WO2022138285A1

WO2022138285A1 - Gas generator

Info

Publication number: WO2022138285A1
Application number: PCT/JP2021/045837
Authority: WO
Inventors: 雅基平岡; 春樹滝澤
Original assignee: 日本化薬株式会社
Priority date: 2020-12-21
Filing date: 2021-12-13
Publication date: 2022-06-30
Also published as: JPWO2022138285A1

Abstract

[Problem] To obtain a gas generator in which cost is reduced by lessening weight and simplifying components to a greter extent than in the prior art. [Solution] This gas generator 100 includes: a housing 10 having an elongated and substantially columnar outer shape; a holder 20 attached to one open end of the housing 10; an igniter 50 held by the holder 20 and igniting a gas generation agent 31; a sealing member 12 attached to the other end of the housing 10 so as to seal the other open end of the housing 10; and a filter 41. The sealing member 12: has an annular groove 13 formed by swaging and thereby reducing the diameter of the circumferential surface of a bottomed cylindrical member having a prescribed thickness; and is formed in a substantially jar-shaped configuration that has an interior space 12a.

Description

Gas generator

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 specifically, to a so-called cylinder type gas generator having a long cylindrical shape.

In a cylinder-type gas generator, a long cylindrical housing is generally configured such that one end is closed by a closing member and the other end is closed by a holder having an ignition portion (for example, the following patent). See Document 1).

Japanese Patent No. 5455932

However, for gas generators represented by the above patent documents, cost reduction by further weight reduction and simplification of parts is desired.

Therefore, an object of the present invention is to provide a gas generator in which the weight is reduced and the cost is reduced by simplifying the parts as compared with the conventional case.

(1) The gas generator of the present invention is loaded with a gas generator that generates gas by burning, contains a filter through which the gas passes, and ejects the gas to a position corresponding to the filter. A long cylindrical housing in which a spout is formed, an igniter capable of igniting and burning the gas generating agent, and a part of the igniter are held at one end in the axial direction of the housing. It includes a holder fixed and a closing member fixed to the other end in the axial direction of the housing, and the closing member is inserted halfway from the other end of the housing into the inside of the housing. It is characterized in that the side surface of the bottom tubular member is deformed together with the housing and fixed to the housing by reducing the diameter at at least one place from the outside together with the housing. The term "reducing the diameter at one place" here means, for example, reducing the diameter of one of the side surfaces of the housing in an annular shape around the circumference of the side surface of the housing.

(2) In the gas generator of (1) above, it is preferable that the closing member uses the deformed internal space of the bottomed tubular member as a space for reducing the internal pressure when gas is generated. ..

(3) In the gas generator according to (1) or (2), the bottomed cylindrical member is formed by reducing the diameter of the side surface of the end portion of the bottomed tubular member together with the housing from the outside. It is preferably fixed to the housing.

(4) In the gas generators (1) to (3) above, the bottomed cylindrical member includes a first cylindrical portion disposed on the end side of the housing and the first tubular portion. It has a second cylindrical portion having a larger diameter than the above, and a connecting portion connecting the first tubular portion and the second tubular portion, and at least one place where the diameter reduction processing is performed is performed. , It is preferable that the connection portion is located on the side of the first cylindrical portion.

(5) In the gas generators (1) to (4) above, it is preferable that the diameter reduction processing is performed at two or more places.

(6) In the gas generator of the above (5), when the diameter reduction processing is performed at two or more places, the inner wall of the housing and the closing member are located between adjacent positions of the diameter reduction processing. It is preferable that a gap is formed between the outer wall and the outer wall.

(7) In the gas generator of the above (6), it is preferable that the gap is formed by reducing the diameter of the adjacent positions to be reduced in the same step.

According to the present invention, it is possible to provide a gas generator in which the weight is reduced and the cost is reduced by simplifying the parts as compared with the conventional case.

It is a schematic diagram (partially omitted) which shows the internal structure of the gas generator which concerns on 1st Embodiment of this invention which a part is shown in the cross section. It is a schematic diagram (partially omitted) which shows the internal structure of the gas generator which concerns on the 2nd Embodiment of this invention which a part is shown in the cross section. It is a schematic diagram (partially omitted) which shows the internal structure of the gas generator which concerns on 3rd Embodiment of this invention which a part is shown in the cross section. It is a schematic diagram (partially omitted) which shows the internal structure of the gas generator which concerns on 4th Embodiment of this invention which a part is shown in the cross section. It is a schematic diagram (partially omitted) which shows the internal structure of the gas generator which concerns on 5th Embodiment of this invention which a part is shown in the cross section. (A) is a cross-sectional view (partially omitted) for explaining the diameter reduction processing of the gas generator of FIG. 5, and (b) and (c) are cross-sectional views (partially omitted) showing a modification of (a). Is. FIG. 5 is an enlarged cross-sectional view showing an end portion of the gas generator of FIG.

