WO2004051083A1 - High pressure pump for a fuel injection device of an internal combustion engine - Google Patents

High pressure pump for a fuel injection device of an internal combustion engine Download PDF

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Publication number
WO2004051083A1
WO2004051083A1 PCT/DE2003/002702 DE0302702W WO2004051083A1 WO 2004051083 A1 WO2004051083 A1 WO 2004051083A1 DE 0302702 W DE0302702 W DE 0302702W WO 2004051083 A1 WO2004051083 A1 WO 2004051083A1
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WO
WIPO (PCT)
Prior art keywords
pressure pump
pump
ring
coating
drive shaft
Prior art date
Application number
PCT/DE2003/002702
Other languages
German (de)
French (fr)
Inventor
Guenter Schneider
Alexander Schattke
Sascha Henke
Markus Koch
Wolfram Rittmannsberger
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
Priority to EP03799427A priority Critical patent/EP1583908A1/en
Publication of WO2004051083A1 publication Critical patent/WO2004051083A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0413—Cams
    • 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
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/12—Coating

Definitions

  • the invention relates to a high-pressure pump for a fuel injection device of an internal combustion engine according to the preamble of claim 1.
  • Such a high pressure pump is known from DE 198 29 548 AI.
  • This high-pressure pump has a drive shaft and at least one pump element with a pump piston driven in one stroke by the drive shaft.
  • the drive shaft has a shaft section which is formed eccentrically to its axis of rotation and on which a ring is rotatably mounted.
  • the pump piston is supported on the ring by a support element. The rotary movement of the drive shaft is converted into a stroke movement of the pump piston via the ring, which does not rotate with the drive shaft.
  • High forces act in the contact area between the ring and the support element due to the pressure generated by the pump piston.
  • High pressure pump must be generated. Furthermore, the introduction of low-sulfur fuels is likely to result in an increased tribological load. This increases the load on the components of the high-pressure pump and increases the wear on the ring and the support element. For this reason, it may not be possible to guarantee a sufficient service life for the high-pressure pump.
  • the high-pressure pump according to the invention with the features according to claim 1 has the advantage that the wear resistance of the ring and the support element is improved in such a way that the high-pressure pump also has a sufficient service life when generating very high pressures and poor lubrication.
  • FIG. 1 shows a high-pressure pump in a longitudinal section
  • FIG. 2 shows the high-pressure pump in a cross section along line II-II in FIG. 1.
  • the high-pressure pump delivers fuel under high pressure of up to 2000 bar, for example into a memory from which fuel is taken for injection at the internal combustion engine.
  • the high-pressure pump has a housing 10 in which a drive shaft 12 is rotatably mounted about an axis 13. At least one, preferably a plurality of pump elements 14, which are driven by the drive shaft 12, are arranged in the housing 10.
  • the drive shaft 12 has an eccentric to its axis of rotation 13 trained shaft section 16 on which a ring 18 is rotatably mounted.
  • the pump elements 14 each have a pump piston 20 which is displaceably and sealingly guided in a cylinder bore 22 which extends at least approximately radially to the axis of rotation 13 of the drive shaft 12.
  • the pump piston 20 of each pump element 14 is supported with its piston foot 21 via a support element 24 on the ring 18.
  • the piston foot 21 can be in contact with a spring 26, which is supported on the one hand on the housing 10 and on the other hand via a spring plate 23 on the support element 24
  • Support element 24 and be held on this on the ring 18.
  • the support element 24 can be designed, for example, as a support plate or as a plunger.
  • Pump working space 28 delimited, which can be connected to a fuel supply by an inlet valve 30 opening into the pump working space 28 and in which there is low pressure.
  • the pump work chamber 28 can also be connected to the accumulator by an outlet valve 32 opening towards the accumulator.
  • the ring 18 has according to the number of pump elements 14 on its outside flats 34 on which the respective support element 24 abuts. During the operation of the high-pressure pump, the ring 18 and the support elements 24 are subjected to the cyclical loading and unloading of the pump pistons 20 during their delivery stroke and suction stroke, by varying pressure forces in the
  • the amount of fuel delivered by the high-pressure pump can be adapted to the requirements of the internal combustion engine.
  • the inflow of fuel into the pump work spaces 28 can be limited in such a way that they are only partially filled. This can be done, for example, by means of suction throttling in the inlet to the pump work rooms 28.
  • the ring 18 is provided on its outside, at least on the flats 34, which represent the contact area with the support elements 24, with a coating 40 with high hardness and wear resistance.
  • the ring 18 is preferably made of steel and the coating 40 consists of tetrahedrally coordinated amorphous carbon.
  • the coating 40 is at least substantially free of hydrogen and unsaturated carbon compounds.
  • the coating 40 has a thickness of approximately 1 ⁇ m to several ⁇ m.
  • the hardness of the coating 40 is more than 4000 HV corresponding to 40 Gpa, preferably approximately 8000 HV corresponding to 80 GPa.
  • the coating 40 has a coefficient of friction against steel as a friction partner without lubrication of approximately 0.1 to 0.2.
  • the coating 40 has very good adhesion and low brittleness, so that it is not damaged even in the case of the impact stress described above.
  • the coating 40 is made by PVD, plasma vapor discharge, applied to the ring 18, it being possible initially to apply an intermediate layer to the ring 18, to which the coating 40 is then applied.
  • the adhesion of the coating 40 to the ring 18 is improved by the intermediate layer.
  • a graphite electrode is atomized in an electric arc and a carbon plasma is generated, from which the coating 40 is then deposited on the ring 18.
  • the support elements 24 can also be provided in their contact area with the ring 18 with a corresponding coating 40 made of tetrahedrally coordinated carbon.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Disclosed is a high pressure pump comprising a drive shaft (12) and at least one pump element (14) which is provided with a pump piston (20) that is driven in one direction of travel by means of the drive shaft (12). A ring (18) upon which the pump piston (20) rests via a supporting element (24) is rotatably mounted on a section (16) of the drive shaft (12), said section being disposed eccentric to the axis of rotation (13) thereof. The ring (18) and/or the supporting element (24) is/are provided with a coating (40) made of tetrahedrally coordinated amorphous carbon, at least in the contact area thereof.

