多分支非圆齿轮无级变速机构设计与分析

无级变速传动是车辆传动系统的重要组成部分。结合非圆齿轮传动特性，提出一种新型多分支非圆齿轮无级变速机构，采用非圆齿轮副、差速机构与传动选择机构的组合实现无级变速传动，且最终传动比取决于两对非圆齿轮副之间的相位角。分析多分支非圆齿轮无级变速机构的传动原理，针对单对非圆齿轮副，分别进行节曲线、齿廓和平衡特性设计，并基于仿真加工得到非圆齿轮齿廓与三维实体模型。通过ADAMS软件仿真和传动实验，将该机构整体传动比特性理论结果分别与仿真和实验结果进行对比，机构整体传动比仿真和实验结果与理论值的最大误差分别约为4.5%和5.6%；通过非圆齿轮加工与传动实验，对其传动比特性进行理论、仿真和实验对比，齿轮副传动比仿真和实验结果与理论值的最大误差分别约为3.5%和6.3%. 考虑加工误差、装配误差与测量误差等影响，仿真和传动实验的误差均在合理误差范围内，验证了理论分析方法的正确性。

Design and Analysis of Multi-branch Non-circular Gear Continuously Variable Transmission Mechanism

Continuously variable transmision is an important component of vehicle transmision system. A new type of multi-branch non-circular gear continuously variable transmission mechanism is proposed based on the transmission characteristics of non-circular gear. The continuously variable transmission is realized by the combination of non-circular gear pair，differential mechanism and transmission selection mechanism，and the final transmission ratio depends on the phase angle between two pairs of non-circular gears. The transmission principle of multi-branch non-circular gear continuously variable transmission mechanism is analyzed. The pitch curve，tooth profile and balancing characteristics are designed for non-circular gear pair，and the tooth profile and three-dimensional solid model of non-circular gear are obtained through simulation processing. The overall transmission ratio characteristics of the mechanism are compared and analyzed in theory，simulation and experiment through the ADAMS simulation and transmission experiment，and the maximum simulated and experimental errors of overall transmission ratio are about 4.5% and 5.6%, respectively. The transmission ratio characteristics of single gear pair are compared through the non-circular gear manufacturing and transmission experiment，and the maximum simulated and experimental errors of transmission ratio of gear pair are about 3.5% and 6.3%, respectively. Considering the influences of manufacturing error，assembly error and measurement error， the simulated and transmission experimental errors are all within the reasonable error range，which verifies the correctness of the theoretical analysis method.