JPH08268209A - Gas generator - Google Patents
Gas generatorInfo
- Publication number
- JPH08268209A JPH08268209A JP7099803A JP9980395A JPH08268209A JP H08268209 A JPH08268209 A JP H08268209A JP 7099803 A JP7099803 A JP 7099803A JP 9980395 A JP9980395 A JP 9980395A JP H08268209 A JPH08268209 A JP H08268209A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- combustion chamber
- hole
- generating agent
- main combustion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 123
- 238000001816 cooling Methods 0.000 claims abstract description 29
- 239000000126 substance Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 33
- 239000002826 coolant Substances 0.000 abstract description 12
- 150000001540 azides Chemical class 0.000 abstract description 5
- 238000005192 partition Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- KPTSBKIDIWXFLF-UHFFFAOYSA-N 1,1,2-triaminoguanidine Chemical compound NN=C(N)N(N)N KPTSBKIDIWXFLF-UHFFFAOYSA-N 0.000 description 2
- 239000004156 Azodicarbonamide Substances 0.000 description 2
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 2
- 235000019399 azodicarbonamide Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 150000003536 tetrazoles Chemical class 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Landscapes
- Air Bags (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車の乗員保護装置
であるエアバッグを膨張させるためのガス発生器に係わ
り、特に非アジ化系のガス発生剤を使用するものに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas generator for inflating an airbag, which is a vehicle occupant protection device, and more particularly to a gas generator using a non-azidating gas generating agent.
【０００２】[0002]
【従来の技術】この種のガス発生器は、容器中にガス発
生剤を収納し、点火部材からの発生熱で該ガス発生剤を
燃焼させてガスを発生せしめ、この発生ガスを冷却部材
で適温に冷却してエアバッグに供給するものである。そ
して、ガス発生剤として、以前はアジ化系のものが使用
されていたが、近年、対環境性の観点から非アジ化系の
ものが使用されるようになってきた。代表例としては、
トリアミノグアニジン系、アゾジカルボンアミド系、テ
トラゾール系等がある。そして、アジ化系が無機物系で
あるのに対し、非アジ化系は有機物系であり、その燃焼
過程には未だ解明されていない点が多い。従って、これ
ら非アジ化系のガス発生剤を使用したガス発生器におい
て、該ガス発生剤を最適に燃焼させる構造は未だ確立さ
れていないのが実情である。2. Description of the Related Art A gas generator of this type stores a gas generating agent in a container, burns the gas generating agent with heat generated from an ignition member to generate a gas, and the generated gas is cooled by a cooling member. It is cooled to an appropriate temperature and supplied to the airbag. As the gas generating agent, an azide type was used before, but in recent years, a non-azide type has been used from the viewpoint of environmental resistance. As a typical example,
Examples include triaminoguanidine type, azodicarbonamide type, and tetrazole type. And, while the azide system is an inorganic system, the non-azide system is an organic system, and there are many points that have not yet been clarified in its combustion process. Therefore, in the gas generator using these non-azidinated gas generating agents, the structure for optimally burning the gas generating agents has not yet been established.
【０００３】[0003]
【発明が解決しようとする課題】ところで、非アジ化系
のガス発生剤を使用すると、以下のような問題点があ
る。すなわち、図６に示すように、燃焼室２８に収納さ
れたガス発生剤２０が図示されない点火部材の発生熱で
着火した際、非アジ化系のガス発生剤２０は有機物系で
あることから低温で分解が起こり、ガス発生剤２０の燃
焼過程でガス孔２７から燃焼不十分なまま（例えば溶融
状態で）流出する場合がある。そこで、例えば図示する
ように冷却室１４が隣接しており、ガス孔２７の出口近
傍に冷却材２１が配置されていると、流出したガス発生
剤の未燃物（点線）が冷却部材２１で冷却されて燃焼停
止状態となって燃焼が不安定化するという問題点があ
る。If a non-azidating gas generating agent is used, the following problems occur. That is, as shown in FIG. 6, when the gas generating agent 20 housed in the combustion chamber 28 is ignited by the heat generated by an ignition member (not shown), the non-azidating gas generating agent 20 is an organic substance, so that the temperature is low. In some cases, decomposition may occur, and in the combustion process of the gas generant 20, the gas may flow out from the gas holes 27 with insufficient combustion (eg, in a molten state). Therefore, for example, as shown in the drawing, when the cooling chambers 14 are adjacent to each other and the cooling material 21 is arranged near the outlet of the gas hole 27, the unburned substance (dotted line) of the gas generating agent that has flowed out is the cooling member 21. There is a problem that it becomes cooled and becomes in a combustion stopped state, and the combustion becomes unstable.
