Adjustment means for helicopter rotor blade viscous damper

Details Adjustment means for helicopter rotor blade viscous damper Adjustment means for helicopter rotor blade viscous damper

1991-03-05

1992-05-26

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Including movement limit stop or damping means

416106, 188290, B64C 2751, F16D 5700

Patent

active

051162016

ABSTRACT:
A viscous damper for a helicopter rotor blade having a stator member and a rotor member each having a plurality of flanges of different diameter defining cylindrical internal and external shear surfaces, respectfully, and a shear gap therebetween, one stator member internal shear surface having two diameters, the shear gap distances between proportional to radius, and a coaxial rotor member comprising two discs having outer cylindrical shaped shear suraces forming a shear gap with adjacent stator member shear surfaces and one rotor disc being axially movable so that a variable portion of its shear surface is opposite both of the diameters of the stator member two-diameter internal shear surface.

REFERENCES:
patent: 2853141 (1958-09-01), Leoni
patent: 2881868 (1959-04-01), Frykman
patent: 3119469 (1964-01-01), Farr et al.
patent: 3536175 (1970-10-01), Kawabe et al.
patent: 3907079 (1975-09-01), Chapman
patent: 4576252 (1986-03-01), Omata
patent: 4691811 (1987-09-01), Arakawa et al.
patent: 4908905 (1990-03-01), Kanno et al.

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