JP6399959B2 - Gas generator - Google Patents

Description

  The present invention relates to a gas generator incorporated in an airbag device as an occupant protection device installed in an automobile or the like, and more particularly to a gas generator having a long cylindrical outer shape.

  2. Description of the Related Art Conventionally, airbag devices, which are occupant protection devices, have been widely used from the viewpoint of protecting occupants such as automobiles. The airbag device is equipped for the purpose of protecting an occupant from an impact generated when a vehicle or the like collides, and the airbag is inflated and deployed instantaneously when the vehicle or the like collides, so that the occupant's body is deployed. It is something that catches. The gas generator is a device that is incorporated in the airbag device and inflates and deploys the airbag by instantaneously generating gas when a vehicle or the like collides.

  Gas generators of various configurations exist based on specifications such as installation positions and outputs with respect to vehicles and the like. One of them is a so-called cylinder type gas generator. The cylinder type gas generator has a long cylindrical shape, and is suitably incorporated in a side airbag device, a passenger side airbag device, a curtain airbag device, a knee airbag device, a seat cushion airbag device, and the like. .

  Usually, in a cylinder-type gas generator, an igniter is installed at one end of the housing in the axial direction, and a combustion chamber containing a gas generating agent is provided in the central portion of the housing in the axial direction. A filter chamber containing a filter is provided at the other end, and a gas outlet is provided in a peripheral wall portion of the housing that defines the filter chamber. In the cylinder type gas generator configured in this way, in general, gas generated in the combustion chamber flows into the filter chamber to pass through the inside of the filter, and the gas after passing through the filter passes through the gas outlet. Will be ejected to the outside. As a gas generator having a long cylindrical outer shape, there is a so-called T-shaped gas generator other than the cylinder type gas generator.

  Here, as a cylinder type gas generator capable of improving the cooling efficiency of the gas generated in the combustion chamber, there is one disclosed in JP-A-11-245760 (Patent Document 1). In the cylinder type gas generator disclosed in Patent Document 1, the flow path is configured so that the gas generated in the combustion chamber is once blown to the peripheral wall portion of the housing before flowing into the filter chamber. Is.

  Specifically, in the cylinder type gas generator disclosed in Patent Document 1, a partition member that partitions the space inside the long, substantially cylindrical housing in the axial direction is provided inside the housing, and the partition member A wire mesh screen is installed coaxially with the housing in the space closer to the igniter, and a filter is installed in a space opposite to the side where the igniter is located when viewed from the partition member. The gas generating agent is accommodated in the portion located on the igniter side in the space inside the screen, and the cup-shaped member is installed in the portion located on the filter side in the space inside the screen. Has been.

  With the configuration described above, the high-temperature gas generated by the combustion of the gas generating agent once moves toward the outside in the radial direction of the housing, passes through the screen, and is sprayed on the inner peripheral surface of the housing. Then, it flows into the inside of the cup-shaped member via the communication hole provided in the cup-shaped member, and then flows into the filter via the communication hole provided in the partition member. Therefore, since the high-temperature gas generated in the combustion chamber is cooled by the housing having a relatively low temperature outside the screen before reaching the filter, the cooling efficiency of the gas is improved. .

  In addition, the flow path is configured so that the gas generated in the combustion chamber is once blown to the peripheral wall portion of the housing before being ejected to the outside of the housing, and the gas after being blown to the peripheral wall portion is configured. As a cylinder-type gas generator that eliminates the need for installing a filter by further complicating the flow path, there is one disclosed in, for example, JP-T-2008-546513 (Patent Document 2).

  In the cylinder type gas generator disclosed in Patent Document 2, the axial end of the housing on the side where the gas outlet is provided has a shape that is narrowed to a smaller diameter than other parts, The internal space is partitioned in a radial direction by a cylindrical partition member, and a partition portion is provided so as to separate the interior of the partition member in the axial direction. Among the spaces partitioned by the partition portion, an igniter is A gas generating agent is accommodated in the installed space, and a hollow cylindrical member is installed in the space facing the gas outlet provided in the housing.

  In the cylinder type gas generator configured as described above, the high-temperature gas generated by the combustion of the gas generating agent is once directed outwardly in the radial direction of the housing through the communication hole provided in the partition member. To the space facing the gas jetting port among the spaces partitioned by the partition wall through the other communication holes provided in the partition member. It flows into the gas jet port through a labyrinth channel formed by installing the cylindrical member in the space. Therefore, the high-temperature gas generated in the combustion chamber is cooled by the housing having a relatively low temperature outside the partition member, so that the gas cooling efficiency is improved and the labyrinth flow described above is achieved. By further passing through the path, further improvement of the gas cooling efficiency is achieved, thereby eliminating the need for a filter.

Japanese Patent Laid-Open No. 11-245760 Special table 2008-546513 gazette

  In the gas generator configured so that the gas flow direction is changed a plurality of times as disclosed in Patent Documents 1 and 2, the internal structure is naturally complicated. A large number of parts are required to define the flow path. Therefore, there is a problem that the assembling work at the time of manufacture becomes complicated, and it is required to reduce the number of parts as much as possible.

  In order to ensure that the gas generated in the combustion chamber passes through the intended flow path and is ejected to the outside during operation, an unintended gap is not generated between the components. It is necessary to fully consider the positioning of parts and the assembly structure during assembly.

  Furthermore, when the shape of each part becomes complicated, the cost of the gas generator increases, resulting in an increase in the manufacturing cost of the gas generator. Therefore, the shape of each part is also simplified. It is necessary to.

  In the gas generators disclosed in Patent Documents 1 and 2 described above, there is room for further improvement in these respects, and a simple configuration is sufficiently realized to the extent that assembly is easy. Not necessarily.

  Accordingly, the present invention has been made in view of the above-described problems, and provides a gas generator that is sufficiently simplified in structure to such an extent that efficient gas cooling is possible and assembly is easy. The purpose is to do.

  A gas generator according to the present invention includes an elongated cylindrical housing closed at one end and the other end in an axial direction, and an inner space that divides a space inside the housing into an inner space and an outer space in a radial direction. A first portion that is located inside the inner cylinder portion and that divides the inner space into a combustion chamber located on the one end side of the housing and a decompression chamber located on the other end side of the housing. The partition portion is located outside the inner cylinder portion, and the outer space is partitioned into a gas passage chamber located on the one end side of the housing and a gas discharge chamber located on the other end side of the housing. A second partition, an igniter assembled to the one end of the housing so as to face the combustion chamber, and a gas generating agent accommodated in the combustion chamber. The first partition portion is disposed closer to the one end portion of the housing than the second partition portion. The inner cylinder portion has a first communication hole for communicating the combustion chamber and the gas passage chamber in order from the one end portion side to the other end portion side of the housing along the axial direction of the housing. A first cylindrical part provided with a second cylindrical part provided with a second communication hole for communicating the gas passage chamber and the decompression chamber, the decompression chamber and the gas discharge chamber. And a third tubular portion provided with a third communication hole for communication. A gas outlet for ejecting gas toward the outside of the housing is provided in a peripheral wall portion of the housing at a portion defining the gas discharge chamber. The second partition portion and the third cylindrical portion are configured by a first cylindrical member that has a large diameter portion and a small diameter portion and is a single member in which the large diameter portion and the small diameter portion are integrated. The first cylindrical member further includes an annular step portion positioned between the large diameter portion that is the second partition portion and the small diameter portion that is the third cylindrical portion. In the gas generator according to the present invention, an axial end portion of the first cylindrical member located on the other end side of the housing is in contact with the other end portion of the housing, and the large diameter The first cylindrical member is assembled to the housing by the outer peripheral surface of the portion being brought into contact with the inner peripheral surface of the peripheral wall portion of the housing, and the housing of the second cylindrical portion is The second cylindrical portion is assembled to the first cylindrical member by inserting an axial end located on the other end side into the large diameter portion and coming into contact with the annular stepped portion. ing.