Description

Hochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer BrennkraftmaschineHigh pressure pump for a fuel injector of an internal combustion engine
Stand der TechnikState of the art
Die Erfindung geht aus von einer Hochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine nach der Gattung des Anspruchs 1.The invention relates to a high-pressure pump for a fuel injection device of an internal combustion engine according to the preamble of claim 1.
Eine solche Hochdruckpumpe ist durch die DE 198 29 548 AI bekannt. Diese Hochdruckpumpe weist eine Antriebswelle und wenigstens ein Pumpenelement mit einem durch die Antriebswelle in einer Hubbewegung angetriebenen Pumpenkolben auf. Die Antriebswelle weist einen exzentrisch zu ihrer Drehachse ausgebildeten Wellenabschnitt auf, auf dem ein Ring drehbar gelagert ist. Der Pumpenkolben stützt sich über ein Stützelement am Ring ab. Die Drehbewegung der Antriebswelle wird über den Ring, der sich nicht mit der Antriebswelle mitdreht, in eine Hubbewegung des Pumpenkolbens umgewandelt. Im Kontaktbereich zwischen dem Ring und dem Stützelement wirken infolge des vom Pumpenkolben erzeugten Drucks hohe Kräfte. Zur weiteren Verbrauchs- und Schadstoffemissionsreduzierung bei Brennkraftmaschinen werden immer höhere Drücke bei der Kraftstoffeinspritzung benötigt, die durch dieSuch a high pressure pump is known from DE 198 29 548 AI. This high-pressure pump has a drive shaft and at least one pump element with a pump piston driven in one stroke by the drive shaft. The drive shaft has a shaft section which is formed eccentrically to its axis of rotation and on which a ring is rotatably mounted. The pump piston is supported on the ring by a support element. The rotary movement of the drive shaft is converted into a stroke movement of the pump piston via the ring, which does not rotate with the drive shaft. High forces act in the contact area between the ring and the support element due to the pressure generated by the pump piston. To further reduce consumption and pollutant emissions in internal combustion engines, ever higher pressures are required in fuel injection, which are caused by the
Hochdruckpumpe erzeugt werden müssen. Weiterhin ist durch die Einführung von schwefelarmen Kraftstoffen mit erhöhter tribologischer Belastung zu rechnen. Hierdurch steigt die Belastung der Bauteile der Hochdruckpumpe und der Verschleiß des Rings und des Stützelements nimmt zu. Aus diesem Grund kann unter Umständen keine ausreichende Lebensdauer der Hochdruckpumpe mehr gewährleistet werden. Vorteile der ErfindungHigh pressure pump must be generated. Furthermore, the introduction of low-sulfur fuels is likely to result in an increased tribological load. This increases the load on the components of the high-pressure pump and increases the wear on the ring and the support element. For this reason, it may not be possible to guarantee a sufficient service life for the high-pressure pump. Advantages of the invention
Die erfindungsgemäße Hochdruckpumpe mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, dass die Verschleißbeständigkeit des Rings und des Stützelements derart verbessert ist, dass die Hochdruckpumpe auch bei der Erzeugung sehr hoher Drücke und schlechter Schmierung eine ausreichende Lebensdauer aufweist.The high-pressure pump according to the invention with the features according to claim 1 has the advantage that the wear resistance of the ring and the support element is improved in such a way that the high-pressure pump also has a sufficient service life when generating very high pressures and poor lubrication.
