Ball bearing
AssigneeKoyo Seiko Co., Ltd.
InventorsKiyoshi Tanimoto, Shinji Abe
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Abstract
A rolling bearing composed of a combination of bearing wings formed with a steel material and rolling elements formed with a ceramic material, wherein the residual austenite amount of the steel material forming the rolling rings is controlled to a specific value. By the construction, at rolling of the rolling elements formed with a relatively hard ceramic material, the occurrence of the surface scratches of the rolling elements can be restrained, which results in restraining the vibrations and noises caused from the rolling bearing.
Claims3
A rolling bearing comprising a bearing ring made of a steel material and a plurality of balls made of a ceramic material, wherein the amount of austenite remaining in the steel material for forming the bearing ring is set to be in range of 0.05% to 6%, and the ceramic balls have a diameter of 2 mm and a precision of at least the requirements of JIS Standard B1501-G3 related to steel balls.
Dependencies are inferred from the claim text.