# US 8,465,261 B2 · Turbocharger

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

- Number: US 8,465,261 B2
- Document ID: US8465261B2
- Status: Granted
- Kind: B2
- Application number: 12/517,389
- Filed: 2007-10-23
- Published: 2010-01-07
- Granted: 2013-06-18
- Earliest claimed: 2006-12-11
- Assignees: BorgWarner Inc.
- Applicants: Christian Holzschuh
- Inventors: Christian Holzschuh
- Web page: https://patentgrep.com/patent/US8465261B2

## CPC

- F04D 29/266: {mounting compressor rotors on shafts}
- F01D 5/025: {Fixing blade carrying members on shafts (attachment of a member on a shaft in general F16D1/06; for non-positive displacement pumps F04D29/00)}
- F01D 25/186: {for sliding contact bearing}
- F02B 37/00: Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F05D 2220/40: in turbochargers
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- 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

The invention refers to a turbocharger with a compressor (8) which has a compressor wheel (9) which is fixed on one end of a rotor shaft (6); with a turbine (2) which has a turbine rotor (10) which comprises a turbine wheel (5) which has a connecting journal (17) which can be connected to a connecting section (12) of the rotor shaft (6), and with at least one piston ring groove (11, 11′) which is provided on the turbine rotor (10); wherein the piston ring groove (11, 11′) is arranged on the connecting journal (17).

## Claims

### Claim 1

A turbocharger (1) comprising:
a compressor (8), which has a compressor wheel (9) which is fixed on one end of a rotor shaft (6);
a turbine (2), which has a turbine rotor (10), which comprises a turbine wheel (5) which has a connecting journal (17) which is connected to a connecting section (12) of the rotor shaft (6); and
at least two piston ring grooves (11, 11′), arranged on the connecting journal (17) of the turbine rotor (10),
wherein the connecting journal (17) of the turbine wheel (5) has a cylindrical cavity (15), the depth (L) of which is smaller than a length (B) of the connecting journal (17), measured from an axial shaft-side end face (14) of the rotor shaft (6) to a wheel back (13) of the turbine wheel (5), and wherein the piston ring grooves (11, 11′) surround the cavity (15).

### Claim 2 (depends on 1)

The turbocharger as claimed in claim 1, wherein a connecting plane (A) is arranged between the rotor shaft (6) and the turbine wheel (5) at a axial distance to the nearest piston groove (11, 11′).

### Claim 3 (depends on 1)

The turbocharger as claimed in claim 1, wherein the turbine wheel (5) and the rotor shaft (6) are connected by means of a friction weld or by means of an electron beam weld.

### Claim 4

A turbine rotor (10) of a turbocharger (1) comprising:
a turbine wheel (5), which has a connecting journal (17) which is configured for connection to a connecting section (12) of a rotor shaft (6), the connecting journal (17) having a cavity (15) for receiving a portion of the rotor shaft (6), the connecting journal (17) extending from the turbine wheel (5) to an end,
wherein at least one piston ring groove (11, 11′) is arranged on the connecting journal (17) proximate to the end thereof, the at least one piston ring groove (11, 11′) surrounding the cavity (15).

### Claim 5

A turbine rotor (10) of a turbocharger (1) comprising:
a turbine wheel (5) which has a connecting journal (17) connected to a connecting section (12) of a rotor shaft (6), and
at least two piston ring grooves (11, 11′) arranged on the connecting journal (17) of the turbine rotor (10),
wherein the connecting journal (17) of the turbine wheel (5) has a cylindrical cavity (15), the depth (L) of which is smaller than a length (B) of the connecting journal (17), measured from an axial shaft-side end face (14) of the rotor shaft (6) to a wheel back (13) of the turbine wheel (5), and wherein the piston ring grooves (11, 11′) surround the cavity (15).