Compound hub spring system for helicopters

Details Compound hub spring system for helicopters Compound hub spring system for helicopters

1979-08-29

1982-06-08

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

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

Nonmetallic resilient mounting

416140, 416148, B64C 2752

Patent

active

043337287

ABSTRACT:
A system for opposing helicopter blade flapping applies restraining forces at a low spring rate at low flap angles and at a high spring rate at flap angles greater than a predetermined angle. More particularly, bearings rotatably support the blade yoke on rotor hub trunnions which form a flapping axis. A resilient mechanical coupling between the blade yokes and the hub trunnion applies a restraining force having a characteristic linear with flapping angle. A second restraint mounted to rotate about the flapping axis with the rotor, applies a nonlinear restraining force which preferably rapidly increases beginning at a predetermined flap angle, and over the range short of hard flapping contact between the rotor and the rotor mast.

REFERENCES:
patent: 2640553 (1953-06-01), Hafner
patent: 2949965 (1960-08-01), DeTore et al.
patent: 3288226 (1966-11-01), Lemont et al.
patent: 3378083 (1968-04-01), Lichten et al.
patent: 3790302 (1974-02-01), Pascher
patent: 3804552 (1974-04-01), Corington
patent: 3807896 (1974-04-01), Johnson
patent: 3912199 (1975-10-01), Seibel et al.

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