Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Nonmetallic resilient mounting
Patent
1992-01-27
1994-02-15
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Nonmetallic resilient mounting
416135, 416141, B64C 2733
Patent
active
052861678
ABSTRACT:
A flexbeam helicopter rotor having an improved connection between the flexbeam and the hub of the connecting pin variety but in which the high tensile fibers of the flexbeam do not wrap around the connecting pin, wherein the blade centrifugal loads and the blade lead-lag loads are reacted by the connecting pin at a station where it passes through drilled holes in the flexbeam inner end, and wherein the blade flapping motion imposed loads are reacted through two load paths in the flexbeam-to-hub connection, the first load path being created by a prying reaction between the flexbeam and the hub connecting flanges, and the second load path being created by the differential bending reaction between the flexbeam at the station of the drilled holes and the connecting bolts. Further, there is apparatus to decouple the loads and decrease the maximum load in at least one of the load paths created by the aforementioned prying reaction and the aforementioned bending reaction so that they are substantially spaced along the flexbeam axis of rotation from each other to thereby permit the use of a minimum thickness flexbeam, and gain the attended advantage of reduced rotor weight and size, and which flexbeam-to-hub connection has the additional advantage of a reduced flapping hinge effecting offset, or flapping axis, from the prior art type of connection.
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Sikorsky Aircraft, Bearingless Rotor, Aug. 28, 1980.
Development of a Bearingless Helicopter TailRotor, 1981.
Byrnes Francis E.
Schmaling David N.
Hauschild Vernon F.
Larson James A.
Look Edward K.
United Technologies Corporation
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