High pressure gas generator rotor tie rod system for gas turbine engine

A high pressure gas generator rotor for a gas turbine engine comprising:

• a compressor rotor comprising:
• at least a first axial flow compressor stage and a last centrifugal flow compressor stage connected in rotational driving engagement thereto;
• a compressor rotor bore portion;
• and
• a compressor rotor axis of rotation;
• a turbine rotor comprising:
• at least a last turbine stage;
• a turbine rotor bore portion;
• and
• a common axis of rotation with said compressor rotor, said turbine rotor being connected in rotational driving engagement thereto;
• and
• a tie rod of unitary construction disposed through respective bore portions of said compressor and turbine rotors, aligned concentrically about said axis of rotation, said tie rod comprising:
• means for releasably attaching a first end of said tie rod to said first axial flow compressor stage;
• means for applying an interim compressive load through said last centrifugal flow compressor stage for preventing axial disengagement of said first axial flow compressor stage and said last centrifugal flow compressor stage of said compressor rotor;
• and
• means for applying a final compressive load through both said compressor and turbine rotors whereby application of said final compressive load releases loading of said compressor rotor through said interim load means.