Patent ID: 6910562

Claim:
A torsional-vibration damper comprising: at least one primary element; a secondary element; a spring device adapted to couple said at least one primary element and said secondary element to each other, said at least one primary element and said secondary element being limited in movement in relation to each other about a rotational axis; a friction device adapted to bring said at least one primary element and said secondary element into frictional contact with each other and including at least two friction-surface-carrying elements rubbing against each other; and a force-generating device adapted to generate a contact-pressure force to be applied to said at least two elements to produce a frictional engagement therebetween, said force-generating device including a mechanical actuating mechanism for generating an actuating force and a hydraulic actuating mechanism for generating a counterforce, wherein the contact-pressure force is a vector sum of said actuating force and said counterforce.