In view of the problem that the current bearing life evaluation is mainly based on the constant load condition, and the dynamic coupling effects of radial force, axial force and bending moment are less considered, leading to the great difference between the actual service life and the theoretical life of the bearing, this paper proposed a method of wheel-hub-bearing service life prediction under multi-axial wheel loading. Based on the data of six-dimensional force measured in the proving ground, the coupling frequency relation between multi-axis loads is determined by joint distribution counting to determine the times of damage load. Based on the deformation coordination relationship between the bearing roller and the raceway, and considering the influence of the angular misalignment of the roller, the calculation model of the instantaneous contact load of the tapered roller bearing is established. Combining the count result of joint distribution of multi-axial loads and the calculation model of contact loads, Newton-Raphson(N-R) iterative method was used to solve the bearing circumferential contact load sequence. Based on the modified L-P theory, the equivalent dynamic load of the bearing corresponding to the multi-axial load is obtained, and the validity of the results is verified by comparing with the simulation results of Romax. Combined with equivalent dynamic load of bearing, joint distribution count result and linear damage accumulation criterion, the life calculation of wheel-hub-bearing under multi-axial random road load in the proving ground was completed, and the accuracy of the results and rationality of the method were verified by bench test. Thus, it can provide reference for the design and selection of wheel-hub-bearing and life prediction.

鉴于目前的轴承寿命评估主要基于恒定载荷条件下的问题，而很少考虑径向力，轴向力和弯矩的动态耦合效应，从而导致实际使用寿命与轴承寿命之间存在很大差异。从轴承的理论寿命出发，提出了一种多轴车轮载荷下轮毂轴承使用寿命的预测方法。根据在试验场中测得的六维力数据，通过联合分布计数确定多轴载荷之间的耦合频率关系，确定损伤载荷的次数。基于轴承滚子与滚道之间的变形协调关系，并考虑滚子角度未对准的影响，建立了圆锥滚子轴承瞬时接触载荷的计算模型。结合多轴载荷联合分布的计数结果和接触载荷的计算模型，采用牛顿-拉夫森（NR）迭代法求解轴承周向载荷序列。基于改进的LP理论，获得了与多轴载荷相对应的轴承等效动载荷，并与Romax的仿真结果进行了比较，验证了结果的有效性。结合轴承的当量动载荷，节理分布计数结果和线性损伤累积准则，完成了试验场地多轴随机道路载荷下轮毂轴承的寿命计算，通过台架试验验证了方法的准确性和合理性。因此，可以为轮毂轴承的设计，选择和寿命预测提供参考。