JP2005349849A - Gas generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a gas for an air bag which is formed using a solid gas generating agent and does not block a gas discharge port for discharging a combustion gas outside a combustion chamber when the gas generator is operated. Provision of a vessel.
A combustion chamber formed using a solid gas generating agent and provided in an internal space of a housing is formed by a wall member provided with a gas discharge port for discharging the combustion gas at a downstream end surface of the combustion gas. The wall member has a concavo-convex portion that protrudes or is recessed with respect to the combustion chamber, and the gas discharge port is inside a groove or a recess formed on the combustion chamber side by the concavo-convex portion. A gas generator for an air bag, wherein at least one of the gas discharge ports is open in a space portion in which the gas generating agent is not present in the groove or the depression.
[Selection] Figure 2

Description

  The present invention relates to a gas generator and an airbag apparatus suitable for an airbag system mounted on various vehicles.

  A gas generator for an air bag is used as a gas generator for inflating an air bag in an air bag device for protecting an occupant. Conventionally, as such a gas generator for an air bag, a gas generator using a pressurized gas, a gas generator using a gas generating agent that generates gas by combustion (pyrotechnic gas generator), and There is provided a gas generator (hybrid gas generator) using a pressurized gas and a gas generating agent.

  In a gas generator formed using a solid gas generating agent, such as a pyrotechnic gas generator or a hybrid gas generator, the solid gas generating agent is a housing as an outer container of a gas generator for an air bag. It is filled in the combustion chamber secured inside. In many cases, the side surface of the combustion chamber in the gas discharge direction is partitioned by a filter for filtering and cooling the gas generated by the combustion of the gas generating agent and a wall member.

  These filters and wall members that define the combustion chamber are formed with gas discharge ports for releasing the gas generated in the combustion chamber to the outside of the combustion chamber. In the wall member, the through-hole penetrating in the thickness direction is used as the gas discharge port.

  For example, Patent Literature 1 discloses an air bag gas generator that uses a through hole formed in a partition wall that defines a side surface of a combustion chamber in the gas discharge direction as a gas discharge port.

In the gas generator for an air bag disclosed in Patent Document 1, a combustion chamber for storing a gas generating agent is formed in an annular shape with an ignition means disposed at the center, and an outer peripheral side thereof is partitioned by an annular partition. . The partition wall is formed with a communication hole penetrating in the thickness direction for discharging the gas generated by the combustion of the gas generating agent filled in the combustion chamber to the outside of the combustion chamber. Since the partition wall in which such a through hole is formed defines the outer peripheral side of the combustion chamber, the gas generating agent present in the combustion chamber is in direct contact with the partition wall.
International Publication WO02 / 083464

  The present invention provides a gas generator for an air bag capable of smoothly discharging a gas for inflating an air bag.

  The present invention also provides a gas generator for an air bag in which the flow of gas for inflating the air bag is not hindered inside the gas generator.

  Further, according to the present invention, in a gas generator for an air bag using a solid gas generating agent, the gas discharge port for discharging the gas outside the combustion chamber is closed with the gas generating agent when the gas generator is operated. Provided is a gas generator for an air bag having no air bag.

  In order to solve the above-mentioned conventional problems, the present invention releases the gas generated in the combustion chamber to the outside of the combustion chamber so that at least one of the gas discharge ports is not blocked by the gas generating agent. The gas generator for airbags formed in the wall member which divides the downstream end surface of combustion gas is provided.

  That is, a gas generator for an air bag formed by using a solid gas generating agent that generates combustion gas, and the gas generating agent is accommodated in an internal space of a housing that is an outer container of the gas generator. A combustion chamber is provided, and an end face on the downstream side of the combustion gas in the combustion chamber is partitioned by a wall member provided with a gas discharge port for discharging the combustion gas. The gas discharge port is formed inside a groove or depression formed on the combustion chamber side by the uneven portion, and has at least any gas. The discharge port is a gas generator for an air bag that is open in a space portion in which the gas generating agent does not exist in the groove or the depression.

