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Gucheng Industrial Park, Gucheng Town, Xingtai City, Hebei Province
Brake Drum 1414153
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- Product Description
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Structure and Classification
Monolithic casting type: manufactured as a single piece from high‑strength gray cast iron or alloy cast iron containing chromium. It features a simple structure, ease of machining, and a large thermal capacity, but it is relatively heavy and is commonly used in medium‑ and heavy‑duty vehicles.
Steel–cast iron composite type: This design integrates a stamped steel drum hub with a cast‑iron drum rim, resulting in a lighter weight and commonly used in passenger cars and light vehicles.
Light-alloy–cast-iron composite: The main body is made of a light alloy, such as aluminum alloy, with an internal cast-iron liner. This design not only reduces weight but also provides excellent heat dissipation, making it widely used in passenger cars.
Materials and Manufacturing
Brake drums are typically manufactured from gray cast iron, such as grades HT200 and HT300. Their matrix microstructure is predominantly pearlitic, with minor amounts of ferrite and cementite. The graphite is mainly in the A‑grade morphology, appearing as long, flaky shapes. Casting is the most common manufacturing process; to enhance performance, alloying elements like copper (Cu) and chromium (Cr) are often added.
Working principle
When the driver presses the brake pedal, the hydraulic pressure in the wheel cylinder rises, pushing the piston outward. The piston then drives the brake shoes on both sides to swing outward about their pivot points, bringing the friction linings on the shoes progressively closer to and into firm contact with the inner surface of the rotating brake drum, thereby generating frictional force. This frictional force exerts a braking torque opposite to the direction of rotation, slowing down the brake drum and, in turn, decelerating or stopping the wheel. When the brake pedal is released, the wheel cylinder piston returns to its original position, and the brake shoes retract inward under the action of the return springs, separating the friction linings from the inner surface of the brake drum and releasing the brake.
Features
When delivering the same braking torque, it features a smaller-diameter brake disc compared to conventional disc brakes, making it well suited for large trucks and buses—vehicles with limited wheel‑hub space that require exceptionally high braking torque. It boasts a simple structure, low manufacturing costs, and easy integration of a hand‑brake mechanism. Additionally, it provides automatic self‑energizing, enabling superior braking performance even at lower hydraulic pressures or with smaller brake drums.
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We have more than 15 years of R&D, production and sales experience in brake drum manufacturing.
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Address: Gucheng Industrial Park, Gucheng Town, Xingtai City, Hebei Province
