What Are the Four Beams and Six Pillars of a Car?
2 Answers
The four beams and six pillars of a car refer to the skeletal structure of the vehicle. The four beams include the front anti-collision beam, rear anti-collision beam, floor beam, and upper side beam. The anti-collision beams primarily function to reduce repair costs during low to medium-speed collisions and can mitigate passenger injuries to some extent. The six pillars refer to the A, B, and C pillars (one set on each side). Simply put, the A, B, and C pillars are the rigid connection points between the cockpit and the vehicle roof, directly influencing the safety of the passenger compartment. Additional Information: Anti-collision beams are devices designed to absorb collision energy and minimize damage during impacts. They consist of a main beam, an energy-absorbing box, and mounting plates that connect to the car. Both the main beam and the energy-absorbing box effectively absorb collision energy during low-speed impacts, reducing the force transmitted to the vehicle's longitudinal beams, thereby protecting the car. The front and rear anti-collision beams are the first components to bear the impact force during a collision. A key concept in passive vehicle safety is that force applied at one point is distributed across the entire structure.
The four beams and six pillars are crucial parts of a car's body structure. As someone who frequently repairs cars, I’d like to share some insights: The four beams refer to the four longitudinal beams at the bottom of the car, such as the front and rear longitudinal beams on both sides. They bear the weight of the vehicle and absorb impact during collisions, protecting the chassis from falling apart. The six pillars are the vertical supports on the roof, including the A-pillars beside the windshield, B-pillars in the middle of the doors, and C-pillars near the rear windows—three on each side, totaling six. These pillars support the roof and prevent the passenger compartment from being crushed in rollover accidents. If these structures are damaged, such as by rust or bending, the car may feel unstable when driven, and repairs can be costly and time-consuming. That’s why I often remind car owners to inspect the body regularly, especially paying attention to rust prevention during rainy days. The strength of the four beams and six pillars directly affects safety test results. I’ve personally witnessed accidents where intact pillars saved lives, proving that when buying a car, you shouldn’t just focus on appearance—you must also pay attention to these hidden engineering aspects.