  The wall member generally defines a downstream end face of the combustion gas of the combustion chamber filled with the gas generating agent, and flows in a direction in which the combustion gas generated in the combustion chamber is discharged from the housing. At the time of the downstream of the combustion chamber. For example, when a filter for purifying or cooling the combustion gas generated by the combustion of the gas generating agent is provided downstream of the combustion gas in the combustion chamber, the wall member is a member mainly for partitioning the combustion chamber. And is provided between the combustion chamber and the filter. At this time, the wall member is formed in a shape having a surface facing the surface exposed to the combustion chamber in the filter or covering the surface. For example, when the inner peripheral surface of the annular filter is exposed to the combustion chamber, the wall member is formed with an annular portion facing the inner peripheral surface of the filter, and has a column shape (or plate shape). When any surface (plane) of the formed filter is exposed to the combustion chamber, the filter is formed with a surface (plane) facing the surface (plane) exposed to the combustion chamber. The wall member thus formed is generally provided between the combustion chamber and the filter.

  In addition, the wall member can be formed and arranged in association with other members or configurations in the housing without being associated with the filter. For example, when another combustion chamber (second combustion chamber) is provided on the downstream side (downstream side of the combustion gas) of the combustion chamber (first combustion chamber) partitioned by the wall member, the wall member Can be formed having a surface that partitions the two combustion chambers. For example, the combustion chamber (first combustion chamber) in which the downstream side of the combustion gas is partitioned by the wall member is cylindrical, and the other combustion chamber (second combustion chamber) is the combustion chamber (first combustion chamber). ) And the concentric circle adjacent to each other, the wall member is formed to have an annular surface that partitions the two combustion chambers. When formed in this way, the combustion gas released from the combustion chamber (first combustion chamber) in which the downstream side of the combustion gas is partitioned by the wall member is another combustion chamber (second chamber) provided next to the combustion gas. Into the combustion chamber).

  Furthermore, the wall member is not a member separately prepared for partitioning the combustion chamber as described above, but a peripheral wall surface in the housing can be used. At this time, the housing constitutes an outer container of the gas generator, and also functions as a wall member that defines a downstream end face of the combustion gas in the combustion chamber, and a gas discharge port provided in the wall member (housing) Corresponds to a gas outlet for releasing the gas for inflating the airbag from the housing. Thus, the gas generator using the housing as the wall member is particularly effective in a gas generator that does not use a filter. A gas generator that does not use such a filter can be realized in a gas generator that uses a gas generating agent that hardly generates a combustion residue as a gas generating agent.

  And this wall member is formed as what has the uneven | corrugated | grooved part which protrudes or is depressed with respect to a combustion chamber, and this uneven | corrugated recess forms a groove | channel or a hollow in the combustion chamber side of a wall member. In the case where a groove is formed on the combustion chamber side of the wall member by the convex and concave portions, the groove can be formed continuously, or can be formed intermittently for each predetermined length. Further, the grooves can be regularly arranged at regular intervals, or can be unevenly distributed or distributed only within a certain range. Further, the extending direction of the groove can be arbitrarily adjusted. When the wall member is formed in an annular shape or a cylindrical shape, in addition to extending in the direction along the axial core extending direction, the circumference of the ring or the cylindrical shape Can be stretched in the direction. When the wall member is formed in a cylindrical shape, the groove formed on the combustion chamber side of the wall member by the convex and concave portions is preferably formed as a groove continuous in the direction along the axial center extending direction of the wall member.

  In addition, when the depression is formed on the combustion chamber side of the wall member by the convex and concave portions, the depression is recessed in a columnar or prismatic shape even if it is recessed in a hemispherical shape toward the outside of the combustion chamber. In addition to providing the depressions regularly at regular intervals, the depressions may be provided randomly or unevenly distributed within a certain range.

