EP1738074B1 - Pompe a pistons radiaux - Google Patents

Pompe a pistons radiaux Download PDF

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Publication number
EP1738074B1
EP1738074B1 EP04804728A EP04804728A EP1738074B1 EP 1738074 B1 EP1738074 B1 EP 1738074B1 EP 04804728 A EP04804728 A EP 04804728A EP 04804728 A EP04804728 A EP 04804728A EP 1738074 B1 EP1738074 B1 EP 1738074B1
Authority
EP
European Patent Office
Prior art keywords
pump
radial piston
lubrication pockets
lubrication
pockets
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.)
Not-in-force
Application number
EP04804728A
Other languages
German (de)
English (en)
Other versions
EP1738074A1 (fr
Inventor
Uwe Nigrin
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP1738074A1 publication Critical patent/EP1738074A1/fr
Application granted granted Critical
Publication of EP1738074B1 publication Critical patent/EP1738074B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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

Definitions

  • the invention relates to a radial piston pump, in particular a radial piston high-pressure pump for a fuel injection system, according to the preamble of patent claim 1.
  • a generic radial piston pump is from the DE 100 39 210 A1 known.
  • the radial piston pump has a drive shaft with an eccentric portion which is rotatably mounted in a pump housing. On the eccentric shaft portion a cam ring is slidably mounted.
  • the radial piston pump has three at a distance of 120 ° to each other arranged pump units. Each pump unit has a radially in the pump housing longitudinally movably guided pump piston.
  • the pump pistons abut each other on a sliding shoe, which is supported on the lifting ring.
  • the cam ring has a number of flats corresponding to the number of pump pistons.
  • In pump operation there is a relative movement between the sliding surface of the shoe and the flattening of the cam ring. Due to the relative movement, there is a high degree of closure of the components. In addition, the relative movement causes transverse forces are introduced into the pump piston, which can lead to a clamping of the piston.
  • the DE 196 35 164 A1 proposes to reduce the friction to form lubrication grooves in the flats on the cam ring, which are mounted substantially transversely to the relative movement between the piston and cam.
  • the DE 198 36 901 C2 which describes the closest prior art, proposes to form in the flattening of the cam ring lubricating grooves, which are arranged parallel to the direction of movement of the respective flattening relative to the associated piston.
  • the US 6,350,107 B1 discloses a radial piston pump with multiple pistons.
  • the plates each have a recess for reducing stresses in the center of the plate.
  • a disadvantage of such lubrication grooves is that the cross-sectional area of the lubrication grooves is relatively large in relation to the cross-sectional area of the entire flattening. As a result, the bearing surface decreases the flattening, causing increased wear occurs. In addition, the oil can be easily pushed out of the lubrication grooves, so that at high speeds no adequate lubrication of the sliding surfaces is guaranteed.
  • the radial piston pump according to the invention is characterized according to a first aspect in that in the flats of the cam ring and / or in the respective sliding surface of the shoe lubricating pockets are formed, the lubrication pockets are arranged at a regular distance from each other, and the lubrication pockets are arranged like a matrix or checkerboard.
  • a particularly good lubrication can be achieved.
  • the lubrication pockets support the construction of a hydrodynamic lubricating wedge during the relative movement of the slide shoe and the lifting ring.
  • the matrix-like or checkered arrangement allows the construction of a particularly uniform lubrication gap.
  • the radial piston pump according to the invention is characterized according to a second aspect in that in the flats of the cam ring and / or in the respective sliding surface of the shoe lubricating pockets are formed, the lubrication pockets are arranged at a regular distance from each other, and the lubrication pockets are arranged on circular paths, the run concentric to each other. This also makes it possible to achieve a particularly uniform lubrication gap.
  • the lubrication pockets preferably have an oval or triangular cross-section.
  • the lubrication pockets are arranged such that their longitudinal axis is preferably in the direction of the relative movement.
  • the bottom of the lubrication pockets has a constant depth.
  • Lubrication pockets with constant depth are particularly easy and inexpensive to manufacture.
  • the bottom of the lubrication pockets on an inclined surface additionally supports the construction of a hydrodynamic lubricating wedge.
  • the inclined surface is formed to the flattening of the cam ring or the sliding surface of the sliding block.
  • the structure of the hydrodynamic lubricating wedge is further advantageously influenced.
  • the lubrication pockets are dome-shaped or hemispherical in shape. Such training The lubrication pockets are particularly easy to produce.
  • the cross-sectional areas of the individual lubrication pockets are small with respect to the cross-sectional area of the entire flattening of the cam ring or the sliding surface of the slide shoe.
