According to the present invention, the axial constructive length of a transporting device is shorten is such a way that a brake (24) is mounted on an elongated free end of the motor shaft (3) of the electric motor (1) and that the motor shaft (3) of the electric motor (1) is connected via a positive fitting coupling (7) to a sun gear shaft (9) of the planetary gear (8). The coupling (7) has an outer part (12) with an internal catching profile (13) and an inner part (11) with an external catching profile (14). At least one of the catching profiles (13 or 14) has a longitudinally crowned configuration.