<First Embodiment>
Hereinafter, the internal structure of the cylinder type gas generator according to the embodiment of the present invention will be described with reference to FIG.

(Structure of gas generator 100)
The gas generator 100 has a long substantially columnar outer shape, and closes the housing 10, the holder 20 attached to one open end of the housing 10, and the other open end of the housing 10. Includes a closing member 12 attached to the other end of the housing 10.

The housing 10 is made of a long cylindrical member having

peripheral walls

10a and 10e and having openings at both ends in the axial direction. The closing member 12 has an annular groove portion 13 formed by reducing the diameter of the peripheral surface of a bottomed cylindrical member having a predetermined thickness by fixing by caulking (an example of a diameter reduction processing method) described later, and has an internal space. It is formed in a substantially pot shape having 12a. The annular groove portion 13 formed by the caulking fixing is formed so as to extend in the circumferential direction on the peripheral surface of the closing member 12. Further, a gas outlet 11 is provided on the peripheral wall near the end on the side where the closing member 12 of the housing 10 is attached. The gas ejection port 11 is a hole for ejecting the gas generated inside the gas generator 100 to the outside, and is provided in plurality along the circumferential direction and the axial direction of the housing 10.

Further, the closing member 12 is made of metal such as stainless steel, steel, aluminum alloy, or stainless alloy. Then, as shown in FIG. 1, with a part of the closing member 12 inserted in one open end of the housing 10, the peripheral wall of the housing 10 corresponding to a part of the peripheral surface of the closing member 12. By reducing (caulking) the diameter of 10a inward in the radial direction to form the annular groove portion 13, the closing member 12 is caulked and fixed to the housing 10.

The holder 20 is made of a metal such as stainless steel, steel, aluminum alloy, or stainless alloy, and has a tapered fitting portion 23 to which the igniter 50 is fitted, and the holder 20 extends in the circumferential direction to the outer peripheral surface. An annular groove 22 for fixing the caulking formed, and a fitting portion 21 to which a female connector (not shown) for energizing the igniter 50 can be fitted on the side opposite to the holding position of the igniter 50. have. The peripheral wall 10e of the housing 10 in the portion corresponding to the annular groove portion 22 provided on the outer peripheral surface of the holder 20 is reduced in diameter (caulked) inward in the radial direction to engage with the annular groove portion 22. The holder 20 is caulked and fixed to the holder 20.

As described above, a female connector is formed in the fitting portion 21 of the holder 20. This female connector is a portion to which the male connector of the harness that transmits a signal from the collision detecting means provided separately from the gas generator 100 is connected. A retainer (not shown) is attached to the female connector. This retainer is attached to prevent the cylinder type gas generator 100 from malfunctioning due to electrostatic discharge or the like during transportation of the gas generator 100, and is a harness at the stage of assembling to the airbag device. By inserting the male connector into the female connector, the contact with the terminal pin 52 is released.

As shown in FIG. 1, an igniter 50 as an ignition means for the gas generating agent 31 is arranged at one end in the axial direction of the housing 10 (that is, a portion closer to the holder 20). The holder 20 for fixing the igniter 50 and the igniter 50 has a function as an ignition means for generating a flame for burning the granular gas generating agent 31, which will be described later.

As shown in FIG. 1, the igniter 50 is held together with a substantially cylindrical member 53, which will be described later, in a state of being inserted into the fitting portion 23 of the holder 20. 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) mounted on the base frame, and is inside the squib cup 51. A resistor (bridge wire) is attached so as to connect the tip of the terminal pin 52 inserted into the squib cup 51, and the squib cup 51 is filled with an igniter 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 styphnate or the like is generally used as the igniter. The squib cup 51 may be further filled with a igniting agent as well as an igniting agent, but the igniting agent that can be placed at the same time as the igniting agent is a metal / oxidizing agent typified by boron / potassium nitrate or the like. , A composition composed of titanium hydride / potassium perchlorate, a composition composed of boron / 5-aminotetrazole / potassium nitrate / molybdenum trioxide, or the like is 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 the igniter starts combustion in response to this heat. The high temperature flame generated by the combustion causes the squib cup 51 containing the igniter to explode. The time from when a current flows through the resistor until the igniter 50 operates is 2 milliseconds or less when a nichrome wire is used for the resistor.

Further, the squib cup 51 is generally made of metal or resin. The substantially cylindrical member 53 that covers the peripheral wall portion of the squib cup 51 other than the vicinity of the tip portion is caulked and fixed to the holder 20 by the caulking portion 24 together with the igniter 50. Here, the substantially cylindrical member 53 is a directional member that directs the direction of the flame generated in the igniter 50 toward the accommodator 34 during operation. Further, a winding spring 54 is provided around the squib cup 51 and the substantially tubular member 53 along the inner wall of the housing 10. One end of the winding spring 54 is in contact with the end of the lid 34b of the container 34, which will be described later, and the other end is in contact with the inner end of the holder 20.

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

The container 34 has a bottomed cylindrical portion 34a and a lid portion 34b, and a gas generating agent 31, a winding spring 35, an AI agent 32, and a cover member 33 are disposed therein. There is. The lid portion 34b and the tip portion of the igniter 50 are arranged apart from each other so as to have a predetermined distance. This makes it easier for the squib cup 51 to open when the igniter 50 operates.

The gas generating agent 31 is an integrally molded product that is ignited by a flame generated by being ignited by the igniter 50 and generates gas by burning. 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, a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, or a combination thereof is used. Specifically, for example, nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole and the like are preferably used. Examples of the oxidizing agent include basic metal nitrates such as basic copper nitrate, basic metal carbonates such as basic copper carbonate, perchlorates such as ammonium perchlorate or potassium perchlorate, and alkali metals. , Alkaline earth metals, transition metals, nitrates containing cations selected from ammonia, etc. are used. As the nitrate, for example, sodium nitrate, potassium nitrate and the like are preferably used. In addition, examples of the additive include a binder, a slag forming agent, a combustion adjusting agent, and the like. As the binder, for example, a cellulose derivative such as hydroxypropylene methyl cellulose, a metal salt of carboxymethyl cellulose, an organic binder such as stearate, synthetic hydroxytalcite, and an inorganic binder such as acidic clay can be preferably used. As the slag forming agent, silicon nitride, silica, acidic white clay and the like can be preferably used. Further, as the combustion adjusting agent, metal oxide, ferrosilicon, activated carbon, graphite and the like can be preferably used.

As shown in FIG. 1, the winding spring 35 is formed by spirally winding so as to resemble a conical trapezoidal shape as a whole. Further, one end of the winding spring 35 is in contact with the lid portion 34b, and the other end portion formed in a spiral shape is in contact with the gas generating agent 31 to urge the gas generating agent 31 with an elastic force. It is provided to do so. By this urging, the gas generating agent 31 is fixed so as to be sandwiched between the winding spring 35, the end portion of the filter 41 on the winding spring 35 side, and the bottom portion of the bottomed tubular portion 34a in the container 34. To. Further, the winding spring 35 has a conical trapezoidal shape from the igniter 50 side to the gas generator 31 side as a whole, so that the direction of the flame emitted from the igniter 50 can be easily directed to the gas generator 31 side. be able to.

The AI agent 32 has an auto-ignition (AI) function that automatically ignites regardless of the operation of the igniter 50. More specifically, since the AI agent 32 automatically ignites at a lower temperature than the gas generator 31, a fire or the like should occur in a vehicle or the like equipped with an airbag device or the like in which the gas generator 100 is incorporated. In this case, it is possible to prevent the induction of abnormal operation of the gas generator 100 by being heated from the outside. Further, a cover member 33 for holding the AI agent 32 is hermetically housed at the bottom of the container 34 on the closing member 12 side. The cover member 33 is provided with a plurality of holes.