In den abhängigen Ansprüchen sind vorteilhafteIn the dependent claims are advantageous
Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Hochdruckpumpe angegeben.Refinements and developments of the high-pressure pump according to the invention are specified.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Hochdruckpumpe in einem Längsschnitt und Figur 2 die Hochdruckpumpe in einem Querschnitt entlang Linie II-II in Figur 1.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. FIG. 1 shows a high-pressure pump in a longitudinal section and FIG. 2 shows the high-pressure pump in a cross section along line II-II in FIG. 1.
Beschreibung des AusführungsbeispielsDescription of the embodiment
In den Figuren 1 und 2 ist eine Hochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine beispielsweise eines Kraftfahrzeugs dargestellt, die als Radialkolbenpumpe ausgebildet ist. Durch die Hochdruckpumpe wird dabei Kraftstoff unter Hochdruck von bis zu 2000 bar gefördert, beispielsweise in einen Speicher, aus dem Kraftstoff zur Einspritzung an der Brennkraftmaschine entnommen wird. Die Hochdruckpumpe weist ein Gehäuse 10 auf, in dem eine Antriebswelle 12 um eine Achse 13 drehbar gelagert ist. Im Gehäuse 10 sind wenigstens ein, vorzugsweise mehrere Pumpenelemente 14 angeordnet, die durch die Antriebswelle 12 angetrieben werden. Die Antriebswelle 12 weist einen exzentrisch zu ihrer Drehachse 13 ausgebildeten Wellenabschnitt 16 auf, auf dem ein Ring 18 drehbar gelagert ist. Die Pumpenelemente 14 weisen jeweils einen Pumpenkolben 20 auf, der in einer zumindest annähernd radial zur Drehachse 13 der Antriebswelle 12 verlaufenden Zylinderbohrung 22 verschiebbar dicht geführt ist. Der Pumpenkolben 20 jedes Pumpenelements 14 stützt sich mit seinem Kolbenfuß 21 über ein Stützelement 24 am Ring 18 ab. Der Kolbenfuß 21 kann dabei durch eine Feder 26, die sich einerseits am Gehäuse 10 und andererseits über einen Federteller 23 am Stützelement 24 abstützt, in Anlage am1 and 2 show a high-pressure pump for a fuel injection device of an internal combustion engine, for example a motor vehicle, which is designed as a radial piston pump. The high-pressure pump delivers fuel under high pressure of up to 2000 bar, for example into a memory from which fuel is taken for injection at the internal combustion engine. The high-pressure pump has a housing 10 in which a drive shaft 12 is rotatably mounted about an axis 13. At least one, preferably a plurality of pump elements 14, which are driven by the drive shaft 12, are arranged in the housing 10. The drive shaft 12 has an eccentric to its axis of rotation 13 trained shaft section 16 on which a ring 18 is rotatably mounted. The pump elements 14 each have a pump piston 20 which is displaceably and sealingly guided in a cylinder bore 22 which extends at least approximately radially to the axis of rotation 13 of the drive shaft 12. The pump piston 20 of each pump element 14 is supported with its piston foot 21 via a support element 24 on the ring 18. The piston foot 21 can be in contact with a spring 26, which is supported on the one hand on the housing 10 and on the other hand via a spring plate 23 on the support element 24
Stützelement 24 und über dieses am Ring 18 gehalten werden. Das Stützelement 24 kann beispielsweise als Stützplatte oder als Stößel ausgebildet sein.Support element 24 and be held on this on the ring 18. The support element 24 can be designed, for example, as a support plate or as a plunger.
Durch den jeweiligen Pumpenkolben 20 wird einBy the respective pump piston 20 is a
