Airbag module

Abstract

An airbag module includes: an airbag having a gas inlet; a module case having a gas supply port connected to the gas inlet of the airbag, and having an accommodation space in which an internal gas is accommodated; a gas generator assembled to the module case, and supplying a gas generated at the time of operation to the accommodation space of the module case; and a push member configured to be movable in the accommodation space by a pressure of the gas supplied from the gas generator by the operation of the gas generator, the push member pushing the internal gas accommodated in the accommodation space before the operation of the gas generator to the airbag by movement accompanying the operation of the gas generator.

Description

Technical Field

[0001] This invention relates to an airbag module. Background Technology

[0002] In recent years, vehicles have been equipped with airbag systems (airbag modules) that deploy airbags to protect occupants during a collision. For vehicle airbag systems, designs have been proposed that place airbags near the steering wheel, the sides of the seats, and the sides of the windows in the roof.

[0003] Patent document 1 discloses an airbag assembly comprising: an airbag pad; an inflator; and a plurality of high-speed nozzles, which, in conjunction with the inflator, are configured to deliver inflatable gas from the inflator to the airbag pad. The outer shell of the airbag assembly has an intake port configured to draw in ambient air into the airbag pad during its inflation.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: US Patent No. 10,124,759 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In the aforementioned airbag assembly, gas ejected from the inflator draws in surrounding air as it enters the bag, but there is a problem that the gas is not used efficiently when the inflator is working.

[0009] The technology disclosed herein was made in view of the above-mentioned actual situation, and its purpose is to provide a technology that uses the gas generated during the operation of a gas generator to allow gas contained in the module before operation to enter the airbag and thus efficiently deploy the airbag.

[0010] Solution for solving the problem

[0011] To solve the above problems, the technology disclosed herein employs the following configuration. Specifically, the airbag module of this disclosure comprises:

[0012] An airbag with an air inlet;

[0013] The module housing has a gas supply port connected to the gas inlet of the airbag, and has an internal space for accommodating the internal gas.

[0014] A gas generator, assembled in the module housing, supplies the gas generated during operation to the accommodating space of the module housing; and

[0015] A pusher is configured to move within the containment space using the pressure of gas supplied from the gas generator by the operation of the gas generator, the pusher pushing the internal gas contained in the containment space before the gas generator operates into the airbag by moving in accompaniment to the operation of the gas generator.

[0016] Alternatively, the module housing may have an external air inlet for introducing external air from outside the module housing, and a check valve is fitted in the external air inlet to prevent gas from flowing out of the module housing.

[0017] Alternatively, the pushing member may include:

[0018] A movable body, positioned at its top end in the direction of movement; and

[0019] An extension tube, which is a corrugated cylindrical body or nested multi-cylinder body connected to the moving body, extends in one direction by gas generated from the gas generator.

[0020] When the gas generator is in operation, the extension tube extends, thereby moving the moving body from the starting position to the ending position within the receiving space.

[0021] Alternatively, the external air inlet hole may be formed on the module housing at a position closer to the starting position than the terminal position.

[0022] Alternatively, the pusher may have a communication hole that connects the ventilation passage inside the extension tube from which gas is supplied from the gas generator to the gas supply port of the module housing, through which the gas is supplied to the gas supply port side of the module housing.

[0023] Alternatively, the module housing may include:

[0024] The receiving section divides the receiving space to accommodate the pushing member; and

[0025] A connecting path is provided to connect the containing space to the gas supply port, forming a passage for gas to be supplied from the containing space.

[0026] Alternatively, the module housing may include:

[0027] The receiving section divides the receiving space to accommodate the pushing member; and

[0028] The connecting passage connects the containing space to the gas supply port, forming a passage for the internal gas contained in the containing space, the external air introduced from outside the module housing, and the gas supplied from the gas generator via the ventilation passage in the extension tube.

[0029] Alternatively, in the airbag module,

[0030] The gas generator is a pyrotechnic gas generator that produces the gas by at least burning a gas generating agent.

