Air bag module

Abstract

To provide a technique that causes a gas accommodated in a module before operation to enter an air bag, and expand the air bag with good efficiency by utilizing the gas during operation of a gas generator.SOLUTION: An air bag module comprises: an air bag with a gas introduction port; a module case which has a gas supply port connected to the gas introduction port of the air bag, and in which a storage space for storing an internal gas is formed; a gas generator which is attached to the module case, and supplies a gas generated during operation thereof into the storage space of the module case; and a pusher which is so located as be movable in the storage space by a pressure of the gas supplied from gas generator by operation thereof, pushes out the internal gas stored in the storage space before operation of the gas generator into the air bag by movement in association of the operation of the gas generator.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an airbag module. [Background technology]

[0002] In recent years, vehicles have been equipped with airbag devices (airbag modules) that deploy airbags to protect occupants in the event of a collision. Airbag devices for vehicles have been proposed to be installed on the steering wheel, on the sides of seats, near the window sides of the roof, etc.

[0003] Patent Document 1 proposes an airbag assembly including an airbag cushion, an inflator, and a plurality of high-velocity nozzles coupled to the inflator and configured to deliver inflation gas from the inflator to the airbag cushion. The housing of the airbag assembly includes an intake port configured to allow ambient air to be drawn into the airbag cushion during inflation of the airbag cushion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Patent No. 10,124,759 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-described airbag assembly, the gas ejected from the inflator enters the bag while drawing in surrounding air, but there is a problem in that the gas is not used efficiently when the inflator is activated.

[0006] The technology disclosed herein has been made in consideration of the above-mentioned circumstances, and its purpose is to provide a technology for efficiently deploying an airbag by utilizing gas generated when a gas generator is activated to introduce gas that has been stored in the module prior to activation into the airbag. [Means for solving the problem]

[0007] In order to solve the above problems, the technology of the present disclosure employs the following configuration. an airbag having a gas inlet; a module case having a gas supply port connected to the gas inlet of the airbag and an accommodation space for accommodating an internal gas formed therein; a gas generator attached to the module case and configured to supply gas generated when activated into the housing space of the module case; a pusher that is disposed in the accommodating space so as to be movable by the pressure of gas supplied from the gas generator upon activation of the gas generator, and that pushes out the internal gas that has been accommodated in the accommodating space before activation of the gas generator into the airbag by movement accompanying the activation of the gas generator; Equipped with.

[0008] The module case may have an air inlet hole for introducing air from outside the module case, and a check valve may be attached to the air inlet hole for preventing gas inside the module case from leaking to the outside.

[0009] The pusher is a moving body disposed on the tip side in the moving direction; an expandable cylinder, which is a bellows-shaped cylinder or a nested multi-cylinder body connected to the moving body and expands so as to extend in one direction by the gas generated from the gas generator; Equipped with The expansion cylinder may extend when the gas generator is activated, thereby moving the moving body from a start position to a terminal position within the accommodation space.

[0010] The outside air introduction hole may be formed closer to the start position than the end position in the module case.

[0011] The plunger may have a communication hole that connects the air passage in the expanding tube, to which gas is supplied from the gas generator, with the gas supply port of the module case, and the gas may be supplied to the gas supply port side of the module case through the communication hole.

[0012] The module case includes: a housing portion that defines the housing space and houses the plunger; a communication path that connects the accommodation space and the gas supply port and serves as a passage for gas supplied from the accommodation space; may include:

[0013] The module case includes: a housing portion that defines the housing space and houses the plunger; a communication path that connects the accommodation space and the gas supply port and serves as a passage for the internal gas accommodated in the accommodation space, the outside air introduced from the outside of the module case, and the gas supplied from the gas generator via an air passage in the expansion cylinder; may include:

[0014] In the airbag module, the gas generator is a pyrotechnic gas generator that generates the gas by burning at least a gas generating agent, The moving body is The cross-sectional shape in a cross section perpendicular to the movement direction is the same as the cross-sectional shape of the accommodation space in the same cross section, the movable body is fitted into the accommodating portion so that an outer peripheral surface of the movable body slides along an inner peripheral surface of the accommodating portion during movement; the accommodation space is divided into a first space closer to the communication path than the moving body and a second space closer to the gas generator than the moving body, The communication hole connecting the second space to the communication path may be closed to prevent communication between the second space and the communication path at least from the time the tip of the push rod starts to move due to activation of the gas generator until the tip reaches an intermediate position where the volume of the first space is smaller than the volume of the second space, and when the tip of the push rod passes the intermediate position, the communication hole may be opened to connect the second space to the communication path. [Effects of the Invention]