Pumpenarbeitsraum 28 begrenzt, der durch ein in den Pumpenarbeitsraum 28 öffnendes Einlassventil 30 mit einer KraftstoffZuführung verbindbar ist, in der Niederdruck herrscht. Der Pumpenarbeitsraum 28 ist außerdem durch ein zum Speicher hin öffnendes Auslassventil 32 mit dem Speicher verbindbar. Bei der Rotation der Antriebswelle 12 wird der Pumpenkolben 20 über den exzentrischen Wellenabschnitt 16 der Antriebswelle 12 und den Ring 18, der sich nicht mit der Antriebswelle 12 mitdreht, in einer Hubbewegung angetrieben. Wenn der Pumpenkolben 20 sich radial nach innen bewegt, so führt dieser einen Saughub aus, wobei das Einlassventil 30 geöffnet ist, so dass Kraftstoff in den Pumpenarbeitsraum 28 einströmt, während das Auslassventil 32 geschlossen ist. Wenn der Pumpenkolben 20 sich radial nach außen bewegt, so führt dieser einen Förderhub aus, wobei das Einlassventil 30 geschlossen ist und der vom Pumpenkolben 20 verdichtete Kraftstoff durch das geöffnete Auslassventil 32 unter hohem Druck in den Speicher gelangt.Pump working space 28 delimited, which can be connected to a fuel supply by an inlet valve 30 opening into the pump working space 28 and in which there is low pressure. The pump work chamber 28 can also be connected to the accumulator by an outlet valve 32 opening towards the accumulator. When the drive shaft 12 rotates, the pump piston 20 is driven in a stroke movement via the eccentric shaft section 16 of the drive shaft 12 and the ring 18, which does not rotate with the drive shaft 12. When the pump piston 20 moves radially inward, it carries out a suction stroke, the inlet valve 30 being open, so that fuel flows into the pump working chamber 28 while the outlet valve 32 is closed. When the pump piston 20 moves radially outward, it carries out a delivery stroke, the inlet valve 30 being closed and the fuel compressed by the pump piston 20 reaching the accumulator under high pressure through the opened outlet valve 32.
Der Ring 18 weist entsprechend der Anzahl der Pumpenelemente 14 an seiner Außenseite Abflachungen 34 auf, an denen das jeweilige Stützelement 24 anliegt. Während des Betriebs der Hochdruckpumpe werden der Ring 18 und die Stützelemente 24 durch die zyklische Belastung und Entlastung der Pumpenkolben 20 bei deren Förderhub und Saughub schwingend belastet, indem unterschiedlich hohe Druckkräfte imThe ring 18 has according to the number of pump elements 14 on its outside flats 34 on which the respective support element 24 abuts. During the operation of the high-pressure pump, the ring 18 and the support elements 24 are subjected to the cyclical loading and unloading of the pump pistons 20 during their delivery stroke and suction stroke, by varying pressure forces in the
Kontaktbereich zwischen den Stützelementen 24 und dem Ring 18 wirken. Vorzugsweise ist vorgesehen, dass die durch die Hochdruckpumpe geförderte Kraftstoffmenge an den Bedarf der Brennkraftmaschine angepasst werden kann. Hierzu kann der Zulauf von Kraftstoff in die Pumpenarbeitsräume 28 derart begrenzt werden, dass diese nur teilweise befüllt werden. Dies kann beispielsweise mittels einer Saugdrosselung im Zulauf zu den Pumpenarbeitsräumen 28 erfolgen. Bei einer Teilbefüllung der Pumpenarbeitsräume 28 treten zusätzlich schlagende Belastungen des Rings 18 und der Stützelemente 24 auf, da die Kraftstofförderung und damit die Druckbelastung des Rings 18 und der Stützelemente 24 erst nach einem teilweisen Leerhub der Pumpenkolben 20 erfolgt.Contact area between the support members 24 and the ring 18 act. It is preferably provided that the amount of fuel delivered by the high-pressure pump can be adapted to the requirements of the internal combustion engine. For this purpose, the inflow of fuel into the pump work spaces 28 can be limited in such a way that they are only partially filled. This can be done, for example, by means of suction throttling in the inlet to the pump work rooms 28. When the pump working spaces 28 are partially filled, striking loads on the ring 18 and the support elements 24 also occur, since the fuel delivery and thus the pressure load on the ring 18 and the support elements 24 only take place after the pump pistons 20 have been partially empty.
