초록

The invention thus makes it possible to inflate the airbag gradually during the first milliseconds of deployment of the latter.

대표청구항 ▼

[ What is claimed is:] [1.] Process allowing an airbag (1) for protecting an occupant of a motor vehicle to be inflated in a gradual manner by means of a device consisting mainly of the said airbag connected to a pyrotechnic generator (2) of gases arising at least partially from the combustion of a

[ What is claimed is:] [1.] Process allowing an airbag (1) for protecting an occupant of a motor vehicle to be inflated in a gradual manner by means of a device consisting mainly of the said airbag connected to a pyrotechnic generator (2) of gases arising at least partially from the combustion of a solid double-composition pyrotechnic charge (9) placed inside the said generator, the combination of which charge may be initiated by an igniter (8) coupled to a collision detector, characterized in that:(i) a solid pyrotechnic charge is used which consists of a main pyrotechnic charge (23) having a linear burning rate V.sub.1 at least equal to 25 mm/s under a pressure of 20 MPa and the surface of which is at least partially covered with an external skin (24) of pyrotechnic composition adhering to the said main charge by simple deposition, the thickness of which being less or equal to 0.1 mm and having a linear burning rate V.sub.2 which satisfies, under a pressure of 20 MPa, the relationship:EQU 0.05 V.sub.1 .ltoreq.V.sub.2 .ltoreq.0.5 V.sub.1 ;(ii) pyrotechnic nitrocellulose-based compositions and composite pyrotechnic compositions mainly consisting of a binder and of a powerful charge are used to constitute the said main pyrotechnic charge and the said pyrotechnic skin;(iii) the said double-composition charge is placed inside the said generator so that the entire surface of the main charge thus covered serves as the combustion initiation surface of the latter when the said igniter is actuated by the collision detector.