EP0210786B1 - Improvements relating to variable delivery pumps - Google Patents

Improvements relating to variable delivery pumps Download PDF

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Publication number
EP0210786B1
EP0210786B1 EP86305463A EP86305463A EP0210786B1 EP 0210786 B1 EP0210786 B1 EP 0210786B1 EP 86305463 A EP86305463 A EP 86305463A EP 86305463 A EP86305463 A EP 86305463A EP 0210786 B1 EP0210786 B1 EP 0210786B1
Authority
EP
European Patent Office
Prior art keywords
cam ring
pump
pivot
chambers
outer casing
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
EP86305463A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0210786A1 (en
Inventor
Ian Trevor Bristow
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.)
CAMBIO RAGIONE SOCIALE;HOBOURN TECHNOLOGY LIMITED
Original Assignee
HOBOURN ENGINEERING Ltd
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 HOBOURN ENGINEERING Ltd filed Critical HOBOURN ENGINEERING Ltd
Publication of EP0210786A1 publication Critical patent/EP0210786A1/en
Application granted granted Critical
Publication of EP0210786B1 publication Critical patent/EP0210786B1/en
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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • F04C14/226—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam by pivoting the cam around an eccentric axis

Definitions

  • variable delivery pumps and is more particularly concerned with a variable delivery pump such as is described in US-A-3656869, comprising an outer casing, a cam ring mounted for pivotal movement within the outer casing, and a rotor mounted within the cam ring for rotation about a fixed axis and having in its periphery angularly spaced radial slots in which respective piston elements are mounted for radial movement, said piston elements sweeping the internal surface of the cam ring as the rotor rotates, thereby to pump a fluid from an inlet port to an outlet port, the position of the cam ring about its pivot mounting being adjustable to vary the extent of radial movement of the piston elements and the delivery of the pump, and two seals disposed at the opposite side of the cam ring from the pivot and at opposite sides of the cam ring to each other, the pivot and the two seals serving to divide the space between the cam ring and the outer casing into three chambers whereby fluid pressures can be applied in the chambers at opposite sides of the pivot for producing
  • each of said seals comprises an unyielding sealing abutment arrangements including an arcuate sealing surface centred on said pivot, and means is provided for applying in the two chambers at opposite sides of the pivot fluid pressures which produce on the cam ring a resultant control force which acts in opposition to the spring means and urges the sealing abutments between the cam ring and the outer casing into tighter engagement.
  • said resultant control force is in excess of the force exerted by the delivery pressure acting internally of the cam ring and urging the cam ring in the opposite direction to said resultant control force.
  • said abutments also serve in conjunction with co-operating surfaces in the pump to limit the range of movement of the ring in each direction about said pivot.
  • said abutments comprise part-cylindrical abutment surfaces on the casing and complementary arcuate external surfaces centred on the pivot are provided on the ring and have each at one end a portion adapted to come into abutment with the complementary part-cylindrical abutment thereby to limit said range of movement.
  • the pump is variable-delivery positive-displacement pump and comprises two end members 10, 11 providing respectively plain and roller bearings 12, 13 for a drive shaft 14 on to which is keyed a rotor 15 having radial slots 16 in its periphery. Rollers 17 are disposed in the slots and serve in rotation of the rotor to pump liquid from an inlet port 18 to an outlet port 19. These ports are kidney-shaped in the usual manner and are formed in the end member 10.
  • the outlet port leads to a delivery passage 20 (see Figure 3) and a restricting orifice 21 is provided in the delivery passage the purpose of which will be explained presently.
  • the rollers 16 engage a cam surface formed internally of a cam ring 24 which is surrounded by the fixed casing part 25 clamped between the two end members 10, 11.
  • the cam ring has an external semi-cylindrical projection 27 which rests in a complementary recess in the casing part 25 to form a pivot about which the ring can move, sliding relative to the adjoining faces of the two end members 10, 11.
