JB/T 7752-1995 Technical requirements for sealed deep groove ball bearings JB/T7752-1995 Standard download decompression password: www.bzxz.net

JB/T 7752
This standard is a revision of ZBJ11018-89 "Technical requirements for temperature and dustproof test of sealed deep groove ball bearings".
From the date of implementation of this standard, ZBJ11018-89 shall be invalid
Technical conditions", mainly revising the temperature of sealed deep groove ball bearings. Appendix A, Appendix B and Appendix C of this standard are all appendices of the standard. Appendix D of this standard is a reminder appendix.
This standard is proposed by the National Technical Committee for Standardization of Rolling Bearings. This standard is under the jurisdiction of Luoyang Bearing Research Institute of the Ministry of Machinery Industry. Drafting unit of this standard: Luoyang Bearing Research Institute of the Ministry of Machinery Industry. Main drafters of this standard: Zhang Xiangyin and Wang Yujin. This standard was first issued in 1985 and revised for the first time in 1989. This is the second revision. 622
1 Scope
Standard of the Machinery Industry of the People's Republic of China
Technical Conditions
Sealed Deep Groove Ball Bearings
JB/T 7752 1995
Replaces 2BJ11 018---89
This standard specifies the technical conditions for general-purpose contact and non-contact sealed deep groove ball bearings (hereinafter referred to as sealed ball bearings) whose dimensions conform to GB279.
This standard applies to the production inspection and acceptance of sealed ball bearings. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB27988 Rolling bearings Dimensions of deep groove ball bearings with seals GB/T307.1--94 Rolling bearings Tolerances of radial bearings GB307.3-84 Rolling bearings - General technical requirements GB2829--87 Periodic inspection counting sampling procedures and sampling tables (applicable to the inspection of production process stability) GB7324-87 General lithium-based grease
JB/T6639--93 Technical conditions for skeleton rubber seals for deep groove ball bearings ZBJ11020-89 Inspection rules for rolling bearings and their commodity parts SH/T0048-91 Determination of similar viscosity of grease SH/T0336·92 Determination of mechanical impurity content of grease (microscope method) 3 Technical requirements
3.1 The tolerances of sealed ball bearings shall comply with the provisions of GB/T307.1. 3.2 The general technical requirements of sealed ball bearings shall comply with the provisions of GB307.3. 3.3 The vibration level of sealed ball bearings shall comply with the relevant regulations of the competent authorities. 3.4 The sealing rings for sealed ball bearings shall comply with the provisions of B/工6639 and product drawings: The sealing rings on the finished bearings shall be flat, shall not exceed the bearing end face, and shall not contact the cage. 3.5 The grease for sealed ball bearings shall have rust prevention and lubrication properties. The technical indicators of its chemical and physical properties shall comply with the provisions of GB7324 and Table 1.
3.6 The amount of grease filled in the sealed ball bearing shall be 1/5 to 1/2 of the effective space volume of the bearing. 3.7 After grease filling, the sealed ball bearing must be 100% tested for grease uniformity. 3.8 The grease leakage, temperature rise and dustproof performance of the sealed ball bearing shall be tested and evaluated and comply with the provisions of Appendix A, Appendix B, Appendix C or the manufacturer's agreement with the subscriber.
Approved by the Ministry of Machinery Industry on June 16, 1995
Implemented on July 1, 1996
Mechanical impurity content
Similar viscosity/(Pi·s)
(--25 .10 s)
4 Inspection method
10 um or less
JB/T7752
25 um or more
pieces/em
4.1 The outer diameter dimension tolerance and vibration level of sealed ball bearings must be checked after sealing. 4.7.1 The swimming of contact sealed ball bearings must be checked before sealing. 75 +m or more! :
Testing temperature
SH/T 0336
sH/r ot18
4.1.2 The clearance of non-contact sealed ball bearings can be checked before or after sealing. If there is a dispute, the clearance checked before sealing shall prevail. 4.2 The vibration inspection method of sealed ball bearings shall comply with the relevant regulations of the competent authorities. 4.3 The grease filling amount of sealed ball bearings shall be determined by the quality difference before and after the bearing is filled with grease. 4.4 The inspection rules shall be in accordance with the provisions of ZB111020. 4.5 The test assessment of grease leakage, temperature rise and dustproof performance of sealed ball bearings shall be carried out in accordance with the provisions of (B2829, the unqualified quality level RQ1, 25, the discrimination level, the sub-sampling plan, and the sample size of 8. 5 Marking and packaging
5.1 The marking of sealed ball bearings shall comply with the provisions of product drawings. 5.2 The anti-rust packaging of sealed ball bearings shall comply with the provisions of GB307.3, 624
A1 Grease leakage test technical requirements shall be in accordance with Table A1.
