SYSTEME DE PROPULSION D'AERONEF ET PROCEDE DE FABRICATION D'UN ORGANE DE CE SYSTEME

L'invention concerne les moteurs d'aéronef.Dans un système de propulsion d'aéronef, un anneau de support de pales d'hélice entoure un rotor, tel qu'une turbine. Une bande métallique formant une frette 50 est enroulée en plusieurs couches autour de l'anneau pour éviter une déformation importante de ce dernier en cas de rupture accidentelle de l'une des barres 29 qui le constituent.Applications aux moteurs à soufflante non carénée. PURPOSE: To improve safety by a method wherein a hoop stress during operation is received by a ring surrounding a rotor and maintaining a plurality of propeller blades and a device is provided to receive a part of the hoop stress when the ring is broken. CONSTITUTION: Tension is applied on a polygonal ring 29, receiving the centrifugal load of a fan blade as a hoop stress, through the centrifugal load of a blade. A pair of parallel bands 50 are attached to the periphery of the polygonal ring 29. When a crack 53 occurs to one of the rails 29, which is broken, the band 50 receives most of a hoop stress, heretofore supporting a rail, in substitution. It is suppressed that wide deformation of a broken rail occurs to an imaginary rail 29PH, and the rail 29 having no damage prevents inducing of a torsional stress to break sound rails 29. This constitution, even when a ring is broken, maintains a blade pitch and performs safety operation.