WO2005014344A1 - ガス発生器 - Google Patents
ガス発生器 Download PDFInfo
- Publication number
- WO2005014344A1 WO2005014344A1 PCT/JP2004/011231 JP2004011231W WO2005014344A1 WO 2005014344 A1 WO2005014344 A1 WO 2005014344A1 JP 2004011231 W JP2004011231 W JP 2004011231W WO 2005014344 A1 WO2005014344 A1 WO 2005014344A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas
- combustion chamber
- housing
- inner cylinder
- gas generator
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
- B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
Definitions
- the present invention relates to a gas generator suitable for inflating an airbag or the like.
- a gas generator for rapidly inflating and deploying an airbag in order to protect an occupant from an impact generated at the time of a vehicle collision is incorporated in an airbag module installed in a steering wheel or an instrument panel.
- the gas generator activates the igniter (squib) by an electric signal from the control unit (actuator), and the gas from the ignition device burns the gas generating agent to rapidly generate a large amount of gas. It is something that makes you.
- Conventional gas generators include a central space corresponding to an ignition chamber for a gas generating agent, and a filter chamber formed concentrically outside the combustion chamber for performing combustion / cooling of gas and collection of slag.
- a so-called two-cylinder gas generator having a corresponding annular space.
- FIG. 2 As this type of gas generator, for example, there is one as shown in FIG. 2 (for example, see Patent Document 1).
- the center of the housing structure obtained by butt-welding the upper case 51 of the two-tube structure and the lower case 54 of the double-short tube structure to each other.
- the space is defined as an ignition chamber, and the surrounding annular space is defined as a combustion / filter chamber F.
- the squib 68 and the transfer charge 69 are installed in the ignition chamber P from below.
- a concave ring-shaped lid member 66 having a cross section with both flanges is fixed with the flanges 66d and 66e abutting the burrs 52b and 53b of the upper container 51, respectively. I have. Then, the gas generating agent 57 and the cooling 'slag collecting member 60 are accommodated in the annular space interposed between the lid member 66 and the upper container 51 in the radial direction, so that the combustion' filter chamber F is formed. ing.
- ring-shaped cushion members 58, 59 are interposed on the upper surface and the lower surface of the layer of the gas generating agent 57, respectively.
- seal members 61 and 62 are interposed on the upper surface and the lower surface of the cooling slag collecting member 60, respectively.
- an aluminum foil 64 for covering the gas discharge orifice 53a and an aluminum foil 65 for covering the fire transmission orifice 52a were attached. It is. With such a configuration, it is possible to sufficiently withstand an increase in the internal pressure due to the gas generated in the gas generation chamber G.
- Patent Document 1 Japanese Patent Application Laid-Open No. 9-207705
- An object of the present invention is to allow a sufficient amount of a gas generating agent to be loaded into a combustion chamber while maintaining high safety of a housing, and to uniformly and efficiently burn the gas generating agent in a combustion chamber. It is to provide a gas generator which can be used.
- a gas generator includes a metal housing having an initiator shell and a closure shell, and a combustion chamber formed in the housing and loaded with a gas generating agent that generates high-temperature gas by combustion.
- a filter member arranged around the combustion chamber, an ignition means mounted on the housing for igniting and burning the gas generating agent in the combustion chamber, and a gas formed in the housing and generated in the combustion chamber.
- a gas generator having a plurality of gas discharge holes for discharging, wherein one or both of an initiator shell and a closure shell constituting the housing have a hemispherical or semi-elliptical spherical end plate portion, A cylindrical portion having a diameter D formed continuously from the end plate portion; an outer diameter D of the cylindrical portion; and a housing of each end plate portion of the initiator shell and the closure shell.
- Range of ratios HZD between the length H of the grayed is 0. a 4-1. 3
- the ignition means is provided in the housing
- An inner cylinder having a plurality of heat transfer holes and a bottom portion, a transfer agent loaded in the inner tube, and an igniter provided to be in contact with the transfer agent in the inner cylinder.
- the range of the ratio d / D between the outer diameter d of the inner cylinder and the outer diameter D of the end plate portion is 0.1-0.5.
- the housing has a hemispherical or semi-elliptical spherical end plate portion, it is difficult for stress to concentrate on the housing, and the housing is deformed due to generation of gas in the combustion chamber. Can be suppressed.
- the structure of the housing can be simplified and the number of parts can be reduced, the size and weight of the gas generator can be reduced, and the manufacturing cost can be significantly reduced.
- the outer diameter d of the inner cylinder is too large relative to the outer diameter D of the end plate portion, the volume of the combustion chamber is reduced, and the amount of the gas generating agent that can be loaded into the combustion chamber is reduced. Conversely, if the outer diameter d of the inner cylinder is too small with respect to the outer diameter D of the end plate portion, the heat flow ejected from the inner cylinder when the igniter ignites and burns the transfer agent inside the inner cylinder. May not be distributed uniformly throughout the combustion chamber, and the gas generating agent may not be efficiently burned.
- the range of the ratio d / D between the outer diameter d of the inner cylinder and the outer diameter D of the end plate portion is set to 0.1-0.5, preferably 0.15-0.3, so that the combustion chamber A sufficient amount of gas generating agent can be loaded into the combustion chamber to secure the required volume and generate the required amount of gas, and the gas generating agent in the combustion chamber can be efficiently transferred from the inner cylinder to the entire gas generating agent. It is also possible to emit a heat flow, so that the gas generating agent can be uniformly burned in the combustion chamber.
