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Dynamic Characteristic Analysis and Clutch Engagement Test of HMCVT in the High-Power Tractor
Complexity ( IF 2.462 ) Pub Date : 2021-01-13 , DOI: 10.1155/2021/8891127
Yuan Chen; Yu Qian; Zhixiong Lu; Shuang Zhou; Maohua Xiao; Petr Bartos; Yeping Xiong; Guanghu Jin; Wei Zhang

Hydromechanical continuously variable transmission (HMCVT) is capable of bearing large torque and has wide transmission range, which is suitable for high-power tractors. Dynamic characteristics could influence the tractor life, especially in a high-power tractor. Wet clutch is the crucial component in the HMCVT, which could smooth and soft power transmission. Therefore, it is important to study the dynamic characteristics and implement the wet clutch test of HMCVT. In this paper, AMESim is used to establish virtual models of gearbox, pump-controlled hydraulic motor system, and shifting hydraulic system. Then, a simulation study of tractor operation under working condition is carried out. The internal and external meshing forces of the planetary row are analyzed. Finally, the wet clutch engagement process of HMCVT in the high-power tractor is tested to verify the oil pressure. The simulation results show that the values of internal and external meshing force become larger as the throttle opening increases. At the moment of shifting change, the meshing forces of the planetary gear have great impact. The clutch test shows that the trend of the oil filling curve obtained from the bench test is similar to that obtained from the theoretical curve, which verifies the simulation results.

中文翻译:

大功率拖拉机中HMCVT的动态特性分析与离合器啮合试验

液压机械无级变速器(HMCVT)能够承受大扭矩,并且具有较宽的传动范围,适用于大功率拖拉机。动态特性可能会影响拖拉机的使用寿命,尤其是在大功率拖拉机中。湿式离合器是HMCVT中的关键组件,它可以使动力传递平稳而柔和。因此,重要的是研究HMCVT的动态特性并进行湿式离合器测试。在本文中,AMESim用于建立变速箱,泵控制液压马达系统和变速液压系统的虚拟模型。然后,对拖拉机在工况下的运行进行了仿真研究。分析了行星行的内部和外部啮合力。最后,对HMCVT在大功率拖拉机中的湿式离合器接合过程进行了测试,以验证油压。仿真结果表明,随着节气门开度的增大,内,外啮合力的值增大。在换档时,行星齿轮的啮合力会产生很大的影响。离合器测试表明,从台架试验获得的注油曲线趋势与从理论曲线获得的趋势相似,从而验证了模拟结果。
更新日期:2021-01-13
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