循环冲击载荷作用下滚滑轴承滚子的润滑特性研究

为探究冲击载荷对滚滑轴承润滑性能的影响，设计一种轮子扁疤系统，以模拟轴承受到的循环冲击载荷，利用数值分析法对比研究冲击载荷作用下滚滑轴承的润滑特性及不同工况对滚滑轴承滚子润滑的影响。结果表明：滚滑轴承的滚子润滑受冲击载荷的影响小于滚动轴承；冲击载荷发生前，滚滑轴承滚子油膜有高于油膜中心压力的第二峰值压力，油膜出口区有明显缩颈现象，随冲击载荷的增大，第二峰值压力虽会逐渐减小，但不会消失；冲击载荷频率越大，最小油膜厚度越大，冲击载荷幅值越大，滚子油膜厚度越薄；滚子油膜厚度随润滑油黏度、转速的增加而增加。

Study on Lubrication Characteristics of Roller of Rolling-Sliding Bearings under Cyclic Impact Load

In order to study the effect of impact load on lubrication characteristics of rolling-sliding bearings,a wheel flat system was designed to simulate the cyclic impact load on bearing,the lubrication characteristics of rolling-sliding bearings under impact load and the influence of different working conditions on the lubrication of the roller of rolling-sliding bearings were studied by numerical analysis method.The results show that the influence of impact load on the roller lubrication of rolling-sliding bearings is less than that of rolling bearing.Before the action of impact load,there is a second peak pressure on the roller lubrication film of rolling-sliding bearings which is higher than the central pressure of the oil film,and there is obvious necking at the outlet of the oil film.With the increase of impact load,the second peak pressure will decrease gradually,but it will not disappear.The larger the impact load frequency,the larger the minimum oil film thickness.The bigger the impact load amplitude,the thinner the roller oil film thickness.The thickness of oil film will increase with the increase of lubricating oil viscosity and rotational speed.