Suspension system of a transmission.

Suspension system a transmission of rotary-wing aircraft, particularly a helicopter, said suspension system comprising a plurality of suspension rods (15), wherein at least one of said suspension bars (15) comprises a structure (1) buffer having an internal cavity (2) and means (10, 11) for closing said internal cavity (2), system characterized in that the structure comprises an aggregate (8) comprising at least solid bodies (9) contact holes and filling said internal cavity (2).