EP3368764B1 - High-pressure pump - Google Patents

High-pressure pump Download PDF

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Publication number
EP3368764B1
EP3368764B1 EP16763546.5A EP16763546A EP3368764B1 EP 3368764 B1 EP3368764 B1 EP 3368764B1 EP 16763546 A EP16763546 A EP 16763546A EP 3368764 B1 EP3368764 B1 EP 3368764B1
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EP
European Patent Office
Prior art keywords
pressure pump
high pressure
covering cap
cylinder
projection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16763546.5A
Other languages
German (de)
French (fr)
Other versions
EP3368764A1 (en
Inventor
Dietmar Van Der Linden
Francesco Lucarelli
Karl-Heinz Laepple
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP3368764A1 publication Critical patent/EP3368764A1/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
    • F02M59/10—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
    • 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
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—Pumps feeding common rails

Definitions

  • the present invention relates to a high pressure pump according to the preamble of claim 1, a method for producing a high pressure pump according to the preamble of claim 11 and a high pressure injection system according to the preamble of claim 15.
  • Piston pumps are used as high-pressure pumps.
  • a drive shaft is mounted in a housing. Pistons are arranged radially in a cylinder.
  • On the drive shaft with at least one cam rests a roller with a roller rolling surface which is mounted in a roller shoe.
  • the roller shoe is connected to the piston so that the piston is forced to make an oscillating translational movement.
  • a spring applies a force directed radially to the drive shaft to the roller shoe, so that the roller is in constant contact with the drive shaft.
  • the roller stands with the roller rolling surface on a shaft rolling surface as a surface of the drive shaft with the at least one cam in contact with the drive shaft.
  • the roller is mounted in the roller shoe by means of a slide bearing.
  • the cylinder, in particular the cylinder head, of the high-pressure pump is covered by a cap made of a hard plastic, in particular a reinforced polyamide.
  • the task of the cover cap is to optically cover possible corrosion on the cylinder head so that the corrosion is no longer visible. Because of the hard material properties of the cover cap, the cover cap can essentially not adapt to different geometries of the high pressure pump when it is fastened and pushed onto the high pressure pump.
  • the cover cap is generally fastened before an electrical connector is fastened, since due to the very little or no deformation of the electrical connector and the rest of the high-pressure pump, it is not possible to fasten the cover cap after the electrical connector has been fastened to the high-pressure pump.
  • the assembly of the high pressure pump is unnecessarily difficult.
  • the DE 10 2006 045 933 A1 shows a high-pressure pump for delivering high-pressure fuel.
  • the high pressure pump has a drive shaft with cams. Cylindrical rollers are supported by roller shoes and rest on the cams. The roller shoes are mounted in a bore in part of the housing by means of a ram assembly.
  • the pump elements are attached to the tappet assembly. A coil spring presses the tappet assembly onto the cams.
  • a radial piston pump for generating high fuel pressure in fuel injection systems of internal combustion engines is known.
  • a drive shaft is mounted in a pump housing.
  • Pistons are supported on the drive shaft so that the pistons are moved back and forth when the drive shaft is turned.
  • Tappets are arranged between the piston and the drive shaft.
  • the disclosure document DE 103 45 725 A1 shows a fluid pump, in particular a high-pressure fuel pump, with a housing and with at least one inlet side low-pressure connection, an inlet valve, and a delivery space that is delimited by a delivery element.
  • the fluid pump has a housing cover, which has a cylindrical shape with a peripheral wall and a base. The free edge of the peripheral wall is welded to the housing body.
  • WO 2015/010856 discloses a high pressure pump with a pump head and a protective cap made of metal.
  • the disclosure document DE 10 2013 206 930 A1 discloses a piston pump, which comprises a pot-shaped housing which encloses further elements of the piston pump.
  • the cup-shaped housing is designed as a drawn, embossed and bent sheet metal part which, among other things, combines the functions of a "cover” and a mounting flange of conventional high-pressure fuel pumps.
  • High pressure pump in particular for a motor vehicle, for pumping a fluid, in particular fuel, e.g. B. Diesel, comprising a drive shaft with at least one cam, at least one piston, at least one cylinder for mounting the at least one piston, the at least one piston being supported on the drive shaft with the at least one cam, so that the at least one piston has a translational movement can be executed due to a rotational movement of the drive shaft, at least one cover cap which is indirectly attached to the outside of the cylinder, one end of the at least one cover cap resting on a projection of the rest of the high-pressure pump for positive and non-positive fastening of the end of the cover cap to the projection.
  • a fluid in particular fuel
  • fuel e.g. B. Diesel
  • One end, in particular an axial end, of the at least one covering cap rests on the projection, so that the covering cap is thereby particularly easily attached to the rest of the high-pressure pump in a form-fitting and force-fitting manner.
  • this enables simple assembly of the cover cap and on the other hand, the cap is thereby particularly reliably and permanently attached to the rest of the high-pressure pump.
  • the projection is formed on the outside of the high-pressure pump and / or the projection is formed as an undercut and / or the projection is formed in the radial direction with respect to a longitudinal axis of the cylinder and the end of the at least one cover cap on an axial stop of the projection rests.
  • the projection is formed in the circumferential direction or tangential direction with respect to a longitudinal axis of the cylinder and / or the projection is formed by a ring or a nut, in particular a union nut, on the cylinder.
  • the union nut or the ring forms the projection and also the axial stop at one axial end.
  • the at least one cover cap has an essentially central opening. The opening is used for
  • the at least one cover cap has an essentially radially formed support section and an essentially axially formed support section.
  • the radial support section is formed essentially in the radial direction with respect to the longitudinal axis of the cylinder and the axial support section is formed essentially in the axial direction with respect to the longitudinal axis of the cylinder.
  • the opening is preferably formed on the radial support section.
  • the end of the at least one cover cap, which rests on the projection of the rest of the high-pressure pump, is an edge of the opening.
  • an electrical connector is arranged in the opening.
  • a recess for a fuel nozzle is formed on the at least one cover cap, in particular on the axial support section, and / or the cylinder comprises a cylinder head and / or a bearing cylinder.
  • the cylinder head delimits a working space of the high pressure pump and the bearing cylinder serves to mount the at least one piston.
  • the at least one cover cap is at least partially, in particular completely, made of an elastic plastic, preferably thermoplastic elastomer, and / or the at least one cover cap is at least partially, in particular completely, made of one Material with a modulus of elasticity less than 5, 1 or 0.2 kN / mm 2 .
  • Method according to the invention for producing a high pressure pump in particular a high pressure pump described in this patent application, with the steps: providing a drive shaft with at least one cam, providing at least one piston, providing at least one cylinder for mounting the at least one piston Provide at least one cover cap, mounting the at least one drive shaft, the at least one piston, the at least one cylinder, so that the at least one piston is supported on the drive shaft with the at least one cam and a translational movement of the at least one piston due to a rotational movement of the drive shaft is feasible, fastening the at least one cover cap indirectly on the outside of the cylinder, the cover cap first being elastically stretched for fastening and then being elastically deformed so that due to the elastic recovery, one end of the at least one cover cap rests on the projection of the rest of the high-pressure pump and the at least one cover cap is thereby attached to the projection in a form-fitting and non-positive manner.
  • an electrical connector is first mounted and then the at least one cover cap is attached and / or the at least one cover cap is expanded and elastically deformed in the radial direction with respect to the longitudinal axis of the cylinder.
  • the at least one cover cap is expediently stretched essentially at an edge of an opening than the end of the at least one cover cap, so that the size of the opening is increased by the stretching and then the elastic recovery is carried out essentially at the edge of the opening and / or the already mounted electrical connector is first passed through the opening of the at least one cover cap and then the elastic stretching of the at least one cover cap is carried out and / or the cover cap, in particular an axial support section, is stretched, in particular stretched in the radial direction, and then the cover cap, in particular the axial support section is fastened to the rest of the high-pressure pump with elastic bias.
  • the at least one piston is supported indirectly with a roller or another supporting device on the drive shaft with the at least one cam.
  • the at least one roller is expediently mounted in at least one roller shoe by means of at least one slide bearing or slide bearing.
  • the at least one roller in a section perpendicular to a longitudinal axis as the axis of rotation, surrounds the slide bearing by more than 50% of the at least one roller.
  • an eccentric shaft is viewed as a drive shaft with at least one cam.
  • a radial direction and / or axial direction relates to a longitudinal axis of the cylinder on which the cover cap rests directly or indirectly.
  • High-pressure injection system for an internal combustion engine, in particular for a motor vehicle, comprising a high-pressure pump, a high-pressure rail, preferably a prefeed pump for pumping fuel from a fuel tank to the high-pressure pump, the high-pressure pump being designed as a high-pressure pump described in this patent application.
  • the pressure that can be generated by the high pressure pump in the high pressure rail is, for example, in the range from 1000 to 3000 bar z. B. for diesel engines or between 40 bar and 400 bar z. B. for gasoline engines.
  • An internal combustion engine according to the invention with a high pressure injection system comprises a high pressure injection system described in this patent application and / or a high pressure pump described in this patent application.
  • the high-pressure pump 1 has a drive shaft 2 with two cams 3, which rotates about an axis of rotation 26.
  • the axis of rotation 26 lies in the plane of the drawing Fig. 1 and is perpendicular to the plane of the drawing Fig. 2 .
  • a piston 5 is mounted in a piston guide 7 of the mounting cylinder 15.
  • the cylinder 6 thus also forms a housing.
  • a working space 29 is delimited by the cylinder 6, in particular the cylinder head 14, and the piston 5.
  • An inlet channel 22 with an inlet valve 19 and an outlet channel 24 with an outlet valve 20 open into the working chamber 29.
  • the fuel flows into the working chamber 29 through the inlet channel 22 and the fuel flows out of the working chamber 29 again under high pressure through the outlet channel 24.
  • a check valve is designed in such a way that only fuel can flow into the working chamber 29 and the outlet valve 20, for.
  • B. a check valve is designed in such a way that only fuel can flow out of the working chamber 29.
  • the volume of the working space 29 is changed due to an oscillating stroke movement of the piston 5.
  • the piston 5 is supported indirectly on the drive shaft 2.
  • a roller shoe 9 with a roller 10 is attached to the end of the piston 5 or pump piston 5.
  • the roller 10 can perform a rotational movement, the axis of rotation 25 of which is in the plane of the drawing according to FIG Fig. 1 lies and perpendicular to the plane of the drawing Fig. 2 stands.
  • the drive shaft 2 with the at least one cam 3 has a shaft rolling surface 4 and the roller 10 has a roller rolling surface 11.
  • FIG. 6 An axial direction 40 is aligned parallel to the longitudinal axis 17 and a radial direction 41 is perpendicular to the longitudinal axis 17 of the cylinder 6
  • a radial direction 41 is perpendicular to the longitudinal axis 17 of the cylinder 6
  • FIG. 6 the cylinder 6 is shown in a very simplified manner without a distinction between the cylinder head 14 and the bearing cylinder 15.
  • one end region of the cylinder 6 has an external thread 47 and a union nut 45 with an internal thread 46 is screwed onto the external thread 47.
  • the union nut 45 also forms a ring 44.
  • the in Fig. 6 The illustrated lower end area of the union nut 45 has a greater radial distance from the longitudinal axis 17 than the cylinder 6 in this area, so that a in Fig.
  • the illustrated lower axial end of the union nut 45 forms an axial stop 43 for the cover cap 8.
  • the axial stop 43 or the lower end region of the union nut 45 as shown in FIG Fig. 6 thus forms a projection 16 with respect to the cylinder 6 and also an undercut 42 running completely around the circumference.
  • the cover cap 8 has an edge 49 at the opening 48.
  • the electrical connector 52 is already finally fastened to the cylinder 6.
  • the electrical connector 52 is first inserted into the opening 48 of the cap 8 ( Fig. 7 ) and then the cover cap 8 is placed on an upper end of the union nut 45 in the area of the opening 48 or in the area of the edge 49.
  • the edge 49 of the cover cap 8 is thus elastically pretensioned.
  • the covering cap 8 is continued by the tool 56 as shown in FIG Fig. 6 , 9 and 10 Moved in a downward direction towards the fuel nozzle 54 until the edge 49 of the cap 8 has passed over the union nut 45, so that an elastic recovery of the cap 8 occurs at the edge 49 and the diameter of the opening 48 of the cap 8 increases is reduced again due to the elastic recovery in the radial direction 41.
  • the cover cap 8 is already attached to the high-pressure pump 1, so that the edge 49 rests on the axial stop 43 of the union nut 45 due to the elastic return deformation of the edge 49 of the cover cap 8.
  • the cover cap 8 is reliably attached to the rest of the high-pressure pump 1 in a form-fitting manner.
  • the geometry of the axial support section 51 is designed in such a way that the axial support section 51, after being fastened in the position in FIG Fig. 6 and 10 rests on the cylinder 6 with an elastic bias.
  • the cover cap 8 is additionally attached to the rest of the high-pressure pump 1 in a force-locking manner.
  • FIG. 11 a further, second embodiment of the attached cover cap 8 is shown.
  • the cover cap 8 also covers the union nut 45.
  • the high-pressure injection system 36 for a motor vehicle 38 is shown in a highly schematic representation with a high-pressure rail 30 or a fuel rail 31.
  • the fuel is injected from the high-pressure rail 30 into the combustion chamber of the internal combustion engine 39 by means of valves (not shown).
  • a prefeed pump 35 conveys fuel from a fuel tank 32 through a fuel line 33 to the high pressure pump 1 according to the above exemplary embodiment.
  • the prefeed pump 35 can also be driven by an electric motor (not shown) without a mechanical coupling (not shown) to the drive shaft 2.
  • the high pressure pump 1 and the prefeed pump 35 are driven by the drive shaft 2.
  • the drive shaft 2 is coupled to a crankshaft of the internal combustion engine 39.
  • the high pressure rail 30 serves to inject the fuel into the combustion chamber of the internal combustion engine 39.
  • the fuel delivered by the prefeed pump 35 is conducted to the high-pressure pump 1 through the fuel line 33.
  • the fuel not required by the high-pressure pump 1 is returned to the fuel tank 32 through a fuel return line 34.
  • a metering unit 37 controls and / or regulates the amount of fuel fed to the high-pressure pump 1, so that in a further embodiment the fuel return line 34 can be dispensed with (not shown).
  • the high-pressure pump 1 according to the invention and the high-pressure injection system 36 according to the invention are associated with considerable advantages.
  • the cover cap 8 is formed from an elastic plastic.
  • the cover cap 8 can advantageously adapt to different geometries, in particular also during assembly. This enables the cover cap 8 to be installed after the electrical connector 52 has been attached to the high-pressure pump 1, since when the electrical connector 52 is passed through the opening 48 of the cover cap 8, due to the geometry of the high-pressure pump 1 including the electrical connector 52, an elastic deformation of the cover cap 8 occurs necessary is.
  • cover cap 8 Due to these elastic properties of the cover cap 8, it can also enable a sealing function with respect to the cylinder 6, in particular with an additional optional pretensioning of the cover cap 8 after fastening, so that the cover cap 8 at least on partial surfaces between the cover cap 8 and the rest of the high-pressure pump 1 under an elastic Preload rests on the rest of the high pressure pump 1 and this enables a sealing function. In this way, penetration of moisture and water into the area between the cover cap 8 and the rest of the high-pressure pump 1 can be avoided in an advantageous manner.

