| 基于弹流润滑的无级变速器滑移控制安全区域分析 |
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| 引用本文： | 刘金刚,王宁,范坚,赵又红.基于弹流润滑的无级变速器滑移控制安全区域分析[J].中国机械工程,2019,30(13):1552. |
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| 作者姓名： | 刘金刚 王宁 范坚 赵又红 |
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| 作者单位： | 湘潭大学机械工程学院，湘潭，411105 |
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| 基金项目： | 国家自然科学基金资助项目（51475402）；
湖南省自然科学基金湘潭联合基金资助项目（2018JJ4056）；
长株潭国家自主创新示范区专项资金资助项目（2017XK2108）;
湖南省杰出青年基金资助项目（2019JJ20015） |
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| 摘 要： | 针对无级变速器滑移模式下传动失效概率增大的问题，基于弹流润滑理论分析了不同传递转矩和相对滑动速度情况下，从动轮摩擦副油膜压力、厚度及其剪切应力变化情况，建立了安全裕度模型，基于油膜极限剪切应力与最大剪切应力计算了摩擦副的安全裕度，并确定了滑移控制的安全工作区域，为滑移控制策略的制定与优化提供了依据。研究结果表明：随着从动带轮传递转矩、相对滑动速度的增大，摩擦副的安全裕度逐渐减小；当传递转矩小于130 N·m时，在所有相对滑移速度范围内均可保证摩擦副油膜处于安全状态;当传递转矩大于130 N·m时，随着相对速度的增大，摩擦副油膜失效概率增大。
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| 关 键 词： | 无级变速器 滑移控制 弹流润滑 安全工作区域 |
Analysis of CVT Safe Operation Areas under Slip Control Mode Based on Elasto-hydrodynamic Lubrication Theory |
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| Affiliation: | School of Mechanical Engineering,Xiangtan University,Xiangtan,Hunan,411105 |
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| Abstract: | For the problems of increasing the failure probability of transmission under CVT slip mode, the oil film pressure, thickness and shear stress of a secondary pulley friction pair were analyzed with elasto-hydrodynamic lubrication under different transfer torques and relative slipping speeds. The safety margin model was established, the safety margin of the friction pairs under the slip state of the metal strip was calculated based on the ultimate shear stress and maximum shear stress of the oil films. The safety margin model might be used to determine the safe working areas of the CVT slip control, which provided a basis for the formulation and optimization of slip control strategy. The results show that with the secondary pulley transfer torques, relative slipping speed increases, the friction pair of the safety margin decreased gradually； when the transmission torque is less than 130 N·m, the oil film of the friction pair is guaranteed to be in a safe state in all relative slip speed ranges; when the transmission torque is greater than 130 N·m, the failure probability of oil film increases with the increase of relative velocity. |
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| Keywords: | continuously variable transmission(CVT) slip control elasto-hydrodynamic lubrication safe operation area |
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