JP2003002153A - Gas generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas generator for a car air bag capable of thinning out a partition plate to achieve reduction in size and weight. SOLUTION: The gas generator comprises a housing 1 of lengthy cylindrical shape with both ends closed, and a partition plate 7 demarcating the inside of the housing 1 into a gas generating chamber 2 containing a gas generating agent 4, and a filter chamber 12 having a filter member 10 mounted in. The gas generator is characterized in that the partition plate 7 is fixed to a caulking part 6 of the housing 1, with weld 30 applied to the whole circumference of the circumferential edge part of the gas chamber 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas generator for an air bag, and more particularly to a gas having a two-chamber structure including a gas generation chamber and a filter chamber suitable for inflating and deploying an automobile air bag. Regarding the generator.

[0002]

2. Description of the Related Art An air bag gas generator for protecting an occupant from a shock generated when a vehicle crashes is housed in an air bag module mounted in, for example, an instrument panel. This gas generator instantly generates a large amount of high temperature gas in response to a collision detection signal from a collision sensor at the time of a collision, and inflates the airbag.

In recent years, in particular, in addition to improving the performance of the gas generator, in addition to improving the performance of the gas generator, in order to improve the safety and increase the degree of freedom in the design of the accommodation space such as the instrument panel for accommodating the airbag device. There is an increasing demand for smaller size and lighter weight.

FIG. 3 shows an example of a gas generator that has been conventionally used in a side impact airbag device. This gas generator has a serial two-chamber structure in which a gas generating chamber 53 and a filter chamber 54 are partitioned by a partition plate 52. The partition plate 52 has a hole called an orifice 55 on the axial center of the gas generator, and has a recess at the periphery thereof, and the recess has a seal member such as an O-ring (not shown). Are fitted. Further, the partition plate 52 is fixed by caulking the insertion portion from the outer peripheral edge of the housing device of the gas generator called the housing 51. The gas generating chamber 53 is filled with a gas generating agent 57, and the filter chamber 54 is equipped with a hollow cylindrical filter material 58. The end of the housing 51 on the filter chamber 54 side is closed by a cover plate 56,
Further, an ignition means 59 for igniting and burning the gas generating agent 57 in the gas generating chamber 53 is attached to an end of the housing 51 on the gas generating chamber 53 side. In the gas generator shown in FIG. 3, at the time of a collision, the ignition means 59 is energized and ignited by a collision detection signal from a collision sensor (not shown), and this flame is ejected into the gas generation chamber 53. Gas generation chamber 53
Inside, the gas generating agent 57 is ignited and burned by the ejected flame, and a large amount of high-temperature gas is generated. Gas generation chamber 53
The high-temperature gas generated inside the orifice 55 of the partition plate 7
The burst plate 60, which is attached to the partition plate 7 so as to cover it, bursts at a predetermined internal pressure, passes through the orifice 55 of the partition plate 52, and flows into the filter chamber 54. Then, the high-temperature gas flows into the filter material 58, where it is slag-collected and gas-cooled, and then discharged from each gas discharge hole 51a of the housing 51 into an airbag (not shown). The airbag is rapidly inflated and deployed by a large amount of clean gas released from each gas release hole 51a.

[0005]

However, in the gas generator shown in FIG. 3, a partition plate 52 is provided with a sealing member such as an O-ring for the purpose of sealing the gas generating chamber 53.
It was necessary to form a concave portion on the peripheral edge of the partition plate 52 in order to fit it in. For this reason, the thickness of the partition plate 52 itself cannot be reduced, which is one of the factors that hinder the reduction in size and weight of the entire gas generator.

[0006] It is an object of the present invention to provide a gas generator used in an air bag for an automobile, in which the partition plate can be made thin and the size and weight can be reduced.

[0007]

