JP5215245B2 - Bag cover for airbag device - Google Patents

Description

  The present invention relates to a bag cover of an airbag device that deploys a bag body by gas pressure when an impact is input.

  As a vehicle airbag device, a bag body that is expanded by gas pressure at the time of impact input is folded into a long rod shape, and the bag body is attached to the side of the vehicle body together with a bag cover that covers the outer area of the bag body on the vehicle interior side. Is known (for example, see Patent Document 1).

  The airbag device described in Patent Document 1 is an airbag device that is disposed on the inner side surface of a side door of a vehicle and that is deployed between a door and an occupant to protect the occupant during a side collision or the like, and is folded The bag body is accommodated in a retainer that opens upward, and is attached to the door panel via the retainer. The bag cover is attached to the door panel together with the retainer so as to cover the upper portion of the retainer opening.

  The bag cover is provided with a lid portion surrounded by a thin break guide portion, and the lid portion is provided on the side away from the vehicle body panel in the lid portion by breaking the break guide portion when the bag is deployed. With the hinge portion as a rotation center, the side close to the vehicle body panel jumps up as a free end portion, and an opening for opening the bag body is formed.

JP 2008-213621 A

  By the way, the free end portion side of the lid portion is fixed to the vehicle body side, and only the fixed portion fixed to the vehicle body side on the free end portion side when the bag body is unfolded is left on the vehicle body side, and the fixed portion is excluded. In the case of a structure in which the free end side of the lid portion is flipped up, it is necessary to be able to break between the fixed portion and the flip-up portion of the lid portion by the unfolding force of the bag body. . The progress of the breaking has a considerable influence on the development of the bag.

  In particular, when the bag is folded into a rod-like long shape, the opening is also long, the free end side of the lid portion covering this opening is also long, and the portion to be broken is also long. The progress of breakage is extremely important. The progress mode of the break is, for example, where the break is started and how the break proceeds thereafter. Therefore, there is a demand for a structure that is a break-up progressing form that can satisfactorily deploy the bag.

  Therefore, the present invention provides a bag cover of an airbag device that can satisfactorily deploy a bag body.

The bag cover of the airbag apparatus according to the present invention employs the following means in order to solve the above problems.
The invention according to claim 1 covers the vehicle interior side of a folded bag body (for example, a bag body 19 in an embodiment to be described later) and the bag body from an inflator (for example, an inflator 18 in an embodiment to be described later). Of an airbag device (for example, an airbag module 9 in an embodiment to be described later) in which an opening (for example, an opening 40 in an embodiment to be described later) for deployment of the bag body is formed when deployed by introducing the gas pressure of A cover cover (e.g., a bag cover 21 in an embodiment described later), and a cover outer (e.g., in an embodiment described later) that forms an outer shape of a side door (e.g., a front side door 1 in an embodiment described later) on the vehicle interior side. A cover outer 35) and a cover inner (for example, in an embodiment described later) fixed to the inner surface of the cover outer. Cover and inner 36), wherein the the Kabaauta and the cover inner lid portion for closing the opening in the accommodated state of the bag (e.g., lid region 42 in the embodiment described later, the lid wall 48), The support part (for example, the side walls 38 and 46 in the example described later) coupled to the retainer (for example, the retainer 20 in the example described later) fixed to the vehicle body side, and the lid part and the support part are connected to each other. A hinge portion (for example, a bending base line portion 44 and a strip-like piece 53 in an embodiment to be described later) serving as a rotation fulcrum when the lid portion is rotated is provided, and the cover inner includes the hinge portion of the lid portion. the free end away from in front deployment of the bag is coupled to the vehicle body side, breakable portion breakable by the deployment force during deployment of the bag For example, breakable wall 60) is provided in the examples described later, the Kabaauta is the free end away from the hinge of the lid portion, the door glass (for example, by bending in an L-shape, A weather strip (for example, a weather strip in an embodiment described later) attached to a door body (for example, a door body 3 in an embodiment described later) while facing a vehicle interior side surface of a door glass 4) in the embodiment described later with a gap. 16) is provided with a bent wall (for example, a bent wall 39 in the embodiment described later), and the breakable portion is provided with a break that promotes breakage along substantially the same direction as the hinge portion extends. A bag cover for an airbag apparatus, characterized in that a promotion portion (for example, a breakage promotion portion 61 in an embodiment described later) is provided. It is.
By comprising in this way, the fracture | rupture direction of the breakable part at the time of expansion | deployment of a bag body can be pinpointed in the substantially same direction as the direction where a hinge part is extended.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, the breakage accelerating portion promotes breakage along a direction from the approximate center in the longitudinal direction toward the outside.
By comprising in this way, a fracture | rupture can be started from the center vicinity of the longitudinal direction of the fracture | rupture promotion part in a fracture | ruptureable part, and a fracture | rupture can be advanced toward the outer side of a longitudinal direction from there.

