JPWO2013018863A1 - Airbag device - Google Patents

Abstract

It is an object of the present invention to provide a configuration in which a folded airbag is covered with a sheet-like member by a simpler joining operation. The airbag device is incorporated into an airbag assembly panel having a lid that can be split open. The airbag device includes an inflator, an airbag, and an outer bag. The outer bag is formed into a bag shape having an opening by folding and joining each side edge portion of the sheet-like member at the middle portion in the longitudinal direction, and the folded air is attached to the inflator. Cover the bag in an inflatable state.

Description

  The present invention relates to an airbag device that inflates and deploys to protect an occupant when a vehicle collides.

  The airbag device for the passenger seat is disposed in the instrument panel in a normal state. In the event of a vehicle collision or the like, the airbag protects the occupant by opening the lid provided on the instrument panel and inflating and deploying the lid.

  In the airbag apparatus as described above, the airbag is surrounded by a plate made of resin or metal so that the airbag is inflated and deployed in the instrument panel in the direction of splitting the lid. For this reason, the airbag device tends to increase in weight.

  Therefore, Patent Documents 1 to 3 disclose a configuration in which a cloth or the like is sewn into a rectangular parallelepiped shape to form an outer bag, and the outer bag covers a part or the whole of a folded airbag. According to this configuration, the plate surrounding the folded airbag can be omitted or miniaturized, and the weight of the airbag device can be reduced.

JP 2011-93446 A Special table 2008-544920 International Publication No. 2009/008221

  However, in the techniques disclosed in Patent Documents 1 to 3, when sewing cloth or the like into a rectangular parallelepiped shape, it is necessary to sew side edges of side surfaces adjacent to each other in the rectangular parallelepiped shape. .

  Then, an object of this invention is to enable it to obtain the structure which covers the folded airbag with a sheet-like member by simpler joining operation | work.

  In order to solve the above-mentioned problem, a first aspect is an airbag device incorporated in an airbag assembly panel having a lid that can be split open, wherein the inflator can generate gas inside the lid, and the lid The airbag is folded in a state in which it can be disposed inside, and an airbag that can be inflated and deployed in a bag shape by the gas introduced from the inflator, and both side edges of the sheet-like member are folded back at the respective longitudinal intermediate portions. And an outer bag that covers the folded airbag in a state in which it can be inflated and deployed in a state of being attached to the inflator.

  A 2nd aspect is an airbag apparatus which concerns on a 1st aspect, Comprising: The fracture | rupture part which can be fractured | ruptured at the time of the expansion | deployment of the said airbag is provided in the said sheet-like member, The said outer bag is the said outer bag. Of these, the folded airbag is covered with the inflator attached to the peripheral edge of the opening in a state in which the rupture portion is broken and can be inflated and deployed.

  A 3rd aspect is an airbag apparatus which concerns on a 2nd aspect, Comprising: The said fracture | rupture part is provided between the folding | turning parts of the said both-sides edge part among the said sheet-like members.

  A 4th aspect is an airbag apparatus which concerns on a 2nd or 3rd aspect, Comprising: The said outer bag is folded so that a rectangular parallelepiped box shape may be made.

  A 5th aspect is an airbag apparatus which concerns on any one 1st-4th aspect, Comprising: The peripheral part of the said opening of the said outer bag is folded inward in the state which overlapped at least one part. And the peripheral edge of the opening of the outer bag is fixed to the inflator via the at least part of the overlapping portion.

  A 6th aspect is an airbag apparatus which concerns on a 5th aspect, Comprising: The peripheral part of the said opening of the said outer bag is folded inside so that a square-shaped bottom part may be formed, The said outer bag's said The peripheral edge of the opening is overlapped at a location corresponding to the corner of the bottom.

  A seventh aspect is an airbag device according to any one of the second to sixth aspects, wherein the outer bag is attached to the airbag.

  An eighth aspect is the airbag device according to the first aspect, wherein an inflator attachment hole is formed in the sheet-like member, the outer bag is formed in a bag shape having an opening, and the inflator is the inflator. The folded airbag is covered in a state where it can be inflated and deployed through the opening while being attached to the peripheral edge of the attachment hole.

  A ninth aspect is the airbag device according to the eighth aspect, wherein the inflator mounting hole is formed between the folded portions of the side edge portions of the sheet-like member.

  A tenth aspect is an airbag device according to the eighth or ninth aspect, wherein the outer bag is folded so as to form a rectangular parallelepiped box shape.

  An eleventh aspect is an airbag device according to any one of the eighth to tenth aspects, wherein the airbag and the lid being inflated and deployed on a peripheral portion surrounding the opening of the outer bag. An extending piece that can be sandwiched between the outer peripheral edge of the opening is provided.

  A twelfth aspect is an airbag device according to any one of the eighth to eleventh aspects, wherein the outer periphery of the outer bag surrounds the opening and covers the opening, and the airbag is inflated and deployed. An inflator mounting extension in which a ceiling piece provided with a breakable portion that is sometimes broken is extended, is extended to reach the inflator mounting hole in the ceiling piece, and is attached to the inflator together with a peripheral portion of the inflator mounting hole A piece is provided.

  A thirteenth aspect is an airbag device according to any one of the eighth to twelfth aspects, wherein the outer bag is attached to the airbag.

  A fourteenth aspect is an airbag apparatus according to the thirteenth aspect, wherein the outer bag is attached to the airbag around the inflator attachment hole.

  A fifteenth aspect is the airbag device according to the fourteenth aspect, wherein the outer bag is attached to the airbag via a circular joining portion surrounding the inflator attachment hole.

  A sixteenth aspect is an airbag device according to the fourteenth aspect, wherein the outer bag is folded so as to form a rectangular parallelepiped box shape, and the surface on which the inflator mounting hole is formed in the outer bag. The outer bag is attached to the airbag via rectangular joints along the four sides around the bag.

  A seventeenth aspect is an airbag device according to any one of the first to sixteenth aspects, wherein a part of the outer bag stands on an outer periphery of the airbag being inflated and deployed and the lid. It is arrange | positioned so that it can pinch | interpose between the provided lid side surrounding wall parts.

  An eighteenth aspect is the airbag apparatus according to any one of the first to seventeenth aspects, further comprising an inflator fixing member fixed to the inflator and fixable to a vehicle body side member, and the inflator fixing member Is fixed to the vehicle body side member, so that the inflator is fixed at a fixed position inside the lid.

  A nineteenth aspect is an airbag device according to any one of the first to eighteenth aspects, covers the airbag folded inside the outer bag, and breaks when the airbag is inflated and deployed. Further possible auxiliary wrap members are provided.

  The twentieth aspect is an airbag device according to any one of the first to nineteenth aspects, wherein the airbag apparatus is connected to the inflator and a lid side peripheral wall portion erected on the outer periphery of the lid. The apparatus further includes a belt that holds the inflator at a fixed position inside the lid.

  A twenty-first aspect is the airbag device according to the twentieth aspect, wherein one end of the belt is joined to an inflator, and the other end of the belt passes through an attachment hole formed in the lid side peripheral wall. Are joined to the outer bag.

  A twenty-second aspect is the airbag device according to the twentieth aspect, wherein a longitudinal intermediate portion of the belt is passed through an attachment hole formed in the lid side peripheral wall portion, and both end portions of the belt are the inflator. It is joined to.

  A twenty-third aspect is the airbag device according to the twentieth aspect, wherein one end portion of the belt is joined to the inflator, and the other end portion of the belt is engaged with the lid side peripheral wall portion via a hook portion. It is fixed.

  According to the 1st aspect, the bag-shaped outer bag is formed by each side edge part of the said sheet-like member turning back and joining in each longitudinal direction intermediate part. The outer bag covers the folded airbag in a state where it can be inflated and deployed while being attached to the inflator. For this reason, the structure which covers the folded airbag with a sheet-like member can be obtained by simpler joining work.

  According to the 2nd aspect, the whole airbag can be covered easily and the folding state of an airbag can be maintained more reliably.

  According to the third aspect, the airbag can be inflated and deployed so as to be inflated and deployed on the opposite side of the inflator attached to the peripheral portion of the opening.

  According to the 4th aspect, the folded airbag and the outer bag which covers it can make a rectangular parallelepiped external appearance.

  According to the fifth aspect, the outer bag and the inflator can be firmly attached.

  According to the 6th aspect, an outer bag and an inflator can be firmly fixed, forming a bottom part in a square shape.

  According to the 7th aspect, since the said outer bag is attached to the said airbag, an outer bag and an airbag can be handled as an integral component in the middle of manufacture of an airbag apparatus.

  According to the airbag device according to the eighth aspect, each of the side edge portions of the sheet-like member is folded and joined at the middle portion in the longitudinal direction to form a bag-like outer bag having an opening. Yes. And this outer bag has covered the said folded airbag in the state which can be inflate-deployed through the said opening in the state by which the inflator was attached to the peripheral part of the said inflator attachment hole. For this reason, the structure which covers the folded airbag with a sheet-like member can be obtained by simpler joining work.

  According to the ninth aspect, the airbag can be guided such that the airbag is inflated and deployed from the inflator attached to the inflator attachment hole to the lid side.

  According to the 10th aspect, the folded airbag and the outer bag which covers it can make a rectangular parallelepiped external appearance.

  According to the eleventh aspect, since the extending piece provided at the peripheral edge portion surrounding the opening of the outer bag is sandwiched between the airbag being inflated and deployed and the outer peripheral edge portion of the lid opening, The state in which the bag surrounds the airbag being inflated and deployed can be more reliably maintained. Thereby, it can suppress more reliably that an airbag spreads in a radial direction between a lid and an inflator. Further, the extending piece suppresses direct rubbing between the airbag and the lid opening.

  According to the 12th aspect, the state which covered the folded airbag can be maintained more reliably.

  According to the thirteenth aspect, since the outer bag is attached to the airbag, the outer bag and the airbag can be handled as an integral component in the course of manufacturing the airbag device.

  According to the fourteenth aspect, since the outer bag is attached to the airbag at the periphery of the inflator attachment hole, it is easy to process the outer bag after attachment. Further, since the airbag is attached to the outer bag around the inflator attachment hole, the airbag is stably inflated and deployed.

  According to the fifteenth aspect, since the outer bag is attached to the airbag via the circular joining portion surrounding the inflator attachment hole, the force applied to the joining portion is dispersed when the airbag is inflated and deployed. The outer bag and the airbag are difficult to come off.

  According to the 16th aspect, it becomes easy for an outer bag to maintain a rectangular parallelepiped box shape.

  According to the seventeenth aspect, a part of the outer bag is sandwiched between the airbag being inflated and deployed and the lid side peripheral wall, and the state surrounding the airbag is maintained. For this reason, it can suppress more reliably that an airbag spreads in a radial direction.

  According to the eighteenth aspect, the fixing structure between the inflator and the airbag built-in panel can be simplified or omitted.

  According to the nineteenth aspect, since the folded airbag can be more reliably maintained, the operation of covering the outer bag can be easily performed.