  In the gas generator according to the present invention, the axial end portion of the second cylindrical portion located on the other end side of the housing increases in diameter toward the other end side of the housing. You may be comprised by the enlarged diameter part to do.

  In the gas generator according to the present invention, the contact portion between the second cylindrical portion and the first cylindrical member includes an inclined portion whose diameter decreases toward the other end portion of the housing. You may go out.

  In the gas generator according to the present invention, the first cylindrical part and the second cylindrical part are constituted by a second cylindrical member which is a single member, and the first The partition part may be comprised by the separate member inserted in the said 2nd cylinder member different from the said 1st cylinder member and the said 2nd cylinder member.

  In the gas generator according to the present invention, the first cylindrical portion and the second cylindrical portion are constituted by different members separated from each other, and the first partition portion is You may be comprised by a part of member which comprises the said 1st cylindrical part, and / or a part of member which comprises the said 2nd cylindrical part.

  In the gas generator according to the present invention, in the axial direction of the housing, the portion corresponding to the space inside the second cylindrical portion of the decompression chamber faces the second communication hole. A solid rod portion extending along the axis may be provided.

  In the gas generator according to the present invention, a wound body of a metal wire may be extrapolated to the rod portion.

  In the gas generator according to the present invention, the third communication hole and the gas outlet may be provided at a position that does not face in the radial direction of the housing.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the gas generator which the structure was simplified enough to the extent which can cool efficiently and can be assembled easily.

It is the schematic of the cylinder type gas generator in Embodiment 1 of this invention. It is an expanded sectional view of the igniter vicinity of the cylinder type gas generator shown in FIG. It is an expanded sectional view of the gas outlet vicinity of the cylinder type gas generator shown in FIG. It is the figure which represented typically the flow of the gas at the time of the action | operation of the cylinder type gas generator shown in FIG. It is the schematic of the gas jet nozzle vicinity of the cylinder type gas generator in Embodiment 2 of this invention. It is the schematic of the gas jet nozzle vicinity of the cylinder type gas generator in Embodiment 3 of this invention. It is the schematic of the gas jet nozzle vicinity of the cylinder type gas generator in Embodiment 4 of this invention. It is an enlarged view of the area | region VIII shown in FIG. It is the schematic of the gas jet nozzle vicinity of the cylinder type gas generator in Embodiment 5 of this invention. FIG. 10 is an enlarged view of a region X shown in FIG. 9. It is the schematic of the gas jet nozzle vicinity of the cylinder type gas generator in Embodiment 6 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment described below exemplifies a case where the present invention is applied to a cylinder type gas generator incorporated in a side airbag device. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic diagram of a cylinder type gas generator according to Embodiment 1 of the present invention. 2 and 3 are an enlarged sectional view in the vicinity of the igniter and an enlarged sectional view in the vicinity of the gas outlet of the cylinder type gas generator shown in FIG. 1, respectively. First, with reference to these FIG. 1 thru | or FIG. 3, the structure of 1 A of cylinder type gas generators in this Embodiment is demonstrated.

  As shown in FIGS. 1 to 3, the cylinder type gas generator 1 </ b> A in the present embodiment has a long cylindrical outer shape, and one end and the other end positioned in the axial direction are closed. It has a housing. The housing includes a housing body 10, a holder 20, and a closing member 30. In a space defined by the housing body 10, the holder 20 and the closing member 30, an igniter 40 as an internal component, a gas A jet outlet side cylinder member 50, an igniter side cylinder member 60, a partition wall member 70, a gas generating agent 80, a cushion member 90, and the like are arranged.

  The space provided inside the housing is divided into a plurality of spaces by the gas jet side cylinder member 50, the igniter side cylinder member 60, and the partition wall member 70 described above. In the plurality of spaces, a combustion chamber S1 in which the gas generating agent 80 is mainly accommodated, a gas discharge chamber S4 for discharging the gas generated in the combustion chamber S1 toward the outside of the housing, and the combustion chamber S1 and the gas A gas passage chamber S2 and a decompression chamber S3 that connect the discharge chamber S4 are included.

  The housing body 10 is made of a member having a long cylindrical peripheral wall portion 11 having openings formed at both ends in the axial direction, and is located at one axial end portion thereof (that is, closer to the above-mentioned other end portion of the housing). Gas outlet 12 for jetting gas toward the outside. The holder 20 is made of a short cylindrical member having a penetrating portion 21 extending along the axial direction, and has an annular groove portion 23 for caulking and fixing, which will be described later, formed on the outer peripheral surface thereof so as to extend along the circumferential direction. doing. The closing member 30 is made of a disk-like member having a predetermined thickness, and has an annular groove portion 31 for fixing by caulking, which will be described later, formed on the peripheral surface thereof so as to extend along the circumferential direction.

  The holder 20 is fixed to the housing body 10 so as to close one open end of the housing body 10. Specifically, in a state where the holder 20 is inserted into the opening end of the housing body 10, the peripheral wall portion 11 of the housing body 10 corresponding to the annular groove portion 23 provided on the outer peripheral surface of the holder 20 is radially aligned. The holder 20 is caulked and fixed to the housing body 10 by reducing the diameter toward the inside and engaging with the annular groove 23. Thereby, the one end part of the housing in the axial direction is constituted by the holder 20.

  The closing member 30 is fixed to the housing body 10 so as to close the other opening end of the housing body 10. Specifically, in a state where the closing member 30 is inserted into the opening end of the housing body 10, the peripheral wall portion 11 of the housing body 10 corresponding to the annular groove portion 31 provided on the peripheral surface of the closing member 30 is removed. The closing member 30 is caulked and fixed to the housing body 10 by reducing the diameter toward the inside in the radial direction and engaging with the annular groove 31. Thereby, the other end portion of the housing in the axial direction is constituted by the closing member 30.

  These caulking fixations are caulking fixations called eight-side caulking, in which the diameter of the peripheral wall portion 11 of the housing body 10 is reduced substantially uniformly toward the inside in the radial direction. By performing this caulking, the caulking portions 13 and 14 are provided on the peripheral wall portion 11 of the housing body 10, and the caulking portions 13 and 14 are in close contact with the annular groove portions 23 and 31, respectively. This prevents a gap from being generated between the housing body 10 and the holder 20 and between the housing body 10 and the closing member 30.

  As shown in FIG. 2, another annular groove portion 24 different from the above-described annular groove portion 23 is provided on the outer peripheral surface of the holder 20. The annular groove 24 accommodates a seal member 26 made of an O-ring or the like. Thereby, the sealing member 26 accommodated in the annular groove part 24 provided in the holder 20 will be pinched | interposed by the holder 20 and the surrounding wall part 11 of the housing main body 10, and the airtightness in the said part is ensured. become.

