| 摘要 |
In a power roller for a toroidal continuously variable transmission, temperature rise of a power transmission part can be prevented by suppressing the heat in a rolling contact part between a ball and an inner race groove. By setting a radius of curvature of an inner race groove less than a radius of curvature of an outer race groove, a Hertzian contact area between the inner race groove and the ball is set larger than a Hertzian contact area between the outer race groove and the ball. Further, the pitch diameter of the inner race groove is set to be less than the pitch diameter of the outer race groove. By doing so, the direction of the rotation axis of the ball can be set to a direction wherein the spin of the inner race is less than the spin of the outer race.
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