WO1996010495A1 - Gas generator for air bag - Google Patents

Abstract

A gas generator for an air bag which includes a short cylindrical container (21) for a gas generator having a central chamber (34), a ring-like outside chamber (35) communicating with the central chamber (34) and encompassing it and emission holes (36) for emitting a gas from the outside chamber (35) to inflate an air bag, a gas generating agent (51) accommodated in the ring-like outside chamber (35), ignition means (10, 40) accommodated in the central chamber (34) for burning the gas generating agent (51), and heat-insulating members (22, 23), (37, 38) for thermally insulating the gas generating agent (51) inside the outside chamber (35) from the container (21), disposed at least at the upper portion and/or at the lower portion of the inside of the outside chamber (35). Because the heat-insulating members (22, 23), (37, 38) are disposed at least the upper portion and/or the lower portion of the inside of the outside chamber (35) of the container (21), the influences of the ambient temperature on the gas generating agent accommodation space can be reduced and a combustion speed within a predetermined range can be obtained.

Description

 Specification

Gas generation for airbags s Technical field

 The present invention relates to a gas generator for an airbag used in a vehicle, and more particularly to a gas generator for an airbag provided with a heat insulating member so that the combustion speed of the gas generating agent is not affected by the surrounding temperature. Background art

 Conventionally, there has been known an occupant protection device that inflates an airbag with a gas generated by a gas generator in order to ensure the safety of a mussel upon collision of a vehicle. The gas generating system has a structure in which a gas generating agent and an igniting agent for igniting the gas generating agent and a squib for igniting the igniting agent are housed in a container. There is also an ignition means that combines the explosive and the squib.

As such a gas generator, the one shown in FIG. 9 is known. In the gas generator 1 for an airbag shown in FIG. 9, reference numeral 27 denotes a lower container made of an aluminum alloy, which has an inner AS 27a and an outer shell 27b. Reference numeral 28 denotes an aluminum alloy upper container, which has an inner cylinder 28a and an outer cylinder 28b. Then, the inner cylinders 27a, 28a and the outer f 727b, 28b are joined together and joined by friction welding to form a short cylindrical container (casin 21. In addition, the container 21 is divided into an annular outer chamber 35 and a central chamber 34 by the inner cylinders 27a and 28a of the lower container 27 and the upper container 28. A bag-shaped protrusion 27 c protruding toward the central chamber 34 is integrally formed at the center portion. Eve (ignition means) 10 is stored. The projecting portion 27c is provided with a quick communication hole 27d for communicating the space inside the projecting portion 27c with the central chamber 34 at the center thereof. Further, an orifice 33 for communicating the outer chamber 35 and the central chamber 34 is opened in the inner cylinder 28 a of the upper container 28, and a gas discharge hole is formed in the outer cylinder 28 b of the upper container 28. 3 6 are open. Above the projecting portion 27 c of the central chamber 34, an ignition agent tube 40 is housed.

 The outer chamber 35 is defined by an inner wall 31 having an orifice 32. And, inside the inner wall 31, a gas generating agent power tap 50 is housed. Outside the inner wall 31, a first coolant 25, a second coolant 26, and a filter 30 in front of a gas discharge hole 36, which are located at the outlet of the orifice 32, are housed. . The filter 30 is sealed with a filter push bar 29.

 Next, the operation of the gas generator 1 will be described. First, when a predetermined flow through the lead wire 7 flows to the S bridge (not shown) of the squib 10, the explosive in the squib is ignited, the tip of the squib is broken, and high-temperature, high-pressure gas is released. Is done. This high-temperature gas breaks the igniting agent cap 40 and ignites the stored igniting agent (ignition hand S) 41.

 The high-temperature gas generated by the burning of the igniting agent 41 passes through the orifice 33, breaks the gas generating agent power 50, and ignites the stored gas generating agent 51. A large amount of gas is generated by the combustion of the gas generating agent 51, and the generated gas passes through the first coolant 25 and the second coolant 26 via the orifice 32, and is cooled and burned. After the residual trapping is performed, the slag is removed through the filter 30 and then from the discharge hole 36 to the inside of the bag (not shown).