【０００４】本発明は、従来の技術の有するこのような
問題点に鑑みてなされたものであり、その目的とすると
ころは、非アジ化系のガス発生剤を使用してもその燃焼
を安定化できるガス発生器を提供することにある。The present invention has been made in view of the above problems of the prior art, and its object is to stabilize the combustion even when a non-azidating gas generating agent is used. It is to provide a gas generator that can be turned into a gas.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明におけるガス発生器は、耐圧性を有するハウ
ジング中に、点火部材と、該点火部材の発生熱で内部に
収納する有機物を主成分とするガス発生剤を燃焼させて
ガスを発生せしめる主燃焼室と、前記発生したガスを冷
却するための冷却材を収納する冷却室と、前記冷却され
たガスを放出するためのガス放出孔とを備えたガス発生
器において、前記主燃焼室とは第１ガス孔で連通し、さ
らに前記冷却室とは第２ガス孔で連通した副燃焼室を前
記主燃焼室と冷却室との間に介在させるとともに、少な
くとも前記第１ガス孔又は第２ガス孔のいずれかに、前
記主燃焼室又は該主燃焼室及び前記副燃焼室の所定の内
圧で破裂するまで該主燃焼室又は該主燃焼室及び該副燃
焼室を封止する第１破裂板が設けられたものである。In order to solve the above-mentioned problems, a gas generator according to the present invention comprises an ignition member and an organic substance contained therein by heat generated by the ignition member in a housing having pressure resistance. A main combustion chamber that burns a gas generating agent as a main component to generate a gas, a cooling chamber that stores a coolant for cooling the generated gas, and a gas discharge for discharging the cooled gas And a sub-combustion chamber that communicates with the main combustion chamber through a first gas hole and a second gas hole that communicates with the cooling chamber through a second gas hole between the main combustion chamber and the cooling chamber. The main combustion chamber or at least one of the first gas hole or the second gas hole until it bursts at a predetermined internal pressure of the main combustion chamber or the main combustion chamber and the auxiliary combustion chamber, while being interposed therebetween. Sealing the main combustion chamber and the auxiliary combustion chamber In which rupturable plate is provided.
【０００６】また、前記第１ガス孔に前記第１破裂板が
設けられ、前記第２ガス孔に、前記副燃焼室の所定の内
圧で破裂するまで該副燃焼室を封止する第２破裂板が設
けられたものとすることができる。Further, the first burst plate is provided in the first gas hole, and the second burst hole seals the sub-combustion chamber in the second gas hole until it bursts at a predetermined internal pressure of the sub-combustion chamber. It may be provided with a plate.
【０００７】また、前記第２ガス孔の径は前記第１ガス
孔の径より小さいものとすることができる。Further, the diameter of the second gas hole may be smaller than the diameter of the first gas hole.
【０００８】また、前記第２ガス孔は、前記第１ガス孔
の軸線延長上以外の部分に設けられているものとするこ
とができる。Further, the second gas hole may be provided in a portion other than the axial extension of the first gas hole.
【０００９】[0009]
【作用】上記構成によれば、燃焼過程で主燃焼室から流
出したガス発生剤の未燃分は副燃焼室に拘束されそこで
燃焼する。従ってガス発生剤の燃焼が安定化される。According to the above construction, the unburned portion of the gas generant flowing out from the main combustion chamber during the combustion process is restrained in the auxiliary combustion chamber and burns there. Therefore, the combustion of the gas generating agent is stabilized.
【００１０】また、第１ガス孔に第１破裂板が設けら
れ、第２ガス孔に、副燃焼室の所定の内圧で破裂するま
で該副燃焼室を封止する第２破裂板が設けられたものと
すると、副燃焼室に流出したガス発生剤の未燃物を該副
燃焼室に、より確実に拘束してその燃焼を一層安定化す
ることができる。A first rupturable plate is provided in the first gas hole, and a second rupturable plate is provided in the second gas hole to seal the auxiliary combustion chamber until it ruptures at a predetermined internal pressure of the auxiliary combustion chamber. With such a configuration, the unburned substances of the gas generating agent that have flowed out to the auxiliary combustion chamber can be more reliably restrained in the auxiliary combustion chamber to further stabilize the combustion.
【００１１】また、第２ガス孔の径は第１ガス孔の径よ
り小さいものとすると、第１ガス孔から流出したガス発
生剤の未燃分が副燃焼室に拘束されやすくなり、また副
燃焼室から冷却室へのガスの流れが分散化されてガス発
生剤の燃焼が全体としてより安定化される。If the diameter of the second gas hole is smaller than that of the first gas hole, the unburned component of the gas generant flowing out from the first gas hole is likely to be restrained in the auxiliary combustion chamber, and The gas flow from the combustion chamber to the cooling chamber is dispersed, and the combustion of the gas generant is more stabilized as a whole.
