Working principle and function of brake drum
TIME：2020.01.07
The working principle and function of the brake drum, the brake is completed by the intense friction between the brake pad and the brake hub, and two semi-circular brake pads are installed in the wheel hub, the brake pad is pushed by the lever principle to make the brake pad contact with the inner surface of the wheel hub and cause friction. Brake Drum work principle, is to rely on the friction between the two, friction to reduce the speed of the wheel rotation braking device. When you press the Brake Pedal, the foot force will cause the brake master pump will be pushed forward and in the oil pressure. The brake drum has the characteristics of quick heat dissipation, light weight, quick braking and convenient adjustment. Especially high load high temperature performance, stable braking effect, less affected by external environmental factors, in cold weather and extreme driving conditions, easier to stop the car in a short time. Because the drum brake pad is sealed in the Brake Drum, the brake pad can not be broken after wear, which affects the contact surface between the brake drum and the brake pad and affects the brake performance. The brake drum has an automatic brake tightening function, allowing the brake system to use lower oil pressure or a brake drum with a much smaller diameter than the brake disc. The handbrake mechanism is easy to install. Some models with disc brakes on the rear wheels have a drum brake with a hand brake in the center of the disc. The inner surface of the drum brake is where the brake moment is generated by the brake device. With the same brake Torque, the brake drum diameter of the drum brake can be much smaller than that of the disc brake. The self-braking function of the brake drum: the drum-type brake has a good self-braking function, because the brake comes to make the pieces stretch outwards, the wheel rotates with the brake drum stretched out at an angle that is not so large that you can easily see that the brake is pulling the brake force out of the brake pad, the more obvious the situation is, therefore, generally large vehicles or the use of drum brake, in addition to lower costs, large vehicles and small cars drum brake, the difference may only have large pneumatic AIDS, and small cars to assist with vacuum brake. The role of the drum brake simple, drum brake is the use of brake drum inside the static brake pad, to friction with the wheel rotation of the brake drum, in order to generate friction to reduce the speed of the wheel rotation brake device. When you press the Brake Pedal, the foot force will cause the piston in the brake master pump to push the brake fluid forward and create pressure in the oil path. The pressure is transmitted through brake fluid to the brake pump piston of each wheel, which pushes the brake pad outward, causing friction between the pad and the inner surface of the brake drum, and generating enough friction to slow down the speed of the wheel, for braking purposes. Advantages of DRUM BRAKES: 1. There are automatic brakes that allow the brake system to use lower oil pressure or use brake drums that are much smaller in diameter than the brake discs. 2. The handbrake mechanism is easy to install. Some models with disc brakes on the rear wheels have a drum brake with a hand brake in the center of the disc. 3. The processing and composition of the parts are relatively simple, and the manufacturing cost is relatively low. DISADVANTAGES OF DRUM BRAKES: 1. Drum brake drum in the heat after the diameter will increase, and cause the brake pedal under the stroke increased, prone to brake reaction is not as expected. Therefore, when driving a vehicle with drum brakes, we should try to avoid continuous brake pad due to high temperature and thermal degradation phenomenon. 2. Brake system response is slower, brake pedal force is less easy to control, not conducive to high-frequency braking action. 3. Complex components, brake clearance must be adjusted, making maintenance difficult. In order to increase the stability of braking at high speed, disc brake has become the mainstream of current braking system because of the increase of vehicle performance and speed. Because the disc brake disc is exposed to the air, the disc brake has excellent heat dissipation. When the vehicle brake sharply or repeatedly in a short period of time at high speed, the brake performance is not easy to decline, can let the vehicle obtain the better brake effect, enhances the vehicle's security. And because of the rapid response of the brake disc, the ability to do high-frequency braking action, so many models use disc brake with ABS and VSC, TCS and other systems to meet the needs of such systems need to move quickly.
