| 摘要 |
PROBLEM TO BE SOLVED: To provide long-service-life structure, by suppressing abrasion of an outer circumferential face of an intermediate part of a roller support shaft 9 even in lubricating environment using lubricating oil into which insoluble components such as soot or the like are mixed. SOLUTION: The roller support shaft 9 is made of iron alloy containing, in total, 1.0 to 20.0 wt.% of Cr, Mo, V, and W, and containing, in total, 0.5 to 1.2 wt.% of C and N. After nitriding a surface, induction hardening is performed on needles 13, and the outer circumferential face of the intermediate portion in rolling-contact with the needles 13. Hardness of the outer circumferential face of the intermediate portion is enhanced by the constitution, resulting in solving the above problem. COPYRIGHT: (C)2004,JPO&NCIPI
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