Variable displacement pump having throttled control passages

Details Variable displacement pump having throttled control passages Variable displacement pump having throttled control passages

1995-12-28

1996-10-08

Thorpe, Timothy S.

Rotary expansible chamber devices

With changeable working chamber magnitude

Spring or fluid biased movable member

418 30, 417220, F04C 1504

Patent

active

055624324

ABSTRACT:
To restrain the swinging of a movable displaceable cam ring and a spool of a control valve and to suppress pulsation on the discharge side of a variable displacement pump. In the variable displacement pump, a variable metering orifice (40) is provided midway in discharge-side passages (24, 29, 43, 44, 45) extending from a pump chamber. A spool-type control valve (30) is operated with the fluid pressure on the upstream and downstream sides of the orifice to control the fluid pressure supplied to fluid-pressure chambers around the cam ring in accordance with the flow rate of the fluid discharged from the pump chamber. A single or multistage throttle portion including throttles (50, 51, 52) is provided in at least one of fluid passages (46, 47) for communicating the upstream side of the orifice to one chamber of the valve, and fluid passages (35, 19b) for communicating the one chamber to the first fluid-pressure chamber as the valve operates.

REFERENCES:
patent: 3784326 (1974-01-01), Lagana et al.

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