When a car collides with an obstacle, it is called a primary collision. When the occupant collides with an interior component of the car, it is called a secondary collision. The airbag quickly opens a gas-filled chamber after the primary collision and before the secondary collision. The air cushion allows the occupants to "plop on the air cushion" when moving due to inertia, thereby mitigating the impact on the occupants and absorbing the collision energy, thereby reducing the degree of injury to the occupants.
Explanation of the terminology of front head airbags
Head airbags are also called side curtain airbags. They pop up to cover the windows during a collision, blocking the heads of front seat passengers from directly hitting nearby hard parts. , buffer the lateral displacement inertia of the head and protect the safety of the cervical spine and head. The front head airbags are usually located on the steel beams on both sides of the windshield (inside). It should be noted that only when airbags are used in conjunction with seat belts can passengers get the best protection in a major accident.
Curtain air bags (CAB) are used to protect the heads of vehicle occupants in the event of a side collision. The CAB component assembly is composed of an air bag, air bag wrapping cloth, gas generator, gas generator bracket and conduit. When the car encounters a side collision and the conditions for the airbag to deploy are reached, the CAB module is designed to deploy at the top of the occupant's head. The air belt inside the module expands due to internal pressure. The air belt expands and inflates at a fixed position to protect the occupant's head. Part
Principles of Airbag Chemistry
Car airbags contain substances such as sodium azide (NaN3) or ammonium nitrate (NH4NO3). When a car is hit hard at high speed, these substances will rapidly decompose and produce a large amount of gas, which fills the airbags.
As a passive safety device, the protective effect of airbags has been widely recognized. The first patent on airbags began in 1958. In the 1970s, manufacturers began to develop airbags that could reduce the severity of injuries to occupants in collision accidents; in the 1980s, automobile manufacturers began to gradually install airbags; in the 1990s, the installation volume of airbags increased sharply; and in the new century From now on, cars are generally equipped with airbags. Since the introduction of airbags, many lives have been saved. Research shows that when a car equipped with an air bag device encounters a frontal collision, the driver's mortality rate is reduced by 30% for large cars, 11% for medium-sized cars, and 20% for small cars. Explanation of terms for front head airbags Chemistry principles of airbags @2019