The car control arm is an important part that connects the vehicle suspension system and the wheels, and its role mainly has the following aspects:

1.Wheel support: The control arm supports the wheel by connecting the wheel and the suspension system. It carries the weight of the wheel and the power transfer of the suspension system, keeping the wheel in the correct position and Angle, and ensuring the stability of the wheel contact with the ground.

2. Control wheel movement: The design and structure of the control arm can control the trajectory and Angle of the wheel movement. By adjusting the length and Angle of the control arm, the up and down movement of the wheel and the steering Angle can be affected to realize the suspension adjustment and steering control of the vehicle.

3.Shock and vibration mitigation: The control arm can absorb and mitigate the shock and vibration of the road surface by connecting the wheel and suspension system. Through elastic materials and structural design, it reduces shock and vibration transmission to the body and cab of the vehicle, improves ride comfort and suspension stability.

4. Provide suspension adjustment: The design and adjustment of the control arm can provide adjustment function of the suspension system. By adjusting the length and Angle of the control arm, the stiffness and travel of the suspension system can be changed to adapt to different road conditions and driving needs, and the suspension performance and handling performance of the vehicle can be improved.