  As shown in FIG. 3, another annular groove 32 different from the annular groove 31 described above is provided on the peripheral surface of the closing member 30. The annular groove 32 accommodates a seal member 33 made of an O-ring or the like. As a result, the seal member 33 accommodated in the annular groove portion 32 provided in the closing member 30 is sandwiched between the closing member 30 and the peripheral wall portion 11 of the housing body 10, and airtightness in the portion is ensured. Will be.

  The housing body 10 may be made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy, or is formed into a bottomed cylindrical shape by pressing a rolled steel plate represented by SPCE. You may be comprised by the electric press-formed goods made by the above, or the electric sewing tube represented by STKM. In particular, when the housing main body 10 is formed of a rolled steel plate press-formed product or an electric-welded tube molded product, the housing main body is cheaper and easier than using a metal member such as stainless steel or steel. 10 can be formed, and the weight can be significantly reduced. On the other hand, the holder 20 and the closing member 30 are made of metal members such as stainless steel, steel, aluminum alloy, and stainless alloy.

  As shown in FIGS. 1 and 2, the igniter 40 is supported by the holder 20 and is assembled to the above-described one end portion in the axial direction of the housing. The igniter 40 is for burning the gas generating agent 80, and is installed so as to face the space inside the housing. More specifically, the holder 20 has a caulking portion 22 for caulking and fixing the igniter 40 at an axial end facing the space inside the housing, and the igniter 40 is attached to the through portion 21. The igniter 40 is clamped and fixed to the holder 20 by caulking the above-described caulking portion 22 in a state in which the caulking portion 22 is caulked while being inserted into the wall portion of the portion that defines the penetrating portion 21 of the holder 20.

  The igniter 40 includes an igniter 41 and a pair of terminal pins 42. A resistor (bridge wire) is attached to the inside of the ignition unit 41 so as to be connected to the pair of terminal pins 42, and the ignition unit 41 is surrounded by or in contact with the resistor. Filled with sparks. Moreover, the ignition part 41 may be loaded with a charge transfer agent as necessary.

Here, the resistance body is generally a nichrome wire or a resistance wire made of an alloy containing platinum and tungsten, and the igniter is generally ZPP (zirconium / potassium perchlorate) or ZWPP (zirconium / tungsten / peroxide). Potassium chlorate), lead tricynate and the like are used. As the transfer _charge, consisting of _{B / KNO 3, B / NaNO} 3, Sr (NO 3) such as composition and consisting of metal powder / oxidant represented by _2, potassium titanium hydride / perchloric acid composition And a composition composed of B / 5-aminotetrazole / potassium nitrate / molybdenum trioxide. In addition, the squib cup surrounding the ignition unit 41 is generally made of metal or plastic.

  When a collision is detected, a predetermined amount of current flows through the resistor via the terminal pin 42. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and the ignition agent starts burning. The high temperature flame generated by the combustion ruptures the squib cup containing the igniting agent. The time from when the current flows through the resistor until the igniter 40 is activated is generally 2 milliseconds or less when a nichrome wire is used as the resistor.

  Between the igniter 40 and the holder 20, a seal member 27 made of an O-ring or the like is interposed. The seal member 27 is for preventing a gap from being generated between the igniter 40 and the holder 20, and thereby the space inside the housing is hermetically sealed.

  A recess 25 is provided at the end in the axial direction that is exposed to the outside of the holder 20 so as to be continuous with the through-hole 21 described above. The hollow portion 25 forms a female connector portion that receives a male connector (not shown) of a harness for connecting the igniter 40 and a control unit (not shown). The portion near the tip of the terminal pin 42 of the igniter 40 is exposed and positioned. A male connector is inserted into the recess 25 serving as the female connector, thereby realizing electrical continuity between the harness core wire and the terminal pin 42.

  In addition, the assembly structure of the igniter 40 with respect to the housing and the seal structure between the housing and the igniter 40 are not limited to the above-described assembly structure and seal structure, and other assembly structures and seal structures may be used. Of course it is good to adopt.

  As shown in FIGS. 1 to 3, a gas jet side cylinder member 50, an igniter side cylinder member 60, and a partition wall member 70 are arranged at predetermined positions in the space inside the housing. These gas outlet side cylinder member 50, igniter side cylinder member 60, and partition member 70 function as members that divide the space inside the housing from each other as described above.

  As shown in FIGS. 1 and 3, a gas outlet side cylinder member 50 as a first cylinder member closes a cylindrical small-diameter portion 51 having a relatively small diameter and one axial end of the small-diameter portion 51. And a cylindrical large-diameter portion 53 that is positioned on the other axial end side of the small-diameter portion 51 and has a relatively large diameter. The small diameter part 51 and the large diameter part 53 are connected via an annular step part 55 located between them. By providing the annular stepped portion 55, the tubular portion of the gas outlet side tubular member 50 is located on the inner peripheral surface side, and the inner peripheral surface side step facing the one end portion side of the housing described above. A surface and an outer peripheral surface side step surface located on the outer peripheral surface side and facing the above-mentioned other end portion side of the housing are formed.

  A hole 52a into which a tip of a rod portion 72 of a partition wall member 70 to be described later is inserted is provided in the bottom 52 of the gas outlet side cylinder member 50. The hole 52a is provided at the center position of the bottom 52, and is formed so as to be parallel to the axial direction of the housing.

  The gas outlet side cylindrical member 50 is disposed in the vicinity of an end portion (that is, the above-described other end portion of the housing) on the side where the closing member 30 is located in the space inside the housing. Here, the bottom portion 52 is in contact with an axial end surface located on the space side inside the housing of the closing member 30, and the outer peripheral surface of the large diameter portion 53 is on the inner peripheral surface of the peripheral wall portion 11 of the housing body 10. It is in contact. Thereby, the gas jet side cylinder member 50 is assembled | attached with respect to the housing in the position of the other end part side of the housing mentioned above.

  The large-diameter portion 53 of the gas outlet side tubular member 50 is preferably press-fitted into the peripheral wall portion 11 of the housing body 10. By comprising in this way, the outer peripheral surface of the large diameter part 53 and the inner peripheral surface of the surrounding wall part 11 will closely_contact | adhere, and it can prevent more reliably that a clearance gap produces between these.

  As shown in FIGS. 1 to 3, an igniter-side cylindrical member 60 as a second cylindrical member is provided at a long cylindrical cylindrical portion 61 and one axial end of the cylindrical portion 61. And a skirt portion 62. The cylindrical portion 61 is arranged so that its axial direction is substantially parallel to the axial direction of the housing. The skirt portion 62 is disposed at a distance from an end portion of the space inside the housing where the holder 20 is located (that is, the above-described one end portion of the housing), and the above-described one end portion of the housing of the tubular portion 61. It has a portion formed so as to spread radially outward from the side.

  The igniter-side cylinder member 60 is disposed at an intermediate position in the axial direction of the housing body 10 in the space inside the housing. Here, the axial end of the cylindrical portion 61 on the closing member 30 side is inserted into the large-diameter portion 53 of the gas outlet side cylindrical member 50 described above to be provided in the gas outlet side cylindrical member 50. A part of the outer peripheral surface of the skirt portion 62 is in contact with the inner peripheral surface of the peripheral wall portion 11 of the housing body 10. Thereby, the igniter side cylinder member 60 is assembled | attached with respect to the gas jet nozzle side cylinder member 50 and the housing in the halfway position of the axial direction of the housing.

