JP5346752B2 - Method for manufacturing case body of airbag device, case body of airbag device, and airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce manufacturing cost of a case body of an airbag device for an occupant on a front passenger seat. <P>SOLUTION: The case body 4 includes a case body 11 and a pair of reinforcing plates 12. The case body 11 includes a longitudinal plate part 17 and a short plate part 18. A folded piece 22 extended from the short plate part 18 is bent to be overlapped with the outside of the longitudinal plate part 17. A reinforcing plate 12 having large strength is arranged to be overlapped with the inside of the longitudinal plate part 17. The reinforcing plate 12, the longitudinal plate part 17 and the folded piece 22 are joined by an end part joining part 31. The end part joining part 31 presses a portion provided with an opening 38 in the longitudinal plate part 17 from the inside and joins the portion by caulking. There are no joining works in a short surface of the case body 4, the manufacturing cost can be reduced and a shock absorbing characteristic can be easily improved. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to, for example, a method for manufacturing a case body of an airbag device for a passenger on a passenger seat provided in an instrument panel of an automobile, a case body of an airbag device, and an airbag device.

  2. Description of the Related Art Conventionally, an airbag device for a passenger in a passenger seat disposed on an instrument panel of an automobile is known. The airbag device includes a box-shaped case body having an opening on the upper side, and a folded airbag and an inflator for injecting gas for inflating the airbag are accommodated inside the case body. In addition, the opening on the upper side of the case body is covered with a cover body attached along the instrument panel. When the automobile collides, the airbag is inflated by injecting gas from the inflator, the tear line formed on the cover body is broken by the inflation pressure of the airbag to form the inflation outlet, and the airbag is released from the inflation outlet. It is designed to reduce the impact on the occupant.

  The case body is a member that receives a large force that the airbag deploys when the airbag is deployed, and needs to be firmly attached to the vehicle body side member, and the cover body needs to be firmly held. is there. In this regard, a structure is known in which a metal plate is press-molded to form a housing portion, and a reinforcing frame is combined with the outer peripheral portion of the housing portion (see, for example, Patent Document 1). In this configuration, the housing portion has the front, rear, left and right side walls raised from the bottom, bent the overlapping portions formed continuously on the left and right side walls, which are side walls having large longitudinal dimensions, and the overlapping portions have the longitudinal dimensions. It is configured in a box shape by overlapping and fitting on small front and rear side walls. Further, the reinforcing frame includes two frame pieces arranged along the outer peripheral side of the housing part, and an intermediate part of these frame pieces is engaged with the protrusions provided on the left and right side walls of the housing part. The front and rear end portions of the piece are joined to each other on the front and rear side walls having a small longitudinal dimension, are formed in a frame shape, and are connected to the housing portion.

JP 2008-13075 A (Page 5-6, FIGS. 1 to 7)

  As described above, in the conventional configuration, there are many parts processing and alignment processes, and connection work from four directions of the housing portion is required, so that it is not easy to reduce the manufacturing cost. Further, since there is an attachment structure such as fitting on the four side walls of the housing part, it is not easy to adjust the shock absorption characteristics due to deformation of the case body.

  The present invention has been made in view of the above points, and a method of manufacturing a case body of an airbag device, a case body of an airbag device, and an airbag device capable of easily realizing appropriate strength and reducing manufacturing costs. The purpose is to provide.

  The method of manufacturing a case body of an airbag device according to claim 1 is a method of manufacturing a case body of an airbag device that constitutes a storage portion that stores an airbag that is inflated and deployed by introducing gas from a folded state. A case body made of a metal plate and a pair of reinforcing plates made of a metal plate having a strength higher than that of the case body, and the case body surrounds a rectangular opening communicating with the storage portion. A pair of long plate portions are disposed along the longitudinal direction of the plate, a pair of short plate portions are disposed along the short direction of the opening, and the portions extending from the short plate portions are bent to form the long plate. A frame-shaped side wall portion is formed as a folded piece along the outer surface of the portion, the reinforcing plate is disposed in the storage portion along the inner surface of the longitudinal plate portion, and a die is disposed outside the folded piece. From the inside of the storage part toward this die Pressed with Ji, the sandwiching longitudinal plate portion at least between the reinforcing plate and said folded piece is intended to be joined by caulking.

