JP7361660B2 - gas generator - Google Patents

Description

The present invention relates to a gas generator incorporated in an airbag device as an occupant protection device mounted on an automobile or the like, and more particularly to a so-called cylinder-type gas generator having an elongated cylindrical outer shape.

As cylinder-type gas generators become smaller, combustion performance is improved by making it easier to load the gas generating agent into the smaller gas generator, and by making it cylindrical and expanding the ignition area. In order to improve the performance, in recent years, a cylindrical gas generating agent that is integrally molded and has an outer diameter close to the inner diameter of the housing is sometimes used (see, for example, Patent Document 1 below).

Japanese Patent Application Publication No. 2000-127887

Here, when configuring a cylinder-type gas generator containing a plurality of tablet-shaped gas generating agents, there is a method of sealing the plurality of gas generating agents and installing them inside the gas generator in an airtight container called a canister. is sometimes used. This airtight container is made of metal such as aluminum, and is designed to rupture upon receiving the flame generated by the igniter of the gas generator, causing the gas generating agent inside to burn. There are various methods for adjusting the performance of the gas generator, but when using the sealed container, the igniter and the sealed container should be separated by a certain distance and placed inside the housing, depending on the igniter's ignition performance, the thickness of the sealed container, etc. It is possible to adjust the space volume by setting the space volume to a predetermined value.

However, when the gas generator of the above-mentioned patent document is provided with a sealed container inside the housing, it can only be configured so that the igniter and the sealed container are in direct contact, and the distance between the igniter and the sealed container is within a predetermined distance. It is not possible to set it to be. Therefore, in the gas generator of the above patent document, when using a sealed container containing a plurality of tablet-shaped gas generating agents, it is difficult to adjust the performance of the gas generator by adjusting the distance between the igniter and the sealed container. Met.

Therefore, the present invention provides a gas generator whose performance can be adjusted more easily than before without increasing the number of parts compared to the past when using a closed container containing a plurality of tablet-shaped gas generating agents. The purpose is to

(1) The gas generator of the present invention includes a first cylindrical member loaded with a gas generating agent that generates gas by combustion and closed at both ends, and a filter through which the gas passes. an elongated cylindrical housing in which a gas ejection port for ejecting the gas is formed at a position corresponding to the filter; and a cup-shaped member containing an igniter; the cup-shaped member is connected to the housing. A part of the igniter is fitted with an igniter that is disposed facing one end of the first cylindrical member on one end side in the axial direction and is capable of igniting and burning the gas generating agent. a holder having a fitting part that is fixed to one end of the housing in the axial direction, and reducing the diameter of a position of the housing that corresponds to at least a part of the cup-shaped member; While bringing the inner wall of the housing into contact with the outer wall of the cup-shaped member, gradually move the housing from a predetermined location on the tip end side of the cup-shaped member to a predetermined midway portion on the first cylindrical member side. A tapered portion whose diameter increases is formed, and the outer diameter of the first cylindrical member is larger than the outer diameter of the cup-shaped member, and the end of the first cylindrical member on the igniter side The portion is characterized in that the portion is in contact with the tapered portion.

(2) In the gas generator of (1) above, an inclined portion having a diameter larger than the tip portion of the cup-shaped member is formed on the side opposite to the tip portion of the cup-shaped member; It is preferable that a peripheral wall that contacts the inclined part is formed in a part of the housing, and that the igniter is held between the peripheral wall and the fitting part.

(3) In the gas generator of (1) or (2) above, the filter is provided in the first cylindrical member, and the outer diameter of the first cylindrical member is equal to It is preferable that the inner diameter is substantially the same as that of the inner diameter of the inner diameter.

(4) As another point of view, in the gas generator of (1) or (2) above, the filter is sealed within a second cylindrical member, and the outer diameter of the second cylindrical member is , may be approximately the same as the inner diameter of the housing.

(5) In the gas generators of (1) to (4) above, the filter is formed in a hollow cylindrical shape having a cylindrical hollow part, and the hollow part is further loaded with a gas generating agent. It is preferable that the

(6) In the gas generators of (1) to (5) above, it is preferable that the predetermined location is a location of the housing that corresponds to the position of the tip of the cup-shaped member.

According to the present invention, when using a closed container containing a plurality of tablet-shaped gas generating agents, there is provided a gas generator whose performance can be adjusted more easily than before without increasing the number of parts compared to before. be able to.

1 is a schematic diagram (partially omitted) showing the internal structure of the gas generator according to the first embodiment of the present invention, partially shown in cross section. 2 is a partially enlarged sectional view of FIG. 1. FIG. 2 is a partially enlarged sectional view of FIG. 1. FIG. FIG. 2 is a diagram for explaining a part of the process of storing contents in a container in the gas generator of FIG. 1. FIG. FIG. 2 is a diagram for explaining a part of the process of storing contents in a container in the gas generator of FIG. 1. FIG. It is a schematic diagram (partially omitted) which shows the internal structure of the gas generator based on 2nd Embodiment of this invention, showing a part in cross section.

<First embodiment>
The internal structure of a cylinder-type gas generator according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

(Configuration of gas generator 100)
The gas generator 100 has a long, generally cylindrical outer shape, and includes a housing 10, a holder 20 attached to one open end of the housing 10, and a holder 20 that closes the other open end of the housing 10. and a closing member 12 attached to the other end of the housing 10.

The housing 10 is an elongated cylindrical member having peripheral walls 10a, 10b, 10c, 10d, and 10e and openings at both ends in the axial direction. The closing member 12 is a disc-shaped member having a predetermined thickness, and has an annular groove 13 on its circumferential surface for fixing by caulking (an example of a diameter reduction method), which will be described later. The annular groove 13 for caulking and fixing is formed on the circumferential surface of the closing member 12 so as to extend in the circumferential direction. Further, a gas outlet 11 is provided in the peripheral wall near the end of the housing 10 on the side where the closing member 12 is attached. The gas ejection ports 11 are holes for ejecting gas generated inside the gas generator 100 to the outside, and a plurality of gas ejection ports 11 are provided along the circumferential direction and the axial direction of the housing 10.

The closing member 12 is made of metal such as stainless steel, iron steel, aluminum alloy, or stainless alloy, and is a disc-shaped member having a predetermined thickness. As shown in FIGS. 1 and 2, a part of the closing member 12 is inserted into one open end of the housing 10, and it corresponds to the annular groove 13 provided on the circumferential surface of the closing member 12. The closing member 12 is caulked and fixed to the housing 10 by contracting the circumferential wall 10a of the housing 10 in the radially inward portion (caulking) and engaging the annular groove 13.

The holder 20 is made of metal such as stainless steel, iron steel, aluminum alloy, or stainless alloy, and as shown in FIG. 23, an annular groove portion 22 for caulking and fixing formed on the outer circumferential surface so as to extend in the circumferential direction, and a female connector ( (not shown) into which a fitting part 21 can be fitted. Note that by contracting the peripheral wall 10e of the housing 10 in a portion corresponding to the annular groove 22 provided on the outer peripheral surface of the holder 20 radially inward (caulking) and engaging the annular groove 22, the housing 10 The holder 20 is fixed by caulking.

Note that, as described above, a female connector is attached to the fitting portion 21 of the holder 20. This female connector is a part to which a male connector of a harness that transmits a signal from a collision detection means provided separately from the gas generator 100 is connected. A retainer (not shown) is attached to the female connector. This retainer is installed to prevent the cylinder-type gas generator 100 from malfunctioning due to electrostatic discharge, etc. when the gas generator 100 is transported, and is attached to the harness during the assembly stage to the airbag device. When the male connector is inserted into the female connector, its contact with the terminal pins 52 is released.

As shown in FIGS. 1 and 3, an igniter 50 serving as a means for igniting the gas generating agent 31 is disposed at one end of the housing 10 in the axial direction (that is, a portion closer to the holder 20). Note that the igniter 50 and the holder 20 that fixes the igniter 50 have a function as an ignition means for generating a flame for burning granular gas generating agent 31, which will be described later.

