Igniter assembly and gas generator having the same

Abstract

The present application provides a technology for improving the pressure resistance of an igniter assembly. The igniter assembly includes an igniter body having an ignition portion filled with a primer and a conductive portion extending from the ignition portion; an igniter collar having a cylindrical wall portion surrounding at least the conductive portion of the igniter body; and a resin molded body sandwiched between the igniter body and the igniter collar to integrate the igniter body and the igniter collar. The igniter collar has a first support portion provided at an inner circumferential portion of the wall portion and formed in a convex shape toward the radial inner side of the wall portion in a manner of being buried in the resin molded body, and a second support portion provided at a position in the inner circumferential portion further away from the ignition portion than the first support portion in the direction of the central axis of the wall portion and formed in a convex shape toward the radial inner side of the wall portion in a manner of being buried in the resin molded body, or formed in a concave shape toward the radial outer side of the wall portion in a manner of filling the resin molded body inside the second support portion.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an igniter assembly in which an electrically ignited igniter main body is fitted to an igniter collar, and a gas generator provided with the igniter assembly. BACKGROUND

[0002] In an igniter assembly provided with an electrically ignited igniter main body, the igniter main body is fixed to an igniter collar formed of metal by resin. Also, the igniter assembly is widely used in which the igniter assembly is fitted to an inflator gas generator via the igniter collar. Patent Literature 1 discloses a gas generator in which an igniter is fixed by a resin molding portion between a metal fixing member and a lower side housing.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2015-157586 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In a case where the gas generator is fitted with the igniter assembly, a force acts on the igniter assembly due to an impact at the time of operation of the igniter main body. In a configuration in which the igniter collar and the igniter main body are integrated by resin, when a force acts on a portion composed of resin and a crack is generated at the portion, a part of the portion composed of resin can fly out to the outside of the igniter assembly.

[0008] In the present disclosure, in view of the above-described problems, an object of the present invention is to provide a technology for improving the pressure resistance of an igniter assembly.

[0009] TECHNICAL SOLUTION

[0010] In order to solve the above-described problems, in the igniter assembly of the present disclosure, a first support portion is provided at a peripheral wall portion of the igniter collar, and a second support portion is provided at a position further from the ignition portion than the first support portion.

[0011] Specifically, the ignition device assembly of the present disclosure includes: an ignition device main body having an ignition portion filled with a primer and a conductive portion extending from the ignition portion; an ignition device collar having a cylindrical peripheral wall portion that at least surrounds the conductive portion of the ignition device main body; and a resin molded body interposed between the ignition device main body and the ignition device collar to integrate the ignition device main body and the ignition device collar, wherein the ignition device collar has: a first support portion provided to an inner peripheral portion of the peripheral wall portion to be formed in a convex shape toward a radial inner side of the peripheral wall portion in a manner of being buried in the resin molded body; and a second support portion provided to a position in the inner peripheral portion that is farther from the ignition portion than the first support portion in a direction along a central axis of the peripheral wall portion, to be formed in a convex shape toward a radial inner side of the peripheral wall portion in a manner of being buried in the resin molded body or to be formed in a concave shape toward a radial outer side of the peripheral wall portion in a manner of the resin molded body being filled in an inner portion of the second support portion, and a minimum dimension of the first support portion in the direction along the central axis is equal to or greater than a minimum dimension of the second support portion in the direction along the central axis.

[0012] Due to an impact at the time of operation of the ignition device main body, the ignition device assembly is likely to generate a crack at a portion where the resin molded body is thinnest. In the ignition device assembly, in the event that a crack is generated in the resin molded body, the resin molded body on the ignition portion side than the crack is supported by the first support portion, and the resin molded body on the top end side of the conductive portion than the crack is supported by the second support portion. Thus, in the ignition device assembly of the present disclosure, in the event that the resin molded body is separated in the event that a crack is generated in the resin molded body, a portion of the resin molded body is prevented from flying out to the outside of the ignition device assembly, and thus the pressure resistance performance can be improved.

[0013] In the above-described ignition device assembly, the connector connection space for connecting a connector that transmits an operation signal of the ignition device main body to the conductive portion can be formed in a position on the top end side of the conductive portion than the first support portion in the direction along the central axis, the second support portion can be formed in a convex shape toward the radial inner side of the peripheral wall portion in a manner of being buried in the resin molded body, and can be formed in a position opposite to the connector connection space. In the ignition device assembly, the connector connection space is likely to secure a prescribed dimension in the radial direction of the peripheral wall portion of the ignition device collar in the direction along the central axis. The ignition device assembly having this configuration is likely to secure a space for forming the second support portion that protrudes toward the radial inner side of the peripheral wall portion of the ignition device collar through the connector connection space.