[0031] The cross-sectional shape of the movable body on a plane orthogonal to the direction of movement is the same as the cross-sectional shape of the accommodating space on that plane.

[0032] When the movable body moves, it is inserted into the receiving part by sliding its outer peripheral surface along the inner peripheral surface of the receiving part.

[0033] The accommodating space is divided into a first space located on the side of the connecting road closer to the moving body and a second space located on the side of the gas generator closer to the moving body.

[0034] At least after the top of the pusher begins to move due to the operation of the gas generator and before it reaches the middle position where the volume of the first space becomes smaller than the volume of the second space, the connecting hole that connects the second space to the connecting road is closed, so that the second space is not connected to the connecting road. When the top of the pusher exceeds the middle position, the connecting hole is opened, so that the second space is connected to the connecting road.

[0035] Invention Effects

[0036] According to this disclosure, a technology can be provided to efficiently deploy an airbag by using gas generated during the operation of a gas generator to allow gas contained in the module before operation to enter the airbag. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the airbag module according to the first embodiment.

[0038] Figure 2 This is the right view of the airbag module.

[0039] Figure 3 This is a schematic cross-sectional view showing the state of the airbag module when it is working.

[0040] Figure 4 This is a diagram showing the state of the airbag deployment.

[0041] Figure 5 This is a schematic diagram of the airbag module according to the second embodiment.

[0042] Figure 6 This is a schematic diagram of the airbag module according to the third embodiment.

[0043] Figure 7 This is a schematic diagram showing the state of the airbag module before it is put into operation according to the fourth embodiment.

[0044] Figure 8 This is a schematic diagram showing the state of the airbag module in operation according to the fourth embodiment. Detailed Implementation

[0045] Hereinafter, a gas generator according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. It should be noted that the various components and combinations thereof in each embodiment are merely examples, and appropriate additions, omissions, substitutions, and other modifications to the configuration can be made without departing from the spirit of the invention. The present invention is not limited by the embodiments, but only by the claims.

[0046] <First Implementation Method>

[0047] Figure 1 This is a schematic diagram of the airbag module 1 according to this embodiment. The airbag module 1 is installed, for example, inside a vehicle, and deploys the airbag 20 to protect occupants during a vehicle collision. However, it is not limited to this; the airbag module 1 can also be installed on the outside of the vehicle (e.g., around the hood) or inside the hood to protect pedestrians. Furthermore, the airbag module 1 can also be installed on bicycles, motorcycles, amusement rides (roller coasters, go-karts, etc.) or their drivers and passengers. Moreover, the airbag module 1 can also be worn by pedestrians. Figure 1 The image shows an example of a so-called passenger-side airbag device mounted on the vehicle's dashboard. Furthermore, in... Figure 1 The image shows the state of the airbag 20 before it deploys, that is, before the airbag module 1 operates due to a collision or other factors.

[0048] Figure 2 This is the right view of airbag module 1. Figure 3 This is a schematic cross-sectional view showing the state of airbag module 1 during operation. Figure 4 This is a diagram showing the deployment state of the airbag. In Figures 1-4 In this diagram, the up-down direction is represented by the Y-direction, the left-right direction by the X-direction, and the front-back direction by the Z-direction. These directions are shown as examples for illustrative purposes only and do not limit the configuration of the airbag module 1. For instance, the orientation in which the airbag module 1 is configured is not limited to the orientation shown in the diagram. The same applies to the following figures.

[0049] The airbag module 1 is embedded in the instrument panel located in front of the passenger seat. The airbag module 1 includes: a gas generator 10 that generates gas when in operation; an airbag 20 that deploys upon receiving the gas; a module housing 30; and a pusher 40.