The filter 41 is made of a cylindrical member having a substantially cylindrical hollow portion 41a in the center. By using the filter 41 made of the above-mentioned cylindrical member, the flow resistance of the working gas that flows during operation is suppressed to a low level, and efficient gas flow is possible. As the filter 41, for example, a wire rod made of a metal such as stainless steel or steel, a wire rod wound with a net material, or a filter 41 compacted by press working is used. Specifically, a knitted wire mesh, a plain weave wire mesh, an aggregate of crimp-woven metal wires, or the like is used. The filter 41 functions as a cooling means for cooling the gas by taking away the high-temperature heat of the gas when the gas generated in the container 34 passes through the filter 41, and is contained in the gas. It also functions as a removing means for removing slag and the like. Here, as a modification of the filter 41, a filter having a labyrinth-like flow path formed by combining substantially cylindrical or mortar-shaped parts made of metal may be used. As a result, the course of the working gas can be changed in various directions, so that the gas can be cooled and the slag can be removed.

Further, in the above-described embodiment of the present invention, a case where a filter made of a so-called knitted wire mesh is used as an example is illustrated, but instead of this, a filter made by winding a punching metal is used. It is also possible to use the one manufactured by winding the expanded metal. Here, the punching metal is a metal plate in which only an opening is provided in the plate-shaped metal member (that is, no protrusion is provided on the peripheral edge of the opening), and the expanded metal is, for example, in the plate-shaped metal member. It is a metal plate in which an opening is provided in the plate-shaped metal member to form a mesh by making staggered cuts and expanding the cuts. Even when such a punching metal or an expanded metal is used in place of the above-mentioned knitted wire mesh, the same effect as that described in the above-described embodiment of the present invention can be obtained.

Further, in the punching metal and the expanded metal described above, a filter made of a laminated body is formed by winding a single metal plate-shaped member, but the structure of the filter is limited to the said structure. is not. That is, each layer may be composed of separate metal plate-shaped members and combined to form a filter composed of a laminated body, or a part of the plurality of layers may be made of a single metal. The remaining layer is formed by winding another single metal plate-shaped member, and these are combined to form a filter made of a laminated body. May be good.

Further, between the filter 41 and the container 34, a bottomed cylindrical bypass prevention member 36 that partitions the housing 10 in the axial direction is provided. The bypass prevention member 36 has a through hole 36a through which the generated gas can pass in a substantially central portion of the bottom portion. Further, the bypass prevention member 36 is arranged so as to cover the end portion of the bottomed tubular portion 34a of the container 34 on the filter 41 side and its surroundings, and the outer peripheral wall portion abuts on the inner wall of the housing 10. .. As a result, the generated gas can be bypassed from between the inner wall of the housing 10 and the outer peripheral portion of the filter 41 so as not to leak to the gas outlet 11. That is, the bypass prevention member 36 can allow the gas generated on the container 34 side to flow into the filter 41 side through the through hole 36a.

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

The flame flowing in this way cleaves the lid portion 34b of the container 34, and further ignites and burns the gas generating agent 31 in the container 34 to generate a large amount of gas. The combustion of the gas generating agent 31 raises the pressure in the container 34, and the generated gas cleaves the end of the container 34 on the closing member 12 side and passes through the through hole 36a of the bypass prevention member 36. It flows into the hollow portion 41a and the internal space 12a. After that, the generated gas is ejected from the gas outlet 11 to the outside of the gas generator 100 via the filter 41, but since it passes through the filter 41, the generated gas reaches a predetermined temperature. It will be cooled. Then, the gas ejected from the gas outlet 11 is guided to the inside of the airbag to expand and expand the airbag.

(Main features of gas generator 100)
According to the present embodiment, it is an object of the present invention to provide a gas generator 100 which can be made lighter than the conventional closing member and whose cost is reduced by simplifying parts.

Further, in the present embodiment, since the closing member 12 and the housing 10 are crimped together, the crimping position is not particularly limited as long as the closing member 12 can be fixed to the housing 10. Therefore, it is not necessary to manage the caulking position (accurate positioning, etc.) as in the conventional case, and the manufacturing process can be simplified.

Further, in the present embodiment, since the closing member 12 is provided with the internal space 12a, the space volume can be increased as compared with the case of using the conventional closing member, and the internal pressure at the time of gas generation can be reduced. It becomes.

<Second Embodiment>
Next, the second embodiment of the present invention will be described with reference to FIG. In this embodiment, the parts having the same reference numerals up to the last two digits as those of the first embodiment are the same as the parts of the first embodiment, and thus the description may be omitted. Further, in the present embodiment, the parts not particularly described are the same as those in the first embodiment, and therefore the description and illustration may be omitted.

The gas generator 200 according to the present embodiment is formed so that the bottom portion thereof is substantially the same as the end portion of the housing 210 instead of the closing member 12 whose bottom portion protrudes from the end portion of the housing 10 in the first embodiment. It differs from the first embodiment in that the closing member 212 is used.

The closing member 212 is formed so that the bottom portion thereof is substantially at the same position as the end portion of the housing 210, but the side surface portion 212b is longer in the axial direction than the closing member 12 of the first embodiment. An internal space 212a having a sufficient space volume is formed.

According to the present embodiment, the same action and effect as those of the first embodiment can be obtained. Further, since the closing member 212 is formed so that the bottom portion thereof is substantially at the same position as the end portion of the housing 210, it is possible to secure an internal space 212a having a sufficient space volume. As a result, it is possible to increase the space volume as compared with the case of using the conventional closing member while making the total length in the axial direction equal to or shorter than the conventional one, and it is possible to reduce the internal pressure when gas is generated.

<Third Embodiment>
Next, the third embodiment of the present invention will be described with reference to FIG. In this embodiment, the parts having the same reference numerals up to the last two digits as those of the first embodiment are the same as the parts of the first embodiment, and thus the description may be omitted. Further, in the present embodiment, the parts not particularly described are the same as those in the first embodiment, and therefore the description and illustration may be omitted.

The gas generator 300 has a long, substantially columnar outer shape, so as to close the housing 310, the holder 320 attached to one open end of the housing 310, and the other open end of the housing 310. Includes a closing member 312 attached to the other end of the housing 310.

The housing 310 is made of a long cylindrical member having

peripheral walls

310a, 310b, 310c, 310d, 310e and having openings at both ends in the axial direction. The closing member 312 has an annular groove portion 313 formed by reducing the diameter of the peripheral surface of a bottomed cylindrical member having a predetermined thickness by caulking and fixing, and is formed in a substantially pot shape having an internal space 312a. ing. The annular groove portion 313 formed by this caulking fixing is formed so as to extend in the circumferential direction on the peripheral surface of the closing member 312. Further, a gas outlet 311 is provided on the peripheral wall near the end on the side where the closing member 312 of the housing 310 is attached. The gas ejection port 311 is a hole for ejecting the gas generated inside the gas generator 300 to the outside, and is provided in plurality along the circumferential direction and the axial direction of the housing 310.

The igniter 350 is held in a state of being inserted into the fitting portion 323 of the holder 320.

Further, by reducing the diameter of the peripheral wall 310c of the housing 310 corresponding to the squib cup 351 of the igniter 350 inward in the radial direction (caulking), the squib cup 351 is formed into a cylindrical shape that matches the outer peripheral shape of the squib cup 351. , The squib cup 351 is caulked and fixed to the housing 310. Thereby, the peripheral wall 310c can serve as a directional member for directing the direction of the flame emitted from the tip end portion of the igniter 350 toward the gas generating agent 331 side. Further, the peripheral wall 310b in the housing 310 is formed in a shape in which the diameter is gradually reduced from the middle of the housing 310 to the peripheral wall 310c. As a result, the peripheral wall 310b can be positioned in the housing 310 at the end of the container 334 described later. Further, the peripheral wall 310d in the housing 310 is formed in a tapered shape whose diameter is expanded along the outer shape of the squib cup 351 from the peripheral wall 310c to the middle of the housing 310. As a result, the squib cup 351 can be sandwiched between the inner wall of the peripheral wall 310d and the fitting portion 323, and the igniter 350 can be fixed to the housing 310 and the holder 320.

The internal space of the housing 310 is loaded with a cylindrical container 334 in which a gas generating agent 331, a filter 341 and the like are sealed. The container 334 is preferably made of a metal such as aluminum.

The container 334 has a bottomed cylindrical portion 334a and a lid portion 334b, and inside, a gas generating agent 331, a winding spring 335, a filter 341, an AI agent 332, and a cover member 333 are provided. It is arranged. The lid portion 334b and the tip portion of the igniter 350 are arranged apart from each other so as to have a predetermined distance. This makes it easier for the squib cup 351 to cleave when the igniter 350 is activated.

The filter 341 is made of a cylindrical member having a substantially cylindrical hollow portion 341a in the center, and the gas generating agent 331 is loaded in the hollow portion 341a. The AI agent 332 has an auto-ignition (AI) function that automatically ignites regardless of the operation of the igniter 350. Further, a cover member 333 for holding the AI agent 332 is hermetically housed between the filter 341 and the bottom of the container 334 on the closing member 312 side. The cover member 333 is provided with a plurality of holes.

