| 摘要 |
<p>A speed change device comprises two electric motors 1,2 which can be individually actuated by an electric control means adapted to receive a radio signal from a remote place, and a differential gear mechanism 3 or a planetary gear mechanism which transmits the revolving force to a drive means, one motor only being actuated to provide a first speed and both motors together to provide a second speed. Further, this speed change device comprises a revolution preventing means for preventing an idling revolution of the non-actuated motor by the revolving force owing to the actuated motor. The gearing may be used in a ratio-controlled toy vehicle. <IMAGE></p> |
