A gas generator includes a housing, an inner cylindrical member defining an ignition chamber therein and a combustion chamber outside, an ignition device disposed inside the ignition chamber, a solid gas generating agent charged in the combustion chamber, the inner cylindrical member including, a pl
A gas generator includes a housing, an inner cylindrical member defining an ignition chamber therein and a combustion chamber outside, an ignition device disposed inside the ignition chamber, a solid gas generating agent charged in the combustion chamber, the inner cylindrical member including, a plurality of nozzles provided in a circumferential wall to communicate the ignition chamber with the combustion chamber, a guide member provided at least in the outer side or the inner side of the circumferential wall, so that combustion products from the ignition chamber is discharged from the nozzles and guided towards a bottom plate of the housing, the combustion chamber defined by the circumferential wall of the inner cylindrical member and the circumferential wall portion of the housing, an outlet from the inner cylindrical member being formed closer to the bottom plate than to the gas discharge port.
대표청구항▼
1. A gas generator, comprising: a housing including, a first shell having a top plate and a first circumferential wall portion,a second shell having a bottom plate and a second circumferential wall portion, anda gas discharge port formed in the top plate or first circumferential wall portion;an inne
1. A gas generator, comprising: a housing including, a first shell having a top plate and a first circumferential wall portion,a second shell having a bottom plate and a second circumferential wall portion, anda gas discharge port formed in the top plate or first circumferential wall portion;an inner cylindrical member disposed inside the housing, and defining an ignition chamber therein and a combustion chamber in an outside thereof;the inner cylindrical member including, a first end, which is closed,a second end, opposite to the first end, which is closed by the ignition device attached thereto,a plurality of nozzles, provided in a circumferential wall of the inner cylindrical member, that communicates the ignition chamber and the combustion chamber,a guide member provided at least in an outer side or an inner side of the circumferential wall, so that combustion products generated inside the ignition chamber are discharged from the nozzles and guided towards the bottom plate of the second shell;the combustion chamber including, a radially inside portion defined by the circumferential wall of the inner cylindrical member,a radially outside portion defined by at least the second circumferential wall portion, andan outlet that discharges combustion products from the inner cylindrical member during actuation, being formed closer to the bottom plate than to the gas discharge port, the outlet being defined by the inner cylindrical member and the guide member and the outlet maintaining an open state prior to and during an actuation of the gas generator, anda solid gas generating agent that generates combustion gas. 2. A gas generator, comprising: a housing including, a first shell having a top plate and a first circumferential wall portion,a second shell having a bottom plate and a second circumferential wall portion, anda gas discharge port formed in the top plate or the first circumferential wall portion;an inner cylindrical member disposed inside the housing, and defining an ignition chamber therein and a combustion chamber in an outside thereof,the inner cylindrical member including, a first end, which is positioned in a side of the top plate side and closed,a second, opposite to the first end, which is closed by an ignition device attached thereto,a plurality of nozzles, provided in a circumferential wall of the inner cylindrical member, that communicates the ignition chamber and the combustion chamber,a guide member provided at least in an outer side or an inner side of the circumferential wall, so that combustion products generated inside the ignition chamber are discharged from the nozzles and guided towards the bottom plate of the second shell;the combustion chamber including, a radially inside portion defined by the circumferential wall of the inner cylindrical member, anda radially outside portion defined by an outer cylindrical member, the outer cylindrical member being arranged to form a cylindrical gap between the outer cylindrical member and the first circumferential wall portion and the second circumferential wall portion;the cylindrical gap communicating with the gas discharge port, a first communication path formed between the outer cylindrical member and the top plate, communicating the combustion chamber with the cylindrical gap,an outlet that discharges combustion products from the inner cylindrical member during actuation, being formed closer to the bottom plate than to the first communication path, the outlet being defined by the inner cylindrical member and the guide member and the outlet maintaining an open state prior to and during an actuation of the gas generator, anda solid gas generating agent that generates combustion gas. 3. The gas generator according to claim 2, wherein the outer cylindrical member has a large-diameter cylindrical wall portion and a small-diameter cylindrical wall portion with an outer diameter smaller than an outer diameter of the large-diameter cylindrical wall portion,the large-diameter cylindrical wall portion has an outer circumferential surface abutting against the second circumferential wall portion, and the small-diameter cylindrical wall portion opposing the first circumferential wall portion,the cylindrical gap is defined between the small-diameter cylindrical wall portion and at least the first circumferential wall portion, andthe first communication path is defined by a plurality of communication holes formed in a vicinity of the opening of the small-diameter cylindrical wall portion. 4. The gas generator according to claim 2, wherein the outer cylindrical member has a large-diameter cylindrical wall portion and a small-diameter cylindrical wall portion with an outer diameter smaller than an outer diameter of the large-diameter cylindrical wall portion,the large-diameter cylindrical wall portion has an outer circumferential surface abutting against the second circumferential wall portion, and the small-diameter cylindrical wall portion has an opening abutting against the top plate,the cylindrical gap is defined between the small-diameter cylindrical wall portion and at least the first circumferential wall portion, andthe first communication path is formed by a communication hole defined by a plurality of concave portions and the top plate, the concave portions being formed by denting a circumferential wall of the outer cylindrical member at the opening of the small-diameter cylindrical wall portion in a height direction. 