JP4660018B2 - Gas generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas generator for an air bag, and more particularly to a gas generator having a two-chamber structure including a gas generating chamber and a filter chamber suitable for inflating and deploying an air bag for an automobile.
[0002]
[Prior art]
In order to protect an occupant from an impact generated when a car collides, a gas generator for instantly deploying an air bag is incorporated in an air bag module mounted in, for example, an instrument panel. This gas generator generates a large amount of high-temperature gas instantaneously by a collision detection signal from a collision sensor at the time of collision.
[0003]
A gas generator for inflating an automobile airbag is required to generate a large amount of gas. Moreover, the shape is limited by the accommodation space of the airbag apparatus including the gas generator.
[0004]
In recent years, in addition to improving the performance of gas generators and reducing the size of gas generators, in particular, in order to improve safety and increase the degree of freedom in the design of storage spaces such as instrument panels that contain airbag devices. Therefore, weight reduction is desired.
[0005]
For example, a gas generator that has been used in a side-impact air bag apparatus as shown in FIG. 3 is used to reduce the size and weight of the gas generator. The gas generator shown in FIG. 3 has a series two-chamber structure in which a gas generation chamber 53 and a filter chamber 54 are partitioned by a partition member 52. The partition member 52 includes a partition plate 52a having a hole on the axial center of the gas generator called an orifice 55 and having a recess on the periphery, and an O-ring (not shown) fitted in the recess. It is comprised from such a sealing member. Further, the partition member 52 is fixed by caulking only one place from the outer peripheral edge of the gas generator housing device called the housing 51. A gas generating agent 57 is filled in the gas generating chamber 53, and a hollow cylindrical filter material 58 is mounted in the filter chamber 54. The end of the housing 51 on the filter chamber 54 side is closed by a cover plate 56, and the ignition means 59 for igniting and burning the gas generating agent 57 in the gas generating chamber 53 at the end of the housing 51 on the gas generating chamber 53 side. Is installed. In the gas generator shown in FIG. 3, the ignition means 59 is energized and ignited by a collision detection signal from a collision sensor (not shown) at the time of a collision, and this flame is ejected into the gas generation chamber 53. In the gas generation chamber 53, the gas generating agent 57 is ignited and burned by the jetted flame, and a large amount of high-temperature gas is generated. The high temperature gas generated in the gas generation chamber 53 bursts the burst plate 60 at a predetermined internal pressure, passes through the orifice 55 of the partition plate 52a, and flows into the filter chamber 54. Then, the high temperature gas flows into the filter material 58, and is discharged through a gas discharge hole 51a of the housing 51 into an airbag (not shown) through slag collection and gas cooling. The airbag is rapidly inflated and deployed by a large amount of clean gas discharged from each gas discharge hole 51a.
[0006]
[Problems to be solved by the invention]
However, in the gas generator shown in FIG. 3, the partition member 52 that divides the gas generation chamber 53 and the filter chamber 54 is caulked at only one insertion position from the outer peripheral edge of the housing 51. And since it is necessary to give a recessed part to the periphery of the partition plate 52a in order to fit an O-ring, the thickness of the partition plate 52a cannot be made thin, and the size reduction and weight reduction of the whole gas generator are prevented. It is a cause.
[0007]
An object of the present invention is to provide a gas generator having a two-chamber structure for an automobile airbag that can make a partition member thin and can be reduced in size and weight.
