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:
Sep. 04, 2018
Filed:
May. 26, 2014
Hiroyasu Hirukawa, Shizuoka, JP;
Teruaki Fujio, Shizuoka, JP;
Hiroyasu Hirukawa, Shizuoka, JP;
Teruaki Fujio, Shizuoka, JP;
NTN CORPORATION, Osaka, JP;
Abstract
A fixed type constant velocity universal joint of a track groove crossing type has track grooves of an inner joint member formed to be mirror-image symmetrical with paired track grooves of an outer joint member with respect to a joint center plane at an operating angle of 0°. The track grooves of both the joint members each have a length corresponding to a maximum operating angle (θmax) required for a propeller shaft, and surface treatment is performed, for example, on a defined surface of each of the track grooves of the outer joint member so as to reduce frictional resistance (sliding resistance) against balls.