[0015] According to the present disclosure, a technology can be provided in which gas stored in the module prior to activation is introduced into the airbag by utilizing the gas generated when the gas generator is activated, thereby efficiently deploying the airbag. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic diagram of an airbag module according to a first embodiment. [Figure 2] FIG. 2 is a right side view of the airbag module. [Figure 3] FIG. 3 is a schematic cross-sectional view showing the airbag module in an activated state. [Figure 4] FIG. 4 is a diagram showing the airbag in a deployed state. [Figure 5] FIG. 5 is a schematic diagram of an airbag module according to the second embodiment. [Figure 6] FIG. 6 is a schematic diagram of an airbag module according to the third embodiment. [Figure 7] FIG. 7 is a schematic diagram showing the configuration of an airbag module according to the fourth embodiment in a state before activation. [Figure 8] FIG. 8 is a schematic diagram showing the configuration of the airbag module according to the fourth embodiment in an activated state. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, a gas generator according to an embodiment of the present disclosure will be described with reference to the drawings. Note that each configuration and combination thereof in each embodiment is an example, and addition, omission, substitution, and other modifications of configurations are possible as appropriate within the scope of the gist of the present invention. The present invention is not limited to the embodiments, but is limited only by the claims.

[0018] First Embodiment FIG. 1 is a schematic diagram of an airbag module 1 according to this embodiment. The airbag module 1 is installed, for example, inside a vehicle and deploys an airbag 20 to protect an occupant during a vehicle collision. However, the airbag module 1 may also be installed outside the vehicle (for example, around the hood) or inside the hood to protect a pedestrian. The airbag module 1 may also be installed on a bicycle, a motorcycle, or a recreational vehicle (such as a roller coaster or a go-kart), or on the driver or passenger thereof. Furthermore, the airbag module 1 may be installed on a pedestrian. FIG. 1 shows an example of a passenger airbag device mounted on the dashboard of a vehicle. FIG. 1 also shows a state before the airbag 20 is deployed, i.e., before the airbag module 1 is activated due to a collision or the like.

[0019] Fig. 2 is a right side view of the airbag module 1, Fig. 3 is a schematic cross-sectional view showing the state of the airbag module 1 when activated, and Fig. 4 is a view showing the state in which the airbag is deployed. In Figs. 1 to 4, the up-down direction is shown as the Y direction, the left-right direction as the X direction, and the front-rear direction as the Z direction. These directions are shown as examples for the convenience of explanation, and the configuration of the airbag module 1 is not limited to these. For example, the direction in which the airbag module 1 is arranged is not limited to the direction shown in the figure. The same applies to the subsequent drawings.

[0020] The airbag module 1 is embedded in the dashboard located in front of the passenger seat. The airbag module 1 includes a gas generator 10 that generates gas when activated, an airbag 20 that deploys upon receiving the gas, a module case 30, and a plunger 40.

[0021] The module case 30 includes a base 31 that holds the gas generator 10, the airbag 20, and the plunger 40, and a cover member 32 that is attached to the vehicle interior side (occupant side) of the base 31. The base 31 has a gas supply port 311 connected to the gas inlet 21 of the airbag 20, and an accommodation space 312 that communicates with the gas supply port 311 and accommodates the internal gas is formed inside. The space between the gas inlet 21 and the gas supply port 311 may be covered with a rupturable blocking member, a perforated plate, or the like before activation.

[0022] The module case 30 defines an accommodation space 312, has an accommodation portion 313 for accommodating the plunger 40, and connects the accommodation space 312 to a gas supply port 311. Module case 30 has communication path 33 which serves as a passage for the internal gas contained in storage space 312, the outside air introduced from outside the module case, and the gas supplied from gas generator 10. Storage section 313 has a cylindrical peripheral wall 315 which surrounds storage space 312, and has right side wall 316 at one end and left side wall 317 at the other end. Right side wall 316 is formed with a gas introduction hole 318.

