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WO2006037676A1 - Pompe a piston radial et poussoir a galet - Google Patents

Pompe a piston radial et poussoir a galet Download PDF

Info

Publication number
WO2006037676A1
WO2006037676A1 PCT/EP2005/053721 EP2005053721W WO2006037676A1 WO 2006037676 A1 WO2006037676 A1 WO 2006037676A1 EP 2005053721 W EP2005053721 W EP 2005053721W WO 2006037676 A1 WO2006037676 A1 WO 2006037676A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
cup
tappet
roller
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.)
Ceased
Application number
PCT/EP2005/053721
Other languages
German (de)
English (en)
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO2006037676A1 publication Critical patent/WO2006037676A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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

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 reciprocably mounted; wherein the pump unit is drivable via a camshaft mounted in the pump housing; and wherein between the camshaft and the
  • a roller tappet is arranged, which comprises a push cup and a roller which is arranged substantially and directly in the push cup.
  • the radial piston pump has a camshaft that moves a pump piston arranged in the pump housing or cylinder head via a roller tappet.
  • the roller tappet is arranged between the camshaft and the pump piston and comprises a tappet cup and a roller which is arranged essentially and directly in the tappet cup in a rotatable manner.
  • the outer peripheral surface of the roller rolls on the outer peripheral surface of the camshaft.
  • a disadvantage of such a solution is that the role of the pusher cup is enclosed over a large area, resulting in a relatively large contact area in the area between the Stö ⁇ bezelbecher and the role.
  • increased friction occurs in the area of the contact surface and thus increased heat generation and increased wear of the components.
  • 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 piston is reciprocably mounted reciprocally; wherein the pump unit is drivable via a camshaft mounted in the pump housing; and wherein between the camshaft and the pump unit, a roller tappet is arranged, which comprises a push cup and a roller, which is arranged substantially and directly in the push cup; is characterized by the fact that at least one lubrication pocket is formed in the tappet cup, in the region of the contact surface which is arranged between the tappet cup and the roller.
  • a lubricant can be supplied to the area of the contact surface which is arranged between the tappet cup and the roller.
  • the friction in the contact region between the two components is minimized in an advantageous manner, thereby considerably increasing the service life of the components.
  • a preferred embodiment of the invention provides that the lubricating pocket can be supplied with lubricant via a lubricant feed formed in the push pot.
  • a lubricant supply is easy to introduce, for example in the form of a hole in the push cup. Due to the lubricant feed in the pusher cup, the lubrication are directed specifically to the formed in the push cup Schmier ⁇ pocket.
  • a further preferred embodiment of the invention provides that the push cup has at least one flattening parallel to its longitudinal axis.
  • flattening er ⁇ there is a simple vent.
  • the air can thereby advantageously escape during the upward movement of the Stumbleelbe ⁇ chers from the space between a cylinder insert and the push cup. Otherwise, this air would have to be compressed in each case, which would lead to a reduction in the efficiency and would significantly hinder the function of the radial piston pump.
  • a further preferred embodiment of the invention provides that the roller tappet has a safeguard against rotation of the tappet cup about its longitudinal axis.
  • the fuse ensures that the push cup together with the roller can not rotate in relation to the camshaft, which would otherwise lead to serious pump damage.
  • a particularly preferred embodiment of the invention provides that the fuse is a wedge which is arranged between the Pum ⁇ pengeophuse and the ram cup and which is supported against the flattening on the ram cup.
  • the Wedge is particularly easy to manufacture and easy to assemble.
  • the wedge is preferably designed so that the venting function is not hindered.
  • the wedge may, for example, be slightly concave on its inner side, so that a cavity results between the flattening of the tappet cup and the wedge, through which the air can escape during the upward movement of the roller tappet.
  • a return spring is arranged between the cylinder insert and the roller tappet.
  • the return spring advantageously ensures that the roller tappet and the pump piston fixedly connected to it is constantly in contact with the camshaft during pump operation.
  • a further preferred embodiment of the invention provides that the push cup is positively connected to the pump piston.
  • the interlocking connection ensures a permanent and secure connection between the Stumbleelbe ⁇ cher and the pump piston even at high pressures and Drehzah ⁇ len.
  • the push cup preferably has a T-groove, which forms a positive connection between the pump piston and the push cup with a shoulder formed on the pump piston.
  • a T-slot is relatively easy to form in the push cup and advantageously ensures a simple and secure connection and easy installation.
  • a particularly preferred embodiment of the invention provides that the positive connection of the tappet cup to the pump piston is achieved indirectly via a receiving unit connected to the tappet cup.
  • the T-slot can be introduced particularly easily in the receiving unit. After insertion of the T-groove then the receiving unit can be mounted in the push pot.
  • the invention is based on the idea of providing the contact surface with lubricant by forming a lubricating pocket in the region of a contact surface which is arranged between the tappet cup and the roller of a radial piston pump and thus reducing the friction between the components This results in a much longer lasting compared to the prior art training a Radialkol ⁇ benpumpe even at very high pressures or speeds, as they For example, occur in high-pressure fuel pumps, for which the present invention is particularly suitable.
