The working principle of the brake drum

The working principle of the brake drum is to make the friction lining rub against the inner side of the brake drum through a hydraulic device to achieve the braking effect. The brake drum is mainly composed of brake wheel cylinder, brake shoe, brake drum, friction lining, return spring and other parts. When the brake pedal is stepped on, the piston of the brake master cylinder is pushed to move, and then pressure is generated in the oil circuit. The brake fluid transmits the pressure to the brake drum, so that the friction lining contacts the brake drum, generating friction, and slowing the vehicle Or stop. The brake drum is mostly used to brake the rear wheel and parking brake with relatively small load.

The role of the hub

The wheel hub is an important part of the car. Its main functions include: supporting the wheels, transmitting power, and providing suspension support. The hub unit is an integral device that integrates bearings, seals, sensors and other related components. It is installed on the wheel of the vehicle to support and rotate the wheel. Compared with steel wheels, alloy wheels have lighter weight, low inertial resistance, high manufacturing accuracy, and small deformation during high-speed rotation, which is beneficial to improve the straight-line driving performance of the car, reduce tire rolling resistance, and reduce fuel consumption. At the same time, the thermal conductivity of the alloy material is about three times that of steel, and it has good heat dissipation, which can play a certain role in the thermal attenuation of the vehicle's braking system, tires and braking system.

How to repair the wheel hub scratch

The repair methods of the wheel hub scratch include: 1. Wipe around the scar with paint diluent to remove dirt; 2. Use a toothpick to remove the dirt on the deeply scratched part; 3. Use the tip of a brush to coat the finishing paint, and after the paint dries, it shrinks slightly; 4. After drying for a week, apply soapy water to make the surface smooth, and apply water-resistant paper with soapy water to make the surface smooth surface; 5, it can be polished with car-specific sanding paper; 6. Wipe the wheel hub with clean linen; 7. Repair with car-specific scratch repair paint.