In response to the increased demands on torsional couplings in the construction equipment market, Voith Turbo has introduced the coupling type BR 350 for flanged construction machine gearboxes. This torsional vibration damper protects drivelines against excess loads. It is a hydraulic damping and isolation system that provides progressive stiffness characteristics, speed-proportional damping, and high-temperature and media resistance. Its progressive characteristic curve produces large torsional angles at low torques. In addition, torque capacities rise as a result of stiffer characteristics in the upper range. This damping effect, caused by the displacement of grease, reacts optimally to high torsional amplitudes during traveling resonances or shock loads but also during lower amplitudes in the nominal range. It is compact, allowing mounting to all conventional engine flywheels, is easy to assemble, and provides failure safety.