How does Brake Shoe Assembly improve strength, wear resistance and compatibility with brake drums?

Brake Shoe Assembly is an important part of the vehicle braking system, and its performance directly affects the vehicle's braking effect, safety and comfort. Improving brake shoe strength, wear resistance and compatibility with brake drums are key factors in ensuring efficient operation of the brake system.

The strength of a brake shoe primarily relates to its stability when withstanding braking force, friction and heat. Improving the strength of brake shoes can not only improve braking safety, but also extend the service life of the braking system. The main methods to improve brake shoe strength include:
The supporting part of the brake shoe (such as the base plate) is usually made of steel or aluminum alloy materials. The use of high-strength alloy materials can effectively improve the deformation resistance and load-bearing capacity of brake shoes.
Composite materials: In recent years, the use of metal matrix composites (MMC) and ceramic composites, combining the strength of metal and the heat resistance of ceramics, can significantly improve the strength and high temperature resistance of brake shoes.
By designing reinforced ribs on the brake shoe support structure (such as the bottom plate), the stress generated during the braking process can be effectively dispersed and the overall strength can be improved.
Surface hardening of the supporting parts of brake shoes, such as shot peening, nitriding, etc., can increase their resistance to wear and fatigue.
During the manufacturing process, precise processing technology ensures a uniform structure of the brake shoe and avoids stress concentration within the material. By strictly controlling parameters such as temperature and pressure during production, the strength of brake shoes can be effectively improved.
The wear resistance of brake shoes directly affects the life and braking effect of the brake system. Friction between the friction material and the brake drum causes wear on the brake shoes, so improving wear resistance is crucial. The main measures to improve the wear resistance of brake shoes include:
Traditional brake shoes use asbestos material, but asbestos is gradually being phased out due to its health hazards. Modern brake shoes usually use non-asbestos friction materials, such as organic friction materials, metal friction materials, ceramic friction materials, etc. These materials are not only environmentally friendly, but also have good wear resistance and friction stability.
Adding metal powder (such as copper, iron) and high-performance fibers (such as aramid fiber) can improve the hardness and wear resistance of friction materials while maintaining a good friction coefficient.

The friction coefficient of the brake shoes directly affects the braking performance, and the stability of the friction coefficient is closely related to the wear resistance. By adjusting the formula and proportion of friction materials, it is possible to ensure that brake shoes maintain a relatively stable friction coefficient under different temperature and humidity conditions and delay the wear process.
At high temperatures, friction materials undergo thermal degradation, resulting in reduced braking effectiveness and excessive wear. To improve wear resistance, high temperature resistant materials can be used, such as ceramics, graphite, copper alloys, etc. These materials can withstand higher temperatures while reducing thermal decay and extending service life.
By changing the surface roughness, texture or coating of the friction lining, the contact area with the brake drum can be increased, thereby improving friction efficiency and reducing material wear.
Coating a layer of highly wear-resistant coating (such as ceramic coating or carbon-based coating) on ​​the surface of friction materials can effectively reduce wear during friction and improve durability.
The compatibility of brake shoes and brake drums directly affects the working efficiency and braking performance of the braking system. Improving compatibility is mainly to ensure optimal friction between the brake shoes and the brake drum and avoid unnecessary wear.
The shape and size of the brake shoe and brake drum must match exactly to ensure even contact between the two. Any mismatch will cause excessive local wear on the brake shoes and may even cause brake failure.
By optimizing the curved surface design of the brake shoes, it can better fit the brake drum surface and reduce uneven wear and thermal decay caused by friction.
During braking, both the brake shoes and brake drum expand due to frictional heat. In order to avoid the negative impact of thermal expansion on braking performance, the thermal expansion coefficients of brake shoes and brake drums need to be designed to match. Using materials with good stability at high temperatures can reduce the impact of temperature changes on braking performance.
Corrosion-resistant materials: Brake shoes and brake drums are exposed to various environmental factors during use, such as water, salt, oil, etc., which may cause corrosion. Using corrosion-resistant materials, such as stainless steel, galvanized steel or corrosion-resistant coatings, can effectively improve the long-term compatibility of brake shoes and brake drums.
The friction surface between the brake shoes and the brake drum should be kept clean to prevent contaminants (such as grease, dirt, etc.) from entering the friction surface and affecting the braking effect. Therefore, dust-proof and oil-proof designs, as well as structural designs that are easy to clean and maintain, should be considered when designing.

Through these methods, the strength and wear resistance of the brake shoes can be significantly improved, and the compatibility with the brake drum can be ensured, thereby optimizing the overall performance of the brake system, extending the service life, and ensuring the safety of the vehicle.