JP5079340B2 - Airbag device - Google Patents

Description

  The present invention relates to an airbag device for protecting an occupant.

An airbag device that restrains an occupant by deploying an airbag in a vehicle interior with gas supplied from an inflator at the time of a vehicle collision is provided with a vent hole to prevent an excessive increase in the internal pressure of the airbag, Some vent holes are opened during airbag deployment.
In addition, in the airbag device, in order to control the volume expansion and the internal pressure of the airbag, a breaking joint portion that breaks during the deployment is provided in advance in the airbag, and the volume of the airbag is gradually increased by breaking the breaking joint portion. There is something that expands.

For example, Patent Document 1 discloses that an end of a vent hole cover that closes a vent hole is joined to an airbag at a break joint, and the vent hole cover is removed from the vent hole when the break joint is broken when the airbag is deployed. An airbag device is described that disengages and opens the vent hole.
In this case, it is necessary to prevent the vent hole from being opened due to the position of the vent hole cover being shifted during the airbag deployment before the fracture joint is broken. In this regard, Patent Document 1 describes that a vent hole cover is sewn to an airbag in the vicinity of the vent hole.
Japanese Patent Laid-Open No. 2005-199987

However, the conventional vent hole cover positional deviation prevention technology has room for improvement because the number of sewing parts increases and productivity decreases.
In addition, it takes time to arrange the vent hole cover when manufacturing the airbag, and there is room for improvement.
Accordingly, the present invention provides an airbag device that can prevent the displacement of the vent hole cover that closes the vent hole and that improves productivity.

The airbag device according to the present invention employs the following means in order to solve the above problems.
The invention according to claim 1 is directed to an airbag (for example, an airbag 32 in an embodiment described later), an inflator opening (for example, an opening 37a in an embodiment described later), and a vent provided on a side of the inflator opening. An airbag apparatus including a hole (for example, a vent hole 37b in an embodiment described later) and a vent hole cover (for example, a vent hole cover 50 in an embodiment described later) for closing the vent hole, A belt-shaped blocking portion (for example, blocking portion 51 in the embodiment described later) disposed inside the airbag and covering the vent hole, and a longitudinal intermediate portion of the blocking portion (for example, intermediate portion 54 in the embodiment described later) ) Extending toward the inflator opening (for example, an extending portion in an embodiment described later) 5), and both ends of the closing portion (for example, end portions 52 and 53 in the embodiment described later) are broken joint portions (for example, a sewing portion 39 in the embodiment described later) that breaks when the airbag is deployed. The closed portion is joined to the airbag, and the intermediate portion in the longitudinal direction is formed wider than the vent hole to close the vent hole, and the end portion of the closed portion (for example, in an embodiment described later) The both end portions 52 and 53) are air bag devices characterized in that the width becomes narrower from the intermediate portion in the longitudinal direction toward the fracture joint portion .
With this configuration, the vent hole cover can be prevented from being displaced during manufacture and deployment of the airbag, and the vent hole is kept closed until the end of the vent hole cover is removed from the airbag. be able to. Further, the resistance when the vent hole cover comes out of the vent hole can be reduced.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, the extension portion covers the periphery of the opening of the inflator.
By comprising in this way, a vent hole cover can be easily set to an airbag at the time of manufacture of an airbag apparatus. Further, the extending portion functions as a reinforcing member that reinforces the airbag around the inflator opening.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the positioning means for positioning the vent hole cover with respect to the airbag at the time of joining both end portions of the closing portion and the airbag. (For example, positioning lines 60 and 61 in an embodiment described later) are provided.
By configuring in this way, the vent hole cover can be easily disposed at an appropriate position with respect to the airbag, and it can be easily confirmed that the vent hole cover is disposed at an appropriate position. And the vent hole cover can be securely polymerized to form a fracture joint.

The invention according to claim 4 is the invention according to claim 3, characterized in that the positioning means is configured by making the color of the airbag different from the color of the vent hole cover.
By comprising in this way, the position of the vent cover arrange | positioned inside an airbag can be grasped | ascertained appropriately.

According to a fifth aspect of the present invention, in the invention according to the third or fourth aspect, the positioning means is a mark (for example, implementation described later) provided at a portion of the airbag where the vent hole cover is disposed. It has a positioning line 60) in the example.
By comprising in this way, the relative position of an airbag and a vent hole cover can be adjusted appropriately.

According to a sixth aspect of the present invention, in the invention according to any one of the third to fifth aspects, the positioning means is a mark provided in the vicinity of an end of the vent hole cover (for example, an implementation described later). It has a positioning line 61) in the example.
By comprising in this way, the end part of a vent hole cover can be easily arrange | positioned in the position which the airbag desires.

The invention according to claim 7 is the invention according to any one of claims 1 to 6 , wherein an airbag cover for storing the airbag in a folded state (for example, a front cover 17 in an embodiment described later). , A rear cover 19), and the vent hole is formed at a position that does not interfere with a deployment locus 23 of the airbag cover (for example, in an embodiment described later) in the deployed state of the airbag. And
With this configuration, it is possible to prevent the vent hole from interfering with the deployed airbag cover when the airbag is deployed, and the exhaust from the vent hole can be performed smoothly and stably. The load characteristics of the airbag can be stabilized.

An invention according to an eighth aspect is the invention according to any one of the first to seventh aspects , wherein the vent hole is provided on a steering wheel of a vehicle (for example, a steering wheel 12 in an embodiment described later). In the deployed state of the airbag, the steering wheel is located on the inner side of the grip portion of the steering wheel (for example, a steering wheel main body 21 in an embodiment described later).
With this configuration, the vent hole can be prevented from interfering with the grip portion of the steering wheel when the airbag is deployed, and exhaust from the vent hole can be performed smoothly and stably. The load characteristics of the airbag can be stabilized.

According to the first aspect of the invention, the position of the vent hole cover does not shift during the manufacture and deployment of the airbag, and the closure of the vent hole can be maintained until the end of the vent hole cover is removed from the airbag. The air bag can be appropriately controlled for internal pressure and deployment. Further, the resistance when the vent hole cover comes out of the vent hole can be reduced.

According to the invention which concerns on Claim 2, since a vent hole cover can be easily set to an airbag at the time of manufacture of an airbag apparatus, productivity improves.
In addition, since the extending portion functions as a reinforcing member that reinforces the airbag around the inflator opening, the periphery of the inflator opening can be reinforced without increasing the number of parts.

According to the invention according to claim 3 , the vent hole cover can be easily disposed at an appropriate position with respect to the airbag, and it can be easily confirmed that the vent hole cover is disposed at an appropriate position. The airbag and the vent hole cover can be reliably polymerized to form a fracture joint, and gas can be stably discharged from the vent hole when the airbag is deployed.

According to the invention which concerns on Claim 4, the position of the vent cover arrange | positioned inside an airbag can be grasped | ascertained appropriately.
According to the invention which concerns on Claim 5, the relative position of an airbag and a vent hole cover can be adjusted appropriately.
According to the sixth aspect of the present invention , the end of the vent hole cover can be easily arranged at a desired position of the airbag.
According to the invention which concerns on Claim 7 and Claim 8, exhaust from a vent hole can be performed smoothly and stably, and the load characteristic of an airbag can be stabilized.

  Embodiments of an airbag apparatus according to the present invention will be described below with reference to the drawings of FIGS. In addition, the airbag apparatus of each Example described below is the aspect of the airbag apparatus accommodated in the handle | steering_wheel for the driver | operator of a vehicle, In the following description, "front and back" is the same as the front and rear in a vehicle body. .

As shown in FIG. 1, an airbag module 13 of an airbag device is accommodated in a steering wheel 12 disposed in front of a seat 11 of a driver seat.
As shown in FIG. 2, the steering wheel 12 has a boss portion 16 fixed to the rear end of the steering shaft 14 by a nut 15, and a cup-shaped front cover 17 is fixed to the boss portion 16. A rear cover 19 is fixed to the periphery of the front cover 17 by a plurality of bolts 18 so as to close the front cover 17. A plurality of spoke portions 20 extending radially are attached to the outer peripheral surface of the front cover 17, and a steering wheel main body (grip portion) 21 is supported by the spoke portions 20.

