It is necessary to make the running car forcefully decelerate or even stop according to the driver's request, so that the stopped car can be stably parked under various road conditions (including on the slope), so that the speed of the downhill car is stable, both The car brake function must be used. The car brake function is provided by the brake system. It can be seen that the car brake system plays an important role in ensuring the safety of the car, the reliability of the parking and the economic benefits of transportation. With the rapid development of highways and the increase of vehicle speed and the increasing traffic density, the operational reliability of automotive brake systems is becoming more and more important. Therefore, many brake regulations have put forward many detailed and specific requirements for the brake system. It is very important to improve the brake structure and solve the outstanding problems that restrict its performance.

With the development of China's automobile industry, especially the introduction of joint ventures and advanced foreign technology, the use of disc brakes in automobiles has gradually formed scale in China. Since 2000, China's disc brake market demand growth rate has developed very fast. According to the statistics of the China Association of Automobile Manufacturers, the output of China's disc brakes in 2000 was only 575,800 sets. By 2004, it had grown rapidly to 4,867,200 sets, an increase of more than 7 times, with an average annual growth rate of 68.9%. Up to 10 million sets. The stable braking performance of the disc brakes has gradually replaced the drum brakes. Therefore, it is important to design a disc brake that is stable and safe and reliable.

In the research of disc brakes at home and abroad, the early focus on the experimental study of its friction characteristics, as the user's requirements for its braking performance and service life continue to improve, research on its basic theory and application is also in-depth, such as The study of friction mechanism and the analysis of braking noise provide a theoretical basis for the improvement and optimization of disc brake structure. In addition, the research and development of modern automobile disc brakes should focus on improving the braking performance of the brakes. Prevent dust and rust, reduce weight, simplify structure, reduce cost, develop electronic alarm and intelligent system, and have more practicability and longer life.

At present, disc brakes have been used on the front and rear wheels of mid- to high-class cars. However, there are still many economical cars that are not completely disc brakes, but the front disc rear drum type hybrid brakes (ie, the front wheel uses a disc brake and the rear wheel uses a drum brake), which is mainly Cost considerations. Disc brakes have also been used on trucks, but there is still a considerable distance from completely replacing drum brakes. However, with the increase of highway grades, the rise of passenger grades, especially the enforcement of national safety regulations, the use of disc brakes for the front and rear wheels will be a trend.

2. 研究的基本内容与方案

2.1Research basics

(1)Carefully study the relevant literature and existing design materials to understand the entire design process.

(2)According to the design model, the disc brake structure is selected to complete the design calculation of the main parameters of the brake.

(3)Part drawing and assembly drawing are done using the three-dimensional drawing software CATIA.

(4)Check the main components, design rationality, practical analysis and evaluation.