Aircraft engine coupling

192 clutches and power-stop control – Clutches – Automatic

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Details

192 56F, 192 91A, 192104F, 192114R, F16D 4320, F16D 4100, F16D 43284

Patent

active

039970426

ABSTRACT:
A torque responsive coupling includes an intermediate coupling member with helical splines thereon selectively engageable with first and second axially spaced helically splined coupling discs connected respectively to an engine power shaft and to a gear reduction input shaft to a propeller. Each of the coupling disc splines is maintained in engagement with the splined portions of the intermediate coupling member by spring means to transmit power from the engine shaft to the propeller and the intermediate coupling member is responsive to a high negative torque from the propeller when the engine fails to shift axially to separate spline teeth for decoupling the engine shaft and propeller and cause a hydraulic lockout system to apply a force on the intermediate coupling member in opposition to the spring means to maintain the spline teeth decoupled to prevent ratcheting therebetween; the hydraulic lockout system includes a single piston unit indexed to control pressure balance ports and an exhaust valve for establishing the opposition force.

REFERENCES:
patent: 2683512 (1954-07-01), Boice
patent: 2700443 (1955-01-01), Boice
patent: 3205986 (1965-09-01), Kramer
patent: 3225876 (1965-12-01), Dison
patent: 3249187 (1966-05-01), McDowall
patent: 3713518 (1973-01-01), Hawkins

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