JP2008296763A - Gas generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas generator capable of attaining a sufficient air-tight property between a combustion chamber and a filter chamber by a simple constitution and facilitating assembling work. <P>SOLUTION: The gas generator is provided with a lengthy cylindrical member 10 made of metal; and a partition member 12A for dividing a space at the inside of the cylindrical member 10 to the combustion chamber 17 and the filter chamber 18 in an axial direction. The partition member 12A includes a base part 13 made of metal provided with a communication hole 13a for communicating the combustion chamber 17 with the filter chamber 18; and a covering part 14 provided so as to cover a surface of the base part 13. The partition member 12A is fixed to the cylindrical member 10 by clamping its peripheral edge by a pair of calking parts 10B provided by diameter-contracting the peripheral wall of the cylindrical member 10. The covering part 14 has a first seal part 14a interposed between a peripheral edge of the base part 13 and the calking part 10B; and a second seal part 14b continuously extending from the first seal part 14a and closing an opening surface of the communication hole 13a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas generator incorporated in an airbag device as an occupant protection device mounted on an automobile or the like.

  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 installed in a vehicle or the like for the purpose of protecting an occupant from an impact caused by the collision of the vehicle or the like, and the airbag is deployed by instantly inflating and deploying the airbag at the time of the vehicle or the like collision. It is a safety device that catches the occupant's body. The gas generator is a device that is incorporated in the airbag device and inflates and deploys the airbag by instantaneously generating gas when a vehicle or the like collides.

  There are various types of gas generators based on specifications such as installation position and output with respect to a vehicle or the like. One of them is a gas generator having a structure called “cylinder type”. The cylinder type gas generator has a long cylindrical shape, and is suitably incorporated in a side airbag device or the like. In a cylinder type gas generator, an igniter and a transfer charge are disposed at one end in the axial direction, a gas generating agent is disposed at a substantially central portion in the axial direction, and a filter and a gas outlet are disposed at the other end in the axial direction. Be placed.

  In this cylinder type gas generator, the flame generated by the operation of the igniter is transmitted to the gas generating agent through the combustion of the explosive charge, whereby the gas generating agent burns to generate high-temperature and high-pressure gas. . The generated high-temperature and high-pressure gas is ejected from the gas ejection port to the outside of the housing via the filter, and is used for inflation and deployment of the airbag.

  Further, a gas generator having a structure called “T-shaped” is known as a configuration similar to a cylinder type gas generator. The outer shape of the T-shaped gas generator is a long cylindrical shape like the above-described cylinder-type gas generator, and is suitably incorporated in a side airbag device or the like. In the T-shaped gas generator, a single igniter and a charge transfer agent are disposed at a substantially central portion in the axial direction, a gas generating agent is disposed on both sides in the axial direction, and a pair of outer sides in the axial direction is provided. A filter and a gas outlet are arranged.

  Also in this T-shaped gas generator, the flame generated by the operation of the igniter is transmitted to the gas generating agent located on both sides of the charge transfer agent through the combustion of the transfer charge, whereby the gas generating agent burns. High temperature and high pressure gas is generated. The generated high-temperature and high-pressure gas is ejected from the gas ejection port to the outside of the housing through filters located at both ends in the axial direction of the housing, and is used for inflation and deployment of the airbag, respectively. This T-shaped gas generator is distinguished from the above-described cylinder type gas generator in that a different gas output can be obtained from both ends in the axial direction of the housing by using a single igniter. It is.

  In these cylinder type gas generator and T-shaped gas generator, it is necessary to partition the space inside the housing into a combustion chamber in which a gas generating agent is accommodated and a filter chamber in which a filter is accommodated. Usually, a partition member provided with a communication hole is used for the partition between the combustion chamber and the filter chamber. The partition member is inserted into and fixed to the cylindrical member, whereby the space inside the housing is partitioned into the combustion chamber and the filter chamber. In addition, the communication hole provided in the partition member is a hole for communicating the combustion chamber and the filter chamber when the gas generator is operated, and guiding the gas generated in the combustion chamber to the filter chamber.

  As the gas generator adopting the above-described configuration, for example, one disclosed in Japanese Patent Laid-Open No. 11-78766 (Patent Document 1) or one disclosed in Japanese Patent Laid-Open No. 2002-362299 (Patent Document 2). Japanese Patent Laid-Open No. 2005-313812 (Patent Document 3) and the like are known.

  By the way, in the gas generator in which the space inside the housing is axially divided into the combustion chamber and the filter chamber by inserting and fixing the partition member inside the cylindrical member, the combustion chamber and the filter chamber are separated from each other. It is important to ensure airtightness. This is to prevent the outside air containing moisture from entering the combustion chamber containing the gas generating agent from the filter chamber communicating with the external space via the gas jetting port, and ensure the airtightness. Thus, it is possible to prevent the gas generating agent from absorbing moisture. Therefore, in the gas generator adopting the above configuration, the sealing process is performed between the periphery of the partition member and the cylindrical member, and the sealing process is performed so as to close the communication hole provided in the partition member. Will be subjected to another sealing process.

  Specifically, as a sealing process performed between the peripheral edge of the partition member and the cylindrical member, a resin seal member is generally interposed between these members. For example, in the gas generator disclosed in Patent Document 1, an O-ring as a resin sealing member is attached to the periphery of the partition member, and the O-ring is sandwiched between the partition member and the cylindrical member and compressed. Thereby, it is comprised so that the sealing performance in the said part may be ensured. Further, in the gas generator disclosed in Patent Document 2, a resin seal member is attached to the periphery of the partition member by a welding process, and the resin seal member is pressed against the cylindrical member, whereby the portion The sealing performance is ensured.

  In addition, as a sealing process different from the sealing process using these resin members, the partition member and the cylindrical member are brought into close contact with each other by performing a caulking process called eight-side caulking, and a sealing property between these members by so-called metal touch. (See Japanese Patent Application Laid-Open No. 2005-186074 (Patent Document 4) for details of the sealing process by caulking). In the gas generator disclosed in the above-mentioned Patent Document 3, this metal touch sealing process is employed.

On the other hand, as a sealing process applied to the communication hole provided in the partition member, a metal seal member is generally attached so as to cover the communication hole. For example, in the gas generators disclosed in Patent Documents 1 and 3, by sealing an aluminum tape so as to cover the opening surface of the communication hole on one surface of the partition member, the sealing performance at the portion is ensured. It is configured to be. Further, in the gas generator disclosed in Patent Document 2, a thin plate called a burst plate is attached to one side of the partition member so as to close the opening surface of the communication hole, thereby ensuring the sealing performance at the part. It is comprised so that.
Japanese Patent Laid-Open No. 11-78766 JP 2002-362299 A JP 2005-313812 A JP 2005-186074 A

  As described above, in the conventional cylinder type gas generator and the T-shaped gas generator, the sealing process is performed between the peripheral edge of the partition member and the cylindrical member, and the communication hole provided in the partition member A sealing process different from the above-described sealing process was performed so as to close the nozzle. As a result, the number of parts increases and the assembling work becomes complicated, resulting in an increase in manufacturing cost. In particular, the operation of attaching an aluminum tape to the partition member is very complicated, which has been a factor in increasing the manufacturing cost.

  In addition, as described above, when the sealing process performed between the peripheral edge of the partition member and the cylindrical member is performed by the metal touch sealing process as disclosed in Patent Document 4, the component Although the effect that the score can be reduced is obtained, another problem arises. In other words, in order to ensure the required sealing performance by the metal touch sealing process, it is necessary to clean the member sufficiently before caulking, and the above-mentioned eight-side caulking. This causes a problem in terms of manufacturing cost such that a special processing apparatus is required.

  Therefore, the present invention has been made to solve the above-described problems, and can achieve airtightness between the combustion chamber and the filter chamber with a simple configuration and can be easily assembled. An object of the present invention is to provide a gas generator.

  A gas generator according to the present invention is a long metal cylindrical member including therein a combustion chamber containing a gas generating agent and a filter chamber containing a filter, and is located inside the cylindrical member. A partition member that divides the space inside the cylindrical member in the axial direction into the combustion chamber and the filter chamber, and an igniter positioned on the combustion chamber side when viewed from the partition member. The partition member includes a metal base portion provided with a communication hole that communicates the combustion chamber and the filter chamber, and a covering portion provided to cover at least a part of the surface of the base portion. Contains. The partition member has a peripheral edge in the axial direction of the cylindrical member by a pair of caulking portions provided at positions sandwiching the partition member by reducing the diameter of the peripheral wall of the cylindrical member toward the inside in the radial direction. It is fixed to the cylindrical member by being sandwiched. The covering portion extends continuously from the first seal portion interposed between the periphery of the base portion and the caulking portion, and the opening surface of the communication hole on the combustion chamber side or the filter. A second seal portion that closes at least one of the chamber-side opening surfaces.

  By comprising in this way, when the 1st seal part of a coating | coated part is pinched | interposed by the periphery of the base part of a partition member, and a cylindrical member, the sealing process which should be performed between these members is the said 1st seal | sticker part of a coating | coated part. In addition, the communication hole provided in the partition member is closed by the second seal portion of the covering portion, whereby the sealing process to be performed on the communication hole is realized by the second seal portion of the covering portion. It becomes like this. That is, the sealing process at the periphery of the partition member and the communication hole is realized by a part of the covering portion. Therefore, it is possible to secure the airtightness between the combustion chamber and the filter chamber with a simple configuration in which the covering portion is provided on the partition member, and it is possible to reduce the number of parts and to perform the assembling work very much. The gas generator can be easily performed. As a result, a highly reliable gas generator can be manufactured at low cost.

  In the gas generator according to the present invention, it is preferable that the covering portion is constituted by a member made of a polymer material.

  By comprising in this way, the 1st seal part of the coating | coated part made from a polymeric material is inserted | pinched by the peripheral edge of the base part of a partition member, and a cylindrical member, and is compressed, and should be performed between these members Is reliably realized by the first seal portion of the covering portion made of the polymer material.

  In the gas generator according to the present invention, when the covering portion is formed of a member made of a polymer material, the covering portion is fixed to the surface of the base portion with respect to the base portion. It is preferably formed by integral molding.

  By configuring in this way, it becomes possible to previously provide a covering portion made of a polymer material on the partition member, so that the assembling work is greatly improved.

  In the gas generator according to the present invention, it is preferable that the covering portion is made of a metal member.

  By comprising in this way, the 1st seal part of a metal coating | coated part is pinched | interposed by the peripheral edge of the base part of a partition member, and a cylindrical member, and is distorted, The sealing process which should be performed between these members is metal. The first seal portion of the covering portion is surely realized.

  In the gas generator according to the present invention, when the covering portion is made of a metal member, the covering portion is attached to the base portion so as to cover the surface of the base portion. Preferably it is.

  By comprising in this way, a metal coating | coated part can be previously attached to a partition member, Therefore Assembling work comes to improve dramatically.

  In the gas generator according to the present invention, the base is preferably configured in a tapered shape so that the thickness in the axial direction decreases as the peripheral edge of the base portion goes radially outward. It is preferable that the first seal portion covers the tapered portion of the base portion.

  By configuring in this way, it is possible to ensure a larger size of the first seal portion at the portion sandwiched between the peripheral edge of the base portion of the partition member and the cylindrical member, thereby realizing a more reliable sealing process. It becomes possible.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the gas generator which can implement | achieve airtightness between a combustion chamber and a filter chamber with a simple structure, and can perform an assembly | attachment operation | work very easily. Therefore, a highly reliable gas generator can be manufactured at low cost.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment described below, a so-called cylinder type gas generator and a T-shaped gas generator incorporated in a side airbag device or the like will be described by specifically illustrating them.

(Embodiment 1)
1A and 1B are diagrams showing an external structure of a cylinder type gas generator according to Embodiment 1 of the present invention. FIG. 1A is a front view and FIG. 1B is a right side view. Moreover, FIG. 2 is a figure which shows the internal structure of the cylinder type gas generator in this Embodiment, and is sectional drawing along the II-II line shown to FIG. 1 (A) and FIG. 1 (B). First, with reference to these FIG. 1 (A), FIG. 1 (B), and FIG. 2, the external appearance structure and internal structure of the cylinder type gas generator in this Embodiment are demonstrated.

  As shown in FIG. 1A, FIG. 1B, and FIG. 2, the cylinder type gas generator 1A in the present embodiment has a long and substantially cylindrical outer shape, The closing member 20 and the base member 30 are included. The cylindrical member 10 is composed of a long member having openings at both ends in the axial direction. The closing member 20 is made of a disk-shaped member having a predetermined thickness, and has a groove 21 for caulking and fixing described later on the peripheral surface thereof. The caulking and fixing groove 21 is formed on the peripheral surface of the closing member 20 so as to extend in the circumferential direction. The base member 30 is formed of a cylindrical member having a hollow portion 32 extending in the same direction as the axial direction of the cylindrical member 10, and has a groove 31 for caulking and fixing described later at a predetermined position on the outer peripheral surface thereof. . The caulking fixing groove 31 is formed on the outer peripheral surface of the base member 30 so as to extend in the circumferential direction.

  The closing member 20 is attached to the cylindrical member 10 so as to close one open end of the cylindrical member 10. On the other hand, the base member 30 is attached to the other open end of the cylindrical member 10. Further, a partition member 12A made of a disk-shaped plate material is disposed at a predetermined position in the axial direction of the cylindrical member 10. The partition member 12 </ b> A partitions the space inside the cylindrical member 10 in the axial direction, and has a base portion 13 and a covering portion 14.

  The cylindrical member 10, the base portion 13 of the partition member 12A, the closing member 20, and the base member 30 are all made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy. The cylindrical member 10, the partition member 12A, the closing member 20 and the base member 30 are connected and fixed by caulking. Specifically, a part of the cylindrical member 10 corresponding to the groove 21 provided on the peripheral surface of the closing member 20 in a state where a part of the closing member 20 is inserted into one opening end of the cylindrical member 10. The closure member 20 is caulked and fixed to the cylindrical member 10 by reducing the diameter of the peripheral wall thereof radially inward and engaging with the groove 21, and the base member is fixed to the other opening end of the cylindrical member 10. In a state in which a part of 30 is inserted, the peripheral wall of the cylindrical member 10 corresponding to the groove 31 provided on the outer peripheral surface of the base member 30 is reduced in diameter radially inwardly and engaged with the groove 31. By doing so, the base member 30 is caulked and fixed to the cylindrical member 10. Further, the partition member 12A inserted in a predetermined position of the cylindrical member 10 is reduced in diameter with the peripheral walls of both side portions of the cylindrical member 10 corresponding to the portion where the partition member 12A is located facing radially inward. The peripheral edge is sandwiched in the axial direction of the cylindrical member 10 by a pair of caulking portions formed by the fixing, so that the caulking is fixed to the cylindrical member 10.

  These caulking fixings are caulking fixings called eight-side caulking that uniformly reduce the diameter of the peripheral wall of the cylindrical member 10 inward in the radial direction. By performing this caulking, the first to third caulking portions 10 </ b> A to 10 </ b> C are provided on the peripheral wall of the cylindrical member 10. Among these caulking portions, the first caulking portion 10 </ b> A is a caulking portion for fixing the closing member 20 to the cylindrical member 10, and the second caulking portion 10 </ b> B is for fixing the partition member 12 </ b> A to the cylindrical member 10. The third caulking portion 10 </ b> C is a caulking portion for fixing the base member 30 to the cylindrical member 10.

  As shown in FIGS. 1A and 2, a gas outlet 11 is provided on the peripheral wall near the end of the cylindrical member 10 on the side where the closing member 20 is attached. The gas ejection ports 11 are holes for ejecting the gas generated inside the cylinder type gas generator 1 </ b> A to the outside, and a plurality of gas ejection ports 11 are provided along the circumferential direction and the axial direction of the cylindrical member 10.

  As shown in FIG. 2, an ignition chamber 16, a combustion chamber 17, and a filter chamber 18 are provided in a space inside the cylinder type gas generator 1 </ b> A defined by the cylindrical member 10, the closing member 20 and the base member 30. ing. The partition member 12A described above partitions the combustion chamber 17 and the filter chamber 18 among them. On the other hand, the ignition chamber 16 and the combustion chamber 17 are partitioned by a cushion material 51 described later.

  The ignition chamber 16 is mainly defined by the cylindrical member 10, the base member 30, and the cushion material 51, and is provided in a portion near the other end of the cylindrical member 10 (right side portion in the drawing). An igniter (squib) 40 is disposed in the hollow portion 32 of the base member 30, and the resin molding portion 34 is located between the base member 30 and the igniter 40. A bottomed cylindrical cup-shaped member 35 is attached to the end of the base member 30 on the combustion chamber 17 side, and a heat transfer chamber 36 that is a space inside the bottomed cylindrical cup-shaped member 35 is provided. Contains an explosive charge (enhancer) 37.

  A concave portion 33 is provided on the outer peripheral surface of the base member 30 (that is, the surface facing the inner peripheral surface of the cylindrical member 10) so as to extend in the circumferential direction, and a seal member 38 is accommodated in the concave portion 33. ing. The seal member 38 is for hermetically sealing a gap generated between the cylindrical member 10 and the base member 30, and thereby the airtightness between the outside of the cylinder type gas generator 1 </ b> A and the ignition chamber 16. Will be secured. Further, the space between the inner peripheral surface of the base member 30 and the igniter 40 is sealed by the resin molding portion 34 as described above, whereby the space between the outside of the cylinder type gas generator 1A and the ignition chamber 16 is sealed. Airtightness is ensured.

  Note that a member having sufficient heat resistance and durability is preferably used as the sealing member 38 described above. For example, an EPDM O-ring which is a kind of ethylene propylene rubber can be suitably used. The seal member 38 is inserted and attached between these members when the cylindrical member 10 and the base member 30 are fixed by caulking. If a liquid sealant is separately applied to the portion where the seal member 38 is interposed and cured, higher airtightness can be obtained.

  The above-mentioned resin molding portion 34 is formed by, for example, insert molding, and the raw material thereof is a thermosetting resin typified by an epoxy resin or the like, polybutylene terephthalate resin, polyethylene terephthalate resin, polyamide resin (for example, nylon 6). And thermoplastic resins represented by polypropylene sulfide resin, polypropylene oxide resin, and the like.

  The igniter 40 is an ignition device for generating a flame, and includes an ignition unit 41 and a terminal pin 42. The ignition unit 41 includes an igniting agent that ignites during operation and a resistor for burning the igniting agent. The terminal pin 42 is connected to the ignition unit 41 in order to ignite the igniting agent. More specifically, the igniter 40 includes a base frame through which the pair of terminal pins 42 are inserted and held, and a squib cup attached to the base frame, and the terminal pins 42 inserted into the squib cup. A resistor (bridge wire) is attached so as to connect the tips of 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. 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. The squib cup is generally made of metal or plastic.

  When a collision is detected, a predetermined amount of current flows through the resistor via the terminal pin 42. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and the ignition 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 40 is activated is 2 milliseconds or less when a nichrome wire is used as the resistor.

The explosive charge 37 is ignited by a flame generated by the operation of the igniter 40 and burns to generate hot particles. It is necessary for the charge transfer agent 37 to be able to reliably start the gas generating agent 52 described later. Generally, from the metal powder / oxidant represented by B / KNO ₃ or the like. The composition etc. which become are used. As the explosive charge 37, 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.

  The combustion chamber 17 is defined by the cylindrical member 10, the partition member 12 </ b> A, and the cushion material 51, and is provided at a substantially central portion of the cylindrical member 10. A gas generating agent 52 is mainly accommodated in the combustion chamber 17.

  The gas generating agent 52 is ignited by the heat particles generated by burning the charge transfer agent 37 ignited by the igniter 40, and generates gas by burning. The gas generating agent 52 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, an organic binder such as a metal salt of carboxymethyl cellulose or a stearate, or an inorganic binder such as synthetic hydroxytalcite or acidic clay can be suitably used. As the slag forming agent, silicon nitride, silica, acid clay, etc. can be suitably used. Moreover, as a combustion regulator, a metal oxide, ferrosilicon, activated carbon, graphite, etc. can be used suitably.

  The shape of the molded body of the gas generating agent 52 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 appropriately selected according to the specifications of the airbag apparatus in which the cylinder type gas generator 1A is incorporated. For example, the shape in which the gas generation rate changes with time when the gas generating agent 52 is burned. It is preferable to select an optimal shape according to the specification, such as selecting. In addition to the shape of the gas generating agent 52, it is preferable to appropriately select the size and filling amount of the molded body in consideration of the linear combustion rate, the pressure index, etc. of the gas generating agent 52.

  The cushion material 51 that partitions the ignition chamber 16 and the combustion chamber 17 is disposed so as to contact the gas generating agent 52 accommodated in the combustion chamber 17. The cushion material 51 is provided for the purpose of preventing the gas generating agent 52 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. The cushion material 51 is opened or divided by burning of the transfer charge 37 during the operation of the cylinder type gas generator 1A, and may be burned out in some cases.

  As described above, the partition member 12 </ b> A that partitions the combustion chamber 17 and the filter chamber 18 includes the base portion 13 and the covering portion 14. A communication hole 13 a that communicates the combustion chamber 17 and the filter chamber 18 during operation is provided at the center of the base portion 13. On the main surface located on the combustion chamber 17 side of the base portion 13, the above-described covering portion 14 is located so as to close the opening surface on the combustion chamber 17 side of the communication hole 13a. The structure of the partition member 12A and the structure in the vicinity thereof will be described later.

  A perforated plate 19 provided with a plurality of communication holes 19a is disposed at the end of the combustion chamber 17 located on the partition member 12A side. The porous plate 19 rectifies the flow of gas released from the combustion chamber 17 during operation, and prevents the gas generating agent 52 accommodated in the combustion chamber 17 from moving to the filter chamber 18 in an unburned state. Is for. Therefore, all the communication holes 19a provided in the porous plate 19 are formed smaller than the outer shape of the gas generating agent 52, and are formed smaller than the communication holes 13a provided in the partition member 12A.

  The filter chamber 18 is defined by the cylindrical member 10, the closing member 20, and the partition member 12 </ b> A, and is provided in a portion near the one end of the cylindrical member 10 (the left portion in the drawing). A filter 53 is accommodated in the filter chamber 18. The filter chamber 18 communicates with the outside through the gas outlet 11 provided on the peripheral wall of the cylindrical member 10 described above.

  The filter 53 is made of a cylindrical member having a hollow opening 53 a extending in the same direction as the axial direction of the cylindrical member 10. By using the filter 53 made of a cylindrical member in this way, the flow resistance of the working gas flowing through the filter chamber 18 during operation can be kept low, and an efficient gas flow can be realized. As the filter 53, for example, a wire made of a metal such as stainless steel or steel, a wire wound around a net, or a material compressed 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. When the gas generated in the combustion chamber 17 passes through the filter 53, the filter 53 functions as a cooling unit that cools the gas by taking away the high-temperature heat of the gas, and a residue contained in the gas. It also functions as a removing means for removing (slag) and the like.

  A female connector (not shown) is attached to the end of the cylinder type gas generator 1A where the base member 30 is disposed. This female connector is a part to which a male connector of a harness that transmits a signal from a collision detection sensor provided separately from the cylinder type gas generator 1A is connected. A shorting clip (not shown) is attached to the female connector as necessary. The shorting clip is attached to prevent the cylinder type gas generator 1A from malfunctioning due to electrostatic discharge or the like during the transportation of the cylinder type gas generator 1A. In the stage, the male connector of the harness is inserted into the female connector, so that the contact with the terminal pin 42 is released.

  Next, the operation | movement at the time of the action | operation of the cylinder type gas generator 1A demonstrated above is demonstrated. When a vehicle equipped with an airbag device incorporating the cylinder-type gas generator 1A according to the present embodiment collides, the collision is detected by a collision detection means provided separately in the vehicle, and ignition is performed based on this. The device 40 is activated. When the igniter 40 is actuated, the pressure in the ignition unit 41 is increased by combustion of the igniting agent, whereby the ignition unit 41 is ruptured and the flame flows out of the ignition unit 41. The explosive charge 37 accommodated in the ignition chamber 16 is ignited and burned by the flame generated by the operation of the igniter 40, and generates a large amount of heat particles. Due to the combustion of the transfer agent 37, the pressure in the transfer chamber 36 rises, whereby the cup-shaped member 35 is ruptured, and the above-described heat particles reach the cushion material 51. The thermal particles that have reached the cushion material 51 burn the cushion material 51 to open or divide it, whereby the thermal particles flow into the combustion chamber 17 and reach the gas generating agent 52.

  Due to the flowing heat particles, the gas generating agent 52 is ignited and burned to generate a large amount of gas. Due to the combustion of the gas generating agent 52, the pressure in the combustion chamber 17 rises, whereby the sealing of the communication hole 13 a by the covering portion 14 is released, and the generated gas flows into the filter chamber 18. The gas that has flowed in flows through the hollow opening 53a of the filter 53, is then cooled to a predetermined temperature via the filter 53, and is ejected from the gas outlet 11 to the outside of the cylinder type gas generator 1A. The The gas ejected from the gas ejection port 11 is guided into the airbag to inflate and deploy the airbag.

  FIG. 3 is an enlarged cross-sectional view of region III shown in FIG. FIG. 4 is a view showing the structure of the partition member shown in FIGS. 2 and 3 in a non-assembled state. 4A is a perspective view when the partition member is viewed from the front side of the partition member that is located on the filter chamber side after assembly, and FIG. 4B is the view after assembly. It is a perspective view at the time of seeing the said partition member from the back side of the partition member which will be located in the combustion chamber side in FIG. FIG. 4C is a longitudinal sectional view of the partition member. Next, with reference to these FIG. 2 thru | or FIG. 4, the structure of the partition member of the cylinder type gas generator in this Embodiment and its assembly structure are demonstrated in detail.

  As shown in FIGS. 2 to 4, the partition member 12 </ b> A is made of a disk-shaped plate member, and has a base portion 13 and a covering portion 14. The base part 13 is comprised with metal members, such as stainless steel and steel, and has the communicating hole 13a extended in the axial direction in the center. The covering portion 14 is preferably made of a member made of a relatively soft polymer material and covers a predetermined position of the metal base portion 13.

  Specifically, as shown in FIGS. 4 (A) and 4 (B), the covering portion 14 made of a polymer material is the main surface of the base portion 13 that will be located on the filter chamber 18 side after assembly. And the surface of the portion of the base portion 13 excluding the inner peripheral surface of the communication hole 13 a provided in the base portion 13. The covering portion 14 made of a polymer material includes a first seal portion 14a and a second seal portion 14b extending continuously from the first seal portion 14a. That is, the first seal portion 14a and the second seal portion 14b constitute a part of the coating portion 14 made of a polymer material that is formed as one member. Here, the first seal portion 14 a corresponds to a portion that covers the periphery of the base portion 13, and the second seal portion 14 b corresponds to a portion that covers the main surface of the base portion 13 on the combustion chamber 17 side. Examples of the polymer material constituting the covering portion 14 include a hard resin material typified by a polyolefin resin such as polypropylene and polyethylene, a polyamide resin, and a soft material typified by a polyolefin-based, polyester-based, and polyurethane-based elastomer material. Resin materials, synthetic resin materials such as silicone resins and fluororesins, and olefin-based, silicone-based, and fluorine-based rubber materials represented by EPDM are preferably used.

  The covering portion 14 made of a polymer material is preferably integrated with the base portion 13 by insert molding. When the covering portion 14 is provided integrally with the base portion 13 using the insert molding, the covering portion 14 made of a polymer material is fixed to the base portion 13 and is partitioned in advance before the assembly work. 12A can be configured as one member. Therefore, if comprised in this way, the handleability of 12 A of partition members will improve, and the operation | work at the time of an assembly | attachment can be aimed at.

  As shown in FIG. 4C, the periphery of the base 13 is formed in a tapered shape so that the thickness in the axial direction decreases as it goes radially outward. The first seal portion 14a of the coating portion 14 made of a polymer material is provided so as to cover the periphery of the base portion 13 configured in this tapered shape. Here, the 1st seal | sticker part 14a is formed in the thickness by which a sealing performance is ensured by compressing after an assembly | attachment. From the above viewpoint, it is preferable that the thickness of the first seal portion 14a is adjusted to approximately 0.02 mm to 2.0 mm, although it varies slightly depending on the material. In the case where the coating portion 14 made of a polymer material is integrally formed with the base portion 13 by insert molding, the above thickness can be easily realized by adjusting the shape of the mold, particularly the dimensions.

  On the other hand, as shown in FIG. 4C, a second seal portion 14b is provided on the main surface of the base portion 13 located on the combustion chamber 17 side after assembly so as to cover the entire surface. The second seal portion 14 b is provided so as to cover the opening surface of the communication hole 13 a provided in the base portion 13 on the combustion chamber 17 side, and the thickness thereof is the combustion chamber 17 generated by the gas generating agent 52 burning. As the internal pressure rises, the second seal portion 14b is broken without delay, or the second seal portion 14b is melted without delay by heat generated by burning the gas generating agent 52. . From the above viewpoint, it is preferable that the thickness of the second seal portion 14b is adjusted to approximately 0.02 mm to 2.0 mm, although it varies slightly depending on the material. In the case where the coating portion 14 made of a polymer material is integrally formed with the base portion 13 by insert molding, the above thickness can be easily realized by adjusting the shape of the mold, particularly the dimensions.

  As shown in FIG. 3, in a state where the partition member 12A is inserted into the cylindrical member 10 and fixed by caulking (that is, a state after assembly), the diameter of the cylindrical member 10 is reduced toward the predetermined portion. The partition member 12 </ b> A is sandwiched and fixed in the axial direction by the pair of caulking portions 10 </ b> B formed by doing so. Here, each of the pair of caulking portions 10B comes into pressure contact with the tapered portion at the periphery of the partition member 12A, and the first seal portion 14a of the covering portion 14 made of the polymer material is caulked portion 10B of the cylindrical member 10. And the base portion 13 of the partition member 12A, and are sandwiched and compressed by these portions. And the said 1st seal | sticker part 14a is clamped by the cylindrical member 10 and the base 13, and exhibits the sealing performance in the said part. Here, the first seal portion 14a is provided over the entire circumference of the peripheral edge of the partition member 12A, whereby a seal process to be performed between the cylindrical member 10 and the peripheral edge of the partition member 12A is performed. 14a.

  The compression ratio of the first seal portion 14a compressed by the caulking process is preferably about 8% to 40%. If the 1st seal part 14a is compressed within the range of the above-mentioned compression rate, the seal nature in the part concerned can be maintained stably over a long period of time.

  On the other hand, the second seal portion 14b of the covering portion 14 made of the polymer material closes the communication hole 13a provided in the base portion 13 as described above. Therefore, the sealing process in the part is realized by the second seal portion 14b.

  By using the cylinder type gas generator 1A as in the present embodiment described above, the space between the combustion chamber 17 and the filter chamber 18 which is the space inside the cylindrical member 10 partitioned by the partition member 12A. Airtightness is ensured by the coating portion 14 made of a polymer material provided on the partition member 12A. Thereby, it is possible to prevent the outside air containing moisture from entering the combustion chamber 17 in which the gas generating agent 52 is accommodated from the filter chamber 18 communicating with the external space via the gas outlet 11, and the gas generating agent 52 absorbs moisture. Can be prevented. On the other hand, the first seal portion 14a of the covering portion 14 made of the polymer material is sandwiched between the peripheral edge of the base portion 13 of the partition member 12A and the cylindrical member 10, and thereby the sealing process to be performed between these members. Is realized by the first seal portion 14a, and the communication hole 13a provided in the partition member 12A is closed by the second seal portion 14b of the covering portion 14 made of the polymer material. Thus, the sealing process to be performed on the communication hole 13a is realized by the second seal portion 14b. Therefore, the highly reliable cylinder type gas generator 1A can be manufactured at low cost.

  Further, like the cylinder type gas generator 1A in the present embodiment described above, the periphery of the base portion 13 of the partition member 12A is tapered in cross section so that the periphery of the base portion 13 of the partition member 12A and the cylindrical member 10 Since it is possible to ensure a larger size of the first seal portion 14a in the sandwiched portion, a more reliable sealing process can be realized.

  In the above description, the case where the coating portion 14 made of a polymer material is provided on the entire surface of the partition member 12A excluding the main surface on the filter chamber 18 side and the inner peripheral surface of the communication hole 13a will be described as an example. However, the site | part which provides the coating | coated part 14 and the shape of the base 13 are not limited to the above forms. Below, some suitable modifications of 12 A of partition members are illustrated.

  5 (A) to 5 (D) are cross-sectional views showing modifications of the partition member of the cylinder type gas generator in the present embodiment.

  The partition member 12A1 according to the first modification shown in FIG. 5A is located on the combustion chamber 17 side and the portion that is located on the combustion chamber 17 side after assembly of the periphery of the base portion 13. The main surface is covered with a coating portion 14 made of a polymer material. Even in such a configuration, the same effect as described above can be obtained.

  In addition, the partition member 12A2 according to the second modification shown in FIG. 5B covers the entire surface of the base portion 13 except the inner peripheral surface of the communication hole 13a with the coating portion 14 made of a polymer material. The covering portion 14 made of a polymer material covers the periphery of the base portion 13 (that is, the main surface of the base portion 13 and the main surface on the filter chamber 18 side, which are located on the combustion chamber 17 side after assembly). Configuration). Even in such a configuration, the same effect as described above can be obtained.

  Further, the partition member 12A3 according to the third modified example shown in FIG. 5C is provided with a stepped portion at a portion that is located on the combustion chamber 17 side after assembly of the peripheral edge of the base portion 13, and the step The covering portion 14 made of the polymer material is formed so that the first seal portion 14a of the covering portion 14 made of the polymer material protrudes and is located outside the peripheral edge of the base portion 13 in the radial direction. In addition, the main surface, which is located on the combustion chamber 17 side, is covered with a coating portion 14 made of a polymer material. Even in such a configuration, the same effect as described above can be obtained.

  Further, in the partition member 12A4 according to the fourth modified example shown in FIG. 5D, a step portion is provided in a portion of the peripheral edge of the base portion 13 that is located on the combustion chamber 17 side after assembly. The first seal portion 14a of the covering portion 14 made of a polymer material is formed so as to fill the step portion, and the main surface that is located on the combustion chamber 17 side is covered with the covering portion 14 made of the polymer material. This is a configuration. Even in such a configuration, the same effect as described above can be obtained.

  Various configurations other than the above-described modified examples can be adopted. For example, it is possible to configure the base 13 so that the periphery of the base portion 13 does not have a tapered cross section, but the cross section of the base portion 13 has a rectangular shape, and the corner portion of the peripheral portion can have a curved shape. It is. Also in these cases, the peripheral edge of the base portion 13 is covered with the first seal portion 14a of the covering portion 14 made of the polymer material as described above, and the opening surface of the communication hole 13a provided in the base portion 13 on the combustion chamber 17 side. By covering the surface with the second seal portion 14b of the covering portion 14 made of a polymer material, the same effect as described above can be obtained.

  Furthermore, in the above-described embodiment, the case where the coating portion 14 made of the polymer material is integrally formed with the base portion 13 by insert molding has been described as an example, but such a configuration is not necessarily provided. It is not necessary to adopt, and the covering portion 14 made of a polymer material may be formed separately from the base portion 13, and may be used by being fitted into the base portion 13 and integrated. In addition, in order to handle the metal base 13 and the polymer coating 14 formed as separate members as one member at the time of assembly, these members may be joined by bonding or welding. Good.

(Embodiment 2)
FIG. 6 is an enlarged cross-sectional view of the vicinity of the partition member of the cylinder type gas generator in Embodiment 2 of the present invention. Moreover, FIG. 7 is a figure which shows the structure in the non-assembly | attachment state of the partition member shown in FIG. 7A is a perspective view when the partition member is viewed from the front side of the partition member that is located on the filter chamber side after assembly, and FIG. 7B is the view after assembly. It is a perspective view at the time of seeing the said partition member from the back side of the partition member which will be located in the combustion chamber side in FIG. FIG. 7C is a longitudinal sectional view of the partition member. Below, with reference to these FIG. 6 and FIG. 7, the structure of the partition member of the cylinder type gas generator in this Embodiment and its assembly structure are demonstrated. In addition, the same code | symbol is attached | subjected in the figure about the part similar to cylinder type gas generator 1A in above-mentioned Embodiment 1, and the partition member 12A with which this is provided, and the description is not repeated here.

  As shown in FIGS. 6 and 7, the partition member 12 </ b> B is made of a disk-shaped plate member, and has a base portion 13 and a covering portion 15. The base part 13 is comprised with metal members, such as stainless steel and steel, and has the communicating hole 13a extended in the axial direction in the center. The covering portion 15 covers a predetermined position of the base portion 13 and is made of a metal member. As the material of the covering portion 15, it is preferable to select a material having the same hardness as the material of the base portion 13 or the cylindrical member 10 or a hardness smaller than that. In addition, the hardness said here refers to Vickers hardness, Rockwell hardness, etc. Further, in addition to the above-mentioned hardness conditions, if the material of the covering portion 15 is selected to be the same as the material of the base 13 or the cylindrical member 10 or a material having a larger amount of elongation than that, It is preferable.

  Specifically, as shown in FIGS. 7 (A) and 7 (B), the metal covering portion 15 includes a main surface of the base portion 13 that is positioned on the filter chamber 18 side after assembly, It is provided so as to cover the surface of the base portion 13 except for the inner peripheral surface of the communication hole 13 a provided in the base portion 13. The metal covering portion 15 includes a first seal portion 15a and a second seal portion 15b extending continuously from the first seal portion 15a. That is, the first seal portion 15a and the second seal portion 15b constitute a part of the metal covering portion 15 formed as one member. Here, the first seal portion 15 a corresponds to a portion that covers the periphery of the base portion 13, and the second seal portion 15 b corresponds to a portion that covers the main surface of the base portion 13 on the combustion chamber 17 side. As a metal material constituting the covering portion 15, aluminum, copper, an aluminum alloy, a copper alloy, or the like is preferably used. That is, it is preferable to use a member generally called an aluminum foil or a copper foil.

  The metal covering portion 15 is attached to the base portion 13 by adhesion or the like in a non-assembled state. As described above, if the metal covering portion 15 is attached to the base portion 13 in advance, the partition member 12B can be configured in advance as one member before the assembling work. Therefore, if comprised in this way, the handleability of the partition member 12B will improve and the operation | work at the time of an assembly | attachment can be facilitated.

  As shown in FIG. 7C, the peripheral edge of the base portion 13 is formed in a tapered shape so that the thickness in the axial direction decreases as it goes radially outward. The first seal portion 15a of the metal covering portion 15 is provided so as to cover the peripheral edge of the base portion 13 configured in this tapered shape. Here, the 1st seal | sticker part 15a is formed in the thickness by which a sealing performance is ensured by distorting after an assembly | attachment. From the above viewpoint, the thickness of the first seal portion 15a is preferably adjusted to approximately 0.05 mm to 0.8 mm, although it varies slightly depending on the material.

  On the other hand, as shown in FIG. 7C, a second seal portion 15b is provided on the main surface of the base portion 13 located on the combustion chamber 17 side after assembly so as to cover the entire surface. The second seal portion 15 b is provided so as to cover the opening surface of the communication hole 13 a provided in the base portion 13 on the combustion chamber 17 side, and the thickness thereof is the combustion chamber 17 that is generated when the gas generating agent 52 burns. The second seal portion 15b is formed with such a thickness that it can be broken without delay as the internal pressure rises. From the above viewpoint, the thickness of the second seal portion 15b is preferably adjusted to approximately 0.02 mm to 2.0 mm, although it varies slightly depending on the material.

  As shown in FIG. 6, in a state where the partition member 12B is inserted into the cylindrical member 10 and fixed by caulking (that is, a state after assembly), the diameter of the cylindrical member 10 is reduced toward a predetermined portion. Thus, the partition member 12B is sandwiched and fixed in the axial direction by the pair of caulking portions 10B formed. Here, each of the pair of caulking portions 10B comes into pressure contact with the tapered portion on the peripheral edge of the partition member 12B, and the first seal portion 15a of the metal covering portion 15 is separated from the caulking portion 10B of the cylindrical member 10. It is interposed between the base portion 13 of the member 12A and is sandwiched by these portions to be distorted. And the said 1st seal | sticker part 15a will be clamped by the cylindrical member 10 and the base 13, and will exhibit a sealing performance in the said part. Here, the first seal portion 15a is provided over the entire circumference of the peripheral edge of the partition member 12A, so that a sealing process to be performed between the cylindrical member 10 and the peripheral edge of the partition member 12A is performed in the first seal portion. This is realized by 15a.

  Here, it is preferable that the strain value of the first seal portion 15a, which is distorted by the caulking process, is set to a strain value of 0.2% or more with respect to the initial state. If the first seal portion 15a is distorted so as to have the strain value or more, the sealing performance at the portion can be stably maintained over a long period of time.

  On the other hand, the second seal portion 15b of the metal covering portion 15 closes the communication hole 13a provided in the base portion 13 as described above. Therefore, the sealing process in the part is realized by the second seal portion 15b.

  By adopting the configuration described above, the partition member 12B is provided with airtightness between the combustion chamber 17 and the filter chamber 18, which is a space inside the cylindrical member 10 partitioned by the partition member 12B. It is ensured by the metal covering portion 15. Thereby, it is possible to prevent the outside air containing moisture from entering the combustion chamber 17 in which the gas generating agent 52 is accommodated from the filter chamber 18 communicating with the external space via the gas outlet, and the gas generating agent 52 absorbs moisture. Can be prevented. On the other hand, the first seal portion 15a of the metal covering portion 15 is sandwiched between the peripheral edge of the base portion 13 of the partition member 12A and the cylindrical member 10, and thus the sealing process to be performed between these members is described above. In addition to being realized by the first seal portion 15a, the communication hole 13a provided in the partition member 12B is closed by the second seal portion 15b of the metal covering portion 15, and thus the communication hole The sealing process to be performed on 13a is realized by the second seal portion 15b. Therefore, a highly reliable cylinder type gas generator can be manufactured at low cost.

  Further, as described above, the peripheral edge of the base portion 13 of the partition member 12B is tapered in cross section, whereby the size of the first seal portion 15a at the portion sandwiched between the peripheral edge of the base portion 13 of the partition member 12B and the cylindrical member 10 is obtained. Since it is possible to secure a larger value, a more reliable sealing process can be realized.

  In the above description, the case where the metal covering portion 15 is provided on the entire surface of the partition member 12B except the main surface on the filter chamber 18 side and the inner peripheral surface of the communication hole 13a has been described. The portion where the covering portion 15 is provided and the shape of the base portion 13 are not limited to the form as described above. Below, some suitable modifications of partition member 12B are illustrated.

  FIG. 8A to FIG. 8D are cross-sectional views showing modifications of the partition member of the cylinder type gas generator in the present embodiment.

  The partition member 12B1 according to the first modification shown in FIG. 8A includes a peripheral edge of the base portion 13, the entire main surface of the base portion 13 that is positioned on the combustion chamber 17 side after assembly, and a bottom plate filter chamber. The outer peripheral portion of the main surface that is located on the 18th side is covered with a metal covering portion 15. Even in such a configuration, the same effect as described above can be obtained.

  Further, the partition member 12B2 according to the second modified example shown in FIG. 8B includes a portion that is located on the combustion chamber 17 side after assembly of the peripheral edge of the base portion 13, and the combustion chamber 17 side. The main surface to be positioned is covered with a metal covering portion 15. Even in such a configuration, the same effect as described above can be obtained.

  Further, in the partition member 12B3 according to the third modification shown in FIG. 8C, the peripheral edge of the base portion 13 and the main surface that is positioned on the bottom plate combustion chamber 17 side are covered with the metal covering portion 15. It is a configuration. Here, the peripheral edge of the base 13 is provided with a concave portion extending in the circumferential direction, and a corresponding portion of the metal covering portion 15 is caulked so as to be engaged with the concave portion. Even in such a configuration, the same effect as described above can be obtained. If the above-described caulking is adopted, the metal covering portion 15 can be easily fixed to the base portion 13.

  Further, in the partition member 12B4 according to the fourth modified example shown in FIG. 8D, the corner portion of the peripheral portion of the base portion 13 has a curved shape and is positioned on the peripheral edge of the base portion 13 and the bottom plate combustion chamber 17 side. In this configuration, the entire main surface and the outer peripheral portion of the main surface located on the bottom plate filter chamber 18 side are covered with a metal covering portion 15. Even in such a configuration, the same effect as described above can be obtained.

  Various configurations other than the above-described modified examples can be adopted. For example, the base 13 can be configured so that the cross-sectional shape thereof is rectangular. Also in this case, the periphery of the base portion 13 is covered with the first seal portion 15a of the metal covering portion 15 as described above, and the opening surface of the communication hole 13a provided in the base portion 13 on the combustion chamber 17 side is made of metal. By making it the structure covered with the 2nd seal | sticker part 15b of the coating | coated part 15, the effect similar to the above-mentioned effect can be acquired.

  Furthermore, in the above-described embodiment and its modifications, the case where the metal covering portion 15 is attached to the base portion 13 by bonding or caulking has been described as an example. There is no need to adopt a configuration. For example, a configuration in which the metal covering portion 15 is previously attached to the base portion 13 by using another joining method (for example, welding) may be adopted, or these members are not particularly joined in advance. These members may be simply overlapped at the time of attachment.

(Embodiment 3)
FIGS. 9A and 9B are diagrams showing an external structure of a T-shaped gas generator according to Embodiment 3 of the present invention, FIG. 9A is a front view, and FIG. 9B is a top view. FIG. 10 is a diagram showing the internal structure of the T-shaped gas generator in the present embodiment, and is a cross-sectional view taken along line XX shown in FIG. 9 (B). In addition, the same code | symbol is attached | subjected in the figure about the part similar to the cylinder type gas generator 1A in the above-mentioned Embodiment 1, and the description is not repeated here.

  As shown in FIGS. 9 (A), 9 (B), and 10, the T-shaped gas generator 1B in the present embodiment has a long and substantially cylindrical outer shape, and a pair of cylindrical shapes. The member 10, the pair of closing members 20, the connecting member 60, and the base member 30 are included. Each of the pair of cylindrical members 10 is composed of a long member having an opening at one end in the axial direction and a bottom plate 10a at the other end. The bottom plate 10a is formed, for example, by joining a disk-shaped plate member to the other end of the cylindrical member 10 by welding or the like. Each of the pair of closing members 20 is made of a disk-shaped member having a predetermined thickness, and has a groove 21 for caulking and fixing on the peripheral surface thereof. The connecting member 60 is composed of a T-shaped hollow tube and has open ends on three sides thereof. The base member 30 is made of a cylindrical member having a hollow portion, and has a groove 31 for caulking and fixing at a predetermined position on the outer peripheral surface thereof. In addition, the said connection member 60 consists of metal members, such as stainless steel, steel, an aluminum alloy, a stainless alloy, like another member.

  The end portions on the bottom side of the pair of cylindrical members 10 are respectively inserted into the pair of open ends at the positions where the connecting members 60 face each other, and the connecting members 60 and the pair of cylindrical members are inserted. 10 is fixed by being welded by a welding portion 61. On the other hand, the base member 30 is fixed by caulking to the remaining open end of the connecting member 60. For the caulking and fixing of the base member 30 to the connecting member 60, an eight-side caulking according to the base member 30 for the cylindrical member 10 described in the first embodiment is employed.

  A closing member 20 is attached and fixed to each of the opening ends of the pair of cylindrical members 10 so as to close the opening ends. For the caulking and fixing of the closing member 20 to the cylindrical member 10, the eight-side caulking described in the first embodiment is employed.

  Each of the pair of cylindrical members 10 has a disk-like partition member 12A inserted therein and fixed at a predetermined position in the axial direction thereof. Here, the structure of the partition member 12A and its assembly structure are the same as those of the partition member of the cylinder type gas generator 1A in the first embodiment.

  A gas outlet 11 is provided on each of the peripheral walls in the vicinity of the end of the pair of cylindrical members 10 on the side where the closing member 20 is attached. The gas ejection port 11 is a hole for ejecting the gas generated inside the T-shaped gas generator 1B to the outside, and a plurality of gas ejection ports 11 are provided along the circumferential direction and the axial direction of the cylindrical member 10. .

  The space inside the T-shaped gas generator 1B defined by the pair of cylindrical members 10, the pair of closing members 20, the connecting member 60, and the base member 30 includes an ignition chamber 16, a pair of combustion chambers 17, and a pair of A filter chamber 18 is provided. The partition member 12 </ b> A described above partitions the combustion chamber 17 and the filter chamber 18 inside each cylindrical member 10. On the other hand, the ignition chamber 16 and each of the pair of combustion chambers 17 are partitioned by respective bottom plates 10 a of the pair of cylindrical members 10.

  The ignition chamber 16 is mainly defined by the connecting member 60, the bottom plate 10a of each of the pair of cylindrical members 10, and the base member 30, and is provided at the center of the T-shaped gas generator 1B. In the cylinder type gas generator 1A in the first embodiment described above, the cup-shaped member 35 is attached to the base member 30 so as to cover the ignition part 41 of the igniter 40, but in the T-shaped in the present embodiment. Such a cup-shaped member is not attached to the base member 30 in the gas generator 1B. An igniter 40 is attached to the hollow portion of the base member 30. Further, a transfer charge 37 is accommodated in the ignition chamber 16.

  Each bottom plate 10a of the pair of cylindrical members 10 is provided with a communication hole 10b for communicating the ignition chamber 16 and the combustion chamber 17 during operation. A seal member 10c is affixed to the main surface of the pair of bottom plates 10a located on the ignition chamber 16 side so as to close the communication hole 10b. As the sealing member 10c, an aluminum foil or the like having an adhesive member applied on one side is used. As a result, airtightness between the ignition chamber 16 and the combustion chamber 17 during non-operation is ensured, and mixing of moisture and the like into the ignition chamber 16 and the combustion chamber 17 is prevented.

  The pair of combustion chambers 17 are respectively defined by the peripheral wall of the cylindrical member 10, the bottom plate 10a, and the partition member 12A, and are provided at positions where the above-described ignition chamber 16 is sandwiched in the axial direction. A gas generating agent 52 is mainly accommodated in each of the pair of combustion chambers 17. A cushion material 51 is disposed on the main surface of the bottom plate 10a of the cylindrical member 10 on the combustion chamber 17 side.

  The pair of filter chambers 18 are respectively defined by the cylindrical member 10, the closing member 20, and the partition member 12 </ b> A. It has been. A filter 53 having a hollow opening 53 a extending in the same direction as the axial direction of the cylindrical member 10 is accommodated in each of the pair of filter chambers 18. Each of the pair of filter chambers 18 communicates with the outside via the gas outlets 11 provided on the peripheral walls of the pair of cylindrical members 10 described above.

