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:
Oct. 06, 1992
Filed:
Mar. 19, 1991
Yasuyoshi Emori, Saitama, JP;
Yukimitsu Minamibata, Saitama, JP;
Jidosha Kiki Co., Ltd., Tokyo, JP;
Abstract
A reaction pressure control mechanism of power steering apparatus includes a power cylinder, to which a pressure oil discharged from an oil pump is supplied through a control valve, and oil discharged from the oil pump is branched to be introduced into a hydraulic reaction chamber, which produces steering reaction. A pair of variable restrictions are formed in a supply and discharge passage to and from the hydraulic reaction chamber, and a single spool which is operated by a solenoid is effective to increase the opening of one of the variable restrictions while reducing the opening of the other restriction. A plunger is disposed in opposing relationship with a rod associated with the solenoid and on which the spool is fixedly mounted so that when the oil pressure in the reaction chamber exceeds a given value, such oil pressure is introduced to the backside of the plunger to cause the spool to be driven back, thus reducing the opening of the variable restriction associated with the supply passage.