角接触球轴承内圈织构设计及对油气润滑两相流的影响

Texture Design of Inner Race and Its Effect on Two-Phase Flow in Angular Contact Ball Bearing with Oil-Air Lubrication

针对角接触球轴承油气润滑中内圈润滑油含量少和保持性差的问题,提出在轴承内圈滚道设计圆凹坑形表面织构的润滑增效方法。基于气液两相流模型和多重参考系方法,建立内圈织构化角接触球轴承腔内油气两相流数值分析模型,分析内圈织构对轴承油气两相流动及润滑增效的影响。结果表明:织构化轴承可以显著提高润滑油在内圈的保持量,同时改善轴承腔内润滑油分布不均的状况;在微织构附近油气两相流动更不规则,所产生的压力梯度和速度梯度有利于提高气液两相膜的承载力;随着轴承转速的升高,内圈织构润滑增效效果相对减弱;随着供油量的增加,内圈织构润滑增效效果更加显著。

Aimed at the problem of low lubricant oil and poor retention on the inner ring of angular contact ball bearings with oil-air lubrication,a lubrication efficiency enhancement method was proposed by designing circular dimple-shaped surface texture on bearing inner ring raceway.Based on the air-liquid two-phase flow model and the multiple reference frame method,the numerical model of oil-air two-phase flow inside textured angular contact ball bearing cavity was established,and the effect of inner ring texture on bearing oil-air two-phase flow was analyzed.The results show that the surface texture can significantly improve lubricant oil retention on the inner ring,while improving the distribution of lubricant oil inside bearing cavity.The oil-air two-phase flow is more irregular in the vicinity of the micro texture,and the resulting pressure and velocity gradients are conducive to improving the bearing capacity of oil film.With the increase of rotational speed,the lubrication efficiency enhancement of inner ring texture is relatively weakened,while with the increase of oil supply,the lubrication efficiency enhancement of inner ring texture is more significant.