Patent ID: 8203226

Claim:
A gear unit ( 8 ) for a wind turbine ( 1 ) having an input shaft ( 9 ) connected to a rotor hub ( 5 ) of the wind turbine ( 1 ) and an output shaft ( 10 ) for connection to an electrical power generator ( 7 ), the gear unit ( 8 ) comprising: a hollow tube ( 30 ) which is concentric with a main rotation axis (AA′) and which extends through the gear unit ( 8 ) from the input shaft ( 9 ) to the output shaft ( 10 ), wherein, the hollow tube ( 30 ) provides a sealing for the gear unit ( 8 ) in storage and/or transport; the hollow tube ( 30 ) extends additionally through the electrical power generator ( 7 ); and an energy tube ( 24 ) provided inside the hollow tube ( 30 ), the energy tube ( 24 ) provided for at least one of housing cabling ( 25 ) and tubing ( 26 ) and for the transmission of at least one of electric power and hydraulic power from rotatable rotor hub ( 5 ) to a static nacelle ( 3 ) of the wind turbine ( 1 ).