What is the rear bumper underpanel of a car
The lower side panel of the rear bumper of a car (also known as the rear panel) is a metal protective structure beneath the trunk of a car. It is located in the area above the junction of the inner side of the rear bumper and the bottom plate of the trunk, and is usually made by welding multiple metal plates together.
Structure and Function
Youdaoplaceholder0 location : Hidden around the bottom of the trunk, it can only be fully exposed when the rear bumper is removed.
The function of is : it buffers the impact from the rear, protects the items inside the trunk and the vehicle structure, and at the same time prevents mud, water and debris from entering the vehicle.
Youdaoplaceholder0 Material : Made of stainless steel by stamping, with rubber protective layers covering the corners and edges, and connected to the frame through welding.
Maintenance impact
Youdaoplaceholder0 Minor damage : It can be restored through sheet metal repair and does not affect the value of the used car.
Youdaoplaceholder0 Severe damage : If cutting and replacement are required, it will undermine the structural strength of the vehicle body, leading to the depreciation of the vehicle.
The main functions of the lower panel (deflector) of the rear bumper of a car are as follows:
Aerodynamic optimization
By optimizing the aerodynamic design at the rear of the vehicle, the lift generated during high-speed driving is reduced, preventing the rear wheels from floating and enhancing driving stability.
Vehicle body protection
Made of high-strength plastic, it serves as a buffer in the event of minor collisions, reducing damage to the vehicle body. At the same time, it can absorb the impact force in a collision and reduce the harm to the occupants.
Appearance beautification
Through smooth line design, the rear styling of the vehicle becomes more aesthetically pleasing and enhances the visual grade.
Structural reinforcement
Some of the deflector plates are fixed to the bumper with screws or clips and can be disassembled and replaced for easy maintenance.
The malfunction of the rear bumper lower panel of a car usually refers to the deformation or damage of the rear panel (located at the bottom of the trunk) due to collision or uneven force. The following is the key information:
Cause of malfunction
Youdaoplaceholder0 Collision or scraping : Colliding with obstacles while driving, not paying attention to the situation behind the vehicle when reversing, etc., may all cause the rear panel to deform or break.
Youdaoplaceholder0 Uneven force distribution : Long-term overloading or abnormal force distribution may cause structural components to gradually become unstable.
Maintenance method
Youdaoplaceholder0 slightly deformed
Sheet metal repair: Restore to its original state by using a straightening machine or a puller, and then spray paint. This method will not leave obvious traces, but it is only applicable when the internal structure is not damaged.
Youdaoplaceholder0 severely deformed
If the rear panel is severely wrinkled or broken, the damaged part should be cut off and a new component welded. Such repairs may involve adjustments to the spare tire floor or frame, and the repair marks are quite obvious, which may affect the value retention.
Whether it belongs to an accident vehicle
Youdaoplaceholder0 uncut repair : Only sheet metal treatment does not count as an accident vehicle;
Youdaoplaceholder0 Cutting and replacement : If part of the rear panel needs to be removed, it falls within the category of accident vehicles and may affect the residual value of the vehicle.
It is recommended that any faults be repaired promptly upon discovery to prevent further damage to the vehicle body structure. If cutting and welding are involved, it is necessary to require the maintenance point to use anti-rust treatment and ensure the welding quality.
There are structural and functional differences between the side panels and the rear bumper:
Rear panel
Located at the rear of the vehicle, it is a body panel under the trunk, composed of multiple pieces, mainly serving to protect the trunk. The replacement of the panels usually does not cause a significant depreciation of the vehicle's value.
Rear bumper
The anti-collision device at the front and rear of the vehicle body consists of three parts: the outer panel, the cushioning material and the crossbeam. It is mainly used to absorb the impact force of the collision and ensure the safety of the vehicle body.
The positional relationship between the two: The rear panel is located beneath the trunk, and the rear bumper is situated at the front and rear of the vehicle. The rear panel can only be seen by removing the bumper.
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