Next, the operation of the gas generator 300 described above during operation will be described. When a vehicle equipped with an airbag device incorporating a gas generator 300 in the present embodiment collides, the collision is detected by a collision detecting means separately provided in the vehicle, and the igniter 350 is based on this. Works. When the igniter 350 is activated, the pressure inside the igniter 350 rises due to the combustion of the igniter, which causes the tip of the squib cup 351 of the igniter 350 to burst, and the flame from the tip of the squib cup 351 of the igniter 350 to the inside of the housing 310. It flows out to the container 334 side of.

The flame flowing in this way cleaves the lid portion 334b of the container 334, and further ignites and burns the gas generating agent 331 in the container 334 to generate a large amount of gas. Due to the combustion of the gas generating agent 331, the pressure inside the container 334 rises, and the generated gas cleaves the end portion of the container 334 on the closing member 312 side and flows into the internal space 312a. After that, the generated gas cleaves the portion in contact with the gas outlet 311 of the container 334 via the filter 341. Further, when the portion of the accommodator 334 in contact with the gas outlet 311 is cleaved, the generated gas is ejected from the gas outlet 311 to the outside of the gas generator 300, but the filter 341 The generated gas is cooled to a predetermined temperature. Then, the gas ejected from the gas outlet 311 is guided to the inside of the airbag to expand and expand the airbag.

According to the present embodiment, the same action and effect as those of the first embodiment can be obtained.

<Fourth Embodiment>
Next, the fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the parts having the same reference numerals up to the last two digits as those of the first or third embodiment are the same as the parts of the first or third embodiment, and thus the description may be omitted. Further, in the present embodiment, the parts not particularly described are the same as those in the first or third embodiment, and therefore the description and illustration may be omitted.

In the gas generator 400 according to the present embodiment, instead of the closing member 412 whose bottom portion protrudes from the end portion of the housing 310 in the third embodiment, the closing member 412 having a bottom portion slightly protruding from the end portion of the housing 410 is provided. It differs from the third embodiment in that it is used.

The bottom of the closing member 412 protrudes slightly from the end of the housing 410, but the side surface portion 412b is longer in the axial direction than the closing member 312 of the third embodiment, which is sufficient. An internal space 412a having a space volume is formed.

According to the present embodiment, the same action and effect as those of the first embodiment can be obtained. Further, since the bottom portion of the closing member 412 protrudes slightly from the end portion of the housing 410, it is possible to secure an internal space 412a having a sufficient space volume while keeping the overall length in the axial direction equal to that of the conventional one. As a result, it is possible to increase the space volume as compared with the case of using the conventional closing member while making the total length in the axial direction the same as that of the conventional one, and it is possible to reduce the internal pressure at the time of gas generation.

<Fifth Embodiment>
Next, the fifth embodiment of the present invention will be described with reference to FIGS. 5 to 7. In the present embodiment, the parts having the same reference numerals up to the last two digits as those of the first embodiment are the same as the parts of the first embodiment unless otherwise specified, and thus the description may be omitted. Further, in the present embodiment, the parts not particularly described are the same as those in the first embodiment, and therefore the description and illustration may be omitted.

The gas generator 500 according to the present embodiment has (1) two diameter reduction processes for fixing the closing member 512 to the end of the housing 510, and (2) the winding spring 535 is the igniter 550. It is arranged so that one end abuts on the tip side (flame injection side), and is formed in a spiral shape that expands in diameter from one end side to the other end side, so that the gas generator 531 is prevented from bypassing on the other end side. It is mainly different from the first embodiment in that it is pressed against the member 536 and (3) there is no container. By providing a plurality of diameter reduction processing (caulking) as in (1) above, the effect of preventing the closing member 512 from coming off when gas is generated is enhanced, so that the amount of deformation of the housing 510 due to diameter reduction processing (caulking) can be reduced. It can be made smaller, and thus the effect of preventing the housing 510 from breaking can be enhanced.