A gas generator according to claim 1 of the present invention for solving the above-mentioned problems, comprises a long cylindrical housing having both ends closed, and a gas generation inside the housing. A gas generator comprising: a partition plate for partitioning a gas generation chamber containing an agent and a filter chamber in which a filter material is mounted, wherein the partition plate is fixed to a caulking portion formed by caulking the housing. The entire circumference of the partition plate is welded from the gas generating chamber side. The high-temperature gas generated in the gas generation chamber at the time of collision increases the pressure, reaches a predetermined pressure, and then passes through the orifice at once and flows into the filter chamber. At this time, since the peripheral edge of the partition plate on the filter chamber side is fixed to the caulked portion of the housing, the partition plate does not shift to the filter chamber side due to the pressure of the gas in the gas generation chamber. The gas flows throughout the filter chamber where it passes through the filter material for cooling and slag collection,
It is released as clean gas. On the other hand, by welding the entire circumference of the peripheral edge of the partition plate on the gas generation chamber side, the gas generation chamber can be reliably sealed from outside the gas generation chamber.
While preventing functional deterioration of the gas generating agent, etc. due to humidity contained in the outside air, the gas generated at the time of collision is not passed through the orifice but passes through the gap between the partition plate and the housing and is released into the airbag without passing through the filter material. It is possible to prevent. Since the sealing effect by welding can be expected, it is not necessary to fit a seal member such as an O-ring to the partition plate, and it is not necessary to provide a recess for fitting the seal member to the peripheral edge of the partition plate. Therefore, the thickness of the partition plate itself can be made relatively thin, and the overall size and weight of the gas generator can be reduced. Further, the welding in the present invention is intended to improve not the fixed strength (that is, the fixing strength by welding of the partition plate) but the sealing property, and therefore, the large-scale welding such as a welding machine usually used for improving the strength is required. There is no need to make capital investment.

A gas generator according to claim 2 is the gas generator according to claim 1.
In, the welding is laser welding.
By performing laser welding on the entire circumference of the peripheral edge of the partition plate on the gas generation chamber side, it is possible to provide reliable sealing effect for sealing the gas generation chamber.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An example of a gas generator according to an embodiment of the present invention will be described with reference to FIGS. The gas generator according to the embodiment of the present invention mainly expands and deploys an automobile airbag, and burns a gas generating agent with one igniter.

The gas generator shown in FIG. 1 has a housing 1
And an igniter 2 mounted on one shaft end of the housing 1.
3, a flame transfer means 3 connected to the igniter 23, a partition plate 7 for partitioning the housing 1 into a gas generation chamber 2 and a filter chamber 12, and a hollow space 17 defined in the gas generation chamber 2. The tubular member 5 and the annular space 27 around the hollow space 17
The gas generating agent 4 loaded in the filter chamber 10 and the filter material 10 mounted in the filter chamber 12 are provided.

The housing 1 has an outer cylindrical member 2 having both ends open.
0 and a lid member 2 for closing the gas generation chamber 2 side of the outer tubular member 20.
4 and a lid plate 11 that closes the filter chamber 12 side. The housing 1 includes a lid member 24 and a lid plate 1.
1 is a structure that is fitted into each opening side in the outer tubular member 20 to form a sealed space inside. The housing 1 has a lid plate 11
And the lid member 24 as the respective axial ends, and both ends are closed to form a long cylindrical shape. The sealed space inside the housing 1 is divided by the partition plate 7 into the gas generation chamber 2 and the filter chamber 1.
It is divided into 2 rooms.

The partition plate 7, as shown in FIG.
An orifice 13 is formed on the axis of the housing 1. The orifice 13 allows the gas generating chamber 2 and the filter chamber 12 to communicate with each other, but is closed by a burst plate 14 attached to the partition plate 7 in a normal state.

The burst plate 14 has a cut 1
It is formed of a metal foil such as aluminum containing 4a and plays a role of preventing moisture inside the gas generating chamber 2 and adjusting the internal pressure.
As a result, it is possible to prevent moisture from flowing into the gas generation chamber 2 even during a period other than the time of collision. Also,
The notch 14a is provided so that when the gas is generated in the gas generating chamber at the time of collision, the burst plate 14 is pierced and the gas smoothly flows into the filter chamber 12.

On the filter chamber 12 side of the outer tubular member 20, a plurality of gas release holes 8 for communicating the inside of the filter chamber 12 with an airbag (not shown) are provided at predetermined intervals in the axial direction and the circumferential direction of the outer tubular member 20. Is formed in. The end portion of the outer tubular member 20 on the filter chamber 12 side is closed by a lid plate 11, and the lid plate 11 is fixed by caulking the end portion of the outer tubular member 20 inward.

The filter material 10 is formed into a hollow cylindrical shape by, for example, an assembly of knitted wire mesh, crimp weave or plain weave metal wire. As described above, since the filter member 10 is provided with the hollow portion along the axial center, the gas generated in the gas generation chamber 2 is not filtered by the filter member 10
Can be introduced over the entire axial direction. The filter material 10 is mounted in a filter chamber 12 defined by a partition plate 7 in the housing 1, and is located between the lid plate 11 and the partition plate 7. The filter material 10 and the outer tubular material 20 form an annular gas passage space 9
Is formed.

