JP4257740B2 - Gas generator - Google Patents

Description

  The present invention relates to a gas generator suitable for inflating a side airbag or the like, and more particularly to a gas generator that is small, lightweight, inexpensive, and has little variation in combustion performance.

  An air bag is known as one of safety devices for protecting an occupant from an impact generated when a car collides. This airbag operates with a large amount of high temperature and high pressure gas generated from a gas generator. Conventionally, two types of methods for generating gas from this gas generator are known. One is a hybrid system that includes a cylinder filled with a high-pressure gas and includes a small amount of explosive composition that supplies heat to the high-pressure gas released from the cylinder (see, for example, Patent Document 1). The other is a pyro type in which a solid gas generating agent is burned to release a large amount of high-temperature / high-pressure gas (see, for example, Patent Documents 2-6).

JP-A-8-253100 WO 01/74633 Publication Pamphlet JP 2002-362298 A JP 2002-362299 A JP 2003-2153 A WO 03/42010 Publication Pamphlet

  In recent years, the performance required for gas generators includes downsizing and low cost. However, for example, the one described in Patent Document 1 is a hybrid system, and therefore requires two chambers, a gas filling chamber and an explosive composition chamber, which increase in size and weight. In addition, the welding structure is mainly used, which increases the cost.

  The pyro-type gas generator described as a known technique in Patent Document 2 has a partition plate, a filter chamber, a combustion chamber, a cushioning material, and an igniter in this order in the direction from the bottom of the housing toward the open end. is doing. However, when a gas generating agent that is difficult to burn is used in this gas generator, the thermal power of the igniter is insufficient and satisfactory combustion performance is not exhibited.

Moreover, the pyro-type gas generator described in Patent Documents 3-5 includes an enhancer cup having a filter chamber, a partition plate, a combustion chamber, a cushion material, and an igniter in a cylindrical housing, and further filled with an enhancer agent molded body. Is used. The outside of the enhancer cup is filled with a gas generating agent molded body . In this gas generator, since the enhancer agent molded body covers the shortage of thermal power of the igniter, satisfactory combustion performance is exhibited. However, since the enhancer cup is used, the number of parts increases, and the gas generator has not been reduced in size and weight. Further, it takes time to fix the cup body, and there is a limit to cost reduction. If the enhancer cup is not used, the enhancer agent molded body and the gas generating agent molded body are confused and the combustion performance is reduced.

Further, Patent Document 6 includes a combustion chamber having a filter material, a cushion material, and an igniter in FIG. 1, and is formed into a ring shape whose diameter is slightly smaller than the inner diameter of the cylindrical housing. A pyro-type gas generator is described in which the formed enhancer agent molded body is disposed in a combustion chamber. However, when the enhancer agent molded body formed into a ring shape is broken by the flame of the igniter, the shape of the enhancer agent molded body after the breakage is different for each gas generator, so that the combustion performance is considered to vary. As a result, it is difficult to obtain a product with a certain quality. In addition, since two types of cushion materials, a ring shape with a large diameter and a circular shape with a small diameter, are used, the number of parts increases and there is a limit to cost reduction. In FIG. 2, a pyro-type gas generator having a filter chamber, a partition plate, a combustion chamber, a cushion material, and an igniter in a cylindrical housing, and an enhancer agent molded body disposed between the cushion material and the igniter. Is described. However, this gas generator also has a variation in combustion performance, and it is difficult to obtain a product with a certain quality. While the arrangement position of the enhancer agent compact is determined, the filling state of the gas generant compact is slightly different for each gas generator, and the position of the end of the gas generant compact on the igniter side is the gas generator. This is considered to be slightly different for each. That is, the distance between the enhancer agent molded body and the gas generant molded body is slightly different for each gas generator, and the ignition of the gas generant molded body due to the flame generated from the enhancer agent molded body varies depending on the gas generator. It is thought that. Moreover, since the holder which holds an enhancer agent molded object is used, the number of parts increases and there is a limit in cost reduction.

The present invention has been made in view of the above problems, and can be reduced in size, weight, and cost, and can reliably ignite and stably burn the gas generant molded body. It is an object of the present invention to provide a gas generator that can be produced, and to provide a gas generator of a certain quality with little variation in combustion performance.

The gas generator of the present invention has the open end 3,53 in the bottomed cylindrical housing 4,54,104,204,304,404 having the open end 3,53,103,203,303,403. , 103, 203, 303, 403, filter materials 7, 47 in a direction from the end portions 2, 52, 102, 202, 302, 402 toward the open end portions 3, 53, 103, 203, 303, 403. , 107 are installed in the combustion chambers 6, 106, 206, 306, 406 having filter chambers 8, 108, 208, 308, 408, a plurality of gas generant molded bodies 5, 105, and a plurality of enhancer agent molded bodies 14. When, a first partition member 15 made of a cushioning material, the igniter 10, a gas generator 1,40,50,101,201,301,401 arranged in this order Wherein the combustion chamber (6,106,206,306,406) within the multiple enhancer agent molded article 14 is the first partition member 15 side, the plurality of gas generating agent molded article 5,105 is the filter chamber The plurality of enhancer agent molded bodies (14) and the plurality of gas generant molded bodies (5, 105) are disposed adjacent to each other on the 8 , 108, 208, 308 , and 408 sides , and Prevent mixing of the plurality of gas generating agent molded bodies 5, 105 and the plurality of enhancer agent molded bodies 14 between the gas generating agent molded bodies 5, 105 and the plurality of enhancer agent molded bodies 14. A separation sheet 35 made of a wire mesh or expanded metal is loosely inserted .

  Here, “arranged in this order” means that the filter chambers 8, 108, 208, 308, 408, the combustion chambers 6, 106, 206, 306, 406, the first partition member 15 and the igniter 10 are relative to each other. Mean order. Therefore, for example, the case where other members are arranged between the filter chambers 8, 108, 208, 308, 408 and the combustion chambers 6, 106, 206, 306, 406 is included.

By adopting such a configuration, the plurality of enhancer agent molded bodies 14 and the plurality of gas generant molded bodies 5 and 105 are not mixed, and the plurality of gas generant molded bodies 5 are merely passed through the separation sheet 35. 105 and the plurality of enhancer agent molded bodies 14 can be arranged adjacent to each other. Therefore, there is a low possibility that the combustion performance will vary. Furthermore, it is possible to reduce the size, weight, and cost.

In the present invention, the gas generant molded body 5,105 is preferably a molded body having a hollow portion with a diameter of 1.4 to 4.0 mm and a length of 1.5 to 8.0 mm closed at both ends. . Further, the gas generating agent molded body 5, diameter 2.0～8.0Mm, length 0.5~4.0mm of pellets, it is preferable cylindrical, a cylindrical or disk-shaped body .

Although the combustion curve varies depending on the shape of the gas generant molded bodies 5 and 105, a gas generator having a desired gas generation curve can be obtained with such a configuration. Furthermore, since the gas generating agent molded bodies 5 and 105 having a columnar shape, a cylindrical shape, or a hollow body shape in which both ends are closed have a high combustion speed, a faster airbag can be deployed.

In the present invention, the enhancer agent molded body 14 is preferably a pellet-shaped, cylindrical-shaped, disk-shaped, hollow-shaped or cylindrical molded body with both ends closed.

By using such a configuration, that is, the enhancer agent molded body 14 as the above-described molded body, a large number of enhancer agent molded bodies 14 having a constant shape can be filled. Further, the molded body is not destroyed by the flame of the igniter 10. Therefore, it is unlikely that the combustion performance varies.

