Helicopter power transmission systems

Details Helicopter power transmission systems Helicopter power transmission systems

1975-01-31

1976-08-31

Blix, Trygve M.

Aeronautics and astronautics

Aircraft power plants

Transmission of power

74661, 416170R, B64C 2712, B64D 3508

Patent

active

039776328

ABSTRACT:
This invention relates to power transmission systems for helicopters having two or more engines, the transmission system comprising for each engine, drive shafting and gearing including a final drive gear for transmitting torque from each engine to a common output gear for connection to the rotor system, and an idler gear interconnecting the respective gearings to distribute available torque amongst the full complement of final drive gears. A particular embodiment is shown and described for a twin-engined helicopter in which an additional final drive gear is meshed with the output gear and driven from the idler gear so that, even in the event of an engine failure the available torque from the remaining engine is transmitted through all three final drive gears to the rotor system. In the particular embodiment the drive to the additional final drive gear is also arranged for connection to a tail rotor.

REFERENCES:
patent: 3129608 (1964-04-01), Watson
patent: 3255825 (1966-06-01), Moville et al.
patent: 3782223 (1974-01-01), Watson
"Design of a Lightweight Split Power Transmission for a 4000-HP Helicopter," G. White, Instn. Mech. Engrs., 1972 Conference, 5-6, Sept., 1972, see p. 125, paragraph 2.2.

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