Fluid reaction surfaces (i.e. – impellers) – Sustained ancillary movement of rotary working member – Lead-lag type rotor blade movement
Patent
1998-09-24
2000-04-18
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Sustained ancillary movement of rotary working member
Lead-lag type rotor blade movement
416104, 416106, 416134A, 416140, 416141, 416230, 416244R, 416244D, 2988921, 29450, B64C 2751
Patent
active
060507780
ABSTRACT:
A semi-articulated stiff-in-plane (SASTIP) rotor hub is provided. The hub includes a cylindrical composite shell (12). A plurality of flexure mount assemblies (16) are positioned around the periphery of the hub shell. Each flexure mount assembly includes both an upper and a lower flexure (64), (66). The outboard ends of the upper and lower flexures attach to an outboard bearing support (34). The inboard end of each flexure is maintained within first and second clamp plates (76), (78) that are mounted within hub flexure openings (38), (40). The flexure clamp plates (76), (78) additionally attach circumferentially to annular CF rings (24), (26), (28), (30) positioned within the hub shell. A blade shaft (14) extends through the outboard bearing (72) and connects to a spindle. The spindle is supported by a spherical bearing that is mounted within the hub shell (12) at a circular spindle hole. The structural characteristics of each of the flexures are tailored to achieve desired differential spring rates to control both flapping and lead-lag displacements of the respective blades, as well as natural frequencies of the rotor.
REFERENCES:
patent: 5156527 (1992-10-01), Pancotti
patent: 5267833 (1993-12-01), Mouille
patent: 5542818 (1996-08-01), Monvaillier et al.
Griffith, Sr. Thomas W.
McArdle Francis H.
McArdle Helene G.
Peck John H.
Thompson George H.
Look Edward K.
McDowell Liam
The Boeing Company
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