Torque transfer device

A torque transfer device, in particular in the power train of a motor vehicle, for transferring torque between a drive unit (3) and a shaft (35) that is rotatable around an axis of rotation (12), in particular a transmission input shaft, having a hydrodynamic torque converter (6), which includes a converter cover (14) that is connectable to or connected to the drive unit (3), which converter cover may be coupled via an impeller (20) to a turbine wheel (21) to transfer torque, which turbine wheel is bridgeable, to transfer torque, by a torque converter lockup clutch (48), which includes a piston (56) that is movable to a limited extent in the axial direction and is constructed as a multi-plate clutch with a plate pack (50) that includes outer plates which are connected to an outer plate carrier (52) in a rotationally fixed connection, and inner plates which are connected to an inner plate carrier (46) in a rotationally fixed connection, wherein the inner plate carrier (46) is connected via a coolant conducting device (44) in a rotationally fixed connection to a guide piece (40) in which one end of the shaft (35) is guided, and which is connected to the converter cover (14) in a rotationally fixed connection.