GB/T 38074-2019 in English
VALIDStandard test method for determining the friction and wear properties of manual transmission fluid using a high-frequency—Linear-oscillation (SRV) test machine
- Issued on:2019-10-18
- Implemented on:2020-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$165.00
《GB/T 38074-2019手动变速箱润滑油摩擦磨损性能的测定 SRV试验机法》由TC280（全国石油产品和润滑剂标准化技术委员会）归口，TC280SC1（全国石油产品和润滑剂标准化技术委员会石油燃料和润滑剂分会）执行，主管部门为国家标准化管理委员会。
Introduction
1. Standard Overview
This standard (GB/T 38074—2019) specifies the method for determining the friction and wear properties of manual transmission lubricants using a high-frequency linear vibration tester (SRV). This method quickly determines the lubrication properties of lubricants by simulating the friction behavior of synchronizer materials in automotive manual transmissions.
2. Background of Standard Formulation
With the development of the automotive industry, manual transmissions are increasingly being used. In order to ensure the reliability and durability of transmissions, it is necessary to accurately evaluate the friction and wear properties of lubricants. This standard is based on the CECL-66-99 test method and simulates synchronizer bench testing at $60~^\circ C$.
3. Technical Details
| Parameter Name | Setting Value | Description |
|---|---|---|
| Test Temperature | $60~^\circ C$ | Simulates actual gearbox operating environment. |
| Test Load | $260~N$ | Ensures a realistic reflection of friction behavior. |
| Vibration Frequency | 50 Hz | Simulates dynamic friction under actual operating conditions. |
4. Test Method and Steps
Testing Process:
- Specimen Preparation: The notched steel ring of the upper specimen and the copper disk of the lower specimen need to be ultrasonically cleaned to ensure the surface is clean.
- Lubricant Addition: Use a syringe to evenly cover the surface of the copper disk of the lower specimen with 0.4 mL of the sample.
- Testing Machine Settings: Set the temperature, load, frequency and stroke parameters, and start the automatic loading program.
- Data Analysis: Record the friction coefficient values at 15 min, 30 min, 90 min and 120 min, and calculate the wear volume (if necessary).
5. Implementation Suggestions
Application Case:
A lubricant manufacturer used this standard to test its new product and found that the friction coefficient was stable at $0.12 \pm 0.01$ after 120 minutes. The wear volume measured by the surface topography instrument was $0.5~\mu m^3$, which meets the requirements of industry standards.
Improvement Suggestions:
It is recommended that companies calibrate the equipment before testing and update the test pieces regularly to ensure data accuracy. At the same time, adjust the test parameters based on actual working conditions and optimize the lubricant formula.
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