JP3134430U - Igniter assembly and gas generator having the same - Google Patents

Abstract

Provided is an igniter assembly capable of reliably ensuring a sealing property for a long period of time even when a structure in which an igniter is fixed to a holder by a resin molding portion formed by injection molding is employed.
An igniter 20 is disposed in a hollow opening of a holder 10 so that a part of an igniter 21 protrudes outward from one axial end face 12 of the holder 10. The resin molding part 30 is formed so as to fill a space between the holder 10 and the igniter 20, and is fixed to the holder 10 and the igniter 20. The axial end surface 12 of the holder 10 has a fixed region S <b> 1 covered by the resin molded portion 30 and an exposed region S <b> 2 not covered by the resin molded portion 30. The to-be-adhered area | region S1 contains the convex part 13 with the height of 1.0 mm or more and 1.5 mm or less projected from the axial direction end surface 12 of the holder 10 toward the axial direction.
[Selection] Figure 1

Description

  The present invention relates to an igniter assembly suitably used for an air bag device as an occupant protection device mounted on a vehicle or the like, or a gas generator incorporated in a seat belt pretensioner, and a gas generator including the igniter assembly. More specifically, an igniter assembly including an igniter, a holder for fixing the igniter to the housing, and a resin molding portion for fixing the igniter to the holder, and the same Gas generators.

  A gas generator that instantaneously generates gas when a vehicle or the like collides is incorporated in an airbag device or a seat belt pretensioner as an occupant protection device. In the gas generator, the gas generating agent is accommodated in a metal housing. The igniter is assembled to the housing in which the gas generating agent is accommodated. As the assembly structure, an assembly structure through a metal holder is generally employed. More specifically, the holder has a substantially cylindrical shape having a hollow opening, and an igniter is arranged and fixed in advance in the hollow opening, and the holder to which the igniter is assembled is attached to the housing. By fixing, the igniter is assembled to the housing.

  Gas generators using such an igniter assembly include so-called disk-type gas generators, side airbag devices, and curtains that are preferably incorporated in driver seat airbag devices and the like equipped on steering wheels. There are so-called cylinder-type gas generators suitably incorporated in air bag devices, so-called micro gas generators (MGG) suitably incorporated in seat belt pretensioners and the like.

  There are various structures for assembling the igniter to the holder. For example, an assembly structure is known in which an igniter is assembled to a holder by injection molding (more specifically, insert molding) using a resin material as a raw material. When the assembly structure is adopted, an insulating fluid resin material is poured into the space between the igniter disposed in the hollow opening of the holder and the holder, and the resin molded portion is solidified by solidifying it. The igniter is fixed to the holder by being formed and the resin molding portion being fixed to the surface of the igniter and the surface of the holder, respectively. That is, when the assembly structure is adopted, an igniter assembly includes an igniter, a holder for fixing the igniter to the housing, and a resin molding portion for fixing the igniter to the holder. Will be configured.

References disclosing an igniter assembly having the above-described configuration include, for example, Japanese Unexamined Patent Application Publication No. 2003-161599 (Patent Reference 1), Japanese Unexamined Patent Application Publication No. 2004-293835 (Patent Reference 2), and Japanese Unexamined Patent Application Publication No. 2006-234369. No. publication etc. are known. In each of the igniter assemblies disclosed in Patent Documents 1 to 3, the igniter is fixed to the holder by a resin molding portion formed by injection molding.
JP 2003-161599 A JP 2004-293835 A JP 2006-234369 A

  By the way, when the igniter is fixed to the holder by the resin molding part formed by injection molding, at the interface between the resin molding part and the igniter and at the interface between the resin molding part and the holder, respectively. It is necessary to ensure sealing performance in the long term. This is to prevent the gas generating agent accommodated in the housing from absorbing moisture. If the sealing performance at the interface is insufficient, moisture is introduced into the housing through the portion. As a result, the gas generating agent absorbs moisture. If such moisture absorption occurs, there may be a problem that a desired gas output cannot be obtained during operation of the gas generator, and the reliability of the gas generator may be greatly impaired.

  In order to ensure the sealing performance, it is conceivable to secure a long margin for fixing the resin molded portion and the igniter in the axial direction of the holder and for fixing the resin molded portion and the holder. However, in the case of such a configuration, there is a problem that peeling occurs at the interface based on a temperature change during injection molding and in a subsequent use environment due to a difference in linear expansion coefficient between these members. Can occur. If such peeling occurs, conversely, the sealing performance at that portion is significantly lowered, which adversely affects the reliability of the gas generator.

  On the other hand, in order not to cause the above-described peeling problem, if the fixing distance between the resin molding portion and the igniter in the axial direction of the holder and the fixing margin between the resin molding portion and the holder are shortened, ignition of the resin molding portion is performed. The adhesion area with respect to the vessel and the holder is reduced, and there may be a problem that the sealing performance is not sufficiently ensured. Even in this case, the reliability of the gas generator is greatly reduced.

  Thus, in the igniter assembly that employs a structure in which the igniter is fixed to the holder by the resin molding portion formed by injection molding, the interface between the resin molding portion and the igniter and the resin molding There has been a problem that it is very difficult to reliably ensure long-term sealing performance at each of the interfaces between the part and the holder.

  For example, Patent Document 1 discloses an igniter assembly in which a resin molding portion is extended so as to straddle the axial end surface of the holder on the side where the ignition portion of the igniter is disposed and the outer peripheral surface of the holder. It is disclosed. However, in such a configuration, the anchor effect becomes remarkable, and a shrinkage occurs in the resin molded portion toward the outside in the radial direction along with the solidification shrinkage of the resin molded portion at the time of injection molding. The problem that peeling occurs at the interface between the container and the resin molded part may occur.

