EP1797320B1 - Pompe a pistons radiaux comprenant un poussoir a galet - Google Patents

Pompe a pistons radiaux comprenant un poussoir a galet Download PDF

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Publication number
EP1797320B1
EP1797320B1 EP05774194A EP05774194A EP1797320B1 EP 1797320 B1 EP1797320 B1 EP 1797320B1 EP 05774194 A EP05774194 A EP 05774194A EP 05774194 A EP05774194 A EP 05774194A EP 1797320 B1 EP1797320 B1 EP 1797320B1
Authority
EP
European Patent Office
Prior art keywords
pump
roller
radial piston
tappet
plunger
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 - Fee Related
Application number
EP05774194A
Other languages
German (de)
English (en)
Other versions
EP1797320A1 (fr
Inventor
Ngoc-Tam Vu
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 EP1797320A1 publication Critical patent/EP1797320A1/fr
Application granted granted Critical
Publication of EP1797320B1 publication Critical patent/EP1797320B1/fr
Expired - Fee Related 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
    • F04B1/0426—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
    • 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
    • F04B1/0439—Supporting or guiding means for the pistons

Definitions

  • the invention relates to a radial piston pump, with a pump housing and at least one pump unit comprising a pump piston and a cylinder insert in which the pump piston is mounted to move back and forth; wherein the pump unit is drivable via a camshaft mounted in the pump housing; and between the camshaft and the pump unit, a roller tappet is arranged.
  • a generic radial piston pump is already out of the EP 1 319 831 A2 known.
  • the radial piston pump has a camshaft which, via a roller tappet, moves a piston arranged in the pump housing or cylinder head.
  • the roller tappet is disposed between the camshaft and the pumping piston and includes a plunger and a roller which is arranged substantially and directly rotatable in the plunger.
  • the outer peripheral surface of the roller rolls on the outer peripheral surface of the camshaft. This results in a particularly low friction at the contact point between the roller and camshaft, whereby the wear of the components is minimized.
  • the radial piston pump according to the invention with a pump housing and at least one pump unit comprising a pump piston and a cylinder insert in which the pump piston is mounted reciprocally movable; wherein the pump unit is drivable via a camshaft mounted in the pump housing; and between the camshaft and the pump unit, a roller tappet comprising a plunger and a roller is arranged, characterized in that the plunger has a guide portion with which it is guided in a first slot-shaped guide groove of the cylinder insert.
  • the slot-shaped guide can be easily and inexpensively, for example, by milling in the cylinder insert bring.
  • the guide area on the plunger can be formed in the form of a simple flattening on.
  • the first slot-shaped guide groove is formed parallel to the longitudinal axis of the pump piston.
  • the parallel to the longitudinal axis of the Pump piston trained slot-shaped guide is manufacturing technology particularly easy to manufacture.
  • a particularly good and secure clamping guide of the plunger is ensured by the parallel design of the guide.
  • the parallel design of the guide groove ensures that the roller rests against the camshaft with its entire width. A misjudged and an associated unfavorable introduction of force is thus effectively prevented.
  • a further preferred embodiment of the invention provides that the roller of the roller tappet is guided in a second slot-shaped guide groove of the cylinder insert. This results in a particularly secure guidance of the roller tappet.
  • a particularly preferred embodiment of the invention provides that the second slot-shaped guide groove is arranged at right angles to the first slot-shaped guide groove. Due to the rectangular arrangement of the guide grooves to each other results in a simplified assembly of the roller tappet, since the roller tappet can thereby be used in two mutually offset by 180 degrees positions in the cylinder insert.
  • a return spring is arranged between the cylinder insert and the roller tappet. Due to the return spring, the roller tappet is constantly held in contact with the camshaft during pump operation. A lifting of the roller tappet from the camshaft is thereby avoided. A lifting and subsequent impact of the roller tappet on the camshaft would otherwise lead to significantly increased wear of the roller tappet and the camshaft.
  • contact surfaces for the return spring are preferably formed on the cylinder insert and on the roller tappet.
  • roller tappet comprises a disc which serves to receive the return spring.
  • the disc is designed such that it is guided with its inner circumference on the outer circumference of the cylinder insert. For this purpose, a small clearance exists between the disc and the cylinder insert.
  • a further preferred embodiment of the invention provides that the plunger has a fork-shaped receptacle, between which the roller of the roller tappet is rotatably supported by means of a roller bolt.
  • the fork-shaped receptacle allows a particularly simple attachment of the roller on the roller tappet.
  • the role can be easily connected to the ram via a roller bolt.
  • the roller bolt allows the rotatable arrangement of the roller in the ram.
  • a further preferred embodiment of the invention provides that the plunger is positively connected to the pump piston.
  • the positive connection ensures a particularly simple and secure connection between the plunger and the pump piston, even at high pressures and speeds.
