JP5920124B2 - Manufacturing method of airbag device and airbag device - Google Patents

Description

The present invention relates to a method for manufacturing an airbag device and an airbag device in which a case for housing an airbag and an inflator is made of a synthetic resin, and an airbag cover is locked and connected.

  In a conventional airbag device, for example, a passenger seat airbag device, a case for storing an airbag and an inflator includes a plurality of locking claws for locking an airbag cover so that the assembly can be easily performed. And made of synthetic resin so that the weight can be reduced (for example, see Patent Documents 1 and 2).

  In these airbag apparatuses, the case has a substantially rectangular parallelepiped shape having a bottom wall portion and a rectangular cylindrical peripheral wall portion extending upward from the outer peripheral edge of the bottom wall portion, and opening the upper portion. The air bag was held on the bottom wall. The airbag cover is made of synthetic resin, covers the stored airbag, has a ceiling wall portion having a door portion that is pushed by the airbag when inflated and opens, and extends downward from the periphery of the door portion. And a connecting wall portion having a substantially rectangular tube shape that is disposed on the outer peripheral side of the peripheral wall portion and connected to the peripheral wall portion. Each of the pair of opposing wall portions facing each other of the peripheral wall portion of the case includes a plurality of locking claws protruding outward so that the connection wall portion can be locked. The connecting wall portion of the airbag cover is configured to include a plurality of through-holes through which the engaging claws are inserted so as to be engageable with the engaging claws.

  Each of the locking claws is arranged on the case side so that the connecting wall portion of the airbag cover is arranged on the outer peripheral side of the peripheral wall portion of the case and can be easily inserted into the locking hole of the connecting wall portion when assembled. An inclined guide surface is provided on the outer surface so that the lower end of the connecting wall portion to be pushed down can be guided by sliding to the outer peripheral side of the locking claw.

JP 2000-326813 A JP 2001-270412 A

  However, the conventional claw of the synthetic resin case has a guide surface arranged so as to incline outward from the upper end of the peripheral wall portion, and the upper end coincides with the upper end of the peripheral wall portion itself ( In other words, the upper end of the guide surface is arranged on the lower side away from the upper end of the peripheral wall portion itself. Therefore, when the lower end of the connecting wall portion is applied to the guide surface, it is necessary to arrange the entire inner circumference side of the lower end of the connecting wall portion of the airbag cover on the outer peripheral side over the entire upper end of the peripheral wall portion of the case itself. Yes, if the connecting wall part is displaced during assembly and the lower end of the connecting wall part hits the upper end of the peripheral wall part near the locking claw, the lower end of the connecting wall part cannot be applied to the guide surface. It took time and effort, and there was a problem in assembling. In particular, if the ceiling wall part of the airbag cover is composed of a large instrument panel, it will be obstructed by the ceiling wall part, and it will be difficult to see the lower end of the guide surface and the connecting wall part. It encourages challenges.

  In addition, when the airbag cover is opened, when the airbag cover opens the door part, a strong tensile force acts on the latching claw. In this locking claw, there is a risk of deformation.

The present invention solves the above-described problems, and an air that can be easily achieved with a simple configuration to improve the assembly of the synthetic resin case and the airbag cover and to improve the strength of the locking claws of the case. It is an object of the present invention to provide a method for manufacturing a bag device and an airbag device .

Substantially method of manufacturing an airbag apparatus according to the present invention, an airbag apparatus, extending the air bag, and the inflator supplies inflation gas to the airbag, from the outer peripheral edge of the bottom wall and the bottom wall portion upwardly It has a rectangular parallelepiped shape that has a rectangular cylindrical peripheral wall and opens upward, and stores and holds the inflator and the folded airbag, and stores the airbag when inflated so that it can protrude. And a synthetic resin airbag cover that covers the airbag ,
The airbag cover covers the stored airbag, and has a ceiling wall portion having a door portion that is pushed and opened by the airbag when inflated, and extends downward from the periphery of the door portion to extend the case. A substantially rectangular tube-shaped connecting wall portion disposed on the outer peripheral side of the peripheral wall portion and connected to the peripheral wall portion,
A pair of opposing wall portions opposed to the peripheral wall portion each include a plurality of locking claws protruding outward so as to be able to lock the connecting wall portion,
The connecting wall portion of the airbag cover is configured to include a plurality of locking holes for inserting the locking claws so as to be locked to the locking claws ,
When assembling the case and the airbag cover, the connecting wall portion of the airbag cover is pushed downward from above with respect to the peripheral wall portion of the case, and the connecting wall portion of the airbag cover is A method of manufacturing an airbag device that is disposed on the outer peripheral side of a peripheral wall portion of a case and is assembled and manufactured so as to lock the connecting wall portion to the locking claw inserted into the locking hole ;
The case is configured as a synthetic resin,
The locking claw is
A neck that extends outward from the upper end of the opposing wall and is disposed on the inner peripheral side of the locking hole at the time of locking;
A locking piece that extends downward from the tip of the neck and restricts the locking claw from coming off from the locking hole;
With
On the upper surface of the locking claw, as the opposing walls plate extending along the opposing direction of, and can restrict bending upward the neck, and a connecting wall portion of the airbag cover of the case A claw reinforcing rib provided with a guide surface on the top surface capable of guiding the lower end of the connecting wall portion to the outer peripheral side of the locking piece portion of the locking claw when assembled to be arranged on the outer peripheral side of the peripheral wall portion, It is arranged so as to protrude upward from the upper end of the wall and extend to the inner edge of the peripheral wall portion.

In the method for manufacturing an airbag device according to the present invention, when the case and the airbag cover are assembled, the connecting wall portion of the airbag cover is pushed downward from above with respect to the peripheral wall portion of the case. Then, the connection wall part comes into contact with the lower end of the guide wall of the claw reinforcing rib protruding upward from the upper end of the peripheral wall part itself before it hits the upper end of the peripheral wall part. The lower end is arranged on the outer peripheral side of the locking piece portion, and is pushed into the guide surface, and the locking piece portion and the neck portion are sequentially inserted into the locking hole, and the locking piece portion is further connected to the connecting wall portion. As a result, the assembling operation can be completed. That is, when assembling the airbag cover to the case, the lower end of the connecting wall portion easily hits the guide surface, so that the assembling property is improved.

