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EP1633971B1 - Pompe a pistons radiaux pour production de haute pression pour carburant dans des systemes d'injection de carburant de moteurs a combustion interne - Google Patents

Pompe a pistons radiaux pour production de haute pression pour carburant dans des systemes d'injection de carburant de moteurs a combustion interne Download PDF

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Publication number
EP1633971B1
EP1633971B1 EP04736393A EP04736393A EP1633971B1 EP 1633971 B1 EP1633971 B1 EP 1633971B1 EP 04736393 A EP04736393 A EP 04736393A EP 04736393 A EP04736393 A EP 04736393A EP 1633971 B1 EP1633971 B1 EP 1633971B1
Authority
EP
European Patent Office
Prior art keywords
ceramic
running roller
piston
piston pump
radial piston
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.)
Expired - Lifetime
Application number
EP04736393A
Other languages
German (de)
English (en)
Other versions
EP1633971A1 (fr
Inventor
Gerhard Breuer
Claudia Kohler
Franz Rückert
Karl-Heinz Thiemann
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1633971A1 publication Critical patent/EP1633971A1/fr
Application granted granted Critical
Publication of EP1633971B1 publication Critical patent/EP1633971B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04B1/0426—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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • 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
    • F02M59/44—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
    • F02M59/445—Selection of particular materials
    • 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
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • 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
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F05C2203/0804—Non-oxide ceramics
    • F05C2203/083—Nitrides
    • F05C2203/0843—Nitrides of silicon
    • 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
    • F05C2251/00—Material properties
    • F05C2251/10—Hardness

Definitions

  • the invention relates to a radial piston pump for fuel high pressure generation in fuel injection systems of internal combustion engines, in particular in a common rail injection system, with a mounted in a pump housing drive shaft with an eccentric shaft portion on which a roller is mounted, and preferably with a plurality of radial relative to the drive shaft arranged in a respective cylinder piston, at whose ends facing the roller respectively a Kolbenfußplatte is arranged, which contacts the peripheral surface of the roller, according to the preamble of claim 1.
  • Such a radial piston pump is known for example from DE 198 09 315 A1.
  • the Kolbenfußplatte and the roller of the known radial piston pump are usually made of case-hardened steel or made of tempered steel. Over time, however, these components may experience sliding wear due to adhesion, abrasion, or surface disruption. This undesirable wear can lead to a failure of the radial piston pump and thus also to a failure of the internal combustion engine.
  • DE 199 05 462 A1 discloses a radial piston pump with a piston made of zirconia, alumina-zirconia or alumina ceramic.
  • the present invention has for its object to further develop a radial piston pump of the type mentioned in such a way that its reliability is increased.
  • the area of the piston footplate contacting the peripheral surface of the roller has an insert made of a wear-resistant material, namely hard metal, a ceramic material, a cast carbide material or cermet, and / or at least part of the roller, in particular at least one part
  • a wear-resistant material namely made of hard metal, a sintered tool steel or an alloyed nitriding steel
  • the materials mentioned have a significantly higher modulus of elasticity compared with the steel materials used hitherto, which results in lower deformations under load and consequently also in a more uniform surface pressure without appreciable stress peaks.
  • ceramic materials especially their lower weight plays a role, resulting in a low inertia of the roller and the Kolbenfußplatte.
  • the piston is made of a ceramic material, preferably of a Si 3 N 4 - or a ZrO 2 ceramic and is produced by extrusion and has a porosity of less than 5%, wherein the surface is infiltrated with MoS 2 .
  • the piston is isostatically extruded and sintered. This results in a very smooth surface with a low coefficient of friction, which also has a favorable effect on the wear behavior.
  • the roller can be made entirely of the wear-resistant material or it consists as before of case-hardened steel or tempered steel and carries at least one insert of the wear-resistant material.
  • inserts brings the advantage of a modular construction, ie that of a standardized roller and a standardized
  • Kolbenfußplatte can each be provided with inserts of different material and thus a variety of mating variants can be generated.
  • the roller is made of tempered steel and has tungsten carbide inserts such as G20, GC37 or GC20, and the piston footplate has a ceramic insert such as Si 3 N 4 ceramic, shell casting such as SoGSH or cermet.
  • the castor consists of a precision casting such as GX-210WCr13 H and the piston foot disc has a ceramic insert such as Si 3 N 4 ceramic, carbide such as G20 or cermet.
  • the castor is made of a cast carbide material such as SoGGH shell casting and the piston footplate has a ceramic insert such as Si 3 N 4 ceramic, hard metal such as G20 or cermet.
  • the roller is made of sintered tool steel such as ASP23 or an alloyed nitriding steel and the piston footplate has a ceramic insert such as Si 3 N 4 ceramic, hard metal such as G20, cermet or a cast carbide material such as SoGGH.
  • the alloyed nitriding steel can contain C and / or Cr and / or V and / or Mo, is gas-nitrided and, in the area of contact with the piston footplate, free of bonding layers.
  • the surface of the Kolbenfußplatte and / or the roller has a roughness R z between 0.15 microns and 2 microns.
  • the ceramic material has a roughness R z between 0.15 microns and 0.5 microns
