Braided spar for a rotor blade and method of manufacture...

Details Braided spar for a rotor blade and method of manufacture... Braided spar for a rotor blade and method of manufacture...

B - Operations, Transporting

64

C

B64C 27/473 (2006.01)

Patent

CA 2536668

A braided rotor blade spar includes a tri-axle braid in which braided bias angled fibers are located non-parallel to a longitudinal axis of the spar. Zero degree fibers are located parallel to the axis and are positioned to be on the upper and lower surfaces of the spar. The bias angle fibers are braided around the zero degree fibers. In a method of manufacture of the braided spar, a braided sleeve is formed dry over a mandrel by a multi-axial braiding machine. Once the braided sleeve is formed upon the mandrel, the mandrel is located within a matched metal mold, resin impregnated, and cured. The mandrel is then removed from the finished braided spar.

La présente invention se rapporte à un longeron tressé pour pale de rotor comprenant une tresse à trois axes dans laquelle des fibres inclinées sollicitées par la tresse sont disposées de manière non parallèle à un axe longitudinal du longeron. Des fibres à inclinaison zéro sont disposées en parallèle à l'axe et positionnées de manière à se trouver sur les surfaces supérieure et inférieure du longeron. Les fibres inclinées sollicitées sont tressées autour des fibres à inclinaison zéro. Dans un procédé de fabrication du longeron tressé, un manchon tressé est formé à sec au-dessus d'un mandrin par une machine à tresser multi-axiale. Une fois que le manchon tressé est formé sur le mandrin, ce dernier est disposé à l'intérieur d'un moule métallique adapté, imprégné de résine et réticulé. Le mandrin est ensuite retiré du longeron tressé fini.

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