- the gas generator according to a second aspect of the present invention is the gas generator according to the first aspect, wherein a ratio h / H of a length h of the inner cylinder to a length H of the housing in a direction in which the inner cylinder extends. It is characterized by a force of 0.5-0.95. If the length h of the inner cylinder is too small with respect to the length H of the nozzle in the extension direction of the inner cylinder, when the transfer medium is ignited and burned by the igniter inside the inner cylinder, There is a risk that the heat flow that is ejected may not be distributed uniformly throughout the combustion chamber.
- the inner cylinder body extends long in the combustion chamber in the nozzle. Ignited inside the inner cylinder, from the burned combustion agent to the entire gas generant charged into the combustion chamber through a plurality of combustion holes Since the heat flow can be ejected efficiently, it is possible to uniformly burn the gas generating agent in the combustion chamber.
- a gas generator according to a third aspect of the present invention is the gas generator according to the first aspect, wherein the shape of the plurality of heat transfer holes is any one of a circular shape, an elliptical shape, a long hole shape, a rectangular shape, a diamond shape, and a trapezoidal shape. It is characterized by the following. Therefore, by providing a plurality of heat transfer holes having such a shape on the outer peripheral portion of the inner cylinder, the transfer agent ignited and burned inside the inner cylinder through the plurality of heat transfer holes. The heat flow can be injected into the combustion chamber to uniformly burn the gas generating agent in the combustion chamber.
- a gas generator according to a fourth aspect of the present invention is the gas generator according to the first aspect, wherein the number of the plurality of heat transfer holes is equal to or greater than the number. Note that the number of the plurality of heat transfer holes is preferably 8 or more. By setting the number of the plurality of transfer holes in this way, the transfer agent ignited and burned inside the inner cylinder can be efficiently transferred to the entire gas generating agent in the housing through the plurality of transfer holes. The heat flow can be ejected, and the gas generating agent can be uniformly burned in the combustion chamber.
- the gas generator according to a fifth aspect of the present invention is the gas generator according to the first aspect, wherein a ratio SA / SE of a total opening area SA of the plurality of heat transfer holes to a surface area SE of the inner cylinder is 0. 01-0. 4. If the total opening area SA of the plurality of heat transfer holes is too small with respect to the surface area SE of the inner cylinder, when the transfer medium is ignited and burned by the igniter inside the inner cylinder, the fuel flows from the inner cylinder to the combustion chamber. The heat flow is less likely to be blown out, and the heat flow may not evenly spread throughout the combustion chamber.
- the gas in the combustion chamber from the inner cylinder is reduced.
- the heat flow can be efficiently ejected to the entire generating agent, and the gas generating agent can be uniformly burned in the combustion chamber.
- the gas generator according to a sixth aspect of the present invention is the gas generator according to the first aspect, wherein a ratio SA / SD of a total opening area SA of the plurality of heat transfer holes to a total opening area SD of the plurality of gas discharge holes.
- the range power is 0.15-4.5. If the total opening area SA of the multiple vent holes is too large than the total opening area SD of the multiple gas discharge holes, the inner cylinder force will be ejected into the combustion chamber. As a result, the gas generating agent in the combustion chamber burns at once and a large amount of gas is generated instantaneously, but the gas generated in the combustion chamber is hardly released to the outside through the gas discharge holes. As a result, the pressure in the combustion chamber may be excessively increased.
- the internal cylinder force will decrease the heat flow supplied to the combustion chamber, and generate heat in the combustion chamber. If the amount of gas to be reduced becomes small, there is a possibility that a required amount of gas cannot be discharged to the outside from the plurality of gas discharge holes.
- the gas generator according to a seventh aspect of the present invention is the gas generator according to the first aspect, wherein a ratio WG / WE of the charged amount WG of the gas generating agent to the charged amount WE of the transfer agent is in a range of 10-60. It is characterized by something.
- the range of the WG / WE is preferably 15-50, and more preferably 20-45.
- the present invention is applied to a gas generator for inflating and deploying an airbag. Note that the directions of up, down, left, and right in FIG.
- a gas generator A includes a substantially spherical housing 3 composed of an initiator shell 1 and a closure shell 2 made of metal such as iron, stainless steel, aluminum, and steel, and A combustion chamber 5 that is formed inside and is loaded with a gas generating agent 4 that generates high-temperature gas by combustion, a filter member 6 placed around the combustion chamber 5, and a housing 3 And ignition means 7 for igniting and burning the gas generating agent 4 in the combustion chamber 5.
- the closure shell 2 of the housing 3 includes a cylindrical portion 9, a hemispherical end plate portion 10 formed continuously from the cylindrical portion 9, and a flange portion 12 extending radially outward from the lower end of the cylindrical portion 9. I have.
- the wall thicknesses of the shell 1 and the closure shell 2 are preferably in the range of 1.5 mm to 3 mm.
- the length of the cylindrical portion 9 is usually 5 mm or more, preferably 5 to 30 mm, more preferably 10 30 mm.
- Ratio of the length H of the housing of each of the end plates 14 and 10 of the initiator shell 1 and the closure shell 2 to the outer diameter D of the cylindrical portions 13 and 9 H / D force Normally 0.4-1.3, preferably 0 6-1.3, more preferably 1.0-1.3. If the ratio H / D is less than 0.4, the gas generator may not be assembled due to its structure. If it exceeds 1.3, the structure of the gas generator approaches the cylinder type. Therefore, by setting the thickness in such a range, even when the pressure in the gas generator 1 increases, the deformation of the housing 10 can be suppressed, and the gas generator can be downsized. .