The gas generating chamber 2 is divided into a hollow space 17 and an annular space 27 by an inner cylindrical member 5 made of metal such as aluminum. The flame transfer means 3 integrated with the lid member 24 extends in the hollow space 17, and the annular space 27 is filled with the gas generating agent 4. The inner tubular member 5 has a support member 16 on the outer periphery of the partition plate 7 side end portion.
Along with 6, the step processing is performed so as to spread outward. The end portion of the inner tubular member 5 on the partition plate 7 side is adhered to the burst plate 14 attached to the partition plate 7 by laser welding or the like. The other end 5a of the inner tubular member 5 is
It has the same shape as a cylinder. The other end 5a of the inner tubular member 5
The flame transfer means 3 is inserted from toward the hollow space 17 in the inner tubular member 5. Further, a plurality of gas passage holes 15 that communicate the hollow space 17 and the annular space 27 are formed in the inner tubular member 5, and are formed at predetermined intervals in the axial direction and the circumferential direction of the inner tubular member 5. The hollow space 17 is formed on the same axis as the gas generation chamber 2, and is 50% of the axial length of the gas generation chamber 2.
As described above, the length is preferably 90% or more.
Therefore, the gas generated in the annular space 27 efficiently flows into the hollow space 17.

The flame transfer means 3 extending into the hollow space 17 is
As shown in FIG. 1, the hollow space 17 is provided with a flame transfer nozzle 28 that extends in the axial direction with the shaft center of the housing 1 being concentric with the shaft center of the housing 1, and a pressure combustion unit 21 configured in the lid member 24.

The transfer nozzle 28 is concentric with the axis of the housing 1 and extends in the hollow space 17 in the axial direction.
It can communicate with the pressure combustion unit 21. Further, the inner diameter of the transfer nozzle 28 is smaller than the inner diameter of the pressure combustion unit 21, and the extension length L of the transfer nozzle 28 is the hollow space 1
It has an arbitrary length dimension within 7. Preferably, the length of the hollow space 17 is set to 1/3 or more. This makes it possible to gradually burn the gas generating agent 4. Further, the transfer nozzle 28 is formed with a plurality of transfer holes 19. Each of the transfer holes 19 is arranged in the axial direction and the circumferential direction of the transfer nozzle 28.
The inside communicates with the hollow space 17. Also, each transfer hole 1
No. 9 reduces the pitch between holes in the vicinity of the pressure combustion unit 21,
The pitch between the holes increases as the distance from the pressure combustion unit 21 increases. Each of these transfer holes 19
It is closed by a rupture plate 29 attached to the outer periphery of the transfer nozzle 28. The rupture plate 29 is formed of a metal foil such as aluminum and seals the inside of the transfer nozzle 28 from the inside of the hollow space 17.

In the pressure combustion section 21, the first transfer agent 22
Is loaded in the pressure combustion unit 21 in a state of covering the tip side of the igniter 23. The first transfer agent 22 is an igniter 23.
The composition contains a composition that is ignited and burned by a flame resulting from the ignition of, and heat is generated by the ignition and combustion to generate a high temperature gas.

Further, as shown in FIG.
The second transfer agent 18 is loaded inside thereof in the axial direction of the transfer nozzle 28. The second transfer agent 18 has a composition that is ignited and burned by the combustion heat of the first transfer agent 22 and generates heat by the ignited combustion.

The first transfer agent 22 and the second transfer agent 1
It is also possible to use those having the same composition as 8. Further, its composition can be adjusted appropriately. For example, the first transfer agent 22 may contain a composition that generates heat by ignition combustion, and the second transfer agent 18 may have a composition that generates heat by ignition combustion and generates a high temperature gas. Moreover, both the first and second transfer agents 22 and 18 are
It is also possible to employ a material having a composition that generates heat by ignition combustion and generates a high temperature gas.

The igniter 23 connected to the flame transfer means 3 is
As shown in FIG. 1, it is attached to the lid member 24 and ignites when energized. The igniter 23 has a pressure combustion unit 21.
It is projected inside and is energized and ignited based on a collision detection signal from a collision sensor, and a flame is ejected into the pressure combustion unit 21.

