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摘要: 考虑凹槽与凹坑织构之间的协同润滑效应, 在曲轴轴承表面设计了抛物线凹槽-球形凹坑复合织构, 以改善轴承的润滑性能; 为了分析抛物线凹槽-球形凹坑复合织构对曲轴轴承润滑性能的影响, 基于平均Reynolds方程和Greenwood-Tripp微凸体接触方程构建了曲轴轴承的混合润滑模型, 并采用质量守恒的边界条件处理油膜的破裂和再形成行为, 分析了凹槽织构、凹坑织构与凹槽-凹坑复合织构的摩擦学性能, 研究了凹槽-凹坑复合织构的分布位置和结构参数对轴承承载力和摩擦力的影响。分析结果表明: 凹槽-凹坑复合织构具有高于凹槽织构的承载力和低于凹坑织构的摩擦力; 存在最优的凹槽宽度为1.3mm, 凹槽面积率为0.7, 凹槽最大深度为25μm, 凹坑数量为6, 凹坑面积率为0.7, 凹坑最大深度为20μm, 使得轴承量纲为1的承载力最大; 存在最优的凹槽宽度为2.6mm, 凹槽面积率为0.7, 凹槽最大深度为30μm, 凹坑数量为15, 凹坑面积率为0.7, 凹坑最大深度为35μm, 使得轴承量纲为1的摩擦力最小; 当凹槽-凹坑复合织构的分布位置、结构参数取最优值时, 相对于无织构轴承而言, 轴承的承载力提高了4.1%, 摩擦力减小了19.6%。
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关键词:
- 表面织构 /
- 曲轴轴承 /
- 数值模拟 /
- 平均Reynolds方程 /
- 质量守恒边界条件
Abstract: The synergistic lubricating effect of grooved texture and dimpled texture was considered, and the compound texture with parabolic grooves and spherical dimples was designed on the surface of crankshaft bearing to improve its lubrication performance. In order to analyze the effect of compound texture on the lubrication performance of crankshaft bearing, a mixed lubrication model of crankshaft bearing was developed based on average Reynolds equation and Greenwood-Tripp micro-convex contact equation, the mass conservation boundary condition was used to deal with the rupture and reformulation of oil film, the tribological performances of crankshaft bearings with grooved texture, dimpled texture and compound groove-dimple texture were analyzed, and the influences of distribution locations and structure parameters of compound groove-dimple texture on the load-carrying capacity and friction force of crankshaft bearing werestudied. Analysis result shows that the compound groove-dimple texture has larger load-carrying capacity than the grooved texture and lower friction force than the dimpled texture. The maximum dimensionless load-carrying capacity is obtained when the optimal groove width is 1.3 mm, the groove area density is 0.7, the maximum groove depth is 25μm, the dimple number is 6, the dimple area density is 0.7, and the maximum dimple depth is 20μm. The minimum dimensionless friction force is also obtained when the optimal groove width is 2.6 mm, the groove area density is 0.7, the maximum groove depth is 30μm, the dimple number is 15, the dimple area density is 0.7, and the maximum dimple depth is 35μm. When the compound groove-dimple texture has optimal distribution location and structural parameters, the load-carrying capacity of textured bearing increases by 4.1% and the friction force reduces by 19.6% compared with the untextured bearing. -
图 5 量纲为1的承载力和偏心率的关系曲线
Figure 5. Relationship curves of dimensionless load-carrying capacity and eccentricity ratio
图 6 量纲为1的摩擦力和偏心率的关系曲线
Figure 6. Relationship curves of dimensionless friction force and eccentricity ratio
图 7 量纲为1的承载力和织构区域起始角度的关系曲线
Figure 7. Relationship curves of dimensionless load-carrying capacity and start angle of textured zone
图 8 量纲为1的承载力和角度比的关系曲线
Figure 8. Relationship curve of dimensionless load-carrying capacity and angle ratio
图 9 量纲为1的承载力和凹槽面积率的关系曲线
Figure 9. Relationship curves of dimensionless load-carrying capacity and groove area density
图 10 量纲为1的承载力和凹槽最大深度的关系曲线
Figure 10. Relationship curves of dimensionless load-carrying capacity and groove maximum depth
图 11 量纲为1的承载力和凹坑面积率的关系曲线
Figure 11. Relationship curves of dimensionless load-carrying capacity and dimple area density
图 12 量纲为1的承载力和凹坑最大深度的关系曲线
Figure 12. Relationship curves of dimensionless load-carrying capacity and dimple maximum depth
图 14 量纲为1的承载力最大时复合织构轴承的压力分布
Figure 14. Pressure distribution of bearing with compound texture when dimensionless load-carrying capacity is largest
图 15 量纲为1的摩擦力和织构区域起始角度的关系曲线
Figure 15. Relationship curves of dimensionless friction force and start angle of textured zone
图 16 量纲为1的摩擦力和角度比的关系曲线
Figure 16. Relationship curve of dimensionless friction force and angle ratio
图 17 量纲为1的摩擦力和凹槽面积率的关系曲线
Figure 17. Relationship curves of dimensionless friction force and groove area density
图 18 量纲为1的摩擦力和凹槽最大深度的关系曲线
Figure 18. Relationship curves of dimensionless friction force and groove maximum depth
图 19 量纲为1的摩擦力和凹坑面积率的关系曲线
Figure 19. Relationship curves of dimensionless friction force and dimple area density
图 20 量纲为1的摩擦力和凹坑最大深度的关系曲线
Figure 20. Relationship curves of dimensionless friction force and dimple maximum depth
图 21 量纲为1的摩擦力最小时有无织构的轴承压力分布
Figure 21. Pressure distributions of textured and untextured bearings when dimensionless friction force is smallest
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