GB/T 25764-2024 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 25764-2024 | English | 515 |
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Rolling bearings - Roller bearings for automotive transmissions
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| GB/T 25764-2010 | English | 719 |
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Rolling bearings -- Roller bearings for automotive transmission
| Obsolete |
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GB/T 25764-2024: Rolling bearings - Roller bearings for automotive transmissions---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT25764-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
CCS J 11
Replacing GB/T 25764-2010
Rolling bearings - Roller bearings for automotive
transmissions
ISSUED ON: SEPTEMBER 29, 2024
IMPLEMENTED ON: JANUARY 01, 2025
Issued by: State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword ... 4
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 8
4 Symbols ... 8
5 Classification ... 8
6 Identification code ... 9
6.1 Code composition ... 9
6.2 Type code and size series code ... 9
6.3 Prefix code and postfix code ... 9
6.4 Code examples ... 9
7 Structural type and dimensions ... 10
7.1 Cylindrical roller bearings ... 10
7.2 Tapered roller bearings ... 15
8 Technical requirements ... 17
8.1 Materials and heat treatment ... 17
8.2 Tolerance ... 18
8.3 Chamfer ... 20
8.4 Rolling surface shape ... 20
8.5 Surface roughness ... 21
8.6 Clearance... 21
8.7 Residual magnetism ... 21
8.8 Cleanliness ... 21
8.9 Vibration ... 22
8.10 Friction torque ... 22
8.11 Rotational flexibility ... 22
8.12 Appearance quality ... 23
8.13 Life ... 23
8.14 Others... 23
Rolling bearings - Roller bearings for automotive
transmission
1 Scope
This document specifies the identification code, structure type, overall dimensions,
technical requirements, inspection rules, marking and anti-rust packaging of roller
bearings for automotive transmission; describes the corresponding detection methods.
This document applies to the manufacture of roller bearings for automotive
transmission (hereinafter referred to as "bearings").
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for dated references, only the
version corresponding to that date applies to this document; for undated references, the
latest version (including all amendments) applies to this document.
GB/T 272-2017 Rolling bearings - Identification code
GB/T 274-2023 Rolling bearings - Chamfer dimension - Maximum values
GB/T 283-2021 Rolling bearings - Cylindrical roller bearings - Boundary
dimensions
GB/T 297-2015 Rolling bearings - Tapered roller bearings - Boundary dimensions
GB/T 307.1-2017 Rolling bearings - Radial bearings - Geometrical product
specifications (GPS) and tolerance values
GB/T 307.2-2005 Rolling bearings - Measuring and gauging principles and methods
GB/T 307.3-2017 Rolling bearings - General technical regulations
GB/T 959.1-2017 Specifications for retaining rings - Circlips
GB/T 2828.1-2012 Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 4199-2003 Rolling bearings - Tolerances - Definitions
8.1.1.1 Solid rings should be made of high carbon chromium bearing steel in accordance
with GB/T 18254-2016; their heat treatment quality shall comply with GB/T 34891-
2017. The ring surface can also be treated by nitriding, carbonitriding and other heat
treatment processes; its heat treatment quality shall comply with JB/T 7363-2023 or
product drawings.
8.1.1.2 Tapered roller bearing rings can also be made of low carbon alloy steels such as
15CrMo and 20CrMo in accordance with GB/T 3077-2015. After carburizing heat
treatment, its heat treatment quality shall comply with JB/T 8881-2020.
8.1.1.3 The drawn rings of drawn outer ring cylindrical roller bearings should be made
of low carbon alloy steels such as 15CrMo and 20CrMo in accordance with GB/T 3077-
2015. After carburizing and carbonitriding heat treatment, the heat treatment quality
shall comply with the provisions of JB/T 7363-2023.
8.1.2 Rolling elements
The rolling elements should be made of high carbon chromium bearing steel in
accordance with GB/T 18254-2016; the heat treatment quality shall comply with the
provisions of GB/T 34891-2017.
8.1.3 Cage
The cage can be made of engineering plastics or metal. When the cage is made of
engineering plastics, its material shall comply with the provisions of JB/T 7048-2011;
when the cage is made of low carbon steel, its material shall comply with the provisions
of GB/T 28268-2012; it may also be made of other materials with equivalent or better
performance. When the cage is made of copper alloy material, its material shall comply
with the provisions of the product drawing.
8.1.4 Elastic lock ring
The elastic lock ring should be made of materials that comply with the provisions of
Table 1 in GB/T 959.1-2017; its heat treatment and related properties shall comply with
the provisions of GB/T 959.1-2017.