  The method of manufacturing the case body of the airbag device according to claim 2 is the method of manufacturing the case body of the airbag device according to claim 1, wherein the longitudinal plate portion is previously provided with an opening at a position pressed by a punch, The reinforcing plate and the folded piece are caulked by direct contact.

  The case body of the airbag device according to claim 3 is a case body of an airbag device that constitutes a storage portion that stores an airbag that is inflated and deployed by introducing gas from a folded state, and is made of a metal plate. A case main body and a pair of reinforcing plates made of a metal plate having a strength higher than that of the case main body. The case main body surrounds the opening with a rectangular opening communicating with the storage portion, and the opening A pair of long plate portions arranged along the longitudinal direction of the pair, a pair of short plate portions arranged along the short direction of the opening, and a portion extending from the short plate portions are bent and long. A side wall provided with folded pieces along the outer surface of the hand plate portion, and the reinforcing plate is disposed in the storage portion along the inner surface of the longitudinal plate portion, and at least the reinforcing plate sandwiching the longitudinal plate portion And the folded piece projecting outward Those having a joint that is joined or tighten the.

  The case body of the airbag device according to claim 4 is the case body of the airbag device according to claim 3, wherein the longitudinal plate portion is provided with an opening at the position of the joint portion, and the reinforcing plate and the folded piece are directly connected to each other. It was squeezed by contact.

  The airbag device according to claim 5 is provided with a case body according to claim 3 or 4 provided with a cover support portion integrally projecting from a reinforcing plate, and a bag shape folded and stored in a storage portion of the case body. And an inflator attached to the case body for supplying gas to the airbag, and a cover body supported by the cover support portion and covering the opening of the case body.

  According to the method for manufacturing the case body of the airbag device according to claim 1, there is no joining operation at a position along the short side, and the joining operation is extended from the long plate portion and the short plate portion of the case body. Since the folded piece and the reinforcing plate are caulked and joined from the inside at a position along the longitudinal surface of the case body, the manufacturing cost can be reduced by reducing the number of joining steps and simplifying the joining equipment. Since the joining portions are concentrated at positions along the long plate portion and the shape of the short surface of the short plate portion can be simplified, the degree of freedom in design for improving the impact absorption characteristics of the short plate portion can be improved. The case body can be protected from the pressure when the airbag is deployed by the strong reinforcing plate.

  According to the method of manufacturing the case body of the airbag device according to claim 2, in addition to the effect of claim 1, the opening of the longitudinal plate portion serves as a guide, and the reinforcing plate having high strength is stably deformed, and the short plate The portion and the reinforcing plate can be stably caulked and joined. The long plate portion can be firmly joined to the short plate portion and the reinforcing plate by being sandwiched between the short plate portion and the reinforcing plate.

  According to the case body of the airbag device according to claim 3, there is no joining work at a position along the short side, and the joining work is a folded piece extending from the long plate portion and the short plate portion of the case body. And since a reinforcement board is performed by the caulking joining pressed from the inner side in the position along the longitudinal surface of a case main body, manufacturing cost can be reduced by reduction of a joining man-hour and simplification of joining equipment. Since the joining portions are concentrated at positions along the long plate portion and the shape of the short surface of the short plate portion can be simplified, the degree of freedom in design for improving the impact absorption characteristics of the short plate portion can be improved. The case body can be protected from the pressure when the airbag is deployed by the strong reinforcing plate.

  According to the case body of the airbag device according to claim 4, in addition to the effect of claim 3, the opening of the long plate portion serves as a guide, stably deforms the reinforcing plate having a high strength, and reinforces the short plate portion and the reinforcing member. The plate can be securely crimped and joined. The long plate portion can be firmly joined to the short plate portion and the reinforcing plate by being sandwiched between the short plate portion and the reinforcing plate.

  According to the airbag device of the fifth aspect, since the case body according to the third or fourth aspect is provided, the manufacturing cost of the airbag device can be reduced. The case body is protected from the pressure when the airbag is deployed by the reinforcing plate, and the cover body covering the folded airbag can be firmly supported by the cover support portion provided on the reinforcing plate.

