JP2002193068A - Gas generator for air bag and air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas generator for an air bag having a simple structure capable of surely protecting an occupant by rapidly increasing gas pressure after operating the gas generator imparting a shock to the occupant as little as possible in the initial stage of operation. SOLUTION: In this gas generator for the air bag where an inner cylinder member is arranged in a housing, an ignition means housing chamber and a combustion chamber are partitioned, and plural inflammation holes capable of communicating both chambers are formed in a peripheral surface of the inner cylinder member, the plural inflammation holes are formed in a range where a distance from an end part of the innder cylinder member becomes less than 30% of the shaft directional length of the inner cylinder member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag gas generator for protecting an occupant from an impact, and more particularly to an airbag gas generator characterized in its operation performance and an airbag device.

[0002]

2. Description of the Related Art When a vehicle such as an automobile collides at a high speed, an inertia is used to prevent a passenger from smashing into a hard part inside the vehicle, such as a steering wheel or a front glass, to prevent injury or death. Quickly inflates the bag with gas,
An airbag system is installed to prevent passengers from hitting dangerous places.

[0003] Such an airbag system can be used even if the occupant's physique (for example, a person with a high or low sitting height, an adult or a child, etc.), or his / her riding posture (for example, a posture holding on to a steering wheel) is different. It is desirable that the occupant can be restrained safely. Therefore, conventionally, an airbag system has been proposed which operates in the early stage of operation with as little impact as possible on the occupant.

[0004] In Japanese Patent Application Laid-Open No. Hei 8-207696, gas is generated in two stages, the bag is inflated relatively slowly in the first stage, and gas is rapidly generated in the second stage.
The use of capsules of different types of gas generating agents has been proposed, but has the drawback that the structure inside the gas generator is complicated, the size of the container becomes large, and this increases the cost.

Also, in US Pat. Nos. 4,998,751 and 4,950,458, two combustion chambers are provided to regulate the operation function of the gas generator, and the gas generating agent is burned in two stages. It has been proposed, but its structure is complicated and not yet sufficient.

[0006]

SUMMARY OF THE INVENTION The present invention, while having a simple structure, operates in the initial stage of operation with as little impact on the occupant as possible and in a subsequent operation stage. The present invention provides a gas generator for an airbag that can surely protect an occupant.For example, in a gas generator for a driver's seat, the inflation speed of the airbag during 10 milliseconds from the start of operation of the gas generator is conventionally reduced. The present invention provides a gas generator for an airbag which is more gradual than that of the first embodiment and exhibits an operation performance of sufficiently restraining an occupant after 30 to 50 milliseconds. Further, an airbag device using the gas generator is provided.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to dispose a substantially cylindrical inner cylinder member in a housing having a gas discharge port, and provide an ignition means housing chamber inside the inner cylinder member, A gas generator for an airbag having a combustion chamber formed therein, wherein a plurality of heat transfer holes are formed on a peripheral surface of the inner cylindrical member so that the ignition means housing chamber and the combustion chamber can communicate with each other; The plurality of fire holes are formed so that the distance from the end of the inner cylinder member is less than 30% of the axial length of the inner cylinder member. Is done. And the distance from the end of the inner cylinder member is,
It is desirable that it is formed within 25% of the axial length of the inner cylinder member.

[0008] The inner cylinder member is arranged inside the housing, and defines the formation of an ignition means accommodating chamber on the inside and a combustion chamber on the outside. Therefore, it is necessary to provide at least an ignition means accommodating chamber inside the inner cylinder member, but there is another chamber, for example, a combustion chamber existing separately from the outer side of the inner cylinder member (that is, the second combustion chamber). ) May be provided.
The ignition means accommodating chamber is a chamber for accommodating the ignition means for starting the operation of the gas generator, and the combustion chamber is a chamber for accommodating the gas generating means to be ignited and burned by the activated ignition means. The blast hole is a through hole for causing the flame of the igniting means for igniting the gas generating means to blow out to the combustion chamber. In addition, as long as the inner cylindrical member has at least a cylindrical peripheral wall surface, the inner cylindrical member includes a member provided with a flange at an end opening.

In the present invention, an igniter to which an ignition current for activation is applied is accommodated at one end side of the inner cylinder member disposed in the housing, and the plurality of ignition holes are formed by: It can be formed closer to the other end on the side where the igniter is arranged than the center in the axial direction of the inner cylinder member.

