초록 ▼

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 st

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.

대표청구항 ▼

An improvement in a flexure member in a rotary blade system including a plurality of blades comprising: a rotor hub; a flat strap disposed through said rotor hub and extending thereform; a transition member extending from said flat strap and having a cross-sectional configuration on a first end ther

An improvement in a flexure member in a rotary blade system including a plurality of blades comprising: a rotor hub; a flat strap disposed through said rotor hub and extending thereform; a transition member extending from said flat strap and having a cross-sectional configuration on a first end thereof substantially identical to said flat strap where said transition member and flat strap are adjacent; a cruciform member extending from said transition member at a second end of said transition member opposing said first end of said transition member, said cruciform member having a cross-sectional configuration characterized by a plurality of intersecting planes, said cruciform member including an intergral, nonshear bearing reinforcing fabric member disposed therein such that in cross-sectional configuration said reinforcing member is disposed therein at least at the point of intersection of said intersecting planes and is parallel and is disposed in at least part of each of said planes, said cruciform member extending from said transition member; and an outboard fixture means connected to said cruciform member for providing attachment to said blades of said rotary blade system, whereby an improved flexure member is provided which is characterised by high reliability, and improved performance and flexibility.