Continuously variable displacement vane pump and system

Details Continuously variable displacement vane pump and system Continuously variable displacement vane pump and system

2007-05-04

2011-11-01

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

08047822

ABSTRACT:
A vane pump (20) is provided which has an output pressure hat can be selected from a continuous range of pressures, independent of the operating speed of the pump. The pump has first (68) and second (72) control chambers which create opposed forces on the pump control ring (40) to selectively move the pump control ring (40) between maximum displacement and minimum displacement positions. In one embodiment, the control chamber (68) which urges the ump control ring to the minimum displacement position is continually supplied with pressurized working fluid during operation of the ump while the control chamber (72) which urges the pump control ring to the maximum displacement position can selectively be supplied with pressurized working fluid, isolated, or can be relieved of pressurized working fluid to alter the displacement of the pump.

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