Variable displacement vane pump with dual control chambers

Details Variable displacement vane pump with dual control chambers Variable displacement vane pump with dual control chambers

2007-05-04

2011-11-15

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

08057201

ABSTRACT:
A variable capacity vane pump has a pump control ring which is moveable to alter the volumetric displacement of the pump. The pump ring is moved by at least first and second control chambers, which acts on the pump control ring when pressurized working fluid is supplied to them to move the pump control ring to alter the volumetric capacity of the pump. When pressurized fluid is supplied to only one control chamber, the pump operates at a first equilibrium pressure and when pressurized fluid is also supplied to the second chamber, the pump operates at a second equilibrium pressure. If desired, pressurized fluid can also be supplied only to the second control chamber to operate the pump at a third equilibrium pressure and/or additional control chambers can be provided if required.

REFERENCES:
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patent: 5236319 (1993-08-01), Fischer et al.
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patent: 6722856 (2004-04-01), Schneider
patent: 6763797 (2004-07-01), Staley et al.
patent: 7794217 (2010-09-01), Williamson et al.

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