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增加列车重量和提高车辆编组速度是机车车辆在现代条件下运用的特征。某些干线上的列车总重已达1万吨,车辆在驼峰编组场的冲击速度经常突破技术规程所规定的0.14米/秒而达到0.28～0.33米/秒,甚至更高。因此,经常发现列车纵向力超过允许值,运用中导致车辆零部件和货物的损坏,甚至造成车辆底架的断裂。减小纵向作用力和增加缓冲器容量的主要途径是增加缓冲器的行程。由于受自动车钩尾部长度的限制。缓冲器拉伸和压缩时的最大总行程只有260毫米。如果采用活动中梁缓冲装置就大有可能增加缓冲器的行程。
Increasing train weight and increasing vehicle grouping speed are the characteristics of rolling stock used in modern conditions. The total train weight on some of the main lines has reached 10,000 tons, and the impact speed of the vehicles at hump marshalling yard often exceeds the 0.14 m / s prescribed in the technical regulations to reach 0.28 to 0.33 m / s or even higher. Therefore, it is often found that the longitudinal force of the train exceeds the allowable value, resulting in damage to parts and cargo of vehicles and even rupture of the chassis of the vehicle. The main way to reduce the longitudinal forces and increase the capacity of the bumpers is to increase the stroke of the bumpers. Due to the limit of the length of the tail of the automatic coupler. The maximum total stroke of the bumper when it is stretched and compressed is only 260 mm. It is quite possible to increase the stroke of the bumper if an active bumper is used.