Provided is a gas generator including in a housing having a top plate, a bottom plate and a circumferential wall provided with a gas discharge port; a first combustion chamber arranged on the side of the top plate; a second combustion chamber arranged on the side of the bottom plate; a plenum chamber facing the gas discharge port and arranged between the first combustion chamber and the second combustion chamber; a first igniter for igniting and burning a first gas generating agent in the first combustion chamber; and a second igniter for igniting and burning a second gas generating agent in the second combustion chamber.

Expanded metal sheets are used to produce tubular filters. The expanded metal sheet has a multiplicity of rows of openings arranged to reduce nesting when the sheet is rolled on itself. In particular, the pitch between the rows of openings, the sizes of the openings, or both the pitch between the rows of openings and the sizes of the openings are varied to reduce nesting when the expanded metal sheet is rolled on itself. The filters can include external circumferential grooves, rounded corners produced by a point loading process, textured surfaces between openings, and/or torturous internal paths produced by non-perforated areas of an expanded metal sheet. The expanded metal sheet can be composed of carbon steel coated with a material having a higher heat conductivity, e.g., tin. Among other things, the filters can be used in automobile airbag inflators to capture slag and absorb heat produced by the inflator's explosive charge.

The present invention relates to a gas generator including a cylindrical filter in a housing including a gas discharge port, the housing including a plurality of independent protrusions or an annular protrusion protruding inwardly from an inner wall surface of the housing, the independent protrusions including an annular protruding wall surface, the annular protrusion including an annular tip surface, the cylindrical filter including a first annular end surface and a second annular end surface, a support member which includes an annular surface portion for supporting the cylindrical filter being arranged, the annular surface portion being an annular planar portion, or including an annular planar portion and a deformed portion for which all or a part of at least one of the inner peripheral portion and the outer peripheral portion of the annular planar portion is deformed, the support member being configured such that a part of the support member including an outer peripheral portion of the annular planar portion is arranged abutting against the annular protruding wall surface of the independent protrusions or the first annular protruding wall surface of the annular protrusion, and the second annular end surface of the cylindrical filter abutting against the annular planar portion of the support member, and the first annular end surface abutting against an inner wall surface of the housing.

Provided is a gas generator including the housing with a gas discharge port. The housing has a circular shape and includes a top plate, a bottom plate, and a peripheral wall, the housing having a ratio of an axial length L to an outer diameter D satisfying L/D1.1. The gas discharge port includes first opening portions having low burst pressure (P1) of the closing member and second opening portions having burst pressure (P2) higher than the burst pressure (P1). The first opening portions and second opening portions are formed on a circumference of a same circle in at least one of the peripheral wall or the top plate, and the first opening portion and the second opening portion, which are adjacent to each other in a circumference direction, are arranged such that an angle (1) formed by a first center line extending from a center of the same circle to a center of the first opening portion and a second center line extending from the center of the same circle to a center of the second opening portion is in a range from 15 to 65.

A gas generator includes a plurality of gas discharge openings arranged in a circumferential wall portion along a circumferential direction as not overlapping with each other. The plurality of gas discharge openings consist of one group or two or more groups of first gas discharge openings, one group or two or more groups of second discharge openings, and one group or two or more groups of third gas discharge openings. The gas discharge openings included in each of the groups of first to third gas discharge openings are set to be opened at an identical opening pressure. The second gas discharge openings are higher in opening pressure than the first gas discharge openings and lower in opening pressure than the third gas discharge openings. The gas discharge openings included in each group of gas discharge openings are evenly arranged in rotation symmetry at an angle not greater than 120.

The present invention provides a gas generator, including: in a cylindrical housing, a cup-shaped member separating the combustion chamber in a cylindrical housing main body portion from the diffuser portion, the cup-shaped member being disposed such that a bottom surface thereof is positioned on the side of a first end of the cylindrical housing main body portion, an opening thereof is positioned on the side of a second end of the cylindrical housing main body portion, and a first gap which allows the combustion chamber to communicate with the diffuser portion, is formed between the the cup-shaped member and an inner wall surface of the cylindrical housing main body portion; and a filter disposed in a space surrounded by the cup-shaped member and the diffuser portion, the filter being a cup-shaped filter having a base, a circumferential wall and an opening, and the filter being provided such that, the base of the filter abuts on a closed end surface of the diffuser portion, an end surface of the opening of the filter faces the bottom surface of the cup-shaped member, and the circumferential wall of the filter abuts, from inside, on the circumferential wall of the cup-shaped member including a plurality of the communication holes, and being disposed with a second gap formed between the filter and the gas discharge ports.