  According to the twentieth aspect, the inflator can be held at a fixed position inside the lid by a lightweight configuration using a belt.

  According to the twenty-first aspect, since the other end portion of the belt is joined to the outer bag through the attachment hole formed in the lid side peripheral wall portion, the outer bag is inflated and deployed on the lid side. It becomes difficult to pull out from between the peripheral walls. Thereby, it can suppress more reliably that an airbag spreads in a radial direction.

  According to the twenty-second aspect, since both end portions of the belt may be joined to the inflator, the joining structure can be simplified.

  According to the twenty-third aspect, the other end portion of the belt can be easily locked and fixed to the lid-side peripheral wall portion via the hook portion.

It is sectional drawing which shows the whole structure of the airbag apparatus which concerns on 1st Embodiment. It is a perspective view which shows an airbag apparatus. It is a plane expanded view of a sheet-like member. It is the figure which showed the stitching | suture line and the fold line in FIG. It is explanatory drawing which shows the manufacturing process of an outer bag. It is explanatory drawing which shows the manufacturing process of an outer bag. It is a figure which shows the modification which reversed the outer bag. It is a perspective view which shows the airbag apparatus which concerns on the modification same as the above. It is explanatory drawing which shows operation | movement of an airbag apparatus. It is explanatory drawing which shows operation | movement of an airbag apparatus. It is explanatory drawing which shows operation | movement of an airbag apparatus. It is a perspective view which shows the other modification of an airbag apparatus. It is a perspective view which shows the airbag apparatus which concerns on 2nd Embodiment. It is a plane expanded view of a sheet-like member. It is a plane expanded view of a sheet-like member. It is explanatory drawing which shows the manufacturing process of an outer bag. It is explanatory drawing which shows the manufacturing process of an outer bag. It is a figure which shows the modification which reversed the outer bag. It is a perspective view which shows the airbag apparatus which concerns on the modification same as the above. It is explanatory drawing which shows operation | movement of an airbag apparatus. It is explanatory drawing which shows operation | movement of an airbag apparatus. It is explanatory drawing which shows operation | movement of an airbag apparatus. It is explanatory drawing which shows operation | movement of the airbag apparatus which concerns on a modification. It is explanatory drawing which shows operation | movement of the airbag apparatus which concerns on a modification. It is a perspective view which shows the modification of the airbag apparatus which concerns on a modification. It is a perspective view which shows the airbag apparatus which concerns on 3rd Embodiment. It is a perspective view which shows an airbag apparatus same as the above. It is a plane expanded view of a sheet-like member. It is a plane expanded view of a sheet-like member. It is explanatory drawing which shows the manufacturing process of an outer bag. It is explanatory drawing which shows the manufacturing process of an outer bag. It is a figure which shows the modification which reversed the outer bag. It is a perspective view which shows the airbag apparatus which concerns on the modification same as the above. It is explanatory drawing which shows operation | movement of an airbag apparatus. It is explanatory drawing which shows operation | movement of an airbag apparatus. It is explanatory drawing which shows operation | movement of an airbag apparatus. It is a perspective view which shows an auxiliary | assistant wrap member. It is a perspective view which shows the modification incorporating an auxiliary | assistant wrap member. It is a figure which shows the modification which attached the outer bag and the airbag directly. It is a figure which shows the other modification which attached the outer bag and the airbag directly. It is sectional drawing which shows the modification which assembled | attached the airbag apparatus to the lid panel. It is a perspective view which shows the state which covered the airbag folded up in the modification same as the above with the outer bag. It is explanatory drawing which shows operation | movement of the airbag apparatus which concerns on a modification same as the above. It is explanatory drawing which shows operation | movement of the airbag apparatus which concerns on a modification same as the above. It is explanatory drawing which shows operation | movement of the airbag apparatus which concerns on a modification same as the above. It is explanatory drawing which shows operation | movement of the airbag apparatus which concerns on another modification. It is explanatory drawing which shows operation | movement of the airbag apparatus which concerns on another modification. It is explanatory drawing which shows operation | movement of the airbag apparatus which concerns on another modification. It is explanatory drawing which shows operation | movement of the airbag apparatus which concerns on another modification. It is explanatory drawing which shows operation | movement of the airbag apparatus which concerns on another modification. It is explanatory drawing which shows operation | movement of the airbag apparatus which concerns on another modification. It is a perspective view which shows the airbag apparatus which concerns on 4th Embodiment. It is explanatory drawing which shows the outer bag manufacturing process of an airbag apparatus same as the above. It is explanatory drawing which shows the outer bag manufacturing process of an airbag apparatus same as the above. It is explanatory drawing which shows the outer bag manufacturing process of an airbag apparatus same as the above. It is explanatory drawing which shows the manufacturing process of an airbag apparatus same as the above. It is explanatory drawing which shows the manufacturing process of an airbag apparatus same as the above. It is explanatory drawing which shows the manufacturing process of an airbag apparatus same as the above. It is a figure which shows the modification which attached the outer bag and the airbag directly.

  Hereinafter, the airbag apparatus according to the embodiment will be described.

  First, embodiments common to the following embodiments will be described.

  That is, the airbag device is an airbag device that is assembled into an airbag assembly panel having a lid that can be split open, and includes an inflator, an airbag, and an outer bag.

  The inflator is disposed inside the lid and is configured to generate gas.

  The airbag is folded in a normal state and is disposed between the lid and the inflator. The airbag is configured to be inflated and deployed in a bag shape by a gas introduced from the inflator.

  In the normal state, the outer bag covers the folded airbag, and suppresses the airbag from expanding in the radial direction when the airbag is inflated and deployed. Here, the outer bag should just cover the said airbag in the aspect surrounding the circumference | surroundings of the folded airbag at least, and does not need to cover the whole said airbag.

  In the present embodiment, the outer bag is configured by a sheet-like member. The sheet-like member includes a pair of parallel side edges, and each of the side edges of the sheet-like member is folded back and joined at the middle portion in the longitudinal direction so that the sheet-like member becomes a bag. It is formed into a shape. And the outer bag formed in a bag shape in this way includes a peripheral wall portion that can surround the periphery of the airbag, and in a form surrounding the periphery of the airbag folded by the peripheral wall portion, Cover the folded airbag.

  According to this airbag apparatus, each of the side edge portions of the sheet-like member is folded back and joined at the respective longitudinal intermediate portions to form a bag-like outer bag. The outer bag covers the folded airbag in a state where it can be inflated and deployed while being attached to the inflator. For this reason, the structure which covers the folded airbag with a sheet-like member can be obtained by simpler joining work.

  As an aspect which covers the airbag folded in the state which the outer bag formed in the bag shape as mentioned above was attached to the inflator, the following two aspects are assumed at least.

  The first is an aspect in which an inflator attachment hole is formed in the sheet-like member, the inflator is attached to the peripheral portion of the inflator attachment hole, and the airbag is inflated and deployed through the opening of the outer bag.

  The second is the reverse of the above, i.e., a rupture portion is formed in the sheet-like member, an inflator is attached to the peripheral edge of the opening of the outer bag, and the airbag breaks the rupture portion to remove the outer bag. It is an aspect which expands and develops.

  The first aspect will be described more specifically in the following first to third embodiments, and the second aspect will be described more specifically in the fourth embodiment.

{First embodiment}
Hereinafter, the airbag apparatus according to the first embodiment will be described. FIG. 1 is a cross-sectional view showing an overall configuration of an airbag apparatus 20 according to the present embodiment, and FIG. 2 is a perspective view showing the airbag apparatus 20. In addition, in FIG. 1, the state which integrated the airbag apparatus 20 in the instrument panel 10 is shown. Moreover, FIG. 1 has shown the cross section in the surface along the front-back direction of a vehicle.

  The airbag device 20 is incorporated in the instrument panel 10 in front of the passenger seat of the vehicle, and inflates and deploys in front of the passenger seat occupant when the vehicle collides, etc., and receives the passenger seat occupant and absorbs the impact. It is configured.

  That is, the instrument panel 10 is disposed as an airbag built-in panel in front of the passenger seat of the vehicle. The instrument panel 10 has a lid 12 that can be split open. Here, the instrument panel 10 is formed of resin. Further, a groove-like tear line 13 is formed on the inner peripheral surface of the instrument panel 10 so as to surround the substantially rectangular region from three sides (here, the rear and both sides of the vehicle). A region surrounded by 13 is a lid 12. The airbag device 20 is incorporated inside the lid 12. When the airbag device 20 is operated, the instrument panel 10 is torn along the tear line 13 so that the lid 12 is opened and an opening is formed. A lid-side peripheral wall portion 14 is formed on the inner surface of the instrument panel 10 so as to stand upright on the outer periphery of the lid 12. The lid side peripheral wall portion 14 is on the outer peripheral side of the tear line 13 and surrounds the lid 12 over the entire outer periphery. The formation example of the tear line 13 is not limited to the above example. For example, tear lines may be formed in an H-shape or a radial shape on the instrument panel, and the instrument panel may be divided into a plurality of portions and split open. In short, the tear line only needs to be formed in such a manner that an opening for airbag deployment can be formed when the airbag device 20 is operated.

  A vehicle body side member 18 that is a member fixed to the body of the vehicle is disposed inside the instrument panel 10. Here, it is assumed that the vehicle body side member 18 is a member fixed to the body and disposed along the vehicle width direction in the instrument panel 10 (a so-called lean hose member). The instrument panel 10 is fixed to the vehicle body by a mounting structure including a well-known structure, and the main body side member is also fixed to the vehicle body. Therefore, the instrument panel 10 and the vehicle body side member 18 are fixed. The positional relationship is maintained. Therefore, by attaching the airbag device 20 to the vehicle body side member 18, the airbag device 20 is also disposed at a fixed position with respect to the instrument panel 10.

  The airbag device 20 is incorporated in the instrument panel 10 as described above. Here, that the airbag device 20 is incorporated into the instrument panel 10 includes a case where the airbag device 20 is disposed at a position where the airbag device 20 can be inflated and deployed from the instrument panel 10. It is not essential to be physically and mechanically fixed to the ment panel 10.

  The airbag device 20 includes an inflator 22, an airbag 30, and an outer bag 40.

  The inflator 22 includes an ignition device, a gas generating agent, and the like, and is disposed inside the lid 12. The inflator 22 is configured to receive an ignition command signal from an impact detection unit or the like installed in the vehicle itself and burn the gas generating agent by the ignition device, thereby generating gas. Here, the inflator 22 is formed in a short cylindrical shape, and a collar portion 24 is formed on the outer periphery thereof with a metal plate or the like. Here, the collar portion 24 is formed in a square shape. Further, a screw portion 25 is projected from one main surface of the collar portion 24, and the inflator 22, the airbag 30, the outer bag 40, and the like are attached using the screw portion 25.

