| 摘要 |
The invention relates to an actuating drive of an air passage device for an engine cooling system of a vehicle, comprising a drive gear to be driven by an electric motor, which is rotatable about an axis of rotation, and an output element which is operatively connected with the drive gear and is movable with the drive gear along an adjustment path, in order to shift the air passage device between an open position, in which the air passage device is opened in order to allow an air stream to pass through, and a closed position in which the air passage device is closed in order to minimize an air stream. The actuating drive comprises a transmission element arranged between the drive gear and the output element for establishing the operative connection between the drive gear and the output element and an actuator which cooperates with the transmission element such that in a first position of the actuator the output element is directly coupled with the drive gear for movement along the adjustment path and in a second position of the actuator, at least when the output element is located in a predetermined portion of the adjustment path, is movable relative to the drive gear. |
