JP2009286264A - Gas generator and filter for gas generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas generator capable of easily assembling a filter constituted of a laminated body of hook metal even if using the filter, and suppressing manufacturing cost low. <P>SOLUTION: This gas generator 1A has a short cylindrical housing including an initiator shell 20 and a closure shell 30 and is provided with a combustion chamber 50 and the filter 60 therein. A gas generating agent 51 is stored in the combustion chamber 50. The filter 60 is arranged in the housing and has a hollow cylindrical shape to surround the combustion chamber 50. The filter 60 is constituted of the laminated body laminated by winding a metallic plate type member having a plurality of openings 62 on peripheral edges of which the projected parts are formed, held from the axial direction by the initiator shell 20 and the closure shell 30 and fixed. A bent part 64 to deform to reduce contour dimensions in the axial direction of the filter 60 when fixed is provided ar an end in the axial direction of the filter 60. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gas generator incorporated in an occupant protection device and a gas generator filter used therefor.

  2. Description of the Related Art Conventionally, airbag devices, which are occupant protection devices, have been widely used from the viewpoint of protecting occupants such as automobiles. The airbag device is equipped for the purpose of protecting the occupant from the impact caused by the collision of the vehicle or the like. By inflating and deploying the airbag instantaneously at the time of the collision of the vehicle or the like, the airbag functions as a cushion of the occupant. It is to catch the body. The gas generator is incorporated in the airbag device, ignites an igniter (squib) by energization from the control unit at the time of a vehicle collision or the like, and burns a gas generating agent by a flame generated in the igniter to generate a large amount of combustion gas. It is a device that instantly generates and thereby inflates and deploys an airbag.

  There are various types of gas generators. In particular, a so-called disk-type gas generator is used as a gas generator preferably used for a driver side airbag device installed in a steering wheel of an automobile. There is. A disk-type gas generator has a short cylindrical housing closed at both ends in the axial direction, a gas outlet is provided on the peripheral wall of the housing, and a gas generating agent, an igniter, and the like are accommodated inside the housing. It will be. In this disk-type gas generator, it is general that a filter is accommodated in the housing so as to surround a combustion chamber in which a gas generating agent is accommodated. The filter functions as a means for collecting the residue (slag) contained in the combustion gas, and also functions as a cooling means for reducing the temperature of the combustion gas by passing through the inside.

There are various types of filters described above. For example, a filter formed by winding a metal plate-like member (generally referred to as a hook metal) having a plurality of openings having protrusions formed on the periphery is known (for example, Japanese Patent Application Laid-Open No. 2005-260260). 2002-249017 gazette (patent document 1 reference). In the filter formed by winding the hook metal, the protrusions are positioned between the stacked layers, and the gaps between the layers stacked by the protrusions. Part is formed. The gap portion and the above-described opening portion form a labyrinth flow path that connects the inner space and the outer space of the filter, and the combustion gas flows through the flow path. Thus, cooling of the combustion gas and collection of slag contained in the combustion gas are realized.
JP 2002-249017 A

  By the way, the filter described above is generally assembled to the housing by being sandwiched between the top plate portion and the bottom plate portion of the housing of the gas generator from the axial direction. The assembly structure is most suitable from the viewpoint of stably fixing the filter to the housing and preventing the combustion gas from leaking from the gap between the filter and the housing. In this case, the end face in the axial direction of the filter is brought into pressure contact with the top plate portion and the bottom plate portion of the housing at an appropriate pressure.

  The filter formed by winding the hook metal described above has a characteristic that the rigidity in the axial direction is high and it does not easily deform in the axial direction. Therefore, in order to assemble the filter formed by winding the hook metal in a state of being in pressure contact with the housing of the gas generator at an appropriate pressure, the outer dimensions of the filter and the housing are managed with high accuracy. Need arises. However, such high-accuracy dimensional management not only causes the problem that the yield deteriorates, but also causes the problem of pressing the manufacturing cost, and requires improvement.

  Therefore, the present invention provides a gas generator that can be easily assembled and reduced in manufacturing cost even when a filter composed of a hook metal laminate is used, and a gas generator filter used therefor. The purpose is to provide.

