滚子副润滑状态转变的光干涉试验研究

摘要

利用光干涉测量技术,测量了滚子-盘有限长线接触副的润滑油膜形状和厚度,研究了滚子副的润滑状态随载荷、速度转变的规律.结果表明,接触区卷吸速度增加或载荷减小,使得滚子-盘接触副润滑状态逐渐由弹流润滑转变为流体动力润滑,且在两种润滑状态转变过程中存在过渡状态;由载荷变化引起流体动力润滑状态转变为弹流润滑状态过程中,接触区表面发生了弹性变形,使得接触区的油膜厚度增加.速度变化使滚子-盘接触处于流体动力润滑状态时,油膜出口颈缩消失,最小膜厚位置由出口颈缩处移至接触区中心,油膜光干涉图关于滚子轴线对称.%With the optical interference technique, the shape and oil film thickness of roller-disk finite line contact pairs is measured. Variation in the lubricating status versus the load and velocity was investigated. Results show that, as the entrainment velocity increases or the load decreases, the lubricating status of the roller-disk contacting pairs changes from elastohydrodynamic lubricating to hydrodynamic lubrication, and a transition state exists between the two lubricating status. During the transformation from elastohydrodynamic lubrication into hydrodynamic lubrication, elastic deformation of the contact surface is generated so that the film thickness of the contact region increases.When the roller-disk contact pairs is in the hydrodynamic lubrication status caused by the velocity variation, the film exit constriction disappears. In addition, the position of the minimum film thickness moves from the exit constriction to the contact centre, and the oil film interference pattern is symmetrical with respect to the roller's axis.