| 摘要 |
PROBLEM TO BE SOLVED: To enhance the assembling property of an inner roller with a tripod shaft part. SOLUTION: An outer peripheral surface 22a of the tripod shaft part 22 is formed in a circular projection shape in a radial cross section of a boss part 21. In the inner roller 32, the maximum inner diameter D1 is set larger than a diameter d1 of the maximum circumscribed circle of the tripod shaft part 22, and an axial cross section shape of the inner peripheral surface 32a is formed in a circular recession shape. It is relatively rotatable relative to an outer roller 31 and is coaxially arranged at an inner side in a radial direction of the outer roller 31, and axial movement relative to the outer roller 31 is restricted. Further, the diameter d1 of the maximum circumscribed circle of the tripod shaft part 22, width w1 at an axial side of the boss part 21 in an elongation perpendicular cross section of the tripod shaft part 22, and one opening diameter D2 of the inner roller 32 satisfy a relationship of formula (1). COPYRIGHT: (C)2009,JPO&INPIT
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