油浴润滑高速枢轴承摩擦系数变载荷测量方法

提出高速枢轴承摩擦系数变载荷测量方法并设计了试验装置，测量得到枢轴承在不同转速下的摩擦系数。各试验枢轴在相同转速下，摩擦系数测量值差别明显，这源于边界润滑的随机性和复杂性；但是各轴摩擦系数均随转速升高而降低，测量平均值在0.09~0.05之间，这表明随枢轴承转速升高，流体动压效应增强，薄膜润滑降低了轴尖与宝石接触概率。通过对轴承摩擦损耗的计算来分析测量方法的可靠性，并将该方法应用于螺旋槽油膜轴承，测得其摩擦系数在0.017~0.014之间。

Measuring Friction Coefficient of the High Speed Pivot Bearing in Oil-bath Lubrication by a Varying Load Method

A varying load method was presented to measure the friction coefficient of the high speed pivot bearing in oil-bath lubrication. The friction coefficient of the pivot bearing running at different speeds was measured on the test apparatus. The experimental results showed that the friction coefficients of the pivot bearing samples diverged greatly at the same test speed, which was due to the randomness and complexity of the boundary lubrication of the pivot-jewel bearing in oil-bath. However, all of the friction coefficients became smaller when the running speed increased for every pivot bearing sample,and average measured values were between 0.09 and 0.05. The decrease of the friction coefficient with the increasing speed indicated that the hydro-dynamic effect in the boundary lubrication became strong and the thin-film lubrication cut down the probability of surface contact between the pivot and the jewel. The reliability of the measurement method was analyzed by calculating the energy loss from bearing friction. The friction coefficients of a spiral groove oil film bearing used in the flywheel support system were between 0.017 ~ 0.014 by the same test method