This gas generator 1 is built in the airbag module. Furthermore, the air bag module incorporating the gas generator 1 is a steering wheel. Attached to the device.

 Such an airbag module considers the case where the vehicle starts immediately after being hidden in the scorching sun and the case where the vehicle starts immediately after the vehicle is left under severe cold. It must be specified that it can be used even if it is exposed to an ambient temperature of at least 40 ° C to ft 髙 temperature + 85 ° C.

 Meanwhile, the container 21 of the gas generator 1 is formed of a gold (S) material such as aluminum so as to have sufficient strength to withstand the internal pressure due to the generated gas. This metal material such as aluminum generally has good heat conduction, and is easily heated or cooled under the influence of the ambient temperature. Therefore, there is a good possibility that the temperature of the container 21 has a wide temperature distribution from 140 to + 85'C. Also, the weight of the container 21 accounts for a large part of the weight of the gas generator 1, and the maturity S of the container 21 is also large.

 If the container 21 is cooled down to −40 ° C., the amount of heat generated by the combustion reaction of the gas generating agent will be absorbed by the heating of the container 21, and the amount of heat generated will decrease. The burning speed of the gas becomes extremely slow. Conversely, when the container 21 is heated to 85'C, the amount of heat generated by the combustion reaction of the gas generating agent is less likely to be absorbed by the container 21, so that the calorific value increases. The burning rate of the gas generating agent is too fast.

In order to reduce the influence W of the temperature of the container 21 on the burning speed of the gas generating agent, the difference between the calorific value between the low temperature and the high temperature was changed by changing the type of the oxidizing agent of the gas generating agent. In some cases, a gas generant that allows the box to be used may be used. Then, regardless of whether the ambient temperature is low or low, there is no large difference in the calorific value due to the combustion of the gas generating agent, and the reaction rate does not largely change. However, the gas generating agent to the oxidizing agent to reduce the difference in Hatsujuku amount at low temperature and high temperature composed mainly of sodium azide, for example F e ₂ 0 ₃ and A l _a ( Although there are SOJ _β , these components are slag components, so their addition will reduce the gasification rate of the gas generating agent to 50% or less. Therefore, in order to obtain the same amount of gas, a larger amount of gas generating agent was required, which hindered downsizing of the gas generator and the shift to S.

 In addition, since a gas generating agent using an oxidizing agent other than sulfuric acid has a small heat generation S during combustion, if a large amount of heat is absorbed by the envelope 21, the combustion reaction is significantly suppressed, and the required gas Pressure may not be obtained. Therefore, it has been conventionally considered that such a gas generating agent cannot be used, and there has been a limitation on the types of gas generating agents that can be used.

 The present invention has been made in view of such a problem g of the conventional technology, and its main purpose is to provide a gas generating agent storage space which is received from the ambient temperature.

An object of the present invention is to provide a gas generator which has a small effect on (emptiness in which a gas generating agent is substantially present). The object of the present invention is to provide a gas generator which makes it possible to use a gas generating agent having a high gasification rate and which can achieve downsizing and lightening of the gas generator. Another object of the present invention is to provide a gas generator which allows the use of a gas generating agent having a small calorific value during combustion. Disclosure of the invention

 The gas generator for a pair of bags according to the present invention that solves the above-mentioned BI principle has a central chamber, an annular outer chamber having a communicating portion with the central chamber and surrounding the tongue central chamber, and a gas bag for inflating the bag. A short cylindrical container having a discharge hole for discharging gas from the outer chamber, a gas generating agent stored in the S-shaped outer chamber, and a gas generating agent stored in the central chamber for burning the gas generating agent. Ignition means

In order to insulate the gas generating agent in the outer chamber and the container from each other, a heat insulating material provided at least above and / or below the outer chamber is provided. I have.

 In order for the gas generating agent to burn at a specified speed, the temperature at the start of combustion must be within the specified range, and after the start of combustion, the heat exchange between the generated high crude gas and its surroundings must be reduced. is important. Thus, self-contained combustion can be achieved by burning with less transfer of heat from the surroundings. Therefore

It is desirable to provide a heat insulating member between the entire space in which the gas generating agent is stored and its surroundings to completely insulate the space in which the gas generating agent is stored and its surroundings.

