JP4633918B2 - Gas generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas generator for an airbag, and more particularly to a gas generator suitable for inflating and deploying a passenger seat airbag.
[0002]
[Prior art]
In order to protect an occupant from an impact generated at the time of a car collision, a gas generator for instantly deploying an airbag is incorporated in an airbag module mounted in an instrument panel or the like. This gas generator generates a large amount of high-temperature gas instantaneously in response to a collision detection signal from a collision sensor.
[0003]
The gas generator for inflating the passenger airbag is required to generate a larger amount of gas than the gas generator for inflating the driver airbag. Moreover, the shape is restricted by the accommodation space of the airbag apparatus including this gas generator.
[0004]
In recent years, in addition to improving the performance of the gas generator, in addition to improving the performance of the instrument panel, in addition to improving safety, it is desirable to reduce the size and weight of the gas generator. It is supposed to be.
[0005]
Gas generators that have been used in side airbag devices have hitherto been used to reduce the size and weight of gas generators. This type of gas generator is often used in which a gas generation chamber and a filter chamber are partitioned and these are coaxially formed in series.
[0006]
Further, as the airbag on the passenger seat side, the airbag is preferably inflated gradually for the safety of the passenger. However, when these conventional gas generators used in side airbag devices are used as passenger-side gas generators, the gas generating agent in the gas generating chamber burns at once, and the airbag It expands and expands at a stretch. Therefore, the gradual inflation of the airbag as required for the passenger seat airbag cannot be expected.
[0007]
Therefore, the composition of the gas generating agent is adjusted so as to gradually inflate the air bag, the amount of gas generated is adjusted, the shape of the orifice of the connecting portion between the gas generating chamber and the filter chamber is adjusted, Various methods have been proposed, such as providing a plurality of igniters that ignite the gas generating agent and igniting the gas generating agent with a time difference.
[0008]
[Problems to be solved by the invention]
However, these conventional methods are not sufficient to adjust the amount of gas released to the airbag, particularly the passenger seat airbag, and gradually inflate and deploy the airbag.
[0009]
It is an object of the present invention to provide a gas generator for an airbag that is capable of gradually inflating and deploying an airbag for a passenger seat and that is reduced in size and weight, particularly for an airbag for a passenger seat. And
[0010]
[Means for Solving the Problems]
The gas generator according to claim 1 of the present invention for solving the above-mentioned problems is a long cylindrical housing whose both ends are closed, and an ignition means attached to at least one shaft end of the housing. A heat transfer means connected to the ignition means, loaded with a heat transfer agent, and having a plurality of heat transfer holes, wherein the inside of the housing has a gas generation chamber containing the gas generation agent, and a filter material And a gas generator partitioned into a filter chamber, and the gas generation chamber is an inner cylinder member having a plurality of gas passage holes into which the generated gas of the gas generating agent flows, and a hollow space is defined. The gas generating agent is loaded on the radially outer side of the inner cylinder member, and the hollow space communicates with the filter chamber via an orifice that controls combustion of the gas generating agent, and the generated gas is After retaining in the hollow space, From the shaft end of Iruta chamber through said orifice, characterized in that to release the filter chamber.
A hollow space having a plurality of gas passage holes is defined in the gas generation chamber, and a gas generating agent is loaded around the hollow space. And combustion is sequentially started by the flame from the heat transfer means which has a plurality of heat transfer holes. For this reason, since the gas generating agent does not burn at a stretch, it is possible to gradually inflate and deploy the airbag as required for the passenger seat airbag.
The gas generated in the gas generation chamber spreads throughout the gas generation chamber, passes through a plurality of gas passage holes, flows into the hollow space, stays in the hollow space, and then from the entire shaft end of the filter chamber. It flows into the filter chamber. Further, the generated gas flows throughout the filter chamber, where it passes through the slag collection and cooling, and flows out into the gas passage chamber as a clean gas. Thus, the entire filter chamber can be effectively used to sufficiently collect and cool the generated gas slag.
Furthermore, the amount of generated gas released from the hollow space into the filter chamber can be controlled by the orifice.
