Gas generator for an airbag and air bag apparatus

摘要

The present invention relates to an air bag system, and particularly relates to a gas generator having two or more combustion chambers (5a,5b), namely, a gas generator for an air bag having, in a housing (3) with a gas discharge port (26), an ignition means (12a,12b) to be activated on an impact, and gas generating means (9a,9b) which is to be ignited and burnt by the ignition means and generate a combustion gas for inflating an air bag, wherein two combustion chambers storing the gas generating means are concentrically provided so as to be adjacent to each other in the radial direction of the housing, and a communicating hole (10) which allows communication between the combustion chambers is provided, in the housing. Additionally, the present invention relates to a gas generator including two igniters, a gas generator including two different gas generating means, a gas generator including an igniter having a lead wire, a gas generator having a combustion chamber and ignition means in an inner cylindrical member, and a gas generator including an automatic ignition member, which can effectively restrain an occupant.