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:
Feb. 26, 2008
Filed:
Feb. 27, 2004
Applicants:
Kouichi Okugami, Iwata, JP;
Yoshinori Muramatsu, Iwata, JP;
Chikara Ohki, Kuwana, JP;
Inventors:
Assignee:
NTN Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16C 33/62 (2006.01); F16C 33/58 (2006.01); C23C 8/32 (2006.01);
U.S. Cl.
CPC ...
Abstract
A structure supporting a differential rotatably includes an inner ring arranged at the differential, an outer ring arranged at an external peripheral portion formed to surround the differential, and a tapered roller rolling between the inner ring and the outer ring. At least any one of the inner ring, the outer ring and the tapered roller has a carbo-nitrided layer and provides an austenite grain number falling within a range exceeding 10. Thus the structure can be provided with increased anti-crack strength and dimensional stability, and increased rolling contact fatigue life.