Airbag device

Abstract

To provide an air bag device which can expand an air bag with a relatively large capacity with a configuration simpler than a conventional one.SOLUTION: An air bag device 100 comprises: an air bag; a tubular outside air introduction part 104 which has an inner side opening 104b located inside the air bag and an outer side opening located outside the air bag, and which makes the inside communicate to the outside of the air bag; an inflow pipe 103 which has an inflow port 103b of gas provided adjacent to the inner side opening 104b on one end thereof; and a gas generator 101 which is provided on the other end side of the inflow pipe 103 and supplies gas into the air bag via the inflow port 103b from the other end side of the inflow port 103 in the time of operation. The inflow port 103b is an annular port in such a state that a space is provided between the inner side opening 104b and itself in the periphery of the inner side opening 104b.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an airbag device as an occupant protection device mounted on an automobile or the like. [Background technology]

[0002] This airbag device deploys a relatively large capacity airbag, and the airbag is arranged in a predetermined location in the vehicle cabin, inflated by gas from an inflator, and the airbag is fixed to a case or the like together with the inflator. In this airbag device, a tube is inserted into an airbag retainer that fixes the airbag to the case, and the tube forms an intake / exhaust pipe that connects the inside of the airbag to the atmosphere in the vehicle cabin, and a fixing means for the airbag is provided on the atmosphere side of the tube. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 07-291085 Summary of the Invention [Problem to be solved by the invention]

[0004] However, although the airbag devices typified by the above-mentioned patent documents are capable of introducing outside air into the airbag immediately after activation, it is considered difficult to deploy a relatively large airbag unless the output of the gas generator is increased in accordance with the size of the airbag.

[0005] Therefore, an object of the present invention is to provide an airbag device that can deploy a relatively large-capacity airbag by actively utilizing the working gas of the gas generator to introduce outside air into the airbag, without having to increase the output of the gas generator in accordance with the size of the airbag. [Means for solving the problem]

[0006] (1) An airbag device of the present invention comprises: an airbag; an air intake section having an interior opening located inside the airbag and an exterior opening located outside the airbag, the air intake section being tubular and communicating the interior and exterior of the airbag; an inlet pipe having a gas inlet at one end provided adjacent to the interior opening; and a gas generator provided at the other end of the inlet pipe, which supplies gas into the airbag from the other end of the inlet pipe via the inlet when activated. The inlet is an annular opening around the outside of the inner opening, with a space between the inner opening and the inlet. It is characterized by:

[0008] ( 2 In the airbag device of (1) above, it is preferable that at least one support member is installed between the air inlet and the interior opening to connect and support the air inlet and the interior opening.

[0009] ( 3 In the airbag device of (1) above, the inflow pipe is preferably provided inside the airbag. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide an airbag device that can deploy a relatively large-capacity airbag by actively utilizing the working gas of the gas generator to introduce outside air into the airbag, without having to increase the output of the gas generator in accordance with the size of the airbag. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic perspective view of an airbag device according to a first embodiment of the present invention after deployment. [Figure 2] 2 is a schematic perspective view showing the airbag device of FIG. 1 in a partially exploded state. FIG. [Figure 3] 2 is an enlarged view of the vicinity of an outside air intake portion of the airbag device of FIG. 1. [Figure 4] 2 is a cross-sectional view showing an example of a gas generator used in the airbag device of FIG. 1. FIG. [Figure 5] FIG. 6 is a schematic plan view of an airbag device according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a partial cross-sectional view of the airbag device of FIG. 5. [Figure 7] 6 is a perspective view showing an example of an inlet pipe and an outside air introduction section of the airbag device of FIG. 5. FIG. [Figure 8] 6 is an enlarged cross-sectional view showing an inlet pipe and an outside air introduction portion of the airbag device of FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0012] First Embodiment An airbag device 100 according to a first embodiment of the present invention will be described below with reference to FIGS.

[0013] 1, the airbag device 100 includes a gas generator 101, a base 102, an inlet pipe 103, an outside air introduction section 104, and an airbag 105. Although FIG. 1 shows the airbag 105 in a deployed state, in an initial state, the airbag 105 is folded in a contracted state toward the gas generator 101 side.