  The axial end of the cylindrical portion 61 of the igniter-side cylindrical member 60 on the closing member 30 side is preferably press-fitted into the large-diameter portion 53 of the gas outlet-side cylindrical member 50. By comprising in this way, a part of outer peripheral surface of the cylindrical part 61 and the inner peripheral surface of the large diameter part 53 will closely_contact | adhere, and it can prevent more reliably that a clearance gap produces between these. Become.

  Further, it is preferable that a part of the skirt portion 62 of the igniter-side cylinder member 60 is press-fitted into the peripheral wall portion 11 of the housing body 10. With this configuration, a part of the outer peripheral surface of the skirt portion 62 and the inner peripheral surface of the peripheral wall portion 11 are in close contact with each other, and it is possible to more reliably prevent a gap from being generated therebetween.

  As shown in FIGS. 1 and 3, the partition member 70, which is a member different from the first cylinder member and the second cylinder member, includes a partition wall portion 71 that is a disk-shaped portion having a predetermined thickness, and the partition wall portion 71. And a columnar rod portion 72 standing upright. The partition wall portion 71 is positioned so that its main surface is substantially orthogonal to the axial direction of the housing, and the rod portion 72 is positioned so that its axial direction is substantially parallel to the axial direction of the housing.

  The partition member 70 is in the vicinity of the end portion (that is, the above-mentioned other end portion of the housing) on the side where the closing member 30 is located in the space inside the housing, and the gas outlet side cylinder member 50 and the igniter side cylinder. It arrange | positions so that it may extend inside each of the member 60. As shown in FIG. Here, the outer peripheral surface of the partition wall portion 71 is in contact with the inner peripheral surface of the igniter side cylindrical member 60, and the tip of the rod portion 72 is provided at the bottom portion 52 of the gas outlet side cylindrical member 50 described above. It fits into the hole 52a. Thereby, the partition member 70 is assembled | attached with respect to the gas ejection side cylinder member 50 and the igniter side cylinder member 60 in the position of the other end part side of the housing mentioned above.

  The partition wall portion 71 of the partition wall member 70 is disposed at a predetermined position inside the cylindrical portion 61 of the igniter-side cylinder member 60. Specifically, the rod portion 72 of the partition wall member 70 is provided so as to reach an intermediate position in the axial direction of the tubular portion 61 of the igniter-side cylinder member 60, and thereby the partition wall portion 71 is ignited. It is located inside the cylindrical portion 61 of the container side cylindrical member 60. Therefore, the partition part 71 divides the space inside the cylindrical part 61 into two spaces in the axial direction.

  Note that the partition wall portion 71 of the partition wall member 70 is preferably press-fitted into the cylindrical portion 61 of the igniter-side cylinder member 60. By comprising in this way, the outer peripheral surface of the partition part 71 and the inner peripheral surface of the cylindrical part 61 will closely_contact | adhere, and it can prevent more reliably that a clearance gap produces between these.

  Each of the gas outlet side cylinder member 50, the igniter side cylinder member 60, and the partition wall member 70 described above is formed of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy. In particular, the igniter-side cylinder member 60 is configured by a member having sufficiently high mechanical strength so that the gas generating agent 80 does not greatly deform as the pressure rises even when the gas generating agent 80 burns. Preferably, a member made of a steel plate such as plain steel or special steel (for example, a cold-rolled steel plate or a stainless steel plate) is used. Moreover, the rod part 72 of the partition member 70 is formed in a solid shape so as to have a larger heat capacity.

  As described above, as shown in FIG. 1 to FIG. 3, the space inside the housing is the combustion chamber S <b> 1 that is the above-described four spaces by the gas outlet side cylinder member 50, the igniter side cylinder member 60, and the partition wall member 70. The gas passage chamber S2, the decompression chamber S3, and the gas discharge chamber S4 are partitioned.

  Specifically, the combustion chamber S <b> 1 includes the peripheral wall portion 11 of the housing body 10, the holder 20 and the igniter 40 assembled thereto, the tubular portion 61 and the skirt portion 62 of the igniter-side tubular member 60, and the partition member 70. The gas passage chamber S2 includes the peripheral wall portion 11 of the housing body 10, the large-diameter portion 53 of the gas outlet side cylindrical member 50, and the cylindrical portion of the igniter side cylindrical member 60. 61 and the skirt portion 62 are mainly defined.

  The decompression chamber S3 is mainly defined by the small-diameter portion 51 and the bottom portion 52 of the gas outlet side cylindrical member 50, the cylindrical portion 61 of the igniter-side cylindrical member 60, and the partition portion 71 of the partition member 70, The gas discharge chamber S4 is mainly defined by the peripheral wall portion 11 of the housing body 10, the closing member 30, and the small diameter portion 51 and the large diameter portion 53 of the gas outlet side cylinder member 50.

  In other words, the space inside the housing is defined by the inner cylinder portion (the inner space) formed by the inner cylinder portion constituted by the small diameter portion 51 of the gas outlet side cylinder member 50 and the cylindrical portion 61 of the igniter side cylinder member 60. Includes a part of the combustion chamber S1 and the decompression chamber S3) and an outer space (the outer space includes the gas passage chamber S2 and the gas discharge chamber S4) in the radial direction. In addition, the combustion chamber S1 located on the one end side of the housing and the other end of the housing described above are further separated by the first partition part constituted by the partition part 71 of the partition member 70. The decompression chamber S <b> 3 located on the portion side is partitioned, and the outer space among them is defined by the second partition portion constituted by the large-diameter portion 53 of the gas outlet side cylindrical member 50. did Will be divided into a gas discharge chamber S4 for located above the other end side of the gas passage housing S2 positioned on the end and the housing. In addition, the partition part 71 as a 1st partition part is arrange | positioned rather than the large diameter part 53 as a 2nd partition part at the one end part side mentioned above of the housing.

  As shown in FIGS. 1 to 3, the above-described combustion chamber S1 is loaded with a gas generating agent 80, and a portion of the combustion chamber S1 near the igniter 40 is connected to the holder 20 and the gas. A cushion member 90 is arranged so as to be interposed between the generating agent 80.

  The gas generating agent 80 is a chemical that generates gas by being ignited and burned by hot particles generated by the operation of the igniter 40. As the gas generating agent 80, it is preferable to use a non-azide-based gas generating agent, and it is generally configured 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. The oxidizing agent is selected from basic nitrates such as basic copper nitrate, perchlorates such as ammonium perchlorate and potassium perchlorate, alkali metals, alkaline earth metals, transition metals, and ammonia. Nitrate containing cation is 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, and a combustion adjusting agent. As the binder, for example, an organic binder such as a metal salt of carboxymethyl cellulose or stearate, or an inorganic binder such as synthetic hydrotalcite or acidic clay can be suitably used. As the slag forming agent, silicon nitride, silica, acid clay, etc. can be suitably used. Moreover, as a combustion regulator, a metal oxide, ferrosilicon, activated carbon, graphite, etc. can be used suitably.

  The shape of the molded body of the gas generating agent 80 includes various shapes such as a granular shape, a pellet shape, a granular shape such as a cylindrical shape, and a disk shape. In addition, in the cylindrical shape, a porous (for example, a single-hole cylindrical shape or a porous cylindrical shape) having a through hole inside the molded body is also used. These shapes are preferably selected as appropriate according to the specifications of the airbag apparatus in which the cylinder type gas generator 1A is incorporated. For example, the shape in which the gas generation rate changes with time when the gas generating agent 80 is burned. It is preferable to select an optimal shape according to the specification, such as selecting. In addition to the shape of the gas generating agent 80, it is preferable to appropriately select the size and filling amount of the molded body in consideration of the linear combustion rate, the pressure index, and the like of the gas generating agent 80.

