To improve the performance of the electric vehicles (EVs), significantly reduce unsprung mass, and improve system reliability, in the present paper, the authors propose a novel in-wheel two-speed automatic manual transmission (WH-AMT) structure which weighs only 16.8 kg. The proposed WH-AMT is composed of a high-speed drive motor unit, gear transmission unit, and shift actuator unit. The gear transmission system has no free planet carrier and ring gear, which improves the reliability of the WH-AMT in the harsh working environment within the wheel. Owing to the integrated design in the wheel, the free space in the wheel is increased, and unsprung mass is greatly reduced. In this study, kinematic analysis of the WH-AMT, derivation of its dynamic equations, and development of a simulation model of the shifting process are carried out. The results indicate that there is no power interruption in the WH-AMT during gear shifting, and the shift quality is high, which considerably enhances the power performance of EVs.

为了提高电动汽车的性能，显着减少簧下质量并提高系统可靠性，在本文中，作者提出了一种新颖的轮内两速自动手动变速器（WH-AMT）结构，该结构仅重16.8公斤 提出的WH-AMT由高速驱动电机单元，齿轮传动单元和变速执行器单元组成。齿轮传动系统没有自由的行星齿轮架和齿圈，从而提高了WH-AMT在车轮内恶劣工作环境中的可靠性。由于车轮中的集成设计，增加了车轮中的自由空间，并大大减少了簧下质量。在这项研究中，进行了WH-AMT的运动学分析，其动力学方程的推导以及变速过程仿真模型的开发。