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. 08, 2000
Filed:
Sep. 23, 1997
Koyo Seiko Co., Ltd., Osaka, JP;
Abstract
A servo valve for a power assisted steering gear for producing an auxiliary steering force corresponding to twist between an input member and an output member which are connected to each other by a torsion bar is disclosed. There is provided a sleeve member surrounding a torsion bar and having first and second ends. The first end is prevented from being rotated with respect to the torsion bar. The second end is provided with an opening extending along the radius of the sleeve member. A plunger-containing hole extending in the radial direction is formed in an intermediate part between opposite ends of the torsion bar, and plungers are contained in the containing hole which are movable forward and backward. The plungers are urged forward by a helical compression spring interposed between the plungers. Each of the urged plungers is engaged with an edge of the opening serving as a holding arrangement, to increase the torsional rigidity of the torsion bar at the time when the valve is neutral.