Bearing inner diameter
Test speed
30% of the bearing extreme
limit speed
JB/T 7752--- 1995
Appendix A
(Appendix to the standard)
Technical requirements for grease leakage test
Test load/N
Diameter series 0
Diameter series 2.3
When testing, if the outer ring seal groove leaks grease, it is considered unqualified. When testing at an ambient temperature of sub C
, if relative rotation occurs between the seal ring and the outer ring, it is considered unqualified. Appendix B
(Appendix to the standard)
Technical requirements for temperature rise test
Technical requirements for temperature rise test are as per Table B1.
Bearing inner diameter
Test speed
75% of the bearing's extreme
limit speed
Test Test load/N
Diameter series 0
Diameter series 2, 3
Test time/h
[Ambient temperature/(Test time/h
When the grease leakage rate of the temperature rise test exceeds 50%, a separate sampling test shall be carried out. 6bZxz.net
(Grease leakage amount/Tire filling amount)×100%
Non-contact sealContact seal
Non-contact seal
Contact seal
Dustproof test technical requirements are as shown in Table (1.
Bearing inner diameter
Test speed
Contact seal shaft
Bearing limit speed
Dust box
Outer edge linear speed
27~30 m/min
JB/T7752-1995
Appendix C
(Appendix of the standard)
Technical requirements for dustproof test
Test load
Ambient temperature
Add dried 240# chrome corundum to the dust box, and the dust density is 0.4%~~0.7%. The volume of the dust box is not less than 500mL.
C4 Check the mechanical impurity content using the method specified in SH/T0336. During the test
10m dust
Number of particles (n)
Non-contact seal
80 000
Contact seal
.16 o6n
The difference between the impurity content of the grease in the bearing after the C5 test and the impurity content of the original grease in the bearing is the inlet amount of the external medium in the bearing test626
JB/T 7752-- 1995
Appendix D
(Suggestive Appendix)
Grease filling amount of sealed ball bearings
Grease filling amount of non-contact sealed ball bearings shall be based on Table D1. D1 | | tt | Z | 6
0.36-~0. 9
0.56~-1.4
0. 68~1.7
0. 96~2. 4
1.64~-4.1
2. 4~~6. 0
3. 6~9. 0
3. 969.9
Bearing code
6200-2RZ
6201-2RZ
6202-2RZ
6203-2RZ
6204-2RZ|| tt||6205-2R2
6206-2R2
G207-2RZ
62082R2
6209-2RZ
6211-2RZ
6212 -2RZ
6213-2RZ
grease-filling cover
0. 24-0. 6
0. 32~-0. 8
0. 4~1. 0
0. 88-~2. 2
1.04-2. 6
1. 64~~4.1
2. 44~~6 . 1
4.4～~11.0
5.8～14.6
7. 4~-18. 4
8.4-~20.6
Bearing code|| tt||6801-2Rz
6301 2RZ
6312-2R2
6303-2R2
6301-2R2
6305-2RZ
6306-2RZ
6307-2R2| |tt||6308·2RZ
63092RZ
63102RZ
6311-2RZ
The grease filling amount of contact sealed ball bearing is the same as that of non-contact sealed ball bearing with the same code The fat filling is the same. The fat filling amount is
3.5 -1.3
2.1 ~..!
2. 06.~7.
t. t).1..
5. ~ E3.8
7.6.--15,0
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