针对某电动汽车高速轮边减速器振动大、噪声强度高等关键问题，建立该减速器齿轮传动系统动态啮合分析模型，对额定功率、最高转速与最大转矩3种工况的各级齿轮副的啮合特性与动态响应进行计算，分析系统振动结构噪声幅值及其分布规律，研究关键重合度设计参数对系统动态啮合性能的影响，基于MASTA提出传动系统宏观几何参数优化方案。研究结果表明：各工况下输出级齿轮副的传动误差峰峰值偏大，高速输入轴轴承处的结构噪声最大；与轴向重合度为非整数设计工况相比，当齿轮副的轴向重合度接近整数时，齿轮副接触线长度变化率较小，啮合过程中接触载荷波动较小，啮合刚度变化率明显降低，齿轮箱各轴承处结构噪声得到明显降低；宏观几何参数优化方案使得各齿轮副动态性能得到一定的提升。

For the key problems of high noise and vibration of high-speed wheel reducer used in electric vehicle, a dynamic model of the wheel reducer is developed and the mesh characteristics and dynamic characteristics are investigated under rated power, maximum speed and maximum torque load conditions. Then the amplitude of structural noise is calculated and analyzed. Also the effect of contact ratio on the dynamic performance of the system is evaluated and macro geometry parameters of the transmission system are optimized by using MASTA. Results show that the peak-to-peak values of the transmission errors for the output gears are relatively higher and the main structural noise comes from the high-speed input shaft. Compared with the design with contact ratio as a non-integer value, the design with an integer contact ratio leads to a lower changing ratio of total length of contact lines and the contact load fluctuation, the changing ratio of the mesh stiffness and the structural noise from the bearings supporting locations are decreased obviously. The optimization of macro parameters makes the dynamic performance of gear pairs better.

重庆市基础与前沿研究计划资助项目（cstc2016jcyjA0415）；中国博士后科学基金资助项目（2015M582517）；重庆市博士后科研项目特别资助项目（Xm2016004）；国家自然科学基金资助项目（51405043，51575060）。