PDF GB/T 25763-2024 English (GB/T 25763-2010: Older version)
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Rolling bearings - Needle roller bearings for automotive transmission
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GB/T 25763-2024: PDF in English (GBT 25763-2024) GB/T 25763-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
CCS J 11
Replacing GB/T 25763-2010
Rolling bearings - Needle roller bearings for automotive
transmission
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 ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Symbols ... 7
5 Classification of needle roller bearings for transmission ... 7
6 Identification code ... 8
6.1 Code composition ... 8
6.2 Type code and size series code ... 8
6.3 Post-codes ... 9
6.4 Code example ... 9
7 Structural type ... 11
8 Dimensions ... 19
9 Technical requirements ... 19
9.1 Materials and heat treatment ... 19
9.2 Tolerance ... 20
9.3 Needle roller surface shape ... 22
9.4 Surface roughness ... 22
9.5 Clearance... 23
9.6 Residual magnetism ... 23
9.7 Cleanliness ... 23
9.8 Rotational flexibility ... 23
9.9 Appearance quality ... 23
9.10 Life ... 23
9.11 Others ... 24
10 Testing method ... 24
10.1 Tolerance measurement ... 24
10.2 Measurement of needle roller convexity ... 25
10.3 Measurement of surface roughness ... 25
Rolling bearings - Needle roller bearings for automotive
transmission
1 Scope
This document specifies the identification code, structure type, overall dimensions,
technical requirements, detection methods, inspection rules, markings and anti-rust
packaging of needle roller bearings for automotive transmissions.
This document applies to the manufacture of needle roller bearings for automotive
transmissions (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 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 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
GB/T 4604.1-2012 Rolling bearings - Internal clearance - Part 1: Radial internal
clearance for radial bearings
GB/T 4605-2003 Rolling bearings - Thrust needle roller and cage assemblies, thrust
washers
GB/T 6930-2024 Rolling bearings - Vocabulary
GB/T 7811-2015 Rolling bearings - Symbols for physical quantities
GB/T 8597-2013 Rolling bearings - Rust proof packaging
GB/T 20056-2015 Rolling bearings - Radial needle roller and cage assemblies -
Boundary dimensions and tolerances
GB/T 24605-2009 Rolling bearings - Marking for products
GB/T 24607-2023 Rolling bearings - Test and assessment for life and reliability
GB/T 25769-2010 Rolling bearings - Measuring methods for radial internal
clearance
GB/T 28268-2012 Rolling bearings - Specifications of pressed cages
GB/T 33624-2017 Rolling bearings - Test and assessment methods for cleanliness
GB/T 34891-2017 Rolling bearings - Parts made from high-carbon chromium
bearing steels - Specifications for heat treatment
JB/T 6639-2015 Rolling bearings - Rubber seals reinforced with a sheet steel insert
- Specifications
JB/T 6641-2017 Rolling bearings - Residual magnetism and its assessment method
JB/T 7048-2011 Rolling bearings - Engineering plastic cages - Specifications
JB/T 7051-2006 Rolling bearing parts - Methods for the measurement and
assessment of surface roughness
JB/T 7363-2023 Rolling bearing parts carbonitriding heat treatment technical
specifications
JB/T 8211-2023 Rolling bearings - Thrust cylindrical roller and cage assemblies and
thrust washers
JB/T 8878-2011 Rolling bearings - Drawn cup needle roller bearings -
Specifications
JB/T 8881-2020 Rolling bearings, carburized bearing steel parts, heat treatment
technical conditions
JB/T 10336-2017 Rolling bearings - Supplementary specifications
3 Terms and definitions
The terms and definitions defined in GB/T 4199-2003 and GB/T 6930-2024 apply to
this document.
4 Symbols
The symbols given in GB/T 4199-2003 and GB/T 7811-2015, as well as the following
symbols, apply to this document.
B1: Distance from the inner side of the rib to the small end face
di: Inner ring raceway diameter
T: Height of thrust needle roller bearing assembly
5 Classification of needle roller bearings for transmission
5.1 Classification by use conditions:
a) Radial needle roller bearings for shaft end support - When subjected to radial load,
the bearing rotates relative to the shaft or hole;
b) Radial needle roller bearings for idler gears and planetary gears - When subjected
to radial load, the bearing rotates relative to the shaft or hole;
c) Radial needle roller bearings for gears - When subjected to radial load, the bearing
does not rotate relative to the shaft or hole;
d) Thrust needle roller bearings for gear end faces and other end faces - Subjected to
axial loads.
5.2 Classification by structural type is as follows:
a) Solid ring needle roller bearing;
b) Drawn outer ring needle roller bearing;
c) Radial needle roller and cage assembly;
d) Radial needle roller and cage assembly and inner ring;
e) Thrust needle roller and cage assembly, thrust needle roller bearing assembly and
thrust washer.