[0014] In the igniter assembly described above, a plurality of second support portions may be formed discontinuously along the circumferential direction of the peripheral wall portion. By forming a plurality of second support portions discontinuously along the circumferential direction of the peripheral wall portion in the igniter assembly, rotation of the resin molded body relative to the igniter collar can be prevented after the resin of the resin molded body has cured.

[0015] Alternatively, this disclosure may also disclose a gas generator comprising: a housing having a gas outlet; and the aforementioned igniter assembly disposed inside the housing. The igniter assembly of this disclosure can be used in a gas generator.

[0016] In the aforementioned gas generator, the outer casing can also be formed by combining a first housing and a second housing, where a portion of either the first or second housing is the igniter collar, and the igniter assembly is fixed to either the first or second housing, which is partly the igniter collar, by the resin molding body. In this way, a portion of the outer casing can also be configured as the igniter collar.

[0017] Invention Effects

[0018] According to the technology disclosed herein, the pressure resistance of the ignition assembly can be improved. Attached Figure Description

[0019] Figure 1 This is a diagram showing the schematic configuration of a gas generator comprising the igniter assembly of Embodiment 1.

[0020] Figure 2 This is a diagram showing the schematic configuration of the ignition assembly according to Embodiment 1.

[0021] Figure 3 This is a diagram showing the schematic configuration of the igniter assembly in Embodiment 2.

[0022] Figure 4 This is a diagram showing the schematic configuration of the ignition assembly of Modified Example 1 of Embodiment 2.

[0023] Figure 5 This is a diagram showing the schematic configuration of the ignition assembly of Modified Example 2 of Embodiment 2.

[0024] Figure 6 This is a diagram showing the schematic configuration of the gas generator in Embodiment 3. Detailed Implementation

[0025] An ignition device assembly according to an embodiment of the present disclosure and a gas generator provided with the ignition device assembly will be described below with reference to the drawings. Note that each configuration and combination of configurations and the like in each embodiment is one example, and appropriate addition, omission, substitution, and other changes can be made within a scope that does not depart from the gist of the present disclosure. The present disclosure is not limited by the embodiments, but is defined only by the claims.

[0026] <Embodiment 1>

[0027] Figure 1 is a cross-sectional view of a gas generator (hereinafter referred to as "gas generator") 100 using the ignition device assembly 1 according to Embodiment 1 in the axial direction. Figure 1 In the gas generator 100, a single-dot chain line is used to indicate a central axis AX. Note that the gas generator 100 is not limited to a publicly known shape for an airbag, and can be a publicly known shape suitable for a seat belt pretensioner, a curtain airbag, or a publicly known shape such as for various actuators. The gas generator 100 is provided with an upper case 101 (one example of a "first case" in the present application) and a lower case 102 (one example of a "second case" in the present application). The upper case 101 and the lower case 102 are formed of metal and have a substantially cylindrical shape with a bottom. In addition, a plurality of gas discharge ports 104 are formed in the upper case 101 in the circumferential direction. In the gas generator 100, the outer case 103 (one example of an "outer case container" in the present application) having a short cylindrical shape with both ends closed in the axial direction is formed by joining the upper case 101 and the lower case 102 in a state in which the open ends of the upper case 101 and the lower case 102 face each other. The ignition device assembly 1 is disposed inside the outer case 103. Note that the gas discharge ports 104 are closed from the inside of the outer case 103 by a seal band 114 made of aluminum before the ignition device assembly 1 is activated. Details of the ignition device assembly 1 are described later, and a gas generating agent 105 filled inside the outer case 103 is ignited / burned by activation of an ignition device main body 2 (see FIG. 2) provided in the ignition device assembly 1, for example, to generate combustion gas for inflating an airbag (bag body). Figure 2

[0028] In the gas generator 100, an inner cylinder member 108 is disposed in the center inside the outer case 103. A plurality of ignition transfer holes 107 are provided in the peripheral wall of the inner cylinder member 108. A space 109 in which the ignition device assembly 1 and an ignition transfer agent 111 are accommodated is formed inside the inner cylinder member 108. The ignition transfer holes 107 are closed by a seal band 113 made of aluminum. Thus, the airtightness inside the inner cylinder member 108 is ensured.

