초록 ▼

The convertible aircraft with tilting rotors comprises two fixed wings with zero sweep on which an inter-connecting shaft is substantially rectilinear and parallel with the pivot axis but offset from this axis, substantially perpendicular to a longitudinal axis of symmetry of the aircraft, the cente

The convertible aircraft with tilting rotors comprises two fixed wings with zero sweep on which an inter-connecting shaft is substantially rectilinear and parallel with the pivot axis but offset from this axis, substantially perpendicular to a longitudinal axis of symmetry of the aircraft, the center of gravity of which, in helicopter mode, is substantially in a vertical plane passing through the pivot axis and, in aeroplane mode, is substantially contained in or is in proximity to another vertical plane passing through the straight line of the aerodynamic centers of the wings.

대표청구항 ▼

[ What is claimed is:] [1.]1. A convertible aircraft with tilting rotors, which is capable of operating in aeroplane mode and in helicopter mode and comprising at least one fuselage, a fixed wing system comprising at least two wings extending laterally on either side of said fuselage, and, in helico

[ What is claimed is:] [1.]1. A convertible aircraft with tilting rotors, which is capable of operating in aeroplane mode and in helicopter mode and comprising at least one fuselage, a fixed wing system comprising at least two wings extending laterally on either side of said fuselage, and, in helicopter mode, a rotating wing system comprising at least two rotors which act as propellers in aeroplane mode, each of which is mounted so as to be tiltable about a pivot axis on a respective fixed wing and connected by a respective transmission to a respective engine supported by the corresponding wing, an inter-connecting shaft linking the two transmission gears in order to drive the two rotors in rotation by any one of the two engines should the other engine fail, each of the two transmissions having a pivoting reduction gear unit connected to a non-pivoting reduction gear unit, the pivoting reduction gear unit driving the corresponding rotor and being mounted so as to pivot with said rotor relative to the non-pivoting reduction gear unit, linked to said inter-connecting shaft and to said corresponding engine and fixed with said shaft and said engine on the fixed wings, wherein said fixed wings are zero-sweep wings, on each of which the inter-connecting shaft is substantially rectilinear and substantially parallel with the pivot axis but offset from said pivot axis substantially perpendicular to a longitudinal axis of symmetry of the aircraft, the center of gravity of which, in helicopter mode is substantially contained in a vertical plane passing through the pivot axis whilst in aeroplane mode, the center of gravity of the aircraft is substantially contained in or in proximity to another vertical plane passing through the straight line of the aerodynamic centers of the zero-sweep wings, wherein the pivoting reduction gear unit of each transmission is arranged in a main helicopter gearbox, comprising an output reduction gear stage linked to the shaft of the corresponding rotor, and an input reduction gear stage, of the conical ring frame type, in which a conical input gear thereof is coaxial with a pivot gear which pivots about the pivot axis and is joined with said pivot gear in rotation in at least one direction of rotation, the non-pivoting reduction gear unit of each transmission being arranged in an intermediate gearbox comprising a high speed reduction gear stage, having a conical ring frame, the conical input gear of which is linked to an output shaft of the corresponding engine, and an intermediate reduction gear stage meshing with the pivot gear and with the high speed reduction gear stage, and linked to the inter-connecting shaft by a respective power takeoff on the corresponding wing, said intermediate reduction gear stage leaving sufficient space free between the pivoting reduction gear unit and the intermediate gearbox to allow the pivoting reduction gear unit to pivot with the rotor about the pivot axis without interfering with the intermediate gearbox or any other non-pivoting component of the aircraft.