  • the cross-sectional area of the individual lubrication pockets is less than 1% of the cross-sectional area of the entire flattening of the cam ring or the sliding surface. This results in a sufficiently good lubricating wedge and for other a sufficiently large contact surface between the shoe and the cam ring. As a result, the wear of the components is minimized.
  • the lubricating pockets are produced by laser structuring or erosion. These methods allow easy insertion of the lubrication pockets.
  • the introduction can be integrated directly into the existing manufacturing process, whereby the production time and production costs can be kept low.
  • the lubricating pockets according to the invention are thus characterized in that they can be distributed uniformly over the entire cross section of the sliding surface of the sliding shoe or the flattening of the lifting ring and thereby promote the construction of a hydrodynamic locking wedge. Due to the small cross-sectional area of the lubrication pockets in relation to the total area of the sliding shoe or the flattening results in a large footprint between shoe and cam. As a result, the force is transmitted from the piston to the shoe uniformly passed to the cam. By lubricating pockets according to the invention thus the friction between the shoe and the lifting ring can be reduced to a minimum. This increases the life of the surfaces. In addition, the lateral forces are passed from the cam ring on the shoe into the piston, reduced, resulting in an increased life.
  • the radial piston pump 1 consists essentially of a pump housing 2 and a plurality of radially arranged pump units 9.
  • the pump units 9 are preferably arranged at an angular distance of 120 ° to each other.
  • the pump units 9 have a cylinder bore in which a pump piston 8 is movably arranged.
  • the pump piston 6 has at its lower end a sliding shoe 6 which is supported with a sliding surface 7 against a lifting ring 4.
  • the lifting ring 4 has one of the number of pumping pistons 8 corresponding number of flats 5.
  • the cam ring 4 is slidably disposed on an eccentric shaft portion of the drive shaft 3. At each full revolution of the drive shaft 3, the pump piston 8 performs a suction and a compression stroke.
  • FIG. 2a shows a side view of the lifting ring as in the radial piston pump after FIG. 1 is used.
  • the reciprocating piston has three each flattened by 120 ° flats 5.
  • the lubrication pockets 9 are arranged.
  • the lubrication pockets form small recesses in the flattening 5 and thus serve as an oil reservoir and thus ensure a good lubrication of the friction surfaces.
  • FIG. 2b shows a side view of an in FIG. 2a shown lubricating pocket 9.
  • the lubricating pocket 9 is formed hemispherical 14.
  • Such a hemispherical formation 14 can be very easily introduced into the surface.
  • a laser structuring method or an erosion method is preferably used. These processes can be integrated directly into the existing manufacturing process. Thus, only marginally longer production times occur.
  • Figure 2c shows a plan view of the in FIG. 2a shown cam ring 4.
  • the lubrication pockets 9 are distributed matrix-like. This distribution allows a particularly uniform formation of a lubricating wedge.
  • the lubrication pockets 9 can also be arranged at a different regular distance from each other. Also advantageous is a checkerboard-like arrangement of the lubrication pockets 9 or an arrangement on a circular path, which run concentrically with one another ( Fig. 5 ). Of course it is also possible To arrange lubrication pockets 9 at irregular intervals to each other.
  • Figure 3a and 3b show two different configurations of the bottom 12 of the lubrication pockets 9.
  • the in FIG. 4a shown embodiment of the bottom 12 with a constant depth h is particularly easy to produce.
  • the inclined surface 13, the in FIG. 3b extends to the flattening 5 of the cam ring 4, supports particularly advantageous the formation of a hydrodynamic lubricating wedge.
  • FIGS. 4a and 4b show two preferred cross-sectional areas of the lubricating pockets 9.
  • FIG. 4a shows an oval cross-sectional shape 10 in conjunction with the in FIG. 4a shown bottom 12 with constant depth h is particularly simple and inexpensive to produce.
  • triangular formation 11 of the cross-sectional area is particularly in combination with in FIG. 3b shown slope of the surface 13 suitable to form a hydrodynamic lubrication wedge.
  • lubrication pockets 9 are exemplary only, of course, other cross-sectional shapes or other configurations of the bottom of the lubrication pocket can be used.
  • the embodiments each show the formation of the lubrication pockets in the flats of the cam ring as well as it is possible to form the lubrication pockets in the sliding surface of the shoe. Again, the lubrication pockets ensure the formation of a hydrodynamic lubrication wedge.
  • the inventive design of lubrication pockets in the flats of the cam ring and or in the respective sliding surface of the shoe thus provide better lubrication between the contact surfaces and increase the life of the components considerably.
  • the better lubrication will be the Transverse forces transmitted from the cam ring via the slide ring in the pump piston are minimized.
  • the radial piston pump according to the invention is particularly suitable for use in modern common rail injection systems with the prevailing high pressures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Claims (9)