As shown in FIGS. 1 and 3, the igniter 50 is inserted and held in the fitting portion 23 of the holder 20. As shown in FIGS. More specifically, the igniter 50 includes a base frame through which a pair of terminal pins 52 are inserted and held, and a squib cup 51 (cup-shaped member) attached to the base frame. A resistor (bridge wire) is attached to connect the tips of the terminal pins 52 inserted into the squib cup 51, and ignition powder is filled in the squib cup 51 so as to surround or contact the resistor. There is. Nichrome wire or the like is generally used as the resistor, and ZPP (zirconium/potassium perchlorate), ZWPP (zirconium/tungsten/potassium perchlorate), lead tricinate, etc. are generally used as the igniter. Note that the squib cup 51 may be filled with not only the igniter but also a transfer charge, but transfer charges that can be placed together with the ignition charge include metals/oxidizing agents such as boron/potassium nitrate, etc. A composition consisting of titanium hydride/potassium perchlorate, a composition consisting of boron/5-aminotetrazole/potassium nitrate/molybdenum trioxide, etc. are used.

When a collision is detected, a predetermined amount of current flows through the resistor through the terminal pin 52. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and upon receiving this heat, the ignition powder starts to burn. The high temperature flame generated by the combustion ruptures the squib cup 51 containing the igniter. The time from when current flows through the resistor until the igniter 50 is activated is 2 milliseconds or less when a nichrome wire is used as the resistor.

In addition, the squib cup 51 includes a cylindrical portion 51a, an inclined portion 51b that continuously increases in diameter halfway from the end of the cylindrical portion 51a, and a diameter that decreases in a direction intersecting the inclination direction of the inclined portion 51b. It is generally made of metal or resin. Note that by reducing the diameter of the peripheral wall 10c of the housing 10 in the portion corresponding to the cylindrical portion 51a inward in the radial direction (caulking) to form a cylindrical shape that matches the shape of the outer periphery of the cylindrical portion 51a, The cylindrical portion 51a is fixed to the housing 10 by caulking. Thereby, the peripheral wall 10c can serve as a directional member for directing the flame emitted from the tip of the igniter 50 toward the gas generating agent 31 side. Further, the circumferential wall 10b of the housing 10 is formed in a shape whose diameter gradually decreases from the middle of the housing 10 to the circumferential wall 10c. Thereby, the peripheral wall 10b can position the end of the container 34 (first cylindrical member), which will be described later, within the housing 10. Further, the peripheral wall 10d of the housing 10 is formed in a tapered shape whose diameter increases along the outer shape of the inclined portion 51b from the peripheral wall 10c to the middle of the housing 10. As a result, the igniter 50 can be fixed to the housing 10 and the holder 20 by sandwiching the inclined parts 51b and 51c between the inner wall of the peripheral wall 10d and the fitting part 23.

As shown in FIG. 1, a cylindrical container 34 in which a gas generating agent 31, a filter 41, and the like are sealed is loaded in the internal space of the housing 10. Preferably, the container 34 is made of metal such as aluminum.

The container 34 has a bottomed cylindrical part 34a and a lid part 34b, and contains a gas generating agent 31, a coiled spring 35, a filter 41, an AI agent 32, and a cover member 33. It is arranged. Note that the lid portion 34b and the tip of the igniter 50 are spaced apart from each other by a predetermined distance. This makes it easier for the squib cup 51 to split when the igniter 50 is activated.

The gas generating agent 31 is an integrally molded product that is ignited by a flame generated by the igniter 50 and burns to generate gas. Further, the gas generating agent 31 is generally formed as a molded body containing a fuel, an oxidizing agent, and an additive. As the fuel, for example, triazole derivatives, tetrazole derivatives, guanidine derivatives, azodicarbonamide derivatives, hydrazine derivatives, etc., or combinations thereof are used. Specifically, for example, nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole, etc. are preferably used. Examples of oxidizing agents include basic metal hydroxides such as basic copper nitrate and basic copper carbonate, perchlorates such as ammonium perchlorate and potassium perchlorate, alkali metals, and alkaline earth metals. Nitrates containing cations selected from , transition metals, and ammonia are used. As the nitrate, for example, sodium nitrate, potassium nitrate, etc. are preferably used. Further, examples of the additive include a binder, a slag forming agent, a combustion modifier, and the like. As the binder, for example, cellulose derivatives such as hydroxypropylene methyl cellulose, metal salts of carboxymethyl cellulose, organic binders such as stearate, and inorganic binders such as synthetic hydroxytalcite and acid clay can be suitably used. As the slag forming agent, silicon nitride, silica, acid clay, etc. can be suitably used. Further, as the combustion modifier, metal oxides, ferrosilicon, activated carbon, graphite, etc. can be suitably used.