[0011]
The gas generator according to claim 2 is the gas generator according to claim 1, wherein the hollow space is formed on the same axial center as the elongated cylindrical housing, and is 50% of an axial length of the gas generation chamber. It is the above length. According to this configuration, since the hollow space is formed by the inner cylinder having the same shaft center as that of the housing, the gas generating agent is uniformly loaded on the outer peripheral portion of the hollow space. Further, the hollow space has a plurality of gas passage holes, the gas generating chamber axial length of 50% or more, and preferably for a length of more than 60%, is loaded into the gas generating chamber gas The gas generated from the generating agent flows into the hollow space easily and reliably without staying in the gas generating chamber.
[0013]
A gas generator according to a third aspect is the gas generator according to the first aspect, wherein the heat transfer means includes a nozzle having a plurality of heat transfer holes extending in the hollow space and opening in a radial direction. . According to this configuration, the entire gas generating agent loaded around the hollow space can be burned efficiently. Further, the order of combustion of the gas generating agent can be controlled by adjusting the length of the nozzle portion. Thereby, the generated gas can be released at any time.
[0014]
A gas generator according to claim 4 is the gas generator according to claim 1, wherein the heat transfer means has a cylindrical shape having the same diameter as the hollow space and has a plurality of heat transfer holes opened in a radial direction. It is. According to this configuration, the inside of the inner cylinder that defines the hollow space in the housing can be partitioned, and the transfer means can be loaded on the ignition means side to serve as the transfer means. For this reason, the structure in the housing is simplified. Further, by adjusting the length of the partition portion, the amount of the transfer agent to be loaded can be adjusted, and the combustion control of the gas generating agent can be performed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A gas generator according to an embodiment of the present invention will be described with reference to FIGS. The gas generator in the embodiment of the present invention mainly inflates and deploys a passenger seat airbag, and burns the gas generating agent 12 with one ignition means 13.
[0016]
A gas generator P1 shown in FIG. 1 includes a housing 1, ignition means 13 attached to one end of the housing 1, a heat transfer means 30 connected to the ignition means 13, and the housing 1 as a gas generation chamber. 3, a partition plate 19 partitioned into a filter chamber 4, an inner cylinder 5 defining a hollow space 6 in the gas generation chamber 3, and a gas generating agent 12 loaded on the outer periphery of the hollow space 6. Prepare.
[0017]
The housing 1 includes an outer cylinder member 2 that is open at both ends, a lid plate 10 that closes one end of the outer cylinder member 2, and a lid member 14. The housing 1 has a structure in which a lid plate 10 and a lid member 14 are fitted into each opening side in the outer cylinder member 2 to form a sealed space therein. And the housing 1 is made into the elongate cylindrical shape which used the cover plate 10 and the cover member 14 as each axial end part, and closed both ends. The sealed space inside the housing 1 is divided into two chambers, a gas generation chamber 3 and a filter chamber 4, by a partition plate 19.
[0018]
The partition plate 19 has a stepped portion, and an orifice 20 is formed on the axis of the housing 1. The orifice 20 enables the gas generation chamber 3 and the filter chamber 4 to communicate with each other. The partition plate 19 is welded to the predetermined position of the outer cylinder member 2 after the outer cylinder member 2 is caulked and fixed from the outer peripheral side.
The orifice 20 is closed by a burst plate 20 a attached to the partition plate 19. The burst plate 20a is formed of a metal foil such as aluminum and plays a role of moisture prevention and internal pressure adjustment in the gas generation chamber 3.
[0019]
A plurality of gas discharge holes 11 are formed on the outer cylinder member 2 on the filter chamber 4 side to communicate the inside of the filter chamber 4 with the airbag. Each gas discharge hole 11 is formed at predetermined intervals in the axial direction and the circumferential direction of the outer cylinder member 2.
[0020]
A stepped space S <b> 1 is formed in the lid member 14. The stepped space S <b> 1 is formed with a screw on the inner diameter portion, and is screwed with a screw formed on the large diameter portion 25 of the fire transfer means 30.
[0021]
The filter material 7 is formed in a hollow cylindrical shape, for example, by an aggregate of knitted wire mesh or crimp woven metal wire. The filter material 7 is inserted into the filter chamber 4 partitioned by the partition plate 19 in the housing 1, and is located between the lid plate 10 and the partition plate 19. The filter material 7 forms an annular gas passage space 8 with the outer cylinder material 2.
