Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Tom Cheuk-In Wong0
Albert Cheuk-Yin Wong0
Date of Patent
August 8, 2006
Patent Application Number
10349945
Date Filed
January 23, 2003
Patent Primary Examiner
Patent abstract
A vane pump includes a cylindrical rotor rotatable inside of an oval-shaped rotor chamber of cam ring disposed between a pressed plate and a pressure plate. The rotor has opposite sides and a peripheral outer surface in which radial vane slots are formed and guide slideable vanes. The rotor is coated on its surfaces with a film of abradable coating material which reduces the operating clearance between the rotor and the thrust and pressure plates and cam ring so as to increase the volumetric efficiency of the pump.
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