  • a particularly preferred embodiment of the invention provides that the plunger has a T-slot, which forms the positive connection with a shoulder formed on the pump piston.
  • a T-slot is relatively simple form in the ram and advantageously ensures easy and safe installation.
  • the inventive radial piston pump is based on the idea of preventing the plunger from rotating along its longitudinal axis, in which a guide region is formed on the plunger with which it is guided in a first slot-shaped guide groove of the cylinder insert. As a result, a twisting of the plunger is first effectively prevented, whereby damage to the radial piston pump can be reduced. Due to the rotationally secure arrangement of the plunger, the radial piston pump is particularly suitable for high speeds, as they occur, for example, in high-pressure fuel pumps, for which the present invention is particularly suitable.
  • FIG. 1 shows a radial section through a radial piston pump.
  • the radial piston pump essentially consists of a cylinder insert 4 offset in the pump housing 1 and two at an angle of 90 degrees to one another.
  • Each cylinder insert 4 has a cylinder chamber 21 in which a respective pump piston 3 is arranged to be movable back and forth.
  • the pump piston 3 is driven by a camshaft 5 via a roller tappet 6.
  • the camshaft 5 may have one or more cams.
  • the roller tappet 6 comprises a tappet 7, a roller 8 and a roller pin 18.
  • the tappet has a fork-shaped receptacle 17 for receiving the roller 8.
  • the roller 8 is rotatably mounted between the fork shafts with the aid of a roller pin 18.
  • the plunger 7 has a guide portion 9, with which it is guided in a first slot-shaped guide groove 10 of the cylinder insert 4 (see also FIG. 3 and 4 ).
  • the first slot-shaped guide groove 10 is preferably formed parallel to the longitudinal axis of the pump piston 3. As a result, a secure guidance of the roller tappet 6 is ensured.
  • the guide groove 10 formed parallel to the longitudinal axis of the pump piston 3 can be introduced into the cylinder insert 4 in a simple manner, for example by milling.
  • the plunger 7 is particularly preferably connected positively to the pump piston 3.
  • the plunger 7 has a T-groove 19, which forms the positive connection with a shoulder 20 formed on the pump piston 3.
  • the positive connection ensures even at high speeds of the radial piston pump a secure connection between the roller tappet 6 and the pump piston 3.
  • results from the T-slot a particularly simple assembly of the two components.
  • a return spring 13 is arranged between the cylinder insert 4 and the roller tappet 6.
  • the roller tappet 6 and the cylinder insert 4 have for this purpose specially trained contact surfaces 14, 15.
  • the system on the roller tappet 6 is particularly preferably effected via a disk 16 resting against the tappet 7.
  • the disk 16 is designed in such a way that it is arranged on the outer circumference of the cylinder insert 4 with a slight play.
  • FIG. 2 The operation of the radial piston pump is off FIG. 2 seen. It is essentially similar to the function of conventional radial piston pumps with sliding shoe arrangement.
  • the fuel enters during the intake stroke of the pump piston 3 via a suction valve 22 in the cylinder chamber 21, leaves the cylinder chamber 21 following the compression via a high-pressure valve 23 and is supplied to a high-pressure accumulator, not shown.
  • FIG. 2 is particularly good the positive connection of the roller 8 with the plunger 7 can be seen.
  • the plunger 7 has for this purpose a fork-shaped receptacle 17.
  • the roller 8 is rotatably supported between the fork shafts of the receptacle 17 by means of a roller bolt 18.
  • each fork stem has a receiving bore. In this receiving bore of the roller pin 18 is fixed with a press fit, so that the components are arranged captive.
  • FIG. 3 shows a three-dimensional exploded view of the in FIG. 1 and 2 illustrated radial piston pump. Out This view is particularly good to recognize the leadership of the roller tappet 6 in the cylinder insert 4.
  • the plunger 7 has a guide region 9, with which it is guided in a first slot-shaped guide groove 10 of the cylinder insert 4. Because of this guide, a rotation of the plunger 7 is excluded about its longitudinal axis.
  • the slot-shaped guide groove 10 is formed parallel to the longitudinal axis of the pump piston 3.
  • the training parallel to the longitudinal axis has particular manufacturing advantages. Of course, however, another embodiment of the guide groove 10 is possible.
  • the roller 8 is guided in a second slot-shaped guide groove 12 of the cylinder insert 4. As a result, the security against rotation is further increased.
  • FIG. 4 shows the radial piston pump in three-dimensional representation in the assembled state. On the presentation of the pump housing was omitted in favor of a better clarity. In the figure, the leadership of the plunger 7 in the cylinder insert 4 is again particularly well shown. In particular, it can also be seen in the figure that the disc 16 for receiving the return spring 13 rests on a shoulder of the plunger 7 and is guided on the outer circumference of the cylinder insert 4.
  • the radial piston pump is preferably designed in a modular design.
  • the pump units 2 can essentially be pre-assembled as independent units before assembly of the radial piston pump.
  • the radial piston pump is particularly suitable for high speeds, as they occur for example in high-pressure fuel pumps, for which the present invention is particularly suitable.

