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. 08, 2007
Filed:
Dec. 13, 2004
Tohru Nakagawa, Shizuoka-ken, JP;
Morihiro Wada, Shizuoka-ken, JP;
Tohru Nakagawa, Shizuoka-ken, JP;
Morihiro Wada, Shizuoka-ken, JP;
NTN Corporation, Osaka-fu, JP;
Abstract
A fixed constant velocity universal joint includes: an outer ring having a plurality of track grooves extending axially in its inner spherical surface; an inner ring having a plurality of track grooves extending axially in its outer spherical surface; torque transmission balls arranged in ball tracks formed by cooperation of the track grooves of the outer ring and the track grooves of the inner ring; and a cage having pockets for retaining the torque transmission balls. The center of the track grooves of the outer ring and the center of the track grooves of the inner ring are offset from the spherical center of the inner spherical surface and the spherical center of the outer spherical surface, respectively, by the same distance axially in opposite directions. An axial clearance between the pockets and the torque transmission balls is set within the range of −0.006 and −0.035 mm. A spherical portion clearance between the cage and the inner ring is set so that a clearance-to-diameter ratio falls within the range of 0.9 and 2.3.