  Further, when the airbag is inflated, the airbag presses the ceiling wall portion upward to open the door portion, so that the connection wall portion is also pulled upward together with the ceiling wall portion, and the locking hole A strong pressing force acts upward on the neck portion of the locking claw located on the inner peripheral side. However, since the claw reinforcing ribs are arranged so as to extend to the inner edge of the peripheral wall portion, the bending rigidity of the neck portion is large, and the strength is improved so that the locking claw can regulate the bending of the neck portion. Therefore, even if a large upward pressing force acts on the neck, the latching claw is restrained from being deformed, preventing the latching piece from coming off from the latching hole, and stably engaging the airbag cover. You can stop.

  And in this invention, these assembly | attachment improvement and the improvement of the intensity | strength of a latching claw are easily achieved by the nail | claw reinforcement rib provided in the upper surface of a latching claw.

Therefore, the manufacturing method of the airbag apparatus according to the present invention is a simple method of providing a predetermined nail reinforcing rib for improving the assembly of the synthetic resin case and the airbag cover and improving the strength of the locking claw of the case. This can be easily achieved with a simple configuration.
As an air bag device suitable for this manufacturing method, a claw reinforcing rib is provided with an upper surface that is inclined downward from the upper end arranged to be shifted inward of the case from the neck portion toward the outer side, If it is arranged so that it protrudes upward from the upper end of the peripheral wall part and extends to the inner edge of the peripheral wall part, a part inclined downward from the upper end on the upper surface of the claw reinforcing rib is used as a guide surface during assembly. Can be preferably used.

In the airbag device manufacturing method and the airbag device according to the present invention, the locking claws are disposed corresponding to the opposed positions of the pair of opposed wall portions,
The case in which the band-shaped case reinforcing ribs arranged in parallel with the claw reinforcing ribs connect the arrangement positions of the pair of engaging claws arranged opposite to each other so that bending of the case can be restricted. It is desirable to project from the outer surface of the peripheral wall portion and the bottom wall portion.

  In such a configuration, the case reinforcing rib is disposed so as to be continuous with the claw reinforcing rib, although it is on the outer surface side of the peripheral wall portion. Therefore, when the airbag is inflated, the neck portion of the locking claw receives a strong tensile force upward, and even if it tries to bend the peripheral wall portion, the case reinforcing rib can resist the bending deformation and prevent the deformation, As a result, the bending deformation of the peripheral wall portion that displaces the locking claw can be accurately prevented, and the detachment of the locking piece portion from the locking hole can be prevented more stably.

In the airbag apparatus manufacturing method and the airbag apparatus according to the present invention, the case reinforcing rib is orthogonal to the claw extension direction rib in addition to the claw extension direction rib connecting the arrangement positions of the pair of locking claws. It is desirable to be provided with a plurality of claw orthogonal direction ribs arranged in the direction.

  In such a configuration, the peripheral wall portion and the bottom wall portion of the case can secure further rigidity by the plurality of claw extension direction ribs and the claw orthogonal direction ribs of the case reinforcing ribs arranged in a lattice shape, and as a result, It is possible to accurately prevent deformation of the case itself when the airbag is inflated, and to accurately prevent bending deformation of the peripheral wall portion and the bottom wall portion that displace the locking claws, and from the locking hole of the locking piece portion. Detachment can be prevented more stably.

In the airbag apparatus manufacturing method and the airbag apparatus according to the present invention, the peripheral wall portion of the case is disposed on the entire periphery on the outer peripheral side at the upper end side of the main body portion and the main body portion connected to the upper surface side of the bottom wall portion. An outer wall part, and a connecting rib that connects the outer peripheral side of the main body part and the inner peripheral side of the outer wall part,
A horizontal plate portion disposed near the middle of the outer wall portion in the vertical direction so as to block the connection rib between the main body portion and the outer wall portion, and the main body portion at the upper and lower surfaces of the horizontal plate portion. A vertical plate portion having an upper vertical plate portion and a lower vertical plate portion extending outwardly in a band shape and continuing to the outer wall portion.
The lower vertical plate portion of the connecting rib is formed from upper ends of the claw extension direction rib and the claw orthogonal direction rib,
The upper vertical plate portions of the connecting ribs are respectively arranged so as to overlap above the lower vertical plate portions,
It is desirable that the claw reinforcing rib is disposed so as to extend from an upper portion of the upper vertical plate portion.

  In such a configuration, the upper end of the peripheral wall portion is constituted by the upper end of the main body portion and the outer wall portion connected by the connecting rib, and the connecting rib is constituted by the horizontal plate portion and the vertical plate portion. . In other words, the space between the upper and lower vertical plate portions of the horizontal plate portion becomes a meat stealing concave portion, and the case can be further reduced in weight.

  Of course, even if such a meat stealing recess is provided, the lower vertical plate portion of the connecting rib is formed from the upper ends of the claw extension direction rib and the claw orthogonal direction rib, and the upper vertical plate portion of the connecting rib is Each of the ribs is arranged so as to overlap with the lower vertical plate part, and the claw reinforcing ribs are arranged so as to extend from the upper part of the upper vertical plate part. Therefore, the bending rigidity of the entire case including the locking claws is ensured.

In the method of manufacturing an airbag device and the airbag device according to the present invention, the airbag cover and the fixing means are disposed between the side wall portions of the peripheral wall portion of the case facing each other in the direction orthogonal to the opposing direction of the pair of opposing wall portions. A bracket portion having a connecting hole penetrating in the vertical direction so as to be connectable is projected outward,
It is desirable that the bracket portion is provided with band-like support reinforcing ribs that are continuous from the ribs in the claw orthogonal direction on both edges on the lower surface side.

  In such a configuration, the airbag cover is connected to the bracket portion extending from the side wall portion of the case using the fixing means, in addition to the connection to the pair of opposing wall portions by the locking claws. As a result, the ceiling wall part of the airbag cover is connected to the peripheral wall part of the substantially rectangular tube shape of the case by the locking claw and the fixing means by interposing the connecting wall part. Thus, when the door portion of the airbag cover is opened, the ceiling wall portion around the door portion becomes difficult to move upward, and the door portion can be quickly opened.

  Of course, the bracket portion is reinforced by the support reinforcing ribs that are connected to the ribs in the claw orthogonal direction arranged on the peripheral wall portion and the bottom wall portion of the case, and the strength is ensured without increasing the weight.