  • FIG. 1 shows a radial section through a Radi ⁇ alkolbenpumpe invention
  • FIG. 2 shows an axial section through the radial piston pump shown in FIG. 1;
  • FIG. 3 shows a three-dimensional exploded view of the radial piston pump shown in FIGS. 1 and 2;
  • FIG. 4 shows a detailed view of the radial piston pump shown in FIGS. 1 to 3.
  • FIG. 1 shows a radial section through a radial piston pump.
  • the radial piston pump essentially consists of a pump housing 1 and two cylinder inserts 4 offset at an angle of 90 ° to each other.
  • Each cylinder insert 4 has a cylinder chamber 18 in which a 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 can have one or more cams 5a, 5b,...
  • the roller tappet 6 comprises a tappet cup 7 and a roller 8.
  • the roller 8 is arranged substantially and directly in the tappet cup 7. To accommodate the roller 8 in the tappet cup 7, the tappet cup has a cylindrical groove 26 complementary to the roller 8.
  • the groove 26 is designed such that it encloses the roller 8 so far that the roller 8 is guided captive and rotatable in the groove 26.
  • the jacket surface of the roller 8 rolls in pump operation against the circumferential surface of the camshaft 5 from. By rolling the roller 8 on the lateral surface of the camshaft 5, only slight frictional forces between the roller 8 and the camshaft 5 occur.
  • a return spring 15 is arranged between the cylinder insert 4 and the roller tappet 6.
  • the return spring 15 presses the roller tappet 6 constantly against the camshaft 5, whereby a permanent contact between the camshaft 5 and the roller tappet 6 is ensured.
  • the push pot 7 is positively connected via a receiving unit 24 to the pump piston 3.
  • the receiving unit 24 has a T-groove 16 which forms the positive connection with a shoulder 17 formed on the pump piston 3.
  • the receiving unit 24 is pressed against the plunger cup 7 via the return spring 15.
  • it can be secured in the tappet cup 7, for example, by press-fitting.
  • the push cup 7 is guided in a bore 19 of the pump housing 1. Due to the guidance of the tappet cup 7 in the pump housing 1, the tappet cup 7 can only perform a linear stroke movement. In this way, the conversion of the rotational movement of the camshaft 5 takes place in a linear movement of the tappet cup. 7
  • a lubricating pocket 10 is formed in the area of the contact surface 9.
  • the supply of lubricant to the lubrication pocket 10 via a formed in the ram cup 7 circumferential groove 20 and introduced into the tappet cup 7 lubricant feed 11.
  • the lubricant supply 11 is formed for example as a simple bore.
  • the operation of the radial piston pump is shown in FIG. 2. 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 over
  • the tappet cup 7 has two flattenings 12 lying opposite one another.
  • the Abfla ⁇ Chungen 12 are formed substantially parallel to the longitudinal axis of the tappet cup 7.
  • the parallel training has essentially manufacturing advantages; In principle, non-parallel flattenings are also conceivable.
  • the venting cross section 23 advantageously ensures that the air in the bore 19 in the upward movement of Stö ⁇ be belbechers 7 escape. Otherwise, the function of the radial piston pump would be severely limited because an air cushion would exist between the tappet cup 7 and the cylinder insert 4, which would have to be compressed with each upward movement of the tappet cup 7.
  • a wedge 13 is arranged between the pump housing 1 and the tappet cup 6.
  • the wedge 13 has substantially the shape of a hollow cylinder cut along its longitudinal axis.
  • the hollow cylindrical wedge 13 is arranged in the bore 19 such that it is supported against the flattening 12 of the tappet cup 7 on the one hand and against the bore 19 on the other hand with its outer circumferential surface. The wedge 13 thus prevents effective
  • FIG 2 can be seen particularly clearly see the connection between the roller tappet 6 and the pump piston 3.
  • the Verbin ⁇ tion is positively via a receiving unit 24 which is pressed by the return spring 13 against the ram cup 7.
  • the receiving unit 24 has a T-groove 16, which forms the positive connection with a shoulder 17 formed on the pump piston 3.
  • the receiving unit 24 can be fi xed by further measures on the tappet cup 7. For this purpose, it is possible, for example, to press the receiving unit 24 into the push pot.
  • FIG. 3 shows a three-dimensional exploded view of the radial piston pump shown in FIGS. 1 and 2.
  • the illustration clarifies in particular the spatial arrangement of the individual components.
  • the shape and position of the wedge 13 again clearly.
  • FIG 3 only one pump unit 2 is shown, wherein the second pump unit 2, not shown, is constructed identically.
  • the pump units 2 each consist of a roller tappet 6, comprising the tappet cup 7 and the tube 8, as well as the receiving unit 24 and the pump piston 3.
  • the pump unit 2 can preferably, be ⁇ before the assembly of the radial piston pump, ass ⁇ permanent assembly to be pre-assembled. As a result, the subsequent assembly of the entire radial piston pump substantially facilitated.
  • FIG. 4 shows a detailed view of the radial piston pump illustrated in FIGS. 1 to 3.
  • the detailed view shows the design of the lubricating pocket 10.
  • the formation of the lubricating pocket 10 takes place only in a small area around the lubricant feed 11, so that the contact surface 9 between the push bowl 7 and the roll 8 continues. as large as possible remains.
  • the lubricant is entrained during the rotation of the roller 8 and thereby distributes itself between the contact surface 9 in such a way that a hydrodynamic lubricant film is formed.
  • Hier ⁇ by the friction between the tappet cup 7 and the roller 8 is significantly reduced, which advantageously results in a significantly extended life of the components.

