| 摘要 |
PROBLEM TO BE SOLVED: To provide an antifriction bearing with excellent acoustic performance and rotatability as well as good fretting resistance at low cost. SOLUTION: A deep groove ball bearing 1 includes an outer ring 2, an inner ring 3 and a plurality of balls 4 as rolling elements arranged between the outer ring 2 and the inner ring 3 in such a manner that they can roll freely. The outer ring 2 and the inner ring 3 are formed of high-carbon chromium bearing-steel. The balls 4 are formed of martensitic stainless steel in which the size of eutectic carbide is 10μm or less, and the sphericity of the balls is 25nm or less and the surface roughness thereof is 4nmRa or less. COPYRIGHT: (C)2006,JPO&NCIPI
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