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:
Dec. 13, 1988
Filed:
Sep. 02, 1987
Hirotetu Sonoda, Saitama, JP;
Jidosha Kiki Co., Ltd., Tokyo, JP;
Abstract
The invention relates to a steering force controller for power steering apparatus which controls a steering force by controlling an oil pressure supplied to an oil pressure reaction chamber of a reaction mechanism. A pressure controlling mechanism which controls the oil pressure supplied to the oil pressure reaction chamber operates to increase a channel area between a reaction passage which communicates with the oil pressure reaction chamber and a feed passage which communicates with the discharge port of a pump and at the same time reduce a channel area between the reaction passage and a discharge passage which communicates with a tank associated with the pump in accordance with a displacement of the spool in one direction which is caused by a solenoid. In this manner, the flexibility in controlling the pressure within the reaction chamber is enhanced. Chambers formed at the opposite ends of the spool valve communicate with the tank and are maintained under a low pressure.