当今社会是技术高速发展的社会，汽车科技的发展更是日新月异。目前很多还比较先进的技术在未来的一段时间以后将进化成更先进的技术或被彻底取消。例如，在上个世纪初，福特T型车上采用的链条传动方式在当时是先进的，而现在，连大型的摩托车都放弃了这种传动方式，轴传动已成 Today’s society is a society with rapid technological development. The development of automotive science and technology is changing with each passing day. At present, many of the more advanced technologies will evolve into more advanced technologies or be completely eliminated after some time in the future. For example, at the beginning of the last century, the chain drive mode adopted on the Ford T-car was advanced at the time. Nowadays, even large motorcycles have abandoned this drive mode and the shaft drive has become