As shown in FIG. 6A, the closing member 512 is shrunk in the direction of the arrow after the precursor 512A of the closing member 512, which is a bottomed tubular member, is arranged at the end of the precursor 510A of the housing. As shown in FIGS. 5 and 7, by performing diameter processing (caulking, etc.) at two locations at the same time (including the case where two locations are processed at the same time in the same process even if they are not at the same time) or one location at a time. By forming the

peripheral walls

510a and 510b and the

annular groove portions

513 and 514, the closing member 512 is fixed to the housing 510. Further, it is preferable that an annular gap 515 is formed between the inner wall of the housing 510 and the outer wall of the closing member 512 between the

annular grooves

513 and 514. By forming the gap 515, the stress due to the caulking process can be dispersed, and the housing 510 can be prevented from breaking due to the

peripheral walls

510a and 510b or the

annular groove portions

513 and 514. That is, for example, if the gap 515 is formed, the housing 510 and / and the closing member 512 can be prevented from breaking even if the thickness of the housing 510 and / or the closing member 512 is reduced as compared with the case where the gap 515 is not formed. Is possible.

Here, as a modification of the precursor 512A, the

precursors

612A and 712A of the blocking member as shown in FIGS. 6 (b) and 6 (c) may be used. The precursor 612A has a bottomed short cylindrical first tubular portion 612a arranged on the end side of the housing precursor 610A and a tubular second cylinder having a diameter larger than that of the first tubular portion 612a. It has a shaped portion 612b and a connecting portion 612c connecting the first cylindrical portion 612a and the second tubular portion 612b. The connecting portion 612c is a tubular member whose diameter is expanded from the first cylindrical portion 612a side to the second tubular portion 612b side. The connecting portion 612c may be any as long as it connects the first cylindrical portion 612a and the second tubular portion 612b. For example, the connecting portion 612c has a disk shape and the precursor 612A is used. It may be formed in a stepped shape. The precursor 712A has a bottomed cylindrical first tubular portion 712a arranged on the end side of the housing precursor 710A and a short tubular second cylinder having a diameter larger than that of the first tubular portion 712a. It has a shaped portion 712b and a connecting portion 712c connecting the first cylindrical portion 712a and the second tubular portion 712b. The connecting portion 712c is a tubular member whose diameter is expanded from the first cylindrical portion 712a side to the second tubular portion 712b side. The connecting portion 712c may be any as long as it connects the first cylindrical portion 712a and the second tubular portion 712b. For example, the connecting portion 712c has a disk shape and the precursor 712A is used. It may be formed in a stepped shape. When the

precursors

612A and 712A of these modifications are used, diameter reduction processing is easy. Further, a connecting portion 612c forming a step between the first tubular portion 612a and the second tubular portion 612b, and a connecting portion 712c forming a step between the first tubular portion 712a and the second tubular portion 712b are provided. As a result, the diameter-reduced portion (caulking) is formed by reducing the diameter of the arrow portion on the upper stage side of the arrow in FIG. 6 (b) and the arrow portion on the lower stage side of the arrow in FIG. 6 (c). The portion) has a shape along the connecting portion 612c and the connecting portion 712c, and the holding force between the closing member (bottomed cylindrical member) and the housing is higher than in the case where the above-mentioned closing member 512 is adopted. That is, when the

precursors

612A and 712A are used instead of the precursor 512A, it is possible to further prevent the closing member (bottomed tubular member) from coming off when the gas generator is operated.

The winding spring 535 is configured so that the end on the gas generating agent 531 side forms a spiral flat surface, and also serves as a base on which the AI agent 532 is attached. The bypass prevention member 536 is fixed to the housing 510 via the welded portion 510c.

The first holder 520 is a substantially tubular member made of resin, and has an annular groove portion 522 on the outer periphery thereof. The first holder 520 is fixed to the housing 510 by performing diameter reduction processing (caulking processing or the like) from the outer peripheral side of the housing 510 to the inner side at a position corresponding to the annular groove portion 522 to form a peripheral wall 510e.

The second holder 525 is a substantially tubular member made of metal, and a part of the igniter 550 (mainly the main body part) is inserted inside, and a part of the outside is inserted into the first holder 520. Has been done. The igniter 550 is caulked and fixed to the second holder 525 by the caulking portion 524. Further, the second holder 525 is fixed to the housing 510 by sandwiching the second holder 525 between the first holder 520 and the third holder 555 and forming the peripheral walls 510d and 510e described later.