[0050] The module housing 30 includes: a base 31 that holds the gas generator 10, the airbag 20, and the pusher 40; and a cover member 32, which is mounted on the passenger 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 internal accommodating space 312 that communicates with the gas supply port 311 and accommodates the internal gas is formed therein. Alternatively, the gas inlet 21 and the gas supply port 311 may be covered before operation by a ruptureable sealing member, a perforated plate, or the like.

[0051] The module housing 30 has a receiving portion 313 that divides the receiving space 312 and accommodates the pusher 40, and connects the receiving space 312 to the gas supply port 311. Furthermore, the module housing 30 has a connecting passage 33, which serves as a passage for internal gas contained within the receiving space 312, external air introduced from outside the module housing, and gas supplied from the gas generator 10. The receiving portion 313 has a cylindrical peripheral wall 315 surrounding the receiving space 312, and has a right side wall 316 at one end and a left side wall 317 at the other end. A gas inlet hole 318 is formed in the right side wall 316.

[0052] Furthermore, the module housing 30 has an external air inlet 319 on its right side wall 316 for introducing external air from outside the module housing. A check valve 314 is fitted into the external air inlet 319 to prevent gas from flowing out of the module housing. The check valve 314 is, for example, a swing-type check valve whose valve core swings inward toward the module housing 30. In this case, when there is a negative pressure inside the module housing 30, external air flows into the module housing; when there is a positive pressure inside, the valve core closes to prevent gas from flowing out of the module housing. It should be noted that the gas inside the module housing includes not only the gas already present in the module housing before operation, but also the external air introduced through the external air inlet 319 during operation and the gas supplied from the gas generator 10.

[0053] The pressing member 40 includes: a movable body 41 disposed at its top end in the direction of movement; and an extension cylinder 42 connected to the movable body 41. The extension cylinder 42 is a nested multi-cylinder, and its end opposite to the movable body 41 is connected to a gas inlet 318 on the right side wall 316. Gas generated by the gas generator 10 is supplied into the extension cylinder, and the extension cylinder 42 extends in one direction. In this way, the pressing member 40 moves the movable body 41 from the starting position 41A to the ending position 41B within the receiving space by extending the extension cylinder 42 when the gas generator 10 is operating. It should be noted that in this embodiment, the extension cylinder 42 is configured as a nested multi-cylinder, but it is not limited to this. The extension cylinder 42 may also be a corrugated cylinder that extends upon receiving gas from the gas generator 10.

[0054] The cross-sectional shape of the movable body 41 on a plane orthogonal to the moving direction (X direction) is approximately the same as the cross-sectional shape of the receiving space 312 on the same plane. That is, the movable body 41 is shaped to fit perfectly into the receiving portion. It should be noted that the cross-sectional shape of the movable body 41 and the cross-sectional shape of the receiving space 312 may not be strictly the same, and the movable body 41 may be smaller than the receiving space 312 with a clearance fit. Furthermore, when the movable body 41 is elastic and is embedded in the receiving portion in a compressed state, the movable body 41 before compression may also be formed to be larger than the receiving space.

[0055] When the moving body 41 moves, it slides along the inner peripheral surface of the receiving part 313 and is embedded into the receiving part, dividing the receiving space 312 into a first space 411 that is closer to the connecting road side than the moving body 41 and a second space 412 that is closer to the gas generator side than the moving body 41.

[0056] The inner space of the extension cylinder 42 becomes a ventilation passage 421 for the gas supplied from the gas generator 10. Near the top of the extension cylinder 42 (near the moving body 41 when the extension cylinder 42 is extended), a connecting hole 422 is provided to connect the ventilation passage 421 with the connecting passage 33.

[0057] The cover member 32 is assembled to the base 31 in such a way that it covers the airbag 20 held in the base 31. In other words, the cover member 32 is assembled to the base 31, thereby forming a receiving space 32A inside the module housing 30 formed by the base 31 and the cover member 32, and the airbag 20 is received in the receiving space 32A. The cover member 32 is formed of synthetic resin or the like, and has crack lines formed at specified locations that are more fragile than those formed in other parts.

[0058] The gas generator 10 is, for example, a pyrotechnic gas generator that produces gas by burning a gas generating agent. The gas generator 10 of this embodiment only needs to produce at least combustion gas, and it can also be a gas generator that uses a mixture of combustion gas and compressed air. Furthermore, it is not limited to this; it can also be a type that discharges compressed air without producing combustion gas.

[0059] The gas generator 10 is connected to the control unit 50 and operates under the control of the control unit 50. For example, when an operating current (ignition current) is supplied from the control unit 50, the gunpowder in the gas generator is ignited, and combustion gas is generated through the combustion of the gunpowder. As a result, the combustion gas is introduced from the gas discharge port 11 of the gas generator 10 into the gas inlet port 318 of the module housing 30.

[0060] The airbag 20 is housed within the module housing in a folded state. When the airbag 20 receives gas from the gas generator 10, it inflates, causing the cover member 32 of the module housing 30 to crack and unfold toward the front side of the airbag module 1.

[0061] The control unit 50 is connected to the sensor 60. The sensor 60 detects the state of the vehicle or the state of the vehicle's surroundings. Based on the detection result, the control unit 50 determines whether to activate the airbag module 1. If the airbag module 1 is activated, the control unit 50 supplies ignition current to the airbag module 1.

[0062] Sensor 60 is, for example, an impact sensor used to detect vehicle collisions. It should be noted that sensor 60 is not limited to an impact sensor; it can also be a sensor that detects information around the vehicle to predict collisions to the vehicle. For example, sensor 60 can also be a sensor including sensing units such as an accelerometer, a gyroscope (angular velocity sensor), a positioning device, a camera, radar, LIDAR (Light Detection and Ranging, Laser Imaging Detection and Ranging), and a 3D scanner. As a positioning device, examples include satellite positioning systems such as GPS (Global Positioning System). Radar and LIDAR determine the distance to objects existing around the vehicle and the speed of those objects. It should be noted that when the airbag module 1 is mounted on an object other than a vehicle, such as a person or bicycle, sensor 60 detects the state of that object.

[0063] The control unit 50 acquires the detection results from the sensor 60. If the detection results meet specified conditions, it supplies ignition current to the gas generator 10, causing the gas generator 10 to operate and initiating the supply of combustion gas. The gas supplied from the gas generator 10 is introduced into the extension cylinder through the gas inlet 318. Here, as... Figure 1 As shown, before unfolding, the cylinders of the extension cylinder 42 overlap, and the connecting hole 422 is blocked by the cylinder located on its outer side. Then, as the internal pressure of the ventilation passage 421 increases with the introduction of combustion gas, the extension cylinder 42 extends, and the moving body 41 moves from the starting position 41A to the terminal position 41B. When the moving body 41 moves in this way, the internal gas contained in the first space 411, which is closer to the connecting passage 33 than the starting position 41A, is pushed out by the moving body 41 towards the connecting passage 33 and supplied to the airbag 20 via the gas supply port 311. In addition, an external air inlet hole 319 is formed at a position on the module housing 30 closer to the starting position 41A than the terminal position 41B (in this embodiment, the right side wall 316). When the moving body 41 moves, the second space 412 expands and becomes negative pressure, and external air is introduced through the external air inlet hole 319.

[0064] And, as Figure 3 As shown, when the pusher 40 extends, the connecting hole 422 located near the top of the extension cylinder 42 opens, and combustion gas ejected from the connecting hole 422 is supplied to the connecting passage 33. At this time, the combustion gas ejected from the connecting hole 422 is supplied to the connecting passage 33 with external air introduced into the second space 412. Therefore, external air and combustion gas are supplied to the airbag 20 together through the connecting passage 33, causing the airbag 20 to deploy and the airbag module 1 to operate.

[0065] In this embodiment, not only is gas supplied from the gas generator 10 supplied to the airbag 20, but also internal gas contained in the module housing before operation and external air introduced from the external air inlet 319 are supplied to the airbag 20, enabling the airbag 20 to deploy efficiently.

[0066] Generally, in devices that inflate an airbag by drawing in air along with gas from a gas generator, in addition to supplying gas with a composition closer to that of the atmosphere to the airbag, the amount of gas supplied from the gas generator can be reduced, thereby enabling the gas generator to be miniaturized and lightweight. However, besides this, the airbag module of this embodiment is also effective from the viewpoint of thermal effects. That is, in the airbag module 1 of this embodiment, the internal gas contained in the module housing before operation is supplied to the airbag 20, so even when using a pyrotechnic gas generator 10, damage to the airbag 20 caused by the heat of the combustion gas is prevented. Moreover, in the airbag module 1 of this embodiment, the combustion gas is supplied with external air entrained, so the temperature of the combustion gas decreases, which suppresses damage to the airbag 20 caused by the heat of the combustion gas, thus improving reliability.

[0067] Furthermore, in the airbag module 1 of this embodiment, when the moving body 41 is in the starting position 41A, the connecting hole 422 is closed. After the moving body 41 moves towards the terminal position 41B, the connecting hole 422 is opened, and the second space 412 is connected to the connecting path 33. This allows for the appropriate introduction of external air. It should be noted that the connection between the second space 412 and the connecting path 33 is not limited to when the moving body 41 reaches the terminal position 41B. It can also be configured such that at least after the moving body 41 begins to move due to the operation of the gas generator 10 and before reaching the intermediate position where the volume of the first space 411 is smaller than the volume of the second space 412, the connection is established, and the connection is established when the moving body 41 exceeds the intermediate position. Alternatively, a cover such as a sealing strip or seal can be provided to block the connecting hole 422. Through the heat and pressure of the combustion gas, the cover detaches at a predetermined time, opening the connecting hole 422 and connecting the ventilation path 421 to the connecting path 33.

[0068] <Second Implementation Method>

[0069] Figure 5 This is a schematic diagram of the airbag module 1A according to the second embodiment. In this embodiment, the difference from the aforementioned embodiment is that the connecting hole is formed in the shape of a nozzle; all other components are the same. Therefore, the same reference numerals are used to label the same elements, and further description is omitted.

[0070] like Figure 5As shown, in this embodiment, an upward-facing nozzle 423 is provided near the top of the extension cylinder 42, and the top opening 424 of the nozzle 423 communicates with the ventilation passage 421 inside the extension cylinder 42. In this embodiment, the top opening 424 of the nozzle 423 functions as a communication hole. It should be noted that the top of the nozzle 423 is in contact with the inner peripheral surface of the receiving portion 313 at a position closer to the starting position than the terminal position 41B, thereby closing the top opening 424. Then, the moving body 41 moves towards the terminal position 41B, and when the nozzle 423 reaches the opening 31A on the receiving portion side in the connecting passage 33, the top opening 424 opens, and the ventilation passage 421 communicates with the connecting passage 33. Alternatively, it can be configured such that the top opening 424 is pre-closed by a blocking member, and when the top of the nozzle 423 is at a position closer to the starting position than the terminal position 41B, the blocking member is prevented from opening by the inner peripheral surface of the receiving portion 313. In this embodiment, the tip opening 424 of the nozzle 423 is positioned close to the connection passage 33, enabling efficient supply of combustion gases to the connection passage 33. Furthermore, in this embodiment, the tip opening 424 of the nozzle 423 is closed by contact with the inner surface of the receiving portion and opens when it reaches the opening 31A of the connection passage 33. Therefore, the vent passage 421 can be connected to the connection passage 33 at appropriate timing, allowing for efficient introduction of external air.

[0071] <Third Implementation Method>

[0072] Figure 6 This is a schematic diagram of the airbag module 1B according to the third embodiment. In this embodiment, the difference from the second embodiment described above is that a connecting hole is formed on the side of the movable body; otherwise, the configuration is the same. Therefore, the same reference numerals are used to label the same elements, and further description is omitted.

