Vane pump having a labyrinth seal and gap between a top...

Details Vane pump having a labyrinth seal and gap between a top... Vane pump having a labyrinth seal and gap between a top...

2007-11-21

2009-12-08

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

With mechanical sealing

Seal element between working member and cylinder

C418S077000, C418S259000, C418S268000

Reexamination Certificate

active

07628594

ABSTRACT:
A vane pump includes a rotor chamber; a rotor eccentrically accommodated in the rotor chamber; a plurality of vanes attached to the rotor, each vane having a leading end adapted to make sliding contact with an inner peripheral surface of the rotor chamber. The vane pump includes working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor, and the vanes; an inlet port through which a working fluid is drawn into a working compartment; and an outlet port through which the working fluid is discharged from a working compartment. An engaging portion is formed in a peripheral end portion of a thrust surface of the rotor and an engaged portion with which the engaging portion engages in a non-contact state is formed in an inner surface region of the rotor chamber facing the thrust surface of the rotor in a non-contact state.

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