Why does the rear bumper develop into this system?
Looking at the cars of the 1960s and before, the rear bumper system of the car is not the case. The exposed metal anti-collision beams are very common, and the outer surrounds are also made of metal. It can be said that the rear bumper system of the car was very simple and the complexity was far less than it is now.
Because the anti-collision beam is exposed, the damage to the car body is correspondingly smaller. This system is the mainstream configuration for a long time. In places like Australia, exposed collision beams are still used in large numbers because of frequent car crashes. Some friends will also specially install exposed anti-collision beams to avoid damage to the car.
The rear bumper of the car has evolved into the current model, probably starting in the 1980s. We know that car safety is also valued from this time. For example, Volvo's three-point seat belt was popularized in the 1980s.
At that time, it was found that the exposed beams and metal enclosures were very harmful to pedestrians. Later, people gradually surrounded the exposed beams with plastic or soft materials. In the beginning, it only covered the anti-collision beam. For example, Nissan March (1983), which sold 2 million vehicles in 9 years, can still visually distinguish this part from the outside even if it is a small white car.
However, this setting has not completely solved the pedestrian safety problem because the front of the car is not flat enough. The raised anti-collision beam is good for the impact on the leg joints of pedestrians. This change can only be said to cure the symptoms.
Car front face design is beginning to usher in a new round of change
To some extent, the front face design of the car is driven by the safety of the anti-collision beam. Because the exposed metal anti-collision beam is not suitable, it can only be moved one step further, which is equivalent to the position of the outer enclosure and the anti-collision beam, and the anti-collision beam is hidden inside the outer enclosure.
By this time, the prototype of the car insurance system began to appear. The exposed metal rear bumper is gradually replaced with a plastic rear bumper to deal with pedestrians in low-speed collisions; the anti-collision beam and energy-absorbing box behind it are designed to withstand low-speed collision damage.