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:
Oct. 27, 2020
Filed:
Feb. 12, 2018
Ntn Corporation, Osaka, JP;
Tomoki Matsushita, Shizuoka, JP;
Takashi Kawai, Shizuoka, JP;
NTN CORPORATION, Osaka, JP;
Abstract
A tapered roller bearing includes inner and outer rings having tapered raceway surfaces. The inner ring also includes large-collar and small-collar surfaces respectively on large-diameter and small-diameter sides of its raceway surface. A plurality of tapered rollers are arrayed between the raceway surfaces. Each of the tapered rollers has a large end surface that contacts and is guided by the large-collar surface. A set curvature radius (R) of the large end surface of each of the tapered rollers and a base curvature radius (R) from a vertex of a cone angle of each of the tapered rollers to the large-collar surface has a ratio R/Rin a range of 0.75 to 0.87, and when Rrepresents an actual curvature radius of the large end surface, a ratio R/R is equal to or larger than 0.5.