【００１２】また、第２ガス孔は、第１ガス孔の軸線延
長上以外の部分に設けられているものとすると、主燃焼
室から冷却材に至る経路が長くなり、主燃焼室から流出
するガス発生剤の未燃分が副燃焼室に拘束される確率が
高くなって、ガス発生剤の燃焼が全体としてさらに安定
化される。Further, if the second gas holes are provided in a portion other than the axial extension of the first gas holes, the path from the main combustion chamber to the coolant becomes long and flows out from the main combustion chamber. The probability that the unburned component of the gas generant is bound to the auxiliary combustion chamber is increased, and the combustion of the gas generant is further stabilized as a whole.
【００１３】[0013]
【実施例】以下、本発明の実施例について図面を参照し
つつ説明する。まず第１実施例をを図１により説明す
る。図１は第１実施例のガス発生器の構成を示す断面図
である。Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment will be described with reference to FIG. FIG. 1 is a sectional view showing the structure of the gas generator of the first embodiment.
【００１４】まず、構成を説明する。図１において、ガ
ス発生器１は、両端が閉鎖された円筒形状のハウジング
２を備えている。すなわち、円筒部材３は内部に軸方向
に段付きの円柱状空間を有しており、一端側に形成され
た点火部材収納部４にスクイブ等の点火部材５が収納さ
れ、円筒部材３に螺止される栓部材６により固定され、
さらに点火部材５のリード線８が栓部材６の中央に開口
する貫通孔７から外部に導出されている。一方、円筒部
材３の他端側に形成された３段の円柱状空間には、円板
状の第１仕切り部材９、短円筒状の第１押さえ部材１
０、円板状の第２仕切り部材１２、短円筒状の第２押さ
え部材１３が順に嵌挿され、該第２押さえ部材１３が円
筒部材３に螺止される蓋部材１５により固定されてい
る。これにより、奥から順に、主燃焼室８、副燃焼室１
１、冷却室１４が形成され、点火部材５と主燃焼室８と
は導孔１６で、主燃焼室８と副燃焼室１１とは第１仕切
り材９に開口する第１ガス孔１７で、副燃焼室１１と冷
却室１４とは第２仕切り部材１２に開口する第２ガス孔
１８でそれぞれ連通されている。そして、導孔８、第１
ガス孔１７及び第２ガス孔１８はいずれも円筒部材３の
中心に位置するように且つその軸方向に設けられてい
る。なお、第１ガス孔１７と第２ガス孔１８とは本実施
例では同一径とした。また、冷却室１４の端部の周壁に
はガス放出孔１９が開口している。主燃焼室８にはガス
発生剤２０が収納され、副燃焼室１１は空室であり、冷
却室１４には冷却材２１が充填されている。また、第１
ガス孔１７の手前には破裂板２２が配置されている。な
お、破裂板２２は第２ガス孔１８の手前に配置してもよ
い。First, the structure will be described. In FIG. 1, a gas generator 1 includes a cylindrical housing 2 whose both ends are closed. That is, the cylindrical member 3 has a cylindrical space with a step in the axial direction inside, and the ignition member 5 such as a squib is housed in the ignition member housing portion 4 formed at one end side, and the cylindrical member 3 is screwed. Fixed by the stopper member 6 to be stopped,
Further, a lead wire 8 of the ignition member 5 is led out to the outside from a through hole 7 opened in the center of the plug member 6. On the other hand, in the three-stage cylindrical space formed on the other end side of the cylindrical member 3, the disc-shaped first partition member 9 and the short cylindrical first pressing member 1 are provided.
0, a disk-shaped second partitioning member 12, and a short cylindrical second pressing member 13 are sequentially fitted and fixed by a lid member 15 screwed to the cylindrical member 3. . As a result, the main combustion chamber 8 and the auxiliary combustion chamber 1 are sequentially arranged from the back.
1. The cooling chamber 14 is formed, the ignition member 5 and the main combustion chamber 8 are the guide holes 16, and the main combustion chamber 8 and the auxiliary combustion chamber 11 are the first gas holes 17 opened in the first partition member 9. The sub-combustion chamber 11 and the cooling chamber 14 are communicated with each other through the second gas holes 18 opening in the second partition member 12. And the guide hole 8, the first
Both the gas hole 17 and the second gas hole 18 are provided in the center of the cylindrical member 3 and in the axial direction thereof. The first gas hole 17 and the second gas hole 18 have the same diameter in this embodiment. Further, a gas discharge hole 19 is opened in the peripheral wall at the end of the cooling chamber 14. A gas generating agent 20 is stored in the main combustion chamber 8, the auxiliary combustion chamber 11 is empty, and the cooling chamber 14 is filled with a coolant 21. Also, the first
A rupturable plate 22 is arranged in front of the gas hole 17. The rupture plate 22 may be arranged in front of the second gas hole 18.
