ISO 12131-2:2016

Plain bearings — Hydrodynamic plain thrust pad bearings under steady-state conditions — Part 2: Functions for the calculation of thrust pad bearings

ISO 12131-2:2016 specifies functions for thrust pad bearings. It also covers the effect of dynamic viscosity on lubricant film temperature.

Paliers lisses — Butées hydrodynamiques à patins géométrie fixe fonctionnant en régime stationnaire — Partie 2: Fonctions pour le calcul des butées à segments

General Information

• Status: Withdrawn
• Publication Date: 15-Sep-2016
• ICS: 21.100.10 - Plain bearings
• Technical Committee: ISO/TC 123/SC 8 - Calculation methods for plain bearings and their applications
• Drafting Committee: ISO/TC 123/SC 8 - Calculation methods for plain bearings and their applications
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 08-Jun-2023

Relations

• Revised: ISO 12131-2:2023 - Plain bearings — Hydrodynamic plain thrust pad bearings under steady-state conditions — Part 2: Functions for the calculation of thrust pad bearings
• Effective Date: 06-Jun-2022
• Consolidated By: ISO 15854:2021 - Dentistry — Casting and baseplate waxes
• Effective Date: 06-Jun-2022
• Revises: ISO 12131-2:2001 - Plain bearings — Hydrodynamic plain thrust pad bearings under steady-state conditions — Part 2: Functions for the calculation of thrust pad bearings
• Effective Date: 12-Dec-2015

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 12131-2
Second edition
2016-09-15
Plain bearings — Hydrodynamic plain
thrust pad bearings under steady-
state conditions —
Part 2:
Functions for the calculation of thrust
pad bearings
Paliers lisses — Butées hydrodynamiques à patins géométrie fixe
fonctionnant en régime stationnaire —
Partie 2: Fonctions pour le calcul des butées à segments
Reference number
ISO 12131-2:2016(E)
©
ISO 2016

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ISO 12131-2:2016(E)

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© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved

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ISO 12131-2:2016(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Functions for the thrust pad bearing . 1
4 Effective dynamic viscosity of the lubricant, η , as a function of the effective
eff
lubricant film temperature, T . 7
eff
Bibliography .10
© ISO 2016 – All rights reserved iii

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ISO 12131-2:2016(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
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electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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The committee responsible for this document is ISO/TC 123, Plain bearings.
This second edition cancels and replaces the first edition (ISO 12131-2:2001), of which it constitutes a
minor revision.
ISO 12131 consists of the following parts, under the general title Plain bearings — Hydrodynamic plain
thrust pad bearings under steady-state conditions:
— Part 1: Calculation of thrust pad bearings
— Part 2: Functions for the calculation of thrust pad bearings
— Part 3: Guide values for the calculation of thrust pad bearings
iv © ISO 2016 – All rights reserved

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ISO 12131-2:2016(E)

Introduction
Assuming hydrodynamic conditions with full lubrication, the functions of the type covered by this part
of ISO 12131 are necessary for the calculation of oil-lubricated pad thrust bearings in accordance with
ISO 12131-1. They are based on the premises and boundary conditions specified. The values necessary
for the calculation can be determined by means of the given formulae, as well as from diagrams and
tables. The formulae in this part of ISO 12131 are approximations of the numerically determined values
traced as curves according to Reference [2]. The explanation of the symbols, as well as examples for the
calculation, are included in ISO 12131-1.
© ISO 2016 – All rights reserved v

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INTERNATIONAL STANDARD ISO 12131-2:2016(E)
Plain bearings — Hydrodynamic plain thrust pad bearings
under steady-state conditions —
Part 2:
Functions for the calculation of thrust pad bearings
1 Scope
This part of ISO 12131 specifies functions for thrust pad bearings. It also covers the effect of dynamic
viscosity on lubricant film temperature.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 12131-1, Plain bearings — Hydrodynamic plain thrust bearings under steady-state conditions —
Part 1: Calculation of thrust pad bearings
3 Functions for the thrust pad bearing
*
3.1 Characteristic value of load carrying capacity, , as a function of the relative bearing length, B/L,
F
B
and the relative minimum lubricant film thickness, h /C
min wed
h
min
Approximation of the curves of Figure 1 (range of application: 0,1 ≤  ≤ 10).
C
wed
22
 
 
     
l l l hh l
1
 wed wedwed min wed 
 
××12−  −×  ××2 +×31 − 
22
 
     
Lh /C L L  l L 
   
l h 1 + hC/
minwed wed
      
*  wed min minwed 
F =×5   ×  ×ln +
B
 
    2
L C hC/
   wed  min wwed      
l l
 
1 1
wed wed
42+×43− × +×41 − × 
 
     
Lh //C Lh C
 
  mminwed    minwed 
 
2
   
1 1
** *
AB+×1−  +×C 1− 
2
   
hC//hC  
1
minwed minwed
   
× × 
−2  
hC/
minwed
   
B
1+×α
 
L
 
 2 
 
 
 h h 
 min min 
12−×  +
 
2
 
   
2
 
C C
wed wed
 
   
 
10
h h
 
 min min 
α =  × +  +
 
 
   
2
 
 
 C C 1 +  / 
wed  wed
  h h C
min min wed
 
h
min  
12 ×+  12 ×  × ln − 2 
 
1 + 2 ×
 
 
/
   
C h C
wed min wed
   
 
C
 wed
 
 
© ISO 2016 – All rights reserved 1

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