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:
Feb. 18, 2003
Filed:
Mar. 10, 2000
Chaojiu Wang, Tochigi, JP;
Showa Corporation, , JP;
Abstract
A hydraulic power steering apparatus which is arranged so that a damper valve is disposed in hydraulic oil circuits and for connecting an oil passage selector valve in a gear box with right and left oil chambers of a power cylinder . The damper valve comprises a spool valve. And a control oil chamber of the spool valve is connected with a hydraulic oil feed passage for connecting a hydraulic pump which is driven by an internal combustion engine so as to discharge hydraulic oil, with the oil passage selector valve . Its back pressure chamber is connected with a hydraulic oil circulating passage for connecting the oil passage selector valve with a reservoir tank . Orifices and are provided in connecting oil passages and , such that when discharge oil pressure of the hydraulic pump rises, opening of the spool valve increase.