Patent ID: 8312974

Claim:
A disc brake for a vehicle, comprising a disc rotated along with wheels of the vehicle, an inner friction pad and an outer friction pad disposed at both sides of the disc, a caliper housing supporting the outer friction pad, a wedge member disposed at a rear side of the inner friction pad and formed with inclined surfaces on a rear surface thereof, a supporting member formed with inclined surfaces corresponding to the inclined surfaces of the wedge member and fixed to the caliper housing, and a driving unit operating the wedge member to perform a braking operation, wherein the driving unit comprises: a screw axis mounted to the supporting member and extended in a rotating direction of the disc; a driving motor mounted to the supporting member to drive the screw axis, in a manner that a shaft thereof is mounted in a direction across the screw axis and a pressing direction of the inner friction pad; a worm gear constituted by a worm formed at the shaft of the driving motor and a worm wheel mounted to the screw axis to be engaged with the worm; and a moving member connected to the screw axis and moved by rotation of the screw axis, thereby pressing the wedge member in a rotating direction of the disc.