Abstract: Stand-by drive operable by a crank handle in a drive unit actuable by means of an electric motor, in particular for sliding roofs of motor vehicles, wherein the drive unit comprises a gear which is connected to the electric motor, while an output part of the gear extending from the gear cooperates with the mechanism to be operated, wherein a stand-by operation part (5) biased by a spring (10) positively engages in its position corresponding to the normal state of the drive unit the output part (4) and a coaxial gear wheel (3) in such a way that the stand-by operation part (5) is axially displaceable, against the force of the spring, by slight pressure through a stand-by operation tool (15) also positively insertable in the stand-by operation part (5), from the engagement with the gear wheel (3) to a stand-by operation position only engaging the output part (4).

Abstract: A drive unit includes an electric motor and a gear device connected to the electric motor. The electric motor has a stator formed as a pole tube and a rotor arranged therein. The motor output element is formed as a gear member which surrounds the rotor periphery and is connected thereto by friction closure or form closure. The gear device is radially flanged to the cylindrical curved surface of the pole tube.