Gas generator, in particular for an airbag protecting a vehicle passenger against injuries

摘要

The gas generator (10) has a housing (12) in which a reservoir chamber (24) for liquid gas (28) is formed. The reservoir chamber (24) is separated by a partition wall (26) from a combustion chamber (40) which is also formed in the housing (12). In a precombustion chamber (34), a firing device (32) is connected whose firing charge produces combustion gases when fired. A piston (36) which, by virtue of the combustion gases of the firing charge, moves into the combustion chamber (40) and moves through the latter in the direction of the partition wall (26) in order to penetrate the latter is displaceably guided in the precombustion chamber (34). When the partition wall (26) is penetrated, the reservoir chamber (24) and the combustion chamber communicate with each other via a liquid gas channel system (58, 60) so that liquid gas (28) can flow into the combustion chamber (40). At the same time, communication is established between the precombustion chamber (34) and the (main) combustion chamber (40) via firing channels (66) formed in the piston (36). The hot combustion gases of the firing charge ignite the in-flowing liquid gas. The rising internal pressure in the combustion chamber (40) is converted into a displacement of the longitudinally displaceably guided partition wall which moves, together with the piston (36) and, in this process, continuously injects liquid gas (28) out of the reservoir chamber (24) into the combustion chamber (40). The combustion gases (40) pass into the open air through outlet openings (56) via annular chambers (48, 54) connected in series. IMAGE