Patent ID: 6325327
Filing Date: 2001-12-04
Classification: B64C,F16F

Abstract:
An anti-vibration suspension device for a helicopter main rotor comprising a rotor mast driven in rotation by a main gearbox about an axis of the mast, which is the axis of rotation of the rotor, the suspension device comprising at least three oblique bars supporting the gearbox on the helicopter structure, the oblique bars being distributed around the gearbox and inclined relative to one another on the side of their top ends, the oblique bars being articulated, on the one hand on the gearbox by means of their top ends, and on the other hand on the helicopter structure by their bottom ends, and by means of levers, a same number of these being provided as there are oblique bars, each lever supporting at least one vibrating weight at one end and being pivotably joined to the structure by an opposite end-part, in the vicinity of which the bottom end of a corresponding oblique bar is pivotably mounted on the corresponding lever, the joints linking each lever to the structure and to the corresponding oblique bar being articulated joints which pivot at least about axes substantially perpendicular to a corresponding plane passing through the longitudinal axis of the corresponding oblique bar and the vertical projection of said longitudinal axis onto said structure, wherein each lever is also joined to the structure by at least one torsion spring, biased about a torsion axis substantially parallel with said pivot axes.