As shown in FIG. 1, the gas generating agent 4 charged in the annular space 27 of the gas generating chamber 2 generates high temperature gas by combustion, and the gas generating chamber 2 of the housing 1
It is loaded in the axial direction. A donut-shaped two-layer cushion member 26 for closing the annular space 27 filled with the gas generating agent 4 is provided at the periphery of the other end 5a of the inner tubular member 5. The end portion of the housing 1 on the gas generation chamber 2 side is
It is composed of a cushion member 26, a lid member 24 into which an O-ring 25 is fitted, a flame transfer means 3, and an igniter 23. The cushion member 26 is formed from the outer peripheral edge of the outer tubular member 20,
The lid member 24 is fixed by caulking inward at the end of the outer tubular member 20 on the gas generation chamber 2 side.

Here, in the gas generator shown in FIG. 1, stable ignition is achieved even if a gas generating agent containing a nitrogen-containing organic compound is adopted in addition to the gas generating agent containing a metal azide compound. Burning is possible. As the gas generating agent containing a nitrogen-containing organic compound, those containing a nitrogen-containing organic compound such as a tetrazole compound, a triazole compound, an amide compound and a guanidine compound as a combustion component can be used. Further, the gas generating agent is not limited to the pellet-like one, and may be disc-like, granule-like, or hollow columnar one.

Next, the features of the partition plate 7 in this embodiment will be described with reference to FIG. The partition plate 7 has an outer cylindrical member 20 of the housing 1 at the peripheral portion on the filter chamber 12 side.
Is fixed to a caulking portion 6 formed by caulking inside, and a welding 30 by laser welding is applied to the entire periphery of the gas generating chamber 2 side peripheral portion. Filter chamber 12 of outer cylinder 20
A convex caulking portion 6 protruding inward is formed on the side peripheral edge portion, and the partition plate 7 is securely fixed to the caulking portion 6, so that the pressure of the gas in the gas generating chamber 2 generated at the time of collision causes The partition plate does not shift to the filter chamber side.
On the other hand, by performing welding 30 by laser welding on the entire circumference of the peripheral edge of the partition plate 7 on the gas generation chamber 2 side, the gas generation chamber 2 can be reliably sealed. Therefore, the function of the gas generating agent 4 and the like is prevented from deteriorating due to the humidity contained in the outside air, and the gas generated at the time of collision is not the orifice 13 but the partition plate
It is possible to prevent the gas from passing through the gap between the housing 1 and the housing 1 and being discharged into the airbag without passing through the filter material 10.

Since the sealing effect of the welding 30 can be expected, it is not necessary to fit a sealing member such as an O-ring to the partition plate 7. Therefore, it is not necessary to form a recess for fitting the seal member in the peripheral edge of the partition plate 7, and the thickness of the partition plate 7 itself can be made relatively thin, and the overall size of the gas generator can be reduced.
Weight reduction is possible.

Since the welding 30 is intended to improve not only the fixing strength but also the sealing property, it is not necessary to make a large-scale capital investment for a welding machine which is usually used for improving the strength. That is, a welding effect can be expected by welding to the extent that the gap between the partition plate 7 and the housing 1 is closed, and it is not necessary to perform welding with a thickness for the purpose of improving strength.

The gas generator having such a structure is manufactured as follows.

First, the lid plate 11 is fitted to one end of the outer tubular member 20, and the lid plate 11 is fixed by caulking one end of the outer tubular member 20 inward. Next, the filter material 10
Are placed in order from the other end of the outer tubular member 20 into the outer tubular member 20 so as to contact the cover plate 11 and the partition plate 7 to the filter member 10. After that, the peripheral edge of the partition plate 7 on the filter chamber 12 side is caulked from the outer peripheral edge of the housing 1, and the partition plate 7 is fixed so as to be engaged with the housing 1 by the convex caulking portion 6 protruding inwardly formed. To be done. Further, welding 30 is applied to the entire circumference of the peripheral edge of the partition plate 7 on the gas generating chamber 2 side by laser welding.
In this way, the space from the cover plate 11 to the partition plate 7 is formed as the filter chamber 12. In order to close the orifice 13 of the partition plate 7, the burst plate 14 is attached from the gas generating chamber 2 side so as to cover the orifice 13. The burst plate 14 may be attached to the partition plate 7 outside the housing 1 in advance. Then, the inner tubular member 5 is inserted into the gas generating chamber 2 from the other end of the outer tubular member 20, and the stepped portion of the inner tubular member 5 is brought into contact with the burst plate 14 attached to the partition plate 7. Adhere by laser welding, etc. The inner tubular material 5 is
It is fixed in the gas generating chamber 2 by the adhesion. The annular space 27 between the inner tubular member 5 and the outer tubular member 20 is filled with the gas generating agent 4, and the annular space 27 is closed using a two-layer cushion member 26 having a donut shape. Further, the flame transfer means 3 integrated with the lid member 24 is inserted from the other end of the outer tubular member 20 toward the hollow space 17 in the inner tubular member 5. Finally, the cushion member 26 is fixed by caulking inward from the outer peripheral edge of the outer tubular member 20, and the lid member 24 at the other end of the outer tubular member 20.

