EP 0608144 A3 19941221 - Axial piston pump.
Title (en)
Axial piston pump.
Title (de)
Axialkolbenpumpe.
Title (fr)
Pompe à pistons axiaux.
Publication
Application
Priority
GB 9301163 A 19930121
Abstract (en)
[origin: EP0608144A2] An axial piston pump comprises a drive shaft (2), a cylinder block (4) rotatable with the drive shaft (2), a plurality of pistons (6a-6i) provided within the cylinder block (4), a swashplate (12) situated at one axial end of the cylinder block (4) for causing reciprocation of the pistons (6a-6i) when the said cylinder block (4) is rotated, and a valve plate (26) situated at a second axial end of the cylinder block (4); wherein either one of the cylinder block (4) or valve plate (26) is urged against the other to form a hydrostatic seal between the cylinder block (4) and a face (52) of the said valve plate (26). The pump may be characterised by one or both of the following features:- A spiral groove bearing (50) is provided between the valve plate (26) and the cylinder block (4). The valve plate (26) is urged against the cylinder block (4) by means of a second piston (60) which has an arcuate load face. Additionally, an axial piston pump comprises a drive shaft (2), a cylinder block (4) rotatable with the drive shaft (2), a plurality of pistons (6a-6i) provided within the cylinder block (4), a swashplate (12) situated at one axial end of the cylinder block (4) for causing reciprocation of the pistons (6a-6i) when the cylinder block (4) is rotated; the said swashplate (12) being provided with a curved back, the curved back being seated within a curved recess in a swashplate cradle (14), a hydrostatic bearing (70, 72) being formed between the said curved back of the swashplate (12) and the curved recess of the swashplate cradle (14), and the said swashplate (12) being capable of swivelling within the said recess; wherein high pressure oil is supplied to the said hydrostatic bearing (70,72) via a passage provided in at least one of the said pistons and via a hole (80) provided in the body of the said swashplate (12). <IMAGE> <IMAGE> <IMAGE>
IPC 1-7
IPC 8 full level
F04B 1/20 (2006.01)
CPC (source: EP)
F04B 1/2007 (2013.01); F04B 1/2028 (2013.01); F04B 1/2085 (2013.01)
Citation (search report)
- [Y] DE 4125391 A1 19920206 - TOYODA AUTOMATIC LOOM WORKS [JP]
- [YA] DE 1653565 B1 19691204 - MASCHFAB EISENGIESSEREI BEIEN
- [A] DE 1528471 A1 19700129 - LELY NV C VAN DER
- [A] US 3487788 A 19700106 - THOMA JEAN, et al
- [A] US 4624175 A 19861125 - WAHLMARK GUNNAR A [US]
- [X] US 2241701 A 19410513 - DOE THOMAS B
- [X] EP 0175206 A1 19860326 - HITACHI LTD [JP]
- [X] US 3495542 A 19700217 - KRATZENBERG DIETRICH, et al
- [A] GB 1026343 A 19660420 - LUCAS INDUSTRIES LTD
- [XY] FR 2124739 A5 19720922 - BOSCH
- [X] EP 0241898 A2 19871021 - OILGEAR CO [US]
- [X] US 4903577 A 19900227 - LOFFLER THOMAS [DE]
- [YA] GB 2134188 A 19840808 - LINDE AG
- [Y] PATENT ABSTRACTS OF JAPAN vol. 10, no. 342 (M - 536)<2398> 19 November 1986 (1986-11-19)
Designated contracting state (EPC)
DE DK FR IT SE
DOCDB simple family (publication)
EP 0608144 A2 19940727; EP 0608144 A3 19941221; EP 0608144 B1 19970618; DE 69403819 D1 19970724; GB 2274491 A 19940727; GB 2274491 B 19960904; GB 9301163 D0 19930310
DOCDB simple family (application)
EP 94300461 A 19940121; DE 69403819 T 19940121; GB 9301163 A 19930121