The composition of the three-point seat belt
It is the structure of the most widely used three-point seat belt. Among the various seat belts, it is the seat belt form that combines practicality, comfort and occupant restraint quite well.
ELR three-point seat belt
An ELR three-point seat belt is a three-point seat belt with an ELR retractor. This type of retractor, called an Emergency Locking Retractor (ELR), usually allows the belt to be pulled out freely. It is equipped with a shock-sensing device that locks the seat belts in the event of a crash or emergency braking. Generally, the amount of impact is sensed through the deceleration of the vehicle, and the amount of impact is sensed through the pull-out speed of the webbing. The combination of the two methods has become the mainstream.
ALR three-point seat belt
ALR three-point seat belts are three-point seat belts equipped with ALR retractors. This type of retractor is called Automatic Locking Retractor (ALR). Belt retractor. ELR/ALR used in combination with ELR has become mainstream. The ALR works when the seat belt is fully extended, and the ELR works when the seat belt is fully retracted. This method is mainly used for the fixing of child seats.
Seat belts with pretensioners and force limiters
Many mid- to high-end cars are now equipped with seat belts with pretensioners and force limiters. The pre-tensioner is used to eliminate the excess tension margin of the seat belt as much as possible to prevent the occupant from being injured by the exploding airbag. The force limiter reduces the tension of the seat belt after the peak force has passed, so as to reduce the force on the occupant's ribs and shoulders.