  A gas discharge port for discharging the combustion gas generated in the combustion chamber to the outside of the combustion chamber is provided in a groove or a recess formed on the combustion chamber side of the wall member by the convex and concave portions. One or a plurality of gas discharge ports can be formed in the wall member, or one or a plurality of gas discharge ports can be formed for each groove or recess. Such a gas discharge port can be formed as a hole (including a long hole) that opens in a suitable shape, but at least one of the gas discharge ports is in the groove or the depression, and the gas generating agent is present. It is necessary to open the space part that is not. Such gas discharge ports desirably have more than half of the gas discharge ports, and more desirably all of the gas discharge ports open into the space portion. Due to the presence of the space portion, the gas discharge port that opens in the space portion does not come into direct contact with the gas generating agent, and is not blocked by the unburned gas generating agent even during operation of the gas generator. Therefore, the release of the combustion gas (release from the combustion chamber) is not hindered during the operation of the gas generator.

  Such a space portion in which no gas generating agent is present (a space portion in a groove or a recess formed on the combustion chamber side by the concavo-convex portion) burns a groove or a recess having a size or shape into which the gas generating agent does not enter. In addition to adjusting the size and spacing of the concavo-convex portions formed on the wall member so as to be generated on the chamber side, it is always between the gas generating agents that have entered the groove or the recess or between the gas generating agent and the wall member. It can be ensured by adjusting the size and spacing of the concavo-convex portions formed on the wall member so that a groove or depression having a size or shape that causes a gap is formed on the combustion chamber side. That is, the gas generant filled in the combustion chamber is solid, and is generally formed into a lump shape in various shapes such as a pellet shape, a single hole shape, and a cylindrical shape. Therefore, in relation to any dimension of the gas generating agent (any dimension of height, width, length, and diameter depending on the formed shape), the uneven portion formed on the wall member causes the combustion chamber side. This adjusts the size and shape of the grooves or dents formed in the groove.

  Grooves or depressions of a size or shape that does not allow the gas generating agent to enter are the smallest dimensions (height, width, length, diameter, etc.) of one gas generating agent formed in a lump shape. ), The size and interval of the concavo-convex portions formed on the wall member can be adjusted so as to generate a groove or depression having a smaller dimension on the combustion chamber side. Further, it can also be formed by covering the opening portion of the groove or depression formed on the combustion chamber side with a member having a large number of openings with a diameter through which gas generation does not pass, such as a wire mesh.

  In addition, the groove | channel or hollow which a gas generating agent does not enter is a groove | channel or the hollow which does not enter a gas generating agent so that the flow of combustion gas may be inhibited, and it does not necessarily enter any part of a gas generating agent. It need not be a groove or a depression. For example, when the gas generating agent has a protrusion and the protrusion does not interfere with the flow of the combustion gas even if the protrusion enters the groove, the groove or the recess having a size or shape in which the gas generating agent does not enter Such protrusions enter, but the protrusions that do not substantially enter the portion that inhibits the flow of the combustion gas may be formed as grooves or depressions.

  As described above, the gas discharge port is formed in the groove or recess that is adjusted to a size or shape that does not allow the gas generating agent to enter, and the gas discharge port may be in the groove or the recess. For example, it can be formed on either the bottom surface or the wall surface. However, it is desirable that the gas discharge port is formed on the bottom surface of the groove formed by the convex and concave portions. By forming in this way, the interference of the gas generating agent with the gas discharge port can be suppressed, and as a result, the flow of the combustion gas can be ensured.

  In addition, a groove or a recess having a size or a shape in which a gap is always generated between the gas generating agents that have entered or between the gas generating agent and the wall member is any one of the gas generating agents that are formed in a lump shape. Other dimensions than any other dimension (height, width, length, diameter, etc.) or any selected sum of dimensions (for example, height and width, length and diameter) Or it can form by adjusting the magnitude | size, space | interval, etc. of the uneven | corrugated | grooved part formed in the said wall member so that a hollow may be produced in the combustion chamber side. For example, the size (width) W of the groove or recess is larger than n × D, where n is the number of gas generating agents entering the groove and the diameter of the gas generating agent is D, and (n + 1) × D. It can be formed to be smaller. If formed as a groove or a recess having such a size or shape, for example, when n = 1, one gas generating agent enters, but two gas generating agents do not enter, and the groove or the recess. The gas generating agent that cannot enter is supported by the gas generating agent and the edge of the groove or the depression, and as a result, a space portion in which the gas generating agent does not exist is secured in the groove.