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

Description

Die vorliegende Erfindung betrifft eine Hochdruckpumpe gemäß dem Oberbegriff des Anspruches 1, ein Verfahren zur Herstellung einer Hochdruckpumpe gemäß dem Oberbegriff des Anspruches 11 und ein Hochdruckeinspritzsystem gemäß dem Oberbegriff des Anspruches 15.The present invention relates to a high pressure pump according to the preamble of claim 1, a method for producing a high pressure pump according to the preamble of claim 11 and a high pressure injection system according to the preamble of claim 15.

Stand der TechnikState of the art

In Hochdruckeinspritzsystemen für Verbrennungsmotoren, insbesondere in Common-Rail-Einspritzsystemen von Diesel- oder Benzinmotoren, sorgt eine Hochdruckpumpe dauernd für die Aufrechterhaltung des Druckes in dem Hochdruckspeicher des Common-Rail-Einspritzsystems. Die Hochdruckpumpe kann beispielsweise durch eine Nockenwelle des Verbrennungsmotors mittels einer Antriebswelle angetrieben werden. Für die Förderung des Kraftstoffs zur Hochdruckpumpe werden Vorförderpumpen, z. B. eine Zahnrad- oder Drehschieberpumpe, verwendet, die der Hochdruckpumpe vorgeschaltet sind. Die Vorförderpumpe fördert den Kraftstoff von einem Kraftstofftank durch eine Kraftstoffleitung zu der Hochdruckpumpe.In high-pressure injection systems for internal combustion engines, in particular in common-rail injection systems of diesel or gasoline engines, a high-pressure pump continuously maintains the pressure in the high-pressure accumulator of the common-rail injection system. The high pressure pump can be driven, for example, by a camshaft of the internal combustion engine by means of a drive shaft. For the delivery of the fuel to the high pressure pump, pre-feed pumps, z. B. a gear or rotary vane pump is used, which are connected upstream of the high pressure pump. The prefeed pump conveys the fuel from a fuel tank through a fuel line to the high-pressure pump.

Als Hochdruckpumpen werden unter anderem Kolbenpumpen eingesetzt. In einem Gehäuse ist eine Antriebswelle gelagert. Radial dazu sind Kolben in einem Zylinder angeordnet. Auf der Antriebswelle mit wenigstens einem Nocken liegt eine Laufrolle mit einer Rollen-Rollfläche auf, die in einem Rollenschuh gelagert ist. Der Rollenschuh ist mit dem Kolben verbunden, sodass der Kolben zu einer oszillierenden Translationsbewegung gezwungen ist. Eine Feder bringt auf den Rollenschuh eine radial zu der Antriebswelle gerichtet Kraft auf, sodass die Laufrolle in ständigen Kontakt zu der Antriebswelle steht. Die Laufrolle steht mit der Rollen-Rollfläche an einer Wellen-Rollfläche als Oberfläche der Antriebswelle mit dem wenigstens einen Nocken in Kontakt mit der Antriebswelle. Die Laufrolle ist mittels eines Gleitlagers in dem Rollenschuh gelagert.Piston pumps, among other things, are used as high-pressure pumps. A drive shaft is mounted in a housing. Pistons are arranged radially in a cylinder. On the drive shaft with at least one cam rests a roller with a roller rolling surface which is mounted in a roller shoe. The roller shoe is connected to the piston so that the piston is forced to make an oscillating translational movement. A spring applies a force directed radially to the drive shaft to the roller shoe, so that the roller is in constant contact with the drive shaft. The roller stands with the roller rolling surface on a shaft rolling surface as a surface of the drive shaft with the at least one cam in contact with the drive shaft. The roller is mounted in the roller shoe by means of a slide bearing.