[0022]
The gas generation chamber 3 includes a hollow space 6 defined by a metal inner cylinder material 5 such as aluminum, and an annular space S2 in which a gas generating agent 12 is loaded. The hollow space 6 is fitted to a stepped portion provided on the partition plate 19 at one end side of the inner cylindrical member 5 and fitted to the large diameter portion 25 of the heat transfer means 30 provided on the lid member 14. Is formed. Further, the inner cylinder member 5 is formed with a plurality of gas passage holes 21 that communicate the hollow space 6 inside the inner cylinder member 5 and the space between the outer cylinder member 2. Each gas passage hole 21 is formed at predetermined intervals in the axial direction and the circumferential direction of the inner cylinder member 5. The hollow space 6 is formed on the same axis as the gas generation chamber 3, and is formed with a length of 50% or more of the axial length of the gas generation chamber 3, or about 90% in the present embodiment. Has been. For this reason, the gas generated in the annular space S2 efficiently flows into the hollow space 6.
[0023]
As shown in FIG. 1, the heat transfer means 30 that extends into the hollow space 6 includes a pressure combustion chamber 26 and a nozzle 17 that extends in the hollow space 6 concentrically with the axial center of the housing 1. ing.
[0024]
As shown in FIG. 1, the nozzle 17 extends concentrically with the axis of the housing 1 in the hollow space 6 in the axial direction. The pressure combustion chamber 26 side of the nozzle 17 is in contact with a rupture plate 27, and can communicate with the pressure combustion chamber 26 by the rupture of the plate 27. The inner diameter of the nozzle 17 is smaller than the inner diameter of the pressure combustion chamber 26, and the extending length L of the fire transfer nozzle 4 is an arbitrary length dimension in the hollow space 6. Preferably, the length in the hollow space 6 is set to 1/3 or more. As a result, the gas generating agent 12 can be gradually burned. Further, the nozzle 17 is formed with a plurality of heat transfer holes 18. Each of the heat transfer holes 18 is arranged in the axial direction and the circumferential direction of the nozzle 17 and communicates with the hollow space 6 through the nozzle 17. Each of the heat transfer holes 18 is formed so that the pitch between the holes is reduced in the vicinity of the pressure combustion chamber 26 and the pitch between the holes is increased as the distance from the pressure combustion chamber 26 increases. Each of these heat transfer holes 18 is closed by a rupture plate 28 attached to the outer periphery of the nozzle 17. The rupturable plate 28 is formed of a metal foil such as aluminum and seals the inside of the nozzle 17 from the inside of the hollow space 6.
[0025]
As shown in FIG. 1, the gas generating agent 12 loaded in the annular space S <b> 2 of the gas generation chamber 3 generates high-temperature gas by combustion, and is loaded over the axial direction in the gas generation chamber 3 of the housing 1. Yes.
[0026]
As shown in FIG. 1, the ignition means 13 connected to the heat transfer means 30 includes, for example, only an igniter that ignites when energized (hereinafter referred to as “igniter 13”), and the inside of the pressure combustion chamber 26. To the lid member 14. The igniter 13 protrudes into the pressure combustion chamber 26, is energized and ignited based on a collision detection signal from a collision sensor, and jets a flame into the pressure combustion chamber 26.
[0027]
In the pressure combustion chamber 26, the first transfer agent 15 is loaded in the pressure combustion chamber 26 so as to cover the tip side of the igniter 13. The first transfer agent 15 contains a composition that is ignited and combusted by a flame generated by the ignition of the igniter 13, generates heat by the ignited combustion, and generates a high-temperature gas.
As the first transfer agent 15, 5-aminotetrazole, boron fine powder, three powders such that the calorific value by combustion is 3500 J / g or more and the number of moles of gas generated by combustion is 0.5 mol / 100 g or more. It is preferable to use a mixture of molybdenum oxide and potassium nitrate in predetermined amounts.
[0028]
In addition, as shown in FIG. 1, the second transfer agent 16 is loaded over the axial direction in the nozzle 17. The second transfer agent 16 has a composition that is ignited and burned by the combustion heat of the first transfer agent 15 and generates heat by the ignited combustion.
As the second transfer agent 16, like the first transfer agent 15, the amount of heat generated is 3500 J / g or more, and the number of moles of gas generated by combustion is 0.5 mol / 100 g or more. It is preferable to use a mixture of tetrazole, boron fine powder, molybdenum trioxide, and potassium nitrate in predetermined amounts.
[0029]
The first transfer agent 15 and the second transfer agent 16 can be of the same composition. Moreover, the composition can also be adjusted suitably. For example, the first transfer agent 15 may contain a composition that generates heat by ignition combustion, and the second transfer agent 16 may have a composition that generates heat by ignition combustion and generates high-temperature gas. Moreover, what has the composition which generate | occur | produces both the 1st and 2nd transfer agents 15 and 16 and generates heat gas by ignition combustion is also employable.
