Using maintenance to analyze the cause of air leakage of 25K passenger car air spring Liu Xingmin (Wuwei South Vehicle Depot Wuwei South Inspection Center, Wuwei 733009, Gansu) 1 Overview Lanxin Line speed up 3a, some vehicles used air spring leakage in winter.
Because there is no necessary testing equipment and quantitative application limits, it brings certain difficulties to the use of maintenance work, and also leaves hidden dangers for driving safety.
2 Reason analysis Air spring leakage occurs mostly at the upper cover of the air spring. The air spring rubber bladder is inspected and there is no damage or crack. Therefore, the air leakage is caused by the press-fit.
The thermal expansion and contraction of the rubber bladder causes air leakage due to partial seal failure. Such faults occur mostly in the winter, and the temperature difference in the northwestern region is relatively high, which is more likely to occur. Take the T53 train (Urumqi-Shanghai) as an example. The train did not find air leakage at Lanzhou Station (1:00), but when it came to Wuwei South for inspection (the two stations were separated by 300km and operated for 4h30min), it was found that there was air leakage, and the train arrived. At the Jialuoguan Station (6:30), the air leakage phenomenon disappeared or decreased after driving.
When the two ends of the vehicle are in the passenger section, the overflowing water splashes on the air spring and the cover plate, forming a hail in the winter, causing the air spring to shrink due to the low temperature, and the air leakage is large; The service life of the air spring is lowered, and the upper cover plate is prone to rust.
3 Suggestions and measures to improve the press-fit quality of the air spring, so that the air spring can meet the technical requirements during use.
The manufacturer shall follow up such faults and provide the operating department with a quantitative leakage standard, so that the operating department can set the application limit for the air leakage air spring during daily maintenance to ensure driving safety.
According to local conditions, the air spring is equipped with a simple and practical protective cover to prevent water and other media from contaminating the air spring, resulting in a decrease in the service life of the air spring. mouth
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