Cast iron brake Drum for Semi-trailer: Cast iron
The scientific name of the brake hub is the brake drum, which is the main component of the drum brake system. The friction between the inner surface of the brake drum and the brake pads during the braking function. The brake drum is a cast iron piece shaped like a tambourine, which is fixed to the tire and rotates at the same speed.
Emergency stop brake,refuse to shake, high stability coefficient. Bearing capacity is strong. Good heat dissipation performance. High coefficient of friction. Adaptive telling motion. Shorten braking distance. High temperature resistance, long life. Safe performance in rainy days. Anti-corrosion anti-wear.
The brake drum is an important component of the drum brake system. The inner surface of the brake drum of the drum brake is where the braking device generates a braking torque. With the same braking torque, the diameter of the brake drum of a drum brake device can be much smaller than that of a disc brake. Therefore, in order to obtain a powerful braking force, a large vehicle used for loading can only install a drum brake in a limited space of a rim. Drum brake systems are typically installed on the rear wheels of large vehicles.
The brake drum is improperly designed and will change easily when heated; the brake drum is not balanced and mechanical deformation will occur, which will cause poor contact between the shoe and the drum, resulting in increased pedal force and stroke; When it is large, it may cause self-locking and generate vibration and noise. Therefore, the brake drum should have sufficient wall thickness, and cast circumferential or axial stiffeners on the outer surface near the opening to improve strength. These stiffeners also play a role of heat dissipation, which can reduce the temperature of the friction surface, shorten the brake cooling time, and increase the energy capacity by 35% to 40%.
The working surface of the brake drum is generally finished after being assembled with the wheel hub by positioning the bearing holes. Mini cars require roundness and concentricity tolerances of the working surface ≤ 0.03mm, radial runout ≤ 0.05mm, and static imbalance ≤ 1.5N · cm.