  • Two bearing rollers 28 forming abutments are disposed in respective recesses in the casing part at opposite sides of the cam ring to each other with respect to a first line containing the axis of pivot 27 and the general centre of the profile of the cam, and at the opposite side to the pivot 27 of a second line at right angles to the first line and containing the general centre of the profile of the cam.
  • Arcuate surfaces 29 centred on the pivot axis are formed on the ring to engage the rollers 28. At their ends nearer each other the arcuate surfaces have out- turned portions 30 which serve as stops to limit the pivotal movement of the cam ring 24 in each direction.
  • rollers 28 are located in pockets in the outer surface of cam ring 24 and the co-operating arcuate surfaces and stops are formed on the casing part 25.
  • a compression spring 32 disposed in a recess in the casing part acts against the ring, urging it into its position of maximum delivery by the pump, and the delivery of the pump can be controlled by means of a threaded plug 33 against which the spring is seated.
  • the abutments 28 and the pivot 27 define three chambers 34, 35, 36 between the ring and the casing part.
  • the chamber 36 remote from the pivot is in permanently-open communication with the inlet passage of the pump so as to be vented.
  • the chamber 34 remote from the spring 32 is in communication with the outlet port 19 and the, chamber 35 nearer the spring is in communication with the delivery passage 20 at the downstream side of the restricting orifice 21 by way of interconnecting passages 37, 38 and 39 leading to the recess for spring 32, see Figure 3.
  • the pressures in the chambers 34, 35 also act jointly in opposition to the force applied by the pressure of the pumped liquid on the internal surface of the cam ring 24 over the peripheral extent defined between the two rollers 17 which are instantaneously nearest to but beyond, opposite ends of the outlet port 19. Since the pressures in the two chambers 34, 35 jointly act on a larger area than that acted on by the delivery pressure internally of the ring, the resulting differential force can be, and is, arranged by appropriate selection of the positions of the two abutments 28, i.e. their distance apart, to press the ring into close engagement with the abutments 28.
  • a relief valve (not shown) may be provided communicating with the chamber 35 and a further restrictor (not shown) may be provided in one of the passages 37, 38, 39 between the chamber 35 and the downstream side of the restrictor orifice 21.
  • a further restrictor (not shown) may be provided in one of the passages 37, 38, 39 between the chamber 35 and the downstream side of the restrictor orifice 21.
  • the pressure drop across the restrictor orifice is quite small and there is no flow into or out of the chamber 35 but if the relief valve opens then the pressure drop in the chamber 35 becomes significant and causes the cam ring 24 to move against the spring 32 into its central or minimum delivery position, and the further restriction serves to allow the cam ring to move rapidly to respond to the opening of the relief valve and to damp the flow of fluid which would tend to restore the cam ring to its former position, while the relief valve remains open.
  • a device as described in our European Patent Specification No. 171183 may be provided acting on the cam ring to apply to the movement of the ring a damping force which varies in dependence on the instantaneous position of the cam ring.
  • the cam face of the cam ring is preferably shaped as described in our European Patent Specification No. 171182.
  • the restrictor orifice 21 may be omitted and the pressure differential in the chambers 34, 35 may be obtained by an alternative means, for example from the response of some apparatus externally of the pump.
  • the coil spring 32 may if desired be replaced by a leaf spring. It will be understood that the abutment rollers 28 may be replaced by simple abutment surfaces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP86305463A 1985-07-23 1986-07-16 Improvements relating to variable delivery pumps Expired - Lifetime EP0210786B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8518558 1985-07-23
GB858518558A GB8518558D0 (en) 1985-07-23 1985-07-23 Variable delivery pumps

Publications (2)

Publication Number Publication Date
EP0210786A1 EP0210786A1 (en) 1987-02-04
EP0210786B1 true EP0210786B1 (en) 1990-05-09

Family

ID=10582707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86305463A Expired - Lifetime EP0210786B1 (en) 1985-07-23 1986-07-16 Improvements relating to variable delivery pumps

Country Status (5)

