ISO 20054:2016

INTERNATIONAL ISO
STANDARD 20054
First edition
2016-09-01
Plain bearings — Bearings containing
dispersed solid lubricants
Paliers lisses — Paliers contenant des lubrifiants solides dispersés
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units . 1
5 Characteristics . 1
5.1 Structure . 1
5.2 Bearing characteristics . 2
5.3 Applicable field . 3
6 Material . 3
6.1 Metal matrix . 3
6.2 Solid lubricant. 4
6.3 Combination of metal matrix and solid lubricant . 4
7 Dimension . 5
7.1 General . 5
7.2 General dimension . 5
7.2.1 Seamless bush . 5
7.2.2 Wrapped bush . 7
7.3 Tolerance classes and limit deviations . 7
7.3.1 General. 7
7.3.2 Housing fit . 7
7.3.3 Shaft clearance . 7
8 Assembling . 8
9 Surface finish . 8
Annex A (informative) Guide for selection of a bearing metal matrix for bearings
containing dispersed solid lubricants. 9
Annex B (informative) Actual applications of a bearing containing dispersed solid lubricants .10
Bibliography .11
Foreword
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The committee responsible for this document is ISO/TC 123, Plain bearings, Subcommittee SC 7, Special
types of plain bearings.
iv © ISO 2016 – All rights reserved

INTERNATIONAL STANDARD ISO 20054:2016(E)
Plain bearings — Bearings containing dispersed solid
lubricants
1 Scope
This document specifies a bearing containing dispersed solid lubricants which is used as a solid
lubricant bearing.
NOTE In the solid lubricant bearing among self-lubricating bearings there is a solid type, a coated type, an
embedded type and a dispersed type, which is specified by this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3547-1, Plain bearings — Wrapped bushes — Part 1: Dimensions
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:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
4 Symbols and units
See Table 1.
Table 1 — Symbols and units
Symbol Description Unit
B Width of the bush mm
D Inside diameter of the bush mm
i
D Outside diameter of the bush mm
o
5 Characteristics
5.1 Structure
A bearing containing dispersed solid lubricants is made of sintered composite materials that contain
solid lubricants dispersed uniformly in the metal matrix and is manufactured by powder metallurgy
(see Figure 1).
This document includes multi-layered bearings with the sintered layer on a steel backing and both
seamless and wrapped bushes (see Figure 2).
Figure 3 shows a typical microstructure of the bearings containing dispersed solid lubricants. The
dispersed solid lubricants in the metal matrix vary in grain size and volume.
a)  Seamless bush b)  Seamless bush
(fine solid lubricants type) (coarse solid lubricants type)
Figure 1 — Overview of bearings containing dispersed solid lubricants (single-layered)
a)  Seamless bush b)  Wrapped bush
Key
1 sintered layer
2 steel backing
Figure 2 — Overview of bearings containing dispersed solid lubricants (multi-layered)
a)  Fine solid lubricants type b)  Coarse solid lubricants type
Key
1 metal matrix
2 dispersed solid lubricant
Figure 3 — Microstructure of a bearing containing dispersed solid lubricants
5.2 Bearing characteristics
A bearing containing dispersed solid lubricants obtains its sliding performance from the self-lubricating
effects of solid lubricants and the mechanical strength of metal matrix.
2 © ISO 2016 – All rights reserved

The sliding performance and mechanical strength vary according to the volume of solid lubricants.
Higher sliding performance requires more solid lubricants, while higher mechanical strength requires
less solid lubricants.
Since solid lubricants are dispersed over the entire material, the bearings are particularly suitable for
extra low speed or micro-motion applications, minimising static friction to achieve smooth sliding at
the start of motion.
The solid lubricants are drawn out over both surfaces from the bearing material when it slides
against the mating surface, forming a solid lubricant film. As the solid lubricant film is consumed, it is
replenished from the bearing material to maintain a continuous film throughout the life of the product
(see Figure 4).
Key
1 mating member
2 metal matrix
3 dispersed solid lubricant
4 solid lubricant film
A sliding direction
Figure 4 — Lubricating mechanism of a bearing containing dispersed solid lubricants
5.3 Applicable field
The bearing can be used for rotational motion, reciprocating motion, oscillating m
...