Pretensioned frame

Details Pretensioned frame Pretensioned frame

1990-04-02

1991-12-31

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

60 3932, 415138, 415142, F02C 720

Patent

active

050760491

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 preferred embodiment 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.

REFERENCES:
patent: 2928648 (1960-03-01), Haines et al.
patent: 2938336 (1960-05-01), Peterson
patent: 4055041 (1977-10-01), Adamson et al.
patent: 4142365 (1979-03-01), Sargisson et al.
patent: 4249859 (1981-02-01), Benyi, Jr. et al.
patent: 4458863 (1984-07-01), Smith
patent: 4478551 (1984-10-01), Honeycutt et al.
patent: 4492078 (1985-01-01), Williamson
patent: 4571936 (1986-02-01), Nash et al.
patent: 4979872 (1990-12-01), Myers et al.
patent: 4987736 (1991-01-01), Ciokajlo et al.

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