Power transmission device

1. 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).

2. The power transmission device ( 1 ) recited in claim 1 wherein the means ( 52 ) for position fixing and/or pre-tensioning the actuating mechanism ( 14 ) in the axial direction include a spring device ( 53 ) that works on at least one side of the actuating mechanism ( 14 ).

3. The power transmission device ( 1 ) recited in claim 2 wherein the means ( 52 ) for position fixing and/or pre-tensioning the actuating mechanism ( 14 ) in the axial direction include a spring device ( 53 ) that works on both sides of the actuating mechanism ( 14 ) and the spring device ( 53 ) has a second spring unit ( 61 ) that is situated between a face ( 62 ) of the actuating mechanism pointing away from the hydrodynamic component ( 2 ) and the housing ( 7 ).

4. The power transmission device ( 1 ) recited in claim 3 wherein the first spring unit ( 54 ) is braced in the radial direction in the area where the piston element ( 21 ) is guided at the output (A).

5. The power transmission device ( 1 ) recited in claim 2 wherein the first and second spring units ( 54 , 61 ) of the spring device ( 53 ) are fixed in their position in the radial direction and axial direction on at least one of the two elements that are tensioned against each other actuating mechanism ( 14 ) and/or housing ( 7 ) and/or output (A) or elements coupled with these in a rotationally fixed manner.

6. The power transmission device ( 1 ) recited in claim 5 wherein the position fixing is friction-locked or positive-locked.

7. The power transmission device ( 1 ) recited in claim 2 wherein the spring device ( 53 ) includes a first spring unit ( 54 ) that is situated between a face ( 57 ) pointing to the hydrodynamic component ( 2 ) and the output (A) or an element coupled to the latter in a rotationally fixed manner on a surface pointing in the axial direction.

8. The power transmission device ( 1 ) recited in claim 2 wherein the spring device ( 53 ) has through openings ( 60 , 66 ) for the fluid flows in the power transmission device ( 1 ).

9. The power transmission device ( 1 ) recited in claim 2 wherein the first and second spring units ( 54 , 61 ) include a diaphragm spring or are made up of a plurality of individual spring elements arranged at intervals from each other in the circumferential direction.

10. The power transmission device ( 1 ) recited in claim 1 , wherein the piston element ( 21 ) is preferably designed as a formed part and has at least four areas, a first and second sealing area ( 42 , 64 ), a stop area ( 45 ) to limit the axial movability in the direction contrary to the lockup clutch ( 4 ), and a friction surface bearing area ( 47 ), where the sealing areas ( 42 , 64 ) have surface areas that are designed parallel to the connecting elements housing ( 7 ) and output (A), and the sealing devices ( 27 , 28 ) being situated between these.

11. The power transmission device ( 1 ) recited in claim 10 , wherein the first sealing device ( 27 ) is situated between a surface area on the actuating mechanism ( 14 ) that is oriented in the radial direction and a surface area on the connection between the input (E) of the power transmission device ( 1 ) and the hydrodynamic component ( 2 ) pointing in the radial direction to an axis of rotation (R) for the power transmission device ( 1 ), and the second sealing device ( 28 ) in the radial direction between the output (A) of the power transmission device ( 1 ) and the actuating mechanism ( 14 ).

12. The power transmission device ( 1 ) recited in claim 1 wherein the rotationally fixed connection between the actuating mechanism ( 14 ) and the connection between the input (E) of the power transmission device ( 1 ) and the pump wheel (P) is of friction-lock or positive-lock design.

13. The power transmission device ( 1 ) recited in claim 12 wherein the piston element ( 21 ) of the actuating mechanism ( 14 ) includes a partial area having gearing ( 40 ) in the radial direction in the area of the outer circumference, which can be brought into operative connection with complementary gearing ( 39 ) on the connection between input (E) of the power transmission device ( 1 ) and pump wheel (P).

14. The power transmission device ( 1 ) recited in claim 1 further comprising means ( 52 ) for position fixing and/or pre-tensioning the actuating mechanism ( 14 ) in the axial direction.

15. The power transmission device ( 1 ) recited in claim 1 wherein the piston unit ( 21 ) is executed as a shaped sheet metal part.

16. The power transmission device ( 1 ) recited in claim 1 wherein the piston unit ( 21 ) is made of a cast iron material, light metal, synthetic or a fiber composite material.

17. The power transmission unit ( 1 ) recited in claim 1 wherein the transmission is designed as a three-channel system, including a first connection ( 17 ) for coupling with the working chamber of the hydrodynamic component ( 2 ), a second connection ( 18 ) for coupling the intermediate space ( 24 ) between outer circumference of the hydrodynamic component ( 2 ) and housing ( 7 ), and a third connection ( 20 ) for coupling with the pressure chamber ( 25 ) assigned to the piston element ( 21 ) for charging with a pressure medium.

18. The power transmission device ( 1 ) recited in claim 1 wherein the hydrodynamic component ( 2 ) is designed as a hydrodynamic rotational speed/torque converter ( 6 ), including in addition at least one guide wheel (L).