考虑表面粗糙度的叶片密封面润滑及摩擦的数值研究

Numerical research on vane sealing surface lubrication and friction with surface roughness considered

为更准确地分析叶片式液压摆动油缸叶片密封面的润滑性能,利用弹性力学平面问题的基本理论建立叶片密封面接触压力数学模型并求得压力在接触面上的分布情况,然后基于瞬态平均Reynolds方程与G-W微凸体接触模型,建立叶片密封面流体动压润滑模型,分析叶片粗糙度对密封面接触压力、油膜厚度分布和摩擦力的影响。结果表明,叶片表面粗糙度增大时,密封面油膜厚度没有明显变化,但摩擦力明显增大。

For accurate analysis of the lubrication performance of vane sealing surface of the hydraulic rotary vane actuator, the mathematical model of contact pressure of vane sealing was established and pressure distribution on the contact surface obtained on the basis of fundamental theory of plane problem of elastic mechanics. Then, based on average transient Reynolds equation and G-W micro-protruding asperity contact model, the transient fluid hydrodynamic pressure lubrication model of vane sealing surface was set up. With surface roughness considered, pressure distribution on the contact surface, oil film distribution of the sealing surface, and friction force were obtained by computations. The results indicate that, as vane sealing surface roughness increases, there＇s no obvious change with oil film thickness of the sealing surface but friction force increases significantly.