In the present invention, the enhancer agent molded body 14 is preferably a molded body having a diameter of 1 to 10 mm and a length of 1 to 10 mm.

The combustion curve of the gas generant molded bodies 5 and 105 can be finely adjusted by the shape of the enhancer agent molded body 14. Therefore, a gas generator having a desired gas generation curve can be obtained by such a configuration.

In the present invention, the separation sheet 35, either a wire mesh or expanded Metall.

With this configuration, it is possible to reduce the size and weight. Further, since the separation sheet 35 is simply placed after the gas generating agent molded bodies 5 and 105 are filled when the gas generator 1 is manufactured, cost reduction can be realized.

In the present invention, the first partition member 15 and the cushion material.

With such a configuration, due to vibration or impact can be prevented powdering of d Nhansa agent molded article 14.

  In the present invention, it is preferable that gas discharge holes 11 and 51 for discharging gas are provided along the circumferential direction of the housings 4 and 54 forming the filter chamber 8.

  With such a configuration, the generated gas can be reliably discharged from the gas generators 1, 40 and 50 via the filter materials 7 and 47. In addition, when the gas discharge holes 11 and 51 are provided along the circumferential direction of the housings 4 and 54, the gas is discharged radially rather than in the axial direction of the gas generator, and no thrust is generated in the axial direction. Is preferable.

In the present invention, the filter material 107 disposed in front Symbol filter chamber 108, 208, 308, 408 is a cylindrical, the open end with respect to the filter chamber 108, 208, 308, 408 103, 203 , 303, 403, gas discharge chambers 130, 230, 330, 430 for discharging gas that has passed through the filter material 107 are provided on the end portions 102, 202, 302, 402 side different from the gas discharge chamber 130. , 230, 330, 430 are preferably provided with gas discharge holes 111, 211, 311, 411 along the circumferential direction of the housings 104, 204, 304, 404.

  With such a configuration, the gas generated in the combustion chambers 106, 206, 306, 406 can be released from the gas generators 101, 201, 301, 401 via the columnar filter material 107. Therefore, the filter material 107 can be used efficiently and there is little loss. Further, since the gas discharge holes 111, 211, 311, and 411 are provided along the circumferential direction of the housings 104, 204, 304, and 404, the gas is discharged radially rather than in the axial direction of the gas generator. There will be no driving force.

  In the present invention, there are further provided second partition members 9 and 309 in which holes 18 and 309 a sealed with seal members 16 and 316 are formed between the filter chambers 8 and 308 and the combustion chambers 6 and 306. It is preferable.

By adopting such a configuration, it is possible to prevent moisture absorption of the gas generating agent molded bodies 5 and 105 and the enhancer agent molded body 14 with a simple configuration. That is, since it is not necessary to seal the gas discharge holes 11, 51, 311, the number of sealing portions is reduced, and the cost of the sealing members 16, 316 and the manufacturing cost of the gas generator can be reduced.

  In the present invention, a third hole (18) sealed with a sealing member (16) is formed between the gas discharge chamber (130, 230, 430) and the filter chamber (108, 208, 408). It is preferable to further have a partition member (120).

Even with such a configuration, moisture absorption of the gas generating agent molded body 105 and the enhancer agent molded body 14 can be prevented with a simple configuration. Therefore, the cost of the sealing member 16 and the manufacturing cost of the gas generator can be reduced as described above.

  In the present invention, it is preferable that the second partition members 9 and 309 are fixed by caulking from the outer peripheral portions of the housings 4, 54 and 304.

  By adopting such a configuration, there is no need for a process of notching the outer peripheral end face of the conventional partition member and mounting a seal material such as an O-ring, so the cost is low and the partition member and the housing It is possible to obtain a highly airtight gas generator.

  An example of the first embodiment of the gas generator according to the present invention will be described with reference to FIG. In FIG. 1, the gas generator 1 has an end different from the open end 3 of the housing 4 in a bottomed cylindrical housing 4 in which one end (hereinafter referred to as “open end”) 3 is open. A filter chamber 8, a combustion chamber 6, and an igniter 10 are arranged in this order in a direction from the portion (hereinafter referred to as “bottom portion”) 2 toward the open end 3. The filter chamber 8 and the combustion chamber 6 are partitioned by the second partition member 9, and the combustion chamber 6 and the igniter 10 are partitioned by the first partition member 15.

  In the filter chamber 8, the filter material 7 is disposed with a predetermined gap between the filter chamber 8 and the inner wall of the housing 4 that forms the filter chamber 8. A plurality of gas discharge holes 11 penetrating the filter chamber 8 are provided along the circumferential direction on the outer periphery of the housing 4 forming the filter chamber 8. Thus, by providing the gas discharge holes 11 along the circumferential direction of the housing 4, the gas is discharged radially instead of in the axial direction of the gas generator. Accordingly, no thrust is generated in the axial direction, and the influence on the airbag can be reduced.

  The igniter 10 is attached to the open end 3 of the housing 4 toward the combustion chamber 6.

The second partition member 9 has a disk shape having a hole 18 at the center. The hole 18 is sealed with the seal member 16. As a result, it is not necessary to seal the gas discharge hole 11, so that the cost can be reduced. The second partition member 9 is fixed by caulking from the outer peripheral portion of the housing 4. By doing so, the process of notching the outer peripheral end face of the second partition member 9 and mounting a sealing material such as an O-ring is not required, and therefore it is possible to provide a gas generator with low cost and high airtightness. . In addition, by dividing the combustion chamber 6 and the filter chamber 8 by the second partition member 9, it is possible to reduce the melting of the filter material 7 due to the combustion heat of the gas generant molded body 5.

The first partition member 15 has a disk shape and has a cushioning action. That is, to prevent powder of the gas generating agent molded article 5 or enhancer agent molded article 14 due to vibrations or the like.

In the combustion chamber 6, a plurality of gas generating agent molded bodies 5 and a plurality of enhancer agent molded bodies 14 are filled in this order from the second partition member 9 toward the first partition member 15. Further, the inside of the combustion chamber 6 is separated into two layers, a layer filled with the gas generating agent molded body 5 and a layer filled with the enhancer agent molded body 14 by the separation sheet 35. Specifically, the layer on the second partition member 9 side (that is, the filter chamber 8 side) is filled with the gas generating agent molded body 5, and the layer on the first partition member 15 side is filled with the enhancer agent molded body 14. Yes. Thus, since the gas generating agent molded body 5 and the enhancer agent molded body 14 are separated by the separation sheet 35, the both 5 and 14 do not mix in the combustion chamber 6. Moreover, since both 5 and 14 are closely_contact | adhered via the separation sheet 35, the combustion performance of the gas generator 1 can be stabilized. The use ratio between the enhancer agent molded body 14 and the gas generating agent 5 molded body is appropriately determined as necessary, but the weight ratio of the plurality of enhancer agent molded bodies 14 and the plurality of gas generant 5 molded bodies is 1. It is preferably in the range of / 5 to 1/10. The gas generant molded body 5 is manufactured by press molding or extrusion molding, preferably extrusion molding.

The gas generating agent molded body 5 is manufactured by press molding or extrusion molding, more preferably extrusion molding. Examples of the shape include a pellet shape (generally corresponding to the shape of a tablet which is one shape of a pharmaceutical), a columnar shape, a cylindrical shape, a disk shape, or a hollow body shape in which both ends are closed. The cylindrical shape includes a cylindrical shape, and the cylindrical shape includes a single-hole cylindrical shape and a porous cylindrical shape. The hollow body shape with both ends closed includes a cylindrical shape with both ends closed. In addition, the state where both ends of the gas generating agent molded body 5 are closed means a state where the holes opened at both ends are closed by two forces from the outside to the inside. The hole may be either completely closed or not fully closed.

