针对曲柄转臂轴承传动部件多和受力具有时变性，致使受力精确计算困难，文中提出一种基于多体动力学的受力计算方法，并利用该方法研究输入转速和负载对转臂轴承受力的影响规律。计算结果表明: 转臂轴承受力随曲柄转角呈周期性变化，转速对转臂轴承的受力极值无影响，但影响其疲劳寿命; 转臂轴承受力随负载的增加而增大;将几何分析法与所提算法对比，结果显示两者具有很好的一致性。基于该计算结果，进一步采用有限元法分析不同工作载荷对转臂轴承接触应力的影响规律，结果表明转臂轴承存在单边受力现象，且各滚针接触应力各异。相关研究结论为转臂轴承的工程应用与优化分析提供了理论基础。

A multi-body dynamic force calculation method was proposed to deal with the difficulty of accurate force calculation due to the complicated and time-varying characteristics of crank arm bearing force． This method was fur-ther employed to analyze the influence patterns of input speed and load condition on the force of the rotating arm bearing． The results indicate that the force of the arm bearing changes cyclically with the crank angle，and the rota-tion speed has no influence on the extreme value of the arm bearing force but has effects on its fatigue life． The force of the rotating arm bearing increases as the load increases． In addition，the comparision between the result of geometric analysis and that of the proposed algorithm suggests a good consistency between the two． Based on these results，the finite element method was further used to analyze the influence of different working loads on the contact stress of the rotating arm bearings． The results show that there is a single-sided force phenomenon in the arm bea-ring，and the contact stress of each needle is different from each other． These findings provide a theoretical basis for engineering application and optimization analysis of rotating arm bearings．