[0023] Furthermore, module case 30 has, in right side wall 316, outside air inlet hole 319 for introducing outside air from outside the module case, and outside air inlet hole 319 is fitted with check valve 314 for preventing gas within the module case from leaking to the outside. Check valve 314 is, for example, a swing-type chuck valve whose valve element swings inwardly into module case 30. In this case, when the inside of module case 30 is at negative pressure, outside air is allowed to pass into the module case, and when the inside is at positive pressure, the valve element closes to prevent gas within the module case from leaking to the outside. Note that the gas within the module case includes gas present within the module case before activation, as well as outside air introduced through outside air inlet hole 319 during activation and gas supplied from gas generator 10.

[0024] Pusher 40 includes movable body 41 disposed at the tip end in the direction of movement, and expanding tube 42 connected to movable body 41. Expanding tube 42 is a nested multi-cylinder body, and the end opposite to movable body 41 is connected to gas introduction hole 318 in right side wall 316, and expands so as to extend in one direction when generated gas from gas generator 10 is supplied into the expanding tube. In this way, expanding tube 42 extends when gas generator 10 is activated, and pusher 40 moves movable body 41 from start position 41A to end position 41B within the accommodation space. Note that in the present embodiment, expanding tube 42 is a nested multi-cylinder body, but the invention is not limited to this, and expanding tube 42 may be a bellows-shaped cylinder that expands when supplied with gas from gas generator 10.

[0025] The cross-sectional shape of the movable body 41 in a cross section perpendicular to the movement direction (X direction) is approximately the same as the cross-sectional shape of the accommodation space 312 in the same cross section. In other words, the shape of the movable body 41 is such that it fits exactly inside the accommodation portion. Note that the cross-sectional shape of the movable body 41 and the cross-sectional shape of the accommodation space 312 do not need to be exactly the same, and the movable body 41 may be smaller than the accommodation space 312, so that the movable body 41 is a clearance fit. Furthermore, if the movable body 41 has elasticity and is fitted into the accommodation portion in a compressed state, the movable body 41 before compression may be formed larger than the accommodation space.

[0026] The movable body 41 is fitted into the accommodating section 313 so that its outer peripheral surface slides along the inner peripheral surface of the accommodating section 313 when it moves, dividing the accommodating space 312 into a first space 411 on the communication path side of the movable body 41 and a second space 412 on the gas generator side of the movable body 41.

[0027] The inner space of the extension tube 42 serves as an air passage 421 for gas supplied from the gas generator 10, and a communication hole 422 is provided near the tip of the extension tube 42 (near the moving body 41 when the extension tube 42 is in an extended state) to connect the air passage 421 to the connecting passage 33.

[0028] The cover member 32 is attached to the base 31 so as to cover the airbag 20 held by the base 31. In other words, by attaching the cover member 32 to the base 31, a storage space 32A is formed inside the module case 30 formed by the base 31 and the cover member 32, and the airbag 20 is stored in this storage space 32A. The cover member 32 is made of synthetic resin or the like, and is provided with a tear line at a predetermined position that is formed to be weaker than other portions.

[0029] Gas generator 10 is, for example, a pyrotechnic gas generator that generates gas by burning a gas generating agent. Gas generator 10 of the present embodiment may be one that generates at least combustion gas, and may be a hybrid gas generator that uses combustion gas and compressed air. However, it is not limited to this, and may also be a type that releases compressed air without generating combustion gas.

[0030] Gas generator 10 is connected to control unit 50 and operates under the control of control unit 50. For example, when an operating current (ignition current) is supplied from control unit 50, gunpowder in the gas generator is ignited, and combustion gas is generated by the combustion of the gunpowder. As a result, combustion gas is introduced from gas discharge hole 11 of gas generator 10 into gas introduction hole 318 of module case 30.

[0031] The airbag 20 is housed in a folded state inside the module case. When the airbag 20 receives gas from the gas generator 10, it inflates, rupturing the cover member 32 of the module case 30 and deploying to the front side of the airbag module 1.

[0032] The control unit 50 is connected to a sensor 60, which detects the state of the vehicle or the state of the surroundings of the vehicle. Based on the detection results, the control unit 50 determines whether or not to activate the airbag module 1, and if so, supplies an ignition current to the airbag module 1.