5. The gas generator according to claim 2, wherein the outer cylindrical member has a large-diameter cylindrical wall portion and a small-diameter cylindrical wall portion with an outer diameter smaller than an outer diameter of the large-diameter cylindrical wall portion,the large-diameter cylindrical wall portion has an outer circumferential surface abutting against the second circumferential wall portion, and the small-diameter cylindrical wall portion has an opening facing the top plate with a space therebetween,the cylindrical gap is formed between the small-diameter cylindrical wall portion and at least the first circumferential wall portion, andthe first communication path is formed by the space between the opening of the small-diameter cylindrical wall portion and the top plate of the first shell. 6. The gas generator according to claim 2, wherein an annular filter is disposed in a side of the top plate inside the combustion chamber,the annular filter has an outer circumferential surface abutting against the outer cylindrical member, an inner circumferential surface abutting against the inner cylindrical member, one of annular surfaces abutting against the top plate, and the other of the annular surfaces facing the combustion chamber, andthe combustion chamber and the cylindrical gap are communicated with each other by the annular filter and the first communication path. 7. The gas generator according to claim 2, wherein a substantially annular member is disposed in a side of the top plate inside the combustion chamber,the substantially annular member has an annular bottom surface provided with a plurality of communication holes, an external annular wall surface formed in an outer circumference of the substantially annular member, and an internal annular wall surface formed in an inner circumference thereof,the substantially annular member is fitted such that the external annular wall surface abuts against the outer cylindrical member, the internal annular wall surface faces the circumferential wall of the inner cylindrical member, and the annular bottom surface faces the combustion chamber,the substantially annular member is disposed such that an annular space surrounded by the top plate, the external annular wall surface, the annular bottom surface and the inner cylindrical member is formed, andthe combustion chamber and the cylindrical gap are communicated with each other by a second communication path formed by the communication holes of the substantially annular member, the annular space and the first communication path. 8. The gas generator according to claim 2, wherein a substantially annular member is disposed in a side of the top plate inside the combustion chamber,the substantially annular member has an annular bottom surface provided with a plurality of communication holes, and an external annular wall surface formed in an outer circumference of the substantially annular member,the substantially annular member is fitted such that the external annular wall surface abuts against the outer cylindrical member and the annular bottom surface faces the combustion chamber, and the substantially annular member is disposed such that an annular space is formed, surrounded by the top plate, the external annular wall surface, the annular bottom surface and the inner cylindrical member, andthe combustion chamber and the cylindrical gap are communicated with each other by a second communication path formed by the communication holes of the substantially annular member, the annular space and the first communication path. 9. The gas generator according to claim 1, wherein the guide member is a cover member that protrudes downward from the outer side of the circumferential wall of the inner cylindrical member so as to cover the nozzles from above and from outside, a vertical position of the outlet, with respect to a height direction of the inner cylindrical member, for combustion products is determined by an axial length of the guide member, without changing the positions of the nozzles. 10. The gas generator according to claim 1, wherein the guide member is a cover member that protrudes upward in the inside of the circumferential wall of the inner cylindrical member so as to cover the nozzles from below and from inside. 11. The gas generator according to claim 1, wherein the guide member is a cylindrical cover member placed around the inner cylindrical member so as to cover the nozzles from above and from outside,the cylindrical cover member has an annular fixing portion to be fixed to the circumferential wall of the inner cylindrical member and an enlarged-diameter portion extending outward from the annular fixing portion, andthe annular fixing portion is fixed above the nozzles, and the enlarged-diameter portion covers the nozzles from above and from outside. 12. The gas generator according to claim 2, wherein the guide member is a cover member that protrudes downward from the outer side of the circumferential wall of the inner cylindrical member so as to cover the nozzles from above and from outside, a vertical position of the outlet, with respect to a height direction of the inner cylindrical member, for combustion products is determined by an axial length of the guide member, without changing the positions of the nozzles. 13. The gas generator according to claim 2, wherein the guide member is a cover member that protrudes upward in the inside of the circumferential wall of the inner cylindrical member so as to cover the nozzles from below and from inside. 14. The gas generator according to claim 2, wherein the guide member is a cylindrical cover member placed around the inner cylindrical member so as to cover the nozzles from above and from outside,the cylindrical cover member has an annular fixing portion to be fixed to the circumferential wall of the inner cylindrical member and an enlarged-diameter portion extending outward from the annular fixing portion, andthe annular fixing portion is fixed above the nozzles, and the enlarged-diameter portion covers the nozzles from above and from outside. 15. The gas generator according to claim 1, wherein the guide member guides the combustion product discharged from the plurality of nozzles in a downward direction along an outer surface of the inner cylindrical member. 16. The gas generator according to claim 2, wherein the guide member guides the combustion product discharged from the plurality of nozzles in a downward direction along an outer surface of the inner cylindrical member.
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