Actuator of electric parking brake for automotive vehicle

The present invention relates to an actuator for automotive electronic parking brake apparatus which generates a power for canceling the state pulled or drawn parking cable when it take a parking brake or release the automotive electronic parking brake system that is configured to work with the power of the electric motor will be. Actuator for automotive electronic parking brake apparatus according to the present invention comprises an electric motor (1); A lead screw (5) rotated by the electric motor; Is screwed on the lead screw in the rotation is constrained state equalizer (6) to turn off while moving in rotation in the axial direction of the parking brake cable 7 is pulled or the pulling state of the lead screw; And constraining means for constraining releasably to the parking brake cable is pulled by the equalizer; made, including, this actuator locking mechanism Paul - the brackets mechanism noise is very small and the configuration is simple according to baejedoem and operation easy. Further, the lead angle control of the lead screw down the power efficiency of the operation reaction speed is very quick increase when increasing the lead angle of the lead screw.