Dynamic stability and mid axial preload control for a tie shaft coupled axial high pressure rotor

摘要

A middle support member is used to provide axial support and control to the tie shaft. The middle support member includes a high pressure compressor coupling nut that applies a preload that allows the high pressure compressor stack to be installed separately from the high pressure turbine rotor through a kickstand.

主权项

1. A turbine engine, comprising:
a first bearing on a first end of a unitary tie shaft; an upstream hub threadably engaged with the tie shaft; a compressor rotor stack supported by and operatively associated with the tie shaft and abutting the upstream hub; a middle support member abutting the compressor rotor stack, the middle support member having a downstream hub and a soft spring kickstand; a high pressure compressor coupling nut abutting the soft spring kickstand and threadably engaged with the tie shaft; a turbine rotor stack operatively associated with the tie shaft and abutting the downstream hub; a turbine rotor arm operatively associated with the turbine rotor stack and interferingly fitting with the tie shaft; a high pressure turbine lock nut threadably engaged with the tie shaft and abutting the turbine rotor arm; an intermediary sleeve interferingly fitting with the turbine rotor arm; a second bearing having inner and outer races, the inner race interferingly fitting with an outside diameter of the intermediary sleeve; and a downstream lock nut threadably engaged with the tie shaft and abutting the high pressure turbine lock nut.