液粘调速离合器油膜传动性能分析及结构参数优化

发布时间：2018-07-08 08:37

  本文选题：液粘调速离合器 + 双圆弧沟槽　； 参考：《太原理工大学》2017年硕士论文

【摘要】：随着现代化工业的快速发展,节能降耗成为工业企业的生存之本,液粘调速离合器以其摩擦损耗较小的特点,在许多工程生产领域得到应用。为了使液粘调速离合器更好的满足高速、重载、高精度等复杂工况,本文以液粘调速离合器为出发点,应用FLUENT计算流体动力学软件对其摩擦副一对摩擦片之间的薄膜流体进行数值计算,分析了影响双圆弧结构摩擦片间隙内薄膜流体传动性能的外部因素,对离合器接合时产生的空化现象展开了研究。分析了双圆弧沟槽摩擦片结构参数对油膜传动性能的影响,在此基础上对结构参数进行优化,使其有更好的油膜传递转矩能力及优良的散热能力,为双圆弧槽结构摩擦片的设计提供理论依据。本论文的主要研究内容如下:1)介绍了液粘调速离合器流体流场数值计算理论方法,主要包括:液粘传动基础理论、液粘传动数学模型、湍流模型以及空化模型。根据其各自特点选择出本文需要的模型,为本文数值计算提供理论铺垫和参考依据,选择适用于重载场合的双圆弧槽摩擦片结构进行研究。2)对影响双圆弧槽油膜传动性能的外部因素进行分析,研究工作油粘度、进油温度以及转速对油膜传递转矩的影响,着重分析了液粘调速离合器在接合过程中产生的空化现象及影响空化程度的因素,对比了空化前后各个参数对油膜转矩传递的影响。结果表明:工作油粘度及主动摩擦片转速对空化影响较大,粘度的增大、主动摩擦片转速的增加,使得空化体积分数明显增加;转速对空化区域的大小及产生位置有较大影响;工作油表面张力及进油压力对空化几乎没有影响。工作油粘度和主动摩擦片转速与油膜可传递转矩呈正相关,进油温度与油膜可传递转矩呈负相关,工作油粘度取0.015Pa·s-0.025Pa·s,进油温度取45℃-55℃时传递性能较好,转速必须控制在合理的范围内,不可过高。考虑空化现象相比于不考虑空化现象,油膜可传递转矩都有着不同程度的减小。3)分析了不同摩擦片沟槽结构的工作特点,突出研究双圆弧沟槽摩擦片结构薄膜流体。分析了双圆弧沟槽结构参数发生变化时油膜传递性能的变化,结构参数主要包括油槽角度、油槽深度以及油槽数量。重点研究这些参数对油膜压力、温度及传递扭矩等传递性能的影响,并对比了油膜空化前后压力及温度的变化。最终通过控制变量法,综合对比油槽初始角、深度及数目的最优范围并进行优化,得出双圆弧沟槽初始角度为47.5°,油槽深度为0.3mm,油槽数目为57时传递转矩最大,且有着良好的散热能力,为双圆弧槽结构摩擦片的设计提供理论依据。
[Abstract]:With the rapid development of modern industry, energy-saving and consumption reduction become the survival of industrial enterprises. The liquid-viscosity speed regulating clutch has been applied in many engineering fields because of its low friction loss. In order to make the fluid viscosity speed regulating clutch better meet the complex working conditions such as high speed, heavy load and high precision, this paper takes the liquid viscosity speed regulating clutch as the starting point. The thin film fluid between a pair of friction plates of the friction pair is numerically calculated with fluent computational fluid dynamics software. The external factors affecting the performance of the film fluid drive in the gap between the friction plates of the double circular arc structure are analyzed. The cavitation phenomenon of clutch joint is studied. The influence of structural parameters on the performance of oil film transmission is analyzed. On the basis of this, the structure parameters are optimized to have better oil film transfer torque and excellent heat dissipation ability. It provides a theoretical basis for the design of friction sheet with double arc groove structure. The main contents of this paper are as follows: (1) the numerical calculation method of fluid flow field of fluid viscosity speed regulating clutch is introduced, including: basic theory of fluid viscosity transmission, mathematical model of fluid viscosity transmission, turbulence model and cavitation model. According to their respective characteristics, the model needed in this paper is selected, which provides the theoretical foundation and reference basis for the numerical calculation of this paper. Select the structure of double circular arc groove friction plate suitable for heavy load. 2) analyze the external factors that affect the performance of double circular arc groove oil film transmission, and study the effects of working oil viscosity, oil inlet temperature and rotational speed on the oil film transfer torque. The cavitation phenomenon and the factors affecting the cavitation degree of the liquid-viscosity speed regulating clutch during the process of engagement are analyzed emphatically. The effects of the parameters before and after cavitation on the torque transfer of the oil film are compared. The results show that the viscosity of the working oil and the rotational speed of the active friction plate have great influence on the cavitation, the increase of the viscosity and the increase of the rotational speed of the active friction plate make the cavitation volume fraction increase obviously, and the rotational speed has a great influence on the size and the position of the cavitation region. The surface tension and inlet pressure of working oil have little effect on cavitation. The viscosity of the working oil and the rotational speed of the active friction plate are positively correlated with the oil film transferable torque, and the oil inlet temperature is negatively correlated with the oil film transferable torque. When the working oil viscosity is 0.015 Pa s-0.025 Pa / s and the oil inlet temperature is 45 鈩，

本文编号：2106849