Rolling bearing

Details Rolling bearing Rolling bearing

1994-02-28

1995-08-08

Footland, Lenard A.

Bearings

Bearing-surface treatment

384492, 384912, F16C 1900

Patent

active

054393000

ABSTRACT:
An object of this invention is to provide a rolling bearing having an inner race which can be used under a high fitting stress over 130 MPa, and can be processed more quickly than the conventional one. In a rolling bearing, according to the present invention, including an inner race which is used with a fitting stress applied between bore of said inner race and shaft, the inner race is formed by an alloy steel whose carbon content is ranged from 0.3 to 0.7% by weight, the inner race is subjected to a carburizing or carbonitriding treatment, and the carbon content (C.sub.1) of the surface layer of the raceway track of the inner race is at most 1.3% by weight, and the inner race has the difference (.DELTA.C=C.sub.1 -C.sub.2) between the carbon content (C.sub.1) of the surface layer and the carbon content (C.sub.2) of the core of the inner race being at least 0.4% by weight. When the amount of residual austenite of the inner race is 4.0 vol % or less and the hardness of the raceway track is Hv 720 or more, the inner race is high in dimensional stability, and its life-time with a foreign-matter-mixed high-temperature lubricant is increased.

REFERENCES:
patent: 5137375 (1992-08-01), Murakami et al.
patent: 5261975 (1993-11-01), Sorstrom et al.
patent: 5292200 (1994-03-01), Matsumoto et al.
patent: 5352303 (1994-10-01), Murakami et al.
HTM 47 (1992) 4, pp. 223-230.

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