Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1997-03-27
1998-08-11
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
91446, F16D 3102
Patent
active
057911428
ABSTRACT:
An improved pressure-compensated hydraulic system for feeding hydraulic fluid to one or more hydraulic actuators. A remotely located, variable displacement pump provides an output pressure equal to a control input pressure plus a constant margin. A pressure compensation system requires that a load-dependent pressure be provided to the pump input through a load sense circuit. An isolator transmits the load-dependent pressure to the pump control input, while preventing fluid from leaving the load sense circuit and flowing to the remotely located pump. A valve section, which controls the fluid flow between the pump and actuator, has a pressure compensating valve with a piston and spool controlling a pressure differential across a main control valve orifice by moving within a bore in response to a pressure differential between a pump supply pressure and the load sense pressure. The piston and spool also separate to shut off fluid flow to the actuator when the back pressure from the load exceeds the pump supply pressure.
REFERENCES:
patent: 3685540 (1972-08-01), Wilke
patent: 3777773 (1973-12-01), Tolbert
patent: 4693272 (1987-09-01), Wilke
patent: 4798126 (1989-01-01), Budzich
patent: 4842019 (1989-06-01), Rousset et al.
patent: 5000001 (1991-03-01), Christensen et al.
patent: 5067389 (1991-11-01), St. Germain
patent: 5138837 (1992-08-01), Obertrifter et al.
patent: 5146747 (1992-09-01), Sugiyama et al.
patent: 5161373 (1992-11-01), Morikawa et al.
patent: 5211196 (1993-05-01), Schwelm
patent: 5305789 (1994-04-01), Rivolier
patent: 5333449 (1994-08-01), Takahashi et al.
patent: 5415199 (1995-05-01), Claudinon et al.
patent: 5579642 (1996-12-01), Wilke et al.
Layne Michael C.
Paik Michael J.
Pedersen Leif
Wilke Raud A.
HUSCO International Inc.
Karimi Bijan N.
Look Edward K.
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