[0030]
Next, the operation of the gas generator P1 will be described with reference to FIG.
[0031]
When the collision sensor detects an automobile collision, the igniter 13 of the gas generator P1 is energized and ignited as shown in FIG. The flame caused by the ignition of the igniter 13 is ejected into the pressure combustion chamber 26 to ignite and combust the first transfer agent 15. Due to the combustion of the first transfer agent 15, heat such as a flame and high-temperature gas are generated in the pressure combustion chamber 26, and the first transfer agent 15 is instantaneously burned to the nozzle 17 side by these thermal energy. Let When the combustion of the first transfer agent 15 proceeds and the pressure combustion chamber 26 reaches a predetermined pressure, the rupture plate 27 is ruptured, and the pressure combustion chamber 26 communicates with the nozzle 17.
[0032]
The heat and high-temperature gas generated in the pressure combustion chamber 26 propagate and flow into the nozzle 17 to ignite and burn the second transfer agent 16 on the opening side of the nozzle 17. At this time, since the inner diameter of the nozzle 17 is smaller than that of the pressure combustion chamber 26, the heat and high-temperature gas generated in the pressure combustion chamber 26 are concentrated in a state of being squeezed to the opening side of the nozzle 17, and instantly. 2 Ignite and burn the transfer agent 16.
[0033]
Due to the ignition and combustion of the second transfer agent 16, heat such as flame is generated in the nozzle 17, and the second transfer agent 16 is instantaneously burned in the axial direction of the nozzle 17 by this heat. Then, the burst plate 28 is ruptured by the combustion of the second transfer agent 16, and the respective transfer holes 18 of the nozzle 17 are opened in the hollow space 6. Each of the heat transfer holes 18 is sequentially opened by combustion of the second transfer agent 16 in the axial direction, and heat such as a flame generated in the nozzle 17 is sequentially ejected into the intermediate space 6. Further, the heat of the flame or the like is ejected into the intermediate space 6 over the circumferential direction of the nozzle 17 as shown in FIG. Then, heat such as a flame ejected into the intermediate space 6 is ejected from the gas passage hole 21 formed in the inner cylindrical member 5 to the annular space S2. The gas generating agent 12 loaded in the annular space S2 is sequentially ignited and combusted by heat such as flame sequentially ejected from the gas passage hole 21 of the inner cylinder member 5. Here, since the hollow space 6 is formed over substantially the entire length of the gas generation chamber 3 (90% or more of the axial length of the gas generation chamber 3), the gas generating agent loaded in the annular space S2 12 burns efficiently. A large amount of the high-temperature gas generated by the ignition combustion of the gas generating agent 12 passes through the gas passage hole 21 formed in the inner cylinder material 5 again and is released into the hollow space 6. Here, since the hollow space 6 is formed over substantially the entire length of the gas generation chamber 3, the high-temperature gas generated in the annular space S2 efficiently flows into the hollow space 6. When the pressure in the gas generation chamber 3 reaches a predetermined pressure due to the gas flowing into the hollow space 6, the burst plate 20a provided on the partition plate 19 is ruptured. Then, the gas passes through the orifice 20 and flows into the filter chamber 4.
[0034]
Further, the high-temperature gas that has flowed into the nozzle 17 from the pressure combustion chamber 26 is released into the intermediate space 6 from the respective heat transfer holes 18 in the vicinity of the pressure combustion chamber 26. This is because a large number of the heat transfer holes 18 are formed with a small pitch between the holes in the vicinity of the pressure combustion chamber 26, so that the high temperature gas can quickly flow into the intermediate space 6 without being trapped in the nozzle 17. This is because of the structure. Thereby, it is possible to prevent the nozzle 17 from being damaged by the pressure of the high-temperature gas generated in the pressure combustion chamber 26.
[0035]
The hot gas that has flowed into the filter chamber 4 passes through the hollow portion of the filter material 7 in the filter chamber 4 and flows into the filter material 7 from the entire axial direction, where it passes through the slag collection and cooling, and passes through the gas passage space 8. It is leaked in. The cleaned gas is discharged into the airbag through each gas discharge hole 11. The airbag is rapidly inflated and deployed by the clean gas discharged from each gas discharge hole 11.
