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:
Jul. 11, 2000
Filed:
Jan. 27, 1999
Yoichi Matsumoto, Kanagawa, JP;
NSK Ltd., Tokyo, JP;
Abstract
A rolling bearing satisfies at least one of following requirements(1)-(4). (1) The radius r.sub.c of curvature at the joint between the head portion and the chamfered portion of said rolling element shall be not less than 0.2 mm. (2) The roughness (.sigma..sub.1.sup.2 +.sigma..sub.2.sup.2)1/2 resulting from the central line average roughness .sigma..sub.1 of the head portion of said rolling element and the central line average roughness .sigma..sub.2 of the main collar surface of the bearing ring shall be not more than 0.3 .mu.mRa. (3) The dimension y.sub.c of the chamfered portion lying between the head portion and the rolling surface of said rolling element in the direction along the diameter of said rolling element shall be not less than the height y.sub.k of the border line in the relief groove on the main collar surface of the bearing ring from the surface of the track. (4) The radius r.sub.k of curvature at the joint between the main collar surface and the chamfered portion of the bearing ring shall be not less than 0.2 mm. Accordingly, the life of a bearing in operation lubricated with a lubricant contaminated by water can be drastically prolonged.