本文通过理论分析建立了几种常用逻辑溢流阀卸荷回路的数学模型,并进行数值计算和试验研究,分析了溢流阀及其系统的基本参数对卸荷压力冲击的影响,计算中液压油粘度、阻尼孔特征系数和调压阀阀口流量系数均按变数计入其对瞬态过程的影响。同时,文章还对一些其它卸荷回路及其缓冲措施进行试验研究,提出解决系统卸荷压力冲击的具体方法。 In this paper, the mathematical models of several commonly used unloading circuits of logic relief valve are established through theoretical analysis. The numerical calculation and experimental research are carried out. The influence of the basic parameters of the relief valve and its system on unloading pressure shock is analyzed. Oil viscosity, damping orifice characteristic coefficient and pressure regulator valve port flow coefficient are calculated as variables into their impact on the transient process. At the same time, some other unloading loops and their cushioning measures are also studied and some specific methods to solve the unloading pressure shocks are put forward.