Patent ID: 9127674
Filing Date: 2015-09-08
Classification: F01C,F04C

Abstract:
1. A fixed displacement vane pump comprising, in combination, a housing for receiving a body defining a cylindrical pumping chamber having a wall and first and second port plates defining axial ends of said pumping chamber, one of said port plates including a surface exposed to fluid pressurized by said fixed displacement vane pump, a rotor disposed eccentrically in said pumping chamber, said rotor having a shaft extending through said first and said second port plates and defining a plurality of circumferentially spaced-apart slots and axially extending circumferential lips defining opposed re-entrant end portions, a plurality of vanes disposed in said slots, said vanes having outer edges adapted to contact said wall of said pumping chamber, first and second bearings disposed between said shaft and said housing for rotatably supporting said shaft, a ring disposed in each of said re-entrant end portions, said vanes having inner edges adapted to contact said rings whereby said vanes are constrained to move radially between said wall of said pumping chamber and said rings as said rotor rotates, and a Belleville washer for axially biasing said body and said port plates together, said Belleville washer having a center opening for receiving said shaft.