Drum brake

A drum brake for a utility vehicle, comprising:

• a brake drum which is mounted rotatably about a rotational axis;
• a plurality of brake shoes which are mounted in a receiving space of the brake drum, each of the plurality of brake shoes comprising a friction lining carrier and a friction lining arranged on the friction lining carrier,
• wherein the plurality of brake shoes are pressable radially with respect to the rotational axis of the brake drum onto a shell inner surface, configured as a friction surface, of the brake drum;
• a brake cylinder arrangement which is arranged fixedly on an armature housing for conjoint rotation in the receiving space of the brake drum, for actuating the plurality of brake shoes;
• a respective pressure wedge arranged on a side of each friction lining carrier which faces away from the friction lining, the pressure wedge lying on a wedge mechanism which is displaceable parallel to the rotational axis of the brake drum,
• wherein the wedge mechanism is displaceable out of a non-braking position into a braking position by way of displacement of a service brake piston of the brake cylinder arrangement parallel to the rotational axis of the brake drum,
• wherein the brake cylinder arrangement comprises:
• a housing which is fastened to the armature housing in a stationary manner in the receiving space of the brake drum,
• the service brake piston which is displaceable relative to the housing parallel to the rotational axis of the brake drum,
• a parking brake piston which is displaceable relative to the housing parallel to the rotational axis of the brake drum and is loaded with a spring force of a spring element, and
• a plurality of plungers for transmitting a movement of the parking brake piston to the service brake piston,
• wherein respective compressed air feeds into a service brake pressure space are provided between the housing and the service brake piston, and respective compressed air feeds into a parking brake pressure space are provided between the housing and the parking brake piston.