FRICTION TRANSMISSION DEVICE

To provide a friction transmission device capable of reducing surface pressure.SOLUTION: A friction transmission device 100 comprises: an input bearing ring 14; a planetary rolling element 20 arranged around a rotational axial line of the input bearing ring 14, and in contact with the input bearing ring 14; an output bearing ring 30 that is in contact with the planetary rolling elements 20, and is connected to an output member 32; and a first support bearing ring 26 and a second support bearing ring 28 that are in contact with the planetary rolling elements 20. At least one of the input bearing ring 14, the output bearing ring 30, the first support bearing ring 26 and the second support bearing ring 28 is a convex-concave contact bearing ring that is in concave-concave contact with the planetary rolling elements 20.SELECTED DRAWING: Figure 2 【課題】本発明の目的は、面圧を低くすることが可能な摩擦伝動装置を提供することである。【解決手段】摩擦伝動装置１００は、入力軌道輪１４と、入力軌道輪１４の回転軸線周りに配置され入力軌道輪１４に接触する遊星転動体２０と、遊星転動体２０と接触し出力部材３２と連結される出力軌道輪３０と、遊星転動体２０に接触する第１支持軌道輪２６および第２支持軌道輪２８と、を備えた摩擦伝動装置であって、入力軌道輪１４、出力軌道輪３０、第１支持軌道輪２６および第２支持軌道輪２８のうち少なくとも一つは、遊星転動体２０と凸凹接触する凸凹接触軌道輪である。【選択図】図２