The present invention provides a gas generator including: a cylindrical housing having an ignition device which is fixed to an opening at a first end, and a second end which is closed, the inside of the cylindrical housing being provided with an ignition device chamber, a gas inflow chamber and a pressurized gas chamber, these chambers being arranged in the above order from the first end; a rupturable plate closing a gas outflow port between the pressurized gas chamber and the gas inflow chamber; and a breaking device arranged between the ignition device chamber and the gas inflow chamber, the breaking device including a base and a rod extending from the base towards the rupturable plate, the rod including a rod main body portion and a rod enlarged-diameter portion at a distal end portion thereof, the rod enlarged-diameter portion including a distal end surface portion facing the rupturable plate and a circumferential wall portion, the distal end surface portion of the rod enlarged-diameter portion including a breaking portion and a non-breaking portion for the rupturable plate, the non-breaking portion being a concave portion which is formed in a portion including a circumferential region of the distal end surface portion and concaved in a thickness direction, a circumferential extent in which the non-breaking portion is formed as the concave portion being in such a range that an angle around the center of the distal end surface portion is not more than 100 degrees.

The present invention provides a gas generator, including a housing having therein an ignition device chamber, which is provided with a gas discharge port and accommodates an ignition device, and a pressurized gas chamber filled with a pressurized gas, the ignition device chamber and the pressurized gas chamber being separated by a partition wall having a communication hole, the partition wall being in a cup-like shape which includes a bottom surface and a circumferential wall surface, projects toward the pressurized gas chamber and has a flange portion at a portion corresponding to an opening in the cup-like shape of the partition wall, only the circumferential wall surface having the communication hole, the flange portion being fixed to the housing, a disk closing member being disposed inside the partition wall to be movable in the axial direction of the housing with a distance from the bottom surface, prior to activation, the communication hole being closed by a circumferential surface of the disk closing member, and at the time of activation, the closing member being moved toward the bottom surface by combustion products generated by the ignition device, thereby opening the communication hole and making communication between the ignition device chamber and the pressurized gas chamber.

The present invention provides a gas generator in which no positioning device for a cylindrical filter is needed, and a method of assembling the gas generator.

The inside of a combustion chamber is filled with a predetermined amount of a molded article of a gas generating agent in a state in which an outside positioning jig is disposed between a cylindrical filter and a circumferential wall portion of a diffuser shell, and an inside positioning jig is disposed between the cylindrical filter and an inner tube. Upon completion of the filling, the two positioning jigs are removed, and the molded article of the gas generating agent is pressed in by an annular underplate. The cylindrical filter is positioned by this pressing-in.

An igniter assembly includes: an ignition device including: an igniter including an ignition portion airtightly accommodating an ignition charge and a conductive portion that supplies an ignition current for igniting the ignition charge, an igniter holding portion having a tubular shape and holding the igniter, and a fixing member made of a resin, interposed between the igniter and the igniter holding portion, and fixing the igniter to the igniter holding portion; a case having a bottomed tubular shape and accommodating a first gas generating agent and the ignition portion of the igniter, and a partition wall partitioning an inside of the case into a space in which the igniter and the fixing member are disposed and a space in which the first gas generating agent is accommodated, the partition wall having moisture impermeability. The partition wall is fixed and in contact with the case.

The present invention provides an inflator including a rupturable plate closing between the ignition device chamber having a gas discharge port and the pressurized gas chamber filled with a pressurized gas; a partition wall provided with a rod axially separating an interior of an ignition device unit housing, corresponding to the ignition device chamber, into two chambers; a combustion chamber provided on the side of a first end of the ignition device unit housing and provided with an igniter, and a diffuser chamber having the gas discharge port and provided on the side of a second end, which is an opposite end to the first end, the rupturable plate being circular and having, a circumferential edge fixing portion and a circular non-fixing portion on an inner portion other than the circumferential edge fixing portion, a fragile portion formed by not less than three grooves provided on a first surface facing the bottle, the grooves extending from a circumference of the circular non-fixing portion or from positions in the vicinity thereof, as a start point, toward a center of the circular non-fixing portion such that each of end points of the grooves does not reach the center of the circular non-fixing portion, the rod fixed to the partition wall and extending toward the rupturable plate, and the rod colliding with the rupturable plate due to a gas pressure generated by activation of the igniter, coming into contact with all of the end points in the fragile portion and rupturing the rupturable plate.

A vehicular safety restraint inflator device, the inflator device includes a tubular housing to provide inflation gas to inflate an associated inflatable restraint device and a toroidal clamp stop positioned on the tubular inflator housing. The clamp stop serves to provide a hard stop for an inflator attachment clamp to secure the inflator device within an airbag module and thus to minimize or avoid undesired lateral movement of the inflator device within a module assembly.

An igniter assembly includes: an ignition device including: an igniter including an ignition portion airtightly accommodating an ignition charge and a conductive portion that supplies an ignition current for igniting the ignition charge, an igniter holding portion having a tubular shape and holding the igniter, and a fixing member made of a resin, interposed between the igniter and the igniter holding portion, and fixing the igniter to the igniter holding portion; a case having a bottomed tubular shape and accommodating a first gas generating agent and the ignition portion of the igniter, and a partition wall partitioning an inside of the case into a space in which the igniter and the fixing member are disposed and a space in which the first gas generating agent is accommodated, the partition wall having moisture impermeability. The partition wall is fixed and in contact with the case.

A gas generator includes a gas generating agent that generates gas by combustion, a housing made of metal and accommodating the gas generating agent therein, the housing having a gas discharge port formed therein, through which the gas is emitted to an exterior of the housing, an ignition device configured to ignite the gas generating agent by actuation; and a temperature rise suppressing member provided in contact with an outer surface of a housing to cover at least a part of the outer surface. The temperature rise suppressing member includes an endothermic agent that absorbs heat of the housing by undergoing a chemical change or a state change by the heat of the housing when a temperature of the housing rises due to combustion of a gas generating agent, and a binder agent present together with the endothermic agent such that the temperature rise suppressing member has flexibility.

There is obtained a gas generator that can suppress deterioration due to moisture absorption of a gas generating agent in a housing, can reduce the number of parts, and can be easily assembled as compared with the related art. A gas generator includes a housing, a holder attached to one opening end of the housing, a closing member attached to another end of the housing so as to close another opening end of the housing, and a side surface cover covering a part of the holder and a part of an igniter. The side surface cover has an end welded and fixed to the housing and the holder at a welded fixed portion in a state of being sandwiched between an inner wall of the housing and a side surface portion. The welded fixed portion is formed in an annular shape along the circumferential direction of the housing by being subjected to welding processing from the outside of the housing along a circumferential direction of the housing at a position corresponding to the side surface portion covered by the side surface cover.

A gas generator includes a housing main body, a holder assembly, and an igniter. The holder assembly includes a metallic holder portion and a connector portion made of resin. The holder portion includes a first barrel portion in a cylindrical shape provided with a first end surface provided with a recess, and the connector portion includes a second barrel portion in a cylindrical shape provided with a second end surface provided with a projection and a locking portion that projects toward an inner circumferential surface of the housing main body provided with a step portion. In an axial direction, the projection and the recess abut on each other and the locking portion and the step portion abut on each other, and in a circumferential direction, the projection and the recess abut on each other, so that the connector portion is immovably fixed in the axial direction and the circumferential direction.