Patent ID: 8317642

Claim:
Device for connecting a generator to a belt drive of an internal combustion engine, comprising a belt pulley that is guided so that it can rotate relative to a hub set on a shaft, at least one spring element arranged between the belt pulley and the hub connects the belt pulley and the hub to each other elastically for transferring rotational motion via contact of outwardly directed radial extensions on the hub and inwardly directed radial extensions on the belt pulley with the at least one spring element, wherein the outwardly directed radial extensions on the hub do not overlap in a radial direction with and are larger in a peripheral direction than the inwardly directed radial extensions on the belt pulley, and the at least one spring element sets a relative rotation between the belt pulley and hub corresponding to an effective torsional stiffness, the at least one spring element is placed with a defined movement play with respect to at least one of the belt pulley or the hub, in order to allow relative rotation through the defined movement play in a first region with a low, effective torsional stiffness, while, in a second region, a high torsional stiffness is generated by the at least one spring element.