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:
Jul. 19, 2022
Filed:
Apr. 22, 2019
Nsk Ltd., Tokyo, JP;
Keitaro Oka, Fujisawa, JP;
NSK LTD., Tokyo, JP;
Abstract
A ball screw includes: a screw shaft () having a spiral first screw groove () formed in an outer peripheral surface thereof; a nut () disposed on the periphery of the screw shaft () and having a spiral second screw groove () formed in an inner peripheral surface thereof; a plurality of balls () accommodated in a rolling path () formed by the opposing screw grooves (); and a circulation piece () that forms a ball return passage () for circulating the plurality of balls () through one circuit or less of the rolling path (). Traffic variation is made to be small by determining the maximum angle of inclination (α) of the ball return passage () in an expression using the lead (L), the ball diameter (Da), and the lead angle (β).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile