车辆减振器油液微小内泄漏分析

针对车辆减振器油液内泄漏问题,对其内部油液微小内泄漏开展仿真与试验分析。通过数学模型对活塞与缸筒环形缝隙中流体进行理论受力分析,运用Autodesk Inventor软件建立减振器内部环形间隙流体几何模型,利用CFD仿真技术对环形间隙流体三维模型开展仿真分析,通过改变流场速度、压力、湍流动能及温度参数,分析得到影响减振器油液微小内泄漏的主要影响因素;采用伺服示功机对不同活塞速度和环形间隙下的油液内泄漏进行试验测试。结果表明:活塞静止时,节流口速度、压力、湍流动能的变化对环形间隙油液内泄漏影响较大,温度变化影响较小;活塞运动时,泄漏量随活塞速度、活塞与缸筒之间的间隙的增大而增大,因此在加工精度允许条件下,可通过减少活塞与缸筒间的间隙来减小泄漏量。

Analysis of Oil Internal Leakage in Vehicle Shock Absorber

Aimed at the problem of oil leakage in vehicle shock absorber,the tiny oil leakage of the shock absorber was studied by simulation and experiment.The theoretical force analysis of the micro internal leakage between the piston and the cylinder was carried out by mathematical model.The Autodesk Inventor software was used to establish the internal annular gap fluid geometry model of the damper,and the CFD simulation technology was used to simulate the three dimensional model of the annular gap fluid.Through the changes of flow field velocity,pressure,turbulent flow energy and temperature parameters,the main influencing factors affecting the tiny internal leakage of the damper oil were analyzed.The oil leakage test at different piston speed and annular clearance was performed on a servo dynamometer.The test results show that when the piston is stationary,the change of throttle velocity, pressure and turbulent flow energy has a great influence on the oil leakage of the annular gap,and the influence of temperature change is small.When the piston moves,the leakage of the annular gap is increased with the increasing of the piston speed and the gap between the piston and the cylinder.Therefore, the leakage can be reduced by reducing the gap between the piston and the cylinder under the condition that the machining accuracy is allowed.