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:
Apr. 02, 2019
Filed:
Mar. 22, 2018
Applicant:
Jtekt Corporation, Osaka-shi, Osaka, JP;
Inventor:
Akiyoshi Tashiro, Yamatotakada, JP;
Assignee:
JTEKT CORPORATION, Osaka-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16H 3/06 (2006.01); F16H 27/02 (2006.01); F16H 29/02 (2006.01); F16H 29/20 (2006.01); F16H 25/22 (2006.01); F16H 25/20 (2006.01);
U.S. Cl.
CPC ...
F16H 25/2238 (2013.01); F16H 25/2015 (2013.01);
Abstract
A ball screw device includes a screw shaft, a nut, a ball train including a plurality of main balls, and a plurality of coil springs disposed in the ball train. The nut moves from a first axial side to a second axial side while an axial force is applied to the nut by rotation of the screw shaft. The plurality of coil springs are more densely arranged on the first axial side than on the second axial side in the ball train.