 However, due to the structure of the gas generator, it is difficult to arrange a heat-insulating member in the space between the space where the gas generating agent is stored and the surrounding area. Accordingly, the present invention has been made in view of the fact that the gas generator container has a large heat capacity as a whole of the gas generator, and furthermore, the burning speed of the gas generating agent is easily affected by the container temperature *.

 In other words, the gas generating agent contained in the outer chamber of the gas generator container is provided with a cutout material at least above the outer chamber, which is the portion closest to the outermost wall of the container, and Z or below. This is the gas generator of the present invention.

 When the heat insulating member is provided in this way, the combustion state of the gas generating agent is less affected by the container temperature than in the conventional gas generator without the heat insulating member. As a result, even when the container temperature is as low as 140 ° C to as high as 85 ° C, there is little change in the combustion rate of the gas generating agent, and safe and reliable airbag operation is possible. become.

Some gas generators include a cup in the outer chamber for storing the gas generating agent. In this case, the upper and / or lower jujube material in the outer chamber is placed inside the cup. In this way, since no other member is interposed in the M between the heat insulating member and the gas generating agent, the gas generating agent storage space and its surroundings are reliably disconnected. heat. However, when at least a part of the cup is formed of a low-grade material such as a wire mesh, an upper and / or lower heat insulating member in the outer chamber may be provided outside the cup. it can.

 When the heat insulating material is put on the outside of the front K cup, it is preferable that the heat insulating material is disposed so as to be in direct contact with the outside of the upper surface and / or the lower surface of the cup. However, the gas generator is provided with an inner wall for partitioning the space inside the container, and depending on the shape of the inner wall, the inner wall is arranged so as to be in direct contact with the upper surface of the cup and the outside of the Z or lower surface. S can be difficult to do. In this case, a heat insulating material is provided at least between the upper surface of the forceps and the inner surface node of the container and / or between the lower surface of the cup and the inner surface portion of the container.

 As the heat insulating material, a material that is inert to the gas generating agent, nonflammable, and withstands high temperatures is used. As a material that satisfies this condition, one or more of graphite sheet, ceramic fiber, ceramic molded product, heat-resistant polymer, and foamed gold) s, and gold-coated foil product are preferable.

 As described above, when the combustion of the gas generating agent becomes less susceptible to the shadow W of the ambient temperature, there is no need to select the gas generating agent in consideration of the shadow from the ambient temperature. ADCA (azodicarbonamide) ) And TAGN (triaminoguanidine nitrate), etc., it is also possible to use non-azide soda gas generators with a high gasification rate. In addition, when a non-azide gas generator is used, the coolant filter required for using a sodium azide gas generator that generates sodium-based high-temperature residues can be omitted. Become a boat. By expanding the range of selection of gas generating agents in this way, it is possible to reduce the size of the gas generating system and make it more efficient.

As the non-azide soda gas generating agent having a high gasification rate, a nitrogen-containing compound is used as a gas generating component, and an oxidizing agent mainly containing nitrate is combined. There is something.

 Examples of the nitrogen-containing compound include one or more selected from the group consisting of a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, and a triazole derivative.

 Specific examples of these include azodicarbonamide (ADCA), guadin, triamino guanidine nitrate (TAGN), guanidine diacid, guanidine carbonate, tetrazole, 5-aminonotetrazole, 5 , 5'-Ib-IH-tetrazole, 5-oxo-1,2,4-triazole, hexamethylenetetramidine, dicyandiamide, biuret, hydrazine. Lipohydrazide, oxalic acid dihydrazide. And so on.

Among them, it is obtained by reacting a compound having one NH ₂ group or one NH— in the structural formula with an organic compound having one CH 0 group in the structural formula or a compound capable of generating one CH 0 group. Reaction products are preferred examples o

 In particular, a gas generating agent obtained by reacting a compound having one NH, group or one NH- in the structural formula with an organic compound having one CH 0 group in the structural formula is a preferable gas from the viewpoint of handling safety. It is a generator.

