Structural low-ductility turbine shroud apparatus
First Claim
1. A turbine shroud apparatus for a gas turbine engine having a central axis, comprising:
- an arcuate shroud segment comprising low-ductility material and having a cross-sectional shape defined by opposed forward and aft walls, and opposed inner and outer walls, the walls extending between opposed first and second end faces and collectively defining a shroud cavity;
a turbine vane disposed upstream of the shroud segment and arranged such that there is a continuous mechanical load path from the turbine vane to the forward wall of the shroud segment;
an annular stationary structure surrounding the shroud segment, where the shroud segment is mechanically coupled to the stationary structure, and wherein the stationary structure includes at least one axially-facing bearing surface which is in direct contact with the aft wall of the shroud segment; and
a load spreader received in the shroud cavity of the shroud segment and mechanically coupled to the stationary structure, the load spreader comprising;
a laterally-extending plate with opposed inner and outer faces; and
a boss which protrudes radially from the outer face and extends through a mounting hole in the outer wall of one of the shroud segments; and
a fastener engaging the boss and the stationary structure, so as to clamp the boss against the stationary structure in a radial direction;
wherein the shroud segment is disposed so as to absorb at least one axially-aligned force from the turbine vane and transfer the axially-aligned force to the bearing surface.
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Accused Products
Abstract
A turbine shroud apparatus for a gas turbine engine having a central axis includes: an arcuate shroud segment comprising low-ductility material and having a cross-sectional shape defined by opposed forward and aft walls, and opposed inner and outer walls, the walls extending between opposed first and second end faces and collectively defining a shroud cavity; and an annular stationary structure surrounding the shroud segment, where the shroud segment is mechanically coupled to the stationary structure. The stationary structure includes at least one axially-facing bearing surface which is in direct contact with the shroud segment, and the shroud segment is disposed so as to absorb at least one axially-aligned force and transfer the axially-aligned force to the bearing surface.
53 Citations
18 Claims
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1. A turbine shroud apparatus for a gas turbine engine having a central axis, comprising:
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an arcuate shroud segment comprising low-ductility material and having a cross-sectional shape defined by opposed forward and aft walls, and opposed inner and outer walls, the walls extending between opposed first and second end faces and collectively defining a shroud cavity; a turbine vane disposed upstream of the shroud segment and arranged such that there is a continuous mechanical load path from the turbine vane to the forward wall of the shroud segment; an annular stationary structure surrounding the shroud segment, where the shroud segment is mechanically coupled to the stationary structure, and wherein the stationary structure includes at least one axially-facing bearing surface which is in direct contact with the aft wall of the shroud segment; and a load spreader received in the shroud cavity of the shroud segment and mechanically coupled to the stationary structure, the load spreader comprising; a laterally-extending plate with opposed inner and outer faces; and a boss which protrudes radially from the outer face and extends through a mounting hole in the outer wall of one of the shroud segments; and a fastener engaging the boss and the stationary structure, so as to clamp the boss against the stationary structure in a radial direction; wherein the shroud segment is disposed so as to absorb at least one axially-aligned force from the turbine vane and transfer the axially-aligned force to the bearing surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification