If a chain drive only includes devices that on the one hand support a largely constant moment and on the other hand offer little resistance to the rotational irregularities of the drive shaft due to low mass moment of inertia, this drive normally shows very low dynamic effects. Such a chain drive can be operated using a mechanical tensioning element without damping. These often consist only of a tensioning rail and a spring element, although a non-movable base supporting element rigidly connected to the engine may be included. Since the tensioner is always on the unloaded chain strand, a small spring force is sufficient, which has the effect of reducing friction to a minimum. Due to the low forces, a plastic design without a reinforcing substructure is often sufficient.