a motor driven toy including a transmission mechanism having two output gears each engageable directly with a high speed transmission gear and a low speed transmission gear . one of the output gears is engaged with the high - speed transmission gear for the high - speed low - torque operation , whereas the other output gear is engaged with the low - speed transmission gear for low - speed high - torque operation . the change - over therebetween is well conducted by a tire load transmission cam having a synchronizing gear and a clutch mechanism provided between the synchronizing gear and the other output gear .