Variable displacement vane pump

Details Variable displacement vane pump Variable displacement vane pump

2011-01-04

2011-01-04

Denion, Thomas E (Department: 3748)

Rotary expansible chamber devices

With changeable working chamber magnitude

By cylinder or cylinder portion pivotal movement

C418S016000, C418S029000, C418S149000, C418S268000

Reexamination Certificate

active

07862311

ABSTRACT:
A variable displacement vane pump includes a pump body, a rotor, an annular cam ring, a rear body closing the pump body, a low pressure supply passage constantly connecting the inlet passage and the other of the first fluid pressure chamber and the second fluid pressure chamber, a low pressure introduction port formed in the other of the pressure plate and the rear body, and opened in the other of the first fluid pressure chamber and the second fluid pressure chamber, and a low pressure introduction passage formed in the other of the pressure plate and the rear body, the low pressure introduction passage connecting the low pressure introduction port and the inlet side vane back pressure grooves.

REFERENCES:
patent: 6976830 (2005-12-01), Uchino
patent: 7070399 (2006-07-01), Konishi et al.
patent: 7128542 (2006-10-01), Suzuki et al.
patent: 7682135 (2010-03-01), Ueki et al.
patent: 2005/0019175 (2005-01-01), Uchino et al.
patent: 2005/0047938 (2005-03-01), Konishi et al.
patent: 2003-172272 (2003-06-01), None

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