[0033] The sensor 60 is, for example, an impact sensor for detecting a vehicle collision. The sensor 60 is not limited to a sensor for detecting an impact, but may also be a sensor for detecting information about the surroundings of the vehicle in order to predict a collision with the vehicle. For example, the sensor 60 may include sensing means such as an acceleration sensor, a gyro sensor (angular velocity sensor), a positioning device, a camera, a radar, a LIDAR (Light Detection and Ranging, Laser Imaging Detection and Ranging), or a three-dimensional scanner. The positioning device may be, for example, a GPS (Global Positioning System) or the like. Examples of such sensors include a satellite positioning system. Radar and LIDAR determine the distance to objects around the vehicle and the moving speed of the objects. When the airbag module 1 is mounted on an object other than a vehicle, such as a person or a bicycle, the sensor 60 detects the state of the object, such as a person or a bicycle.

[0034] The control unit 50 acquires the detection result from the sensor 60, and when the detection result satisfies a predetermined condition, supplies an ignition current to the gas generator 10, activates the gas generator 10, and starts supplying combustion gas. The gas supplied from the gas generator 10 is introduced into the expanding tube through the gas inlet 318. Here, as shown in FIG. 1 , in the expanding tube 42 before deployment, the individual tubes overlap each other, and the communication hole 422 is blocked by the tube located on the outside. When the internal pressure of the air passage 421 increases with the introduction of the combustion gas, the expanding tube 42 expands, and the moving body 41 is moved from the start position 41A to the end position 41B. When the moving body 41 moves in this manner, the internal gas contained in the first space 411 on the communication passage 33 side of the start position 41A is pushed out by the moving body 41 into the communication passage 33 and supplied into the airbag 20 through the gas supply port 311. In addition, an outside air introduction hole 319 is formed closer to the starting position 41A than the terminal position 41B of the module case 30 (in this embodiment, the right side wall 316). When the moving body 41 moves, the second space 412 expands and becomes negative pressure, and outside air is introduced through the outside air introduction hole 319.

[0035] 3, when the plunger 40 is extended, the communication hole 422 provided near the tip of the extension tube 42 opens, and the combustion gas ejected from the communication hole 422 is supplied to the communication path 33. At this time, the combustion gas ejected from the communication hole 422 entrains the outside air introduced into the second space 412 and is supplied to the communication path 33. Therefore, the outside air is supplied to the airbag 20 together with the combustion gas through the communication path 33, causing the airbag 20 to deploy and the airbag module 1 to operate.

[0036] As described above, in this embodiment, not only the gas supplied from the gas generator 10 but also the internal gas contained in the module case before activation and the outside air introduced from the outside air inlet hole 319 are supplied to the airbag 20, allowing the airbag 20 to be deployed efficiently.

[0037] A device that generally draws in air along with gas from a gas generator to inflate an airbag. In this case, not only is a gas closer to the atmospheric components supplied to the airbag, but the amount of gas supplied from the gas generator can be reduced, thereby realizing a smaller and lighter gas generator. However, the airbag module of this embodiment is also effective in terms of thermal effects. That is, in the airbag module 1 of this embodiment, the internal gas contained in the module case is first supplied to the airbag 20 before activation, so damage to the airbag 20 due to the heat of the combustion gas is prevented even when a pyrotechnic gas generator 10 is used. Furthermore, in the airbag module 1 of this embodiment, the combustion gas is supplied while incorporating outside air, so the temperature of the combustion gas is lowered, preventing damage to the airbag 20 due to the heat of the combustion gas and improving reliability.

[0038] Furthermore, in the airbag module 1 of the present embodiment, the communication hole 422 is closed when the moving body 41 is located at the start position 41A, and the communication hole 422 is opened after the moving body 41 moves toward the terminal position 41B, thereby connecting the second space 412 and the communication path 33. This allows outside air to be introduced appropriately. Note that the communication between the second space 412 and the communication path 33 does not necessarily occur when the moving body 41 reaches the terminal position 41B. A configuration may be adopted in which the communication between the second space 412 and the communication path 33 is not established at least from the time the moving body 41 starts moving due to the activation of the gas generator 10 until the moving body 41 reaches an intermediate position where the volume of the first space 411 is smaller than the volume of the second space 412, and the communication is established when the moving body 41 passes the intermediate position. Alternatively, a cover such as sealing tape or a sheet material may be provided to close the communication hole 422, and the cover may be removed at a predetermined timing by the heat or pressure of the combustion gas, opening the communication hole 422 and connecting the air passage 421 and the communication path 33.