  • the carbide a roughness R z between 0.3 microns and 1.0 microns
  • the cast carbide a roughness R z between 0.5 microns and 2.0 ⁇ m.
  • the roller has on its peripheral surface at least one transverse groove extending transversely to the direction of movement.
  • the piston foot plate may also have at least two intersecting grooves on its surface facing the roller. Fuel can accumulate in these grooves acting as a stagnation gap, which promotes the formation of a hydrodynamic sliding film due to the sliding movement between the circumferential surface of the roller and the piston foot plate, whereby the wear on the sliding surfaces is further reduced.
  • the radial piston pump 1 shown in FIG. 1 is preferably used for generating the system pressure for the high-pressure accumulator (rail) of a common-rail injection system of a self-igniting internal combustion engine. It comprises a drive shaft 4 mounted in a pump housing 2 and having an eccentric shaft section 6 on which a polygonal roller 8 rotatable relative to the shaft section 6 is received.
  • the polygonal roller 8 has along its peripheral surface 10 with circumferential distance from one another arranged, planar flat portions 12.
  • the piston foot plate 18 is preferably connected by means of a spherical bearing 20 with the drive shaft 4 facing the end of the piston 16 pivotally.
  • the spherical bearing 20 is realized, for example, in that the piston end is formed as a partial ball 22, which engages in a complementarily formed spherical recess 24 in the Kolbenfußplatte 18.
  • the Kolbenfußplatte 18 is biased together with the piston 16 by a spring 26 against the associated flat portion 12 of the roller 8.
  • the operation of such a radial piston pump 1 is for example in DE 198 02 475 A1 described, therefore, should not be discussed further here.
  • At least the peripheral surface 10 of the roller 8 contacting surface 28 of the Kolbenfußplatte 18 consists of a wear-resistant material, namely of hard metal, a ceramic material, a cast carbide material or cermet.
  • a wear-resistant material namely of hard metal, a ceramic material, a cast carbide material or cermet.
  • the insert 30 may be positively and / or materially connected to the remaining Kolbenfußplatte 18, for example by gluing or by soldering.
  • the insert 30 may, as shown in Figure 1, extend over the entire contact surface 28 of the Kolbenfußplatte 18 with the roller 8 or only over part of it.
  • the entire Kolbenfußplatte 18 may be made of the wear-resistant material, so that no additional insert 30 is necessary.
  • Hard metals may for example consist of G20, GC37 or GC20, while the cast carbide material may include a chilled cast material, in particular GGH or SoGGH.
  • the piston 16 itself may be made of wear-resistant material, for example of a Si 3 N 4 - or a ZrO 2 ceramic.
  • the piston 16 can be made by extrusion and have a porosity of less than 5%, the surface being infiltrated with MoS 2 .
  • the piston 16 may also be isostatically pressed and sintered.
  • At least part of the roller 8, in particular the flat sections 12, consists of a wear-resistant material, namely of hard metal, of a precision casting material, made of a cast carbide material, a sintered tool steel or an alloyed nitriding steel.
  • the flat portions 12 are each provided with an insert 32 made of the wear-resistant material, as shown in Fig.1.
  • Such insert 32 is positively and / or cohesively received in each case in a complementary shaped recess 34 in the flat portion 12, for example by gluing or by soldering.
  • the entire roller 8 may consist of the wear-resistant material.
  • hard metals are used here, which have low adhesion coefficients.
  • GX-210WCr13 H forms a suitable investment casting material.
  • SoGGH grade material
  • the sintered tool steel is ASP23.
  • a nitriding steel alloyed specifically by nitriding or gas nitriding with Cr and / or Mo and / or V and / or C is used for a variant with gradient material.
  • the basic elements and the process parameters during nitriding lead to a deep diffusion with hardnesses of HV 750 to 850 with simultaneously higher strength of the base material.
