| 摘要 |
PROBLEM TO BE SOLVED: To easily install trunnions and an annular member without being influenced by installing directionality, and to improve lubricity of mutual spherical surfaces for contacting with each other. SOLUTION: A set of cutout surfaces 36a and 36b are arranged by cutting out a part of the mutually opposing spherical surfaces 35 of the trunnions 28a, 28b and 28c, to which a torque load is not applied, and an opening part 52 of an inside roller 40 installed on the trunnions 28a to 28c is formed into a true circle shape, so that the trunnions 28a to 28c and the inside roller 40 can be installed easily, without being limited by the installing direction at installing time.
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