Further, in the gas generator according to the present invention, a substantially cylindrical inner cylinder member is disposed in a housing having a gas discharge port, and an ignition means accommodating chamber for accommodating an ignition means inside the inner cylinder member. A combustion chamber for containing the gas generating agent is formed on the outside, and a plurality of communicating portions for allowing communication between the ignition means housing chamber and the combustion chamber are formed on the peripheral surface of the inner cylindrical member in a circumferential direction. The plurality of communicating portions may have a central angle between adjacent communicating portions greater than 60 °.

The above gas generator usually generates a flame when the ignition means arranged in the ignition means accommodating chamber operates,
This flame is formed as being ejected into the combustion chamber from a plurality of heat transfer holes formed on the peripheral surface of the inner cylinder member.

In order to solve the above-mentioned problems, the present invention provides a gas generator for an air bag in which the ejection angle of the flame ejected from the blast hole is adjusted.

That is, a substantially cylindrical inner cylinder member is disposed in a housing having a gas discharge port, and an ignition means accommodating chamber for accommodating an ignition means inside the inner cylinder member and a gas generating agent outside the chamber. An airbag gas generator having a combustion chamber formed therein, wherein a plurality of heat transfer holes for ejecting a flame generated by the operation of an ignition means to the combustion chamber are formed on a peripheral surface of the inner cylinder member. The fire hole is a gas generator for an air bag, wherein the flame is jetted into the combustion chamber at an elevation angle and a depression angle of 45 °.

According to the gas generator of the present invention, in the early stage of operation, the occupant is operated with as little impact as possible, and the occupant can be reliably protected in the subsequent operation stage. It can be a gas generator for an airbag.

[0015] Specifically, the operating performance of the gas generator depends on the desired tank maximum pressure in the tank combustion test by P (kPa),
When the time from the start of the rise of the tank pressure to the arrival of the tank maximum pressure P (kPa) is T milliseconds, the tank pressure after 0.25 × T milliseconds can be 0.25 × P (kPa) or less.
This operating performance further increases the tank pressure after 0.80 x T milliseconds.
It is desirable that the pressure is adjusted so as to be 0.70 × P (kPa) or more.

Further, in the gas generator according to the present invention, the peak of the internal pressure of the housing during the operation of the gas generator is:
It is desirable that the current appears 10 to 20 milliseconds after the application of the ignition current. That is, it is desirable to reach the maximum housing internal pressure 10 to 20 milliseconds after the application of the ignition current.

In the gas generator of the present invention, 10 to 20 after the application of the ignition current at which the maximum combustion internal pressure in the housing reaches a peak.
Until the millisecond, while gradually discharging the combustion gas of the gas generating agent from the gas outlet to increase the pressure of the gas generator,
The pressure in the tank is gradually increased. After the pressure in the housing of the gas generator reaches a peak, a sufficient amount of gas for restraining an occupant is rapidly discharged from the gas discharge port, and the pressure in the gas generator is reduced and the tank is discharged. The pressure inside is increased at a stretch. As described above, such a gas generator has a desired tank maximum pressure in the tank combustion test as P (kPa), and a time from the start of the rise of the tank pressure to reaching the tank maximum pressure P (kPa) as T milliseconds. Then, a gas generator for an airbag whose operation performance is adjusted such that the tank pressure after 0.25 × T milliseconds becomes 0.25 × P (kPa) or less is realized. In the gas generator of the present invention exhibiting such an operation performance, the output in the early stage of operation is suppressed, so that the airbag (bag) accommodated in the module is rapidly inflated in the initial stage. Without exerting an excessive impact on the occupant, it is possible to suppress the impact. On the other hand, the tank pressure after 0.25 × T milliseconds above was 0.25 × P (kP
a) If above, the operating conditions (for example, the outside air temperature)
Depending on the case, the momentum when the bag breaks out of the module and comes out may be too strong, and in some cases, it may be difficult to obtain the effects intended by the present invention.

In the present invention, the tank combustion test is a test performed by the following method. <Tank combustion test> A gas generator for an air bag is fixed in a 60-liter SUS (stainless steel) tank, the tank is sealed at room temperature, and then connected to an external ignition electric circuit. The pressure rise change in the tank is measured for a time of 0 to 200 milliseconds by setting a time when the ignition electric circuit switch is turned on (ignition current application) to 0 by a pressure transducer installed separately in the tank. Each measurement data is finally processed as a tank pressure / time curve by computer processing.
A curve for evaluating the performance of the molded article of the gas generating agent (hereinafter referred to as “tank curve”) is obtained. After the completion of the combustion, a part of the gas in the tank can be extracted and used for gas analysis of CO and NOx.

