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This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces JB/T 3232-2006 Rolling bearings - Needle roller bearings for universal joints, and the following main technical changes have been made with respect to JB/T 3232-2006:
——The contents related to W type needle roller bearings for universal joints are deleted (see 4.1, 5.4 and 7.3.2 of Edition 2006);
——Post codes “PP” and “PP1” and their meanings are deleted (see Table 2 of Edition 2006);
——Some models are added or deleted and the dimensions of some models are modified (see Table 3; Table 3 of Edition 2006);
——The bearing model WY is changed to WY…ZC (see Table 5; Figure 6 and Table 5 of Edition 2006);
——Bearing models WY…PP are deleted (see Figure 7 and Table 5 of Edition 2006);
——The carbide grade requirements, metallographic structure evaluation method of carburized and hardened case and roller path surface hardness of GCr15 outer ring are revised, and the depth requirements of decarburization case after quenching and tempering of outer ring are deleted (see 6.1.1.2; 6.1.1.2 of Edition 2006);
——The requirements related to seal ring skeleton are deleted (see 6.3.2 of Edition 2006);
——The assembly chamfer tolerance of needle roller bearings for universal joints is modified (see Table 11; Table 13 of Edition 2006).
This standard was proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee on Rolling Bearing of Standardization Administration of China (SAC/TC 98).
The previous editions of this standard are as follows:
——JB 3232-1983, JB/T 3232-1994, JB/T 3232-2006.
Rolling bearings - Needle roller bearings for universal joints
1 Scope
This standard specifies the symbols, coding methods, structural styles, basic dimensions, technical requirements, measurement methods, inspection rules, marking, rust prevention and packaging of cross-shaft needle roller bearings without inner ring for universal joints (hereinafter referred to as needle roller bearings for universal joints).
It is applicable to the production, inspection and acceptance of needle roller bearings for universal joints.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 307.2-2005 Rolling bearings - Measuring and gauging principles and methods
GB/T 309-2000 Rolling bearings - Needle rollers
GB/T 700-2006 Carbon structural steels
GB/T 3077-2015 Alloy structure steels
GB/T 5671-2014 General purpose lithium lubricating grease for automobile
GB/T 7811-2015 Rolling bearings - Symbols for physical quantities
GB/T 8597-2013 Rolling bearings - Rust proof packaging
GB/T 9450-2005 Steels - Determination and verification of the depth of carburized and hardened cases
GB/T 18254-2002 High-carbon chromium bearing steel
GB/T 18579-2001 High-carbon chromium bearing steel wires
GB/T 24605-2009 Rolling bearings - Marking for products
GB/T 24608-2009 Inspection rules for rolling bearings and commercial parts
GB/T 25744-2010 Metallographic examination for carburizing quenching and tempering of steel parts
JB/T 1255-2014 Rolling bearings - Parts made from high-carbon chromium bearing steels - specifications for heat treatment
JB/T 6050-2006 Generalization of hardness test for heat treated iron and steel parts
JB/T 6639-2015 Rolling bearings - Skeleton rubber seal - Specifications
3 Symbols
For the purposes of this document, the symbols given in GB/T 7811-2015 and the following apply.
B: nominal bearing width.
b: nominal width of outer ring.
b0: effective bottom thickness of outer ring.
b1: distance between the inner bottom surface and the stop groove of outer ring.
C: bottom plate groove width of outer ring.
D: nominal outside diameter of bearing.
D1: diameter of outer ring stop groove.
FW: inner diameter of needle roller group.
FWsmin: minimum single inner diameter of needle roller group.
H: width of outer ring stop groove.
L: bottom flat groove depth of outer ring.
M: center distance between two holes of cover plate.
r0: fillet radius of stop groove bottom.
ΔBs: single width deviation of bearing.
Δbs: single width deviation of outer ring.
Δb0s: deviation of single effective bottom thickness of outer ring.
Δb1s: single distance deviation between the bottom surface of outer ring and the stop groove.
ΔCs: single width deviation of bottom plate groove of outer ring.
ΔFWsmin: minimum single inner diameter deviation of needle roller group (the difference between FWsmin and FW).
ΔHs: single width deviation of outer ring stop groove.
ΔLs: single depth deviation of bottom plate flat groove of outer ring.
ΔMs: deviation of single center distance between two holes of cover plate.
4 Coding method
4.1 General
The code of needle roller bearings for universal joints consists of front code, basic code and post code.
