| 摘要 |
In an automatic torque-switching apparatus ( 1 ), a fixed member ( 12 ) of a reduction device ( 8 ) is attached to an apparatus housing ( 2 ) via a one-way clutch ( 9 ) so as to not rotate in the direction of torque acting on the fixed member from the load side. A rotational input member ( 13 ) of the reduction device ( 8 ) and the fixed member ( 12 ) of the reduction device are linked via a torque limiter ( 10 ) so as to rotate integrally only when the torque acting on the fixed member ( 12 ) is less than or equal to a prescribed value. The speed reducing operation is not performed while the torque is less than or equal to the prescribed value, and the rotation of a motor ( 3 ) is output directly. When the torque exceeds the prescribed value, the reducing operation is performed, and a switch is automatically made to a rotational output having reduced speed and a large torque. An automatic torque-switching apparatus can be realized that has a small-sized, compact structure capable of reversibly switching from a state in which high-speed rotation is output directly to a state in which high-torque, low-speed rotation is output via a reduction device in accordance with the required torque.
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