1 is a longitudinal sectional view along the front-rear direction of a vehicle showing a use state of an airbag device according to an embodiment of the present invention. It is a longitudinal cross-sectional view along the left-right direction of the vehicle which shows the use condition of the airbag apparatus of embodiment. It is a perspective view which shows the component of the airbag apparatus of embodiment. It is a perspective view of the case used for the airbag apparatus of embodiment. It is a front view of the case used for the airbag apparatus of an embodiment. It is a top view of the case used for the airbag apparatus of an embodiment. It is a bottom view of the case used for the airbag apparatus of an embodiment. It is a side view of the case used for the airbag apparatus of an embodiment. It is a fragmentary longitudinal cross-sectional view of the case used for the airbag apparatus of embodiment, and respond | corresponds to the IXA-IXA site | part of FIG. 6, the IXB-IXB site | part, and the IXC-IXC site | part, respectively. It is a fragmentary longitudinal cross-section which shows the state which attaches an airbag cover to the case in the airbag apparatus of embodiment. It is a fragmentary longitudinal cross-sectional view which shows the state which attaches an airbag cover to the case in the airbag apparatus of embodiment, and shows the state after FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, an airbag apparatus M according to an embodiment is attached to an instrument panel (hereinafter abbreviated as an instrument panel) 1 in front of a passenger seat. An airbag device for a passenger seat to be disposed; a folded airbag 10; an inflator 18 for supplying an inflation gas to the airbag 10; a case 21 for storing and holding the airbag 10 and the inflator 18; A retainer 13 for attaching the airbag 10 and the inflator 18 to the case 21, an airbag cover 52 for covering the folded airbag 10, and an attachment bracket 65 for fixing the airbag device M to the vehicle. It is configured.

  In the case of the embodiment, the airbag cover 52 is formed integrally with the instrument panel 1, but a predetermined assembly hole is opened in the instrument panel 1, and the instrument panel 1 is separated from the opening part. An airbag cover may be provided.

  Moreover, the reference | standard of the up-down direction of this invention is based on the case 21 of the airbag apparatus M, and corresponds with the up-down direction of the bottom wall part 22 mentioned later. Further, the front-rear and left-right directions in the specification correspond to the vehicle on which the airbag apparatus M is mounted, and the opposite direction of the opposite wall 25 (25F, 25B) of the peripheral wall 24 described later is the opposite wall. The portion 25F is the front side, the opposing wall portion 25R is the rear side, the opposing direction of the side wall portions 26 (26L, 26R) of the peripheral wall portion 24 is the left-right direction, the side wall portion 26L is the left side, and the side wall portion 26R is the right side. .

  As shown in FIGS. 1 and 2, the airbag 10 is formed from a flexible woven fabric such as polyester or polyamide as a bag shape having a circular opening 10 a for allowing inflation gas to flow into the lower portion thereof. Yes. A peripheral edge 11 of the opening 10a is a portion pressed by a substantially square annular retainer 13, and a plurality of (four in the embodiment) for attaching the airbag 10 to the bottom wall portion 22 of the case 21 are provided on the peripheral edge 11 of the opening. A mounting hole 11a is formed.

  The retainer 13 that attaches the airbag 10 to the case 21 is made of sheet metal and includes a substantially square annular main body 14 as shown in FIGS. The main body 14 includes a substantially square plate-like bottom wall portion 14a having a circular opening at the center, and four vertical wall portions 14b extending upward from the edge of the bottom wall portion 14a. Bolts 15 are provided so as to protrude downward from the vicinity of the four corners.

  And the retainer 13 arrange | positions each bolt 15 in the airbag 10 so that it may protrude from the attachment hole 11a of the airbag 10, and each bolt 15 is mentioned later in the through-hole 23a of the case 21, and the inflator 18 mentions later. The bottom wall portion 14a of the retainer 13 is attached to the airbag 10 by inserting the nut 16 into each bolt 15 by inserting it into the mounting hole 20a of the flange portion 20 and a through-hole 66a to be described later of the mounting bracket 65. The opening periphery 11, the flange portion 20 of the inflator 18, and the mounting bracket 65 are fixedly attached to the bottom wall portion 22 of the case 21.

  The mounting bracket 65 is made of sheet metal and includes a symmetrical support seat 66 (66L, 66R) and a U-shaped support arm 67 that connects the left and right support seats 66L, 66R. The nut 68 is fixed to the head. The mounting bracket 65 is fixed to the bracket 5 extending from the instrument panel hose 3 by using a bolt 7 screwed to the nut 68. By this fixing, the airbag device M is mounted on the vehicle. The Rukoto.

  The inflator 18 includes a columnar main body portion 19 provided with a gas discharge port 19 a on the upper side, and a flange portion 20 disposed on the outer peripheral surface of the main body portion 19. The flange portion 20 is provided with an attachment hole 20a through which the bolt 15 is inserted.

  The airbag cover 52 is formed of a polyolefin-based or polyester-based thermoplastic elastomer or the like, and is integrally formed with the instrument panel 1 in the case of the embodiment. The airbag cover 52 covers the airbag 10 accommodated in the case 21 and has a ceiling wall portion 53 having a door portion 54 (54F, 54B) that is pushed and opened by the airbag 10 when inflated, and a door portion 54. And a connecting wall portion 58 having a substantially rectangular tube shape that is disposed on the outer peripheral side of the peripheral wall portion 24 described later of the case 21 and is connected to the peripheral wall portion 24.

  The door portions 54F and 54B are substantially rectangular plate-like shapes, and are disposed on the front and rear sides, the front door portion 54F has a hinge portion 55 disposed on the front edge side, and the rear door portion 54B has a hinge portion on the rear edge side. 55, and a thin portion to be broken 56 is provided around the periphery of the hinge portion 55 except for the portion of the hinge portion 55. Therefore, when the door portions 54F and 54B are pushed by the inflating airbag 10, the planned breaking portion 56 is broken and opened separately on both the front and rear sides.

  The connecting wall portion 58 has a plurality of latches for inserting the latching claws 41 so that the latched wall portions 59 (59F, 59B) opposed in the front-rear direction can be latched to the latching claws 41 described later of the case 21. A hole 59a is provided. Each of the locking holes 59a penetrates in the front-rear direction as a rectangular opening, and is provided in parallel along the left-right direction by six on each of the front and rear locked wall portions 59F, 59B.

