Mid-turbine frame with tensioned spokes

摘要

A mid-turbine frame located in a gas turbine engine axially aft of a high-pressure turbine and fore of a low-pressure turbine includes an outer frame case, an inner frame case, and at least a first spoke connecting the outer frame case to the inner frame case. The first spoke is tightened so as to be in tension during substantially all operating conditions of the gas turbine engine.

主权项

1. A gas turbine engine comprising:
a combustor; a first turbine section in fluid communication with the combustor; a second turbine section in fluid communication with the first turbine section; and a mid-turbine frame located axially between the first turbine section and the second turbine section, the mid-turbine frame comprising:
an outer frame case;an inner frame case; andat least a first spoke connecting the outer frame case to the inner frame case, wherein the first spoke is tightened so as to be in tension during substantially all operating conditions of the gas turbine engine; and
wherein the first spoke comprises:
a tie rod having a first threaded surface at a first end;a first retaining nut having a second threaded surface engaged with the first threaded surface;a third threaded surface at a second end of the tie rod opposite the first end; anda second retaining nut having a fourth threaded surface engaged with the third threaded surface.