Variable displacement pump having a rotating cam ring

Details Variable displacement pump having a rotating cam ring Variable displacement pump having a rotating cam ring

2006-08-04

2009-02-17

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

With changeable working chamber magnitude

By cylinder or cylinder portion pivotal movement

C418S001000, C418S031000, C418S152000, C418S173000, C384S103000, C384S114000

Reexamination Certificate

active

07491043

ABSTRACT:
Vane pump (10) mechanical losses are reduced by removing vane friction losses and replacing them with lower magnitude journal bearing fluid film viscous drag losses. A freely rotating cam ring (70) is supported by a journal bearing (80). A relatively low sliding velocity is imposed between the cam ring and the vanes (26). This permits the use of less expensive and less brittle materials in the pump by allowing the pump to operate at much higher speeds without concern for exceeding vane tip velocity limits.

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