Electric disc brake

An electric disc brake comprising:

• a caliper housing configured to include a cylinder at which a piston is installed to be reciprocally movable by a brake hydraulic pressure;
• an adjuster arranged inside the piston;
• a pushrod provided inside the cylinder;
• an actuator configured to decelerate a rotational force according to an activation of a motor to output the decelerated rotational force and configured to pressurize the piston;
• and
• a ramp unit installed inside the cylinder, the ramp unit configured to receive the decelerated rotational force from the actuator to pressurize the pushrod toward the piston and prevent rotation of the pushrod,
• wherein the actuator includes an output gear rotatably connected to the motor,
• wherein the electric disc brake further comprises a connector configured to deliver the decelerated rotational force of the output gear to the ramp unit in one direction,
• wherein the connector and the output gear deliver the rotational force of the motor when the motor is activated in a direction pressurizing the piston, and do not deliver the rotational force of the motor when the motor is activated in a direction not pressurizing the piston, and
• wherein at least one protrusion spaced apart from a center of the output gear in a radial direction by a predetermined distance is formed at one lateral surface of the output gear, the connector is rotatably installed at the center of the output gear to be coupled to a rotating ramp plate of the ramp unit, and a supporting unit is provided in a circumferential direction at which the at least one protrusion is rotated so as to receive the rotational force through the protrusion formed at the output gear.