# US 12,215,705 B2 · Turbocharger including an annular bearing retainer plate

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,215,705 B2
- Document ID: US12215705B2
- Status: Granted
- Kind: B2
- Application number: 18/365,277
- Filed: 2023-08-04
- Published: 2023-11-23
- Granted: 2025-02-04
- Earliest claimed: 2021-04-23
- Assignees: IHI Corporation
- Applicants: IHI Corporation
- Inventors: Takahiro Tanaka; Akihiro Ueda; Hideyuki Kojima
- Web page: https://patentgrep.com/patent/US12215705B2

## CPC

- F04D 29/059: Roller bearings
- F16C 19/547: {with two angular contact rolling bearings}
- F01D 25/16: Arrangement of bearings; Supporting or mounting bearings in casings (bearings per se F16C)
- F01D 25/183: {Sealing means}
- F02B 37/00: Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B 39/14: Lubrication of pumps; Safety measures therefor
- F04D 17/10: for compressing or evacuating
- F04D 25/024: {the driving means being assisted by a power recovery turbine}
- F04D 29/051: Axial thrust balancing
- F04D 29/063: specially adapted for elastic fluid pumps
- F04D 29/4206: {especially adapted for elastic fluid pumps}
- F16C 19/184: {in O-arrangement}
- F16C 33/6659: {Details of supply of the liquid to the bearing, e.g. passages or nozzles}
- F05D 2220/40: in turbochargers
- F05D 2260/79: Bearing, support or actuation arrangements therefor
- F16C 2360/24: Turbochargers
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- 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

A turbocharger includes: a shaft; a rolling bearing including an inner ring mounted on the shaft and an outer ring arranged around the inner ring; a housing including a bearing hole accommodating the rolling bearing; a compressor impeller provided on the shaft at an outside the bearing hole; and an annular bearing retainer plate arranged between the bearing hole and the compressor impeller in the central axis direction of the shaft and including an end face facing a side face of the outer ring, the end face including an annular circumferential oil groove continuously extending along the entire circumferential direction of the shaft and a protrusion located inside the circumferential oil groove in a radial direction of the shaft and protruding in a central axis direction of the shaft.

## Claims

### Claim 1

A turbocharger comprising:
a shaft;
a rolling bearing including an inner ring mounted on the shaft and an outer ring arranged around the inner ring;
a housing including a bearing hole accommodating the rolling bearing;
a compressor impeller provided on the shaft at an outside the bearing hole; and
an annular bearing retainer plate arranged between the bearing hole and the compressor impeller in a central axis direction of the shaft and including an end face facing a side face of the outer ring, the end face including an annular circumferential oil groove continuously extending along the entire circumferential direction of the shaft and a protrusion located inside the circumferential oil groove in a radial direction of the shaft and protruding in the central axis direction of the shaft,
wherein the end face of the bearing retainer plate includes a guide oil groove extending inward from an area that is radially outside the side face of the outer ring when seen from the central axis direction of the shaft and connected to the circumferential oil groove, and
the circumferential oil groove is deeper than the guide oil groove.

### Claim 2 (depends on 1)

The turbocharger according to claim 1,
wherein the protrusion is only provided within a range of between −90 degrees and 90 degrees in a rotational direction of the shaft with respect to a vertical axis extending upward from a central axis of the shaft.

### Claim 3 (depends on 1)

The turbocharger according to claim 1,
wherein an entirety of the guide oil groove is located within a range of greater than 0 degrees and less than 90 degrees in a rotational direction of the shaft with respect to a vertical axis extending upward from a central axis of the shaft.