# US 11,111,819 B2 · Iron material for high-temperature-resistant bearing bushings, bearing bushing made of said material, and turbocharger having such a bearing bushing

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- Number: US 11,111,819 B2
- Document ID: US11111819B2
- Status: Granted
- Kind: B2
- Application number: 16/327,918
- Filed: 2017-07-31
- Published: 2019-07-18
- Granted: 2021-09-07
- Earliest claimed: 2016-08-24
- Assignees: CPT Group GmbH
- Applicants: Cpt Group GmbH
- Inventors: Martin Thomas; Guenter Muench; Alexander Waas
- Web page: https://patentgrep.com/patent/US11111819B2

## CPC

- F01D 25/166: {Sliding contact bearing (gas bearings F01D25/22)}
- C22C 30/02: containing copper
- C22C 37/04: containing spheroidal graphite
- C22C 37/08: with nickel
- C22C 37/10: containing aluminium or silicon
- F02B 37/18: by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere}
- F16C 17/10: for both radial and axial load
- F16C 33/62: Selection of substances
- F05D 2220/40: in turbochargers
- F05D 2300/111: Cast iron
- F16C 2204/60: Ferrous alloys, e.g. steel alloys
- F16C 2360/24: Turbochargers
- Y02T 10/12: Improving ICE efficiencies
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- 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

Bearing bushings which are exposed to highly elevated temperatures during operation, corresponding high-temperature-resistant bearing bushings and exhaust-gas turbochargers having at least one such bearing bushing, include an iron material having a material composition which, apart from iron, has at least carbon, silicon, manganese, nickel, chromium, molybdenum and tungsten alloy constituents in certain amounts. This material composition ensures sufficient temperature resistance and self-lubricating properties with simultaneously good machining properties and a moderate price.

## Claims

### Claim 1

An iron material, comprising:
a material composition including iron, Fe and at least alloy constituents within limit amounts stated below in percent by weight, wt. %:
carbon, C: 1.5 to 3.0 wt. %;
silicon, Si: 1.0 to 6.0 wt. %;
manganese, Mn: 1.5 to 7.00 wt. %;
nickel, Ni: 12.0 to 36.0 wt. %;
chromium, Cr: 6.0 to 12.00 wt. %;
phosphorus, P: 0.05 to 0.25 wt. %;
copper, Cu: 0.5 to 7.5 wt. %;
molybdenum, Mo: 2.0 to 5.0 wt. %; and
tungsten, W: 0.8 to 2.0 wt. %,
wherein the carbon constituent comprises free carbon incorporated into a structure of the iron material composition as lamellar graphite, nodular graphite, or vermicular graphite to improve self-lubrication properties of the iron material.

### Claim 2 (depends on 1)

The iron material according to claim 1, wherein said material composition forms a high-temperature-resistant bearing bushing.

### Claim 3 (depends on 1)

A bearing bushing for use under high-temperature conditions, the bearing bushing comprising or being manufactured from the iron material according to claim 1.

### Claim 4 (depends on 1)

An exhaust-gas turbocharger, comprising:
an exhaust-gas turbine;
a fresh-air compressor;
a bearing unit;
at least one movable actuating apparatus for influencing fluid mass flows flowing through at least one of said exhaust-gas turbine or said fresh-air compressor; and
at least one bearing bushing for use under high-temperature conditions, said at least one bearing bushing movably mounting said actuating apparatus, and said at least one bearing bushing including or being manufactured from the iron material according to claim 1.

### Claim 5 (depends on 4)

The exhaust-gas turbocharger according to claim 4, wherein said at least one actuating apparatus is a wastegate valve, an overrun air recirculation valve or an adjustable turbine geometry.