Patent ID: 8922047

Claim:
A horizontal-axis wind turbine comprising: a rotor having a hub and blades rotatable by wind; a nacelle assembly for rotatably supporting the rotor through a main shaft, the main shaft being connected to the rotor; a tower for rotatably supporting the nacelle assembly; a dynamo placed near to a location at which the tower is built up; a rotatable vertical shaft placed inside the tower and orthogonally disposed to the main shaft for transferring a rotating force of the main shaft to the dynamo; and a repulsive toque-balancing mechanism for transferring a rotating force of the nacelle assembly, the rotating force of the nacelle assembly being derived from repulsive torque due to a load of the dynamo, to the vertical shaft in a direction in which the repulsive toque is balanced, which comprises: an upper hollow section fixed to the bottom wall of the nacelle assembly in the tower; a casing combined to the upper hollow section and disposed under the vertical shaft for rotatably supporting a horizontal shaft, wherein the horizontal shaft is engaged with the vertical shaft and is orthogonal to the vertical shaft; a lower support orthogonally disposed with respect to the vertical shaft for rotatably supporting the casing, and for rotatably supporting a rotating shaft of the dynamo; and a transferring unit for transferring the rotating force of the nacelle assembly to the casing.