist. 3. Pump according to claim 2, characterized in that the at least one holding arm (68) in the radial direction with respect to the longitudinal axis (13) of the pump piston (12) is elastically deformable.
4. Pumpe nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der Pumpenkolben (12) in seinem zweiten Endbereich eine Durchmesserverringerung aufweist, durch die eine Ringschulter (76) am Pumpenkolben (12) gebildet ist, mit der der wenigstens eine Haltearm (68) des Halteelements (64) zusammenwirkt. 4. Pump according to claim 2 or 3, characterized in that the pump piston (12) in its second end region has a diameter reduction, by which an annular shoulder (76) on the pump piston (12) is formed, with which the at least one holding arm (68). the holding element (64) cooperates.
5. Pumpe nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass das Halteelement (64) einen in der Aufnahme (58) angeordneten Ring (66) aufweist, von dem der wenigstens eine, aus der Aufnahme (58) herausragende Haltearm (68) absteht. 5. Pump according to one of claims 2 to 4, characterized in that the holding element (64) has a in the receptacle (58) arranged ring (66), of which the at least one, from the receptacle (58) outstanding holding arm (68 ) protrudes.
6. Pumpe nach Anspruch 5, dadurch gekennzeichnet, dass das Halteelement (64) mittels einer Rastverbindung (72,74) in der Aufnahme (58) fixiert ist. 6. Pump according to claim 5, characterized in that the holding element (64) by means of a latching connection (72,74) in the receptacle (58) is fixed.
7. Pumpe nach Anspruch 6, dadurch gekennzeichnet, dass im Innenumfang der Aufnahme (58) eine Ausnehmung (74), vorzugsweise in Form einer Ringnut vorgesehen ist, in die wenigstens eine Rastnase (72) des Halteelements (64) eingerastet ist. 7. Pump according to claim 6, characterized in that in the inner circumference of the receptacle (58) has a recess (74), preferably in the form of an annular groove, into which at least one latching lug (72) of the holding element (64) is engaged.
8. Pumpe nach Anspruch 7, dadurch gekennzeichnet, dass die wenigstens eine Rastnase (72) am wenigstens einen Rastarm (68) nahe dem Ring (66) angeordnet ist. 8. A pump according to claim 7, characterized in that the at least one latching lug (72) on at least one latching arm (68) near the ring (66) is arranged.
9. Pumpe nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der zweite Endbereich des Pumpenkolbens (12) mit einem Stößelkörper (42), insbesondere eines Rollenstößels, verbunden ist. 9. Pump according to one of the preceding claims, characterized in that the second end region of the pump piston (12) with a plunger body (42), in particular a roller tappet, is connected.
10. Pumpe nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Halteelement (64) aus Kunststoff oder Blech hergestellt ist. 10. Pump according to one of the preceding claims, characterized in that the holding element (64) is made of plastic or sheet metal.
PCT/EP2016/050010 2015-03-11 2016-01-04 High-pressure fuel pump, in particular for a fuel injection device of an internal combustion engine WO2016142072A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015204321.5 2015-03-11
DE102015204321.5A DE102015204321A1 (en) 2015-03-11 2015-03-11 High-pressure fuel pump, in particular for a fuel injection device of an internal combustion engine

Publications (1)

Publication Number Publication Date
WO2016142072A1 true WO2016142072A1 (en) 2016-09-15

Family

ID=55069877

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/050010 WO2016142072A1 (en) 2015-03-11 2016-01-04 High-pressure fuel pump, in particular for a fuel injection device of an internal combustion engine

Country Status (2)

Country Link
DE (1) DE102015204321A1 (en)
WO (1) WO2016142072A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018203319A1 (en) * 2018-03-06 2019-09-12 Robert Bosch Gmbh High-pressure fuel pump

