# US 10,370,997 B2 · Turbine shroud having ceramic matrix composite seal segment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,370,997 B2 - Document ID: US10370997B2 - Status: Granted - Kind: B2 - Application number: 14/721,651 - Filed: 2015-05-26 - Published: 2017-02-16 - Granted: 2019-08-06 - Earliest claimed: 2015-05-26 - Assignees: ROLLS-ROYCE plc; Rolls-Royce North American Technologies Inc.; Rolls-Royce High Temperature Composites Inc. - Applicants: Rolls-Royce Corporation; Rolls-Royce North American Technologies Inc.; Rolls-Royce High Temperature Composites Inc. - Inventors: Daniel Kent Vetters; David J. Thomas; Douglas David Dierksmeier; Jun Shi; Todd Engel - Web page: https://patentgrep.com/patent/US10370997B2 ## CPC - F01D 11/12: using a rubstrip, e.g. erodible. deformable or resiliently-biased part - F01D 9/02: Nozzles; Nozzle boxes; Stator blades; Guide conduits {, e.g. individual nozzles (nozzle boxes F01D9/047)} - F01D 25/246: {Fastening of diaphragms or stator-rings} - F05D 2220/32: in gas turbines - F05D 2240/11: Shroud seal segments - F05D 2250/15: spiral - F05D 2260/30: Retaining components in desired mutual position - F05D 2260/38: by a spring, i.e. spring loaded or biased towards a certain position - F05D 2260/941: particularly aimed at mechanical or thermal stress reduction - F05D 2300/6033: Ceramic matrix composites [CMC] - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A segmented turbine shroud for radially encasing a rotatable turbine in a gas turbine engine comprising a carrier, a ceramic matrix composite (CMC) seal segment, and an elongated pin. The carrier defines a pin-receiving carrier bore and the CMC seal segment defines a pin-receiving seal segment bore. The elongated pin extends through the carrier bore and the seal segment bore. The pin-receiving carrier bore includes a cantilevered member such that the carrier bore has a length sufficient to effect radial flexion between the carrier bore and the pin received within the carrier bore during operation of the turbine. ## Claims ### Claim 1 A segmented turbine shroud for radially encasing a rotatable turbine in a gas turbine engine, the shroud comprising: a carrier comprising a forward generally planar flange and an aft generally planar flange, each of said flanges extending radially inward toward the turbine perpendicular to the axis of rotation of the turbine, said forward flange comprising a forward portion defining a pin-receiving forward carrier bore extending through the forward portion and said aft flange comprising an aft portion defining a pin-receiving aft carrier bore extending through said aft portion, wherein both the forward carrier bore and aft carrier bore have an axis parallel to the axis of rotation of the turbine; a ceramic matrix composite (CMC) seal segment comprising a portion defining a pin-receiving seal segment bore; and an elongated pin extending through said forward carrier bore, said seal segment bore, and said aft carrier bore, wherein each of said carrier flange portions defining said pin-receiving forward carrier bore and said pin-receiving aft carrier bore include a respective member extending axially from said flange to thereby define the carrier bore having a length greater than the axial dimension of said flange, said member having a length sufficient to effect radial flexion between said member and said pin received within said carrier bore during operation of the gas turbine engine. ### Claim 2 (depends on 1) The shroud of claim 1 wherein the length of said carrier bore is at least 120% of the axial dimension of said flange. ### Claim 3 (depends on 1) The shroud of claim 1 wherein said carrier portion defines a carrier bore comprising a continuously curved lateral cross-section. ### Claim 4 (depends on 3) The shroud of claim 3 wherein said carrier portion defines a carrier bore having a circular lateral cross-section. ### Claim 5 (depends on 1) The shroud of claim 1 wherein said carrier bore is adapted to receive an elongated pin comprising a lateral cross-sectional dimension of at least three eighths inches. ### Claim 6 (depends on 1) The shroud of claim 1 wherein said elongated pin is hollow. ### Claim 7 (depends on 1) The shroud of claim 1 further comprising a bushing disposed around said elongated pin within said carrier bore. ### Claim 8 (depends on 1) The shroud of claim 1 wherein said carrier bore comprises a chamfered end. ### Claim 9 (depends on 1) The shroud of claim 1 wherein said carrier bore comprises a minimum lateral cross-sectional dimension of at least three eighths inches. ### Claim 10 A segmented turbine shroud for radially encasing a rotatable turbine in a gas turbine engine, the shroud comprising a plurality of cartridges, one or more cartridges comprising: a carrier segment comprising a plurality of opposing portion pairs, each portion defining a pin-receiving carrier bore having a circular lateral cross-section extending through the respective portion, each opposing portion pair being aligned to receive a single elongated pin within the opposing pin-receiving carrier bores defined thereby; a ceramic matrix composite (CMC) seal segment comprising a plurality of portions each defining a pin-receiving seal segment bore; and a plurality of elongated pins, each pin extending through each of said pair of opposing pin receiving carrier bores and one or more of said seal segment bores, wherein said carrier segment carries a single CMC seal segment by one or more of said elongated pins; wherein each of said carrier portions defining said pin-receiving carrier bores comprise a generally planar flange extending radially inward toward the turbine perpendicular to the axis of rotation of the turbine and a member extending axially from said flange to thereby define the carrier bore having a length greater than the axial dimension of said flange. ### Claim 11 (depends on 10) The cartridge of claim 10 wherein each of said carrier bores is adapted to receive an elongated pin comprising a lateral cross-sectional dimension of at least three eighths inches. ### Claim 12 (depends on 10) The cartridge of claim 10 wherein the length of each of said carrier bores is at least 120% of the axial dimension of said flange. ### Claim 13 (depends on 10) The shroud of claim 10 further comprising a radially compressible bushing disposed around said elongated pin within each of said carrier bores. ### Claim 14 (depends on 10) The cartridge of claim 10 wherein each of said carrier bores comprise opposing ends which are chamfered. ### Claim 15 (depends on 10) The cartridge of claim 10 wherein said carrier segment comprises at least three opposing portion pairs, each portion defining a pin-receiving carrier bore having a circular lateral cross-section, each opposing portion pair being aligned to receive a single elongated pin within the opposing pin-receiving carrier bores defined thereby.