Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Nonmetallic resilient mounting
Patent
1986-07-23
1988-05-24
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Nonmetallic resilient mounting
416141, B64C 2738
Patent
active
047462728
ABSTRACT:
The lag-torsion flexure portion (16) of a flexbeam (10) having segregated lag-torsion flexure portions (16) and flap flexure portions has multiple longitudinal lobes (98A-98G, 100A-100G) formed by multiple grooves (90A-90F, 92A-92F) extending from the upper (94) and lower (96) surfaces of the lag-torsion flexure portion to a central planar portion (102) thereof. The bases of the grooves are radiused (r) for favorable stress distribution while allowing for torsional and lead/lag softness in the lag-torsion flexure portion. The preferred number of grooves is an even number, such as six, resulting in an odd number of lobes. The lobes may decrease in height from the central lobe to the edgemost lobes (FIG. 12A). The lobes may be radiused at the upper and lower surfaces of the lag-torsion flexure portions (FIG. 12B). The lobes may be formed of alternate layers of unidirectional longitudinal fiber (32) extending the length of the flexbeam and elastomeric material (112) (FIG. 12D). Furthermore, the central planar portion (102) of the lag-torsion flexure portion may include layers (110) of fibers laid up at an angle to the unidirectional longitudinal fibers (FIG. 12C).
REFERENCES:
patent: 3669566 (1972-06-01), Bourquardez et al.
patent: 4008980 (1977-02-01), Noehren et al.
patent: 4037988 (1977-07-01), Laird
patent: 4299538 (1981-11-01), Ferris et al.
patent: 4323332 (1982-04-01), Fradenburgh
patent: 4352631 (1982-10-01), Buchs et al.
patent: 4381902 (1983-05-01), Head et al.
patent: 4427340 (1984-01-01), Metzger et al.
patent: 4455123 (1984-06-01), Sanders et al.
patent: 4650401 (1987-03-01), Yao et al.
"Will Rotors Lose Their Bearings?", G. Warwick, Flight International, Jun. 1985, pp. 30-35.
"On the Increasing Fracture Toughness at Increasing Notch Length of 0/90 and .+-.45/0 Graphite/Epoxy Laminates", P. W. M. Peters, Composites, vol. 14, No. 4, Oct. 1983, pp. 365-369.
"A Study on GRP Ski/Foam Core Sandwich Structures", S. K. Malhotra & B. J. C. Babu, Composites, vol. 14, No. 4, Oct. 1983, pp. 383-386.
"Hughes Flies Harp Rotor, Proposes AH-64B Upgrade", Rotor & Wing International/Aug. 1985, p. 62.
"Design Considerations for Bearingless Rotor Hubs", W. G. Bousman, R. A. Ormiston, & P. H. Mirick, Present, at 39th Annual Forum/American Helicopter Society, May 1983.
"Company Evaluates Bearingless Helicopter Main Rotor System", Aviation Week & Space Technology, Aug. 23, 1982, p. 63.
"What Can Bell's 680 Rotor Offer the LHX Pilot?", D. Green, Rotor & Wing International/May 1986, pp. 48-50 & 53.
Advertisement for Bell 680 Rotor, Aviation Week 8/12/85.
"Gust Response of Hingeless Rotors", G. S. Bir & I. Chopra, Journal of the American Helicopter Society, vol. 31, No. 2, Apr. 1986, pp. 33-46.
Byrnes Francis E.
Hibyan Edward S.
Noehren William L.
Linden Gerald E.
Powell Jr. Everette A.
Sapone William J.
United Technologies Corporation
LandOfFree
Lobed composite flexbeam does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lobed composite flexbeam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lobed composite flexbeam will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1056068