Patent attributes
An electric brake assembly includes an electric motor having a rotor in which a nut of a ball screw is fitted. A brake pad is coupled through a presser member to the threaded shaft of the ball screw. A bolt is threaded into the threaded shaft. A snap ring is mounted around a large-diameter portion of the bolt with its radially outer edge pressed against the radially inner surface of the rotor of the motor so that its radially outer portion is inclined obliquely rearwardly toward its radially outer edge. When the rotor is rotated in the forward rotational direction, the threaded shaft can move forwardly to press the brake pads against the disc rotor. When the motor is deactivated, the threaded shaft cannot retract after it has abutted the snap ring because the snap ring cannot move rearwardly relative to the rotor.
