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:
Apr. 01, 2014
Filed:
Mar. 23, 2011
Yoshinori Terasaka, Iwata, JP;
Tomoshige Kobayashi, Iwata, JP;
Kisao Yamazaki, Iwata, JP;
Minoru Ishijima, Iwata, JP;
Yoshinori Terasaka, Iwata, JP;
Tomoshige Kobayashi, Iwata, JP;
Kisao Yamazaki, Iwata, JP;
Minoru Ishijima, Iwata, JP;
NTN Corporation, Osaka, JP;
Abstract
A constant velocity universal joint has track shapes which facilitate quality control on a forging die set, securing higher durability through securement of a stable contact state of forging-molded tracks and finishing-processed tracks with respect to balls. At least one of each of track grooves of an outer joint member and each of track grooves of an inner joint member is formed by cold-forging finishing. A track groove bottom side of the at least one of each of the track grooves is formed into a Gothic arch shape in horizontal cross-section, and a track groove opening side of the at least one of each of the track grooves is are each formed into an elliptical shape in horizontal cross-section.