[0008]
[Means for Solving the Problems]
A gas generator according to claim 1 of the present invention for solving the above-mentioned problems is a long cylindrical housing closed at both ends, a gas generation chamber for storing a gas generating agent inside the housing, and a filter. A gas generator including a partition member that partitions a filter chamber on which a material is mounted, wherein the partition member includes a partition plate that partitions the gas generation chamber and the filter chamber, and a peripheral edge of the partition plate A sealing member that seals the gas generation chamber provided on the housing, and is fixed to the housing by caulking two places before and after the insertion position of the partition member from the outer peripheral edge of the housing , The seal member is deformed by the caulking of the housing to form a convex portion protruding in the longitudinal direction of the housing . The high-temperature gas generated in the gas generation chamber at the time of collision increases pressure, breaks the burst plate attached to the partition member, for example, without shifting the partition member, and flows into the filter chamber through the orifice all at once. . The gas flows throughout the filter chamber, where it passes through the filter material, passes through slag collection and cooling, and is released as a clean gas. By caulking two places before and after the insertion position of the partition member from the peripheral edge of the housing, convex portions projecting in the diameter are formed at the two caulked locations of the housing, and the partition member is formed by the two convex portions. It is pinched. Therefore, compared with the case where it is fixed by caulking at only one place, it is fixed more reliably and does not shift due to the momentum of a large amount of gas generated at the time of collision. For this reason, sufficient slag collection and cooling of the gas through the filter material are possible. Furthermore, since the partition member has a seal member such as an O-ring provided at the periphery of the partition plate, the gas generation chamber is securely sealed, and moisture flows into the gas generation chamber even during a period other than the time of the collision. Can be prevented.
[0009]
A gas generator according to a second aspect is the gas generator according to the first aspect, wherein the seal member is disposed so as to face the gas generation chamber .
[0010]
A gas generator according to a third aspect is the gas generator according to the second aspect, wherein the seal member is attached to a notch portion formed on a peripheral edge of the partition plate on the gas generation chamber side.
According to this configuration, since the partition member includes the partition plate having the notch portion and the seal member attached to the notch portion, the caulking fixability by the metal portion of the partition plate and the seal attached to the notch portion. Both sealing effects of the members can be utilized. Since the partition member is surely fixed, the partition member is not displaced by the momentum of a large amount of gas generated in the gas generation chamber at the time of collision, and sufficient slag collection and cooling through the filter material are possible. Furthermore, since the gas generation chamber is sealed by a higher sealing effect between the partition member and the housing, it is possible to more reliably prevent moisture from flowing into the gas generation chamber even during a period other than the time of a collision.
In addition, according to this configuration, since it is not necessary to form a recess in the partition plate as in the case of providing an O-ring, for example, the partition member itself can be thinned, which means that the gas generator is reduced in size and weight. Leads to. Here, a resin such as silicon rubber can be used as the seal member. When resin or the like is used for the seal member, the seal member can be easily attached to the partition plate by a joining method such as welding.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A gas generator according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. The gas generator in the embodiment of the present invention mainly inflates and deploys an automobile airbag, and burns the gas generating agent with one igniter.
[0012]
The gas generator shown in FIG. 1 includes a housing 1, an igniter 23 attached to one shaft end of the housing 1, fire transfer means 3 connected to the igniter 23, and the housing 1 as a gas generation chamber 2. And a partition member 30 partitioned into a filter chamber 12, an inner cylinder member 5 defining a hollow space 17 in the gas generation chamber 2, a gas generating agent 4 loaded on the outer periphery of the hollow space 17, and a filter And a filter material 10 mounted in the chamber 12.
[0013]
The housing 1 includes an outer cylinder member 20 that is open at both ends, a lid member 24 that closes the gas generation chamber 2 side of the outer cylinder member 20, and a lid plate 11 that closes the filter chamber 12 side. The housing 1 has a structure in which a lid member 24 and a lid plate 11 are fitted into each opening side of the outer cylinder member 20 to form a sealed space therein. The housing 1 has a long cylindrical shape with both ends closed with the lid plate 11 and the lid member 24 as the respective shaft end portions. The sealed space inside the housing 1 is divided into two chambers, a gas generation chamber 2 and a filter chamber 12, by a partition member 30.
[0014]
As shown in FIG. 1, the partition member 30 forms an orifice 13 on the axis of the housing 1. The orifice 13 enables the gas generation chamber 2 and the filter chamber 12 to communicate with each other, but is closed by a burst plate 14 attached to the partition member 30 in a normal state.
