Patent ID: 6164915
Filing Date: 2000-12-26
Classification: B64C,F16F,Y10S

Abstract:
An anti-vibration suspension device for a helicopter main rotor including a rotor mast rotated by a main transmission box around an axis of the mast which is the rotation axis of the rotor, the suspension device including at least three diagonal and rigid bars supporting the transmission box on a structure of the helicopter, the diagonal bars being distributed around the transmission box and inclined on the rotor axis so that said diagonal bars converge towards one another on their upper end side, substantially towards a point on the rotor axis, the diagonal bars being connected in an articulated way, on the one hand, to the transmission box by their upper ends and, on the other hand, to the helicopter structure by their lower ends and by means of rigid levers which are equal in number to the diagonal bars, each lever supporting at least one damping weight at one end and being connected in an articulated way to the structure by an opposite end part, near to which the lower end of a corresponding diagonal bar is articulated on the corresponding lever, the articulations connecting each lever to the structure and to the corresponding diagonal bar being at least pivot articulations around axes which are substantially perpendicular to a corresponding radial plane passing through the rotor axis and through the longitudinal axis of the corresponding diagonal bar wherein the device further includes for each diagonal bar a flexible tension bar, which is flexible in tension and is likewise inclined on the rotor axis in the corresponding radial plane so that the tension bars converge towards one another on their upper end side, each tension bar being articulated by its upper end on the transmission box and by its lower end on the helicopter structure, and the corresponding lever is fastened by articulations to the structure while at the same time being articulated to the lower end part of the tension bar, at least pivoting around an axis which is substantially perpendicular to the corresponding radial plane.