| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive roller bearing which has an excellent acoustic performance, suppressing degradation in life of a race ring. SOLUTION: A rolling element 3 of a deep-groove ball bearing comprises an alloy steel that contains carbon by 0.7-1.3 mass%, chromium by 0.3-2 mass%, silicon by 0.1-1.5 mass%, manganese by 0.1-1.5 mass%, and oxygen 12 ppm or less, with a remaining portion consisting of iron and inevitable impurity. The alloy steel is molded into a prescribed form, and then hardened, annealed, and peened. The rolling element 3 which is thus manufactured is applied with a remaining compression stress of 1,000 MPa or larger from a surface to a surface layer part, up to the depth of 1% of diameter. The Vickers hardness at the surface of the rolling element 3 is 850 or higher, and the remaining austenite amount at the surface of rolling element 3 is more than 0 to less than 10 in vol.%. COPYRIGHT: (C)2006,JPO&NCIPI
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