[0014] 1 to 3, the outside air introduction section 104 is a tubular member that has an outside opening 104a located outside the airbag 105 and an inside opening 104b located inside the airbag 105, and that connects the inside and outside of the airbag 105. Also, as shown in Fig. 3, the outside air introduction section 104 has at least one support member 104c (four in this embodiment) that connects and supports an inlet 103b (described later) and the inside opening 104b around the inside opening 104b. A midsection of the outside air introduction section 104 is fixed in a state where it is fitted into a hole 103d (described later).

[0015] As shown in FIGS. 1 to 3, inflow pipe 103 is a tubular member curved in a substantially L-shape provided inside airbag 105, and has gas inflow port 103b provided adjacent to interior opening 104b at one end, and has opening 103a at the other end into which one end of gas generator 101 is inserted and fixed. Furthermore, as shown in FIGS. 1 and 2, inflow pipe 103 is formed with hole 103d facing interior opening 104b, into which outside air introduction part 104 can be inserted and fixed from the interior opening 104b side. In the present embodiment, inflow port 103b is an annular opening around interior opening 104b with a space between it and interior opening 104b, but is not limited to this. For example, the inlet 103b may have any configuration, including a tubular member having a diameter smaller than that of the outside air introduction section 104, as long as it has an outlet that can eject the gas supplied from the gas generator 101 adjacent to at least a portion of the inner opening 104b.

[0016] One end of gas generator 101 is fitted and fixed in opening 103a of inflow pipe 103, and is arranged so that, upon activation, gas can be supplied from opening 103a (other end) of inflow pipe 103 into airbag 105 via inlet 103b. The other end of gas generator 101 is fitted and fixed in base 102 having a male connector (not shown) electrically connected to a power source (not shown) or the like via wiring 106. As shown in FIG. 1 , gas generator 101 is arranged so that a portion from its top to a midpoint of its bottom is located inside airbag 105. An example of gas generator 101 will be described below, but the gas generator is not limited to the one shown below and may be any type that is a so-called side inflator.

[0017] As shown in FIG. 4, gas generator 101 has a long, generally cylindrical outer shape, and includes housing 10, holder 20 attached to one open end of housing 10, and closing member 12 attached to the other end of housing 10 so as to close the other open end of housing 10.

[0018] Housing 10 has peripheral walls 10a, 10b, and 10e and is made of a long, cylindrical member having openings at both axial ends. Closing member 12 is made of a disk-shaped member having a predetermined thickness, and has an annular groove 13 on its peripheral surface for fixation by crimping (an example of a diameter-reducing processing method) described below. This annular groove 13 for fixation by crimping is formed on the peripheral surface of closing member 12 so as to extend in the circumferential direction. In addition, gas outlets 11 are provided in the peripheral wall of housing 10 near the end on the side where closing member 12 is attached. These gas outlets 11 are holes for ejecting gas generated inside gas generator 101 to the outside, and a plurality of gas outlets 11 are provided along the circumferential direction of housing 10.

[0019] The closing member 12 is made of a metal such as stainless steel, iron steel, aluminum alloy, or stainless alloy. As shown in Fig. 4, with a part of the closing member 12 inserted into one open end of the housing 10, the peripheral wall 10a of the housing 10, which corresponds to a part of the peripheral surface of the closing member 12, is narrowed radially inward (crimped) to form the annular groove 13, thereby crimping and fixing the closing member 12 to the housing 10.

[0020] Holder 20 is made of a metal such as stainless steel, iron steel, aluminum alloy, or stainless alloy, and has a tapered fitting portion 23 into which igniter 50 fits, an annular groove portion 22 for crimping and fixed formed so as to extend circumferentially on the outer circumferential surface, and a fitting portion 21, on the side opposite to the holding position of igniter 50, into which a female connector (not shown) for supplying electricity to igniter 50 can be fitted. Note that holder 20 is crimped and fixed to housing 10 by reducing (crimping) the diameter of peripheral wall 10e of housing 10 in a portion corresponding to annular groove portion 22 provided on the outer circumferential surface of holder 20 inward in the radial direction and engaging with said annular groove portion 22.

[0021] As described above, a female connector is formed in fitting portion 21 of holder 20. This female connector is a portion to which a male connector (not shown) of base 102, which transmits a signal from collision detection means provided separately from gas generator 101, is connected. A retainer 60 is attached to the female connector. This retainer 60 is attached to prevent malfunction of cylindrical gas generator 101 due to electrostatic discharge or the like when transporting gas generator 101, and at the stage of assembly into airbag device 100, the male connector of the harness is inserted into the female connector, thereby releasing the male connector from contact with terminal pin 52.

