The invention relates to an overigniting protection device (40) for a multi-stage gas generator (10), comprising a combustion chamber limiting element (34) for limiting a combustion chamber (30) of a second ignition stage (14) of the gas generator (10) as well as an overigniting protection element (38) which is arranged on a side of the combustion chamber limiting element (34) remote from the combustion chamber (30), wherein the overigniting protection element (38) covers the side of the combustion chamber limiting element (34) remote from the combustion chamber (30), wherein the overigniting protection element (38) is tightly connected to the combustion chamber limiting element (34) via a mounting portion (42) and wherein the overigniting protection element (38) is substantially plate-shaped or completely covers the side of the combustion chamber limiting element (34) remote from the combustion chamber (30). Furthermore, the invention relates to a second ignition stage (14) of a multi-stage gas generator, a gas generator (10) and an airbag module comprising a gas generator (10).

A pyrotechnical gas generator includes at least one pyrotechnical charge, at least one ignitor, and a cylindrical casing enclosing the at least one charge and the at least one ignitor, the cylindrical casing having an axial direction and a radial direction and including an annular wall extending along the axial direction of the casing, and gas ejection holes arranged on the annular wall. Each gas ejection hole extends in a output plan forming a non-zero angle with a tangential plan which is tangent to the annular wall at the gas ejection hole.

An airbag device includes an airbag that is supplied with gas during a vehicle collision, and that inflates and deploys from a rear side of a vehicle seat toward a front side via an upper side thereof. In an inflated and deployed state the airbag includes a pair of front-rear chambers extending in a front-rear direction via left and right sides of the head of a passenger, and an airbag body in communication with the pair of front-rear chambers, that is disposed at a front side of the passenger between the pair of front-rear chambers, and that is compression deformed in a state supported by the pair of front-rear chambers during restraint of the passenger. The airbag is configured such that entry of at least the head of the passenger into gaps between the front-rear chambers and the airbag body is suppressed during a latter half of restraining the passenger.

A hybrid airbag inflator (100, 200) has a disk-shaped pressure vessel having a central axis with a domed upper housing portion (20) with a sealed exhaust port (22) for releasing inflation gases and a domed lower body portion (10) welded to the domed upper housing portion (20). The domed lower body portion (10) has one or more protrusions (12) extending from an outer or exterior surface positioned offset from the center axis. At least one of the protrusions (12) houses an igniter assembly (60) with accessible electrical connections (61, 63). The disk-shaped pressure vessel inflator (100, 200) contains gas generant pellets (2) and a quantity of pressurized inert gas (1) for inflating an airbag. The combination of the protrusions (12) and domed lower body portion (10) has a unique profile of a petaloid shape. Optionally, the domed upper housing portion (20) can also have the petaloid shape.

The present invention provides a gas generator including: a housing having a top plate, a bottom plate located axially opposite to the top plate, and a circumferential wall located between the top plate and the bottom plate and provided with a gas discharge port; a partition wall provided with a single first communication hole, the partition wall being radially disposed in the housing to partition an interior of the housing into a first combustion chamber on the side of the top plate, which accommodates a first gas generating agent, and a second combustion chamber on the side of the bottom plate, which accommodates a second gas generating agent; a cylindrical guide member disposed between the first igniter attached to the bottom surface and the first communication hole, and provided with a second communication hole in a cylindrical wall thereof, the cylindrical guide member being disposed so as to enclose the first igniter, such that a second end opening thereof is connected to the first communication hole of the partition wall, the second end opening or the first communication hole being closed by a first closing member in a state where the second end opening or the first communication hole faces the first combustion chamber, the second communication hole closed by a second closing member in a state where the second communication hole faces the second combustion chamber, and a rupturing pressure of the first closing member being set lower than a rupturing pressure of the second closing member.

An ignition device includes an igniter fixed to an igniter collar, a first cup member filled with a gas generating component therein, and a second cup member. The first cup member covers the igniter collar to enclose a portion including an ignition portion of the igniter. The second cup member covers the igniter collar to enclose the first cup member. A gap is formed between an outer surface of the first cup member and an inner surface of the second cup member to function as a heat insulating layer. The first cup member has a first opening, and the second cup member has a second opening. At least one of the first opening and the second opening is closed before actuation and is opened only when gas is generated from the gas generating component.

An ignition device includes an igniter fixed to an igniter collar, a first cup member filled with a gas generating component therein, and a second cup member. The first cup member covers the igniter collar to enclose a portion including an ignition portion of the igniter. The second cup member covers the igniter collar to enclose the first cup member. A gap is formed between an outer surface of the first cup member and an inner surface of the second cup member to function as a heat insulating layer. The first cup member has a first opening, and the second cup member has a second opening. At least one of the first opening and the second opening is closed before actuation and is opened only when gas is generated from the gas generating component.

The invention relates to a hybrid inflator (10) includes at least one combustion chamber (15) in which propellant charge is arranged and which has a discharge end (20), the propellant charge being formed of at least one propellant element (26), at least one igniting unit (12) by which the propellant charge can be ignited. The hybrid inflator (10) also includes at least one bursting element (14, 14, 14) which in the inactivated state of the hybrid inflator (10) delimits the combustion chamber (15) against a gas supply chamber (16) at the discharge end (20). The bursting element (14, 14, 14) and a restraint element (18, 18, 18) maintain the propellant charge in its position and/or the bursting element (14, 14, 14) and the propellant charge delimit a shock gas volume (SGV), wherein in the activated state of the hybrid inflator (10) the shock gas volume (SGV) acts on the bursting element (14, 14, 14) like a gas pressure spring.

A gas generator (10) comprises an outer housing, which has at (east two housing parts (12), which are connected to each other, in the form of a diffuser bowl (14) with outflow openings (16) towards the outside and a cover (20) directly connected to the diffuser bowl (14). Inside the gas generator (10), at least one first and one second combustion chamber (30, 36) are provided, wherein the first combustion chamber (30) is delimited by an inner wall (32) and the second combustion chamber (36) is located within the space delimited by the diffuser bowl (14) and the cover (20). The diffuser bowl (14) and/or the cover (20) comprise a section (24) that is shaped, in particular deep-drawn, into an indentation, forming at least partially a circumferential section of the inner wall (32).

In a gas generator, a closing member includes: a first region exposed to a side of a second combustion chamber in a closed state, a second region in contact with a partition member from a side of the first combustion chamber in the closed state, and an engagement region that engages an engaged member fixed in a housing in the closed state; and the closing member is configured to have one or a plurality of communication holes be in a closed state by the closing member being supported at the partition member in the second region due to combustion pressure of a first gas generating agent and to have the closed state released by at least a part of the closing member, the closing member including a displacement portion that is formed continuously so as to be included at least a part of the first region, being displaced in a direction from the side of the second combustion chamber toward the side of the first combustion chamber by combustion pressure of a second gas generating agent acting on the first region.