[0073] like Figure 6 As shown, in this embodiment, a connecting hole 414 is provided on the upper side of the moving body 41, so that the connecting hole 414 communicates with the ventilation passage 421 inside the extension cylinder 42. It should be noted that the connecting hole 414 is in contact with the inner peripheral surface of the receiving portion 313 at a position closer to the starting position than the terminal position 41B, and is thus closed. Then, the moving body 41 moves towards the terminal position 41B, and when the connecting hole 414 reaches the opening 31A on the receiving portion side of the connecting passage 33, the connecting hole 414 is opened, and the ventilation passage 421 communicates with the connecting passage 33. In this way, in this embodiment, the connecting hole 414 is arranged close to the connecting passage 33, which allows for efficient supply of combustion gas to the connecting passage 33 side. Furthermore, in this embodiment, the connecting hole 414 is closed by contact with the inner surface of the receiving portion and opens when it reaches the opening 31A of the connecting passage 33, thus allowing the ventilation passage 421 to communicate with the connecting passage 33 at appropriate timing, and enabling efficient introduction of external air.

[0074] <Fourth Implementation Method>

[0075] Figure 7 This is a schematic configuration diagram showing the state of the airbag module 1C before operation according to the fourth embodiment. Figure 8 This is a schematic configuration diagram showing the state of the airbag module 1C in operation according to the fourth embodiment. In this embodiment, the difference from the aforementioned third embodiment is that the extension tube 42 is omitted, while the other configurations are the same. Therefore, the same reference numerals are used to label the same elements, and further description is omitted.

[0076] like Figure 7 As shown, in this embodiment, the pusher 40 does not have an extension cylinder 42, and a connecting hole 414 is provided on the upper side of the moving body 41, so that the connecting hole 414 communicates with the second space 412. Furthermore, an external air inlet path 39 connected to the external air inlet hole 319 is formed within the second space 412, and a choke portion 391 is provided at the top end of the external air inlet path 39, with the opening 392, which is narrowed by the choke portion 391, positioned towards the path of the combustion gas. Regarding the opening 392, a cylindrical body separating the external air inlet path 39 and the second space 412 extends from the right side wall 316 toward the choke portion 391, forming the opening 392 between its top end and the choke portion 391.

[0077] When combustion gas is supplied from the gas generator 10 through the gas inlet 318 and the pressure in the second space 412 increases, such as Figure 8 As shown, the moving body 41 moves from the starting position 41A to the terminal position 41B. It should be noted that the connecting hole 414 is in contact with the inner circumferential surface of the receiving portion 313 at a position closer to the starting position than the terminal position 41B, thus being closed. Then, the moving body 41 moves towards the terminal position 41B, and when it reaches the opening 31A on the receiving portion side of the connecting passage 33, the connecting hole 414 is opened, and the ventilation passage 421 connects with the connecting passage 33. Furthermore, when combustion gas is supplied from the gas generator 10, external air is drawn in from the opening 392 of the choke portion 391 and introduced into the second space 412. Thus, external air and combustion gas are supplied to the airbag 20 together through the connecting passage 33, thereby enabling the airbag 20 to deploy efficiently while maintaining a simplified structure without the extension tube 42.

[0078] <Other>

[0079] The preferred embodiments of this disclosure have been described above, but the various solutions disclosed in this specification can also be combined with any other features disclosed in this specification.

