微造型阀芯摩擦副的动压承载及润滑特性

Analyzing Hydrodynamic Bearing Capacity and Lubrication Characteristics of Micro-texture Valve Core Friction Pair

以水液压滑阀的阀芯摩擦副为研究对象,通过在阀芯表面设计微造型结构以改善其动压承载和润滑性能。采用基于N-S方程的CFD方法分析微造型阀芯摩擦副的流场,得到微造型阀芯表面的压力分布曲线、承载力曲线以及摩擦力曲线,研究阀芯叠合量大于2.5 mm时,叠合量的大小对微造型阀芯摩擦副动压承载及润滑性能的影响。研究结果表明:光滑阀芯的表面无动压润滑效果,而微造型阀芯的表面可产生油膜动压支撑;且随着阀芯叠合量的减小,微造型阀芯表面的承载力值呈上升趋势,从而使阀芯和阀套间摩擦副的接触摩擦力减小。

The paper studies the friction pair of water hydraulic slide valve core. In order to improve its hydrodynamic bearing capacity and lubrication characteristics, micro-textures are set up on its surface. The computational fluid dynamics method based on the Navier-Stokes equation is used to analyze the flow field of the micro-texture valve core friction pair. The core surface pressure distribution curves, pressure bearing and friction curves are obtained. The influence of valve core overlap length on the hydrodynamic bearing capacity and lubrication characteristics of the friction pair is analyzed under the condition that the overlap length is greater than 2.5 mm. The analysis results show that the smooth valve core does not produce hydrodynamic lubrication effect but that the micro-texture valve core surface produces oil film＇s dynamic pressure support. With the decrease of the core overlap length, the bearing capacity on the micro-texture core surface increases; thus the contact friction between the valve core and the sleeve decreases.