Patent ID: 8313297

Claim:
A rotor shaft for a wind energy plant, wherein the rotor shaft is at least partially hollow, comprising a line pipe ( 16 ), extending in the interior of the rotating rotor shaft ( 10 ) and being stationary and accommodating electric lines ( 18 ), a transmission device ( 22 ), arranged at least partially in the rotor shaft ( 10 ), for the electric connection between a stationary nacelle and a rotating rotor of the wind energy plant, wherein the transmission device ( 22 ) features a first body ( 24 ), stationary and connected to the line pipe ( 16 ), and a second body ( 28 ) rotating with the rotor shaft ( 10 ), and wherein there is an electric sliding contact between the first and the second body ( 24 , 28 ), a casing ( 30 , 36 ) surrounding the transmission device ( 22 ) and formed separately from the second body ( 28 ), which is connected to the rotor shaft ( 10 ) and/or adapted to be connected to a rotor hub ( 14 ) of the wind energy plant, and which rotates with the rotor shaft ( 10 ), and a torque transmitting connection ( 38 ) between the casing ( 30 , 36 ) and the second body ( 28 ) of the transmission device ( 22 ).