  As shown in FIGS. 1 and 2, the cushion member 90 is provided for the purpose of preventing the gas generating agent 80 made of a molded body from being crushed by vibration or the like, and bending the metal wire. It has a spring part 91 and a pressing part 92 formed by. The spring portion 91 is disposed so that one end thereof is in contact with the holder 20, and a pressing portion 92 is formed at the other end. The pressing portion 92 is configured by arranging metal wires in a substantially parallel manner with a predetermined interval, and is in contact with the gas generating agent 80. As a result, the gas generating agent 80 is urged toward the partition member 70 by the cushion member 90, and is prevented from moving inside the housing.

  In place of the cushion member 90 as described above, a cushion made of a ceramic fiber molded body, rock wool, foamed resin (for example, foamed silicone, foamed polypropylene, foamed polyethylene, etc.), rubber represented by chloroprene and EPDM, or the like. It is good also as using material.

  As shown in FIGS. 1 to 3, the first cylindrical portion (that is, the partition wall portion 71) that is a portion that partitions the combustion chamber S <b> 1 and the gas passage chamber S <b> 2 in the cylindrical portion 61 of the igniter side cylindrical member 60. A plurality of first communication holes 64 are provided along the circumferential direction and the axial direction in a portion of the cylindrical portion 61) that is located closer to the holder 20 than the portion where the is located. The plurality of first communication holes 64 are for communicating the combustion chamber S1 and the gas passage chamber S2, and allows the gas generated in the combustion chamber S1 to pass through when the gas generating agent 80 burns. Thus, the gas flows out toward the gas passage chamber S2.

  Further, the second cylindrical portion (that is, the blocking member rather than the portion where the partition wall portion 71 is located) which is a portion of the cylindrical portion 61 of the igniter-side cylindrical member 60 that divides the gas passage chamber S2 and the decompression chamber S3. A plurality of second communication holes 65 are provided along the circumferential direction and the axial direction in the cylindrical portion 61) located on the 30 side. The plurality of second communication holes 65 are for communicating the gas passage chamber S2 and the decompression chamber S3, and allow the gas flowing into the gas passage chamber S2 to pass therethrough, thereby directing the gas toward the decompression chamber S3. It is for letting it flow out.

  The plurality of second communication holes 65 are preferably provided so as to face the rod portion 72 of the partition member 70. With this configuration, the gas after passing through the plurality of second communication holes 65 is blown to the rod portion 72, so that the gas can be cooled more efficiently and slag (residue) can be captured. The collection function can be enhanced.

  On the other hand, a third communication hole 54 is provided in the circumferential direction and the axial direction in the small diameter portion 51 of the gas outlet side cylindrical member 50 as a third cylindrical portion that is a portion that divides the decompression chamber S3 and the gas discharge chamber S4. A plurality are provided along. The plurality of third communication holes 54 are for communicating the decompression chamber S3 and the gas discharge chamber S4, and allow the gas flowing into the decompression chamber S3 to pass therethrough, thereby directing the gas toward the gas discharge chamber S4. It is for letting it flow out.

  In addition, a plurality of the gas ejection ports 12 described above are provided along the circumferential direction and the axial direction in the peripheral wall portion 11 of the housing body 10 that defines the gas discharge chamber S4. The plurality of gas outlets 12 are for communicating the space inside the housing with the space outside, and allows the gas flowing into the gas discharge chamber S4 to pass therethrough, thereby leading the gas to the outside of the housing. Is to do.

  The plurality of gas ejection ports 12 are preferably provided at positions where the plurality of third communication holes 54 described above do not face each other in the radial direction of the housing. If comprised in this way, it will become possible to make the flow path of the gas in the gas discharge chamber S4 vicinity a labyrinth, and it will become possible to cool the gas more efficiently and to enhance the slag collecting function. become.

  A seal tape 15 is affixed to the inner peripheral surface of the portion of the peripheral wall portion 11 of the housing body 10 that defines the gas discharge chamber S4 where the plurality of gas ejection ports 12 are provided. The seal tape 15 is for closing a plurality of gas outlets 12 provided in the housing body 10 so as to be openable. As the seal tape 15, an aluminum foil or the like coated with an adhesive member on one side is used. Used. Thereby, when the cylinder type gas generator 1A is not operated, the airtightness of the combustion chamber S1, the gas passage chamber S2, the decompression chamber S3, and the gas discharge chamber S4 is ensured.

  FIG. 4 is a diagram schematically showing a gas flow when the cylinder type gas generator shown in FIG. 1 is operated. Next, with reference to this FIG. 4, the operation | movement at the time of the action | operation of the cylinder type gas generator 1A in this Embodiment is demonstrated.

  When a vehicle equipped with the cylinder type gas generator 1A according to the present embodiment collides, a collision is detected by a collision detection means provided separately in the vehicle, and a control unit provided separately in the vehicle based on this is detected. The igniter 40 is actuated by energization from.

  As shown in FIG. 4, the gas generating agent 80 loaded in the combustion chamber S1 is ignited and burned by a flame generated by the operation of the igniter 40, and generates a large amount of gas. Thereby, the gas generated in the combustion chamber S1 flows into the gas passage chamber S2 via the first communication hole 64 provided in the igniter side cylinder member 60. At that time, the gas flowing into the gas passage chamber S2 is blown to the inner peripheral surface of the peripheral wall portion 11 of the housing main body 10 along the radial direction of the housing, and the slag contained in the gas is transferred to the peripheral wall portion 11. It is removed to some extent by adhering to the inner peripheral surface of the.

  The gas blown to the inner peripheral surface of the peripheral wall portion 11 of the housing body 10 then flows in the gas passage chamber S2 along the axial direction of the housing. At that time, the gas is brought into contact with the peripheral wall portion 11 of the housing body 10 so that the heat is removed and the gas is cooled. Thereafter, the gas flowing in the gas passage chamber S2 flows into the decompression chamber S3 through the second communication hole 65 provided in the igniter side cylindrical member 60.

  The gas flowing into the decompression chamber S3 is blown to the rod portion 72 disposed in the decompression chamber S3. Here, since the rod portion 72 is configured to be solid so as to have a larger heat capacity as described above, the gas blown to the rod portion 72 is applied to the outer peripheral surface of the rod portion 72. The contact removes heat and further cools, and the slag contained in the gas is further removed by adhering to the outer peripheral surface of the rod portion 72.

  The gas after being blown to the rod portion 72 flows in the decompression chamber S3 toward the closing member 30 along the axial direction of the housing, and is blown to the bottom portion 52 of the gas outlet side cylindrical member 50. Furthermore, it is cooled and slag is removed. The gas blown to the bottom 52 changes its direction thereafter and flows into the gas discharge chamber S4 through the third communication hole 54 provided in the gas outlet side cylinder member 50.

  When the gas flows into the gas discharge chamber S4, the pressure in the gas discharge chamber S4 increases, and accordingly, the seal tape 15 that closes the gas outlet 12 provided in the peripheral wall portion 11 of the housing body 10 is provided. Torn. As a result, the gas flowing into the gas discharge chamber S4 is ejected to the outside of the housing. At that time, the gas is further cooled in the maze gas discharge chamber S4, and the slag is removed.

  The gas ejected from the gas ejection port 12 is introduced into an airbag provided adjacent to the cylinder type gas generator 1A, and the airbag is inflated and deployed.

