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. 27, 2002
Filed:
May. 19, 1999
Applicant:
Inventors:
Assignee:
nNSK Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16H 2/702 ; F16H 2/902 ;
U.S. Cl.
CPC ...
F16H 2/702 ; F16H 2/902 ;
Abstract
A ball nut has a dowel for circulating balls . A cage type retainer is disposed between a screw shaft and the ball nut which engages with the screw shaft through the ball . The retainer is provided with a plurality of elongated holes at a peripheral surface thereof to extend to an axial direction thereof so as to separate the balls from one another in a peripheral direction thereof and to hold the balls therein to be free to roll. The distance of a space between the screw shaft and the cage type retainer is set to be smaller than that of a space between the dowel and the cage type retainer n the radial direction of the screw shaft.