  Next, the operation | movement at the time of the action | operation of the T-shaped gas generator 1B demonstrated above is demonstrated. When a vehicle equipped with an airbag device incorporating the T-shaped gas generator 1B in the present embodiment collides, the collision is detected by a collision detection means provided separately in the vehicle, and based on this The igniter 40 is activated. When the igniter 40 is actuated, the pressure in the ignition unit 41 is increased by combustion of the igniting agent, whereby the ignition unit 41 is ruptured and the flame flows out of the ignition unit 41. The explosive charge 37 accommodated in the ignition chamber 16 is ignited and burned by the flame generated by the operation of the igniter 40, and generates a large amount of heat particles. Due to the combustion of the charge transfer agent 37, the pressure in the ignition chamber 16 increases, whereby the seal of the seal member 10c is broken, and the above-described hot particles are located on both sides of the ignition chamber 16 through the communication hole 10b. Flows into each of the combustion chambers 17. The flowing heat particles reach the cushion material 51, burn the cushion material 51, open or divide it, and reach the gas generating agent 52, respectively.

  The flowing heat particles ignite and burn the gas generating agent 52 in each of the pair of combustion chambers 17 located on both sides of the ignition chamber 16 to generate a large amount of gas. Due to the combustion of the gas generating agent 52, the pressure in the pair of combustion chambers 17 increases, whereby the sealing of the communication hole 13 a by the covering portion 14 is released, and the generated gas flows to each of the pair of filter chambers 18. And flow into. And the gas which flowed in flows through the hollow opening part 53a of the filter 53, and is cooled to predetermined temperature via the filter 53 after that, and it goes out of the T-shaped gas generator 1B from the gas ejection port 11, respectively. Erupted. The gas ejected from the gas ejection port 11 is guided into the airbag to inflate and deploy the airbag. As described above, in the T-shaped gas generator 1B in the present embodiment, different gas outputs can be obtained from both ends in the axial direction of the housing by using a single igniter.

  As described above, also in the T-shaped gas generator 1B in the present embodiment, the structure of the partition member 12A similar to the structure adopted in the cylinder-type gas generator 1A in the above-described first embodiment and the assembly structure thereof Is adopted. For this reason, it is possible to prevent the outside air containing moisture from entering the combustion chamber 17 in which the gas generating agent 52 is accommodated from the filter chamber 18 communicating with the external space via the gas outlet 11, and the gas generating agent 52 absorbs moisture. Can be prevented. On the other hand, the first seal portion 14a of the covering portion 14 made of the polymer material is sandwiched between the peripheral edge of the base portion 13 of the partition member 12A and the cylindrical member 10, and thereby the sealing process to be performed between these members. Is realized by the first seal portion 14a, and the communication hole 13a provided in the partition member 12A is closed by the second seal portion 14b of the covering portion 14 made of the polymer material. Thus, the sealing process to be performed on the communication hole 13a is realized by the second seal portion 14b. Therefore, a highly reliable T-shaped gas generator 1B can be manufactured at low cost.

  In the T-shaped gas generator 1B in the present embodiment, the structure of the partition member 12A and the assembly structure thereof similar to the structure employed in the cylinder-type gas generator 1A in the first embodiment described above are employed. Although the case has been described as an example, instead of this, the structure of the partition member 12B and its assembly structure as shown in the second embodiment may be adopted. In that case, the same effect can be obtained.

  In the above-described first to third embodiments and the modifications thereof, the entire main surface located on the combustion chamber side of the partition member is covered with the second seal portion of the covering portion after assembly, and the communication hole provided in the base portion The case of adopting a configuration in which the opening surface located on the combustion chamber side is closed by the second seal portion of the covering portion has been described as an example, but after assembly, the main surface located on the filter side of the partition member A configuration may be adopted in which the entire surface is covered with the second seal portion of the covering portion and the opening surface located on the filter side of the communication hole provided in the base portion is closed with the second seal portion of the covering portion. Moreover, it is good also as a structure which covers the surface of these both sides with the 2nd seal part of a coating | coated part.

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

It is a figure which shows the external appearance structure of the cylinder type gas generator in Embodiment 1 of this invention, (A) is a front view, (B) is a right view. It is a figure which shows the internal structure of the cylinder type gas generator in Embodiment 1 of this invention, and is sectional drawing along the II-II line shown to FIG. 1 (A) and FIG. 1 (B). It is an expanded sectional view of the area | region III shown in FIG. It is a figure which shows the structure of the partition member shown in FIG.2 and FIG.3, (A) and (B) are perspective views, (C) is a longitudinal cross-sectional view. It is sectional drawing which shows the modification of the partition member of the cylinder type gas generator in Embodiment 1 of this invention. It is an expanded sectional view of the partition member vicinity of the cylinder type gas generator in Embodiment 2 of this invention. It is a figure which shows the structure of the partition member shown in FIG. 6, (A) and (B) are perspective views, (C) is sectional drawing. It is sectional drawing which shows the modification of the partition member of the cylinder type gas generator in Embodiment 2 of this invention. It is a figure which shows the external appearance structure of the T-shaped gas generator in Embodiment 3 of this invention, (A) is a front view, (B) is a top view. It is a figure which shows the internal structure of the T-shaped gas generator in Embodiment 3 of this invention, and is sectional drawing along the XX line shown to FIG. 9 (B).

Explanation of symbols

  1A cylinder type gas generator, 1B T-shaped gas generator, 10 cylindrical member, 10a bottom plate, 10b communication hole, 10c sealing member, 11 gas outlet, 12A, 12A1-12A4, 12B, 12B1-12B4 partition member, 13 base part, 13a communication hole, 14 (made of polymer material) cover part, 14a first seal part, 14b second seal part, 15 (made of metal) cover part, 15a first seal part, 15b second seal part , 16 Ignition chamber, 17 Combustion chamber, 18 Filter chamber, 19 Perforated plate, 19a Communication hole, 20 Closing member, 21 Groove, 30 Base member, 31 Groove, 32 Hollow portion, 33 Recessed portion, 34 Resin molded portion, 35 Cup shape Member, 36 Transfer chamber, 37 Transfer agent, 38 Seal member, 40 Igniter, 41 Ignition part, 42 Terminal pin, 51 Cushion material, 52 Scan generator, 53 a filter, 53a hollow opening 60 connecting member, 61 welds.

Claims (6)

A long metal cylindrical member containing therein a combustion chamber containing a gas generating agent and a filter chamber containing a filter;
A partition member that is located inside the cylindrical member and divides a space inside the cylindrical member into the combustion chamber and the filter chamber in the axial direction;
An igniter positioned on the combustion chamber side when viewed from the partition member,
The partition member includes a metal base portion provided with a communication hole that communicates the combustion chamber and the filter chamber, and a covering portion provided to cover at least a part of the surface of the base portion. Including
The peripheral edge of the partition member is sandwiched in the axial direction of the cylindrical member by a pair of caulking portions provided at positions sandwiching the partition member by reducing the diameter of the peripheral wall of the cylindrical member inward in the radial direction. Fixed to the cylindrical member by
The covering portion extends continuously from the first seal portion interposed between the periphery of the base portion and the caulking portion, and the opening surface of the communication hole on the combustion chamber side or the filter. A gas generator comprising: a second seal portion that closes at least one of the chamber-side opening surfaces.   The gas generator according to claim 1, wherein the covering portion is constituted by a member made of a polymer material.   The gas generator according to claim 2, wherein the covering portion is formed by integral molding with respect to the base portion so as to be fixed to the surface of the base portion.   The gas generator according to claim 1, wherein the covering portion is made of a metal member.   The gas generator according to claim 4, wherein the covering portion is attached to the base portion so as to cover a surface of the base portion. The peripheral edge of the base is configured in a tapered shape so that the thickness in the axial direction decreases as it goes radially outward,
The gas generator according to claim 1, wherein the first seal portion covers a tapered portion of the base portion.

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