  In the cylinder type gas generator 1A in the present embodiment described above, the gas flow direction is changed a plurality of times so that the gas cooling performance and the slag collecting function are remarkably enhanced. Although the members for defining the gas flow path are three members having a relatively simple shape (that is, the gas outlet side cylinder member 50, the igniter side cylinder member 60, and the partition wall). Member 70) only, and when fixing these three members to the housing, it is very simple to insert these three members into the housing body 10 to which the closing member 30 is attached. This can be done by assembly work. Therefore, by operating the above configuration, the number of parts can be reduced, and the assembly work at the time of manufacture can be simplified, so that efficient gas cooling can be performed easily and inexpensively. It can be set as a cylinder type gas generator which can be manufactured.

  In addition, when fixing the gas outlet side cylinder member 50, the igniter side cylinder member 60, and the partition wall member 70 to the housing, these may be inserted in the housing body 10 in order, or all of these in advance. Or it is good also as inserting in the housing main body 10, after making the state assembled partially.

  In addition, by adopting the above configuration, the gas outlet side cylinder member 50, the igniter side cylinder member 60, and the partition wall member 70 are easily positioned and fixed to the housing. Therefore, an unintended gap is not generated between these members, and the combustion chamber S1, the gas passage chamber S2, the decompression chamber S3, and the gas discharge chamber S4 are separated from each other not only when not operating but also when operating. Will be maintained. Therefore, it can be set as the high performance cylinder type gas generator which can implement | achieve a desired operation | movement reliably.

  In addition, the cylinder type gas generator 1A having the above-described configuration is configured such that the gas flow direction is changed a plurality of times inside the housing as described above. The effect of significantly increasing the function can be obtained. Therefore, it is not necessary to install a filter. In that sense, the number of parts can be reduced, the assembly work can be facilitated, and the weight of the cylinder-type gas generator can be greatly reduced. It will be possible.

(Embodiment 2)
FIG. 5 is a schematic view of the vicinity of the gas outlet of the cylinder type gas generator in Embodiment 2 of the present invention. Hereinafter, with reference to this FIG. 5, the cylinder type gas generator 1B in this Embodiment is demonstrated.

  As shown in FIG. 5, the cylinder type gas generator 1B in the present embodiment has a rod portion 72 arranged in the decompression chamber S3 when compared with the cylinder type gas generator 1A in the first embodiment described above. The only difference is that the winding body 73 of the metal wire is extrapolated.

  Specifically, for example, a coil spring as shown in the figure can be used as the winding body 73 of the metal wire, and the coil spring is formed along the axial direction of the gas outlet side cylinder member 50 bottom 52 and the partition wall member 70. It is assembled by being sandwiched between the bottom 52 and the partition wall 71 so as to be lightly compressed by the partition wall 71.

  When configured in this manner, not only the effects described in the first embodiment described above can be obtained, but also the relatively lightweight metal wire wound body 73 can function as a kind of filter, By disposing the wound body 73, it is possible to further enhance the gas cooling performance and the slag collecting function while suppressing an increase in weight.

  The winding body 73 of the metal wire is not limited to the above-described coil spring, and may be configured by simply winding one or a plurality of metal wires around the rod portion 72, or other configurations. May be used.

(Embodiment 3)
FIG. 6 is a schematic view of the vicinity of the gas outlet of the cylinder type gas generator in Embodiment 3 of the present invention. Hereinafter, with reference to this FIG. 6, the cylinder type gas generator 1C in this Embodiment is demonstrated.

  As shown in FIG. 6, the cylinder-type gas generator 1 </ b> C according to the present embodiment has a gas outlet side cylindrical member 50 as shown in FIG. 1 when compared with the cylinder-type gas generator 1 </ b> A according to the first embodiment described above. The only difference is that it does not have the bottom 52 shown in FIG. In such a configuration, the axial end of the small diameter portion 51 of the gas outlet side tubular member 50 is brought into contact with the axial end surface located on the space side inside the housing of the closing member 30 and the partition wall The tip of the rod portion 72 of the member 70 is also abutted against the axial end surface located on the space side inside the housing of the closing member 30.

  In the case of such a configuration, not only the effect described in the first embodiment described above can be obtained, but also further weight reduction can be realized.

(Embodiment 4)
FIG. 7 is a schematic view of the vicinity of the gas outlet of the cylinder-type gas generator according to Embodiment 4 of the present invention, and FIG. 8 is an enlarged view of region VIII shown in FIG. Hereinafter, the cylinder type gas generator 1D in the present embodiment will be described with reference to FIGS.

  As shown in FIGS. 7 and 8, the cylinder-type gas generator 1D in the present embodiment has a closed igniter-side cylinder member 60 when compared with the cylinder-type gas generator 1A in the first embodiment described above. Only the shape of the axial end located on the member 30 side is different.

  Specifically, the diameter of the igniter-side cylindrical member 60 is increased toward the side where the closing member 30 is located (that is, the other end side described above) on the axial end portion located on the closing member 30 side. An enlarged diameter portion 63 is provided, and the distal end of the enlarged diameter portion 63 contacts the inner circumferential surface of the annular stepped portion 55 of the gas outlet side cylindrical member 50 and the inner circumferential surface of the large diameter portion 53, respectively. Touching.

  In this case, as shown in FIG. 8, the thrust acting on the igniter-side cylinder member 60 due to the combustion of the gas generating agent 80 causes the gas outlet-side cylinder member along the axial direction of the housing. 50 acting on the annular stepped portion 55 (the force acting on the annular stepped portion 55 is schematically indicated by an arrow AR1 in the drawing) and the gas outlet side cylinder member 50 along the radial direction of the housing. This acts on the large-diameter portion 53 (the force acting on the large-diameter portion 53 is schematically indicated by an arrow AR2 in the drawing). Therefore, the large-diameter portion 53 of the gas outlet side cylindrical member 50, which is a portion that partitions the gas passage chamber S2 and the gas discharge chamber S4, is more closely attached to the inner peripheral surface of the peripheral wall portion 11 of the housing body 10 during operation. Therefore, it is possible to more reliably prevent a gap from occurring in the portion.

  Furthermore, in the case of such a configuration, the space surrounded by the large diameter portion 53 of the gas outlet side cylindrical member 50 and the cylindrical portion 61 and the enlarged diameter portion 63 of the igniter side cylindrical member 60 is gas. It is formed on the above-mentioned other end side of the housing of the passage chamber S2. Therefore, at least a part of the gas flowing in the gas passage chamber S2 toward the other end side does not immediately flow into the second communication hole 65 provided in the cylindrical portion 61 and flows into the space described above. Therefore, it becomes possible to further enhance the gas cooling performance and the slag collecting function.

  Therefore, by using the cylinder type gas generator 1D as in the present embodiment, not only the effects described in the first embodiment are obtained, but also the combustion chamber S1, the gas passage chamber S2, The decompression chamber S3 and the gas discharge chamber S4 can be reliably maintained in a mutually partitioned state, and a high-performance cylinder-type gas generator capable of realizing a desired operation with certainty can be obtained. And it can be set as the cylinder type gas generator in which the repair function of slag was further improved.

(Embodiment 5)
FIG. 9 is a schematic view of the vicinity of the gas outlet of the cylinder-type gas generator according to Embodiment 5 of the present invention, and FIG. 10 is an enlarged view of region X shown in FIG. Hereinafter, with reference to these FIG. 9 and FIG. 10, the cylinder type gas generator 1E in this Embodiment is demonstrated.

