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. 21, 2012
Filed:
Jun. 16, 2005
Takashi Tsujimoto, Iwata, JP;
Takashi Tsujimoto, Iwata, JP;
NTN Corporation, Osaka, JP;
Abstract
A tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers which are rollably disposed between the inner ring and the outer ring, and a retainer which retains the tapered rollers at predetermined circumferential intervals. In this tapered roller bearing, a roller coefficient γ=(the number of rollers×average roller diameter) exceeds 0.94, a number of indentations having a micro recess-like shape are randomly provided at least on a surface of the tapered roller, a surface roughness parameter Ryni of the surface having the indentations falls within a range of 0.4 μm≦Ryni≦1.0 μm, and an Sk value is −1.6 or less.