  The airbag 30 is formed in a bag shape having a gas inlet with cloth or the like. The inflator 22 is attached to the airbag 30 at a position and posture where gas can be introduced into the airbag 30 through the gas inlet. In a normal state, the airbag 30 is folded and disposed inside the lid 12, here, between the lid 12 and the inflator 22. The folding configuration of the airbag 30 may be a configuration that is folded along a predetermined folding line or a configuration that is folded so as to be crumpled. But it is preferable that the airbag 30 is folded so that it may form a rectangular parallelepiped shape. When the vehicle is inflated and deployed at the time of a vehicle collision or the like, the airbag 30 is inflated so as to open the lid 12 and project outward from the instrument panel 10 by the gas introduced from the inflator 22 through the gas inlet. Then, it expands and expands in a bag shape toward the passenger seat passenger side, which is the vehicle interior side.

  The outer bag 40 is configured by sewing a foldable and joinable flexible sheet-like member 42 (cloth or resin sheet or the like). Joining is preferably performed by sewing, and here also will be described with an example of sewing, but this is not essential.

  The outer bag 40 is formed in a bag shape having an opening 42h by folding and joining each side edge portion of the sheet-like member 42 at the respective intermediate portions in the longitudinal direction. An inflator attachment hole 43 is formed in the sheet-like member 42. As will be described in detail later, the airbag 30 in which the outer bag 40 is folded is covered with the inflator 22 attached to the peripheral portion of the inflator attachment hole 43 so as to be inflatable and deployable through the opening 42h. Yes.

  The outer bag 40 will be described more specifically.

  In manufacturing the outer bag 40, first, a sheet-like member 42 shown in FIGS. 3 and 4 is prepared. FIG. 3 is a plan development view of the sheet-like member 42, and FIG. 4 is a view showing the stitching line 42a and the folding line 42b in the development view of the sheet-like member 42 shown in FIG. In FIG. 4, the stitching line 42a is indicated by a dotted line, and the folding line 42b is indicated by a two-dot chain line.

  The sheet-like member 42 is formed in a rectangular shape, and has a size enough to cover the airbag 30 folded in a bag-like state as will be described later. An inflator mounting hole 43 is formed in an intermediate part (here, the central part) of the opposite side of one side of the sheet-like member 42, and a fixing hole 43 a (here) is formed in the peripheral part of the inflator mounting hole 43. Then four) are formed.

  The sheet-like member 42 is folded in two along a fold line F indicated by a one-dot chain line in FIG. 4, and both side edges thereof are stitched along a stitching line 42a (see FIG. 5).

  The bi-fold line F is a line that divides the sheet-like member 42 into two in the extending direction of the opposite side on one side thereof. The fold line F is also a line extending along the extending direction of the opposite side of the sheet-like member 42. In the final form of the outer bag 40, as will be described later, the bottom 40a is in a state of being extended in a flat shape, and therefore the fold line F is not an actually folded portion. The fold line F is also a line that crosses the inflator mounting hole 43. In other words, it can be said that the inflator mounting hole 43 is formed between the folded portions of the side edge portions of the sheet-like member 42. With respect to the fold line F, the stitching lines 42a at both side edges of the sheet-like member 42 are orthogonal to each other. The extending direction of the stitching line 42a is also the direction along the main inflation / deployment direction of the airbag 30 (that is, the direction toward the lid 12).

  It is not essential that the fold line F divides the sheet-like member 42 into two equal parts, and the fold line may be provided at a position deviated from the center of the sheet-like member 42.

  Therefore, by sewing the sheet-like member 42 as described above, the bag-like outer bag 40 in which the inflator attachment hole 43 is formed at the bottom and the opening 42h is formed at a position facing the inflator attachment hole 43 is obtained. It is formed. In addition, the outer bag 40 may be overlapped with a plurality of cloths or the like entirely or partially according to the need for strength or the like. In addition, there may be a supplemental stitching portion or the like that is not related to the formation of the bag. The height of the outer bag 40 can be adjusted by appropriately adjusting the size of the sheet-like member 42 and the like.

  As shown in FIG. 6, the outer bag 40 is preferably folded so as to form a rectangular parallelepiped box. Here, the outer bag 40 includes a bottom portion 40a that is a substantially rectangular portion (a portion where the inflator attachment hole 43 is formed) to which the inflator 22 is fixed, and a peripheral wall portion that surrounds one main surface side of the bottom portion 40a in a substantially square annular shape. 40b. The height dimension of the peripheral wall portion 40b may be set to be the same as or larger than the dimension in the thickness direction of the folded airbag 30 (inflated and deployed direction of the airbag 30). By adjusting the height dimension of the peripheral wall portion 40b, the height (depth) of the outer bag 40 can be easily adjusted.

  When the sheet-like member 42 is folded as described above, cone-shaped bag-like portions remain on both sides of the bottom 40a. The bag-like portion is formed in the ear portion 40c by being folded in a triangular shape. The ear portion 40c may be left extending outside the outer bag 40, or may be folded back toward the peripheral edge portion 40b or the bottom portion 40a. Further, the ear portion 40 c may be folded into the outer bag 40. However, it is not essential that the outer bag 40 has a rectangular parallelepiped box shape, and the outer bag 40 may have an external shape such as a cylindrical shape or a spherical shape.

  The airbag 30 and the inflator 22 are attached and fixed to the outer bag 40 as follows.

  That is, as shown in FIGS. 1 and 2, in the state where the screw portion 25 protruding from the flange portion 24 of the inflator 22 is inserted into the fixing hole 43 a at the peripheral portion of the inflator mounting hole 43 of the outer bag 40. A part of 22 is disposed in the inflator mounting hole 43. The screw portion 25 projecting from the flange portion 24 of the inflator 22 is inserted into a fixing hole formed in the peripheral portion of the gas introduction port of the airbag 30 and is attached (temporary) to the airbag 30. Fixed).

  A fixing bracket 28 is overlapped with the collar portion 24 of the inflator 22 from the outside of the outer bag 40. A hole corresponding to the screw portion 25 is formed in the fixing bracket 28, and a nut 29 is screwed and fastened to the screw portion 25 protruding from the hole. Thereby, between the collar part 24 and the fixing bracket 28, the peripheral part of the gas introduction port in the airbag 30 and the peripheral part of the inflator mounting hole 43 in the outer bag 40 are sandwiched and fixed. Thereby, the airbag 30 and the inflator 22 are attached and fixed to the outer bag 40.

  In addition, the operation | work which folds the airbag 30 and the operation | work which folds the outer bag 40 in a rectangular parallelepiped box shape may be performed in any step.

  An inflator fixing member 46 is fixed to the inflator 22 (see FIG. 1). The inflator fixing member 46 is a member formed of a metal plate or the like, and is here formed in a shape that bends in a substantially L shape. Here, the nut 29 is screwed and fastened to the screw portion 25 in a state where the screw portion 25 is inserted into the one end portion of the inflator fixing member 46, so that one end portion of the inflator fixing member 46 is connected to the fixing bracket 28. The inflator fixing member 46 is fixed to the inflator 22 by tightening and fixing between the outer surface of the nut and the nut 29. The other end of the inflator fixing member 46 is formed in a shape that can be fixed to the vehicle body side member 18. Here, the fixing bolt 18 </ b> B protruding from the vehicle body side member 18 is connected to the inflator fixing member 46. The inflator fixing member 46 is fixed to the vehicle body side member 18 by inserting the other end portion and screwing and fastening the nut 18N to the fixing bolt 18B. The inflator 22 is fixed at a fixed position inside the lid 12 by fixing the inflator fixing member 46 to the vehicle body side member 18.

  In the present embodiment, since the airbag device 20 is fixed to the vehicle body side member 18 and is not fixed to the instrument panel 10, the airbag device 20 can be easily assembled.

  The fixing of the inflator fixing member 46 to the inflator 22 or the vehicle body side member 18 is not limited to the above example, and caulking, welding, a fitting structure, or a composite configuration thereof may be used.

  In the above example, the sheet-like member 42 is stitched to form the bag-like outer bag 40, and then the folded airbag 30 is accommodated in the outer bag 40 as it is. . As shown in FIGS. 7 and 8, after the sheet-like member 42 is sewn and formed into a bag shape, the bag-like sheet-like member 42 may be inverted to constitute the outer bag 40B. In this case, the ear portion 40c may be kept folded in the outer bag 40B.

  9-11 is explanatory drawing which shows the expansion | deployment operation | movement of the said airbag apparatus 20. As shown in FIG. In addition, in the explanatory view showing these unfolding operations, they are simplified for convenience of explanation.

  First, in a normal state before the deployment operation, as shown in FIG. 9, the folded airbag 30 is disposed between the lid 12 and the inflator 22. In this state, the lid-side peripheral wall portion 14 surrounds the folded airbag 30 from the surrounding four sides. Moreover, the peripheral wall part 40b of the outer bag 40 surrounds the folded airbag 30 from four surroundings.

  In this state, when the gas generated from the inflator 22 is introduced into the airbag 30, the airbag 30 is in a space surrounded by the lid 12, the lid side peripheral wall portion 14, and the inflator 22, as shown in FIG. The expansion starts.

  At this time, in the main inflation and deployment direction of the airbag 30 (the direction from the inflator 22 toward the lid 12), the inflator 22 is fixed at a position away from the lid 12 by the inflator fixing member 46. The expansion / deployment force in the protruding direction of 30 acts as a force for dividing the tear line 13 of the lid 12. Thereby, the lid 12 is split open and an opening is formed in the instrument panel 10.

  At this time, the airbag 30 tends to be inflated and deployed in the radial direction toward the periphery with the main inflating and deploying direction (direction from the inflator 22 toward the lid 12) as the center. In this case, in the portion where the lid side peripheral wall portion 14 is present, the airbag 30 to be inflated and deployed is pressed toward the inner surface of the lid side peripheral wall portion 14, and therefore, between the airbag 30 and the lid side peripheral wall portion 14. Thus, a part of the peripheral wall 40b (a part close to the opening 42h) is held so as to be sandwiched. Thereby, the part interposed between the lid side peripheral wall part 14 and the inflator 22 in the peripheral wall part 40b receives the entire vicinity of the inflator 22 in the airbag 30 to be inflated and deployed. Thus, it is possible to suppress the airbag 30 from being inflated and deployed outward so as to spread in the radial direction between the lid-side peripheral wall portion 14 and the inflator 22.

  When the lid 12 is split open, the airbag 30 is inflated and deployed outward through the opening of the instrument panel 10 as shown in FIG. Also at this time, a portion of the peripheral wall portion 40b interposed between the lid-side peripheral wall portion 14 and the inflator 22 is configured such that the peripheral wall portion 40b is sandwiched between the airbag 30 and the lid-side peripheral wall portion 14. The configuration in which the vicinity of the inflator 22 in the inflating and deploying airbag 30 is received over the entire periphery is maintained, and the airbag 30 is prevented from spreading in the radial direction between the lid side peripheral wall portion 14 and the inflator 22. .

  The airbag 30 is inflated and deployed between the instrument panel 10 and the passenger seat occupant, thereby receiving the passenger occupant and absorbing the impact.

