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. 06, 1988
Filed:
Jul. 06, 1987
William R Schipper, Clio, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A variable effort power steering system for an automobile includes a rotary valve power steering gear, a detent type variable effort detent system whereby a fluid detent pressure proportional to vehicle speed operates on a detent between an input member of the steering gear and an output member of the steering gear to prevent relative angular displacement therebetween until steering handwheel effort exceeds a threshold magnitude increasing with increasing detent pressure, and a shunt system between the two working chambers of the steering assist fluid motor. The shunt system includes a shunt valve in a shunt passage between the working chambers which is closed at zero or low vehicle speed and is progressively opened by detent pressure as vehicle speed increases whereby progressively more fluid is shunted from the active working chamber to the reservoir at higher vehicle speeds. By shunting fluid to the reservoir, the increase in steering assist boost pressure is rendered more linear relative to handwheel effort.