  According to the first aspect of the present invention, since the breaking direction of the breakable portion at the time of deployment of the bag body can be specified substantially in the same direction as the extending direction of the hinge portion, the opening configuration of the lid portion is stabilized. Can do.

  According to the invention according to claim 2, since the break can be started from the vicinity of the center in the longitudinal direction of the breakage promoting portion in the breakable portion, and the breakage can proceed from the longitudinal direction to the outside in the longitudinal direction, The lid portion can be opened from the substantially central portion in the longitudinal direction, and the opening timing can be stabilized.

It is the front view which looked at the vehicle door carrying the airbag apparatus provided with the bag cover which concerns on this invention from the vehicle interior side. It is the front view seen from the vehicle interior side of the vehicle door which shows the attachment state of the said airbag apparatus. It is sectional drawing corresponding to the AA cross section of FIG. It is a disassembled perspective view of the said airbag apparatus. It is a rear view of the airbag apparatus. It is a perspective view of the bag cover of the airbag apparatus.

  Hereinafter, an embodiment of a bag cover of an airbag device according to the present invention will be described with reference to the drawings of FIGS. In the drawings, the upper side and the front side of the vehicle are indicated by arrows UP and FR, respectively.

FIG. 1 is a view of the front side door 1 on the right side in the traveling direction of the vehicle as viewed from the vehicle interior side, and FIG. 2 is a view in which some members such as the door lining 2 are removed from the front side door 1 of FIG. FIG. 3 is a cross-sectional view corresponding to the AA cross section of FIG.
The front side door 1 is a so-called sashless type door that does not have a window frame, and a door glass 4 is held on the door body 3 so as to be movable up and down. The door main body 3 includes a door skeleton 5 and a door skin 6 (see FIG. 3) attached to the outside of the door skeleton 5.

  As shown in FIG. 2, a mirror base 8 for attaching a door mirror (not shown) is integrally provided on the front upper end side of the door body 3, and modularized at the upper edge of the door body 3 on the vehicle interior side. A mounting bracket 10 for mounting the airbag device 9 (hereinafter referred to as “airbag module 9”) is provided.

  As shown in FIG. 2, the mounting bracket 10 includes a flat plate-like base plate portion 11 that extends in the longitudinal direction of the vehicle body along the upper end portion of the door body 3, and an airbag is provided at the upper edge portion of the base plate portion 11. The fastening piece 12A and three airbag locking claws 13A, 13B, 13C are extended upward. The airbag fastening pieces 12A are disposed at positions closer to the front of the vehicle body of the base plate portion 11, and the airbag latching claws 13A, 13B, 13C are disposed at substantially equal intervals in the vehicle body central region of the base plate portion 11. Air bag fastening pieces 12B and 12C extend from the lower edge portion of the base plate portion 11 near the front of the vehicle body.

  As shown in FIG. 3, the mounting bracket 10 is fixed to the door body 3 in contact with the upper portion of the door skeleton 5, and the airbag latching claws 13A, 13B, 13C It protrudes upward away from the skeleton 5. Further, a weather strip 16 on the inside of the vehicle that is slidably in close contact with the inner surface of the door glass 4 is attached to the flange portion 15 a formed on the upper edge of the door frame portion 5. In addition, 17 in FIG. 3 is a weather strip outside the vehicle that is attached to the upper end portion of the door skin 6 and is slidably in close contact with the vehicle outer surface of the door glass 4.

