What is the structure and working principle of drum brake?

    The brake is a component used in the braking system to create a braking force that impede the movement or movement of the vehicle. At present, the friction brake widely used by various types of automobiles can be divided into two categories: drum type and disk type according to the different rotational elements.

    The brake drum is a friction pair of drum brakes. In addition to the strength and stiffness required as a component, the friction coefficient should be as high and stable as possible, as well as the appropriate wear resistance, heat resistance, heat dissipation and heat capacity. The basic shape of the brake drum is drum type, and there is a connecting hole on the installation surface.

    The typical drum brake mainly consists of the bottom plate, brake drum, brake shoe, brake wheel cylinder (brake sub pump), return spring, positioning pin and other components. The bottom plate is fixed on the fixed position of the axle. It is fixed and fixed, with a brake shoe, a wheel cylinder, a back spring, a positioning pin, and a rotating torque under the brake. Each drum has a pair of brake shoes, with friction lining on the brake shoes. The brake drum is mounted on the wheel and is rotated along the wheel. It is made of a certain weight of cast iron and has a round drum shape.

    The drum brake makes the tire stop rotating. It uses the liquid pressure from the main cylinder to the wheel cylinder to press the brake shoe top to the brake drum. The drum is rotated with the tire. When the liquid pressure on the wheel cylinder disappears, the force of the return spring pushes the brake shoe away from the inner surface of the brake drum and returns to the original position.