Rotary, viscoelastic drag elastic-return and damping device for

Details Rotary, viscoelastic drag elastic-return and damping device for Rotary, viscoelastic drag elastic-return and damping device for

1990-10-19

1992-08-25

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Sustained ancillary movement of rotary working member

Lead-lag type rotor blade movement

416140, B64C 2751

Patent

active

051413981

ABSTRACT:
The invention relates to a drag elastic-return and damping device (28) for a blade, and a rotor head including it.
The device (28) comprises a connecting rod (30) connected to the blade and transmitting its drag movements to a rotary member (29) for elastic return with incorporated damping whose outer armature (32) it causes to rotate about a coaxial inner armature (31) in order to shear at least one thin collar (33) of a viscoelastic elastomer about its axis (B). The connecting rod (30) is coupled by way of rotational joints (43, 44) to a sleeve (15) for attaching the blade to the hub (1), and to a lever (34) of the outer armature (32). The member (29) is supported at the periphery of the hub (1), between two adjacent blades, or in the sleeve for attaching an adjacent blade such that the corresponding connecting rod is mounted as an inter-blade tie. On the rotor head, each blade is articulated with the hub (1) by a spherical laminated thrust block (5).

REFERENCES:
patent: 2155427 (1939-04-01), Larsen
patent: 2516781 (1950-07-01), Magrum-O'Connor
patent: 2696271 (1954-12-01), Jovanovich
patent: 3758230 (1973-09-01), Potter
patent: 4293277 (1981-10-01), Aubry
patent: 4304525 (1981-12-01), Mouille
patent: 4494738 (1985-01-01), Britton et al.
patent: 4549850 (1985-10-01), Vincent
patent: 4915585 (1990-04-01), Guimbal
patent: 5007799 (1991-04-01), Mouille et al.

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