Cấu trúc và nguyên tắc của dây an toàn xe hơi là gì?

It is a matter of course to fasten your seat belt after getting into the car. But have you ever wondered how this simple yet life-saving gadget really works? The construction and operation of a car seat belt is designed to maximize the protection of the occupants while maintaining your comfort. Let's dissect it and see why seat belts are such an important safety precaution.

1. Basic Structure of a Car Seat Belt

Car seat belts consist of several key components that work together to protect the occupants in the event of an accident. A standard seat belt system consists of the following:

(1) Webbing (Seat Belt Webbing)

- The seat belt webbing is made of high-strength polyester fabric and is designed to be durable, flexible, and wear-resistant.

- It is slightly elastic to absorb the impact in the event of a collision.

(2) Retractor Mechanism

- The retractor is a spring device that automatically adjusts the length of the seat belt as you move.

- It contains a reel with a locking device that prevents the seat belt from extending further in the event of sudden braking or impact.

(3) Buckle and striker plate

- The buckle is a locking device into which the striker plate snaps.

- It can be quickly disengaged by simply pressing the release button.

(4) Pretensioner system

- In the event of a collision, the pretensioner tightens the seat belt within milliseconds, ensuring that the occupant is firmly fixed in place.

- It works in conjunction with the airbag system to enhance protection.

(5) Load limiter

- This feature releases a certain amount of seat belt slack under extreme forces to reduce chest injuries.

- Prevents excessive pressure on the body in high-intensity collisions.

2. How car seat belts work

How car seat belts work is based on two basic safety principles:

(1) Inertia and locking mechanism: Under typical driving conditions, the retractor reel allows the seat belt to move freely, allowing for comfortable seat adjustment. However, if the vehicle decelerates suddenly (for example, in a collision), the inertia locking mechanism prevents the seat belt from moving further.

(2) Energy absorption and force distribution: In the event of an accident, seat belts transfer the forces to the strongest parts of your body, namely the shoulders, pelvis and chest. Since seat belts are moderately flexible and can absorb the impact force, they are less likely to cause serious injuries.

3. Why are seat belts important for safety?

Ejection prevention - Seat belts secure passengers in the vehicle, reducing the risk of fatal injuries.

Works with airbags - Correctly wearing seat belts ensures that airbags deploy effectively.

Impact reduction - By slowing down the movement of the body, seat belts reduce the risk of serious head and chest injuries.

One of the most basic yet effective safety features in a car is the seat belt. Due to their precise working principle and well-designed structure, they have saved countless lives. Wearing a seat belt is always recommended because safety cannot be compromised.

Wuxi Chuanghecheng Metal Technology is an enterprise that has been engaged in the research, development, manufacturing and sales of car seat belts for a long time. We have also done in-depth research on the comfort of seat belt users after wearing seat belts.