[0039] Second Embodiment 5 is a schematic diagram of an airbag module 1A according to a second embodiment. This embodiment differs from the previous embodiment in that the communication holes are formed in a nozzle shape, but the other configurations are the same. Therefore, the same elements are given the same reference numerals and will not be described again.

[0040] As shown in FIG. 5 , in this embodiment, an upward-facing nozzle 423 is provided near the tip of the spreading tube 42, and a tip opening 424 of the nozzle 423 communicates with the air passage 421 inside the spreading tube 42. In this embodiment, the tip opening 424 of the nozzle 423 functions as a communication hole. Note that the tip of the nozzle 423 comes into contact with the inner circumferential surface of the storage section 313 when the tip is closer to the start position than the terminal position 41B, thereby closing the tip opening 424. When the movable body 41 moves to the terminal position 41B and the nozzle 423 reaches the opening 31A on the storage section side of the communication passage 33, the tip opening 424 opens, and the air passage 421 and the communication passage 33 communicate with each other. In addition, a configuration can be adopted in which the tip opening 424 is closed with a blocking member, and when the tip of the nozzle 423 is closer to the start position than the terminal position 41B, the inner circumferential surface of the storage section 313 prevents the blocking member from tearing open. In this manner, in this embodiment, the tip opening 424 of the nozzle 423 is disposed close to the communication passage 33, and combustion gas can be efficiently supplied to the communication passage 33. Also, in this embodiment, the tip opening 424 of the nozzle 423 is closed when it comes into contact with the inner surface of the storage section, and is opened when it reaches the opening 31A of the communication passage 33, so that the ventilation passage 421 and the communication passage 33 communicate with each other at the appropriate time, and outside air can be efficiently introduced.

[0041] Third Embodiment 6 is a schematic diagram of an airbag module 1B according to a third embodiment. This embodiment differs from the second embodiment in that the communication holes are formed on the side of the vehicle, but the other configurations are the same. Therefore, the same elements are denoted by the same reference numerals, and a repeated description will be omitted.

[0042] As shown in Fig. 6, in this embodiment, a communication hole 414 is provided on the upper surface of the moving body 41, and the communication hole 414 communicates with the ventilation path 421 inside the expanding tube 42. The communication hole 414 is closed by contacting with the inner circumferential surface of the storage section 313 on the start position side of the terminal position 41B. When the movable body 41 moves to the terminal position 41B and the communication hole 414 reaches the opening 31A of the communication path 33 on the housing side, the communication hole 414 opens, and the ventilation path 421 and the communication path 33 communicate with each other. In this manner, in this embodiment, the communication hole 414 is disposed close to the communication path 33, and the combustion gas can be efficiently supplied to the communication path 33 side. Also, in this embodiment, the communication hole 414 is closed by contact with the inner surface of the housing and opens when it reaches the opening 31A of the communication path 33, so that the ventilation path 421 and the communication path 33 communicate with each other at the appropriate time, and outside air can be efficiently introduced.

[0043] <Fourth embodiment> Fig. 7 is a schematic diagram showing the airbag module 1C according to the fourth embodiment in a state before activation, and Fig. 8 is a schematic diagram showing the airbag module 1C according to the fourth embodiment in an activated state. This embodiment differs from the third embodiment in that the expanding tube 42 is omitted, but the other configurations are the same. For this reason, the same elements are designated by the same reference numerals, and repeated explanations will be omitted.

[0044] 7, in this embodiment, the plunger 40 does not include the extension tube 42, and a communication hole 414 is provided on the upper surface of the movable body 41, which communicates with the second space 412. Also, an outside air introduction path 39 connected to the outside air introduction hole 319 is formed in the second space 412, and a choke portion 391 is provided at the tip of the outside air introduction path 39, and an opening 392 narrowed by the choke portion 391 is disposed facing the combustion gas path. The opening 392 is formed by extending a cylinder separating the outside air introduction path 39 from the second space 412 from the right side wall 316 toward the choke portion 391, between the tip of the opening 392 and the choke portion 391.

[0045] When combustion gas is supplied from gas generator 10 via gas introduction hole 318 and the pressure in second space 412 increases, moving body 41 moves from start position 41A toward terminal position 41B, as shown in FIG. 8 . Note that communication hole 414 is closed by coming into contact with the inner circumferential surface of housing portion 313 on the start position side of terminal position 41B. When moving body 41 moves to terminal position 41B and reaches opening 31A on the housing side of communication path 33, communication hole 414 is opened, and air passage 421 and communication path 33 communicate with each other. Furthermore, when combustion gas is supplied from gas generator 10, outside air is sucked through opening 392 of choke portion 391 and introduced into second space 412. As a result, the outside air is supplied to airbag 20 through communication path 33 together with the combustion gas, and airbag 20 can be efficiently deployed despite a simple configuration that does not include expansion tube 42.

