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

F - Mech Eng,Light,Heat,Weapons

04

C

F04C 2/344 (2006.01) F01C 21/08 (2006.01)

Patent

CA 2443367

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.

Pour réduire les pertes mécaniques d'une pompe à palettes (10), on élimine les pertes dues à des frottements au profit de pertes de moindre importance dues au freinage visqueux d'un film fluide de palier lisse. Ledit palier lisse (80) supporte une cage ovale (70) tournant librement. La vitesse de coulissement entre la cage ovale et les palettes (26) est relativement faible, ce qui permet d'utiliser des matériaux moins chers et moins cassants dans la pompe du fait que celle-ci fonctionne à des vitesses beaucoup plus élevées sans tenir compte du dépassement de limite de vitesse des pointes de palette.

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