Patent ID: 8292042

Claim:
An electric disc brake, comprising: friction pads for pressing a disc: a carrier for supporting the friction pads; a caliper housing supported by the carrier such that the caliper housing moves back and forth to press the friction pads; and a pressing device for pressing the friction pads, wherein the pressing device includes: a pressing member moving back and forth in the caliper housing to press one of the friction pads; a screw shaft coupled to the pressing member; a worm wheel coupled to the screw shaft; a driving shaft crossing the screw shaft and having a worm gear engaged with the worm wheel; a motor for rotating the driving shaft in a forward direction or a reverse direction; and an auxiliary pressing device, wherein the auxiliary pressing device includes: a first gear fitted around the driving shaft; a second gear engaged with the first gear; an auxiliary motor; a third gear fitted around a shaft of the auxiliary motor; and a third gear shaft coupled to the third gear, wherein the second gear is coupled to the third gear shaft.