Importance

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Abstract

The present invention provides a transmission unit that can realize a high speed-shifting ratio, can realize reduced size, low cost and low noise, and is also capable of limiting slip loss. Outer peripheral surfaces of a small diameter rolling element and a supplementary rolling element are brought into contact with an outer peripheral surface of a large diameter rolling element. The supplementary rolling element is arranged at an almost opposite side to the small diameter rolling element, thus enclosing the large diameter rolling element between the small diameter rolling element and the supplementary rolling element. An inner peripheral surface of the pressure adjustment ring is brought into contact with the outer peripheral surface of the small diameter rolling element and the outer peripheral surface of the supplementary rolling element, and is supported by them. If the small diameter rolling element rotates, the pressure adjustment ring rotates by means of the large diameter rolling element and the supplementary rolling element. If load is applied to rotation of the large diameter rolling element, the pressure adjustment ring is made eccentric. In this way, the small diameter rolling element receives pressing force toward an inner side in the radial direction of the large diameter rolling element, from the pressure adjustment ring.

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First Claim