Auto Brake Disc And Brake Drum Guide
Automobile brake systems are mainly divided into disc brakes and drum brakes. Disc brakes have fast response speed, good heat dissipation and easy maintenance; drum brakes have low cost and large braking force, but high wear rate and relatively poor heat dissipation performance. The corresponding key components are brake discs and brake drums.
The brake disc is a round metal disc that is usually fixed to the wheel and rotates with the wheel. The brake drum is a drum-shaped metal component that is usually installed inside the wheel and rotates with the wheel. Unlike the brake disc, the brake drum has one or more stationary brake shoes inside.
The brake disc generates braking force by clamping the brake disc with the brake caliper; the brake drum generates braking force by friction between the brake shoe and the inner wall of the brake drum.
Brake Disc
Brake discs are divided into Solid Disc and Vented Disc according to their structure.
Solid disc is a metal disc used for braking, and has no special structure.
From the outside, vented disc has many holes on the circumference leading to the center of the circle, which are called air ducts. When the car is driving, air convection in the air ducts is used to achieve the purpose of heat dissipation, which is much better than the heat dissipation effect of solid disc.
There is also a type of brake disc that integrates HUB (wheel hub), ABS ring (anti-lock braking system ring), assembly bolts, bearing skin and other components, which is generally called Hub Disc.
This design is mostly used for larger models such as trucks to meet their higher load-bearing and braking requirements.
Working Principle
When the driver steps on the brake pedal, the braking force is transmitted to the brake caliper through the hydraulic system. The piston in the brake caliper pushes the brake pads against both sides of the brake disc. As the wheel rotates, strong friction is generated between the brake pads and the brake disc, converting the kinetic energy of the wheel into heat energy, thereby achieving vehicle deceleration or parking.
Performance Characteristics
- Good heat dissipation: The ventilated brake disc design improves heat dissipation performance and reduces thermal attenuation.
- Stable braking: The braking torque is linearly related to the piston thrust and friction coefficient of the brake cylinder, and the braking process is stable.
- Good drainage: It can remove water and impurities faster and maintain the reliability of braking performance.
Brake Drum
The brake drum is the main component of the drum brake system. It is installed on the wheel hub of the car and rotates with the wheel.
Working principle
The working principle of the brake drum is to generate a braking torque through the friction between the inner surface of the brake drum and the brake pad, thereby achieving the braking effect. When the driver steps on the brake pedal, the oil pressure pushes the brake shoe to contact the inner edge of the brake drum. The friction generated by the contact suppresses the rotation of the tire to achieve the purpose of slowing down or stopping the vehicle.
Performance characteristics:
- Strong braking force: Compared with disc brakes, drum brakes have higher braking force, especially suitable for large and heavy vehicles.
- Good durability: Due to the material and structural characteristics of the brake drum, it has good durability and can withstand higher workloads.
- Heat dissipation performance: The brake drum will generate a lot of heat during operation, but its material and structure help to dissipate heat and ensure the stability of the brake system.