EP 0617758 B1 19950816 - INITIAL PRESSURE GOVERNOR FOR A VARIABLE DISPLACEMENT PUMP.
Title (en)
INITIAL PRESSURE GOVERNOR FOR A VARIABLE DISPLACEMENT PUMP.
Title (de)
EINRICHTUNG ZUR REGELUNG DES AUSGANGSDRUCKES EINER VERSTELLPUMPE.
Title (fr)
REGULATEUR DE LA PRESSION INITIALE D'UNE POMPE A CYLINDREE VARIABLE.
Publication
Application
Priority
- DE 4141108 A 19911213
- EP 9202880 W 19921212
Abstract (en)
[origin: WO9312342A1] An initial pressure governor for a main pump (11) designed as a variable displacement pump of a compression unit (10) that supplies a hydraulic consumer (54) has a pump capacity regulator (12) controllable by means of a regulating cylinder (13) driven by alternatively applying and reducing a pressure in a driving chamber (18). A pressure regulating valve (21) for applying and discharging the pressure is driven by the initial pressure of the pump and above a minimum pressure determined by a restoring spring delivers an initial pressure that increases with a control pressure coupled into its control chamber (27). The restoring spring (32) of the pressure regulating valve (21) is set at a restoring force that corresponds only to a small fraction of the maximum control force that can be generated by the control pressure. The pressure regulating valve (21) is provided with an additional control chamber (31) which, when a pressure is applied thereon, is capable of generating an additional restoring force whose maximum value corresponds at least approximately to that of the control force. The pressure coupled into the restoring chamber (31) is derived from the initial pressure of the main pump by means of a hydraulic retarder (36, 34).
IPC 1-7
IPC 8 full level
F04B 49/00 (2006.01); F04B 49/08 (2006.01)
CPC (source: EP US)
F04B 49/08 (2013.01 - EP US)
Designated contracting state (EPC)
AT DE ES FR GB IT NL
DOCDB simple family (publication)
WO 9312342 A1 19930624; AT E126568 T1 19950915; DE 4141108 A1 19930617; DE 59203317 D1 19950921; EP 0617758 A1 19941005; EP 0617758 B1 19950816; ES 2077476 T3 19951116; JP H07504246 A 19950511; US 5586869 A 19961224
DOCDB simple family (application)
EP 9202880 W 19921212; AT 93900035 T 19921212; DE 4141108 A 19911213; DE 59203317 T 19921212; EP 93900035 A 19921212; ES 93900035 T 19921212; JP 51061792 A 19921212; US 24491794 A 19940610