介绍了EQ40 1 2系列液力换向传动箱的结构特点、工作原理和性能。运用考核表明 ,该产品技术成熟 ,设计合理 ,特别是由于采用了自行开发研制的封闭循环圆技术 ,提高了性能和可靠性 ,可以实现一个大修期不开箱检修的目标。 The structural features, working principle and performance of the EQ40 1 2 series hydrodynamic reversing gearbox are introduced. The use of assessment shows that the product is mature technology and reasonable design, especially due to the use of a closed-loop technology developed by itself to improve the performance and reliability, and to achieve an overhaul without opening the box overhauling the goal.