计及轴颈倾斜的径向滑动轴承流体动力润滑分析

Hydrodynamic Lubrication Analysis of Misaligned Journal Bearing

分析了稳定状态下轴受载变形导致轴颈倾斜时 ,径向滑动轴承的流体动力润滑特性 ;推导了轴受载变形导致轴颈倾斜时的轴承油膜厚度表达式 ;计算了不同轴颈倾斜角、轴颈倾斜方位和轴承偏心率等情况下的轴承油膜压力、油膜反力 (承载量 )、端泄流量、轴颈摩擦系数和保持轴承稳定工作的力矩。结果表明 ,轴受载变形导致轴颈倾斜时 ,无论是轴承油膜压力分布和最大油膜压力、油膜厚度分布和最小油膜厚度 ,还是轴承承载量、端泄流量和保持轴承稳定工作的力矩等摩擦学性能 ,都有明显的变化。

Hydrodynamic lubrication characteristics of a journal bearing considering misalignment caused by shaft deformation were analyzed under static conditions. Film thickness expression of the misaligned journal bearing was inferred. The film pressure, load-carrying capacity, leakage flow-rate, friction coefficient and misalignment moment of a journal bearing were calculated for different values of misalignment degree and eccentricity ratio. The results show that there are obvious changes at either film pressure distribution, maximum film pressure, film thickness distribution and minimum film thickness, or load-carrying capacity, leakage flow-rate and misalignment moment when misalignment takes place. Therefore, it is necessary to consider misalignments caused by shaft deformation when analyzing lubrication of the journal bearing.