CVT封闭的2K-H型差动轮系啮合效率分析

针对封闭式无级变速器内部容易发生功率循环而造成效率降低的问题,以输入耦合CVT(Continuously Variable Transmission)传动系统为研究对象,简单地介绍了其基本结构及工作原理,在无能量损失的理想状态下详细推导了该传动系统实现功率分流的充分条件。其次,在该充分条件下简化了输入耦合CVT传动系统中起汇流作用的2K-H型差动轮系啮合效率表达式,得到了影响啮合效率的输入构件结构参数和运动状态等因素,求证了其获得最大值的条件。最后,通过实例验证了所得到的2K-H型差动轮系啮合效率最大条件的正确性。结果表明,该条件从设计的角度保证了2K-H型差动轮系啮合效率最大,是一种行之有效的设计方法。

Meshing efficiency analysis of 2K-H type differential gear train closed by CVT

For the problem that power circulation and low efficiency easily occur in closed Continuously Variable Transmission(CVT),the input-coupled CVT drive system was taken as the object of study,the fundamental structure and working principle of the input-coupled CVT drive system were briefly introduced.Without loss of energy in the input-coupled CVT drive system,the sufficient condition for the input-coupled CVT drive system to realize power split was deduced in detail.Next,under the sufficient condition,the meshing efficiency expression for the 2K-H type differential gear train acting as power confluence in the input-coupled CVT drive system was simplified,and the factors related to meshing efficiency of the 2K-H type differential gear train such as the structural parameter and motion state of input components were obtained.The conditions for meshing efficiency of the 2K-H type differential gear train to be maximized were demonstrated.Finally,the conditions of maximum meshing efficiency for the 2K-H type differential gear train were verified by analyzing the examples.The results show that the conditions of maximum meshing efficiency ensure the highest meshing efficiency of the 2K-H type differential gear train from the design point of view.The idea of maximizing the meshing efficiency analysis of the 2K-H type differential gear train is an effective design approach.