What is the beam under the car door called?

[OIvan]

The plastic guard plate under the car door is called a side skirt. It is also referred to as a lower side beam or lower skirt. Here are the specific details: 1. Highly prone to damage: Due to its plastic material, this part is susceptible to scratches and collisions, making it extremely easy to damage. 2. Function: The side skirt functions similarly to an air dam, reducing the airflow entering the underside of the car from both sides. It has a certain spoiler effect and can significantly reduce air resistance under certain conditions. Here are some additional details: Common door accessories: 1. Door glass: Provides the driver with a certain degree of side visibility to assist in driving. 2. Door hinge: Used to support the door, ensuring smooth opening and closing. 3. Door inner handle: Generally fixed on the door trim panel, while the outer handle is fixed on the door outer panel, facilitating the closing and opening of the door. 4. Door stopper: Used to limit the maximum opening angle of the door, ensuring it stops at a certain angle for easy entry and exit of passengers.