Truck brake drum for semi trailer：HT250,HT350,QT235
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.
The brake drum is a safety piece in the semitrailer, have a braking effect, it affords the friction between the brake linings, therefore, has high requirements on mechanical property of strength hardness and heat conduct as well.
1.if the brake drum is found to be cracked or the inner diameter has exceeded the maximum repairable size, it should be replaced.
2.When there are serious grooves and strains on the inner surface of the brake drum, they should be replaced or boring (the cylindricity deviation of the brake drum after boring should be no more than 0.075mm, and the coaxial deviation of the wheel axis of the vehicle Not more than 0.025mm, the difference between the left and right wheel brake drums is less than 1mm, and the inner diameter must not exceed the maximum allowable repair size).
3.The brake system needs to be kept dry: When the brake is wet, it is best to perform blow dry treatment at the maintenance office to restore the braking function of the brake system and blow away the sediment brought by the rainwater to reduce the damage to braking system. If this is not possible, the driver can brake at a safe speed and let the brake shoe and brake drum or brake disc friction generate heat, evaporate the moisture, and the drivers can brake several times to make it dry.
When braking, oil pressure is used to push the brake shoes to contact the inner edge of the brake drum, and the friction generated by the contact is used to suppress the rotation of the tire to achieve the purpose of braking. Generally speaking, the brake hub is like a metal drum or a small bucket that is placed on the hub, and the bottom of the bucket is rubbed against the hub of the car to stop it when braking.
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.