In the case where the gas generant molded body 5 has a hollow body shape with both ends closed, an example of the production method is an extrusion molding method. This extrusion method will be described. The non-azide composition composed of the above-described nitrogen-containing compound, oxidizing agent, slag forming agent and binder is first mixed by a V-type mixer, a ball mill or the like. Furthermore, it mixes, adding water or a solvent (for example, ethanol), and can obtain the wet mass. Here, the wet state is a state having a certain degree of plasticity, and means a state in which water or a solvent is preferably contained in an amount of 10 to 25% by weight, more preferably 13 to 18% by weight. Thereafter, the wet mass is directly extruded by an extruder (for example, a die and an inner hole pin provided at the outlet), and the diameter is preferably 1.4 mm to 4 mm, more preferably 1. It is 5 mm to 3.5 mm, and the inner diameter is preferably 0.3 mm to 1.2 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 closed at both ends. Usually, after pressing the hollow cylindrical molded body at regular intervals, each is cut so as to be folded at each closed depression, and then usually dried in the range of 50 to 60 ° C. for 4 to 10 hours, Usually, a cylindrical gas generating agent having a space inside can be obtained in a state where the end is closed by performing drying in two stages of drying for 10 to 10 hours in a range of 105 to 120 ° C. . The length of the gas generant thus obtained is usually in the range of 1.5 to 8 mm, preferably in the range of 1.5 to 7 mm, more preferably in the range of 2 to 6.5 mm. .

Moreover, when the gas generating agent molded object 5 is a column shape (a thing with a comparatively short length with respect to a diameter), a cylinder shape, or a disk shape, a press molding method is mentioned as an example of the manufacturing method. This press molding method will be described. The non-azide composition composed of the above-described nitrogen-containing compound, oxidizing agent, slag forming agent and binder is first mixed by a V-type mixer, a ball mill or the like. Further, water or a solvent (for example, ethanol) is added and mixed to obtain a wet mass, granulated, and dried (at a temperature of about 100 ° C.) to obtain strong granules. This can be put into a press molding machine to obtain a press-formed gas generant molded body . The diameter of the obtained gas generant molded body 5 is preferably 2 to 8 mm, more preferably 3 to 6 mm. The length of the gas generant molded body 5 is preferably 0.5 to 4 mm, and more preferably 1 to 3 mm. When the gas generating agent molded body 5 is cylindrical or disk-shaped, the inner diameter is preferably 0.5 to 2 mm, more preferably 0.5 to 1.5 mm.

The material of the gas generant molded body 5 used in the present invention is a non-azide composition, and is composed of, for example, a fuel, an oxidant, and an additive (binder, slag forming agent, combustion modifier). Things can be used.

  Examples of the fuel include nitrogen-containing compounds. Examples of the nitrogen-containing compound include one or a mixture of two or more selected from triazole derivatives, tetrazole derivatives, guanidine derivatives, azodicarbonamide derivatives, hydrazine derivatives, urea derivatives, and ammine complexes.

  Examples of the triazole derivative include 5-oxo-1,2,4-triazole, aminotriazole and the like. Specific examples of the tetrazole derivatives include tetrazole, 5-aminotetrazole, aminotetrazole nitrate, nitroaminotetrazole, 5,5′-bi-1H-tetrazole, 5,5′-bi-1H-tetrazole diammonium salt, 5 , 5'-azotetrazole diguanidinium salt and the like. Specific examples of the guanidine derivative include guanidine, nitroguanidine, cyanoguanidine, triaminoguanidine nitrate, guanidine nitrate, aminoguanidine nitrate, and guanidine carbonate. Specific examples of the azodicarbonamide derivative include azodicarbonamide and the like. Specific examples of the hydrazine derivative include carbohydrazide, carbohydrazide nitrate complex, oxalic acid dihydrazide, hydrazine nitrate complex, and the like. Examples of the urea derivative include biuret. Examples of the ammine complex include a hexaammine copper complex, a hexaammine cobalt complex, a tetraammine copper complex, and a tetraammine zinc complex.

Among these nitrogen-containing compounds, one or more selected from tetrazole derivatives and guanidine derivatives are preferable, and nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole, aminoguanidine nitrate, and guanidine carbonate are particularly preferable.
The compounding ratio of these nitrogen-containing compounds in the gas generant molded product 5 varies depending on the number of carbon atoms, hydrogen atoms and other atoms to be oxidized in the molecular formula, but is usually preferably in the range of 20 to 70% by weight, 30 A range of ˜60% by weight is particularly preferred. Moreover, the absolute value of the compounding ratio of the nitrogen-containing compound varies depending on the kind of the oxidant added to the gas generant molded body . However, if the absolute value of the compounding ratio of the nitrogen-containing compound is larger than the theoretical amount of complete oxidation, the trace CO concentration in the generated gas increases. small amount concentration of NO _X generated gas to become less increases. Therefore, the range in which the optimum balance between the two is maintained is most preferable.

  As the oxidizing agent, an oxidizing agent selected from at least one of nitrates, nitrites, and perchlorates containing a cation selected from alkali metals, alkaline earth metals, transition metals, and ammonium is preferable. Oxidizing agents other than nitrates, that is, oxidizing agents that are frequently used in the field of airbag inflators such as nitrite and perchlorate can also be used, but the number of oxygen in the nitrite molecule is reduced compared to nitrate, or Nitrate is preferred from the standpoint of reducing the production of fine powder mist that is easily released out of the bag. Examples of the nitrate include sodium nitrate, potassium nitrate, magnesium nitrate, strontium nitrate, phase-stabilized ammonium nitrate, basic copper nitrate, and the like, and strontium nitrate, phase-stabilized ammonium nitrate, and basic copper nitrate are more preferable.

The mixing ratio of the gas generating agent molded body 5 of the oxidizing agent, although the absolute numerical depending on the type and amount of the nitrogen-containing compound used different, preferably in the range of 30 to 80% by weight, in particular reduction of the CO and NO _X concentration From the viewpoint, the range of 40 to 75% by weight is preferable.

Any binder can be used as long as it does not have a significant adverse effect on the combustion behavior of the gas generant molded article . Examples of the binder include metal salts of carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, cellulose acetate, cellulose propionate, cellulose acetate butyrate, nitrocellulose, microcrystalline cellulose, guar gum, polyvinyl alcohol, polyacrylamide, starch and other polysaccharides. Examples thereof include organic binders such as derivatives and stearates, inorganic binders such as molybdenum disulfide, synthetic hydroxytalcite, acid clay, talc, bentonite, diatomaceous earth, kaolin, silica, and alumina.

The blending 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 the extrusion molding. As the amount of addition increases, the fracture strength of the molded body increases. However, the number of carbon atoms and hydrogen atoms in the composition increases, the concentration of a trace amount of CO gas that is an incomplete combustion product of carbon atoms increases, and the quality of the generated gas decreases. Moreover, since the combustion of a gas generating agent molded object is inhibited, use by the minimum amount is preferable. In particular, if the amount exceeds 15% by weight, the relative proportion of the oxidant needs to be increased, the relative proportion of the gas generating compound decreases, and it becomes difficult to establish a practical gas generator system.

