JP2016221996A - Gas generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas generator that can efficiently cool gas and can be easily installed.SOLUTION: The gas generator comprises a housing in a lengthy tube shape, an inner tube member 50A, a bulkhead member 60, an igniter and a gas generating agent. The inner tube member 50A is provided with a tubular portion 52 which partitions a space inside the housing into an inner space and an outer space in a radial direction, and a partitioning portion 53 which partitions the outer space into a gas passage chamber and a gas discharge chamber. The bulkhead member 60 is arranged inside the inner tube member 50A and partitions the inner space into a combustion chamber and a decompression chamber. The inner tube member 50A is provided with a seam reaching both ends along a direction parallel to a shaft direction of the housing. A first tube part 52a and a second tube part 52b of the tubular portion 52, the partitioning portion 53 and a third tube portion 52c extend continuously without being divided from one another in the direction parallel to the shaft direction of the housing, each of which extends substantially continuously in a circumference direction of the inner tube member 50A.SELECTED DRAWING: Figure 8

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 generators disclosed in Patent Documents 1 and 2, a large number of components are assembled inside the housing to enable efficient gas cooling by changing the gas flow direction multiple times. It has been. For this reason, there are problems such as an increase in component costs and a problem in that the assembly work at the time of manufacture becomes complicated due to the complicated assembly structure.

  As a result, there is a strong demand for a gas generator that is easier to assemble and that can efficiently cool the gas. In the gas generator, the gas generated in the combustion chamber during operation is not flown as intended. Since it is necessary to surely pass through the road and be ejected to the outside, it is not easy to reduce the number of parts or simplify the assembly structure when considering the positioning of parts and the assembly structure during assembly. Not enough has been developed yet.

  Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide a gas generator that can efficiently cool a gas and can be easily assembled.

  The gas generator based on this invention is provided with the housing, the inner cylinder member, the partition member, the igniter, and the gas generating agent. The housing is made of a long cylindrical member whose one end and the other end in the axial direction are closed. The inner cylinder member includes a cylindrical portion that divides a space inside the housing into an inner space and an outer space in a radial direction, and a gas passage chamber that is located on the one end side of the housing. A partition section is provided that partitions into a gas discharge chamber positioned on the other end side of the housing. The partition member is located inside the inner cylinder member, and the inner space is divided 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. doing. The igniter is assembled to the one end of the housing so as to face the combustion chamber, and the gas generating agent is accommodated in the combustion chamber. The said partition member is arrange | positioned rather than the said partition part at the said one end part side of the said housing. The inner cylinder member is provided with at least one joint in the circumferential direction that reaches both ends along a direction parallel to the axial direction of the housing. The outer peripheral surface of the partition portion is in contact with the inner peripheral surface of the housing as the partition portion protrudes outward from the cylindrical portion. The cylindrical portion is configured to communicate 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 a direction parallel to the axial direction of the housing. A first cylinder portion provided with one communication hole; a second cylinder portion 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 tube portion provided with a third communication hole for communicating the. 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 first cylinder part, the second cylinder part, the partition part, and the third cylinder part continuously extend without being divided from each other in a direction parallel to the axial direction of the housing. In the portion where the seam is provided, each of the first cylindrical portion, the second cylindrical portion, the partition portion, and the third cylindrical portion extends substantially continuously in the circumferential direction of the inner cylindrical member. doing.

  In the gas generator according to the present invention, an annular step surface is provided on the inner surface of the cylindrical portion so that the inner diameter of the second cylindrical portion is smaller than the inner diameter of the first cylindrical portion. In this case, it is preferable that the partition member is disposed on the inner side of the first cylindrical portion and is in contact with the annular step surface.

  In the gas generator according to the present invention, the locking portion provided on one of the partition member and the inner cylinder member is provided on the other of the partition member and the inner cylinder member. It is preferable to be locked to the locked portion, and it is preferable that the relative movement of the partition member with respect to the inner cylinder member is restricted thereby.

  In the gas generator according to the present invention, the inner circumference of the housing extends along the direction parallel to the axial direction of the housing and projects outward from the cylindrical portion. It is preferable that a plurality of protrusions contacting the surface are provided in the cylindrical portion along the circumferential direction.

  In the gas generator according to the present invention, an annular recess is provided on the inner surface of the cylindrical portion of the portion where the partition portion is provided, and an annular for reinforcing the partition portion is provided in the annular recess. It is preferable that the member is fitted.

  In the gas generator according to the present invention, the inner cylinder member has a bottom portion that substantially closes an axial end located on the other end side of the housing of the inner cylinder member. Preferably it is.

  In the gas generator according to the present invention, a recess is provided on the inner surface of the other end portion of the housing, and an axial end located on the other end portion side of the housing of the inner cylinder member It is preferable that the part is fitted in the recess.

  In the gas generator according to the present invention, the inner cylinder member is provided with only one seam, so that the inner cylinder member has a half-shaped first half body and the first half body. You may be comprised by the single member containing the 2nd half body part of the half shape connected to the part.

