WO2002062629A1

WO2002062629A1 - Gas generator

Info

Publication number: WO2002062629A1
Application number: PCT/JP2002/000916
Authority: WO
Inventors: Masahiro Yoshida; Yoshiyuki Kishino; Ryoi Kodama; Yasushi Matsumura
Original assignee: Nippon Kayaku Kabushiki-Kaisha
Priority date: 2001-02-07
Filing date: 2002-02-05
Publication date: 2002-08-15
Also published as: JP2002308040A

Abstract

A gas generator (P) comprising a cylinder (1) containing a high pressure gas, a cup-like housing (4) containing a transfer charge (2) and an ignition means (3), and an outer tube (5) for holding the cylinder (1) and the housing (4) while coupling, wherein the cylinder (1) and the housing (4) are held while being coupled such that a rapture disc (6) for hermetically sealing the cylinder (1) and keeping the pressure thereof faces the ignition means (3) contained in the housing (4) and the transfer charge (2) has a doughnut-like shape.

Description

Specification

Gas Generators '' Technical Field

The present invention relates to a _P background art related to a gas generator used for an airbag device of an automobile.

Airbags are known as one of the safety devices to protect the occupants of a car from the impact generated during a collision. This airbag operates with a large amount of high-temperature, high-pressure gas generated by a gas generator. Conventionally, there are generally two types of methods for generating gas in this gas generator. One is a pi-mouth system in which all generated gas is generated by the combustion of a solid gas generant. The other is a cylinder holding high-pressure gas and a large amount of high temperature by a small amount of gunpowder composition to supply heat to the high-pressure gas in this cylinder. is there.

In recent years, the performance required for gas generators is downsizing. In the former pie-mouth system, it is necessary to increase the number of moles of gas generated by combustion of the gas generating agent in the gas generator in order to realize the downsizing of the gas generator. As a gas generant composition for increasing the number of moles of gas generated by the gas generant, a gas generant composition containing guanidine nitrate as a fuel and ammonium nitrate as an oxidant in the composition is effective. is there. For example, as disclosed in Japanese Patent Application Laid-Open No. 11-292678, a guanidine derivative is used as a nitrogen-containing organic compound, phase-stabilized ammonium nitrate is used as an oxidizing agent, a pressure index regulator, and a silicon compound is used as a detonation inhibitor Are disclosed, respectively. However, because it contains a large amount of guanidine derivatives and ammonium nitrate, the burning rate is extremely slow.In order to obtain sufficient combustion performance in a gas generator, it is necessary to burn the gas generating agent at a higher pressure. was there. In addition, since the internal pressure during operation of the gas generator increases, the size of the gas generator tends to increase in order to have high strength.

In addition, in the case of a gas generating composition containing a low-reactive material such as guanidine derivative or ammonium nitrate as a composition, one of the problems is the low ignition rate of the gas generating agent in addition to the slow burning rate. . The time between the start of operation and the deployment of the airbag is about 30 to 6 Oms. Even a slight delay in the operation of the gas generator has a large effect, and it does not provide sufficient performance for occupant protection. If the ignitability of the gas generating agent is low, even if the igniter in the gas generator ignites, the time required for the gas generating agent to ignite becomes longer, resulting in a delay in ignition of the gas generator. By increasing the dose of the transfer agent for the gas generator, an improvement in ignition delay can be expected to some extent. However, the total amount of heat generated by the gas generator itself increases due to the increase in ignition charge. As a result, the weight of the cooling / filter member for cooling the high gas is increased, and the gas generator becomes larger. ·

—On the other hand, the hybrid type is suitable for miniaturization because only a small amount of gas generating agent is required. However, it is necessary to keep the gas in the cylinder at a high pressure for a long time. In general, after the useful life of the gas generator for 15 years has passed, the high-pressure gas may escape from the cylinder and may not be able to exhibit sufficient ^ fe capability. For this reason, it is necessary to seal the cylinder gas with a rupture disk with high mechanical breaking strength and high sealability because it is necessary to seal the gas in the cylinder for a long time. W

. An example of this type of gas generator is disclosed in Japanese Patent Application Laid-Open No. 8-253010. This gas generator uses a rupture diaphragm (rapture disk) with high breaking strength to increase the gas tightness of the first container (bomb) in which high-pressure gas is sealed. 5. The rupture diaphragm of the first container is ruptured reliably by pushing the hollow piston provided in the second container provided with the combustion chamber by the ignition of the propulsion charge (ignition means). This ensures that the high-pressure gas in the first container is released. In this way, the rupture diaphragm can be ruptured without fail, but it is necessary to install a hollow biston, etc., and there has been a problem that the structure of the gas generator is complicated.