[0022] 4, an igniter 50 is disposed at one axial end of the housing 10 (i.e., the portion closer to the holder 20) as an ignition means for the gas generating agent 31. The igniter 50 and the holder 20 that fixes the igniter 50 function as ignition means that generate a flame for burning the granular gas generating agent 31, which will be described later.

[0023] As shown in Fig. 4, igniter 50 is inserted into fitting portion 23 of holder 20 and held together with a substantially cylindrical member 53, which will be described later. More specifically, igniter 50 includes a base frame through which a pair of terminal pins 52 are inserted and which holds the pair, and a squib cup 51 (cup-shaped member) attached to the base frame. A resistor (bridge wire) is attached so as to connect the tips of terminal pins 52 inserted into squib cup 51, and squib cup 51 is filled with an ignition charge so as to surround or be 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 ignition charge. In addition to the ignition charge, a transfer charge may also be filled into squib cup 51. Examples of transfer charges that can be placed together with the ignition charge include a composition consisting of a metal / oxidizer, such as boron / potassium nitrate, a composition consisting of titanium hydride / potassium perchlorate, or a composition consisting of boron / 5-aminotetrazole / potassium nitrate / molybdenum trioxide.

[0024] When a collision is detected, a predetermined amount of current flows through the resistor via terminal pin 52. This current flow through the resistor generates Joule heat, which causes the ignition charge to begin burning. The high-temperature flame generated by the combustion ruptures squib cup 51, which contains the ignition charge. If nichrome wire is used for the resistor, the time from when the current flows through the resistor to when igniter 50 is activated is less than 2 milliseconds.

[0025] Squib cup 51 is generally made of metal or resin. A substantially cylindrical member 53 covers the peripheral wall of squib cup 51 except for the vicinity of the tip, and is fixed together with igniter 50 by crimping to holder 20 with crimping portion 24. Here, substantially cylindrical member 53 is a directional member that directs the direction of the flame generated in igniter 50 upon activation toward cup member 32 (positioning member).

[0026] As shown in FIG. 4, in the internal space of the housing 10, a space 10A in which the gas generating agent 31 and the like are sealed, and a filter 41 are provided in parallel in the axial direction of the housing 10.

[0027] The gas generating agent 31 is a composition that is ignited by a flame generated by ignition by the igniter 50 and burns to generate gas. The gas generating agent 31 is generally formed as a molded body containing a fuel, an oxidizer, and an additive. Examples of fuels that can be used include triazole derivatives, tetrazole derivatives, guanidine derivatives, azodicarbonamide derivatives, hydrazine derivatives, and combinations thereof. Specific examples of suitable fuels include nitroguanidine, guanidine nitrate, cyanoguanidine, and 5-aminotetrazole. Examples of suitable oxidizers include basic metal nitrates such as basic copper nitrate and basic copper carbonate, perchlorates such as ammonium perchlorate and potassium perchlorate, and nitrates containing cations selected from alkali metals, alkaline earth metals, transition metals, and ammonia. Suitable examples of suitable nitrates include sodium nitrate and potassium nitrate. Examples of suitable additives include binders, slag-forming agents, and combustion modifiers. Suitable binders include organic binders such as cellulose derivatives (e.g., hydroxypropylene methyl cellulose), metal salts of carboxymethyl cellulose, and stearates, as well as inorganic binders (e.g., synthetic hydroxytalcite and acid clay). Suitable slag-forming agents include silicon nitride, silica, and acid clay. Suitable combustion-adjusting agents include metal oxides, ferrosilicon, activated carbon, and graphite.

[0028] As shown in Fig. 4, the coil spring 35 is formed by being wound in a spiral shape so that its overall appearance resembles a truncated cone. One end of the coil spring 35 abuts against the squib cup 51, and the other end formed in a spiral abuts against the gas generating agent 31, so as to apply an elastic force to the gas generating agent 31. Due to this biasing force, the gas generating agent 31 is fixed in the housing 10 by being sandwiched between the coil spring 35 and the cup member 32. Furthermore, the coil spring 35 has an overall truncated cone shape whose diameter increases from the igniter 50 side to the gas generating agent 31 side, which makes it easier to direct the direction of the flame emitted from the igniter 50 toward the gas generating agent 31.

