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. 18, 2012
Filed:
May. 07, 2009
Tomoshige Kobayashi, Iwata, JP;
Kenta Yamazaki, Iwata, JP;
Teruaki Fujio, Iwata, JP;
NTN Corporation, Osaka, JP;
Abstract
A fixed type constant velocity universal joint is capable of securing a ball groove depth larger than conventional products and enhancing performance without an increase in a 'force of pushing out balls in an axial direction', the force having an influence on joint efficiency. In the fixed type constant velocity universal joint, a center of each of a plurality of guide grooves of an outer joint member and a center of each of a plurality of guide grooves of an inner joint member are offset with respect to a spherical surface center of an inner surface and a spherical surface center of an outer surface. A ratio (F/PCR) of an offset amount F to a length of a segment (PCR) ranges from 0.045 to 0.065. A ratio (αt/α) when an angle α is the total of an angle αt and an angle αc ranges from 0.45 to 0.65.