  In the gas generator according to the present invention, the thin-walled portion reaching the both ends along the direction parallel to the axial direction of the housing is formed at the connection portion between the first half portion and the second half portion. In this case, the inner cylinder member is bent at the thin-walled portion so that one end and the other end in the circumferential direction of the inner cylinder member abut each other to form the seam. It is preferable that

  In the gas generator according to the present invention, it is preferable that the one end portion of the inner cylinder member is wound around the other end portion of the inner cylinder member.

  In the gas generator according to the present invention, the inner cylinder member is provided with two seams so that the inner cylinder member has a half-shaped first half and a half-shaped second half. You may be comprised by two members with a body.

  In the gas generator according to the present invention, one end portion in the circumferential direction of the first half body and one end portion in the circumferential direction of the second half body are abutted with each other to form one of the seams. In addition, it is preferable that the other end portion in the circumferential direction of the first half body and the other end portion in the circumferential direction of the second half body are abutted with each other to form the other of the joints. .

  In the gas generator according to the present invention, the one end of the first half is wound around the one end of the second half and the other end of the second half. Preferably, the part is wound around the other end of the first half.

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

It is the schematic of the cylinder type gas generator in embodiment of this invention. FIG. 2 is an enlarged schematic cross-sectional view in the vicinity of an igniter of the cylinder type gas generator shown in FIG. FIG. 2 is an enlarged schematic cross-sectional view in the vicinity of a gas outlet of the cylinder type gas generator shown in FIG. 1. It is a schematic cross section along the IV-IV line shown in FIG. It is a schematic cross section along the VV line shown in FIG. It is a schematic cross section along the VI-VI line shown in FIG. It is a disassembled perspective view which shows the assembly structure of the inner cylinder member shown in FIG. 1, a partition member, and an annular member. It is a perspective view which shows the assembly | attachment state of the inner cylinder member shown in FIG. 1, a partition member, and an annular member. 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 a disassembled perspective view which shows the assembly | attachment structure of the inner cylinder member which concerns on a modification, a partition member, and an annular member.

  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.

  FIG. 1 is a schematic view of a cylinder type gas generator according to an embodiment of the present invention. FIGS. 2 and 3 are an enlarged schematic cross-sectional view and a gas in the vicinity of an igniter of the cylinder type gas generator shown in FIG. It is an expansion schematic cross section of a jet nozzle vicinity. 4 to 6 are schematic sectional views taken along lines IV-IV, VV, and VI-VI shown in FIG. 3, respectively. 7 is an exploded perspective view showing the assembled structure of the inner cylinder member, the partition wall member, and the annular member shown in FIG. 1, and FIG. 8 shows the assembled state of the inner cylinder member, the partition wall member, and the annular member. It is a perspective view shown. First, with reference to these FIG. 1 thru | or FIG. 8, the structure of the cylinder type gas generator 1 in this Embodiment is demonstrated.

  As shown in FIGS. 1 to 6, the cylinder type gas generator 1 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 main body 10, a holder 20, and a closing member 30. In a space defined by the housing main body 10, the holder 20, and the closing member 30, an igniter 40 as an internal component, A cylindrical member 50A, a partition wall member 60, an annular 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 inner cylinder member 50A and the partition member 60 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.

  As shown in FIGS. 1 to 3, the housing body 10 is composed of a member having a long cylindrical peripheral wall portion 11 having openings formed at both ends in the axial direction, and one axial end portion thereof (that is, the housing end). A gas outlet 12 for jetting gas toward the outside is provided at the axial end portion located closer to the other end portion. 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-shaped member having a predetermined thickness, and has an annular groove portion 32 for caulking and fixing, which will be described later, formed so as to extend in the circumferential direction on the peripheral surface thereof.

  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 32 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 32. 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 32, 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 portion 33 different from the above-described annular groove portion 32 is provided on the peripheral surface of the closing member 30. The annular groove 33 accommodates a seal member 34 made of an O-ring or the like. As a result, the sealing member 34 accommodated in the annular groove portion 33 provided in the closing member 30 is sandwiched between the closing member 30 and the peripheral wall portion 11 of the housing main body 10, and airtightness in that 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 6, an inner cylinder member 50 </ b> A, a partition wall member 60, and an annular member 70 are arranged at predetermined positions in the space inside the housing. Of these, the inner cylinder member 50A and the partition wall member 60 function as members that divide the space inside the housing from each other as described above.

  The inner cylindrical member 50A substantially includes a cylindrical portion 52, a partition portion 53 provided at a predetermined position in the axial direction of the cylindrical portion 52, and an axial end portion located on the closing member 30 side of the cylindrical portion 52. And has a bottom 54 with a closed bottom, and is close to the end on the side where the holder 20 is located (that is, the above-mentioned one end of the housing) in the space inside the housing. The axial direction is arranged so as to be substantially parallel to the axial direction of the housing so as to reach the end portion (that is, the above-mentioned other end portion of the housing) where the closing member 30 is located from the position.

