Abstract: The countershaft is one of the core components of the transmission, which requires high accuracy and is difficult to assemble. Hot fitting process is widely used in the industry to gears assembly. However, how to ensure accuracy while being compatible with multiple models and achieve rapid production change. It has long been an industry challenge. In response to this problem, the article has developed a set of high-precision hot-fit-tooth methods and mechanisms for highly flexible countershaft, which has been applied to batch production. It ensures accuracy while being compatible with multiple models, and achieves rapid production change, and is suitable for highly flexible automated production lines. This article provides a detailed introduction of this process method and mechanism for reference in the same industry.

Key words: Countershaft; Transmission; Hot-fit-tooth; Rapid production change

摘要： 中间轴总成是变速器核心零部件之一，其精度要求高，装配难度大，行业内普遍应用 热装对齿工艺进行装配。但如何在保证装配精度的同时，兼容多种机型，并实现快速换产， 长期以来属于行业难题。文章开发出一套高柔性全自动中间轴热装精密对齿方法及机构，并 已应用到批量生产中，能够在保证装配精度的同时，兼容多种机型，实现快速换产，适用于 高柔性自动化产线，具有很大的推广意义。

关键词: 中间轴；变速器；热装对齿；快速换产