ISSN   1004-0595

CN  62-1224/O4

高级检索

牵引模式下球环点接触高速弹流润滑行为机理分析

Analysis for Mechanism of EHL Behavior at High Speeds in Ball-on-Ring Contacts in Tractive Rolling Mode

  • 摘要: 基于球环点接触高速膜厚测量系统采用PAO6基础润滑油进行了高速弹流润滑试验研究,采用玻璃环转动带动钢球旋转的牵引方式,模拟轴承外圈与钢球的润滑接触状态. 试验结果显示高速下试验测得的中心膜厚值严重偏离经典弹流理论的预测. 基于高速热弹流润滑模型分析了高速下膜厚降低并偏离经典弹流理论预测的原因,计算结果表明钢球与玻璃环之间的运动不是纯滚动,存在滑滚比,并通过测量钢球转速加以验证;进而结合数值计算结果中接触区温度的变化,探讨了高速弹流润滑膜厚行为机理,高速时较大滑滚比的存在使得卷吸速度远低于纯滚动理论值是膜厚下降的主要原因,由此而产生的热效应使得润滑油黏度下降,膜厚进一步减小.

     

    Abstract: Based on the developed oil film thickness measuring system for high-speed ball-on-ring contact, the EHL test was conducted with base oil PAO6 at high speed, where the steel ball was driven by the ring in nominally tractive rolling mode for simulating the contact between ball and outer ring in ball bearings. The experimental results show that the measured central film thickness under high speed greatly deviated from the classical EHL prediction. The thermoelastohydrodynamic lubrication model was utilized to explore the factors that resulted in the reduction of film thickness at high speeds. The calculation results show that the ball and ring were not in pure rolling mode, but in severe rolling with sliding state, which was verified by measuring the speed of steel ball. And then combined with the calculated results of temperature in the contact zone, the mechanism of elastohydrodynamic lubrication behavior at high speeds was concluded that the high slide-roll ratio resulted in the entrainment speed less than the theoretical value, which was the key reason for the decrease of film thickness at high speed; the thermal effect resulting from the high slide-roll ratio further induced the decrease of film thickness.

     

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