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:
Sep. 18, 2000
Filed:
Jul. 30, 1997
Toyoda Koki Kabushiki Kaisha, Kariya, JP;
Abstract
In a power steering apparatus having a control valve with a first control valve portion and a second control valve portion to enhance rigidity of a steering operation, an amount of an overlapping portion of an overlap variable orifice is designed larger than an amount of an unlapping portion of an untapped variable orifice in the control valve because of dispersion during manufacture. When the overlap variable orifice finishes overlapping, the unlapped variable orifice has already started unlapping. Therefore, since the overlap variable orifice and the unlapped variable orifice never become unlapping form simultaneously regardless of the dispersion, the control valve is capable of minimizing a difference of the flow between a plurality of the second control valve portion. As a result, the power steering apparatus relative to the invention prevents enlargement of noise caused by an unbalance of the flow between a plurality of the second control valve portions in the control valve.