JP2010018099A - Front passenger seat airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress degradation of a deployment performance of an airbag caused by a partial leakage from a portion between the airbag cover and a case in a front passenger seat airbag device in which side-wall parts of the case and an instrument panel are connected with one another by fitting brackets. <P>SOLUTION: The case 25 of the front passenger seat airbag device 12 includes a bottom 26 arranged in a substantially horizontal state under the air-bag, and a pair of side-wall parts 29 that nip the airbag from at least both sides in a body width direction serving as wall parts projecting upward from the bottom 26. A connection wall part 53 of an airbag cover 50 has a square tubular shape, and covers the airbag and the both side-wall parts 29 of the case 25 from the outside. Each of the fitting brackets 60 extends from a front end of the corresponding side-wall part 29 to the outside of the connection wall part 53 to be attached to an attaching boss 13 of the instrument panel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an airbag device for a passenger seat that inflates and deploys an airbag in front of a passenger in a passenger seat and protects the passenger from impact.

  For example, a passenger seat airbag device 80 shown in FIG. 12 is known as one means for protecting passengers in a passenger seat when an impact is applied to the vehicle from the front. The passenger seat airbag device 80 includes a folded airbag 81, an inflator 82 that supplies inflation gas to the airbag 81, a case 83 that holds the airbag 81 and the inflator 82, and an airbag 81. Is provided with a retainer 84 for attaching to the case 83 and an airbag cover 85 covering the airbag 81 and the like.

  The case 83 is provided at a bottom portion 86 disposed in a substantially horizontal state below the airbag 81, a pair of side wall portions 87 provided at a side edge portion of the bottom portion 86, and a front edge portion of the bottom portion 86. A front wall portion 88 and a rear wall portion 89 provided at the rear edge portion of the bottom portion 86 are provided, and the airbag 81 is surrounded by the side wall portions 87, the front wall portion 88 and the rear wall portion 89. A plurality of locking claws 90 are fixed to the outer wall surfaces of the front wall portion 88 and the rear wall portion 89, respectively.

  The airbag cover 85 includes a door portion 91 positioned on the upper side of the airbag 81 and a rectangular tubular connecting wall portion 92 that protrudes downward from the peripheral edge portion of the door portion 91. The connecting wall 92 covers the airbag 81 and both side walls 87, the front wall 88, and the rear wall 89 of the case 83 from the outside. A plurality of locking holes 94 are formed in each of the wall portions 93 opposed to each other in the front-rear direction in the connecting wall portion 92, and a locking claw portion 90 corresponding to this is inserted and locked. The connecting wall 92 is held.

  As another type of case, a passenger seat airbag device in which the front wall portion 88 and the rear wall portion 89 are omitted from the case 83 described above has also been proposed (see, for example, Patent Document 1 and Patent Document 2). According to this type of airbag device for a passenger seat, the weight can be reduced and the structure can be simplified, and the following effects can also be expected. That is, the side wall portion can be deformed outward in the vehicle width direction by the airbag that is inflated and deployed, and can be brought into contact with the connecting wall portion of the airbag cover. The above deformation includes the following two modes. One is a phenomenon in which the side wall portion tilts outward in the vehicle width direction with the boundary portion between the side wall portion and the bottom portion as a fulcrum. The other is a phenomenon in which the side wall portion is deformed into an arcuate shape (distortion) so that the center portion in the front-rear direction of the side wall portion swells most outward in the vehicle width direction. And if a side wall part and a connection wall part contact | abut with the said deformation | transformation of a side wall part, it is because a part of airbag which inflate-deploys leaks outside from the site | part between an airbag cover and a case. A reduction in the deployment performance of the airbag is suppressed.

Further, in the passenger airbag device, a fitting bracket is used to connect the case and the instrument panel. In Patent Document 1 and Patent Document 2, the description of the fitting bracket is omitted. However, in Patent Document 3, for example, the fitting bracket extends from the central portion in the front-rear direction of the side wall portion, and is outside the airbag cover. A mode of being attached to the instrument panel is described.
Japanese Patent Laid-Open No. 02-256541 Japanese Utility Model Publication No. 06-008117 JP 2000-301996 A

  However, if the fitting bracket is extended from the center portion in the front-rear direction of the side wall portion as described in Patent Literature 3 in an attempt to provide the fitting bracket in Patent Document 1 and Patent Document 2, the following problem occurs. . That is, the rigidity of the central portion in the front-rear direction is increased in the side wall portion by fixing the fitting bracket. As a result, the phenomenon that the side wall portion described above is inclined and the phenomenon that it is deformed into a bow shape are less likely to occur, and the side wall portion and the connecting wall portion are brought into contact with each other, so There is a risk that the effect of suppressing leakage to the outside cannot be obtained sufficiently.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an airbag device in a passenger seat airbag device in which a side wall portion of a case and an instrument panel are connected by a fitting bracket. It is in suppressing the deployment performance fall of the airbag by a part leaking out from the site | part between an airbag cover and a case.

  In order to achieve the above object, the invention according to claim 1 is an airbag device for a passenger seat mounted on a part of an instrument panel in front of the passenger seat, and stores the airbag in a folded state. A pair of bottom portions disposed in a substantially horizontal state on the lower side of the airbag, and as a wall portion protruding upward from the bottom portion, a pair of sandwiching the airbag from at least both sides in the vehicle width direction A case provided with a side wall, a door portion disposed on the upper side of the airbag, and a cylindrical connecting wall portion projecting downward from the periphery of the door portion, the door portion and the connecting wall portion, An airbag cover that covers the side walls of the airbag and the case from the outside, and extends from a front end portion or a rear end portion of each side wall portion in the case, and goes out of the connecting wall portion to And summarized in that and a pair of fitting brackets attached to Nsu torr instrument panel.

  Here, the pair of side wall portions that protrude upward from the bottom portion of the case and sandwich the airbag from at least both sides in the vehicle width direction are provided with a fitting bracket, so that the rigidity of the boundary portion with the fitting bracket is increased in the side wall portion. . In the first aspect of the present invention, since each fitting bracket extends from the front end or rear end of each side wall, the rigidity of the front end or rear end is increased. Therefore, in the center portion in the front-rear direction of each side wall portion, there is little influence of increase in rigidity due to the provision of the fitting bracket.

