GB/T 35472.2-2017 in English
VALIDTest method for friction element of wet automatic transmission―Part 2:SZBL type friction test machine guidelines
- Issued on:2017-12-29
- Implemented on:2018-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
《GB/T 35472.2-2017湿式自动变速箱摩擦元件试验方法 第2部分：SZBL型摩擦试验机使用指南》由TC406（全国非金属矿产品及制品标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
National Standard of the People's Republic of China GB/T 35472.2—2017
This part is the second part of GB/T35472, which mainly stipulates the use guide of SZBL friction tester as standard test equipment, including test equipment, typical test conditions and parameters, pre-test preparation, etc.
1. Background of Standard Formulation
Wet automatic transmissions are widely used in the automotive industry, and their core performance depends on the quality and performance of friction components. In order to ensure the accuracy and consistency of test results, this standard clarifies the technical requirements and use specifications of SZBL friction tester.
2. Comparison of standard frameworks
| Part number | Content overview | Scope of application |
|---|---|---|
| Part 1 | Terms and definitions | Applicable to all GB/T35472 series standards |
| Part 2 | Guidelines for use of SZBL friction testing machine | Friction element test of inertia brake test equipment |
| Part 3 | Low speed power increase test method | Friction performance analysis under low speed conditions |
3. Professional term explanation and application cases
Dynamic engagement speed: refers to the dynamic engagement speed of the friction element during the test, ranging from 500 to 8000 r/min. For example, when testing a certain brand of gearbox friction plate, the dynamic engagement speed must be set to 3000 r/min to simulate the performance under actual driving conditions.
Friction coefficient: An important parameter for measuring the friction between friction elements, which is affected by temperature, pressure and speed. Figure 1 shows the trend of the friction coefficient under different cycle numbers, indicating that effective analysis can be carried out after the friction performance tends to be stable.
4. Implementation suggestions
- Pre-test preparation: Ensure that the test chamber and oil storage tank are clean, and flush and fill with specified test oil.
- Equipment calibration: Regularly check the measurement accuracy to ensure that the measurement errors of torque, pressure, speed and temperature are within the allowable range.
- Data recording and analysis: It is recommended to use professional software to collect and analyze the test data in real time, focusing on the changing trend of the friction coefficient.
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