Similarly, with respect to the pressure inside the housing, a change in pressure rise is measured for a time period of 0 to 200 milliseconds, with the ignition current application time set to zero.

The maximum pressure of the tank in the present invention is the maximum pressure in the SUS tank in this tank combustion test, and the maximum internal pressure of the combustion means the inside of the housing when the gas generator is operated. (That is, the maximum housing internal pressure).

In the gas generator for an air bag according to the present invention, the heat transfer hole formed in the inner cylinder member that partitions at least the inside of the housing into the combustion chamber and the ignition means accommodating chamber is located more than the center of the inner cylinder member. , It is necessary to be formed near one of the ends, but other components such as the composition and shape of the gas generating means, and the working gas generated by combustion of the gas generating means are cooled and / or purified. The presence or absence of a coolant and a filter for performing the operation, the overall shape of the housing, and the like can be appropriately adjusted according to the operation performance. For example, with respect to gas generating means for generating a working gas by burning, in addition to an azide-based gas generating agent based on an inorganic azide, for example, sodium azide (sodium azide), a non-inorganic azide-based non-azide-based gas generating agent, Azide-based gas generating agents and the like can also be used. Further, the size and number of gas outlets formed in the housing, the size and overall shape of the housing, and the like can be appropriately adjusted according to the operation performance, the accommodation space, and the like.

The above-described gas generator for an airbag is housed in a module case together with an airbag (bag body) that introduces and inflates the gas generated by the gas generator to form an airbag device. In this airbag device, the gas generator operates in conjunction with the detection of the impact by the impact sensor, and discharges the working gas from the gas outlet of the housing. This working gas flows into the airbag, which breaks the module cover and bulges, forming a shock absorbing cushion between the rigid structure in the vehicle and the occupant.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a gas generator housing for an air bag according to the present invention.
A gas generator for an air bag using the same will be described.

FIG. 1 is a schematic longitudinal sectional view showing an embodiment of the gas generator for an air bag according to the present invention.

The gas generator shown in FIG.
An ignition means composed of an electric igniter 6 and a transfer charge 7 and a gas generating means for generating a working gas for inflating an airbag by actuation of the ignition means in a housing 3 having The working gas generated by the combustion of the gas generating agent 8 is cooled between the combustion chamber 9 in which the gas generating agent 8) is contained and the peripheral wall of the housing 3 in which the gas generating agent 8 is stored. Coolant / filter means (ie, coolant 5) is provided. At the end of the coolant 5 on the diffuser shell 1 side, a tubular portion 1 is provided.
9 are arranged.

The housing 3 is formed by a diffuser shell 1 having a cylindrical shape with a lid and a closure shell 2 having a cylindrical shape with a bottom. Both shells have outward flange portions 53, 58 formed at respective openings. It is integrated by welding. Of these, the peripheral wall of the closure shell is a flange
The 53 side is formed to extend radially outward.

A cylindrical inner cylinder member 4 having a flange portion 24 joined to the inner surface of the ceiling of the housing is disposed inside the housing. The outside is a combustion chamber 9. Both chambers are formed so as to be able to communicate with each other by a heat transfer hole 14 formed on the peripheral surface of the inner cylinder member 4. The ignition means accommodating chamber 10 includes an igniter 6 that operates upon receiving an operation signal (i.e., an ignition current for operation), and a transfer charge 7 that ignites and burns by the operation of the igniter. In the combustion chamber 9, gas is ignited and burned by the flame of the ignition means (the flame of the transfer charge 7 in the present embodiment) to generate working gas for inflating the airbag. The generator 8 is stored.

The igniter 6 constituting the igniting means is fixed at its lower end by caulking the lower end opening of the inner cylindrical member 4, and the transfer charge 7 is disposed immediately above the igniter 6. The heat transfer hole 14 formed in the peripheral surface of the inner cylinder member 4 is formed on the side of the inner cylinder member opposite to the side on which the igniter is fixed (that is, on the side of the transfer agent 7 in the drawing). I have. In the present embodiment, the heat transfer hole 14 is 3 mm in the axial length of the inner cylindrical member 4 from the end on which the flange is formed.
It is formed in a range of less than 0%.