  Therefore, each side wall part can be deformed in an intended manner by the airbag that is inflated and deployed. Specifically, with the boundary portion between the side wall portion and the bottom portion as a fulcrum, the side wall portion is inclined outward in the vehicle width direction, or the center portion in the front-rear direction of the side wall portion is bulged outwardly in the vehicle width direction. The side wall portion can be deformed into a bow shape. In particular, the front end portion or the rear end portion of the side wall portion is highly rigid and difficult to deform, so that the side wall portion can be more effectively deformed into a bow shape. Moreover, if it is a box-type case, the rigidity of the front end part or the rear end part of the side wall part is obtained due to the side wall part and the front wall part or the rear wall part being continuously connected. Instead, the rigidity of the front end portion or the rear end portion can be supplemented by the presence of the fitting bracket. As a result, the side wall portion is deformed into a bow shape such that a central portion in the front-rear direction swells outward. And by making such a deformation | transformation, a side wall part is contact | abutted to a connection wall part, and the expansion | deployment performance fall of the airbag by a part of the airbag which inflate-deploys leaks from the site | part between an airbag cover and a case is suppressed. be able to.

  In addition, each said fitting bracket may be formed by a member different from the said case, and may be joined to the front-end part or the rear-end part of the said side wall part, according to the invention of Claim 2. In this case, examples of the joining means include welding, adhesion, riveting and the like.

  Further, according to the invention described in claim 3, each of the fitting brackets may be integrally formed with the same member as the case, and may be connected to the case at a front end portion or a rear end portion of the side wall portion. In this case, the airbag device for the passenger seat is lighter than when the fitting bracket is formed by a member different from the case. If it is formed by a separate member, the fitting bracket may need to overlap with the case for fixing, or another member (welding material, adhesive, rivet, etc.) for fixing may be required. On the other hand, when they are integrally formed by the same member, such an overlapping portion or a separate member for fixing becomes unnecessary.

  The invention according to claim 4 is the invention according to claim 3, wherein each of the fitting brackets has two bent portions for forming a connection portion with respect to the side wall portion and an attachment portion with respect to the instrument panel. The gist is that each of the fitting brackets is bent at each of the bent portions.

  As described above, bending each fitting bracket at two or more bent portions greatly increases the degree of freedom of the shape of the fitting bracket as compared with a case where the fitting bracket is bent at one location. Therefore, in each fitting bracket, the connection part with respect to a side wall part and the attachment part with respect to an instrument panel can be formed reliably.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the side wall portion protruding upward from the bottom portion of the case includes only the pair of side wall portions. The gist.

  According to the above configuration, compared to the case where the rectangular box-shaped wall portion protrudes upward from the bottom portion, the front wall portion and the rear wall portion that protrude upward from the bottom portion and sandwich the airbag from the front-rear direction are not provided, The case becomes lighter. Further, each side wall portion is in a so-called cantilever support state supported by the bottom portion only at its lower edge portion, and thus is easily deformed by an inflating and deploying airbag.

  According to the airbag device for a passenger seat of the present invention, the fitting bracket that connects the side wall portion of the case and the instrument panel is extended from the front end portion or the rear end portion of the side wall portion. The deterioration of the deployment performance of the airbag due to the leakage of the portion from the portion between the airbag cover and the case can be suppressed.

  Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. In this specification, the terms “front-rear direction” and “up-down direction” are used to specify the direction, but the former is not only “horizontal direction” but also a direction slightly inclined with respect to the horizontal direction. The latter includes not only the “vertical direction” but also a direction slightly inclined with respect to the vertical direction.

  A synthetic resin instrument panel 11 shown in FIGS. 1 and 2 is arranged in front of the driver seat and the passenger seat in the vehicle. A passenger seat airbag device 12 according to this embodiment is mounted on a portion of the instrument panel 11 that is in front of the passenger seat. As shown in at least one of FIGS. 3 to 6, the passenger seat airbag apparatus 12 includes an airbag 15, an inflator 20 that supplies inflation gas to the airbag 15, and a case that holds the airbag 15 and the inflator 20. 25, a retainer 40 for attaching the airbag 15 to the case 25, and an airbag cover 50 covering the airbag 15. In FIG. 3, the inflator 20 and the retainer 40 are not shown. In FIG. 6, the inflator 20 is not shown.

  As shown in FIGS. 1 and 2, the airbag cover 50 includes a pair of front and rear door portions 51 </ b> A and 51 </ b> B at a portion of the instrument panel 11 that is in front of the passenger seat. In other words, on the back side of the portion of the instrument panel 11, a thin-walled planned break portion 52 having a substantially flat H shape or the like is formed, and a location near the planned break portion 52 is the both door portions 51 </ b> A. , 51B. Then, when the airbag 15 is inflated and deployed, the breakable portion 52 is broken, so that the front door portion 51A opens forward with its front end as a hinge, while the rear door portion 51B The end portion is configured to open backward as a hinge. In addition, the fracture | rupture scheduled part 52 may be formed in the shape different from the said plane substantially H shape, for example, a plane substantially U shape.

  Moreover, as shown in at least one of FIGS. 3 to 6, the airbag cover 50 includes a vehicle rather than the front and rear direction in addition to the door portions 51 </ b> A and 51 </ b> B that also serve as a part of the instrument panel 11 described above. A rectangular cylindrical connecting wall portion 53 is provided in the width direction. The connecting wall portion 53 will be described later.

  The airbag 15 is formed in a bag shape by a fabric. As the fabric, a material having high strength and flexibility and can be easily folded, for example, a woven fabric formed using polyester yarn, polyamide yarn, or the like is suitable. The airbag 15 has a size that can be inflated and deployed in a region between the instrument panel 11 and the passenger P in the passenger seat (see a two-dot chain line in FIG. 2). The airbag 15 is formed in a substantially rectangular parallelepiped shape by being folded, and is disposed immediately below the door portions 51A and 51B in a state of being wrapped by a wrapping sheet or the like. Although not shown, the airbag 15 has a circular opening for allowing the inflation gas from the inflator 20 to flow in and attachment holes opened at a plurality of locations around the opening.

  As the inflator 20, a disk type having a substantially disk shape is used. A gas generating agent (not shown) is accommodated in the inflator 20, and an expansion gas is generated by a combustion reaction of the gas generating agent. As the inflator 20, instead of the type using the gas generating agent, a type in which a partition wall of a high-pressure gas cylinder filled with high-pressure gas is broken with an explosive or the like to inflate expansion gas may be used. A flange 21 (see FIG. 5) for attaching the inflator 20 to the case 25 is provided on the outer periphery of the inflator 20, and attachment holes (not shown) are formed at a plurality of locations on the flange 21. In the inflator 20, a plurality of gas ejection holes (not shown) for ejecting the expansion gas are formed in the outer peripheral surface of the upper portion of the flange 21.