Der Zylinder, insbesondere der Zylinderkopf, der Hochdruckpumpe ist von einer Abdeckkappe aus einem harten Kunststoff, insbesondere einem verstärkten Polyamid, abgedeckt. Die Aufgabe der Abdeckkappe besteht darin, eine mögliche Korrosion an dem Zylinderkopf optisch abzudecken, sodass die Korrosion nicht mehr sichtbar ist. Aufgrund der harten Werkstoffeigenschaften der Abdeckkappe kann sich die Abdeckkappe im Wesentlichen nicht an unterschiedliche Geometrien der Hochdruckpumpe beim Befestigen und Aufschieben auf die Hochdruckpumpe anpassen. Bei der Montage wird im Allgemeinen die Abdeckkappe vor der Befestigung eines elektrischen Steckers befestigt, da aufgrund der nur sehr geringen oder nicht möglichen Verformung des elektrischen Steckers und der übrigen Hochdruckpumpe eine Befestigung der Abdeckkappe nach der Befestigung des elektrischen Steckers an der Hochdruckpumpe nicht möglich ist. Die Montage der Hochdruckpumpe ist dadurch unnötig erschwert.The cylinder, in particular the cylinder head, of the high-pressure pump is covered by a cap made of a hard plastic, in particular a reinforced polyamide. The task of the cover cap is to optically cover possible corrosion on the cylinder head so that the corrosion is no longer visible. Because of the hard material properties of the cover cap, the cover cap can essentially not adapt to different geometries of the high pressure pump when it is fastened and pushed onto the high pressure pump. During assembly, the cover cap is generally fastened before an electrical connector is fastened, since due to the very little or no deformation of the electrical connector and the rest of the high-pressure pump, it is not possible to fasten the cover cap after the electrical connector has been fastened to the high-pressure pump. The assembly of the high pressure pump is unnecessarily difficult.

Die DE 10 2006 045 933 A1 zeigt eine Hochdruckpumpe zur Kraftstoffhochdruckförderung. Die Hochdruckpumpe weist eine Antriebswelle mit Nocken auf. Zylindrische Rollen sind von Rollenschuhen gelagert und liegen auf den Nocken auf. Die Rollenschuhe sind mittels einer Stößelbaugruppe in einer Bohrung eines Teils des Gehäuses gelagert. Die Pumpenelemente sind an der Stößelbaugruppe befestigt. Eine Schraubenfeder drückt die Stößelbaugruppe auf die Nocken.The DE 10 2006 045 933 A1 shows a high-pressure pump for delivering high-pressure fuel. The high pressure pump has a drive shaft with cams. Cylindrical rollers are supported by roller shoes and rest on the cams. The roller shoes are mounted in a bore in part of the housing by means of a ram assembly. The pump elements are attached to the tappet assembly. A coil spring presses the tappet assembly onto the cams.

Aus der DE 103 56 262 A1 ist eine Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen bekannt. In einem Pumpengehäuse ist eine Antriebswelle gelagert. Kolben stützen sich an der Antriebswelle ab, sodass durch Drehen der Antriebswelle die Kolben hin und her bewegt werden. Zwischen den Kolben und der Antriebswelle sind Stößel angeordnet.From the DE 103 56 262 A1 a radial piston pump for generating high fuel pressure in fuel injection systems of internal combustion engines is known. A drive shaft is mounted in a pump housing. Pistons are supported on the drive shaft so that the pistons are moved back and forth when the drive shaft is turned. Tappets are arranged between the piston and the drive shaft.

Die Offenlegungsschrift DE 103 45 725 A1 zeigt eine Fluidpumpe, insbesondere Kraftstoff-Hochdruckpumpe, mit einem Gehäuse und mit mindestens einem einlassseitiaen Niederdruckanschluss, einem Einlassventil, und einem Förderraum, der von einem Förderelement begrenzt wird. Die Fluidpumpe weist einen Gehäusedeckel auf, wobei dieser eine zylindrische Gestalt hat mit einer Umfangswand und einer Basis. Der freie Rand der Umfangswand ist mit dem Gehäusekörper verschweißt.The disclosure document DE 103 45 725 A1 shows a fluid pump, in particular a high-pressure fuel pump, with a housing and with at least one inlet side low-pressure connection, an inlet valve, and a delivery space that is delimited by a delivery element. The fluid pump has a housing cover, which has a cylindrical shape with a peripheral wall and a base. The free edge of the peripheral wall is welded to the housing body.

Das Dokument WO 2015/010856 offenbart eine Hochdruckpumpe mit einem Pumpenkopf und einer Schutzkappe aus Metall.The document WO 2015/010856 discloses a high pressure pump with a pump head and a protective cap made of metal.

Die Offenlegungsschrift DE 10 2013 206 930 A1 offenbart eine Kolbenpumpe, wobei diese ein topfförmig ausgeführtes Gehäuse umfasst, welches weitere Elemente der Kolbenpumpe umschließt. Das topfförmige Gehäuse ist als gezogenes, geprägtes und gebogenes Blechteil ausgeführt, welches unter anderem die Funktionen eines "Deckels" und eines Befestigungsflansches herkömmlicher Hochdruck-Kraftstoffpumpen in sich vereint.The disclosure document DE 10 2013 206 930 A1 discloses a piston pump, which comprises a pot-shaped housing which encloses further elements of the piston pump. The cup-shaped housing is designed as a drawn, embossed and bent sheet metal part which, among other things, combines the functions of a "cover" and a mounting flange of conventional high-pressure fuel pumps.

Offenbarung der ErfindungDisclosure of the invention Vorteile der ErfindungAdvantages of the invention

Erfindungsgemäße Hochdruckpumpe, insbesondere für ein Kraftfahrzeug, zum Fördern eines Fluides, insbesondere Kraftstoff, z. B. Diesel, umfassend eine Antriebswelle mit wenigstens einem Nocken, wenigstens einen Kolben, wenigstens einen Zylinder zur Lagerung des wenigstens einen Kolbens, wobei sich der wenigstens eine Kolben auf der Antriebswelle mit dem wenigstens einen Nocken abstützt, sodass von dem wenigstens einen Kolben eine Translationsbewegung aufgrund einer Rotationsbewegung der Antriebswelle ausführbar ist, wenigstens eine Abdeckkappe, welche mittelbar außenseitig an dem Zylinder befestigt ist, wobei ein Ende der wenigstens einen Abdeckkappe an einem Vorsprung der übrigen Hochdruckpumpe aufliegt zur form- und kraftschlüssigen Befestigung des Endes der Abdeckkappe an dem Vorsprung. Ein Ende, insbesondere ein axiales Ende, der wenigstens einen Abdeckkappe liegt an dem Vorsprung auf, sodass dadurch die Abdeckkappe besonders einfach form- und kraftschlüssig an der übrigen Hochdruckpumpe befestigt ist. Dies ermöglicht einerseits eine einfache Montage der Abdeckkappe und andererseits ist dadurch die Abdeckkappe besonders zuverlässig und dauerhaft an der übrigen Hochdruckpumpe befestigt.High pressure pump according to the invention, in particular for a motor vehicle, for pumping a fluid, in particular fuel, e.g. B. Diesel, comprising a drive shaft with at least one cam, at least one piston, at least one cylinder for mounting the at least one piston, the at least one piston being supported on the drive shaft with the at least one cam, so that the at least one piston has a translational movement can be executed due to a rotational movement of the drive shaft, at least one cover cap which is indirectly attached to the outside of the cylinder, one end of the at least one cover cap resting on a projection of the rest of the high-pressure pump for positive and non-positive fastening of the end of the cover cap to the projection. One end, in particular an axial end, of the at least one covering cap rests on the projection, so that the covering cap is thereby particularly easily attached to the rest of the high-pressure pump in a form-fitting and force-fitting manner. On the one hand, this enables simple assembly of the cover cap and on the other hand, the cap is thereby particularly reliably and permanently attached to the rest of the high-pressure pump.

Erfindungsgemäß liegt die wenigstens eine Abdeckkappe mit einer elastischen Vorspannkraft auf der übrigen Hochdruckpumpe auf. Aufgrund der elastischen Vorspannkraft ist die Abdeckkappe zusätzlich kraftschlüssig an der übrigen Hochdruckpumpe befestigt. Aufgrund der elastischen Eigenschaften der Abdeckkappe kann während der Montage eine elastische Dehnung der Abdeckkappe ausgeführt werden, welche nach der Befestigung wenigstens teilweise weiterhin vorhanden ist, sodass aufgrund dieser elastischen Vorspannung der Abdeckkappe die Abdeckkappe mit einer elastischen Vorspannkraft außenseitig auf der übrigen Hochdruckpumpe aufliegt. Neben der formschlüssigen Befestigung der Abdeckkappe an der übrigen Hochdruckpumpe ist damit die Abdeckkappe zusätzlich auch kraftschlüssig an der übrigen Hochdruckpumpe befestigbar.According to the invention, the at least one cover cap rests on the rest of the high-pressure pump with an elastic pretensioning force. Due to the elastic pre-tensioning force, the cover cap is additionally attached to the rest of the high-pressure pump with a force fit. Due to the elastic properties of the cover cap, an elastic expansion of the cover cap can be carried out during assembly, which is at least partially still present after attachment, so that due to this elastic pretensioning of the cover cap, the cover cap rests on the outside of the rest of the high-pressure pump with an elastic pretensioning force. In addition to the positive fastening of the cover cap on the rest of the high pressure pump, the cover cap can therefore also be fastened to the rest of the high pressure pump in a force fit.

