一，绪言铁道车辆的检修作业是对车辆各部的功能装置和附属装置定期进行检查、维修，恢复所规定的功能，预防故障发生，为乘客提供更好的服务。在检修作业中，通常需将这些装置从车辆上拆卸下来进行修理，修好后的机械装置还要装回到车辆上去。拆装作业一般要在车架底下非常狭 I. INTRODUCTION Maintenance work on railway vehicles periodically checks, repairs and restores the functional devices and ancillary devices of various departments of the vehicle to prevent malfunctions and provide passengers with better services. In maintenance work, these devices are usually removed from the vehicle to be repaired, the repaired mechanical device is also loaded back to the vehicle. Disassembly operations are generally very narrow under the frame