轴连轴承温度场分析

Temperature Field Analysis of Bearing with Shaft

在对热传递方式分析的基础上,建立轴连轴承热传递模型。针对轴连轴承组件的具体工况及结构特点,并结合轴连轴承热传递模型,用有限差分法的思想将轴连轴承系统离散为一组温度节点。在球轴承拟静力学和生热分析的基础上,计算轴连轴承各组件的摩擦生热,轴连轴承组件各单元间摩擦生成的热量可近似按一定比例分配给内、外套圈。建立各个节点的能量平衡方程组,采用Newton-Raphson法对其进行数值求解。对不同工作转速和载荷下的轴承温度分布进行试验研究。结果表明,轴承转速和轴向载荷对轴承温升及温度分布影响较大,径向载荷对轴承温升及温度分布影响最小,其最高温度点位于球和内圈接触点上,外圈各点的温度低于对应的内圈各点的温度,其测试结果与计算结果基本吻合,数学模型正确合理。

A model of heat transfer among bearing elements is established based on the heat transfer analysis.With the finite difference method,the bearing system is separated into a group of temperature nodes based on working conditions,structural features of the bearing with shaft and the model of heat transfer among bearing elements.The friction heating,which has been calculated based on quasi-static analysis and thermal analysis,has been distributed proportionally to inner and outer ring.For each temperature node,energy equilibrium equations have been established.The energy equilibrium equations can be solved by Newton-Raphson technique.Temperature distribution is tested at various inner ring velocities and working loads.The results show that the inner ring velocity and axial load can affect temperature rise and temperature distribution strongly,but the effect of radial load is not significant.The maximum value of the temperature is at the point between the ball and inner ring.The different temperatures of outer ring are below the corresponding temperatures of inner ring.The calculation results are close to experimental results.So the models established are correct.