  Here, as shown in FIG. 7, the inner cylindrical member 50A includes a first half 51A and a second half 51B having a halved shape (that is, a substantially semicircular tube shape), and these first half parts. A single member including 51A and the connecting portion 51C that connects the second half 51B is bent at the connecting portion 51C, so that it is substantially cylindrical as a whole after being bent (that is, a generally circular tube with one end closed). The first half 51A and the second half 51B have substantially the same shape.

  Accordingly, as shown in FIGS. 4 to 6 and 8, the inner cylinder member 50A has a seam A formed by abutting one end and the other end of the inner cylinder member 50A in the circumferential direction. Will have. The seam A reaches the both ends along a direction parallel to the axial direction of the housing, and is located opposite to the bent portion B which is a bent portion of the connecting portion 51C in the circumferential direction. . In addition to the seam A, the inner cylindrical member 50A has a seam in the cylindrical portion 52 that is continuous with the bottom portion 54 and the bent portion B (in the figure, the seam is denoted by A 'in the figure). Will be formed).

  As shown in FIGS. 1 to 3, the cylindrical portion 52 includes a first cylindrical portion 52a, a second cylindrical portion 52b, and a third cylindrical portion 52c having different diameters. The first cylindrical portion 52a, the second cylindrical portion 52b, and the third cylindrical portion 52c are arranged in this order from the side where the holder 20 is positioned along the direction parallel to the axial direction of the housing from the side where the closing member 30 is positioned. It arrange | positions and it is comprised so that the diameter may become large in order of the 2nd cylinder part 52b, the 3rd cylinder part 52c, and the 1st cylinder part 52a.

  A skirt portion 52a1 is provided at the axial end portion of the inner cylinder member 50A on the holder 20 side (that is, the end portion of the first cylinder portion 52a located on the opposite side to the second cylinder portion 52b side). Yes. The skirt portion 52a1 is disposed at a distance from the igniter 40 fixed to the holder 20, and has a portion formed so as to spread radially outward from the above-described end portion of the first cylindrical portion 52a. Yes. Further, a part of the outer peripheral surface of the skirt portion 52 a 1 is in contact with the inner peripheral surface of the peripheral wall portion 11 of the housing body 10.

  On the other hand, the above-described bottom portion 54 is provided at the axial end portion of the inner cylinder member 50A on the closing member 30 side (that is, the end portion of the third cylinder portion 52c located on the opposite side to the second cylinder portion 52b side). Is provided. Here, a concave portion 31 is provided on the inner surface of the closing member 30 that faces the space inside the housing, and the above-described end portion of the third cylindrical portion 52 c including the bottom portion 54 corresponds to the concave portion 31. It is inserted in.

  As shown in FIGS. 1, 3, and 6, the partition portion 53 is provided so as to protrude outward from the tubular portion 52. More specifically, the partition portion 53 is formed by molding so that a portion between the second tube portion 52b and the third tube portion 52c of the tubular portion 52 protrudes outward, It has an annular plate shape as a whole. The outer peripheral surface of the partition part 53 is in contact with the inner peripheral surface of the peripheral wall part 11 of the housing.

  As described above, the inner cylindrical member 50A has one of its axial end portions fitted in the recess 31 of the closing member 30, and the other of the axial end portions and the midway position in the axial direction of each of the peripheral wall portions 11 of the housing. By being in contact with the inner peripheral surface, the shaft is assembled to the housing in a state of being positioned so that the axis thereof is substantially collinear with the axis of the housing.

  The axial end of the inner cylinder member 50 </ b> A on the closing member 30 side is preferably press-fitted into the recess 31 of the closing member 30. With this configuration, the joint formed at the axial end portion of the inner cylinder member 50A (mainly the joint A 'formed at the bottom 54) can be more reliably closed.

  Moreover, it is preferable that the partition part 53 of the inner cylinder member 50 </ b> A is press-fitted into the peripheral wall part 11 of the housing body 10. By comprising in this way, the outer peripheral surface of the partition 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.

  Moreover, it is preferable that a part of the skirt portion 52a1 of the inner cylinder member 50A 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 52a1 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 described above, the inner cylinder member 50A is formed in a substantially cylindrical shape by overlapping the first half body 51A and the second half body 51B by bending the connecting portion 51C. Therefore, as shown in FIGS. 4, 7 and 8, the inner cylinder member 50 </ b> A has the inner cylinder member after bending in addition to the connecting portion 51 </ b> C described above for enabling the bending process. A tightening portion 56a is provided as a fixing means for maintaining the shape of 50A.

  Specifically, as shown in FIG. 7, one end portion in the circumferential direction of the portion constituting the first cylindrical portion 52 a of the first half body portion 51 </ b> A (located on the opposite side to the side on which the connection portion 51 </ b> C is provided). One end portion in the circumferential direction of the end portion of the first half 51A, that is, the portion constituting the seam A, and the portion constituting the first tube portion 52a of the second half 51B (the connection portion 51C is provided) At the end of the second half 51B located on the side opposite to the formed side, that is, the portion that constitutes the seam A), a flat tab 56 that protrudes outward is provided. ing. Among these, the ear 56 provided in the first half 51A can be further tightened by extending the tip in the protruding direction of the ear 51 in the second half 51B. A tightening portion 56a is provided.

