摆线针轮传动弹性流体动力润滑特性研究
[Abstract]:Cycloidal needle wheel transmission is widely used in micro instruments, robots and test instruments because of its high transmission accuracy, high transmission ratio, compact structure and long service cycle. The research of cycloidal needle wheel transmission is mainly focused on the profile modification of cycloid gear, innovative structure theory and advanced processing technology, but less on lubrication characteristics. The lubrication characteristics of cycloidal needle wheel transmission not only affect the transmission accuracy and contact fatigue, but also affect the dynamic characteristics and transmission efficiency of transmission system. Therefore, it is necessary to analyze the lubrication characteristics of cycloid needle wheel transmission. It provides the tribological theory basis for the design of cycloidal needle wheel transmission parameters. The main contents of this paper are as follows: 1: 1 cycloidal needle wheel drive thermal elastohydrodynamic lubrication numerical analysis model. By analyzing the geometry and kinematics of cycloid needle wheel transmission, the parameters such as equivalent curvature radius, entrainment velocity and meshing force are obtained. Based on Newtonian Ostwald and Eyring fluid, a numerical model of contact time-varying thermal elastohydrodynamic lubrication (THL) for cycloidal needle wheel transmission is established by using generalized Reynolds equation. 2. The lubrication characteristics of cycloidal needle wheel drive are studied. Under the condition of pure rolling contact of cycloidal needle wheel transmission, the influence of different fluids on friction coefficient and friction loss power in meshing process is studied. The influence of non-Newtonian characteristics of Eyring fluid and Ostwald fluid on the lubrication characteristics of cycloidal needle wheel transmission during meshing is discussed. The influence of design parameters on lubrication characteristics of cycloidal needle wheel transmission is discussed. The lubrication state of cycloid needle wheel transmission is evaluated by using the minimum film thickness, friction coefficient and friction loss power in meshing process, and the short amplitude coefficient is discussed. Influence of change of needle tooth radius and modification parameters on lubrication characteristics of cycloidal needle wheel drive. 4. Study on lubrication characteristics of cycloid needle wheel transmission with lack of oil. A numerical model of oil lubrication in cycloidal needle wheel drive was established. The inlet oil film thickness was used as the input parameter to characterize the variation of the degree of spent oil. The starting position of oil film temperature, central film thickness and effective film thickness was studied. The influence of lubricating efficiency, friction coefficient and friction loss power, and the influence of operating conditions and non-Newtonian characteristics on the thickness of inlet oil film. 5. The influence of oil supply quantity on the lubrication characteristics of cycloidal needle wheel drive. The influence of the variation of oil supply along tooth width on the distribution of pressure and film thickness in the direction of tooth width is discussed. The influence of different distribution of oil supply on the lubrication characteristics of cycloidal needle wheel drive is studied. The variation of fuel supply in meshing process is obtained with different optimization objectives.
【学位授予单位】:重庆大学
【学位级别】:博士
【学位授予年份】:2016
【分类号】:TH132.4
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