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. 25, 2008
Filed:
May. 10, 2007
Toru Segawa, Maebashi, JP;
Kazuo Chikaraishi, Maebashi, JP;
Toru Segawa, Maebashi, JP;
Kazuo Chikaraishi, Maebashi, JP;
NSK Ltd., Tokyo, JP;
NSK Steering Systems Co., Ltd., Tokyo, JP;
Abstract
A torsion coil springapplies an elastic force to a worm shaftin a direction towards a worm wheel, via a pre-load pad. The pre-load padrestricts displacement in relation to the widthwise direction, by one side face portion of a holderfixed to a gear housing. Due to the elastic deformation of the pre-load paditself based on the elastic force of the torsion coil spring, the side face of the pre-load padis abutted against the one side face portion of the holder, so that a gap between the pre-load padand the one side face portion is minimized. As a result, the occurrence of a teeth fitting noise in the worm reduction gearis suppressed.