Patent ID: 8573935
Filing Date: 2013-11-05
Classification: B64C,Y10T

Abstract:
1. A rotor for a helicopter, comprising: a hub rotating about an axis and in turn comprising a number of blades; and an at least partly hollow drive shaft connectable to a drive of said helicopter and connected functionally to said hub to rotate the hub about said axis; and characterized by comprising vibration damping means in turn comprising a mass, and an elastically deformable member connected to said mass and supported by said shaft; said member extending at least partly inside said shaft, and being elongated parallel to said axis; and said mass vibrating, in use, at such a frequency as to oppose transmission to said shaft of the vibration produced by rotation of said hub and said blades and further comprising a supporting body interposed between said shaft and said member, and angularly integral with said shaft and said member.