Patent ID: 8490515

Claim:
A transmission for a motor comprising: a driving shaft that has a polygonal outer circumference; and a ball-mounting ring coupled to the outer circumference, the ball-mounting ring including a constant speed ball and a speed changing ball spaced apart from each other by a predetermined distance so that upper and lower sides of them protrude, and the ball-mounting ring frictionally fixed by a friction pin to give friction force to the ball-mounting such that the ball-mounting ring does not return or run idle, whereby at least one of the constant speed ball and the speed changing ball escapes from the outer circumference according to a rotation direction of the driving shaft, thereby the transmission gives a normal rotation and constant speed output to an output cover when the driving shaft of the motor rotates in a normal direction and a normal rotation and speed-changed output to the output cover when the driving shaft of the motor rotates in a reverse direction.