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Plain bearing - Hydrodynamic plain journal circular cylindrical bearings under steady-state conditions - Part 2: Functions used in the calculation procedure
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Hydrodynamic plain journal bearings under steady-steady-state conditions -- Circular cylindrical bearings -- Part 2: Functions used in the calculation procedure
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Basic data
| Standard ID | GB/T 21466.2-2025 (GB/T21466.2-2025) |
| Description (Translated English) | Plain bearing - Hydrodynamic plain journal circular cylindrical bearings under steady-state conditions - Part 2: Functions used in the calculation procedure |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | J12 |
| Classification of International Standard | 21.100.10 |
| Word Count Estimation | 70,781 |
| Date of Issue | 2025-10-31 |
| Date of Implementation | 2026-02-01 |
| Older Standard (superseded by this standard) | GB/T 21466.2-2008 |
| Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China |
GB/T 21466.2-2025: Plain bearing - Hydrodynamic plain journal circular cylindrical bearings under steady-state conditions - Part 2: Functions used in the calculation procedure
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 21.100.10
CCSJ12
National Standards of the People's Republic of China
Replaces GB/T 21466.2-2008
Fluid dynamic radial pressure under steady-state conditions of sliding bearings
Cylindrical bearings, Part 2.Characteristic values
procedure
Released on October 31, 2025; to be implemented on February 1, 2026.
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
Introduction IV
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Bearing Characteristic Parameter Table 1
5.Bearing characteristic parameters diagram 9
6.Friction power consumption 58
7.Oil supply pressure side leakage flow rate at the oil inlet tank. 58
7.1 General Rules 58
7.2 Single oil inlet 58 opposite to the bearing load direction
7.3 Single oil inlet hole 59 at 90° to bearing load
7.4 Double oil inlet holes at 90° to bearing load 60
7.5 Axial center circumferential complete oil inlet groove 60
7.6 Axial center circumferential oil inlet groove 61
7.7 Single oil inlet chamber 61 opposite to the bearing load direction
7.8 Single oil inlet chamber 62 at 90° to bearing load
7.9 Dual oil inlet chambers at ±90° to bearing load 63
8.Temperature-viscosity relationship of lubricating oil 63
References 65
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document is Part 2 of GB/T 21466 "Sliding bearings - hydrodynamic radial cylindrical bearings under steady-state conditions".
GB/T 21466 has published the following parts.
---Part 1.Calculation Process;
---Part 2.Characteristic Values;
---Part 3.Permitted Operating Parameters.
This document replaces GB/T 21466.2-2008 "Fluid hydrodynamic radial sliding bearings under steady-state conditions - Part 2"
The main technical changes in the standard "Functions Used in the Calculation Process" compared to GB/T 21466.2-2008, aside from structural adjustments and editorial changes, are as follows.
as follows.
---Added "The symbols and descriptions in Table 1 of GB/T 21466.1-2025 apply to this document" (see Chapter 4).
This document is modified to adopt ISO 7902-2.2020 "Hydrodynamic radial sliding bearings under steady-state conditions - Cylindrical bearings - Part 2.
Characteristic values.
The technical differences between this document and ISO 7902-2.2020, and the reasons therefor, are as follows.
---ISO 7902-1.2020 has been replaced with the normatively referenced GB/T 21466.1-2025 (see Chapter 4), between the two documents
The consistency level is modified to increase operability.
The following editorial changes have been made to this document.
---To align with existing standards, the standard name has been changed to "Plain Condition Standard for Hydrodynamic Radial Cylindrical Bearings under Steady-State Conditions" (Category 2).
Part. Feature Values;
---Added numbering to some formulas in the file.
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Standardization of Sliding Bearings (SAC/TC236).
This document was drafted by. China Machinery Productivity Promotion Center Co., Ltd., Xi'an Jiaotong University, Shenke Sliding Bearing Co., Ltd., and Hunan Province.
Chongde Technology Co., Ltd., Zhuji Bearing Factory Co., Ltd. of Zhejiang Province, CGN Nuclear Power Operation Co., Ltd., and Zhejiang Zhongda Precision Components Co., Ltd.
Joint-stock company, Zhejiang Shenfa Bearing Co., Ltd., 703 Research Institute of China Shipbuilding Group Corporation, Linxi County Anzhongda Automobile Co., Ltd.
Automotive parts company.
This document is subject to interpretation by the National Technical Committee on Standardization of Sliding Bearings.
This document was first published in.2008, and this is its first revision.
Introduction
GB/T 21466 "Sliding bearings - hydrodynamic radial cylindrical bearings under steady-state conditions" is proposed to consist of three parts.
---Part 1.Calculation Process. The purpose is to establish the calculation process for the performance of hydrodynamic oil-lubricated sliding bearings.
---Part 2.Characteristic Values. The purpose is to establish the calculation process for hydrodynamic cylindrical radial sliding bearings under fully lubricated conditions.
The basic function values used in the text.
---Part 3.Permissible Operating Parameters. The purpose is to establish the permissible operating parameters for hydrodynamic cylindrical radial sliding bearings under fully lubricated conditions.
Empirical values for minimum film thickness, maximum allowable temperature, and maximum allowable specific pressure.
Fluid dynamic radial pressure under steady-state conditions of sliding bearings
Cylindrical bearings, Part 2.Characteristic values
1 Scope
This document specifies the basic function values used in the calculation of hydrodynamic radial sliding bearings and cylindrical bearings under fully lubricated conditions.
The assumptions and boundary conditions corresponding to these values are given in GB/T 21466.1.The parameter values necessary for the calculation process can be obtained from the bearing.
The characteristics are obtained from the tables, graphs, and formulas.
For descriptions and calculation examples of the symbols used, see GB/T 21466.1.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 21466.1-2025 Sliding bearings - Hydrodynamic radial cylindrical bearings under steady-state conditions - Part 1.Calculation process
(ISO 7902-1.2020, MOD)
3 Terms and Definitions
This document does not contain any terms or definitions that need to be defined.
4.Bearing Characteristic Parameter Table
The symbols and explanations in Table 1 of GB/T 21466.1-2025 apply to this document.
Tables 1 through 30 show the variations of the following parameters with eccentricity ε, bearing wrap angle Ω, and width-to-diameter ratio B/D.
---Offset angle β;
---Somerfield number So;
---Consider the total friction coefficient f'/ψ in both the load-bearing and non-load-bearing zones of the oil film;
---Considering only the friction coefficient f/ψ in the oil film bearing area;
---Dimensionless oil film pressure side leakage flow rate Q*3.
Table 1.Basic parameter values when Ω=360° and B/D=1.5
ε β So f'/ψ f/ψ Q*3
0.2
0.4
0.6
0.8
0.9
0.925
0.95
72.5236
62.6588
51.9692
27.961
24.6184
19.8007
0.4273
1.0005
1.9724
10.1382
13.8256
22.044
7.5992
3.6035
2.2272
0.9218
0.7906
0.6173
0.404
2.6582
1.6695
1.0736
0.6678
0.5359
0.3586
0.0935
0.1361
0.1759
0.198
0.201
0.203
...
