ISO 12168-2:2019

Deleted: /FDIS
ISO/TC 123/SC 8
Secretariat: JISC
Plain bearings — Hydrostatic plain journal bearings without drainage grooves under steady-
state conditions — Part 2: Characteristic values for the calculation of oil-lubricated plain journal
bearings without drainage grooves
Paliers lisses — Paliers lisses radiaux hydrostatiques sans rainure d'écoulement fonctionnant en régime
stationnaire — Partie 2: Caractéristiques du calcul pour la lubrification des paliers lisses radiaux sans
rainure d'écoulement
© ISO 2019 – All rights reserved i

© ISO 2018
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Published in Switzerland
ii © ISO 2019 – All rights reserved

Contents
Foreword . 4
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4  Characteristic values . 1
Bibliography . 14
© ISO 2019 – All rights reserved iii

Foreword
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matters of electrotechnical standardization.
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see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 123, Plain bearings, Subcommittee SC 8,
Calculation methods for plain bearings and their applications.
This second edition cancels and replaces the first edition (ISO 12168‐2:2001), of which it constitutes a
minor revision. The changes compared to the previous edition are as follows:
— adjustment to ISO/IEC Directives, Part 2:2018;
— correction of typographical errors.
A list of all parts in the ISO 12168 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv © ISO 2019 – All rights reserved

Plain bearings — Hydrostatic plain journal bearings without
drainage grooves under steady-state conditions — Part 2:
Characteristic values for the calculation of oil-lubricated plain
journal bearings without drainage grooves
1 Scope
This document lists, in graphic form, characteristic values used in the calculation of oil‐lubricated plain
bearings without drainage grooves.
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 Characteristic values
The characteristic values are shown in Figures 1 to 19 and Table 1.
The characteristic values given in this document are necessary for the calculation of oil‐lubricated
hydrostatic plain journal bearings in accordance with ISO 12168‐1. They are based on the premises and
boundary conditions specified therein. The values required for the calculation can be determined from
the diagrams. Explanations concerning the symbols and calculation examples are included in
ISO 12168‐1. When designing a plain bearing, the characteristic values listed in Table 1 can be used for
optimized bearings.
© ISO 2019 – All rights reserved 1

Deleted: 12168‐2_ed2fig1.eps¶
Formatted: Font:
Key
Deleted: 12168‐2_ed2key1a.eps
approximate solution
Formatted: Font: Bold
Deleted: 12168‐2_ed2key1b.eps
more precise solution
Formatted: Font: Bold
*
Figure 1 — Characteristic values of load-carrying capacity F as a function of the relative
eccentricity ε for different relative frictional pressures π and Z = 4; B/D = 1; lax/B = 0,15;
Deleted: =
f
[2]
l/B = 0,25; ξ = 1; α = 0
c
2 © ISO 2019 – All rights reserved

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