内滚道缺陷对滚动轴承刚度特性的影响研究

Research on the effect of inner raceway defects on the stiffness characteristics of rolling bearings

滚动轴承广泛应用于矿用电机等大型设备,在工况复杂多变、运行条件恶劣的情况下,长期高负荷运转会导致滚动轴承产生疲劳点蚀,在滚道表面产生缺陷,缺陷的恶化会影响设备的正常工作。针对内滚道存在缺陷的滚动轴承,将缺陷引起的附加位移加到轴承的弹性形变中,根据力学平衡方程,分析各滚动体的载荷分布,并建立内滚道存在缺陷的滚动轴承刚度模型,分析缺陷长度和深度对滚动轴承刚度特性的影响规律。结果表明,缺陷位于非承载区时,缺陷轴承的平均刚度和无缺陷轴承的平均刚度相等;当缺陷随着内圈的转动由承载区向非承载区移动时,轴承的平均刚度先减小后增大,且平均刚度的大小与缺陷的长度和深度负相关。

Rolling bearings are widely used in mining motors and other large equipment.Under complex and changeable working conditions and harsh operating conditions,long-term and high load operation will lead to fatigue pitting corrosion of rolling bearings and defects on raceway surface,and the deterioration of defects will affect the normal operation of equipment.In this paper,for rolling bearings with defects in the inner raceway,the additional displacement caused by the defect is added to the elastic deformation of the bearing.According to the mechanical balance equation,the load distribution of each rolling element is analyzed,and the stiffness model of the rolling bearing with defects in the inner raceway is established.The influence of defect length and depth on rolling bearing stiffness characteristics is analyzed.The results show that when the defect is located in the non-loaded area,the average stiffness of the defective bearing is equal to the average stiffness of the non-defective bearing.When the defect moves from the loaded area to the non-loaded area with the rotation of the inner ring,the average stiffness of the bearing first decreases and then increase,and the average stiffness is negatively related to the length and depth of the defect.