EP 0288481 B1 19891220 - RADIAL PISTON PUMP
Title (en)
RADIAL PISTON PUMP
Publication
Application
Priority
EP 8600123 W 19860307
Abstract (en)
[origin: WO8705366A1] In the radial piston pump, a pressure limiter (20) is arranged coaxially with the driving shaft (4). A spring (21) arranged on the limiter load side bears on a sleeve (32) through a washer (31), the latter being provided with a choking port (33). When the pressure limiter is in operation in response to a start-up in cold conditions, the oil is rapidly heated when passing through the choking port and becomes more fluid. Consequently, there is no excess of dynamic pressure in a return chamber (24) which would otherwise cause a sudden displacement of the shaft (4), thus producing hammer blows. Furthermore, the choking port (33) generates an oil jet directed towards an axial bore (26) of the shaft (4). Thus, during the critical start-up phase, the bearings (29, 30) receive warmer oil throught the radial bores (27, 28) opening into the radial bore (26).
IPC 1-7
IPC 8 full level
F04B 1/04 (2006.01); F04B 1/053 (2006.01); F04B 23/02 (2006.01)
CPC (source: EP US)
F04B 1/0404 (2013.01 - EP US); F04B 1/0465 (2013.01 - EP US); F04B 1/053 (2013.01 - EP US); F04B 23/026 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 8705366 A1 19870911; BR 8707630 A 19890314; DE 3706028 A1 19870910; EP 0288481 A1 19881102; EP 0288481 B1 19891220; US 4881877 A 19891121
DOCDB simple family (application)
EP 8700109 W 19870225; BR 8707630 A 19870225; DE 3706028 A 19870225; EP 87901462 A 19870225; US 18648088 A 19880506