GB/T 35472.7-2017 in English
VALIDTest method for friction element of wet automatic transmission―Part 7:Band friction test procedure
- 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 35472.7-2017湿式自动变速箱摩擦元件试验方法 第7部分：带式摩擦试验方法》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
Interpretation of the National Standard of the People's Republic of China GB/T 35472.7—2017
Background and Significance of the Standard
GB/T 35472 "Test Methods for Friction Elements of Wet Automatic Transmissions" is divided into seven parts, of which Part 7 specifically provides detailed regulations for belt friction test methods. This standard was jointly drafted by Hangzhou Zhenxing Friction Materials Co., Ltd. and other units and was released in 2017.
Comparative analysis of standard frameworks
| Chapter number | Overview | Scope of application |
|---|---|---|
| Part 1 | Terms and definitions | General terms applicable to the entire standard system |
| Part 2 | Guidelines for use of SZBL friction testing machine | Operation specifications specifically for the test equipment |
| Part 7 | Belt friction test method | Measurement and evaluation of the friction performance of belt friction elements in wet automatic transmissions |
Technical requirements and implementation recommendations
1. Test equipment
The test equipment is a SZBL friction tester, and its performance and accuracy should comply with the provisions of GB/T 35472.2. The inertia configuration range is 0.1 kg·m² ~ 0.7 kg·m².
2. Typical test conditions and parameters
The test parameters include: piston area (7,000 mm² ~ 14,000 mm²), dynamic engagement speed (1,000 r/min ~ 10,000 r/min), oil temperature control (80°C ~ 150°C, error ±3°C), etc.
3. Experimental procedures and precautions
- Before each test, the test chamber and oil storage tank must be cleaned and flushed with the specified test oil.
- The change in friction plate thickness should be measured and recorded before and after the test.
- The test cycle includes: oil temperature stabilization period, coasting period, pressurization period and cooling period.
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