FIG. 4 is a perspective view showing a state where the airbag module 9 is disassembled, and FIG. 5 is a rear view of the airbag module 9.
As shown in these figures, the airbag module 9 is deployed by receiving a cylindrical inflator 18 that generates high-pressure gas when an impact is detected by a sensor (not shown), and gas pressure generated by the inflator 18. The folded bag body 19 (see FIGS. 2 and 3), the inflator 18 and a metal retainer 20 that holds the bag body 19, and the outer side of the folded bag body 19 on the vehicle interior side are covered to form a bag body. A bag cover 21 that allows the bag body 19 to be unfolded by opening a portion when the 19 is unfolded.

  The inflator 18 is connected in series with a diffuser pipe 22 (see FIG. 3) having a plurality of gas outlets (not shown) on the outer peripheral surface, and a bag body 19 is connected to the diffuser pipe 22. The bag body 19 is folded up and down with the front and rear edges folded back, and is arranged in a long shape along the longitudinal direction of the diffuser pipe 22.

  The retainer 20 is integrally coupled to the vehicle interior side of the base plate 23 that is substantially flat in the longitudinal direction of the vehicle body, and holds the diffuser pipe 22 and the side and bottom side of the bag body 19 on the vehicle interior side. And a holding plate 24 having a substantially L-shaped cross section. The inflator 18 and the diffuser pipe 22 are coupled to the inner surface of the base plate 23, and the holding plate 24 is integrally coupled to the inner side of the bag cover 21 before coupling to the base plate 23, as shown in FIG. The base plate 23 and the holding plate 24 are bolts when the bag cover 21 is finally assembled to an assembly in which the inflator 18 and the bag body 19 are coupled to the base plate 23 (hereinafter referred to as “base plate side unit 23U”). They are connected to each other by bonding or riveting.

  The inflator 18 is coupled to the front end side of the base plate 23. Specifically, a bracket 30 that holds the outer peripheral surface of the inflator 18 is attached to the inflator 18, and a lower arm 31 extending from the bracket 30 is bolted to the base plate 23. The bracket 30 is provided with an upper arm 32 extending upward, and the upper arm 32 is bolted to the airbag fastening piece 12 </ b> A of the mounting bracket 10. In the figure, 33a is a bolt hole for bolting the upper arm 32 to the airbag fastening piece 12A, and 33b and 33c are the front side lower edge of the base plate 23 and the airbag fastening piece 12B of the mounting bracket 10. , 12C are bolt holes for fastening the bolts. The rear end portion of the base plate 23 is bolted to the mounting bracket 10 through a bolt hole 33d.

  Further, an end wall 25 (see FIG. 4) is extended at each end in the longitudinal direction (vehicle body longitudinal direction) of the holding plate 24 so as to close the inner region of the substantially L-shaped basic cross section. The joining flange 25a connected to the end wall 25 is finally fixed to the base plate 23 by rivets. The retainer 20 formed by connecting the holding plate 24 to the base plate 23 opens in a substantially rectangular shape above the housing portion of the bag body 19, and the surface except for the upper side substantially surrounds the peripheral area of the bag body 19. .

  A corrugated plate member 26 is fixed at a plurality of locations on the upper edge portion of the base plate 23 on the door body 3 side, and sheath-shaped claw receiving portions 27A, 27B, and 27C are formed between the fixed portions of the plate member 26. ing. The claw receiving portions 27A, 27B, and 27C are opened to the lower side so that the airbag module 9 can be fitted to the corresponding airbag locking claws 13A, 13B, and 13C by covering the mounting bracket 10 from above. It has become.