  As shown in FIGS. 9 and 10, the cylinder type gas generator 1E in the present embodiment has a gas outlet side cylinder member 50 of the gas outlet side cylinder member 50 when compared with the cylinder type gas generator 1A in the first embodiment described above. Only the shapes of the large-diameter portion 53 and the annular step portion 55 and the shape of the end portion in the axial direction located on the closing member 30 side of the igniter-side cylindrical member 60 are different.

  Specifically, the annular stepped portion 55 of the gas outlet side cylindrical member 50 has a two-step inner surface and the inner peripheral surface of the large diameter portion 53 of the gas outlet side cylindrical member 50. However, it is comprised by the inclined surface 53a diameter-reduced as it goes to the side (namely, the other end part side mentioned above of the housing) where the closure member 30 is located.

  Moreover, the diameter-expanded part which expands toward the side (namely, the above-mentioned other end part side of the housing) where the closing member 30 is located at the axial end portion located on the closing member 30 side of the igniter side cylindrical member 60 63 is provided, and the distal end surface of the enlarged diameter portion 63 is configured by an inclined surface 63a having a diameter reduced toward the side where the closing member 30 is located.

  Here, the tip of the enlarged diameter portion 63 of the igniter side cylinder member 60 is the side where the igniter 40 is located of the two inner peripheral surface side step surfaces of the annular step portion 55 of the gas outlet side cylinder member 50 ( That is, the inner peripheral surface side step surface on the one end side of the housing) and the inner peripheral surface of the large diameter portion 53 are in contact with each other, and an inclined surface 63a located at the tip of the enlarged diameter portion 63 is The large diameter portion 53 is in contact with the inclined surface 53 a that is the inner peripheral surface. Thereby, it is comprised so that the contact location of the igniter side cylinder member 60 and the gas jet nozzle side cylinder member 50 may include the inclination part which diameter reduces as it goes to the other end part side mentioned above of the housing.

  When configured in this manner, as shown in FIG. 10, the thrust acting on the igniter-side cylinder member 60 due to the combustion of the gas generating agent 80 is generated along the axial direction of the housing. 50 acting on the annular stepped portion 55 (the force acting on the annular stepped portion 55 is schematically indicated by an arrow AR1 in the drawing) and the gas outlet side cylinder member 50 along the radial direction of the housing. This acts on the large-diameter portion 53 (the force acting on the large-diameter portion 53 is schematically indicated by an arrow AR2 in the drawing). Therefore, the large-diameter portion 53 of the gas outlet side cylindrical member 50, which is a portion that partitions the gas passage chamber S2 and the gas discharge chamber S4, is more closely attached to the inner peripheral surface of the peripheral wall portion 11 of the housing body 10 during operation. Therefore, it is possible to more reliably prevent a gap from occurring in the portion.

  Furthermore, in the case of such a configuration, the space surrounded by the large diameter portion 53 of the gas outlet side cylindrical member 50 and the cylindrical portion 61 and the enlarged diameter portion 63 of the igniter side cylindrical member 60 is gas. It is formed on the above-mentioned other end side of the housing of the passage chamber S2. Therefore, at least a part of the gas flowing in the gas passage chamber S2 toward the other end side does not immediately flow into the second communication hole 65 provided in the cylindrical portion 61 and flows into the space described above. Therefore, it becomes possible to further enhance the gas cooling performance and the slag collecting function.

  Therefore, by using the cylinder type gas generator 1E as in the present embodiment, not only the effects described in the first embodiment are obtained, but also the combustion chamber S1, the gas passage chamber S2, The decompression chamber S3 and the gas discharge chamber S4 can be reliably maintained in a mutually partitioned state, and a high-performance cylinder-type gas generator capable of realizing a desired operation with certainty can be obtained. And it can be set as the cylinder type gas generator in which the repair function of slag was further improved.

(Embodiment 6)
FIG. 11 is a schematic view of the vicinity of a gas outlet of a cylinder type gas generator in Embodiment 6 of the present invention. Hereinafter, with reference to this FIG. 11, the cylinder type gas generator 1F in this Embodiment is demonstrated.

  As shown in FIG. 11, the cylinder type gas generator 1F in the present embodiment includes the partition member 70 shown in FIG. 1 or the like when compared with the cylinder type gas generator 1A in the first embodiment described above. 1 and instead of this, the igniter-side cylinder member 60 shown in FIG. 1 is divided into a first igniter-side cylinder member 60A and a second igniter-side cylinder member 60B which are different members separated from each other. The only difference is that

  Specifically, the first igniter-side cylinder member 60A is disposed on the side where the igniter 40 is located (that is, the above-described one end side of the housing) relative to the second igniter-side cylinder member 60B. The first igniter-side cylinder member 60A and the second igniter-side cylinder member 60B are disposed substantially parallel to the axial direction of the housing.

  The first igniter-side cylindrical member 60A is provided at the axial end of the cylindrical cylindrical portion 61a and the side where the closing member 30 of the cylindrical portion 61a is located (that is, the above-mentioned other end side of the housing). A partition wall portion 66a. The partition wall portion 66a closes the axial end portion on the other end side of the housing of the cylindrical portion 61a, and has a hole portion 66a1 at the center position thereof.

  The second igniter-side cylinder member 60B has a bottomed cylindrical shape, and has a cylindrical cylindrical part 61b and a side where the igniter 40 of the cylindrical part 61b is located (that is, the above-mentioned of the housing). And a partition wall portion 66b provided at an end portion in the axial direction on the one end portion side. The partition wall portion 66b closes the axial end portion on the one end portion side of the housing of the cylindrical portion 61b, and has a protrusion 66b1 at the center position thereof. A flange portion 63b extending outward from the tubular portion 61b is provided at the axial end of the tubular portion 61b on the side where the closing member 30 is located (that is, the other end portion side of the housing described above). Yes.

  Here, the partition wall portion 66a of the first igniter-side cylinder member 60A and the partition wall portion 66b of the second igniter-side cylinder member 60B are in contact with each other, and the projection 66b1 is fitted into the hole 66a1 described above. Match. Thereby, 60 A of 1st igniter side cylinder members and the 2nd igniter side cylinder member 60B are combined so that a mutual center axis may correspond, In this state, these 1st igniter side cylinder members 60A and 2nd The igniter side cylinder member 60B is assembled to the gas outlet side cylinder member 50 and the housing.

  When the above configuration is employed, the first communication hole 64 is provided in which the cylindrical portion 61a of the first igniter-side cylindrical member 60A partitions the combustion chamber S1 and the gas passage chamber S2. The second cylinder provided with the second communication hole 65, which corresponds to the cylindrical part, and in which the cylindrical part 61b of the second igniter side cylindrical member 60B partitions the gas passage chamber S2 and the decompression chamber S3. It corresponds to the shape part. Further, the partition wall portion 66a of the first igniter-side cylinder member 60A and the partition wall portion 66b of the second igniter-side cylinder member 60B correspond to the first partition portion that partitions the combustion chamber S1 and the decompression chamber S3. .

  Even in the case of the cylinder type gas generator 1F in the present embodiment described above, the members for defining the gas flow path are three members having a relatively simple shape (that is, the gas outlet side). The cylinder member 50, the first igniter-side cylinder member 60A, and the second igniter-side cylinder member 60B) can be configured only, and the assembly work thereof can be easily performed. Therefore, even when the configuration is operated, the effect described in the first embodiment is obtained.

