| 摘要 |
PROBLEM TO BE SOLVED: To provide structure sufficiently suppressing a wear volume between outer circumferential faces of a plurality of cylindrical rollers 1 and a mating face and sufficiently securing rolling fatigue lives of the faces. SOLUTION: A condition of 0.7≤X≤0.95 is satisfied, when an axial dimension of each cylindrical roller 1 is L<SB>t</SB>, an axial length of a cylindrical face part formed to the outer circumferential face of teach cylindrical roller 1 is L<SB>s</SB>, an axial dimension of each of crowning parts 15, 15 is L<SB>c</SB>, and an axial dimension of each of chamfered parts 16, 16 is C, and a parameter X=L<SB>s</SB>/(L<SB>t</SB>-2C) is satisfied. By adopting the structure, the above problem is solved. COPYRIGHT: (C)2006,JPO&NCIPI
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