The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 10, 2009
Filed:
Oct. 25, 2005
Cezar Tanasuca, Richmond Hill, CA;
Cezar Tanasuca, Richmond Hill, CA;
Magna Powertrain Inc., Concord, Ontario, CA;
Abstract
A novel variable displacement vane pump is provided wherein pressurized working fluid is provided to a portion of the pump chamber to act on the outside of the capacity varying ring to substantially balance the force created by the high pressure working fluid inside the ring. As the resultant high pressure force acting on the pivoting pin is reduced, the movement of the displacement control ring is smoother, reducing undesirable hysteresis, the wear on the pin is reduced and the additional force required to move the ring to vary the volumetric displacement of the pump is less than would otherwise be needed, allowing the related control mechanisms to be smaller.