As shown in FIGS. 1 and 3, the coiled spring 35 is formed by spirally winding so that its overall appearance resembles a truncated cone shape. Further, the coiled spring 35 has one end in contact with the lid part 34b and the other spirally formed end in contact with the gas generating agent 31 to apply an elastic force to the gas generating agent 31. It is set up to do so. Due to this bias, the gas generating agent 31 is fixed in the container 34 by being sandwiched between the coiled spring 35, the end of the filter 41 on the coiled spring 35 side, and the bottom of the bottomed cylindrical portion 34a. Ru. Moreover, the coiled spring 35 has a truncated conical shape as a whole extending from the igniter 50 side to the gas generating agent 31 side, thereby making it easier to direct the flame emitted from the igniter 50 toward the gas generating agent 31 side. be able to.

The filter 41 is made of a cylindrical member having a substantially cylindrical hollow part 41a at the center, and the gas generating agent 31 is charged in the hollow part 41a. The AI agent 32 has an auto-ignition (AI) function to automatically ignite without the operation of the igniter 50. Furthermore, a cover member 33 that holds the AI agent 32 is hermetically housed between the filter 41 and the bottom of the container 34 on the closing member 12 side. Note that the cover member 33 is provided with a plurality of holes.

Note that by using the filter 41 made of the above-mentioned cylindrical member, the flow resistance of the working gas flowing during operation can be suppressed to a low level, and efficient gas flow is possible. The filter 41 is made of, for example, a wire rod made of metal such as stainless steel or iron steel, or a wire rod made of metal such as stainless steel or iron, or a wire rod wound around a net material, or a wire rod made of a wire rod made of a metal such as stainless steel or steel, or a wire rod made of a wire rod, or a wire rod made of a wire rod made of a metal such as stainless steel or iron steel, or a wire rod made of a wire rod, a wire rod made of a metal such as stainless steel or iron, or a wire rod made of a wire wound around a wire rod, or a wire rod made of a wire rod made of a metal such as stainless steel or steel, or a wire rod made of a wire rod, a wire rod made of a metal such as stainless steel, or a wire rod made of a mesh material, or a wire rod formed by winding a net material, or a wire rod made of a metal such as stainless steel or steel, or a wire rod made of a wire material, or a wire rod formed by winding a mesh material, or a wire material pressed by pressing, is used. Specifically, stockinette-knitted wire mesh, plain-woven wire mesh, or an assembly of crimp-woven metal wires is used. The filter 41 functions as a cooling means for cooling the gas by removing high-temperature heat contained in the gas when the gas generated in the container 34 passes through the filter 41. It also functions as a removal means for removing slag and the like. Here, as a modification of the filter 41, a filter having a maze-like flow path formed by combining substantially cylindrical or mortar-shaped parts made of metal may be used. Thereby, the course of the working gas can be changed in various directions, so that it is possible to cool the gas and remove slag.

In addition, in the embodiment of the present invention described above, a filter made of so-called knitted wire mesh was used as an example, but instead of this, a filter made by winding punched metal was used. It is also possible to use one made by winding expanded metal. Here, punched metal is a metal plate in which only an opening is provided in a plate-shaped metal member (that is, no protrusion is provided around the periphery of the opening), and expanded metal is a metal plate in which only an opening is provided in a plate-shaped metal member. It is a metal plate that is made into a mesh-like shape by making openings in the plate-shaped metal member by making cuts in a staggered pattern and pushing them apart. Even when such punched metal or expanded metal is used in place of the stockinette knitted wire mesh described above, the same effects as those described in the embodiments of the present invention described above can be obtained.

In addition, in the above-mentioned punched metal and expanded metal, a filter made of a laminate is constructed by winding a single metal plate member, but the configuration of the filter is limited to this configuration. isn't it. In other words, each layer may be composed of a separate metal plate-like member, and by combining these, a filter consisting of a laminate may be constructed, or a part of multiple layers may be composed of a single metal plate member. The remaining layer is formed by winding another single metal plate-like member, and these layers are combined to form a filter consisting of a laminate. Good too.

Since the AI agent 32 having an AI function automatically ignites at a lower temperature than the gas generating agent 31, in the event that a fire or the like occurs in a vehicle equipped with an airbag device or the like in which the gas generator 100 is incorporated, It is possible to prevent abnormal operation of the gas generator 100 due to external heating.

