多工况滚子摩擦副弹流润滑实验装置的设计

Design of Experimental Rig of Finite Line Contact EHL under Multi-condition Experiments

为了更好地观测滚子摩擦副在不同卷吸速度下的弹流润滑现象,开展有限长线接触弹流润滑油膜成膜机制的实验研究,对原有的线接触光干涉实验装置进行改进,将原有的曲柄滑块机构设计成丝杠推杆,从而将旋转运动转变成直线运动。实验表明:改进后的实验装置可以有效地实现滚子卷吸运动速度大小和运动规律的变化,可以观测到非常清晰的油膜干涉图像,在滚子接触区域油膜呈现出较为明显的弹流特征,可为线接触弹流的理论研究提供可靠的实验数据。在改进后的实验装置上,对滚子在突然加速的工况下进行了实验研究,由于步进电机的特点,在突然加速的瞬间有极短的停顿,导致挤压效应较为明显,油膜被封在滚子的接触区域内形成凹陷,出现封油现象,当滚子卷吸速度增加时,油膜厚度也会随之增加。

In order to observe and investigate finite line contact elastohydrodynamic lubrication better under different conditions by experiments,a set of optical interference experimental rig was designed by improving original line contact light interference experiment device. By replacing the crank sliding block with screw putter,the designed experimental rig can turn the rotary motion into a linear motion. The experiments show that the roller can realize the change of the roller in moving speed and motion law,and the clear interference images of elastohydrodynamic lubrication film can be observed in the experiments,and obvious elastohydrodynamic lubrication characteristics can be presented within the roller contact area.When the roller is accelerated in suddenly,the squeeze effect appears more obviously,and the concave is formed within the roller contact area,film is sealed due to stepper motor has very short of pause in accelerating suddenly. The EHL film thickness will increase with the increasing of roller speed.