Rotorcraft rotor comprising a hub made of composite materials obtained from carbon fiber fabric dusted in a thermoplastic resin

A rotorcraft rotor having a hub made of composite material obtained by stacking successive layers of mineral fiber fabric that are impregnated with a resin, the hub firstly being mounted coaxially around a rotary shaft extending through a bore in the hub, and secondly including a plurality of branches extending radially from the bore, which branches have respective individual blades mounted thereon, the blades being individually mounted to be movable relative to the hub at least for varying pitch;

• wherein:
• the hub is formed essentially by a monolithic body of composite materials obtained by stacking successive layers of carbon fiber fabric dusted with a thermoplastic resin and compressed while hot;
• the blades are individually mounted to be movable relative to the hub by respective hinge systems, each having a respective assembly strength member for assembling to a respective one of the branches, the strength member bearing radially against the branches while being individually housed at least in part in respective sockets of the monolithic body, extending in its axially-extending direction;
• and
• the sockets being deformable under the effect of the rotor being set into rotation, the shape of the sockets is defined on fabrication so as to form a radial thrust seat enabling the strength members to bear against the branches via respective bearing surfaces that become cylindrical under the effect of the rotor being set into rotation at a predefined operating speed, the radial thrust seat having a cylindrical bearing surface extending along a generator line oriented in the axially-extending direction of the hub and being of shape that is complementary to a given cylindrical bearing surface of the strength member.