| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device which is formed compact in size and which reduces the drag torque of a motor. <P>SOLUTION: A transmission mechanism 30, a speed reduction mechanism 40, and a drive motor 18 are provided in a hub 10 so as to be arranged side-by-side along an axle 15. The transmission mechanism 30 transmits the drive force of human power to a hub case 11, and the speed reduction mechanism 40 transmits the drive force of the drive motor 18 to the hub case. The transmission mechanism 30 includes a sun gear 30a for a transmission, planetary gears 30b for a transmission, and a planetary carrier 30c for a transmission, and the planetary carrier 30c for a transmission serves as an output member for providing an output to the hub case 11. The speed reduction mechanism 40 includes a sun gear 40a for a speed reducer, planetary gears 40b for a speed reducer, and an outer ring gear 40d for a speed reducer. The planetary gears 40b for a speed reducer are meshed with the outer ring gear 40d for a speed reducer. The planetary carrier 30c for a transmission which holds the planetary gears 40b for a speed reducer serves as an output member for providing an output to the hub case 11. A switching clutch 20 is provided between the outer ring gear 40d for a speed reducer and the motor housing 18b of the drive motor 18. <P>COPYRIGHT: (C)2013,JPO&INPIT |
