# US 10,865,833 B2 · Bearing structure and turbocharger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,833 B2 - Document ID: US10865833B2 - Status: Granted - Kind: B2 - Application number: 16/381,421 - Filed: 2019-04-11 - Published: 2019-08-01 - Granted: 2020-12-15 - Earliest claimed: 2016-11-21 - Assignees: IHI Corporation - Applicants: IHI Corporation - Inventors: Hideyuki Kojima; Shunsuke Nishii - Web page: https://patentgrep.com/patent/US10865833B2 ## CPC - F16C 33/74: of sliding-contact bearings - F01D 25/16: Arrangement of bearings; Supporting or mounting bearings in casings (bearings per se F16C) - F01D 25/168: {for axial load mainly} - F01D 25/186: {for sliding contact bearing} - F02B 39/00: Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00 - F16C 17/04: for axial load only - F16C 33/106: {Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid} - F16C 33/1085: {Channels or passages to recirculate the liquid in the bearing} - F16C 33/743: {retained in the sealing gap} - F01D 25/18: Lubricating arrangements (of machines or engines in general F01M) - F05D 2220/40: in turbochargers - F16C 2360/24: Turbochargers - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract Provided is a bearing structure including: a shaft; a first opposed surface, which is formed on the shaft or a member mounted to the shaft; a first bearing portion, which is opposed to the first opposed surface from one end side of the shaft; a second opposed surface, which is formed on the shaft or the member mounted to the shaft, and is positioned on the one end side of the shaft with respect to the first opposed surface and the first bearing portion; and a second bearing portion, which is opposed to the second opposed surface from the one end side of the shaft. ## Claims ### Claim 1 A bearing structure, comprising: a shaft including an impeller; a first opposed surface, which is formed on the shaft or a member mounted to the shaft; a first bearing portion, which is opposed to the first opposed surface from an impeller side of the shaft; a second opposed surface, which is formed on the shaft or another member mounted to the shaft, and is positioned on the impeller side of the shaft with respect to the first opposed surface and the first bearing portion; a second bearing portion, which is opposed to the second opposed surface from the impeller side of the shaft; a housing including a bearing hole through which the shaft is inserted; and a seal member arranged between the bearing hole and the impeller, wherein the seal member includes: an insertion through hole into which the shaft is inserted; a bearing wall portion including the second bearing portion formed on an outer side with respect to the insertion through hole in a radial direction of the shaft; and an oil-holding portion that is recessed from the second bearing portion toward the impeller side of the shaft. ### Claim 2 (depends on 1) A bearing structure according to claim 1, wherein a first minimum clearance amount, which is a clearance amount between the first opposed surface and the first bearing portion when the shaft maximally moves toward the impeller side, is different from a second minimum clearance amount, which is a clearance amount between the second opposed surface and the second bearing portion when the shaft maximally moves toward the impeller side. ### Claim 3 (depends on 1) A bearing structure according to claim 1, wherein the oil-holding portion includes an upper oil-holding portion, which is formed above a center of the insertion through hole in the bearing wall portion, is recessed from the second bearing portion toward the impeller side of the shaft, and is opened on an outer periphery of the bearing wall portion. ### Claim 4 (depends on 1) A bearing structure according to claim 1, wherein the oil-holding portion includes a lower oil-holding portion, which is formed below a center of the insertion through hole in the bearing wall portion, is recessed from the second bearing portion toward the impeller side of the shaft, and is opened on an inner peripheral surface of the insertion through hole. ### Claim 5 (depends on 1) A bearing structure according to claim 1, further comprising: a third opposed surface, which is formed on the shaft between the first opposed surface and the second opposed surface; and a bearing member, which is configured to receive the shaft inserted therethrough, includes a third bearing portion formed on one end surface of the bearing member and opposed to the third opposed surface, and includes the first bearing portion formed on another end surface of the bearing member. ### Claim 6 (depends on 5) A bearing structure according to claim 5, further comprising: a mounting hole, which is formed in the housing; a pin hole, which is formed in the bearing member, and is opposed to the mounting hole in a radial direction of the shaft; and a pin, which is fixed to the mounting hole, and includes a distal end side inserted into the pin hole. ### Claim 7 (depends on 6) A bearing structure according to claim 6, wherein the member mounted to the shaft is a rotary member, which is mounted on the impeller side of the shaft with respect to the bearing member, and includes the second opposed surface; and a through hole, which is formed in the rotary member, includes one end opened on the second opposed surface, and includes another end opened on a side away from the impeller of the shaft with respect to the second opposed surface. ### Claim 8 (depends on 5) A bearing structure according to claim 5, wherein the member mounted to the shaft is a rotary member, which is mounted on the impeller side of the shaft with respect to the bearing member, and includes the second opposed surface; and a through hole, which is formed in the rotary member, includes one end opened on the second opposed surface, and includes another end opened on a side away from the impeller of the shaft with respect to the second opposed surface. ### Claim 9 (depends on 1) A turbocharger comprising the bearing structure of claim 1.