Electric brake caliper

A brake caliper comprising:

• a caliper housing including a rotor channel adapted to receive a rotor therein, the rotor channel having a first axial surface adapted to seat a first brake pad thereon;
• a piston assembly mounted to the housing on an axial side of the rotor channel opposite that of the first brake pad, the piston assembly including,
• a piston nut, reciprocatable towards and away from the rotor channel, the piston nut adapted to seat a second brake pad thereon,
• a cylindrical screw threaded into the piston nut, the screw including a coaxial, cylindrical bore extending therein, and
• a planetary gear train positioned within the cylindrical bore of the screw, the planetary gear train including a motor-driven, central sun gear, at least one coaxial tube ring gear and at least one planetary pinion operatively engaged between the sun gear and the tube ring gear and carried on a revolving carrier, the revolving carrier including an output shaft extending therefrom, coaxial with, and coupled to the screw;
• and
• a retaining flange extending radially inwardly from a longitudinal end of the piston nut approximate the second brake pad, the retaining flange preventing the cylindrical screw from traveling axially beyond a predefined point, thereby protecting the second brake pad from damage caused by the cylindrical screw contacting the second brake pad.

A brake caliper comprising:

• a caliper housing including a rotor channel adapted to receive a rotor therein, the rotor channel having a first axial surface adapted to seat a first brake pad thereon;
• and
• a piston assembly mounted to the housing on an axial side of the rotor channel opposite that of the first brake pad, the piston assembly including,
• a piston nut, reciprocatable towards and away from the rotor channel, the piston nut adapted to seat a second brake pad thereon,
• a cylindrical screw threaded into the piston nut, the screw including a coaxial, cylindrical bore extending therein, and
• a planetary gear train positioned within the cylindrical bore of the screw, the planetary gear train including, (a) a first motor-driven, sun gear, (b) a tube ring gear coaxial with the first sun gear, (c) a first-stage planetary pinion engaged between the first sun gear and the tube ring gear, (d) a revolving stage separator coaxial with the first sun gear and carrying the first planetary pinion for rotation on a radially distal rotational axis, the stage separator including a second sun gear extending therefrom, the second sun gear being coaxial with the motor-driven sun gear, (e) a second planetary pinion engaged between the second sun gear and the tube ring gear, and (f) a revolving carrier coaxial with the first and second sun gears and carrying the second planetary pinion for rotation on a radially distal rotational axis, the carrier including a drive shaft extending therefrom, coaxial with the first and second sun gears, the drive shaft being coaxially coupled to the cylindrical screw.