| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve rolling fatigue life of a rolling bearing, which is used under conditions where structure changing type peeling is likely to occur, such as a bearing for a wind turbine and a bearing for a construction machine. <P>SOLUTION: An inner ring 1 is formed by using material, which is alloy steel containing 0.10-0.30 mass% C, 0.20-0.50 mass% Si, 0.20-1.20 mass% Mn, 2.6-4.5 mass% Cr, 0.10-0.40 mass% Mo, 0.20 mass% or less Ni and Cu, 0.02 mass% or less S, 0.02 mass% or less P, and 12 ppm or less O, and contains oxide inclusion with a diameter 10μm or more of 10 pieces/320 mm<SP POS="POST">2</SP>, and by carburizing or carbonitriding, and quenching and tempering. In a 1%D position of a raceway surface, C+N is 0.8-1.2 mass%, Hv is 720-830, a residual austenite amount is 20-40 vol%, a compression residual stress is 50-200 MPa, surface roughness is 1.0μm or less at a maximum peak height (Rp) of a roughness curve, and hardness of a core part is Hv 400-550. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