A retainer 22 is fastened together with bolts 18 on the inner peripheral surface of the rear cover 19, and the airbag module 13 is supported on the retainer 22. The front cover 17 and the rear cover 19 constitute an airbag cover that houses the airbag module 13.
A tear line 19a is formed on the inner surface of the rear cover 19 to promote breakage. As shown in FIG. 8, when the rear cover 19 is viewed from the front, the tear line 19a is formed in a substantially H shape, and the rear cover 19 is broken along the tear line 19a, and the upper side and the lower side in the figure. It will be divided and expanded.
The airbag module 13 includes an inflator 31 filled with a propellant that generates high-pressure gas by combustion, an airbag 32 that is configured by sewing a base cloth and inflates when high-pressure gas generated by the inflator 31 is introduced, A fixing ring 33 for fixing the base of the bag 32 is provided. The flange 31 a of the inflator 31 and the fixing ring 33 are superposed on the front surface and the rear surface of the retainer 22, and are fastened and fixed with a plurality of bolts 34 and nuts 35. The base portion of the airbag 32 is fixed between the rear surface of the retainer 22 and the front surface of the fixing ring 33.

As shown in FIG. 3, the circular airbag 32 includes a first base fabric 36 on the rear side (side facing the occupant) and a second base fabric 37 that is superposed on the front surface thereof. And the 2nd base fabric 37 is sewn integrally by the sewing part 38 on the outer peripheral part. Further, the overlapped first base cloth 36 and second base cloth 37 are sewn by a plurality of spiral sewing parts (break joints) 39 inside the sewing part 38. In this embodiment, there are three spiral sewing portions 39, but there may be two or four or more. The outer circumferential sewing portion 38 is firmly sewn with a thick thread so as not to break when the airbag 32 is inflated. It is fragilely sewn with fine thread.
The radially inner end 39a of the spiral sewing part 39 is directed to the center of the airbag 32, and stress is concentrated on the radially inner end 39a when the airbag 32 is deployed to promote the breakage of the sewing part 39. ing.

The second base fabric 37 has a circular opening (inflator opening) 37 a surrounding the inflator 31, through holes 37 c of a plurality of bolts 34 formed around the opening 37 a, and internal gas when the airbag 32 is inflated. A circular vent hole 37b that allows a part of it to escape is formed. The opening 37 a is disposed at the center of the second base cloth 37, and the vent hole 37 b is disposed at the side of the opening 37 a and is eccentric from the center of the second base cloth 37.
As described above, since the second base fabric 37 is sandwiched between the rear surface of the retainer 22 and the front surface of the fixing ring 33 and is tightened by a plurality of bolts 34, the gas generated by the inflator 31 is the second base fabric. The air is supplied to the inside of the airbag 32 from the central opening 37 a of the cloth 37.

The airbag 32 is provided with a vent hole cover 50 that controls its internal pressure.
As shown in FIGS. 3 and 4, the vent hole cover 50 has a substantially T-shape in plan view, and has a straight belt shape, and both end portions 52 and 53 are disposed on the outer peripheral portion of the airbag 32. And an extending portion 55 extending from the intermediate portion 54 in the longitudinal direction of the closing portion 51 toward the opening 37a.

  The intermediate part 54 of the closing part 51 is formed wider than the vent hole 37b so as to be able to close the vent hole 37b. The closing part 51 becomes narrower as it approaches the both end parts 52 and 53 from the intermediate part 54. It has become. The vent hole cover 50 is arranged along the inner surface of the second base fabric 37 at a position where the vent hole 37b can be closed by the intermediate portion 54. Both end portions 52 and 53 of the close portion 51 are arranged at the first base fabric 36. And it cuts in an arc shape in front of the sewing part 38 along the peripheral edge of the second base cloth 37, and is simultaneously sewn by three spiral sewing parts 39 that join the first base cloth 36 and the second base cloth 37 together. ing.

  The extending portion 55 is formed to have substantially the same width over the entire length thereof, and the distal end portion 56 of the extending portion 55 is disposed so as to cover the periphery of the opening 37 a of the second base fabric 37. The front end portion 56 has a hole 55a having the same diameter as the opening 37a and concentrically with the opening 37a, and a plurality of through holes formed around the hole 55a and corresponding to the through holes 37c of the second base cloth 37. A hole 55b is provided. The distal end portion 56 of the extending portion 55 is sandwiched between the rear surface of the retainer 22 and the front surface of the fixing ring 33 together with the second base fabric 37, and is fastened to the retainer 22 together with the second base fabric 37 with the bolts 34.

