Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Nonmetallic resilient mounting
Patent
1983-03-22
1986-02-04
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Nonmetallic resilient mounting
416230, 416141, B64C 2738
Patent
active
045682453
ABSTRACT:
A composite helicopter rotor hub is described having a composite retention plate, yokes and torque tubes. The retention plate is made up of graphite and glass fiber reinforced epoxy resin. The graphite fiber reinforcement is in-plane isotropically laid continuous graphite fibers and the glass fiber reinforcement comprises segments of fiberglass continuously and circumferentially wound around the areas of retention. The yoke is made up of glass fibers unidirectionally oriented in the direction of principle stress, i.e., along the length of the yoke. The yoke also has clevis sections on either end and the clevis sections additionally contain multiaxially oriented multiple plies of unidirectionally oriented continuous graphite fibers interleaved with the unidirectionally oriented continuous glass fibers. The torque tube contains upper and lower load bearing surfaces connected by two sidewall portions. Both the sidewall and load bearing portions contain filament wound glass fiber reinforced epoxy resin such fibers having a .+-.45.degree. orientation. The upper and lower load bearing portions additionally contain multiaxially oriented multiple plies of unidirectionally oriented continuous graphite fibers interleaved with the glass fibers. The particular materials selected combined in the unique manner described provide the individual components as well as the entire hub assembly with crack resistance, damage tolerance, light weight, strength and integrity inspectability.
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Byrnes, Jr. Francis E.
Hibyan Edward S.
Ogle Peter C.
Toner Thomas J.
Wehnert George J.
Cohen Alan C.
Powell Jr. Everette A.
United Technologies Corporation
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