Integrated hub-mast and gyroplane rotor head comprising it

An integrated hub-mast for a gyroplane rotor having a plurality of blades, the hub-mast comprising:

• a hollow-tubular hub body having an axis of rotation (A),
• a tubular mast forming portion coaxially firmly secured to one end of the hub body,
• a foot coaxially formed on one end of the mast forming portion opposite the hub body,
• the hub body widening out radially from said one end thereof and being pierced with openings equal in number to the plurality of blades evenly spaced apart in the circumferential direction about the periphery of hub body,
• a reinforcing ring fixed to the other end of the hub body in a plane (M) of rotation of the plurality of blades and having a plurality of coupling fastenings, the ring taking up centrifugal forces introduced into the hub-mast from rotation of the blades,
• a forked fastening part for each one of the plurality of blades, each forked part having two branches, one of the two branches passing through one of the openings in the hub body under the reinfrocing ring, the other branch passing over the reinforcing ring,
• a plurality of stratified spherical stops, one for each blade, housed inside the hub body, each spherical stop having a radially external frame fixed against an internal face of the reinforcing ring such that a center of rotation of the spherical stop is substantially situated in the reinforcing ring and a radially internal frame, radially internal ends of the two branches of one forked fastening part being fixed to the internal frame of one spherical stop,
• a plurality of resilient drag return and damping members, one for each blade, each member being connected to one of the coupling fastenings of the reinforcing ring and being operatively asociated with one of the blades,
• one central flapping stop internal to the hub body for limiting flapping of the blades on one side at least of the plane (M) of rotation of the blades, and
• a support coaxially housed in the hub body supporting the central flapping stop.