Patent ID: 7513346

Claim:
A power transmission device ( 1 ), in particular for use in motor vehicles, with one input (E) and at least one output (A), comprising: a hydrodynamic component ( 2 ), comprising at least one pump wheel (P) and one turbine wheel (T), which together form at least one working chamber ( 23 ) that is fillable with process fluid; a lockup clutch ( 4 ) which is assigned to the hydrodynamic component ( 2 ) for at least partial bypassing of the flow of power through the hydrodynamic component ( 2 ), comprising a first friction surface arrangement ( 9 ) that includes at least one friction surface carrying element ( 15 ) and is at least indirectly coupled with the input (E) and a second friction surface arrangement ( 10 ) that includes at least one friction surface carrying element ( 16 ) and is coupled with the output (A), which can be brought in operative connection with each other using an actuating mechanism ( 14 ) comprising a piston element ( 21 ) that is pressurizable with a pressure medium, wherein: the actuating mechanism ( 14 ) forms one structural unit with a friction surface carrying element ( 15 ) of the first friction surface arrangement ( 9 ), and is connected in a rotationally fixed manner, but so that it is movable in the axial direction to the input (E) of the power transmission device ( 1 ) or to the connection between the input (E) of the power transmission device ( 1 ) and the pump wheel (P) and is free of a rotationally fixed connection to the output (A), having a sealing apparatus ( 26 ) comprising at least one first sealing device ( 27 ) and one second sealing device ( 28 ) to seal a pressure chamber ( 25 ) that is able to charge the actuating mechanism ( 14 ) with pressure medium against the hydrodynamic component ( 2 ), the first sealing device ( 27 ) being situated between the actuating mechanism ( 14 ) and the connection between the input (E) of the power transmission device ( 1 ) and the pump wheel (P) and the second sealing device ( 28 ) being directly situated between the actuating mechanism ( 14 ) and the output (A) of the power transmission device ( 1 ) for creating a sealed connection between the actuating mechanism ( 14 ) and the output (A).