Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1985-08-07
1987-04-28
Braun, Leslie
Machine element or mechanism
Gearing
Plural power paths to and/or from gearing
74679, 74714, 74766, 416152, 416170R, 416160, F16H 3706, F16H 3700
Patent
active
046604375
ABSTRACT:
An apparatus for controlling pitch variations of the blades of a propeller. A first planetary gearset includes a sun gear, a ring gear and at least one planetary gear meshed with the sun and ring gears, the sun gear being statically grounded. A second planetary gearset is stacked in concentric juxtaposition with the first planetary gearset and includes a sun gear, a ring gear and at least one planetary gear meshed with the sun and ring gears. The planetary gears of the respective gear sets are coupled for conjoint orbiting about their respective sun gears. A main rotor drive input is coupled to the ring gear of the second planetary gearset. A blade actuator output is coupled to the ring gear of the first planetary gearset to be rotated thereby. A selectively operable differential drive input is coupled to the sun gear of the second planetary gearset, whereby inoperation of the differential drive input effectively grounds the sun gear and permits the main rotor drive input and the blade actuator output to rotate at the same speed. Selective operation of the differential drive input to rotate the sun gear of the second planetary gearset effects a differential speed between the rotor drive input and the blade actuator output.
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Belisario Martin G.
Braun Leslie
Sundstrand Corporation
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