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. 24, 2012
Filed:
Jan. 30, 2008
Hisaaki Kura, Iwata, JP;
Shin Tomogami, Iwata, JP;
Tomoshige Kobayashi, Iwata, JP;
Teruaki Fujio, Iwata, JP;
Takeshi Kohara, Iwata, JP;
Tomoaki Kaneko, Iwata, JP;
Hisaaki Kura, Iwata, JP;
Shin Tomogami, Iwata, JP;
Tomoshige Kobayashi, Iwata, JP;
Teruaki Fujio, Iwata, JP;
Takeshi Kohara, Iwata, JP;
Tomoaki Kaneko, Iwata, JP;
NTN Corporation, Osaka, JP;
Abstract
A fixed type constant velocity universal joint includes an outer joint member having an inner spherical surface in which a plurality of track grooves extending in an axial direction are formed; an inner joint member having an outer spherical surface in which a plurality of track grooves extending in the axial direction while paired with the track grooves of the outer joint member are formed. A plurality of balls are interposed between the track grooves of each of the outer joint member and the inner joint member, for transmitting a torque, and a cage is interposed between the inner spherical surface of the outer joint member and the outer spherical surface of the inner joint member, for holding the balls. The outer joint member and the inner joint member each have a center curvature of the track grooves being offset from each other in a direction opposite to the axial direction by an equal distance with respect to a joint center, in which: a PCD gap (2×m) in a ball track formed between the track grooves of each of the outer joint member and the inner joint member is set to equal to or larger than 25 μm.