自从19世纪末第一辆汽车问世以来,已经有一百多年的时间,汽车的结构已经有了很大的变化。早期汽车的主要结构及制造方法,基本上沿用作为整车基础的车架,底盘上的大部分总成依靠车架连接成一个整体;较长一段时间,只偏重于发动机和底盘各总成的设计和制造,很少顾及车身。随着现代科学的发展,特别是近二十年以来,人 It has been more than a hundred years since the first car came out in the late 1800s and the structure of the car has changed dramatically. The main structure of the early car and manufacturing methods, basically follows the frame as the basis of the vehicle, most of the chassis assembly rely on the frame connected as a whole; longer period of time, only emphasis on the engine and chassis assembly Designed and manufactured with little regard for bodywork. With the development of modern science, especially for nearly two decades, people