[0015]
The burst plate 14 is formed of a metal foil such as aluminum with cuts 14a, and plays a role of moisture prevention and internal pressure adjustment in the gas generation chamber 2. Accordingly, it is possible to prevent moisture from flowing into the gas generation chamber 2 even during a period other than the time of the collision. The notches 14a are provided so that when gas is generated in the gas generation chamber at the time of collision, the burst plate 14 is pierced and the gas smoothly flows into the filter chamber 12.
[0016]
On the filter chamber 12 side of the outer cylinder material 20, a plurality of gas discharge holes 8 that communicate the inside of the filter chamber 12 and an airbag (not shown) are formed at predetermined intervals in the axial direction and the circumferential direction of the outer cylinder material 20. ing. The end of the outer cylinder member 20 on the filter chamber 12 side is sealed by the cover plate 11, and the cover plate 11 is fixed by caulking the end of the outer tube member 20 in the inner direction.
[0017]
The filter material 10 is formed into a hollow cylindrical shape, for example, by an aggregate of knitted wire mesh, crimp weave, or plain weave metal wire. Thus, since the filter member 10 is provided with the hollow portion along the axial center, the gas generated in the gas generation chamber 2 can be introduced over the entire axial direction of the filter member 10. The filter material 10 is mounted in a filter chamber 12 partitioned by a partition member 30 in the housing 1 and is located between the lid plate 11 and the partition member 30. The filter material 10 forms an annular gas passage space 9 with the outer cylinder material 20.
[0018]
The gas generation chamber 2 is defined in a hollow space 17 and an annular space 27 by an inner cylindrical member 5 made of metal such as aluminum. In the hollow space 17, the heat transfer means 3 integrated with the lid member 24 extends, and the annular space 27 is filled with the gas generating agent 4. The inner cylinder member 5 has a support member 16 on the outer periphery at the end on the partition member 30 side, and is stepped together with the support member 16 so as to spread outward. The end of the inner cylinder member 5 on the partition member 30 side is bonded to the burst plate 14 by laser welding or the like. The other end 5a of the inner cylinder member 5 has a cylindrical shape as it is. The heat transfer means 3 is inserted from the other end 5 a of the inner cylinder member 5 toward the hollow space 17 in the inner cylinder member 5. A plurality of gas passage holes 15 that communicate the hollow space 17 and the annular space 27 are formed in the inner cylinder member 5, and are formed at predetermined intervals in the axial direction and the circumferential direction of the inner cylinder member 5. The hollow space 17 is formed on the same axis as the gas generation chamber 2 and is formed with a length of 50% or more, preferably 90% or more of the axial length of the gas generation chamber 2. For this reason, the gas generated in the annular space 27 efficiently flows into the hollow space 17.
[0019]
As shown in FIG. 1, the heat transfer means 3 extending into the hollow space 17 includes a heat transfer nozzle 28 extending in the axial direction concentric with the axis of the housing 1 and the pressure combustion unit 21. I have.
[0020]
The heat transfer nozzle 28 is concentric with the axis of the housing 1 and extends in the hollow space 17 in the axial direction so as to be able to communicate with the pressure combustion unit 21. The inner diameter of the heat transfer nozzle 28 is smaller than the inner diameter of the pressure combustion unit 21, and the extension length L of the heat transfer nozzle 28 is an arbitrary length dimension in the hollow space 17. Preferably, the length is set to 1/3 or more in the hollow space 17. As a result, the gas generating agent 4 can be gradually burned. Furthermore, a plurality of heat transfer holes 19 are formed in the heat transfer nozzle 28. Each of the heat transfer holes 19 is disposed in the axial direction and the circumferential direction of the fire transfer nozzle 28, and communicates with the hollow space 17 through the heat transfer nozzle 28. In addition, each of the heat transfer holes 19 is formed such that the pitch between the holes is reduced in the vicinity of the pressure combustion part 21 and the pitch between the holes is increased as the distance from the pressure combustion part 21 increases. Each of the heat transfer holes 19 is closed by a rupture plate 29 attached to the outer periphery of the heat transfer nozzle 28. The rupturable plate 29 is formed of a metal foil such as aluminum, and seals the inside of the fire transfer nozzle 28 from the inside of the hollow space 17.
