局部受载滚轮滚针轴承承载性能仿真分析

根据所研究滚轮滚针轴承局部受载和支撑结构特点,建立考虑凸轮局部受载影响的轴承全柔性体有限元仿真模型,系统分析了轴承加载载荷、游隙和安装偏斜角对轴承的力学性能、刚度和寿命的影响,并通过数值和试验方法对仿真结果的正确性进行验证。结果表明:局部受载条件下,径向载荷和偏斜角对轴承接触性能和寿命产生较大影响,轴承游隙对轴承接触性能和寿命的影响较小;径向载荷和偏斜角的增加,使得轴承承载区域减小,原对称“驼峰”型滚针母线的接触压力分布逐渐向偏斜角方向过渡,造成“一高一低”的母线压力分布形貌,最大接触压力增加,使得轴承寿命快速下降,但在极限载荷和偏转角条件下,仍满足轴承设计寿命指标要求。 

Loading performances simulation analysis of roller needle bearing with partial loading

Based on the characteristics of partial loading and support modes, afinite element analysis model of roller needle bearing fully considering the flexible structure influence of the cam and pin was established. Then, the influences of bearing load, radial clearance and installation misalignment angle on the mechanical property, stiffness and life of the bearing were analyzed systematically, and the correctness of the simulation results was verified by numerical and experimental methods. Results show that the radial load and installation misalignment angle have great influence on the contact performance and service life of bearings under partial loading conditions, while the clearance of bearings has little effect on the contact performance and service life of bearings; the increase of radial load and installation misalignment angle makes the bearing area smaller, and the original symmetrical contact pressure distribution pattern “hump” of the needle generatrix is gradually shifting to the deflection angle, resulting in the pressure distribution pattern of “one high one low”; the maximum contact pressure increases, and the bearing life decreases rapidly. However, under the conditions of limit load and installation misalignment angle, the service life index still meets the bearing design requirements.