Main transmission gearbox for a twin-engined helicopter

Details Main transmission gearbox for a twin-engined helicopter Main transmission gearbox for a twin-engined helicopter

1985-07-24

1989-03-14

Herrmann, Allan D.

Machine element or mechanism

Gearing

Plural power paths to and/or from gearing

74665E, 74675, F16H 3706

Patent

active

048116270

ABSTRACT:
In a main transmission gearbox for a helicopter having two engines, a lifting rotor and an anti-torque rotor, each of the two engines drives a main kinematic chain comprising from upstream down, an input shaft, a twistable shaft, a gear train forming a first reduction stage having a first bevel pinion meshing with a second bevel pinion which drives in rotation a vertical shaft bearing having a third pinion in mesh with a gearwheel which is common to the two main chains and forms with the third pinions a second reduction stage. The torque received at the gearwheel is transmitted to the driving shaft of the main rotor by way of a supplementary reduction stage of epicyclic type. A third chain comprising two input pinions each of which is mounted upon one of the input shafts and an intermediate pinion which drives the driving shaft of the anti-torque rotor, ensures the distribution of power over the two main chains in the event of breakdown of one engine.

REFERENCES:
patent: 3129608 (1964-04-01), Watson
patent: 3255625 (1966-06-01), Mouille et al.
patent: 3545296 (1970-12-01), Eggins
patent: 3564937 (1971-02-01), Soloviev et al.
patent: 3782223 (1974-01-01), Watson
patent: 4479619 (1984-10-01), Saunders et al.
patent: 4489625 (1984-12-01), White

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