Variable displacement pump

Details Variable displacement pump Variable displacement pump

2006-10-31

2006-10-31

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

With changeable working chamber magnitude

Spring or fluid biased movable member

C418S027000, C418S030000, C417S220000

Reexamination Certificate

active

07128542

ABSTRACT:
In a hydraulic pump, a cam ring is provided in a cylindrical adaptor for movement in a radial direction, and a differential pressure control valve is provided to control internal pressure and load pressure at the front and back sides of a variable orifice to be introduced into action chambers and formed at the opposite sides of the cam ring for controlling a discharge amount of the pump in accordance with the rotation speed of the pump. The differential pressure control valve is operated under the internal pressure and load pressure respectively introduced into action chambers and the load of a thrust spring biasing the differential pressure control valve toward the internal pressure chamber. The load of the thrust spring is increased or decreased in accordance with an increase or a decrease of the load pressure. The increase or decrease of the load pressure is effected by a load pressure responsive piston loaded by a thrust spring and engaged with the differential pressure control valve at one end thereof in the internal pressure chamber.

REFERENCES:
patent: 5090881 (1992-02-01), Suzuki et al.
patent: 5518380 (1996-05-01), Fujii et al.
patent: 5562432 (1996-10-01), Semba et al.
patent: 6375441 (2002-04-01), Ichizuki et al.
patent: 11093856 (1999-04-01), None
patent: 2000-170667 (2000-06-01), None
patent: 2000-170668 (2000-06-01), None
patent: 2002168181 (2002-06-01), None
patent: 2003083265 (2003-03-01), None
U.S. Appl. No. 10/432,615, filed Jun. 4, 2003, Suzuki et al.

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