  The case 25 is entirely formed of a single steel plate. The case 25 includes a bottom portion 26 that is substantially horizontal on the lower side of the airbag 15. The bottom portion 26 has a horizontally long rectangular plate shape elongated in the vehicle width direction rather than in the front-rear direction. A circular insertion hole 27 that allows insertion of a portion above the flange 21 of the inflator 20 is formed in the center portion of the bottom portion 26. An attachment hole 28 is formed around the insertion hole 27 in the bottom portion 26 at a location corresponding to the attachment hole of the inflator 20.

  The retainer 40 for attaching the airbag 15 to the case 25 is formed of a steel plate. An insertion hole 42 that opens in the same shape as the insertion hole 27 of the case 25 is formed in the bottom 41 of the retainer 40. The retainer 40 includes a square tubular wall 43 extending upward from the outer edge of the bottom 41. Bolts 44 extending downward are fixed to the four corners of the bottom. Each bolt 44 is inserted into the mounting hole of the airbag 15, the mounting hole 28 of the bottom portion 26 in the case 25, and the mounting hole of the flange 21 in the inflator 20 with the retainer 40 disposed in the airbag 15. Yes. Then, by tightening a nut 45 (see FIG. 5) on each bolt 44, the airbag 15 and the inflator 20 are attached to the bottom portion 26 of the case 25. That is, with the tightening of the nut 45 to each bolt 44, the peripheral edge of the opening of the airbag 15 is pressed against the bottom 26 of the case 25 by the bottom 41 of the retainer 40 and the airbag 15 is attached to the bottom 26. As the nut 45 is tightened, the flange 21 of the inflator 20 is pressed against the periphery of the insertion hole 27, and the inflator 20 is attached to the bottom portion 26.

  On the other hand, in the vehicle body, a rein hose (not shown) as a vehicle body strength member is disposed near the lower portion of the bottom portion 26. And the bottom part 26 is being fixed to the said rein hose via the bracket etc. which are not shown in figure attached to the bottom part 26.

  The case 25 includes a pair of side wall portions 29 as wall portions protruding upward from the bottom portion 26. Each side wall 29 is formed by bending both side edges of the bottom 26 in the vehicle width direction upward. Each side wall 29 has a vertically long rectangular plate shape that is elongated in the front-rear direction rather than in the vehicle width direction. The side wall portions 29 sandwich the lower portion of the folded airbag 15 from both sides in the vehicle width direction (see FIG. 5).

  Unlike the both side edge portions, the front wall portion and the rear wall portion protruding upward corresponding to the side wall portion 29 are not formed on the front edge portion and the rear edge portion of the bottom portion 26. This is because the front wall portion and the rear wall portion are omitted to reduce the weight of the case 25 and thus the passenger seat airbag device 12, and to simplify the structure of the case 25. That is, if the bottom 26 is provided with a front wall and a rear wall in addition to the side wall 29 and connected to each other in a square box shape, the front wall and the rear wall are simply raised from the bottom 26. Instead, it is necessary to connect them to the adjacent side wall 29, and the structure becomes complicated. In this regard, in the present embodiment having a configuration in which the side wall portion 29 is merely raised from the side edge portion of the bottom portion 26, the above-described front wall portion and rear wall portion are raised from the bottom portion 26, or these are adjacent to the side wall portion 29. It is not necessary to connect to the structure, and the structure becomes simple. Further, the case 25 is lighter because there is no front wall portion and rear wall portion. Further, in order to connect the front wall portion and the rear wall portion to the side wall portion 29, it is necessary to provide and fix an overlapping portion between them, but this overlapping portion is also unnecessary, which contributes to the weight reduction of the case 25. It will be.

  Reinforcing portions 30 are provided at a plurality of locations in the front-rear direction, which are boundary portions (bent portions) between the bottom portion 26 and the side wall portions 29. Each reinforcing portion 30 is formed by deforming the boundary portion so as to protrude inward of the case 25. These reinforcing portions 30 are provided because the following points are taken into consideration.

  In case 25, each side wall 29 is only connected to bottom 26 only at its lower edge. Therefore, when the airbag 15 is inflated and deployed, and pressure is applied to each side wall portion 29 toward the outside in the vehicle width direction, the side wall portion 29 is inclined outward in the vehicle width direction with the boundary portion with the bottom portion 26 as a fulcrum. . In this case, a later-described bent portion 31 at the upper end of the side wall portion 29 comes into contact with the connecting wall portion 53 of the airbag cover 50, and the gap G (see FIG. 4) between the bent portion 31 and the connecting wall portion 53 is closed. Get smaller. Therefore, a part of the airbag 15 is prevented from leaking out through the gap G, and a decrease in the deployment performance of the airbag 15 is suppressed. If the expression is changed, a part of the airbag 15 becomes difficult to enter the gap G, so that the airbag 15 can be normally deployed. The gap G secures insertability so that the folded airbag 15 can be easily inserted into the interior of the airbag cover 50 surrounded by the connecting wall portion 53 together with the case 25. In the inserted state, the connecting wall portion 53 covers the case 25 in a spaced state from the outside. However, if this point is not taken into consideration, the connecting wall portion 53 and the bent portion 31 may be set in a state where they contact each other from the beginning.

  However, if a larger pressure than expected is applied to each side wall 29 when the airbag 15 is inflated, the side wall 29 is excessively deformed outward in the vehicle width direction and downward from the connecting wall 53. There is a fear of coming off. If it becomes like this, the function to make the said clearance gap G of the side wall part 29 small will lose | disappear. Therefore, by providing the reinforcing portion 30 as described above, the rigidity of the boundary portion between the side wall portion 29 and the bottom portion 26 is increased, and the side wall portion 29 is intended to suppress excessive deformation to the outside in the vehicle width direction.