The gas generating agent is ignited by the flame or heat mist of the transfer charge ejected from the transfer hole 14. As described above, by adjusting the location (height) where the heat transfer hole 14 is formed, the ignition area of the gas generating agent 2 ms after the application of the ignition current can be adjusted. For example, when the axial length of the inner cylinder member is set to about 29 mm and the heat transfer hole is formed at a position 7 mm from the end face of the flange portion, the gas initially charged at 2 ms after the application of the ignition current is applied. It is possible that 50% of the total surface area of the generator will ignite.

The inner cylindrical member 4 to which the igniter 6 is fixed by caulking the end is accommodated in an opening 60 of the closure shell 2 described later, and is welded to the closure shell 2 with the igniter 6 fixed. It is integrated. Specifically, a tubular portion 61 that bends inside the housing 3 is formed integrally with the opening 60, and the tubular portion 61 and the inner tubular member 4 are welded. Since the tubular portion 61 is bent inside the housing 3, only the tubular portion 61 does not protrude outward in the axial direction of the housing 3.
The overall height of the gas generator itself can be reduced, and thus the overall height of the gas generator can be reduced. Conversely, when the gas generator thus formed is formed at the same height as the gas generator in which the cylindrical portion 61 is bent outside the housing 3, even if the gas generator has the same height and outer diameter, The internal volume of the housing can be made sufficiently large. In addition, the cylindrical portion 61
Thereby, the substantially annular under plate 22 that supports the gas generating means can be supported.

A cylindrical coolant 5 formed by using a laminated wire mesh or the like is supported by a bent portion formed at the end of each of the shells 1 and 2, and is disposed so as to be substantially paired with the inner peripheral surface of the housing. A gap 20 is formed between the outer peripheral surface of the coolant 5 and the inner peripheral surface of the housing 3 as a flow path for the working gas. The gap 20 allows the coolant 5 to function completely and effectively.

As the coolant 5, a coolant that does not bulge outward in the radial direction due to the pressure thereof when the working gas passes is preferably used. This is because if the coolant 5 swells due to the passage of the gas generating means, the gap 20 secured between the coolant 5 and the inner peripheral surface of the housing is closed, so that it cannot practically function as a gas flow path. That's why. Therefore, the coolant 5 shown in this embodiment is
Has a tensile strength in the radial direction of 12054N (1230N).
kgf).

A deflector member 18 is arranged between the end surface of the coolant 5 and the inner surface of the diffuser shell 1. This deflector member 18 is useful when a gas generating agent 8 that generates a fluid or semi-fluid combustion product by combustion is used.

That is, the combustion products generated by the combustion of the gas generating agent can be removed by attaching to the cylindrical portion 19 of the deflector member 18 or dropping it after the collision. Further, in the deflector member 18, the annular portion 16 abutting on the end face of the coolant 5 is formed to have elasticity as appropriate, so that the annular portion 16 is arranged radially outside the combustion chamber 9 as the coolant 5 in the axial direction. It is also possible to use a wire mesh coolant 5 with little expansion and contraction. Further, the deflector member 18 has a wall portion 17 that is in contact with the inner peripheral surface of the coolant 5 formed integrally with the annular portion 16. Accordingly, it is possible to prevent the so-called short path in which the coolant 5 is positioned and fixed, and the working gas is discharged without passing through the coolant.

In the gas generator formed as described above,
The igniter 6 is activated by the application of the ignition current, and the igniter 6 is ignited and burns, and the flame passes through the igniter hole 14 of the inner cylinder member 4 to receive the space for the gas generating agent 8. Released into The flame of the transfer charge 7 ignites and burns the gas generating agent 8. Even if a part of the flame directly passes through the coolant 5, the deflector member 18
Can be prevented from squirting out of the gas outlet 11 as it is. The working gas generated from the gas generating agent 8 ignited by the flame of the transfer charge 7 passes through the coolant 5 and reaches the gap 20 secured between the outer peripheral surface of the coolant 5 and the inner peripheral surface of the housing 3. . If the working gas that has passed through the coolant 5 contains fluid or semi-fluid combustion products, the gap 2
The deflector 18 collides with and adheres to the cylindrical portion 19 of the deflector member 18 disposed in the inner space 0, and is removed from the working gas.

In FIG. 1, a gas outlet 11 and a spill hole 14 are shown.
Are closed by seal tapes 15, respectively.
The gas generating agent 8 is supported by the under plate 22 and is housed in the combustion chamber. Further, the member described as the deflector member 18 in the present embodiment can also function as a mist collecting member or a flameproof plate with a similar structure. [Embodiment 2] Fig. 2 shows an embodiment of an airbag apparatus of the present invention including a gas generator using an electric ignition type ignition means.