In addition, instead of using a hollow biston or the like as disclosed in Japanese Patent Application Laid-Open No. Hei 8-253100, the rupture of a rupture disk for securely sealing a cylinder is performed, In some cases, the halo of the transfer agent increases and the pressure in the combustion chamber, including the ignition means, increases, causing rupture. However, it was difficult to reduce the size of the gas generator because a room for storing the explosive was required to reduce the amount of the explosive. Also, in this case, it was also difficult to destroy the love disk simultaneously with the ignition of the ignition means.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hybrid gas generator that satisfies both miniaturization and simplified structure.

20

Disclosure of the invention

The gas generator according to claim 1 of the present invention for solving the above-mentioned problem, comprises a cylinder filled with high-pressure gas, a cup-shaped housing containing a donut-shaped transfer charge and ignition means. A rupture disk that holds and seals the pressure of the cylinder, and a rupture disk that is in front of the cylinder so as to form a gas retention space between the cylinder and the housing. An outer tubular member for connecting and holding the housing and the housing, wherein the cylinder and the housing are connected and held such that the ignition means housed in the housing faces the ignition means. And

A hollow space is formed in the housing because the ignition means and the rupture disk that seals the high-pressure gas in the cylinder have a face-to-face structure, and the transfer agent has a donut shape. Therefore, the flame from the ignition means directly hits the rupture disk. Thereby, the rupture disk can be ruptured almost simultaneously with the ignition of the ignition means.

Further, a gas retaining space is formed between the cylinder and the housing. The cold gas discharged from the cylinder and adiabatically expanded mixes with the high-temperature heat flow discharged from the housing in this gas retaining space. As a result, the gas is discharged as a uniformly heated gas.

'The gas generator according to claim 2 is the gas generator according to claim 1, wherein the housing has a flame discharge port formed at a bottom portion, and the flame discharge port is shrunk from inside to outside. It is formed so as to be centered on the center of the rupture disk.

Since the diameter of the flame outlet is reduced from the inside to the outside, the flame from the igniting means is concentrated on the center of the rupture disk. Therefore, the flame from the ignition means is not dispersed, and the rupture disc ruptures reliably. In addition, the rupture disk bursts and opens at the center, so the gas in the cylinder is reliably released.

The gas generator according to claim 3 is the gas generator according to claim 2, wherein a plurality of flame discharge holes toward the outer cylinder are formed in a bottom-side cylinder of the housing. is there.

Since a plurality of flame discharge holes are formed in the side cylinder portion of the housing, The flame or hot gas is discharged from the flame discharge hole into the gas retaining space. Then, the gas in the gas retaining space can be stirred. For this reason, the cold gas released from the cylinder is heated by the heat flow from the housing and is released from the gas discharge holes provided in the outer cylinder.

The gas generator according to claim 4 is the gas generator according to claim 1, wherein the gas from the cylinder is agitated in the gas retaining space at the bottom of the housing, and is provided in the outer cylinder. A plurality of legs are provided so as to be released from the plurality of gas discharge holes.

The gas generator according to claim 5 is the gas generator according to claim 2, wherein the gas from the cylinder is agitated in the gas retaining space at the bottom of the housing, and the gas is supplied to the outer cylindrical member. A plurality of legs are provided so as to be released from a plurality of provided gas discharge holes. The leg provided on the housing is formed, for example, at the same predetermined angle as a gas discharge hole provided at a predetermined angle around the outer cylinder. In other words, the gas is released from between the legs to the portion of the outer cylinder where the gas discharge holes are not formed. This makes it easier for the gas released from the cylinder to stay in the gas storage space, and is heated by the heat flow from the housing side and released from the gas discharge holes.

The gas generator according to claim 6 is the gas generator according to claim 1, wherein the rupture disk is broken by a flame force from the ignition means.

Since the rupture disk is broken only by the flame power of the flame from the ignition means, the size of the gas generator can be reduced.

The gas generator according to claim 7, wherein the calorific value due to the combustion of the transfer charge is 400 J / g or more. It is.

