| 摘要 |
PURPOSE:To enable the reduction ratio to be changeable, in the structural part in which an internal gear is turned in the opposite direction to a sun gear, by providing the first and the second gears which are changeably provided on an input shaft and an intermediate transmission shaft respectively, and the third gear provided on the intermediate transmission shaft and the fourth gear engaging therewith. CONSTITUTION:A sun gear 2 is directly driven by a motor via an input shaft 1. On the other hand, an internal gear 3 is turned in the opposite direction to the motor output shaft via the second gear 9 and the third gear 11 being integrally fitted on one shaft and being the intermediate gears between the first gear 8 and the fourth gear 12. Thus, the revolution of planetary gears 4 is caused by the differential motion of the sun gear 2 and the internal gear 3, and since the first gear 8 and the second gear 9 are changeable, if later the necessity arises, the reduction ratio can be changed by changing gears.
|