Specific examples of compounds in this structure having an NH _a group or one NH- is § zone dicarboxylic Ami de (ADCA), Guayujin, Application Benefits amino Guaniji N'nai tray preparative (TAGN).确酸Guayujin, carbonate guanidine 5-1 Tetrazol. 5-Aminothetrazole, 5, 5'-B IH-Tetrazol. 5-Position 1, 2, 4-Triazole. To + Samethylene tetramin. Dicyandiamide, Biuret, Hydra Gin, phenol hydrazide, oxalic acid dihydrazide, hydrazine hydrochloride, urea, melamine, etc., and these can be used alone or in combination of two or more. Specific examples of the organic compound having one CH 0 group in the above structural formula include formaldehyde (methanal, hereinafter the formal name in parentheses). Ataldehyde (ethanal), p13bionaldehyde (propanal). 'n-Butyl aldehyde (butanal), n-vureal aldehyde (Ventanal), n-force n-aldehyde (Hexan zanard), acrolein (Pu-benal), k-ton aldehyde (2 Butenes, etc.) · Glyoxal etc. These are used alone or in combination of two or more.

Specific examples of the organic compound capable of forming one CH 0 group include paraformaldehyde H 0 (CH _a 0) n H. Trioxane (CH _a 0) _s , hexamethylene tetraamine (CH,) ε These are used alone or in combination of two or more.

 Specific examples of the above-mentioned oxidizing agent include sodium nitrate, potassium nitrate, barium nitrate, ammonium nitrate and strontium nitrate.

Brief description of the screen

FIG. 1 is a cross-sectional view of a gas generator of the present invention, FIG. 2 is a cross-sectional view of another gas generator of the present invention, and FIG. 30 is a cross-sectional view of still another gas generator of the present invention. FIG. 4 is a cross-sectional view, FIG. 4 is a graph showing characteristics of gas pressure and temperature of the gas generator according to Example 1, and FIG. 5 is a gas pressure of the gas generator according to Comparative Example 1. FIG. 6S is a graph showing characteristics of gas pressure and temperature of the gas generator according to Comparative Example 2, and FIG. 7 is a graph showing characteristics of other gases of the present invention. FIG. 8 is a sectional view of a generator, FIG. 8 is a sectional view of still another gas generator according to the present invention, and FIG. 9 is a sectional view of a conventional gas generator. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the gas generating system 4 of the present invention. In FIG. 1, the same portions as those in the conventional example in FIG. 9 are denoted by the same reference numerals, and description thereof will be omitted.

 The difference from FIG. 9 is that the heat insulating members 22 and 23 are provided on the upper surface and the lower surface of the annular forceps 50. The other different parts are that the coolants 25 and 26 are removed, the bottom of the inner wall 31 extends to the bottom of the container 21, and the gas generating agent storage space is enlarged, and The orifice 32 is provided on the side surface.

 The heat insulating material 22, 23 is an outer chamber 3 in which the gas generating agent 51 stored in the outer chamber 35 of the gas generator container is the node closest to the outermost wall of the vessel 21. It is crotched up and down inside 5.

 In this case, since the gas generating agent 51 is housed in the three-way forceps 50 provided in the outer chamber 35, the heat insulating material 22. Side and upper and lower surfaces. The heat insulating material 23 is disposed inside the upper surface side of the power bar 50 and is in contact with the gas generating agent 51. The heat insulating material 22 is arranged inside the lower surface side of the power tube 50 and is in contact with the gas generating agent 51. In this manner, since no other node material is interposed between the heat insulating members 22 and 23 and the gas generating agent 51, the gas generating agent storage space and its surroundings are reliably insulated. In addition, if the material is capable of bursting when gas is generated, it is desirable to provide a heat insulating member also on the surface with respect to the orifices 33, 32.

As the heat insulating member 22.23, a material which is inert to the gas generating agent 51, is nonflammable, and can withstand high temperatures is used. Products that meet this condition include lead sheets, ceramic fibers, ceramic molded products, One or more of heat-resistant polymers, foamed gold JS, and gold JS foil seed layer products are preferred.

