Multi-speed transmission for motor

A transmission for a motor comprising:

• an input shaft rotating by driving force transmitted from the motor;
• a plurality of driving gears having the input shaft in the middle of the driving gears and being different in the number of gear teeth;
• a plurality of driven gears which are externally meshed with the driving gears and are different in the number of gear teeth;
• an output shaft being parallel with the input shaft, serving as a central shaft of the driven gears, and outputting rotary speed changed in speed by the driving gears and the driven gears;
• a plurality of pawls disposed on the input shaft or the output shaft to protrude or retract from the outer circumferential surface;
• and
• a controller for controlling protrusion and retraction of the pawls,
• wherein the controller comprises:
• a plurality of shifting bars each of which one end is combined with the pawl and the other end has a protrusion part, which protrudes or retracts from the outer circumferential surface of the input shaft or the output shaft;
• an elastic member for elastically supporting lower portions of the pawl or the protrusion part.