Variable displacement vane pump

Details Variable displacement vane pump Variable displacement vane pump

2011-01-04

2011-01-04

Kramer, Devon C (Department: 3746)

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

C418S030000

Reexamination Certificate

active

07862305

ABSTRACT:
A variable displacement vane pump, including a pump body, a driving shaft, a rotor, a cam ring swingable around a swing fulcrum, first and second support members on opposite axial sides of the cam ring, a suction port and a discharge port disposed on at least one of the support members, a seal dividing a space on an outer circumferential side of the cam ring into a first fluid pressure chamber defined in a direction in which the cam ring is swung to cause increase in a flow rate of a working fluid discharged, and a second fluid pressure chamber defined in a direction in which the cam ring is swung to cause decrease in the flow rate of the working fluid discharged, and a plunger biasing the cam ring from a side of the second fluid pressure chamber toward a side of the first fluid pressure chamber.

REFERENCES:
patent: 6217296 (2001-04-01), Miyazawa et al.
patent: 6616419 (2003-09-01), Watanabe et al.
patent: 6709242 (2004-03-01), Watanabe et al.
patent: 6976830 (2005-12-01), Uchino
patent: 2006/0034721 (2006-02-01), Uchino
patent: 2003-74479 (2003-03-01), None
Chinese Office Action for corresponding Chinese Patent Application No. 200610171166.5, dated May 23, 2008 (English translation).
U.S. Appl. No. 12/048,773, filed Mar. 14, 2008, Yamamuro et al.

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