  1. Pompe à pistons radiaux (1), en particulier pompe à haute pression à pistons radiaux pour un système d'injection de carburant, comportant un arbre d'entraînement (3) monté dans un carter de pompe (2) et présentant une section d'arbre excentrique sur laquelle est monté à coulissement un anneau de levée (4) qui comprend à sa surface opposée à la section d'arbre excentrique, de préférence plusieurs méplats (5), sur chacun desquels s'appuie respectivement un patin (6) pourvu d'une surface de glissement (7) contre lequel est appliqué respectivement un piston de pompe (8) disposé radialement par rapport à l'arbre d'entraînement (3),
    des poches de lubrification (9) étant ménagées dans les méplats (5) de l'anneau de levée (4) et/ou dans la surface de glissement respective (7) du patin (6), ces poches de lubrification (9) étant disposées à des distances régulières les unes des autres,
    caractérisée en ce que les poches de lubrification (9) sont disposées en forme de matrice ou en damier.
  2. Pompe à pistons radiaux (1), en particulier pompe haute pression à pistons radiaux pour un système d'injection de carburant, comportant un arbre d'entraînement (3) monté dans un carter de pompe (2) et présentant une section d'arbre excentrique sur laquelle est monté à coulissement un anneau de levée (4) qui comprend à sa surface opposé à la section d'arbre excentrique, de préférence plusieurs méplats (5), sur chacun desquels s'appuie respectivement un patin (6) pourvu d'une surface de glissement (7) contre lequel est appliqué respectivement un piston de pompe (8) disposé radialement par rapport à l'arbre d'entraînement (3),
    des poches de lubrification (9) étant ménagées dans les méplats (5) de l'anneau de levée (4) et/ou dans la surface de glissement respective (7) du patin (6), ces poches de lubrification (9) étant disposées à des distances régulières les unes des autres,
    caractérisée en ce que les poches de lubrification (9) sont disposées sur des cercles (15) qui s'étendent de manière concentrique les uns par rapport aux autres.
  3. Pompe à pistons radiaux (1) selon l'une des revendications précédentes, caractérisée en ce que les poches de lubrification (9) présentent une section ovale (10) ou triangulaire (11).
  4. Pompe à pistons radiaux (1) selon l'une des revendications précédentes, caractérisée en ce que le fond (12) des poches de lubrification (9) présente une profondeur constante (h).
  5. Pompe à pistons radiaux (1) selon l'une des revendications 1 à 3, caractérisée en ce que le fond (12) des poches de lubrification (9) présente une surface inclinée (13).
  6. Pompe à pistons radiaux (1) selon la revendication 5, caractérisée en ce que la surface inclinée (13) s'étend jusqu'au méplat (5) de l'anneau de levée (4) ou de la surface de glissement (7) du patin (6).
  7. Pompe à pistons radiaux (1) selon l'une des revendications 1 ou 2, caractérisée en ce que les poches de lubrification (9) ont une forme en calotte ou sont hémisphériques (14).
  8. Pompe à pistons radiaux (1) selon l'une des revendications précédentes, caractérisée en ce que la surface de section (10, 11) de chacune des poches de lubrification (9) est petite par rapport à la surface de section de l'ensemble du méplat (5) de l'anneau de levée (4) ou de la surface de glissement (7) du patin (6), de préférence <1%.
  9. Pompe à pistons radiaux (1) selon l'une des revendications précédentes, caractérisée en ce que les poches de lubrification (9) sont usinées par structuration au laser ou par érosion.
EP04804728A 2004-04-14 2004-12-08 Pompe a pistons radiaux Not-in-force EP1738074B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410018163 DE102004018163A1 (de) 2004-04-14 2004-04-14 Radialkolbenpumpe
PCT/EP2004/053346 WO2005108788A1 (fr) 2004-04-14 2004-12-08 Pompe a pistons radiaux

