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. 01, 2011
Filed:
May. 04, 2007
David R. Shulver, Richmond Hill, CA;
Adrian C. Cioc, Ajax, CA;
David R. Shulver, Richmond Hill, CA;
Adrian C. Cioc, Ajax, CA;
Magna Powertrain Inc., Concord, CA;
Abstract
A vane pump () is provided which has an output pressure hat can be selected from a continuous range of pressures, independent of the operating speed of the pump. The pump has first () and second () control chambers which create opposed forces on the pump control ring () to selectively move the pump control ring () between maximum displacement and minimum displacement positions. In one embodiment, the control chamber () which urges the ump control ring to the minimum displacement position is continually supplied with pressurized working fluid during operation of the ump while the control chamber () which urges the pump control ring to the maximum displacement position can selectively be supplied with pressurized working fluid, isolated, or can be relieved of pressurized working fluid to alter the displacement of the pump.