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:
Aug. 11, 2015
Filed:
Jun. 11, 2012
Toru Ishii, Gunma, JP;
Takeshi Yamamoto, Gunma, JP;
Katsuhiko Sawa, Gunma, JP;
NSK Ltd., , JP;
Abstract
Construction of an electric power-steering apparatus is achieved that, by stably suppressing backlash of an output shaftof an electric motorover a long period of time, is able to stably reduce vibration and strange noise that occurs during operation. The front end section of the output shaftand the base end section of a wormare connected such that torque can be transmitted and such that relative displacement in the axial direction is possible. An elastic memberhaving an elastic force in a direction that separates the output shaftand wormis provided in the connecting section between the output shaftand the worm. Due to the elastic force of the elastic member, together with the tandem arrangement contact angles, the preload is applied to a pair of ball bearingsthat support the output shaftwith respect to the motor casesuch that the output shaftcan rotate freely.