Moreover, a slag formation agent can be mix | blended as components other than a binder as an additive. The slag forming agent is added in order to facilitate the filtration with the filter material 7 in the gas generator 1 due to the interaction with the metal oxide generated from the oxidant component in the gas generant molded body . Examples of the slag forming agent include naturally occurring clay, synthetic mica, synthetic kaolinite, synthetic smectite and the like mainly composed of aluminosilicates such as silicon nitride, silicon carbide, acid clay, silica, bentonite and kaolin. Among these, artificial clay, talc which is a kind of hydrous magnesium silicate mineral, and the like can be mentioned. Among these, acidic clay or silica is preferable, and acidic clay is particularly preferable. The blending ratio of the slag forming agent is preferably in the range of 0 to 20% by weight, particularly preferably in the range of 2 to 10% by weight. If the amount is too large, the linear combustion rate is lowered and the gas generation efficiency is lowered. If the amount is too small, the slag forming ability cannot be sufficiently exhibited.

Preferred combinations of materials for the gas generating agent molded bodies 5, 5-aminotetrazole, strontium nitrate, synthetic hydrotalcite, and the gas generating agent molded article containing silicon nitride, or guanidine nitrate, strontium nitrate, basic copper nitrate And a gas generant shaped product containing acid clay.

  Moreover, you may add a combustion regulator as needed. As the combustion modifier, metal oxides such as metal oxides, ferrosilicon, activated carbon, graphite, or hexogen, octogen, 5-oxo-3-nitro-1,2,4-triazole can be used. The blending ratio of the combustion modifier is preferably in the range of 0 to 20% by weight, particularly preferably in the range of 2 to 10% by weight. If the amount is too large, the gas generation efficiency is lowered. If the amount is too small, a sufficient combustion rate cannot be obtained.

Gas generating agent molded body 5 used in the present invention, since it is formed of a non-azide gas generating agent, the raw materials used are as small as human hazards. Further, by selecting the fuel component and the oxidant component, the calorific value per mol of generated gas can be suppressed, and the gas generator can be reduced in size and weight.

The range of the preferable linear burning rate of the gas generant molded product used in the present invention is 3 to 60 mm / second, more preferably 5 to 35 mm / ^second under 70 kgf / cm ² , and a preferable pressure index. The range is n = 0.90 or less, more preferably n = 0.75 or less, and particularly preferably n = 0.60 or less. The linear burning rate of the gas generant molded product 5 is measured under a constant pressure condition, and empirically follows the following Villele equation.
r = aP ⁿ

  Here, r is a linear burning rate, a is a constant, P is pressure, and n is a pressure index. The pressure index n indicates a slope of a logarithmic plot of the pressure on the X axis with respect to the logarithm of the combustion speed on the Y axis.

  Moreover, as a method for measuring the linear burning rate, a strand burner method, a small motor method, and a sealed pressure vessel method are generally cited. 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 on the surface. At this time, the linear combustion rate is measured using the pressure in the high-pressure vessel as a variable, and the pressure index can be obtained from the above-mentioned Villele equation.

The enhancer agent molded body 14 is manufactured by press molding or extrusion molding, more preferably extrusion molding. Examples of the shape include a pellet shape, a columnar shape, a cylinder shape, a disk shape, and a hollow body shape in which both ends are closed. Examples of the cylindrical shape include a cylindrical shape, and examples of the cylindrical shape include a single-hole cylindrical shape and a porous cylindrical shape. The hollow body shape with both ends closed includes a cylindrical shape with both ends closed. 1-10 mm is preferable and, as for the diameter of the enhancer agent molded object 14 , 1-8 mm is more preferable. The length is preferably 1 to 10 mm, more preferably 1 to 8 mm, and particularly preferably 1 mm to 5 mm.

As the material of the enhancer agent molded body 14, a material containing the following commonly used composition is used. Examples thereof include a metal powder represented by B / KNO ₃ , a composition containing an oxidizing agent, a composition containing a nitrogen-containing compound / oxidizing agent / metal powder, and the like. Examples of the nitrogen-containing compound include those that can be used as fuel components (aminotetrazole, guanidine nitrate, etc.) of the gas generant molded article . Examples of the oxidizing agent include nitrates such as potassium nitrate, sodium nitrate, and strontium nitrate. Examples of the metal powder include boron, magnesium, aluminum, magnalium (magnesium-aluminum alloy), titanium, zirconium, tungsten, and the like. Preferable combinations include those containing 5-aminotetrazole, potassium nitrate and boron, guanidine nitrate, potassium nitrate and boron. And it may contain 0-10% of the binder for shaping | molding as needed.

In the gas generator 1 of the present invention, and the separation sheet 35 as a boundary, et Nhansa agent shaped body 14 of cylindrical shape or the like is filled in the first partition member 15 side of the combustion chamber 6. Furthermore, since the separation sheet 35 is disposed between the plurality of gas generant molded bodies 5 and the plurality of enhancer agent molded bodies 14, the enhancer agent molded body 14 enters the gap between the gas generant molded bodies 5. There is nothing. Further, even during transportation or after attachment to an automobile or the like, mixing of the plurality of gas generant molded bodies 5 and the plurality of enhancer molded bodies 14 can be suppressed in the combustion chamber 6. For this reason, the performance of the gas generator can be made more reliable and stable.

In the present invention, the separation sheet 35 that separates the plurality of gas generant molded bodies 5 and the plurality of enhancer agent molded bodies 14 is preferably disc-shaped. The diameter depends on the inner diameter of the housing 4. The separation sheet 35, and shall have a hole. If the hole is provided , the gas generating agent molded body 5 is more reliably ignited by the flame generated from the enhancer agent molded body 14. As those having pores, gold network, expanding Metall and the like. The thickness is preferably in the range of 0.1 to 1.0 mm, and more preferably in the range of 0.4 to 1.0 mm. The size of the hole is appropriately determined according to the sizes of the gas generant molded body 5 and the enhancer molded body 14 .

Since the separation sheet 35 is simply placed after the gas generating agent molded body 5 is filled when the gas generator 5 is manufactured, compared to the case of using an enhancer agent cup that is caulked and fixed to the squib holder. , Can reduce man-hours during manufacturing and contribute to cost reduction.

In the gas generator 1 of the present invention, the separation because the sheet 35 is used, even if the enhancer agent molded article 14 is small Ri good gas generating agent molded body 5, the enhancer agent molded article 14 is a gas generating agent molded body 5 with each other Can be prevented from entering the gap. Therefore, the present invention is particularly useful when the enhancer agent molded body 14 is smaller than the gas generant molded body 5 .

In the gas generator of the present invention, the filter 4, the second partition member 9, the gas generating agent molded body 5, the separation sheet 35, the enhancer agent molded body 14, and the first partition member 15 are arranged in the housing 4 from the bottom 2. The igniter 10 that is filled in this order and is caulked and fixed to the holder 12 is fitted into the open end 3 of the housing 4.

  The housing 4 has a bottomed cylindrical shape, preferably a bottomed cylindrical shape in which one end portion thereof is closed to constitute the bottom portion 2 and the other end portion is opened to constitute the open end portion 3. Examples of the material include stainless steel, iron, and aluminum. The outer diameter B of the housing 4 is preferably 30 mm or less, and more preferably in the range of 20 mm to 30 mm.

  In the gas generator in which the gas discharge hole 11 is provided on the outer periphery of the housing 4 forming the filter chamber 8, the shape of the bottom 2 of the housing 4 is not limited, and is, for example, rounded or angular. It may be a shape or the like. However, a bowl shape (FIGS. 1 and 2) or a flat bottom shape (FIG. 3) as shown in the drawings described later is preferable. In particular, in the case of a bowl shape, even if the pressure in the housing rises, it does not deform. Further, since the bottom 2 is closed, only the opening end 3 needs to be sealed, the number of parts can be reduced, and the sealing portion can be only one place at the opening end 3. Therefore, the safety of the gas generator 1 can be improved and the size can be reduced.

