HELICOPTER GIMBAL ROTOR

摘要

Rotor tilt is permitted by two spherical elastomeric bearings (32,34) one above a hub member (28) and one below, that have coincident centers at a tilt point (P) on the rotorshaft axis which is below the rotor plane. Positive rotor thrust is reacted by the upper bearing (32) and negative rotor thrust is reacted by the lower bearing (34). Techniques for assembling the rotor system, precompressing the bearings, and limiting tilt are also disclosed.