摘 要
汽车作为陆地上的现代重要交通工具，由许多保证其性能的大部件，即所谓“总成”组成，制动系就是其中一个重要的总成，它直接影响汽车的安全性。随着高速公路的快速发展和车流密度的日益增大，交通事故也不断增加。据有关资料介绍，在由于车辆本身的问题而造成的交通事故中，制动系统故障引起的事故为总数的45%。可见，制动系统是保证行车安全的极为重要的一个系统。此外，制动系统的好坏还直接影响车辆的平均车速和车辆的运输效率，也就是保证运输经济效益的重要因素。制动系统既可以使行驶中的汽车减速，又可保证停车后的汽车能驻留原地不动。由此可见，汽车制动系统对于汽车行驶的安全性，停车的可靠性和运输经济效益起着重要的保证作用。
当今，随着高速公路网的不断扩展、汽车车速的提高以及车流密度的增大，对汽车制动系的工作可靠性要求显得日益重要。只有制动性能良好和制动系工作可靠的汽车才能充分发挥出其高速行驶的动力性能并保证行驶的安全性。由此可见，制动系是汽车非常重要的组成部分，从而对汽车制动系的机构分析与设计计算也就显得非常重要了。
本论文是设计JN2070越野四驱货车的制动系统，采用的是气压驱动机构的凸轮式鼓式制动器。为了安全考虑制动系统的气压回路采用双回路。
关键词：气压制动 制动性 传动装置
The Design of Air Brake System about JN2070 off-road four-wheel drive truck
Student: Qi Chen Advisor: Dr. Feng Cheng
School of Mechanical and Automotive Engineering
Zhejiang University of Science and Technology
Abstract
As an important modern land-based transport, Automotive components from many large parts ,namely, the so-called “assembly” which ensure the performance of automotive, and braking system which directly affects the safety of motor vehicles is one of the most important assembly. With the rapid development of highways and increased traffic density, traffic accidents are also increasing. According to the information on the vehicle itself as a result of problems caused by traffic accidents, the brake system failure caused the accident accounting for the total number of 45%. So braking system is an extremely important system to ensure traffic safety. In addition, the braking system has a direct impact on the quality of the average vehicle speed and vehicle transportation efficiency, that is, an important factor ensuring cost-effective transport. It not only can slow down a moving vehicle, but also to ensure that the car can be fixed in situ after parking. This shows that the vehicle braking system plays an important role in traffic safety, the reliability of parking, and transport economic efficiency.
Today, with ever-expanding highway network, the improvement of vehicle speed and traffic density, on the work of automotive braking system relia become increasingly important. Only vehicles which have good braking performance and reliable braking system can give full play to their high-speed dynamic performance and to ensure the safety of traveling. This shows that the braking system is a very important component of the vehicle, thus it’s very important to the analysis and design of brake system bodies.bility requirements
Keywords: air brake Brake Transmission device