- a plurality of circular gas discharge holes 8 are formed in the cylindrical portion 9 at predetermined intervals in the circumferential direction.
- the plurality of gas discharge holes 8 are formed in a plurality of rows, for example, two rows, three rows, or the like, or formed in a zigzag shape in which the positions in the vertical direction are shifted from each other by an amount of about half the hole diameter. It is preferred that By forming the plurality of gas discharge holes 8 in this way, the gas generated in the housing 3 is dispersed and released without being locally concentrated, so that deformation of the housing 3 can be suppressed, and Damage to the filter member 6 for gas cooling and residue filtration can also be suppressed. Further, the filter member 6 can be used in a wide range in the vertical direction and the circumferential direction, and the filter member 6 can be used efficiently.
- the diameters of the plurality of gas emission holes 8 may be appropriately combined with the gas emission holes 8 having a plurality of types of hole diameters, all of which need not be the same.
- the pressure inside the housing 3 can be adjusted by arbitrarily setting the diameter of the gas discharge holes 8. For example, by increasing the diameter of the gas discharge holes 8, it is possible to suppress a rise in pressure inside the housing 3. Further, the thickness of the closure shell 2 and the initiator shell 1 forming the housing 3 can be reduced according to the pressure in the housing 3. Further, by setting the pore size in accordance with the type of the gas generating agent 4 to be used, gas generating characteristics such as pressure and temperature can be adjusted. Further, these gas discharge holes 8 are sealed by a band-shaped member 11 such as a band-shaped aluminum tape adhered to the inner peripheral portion of the cylindrical portion 9, so that the inside of the combustion chamber 5 is sealed.
- a band-shaped member 11 such as a band-shaped aluminum tape adhered to the inner peripheral portion of the cylindrical portion 9, so that the inside of the combustion chamber 5 is sealed
- the initiator shell 1 and the closure shell 2 are provided with the hemispherical end plates 10 and 14, when the gas is generated in the combustion chamber 5 in the housing 3, the housing 3 is closed.
- the portion where stress is concentrated on the surface can be reduced as much as possible. Therefore, the deformation of the housing 3 at the time of gas generation can be made extremely small, and the structure for that can be simplified, and the number of components of the gas generator A can be reduced.
- the end plates 10 and 14 are not limited to the hemispherical shape, but may be of a semi-elliptical spherical shape. In this case, the same effect as in the case of the above-mentioned hemispherical shape can be obtained.
- a combustion chamber 5 is formed inside the housing 3, and a gas generating agent 4 is loaded in the combustion chamber 5. Then, in the combustion chamber 5, the gas generating agent 4 is burned by a heat flow from the ignition means 7 described later, and combustion gas is generated in the combustion chamber 5.
- the gas generating agent 4 is a non-azide-based composition, and for example, a gas generating agent composed of a fuel, an oxidizing agent, and additives (binder, slag forming agent, combustion regulator) can be used.
- a gas generating agent composed of a fuel, an oxidizing agent, and additives (binder, slag forming agent, combustion regulator)
- the fuel include a nitrogen-containing compound.
- the nitrogen-containing compound include one or a mixture of two or more selected from a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, a perylene derivative, and an ammine complex.
- triazole derivative examples include, for example, 5_oxo-1, 2,4_triazonole, Nottriazole and the like can be mentioned.
- tetrazole derivative examples include, for example, tetrazole, 5_aminotetrazole, aminotetrazole nitrate, nitroaminotetrazole, 5,5′_bi-1H-tetrazole, 5,5′_bi-1H-tetrazolediammonium salt , 5,5'-azotetrazole diguanidium salt and the like.
- guanidine derivative examples include, for example, guanidine, nitroguanidine, cyanoguanidine, triaminoguanidine nitrate, guanidine nitrate, aminoguanidine nitrate, guanidine carbonate and the like.
- azodicarbonamide derivative examples include, for example, azodicarbonamide.
- hydrazine derivative examples include, for example, carbohydrazide, carbohydrazide nitrate complex, oxalic acid dihydrazide, hydrazine nitrate complex, and the like.
- rare derivatives include biuret.
- ammine complex examples include a hexammine copper complex, a hexammine cobalt complex, a tetraammine copper complex, and a tetraammine zinc complex.
- nitrogen-containing compounds one or more selected from a tetrazole derivative and a guanidine derivative are preferred. preferable.
- the mixing ratio of these nitrogen-containing compounds in the gas generating agent 4 varies depending on the number of carbon atoms, hydrogen atoms and other oxidized atoms in the molecular formula. Generally, the range of 20 to 70% by weight is preferable. A range of weight% is particularly preferred.
- the absolute value of the mixing ratio of the nitrogen-containing compound varies depending on the type of the oxidizing agent added to the gas generating agent 4.
- the absolute value of the compounding ratio of the nitrogen-containing compound is greater than the theoretical amount of complete oxidation, the concentration of trace CO in the generated gas will increase, while the absolute numerical value of the compounding ratio of the nitrogen-containing compound.
- the amount is less than or equal to the amount, the concentration of trace N ⁇ x in the generated gas increases. Therefore, the range in which the optimal balance between the two is maintained is most preferable.
- the oxidizing agent is preferably an oxidizing agent selected from at least one of a nitrate, a nitrite, and a perchlorate containing a cation selected from alkali metals, alkaline earth metals, transition metals, and ammonium.
- An oxidizing agent other than nitrate that is, an oxidizing agent widely used in the field of airbag inflators, such as nitrite and perchlorate, can also be used.
