Variable displacement pump

Details Variable displacement pump Variable displacement pump

2007-04-24

2007-04-24

Freay, Charles G. (Department: 3746)

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

C418S026000, C418S144000

Reexamination Certificate

active

11203138

ABSTRACT:
Within a cam ring (8), a rotor having a plurality of vanes (27) is eccentrically disposed. A metering orifice (136) is provided halfway on a discharge passage (135) of pressure fluid discharged from the pump, and a control valve is activated due to a pressure difference between the upstream and downstream sides of the metering orifice (136). A fluid pressure of the first fluid pressure chamber (21) is controlled by activation of the control valve (123). The second fluid pressure chamber (22) is shut off from the control valve (123) to introduce a pressure on the suction side at any time. To return the cam ring (8) in a direction of expanding a pump chamber (11), an internal pressure of the cam ring (8) is applied in the return direction.

REFERENCES:
patent: 5518380 (1996-05-01), Fujii et al.
patent: 5538400 (1996-07-01), Konishi et al.
patent: 6042343 (2000-03-01), Semba et al.
patent: 6155797 (2000-12-01), Kazuyoshi
patent: 6217296 (2001-04-01), Miyazawa et al.
patent: 6280150 (2001-08-01), Miyazawa
patent: 6352415 (2002-03-01), Uchino
patent: 6616419 (2003-09-01), Watanabe et al.
patent: 6709242 (2004-03-01), Mochiyama et al.
patent: 2015744 (1971-10-01), None
patent: 3214688 (1982-11-01), None

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