TORSIONAL VIBRATION DAMPING ASSEMBLY FOR A DRIVE TRAIN OF A VEHICLE

The invention relates to a torsional vibration damping assembly (30) for a drive train of a motor vehicle, comprising a rotational mass assembly (40) that can be rotated about an axis of rotation A and a spring assembly (90), which is arranged outside of the rotational mass assembly (40) and is operatively connected to the rotational mass assembly (40) and is rotationally fixed with respect to the axis of rotation A. The rotational mass assembly (40) comprises a primary inertia element (4) that can be rotated about the axis of rotation A, a secondary inertia element (5) that can be rotated in relation to the primary inertia element (4), and a displacing unit (6). The displacing unit (6) is operatively connected to the primary inertia element (4) on one side and to the secondary inertia element (5) on the other side. The displacing unit (6) comprises a working chamber (61) having a volume V1. A volume V1 of the working chamber (61) is changed by rotation of the primary inertia element (4) about the axis of rotation A in relation to the secondary inertia element (5) from a resting position. The spring assembly (90) comprises a slave cylinder (15) having a working chamber (71) with a volume V2. The working chamber (71) of the slave cylinder (15) is operatively connected to the working chamber (61) of the displacing unit (6). The slave cylinder comprises a stiffness (19) that works against a volume change V2 in the working chamber (71) of the slave cylinder (15). The primary inertia element (4) or the secondary inertia element (5) is operatively connected to a damper assembly (20).