变工况下高速轴承表面沟槽润滑增效设计

To solve the problem of insufficient oil supply for rolling bearings under the influence of high-speed and high-pressure air curtain, a bearing lubrication efficiency enhancement method based on surface groove structure was proposed. Firstly, the bearing lubrication simulation model considering the real structure of the bearing and the internal movement of the components was established. The guiding effect of the grooves was used to enhance the axial flow ability of the lubricating oil to improve the bearing lubrication efficiency. Secondly, the influence law of oil supply, speed, groove size, nozzle diameter and other factors on bearing lubrication performance was studied based on the service characteristics of bearings under variable working conditions. Combined with the orthogonal design, the multi-factor sensitivity ranking affecting groove lubrication efficiency was obtained. Based on the parameter normalization method, the optimal groove width prediction formula was established for variable working conditions. A high-speed bearing lubrica-lion test platform was built, and the lubricating efficiency enhancement effects of different width grooves were compared and analyzed under variable bearing working conditions. The results show that when the bearings rotate speed exceeds 6 000 r/min, the optimal grooves structure obtained by the proposed method can increase the lubricating oil flow in the bearing's contact area by more than 5 times, which significantly improves the bearing lubrication efficiency.