Next, the operation of the gas generator shown in FIG. 1 will be described.

When a collision sensor (not shown) detects a collision of an automobile, the igniter 23 of the gas generator is energized and ignited.
The flame generated by the ignition of the igniter 23 is ejected into the pressure combustion section 21 to ignite and burn the first transfer agent 22. Due to the combustion of the first transfer agent 22, heat such as flame and high-temperature gas are generated in the pressure combustion unit 21, and the thermal energy of these causes the first transfer agent 22 to instantaneously flow to the transfer nozzle 28 side. To burn.

The heat and high temperature gas generated in the pressure combustion section 21 propagate and flow into the transfer nozzle 28 to ignite and burn the second transfer agent 18 in the transfer nozzle 28. At this time, since the inner diameter of the transfer nozzle 28 is set to be smaller than the pressure combustion section 21, the heat generated in the pressure combustion section 21,
And the high-temperature gas are concentrated in a state of being squeezed to the opening side of the transfer nozzle 28, and instantly ignite and burn the second transfer agent 18.

By the ignition and combustion of the second transfer agent 18,
Heat such as a flame is generated in the transfer nozzle 28, and the rupture plate 29 is ruptured by the combustion of the second transfer agent 18, so that each transfer hole 19 of the transfer nozzle 28 is opened in the hollow space 17. . Each of these flame transfer holes 19 is sequentially opened by the combustion of the second transfer agent 18 in the axial direction, and the heat of the flame or the like generated in the transfer nozzle 28 is sequentially ejected into the hollow space 17.
Further, the heat of the flame or the like is jetted into the hollow space 17 over the circumferential direction of the transfer nozzle 28, as shown in FIG.
Then, heat such as flame ejected into the hollow space 17 flows into the annular space 27 from the gas passage hole 15 formed in the inner tubular member 5. The gas generating agent 4 loaded in the annular space 27 is sequentially ignited and burned by the heat of the flame or the like sequentially ejected from the gas passage holes 15 of the inner tubular member 5. Here, since the hollow space 17 is formed over substantially the entire length of the gas generating chamber 2 (90% or more of the axial length of the gas generating chamber 3), the gas generating agent 4 loaded in the annular space 27. Burns efficiently. Then, by the ignition and combustion of the gas generating agent 4,
The large amount of generated high-temperature gas passes through the gas passage hole 15 formed in the inner tubular member 5 again and is discharged into the hollow space 17. Here, since the hollow space 17 is formed over substantially the entire length of the gas generation chamber 2, the high temperature gas generated in the annular space 27 efficiently flows into the hollow space 17. When the pressure in the gas generation chamber 2 reaches a predetermined pressure by the gas flowing into the hollow space 17, the burst plate 14 attached to the partition plate 7 bursts from the cut 14a. Then, the gas passes through the orifice 13 and passes through the filter chamber 12
Flows in. At this time, the filter chamber 12 of the partition plate 7
Since the side peripheral portion is securely fixed to the caulking portion 6 of the housing, the partition plate 7 does not shift to the filter chamber 12 side due to the pressure of the gas in the gas generating chamber 2.

Further, from the pressure combustion section 21 to the transfer nozzle 28.
The high-temperature gas that has flowed in is escaped into the hollow space 17 from the respective flame transfer holes 19 near the pressure combustion section 21. This is because a large number of flame transfer holes 19 are formed in the vicinity of the pressure combustion section 21 with a small pitch between the holes, so that high temperature gas is not confined in the transfer nozzle 28 and the hollow space 17 is quickly formed.
This is because it has a structure that allows it to flow out. by this,
It is possible to prevent the transfer nozzle 28 from being damaged by the pressure of the high temperature gas generated in the pressure combustion unit 21.

