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我国铁路技术政策确定各繁忙干线客运速度为140km／h。采用柔性车轮技术，将东风4型机车速度提高到140km／h来满足干线客运的要求，可能是最经济可行、上马最快的办法之一。为此，介绍了柔性车轮的结构、功效及国外的应用经验。并针对东风。型机车上应用柔性车轮作了电算分析，认为将东风4型机车速度提高到140～160km／h是完全可能的。
China’s railway technology policy to determine the busy trunk passenger speed of 140km / h. The use of flexible wheel technology, the Dongfeng 4 locomotive speed increased to 140km / h to meet the requirements of trunk passenger transport may be the most economical and feasible one of the fastest way. To this end, introduced the structure of the flexible wheel, the effectiveness and application experience abroad. And for the east. It is totally possible to increase the speed of Dongfeng 4 locomotive to 140 ~ 160km / h by applying the flexible wheels on the locomotive.