Apparatus for damping torsional vibrations

A dual mass flywheel between the output element of the engine and the power train of a motor vehicle is provided, which includes: a primary mass adapted to be attached to a crankshaft of an engine for rotation, the primary mass including two sheet metal components defining a damping chamber; a secondary mass supported for rotation relative to the primary mass and adapted to be coupled to a friction clutch; and a drive plate that is coupled to the secondary mass. A vibration damper is installed between the primary and secondary masses, the vibration damper including a plurality of ball members which move along the damping chamber by centrifugal force; a plurality of ball guide members; a plurality of resilient members; and a drive guide.