[0021]
In the pressure combustion part 21, the 1st transfer agent 22 is loaded in the pressure combustion part 21 in the state which covers the front end side of the igniter 23. FIG. The first transfer agent 22 contains a composition that is ignited and combusted by a flame generated by ignition of the igniter 23, generates heat by the ignited combustion, and generates a high-temperature gas.
[0022]
As shown in FIG. 1, the second transfer agent 18 is loaded in the transfer nozzle 28 over the axial direction of the transfer nozzle 28. The second transfer agent 18 has a composition that is ignited and combusted by the combustion heat of the first transfer agent 22 and generates heat by the ignition combustion.
[0023]
The first transfer agent 22 and the second transfer agent 18 may have the same composition. Moreover, the composition can also be adjusted suitably. 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 high-temperature gas. Moreover, what has the composition which generate | occur | produces both the 1st and 2nd transfer agents 22 and 18 and generates heat gas by ignition combustion can also be employ | adopted.
[0024]
As shown in FIG. 1, the igniter 23 connected to the heat transfer means 3 is attached to the lid member 24 and ignites when energized. The igniter 23 protrudes into the pressure combustion unit 21, is energized and ignited based on a collision detection signal from a collision sensor, and jets a flame into the pressure combustion unit 21.
[0025]
As shown in FIG. 1, the gas generating agent 4 loaded in the annular space 27 of the gas generating chamber 2 generates a high-temperature gas by combustion, and is loaded over the axial direction in the gas generating chamber 2 of the housing 1. Yes. A donut-shaped two-layer cushion member 26 for closing the annular space 27 filled with the gas generating agent 4 is provided on the periphery of the other end 5 a of the inner cylinder member 5. The gas generation chamber 2 side end of the housing 1 includes a cushion member 26, a lid member 24 fitted with an O-ring 25, a fire transfer means 3, and an igniter 23. The cushion member 26 is fixed by caulking from the outer peripheral edge of the outer cylinder member 20, and the lid member 24 is fixed by caulking inward at the gas generating chamber 2 side end portion of the outer cylinder member 20.
[0026]
Here, in the gas generator shown in FIG. 1, stable ignition combustion is possible even if a gas generating agent containing a nitrogen organic compound is employed in addition to a gas generating agent containing a metal azide compound. is there. As a gas generating agent containing a nitrogen organic compound, a gas generating agent containing a nitrogen-containing organic compound such as a tetrazole compound, a triazole compound, an amide compound, or a guanidine compound can be used. Further, the gas generating agent is not limited to pellets, but may be discs, granules, or hollow cylinders.
[0027]
In this embodiment, since the partition member 30 is fixed by caulking two places before and after the insertion position of the partition member 30 from the outer peripheral edge of the housing 1, the two caulked portions of the housing 1 are within the diameter. A protruding convex portion 6 is formed, and the partition member 30 is sandwiched between the two convex portions 6. Therefore, compared with the case where only one place is fixed, it is more reliably fixed and does not shift due to a large amount of gas generated in the gas generation chamber at the time of collision. Therefore, the gas does not pass through the gap between the partition member 30 and the housing 1, breaks the burst plate 14, flows into the filter chamber through the orifice 13 of the partition member 30, and sufficient gas slag is passed through the filter material 10. Collection and cooling are possible.
[0028]
FIG. 2 shows an enlarged peripheral part of the partition member 30. The partition member 30 includes the partition plate 7 and a seal member 7b such as silicon rubber. The seal member 7b is attached to a notch 7d provided on the gas generating chamber 2 side periphery of the partition plate 7 by a joining method such as welding.
