阀式蓄能器对换挡液压系统压力冲击的影响  

Influence of Valve Accumulator Parameters on Pressure Shock of Shifting Hydraulic System

作　　者：魏列江[1,2] 徐晓鑫 单乐[1,2] WEI Liejiang;XU Xiaoxin;SHAN Le(Energy and Power Engineering College,Lanzhou University of Technology,Lanzhou,Gansu 730050;Key Laboratory of Advanced Pumps,Valves and Fluid Control System of the Ministry of Education,Lanzhou University of Technology,Lanzhou,Gansu 730050)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]兰州理工大学特种泵阀及流控系统教育部重点实验室,甘肃兰州730050

出　　处：《液压与气动》2024年第7期33-43,共11页Chinese Hydraulics & Pneumatics

基　　金：国家重点研发计划(2022YFB3403003)。

摘　　要：依据某重型车辆换挡液压系统,创新设计了一种带有阻尼节流槽的阀式蓄能器,通过流场仿真,分析不同活塞位移下的压力云图,根据实际工况配置阻尼槽的节流面积。通过换挡液压系统动态仿真模型,分析阀式蓄能器不同结构参数对蓄能器运动部件动态性能的影响规律,并且获得结构参数对作动离合器液压缸压力变化的影响机理。研究表明:阀式蓄能器U+K形阀口表现出二级节流特征,能够实现节流面积由大到小的变化规律;阀式蓄能器相较结构参数相同的弹簧式蓄能器,可使液压缸入口压力冲击幅值降低41%;增加U形节流槽宽度,可降低离合器液压缸入口压力冲击幅值;增加U形节流槽长度,压力冲击幅值无明显变化;增加复位弹簧刚度,可降低液压缸入口压力冲击。Based on the shifting hydraulic system of a heavy-duty vehicle,a valve accumulator with damping throttling groove is innovatively designed.Through flow field simulation,the pressure cloud image under different piston displacements is analyzed,and the throttling area of damping groove is configured according to the actual working conditions.Through dynamic simulation model of shifting hydraulic system,the influence law of different structural parameters of valve accumulator on dynamic performance of moving parts of valve accumulator is analyzed,and the influence mechanism of structural parameters on pressure change of hydraulic cylinder of actuating clutch is obtained.The results show that the U+K-shaped valve port of the valve accumulator shows a two-stage throttling characteristic,and the throttling area can be changed from large to small.Compared with the spring accumulator with the same structural parameters,the valve accumulator can reduce the inlet pressure impact amplitude of the hydraulic cylinder by 41%.Increasing the width of U-shaped throttling slot can reduce the impact amplitude of pressure at the inlet of clutch hydraulic cylinder.When the length of U-shaped throttling slot is increased,the pressure impact amplitude has no obvious change.Increasing the stiffness of the return spring can reduce the pressure impact of the hydraulic cylinder inlet.

关 键 词：换挡液压系统 压力冲击 阀式蓄能器 阻尼节流槽 结构参数 

分 类 号：TH137[机械工程—机械制造及自动化]