Abstract: In view of the low passability of the mountain modular electric chassis and the large size of the agricultural planetary reducer, a twostage planetary reducer with power output on the same side and coaxial input shaft and output flange is designed. In accordance with the reliability design theory, an optimization analysis model with the objective of gear volume and minimum is built, and the number of teeth, modulus and other parameters are obtained according to the concentric conditions, assembly conditions and other constraints, and a threedimensional model of the planetary reducer with same side output is established. The total volume of the planetary gearbox was reduced by 5.3% and the radial dimensions by 6.2% after optimization by means of reliability design theory, resulting in an average reduction of 13.9% in the lateral displacement of the tracks. The modal and static analysis of the transmission using ANSYS showed that the 1st order intrinsic frequency of the transmission was 676.94Hz which was much higher than the vibration frequency of the gearbox at 73.91Hz. The maximum stress of 240.72MPa in the output flange of the planetary gearbox is less than its yield limit and meets the strength requirements.

Key words: planetary reducer, structural optimization, electric chassis, lightweight, modal analysis, vehicle and power

摘要： 针对山地模块化电动底盘通过性较低以及农用行星减速器体积较大问题，设计一款动力同侧输出且输入轴与输出法兰同轴的二级行星减速器。按照可靠性设计理论，搭建目标为齿轮体积和最小的优化分析模型，并依据同心条件、装配条件等建立约束条件得到齿数、模数等参数，建立同侧输出行星减速器三维模型。通过可靠性设计理论优化后的行星减速器总体积降低5.3%，径向尺寸降低6.2%，使得履带横向位移平均减少13.9%，利用ANSYS针对传动装置进行模态和静力学分析，其传动装置的1阶固有频率为676.94Hz远大于减速器的振动频率73.91Hz，不会引起传动装置共振，其输出法兰应力最大值为240.72MPa小于其屈服极限，满足强度要求。

关键词: 行星减速器, 结构优化, 电动底盘, 轻量化, 模态分析, 车辆与动力