  • the connecting layer forming in this process is removed by grinding for functional reasons.
  • the surfaces of Kolbenfußplatte 18 and the roller 8 have on the sliding surfaces preferably a roughness R z between 0.15 microns and 2 microns, depending on the materials used.
  • the lower limit for ceramics in particular a range from 0.15 ⁇ m to 0.5 ⁇ m, applies upper limit for metals such as SoGGH or ASP23.
  • a roughness R z of between 0.3 ⁇ m and 1 ⁇ m is provided.
  • a carbide zone is formed in each case in the region of the flat sections 12 of the roller 8, which is made of a cast steel material and is shown separately in FIG.
  • This carbidic zone is generated either by a targeted solidification rate during casting of the roller 8 or by remelting and then preferably forms the gradient material SoGGH.
  • the result is consequently a roller 8, in which a carbide zone 33 is formed in the area of the flat sections 12, while the remaining zones and areas of the roller 8 consist of cast steel with unchanged properties.
  • one or more transverse grooves 36 may be formed, as best seen with reference to Figure 6.
  • the transverse groove 36 is arranged in the center of a depression 29 forming a groove outlet of the flat section 12.
  • the depression 29 is formed by two planes arranged at an angle with respect to the flat section 12, in whose section line the transverse groove 36 lies.
  • the sink angle ⁇ of the sink 29 is, for example, less than 15 degrees.
  • the transition from the depression 29 and the flat portion 12 is rounded with a radius R 4 of preferably less than or equal to 1 mm.
  • the radius R 4 is generated, for example, by vibratory grinding.
  • the piston foot plate 18 is held by a plate holder 38 on the associated piston 16.
  • the Kolbenfußplatte 18 has on its the piston 16 facing surface on a circular recess 40 into which engages the spherical shaped end 42 of the piston 16 and the bottom of the recess 40 contacted.
  • the plate holder 38 is countered on the piston 16 by means of a snap ring 46 engaging in a groove 44 of the piston 16.
  • a complementarily shaped insert 30 is held from one of the wear-resistant materials described above, for example by material bond, in particular by soldering.
  • the insert 30 is provided on its side facing the roller 8 surface 31 at the edge with an angular outlet 35, wherein the outlet angle ⁇ is about 15 degrees.
  • the transition between this surface 31 and the outlet 35 is rounded with a radius R 2 of about 2 mm.
  • R 1 of less than or equal to 1 mm
  • the inserts 30 of the Kolbenfußplatte 18 preferably at least two intersecting grooves 50, as best Fig.3 shows. Due to the intersecting arrangement of the grooves 50, the likelihood is high that with respect to the piston foot plate 18 rotatable with respect to the plate holder 38, one of the grooves 50 is oriented transversely to the direction of motion to promote formation of a hydrodynamic lubricating film.
  • the grooves 50 are preferably produced by press-fitting. Thereby results in a lower notch effect compared to cutting processes, since the material fibers are not severed.
  • the grooves 50 are each arranged in the center of a groove forming a drain 39 of the surface 31.
  • the depression is formed by two planes arranged at an angle with respect to the surface 31, in whose section line the respective groove 50 lies.
  • the sink angle ⁇ of the depression 39 is, for example, 5 degrees.
  • the transition from the depression 39 and the surface 31 is rounded with a radius R 3 of preferably less than or equal to 1 mm.
  • the piston foot plate 18 is made entirely of one of the above-mentioned wear-resistant materials and is inserted into the through-hole 52 of a ring bushing 54 made of steel.
  • the connection between the annular bushing 54 and the Kolbenfußplatte 18 is preferably made by soldering.
  • wear-resistant material to the mutually associated sliding surfaces 12, 28 of the roller 8 and piston foot plate 18.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (14)