Der Ring 18 ist an seiner Außenseite zumindest an den Abflachungen 34, die den Kontaktbereich zu den Stützelementen 24 darstellen, mit einer Beschichtung 40 mit hoher Härte und Verschleißbeständigkeit versehen. Der Ring 18 besteht vorzugsweise aus Stahl und die Beschichtung 40 besteht aus tetraedrisch koordiniertem amorphem Kohlenstoff. Die Beschichtung 40 ist zumindest im wesentlichen frei von Wasserstoff und ungesättigten KohlenstoffVerbindungen. Die Beschichtung 40 weist eine Dicke von etwa 1 μm bis zu mehreren μm auf. Die Härte der Beschichtung 40 beträgt mehr als 4000 HV entsprechend 40 Gpa, vorzugsweise etwa 8000 HV entsprechend 80 GPa. Die Beschichtung 40 besitzt einen Reibwert gegen Stahl als Reibpartner ohne Schmierung von etwa 0,1 bis 0,2. Die Beschichtung 40 weist eine sehr gute Haftung und eine geringe Sprödigkeit auf, so dass diese auch bei der vorstehend erläuterten schlagenden Belastung nicht beschädigt wird. Die Beschichtung 40 wird durch PVD, plasma vapor discharge, auf den Ring 18 aufgebracht, wobei auf den Ring 18 zunächst eine Zwischenschicht aufgebracht werden kann, auf die dann die Beschichtung 40 aufgebracht wird. Durch die Zwischenschicht wird die Haftung der Beschichtung 40 auf dem Ring 18 verbessert. Beim Aufbringen der Beschichtung 40 wird eine Graphitelektrode in einem elektrischen Lichtbogen zerstäubt und ein Kohlenstoffplasma erzeugt, aus dem sich dann die Beschichtung 40 auf dem Ring 18 abscheidet.The ring 18 is provided on its outside, at least on the flats 34, which represent the contact area with the support elements 24, with a coating 40 with high hardness and wear resistance. The ring 18 is preferably made of steel and the coating 40 consists of tetrahedrally coordinated amorphous carbon. The coating 40 is at least substantially free of hydrogen and unsaturated carbon compounds. The coating 40 has a thickness of approximately 1 μm to several μm. The hardness of the coating 40 is more than 4000 HV corresponding to 40 Gpa, preferably approximately 8000 HV corresponding to 80 GPa. The coating 40 has a coefficient of friction against steel as a friction partner without lubrication of approximately 0.1 to 0.2. The coating 40 has very good adhesion and low brittleness, so that it is not damaged even in the case of the impact stress described above. The coating 40 is made by PVD, plasma vapor discharge, applied to the ring 18, it being possible initially to apply an intermediate layer to the ring 18, to which the coating 40 is then applied. The adhesion of the coating 40 to the ring 18 is improved by the intermediate layer. When the coating 40 is applied, a graphite electrode is atomized in an electric arc and a carbon plasma is generated, from which the coating 40 is then deposited on the ring 18.
Alternativ oder zusätzlich zum Ring 18 können auch die Stützelemente 24 in ihrem Kontaktbereich mit dem Ring 18 mit einer entsprechenden Beschichtung 40 aus tetraedrisch koordiniertem Kohlenstoff versehen werden. Alternatively or in addition to the ring 18, the support elements 24 can also be provided in their contact area with the ring 18 with a corresponding coating 40 made of tetrahedrally coordinated carbon.

