ROTORCRAFT ROTOR WITH BLADE FOLDING SYSTEM Russian patent published in 2014 - IPC B64C27/32 B64C27/39 

FIELD: aircraft engineering.

SUBSTANCE: rotorcraft rotor comprises blades, hub with ears in number equal to that of blades and blade-to-hub joint. Said joint comprises horizontal hinge, two radial elastomer bearings and two axial elastomer bearings. Axial hinge consists of axle hinge pin with two ears and two radial antifriction bearings. Vertical hinge consists of axial hinge case and blade attachment adapter interconnected by vertical hinge pin. Radial elastomer bearings is composed of a set of concentric cylindrical alternating stiff and resilient washers, open on the blade side, with equal relative shear stress. Cover has the ledge extending inside opening of horizontal hinge pin. Stiff washers of axial thrust cylindrical elastomer bearings are shaped to cone with the base composed of flat ring conjugated with cone side surface, cone vertex having radius rounding.

EFFECT: longer life, decreased weight.

3 cl, 5 dwg