| LI Qun,LIU Xiaoling,GUO Feng,ZHOU Jiaao,ZHANG Zheng.Enhanced Regulation of Water Lubrication on Steel/Rubber Contact Surfaces Based on Thermal Mixed Lubrication[J],53(3):142-151, 178 |
| Enhanced Regulation of Water Lubrication on Steel/Rubber Contact Surfaces Based on Thermal Mixed Lubrication |
| Received:December 12, 2022 Revised:May 18, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.03.014 |
| KeyWord:water lubrication thermal mixed lubrication roughness water-based lubricant water supply pressure Stribeck curve |
| Author | Institution |
| LI Qun |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| LIU Xiaoling |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| GUO Feng |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| ZHOU Jiaao |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| ZHANG Zheng |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
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| Abstract: |
| Due to the low viscosity of water, the water-lubricated bearing is prone to friction and wear. In order to guide the design of water-lubricated bearings under mixed lubrication, it is necessary to enhance the lubrication performance of steel/rubber friction pairs with water as the lubricant. For this goal, a thermal mixed lubrication model of steel/rubber friction pairs under water lubrication was established, and the thermal effects on lubrication performance were discussed by a comparative study. On this basis, the effects of surface roughness, viscosity of water-based lubricant and water supply pressure on the regulation of water lubrication enhancement were further studied with consideration of the Stribeck curve. The results showed that, when the friction coefficient for thermal solution was the same as that of isothermal solution, the rotational speed of thermal solution was greater than that of isothermal solution, which made the Stribeck curve shift to the right. Different from the isothermal solution, the thermal effect increased the friction coefficient and the load ratio, and decreased the film thickness ratio for the same rotational speed. The maximum water film temperature increased with the increase of the rotating speed, and the thermal effect had a significant impact on the mixed lubrication performance. For the thermal mixed lubrication of steel/rubber pairs, when the surface roughness of the friction pair reduced, the Stribeck curve moved to the left. At the same rotational speed, the load ratio decreased, while the film thickness ratio increased with the decrease of surface roughness; In addition, the larger the surface roughness, the higher the temperature of the water film and steel/rubber friction pair. The highest temperature was located in the outlet of the contact region, and the surface temperature of the steel was lower than that of the water film and the rubber. When the rotational speed was constant for different viscosity of water-based lubricant, increasing the viscosity could increase the film thickness ratio, and reduce the load ratio and the maximum water film temperature. When the friction coefficient was the same, the higher the viscosity, the lower the rotational speed, therefore, the Stribeck curve shifted to the left. As the water supply pressure increased, the water film pressure distribution was improved, resulting in an increase in the water film bearing area, a decrease in the water film pressure, and a decrease in the rough peak contact pressure and its bearing area, so that the load ratio decreased, the film thickness ratio increased, the Stribeck curve shifted to the left, and the maximum temperature of the water film decreased. Moreover, the maximum temperature of the water film increased firstly and then decreased with the increase of the rotating speed, and the maximum temperature of the water film appearred an inflection point, and the inflection point moved to the left with the increase of the water supply pressure. The reason was that the speed at the inflection point was correspondingly the transition of the lubrication state from boundary lubrication to mixed lubrication. It can be concluded that the thermal effects will weaken the mixed lubrication performance of the friction pair and cannot be negligible in the mixed lubrication. When considering the thermal effect, reducing the surface roughness, increasing the viscosity of water-based lubricant and water supply pressure are beneficial to enhance the mixed lubrication performance of water lubrication on the steel/rubber contact surface. |
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