橡胶油封唇口温度及其对润滑失效影响  

Rubber Oil Seal Lip Temperature and Its Effect on Lubrication Failure

作　　者：赵良举[1] 赵向雷[1] 杜长春 彭钿忠 李云飞 吴庄俊[1] 

机构地区：[1]重庆大学动力工程学院,重庆400030 [2]重庆杜克高压密封件有限公司,重庆400039 [3]重庆市橡塑密封企业工程技术中心,重庆400039

出　　处：《机械科学与技术》2014年第6期840-844,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：重庆市自然科学基金项目(CSTC2007BB6184);中央高校基本科研业务费项目(CDJZR11140002)资助

摘　　要：通过理论分析得到与温度相关的油膜厚度表达式,同时建立油封工作的二维轴对称模型,考虑润滑油膜厚度与黏温效应,分析了旋转轴转速和油封周向载荷对油封唇口温度分布、最高温度和温升的影响,以及唇口温度对油封润滑失效的影响。结果表明:油封唇口附近温度梯度较大,油封与旋转轴之间产生的摩擦热主要通过旋转轴和润滑油散失;油封唇口最高温度和唇口温升随转速增加而增加,随周向载荷增加而增加;唇口温升增加导致润滑油黏度降低,使得油膜厚度减小,当油膜厚度小于临界膜厚时油封会出现润滑失效。This paper has derived the expression of oil film thickness related to temperature by theoretical analysis. The two-dimensional axisymmetric model of oil seal is also established. Considering the oil film thickness and thermoviscosity effect,the influence of shaft speed and circumferential load on the oil seal lip temperature distribution,maximum temperature and temperature-rise is analyzed. Furthermore,the influence of lip temperature on the oil seal lubrication failure is also studied. The results show that the temperature gradient is large near the oil seal lip,the frictional heat generated between oil seal and shaft is dissipated mainly by shaft and engine oil. The maximum temperature and temperature-elevation of the oil seal lip increase with the increasing of shaft speed and circumferential load. With the increase of oil seal lip temperature-elevation,the viscosity of engine oil and the oil film thickness decreases. Lubrication failure occurs in the oil seal as the oil film thickness is less than the critical value.

关 键 词：径向唇形密封 唇口温度 唇口最高温度 油膜厚度 润滑失效 

分 类 号：TB42[一般工业技术]