FRICTION TRANSMISSION DEVICE

To provide a friction transmission device which can apply more stable pressing force.SOLUTION: A friction transmission device 100 of an embodiment includes: a planetary rolling element 20 disposed around a rotary shaft; a first bearing ring 30 and a second bearing ring 28 which contact with the planetary rolling element 20; and a pressing force application mechanism 7 which presses the second bearing ring 28 to generate a pressing force to a contact surface between the second bearing ring 28 and the planetary rolling element 20. A first bearing ring support part 36 which supports the first bearing ring 30 at the opposite side of the planetary rolling element 20, a contact surface 20d between the first bearing ring 30 and the planetary rolling element 20, a contact surface 20c between the second bearing ring 28 and the planetary rolling element 20, and a contact surface between the pressing force application mechanism 7 and the second bearing ring 28 overlap when viewed from an axial direction.SELECTED DRAWING: Figure 2 【課題】本発明の目的は、より安定した押付力を付与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】ある態様の摩擦伝動装置１００は、回転軸周りに配置される遊星転動体２０と、遊星転動体２０に接触する第１軌道輪３０および第２軌道輪２８と、を備えた摩擦伝動装置であって、第２軌道輪２８を押し付けて第２軌道輪２８と遊星転動体２０との接触面に押付力を発生させる押付力付与機構７を備える。第１軌道輪３０を遊星転動体２０とは反対側で支持する第１軌道輪支持部３６と、軸方向から見て、第１軌道輪３０と遊星転動体２０との接触面２０ｄと、第２軌道輪２８と遊星転動体２０との接触面２０ｃと、押付力付与機構７と第２軌道輪２８の接触面が重なる。【選択図】図２