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:
Jan. 11, 2022
Filed:
Sep. 26, 2018
Ntn Corporation, Osaka, JP;
Takanori Ishikawa, Iwata, JP;
Takashi Kawai, Iwata, JP;
Tomoki Matsushita, Iwata, JP;
Nozomi Isobe, Iwata, JP;
NTN CORPORATION, Osaka, JP;
Abstract
A difference between a maximum value and a minimum value of arithmetic mean roughness Ra of an annular surface region in contact with a larger flange surface, in a larger end face of the tapered roller, is not greater than 0.02 μm. 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 the 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 the larger flange surface of the inner ring. A ratio R/R is not lower than 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.