四驱汽车分动器轴承力学特性分析与试验

Analysis and experiment on mechanical characteristic of 4WD automobile transfer case bearings

针对四驱汽车传动系统分动器轴承载荷难以确定的问题,文章提出并推导了轴承力学特性分析公式。以某款四驱汽车分动器为例,构建了分动器各传动轴的空间力学模型,在此基础上推导出齿轮、轴承等部件的力学矩阵方程,从而求解出齿轮、轴承的各方向力学载荷;以90N·m输入工况为例,建立轴承有限元分析模型,运用推导出的力学载荷公式对其进行有限元分析与压力测试试验数值对比,得出轴承的有限元分析与试验应力误差为5.23%,验证了该公式的正确性;同时进行了极限工况下的轴承应力分析,研究成果为轴承在该类部件的设计提供了一定的依据。

Based on the uncertain problem of transfer case bearing load of the four-wheel drive（4WD） automobile transmission system ,the bearing mechanical characteristic formula was put forward and deduced .Taking a 4WD automobile transfer case as an example ,the spatial mechanical model of each transfer transmission shaft was built .On this basis ,the mechanical matrix equation of gears ,bearings and other parts was derived ,and the each directional mechanical load of the gears and bearings was solved .Under the condition of input torque of 90 N ＆#183; m ,the finite element analysis model of transfer case was set up ,and the results of the simulation applying the mechanical load formula were compared with the results of pressure test .The results show that the stress error of each bearing between simu-lation and test is 5 .23% ,which verifies the reliability of the mechanical load formula .Finally ,the bearing stress analysis under limiting conditions was carried out .The research results can provide a basis for the design of the bearing on this kind of transfer case .