  Accordingly, when the inner cylinder member 50A is bent, the ear portion 56 of the first half body portion 51A and the ear portion 56 of the second half body portion 51B are overlapped with each other. If the tightening portion 56a provided on the body portion 51A is tightened around the ear portion 56 of the second half portion 51B, the shape of the inner cylinder member 50A after bending is maintained, and the first tube portion It becomes possible to block the seam A formed in 52a more reliably.

  In addition, the connection part 51C also has a flat plate-like shape, similarly to the ear part 56 described above. More specifically, the connecting portion 51C is the other end portion in the circumferential direction of the portion constituting the first cylindrical portion 52a of the first half body portion 51A (the first portion located on the side opposite to the side on which the ear portion 56 is provided). The other end portion in the circumferential direction of the portion constituting the first tube portion 52a of the second half portion 51B (the end portion of the first half portion 51A) and the second half portion 51B is located on the opposite side to the side where the ear portion 56 is provided. And projecting outward from these ends so as to connect the two half-body portions 51B.

  As shown in FIGS. 4, 7, and 8, the first cylindrical portion 52 a of the inner cylindrical member 50 </ b> A extends along a direction parallel to the axial direction of the housing, and extends outward from the first cylindrical portion 52 a. A plurality of ridges 52f projecting toward the end are provided along the circumferential direction. The protrusion 52f is in contact with the inner peripheral surface of the housing (see FIG. 4).

  The protrusion 52f is a fixing means for positioning and fixing the inner cylinder member 50A with respect to the housing, and combustion due to combustion of the gas generating agent 80 during operation of a cylinder type gas generator 1 described later. It is a deformation suppressing means that prevents the gas passage chamber S2 from being narrowed or closed due to the first cylindrical portion 52a being deformed so as to swell even when the internal pressure of the chamber S1 increases.

  In the inner cylinder member 50A after bending, the ear portion 56 including the connecting portion 51C and the tightening portion 56a is also in contact with the inner peripheral surface of the housing, like the protruding portion 52f. (See FIG. 4). For this reason, these parts also perform the same function as the protrusion 52f, become a fixing means for positioning and fixing the inner cylinder member 50A with respect to the housing, and at the time of operation, the first cylinder 52a It becomes a deformation suppressing means for suppressing deformation.

  Here, the protruding portion 52f and the connecting portion 51C and the ear portion 56 that exhibit the same function as the protruding portion 52f after assembly are disposed at a substantially equal distance in the circumferential direction of the inner cylindrical member 50A. Is preferred. By configuring in this way, the above-described functions are more fully exhibited.

  The inner cylinder member 50A described above is made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy. The inner cylinder member 50A needs to be composed of a member having sufficiently high mechanical strength so that the gas generating agent 80 does not deform greatly as the pressure rises even when the gas generating agent 80 burns. There is 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).

  Here, the inner cylinder member 50A is configured in a substantially cylindrical shape by overlapping the first half part 51A and the second half part 51B by bending the connection part 51C as described above. Therefore, it can be easily formed by pressing the plate-like member. As shown in FIG. 7, if the thin portion 51C1 extending in the axial direction is provided in the connecting portion 51C and the inner cylinder member 50A is bent at the thin portion 51C1 as shown in FIG. The ease and the mechanical strength of the inner cylinder member 50A can be satisfied at the same time.

  As shown in FIGS. 1, 3, 5, 7, and 8, the partition wall member 60 includes a partition wall 61 that is a disk-shaped portion having a predetermined thickness, and an outer side from the peripheral surface of the partition wall 61. It has the to-be-latched part 61a projected toward. The partition wall portion 61 is disposed inside the inner cylinder member 50A so that its main surface is substantially orthogonal to the axial direction of the housing.

  More specifically, an annular step surface 52d (see FIG. 3 and the like) is provided on the inner surface of the inner cylinder member 50A so that the inner diameter of the second cylinder part 52b is smaller than the inner diameter of the first cylinder part 52a. The partition wall member 60 is disposed inside the first cylindrical portion 52a so as to abut on the annular step surface 52d.

  Further, the first cylindrical portion 52a at a position corresponding to the locked portion 61a provided in the partition wall member 60 is provided with a locking portion 52e (see FIGS. 5 and 7) formed of a through hole. The partition member 60 is fixed to the inner cylinder member 50A by fitting the locked portion 61a into the locking portion 52e formed of the through hole. The locking portion 52e and the locked portion 61a limit the relative movement of the partition wall member 60 with respect to the inner cylinder member 50A after assembly, whereby the partition wall member 60 is firmly attached to the inner cylinder member 50A. It will be fixed.