  In the cylinder type gas generator 1F in the present embodiment, the large-diameter portion 53 of the gas outlet side cylinder member 50 and the second igniter side cylinder member are the same as in the above-described fourth and fifth embodiments. A space surrounded by the cylindrical portion 61b and the flange portion 63b of 60B is formed on the above-described other end side of the housing of the gas passage chamber S2. For this reason, at least a part of the gas flowing in the gas passage chamber S2 toward the other end side does not immediately flow into the second communication hole 65 provided in the cylindrical portion 61b but flows into the space described above. Therefore, it becomes possible to further enhance the gas cooling performance and the slag collecting function.

  In the first to sixth embodiments of the present invention described above, the case where the combustion chamber is configured to include a space located on the holder side with respect to the igniter-side cylinder member is illustrated, but the configuration is not necessarily limited to this. There is no need. That is, the holder may be fixed in a state of being inserted into the igniter-side cylinder member, and in this case, the combustion chamber is located in a space on the above-described one end side (that is, the holder side) of the housing rather than the partition wall. And it is comprised only by the space inside radial direction rather than the cylindrical part of an igniter side cylinder member.

  Further, in the above-described first to sixth embodiments of the present invention, the case where only the igniting agent or the igniting agent and the transfer charge is loaded in the ignition portion of the igniter has been described as an example. When loading, it is not always necessary that it is loaded in the igniter of the igniter, and it is loaded at a position between the igniter of the igniter and the gas generating agent using, for example, a cup-shaped member or container. May be.

  Further, in the above-described sixth embodiment of the present invention, the first partition that divides the combustion chamber and the decompression chamber is divided into a part of the first igniter side cylinder member and a part of the second igniter side cylinder member. However, the first partition portion may be constituted only by a part of the first igniter side cylinder member or a part of the second igniter side cylinder member. Good. Further, the assembly structure of the first igniter-side cylinder member and the second igniter-side cylinder member is not limited to the above-described fitting structure using the protrusion and the hole, and other assembly structures are adopted. It is good as well.

  In addition, in the first to sixth embodiments of the present invention described above, the case where the present invention is applied to a cylinder type gas generator incorporated in a side airbag device is described as an example. The target is not limited to this, but is the same as a cylinder type gas generator or a cylinder type gas generator incorporated in a passenger seat airbag device, curtain airbag device, knee airbag device, seat cushion airbag device, etc. The present invention can also be applied to a so-called T-shaped gas generator having a long outer shape.

  Furthermore, the characteristic configurations shown in the first to sixth embodiments of the present invention described above can naturally be combined with each other within an allowable range in terms of the apparatus configuration.

  Thus, the above-described embodiment disclosed herein is illustrative in all respects and is not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1A to 1F Cylinder type gas generator, 10 housing body, 11 peripheral wall portion, 12 gas outlet, 13, 14 caulking portion, 15 seal tape, 20 holder, 21 penetrating portion, 22 caulking portion, 23, 24 annular groove portion, 25 Recessed portion, 26, 27 Seal member, 30 Closure member, 31, 32 Annular groove portion, 33 Seal member, 40 Igniter, 41 Ignition portion, 42 Terminal pin, 50 Gas outlet side cylindrical member, 51 Small diameter portion, 52 Bottom portion, 52a hole part, 53 large diameter part, 53a inclined surface, 54 third communication hole, 55 annular step part, 60 igniter side cylinder member, 60A first igniter side cylinder member, 60B second igniter side cylinder member, 61 61a, 61b Cylindrical part, 62 Skirt part, 63 Expanded diameter part, 63a Inclined surface, 63b Flange part, 64 First communication hole, 65 Second communication hole, 66a, 66 Partition part, 66a1 hole part, 66b1 projection part, 70 partition member, 71 partition part, 72 rod part, 73 wound body, 80 gas generating agent, 90 cushion member, 91 spring part, 92 pressing part, S1 combustion chamber, S2 Gas passage chamber, S3 decompression chamber, S4 gas discharge chamber.

Claims (8)

A long cylindrical housing in which one end and the other end in the axial direction are closed;
An inner cylindrical portion that divides a space inside the housing into an inner space and an outer space in a radial direction;
A first partition that is located inside the inner cylinder and divides the inner space into a combustion chamber located on the one end side of the housing and a decompression chamber located on the other end side of the housing;
A second partition portion located outside the inner cylinder portion and dividing the outer space into a gas passage chamber located on the one end side of the housing and a gas discharge chamber located on the other end side of the housing When,
An igniter assembled to the one end of the housing to face the combustion chamber;
A gas generating agent accommodated in the combustion chamber,
The first partition is disposed closer to the one end of the housing than the second partition,
The inner cylinder portion has a first communication hole for communicating the combustion chamber and the gas passage chamber in order from the one end portion side to the other end portion side of the housing along the axial direction of the housing. A first cylindrical portion provided with a second cylindrical portion provided with a second communication hole for communicating the gas passage chamber and the decompression chamber, and the decompression chamber and the gas discharge chamber. Including a third tubular portion provided with a third communication hole for communication,
The peripheral wall portion of the housing that defines the gas discharge chamber is provided with a gas outlet for jetting gas toward the outside of the housing,
The second partition part and the third cylindrical part are configured by a first cylindrical member that is a single member having a large diameter part and a small diameter part and integrated with the large diameter part and the small diameter part. And
The first cylindrical member further includes an annular step portion positioned between the large diameter portion which is the second partition portion and the small diameter portion which is the third cylindrical portion,
An axial end portion of the first cylindrical member located on the other end side of the housing is in contact with the other end portion of the housing, and an outer peripheral surface of the large diameter portion is the peripheral wall portion of the housing. The first cylindrical member is assembled to the housing by being in contact with the inner peripheral surface of
An axial end portion of the second cylindrical portion located on the other end side of the housing is inserted into the large diameter portion and comes into contact with the annular step portion, whereby the second cylindrical portion. Is a gas generator assembled to the first cylinder member.   The axial direction end part located in the said other end part side of the said housing of the said 2nd cylindrical part is comprised by the enlarged diameter part which diameter-expands as it goes to the said other end part side of the said housing. The gas generator according to 1.   3. The gas generation according to claim 1, wherein a contact portion between the second tubular portion and the first tubular member includes an inclined portion whose diameter is reduced toward the other end portion of the housing. vessel. The first cylindrical part and the second cylindrical part are constituted by a second cylindrical member which is a single member,
The said 1st partition part is comprised by the separate member inserted in the said 2nd cylinder member different from the said 1st cylinder member and the said 2nd cylinder member, In any one of Claim 1 to 3 The gas generator described. The first cylindrical part and the second cylindrical part are constituted by different members separated from each other,
The said 1st partition part is comprised by the part of the member which comprises the said 1st cylindrical part, and / or the member which comprises the said 2nd cylindrical part, The any one of Claim 1 to 3 A gas generator according to claim 1.   A solid rod portion extending along the axial direction of the housing is provided in a portion corresponding to the space inside the second cylindrical portion of the decompression chamber so as to face the second communication hole. The gas generator according to claim 1, wherein the gas generator is provided.   The gas generator according to claim 6, wherein a wound body of a metal wire is extrapolated to the rod portion.   The gas generator according to any one of claims 1 to 7, wherein the third communication hole and the gas ejection port are provided at a position not facing each other in a radial direction of the housing.

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