JB/T 8167-1996 Technical requirements for automobile generator bearings JB/T8167-1996 Standard download decompression password: www.bzxz.net

JB/T 8167--96
This standard is formulated for the first time.
When formulating this standard, the technical conditions of the relevant automotive alternators were referred to. This standard was proposed and managed by the National Technical Committee for Standardization of Rolling Bearings. Drafting unit of this standard: Luoyang Bearing Research Institute of the Ministry of Machinery Industry Drafters of this standard: Zhang Xiangyin, Chen Jing, Song Li. 638
1 Scope
Standards of the Machinery Industry of the People's Republic of China
Automobile generator bearings
Technical conditions
This standard specifies the technical conditions of sealed deep groove ball bearings (hereinafter referred to as bearings) for automotive generators. This standard is applicable to the production inspection and user acceptance of generator bearings by manufacturers. 2 Referenced standards
JB/T8167---96
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 will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T272—93 Rolling bearing code method
GB274—91 Rolling bearing assembly chamfer limit GB/T307.1---94 Rolling bearing radial bearing tolerance GB307.2-84 Rolling bearing tolerance measurement method GB307.3—84 Rolling bearings - General technical requirements GB/T4604—93 Rolling bearing radial clearance GB7324--87 Universal lithium-based grease for rolling bearings GB8597-88 Rolling bearing packaging
JB1255-91 Technical conditions for heat treatment of high carbon chromium bearing steel rolling bearing parts JB/T6639--93 Technical conditions for skeleton rubber sealing rings for deep groove ball bearings JB/T7752--95 Technical conditions for sealed deep groove ball bearings 3 Technical requirements
3.1 The code method for bearings shall comply with the provisions of GB/T272. 3.2 The tolerance of the bearing shall comply with the provisions of Class 0 tolerance in GB/T307.1. 3.3 The general technical requirements of the bearing shall comply with the provisions of GB307.3 and JB/T7752. 3.4 The radial play of the bearing shall comply with the provisions of Group 3 clearance in GB/T4604. 3.5 The sealing ring for the bearing shall comply with the provisions of JB/T6639 and the product drawings. 3.6 The physical and chemical properties of the grease filled in the bearing shall comply with the provisions of GB7324, and shall have good anti-rust and lubricating properties within the range of -40 to +180°C. The amount of grease filled shall be 20% to 40% of the internal space volume of the bearing, and can also be filled according to the amount of grease agreed upon by the user and the manufacturer. 3.7 The technical requirements for heat treatment of the bearing shall comply with the provisions of JB1255 and the product drawings, and the bearing shall be able to work normally at 150°C. 4 Test method
4.1 Low temperature test of bearings
Put the bearing in a low temperature box, cool it from room temperature to 40℃±3℃ and keep it warm for 2 hours. Take out the bearing and it should rotate normally. 4.2 Bearing temperature change test
Put the bearing in a low temperature box and a high temperature box alternately to expose it to rapid temperature changes. During the test, put the bearing directly into the temperature Approved by the Ministry of Machinery Industry on September 3, 1996
Implemented on July 1, 1997
JB/T 8167 -96
has dropped to -40C ±3 (low temperature box, keep warm for 2 hours, take out, and place at room temperature for no less than 2min and no more than 3min. If a two-box test equipment is used, it can be less than 30$, and it is not necessary to place it at room temperature). Then put the bearing into a high temperature box that has risen to weak (王2 (), keep warm for 2 hours, take out and place it at room temperature. The above process constitutes a cycle, and the test time is 3 cycles. After the test is completed, the bearing returns to a stable temperature at room temperature. The grease should not be external Overflow, dimensional accuracy and rotation accuracy should comply with the requirements of the product drawings, and the bearing should rotate normally.
4.3 Bearing high test
Place the bearing vertically in a high temperature box, heat it from room temperature to 150 (±3°C), keep it warm for 4 hours, take out the bearing and cool it naturally to room temperature. The bearing should not change in shape and size, the grease should not overflow, and the bearing should rotate normally. 4.4 Overspeed test of generator bearings for cars
When testing on an indoor testing machine, the ambient temperature is 95°C±2°C, the speed is 150 00r/min, radial load is 8% of the bearing radial dynamic load rating, test time is 5h, continuous operation time is not less than 4h. After the test, the bearing should still rotate normally. 4.5 Bearing durability test
4.5.1 When the test is carried out on an indoor testing machine, the ambient temperature is room temperature, the speed is 3000r/min, the radial load is 8% of the bearing radial dynamic load rating, the continuous operation time is not less than 4h, and the bearing life is not less than 3000h. 4.5.2 The durability test of the bearing is also allowed to be carried out by In the corresponding AC generator, carry out the cycle test according to the conditions listed in Table 1. The continuous test time shall not be less than 4 hours and the bearing life shall not be less than 3000 hours. Table 1
Cycle
1st cycle
2nd cycle
3rd cycle
Note: mx
Output current/A
100%1k
25%nimax
Working speed and time
50%nmgxwwW.bzxz.Net
80 min
The maximum working speed of the AC generator is 12000r/min. 10%nmax
4.5.3 The durability test of the bearing is also allowed to be installed in the AC generator and then installed on the vehicle for testing. The bearing should be able to ensure that the vehicle can travel 120,000 km.
4.5.4 When the high-speed test of the generator bearing for passenger cars is carried out on the indoor testing machine, the ambient temperature is 93C:+2 (. The speed is 12500rmin, the radial load is 8% of the radial rated dynamic load of the bearing, the continuous operation time is not less than 4h, and the bearing life is not less than 250i5 Inspection method
5.1 The inspection method of the bearing shall comply with the provisions of J13/T7752 and this standard. 5.2 When inspecting and accepting the bearing, the general inspection level II is adopted, and the normal inspection sampling plan (the sample wood is not less than 10 sets and not more than 50 sets) is used. Six sets of them are first tested according to 4.1.4.2 and 4.3, and then the inspection of the remaining items is carried out. Two of them are tested according to 4.4. Another 4 sets are selected for durability test according to 4.5 (any of the four durability tests can be performed). For continuous batch production, except for the first batch, the remaining batches may not be subjected to durability test. 5.3 When an indicator fails to meet the inspection and acceptance criteria, double sampling should be conducted in the same batch of bearings, and the unqualified item should be re-inspected. The re-inspection result shall be the final judgment result. If it still fails to meet the criteria, the batch of bearings shall be judged as unqualified. 6 Marking and packaging
6.1 The marking of generator bearings shall comply with the provisions of the product drawings. 6.2 Generator bearings that have passed the inspection shall be rust-proofed in accordance with the provisions of GB8597. 640
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