AXIAL BOLTING ARRANGEMENT FOR MID TURBINE FRAME
First Claim
1. A gas turbine engine mid turbine frame comprising an annular outer case and an annular inner case, the inner and outer cases positioned around an engine axis, a plurality of circumferentially spaced load transfer spokes extending radially between the inner and outer cases, the inner case supporting at least one main shaft bearing assembly of the engine, the inner case co-axially mounted to the outer case by the spokes;
- and the spokes having an inner end having a width which is circumferentially enlarged relative to a width of a remainder of the spoke, the inner end having a radially and circumferentially extending face configured to mate a corresponding face on the inner case, a plurality of threaded fasteners extending axially through said mating faces to mount the respective spoke to the inner case.
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Accused Products
Abstract
A mid turbine frame of a gas turbine engine has a plurality of circumferentially spaced load transfer spokes extending radially between outer and inner cases. The load transfer spokes have a circumferentially enlarged inner end which is mounted to the inner case by a plurality of axially disposed fasteners extending through the inner case and spokes.
20 Citations
20 Claims
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1. A gas turbine engine mid turbine frame comprising an annular outer case and an annular inner case, the inner and outer cases positioned around an engine axis, a plurality of circumferentially spaced load transfer spokes extending radially between the inner and outer cases, the inner case supporting at least one main shaft bearing assembly of the engine, the inner case co-axially mounted to the outer case by the spokes;
- and the spokes having an inner end having a width which is circumferentially enlarged relative to a width of a remainder of the spoke, the inner end having a radially and circumferentially extending face configured to mate a corresponding face on the inner case, a plurality of threaded fasteners extending axially through said mating faces to mount the respective spoke to the inner case.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A gas turbine engine having a mid turbine frame assembly, the mid turbine frame assembly comprising:
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an annular outer case configured to be connected to and provide a portion of an engine casing; an annular inner case co-axially disposed within the outer case, the inner case supporting at least one bearing of an engine main shaft; at least three circumferentially spaced load transfer spokes extending radially between the inner and outer cases, each of the spokes being connected to the outer case by at least one bolt; and wherein an inner end of each of the spokes is integrated with a curved plate, the curved plate extending circumferentially to mate with a circumferential section of an annular and radial flange of the inner case, and a plurality of axially disposed bolts fastening the curved plate to the annular and radial flange. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A gas turbine engine having a mid turbine frame assembly, the mid turbine frame assembly comprising:
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an annular outer case configured to be connected to and provide a portion of an engine casing; an annular inner case co-axially disposed within the outer case, the inner case supporting at least one bearing of an engine main shaft; at least three circumferentially spaced load transfer spokes extending radially between the inner and outer cases, each of the spokes being connected to the outer case by at least one bolt; an inter-turbine vane assembly disposed co-axially and radially between the inner and outer cases, the assembly including an annular duct to direct a combustion gas flow to pass therethrough, the duct being defined between annular outer and inner duct walls radially spaced apart and interconnected by at least three radial hollow vanes, the vanes cooperating with openings in the walls to provide radial passageways through the annular duct for receiving the respective spokes to radially extend through the duct; and wherein an inner end of each of the spokes is integrated with a curved plate, the curved plate extending from the inner end oppositely in a circumferential direction to mate with a circumferential section of an annular and radial flange of the inner case, a plurality of axially disposed bolts fastening the curved plate to the annular and radial flange. - View Dependent Claims (19, 20)
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Specification