Patent ID: 7566212

Claim:
A vane pump comprising: a rotor accommodated in a rotor chamber; a plurality of vanes attached to the rotor, each of the vanes having a leading end adapted to make sliding contact with an inner peripheral surface of the rotor chamber; working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor and the vanes, the working compartments being adapted to undergo a volume change as the rotor is rotatably driven; an inlet port through which a working fluid is drawn into a working compartment whose volume is being increased; and an outlet port through which the working fluid is discharged from a working compartment whose volume is being decreased; and at least one blade base member protruded from portions on the outer peripheral surface of the rotor between the vanes adjacent to each other, wherein a guide surface formed at a leading side of each of the blade base members as viewed in a rotating direction of the rotor is inclined with respect to a thrust direction of the rotor.