The function of the car's rear bumper on the vehicle body
The rear bumper of a car is mainly a device designed to protect the vehicle body and the occupants' safety. It also takes into account aesthetics and aerodynamic design. It is not merely a decorative piece but an important component of the vehicle's passive safety system.
How to protect the vehicle body and occupants
Absorbing collision energy: In cases of rear-end collisions or low-speed collisions, the bumper uses the structure of the outer panel, buffer materials, and crossbeams to absorb and disperse the impact force, reducing deformation of the vehicle body and damage to internal components.
Protecting pedestrians' safety: Modern designs add buffer blocks at the bottom of the bumper, which can reduce the impact on pedestrians' legs in case of an accidental collision, meeting pedestrian protection regulations.
Protecting the rear of the vehicle: During daily driving or parking, it prevents the rear from directly scraping against other objects, reducing maintenance costs.
What impact does it have on the vehicle's appearance?
Decorating and beautifying: The design style of the bumper is coordinated with the entire vehicle, and the color and shape can enhance the overall appearance of the vehicle, making the rear look more complete.
Optimizing aerodynamics: A reasonable design can reduce the air resistance at the bottom of the vehicle, improving driving stability and fuel economy.
What are the typical structures inside?
Three parts: The rear bumper assembly is usually composed of an outer panel, buffer materials, and crossbeams.
Material selection: The outer panel and buffer materials often use lightweight plastics (such as polyester and polypropylene), which have toughness and impact resistance; the crossbeams are mostly made from cold-rolled steel plates and are used to provide structural support.
Function integration: Many models' rear bumpers also integrate reverse radar, cameras, or towing hook installation points, facilitating driving assistance and outdoor rescue.
The "faults" of the rear bumper usually manifest as: loosening, warping, misalignment, cracks, or paint cracking. The reasons are mostly: aging or breaking of the fixing clips, loosening of the bolts, external force collision, and long-term thermal expansion and contraction and material aging.
You can first check by yourself following these steps, and then decide whether to repair it yourself or send it to a repair shop.
First check: Determine the type of fault
Loose or abnormal sound: Lightly push the joints on both sides and at the bottom of the bumper to see if there is any obvious shaking. Common causes are broken fixing clips or loose bolts.
Warping or misalignment: Observe whether the edges of the bumper are aligned with the vehicle body. It could be due to a loose clip or improper installation, or deformation caused by a minor collision.
Cracks or paint cracking: Check the depth of the cracks. Surface fine cracks are mostly caused by temperature differences or aging, while deep cracks are usually caused by external impact.
Treatment plan: Choose based on the degree of damage
Light loosening or bolt issues: If it's just a loose bolt, use a screwdriver or wrench to tighten it; if the clip is broken, you can purchase the same model clip and replace it yourself. If it's an emergency, use a cable tie as a temporary fix.
Clip aging or misalignment: Remove the inner trim of the rear lights or the inner lining of the trunk compartment to check if the hidden clips are broken, and replace them with the original factory specifications.
Fine cracks or slight warping: You can use special plastic repair glue or bumper repair agent to handle it, and then polish and sand to make it almost invisible.
Deep cracks, deformation, or bracket fractures: Don't try to fix it yourself. Contact a reputable repair shop or authorized service center as soon as possible. Weld what needs to be welded and replace what needs to be replaced.
If the cracks are deep, extensive, or have affected the lights, radar, etc., continue driving may cause the damage to expand. It is recommended to send it for repair directly.
Prevention tips
Washing: Don't use a high-pressure water gun to directly spray the joint of the bumper. Use a neutral cleaning agent and a soft brush for a safer method.
Parking: Try not to park too close to the curb, pillars, or other vehicles to reduce the risk of scraping.
Maintenance: Regularly check the fixation of the bumper to avoid long-term exposure to sunlight or contact with bird droppings and other corrosive substances.
If you want to know more, keep reading the other articles on this site!
Please call us if you need such products.
Zhuo Meng Shanghai Auto Co., Ltd. is committed to selling MG&MAXUS auto parts welcome to buy.
