Electronic parking brake

Abstract

Disclosed herein is an electronic parking brake. According to one embodiment of the present invention, the electronic parking brake which includes a carrier in which a pair of pad plates disposed to press a disc rotated together with a wheel of a vehicle is installed to be moved forward and backward, a caliper housing slidably installed at the carrier and having a cylinder in which a piston is installed to be moved forward and backward by a braking hydraulic pressure, a motor disposed at an outer side of the caliper housing to generate a rotational force in forward and reverse directions, a conversion unit configured to convert the rotational force of the motor into a linearly reciprocating motion and transmit the converted force to the piston, and a decelerator disposed between the motor and the conversion unit and configured to decelerate the rotational force of the motor and transmit the decelerated rotational force to the conversion unit, includes an adaptor coupled with a rotational shaft of the motor and connected with an output gear of the decelerator, wherein the rotational shaft and an output shaft of the output gear are coaxially connected in series through the adaptor, and the output gear is supported by the adaptor to prevent shaking when being rotated.