Rotor mounting assembly for rotary wing aircraft

Claim 1

In a rotor head mounting assembly for the rotor of rotary wing aircraft having rotor blades each including a blade root pivotally supported at a rotor head by blade angle bearings, said rotor head being formed as an integral body of composite fiber material shaped to define a plurality of bifurcated rotor blade mounting support arms each having a rotor blade mounted therebetween, said rotor head being essentially composed of generally congruent plate members with intermediate spacer means located therebetween, said plate members and said spacer means being integrally joined together to form said rotor head as a unitary body of composite fiber material, each of said mounting support arms being equipped with load-bearing connection means for mounting between the sides of each of said bifurcated support arms a rotor blade root, said connection means being formed to enable bearing of compressive stresses in the longitudinal direction of a rotor blade while allowing angular movement of said blade, the improvement comprising that said rotor blades are formed at least in the region of said blade roots with a laminated configuration of composite fiber material, that at least two layers of said laminated configuration are formed with a fiber loop having a unidirectional fiber orientation which extends longitudinally of said rotor blade and about said load-bearing connection means and about its support point at the side of said blade root, that an intermediate layer having a crosswise fiber orientation is provided between each of said at least two layers which integrally joins said two layers, and that said fiber loop is enclosed by support members at its longitudinal edges at the inside and outside thereof at least in the region of said load-bearing connection means.