Patent ID: 8919509

Claim:
A torque transfer device in the power train of a motor vehicle, for transferring torque between a drive unit ( 3 ) and a transmission input shaft ( 35 ) that is rotatable around an axis of rotation ( 12 ) for the 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, the torque transfer device including: a guide piece ( 40 ) permanently non-rotatably connected to the converter cover and arranged to directly contact and guide the transmission input shaft; a coolant conducting device ( 44 ) permanently non-rotatably connected to the guide piece ( 40 ); a first coolant channel at least partially disposed between the coolant conducting device and the piston; at least one through-hole ( 100 ) in the guide piece, the at least one through-hole wholly enclosed by the guide piece in a radial direction orthogonal to an axis of rotation for the torque converter and including: a first end in the guide piece opening directly into the first coolant channel; and, a second end, wherein: the inner plate carrier is permanently non-rotatably connected to the coolant conducting device when the converter clutch is open; and, a line parallel to an axis of rotation for the torque converter passes through the through-hole and the first and second ends of the through hole without touching the guide piece.