Door drive device having a sensor apparatus for measuring a force in the force flow

A door drive device for adjusting a vehicle door relative to a vehicle body, comprising:

• an adjustment part, which is movable along an adjustment direction, for transmitting force between the vehicle door and the vehicle body,
• a drive motor,
• a gear assembly which couples the drive motor to the adjustment part,
• a gear housing which at least partially encloses the gear assembly,
• an adapter element connected to the gear housing and configured for fastening the door drive device to the vehicle door or the vehicle body, wherein the adapter element comprises an opening through which the adjustment part extends and in which the adjustment part is movable along the adjustment direction,
• a sensor apparatus for determining a measured value which indicates a force between the vehicle door and the vehicle body,
• wherein the gear assembly comprises a guide rail that is connected to the gear housing and a sliding element that is guided on the guide rail longitudinally along the adjustment direction, wherein the sliding element is adjustable by means of the drive motor and is coupled to the adjustment part,
• wherein the gear assembly comprises a spindle that is rotatable about a rotational axis and is drivable by the drive motor, wherein the sliding element is in a threaded connection with the spindle and is adjustable, for moving the adjustment part, longitudinally along the adjustment direction by rotating the spindle,
• wherein the sensor apparatus is configured to detect a change in position between the gear housing and the adapter element or between the gear housing and the guide rail in order to determine the measured value.