[0036]
Thus, according to the gas generator P1, the flame generated by the ignition of the igniter 13 is propagated in the axial direction in the housing 1 by the first and second transfer agents 15 and 16, and each transfer hole of the nozzle 17 is transmitted. Heat such as flame is ejected from 18 into the intermediate space 6, and the gas generating agent 12 loaded on the outer periphery of the intermediate space 6 is sequentially burned. Since the gas generated by the combustion of the gas generating agent 12 passes through the orifice 20 and is released to the filter chamber 4, the pressure of the gas released by the orifice 20 can be controlled. Since the hollow space 6 is formed and the gas generating agent 12 is loaded into the annular space S2 formed on the outer periphery thereof, the diameter of the housing 1 can be obtained even when a predetermined amount of the gas generating agent 12 is loaded. The gas generator can be made smaller and lighter. Furthermore, since the gas generating agent 12 is sequentially burned, the amount of generated gas is gradually increased, and the airbag can be gradually inflated and deployed.
In addition, since the filter member 7 is provided with a hollow portion along the axial center, the gas generated in the gas generation chamber 3 can be introduced over the entire axial direction of the filter member 7.
[0037]
Next, the gas generator P2 shown in FIG. 2 will be described. In FIG. 2, the same reference numerals as those in FIG. 1 denote the same members.
[0038]
In the gas generator P <b> 2 of FIG. 2, the fire transfer means 30 has a cylindrical shape having the same diameter as the inner cylindrical member 5 that forms the hollow space 6. As shown in FIG. 2, in the gas generator according to this embodiment, the inside of the inner cylinder member 5 is defined by a partition 22 into a hollow space 6 and a fire transfer agent chamber 6 a. A transfer agent 15 is loaded in the transfer agent chamber 6a. A plurality of heat transfer holes 18 are formed on the outer periphery of the inner cylinder member 5 constituting the heat transfer agent chamber 6a. Each of the heat transfer holes 18 is disposed over the axial direction and the circumferential direction of the inner cylinder member 5 and communicates with the annular space S2. Each of these heat transfer holes 18 is closed by a rupture plate 28 attached to the outer periphery of the inner cylinder material 5. The rupture plate 28 is formed of a metal foil such as aluminum and seals the inside of the transfer agent chamber 6 a from the gas generation chamber 3. Therefore, when the igniter 13 is ignited and the transfer agent 15 is ignited, the gas generating agent 12 in the vicinity of each transfer hole 18 is sequentially burned to the gas generating agent 12 on the filter chamber 4 side. For this reason, the amount of gas generated from the gas generating agent 12 gradually increases. Here, the length L ₁ of the hollow space 6 partitioned by the partition portion 22 is 50% or more, preferably 60% or more of the axial length L ₂ of the gas generation chamber 3. Thereby, the gas generating agent 12 is reliably burned by the flame generated by the transfer agent 15 loaded in the transfer means 30. In addition, the high-temperature gas generated in the annular space S2 efficiently flows into the hollow space 6. In addition, the inner cylinder member 5 is fitted with a holder 29 at one end on the lid member 14 side, and the holder 29 is screwed and fixed to a stepped space S <b> 1 formed in the lid member 14.
[0039]
As described above, the gas generator P <b> 2 divides the inner cylinder material 5 defining the hollow space 6 by the partition portion 22, and loads the hollow space 6 and the heat transfer agent 15 with the same inner cylinder material 5. A possible heat transfer means 30 can be formed. For this reason, a gas generator can be reduced in size, without reducing a combustion characteristic. In addition, by adjusting the length L ₁ of the hollow space 6, the amount of gas generated can be gradually increased.
[0040]
Further, the gas generator according to the present invention may have a structure shown in FIG. 3, for example. 3, the same members as those in FIGS. 1 and 2 indicate the same reference numerals. 3 differs from the gas generator P2 shown in FIG. 2 in that the inner cylinder 5 and the heat transfer means 30 are formed as separate members. The gas generation chamber 3 of the gas generator P3 includes a hollow space 6 defined by a bottomed inner cylinder material 5, an annular space S2 formed on the outer periphery of the inner cylinder material 5, and an inner cylinder material 5 A space S3 between the bottom 5a and the heat transfer means 30 is formed. The open end of the inner cylinder member 5 is fitted into a stepped portion provided on the partition plate 19. The gas generating agent 12 is loaded in the annular space S2 and the space S3. The length L ₁ of the hollow space 6 defined by the inner cylinder member 5 is 50% or more, preferably 60% or more, of the axial length L ₂ of the gas generation chamber 3. As a result, similarly to the gas generators P1 and P2 described above, the high-temperature gas generated by the combustion of the gas generating agent 12 efficiently flows into the hollow space 6.
