环形腔多油垫静压推力轴承膜厚高速重载特性

High Speed and Heavy Load Characteristic on Oil

关键词:  静压推力轴承  环形腔多油垫  油膜厚度  高速重载特性  实验研究

Key words:  Hydrostatic thrust bearing  Annular recess multi-pad  Oil film thickness  High speed and heavy load characteristic  Experimental research

摘要:

为了研究高速重载对静压推力轴承油膜厚度的影响，采用理论分析和实验验证相结合的方法，依据润滑理论和摩擦学原理推导出环形腔多油垫静压推力轴承旋转工作台转速、载荷与间隙油膜厚度的关系，设计了油膜厚度测试装置，并进行了实验验证。研究结果表明:随着旋转工作台转速升高和承载增大，惯性流量、剪切和挤压热增大，润滑油粘度下降，致使油膜厚度变薄，局部出现油膜破裂和干摩擦，导致静压支承摩擦失效。

Abstract:

In order to study the effects of high speed and heavy load on oil film thickness of hydrostatic thrust bearing，the method of combining theoretical analysis and experimental verification was adopted. The relation among oil film thickness，rational speed and load of the worktable in annular multi-pad hydrostatic thrust bearing was deduced by using lubricating theory and tribology principles. A test rig was designed for testing the oil film thickness of the above bearing，and a proven experiment was carried out. The calculated results qualitatively agree well with the experimental data. It has been found that by increasing the rotational speed and load the inertia lubricant flow rate，the heat of shear and extrusion increase，and lubricating oil viscosity declines sharply. The oil film thickness gets thin quickly and boundary lubrication or dry friction appears in local bearing friction pair together with bearing friction pair uneven deformation，and then tribology failure happens.