  As described above, the gas discharge port is formed in a groove or a recess that is adjusted to a size or shape that always creates a gap between the gas generating agents that have entered or between the gas generating agent and the wall member. Is done. Such a gas discharge port can be formed on either the bottom surface or the wall surface as long as it is in this groove or recess, but at least always a space portion (in this case, the gas generating agents or the gas generating agent and the wall member). It is necessary to be a position where a clearance between the two is secured. That is, the groove or the depression is formed in a size or shape into which at least one gas generating agent enters, but the gas generating agent that enters the groove or the depression is fixed at a specific location in the groove or the depression. It is not. For this reason, the gas generating agent may be present at any position in the groove or indentation, and at least one of the gas discharge ports is formed so as to open to a position where the gas generating agent that has entered cannot exist. There is a need to. The position where the gas generating agent cannot exist is, for example, even when the gas generating agent is stored in the bottom corner of a groove or a recess formed on the combustion chamber side. This corresponds to a groove or a depression that creates a gap.

  In the gas generator for an air bag according to the present invention, in particular, the concavo-convex portion protrudes or is depressed continuously in the axial direction of the housing, and the gas discharge port is formed on the combustion chamber side by the concavo-convex portion. It is desirable that the groove is formed on at least the bottom surface of the groove or recess. Then, the gas generating agent filled in the combustion chamber in which the downstream side of the combustion gas is partitioned by the wall member is upstream of the combustion chamber (upstream side in all gases or flames generated when the gas generator is operated). It is desirable to be ignited by an ignition means existing in For example, when the ignition means is located in the central portion of the combustion chamber, the central portion is the upstream side, and the side where the wall member that defines the combustion chamber is present is the downstream side. When the ignition means is present at one end of the combustion chamber, the opposite end of the combustion chamber or the vicinity thereof corresponds to the downstream side. That is, the ignition means and the gas discharge port are arranged so that the combustion gas flows unilaterally, and smooth combustion can be realized by allowing the gas generating agent to exist between them.

  The convex and concave portions formed on the wall member can be formed by press working. The wall member can be easily formed by pressing.

  The gas generator for an air bag of the present invention configured as described above is an air bag gas generator that can smoothly discharge a gas for inflating the air bag. Moreover, the gas generator for airbags of this invention turns into a gas generator for airbags in which the flow of the gas for inflating an airbag is not obstructed in the inside of the said gas generator. Furthermore, the gas generator for an air bag of the present invention is a gas generator for an air bag using a solid gas generating agent, and a gas discharge port for discharging the gas to the outside of the combustion chamber when the gas generator is operated. The gas generator for an air bag is not blocked by the generating agent.

Embodiment (1)
FIG. 1 is a cut end view in the axial direction of the gas generator for an air bag of the present invention, and FIG. 2 is a cut end view in the radial direction of the inner cylinder 30 shown in FIG. In the gas generator shown in FIG. 1, a diffuser shell 12 having a top plate 12a and a peripheral wall 12b, and a bottom plate 13a and a closure shell 13 forming a peripheral wall 13b are joined together to form a housing 11 as an outer container. A housing space is formed inside. The diffuser shell 12 and the closure shell 13 are joined at a welded portion 14 by a known welding method such as laser welding or electron beam welding, thereby forming one peripheral wall (a combination of the peripheral wall 12b and the peripheral wall 13b).

