How is the heat dissipation of the brake drum
In addition to various retarding devices, automotive brakes are almost all friction brakes that use the friction between the fixed components and the rotating components to produce braking torque.
At present, the friction brakes widely used in all kinds of automobiles can be divided into drum type and disc type according to the different rotating components. The difference between them is that the rotating element in the friction pair of drum brake is the brake drum, and the inner surface of its cylinder is the working surface; The rotating element in the friction pair of disc brake is a disc-like brake disc, and its two ends are the working surface; The brake drum is the friction couple of the drum brake, in addition to the strength and stiffness required as a component, it should also have as high and stable friction coefficient as possible, as well as appropriate wear resistance, heat resistance, heat dissipation and heat capacity.
Because the brake drum can provide relatively large friction braking force, but the brake drum currently generates large heat during braking, which is easy to cause excessive temperature of the friction disc and the brake drum. Long-term use will cause damage to the friction disc and the brake drum, and will affect the service life of the brake drum and the friction disc, improve the maintenance cost of the vehicle, and affect the braking performance. Cause hidden dangers.
Drum brakes are now generally used in medium and large trucks, the brake drum and brake disc model specifications are more comprehensive, and large trucks can use air pressure control. The road conditions are complicated and frequent braking can also be done through water-cooled brake drums. Drum brake system should be regularly maintained and adjusted.
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