TORSIONAL VIBRATION DAMPER

A torsional vibration damping apparatus, such as a clutch disc or clutch plate in an automated or manually operable friction clutch which is employed in the power train of a motor vehicle, has a rotary input component adapted to be driven by a prime mover, a rotary output component coaxial with the input component and arranged to transmit torque to a manually or automatically shiftable transmission, and several series-connected torsional vibration dampers serving to oppose rotation of the input and output components relative to each other. At least one of the dampers constitutes a preassembled module wherein coaxial annular input and output elements are provided with arcuate pockets for circumferentially extending coil springs serving to oppose rotation of the input and output elements relative to each other. The elements are further provided with rigid and/or resilient projections and/or other suitable confining configurations which can couple the elements to at least one of the coil springs to thus hold such elements against movement axially and away from each other.