  The diffuser shell 12 is provided with a required number of gas discharge ports 17 and is closed with an aluminum tape 60 for the purpose of moisture prevention. In FIG. 1, the gas discharge port 17 has a single inner diameter, but those having different diameters can also be used.

  A cylindrical filter 20 is disposed in the housing 11. As the cylindrical filter 20, a flat knitted wire mesh is knitted in multiple layers and compressed in a mold. However, this filter 20 may be one in which a metal mesh is wound in multiple layers by other methods. Further, the filter 20 is not limited to the metal mesh, and any other material or shape can be used as long as it can be used as the filter 20. It may be.

  The cylindrical filter 20 is disposed so as to form a gap 28 between the peripheral wall portions 12 b and 13 b, and the combustion gas passes through the entire area of the cylindrical filter 20 by the gap 28. This improves the filtration and cooling effect of the combustion gas.

  The inner peripheral surface of the filter 20 is supported by a retainer 32 disposed above the top surface 12a of the diffuser shell 12 so that the inner periphery of the retainer 32 is substantially concentric with the housing 11. It is supported by a cylindrical inner cylinder 30.

  The inner cylinder 30 defines a first combustion chamber 35 existing in a space partitioned on the inner side thereof and a second combustion chamber 50 existing on the outer side thereof, and is shown in a cut end view of the inner cylinder in FIG. As shown, convex and concave portions 25 extending along the axial direction are formed at equal intervals in the circumferential direction. And the communicating hole 34 as a gas discharge port is formed in the axial direction at equal intervals in the bottom face of the some groove | channel 27 formed in the 1st combustion chamber 35 side by this convex-concave part 25. FIG. Desirably, the communication hole 34 is formed in a range in which the combustion chambers are partitioned, specifically, in a range in which the first combustion chamber 35 exists inside and the second combustion chamber 50 exists outside.

  In the first combustion chamber 35 partitioned inside the inner cylinder 30, an igniter 40 having an igniting agent serving as an ignition means and a first gas generating agent 36 are accommodated. The second gas generating agent 37 is accommodated. The first gas generating agent 36 is ignited and combusted by the operation of the igniter 40, and the second gas generating agent 37 is ignited and combusted by the flame, and the combustion gas generated by the combustion of the first gas generating agent 36 is inflated to the airbag. It is what is used. That is, in the first combustion chamber 35, the side surface on the downstream side in the flow direction of the combustion gas generated by the combustion of the first gas generating agent 36 filled therein is defined by the inner cylinder 30. Is a wall member in relation to the first combustion chamber 35.

  As described above, the convex recess 25 formed in the inner cylinder 30 has a plurality of grooves 27 extending along the axial direction and recessed in the radial direction on the first combustion chamber 35 side of the inner cylinder 30. In the embodiment shown in this figure, the groove 27 is formed in such a size that the first gas generating agent 36 does not enter. More specifically, the first gas generating agent 36 accommodated in the first combustion chamber 35 is formed in a single-hole cylindrical shape, and its diameter D is shorter than its axial length. Since the groove 27 formed on the combustion chamber 35 side by the convex recess 25 is formed with a width L smaller than the diameter D of the first gas generating agent 36, the first gas generating agent is formed in the groove 27. 36 never enters. The groove 27 formed in this manner is a space portion where the entire gas generating agent 36 does not exist, and all the communication holes 34 open to this space portion.

  In the gas generator in which the first combustion chamber 35 and the second combustion chamber 50 are partitioned by the inner cylinder 30 having the convex and concave portions 25 as described above, the first gas is generated by the flame generated by the operation of the igniter 40. When the agent 36 is ignited and combusted, the flame and combustion gas generated thereby are equally discharged into the second combustion chamber 50 from the communication hole 34 formed in the inner cylinder 30, and the second combustion chamber 50 in the second combustion chamber 50 is discharged. The two-gas generating agent 37 is ignited and burned. Since the flame and combustion gas released from the first combustion chamber 35 are evenly distributed in the second combustion chamber 50, the ignitability of the second gas generating agent 37 filled in the second combustion chamber 50 is improved. Figured. The size and arrangement of the communication holes 34 may not be uniform as long as the ignitability of the second gas generating agent 37 can be improved. For example, the communication holes near the igniter 40 are made smaller, and conversely, the igniter 40 The communication hole at a position far from the center can be enlarged. Further, the communication hole can be unevenly distributed at a position far from the igniter 40 while only the groove is formed. The combustion gas generated in the first combustion chamber 35 and the second combustion chamber 50 is purified and cooled while passing through the filter 20 and is discharged out of the housing 11 from the gas discharge port 17.