- the number of oxygen in nitrite molecules is reduced as compared to nitrate. Fine powder that is easily released to Nitrate is preferred from the viewpoint of reducing the production of strike.
- nitrate examples include sodium nitrate, potassium nitrate, magnesium nitrate, strontium nitrate, phase-stabilized ammonium nitrate, and basic copper nitrate.Strontium nitrate, phase-stabilized ammonium nitrate, and basic copper nitrate are more preferred. preferable.
- the mixing ratio of the oxidizing agent in the gas generating agent 4 differs in absolute value depending on the type and amount of the nitrogen-containing compound used.
- the force is preferably in the range of 30 to 80% by weight. A range of 4075% by weight in relation to the x concentration is preferred.
- binder can be used as long as it does not significantly affect the combustion behavior of the gas generating agent.
- the binder for example, metal salts of carboxymethylcellenoylose, methinoresenololose, hydroxyethinoresenololose, cenorellose acetate, cellulose propionate, cellulose acetate butyrate, nitrocellulose, microcrystalline cellulose, guar gum, polybutyl Polysaccharide derivatives such as alcohol, polyacrylamide and starch, organic binders such as stearate, molybdenum disulfide, synthetic hydroxytalcite, acid clay, talc, bentonite, diatomaceous earth, kaolin, silica, alumina and other inorganic binders. Elevating power S
- the compounding ratio of the binder is preferably in the range of 0 to 10% by weight in the case of press molding, and is preferably in the range of 2 to 15% by weight in an extrusion mold.
- the breaking strength of the molded body increases.
- the concentration of trace CO gas which is the product of incomplete combustion of carbon atoms, increases, and the quality of generated gas decreases.
- the use of a minimum amount is preferred because it inhibits the combustion of the gas generating agent.
- the amount exceeds 15% by weight the relative proportion of the oxidant must be increased, and the relative proportion of the fuel decreases, making it difficult to establish a practical gas generator system.
- a slag forming agent can be blended as an additive other than the binder.
- the slag forming agent is added to facilitate the filtration through a filter in the gas generator due to the interaction with the metal oxide generated from the gas generating agent, particularly from the oxidizing agent component.
- the slag forming agent examples include silicon nitride, silicon carbide, acid clay, silica, and vent. From naturally occurring clay mainly composed of aluminosilicates such as knight and kaolin, synthetic mica, synthetic orinite, artificial clay such as synthetic smectite, and talc, a kind of hydrous magnesium silicate mineral Among them, acid clay or silica is preferred, and acid clay is particularly preferred.
- the mixing ratio of the slag forming agent is preferably in the range of 0 to 20% by weight, and particularly preferably in the range of 2 to 10% by weight. If the amount is too large, the line burning rate and the gas generation efficiency will decrease, and if the amount is too small, the slag forming ability cannot be sufficiently exhibited.
- Preferable combinations of the gas generating agent 4 include a gas generating agent containing 5-aminotetrazole, strontium nitrate, synthetic hydrotalcite, and silicon nitride, or guanidine nitrate, strontium nitrate, basic copper nitrate, and acid clay. And a gas generating agent containing: Moreover, you may add a combustion regulator as needed. Combustion agents such as metal oxides, silicon oxide, activated carbon, graphite, or hexogen, octogen, 5-oxo-3-nitro-1,2,4-triazole can be used as a combustion regulator. is there.
- the mixing ratio of the combustion regulator is preferably in the range of 0 to 20% by weight, and particularly preferably in the range of 2 to 10% by weight. If the amount is too large, the gas generation efficiency is reduced, and if the amount is too small, a sufficient combustion rate cannot be obtained.
- pellets, cylinders, single-hole cylinders, porous cylinders, discs, hollow bodies having both ends closed, preferably both ends are closed A cylindrical one can be used.
- the state where both ends of the molded body of the gas generating agent 4 are closed means a state where holes opened at both ends are closed by two forces from outside to inside. The hole may be either completely closed or not completely closed.
- the non-azide composition comprising the nitrogen-containing compound, the oxidizing agent, the slag forming agent, and the binder is first mixed by a V-type mixer, a ball mill, or the like. Further, mixing is performed while adding water or a solvent (eg, ethanol) to obtain a wet drug mass.
- a solvent eg, ethanol
- the wet state is a state having a certain degree of plasticity, and refers to a state in which water or a solvent is contained preferably at 1025% by weight, more preferably at 1318% by weight.
- the wet medicine mass is directly extruded (e.g., die And an inner hole pin provided at the outlet), the outer diameter is preferably 1.4 mm to 4 mm, more preferably 1.5 mm to 3.5 mm, and the inner diameter is preferably 0.3 mm to 1 mm. It is extruded into a hollow cylindrical molded body having a diameter of 2 mm, more preferably 0.5 mm to 1.2 mm. Thereafter, the hollow cylindrical molded body extruded by the extruder is pressed at regular intervals to obtain a cylindrical molded body having both ends closed.
- this hollow cylindrical molded body is pressed at regular intervals, cut in such a way that it is folded at each closed dent, usually dried at 50-60 ° C for 4-10 hours, and then dried.
- this hollow cylindrical molded body is pressed at regular intervals, cut in such a way that it is folded at each closed dent, usually dried at 50-60 ° C for 4-10 hours, and then dried.
- by performing drying in two stages of drying at 105 to 120 ° C for 6 to 10 hours it is possible to obtain a tubular gas generating agent having a space inside with the end closed. it can.