  The airbag 32 has a first base cloth 36 and an outer peripheral part of the second base cloth 37 joined together by a sewing part 38, and then a vent hole cover 50 is temporarily placed on the second base cloth 37, and further turned upside down. The inner side of the sewing part 38 is joined by the shaped sewing part 39, but the vent hole cover 50 is closed to the second base fabric 37 before turning over so that the vent hole cover 50 is not displaced when turning over. It may be temporarily fixed to the appropriate position.

In addition, both end portions 52 and 53 of the vent hole cover 50 are arranged at appropriate positions with respect to the second base cloth 37 before the sewing portion 39 is sewn, regardless of whether the vent hole cover 50 is temporarily fixed. Make sure. In order to facilitate this confirmation, it is preferable to use the following positioning means for the vent hole cover 50.
The first positioning means makes the color of the vent hole cover 50 darker than the colors of the first base fabric 36 and the second base fabric 37. That is, the colors of the first base cloth 36 and the second base cloth 37 are different from the color of the vent hole cover 50. If the color is changed in this way, the vent hole cover 50 disposed between the first base cloth 36 and the second base cloth 37 can be seen through the first base cloth 36 or the second base cloth 37. Therefore, it is possible to easily visually check whether or not both end portions 52 and 53 of the closing portion 51 of the vent hole cover 50 are correctly arranged at the position where the sewing portion 39 is formed. When the vent hole cover 50 is not disposed at an appropriate position, the position of the vent hole cover 50 can be easily adjusted to an appropriate position.

  As shown in FIG. 10, the second positioning means is for positioning at a position where the outer edge of the closed portion 51 of the vent hole cover 50 should be placed in advance on the surface of the second base fabric 37 on which the vent hole cover 50 is mounted. A line (mark) 60 is drawn by printing or the like. In this way, when the first base cloth 36 or the second base cloth 37 is seen through, the outer edge of the closed portion 51 of the vent hole cover 50 extends along the positioning line 60 of the second base cloth 37. If it is arranged, it can be easily visually confirmed that both ends 52 and 53 of the closing part 51 are correctly arranged at the position where the sewing part 39 is formed. When the vent hole cover 50 is not disposed at an appropriate position, the position of the vent hole cover 50 can be easily adjusted to an appropriate position. A mark such as a circle may be used instead of the positioning line 60.

As shown in FIG. 11, the third positioning means draws a positioning line (mark) 61 in advance by printing or the like at positions where the sewing portions 39 are formed at both end portions 52, 53 of the vent hole cover 50. deep. In this way, when the first base cloth 36 or the second base cloth 37 is seen through, the positioning line 61 of the closing part 51 of the vent hole cover 50 is arranged on the outer peripheral part of the second base cloth 37. By doing so, it can be easily visually confirmed that both end portions 52 and 53 of the closing portion 51 are correctly arranged at the positions where the sewing portions 39 are formed. When the vent hole cover 50 is not disposed at an appropriate position, the position of the vent hole cover 50 can be easily adjusted to an appropriate position. In place of the positioning line 61, a mark such as a circle may be used.
Further, the first positioning means, the second positioning means, and the third positioning means may be appropriately combined.

  If the positioning means for the vent hole cover 50 is provided in this way, both end portions 52 and 53 of the vent hole cover 50 can be easily disposed at appropriate positions with respect to the second base cloth 37, and appropriate Since it can be easily visually confirmed that it is disposed at the position, the first base fabric 36, the second base fabric 37, and the vent hole cover 50 can be securely overlapped and sewn to form the sewing portion 39. . As a result, the vent hole 37b can be properly closed by the vent hole cover 50, and the gas can be stably discharged from the vent hole 37b when the airbag 32 is deployed, as will be described later, thereby suppressing variation in performance. be able to.

  In the airbag device configured as described above, the inflator 31 is ignited when a gravitational acceleration of a predetermined value or more is detected at the time of a vehicle collision, and the folded airbag 32 starts to be inflated with the gas generated by the inflator 31. When the airbag 32 is inflated, the rear cover 19 is broken at the tear line 19a by receiving this pressure, and the airbag 32 is deployed into the vehicle compartment from the opening formed there.

  As shown in FIG. 6, when the airbag 32 is inflated, three spiral sewing portions 39 integrally join the first base fabric 36 and the second base fabric 37, so that the airbag 32 is inflated at a stretch. After the formation of a small-capacity airbag at an early stage, the three sewing portions 39 are broken from the radially inner side to the outer side as the internal pressure of the airbag 32 increases, so that the airbag 32 Can gradually increase the volume while maintaining an appropriate internal pressure, and finally develop a flat shape in the front-rear direction to exert the maximum restraining force.

