What is the black border on the upper part of the car door called?
2 Answers
The border at the lower part of a car door is the bottom of the car, which is part of the body frame and serves to protect passengers in the event of a side collision. Below is a detailed introduction: 1. Basic Introduction: A car's body is divided into cover panels and the frame. Cover panels include doors, front and rear bumpers, the engine hood, front fenders, and the trunk lid. After removing all cover panels, what remains is the body frame. 2. Body Protection: In the event of an accident, it is not the cover panels but the body frame that protects the passengers. The rocker panel (or 'bottom sill') is part of the body frame and, along with the B-pillar, absorbs most of the impact force in a side collision. During regular use, the rocker panel is also prone to scratches. If driving on rough roads, it is very easy for the rocker panel to get scratched by stones. Due to its hardness, dents caused by scratches are difficult to repair. Therefore, drivers should pay attention to protecting the bottom of the car during daily use. 3. Repair Methods: If the rocker panel has been repaired, it must be coated with anti-chip or textured coating; otherwise, it is highly susceptible to rust. The rocker panel is usually coated with a layer of textured coating at the factory, which protects it and prevents rust.
As a seasoned driver with over a decade of experience, I must say that black border on the upper part of the car door, commonly referred to as the window seal or window trim, sounds quite professional, doesn't it? Essentially, it's the thing that goes around the glass, mainly serving to prevent rainwater from seeping into the car and reducing wind noise for a quieter ride. It's usually made of rubber or plastic and tends to harden and age over time. I've experienced this myself—when driving, there was a whooshing sound, and later at the repair shop, I found out it had cracked. A quick replacement costing around a hundred bucks fixed the issue. Maintenance is simple: just wipe it clean with a damp cloth during car washes, avoiding strong acidic or alkaline cleaners to prevent accelerated aging. If you notice the window isn't rolling up smoothly or dust is getting inside the car, chances are this part is the culprit, and it's best to address it early. At high speeds, its sealing performance directly affects comfort, especially on rainy days—leaks can be a real headache.
