Adjusting drive

An adjusting drive, comprising an electric motor having a motor armature provided with a motor armature shaft;

• a worm transmission associated with said drive motor and having a worm wheel and a worm shaft which is formed as a floatingly arranged extension of said motor armature shaft, said worm shaft having a free end provided with a convex end surface;
• a stationary running element against which said motor armature shaft abuts in an axial direction when it is rotated in a rotary direction, so that a pitch angle of said worm shaft in connection with a flank angle of teeth of said worm shaft produce a loading component acting transversely to a longitudinal axis of said worm shaft in a predetermined direction, said running element which cooperates with said convex end surface of said worm shaft having a running surface which is formed spatially relative to said longitudinal axis of said worm shaft so that it is inclined in the predetermined direction of action of said loading component of said worm shaft.