- the length of the gas generant thus obtained is usually
- It is in the range of 1.5-8 mm, preferably in the range of 1.5-7 mm, more preferably in the range of 26.5 mm.
- the linear burning speed of the gas generating agent 4 is measured under a constant pressure condition, and empirically complies with the following Dahlle equation.
- r is the linear burning rate
- a is a constant
- P is the pressure
- n is the pressure index.
- the pressure index n indicates the slope of the logarithmic plot of the pressure on the X-axis against the logarithm of the burning velocity on the Y-axis.
- a preferred range of the linear burning rate of the gas generating agent used in the gas generator according to the present embodiment is 3 to 60 mm / sec under 70 kgf / cm 2 , more preferably 5 to 35 mm / sec.
- Examples of the method for measuring the linear burning velocity include a strand burner method, a small motor method, and a closed pressure vessel method. Specifically, after press-molding to a predetermined size, the burning rate is measured in a high-pressure vessel by a fuse cutting method or the like using a test piece obtained by applying a restrictor to the surface. At this time, the linear combustion rate is measured using the pressure in the high-pressure vessel as a variable, and the above Dahlle's equation force-pressure index can be obtained.
- a filter member 6 is provided in the housing 3 formed of the closure shell 2 and the initiator shell 1 along the inner walls of the tubular portions 9 and 13.
- the filter member 6 is, for example, It is inexpensively manufactured by forming an assembly of a spun knit wire mesh, a plain woven wire mesh, a crimp-woven metal wire or a wound metal wire into an annular shape.
- the filter member 6 is pressed against the inner wall side of the housing 3 by pressing members 20, 21 provided on the inner surfaces of the end plates 10, 14 of the closure shell 2 and the initiator shell 1, respectively.
- a filter holding member 24 is provided in the outer peripheral portion of the filter member 6 around the gas discharge hole 8.
- the filter pressing member 24 is formed by forming a plate-like member having a plurality of holes, which is called a so-called punching metal, in a ring shape.
- a cushion member 22 is provided on the inner surface of the end plate 10 of the closure shell 2.
- These cushion members 22 are made of, for example, ceramic fiber, foamed silicon, or the like, and cracks of the gas generating agent 4 loaded in the combustion chamber 5 due to vibration applied from the outside. Prevent the destruction of the etc.
- the ignition means 7 is provided at the center of the end plate 14 of the initiator shell 1, and the ignition means 7 is provided in the housing 3 and has a plurality of heat transfer holes 15 and an inner cylindrical body having a bottom 25. 16, a transfer agent 17 loaded in the inner cylinder 16, and an igniter 18 provided in the inner cylinder 16 so as to be in contact with the transfer agent 17.
- the transfer agent 17 is used to reliably start the combustion of the gas generating agent 4 in the combustion chamber 5, and the transfer agent 17 may be a commonly used B / KNO. Be represented
- a composition comprising a metal powder and an oxidizing agent, a nitrogen-containing compound, a composition containing an oxidizing agent and a metal powder, or a gas generating composition can be used.
- each component in the heat transfer agent 17 is preferably in the range of 110 to 30% by weight for the metal powder component and 70 to 95% by weight for the oxidizer component when the metal powder and the oxidizer are included.
- the metal powder component should preferably be in the range of 110 to 30% by weight
- the nitrogen-containing compound should be in the range of 40% by weight
- the oxidizing agent component should be in the range of 50 to 90%.
- the composition may contain 0 to 10% by weight of a molding binder usable as a gas generating agent.
- a molding binder a binder generally usable for a gas generating agent can be used. .
- Examples of the shape of the transfer agent 17 include a granular shape, a granular shape, a pellet shape (generally corresponding to the shape of a pharmaceutical tablet), a columnar shape, a cylindrical shape, a disk shape, and the like.
- the cylindrical shape includes, for example, a cylindrical shape, and the cylindrical shape includes, for example, a single-hole cylindrical shape, a porous cylindrical shape, and the like.
- Examples of the production method include powder mixing, granulation methods (stirring granulation, spray drying granulation, extrusion granulation, tumbling granulation, compression granulation, etc.), tablet compression molding method, and the like.
- the inner cylinder 16 is fixed to the end plate 14 of the initiator shell 1 by an arbitrary method such as caulking.
- the inner cylinder 16 is formed in a long cylindrical shape extending upward from a lower end of the combustion chamber 5 formed in the housing 3.
- the heat flow generated when the transfer agent 17 is ignited and burned inside the inner cylinder 16 is transferred to the combustion chamber 5 on the outer circumference of the inner cylinder 16, preferably around the portion where the igniter 18 is not housed.
- a plurality of heat transfer holes 15 for discharging are formed.
- the outer diameter d of the inner cylindrical body 16 is too large with respect to the outer diameter D (outer diameter of the housing) of the end plate portion 14, the volume of the combustion chamber 5 is reduced, and the gas that can be charged into the combustion chamber 5 is reduced. The amount of generator 4 is reduced. Conversely, if the outer diameter d of the inner cylinder 16 is too small with respect to the outer diameter D of the end plate portion 14, when the transfer medium 17 is ignited and burned by the igniter 18 inside the inner cylinder 16, Body 16 force There is a possibility that the jetted heat flow may not be distributed uniformly throughout the combustion chamber 5.
- _ttd / D between the outer diameter d of the inner cylindrical body 16 and the outer diameters D of the end plates 10 and 14 is set to 0.1-0.5, preferably 0.15-0.3.