  The peripheral surface of the partition wall portion 61 of the partition wall member 60 is in contact with the inner peripheral surface of the first cylinder portion 52a of the inner cylinder member 50A, whereby the space inside the inner cylinder member 50A is axially formed by the partition wall portion 61. It will be divided into two spaces.

  In addition, it is preferable that the partition part 61 of the partition member 60 is press-fitted into the first cylinder part 52a of the inner cylinder member 50A. By comprising in this way, the surrounding surface of the partition part 61 and the inner peripheral surface of the 1st cylinder part 52a will closely_contact | adhere, and it can prevent more reliably that a clearance gap produces between these.

  As shown in FIGS. 1, 3, 6, and 7, the annular member 70 has an annular flat plate shape with a hole 71 provided in the center thereof, and is formed inside the inner cylindrical member 50A. Is arranged.

  More specifically, an annular recess 53a is provided on the inner surface of the inner cylinder member 50A where the partition portion 53 is provided, and the annular member 70 is fitted into the annular recess 53a so that the annular member 70 is connected to the inner cylinder member 50A. It is fixed to. The annular member 70 is a member that reinforces the mechanical strength of the partition portion 53, and the partition portion 53 is deformed or damaged due to the thrust of the gas when the cylinder type gas generator 1 described later is operated. This is to prevent this.

  Each of the partition member 60 and the annular member 70 described above is made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy. In addition, since the said partition member 60 and the cyclic | annular member 70 are members in which high mechanical strength is fuse | melted, it is preferable to be comprised with the member thicker than 50 A of inner cylinder members.

  As shown in FIG. 7, both the partition member 60 and the annular member 70 are sandwiched between the first half part 51A and the second half part 51B constituting the inner cylinder member 50A when the inner cylinder member 50A is bent. Is assembled to the inner cylinder member 50A. Accordingly, as shown in FIGS. 1 to 6 and 8, after the inner cylinder member 50A is assembled, the partition wall member 60 and the annular member 70 are both fixed inside the inner cylinder member 50A. .

  Here, in the state after assembly shown in FIG. 8 (that is, the state shown in FIGS. 1 to 6), the first cylindrical part 52a and the second cylindrical part 52b constituting the cylindrical part 52 of the inner cylindrical member 50A. And the 3rd cylinder part 52c and the partition part 53 are continuously extended in the direction parallel to the axial direction of a housing, without being mutually divided | segmented. That is, the inner cylinder member 50A is not configured by combining a plurality of components separated from each other at least in the axial direction, and is integrally configured in the axial direction.

  In this state, each of the first cylinder part 52a, the second cylinder part 52b, the third cylinder part 52c, and the partition part 53 constituting the inner cylinder member 50A extends substantially continuously in the circumferential direction. Will do. That is, these portions of the inner cylindrical member 50A have seams A, A ′, a bent portion B and the like in the circumferential direction, but are substantially constituted by a cylindrical member having no gap. .

  As described above, as shown in FIGS. 1 to 6, the internal space of the housing is divided into the above-described four spaces, the combustion chamber S1, the gas passage chamber S2, the decompression chamber S3, and the inner cylinder member 50A and the partition wall member 60. It will be divided into gas discharge chamber S4.

  Specifically, the combustion chamber S1 includes the peripheral wall portion 11 of the housing body 10, the holder 20, the igniter 40 assembled thereto, the first cylindrical portion 52a and the skirt portion 52a1 of the inner cylindrical member 50A, the partition wall The gas passage chamber S2 is mainly defined by the partition wall 61 of the member 60. The gas passage chamber S2 includes the peripheral wall 11 of the housing body 10, the first cylinder 52a, the second cylinder 52b, and the partition of the inner cylinder member 50A. 53 and the skirt portion 52a1.

  The decompression chamber S3 is mainly defined by the second and third cylinder portions 52b and 52c and the bottom 54 of the inner cylinder member 50A and the partition wall 61 of the partition wall member 60, and the gas discharge chamber S4 is These are mainly defined by the peripheral wall portion 11 of the housing body 10, the closing member 30, and the third cylindrical portion 52c and the partition portion 53 of the inner cylindrical member 50A.

  In other words, the space inside the housing is divided into an inner space (the inner space includes a part of the combustion chamber S1 and the decompression chamber S3) and an outer space (by the cylindrical portion 52 of the inner cylinder member 50A). In the outer space, the gas passage chamber S2 and the gas discharge chamber S4 are included) in the radial direction, and the inner space is further partitioned by the partition wall 61 of the partition wall member 60. While being divided into the combustion chamber S1 located on the one end side of the housing and the decompression chamber S3 located on the other end side of the housing, the outer space of these is defined as the inner cylinder member 50A. The partition portion 53 divides the gas passage chamber S2 located on the one end side of the housing and the gas discharge chamber S4 located on the other end side of the housing. In addition, the partition part 61 of the partition member 60 is arrange | positioned rather than the partition part 53 of 50 A of inner cylinder members 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 1 is incorporated. For example, the shape in which the gas generation rate changes with time during the combustion of the gas generating agent 80. 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 wall member 60 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, a first communication hole 55a is formed in the first cylinder portion 52a, which is a portion that divides the combustion chamber S1 and the gas passage chamber S2 in the cylindrical portion 52 of the inner cylinder member 50A. Are provided along the circumferential direction and the axial direction. The plurality of first communication holes 55a 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 communication hole 55b is provided along the circumferential direction and the axial direction in the second cylindrical portion 52b, which is a portion that partitions the gas passage chamber S2 and the decompression chamber S3 in the cylindrical portion 52 of the inner cylindrical member 50A. Are provided. The plurality of second communication holes 55b 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.

