Pretensioned frame

Details Pretensioned frame Pretensioned frame

F - Mech Eng,Light,Heat,Weapons

01

D

170/62

F01D 25/24 (2006.01) F02C 7/20 (2006.01)

Patent

CA 2034470

Abstract An improved lightweight frame for gas turbine engine is disclosed. The frame includes a hub and a radially spaced casing with two rows of circumferentially spaced tie rods extending between the hub and the casing. In a preferred embodiment, jam nuts are provided on the tie rods for accommodating compressive loads therein. The tie rods are pretensioned so that during operation in a gas turbine engine, for example, wherein the tie rods are heated by combustion gases, thermal expansion of the tie rods and resulting compressive stress will be accommodated by the pretension so that in a preferredembodiment the tie rods may operate nearly stress free at normal operation. The two rows of tie rods and jam nut pairs allow the frame to accommodate effectively blade-out loads channeled to the frame 30.

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