  Further, in Patent Document 2, an annular protrusion having a height of 0.2 mm to 0.8 mm is provided on the axial end surface of the holder on the side where the ignition part of the igniter is disposed so as to cover the protrusion. An igniter assembly is disclosed in which the entire surface of the axial end surface is covered with a resin molded portion so that the resin molded portion does not reach the outer peripheral surface of the holder. However, when configured in this manner, the anchor effect cannot be sufficiently obtained, the adhesion between the holder and the resin molded portion is lowered, and the sealing performance at the portion becomes insufficient. There is a fear.

  Patent Document 3 discloses an igniter assembly in which a resin molded portion is formed to a height that is flush with the axial end surface of the holder on the side where the igniter of the igniter is disposed. However, in such a configuration, the anchor effect is not obtained at all, the adhesion between the holder and the resin molded part is extremely reduced, and the axis of the outer peripheral surface of the ignition part covered by the resin molded part There is a problem that the margin for fixing in the direction becomes short, and the sealing performance at the portion becomes insufficient.

  As described above, the configurations of the igniter assemblies disclosed in Patent Documents 1 to 3 still have room for improvement when viewed from the viewpoint of ensuring sealing performance.

  The igniter assembly disclosed in Patent Document 2 is configured such that the outer peripheral surface of the resin molding portion and the outer peripheral surface of the holder are flush with each other. When applied to a gas generator, the housing is usually arranged so as to come into contact with the outer peripheral surface of the resin molded part and the holder, so when an external force is applied to the housing, the external force is immediately applied to the resin molded part, There could be a problem that the resin molded part is deformed and the sealing performance is lowered.

  Accordingly, the present invention has been made to solve the above-described problems, and even when a structure in which an igniter is fixed to a holder by a resin molded portion formed by injection molding is used, a seal is formed over a long period of time. It is an object of the present invention to provide an igniter assembly and a gas generator equipped with the igniter assembly that can ensure the reliability.

  The present invention also includes an igniter assembly that is less likely to be damaged in the resin molded part even when a structure in which the igniter is fixed to the holder by a resin molded part formed by injection molding is provided. It aims to be a gas generator.

  In producing an igniter assembly by adopting a structure in which an igniter is fixed to a holder by a resin molding portion formed by injection molding, the inventors of the holder igniter in order to obtain an anchor effect. Set the axial height or depth of the projections or recesses provided on the axial end face on the side where the ignition unit is arranged to an appropriate size, and ignite the axial height or depth of these projections or recesses. The interface between the resin molded part and the holder and the resin by setting the ratio of the resin molded part covering the periphery of the ignition part of the container to the axial height from the axial end surface within the appropriate ratio range It has been found that peeling does not occur at any of the interfaces between the molded part and the ignition part, and appropriate adhesion can be obtained to ensure the sealing performance over a long period of time, thus completing the present invention. .

  Further, the present inventors do not cover the entire surface of the axial end surface of the holder where the igniter of the igniter is disposed, but selectively select only a predetermined position of the resin molded portion formed by injection molding. By adopting the covering structure, it has been found that it is possible to make the resin molded part less likely to be damaged, and the present invention has been completed.

  An igniter assembly according to a first aspect of the present invention includes a substantially cylindrical metal holder including a hollow opening, an igniter disposed in the hollow opening of the holder, the holder, and the igniter. An insulative fluid resin material is poured into the space between the two and solidified, and the igniter is fixed to the holder by being fixed to the surface of the holder and the surface of the igniter. And a resin molded part. The igniter includes an igniter that contains an igniting agent that is ignited during operation, and a terminal pin connected to the igniting unit to ignite the igniting agent. The ignition part is arranged so that a part of the ignition part protrudes outside the one axial end face of the holder. The resin molded portion includes an inner peripheral surface of a portion of the holder facing the ignition portion, an end surface of the one axial direction of the holder, an outer peripheral surface of a portion of the ignition portion facing the holder, and the holder It is fixed at least to the outer peripheral surface of the ignition part at a portion protruding outward from the one axial end surface. The one axial end surface of the holder is located on the inner peripheral edge and covered with the resin molded portion and fixed to the resin molded portion, and is located on the outer peripheral edge and covered with the resin molded portion. It has an exposed region where the resin molded part is not fixed. The to-be-adhered region protrudes from the one axial end surface of the holder in the axial direction, and the height at which the resin molded portion is fixed to the side surface on the outer peripheral side is 1.0 mm or more and 1.5 mm or less. The convex part is included. The height in the axial direction of the resin molded portion of the portion located outside the one axial end surface of the holder is not less than 2 times and not more than 5 times the height of the convex portion.

  In the igniter assembly according to the first aspect of the present invention, it is preferable that the convex portions are provided continuously or scattered in a circumferential shape along the circumferential direction of the holder. .

  An igniter assembly according to a second aspect of the present invention includes a substantially cylindrical metal holder including a hollow opening, an igniter disposed in the hollow opening of the holder, the holder, and the igniter. An insulative fluid resin material is poured into the space between the two and solidified, and the igniter is fixed to the holder by being fixed to the surface of the holder and the surface of the igniter. And a resin molded part. The igniter includes an igniter that contains an igniting agent that is ignited during operation, and a terminal pin connected to the igniting unit to ignite the igniting agent. The ignition part is arranged so that a part of the ignition part protrudes outside the one axial end face of the holder. The resin molded portion includes an inner peripheral surface of a portion of the holder facing the ignition portion, an end surface of the one axial direction of the holder, an outer peripheral surface of a portion of the ignition portion facing the holder, and the holder It is fixed at least to the outer peripheral surface of the ignition part at a portion protruding outward from the one axial end surface. The one axial end surface of the holder is located on the inner peripheral edge and covered with the resin molded portion and fixed to the resin molded portion, and is located on the outer peripheral edge and covered with the resin molded portion. It has an exposed region where the resin molded part is not fixed. The to-be-adhered region is recessed from the one axial end surface of the holder in the axial direction, and has a depth of 1.0 mm or more and 1.5 mm, wherein the resin molded portion is fixed to the inner peripheral side surface. The following recesses are included. The height in the axial direction of the resin molded portion of the portion located outside the one axial end surface of the holder is not less than 1 and not more than 4 times the depth of the recess.

