GAS GENERATING DEVICE FOR AIR BAG AND AIR BAG INFLATING METHOD

摘要

A gas generating device for an air bag mounted on a vehicle or the like to protect an occupant by injecting a gas into and inflating an air bag interposed between the occupant and cab parts at the time of collision, which comprises a first chamber (9) containing a flammable fluid (7) and having a first vent opening (8) communicating to an air bag (3), a second chamber (5) containing the flammable fluid (7) and being larger than the first chamber (9), a first closure member (31) for closing the first vent opening (8), and ignition means (14) for igniting the flammable fluid (7) in the first chamber (9), and wherein at least a part of the flammable fluid (7) in the first chamber (9) is burnt whereby the fluid in the first chamber (9) and the second chamber (5) is discharged through the first vent opening (8) to inflate the air bag (3). Accordingly, it is possible to shorten an initial response time during which the air bag begins to inflate since the first closure member is quickly broken to discharge the burning fluid mixture in the first chamber.