Patent ID: 7077752

Claim:
A torsional vibration damper comprising: a first subassembly and a second subassembly rotatably moving relative to one another; and at least one coupling element including an essentially tangentially effective elastic element for interconnecting the first and second subassemblies, and at least one thrust piston connected to the elastic element, wherein during a first phase in which the first and second subassemblies rotate relative to one another about a predetermined angle of rotation, the thrust piston moves slower than said first subassembly and is moved faster than said first subassembly during a second phase when the rotation of the first and second subassemblies exceeds the predetermined angle of rotation, whereby the thrust piston applies upon the first subassembly in opposition to the rotation thereof a restoring force which increases with increase in the relative rotation of the first and second subassemblies above the predetermined angle of rotation.