In einer zusätzlichen Ausführungsform ist der Vorsprung außenseitig an der Hochdruckpumpe ausgebildet und/oder der Vorsprung als ein Hinterschnitt ausgebildet ist und/oder der Vorsprung in radialer Richtung bezüglich einer Längsachse des Zylinders ausgebildet ist und das Ende der wenigstens einen Abdeckkappe an einem axialen Anschlag des Vorsprunges aufliegt.In an additional embodiment, the projection is formed on the outside of the high-pressure pump and / or the projection is formed as an undercut and / or the projection is formed in the radial direction with respect to a longitudinal axis of the cylinder and the end of the at least one cover cap on an axial stop of the projection rests.

In einer ergänzenden Variante ist der Vorsprung in Umfangsrichtung bzw. tangentialer Richtung bezüglich einer Längsachse des Zylinders ausgebildet und/oder der Vorsprung ist von einem Ring oder einer Mutter, insbesondere Überwurfmutter, auf dem Zylinder gebildet. Die Überwurfmutter oder der Ring bildet an einem axialen Ende den Vorsprung und auch den axialen Anschlag. Dadurch ist eine besonders sichere und zuverlässige Befestigung möglich, da der Vorsprung und/oder der axiale Anschlag vollständig umlaufend in tangentialer Richtung bezüglich der Längsachse ausgebildet ist. Dadurch kann auch ein vollständig umlaufendes Ende als ein Rand einer Öffnung an der Abdeckkappe formschlüssig auf den axialen Anschlag vollständig umlaufend aufgelegt und befestigt werden.In a supplementary variant, the projection is formed in the circumferential direction or tangential direction with respect to a longitudinal axis of the cylinder and / or the projection is formed by a ring or a nut, in particular a union nut, on the cylinder. The union nut or the ring forms the projection and also the axial stop at one axial end. A particularly secure and reliable fastening is thereby possible, since the projection and / or the axial stop is formed completely circumferentially in the tangential direction with respect to the longitudinal axis. As a result, a completely circumferential end as an edge of an opening on the cover cap can also be placed and fastened in a form-fitting manner on the axial stop completely circumferentially.

In einer zusätzlichen Ausführungsform weist die wenigstens eine Abdeckkappe eine im Wesentlichen zentrische Öffnung auf. Die Öffnung dient zurIn an additional embodiment, the at least one cover cap has an essentially central opening. The opening is used for

Durchführung eines elektrischen Steckers. In dem elektrischen Stecker sind Steuerleitungen angeordnet zur Steuerung und/oder Regelung einer Zumesseinheit der Hochdruckpumpe. Die Zumesseinheit ist vorzugsweise in die Hochdruckpumpe, insbesondere einen Zylinder und/oder ein Gehäuse der Hochdruckpumpe, integriert.Implementation of an electrical connector. Control lines for controlling and / or regulating a metering unit of the high-pressure pump are arranged in the electrical connector. The metering unit is preferably integrated into the high pressure pump, in particular a cylinder and / or a housing of the high pressure pump.

In einer zusätzlichen Ausführungsform weist die wenigstens eine Abdeckkappe einen im Wesentlichen radial ausgebildeten Auflageabschnitt und einen im Wesentlichen axial ausgebildeten Auflageabschnitt auf. Der radiale Auflageabschnitt ist im Wesentlichen in radialer Richtung bezüglich der Längsachse des Zylinders ausgebildet und der axiale Auflageabschnitt ist im Wesentlichen in axialer Richtung bezüglich der Längsachse des Zylinders ausgebildet.In an additional embodiment, the at least one cover cap has an essentially radially formed support section and an essentially axially formed support section. The radial support section is formed essentially in the radial direction with respect to the longitudinal axis of the cylinder and the axial support section is formed essentially in the axial direction with respect to the longitudinal axis of the cylinder.

Vorzugsweise ist die Öffnung an dem radialen Auflageabschnitt ausgebildet.The opening is preferably formed on the radial support section.

In einer zusätzlichen Ausgestaltung ist das Ende der wenigstens einen Abdeckkappe, welches an dem Vorsprung der übrigen Hochdruckpumpe aufliegt, ein Rand der Öffnung.In an additional embodiment, the end of the at least one cover cap, which rests on the projection of the rest of the high-pressure pump, is an edge of the opening.

In einer ergänzenden Variante ist in der Öffnung ein elektrischer Stecker angeordnet.In a supplementary variant, an electrical connector is arranged in the opening.

In einer zusätzlichen Ausführungsform ist an der wenigstens einen Abdeckkappe, insbesondere an dem axialen Auflageabschnitt, eine Aussparung für einen Kraftstoffstutzen ausgebildet und/oder der Zylinder umfasst einen Zylinderkopf und/oder einen Lagerungszylinder. Der Zylinderkopf begrenzt einen Arbeitsraum der Hochdruckpumpe und der Lagerungszylinder dient zur Lagerung des wenigstens einen Kolbens.In an additional embodiment, a recess for a fuel nozzle is formed on the at least one cover cap, in particular on the axial support section, and / or the cylinder comprises a cylinder head and / or a bearing cylinder. The cylinder head delimits a working space of the high pressure pump and the bearing cylinder serves to mount the at least one piston.

In einer ergänzenden Ausgestaltung ist die wenigstens eine Abdeckkappe ist-wenigstens teilweise, insbesondere vollständig, aus einem elastischen Kunststoff, vorzugsweise thermoplastischen Elastomer, ausgebildet und/oder die wenigstens eine Abdeckkappe ist wenigstens teilweise, insbesondere vollständig, aus einem Werkstoff mit einem Elastizitätsmodul kleiner als 5, 1 oder 0,2 kN/mm2 ausgebildet.In a supplementary embodiment , the at least one cover cap is at least partially, in particular completely, made of an elastic plastic, preferably thermoplastic elastomer, and / or the at least one cover cap is at least partially, in particular completely, made of one Material with a modulus of elasticity less than 5, 1 or 0.2 kN / mm 2 .

Erfindungsgemäßes Verfahren zur Herstellung einer Hochdruckpumpe, insbesondere einer in dieser Schutzrechtsanmeldung beschriebenen Hochdruckpumpe, mit den Schritten: zur Verfügung stellen einer Antriebswelle mit wenigstens einem Nocken, zur Verfügung stellen wenigstens eines Kolbens, zur Verfügung stellen wenigstens eines Zylinders zur Lagerung des wenigstens einen Kolbens, zur Verfügung stellen wenigstens einer Abdeckkappe, Montieren der wenigstens einen Antriebswelle, des wenigstens einen Kolbens, des wenigstens einen Zylinders, sodass sich der wenigstens eine Kolben auf der Antriebswelle mit dem wenigstens einen Nocken abstützt und von dem wenigstens einen Kolben eine Translationsbewegung aufgrund einer Rotationsbewegung der Antriebswelle ausführbar ist, Befestigen der wenigstens einen Abdeckkappe mittelbar außenseitig auf dem Zylinder, wobei die Abdeckkappe zur Befestigung zuerst elastisch gedehnt wird und anschließend eine elastische Rückverformung ausgeführt wird, sodass aufgrund der elastischen Rückverformung ein Ende der wenigstens einen Abdeckkappe an dem Vorsprung der übrigen Hochdruckpumpe aufliegt und die wenigstens eine Abdeckkappe dadurch form- und kraftschlüssig an dem Vorsprung befestigt wird.Method according to the invention for producing a high pressure pump, in particular a high pressure pump described in this patent application, with the steps: providing a drive shaft with at least one cam, providing at least one piston, providing at least one cylinder for mounting the at least one piston Provide at least one cover cap, mounting the at least one drive shaft, the at least one piston, the at least one cylinder, so that the at least one piston is supported on the drive shaft with the at least one cam and a translational movement of the at least one piston due to a rotational movement of the drive shaft is feasible, fastening the at least one cover cap indirectly on the outside of the cylinder, the cover cap first being elastically stretched for fastening and then being elastically deformed so that due to the elastic recovery, one end of the at least one cover cap rests on the projection of the rest of the high-pressure pump and the at least one cover cap is thereby attached to the projection in a form-fitting and non-positive manner.

In einer ergänzenden Ausgestaltung wird zuerst ein elektrischer Stecker montiert und wird anschließend die wenigstens eine Abdeckkappe befestigt und/oder die wenigstens eine Abdeckkappe wird in radialer Richtung bezüglich der Längsachse des Zylinders gedehnt und elastisch rückverformt.In a supplementary embodiment, an electrical connector is first mounted and then the at least one cover cap is attached and / or the at least one cover cap is expanded and elastically deformed in the radial direction with respect to the longitudinal axis of the cylinder.

Zweckmäßig wird die wenigstens eine Abdeckkappe im Wesentlichen an einem Rand einer Öffnung als das Ende der wenigstens einen Abdeckkappe gedehnt, sodass die Größe der Öffnung durch das Dehnen vergrößert wird und anschließend die elastische Rückverformung im Wesentlichen an dem Rand der Öffnung ausgeführt wird und/oder der bereits montierte elektrische Stecker zuerst durch die Öffnung der wenigstens einen Abdeckkappe geführt wird und anschließend das elastische Dehnen der wenigstens einen Abdeckkappe ausgeführt wird und/oder die Abdeckkappe, insbesondere ein axialer Auflageabschnitt, gedehnt, insbesondere in radialer Richtung gedehnt, wird und anschließend die Abdeckkappe, insbesondere der axiale Auflageabschnitt, mit einer elastischen Vorspannung auf der übrigen Hochdruckpumpe befestigt wird.The at least one cover cap is expediently stretched essentially at an edge of an opening than the end of the at least one cover cap, so that the size of the opening is increased by the stretching and then the elastic recovery is carried out essentially at the edge of the opening and / or the already mounted electrical connector is first passed through the opening of the at least one cover cap and then the elastic stretching of the at least one cover cap is carried out and / or the cover cap, in particular an axial support section, is stretched, in particular stretched in the radial direction, and then the cover cap, in particular the axial support section is fastened to the rest of the high-pressure pump with elastic bias.

