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. 10, 2012
Filed:
Apr. 25, 2007
Takashi Ueno, Iwata, JP;
Takashi Ueno, Iwata, JP;
NTN Corporation, Osaka, JP;
Abstract
In a tapered roller bearing, the roller coefficient γ is greater than 0.94. At least one member of an inner ring, an outer ring, and the tapered rollers includes a nitrogen-rich layer, and the grain size number of austenite crystal grains in the nitrogen-rich layer is greater than 10. A cage of the tapered roller bearing includes a small annular portion continuous on a small end face side of the tapered rollers, a large annular portion continuous on a large end face side of the tapered rollers, and a plurality of bars that connect the small and large annular portions. The cage has trapezoidal pockets between adjacent ones of the bars. Each of the bars has cut-away portions on the narrow side of the pockets.