陶瓷球轴承的热弹流润滑分析

建立陶瓷球轴承热弹流润滑的数学模型,利用多重网格法和逐列扫描法,得到陶瓷球轴承的点接触热弹性流体动力润滑完全数值解,并与普通轴承计算结果进行比较。结果表明:转速与载荷会对陶瓷轴承的接触区的压力、膜厚、温度产生影响,其中随着转速的增加,最小膜厚增加,摩擦因数减小,滚动体表面温度下降,而随着载荷的增加,最小膜厚减小,摩擦因数增大,滚动体表面温度上升;在相同的工况参数下,陶瓷球轴承的油膜压力低于普通轴承,膜厚高于普通轴承,轴承内圈、滚动体、中层油膜的温升小于钢质轴承,因而陶瓷轴承的润滑性能更好,使用寿命更长。

Analysis of Thermal Elastohydrodynamic Lubrication for Ceramic Ball Bearing

The mathematical model of the elastohydrodynamic lubrication(TEHL)for ceramic ball bearing was established,a full numerical solution was carried out with a multi-grid method and a sequential column sweeping technique,and the calculated result of it were compared with that of normal bearing.Results show that the oil pressure,film thickness and temperature in the contact area are influenced by the load and rotational speed.With the increase of rotational speed,the minimum film thickness increases,the friction coefficient reduces,the temperature of the rolling elements declines,and with the increase of load,the minimum film thickness reduces,the friction coefficient increases,the temperature of the rolling elements rises.Under the same working condition,the oil pressure of the ceramic ball bearing is lower than that of the normal bearing,but the film thickness is thicker.The temperatures difference of the inter ring,rolling elements and the middle layer of film for the ceramic ball bearing are all lower than those of the normal bearing.So,comparing with the normal bearing,the lubricating performance of the ceramic ball bearing is better,and the service life is longer.