Publications (2)

Publication Number Publication Date
EP1738074A1 EP1738074A1 (fr) 2007-01-03
EP1738074B1 true EP1738074B1 (fr) 2010-04-21

Family

ID=34959576

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04804728A Not-in-force EP1738074B1 (fr) 2004-04-14 2004-12-08 Pompe a pistons radiaux

Country Status (3)

Country Link
EP (1) EP1738074B1 (fr)
DE (2) DE102004018163A1 (fr)
WO (1) WO2005108788A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016106232B3 (de) * 2016-04-06 2017-08-31 L'orange Gmbh Radialkolbenpumpe, insbesondere für Kraftstoff, mit mehreren Speicherbohrungen im Gehäuse der Radialkolbenpumpe

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006010680A1 (de) * 2005-11-21 2007-05-24 Continental Teves Ag & Co. Ohg Radialkolbenpumpe
DE102005059031A1 (de) * 2005-12-10 2007-06-14 Schaeffler Kg Radialkolben-Hochdruckpumpe einer Einspritzanlage zum Einspritzen eines flüssigen Brennstoffs
DE102008001713A1 (de) * 2008-05-13 2009-11-19 Robert Bosch Gmbh Radialkolbenpumpe
DE102011003245A1 (de) * 2011-01-27 2012-08-02 Schaeffler Technologies Gmbh & Co. Kg Tassenstößel zur Beaufschlagung eines Pumpenkolbens einer Kraftstoffhochdruckpumpe
DE102011079781A1 (de) * 2011-07-26 2013-01-31 Continental Automotive Gmbh Welle und Hochdruckpumpe
DE102014211870A1 (de) * 2014-06-20 2015-12-24 Robert Bosch Gmbh Schrägscheibenmaschine
CN110671316A (zh) * 2019-10-28 2020-01-10 吉林大学 一种高耐磨高密封活塞

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
DE564479C (de) * 1928-12-25 1932-11-19 Metallgesellschaft Ag Hochdruckschmiervorrichtung fuer Gleitlager
GB983310A (en) * 1962-01-29 1965-02-17 Hans Thoma Improvements in or relating to swash plate or like pumps or motors
DE2750490A1 (de) * 1977-11-11 1979-05-17 Bosch Gmbh Robert Gleitschuh fuer hydrostatische kolbenmaschinen
US5577846A (en) * 1992-03-30 1996-11-26 Koyo Seiko, Co., Ltd. Eccentric rolling bearing device
DE19635164A1 (de) * 1996-08-30 1998-03-05 Bosch Gmbh Robert Kolbenpumpe
IT239879Y1 (it) * 1996-12-23 2001-03-13 Elasis Sistema Ricerca Fiat Perfezionamenti ad una pompa a pistoni, in particolare ad una pompa apistoni radiali per il carburante di un motore a combustione interna.
DE19814506A1 (de) * 1998-04-01 1999-10-14 Bosch Gmbh Robert Radialkolbenpumpe zur Kraftstoffhochdruckversorgung
DE19836901C2 (de) * 1998-08-14 2002-08-29 Bosch Gmbh Robert Radialkolbenpumpe
DE10039210A1 (de) * 2000-08-10 2002-02-28 Siemens Ag Radialkolbenpumpe mit zweiteiligem Federträger
DE10247645A1 (de) * 2002-10-11 2004-04-22 Robert Bosch Gmbh Radialkolbenpumpe zur Kraftstoffhochdruckversorgung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016106232B3 (de) * 2016-04-06 2017-08-31 L'orange Gmbh Radialkolbenpumpe, insbesondere für Kraftstoff, mit mehreren Speicherbohrungen im Gehäuse der Radialkolbenpumpe

Also Published As

Publication number Publication date
WO2005108788A1 (fr) 2005-11-17
DE102004018163A1 (de) 2005-11-10
DE502004011084D1 (de) 2010-06-02
EP1738074A1 (fr) 2007-01-03

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