HYBRID COMPOSITE TORSION BAR FOR HINGELESS ROTOR OF HELICOPTER (VERSIONS) Russian patent published in 1999 - IPC

FIELD: aviation. SUBSTANCE: torsion bar is divided into eight sections lengthwise: section for securing to hub, first root trapezoidal section, second root trapezoidal section, root adapter section, twisted section having cruciform cross section, peripheral adapter section, peripheral trapezoidal section and section for connection with rigid pipe and blade. Twisted section consists of unidirectional glass fibres, equiproportional composition of layers of unidirectional glass fibres and graphite and layers of unidirectional graphite; layers of unidirectional glass fibres and graphite of different length are laid between above-mentioned layers on second root trapezoidal section. Layers of diagonally directed glass fibers and graphite of different length are laid on first root trapezoidal section between layers. Diagonally directed glass fibers and graphite, as well as layers of unidirectional glass fibres and graphite are laid between layers on peripheral trapezoidal section. End faces f insertion layers are smoothly distributed in layer structure due to which delamination loads are evenly distributed in torsion bar in area of increasing layers. EFFECT: improved technological and service characteristics. 25 cl, 13 dwg