Here, the process of accommodating objects in the container 34 will be explained using FIGS. 4 and 5. First, as shown in FIG. 4(a), the AI agent 32 and the cover member 33 are placed in a bottomed cylindrical shape so that the AI agent 32 is held in the cover member 33 and the bottom of the bottomed cylindrical portion 34a. It is arranged at the bottom of the section 34a. Next, as shown in FIG. 4B, after the bottomed cylindrical portion 34a is turned upside down from the state shown in FIG. 4A, the filter 41 is disposed in contact with the cover member 33. Subsequently, as shown in FIG. 5(a), the gas generating agent 31 is loaded into the bottomed cylindrical portion 34a so that the hollow portion 41a of the filter 41 is also filled. Then, as shown in FIG. 5(b), the coiled spring 35 is loaded into the bottomed cylindrical portion 34a so that the lower end of the coiled spring 35 is in contact with the upper part of the group of gas generating agents 31. Finally, as shown in FIG. 5(c), the top end of the coiled spring 35 is pressed into the bottomed cylindrical part 34a by the bottom of the lid 34b, and the inner circumferential wall 34b1 of the lid 34b is pressed. After the opening end of the bottomed cylindrical portion 34a is sandwiched between the folded flange portion 34b2 and the flange portion 34b2, the opening of the bottomed cylindrical portion 34a is closed by caulking and fixing from the outside of the flange portion 34b2. It is closed by the portion 34b. Through these series of steps, storage of the contents in the container 34 is completed.

In this way, by forming the container 34 in which the gas generating agent 31, the coiled spring 35, the filter 41, the AI agent 32, and the cover member 33 are housed in advance, the work of assembling the gas generator 100 into the housing 10 is simplified. The manufacturing process can be simplified compared to the conventional method. In addition, there is no need for a partition member that separates the combustion chamber, filter chamber, etc., and there is no need to provide a separate seal member just for sealing (occluding) the gas jet port 11, so gas generation is reduced compared to conventional methods. It is possible to reduce the number of parts for the entire device. Moreover, since the gas generating agent 31 can be filled up to the hollow part 41a of the filter 41 at once, manufacturing is easy.

Next, the operation of the gas generator 100 described above during operation will be described. When a vehicle equipped with an airbag device incorporating the gas generator 100 according to the present embodiment collides, the collision is detected by collision detection means separately provided in the vehicle, and based on this, the igniter 50 is activated. When the igniter 50 is activated, the pressure inside the igniter 50 increases due to the combustion of the igniter, which causes the tip of the squib cup 51 of the igniter 50 to rupture, and flames flow from the tip of the squib cup 51 of the igniter 50 to the inside of the housing 10. The liquid flows out to the container 34 side.

The flame that has flowed in this way ruptures the lid 34b of the container 34, and further ignites and burns the gas generating agent 31 inside the container 34, thereby generating a large amount of gas. The combustion of the gas generating agent 31 increases the pressure inside the container 34, and the generated gas passes through the filter 41 and cleaves the portion of the container 34 that is in contact with the gas outlet 11. Further, when the portion of the container 34 that is in contact with the gas outlet 11 ruptures, the generated gas is ejected from the gas outlet 11 to the outside of the gas generator 100. The generated gas is cooled to a predetermined temperature. Then, the gas ejected from the gas ejection port 11 is guided into the inside of the airbag and inflates and deploys the airbag.

(Main features of gas generator 100)
According to this embodiment, the peripheral wall 10b is formed into a tapered shape with a starting end at a location corresponding to the position of the tip of the squib cup 51 in the housing 10. Therefore, according to this embodiment, one end of the container 34 can be positioned within the housing 10. That is, when using the container 34 containing a plurality of tablet-shaped gas generating agents 31, the distance between the igniter 50 and the container 34 can be adjusted to a predetermined distance without increasing the number of parts compared to the conventional method. . As a result, according to this embodiment, it is possible to provide gas generator 100 whose performance can be adjusted more easily than before.

