VARIABLE DISPLACEMENT PUMP HAVING A ROTATING CAM RING

Title:

VARIABLE DISPLACEMENT PUMP HAVING A ROTATING CAM RING

Document Type and Number:

WIPO Patent Application WO2002081921

Kind Code:

B1

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.

Inventors:

CLEMENTS MARTIN A (US)
HANSEN LOWELL D (US)

Application Number:

PCT/US2002/009298

Publication Date:

March 20, 2003

Filing Date:

March 27, 2002

Export Citation:

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Assignee:

ARGO TECH CORP (US)
CLEMENTS MARTIN A (US)
HANSEN LOWELL D (US)

International Classes:

F01C21/08; F04C2/344; F04C14/22; F04C15/00; (IPC1-7): F04C2/344; F04C15/04

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