  The part which opposes the connection wall part 58 in the left-right direction is a part fixed to a bracket part 48 described later of the case 21 as a fixing wall part 61 (61L, 61B). The left and right fixing wall portions 61L and 61R are respectively provided with belt-like fastening seats 62 that are U-shaped when viewed from the left-right direction, and screws (fixing means) are provided on the bottom wall 62a of each fastening seat 62. A fastening hole 62b for screwing a tapping screw 70 is penetrated along the vertical direction.

  The case 21 is integrally formed by injection molding as a synthetic resin such as polypropylene or polyamide containing filler, and as shown in FIGS. 1 to 4, the bottom wall portion 22 has a substantially rectangular plate shape that is long in the left-right direction. And a substantially rectangular tube-shaped peripheral wall portion 24 that extends upward from the outer peripheral edge of the bottom wall portion 22 and accommodates the inflator 18 and the folded airbag 10 as a substantially rectangular parallelepiped shape that opens upward. Hold.

  As shown in FIGS. 1, 2, 4, 6, and 7, the bottom wall portion 22 includes an insertion hole 22a that is opened in a circular shape into which the main body portion 19 of the inflator 18 can be inserted from below, and the periphery of the insertion hole 22a is As a mounting seat 23 for holding the airbag 10 and the inflator 18, a through hole 23 a through which the bolt 15 of the retainer 13 passes is provided in the mounting seat 23.

  As shown in FIGS. 1, 2, 4 to 9, the peripheral wall portion 24 includes a pair of opposed wall portions 25 (25F, 25B) opposed in the front-rear direction and a pair of side wall portions 26 (26L, 26R) opposed in the left-right direction. ) And. In the case of the embodiment, the opposing wall portion 25 has a large planar portion extending along the vertical direction, and the side wall portion 26 has the lower edge 26b and the left and right edges 22b and 22c of the bottom wall portion 22 in the outward direction. It is formed so as to gradually rise in a curved shape, and is arranged along the vertical direction in the vicinity of the upper end 26a.

  Therefore, when viewed from above, the case 21 has a substantially rectangular parallelepiped upper opening 21b having a long rectangular shape in the left-right direction. In front view, the case 21 has a large R shape from the bottom wall 22 as shown in FIGS. As shown in FIGS. 1, 8, and 9, the side walls 26 rise in a curved shape, and the front and rear edges 22 d and 22 e and the lower end 25 b of the bottom wall 22 are connected in a small R shape, as shown in FIGS. The opposing wall portion 25 rises upward in a planar shape to have a substantially rectangular parallelepiped shape.

  The front and rear opposing wall portions 25 (25F, 25B) are configured to include a plurality of locking claws 41 protruding outward so that the connecting wall portion 58 of the airbag cover 52 can be locked. Six locking claws 41 are formed on each opposing wall portion 25, and are arranged at positions that coincide with each other in the opposing direction of the opposing wall portions 25F and 25B, that is, in the front-rear direction. Each locking claw 41 extends outward from the upper end 25a of the opposing wall portion 25 in the front-rear direction, and is arranged on the inner peripheral side of the locking hole 59a at the time of locking, and the tip of the neck portion 42 And a locking piece 43 that extends downward from the locking claw 41 and restricts the locking claw 41 from coming off from the locking hole 59a.

  Each latching claw 41 is provided with a plate-like claw reinforcing rib 45 extending in the front-rear direction, which is the opposing direction of the opposing wall portion 25, at the center in the left-right direction on the upper surface 41a side. The claw reinforcing rib 45 has a thickness dimension t (see FIG. 6) that can restrict the bending of the neck portion 42 upward, and an outer edge (edge on the front end side away from the peripheral wall portion 24) 45a. It is connected to the surface 43at side, and an inner edge (an edge on the original side that is the peripheral wall portion 24 side) 45b is connected to an inner edge (upper end inner peripheral surface) 24b side of the peripheral wall portion 24 (opposing wall portion 25), It has a substantially triangular plate shape that protrudes upward from the upper end 24a of the portion 24 (see FIG. 8).

  These claw reinforcing ribs 45 are provided on the lower end 59c of the locked wall portion 59 of the connecting wall portion 58 when the connecting wall portion 58 of the airbag cover 52 is disposed on the outer peripheral side of the peripheral wall portion 24. A guide surface 46 b that can be guided to the outer peripheral surface 43 a side of the portion 43 is provided on the upper surface 46. The guide surface 46b is disposed in an area extending outward from the upper end (substantially triangular plate-shaped top portion) 46a of the upper surface 46 of the claw reinforcing rib 45 as an inclination descending outward, and has an arcuate upper end 46a. Is arranged so as to be displaced from the neck portion 42 toward the inside of the case 21.

  Furthermore, in the case of the embodiment, as shown in FIGS. 5 to 7, a plurality of case reinforcing ribs 37 are formed on the outer surface 21 a side of the case 21 so as to increase the rigidity of the case 21. The case reinforcing ribs 37 are arranged along the front-rear direction, in other words, the claw extending direction ribs 38 arranged in parallel with the belt-like claw reinforcing ribs 45, and in other words, the claw extending direction ribs 38 along the left and right direction. And a claw orthogonal direction rib 39 arranged in a direction orthogonal to the claw reinforcing rib 45. In the case of the embodiment, the claw extending direction ribs 38 are formed in six (6 rows) along the front-rear direction, and the claw orthogonal direction ribs 39 are formed in four (4 rows) along the left-right direction. Is formed.

  In the case of the embodiment, the claw extension direction ribs 38 are arranged on the outer sides of the peripheral wall portion 24 and the bottom wall portion 22 of the case 21 so as to connect the arrangement positions of the pair of locking claws 41 arranged opposite to each other. It protrudes from the surface 21a.

  Further, the peripheral wall portion 24 of the case 21 includes a main body portion 28 that is continuous with the upper surface 22 f of the bottom wall portion 22, an outer wall portion 29 that is disposed on the entire outer periphery of the upper end 28 a of the main body portion 28, and the main body portion 28. The connecting rib 31 is configured to connect the outer peripheral side and the inner peripheral side of the outer wall portion 29.

  The connecting rib 31 includes a horizontal plate portion 32 disposed near the middle in the vertical direction of the outer wall portion 29 so as to block between the main body portion 28 and the outer wall portion 29, and the main body portion on the upper and lower surfaces of the horizontal plate portion 32. A vertical plate portion 33 having an upper vertical plate portion 34 and a lower vertical plate portion 35 that extend outward from the belt 28 in a belt shape and continue to the outer wall portion 29. In the case of the embodiment, the horizontal plate portion 32 is disposed substantially parallel to the bottom wall portion 22.

