Torsional vibration damper

A torsional vibration damper in the form of a two-mass flywheel for a motor vehicle, comprising:

• a primary mass hat is connected to a drive shaft of a drive engine in a torsionally rigid manner and revolves therewith, at least one energy storage element, and a secondary mass which is driven in a torsionally flexible manner by the primary mass via the energy storage element, wherein the torque fed into the primary mass via the drive shaft is transmitted to at least one further link of the motor vehicle drive train arranged in a housing via an output shaft of the secondary mass, wherein the primary mass is a rotationally symmetrical hollow body that is open at least on one side concentrically to its axis of rotation and surrounds the secondary mass, and the open side of the hollow body is penetrated by the output shaft of the secondary mass, wherein the output shaft of the secondary mass is rotatably supported in the housing, wherein the hollow body forming the primary mass is rotatably supported on the housing by a sealing assembly sealing its open side in a liquid- and/or dust-tight manner