Analysis of Thermal Mixed Lubrication Performance in Hybrid Ceramic Ball Bearings

doi:10.3901/JME.2024.15.205

Abstract

Abstract: The bearing industry uses ceramics in extreme conditions such as aviation and machine tool spindles. To investigate the mixed lubrication performance of hybrid ceramic ball bearings, on the basis of quasi static modeling and analysis, and on the average flow model, a thermal mixed lubrication model of hybrid ceramic angular contact ball bearings is established. Combining the film thickness ratio with asperity contact load ratio, the lubrication state of rolling element is determined, and effects of thermal effect, contact angle and ambient viscosity on lubrication performance is studied. The results show that the oil film thickness and average friction coefficient under thermal conditions are smaller than those under isothermal conditions. Compared with steel bearings, hybrid ceramic ball bearings have better contact conditions, which are suitable for high speed condition; When λ < 1 and L_a> 4.6%, the contact pair is in boundary lubrication state; When λ ≥ 1 and L_a ≤ 4.6%, the contact pair is in mixed lubrication state. A single rolling element-ring contact cannot fully reflect the lubrication performance of the bearing. It is necessary to conduct mixed lubrication analysis of multiple rolling elements based on quasi static to accurately judge the mixed lubrication performance of the bearing. There is a suitable contact angle, which makes the mixed lubrication performance of angular contact ball bearings the best. The higher the ambient viscosity of lubricating oil is, the smaller the average friction coefficient is, and the lubrication state transits from boundary lubrication to mixed lubrication. Compared with steel bearings, hybrid ceramic ball bearings can reduce friction coefficient, but increase asperity contact load.

Key words: mixed lubrication, quasi-statics, hybrid ceramic ball bearings, thermal effect

CLC Number:

TH117

ZHU Pengjuan, LIU Xiaoling, ZHOU Yalin, HE Wenzhuo, GUO Feng. Analysis of Thermal Mixed Lubrication Performance in Hybrid Ceramic Ball Bearings[J]. Journal of Mechanical Engineering, 2024, 60(15): 205-215.

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http://www.cjmenet.com.cn/EN/Y2024/V60/I15/205

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