  According to the airbag device configured as described above, each of the side edge portions of the sheet-like member 42 is folded back and joined at the middle portion in the longitudinal direction, whereby the bag-like outer bag 40 having the opening 42h. Is formed. The outer bag 40 covers the folded airbag 30 in a state where it can be inflated and deployed through the opening 42h in a state where the inflator 22 is attached to the peripheral portion of the inflator attachment hole 43. For this reason, the structure which covers the folded airbag 30 with the sheet-like member 42 can be obtained by a simple joining operation.

  Further, when the airbag 30 is inflated and deployed, the outer bag 40 can effectively suppress the airbag 30 from being deployed in the radial direction inside the instrument panel 10. Moreover, since the structure for that purpose can be mainly realized by the outer bag 40 composed of the sheet-like member 42, it is possible to reduce the number of parts, reduce the weight, and reduce the cost.

  Further, since the outer bag 40 prevents the airbag 30 from spreading in the radial direction between the lid-side peripheral wall portion 14 and the inflator 22, the height dimension of the lid-side peripheral wall portion 14 can be reduced. Alternatively, the lid side peripheral wall portion 14 itself can be eliminated as in the example described later, and the configuration of the instrument panel can be simplified and reduced in weight.

  In addition, since the sheet-like member 42 can be a rectangular shape or a shape close to a rectangular shape, when cutting the sheet-like member 42 from the original large cloth, a wasteful cloth is hardly generated. Therefore, the yield of the cloth can be increased.

  Moreover, since the outer bag 40 is folded so as to form a rectangular parallelepiped box shape, the folded airbag 30 and the outer bag 40 covering the airbag 30 can have a rectangular parallelepiped appearance. As a result, it is easy to stabilize the shapes of the folded airbag 30 and outer bag 40 and facilitate the storing operation.

  Further, since the inflator mounting hole 43 is formed between the folded portions of the side edge portions of the sheet-like member 42, the opening 42h is located at a position facing the inflator 22 attached to the peripheral portion of the inflator mounting hole 43. Can be provided. Accordingly, the airbag 30 can be smoothly inflated and deployed through the opening 42h on the front side of the inflator 22.

  Further, since the inflator 22 is fixed to the vehicle body side member 18 via the inflator fixing member 46, the fixing structure between the inflator 22 and the instrument panel 10 can be simplified or omitted.

  As a result, even when the lid side peripheral wall portion 14 is provided, there is no need to provide a configuration (mounting hole) or the like for fixing the airbag device 20 to the lid side peripheral wall portion 14. For this reason, when focusing on the lid side peripheral wall portion 14, the configuration can be simplified from such a viewpoint.

  In addition, it is not essential that the opening 42h of the outer bag 40 and the inflator 22 and the inflator attachment hole 43 are in a facing relationship. For example, as in the airbag device 20B2 according to the modification shown in FIG. 12, the inflator mounting hole 43 is formed in a portion constituting one surface of the peripheral wall portion 40B2b corresponding to the peripheral wall portion 40b in the outer bag 40B2 corresponding to the outer bag 40. A corresponding inflator attachment hole 43B2 may be formed and the inflator 22 may be attached.

{Second Embodiment}
An airbag device 20C according to the second embodiment will be described. FIG. 13 is a perspective view showing an airbag device 20C according to the present embodiment. In the description of the present embodiment, the same components as those described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The airbag device 20C includes an inflator 22, an airbag 30, and an outer bag 40C.

  The inflator 22 and the airbag 30 are the same as those described above.

  The outer bag 40C is a first extending piece that can be sandwiched between the airbag 30 being inflated and deployed and the outer peripheral edge of the lid 12 at the peripheral edge surrounding the opening 42h of the outer bag 40C. 50 and the second extending piece 52 are provided (see also FIG. 17).

  More specifically, the outer bag 40 </ b> C has a bottom portion 40 a and a peripheral wall portion 40 b like the outer bag 40. The peripheral wall portion 40b includes a pair of first side wall portions 40b1 extending from a pair of opposed long sides in the bottom portion 40a, and a pair of second side wall portions 40b2 extending from a pair of opposed short sides of the bottom portion 40a. Yes. The folded airbag 30 is surrounded from the surrounding four sides by the pair of first side wall portions 40b1 and the pair of second side wall portions 40b2.

  A first extending piece 50 is provided at the tip of the first side wall 40b1, and a second extending piece 52 is provided at the tip of the second side wall 40b2. The first extending portion 50 and the second extending portion 52 are formed in a substantially trapezoidal shape that is gradually narrowed toward the distal end side, and the upper portions of the folded airbag 30 do not overlap most of each. Can be covered.

  The first extending piece 50 and the second extending piece 52 are sandwiched between the airbag 30 being inflated and deployed and the outer peripheral surface of the lid 12 of the instrument panel 10 when the airbag 30 is inflated and deployed. It is configured to be possible (see FIG. 22). That is, the first extending piece 50 and the second extending piece 52 are set to dimensions that can extend outward through the opening formed in the instrument panel 10 when the airbag 30 is inflated and deployed. Has been.

  In addition, in this embodiment, you may abbreviate | omit the lid side surrounding wall part 14 formed in the instrument panel 10, and hereafter, it demonstrates on the assumption that the lid side surrounding wall part 14 is abbreviate | omitted.

  The outer bag 40C can be manufactured in the same procedure as the outer bag 40.

  That is, in manufacturing the outer bag 40C, first, a sheet-like member 42C shown in FIGS. 14 and 15 is prepared. FIG. 14 is a plan development view of the sheet-like member 42C, and FIG. 15 is a view showing the stitching line 42Ca and the folding line 42Cb in the development view of the sheet-like member 42C shown in FIG. In FIG. 15, the stitching line 42Ca is indicated by a dotted line, and the folding line 42Cb is indicated by a two-dot chain line.

  The sheet-like member 42C has a shape obtained by adding portions for forming the first extending piece 50 and the second extending piece 52 to the shape (that is, rectangular shape) of the sheet-like member 42 in the first embodiment. Yes. That is, in the sheet-like member 42 </ b> C, the first piece portion 41 </ b> Ca for forming the first extending piece 50 and the half in the width direction of the second extending piece 52 are formed on the opposite side of the sheet-like member 42. A second piece portion 41Cb for forming the portion is formed.

  And as shown in FIG. 16, similarly to the said 1st Embodiment, the sheet-like member 42C is folded in half and the both-sides edge part is stitched | sutured. As a result, as shown in FIG. 17, an inflator mounting hole 43 is formed at the bottom and an opening 42h is formed at a position facing the inflator mounting hole 43, and an opening 42h of the bag-like part. The outer bag 40C having the first extending piece 50 and the second extending piece 52 extending is manufactured. In addition, a pair of 2nd piece part 41Cb may be joined by sewing etc., and does not need to be joined.

  And the folded airbag 30 and the inflator 22 are attached to this outer bag 40C similarly to the said 1st Embodiment. Further, in a state where the folded airbag 30 is accommodated in the outer bag 40C, the first extending piece 50 and the second extending piece 50 are covered so as to cover a portion of the folded airbag 30 exposed through the opening 42h. When the extending piece 52 is folded, the airbag device 20C shown in FIG. 13 is manufactured.

  In the above example, the sheet-like member 42C is stitched to form the bag-like outer bag 40C, and then the folded airbag 30 is accommodated in the outer bag 40C as it is. . As shown in FIGS. 18 and 19, after the sheet-like member 42 </ b> C is sewn and formed into a bag shape, the bag-like sheet-like member 42 </ b> C may be inverted to constitute the outer bag 40 </ b> D.

  20-22 is explanatory drawing which shows the expansion | deployment operation | movement of the said airbag apparatus 20C.

  First, in a normal state before the deployment operation, as shown in FIG. 20, the folded airbag 30 is disposed between the lid 12 and the inflator 22. Further, the peripheral wall portion 40b of the outer bag 40C surrounds the folded airbag 30 from the surrounding four sides, and the first extending piece 50 and the second extending piece 52 are formed of the folded airbag 30. Covers the top.

  In this state, when the gas generated from the inflator 22 is introduced into the airbag 30, the airbag 30 is in a space surrounded by the lid 12, the lid side peripheral wall portion 14, and the inflator 22 as shown in FIG. 20. The expansion starts.

  As described in the first embodiment, the lid 12 is split open by this expansion and deployment force (see FIG. 21), and an opening is formed in the instrument panel 10.

  When an opening is formed in the instrument panel 10, the airbag 30 attempts to inflate and deploy outwardly from the instrument panel 10 through the opening. At this time, the first extending piece 50 and the second extending piece 52 of the outer bag 40 </ b> C are pushed outward through the opening of the instrument panel 10. When the airbag 30 protrudes outward through the opening of the instrument panel 10, the first extending piece 50 and the second extending piece 52 of the outer bag 40 </ b> C are the openings or lids of the instrument panel 10. 12 and the airbag 30 being inflated and deployed. Thereby, during the inflation and deployment of the airbag 30, the state in which the outer bag 40C surrounds the airbag 30 inside the instrument panel 10 is more reliably maintained. And the part which exists inside the instrument panel 10 among the outer bags 40C receives the part located inside the instrument panel 10 among the airbags 30 inflated and deployed, and the airbag 30 Is prevented from spreading in the radial direction inside the instrument panel 10.

  The airbag 30 is inflated and deployed between the instrument panel 10 and the passenger seat occupant, thereby receiving the passenger occupant and absorbing the impact.

  Even with the airbag device 20 </ b> C configured as described above, the same effects as those of the first embodiment can be obtained.

  In addition, the first extending piece 50 and the second extending piece 52 provided at the peripheral edge surrounding the opening 42h in the outer bag 40C are formed between the airbag 30 being inflated and deployed and the opening outer peripheral edge of the lid 12. Since it is sandwiched between them, it is possible to more reliably maintain the outer bag 40 </ b> C surrounding the airbag 30 and the lid 12 being inflated and deployed inside the instrument panel 10. Thereby, it can suppress more reliably that the airbag 30 spreads in the radial direction between the lid 12 and the inflator 22.

  In addition, since the first extending piece 50 and the second extending piece 52 are disposed between the opening outer peripheral edge portion of the lid 12 and the airbag 30 in a state where the airbag 30 is inflated and deployed, the lid 12 The opening is difficult to break. Further, direct rubbing between the airbag 30 and the opening of the lid 12 is suppressed.

  In the present embodiment, the lid side peripheral wall portion 14 described in the first embodiment has been described as an example, but the lid side peripheral wall portion 14 may be provided on the instrument panel 10.

  FIG. 23 to FIG. 25 are explanatory views showing the deployment operation of the airbag device 20 </ b> C according to the present embodiment when the lid side peripheral wall portion 14 is provided on the instrument panel 10.

  In this case, the basic deployment operation of the airbag device 20C is the same as that described with reference to FIGS.

  However, in the initial state, the folded airbag 30 is surrounded on all sides by the lid-side peripheral wall portion 14.

