GB/T 304.9-2021 PDF in English
GB/T 304.9-2021 (GB/T304.9-2021, GBT 304.9-2021, GBT304.9-2021)
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| GB/T 304.9-2021 | English | 185 |
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Spherical plain bearings -- Part 9：General technical regulations
| Valid |
| GB/T 304.9-2008 | English | 279 |
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Spherical plain bearings -- General technical regulations
| Obsolete |
| GB/T 304.9-1981 | English | 279 |
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Spherical plain radial bearings, joint type. technical requirement
| Obsolete |
Standards related to (historical): GB/T 304.9-2021
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GB/T 304.9-2021: PDF in English (GBT 304.9-2021) GB/T 304.9-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.10
CCS J 11
Replacing GB/T 304.9-2008
Spherical Plain Bearings – Part 9: General Technical
Regulations
ISSUED ON: DECEMBER 31, 2021
IMPLEMENTED ON: JULY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 8
4 Spherical Plain Bearings ... 8
5 Application of Spherical Plain Bearings ... 17
Spherical Plain Bearings – Part 9: General Technical
Regulations
1 Scope
This Document specifies general technical regulations for spherical plain bearings.
This Document is applicable to the production, inspection and user acceptance of general-
purpose spherical plain bearings.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 274 Rolling Bearings – Chamfer Dimension – Maximum Values
GB/T 304.1 Spherical Plain Bearings – Classification
GB/T 304.2 Spherical Plain Bearings – Identification Code
GB/T 304.3 Spherical Plain Bearings – Fits
GB/T 307.2 Rolling Bearings - Measuring and Gauging Principles and Methods
GB/T 699 Quality Carbon Structure Steels
GB/T 1220 Stainless-Steel Bars
GB/T 1800.2-2020 Geometrical Product Specifications (GPS) - ISO Code System for
Tolerances on Linear Sizes - Part 2: Tables of Standard Tolerance Classes and Limit
Deviations for Holes and Shafts
GB/T 3077 Alloy Structure Steels
GB/T 3086 High Carbon Chromium Stainless Bearing Steels
GB/T 3203 Carburizing Steels for Bearing
GB/T 3944 Spherical Plain Bearings – Vocabulary
GB/T 4199 Rolling Bearings – Tolerances – Definitions
GB/T 8597 Rolling Bearings – Rust Proof Packaging
GB/T 9161 Spherical Plain Bearings – Rod Ends Spherical Plain Bearings
GB/T 9162 Spherical Plain Bearings – Thrust Spherical Plain Bearings
GB/T 9163 Spherical Plain Bearings – Radial Spherical Plain Bearings
GB/T 9164 Spherical Plain Bearings – Angular Contact Radial Spherical Plain Bearings
GB/T 9799 Metallic and Other Inorganic Coatings - Electroplated Coatings of Zinc with
Supplementary Treatments on Iron or Steel
GB/T 10125 Corrosion Tests in Artificial Atmospheres - Salt Spray Tests
GB/T 11376 Metallic and Other Inorganic Coatings - Phosphate Conversion Coating of
Metals
GB/T 11379 Metallic Coatings - Electroplated Coatings of Chromium for Engineering
Purposes
GB/T 12765 Spherical Plain Bearings, Joint Type - Abutment and Fillet Dimensions
GB/T 18254 High-Carbon Chromium Bearing Steel
GB/T 24605 Rolling Bearings - Marking for Products
GB/T 24608 Inspection Rules for Rolling Bearings and Commercial Parts
JB/T 6641 Rolling Bearings - Residual Magnetism and its Assessment Method
JB/T 7051 Rolling Bearing Parts - Methods for the Measurement and Assessment of
Surface Roughness
JB/T 8565 Spherical Plain Bearings – Dynamic Load Ratings Life
JB/T 8567 Spherical Plain Bearings – Static Load Ratings
JB/T 10858 Spherical Plain Bearings – Test Code for Static Load
JB/T 10860 Spherical Plain Bearings – Test Code for Dynamic Load and Life
JB/T 14003 Spherical Plain Bearings – Self-Lubricating Bearings of PTFE Fabric Liner
Type
JB/T 14004 Spherical Plain Bearings – Heat Treatment of Parts – Specification
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 3944 and GB/T
4199 apply.
4 Spherical Plain Bearings
4.1 Classification
The classification of spherical plain bearings shall comply with the provisions of GB/T 304.1.
4.2 Identification code
The identification code of spherical plain bearings shall comply with the provisions of GB/T
304.2.
4.3 Appearance dimension
4.3.1 The appearance dimension of radial spherical plain bearings shall comply with the
provisions of GB/T 9163.
4.3.2 The appearance dimension of angular contact spherical plain bearings shall comply with
the provisions of GB/T 9164.
4.3.3 The appearance dimension of thrust spherical plain bearings shall comply with the
provisions of GB/T 9162.
