基于修正L-P模型的轮毂轴承载荷分布与弯曲疲劳寿命分析

Load Distribution and Bending Fatigue Life Analysis of Hub Bearings Based on Modified L-P Model

以第三代轮毂轴承为研究对象,推导了弯矩作用下滚动体与内滚道、外滚道的接触变形与接触载荷,提出了更为准确的接触载荷分布计算模型,分析了不同工况下轮毂轴承内部接触载荷和接触角的周向分布规律。在轮毂轴承内部载荷分布的一次修正基础上,考虑不同位置角的滚道材料和滚动体的接触疲劳,利用乘积定律进行统计处理,得到了第三代轮毂轴承疲劳寿命的修正L-P模型。结合ISO281—2007寿命修正计算方法,针对润滑现象进行二次修正,得到了经过润滑修正的第三代轮毂轴承疲劳寿命模型。利用旋转弯曲疲劳试验机进行了轴承的弯曲疲劳试验,试验结果显示,该疲劳寿命模型计算得到的理论值与试验值的误差在10%以内,验证了模型的正确性。

The third generation hub bearings were taken as the object of study to deduce the contact deformations and contact loads among rolling body,inside and outside raceways under the actions of bending moment.A more accurate calculation model of contact load distribution was proposed.The circumferential distribution laws of contact load and contact angle of hub bearings under different working conditions were analyzed.Based on the first modification of load distribution in hub bearings,the contact fatigue of raceway materials and bearing rollers with different position angles was considered,and the modified L-P model of fatigue life of third generation hub bearings was obtained by using the product laws statistical interpretation.Meanwhile,combined with the ISO281—2007 life correction calculation method,second modification of the lubrication phenomenon were conducted,and the fatigue life model of the third generation wheel hub bearings was obtained,where the lubrication was modified.The bending fatigue tests of the bearings were carried out by rotating bending fatigue testing machine.The tests results show that the errors between the theoretical and testing values calculated by the proposed fatigue life model are less than 10%,and the correctness of the model is verified.