Drum brakes have a good role from the brake, due to the brake to make the film outside, the wheel rotation with an external brake drum twisted an angle, the greater the braking tension, the more obvious the situation, so the general large vehicles or the use of drums Brakes, in addition to low cost, the large car and small car drum brake, the difference may be only large-scale use of pneumatic assistance, and small cars with vacuum assisted to help the brakes. Drum brake manufacturing technology is low, but also the first for the braking system, so the manufacturing cost is lower than the disc brakes. As the drum brake brake to seal the film in the brake drum, causing the brake to make the film after the debris can not be dispersed, affecting the brake drum and to make the film contact surface and affect the braking performance. As the brake system is not sealed, so the brake wear of the fines will not be deposited on the brakes, disc brakes centrifugal force can be all water, dust and other pollution out to stop to maintain a certain clean. In addition, because the disc brake parts are independent, it is easier to repair than drum brakes Disc brakes in addition to the higher cost, are basically better than drum brakes, disc brakes, also known as disc brakes, as the name suggests is to take its shape and named. It is controlled by the hydraulic, this brake heat fast, light weight, simple structure, easy to adjust. Especially when the high load performance is high, the braking effect is stable, and not afraid of mud water invasion, in the winter and bad road driving, disc brake drum brake is easier than in a short period of time to stop the car. Some disc brakes also open a number of small holes on the brake disc to accelerate ventilation and heat to improve the braking efficiency. In contrast, drum brakes, due to poor heat dissipation, in the braking process will gather a lot of heat. Brake shoe and drum drum under the influence of high temperature more prone to extremely complex deformation, prone to brake fade and vibration phenomenon, causing the brake efficiency. Of course, disc brakes also have their own flaws. For example, the brake and brake pipe manufacturing requirements are higher, the friction plate wear and tear larger, costly, and because the friction plate area is small, the relative friction of the work surface is also small, the required brake hydraulic high, must To be able to use the device to help the device, it can only be applied to light vehicles. The drum brake cost is relatively low, more economical. Therefore, the car designer from the economic and practical point of view, the general car with a mixed form, front wheel disc brake, rear wheel drum brake. Four-wheel car in the braking process, due to the role of inertia, the front wheel load is usually the total load of 70% -80%, so the front wheel brake force than the rear wheel. Car manufacturers in order to save costs, the use of front wheel disc brakes, rear wheel drum brake way. Four-wheel disc brake in the high-class cars, the use of front-wheel ventilation disc brake is to better heat, as the rear wheel with non-ventilated disc is also the reason for the cost. After all, ventilation-type manufacturing process to be much more complex, the price is relatively expensive. With the development of materials science and the reduction of cost, in the field of cars, disc brakes have gradually replaced the drum brake trend. Ventilation discs are made of two identical sized discs, with ventilation between them. When the brake disc with high-speed rotation of the wheel, it will be the same as the pump, the hot air between the two discs to discharge, to achieve the purpose of heat.
ADD:Wei Four Road, Weizhuang industrial Park, Changyuan
District, Xinxiang City, Henan Province, China
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