Country Link
EP (1) EP0210786B1 (ja)
JP (1) JP2678439B2 (ja)
KR (1) KR950008015B1 (ja)
DE (1) DE3671071D1 (ja)
GB (1) GB8518558D0 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9109597B2 (en) 2013-01-15 2015-08-18 Stackpole International Engineered Products Ltd Variable displacement pump with multiple pressure chambers where a circumferential extent of a first portion of a first chamber is greater than a second portion

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02277578A (ja) * 1989-04-19 1990-11-14 Toray Eng Co Ltd 中空基体の浸漬塗布方法
US6375435B2 (en) 1999-02-17 2002-04-23 Coltec Industries Inc Static cam seal for variable displacement vane pump
EP1163449B1 (en) * 1999-12-22 2009-09-09 Goodrich Pump & Engine Control Systems, Inc. Variable displacement vane pump
US7108493B2 (en) 2002-03-27 2006-09-19 Argo-Tech Corporation Variable displacement pump having rotating cam ring
KR20030080605A (ko) * 2002-04-09 2003-10-17 김순진 기어펌프의 하우징 구조
GB2406140A (en) * 2003-09-22 2005-03-23 Dana Automotive Ltd Roller vane pump whose displacement depends on outlet pressure
GB0322122D0 (en) * 2003-09-22 2003-10-22 Dana Automotive Ltd Pumping system
DE102004002076B4 (de) * 2004-01-15 2010-02-04 Zf Lenksysteme Gmbh Flügelzellenpumpe
US9181803B2 (en) 2004-12-22 2015-11-10 Magna Powertrain Inc. Vane pump with multiple control chambers
TR201819627T4 (tr) * 2004-12-22 2019-01-21 Magna Powertrain Usa Inc Değişken kapasiteli pompayı çalıştırmaya yönelik yöntem.
CN104033329B (zh) * 2013-03-06 2017-04-19 宁波高新协力机电液有限公司 径向滚柱高速变量油马达
DE202014106121U1 (de) * 2014-12-17 2015-01-15 Schwäbische Hüttenwerke Automotive GmbH Rotationspumpe mit kompakter Stellstruktur zur Verstellung des Fördervolumens

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656869A (en) * 1970-04-02 1972-04-18 Ford Motor Co Variable displacement hydraulic pump
FR2195271A1 (ja) * 1972-08-04 1974-03-01 Peugeot & Renault
JPS5163004A (ja) * 1974-11-30 1976-06-01 Kubota Ltd
JPS58107884A (ja) * 1981-12-22 1983-06-27 Toyoda Mach Works Ltd 電磁制御式可変容量形ベ−ンポンプ
JPS5958185A (ja) * 1982-09-28 1984-04-03 Nachi Fujikoshi Corp 可変吐出量ベ−ンポンプ
JPS5963387A (ja) * 1982-10-01 1984-04-11 Toyoda Mach Works Ltd 可変容量形ポンプ
DE3247885C2 (de) * 1982-12-23 1986-12-18 Mannesmann Rexroth GmbH, 8770 Lohr Flügelzellen- oder Radialkolbenpumpe
JPS6090577U (ja) * 1983-11-28 1985-06-21 豊田工機株式会社 可変容量形ベ−ンポンプ
GB8417148D0 (en) * 1984-07-05 1984-08-08 Hobourn Eaton Ltd Variable capacity roller-and vane-type pumps

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9109597B2 (en) 2013-01-15 2015-08-18 Stackpole International Engineered Products Ltd Variable displacement pump with multiple pressure chambers where a circumferential extent of a first portion of a first chamber is greater than a second portion

Also Published As

Publication number Publication date
DE3671071D1 (de) 1990-06-13
KR950008015B1 (ko) 1995-07-24
JPS6316183A (ja) 1988-01-23
GB8518558D0 (en) 1985-08-29
KR870001408A (ko) 1987-03-13
EP0210786A1 (en) 1987-02-04
JP2678439B2 (ja) 1997-11-17

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