It is explanatory drawing which shows the manufacturing process of one Embodiment of the manufacturing method of the case body of the airbag apparatus of this invention, (a) is sectional drawing of the II equivalent position of FIG. 3, (b) is (a). (C) is a step following (b), and (d) is a step following (c). It is sectional drawing which shows an airbag apparatus same as the above schematically. It is a perspective view of the case body of an airbag apparatus same as the above. It is a disassembled perspective view of the case body of an airbag apparatus same as the above. It is II sectional drawing of FIG. 3 of the case body of an airbag apparatus same as the above. It is a partial sectional view showing other embodiments of the present invention. FIG. 6 is a partial cross-sectional view showing still another embodiment of the present invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of a method for manufacturing a case body of an airbag device, a case body of an airbag device, and an airbag device according to the present invention will be described with reference to the drawings.

  In FIG. 2, reference numeral 1 denotes an airbag device. The airbag device 1 constitutes an airbag device 1 for a passenger in a passenger seat provided in an instrument panel portion 3 of an automobile. And the instrument panel part 3 is provided in the front part of the compartment over the substantially full length of the vehicle width direction, and the front window glass is located above the instrument panel part 3. And the airbag apparatus 1 is installed in the inside of this instrument panel part 3 facing the passenger | crew of a passenger seat. The airbag device 1 includes a case body 4, also called a retainer, an inflator 5 disposed at a lower portion of the case body 4, an airbag 6 folded and housed at the upper portion of the case body 4, and the airbag 6, that is, a cover body 8 that covers the opening 7 at the top of the case body 4. In the airbag device 1, the case body 4 is fixed to the vehicle body via a bracket (not shown). The inflator 5 has a cylindrical shape, for example, and rapidly reacts the propellant filled therein to supply gas into the airbag 6. Further, the cover body 8 is formed integrally with the instrument panel portion 3 which is an interior panel for automobiles or is attached to the instrument panel portion 3 as a separate body, and includes a front plate portion 8a and the front plate portion 8a. For example, it includes a mounting plate portion 8b that protrudes downward in a rectangular tube shape. In addition, a plurality of mounting holes 8c having a square hole shape are formed in the front and rear longitudinal surfaces of the mounting plate portion 8b along both sides, that is, the longitudinal direction. Further, a tear line (not shown), which is a weak portion as a planned fracture portion, is formed on the front plate portion 8a.

  When a vehicle equipped with the airbag device 1 collides, the gas supplied from the inflator 5 is introduced and the airbag 6 is inflated and expanded, that is, inflated, and the cover body 8 is brought into a tear line by the inflating pressure. The airbag 6 breaks out to form an inflation outlet, and the airbag 6 protrudes upward in a predetermined direction on the inflation side, and the airbag 6 is inflated and deployed forward of the occupant to protect the occupant. In the following description, the bulging side of the airbag 6 is the upper side (in the direction of arrow A shown in FIG. 2), and the front-rear direction and both-side directions when the airbag device 1 is attached to the automobile are described as the front-rear direction and both-side directions. However, the attachment state of the airbag device 1 is not limited to this configuration, and for example, the airbag device 1 can be attached in a state where the bulging side is directed to the rear upper side or the rear side.

  Next, the configuration of the case body 4 will be described in more detail.

  As shown in FIGS. 2 to 4, the case body 4 is formed by joining a case body 11 and a pair of reinforcing plates 12 joined to the case body 11.

  The case body 11 is formed by so-called press molding that punches and bends a metal plate, and has a box-like shape having a flat rectangular opening 7 on the upper side and a storage part 15 on the inner side. A rectangular bottom plate portion 16 and a pair of rectangular plate-like long plate portions 17 that are bent upward and bent up from the front and rear edges along the longitudinal direction of the bottom plate portion 16, and The bottom plate portion 16 includes a pair of rectangular plate-like short plate portions 18 that are bent upward and bent up from the edge portions of both end portions along the short direction. The bottom plate portion 16 is formed with an inflator disposition portion 21 for disposing the inflator 5 so as to be recessed downward. Furthermore, the front and rear portions of the upper side portion of each short plate portion 18 are each extended and bent to form a rectangular plate-like folded piece 22 that is superimposed on the outside of each long plate portion 17. In addition, a notch portion 23 is formed in a portion of each short plate portion 18 that is continuous with the lower side of each folded piece 22 so as to cut out each short plate portion 18 in the direction opposite to the extending direction of each folded piece 22. . The long plate portion 17, the short plate portion 18, and the folded piece 22 constitute a side wall portion 24 having a frame shape that surrounds the opening 7, that is, the storage portion 15, that is, a rectangular tube-shaped square tube.

