Recently, CRH380B high-speed EMU gearbox developed by China Railway Group's Qishuyan has passed a 300,000-kilometer operation assessment, which indicates that China’s high-speed EMU gear drive has achieved a major breakthrough in independent R&D, adding to China’s high-speed rails. New weights.
The CRH380B Coupe is developed by the China Railway Group's Changchun Railway Vehicle Co., Ltd. and is mainly run on the Ha-Da high-speed passenger specialization. According to the latest 30-year meteorological record, the extreme minimum temperatures in the three northeastern provinces in China reached minus 40°C during the whole year. The temperature difference of 80°C is the coldest and most temperature difference area in China.
Low temperature is a severe test for high-speed iron gearboxes. It may even lead to serious shaft temperature rises, bearing failures, and other serious consequences, causing hidden safety risks. Prior to this, the gearbox technology of high-speed EMUs had been monopolized by German companies. In order to cope with the harsh operating environment, Qi Shuyan specifically designed and simulated the gearbox of the high-speed EMU, and adopted gears and box materials that are more resistant to low-temperature performance to ensure the reliability of the bearing in low temperature conditions. After a nine-month line operation assessment, experts from the China Railway Inspection and Certification Center, the Institute of Iron and Steel Technology, the Shenyang Railway Bureau, and the Changchun Railway Vehicle Co., Ltd. team have consistently determined that the domestic cold gearbox is in good condition. To meet the line operation requirements.
It is reported that Qishuyan is the only supplier of high-speed rail gear transmission in China. As of now, Qi Shuyan has covered the high-cold and non-high-cold areas of high-speed EMUs and has independent high-speed EMU gearboxes with various speed grades of 160-380km/h. The system, as well as the design and production innovation platform, established a complete test verification system and has produced more than 14,000 high-speed rail gearboxes. (Xu Wen)
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