Patent ID: 7425121
Filing Date: 2008-09-16
Classification: F01C,F04C,F05C,H02K

Abstract:
1. A rotary vane pump for pumping a fluid, the rotary vane pump comprising: (a) a pump housing defining an interior chamber having a sealing surface; (b) a rotor rotatingly disposed within the interior chamber, the rotor having a plurality of slots; (c) a plurality of vanes, each vane moveably disposed in one of the plurality of slots; (d) an input shaft coupled to the rotor for applying a torque to the rotor, wherein the input shaft and rotor are a unitary, integrally formed component; (e) wherein the plurality of vanes are actuatable into a substantially sealing relationship with the sealing surface of the pump housing by centrifugal forces and hydraulic forces and not mechanical forces during pumping of the fluid; and (f) a fixed shaft disposed in the housing and wherein the rotor includes a bore for rotatingly receiving the fixed shaft, wherein the input shaft includes a fluid passageway passing axially through the input shaft.