| 摘要 |
PROBLEM TO BE SOLVED: To provide a power transmission device capable of variably controlling rigidity characteristics and viscous characteristics between two pulley members, which transmit power, with a simple structure that makes the deterioration of the drive efficiency less likely to occur.SOLUTION: A power transmission device 1 includes: roller members 13a, 13b, each of which has an outer peripheral part pressure-welded to a wire member 11 tightly stretched between a first pulley member 2 and a second pulley member 3 and may rotate; a rotation gear 16 which may rotate around revolution axes of the roller members 13a, 13b integrally with a support member 14 supporting the roller members 13a, 13b; a spring worm 17 which meshes with the rotation gear 16; and a first actuator 18 which controls an amount of rotations of the spring worm 17. |
