A torsional vibration damper, in particular for the drive train of a vehicle

A torsional vibration damper, in particular for the drive train of a vehicle comprising a primary side (32) and one against the action of a damper element arrangement (28) about a rotational axis (A) with respect to the primary side (32) rotatable secondary side (46), wherein the damper element arrangement (28) a first group (70) (42) and a second group (70 ') of the damper member units (42') comprises of damper member units, wherein for each damper element unit (42, 42 '), a first Drehmomentubertragungsabstutzbereich (60, 64, 58, 62) to the primary side (32) and a second Drehmomentubertragungsabstutzbereich (66, 68) is provided at the secondary side (42) and wherein the damper member units (42) of the first group (70) a relative rotation between the primary side (32) and the secondary side (46) only counteract, in a first relative rotational direction, and the damper member units (42 ') of the second group (70') of a relative rotation between the primary RPage (32) and the secondary side (46) only in one of the first relative rotational direction opposite to act opposite second direction of relative rotation, wherein at least one damper element unit (42) of the first group (70) and at least one damping element unit (42 ') of the second group (70') biased are and with respect to bias the primary side (32) and the secondary side (46) in a basic relative rotational position to each other, is characterized in that, starting from the basic relative rotational position of the primary side (32) with respect to the secondary side (46), a preload (V , V ') at least one pre-tensioned damper element unit (42) is shorter than a maximum Relativdrehweg the primary side (32) with respect to the secondary side (46).