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:
Aug. 14, 1984
Filed:
Sep. 21, 1982
Akira Hasegawa, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
A changeover valve unit for a power-assisted steering system includes input and output shafts arranged within a valve housing for relative rotation on aligned axes, a spool valve element concentrically assembled with the input shaft to be axially moved in response to relative rotation of the shafts for controlling the supply of fluid under pressure to a hydraulic cylinder associated with the steering system. An annular seal member of elastic material is secured at its inner periphery to the input shaft and is integrally formed with an annular lip facing the inner periphery of the spool valve element with a predetermined annular clearance. The annular lip is expanded outwardly by back pressure acting on the spool valve element at a higher level than a predetermined value and is brought into engagement with the inner periphery of the spool valve element.