面向乏油工况的高速轴承润滑增效研究

Research on Lubrication Efficiency Enhancement of High-speed Bearing under Oil-starvation Conditions

高速工况下轴承内部流动阻力增大、接触区供油效率降低导致轴承处于乏油润滑状态,严重影响轴承的服役性能。为提升高速下轴承内部润滑介质流动能力,改善轴承的润滑状态,本文提出一种面向滚动轴承喷射润滑的增效方法。通过在轴承内圈表面设计轴向沟槽结构,提升润滑介质的轴向流动能力,进而提高高速工况下轴承滚道及接触区域的润滑油量。通过建立沟槽化内圈表面润滑油流动模型,探索了沟槽结构流动引流及减阻机理,揭示了用于流动减阻的沟槽内底层润滑油带的形成规律并进行了沟槽结构优化设计。H7006C角接触球轴承润滑性能试验表明,在不同转速的乏油工况下,沟槽化轴承的温升均显著小于常规轴承,证实了本文润滑增效方法的有效性。

Under high-speed working conditions, the oil supply efficiency is reduced by the increasing internal flow resistance in the bearing, and the bearing is oil-starvation lubricated, which seriously affects the performance of the bearing. In order to improve the oil transportation capacity and lubrication performance of bearings, a lubrication enhancement method for jet lubrication of rolling bearings is proposed. By adding the axial groove structure on the bearing inner ring surface, the axial flow capacity of the lubricating oil is improved, thereby increasing the oil accumulation in the bearing contact area under high-speed conditions. The lubricating oil flow model on the grooved inner ring surface is established, the flow resistance reduction mechanism of the groove structure is explored, and the groove structure is optimized. The grooves are added to the H7006C angular contact ball bearing and the lubrication performance experiments are carried out. The results show that the temperature rise of the grooved bearing is significantly lower than that of conventional bearing under the oil-starvation conditions with different speeds, which confirms the effectiveness of the lubrication efficiency enhancement method.