PROBLEM TO BE SOLVED: To provide a pulley capable of suppressing occurrence of unnecessary torque, and reducing its size and weight.SOLUTION: A pulley P1 includes: a first guide raceway part 1a partially surrounding an oscillation axial line O, and configured to guide a first flexible transfer element 2a； and a second guide raceway part 1b at least partially surrounding the oscillation axial line O on the inside in a radial direction of the first guide raceway part 1a, and configured to guide a second flexible transfer element 2b. The first and second guide raceway parts 1a, 1b are arranged so as to overlap with each other in a direction along the oscillation axial line O.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】不要なトルクの発生を抑制すると共に、小型化、軽量化を可能にできるプーリを提供する。【解決手段】本発明のプーリＰ１は、揺動軸線Ｏを部分的に取り囲み、第１の柔軟伝達要素２ａを案内する第１の案内軌道部１ａと、第１の案内軌道部１ａの径方向内側で揺動軸線Ｏを少なくとも部分的に取り囲み、第２の柔軟伝達要素２ｂを案内する第２の案内軌道部１ｂと、を備え、第１及び第２の案内軌道部１ａ、１ｂは、揺動軸線Ｏに沿う方向において、互いに重複するように配置されている。【選択図】図１