8 Dimensions
The dimensions of the bearings shall comply with the product drawings.
9 Technical requirements
9.1 Materials and heat treatment
9.1.1 Bearing rings and needle rollers
9.1.1.1 Solid rings and needle rollers 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 surface of needle rollers and rings may also be treated by
other processes such as nitriding and carbonitriding; their heat treatment quality shall
comply with JB/T 7363-2023 or product drawings.
9.1.1.2 The solid ring can also be made of low carbon alloy steel such as 15CrMo,
20CrMo, etc. in accordance with GB/T 3077-2015. After carburizing heat treatment, its
heat treatment quality shall comply with the provisions of JB/T 8881-2020.
9.1.1.3 The drawn outer ring is generally made of low carbon steel plate (or steel strip)
in accordance with GB/T 13237-2013; it can also be made of low carbon alloy steel
plate (or steel strip) such as 15CrMo, 20CrMo, etc. in accordance with GB/T 3077-
2015. After carburizing and carbonitriding heat treatment, its heat treatment quality
shall comply with the provisions of JB/T 7363-2023.
9.1.1.4 The thrust washer is made of 65Mn, T7A, T8A and other steel strips in
accordance with YB/T 5058-2005 or other materials with equivalent performance. The
surface hardness of the raceway after heat treatment is 670 HV10 ~ 810 HV10.
9.1.2 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; its heat treatment quality shall comply with the provisions of
JB/T 7363-2023.
9.1.3 Sealing ring
The sealing ring is made of nitrile rubber in accordance with JB/T 6639-2015; it can
also be made of other materials with equivalent or better performance.
shall comply with the provisions of GB/T 307.2-2005; the rest shall comply with the
provisions of JB/T 8878-2011.
10.1.3 The measurement method of the tolerance of the radial needle roller and cage
assembly shall comply with the provisions of GB/T 20056-2015.
10.1.4 The measurement method of the tolerance of the thrust needle roller bearing
assembly shall comply with the provisions of GB/T 4605-2003.
10.2 Measurement of needle roller convexity
Place the needle roller to be measured on the measuring instrument; adjust the needle
roller so that the two ends of the needle roller line are at the same horizontal position.
On the plane passing through the axis of the needle roller, the measuring head of the
measuring instrument measures the entire length of the outer surface of the needle roller
to be measured, except for the chamfer. The difference between the measured values at
both ends of the element line and the middle is the convexity value.
10.3 Measurement of surface roughness
The measurement method of the bearing surface roughness shall comply with the
provisions of JB/T 7051-2006.
10.4 Measurement of clearance
The measurement method of the bearing radial clearance shall comply with the
provisions of GB/T 25769-2010.
10.5 Measurement of residual magnetism
The measurement method of the bearing residual magnetism shall comply with the
provisions of JB/T 6641-2017.
10.6 Cleanliness test
The filter membrane with an aperture of 5 μm is used for testing. The other
measurement methods shall comply with the provisions of GB/T 33624-2017; it can
also be performed according to the user's requirements.
10.7 Inspection of rotational flexibility
10.7.1 The inspection method of rotational flexibility of radial needle roller and cage
assembly shall comply with the provisions of GB/T 20056-2015.
10.7.2 Press the drawn outer ring needle roller bearing into the ring gauge (ring gauge
size = lower deviation value of bearing outer diameter D-N6); insert the plug gauge
with size Fw; make the axis of the bearing (together with the ring gauge and plug gauge)
horizontal; keep the plug gauge stationary; rotate the ring gauge for several cycles, to
check the rotational flexibility.
10.8 Inspection of appearance quality
Visual inspection under diffuse light or inspection with special equipment.
10.9 Life test
10.9.1 The fatigue life test method of bearings (except needle roller bearings for gears)
shall comply with the provisions of GB/T 24607-2023.
10.9.2 The bench test of bearing gearbox shall be in accordance with user requirements.
10.9.3 The endurance life test of the bearing on the actual vehicle shall be carried out
according to the user's requirements.
11 Inspection rules
11.1 Exit-factory inspection
The bearing shall be inspected and qualified by the quality inspection department of the
manufacturer and accompanied by a certificate of conformity before it can be exit-
factory. The exit-factory inspection items and inspection methods shall be in accordance
with the provisions of Table 12 and Table 13. The sampling plan shall comply with the
provisions of GB/T 2828.1-2012. The normal inspection one-time sampling plan shall
be adopted; the general inspection level II shall be used. The acceptance quality limit
AQL value of the main inspection items is 1.5; the acceptance quality limit AQL value
of the secondary inspection items is 2.5. The sampling plan for cleanliness shall comply
with the provisions of GB/T 33624-2017.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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