[0041]
In this gas generator P3, the flame of the heat transfer means 30 propagates to the gas generating agent 12 located in the vicinity of the heat transfer means 30, and the gas generating agent 12 located on the filter chamber 4 side sequentially burns. The generated gas sequentially flows into the hollow space 6 and is discharged through the filter chamber 4.
[0042]
And in gas generator P1-P3, the gas generating agent containing a nitrogen-containing organic compound other than the gas generating agent containing a metal azide compound is employable. As described above, in each of the gas generators P1 to P3, even if a nitrogen-containing organic compound-based gas generating agent that is inferior in ignition performance to that of the metal azide compound-based gas generating agent is employed, ignition and combustion can be performed stably. In addition, as a gas generating agent containing a nitrogen-containing organic compound, what uses nitrogen-containing organic compounds, such as a tetrazole type compound, a triazole type compound, an amide type compound, a guanidine type compound, as a combustion component can be used. Further, the gas generating agent is not limited to a pellet shape, and may be a disk shape, a granular shape, or a hollow cylindrical shape.
[0043]
In addition, in gas generator P1-P3 in embodiment of this invention, it is not limited to what is shown in FIGS. 1-3, For example, the following forms can be taken.
(1) A configuration in which the gas generation chambers 3 are formed on both the left and right sides of the filter chamber 4 and a plurality of ignition means 13 is provided can be employed. In this case, the configuration of the gas generation chamber 3 may be any configuration of the gas generation chamber 3 of the gas generators P1 to P3 described above. Further, in this case, the filter chamber 4 may be a single chamber, and the filter material 7 may be shared by the gas generation chambers 3 on the left and right sides. Alternatively, the filter chamber 4 may be partitioned by a partition plate or the like and dedicated to each gas generation chamber 3.
(2) Combustion of the gas generating agent 12 may be adjusted by the gas discharge hole 11.
Further, the gas discharge hole 11 may be provided with a seal tape or plate made of metal, resin, or the like for adjusting the internal pressure of the gas generator and / or preventing moisture.
[0044]
【The invention's effect】
In the gas generator of the present invention, the housing is divided into a gas generation chamber and a filter chamber, and a hollow space having the same axis as the housing is formed in the gas generation chamber, and the gas generating agent is formed in the hollow space. Since the gas from the gas flows in and is released at any time, the gas generator can be miniaturized and the airbag can be gradually inflated and deployed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a gas generator according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a modification of the gas generator in the embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a modification of the gas generator in the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 2 Outer cylinder material 3 Gas generation chamber 4 Filter chamber 5 Inner cylinder material 6 Hollow space 7 Filter material 13 Ignition means 20 Orifice 21 Gas passage hole 30 Heat transfer means

Claims (4)

A long cylindrical housing closed at both ends;
Ignition means attached to at least one shaft end of the housing;
A heat transfer means connected to the ignition means, loaded with a heat transfer agent, and having a plurality of heat transfer holes;
The inside of the housing is a gas generator partitioned into a gas generation chamber in which a gas generating agent is accommodated and a filter chamber in which a filter material is attached,
In the gas generation chamber, a hollow space is defined by an inner cylinder member having a plurality of gas passage holes into which the generated gas of the gas generating agent flows.
A gas generating agent is loaded on the radially outer side of the inner cylinder member,
The hollow space communicates with the filter chamber through an orifice that controls combustion of the gas generating agent,
The gas generator is characterized in that after the generated gas is retained in the hollow space, the gas is discharged from the shaft end of the filter chamber through the orifice to the filter chamber.   2. The gas generator according to claim 1, wherein the hollow space is formed on the same axial center as the elongated cylindrical housing and has a length of 50% or more of an axial length of the gas generation chamber.   The gas generator according to claim 1, wherein the heat transfer means includes a nozzle having a plurality of heat transfer holes extending in the hollow space and opening in a radial direction.   The gas generator according to claim 1, wherein the heat transfer means has a plurality of heat transfer holes that have a cylindrical shape having the same diameter as the hollow space and open in a radial direction.

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