| SONG Qi,WANG Youqiang,ZHU Junjie,MA Jinyue,XU Ying,LOU Yuanhao.Influence of Solid Liquid Two Phase Fluid Properties on Lubrication and Load Carrying Characteristics of Needle Roller Bearings[J],53(15):77-87, 108 |
| Influence of Solid Liquid Two Phase Fluid Properties on Lubrication and Load Carrying Characteristics of Needle Roller Bearings |
| Received:August 19, 2023 Revised:October 31, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.15.007 |
| KeyWord:needle roller bearing two-phase fluid particle loading elasto-plastic deformation contact friction surface pitting |
| Author | Institution |
| SONG Qi |
School of Mechanical and Automotive Engineering, Shandong Qingdao , China |
| WANG Youqiang |
School of Mechanical and Automotive Engineering, Shandong Qingdao , China ;Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Ministry of Education, Qingdao University of Technology, Shandong Qingdao , China |
| ZHU Junjie |
School of Mechanical and Automotive Engineering, Shandong Qingdao , China |
| MA Jinyue |
School of Mechanical and Automotive Engineering, Shandong Qingdao , China |
| XU Ying |
School of Mechanical and Automotive Engineering, Shandong Qingdao , China |
| LOU Yuanhao |
School of Mechanical and Automotive Engineering, Shandong Qingdao , China |
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| Abstract: |
| The rolling pair inevitably produces abrasive particles mixed with lubricating oil due to friction and wear during the working process, and can also cause dust and sediment impurities in the working environment, and thus pollute the lubricant due to sealing reasons. Needle roller bearings are mostly designed as an open structure type, which greatly increases the possibility of pollutants entering the lubricating oil. When solid particle components are mixed into the lubricant, a solid-liquid two-phase fluid is formed, and the lubrication performance is correspondingly changed compared with oil lubrication. Considering the influence of centrifugal force during the operation of needle roller bearings, a special case of infinite linear contact between the bearing needle and the raceway of the bearing was studied. Firstly, the lubrication medium was regarded as a solid-liquid two-phase, and mathematical models of particle compression deformation and needle bearing lubrication were established. Based on the assumption of deformation continuity, the model conducted a contact mechanics analysis for individual particles. The contact equation of elastic-plastic deformation was fitted using the template function, and the bearing capacity of single particle at different deformation stages was solved. And through the calculation method of lubricating medium mass concentration, the aggregate amount of particles could be calculated to gain the aggregate bearing capacity of particles in the lubricating medium. Secondly, lubrication numerical calculation was carried out. The Reynolds equation, oil film thickness equation and energy equation were calculated by the multiple grid method and other methods to gain the lubrication parameters of the bearing system. The system's force was calculated through dynamic equations to maintain stable calculation results. Finally, the influences of different particle sizes, mass fractions, and densities on particle loading capacity and oil film lubrication characteristics were studied. When the oil contained particles, the particles would bear part of the external load, but the bearing capacity was less than the load borne by the oil film. Under the same variable speed condition, the larger the particle size, the larger the size deformation, the larger the particle bearing capacity, the lower the oil film bearing capacity, and the larger the oil film thickness. The load borne by 0.5 mm particles was 119.2% higher than that of 0.3 mm particles. However, both the decrease of particle density and the increase of mass concentration would increase the number of particles in the two-phase flow and increase the carrying capacity of particles in the two-phase flow. The carrying capacity of 10% mass concentration particles increased by 251.8% compared with 2% mass concentration particles. The carrying capacity of 3´103 kg/m3 density particles was 86.9% higher than that of 7´103 kg/m3 density particles. The bearing particles would produce contact friction due to the deformation of the contact surface, and the contact friction would be much greater than the friction generated by oil lubrication, and the negative effect of this friction on the system was much greater than the positive effect of the bearing particles. The presence of particles in the lubricating oil will change its lubrication performance, and the contact friction between particles and the bearing surface will lead to pitting and other phenomena on the contact surface, thus reducing the service life of the bearing. So lubricating oil containing large size and a large number of impurity particles should be avoided as much as possible. |
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