【００１５】円筒部材３、栓部材６、第１、第２仕切り
部材９，１２、第１、第２押さえ部材１０，１３、蓋部
材１５にはＳＵＳ等の耐熱性金属材料が使用される。ガ
ス発生剤２０には、トリアミノグアニジン系、アゾジカ
ルボンアミド系、テトラゾール系等の非アジ化系有機物
が主成分として使用される。冷却材には、金網、スチー
ルウール等が使用される。A heat resistant metal material such as SUS is used for the cylindrical member 3, the plug member 6, the first and second partition members 9 and 12, the first and second pressing members 10 and 13, and the lid member 15. As the gas generating agent 20, a non-azidinated organic substance such as triaminoguanidine-based, azodicarbonamide-based, or tetrazole-based is used as a main component. Wire mesh, steel wool, etc. are used as the coolant.
【００１６】また、破裂板２２には例えばアルミ、ＳＵ
Ｓ等からなる金属箔、あるいはグラファイトシート等が
使用される。また、破裂板２２は、ガス発生剤２０の燃
焼初期において主燃焼室８の内圧が充分に上昇し、その
燃焼が安定するような圧力に至ると破裂するようにその
破裂強度が設定される。The rupturable plate 22 is made of, for example, aluminum or SU.
A metal foil made of S or the like, a graphite sheet or the like is used. Further, the rupture strength of the rupturable plate 22 is set so that the rupturable plate 22 ruptures when the internal pressure of the main combustion chamber 8 rises sufficiently in the initial stage of combustion of the gas generating agent 20 and reaches a pressure at which the combustion becomes stable.
【００１７】つぎに、作動を説明する。図１において、
点火部材５が発火すると、点火部材５の発生熱が導孔１
６を通って主燃焼室に入り（矢印）、ガス発生剤２０
が着火して燃焼する。すると、主燃焼室８は破裂板２２
で封止されているので、発生ガスによりその内圧は急上
昇し、ガス発生剤２０の初期における燃焼が安定化され
る。一方、ガス発生剤２０は有機物系であるので、この
着火の際に燃焼しつつ一部は融解する。そして、主燃焼
室８が上記の所定の内圧に至ると、破裂板２２が破裂
し、発生ガスは第１ガス孔１７を通って副燃焼室１１に
流出する。このとき、融解したガス発生剤２０の一部も
未燃焼のままガスとともに第１ガス孔１７から流出する
が、副燃焼室１１に拘束されて（矢印）、ここで滞留
する間に燃焼する（拘束は第２ガス孔１８のオリフィス
作用による）。該副燃焼室１１には冷却材は存在しない
ので、従来のように燃焼が停止することもなく、その燃
焼が安定化される（なお、副燃焼室１１内の冷却材につ
いては、許容されることもありうる）。そして、副燃焼
室１１を通過し、あるいは副燃焼室１１で発生したガス
は冷却室１４に流出し（矢印）、冷却材２１で適温に
冷却されて、ガス放出孔１９から図示されないエアバッ
グ中に供給される（矢印）。なお、破裂板２２が第２
ガス孔の手前に配置された場合でも同様であり、まず主
燃焼室８で第１ガス孔１７のオリフィス作用によって燃
焼の部分拘束が行われ、ついで副燃焼室１１で破裂板２
２による主拘束が行われて、ガス発生剤２０の燃焼が安
定化される。なお、冷却室１４の下流側にフィルタ室を
設けることも可能であり、その場合はガス放出孔１９は
フィルタ室に設けられることになる。Next, the operation will be described. In FIG.