  On the other hand, a third communication hole 55c is provided along the circumferential direction and the axial direction in the third cylindrical portion 52c, which is a portion that divides the decompression chamber S3 and the gas discharge chamber S4 in the cylindrical portion 52 of the inner cylindrical member 50A. Are provided. The plurality of third communication holes 55c 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 that do not face the plurality of third communication holes 55c described above 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 1 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.

  Here, the total opening area of the plurality of first communication holes 55a provided in the first cylinder part 52a of the inner cylinder member 50A is D1, and the plurality of second parts provided in the second cylinder part 52b of the inner cylinder member 50A. The total opening area of the communication hole 55b is D2, and the total opening area D3 of the third communication hole 55c provided in the third cylinder part 52c of the inner cylinder member 50A is a plurality of openings provided in the peripheral wall part 11 of the housing body 10. When the total opening area of the gas outlet 12 is D4, among these total opening areas D1 to D4, the total opening area D4 of the plurality of gas outlets 12 is more than the other total opening areas D1, D2, and D3. It is preferable to be configured to be smaller.

  In such a configuration, since the housing functions exclusively as a pressure partition wall, it is possible to avoid a great amount of pressure from acting on the inner cylinder member 50A during the operation of the cylinder type gas generator 1A. As a result, the thickness of the inner cylinder member 50A can be reduced, and the shape processing can be performed more easily. In addition, the magnitude relationship of the total opening area mentioned above is an example to the last, and is not limited to this.

  FIG. 9 is a diagram schematically showing the gas flow when the cylinder type gas generator shown in FIG. 1 is operated. Next, with reference to this FIG. 9, the operation | movement at the time of the action | operation of the cylinder type gas generator 1 in this Embodiment is demonstrated.

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

  As shown in FIG. 9, the gas generating agent 80 loaded in the combustion chamber S1 is ignited and burned by the 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 through the first communication hole 55a provided in the first cylinder portion 52a of the inner cylinder member 50A. 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 through the gas passage chamber S2 flows into the decompression chamber S3 via the second communication hole 55b provided in the second cylinder portion 52b of the inner cylinder member 50A.

  The gas flowing into the decompression chamber S3 flows through the interior of the decompression chamber S3 toward the closing member 30 along the axial direction of the housing, and is further cooled by being blown onto the bottom 54 of the inner cylinder member 50A. Slag is removed. The gas blown to the bottom portion 54 changes its direction thereafter and flows into the gas discharge chamber S4 through the third communication hole 55c provided in the third cylinder portion 52c of the inner cylinder member 50A.

  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 1 to inflate and deploy the airbag.

  In the cylinder-type gas generator 1 according to 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. However, the member for defining the gas flow path is substantially constituted by only two members (that is, the inner cylinder member 50A and the partition wall member 60). Even when these two members are fixed to the housing, the inner cylinder member 50A is bent and fastened in advance while fitting the partition wall member 60 into the inner cylinder member 50A, The assembly can be performed by a very simple assembly operation of inserting. 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.

  Further, by adopting the above configuration, the inner cylinder member 50A and the partition wall member 60 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, as described above, the cylinder-type gas generator 1 having the above-described configuration is configured such that the gas flow direction is changed a plurality of times inside the housing. The effect of significantly increasing the collecting 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.

  In the present embodiment described above, the case where the inner cylinder member 50A is constituted by a single member has been described as an example. However, it is good also as comprising this by dividing | segmenting an inner cylinder member in the circumferential direction and combining this. FIG. 10 is an exploded perspective view showing an assembly structure of the inner cylinder member, the partition wall member, and the annular member according to the modification.

  As shown in FIG. 10, in this modification, the inner cylinder member 50B is divided into two in the circumferential direction. Specifically, the inner cylinder member 50B includes a first half 51A ′ having a half-divided shape (that is, a generally semicircular tube shape) and a second half 51B having a half-divided shape (that is, a generally semicircular tube shape). The first half 51A ′ and the second half 51B ′ have completely the same shape.

  Here, an ear 56 is provided at one end in the circumferential direction of the portion constituting the first cylindrical portion 52a of the first half 51A ′, and the first cylindrical portion 52a of the first half 51A ′ is provided. An ear portion 56 including a tightening portion 56a is provided at the other end portion in the circumferential direction of the constituting portion. On the other hand, one end portion in the circumferential direction of the portion constituting the first cylinder portion 52a of the second half 51B ′ is provided with an ear portion 56 including a tightening portion 56a, and the second half 51B ′ An ear portion 56 is provided at the other end portion in the circumferential direction of the portion constituting the one cylinder portion 52a.

