Patent ID: 7452188
Filing Date: 2008-11-18
Classification: F01D,F05B

Abstract:
1. A tie-bolt assembly for securing a rotor in a gas turbine engine, the tie-bolt assembly comprising: an engine main shaft; a rotor mounted about the main shaft, the rotor having a central bore therethrough; a tie-bolt mounted to the main shaft, the tie-bolt having an elongated tubular portion having a first and a second end, the first end mounted to the main shaft, the elongated portion extending through the central bore, the tie-bolt having a retaining portion having a first and a second end, the first end of the retaining portion being unitary with the second end of the tubular portion, the retaining portion having an outer diameter larger than that of the tubular portion; an annular spacer removably provided between the retaining portion and the rotor; and wherein the tie-bolt is in an axial-pretension condition when mounted to the rotor and wherein said pretension at least partially maintains the annular spacer between the retaining portion and the rotor.