Patent ID: 6200097
Filing Date: 2001-03-13
Classification: B64C

Abstract:
A hub for a rotor head of a rotary-wing aircraft, said aircraft comprising at least two blades each of which is linked radially to said hub by a blade root provided with a rigid loop constituting an attachment of each of the blades onto said hub, laminated spherical stops carried by said hub and each of which is associated with an associated one of said blades and comprises, between an outer armature rigidly linked to said hub and an inner armature linked to the root of said blade, an alternating stack of rigid cups and layers of an elastic material in a form of spherical portions having a common center, each laminated spherical stop, for the associated blade, constituting an element for retaining on said hub and a single articulation in flapping, drag and pitch, and said rigid loop of a blade surrounding the associated laminated spherical stop and being integral with the inner armature of this latter stop,wherein said hub comprises an upper plate and a lower plate forming two separate components assembled to one another with the outer armatures of said spherical stops being interposed, so that said upper and lower plates are spaced from one another and define between them a space in which said spherical stops are housed, said outer armatures being arranged at a periphery of said plates and being traversed by fixing means integrating together said plates and said spherical stops.