4.2 Front code
Capitalized Latin letters are used in the front code to indicate the structural style of needle roller bearings for universal joints, as shown in Table 1.
Table 1 Front code
Front code Meaning
WW Outside circlips type needle roller bearings for universal joints
WN Inside circlips type needle roller bearings for universal joints
WY Pressure plate type needle roller bearings for universal joints
WT Loose back plate type needle roller bearings for universal joints
WD Spot welded cover plate type needle roller bearings for universal joints
4.3 Basic code
The basic code is expressed by four Arabic numbers, of which the first two numbers represent the millimeters of inner diameter of needle roller group (FW) (rounded according to digital rounding rule), and the last two numbers represent the millimeters of nominal bearing width (B) (rounded according to digital rounding rule).
4.4 Post code
The post code is expressed by Latin letters and numbers, as shown in Table 2.
Table 2 Post code
Post code Meaning
ZC With stamping cover
T With retaining ring
RS With rectangular lip metal cover seal ring
LS With inner skeleton seal ring
PP2 With U-shaped seal ring
R The outer ring has a flange
/A The internal structure is changed
/Y The outline structure is changed
4.5 Label example
Example:
Needle roller bearings for universal joints WN 2026 T/AY JB/T 3232-2017
5 Structural styles and basic dimensions
5.1 The common structural styles of outside circlips type needle roller bearings for universal joints are shown in Figures 1 and 2, and the basic dimensions are shown in Table 3.
Figure 1 Type WW…RS
Figure 2 Type WW…PP2
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Table 3 Basic dimensions of outside circlips type needle roller bearings for universal joints
In: mm
Bearing model Basic dimension
FW D b b0 B
a Non-preferred model
5.2 The common structural styles of inside circlips type needle roller bearings for universal joints are shown in Figures 3~5, and the basic dimensions are shown in Table 4.
Figure 3 Type WN…T
Figure 4 Type WN…PP2
Figure 5 Type WN…RS
?
Table 4 Basic dimensions of inside circlips type needle roller bearings for universal joints
In: mm
Bearing model Basic dimension
FW D b b1 D1 H B r0max
a Non-preferred model
5.3 The common structural styles of pressure plate type needle roller bearings for universal joints are shown in Figures 6 and 7, and the basic dimensions are shown in Table 5.
Foreword i
1 Scope
2 Normative references
3 Symbols
4 Coding method
4.1 General
4.2 Front code
4.3 Basic code
4.4 Post code
4.5 Label example
5 Structural styles and basic dimensions
6 Technical requirements
6.1 Material and heat treatment
6.2 Needle roller
6.3 Tolerance
6.4 Surface roughness of roller path surface, outer cylindrical surface and outer bottom surface
6.5 Total circumferential clearance of needle roller group
6.6 Sealing performance
6.7 Lubrication performance
6.8 Minimum torque borne by the cover plate and outer ring of spot welded cover plate needle roller bearings for universal joints after welding
6.9 Others
7 Measurement methods
7.1 Minimum single inner diameter deviation of needle roller group
7.2 Radial circular runout of matching outer ring of needle roller bearings for universal joints
7.3 Total circumferential clearance of needle roller group
7.4 Minimum torque borne by the cover plate and outer ring of spot welded cover plate needle roller bearings for universal joints after welding
7.5 Heat treatment quality
8 Inspection rules
9 Marking, rust prevention and packaging
Figure 1 Type WW…RS
Figure 2 Type WW…PP
Figure 3 Type WN…T
Figure 4 Type WN…PP
Figure 5 Type WN…RS
Figure 6 Type WY…ZC
Figure 7 Type WY…RS
Figure 8 Type WT…RS
Figure 9 Type WT…PP
Figure 10 Type WD…PP
Figure 11 Type WD…RS
Figure 12 Structure of cover plate
Figure 13 Measurement method of radial circular runout
Table 1 Front code
Table 2 Post code
Table 3 Basic dimensions of outside circlips type needle roller bearings for universal joints
Table 4 Basic dimensions of inside circlips type needle roller bearings for universal joints
Table 5 Basic dimensions of pressure plate type needle roller bearings for universal joints
Table 6 Basic dimensions of loose back plate type needle roller bearings for universal joints
Table 7 Basic dimensions of spot welded cover plate type needle roller bearings for universal joints
Table 8 Tolerance of outer ring
Table 9 Width deviation
Table 10 Minimum single inner diameter deviation of needle roller group
Table 11 Deviation of assembly chamfer
Table 12 Inspection items
