Machine element or mechanism – Gearing – Directly cooperating gears
Patent
1987-09-30
1990-04-03
Aschenbrenner, Peter A.
Machine element or mechanism
Gearing
Directly cooperating gears
244 1725, B64C 2706
Patent
active
049129996
ABSTRACT:
The transmission, rotor and upper controls of a helicopter are supported on a roll housing mounted for pivotal rotation about the roll axis and on a pitch housing carried on the roll housing for pivotal rotation about the pitch axis. The roll housing carries a lower ring gear which meshes with an input shaft driven by an engine. The pitch housing carries side pinions, which mesh with the lower ring gear, and an upper ring gear, which meshes with the side pinions. A planetary gearset located in the upper transmissions cover includes a sun gear carried on the upper ring gear, a planet pinion carrier driveably connected to an output shaft, a set of planet pinions meshing with the sun gear and a stationary ring gear meshing with the planet pinions. The output shaft drives the rotor, rotor blades and rotating controls. Dampers restrain pivotal movement of the roll housing and pitch housing and pitch housing with respect to the fuselage.
REFERENCES:
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patent: 3463029 (1969-08-01), Chow
patent: 3514054 (1970-05-01), Mard et al.
patent: 3921939 (1975-11-01), Garfinkle
patent: 4358243 (1982-11-01), Heath
patent: 4499790 (1985-02-01), Helms
patent: 4720059 (1988-01-01), Stearns, Jr.
Franks Robert S.
Perillo Vincent J.
Aschenbrenner Peter A.
The Boeing Company
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