  A gas generator according to the present invention includes a housing, ignition means, and a filter. The housing is composed of a top plate portion and a bottom plate portion that close both ends in the axial direction, and a peripheral wall portion provided with a gas outlet, and is a short cylindrical shape including a combustion chamber containing a gas generating agent therein. It has a shape. The ignition means is attached to the bottom plate portion so as to face the combustion chamber. The filter is disposed inside the housing and has a hollow cylindrical shape surrounding the combustion chamber in the radial direction of the housing. The filter is composed of a laminate having a plurality of layers that are laminated by winding a metal plate-like member having a plurality of openings having protrusions formed on the periphery thereof, and the top plate and the top plate It is sandwiched in the axial direction by the bottom plate and fixed to the housing. Between the plurality of layers of the filter, a gap is formed by positioning the protrusion. At least one of the axial end of the filter on the top plate portion side and the axial end of the filter on the bottom plate portion side is fixed when the top plate portion and the bottom plate portion are fixed. A deformation region is provided that is deformed so as to reduce the outer dimension in the axial direction of the filter.

  In the gas generator according to the present invention, the deformation region is constituted by a bent portion formed by bending the axial end portion of the filter, or the axial end portion of the filter is formed. It is preferable that the curved portion is formed by bending.

  In the gas generator according to the present invention, the deformation region may be provided only in a part of the plurality of layers of the filter.

  In the gas generator according to the present invention, the protrusion formed on the innermost layer of the plurality of layers of the filter protrudes outward in the radial direction of the filter, and the plurality of the filter It is preferable that the protrusion formed on the outermost layer of the layers protrudes radially inward of the filter.

  The filter for gas generators based on this invention is a short hollow cylindrical laminated body which has several layers laminated | stacked by winding the metal plate-shaped member which has several opening part by which the projection part was formed in the periphery. And is sandwiched in the axial direction and fixed to the housing of the gas generator. A gap is formed between the plurality of layers by positioning the protrusion. At least one of the pair of axial end portions of the filter is provided with a deformation region that is deformed so as to reduce the outer dimension in the axial direction when fixed.

  In the gas generator filter according to the present invention, the deformation region is configured by a bent portion formed by bending an axial end portion, or formed by curving the axial end portion. It is preferable that it is comprised by the curved part.

  In the gas generator filter according to the present invention, the deformation region may be provided only in a part of the plurality of layers of the filter.

  In the gas generator filter according to the present invention, the protrusion formed on the innermost layer of the plurality of layers protrudes radially outward and is formed on the outermost layer of the plurality of layers. It is preferable that the above-mentioned protruding portion protrudes inward in the radial direction.

  According to the present invention, a gas generator that can be easily assembled and reduced in manufacturing cost even when a filter constituted by a laminate of hook metal is used, and a gas generator filter used therefor, can do.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment described below, the present invention is applied to a so-called disk-type gas generator incorporated in an airbag device mounted on a steering wheel or the like of an automobile.

(Embodiment 1)
FIG. 1 is a schematic cross-sectional view of a gas generator according to Embodiment 1 of the present invention. First, with reference to FIG. 1, the structure of the gas generator in this Embodiment is demonstrated.

  As shown in FIG. 1, the gas generator 1A according to the present embodiment has a short cylindrical housing closed at both ends in the axial direction, and various components are accommodated inside the housing. Yes. The short cylindrical housing is formed by combining an initiator shell 20 and a closure shell 30 each formed in a bottomed cylindrical shape. The initiator shell 20 has a bottom plate portion 21 and a peripheral wall portion 22, and the closure shell 30 has a top plate portion 31 and a peripheral wall portion 32.

  Each of the initiator shell 20 and the closure shell 30 is made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy. The initiator shell 20 and the closure shell 30 are each formed by forging, drawing, pressing, or a combination thereof using a die or the like from one plate-like or one-piece block-like metal member. For joining the initiator shell 20 and the closure shell 30, electron beam welding, laser welding, friction welding, or the like is preferably used.

  A holding portion 23 is formed at a substantially central portion of the bottom plate portion 21 of the initiator shell 20. This holding part 23 is a part for inserting and holding the igniter 12. Specifically, the igniter 12 is attached to the holding portion 23 from the inside of the initiator shell 20 so that the terminal pin 12b of the igniter 12 is inserted into the opening provided in the holding portion 23. In this state, The igniter 12 is caulked and fixed to the holding portion 23 of the initiator shell 20 by caulking the caulking portion 23 a provided at the tip toward the igniter 12 side. A harness connector (not shown) for connecting the igniter 12 and the control unit is connected to the terminal pin 12b disposed so as to be exposed to the outside of the housing.

