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. 05, 2022
Filed:
Mar. 26, 2019
Ntn Corporation, Osaka, JP;
Takanori Ishikawa, Iwata, JP;
Takashi Kawai, Shizuoka, JP;
Yasuhito Fujikake, Iwata, JP;
Susumu Miyairi, Shizuoka, JP;
NTN CORPORATION, Osaka, JP;
Abstract
In the tapered roller bearing, at least any one of an outer ring, an inner ring, and a plurality of tapered rollers includes a nitrogen enriched layer. An oil retaining hole is provided in a larger annular portion of a cage. A value of a ratio R/Ris not smaller than 0.75 and not greater than 0.87 where R represents a set radius of curvature of a larger end face of the tapered roller and Rrepresents a distance from a point which is an apex of a cone angle of the tapered roller to a larger flange surface of the inner ring. A ratio R/R is than not lower 0.5 where Rrepresents an actual radius of curvature after grinding of the larger end face of the tapered roller and R represents a set radius of curvature.