 The main body and the throat body of the gas generant power tap 50 are formed of aluminum foil. ttThe bottom of the cup 50 is placed on the inner wall 31. The inner peripheral side surface of the »-shaped cup 50 has a gap with the inner wall 28a, and the annular force is The outer peripheral side surface of the bush 50 also has a space between the upright wall 8P of the inner wall 31 and the asperity.

 Next, the operation of the gas generator 4 having the above-described configuration will be described. The squib 10 is ignited, and the hot gas generated by burning the igniting agent 41 blows out through the orifice 33. This high-temperature gas penetrates the gas generating agent cup 50 and ignites the gas generating agent 51. A large amount of gas generated by the combustion of the gas generating agent 51 passes through the orifice 32 of the inner wall 31 and reaches the filter 30. Further, the slag contained in the gas is removed by the filter 30 as necessary, and the slag is discharged into the airbag (not shown) from the discharge hole 36.

 The gas generator 4 as described above is composed of the upper and lower surfaces of the container 21 and the force tube 50 closest to the container 21 which are greatly affected by the temperature from the outside of the gas generator 4, and the outside. The gas generating agent 51 stored in the chamber 35 is insulated by the thermal insulation materials 22, 23. Therefore, the range in which the temperature of the gas generating agent storage space fluctuates is narrower than the range in which the temperature of the container 21 fluctuates, and the temperature of the gas generating agent storage space at the start of combustion may be within a predetermined range. it can. After the start of combustion, the heat exchange between the high-temperature gas generated by the heat insulating material 22.23 and its surroundings, or the heat exchange between the gas generating agent itself and the vessel wall is reduced, and the self-contained operation is completed. Enables combustion. As a result, a predetermined range of burning speed is obtained.

Thus, the gas generator 4 described above has a small change in the combustion rate of the gas generating agent 51 even when the ambient temperature is as low as 140 ° C. to the S temperature of + 85 ° C. It enables safe and reliable operation of the air bag.

 In addition, as described above, gas generators that have little effect on the gas generating agent storage space from the ambient temperature must use the gas generating agent in consideration of the effect from the ambient temperature.

There is no need to remove sulfur, and it is possible to use a gas generating agent with a high gasification rate, a gas generating agent with a low calorific value during combustion, and various chemicals instead of sodium azide. Use of a gas generating agent with a high gasification rate reduces the required amount of gas generating agent to 5

Reduce the amount of conventional azide-based gas generating agent to 0% or less, contributing to downsizing of the entire gas generator and β-quantification.

 It is appropriate to provide the heat insulating member 22.23 so as to surround the entire space in which the gas generating agent 51 is housed, since the transfer of heat to the surroundings is minimized. However, as described above, the heat-insulating members 22 and 23 disposed above and below the outer chamber 35 are provided with the container 21 and the heat-receiving member 21 which receive a large amount of temperature shadow from the outside of the gas generator 4 as described above. Since the upper and lower surfaces of the forceps 50 closest to the container 断 熱 are insulated from the gas generating agent 51 stored in the outer chamber 35, a heat insulating node is provided. In comparison with a conventional gas generator that does not have the above, the influence of the ambient temperature of the container 21 and the like on the gas generating agent storage space is sufficiently reduced.

 In addition, the heat insulating members 22 and 23 of the gas generator 4 of the above embodiment are provided with a heat insulating member 22.23 and a gas insulating material in order to surely insulate the gas generating agent 51 and its surroundings. It is placed inside the force switch 50 so that no other member is interposed in the ffl with the generator 51. However, if at least a portion of the cup 24 is formed of a low heat capacity S member such as a wire mesh, the maturing member 38.3, as in the gas generator shown in FIG. 2 or FIG. 7 can be provided outside the forceps 24.

The gas generator 5 shown in FIG. 2 is an example in which the heat insulating nodes 38 and 37 are provided so as to directly contact the upper and lower surfaces of the power tube 24 outside the power window 24. Is shown.

 In the gas generating Si 2 shown in FIG. 30, the inner wall orifice 32 is crotched below the gas generating agent storage power tube 24 as in the conventional case, and the inner wall orifice 32 extends outside the lower surface of the power tube 24. However, the case where it is difficult to directly arrange the insulation material 37 is shown. In this case, a heat insulating member 3 is provided between the upper surface of the forceps 24 and the inner surface of the container 21 and between the lower surface of the forceps 24 and the inner surface of the container 21. 7 and 38 are provided.

