HUB PLATE FOR A HELICOPTER ROTOR,METHOD OF MANUFACTURE IT AND A HELICOPTER ROTOR HUB EQUIPPED WITH SAID HUB PLATES

摘要

pA hub plate and helicopter rotor incorporating same made of a composite material and comprising a laminated disc constituted by layers of fiber cloth having high mechanical strength. A frame of the disc is made of aligned layers of the cloth with the weft or warp of the cloth extending radially in the direction corresponding to the direction of centrifugal force acting on the plate when in use. The aligned layers are positioned at the core of the structure and at least at the surface of the structure in the peripheral portion of the disc. The disc is enclosed by a belt of parallel threads consisting of fibers having high mechanical strength fitted on radially outwardly projecting parts of the disc in recesses formed in the outer edge of the parts, the recesses being open to the exterior./p[US4556365A]