| 摘要 |
An exercise-aid device comprises a base, a transmission mechanism, and a pair of cranks. The transmission mechanism comprises a motor, a first shaft, and a second shaft. The motor includes an output shaft with a worm. A drive gear is mounted on the first shaft and meshes with the worm. A follower gear is fixed to a side of the drive gear to turn therewith. A driven gear is mounted on the second shaft and meshes with the follower gear. Each crank has a pedal mounted thereto and is securely attached to an end of the second shaft to turn therewith. The worm and the drive gear provide a first-stage reduction. The follower gear and the driven gear provide a second-stage reduction, thereby providing a torque sufficiently high for driving said pedals to turn even if two feet of a user are placed on the pedals.
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