Attaching a flywheel to the crankshaft of an engine

The invention relates to fixing a flywheel or inertia mass or a clutch module to the output end of a crankshaft of an internal combustion engine. For this purpose is achieved in two parts, an axially oriented teeth, for example a front toothing 10 of the Hirth type, and there is provided a screw element 12 central, which engages in a thread in the crankshaft 9. to achieve a reliable connection in use, the two parts are biased by a resilient prestress axially oriented.