Abstract: A fastening system used for the joint between a rotary shaft and a wind turbines pitch system which includes a front flange and a rear flange, which are joined together and supported on the hollow rotary shaft, and which are coupled to the pitch system having the bearings for the shaft and the star-shaped part. A fastening method couples the rear flange to the hollow shaft with a tapered collar and also to the front flange through spacer bushings.

Abstract: Fastening system for wind turbines characterized by comprising a front flange (9) and a rear flange (8), which are joined together and supported on the hollow rotary shaft (2), and coupled to the pitch system comprising the bearings (6) for the shaft and the star-shaped part (4). The fastening method couples the rear flange (8) to the hollow shaft (2) with a tapered collar (10) and also to the front flange (9) through some spacer bushings (11). The collar (10) uses friction to transfer significant moments and axial stresses so as to improve the fastening system, and the direction of the bolts on the collar (10) and the bolts (12) on the spacer bushings (11) simplify inspection and maintenance tasks.