When the ignition member 5 is ignited, the heat generated by the ignition member 5 is transferred to the guide hole 1
6 into the main combustion chamber (arrow), gas generating agent 20
Ignites and burns. Then, the main combustion chamber 8 becomes
Since it is sealed with, the internal pressure of the gas is rapidly increased by the generated gas, and the combustion of the gas generating agent 20 in the initial stage is stabilized. On the other hand, since the gas generating agent 20 is an organic material, it partially burns while burning during this ignition. Then, when the main combustion chamber 8 reaches the above-mentioned predetermined internal pressure, the rupture plate 22 ruptures, and the generated gas flows out to the sub combustion chamber 11 through the first gas holes 17. At this time, a part of the melted gas generating agent 20 also flows out of the first gas hole 17 together with the gas without being burned, but is restrained by the auxiliary combustion chamber 11 (arrow) and burns while staying there ( The restraint is due to the orifice action of the second gas hole 18). Since there is no coolant in the sub-combustion chamber 11, the combustion is not stopped unlike in the conventional case, and the combustion is stabilized (the coolant in the sub-combustion chamber 11 is allowed. There is also a possibility). Then, the gas passing through the sub-combustion chamber 11 or generated in the sub-combustion chamber 11 flows out to the cooling chamber 14 (arrow), is cooled to an appropriate temperature by the coolant 21, and is discharged from the gas release hole 19 into an airbag (not shown). (Arrow). The rupture plate 22 is the second
The same applies to the case of being arranged in front of the gas holes. First, partial restraint of combustion is performed in the main combustion chamber 8 by the orifice action of the first gas holes 17, and then in the auxiliary combustion chamber 11, the rupture plate 2
The main restraint by 2 is performed, and the combustion of the gas generant 20 is stabilized. It is also possible to provide a filter chamber on the downstream side of the cooling chamber 14, and in that case, the gas discharge hole 19 will be provided in the filter chamber.
【００１８】つぎに、本発明の第２実施例を図２により
説明する。図２は第２実施例のガス発生器の構成を示す
断面図である。図２において、図１と異なる点は、第１
ガス孔１７の手前に配置された第１破裂板２２に加え
て、さらに第２ガス孔１８の手前に第２破裂板２３が配
置された点である。このような構成とすると、副燃焼室
１１に流出したガス発生剤の未燃物を該副燃焼室１１で
二重に拘束して燃焼を安定化することができる。従っ
て、ガス発生剤２０全体の燃焼をさらに安定化すること
ができる。Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a sectional view showing the structure of the gas generator of the second embodiment. 2 is different from FIG. 1 in that
In addition to the first rupturable plate 22 arranged in front of the gas hole 17, the second rupturable plate 23 is arranged in front of the second gas hole 18. With such a configuration, it is possible to doubly restrain the unburned substance of the gas generating agent that has flowed into the auxiliary combustion chamber 11 in the auxiliary combustion chamber 11 to stabilize the combustion. Therefore, the combustion of the entire gas generant 20 can be further stabilized.
【００１９】つぎに、本発明の第３実施例を図３により
説明する。図３は第３実施例のガス発生器の構成を示す
断面図である。図３において、図２と異なる点は、第２
ガス孔２５が第１ガス孔１７より小径の小孔の集合から
構成されている点である。なお、第１ガス孔１７の総開
口面積と第２ガス孔２５の総開口面積は、前者の方が大
きく設定されており、また、第１破裂板２２と第２破裂
板２４との破裂圧力は破裂板を同一材質にして且つ後者
２４の厚みを薄くすることで略同一に設定されている。
このような構成とすると、圧力依存性をもつ薬剤の燃焼
過程が圧力一定で安定に制御されるほかに、第１ガス孔
１７から流出したガス発生剤の未燃物（点線）が副燃焼
室１１に拘束されやすく、また副燃焼室１１から冷却室
１４へのガスの流れが分散化されて冷却材の影響を受け
にくくなり、ガス発生剤２０の燃焼が全体としてより安
定化される。さらには冷却材によるガスの冷却そのもの
も効率化される。Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a sectional view showing the structure of the gas generator of the third embodiment. 3 is different from FIG. 2 in that
The gas hole 25 is composed of a collection of small holes each having a smaller diameter than the first gas hole 17. The total opening area of the first gas holes 17 and the total opening area of the second gas holes 25 are set to be larger in the former case, and the burst pressure between the first burst plate 22 and the second burst plate 24 is larger. Are set to be substantially the same by making the rupture plate the same material and thinning the latter 24.
With such a configuration, the combustion process of the pressure-dependent drug is stably controlled at a constant pressure, and the unburned substance (dotted line) of the gas generant flowing out from the first gas hole 17 is generated in the auxiliary combustion chamber. 11 is easily restrained, and the gas flow from the sub-combustion chamber 11 to the cooling chamber 14 is dispersed to be less affected by the coolant, so that the combustion of the gas generant 20 is more stabilized as a whole. Further, the cooling of the gas itself with the coolant is also made efficient.