[0029] ​Further, a combustion chamber 110 that accommodates the gas generating agent 105 is formed on the radially outer side of the inner cylinder member 108. The gas generating agent 105 is supported by a substantially annular floor 115 formed in the combustion chamber 110. As the transfer agent 111, a gas generating agent having good ignitability and a higher combustion temperature than the gas generating agent 105 can be used. Desirably, the combustion temperature of the transfer agent 111 is in the range of 1700°C to 3000°C. As such a transfer agent 111, for example, a well-known transfer agent containing nitroguanidine (34% by weight), strontium nitrate (56% by weight) can be used. Alternatively, as the transfer agent, a well-known black powder (boron / potassium nitrate) can also be used. Further, as the gas generating agent 105, a gas generating agent having a relatively low combustion temperature can be used, for example, desirably, the combustion temperature of the gas generating agent 105 is in the range of 1000°C to 1700°C, and for example, a well-known gas generating agent containing guanidine nitrate (41% by weight), alkaline copper nitrate (49% by weight), and a binder, an additive can be used.

[0030] Further, the igniter assembly 1 is fixed to the lower case 102 side of the inner cylinder member 108. Specifically, a fitting hole 116 is provided in the central portion of the bottom of the lower case 102, and the igniter assembly 1 is inserted into the inner cylinder member 108 in a state in which the open end portion 108a of the inner cylinder member 108 protrudes to the outside of the lower case 102 from the fitting hole 116. Further, the igniter collar 3 of the igniter assembly 1 can be fixed by riveting the open end portion 108a side of the inner cylinder member 108 (see FIG. 2). Figure 2 Further, the inner cylinder member 108 is connected to the lower case 102 by welding or the like in the vicinity of the open end portion 108a on the side that accommodates the igniter assembly 1.

[0031] The gas generating agent 105 is accommodated in the combustion chamber 110, and a filter 106 for capturing combustion residues contained in combustion gas generated by combustion of the gas generating agent 105 and cooling the combustion gas is disposed on the outer side thereof. The filter 106 is formed in a cylindrical shape using a laminated metal mesh or the like, and the outer peripheral surface thereof is disposed so as to oppose the inner peripheral surface of the outer case 103. A gap 112 as a gas flow path is formed between the outer peripheral surface of the filter 106 and the inner peripheral surface of the outer case 103, whereby overall use of the filter 106 is achieved.

[0032] In the gas generator 100 configured as such, when the igniter assembly 1 is operated, the transfer charge 111 disposed in the vicinity thereof is ignited / burned, and a flame thereof is injected into the combustion chamber 110 from the transfer hole 107 formed in the inner cylinder member 108. By this flame, the gas generating agent 105 in the combustion chamber 110 is ignited / burned, and combustion gas is generated. This combustion gas is filtered and cooled during passage through the filter 106, and is discharged to the outside from the gas discharge port 104 by breaking the seal band 114 that closes the gas discharge port 104.

[0033] Next, the igniter assembly 1 of the present embodiment will be described. Figure 2 The igniter assembly 1 of the present embodiment will be described. Figure 2 is an axial sectional view of the igniter assembly 1 of the present embodiment. Figure 2 In the drawing, a single-dot chain line is used to indicate the central axis BX of the igniter assembly 1. Note that, as will be described later, the central axis BX of the igniter assembly 1 coincides with the central axis AX of the gas generator 100 in a state in which the igniter assembly 1 is fitted to the gas generator 100. Figure 1 In the drawing, a single-dot chain line is used to indicate the central axis BX of the igniter assembly 1. Note that, as will be described later, the central axis BX of the igniter assembly 1 coincides with the central axis AX of the gas generator 100 in a state in which the igniter assembly 1 is fitted to the gas generator 100. Figure 2 In the following description, the direction along the central axis BX of the igniter assembly 1 will be taken as the up-down direction of the igniter assembly, the upper side of the paper of the drawing will be taken as the upper side of the igniter assembly 1, and the lower side thereof, i.e., the lower side of the paper of the drawing will be taken as the lower side of the igniter assembly 1. Figure 2 In the following description, the direction along the central axis BX of the igniter assembly 1 will be taken as the up-down direction of the igniter assembly, the upper side of the paper of the drawing will be taken as the upper side of the igniter assembly 1, and the lower side thereof, i.e., the lower side of the paper of the drawing will be taken as the lower side of the igniter assembly 1.

[0034] As shown in Figure 2 , the igniter assembly 1 is provided with an igniter main body 2. The igniter main body 2 has an ignition portion 21 in which a primary explosive is filled, and electrically conductive pins 22, 23 (one example of "electrically conductive portion" in the present application) that extend from the ignition portion 21. The igniter main body 2 is of an electric ignition type that causes the primary explosive in the ignition portion 21 to burn by ignition current supplied from the electrically conductive pins 22, 23.

