The present invention provides a gas generator for a restraining device, including: a housing;an ignition device chamber housing and an outer cylindrical wall portion disposed inside the housing; andan annular partition wall portion forming a space near a top plate between the ignition device chambe
The present invention provides a gas generator for a restraining device, including: a housing;an ignition device chamber housing and an outer cylindrical wall portion disposed inside the housing; andan annular partition wall portion forming a space near a top plate between the ignition device chamber housing and the outer cylindrical wall portion,a portion defined by the top plate and a bottom plate of the housing, the ignition device chamber housing and the outer cylindrical wall portion is a combustion chamber charged with a gas generating agent;an inner cylindrical wall portion, disposed on the housing bottom plate and spaced from the annular partition wall portion, is provided inside the combustion chamber;the ignition device chamber and the combustion chamber communicate with each other by a first communication portion;the combustion chamber and the space communicate with each other by a gas-flow hole of the annular partition wall portion;the first communication portion and the inner cylindrical wall portion face each other in the radial direction of the housing; anda combustion product generated in the ignition device chamber passes through the first communication portion, then collides with the inner cylindrical wall portion, changes a flow direction toward the top plate, and passes through the gas-flow hole of the annular partition wall portion.
대표청구항▼
1. A gas generator for a restraining device, comprising: a housing including a top plate, a circumferential wall provided with a gas discharge port and a bottom plate;a tubular ignition device chamber housing being disposed inside the housing to form an ignition device chamber, that accommodates an
1. A gas generator for a restraining device, comprising: a housing including a top plate, a circumferential wall provided with a gas discharge port and a bottom plate;a tubular ignition device chamber housing being disposed inside the housing to form an ignition device chamber, that accommodates an ignition device, and having one end opening closed;an outer cylindrical wall portion being disposed such that a gas discharge path in communication with the gas discharge port is formed between the circumferential wall and the outer cylindrical wall portion;an annular partition wall portion having a gas-flow hole and being disposed between the ignition device chamber housing and the outer cylindrical wall portion to form a space with the top plate;a combustion chamber enclosed by the top plate, the bottom plate, the ignition device chamber housing, and the outer cylindrical wall portion and being charged with a gas generating agent therein;an inner cylindrical wall portion arranged on the bottom plate and spaced from the ignition device chamber housing and the outer cylindrical wall portion, and also at a distance from the annular partition wall portion;the ignition device chamber and the combustion chamber communicating with each other by a first communication portion formed by an opening provided in a circumferential wall portion of the ignition device chamber housing on the bottom plate side;the combustion chamber and the space formed by the annular partition wall portion communicating with each other by the gas-flow hole of the annular partition wall portion;the space formed by the annular partition wall portion and the gas discharge path which communicates with the gas discharge port, communicating with each other by a second communication portion formed by an opening provided between the outer cylindrical wall portion and the top plate;the first communication portion and the inner cylindrical wall portion facing each other in a radial direction of the housing; anda combustion product, which is generated in the ignition device chamber, passing through the first communication portion, then colliding with the inner cylindrical wall portion, changing a flow direction toward the top plate where the second communication portion is provided, and passing through the gas-flow hole of the annular partition wall portion. 2. The gas generator for a restraining device according to claim 1, wherein the inner cylindrical wall portion meets at least Requirement (a) among requirements selected from following Requirements (a) to (c); andRequirement (a) is met by that a ratio (h1/h2) of a height (h1) from the bottom plate to the upper end of the inner cylindrical wall portion and a height (h2) from the bottom plate to the annular partition wall portion is within a range of 0.3 to 0.7;(a) a height range of the inner cylindrical wall portion in the axial direction of the housing from the bottom plate is adjusted;(b) a distance between the inner cylindrical wall portion and the ignition device chamber housing is adjusted; and(c) an inclination angle of the inner cylindrical wall portion with respect to the bottom plate is adjusted. 3. The gas generator for a restraining device according to claim 2, wherein Requirement (b) is met by that a ratio (L1/L2) of a distance (L1) from the ignition device chamber housing to the inner cylindrical wall portion to a distance (L2) from the ignition device chamber housing to the outer cylindrical wall portion is within a range of 0.1 to 0.9, andRequirement (c) is met by that an angle between the bottom plate and the inner cylindrical wall portion on a side of the ignition device chamber housing is 70° to 140°. 