| 摘要 |
An exercise-aid device comprises a base, a transmission mechanism, and a pair of cranks. The transmission mechanism comprises a motor, 21, a first shaft, 25, and a second shaft 26. The motor includes an output shaft with a worm 211. A drive gear 22 is mounted on the first shaft 25 and meshes with the worm 211. A follower gear 23 is fixed to a side of the drive gear 22 to turn therewith. A driven gear 24 is mounted on the second shaft 26 and meshes with the follower gear, 23. Each crank has a pedal 31 mounted thereto and is securely attached to an end of the second shaft 26 to turn therewith. The worm 211 and the drive gear 22 provide a first-stage reduction. The follower gear 23 and the driven gear 24 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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