[0035] The ignition portion 21 has a cup that defines a space in which the primary explosive is housed. The ignition portion 21 is disposed so that a portion corresponding to the bottom of the cup is located on the side of the direction in which combustion products of the primary explosive are discharged when the igniter main body 2 is operated. For example, as shown in Figure 1 , the igniter assembly 1 is disposed in the housing 103 so that the portion corresponding to the bottom of the cup faces the filling position of the transfer charge 111. Thus, in the case where the igniter main body 2 of the igniter assembly 1 is operated, the combustion products from the primary explosive can be discharged toward the transfer charge 111 to ignite / burn the transfer charge 111.

[0036] The electrically conductive pins 22, 23 have a bridge wire (not shown) connected and arranged therebetween in the ignition portion 21 in a state of ensuring electrical insulation therebetween. An initiating explosive filled in the ignition portion 21 is in contact with the bridge wire (not shown) connected and arranged between the electrically conductive pins 22, 23. The initiating explosive ignites and burns due to heat of the bridge wire, and thus, a combustion product is generated. In this way, the igniter body 2 causes the initiating explosive to burn and emit the combustion product thereof.

[0037] Further, the igniter assembly 1 is provided with a metal igniter collar 3. The igniter collar 3 has a cylindrical peripheral wall portion 31 that surrounds the igniter body 2. The central axis of the peripheral wall portion 31 coincides with the central axis BX of the igniter assembly 1. Further, the inner diameter of the peripheral wall portion 31 is formed to be larger than the outer diameter of the ignition portion 21 of the igniter body 2. In the present embodiment, in the direction along the central axis (central axis BX) of the peripheral wall portion 31, the peripheral wall portion 31 of the igniter collar 3 surrounds the igniter body 2 from the middle of the ignition portion 21 toward the lower side to the top end side of the electrically conductive pins 22, 23. Note that the peripheral wall portion 31 is formed in a size at least capable of surrounding the electrically conductive pins 22, 23, and is arranged to surround at least the electrically conductive pins 22, 23.

[0038] Further, the igniter assembly 1 is provided with a resin molded body 4 that is interposed between the igniter body 2 and the igniter collar 3 to integrate the igniter body 2 and the igniter collar 3. The resin molded body 4 is formed to be continuously interposed between the igniter body 2 and the igniter collar 3 by injection molding of a resin material in a manufacturing process of the igniter assembly 1. As the resin material of the resin molded body 4, a resin material excellent in heat resistance, durability, corrosion resistance, and the like after curing can be appropriately used. As such a resin material, for example, a thermoplastic resin such as polybutylene terephthalate resin, polyethylene terephthalate resin, polyamide resin, vulcanized polypropylene resin, polypropylene oxide resin, a thermosetting resin such as epoxy resin, and the like are exemplified. Note that the resin molded body 4 can also be formed to cover the entire periphery of the ignition portion 21.

[0039] The igniter collar 3 has a first support portion 32, which is provided on the inner circumference 31a of the peripheral wall portion 31 and is formed in a convex shape towards the radially inward side of the peripheral wall portion 31, embedded in the resin molded body 4. The igniter collar 3 is integrally formed with the first support portion 32 by casting. Furthermore, the first support portion 32 is continuously formed along the circumference of the peripheral wall portion 31. Viewed along the central axis BX, the first support portion 32 extends below the ignition portion 21 of the igniter body 2 to a position overlapping with the ignition portion 21. That is, the outer diameter of the ignition portion 21 is larger than the inner diameter of the first support portion 32. By providing such a first support portion 32, the ignition portion 21 of the igniter assembly 1, configured as the igniter body 2, cannot pass under the first support portion 32. Therefore, even when the igniter body 2 is working and the upper side of the igniter assembly 1 ( Figure 1 Even when the pressure and temperature inside the inner cylinder component 108 rise, causing the resin molded body 4 to soften and exert a downward force on the igniter assembly 1, the ignition part 21 can still be prevented from passing through the first support part 32 and flying out from below the igniter collar 3. It should be noted that as long as the passage of the ignition part 21 can be prevented, the first support part 32 can also be formed discontinuously in multiple parts along the circumferential direction.

