Patent ID: 7628594
Filing Date: 2009-12-08
Classification: F01C,F04C

Abstract:
1. A vane pump comprising: a rotor chamber; a rotor eccentrically accommodated in the 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; an outlet port through which the working fluid is discharged from a working compartment whose volume is being decreased; a casing comprised of a first case having a first recess and a second case having a second recess, the second recess having an inner diameter smaller than an inner diameter of the first recess, wherein the first and the second recesses form the rotor chamber; and a labyrinth seal portion formed between a bottom surface of the first recess and a surface of the rotor facing the bottom surface of the first recess, the labyrinth seal portion including at least one pair of a protrusion section and a recessed section extending along a circumferential direction of the rotor and having a gap therebetween.