Patent ID: 8393866

Claim:
A drive device (D) for driving first and second lift rotors ( 2 , 3 ) of a twin-rotor rotorcraft, said drive device (D) being provided with first and second main gearboxes ( 7 , 8 ) respectively provided with first and second transmission members ( 74 , 84 ) suitable for setting said first and second rotors ( 2 , 3 ) into rotation, said drive device (D) including at least one engine ( 41 , 42 ) for driving said first and second transmission members ( 74 , 84 ), wherein the drive device includes link means provided with first and second transmission shafts ( 5 , 6 ) for synchronizing said first and second transmission members ( 74 , 84 ), said first main gearbox ( 7 ) being provided with first power combiner means ( 73 ) firstly meshing with said first transmission member ( 74 ) and secondly mechanically linked with said first transmission shaft ( 5 ) and with said second transmission shaft ( 6 ), and said second main gearbox ( 8 ) being provided with second power combiner means ( 83 ) firstly meshing with said second transmission member ( 84 ) and secondly mechanically linked with said first transmission shaft ( 5 ) and with said second transmission shaft ( 6 ).