In einer zusätzlichen Variante wird die wenigstens eine Abdeckkappe gedehnt, indem die Abdeckkappe in axialer Richtung auf die Hochdruckpumpe außenseitig aufgeschoben wird und aufgrund der außenseitigen Geometrie der Hochdruckpumpe bewirkt die axiale Bewegung der wenigstens einen Abdeckkappe die, insbesondere radiale, Dehnung der wenigstens einen Abdeckkappe.In an additional variant, the at least one cover cap is stretched in that the cover cap is pushed onto the outside of the high-pressure pump in the axial direction and, due to the geometry of the high-pressure pump on the outside, the axial movement of the at least one cover cap causes the, in particular radial, expansion of the at least one cover cap.

In einer ergänzenden Ausgestaltung stützt sich der wenigstens eine Kolben mit eine Laufrolle oder einer anderen Abstützvorrichtung mittelbar auf der Antriebswelle mit dem wenigstens einen Nocken ab.In a supplementary embodiment, the at least one piston is supported indirectly with a roller or another supporting device on the drive shaft with the at least one cam.

Zweckmäßig ist die wenigstens eine Laufrolle mittels wenigstens einen Gleitlagers bzw. einer Gleitlagerung in wenigstens einem Rollenschuh gelagert.The at least one roller is expediently mounted in at least one roller shoe by means of at least one slide bearing or slide bearing.

In einer weiteren Ausführungsform umgreift in einem Schnitt senkrecht zu einer Längsachse als Rotationsachse die wenigstens eine Laufrolle das Gleitlager zu mehr als 50 % die wenigstens einen Laufrolle.In a further embodiment, in a section perpendicular to a longitudinal axis as the axis of rotation, the at least one roller surrounds the slide bearing by more than 50% of the at least one roller.

Insbesondere ist das Gleitlager mittels Kraftstoff, z. B. Benzin oder Diesel, geschmiert.In particular, the plain bearing by means of fuel, for. B. gasoline or diesel, lubricated.

In einer weiteren Ausgestaltung ist eine Kontaktfläche zwischen der Rollen-Rollfläche und der Wellen-Rollfläche mittels Kraftstoff geschmiert.In a further embodiment, a contact surface between the roller rolling surface and the shaft rolling surface is lubricated by means of fuel.

In einer weiteren Variante wird eine Exzenterwelle als eine Antriebswelle mit wenigstens einem Nocken betrachtet.In a further variant, an eccentric shaft is viewed as a drive shaft with at least one cam.

In einer ergänzenden Ausgestaltung bezieht sich eine radial Richtung und/oder axiale Richtung auf eine Längsachse des Zylinders an welchem die Abdeckkappe mittelbar oder unmittelbar aufliegt.In a supplementary embodiment, a radial direction and / or axial direction relates to a longitudinal axis of the cylinder on which the cover cap rests directly or indirectly.

Erfindungsgemäßes Hochdruckeinspritzsystem für einen Verbrennungsmotor, insbesondere für ein Kraftfahrzeug, umfassend eine Hochdruckpumpe, ein Hochdruck-Rail, vorzugsweise eine Vorförderpumpe zum Fördern eines Kraftstoffes von einem Kraftstofftank zu der Hochdruckpumpe, wobei die Hochdruckpumpe als eine in dieser Schutzrechtsanmeldung beschriebene Hochdruckpumpe ausgebildet ist.High-pressure injection system according to the invention for an internal combustion engine, in particular for a motor vehicle, comprising a high-pressure pump, a high-pressure rail, preferably a prefeed pump for pumping fuel from a fuel tank to the high-pressure pump, the high-pressure pump being designed as a high-pressure pump described in this patent application.

In einer weiteren Variante weist das Hochdruckeinspritzsystem eine Zumesseinheit auf, welche die von der Vorförderpumpe zu der Hochdruckpumpe geförderte Menge an Kraftstoff pro Zeiteinheit steuert oder regelt.In a further variant, the high-pressure injection system has a metering unit which controls or regulates the amount of fuel delivered per unit of time from the prefeed pump to the high-pressure pump.

Der von der Hochdruckpumpe erzeugbare Druck in dem Hochdruck-Rail liegt beispielsweise im Bereich von 1000 bis 3000 bar z. B. für Dieselmotoren oder zwischen 40 bar und 400 bar z. B. für Benzinmotoren.The pressure that can be generated by the high pressure pump in the high pressure rail is, for example, in the range from 1000 to 3000 bar z. B. for diesel engines or between 40 bar and 400 bar z. B. for gasoline engines.

Ein erfindungsgemäßer Verbrennungsmotor mit einem Hochdruckeinspritzsystem, insbesondere für ein Kraftfahrzeug, umfasst ein in dieser Schutzrechtsanmeldung beschriebenes Hochdruckeinspritzsystem und/oder eine in dieser Schutzrechtsanmeldung beschriebene Hochdruckpumpe.An internal combustion engine according to the invention with a high pressure injection system, in particular for a motor vehicle, comprises a high pressure injection system described in this patent application and / or a high pressure pump described in this patent application.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Im Nachfolgenden werden Ausführungsbeispiele der Erfindung unter Bezugnahme auf die beigefügten Zeichnungen näher beschrieben. Es zeigt:

Fig. 1
einen Querschnitt einer Hochdruckpumpe,
Fig. 2
einen Schnitt A-A gemäß Fig. 1 einer Laufrolle mit Rollenschuh und einer Antriebswelle,
Fig. 3
eine stark schematisierte Ansicht eines Hochdruckeinspritzsystems und
Fig. 4
eine Ansicht eines Kraftfahrzeuges,
Fig. 5
eine perspektivische Ansicht einer Abdeckkappe in einem ersten Ausführungsbeispiel für einen Zylinder der Hochdruckpumpe,
Fig. 6
einen Längsschnitt durch die Abdeckkappe gemäß Fig. 5, einen Teil des Zylinders und eine Überwurfmutter nach der Befestigung der Abdeckkappe an dem Zylinder,
Fig. 7
eine erste perspektivische Ansicht eines Teils der Hochdruckpumpe während des Befestigens der Abdeckkappe gemäß Fig. 5 an dem Zylinder,
Fig. 8
eine zweite perspektivische Ansicht eines Teils der Hochdruckpumpe während des Befestigens der Abdeckkappe gemäß Fig. 5 an dem Zylinder,
Fig. 9
eine erste Seitenansicht eines Teils der Hochdruckpumpe kurz vor dem Befestigen der Abdeckkappe gemäß Fig. 5 an dem Zylinder und einen Längsschnitt der Abdeckkappe,
Fig. 10
eine zweite Seitenansicht des Teils der Hochdruckpumpe nach dem Befestigen der Abdeckkappe gemäß Fig. 5 an dem Zylinder und den Längsschnitt der Abdeckkappe und
Fig. 11
eine zweite Seitenansicht des Teils der Hochdruckpumpe nach dem Befestigen der Abdeckkappe in einem zweiten Ausführungsbeispiel an dem Zylinder und den Längsschnitt der Abdeckkappe.
In the following, exemplary embodiments of the invention are described in more detail with reference to the accompanying drawings. It shows:
Fig. 1
a cross section of a high pressure pump,
Fig. 2
a section AA according to Fig. 1 a roller with roller shoe and a drive shaft,
Fig. 3
a highly schematic view of a high pressure injection system and
Fig. 4
a view of a motor vehicle,
Fig. 5
a perspective view of a cover cap in a first embodiment for a cylinder of the high pressure pump,
Fig. 6
a longitudinal section through the cap according to Fig. 5 , part of the cylinder and a union nut after attaching the cap to the cylinder,
Fig. 7
a first perspective view of a part of the high pressure pump during the attachment of the cap according to FIG Fig. 5 on the cylinder,
Fig. 8
a second perspective view of part of the high pressure pump during the fastening of the cap according to FIG Fig. 5 on the cylinder,
Fig. 9
a first side view of a part of the high pressure pump shortly before the attachment of the cap according to FIG Fig. 5 on the cylinder and a longitudinal section of the cap,
Fig. 10
a second side view of the part of the high pressure pump after attaching the cap according to FIG Fig. 5 on the cylinder and the longitudinal section of the cap and
Fig. 11
a second side view of the part of the high pressure pump after the attachment of the cap in a second embodiment to the cylinder and the longitudinal section of the cap.

Ausführungsformen der ErfindungEmbodiments of the invention

In Fig. 1 ist ein stark vereinfachter Querschnitt einer Hochdruckpumpe 1 für ein Hochdruckeinspritzsystem 36 dargestellt. Fig. 1 dient nur zur Veranschaulichung der Funktionsweise und zeigt insbesondere nicht die genaue geometrisches Ausbildung eines Zylinders 6. Der Zylinder 6 umfasst einen Zylinderkopf 14 und einen Lagerungszylinder 15. Die Hochdruckpumpe 1 dient dazu, Kraftstoff, z. B. Benzin oder Diesel, zu einem Verbrennungsmotor 39 unter Hochdruck zu fördern. Der von der Hochdruckpumpe 1 erzeugbare Druck liegt beispielsweise in einem Bereich zwischen 1000 und 3000 bar.In Fig. 1 a greatly simplified cross section of a high pressure pump 1 for a high pressure injection system 36 is shown. Fig. 1 serves only to illustrate the mode of operation and in particular does not show the exact geometric configuration of a cylinder 6. The cylinder 6 comprises a cylinder head 14 and a bearing cylinder 15. The high-pressure pump 1 is used to deliver fuel, e.g. B. gasoline or diesel to promote an internal combustion engine 39 under high pressure. The pressure that can be generated by the high-pressure pump 1 is, for example, in a range between 1000 and 3000 bar.

