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. 19, 1999
Filed:
Oct. 17, 1995
Kiyoshi Hirakawa, Kanagawa, JP;
Akihiro Kiuchi, Kanagawa, JP;
NSK Ltd., Tokyo, JP;
Abstract
In a rolling bearing comprising at least one member of an inner race and a shaft, the member having an inner raceway on an outer circumference, an outer race having an outer raceway on an inner circumference, and a plurality of rolling elements interposed rollingly between the inner raceway and the outer raceway, the member having raceways or rolling elements are formed of a steel containing 5-18 wt% of Cr, 0.5-1.2 wt% of C and the balance being Fe. The steel is tempered at a temperature for secondary hardening or subjected to shot peening after low-temperature tempering, so that its hardness is increased to H.sub.2 C 57 or more. At the same time, the amount of retained austenite in the steel is reduced to 6 vol% or less. As a result, the impression resistance of the raceways is sufficiently improved to insure that there is no deterioration in acoustic characteristics due to indentation. In addition, the fatigue life and wear resistance of the bearing are improved.