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扇形腔多油垫静压推力轴承润滑性能受速度的显著影响,设计不当会引起润滑油膜破裂和干摩擦,严重时导致静压支承摩擦失效。针对此问题,运用流体动力学和润滑理论对油腔压力、油腔流量、油膜厚度等参数的速度特性进行数值分析,得到了速度对扇形腔多油垫静压推力轴承润滑参数的影响规律,避免静压支承摩擦失效的发生。研究结果表明:随着旋转工作台转速升高,惯性带油和离心力作用而甩出的润滑油油量增大,流出油腔的油流量增多,引起油腔压力下降,致使油膜厚度变薄,出现油膜破裂和干摩擦,导致静压支承摩擦失效。该研究为静压推力轴承的设计、润滑和实验提供基础数据,实现对静压推力轴承润滑性能速度特性的预测,达到减少经济损失的目的。
Fan-shaped multi-oil pad hydrostatic thrust bearing lubrication performance by the significant impact of speed, improper design will cause lubricant film rupture and dry friction, severe hydrostatic friction caused by friction failure. In order to solve this problem, the velocity characteristics of oil pressure, oil flow and oil film thickness were numerically analyzed by using hydrodynamics and lubrication theory. The influence of velocity on lubrication parameters of hydrostatic thrust bearing with multiple oil pads was obtained. Avoid hydrostatic bearing friction failure. The results show that with the increase of rotating speed of rotary table, the amount of lubricating oil thrown out by inertia with oil and centrifugal force increases, the oil flow out of the oil chamber increases, causing the oil chamber pressure to drop, Oil film rupture and dry friction, resulting in static pressure bearing friction failure. The research provides the basic data for the design, lubrication and experiment of hydrostatic thrust bearing to realize the prediction of the velocity characteristics of the hydrostatic thrust bearing lubrication performance and reduce the economic loss.