Brake basic knowledge

Summary:

   The brake pads are also called brake pads. In the brake system of a car, the brake pads are the most critical safety parts. All brakes are good or bad brake discs play a decisive role. Therefore, a good brake pad is a protection person for people and cars. The brake pads refer to the friction materials fixed on the brake drum or the brake disc that rotates with the wheels. The friction linings and the friction pads are subjected to external pressure to generate friction and thus achieve the purpose of vehicle deceleration.

   Composition structure:

   The brake pads are generally composed of steel plates, adhesive heat insulation layers and friction blocks. The steel plates are painted to prevent rust. The coating process uses the SMT-4 furnace temperature tracker to detect the temperature distribution of the coating process to ensure quality. The heat-insulating layer is composed of a material that does not transfer heat and is intended to be insulated. The friction block is composed of a friction material and a binder. When the brake is braked, it is pressed against the brake disc or the brake drum to generate friction, thereby achieving the purpose of braking the vehicle to slow down. Due to the friction, the friction block wears out gradually. In general, the brake pads with lower cost wear faster. After the friction material is used, it is necessary to replace the brake pads in time. Otherwise, the steel plate and the brake disc will be in direct contact with each other, eventually losing the braking effect and damaging the brake disc. In the traditional manufacturing process, the friction material used on the brake pads is a mixture of various adhesives or additives, and fibers are added to increase the strength of the friction materials and reinforce them. The final braking effect, wear resistance, temperature resistance and other properties of brake pads will depend on the relative proportions of the different components.

The composition of the brake pad raw materials is generally divided into four parts: binder, reinforcing fiber, friction modifier, and filler: The binder is one of the most important components in the friction material, which can affect the thermal decay properties of the material. Restores performance, wear and mechanical properties. Generally, there are several kinds of thermosetting, thermoplastic, rubber, and composite types. In automotive friction materials, heat-curing adhesives are generally used. Specific applications include phenolic resins, melamine resins, epoxy resins, silicone resins, and polyamide resins. Wait. The most widely used are phenolic resins and their modified resins. The purpose of the modification is to improve the high temperature performance of the resin. In order to improve the high-temperature performance of the adhesive, polyimide resins have been used in advanced automotive friction materials. However, the current cost of such resins is too high and popularity is not easy.

   Reinforcing fiber is a friction material, and the main friction element also acts as a reinforcing base. For example, asbestos and other mineral fibers are used for traditional materials, while steel fibers are used for semi-metallic automotive friction materials, and a small amount of copper fibers and a small amount of mineral fibers are added at the same time. In recent years, there have been more and more types of reinforcing fibers. In order to improve the stability of friction materials at various temperature stages and the affinity of fibers and binders, a variety of fibers are often used in practical applications.