  1. Pompe à pistons radiaux (1) pour la génération d'une haute pression dans le carburant pour des systèmes d'injection de carburant de moteurs thermiques, en particulier pour un système d'injection dit "common rail", comportant un arbre d'entraînement (4) monté dans un boîtier de pompe (2) et présentant un tronçon d'arbre excentrique (6) sur lequel est monté un galet de roulement (8), et de préférence plusieurs pistons (16) agencés radialement par rapport à l'arbre d'entraînement (4) dans un cylindre respectif (14), pistons dont les extrémités tournées vers le galet de roulement (8) présentent chacune une plaque de pied de piston (18) qui vient en contact la surface périphérique (10, 12) du galet de roulement (8),
    caractérisée en ce que
    la surface (28, 31) de la plaque de pied de piston (18), qui vient en contact la surface périphérique (10, 12) du galet de roulement (8) comprend au moins un insert (30) en matériau résistant à l'usure, à savoir en métal dur, en matière céramique, en un matériau carburé coulé ou en cermet, et/ou en ce qu'une partie au moins du galet de roulement (8), en particulier une partie au moins de la surface périphérique (10, 12) du galet de roulement (8) est constituée en un matériau résistant à l'usure, à savoir en métal dur, en acier à outil fritté ou en acier nitruré allié.
  2. Pompe à pistons radiaux selon la revendication 1,
    caractérisée en ce que
    le piston (16) est constitué d'un matériau céramique.
  3. Pompe à pistons axiaux selon l'une des revendications précédentes,
    caractérisée en ce que
    le galet de roulement (8) est constitué d'un acier traité et comprend des inserts (32) en métal dur, tel que G20, GC37 ou GC20, et en ce que la plaque de pied de piston (18) comprend des inserts (30) en céramique, telle que de la céramique Si3N4, de la matière moulée trempée en surface, telle que SoGGH ou en cermet.
  4. Pompe à pistons radiaux selon la revendication 1 ou 2,
    caractérisée en ce que
    le galet de roulement (8) est constitué d'un matériau en fonte fine, tel que GX-210WCr13 H, et en ce que la plaque de pied de piston (18) présente des inserts (30) en céramique, telle que de la céramique Si3N4, en métal dur tel que G20 ou en cermet.
  5. Pompe à pistons radiaux selon la revendication 1 ou 2,
    caractérisée en ce que
    le galet de roulement (8) est constitué d'un matériau carburé coulé, tel que de la matière moulée trempée en surface SoGGH, et en ce que la plaque de pied de piston (18) comprend des inserts (30) en céramique telle que de la céramique Si3N4, en métal dur tel que G20 ou en cermet.
  6. Pompe à pistons radiaux selon la revendication 1 ou 2,
    caractérisée en ce que
    le galet de roulement (8) est constitué en acier à outil fritté, tel que ASP23, ou en acier nitruré allié, et en ce que la plaque de pied de piston (18) comprend des inserts (30) en céramique telle que de la céramique Si3N4, en métal dur tel que G20, en cermet ou en matériau carburé coulé, tel que SoGGH.
  7. Pompe à pistons radiaux selon la revendication 6,
    caractérisée en ce que
    l'acier nitruré allié contient du C et/ou du Cr et/ou du V et/ou du Mo, il est nitruré au gaz et exempt de couche de liaison dans la zone de contact avec la plaque de pied de piston (18).
  8. Pompe à pistons radiaux selon l'une des revendications précédentes,
    caractérisée en ce que
    le galet de roulement (8) comprend sur sa surface périphérique (10, 12) au moins un insert (32) du matériau respectif résistant à l'usure.
  9. Pompe à pistons radiaux selon l'une des revendications précédentes,
    caractérisée en ce que
    le galet de roulement (8) comprend sur sa surface périphérique (10, 12) au moins une gorge transversale (36) qui s'étend transversalement à la direction de mouvement.
  10. Pompe à pistons radiaux selon l'une des revendications précédentes,
    caractérisée en ce que
    la plaque de pied de piston (18) présente sur sa surface (31) tournée vers le galet de roulement (8) au moins deux gorges (50) qui se croisent.
  11. Pompe à pistons radiaux selon l'une des revendications précédentes,
    caractérisée en ce que
    la surface de la plaque de pied de piston (18) et/ou du galet de roulement (8) présente une profondeur de rugosité Rz entre 0,15 µm et 2 µm.
  12. Pompe à pistons radiaux selon la revendication 2,
    caractérisée en ce que
    le piston est constitué en une céramique Si3N4 ou en une céramique ZrO2.
  13. Pompe à pistons radiaux selon la revendication 11,
    caractérisée en ce que
    le piston (16) est réalisé par extrusion et présente une porosité inférieure à 5 %, la surface étant infiltrée avec du MoS2.
  14. Pompe à pistons radiaux selon la revendication 12,
    caractérisée en ce que
    le piston (16) est extrudé par voie isostatique et fritté.
EP04736393A 2003-06-14 2004-06-09 Pompe a pistons radiaux pour production de haute pression pour carburant dans des systemes d'injection de carburant de moteurs a combustion interne Expired - Lifetime EP1633971B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10326880A DE10326880A1 (de) 2003-06-14 2003-06-14 Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen
PCT/EP2004/006207 WO2004111435A1 (fr) 2003-06-14 2004-06-09 Pompe a pistons radiaux pour production de haute pression pour carburant dans des systemes d'injection de carburant de moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP1633971A1 EP1633971A1 (fr) 2006-03-15
EP1633971B1 true EP1633971B1 (fr) 2007-02-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04736393A Expired - Lifetime EP1633971B1 (fr) 2003-06-14 2004-06-09 Pompe a pistons radiaux pour production de haute pression pour carburant dans des systemes d'injection de carburant de moteurs a combustion interne

Country Status (6)

Country Link
US (1) US20060222517A1 (fr)
EP (1) EP1633971B1 (fr)
JP (1) JP2006527329A (fr)
KR (1) KR20060021377A (fr)
DE (2) DE10326880A1 (fr)
WO (1) WO2004111435A1 (fr)

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ES2542856T3 (es) * 2007-10-12 2015-08-12 Delphi International Operations Luxembourg S.À R.L. Mejoras relacionadas con bombas de combustible
JP4941272B2 (ja) * 2007-12-20 2012-05-30 株式会社デンソー ポンプ
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JP2006527329A (ja) 2006-11-30
KR20060021377A (ko) 2006-03-07
US20060222517A1 (en) 2006-10-05
DE502004003060D1 (de) 2007-04-12
WO2004111435A1 (fr) 2004-12-23
DE10326880A1 (de) 2004-12-30
EP1633971A1 (fr) 2006-03-15

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