  The lower vertical plate portion 35 of the connecting rib 31 is formed from upper end portions 38 a and 39 a of the claw extension direction rib 38 and the claw orthogonal direction rib 39.

  Further, the upper vertical plate portion 34 of the connecting rib 31 is disposed so as to overlap the lower vertical plate portion 35, respectively. That is, each upper vertical plate portion 34 is disposed so as to overlap with the lower vertical plate portion 35 in the vertical direction in a plan view of the case 21. And the nail | claw reinforcement rib 45 is extendedly provided from the upper part of each upper vertical board part 34, and is arrange | positioned.

  Further, a bracket portion 48 having a connecting hole 49a penetrating in the up-down direction is provided projecting outward from the side wall portions 26 facing each other in the left-right direction in the peripheral wall portion 24 of the case 21. The bracket portion 48 is configured to have a substantially rectangular plate-shaped fixing piece portion 49 that is flush with the upper end 26a of the side wall portion 26 (see FIGS. 4 and 5) and protrudes from the outer wall portion 29 outward in the left-right direction. The fixing piece portion 49 is connected to the fixing wall portion 61 of the connecting wall portion 58 of the airbag cover 52 by a screw (tapping screw) 70 as fixing means (see FIG. 2). The connecting hole 49a penetrates in the vertical direction to be inserted.

  As shown in FIGS. 5 and 7, the fixing piece portion 49 is provided with a belt-like support reinforcing rib 50 on each of the front and rear edges on the lower surface side. These support reinforcing ribs 50, 50 are formed by connecting two claw orthogonal direction ribs 39 adjacent to each other on the center side.

  In assembling the airbag apparatus M of the embodiment, first, the airbag 10 is folded with the retainer 13 disposed therein so that the bolts 15 protrude from the mounting holes 11a, and further, the airbag apparatus M is not collapsed. The folded airbag 10 is wrapped with a wrapping wrapping sheet 9 (see FIG. 3).

  The folded airbag 10 is housed on the bottom wall portion 22 of the case 21 with each bolt 15 protruding from the through-hole 23a, and the body portion 19 of the inflator 18 is passed through the insertion hole 22a from below to the case 21. The bolts 15 protruding from the bottom wall portion 22 are inserted into the mounting holes 20a of the flange portion 20 while being inserted into the flange portions 20, and the bolts 15 are inserted into the through holes 66a of the support seat 66 of the mounting bracket 65. If the nuts 16 are fastened to the respective bolts 15, the airbag 10, the inflator 18, and the mounting bracket 65 can be attached and fixed to the case 21.

  Thereafter, the connecting wall portion 58 of the airbag cover 52 is pushed downward from above with respect to the peripheral wall portion 24 of the case 21, and the locking hole peripheral edge 59 b of the connecting wall portion 58 is locked to the locking claw 41. The airbag cover 52 is assembled to 21.

  At this time, as shown in FIG. 10, when the connecting wall portion 58 of the airbag cover 52 is pushed downward from above the peripheral wall portion 24 of the case 21, the locked wall portions 59 </ b> F and 59 </ b> B of the connecting wall portion 58. The lower end 59c is brought into contact with the guide surface 46b of the claw reinforcing rib 45 protruding upward from the upper end 24a of the peripheral wall portion 24 itself before it hits the upper end 24a of the peripheral wall portion 24. Therefore, if the locked wall portions 59F and 59B of the connecting wall portion 58 are further pushed down, they are pushed and spread on the guide surface 46b as shown in FIG. The locking piece portion 43 and the neck portion 42 are sequentially inserted into the locking hole 59a, and the locking piece portion 43 is inserted into the locked wall as shown in FIG. 11B. The assembling operation can be completed by disposing the portions 59F and 59B on the peripheral edge 59b on the outer peripheral side.

  That is, in the case of the embodiment, when the airbag cover 52 is assembled to the case 21, the lower end 59c of the locked wall portions 59F and 59B in the connecting wall portion 58 is likely to hit the guide surface 46b, so that the assemblability is good. It becomes.

  Next, if the screw 70 is screwed into the fastening hole 62b through the connecting hole 49a and the left and right fastening seats 62 of the airbag cover 52 are fixed to the left and right bracket portions 48 of the case 21, the airbag device M is secured. Can be assembled.

  After that, if the bolt 7 is screwed into the nut 68 of the mounting bracket 65 and the mounting bracket 65 is mounted and fixed to the bracket 5 from the instrument panel in-hose 3, the airbag apparatus M can be mounted on the vehicle.

  At this time, a part (not shown) of the instrument panel 1 is also fixed to a predetermined part on the vehicle body side by using fixing means such as a bolt or a clip.

  In the above description, the case where the airbag device M is mounted on the vehicle after the airbag cover 52 made of the instrument panel 1 is assembled to the case 21 has been described. However, the airbag 10, the inflator 18, and When the mounting bracket 65 is mounted and fixed, the airbag apparatus main body is assembled, and when the mounting bracket 65 is fixed to the vehicle body side with the bolts 7 fixed, the airbag cover 52 including the instrument panel 1 is assembled to the case 21, and the instrument panel 1 A part (not shown) may be assembled on the vehicle body side, and the mounting operation of the airbag device M on the vehicle may be completed substantially simultaneously with the assembly of the airbag device M.

  Further, the mounting bracket 65 of the airbag apparatus main body may be bolted to the vehicle with the bolt 7 while the airbag cover 52 of the instrument panel 1 previously attached to the vehicle body side is assembled to the case 21 of the airbag apparatus main body. In this case, the peripheral wall portion 24 of the case 21 is raised so as to be inserted into the connecting wall portion 58, and the airbag cover 52 is locked by the relative downward movement with respect to the case 21. The Rukoto.