[0029]
The partition member 30 is fixed by caulking two places before and after the insertion position of the partition member 30 from the outer peripheral edge of the housing 1 so that the notch 7d side where the seal member 7b is provided faces the gas generation chamber 2. ing. As shown in FIG. 2, the peripheral edge of the partition member 30 on the filter chamber 12 side is securely caulked by the housing 1 and the projection 7 a of the partition plate 7 being engaged when the housing 1 is caulked. Is done. Therefore, the partition member 30 is not displaced by the momentum of a large amount of gas generated in the gas generating chamber at the time of collision, and the gas breaks the burst plate 14 and flows into the filter chamber 12 through the orifice 13 and is filtered by the filter material 10. Fully slag collected and cooled. On the other hand, as shown in FIG. 2, the peripheral portion of the partition member 30 on the gas generating chamber 2 side is elastically deformed by the convex portion 6 formed when the housing 1 is caulked. To do. The sealing member 7b has a high sealing effect and reliably seals the gas generation chamber 2. For this reason, it is possible to prevent moisture from flowing into the gas generation chamber 2 even during a period other than the time of the collision.
[0030]
Further, since the seal member 7b is attached to the notch 7d of the partition plate 7, it is not necessary to form a recess in the partition plate 7 as in the case of fitting an O-ring, and the partition member 30 itself is thinned. be able to. Therefore, the gas generator is reduced in size and weight. Here, when a resin such as silicon rubber is used for the sealing member 7b, the sealing member 7b can be easily attached to the notch 7d of the partition plate 7 by a joining method such as welding.
[0031]
The gas generator having such a configuration is manufactured as follows.
[0032]
First, the cover plate 11 is fitted to one end of the outer cylinder member 20, and the cover plate 11 is fixed by caulking one end of the outer tube member 20 in the inner direction. Next, the filter member 10 is brought into contact with the cover plate 11, and the partition member 30 having a sealing member attached to the periphery in advance is brought into contact with the filter member 10 from the other end of the outer tube member 20 into the outer tube member 20. Install in order. In this way, a space from the cover plate 11 to the partition member 30 is formed as the filter chamber 12. In order to close the orifice 13 of the partition plate 7 of the partition member 30, the burst plate 14 is attached to the partition plate 7 from the gas generation chamber side. Note that the burst plate 14 may be attached to the partition member 30 in advance outside the housing 1. Thereafter, by caulking the front and rear two places where the partition member 30 is inserted from the outer peripheral edge of the housing 1, convex portions 6 projecting in the diameter are formed at the two caulked positions of the housing 1, and the partition member 30 is , And sandwiched between the two convex portions 6. Then, the inner cylinder material 5 is inserted into the gas generation chamber 2 from the other end of the outer cylinder material 20. Furthermore, the inner cylinder material 5 is inserted into the gas generation chamber 2, and the stepped portion of the inner cylinder material 5 is adhered to the burst plate 14 adhered to the partition plate 7 by laser welding or the like. . The inner cylinder material 5 is fixed in the gas generation chamber 2 by the adhesion. The gas generating agent 4 is filled in the annular space 27 between the inner cylinder material 5 and the outer cylinder material 20, and the annular space 27 is closed using a donut-shaped two-layer cushion member 26. Further, the fire transfer means 3 integrated with the lid member 24 is inserted from the other end of the outer cylinder member 20 toward the hollow space 17 in the inner cylinder member 5. Finally, the cushion member 26 is fixed by caulking inward from the outer peripheral edge of the outer cylinder member 20 and the lid member 24 at the other end of the outer cylinder member 20.
[0033]
Next, the operation of the gas generator shown in FIG. 1 will be described.
[0034]
When a collision sensor (not shown) detects an automobile collision, the igniter 23 of the gas generator is energized and ignited. The flame caused by the ignition of the igniter 23 is ejected into the pressure combustion unit 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 part 21, and the first transfer agent 22 is instantaneously transferred to the transfer nozzle 28 side by these thermal energy. To burn.
