Rotary expansible chamber devices – Non-radially positioned sliding vane or abutment
Reexamination Certificate
2007-06-05
2007-06-05
Trieu, Theresa (Department: 3748)
Rotary expansible chamber devices
Non-radially positioned sliding vane or abutment
C418S259000, C418S268000, C073S040000
Reexamination Certificate
active
11266377
ABSTRACT:
A vane pump is composed of a casing having a cylindrical inner bore and a rotor disposed in the inner bore with an eccentric relation to the inner bore. A circular pump chamber formed between the rotor and the inner bore is divided by vanes disposed in the rotor into plural pump chambers each changing its capacity according to rotation of the rotor. The vane is slidably disposed in a groove formed in the rotor in a slanted relation with respect to a rotational axis of the rotor. When the rotor rotates, the vane is pushed backward of the rotational direction by fluid in the pump chamber. The pushing force includes a component for pushing the vane upward toward an upper plate closing an upper opening of the inner bore. The vane is pushed against the upper plate to thereby prevent hitting noises between the vane and the upper plate.
REFERENCES:
patent: 2195812 (1940-04-01), Czarnecki
patent: 6537047 (2003-03-01), Walker
patent: 2004/0149016 (2004-08-01), Kano et al.
patent: 57083689 (1982-05-01), None
patent: 63263283 (1988-10-01), None
patent: 6-147156 (1994-05-01), None
Kato Yasuo
Yamada Yoshichika
DENSO Corporation
Nixon & Vanderhye PC
Trieu Theresa
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