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EP0083579A1 - Pompes a pistons radiaux - Google Patents

Pompes a pistons radiaux

Info

Publication number
EP0083579A1
EP0083579A1 EP19810900567 EP81900567A EP0083579A1 EP 0083579 A1 EP0083579 A1 EP 0083579A1 EP 19810900567 EP19810900567 EP 19810900567 EP 81900567 A EP81900567 A EP 81900567A EP 0083579 A1 EP0083579 A1 EP 0083579A1
Authority
EP
European Patent Office
Prior art keywords
pump
piston
slipper
eccentric
ball
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Withdrawn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
EP19810900567
Other languages
German (de)
English (en)
Inventor
Graham Evans
Ronald George Victor Goodall
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.)
Andrew Fraser & Co Ltd
Original Assignee
Andrew Fraser & Co 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 Andrew Fraser & Co Ltd filed Critical Andrew Fraser & Co Ltd
Publication of EP0083579A1 publication Critical patent/EP0083579A1/fr
Withdrawn legal-status Critical Current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 present invention relates to radial piston pumps.
  • Existing radial piston pumps often require a header tank on the supply side to fill the cylinders of the pump. They use springs to hold the pistons in engagement with the eccentric drive member and when these are positioned within the cylinder, this results in substantial un-swept volume and consequent low efficiency.
  • a radial piston pump comprising at least one bank of pistons each arranged to be held in engagement with an eccentric drive member principally by means of the input pressure generated by a booster pump, wherein each piston engages the eccentric member by way of a slipper which is mounted on the end of the piston by means of a pivot joint, a centering spring extends between each piston and its slipper to provide a restoring force against pivotting of the slipper about the said joint, and the slipper has a part-spherical surface mating with a part-spherical surface of the eccentric.
  • the pivot joint is a ball and socket joint with the ball held in position by a resilient ring in an oversize groove so that the joint can be assembled and disassembled by snap action.
  • the ball is preferably formed on the end of the piston and the socket in the slipper.
  • the slipper is preferably provided with a hydrostatic bearing pad for engagement with the eccentric and this pad can be supplied with liquid from the cylinder by way of a bore extending axially through the piston.
  • the centering spring can be accommodated in this bore and have resilient tongues extending into a recess in the slipper.
  • Fig. 1 is a longitudinal section of a radial piston pump in accordance with the invention
  • Fig. 2 is a plan view with part cut away to show the valves for one of the cylinders
  • Fig. 3 is a detail on an enlarged scale of one of the cylinders of the pump.
  • the pump shown in the drawings has a shaft 10 mounted in bearings 11 and 12 and formed with three eccentric drive members 13, 14 and 15. Each of the eccentrics drives a bank of four pistons 16 which are arranged at equal angular spacing around the shaft. Each piston 16 operates in a cylinder 17.
  • the shaft 10 also drives a boost pump 18 of the "Gerotor" type which conprises a lobed disc or gear 19 rotating in an eccentric housing 20 whose inner surface has complementary lobes and pumping between arcuate inlet and outlet slots 21 and 22.
  • the inlet slot 21 is connected with a supply tank and the boost pump 18 feeds liquid by way of a duct 23, an. annulus 24 and four supply ducts 25 to the cylinders 17.
  • a relief valve 26 controls the supply pressure from the boost pump 18 to the cylinders 17.
  • each cylinder 17 is controlled by a suction valve 27 while the cutlet is controlled by a discharge valve 28.
  • These valves are arranged on opposite sides of the cylinder and close to the cylinder head.
  • the piston 16 does not require biassing springs and thus at the top of its stroke can come close to the cylinder head to minimize the un-swept volume of liquid in the cylinder.
  • Fig. 3 it will be seen that each of the pistons 16 at its inner end has the form of a ball 29 which is received in a socket 30 of a slipper 31, through which the eccentric (here eccentric 13) drives the piston.
  • the ball 29 is held in the socket 30 by a spring ring 32 disposed in an oversize groove 33 which allows the ring 32 to expand when the ball is pressed into or pulled out of the socket.
  • the slipper 31 has a part spherical surface 34 engaging the correspondingly curved surface 35 of the eccentric 13.
  • a recess 36 in the surface 34 is supplied with liquid from the cylinder 17 by way of an axial bore 31 in the piston 16 in order to foxm a hydrostatic pad bearing. Liquid passing through the bore 37 also lubricates the mating surfaces of the ball 29 and socket 30 and any excess pressure can be relieved through bores 38 communicating with the groove 33.
  • each piston Mounted in the bore 37 of each piston is a finger spring 39, whose fingers 40 engage a recess in the back of the slipper 31 to hold the slipper axially aligned with the piston.
  • the spring 39 is formed of a strip of spring steel formed with the required fingers 40 and bent round into a tube which fits into a socket in the bore 37.
  • the interior of the pump casing is filled with the liquid, usually an oil, being pumped which provides lubrication for the bearings 11 and 12 and for the eccentrics 13, 14 and 15.
  • This liquid enters the casing through a duct 41 from the pressure relief valve 26 and passes through the bearings 11 and 12 before returning by way of an axial bore 42 in the shaft 10 and a check valve 43 to the inlet groove 21 of the boost pump 18.
  • the boost pump 18 is so designed and so connected with the inlets and outlets of the main pump cylinders that it will only boost the supply pressure when the shaft 10 is rotated in the correct sense. However the sense of rotation can be reversed if an end plate 44, which determines the eccentricity of the housing 20 of the boost pump 18, is turned through 180o about the axis of the shaft.

