Variable displacement vane pump

Details Variable displacement vane pump Variable displacement vane pump

2007-09-25

2011-10-18

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

With changeable working chamber magnitude

Spring or fluid biased movable member

C418S027000, C418S030000, C418S075000, C418S082000, C418S133000, C417S220000

Reexamination Certificate

active

08038420

ABSTRACT:
A variable displacement vane pump that assuredly suppresses seizing of mutually contacting surfaces of a pressure plate and a rotor where the pressure plate is formed, at one side surface thereof that slidably contacts the rotor, with an annular lubricating groove. The lubricating groove is on a seal surface of the side surface at a position between arcuate back pressure grooves formed on the seal surface and a through opening which is formed in a center part of the pressure plate to receive the drive shaft. A radial width of the lubricating groove is set to a range from 10% to 25% of a radial width of the seal surface, and a distance from a center of the radial width of the lubricating groove to an inner cylindrical surface of the through opening is set to a range from 24% to 70% of the radial width of the seal surface.

REFERENCES:
patent: 6375441 (2002-04-01), Ichizuki et al.
patent: 6503068 (2003-01-01), Kojima et al.
patent: 7070399 (2006-07-01), Konishi et al.
patent: 2002/0064471 (2002-05-01), Kojima et al.
patent: 59-123690 (1984-08-01), None
patent: 2000-337267 (2000-12-01), None
patent: 2004-245089 (2004-09-01), None

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