水润滑轴承不对中偏角对其润滑性能的影响

Influence of Misalignment Angle on Lubrication Performance of Water-lubricated Bearings

为了探究不对中偏角对水润滑轴承润滑特性以及润滑状态的影响,建立了考虑不对中偏角影响的轴承润滑修正理论模型,研究了不同不对中偏角大小对水润滑轴承液膜厚度分布、压力与剪切力的分布以及润滑状态过渡的影响。研究结果表明,不对中偏角的存在将会对液膜厚度分布和所受压力和剪切力分布产生显著的影响,不对中偏角的增大会导致最小液膜厚度减小以及压力峰值与剪切力峰值增大,且峰值位置不断沿轴向向轴承一端边缘偏移,进而导致轴承产生严重的边缘效应;不对中偏角还会改变轴承的润滑状态,使得边界润滑区增大,混合润滑区和流体动压润滑区减小,从而使轴承从边界润滑过渡到混合润滑及流体动压润滑更加困难,导致润滑性能下降,更容易引发轴承异常磨损。研究结果能为水润滑轴承的设计和优化提供一定的理论指导。

In order to investigate the influence of misalignment angle on lubrication characteristics and lubrication state of water-lubricated bearings,a theoretical model of lubrication correction is established considering the influence of misalignment angle,and the influence of different misalignment angle on the distribution of liquid film thickness,pressure and shear force and lubrication state transition of water-lubricated bearings is studied. The research results show that the existence of the right angle in the will of liquid film thickness distribution and the pressure and shear force distribution have a significant impact,the increase of angle in the wrong leads to the minimum thickness of liquid film,increase with the decrease of peak and peak pressure and shear force and peak position continuously along the axial bearing end edge excursion,leading to the edge of the bearing have serious effect. The misalignment angle will also change the lubrication state of the bearing,making the boundary lubrication zone increase,the mixed lubrication zone and the fluid dynamic pressure lubrication zone decrease,thus making it more difficult for the bearing to transition from boundary lubrication to mixed lubrication and fluid dynamic pressure lubrication,resulting in the decline of lubrication performance,and more likely to cause abnormal wear and tear. The research results can provide some theoretical guidance for the design and optimization of water-lubricated bearings.