What are the characteristics of drum brake pads?

Release time:

2021-06-08

The brake device generates friction between the brake pads and the drum or disc, which converts the kinetic energy of the car into heat energy for consumption. There are two common braking devices: "drum brake pads" and "disc brake pads". Their basic characteristics are as follows: 1. Drum brake pads: Install two semicircular brake pads in the wheel hub, and use the "lever principle" to push the brake pads so that the brake pads contact the inner surface of the wheel drum to generate friction. Drum brake pads have been used in automobiles for nearly a century, but due to their reliability and powerful braking force, drum brake pads are still used in many models (mainly for the rear wheels).

What are the characteristics of drum brake pads?

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Drum brake pads use hydraulic pressure to push outward the brake pads installed in the brake drum, so that the brake pads and the inner surface of the brake drum that rotates with the wheels produce a braking effect. The inner surface of the drum brake pad is the position where the braking device generates braking torque. In the case of obtaining the same braking torque, the brake drum diameter of the drum brake pad can be much smaller than that of the disc brake. Therefore, in order to obtain a strong braking force, heavy-duty large vehicles can only install drum brakes in the limited space of the rim.

Simply put, the drum brake pad is a brake device that uses the static brake pads in the brake drum to rub the brake drum to rotate with the wheels, thereby generating friction and reducing the wheel speed. When the brake pedal is depressed, the force exerted by the foot will cause the piston in the master cylinder to push the brake oil forward and generate pressure in the oil circuit.

The pressure is transmitted to the piston of the brake slave cylinder of each wheel through the brake oil. The piston of the brake slave cylinder pushes the brake pads outward, causing friction between the brake pads and the inner surface of the brake drum to generate enough The friction force to reduce the speed of the wheels, so as to achieve the purpose of braking.