One or three-point seat belts
Three-point seat belts can tie passengers' chest and front thighs. In mini-cars, the serious injury of front passengers can be reduced by 44% (compared with not wearing seat belts), the serious injury of rear passengers can be reduced by 44%, and the serious injury of rear passengers can be reduced by 15% (compared with horizontal seat belts). More importantly, if the front passenger uses a three-point seat belt instead of a horizontal seat belt, the injury to the passenger's abdomen and head will be reduced by 52% and 47% respectively.
Two. Four-point seat belt
A typical four-point seat belt consists of two vertical seat belts, which can be fastened to the chest of passengers in the car and buckled with the horizontal seat belt at the bottom. Four-point seat belts have been used in racing cars for many years, and now some manufacturers, such as Volvo, are trying to apply them to mini cars. The starting point of the design is that when the car rolls over, the four-point seat belt can disperse the impact force more evenly, and at the same time, the occupant can be firmly fixed on the seat.
Step 3 Pre-tighten the seat belt
Seat belt pretensioner is also called seat belt pretensioner. The characteristic of this seat belt is that at the moment when the car collides, when the occupant has not moved forward, it will tighten the webbing first, immediately tie the occupant tightly to the seat, and then lock the webbing to prevent the occupant from leaning forward, thus effectively protecting the safety of the occupant. The retractor, which plays a major role in the pre-tightening of seat belts, is different from ordinary seat belts. In addition to the function of ordinary retractor to tighten the webbing, it can also strengthen the binding force on passengers at about 0. 1 s when the vehicle speed changes sharply, so it also has a control device and a pre-tightening device.
Four. Inflatable seat belt
Usually, when a vehicle collides, the seat belt will tightly tie the driver and passengers to the seat. However, due to the amazing impact, passengers are often strangled. In order to avoid this situation and minimize the damage to passengers in the event of a collision, Ford R&d department decided to combine seat belts with airbags. In the original seat belt design, airbags were reserved and induction devices similar to airbags were used. When the seat belt is tightened, the airbag will also expand at the same time, creating an elastic space, so that the injury to the occupants when the seat belt is tightened is not so serious.
The above is the knowledge about seat belts. Bian Xiao reminded car owners that the first thing to do when driving is to fasten your seat belt.