Importance

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Abstract

A controlled collapse stub shaft allows controlled axial-movement of a mainline shaft joining a fan or compressor to a turbine. A first end of the stub shaft is joined to the mainline shaft. A second end of the stub shaft is joined to an engine part axially stationary relative to the mainline shaft controlled axial-movement. The stub shaft has an annular-body between first and second ends. The body contains plurality of axially-spaced circumferential rows of circumferentially-extending slots, inter-slot ligaments formed between each row slots. Successive rows are offset. The ligaments of the axially forwardmost and rearwardmost rows excepted, each ligament sandwiched between forward and rearward slots of neighbouring rows. Each ligament joined to adjacent ligaments of neighbouring rows by circumferentially-extending bars having thickness in axial direction corresponding to axial spacing between rows. The bars are axially-deflectable allowing the axial-distance between first and second ends of the stub shaft to decrease.

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First Claim