基于EHL蜗杆传动的摩擦特性分析及摩擦学设计

发布时间：2018-01-15 22:07

本文关键词：基于EHL蜗杆传动的摩擦特性分析及摩擦学设计　出处：《延边大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文研究弹性流体动力润滑下蜗杆传动的摩擦特性分析及摩擦学设计,通过Hertz接触理论和雷诺润滑理论的结合,探求线接触弹流润滑问题的求解方法,从而把握最小油膜厚度的计算求解。本文首先研究特定参数对蜗杆传动润滑特性的影响,探究影响最小油膜厚度的因素,从而为蜗杆传动减少摩擦、磨损及摩擦学设计提供依据。然后利用CATIA建立蜗杆传动模型,并计算蜗轮啮入点、节点和啮出点的最小油膜厚度、膜厚比、摩擦系数和摩擦力。本文设计四组实验数据,自变量分别是润滑油黏度、蜗杆转速和表面粗糙度,分别探究自变量对蜗杆传动的最小油膜厚度、膜厚比、摩擦系数及摩擦力的作用,充分分析弹流润滑下蜗杆传动的摩擦特性。最后,利用蜗杆传动的强度设计和以最小油膜厚度为准则的润滑设计,将两者紧密结合,建立蜗杆传动的摩擦学设计公式。摩擦学设计不仅满足齿面接触疲劳强度要求,同时也减小了蜗杆传动中不必要的摩擦和磨损,满足了接触表面的润滑要求。相对于齿轮传动、滚动轴承的弹流润滑问题,蜗杆传动的研究与资料显然要少的很多,因此研究弹流润滑下的蜗杆传动更具有实践意义和必要性。只有了解蜗杆传动的摩擦和润滑问题,才能整体把握蜗杆传动的摩擦特性,才能有更好的设计方法和准则,提高蜗杆传动的使用寿命和传动效率。弹流润滑理论是机械摩擦学中的一类分支,本文研究内容也为其他零部件的摩擦特性研究及摩擦学设计提供了依据和参照,对现实生活中也存在着非常重要的研究意义。另一方面,蜗杆传动的主要摩擦方式是滑动摩擦,不同于齿轮传动等滚动摩擦方式,因此蜗杆传动的接触表面更容易发生摩擦和磨损,从而对润滑油、润滑方法和润滑装置的要求会更大。蜗杆传动工作时,会因为摩擦生热产生很多问题,温度升高,润滑油的黏度就会降低,从而影响弹流润滑下蜗杆传动的摩擦特性,因此润滑油的物理性质也是摩擦学中应该注意的问题。通过上述内容的论述,阐明了本文的研究内容及研究意义,本文通过每一章节的内容分别阐述了弹流润滑下蜗杆传动不同的摩擦特性,用实验数据清晰解释了摩擦特性之间的关系。
[Abstract]:In this paper, the friction characteristic analysis and tribological design of worm drive under elastohydrodynamic lubrication are studied. Through the combination of Hertz contact theory and Reynolds lubrication theory, the solution method of linear contact elastohydrodynamic lubrication problem is explored. In order to grasp the calculation solution of the minimum oil film thickness. Firstly, this paper studies the influence of specific parameters on the lubrication characteristics of worm transmission, and explores the factors that affect the minimum oil film thickness, thus reducing friction for worm transmission. The wear and tribology design provides the basis. Then the worm transmission model is established by using CATIA, and the minimum oil film thickness and film thickness ratio are calculated for the wormgear gnawing point, the node and the gnawing point. Friction coefficient and friction force. Four groups of experimental data are designed in this paper. The independent variables are viscosity of lubricating oil, rotational speed of worm and surface roughness, respectively, to explore the minimum oil film thickness and film thickness ratio of the independent variables to worm transmission. Friction coefficient and friction force fully analyze the friction characteristics of worm drive under elastohydrodynamic lubrication. Finally, the worm drive strength design and lubrication design based on the minimum oil film thickness are closely combined. The tribological design formula of worm transmission is established. The tribological design not only meets the requirements of tooth surface contact fatigue strength, but also reduces the unnecessary friction and wear in worm drive. Compared with the elastohydrodynamic lubrication problem of the rolling bearing, the research and data of worm drive are obviously less. Therefore, the study of worm transmission under elastohydrodynamic lubrication has practical significance and necessity. Only by understanding the friction and lubrication problems of worm transmission, can the friction characteristics of worm drive be grasped as a whole. The theory of elastohydrodynamic lubrication is a branch of mechanical tribology. This paper also provides the basis and reference for the study of friction characteristics and tribological design of other parts, and also has very important research significance to the real life. On the other hand. The main friction mode of worm transmission is sliding friction, which is different from the rolling friction mode such as gear transmission, so the contact surface of worm transmission is more prone to friction and wear, thus lubricating oil. Lubrication methods and lubricating devices will be more demanding. When worm drive work, there will be a lot of problems due to friction heat, the higher the temperature, the lower the viscosity of lubricating oil. Therefore, the physical properties of lubricating oil should also be paid attention to in tribology. Through the discussion of the above contents, the research content and significance of this paper are expounded. In this paper, the different friction characteristics of the worm drive under elastohydrodynamic lubrication are explained by the contents of each chapter, and the relationship between the friction characteristics is explained clearly by the experimental data.
【学位授予单位】：延边大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH132.44

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