8.2 Tolerance
8.2.1 Bearing tolerance
8.2.1.1 The tolerance of the bearing shall not be lower than the provisions of the
ordinary grade tolerance in GB/T 307.1-2017.
8.2.1.2 The tolerance of the outer diameter Ew of the roller set of RN and RND
cylindrical roller bearings shall be .
8.12 Appearance quality
The working surface of the bearing shall not have cracks, rust, obvious bumps.
8.13 Life
8.13.1 After the conventional life test of the bearing, the ratio -- of the test value of its
rated life to the basic rated life L10 t/L10 h shall not be less than 2. If the user has special
requirements, it can also be determined by negotiation with the manufacturer.
8.13.2 The life of the bearing bench simulation test shall meet the requirements of the
corresponding vehicle model.
8.13.3 The durability life of the actual vehicle bearing shall meet the requirements of
the corresponding vehicle model.
8.14 Others
8.14.1 The technical conditions of the matching between shaft and the bearing seat and
the bearing hole are shown in Appendix A.
8.14.2 Other technical requirements shall comply with the provisions of GB/T 307.3-
2017 and JB/T 10336-2017.
8.14.3 When the user has other requirements for the bearing, it can be negotiated with
the manufacturer.
9 Testing methods
9.1 Measurement of tolerances
The measurement of bearing tolerances shall be in accordance with the provisions of
GB/T 307.2-2005.
9.2 Inspection of roller sag
9.2.1 The roller sag can be replaced by the maximum and minimum values of the inner
and outer diameters of the roller group with a stop gauge before the bearing is
assembled.
9.2.2 For cylindrical roller bearings without outer rings or with detachable outer rings,
9.3 Chamfer detection
The chamfer detection method shall comply with the provisions of GB/T 307.2-2005.
9.4 Measurement of rolling surface shape
The measurement method of the rolling surface shape of the bearing can refer to the
measurement method of the crowned roller in GB/T 4661-2015.
9.5 Measurement of surface roughness
The measurement method of the bearing surface roughness shall comply with the
provisions of JB/T 7051-2006.
9.6 Measurement of clearance
9.6.1 Radial clearance
The measurement method of the radial clearance of the bearing shall comply with the
provisions of GB/T 25769-2010.
9.6.2 Axial clearance
9.6.2.1 The measurement of the axial clearance of the NUP cylindrical roller bearing is
shown in Figure 18. During the measurement, the end face of the outer ring of the
bearing is pressed tightly; then the measuring load Q (100 N) is alternately applied to
the inner ring of the bearing with uniform force, so that the inner ring of the bearing
moves up and down along the loading direction. The difference between the average
values of the two positions read from the indicator is the axial clearance value.
9.6.2.2 The measurement method of the axial clearance of double-row tapered roller
bearings shall comply with the provisions of JB/T 8236-2023, or according to the user's
requirements.
the plug gauge to keep it still; rotate the ring gauge for several cycles; check the rotation
flexibility of the bearing.
9.11.5 HKN type bearings
First press the bearing into the ring gauge (ring gauge size = bearing outer diameter D
- N6 lower deviation value); then insert the plug gauge (plug gauge size = Fw lower
deviation value - 0.015 mm) into the bearing (already pressed into the ring gauge), so
that the axis of the bearing (together with the ring gauge and plug gauge) is in the
horizontal direction; fix the plug gauge to keep it still; rotate the ring gauge for several
cycles; check the rotation flexibility of the bearing.
9.11.6 30000, R 30000, 350000 R type bearings
Support the back of the inner ring of the bearing; keep the inner ring of the bearing still;
rotate the outer ring (R 30000 type bearing is the standard outer ring) for several cycles;
check the rotation flexibility of the bearing.
9.12 Inspection of appearance quality
Visually inspect under a diffuse light or use special equipment to inspect.
9.13 Life test
9.13.1 The bearing fatigue life test method shall comply with the provisions of GB/T
24607-2023.
9.13.2 The bearing gearbox bench simulation life test shall comply with the user's
requirements.
9.13.3 The bearing actual vehicle endurance life test shall comply with the user's
requirements.
10 Inspection rules
10.1 Exit-factory inspection
The bearing shall be inspected and qualified by the quality inspection department of the
manufacturer and attached with a certificate of conformity before it can be exit-factory.
The sampling items for exit-factory inspection shall be in accordance with the
provisions of Table 16 (cylindrical roller bearings) and Table 17 (tapered roller
bearings). The sampling shall be in accordance with the provisions of GB/T 2828.1-
2012. The normal inspection one-time sampling plan shall be adopted; the general
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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