| 摘要 |
PROBLEM TO BE SOLVED: To achieve a structure capable of stabilizing a rolling contact state between outer peripheral surfaces of respective intermediate rollers 27, 27 and an inner peripheral surface of an annular roller 13c and capable of stably obtaining high transmission efficiency while facilitating assembly operation.SOLUTION: Axial-direction intermediate parts of outer peripheral surfaces of respective intermediate rollers 27, 27 are formed as cylindrical surfaces 28 in which an outer diameter is not changed in an axial direction. Protrusions 30a, 30a are formed on two positions separated in the axial direction out of an inner peripheral surface of an annular roller 13c respectively over the whole peripheries. The outer peripheral surfaces of the respective intermediate rollers 27, 27 and the inner peripheral surface 13c of the annular roller are brought into roll contact with each other in each two positions separated in the axial direction in each of the intermediate rollers 27, 27. |
