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. 17, 2004
Filed:
Jul. 17, 2002
Yasumi Watanabe, Gunma, JP;
NSK Ltd., Tokyo, JP;
Abstract
In the ball screw, a ball circulation tube is formed to have such a shape that the movable amount of balls in a first direction (X) intersecting at right angles to the axis of the tube is larger than the movable amount of the balls in a second direction (Y) intersecting at right angles to the first direction (X), and the ball circulation tube is fixed to a nut in such a manner that the outer surface of the tube extending in parallel with the first direction (X) is opposed to the outer surface of the nut . Accordingly, it is possible to provide a ball screw which can restrict variations in the torque of the ball screw caused by the mutual sliding movements of balls occurring within a ball circulation tube.