Landscapes

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

Abstract

L'invention concerne une pompe à pistons radiaux qui comprend un corps de pompe (1) et au moins une unité de pompage (2) comprenant un piston (3) et un cylindre (4) dans lequel le piston (3) est monté de façon à pouvoir effectuer un mouvement alternatif. L'unité de pompage (2) peut être entraînée par un arbre à cames (5) monté dans le corps de pompe (1). Un poussoir à galet (6) comprenant un poussoir (7) et un galet (8) est disposé entre l'arbre à cames (5) et l'unité de pompage (2). Selon l'invention, le poussoir (7) présente une zone de guidage (9) par l'intermédiaire de laquelle il est guidé dans une première rainure de guidage (10) en forme de fente ménagée dans le cylindre (4), ce qui permet d'empêcher de manière sûre une rotation du poussoir à galet (6) à l'intérieur du cylindre (4). Ce type de pompe à pistons radiaux est adapté en particulier aux régimes élevés survenant avec les pompes à carburant haute pression.

Claims (10)

  1. Pompe à pistons radiaux, avec un boîtier de pompe (1) et au moins une unité de pompe (2) comprenant un piston de pompe (3) et un élément cylindrique (4) dans lequel le piston de pompe (3) est monté de manière à faire des allers et retours ; dans laquelle
    - l'unité de pompe (2) peut être entraînée par le biais d'un arbre à cames (5) monté dans le boîtier de pompe (1) ; et
    - entre l'arbre à cames (5) et l'unité de pompe (2), il est agencé un poussoir à galet (6), comprenant un poussoir (7) et un galet (8),
    caractérisée en ce que
    le poussoir (7) présente une zone de guidage (9), à l'aide de laquelle il est guidé dans une première rainure de guidage en forme de fente (10) de l'élément cylindrique (4).
  2. Pompe à pistons radiaux selon la revendication 1,
    caractérisée en ce que
    la première rainure de guidage en forme de fente (10) est réalisée parallèlement à l'axe longitudinal du piston de pompe (3).
  3. Pompe à pistons radiaux selon la revendication 1 ou 2,
    caractérisée en ce que
    le galet (8) est guidé dans une seconde rainure de guidage en forme de fente (12) de l'élément cylindrique (4).
  4. Pompe à pistons radiaux selon la revendication 3,
    caractérisée en ce que
    la seconde rainure de guidage en forme de fente (12) est agencée à angle droit par rapport à la première rainure de guidage en forme de fente (10).
  5. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    entre l'élément cylindrique (4) et le poussoir à galet (6), il est agencé un ressort de rappel (13).
  6. Pompe à pistons radiaux selon la revendication 5,
    caractérisée en ce que
    sur chacun de l'élément cylindrique (4) et du poussoir à galet (6), il est réalisé une surface d'appui (14, 15) pour le ressort de rappel (13).
  7. Pompe à pistons radiaux selon la revendication 5,
    caractérisée en ce que
    le poussoir à galet (6) comprend un disque (16) qui sert à recevoir le ressort de rappel (13).
  8. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le poussoir (7) présente un logement (17) en forme de fourche, dans lequel le galet (8) du poussoir à galet (6) est monté rotatif au moyen d'un axe de galet (18).
  9. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le poussoir (7) est raccordé par adaptation de forme au piston de pompe (3).
  10. Pompe à pistons radiaux selon la revendication 9,
    caractérisée en ce que
    le poussoir (7) présente une rainure en T (19) qui, avec un épaulement (20) réalisé sur le piston de pompe (3), forme le raccord par adaptation de forme.
EP05774194A 2004-10-06 2005-07-27 Pompe a pistons radiaux comprenant un poussoir a galet Expired - Fee Related EP1797320B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004048711A DE102004048711B4 (de) 2004-10-06 2004-10-06 Radialkolbenpumpe mit Rollenstößel
PCT/EP2005/053671 WO2006037673A1 (fr) 2004-10-06 2005-07-27 Pompe a pistons radiaux comprenant un poussoir a galet

