Shutter or flap driving device for motor vehicle, has fixation element connected to fixed or mobile piece, and screw drive transmission driven by motor with reduced torque during movement of axial spacing of fixation element and enclosure

摘要

The device has a fixation element connected to a fixed or mobile piece. A tubular enclosure (1) axially moves with respect to the fixation element. A screw drive transmission includes a screw nut (9) that is arranged on a threaded screw (8). The transmission drives in axial displacement the element and enclosure with respect to each other and is rotatably driven by an electric motor (21) e.g. direct current motor, whose motor shaft drives the screw or a coupling part (6). The transmission is driven with a reduced torque, during a movement of axial spacing of the element and enclosure.