# US 11,078,830 B2 · Multi-stage turbocharger

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- Number: US 11,078,830 B2
- Document ID: US11078830B2
- Status: Granted
- Kind: B2
- Application number: 16/674,623
- Filed: 2019-11-05
- Published: 2020-02-27
- Granted: 2021-08-03
- Earliest claimed: 2017-06-13
- Assignees: IHI Corporation
- Applicants: IHI Corporation
- Inventors: Kiyomichi Ichikawa; Yoshimitsu Matsuyama; Munehiro Yoshida
- Web page: https://patentgrep.com/patent/US11078830B2

## CPC

- F02B 37/025: {Multiple scrolls or multiple gas passages guiding the gas to the pump drive}
- F02B 37/00: Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B 37/013: with exhaust-driven pumps arranged in series
- F02B 39/00: Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A multi-stage turbocharger includes a turbine housing including a first sub-housing that has a first turbine-wheel chamber and a second sub-housing that has a second turbine-wheel chamber arranged in series to the first turbine-wheel chamber, a first compressor housing coupled to the turbine housing via a first bearing housing, and a second compressor housing coupled to the turbine housing via a second bearing housing. The first sub-housing and the second sub-housing are formed integrally with each other.

## Claims

### Claim 1

A multi-stage turbocharger comprising:
a turbine housing including a first sub-housing that has a first turbine-wheel chamber and a second sub-housing that has a second turbine-wheel chamber arranged in series to the first turbine-wheel chamber;
a first compressor housing coupled to the turbine housing via a first bearing housing; and
a second compressor housing coupled to the turbine housing via a second bearing housing, wherein
the first sub-housing and the second sub-housing are formed integrally with each other,
the first sub-housing and the second sub-housing are connected to and are separated from each other via a second intake passage,
the turbine housing includes
a first intake passage and a first exhaust passage that communicate with the first turbine-wheel chamber and the second intake passage, and
a second exhaust passage that communicates with the second turbine-wheel chamber,
an intake side of the first intake passage, an intake side of the second intake passage, and a discharge side of the second exhaust passage are open toward a substantially same direction,
the first sub-housing includes a first flange on which the intake side of the first intake passage and the intake side of the second intake passage are open, and
the second sub-housing includes a second flange on which the discharge side of the second exhaust passage.

### Claim 2 (depends on 1)

The multi-stage turbocharger according to claim 1, wherein the second intake passage is inclined with respect to a plane in which a scroll passage of the second turbine-wheel chamber extends.

### Claim 3 (depends on 2)

The multi-stage turbocharger according to claim 2, wherein the first compressor housing and the second compressor housing are formed independently of each other.

### Claim 4 (depends on 1)

The multi-stage turbocharger according to claim 1, wherein the first compressor housing and the second compressor housing are formed independently of each other.

### Claim 5 (depends on 1)

The multi-stage turbocharger according to claim 1, wherein the first exhaust passage communicates with the second intake passage inside the first sub-housing.

### Claim 6 (depends on 1)

The multi-stage turbocharger according to claim 1, wherein a cross-sectional area of the second intake passage gradually decreases from the first flange toward a scroll passage of the second sub-housing.