Stub shaft
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United States of America Patent
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Apr 10, 2018
Issued Date -
N/A
app pub date -
Apr 16, 2015
filing date -
May 8, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A controlled collapse stub shaft is provided for allowing controlled axial movement of a mainline shaft which joins a fan or compressor to a turbine of a gas turbine engine. A first end of the stub shaft is adapted to be joined to the mainline shaft. A second end of the stub shaft is adapted to be joined to a part of the engine which is axially stationary relative to the controlled axial movement of the mainline shaft. The stub shaft further has an annular body between the first and second ends. The body contains a plurality of axially-spaced circumferential rows of circumferentially-extending slots, inter-slot ligaments being formed between the slots of each row. Successive rows are offset. In this way, the ligaments of the axially forwardmost and rearwardmost rows excepted, each ligament is sandwiched between a forward slot and a rearward slot of its neighboring rows. Further, each ligament is joined to adjacent ligaments of its neighboring rows by circumferentially-extending bars having a thickness in the axial direction corresponding to the axial spacing between the rows. The bars are axially deflectable to allow the axial distance between the first and second ends of the stub shaft to decrease.
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