The two flywheel masses (1,13) are connected by a torsional damper arrangement. At least one flywheel mass contains a grease chamber (9) at least partly containing the torsional damper arrangement. Two seals (70,71) are positioned on seatings (76,87). At least one of the components (8,24) of the flywheel mass (13) possessing a sealing seating contains the mounting (27) and the seals. It has recesses (73) into which fit holders (72) for axially securing the seals in relation to the component and mounting.