  A bent portion 31 is formed at the upper end portion of each side wall portion 29 by bending outward in the vehicle width direction. Each bent portion 31 is formed substantially horizontally over the entire length of each side wall portion 29 in the front-rear direction. The reason why the bent portion 31 is provided at the upper end of each side wall portion 29 is that the following points are taken into consideration. That is, when the side walls 29 are pressed by the inflating and deploying airbag 15 and deformed into a bow shape so as to inflate outward in the vehicle width direction (see the two-dot chain line in FIG. 8), the outer end of the bent portion 31 Is brought into contact with the connecting wall portion 53 of the airbag cover 50 and is pressed (bite in). By this pressure contact (bite-in), the gap G between the bent portion 31 and the connecting wall portion 53 is reliably closed, and a part of the airbag 15 is prevented from entering the gap G to suppress the deployment performance of the airbag 15 from being lowered. It is.

  At the front edge portion and the rear edge portion of the bottom portion 26, locking claw portions (hooks) 32 are bent downward at a plurality of locations (three locations) spaced apart from each other in the vehicle width direction. The direction in which the locking claw portions 32 extend with respect to each bottom portion 26 is the opposite direction (downward) to the direction in which the side wall portions 29 extend (upward). Each locking claw portion 32 has a function of holding the connecting wall portion 53 that receives pressure from the airbag 15 that is inflated and deployed by being locked to the connecting wall portion 53 of the airbag cover 50.

  Here, if the front wall portion rises from the front edge portion of the bottom portion 26 and the rear wall portion also rises from the rear edge portion of the bottom portion 26, it is possible to provide the latching claw portions 32 on these. . However, in the present embodiment, as described above, the configuration in which the front wall portion and the rear wall portion are not provided is employed. Therefore, instead of these front wall portion and rear wall portion, the front edge portion and the rear portion of the bottom portion 26 are used. A locking claw 32 is provided at the edge. Even if such a configuration is adopted, the function of holding the connecting wall portion 53 by the locking claw portion 32 can be exhibited. In addition, in the present embodiment, the locking claw portion 32 is formed of the same steel plate as that of the bottom portion 26 by utilizing the fact that the locking claw portion 32 is connected to the bottom portion 26. Therefore, the latching claw portion 32 can be formed only by bending the steel plate, and the manufacture becomes easy. In addition, an overlapping portion for fixing the locking claw portion 32 to a predetermined portion (in this case, the bottom portion 26) of the case 25 becomes unnecessary. This is also effective in reducing the weight of the case 25 and simplifying the structure.

  In addition, each part of the case 25, for example, the peripheral edge part of the bottom part 26, and the locking claw part 32 are formed with a bead part 33 by drawing or the like, and the strength of the same part is increased. In addition, since the strength is increased by the bead portion 33, it is possible to contribute to weight reduction by using a thin steel plate as the case 25.

  Here, as described above, the airbag cover 50 includes the front and rear door portions 51A and 51B and the rectangular tubular connecting wall portion 53. The connecting wall portion 53 protrudes downward from the periphery of the front and rear door portions 51A and 51B in the instrument panel 11. The connecting wall portion 53 is formed integrally with the front and rear door portions 51 </ b> A and 51 </ b> B with a synthetic resin and covers the airbag 15. The airbag cover 50 covers the side wall portions 29 of the case 25 in a separated state from the outside. Here, when it is necessary to distinguish each part about the square cylindrical connection wall part 53, the part which opposes about a vehicle width direction is called the 1st wall part 54, and the part which opposes about a front-back direction is 2nd. The wall portion 55 is assumed.

  Each first wall portion 54 is spaced outward from the corresponding bent portion 31 of the case 25 in the vehicle width direction, and a gap G is formed between the inner wall surface of the first wall portion 54 and the bent portion 31. (See FIG. 4). The gap G is formed in this way, so that when the case 25 is assembled to the airbag cover 50, the case 25 can be easily inserted into the connecting wall portion 53 to improve the assembling property. Because.

  In each of the second wall portions 55, locking holes 56 are formed at a plurality of locations (three locations) spaced apart from each other in the vehicle width direction (see FIGS. 3 and 6). Each locking hole 56 is constituted by a rectangular hole that is elongated in the vehicle width direction than in the vertical direction. The connecting wall portion 53 is locked to the locking claw portion 32 by inserting and locking the locking claw portion 32 of the case 25 into the corresponding locking hole 56. With this locking, the connection state between the connection wall portion 53 and the case 25 is ensured, and the airbag 15 at the time of inflation and deployment can smoothly push up the upper and lower door portions 51A and 51B to break the planned break portion 52. I am doing so.

  Furthermore, on the back surface of the instrument panel 11, mounting bosses 13 projecting diagonally forward and downward are provided at two locations near the outside in the vehicle width direction of the front and rear door portions 51 </ b> A and 51 </ b> B. It is integrally formed as a part. Each mounting boss 13 and the corresponding side wall 29 of the case 25 are connected by a fitting bracket 60. Each fitting bracket 60 extends from the upper end of each side wall 29, goes out of the connecting wall 53, and is attached to the mounting boss 13. Each fitting bracket 60 is integrally formed of the same member as the case 25, and is connected to the front end portion in the front-rear direction at the upper end of each side wall portion 29 at its front end portion. Each fitting bracket 60 includes a connection portion 63 connected to the case 25, a connecting portion 65 having a plurality of bent portions, and an attachment portion 64 for the attachment boss 13 provided on the back surface of the instrument panel 11. Bending lines 61 and 62 (see FIG. 7) are set as bending portions at a plurality of locations (two locations) of the connecting portion 65, and the bending lines 61 and 62 are bent. Further, the bent portion is formed in a region outside the connecting wall portion 53 in the connecting portion 65. The connecting portion 63 is formed in a region inside the connecting wall portion 53. By this bending, the front end portion of each fitting bracket 60 is in a substantially horizontal state, and constitutes a connection portion 63 for the side wall portion 29. A connecting portion of the connecting portion 63 with the side wall portion 29 also serves as the bent portion 31. The rear end portion of each fitting bracket 60 constitutes a mounting portion 64 for the mounting boss 13 of the instrument panel 11 and is parallel to the mounting surface of the mounting boss 13. The connection portion 63 and the attachment portion 64 are disposed at different locations in at least one of the vehicle width direction, the front-rear direction, and the height direction. An intermediate portion of each fitting bracket 60 constitutes a connecting portion 65 that connects the connecting portion 63 and the attaching portion 64.

  Each fitting bracket 60 is formed with a bead portion 66 by drawing or the like for the purpose of increasing the strength of the fitting bracket 60 in the same manner as each portion of the case 25 described above.

