What is the plastic frame inside the fender called?
2 Answers
Automobile fender below a piece called the bumper. Automobile fenders are made of plastic, steel, and aluminum alloy. Fenders, also known as wings, are divided into front fenders and rear fenders according to their installation positions. They are a type of cover component on motor vehicles and non-motor vehicles. Bumper composition: Plastic bumpers consist of three parts: the outer panel, buffer material, and crossbeam. The outer panel and buffer material are made of plastic, while the crossbeam is formed by stamping 1.5mm thick cold-rolled sheet metal into a U-shaped channel. The outer panel and buffer material are attached to the crossbeam, which is then bolted to the vehicle frame longitudinal beams, allowing for easy removal. The plastic used in these bumpers is primarily polyester-based or polypropylene-based, manufactured through injection molding. Bumper function: Automobile bumpers (impact beams), located in the front and rear areas of the vehicle, are designed to prevent external damage from affecting the vehicle's safety systems. They have the capability to reduce injuries to occupants during high-speed collisions and are increasingly being designed for pedestrian protection.
From my experience as a seasoned driver, the plastic frame inside the fender is commonly called the wheel arch liner or fender liner. It sits between the tire and the car body, mainly to prevent road stones, mud, and rainwater from splashing into the engine compartment or chassis, avoiding rust and damage. I’ve encountered several instances of strange noises in my car, and upon inspection, it turned out to be this part being loose or cracked. Since it’s made of lightweight plastic, it’s cheap but prone to wear and tear on bumpy roads or in cold winter temperatures. Whenever I wash my car, I always take a quick look at it. If I spot any cracks or dislodgment, I replace it immediately—it only costs a few dozen bucks. This prevents mud and water from seeping in and damaging other electrical components. Regularly checking this small part can save you a lot of money. I recommend car owners lift the fender and inspect it every six months or so, especially those who frequently drive in harsh road conditions.