Die Hochdruckpumpe 1 weist eine Antriebswelle 2 mit zwei Nocken 3 auf, die um eine Rotationsachse 26 eine Rotationsbewegung ausführt. Die Rotationsachse 26 liegt in der Zeichenebene von Fig. 1 und steht senkrecht auf der Zeichenebene von Fig. 2. Ein Kolben 5 ist in einer Kolbenführung 7 des Lagerungszylinders 15 gelagert. Der Zylinder 6 bildet damit auch ein Gehäuse. Ein Arbeitsraum 29 wird von dem Zylinder 6, insbesondere Zylinderkopf 14, und dem Kolben 5 begrenzt. In den Arbeitsraum 29 mündet ein Einlasskanal 22 mit einem Einlassventil 19 und ein Auslasskanal 24 mit einem Auslassventil 20. Durch den Einlasskanal 22 strömt der Kraftstoff in den Arbeitsraum 29 ein und durch den Auslasskanal 24 strömt der Kraftstoff unter Hochdruck aus den Arbeitsraum 29 wieder aus. Das Einlassventil 19, z. B. ein Rückschlagventil, ist dahingehend ausgebildet, dass nur Kraftstoff in den Arbeitsraum 29 einströmen kann und das Auslassventil 20, z. B. ein Rückschlagventil, ist dahingehend ausgebildet, dass nur Kraftstoff aus dem Arbeitsraum 29 ausströmen kann. Das Volumen des Arbeitsraumes 29 wird aufgrund einer oszillierenden Hubbewegung des Kolbens 5 verändert. Der Kolben 5 stützt sich mittelbar auf der Antriebswelle 2 ab. Am Ende des Kolbens 5 bzw. Pumpenkolbens 5 ist ein Rollenschuh 9 mit einer Laufrolle 10 befestigt. Die Laufrolle 10 kann dabei eine Rotationsbewegung ausführen, deren Rotationsachse 25 in der Zeichenebene gemäß Fig. 1 liegt und senkrecht auf der Zeichenebene von Fig. 2 steht. Die Antriebswelle 2 mit dem wenigstens einen Nocken 3 weist eine Wellen-Rollfläche 4 und die Laufrolle 10 eine Rollen-Rollfläche 11 auf.The high-pressure pump 1 has a drive shaft 2 with two cams 3, which rotates about an axis of rotation 26. The axis of rotation 26 lies in the plane of the drawing Fig. 1 and is perpendicular to the plane of the drawing Fig. 2 . A piston 5 is mounted in a piston guide 7 of the mounting cylinder 15. The cylinder 6 thus also forms a housing. A working space 29 is delimited by the cylinder 6, in particular the cylinder head 14, and the piston 5. An inlet channel 22 with an inlet valve 19 and an outlet channel 24 with an outlet valve 20 open into the working chamber 29. The fuel flows into the working chamber 29 through the inlet channel 22 and the fuel flows out of the working chamber 29 again under high pressure through the outlet channel 24. The inlet valve 19, e.g. B. a check valve is designed in such a way that only fuel can flow into the working chamber 29 and the outlet valve 20, for. B. a check valve is designed in such a way that only fuel can flow out of the working chamber 29. The volume of the working space 29 is changed due to an oscillating stroke movement of the piston 5. The piston 5 is supported indirectly on the drive shaft 2. A roller shoe 9 with a roller 10 is attached to the end of the piston 5 or pump piston 5. The roller 10 can perform a rotational movement, the axis of rotation 25 of which is in the plane of the drawing according to FIG Fig. 1 lies and perpendicular to the plane of the drawing Fig. 2 stands. The drive shaft 2 with the at least one cam 3 has a shaft rolling surface 4 and the roller 10 has a roller rolling surface 11.

Die Rollen-Lauffläche 11 der Laufrolle 10 rollt sich auf der Wellen-Rollfläche 4 der Antriebswelle 2 mit den beiden Nocken 3 ab. Der Rollenschuh 9 ist in einer von dem Zylinder 6 gebildeten Rollenschuhlagerung als Gleitlager gelagert. Eine Feder 27 bzw. Spiralfeder 27 als elastisches Element 28, die zwischen dem Zylinder 6 und dem Rollenschuh 9 eingespannt ist, bringt auf den Rollenschuh 9 eine Druckkraft auf, sodass die Rollen-Rollfläche 11 der Laufrolle 10 in ständigen Kontakt mit der Wellen-Rollfläche 4 der Antriebswelle 2 steht. Der Rollenschuh 9 und der Kolben 5 führen damit gemeinsam eine oszillierende Hubbewegung aus. An einer Kontaktfläche 12 zwischen der Wellen-Rollfläche 4 der Antriebswelle 2 und der Rollen-Rollfläche 11 der Laufrolle 10 tritt im Wesentlichen kein Schlupf auf.The roller running surface 11 of the roller 10 rolls on the shaft rolling surface 4 of the drive shaft 2 with the two cams 3. The roller shoe 9 is mounted as a slide bearing in a roller shoe bearing formed by the cylinder 6. A spring 27 or coil spring 27 as an elastic element 28 between the The cylinder 6 and the roller shoe 9 is clamped, applies a compressive force to the roller shoe 9 so that the roller rolling surface 11 of the roller 10 is in constant contact with the shaft rolling surface 4 of the drive shaft 2. The roller shoe 9 and the piston 5 thus jointly perform an oscillating stroke movement. Essentially no slip occurs on a contact surface 12 between the shaft rolling surface 4 of the drive shaft 2 and the roller rolling surface 11 of the roller 10.