  If the inflation gas is discharged from the gas discharge port 19a of the inflator 18 after the installation of the airbag apparatus M to the vehicle is completed, the airbag 10 expands and the ceiling wall portion 53 surrounded by the connecting wall portion 58 is obtained. The upper part is pushed upward, the expected breakage part 56 is broken, the door parts 54F and 54B are opened, the front passenger's occupant is expanded while being expanded forward, and the expansion is completed. It becomes. At this time, the airbag cover 52 is strongly pulled upward together with the ceiling wall portion 53 and the connection wall portion 58 so that the airbag cover 52 is strong against the neck portion 42 of each locking claw 41 located on the inner peripheral side of the locking hole 59a. A pressing force F (see FIGS. 1 and 11) acts. However, since each claw reinforcing rib 45 is disposed so as to extend to the inner edge 24b of the peripheral wall portion 24, the neck portion 42 has a large bending rigidity, and the locking claw 41 has a strength so that the bending of the neck portion 42 can be restricted. It is improving. For this reason, the locking claw 41 is stably deformed even when a large upward pressing force F acts on the neck portion 42, preventing the locking piece portion 43 from coming off from the locking hole 59 a. The airbag cover 52 can be locked.

  In the embodiment, the assembly of the airbag cover 52 to the case 21 and the strength of the locking claw 41 are easily achieved by the claw reinforcing rib 45 provided on the upper surface 41a of the locking claw 41. Yes.

  Therefore, the airbag apparatus M according to the embodiment improves the assembling property between the case 21 made of synthetic resin and the airbag cover 52 and improves the strength of the locking claw 41 of the case 21 with a predetermined claw reinforcing rib 45. This can be easily achieved with a simple configuration.

  And in embodiment, the latching claw 41 is arrange | positioned corresponding to the opposing position before and behind a pair of opposing wall part 25F, 25B. Further, the claw extending direction ribs 38 of the band-like case reinforcing ribs 37 arranged in parallel with the claw reinforcing ribs 45 are arranged so that the bending of the case 21 can be restricted, and the paired locking claws 41 are arranged to face each other. Projecting is provided on the outer surface 21 a of the peripheral wall portion 24 and the bottom wall portion 22 of the case 21 so as to connect each other. In the case of the embodiment, as described above, six claw extending direction ribs 38 are formed so as to extend in the front-rear direction corresponding to the number of the six locking claws 41.

  That is, in the embodiment, the claw extending direction rib 38 of the case reinforcing rib 37 is disposed so as to be continuous with the claw reinforcing rib 45 although it is on the outer surface side of the peripheral wall portion 24. Therefore, when the airbag 10 is inflated, the neck portion 42 of the locking claw 41 receives a strong tensile force (pressing force) F upward and bends the opposing wall portion 25 of the peripheral wall portion 24. The claw extension direction rib 38 can prevent the deformation against the bending deformation, and as a result, the bending deformation of the opposing wall portion 25 of the peripheral wall portion 24 that displaces the locking claw 41 can be prevented appropriately. The detachment of the locking piece 43 from the locking hole 59a can be prevented more stably.

  Furthermore, in the airbag apparatus M of the embodiment, the case reinforcing rib 37 is arranged in a direction orthogonal to the claw extension direction rib 38 in addition to the claw extension direction rib 38 that connects the arrangement positions of the pair of locking claws 41. A plurality of (four in the embodiment) nail orthogonal direction ribs 39 are provided.

  Therefore, in the embodiment, the peripheral wall portion 24 and the bottom wall portion 22 of the case 21 are provided with further rigidity by the plurality of claw extension direction ribs 38 and the claw orthogonal direction ribs 39 of the case reinforcing ribs 37 arranged in a lattice shape. As a result, deformation of the case 21 itself when the airbag 10 is inflated can be accurately prevented, and bending deformation of the peripheral wall portion 24 and the bottom wall portion 22 that can displace the locking claws 41 can be prevented accurately. Further, it is possible to more stably prevent the locking piece 43 from coming off from the locking hole 59a.

  Furthermore, in the embodiment, the peripheral wall portion 24 of the case 21 includes a main body portion 28 that is continuous with the upper surface 22f of the bottom wall portion 22, and an outer wall portion 29 that is disposed on the entire outer periphery of the upper end 28a of the main body portion 28. The connecting rib 31 is configured to connect the outer peripheral side of the main body 28 and the inner peripheral side of the outer wall portion 29. The connecting rib 31 includes a horizontal plate portion 32 disposed near the middle in the vertical direction of the outer wall portion 29 so as to block between the main body portion 28 and the outer wall portion 29, and the main body portion on the upper and lower surfaces of the horizontal plate portion 32. A vertical plate portion 33 having an upper vertical plate portion 34 and a lower vertical plate portion 35 extending outward from the belt 28 in a band shape and continuing to the outer wall portion 29. And the lower vertical board part 35 of the connection rib 31 is formed from the upper end parts 38a and 39a of the nail extension direction rib 38 and the nail orthogonal direction rib 39, and the upper vertical board part 34 of the connection rib 31 is a lower vertical board, respectively. The claw reinforcing ribs 45 are disposed so as to overlap above the portion 35, and are extended from the upper portion of the upper vertical plate portion 34.

  Therefore, in the embodiment, the upper end 24 a of the peripheral wall portion 24 is configured by the upper end 28 a of the main body portion 28 connected by the connecting rib 31 and the outer wall portion 29, and the connecting rib 31 is vertically connected to the horizontal plate portion 32. It is comprised from the board part 33. FIG. In other words, the portion between the upper and lower vertical plate portions 33 of the horizontal plate portion 32 becomes the meat stealing recess 36 (36U, 36D) (see FIGS. 4 to 7), and the weight of the case 21 can be further reduced. it can.

  Of course, even if such a meat stealing recess 36 is provided, the lower vertical plate portion 35 of the connecting rib 31 is formed from the upper end portions 38a, 39a of the claw extending direction rib 38 and the claw orthogonal direction rib 39, and connected. The upper vertical plate portion 34 of the rib 31 is disposed so as to overlap the upper portion of the lower vertical plate portion 35, and the claw reinforcing rib 45 is disposed so as to extend from the upper portion of the upper vertical plate portion 34. Therefore, the ribs 38, 39, 34, 35, 45 are arranged so as to be aligned in a lattice shape, and the entire bending rigidity of the case 21 including the locking claws 41 is arranged. Will be secured.

  Furthermore, in the embodiment, the fixing wall portion 61 of the connecting wall portion 58 of the airbag cover 52, the side wall portions 26 facing each other in the direction orthogonal to the opposing direction of the pair of opposing wall portions 25 in the peripheral wall portion 24 of the case 21, A bracket portion 48 having a connecting hole 49a penetrating in the vertical direction so as to be connectable by a screw 70 is provided to project outward, and the bracket portion 48 is provided on both edges on the lower surface side of the claw orthogonal direction ribs 39, 39, respectively. A belt-like support reinforcing rib 50 is provided and arranged.