  Until all of the three sewing parts 39 are broken, the vent hole cover 50 has both ends 52 and 53 of the closing part 51 restrained by the sewing parts 39 of the first base cloth 36 and the second base cloth 37, and the extension part Since the front end portion 56 of 55 is sandwiched between the retainer 22 and the fixing ring 33, the vent hole 37b is closed by the vent hole cover 50 to prevent gas leakage, and the internal pressure of the airbag 32 is quickly raised. The internal pressure can be appropriately maintained.

  When the three sewing parts 39 are all broken at the end of deployment of the airbag 32, the leading end part 56 of the extension part 55 is sandwiched and fixed by the retainer 22 and the fixing ring 33. 53d is released, so that a part of the intermediate part 54 of the closed part 51 (the upper part in FIG. 4) of the vent hole cover 50 is pushed out from the vent hole 37b as shown in FIG. The vent hole 37b opens. As a result, excess gas in the airbag 32 is discharged from the vent hole 37b, and an excessive increase in the internal pressure of the airbag 32 can be prevented, and the load characteristics of the airbag 32 can be set as desired. At this time, since the vent hole 37b is provided in the second base cloth 37, the gas discharged from the vent hole 37b does not directly hit the driver, and the driver does not feel uncomfortable.

  As shown in FIG. 9, in the deployed state of the airbag 32, the vent hole 37 b is located outside the deployment locus 23 of the front cover 17 and located outside the inflator 31, and the steering It is preferable to set so as to be located inside the wheel body 21. In this way, when the airbag is deployed, it is possible to prevent the vent hole 37b from interfering with the front cover 17 that is broken and deployed, interfering with the inflator 31, or interfering with the steering wheel body 21. The exhaust from the vent hole 37b can be performed smoothly and stably, and the load characteristics of the airbag 32 can be stabilized.

Moreover, in this airbag apparatus, since the front-end | tip part 56 of the extension part 55 is clamped by the retainer 22 and the fixing ring 33, when the airbag 32 is manufactured, the intermediate part 54 of the vent hole cover 50 is displaced. It is possible to prevent the intermediate portion 54 of the vent hole cover 50 from being displaced radially outside the airbag 32 even when the airbag 32 is inflated and rounded during the deployment of the airbag 32. Can be prevented.
Further, in this embodiment, since the width of the closing portion 51 becomes narrower as it approaches the both end portions 52 and 53 from the intermediate portion 54, the resistance when the vent hole cover 50 comes out of the vent hole 37b is reduced. be able to.

As a result, the closure of the vent hole 37b can be maintained until the sewing part 39 is broken and at least one of the end parts 52, 53 of the closure part 51 of the vent hole cover 50 is detached from the airbag 32. The vent hole 37b can be opened when at least one of 53 is removed from the airbag 32, so that the internal pressure of the airbag can be appropriately controlled, and the airbag 32 can be appropriately controlled.
Moreover, since the front-end | tip part 56 of the extension part 55 functions as a reinforcement member which reinforces the 2nd base fabric 37 around the opening 37a, the circumference | surroundings of the opening 37a can be reinforced without increasing the number of parts.
At the time of manufacturing the airbag device, the tip 56 of the extended portion 55 of the vent hole cover 50 is overlapped with the center of the second base fabric 37, the opening 37a and the hole 55a are arranged concentrically, and the bolt 34 is vented. By inserting the through hole 55b of the hole cover 50 and the through hole 37c of the second base fabric 37, the vent hole cover 50 can be easily positioned and set on the airbag 32. Therefore, productivity is improved.

  As shown in FIG. 10, the weave directions X and Y of the second base fabric 37 are perpendicular to the straight line L connecting the center of the vent hole 37b and the center of the airbag 32 (center of the opening 37a). And preferably in parallel. In this way, the expansion of the second base fabric 37 can be minimized when the airbag 32 is deployed, and the deformation of the vent hole 37b can be minimized, and the discharge of gas from the vent hole 37b is stabilized. can do.

  In the above-described embodiment, as shown in FIG. 5, the end portions 52 and 53 of the vent hole cover 50 are sewn over the portion reaching the outermost sewn portion 39, but the outermost sewn portion 39. Further, the sewing of the vent hole cover 50 can be stopped at the inner sewing portion 39, for example, the second sewing portion 39 from the inner side. By configuring in this way, it is possible to set so that the vent hole 37b is already opened when the outermost sewing portion 39 is broken. Thereby, the timing at which the vent hole 37b is opened and the internal pressure of the airbag 32 can be adjusted.

In the above-described embodiment, the sewing portion 39 is formed in a spiral shape, but may be formed in a concentric shape, or the sewing portion 39 may be partially provided on the outer peripheral portion of the airbag 32 without being provided on the entire circumference. Good.
In the above-described embodiment, the breaking joint portion of the airbag 32 is constituted by the sewing portion 39, but the breaking joining portion is not limited to sewing, and may be constituted by weaving or joining.
The shape of the vent hole cover 50 is not limited to the above-described embodiment. For example, the distal end portion 56 of the extending portion 55 may be circular.
Further, in the above-described embodiment, the distal end portion 56 of the extending portion 55 of the vent hole cover 50 is disposed so as to cover the periphery of the opening (inflator opening) 37a of the second base cloth 37 and fastened together with the retainer 22. However, it may be partially fastened together with the retainer 22 around the opening 37a, or may be fastened by means other than the joint fastening with the retainer 22.
Further, in the above-described embodiments, the aspect of the airbag device stored in the handle has been described. However, the present invention can also be applied to an airbag device other than the retractable type in the handle.

It is a perspective view which shows the vehicle interior of the vehicle provided with the airbag apparatus which concerns on this invention. It is sectional drawing which follows the AA line of FIG. It is a disassembled perspective view of the airbag in one Example of the airbag apparatus which concerns on this invention. It is a rear view of the airbag in the said Example. It is sectional drawing which follows the BB line of FIG. It is sectional drawing of the airbag deployment initial stage of the said Example. It is sectional drawing of the airbag deployment latter stage of the said Example. It is a front view of the steering wheel in the said Example. It is a figure which shows the relative positional relationship of a steering wheel, an inflator, and a vent hole at the time of airbag deployment. It is a top view of the 2nd base fabric of an airbag. It is a top view of a vent hole cover.

Explanation of symbols

17 Front cover (airbag cover)
19 Rear cover (airbag cover)
21 Steering wheel body (grip)
32 Airbag 37a Opening (Inflator Opening)
37b Vent hole 39 Sewing part (break joint part)
50 Vent hole cover 51 Closure part 52, 53 End part 54 Intermediate part 55 Extension part 60, 61 Positioning line (mark)

Claims (8)

An airbag device comprising an airbag, an inflator opening, a vent hole provided on a side of the inflator opening, and a vent hole cover for closing the vent hole,
The vent hole cover is disposed inside the airbag , and has a band-shaped closed portion that covers the vent hole, and an extending portion that extends from the longitudinal intermediate portion of the closed portion toward the inflator opening. , Both ends of the closed portion are joined to the airbag at a break joint portion that breaks when the airbag is deployed,
The closing part is formed such that the middle part in the longitudinal direction is wider than the vent hole and closes the vent hole,
An end portion of the closing portion is formed so that a width thereof becomes narrower from the middle portion in the longitudinal direction toward the fracture joint portion .   The airbag device according to claim 1, wherein the extending portion covers the periphery of the inflator opening. The airbag apparatus according to claim 1 or 2, further comprising positioning means for positioning the vent hole cover with respect to the airbag when the both ends of the closing portion and the airbag are joined. The airbag device according to claim 3, wherein the positioning means is configured by making the color of the airbag different from the color of the vent hole cover. 5. The airbag device according to claim 3 , wherein the positioning unit includes a mark provided in a portion of the airbag where the vent hole cover is disposed. The airbag device according to any one of claims 3 to 5, wherein the positioning unit includes a mark provided in the vicinity of an end portion of the vent hole cover. An airbag cover for storing the airbag in a folded state;
The airbag according to any one of claims 1 to 6, wherein the vent hole is formed at a position that does not interfere with a deployment locus of the airbag cover in a deployed state of the airbag. apparatus. On the steering wheel of the vehicle,
The airbag device according to any one of claims 1 to 7, wherein the vent hole is positioned inside a grip portion of the steering wheel in a deployed state of the airbag.

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