What is the car fender and what is its function?
The car fender is the arc-shaped structural area above the wheels of the vehicle (including the exterior decorative wheel arch and the internal lining), with the core function being to prevent splashing substances, protect the chassis components, reduce noise and optimize aerodynamics.
Definition of the area
Location: Positioned directly above the four wheels, it is the arc-shaped space connecting the fenders and the side panels of the vehicle body.
Composition: It consists of the externally visible decorative parts (often called "wheel arches" or "wheel arch covers") and the internally invisible engineering plastic/rubber lining (wheel arch liner).
Differentiation: Strictly speaking, "wheel arch" refers to the arched space formed by the vehicle body sheet metal, while in daily language, it is often used interchangeably with the protective plastic cover covering it.
Core functions
Splash prevention: Physically blocking the mud, gravel, and other debris kicked up by the tires, preventing scratches on the paint, chassis, and suspension components.
Anti-rust and anti-corrosion: Preventing rainwater and mud from entering the engine compartment or the gaps in the chassis, reducing the risk of metal corrosion.
Noise reduction and silence: Utilizing special materials to absorb the noise from tire rolling, reducing the interior noise by approximately 3-5 decibels.
Aerodynamic optimization: Guiding the airflow around the wheels, reducing turbulence and drag, and for some models, this helps improve fuel economy.
Sport interference reserve: Ensuring that the tires do not rub against the vehicle body during maximum movement and steering.
When the "wheel arch" (fender liner/ventilator) of a car is damaged, it is necessary to first determine whether it is a plastic liner tear and detachment or a metal wheel arch deformation and rusting. The former can often be fixed by reattaching the clips or replacing the liner, while the latter involves sheet metal repair or cutting and welding. If the severe deformation affects the tire clearance, it must be dealt with to prevent friction-induced tire blowout.
Core judgment and handling plan
Plastic liner damage/tear-off: If only the fixing clips are broken or the plastic plate is torn, and the metal body is not damaged, a universal clip can be used for reattachment; for large-scale damage, a new liner can be replaced (cost is low, about several tens to hundreds of yuan).
Minor scratch/indentation on the metal wheel arch: Surface paint peeling requires sanding for rust prevention and then repainting; minor indentations can be attempted to be repaired by sheet metal shaping, without cutting.
Severe deformation/cracking of the metal wheel arch: If the deformation causes friction between the tires and the vehicle body, or interference with the suspension or structural cracking, it must be handled by sheet metal correction, cutting and welding, or overall replacement at a professional repair shop. Do not drive with a faulty vehicle.
Insurance claim
If it is a single-vehicle accident (such as scraping the shoulder of the road) and the vehicle has purchased a vehicle damage insurance, it can be reported to the insurance company for damage assessment and repair; for minor cases, it is more cost-effective to bear the cost yourself (plastic liner replacement usually costs within a few hundred yuan).
Notes for Attention
Do not confuse the concepts: What you are asking about is "wheelswell" (the body panel covering), not "wheel hub" (the metal part at the center of the wheel). The repair techniques for the two are completely different. Do not follow the wheel hub deformation solution.
Key to rust prevention: Once the metal wheelswell is damaged and the iron sheet is exposed, it is very prone to rust spreading. Please complete the rust prevention treatment within 3 days.
Avoid DIY overcorrection: Metal structural components must not be welded or forcibly struck for correction by oneself. This may damage the strength parameters of the vehicle body and require professional equipment for inspection.
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