Drum brake type electric parking brake apparatus

A drum brake electric parking brake apparatus comprising:

• a knuckle, configured to perform as a suspension of a vehicle, formed with a concave portion at an inner-side surface thereof;
• a backing plate, supported and fixed to the knuckle;
• a pair of brake shoes, supported to an outer-side surface of the backing plate, and configured to be displaced in a direction in which the brake shoes are separated from each other;
• a drum, provided to surround the brake shoes, and configured to rotate together with a wheel that is rotatably supported to an outer-side surface of the knuckle;
• an anchor, fixed between one end portions of the brake shoes in a circumferential direction of the drum at a part of the outer-side surface of the backing plate, and configured to receive a brake torque applied to the brake shoes due to a friction between linings of the brake shoes and an inner circumferential surface of the drum;
• and
• an electric actuator unit, including an electric motor and a decelerator, and configured to expand a gap between the one end portions of the brake shoes based on activation of the electric motor, wherein
• the electric actuator unit is supported and fixed to the inner-side surface of the knuckle and the knuckle is entirely arranged at an inner-side surface of the backing plate such that the electric actuator unit is not directly fixed to the backing plate,
• the backing plate and the knuckle are formed with respective first through holes through which a fixing member is inserted to fix the backing plate to the knuckle, and
• the first through holes are disposed at a bottom surface of the concave portion.