The figure shows the vibration control system of a motor vehicle spare drive. For Torque conversion to a CVT transmission having a continuously variable ratio ICVT is used which depends on the radiuses r1 and r2. For this, the conical discs are axially displaced. The conical disk pairs (J21, J22) and the belt (m2) are mass subject, where in the belt is rigid. The elastic waves with the torsional stiffness c1 and C3 can be considered as massless. The rear axle is a solid axle (c41 and C42 - "infinity) and mass-executed subject