  On the other hand, each reinforcing plate 12 is also called a mouse plate or a hook plate, and is formed by press-molding a metal plate that is thicker and larger in strength than the metal plate that constitutes the case body 11, and has a longitudinal plate portion. A reinforcing plate main body portion 26 having an elongated rectangular shape having substantially the same longitudinal dimension as 17 and having a width dimension, that is, a vertical dimension smaller than that of the longitudinal plate part 17, and an upper edge portion of the reinforcing plate main body part 26 And a plurality of hook portions 27 extending and bent at a predetermined interval. The reinforcing plate main body 26 is disposed inside the case main body 11, that is, overlapped with the longitudinal plate portion 17 on the storage portion 15 side, and the upper edge portion is disposed along the upper edge portion of each longitudinal plate portion 17. The case main body 11 is joined by an end joint 31 and an intermediate joint 32 as joints. The hook portion 27 protrudes upward and outward from the opening 7 of the case main body 11, and is bent so that the distal end side faces downward. These hook portions 27 are inserted into the mounting holes 8 c of the mounting plate portion 8 b of the cover body 8, and the cover body 8 is supported by the case body 4.

  Next, the configuration and manufacturing process of the end joint 31 will be described in more detail.

  The four end joint portions 31 are in the vicinity of the four corners of the side wall portion 24 of the case body 4, the long plate portion 17 of the case main body 11, the folded piece 22 extending from the short plate portion 18 of the case main body 11, and The reinforcing plate 12 is integrally caulked and joined, that is, the material is pushed in one direction and plastically joined, and the function of joining the reinforcing plate 12 to the case body 11, the long plate portion 17 and the short plate portion 18 This also serves to maintain the shape of the case main body 11 by joining them. Further, each end joint portion 31 is arranged not on the short surface on both sides of the case body 4 but on the front and rear longitudinal surfaces, and on the short surface on both sides of the case body 4, that is, on the short plate portion 18, the case body is provided. The structure of joining for forming 4 is not provided.

  The apparatus for forming the end joint portion 31 includes a punch 34 that has a convex portion 34a and advances and retreats in one direction, and a die 36 provided with a concave portion 36a that receives the convex portion 34a of the punch 34. Further, in the concave portion 36a of the die 36, an auxiliary concave portion 36b that is further provided from the concave portion 36a is formed at the corner portion.

  As a manufacturing process, first, as shown in FIG. 1A, the folded piece 22 of the short plate portion 18 is overlapped on the outside of the long plate portion 17, and the reinforcing plate 12 is overlapped on the inside of the long plate portion 17. That is, the long plate portion 17 is sandwiched between the folded piece 22 of the short plate portion 18 and the reinforcing plate 12. In this state, each of the long plate portions 17, the folded pieces 22 of the short plate portions 18, and the reinforcing plate 12 are each in the form of a flat plate, but the long plate portion 17 is previously provided with a circular opening 38 as a relief hole. The portion of the reinforcing plate 12 facing the opening 38 becomes the inner joint portion 41, and the portion of the folded piece 22 of the short plate portion 18 facing the opening 38 becomes the outer joint portion 42. And the convex part 34a of the punch 34 is arrange | positioned facing the inner side of the side wall part 24 of the case body 4, ie, the inner side of the inner side joining part 41, and the outer side of the side wall part 24 of the case body 4, ie, the outer side of the outer side joining part 42. Oppositely, the recess 36a of the die 36 is disposed.

  The punch 34 is then advanced toward the die 36. Then, as shown in FIG. 1 (b), plastic deformation starts so that the inner joint 41 enters the opening 38, and further, together with the inner joint 41 passing through the opening 38, as shown in FIG. 1 (c). The outer joint 42 is plastically deformed so as to enter the recess 36a of the die 36. This plastic deformation is deformed along the moving direction of the punch 34, and is also deformed in a direction intersecting with the moving direction of the punch 34 in accordance with the shape of the recess 36a of the die 36.