  In the igniter assembly according to the second aspect of the present invention, it is preferable that the recesses are provided continuously or dotted in a circumferential shape along the circumferential direction of the holder.

  A gas generator according to the present invention includes any one of the above-described igniter assemblies, a housing in which the igniter assembly is assembled, and a gas generating agent accommodated in the housing.

  According to the present invention, even when a structure in which an igniter is fixed to a holder by a resin molding portion formed by injection molding is employed, an igniter assembly capable of reliably ensuring sealing performance over a long period of time and the igniter assembly. It can be set as the gas generator provided with.

  Further, according to the present invention, even when a structure in which the igniter is fixed to the holder by the resin molding portion formed by injection molding is adopted, the igniter assembly which is less likely to be damaged in the resin molding portion and the The gas generator can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the igniter assembly in the embodiment of the present invention will be described first, and then the gas generator in the embodiment of the present invention incorporating the igniter assembly will be described. I will do it.

(Embodiment 1)
1 is a cross-sectional view of an igniter assembly according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing the shape of the holder of the igniter assembly shown in FIG.

  As shown in FIG. 1, the igniter assembly 1 </ b> A in the present embodiment includes a holder 10, an igniter 20, and a resin molding portion 30. The holder 10 has a hollow opening 11 extending in the axial direction, and the igniter 20 disposed in the hollow opening 11 is provided so as to fill a space between the holder 10 and the igniter 20. The igniter assembly 1 </ b> A is configured by being fixed to the holder 10 by the resin molding portion 30.

  The igniter 20 is an ignition device for generating a flame, and includes an ignition unit 21 and a terminal pin 22. The ignition unit 21 includes an igniting agent that ignites during operation and a resistor for burning the igniting agent. The terminal pin 22 is connected to the ignition unit 21 in order to ignite the igniting agent. More specifically, the igniter 20 includes a base portion through which a pair of terminal pins 22 are inserted and held, and a squib cup attached to the base portion, and the tip of the terminal pin 22 inserted into the squib cup. A resistor (bridge wire) is attached so as to connect the squib cups, and an igniting agent is filled in the squib cup so as to surround the resistor or in contact with the resistor. The squib cup forms an outer peripheral surface 21a and a top surface of the ignition unit 21, and is generally formed of a metal or plastic member.

  When a collision is detected, a predetermined amount of current flows through the resistor via the terminal pin 22. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and the ignition powder starts to burn upon receiving this heat. 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 20 is activated is 3 milliseconds or less when a nichrome wire is used as the resistor.

  As described above, the holder 10 is configured by a cylindrical member having a hollow opening 11 extending in the axial direction, and is formed by a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy, for example. ing. The inner peripheral surface 10a that defines the hollow opening 11 of the holder 10 is formed in a curved shape so that the inner diameter of the hollow opening 11 changes smoothly in the axial direction. One axial end face 12 of the holder 10 is provided with a convex portion 13 projecting in the axial direction. This convex part 13 is provided in the inner periphery of the said axial direction end surface 12, The axial direction height h1 is 1.0 mm or more and 1.5 mm or less.

  As shown in FIG. 2, the convex portion 13 provided on the axial end surface 12 of the holder 10 is provided circumferentially along the circumferential direction of the holder 10. In the holder 10 shown in FIG. 2A, the convex portion 13 is continuously provided in a circumferential shape along the circumferential direction of the holder 10, and the convex portion 13 has an annular form. On the other hand, in the holder 10 shown in FIG. 2 (B), the convex portions 13 are intermittently arranged in the circumferential direction along the circumferential direction of the holder 10 (that is, the individual convex portions 13 are scattered in the circumferential shape. ). As the holder 10 used in the igniter assembly 1A in the present embodiment, any one of these forms shown in FIG. 2 (A) and FIG. 2 (B) may be adopted.

  As shown in FIG. 1, the igniter 20 is arranged such that a part of the igniter 21 protrudes outward from the axial end surface 12 of the holder 10. That is, a portion near the bottom surface of the ignition unit 21 to which the terminal pin 22 is connected is located inside the hollow opening 11 of the holder 10, and a portion near the top surface of the ignition unit 21 to which the terminal pin 22 is not connected is the holder. It arrange | positions so that it may protrude and protrude outside the 10 hollow openings 11. FIG.

  As described above, the resin molding part 30 is positioned so as to fill the space between the igniter 20 disposed in the hollow opening 11 of the holder 10 and the holder 10. The resin molding part 30 includes a filling part 31 and a protruding part 32. The filling portion 31 corresponds to a portion of the resin molding portion 30 located inside the hollow opening 11 of the holder 10, and the outer peripheral surface near the bottom surface of the inner peripheral surface 10 a of the holder 10 and the ignition portion 21 of the igniter 20. Each is fixed to 21a. Further, the protruding portion 32 corresponds to a portion of the resin molded portion 30 located outside the hollow opening 11 of the holder 10, and the axial end surface 12 of the holder 10 and the top surface of the ignition portion 21 of the igniter 20. They are fixed to the outer peripheral surface 21a.

  The filling portion 31 near the axial end surface located on the opposite side of the axial end surface 12 of the holder 10 is provided with a recess 33 that is recessed in the axial direction. The terminal pin 22 of the igniter 20 is exposed in the recess 33. The recess 33 is a female connector (not shown) to which a male connector of a harness that transmits a signal from a collision detection sensor is connected to the gas generator after the igniter assembly 1A is incorporated into the gas generator. Is installed.