- the part where the igniter 18 is not accommodated has a bottom part 25.
- the igniter 18 When the transfer medium 17 is ignited and burned, the heat flow spouted from the inner cylinder 16 may not be distributed uniformly throughout the combustion chamber 5. Therefore, the range of the ratio hZH between the height h of the inner cylinder 16 (length in the extension direction) and the height of the housing 3 (length of the extension of the inner cylinder 16 in the extension direction) H is 0.5-0. 95, preferably 0.65-0.9.
- the gas generating agent 4 can be loaded into the combustion chamber 5, and the heat flow can be efficiently ejected from the inner cylinder 16 to the entire gas generating agent 4 in the combustion chamber 5.
- Generator 4 is evenly burned,
- the bag can be rapidly inflated and deployed.
- the number of the plurality of heat transfer holes 15 is 4 or more, preferably 8 or more, and more preferably 8 to 28.
- the gas generator A of the present embodiment is used.
- the system IJ of the heat transfer hole 15 composed of five or six circular heat transfer holes 15 arranged vertically is divided into four equal parts in the circumferential direction of the inner cylinder 16. Four rows are formed at each position, one row each.
- the rows of the heat transfer holes 15 can be formed one by one at three to five equal positions in the circumferential direction of the inner cylinder body 16, but as shown in FIG. Each row is preferably formed one by one.
- FIG. 1 the system IJ of the heat transfer hole 15 composed of five or six circular heat transfer holes 15 arranged vertically is divided into four equal parts in the circumferential direction of the inner cylinder 16.
- Four rows are formed at each position, one row each.
- the rows of the heat transfer holes 15 can be formed one by one at three to five equal positions in the circumferential direction of the inner cylinder body 16, but as shown in FIG.
- the rows of the heat transfer holes 15 adjacent in the circumferential direction are formed to be slightly shifted vertically (for example, by the hole diameter of the heat transfer holes 15).
- the hole diameter is preferably 3.5 to 4.5 mm.
- the shape of the plurality of heat transfer holes 15 is not limited to a circular shape as shown in FIG. 1, but may be various shapes such as an elliptical shape, a long hole shape, a rectangular shape, a diamond shape, or a trapezoidal shape.
- the transfer agent 17 leaks from the inner cylinder 16, and conversely, becomes smaller. If it is too long, when the transfer medium 17 is ignited and burned by the igniter 18 inside the inner cylinder 16, it becomes difficult for the heat flow to be ejected from the inner cylinder 16 to the combustion chamber 5, and the heat flow becomes uniform throughout the combustion chamber 5 There is a possibility that it will not be distributed.
- the surface area SE of the inner cylinder 16 may be only the area of the outer circumference of the inner cylinder 16 or may be the sum of the area of the outer circumference of the inner cylinder 16 and the area of the bottom 25.
- the range of SA / SE is set to 0.01 to 0.4, preferably to 0.02 to 0.30, and more preferably to 0.08 to 0.20.
- the transfer agent 17 can be reliably loaded into the inner cylinder 16, and the efficiency of the gas generating agent 4 in the combustion chamber 5 from the inner cylinder 16 to the entirety can be improved.
- the heat flow can be well jetted out, and the gas generating agent can be uniformly burned in the combustion chamber 5.
- the range of SA / SD is set to 0.15-4.5, preferably to 0.33.5, and more preferably to 0.5-3.0.
- the ratio WG / WE between the above-described loading amount WG of the gas generating agent 4 and the loading amount WE of the transfer agent 17 in the inner cylinder 16 is set to 10-60, preferably 15-50, Preferably it is 20-45.
- the gas generator A described above is mainly incorporated in an airbag module to be mounted in the instrument panel on the passenger seat side as a one-tube gas generator. After being incorporated in the airbag module, the ignition means 7 of the gas generator A is connected to a vehicle-side connector (not shown). It is of course possible to apply the gas generator A to an airbag module on the driver's seat side.
- the collision sensor provided in the automobile detects the collision of the automobile and the ignition means 7 is activated by the squib ignition circuit connected to the ignition means 7, the inner cylinder 16
- the transfer agent 17 charged in the fuel cell is ignited and burned, and a heat flow is ejected from the inner cylinder body 16 to the combustion chamber 5 through the plurality of transfer holes 15.
- the outer diameter of the housing 3, the outer diameter of the inner cylindrical body 16, the hole diameters and the number of the plurality of heat transfer holes 15 and their arrangement, and the loading amounts of the gas generating agent 4 and the transfer agent 17 are described above.
- the contents of the combustion chamber 5 A sufficient amount of gas generating agent 4 can be loaded into the combustion chamber to secure the product and generate the required amount of gas. Furthermore, since the heat flow can be efficiently ejected from the inner cylinder 16 to the entire gas generating agent 4 in the combustion chamber 5, the gas generating agent 4 can be uniformly burned in the combustion chamber 5. Become like
- the gas generating agent 4 in the combustion chamber 5 burns to generate high-temperature gas in the combustion chamber 5.
- the pressure in the combustion chamber 5 increases, but since the housing 3 has a substantially spherical shape, it has a strength enough to withstand the pressure increase in the combustion chamber 5 and its deformation is extremely small. Then, the high-temperature gas generated in the combustion chamber 5 passes through the filter member 6, breaks the rupture member 11, and is discharged into the gas discharge holes 8.