Further, in the present embodiment, the circumferential wall 10d of the housing 10 is formed in a shape whose diameter increases from the circumferential wall 10c to the middle of the housing 10 along the outer shape of the inclined portion 51b. Further, a tapered fitting portion 23 into which the inclined portion 51c of the igniter 50 fits is formed. As a result, the igniter 50 can be fixed to the housing 10 and the holder 20 by sandwiching the inclined parts 51b and 51c between the inner wall of the peripheral wall 10d and the fitting part 23 fixed to the housing 10. That is, according to the present embodiment, the igniter 50 is attached to the housing 10 by the inner wall of the peripheral wall 10d and the fitting part 23, without forming the fitting part 23 of the holder 20 into a complicated shape as in the conventional case. Since it can be fixed to the holder 20, the weight and cost can be reduced compared to the conventional case.

Further, in this embodiment, the container 34 itself is used as a closing member (sealing member) for the gas jet port 11, and when the pressure inside the container 34 rises above a predetermined level, the gas jet of the container 34 is It is configured to cleave the portion that is in contact with the outlet 11. Further, a filter 41, a gas generating agent 31, an AI agent 32, etc. are sealed in the container 34. Therefore, according to this embodiment, oxidation of the filter 41 can be prevented. Furthermore, since the gas generating agent 31 is accommodated in the hollow portion 41a within the filter 41, the dead space can be reduced compared to the conventional method, and there is no change in the volume of the space in which the gas generating agent 31 burns. The combustion performance of the gas generating agent 31 can be stabilized.

Further, in this embodiment, since the peripheral wall 10c is formed to cover the periphery of the cylindrical portion 51a of the squib cup 51, the direction of the flame when the igniter 50 is activated can be directed toward the container 34. can.

<Second embodiment>
Next, a second embodiment of the present invention will be described using FIG. 6. Note that in this embodiment, the parts having the same symbols up to the last two digits as in the first embodiment are the same as the parts in the first embodiment, so the explanation may be omitted. Further, in this embodiment, portions that are not particularly explained are the same as those in the first embodiment, so the explanation may be omitted.

The gas generator 200 according to the present embodiment includes, instead of the container 34, (1) the container 134 in which the coiled spring 135 and the gas generating agent 131 are stored, and (2) the gas generating agent 131 in the hollow part 141a. This embodiment differs from the first embodiment in that a container 140 that accommodates a filter 141, an AI agent 132, and a cover member 133 is used.

Note that the container 134 includes a bottomed cylindrical portion 134a shorter than the bottomed cylindrical portion 34a in the first embodiment, and a lid portion 134b similar to the lid portion 34b in the first embodiment. There is. Therefore, the shape of the end of the container 134 on the igniter 151 side is similar to the shape of the end of the container 34 of the first embodiment on the igniter 51 side. Further, the container 140 is a cylindrical member whose outer circumferential wall faces all of the gas jet ports 111 and has an outer diameter that is approximately the same as the inner diameter of the housing 110, and both ends of the cylindrical member are closed. It is a member made by

In this way, by manufacturing the container 134 and the container 140 separately, the container 134 and the container 140 may have different shapes and types of gas generating agents ( (Of course, they may be of the same shape or type). Further, the containers 140 may be made differently depending on the filter performance (cooling performance, residue removal performance, etc.) or the type of gas generating agent. By appropriately combining these, gas generators with various performances can be easily changed at the manufacturing stage of the gas generator 200.

Next, the operation of the gas generator 200 described above during operation will be described. When a vehicle equipped with an airbag device incorporating the gas generator 200 according to the present embodiment collides, the collision is detected by collision detection means separately provided in the vehicle, and based on this, the igniter 150 is activated. When the igniter 150 is activated, the pressure inside the igniter 150 increases due to combustion of the igniter, which causes the tip of the squib cup 151 of the igniter 150 to rupture, and flames flow from the tip of the squib cup 151 of the igniter 150 to the inside of the housing 110. The water flows out to the container 134 side.

The flame that has flowed in this way ruptures the lid 134b of the container 134, and further ignites and burns the gas generating agent 131 in the container 134, thereby generating a large amount of gas. The combustion of the gas generating agent 131 increases the pressure within the container 134, and the bottomed cylindrical portion 134a ruptures. Thereafter, the gas whose pressure has been increased due to the pressure increase in the container 134 further cleaves the end of the container 140 on the container 134 side, and the gas flows into the container 140. The gas flowing into the container 140 also ignites and burns the gas generating agent 131 in the hollow part 141a of the container 140, thereby generating further gas. At this time, the pressure within the container 140 increases, and the generated gas passes through the filter 141 and ruptures the portion of the container 140 that is in contact with the gas outlet 111 . Furthermore, when the portion of the container 140 that is in contact with the gas outlet 111 ruptures, the generated gas is ejected from the gas outlet 111 to the outside of the gas generator 200. The generated gas is cooled to a predetermined temperature. Then, the gas ejected from the gas ejection port 111 is guided into the inside of the airbag and inflates and deploys the airbag.

