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. 09, 1993
Filed:
Feb. 04, 1992
Yasuyoshi Emori, Saitama, JP;
Jidosha Kiki Co., Ltd., Tokyo, JP;
Abstract
A hydraulic pressure acting in a hydraulic reaction chamber of a power steering system is controlled. A spool valve is formed with portions having a greater and a smaller diameter, which portions are partly situated in an annular groove formed in a valve opening and communicating with the hydraulic reaction chamber. A spring is disposed to one side of the spool valve nearer the portion of a greater diameter to urge it toward the portion of a smaller diameter. Toward the portion of a smaller diameter, the spool valve abuts against a rod of a solenoid. The hydraulic pressure from a pump is introduced into the annular groove through a variable throttle formed in the portion of a greater diameter while the hydraulic pressure in the annular groove is returned to a tank through a variable throttle formed in the portion of a smaller diameter. As the hydraulic pressure in the annular groove rises, the spool valve is shifted in accordance with a difference in the pressure responsive areas, thus suppressing an increase in the reaction pressure.