AIRBAG COMPRISING A VARIABLE-SURFACE VENTILATION AREA

The invention relates to an airbag which is equipped with a variable ventilation area. The ventilation area is formed by an element which is fixed to the area of the inflatable bag that is disposed next to a gas discharge outlet, such that the surface area of the gas outlet can vary during impact in a directly proportional manner in relation to the pressure inside the bag. The above-mentioned ventilation area-forming element consists of one or more parts which are sufficiently flexible in order to present different gas discharge surface areas, and the element may or may not comprise a membrane for sealing said gas discharge outlet. The aforementioned ventilation area makes it possible for the pressure inside the airbag to adapt to the passenger, the impact or both.