The brake drum (also known as a brake pad) is the core component of a drum braking system, primarily used to generate braking force through friction when a vehicle decelerates or stops. Its specific functions and working principle are as follows:
1. Main Functions
Deceleration and Stopping: By converting the vehicle's kinetic energy into heat energy through friction with the brake pads, deceleration or stopping is achieved.
Maintaining Vehicle Stationarity: In a parking brake (handbrake) system, the brake drum can lock the wheels to prevent the vehicle from rolling.
2. Working Principle
When the brake pedal is depressed, hydraulic or mechanical force pushes the brake pads outward.
Pads Contact the Drum Inner Wall: The friction material on the brake pads comes into close contact with the rotating inner wall of the brake drum, generating friction.
Kinetic Energy Conversion: Friction reduces the wheel speed, while the heat generated by friction is dissipated through the drum body.
3. Structural Characteristics of Brake Drums
Materials: Usually made of cast iron or composite materials, resistant to high temperatures and wear. Heat dissipation design: The surface may have heat dissipation fins to help dissipate heat quickly and prevent overheating that could lead to a decrease in braking performance (heat fade).
Enclosed design: Compared to disc brakes, drum brakes are dustproof and dirt-proof, but they have poorer drainage in humid environments.