  Moreover, the connection part 63 with the case 25 in each fitting bracket 60 may have a different aspect from the said embodiment. FIG.10 and FIG.11 has shown the example. In the embodiment shown in FIG. 10, notches KK are provided downward from the upper end of the side wall portion 29 on both sides of the upper portion of each side wall portion 29 according to the width dimension H of the connecting portion 65. And the connection part 63 is provided in the site | part extended further upward from the upper end of each side wall part 29 according to the width dimension H of the connection part 65. FIG. In the embodiment shown in FIG. 11, notches KK are provided downward from the upper end of the side wall 29 on both sides of the upper side of each side wall 29 in accordance with the width dimension H of the connecting portion 65. Then, a line connecting the lower ends of the cutout portions KK is defined as a bending line KS, and the connecting portion 63 is bent in the vicinity of the bending line KS by bending the connecting portion 65 outward along the bending line KS. Is formed.

  Each part of the case 25 and both fitting brackets 60 described above form an intermediate body 71 by punching out a horizontally long steel plate 70 indicated by a two-dot chain line in FIG. 7 into a desired shape, and the intermediate body 71 is formed at a plurality of locations. It is formed by bending. For example, the intermediate body 71 is bent along a bending line 72 extending in the front-rear direction, whereby the side wall portion 29 rising upward from the side edge portion of the bottom portion 26 is formed. Further, the intermediate body 71 is bent along a bending line 73 extending in the front-rear direction, so that a bent portion 31 extending outward from the upper end portion of the side wall portion 29 in the vehicle width direction is formed. Further, the intermediate claw 71 is bent along a bending line 74 extending in the vehicle width direction, whereby the locking claw portion 32 that hangs down from the front edge portion and the lower edge portion of the bottom portion 26 is formed. The intermediate body 71 is bent along the bending lines 61 and 62 described above, whereby the fitting bracket 60 having the connection portion 63, the attachment portion 64, and the coupling portion 65 is formed. In addition, in FIG. 7, the place where the code | symbol is attached | subjected to the code | symbol is each part mentioned above (the bottom part 26, the side wall part 29, the bending part 31, and the latching claw part 32) when the intermediate body 71 is bent as mentioned above. , The connection portion 63, the attachment portion 64, and the connection portion 65) are shown.

  Here, in order to bring the fitting bracket 60 extending from each side wall portion 29 out of the connecting wall portion 53, the first wall portion 54 has a notch 57 (FIGS. 3 and 5) from its lower end upward. Reference) is formed. Each fitting bracket 60 extends to the outside in the vehicle width direction of the connecting wall 53 through a corresponding notch 57. Further, the mounting portion 64 of each fitting bracket 60 is fastened to the corresponding mounting boss 13 by a screw (not shown).

  In order to attach the tip portion of each fitting bracket 60 to the mounting boss 13, it is necessary to bring the tip portion into surface contact with the mounting surface of the mounting boss 13. In the configuration of the present embodiment in which the fitting bracket 60 is formed integrally with the side wall portion 29, the front end portion of the fitting bracket 60 is connected to the side wall portion 29, and the position is determined. Ingenuity is required to bring the surface into surface contact. For example, when each fitting bracket 60 is bent at only one location, the degree of freedom in shape increases, but it is still not sufficiently high, and in some cases, it cannot be brought into surface contact with the mounting surface of the mounting boss 13. There is a fear.

  In this regard, in the present embodiment, the above-described device is achieved by bending each fitting bracket 60 at two locations. By such bending at two locations, the degree of freedom of the shape of each fitting bracket 60 becomes greater than when bending at one location. Therefore, even if it is impossible to bend at one location, the mounting portion 64 is brought into surface contact with the mounting surface of the mounting boss 13 by bending at two locations, and the mounting portion 64 is securely attached to the mounting boss 13. It becomes possible to install.

Next, the operation of the passenger seat airbag device 12 configured as described above will be described.
In a state where the case 25 is attached to the attachment boss 13 of the instrument panel 11 by the fitting bracket 60, each part of each fitting bracket 60 exhibits the following functions. The connecting portion 63 is horizontal on the same plane as the bent portion 31 and exhibits the function of connecting the fitting bracket 60 to the upper end of the side wall portion 29. Further, the mounting portion 64 is inclined in accordance with the mounting surface of the mounting boss 13 and exhibits a function of making surface contact with the mounting surface. In the present embodiment, the connection portion 63 and the attachment portion 64 are different in position in the height direction, and in the vehicle width direction, the position in the front-rear direction, and the inclination (degree, direction, etc.) are mutually different. Is different. The connection part 65 exhibits the function which connects the connection part 63 and the attachment part 64 from which a position and inclination differ in this way. As described above, the three portions of each fitting bracket 60 perform their functions, so that the case 25 is attached to the instrument panel 11 by the fitting bracket 60 regardless of the positional relationship between the side wall portion 29 and the mounting boss 13. It becomes possible to install. These three portions can be formed by bending the fitting bracket 60 at two locations.

  By the way, when an impact is applied to the vehicle from the front and gas is supplied from the inflator 20 to the airbag 15, the airbag 15 starts to expand and deploy. When the planned breakage portion 52 is broken by the airbag 15 that is inflated and deployed, the front door portion 51A opens forward with the front end portion as a hinge, and the rear door portion 51B opens rearward with the rear end portion as a hinge. Open to. The airbag 15 is inflated and deployed above the instrument panel 11 through the doors 51A and 51B opened as described above, and protects the passenger P in the passenger seat from impact (see the two-dot chain line in FIG. 2). ).

  However, a gap G is set between the side wall portion 29 (bent portion 31) of the case 25 and the connecting wall portion 53 (inner wall surface of the first wall portion 54) for assembly (see FIG. 4). Therefore, a part of the airbag 15 that is inflated and deployed may enter the gap G. When a part of the airbag 15 enters the gap G in this way, the deployment performance of the airbag 15 is reduced accordingly.

  The connecting wall 53 has a rectangular cylindrical shape and has a relatively high rigidity, but the airbag 15 is inflated and deployed with a very high pressure. Therefore, when the pressure of the airbag 15 that is inflated and deployed is applied to the location where the airbag 15 is in direct contact with the connection wall portion 53, the first wall portion 54 is moved in the front-rear direction as shown by a two-dot chain line in FIG. It is deformed into a bow shape so that it swells more outward in the vehicle width direction at the intermediate portion than at both end portions. The location where the airbag 15 is in direct contact with the connecting wall portion 53 includes, for example, a height higher than the side wall portion 29 of the case 25 in the first wall portion 54. The bulging direction is a direction in which the gap G is increased.