Landscapes

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

Abstract

La présente invention concerne une pompe à piston radial comprenant un boîtier de pompe (1) et au moins une unité de pompe (2), comprenant un piston de pompe (3) et un cylindre d'insertion (4) dans lequel le piston de pompe (3) est monté pour pouvoir effectuer un mouvement alternatif, l'unité de pompe pouvant être entraînée par un arbre à cames (5) monté dans le boîtier de pompe (1), et un poussoir à galet (6) étant disposé entre l'arbre à cames (5) et l'unité de pompe (2) et comprenant un boîtier de poussoir (7) et un galet (8) qui est disposé sensiblement directement dans le boîtier de poussoir (7). Selon l'invention, dans le boîtier de poussoir (7), au niveau d'une surface de contact (9) qui se trouve entre le boîtier de poussoir (7) et le galet (8), est formée au moins une poche de lubrification (10). On obtient ainsi un entraînement de la pompe à piston radial, particulièrement peu sujet aux frottements et à l'usure. La pompe à piston radial de l'invention convient en particulier aux pressions élevées et aux vitesses de rotation élevées auxquelles sont exposées les pompes à carburant haute pression.
PCT/EP2005/053721 2004-10-06 2005-07-29 Pompe a piston radial et poussoir a galet Ceased WO2006037676A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004048713.8 2004-10-06
DE102004048713 2004-10-06

Publications (1)

Publication Number Publication Date
WO2006037676A1 true WO2006037676A1 (fr) 2006-04-13

Family

ID=35159828

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/053721 Ceased WO2006037676A1 (fr) 2004-10-06 2005-07-29 Pompe a piston radial et poussoir a galet

Country Status (1)

