| 摘要 |
PROBLEM TO BE SOLVED: To provide lightweight small-sized driving gears by forming one of parallel shafts as an input shaft, and carrying a ring gear on an output shaft by a method of floating a distance reaching teeth from the pinion axis so as to change the distance. SOLUTION: Flexibility is imparted to an annular wall 13 of a ring gear 12 so that the peripheral part carrying teeth 14, 15 can float in the direction for crossing the extension. The opening part 26 is arranged here so as to increase flexibility of the wall 13. A shaft 17 is through as an input shaft of motion. That is, this shaft is driven by a motor, and a shaft 10 such as a motive power taking-out shaft exists on the downstream of driving gears. Since both pinions 16, 25 are driven through the driving gears 20, 21, the whole torque applied to the shaft 17 is distributed to these two pinions. The distribution of the torque is secured when crown gears 14, 15 approach or separate from the pinions since the annular wall 13 is flexible. |