  In particular, the inner cylinder 30 that defines the downstream side in the flow direction of the combustion gas in the first combustion chamber 35 has a convex and concave portion 25, and the communication hole 34 that is a gas discharge port is subjected to the first combustion by the convex and concave portion 25. Since the first gas generating agent 36 formed on the chamber 35 side is provided in the groove 27 into which the first gas generating agent 36 does not enter, the combustion gas generated by the combustion of the first gas generating agent 36 is removed even in the initial stage of operation. It can be discharged smoothly. That is, the gas discharge port is formed in the groove 27 where the first gas generating agent 36 does not enter, and the gas discharge port is opened in a space portion where the first gas generating agent 36 does not exist. Even during the initial stage of the operation of the gas generator, the combustion of the first gas generating agent 36 generated in the vicinity of the igniter 40 in the first combustion chamber 35 is transmitted to the vicinity of the gas discharge port (communication hole 34). The gas discharge port is not blocked by the first gas generating agent 36 present in the vicinity thereof, and the gas discharge port maintains a constant opening area. Therefore, even in the initial combustion stage of the first gas generating agent 36 The generated combustion gas can be smoothly discharged out of the combustion chamber 35 from the gas discharge port. For this reason, a situation in which the pressure suddenly increases in the first combustion chamber 35 can be avoided.

  Reference numeral 52 in FIG. 1 is a retainer that adjusts the volume of the second combustion chamber and supports the second gas generating agent, and reference numeral 41 is an igniter collar that fixes the igniter 40 to the gas generator. .

  3 to 5 are radial end views showing other embodiments of the inner cylinder 30 that can be used in the gas generator shown in FIG. In the following FIGS. 3 to 5, those having the same functions as those shown in FIG. 1 or FIG. The diameter D, which is the smallest dimension in the first gas generating agent 36, is always larger than the width L of the groove 27.

The inner cylinder 30 shown in FIG. 3 is different from FIG. 2 in that the formation positions of the gas discharge ports formed in the groove 27 formed on the combustion chamber 35 side by the convex and concave portions 25 are equally spaced on the side surface in the groove 27. Is formed. Also, the inner cylinder 30 shown in FIG. 4 is different from that shown in FIG. 2 in the shape of the groove 27 formed on the combustion chamber 35 side by the convex recess 25, and the cross section is substantially “ It is formed as a groove 27 that is recessed in a “V” shape. In the inner cylinder 30 shown in FIG. 4, communication holes 34 (gas discharge ports) are formed at equal intervals on the wall surface of the groove 27 recessed in a “V” shape. Further, the inner cylinder 30 shown in FIG. 5 is formed with a concave portion 25 that is recessed in a “V” shape toward the inside of the first combustion chamber 35, so that a groove recessed in a substantially trapezoidal cross section is formed in the combustion chamber 35. 27 is formed. The communication hole 34 (gas discharge port) is formed on the side surface of the groove 27 recessed in a substantially trapezoidal shape.
Embodiment (2)
In the gas generator shown in the second embodiment, unlike the first embodiment, the groove 27 formed on the first combustion chamber 35 side by the convex and concave portions 25 of the inner cylinder 30 is larger than the first gas generating agent 36. Is formed. The gas generator shown in the second embodiment is different from the gas generator shown in the first embodiment except that the relationship between the groove 27 formed in the inner cylinder 30 and the first gas generating agent 36 is different from that of the first embodiment. Since, for example, the configuration of the housing 11 and the arrangement of the combustion chambers and the arrangement of the igniter 40 and the filter 20 are the same as those in the first embodiment, the groove 27 formed in the inner cylinder 30 and the second The relationship with the 1 gas generating agent 36 will be described with reference to an enlarged cut end view of the main part of the inner cylinder in FIG.

