The brake drum shall have sufficient strength, stiffness and thermal capacity to be compatible with the friction lining material and shall have a high friction factor. The brake drum can be cast or assembled. Grey cast iron is widely used in casting brake drum, which has the advantages of easy machining, wear resistance and large heat capacity. In order to prevent the brake drum from deformation under load, it is often cast rib on the outer circumference of the brake drum to strengthen the rigidity and increase the heat dissipation effect. Accurate calculation of Brake Drum Wall thickness is complicated and difficult, so it is often selected according to experience. The thickness of the brake drum of the car is 7.12mm, and that of the truck is 13.18 mm. The cylinder part of the combined brake drum can be cast out by cast iron, and the web part can be formed by stamping steel plate Or the main body is cast with aluminum alloy, with a layer of pearlite composition of gray cast iron as a working surface. The common characteristics of the combined brake drum are small mass, wear resistance of working face and high friction factor. Longyao County Xiang Yuan Auto Parts Co. , Ltd. to high-quality survival, good reputation for development, scientific management for efficiency, market-oriented, customer needs as the guide, in high standards, HIGH-QUALITY ROAD FORWARD!