中文摘要：

使用面接触光干涉油膜厚度测量系统对阶梯轴承两平行平面间油膜厚度进行测量，试验中以静止的阶梯滑块平面和旋转的光学透明圆盘平面构成面接触润滑副，且两润滑平面始终保持平行，在不同的载荷条件下，对油膜厚度．速度曲线进行相关测量并对气穴现象进行观察。结果表明：测得的油膜厚度．速度曲线分为两个区，低速下的第Ⅰ区油膜厚度对速度无明显依赖性，且厚度较薄；随速度增加油膜厚度发生阶跃性增长进入第Ⅱ区，此时油膜厚度与速度在对数坐标下呈线性关系。不同的粘度和载荷对应的两个区的转化速度不同。对这一问题进行理论分析：得出与试验结果相同的结论。第Ⅰ区的承载力主要由表面粗糙度产生的局部流体动压效应引起的，第Ⅱ区则主要由阶梯轴承的流体动压效应产生。

英文摘要：

Some experimental studies are described about the film thickness between two parallel surfaces in a step bearing by a custom-made test apparatus. In the experiments, the lubricated parallel contact consists of a step-slider and a transparent glass disc. The film thickness is measured under different entrainment speeds and loads. The phenomenon of cavitation is observed. The results show that the variation of film thickness versus speed is divided into two regimes. In regime I where the speed is low, the film thickness is very thin and independent of speed; While in regime II, as the speed increases the film thickness shows significant increase and the film thickness versus speed displays a linear relationship in a log-log scale. The critical velocity dominating the transition from regime I to II depends on the lubricants and the applied loads. Some theoretical analyses are made about this problem, Same results are gotten. In regime I the load carrying capacity is generated mainly by local hydrodynamic effect caused by surface roughness, while in regime II the load carrying is by the hydrodynamic effect of geometry of the step bearing.