摘  要

       AMT是一种经济型的自动变速器，在重型载货车上具有广阔的应用空间。目前，中国重型车辆装用的都是手动机械式变速器，并且形成了相当规模的生产能力。与AT相比，AMT更适合中国汽车工业的现实，国内重型车采用AMT自动变速技术既可以保留原有的手动变速器生产线，又可大大节省用于重建专业生产线及设备的投资，具有重要的现实意义。
在电控机械式自动变速器设计开发中，离合器和选换档执行机构的设计及优化是AMT设计的重点和难点之一，其性能直接影响AMT系统的性能，本文以法士特12JS200TA变速器为基础，进行AMT系统液压驱动执行机构的设计。
本文的主要工作内容如下:
1.分析了国内外重型车自动变速技术的发展，对重型车AMT的关键技术问题及操纵系统结构进行了阐述。
2.分析了AMT液压驱动系统的设计要求及结构，并针对法士特12JS200TA 12挡带同步器的手动变速器，在原有离合器和变速器操纵机构的基础上设计了新型的液压驱动自动操纵机构。
3.进行了AMT液压驱动机构的元件计算、选型及系统仿真、分析。对液压回路重要元件进行了选型并对动态响应速度进行了动态分析。
关键词：AMT；液压驱动；换挡执行机构；离合器执行机构；节气门执行器

ABSTRACT

    AMT is an economical automatic transmission; therefore it has extensive，application space in the heavy truck. Currently, heavy vehicles are all equipped with manual transmission, and forms production capacity on a quite scale. AMT is more suitable for automotive industry reality in china than AT. The development and production of AMT may retain previous product line of manual transmission and greatly save the investment for reconstruction of professional production line and equipment, so it has important reality meaning.
During the design and development of AMT, design and optimization of selection-shift actuator is one of key and special difficulties for AMT design. The performance will have direct effect on the whole performance of AMT system. In this paper, Taking focus on a manual transmission of heavy truck, combing with science and technology research plan of Chongqing, shift actuator with hydraulic drive for AMT system is developed and designed and its performance is researched.
In this paper, the main contents are showed as follows:
1.The development of automatic transmission technique for heavy truck both home and abroad is introduced. The key technique of automatic transmission for heavy truck and operation system configuration are illustrated.
2. Analysis of the AMT hydraulic drive system and structural design requirements, and file for Fast 12JS200TA 12 manual transmission with a synchronizer, the original clutch and transmission control mechanism based on the design of a new type of hydraulic-driven auto-control mechanism.
3. For the AMT calculation of the hydraulic drive mechanism of the components, selection and system simulation and analysis. Important components of the hydraulic circuit and the dynamic response of the selection of the dynamic analysis.
Keywords: Atotomatic manual transmission（AMT）；Hydraulic drive；Shift executing agency；Clutch executing agency；Air damper actuator目  录