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About drum brakes-See below
What is drum brakes?
How drum brakes works?
What's the drum brakes advantages and disadvantages?
The principle of drum brakes:
Drum brakes have been used in automobiles for nearly a century, but due to their reliability and strong braking power, drum brakes are still deployed on many models today (mostly used on the rear wheels). Drum brakes use hydraulic pressure to push the brake pads installed in the brake drum outward, so that the brake pads rub against the inner surface of the brake drum that rotates with the wheels, thereby producing a braking effect.
The inner surface of the brake drum of the drum brake is the position where the braking device generates the braking torque. Under the condition of obtaining the same braking torque, the diameter of the brake drum of the drum brake device can be much smaller than that of the brake disc of the disc brake. Therefore, in order to obtain strong braking force for heavy-duty vehicles, drum brakes can only be installed in the limited space of the rim.
Simply put, drum brake is a brake device that uses the stationary brake pads in the brake drum to rub the brake drum that rotates with the wheel to generate friction to reduce the rotation speed of the wheel.
When you step on the brake pedal, the force of the foot will cause the piston in the brake master cylinder to push the brake fluid forward and create pressure in the oil circuit. The pressure is transmitted to the brake cylinder piston of each wheel through the brake oil, and the brake cylinder piston pushes the brake pads outward, causing friction between the brake pads and the inner surface of the brake drum, and generating enough friction to reduce the speed of the wheels, in order to achieve the purpose of braking.
Advantages of drum brakes:
1. It has the function of automatic braking, so that the brake system can use lower oil pressure, or use a brake drum with a diameter much smaller than that of the brake disc.
2. The installation of the handbrake mechanism is easy. Some models with disc brakes on the rear wheels will install a drum brake handbrake mechanism in the center of the brake disc.
3. The processing and composition of the parts are relatively simple, and the manufacturing cost is relatively low.
Disadvantages of drum brakes:
1. The diameter of the brake drum of the drum brake will increase after being heated, which will cause the stroke of the brake pedal to increase, which is prone to the situation that the brake response is not as expected. Therefore, when driving a vehicle with drum brakes, try to avoid the thermal recession of the brake pads due to high temperature caused by continuous braking.
2. The response of the brake system is slow, and the pedaling force of the brake is difficult to control, which is not conducive to high-frequency braking action.
3. There are many parts with complex structure, and the brake clearance must be adjusted, which makes maintenance difficult.