  Therefore, as shown in FIG. 24, when the airbag 30 is to be inflated and deployed, the airbag 30 to be inflated and deployed is directed toward the inner surface of the lid-side circumferential wall portion 14 in the portion where the lid-side circumferential wall portion 14 exists. Pressed. Thereby, it hold | maintains so that a part (part close | similar to opening 42h) of the surrounding wall part 40b of the outer bag 40C may be pinched | interposed between the airbag 30 and the lid side surrounding wall part 14. FIG. Thereby, the part interposed between the lid side peripheral wall part 14 and the inflator 22 in the peripheral wall part 40b receives the entire vicinity of the inflator 22 in the airbag 30 to be inflated and deployed. Thus, it is possible to suppress the airbag 30 from being inflated and deployed outward so as to spread in the radial direction between the lid-side peripheral wall portion 14 and the inflator 22.

  Further, even when the lid 12 is split open, as shown in FIG. 25, the peripheral wall portion 40 b is sandwiched between the airbag 30 and the lid-side peripheral wall portion 14, so that the lid-side peripheral wall of the peripheral wall portion 40 b. A configuration in which the portion interposed between the portion 14 and the inflator 22 receives the entire vicinity of the inflator 22 in the airbag 30 that is inflated and deployed is maintained. Thereby, it is suppressed that the airbag 30 spreads in the radial direction between the lid side peripheral wall part 14 and the inflator 22.

  As described above, even when the peripheral wall portion 40b is sandwiched between the airbag 30 being inflated and deployed and the peripheral wall portion 40b, the state in which the outer bag 40C suppresses the spread of the airbag 30 in the radial direction is maintained. The

{Third embodiment}
An airbag device 20E according to a third embodiment will be described. FIG.26 and FIG.27 is a perspective view which shows the airbag apparatus 20E which concerns on this embodiment. In the description of the present embodiment, the same components as those described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The airbag device 20E includes an inflator 22, an airbag 30, and an outer bag 40E.

  The inflator 22 and the airbag 30 are the same as those described above.

  The outer bag 40E has a configuration in which a ceiling piece 55 and an inflator mounting extension piece 57 are provided on the peripheral edge surrounding the opening 42h with respect to the outer bag 40 (see also FIGS. 28 to 31). ).

  More specifically, the outer bag 40E has a bottom portion 40a and a peripheral wall portion 40b, like the outer bag 40. The peripheral wall portion 40b includes a pair of first side wall portions 40b1 extending from a pair of opposed long sides in the bottom portion 40a, and a pair of second side wall portions 40b2 extending from a pair of opposed short sides of the bottom portion 40a. Yes. The folded airbag 30 is surrounded from the surrounding four sides by the pair of first side wall portions 40b1 and the pair of second side wall portions 40b2.

  A ceiling piece 55 extends from one of the pair of first side wall portions 40b1 and the pair of second side wall portions 40b, here, from the edge of one of the first side wall portions 40b1.

  The ceiling piece 55 is formed in a square shape, and is formed in a shape that can cover and close the opening 42h. Further, the ceiling piece 55 is formed with a breaking portion 55a that can be broken when the airbag 30 is inflated and deployed. Here, a breaking portion 55a is formed between the base end portion and the tip end portion of the ceiling piece 55 along the width direction thereof. The breaking portion 55a is formed by partially cutting the ceiling piece 55. Then, with the ceiling piece 55 blocking the opening 42h, the breaking portion 55a is disposed at a substantially central portion at the top of the folded airbag 30.

  An inflator mounting extension piece 57 is further extended from the tip of the ceiling piece 55. The inflator attachment extending piece 57 is formed to have a length that reaches the inflator attachment hole 43 through the outer periphery of the outer bag 40 </ b> E, and is configured to be attached to the inflator 22 together with the peripheral portion of the inflator attachment hole 43. . More specifically, the inflator attachment extending piece 57 is formed in a rectangular shape that is large enough to cover a part of the other first side wall 40b1 and bottom 40a. An arc-shaped recess 57g is formed at the tip of the inflator mounting extension piece 57 in accordance with the outer peripheral shape of the inflator 22, and a fixing hole 57a is formed at a position corresponding to the fixing hole 43a on the outer periphery of the arc-shaped recess 57g. Has been. And the inflator attachment extending piece 57 is arrange | positioned so that it may go around to the bottom part 40a through the outer surface side of the other 1st side wall part 40b1. In this state, the peripheral edge portion of the arc-shaped concave portion 57 g is arranged in alignment with the peripheral edge portion of the inflator mounting hole 43, and is fixed to the inflator 22 together with the peripheral edge portion of the inflator mounting hole 43. By this fixing structure, the state where the ceiling piece 55 covers the opening 42h is maintained. Further, in the normal state, the outer bag 40E and the folded airbag 30 and the instrument panel 10 are kept in a certain positional relationship.

  The outer bag 40E can be manufactured in the same procedure as the outer bag 40.

  That is, in manufacturing the outer bag 40E, first, a sheet-like member 42E shown in FIGS. 28 and 29 is prepared. FIG. 28 is a plan development view of the sheet-like member 42E, and FIG. 29 is a diagram showing a stitching line 42Ea and a folding line 42Eb in the development view of the sheet-like member 42E shown in FIG. In FIG. 29, the stitching line 42Ea is indicated by a dotted line, and the folding line 42Eb is indicated by a two-dot chain line.

  The sheet-like member 42E has a shape in which a portion for forming the ceiling piece 55 and the inflator attachment extending piece 57 is added to the shape of the sheet-like member 42 in the first embodiment (that is, a rectangular shape). That is, in the sheet-like member 42E, the first piece portion 41Ea for forming the ceiling piece 55 and the inflator attachment extending piece 57 are formed in the center of the portion corresponding to one side of the sheet-like member 42. A second piece portion 41Eb is formed.

  And as shown in FIG. 30, the sheet-like member 42E is folded in half and the both-sides edge part is stitched | sutured similarly to the said 1st Embodiment. As a result, as shown in FIG. 31, an inflator mounting hole 43 is formed at the bottom and an opening 42h is formed at a position facing the inflator mounting hole 43, and the opening 42h of the bag-like part. The outer bag 40E having the extending ceiling piece 55 and the inflator attachment extending piece 57 is manufactured.

  The folded airbag 30 is accommodated in the outer bag 40E. Further, the ceiling piece 55 and the inflator attachment extension piece 57 are routed so as to wrap the outer periphery of the bag-like portion of the folded airbag 30 and outer bag 40E, and the peripheral portion and arcuate recess of the inflator attachment hole 43 The inflator 22 is attached to the peripheral portion of 57 g. Thereby, the airbag apparatus 20E shown in FIG. 26 is manufactured.

  In the above example, the sheet-like member 42E is stitched to form the bag-like outer bag 40E, and then the folded airbag 30 is accommodated in the outer bag 40E. However, this is not necessarily required. . As shown in FIGS. 32 and 33, after the sheet-like member 42E is sewn and formed into a bag shape, the bag-like sheet-like member 42E may be inverted to constitute the outer bag 40F.

  34 to 36 are explanatory views showing the deployment operation of the airbag device 20E.

  First, in a normal state before the deployment operation, the folded airbag 30 is disposed between the lid 12 and the inflator 22, as shown in FIG. Further, the peripheral wall portion 40b of the outer bag 40E surrounds the folded airbag 30 from the surrounding four sides, and the ceiling piece 55 covers the upper portion of the folded airbag 30.

  In this state, when the gas generated from the inflator 22 is introduced into the airbag 30, the airbag 30 is in a space surrounded by the lid 12, the lid-side peripheral wall portion 14, and the inflator 22, as shown in FIG. The expansion starts.

  As described in the first embodiment, the lid 12 is split open by the expansion and deployment force, and an opening is formed in the instrument panel 10. Then, when the lid 12 is split open, the airbag 30 is inflated and deployed outward through the opening of the instrument panel 10 as shown in FIG. In addition, before and after the airbag 30 splits the lid 12, the fracture portion 55a of the outer bag 40E is also divided by the inflating and deploying force of the airbag 30.

  When the airbag 30 is inflated and deployed outward from the instrument panel 10, the divided ceiling piece 55 is pushed outward through the opening of the instrument panel 10. When the airbag 30 protrudes outward through the opening of the instrument panel 10, the divided ceiling piece 55 in the outer bag 40E is inflated with the opening of the instrument panel 10 or the lid 12. It is sandwiched between the bag 30. Thereby, during the inflation and deployment of the airbag 30, the state in which the outer bag 40E surrounds the airbag 30 inside the instrument panel 10 is more reliably maintained. And the part which exists inside the instrument panel 10 among the outer bags 40E receives the part located inside the instrument panel 10 among the airbags 30 inflated and deployed, and the airbag 30 Is prevented from spreading in the radial direction inside the instrument panel 10.

  The airbag 30 is inflated and deployed between the instrument panel 10 and the passenger seat occupant, thereby receiving the passenger occupant and absorbing the impact.

  The same effect as that of the first embodiment can also be obtained by the airbag device 20E configured as described above.

  In addition, since the ceiling piece 55 covers the opening 42h, the state in which the outer bag 40E covers the folded airbag 30 can be more reliably maintained. Thereby, the assembly operation | work etc. to the instrument panel 10 of this airbag apparatus 20E can be performed easily.

  Further, when the airbag 30 is inflated and deployed, the divided ceiling piece 55 is sandwiched between the opening or lid 12 of the instrument panel 10 and the airbag 30 being inflated and deployed. For this reason, the state in which the outer bag 40E surrounds the airbag 30 inside the instrument panel 10 is more reliably maintained, and the expansion of the airbag 30 in the radial direction can be more reliably maintained.

  In the present embodiment, the second extending portion 52 may be provided.

  Moreover, although this embodiment demonstrated by the example in which the lid side surrounding wall part 14 demonstrated in 1st Embodiment was abbreviate | omitted, the lid side surrounding wall part 14 may be provided in the instrument panel 10. FIG.

  As shown in FIGS. 37 and 38, the airbag device 20E may include an auxiliary wrap member (wrapping cloth) 60 that covers the airbag 30 folded inside the outer bag 40E. Here, the auxiliary wrap member 60 is formed in a rectangular shape, and inflator insertion recesses 62 that are recessed in an arc shape are formed at both ends thereof, and the screw portion 25 is inserted into the peripheral portion of the inflator insertion recess 62. A possible mounting hole 62a is formed. Moreover, the fracture | rupture part 64 which can be fractured | ruptured by the expansion | deployment deployment of the airbag 30 is formed in the longitudinal direction intermediate part. Here, the fracture | rupture part 64 is set as the structure by which the linear cut was formed intermittently similarly to the said fracture | rupture part 55a. In FIG. 38, the case where the inverted outer bag 40F is used is shown. Of course, the outer bag 40E that is not inverted may be used.

  The auxiliary wrap member 60 is mounted so as to cover the folded airbag 30, and both end portions thereof are pulled out to the inflator 22. The screw portion 25 of the inflator 22 is inserted into the attachment hole 62a, and the auxiliary wrap member 60 is attached and fixed to the inflator 22 using the attachment structure portion of the inflator 22, the airbag 30, and the outer bag 40F. Yes.

