Flapping restrainer device for rotorcraft rotor blades, and roto

Details Flapping restrainer device for rotorcraft rotor blades, and roto Flapping restrainer device for rotorcraft rotor blades, and roto

1989-09-22

1991-04-16

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Sustained ancillary movement of rotary working member

Lead-lag type rotor blade movement

416107, 416131, 416140, F01D 300

Patent

active

050077996

ABSTRACT:
The invention relates to a flapping restrainer device for the blades of a rotorcraft main rotor, and a rotor head comprising the same. The lower restrainers comprise a reciprocal star-shaped plate (32), having as many radial branches (33) as blades, and each one of the branches being engaged into a radial opening (6) of the hub (3). Outside the latter, the star-shaped plate (32) cooperates with supporting runners (47) integral with the blades. The upper restrainers comprise, for each blade, a stop which is retractable by the effect of the centrifugal force and which is composed of a lever (52), pivoting on a pivot (53) carried by the hub (3), and a first arm (55) of which constitutes a stop finger directed towards an upper supporting component (60) integral with the blade, while a second arm (56) carries a governor weight (57) and a nose (58) for support against a shoulder (59) integral with the hub (3).

REFERENCES:
patent: 2640584 (1953-06-01), Campbell
patent: 3147810 (1964-09-01), Mosinskis
patent: 3591310 (1971-07-01), Mouille
patent: 3923419 (1975-12-01), Mouille
patent: 4178130 (1979-12-01), Ferrris et al.
patent: 4369019 (1983-01-01), Lovera et al.
patent: 4808075 (1989-02-01), Pariani et al.

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