The calorific value due to combustion of the transfer charge is usually at least 400 jZg, preferably at least 550jZg. As a result, the gas released from the cylinder and having a low temperature due to adiabatic expansion can be heated to a high temperature gas. Also, since the amount of transfer charge can be reduced, the size of the gas generator can be reduced. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram showing a cross section of an embodiment of a gas generator according to the present invention. FIG. 2 (a) is a diagram showing a cross section of a housing used for the gas generator according to the present invention, and FIG. 2 (b) is a diagram of the housing viewed from the bottom. FIG. 3 is a schematic sectional view of the ignition means used in the gas generator according to the present invention, and a diagram showing an end face thereof. FIG. 4 is a diagram showing a cross section of another embodiment of the gas generator according to the present invention. FIG. 5 is a view showing a cross section of another embodiment of the gas generator according to the present invention. FIG. 6 is a sectional view taken along the line AA in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

A gas generator according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic sectional view of an example of an embodiment of the gas generator according to the present invention. In FIG. 1, a gas generator P 1 is composed of a cylinder 1 containing high-pressure gas, a cup-shaped housing 4 containing explosive 2 and ignition means 3, a cylinder 1 and a housing 4. And an outer cylindrical member 5 for connecting and holding the outer cylinder.

Cylinder 1 is made of metal such as stainless steel, aluminum or iron, It has a cylindrical shape with a bottom, and the opening side is reduced in diameter in two stages. In the cylinder 1, argon or helium gas or the like is sufficient to inflate and operate the airbag, etc. (for example, 0.3 to 0.7 mol for the side and 0.8 for the air curtain). ~ 1.2 moles). The cylinder is maintained at an internal pressure of usually 2 OMPa or more, preferably 25 MPa or more, and has an opening at one end sealed with a cylinder cap 23 having a rupture disk 6.

The rupture disk 6 is in contact with a leg 10 protruding from the bottom of the housing 4 and is pressed in a direction to close the cylinder 1. The thickness of the rupture disk 6 is not particularly limited as long as it can be broken by the ignition means 3. The preferred thickness of the rupture disk 6 is preferably 0.05 to 0.5 mm, and more preferably 0.1 to 0.3 mm.

As shown in FIG. 2 (a), the housing 4 is formed in a cup shape, and is formed by projecting from the bottom portion 7 and the body portion 9 including the side cylindrical portion 8 at equal intervals in the circumferential direction. It consists of three legs 10 (see Fig. 2 (b)). The bottom portion 7 is formed to be thicker than the side cylindrical portion 8 and has a stepped portion 11 formed on an outer peripheral portion thereof. Further, a flame discharge port 13 that opens from the inside of the combustion chamber 12 to the outside is formed. The diameter of the flame outlet 13 is reduced from the combustion chamber 12 to the outside. As a result, the flame power is increased, and the emitted flame can be concentrated on the center of the rupture disk 6. Further, a metal seal tape made of aluminum, stainless steel, iron, or the like is affixed to the bottom 7 side of the flame discharge port 13. This seal tape prevents moisture and the like from entering the combustion chamber 12 and prevents the transfer charge 2 stored in the combustion chamber 12 from becoming wet. The thickness of the sealing tape is preferably 100 μπι or less. That is, it is instantaneously broken by the flame caused by the ignition of the ignition means 3 and does not hinder the progress of the flame.

As shown in FIG. 1, inside the housing 4, a doughnut-shaped (hollow cylindrical) explosive charge 2, a first cushion material 14, a second cushion material 15, and an ignition means 3 are provided. The crimped holders 20 are loaded in this order. These are fixed such that the open end 21 of the housing 4 is bent inward to press the holder 20. The center space in the housing 4 formed by the donut-shaped transfer charge 2 and the cushion materials 14 and 15 forms a combustion chamber 12. The first and second cushion members 14 and 15 are made of ceramic fiber, silicon foam, or the like, and are formed in a donut shape like the transfer charge 2. These cushioning materials 14 and 15 absorb the vibration transmitted to the explosive 2 so that the explosive 2 is not crushed by vibration or the like. The donut-shaped transfer charge may be formed by laminating one or more donut-shaped transfer charges, and a smaller-diameter granular transfer charge may be arranged in a donut shape via a support member. The ignition means 3 is arranged coaxially with the housing 4 and has a structure facing the flame discharge port 13 formed at the bottom 7. For this reason, the flame from the ignition means 3 is released from the flame discharge port 13 without being blocked by an obstacle in the combustion chamber 12. The igniting means 3 is made of, for example, an embolus made of resin such as polybutylene terephthalate, polyethylene terephthalate, nylon 6, nylon 66, polyphenylene phenol, polyphenylene oxide and glass fiber. 28 is caulked and fixed to a metal holder 20.