[0029] The cup member 32 (positioning member) is a short, bottomed, cylindrical member that covers one end of the filter 41. It includes a cylindrical portion 32a having an annular groove 32a1 and a bottom portion 32b that closes one end of the cylindrical portion 32a. The cup member 32 is fixed to the inner wall of the housing 10 by a diameter-reducing process (described later) performed from the outside of the housing 10 so that the filter 41 can be positioned at a predetermined position (for example, a position facing the gas outlet 11 as shown in FIG. 4). The cylindrical portion 32a is short enough not to close the gas outlet 11. The bottom portion 32b melts or breaks due to the gas generated during operation. The cup member 32 is made of a resin material or a composite reinforced material containing resin. Examples of the resin material or composite reinforced material containing resin include glass fiber-reinforced PA6 (polyamide 6) and POM (polyacetal, polyoxymethylene). As a modified example, the cup member 32 may be made of a metal such as stainless steel or steel, or an alloy such as an aluminum alloy or stainless alloy.

[0030] As shown in FIG. 4 , after the cup member 32 is installed in the housing 10 with one end of the filter 41 fitted into it, the peripheral wall 10b of the housing 10 is narrowed radially inward (crimped) at a portion corresponding to a part of the circumferential surface of the cylindrical portion 32a of the cup member 32 to form the annular groove 32a1 and the annular groove 41b described below, thereby crimping and fixing the cup member 32 to the housing 10 and the filter 41. This prevents generated gas from bypassing between the inner wall of the housing 10 and the outer periphery of the filter 41 and leaking into the gas outlet 11, while also ensuring sealing. That is, the cup member 32 allows gas generated on the igniter 50 side of the housing 10 to flow into the filter 41 side through a portion of the bottom portion 32b that is split by melting or breaking (a portion corresponding to one end of the hollow portion 41a). The crimping may be performed at any position as long as it corresponds to the circumferential surface of the cylindrical portion 32a of the cup member 32.

[0031] The filter 41 is a cylindrical member having a central hollow portion 41a (e.g., approximately cylindrical or rectangular). As described above, the filter 41 is installed in the housing 10 together with the cup member 32, and then the annular groove 41b is formed by the diameter reduction process. The use of the cylindrical filter 41 reduces the flow resistance of the working gas flowing during operation, enabling efficient gas flow. The filter 41 may be made of wire material made of metal such as stainless steel or steel, or a mesh material wound or compressed by pressing. Specifically, a knitted wire mesh, a plain weave wire mesh, or an assembly of crimped metal wire materials may be used. The filter 41 functions as a cooling means for cooling the gas generated in the housing 10 by removing the high-temperature heat of the gas as it passes through the filter 41, and also functions as a removal means for removing slag and other contaminants contained in the gas. Here, as a modification of the filter 41, a filter having a labyrinth flow path formed by combining roughly cylindrical or cone-shaped metal parts may be used. This allows the path of the working gas to be changed in various directions, thereby enabling cooling of the gas and removal of slag.

[0032] Furthermore, in the above-described embodiment of the present invention, a filter made of so-called knitted wire mesh is used as an example, but it is also possible to use a filter made by winding punched metal or expanded metal instead. Here, punched metal refers to a metal plate in which only openings are provided (i.e., no protrusions are provided around the edges of the openings), and expanded metal refers to a metal plate in which openings are provided in the plate metal member by, for example, making staggered cuts and then expanding the cuts to form a mesh-like structure. Even when such punched metal or expanded metal is used instead of the above-described knitted wire mesh, the same effects as those described in the above-described embodiment of the present invention can be obtained.

[0033] Furthermore, in the above-described perforated metal and expanded metal, the filter is formed as a laminate by winding a single metal plate-like member, but the configuration of the filter is not limited to this. That is, the filter may be formed as a laminate by combining different metal plate-like members each having different layers, or the filter may be formed as a laminate by combining a plurality of layers in which some layers are formed as a single metal plate-like member and the remaining layers are formed as a different single metal plate-like member.

[0034] Next, an operation of the gas generator 101 described above when activated will be described. When a vehicle equipped with an airbag device 100 incorporating gas generator 101 of the present embodiment collides, the collision is detected by collision detection means separately provided in the vehicle, and igniter 50 is activated based on this detection. When igniter 50 is activated, the pressure inside igniter 50 increases due to combustion of the ignition charge, causing the tip of squib cup 51 of igniter 50 to rupture, and flames flow from the tip of squib cup 51 of igniter 50 to the cup member 32 side inside housing 10.

[0035] The flame flowing in in this manner ignites and burns the gas generating agent 31 in the housing 10, generating a large amount of gas. This combustion of the gas generating agent 31 increases the pressure in the space 10A in the housing 10, and the generated gas melts or breaks and opens a portion of the bottom surface portion 32b of the cup member 32 corresponding to the hollow portion 41a, and flows into the hollow portion 41a. The generated gas then passes through the filter 41 and is ejected from the gas outlet 11 to the outside of the gas generator 101, but since it passes through the filter 41, the generated gas is cooled to a predetermined temperature. The gas ejected from the gas outlet 11 then passes through the inlet pipe 103 and flows into the airbag 105 from an inlet 103b between the inner wall of the inlet pipe 103 and the outer wall of the outside air introduction portion 104 (see arrow A in FIG. 3 which shows an image of the gas jet from the inlet 103b). At this time, the gas jet from the inlet 103b into the airbag 105 draws outside air into the airbag 105 via the outside air introduction section 104 (see the outline arrow B in FIG. 3 which shows an image of outside air being introduced at the outside air introduction section 104). That is, in addition to the gas supplied from the gas generator 101, outside air is forcibly drawn and supplied into the airbag 105, causing the airbag 105 to inflate and deploy as shown in FIG.

[0036] According to the present embodiment, it is possible to provide an airbag device 100 that is capable of deploying a relatively large-capacity airbag 105 by actively utilizing the working gas of the gas generator 101 to introduce outside air into the airbag 105, without increasing the output of the gas generator 101 in accordance with the size of the airbag 105. Furthermore, if the airbag 105 has a conventional capacity, it is also possible to provide an airbag device 100 with the same performance as the conventional one using a gas generator 101 with a smaller output than the conventional one.

[0037] Furthermore, since the support member 104c that connects and supports the inlet 103b and the interior opening 104b is installed, the balance of the space between the inlet 103b and the interior opening 104b can be maintained without being disturbed during activation. That is, when the outside air is drawn into the airbag 105 through the outside air introduction portion 104 by the gas jet from the inlet 103b, the outside air can be drawn in with the positions of each component kept stable. As a result, according to the airbag device 100, the outside air can be drawn in accurately during activation.

[0038] Furthermore, by providing the inflow pipe 103 inside the airbag 105, the airbag device 100 can be made smaller than when the inflow pipe 103 is provided outside the airbag 105. Furthermore, since the gas generator 101 is provided inside the airbag 105 from the top to the middle of the bottom, the airbag device 100 can be made smaller than when the gas generator 101 is provided outside the airbag 105.

[0039] Second Embodiment An airbag device 200 according to a second embodiment of the present invention will be described below with reference to Figures 5 to 8. Note that the airbag is not shown in Figure 5. Also, only a portion of the airbag is shown in Figure 6. Furthermore, unless otherwise specified, parts that have the same function as those in the first embodiment are designated by reference numerals with the same last two digits, and their description may be omitted.

[0040] The airbag device 200 of this embodiment differs from the first embodiment mainly in that (1) the gas generator 201 is a disk-shaped gas generator, which is a so-called disk-type gas generator, (2) although the functions are the same, the shapes of the inlet pipe 203 and the outside air introduction section 204 are different, and (3) two sets of the inlet pipe 203 and the outside air introduction section 204 are provided.

[0041] Gas generator 201 is a known disk-type gas generator comprising a housing 210 having a plurality of gas ejection holes 211 on its side which eject gas upon activation into airbag 205 and into opening 203a of inlet pipe 203, and is fixed to frame 207 together with airbag 205. Note that frame 207 is capable of being fixed to an object such as a vehicle. In addition, in Figure 6, the gas ejection holes 211 side of gas generator 201 is on the inside of airbag 205.

[0042] The outside air introduction section 204 is a tubular member that has an outside opening 204a located outside the airbag 205 and an inside opening 204b located inside the airbag 205, and that connects the inside and outside of the airbag 205. The outside air introduction section 204 also has at least one (two in this embodiment) support member 204c that connects and supports an inlet 203b (described later) and the inside opening 204b, installed around the inside opening 204b. As shown in FIG. 7, the support member 204c has at least one (three in this embodiment) hole 204d.