  The resin molding part 30 is formed by pouring an insulating fluid resin material into the space between the holder 10 and the igniter 20 and solidifying it. That is, the resin molding part 30 is formed by injection molding (more specifically, insert molding). As a raw material of the resin molding part 30 formed by injection molding, a resin material excellent in heat resistance, durability, corrosion resistance and the like after curing is suitably selected and used. In that case, it is not limited to a thermosetting resin typified by an epoxy resin or the like, but is typified by a polybutylene terephthalate resin, a polyethylene terephthalate resin, a polyamide resin (for example, nylon 6 or nylon 66), a polypropylene sulfide resin, or a polypropylene oxide resin. It is also possible to use a thermoplastic resin. When these thermoplastic resins are selected as raw materials, it is preferable to contain glass fibers or the like as fillers in these resin materials in order to ensure the mechanical strength of the resin molded portion 30 after molding. However, when sufficient mechanical strength can be ensured with only the thermoplastic resin, it is not necessary to add the filler as described above.

  The protrusion part 32 which is a part of the resin molding part 30 is formed so as to cover the axial end face 12 of the holder 10 as described above. Here, the protruding portion 32 does not cover the entire surface of the axial end surface 12 of the holder 10, and covers the inner peripheral side portion of the axial end surface 12. In other words, the axial end surface 12 of the holder 10 is covered by the protruding portion 32 of the resin molded portion 30, and the fixed region S <b> 1 to which the protruding portion 32 of the resin molded portion 30 is fixed and the protruding portion 32 of the resin molded portion 30. And an exposed region S2 that is exposed without being covered. The to-be-adhered region S1 is located at a portion near the inner peripheral edge of the axial end surface 12 of the holder 10, and the exposed region S2 is located at a portion near the outer peripheral edge of the axial end surface 12 of the holder 10.

  The convex portion 13 provided on the axial end surface 12 of the holder 10 is provided in the fixed region S1. Therefore, the convex portion 13 is completely covered by the protruding portion 32 of the resin molded portion 30. Therefore, the protruding portion 32 of the resin molding portion 30 is fixed to the side surface 13 a on the outer peripheral side of the convex portion 13.

  The protruding portion 32 that is a part of the resin molded portion 30 has an axial height H from the axial end surface 12 of the holder 10 that is not less than 2 times and not more than 5 times the axial height h1 of the convex portion 13. It is set. That is, the axial height of the protruding portion 32 of the resin molded portion 30 is set based on the axial height h1 of the convex portion 13, and the height is at least 2.0 mm (h1 = 1.0 mm and the ratio is 2 times) and 7.5 mm at the maximum (when h1 = 1.5 mm and the ratio is 5 times).

  By using the igniter assembly 1A having the above-described configuration, a convex portion having a height of 1.0 mm to 1.5 mm provided on the axial end surface 12 of the holder 10 on the side where the igniter 21 of the igniter 20 is disposed. Since the resin molding part 30 is provided so as to cover 13, an appropriate anchor effect can be obtained. Therefore, adhesion at the interface between the resin molded portion 30 and the holder 10 is ensured, and the sealing performance at the portion is reliably maintained over a long period of time.

  Moreover, by setting it as the igniter assembly 1A of said structure, the protrusion height from the said axial direction end surface 12 of the protrusion part 32 of the resin molding part 30 is 2-5 times the height of the said convex part 13. FIG. Therefore, the degree of sinking toward the radially outer side of the resin molded part 30 due to solidification shrinkage during injection molding is suppressed to a low level, and the ignition part 21 and the resin molded part of the igniter 20 are suppressed. There is no possibility of peeling at the boundary portion between the two. Moreover, if it does in this way, generation | occurrence | production of peeling in the said part based on the temperature change in use environment can also be prevented. Furthermore, a sufficient margin for axial fixation between the ignition part 21 of the igniter 20 and the resin molding part 30 is also ensured. Therefore, the sealing performance in the part is reliably maintained over a long period of time.

  Thus, by using the igniter assembly 1A having the above-described configuration, peeling occurs at any of the interface between the resin molded part 30 and the holder 10 and the interface between the resin molded part 30 and the ignition part 21. In addition, it is possible to obtain an igniter assembly that can obtain an appropriate adhesion and can ensure a sealing property over a long period of time.

  Further, in the above-described igniter assembly 1 </ b> A, since the exposed region S <b> 2 is formed near the outer peripheral edge of the axial end surface 12 of the holder 10, the outer peripheral surface of the protruding portion 32 of the resin molding portion 30 is the holder 10. Instead of being flush with the outer peripheral surface, the holder 10 is disposed at a position retracted inward from the outer peripheral surface of the holder 10. Therefore, even when the igniter assembly 1A is incorporated in a cylinder-type gas generator, the housing does not directly contact the outer peripheral surface of the resin molded portion 30. Therefore, even when an external force is applied to the housing, the igniter assembly in which the resin molded portion 30 is hardly damaged can be obtained.

(Embodiment 2)
FIG. 3 is a cross-sectional view of an igniter assembly according to Embodiment 2 of the present invention. FIG. 4 is a perspective view showing the shape of the holder of the igniter assembly shown in FIG. Since the igniter assembly in the present embodiment is similar in configuration to the igniter assembly in the first embodiment described above, the same reference numerals are given to the same parts in the drawing, and the description thereof is as follows. It will not be repeated here.

  As shown in FIG. 3, the igniter assembly 1 </ b> B in the present embodiment includes a holder 10, an igniter 20, and a resin molding portion 30, similar to the igniter assembly 1 </ b> A in the first embodiment described above. Contains. The holder 10 has a hollow opening 11 extending in the axial direction, and the igniter 20 disposed in the hollow opening 11 is provided so as to fill a space between the holder 10 and the igniter 20. The igniter assembly 1 </ b> B is configured by being fixed to the holder 10 by the resin molding portion 30.