Further, as shown in FIG. 3, the ignition means 3 includes a glass tube 29b into which the ignition agent 27 is loaded and a glass tube covering the glass tube 29b. A tube 29a made of metal such as stainless steel, aluminum or iron, an plug 28 into which the tubes 29a and 29b are fitted, an electrode pin 22 protruding from the plug 28, and a glass body insulating between the electrode pins 22 26 and a bridge line 25 connecting both electrodes 22 in the tube '29b. For example, a cross-shaped notch or the like is formed on the end face 24 of the tubular body 29a so that the flame is easily ruptured when the flame is emitted, and the flame is emitted from the central portion of the end face 24.

Further, it is preferable that the igniting means 3 has an internal pressure rising force of 3 Msec or more and 4.7 MPa or more when ignited in a 10 cc tank. As a result, the rupture disk 6 can be broken by the flame force.

The wearing explosives 2 7 loaded in the ignition means 3 in order to generate such flame power, for example, zirconium (Z r), tungsten (W), the Kariumu perchlorate (KC 10 ₄₎ to the component It is preferable to use a binder that uses fluororubber or netrocellulose as the binder. Also, zirconium, tungsten, the composition ratio of the perchlorate potassium (weight ratio), is determined so as to be sufficiently fire at heating of the bridge wire 25, Z r: W: KC 10 4 = 3: 3, 04.0: 3.04.0 is preferable, and Z: W: KC1〇43: 3.5: 3.5 is more preferable. In addition, the igniting agent 27 increases the contact (contact area) with the bridge wire 25 so that the bridge wire 25 is not cut off when the tube 29 and the plug 28 are fitted (when the ignition means 3 is assembled). It is preferably in the form of powder or granules. Further, the loading amount of the igniting agent 27 can be appropriately set, and it is preferable that the igniting agent 27 is loaded more than usual in order to increase the flame power to be ejected. Also, the composition ratio of each component can be adjusted so that a high flame power can be obtained. The two electrode pins 22 projecting from the embolus 28 are arranged in parallel with the axis of the embolus 28, and penetrate through the embolus 28. Each electrode pin 22 has a shape that curves outward at the flange of the plug 28 and protrudes from both ends of the plug 28. Each of these electrode pins 22 is formed of a single conductive round bar (stainless steel, iron-nickel alloy, etc.). In each of the electrode pins 22, an electric wire 25 is welded by welding or the like to the protruding portion located in the tubular body 29 b as shown in FIG.

The bridge line 25 is laid between the electrode pins 22 in a relaxed prone state (a state in which no tension is applied). Thus, the bridge wire 25 generates heat by energizing each of the electrode pins 22. In the case of Denbashi Line 25, the resistance value per unit length [Ω / mmJ] is determined so that the calorific value can ignite the ignition agent 27. The resistance value [Ω / πιπ] is determined by the relationship between the shape (thickness) of the bridge wire 25 and the current value [Α] conducted to each electrode 22. The resistance value [Ω / mm] is determined so that the tube 29 and the embolus 28 can be fitted so that the bridge 25 is not cut off. '-The electric bridge wire 25 is made of, for example, a nickel chrome wire excellent in heat generation and strength.

For example, boron, 5-aminotetrazole or potassium nitrate, nitric acid, so that the calorific value of combustion of the transfer charge 2 is usually at least 400 jZg, preferably at least 500 JZg. Sodium or nitrate such as sodium nitrate can be used. With such a composition, the calorific value due to combustion can be generally at least 400 jZg, preferably at least 500 j / g. Here, in the case of a transfer charge with a calorific value of less than 400 JZ g due to combustion, when the rupture disk 6 that seals the cylinder 1 ruptures and the released gas cools down due to adiabatic expansion. It becomes difficult to sufficiently heat. For this reason, It becomes necessary to increase the amount of the transfer charge 2, and the gas generator P1 cannot be reduced in size.

As shown in FIG. 1, the outer cylindrical member 5 is formed in a cylindrical shape from a metal material such as stainless steel, aluminum, or iron, and the housing 4 is fitted to one end side, and a step formed in the housing 4. It is swaged and fixed to part 11. The other end of the outer cylinder member 5 is inscribed and fitted to the reduced-diameter first-step portion 9 of the cylinder 1 and is fixed by welding or the like. At this time, the outer cylindrical member 5 is brought into contact with the cylinder 1 and the housing 4 with the rupture disk 6 provided at the open end of the cylinder 1 and the leg 10 of the housing 4 in contact with each other, as shown in FIG. Fixed. The rupture disk 6 and the leg 10 of the housing 4 are in contact with each other to form a gas retaining space 16. A filter material 18 is arranged on an outer peripheral portion of the gas retaining space 16, that is, on an inner peripheral portion of the outer cylindrical member 5. The filter material 18 is formed into a cylindrical shape that is substantially the same as the inner diameter of the outer tubular member 5 by using, for example, a knitted wire mesh, a plain-woven wire mesh, or an aggregate of crimp-woven metal wires. Gas release holes 17 are formed at predetermined intervals around the outer cylindrical member 5 where the filter member 18 contacts.