According to this embodiment, the same effects as in the first embodiment can be achieved. Moreover, by separating the container 134 and the container 140, the contents (gas generating agent, filter, etc.) contained in the container 134 and the container 140 can be varied depending on the performance desired to be achieved with the gas generator 200, for example. It is possible to easily manufacture a gas generator 200 that can be changed into various combinations.

Although the embodiments of the present invention have been described above based on the drawings, it should be understood that the specific configuration is not limited to these embodiments. The scope of the present invention is indicated by the claims rather than the description of the embodiments described above, and includes all changes within the meaning and range equivalent to the claims.

For example, the performance of the gas generator 100 can be adjusted by changing the internal volume of the housing 10 near the igniter 50 depending on the shape of the peripheral walls 10b, 10c, and 10d of the housing 10.

Furthermore, although the method for reducing the diameter of the housing 10 has been described using caulking as an example, any processing method that can reduce the diameter of the housing 10 may be used.

10, 110 Housing 10a, 10b, 10c, 10d, 10e, 110a, 110b, 110c, 110d, 110e Peripheral wall 11, 111 Gas outlet 12, 112 Closing member 13, 113 Annular groove portion 20, 120 Holder 21, 121 Fitting portion 22, 122 Annular groove portion 23, 123 Fitting portion 31, 131 Gas generating agent 32, 132 AI agent 33, 133 Cover member 34, 134, 140 Container 34a, 134a Bottomed cylindrical portion 34b, 134b Lid portion 35, 135 Coiled springs 41, 141 Filters 41a, 141a Hollow portions 50, 150 Igniters 51, 151 Squib cup 51a Cylindrical portions 51b, 51c Inclined portions 52, 152 Terminal pins 100, 200 Gas generator

Claims (6)

A first cylindrical member loaded with a gas generating agent that generates gas by combustion and closed at both ends; and a filter through which the gas passes; an elongated cylindrical housing in which a gas outlet for ejecting gas is formed;
a cup-shaped member containing an igniter, the cup-shaped member being disposed opposite to one end of the first cylindrical member on one end side of the housing in the axial direction, and igniting the gas generating agent; An igniter that can cause combustion;
a holder having a fitting part into which a part of the igniter fits and is fixed to one axial end of the housing;
Equipped with
A portion of the housing corresponding to at least a portion of the cup-shaped member is diameter-reduced to bring the inner wall of the housing into contact with the outer wall of the cup-shaped member, and the tip of the cup-shaped member of the housing is A tapered portion is formed that gradually increases in diameter from a predetermined location on the side to a predetermined midway portion on the first cylindrical member side,
The outer diameter of the first cylindrical member is larger than the outer diameter of the cup-shaped member,
A gas generator, wherein an end of the first cylindrical member on the igniter side is in contact with the tapered portion. An inclined portion having a diameter larger than the tip portion of the cup-shaped member is formed on the side opposite to the tip portion of the cup-shaped member,
A peripheral wall that contacts the inclined portion is formed in a part of the housing,
The gas generator according to claim 1, wherein the igniter is held between the peripheral wall and the fitting portion. The filter is provided within the first cylindrical member,
The gas generator according to claim 1 or 2, wherein an outer diameter of the first cylindrical member is approximately the same as an inner diameter of the housing. the filter is sealed within a second cylindrical member;
The gas generator according to claim 1 or 2, wherein an outer diameter of the second cylindrical member is approximately the same as an inner diameter of the housing. The filter is formed in a hollow cylindrical shape having a cylindrical hollow part,
The gas generator according to any one of claims 1 to 4, wherein the hollow portion is further loaded with a gas generating agent. Any one of claims 1 to 5, wherein the predetermined location on the tip end side of the cup-shaped member in the housing is a location corresponding to the position of the tip end of the cup-shaped member in the housing. The gas generator described in section.

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