[0043] The inlet pipe 203 has a gas inlet 203b provided adjacent to the inner-side opening 204b at one end, and has an opening 203a on its side that faces one or more of the gas ejection holes 211 of the gas generator 201. The opening 203a communicates with the inlet 203b on the opening 203 side. The inlet 203b on the opening 203 side communicates with the inlet 203b on the opposite side to the opening 203 via a hole 204d (see FIG. 7) provided in the support member 204c. Note that the inlet 203b in this embodiment is an annular opening with a space between it and the inner-side opening 204b around the inner-side opening 204b, but is not limited to this. For example, the inlet 203b may have any configuration, including a tubular member having a diameter smaller than that of the outside air introduction section 204, as long as it has an outlet that can eject the gas supplied from the gas generator 201 adjacent to at least a portion of the inner opening 204b.

[0044] Next, an operation of the airbag device 200 described above when activated will be described. When a vehicle equipped with the airbag device 200 incorporating the gas generator 201 of this embodiment collides, the collision is detected by collision detection means separately provided in the vehicle, and the gas generator 201 generates activation gas. The generated gas is ejected from the gas outlet 211 to the outside of the gas generator 201, but also flows into the airbag 205 from the inlet 203b between the inner wall of the inlet pipe 203 and the outer wall of the outside air introduction section 204 via the opening 203a of the inlet pipe 203 (see arrows A1 (gas flow that does not pass through the hole 204d) and A2 (gas flow that passes through the hole 204d) in FIG. 8 which shows an image of the gas jet from the inlet 203b). At this time, the gas jet from the inlet 203b into the airbag 205 draws outside air into the airbag 205 via the outside air introduction section 204 (see the outline arrow B1 in FIG. 8 which shows an image of outside air being introduced at the outside air introduction section 204). That is, in addition to the gas supplied from the gas generator 201, outside air is forcibly drawn and supplied into the airbag 205, causing the airbag 205 to inflate and deploy.

[0045] According to this embodiment, the same effects as those of the first embodiment can be achieved.

[0046] Although the embodiments of the present invention have been described above with reference to the drawings, it should be understood that the specific configurations are not limited to these embodiments. The scope of the present invention is defined by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims.

[0047] For example, in the first embodiment, the method of reducing the diameter of the housing is explained by taking caulking as an example, but any processing method that can reduce the diameter of the housing may be used.

[0048] Furthermore, the outside air introduction section in each of the above embodiments may be provided with an on-off valve such as a check valve, if necessary.

[0049] In addition, in the second embodiment, two sets of the inlet pipe 203 and the outside air introduction section 204 are provided, but this is not limited to this. The number of sets of the inlet pipe 203 and the outside air introduction section 204 may be one, or three or more. [Explanation of symbols]

[0050] 10, 210 Housing 10A space 10a, 10b, 10e surrounding wall 11 Gas outlet 12 Closure member 13, 22, 32a1, 41b Annular groove 20 Holder 21, 23 Fitting part 24 Crimping part 31 Gas Generator 32 Cup member 32a Cylindrical part 32b Bottom part 35 coil spring 41 Filters 41a Hollow part 50 igniter 51 Squib Cup 52 terminal pins 53 Cylindrical member 60 Retainer 100, 200 Airbag device 101, 201 Gas Generator 102 Foundation 103, 203 Inflow pipe 103a, 203a opening 103b, 203b inlet 103d, 204d Hole 104, 204 Outside air intake 104a, 204a External opening 104b, 204b Internal opening 104c, 204c Support member 105, 205 airbags 106, 206 wiring 207 frames

Claims

1. Airbags and an outside air introduction section having an inside opening located inside the airbag and an outside opening located outside the airbag, the outside air introduction section communicating the inside and outside of the airbag; an inlet pipe having a gas inlet at one end provided adjacent to the interior opening; a gas generator provided on the other end side of the inflow pipe and configured to supply the gas from the other end side of the inflow pipe into the airbag through the inflow port when activated; Equipped with The airbag device is characterized in that the inlet is an annular opening around the outer periphery of the interior opening, with a space between the interior opening and the inlet.

2. 2. The airbag device according to claim 1, further comprising: at least one support member extending between the inlet and the interior opening, the support member connecting the inlet and the interior opening to support them.

3. 2. The airbag device according to claim 1, wherein the inlet pipe is provided inside the airbag.

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