 In this way, it is possible to insulate the container 21 and the power tube 24 for storing the gas generating agent 51, and the effect of the temperature of the container 21 on the combustion state of the gas generating agent 51 is β Destroyed.

 The heat insulating material 38 is attached to the ceiling of the upper container 28 located on the upper side of the inner surface of the container S 21, and is in contact with the gas generating agent tube 24. The cutout member 37 is attached to the bottom of the lower container 27 located on the lower side of the inner surface of the container 21. The lower surface of the gas generating agent cap 24 faces the heat insulating material 37 via the inner wall 31 having the opening of the smart press 32. In addition, the heat insulating member 37 at the bottom has a bent portion 37 a that is in contact with the lower inner peripheral surface of the container 21.

 The body of the gas generant tub 24 is formed of a wire mesh, and the lid is formed of aluminum foil. The bottom of the wire mesh rests on the inner wall 31. The inner peripheral side surface of the »-shaped forceps 24 formed of a wire mesh has a gap with the inner cylinder 28a, and the outer peripheral side surface of the cup 24 also has an inner wall 3 1 standing wall 3 It has a gap with 1a. The lid is pressed down by a heat insulating member 38.

Next, the operation of the gas generator 2 having the above-described structure will be described. The squib 10 is ignited, and the hot gas generated by burning the igniting agent 41 blows out through the orifice 33. This hot gas strikes the wire mesh of the gas generant tube 24. Gas generator 51 is ignited. The heavy gas generated by the burning of the gas generating agent 51 floods the orifice 32 and hits the heat insulating member 37 attached to the bottom of the lower container 27 as shown by the arrow ① . As shown by the arrow こ の, this gas reaches the filter 30 via the passage 31 b around the inner wall 31. Further, as shown by the arrow ③, the slag contained in the gas is removed by the filter 30 as required, and is discharged from the discharge hole 36 into the airbag (not shown).

 In the gas generator 2 described above, since the groom portion of the gas generating agent tube 24 is formed of gold 8, the heat capacity is smaller than that of a metal plate. Therefore, the temperature of the empty ffl containing the gas generating agent 51 is hardly affected by the temperature of the gas generating agent 24, and the generated gas or the gas generating agent itself is The degree of cooling by the generator cup 24 is also reduced, and the degree of change in the combustion rate of the gas generator 51 is further reduced. As such a low heat capacity S, it is possible to use a cup made of a carbon fiber woven nep in addition to a wire mesh forcep.

 As the wire mesh that fulfills the above-mentioned functions, a wire mesh made of stainless steel and having a coarse mesh is preferable, but an iron wire or a mesh may be used.

Next, the gas pressure and temperature characteristics of the gas generator 2 in which most of the above-described gas generating agent cap 24 is formed of a wire mesh will be described by comparing an experimental example and a comparative example. As actual眹例1, using a gas generator of the structure of Figure 3, as the gas generating agent ADCA (§ zone dicarboxylic amino-de) / KN 0 _s Roh KC 1 O s of powder of S i rubber by Sunda one 20 g of 1.5 mm diameter granulated particles were used. This gas generating agent is an oxidizing agent of non-aged sigma genate, and generates a small amount of heat. Comparative Example 1 basically uses a gas generator having the structure shown in FIG. 3, but the gas generating agent tub is formed of a 0.5 mm thick punching metal instead of a wire mesh. Relatively hot There are many S. In Comparative Example 2, the conventional gas generator shown in FIG. 9 was used. The gas generating agents in Examples 1 and 2 are the same as in Example 1. The fi degree around the gas generator of Example 1 and Comparative Example 1.2 is always fi. FIGS. 4, 5, and 6 are gas pressure and temperature characteristic diagrams of the gas generator, and show the results of a test using a 60 liter tank. The solid line indicates the rise in pressure in tank 、, and the dashed line indicates the rise in gas temperature in the tank. FIG. 4 corresponds to Experimental Example 1, FIG. 5 corresponds to Comparative Example 1, and FIG. 6 corresponds to Comparative Column 2. In conventional gas generators, as shown in Fig. 6, the rise in gas temperature and the rise in gas pressure remain slow and low, and the burning rate of the gas generating agent is significantly reduced. . As shown in Fig. 5, heat insulating members are placed on the upper and lower surfaces outside the gas generating agent cap, and the gas tub is formed by punching metal and has a relatively large heat capacity. The rate of increase in gas temperature and gas pressure has been improved, and the burn rate of gas generants has increased. However, the heat capacity of the gas generant cup is large, and the renovation of the rise in gas temperature and the rise in gas pressure is insufficient. As shown in FIG. 4, a gas generator in which a heat insulating material is arranged on the upper surface and the lower surface outside the gas generating agent cap and the main part of the gas generating agent cup is formed by a wire mesh, The degree of increase in gas temperature and gas pressure has been greatly improved, and the burning rate of the gas generating agent has been increased, thus achieving the desired gas generator characteristics. As described above, even a gas generating agent containing an oxidizing agent containing a non-oxohalogenate as a main component, which has been considered to be unusable in the past, can be used in a gas generator and replaces sodium azide. Enables the use of various drugs. Expanding the range of selection of gas generating agents makes it possible to significantly reduce the size and weight of gas generators.