Eine elastische Abdeckkappe 8 aus einem elastischen Kunststoff dient dazu, Korrosion an dem Zylinder 6, insbesondere dem Zylinderkopf 14, abzudecken, sodass möglicherweise auftretende Korrosion von außen nicht sichtbar ist. Die Abdeckkappe 8 weist einen radialen Auflageabschnitt 50 und einen axialen Auflageabschnitt 51 auf. Der axiale Auflageabschnitt 51 ist im Wesentlichen zylinderförmig bzw. zylindermantelförmig ausgebildet und weist außerdem eine Aussparung 55 für einen Kraftstoffstutzen 54 der Hochdruckpumpe 1 auf. In dem Kraftstoffstutzen 54 sind der Einlasskanal 22 und/oder der Auslasskanal 24 integriert oder eingebaut. An dem scheibenförmigen radialen Auflageabschnitt 50 ist eine Öffnung 48 zur Aufnahme eines elektrischen Steckers 52 ausgebildet. Der Zylinder 6 weist eine Längsachse 17 auf und die Längsachse 17 entspricht auch einer Bewegungsrichtung der Translationsbewegung des Kolbens 5. Eine axiale Richtung 40 ist parallel zu der Längsachse 17 ausgerichtet und eine radiale Richtung 41 steht senkrecht auf der Längsachse 17 des Zylinders 6. In Fig. 6 ist der Zylinder 6 sehr stark vereinfacht dargestellt ohne eine Unterscheidung in Zylinderkopf 14 und Lagerungszylinder 15. In dem Zylinder 6 ist eine Bohrung 53 zur Aufnahme des elektrischen Steckers 52 eingearbeitet. Außerdem weist ein Endbereich des Zylinders 6 ein Außengewinde 47 auf und auf das Außengewinde 47 ist eine Überwurfmutter 45 mit einem Innengewinde 46 aufgeschraubt. Die Überwurfmutter 45 bildet auch einen Ring 44. Der in Fig. 6 dargestellte untere Endbereich der Überwurfmutter 45 weist zu der Längsachse 17 einen größeren radialen Abstand auf als der Zylinder 6 in diesem Bereich, sodass dadurch ein in Fig. 6 dargestelltes unteres axiales Ende der Überwurfmutter 45 einen axialen Anschlag 43 für die Abdeckkappe 8 bildet. Der axiale Anschlag 43 bzw. der untere Endbereich der Überwurfmutter 45 gemäß der Darstellung in Fig. 6 bildet damit einen Vorsprung 16 bezüglich des Zylinders 6 und auch einen vollständig in Umfangsrichtung umlaufenden Hinterschnitt 42. Die Abdeckkappe 8 weist an der Öffnung 48 einen Rand 49 auf. Vor der Montage bzw. Befestigung der Abdeckkappe 8 an der Hochdruckpumpe 1 ist bereits der elektrische Stecker 52 an dem Zylinder 6 abschließend befestigt. Zur Montage der Abdeckkappe 8 wird zunächst der elektrische Stecker 52 in die Öffnung 48 der Abdeckkappe 8 eingeführt (Fig. 7) und anschließend die Abdeckkappe 8 im Bereich der Öffnung 48 bzw. im Bereich des Randes 49 auf ein oberes Ende der Überwurfmutter 45 aufgelegt. Der Durchmesser der Öffnung 48 ist dabei geringfügig kleiner als der Außendurchmesser der Überwurfmutter 45 an dem oberen Endbereich der Überwurfmutter 45 gemäß der Darstellung in Fig. 6. In Fig. 8 ist die Abdeckkappe 8 im Bereich der Öffnung 48 an diesem oberen Endbereich der Überwurfmutter 45 aufgelegt. Anschließend wird mit einem Werkzeug 56 eine Kraft in axialer Richtung auf die Abdeckkappe 8 an dem Rand 49 aufgebracht, sodass aufgrund der Geometrie des Überwurfmutter 45 an dem oberen Endbereich der Rand 49 im Bereich der Öffnung 48 radial nach außen gedehnt wird, sodass dadurch der Durchmesser der Öffnung 48 der Abdeckkappe 8 vergrößert wird und im Wesentlichen dem Durchmesser der Überwurfmutter 45 entspricht. Aufgrund dieser elastischen radialen Dehnung der Abdeckkappe 8 an dem Rand 49 ist somit der Rand 49 der Abdeckkappe 8 elastisch vorgespannt. Von dem Werkzeug 56 wird die Abdeckkappe 8 weiter gemäß der Darstellung in Fig. 6, 9 und 10 in einer Richtung nach unten bewegt in Richtung zu dem Kraftstoffstutzen 54, bis der Rand 49 der Abdeckkappe 8 die Überwurfmutter 45 überstrichen hat, sodass dadurch eine elastische Rückverformung der Abdeckkappe 8 an dem Rand 49 auftritt und dadurch sich der Durchmesser der Öffnung 48 der Abdeckkappe 8 aufgrund der elastischen Rückverformung in radialer Richtung 41 wieder verringert. In Fig. 6 und 10 ist die Abdeckkappe 8 bereits an der Hochdruckpumpe 1 befestigt, sodass aufgrund der elastischen Rückverformung des Randes 49 der Abdeckkappe 8 der Rand 49 auf dem axialen Anschlag 43 der Überwurfmutter 45 aufliegt. Dadurch ist die Abdeckkappe 8 zuverlässig formschlüssig an der übrigen Hochdruckpumpe 1 befestigt. Die Geometrie des axialen Auflageabschnitts 51 ist dahingehend ausgebildet, dass auch der axiale Auflageabschnitt 51 zusätzlich nach der Befestigung in der Position in Fig. 6 und 10 mit einer elastischen Vorspannung auf dem Zylinder 6 aufliegt. Dadurch ist die Abdeckkappe 8 zusätzlich kraftschlüssig an der übrigen Hochdruckpumpe 1 befestigt.An elastic cover cap 8 made of an elastic plastic serves to cover corrosion on the cylinder 6, in particular the cylinder head 14, so that any corrosion that may occur is not visible from the outside. The cover cap 8 has a radial support section 50 and an axial support section 51. The axial support section 51 is essentially cylindrical or cylinder jacket-shaped and also has a recess 55 for a fuel connector 54 of the high-pressure pump 1. The inlet channel 22 and / or the outlet channel 24 are integrated or built into the fuel connector 54. An opening 48 for receiving an electrical plug 52 is formed on the disk-shaped radial support section 50. The cylinder 6 has a longitudinal axis 17 and the longitudinal axis 17 also corresponds to a direction of movement of the translational movement of the piston 5. An axial direction 40 is aligned parallel to the longitudinal axis 17 and a radial direction 41 is perpendicular to the longitudinal axis 17 of the cylinder 6 Fig. 6 the cylinder 6 is shown in a very simplified manner without a distinction between the cylinder head 14 and the bearing cylinder 15. In addition, one end region of the cylinder 6 has an external thread 47 and a union nut 45 with an internal thread 46 is screwed onto the external thread 47. The union nut 45 also forms a ring 44. The in Fig. 6 The illustrated lower end area of the union nut 45 has a greater radial distance from the longitudinal axis 17 than the cylinder 6 in this area, so that a in Fig. 6 The illustrated lower axial end of the union nut 45 forms an axial stop 43 for the cover cap 8. The axial stop 43 or the lower end region of the union nut 45 as shown in FIG Fig. 6 thus forms a projection 16 with respect to the cylinder 6 and also an undercut 42 running completely around the circumference. The cover cap 8 has an edge 49 at the opening 48. Before the cover cap 8 is mounted or fastened to the high-pressure pump 1, the electrical connector 52 is already finally fastened to the cylinder 6. To assemble the cap 8, the electrical connector 52 is first inserted into the opening 48 of the cap 8 ( Fig. 7 ) and then the cover cap 8 is placed on an upper end of the union nut 45 in the area of the opening 48 or in the area of the edge 49. The diameter of the opening 48 is slightly smaller than the outer diameter of the union nut 45 at the upper end region of the union nut 45 as shown in FIG Fig. 6 . In Fig. 8 the cap 8 is placed in the region of the opening 48 on this upper end region of the union nut 45. Then, a tool 56 is used to apply a force in the axial direction to the cap 8 at the edge 49, so that, due to the geometry of the union nut 45 at the upper end region, the edge 49 in the region of the opening 48 is expanded radially outward, so that the diameter the opening 48 of the cap 8 is enlarged and corresponds essentially to the diameter of the union nut 45. Because of this elastic radial expansion of the cover cap 8 at the edge 49, the edge 49 of the cover cap 8 is thus elastically pretensioned. The covering cap 8 is continued by the tool 56 as shown in FIG Fig. 6 , 9 and 10 Moved in a downward direction towards the fuel nozzle 54 until the edge 49 of the cap 8 has passed over the union nut 45, so that an elastic recovery of the cap 8 occurs at the edge 49 and the diameter of the opening 48 of the cap 8 increases is reduced again due to the elastic recovery in the radial direction 41. In Fig. 6 and 10 the cover cap 8 is already attached to the high-pressure pump 1, so that the edge 49 rests on the axial stop 43 of the union nut 45 due to the elastic return deformation of the edge 49 of the cover cap 8. As a result, the cover cap 8 is reliably attached to the rest of the high-pressure pump 1 in a form-fitting manner. The geometry of the axial support section 51 is designed in such a way that the axial support section 51, after being fastened in the position in FIG Fig. 6 and 10 rests on the cylinder 6 with an elastic bias. As a result, the cover cap 8 is additionally attached to the rest of the high-pressure pump 1 in a force-locking manner.

In Fig. 11 ist ein weiteres, zweites Ausführungsbeispiel der befestigten Abdeckkappe 8 dargestellt. Die Abdeckkappe 8 überdeckt auch die Überwurfmutter 45.In Fig. 11 a further, second embodiment of the attached cover cap 8 is shown. The cover cap 8 also covers the union nut 45.

In Fig. 3 ist in stark schematisierter Darstellung das Hochdruckeinspritzsystem 36 für ein Kraftfahrzeug 38 abgebildet mit einem Hochdruck-Rail 30 oder einem Kraftstoffverteilerrohr 31. Von dem Hochdruck-Rail 30 wird der Kraftstoff mittels Ventilen (nicht dargestellt) in den Verbrennungsraum des Verbrennungsmotors 39 eingespritzt. Eine Vorförderpumpe 35 fördert Kraftstoff von einem Kraftstofftank 32 durch eine Kraftstoffleitung 33 zu der Hochdruckpumpe 1 gemäß dem obigen Ausführungsbeispiel. Die Vorförderpumpe 35 kann auch mit einem Elektromotor (nicht dargestellt) angetrieben werden ohne einer mechanischen Koppelung (nicht dargestellt) mit der Antriebswelle 2. Die Hochdruckpumpe 1 und die Vorförderpumpe 35 werden dabei von der Antriebswelle 2 angetrieben. Die Antriebswelle 2 ist mit einer Kurbelwelle des Verbrennungsmotors 39 gekoppelt. Das Hochdruck-Rail 30 dient - wie bereits beschrieben - dazu, den Kraftstoff in den Verbrennungsraum des Verbrennungsmotors 39 einzuspritzen. Der von der Vorförderpumpe 35 geförderte Kraftstoff wird durch die Kraftstoffleitung 33 zu der Hochdruckpumpe 1 geleitet. Der von der Hochdruckpumpe 1 nicht benötigte Kraftstoff wird dabei durch eine Kraftstoffrücklaufleitung 34 wieder in den Kraftstofftank 32 zurückgeleitet. Eine Zumesseinheit 37 steuert und/oder regelt die der Hochdruckpumpe 1 zugeleitete Menge an Kraftstoff, sodass in einer weiteren Ausgestaltung auf die Kraftstoffrücklaufleitung 34 verzichtet werden kann (nicht dargestellt).In Fig. 3 The high-pressure injection system 36 for a motor vehicle 38 is shown in a highly schematic representation with a high-pressure rail 30 or a fuel rail 31. The fuel is injected from the high-pressure rail 30 into the combustion chamber of the internal combustion engine 39 by means of valves (not shown). A prefeed pump 35 conveys fuel from a fuel tank 32 through a fuel line 33 to the high pressure pump 1 according to the above exemplary embodiment. The prefeed pump 35 can also be driven by an electric motor (not shown) without a mechanical coupling (not shown) to the drive shaft 2. The high pressure pump 1 and the prefeed pump 35 are driven by the drive shaft 2. The drive shaft 2 is coupled to a crankshaft of the internal combustion engine 39. As already described, the high pressure rail 30 serves to inject the fuel into the combustion chamber of the internal combustion engine 39. The fuel delivered by the prefeed pump 35 is conducted to the high-pressure pump 1 through the fuel line 33. The fuel not required by the high-pressure pump 1 is returned to the fuel tank 32 through a fuel return line 34. A metering unit 37 controls and / or regulates the amount of fuel fed to the high-pressure pump 1, so that in a further embodiment the fuel return line 34 can be dispensed with (not shown).

