Fluid reaction surfaces (i.e. – impellers) – Sustained ancillary movement of rotary working member – Lead-lag type rotor blade movement
Patent
1993-02-04
1994-12-13
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Sustained ancillary movement of rotary working member
Lead-lag type rotor blade movement
416107, 416140, B64C 2751
Patent
active
053724780
ABSTRACT:
A hollow rotor hub is provided at the top of the rotor shaft for a multi-bladed helicopter. The blades being mounted to the rotor hub on spherical elastomeric bearings which provide for coincident rotor blade hinges for blade pitch, flap and lead-lag motions. The invention discloses a lead-lag damper contained in a housing at the center of the hollow rotor hub. The damper consists of a series of damping plates, each plate being connected to one of the rotor blades. The damping plates are separated from each other and from the damper housing by elastomeric layers bonded to the plates and to the housing. Lead-lag damping is provided by the shear in the elastomeric layers. The damper may be fastened to the air frame in a conventional manner, it may be mounted on a spindle for rotation about the rotor axis independent of rotor shaft rotation or may be free-floating and attached only to the rotor blades and not to the rotor shaft. With suitable selection of elastomeric damping material properties, it can provide blade to hub damping, blade to blade damping or combinations thereof.
REFERENCES:
patent: 1925071 (1933-08-01), Griswold
patent: 1925072 (1933-08-01), Griswold
patent: 3842945 (1974-10-01), Potter
patent: 4249862 (1981-02-01), Waddington
patent: 4297078 (1981-10-01), Martin
patent: 4504193 (1985-03-01), Mouille
patent: 4575358 (1986-03-01), Ferris
patent: 4580945 (1986-04-01), Miller
patent: 4588356 (1986-05-01), Pariani
patent: 5007799 (1991-04-01), Mouille et al.
Look Edward K.
Sgantzos Mark
The Boeing Company
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