Country Link
WO (1) WO2006037676A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20101594A1 (it) * 2010-09-01 2012-03-02 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna e relativo metodo di assemblaggio
WO2012048961A1 (fr) * 2010-10-15 2012-04-19 Robert Bosch Gmbh Pompe haute pression pour un dispositif d'injection de carburant
EP2711546A1 (fr) * 2012-09-24 2014-03-26 Continental Automotive GmbH Agencement de poussoir et pompe
DE102012222217A1 (de) 2012-12-04 2014-06-05 Continental Automotive Gmbh Rollenstößel
US20220010870A1 (en) * 2019-02-12 2022-01-13 Cummins Inc. Integrated tappet assembly
US20230066007A1 (en) * 2020-02-19 2023-03-02 Schaeffler Technologies AG & Co. KG Tappet for acting on a pump piston of a high-pressure fuel pump

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1526700A1 (de) * 1966-11-25 1970-02-26 Kloeckner Humboldt Deutz Ag Rollenstoessel fuer Einspritzpumpen an Brennkraftmaschinen
US3858487A (en) * 1968-02-05 1975-01-07 Hitachi Ltd Radial piston type hydraulic pump or motor
DE4421535A1 (de) * 1994-06-20 1995-12-21 Schaeffler Waelzlager Kg Rollenstößel mit einer Käfighalterung
DE19907311A1 (de) * 1999-02-22 2000-08-31 Bosch Gmbh Robert Hydraulikpumpeneinheit
DE10115168C1 (de) * 2001-03-27 2002-08-22 Orange Gmbh Kraftstoff-Hochdruckpumpe, insbesondere für Einspritzsysteme von Brennkraftmaschinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1526700A1 (de) * 1966-11-25 1970-02-26 Kloeckner Humboldt Deutz Ag Rollenstoessel fuer Einspritzpumpen an Brennkraftmaschinen
US3858487A (en) * 1968-02-05 1975-01-07 Hitachi Ltd Radial piston type hydraulic pump or motor
DE4421535A1 (de) * 1994-06-20 1995-12-21 Schaeffler Waelzlager Kg Rollenstößel mit einer Käfighalterung
DE19907311A1 (de) * 1999-02-22 2000-08-31 Bosch Gmbh Robert Hydraulikpumpeneinheit
DE10115168C1 (de) * 2001-03-27 2002-08-22 Orange Gmbh Kraftstoff-Hochdruckpumpe, insbesondere für Einspritzsysteme von Brennkraftmaschinen

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20101594A1 (it) * 2010-09-01 2012-03-02 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna e relativo metodo di assemblaggio
WO2012028507A1 (fr) * 2010-09-01 2012-03-08 Robert Bosch Gmbh Unité de pompe destinée à l'alimentation en carburant, de préférence du carburant diesel, à un moteur à combustion interne et procédé d'assemblage associé
CN103080530A (zh) * 2010-09-01 2013-05-01 罗伯特·博世有限公司 将优选为柴油燃料的燃料供应给内燃机的泵单元及其相关装配方法
CN103080530B (zh) * 2010-09-01 2016-01-13 罗伯特·博世有限公司 将优选为柴油燃料的燃料供应给内燃机的泵单元及其相关装配方法
WO2012048961A1 (fr) * 2010-10-15 2012-04-19 Robert Bosch Gmbh Pompe haute pression pour un dispositif d'injection de carburant
CN103154512A (zh) * 2010-10-15 2013-06-12 罗伯特·博世有限公司 用于燃料喷射装置的高压泵
EP2711546A1 (fr) * 2012-09-24 2014-03-26 Continental Automotive GmbH Agencement de poussoir et pompe
DE102012222217A1 (de) 2012-12-04 2014-06-05 Continental Automotive Gmbh Rollenstößel
WO2014086698A1 (fr) 2012-12-04 2014-06-12 Continental Automotive Gmbh Poussoir à galet
US20220010870A1 (en) * 2019-02-12 2022-01-13 Cummins Inc. Integrated tappet assembly
US20230066007A1 (en) * 2020-02-19 2023-03-02 Schaeffler Technologies AG & Co. KG Tappet for acting on a pump piston of a high-pressure fuel pump
US11913415B2 (en) * 2020-02-19 2024-02-27 Schaeffler Technologies AG & Co. KG Tappet for acting on a pump piston of a high-pressure fuel pump

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