Load sensing pump control for a variable displacement pump

Details Load sensing pump control for a variable displacement pump Load sensing pump control for a variable displacement pump

1996-11-20

1999-03-02

Freay, Charles G.

Pumps

Condition responsive control of drive transmission or pump...

Having condition responsive pumped fluid control

417212, 60452, F04B 4908

Patent

active

058761853

ABSTRACT:
A variable displacement pump has a discharge passage and a displacement controller disposed to decrease pump displacement in response to an increasing pressure signal and to increase pump displacement in response to a decreasing pressure signal. A load sensing pump control for the pump includes a displacement control valve having an input port connected to the discharge passage and a signal port connected to the displacement controller. A valve spool controls communication between the input and signal ports and is biased in a direction to block the inlet port from the signal port by a spring. The spool has a differential area for exerting a force against the spool in opposition to the spring force proportional to the pump discharge pressure entering the valve through the input port. A variable force can be selectively exerted against the spool in opposition to the spring force to change the displacement of the pump.

REFERENCES:
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patent: 4203712 (1980-05-01), Uchara
patent: 4292805 (1981-10-01), Acheson
patent: 4527958 (1985-07-01), Borman
patent: 4553904 (1985-11-01), Ruseff et al.
patent: 4695230 (1987-09-01), Taplin
patent: 4699571 (1987-10-01), Bartholomaus
patent: 5051631 (1991-09-01), Anderson
patent: 5129229 (1992-07-01), Nakamura et al.
Appln. No. 08/621,924, Filed Mar. 26, 1996, "Electrohydraulic Pressure Regulating Valve", Marcott, Docket No. 94-203.

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