The high-temperature gas flowing into the filter chamber 12 flows through the hollow portion of the filter material 10 in the filter chamber 12 into the filter material 10 from the entire axial direction, where it is subjected to slag collection and cooling, It flows out into the gas passage space 9. Then, the purified gas is supplied to each gas release hole 8
Is discharged into the airbag not shown. The airbag (not shown) is rapidly inflated and deployed by the clean gas released from each gas release hole 8.

As described above, according to the gas generator shown in FIG. 1, the flame caused by the ignition of the igniter 23 is
The heat transfer agents 22 and 18 propagate in the axial direction within the housing 1, and the heat such as flame is ejected from each of the transfer holes 19 of the transfer nozzle 28 into the hollow space 17, and is loaded on the outer periphery of the hollow space 17. The generated gas generating agent 4 is sequentially burned. In this way, the combustion is sequentially started to the igniter 23, the transfer means 3, and further to the gas generating chamber 2, and the gas generating agent 4 is sequentially burned, so that the generated gas generation amount is gradually increased. Therefore, it is possible to gradually inflate and deploy an airbag (not shown). Further, since the gas passes through the orifice 13 and flows into the filter chamber 12, the pressure of the gas flowing in can be controlled by the orifice 13.

The gas generator according to the embodiment of the present invention is not limited to those shown in FIGS. 1 and 2, but may be in the following forms. (1) Before inserting the partition plate 7, the housing 1 may be preliminarily provided with the caulking portion 6. In this case, the partition plate 7 is not engaged with the housing 1, but is fitted and fixed to the caulking portion 6. (2) Welding 30 may be applied to the entire circumference of the peripheral edge of the partition plate 7 on the gas generation chamber 2 side by a method other than laser welding.
(3) The caulking portion 6 for fixing the partition plate 7 may be provided at two places. That is, welding 30 is applied to the entire circumference of the peripheral edge of the partition plate 7 on the gas generating chamber 2 side.
After performing the above step, the partition plate 7 may also be caulked from the outer peripheral edge of the housing 1 on the gas generating chamber 2 side. (4) The gas generating agent 4 may be contained in the entire gas generating chamber 2. (5) The gas generating chambers 2 may be formed on the left and right sides of the filter chamber 12, and a plurality of igniters 23 may be provided.
In this case, the configuration of the gas generation chamber 2 may be the configuration of the gas generation chamber 2 in the gas generator described above. In this case, the filter chamber 12 is set as one chamber and the filter material 10
The gas generation chambers 2 on both the left and right sides may be shared. Also,
The filter chamber 12 is divided by an additional partition plate,
It may be dedicated to each gas generation chamber 2. (6) The combustion of the gas generating agent 4 may be adjusted by the gas release holes 8. Further, the gas release hole 8 may be provided with a seal tape or plate made of metal or resin for adjusting the internal pressure of the gas generator and / or for preventing moisture.

[0038]

In the gas generator of the present invention, since the peripheral edge of the partition plate on the filter chamber side is fixed to the caulking portion of the housing, the partition plate shifts to the filter chamber side due to the pressure of the gas in the gas generation chamber. There is no. on the other hand,
By welding the entire periphery of the peripheral edge of the partition plate on the gas generation chamber side, it is possible to expect a sealing effect that reliably seals the gas generation chamber and shuts off the outside air. No need to fit into. Therefore, it is not necessary to form a recess for fitting the seal member on the peripheral edge of the partition plate, and the thickness of the partition plate itself can be made relatively thin, and the gas generator as a whole can be made smaller and lighter.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a gas generator according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a part of the peripheral edge of the partition plate in FIG.

FIG. 3 is a cross-sectional view showing an example of a conventional gas generator.

[Explanation of symbols]

1 housing 2 gas generation chamber 3 fire means 4 gas generating agents 5 Inner tube material 6 Caulking part 7 partition boards 10 Filter material 12 Filter chamber 23 igniter 30 welding

Claims (2)

[Claims] 1. A long cylindrical housing having both ends closed, and a partition plate for partitioning a gas generating chamber containing a gas generating agent and a filter chamber in which a filter material is mounted inside the housing. A gas generator characterized in that the partition plate is fixed to a caulking portion formed by caulking the housing, and the entire circumference of the partition plate is welded from the gas generating chamber side. vessel. 2. The welding is laser welding.
The gas generator described in.