  Then, with the punch 34 moved to the forward limit, as shown in FIGS. 1 (d) and 5, the inner joint portion 41 and the outer joint portion 42 are pushed into the recess 36a and further to the auxiliary recess 36b of the die 36. Thus, the end joint portion 31 is formed, and the three metal plates are caulked and joined. In this embodiment, more specifically, while the inner joint portion 41 of the reinforcing plate 12 and the outer joint portion 42 of the folded piece 22 of the short plate portion 18 are joined in direct contact with each other, the longitudinal plate portion 17 is The reinforcing plate 12 is joined in a state of being sandwiched between the portion around the inner joint portion 41 and the portion around the outer joint portion 42 of the folded piece 22 of the short plate portion 18.

  And this process is performed at a total of four places, two places on the front and rear longitudinal surfaces, and each end joined portion 31 is formed.

  Further, each intermediate joint portion 32 is formed in the same manner as described above on the longitudinal surfaces of the case body 4 at the front and rear longitudinal surfaces and at the position where the folded piece 22 of the short plate portion 18 does not exist. And the reinforcing plate 12 are integrally caulked and joined. That is, the manufacturing process of the intermediate joint portion 32 is the same as the manufacturing process of the end joint portion 31 except that the folded piece 22 of the short plate portion 18, that is, the opening 38 does not exist.

  As described above, according to the present embodiment, both the end joint portion 31 and the intermediate joint portion 32 are configured by caulking joining at the longitudinal plate portion 17 of the case body 4, that is, the longitudinal surface, and the short plate portion 18. The manufacturing work of the case body 4 and the airbag apparatus 1 can be reduced by reducing the number of joining steps and simplifying the joining equipment. That is, the joining operation of the end joint portion 31 is performed by positioning the longitudinal plate portion 17 of the case body 11, the folded piece 22 extended from the short plate portion 18, and the reinforcing plate 12 along the longitudinal surface of the case body 11. The case body 4 and the air bag apparatus can be formed by reducing the number of man-hours and simplifying the joining equipment as compared with the configuration in which the joining operation is performed in one direction from the inside and the case body 4 needs to be joined in four directions. 1 manufacturing cost can be reduced.

  And since a junction part is gathered in the position along the longitudinal surface of the longitudinal plate part 17 including the intermediate junction part 32, and the shape of the short surface of the short board part 18 can be simplified, a passenger | crew is in the airbag apparatus 1. The degree of freedom in design for improving the buckling deformation characteristic, that is, the shock absorbing characteristic of the short plate portion 18 in the case of a collision can be improved, and the shock absorbing characteristic of the airbag device 1 can be easily improved.

  In addition, the reinforcing plate 12 with high strength is arranged inside the case main body 11 and is joined to the case main body 11 by caulking and joining from the side of the reinforcing plate 12 with high strength, so the reinforcing plate 12 is firmly attached to the case main body 11 In addition, the case body 4 can be protected from the pressure when the airbag 6 is deployed, and the cover body 8 can be firmly supported by the hook portion 27 provided on the reinforcing plate 12. Further, by the caulking joining that is pressed from the inside, the joined portions of the end joined portion 31 and the intermediate joined portion 32 do not protrude into the storage portion 15 of the case body 4, and the joined portion can be prevented from interfering with the airbag 6.

  Further, the end joint portion 31 combines the function of connecting the long plate portion 17 and the short plate portion 18 of the case body 11 to form the outer periphery, and the function of joining the case body 11 and the reinforcing plate 12. Therefore, compared with a structure having a separate structure, there are fewer parts processing and alignment processes, and the manufacturing cost can be easily reduced.

  Further, the longitudinal plate portion 17 is sandwiched between the folded piece 22 of the short plate portion 18 and the reinforcing plate 12, and the longitudinal plate portion 17 is provided with an opening 38 in advance at a position pressed by the punch 34, and the reinforcing plate 12 And the folded piece 22 are in direct contact and caulked, the opening 38 of the long plate portion 17 serves as a guide, stably deforms the strong reinforcing plate 12, and stabilizes the short plate portion 18 and the reinforcing plate 12. It can be joined by caulking. The long plate 17 can be firmly joined to the short plate 18 and the reinforcing plate 17 by being sandwiched between the folded piece 22 of the short plate 18 and the reinforcing plate 17.

  In this way, the airbag device 1 for the passenger on the passenger seat provided with the case body 4 having a long rectangular shape on both sides is secured to the cover body 8 while ensuring the necessary strength while reducing the manufacturing cost. In addition, it is possible to provide a suitable configuration that the impact absorption characteristics can be easily improved.