Insgesamt betrachtet sind mit der erfindungsgemäßen Hochdruckpumpe 1 und dem erfindungsgemäßen Hochdruckeinspritzsystem 36 erhebliche Vorteile verbunden. Die Abdeckkappe 8 ist aus einem elastischen Kunststoff ausgebildet. Dadurch kann sich in vorteilhafter Weise die Abdeckkappe 8 an unterschiedlichen Geometrien, insbesondere auch während der Montage, anpassen. Dies ermöglicht die Montage der Abdeckkappe 8 nach der Befestigung des elektrischen Steckers 52 an der Hochdruckpumpe 1, da beim Durchführen des elektrischen Steckers 52 durch die Öffnung 48 der Abdeckkappe 8 aufgrund der Geometrie der Hochdruckpumpe 1 einschließlich des elektrischen Steckers 52 eine elastische Verformung der Abdeckkappe 8 notwendig ist. Aufgrund dieser elastischen Eigenschaften der Abdeckkappe 8 kann diese auch eine Dichtfunktion ermöglichen bezüglich des Zylinders 6, insbesondere bei einer zusätzlichen optionalen Vorspannung der Abdeckkappe 8 nach dem Befestigen, sodass die Abdeckkappe 8 wenigstens an Teilflächen zwischen der Abdeckkappe 8 und der übrigen Hochdruckpumpe 1 unter einer elastischen Vorspannung auf der übrigen Hochdruckpumpe 1 aufliegt und dies dadurch eine Dichtfunktion ermöglicht. Dadurch kann ein Eindringen von Feuchtigkeit und Wasser in den Bereich zwischen der Abdeckkappe 8 und der übrigen Hochdruckpumpe 1 in vorteilhafter Weise vermieden werden.Viewed overall, the high-pressure pump 1 according to the invention and the high-pressure injection system 36 according to the invention are associated with considerable advantages. The cover cap 8 is formed from an elastic plastic. As a result, the cover cap 8 can advantageously adapt to different geometries, in particular also during assembly. This enables the cover cap 8 to be installed after the electrical connector 52 has been attached to the high-pressure pump 1, since when the electrical connector 52 is passed through the opening 48 of the cover cap 8, due to the geometry of the high-pressure pump 1 including the electrical connector 52, an elastic deformation of the cover cap 8 occurs necessary is. Due to these elastic properties of the cover cap 8, it can also enable a sealing function with respect to the cylinder 6, in particular with an additional optional pretensioning of the cover cap 8 after fastening, so that the cover cap 8 at least on partial surfaces between the cover cap 8 and the rest of the high-pressure pump 1 under an elastic Preload rests on the rest of the high pressure pump 1 and this enables a sealing function. In this way, penetration of moisture and water into the area between the cover cap 8 and the rest of the high-pressure pump 1 can be avoided in an advantageous manner.

Claims (15)

  1. High pressure pump (1), in particular for a motor vehicle (38), for delivering a fluid, in particular fuel, for example diesel, comprising
    a drive shaft (2) with at least one cam (3),
    at least one piston (5),
    at least one cylinder (6) for mounting the at least one piston (5),
    the at least one piston (5) being supported on the drive shaft (2) with the at least one cam (3), with the result that a translational movement can be carried out by the at least one piston (5) on the basis of a rotational movement of the drive shaft (2),
    at least one covering cap (8) which is fastened indirectly to the cylinder (6) on the outer side,
    characterized in that
    an end (18) of the at least one covering cap (8) lies on a projection (16) of the remaining high pressure pump (1) in order to fasten the end (18) of the covering cap (8) to the projection (16) in a positively locking manner,
    the at least one covering cap (8) lying on the remaining high pressure pump (1) with an elastic prestressing force.
  2. High pressure pump according to Claim 1,
    characterized in that
    the projection (16) is configured on the high pressure pump (1) on the outer side
    and/or
    the projection (16) is configured as an undercut (42) and/or
    the projection (16) is configured in the radial direction (41) with regard to a longitudinal axis (17) of the cylinder (6), and the end (18) of the at least one covering cap (8) lies on an axial stop (43) of the projection (16).
  3. High pressure pump according to Claim 1 or 2,
    characterized in that
    the projection (16) is configured in the circumferential direction or tangential direction with regard to a longitudinal axis (17) of the cylinder (6)
    and/or
    the projection (16) is formed by a ring (44) or a nut (45), in particular a union nut (45), on the cylinder (6).
  4. High pressure pump according to one or more of the preceding claims,
    characterized in that
    the at least one covering cap (8) has a substantially central opening (48).
  5. High pressure pump according to one or more of the preceding claims,
    characterized in that
    the at least one covering cap (8) has a substantially radially configured supporting section (50) and a substantially axially configured supporting section (51).
  6. High pressure pump according to Claim 5,
    characterized in that
    the opening (48) is configured on the radial supporting section (50).
  7. High pressure pump according to one or more of Claims 4 to 6,
    characterized in that
    the end (18) of the at least one covering cap (8) which lies on the projection (16) of the remaining high pressure pump (1) is an edge (49) of the opening (48).
  8. High pressure pump according to one or more of Claims 4 to 7,
    characterized in that
    an electric plug (52) is arranged in the opening (48).
  9. High pressure pump according to one or more of the preceding claims,
    characterized in that
    a cutout (55) for a fuel nozzle (54) is configured on the at least one covering cap (8), in particular on the axial supporting section (51),
    and/or
    the cylinder (8) comprises a cylinder head (14) and/or a mounting cylinder (15).
  10. High pressure pump according to one or more of the preceding claims,
    characterized in that
    the at least one covering cap (8) is configured at least partially, in particular completely, from an elastic plastic, preferably thermoplastic elastomer,
    and/or
    the at least one covering cap (8) is configured at least partially, in particular completely, from a material with a modulus of elasticity of less than 5, 1 or 0.2 kN/mm2.
  11. Method for producing a high pressure pump (1), in particular a high pressure pump (1) according to one or more of the preceding claims, having the steps:
    provision of a drive shaft (2) with at least one cam (3),
    provision of at least one piston (5),
    provision of at least one cylinder (6) for mounting the at least one piston (5),
    provision of at least one covering cap (8),
    assembling of the at least one drive shaft (2), the at least one piston (5) and the at least one cylinder (6), with the result that the at least one piston (5) is supported on the drive shaft (2) with the at least one cam (3), and a translational movement can be carried out by the at least one piston (5) on the basis of a rotational movement of the drive shaft (2),
    fastening of the at least one covering cap (8) indirectly on the cylinder (6) on the outer side,
    characterized in that
    the covering cap (8) is first of all stretched elastically for fastening purposes, and an elastic recovery is subsequently carried out, with the result that an end (18) of the at least one covering cap (8) lies on the projection (16) of the remaining high pressure pump (1) on account of the elastic recovery, and the at least one covering cap (8) is fastened to the projection (16) in a positively locking manner as a result.
  12. Method according to Claim 11,
    characterized in that
    first of all an electric plug (52) is mounted, and subsequently the at least one covering cap (8) is fastened, and/or
    the at least one covering cap (8) is stretched in the radial direction (41) with regard to the longitudinal axis (17) of the cylinder (6) and is recovered elastically.
  13. Method according to Claim 11 or 12,
    characterized in that
    the at least one covering cap (8) is stretched substantially at an edge (49) of an opening (48) as the end (18) of the at least one covering cap (8), with the result that the size of the opening (48) is increased by way of the stretching, and the elastic recovery is subsequently carried out substantially at the edge (49) of the opening (48),
    and/or
    the electric plug (52) which has already been mounted is first of all guided through the opening (48) of the at least one covering cap (8), and the elastic stretching of the at least one covering cap (8) is subsequently carried out, and/or
    the covering cap (8), in particular an axial supporting section (51), is stretched, in particular is stretched in the radial direction (41), and the covering cap (8), in particular the axial supporting section (51), is subsequently fastened on the remaining high pressure pump (1) with an elastic prestress.
  14. Method according to one or more of Claims 11 to 13,
    characterized in that
    the at least one covering cap (8) is stretched, by the covering cap (8) being pushed onto the high pressure pump (1) on the outer side in the axial direction (40), and the axial movement of the at least one covering cap (8) bringing about the, in particular, radial, stretching of the at least one covering (8) on account of the outer-side geometry of the high pressure pump (1).
  15. High pressure injection system (36) for an internal combustion engine (39), in particular for a motor vehicle (38), comprising
    a high pressure pump (1),
    a high pressure rail (30),
    preferably a prefeed pump (35) for delivering a fuel from a fuel tank (32) to the high pressure pump (1),
    characterized in that
    the high pressure pump (1) is configured as a high pressure pump (1) according to one or more of Claims 1 to 10.
EP16763546.5A 2015-10-26 2016-09-13 High-pressure pump Active EP3368764B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015220870.2A DE102015220870A1 (en) 2015-10-26 2015-10-26 high pressure pump
PCT/EP2016/071565 WO2017071867A1 (en) 2015-10-26 2016-09-13 High-pressure pump

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EP3368764A1 EP3368764A1 (en) 2018-09-05
EP3368764B1 true EP3368764B1 (en) 2021-02-17

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US (1) US10851749B2 (en)
EP (1) EP3368764B1 (en)
CN (1) CN108291517B (en)
DE (1) DE102015220870A1 (en)
WO (1) WO2017071867A1 (en)

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CN114483399B (en) * 2022-02-22 2023-03-28 安徽江淮汽车集团股份有限公司 High-pressure oil pump protective cover cap of diesel engine

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EP3368764A1 (en) 2018-09-05
CN108291517A (en) 2018-07-17
US10851749B2 (en) 2020-12-01
US20180363609A1 (en) 2018-12-20
DE102015220870A1 (en) 2017-04-27
WO2017071867A1 (en) 2017-05-04
CN108291517B (en) 2020-08-04

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