  Therefore, in the embodiment, the airbag cover 52 is also connected to the bracket portion 48 extending from the side wall portion 26 of the case 21 as a fixing means in addition to the connection with the pair of opposing wall portions 25 by the locking claw 41 locking. As a result, the ceiling wall portion 53 of the airbag cover 52 is connected to the door portion 54 with the locked wall portion 59 and the fixing wall portion 61 of the connecting wall portion 58 interposed therebetween. The surrounding four sides are connected to the substantially square cylindrical peripheral wall portion 24 of the case 21 by the locking claw 41 and the screw 70 as the fixing means, and the door portion is opened when the door portion 54 of the airbag cover 52 is opened. The ceiling wall 53 around 54 becomes difficult to move upward, and the door 54 can be opened quickly by breaking the planned break portion 56.

  Of course, the bracket portion 48 is reinforced by the supporting and reinforcing ribs 50 connected to the claw orthogonal direction ribs 39 arranged on the peripheral wall portion 24 and the bottom wall portion 22 of the case 21, and the strength is ensured without increasing the weight. Has been.

  In the embodiment, the fastening seat 62 of the airbag cover 52 that is fixed to the bracket portion 48 uses the fixing wall portion 61 as a fixing wall portion 61 in the left and right portions of the connecting wall portion 58 of the airbag cover 52. However, the fastening seat 62 may be provided so as to extend from the ceiling wall portion 53 away from the connecting wall portion 58.

  Further, in the embodiment, when the locking claw 41 is disposed on the opposing wall portion 25 facing in the front-rear direction of the case 21 with the side where the hinge portion 55 of the door portion 54 is disposed corresponding to the front-rear edge side. However, when the side of the door portion 54 on which the hinge portion 55 is disposed is the edge side in the left-right direction of the door portion 54, the locked wall portion 59 provided with the locking hole 59 a on the airbag cover 52 side. It is desirable to dispose the locking claws 41 between the opposing wall portions of the portions facing each other in the left-right direction. Of course, you may set the opposing wall part which provides a latching claw irrespective of the direction where a hinge part is arrange | positioned.

  Further, when the bracket portion 48 is not provided, locking claws are respectively disposed on, for example, two pairs of wall portions facing the front, rear, left, and right of the substantially square cylindrical peripheral wall portion 24 so that the airbag cover 52 side is provided. A locking hole facing the locking claw may be provided in the connection wall portion 58 having a substantially rectangular tube shape. Incidentally, in this case, at the time of assembly, the opposing wall portions of the connecting wall portion 58 are guided by the guide surface 46b of the claw reinforcing rib 45 so that they are easily expanded in four directions. It is desirable to provide a slit or the like.

  Further, in the embodiment, the airbag device M for the passenger seat has been described. However, the present invention is not limited to the airbag device for the passenger seat, and is provided on the case side in a synthetic resin case. The present invention may be applied to an air bag device for a driver's seat or the like as long as the air bag device is configured to lock and assemble an air bag cover made of synthetic resin by using the locking claws.

10 ... Airbag, 18 ... Inflator,
21 ... Case, 21a ... Outer surface, 21b ... Opening, 22 ... Bottom wall part, 24 ... Peripheral wall part, 25 (25F, 25B) ... Opposite wall part, 26 (26L, 26R) ... Side wall part, 28 ... Main body part, 29 ... Outer wall portion, 31 ... Connecting rib, 32 ... Horizontal plate portion, 33 ... Vertical plate portion, 34 ... Upper vertical plate portion, 35 ... Lower vertical plate portion, 36 (36U, 36D) ... Meat stealing recess, 37 ... case reinforcing rib, 38 ... claw extension direction rib, 38a ... upper end, 39 ... claw orthogonal direction rib, 39a ... upper end,
41 ... locking claw, 41a ... upper surface, 42 ... neck, 43 ... locking piece, 43a ... outer peripheral surface, 43at ... upper end outer peripheral surface,
45 ... nail reinforcement ribs, 45a ... outer edge, 45b ... inner edge, 46 ... upper surface, 46b ... guide surface,
48 ... Bracket part, 49a ... Connection hole, 50 ... Supporting reinforcement rib,
52 ... Airbag cover, 53 ... Ceiling wall part, 54 (54F, 54B) ... Door part, 58 ... Connecting wall part, 59a ... Locking hole, 59c ... Lower end,
70 ... (fixing means / tapping screw) screw,
M ... (for passenger seat) Airbag device.

Claims (10)

