# US 2021/0277822 A1 · Variable capacity turbocharger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0277822 A1 - Document ID: US20210277822A1 - Status: Published application - Kind: A1 - Application number: 17/330,476 - Filed: 2021-05-26 - Published: 2021-09-09 - Earliest claimed: 2018-12-04 - Assignees: IHI Corporation - Applicants: IHI Corporation - Inventors: Katsunori HAYASHI - Web page: https://patentgrep.com/patent/US20210277822A1 ## CPC - F02B 37/22: by varying cross-section of exhaust passages or air passages {, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits} (F02B37/24 takes precedence) - F01D 17/165: {for radial flow, i.e. the vanes turning around axes which are essentially parallel to the rotor centre line (F01D17/167 takes precedence)} - F01D 25/12: Cooling - F01D 25/162: {Bearing supports} - F02B 37/24: by using pumps or turbines with adjustable guide vanes - F02B 39/00: Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00 - F05D 2220/40: in turbochargers - F05D 2240/15: Heat shield - F05D 2240/50: Bearings - F05D 2240/55: Seals - Y02T 10/12: Improving ICE efficiencies - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A turbocharger includes a variable nozzle unit, a bearing housing, a circular heat shield plate located between a turbine impeller and the bearing housing, and a water chamber formed in the bearing housing. The heat shield plate is fixed by being pressed against the variable nozzle unit by a disc spring and is radially aligned by being fitted into the bearing housing by a fitting portion. The heat shield plate includes a fitting surface formed in the fitting portion and an inner peripheral heat shield portion projecting radially inward from the fitting surface and located with an axial gap between the inner peripheral heat shield portion and the bearing housing. At least a part of the water chamber exists at the same radial position as a radial position of the fitting portion. ## Claims ### Claim 1 A variable capacity turbocharger comprising: a variable nozzle unit rotating a nozzle vane inside a nozzle flow passage of a turbine; a bearing housing accommodating a bearing supporting a rotation shaft of a turbine impeller of the turbine; a circular heat shield plate located between the turbine impeller and the bearing housing and surrounding the rotation shaft in a circumferential direction of the rotation shaft; and a water chamber which is provided in the bearing housing and circulates a cooling water, wherein the heat shield plate is sandwiched between the variable nozzle unit and the bearing housing together with a disc spring in an axial direction of the rotation shaft, is fixed by being pressed against the variable nozzle unit by the disc spring in the axial direction, and is aligned in a radial direction of the rotation shaft by being fitted into the bearing housing by a fitting portion extending in the circumferential direction, wherein the heat shield plate comprises: a fitting surface formed in the fitting portion and fitted into the bearing housing; and an inner peripheral heat shield portion projecting radially inward from the fitting surface and located with a gap between the bearing housing in the axial direction, and wherein at least a part of the water chamber exists at a same radial position as a radial position of the fitting portion. ### Claim 2 (depends on 1) The variable capacity turbocharger according to claim 1, wherein the fitting portion is located inside of an outer peripheral edge of the turbine impeller in the radial direction. ### Claim 3 (depends on 1) The variable capacity turbocharger according to claim 1, wherein the bearing housing comprises: a heat shield plate receiving surface facing the fitting surface of the heat shield plate; and a disc spring installation surface on which the disc spring is provided, and wherein the disc spring installation surface is formed to be flush with the heat shield plate receiving surface. ### Claim 4 A turbocharger comprising: a turbine impeller; a bearing housing; a rotation shaft; a circular heat shield plate which is provided between the turbine impeller and the bearing housing in an axial direction of the rotation shaft, and surrounds the rotation shaft in a circumferential direction of the rotation shaft; a fitting portion at which the heat shield plate is fitted into the bearing housing; and a seal ring which is provided between the bearing housing and the rotation shaft in a radial direction of the rotation shaft, wherein the heat shield plate comprises an inner peripheral heat shield portion which projects radially inward from the fitting portion. ### Claim 5 (depends on 4) The turbocharger according to claim 4, wherein the bearing housing comprises a bearing housing inner peripheral portion which is an inner peripheral portion of the bearing housing, wherein an outer peripheral surface of the seal ring contacts the bearing housing inner peripheral portion, and wherein the inner peripheral heat shield portion substantially covers the bearing housing inner peripheral portion in the axial direction when viewed from a side of the turbine impeller. ### Claim 6 (depends on 5) The turbocharger according to claim 5, wherein the inner peripheral heat shield portion is located with a gap between the bearing housing inner peripheral portion in the axial direction. ### Claim 7 (depends on 4) The turbocharger according to claim 4, wherein the fitting portion is located in a vicinity of a center of a radial width of the heat shield plate and extends in the circumferential direction, and wherein the seal ring is located between the rotation shaft and an innermost peripheral portion of the heat shield plate in the radial direction and extends in the circumferential direction. ### Claim 8 (depends on 4) The turbocharger according to claim 4, wherein the fitting portion is located closer to the rotation shaft than an outer peripheral edge of the turbine impeller in the radial direction. ### Claim 9 (depends on 4) The turbocharger according to claim 4, wherein a fitting state between the heat shield plate and the bearing housing at the fitting portion is a clearance fit. ### Claim 10 (depends on 9) The turbocharger according to claim 9, wherein the bearing housing comprises a heat shield plate receiving surface for fitting the heat shield plate into the bearing housing, wherein the heat shield plate comprises a fitting surface facing the heat shield plate receiving surface, wherein the heat shield plate receiving surface and fitting surface form the fitting portion, and wherein the heat shield plate receiving surface and the fitting surface are in sliding contact with each other. ### Claim 11 (depends on 9) The turbocharger according to claim 9, wherein the bearing housing comprises a heat shield plate receiving surface for fitting the heat shield plate into the bearing housing, wherein the heat shield plate comprises a fitting surface facing the heat shield plate receiving surface, wherein the heat shield plate receiving surface and fitting surface form the fitting portion, and wherein a gap exists between the heat shield plate receiving surface and the fitting surface. ### Claim 12 A turbocharger comprising: a turbine impeller; a bearing housing; a rotation shaft; a circular heat shield plate which is provided between the turbine impeller and the bearing housing in an axial direction of the rotation shaft, and surrounds the rotation shaft in a circumferential direction; a fitting portion at which the heat shield plate is fitted into the bearing housing; and a water chamber which is provided in the bearing housing and circulates a cooling water, wherein at least a part of the water chamber exists at a same radial position as a radial position of the fitting portion. ### Claim 13 (depends on 12) The turbocharger according to claim 12, wherein the part of the water chamber exists at the same radial position as the radial position of the fitting portion in an entire circumferential direction of the rotation shaft. ### Claim 14 (depends on 12) The turbocharger according to claim 12, further comprising a disc spring which is sandwiched between the heat shield plate and the bearing housing in the axial direction, and presses the heat shield plate toward the turbine impeller, wherein at least a part of the water chamber exists at a same radial position as a radial position of the disc spring. ### Claim 15 (depends on 12) The turbocharger according to claim 12, wherein the bearing housing comprises: a heat shield plate receiving surface for fitting the heat shield plate into the bearing housing; and a disc spring installation surface on which a disc spring is provided, and wherein the disc spring installation surface is formed to be flush with the heat shield plate receiving surface. ### Claim 16 (depends on 15) The turbocharger according to claim 15, wherein at least a part of the water chamber exists at a same radial position as a radial position of the disc spring installation surface and the heat shield plate receiving surface.