The gas discharge holes 11 are preferably provided on the outer periphery of the housing 4 around the filter chamber 8 at a position where no propulsive force is generated in the inflator during gas discharge, and a plurality of gas discharge holes 11 may be provided. It is more preferable that four are provided, and four are provided every 90 degrees on the same outer periphery. The gas discharge holes 11 may be provided not only in one row in the axial direction but also in two or more rows. In this case, the gas discharge holes 11 may be provided in a zigzag shape. The high-temperature and high-pressure gas generated by the combustion of the gas generant molded body 5 in the combustion chamber 6 passes through the filter material 7 mounted in the filter chamber 8, is cooled and filtered, and these gas discharge holes 11. Released from. A seal member may be attached to the gas discharge hole 11 from the inside to block between the inside of the gas generator and the outside air. In addition, you may provide the gas discharge | release hole 11 in the bottom part of the bottomed cylindrical housing 4 if desired.

  A filter chamber 8 is provided in the housing 4. A filter material 7 is provided in the filter chamber 8. The filter material 7 may be, for example, a columnar or cylindrical shape, preferably a cylindrical shape, depending on, for example, an aggregate of knitted wire mesh, plain weave wire mesh, or crimp woven metal wire. The shape of the end portion of the filter material 7 is appropriately determined according to the shape of the abutting portion.

  The filter material 7 is mounted in contact with the tip portion of the bottom 2 of the housing 4. And it is pressed and fixed to the bottom part 2 of the housing 4 by the 2nd partition member 9 formed with the metal etc. which partition the inside of the housing 4. FIG.

The second partition member 9 divides the filter chamber 8 and the combustion chamber 6 into a two-chamber structure to reduce damage (melting) of the filter material 7 due to the combustion heat of the gas generant molded body 5. The material is, for example, stainless steel, iron, aluminum or the like. The shape is preferably a flat donut shape or a disk shape and has holes 18. For example, a seal member 16 such as an aluminum tape is attached to the second partition member 9. This prevents moisture from entering the combustion chamber 6 of the housing 4. The seal member 16 is preferably affixed to the combustion chamber 6 side of the second partition member 9 and is not affixed to the gas discharge hole 11 side. The diameter of the seal member 16 may be 4 mm or more larger than the diameter of the hole 18. The sticking to the second partition member 9 is simple, and this sticking can reduce the manufacturing cost of the gas generator.

  The second partition member 9 is fixed in the housing 4 by being caulked from the outer peripheral portions of the housing 4 on both sides of the bottom portion 2 and the opening end 3 of the second partition member 9 (two locations). 4 is partitioned into a filter chamber 8 and a combustion chamber 6.

Specifically, the housing 4 and the second partition member 9 are placed on the outer peripheral surface of the housing 4 so that the second partition member 9 is inserted into the wall of the housing 4 by 0.1 mm or more from the outer peripheral end surface. Adhering is performed by caulking (for example, with caulking force of 80 kN or more) at two locations straddling the partition member 9. The biting length can be measured with a magnifying microscope manufactured by Keyence Corporation after the relevant part is cut and exposed. The thickness of the outer peripheral end face of the second partition member 9 is preferably about 0.5 to 2.5 mm. The caulking interval is preferably in the range of 5 to 10 mm. The wall thickness of the housing 4 is preferably 1.5 to 2.3 mm. The housing 4 is preferably a cold-finished seamless steel pipe having a tensile strength of 585 to 715 N / mm ² , a yield point of 540 to 670 N / mm ² , and an elongation of 18 to 26%, and the second partition member 9 is preferably SUS304. Is used.

  Since it is caulked as described above, it does not require a process of notching the outer peripheral end face of the conventional partition member and mounting a seal material such as an O-ring, so the cost is low and the second partition member Since the housing 9 and the housing 4 are securely fixed, it is possible to obtain a gas generator with high airtightness.

In the gas generator of the present invention suitably used for inflating the side airbag or the like, a relatively large amount of the chemical such as the gas generant molded body 5 is used. Therefore, by using the second partition member 9, It is possible to partition the filter chamber 8 and the combustion chamber 6 and prevent the filter from being damaged by the combustion heat of the gas generant molded body 5.

The first partition member 15 divides the combustion chamber 6 and the igniter 10, but also functions as a protective material, that is, a cushion material, that prevents the enhancer agent molded body 14 from being powdered by vibration. The first partition member 15 is formed with a cross-shaped notch for reliably transmitting the flame power from the igniter 10 to the enhancer agent molded body 14 without delay. The first partition member 15 is preferably formed using an elastic material such as silicon rubber or silicon foam formed of ceramic fiber, foamed silicon, or the like.

The first partition member 15 is pressed against the enhancer agent molded body 14 by the support member 20. The support member 20 has a function of fastening the first partition member 15 and is manufactured by molding a metal plate such as iron.

  An igniter 10 held by a holder 12 is attached to the open end 3 of the housing 4. As the igniter 10, one in which the embolus is formed of glass, plastic, or resin can be preferably used.

The igniter 10 contains an ignition powder. As the igniting agent, it is preferable to use a material having zirconium (Zr), tungsten (W), potassium perchlorate (KClO4) as a component, and using fluorine rubber or nitrocellulose as a binder. The composition ratio (weight ratio) of zirconium, tungsten, and potassium perchlorate is preferably Zr: W: KClO ₄ = 3: 3.0 to 4.0: 3.0 to 4.0, and Zr: W: KClO ₄ = 3: 3.5: 3.5 is more preferable. As the ignition agent, a combination of basic copper nitrate, zirconium, a binder and the like is also used.

  Further, the holder 12 is fitted into the open end 3 of the housing 4 and fixed by being caulked by the open end 3 of the housing 4, and closes the open end 3.

  The holder 12 is provided with a recess 13 for fixing to the housing 4 by caulking. Moreover, in order to press the support member 20 provided in order to fix the 1st partition member 15, the support member press part 21 is provided. Further, in order to improve moisture resistance by the O-ring 22, a groove for arranging it is provided.

Next, the operation of the gas generator 1 will be described. When the collision sensor detects an automobile collision, a signal is sent to the igniter 10 of the gas generator 1 to ignite. The flame of the igniter 10 ruptures and opens the first partition member 15, and then jets into the combustion chamber 6 to ignite the enhancer agent molded body 14. Next, the flame generated from the enhancer agent molded body 14 destroys or passes through the separation sheet 35 to ignite and burn the gas generating agent molded body 5 to generate high-temperature gas. When combustion in the combustion chamber 6 proceeds and the combustion chamber 6 rises to a predetermined internal pressure, the high-temperature gas generated in the combustion chamber 6 breaks the seal member 16 provided in the hole 18 and enters the filter chamber 8. Enters and flows into the filter material 7, where it becomes a clean gas through slag collection and cooling. This clean gas is discharged from the gas discharge hole 11.

  As a result, the sufficiently cooled clean gas discharged from the gas discharge holes 11 is directly introduced into the interior of the air belt, the side air bag, and the like, and the belt and the air bag are instantly inflated.

  Next, the gas generator 40 which is 2nd Embodiment based on this invention is demonstrated using FIG. The gas generator 40 according to the present invention is different from the gas generator 1 according to the first embodiment shown in FIG. 1 in that the filter material 47 is cylindrical. In the gas generator 40 of the present invention, the high-temperature gas generated in the combustion chamber 6 passes through the hole 18 and enters the space 19 of the filter material 47, passes through the filter material 47, undergoes slag collection and cooling, It becomes clean gas and is discharged from the gas discharge hole 11. In the gas generator 40, since the filter material 47 is cylindrical, the cooling efficiency of the filter material 47 is increased by increasing the gas passage surface area. As a result, the weight of the filter material 47 can be reduced, and the effect that the gas generator can be further reduced in weight can be expected. In addition, in this embodiment example, about the site | part which is common in the gas generator 1 in the above-mentioned 1st Embodiment example, the detailed description is abbreviate | omitted using the same code | symbol.

