ISO 22507:2018

INTERNATIONAL ISO
STANDARD 22507
First edition
2018-09
Plain bearings — Fluid film bearing
materials for vehicular turbocharger
Reference number
ISO 22507:2018(E)
©
ISO 2018

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ISO 22507:2018(E)

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ISO 22507:2018(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements for bearing material . 1
4.1 General . 1
4.2 Seizure resistance . 1
4.3 Wear resistance . 1
4.4 Chemical corrosion resistance . 2
5 Bearing material . 2
Annex A (informative) Vehicular turbocharger and bearings . 4
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ISO 22507:2018(E)

Foreword
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This document was prepared by Technical Committee ISO/TC 123, Plain bearings, Subcommittee SC 7,
Special types of plain bearings.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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INTERNATIONAL STANDARD ISO 22507:2018(E)
Plain bearings — Fluid film bearing materials for vehicular
turbocharger
1 Scope
This document specifies the material compositions and required properties of fluid film bearings used
for vehicular turbochargers.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
4 Requirements for bearing material
4.1 General
Distinctive conditions of turbochargers are:
— sliding speed is high,
— bearings are exposed to high temperature oil, and
— oil contains contaminants such as soot from the engine.
Therefore, fluid film bearing materials for vehicular turbochargers shall have special properties of
seizure resistance, wear resistance and chemical corrosion resistance as described in the following
subclauses.
Materials of mating runner parts such as shaft and thrust collar shall be hard and smooth enough to
use the maximum capability of the bearing materials.
See Annex A for a general description of a vehicular turbocharger and bearings.
4.2 Seizure resistance
There are cases when the sliding speed of bearings exceeds 100 m/s. For such high speed condition,
seizure resistance against a possible metal contact is required for bearing materials.
4.3 Wear resistance
If a bearing comes to contact with the rotating shaft, or if soot is mixed into the lubricating oil, bearing
wear can occur. In recent years, oil viscosity grade has also been decreasing from an environmental
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ISO 22507:2018(E)

point of view. Excessively worn bearings bring vibration and decrease in machine efficiency. For such
condition, wear resistance to assure normal machine operation is required for bearing materials.
4.4 Chemical corrosion resistance
Bearing inlet oil temperature exceeds 100 °C, and the bearings are exposed to the oil at more than
200 °C just after the stop of the engine d
...