CVT金屬帶軸向偏移及控制方法研究
[Abstract]:Metal belt stepless transmission (CVT) is the ideal transmission device of automobile. Metal belt and main driving belt wheel, as the key parts of CVT, play the role of transmitting torque and power. At present, the CVT products used in the market are all straight busbar pulleys, which are determined by its specific speed changing mode. In the working process, the center line of the metal belt will inevitably have an axial shift. The axial migration of the metal belt makes the mechanical condition between the belt and the belt wheel more complicated, which destroys the elastohydrodynamic lubrication between the friction sheet and the belt wheel, thus affecting the transmission performance and efficiency of CVT. In this paper, the axial migration of CVT metal belt is studied, and the following works are accomplished: (1) the structural characteristics of metal belt and belt wheel in CVT are analyzed, the mechanism of axial migration of metal belt is expounded, and the basic geometric relation of CVT transmission is deduced. On this basis, the formula for calculating the thrust between friction plates and the tension between the rings of steel strips is derived, which provides a theoretical basis for further research. (2) the calculation model of the offset represented by the initial assembly size of the belt wheel is established. In this paper, the deformation of belt wheel is introduced, and the influence of wedge angle, axial deformation of belt wheel and center distance of belt wheel on the migration of metal belt is studied. (3) the force of friction sheet is analyzed when the metal belt is offset in axial direction. The finite element software is used to analyze the stress, and the results are compared with the friction plates without deviation. The formula of power loss caused by the deviation of metal strip is derived. This paper analyzes the principle and deficiency of two methods to control the axial migration of metal band, and puts forward a method to minimize the average value of axial migration. By adjusting the initial assembly size of the belt wheel to ensure the speed ratio of the metal belt without deviation. (4) to test the initial assembly size of the belt wheel obtained by the optimization calculation in this paper, the axial offset test system of the CVT metal belt is designed firstly. It is divided into three modules to carry on the detailed design. Then, taking RD-CVT as the test object, three typical conditions are tested. The results show that the transfer efficiency of the system reaches the maximum when the initial assembly size of the optimal belt wheel is calculated in this paper. That is to say the axial deviation of metal belt has the least influence on the transmission performance of CVT so it is feasible to determine the optimal initial assembly size of belt wheel.
【學位授予單位】:湘潭大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:U463.221
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