|発明の名称||POWER TRANSMISSION DEVICE AND MACHINING DEVICE IN ORAL CAVITY|
PROBLEM TO BE SOLVED: To provide a power transmission device that can be implemented small though backlash is reduced, and relative displacement due to torque is hard to occur in a gear.
SOLUTION: A flexibility rotary shaft 20 for supporting a worm 10A is held in a state having flexure by a first bearing member 51 and a second bearing member 52. The worm 10A is pushed to a worm wheel 30A by the restoring force of the flexibility rotary shaft 20. The first bearing member 51 prevents the relative displacement in the in-plane direction parallel to the α γ plane being perpendicular to the length direction of the flexibility rotary shaft 20 in a first holding portion 21 of the first holding portion 21 of the flexibility rotary shaft 20. The second bearing member 52 prevents the relative displacement of the intersecting direction intersecting in the α β plane parallel to the length direction of the flexibility rotary shaft 20 in the first holding portion 21 and the direction where the worm 10A is forced on a worm wheel 30A of the second holding portion 22 of the flexibility rotary shaft 20.
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