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An actuating unit for an electromechanically operable disc brake for automotive vehicles including a driving unit or an electric motor, an actuating element secured against rotation and causing one of two friction linings that are arranged slidably in a brake caliper to move into engagement with a b

An actuating unit for an electromechanically operable disc brake for automotive vehicles including a driving unit or an electric motor, an actuating element secured against rotation and causing one of two friction linings that are arranged slidably in a brake caliper to move into engagement with a brake disc, as well as a reducing gear interposed between the electric motor and the actuating element. To ensure the testability of the reducing gear, the present invention includes an anti-rotation mechanism of the actuating element be arranged in a gearbox casing accommodating the reducing gear.

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1. Actuating unit for an electromechanically actuated disc brake assembly for automotive vehicles, said assembly including a brake caliper in which two friction linings that cooperate with each one lateral surface of a brake disc are arranged so as to be displaceable within limits, wherein one of th

1. Actuating unit for an electromechanically actuated disc brake assembly for automotive vehicles, said assembly including a brake caliper in which two friction linings that cooperate with each one lateral surface of a brake disc are arranged so as to be displaceable within limits, wherein one of the friction linings is directly movable into engagement with the brake disc by the actuating unit and the other friction lining is movable into engagement with the brake disc by the effect of a reaction force produced by the brake caliper, said actuating unit comprising:at least one electric motor, a reducing gear coupled to the electric motor, wherein said reducing gear is disposed within a gearbox casing, an actuating element coupled to the reducing gear, means for providing anti-rotation of the actuating element, wherein the actuating element is arranged in the gearbox casing, wherein the anti-rotation means include cylindrical rolls and also include grooves formed in the gearbox casing or the actuating element respectively. 2. Actuating unit as claimed in claim 1, wherein cylindrical rolls are retained in a slide bearing that embraces the actuating element in a radial direction.3. Actuating unit as claimed in claim 1, wherein the anti-rotation means is provided by a profiling an outside surface of the actuating element as well as profiling a mating inside surface of a slide bearing.4. Actuating unit as claimed in claim 3, wherein the slide bearing includes radial projections received in recesses or grooves.5. Actuating unit as claimed in claim 3, wherein the profiling of the outside surface of the actuating element and the profiling of the inside surface of the slide bearing are configured as a polygonal profile.6. Acting unit as claimed in claim 1, wherein the reducing gear is designed as a screw actuator, and wherein the actuating element is formed from a threaded nut of the screw actuator.7. Actuating unit for an electromechanically actuated disc brake assembly for automotive vehicles, said assembly of the type including a brake caliper in which two friction linings that cooperate with each one lateral surface of a brake disc are arranged so as to be displaceable within limits, wherein one of the friction linings is directly movable into engagement with the brake disc by the actuating unit and the other friction lining is movable into engagement with the brake disc by the effect of a reaction force produced by the brake caliper, said actuating unit comprising:at least one electric motor, a reducing gear coupled to the electric motor, wherein said reducing gear is disposed within a gearbox casing, an actuating element coupled to the reducing gear, means for providing anti-rotation of the actuating element, wherein the actuating element is arranged in the gearbox casing, wherein the anti-rotation means is provided by a profiling an outside surface of the actuating element as well as profiling a mating inside surface of a slide bearing, wherein the slide bearing includes radial projections received in recesses or grooves. 8. Actuating unit for an electromechanically actuated disc brake assembly for automotive vehicles, said assembly of the type including a brake caliper in which two friction linings that cooperate with each one lateral surface of a brake disc are arranged so as to be displaceable within limits, wherein one of the friction linings is directly movable into engagement with the brake disc by the actuating unit and the other friction lining is movable into engagement with the brake disc by the effect of a reaction force produced by the brake caliper, said actuating unit comprising:at least one electric motor, a reducing gear coupled to the electric motor, wherein said reducing gear is disposed within a gearbox casing, an actuating element coupled to the reducing gear, means for providing anti-rotation of the actuating element, wherein the actuating element is arranged in the gearbox casing, wherein the anti-rotation means is provided by a profiling an outside surface of the actuating element as well as profiling a mating inside surface of a slide bearing, wherein the profiling of the outside surface of the actuating element and the profiling of the inside surface of the slide bearing are configured as a polygonal profile.