[0035]
The heat generated in the pressure combustion unit 21 and the high-temperature gas propagate and flow into the fire transfer nozzle 28 to ignite and burn the second transfer agent 18 in the fire transfer nozzle 28. At this time, since the inner diameter of the heat transfer nozzle 28 is smaller than that of the pressure combustion part 21, the heat generated in the pressure combustion part 21 and the high-temperature gas are concentrated in a state of being restricted to the opening side of the heat transfer nozzle 28. The second transfer agent 18 is ignited and burned instantaneously.
[0036]
Due to the ignition combustion of the second transfer agent 18, heat such as flame is generated in the transfer nozzle 28, and the burst plate 29 is ruptured by the combustion of the second transfer agent 18, and each of the transfer nozzles 28. The heat transfer hole 19 is opened in the hollow space 17. Each of these heat transfer holes 19 is sequentially opened by the combustion of the second transfer agent 18 in the axial direction, and heat such as flame generated in the fire transfer nozzle 28 is sequentially ejected into the intermediate space 17. Further, as shown in FIG. 1, the heat of the flame or the like is jetted into the intermediate space 17 over the circumferential direction of the fire transfer nozzle 28. Then, heat such as a flame blown into the intermediate space 17 flows into the annular space 27 from the gas passage hole 15 formed in the inner cylinder material 5. The gas generating agent 4 loaded in the annular space 27 is sequentially ignited and combusted by heat such as flame sequentially ejected from the gas passage holes 15 of the inner cylinder material 5. Here, since the hollow space 17 is formed over substantially the entire length of the gas generation chamber 2 (90% or more of the axial length of the gas generation chamber 3), the gas generating agent 4 loaded in the annular space 27. Burns efficiently. A large amount of high-temperature gas generated by the ignition combustion of the gas generating agent 4 passes through the gas passage holes 15 formed in the inner cylinder material 5 again and is released 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 generating chamber 2 reaches a predetermined pressure due to the gas flowing into the hollow space 17, the burst plate 14 attached to the partition plate 7 is ruptured from the cut 14a. Then, the gas passes through the orifice 13 and flows into the filter chamber 12.
[0037]
Further, the high-temperature gas that has flowed into the heat transfer nozzle 28 from the pressure combustion part 21 is released into the intermediate space 17 from each heat transfer hole 19 in the vicinity of the pressure combustion part 21. This is because a large number of the heat transfer holes 19 are formed with a small pitch between the holes in the vicinity of the pressure combustion part 21 so that the high temperature gas is not trapped in the heat transfer nozzle 28 and quickly enters the intermediate space 17. This is because the structure is made to flow out. Thereby, it is possible to prevent the fire transfer nozzle 28 from being damaged due to the pressure of the high-temperature gas generated in the pressure combustion section 21.
[0038]
The hot gas that has flowed into the filter chamber 12 passes through the hollow portion of the filter material 10 in the filter chamber 12 and then flows into the filter material 10 from the entire axial direction, where the gas passage space passes through slag collection and cooling. 9 flows out. Then, the cleaned gas is discharged into an air bag (not shown) through each gas discharge hole 8. The airbag (not shown) is rapidly inflated and deployed by clean gas discharged from each gas discharge hole 8.
[0039]
As described above, according to the gas generator shown in FIG. 1, the flame generated by the ignition of the igniter 23 is propagated in the axial direction in the housing 1 by the first and second transfer agents 22, 18, and the transfer nozzle Heat, such as flame, is ejected from the 28 heat transfer holes 19 into the intermediate space 17, and the gas generating agent 4 loaded on the outer periphery of the intermediate space 17 is sequentially burned. In this way, combustion is sequentially started to the igniter 23, the heat transfer means 3, and further to the gas generation chamber 2, and the gas generating agent 4 is sequentially burned, so that the amount of generated gas is gradually increased. Thus, the airbag (not shown) can be gradually inflated and deployed. In addition, since the gas passes through the orifice 13 and flows into the filter chamber 12, the pressure of the gas flowing in through the orifice 13 can be controlled.