- the filter member 6 when the high-temperature gas passes through the filter member 6, the gas is cooled by the filter member 6, and at the same time, the residue in the gas is filtered. Further, since the filter member 6 is provided over substantially the entire area of the combustion chamber 5, the filter member 6 can be effectively used. Therefore, the gas is sufficiently cooled by the filter member 6 and the gas whose residue is sufficiently filtered can be discharged from the gas discharge holes 8.
- gas generator according to the present invention will be described specifically, but is not limited to the following.
- the outer diameter D of the end plate 10 is 70 mm
- the length H of the housing 3 is 75 mm
- the diameter of the gas discharge holes 8 is 2.6 mm
- the number of the gas discharge holes 8 is 20.
- the total opening area SD of the gas discharge holes 8 was 106 mm 2 .
- the length h of the inner cylinder 16 was 62 mm
- the outer diameter d of the inner cylinder 16 was 12 mm
- the surface area SE of the inner cylinder 16 was 3700 mm 2 .
- the shape of the flame-transferring hole 15 is circular shape, 22 a number of flame-transferring hole 15, the diameter of the flame-transferring hole 15 as 4. 0 mm, and the total opening area SA of flame-transferring holes 15 and 276 mm 2 .
- the loading amount WG of the gas generating agent 4 was 90 g
- the loading amount WE of the transfer agent 17 was 3.8 g.
- FIG. 1 is a sectional view of a gas generator according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of a conventional gas generator.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Bags (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/567,024 US20070063494A1 (en) | 2003-08-06 | 2004-08-05 | Gas producer |
EP04771258A EP1661774A4 (en) | 2003-08-06 | 2004-08-05 | GAS PRODUCTION SYSTEM |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-287405 | 2003-08-06 | ||
JP2003287405A JP4180993B2 (ja) | 2003-08-06 | 2003-08-06 | ガス発生器 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005014344A1 true WO2005014344A1 (ja) | 2005-02-17 |
Family
ID=34131483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/011231 WO2005014344A1 (ja) | 2003-08-06 | 2004-08-05 | ガス発生器 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070063494A1 (ja) |
EP (1) | EP1661774A4 (ja) |
JP (1) | JP4180993B2 (ja) |
CN (1) | CN1863696A (ja) |
WO (1) | WO2005014344A1 (ja) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100445137C (zh) * | 2002-02-06 | 2008-12-24 | 日本化药株式会社 | 气体发生器 |
CN1863695A (zh) * | 2003-08-06 | 2006-11-15 | 日本化药株式会社 | 气体发生器 |
JP4280161B2 (ja) * | 2003-12-22 | 2009-06-17 | ダイセル化学工業株式会社 | エアバッグ用ガス発生器 |
JP4907931B2 (ja) | 2005-09-15 | 2012-04-04 | 日本化薬株式会社 | ガス発生器 |
US7503581B2 (en) | 2006-03-22 | 2009-03-17 | Daicel Chemical Industries, Ltd. | Gas generator for occupant restraining device for vehicle |
JP4970813B2 (ja) | 2006-03-22 | 2012-07-11 | 株式会社ダイセル | 車両の人員拘束装置用ガス発生器 |
US20090115174A1 (en) * | 2007-11-06 | 2009-05-07 | Autoliv Asp, Inc. | Slotted/tapered filter |
DE102008029591B4 (de) * | 2008-06-23 | 2022-03-03 | Zf Airbag Germany Gmbh | Herstellungsverfahren für einen Gasgenerator mit Multifunktionsfilter |
JP2012504073A (ja) * | 2008-09-30 | 2012-02-16 | ティーアールダブリュー・エアバッグ・システムズ・ゲーエムベーハー | インフレータ、インフレータを製造する方法、およびこのインフレータを含むモジュール |
JP5016619B2 (ja) * | 2009-01-15 | 2012-09-05 | 株式会社ダイセル | 車両の人員拘束装置用ガス発生器 |
JP5324931B2 (ja) | 2009-01-15 | 2013-10-23 | 株式会社ダイセル | 車両の人員拘束装置用ガス発生器 |
JP5016620B2 (ja) | 2009-01-15 | 2012-09-05 | 株式会社ダイセル | 車両の人員拘束装置用ガス発生器 |
JP5324930B2 (ja) | 2009-01-15 | 2013-10-23 | 株式会社ダイセル | 車両の人員拘束装置用ガス発生器 |
US8162350B1 (en) * | 2010-10-07 | 2012-04-24 | Autoliv Asp, Inc. | Gas generator |
US8684405B2 (en) | 2012-05-17 | 2014-04-01 | Arc Automotive Inc. | Grain retainer construction for air bag inflator |
US10010447B2 (en) | 2013-12-18 | 2018-07-03 | Novartis Ag | Systems and methods for subretinal delivery of therapeutic agents |
CN104744185B (zh) * | 2013-12-30 | 2017-11-17 | 比亚迪股份有限公司 | 一种气体发生剂组合物及其制备方法 |
JP6683455B2 (ja) * | 2015-10-23 | 2020-04-22 | 日本化薬株式会社 | ガス発生器 |
JP2017149228A (ja) * | 2016-02-23 | 2017-08-31 | 日本化薬株式会社 | ガス発生器 |