  One axial end face 12 of the holder 10 is provided with a recess 14 that is recessed in the axial direction. The concave portion 14 is provided in a portion near the inner peripheral edge of the axial end face 12, and the axial depth h2 is 1.0 mm or more and 1.5 mm or less.

  As shown in FIG. 4, the recess 14 provided in the axial end surface 12 of the holder 10 is provided in a circumferential shape along the circumferential direction of the holder 10. In the holder 10 shown in FIG. 4A, the concave portion 14 is continuously provided in a circumferential shape along the circumferential direction of the holder 10, and the concave portion 14 has an annular shape. On the other hand, in the holder 10 shown in FIG. 4 (B), the recesses 14 are intermittently arranged in the circumferential direction along the circumferential direction of the holder 10 (that is, the individual recesses 14 are scattered in the circumferential shape). Is provided. As the holder 10 used in the igniter assembly 1B in the present embodiment, the holder 10 in any of the forms shown in FIGS. 4 (A) and 4 (B) may be adopted.

  The protrusion part 32 which is a part of the resin molding part 30 is formed so as to cover the axial end face 12 of the holder 10 as described above. Here, the protruding portion 32 does not cover the entire surface of the axial end surface 12 of the holder 10, and covers the inner peripheral side portion of the axial end surface 12. In other words, the axial end surface 12 of the holder 10 is covered by the protruding portion 32 of the resin molded portion 30, and the fixed region S <b> 1 to which the protruding portion 32 of the resin molded portion 30 is fixed and the protruding portion 32 of the resin molded portion 30. And an exposed region S2 that is exposed without being covered. The to-be-adhered region S1 is located at a portion near the inner peripheral edge of the axial end surface 12 of the holder 10, and the exposed region S2 is located at a portion near the outer peripheral edge of the axial end surface 12 of the holder 10.

  The concave portion 14 provided in the axial end surface 12 of the holder 10 is provided in the fixed region S1. Therefore, the concave portion 14 is completely embedded by the protruding portion 32 of the resin molded portion 30. Therefore, the protruding portion 32 of the resin molded portion 30 is fixed to the side surface 14 a on the inner peripheral side of the concave portion 14.

  The protruding portion 32 which is a part of the resin molded portion 30 is set so that the axial height H from the axial end surface 12 of the holder 10 is 1 to 4 times the axial depth h2 of the recess 14. Has been. That is, the axial height of the protruding portion 32 of the resin molded portion 30 is set based on the axial depth h2 of the concave portion 14, and the height is 1.0 mm at the minimum (h1 = 1.0 mm and the ratio is 1). 2 times) and a maximum of 6.0 mm (when h1 = 1.5 mm and the ratio is 4 times).

  By using the igniter assembly 1B having the above-described configuration, the same effects as those described in the first embodiment can be obtained. That is, peeling does not occur at any of the interface between the resin molded part 30 and the holder 10 and the interface between the resin molded part 30 and the ignition part 21, and appropriate adhesion can be obtained, resulting in long-term sealing performance. In addition, the igniter assembly can be surely ensured over the entire length, and the igniter assembly can be hardly damaged even when an external force is applied to the housing.

(Embodiment 3)
FIG. 5 is a sectional view of a disk-type gas generator according to Embodiment 3 of the present invention. The disk-type gas generator in the present embodiment is a gas generator that includes the igniter assembly in the first embodiment of the present invention described above, such as an airbag device for a driver's seat installed in a steering wheel. The gas generator is preferably incorporated into the gas generator.

  As shown in FIG. 5, the disk-type gas generator 100 in the present embodiment has a short cylindrical housing in which both axial ends are closed. The short cylindrical housing is formed by an initiator shell 110 and a closure shell 120 formed in a bottomed cylindrical shape, and a holder 10 of an igniter assembly 1A assembled to the initiator shell 110. Each of the initiator shell 110 and the closure shell 120 is made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy. For joining the initiator shell 110 and the closure shell 120, electron beam welding, laser welding, friction welding, or the like is preferably used.

  The igniter assembly 1A is assembled to the initiator shell 110 as described above. More specifically, the igniter assembly 1A is inserted from the inside into an opening provided at a substantially central portion of the bottom plate portion of the initiator shell 110, and the holder 10 of the inserted igniter assembly 1A is attached to the initiator shell. By joining to 110, the igniter assembly 1A is fixed to the housing. Here, the igniter assembly 1A is assembled so that the igniter of the igniter 20 is positioned inside the housing. Electron beam welding, laser welding, friction welding, resistance welding, or the like is suitably used for joining the holder 10 and the initiator shell 110 of the igniter assembly 1A.

  A bottomed cylindrical enhancer cup 130 is fixed to the igniter assembly 1 </ b> A so as to cover the ignition part of the igniter 20. The enhancer cup 130 has a fire transfer chamber 134 in which a charge transfer agent 135 is accommodated therein, and the holder 10 of the igniter assembly 1 </ b> A so that the heat transfer chamber 134 faces the ignition part of the igniter 20. Extrapolated and fixed to More specifically, the enhancer cup 130 is fixed to the igniter assembly 1 </ b> A by caulking the flange 131 provided on the enhancer cup 130 by the caulking portion 16 provided on the holder 10. The enhancer cup 130 has an opening 132 in the peripheral wall portion, and a seal member 133 is affixed to the enhancer cup 130 so as to close the opening 132. As the seal member 133, an aluminum foil or the like having an adhesive member applied on one side is used.

  A combustion chamber 140 in which the gas generating agent 141 is accommodated is located in a space surrounding the portion where the enhancer cup 130 is arranged in a space inside the housing including the initiator shell 110 and the closure shell 120. . Further, a filter 150 is disposed along the inner periphery of the housing in a space surrounding the combustion chamber 140 in which the gas generating agent 141 is accommodated. The filter 150 has a cylindrical shape, and the central axis thereof is disposed so as to substantially coincide with the axial direction of the housing. As the filter 150, for example, a wire made of a metal such as stainless steel or steel, a wire wound around a mesh, or a material pressed by pressing is used. Specifically, a knitted wire mesh, a plain weave wire mesh, an assembly of crimped metal wires, or the like is used.

  A plurality of gas outlets 121 are provided on the peripheral wall of the closure shell 120 that faces the filter 150. A seal member 122 is affixed to a main surface located on the filter 150 side of the peripheral wall portion of the closure shell 120 so as to close the gas ejection port 121. As the sealing member 122, an aluminum foil or the like having an adhesive member applied on one side is used.

  To prevent the residue from flowing out from the gap between the filter 150 and the closure shell 120 without passing through the filter 150 at the end of the combustion shell 140 on the top plate side of the closure shell 120. The residue outflow prevention member 152 is disposed. On the other hand, at the end of the combustion chamber 140 on the bottom plate side of the initiator shell 110, the residue is prevented from flowing out from the gap between the filter 150 and the initiator shell 110 without passing through the filter 150. The residue outflow prevention member 154 for this is arrange | positioned. As these residue outflow prevention members 152 and 154, steel plates such as ordinary steel and special steel are used. A cushion material 153 is disposed inside the residue outflow prevention member 152 so as to come into contact with the gas generating agent 141 accommodated in the combustion chamber 140. The cushion material 153 is provided for the purpose of preventing the gas generating agent 141 made of a molded body from being pulverized by vibration or the like, and a ceramic fiber molded body, silicon foam, or the like is preferably used.

  The disk-type gas generator 100 having the above configuration generates gas when the igniter 20 assembled to the igniter assembly 1A is operated. Specifically, the transfer agent 135 accommodated in the transfer chamber 134 is ignited and burned by the flame generated by the operation of the igniter 20, and generates a large amount of heat particles. The generated heat particles break the seal member 133 and flow into the combustion chamber 140, and the gas generating agent 141 accommodated in the combustion chamber 140 is burned to generate a large amount of working gas. The working gas generated in the combustion chamber 140 passes through the filter 150. At that time, heat is taken away by the filter 150 and cooled, and the residue contained in the working gas is removed by the filter 150, so that the outer peripheral edge of the housing. Flow into the department. The working gas that has reached the outer peripheral edge of the housing breaks the seal member 122 and is ejected from the gas ejection port 121 to the outside of the housing. The ejected gas is introduced into an airbag provided adjacent to the disk-type gas generator 100, and the airbag is inflated and deployed.

  With the disc-type gas generator 100 as described above, the gas-generating agent 141 does not absorb moisture because the sealing performance is ensured for a long period of time, and the desired gas output can be obtained. It can be a generator. In the present embodiment, the disk-type gas generator 100 having the structure in which the igniter assembly 1A according to the first embodiment of the present invention is incorporated is described as an example. It is also possible to incorporate the igniter assembly 1B according to the second embodiment of the invention into a disk type gas generator.

(Embodiment 4)
FIG. 6 is a cross-sectional view of a cylinder type gas generator according to Embodiment 4 of the present invention. The cylinder type gas generator in the present embodiment is a gas generator including the igniter assembly in the first embodiment of the present invention described above, and is suitable for a side airbag device, a curtain airbag device, or the like. It is a built-in gas generator.

  As shown in FIG. 6, the cylinder type gas generator 200 in the present embodiment has a long cylindrical housing that is closed at both ends in the axial direction. The long cylindrical housing includes a cylindrical member 210 having both ends opened, a closing member 220 assembled to the cylindrical member 210 so as to close an opening on one end side of the cylindrical member 210, and the cylindrical member 210. It is formed by the holder 10 of the igniter assembly 1A assembled to the cylindrical member 210 so as to close the opening on the other end side. The cylindrical member 210 and the closing member 220 are each formed of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy. Part of the closing member 220 is inserted into the opening on one end side of the cylindrical member 210, and the cylindrical member 210 corresponding to the portion where the closing member 220 is inserted is directed radially inward. The closing member 220 is fixed to the cylindrical member 210 by being caulked.

  The igniter assembly 1A is assembled to the cylindrical member 210 as described above. More specifically, the igniter assembly 1A is partially inserted in the opening on the other end side of the cylindrical member 210, and corresponds to a portion where the igniter assembly 1A is inserted. The igniter assembly 1 </ b> A is fixed to the cylindrical member 210 by caulking the partial cylindrical member 210 toward the radially inner side. Here, a circumferentially extending groove 17 is provided on the outer peripheral surface of the holder 10 of the igniter assembly 1A, and an O-ring 238 is fitted into the groove 17 as a seal member.

  A bottomed cylindrical enhancer cup 230 is fixed to the igniter assembly 1 </ b> A so as to cover the ignition part of the igniter 20. The enhancer cup 230 has a heat transfer chamber 234 in which a charge transfer agent 235 is accommodated, and the holder 10 of the igniter assembly 1 </ b> A so that the heat transfer chamber 234 faces the ignition part of the igniter 20. It is fixed to. More specifically, the enhancer cup 230 is fixed to the igniter assembly 1 </ b> A by caulking the flange portion 231 provided on the enhancer cup 230 by the caulking portion 15 provided on the axial end surface of the holder 10. . A score as a fragile portion is formed on the top wall portion of the enhancer cup 230 as necessary.

