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:
Sep. 11, 1984
Filed:
Mar. 09, 1983
Gary G Hegler, Chesaning, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A hydraulic power steering system has a vane type pump which is operable to supply fluid to a steering gear at a volumetric rate determined in part by the system pressure or the system demand. The vane pump flow is partially bypassed through a valve member disposed in the end cover and thrust plate of the pump. The valve is rotatably disposed in the end cover and spring loaded therein to a position which permits direct fluid communication between the pumping chambers and the pump inlet. The valve member has a portion thereof operated on by system pressure which is operable to close the bypass passages with increasing system pressure such that pump discharge flow to the power steering system will increase. The valve member can be moved sufficiently in response to system pressure to reopen the bypass passages thereby providing a limiting value for maximum system pressure.