  In the above embodiment, as shown in FIG. 6, the opening 38 of the longitudinal plate portion 17 is formed relatively large, and the portion around the opening 38 of the reinforcing plate 12 is a flat portion that does not pass through the opening 38. In particular, the embossed surface portion 44 that contacts the folded piece 22 of the short plate portion 18 can also be formed.

  In addition, as shown in FIG. 7, the opening 38 that is an escape hole is not formed in the long plate portion 17, but the three metal plates of the long plate portion 17, the folded piece 22 of the short plate portion 18, and the reinforcing plate 12 are provided. It is also possible to caulk and join all three directly.

  Moreover, each member which comprises the airbag apparatus 1 can take an appropriate structure. For example, a mid retainer that partitions the airbag 6 and the inflator 5 may be attached to the case body 4. Further, the inflator 5 can be formed in a disk shape and can be fixed so as to fit into a circular hole formed in the bottom plate portion 16. As the inflator 5, various inflators such as the above-described combustion type (pyro type), a stored type that compresses and stores gas, and a hybrid type that combines these can be used.

  Furthermore, although each said embodiment demonstrated the airbag apparatus 1 for passenger seat passenger | crew of the instrument panel part 3, it is not restricted to this structure, For example, it installs in places other than the instrument panel part 3 of a motor vehicle. The present invention can also be applied to an airbag apparatus.

  The present invention can be applied, for example, to an airbag device for a passenger on a passenger seat provided in an instrument panel of an automobile.

DESCRIPTION OF SYMBOLS 1 Airbag apparatus 4 Case body 5 Inflator 6 Airbag 7 Opening part 8 Cover body
11 Case body
12 Reinforcing plate
15 compartment
17 Longitudinal plate
18 Short plate
22 Folded piece
24 Side wall
31 End joint as joint
34 Punch
36 die
38 opening

Claims (5)

A method of manufacturing a case body of an airbag device that constitutes a storage unit that stores an airbag that is inflated and deployed by introducing gas from a folded state,
Using a metal plate case body and a pair of reinforcing plates made of a metal plate that is stronger than the case body,
The case body surrounds a rectangular opening communicating with the storage portion, a pair of long plate portions are disposed along the longitudinal direction of the opening, and a pair of short plates along the short direction of the opening. Place the hand plate part, bend the part extended from the short plate part and configure the frame-shaped side wall part as a folded piece along the outer surface of the long plate part,
The reinforcing plate is disposed in the storage portion along the inner surface of the longitudinal plate portion,
A die is arranged outside the folded piece, pressed against the die from the inside of the storage portion with a punch, and at least the reinforcing plate and the folded piece are crimped and joined with the longitudinal plate portion interposed therebetween. A method for manufacturing a case body of an airbag device. The manufacturing method for a case body of an airbag device according to claim 1, wherein an opening is provided in advance in the longitudinal plate portion at a position pressed by a punch, and the reinforcing plate and the folded piece are directly brought into contact and caulked. Method. A case body of an airbag device that constitutes a storage portion that stores an airbag that is inflated and deployed by introducing gas from a folded state,
A metal plate case main body and a pair of reinforcing plates made of a metal plate that is stronger than the case main body,
The case main body has a rectangular opening communicating with the storage portion, a pair of long plate portions that surround the opening and are arranged along the longitudinal direction of the opening, and the short direction of the opening. A pair of short plate portions disposed along the side walls, and side wall portions provided with folded pieces along the outer surface of the long plate portion by bending a portion extending from these short plate portions,
The reinforcing plate is disposed in the storage portion along the inner surface of the longitudinal plate portion,
A case body of an airbag device, comprising: a joint portion that is caulked and joined in a direction in which at least the reinforcing plate and the folded piece protrude outwardly with the longitudinal plate portion interposed therebetween. The case of the airbag device according to claim 3, wherein the longitudinal plate portion is provided with an opening at a position of the joint portion, and the reinforcing plate and the folded piece are directly contacted and crimped. The case body according to claim 3 or 4, further comprising a cover support portion integrally projecting from the reinforcing plate,
A bag-like airbag that is folded and stored in the storage part of the case body;
An inflator attached to the case body for supplying gas to the airbag;
An air bag apparatus comprising: a cover body supported by the cover support section and covering an opening of the case body.

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