[0040] Furthermore, the igniter collar 3 has a second support portion 33, which is located in the inner peripheral portion 31a at a position farther from the ignition portion 21 than the first support portion 32 in the direction along the central axis of the peripheral wall portion 31. This second support portion 33 is formed in a convex shape towards the radially inward side of the peripheral wall portion 31, embedded in the resin molded body 4. In the radial direction of the peripheral wall portion 31, the second support portion 33 is shorter than the first support portion 32. That is, the length of the second support portion 33 protruding towards the radially inward side of the peripheral wall portion 31 is shorter than that of the first support portion 32. The second support portion 33 is integrally formed with the igniter collar 3 by pressing it into a mold in a manner that cuts the igniter collar 3 from its lower side. Furthermore, multiple second support portions 33 are formed discontinuously along the circumferential direction of the peripheral wall portion 31. In the igniter assembly 1, by forming multiple second support portions 33 discontinuously along the circumferential direction of the peripheral wall portion 31, it is possible to prevent the resin molded body 4 from rotating relative to the igniter collar 3 after the resin of the resin molded body 4 has cured.

[0041] Further, the lower side (tip end side) of the conductive pins 22, 23 is exposed, and a connector connecting space 5, which connects a connector (not shown) that transmits a work signal of the igniter main body 2 to the conductive pins 22, 23, is formed by the resin molded body 4. The resin molded body 4 of the portion where the connector connecting space 5 is formed is integrated with the resin molded body 4 of the portion that surrounds the ignition portion 21 on the upper side than the first support portion 32. By inserting the connector into the connector connecting space 5, the connector is connected to the conductive pins 22, 23. The connector connecting space 5 is formed on the tip end side of the conductive pins 22, 23 than the first support portion 32 in the direction of the central axis of the peripheral wall portion 31. The second support portion 33 is formed at a position opposite to the connector connecting space 5. In the igniter assembly 1, the connector connecting space 5 easily ensures a prescribed dimension in the radial direction of the peripheral wall portion 31 in the direction of the central axis. Therefore, the igniter assembly 1 of the present embodiment, by the connector connecting space 5, easily ensures a space for forming the second support portion 33 that protrudes toward the inner side in the radial direction of the peripheral wall portion 31.

[0042] In a case where there is a portion of thin thickness at the portion of the resin molded body 4 where the connector connecting space 5 is formed, the thus-configured igniter assembly 1 is likely to generate a crack at the portion of the thinnest thickness of the resin molded body 4 due to an impact at the time of operation of the igniter main body 2. Figure 2 In the present embodiment, a virtual line L shown by a dashed line is used to indicate the portion of the thinnest thickness of the resin molded body 4. It is assumed that, when a crack is generated at the portion indicated by the virtual line L, the resin molded body 4 is separated into upper and lower portions with the virtual line L as a boundary. The resin molded body 4 on the upper side than the virtual line L is supported by the first support portion 32, and thus movement thereof to the lower side of the igniter assembly 1 is suppressed. Further, the resin molded body 4 on the lower side than the virtual line L is supported by the second support portion 33 disposed on the lower side than the first support portion 32, and thus movement thereof to the lower side of the igniter assembly 1 is suppressed. Thus, in the igniter assembly 1 of the present embodiment, in a case where the resin molded body 4 is separated due to generation of a crack, a portion of the resin molded body 4 is suppressed from flying out to the outside of the igniter assembly 1.

[0043] Further, as Figure 2As shown, the minimum dimension of the first support portion 32 in the direction of the central axis of the peripheral wall portion 31 is set to A, and the minimum dimension of the second support portion 33 in the direction of the central axis is set to B. In the present embodiment, the minimum dimension A of the first support portion 32 is larger than the minimum dimension B of the second support portion 33. Note that it is preferable that the minimum dimension A of the first support portion 32 be equal to or larger than the minimum dimension B of the second support portion 33. By providing the igniter ferrule 3 with such a first support portion 32 and a second support portion 33, the igniter assembly 1 can suppress the flying out of the igniter body 2 by the first support portion 32, and can suppress the flying out of a portion of the resin molded body 4 to the outside of the igniter assembly 1 by the second support portion 33. In particular, since the majority of the material constituting the igniter body 2 is metal, in order to suppress the flying out of the igniter body 2, it is necessary to make the minimum dimension of the first support portion 32 thick so that it does not deform or the like. By setting the minimum dimension A of the first support portion 32 to be equal to or larger than the minimum dimension B of the second support portion 33, the effect of suppressing the flying out of the igniter body 2 can be improved.

[0044] Further, in the gas generator disclosed in the above-described Patent Document 1, if the metal fixing member deforms when the pressure in the housing rises, a crack is generated in the resin molded portion, and a portion of the resin molded portion flies out to the outside of the gas generator.

[0045] On the other hand, in the igniter assembly of the present embodiment, even in the case where a crack is generated in the resin molded body 4, the flying out of a portion of the resin molded body 4 to the outside of the igniter assembly 1 can be suppressed. As such, according to the igniter assembly 1 of the present embodiment, the pressure resistance performance can be improved.

