Bearings – Rotary bearing – Antifriction bearing
Patent
1995-10-17
1999-01-19
Footland, Lenard A.
Bearings
Rotary bearing
Antifriction bearing
384565, 384569, 384625, 384912, F16C 1908
Patent
active
058607498
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.
REFERENCES:
patent: 5084116 (1992-01-01), Mitamura
patent: 5085733 (1992-02-01), Mitamura
patent: 5352303 (1994-10-01), Murakami et al.
"JIS Handbook 1990 Ferrous Materials and Metallurgy", pp. 15, 17, 1963, 2317, published by the Japanese Standards Association, 1990.
Hirakawa Kiyoshi
Kiuchi Akihiro
Footland Lenard A.
NSK Ltd.
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