The car door is to provide the driver and passengers with access to the vehicle, and isolate the interference outside the car, to reduce the side impact to a certain extent, and protect the occupants. The beauty of the car is also related to the shape of the door. The quality of the door is mainly reflected in the anti-collision performance of the door, the sealing performance of the door, the convenience of opening and closing the door, and of course, other indicators of the use of functions. Collision resistance is particularly important, because when the vehicle has a side impact, the buffer distance is very short, and it is easy to injure the occupants of the vehicle.