  Next, a gas generator 50 according to a third embodiment of the present invention will be described with reference to FIG. The gas generator 50 according to the present invention is different from the gas generator 1 according to the first embodiment shown in FIG. 1 in that the bottom 52 of the housing 54 has a flat bottom shape, and the filter material 47 is cylindrical. And the gas discharge holes 51 are arranged in two rows in the axial direction.

  2 differs from the gas generator 40 according to the second embodiment shown in FIG. 2 in that the bottom portion 52 of the housing 54 has a flat bottom shape and the gas discharge holes 51 are installed in two rows in the axial direction. It is a point.

  Even if it does in this way, since the bottom part 52 is obstruct | occluded similarly to the gas generators 1 and 40 of this invention, it is only necessary to seal only the opening edge part 53, and it can reduce a number of parts. Since the sealing portion can be provided only at one portion of the opening end portion 53, the safety of the gas generator can be improved and the size can be reduced.

  Further, in the gas generator 50 of the present invention, since the gas discharge holes 51 are arranged in two rows in the axial direction, the gas generated in the housing 54 is discharged without being concentrated. To prevent damage. Moreover, the filter material 47 can be used in a wide range, and the filter material 47 can be used efficiently.

Moreover, also in the gas generator 40 which is 2nd Embodiment which concerns on this invention, and the gas generator 50 which is 3rd Embodiment, several gas generating agent molded object 5 and several enhancer agent molded object 14 are included. Since it has the separation sheet 35 that can be separated, the enhancer agent molded body 14 does not enter the gap between the gas generating agent molded bodies 5, and it is in the combustion chamber 6 even during transportation or after being attached to an automobile or the like. Therefore, mixing of these is suppressed. For this reason, the performance of the gas generator can be made more reliable and stable.

  Further, in the gas generator 50 of the present invention, the high temperature gas generated in the combustion chamber 6 passes through the hole 18 and enters the space 19 of the filter material 47 and passes through the filter material 47 to collect and cool the slag. Then, it becomes a clean gas and is discharged from the gas discharge hole 51. In the gas generator 50, since the filter material 47 is cylindrical, the cooling efficiency of the filter material 47 is increased by increasing the gas passage surface area. As a result, the weight of the filter material 47 can be reduced, and the gas generator can be further reduced in weight. In addition, in this embodiment example, about the site | part which is common in the gas generator 1 in the above-mentioned 1st Embodiment example and 2nd Embodiment example, the same code | symbol is used and detailed description is abbreviate | omitted.

  The gas generators 1, 40 and 50 of the present invention are suitably used as a side (side collision) gas generator.

  In the following, a production example of a hollow body-shaped gas generating agent having both ends closed and a manufacturing example of an extruded enhancer agent used in the gas generator of the present invention are shown as reference examples. However, the production example of the gas generating agent and the production example of the extruded enhancer agent are not limited to these reference examples.

(Reference Example 1) Production Example of Hollow Body Shaped Gas Generator Molded Body Closed at Both Ends Used for Gas Generator Guanidine nitrate 43.5% by weight, strontium nitrate 25% by weight, basic copper nitrate 25% by weight, 3% by weight of ethanol and 13% by weight of water were added to a composition mixed with 2.5% by weight of acid clay and 4% by weight of polyacrylamide, mixed and kneaded to form a kneaded mass, and the outlet had an inner diameter of 2 mm. Extrusion is performed at an extrusion pressure of 8 MPa using an extruder equipped with a die and an inner hole pin having a diameter of 0.5 mm, and the extruded rod-shaped molded product is fed between the molding gears while being taken up by the take-up belt. Indented parts are formed at intervals of 4.4 mm by the convex teeth of the teeth, cut in a folded part at the recessed parts, then dried at 55 ° C. for 8 hours, then dried at 110 ° C. for 8 hours, and a gas generating agent A molded body was obtained.

Reference Example 2 Production Example of Extruded Enhancer Agent Molded Body Used for Gas Generator of the Present Invention Boron fine powder: 12.0 parts by weight was weighed into a spiral mixer, ethanol: 3.0 parts by weight / ion Exchanged water: 15.0 parts by weight of ethanol water was added and mixed to form a slurry. Separately, 5-aminotetrazole (50% particle size, 15 μm): 11.0 parts by weight, potassium nitrate (50% particle size, 60 μm): 70.5 parts by weight, acid clay (50% particle size, 17 μm): 1. 5 parts by weight, hydroxypropyl cellulose {trade name; Metroz 90SH-100000 (manufactured by Shin-Etsu Chemical Co., Ltd.)}: 3.0 parts by weight, polyvinylpyrrolidone {trade name; rubiscol K90 (manufactured by BASF)}: 2 0.0 part by weight was dry mixed with a V-type mixer. Next, this mixture was kneaded with a spiral mixer to obtain a wet kneading agent. This kneading agent was put into a vacuum kneading extruder, extruded through a die having a diameter of 1.8 mm, and cut at a length of 2.5 mm (molded body surface area: 19.2 mm ² / piece). This was dried at 55 ° C. for 8 hours, then at 110 ° C. for 8 hours, classified using a 1 mm sieve and a 2.8 mm sieve to remove powder and irregular shapes, and on a 1 mm sieve. In addition, an enhancer agent molded body was obtained.

Reference Example 3 Production Example of Extruded Enhancer Agent Molded Body Used for Gas Generator of the Present Invention 5-Aminotetrazole (50% particle size, 15 μm): 11.7 parts by weight, boron fine powder (50% Particle size, 9 μm): 16.7 parts by weight, molybdenum trioxide (50% particle size, 17 μm): 1.5 parts by weight were dry-mixed with a V-type mixer. Subsequently, 50 parts by weight (concentration: 2% by weight) of an isoamyl acetate solution of nitrocellulose (1 part by weight in terms of nitrocellulose) was added, and the mixture was further mixed into a slurry in a mortar. To this, potassium nitrate (50% particle size, 60 μm): 70.1 parts by weight was added and further mixed until uniform. Thereafter, isoamyl acetate was evaporated, passed through a mesh of 1 mm, and dried at 110 ° C. for 5 hours to obtain a granular explosive. This granular explosive was molded into a diameter of 6.0 mm and a length of 2.0 mm using a tableting machine (molded body surface area: 94.2 mm ² / piece), and further dried at 110 ° C. for 3 hours. Then, classification was performed using a sieve having an opening of 1 mm and a sieve having a diameter of 6.5 mm, and powders and irregularly shaped products were removed, and an enhancer agent molded body was obtained on the sieve having an opening of 1 mm.

  The present invention is not limited to the gas generators 1, 40, 50 described with reference to FIGS. 1 to 3, but the gas generators 101, 201 of the fourth to seventh embodiments illustrated in FIGS. 4 to 7. , 301, 401. Here, the gas generators 101, 201, 301, 401 illustrated in FIGS. 4 to 7 all have gas discharge chambers 130, 230, 330, 430. Below, each gas generator 101,201,301,401 is demonstrated. In addition, about the site | part which is common in the site | part which comprises gas generator 1,40,50 illustrated by FIGS. 1-3, the detailed description is abbreviate | omitted using the same code | symbol.

