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:
May. 26, 2009
Filed:
Jun. 16, 2006
Keisuke Kazuno, Iwata, JP;
Keisuke Kazuno, Iwata, JP;
NTN Corporation, , JP;
Abstract
A ball screw, which improves its durability under circumstances where a radial load and a moment load are applied to it, has a screw shaft () formed with a helical screw groove () on its outer circumferential surface. A nut () is adapted to mate with the screw shaft (). The nut () is formed with a helical screw groove () on its inner circumferential surface. The nut helical screw groove () corresponds to the screw shaft screw groove (). A number of balls () are rollably contained within a ball rolling passage formed by the oppositely arranged screw grooves (). Bridge members (), each formed with a connecting groove () on its inner circumferential surface, connect the screw grooves () of the nut (). A contact angle (α) between each ball () and one or both the screw grooves () is set within a range of about 20˜40°.