[0046] <Embodiment 2>

[0047] Next, the igniter assembly 1 of Embodiment 2 will be described. Figure 3 The igniter assembly 1 of Embodiment 2 will be described. Figure 3 is a cross-sectional view of the igniter assembly 1 of the present embodiment in the axial direction. Note that in Figure 3 , the same reference numerals are assigned to substantially the same components as those of Embodiment 1 described above, and the description thereof will be omitted. Figure 3 The igniter assembly 1 of the present embodiment shown in Figure 2 compared to the igniter assembly 1 of Embodiment 1 described above, has substantially the same structure except for the configuration of the second support portion. The igniter ferrule 3 of the igniter assembly 1 of the present embodiment has a second support portion 34 formed in a concave shape toward the radial direction outside of the peripheral wall portion 31 in a manner that the resin molded body 4 is filled inside. For example, the second support portion 34 is a hole formed from the inner peripheral portion 31a side of the igniter ferrule 3 by a drill.

[0048] In the igniter assembly 1 of this embodiment, the resin molded body 4, located below the virtual line L, is supported by a second support portion 34 positioned below the first support portion 32. Therefore, in the igniter assembly 1 of this embodiment, even if the resin molded body 4 cracks and separates along the virtual line L, a portion of the resin molded body 4 (the portion forming the connector connection space) can be prevented from flying out of the igniter assembly 1, thus improving pressure resistance.

[0049] In addition, such as Figure 3 As shown, the minimum dimension of the first support portion 32 along the central axis of the peripheral wall portion 31 is set as A, and the minimum dimension of the second support portion 34 along the central axis is set as B. In this embodiment, the minimum dimension A of the first support portion 32 is greater than the minimum dimension B of the second support portion 34. It should be noted that, preferably, the minimum dimension A of the first support portion 32 is greater than or equal to the minimum dimension B of the second support portion 34. By having the igniter collar 3 have such a first support portion 32 and a second support portion 34, the igniter assembly 1 and... Figure 2 The igniter assembly 1 of the above-described embodiment 1 can also suppress the ejection of the igniter body 2 by means of the first support portion 32, and can suppress the ejection of a portion of the resin molded body 4 to the outside of the igniter assembly 1 by means of the second support portion 34.

[0050] It should be noted that the second support portion 34, which is formed in a concave shape, can also be a hole that penetrates the peripheral wall portion 31. The through hole can be formed in the peripheral wall portion 31 of the igniter collar 3 using a punch. In the igniter assembly 1, the second support portion 34, formed by the through hole, can also prevent a portion of the resin molded body 4 from flying out of the igniter assembly 1. It should be noted that, in either a non-through hole or a through hole configuration, multiple second support portions 34 can be formed discontinuously along the circumference of the peripheral wall portion 31. This prevents the resin molded body 4 from rotating relative to the igniter collar 3 after the resin has cured.

[0051] <Variation Example 1>

[0052] Next, use Figure 4 The igniter assembly 1 of the modified example 1 of this embodiment will be described. Figure 4 This is an axial sectional view of the ignition assembly 1 in this modified example. (See attached image.) Figure 4 As shown, in this modified example, the second support portion 34 is formed by a through hole through which the peripheral wall portion 31 passes. Furthermore, the resin molded body 4 has a protrusion 40 that protrudes radially outward from the outer periphery 31b of the peripheral wall portion 31 in a triangular shape. The protrusion 40 has the following function: to facilitate insertion of the igniter assembly 1 into... Figure 1The protruding portion 40 of the igniter assembly 1 is formed to have a maximum diameter of the igniter assembly 1, and even if the igniter assembly 1 is inserted into the inner cylinder member 108, interference of the metal igniter collar with the inner cylinder member 108 is prevented, and rotation of the igniter assembly 1 with respect to the gas generator 100 is sufficiently prevented, and the holding of the igniter assembly 1 with respect to the gas generator 100 is performed.