[0040]
In addition, the gas generator in embodiment of this invention is not limited to what is shown in FIG.1 and FIG.2, For example, the following forms can be taken.
(1) The partition member 30 may be installed in the housing 1 such that the notch 7d side where the seal member 7b is provided faces the filter chamber.
(2) The partition plate 7 may be provided with a concave portion instead of the notch portion 7d at the periphery, and a sealing member such as an O-ring may be fitted into the concave portion. Further, the sealing member may not be welded to the partition plate 7.
(3) An O-ring having a diameter substantially the same as the inner diameter of the housing 1 is provided next to at least one of the gas generation chamber side and the filter chamber side of the partition plate 7, and the partition plate 7 is inserted from the outer peripheral edge of the housing 1. It may be fixed by caulking two places before and after the place. In this case, the O-ring is elastically deformed by the two convex portions formed when caulking, and a high sealing effect can be obtained.
(4) A configuration in which the gas generation chambers 2 are formed on both the left and right sides of the filter chamber 12 and a plurality of igniters 23 are provided may be employed. In this case, the configuration of the gas generation chamber 2 may be the configuration of the gas generation chamber 2 in the aforementioned gas generator. Further, in this case, the filter chamber 12 may be a single chamber, and the filter material 10 may be shared by the gas generation chambers 2 on the left and right sides. Alternatively, the filter chamber 12 may be partitioned by an additional partition member or the like and dedicated to each gas generation chamber 2.
(5) Combustion of the gas generating agent 4 may be adjusted by the gas discharge hole 8. The gas discharge hole 8 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 for preventing moisture.
[0041]
【The invention's effect】
In the gas generator having a two-chamber structure according to the present invention, a convex portion protruding in the diameter is formed at the two caulked locations of the housing by caulking the front and rear portions of the insertion portion of the partition member from the outer peripheral edge of the housing. The partition member is sandwiched between the two convex portions. Compared with the case where it is fixed by caulking at only one place, it is fixed more securely and will not be displaced by the momentum of a large amount of gas generated in the gas generation chamber at the time of collision. Therefore, the gas generated in the gas generation chamber does not pass through the gap between the partition member and the housing, for example, breaks the burst plate attached to the orifice of the partition member and flows into the filter chamber through the orifice. For this reason, sufficient slag collection and cooling via the filter material are possible. The partition member can also seal the gas generation chamber and prevent moisture from flowing into the gas generation chamber even during a period other than the time of the collision. Furthermore, with respect to the partition member, by providing a seal member on the periphery of the partition plate, it is possible to ensure a higher sealing effect with respect to the gas generation chamber and fixability by the partition member.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a gas generator according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a peripheral edge portion of a partition member in FIG.
FIG. 3 is a cross-sectional view showing an example of a conventional gas generator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 2 Gas generation chamber 3 Fire transfer means 4 Gas generating agent 5 Inner cylinder material 6 Caulking 7 Partition plate 7a Partition plate convex part 7b Seal member 7c Seal member convex part 7d Notch part 10 Filter material 12 Filter chamber 23 Igniter 30 Partition member

Claims (3)

A long cylindrical housing closed at both ends;
A gas generator comprising a gas generating chamber for storing a gas generating agent inside the housing and a partition member for partitioning a filter chamber on which a filter material is mounted,
The partition member includes a partition plate that divides the gas generation chamber and the filter chamber, and a seal member that seals the gas generation chamber provided at a peripheral edge of the partition plate, and the insertion position of the partition member Are fixed to the housing by caulking the front and rear two locations from the outer peripheral edge of the housing, and the seal member is deformed by the caulking of the housing and protrudes in the longitudinal direction of the housing. A gas generator characterized by forming a part . The gas generator according to claim 1, wherein the seal member is disposed so as to face the gas generation chamber.   The gas generator according to claim 2, wherein the seal member is attached to a notch formed in a peripheral edge of the partition plate on the gas generation chamber side.

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