# US 10,119,419 B2 · Method for determining bearing play of exhaust-gas-turbocharger friction bearings

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- Number: US 10,119,419 B2
- Document ID: US10119419B2
- Status: Granted
- Kind: B2
- Application number: 13/499,946
- Filed: 2010-10-01
- Published: 2012-08-02
- Granted: 2018-11-06
- Earliest claimed: 2009-10-16
- Assignees: BorgWarner Inc.
- Applicants: Norbert Walter; Andre Seiler
- Inventors: Norbert Walter; Andre Seiler
- Web page: https://patentgrep.com/patent/US10119419B2

## CPC

- F01D 25/166: {Sliding contact bearing (gas bearings F01D25/22)}
- F02C 6/12: Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
- F16C 17/246: {related to wear, e.g. sensors for measuring wear}
- G01M 13/045: Acoustic or vibration analysis
- F05D 2220/40: in turbochargers
- F05D 2260/80: Diagnostics
- F16C 2360/24: Turbochargers
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

The invention relates to a method for determining bearing play of exhaust-gas-turbocharger friction bearings comprising the following method steps: accelerating the exhaust-gas turbocharger or the body group from standstill to a maximum rotational speed and at the same time registering the vibration acceleration by means of a sensor; determining the constant-tone frequency of the friction bearing at at least one rotational speed; plotting the determined constant-tone frequency in a diagram, in which bearing-play ranges determined experimentally in advance are assigned to constant-tone frequency ranges; and establishing whether or not the determined constant-tone frequency lies in a bearing-play target range.

## Claims

### Claim 1

A method for evaluating exhaust-gas-turbocharger friction bearings, comprising the following method steps:
accelerating a rotating body group of a turbocharger, the rotating body group comprising turbine wheel, compressor wheel, and shaft, said shaft supported by friction bearings, from standstill to a maximum rotational speed on a test bench and at the same time registering the vibration acceleration by means of a sensor;
using the registered vibration acceleration to determine a constant-tone frequency associated with the friction bearings at at least one rotational speed of the turbocharger;
looking up the determined constant-tone frequency on a diagram prepared by experimentally measuring constant-tone frequency and bearing-play of a number of friction bearings and showing a correlation between constant-tone frequency and bearing-play; and
if the determined constant-tone frequency corresponds to a bearing play associated with an acoustically conspicuous noise when in vehicle, rejecting the exhaust-gas-turbocharger friction bearings.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein a frequency spectrum is determined for determining the constant-tone frequency at a rotational speed of the exhaust-gas turbocharger determined experimentally in advance.

### Claim 3 (depends on 2)

The method as claimed in claim 2, wherein the constant-tone frequency is determined during the production of the exhaust-gas turbocharger on an operational balancing bench.

### Claim 4 (depends on 3)

The method as claimed in claim 3, wherein the oil temperature, the oil pressure, and/or the oil viscosity are taken into account as bearing-oil parameters.