For example, the most preferable example of a gas generator capable of miniaturization and β-quantification is In addition, there are gas generators that use ADCA, TAGN (triamino guanidine nitrate), and 51-aminotetrazole to store gas generating agents with a high gasification rate. In the case of a gas generating agent having a high gasification rate using ADCA, TAGN, 5-aminotetrazole or the like, there is no need to use a coolant for removing the residue, and the structure is discarded. A gas generator 6.3 using such a gas generating agent is shown in FIGS. 7S and 8.

 7 and 80, the gas generators 6 and 3 have a structure in which the lower container 101 and the upper container 102 are fixed with bolts 103 to form the container 21. At the center of the lower container 101, a bag-shaped protrusion 101a is formed, and the squib 10 is housed in the protrusion 1D1a, and the retainer 104 is screwed in and fixed. It has become. An ffi body 105 is fitted around the protruding ffi 101 a, and an ignition agent tube 40 is housed in the cylindrical body 105. Between the body 105 and the upper container 102, a cushion material 106 is provided. The cushioning material 106 presses the ignition agent power supply 40 and the gas generating agent power supplies 50 and 24 described below against the container 21 so that there is no play. .

 An orifice 109 is opened obliquely downward in the body 105, and a number of small-diameter discharge holes 36 are opened in the outer periphery of the upper container 102. An annular gas generant tube 24.50 is housed in the gas generant container 21 so as to surround the cylindrical body 105. Further, a gas retention space 111 having neither a coolant nor a filter is formed between the outer peripheral side surface of the gas generating agent tube 24.50 and the inner surface portion of the side surface of the container 21. The gas retention space 111 is a space for equally dividing the gas from the gas generating agent ports 24, 50 toward the discharge holes 36 by E.

In addition, a ripening member 108 serving also as a rupture sheet is provided on the inner side of the container 21 so as to close the discharge hole 36. You. When a heat insulating member sheet 108 having flexibility, such as a black sheet, is used for a rapture, the sheet is sequentially broken according to the internal pressure and the opening area is increased. Therefore, the internal pressure can be adjusted by adjusting the thickness of the ripened member 108 that closes the discharge hole 36.

 The gas generator 6 shown in FIG. 70 is provided with a heat insulating member 22.23 on the upper surface and the lower surface inside the annular forcep 50 made of aluminum foil. The insulating material 22 and 23 are composed of the upper and lower surfaces of the container 21 and the cup 50 closest to the container 21 and the container 21 which are most affected by temperature from the outside of the gas generator 6, and the gas generation. It insulates the space where the agent is stored. The heat insulating members 22 and 23 are stiffened so that no other members are interposed between the heat insulating member and the gas generating agent, in order to reliably insulate the gas generating agent and its surroundings. 50 fi is arranged inside. The heat insulating materials 22 and 23 are formed of a graphite sheet.