  By this auxiliary wrap member 60, the airbag 30 is maintained in a more reliably folded form. In particular, before the folded airbag 30 is put into the outer bag 40F, the auxiliary wrap member 60 is attached to keep the airbag 30 folded and the folded airbag. By making it difficult for the inflator 22 to separate from the airbag 30, the airbag 30 can be easily placed in the outer bag 40F.

  The auxiliary wrap member 60 is not limited to the above shape. For example, the auxiliary wrap member 60 may be formed in a cross shape extending along four side portions from the ceiling portion of the folded airbag 30.

  39 and 40, the outer bag 40E may be directly attached to the airbag 30.

  In the example shown in FIGS. 39 and 40, the outer bag 40 </ b> E is directly attached to the airbag 30 around the inflator attachment hole 43. More specifically, in the example shown in FIG. 39, the outer bag 40 </ b> E is directly fixed to the airbag 30 via a circular stitching portion 70 as a circular joint portion surrounding the inflator mounting hole 43. . Moreover, in the example shown in FIG. 40, the outer bag 40E is attached to the airbag 30 through the square stitching | suture part 72 as a square junction part along four sides around the bottom part 40a.

  The outer bag 40E can be sewn to the airbag 30 either before or after the airbag 30 is sewn into a bag shape, or before or after the outer bag 40E is sewn into a bag shape.

  According to the modification shown in FIGS. 39 and 40, since the outer bag 40E is directly attached to the airbag 30, the airbag 30 (or its molding) is in the middle of manufacturing before the inflator 22 is attached. The sheet-like member) and the outer bag 40E (or the sheet-like member for molding thereof) can be handled as an integral component, which is convenient in the work process.

  In particular, since the bottom 40a of the outer bag 40E is attached to the airbag 30, it is easy to process the outer bag 40E after attachment. Further, since the airbag 30 is attached to the outer bag 40E around the inflator attachment hole 43, the airbag 30 can be stably inflated and deployed with the periphery of the inflator 22 as a fixed portion.

  In the example shown in FIG. 39, since the airbag 30 is directly fixed to the outer bag 40E via the circular stitching portion 70, the inflating and deploying force of the airbag 30 is applied to the circular stitching portion 70. When acting, the force is distributed in the extending direction with respect to the circular suture portion 70. For this reason, it becomes difficult for the outer bag 40E and the airbag 30 to come off.

  In the example shown in FIG. 40, since the outer bag 40E and the airbag 30 are sewn via the square stitching portion 72, the bottom 40a of the outer bag 40E can easily maintain the square shape. For this reason, it becomes easy for the outer bag 40E to maintain a rectangular parallelepiped box shape.

  Further, the airbag device 20 </ b> E may be connected and fixed to a lid side peripheral wall portion standing on the outer periphery of the lid 12. In this case, as in the modification shown in FIG. 41, the lid panel 110B incorporated in the instrument panel 110 and the airbag device 120 corresponding to the airbag device 20E may be connected and fixed.

  That is, the instrument panel 110 includes an instrument panel main body 110A that is fixed to the vehicle body, and a lid panel 110B that is attached to the instrument panel main body 110A. An opening (here, a substantially rectangular opening) is formed in the instrument panel body 110A, and the lid panel 110B is fitted and fixed in the opening. The lid panel 110B is fixed by, for example, engaging an engaging portion 110Ba formed on the lid panel 110B with an engaged portion (not shown) formed on the instrument panel main body 110A.

  The lid panel 110B is formed of resin or the like, and is used as an airbag built-in panel in which the airbag device 120 is incorporated. A lid 112 similar to the lid 12 is formed on the lid panel 110B. A tear line 13 is formed around the lid 112.

  On the inner surface of the lid panel 110 </ b> B, a lid-side peripheral wall portion 114 that is erected around the outer periphery of the lid 112 is formed. The lid side peripheral wall portion 114 surrounds the lid 112 over the entire outer periphery. However, the lid-side peripheral wall portion 114 is inclined with respect to the main surface of the lid panel 110B, and extends so as to face substantially downward when the lid panel 110B is attached to the instrument panel main body 110A. Further, in this state, the lower end portion of the side wall portion 114A (the left side in FIG. 41) located on the front side of the lid-side peripheral wall portion 114 is the other side wall portion 114B (in FIG. 41) located on the rear side of the vehicle. It is located above the lower end of (right side). Further, mounting holes 114Ah and 114Bh for connecting belts 170 and 172, which will be described later, are formed in the side wall portions 114A and 114B.

  The airbag device 120 includes an inflator 22, an airbag 30, and an outer bag 40E, and further includes belts 170 and 172.

  FIG. 42 is a perspective view showing the outer bag 40E and the belts 170 and 172 in the middle of assembly. As shown in FIGS. 41 and 42, the belts 170 and 172 are members that are connected to the inflator 22 and the lid-side peripheral wall 114 and hold the inflator 22 at a fixed position inside the lid 112. Here, one end portions of the belts 170 and 172 are joined to the inflator 22, and the other end portions of the belts 170 and 172 are joined to the peripheral wall portion 40b through attachment holes 114Ah and 114Bh formed in the lid-side peripheral wall portion 114. An example will be described.

  That is, a pair of belts 170 are joined to one side surface portion of the peripheral wall portion 40b of the outer bag 40E, and a pair of other side surface portions facing the one side surface portion of the peripheral wall portion 40b of the outer bag 40E are paired. The belt 172 is joined.

  The pair of belts 170 are integrated at the base end portion, separated at a middle portion in the longitudinal direction through a hole (in this case, a shape gradually narrowing from the base end side toward the tip end side), and cut at the tip end portion. It is set as the structure isolate | separated by etc. Further, the tip portions of the pair of belts 170 have an arcuate concave edge corresponding to the outer peripheral shape of the inflator 22, and are formed around the gas inlet of the airbag 30 on the outer periphery of the concave edge. Mounting holes are formed at locations corresponding to the mounting holes. The base end portions of the pair of belts 170 are joined to the outer surface of one side surface portion of the peripheral wall portion 40b by sewing or the like, and in the state before the attachment to the lid side peripheral wall portion 114 (see FIG. 42), the peripheral wall portion 40b. It extends upward from one side surface portion.

  The pair of belts 172 has substantially the same configuration as the pair of belts 170 except that the length dimension is different from that of the pair of belts 170. The base end portions of the pair of belts 172 are joined to the outer surface of the other side surface portion of the peripheral wall portion 40b by sewing or the like, and in the state before the attachment to the lid side peripheral wall portion 114 (see FIG. 42), It extends upward from the other side portion.

  A configuration for attaching the integrated structure of the inflator 22, the airbag 30, and the outer bag 40E to the lid panel 110B will be described.

  First, while folding the pair of belts 170 and the pair of belts 172 from the inside through the mounting holes 114Ah and 114Bh of the side wall portions 114A and 114B of the lid side peripheral wall portion 114, the folded airbag 30 and the outer bag covering the airbag 30 are covered. 40E is pushed into the lid-side peripheral wall 114.

  Thereafter, the pair of belts 170 and the pair of belts 172 are folded back from the outer surface of the lid-side peripheral wall 114 toward the periphery of the inflator 22. Then, the screw portion 25 of the inflator 22 is passed through the attachment holes on the distal end side of the pair of belts 170 and the pair of belts 172. Then, the nut 29 is screwed and fastened to the screw portion 25 in a state where the fixing bracket 28 is superimposed on the flange portion 24 of the inflator 22. Until this state is reached, the nut 29 may be loosely fastened to the threaded portion 25, and the nut 29 may be removed as necessary. As a result, the inflator 22 is held at a position away from the lid 112 by a certain distance.

  As described above, when the lid panel 110B to which the inflator 22, the airbag 30, and the outer bag 40E are attached is fitted into the opening of the instrument panel main body 110A from the outside, the airbag device 120 is installed in the instrument panel body 110A. It will be incorporated into the ment panel 110. At this time, since the rigid fixing structure between the airbag device 120 and the vehicle body side member 18 is not necessary, the airbag device 120 can be assembled relatively easily.

  43 to 45 are explanatory views showing the deployment operation of the airbag device 120. FIG. In these drawings, for convenience of explanation, the side wall 114A and the side wall 114B of the lid side peripheral wall 114 are simplified, for example, at substantially the same height.

  First, in the normal state before the deployment operation, the folded airbag 30 is disposed between the lid 112 and the inflator 22, as shown in FIG. In this state, the lid-side peripheral wall portion 114 surrounds the upper end portion of the folded airbag 30 from four sides, and the ceiling piece 55 covers the folded airbag 30 from above. Further, the peripheral wall portion 40b of the outer bag 40E surrounds the folded airbag 30 from the surrounding four sides.

  In this state, when the gas generated from the inflator 22 is introduced into the airbag 30, the airbag 30 is in a space surrounded by the lid 112, the lid side peripheral wall portion 114, and the inflator 22 as shown in FIG. 44. The expansion starts.

  At this time, in the main inflation and deployment direction of the airbag 30 (the direction from the inflator 22 toward the lid 112), the inflator 22 is held at a certain distance from the lid 112 by the belts 170 and 172. The expansion and deployment force in the protruding direction of the bag 30 acts as a force for the lid 112 to open. Moreover, the force that the airbag 30 tries to inflate and deploy also acts as a force that breaks the ceiling piece 55 at the breaking portion 55a.

  At this time, in the same manner as described above, the airbag 30 tends to inflate and deploy in the radial direction toward the periphery around the main inflation and deployment direction (direction from the inflator 22 toward the lid 112). In the portion where the lid-side peripheral wall portion 114 is present, the airbag 30 to be inflated and deployed is pressed against the inner surface of the lid-side peripheral wall portion 114, so that the air bag 30 and the lid-side peripheral wall portion 114 are It is hold | maintained so that the surrounding wall part 40b may be pinched | interposed. Further, a portion of the peripheral wall portion 40b interposed between the lid-side peripheral wall portion 114 and the inflator 22 receives the entire vicinity of the inflator 22 in the airbag 30 to be inflated and deployed. The airbag 30 can be prevented from inflating and deploying outward so as to spread in the radial direction between the lid-side peripheral wall portion 114 and the inflator 22.

  When the ceiling piece 55 is broken and the lid 112 is split open, the airbag 30 is inflated and deployed outward through the opening of the instrument panel 110 as shown in FIG. Even in this state, the peripheral wall 40b is partially overlapped with the lid-side peripheral wall 114 by the configuration in which the peripheral wall 40b is sandwiched between the airbag 30 and the lid-side peripheral wall 114. Thus, as described above, the portion of the peripheral wall portion 40b that is interposed between the lid-side peripheral wall portion 114 and the inflator 22 receives the entire vicinity of the inflator 22 in the airbag 30 that is inflated and deployed. Thus, the airbag 30 is prevented from spreading in the radial direction between the lid-side peripheral wall 114 and the inflator 22.

  The airbag 30 is inflated and deployed between the instrument panel 110 and the passenger seat occupant to receive the passenger occupant and absorb the impact.

