# US 11,905,966 B2 · Compressor wheel arrangement and method for the production of a compressor wheel arrangement

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- Number: US 11,905,966 B2
- Document ID: US11905966B2
- Status: Granted
- Kind: B2
- Application number: 17/822,575
- Filed: 2022-08-26
- Published: 2023-03-02
- Granted: 2024-02-20
- Earliest claimed: 2021-08-31
- Assignees: BorgWarner Inc.
- Applicants: BorgWarner Inc.
- Inventors: Timo Breininger; Dietmar Metz; Niclas Schenkenberger; Michael Schoeps; Daniel Speller
- Web page: https://patentgrep.com/patent/US11905966B2

## CPC

- B23P 15/006: {turbine wheels}
- F04D 29/266: {mounting compressor rotors on shafts}
- B23K 20/12: the heat being generated by friction; Friction welding
- B23K 20/129: {specially adapted for particular articles or work}
- B23K 20/2275: {the other layer being aluminium}
- B23P 15/04: turbine or like blades from several pieces
- F02B 39/10: electric
- F04D 17/10: for compressing or evacuating
- F04D 25/024: {the driving means being assisted by a power recovery turbine}
- F04D 25/0606: {the electric motor being specially adapted for integration in the pump}
- F04D 29/023: {especially adapted for elastic fluid pumps}
- F04D 29/053: Shafts
- F04D 29/284: {for compressors}
- F04D 29/5853: {heat insulation or conduction}
- F04D 29/624: {especially adapted for elastic fluid pumps}
- B23K 2101/006: {Vehicles}
- B23K 2101/04: Tubular or hollow articles
- B23K 2103/20: Ferrous alloys and aluminium or alloys thereof
- B23P 11/00: Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for (connecting sheet metal or metal tubes, rods or profiles B21D39/00; riveting B21J; soldering, unsoldering, welding B23K; hand tools for connecting wire or strip B25B25/00; connecting metal parts by adhesives F16B11/00)
- F05D 2220/40: in turbochargers
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- 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 compressor wheel arrangement for an electrically powered turbocharger, which can be connected with a rotor shaft of the turbocharger, having a compressor wheel made of a first metallic material, a shaft made of a second metallic material, which is tightly connected with the compressor wheel, at least one permanent magnet, which is non-rotatably arranged on the section of the shaft, in a ring-shaped area around a section of the shaft that extends behind the compressor wheel, between a casing and the shaft.

## Claims

### Claim 1

A compressor wheel arrangement for an electrically powered turbocharger, which can be connected to a rotor shaft of the turbocharger, the compressor wheel arrangement comprising:
a compressor wheel made of a first metallic material and formed of one part, the compressor wheel defining a recess having a step;
a shaft made of a second metallic material, the shaft including:
a first shaft section including an end of the shaft engaged with the recess of the compressor wheel and abutting the step to form a shaft-hub connection to connect the shaft to the compressor wheel, and
a second shaft section that extends behind the compressor wheel between a casing and the first shaft section; and
at least one permanent magnet non-rotatably arranged on the second shaft section in a ring-shaped area around the second shaft section, wherein the at least one permanent magnet is thermally coupled with the compressor wheel.

### Claim 2 (depends on 1)

The compressor wheel arrangement according to claim 1, wherein the shaft is connected to the compressor wheel by a friction-welded connection.

### Claim 3 (depends on 1)

The compressor wheel arrangement according to claim 1, wherein the shaft-hub connection is formed as a press-fit connection or as a shrink-fit connection.

### Claim 4 (depends on 1)

The compressor wheel arrangement according to claim 1, wherein the first shaft section, at the end of the shaft, has a structure with elevations and/or indentations.

### Claim 5 (depends on 1)

The compressor wheel arrangement according to claim 1, wherein the shaft comprises a ferromagnetic material, and/or the compressor wheel comprises aluminium.

### Claim 6 (depends on 1)

The compressor wheel arrangement according to claim 1, wherein the at least one permanent magnet is formed as a magnetic sleeve.

### Claim 7 (depends on 1)

The compressor wheel arrangement according to claim 1, wherein an adhesive layer is arranged between the at least one permanent magnet and the shaft, as well as between the at least one permanent magnet and the compressor wheel.

### Claim 8 (depends on 1)

The compressor wheel arrangement according to claim 1, wherein the casing is formed as a coil or as a sleeve.

### Claim 9 (depends on 1)

The compressor wheel arrangement according to claim 1, wherein the shaft comprises steel and the compressor wheel comprises aluminium.