4. The gas generator for a restraining device according to claim 1, wherein the height, from the bottom plate, of the upper end of the opening forming the first communication portion is equal to or less than half of the height (h1) from the bottom plate to the upper end of the inner cylindrical wall portion. 5. The gas generator for a restraining device according to claim 1, wherein the inner cylindrical wall portion has a cylindrical wall surface and an outer annular flat surface extending outward in the radial direction of the housing from an outer circumferential edge at a lower end of the cylindrical wall surface;the outer cylindrical wall portion has a cylindrical wall surface and an inner annular flat surface extending inward in the radial direction of the housing from an inner circumferential edge at a lower end of the cylindrical wall surface;the inner cylindrical wall portion and the outer cylindrical wall portion is formed integrally at the outer annular flat surface and the inner annular flat surface; andan outer circumferential surface of the cylindrical wall surface of the outer cylindrical wall portion is fitted in a state of abutment against a circumferential wall of the housing where the gas discharge port is not formed. 6. The gas generator for a restraining device according to claim 1, wherein the inner cylindrical wall portion has a cylindrical wall surface and an inner annular flat surface extending inward in the radial direction of the housing from an inner circumferential edge at a lower end of the cylindrical wall surface; andan inner circumferential edge of the inner annular flat surface of the inner cylindrical wall portion is fitted in a state of abutment against the ignition device or the ignition device chamber housing. 7. The gas generator for a restraining device according to claim 1, wherein the inner cylindrical wall portion has a cylindrical inclined wall surface inclined outward in the radial direction of the housing and an inner annular flat surface extending inward in the radial direction of the housing from an inner circumferential edge at a lower end of the inclined wall surface; andan inner circumferential edge of the inner annular flat surface of the inner cylindrical wall portion is fitted in a state of abutment against the ignition device or the ignition device chamber housing. 8. The gas generator for a restraining device according to claim 2, wherein the inner cylindrical wall portion has a cylindrical wall surface and an outer annular flat surface extending outward in the radial direction of the housing from an outer circumferential edge at a lower end of the cylindrical wall surface;a circumferential edge portion at the upper end of the cylindrical wall surface has depression and protrusion in the axial direction of the housing, the depression and protrusion are formed in a plurality of locations in the circumferential direction, and h1 in Requirement (a) is a height from the bottom plate to the depression of the cylindrical wall surface;the outer cylindrical wall portion has a cylindrical wall surface and an inner annular flat surface extending inward in the radial direction of the housing from an inner circumferential edge of the cylindrical wall surface;the inner cylindrical wall portion and the outer cylindrical wall portion are formed integrally at the outer annular flat surface and the inner annular flat surface; andan outer circumferential surface of the cylindrical wall surface of the outer cylindrical wall portion is fitted in a state of abutment against a circumferential wall of the housing where the gas discharge port is not formed. 9. The gas generator for a restraining device according to claim 2, wherein the inner cylindrical wall portion has a cylindrical wall surface and an inner annular flat surface extending inward in the radial direction of the housing from an inner circumferential edge at a lower end of the cylindrical wall surface;a circumferential edge portion at the upper end of the cylindrical wall surface has depression and protrusion in the axial direction of the housing, and the depression and protrusion are formed in a plurality of locations in the circumferential direction;h1 in Requirement (a) is a height from the bottom plate to the depression of the cylindrical wall surface;an inner circumferential edge of the inner annular flat surface of the inner cylindrical wall portion is fitted in a state of abutment against the ignition device or the ignition device chamber housing. 10. The gas generator for a restraining device according to claim 2, wherein a plurality of through holes are formed in the circumferential direction in the cylindrical wall surface of the inner cylindrical wall portion; andh1 in Requirement (a) is a height from the bottom plate to a lower end circumferential edge of the through hole. 11. The gas generator for a restraining device according to claim 1, wherein an annular filter is disposed in the space between the top plate and the annular partition wall portion having the gas-flow hole.
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이 특허에 인용된 특허 (5)
McFarland Eric R. ; Green ; Jr. Lloyd G., Air bag inflator with pressure regulation.
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