| ZHOU Jiang-min,LIU Xiao-ling,LI Dong,LIU Feng-qi.Effect of Contact Surface Properties on Mixed Lubrication in Cylindrical Roller Bearings[J],48(12):174-181 |
| Effect of Contact Surface Properties on Mixed Lubrication in Cylindrical Roller Bearings |
| Received:April 02, 2019 Revised:December 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.12.020 |
| KeyWord:surface pattern surface hardness mixed lubrication non-Newtonian lubricant thermal effect elastic-plastic deformation |
| Author | Institution |
| ZHOU Jiang-min |
School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| LIU Xiao-ling |
School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| LI Dong |
School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| LIU Feng-qi |
School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao , China |
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| Abstract: |
| The work aims to improve the lubrication performance of cylindrical roller bearings and study the effects of surface pattern and hardness to elastic modulus ratio of roller and outer ring on the mixed lubrication of cylindrical roller bearings. Based on the average flow model, non-Newtonian, thermal effect and elastic-plastic deformation of rough peak, a finite line contact thermal mixed lubrication model for cylindrical roller bearings was established. Effects of the surface pattern and hardness to elastic modulus ratio on the film thickness, the film thickness ratio, the load ratio, the average friction coefficient and the maximum temperature were studied. With the increase of the surface pattern parameter, the oil film thickness decreased gradually; the contact pressure, the average friction coefficient and the load ratio increased gradually; the maximum temperature decreased at first and then increased; and the minimum film thickness increased firstly and then decreased. However, when the surface pattern parameter was less than 1/3, the effect on the minimum film thickness was slight. Effects of the complete plastic deformation, the elastic-plastic and the plastic deformation, and the complete elastic-plastic deformation caused by the surface hardness on lubrication state were different. When the hardness to elastic modulus ratio was between 0.01 and 0.03, the elastic-plastic and the plastic deformation of the rough peak occurred simultaneously. The film thickness, the minimum film thickness, the load ratio, the average friction coefficient, the contact pressure and the maximum temperature did not change with the surface hardness. When the hardness to elastic modulus ratio was less than 0.01, the rough peak produced complete plastic deformation, and when the hardness to elastic modulus ratio was greater than 0.03, the rough peak underwent complete elastic-plastic deformation. The load ratio, the average friction coefficient, the contact pressure and the maximum temperature of the two cases all increased with the increase of surface hardness to elastic modulus ratio. The influence of surface hardness and pattern parameters in different conditions was different. When the surface pattern parameter was less than 1/3, the influence of surface hardness was dominant; and when the surface texture parameter was greater than 1.0, the influence of surface pattern parameter was dominant. When the surface pattern parameter is equal to 1.0, the lubrication state is the best. When the hardness to elastic modulus ratio is between 0.01 and 0.03, the comprehensive lubrication performance is the best. Under different conditions, the influence of surface pattern parameters and surface hardness on lubrication is different. Therefore, in the mixed lubrication of cylindrical roller bearings, there are the best surface pattern parameter and surface hardness to elastic modulus ratio. |
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