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:
Jan. 09, 2018
Filed:
Jul. 23, 2015
Jtekt Corporation, Osaka-shi, Osaka, JP;
Akiyoshi Tashiro, Yamatotakada, JP;
JTEKT CORPORATION, Osaka, JP;
Abstract
A ball screw apparatus includes a ball nut through which a ball screw shaft is inserted. A recessed portion is formed in an inner periphery of the ball nut and is recessed so as to extend in a tangential direction of a ball track. A ball train including a plurality of main balls and a coil spring are housed in a raceway. The recessed portion includes a first surface that supports a second end of the coil spring via a stopper ball and a second surface that regulates movement of the stopper ball in a nut axial direction. The second surface is inclined by an angle corresponding to a lead angle of the ball track of the ball nut from an axially perpendicular plane of the ball nut so as extend in the direction of the lead angle.