EP0743450A1 - Pompe à pistons radiaux - Google Patents

Pompe à pistons radiaux Download PDF

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Publication number
EP0743450A1
EP0743450A1 EP96107532A EP96107532A EP0743450A1 EP 0743450 A1 EP0743450 A1 EP 0743450A1 EP 96107532 A EP96107532 A EP 96107532A EP 96107532 A EP96107532 A EP 96107532A EP 0743450 A1 EP0743450 A1 EP 0743450A1
Authority
EP
European Patent Office
Prior art keywords
piston
eccentric
radial
bore
piston pump
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.)
Withdrawn
Application number
EP96107532A
Other languages
German (de)
English (en)
Inventor
Ulrich Hilteman
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.)
Magna Powertrain Hueckeswagen GmbH
Original Assignee
LuK Automobiltechnik GmbH and Co KG
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 LuK Automobiltechnik GmbH and Co KG filed Critical LuK Automobiltechnik GmbH and Co KG
Publication of EP0743450A1 publication Critical patent/EP0743450A1/fr
Withdrawn legal-status Critical Current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
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • F04B1/0535—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders the piston-driving cams being provided with inlets and outlets
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics

Definitions

  • the invention relates to a radial piston pump with pistons guided in a bore in at least one piston ring and moved by an eccentric in the bore.
  • Radial piston pumps of the type mentioned here are known. They have at least one piston which is moved radially from an eccentric to its axis of rotation and which is supported in its end facing the axis of rotation on the eccentric surface or on a ring moved by the eccentric.
  • the ring can also be designed as a polygon ring.
  • the pistons are arranged in the piston ring accommodated in the housing of the radial piston pump in such a way that their center lines intersect at a point which lies on the axis of rotation of the eccentric.
  • a tilting moment which is dependent on the operating pressure, the eccentricity of the eccentric and the angular position, acts on the piston during the operation of the rotary piston pump.
  • a large contact surface of the piston in the bore receiving it is required, that is to say that the piston — viewed in the radial direction — must be relatively long and have a so-called long guide. This forces a relatively large diameter of the piston ring and thus the housing of the radial piston pump.
  • the arrangement of the pistons also exerts a torque on the eccentric or on the race or polygon ring arranged between the eccentric and the piston crown.
  • the race of the eccentric is excited to rotate, since considerable torques arise.
  • These also lead to heavy wear between the bottom of the piston facing the axis of rotation of the eccentric and the surface of the eccentric or the race or polygon ring which cooperates with the piston head.
  • the contact surface is therefore subject to heavy wear, so that the desired sealing effect between the piston crown and the contact surface diminishes.
  • An embodiment of the radial piston pump is preferred in which the central axis of the piston is offset parallel to the imaginary line.
  • an embodiment of the radial piston pump is preferred in which the central axis of the piston - seen in the direction of rotation of the eccentric - lags behind the imaginary radial line. This arrangement reduces the disadvantages of the known pump particularly effectively.
  • the invention is explained below with reference to the drawing.
  • the single figure shows a cross section through a piston ring of a radial piston pump.
  • the piston ring 1 shown in the sectional view is provided with a central bore 3 which receives the eccentric 5 of a drive shaft 7.
  • the drive shaft 7 can also be mounted centrally in the housing and cover relative to the piston ring 1.
  • the eccentric is surrounded by a race 9, the cylindrical outer surface 11 of which is provided with at least one, here with three flat surfaces 13. A recess 15 is made in each of these flat surfaces 13, which opens to the bore 3 and breaks through the flat surface 13.
  • Each flat surface 13 is assigned a hollow piston 17, the flat bottom of which rests on the flat surface 19.
  • the cylindrical wall 21 of the piston 17 extending from the base 19 lies with its outer surface on the inner surface of a bore 23 made in the piston ring 1. This breaks through both the inner surface facing the bore 3 25 of the piston ring 1 as well as its circumferential surface 27.
  • the opening of the bore 23 facing the circumferential surface 27 is closed by a suitable closure cover 29 which is firmly anchored in the base body of the piston ring 1.
  • an elastic spring element is supported, here a helical spring 31, which is under tension and presses the piston 17 against the flat surface 13 of the race 9.
  • the eccentric 5 rotates while the race 9 performs a wobble movement, the distance between the plane surfaces 13 and the axis of rotation 33 of the drive shaft changing.
  • the pistons 17 are pushed within the bores 23 to a greater or lesser extent in the direction of the peripheral surface 27 of the piston ring 1 against the force of the helical spring 31.
  • the volume enclosed between the closure cap 29 and the bottom 19 of the piston 17 and the wall of the bore 23 changes.
  • a fluid can be drawn in through a central inlet opening 35 in the base 19 via the recess 15 in the suction area formed by the bore 3.
  • the bottom 19 moves relative to the flat surface 13, so that the connection between the suction area and the interior enclosed by the piston 17 is temporarily interrupted.
  • the operation of such a radial piston pump is known, so that it will not be discussed further here.
  • the sectional view shows that the central axis 37 of the pistons 17 is offset from an imaginary line 39 which intersects the axis of rotation 33 of the eccentric 5 or the drive shaft 7.
  • the central axis 37 and the line 39 run parallel to one another at a distance s in the exemplary embodiment shown here.
  • the central axes 37 are set back or "lagging" with respect to the line 39.
  • the size of the distance s can be varied in a range from 0.1e to 1e, preferably 0.4e to 0.7e.
  • the distance s is in particular 0.6e.
  • e denotes the eccentricity.
  • the size of the tilting and torque depends not only on the pressure built up during operation of the radial piston pump in the interior between the closure cover 29 and piston 17 but also on the eccentricity e of the eccentric 5 and its angular position.
  • the offset of the central axis 37 with respect to the imaginary radial line 39 ensures that the tilting moment on the piston 17 and the torque acting on the race 9 are reduced.
  • the resulting torque acting on the race 9 can be influenced so that it changes its sign. Due to the design of the rotary piston pump shown in the figure, that is, the parallel offset of the pistons 17, the inclination of the race 9 can be significantly reduced. This significantly reduces the wear between the underside of the base 9 and the flat surface 13, so that an optimal sealing effect is maintained here.
  • the tilting moment acting on the piston is ultimately significantly reduced, so that on the one hand the wear between the piston surface and the bore 23 is reduced.
  • the pumps described here are very easy to manufacture, so that the mentioned offset can be implemented inexpensively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
EP96107532A 1995-05-18 1996-05-11 Pompe à pistons radiaux Withdrawn EP0743450A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19518198 1995-05-18
DE1995118198 DE19518198A1 (de) 1995-05-18 1995-05-18 Radialkolbenpumpe