The third holder 555 is a substantially tubular member made of resin, and has an annular groove portion 556 on the outer periphery thereof. The third holder 555 is fixed to the housing 510 by performing diameter reduction processing (caulking processing or the like) from the outer peripheral side of the housing 510 to the inner side at the position corresponding to the annular groove portion 556 to form the peripheral wall 510d. Further, a part of the igniter 550 (mainly a squib cup 551) and a caulking portion 524 are inserted in the third holder 555. Further, the third holder 555 is a directional member that directs the direction of the flame generated in the igniter 550 during operation toward the gas generating agent 531 side.

The igniter 550 is held and fixed to the housing 510 by these first holder 520, second holder 525, and third holder 555.

According to the present embodiment, not only can the same action and effect as those of the first embodiment be obtained, but also the closing member 512 can be further prevented from coming off during operation.

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

For example, in the first to fourth embodiments, the gas generator may not be provided with an accommodator. Further, in the third embodiment and the fourth embodiment, the gas generating agent may not be filled in the hollow portion of the filter. Further, in the fifth embodiment, the bypass member may be eliminated so that the hollow portion of the filter is filled with the gas generating agent.

Further, in the first to fifth embodiments, the method of reducing the diameter of the housing has been described by taking caulking as an example, but any processing method that can reduce the diameter of the housing may be used.

10, 210, 310, 410, 510 Housing 10a, 10e, 210a, 310a, 310b, 310c, 310d, 310e, 410a, 510a, 510b, 510d, 510e Circumferential wall 11, 211, 411, 411, 511 Gas outlet 12, 212, 312, 412, 512 Closing member 12a, 212a, 312a, 412a, 512a Internal space 13, 22, 213, 313, 322, 413, 513, 514, 522, 556 Circular groove 20, 320 Holder 21, 23, 321 , 323, 521, 523 Fitting part 31, 331, 431, 331 Gas generator 32, 332, 532 AI agent 33, 333 Cover member 34, 334, 434 Incubator 34a, 334a, 434a Bottomed tubular part 34b, 334b Cover 35, 54, 335, 535 Wind spring 36, 536 Bypass prevention member 41, 241, 341, 441, 541 Filter 41a, 241a, 341a, 441a, 541a Hollow part 50, 350, 550 Ignition machine 51, 351 551 Squib cup 52, 352, 552 Terminal pin 53 Approximately tubular member 100, 200, 300, 400, 500 Gas generator 212b, 412b Side surface 510A, 512A, 610A, 612A, 710A, 712A Precursor 515 Gap 520 1st Holder 525 2nd holder 555 3rd holder 612a, 712a 1st tubular part 612b, 712b 2nd tubular part 612c, 712c Joining part

Claims

A long cylindrical shape in which a gas generator that generates gas by combustion is loaded, a filter through which the gas passes is contained, and a gas outlet for ejecting the gas is formed at a position corresponding to the filter. Housing and
An igniter capable of igniting and burning the gas generating agent,
A holder in which a part of the igniter is held and fixed to one end of the housing in the axial direction.
The closing member fixed to the other end of the housing in the axial direction,
Equipped with
The closing member is deformed together with the housing by reducing the diameter of the side surface of the bottomed cylindrical member halfway inserted into the inside of the housing from the other end of the housing at at least one place from the outside together with the housing. A gas generator characterized in that it is fixed to the housing.
The gas generator according to claim 1, wherein the closing member is a space for reducing the internal pressure when gas is generated, in which the internal space of the bottomed tubular member after deformation is used.
Claim 1 or 2, wherein the bottomed tubular member is fixed to the housing by reducing the diameter of the side surface of the end portion of the bottomed tubular member together with the housing from the outside. The gas generator described.
The bottomed tubular member includes a first cylindrical portion arranged on the end side of the housing, a second tubular portion having a diameter larger than that of the first tubular portion, and the first tubular portion. And a connecting portion for connecting the second cylindrical portion.
The gas generator according to any one of claims 1 to 3, wherein at least one place where the diameter reduction processing is performed is a position on the first tubular portion side of the connection portion.
The gas generator according to any one of claims 1 to 4, wherein the diameter reduction processing is performed at two or more places.
When the diameter reduction processing is performed at two or more places, it is determined that a gap is formed between the adjacent diameter reduction processing positions and between the inner wall of the housing and the outer wall of the closing member. The gas generator according to claim 5, wherein the gas generator is characterized.
The gas generator according to claim 6, wherein the gap is formed by reducing the diameter of adjacent positions to be reduced in diameter in the same process.