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:
Mar. 14, 1995
Filed:
Aug. 25, 1993
Applicant:
Inventors:
Assignee:
NTN Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16C / ; F16C / ;
U.S. Cl.
CPC ...
384492 ; 384565 ; 384625 ;
Abstract
A rolling member which has improved strength and permits stable formation of oil films between its rolling surface and its mating surface and which shows a long life even under unfavorable lubricating conditions. The surface of the rolling member is subjected to heat treatment while nitriding. The rolling member is then treated to form minute recesses in its surface so that such surface has a surface roughness parameter RMS of not less than 0.10 .mu.m and a negative SK value. Thus, the surface strength of the rolling element increases and the oil film forming rate improves. The surface of the rolling member is less likely to suffer peeling damage and wear. Its life is prolonged.