加速工况下圆柱滚子轴承运动特性

In order to analyze the kinetic characteristics of cylindrical roller bearing, a whole roller dynamic model was established considering accelerations, operating conditions, geometry and rheological characteristics of lubricant, and the kinetic characteristics in transient and time-varying condition were investigated. The results show that dynamic model with the consideration of viscoelasticity can improve the accuracy of the model. Accelerations have obvious effect on bearing skidding, especially for rollers in unloaded zone. The accelerations make the skidding of cage and roller serious. When the bearing is during acceleration, the roller speed increases in a stair-step shape with the increase of time, but the cage speed increases in a linear relationship. When roller rotates from the loaded zone to the unloaded zone, the roller speed decreases slightly, and the roller speed increases sharply when the roller rotates from the unloaded zone to the loaded zone. The roller-inner slip velocity v_ij is large than roller-outer race slip velocity v_oj, and the direction of slip velocity v_oj changes in the area of maximum roller load position due to the effect of acceleration. The relative slip velocity between the roller and inner race is high in the unloaded zone, and meanwhile, heavy load and small clearance can reduce the slip speed.