  When assembling the inner cylinder member 50B having the above configuration, the pair of ears 56 of the first half 51A ′ and the pair of ears 56 of the second half 51B ′ are overlapped with each other. Thereafter, the tightening portion 56a provided at the one end portion of the second half 51B ′ is tightened around the ear portion 56 provided at the one end portion of the first half 51A ′, and the first half 51A ′. The tightening portion 56a provided at the other end is wound around the ear portion 56 provided at the other end of the second half 51B ′.

  The inner cylinder member 50B configured as described above has a different configuration from the above-described inner cylinder member 50A in that the seam A is provided in two locations facing each other in the circumferential direction. Has substantially the same configuration as the above-described inner cylinder member 50A. Therefore, even when the inner cylinder member 50B is used, the above-described effects can be obtained.

  In the above-described embodiment of the present invention and the modification thereof, the explanation has been given by exemplifying the case where the inner cylinder member is substantially divided into two in the circumferential direction (that is, divided in half). Of course, the inner cylinder member can be further divided into three or more.

  Further, in the above-described embodiment of the present invention and the modification thereof, the description has been given by exemplifying the case where the inner cylinder member constituted substantially in two is fixed by winding. Besides these, various methods such as welding and locking (for example, locking using a locking claw, etc.) can be applied. Moreover, it is not always necessary to perform the fixing, and it may be inserted into the housing as it is without being fixed, and as a result, these may be fixed so as to be immovable by being inserted into the housing.

  Further, in the above-described embodiment of the present invention and its modifications, the diameters of the first to third cylinder parts of the inner cylinder member are increased in the order of the second cylinder part, the third cylinder part, and the first cylinder part. Although the description has been given by exemplifying the case where it is configured as described above, it is not always necessary to configure in this way.

  Further, in the above-described embodiment of the present invention and the modification thereof, a recess is provided on the inner surface of the closing member that constitutes the other end of the housing in the axial direction, and the axial end of the inner cylinder member is provided in the recess. However, it is not always necessary to have such a configuration, and the inner end of the inner cylinder member is simply provided on the inner surface without providing a recess. It is good also as a structure which abuts a part.

  Further, in the above-described embodiment of the present invention and the modification thereof, the case where the combustion chamber is configured so as to include a space located on the holder side with respect to the inner cylinder member is exemplified, but such a configuration is not necessarily provided. do not have to. That is, a part of the holder may be fixed in a state of being inserted into the inner cylinder member. In this case, the combustion chamber is located at the above-described one end side in the axial direction of the housing than the partition wall portion of the partition member ( That is, it is configured only by a space on the holder side) and a space radially inward from the first cylindrical portion of the inner cylindrical member.

  Further, in the above-described embodiment of the present invention and the modification thereof, there is a case in which the locking member is provided on the partition wall member and the locking member is provided on the inner cylinder member so that they are locked to each other. Although illustrated and explained, the partition member is not necessarily locked to the inner cylinder member via these locking mechanisms, and may be fixed simply by fitting.

  Further, in the above-described embodiment of the present invention and the modification thereof, the case where an annular member for reinforcing the partition portion of the inner cylinder member is provided has been described as an example, but the annular member is necessarily required. However, if sufficient mechanical strength can be maintained only by the partition portion, it is not necessary to provide this.

  Further, in the above-described embodiment of the present invention and the modifications thereof, the case where only the igniting agent or the igniting agent and the transfer charge is loaded in the igniter of the igniter has been described as an example. Is not necessarily loaded in the ignition part of the igniter, but is loaded at a position between the ignition part of the igniter and the gas generating agent using, for example, a cup-shaped member or a container. It may be.

  Further, the shape, size, number, arrangement position, etc., of each component shown in the above-described embodiment of the present invention and its modifications (for example, the number of first to third communication holes and gas outlets, The size, arrangement position, etc.) are merely examples, and various changes can be made.

  In addition, in the above-described embodiment of the present invention and the modifications thereof, 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 scope of application is not limited to this. 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. Similarly, the present invention can be applied to a so-called T-shaped gas generator having a long outer shape.

  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.