[0053] <Modification example 2>

[0054] Next, the igniter assembly 1 of the modification example 2 of the present embodiment will be described. Figure 5 Figure 5 is a cross-sectional view of the igniter assembly 1 of the present modification example in the axial direction. As Figure 5 In the present modification example, the second support portion 34 is constituted by a through-hole that penetrates the peripheral wall portion 31. Also, the resin molded body 4 has a protruding portion 41 that protrudes toward the radial outside from the outer peripheral portion 31b of the peripheral wall portion 31. The protruding portion 41 is formed to cover the entire outer peripheral portion 31b. In addition, in order to make it easy to insert the igniter assembly 1 into the inner cylinder member 108, the protruding portion 41 has a tapered shape in which the diameter is reduced on the upper side. The protruding portion 41, like the protruding portion 40 of the modification example 1, has the following function: to increase the frictional force in such a manner that the igniter assembly 1 does not rotate with respect to the inner cylinder member 108 at the time of the riveting process of the open end portion 108a of the inner cylinder member 108 after the igniter assembly 1 is inserted into the inner cylinder member 108. Figure 1 In the present modification example, the protruding portion 41 is formed to have a maximum diameter of the igniter assembly 1, and even if the igniter assembly 1 is inserted into the inner cylinder member 108, interference of the metal igniter collar with the inner cylinder member 108 is prevented, and rotation of the igniter assembly 1 with respect to the gas generator 100 is sufficiently prevented, and the holding of the igniter assembly 1 with respect to the gas generator 100 is performed.

[0055] <Embodiment 3>

[0056] Next, the gas generator 100 of the present embodiment will be described. Figure 6 Figure 6 is a cross-sectional view of the gas generator 100 of the present embodiment in the axial direction. Note that, in Figure 6 In the present embodiment, the same reference numerals are attached to the substantially same components as those of the above-described embodiment 1, and the description thereof is omitted.

[0057] ​​The gas generator 100 of this embodiment is similar to that of Embodiment 1 described above. The outer casing 103 is formed by combining an upper casing 101 (an example of the "first casing" referred to in this application) and a lower casing 120 (an example of the "second casing" referred to in this application). The lower casing 120 is similar to the lower casing 102 of Embodiment 1, and is formed of metal, having a bottom and being generally cylindrical.

[0058] In this embodiment, a portion of the lower housing 120 is the igniter collar of the igniter assembly 1. For example... Figure 6 As shown, an igniter collar 130 is provided in the lower housing 120, extending from the mounting hole 116 toward the upper side (upper housing 101 side) of the central axis AX. The igniter collar 130 is formed to be embedded inside the inner cylinder member 108 and is assembled to the inner circumferential surface of the inner cylinder member 108 by welding or the like. Thus, the inner cylinder member 108 is fixed relative to the igniter collar 130. It should be noted that the inner cylinder member 108 can also be fixed to the igniter collar 130 by riveting or pressing it into the igniter collar 130. Furthermore, in a configuration where a part of the lower housing 120 is the igniter collar 130, the igniter assembly 1 is fixed to the igniter collar 130 by a resin molded body 4.

[0059] In this embodiment, similar to Embodiment 1, a first support portion 132 is provided. This first support portion 132 is provided on the inner periphery of the peripheral wall portion 131 of the igniter collar 130, and is formed in a convex shape at the upper end of the peripheral wall portion 131 toward the radially inward side, embedded in the resin molded body 4. The first support portion 132 has the same shape and function as the first support portion 32 in Embodiment 1.

[0060] Furthermore, the igniter collar 130 has a second support portion 133, which is located in the inner circumference of the igniter collar 130 at a position farther away from the ignition portion than the first support portion 132 in the direction along the central axis of the peripheral wall portion 131. The second support portion 133 is formed in a convex shape towards the radially inward side of the peripheral wall portion 131, embedded in the resin molded body 4. The second support portion 133 is separately provided from the igniter collar 130 and is fixed to the peripheral wall portion 131 by welding or snap-fit. The resin molded body 4 is injection molded while the second support portion 133 is fixed to the igniter collar 130, so that the second support portion 133 is embedded in the resin molded body 4. The second support portion 133 performs the same function as the second support portion 33 in Embodiment 1.

[0061] Note that the second support portion 133 can be formed integrally with the ignition sleeve 130 as with the second support portion 33 of Embodiment 1, or can be a hole or a through-hole formed concavely toward the radial direction outside of the peripheral wall portion 131 in a manner that the resin molded body 4 is filled in the inside of the second support portion 133 as with the second support portion 34 of Embodiment 2.

[0062] As such, in the case where a portion of the lower case 120 is used as a constituent of the ignition sleeve 130, the first support portion and the second support portion can be provided to the ignition sleeve 130. Thus, according to the gas generator 100 of the present embodiment, the ejection of a portion of the resin molded body 4 to the outside of the ignition assembly 1 can be suppressed, and thus the pressure resistance performance can be improved.

[0063] Further, in the present embodiment, the minimum dimension of the first support portion 132 in the direction of the central axis of the peripheral wall portion 131 is also larger than the minimum dimension of the second support portion 133. Note that it is preferable that the minimum dimension of the first support portion 132 be equal to or larger than the minimum dimension of the second support portion 133. By providing the ignition sleeve 130, which is a portion of the lower case 120, with such a first support portion 32 and a second support portion 33, the ignition assembly 1 can suppress the ejection of a portion of the resin molded body 4 to the outside of the ignition assembly 1.

