基于球轴承拟静力学模型，考虑润滑油流变特性、热源和结构尺寸随温度的时变特性，利用热网格法建立了高速球轴承瞬态热计算模型，通过求解热平衡方程得到轴承瞬态变化特性，研究了工况参数对轴承生热量、温度和热诱导载荷的影响规律，为高速球轴承润滑参数选取、结构优化、热失效机理和故障分析提供了理论依据。结果表明：内圈转速和轴向载荷的变化均对轴承的热平衡温度和热诱导载荷有显著影响；适当降低润滑油的粘度、增大空气的对流系数有利于减小轴承热诱导载荷；同时还可以看出本文预测结果和文献测试结果吻合较好。
Abstract
Based on the quasi static model of ball bearings, the variation of oil viscosity, heat source and bearing structure size with temperature are considered, and then a high-speed ball bearing thermal calculation model is established. The transient thermal characteristics of high-speed ball bearings are obtained by calculating thermal equilibrium equations. Then, effects of different parameters on the heat generation, temperature and thermally-induced load of ball bearings are studied, which may provide a theoretical basis for the selection of lubrication parameters, structure optimization, thermal failure mechanism and failure analysis of high-speed ball bearings. The results show: inner ring speed and axial load have obvious influence on the thermal equilibrium temperature and thermally–induced load; the thermally–induced load can be decreased by using lower viscosity oil and increasing the convection coefficient of air; the predicted theoretical results are also in good agreement with the experimental results.
关键词
高速球轴承 /
热网格法 /
瞬态热分析 /
热诱导载荷
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Key words
high-speed ball bearings /
thermal network method /
transient thermal analysis /
thermally-induced load
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参考文献
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