Both the drum and the disc brake technology were born a […]
Both the drum and the disc brake technology were born at the end of the 19th century. Strictly speaking, the drum brakes are several years earlier than the disc type, but the two brakes work differently.
The drum brake is simply composed of a brake oil pump, a piston, drum brake a brake pad and a tympanic chamber. When braking, the high-pressure brake oil of the brake cylinder pushes the piston to apply force to the two half-moon brake shoes. The inner wall of the drum is pressed, and the brake drum is prevented from rotating by friction to achieve the braking effect.
The working principle can be described as a cup with a picture. The brake drum is like a cup. When you put five fingers into the rotating cup, the finger is the brake pad. As long as you point the five to the outer one and rub the inner wall of the cup, the cup will stop rotating.
Disc brakes are powered by air pressure. The main components are brake discs, air chambers, brake calipers, and air pipes. The brake disc is made of cast iron or alloy steel and is fixed to the wheel and rotates with the wheel.
The air chamber is fixed on the bottom plate of the brake, and the two friction plates on the brake caliper are respectively mounted on the two sides of the brake disk, and the piston of the air chamber is pressurized by the air pipe to push the friction plate to the brake disk. Friction occurs as if the plate in rotation is clamped with pliers to achieve the effect of decelerating the brakes.