Landscapes

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

Abstract

Dans une unite possedant une pompe d'alimentation reliee dans l'alimentation aux cylindres (17) de maniere telle que le piston (17) soit maintenu en prise avec l'excentrique d'entrainement (13) par la pression d'alimentation, sans utiliser de ressorts, un patin (31) muni d'un coussinet hydrostatique (36) engage l'excentrique (13) et possede une douille (30) qui recoit une bille (29) fixee a l'extremite du piston. La bille (29) est maintenue en place par un segment elastique (32). Afin de reduire au minimum les defauts d'alignement du patin (31) par rapport a l'excentrique (13) lorsque la pompe n'est pas en fonctionnement, un ressort de centrage (39) muni de doigts (40) est dispose dans l'alesage (37) alimentant le coussinet (36). Afin d'eviter les chocs et l'endommagement resultant des defauts d'alignement, les surfaces d'accouplement (34 et 35) sont spheriques plutot que cylindriques.
EP19810900567 1981-03-16 1981-03-16 Pompes a pistons radiaux Withdrawn EP0083579A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB1981/000048 WO1982003253A1 (fr) 1981-03-16 1981-03-16 Pompes a pistons radiaux

Publications (1)

Publication Number Publication Date
EP0083579A1 true EP0083579A1 (fr) 1983-07-20

Family

ID=10518764

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810900567 Withdrawn EP0083579A1 (fr) 1981-03-16 1981-03-16 Pompes a pistons radiaux

Country Status (2)

Country Link
EP (1) EP0083579A1 (fr)
WO (1) WO1982003253A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100458150C (zh) * 2004-01-30 2009-02-04 罗伯特·博世有限公司 高压泵

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL66843C (fr) * 1938-12-21 1950-11-16
US2302864A (en) * 1942-01-16 1942-11-24 Hydraulic Controls Inc Pump
US2851952A (en) * 1957-06-27 1958-09-16 Lane Edwin Leonard Hydraulic pumps
GB928587A (en) * 1959-04-16 1963-06-12 Council Scient Ind Res Improvements in hydraulic pumps or motors
DE2118712A1 (de) * 1971-04-17 1972-11-16 Robert Bosch Gmbh, 7000 Stuttgart Kolben-Gleitschuh-Element für hydrostatische Kolbenmaschinen
US4018137A (en) * 1973-02-17 1977-04-19 Robert Bosch G.M.B.H. Piston machine construction
GB1436752A (en) * 1973-05-09 1976-05-26 Eickmann K Fluid handling devices having pistons and piston shoes
FR2296778A1 (fr) * 1975-01-03 1976-07-30 Rexroth Sigma Perfectionnements apportes aux machines a pistons radiaux, notamment aux moteurs ou pompes hydrauliques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8203253A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100458150C (zh) * 2004-01-30 2009-02-04 罗伯特·博世有限公司 高压泵

Also Published As

Publication number Publication date
WO1982003253A1 (fr) 1982-09-30

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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Designated state(s): AT CH DE FR GB LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19830711

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GOODALL, RONALD GEORGE VICTOR

Inventor name: EVANS, GRAHAM