  However, the pressure of the airbag 15 that is inflated and deployed is also applied to the side wall portion 29 and the bent portion 31 of the case 25. Here, the connecting wall portion 53 has a rectangular cylindrical shape, whereas the case 25 is not provided with a front wall portion and a rear wall portion, and the pair of side wall portions 29 are respectively provided at the lower edge portions thereof. It is only connected to the bottom part 26. The front wall portion and the rear wall portion are not connected to the front edge portion and the rear edge portion of each side wall portion 29, and each side wall portion 29 is in a so-called cantilever support state. Therefore, a front wall portion is provided at the front edge portion of the bottom portion 26, a rear wall portion is provided at the rear edge portion, and each of the side wall portions 29 has the front wall portion and the rear wall portion at the front end portion and the rear end portion. The side wall 29 is more easily deformed than the case where it is connected to. Each side wall portion 29 tends to tilt outward in the vehicle width direction (the side on which the angle formed by the side wall portion 29 and the bottom portion 26 increases) with the boundary portion with the bottom portion 26 (the lower edge portion of the side wall portion 29) as a fulcrum. Further, each side wall portion 29 tends to be deformed into a bow shape so as to bulge more outward in the vehicle width direction at the intermediate portion than at both end portions in the front-rear direction.

  Here, since the fitting bracket 60 is provided in each side wall part 29, the rigidity of the side wall part 29 is influenced by the fitting bracket 60 as much as possible. That is, the rigidity of the boundary portion between the side wall 29 and the fitting bracket 60 is higher than the rigidity of other portions. In the present embodiment, since each fitting bracket 60 extends from the front end portion of each side wall portion 29, the rigidity of the front end portion is increased. In the center portion in the front-rear direction of each side wall portion 29, the influence of the increase in rigidity due to the provision of the fitting bracket 60 is small.

  Therefore, each side wall 29 can be deformed in an intended manner by the airbag 15 that is inflated and deployed. Specifically, with the boundary portion between the side wall portion 29 and the bottom portion 26 as a fulcrum, the side wall portion 29 is tilted outward in the vehicle width direction, or the center portion in the front-rear direction of the side wall portion 29 bulges outward in the vehicle width direction. As described above, the side wall portion 29 can be deformed into a bow shape. In particular, due to the connection with the fitting bracket 60, the rigidity of the front end portion is high at the side wall portion 29 and is not easily deformed. Therefore, the side wall portion 29 is more effectively deformed into a bow shape. By such deformation, the bent portion 31 of the side wall portion 29 is brought into close contact with the first wall portion 54 of the connecting wall portion 53, and the gap G between the bent portion 31 and the first wall portion 54 is reduced. A part of the airbag 15 that is inflated and deployed is unlikely to enter the gap G.

  Accordingly, it is not necessary to separately adopt a measure for suppressing the airbag 15 that is inflated and deployed from entering the gap G. As such a countermeasure, for example, a configuration in which the side wall portion 29 and the first wall portion 54 outside thereof are in close contact with each other can be cited. In addition, the side wall 29 and the first outer wall 54 outside the side wall 29 can be rigidly fixed with bolts or the like so that the side wall 29 can receive the pressure during inflation and deployment from the airbag 15. For example, the portion 29 and the first wall portion 54 are less likely to be deformed. In the present embodiment, since the gap G can be reduced by using the deformation of the side wall portion 29 as described above, the above-described separate measures are not necessary. Further, there is no possibility of occurrence of a new problem due to taking the former measure, that is, a problem that the gap G becomes small and the attachment of the case 25 to the airbag cover 50 is deteriorated. Furthermore, there is no possibility of a new problem due to taking the latter measure, that is, a problem of an increase in weight due to increasing the rigidity of the side wall portion 29 and the first wall portion 54 or using a fixture.

  In addition, in case 25, the rigidity of the boundary part of the side wall part 29 and the bottom part 26 is improved by providing the reinforcement part 30. FIG. Therefore, even if a large unintentional pressure is applied to each side wall 29 when the airbag 15 is inflated and deployed, the phenomenon that the side wall 29 is excessively deformed outward in the vehicle width direction is restricted by the reinforcing portion 30. . It is suppressed that the side wall part 29 remove | deviates from the corresponding wall part (1st wall part 54) of the connection wall part 53 below. As a result, the phenomenon in which the side wall portion 29 moves downward from the first wall portion 54 and the function of reducing the gap G between the side wall portion 29 (bending portion 31) and the first wall portion 54 disappears hardly occurs.

  Further, since each fitting bracket 60 is integrally formed of the same member as the case 25, the passenger seat airbag device 12 is lighter than the case where the fitting bracket 60 is configured by a member different from the case 25. Become. This is because, when constituted by another member, the fitting bracket 60 needs to be overlapped with the case 25 for fixing, or another member (welding material, adhesive, rivet, etc.) for fixing is required. This is because, in the case where the same member is used, such overlapping portions and other members for fixing are not necessary.

  When the airbag 15 is inflated and deployed, the pressure of the airbag 15 is received by the second wall portion 55 of the connecting wall portion 53. These second wall portions 55 also try to deform into a bow shape, but in the first place, the wall portions (front wall portion, rear wall portion) on the case 25 side are not provided inside them. Therefore, there is no gap between the second wall portion 55 and the front wall portion, or between the second wall portion 55 and the rear wall portion, and the phenomenon that the airbag 15 enters the gap does not occur. Only there is a gap between the second wall portion 55 of the airbag cover 50 and the bottom portion 26 of the case 25, but this gap is originally narrow and is difficult to expand even if the airbag 15 is inflated and deployed. This is because the locking claw portions 32 formed at a plurality of locations on the front edge portion and the rear edge portion of the bottom portion 26 are inserted and locked in the locking holes 56 of the second wall portion 55, and in the vicinity of the bottom portion 26, This is because the deformation of the two wall portions 55 is restricted.

  Further, of the energy accompanying the inflation and deployment of the airbag 15, part of the component in the vehicle width direction is absorbed by the side wall portion 29 and the first wall portion 54 being deformed into a bow shape as described above. At this time, in the case 25, the pair of side wall portions 29 are provided at locations facing each other, and in the airbag cover 50, the pair of first wall portions 54 are provided at locations facing each other. Absorbed substantially equally on both sides in the vehicle width direction.

