Rotary expansible chamber devices – With changeable working chamber magnitude – Spring or fluid biased movable member
Reexamination Certificate
2011-08-09
2011-08-09
Trieu, Theresa (Department: 3748)
Rotary expansible chamber devices
With changeable working chamber magnitude
Spring or fluid biased movable member
C418S027000, C418S030000, C417S220000
Reexamination Certificate
active
07993116
ABSTRACT:
A variable displacement vane pump includes a rotor, a cam ring; and a pump casing including first and second side walls disposed on both sides of the cam ring, and a circumferential wall surrounding the cam ring and defining first and second pressure chambers. A pressure introduction groove is formed in a sliding contact surface between the cam ring and one of the first and second side walls, and arranged so that a pressure lower than an outlet pressure is introduced.
REFERENCES:
patent: 7318705 (2008-01-01), Uchino et al.
patent: 2005/0019174 (2005-01-01), Uchino et al.
patent: 10 2004 035 743 (2005-02-01), None
patent: 2003-21076 (2003-01-01), None
Hoshina Norikatsu
Muto Takao
Soeda Jun
Uchida Yukio
Foley & Lardner LLP
Hitachi , Ltd.
Trieu Theresa
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