【００２０】つぎに、本発明の第４実施例を図４により
説明する。図４は第４実施例のガス発生器の構成を示す
断面図である。図４において、図３と異なる点は、第２
ガス孔２７が、第１ガス孔１７の軸線延長（２６）上以
外の部分に設けられている点である。このような構成と
すると、主燃焼室８から冷却室１４に至る経路が長くな
り、主燃焼室８から流出するガス発生剤の未燃分が副燃
焼室１１に拘束される確率が高くなって、ガス発生剤２
０の燃焼が全体としてさらに安定化される。Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 is a sectional view showing the structure of the gas generator of the fourth embodiment. 4 is different from FIG. 3 in that
The gas hole 27 is provided at a portion other than the axial extension (26) of the first gas hole 17. With such a configuration, the path from the main combustion chamber 8 to the cooling chamber 14 becomes long, and the unburned portion of the gas generant flowing out from the main combustion chamber 8 is highly likely to be bound to the auxiliary combustion chamber 11. , Gas generant 2
The zero burn is further stabilized as a whole.
【００２１】つぎに、本発明の第５実施例を図５により
説明する。図５は第５実施例のガス発生器の構成を示す
模式断面図である。図５において、図１〜図４と主に異
なる点は、図１〜図４では点火部材５、主燃焼室８、副
燃焼室１１、冷却室１４を同一軸線上に配置したが、図
５ではこれら５、８、１１、１４を同芯状に半径方向に
配置した点である。なお、点火部材５については主燃焼
室８内に含まれる構成としている。このような構成とし
ても、図１〜図４のガス発生器と同様の効果を得ること
ができる。Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a schematic sectional view showing the structure of the gas generator of the fifth embodiment. 5 is different from FIGS. 1 to 4 mainly in that the ignition member 5, the main combustion chamber 8, the auxiliary combustion chamber 11, and the cooling chamber 14 are arranged on the same axis line in FIGS. The point is that these 5, 8, 11, and 14 are arranged concentrically in the radial direction. The ignition member 5 is included in the main combustion chamber 8. Even with such a configuration, the same effect as that of the gas generator of FIGS. 1 to 4 can be obtained.
【００２２】なお、上述の実施例において、主燃焼室８
及び／又は副燃焼室１１を例えばセラミック等の断熱部
材で覆ってもよい。このような構成とすると、環境によ
りガス発生器の温度が変化してもそれによる燃焼室８、
１１の温度変化を防止してガス発生剤２０の燃焼をより
安定化するのに有効である。この場合破裂板にグラファ
イトシートを用いると破裂板自体も断熱性を発揮するの
で、よりその効果が増す。例えば、副燃焼室についてい
えば、図３において、押さえ部材１０をセラミックス、
第２破裂板２３をグラファイトシートとすることで、容
易に本構成を実現することができる。In the above embodiment, the main combustion chamber 8
And / or the auxiliary combustion chamber 11 may be covered with a heat insulating member such as ceramic. With such a configuration, even if the temperature of the gas generator changes due to the environment, the combustion chamber 8,
This is effective in preventing the temperature change of 11 and stabilizing the combustion of the gas generating agent 20 more. In this case, if a graphite sheet is used for the rupture plate, the rupture plate itself also exhibits heat insulating properties, so that the effect is further enhanced. For example, regarding the auxiliary combustion chamber, in FIG. 3, the pressing member 10 is made of ceramics,
By using the graphite sheet as the second rupturable plate 23, this configuration can be easily realized.
【００２３】また、上述の実施例において、副燃焼室内
に白金などの触媒を担持したハニカム状セラミックスを
配置することもできる。このような構成とすると、発生
したガスがエアバッグ外へ排出された場合に問題となる
ＣＯ、ＮＯｘ等を削減することができる。Further, in the above-mentioned embodiment, it is also possible to dispose the honeycomb ceramics carrying a catalyst such as platinum in the auxiliary combustion chamber. With such a configuration, it is possible to reduce CO, NOx, etc., which become a problem when the generated gas is discharged to the outside of the airbag.
【００２４】[0024]
【発明の効果】本発明のガス発生器は上述のように、耐
圧性を有するハウジング中に、点火部材と、ガス発生剤
を収納する主燃焼室と、該主燃焼室から流出するガス発
生剤の未燃物を拘束して燃焼させるための副燃焼室と、
冷却室とを直列に配置し、少なくとも第１ガス孔又は第
２ガス孔のいずれかに、第１破裂板が設けられたもので
あるので、着火の際に分解し、燃焼過程で主燃焼室から
流出したガス発生剤を副燃焼室に拘束してそこで燃焼さ
せることができる。従って、非アジ化系のガス発生剤を
使用してもその燃焼を安定化することができる。As described above, the gas generator of the present invention has a pressure-resistant housing, an ignition member, a main combustion chamber that stores the gas generating agent, and a gas generating agent that flows out from the main combustion chamber. A sub-combustion chamber for restraining and burning the unburned substances of
Since the cooling chamber is arranged in series, and the first rupturable plate is provided in at least either the first gas hole or the second gas hole, it is decomposed at the time of ignition and is decomposed during the combustion process to the main combustion chamber. The gas generating agent flowing out of the chamber can be restrained in the auxiliary combustion chamber and burned there. Therefore, the combustion can be stabilized even if a non-azidating gas generating agent is used.