An airbag device has an airbag, an inflator that supplies inflation gas to the airbag, a bottom wall portion, and a substantially square cylindrical peripheral wall portion that extends upward from the outer peripheral edge of the bottom wall portion. A case that holds and holds the inflator and the folded airbag, and a synthetic resin airbag cover that covers the airbag that is capable of projecting the airbag when inflated. And configured with,
The airbag cover covers the stored airbag, and has a ceiling wall portion having a door portion that is pushed and opened by the airbag when inflated, and extends downward from the periphery of the door portion to extend the case. A substantially rectangular tube-shaped connecting wall portion disposed on the outer peripheral side of the peripheral wall portion and connected to the peripheral wall portion,
A pair of opposing wall portions opposed to the peripheral wall portion each include a plurality of locking claws protruding outward so as to be able to lock the connecting wall portion,
The connecting wall portion of the airbag cover is configured to include a plurality of locking holes for inserting the locking claws so as to be locked to the locking claws ,
When assembling the case and the airbag cover, the connecting wall portion of the airbag cover is pushed downward from above with respect to the peripheral wall portion of the case, and the connecting wall portion of the airbag cover is A method of manufacturing an airbag device that is disposed on the outer peripheral side of a peripheral wall portion of a case and is assembled and manufactured so as to lock the connecting wall portion to the locking claw inserted into the locking hole ;
The case is configured as a synthetic resin,
The locking claw is
A neck that extends outward from the upper end of the opposing wall and is disposed on the inner peripheral side of the locking hole at the time of locking;
A locking piece that extends downward from the tip of the neck and restricts the locking claw from coming off from the locking hole;
With
On the upper surface of the locking claw, as the opposing walls plate extending along the opposing direction of, and can restrict bending upward the neck, and a connecting wall portion of the airbag cover of the case A claw reinforcing rib provided with a guide surface on the top surface capable of guiding the lower end of the connecting wall portion to the outer peripheral side of the locking piece portion of the locking claw when assembled to be arranged on the outer peripheral side of the peripheral wall portion, A method for manufacturing an airbag device , wherein the airbag device is disposed so as to protrude upward from an upper end of the airbag and extend to an inner edge of the peripheral wall portion . The locking claws are disposed corresponding to the opposing positions of the pair of opposing wall portions,
The case in which the band-shaped case reinforcing ribs arranged in parallel with the claw reinforcing ribs connect the arrangement positions of the pair of engaging claws arranged opposite to each other so that bending of the case can be restricted. The method for manufacturing an airbag device according to claim 1, wherein the airbag device is protruded from outer surfaces of the peripheral wall portion and the bottom wall portion. The case reinforcing rib includes a plurality of claw orthogonal ribs arranged in a direction orthogonal to the claw extending direction rib in addition to the claw extending direction rib connecting the arrangement positions of the pair of locking claws. The manufacturing method of the airbag apparatus of Claim 2 characterized by the above-mentioned. A peripheral wall portion of the case includes a main body portion that is continuous with the upper surface side of the bottom wall portion, an outer wall portion that is disposed on the entire outer periphery of the upper end of the main body portion, an outer peripheral side of the main body portion, and the outer wall. A connecting rib that connects the inner peripheral side of the part,
A horizontal plate portion disposed near the middle of the outer wall portion in the vertical direction so as to block the connection rib between the main body portion and the outer wall portion, and the main body portion at the upper and lower surfaces of the horizontal plate portion. A vertical plate portion having an upper vertical plate portion and a lower vertical plate portion extending outwardly in a band shape and continuing to the outer wall portion.
The lower vertical plate portion of the connecting rib is formed from upper ends of the claw extension direction rib and the claw orthogonal direction rib,
The upper vertical plate portions of the connecting ribs are respectively arranged so as to overlap above the lower vertical plate portions,
The method for manufacturing an airbag device according to claim 3, wherein the claw reinforcing rib is provided so as to extend from an upper portion of the upper vertical plate portion. A bracket portion having a connecting hole penetrating in a vertical direction so as to be connectable by the air bag cover and the fixing means between the side wall portions facing each other in the direction orthogonal to the opposing direction of the pair of opposing wall portions in the peripheral wall portion of the case. , Projecting outward,
5. The bracket according to claim 3, wherein the bracket portion is provided on both edges on the lower surface side by providing band-like support reinforcing ribs continuous from the ribs in the claw orthogonal direction. Manufacturing method of airbag apparatus. A substantially rectangular parallelepiped having an airbag, an inflator for supplying inflation gas to the airbag, a bottom wall portion and a substantially square cylindrical peripheral wall portion extending upward from an outer peripheral edge of the bottom wall portion, and having an upward opening A shape, a case for storing and holding the inflator and the folded airbag, and a synthetic resin airbag cover for covering the airbag storing the airbag at the time of inflation,
The airbag cover covers the stored airbag, and has a ceiling wall portion having a door portion that is pushed and opened by the airbag when inflated, and extends downward from the periphery of the door portion to extend the case. A substantially rectangular tube-shaped connecting wall portion disposed on the outer peripheral side of the peripheral wall portion and connected to the peripheral wall portion,
A pair of opposing wall portions opposed to the peripheral wall portion each include a plurality of locking claws protruding outward so as to be able to lock the connecting wall portion,
The airbag device, wherein the connecting wall portion of the airbag cover includes a plurality of locking holes into which the locking claws are inserted so as to be locked to the locking claws,
The case is configured as a synthetic resin,
The locking claw is
A neck that extends outward from the upper end of the opposing wall and is disposed on the inner peripheral side of the locking hole at the time of locking;
A locking piece that extends downward from the tip of the neck and restricts the locking claw from coming off from the locking hole;
With
On the upper surface side, the as opposing walls plate extending along the opposing direction of the regulation can be nails reinforcing ribs bending upward the neck, it is provided,
The pawl reinforcing ribs protrude from the displaced inwardly disposed the upper end of the casing from the neck portion toward the outer side, down inclined the upper surface, the is provided, upwardly from the upper end of the peripheral wall portion And the airbag apparatus is arrange | positioned so that it may extend to the inner edge of the said surrounding wall part. The locking claws are disposed corresponding to the opposing positions of the pair of opposing wall portions,
The case in which the band-shaped case reinforcing ribs arranged in parallel with the claw reinforcing ribs connect the arrangement positions of the pair of engaging claws arranged opposite to each other so that bending of the case can be restricted. The airbag device according to claim 6 , wherein the airbag device is protruded from the outer surface of the peripheral wall portion and the bottom wall portion. The case reinforcing rib includes a plurality of claw orthogonal ribs arranged in a direction orthogonal to the claw extending direction rib in addition to the claw extending direction rib connecting the arrangement positions of the pair of locking claws. The airbag device according to claim 7 , wherein the airbag device is provided. A peripheral wall portion of the case includes a main body portion that is continuous with the upper surface side of the bottom wall portion, an outer wall portion that is disposed on the entire outer periphery of the upper end of the main body portion, an outer peripheral side of the main body portion, and the outer wall. A connecting rib that connects the inner peripheral side of the part,
A horizontal plate portion disposed near the middle of the outer wall portion in the vertical direction so as to block the connection rib between the main body portion and the outer wall portion, and the main body portion at the upper and lower surfaces of the horizontal plate portion. A vertical plate portion having an upper vertical plate portion and a lower vertical plate portion extending outwardly in a band shape and continuing to the outer wall portion.
The lower vertical plate portion of the connecting rib is formed from upper ends of the claw extension direction rib and the claw orthogonal direction rib,
The upper vertical plate portions of the connecting ribs are respectively arranged so as to overlap above the lower vertical plate portions,
The airbag device according to claim 8 , wherein the claw reinforcing rib is provided so as to extend from an upper portion of the upper vertical plate portion. A bracket portion having a connecting hole penetrating in a vertical direction so as to be connectable by the air bag cover and the fixing means between the side wall portions facing each other in the direction orthogonal to the opposing direction of the pair of opposing wall portions in the peripheral wall portion of the case. , Projecting outward,
10. The bracket according to claim 8 , wherein the bracket portion is provided with band-like support reinforcing ribs that are continuous with the ribs in the claw orthogonal direction on both edges on the lower surface side. Airbag device.

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