  A gas generator 101 according to the fourth embodiment illustrated in FIG. 4 has a housing 104 opened in a bottomed cylindrical housing 104 with one end (hereinafter referred to as “open end”) 103 opened. A gas discharge chamber 130, a filter chamber 108, a combustion chamber 106, and an igniter 10 are arranged in a direction from an end portion (hereinafter referred to as “bottom portion”) 102 different from the end portion 103 toward the open end portion 103. Arranged in order. The filter chamber 108 and the combustion chamber 106 are partitioned by a second partition member 109, the combustion chamber 106 and the igniter 10 are partitioned by a first partition member 15, and the gas discharge chamber 130 and the filter chamber 108 are separated by a third partition. Comparted by member 120. The bottom portion 102 has a flat bottom shape and is a small diameter portion with a reduced diameter.

  The gas discharge chamber 130 is formed by a small diameter portion of the housing 104. That is, the diameter is smaller than the portion of the housing 104 that forms the filter chamber 108, the combustion chamber 106, and the igniter 10. A plurality of gas discharge holes 111 penetrating the gas discharge chamber 130 are provided along the circumferential direction on the outer periphery of the housing 104 forming the gas discharge chamber 130.

  In the filter chamber 108, a columnar filter material 107 is disposed without a gap from the inner wall of the housing 104 forming the filter chamber 108. The filter material 107 is preferably made of, for example, a cylindrical member made of an aggregate of knitted wire mesh, plain woven wire mesh, or crimp woven metal wire.

Like the gas generator 1 shown in FIG. 1, the combustion chamber 106 is filled with a plurality of gas generant molded bodies 105 and a plurality of enhancer agent molded bodies 14. The gas generant molded body 105 is preferably in a columnar shape or a pellet shape. The gas generating agent molded body 105 and the enhancer agent molded body 14 are filled in this order in the direction from the second partition member 109 toward the first partition member 15. Further, the plurality of gas generating agent molded bodies 105 and the plurality of enhancer agent molded bodies 14 are separated into two layers of a gas generating agent layer and an enhancer agent layer by a separation sheet 35. Thus, since the gas generating agent molded body 105 and the enhancer agent molded body 14 are separated by the separation sheet 35, the both 105 and 14 do not mix in the combustion chamber 106. Moreover, since both 105 and 14 are closely_contact | adhered via the separation sheet 35, the combustion performance of the gas generator 101 can be stabilized.

  The second partition member 109 is a narrow cylindrical member, and four claw portions 109b protruding in the radially inward direction are formed at equal intervals in the circumferential direction at one end portion. Accordingly, the central portion 109a of the second partition member 109 is opened, and the gas easily flows from the combustion chamber 106 toward the filter chamber 108. The second partition member 109 not only partitions the filter chamber 107 and the combustion chamber 106 but also supports the filter 107 and is fixed to the inner wall of the housing 104. Moreover, the 3rd partition member 120 is the structure similar to the 2nd partition member 9 of the gas generator 1 illustrated by FIG. That is, the third partition member 120 has a disk shape having a hole 18 at the center, and the hole 18 is sealed with the seal member 16. As a result, it is not necessary to seal the gas discharge hole 111, so that the cost can be reduced. A support member 121 for supporting the filter material 107 is also provided between the third partition member 120 and the filter material 107. The support member 121 has a plurality of holes 121 a so that gas flows from the filter chamber 108 toward the gas discharge chamber 130.

  With the configuration illustrated in FIG. 4, the gas generated in the combustion chamber 106 flows from the combustion chamber 106 toward the gas discharge chamber 130 via the columnar filter material 107. Therefore, the filter material 107 is used efficiently and there is little loss. Further, since the gas is discharged from the gas discharge holes 111 formed on the outer periphery of the housing 104 that forms the gas discharge chamber 130, no propulsive force in the axial direction is generated.

  The gas generator 201 of the fifth embodiment shown in FIG. 5 is different from the gas generator 101 shown in FIG. 4 in that it does not have the second partition member 109, but is otherwise configured. There is no significant difference. In addition, about the site | part which is common in the site | part which comprises the gas generator 1,40,50 shown in FIGS. 1-3 and the gas generator 101 shown in FIG. 4, detailed description is used using the same code | symbol. Is omitted.

  A gas generator 201 shown in FIG. 5 has a bottomed cylindrical housing in which one end portion (hereinafter referred to as “open end portion”) 203 is opened, similarly to the gas generator 101 shown in FIG. 204, a gas discharge chamber 230, a filter chamber 208, and a combustion chamber 206 in a direction from an end (hereinafter referred to as “bottom”) 202 different from the open end 203 of the housing 204 toward the open end 203. The igniter 10 is arranged in this order. The filter material 107 disposed in the filter chamber 208 is supported by the support member 121 on the gas discharge chamber 230 side and is caulked and fixed on the combustion chamber 206 side by the housing 204. Therefore, the second partition member 109 does not exist, and the filter chamber 208 and the combustion chamber 206 are not partitioned. The combustion chamber 206 and the igniter 10 are partitioned by the first partition member 15, and the gas discharge chamber 230 and the filter chamber 208 are partitioned by the third partition member 120. The bottom portion 202 has a flat bottom shape and is a small diameter portion with a reduced diameter.

  With the configuration shown in FIG. 5, the number of parts can be reduced in that the second partition member 109 is not required. In addition, since there is no second partition member 109 that partitions the filter chamber 207 and the combustion chamber 206, the gas flows from the combustion chamber 206 toward the filter chamber 208 without receiving any resistance. Further, similarly to the gas generator 101 shown in FIG. 4, the columnar filter material 107 is used efficiently, there is little loss, and no thrust is generated in the axial direction.

  The gas generator 301 of the sixth embodiment shown in FIG. 6 has a second partition member 109, a third partition member 120, and a support member 121 as compared with the gas generator 101 shown in FIG. Although the configuration of the corresponding members is different, there are no other significant structural differences. In addition, about the site | part which is common in the site | part which comprises the gas generators 1, 40, and 50 shown in FIGS. 1-3 and the gas generator 101 shown in FIG. Is omitted.

  A gas generator 301 illustrated in FIG. 6 has a bottomed cylindrical housing in which one end portion (hereinafter referred to as “open end portion”) 303 is opened, similarly to the gas generator 101 illustrated in FIG. 304, a gas discharge chamber 330, a filter chamber 308, and a combustion chamber 306 in a direction from an end (hereinafter referred to as “bottom”) 302 different from the open end 303 of the housing 304 toward the open end 303. The igniter 10 is arranged in this order.

  The filter chamber 308 and the combustion chamber 306 are partitioned by a second partition member 309. The second partition member 309 has a disk shape, and a plurality of holes 309 a are formed so that gas flows from the combustion chamber 306 toward the filter chamber 308. Further, a seal member 316 such as aluminum is attached so as to block all the plurality of holes 309a. The second partition member 309 is fixed by caulking from the outer peripheral portion of the housing 304. This eliminates the need to seal the gas discharge hole 311, thereby reducing the cost.

  The third partition member 320 partitions the gas release chamber 330 and the filter chamber 308 and supports the filter material 107. The third partition member 320 has a disk shape, and a plurality of holes 320 a are formed so that gas flows from the filter chamber 308 toward the gas discharge chamber 330. Since the combustion chamber 306 is sealed from the outside by the second partition member 309, it is not necessary to seal the gas discharge chamber 330 and the filter chamber 308 unlike the gas generator 101 shown in FIG.

