Drive device for a roof component of a vehicle

1. A drive device configured for a roof component of a vehicle comprising:

an electric motor which interacts with a gearbox for operating the roof component,

wherein the electric motor is an external rotor electric motor of a flat construction mode which is aligned so as to be parallel to the installation height of the drive device in a vehicle roof and which has a wheel-shaped external rotor which engages with the gearbox by way of a toothing provided on its external circumference,

wherein the rotor comprises a flat support element having an upper side and a further element encircling the support element on which the toothing is formed,

wherein the upper side is provided with radially extending cooling vanes, which are set to be transverse,

wherein the cooling vanes are inclined and aerodynamically shaped to generate an airflow through the rotor in a direction towards a stator of the motor when the rotor rotates in a first direction,

wherein the cooling vanes extend in a radially outer region of the upper side,

wherein the cooling vanes are aerodynamically shaped such that air flows through the rotor in a direction away from the stator of the motor when the rotor rotates in a second direction, and

wherein the cooling vanes are configured such that an air flow toward the stator of the motor is generated when the rotor rotates in the direction in which the motor is operated at a higher power, and an air flow away from the stator of the motor is generated when the rotor rotates in the direction in which the motor is operated at a lower power.

2. The drive device as claimed in claim 1 , wherein the gearbox comprises two threaded spindles which are configured for meshing with the toothing of the electric motor and for driving a helix cable, wherein the helix cable is fixed to the roof component.

3. The drive device as claimed in claim 1 , wherein the toothing provided on the external circumference of the external rotor is a worm thread.

4. The drive device as claimed in claim 1 , wherein the external rotor electric motor has an installation height of 15 mm to 25 mm.

5. The drive device as claimed in claim 1 , wherein the external rotor wheel is a worm wheel.

6. The drive device as claimed in claim 1 , wherein the external rotor wheel, which is a worm wheel, comprises a plastics material component or is formed from plastics material.

7. The drive device as claimed in claim 1 , furthermore comprising a support part having a hub bearing configured for rotatably mounting the external rotor wheel, and at least one threaded spindle support which is configured for mounting the thread, wherein a stator element of the electric motor is disposed around the hub bearing.

8. The drive device as claimed in claim 7 , wherein the support part is configured so as to be integral with the hub bearing and the at least one threaded spindle support.

9. The drive device as claimed in claim 1 , wherein the external rotor motor is a brushless electric motor.

10. The drive device as claimed in claim 1 , wherein the external rotor electric motor has an installation height of 16 mm to 18 mm.

11. The drive device as claimed in claim 1 , wherein the roof component is a sliding roof or a solar protection roller blind.