# US 11,028,780 B2 · Hydraulic unit gear shrouds > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,780 B2 - Document ID: US11028780B2 - Status: Granted - Kind: B2 - Application number: 16/355,198 - Filed: 2019-03-15 - Published: 2020-09-17 - Granted: 2021-06-08 - Earliest claimed: 2019-03-15 - Assignees: Hamilton Sundstrand Corporation - Applicants: Hamilton Sundstrand Corporation - Inventors: Glenn C. Lemmers, Jr.; Derek R. Hochstetler - Web page: https://patentgrep.com/patent/US11028780B2 ## CPC - F02C 7/32: Arrangement, mounting, or driving, of auxiliaries - F16H 57/0423: {Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes} - F02C 7/36: Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user ({F02C3/107 - F02C3/13 and} F02C7/32 take precedence; couplings for transmitting rotation F16D; gearing in general F16H) - F16H 57/0409: {characterised by increasing efficiency, e.g. by reducing splash losses} - F16H 57/0424: {Lubricant guiding means in the wall of or integrated with the casing, e.g. grooves, channels, holes} - F05D 2260/40311: of the epicyclical, planetary or differential type - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F16H: GEARING - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A gear shroud arrangement includes a plate defining an aperture therethrough. A riser tube has a first end and an opposed second end. The first end of the riser tube is connected to the plate and is aligned with the aperture. A mounting flange extends from the second end of the riser tube. A shroud member extends from the plate in a direction opposite the riser tube. ## Claims ### Claim 1 A gear shroud arrangement comprising: a plate defining an aperture therethrough; a riser tube having a first end and an opposed second end, wherein the first end of the riser tube is connected to the plate and is aligned with the aperture; a mounting flange extends from the second end of the riser tube; and a shroud member extending from the plate in a direction opposite the riser tube, wherein the shroud member includes: a first shroud segment circumferentially crossing a 12 o'clock position on the plate as viewed looking toward the mounting flange; a second shroud segment circumferentially between the 12 o'clock position and a 3 o'clock position relative to the 12 o'clock position; and a third shroud segment circumferentially between the 3 o'clock position and a 6 o'clock position relative to the 12 o'clock position, wherein the second and third shroud segments are convex relative to the riser tube, and wherein a concave web connects between the second and third shroud segments, wherein concave is relative to an axis parallel to the center axis of the riser tube and convex is relative to the axis parallel to the center axis of the riser tube. ### Claim 2 (depends on 1) The arrangement as recited in claim 1, wherein the concave web defines a notch therein. ### Claim 3 (depends on 1) The arrangement as recited in claim 1, wherein the riser tube defines an aperture therethrough extending in a circumferential portion of the riser tube from a position between: an 11 o'clock position and the 12 o'clock position; and a position between a 2 o'clock position and the 3 o'clock position relative to the 12 o'clock position. ### Claim 4 (depends on 1) The arrangement as recited in claim 1, wherein the plate defines a concavity between the 12 o'clock position and the 3 o'clock position for accommodating a differential gear meshing with hydraulics transmission gear shrouded by the shroud member. ### Claim 5 (depends on 1) The arrangement as recited in claim 1, wherein the plate defines a registration feature for registering the plate with an integrated drive generator (IDG) housing, wherein the registration feature includes a radiused section extending from the 6 o'clock position to a 9 o'clock position relative to the 12 o'clock position. ### Claim 6 (depends on 5) The arrangement as recited in claim 5, wherein the registration feature includes a first flat land extending tangent to the radiused section from the 9 o'clock position, terminating in an end that is perpendicular to the first flat land. ### Claim 7 A gear shroud arrangement comprising: a plate defining an aperture therethrough; a riser tube having a first end and an opposed second end, wherein the first end of the riser tube is connected to the plate and is aligned with the aperture; a mounting flange extends from the second end of the riser tube; and a shroud member extending from the plate in a direction opposite the riser tube; wherein the shroud member includes: a first shroud segment circumferentially crossing a 12 o'clock position on the plate as viewed looking toward the mounting flange; a second shroud segment circumferentially between the 12 o'clock position and a 3 o'clock position relative to the 12 o'clock position; and a third shroud segment circumferentially between the 3 o'clock position and a 6 o'clock position relative to the 12 o'clock position; wherein the plate defines a registration feature for registering the plate with an integrated drive generator (IDG) housing, wherein the registration feature includes a radiused section extending from the 6 o'clock position to a 9 o'clock position relative to the 12 o'clock position; wherein the registration feature includes a first flat land extending tangent to the radiused section from the 9 o'clock position, terminating in an end that is perpendicular to the first flat land; wherein the registration feature includes a second flat land extending tangent to the radiused section from the 6 o'clock position, terminating at an end that is perpendicular to the second flat land. ### Claim 8 (depends on 7) The arrangement as recited in claim 7, further comprising an integrated drive generator (IDG) housing, wherein the registration feature is engaged to an outer housing wall of the IDG housing. ### Claim 9 (depends on 8) The arrangement as recited in claim 8, wherein the mounting flange defines a plurality of fastener apertures therethrough, and further comprising a hydraulic transmission unit mounted to the mounting flange by fasteners engaged in the fastener apertures. ### Claim 10 (depends on 9) The arrangement as recited in claim 9, wherein the hydraulic transmission unit is a first hydraulic transmission unit and further comprising an opposed gear shroud for a second hydraulic transmission unit extending parallel to the first hydraulic transmission unit, wherein the opposed gear shroud engages a concave web in the plate. ### Claim 11 (depends on 10) The arrangement as recited in claim 10, wherein the riser tube defines an aperture therethrough extending in a circumferential portion of the riser tube from a position between: an 11 o'clock position and the 12 o'clock position; and a position between a 2 o'clock position and the 3 o'clock position relative to the 12 o'clock position, and wherein a differential shroud extends within the aperture. ### Claim 12 (depends on 7) The arrangement as recited in claim 7, wherein the concave web defines a notch therein. ### Claim 13 (depends on 7) The arrangement as recited in claim 7, wherein the riser tube defines an aperture therethrough extending in a circumferential portion of the riser tube from a position between: an 11 o'clock position and the 12 o'clock position; and a position between a 2 o'clock position and the 3 o'clock position relative to the 12 o'clock position. ### Claim 14 (depends on 7) The arrangement as recited in claim 7, wherein the plate defines a concavity between the 12 o'clock position and the 3 o'clock position for accommodating a differential gear meshing with hydraulics transmission gear shrouded by the shroud member.