  DESCRIPTION OF SYMBOLS 1 Cylinder type gas generator, 10 Housing main body, 11 Circumferential wall part, 12 Gas ejection port, 13,14 Caulking part, 15 Seal tape, 20 Holder, 21 Through part, 22 Caulking part, 23, 24 Annular groove part, 25 Indentation part 26, 27 Seal member, 30 Closure member, 31 Recess, 32, 33 Annular groove portion, 34 Seal member, 40 Igniter, 41 Ignition portion, 42 Terminal pin, 50A, 50B Inner cylinder member, 51A First half body portion, 51B second half part, 51C connecting part, 51C1 thin part, 51A 'first half, 51B' second half, 52 cylindrical part, 52a first cylindrical part, 52a1 skirt part, 52b second cylindrical part, 52c 3rd cylinder part, 52d Annular level | step difference surface, 52e Locking part, 52f Projection part, 53 Partition part, 53a Annular recessed part, 54 Bottom part, 55a 1st communicating hole, 55b 2nd communicating hole, 55c 3rd communicating hole, 56 ear | edge part, 56a Winding part, 60 partition member, 61 partition part, 61a to-be-latched part, 70 annular member, 71 hole part, 80 gas generating agent, 90 cushioning material , 91 Spring part, 92 pressing part, A, A ′ joint, B bending part, S1 combustion chamber, S2 gas passage chamber, S3 decompression chamber, S4 gas discharge chamber.

Claims (13)

A long cylindrical housing in which one end and the other end in the axial direction are closed;
A cylindrical portion that divides a space inside the housing into an inner space and an outer space in a radial direction, a gas passage chamber that positions the outer space on the one end side of the housing, and the other end portion of the housing An inner cylinder member provided with a partition section partitioned into a gas discharge chamber located on the side;
A partition member located inside the inner cylinder member and partitioning 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;
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 partition member is disposed closer to the one end of the housing than the partition,
The inner cylindrical member is provided with at least one or more seams in the circumferential direction that reach both ends along a direction parallel to the axial direction of the housing,
The outer peripheral surface of the partition part abuts on the inner peripheral surface of the housing by projecting the partition part outward from the cylindrical part,
The cylindrical portion is configured to communicate the combustion chamber and the gas passage chamber in order from the one end side to the other end side of the housing along a direction parallel to the axial direction of the housing. A first cylinder portion provided with one communication hole; a second cylinder portion provided with a second communication hole for communicating the gas passage chamber and the decompression chamber; the decompression chamber and the gas discharge chamber; A third tube portion provided with a third communication hole for communicating
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 first cylinder part, the second cylinder part, the partition part and the third cylinder part continuously extend without being divided from each other in a direction parallel to the axial direction of the housing,
In the portion where the seam is provided, each of the first tube portion, the second tube portion, the partition portion, and the third tube portion extends substantially continuously in the circumferential direction of the inner tube member. A gas generator. An annular step surface is provided on the inner surface of the cylindrical portion so that the inner diameter of the second cylindrical portion is smaller than the inner diameter of the first cylindrical portion;
2. The gas generator according to claim 1, wherein the partition member is disposed inside the first cylindrical portion and is in contact with the annular step surface.   A locking portion provided on one of the partition member and the inner cylinder member is locked to a locked portion provided on the other of the partition member and the inner cylinder member, whereby the partition wall The gas generator according to claim 1 or 2, wherein relative movement of the member with respect to the inner cylindrical member is restricted.   A ridge that extends along a direction parallel to the axial direction of the housing and protrudes outward from the tubular portion to contact the inner peripheral surface of the housing in the circumferential direction. The gas generator according to any one of claims 1 to 3, wherein a plurality of the cylindrical portions are provided along the cylindrical portion. An annular recess is provided on the inner surface of the cylindrical portion of the portion where the partition portion is provided,
The gas generator according to any one of claims 1 to 4, wherein an annular member for reinforcing the partition portion is fitted into the annular recess.   The said inner cylinder member has a bottom part which substantially obstruct | occludes the axial direction edge part located in the said other end part side of the said housing of the said inner cylinder member. Gas generator. A recess is provided on the inner surface of the other end of the housing;
The gas generator according to any one of claims 1 to 6, wherein an axial end portion of the inner cylindrical member located on the other end side of the housing is fitted in the recess.   The inner cylinder member is provided with only one seam, so that the inner cylinder member is divided into a half-shaped first half part and a half-shaped second half part connected to the first half part. The gas generator in any one of Claim 1 to 7 comprised by the single member containing a part. The connecting part between the first half part and the second half part is provided with a thin part that reaches both ends along a direction parallel to the axial direction of the housing,
The gas generator according to claim 8, wherein the inner cylinder member is bent in the thin-walled portion, whereby one end portion and the other end portion in the circumferential direction of the inner cylinder member are abutted with each other to form the seam. .   The gas generator according to claim 9, wherein the one end portion of the inner cylinder member is wound around the other end portion of the inner cylinder member.   The said inner cylinder member is comprised by two members of the 1st half body of a half shape, and the 2nd half body of a half shape by providing the said seam in two places in the said inner cylinder member. The gas generator according to any one of 1 to 7.   One end of the first half in the circumferential direction and one end in the circumferential direction of the second half are abutted with each other to form one of the seams, and the circumferential direction of the first half The gas generator according to claim 11, wherein the other end of the second half and the other end in the circumferential direction of the second half are abutted against each other to form the other of the joints.   The one end of the first half is wound around the one end of the second half, and the other end of the second half is the other end of the first half. The gas generator of claim 12, wherein the gas generator is wound by

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