ACTUATING DEVICE FOR A MULTI-PLATE BRAKE, AND TRANSMISSION ARRANGEMENT COMPRISING THE ACTUATING DEVICE AND THE MULTI-PLATE BRAKE

Actuating devices are known which have a piston which can be acted on by a fluid pressure for the purposes of actuating a multi-plate brake. A problem addressed by the invention is that of creating an actuating device which is distinguished by a compact construction. For this purpose, an actuating device (40) with an actuating piston (41) for transmitting an actuating force F1 to a multi-plate device (20), with a housing section 3, wherein the actuating piston (41) is received in the housing section 3 so as to be axially displaceable between an open and a closed position O, S, wherein the housing section (3) has a pressure chamber (43), wherein the actuating piston (41) delimits the pressure chamber (43) such that, in the case of an increase of a fluid pressure in the pressure chamber, the actuating piston (41) is transferred from the open into the closed position O, S, with a spring device (42) for resetting the actuating piston (41) from the closed into the open position S, O, wherein the spring device (42)