Antifriction bearing and process for producing outer race...

Details Antifriction bearing and process for producing outer race... Antifriction bearing and process for producing outer race...

2005-04-05

2005-04-05

Joyce, William C. (Department: 3682)

Bearings

Bearing-surface treatment

C384S492000, C384S569000

Reexamination Certificate

active

06874943

ABSTRACT:
An antifriction bearing comprises an inner race, an outer race having an outer peripheral surface to be brought into contact with other member for use as a roll, and a plurality of rolling elements arranged between the inner and outer races. The portion of the outer race from an outer peripheral surface thereof to a depth of 3 mm has a hardness of 58 to 62 in Rockwell C hardness (hereinafter referred to as “HRC”) and a hardness gradient of up to 1 HRC/1 mm from the outer peripheral surface inward, and contains 5 to 18 vol. % of retained austenite. The portion of the outer race from an inner peripheral surface thereof to a depth of 1 mm has a hardness of 61 to 64 in HRC and contains 5 to 15 vol. % of retained austenite. The center portion of the thickness of the outer race between the inner and outer peripheral surfaces thereof has a hardness of 35 to 42 in HRC. The outer race can be prevented from cracking or breaking and from undergoing plastic deformation due to use for a short period of time.

REFERENCES:
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patent: 6601993 (2003-08-01), Tanaka
patent: 195 24 957 (1997-01-01), None
patent: 1 138 795 (2001-10-01), None
patent: WO 0006790 (2000-02-01), None

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