Claims

Ansprüche Expectations
1. Hochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine, mit einer Antriebswelle (12) , mit wenigstens einem Pumpenelement (14) , das einen durch die Antriebswelle (12) in einer Hubbewegung angetriebenen1. High-pressure pump for a fuel injection device of an internal combustion engine, with a drive shaft (12), with at least one pump element (14), which is driven by the drive shaft (12) in a stroke movement
Pumpenkolben (20) aufweist, wobei auf einem exzentrisch zu deren Drehachse (13) angeordneten Abschnitt (16) der Antriebswelle (12) ein Ring (18) drehbar gelagert ist, auf dem sich der Pumpenkolben (20) über ein Stützelement (24) abstützt, dadurch gekennzeichnet, dass der Ring (18) und/oder das Stützelement (24) zumindest in deren Kontaktbereich mit einer Beschichtung (40) aus tetraedrisch koordiniertem amorphem Kohlenstoff versehen ist.Pump piston (20), a ring (18) on which the pump piston (20) is supported by a support element (24) is rotatably mounted on a section (16) of the drive shaft (12) arranged eccentrically to its axis of rotation (13) , characterized in that the ring (18) and / or the support element (24) is provided at least in their contact area with a coating (40) made of tetrahedrally coordinated amorphous carbon.
2. Hochdruckpumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Beschichtung (40) zumindest nahezu frei von Wasserstoff ist.2. High-pressure pump according to claim 1, characterized in that the coating (40) is at least almost free of hydrogen.
3. Hochdruckpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Beschichtung (40) zumindest nahezu ausschließlich aus Kohlenstoffbindungen besteht.3. High pressure pump according to claim 1 or 2, characterized in that the coating (40) consists at least almost exclusively of carbon bonds.
4. Hochdruckpumpe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Beschichtung (40) eine Dicke zwischen etwa 1 μm und 10 μm aufweist.4. High-pressure pump according to one of claims 1 to 3, characterized in that the coating (40) has a thickness between about 1 micron and 10 microns.
5. Hochdruckpumpe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Beschichtung (40) eine Härte von mehr als 4000 HV, vorzugsweise von etwa 8000 HV aufweist. 5. High-pressure pump according to one of claims 1 to 4, characterized in that the coating (40) has a hardness of more than 4000 HV, preferably of about 8000 HV.
PCT/DE2003/002702 2002-12-04 2003-08-11 High pressure pump for a fuel injection device of an internal combustion engine WO2004051083A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03799427A EP1583908A1 (en) 2002-12-04 2003-08-11 High pressure pump for a fuel injection device of an internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002156525 DE10256525A1 (en) 2002-12-04 2002-12-04 High pressure pump for a fuel injector of an internal combustion engine
DE10256525.2 2002-12-04

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WO2010012701A1 (en) * 2008-07-28 2010-02-04 Robert Bosch Gmbh Anti-wear layer system and component comprising an anti-wear layer arrangement

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DE102004041235A1 (en) * 2004-08-26 2006-03-02 Ina-Schaeffler Kg Wear resistant coating and method of making same
DE102008043993B3 (en) * 2008-11-21 2010-04-29 Thielert Aircraft Engines Gmbh Common-rail high-pressure pump

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US5937734A (en) * 1996-08-30 1999-08-17 Robert Bosch Gmbh Reciprocating pump
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EP0984161A1 (en) * 1998-03-19 2000-03-08 Sumitomo Electric Industries, Ltd. Combination of shim and cam
FR2794180A1 (en) * 1999-03-09 2000-12-01 Toyota Motor Co Ltd High pressure fuel injection pump for diesel and other internal combustion engines is activated by cam control consisting of cam, roll in sliding contact with cam, and support in sliding contact with roll

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US2168850A (en) * 1936-10-28 1939-08-08 Towler John Maurice Reciprocating ram pump
US5573386A (en) * 1994-01-29 1996-11-12 Robert Bosch Gmbh Reciprocating piston pump
US5937734A (en) * 1996-08-30 1999-08-17 Robert Bosch Gmbh Reciprocating pump
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EP1583908A1 (en) 2005-10-12

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