[0046] <Other> Although the preferred embodiments of the present disclosure have been described above, each aspect disclosed in this specification can be combined with any other feature disclosed in this specification. [Explanation of symbols]

[0047] 1, 1A, 1B, 1C: Airbag module 10: Gas generator 11: Gas exhaust hole 20: Airbag 21: Gas inlet 30: Module case 31: Base 31A:Aperture 32: Cover member 32A: Storage space 33: Access road 39: Fresh air intake 40: Pusher 41: Mobile 41A:Start position 41B: End position 42: Expansion tube 50: Control unit 60: Sensor 311: Gas supply port 312: Containment space 313: Storage unit 314: Check valve 315: Peripheral wall 316: Right side wall 317: Left side wall 318: Gas inlet 319: Outside air intake 391: Choke section 392 :Aperture 411: First space 412:Second space 414:Communication hole 421: Ventilation channel 422:Communication hole 423: Nozzle 424: Tip opening

Claims

1. an airbag having a gas inlet; a module case having a gas supply port connected to the gas inlet of the airbag and an accommodation space for accommodating an internal gas formed therein; a gas generator attached to the module case and configured to supply gas generated when activated into the housing space of the module case; a pusher that is disposed in the accommodating space so as to be movable by the pressure of gas supplied from the gas generator upon activation of the gas generator, and that pushes out the internal gas that has been accommodated in the accommodating space before activation of the gas generator into the airbag by movement accompanying the activation of the gas generator; An airbag module comprising:

2. 2. The airbag module according to claim 1, wherein the module case has an outside air inlet hole for introducing outside air from outside the module case, and the outside air inlet hole is fitted with a check valve for preventing gas within the module case from leaking to the outside.

3. The pusher is a moving body disposed on the tip side in the moving direction; an expandable cylinder, which is a bellows-shaped cylinder or a nested multi-cylinder body connected to the moving body and expands so as to extend in one direction by the gas generated from the gas generator; Equipped with 3. The airbag module according to claim 1, wherein the expandable cylinder extends when the gas generator is activated, thereby moving the moving body from a start position to a terminal position within the accommodation space.

4. 4. The airbag module according to claim 3, wherein the outside air introduction hole is formed closer to the start position than the end position in the module case.

5. 4. The airbag module according to claim 3, wherein the plunger has a communication hole that communicates an air passage in the expanding cylinder to which gas is supplied from the gas generator with the gas supply port of the module case, and the gas is supplied to the gas supply port side of the module case through the communication hole.

6. The module case includes: a housing portion that defines the housing space and houses the plunger; a communication path that connects the accommodation space and the gas supply port and serves as a passage for gas supplied from the accommodation space; 4. The airbag module of claim 3, comprising:

7. The module case includes: a housing portion that defines the housing space and houses the plunger; a communication path that connects the accommodation space and the gas supply port and serves as a passage for the internal gas accommodated in the accommodation space, the outside air introduced from the outside of the module case, and the gas supplied from the gas generator via an air passage in the expansion cylinder; 4. The airbag module of claim 3, which recites claim 2, including:

8. the gas generator is a pyrotechnic gas generator that generates the gas by burning at least a gas generating agent, The moving body is The cross-sectional shape in a cross section perpendicular to the moving direction is the same as the cross-sectional shape of the accommodation space in the same cross section. It is the same, When the movable body moves, the movable body is fitted into the housing portion so that the outer peripheral surface thereof slides along the inner peripheral surface of the housing portion, the accommodation space is divided into a first space closer to the communication path than the moving body and a second space closer to the gas generator than the moving body, 8. The airbag module according to claim 7, wherein a communication hole that communicates the second space with the communication path is closed to prevent communication between the second space and the communication path at least from the time when the tip of the pusher starts to move due to activation of the gas generator until the tip reaches an intermediate position where the volume of the first space is smaller than the volume of the second space, and when the tip of the pusher passes the intermediate position, the communication hole is opened to allow communication between the second space and the communication path.

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