Publications (1)

Publication Number Publication Date
EP0743450A1 true EP0743450A1 (fr) 1996-11-20

Family

ID=7762211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96107532A Withdrawn EP0743450A1 (fr) 1995-05-18 1996-05-11 Pompe à pistons radiaux

Country Status (3)

Country Link
EP (1) EP0743450A1 (fr)
JP (1) JPH094559A (fr)
DE (1) DE19518198A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998014704A1 (fr) * 1996-10-01 1998-04-09 Mannesmann Rexroth Ag Pompe a piston radial
WO2007141058A1 (fr) * 2006-06-06 2007-12-13 Continental Automotive Gmbh Pompe à fluide avec mécanisme d'embiellage
WO2009098095A1 (fr) * 2008-02-04 2009-08-13 Robert Bosch Gmbh Came sans effort transversal pour pompes haute pression à rampe commune
CN110685878A (zh) * 2019-11-11 2020-01-14 王守武 齿轮偏心轴多缸活塞泵结构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10027425A1 (de) * 2000-06-02 2001-12-06 Zf Batavia Llc Radialkolbenpumpe
JP2017025871A (ja) * 2015-07-27 2017-02-02 株式会社アドヴィックス ポンプ装置およびこれを備えた車両用ブレーキ装置
CN111779669A (zh) * 2020-08-04 2020-10-16 赣州市闻誉科技有限公司 一种用于低洼的自吸式抽水泵

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3921635A1 (de) * 1988-07-01 1990-01-04 Kayaba Industry Co Ltd Hydro-radialkolbenpumpe
DE3942223C1 (en) * 1989-12-21 1991-06-20 Asea Brown Boveri Ag, 6800 Mannheim, De Piston-cylinder for electrical switching drive unit - has piston driven against spring by eccentric to off set piston axis w.r.t. eccentric centre point
WO1992014056A1 (fr) * 1991-01-30 1992-08-20 Barmag Luk Automobiltechnik Gmbh & Co. Kg Pompe a pistons radiaux
EP0520286A2 (fr) * 1991-06-27 1992-12-30 LuK Automobiltechnik GmbH & Co. KG Pompe à pistons radiaux
DE4310062A1 (de) * 1993-03-27 1994-09-29 Teves Gmbh Alfred Radialkolbenmaschine
EP0687814A2 (fr) * 1994-05-25 1995-12-20 Sumitomo Electric Industries, Limited Pompe à plongeur

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3921635A1 (de) * 1988-07-01 1990-01-04 Kayaba Industry Co Ltd Hydro-radialkolbenpumpe
DE3942223C1 (en) * 1989-12-21 1991-06-20 Asea Brown Boveri Ag, 6800 Mannheim, De Piston-cylinder for electrical switching drive unit - has piston driven against spring by eccentric to off set piston axis w.r.t. eccentric centre point
WO1992014056A1 (fr) * 1991-01-30 1992-08-20 Barmag Luk Automobiltechnik Gmbh & Co. Kg Pompe a pistons radiaux
EP0520286A2 (fr) * 1991-06-27 1992-12-30 LuK Automobiltechnik GmbH & Co. KG Pompe à pistons radiaux
DE4310062A1 (de) * 1993-03-27 1994-09-29 Teves Gmbh Alfred Radialkolbenmaschine
EP0687814A2 (fr) * 1994-05-25 1995-12-20 Sumitomo Electric Industries, Limited Pompe à plongeur

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998014704A1 (fr) * 1996-10-01 1998-04-09 Mannesmann Rexroth Ag Pompe a piston radial
WO2007141058A1 (fr) * 2006-06-06 2007-12-13 Continental Automotive Gmbh Pompe à fluide avec mécanisme d'embiellage
WO2009098095A1 (fr) * 2008-02-04 2009-08-13 Robert Bosch Gmbh Came sans effort transversal pour pompes haute pression à rampe commune
CN110685878A (zh) * 2019-11-11 2020-01-14 王守武 齿轮偏心轴多缸活塞泵结构

Also Published As

Publication number Publication date
DE19518198A1 (de) 1996-11-21
JPH094559A (ja) 1997-01-07

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