Assembly and method preventing tie shaft unwinding

摘要

A gas turbine engine has a plurality of compressor rotors, as well as a plurality of turbine rotors. A tie shaft of the engine is constrained to rotate with the compressor and turbine rotors during normal operating conditions. Further, an upstream hub is in threaded engagement with the tie shaft. The threads of the upstream hub are handed in a first manner when viewed from an upstream location. A downstream abutment member is positioned downstream of the turbine rotors and is also in threaded engagement with the tie shaft. Threads of the downstream abutment member are handed in the first manner when viewed from a downstream location. Accordingly, the compressor and turbine sections of the engine are reliably held together, and the tie shaft is substantially prevented from unwinding.

主权项

1. A gas turbine engine comprising:
a plurality of compressor rotors; a plurality of turbine rotors; a tie shaft, the compressor and turbine rotors being constrained to rotate with the tie shaft in a normal operating condition; an upstream hub located upstream of the compressor rotors, the upstream hub in threaded engagement with the tie shaft, threads of the upstream hub handed in a first manner when viewed from an upstream location; and a downstream abutment member located downstream of the turbine rotors, the downstream abutment member in threaded engagement with the tie shaft, threads of the downstream abutment member handed in the first manner when viewed from a downstream location; wherein the tie shaft includes a first set of threads corresponding to the threads of the upstream hub and a second set of threads corresponding to the threads of the downstream abutment member, and wherein threads of the upstream hub, the threads of the downstream abutment member, and the first and second sets of threads each include load flanks and clearance flanks; wherein, when in an initial assembled condition, the load flanks of the upstream hub contact the load flanks of the first set of threads, and the load flanks of the downstream abutment member contact the load flanks of the second set of threads; and wherein, when in an attempted unwinding condition, the load flanks of the upstream hub contact the load flanks of the first set of threads, and the clearance flanks of the downstream abutment member contact the clearance flanks of the second set of threads.