Method for determining bearing play of exhaust-gas-turbocharger friction bearings

Patent metadata

Field	Value
Publication number	US-10119419-B2
Application number	US-201013499946-A
Country	US
Kind code	B2
Filing date	Oct 1, 2010
Priority date	Oct 16, 2009
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

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.

First claim

The invention claimed is:

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.

2. 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.

3. 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.

4. 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.

Assignees

• Walter Norbert
• Seiler Andre
• Borgwarner Inc

Inventors

• Walter Norbert
• Seiler Andre

Classifications

• F01D25/166 Primary

  Sliding contact bearing (gas bearings F01D25/22) · CPC title

• F16C2360/24

  Turbochargers · CPC title

• F02C6/12

  Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F05D2260/80

  Diagnostics · CPC title