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. 09, 1976
Filed:
Oct. 20, 1975
Thomas W Weisgerber, Saginaw, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A vehicle steering system wherein a manual steering gear output controls actuation of a linear hydraulic motor. A control valve, which distributes fluid to and from the boost cylinder, is disposed between the pitman shaft and pitman arm of the manual steering gear. Rotation of the pitman shaft, in response to operator input, causes rotation of the control valve which directs fluid pressure to the hydraulic motor to provide steering assist. The fluid pressure is also directed, through the control valve, to selectively operate on hydraulic reaction members so that a force proportional to steering effort is transmitted back to the operator. A mechanical 'overcenter feel' is also provided and has incorporated therewith a mechanical override to provide full manual steering when there is not sufficient fluid pressure to provide hydraulic assist for steering.