  Similarly, a part of the component in the front-rear direction among the energy accompanying the inflation and deployment of the airbag 15 is absorbed when the second wall portion 55 of the airbag cover 50 is deformed as described above. At this time, in the airbag cover 50, the second wall portion 55 is provided at a location facing each other. Further, locking holes 56 are formed in the second wall portions 55 at positions opposite to each other in the front-rear direction, and the locking claws 32 of the case 25 are inserted and locked into these locking holes 56. . Therefore, when receiving the pressure of the airbag 15 that is inflated and deployed, the second wall portions 55 are deformed to the same extent, and the energy is evenly absorbed on both sides in the front-rear direction.

  Furthermore, a part of the downward component of the energy accompanying the inflation and deployment of the airbag 15 is absorbed by the bottom portion 26 being deformed downward. Therefore, in the case 25, the locking claw portion 32 connected to the bottom portion 26 is locked in the locking hole 56 of the airbag cover 50, but the energy component is concentrated on the locking claw portion 32, It is difficult for the locking claw portion 32 to be locally deformed. Therefore, the function of holding the airbag cover 50, which is the original function of the latching claw portion 32, is also exhibited reliably.

According to the embodiment described above in detail, the following effects can be obtained.
(1) As the fitting bracket 60 that connects the pair of side wall portions 29 projecting upward from the bottom portion 26 of the case 25 and sandwiching the airbag 15 from at least both sides in the vehicle width direction, and the mounting boss 13 of the instrument panel 11, each side wall is used. A portion extending from the front end of the portion 29 is employed. Therefore, each side wall 29 and the bent portion 31 can be deformed in an intended manner by the airbag 15 that is inflated and deployed. The deformation in the intended manner means that the side wall 29 and the bent portion 31 are inclined outward in the vehicle width direction with the boundary portion between the side wall 29 and the bottom 26 as a fulcrum, and the side wall 29 and the bent portion 31 The side wall portion 29 and the bent portion 31 are deformed into a bow shape so that the center portion in the front-rear direction is the largest and bulges outward in the vehicle width direction. In particular, in the side wall part 29, the rigidity of the front end part, which is a connection point with the fitting bracket 60, is high and hardly deformed. Therefore, the side wall part 29 and the bent part 31 can be more effectively deformed into a bow shape. And by such a deformation | transformation, the side wall part 29 (bending part 31) is contact | abutted (contact | adhered) to the airbag cover 50, and the clearance gap G between the side wall part 29 (bending part 31) and the connection wall part 53 can be made small. it can. As a result, it is possible to suppress a decrease in the deployment performance of the airbag 15 due to a part of the airbag 15 that is inflated and deployed leaking out from the portion between the airbag cover 50 and the case 25 through the gap G.

  (2) Each fitting bracket 60 is integrally formed of the same member (steel plate 70) as the case 25 and is connected to the case 25 at the front end of the side wall 29. For this reason, the airbag device for a passenger seat can be made lighter than when the fitting bracket 60 is formed by a member different from the case 25.

  (3) Bending lines 61 and 62 are set at locations where the intermediate body 71 formed by punching the steel plate 70 is to be the fitting bracket 60, and the intermediate body 71 is bent along these bending lines 61 and 62. Yes. Therefore, the degree of freedom of the shape of the fitting bracket 60 is high, and the connection portion 63 that can be connected to the side wall portion 29 and the mounting portion 64 that can be in surface contact with the mounting boss 13 regardless of the positional relationship between the side wall portion 29 and the mounting boss 13. It is possible to reliably form the fitting bracket 60 having the following. This effect is largely due to the fact that the fitting bracket 60 has two bent portions (bent lines 61 and 62) and has a connecting portion 65. It is because the connection part 65 exhibits the function which absorbs the difference in the position of the connection part 63 and the attachment part 64, and the difference in an angle. In other words, by setting the connecting portion 65 in the middle portion of the fitting bracket 60, the degree of freedom of the shape of the fitting bracket 60 is greatly increased, and the connecting portions 65 are connected regardless of the positional relationship between the side wall portion 29 and the mounting boss 13. A possible fitting bracket 60 can be realized.

Moreover, the length and direction of the connection part 63, the attachment part 64, and the connection part 65 can be changed into a desired thing by changing the position and inclination of the bending lines 61 and 62. FIG.
(4) The wall portion protruding upward from the bottom portion 26 of the case 25 is constituted by only the pair of side wall portions 29. The case 25 is not provided with a pair of wall portions (front wall portion and rear wall portion) that protrude upward from the bottom portion 26 and sandwich the airbag 15 from the front-rear direction. Therefore, the case 25 can be made lighter than when such a front wall portion and a rear wall portion are provided on the bottom portion 26. Further, the fact that the locking claw portion 32 is formed integrally with the bottom portion 26 is also helpful in reducing the weight of the case 25.

Further, each side wall portion 29 is in a so-called cantilevered support state supported by the bottom portion 26 only at its lower edge portion, and thus is easily deformed by the airbag 15 that is inflated and deployed.
(5) The case 25 having the bottom portion 26 and the side wall portion 29 as a basic skeleton and having the reinforcing portion 30, the bent portion 31, the locking claw portion 32, the bead portions 33 and 66, and the fitting bracket 60 is formed from a single steel plate 70. Therefore, the yield can be improved.

  (6) By changing the bending position and bending angle of the fitting bracket 60, it is possible to deal with various variations in the positional relationship between the case 25 and the mounting boss 13. For this reason, it becomes possible to employ | adopt the case 25 in this embodiment as a common component about the multiple types of airbag apparatus 12 for passenger seats. Even if the positional relationship between the case 25 and the mounting boss 13 is different between the types of the airbag device 12 for the passenger seat, as described above, it can be handled by changing the bending position and the bending angle of the fitting bracket 60. Because you can.

Note that the present invention can be embodied in another embodiment described below.
<About fitting bracket 60>
-Each fitting bracket 60 should just extend from the front-end part or rear-end part of each side wall part 29. FIG. Therefore, unlike the above embodiment, the following mode is also possible.

A mode in which both of the pair of fitting brackets 60 extend from the rear end portion of the side wall portion 29.
A mode in which one fitting bracket 60 extends from the front end portion of the corresponding side wall portion 29 and the other fitting bracket 60 extends from the rear end portion of the corresponding side wall portion 29.

  -As shown in FIG. 9, you may comprise each fitting bracket 60 by a member different from the case 25. As shown in FIG. In this case, the fitting bracket 60 is joined to the front end portion or the rear end portion of the side wall portion 29. As this joining means, for example, welding, adhesion, riveting or the like can be employed.

