Wheel hub is an important component of a car, which directly affects the performance, safety, and comfort of the car. The application of wheel hubs is very extensive, which can be reflected in the following aspects:

1. Supporting vehicle weight: The wheel hub is an important component that connects the tire and axle, and it needs to have sufficient strength and rigidity to support the weight of the vehicle, including the weight of the vehicle itself as well as the weight of passengers and cargo.

2. Power transmission: The wheel hub transmits the power generated by the engine to the ground through contact with the tires, causing the vehicle to move. At the same time, the wheel hub also has to withstand various torques and vibrations caused by uneven road surfaces.

3. Braking system: The contact surface between the wheel hub and the brake disc is an important component of the braking system. The braking system slows down or stops the vehicle by increasing the friction between the wheel hub and the brake disc.

4. Suspension system: The connection between the wheel hub and the suspension system has a significant impact on the vehicle's handling and comfort. The wheel hub needs to work in conjunction with the suspension system to absorb impacts from the road surface and ensure the stability of vehicle operation.

5. Tire installation: There are specially designed tire installation positions on the wheel hub to ensure that the tires can be installed correctly and maintain good air pressure and grip performance.

6. Aerodynamic design: The design of the wheel hub also takes into account aerodynamic effects to reduce air resistance during driving and improve fuel economy.

7. Aesthetics and Personalization: The design and material of the wheels have a significant impact on the overall appearance of the vehicle, and consumers often choose different styles and colors of wheels according to their personal preferences to personalize their vehicles.

8. Lightweight: In the field of new energy vehicles, the lightweight design of wheel hubs is of great significance for improving battery range. Lightweight wheels can effectively reduce the overall weight of vehicles and decrease energy consumption.

9. Material Innovation: With the development of materials science, new materials such as carbon fiber composite wheels are being applied in high-end car models, which have lighter weight and higher strength.

The design and manufacturing of wheel hubs is a comprehensive project that requires consideration of knowledge in mechanics, materials science, thermodynamics, aerodynamics, and other fields.