Patent ID: 8322504

Claim:
A combined power transmission and drive unit ( 1 ) for application in drive trains in hybrid systems ( 2 ) with at least two prime movers ( 3 , 5 ), which can be coupled via a power transmission unit ( 9 ) with a transmission ( 8 ), wherein between a first prime mover ( 3 ) and the power transmission unit ( 9 ) a device ( 18 ) is provided for connecting/disconnecting the power flow between the latter and the power transmission unit ( 9 ), comprising a friction clutch device ( 19 ) with: first and second pluralities of clutch plates; a first clutch part ( 19 E); a second clutch part ( 19 A); a servo unit ( 20 ), including at least one piston element ( 21 ) axially displaceable to close the friction clutch; and, a controlling element ( 29 ): connected with the first clutch part such that rotation of the controlling element is locked to rotation of the first clutch part; with a radially outermost end with a pressure-tight engagement with the at least one piston element; and, rotatable with respect to the at least one piston element, wherein: respective radially innermost portions of the first plurality of clutch plates are connected to the first clutch part and, radially outermost portions of the second plurality of clutch plates are connected to the second clutch part.