What's the back bumper of a car
A rear door bumper is a safety device installed at the rear of a vehicle, usually under the rear of the vehicle. It is made of plastic or metal materials, and its main function is to absorb energy in the event of a collision of the vehicle and reduce the injury to the passengers in the vehicle .
Material and structure
Car rear door bumpers are usually made of plastic or metal materials. Plastic bumpers are widely used because of their light weight, corrosion resistance and good energy absorption characteristics. Metal bumpers are used in some high-performance or commercial vehicles for their high strength and impact resistance.
Function and importance
The core function of the rear bumper is to absorb and slow down the external impact force, protect the body and passenger safety.
The main roles of car rear door bumpers include protecting the vehicle, absorbing collision energy, beautifying the appearance and assisting driving operation .
Protecting the safety of vehicles and occupants : The rear door bumper can prevent the collision between the rear door and other objects in the process of driving, so as to protect the integrity of the rear door of the vehicle. In the event of a rear-end accident, the rear bumper can absorb part of the collision energy, reducing the injury to the occupants .
absorb collision energy : in the event of a rear-end collision accident, the rear door bumper can absorb part of the collision energy, reduce the damage of the internal parts of the vehicle, reduce maintenance costs .
Beautify the appearance : The design of the rear door bumper is usually coordinated with the style of the vehicle, not only to protect the vehicle, but also to improve the overall beauty of the vehicle, so that the vehicle looks more complete and beautiful from the rear .
auxiliary driving operation : some models of rear door bumper may be installed with reversing radar or cameras to assist the driver to reverse operation, improve driving safety .
Reasons for a car's rear door bumper failure can include the following :
design defects : some models of bumper design has its own structural problems, such as unreasonable shape design, insufficient wall thickness, which may lead to bumper cracking in the normal use .
manufacturing process problems : there may be defects in the manufacturing process, such as internal stress during injection molding, uniformity of the material, etc., which may cause the bumper to crack during use .
assembly process problems : tolerance caused by manufacturing accumulated to the assembly, forced through the clamp or screw assembly, forming a strong internal stress .
temperature change : Extreme temperature changes may lead to changes in the physical properties of plastic bumpers, resulting in cracking .
material aging : the bumper used for a long time, the material may become brittle, easy to crack .
Fixes include :
spray painting : If the bumper is only damaged by the surface paint, it can be spray-painted to repair .
plastic welding gun repair : the crack is heated and welded with the plastic welding gun, the plastic welding rod is fused on the crack, and the gap is repaired .
sandpaper polishing : for shallow cracks, you can sand the cracks with water sandpaper, and then polish with coarse wax and mirror wax .
stainless steel repair mesh : cut the appropriate stainless steel repair mesh to fill the cracks, fix it with electric soldering iron and scissors, fill the repair strip and atomic ash, and then spray paint .
Replace the new bumper : if the bumper has a large area of cracks, even if it can be repaired, the buffer effect is not very good, it is recommended to replace the new bumper .
Preventive measures and routine maintenance :
Regular inspection : Check the status of the bumper regularly to detect and deal with potential problems in a timely manner.
Avoid extreme temperature changes : try to avoid exposing the vehicle to extreme temperature environment for a long time to reduce cracking caused by physical property changes.
avoid impact : Pay attention to avoid unnecessary impact in the process of driving, reduce the risk of bumper damage.
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