4.3.4 The appearance dimension of rod ends spherical plain bearings shall comply with the
provisions of GB/T 9161.
4.4 Tolerance
4.4.1 The tolerance of radial spherical plain bearings shall comply with the provisions of GB/T
9163.
4.4.2 The tolerance of angular contact spherical plain bearings shall comply with the provisions
of GB/T 9164.
4.4.3 The tolerance of thrust spherical plain bearings shall comply with the provisions of GB/T
9162.
4.4.4 The tolerance of rod ends spherical plain bearings shall comply with the provisions of
GB/T 9161.
20CrMnMo, 20CrNiMo carburized steel specified in GB/T 3077; and G20CrMo, G20CrNiMo
carburized bearing steel specified in GB/T 3203. The quality of heat treatment shall comply
with the provisions of JB/T 14004.
4.8.2 Extrusion outer rings, gasket-inserted outer rings and rod end bodies are generally made
of 45 or 35 high-quality carbon structural steels complying with the provisions of GB/T 699;
and 35CrMo, 40Cr, 40CrNiMoA, 42CrMo quenched and tempered steels specified in GB/T
3077. For parts that need heat treatment, the quality of heat treatment shall comply with the
provisions of JB/T 14004.
4.8.3 The ferrule and rod end body can also be made of other materials that meet the
performance requirements; and the quality of heat treatment is determined by the user and the
manufacturer through consultation.
4.9 Surface treatment
4.9.1 The surface of spherical plain bearing ferrules with sliding contact surface of steel/steel
shall generally be treated with manganese phosphating; and the thickness and surface quality
of the phosphating layer shall meet the requirements of product drawings; the sliding contact
surface shall be coated with molybdenum disulfide.
4.9.2 The outer spherical surface of the inner ring of the self-lubricating spherical plain bearing
shall be plated with hard chromium; and the thickness and surface quality of the coating shall
meet the requirements of the product drawing.
4.9.3 The outer surface of the rod end shall adopt galvanized trivalent chromium passivation or
other environmentally friendly anti-corrosion coatings; and the thickness and surface quality of
the coating shall meet the requirements of the product drawing. After the neutral salt spray test
is carried out according to the provisions of GB/T 10125 for no less than 48 hours, there shall
be no red rust on the external surface of the rod end.
4.9.4 Other surface treatment requirements for spherical plain bearing parts shall be determined
through negotiation between the manufacturer and the user.
4.10 Residual magnetism
The maximum value of residual magnetism of spherical plain bearings shall not exceed the
provisions of Table 7.
The outer ring of the assembled rod end spherical plain bearing shall be closely matched with
the rod end eye; and its circumferential, radial and axial directions shall not be loose. The outer
ring of the installed radial spherical plain bearing is not allowed to expose the end face of the
rod end eye. After the slotted outer ring type radial spherical plain bearing is installed into the
rod end eye, the slotted position of the outer ring shall be perpendicular to the thread axis; and
the deviation shall be no greater than ±10°. For products with marks, the direction of the typing
surface on the eye of the rod end shall generally be consistent with the direction of the typing
surface of the outer ring of the assembled radial spherical plain bearing.
4.15 Other technical requirements
The spherical plain bearings shall rotate and swing flexibly; and other requirements shall
comply with the provisions of product drawings.
4.16 Detection method
4.16.1 Measurement of tolerances
4.16.1.1 The tolerance of spherical plain bearings shall be inspected after finishing, before
surface treatment and slotting; and the measurement method shall be in accordance with the
provisions of GB/T 307.2.
4.16.1.2 The deviation of the actual center height of the rod end can be replaced by measuring
the distance between the bottom of the inner hole and the end of the rod end body plus the
radius of the inner hole.
4.16.1.3 Thread tolerances are to be inspected with thread limit gauges of corresponding grades
after surface treatment.
4.16.2 Measurement of radial clearance
4.16.2.1 The measurement of the radial clearance of self-lubricating slotted radial spherical
plain bearings shall be in accordance with the provisions of JB/T 14003.
4.16.2.2 The measurement of the radial clearance of lubricated slotted radial spherical plain
bearings shall be measured according to the following two methods according to the different
sizes.
a) For bearings with a nominal inner diameter d≤80mm, the bearing needs to be installed in
the corresponding ferrule (the upper limit deviation of the ferrule is the upper limit
deviation value of M7 specified in GB/T 1800.2-2020; and the lower limit deviation is
the upper limit deviation value - 5μm); sealed rings shall be removed before measuring
the sealed bearings. Fix the inner ring; move the outer ring in the diameter direction for
measurement. Measure at three positions 120° apart on the circumference, and the
arithmetic mean value is the radial clearance. The measurement of radial clearance
adopts load measurement; and the measurement load is in accordance with the provisions
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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