Rotor head for rotary wing aircraft

Details Rotor head for rotary wing aircraft Rotor head for rotary wing aircraft

1998-01-08

1998-12-29

Oberleitner, Robert J.

Aeronautics and astronautics

Aircraft, heavier-than-air

Helicopter or auto-rotating wing sustained, i.e., gyroplanes

244 1727, 416134A, 416138, 416141, 416148, B64C 2752

Patent

active

058531459

ABSTRACT:
A flexible beam rotor assembly for an aircraft includes a rotor spar having an axis of rotation and a hole through which the axis of rotation passes. A spindle has a teetering connection to the rotor spar, the teetering connection having a teetering axis above the rotor spar at the rotor axis of rotation. A spindle housing is nonrotatably mounted to the aircraft and rotatably receives the spindle. The spindle housing and spindle protrude through the hole in the rotor spar and are tiltable in response to pilot control on a left-right spindle pivot axis and a fore-aft spindle pivot axis. The left-right spindle pivot axis and the fore-aft spindle pivot axis are located below the teetering axis and above the rotor at the rotor axis of rotation. A pylon is pivotally mounted to the fuselage for fore and aft movement relative to the fuselage to absorb vibration due to rotation of the rotor during forward flight of the aircraft. The spindle housing is attached to the pylon by a universal joint. A pair of pylon arms are pivotally connected to a lower end of the pylon. A pair of pushrods are pivotally connected between the pylon arms and the spindle housing. The pylon, spindle housing, arms, and pushrods form a parallelogram which allows the spindle to move fore and aft to absorb vibration without changing spindle tilt.

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