Flat strap cruciform flexure for helicopter rotor systems
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United States of America Patent
Stats
-
Mar 17, 1987
Grant Date -
N/A
app pub date -
Apr 7, 1983
filing date -
Apr 7, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved flexure member in a helicopter rotary system is devised wherein the flexure member is made of wound monofilamentary resin impregnated material comprising a fiber matrix and is formed in a flat strap disposed through a rotary hub of the rotor system and integrally extends from the flat strap to form a transition member and then to a cruciform flexure member having an X-shaped cross section. The cruciform member then extends and attaches to an outboard fitting adapted for coupling to the root of a rotor blade. In one embodiment the fiber matrix is wound around cylindrical lugs which forms the outboard fitting in combination with the integral extension of the cruciform member. The cruciform member is particularly characterized by including a woven X-shaped reinforcing fabric disposed within the X-shaped member about which fabric the monofilamentary layers are formed thereby forming each leg of the X-shaped cruciform. The woven reinforcing fabric extends through the center of the X-shaped cross section while the filamentary layers are disposed adjacent only to the legs of the X-shaped cruciform member, thus leaving the center of the X-shaped cruciform member thinned but knitted together by the reinforcing fabric.
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