초록 ▼

A connecting element having end regions (22, 23) joined by an intermediate by an intermediate region (26) is constructed of a plurality of fibre filaments extending longitudinally and continuously throughout its length. The fibers in the end regions are embedded in a thermo-setting resin matrix mate

A connecting element having end regions (22, 23) joined by an intermediate by an intermediate region (26) is constructed of a plurality of fibre filaments extending longitudinally and continuously throughout its length. The fibers in the end regions are embedded in a thermo-setting resin matrix material and the fibres in the intermediate region are embedded in a resilient matrix material thereby permitting relative resilient torsional movement of the end regions about a longitudinal axis. Such a connecting element is particularly suited for use in a helicopter rotor and several embodiments are described and illustrated. In all embodiments the torsional flexibility of intermediate region (26) provides for blade feathering movements and in a preferred embodiment the inner end region (22) is constructed so as to be resiliently flexible in a blade flap plane and the outer end region (23) is constructed so as to be equally resiliently flexible in the blade flap and lead/lag planes.

대표청구항 ▼

A helicopter rotor having a rotor hub and a plurality of radially extending rotor blades and including, for each blade, an elongate connecting element constructed of a plurality of individual fibre filaments extending longitudinally and substantially continuously throughout its length and including

A helicopter rotor having a rotor hub and a plurality of radially extending rotor blades and including, for each blade, an elongate connecting element constructed of a plurality of individual fibre filaments extending longitudinally and substantially continuously throughout its length and including an inner and outer end regions wherein said filaments are embedded in a resin matrix material and an intermediate region wherein said filaments are embedded in a resilient elastomer matrix material, said inner end region extending from the rotor hub and adapted to be resiliently flexible in a blade flap plane, and blade pitch change means rotationally fixed to the outer end region and adapted during operation to twist the outer end region relative the inner end region to effect blade pitch changes.