Abstract: The present invention relates to an airbag intended for retaining the knees of the occupants of automotive vehicles during a collision consisting of an inflatable cushion (11), a gas generator (7) providing the gas for inflating the cushion, a diffuser tube (9) connected to the gas generator (7) which is fixed to the inflatable cushion (11) along one of its sides, a metal housing (13, 39) for supporting the airbag assembly and fixing it to the vehicle and a protective cover (15, 17, 35) in which the cushion is folded such that a part remains deployed in the Y direction. The airbag has a reduced volume, is easily integrated in the automobile structure and can be very quickly positioned in the event of a collision without the risk of it being able to deploy between the knees of the occupant.

Abstract: An airbag comprising a bag (11) that can be inflated with the gas provided by a gas generator when the vehicle experiences a collision, with a venting device (13) comprising first a first gas discharge opening (15) and a sealing member (17) thereof intended to break due to the effect of the pressure inside the inflatable bag (11), and second a part (19) with a second opening (21) of a smaller surface area than the first opening (15), which is fixed to the inside portion of the inflatable bag (11) and of the sealing member (17), acting as an airbag venting area once the sealing member (17) of the first opening (15) breaks.