Provided is a gas generator including a housing including a top plate, a bottom plate, and a peripheral wall, the bottom plate being axially opposite the top plate, and the peripheral wall including a gas discharge port and being located between the top plate and the bottom plate. In the gas generator, an internal space of the housing is separated into a first combustion chamber and a second combustion chamber by a partition wall axially and radially partitioning the internal space of the housing, the first combustion chamber being formed to accommodate a first gas generating agent and being on the top plate side, and the second combustion chamber being formed to accommodate a second gas generating agent and being on the bottom plate side. A first igniter and a second igniter are disposed at the bottom plate, the first igniter being configured to burn the first gas generating agent, and the second igniter being configured to burn the second gas generating agent. The partition wall includes a cylindrical portion and an annular portion, the cylindrical portion being formed to surround the first igniter and include a communication hole for making the first combustion chamber and the second combustion chamber to communicate with each other, and the annular portion being formed extend radially outward from a second opening on the top plate side of the cylindrical portion. A first opening of the cylindrical portion axially opposite the second opening is in contact with the first igniter, and an outer periphery of the annular portion is in contact with the peripheral wall of the housing, and, thereby, the first combustion chamber and the second combustion chamber are separated from each other.

Expanded metal sheets are used to produce tubular filters. The expanded metal sheet has a multiplicity of rows of openings arranged to reduce nesting when the sheet is rolled on itself. In particular, the pitch between the rows of openings, the sizes of the openings, or both the pitch between the rows of openings and the sizes of the openings are varied to reduce nesting when the expanded metal sheet is rolled on itself. The filters can include external circumferential grooves, rounded corners produced by a point loading process, textured surfaces between openings, and/or torturous internal paths produced by non-perforated areas of an expanded metal sheet. The expanded metal sheet can be composed of carbon steel coated with a material having a higher heat conductivity, e.g., tin. Among other things, the filters can be used in automobile airbag inflators to capture slag and absorb heat produced by the inflator's explosive charge.

An ejector for ejecting a combustion product including, an igniter including an ignition charge and an ignition portion, a pyrotechnic agent, and a cup made of metal, the cup including a bottom surface and a peripheral wall, the peripheral wall being contiguous with a peripheral edge of the bottom surface and disposed to surround the ignition portion, the cup further including an accommodating space accommodating therein the pyrotechnic agent, the bottom surface of the cup including a through hole being defined by a plurality of through-hole peripheral edges, and the adjacent through-hole peripheral edges being connected together at a predetermined connection point, and the through hole including a narrow part, in which a width of the through hole defined by each of parts of the two through-hole peripheral edges of the plurality of through-hole peripheral edges decreases gradually with an increasing distance from a center of the bottom surface toward the peripheral edge of the bottom surface, and the narrow part being located closer to the peripheral edge of the bottom surface than a non-narrow part, which is defined by each of other parts of the two through-hole peripheral edges, is located.

The present invention provides a gas generator, including: an ignition device being disposed at a first end of a cylindrical housing main body portion, a diffuser portion being provided with a gas discharge port and closing a second end thereof which is axially opposite to the first end; a combustion chamber being present in an internal space of the cylindrical housing main body portion; a cup-shaped member partitioning the combustion chamber and the diffuser portion, a bottom surface and an opening of the cup-shaped member being located on the side of the first end and the second end of the cylindrical housing main body portion respectively, and a first gap being formed between the circumferential wall of the cup-shaped member and an inner wall surface of the cylindrical housing main body portion; a cylindrical filter being disposed in a space surrounded by the cup-shaped member and the diffuser portion, and a first end surface of the cylindrical filter being abutted against the bottom surface of the cup-shaped member, and a second end surface thereof on the opposite side being abutted against a closed end surface of the diffuser portion; and the communication hole of the cup-shaped member being formed at a position closer to the first end surface of the cylindrical filter to face the first gap, and the gas discharge port of the diffuser portion being formed closer to the second end surface of the cylindrical filter.