  In the intermediate body 71, three or more bending lines (bending points) may be set with respect to the part to be the fitting bracket 60, and the intermediate body 71 may be bent along these bending lines. In this case, both end portions of the formed fitting bracket 60 serve as a connection portion 63 for the side wall portion 29 and an attachment portion 64 for the attachment boss 13. The connecting portion 65 is bent halfway. As the number of bent portions increases, the degree of freedom of the shape of the connecting portion 65 and the degree of freedom of the shape of the fitting bracket 60 increase, and the attachment to the attachment boss 13 is improved.

<About Case 25>
-As a wall part which protrudes upwards from the bottom part 26 of case 25, although a pair of side wall part 29 which pinches the airbag 15 from the vehicle width direction both sides is essential, you may provide a front wall part and a rear wall part further. . By making this change, the case 25 has a bottomed square box shape with an open top surface. In this case, the front wall portion and the rear wall portion may be connected to the adjacent side wall portion 29, or may be separated from the side wall portion 29 and brought into a non-contact state with respect to the side wall portion 29. When the front wall portion and the rear wall portion are connected to the adjacent side wall portion 29, the side wall portion 29 can be deformed into a bow shape by the airbag 15 that is inflated and deployed, although not as much as in the above embodiment. Further, by extending the fitting bracket 60 from the front end portion or the rear end portion of the side wall portion 29, an effect of reducing the influence of the fitting bracket 60 on the bow-shaped deformation of the side wall portion 29 can be obtained.

  -You may change suitably the position and number of the latching claw part 32 in the case 25, the reinforcement part 30, and the bead parts 33 and 66. FIG. For example, you may provide the reinforcement part 30 in the one side wall part 29 in the location which does not oppose the reinforcement part 30 in the other side wall part 29. FIG. Moreover, you may provide the latching claw part 32 in the front edge part of the bottom part 26 in the location which does not oppose the latching claw part 32 in a rear edge part.

  -You may abbreviate | omit suitably each reinforcement part 30, the bending part 31, and the bead parts 33 and 66 in case 25. FIG. When the bent portion 31 is omitted, the side wall 29 is inclined outward in the vehicle width direction or deformed into a bow shape by the pressure of the inflating and deploying airbag 15, and directly contacts the connecting wall 53. The effect of reducing the gap G is exhibited.

  The bottom portion 26 of the case 25 may have a shape different from the horizontally long rectangular shape, for example, a substantially trapezoidal shape. Even when the bottom portion 26 has a substantially trapezoidal shape, the side wall portions 29 can be provided on both side edge portions thereof. However, in this case, unlike the above-described embodiment, the side wall portions 29 are not parallel to each other.

  -The front end portion of the locking claw portion 32 may be bent upward and replaced. Also in this case, the locking claw 32 can be locked to the connecting wall 53 through the locking hole 56 and the connecting wall 53 can be held in the case 25.

<About the instrument panel 11>
The instrument panel 11 may be one in which the door portions 51A and 51B are formed by separate members in addition to the one in which the door portions 51A and 51B are integrated as in the above embodiment.

The perspective view which shows the instrument panel by which the airbag apparatus for passenger seats was mounted in one Embodiment which actualized this invention. The schematic plan view which shows the effect | action which the airbag of the airbag apparatus for passenger seats expand | deploys and protects the passenger | crew of a passenger seat. The perspective view which shows the positional relationship of the connection wall part of an airbag cover, a case, and an attachment boss | hub. Similarly, the top view which shows the positional relationship of a connection wall part, a case, and a mounting boss | hub. The front view which shows the state which looked at the case of FIG. 4 etc. from the direction (front) shown by arrow A. FIG. The side view which shows the state which looked at the case etc. of FIG. 4 from the direction (left side) shown by arrow B. FIG. The top view which shows the intermediate body of the case formed by stamping a steel plate in a defined shape. The top view which shows a mode that an airbag expand | swells and expands from the state of FIG. 4, and the 1st wall part of a connection wall part and the side wall part of a case deform | transform into a bow shape. It is a figure corresponding to FIG. 6, and the side view which shows another embodiment which fixed the fitting bracket formed by the member different from a case to the side wall part. The fragmentary perspective view which shows another example of the connection part in each fitting bracket. Similarly, the fragmentary perspective view which shows the other example of the connection part in each fitting bracket. The exploded perspective view of the conventional airbag apparatus for passenger seats.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Instrument panel, 12 ... Air bag apparatus for passenger seats, 15 ... Air bag, 25 ... Case, 26 ... Bottom part, 29 ... Side wall part, 50 ... Air bag cover, 51A, 51B ... Door part, 53 ... Connection wall Part, 60 ... fitting bracket, 61, 62 ... bending line (bent part), 63 ... connection part, 64 ... attachment part.

Claims (5)

An airbag device for a passenger seat mounted on a part of an instrument panel in front of the passenger seat,
The airbag is for storing a folded airbag, and includes a bottom portion disposed in a substantially horizontal state on the lower side of the airbag, and the airbag as a wall portion protruding upward from the bottom portion. A case having a pair of side wall portions sandwiched at least from both sides in the vehicle width direction;
A door portion disposed on an upper side of the airbag, and a cylindrical connecting wall portion projecting downward from the periphery of the door portion, the door portion and the connecting wall portion, the airbag and the case of the case An airbag cover that covers both side walls from the outside;
Passenger seat air, comprising: a pair of fitting brackets extending from the front end portion or the rear end portion of each side wall portion in the case, and coming out of the connecting wall portion and attached to the instrument panel. Bag device. 2. The airbag device for a passenger seat according to claim 1, wherein each of the fitting brackets is formed of a member different from the case and is joined to a front end portion or a rear end portion of the side wall portion. 2. The airbag device for a passenger seat according to claim 1, wherein each of the fitting brackets is integrally formed of the same member as the case and is connected to the case at a front end portion or a rear end portion of the side wall portion. Each of the fitting brackets is provided with two or more bent portions for forming a connection portion with respect to the side wall portion and an attachment portion with respect to the instrument panel, and each fitting bracket is bent at each of the bent portions. The airbag device for a passenger seat according to claim 3. The airbag device for a passenger seat according to any one of claims 1 to 4, wherein the side wall portion projecting upward from the bottom portion of the case includes only the pair of side wall portions.

Images