| 摘要 |
PROBLEM TO BE SOLVED: To easily install an inside roller for forming a spherical surface-shaped recessed part, corresponding to spherical surfaces on the spherical surfaces of trunnions, and to improve lubricity of mutual spherical surfaces which are brought into contact with each other. SOLUTION: Plane parts 36a and 36b, a cutout surface composed of either of a hole part, a recessed part or a wide flat surface or a curved surface part curving in the circumferential direction, is arranged at least in a part of the spherical surfaces 35 of the trunnions 28a (28b, 28c) to which a torque load is not applied.
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