STIFF-IN-PLANE ROTOR CONFIGURATION

摘要

A rotor assembly for a rotary-wing aircraft, the rotor having a central hub assembly with a flexure-type, twist-shank yoke with multiple arms, each arm being adapted for a rotor blade to be mounted thereto. The arms provide for pitch changes of blades attached to the yoke through twisting of portions of the arms about a corresponding pitch axis. An inboard pitch bearing associated with each arm is attached to the hub assembly and allows for rotation of the attached blade about the pitch axis, the inboard pitch bearing also allowing for out-of-plane motion of the arm relative to the hub assembly about a flapping axis. An outboard pitch bearing associated with each arm is attached to the associated arm a selected distance from the inboard pitch bearing and allows for rotation of the attached blade about the pitch axis.

主权项

1. A rotor assembly for a rotary-wing aircraft, the rotor comprising:
a central hub assembly having a flexure-type, twist-shank yoke with multiple arms, each arm being adapted for a rotor blade to be mounted thereto, the arms providing for pitch changes of blades attached to the yoke through twisting of portions of the arms about a corresponding pitch axis; an inboard pitch bearing associated with each arm, the inboard pitch bearing being attached to the hub assembly and allowing for rotation of the attached blade about the pitch axis, the inboard pitch bearing also allowing for out-of-plane motion of the arm relative to the hub assembly about a flapping axis; and an outboard pitch bearing associated with each arm, the outboard pitch bearing being attached to the associated arm a selected distance from the inboard pitch bearing and allowing for rotation of the attached blade about the pitch axis.