  The second partition member 309 is fixed by caulking from the outer peripheral portion of the housing 304, so that a gap is generated between the filter material 107 and the inner wall of the housing 304 that forms the filter chamber 308. Therefore, the hole 309 formed in the second partition member 309 is formed at a portion where the filter material 107 is disposed so that the gas flowing from the combustion chamber 306 toward the gas discharge chamber 311 passes through the filter material 107. It is preferable.

  With the configuration illustrated in FIG. 6, the number of parts can be reduced as compared with the gas generator 101 illustrated in FIG. 4. Further, similarly to the gas generators 101 and 201 shown in FIGS. 4 and 5, the columnar filter material 107 is used efficiently, there is little loss, and no axial thrust is generated.

  The gas generator 401 of the seventh embodiment shown in FIG. 7 is different in configuration from the gas generator 201 shown in FIG. There is no difference. In addition, about the site | part which is common in the site | part which comprises the gas generator 1,40,50 illustrated in FIGS. 1-3 and the gas generator 201 illustrated in FIG. Is omitted.

  A gas generator 401 shown in FIG. 7 has a bottomed cylindrical housing in which one end portion (hereinafter referred to as “open end portion”) 403 is opened, similarly to the gas generator 201 shown in FIG. 404, a gas discharge chamber 430, a filter chamber 408, and a combustion chamber 406 in a direction from an end portion (hereinafter referred to as “bottom portion”) 402 different from the open end portion 403 of the housing 404 toward the open end portion 403. The igniter 10 is arranged in this order. However, in the gas generator 201 illustrated in FIG. 5, the portion of the housing 204 that forms the gas discharge chamber 230 is smaller in diameter than the other portions. However, in the gas generator 401 illustrated in FIG. The portion of the housing 404 that forms the chamber 430 has substantially the same diameter as the other portions. The plurality of gas discharge holes 411 are provided on the outer periphery of the housing 404 forming the gas discharge chamber 430 so as to penetrate the gas discharge chamber 430.

  By adopting the configuration illustrated in FIG. 7, the cylindrical filter material 107 is used efficiently as in the case of the gas generator 201 illustrated in FIG. 5, and there is little loss and a thrust in the axial direction is generated. The effect that there is nothing is obtained.

In the gas generators 101, 201, 301, and 401 described in the fourth to seventh embodiments, the separation sheet 35 that separates the plurality of gas generant molded bodies 105 and the plurality of enhancer agent molded bodies 14 is also used. Therefore, the enhancer agent molded body 14 does not enter the gap between the gas generant molded bodies 5. Moreover, even during transportation or after being attached to an automobile or the like, mixing of these in the combustion chamber 6 is suppressed. For this reason, the performance of the gas generator can be made more reliable and stable.

  In addition, although this invention is described in said preferable embodiment, this invention is not restrict | limited only to it. It will be understood that various other embodiments may be made without departing from the spirit and scope of the invention.

1 is a diagram showing a first embodiment of a gas generator according to the present invention. It is a figure which shows 2nd Embodiment of the gas generator which concerns on this invention. It is a figure which shows the example of 3rd Embodiment of the gas generator which concerns on this invention. It is a figure which shows the example of 4th Embodiment of the gas generator which concerns on this invention. It is a figure which shows 5th Embodiment of the gas generator which concerns on this invention. It is a figure which shows the 6th Embodiment of the gas generator which concerns on this invention. It is a figure which shows 7th Embodiment of the gas generator which concerns on this invention.

Explanation of symbols

B outer diameter 1,40,50,101,201,301,401 gas generator 2,52,102,202,302,402 bottom 3,53,103,203,303,403 open end 4,54,104 , 204, 304, 404 Housing 5, 105 Gas generant molded body 6, 106, 206, 306 , 406 Combustion chamber 7, 47, 107 Filter material 8, 108, 208, 308, 408 Filter chamber 9, 109, 309, Second partition member 10 Igniter 11, 51, 111, 211, 311, 411 Gas discharge hole 12 Holder 13 Near end of opening 14 Enhancer agent molded body 15 First partition member 16, 316 Seal member 18 Hole 19 Space 20 Support member 21 Support member pressing part 22 O-ring 35 Separation sheet 109a, 309a Hole 121 Support member 21a hole

Claims (10)

In the bottomed cylindrical housing (4, 54, 104, 204, 304, 404) having the open end (3, 53, 103, 203, 303, 403), the open end (3, 53, 103, 203, 303, 403) in a direction from the end (2, 52, 102, 202, 302, 402) toward the open end (3, 53, 103, 203, 303, 403). 7, 47, 107) with a filter chamber (8, 108, 208, 308, 408), a plurality of gas generant molded bodies (5, 105) and a plurality of enhancer agent molded bodies (14) The gas generator (1, 40, 50) in which the chamber (6, 106, 206, 306, 406), the first partition member (15) made of a cushion material , and the igniter (10) are arranged in this order. , 101,2 A 1,301,401),
In the combustion chamber (6, 106, 206, 306, 406), the plurality of enhancer agent molded bodies (14) are disposed on the first partition member (15) side, and the plurality of gas generant molded bodies (5, 5). 105) is adjacent to the filter chamber (8, 108, 208, 308, 408) side , and the plurality of enhancer agent molded bodies (14) and the plurality of gas generant molded bodies (5, 105) are adjacent to each other. Between the plurality of gas generant molded bodies (5, 105) and the plurality of enhancer agent molded bodies (14). A gas generator characterized by loosely inserting a separation sheet (35) made of a wire mesh or an expanded metal to prevent mixing with a plurality of enhancer agent molded bodies (14). The gas generant molded body ( 5, 105 ) is a molded body having a hollow portion with a diameter of 1.4 to 4.0 mm and a length of 1.5 to 8.0 mm closed at both ends. The gas generator according to claim 1. Said gas generating agent molded article (5, 105), diameter 2.0～8.0Mm, length 0.5~4.0mm of pellets, it cylindrical, a cylindrical or disk-shaped body The gas generator according to claim 1 .   4. The enhancer agent shaped body (14) is a pellet-shaped, tubular-shaped, disk-shaped, hollow-shaped or cylindrical shaped body closed at both ends. 5. A gas generator according to 1.   The gas generator according to claim 4, wherein the enhancer agent shaped body (14) is a shaped body having a diameter of 1 to 10 mm and a length of 1 to 10 mm. Along said circumferential direction of the housing (4, 54) to form the filter chamber (8), according to claim 1, wherein a gas discharge hole for discharging the gas (11, 51) is provided gas generator according to any one of 1-5. The filter material disposed in front Symbol filter chamber (108, 208, 308, 408) (107) is a cylindrical,
With respect to the filter chamber (108, 208, 308, 408), on the end (102, 202, 302, 402) side different from the open end (103, 203, 303, 403), the filter material (107 ) Gas release chambers (130, 230, 330, 430) for releasing gas via
Said gas discharge chamber (130,230,330,430) along said circumferential direction of the housing (104,204,304,404) for forming a gas discharge hole for discharging gas (111, 211, 311, 411) is provided, The gas generator as described in any one of Claims 1-5 characterized by the above-mentioned. A second partition member (9, 309a) formed with a hole (18, 309a) sealed with a seal member (16, 316) between the filter chamber (8, 308) and the combustion chamber (6, 306). 309), the gas generator according to any one of claims 1 to 7, characterized in that it further comprises. A third partition member (120) in which a hole (18) sealed with a seal member (16) is formed between the gas discharge chamber (130, 230, 430) and the filter chamber (108, 208, 408). The gas generator according to claim 7 , further comprising: The second partition member (9,309) is a gas generator according to claim 8, characterized in that it is fixed by caulking from the outer peripheral portion of said housing (4,54,304).

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