The door provides a passage for the driver and passengers to enter and exit the vehicle, and isolates the interference outside the vehicle, reduces side impact to a certain extent, and protects the occupants. The beauty of the car is also related to the shape of the doors. 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 use functions. The anti-collision performance is particularly important, because when the vehicle has a side collision, the buffer distance is very short, and it is easy to injure the occupants of the vehicle.
A good car door will have at least two anti-collision beams, and the weight of the anti-collision beam is heavier, that is to say, a good car door is indeed heavier. But that’s not to say that the heavier the door, the better. In today’s new cars, if the safety performance can be guaranteed, designers will try to reduce the weight of the vehicle including the door (such as using new materials) to reduce power consumption. According to the number of doors, cars can be divided into two-door, three-door, four-door, five-door cars and so on. Most of the cars used for official purposes are four doors, the cars used for family use have both four doors, three doors and five doors (the rear door is a lift-up type), while sports cars are mostly two doors.