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. 12, 1998
Filed:
Sep. 28, 1995
Applicant:
Inventors:
Ken Namimatsu, Maebashi, JP;
Manabu Matsuura, Takasaki, JP;
Assignee:
NSK, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16H / ;
U.S. Cl.
CPC ...
74459 ; 7442 / ;
Abstract
A ball screw device is designed such that a load axially applied to a ball nut is uniformly supported by balls of all ball screw groove portions. The design is such that a gap along a load acting line between a ball and a ball screw groove portion farther from an attachment portion of the ball nut is smaller than a gap between a ball and a ball screw groove portion closer to the attachment portion, by an amount corresponding to an elastic deformation caused in the corresponding screw groove portion of the ball nut by a load acting on the ball nut.