This airbag device is composed of a gas generator 200
, An impact sensor 201, a control unit 202, a module case 203, and an airbag 204. As the gas generator 200, the gas generator described with reference to FIG. 1 is used, and its operation performance is adjusted in the initial stage of the gas generator operation so as to minimize impact on the occupant. ing.

The impact sensor 201 can be composed of, for example, a semiconductor acceleration sensor. In this semiconductor type acceleration sensor, four semiconductor strain gauges are formed on a beam of a silicon substrate which is deflected when acceleration is applied,
These semiconductor strain gauges are bridge-connected.
When acceleration is applied, the beam deflects, causing strain on the surface. Due to this strain, the resistance of the semiconductor strain gauge changes, and the change in resistance is detected as a voltage signal proportional to the acceleration.

The control unit 202 has an ignition determination circuit, and a signal from the semiconductor acceleration sensor is input to the ignition determination circuit. When the shock signal from the sensor 201 exceeds a certain value, the control unit 202 starts the calculation, and when the calculation result exceeds a certain value, the ignition unit 6 of the gas generator 200 sends an activation signal (that is, an activation signal). (Ignition current).

The module case 203 is made of, for example, polyurethane and includes a module cover 205. The module case 203 houses the airbag 204 and the gas generator 200 and is configured as a pad module. When the pad module is mounted on the driver's seat side of an automobile, the pad module is usually mounted on the steering wheel 207.

The airbag 204 is made of nylon (for example, nylon 66) or polyester, and its bag opening 206 surrounds the gas outlet of the gas generator and is fixed to the gas generator flange in a folded state. Have been.

When an impact is detected by the semiconductor acceleration sensor 201 at the time of a vehicle collision, the signal is sent to the control unit 202, and when the impact signal from the sensor exceeds a certain value, the control unit 202 starts calculation.
When the calculated result exceeds a certain value, an operation signal is output to the igniter 6 of the gas generator 200. Thereby, the igniter 4 operates to ignite the gas generating agent, and the gas generating agent burns to generate gas. This gas is blown into the airbag 204, whereby the airbag breaks the module cover 205 and bulges, forming a cushion between the steering wheel 207 and the occupant to absorb impact.

[0043]

EXAMPLE A tank test was conducted using a gas generator having the structure shown in FIG. This gas generator has an axial length of 29m
m of the inner cylindrical member, and the inner cylindrical member has a heat transfer hole 14 formed at a position 7 mm from the end face of the flange portion. The number of the heat transfer holes is 3.2 mm, and four holes are formed at 90 ° intervals in the circumferential direction. FIG. 3 shows the tank curve.

As is clear from FIG. 3, when a tank combustion test was performed using the gas generator of the present invention,
When the tank maximum pressure is P (kPa) and the time from the start of the tank pressure rise to the tank maximum pressure P (kPa) is T milliseconds, the tank pressure after 0.25 x T milliseconds is 0.25 x P (kPa)
The tank pressure after 0.80 × T milliseconds is 0.70 ×
A gas generator having a pressure of P (kPa) or more can be provided.

[0045]

The gas generator for an air bag according to the present invention operates by applying as little impact as possible to the occupant in the initial stage of operation, and then rapidly inflates the air bag. Provided is a gas generator for an airbag having a simple structure capable of reliably protecting an occupant.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a preferred embodiment of the gas generator of the present invention.

FIG. 2 is a schematic diagram showing an airbag device of the present invention.

FIG. 3 is a tank curve of a tank test shown in an example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 diffuser shell 2 closure shell 3 housing 4 igniter 5 transfer charge 6 gas generating agent 7 coolant / filter

Claims (14)

