| 摘要 |
PROBLEM TO BE SOLVED: To prolong the life of a rolling bearing for a belt type continuously variable transmission by effectively preventing premature peeling resulting from hydrogen produced by tribochemical reaction. SOLUTION: A surface layer part forming the raceway surface of a raceway ring or the rolling surfaces of rolling elements is formed as follows. The hardness is HRC 60 (Rockwell C hardness) or higher, a residual austenite amount is 15 to 45 vol.%, and a constant (K calculated by an equation (1) below) indicating the decomposing rate of residual austenite when it is held at a specified temperature for a specified time is 0.003 or below at the holding temperature of 170°C. (1) Equation: K=-In (γR<SB>t</SB>/γR<SB>0</SB>)/t, where t is the holding time at the specified temperature,γRt is a residual austenite amount (vol.%) after a time t<SB>i</SB>is passed, andγR<SB>0</SB>is a residual austenite amount (vol.%) at t=0. COPYRIGHT: (C)2005,JPO&NCIPI
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