[0064] <Other Embodiments>

[0065] The above describes the embodiments of the present disclosure, but the various embodiments described above can be combined as much as possible. For example, the gas generator of the above-described embodiments is a disc-shaped gas generator having a length in the height direction that is shorter than the outer diameter in the plan view, but for example, the technology of the present disclosure can also be applied to a cylindrical gas generator having a length in the axial direction that is longer than the outer diameter in the plan view. Further, the gas generator of the above-described embodiments is provided with a gas generating agent as a gas source, but is not limited thereto, and the gas generator can be provided with a compressed gas as a gas source. In the gas generator filled with a compressed gas, the ignition assembly of the above-described embodiments can be used.

[0066] Further, in the above-described embodiments, the second support portions 33, 34, 133 can be formed continuously in the circumferential direction of the peripheral wall portion of the ignition sleeve. Further, in the above-described Embodiment 3, a portion of the upper case 101 can be the ignition sleeve 130, and the ignition assembly 1 can be fixed to the upper case 101 of which a portion is the ignition sleeve 130 by the resin molded body 4.

[0067] The various schemes disclosed in the present specification can be combined with any of the other features disclosed in the present specification.

[0068] Explanation of Reference Signs

[0069] 1: igniter assembly;

[0070] 2: igniter body;

[0071] 3: igniter collar;

[0072] 4: resin molded body;

[0073] 5: connector connecting space;

[0074] 21: ignition portion;

[0075] 22: electrically conductive pin;

[0076] 23: electrically conductive pin;

[0077] 31: peripheral wall portion;

[0078] 31a: inner peripheral portion;

[0079] 31b: outer peripheral portion;

[0080] 32: first support portion;

[0081] 33: second support portion;

[0082] 100: gas generator;

[0083] 101: upper housing;

[0084] 102: lower housing;

[0085] 103: outer shell;

[0086] 104: gas discharge port;

[0087] 105: gas generating agent;

[0088] 106: filter;

[0089] 107: flash hole;

[0090] 108: inner tube member;

[0091] 109: space;

[0092] 110: combustion chamber;

[0093] 111: flash powder;

[0094] 112: gap;

[0095] 113: sealing tape;

[0096] 114: sealing tape;

[0097] 115: bottom plate;

[0098] 116: assembly hole;

[0099] 120: lower case;

[0100] 130: igniter collar;

[0101] 131: peripheral wall portion;

[0102] 132: first support portion;

[0103] 133: second support portion.

Claims

1. An igniter assembly, comprising: an igniter main body having an ignition portion filled with a primer and a conductive portion extending from the ignition portion; and a resin molded body interposed between the igniter main body and an igniter collar to integrate the igniter main body and the igniter collar, wherein the igniter collar has: a first support portion provided at an inner circumferential portion of the peripheral wall portion to be formed in a convex shape toward a radial inner side of the peripheral wall portion in a manner of being buried in the resin molded body; and a second support portion provided at a position in the inner circumferential portion farther from the ignition portion in a direction along a central axis of the peripheral wall portion than the first support portion to be formed in a convex shape toward a radial inner side of the peripheral wall portion in a manner of being buried in the resin molded body or in a concave shape toward a radial outer side of the peripheral wall portion in a manner of the resin molded body being filled in an inside of the second support portion, and wherein a minimum dimension of the first support portion in the direction along the central axis is equal to or greater than a minimum dimension of the second support portion in the direction along the central axis.

2. The igniter assembly according to claim 1, wherein a connector connection space for connecting a connector that transmits a work signal of the igniter main body to the conductive portion is formed on a top end side of the conductive portion in the direction along the central axis than the first support portion, the second support portion is formed in a convex shape toward a radial inner side of the peripheral wall portion in a manner of being buried in the resin molded body, and is formed at a position opposite to the connector connection space. Igniter collar having a cylindrical peripheral wall portion that at least surrounds the electrically conductive portion of the igniter body; 3. The igniter assembly according to claim 1 or 2, wherein a plurality of the second support portions are discontinuously formed in a circumferential direction of the peripheral wall portion.

4. A gas generator, comprising: a housing container having a gas discharge port; and the igniter assembly according to any one of claims 1 to 3 disposed inside the housing container.

5. The gas generator according to claim 4, wherein the housing container is formed by combining a first case and a second case, either one of the first case or the second case is a portion of the igniter collar, and the igniter assembly is fixed to either one of the first case or the second case that is the portion of the igniter collar by the resin molded body. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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