Patent ID: 7384239

Claim:
Drive device for a energy input mechanism operating a wind turbine comprising two counter-rotative propellers, the first one being facing the wind flow, while the second one is placed behind the first propeller, the wind turbine including: an epicycloidal multiplier, a first shaft supporting the first propeller linked to a train of planetary wheels of the epicycloidal multiplier, a second shaft supporting the second propeller linked to the crown wheel of the epicycloidal multiplier, the solar wheel of said epicycloidal multiplier being connected to a third shaft driving the afore-mentioned energy input mechanism, including a braking system that acts simultaneously on the second shaft and on the first shaft, the braking system including a pressure mechanism commanded by an activation mechanism, able to act simultaneously by rubbing against an outer armature of the second shaft to slow it down, able to press against a plurality of tappets located in the radial openings arranged around the second shaft, wherein these tappets rub against an outer armature of the first shaft and slow down the second shaft inside which the first shaft is coaxially placed.