  The igniter 12 is an ignition device for generating a flame, and includes an ignition part 12a and the terminal pin 12b described above. The ignition unit 12a has a squib cup made of metal or plastic, and includes an ignition agent that ignites during operation and a resistor (bridge wire) for burning the ignition agent. The terminal pin 12b is connected to a resistor for igniting the igniting agent. Nichrome wire or the like is generally used as the resistor, and ZPP (zirconium / potassium perchlorate), ZWPP (zirconium / tungsten / potassium perchlorate), lead tricinate, or the like is generally used as the igniting agent.

  A seal member 14 is interposed between the igniter 12 and the holding portion 23. The seal member 14 is for hermetically sealing a gap generated between the igniter 12 and the holding portion 23 to hermetically seal a transfer chamber 43 described later, and the igniter 12 is caulked to the holding portion 23. When it is fixed, it is inserted into the gap. The seal member 14 is preferably made of a material having sufficient heat resistance and durability. For example, an O-ring made of EPDM resin, which is a kind of ethylene propylene rubber, is preferably used.

  A bottomed cylindrical cup-shaped member 40 is fixed to the holding portion 23 of the initiator shell 20 so as to cover the igniter 12. The cup-shaped member 40 has a top wall portion 40a, a side wall portion 40b, and a flange portion 40c, and includes a fire transfer chamber 43 in which a charge transfer agent 44 is accommodated. The cup-shaped member 40 is fixed to the holding portion 23 so that the heat transfer chamber 43 provided therein faces the ignition portion 12a. More specifically, the cup-shaped member 40 is fixed to the holding portion 23 by caulking the flange portion 40 c of the cup-shaped member 40 by the caulking portion 24 provided in the holding portion 23.

  The cup-shaped member 40 has an opening 41 in the side wall 40b, and a seal member 42 is stuck on the outer peripheral surface of the side wall 40b so as to close the opening 41. As the sealing member 42, an aluminum foil or the like having an adhesive member applied on one side is used. This prevents the transfer charge 44 from moving to the combustion chamber 50 via the opening 41. In addition, the cup-shaped member 40 is comprised with metal members, such as stainless steel, steel, an aluminum alloy, a stainless alloy, for example.

The transfer charge 44 filled in the transfer chamber 43 is ignited by a flame generated by the operation of the igniter 12 and burns to generate hot particles. The charge transfer agent 44 must be capable of reliably starting the combustion of a gas generating agent 51, which will be described later, and is generally a metal powder / oxidant represented by B / KNO ₃ or the like. A composition or the like is used. As the charge transfer agent 44, a powdery one, a one molded into a predetermined shape by a binder, or the like is used. Examples of the shape of the transfer charge molded by the binder include various shapes such as a granular shape, a columnar shape, a sheet shape, a spherical shape, a single-hole cylindrical shape, a porous cylindrical shape, and a tablet shape.

  A combustion chamber 50 in which the gas generating agent 51 is accommodated is located in a space surrounding the portion where the cup-shaped member 40 is disposed in the space inside the housing formed of the initiator shell 20 and the closure shell 30. . More specifically, the cup-shaped member 40 described above is disposed so as to protrude into a combustion chamber 50 formed inside the housing, and a portion facing the outer surface of the side wall portion 40b of the cup-shaped member 40. The provided space is configured as a combustion chamber 50.

  Further, a filter 60 is disposed along the inner periphery of the housing in a space surrounding the combustion chamber 50 in which the gas generating agent 51 is accommodated. The filter 60 has a hollow cylindrical shape and is disposed coaxially with the housing. The filter 60 is made of a laminated body formed by winding a metal plate-like member having a plurality of openings 62, and has a cylindrical part 61 and a bent part 64 in the axial direction. The detailed structure of the filter 60 will be described later.

  The gas generating agent 51 is ignited by hot particles generated by burning the charge transfer agent 44 ignited by the igniter 12, and generates gas by burning. The gas generating agent 51 is generally formed as a molded body containing a fuel, an oxidant, and an additive. As the fuel, for example, a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, or a combination thereof is used. Specifically, for example, nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole and the like are preferably used. In addition, as the oxidizing agent, for example, nitrate containing a cation selected from alkali metals, alkaline earth metals, transition metals, and ammonia is used. As the nitrate, for example, sodium nitrate, potassium nitrate and the like are preferably used. In addition, examples of the additive include a binder, a slag forming agent, and a combustion adjusting agent. As the binder, for example, organic binders such as metal salts of carboxymethyl cellulose and stearates, and inorganic binders such as synthetic hydroxytalcite and acid clay can be suitably used. As the slag forming agent, silicon nitride, silica, acid clay, etc. can be suitably used. Moreover, as a combustion regulator, a metal oxide, ferrosilicon, activated carbon, graphite, etc. can be used suitably.

  The shape of the molded body of the gas generating agent 51 includes various shapes such as a granular shape, a pellet shape, a cylindrical shape, and a disk shape. In addition, a porous (for example, a single-hole cylindrical shape or a porous cylindrical shape) having a hole inside the molded body is also used. These shapes are preferably selected as appropriate according to the specifications of the airbag apparatus in which the gas generator 1A is incorporated. For example, the shape in which the gas generation rate changes with time during the combustion of the gas generating agent 51 is selected. It is preferable to select an optimal shape according to the specifications. In addition to the shape of the gas generating agent 51, it is preferable to appropriately select the size and filling amount of the molded body in consideration of the linear combustion rate of the gas generating agent 51, the pressure index, and the like.

  The outer peripheral surface of the filter 60 is located at a predetermined distance from the inner peripheral surface of the peripheral wall portion 22 of the initiator shell 20 and the inner peripheral surface of the peripheral wall portion 32 of the closure shell 30. A plurality of gas outlets 33 are provided in the peripheral wall portion 32 of the closure shell 30 that faces the filter 60. The gas outlet 33 is for leading the working gas that has passed through the filter 60 to the outside of the housing. A seal member 34 is affixed to a main surface located on the filter 60 side of the peripheral wall portion 32 of the closure shell 30 so as to close the gas outlet 33. As the sealing member 34, an aluminum foil or the like having an adhesive member applied on one side is used. Thereby, the airtightness of the combustion chamber 50 is ensured.

  An outflow prevention member 54 for preventing combustion gas from flowing out from the gap between the filter 60 and the closure shell 30 is disposed at the end of the combustion chamber 50 on the top plate portion 31 side of the closure shell 30. Yes. The outflow prevention member 54 is formed by pressing or the like a metal plate-like member such as stainless steel or steel, and a portion that contacts the inner peripheral surface of the upper end portion of the filter 60 and the closure shell 30. It consists of a cyclic | annular member which has a part contact | abutted to the top-plate part 31 of this. Here, the outflow prevention member 54 has appropriate elasticity, and is in appropriate pressure contact with each of the inner peripheral surface of the filter 60 and the top plate portion 31 of the closure shell 30.

  Inside the outflow prevention member 54, a cushion material 52 is arranged so as to contact the gas generating agent 51 accommodated in the combustion chamber 50. The cushion material 52 is provided for the purpose of preventing the gas generating agent 51 made of a molded body from being pulverized by vibration or the like, and a ceramic fiber molded body, foamed silicon, or the like is preferably used.

  An outflow prevention member 55 for preventing combustion gas from flowing out from the gap between the filter 60 and the initiator shell 20 is disposed at the end of the combustion chamber 50 on the side of the bottom plate portion 21 of the initiator shell 20. . The outflow prevention member 55 is formed by pressing a metal plate-like member such as stainless steel or steel, and is in contact with the inner peripheral surface of the lower end portion of the filter 60 and the initiator shell 20. It consists of a cyclic | annular member which has a site | part which contact | abuts the bottom-plate part 21 of this. Here, the outflow prevention member 55 has appropriate elasticity, and is in appropriate pressure contact with each of the inner peripheral surface of the filter 60 and the bottom plate portion 21 of the initiator shell 20.

  Next, operation | movement of 1 A of gas generators in this Embodiment is demonstrated with reference to the same figure. When a vehicle on which the gas generator 1A according to the present embodiment is mounted collides, the collision is detected by a collision detection unit provided separately in the vehicle, and the igniter 12 is activated based on this. The transfer charge 44 accommodated in the transfer chamber 43 is ignited and burned by the flame generated by the operation of the igniter 12, and generates a large amount of heat particles. When the pressure in the cup-shaped member 40 increases due to the combustion of the transfer powder 44, the sealing by the sealing member 42 that has closed the opening 41 is broken, and the above-described hot particles are transferred to the combustion chamber through the opening 41. Flow into 50.

  The gas generating agent 51 accommodated in the combustion chamber 50 is ignited and burned by the flowing heat particles, and a large amount of combustion gas is generated. The combustion gas generated in the combustion chamber 50 passes through the cylindrical portion 61 of the filter 60, and at that time, heat is taken away and cooled by the filter 60, and the slag contained in the combustion gas is the cylindrical shape of the filter 60. It is removed by the portion 61 and flows into the outer peripheral edge of the housing. As the internal pressure of the housing increases, the sealing by the sealing member 34 that has closed the gas outlet 33 of the closure shell 30 is broken, and combustion gas is jetted out of the housing through the gas outlet 33. The jetted gas is introduced into an airbag provided adjacent to the gas generator 1A, and the airbag is inflated and deployed.

  2 is a schematic perspective view of the filter shown in FIG. 1, and FIG. 3 is an enlarged perspective view of a surface portion of the filter shown in FIG. 4 is a schematic development view of the filter, and FIG. 5 is a schematic cross-sectional view of the filter along the line V-V shown in FIG. Next, a detailed structure of the gas generator filter in the present embodiment will be described with reference to FIGS.

  As shown in FIG. 2, the filter 60 has a cylindrical portion 61 formed in a cylindrical shape, and a bent portion 64 formed by bending the lower end of the cylindrical portion 61 outward. . The filter 60 is configured by a laminated body formed by winding a metal plate-like member having a plurality of openings 62 formed by pressing (burring), and the openings 62 are laminated. Are provided across all of the layers.

  More specifically, one end 60a in the longitudinal direction of a long metal plate-like member 60 'as shown in FIG. 4 is located on the inner side and the other end 60b is located on the outer side. The metal plate-like member 60 'is wound in a spiral shape, and each layer is welded or the like at the joining margin portion where the portion near the one end 60a and the portion near the other end 60b overlap each other, thereby A cylindrical filter 60 is formed. In the filter 60 according to the present embodiment, a metal plate-like member 60 ′ is wound around two rounds except for a portion to be joined.

  As shown in FIG. 3, a protrusion 63 is formed on the periphery of the opening 62 formed in the metal plate member 60 '. The protrusion 63 is formed at the time of pressing for forming the opening 62 in the metal plate-like member 60 ′ described above, and is used to form the protrusion 63 having a shape as shown in the drawing. For this, it is preferable to perform pressing using a pyramid or conical pin as the pressing die. In addition, it is preferable to adjust to a predetermined height by rolling with a roller after the pressing as shown in the drawing as needed, but use the one after the pressing as it is. Is also possible.

  As described above, the filter 60 is formed of a laminated body formed by winding a metal plate member 60 ′ having a plurality of openings 62 having protrusions 63 formed on the periphery. Therefore, due to the presence of the protrusions 63, gaps 66 as shown in FIGS. 2 and 5 are formed between the layers of the laminated metal plate members 60 ′. Due to the gap 66 and the opening 62, a maze-shaped flow path (see FIG. 5) that connects the space inside the filter 60 and the space outside the filter 60 is formed inside the filter 60. .

  As shown in FIGS. 4 and 5, the protrusion 63 a formed on the metal plate-like member 60 ′ constituting the innermost layer of the filter 60 after winding has a protruding direction on the outer peripheral side (that is, The filter 60 is configured to be outside the filter 60 in the radial direction after winding. On the other hand, the protrusion 63b formed on the metal plate-like member 60 ′ constituting the outermost layer of the filter 60 after winding has a protruding direction on the inner peripheral side (that is, after winding, the filter 60 radially outward). This is because a predetermined position in the longitudinal direction of the metal plate-like member 60 ′ during the above-described pressing (in this embodiment, a boundary portion between the innermost layer portion and the outermost layer portion, that is, FIG. 4 and FIG. This can be easily realized by reversing the pressing direction of the pressing die at the position A) shown in FIG. With this configuration, since the protrusion 63 is not located on either the inner peripheral surface or the outer peripheral surface of the filter 60, the gas generating agent 51 accommodated in the space inside the filter 60 is the protrusion 63. While being able to prevent crushing, the flow path formed in the gap 66 of the filter 60 can be made more complicated.

  Further, as shown in FIG. 4, the position of the opening 62a formed in the metal plate-like member 60 ′ constituting the innermost layer of the filter 60 after winding and the innermost position of the filter 60 after winding. The positions of the openings 62b formed in the metal plate-like member 60 'constituting the outer layer are shifted from each other so that the openings 62a and 62b do not face each other after winding. Yes. With this configuration, the flow path formed in the gap portion 66 of the filter 60 can be made more complicated. In addition, the opening part 62 is not formed in the bending part formation scheduled area | region 60c which will be located in the lower end part of the filter 60 after winding, Therefore, the projection part 63 is also not formed.

  FIG. 6 is an enlarged cross-sectional view showing a state before assembling to the housing near the bent portion provided in the filter in the present embodiment, and FIG. 7 is an enlarged cross-sectional view after assembling. 7 corresponds to an enlarged cross-sectional view in which the region VII shown in FIG. 1 is enlarged. Next, with reference to FIG. 6 and FIG. 7, the configuration near the bent portion of the filter before and after assembly will be described.

  As shown in FIG. 6, a bent portion 64 a formed by bending the tubular portion 61 a is located at the lower end of the tubular portion 61 a corresponding to the innermost layer of the filter 60, and the outermost layer of the filter 60. A bent portion 64b formed by bending the cylindrical portion 61b is located at the lower end of the cylindrical portion 61b corresponding to the above. These bent portions 64a and 64b correspond to deformation regions that reduce the axial outer dimensions of the filter 60 when the filter 60 is fixed to the housing.

  In the filter 60 in the present embodiment, prior to winding the metal plate-like member 60 ′, the bent portion formation scheduled region 60 c (see FIG. 4) is bent in advance at a predetermined angle θ 1, and then the metal It is formed by winding a plate-like member 60 'made of steel. Accordingly, the two bent portions 64a and 64b are both inclined at a predetermined angle θ1 with respect to the cylindrical portions 61a and 61b.

  As shown in FIG. 7, when the filter 60 is sandwiched and fixed from the bottom plate portion 21 of the initiator shell 20 and the top plate portion 31 of the closure shell 30 from the axial direction, the bent portions 64a and 64b are formed into the cylindrical portions 61a, 61b is elastically deformed at each boundary with 61b, and the axial ends of the filter 60 are in pressure contact with the bottom plate 21 of the initiator shell 20 and the top plate 31 of the closure shell 30 with appropriate pressure. Become. Here, in the gas generator 1A in the present embodiment, since the bottom plate portion 21 of the initiator shell 20 is configured to be inclined with respect to the axis of the filter 60, the two bent portions 64a and 64b are Also, the cylindrical portions 61a and 61b are brought into pressure contact with inclinations at angles θ2 and θ3 larger than the above θ1.

  By using the filter 60 and the gas generator 1A including the filter 60 as described above, the filter 60 is moved from the axial direction of the initiator shell 20 by the action of the bent portions 64a and 64b as deformation regions provided in the filter 60. When sandwiched and fixed between the bottom plate portion 21 and the top plate portion 31 of the closure shell 30, the axial length of the filter 60 is slightly reduced, and the axial end portion of the filter 60 is the bottom plate portion 21 and the closure of the initiator shell 20. The top plate portion 31 of the shell 30 is brought into pressure contact with an appropriate pressure. Therefore, the filter 60 can be stably assembled to the housing with a high yield without increasing the control of the dimensional accuracy of the filter 60, the housing, and the like, and the manufacturing cost can be suppressed. Therefore, even when a filter composed of a hook metal laminate is used, it is possible to provide a gas generator that can be easily assembled and reduced in manufacturing cost, and a gas generator filter used therefor. .

  The thickness of the metal plate-like member 60 ′ constituting the filter 60 is preferably 0.15 mm or more and 0.3 mm or less, and more preferably 0.2 mm or more and 0.25 mm or less. As shown in FIG. 1, when the axial lengths of the bent portions 64a and 64b are d, d is 0.3 mm or more and 3 mm or less as the size of the bent portions 64a and 64b in the axial direction. Preferably, it is 0.5 mm or more and 2 mm or less. Further, as shown in FIG. 6, when the length in the radial direction of the bent portions 64a and 64b is L, L is 0.3 mm or more and 2.5 mm or less. More preferably, it is 0.5 mm or more and 1.5 mm or less. In addition, the angle θ1 described above is preferably approximately 15 ° to 75 °, and more preferably 30 ° to 60 °.

  8 and 9 are enlarged cross-sectional views showing the shapes of the filters according to the first and second modifications of the present embodiment. Next, the shape of the filter according to the first and second modifications will be described with reference to FIGS. 8 and 9.

  As shown in FIG. 8, in the filter 60A according to the first modified example, bent portions 64a and 64b are formed at the lower ends of the filter 60A as in the above-described embodiment. Here, in the filter 60A according to the present modification, the lower end of the filter 60A is inserted by inserting a mold having a predetermined shape from the opening on the lower end side of the filter 60A after winding the metal plate-like member 60 '. Folded portions 64a and 64b are formed on the surface. In this case, the bent portion 64a formed at the lower end of the cylindrical portion 61a corresponding to the innermost layer has an inner peripheral surface of the bent portion 64b whose outer peripheral surface is formed at the lower end of the cylindrical portion 61b corresponding to the outermost layer. It will abut. Even in such a configuration, the same effect as that obtained when the filter 60 in the present embodiment is used can be obtained. In addition, it is preferable to make the dimension of the bending part 64b at the time of the said structure the same as that in the above-mentioned this Embodiment.

  As shown in FIG. 9, in the filter 60B according to the second modification, unlike the filter 60 in the present embodiment described above, the bent portion 65a formed by curving the lower ends of the cylindrical portions 61a and 61b. , 65b constitute a deformation region. Prior to winding the metal plate member 60 ', the bent portions 65a and 65b are curved in advance at the lower end of the metal plate member 60', and then the metal plate member 60 '. It can be formed by winding '. Even in such a configuration, the same effect as that obtained when the filter 60 in the present embodiment is used can be obtained. Note that the dimensions and the like of the bent portions 65a and 65b in the case of the above configuration are preferably the same as those in the present embodiment described above.

(Embodiment 2)
FIG. 10 is a schematic cross-sectional view of a gas generator according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected in the figure about the part similar to 1 A of gas generators in above-mentioned Embodiment 1, and the description is not repeated here.

  As shown in FIG. 10, in the gas generator 1 </ b> B according to the present embodiment, the bent portions 64 a and 64 b as the deformation regions are not formed at the lower end of the filter 60, and the bends as the deformation regions are formed at the upper end of the filter 60. Portions 64a and 64b are formed. In this case, when the filter 60 is sandwiched and fixed from the bottom plate portion 21 of the initiator shell 20 and the top plate portion 31 of the closure shell 30 from the axial direction, the bent portions 64a and 64b respectively connect the boundary portions with the cylindrical portions 61a and 61b. The elastic deformation occurs at the boundary, and the axial end portions of the filter 60 are brought into pressure contact with the bottom plate portion 21 of the initiator shell 20 and the top plate portion 31 of the closure shell 30 with an appropriate pressure. Even in such a configuration, the same effect as that obtained when the filter 60 in the first embodiment described above is used can be obtained. Note that the dimensions and the like of the bent portions 64a and 64b in the case of the above configuration are preferably the same as those in the present embodiment described above.

(Embodiment 3)
FIG. 11 is a schematic cross-sectional view of a gas generator according to Embodiment 3 of the present invention. In addition, the same code | symbol is attached | subjected in the figure about the part similar to 1 A of gas generators in above-mentioned Embodiment 1, and the description is not repeated here.

  In the gas generator 1A according to Embodiment 1 of the present invention described above, the bent portions 64a and 64b are formed as deformation regions at the lower ends of all the layers of the filter 60. However, as shown in FIG. 11, in the gas generator 1 </ b> C in the present embodiment, bent portions 64 a and 64 b as deformation regions are formed only at the lower ends of some of the plurality of layers of the filter 60. ing. Specifically, the filter 60 of the gas generator 1C in the present embodiment is formed by winding a metal plate-like member over four layers, and two outer layers including the outermost layer among them. Folded portions 64a and 64b are formed at the lower end of the inner layer, and no bent portion is provided at the lower ends of the two inner layers including the innermost layer. Even in such a configuration, the same effect as that obtained when the filter 60 in the first embodiment described above is used can be obtained.

  That is, a deformation region is formed in at least one of the plurality of layers of the filter, and the deformation region is in pressure contact with the housing so as to reduce the outer dimension in the axial direction of the filter when the filter is fixed by the housing. As long as it is configured to be deformed and fixed, the above-described effects can be obtained. In the case where a deformation region is provided only in a part of the plurality of layers of the filter, the number, position, etc. of the layers in which the deformation region is formed are appropriately changed according to the specifications of the gas generator. Is possible.

  In the above-described embodiment of the present invention and its modifications, the case where the number of filter layers formed by winding and laminating metal plate-like members is two or four is used. Although the description has been given by way of example, the number of the layers is not limited to two or four layers, and any number of layers may be stacked as long as they are plural. Further, in the above-described embodiment of the present invention and the modification thereof, the case where the deformation region is provided on one of the axial end portions of the filter has been described as an example. It is good also as providing a deformation | transformation area | region in both.

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

It is a schematic cross section of the gas generator in Embodiment 1 of the present invention. It is a schematic perspective view of the filter shown in FIG. It is an expansion perspective view of the surface part of the filter shown in FIG. It is a model expanded view of the filter shown in FIG. It is typical sectional drawing along the VV line shown in FIG. It is an expanded sectional view which shows the state before the assembly | attachment to the housing of the bending part vicinity provided in the filter shown in FIG. It is an expanded sectional view which shows the state after the assembly | attachment to the housing of the vicinity of the bending part provided in the filter shown in FIG. It is an expanded sectional view which shows the shape of the filter which concerns on the 1st modification of Embodiment 1 of this invention. It is an expanded sectional view which shows the shape of the filter which concerns on the 2nd modification of Embodiment 1 of this invention. It is a schematic cross section of the gas generator in Embodiment 2 of the present invention. It is a schematic cross section of the gas generator in Embodiment 3 of the present invention.

Explanation of symbols

  1A, 1B Gas generator, 12 igniter, 12a ignition part, 12b terminal pin, 14 sealing member, 20 initiator shell, 21 bottom plate part, 22 peripheral wall part, 23 holding part, 23a, 24 caulking part, 30 closure shell, 31 Top plate part, 32 peripheral wall part, 33 gas outlet, 34 seal member, 40 cup-shaped member, 40a top wall part, 40b side wall part, 40c flange part, 41 opening part, 42 seal member, 43 fire transfer chamber, 44 transmission Gunpowder, 50 Combustion chamber, 51 Gas generating agent, 52 Cushion material, 54, 55 Outflow prevention member, 60, 60A, 60B Filter, 60 'Plate member, 60a One end, 60b The other end, 60c Bending portion formation planned area, 61, 61a, 62b cylindrical portion, 62, 62a, 62b opening, 63, 63a, 63b protrusion, 64, 64a, 64b bent part, 65a, 65b bent part, 66 gap part.

Claims (8)

A short cylindrical housing that includes a combustion chamber in which a gas generating agent is housed, and is constituted by a top plate portion and a bottom plate portion that close both ends in the axial direction, and a peripheral wall portion provided with a gas ejection port;
Ignition means attached to the bottom plate so as to face the combustion chamber;
A hollow cylindrical filter disposed inside the housing and surrounding the combustion chamber in a radial direction of the housing;
The filter is composed of a laminate having a plurality of layers laminated by winding a metal plate-like member having a plurality of openings having protrusions formed on the periphery, and the top plate and the top plate Sandwiched in the axial direction by the bottom plate and fixed to the housing,
Between the plurality of layers of the filter, a gap is formed by positioning the protrusion,
At least one of an axial end on the top plate side of the filter and an axial end on the bottom plate side of the filter, the shaft of the filter is fixed by the top plate and the bottom plate. A gas generator provided with a deformation region that deforms so as to reduce an outer dimension in a direction.   The deformation region is configured by a bent portion formed by bending an axial end portion of the filter or a bent portion formed by curving the axial end portion of the filter. The gas generator according to claim 1.   The gas generator according to claim 1 or 2, wherein the deformation region is provided only in a part of the plurality of layers of the filter. The protrusion formed on the innermost layer of the plurality of layers of the filter protrudes radially outward of the filter;
The gas generator according to any one of claims 1 to 3, wherein the protrusion formed on the outermost layer of the plurality of layers of the filter protrudes toward a radially inner side of the filter. Consists of a short hollow cylindrical laminate having a plurality of layers laminated by winding a metal plate-like member having a plurality of openings with protrusions formed on the periphery, and sandwiched in the axial direction A gas generator filter fixed to the housing of the gas generator,
Between the plurality of layers, a gap is formed by positioning the protrusion,
A filter for a gas generator, wherein at least one of a pair of axial end portions of the filter is provided with a deformation region that is deformed so as to reduce an outer dimension in an axial direction when fixed.   6. The deformation region is configured by a bent portion formed by bending an axial end portion or a bent portion formed by bending an axial end portion. The filter for gas generators as described in 2.   The gas generator filter according to claim 5 or 6, wherein the deformation region is provided only in a part of the plurality of layers of the filter. The protrusion formed on the innermost layer of the plurality of layers protrudes radially outward,
The filter for gas generators in any one of Claim 5 to 7 with which the said protrusion part formed in the outermost layer of these layers protrudes toward radial inside.

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