  A cushion material 253 is inserted inside the cylindrical member 210. The cushion material 253 is inserted into the cylindrical member 210 so as to contact the top wall portion of the enhancer cup 230 described above. The cushion material 253 partitions the space inside the cylindrical member 210 into an ignition chamber 244 and a combustion chamber 240. A gas generating agent 241 is accommodated in the combustion chamber 240. The cushion material 253 is provided for the purpose of preventing the gas generating agent 241 made of a molded body from being pulverized by vibration or the like, and a ceramic fiber molded body, silicon foam, or the like is preferably used.

  A partition member 245 is inserted and fixed inside the cylindrical member 210. The partition member 245 clamps the peripheral edge of the partition member 245 in the axial direction by caulking the cylindrical member 210 of the portion adjacent to the portion where the partition member 245 is inserted toward the inside in the radial direction. Is fixed to the cylindrical member 210. The partition member 245 partitions the space inside the cylindrical member 210 into a combustion chamber 240 and a filter chamber 242. The partition member 245 is configured by a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy.

  The partition member 245 has a communication hole 246 at the center thereof. A seal member 247 is affixed to the main surface of the partition member 245 located on the combustion chamber 240 side so as to close the communication hole 246. As the sealing member 247, an aluminum foil or the like having an adhesive member applied on one side is used. A perforated plate 248 having a plurality of holes 249 is inserted at the end of the combustion chamber 240 on the side where the partition member 245 is located. The perforated plate 248 rectifies the flow of gas released from the combustion chamber 240 during operation and prevents the gas generating agent 241 stored in the combustion chamber 240 from moving to the filter chamber 242 in an unburned state. Is for.

  A filter 250 is accommodated in the filter chamber 242. The filter 250 is made of a cylindrical member having a hollow opening 251 extending in the same direction as the axial direction of the cylindrical member 210. The filter 250 is made of, for example, a wire or net made of a metal such as stainless steel or steel, or one that is pressed and hardened by pressing. Specifically, a knitted wire mesh, a plain weave wire mesh, an assembly of crimped metal wires, or the like is used. A plurality of gas outlets 221 are provided on the peripheral wall portion of the cylindrical member 210 facing the filter 250.

  The cylinder type gas generator 200 configured as described above generates gas when the igniter 20 assembled to the igniter assembly 1A is operated. Specifically, the transfer charge 235 accommodated in the transfer chamber 234 is ignited and burned by the flame generated by the operation of the igniter 20 to generate a large amount of heat particles. The generated heat particles open the enhancer cup 230 and flow into the combustion chamber 240, and burn the gas generating agent 241 stored in the combustion chamber 240 to generate a large amount of working gas. The working gas generated in the combustion chamber 240 breaks the seal member 247 and flows into the filter chamber 242 and passes through the filter 250. At this time, heat is taken away by the filter 250, and the working gas is cooled. The contained residue is removed by the filter 250 and flows into the outer peripheral edge of the housing corresponding to the filter chamber 242. The working gas that has reached the outer peripheral edge of the housing corresponding to the filter chamber 242 is ejected to the outside of the housing via the gas ejection port 221. The jetted gas is introduced into an airbag provided adjacent to the cylinder type gas generator 200, and the airbag is inflated and deployed.

  If the cylinder type gas generator 200 as described above is used, the cylinder type gas that can ensure the sealing performance for a long period of time and does not absorb moisture in the gas generating agent 241 and can obtain a desired gas output. It can be a generator. Further, if the above configuration is adopted, the outer peripheral surface of the protruding portion of the resin molding portion 30 of the igniter assembly 1A is not directly in contact with the inner peripheral surface of the cylindrical member 210 which is a part of the housing. Even when an external force is applied to the resin, there is no possibility that the resin molding portion 30 is damaged and the sealing performance is not impaired. In the present embodiment, the cylinder-type gas generator 200 having the structure in which the igniter assembly 1A according to the first embodiment of the present invention is incorporated is described as an example. It is also possible to incorporate the igniter assembly 1B in the second embodiment of the invention into a cylinder type gas generator.

(Embodiment 5)
FIG. 7 is a cross-sectional view of the micro gas generator in the fifth embodiment of the present invention. The micro gas generator according to the present embodiment is a gas generator including the igniter assembly according to the first embodiment of the present invention described above, and is preferably incorporated in a seat belt pretensioner or the like. It is.

  As shown in FIG. 7, the micro gas generator 300 in the present embodiment has a housing constituted by a bottomed cylindrical cup-shaped member 310 and the holder 10 of the igniter assembly 1A. . The cup-shaped member 310 has a combustion chamber 340 in which a gas generating agent 341 is accommodated, and the holder 10 of the igniter assembly 1 </ b> A so that the combustion chamber 340 faces the ignition part of the igniter 20. It is fixed to. More specifically, the flange portion 314 provided on the cup-shaped member 310 is caulked by the caulking portion 19 provided on the outer peripheral portion of the holder 10, whereby the cup-shaped member 310 is fixed to the igniter assembly 1A. Yes. A score as a fragile portion is formed on the outer surface of the cup-shaped member 310 as necessary. The cup-shaped member 310 is composed of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy.

  The micro gas generator 300 configured as described above generates gas when the igniter 20 assembled to the igniter assembly 1A is operated. Specifically, the gas generating agent 341 housed in the combustion chamber 340 is ignited and burned by a flame generated by the operation of the igniter 20, and a large amount of working gas is generated. The working gas generated in the combustion chamber 340 opens the cup-shaped member 310 and is ejected to the outside of the housing. The jetted gas is introduced into the working space of the seat belt pretensioner in which the micro gas generator is incorporated, and is used for the seat belt winding operation.

  If the micro gas generator 300 as described above is used, the gas generating agent 341 does not absorb moisture because the sealing property is surely ensured for a long period of time, and a desired gas output can be obtained. -It can be a generator. In the present embodiment, the micro gas generator 300 having the structure incorporating the igniter assembly 1A according to the first embodiment of the present invention has been described as an example. It is also possible to incorporate the igniter assembly 1B according to the second embodiment of the invention into a micro gas generator.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It is not restrictive. The technical scope of the present invention is defined by the claims for utility model registration, and includes all modifications within the meaning and scope equivalent to the description of the claims for utility model registration.

It is sectional drawing of the igniter assembly in Embodiment 1 of this invention. It is a perspective view which shows the shape of the holder of the igniter assembly shown in FIG. It is sectional drawing of the igniter assembly in Embodiment 2 of this invention. It is a perspective view which shows the shape of the holder of the igniter assembly shown in FIG. It is sectional drawing of the disk type gas generator in Embodiment 3 of this invention. It is sectional drawing of the cylinder type gas generator in Embodiment 4 of this invention. It is sectional drawing of the micro gas generator in Embodiment 5 of this invention.

Explanation of symbols

  1A, 1B igniter assembly, 10 holder, 10a inner surface, 11 hollow opening, 12 top surface, 13 convex portion, 13a outer peripheral side surface, 14 concave portion, 14a (recessed portion) ) Inner peripheral side, 15, 16, 19 caulking portion, 17 groove, 20 igniter, 21 ignition portion, 21a (ignition portion) outer peripheral surface, 22 terminal pin, 30 resin molding portion, 31 filling portion, 32 Projection, 33 Concave, 100 Disc type gas generator, 110 Initiator shell, 120 Closure shell, 121 Gas outlet, 122 Seal member, 130 Enhancer cup, 131 Flange, 132 Opening, 133 Seal member, 134 Heat transfer chamber 135 Transfer powder, 140 Combustion chamber, 141 Gas generating agent, 150 Filter, 152 Residue outflow prevention member, 153 Cushion Material, 154 Residue outflow prevention member, 200 Cylinder type gas generator, 210 Cylindrical member, 211 Gas outlet, 220 Closure member, 230 Enhancer cup, 231 Flange part, 234 Fire transfer chamber, 235 Fire transfer agent, 238 O-ring, 240 Combustion chamber, 241 Gas generating agent, 242 Filter chamber, 244 Ignition chamber, 245 Partition member, 246 Communication hole, 247 Seal member, 248 Porous plate, 249 Hole, 250 Filter, 251 Hollow opening, 253 Cushion material, 300 Micro Gas generator, 310 cup-shaped member, 314 flange portion, 340 combustion chamber, 341 gas generating agent, S1 adherence area, S2 exposed area.

Claims (5)

A substantially cylindrical metal holder including a hollow opening;
An igniter disposed in the hollow opening of the holder;
An insulating fluid resin material is poured into the space between the holder and the igniter to solidify the material, and the igniter is fixed to the surface of the holder and the surface of the igniter. An igniter assembly including a resin molding portion for fixing the holder to the holder,
The igniter includes an igniter that contains an igniting agent that ignites during operation, and a terminal pin connected to the igniting unit to ignite the igniting agent,
The ignition part is disposed so that a part thereof protrudes outside the one axial end face of the holder,
The resin molded portion includes an inner peripheral surface of a portion of the holder that faces the ignition portion, an end surface in the one axial direction of the holder, an outer peripheral surface of a portion of the ignition portion that faces the holder, and the holder At least fixed to the outer peripheral surface of the ignition portion of the portion protruding outward from the one axial end surface,
The one axial end face of the holder is located on the inner peripheral side and is covered by the resin molding part and fixed to the fixed part, and is located on the outer peripheral side and covered by the resin molding part. It has an exposed area where the resin molded part is not fixed,
The fixed region is provided so as to protrude from the one axial end surface of the holder in the axial direction, and the resin molded portion is fixed to a side surface on the outer peripheral side. Including the convex part of
The igniter assembly, wherein an axial height of the resin molding portion of a portion located outside the one axial end face of the holder is not less than 2 times and not more than 5 times the height of the convex portion.   2. The igniter assembly according to claim 1, wherein the convex portions are provided continuously or scattered in a circumferential shape along a circumferential direction of the holder. A substantially cylindrical metal holder including a hollow opening;
An igniter disposed in the hollow opening of the holder;
An insulating fluid resin material is poured into a space between the holder and the igniter to solidify the material, and the igniter is fixed to the surface of the holder and the surface of the igniter. An igniter assembly including a resin molding portion for fixing the holder to the holder,
The igniter includes an igniter that contains an igniter that ignites during operation, and a terminal pin connected to the igniter to ignite the igniter,
The ignition part is arranged so that a part thereof protrudes outside the one axial end face of the holder,
The resin molding portion includes an inner peripheral surface of a portion of the holder facing the ignition portion, an end surface in the one axial direction of the holder, an outer peripheral surface of a portion of the ignition portion facing the holder, and the holder At least fixed to the outer peripheral surface of the ignition portion of the portion protruding outward from the one axial end surface,
The one axial end surface of the holder is located on the inner peripheral side and covered with the resin molding part and fixed to the fixed part, and located on the outer peripheral side and covered with the resin molding part. It has an exposed area where the resin molded part is not fixed,
The to-be-adhered region is recessed from the one axial end surface of the holder in the axial direction, and a depth of 1.0 mm to 1.5 mm formed by fixing the resin molded portion to the side surface on the inner peripheral side. Including the following recesses,
The igniter assembly, wherein an axial height of the resin molding portion of a portion located outside the one axial end face of the holder is 1 to 4 times the depth of the recess.   4. The igniter assembly according to claim 3, wherein the recesses are provided continuously or scattered in a circumferential shape along a circumferential direction of the holder. 5. An igniter assembly according to any of claims 1 to 4,
A housing in which the igniter assembly is assembled;
A gas generator comprising a gas generating agent housed in the housing.

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