  As shown in FIG. 6, the inner cylinder is formed with a convex recess 25 that protrudes or is depressed in the radial direction in the axial direction. As a result, a groove is formed on the first combustion chamber 35 side of the inner cylinder. 27 is provided. The width L of the groove 27 is formed such that n pieces of the first gas generating agent 36 enter but not n + 1 pieces. As a result, the first gas generating agent 36 is inserted into the groove 27. A nonexistent space portion (gap S) is present. Then, in any space where the first gas generating agent 36 enters the groove 27 in any state, the combustion gas and flame generated in the first combustion chamber 35 are transferred to the second combustion chamber 35. As a result, at least one of the communication holes 34 (gas discharge port) is always opened in the space portion. The depth d of the groove 27 is set so that 0.5 × d <D, where D is the diameter of the first gas generating agent 36.

  Even in the gas generator thus formed, the combustion of the first gas generating agent 36 generated in the vicinity of the igniter 40 in the first combustion chamber 35 in the initial stage of the operation of the gas generator causes the gas release. Even during the period until it reaches the vicinity of the outlet (communication hole 34), the gas discharge port is not blocked by the first gas generating agent 36 present in the vicinity thereof, and the gas discharge port has a certain opening area. Thus, even in the initial combustion stage of the first gas generating agent 36, the generated combustion gas can be smoothly discharged from the gas discharge port to the outside of the combustion chamber.

The cut end view to the axial direction of the gas generator of this invention. End view of the inner cylinder in the radial direction Radial cut end view showing another aspect of the inner cylinder Radial cutting end view showing still another aspect of the inner cylinder Radial cutting end view showing still another aspect of the inner cylinder Radial cutting end view showing still another aspect of the inner cylinder

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Housing 12 Diffuser shell 13 Closure shell 17 Gas discharge port 20 Filter 25 Convex-concave portion 27 Groove 30 Inner cylinder 32 Retainer 34 Communication hole 35 First combustion chamber 36 First gas generating agent 40 Igniter 50 Second combustion chamber

Claims (5)

A gas generator for an air bag formed using a solid gas generating agent that generates combustion gas,
In the internal space of the housing, which is an outer container of the gas generator, a combustion chamber for storing the gas generating agent is provided,
The downstream end face of the combustion gas in the combustion chamber is partitioned by a wall member having a gas discharge port for discharging the combustion gas,
The wall member has a concavo-convex portion protruding or recessed with respect to the combustion chamber,
The gas discharge port is formed inside a groove or depression formed on the combustion chamber side by the uneven portion,
A gas generator for an air bag, wherein at least one of the gas discharge ports is open in a space portion in which the gas generating agent does not exist in the groove or the depression.   The air bag gas according to claim 1, wherein the space portion is a groove or a depression formed on the combustion chamber side by the uneven portion, which is formed so that the gas generating agent filled in the combustion chamber does not enter. Generator.   2. The air according to claim 1, wherein the space portion is a gap between gas generating agents that have entered a groove or a recess formed on the combustion chamber side by the uneven portion, or a gap between the gas generating agent and a wall member. Gas generator for bags.   The concavo-convex portion protrudes or is depressed continuously in the axial direction of the housing, and the gas discharge port is formed on at least the bottom surface of a groove or dent formed on the combustion chamber side by the concavo-convex portion. The gas generator for airbags as described in any one of Claims 1-3.   5. The airbag according to claim 1, wherein the combustion chamber is provided with two chambers in the housing, and the wall member is a partition wall that partitions any combustion chamber from other combustion chambers. Gas generator.

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