  According to the airbag device 120 configured as described above, the airbag 30 is prevented from spreading in the radial direction between the lid-side peripheral wall portion 114 and the inflator 22 as much as possible, as in the above embodiment. The effect that it can be reduced in weight can be acquired.

  In addition, since the inflator 22 is held at a fixed position inside the lid 112 mainly by the belts 170 and 172, the holding configuration of the inflator 22 can be further reduced in weight.

  In addition, since the base end portions of the belts 170 and 172 are joined to the peripheral wall portion 40b through the mounting holes 114Ah and 114Bh, the peripheral wall portion 40b is located between the airbag 30 and the lid-side peripheral wall portion 114 during inflation and deployment. It becomes difficult to pull out from. Thereby, the surrounding wall part 40b is more reliably maintained between the lid side surrounding wall part 114 and the inflator 22, and the spread of the airbag 30 in the radial direction at the intermediate part can be more reliably suppressed.

  Further, since the inflator 22 is fixed at a fixed position inside the lid 112 by the belts 170 and 172, the fixing structure between the inflator 22 and the vehicle body side member can be simplified or omitted. Thereby, for example, since the lid panel 110B to which the inflator 22, the airbag 30 and the like are attached may be attached to the instrument panel main body 110A, the assembly work of the airbag device 120 to the instrument panel 110 is easy. It becomes.

  The main function of the belts 170 and 172 itself is to keep the position of the inflator 22 relative to the lid 112 constant. For this reason, the belts 170 and 172 do not exist continuously around the entire outer periphery of the airbag 30, but intermittently around at least two locations (here, four locations around the airbag 30). ).

  Moreover, the structure which connects a belt to a lid side surrounding wall part is not restricted to the said example.

  For example, as shown in FIG. 46, the longitudinal intermediate portions of the belts 270 and 272 are passed through the mounting holes 114Ah and 114Bh formed in the side wall portions 114A and 114B of the lid side peripheral wall portion 114, and both end portions of the belts 270 and 272 May be configured to be joined to the inflator 22.

  Even in this case, as shown in FIGS. 47 and 48, the belts 270 and 272 hold the inflator 22 at a fixed position from the lid 112 when the airbag 30 is inflated and deployed, as in the above case. Therefore, as in the case described above, there is an effect that the weight of the airbag 30 can be reduced as much as possible while suppressing the airbag 30 from spreading in the radial direction between the lid-side peripheral wall 114 and the inflator 22. be able to.

  Further, since both end portions of the belts 270 and 272 may be joined to the inflator 22, the work of joining the outer bag by stitching or the like becomes unnecessary, and the joining structure can be simplified.

  For example, as shown in FIG. 49, the base end portions of the belts 370 and 372 are joined to the inflator 22, and the other end portions of the belts 370 and 372 are formed on the side wall portions 114A and 114B via the hooks 374. The fixing holes 114Ah and 114Bh may be locked and fixed. As the hook 374, for example, a member obtained by bending a metal plate material into a substantially U shape can be used. As a joining structure between the other end portions of the belts 370 and 372 and the hook 374, a sandwiching structure by sewing, caulking, or the like is used. A configuration using other clip members or the like can be employed. Here, the hook 374 is locked to the mounting holes 114Ah and 114Bh from the outer surfaces of the side wall portions 114A and 114B.

  Even in this modification, as shown in FIGS. 50 and 51, the belts 370 and 372 hold the inflator 22 at a fixed position from the lid 112 when the airbag 30 is inflated and deployed, as in the above case. Therefore, as in the case described above, there is an effect that the weight of the airbag 30 can be reduced as much as possible while suppressing the airbag 30 from spreading in the radial direction between the lid-side peripheral wall 114 and the inflator 22. be able to.

  Further, the hooks 374 at both ends of the belts 370 and 372 can be relatively easily locked and joined so as to be hooked on the inflator 22 in the mounting holes 114Ah and 114Bh formed in the side walls 114A and 114B.

  Further, for example, if a belt length adjusting mechanism is incorporated in the belts 370 and 372, the hooks 374 can be easily hooked in the mounting holes 114Ah and 114Bh while the belts 370 and 372 are relatively long. If the lengths of the belts 370 and 372 are shortened, the inflator 22 can be held at a fixed position.

  Further, when the airbag 30 is inflated, the airbag 30 and the lid side peripheral wall portion 114 are inflated outward, so that the belts 370 and 372 are inflated so as to be bent outward, so that the mounting holes 114Ah and 114Bh are removed. The base end portion of the hook 374 locked from the side is displaced outward, and the tip end portion of the hook 374 strongly bites into the inner surface of the lid side peripheral wall portion 114 at the peripheral edge portions of the mounting holes 114Ah and 114Bh. This more reliably prevents the hook 374 from falling off.

{Fourth embodiment}
An airbag device 220 according to the fourth embodiment will be described. FIG. 52 is a perspective view showing an airbag device 220 according to the present embodiment. In the description of the present embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The airbag device 220 includes an inflator 22, an airbag 30, and an outer bag 240.

  The inflator 22 and the airbag 30 have the same configuration as that described in the first embodiment.

  The outer bag 240 is configured by sewing a foldable and joinable flexible sheet-like member 242 (cloth or resin sheet or the like). Joining is preferably performed by sewing, and here also will be described with an example of sewing, but this is not essential.

  The airbag 30 and the outer bag 240 are attached to the inflator 22 in the same manner as in the first embodiment. That is, the screw portion 25 protruding from the collar portion 24 (here, formed in a square plate shape) of the inflator 22 is fixed to the fixing holes 243a and 244a at the peripheral portions of the inflator mounting recesses 243 and 244 of the outer bag 240 (see FIG. 53-58) and the fixing hole formed in the peripheral part of the gas inlet of the airbag 30. Further, the fixing bracket 28 is overlapped with the collar portion 24 from the outside of the outer bag 240. A hole corresponding to the screw portion 25 is formed in the fixing bracket 28, and a nut is screwed and fastened to the screw portion 25 protruding from the hole. Thereby, between the flange part 24 and the fixing bracket 28, the peripheral part of the gas introduction port in the airbag 30 and the peripheral part of the inflator mounting recesses 243 and 244 in the outer bag 240 are sandwiched and fixed. Thereby, the airbag 30 and the inflator 22 are attached and fixed to the outer bag 240.

  The outer bag 240 is formed in a bag shape having an opening 242h by folding and joining each side edge portion of the sheet-like member 242 at the middle portion in the longitudinal direction. In addition, the sheet-like member 242 is formed with a breaking portion 241 that can be broken when the airbag 30 is inflated and deployed. As will be described later in detail, the outer bag 240 covers the airbag 30 with the inflator 22 attached to the peripheral edge of the opening 242h in the outer bag 240. In this state, the airbag 30 can be inflated and deployed outward of the outer bag 240 by breaking the breaking portion 241.

  The outer bag 240 will be described more specifically.

  In manufacturing the outer bag 240, first, a sheet-like member 242 shown in FIGS. 53 and 54 is prepared. 53 is a plan development view of the sheet-like member 242, and FIG. 54 is a diagram showing a stitching line 242a and a folding line 242b in the development view of the sheet-like member 242 shown in FIG. In FIG. 54, the stitching line 242a is indicated by a dotted line, and the folding line 242b is indicated by a one-dot chain line.

  The sheet-like member 242 is formed in a rectangular shape and has a size enough to cover the airbag 30 folded in a bag-like state as will be described later. At an intermediate portion of the sheet-like member 242 (here, the central portion in the vertical direction in FIGS. 53 and 54), a fracture portion 241 is formed along the direction connecting both side edges of the sheet-like member 242. The breaking portion 241 is formed by partially cutting the sheet-like member 242 along a straight line. Then, in a state where the outer bag 240 covers the airbag 30, the rupture portion 241 is arranged at a substantially central portion of the upper portion of the airbag 30.

  In addition, a semicircular arc-shaped inflator mounting recess 243 is formed at the center of each of the pair of opposite sides on one side of the sheet-like member 242, and a fixing hole 243a (here, 2) is formed in the peripheral portion of the inflator mounting recess 243. Is formed.

  Further, on one set of opposite sides of the sheet-like member 242, 1/4 arc-shaped inflator mounting recesses 244 are formed at the positions of both ends of each side and at the outer ends of both ends of each inflator mounting recess 243. Has been. In addition, a fixing hole 244a is formed in the peripheral portion of each inflator mounting recess 244.

  As shown in FIGS. 53 to 55, the sheet-like member 242 is folded in half at the center in the vertical direction, and both side edges thereof are stitched along the stitching line 242a. That is, each of the side edge portions of the sheet-like member 242 is folded and stitched at the middle portion in the longitudinal direction.

  Note that, in the final form of the outer bag 240, the ceiling portion is in a state of being flattened as will be described later, and therefore the bi-fold line is not an actually folded portion. In addition, the fold line is a line that coincides with the fracture portion 241. Therefore, the fracture | rupture part 241 is provided between the folding | turning parts of a both-sides edge part of the sheet-like member 242. FIG.

  Further, it is not essential that the bi-fold line divides the sheet-like member 242 into two equal parts, and the bi-fold line may be provided at a position shifted from the center of the sheet-like member 242.

  By stitching the sheet-like member 242 as described above, a bag-like outer bag 240 is formed which opens at the opening 242h and has a rupture portion 241 formed at a position facing the opening 242h (bag-shaped bottom). Is done. The outer bag 240 may be entirely or partially overlapped with a plurality of cloths or the like according to the strength needs. In addition, there may be a supplemental stitching portion or the like that is not related to the formation of the bag. The height of the outer bag 240 can be adjusted by appropriately adjusting the size of the sheet-like member 242 and the like.

  The outer bag 240 is preferably folded so as to form a rectangular parallelepiped box as shown in FIGS. Here, the outer bag 240 has a ceiling part 240d that faces the inflator 22, and a peripheral wall part 240b that surrounds one main surface side of the ceiling part 240d in a substantially square ring shape.

  Further, when the sheet-like member 242 is folded as described above, a conical bag-like portion is left on both sides of the ceiling portion 240d. This bag-like portion is folded into a triangular shape and formed at the ear portion 240c. The ear portion 240c may be left extending to the outside of the outer bag 240, or may be folded back toward the peripheral wall portion 240b or the ceiling portion 240d. The ear portion 240c may be folded into the outer bag 240. However, it is not essential that the outer bag 240 has a rectangular parallelepiped box shape, and may have an external shape such as a cylindrical shape or a spherical shape.

  Further, in the final state where the outer bag 240 is attached to the inflator 22, the opening peripheral edge portion of the outer bag 240 is folded so as to form a rectangular parallelepiped box-shaped bottom portion 240a. This will be described subsequently.

  That is, the airbag 30 and the inflator 22 are attached and fixed to the outer bag 240 as follows.