[0080] Explanation of reference numerals in the attached figures

[0081] 1, 1A, 1B, 1C: Airbag modules;

[0082] 10: Gas generator;

[0083] 11: Gas vent hole;

[0084] 20: Airbag;

[0085] 21: Gas inlet;

[0086] 30: Module housing;

[0087] 31: Matrix;

[0088] 31A: Opening;

[0089] 32: Cover component;

[0090] 32A: Accommodation space;

[0091] 33: Connecting road;

[0092] 39: External air intake path;

[0093] 40: Push-out component;

[0094] 41: Moving body;

[0095] 41A: Starting position;

[0096] 41B: Terminal location;

[0097] 42: Extension tube;

[0098] 50: Control Department;

[0099] 60: Sensor;

[0100] 311: Gas supply port;

[0101] 312: Accommodation space;

[0102] 313: Reception area;

[0103] 314: Check valve;

[0104] 315: Zhou Bi;

[0105] 316: Right side wall;

[0106] 317: Left side wall;

[0107] 318: Gas inlet port;

[0108] 319: External air inlet port;

[0109] 391: Choke;

[0110] 392: Opening;

[0111] 411: First Space;

[0112] 412: Second Space;

[0113] 414: Connecting hole;

[0114] 421: Ventilation path;

[0115] 422: Connecting hole;

[0116] 423: Nozzle;

[0117] 424: Open at the top.

Claims

1. An airbag module, comprising: An airbag with an air inlet; The module housing has a gas supply port connected to the gas inlet of the airbag, and has an internal space for accommodating the internal gas. A gas generator, assembled in the module housing, supplies the gas generated during operation to the accommodating space of the module housing; as well as A pusher is configured to move within the containment space using the pressure of gas supplied from the gas generator by the operation of the gas generator, the pusher pushing the internal gas contained in the containment space before the gas generator operates into the airbag by moving in accompaniment to the operation of the gas generator.

2. The airbag module according to claim 1, wherein, The module housing has an external air inlet for introducing external air from outside the module housing, and a check valve is installed in the external air inlet to prevent gas inside the module housing from flowing out to the outside.

3. The airbag module according to claim 1 or 2, wherein, The pushing member includes: A movable body, disposed at its top end in the direction of movement; and An extension tube, which is a corrugated cylindrical body or nested multi-cylinder body connected to the moving body, extends in one direction by gas generated from the gas generator. When the gas generator is in operation, the extension tube extends, thereby moving the moving body from the starting position to the ending position within the receiving space.

4. The airbag module according to claim 3 of claim 2, wherein, The external air inlet is formed on the module housing at a position closer to the starting position than the terminal position.

5. The airbag module according to claim 3, wherein, The pusher has a communication hole that connects a ventilation passage inside the extension tube, from which gas is supplied by the gas generator, to the gas supply port of the module housing, through which the gas is supplied to the gas supply port side of the module housing.

6. The airbag module according to claim 3, wherein, The module housing includes: The receiving section divides the receiving space to accommodate the pushing member; and A connecting path is provided to connect the containing space to the gas supply port, forming a passage for gas to be supplied from the containing space.

7. The airbag module according to claim 3 of claim 2, wherein, The module housing includes: The receiving section divides the receiving space to accommodate the pushing member; and The connecting passage connects the containing space to the gas supply port, forming a passage for the internal gas contained in the containing space, the external air introduced from outside the module housing, and the gas supplied from the gas generator via the ventilation passage in the extension tube.

8. The airbag module according to claim 7, wherein, The gas generator is a pyrotechnic gas generator that produces the gas by at least burning a gas generating agent. The cross-sectional shape of the movable body on a plane orthogonal to the direction of movement is the same as the cross-sectional shape of the accommodating space on that plane. When the movable body moves, it is inserted into the receiving part by sliding its outer peripheral surface along the inner peripheral surface of the receiving part. The accommodating space is divided into a first space located on the side of the connecting road closer to the moving body and a second space located on the side of the gas generator closer to the moving body. At least after the top of the pusher begins to move due to the operation of the gas generator and before it reaches the middle position where the volume of the first space becomes smaller than the volume of the second space, the connecting hole that connects the second space to the connecting road is closed, so that the second space is not connected to the connecting road. When the top of the pusher exceeds the middle position, the connecting hole is opened, so that the second space is connected to the connecting road.

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