Patent ID: 7017722

Claim:
A hydrodynamic torque converter located in a housing ( 1 ) comprising: at least one clutch ( 2 ); an actuation device having at least one piston ( 3 ); a hydraulic pressure within said housing ( 1 ) acting upon a first piston area ( 4 ); a hydraulic pressure changeable by a control unit ( 11 ) acting upon a second piston area ( 5 ); the hydraulic pressure acting upon said first piston area ( 4 ) acting directly or indirectly upon said control unit ( 11 ) and said control unit ( 11 ) adjusts the hydraulic pressure upon said second piston area ( 5 ) depending on the hydraulic pressure upon said first piston area ( 4 ); and wherein one drive mechanism of said torque converter ( 1 ) is connectable via said at least one clutch ( 2 ) with one pump impeller ( 6 ) of said torque converter.