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. 21, 2000
Filed:
Oct. 13, 1998
Eugen Eberhart, Dusseldorf, DE;
Lars Hampe, Dusseldorf, DE;
TRW Fahrwerksysteme GmbH & Co. KG, Dusseldorf, DE;
Abstract
To provide a particularly simple and cost effective design of a power-assisted steering unit for motor vehicles for supplying a servo-cylinder (3) with a hydraulic fluid as a function of the travelling speed and the steering rate, comprising a steering valve (1) by means of which the left and right chambers (16, 17) of the servo-cylinder (3) can be pressurized with hydraulic fluid via a pump (2) when there is a steering movement, and a bypass valve (10) connected in parallel to the servo-cylinder (3), by means of which a portion of the hydraulic fluid for pressurizing the servo-cylinder (3) that is directed past the servo-cylinder (3) is controlled, a throttling unit (26) is connected in series with the bypass valve (10). The hydraulic fluid inflow or return flow of the servo-cylinder (3) flows through this throttling unit (26) depending on the steering direction. The throttling unit (26) automatically throttles the flow of hydraulic fluid that is directed through the bypass valve (10) starting from a predetermined value of such volume flow. Furthermore defined is an assisted-power unit for motor vehicles for supplying hydraulic fluids to a servo-cylinder (3) as a function of the travelling speed, wherein the bypass valve (10) is designed as a proportional valve to achieve a particularly compact and cost effective form of construction.