JB/T 8820-1998 This standard specifies the technical requirements, test conditions, test methods and test equipment for the wear performance test of motorcycle transmission chains. This standard applies to drive chains used on various motorcycles (including other walking machinery) manufactured in accordance with GB/T 14212-93. Transmission chains manufactured in accordance with other standards may refer to this standard for implementation. (Note: This standard refers to the relevant technical content of ANSI B29.1-86 "Precision roller chains, accessories and sprockets for transmission.") JB/T 8820-1998 Specification for wear performance test of motorcycle transmission chains JB/T8820-1998 Standard download decompression password: www.bzxz.net

JB/T8820—1998
This standard was proposed and assigned by the National Technical Committee for Standardization of Chain Drives. The responsible drafting unit of this standard is the Chain Drive Research Institute of Jilin University of Technology. The participating drafting units of this standard are: Chongqing Changjiang Chain Industry Company, Nanjing Limin (Group) Co., Ltd., Hangzhou Zhonghui Industrial Co., Ltd., Jiangshan Jiangnan Chain Co., Ltd., and Jilin Institute of Technology. The main drafters of this standard are: Li Xinxin, Xiang Budong, Qin Jianming, Chen Jianfu, Chai Qing, and Wen Xiaonan. This standard is published for the first time.
1 Scope
Machinery Industry Standard of the People's Republic of China
Motorcycle transmission chains-Testingrules of wear performance
Motorcycle transmission chains-Testingrules of wear performance
JB/T8820-1998
This standard specifies the technical requirements, test conditions, test methods and test equipment for the wear performance test of motorcycle transmission chains. This standard applies to drive transmission chains used on various motorcycles (including other walking machinery) manufactured in accordance with GB/T14212-93. Transmission chains manufactured in accordance with other standards may be implemented as a reference. 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 will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB/T1243·-1997 Precision roller chains and sprockets for short pitch transmission GB9785--88 Terms for chains and sprockets
GB/T14212:-93 Motorcycle chains
3 Terms
Chain terms shall comply with the provisions of GB9785-88.
4 Technical requirements
4.1 The wear performance test of motorcycle transmission chains shall comply with the provisions of Table 1. 4.2 If the chain plates, rollers, bushings, and pins are broken or crushed during the wear test, they shall be treated as unqualified. 4.3 The joints of the test chain shall be connected reliably. If the joints are broken during the test, the test shall be invalid. Approved by the State Bureau of Machinery Industry on September 30, 1998 76
Implemented on December 1, 1998 bzxz.net
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JB/T 8820
9--1998
Table] Requirements for the wear performance test of motorcycle transmission chain Small sprocket
Test power
Lubrication method
15 drops/min
Whole chain (100) links) Wear elongation
Initial wear test
1) It is allowed to measure the wear elongation of the test chain with a chain link number not shorter than that specified in Table 2, and convert it. 5 Test conditions
The wear performance test of motorcycle transmission chain should be carried out on a wear test bench. 5.2 The test chain drive should be arranged horizontally.
5.3 Test sprocket teeth: small sprocket = 19 teeth, large sprocket 2 = 57 teeth. 5.4 Test sprocket tooth shape should comply with GB/T1243, and the two sprockets should remain coplanar during the test. Normal wear test
5.5 Test chain section number: L, 100 sections. In special cases, the test chain section number is allowed to be shorter than 100 sections, and the insufficient part can be connected in series with chain segments of the same specification
5.6 During the test, the sag of the loose side of the chain should be 1%~~3% of the center distance of the chain drive. 5.7 Lubricating oil brand No. 20 machine oil is used for lubrication and cooling. The lubricating oil should be kept clean and free of pollution, and no abrasive particles should be present. 5.8 Test environment temperature: -5~70℃.
6 Test method
6.1 The length of the test chain should be measured before the test, and the measuring points should be marked. During the test, the measuring points shall be measured according to the test time specified in Table 1. The minimum number of measured links and the measured load shall comply with the provisions of Table 2. The measurement shall be carried out according to the method specified in GB/T14212.
6.2 The joints of the test chain shall be marked. 77
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7Test equipment
:1998
JB/T8820
Table 2 Minimum number of measured links and measured load
Minimum number of measured links
Measured load
Chain wear test benches are divided into closed test benches and open test benches. It is recommended to use a closed chain wear test bench. 7.2 The spindle speed error of the wear test bench shall be ±1% of the specified test speed. 7.3 The torque error of the wear test bench loader shall be ±1% of the specified torque. 7.4 During the test of the wear test bench, the spindle speed and test load shall remain stable and constant. The wear test bench speed meter and torque meter should be calibrated regularly to ensure the consistency between the actual speed and torque values ​​and the instrument display values. 7.5
7.6 The wear test bench should be installed in a dust-free and clean environment without external impact and vibration, with relatively stable indoor temperature.
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