Electric power steering apparatus using coated pulley

The present invention relates to an electric power steering apparatus using a coated pulley. According to the present invention, an electric power steering apparatus using a coated pulley, comprising a pinion shaft (9) coupled to a shaft (3) of a steering wheel and having teeth formed on the pinion shaft; a rack shaft (23) having teeth formed in one end thereof and a ball screw formed in the other end thereof, the teeth of the rack shaft (23) being meshed with the teeth of the pinion shaft (9); a ball nut (51) provided in the ball screw through a plurality of balls interposed between the ball nut and the ball screw; a first pulley (39) coupled to the ball nut (51) to cooperate therewith; a torque sensor for sensing a torque generated from the steering wheel; an electric motor (35) for generating a steering assisting force according to a signal from the torque sensor; a second pulley (37) installed to one end of the electric motor (35); and a belt (41) connecting the first pulley (39) and the second pulley (41) to each other to transmit the steering assisting force generated from the electric motor (35) to the ball nut, wherein the first (39) or second pulley (41) has a coating layer formed on an outer surface thereof.