As described above, since the cylinder 1 and the housing 4 are fitted and fixed by the outer cylindrical member 5 formed of the same cylinder, they are connected and held coaxially with their respective axes aligned. As a result, the ignition means 3, the flame discharge port 13 and the center of the rupture disc 6 become coaxial, and the flame from the ignition means 3 intensively hits the center of the rupture disc 6. The operation of the gas generator P1 will be described with reference to FIG. It is assumed that the gas generator P1 shown in FIG. 1 is directly or indirectly connected to the airbag device on the shaft end side of the housing 4. When the collision sensor detects the collision of the automobile, the gas generator P1 energizes and ignites the ignition means 3, as shown in FIG. The flame of the ignition means 3 ruptures along, for example, a cross-shaped notch provided on the end face 24, and is ejected into the combustion chamber 12 from the center of the end face 24 of the ignition means 3. . The flame that has passed through the combustion chamber 12 has its flame power increased by the throttle of the flame outlet 13, instantaneously breaking the metal sealing tape provided at the outlet of the flame outlet 13, and the rupture disc 6. The rupture disc 6 bursts at a stretch. The gas released from the rupture disk 6 flows out into the gas retaining space 16. At this time, the released gas undergoes adiabatic expansion in the gas retaining space 16, so that the temperature rapidly decreases.

On the other hand, the flame from the ignition means 3 causes the transfer charge 2 in the combustion chamber 12 to burn. The high-temperature heat flow generated thereby flows into the gas retaining space 16 and mixes with the cooled gas released from the cylinder 1. The gas discharged from cylinder 1 is heated by this, and becomes one high-temperature gas.

After passing through the filter material 18, the gas is discharged from the gas discharge holes 17 formed in the outer cylinder 5. Thus, the airbag connected to the gas generator P1 is instantaneously inflated by the clean gas discharged from each gas discharge hole 17. At this time, the legs 10 of the housing 4 are evenly arranged in the space 16. And since it is formed in the projection part of the gas discharge hole 17, it serves as a baffle when the gas retention space 16 is discharged from the gas discharge hole 17, and serves to diffuse gas, and It accelerates the mixing of one gas with the hot heat flow from combustion chamber 12. As described above, according to the gas generator P 1 of the present invention, the calorific value due to the combustion of the transfer charge 2 is usually not less than 400 j / g, preferably not more than 550 j Z g, Reduces the amount of charge 2 and reduces the size of combustion chamber 1 and 2 Can be This makes it possible to shorten the distance between the rupture disk 6 and the ignition means 3, and by making the rupture disk 6 and the ignition means 3 face-to-face, the flame of the ignition means 3 can be directly transferred to the Can be applied to disk 6. For this reason, the capacity of the combustion chamber is smaller than in the conventional case where the rupture disk is destroyed by increasing the pressure in the combustion chamber with the gas generated by burning the transfer charge stored in the combustion chamber. Can be reduced in size.

In addition, the flame outlet 13 is formed in the bottom 7 of the housing 4 so that the flame generated by the ignition means 3 strikes the center of the rupture disk 6 in a concentrated manner. Even if a mechanically high strength rupture disk 6 is used, it can be ruptured by a flame without using mechanical means such as tons. Therefore, the structure of the gas generator P1 can be simplified.

It should be noted that the gas generator P1 of the present invention can be used not only for airbags but also for vehicle occupant restraint devices such as seatbelt pretensioners and vehicle battery power in the event of an accident that triggers a safety system. It can also be used as a separation safety switch for separating the net.

FIG. 4 is a schematic cross-sectional view of another embodiment of the gas generator according to the present invention. In FIG. 4, the same members as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description is omitted.

