深沟球轴承内部载荷序列与寿命计算

发布时间：2019-01-23 13:56

【摘要】：以深沟球轴承为研究对象,建立钢球与内外滚道的滚动接触模型,在疲劳寿命的计算中考虑轴承的运动特性。考虑球轴承中同时承载的滚动体个数随时间变化,提出了一种更为准确的载荷分布计算模型。分析了相同外部载荷作用下,不同游隙、不同转速对轴承内部载荷的影响。针对4种不同运动状态下的深沟球轴承,分析内圈、外圈和滚动体上一点的接触应力随时间的变化规律,计算得到其载荷序列。考虑内外圈不同运动状态对轴承应力循环次数的影响,对Lundberg-Palmgren(L-P)寿命模型进行了修正,计算了轴承内圈、外圈、滚动体以及轴承整体的寿命。对比不同运动状态下两种模型计算的寿命,在仅有一个套圈旋转时,修正的寿命与初始L-P寿命较为一致,当两个套圈同时旋转时,修正的L-P寿命与常用的L-P寿命计算结果存在较大差异。
[Abstract]:The rolling contact model between steel ball and internal and external raceway was established with deep groove ball bearing as the research object. The motion characteristics of bearing were taken into account in the calculation of fatigue life. A more accurate calculation model of load distribution is proposed considering the change of the number of rolling bodies loaded simultaneously with time in ball bearings. The influence of different clearance and speed on bearing internal load under the same external load is analyzed. For four kinds of deep groove ball bearings in different motion states, the law of the contact stress on the inner ring, the outer ring and the rolling body with time is analyzed, and the load sequence is calculated. The Lundberg-Palmgren (L-P) life model is modified to calculate the life of bearing inner ring outer ring rolling body and bearing as a whole considering the influence of different movement states of inner ring and outer ring on the stress cycle times of bearing. By comparing the calculated lifetime of the two models in different motion states, when there is only one ring rotating, the modified life is in good agreement with the initial L-P life, when the two rings rotate at the same time, There is a great difference between the modified L-P life and the commonly used L-P life.
【作者单位】：浙江大学机械工程学院;
【基金】：国家自然科学基金(51375436) 国家高技术研究发展计划(863计划,2015AA043002) 浙江省重大科技专项(2016C01G5130970)资助项目
【分类号】：TH133.33

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