【００２５】また、第１ガス孔に第１破裂板が設けら
れ、第２ガス孔に、副燃焼室の所定の内圧で破裂するま
で該副燃焼室を封止する第２破裂板が設けられたものと
すると、副燃焼室に流出したガス発生剤の未燃物を該副
燃焼室により確実に拘束してその燃焼を一層安定化する
ことができる。A first rupture plate is provided in the first gas hole, and a second rupture plate is provided in the second gas hole to seal the auxiliary combustion chamber until it ruptures at a predetermined internal pressure of the auxiliary combustion chamber. With such a configuration, the unburned substances of the gas generating agent that have flowed out to the auxiliary combustion chamber can be reliably restrained by the auxiliary combustion chamber to further stabilize the combustion.
【００２６】また、第２ガス孔の径は第１ガス孔の径よ
り小さいものとすると、第１ガス孔から流出したガス発
生剤の未燃分が副燃焼室に拘束されやすくなり、さらに
副燃焼室から冷却室へのガスの流れが分散化されてガス
発生剤の燃焼が全体としてより安定化される。If the diameter of the second gas hole is smaller than the diameter of the first gas hole, the unburned component of the gas generant flowing out from the first gas hole is likely to be restrained in the auxiliary combustion chamber, and further The gas flow from the combustion chamber to the cooling chamber is dispersed, and the combustion of the gas generant is more stabilized as a whole.
【００２７】また、第２ガス孔は、第１ガス孔の軸線延
長上以外の部分に設けられているものとすると、主燃焼
室から冷却材に至る経路が長くなり、主燃焼室から流出
するガス発生剤の未燃分が副燃焼室に拘束される確率が
高くなって、ガス発生剤の燃焼が全体としてさらに安定
化される。Further, if the second gas holes are provided in a portion other than the axial extension of the first gas holes, the path from the main combustion chamber to the coolant becomes long and flows out from the main combustion chamber. The probability that the unburned component of the gas generant is bound to the auxiliary combustion chamber is increased, and the combustion of the gas generant is further stabilized as a whole.
【図１】本発明の第１実施例のガス発生器の構成を示す
断面図である。FIG. 1 is a cross-sectional view showing a configuration of a gas generator according to a first embodiment of the present invention.
【図２】本発明の第２実施例のガス発生器の構成を示す
断面図である。FIG. 2 is a sectional view showing the structure of a gas generator according to a second embodiment of the present invention.
【図３】本発明の第３実施例のガス発生器の構成を示す
断面図である。FIG. 3 is a sectional view showing the configuration of a gas generator according to a third embodiment of the present invention.
【図４】本発明の第４実施例のガス発生器の構成を示す
断面図である。FIG. 4 is a sectional view showing the structure of a gas generator according to a fourth embodiment of the present invention.
【図５】本発明の第５実施例のガス発生器の構成を示す
模式断面図である。FIG. 5 is a schematic sectional view showing the structure of a gas generator according to a fifth embodiment of the present invention.
【図６】従来のガス発生器の問題点を示す断面図であ
る。FIG. 6 is a cross-sectional view showing a problem of a conventional gas generator.
