Patent ID: 7086845

Claim:
A vane pump comprising: a pump housing having a longitudinal axis; a thrust plate disposed in said housing having an axially inner face; a pressure plate disposed in said housing in axially spaced relation to said thrust plate and having an axially inner face; a cam ring disposed in said housing between said plates and having an inner cam wall; a rotor supported within said cam ring for rotation relative to said cam ring and said plates, said rotor having axially opposite surfaces adjacent said axially inner faces of said plates and an outer peripheral surface adjacent said inner cam wall of said cam ring; a plurality of vanes slideably supported within associated radial vane slots of said rotor for radial reciprocation in communication with said inner cam wall during rotation of said rotor; and an abradable coating material applied to said axially opposite and outer peripheral surfaces of said rotor adjacent said inner faces of said plates and said cam surface of said cam ring, and wherein said plates and said cam ring are free of said coating material.