  As shown in FIGS. 56 and 57, the airbag 30 and the inflator 22 are disposed in the outer bag 240. In this state, the flange portion 24 of the inflator 22 is disposed in the airbag 30, and the screw portion 25 protruding from the flange portion 24 protrudes out of the airbag 30 through the fixing hole of the airbag 30. Yes. 56 to 58, only the collar portion 24 of the inflator 22 is illustrated.

  Next, the peripheral edge portion of the opening 242 h in the outer bag 240 is folded to the inner peripheral side with at least a part thereof being overlapped, and is overlapped with the outer portion of the collar portion 24. Here, the outer bag 240 is folded so as to form a rectangular parallelepiped box, and each portion corresponding to the four side surfaces of the peripheral wall 240b is folded inward so as to form a rectangular bottom 240a. .

  As described above, when the peripheral portion of the opening 242h in the outer bag 240 is folded, four portions (outer portions of the corner) corresponding to the corners of the bottom portion 240a in the peripheral portion of the opening 242h of the outer bag 240 are excessive. A portion 245 is formed (see FIGS. 54 and 58). Therefore, each surplus portion 245 is folded (here, folded in a triangular shape) and overlapped with other portions of the bottom portion 240a.

  Then, the two inflator mounting recesses 243 and the eight inflator mounting recesses 244 are connected so as to form one circle on which the inflator 22 can be disposed.

  In addition, the surplus portion 245 is overlaid on each of the fixing hole 243a portions of the inflator mounting recesses 243, respectively. Each surplus portion 245 includes a portion where a portion where the 1/4 arc-shaped inflator mounting recess 244 is formed is overlapped in the periphery of the opening 242 h of the outer bag 240. And each fixing hole 243a part of each inflator attachment recessed part 243 overlaps with the fixing hole 244a part contained in the said excess part 245 doubly. The screw portion 25 protruding from the collar portion 24 protrudes to the outside through the fixing hole 243a and the two fixing holes 244a.

  As described above, the airbag 30 and the inflator 22 are attached and fixed to the outer bag 240 using the screw portion 25 protruding from the collar portion 24, the fixing bracket 28, and the nut.

  The airbag device 220 exhibits a deployment operation similar to that of the airbag device 20C of the third embodiment, which covers the folded airbag 30 above.

  According to the airbag apparatus 220 configured as described above, the bag-like outer bag 240 is formed by folding and joining the both side edge portions of the sheet-like member 242 at the respective intermediate portions in the longitudinal direction. Yes. The outer bag 240 covers the folded airbag 30 in a state where it can be inflated and deployed while being attached to and drooped from the inflator 22. For this reason, the structure which covers the folded airbag 30 with the sheet-like member 242 can be obtained by simpler joining work.

  In addition, the sheet-like member 242 is provided with a breaking portion 241 and covers the airbag 30 in which the outer bag 240 is folded with the inflator attached to the peripheral portion of the opening 242h of the outer bag 240. Since the airbag 30 can be inflated and deployed by breaking the breaking portion 241, a configuration that covers the entire airbag 30 can be easily realized. Thereby, the folded state of the airbag 30 can be maintained more reliably.

  Moreover, since the fracture | rupture part 241 is provided between the folding | turning parts of a both-sides edge part in the sheet-like member 242, it faces toward the side facing the inflator 22 attached to the peripheral part of the opening 242h of the outer bag 240. The airbag 30 can be inflated and deployed smoothly.

  Moreover, since the outer bag 240 is folded so as to form a rectangular parallelepiped box shape, the folded airbag 30 and the outer bag 240 covering the airbag 30 can have a rectangular parallelepiped appearance. As a result, it is easy to stabilize the shapes of the folded airbag 30 and outer bag 240 and facilitate the housing operation.

  Further, the peripheral edge portion of the opening 242h of the outer bag 240 is folded inward with at least a portion thereof being overlapped, and the peripheral edge portion of the opening 242h of the outer bag 240 is at least partially interposed via the overlapping portion. Since it is fixed to the inflator 22, the outer bag 240 and the inflator 22 can be firmly fixed.

  Further, the peripheral wall portion 240b of the opening 242h of the outer bag 240 is folded inward so as to form a rectangular bottom portion 240a, and the peripheral wall portion 240b of the opening 242h is overlapped at a position corresponding to the corner of the bottom portion 240a. Therefore, the outer bag 240 and the inflator 22 can be firmly attached and fixed while forming the bottom 240a in a square shape.

  In the present embodiment, the outer bag 240 may be directly attached to the airbag 30 as in the modification shown in FIG. 39 and the like.

  In the example shown in FIG. 59, the outer bag 240 is directly attached to the airbag 30 via the arcuate stitched portion 270 on the outer periphery of one inflator attachment recess 243.

  The outer bag 240 may be sewn to the airbag 30 either before or after the airbag 30 is sewn into a bag shape, or may be performed before or after the outer bag 240 is sewn into a bag shape.

  Thus, as in the modification shown in FIGS. 39 and 40, the airbag 30 (or a sheet-like member for molding) and the outer bag 240 (or the molding thereof) are in the middle of manufacturing before the inflator 22 is attached. Can be handled as an integral component, which is convenient in terms of work process.

  In particular, since the portion that constitutes the bottom portion 240a of the outer bag 240 is attached to the airbag, the processing of the outer bag 240 after attachment is easy.

{Modifications}
In the above-described embodiment, the example in which the airbag device is incorporated in the instrument panel for the passenger seat has been described, but the application target is not limited thereto. For example, the present invention can be applied to various airbags that are incorporated into some attachment panel such as a driver's seat, a side airbag, etc., and that are inflated by opening a lid.

  Moreover, each structure demonstrated by the said embodiment and each modification can be suitably combined unless it mutually contradicts.

  For example, the auxiliary wrap member 60 may be used in the first embodiment, the second embodiment, and the fourth embodiment. Moreover, the sheet-like member for forming an outer bag in 1st Embodiment or 2nd Embodiment may be sewn on the airbag. Moreover, the outer bag in 1st Embodiment, 2nd Embodiment, or 3rd Embodiment may be attached and fixed to the lid panel via the belt as demonstrated in the modification of 3rd Embodiment.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

Claims (23)

An airbag device incorporated into an airbag assembly panel having a lid that can be split open,
An inflator capable of generating gas inside the lid;
An airbag that is folded into a state that can be disposed inside the lid and is inflatable and deployable in a bag shape by a gas introduced from the inflator;
Each of the side edge portions of the sheet-like member is folded and joined at the respective longitudinal intermediate portions to form a bag having an opening, and the folded airbag is attached to the inflator. An outer bag that covers the inflatable state,
An airbag device comprising: The airbag device according to claim 1,
The sheet-like member is provided with a breakable portion that can be broken when the airbag is inflated and deployed.
The outer bag covers the folded airbag in a state in which the inflator is attached to a peripheral portion of the opening in the outer bag, in a state where the broken portion is broken and can be inflated and deployed. Bag device. The airbag device according to claim 2,
The airbag apparatus by which the said fracture | rupture part is provided between the folding | turning parts of the said both-sides edge part among the said sheet-like members. The airbag device according to claim 2 or 3, wherein
An airbag device in which the outer bag is folded so as to form a rectangular parallelepiped box. The airbag device according to any one of claims 1 to 4,
The peripheral edge of the opening of the outer bag is folded inward in a state where at least a part thereof is overlapped,
An airbag device in which a peripheral edge portion of the opening of the outer bag is fixed to the inflator via the at least part of the overlapping portion. The airbag device according to claim 5,
The peripheral edge of the opening of the outer bag is folded inward so as to form a rectangular bottom,
The airbag apparatus with which the peripheral part of the said opening of the said outer bag is overlaid in the location corresponding to the corner | angular of the said bottom part. The airbag device according to any one of claims 1 to 6,
An airbag device in which the outer bag is attached to the airbag. The airbag device according to claim 2,
An inflator mounting hole is formed in the sheet-like member,
The outer bag is formed in a bag shape having an opening, and covers the folded airbag in a state in which it can be inflated and deployed through the opening while the inflator is attached to a peripheral portion of the inflator attachment hole. Air bag device. The airbag device according to claim 8, wherein
The airbag apparatus with which the said inflator attachment hole is formed between the folding | turning parts of the said both-sides edge part among the said sheet-like members. The airbag device according to claim 8 or 9, wherein
An airbag device in which the outer bag is folded so as to form a rectangular parallelepiped box. It is an airbag apparatus as described in any one of Claims 8-10,
The airbag apparatus by which the extension piece which can be pinched | interposed between the said airbag in expansion | deployment and the opening outer periphery part of the said lid is provided in the peripheral part surrounding the said opening among the said outer bags. It is an airbag apparatus as described in any one of Claims 8-11, Comprising:
A ceiling piece that covers the opening and is provided with a breakable portion that can be broken when the airbag is inflated and deployed is extended to a peripheral portion that surrounds the opening of the outer bag, and the ceiling piece has an inflator mounting hole. An airbag device provided with an inflator mounting extension piece that extends so as to reach and is attached to the inflator together with a peripheral portion of the inflator mounting hole. It is an airbag apparatus as described in any one of Claims 8-12,
An airbag device in which the outer bag is attached to the airbag. The airbag device according to claim 13,
An airbag device in which the outer bag is attached to the airbag around the inflator attachment hole. The airbag device according to claim 14,
The airbag apparatus with which the said outer bag is attached to the said airbag via the circular junction part surrounding the said inflator attachment hole. The airbag device according to claim 14,
The outer bag is folded to form a rectangular parallelepiped box,
The airbag apparatus with which the said outer bag is attached to the said airbag via the square-shaped joining part along four sides around the surface in which the said inflator attachment hole was formed among the said outer bags. It is an airbag apparatus as described in any one of Claims 1-16, Comprising:
An airbag device in which a part of the outer bag is disposed so as to be sandwiched between the airbag being inflated and deployed and a lid side peripheral wall portion standing on the outer periphery of the lid. The airbag device according to any one of claims 1 to 17,
An inflator fixing member fixed to the inflator and fixable to the vehicle body side member;
An airbag device in which the inflator is fixed to a fixed position inside the lid by fixing the inflator fixing member to the vehicle body side member. It is an airbag apparatus as described in any one of Claims 1-18, Comprising:
An airbag device further comprising an auxiliary wrap member that covers the airbag folded inside the outer bag and that can be broken when the airbag is inflated and deployed. The airbag device according to any one of claims 1 to 19,
An airbag device further comprising a belt that is connected to the inflator and a lid-side peripheral wall portion standing on the outer periphery of the lid and holds the inflator at a fixed position inside the lid. The airbag device according to claim 20, wherein
An airbag device in which one end of the belt is joined to an inflator, and the other end of the belt is joined to the outer bag through an attachment hole formed in the lid side peripheral wall. The airbag device according to claim 20, wherein
An airbag device in which a longitudinal intermediate portion of the belt is passed through an attachment hole formed in the lid side peripheral wall portion, and both end portions of the belt are joined to the inflator. The airbag device according to claim 20, wherein
An airbag device in which one end portion of the belt is joined to the inflator, and the other end portion of the belt is locked and fixed to the lid side peripheral wall portion via a hook portion.

Images