Electro-mechanical brake and vehicle comprising the same

An electro-mechanical brake comprising a pair of brake pads disposed on both sides of a disc, comprising:

• a motor that provides a rotational driving force;
• a rotating screw that rotates about a second rotating shaft parallel to a first rotating shaft of the motor;
• a power transmission unit that transmits the rotational driving force of the motor to the rotating screw;
• a piston that is coupled to the rotating screw to be able to move forward and backward to press the disc with the brake pads;
• and
• a ball nut that is coupled to the rotating screw,
• wherein the power transmission unit includes a first gear coupled to the first rotating shaft of the motor, a second gear coupled to the second rotating shaft of the rotating screw, and a third gear engaging with the first gear and the second gear and rotating about a third rotating shaft spaced apart from a plane including the first rotating shaft and the second rotational shaft,
• the rotating screw includes a first body portion to which the ball nut is coupled, a second body portion formed behind the first body portion and coupled to the second gear, and a third body portion formed between the first body portion and the second body portion,
• the piston is formed in a cup shape with an opening at a rear thereof,
• the ball nut is inserted into the opening of the piston to press the piston forward,
• the first body portion, the third body portion, and the second body portion are formed such that a size of a cross-section perpendicular to a longitudinal direction is sequentially decreased,
• wherein the electro-mechanical brake comprises a supporter that is disposed on an outer peripheral surface of the third body portion and includes a front surface supported on an edge portion of a rear end of the first body portion, and
• an elastic that includes one side coupled to the supporter and the other side coupled to the ball nut to pull the ball nut toward the supporter.