Patent ID: 7503581

Claim:
A gas generator for an occupant restraining device of a vehicle, including a substantially cup-like shaped diffuser shell having a plurality of gas discharge ports on a circumferential wall portion, a substantially cup-like shaped closure shell combined with the diffuser shell to form an outer container, a housing formed by a diffuser shell and closure shell, an ignition device, a gas generating agent ignited and combusted by activation of the ignition device to generate a combustion gas, and a substantially cylindrical filter for purifying and cooling the combustion gas generated by the gas generating agent, the ignition device, the gas generating agent and the cylindrical filter being accommodated in the housing and forming a single ignition chamber, the housing formed by inserting part of an outer peripheral surface in an open portion side of the closure shell into part of an inner peripheral surface in an open portion side of the diffuser shell to abut against each other, so that they are integrated, an annular retainer disposed inside the housing and having at least one annular surface thereof supported by an annular end surface of an open portion of the closure shell, the filter supported by abutting one end surface thereof against a ceiling surface of the diffuser shell and abutting the other surface against another annular surface of the annular retainer, a annular space obtained between the circumferential wall portion having the gas discharge ports of the diffuser shell and an outer circumferential surface of the filter.