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1707799A1 (en) * 2005-03-30 2006-10-04 Denso Corporation Fuel pump having plunger and fuel supply system using the same
DE102009000859A1 (en) 2009-02-13 2010-08-19 Robert Bosch Gmbh Fuel high pressure pump for use as plug-in pump for conveying fuel for common rail fuel injection system of internal combustion engine, has safety ring inserted into annular ring and projecting over annular ring in relaxed condition
DE102010030498A1 (en) * 2010-06-24 2011-12-29 Robert Bosch Gmbh Pump, in particular high-pressure fuel pump
DE102013204347A1 (en) * 2013-03-13 2014-09-18 Robert Bosch Gmbh Pump, in particular fuel pump
DE102013207771A1 (en) * 2013-04-29 2014-10-30 Robert Bosch Gmbh Pump, in particular fuel pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1707799A1 (en) * 2005-03-30 2006-10-04 Denso Corporation Fuel pump having plunger and fuel supply system using the same
DE102009000859A1 (en) 2009-02-13 2010-08-19 Robert Bosch Gmbh Fuel high pressure pump for use as plug-in pump for conveying fuel for common rail fuel injection system of internal combustion engine, has safety ring inserted into annular ring and projecting over annular ring in relaxed condition
DE102010030498A1 (en) * 2010-06-24 2011-12-29 Robert Bosch Gmbh Pump, in particular high-pressure fuel pump
DE102013204347A1 (en) * 2013-03-13 2014-09-18 Robert Bosch Gmbh Pump, in particular fuel pump
DE102013207771A1 (en) * 2013-04-29 2014-10-30 Robert Bosch Gmbh Pump, in particular fuel pump

Also Published As

Publication number Publication date
DE102015204321A1 (en) 2016-09-15

Similar Documents

Publication Publication Date Title
EP1931875B1 (en) High pressure pump, in particular for a fuel injection device of an internal combustion engine
EP2867529B1 (en) Piston fuel pump
EP3108138B1 (en) Piston fuel pump for an internal combustion engine
DE10200792A1 (en) Fuel pump for an internal combustion engine
DE102009000859A1 (en) Fuel high pressure pump for use as plug-in pump for conveying fuel for common rail fuel injection system of internal combustion engine, has safety ring inserted into annular ring and projecting over annular ring in relaxed condition
DE102004013244A1 (en) High-pressure pump, in particular for a fuel injection device of an internal combustion engine
DE10212492B4 (en) piston pump
EP3108137B1 (en) Piston fuel pump for an internal combustion engine
EP3108135B1 (en) Piston fuel pump for an internal combustion engine
WO2005124153A1 (en) High-pressure pump for a fuel injection device of an internal combustion engine
WO2019015863A1 (en) Piston pump, particularly a high-pressure fuel pump for an internal combustion engine
DE102016220364A1 (en) Electromagnetically actuated inlet valve and high-pressure pump with inlet valve
WO2014048606A1 (en) Pump, in particular high-pressure fuel pump for a fuel injection device of an internal combustion engine
DE10150351A1 (en) Pump element and piston pump for high-pressure fuel generation
WO2019015859A1 (en) Piston pump
DE102008001890A1 (en) High-pressure pump i.e. radial or tandem piston pump, for fuel i.e. diesel, injection system of air compressed, self ignition internal combustion engine, has aligning element for aligning tappet body in orientation at area
WO2009021865A1 (en) Pump, particularly high-pressure fuel pump
WO2005031150A1 (en) Tappet assembly for a high-pressure pump and high-pressure pump comprising at least one tappet assembly
WO2013092865A1 (en) Pump, in particular high-pressure fuel pump for a fuel injection device
WO2016142072A1 (en) High-pressure fuel pump, in particular for a fuel injection device of an internal combustion engine
EP3061967B1 (en) Pump, in particular high-pressure fuel pump
EP3655649A1 (en) Piston pump, particularly a high-pressure fuel pump for an internal combustion engine
EP3387247B1 (en) Electromagnetically actuatable inlet valve and high-pressure pump having an inlet valve
EP2635797B1 (en) Pump, in particular high-pressure fuel pump
WO2016008626A1 (en) Pump, in particular high-pressure fuel pump for a fuel injection device of an internal combustion engine

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16700006

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16700006

Country of ref document: EP

Kind code of ref document: A1