JP6714495B2 (ja) * | 2016-11-10 | 2020-06-24 | 株式会社ダイセル | ガス発生器 |
CN107956500A (zh) * | 2017-12-12 | 2018-04-24 | 中国矿业大学 | 一种气囊式主动抑爆隔爆装置及方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05138007A (ja) * | 1991-11-14 | 1993-06-01 | Nippon Koki Kk | エアバツグ展開用ガス発生装置 |
JPH09207705A (ja) | 1995-11-28 | 1997-08-12 | Nippon Kayaku Co Ltd | エアバッグ用ガス発生器及びその組立方法 |
JPH09226509A (ja) * | 1996-02-27 | 1997-09-02 | Nippon Kayaku Co Ltd | エアバッグ用ガス発生器及びその製造方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4907819A (en) * | 1988-09-16 | 1990-03-13 | Talley Automotive Products, Inc. | Lightweight non-welded gas generator with rolled spun lip |
US5643345A (en) * | 1995-09-18 | 1997-07-01 | Morton International, Inc. | Automotive air bag filter with support member |
JP3425319B2 (ja) * | 1997-02-10 | 2003-07-14 | ダイセル化学工業株式会社 | エアバッグ用ガス発生器及びエアバッグ装置 |
US6135496A (en) * | 1997-05-09 | 2000-10-24 | Daicel Chemical Industries, Ltd. | Gas generator for air bag and air bag system |
JP2926040B2 (ja) * | 1997-05-09 | 1999-07-28 | ダイセル化学工業株式会社 | エアバッグ用ガス発生器及びエアバッグ装置 |
DE19726296A1 (de) * | 1997-06-20 | 1998-12-24 | Temic Bayern Chem Airbag Gmbh | Gasgenerator mit Kühlvorrichtung |
DE19742204B4 (de) * | 1997-09-24 | 2006-07-13 | Trw Airbag Systems Gmbh & Co. Kg | Gasgenerator für eine Sicherheitseinrichtung |
US6213501B1 (en) * | 1998-03-19 | 2001-04-10 | Autoliv Asp, Inc. | Method of improving ballistics by ignition system porting in an airbag inflator |
JP2000016226A (ja) * | 1998-06-26 | 2000-01-18 | Daicel Chem Ind Ltd | エアバッグ用ガス発生器及びエアバッグ装置 |
US6123359A (en) * | 1998-07-25 | 2000-09-26 | Breed Automotive Technology, Inc. | Inflator for use with gas generant compositions containing guanidines |
KR100490243B1 (ko) * | 1999-07-28 | 2005-05-17 | 니뽄 가야쿠 가부시키가이샤 | 가스발생기 |
CN100445137C (zh) * | 2002-02-06 | 2008-12-24 | 日本化药株式会社 | 气体发生器 |
-
2003
- 2003-08-06 JP JP2003287405A patent/JP4180993B2/ja not_active Expired - Fee Related
-
2004
- 2004-08-05 US US10/567,024 patent/US20070063494A1/en not_active Abandoned
- 2004-08-05 CN CNA2004800291868A patent/CN1863696A/zh active Pending
- 2004-08-05 WO PCT/JP2004/011231 patent/WO2005014344A1/ja active Application Filing
- 2004-08-05 EP EP04771258A patent/EP1661774A4/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05138007A (ja) * | 1991-11-14 | 1993-06-01 | Nippon Koki Kk | エアバツグ展開用ガス発生装置 |
JPH09207705A (ja) | 1995-11-28 | 1997-08-12 | Nippon Kayaku Co Ltd | エアバッグ用ガス発生器及びその組立方法 |
JPH09226509A (ja) * | 1996-02-27 | 1997-09-02 | Nippon Kayaku Co Ltd | エアバッグ用ガス発生器及びその製造方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1661774A4 * |
Also Published As
Publication number | Publication date |
---|---|
JP4180993B2 (ja) | 2008-11-12 |
JP2005053382A (ja) | 2005-03-03 |
EP1661774A4 (en) | 2006-11-29 |
US20070063494A1 (en) | 2007-03-22 |
EP1661774A1 (en) | 2006-05-31 |
CN1863696A (zh) | 2006-11-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4490919B2 (ja) | ガス発生器 | |
JP4136944B2 (ja) | ガス発生器 | |
WO2005014344A1 (ja) | ガス発生器 | |
JP4257740B2 (ja) | ガス発生器 | |
WO2000018619A1 (fr) | Corps moule forme d'une composition d'agent generateur de gaz, pour airbags | |
JP4490920B2 (ja) | ガス発生器の取付構造及びエアバッグモジュール | |
EP2190801A2 (en) | Multi-composition pyrotechnic grain and related method of forming | |
WO2005123631A1 (ja) | ガス発生装置用の着火剤 | |
JP4514024B2 (ja) | 伝火薬成形体及びこれを有するガス発生器 | |
JP5391440B2 (ja) | パイロ型ガス発生器及びガス発生剤組成物の成型体 | |
JP3267546B2 (ja) | エアバッグ用ガス発生器及びエアバッグ装置 | |
JP2960388B2 (ja) | エアバッグ用ガス発生剤組成物成型体 | |
JP4682543B2 (ja) | ガス発生器用の着火剤 | |
JP2001206189A (ja) | エアバッグ用ガス発生器及びエアバッグ装置 | |
WO2004080767A1 (ja) | ガス発生器 | |
JP2005313752A (ja) | ガス発生器 | |
JPH10182275A (ja) | エアバッグ用ガス発生器及びエアバッグ装置 | |
JP4682542B2 (ja) | ガス発生器用の着火剤 | |
JP2000026189A (ja) | エアバッグ用ガス発生剤組成物成型体 | |
JPH11189125A (ja) | エアバッグ用ガス発生器及びエアバッグ装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200480029186.8 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2004771258 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2004771258 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2007063494 Country of ref document: US Ref document number: 10567024 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 10567024 Country of ref document: US |