Electric drum brake system having a rationalized electric parking brake actuator

An electric drum brake system with a parking brake actuator for a motor vehicle, wherein the parking brake actuator is arranged on an outer side of an anchor plate and, in a state of rotational drive, drives a drive nut which is supported rotatably and axially fixedly on the anchor plate, which drive nut drives a spindle, which is mounted in a rotationally secured and axially displaceable manner in a gearing housing, of a spindle arrangement, which spindle engages by an actuation cable on at least one brake shoe such that the latter can perform an actuation movement in a direction of a brake drum or can perform a release movement in an opposite direction, and having at least one electrical interface for an electrical human-machine interface and/or for an electronic control unit, wherein an axis A1 along a motor shaft of the motor with a helical wheel pinion coupled rotationally conjointly to the free motor shaft end and an axis A2 of the spindle arrangement including helical wheel coupled rotationally conjointly to the drive nut are arranged approximately at right angles with respect to one another and, with an axis spacing X with respect to one another, define a helical-wheel gearing stage of the parking brake actuator, and wherein the gearing housing comprises a gearing housing lower shell and a gearing housing cover, the gearing housing lower shell formed from a continuous piece which (i) includes the at least one electrical interface;

• (ii) accommodates the motor, motor shaft, and spindle arrangement;
• and (iii) defines the axis spacing X between axis A1 and axis A2.