 The gas generator 3 shown in FIG. 8 has an annular force ring 24 formed of a wire mesh. The heat insulating members 37 and 38 are attached to the inside and the upper and lower surfaces of the container 21. The gas generating agent tube 24 entirely formed of a wire mesh is housed in a space surrounded by the heat insulating members 37, 38, and a heat insulating member 108 also serving as a rupture sheave. Have been.

According to the gas generators 6 and 3 described above in FIGS. 7 and 8, the squib 10 ignites, the igniting agent 41 burns, and the hot gas blows out of the orifice 1D9. The gas generating agent 51 is burned through the cup 50.24. The gas from the gas generating agent cups 50 and 24 is equally divided into E toward the discharge hole 36 in the gas retaining space 11 1. Then, when the gas pressure in the container 21 rises to a certain limit, the heat insulating material 108 blocking the discharge hole 36 is sequentially broken and opened. As the gas flow rate increases, the number of open discharge holes 36 increases and the opening area increases. Therefore, in container 2 1 The pressure rise is kept to a certain limit and maintained at a predetermined pressure within 100 bar for a certain time.

 The gas generators 6 and 3 have a minimum size of ignition means 40 and 10 and gas generators 50 and 24 in the enclosure 21 and can be miniaturized. It is. Availability in industrial draft

 As described above, the gas generator according to the present invention is provided with a heat insulating material at least in the vicinity of the gas generating agent storage space, that is, at least above, and Z or below, in the outer chamber of the gas generator container. The shadow W on the gas generator storage space received from the engine is reduced, and it is possible to obtain a combustion speed in a predetermined range. Therefore, there is no need to select a gas generating agent in consideration of the shadow W from the ambient temperature, and there are various alternatives to a gas generating agent with a high gasification rate, a gas generating agent with low heat generation during combustion, and sodium azide. It is most suitable as a gas generator that makes use of chemicals etc. fool. Further, since the amount of the gas generating agent used and the extra members of the gas generator can be eliminated by removing the gas generating agent, the gas generating device is optimal as a gas generator capable of achieving downsizing and improvement.

Claims

Claim eyelashes  1. From the central chamber (34), the annular outer chamber (35) which communicates with the central chamber (34) and surrounds the central chamber (34), and the R outer chamber (35) to inflate the airbag. A short oval container (21) having a discharge hole (36) for discharging gas;  A gas generating agent (51> stored in the annular outer chamber (35>);  A igniter S (10, 40) housed in the central chamber (34) for burning the S gas generating agent (51);  Insulating material provided at least above and / or below the outer chamber (35) to insulate the gas generating agent (51) in the outer chamber (35) and the container (21). (22, 23) (37.38) A gas generator for airbags.  2. Crotch an annular forceps (50) into the outer chamber (35) of the container (21) to contain the gas generating agent, above the outer chamber (35), and Z or A gas generator for an airbag as described in item 1 of the range of need, in which a lower heat insulating member (22, 23) is provided inside a »power cup (50).  3. An annular forceps (24) is put in the outer chamber (35) of the container (21) for storing the gas generating agent, and the upper part of the outer chamber (35), and Z or The gas generator for an airbag according to claim 1, wherein a lower heat insulating member (37, 38) is cast outside the cup (24).  4. The gas generator for an air bag according to claim 3, wherein at least a part of the forceps (24) is formed of a low heat capacity material such as a wire mesh.  5. Said Jiro (22, 23) Power ^ Graphite sheet, ceramic fiber, ceramic molded product, heat-resistant polymer, foamed gold, gold JS foil laminated product 2. The gas generator for an airbag according to item 1, wherein 6. The airbag according to any one of claims 1 to 5, wherein the gas generating agent is a combination of a humectant compound as a gas generating component and an oxidizing agent containing nitrate as a main component. For gas generator. 7. The gas generating composition according to claim 6, wherein the chamber-containing compound is at least one of a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine K conductor, and a triazole derivative. .  8. The oxidizing agent is one or more selected from the group consisting of sodium nitrate, potassium nitrate, barium nitrate, ammonium nitrate, and strontium nitrate. 7. The gas generator according to claim 6, which is of two or more types.