１ ガス発生器 ２ ハウジング ５ 点火部材 ８ 主燃焼室 １１ 副燃焼室 １４ 冷却室 １６ 導孔 １７ 第１ガス孔 １８、２５、２７ 第２ガス孔 １９ ガス放出孔 ２０ ガス発生剤 ２１ 冷却材 ２２ 第１破裂板 ２３、２４ 第２破裂板 1 Gas Generator 2 Housing 5 Ignition Member 8 Main Combustion Chamber 11 Secondary Combustion Chamber 14 Cooling Chamber 16 Guide Hole 17 First Gas Hole 18, 25, 27 Second Gas Hole 19 Gas Release Hole 20 Gas Generant 21 Coolant 22 Second 1 rupture disc 23, 24 second rupture disc
───────────────────────────────────────────────────── フロントページの続き (72)発明者 横手 信昭 兵庫県姫路市豊富町豊富3903−39 日本化 薬株式会社姫路工場内センサー・テクノロ ジー株式会社姫路テクニカルセンター内 (72)発明者 神田 剛 兵庫県姫路市豊富町豊富3903−39 日本化 薬株式会社姫路工場内センサー・テクノロ ジー株式会社姫路テクニカルセンター内 (72)発明者 伊藤 裕二 兵庫県姫路市豊富町豊富3903−39 日本化 薬株式会社姫路工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuaki Yokote 3903-39 Abundant, Tomicho, Himeji City, Hyogo Prefecture Nihon Kayaku Co., Ltd. Himeji Plant Sensor / Technology Co., Ltd. Himeji Technical Center (72) Inventor Go Kanda Hyogo 3903-39 Abundant, Tomicho, Himeji-shi, Japan Sensor / Technology in Nippon Kayaku Co., Ltd. Himeji Technical Center (72) Inventor Yuji Ito 3903-39, Abundant-cho, Himeji-shi, Hyogo Nihon Kayaku Co., Ltd. Himeji in the factory
Claims (4)
点火部材と、該点火部材（５）の発生熱で内部に収納す
る有機物を主成分とするガス発生剤（２０）を燃焼させ
てガスを発生せしめる主燃焼室（８）と、前記発生した
ガスを冷却するための冷却材（２１）を収納する冷却室
（１４）と、前記冷却されたガスを放出するためのガス
放出孔（１９）とを備えたガス発生器において、 前記主燃焼室（８）とは第１ガス孔（１７）で連通し、
さらに前記冷却室（１４）とは第２ガス孔（１８）で連
通した副燃焼室（１１）を前記主燃焼室（８）と冷却室
（１４）との間に介在させるとともに、 少なくとも前記第１ガス孔（１７）又は第２ガス孔（１
８）のいずれかに、前記主燃焼室（８）又は該主燃焼室
（８）及び前記副燃焼室（１１）の所定の内圧で破裂す
るまで該主燃焼室（８）又は該主燃焼室（８）及び該副
燃焼室（１１）を封止する第１破裂板（２２）が設けら
れたガス発生器。1. A housing (2) having pressure resistance,
An ignition member, a main combustion chamber (8) for generating a gas by combusting a gas generating agent (20) containing an organic substance as a main component, which is housed inside by the heat generated by the ignition member (5), and the generated gas In a gas generator having a cooling chamber (14) for containing a cooling material (21) for cooling the gas, and a gas discharge hole (19) for discharging the cooled gas, the main combustion chamber ( 8) communicates with the first gas hole (17),
Further, the auxiliary combustion chamber (11) communicating with the cooling chamber (14) through the second gas hole (18) is interposed between the main combustion chamber (8) and the cooling chamber (14), and at least the first combustion chamber (8) is provided. 1 gas hole (17) or 2nd gas hole (1
8) any of the main combustion chamber (8) or the main combustion chamber (8) or the main combustion chamber (8) or the main combustion chamber (8) and the sub-combustion chamber (11) until a burst occurs at a predetermined internal pressure. A gas generator provided with (8) and a first rupturable plate (22) for sealing the auxiliary combustion chamber (11).
板（２２）が設けられ、前記第２ガス孔（１８）に、前
記副燃焼室（１１）の所定の内圧で破裂するまで該副燃
焼室（１１）を封止する第２破裂板（２３）が設けられ
た請求項１に記載のガス発生器。2. The first rupturable plate (22) is provided in the first gas hole (17), and ruptures in the second gas hole (18) at a predetermined internal pressure of the auxiliary combustion chamber (11). The gas generator according to claim 1, further comprising a second rupture plate (23) for sealing the auxiliary combustion chamber (11).
ガス孔（１７）の径より小さいものである請求項１〜２
に記載のガス発生器。3. The diameter of the second gas hole (25) is the first diameter.
A gas having a diameter smaller than that of the gas hole (17).
The gas generator described in.
ス孔（１７）の軸線延長上以外の部分に設けられている
請求項１〜３に記載のガス発生器。4. The gas generator according to claim 1, wherein the second gas hole (27) is provided in a portion other than an axial extension of the first gas hole (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7099803A JPH08268209A (en) | 1995-03-31 | 1995-03-31 | Gas generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7099803A JPH08268209A (en) | 1995-03-31 | 1995-03-31 | Gas generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08268209A true JPH08268209A (en) | 1996-10-15 |
Family
ID=14257043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7099803A Pending JPH08268209A (en) | 1995-03-31 | 1995-03-31 | Gas generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08268209A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001074633A1 (en) * | 2000-04-03 | 2001-10-11 | Nippon Kayaku Kabushiki-Kaisha | Gas generator |
-
1995
- 1995-03-31 JP JP7099803A patent/JPH08268209A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001074633A1 (en) * | 2000-04-03 | 2001-10-11 | Nippon Kayaku Kabushiki-Kaisha | Gas generator |
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