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:
Oct. 01, 2013
Filed:
May. 28, 2009
Keisuke Sone, Iwata, JP;
Hirokazu Ooba, Iwata, JP;
Kazuhiko Yoshida, Iwata, JP;
Kiyohiro Itou, Iwata, JP;
Keisuke Sone, Iwata, JP;
Hirokazu Ooba, Iwata, JP;
Kazuhiko Yoshida, Iwata, JP;
Kiyohiro Itou, Iwata, JP;
NTN Corporation, Osaka, JP;
Abstract
A fixed type constant velocity universal joint of an eight-ball undercut-free type has improved torque capacity at high operating angle while ensuring durability at low operating angle. Centers of a track groove () of an outer joint member and a track groove () of an inner joint member are respectively separated from a center plane (P) toward axially different sides, and are offset away from a joint center axis (X) to a radially opposite side relative to grooves (). When Rt represents a distance between a center of a ball () and the center of groove (), and F represents an axial distance between plane (P) and the center of groove (), a ratio Rbetween F and Rt is 0.061≦R≦0.087. When fr represents a radial offset amount as a distance between axis (X) and the center of groove (), a ratio Rbetween fr and Rt is 0.07≦R≦0.19.