Abstract: An air guiding device for a motor vehicle has a spoiler lip (12) extending in the transverse direction (FQ) of the vehicle, and an actuating device (34) for the spoiler lip (12) in such a manner that the spoiler lip (12) is movable between a retracted rest position (RS) and an extended maximum position (MS). The spoiler lip (12) has, in the region of the longitudinal side (22) thereof which is directed toward a roadway, a flexurally elastic rod (24) that is guided movably in a guide device (26). A displacement measuring device (40) detects a position of the rod member (24).

Abstract: A motor vehicle front spoiler has a spoiler lip (11) extending in the region of a front part of the motor vehicle over the entire width or part of the width of the front part. An actuating element (12) enables the spoiler lip (11) to be shifted between an extended operating position, in which the spoiler lip (11) forms a downwardly directed extension of the front part and acts as an aerodynamic air-guiding device, and a retracted inoperative position, in which the spoiler lip (11) is directed to the rear and essentially has no aerodynamic air-guiding effect. A portion (13) of the spoiler lip (11) that is at the bottom in the operating position of the spoiler lip (11) and is in the vicinity of the roadway can be replaced.

Abstract: An undercarriage liner made of plastic for a vehicle is detachably attached to the adjacent vehicle chassis. In order for an undercarriage liner to have a significantly lower weight per unit of area, and thus a definitely reduced total weight, while retaining the same flexural strength and impact strength, the undercarriage liner, in the form of a sandwich structure, has a lightweight core layer of polypropylene foam or unconsolidated glass-mat-reinforced thermoplastic. The core layer is provided with a thin cover layer of polypropylene fiber-reinforced polypropylene on both sides. The two rigid and high-impact cover layers are each thermally bonded to the core layer.