Back-clearance-free servo brake

The utility model discloses a non-backlash servo brake which comprises a coil body shell, an inner hexagon screw is installed on the edge of the coil body shell in the axial direction of the coil body shell, and a bottom plate is installed at the end, extending out of the coil body shell, of the inner hexagon screw in the direction parallel to the end face of the coil body shell. The sleeve is sleeved on the inner hexagonal screw along the axial direction, and two ends of the sleeve respectively abut against the opposite side surfaces of the coil body shell and the bottom plate; the armature plate is slidably arranged outside the sleeve in a sleeving mode, the shaft sleeve is arranged in a cavity in the center of the bottom plate in a penetrating mode, the front end of the shaft sleeve extends to the position between the armature plate and the bottom plate in the axial direction, and the two brake pads are fixed to the edge positions of the two side faces of the brake iron plate respectively; the brake iron p