Abstract: A wind deflector for a vehicle is provided. The wind deflector includes a movably mounted deflector element and an actuator for moving the deflector element. The actuator can move the deflector element in a linearly oscillating manner in one direction in space, especially vertically. The linear movement can be performed regardless of a curvature of a class A surface of a vehicle.

Abstract: A peristaltic pump for conveying fluids includes a stator and a rotor supported therein. A flexible hose is integrated in the stator and the rotor includes radially arranged conveying elements which squeeze the hose over a section containing the fluid. The squeezed fluid section moves progressively in the hose under the effect of a motor connected to the rotor. The conveying elements are designed as rotatably mounted rollers that include at least two rolling bearings, of which the outer rings are connected via a common outer sleeve and of which the inner rings are connected to the rotor. Under the effect of the motor, the rotor moves in the stator and the outer rings of the conveying elements roll on the inner surface of the stator.

Abstract: A wind deflector for a vehicle is provided. The wind deflector includes a movably mounted deflector element and an actuator for moving the deflector element. The actuator can move the deflector element in a linearly oscillating manner in one direction in space, especially vertically. The linear movement can be performed regardless of a curvature of a class A surface of a vehicle.

Abstract: A piezoelectric loudspeaker has a membrane and at least two flexural piezoresonators, one end of which is fixed, while the other end acts mechanically upon the membrane. The membrane is a flat membrane or a conical membrane having an aperture angle smaller than 10.degree..