| 摘要 |
PROBLEM TO BE SOLVED: To secure a long durbility life even under a foreign matter mixing condition. SOLUTION: Carbonitriding layers 11a, 15a, and 16a with the carbon content not less than 0.80 wt.%, the Lockwell hardness not less than HRC 58, and the recidual austenite amount 25 to 35 vol.%, are formed on the part surfaces of an outer ring 11, an inner ring 15, and a tapered roller 16, which are formed of carbulized bearing steel of the oxigen content not more than 9 ppm, and the carbionitriding layer on the part surfaces is maintained in a material with an adequate toughness stably, as well as the mechanical property and the fatigue characteristic of the parts are improved, and the durability life of a tapered roller bearing 6 under a foreign matter mixing condition is improved extensively.
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