[Claims] 1. A gas generating device for an airbag, comprising: a housing having a gas discharge port, a substantially cylindrical inner cylinder member disposed therein, an ignition means housing chamber formed inside the inner cylinder member, and a combustion chamber formed outside the inner cylinder member. A plurality of heat transfer holes that allow the ignition means housing chamber and the combustion chamber to communicate with each other on the peripheral surface of the inner cylinder member; A gas generator for an airbag, wherein a distance from an end of the member is less than 30% of an axial length of the inner cylindrical member. 2. A method according to claim 1, wherein the plurality of heat transfer holes are formed such that a distance from an end of the inner cylinder member is within 25% of an axial length of the inner cylinder member. Gas generator for airbags. 3. An igniter which is actuated by application of an ignition current for actuation is accommodated at one axial end of the inner cylinder member, and the plurality of fire holes are provided on the shaft of the inner cylinder member. The gas generator for an airbag according to claim 1, wherein the gas generator is formed closer to the other axial end than the center in the direction. 4. A plurality of communicating portions formed of one or more heat transfer holes are formed in a circumferential direction on a peripheral surface of the inner cylindrical member, and the plurality of communicating portions are adjacent to each other. The central angle between the parts is 60
The gas generator for an airbag according to any one of claims 1 to 3, which is larger than °. 5. An ignition means accommodating chamber for accommodating an ignition means inside a substantially cylindrical inner cylinder member in a housing having a gas outlet, and accommodating a gas generating agent outside the inner cylinder member. A gas generator for an airbag having a combustion chamber formed therein, wherein a plurality of communication portions that allow communication between the ignition means housing chamber and the combustion chamber are formed in a circumferential direction on a peripheral surface of the inner cylinder member. The plurality of communicating portions have a center angle between adjacent communicating portions of 60.
A gas generator for airbags, characterized by being greater than °. 6. The gas generator for an airbag according to claim 5, wherein the communication portion is formed by one or more heat transfer holes penetrating the inner cylinder member in a radial direction. 7. The communication portion is formed by one heat transfer hole penetrating the inner cylindrical member in a radial direction, and the heat transfer hole is formed to have an inner diameter of 1 to 4 mm. A gas generator for an airbag as described in the above. 8. The ignition means accommodating chamber accommodates an ignition means including an igniter which is activated by application of an ignition current, and the communication section is adapted to emit a flame generated by the operation of the ignition means. It blows out to the combustion chamber, and the communication part is
The gas generator for an airbag according to any one of claims 4 to 7, wherein the flame of the transfer charge is ejected at a horizontal angle greater than 60 ° left and right about the orthogonal axis. 9. The igniting means accommodating chamber accommodates igniting means including an igniter operated by application of an ignition current, and the operation performance of the gas generator is determined by a tank combustion test. The tank pressure after 0.25 × T milliseconds is P (kPa), and the time from the start of tank pressure rise to the tank maximum pressure P (kPa) is T milliseconds.
The gas generator for an airbag according to any one of claims 1 to 8, wherein the gas generator is adjusted to be 0.25 × P (kPa) or less. 10. The igniting means accommodating chamber accommodates igniting means including an igniter operated by application of an ignition current, and the operation performance of the gas generator is determined by a tank combustion test. The tank pressure after 0.80 × T milliseconds is 0.70 × P (kPa), where T is the time from the start of tank pressure rise to tank maximum pressure P (kPa). The gas generator for an airbag according to any one of claims 1 to 9, wherein 11. The ignition means accommodating chamber accommodates ignition means including an igniter which is activated by application of an ignition current, while the combustion chamber is ignited by the operation of the ignition means. A gas generating agent that is burned to generate a combustion gas is accommodated, and the internal pressure of the housing is 10 to 2 after application of the ignition current.
The gas generator for an airbag according to any one of claims 1 to 11, which becomes maximum after 0 milliseconds. 12. The igniting means accommodating chamber accommodates igniting means including an igniter operated by application of an ignition current, and the plurality of heat transfer holes are formed by the operation of the igniting means. The gas for an airbag according to any one of claims 1 to 11, wherein the flame is ejected into the combustion chamber, and an elevation angle and a depression angle of the ejected flame are both adjusted to 45 °. Generator. 13. A substantially cylindrical inner cylinder member is disposed in a housing having a gas discharge port, and an ignition means accommodating chamber for accommodating an ignition means inside the inner cylinder member, and a gas generating agent on the outside. A gas generator for an airbag having a combustion chamber formed therein, wherein a plurality of heat transfer holes are formed on a peripheral surface of the inner cylindrical member to blow out a flame generated by the operation of the ignition means into the combustion chamber. The gas generator for an air bag, wherein the flame hole blows out the flame generated by the operation of the ignition means into the combustion chamber at an elevation angle and a depression angle of 45 °. 14. A gas generator for an airbag, an impact sensor that senses an impact to activate the gas generator, an airbag that expands by introducing gas generated by the gas generator, and the airbag. And a module case for accommodating the
An airbag device, wherein the gas generator for an airbag is the gas generator for an airbag according to any one of claims 1 to 13.