Publications (2)

Publication Number Publication Date
EP1797320A1 EP1797320A1 (fr) 2007-06-20
EP1797320B1 true EP1797320B1 (fr) 2011-10-05

Family

ID=35004233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05774194A Expired - Fee Related EP1797320B1 (fr) 2004-10-06 2005-07-27 Pompe a pistons radiaux comprenant un poussoir a galet

Country Status (5)

Country Link
US (1) US7762176B2 (fr)
EP (1) EP1797320B1 (fr)
CN (1) CN100473827C (fr)
DE (1) DE102004048711B4 (fr)
WO (1) WO2006037673A1 (fr)

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DE102006057246B4 (de) * 2006-12-05 2015-11-26 Schaeffler Technologies AG & Co. KG Mechanischer Stößel insbesondere für eine Kraftstoffpumpe einer Brennkraftmaschine, mit umgebogenen Laschen zur Abstützung des Bolzens der Antriebsrolle
DE102007012705A1 (de) * 2007-03-16 2008-09-18 Robert Bosch Gmbh Hochdruckpumpe zur Förderung von Kraftstoff mit einem torsionsentkoppelten Druckfederelement in der Stößeleinrichtung
FR2946406B1 (fr) * 2009-06-05 2016-07-01 Skf Ab Dispositif de rouleau suiveur de came, notamment pour pompe d'injection de carburant.
CN102052275B (zh) * 2009-10-30 2012-10-10 北京普析通用仪器有限责任公司 并联液相色谱泵
US20110171045A1 (en) * 2010-01-14 2011-07-14 Briggs & Stratton Corporation Pressure washer pump
DE102010063363A1 (de) * 2010-12-17 2012-06-21 Robert Bosch Gmbh Hochdruckpumpe
DE102011002701A1 (de) * 2011-01-14 2012-07-19 Robert Bosch Gmbh Hochdruckpumpe
WO2013043868A1 (fr) 2011-09-21 2013-03-28 Medrad, Inc. Système et procédé de distribution multi-fluide continue
FR3026791B1 (fr) * 2014-10-03 2019-04-19 Poclain Hydraulics Industrie Mecanisme hydraulique muni de moyens de guidage en translation des pistons
RU2020107030A (ru) 2015-01-09 2020-02-25 БАЙЕР ХелсКер ЛЛСи Многофлюидная система доставки с многоразовым расходным комплектом и ее конструкционные особенности
DE102015210356A1 (de) 2015-06-05 2016-12-08 Robert Bosch Gmbh Verdrehsicherung für einen Kolben im Zylinder einer Kraftmaschine
DE102015218754B4 (de) * 2015-09-29 2018-08-30 Continental Automotive Gmbh Hochdruckpumpe
CN105257520B (zh) * 2015-09-29 2017-06-13 北京精密机电控制设备研究所 一种泵用高可靠排量分档机构
DE102016218909A1 (de) * 2016-09-29 2018-03-29 Robert Bosch Gmbh Rollenstößel für eine Kolbenpumpe, Kolbenpumpe
CN107725302B (zh) * 2017-10-13 2019-01-22 福州大学 凸轮式无级变量柱塞泵

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Also Published As

Publication number Publication date
DE102004048711A1 (de) 2006-04-13
EP1797320A1 (fr) 2007-06-20
CN100473827C (zh) 2009-04-01
WO2006037673A1 (fr) 2006-04-13
US7762176B2 (en) 2010-07-27
CN101035984A (zh) 2007-09-12
DE102004048711B4 (de) 2006-09-14
US20080034959A1 (en) 2008-02-14

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