Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Including movement limit stop or damping means
Patent
1976-10-04
1978-12-26
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Including movement limit stop or damping means
416146A, 416148, B64C 2736
Patent
active
041313917
ABSTRACT:
An improved rotor hub and seal assembly for a rotor-craft such as a helicopter includes an improved tri-hinge rotor and an improved oil seal assembly for the rotor pitch bearings. The rotor blades are mounted to the underslung hub by coning hinges, offset from the teetering hinge to which the rotor shaft is attached, so that the stabilizing centrifugal force is always greater than the destabilizing moments. The rotor also includes a teeter hinge restraint, while the oil pitch bearings are sealed by a boot-type seal to permit angular movement of the outer blade root housing relative to the bearing spindle resulting in shear rather than tension on the boot.
REFERENCES:
patent: 3942910 (1976-03-01), Snyder et al.
patent: 3967918 (1976-07-01), Mouille et al.
Powell Jr. Everette A.
Robinson Helicopter Co.
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