US 6,200,097 B1Granted

Hub for rotor head of rotary-wing aircraft and rotor head with such hub

OwnerRené Mouilleinventor

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Abstract

A hub for the rotor head of a rotary-wing aircraft having a plurality of blades radially linked to the hub by a blade root provided with a rigid hub includes spherical stops associated with the blades, which stops have an inner armature linked to the root of the blade and an outer armature linked to the hub. The hub includes an upper plate and a lower plate formed of two separate components which are assembled with an outer armature of spherical stops being interposed therebetween, so that the spherical stops are housed in the space defined by the plates. The outer armature is arranged at the periphery of the plates so that a hollow hub is obtained without requiring a sidewall with apertures, so as to facilitate the mounting and/or removal of the blades and the spherical stops. The plates may have a triangular shape with cutoff corners wherein a plurality of outer armatures is arranged near the cut-off corner.

Claims14

Dependent claims

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.

A rotor head for rotary-wing aircraft, including:

a hub;
at least two blades, each of which is linked radially to said hub by a blade root which is provided with a rigid loop
constituting the attachment of the blade onto said hub;
laminated spherical stops, each of which is associated with one blade 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 the 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 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.

2 more elements

Dependencies are inferred from the claim text.