Knowledge of seat belts

idealseat beltThe process of action is: First of all, tighten in time, and "press" people at the first moment of the accident without hesitation.Seatsuperior. Then, relax moderately. When the peak of the impact force has passed, or the person can be protected by the airbag, the seat belt is properly relaxed. Avoid injury to the ribs due to excessive tension. The most advanced seat belts are equipped with a pre-tensioning device and a tension limiter. Let's take a look at the functional principles of the two.
1. Seat belt pre-tightening device When an accident occurs, the person is forward and the seat is backward. If the seat belt is too loose at this time. The consequence is likely to be: the occupant slips out from under the seat belt; or, the person has touched the airbag, and the seat belt cannot be tightened in time due to the excessive tightening margin, that is, it has failed to eat as early as hoped. Instead of losing part of the momentum, all the burden is handed over to the airbag. Both of these conditions may cause serious injury to the occupants. But the problem is that the seat belt is properly installed. Where does the loosening room come from? One is because the clothes of the occupants themselves have a certain thickness, and there is also some room for looseness in the seat belt device. This room cannot be eliminated, but in the event of an accident, it should be eliminated as much as possible. How to do? For this reason, this kind of seat belt pre-tensioning device appears, which is responsible for providing an instant-tight seat belt. Its action process is: first a probe is responsible for collecting crash information, and then it releases an electric pulse, which is transmitted to the gas generator to detonate the gas. The gas produced by the explosion expands rapidly in the pipe and presses against the so-called ball chain, causing the ball to move forward in the pipe, driving the spiny gourd to rotate. The pawl disc is integrated with the uranium, and the seat belt is wound on the shaft. To put it simply, the gas pressure makes the ball move, the ball drives the pawl to rotate, and the pawl drives the shaft to rotate-instantaneously realizes the pre-tightening function of the seat belt. The whole process from sensing the accident to completing the seat belt pre-tightening lasts only a few thousandths of a second. At the end of the pipe is a cavity, used to hold the rolling ball.
2. After the accident of the seat belt tension limiter, the seat belt has been tightened under the action of the pre-tightening device. However, we hope that after the peak force has passed, the tension of the seat belt will be immediately reduced to reduce the force on the occupants. This special task is completed by the seat belt tension limiter: on the seat belt device, there is an as before The pre-tightening device is wound with a safety belt underneath. Inside the shaft core is a steel torsion bar. When the load reaches a predetermined condition, the torsion bar begins to twist, which relaxes the seat belt to a certain extent and realizes the tension limiting function of the seat belt.
With the joint action of the seat belt pre-tensioning device and the seat belt tension limiter, the protection capability of the seat belt has almost reached the ideal state. The so-called see the spirit in the subtle, advanced seat belts can indeed provide reliable safety protection for the occupants.