In the gas generator P2 shown in FIG. 4, a plurality of flame discharge holes 30 facing the outer cylinder 5 are formed in the side cylinder 8 of the housing 4. A gas discharge hole 17 is formed in the outer cylinder member 5 on the igniter 3 side. Therefore, the high-temperature heat flow generated by the ignition of the igniter 3 is released from the flame discharge port 13 and the flame discharge hole 30 into the gas retaining space 16 空間. As a result, immediately after the ignition of the igniter 3, the flame from the flame outlet 13 causes the cylinder to fire. The low-temperature gas released from the cylinder 1 and then adiabatically expanded in the gas retaining space 16 is cooled in the gas retaining space 16 by rupture of the rupture disk 6 of the cylinder cap 2 3 It can be heated by a high-temperature heat flow from the flame outlet 13 and the flame outlet 30. In addition, since the flame discharge holes 30 are formed toward the outer cylinder 5, the released heat flow first hits the inner walls of the filter material 18 and the outer cylinder 5, and the gas in the gas retention space 16 Is stirred. Therefore, the gas in the gas retaining space 16 can be reliably heated and released from the gas release holes 17.

FIG. 5 is a schematic cross-sectional view of another embodiment of the gas generator according to the present invention. In FIG. 5 (11), the same members as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description is omitted.

The gas generator P3 shown in FIG. 5 is formed so as to come into contact with the leg 10 force cylinder cap 23 formed on the housing 4. After the gas released from the cylinder 1 stays in the gas retaining space 16, it is ejected from the opening where the legs 101 ¾T are formed toward the outer cylinder 5, and the gas discharging hole is formed. It is to be released from 17.

As shown in the lower half of the cross-sectional view taken along the line III-III of FIG. 5 shown in FIG. 6, the leg 1 ◦ is formed with a gas discharge hole 1 It is formed at substantially the same position as 7. That is, it is provided from the bottom 7 of the housing 4 so that the opening 30 between the legs 10, 10 can be located in a portion of the outer cylinder 5 where the gas discharge hole 17 is not formed. Thereby, the gas from the cylinder 1 is discharged toward the outer cylinder 5 from the opening 30 formed between the legs 10. Since the gas discharge hole 17 is located closer to the igniter 3 than the opening 30, the gas from the cylinder is not immediately discharged from the gas discharge hole 17, but is discharged in the gas retaining space 16. It stays and is released after being stirred. As described above, the gas released from the cylinder 1 by the legs 10 is reliably retained in the gas retaining space 16 and then released from the gas releasing holes 17. Therefore, the gas from the cylinder 1 is reliably heated by the high-temperature heat flow from the housing 4 in the gas retaining space 16. Industrial applicability

As described above, the gas generator of the present invention breaks the rupture disk having high sealing strength and high breaking strength of the cylinder loaded with the high-pressure gas by the flame from the ignition means. Then, the high-pressure gas discharged from the cylinder and the high-temperature heat flow generated in the combustion chamber are mixed and discharged as a high-temperature, high-pressure gas. For this reason, it is not necessary to increase the amount of transfer charge or use mechanical means to destroy the rupture distor, so that the structure can be simplified and the miniaturization method can be realized. It can be a gas generator.

"Five

Claims

The scope of the claims

1. A cylinder loaded with high-pressure gas, a cup-shaped housing containing a donut-shaped transfer charge and ignition means, a rupture disk for holding and sealing the pressure of the cylinder, the cylinder and the cylinder C

An outer cylinder member for connecting and holding the cylinder and the housing so as to form a gas retention space between the housing and the housing.

A gas generator characterized in that the cylinder and the housing are connected and held so that the ignition means housed in the housing faces the ignition means. ■

10 2. The housing has a flame outlet at the bottom, the flame outlet is reduced in diameter from the inside to the outside, and the flame from the igniting means is centered on the rupture disk. 2. The gas generator according to claim 1, wherein the gas generator is formed so as to be concentrated.

3. The gas generator according to claim 2, wherein a plurality of flame discharge holes toward the outer cylinder material are formed in a bottom-side cylinder portion of the housing.

4. A plurality of legs are provided at the bottom of the housing so that the gas from the cylinder is stirred in the gas storage space and discharged from the plurality of gas discharge holes provided in the outer cylinder. The gas generator according to claim 1, which is provided.

20 5. A plurality of legs are provided at the bottom of the housing so that the gas from the cylinder is stirred in the gas retaining space and discharged from the plurality of gas discharge holes provided in the outer cylinder. The gas generator according to claim 2, which is provided.

6. The gas generator according to claim 1, wherein the rupture disk is broken by a flame force from the ignition means.

7. The calorific value due to combustion of the transfer charge is more than 400 Jg The gas generator according to claim 1.