FIG. 6 is a view showing a state in which the bag cover 21 is viewed obliquely from below the vehicle exterior.
As shown also in the figure, the bag cover 21 is welded and fixed to a cover outer 35 that forms the exterior of the front side door 1 together with the door lining 2 (see FIG. 1), and an inner side surface of the cover outer 35, and is attached to the bag cover. 21 and a cover inner 36 that performs a rigidity adjustment of each part on 21 and a connecting function with other parts.

  As shown in FIG. 3, the cover outer 35 has a two-layer structure in which a skin material 35B made of a soft resin is integrally joined to the outside of a base material 35A made of a relatively hard resin material. In the cover outer 35, a side wall 38 that covers the vehicle interior side of the retainer 20 is smoothly and continuously formed on an upper wall 37 that covers an upper side of an opening (bag housing portion) of the retainer 20. As shown in FIGS. 1 and 2, the side wall 38 is formed to have a substantially pentagonal shape whose upper side is substantially horizontal when viewed from the side. When the bag cover 21 is finally attached to the base plate side unit 23U, the inflator 18 and the front end portion of the base plate 23 protrude forward of the cover outer 35 (see FIG. 2). Also, a bent wall 39 that is bent downward in a substantially L shape is provided at the end of the upper wall 37 on the door body 3 side. When the airbag module 9 is attached to the door body 3, the bent wall 39 extends to the vicinity of the weather strip 16 on the vehicle interior side as shown in FIG. The lip 16a is in close contact.

  As shown in FIGS. 4 to 6, the upper wall 37 and the bent wall 39 of the cover outer 35 are provided with breakage guide portions 41 for forming an opening 40 that allows the bag body 19 to be deployed. The breakage guide part 41 is configured by forming a V-shaped groove on the back surface of the base material 35A of the cover outer 35, for example. Further, the breakage guide portion 41 is provided corresponding to the front and rear positions of the folded bag body 19, and when the bag body 19 is unfolded, the region surrounded by the breakage guide portion 41 on the cover outer 35 is pressed against the bag body 19. It is designed to jump up like a lid. The substantially rectangular area on the cover outer 35 that jumps up like a lid when the bag body 19 is deployed will be referred to as a lid area 42 below. The side of the base side of the lid region 42 is a bent base line portion 44 (hinge portion) in which the central region excluding the front and rear edges thereof serves as the rotation starting point of the lid region 42. In the case of this embodiment, the breakage guide portions 41 before and after the lid region 42 are provided so as to wrap around in a substantially L shape up to a part of the base side of the lid region 42.

  The cover inner 36 is made of a relatively hard resin material, and includes an upper wall 45 and a side wall 46 that are welded and fixed to the upper wall 37 and the side wall 38 of the cover outer 35, respectively, as shown in FIGS. The upper wall 45 is provided with a dotted cutout portion 47 (see FIG. 6) that is substantially U-shaped and elongated in the longitudinal direction of the vehicle body, and in the cutout portion 47, a substantial portion corresponding to the lid region 42 of the cover outer 35. A rectangular lid wall 48 is arranged. The lid wall 48 is integrally welded and fixed to the back surface of the lid region 42 of the cover outer 35. In addition, a plurality of raised portions 49 are provided at the lower edge of the side wall 46, and a locking hole 50 is provided in each raised portion 49. As shown in FIG. 3, a locking hook 51 extending on the holding plate 24 of the retainer 20 is inserted into and engaged with each locking hole 50. Therefore, the side wall 46 of the cover inner 36 is locked to the retainer 20, and serves as a support portion that is supported on the door body 3 side via the retainer 20. 3 and 6, a resin fastening block 52 is welded and fixed separately from the cover inner 36 to the back surface of the side wall 38 of the cover outer 35, and the holding plate 24 is fixed to the fastening block 52. It is fixed with screws.

  The lid wall 48 is integrally connected to the upper portion of the side wall 46 via a plurality of strips 53 formed in the discontinuous portion of the notch portion 47. Each belt-like piece 53 is curved in an arc shape so as to bulge downward, and is separated from the cover outer 35 without being welded. These band-like pieces 53... Function as hinge portions when the lid wall 48 is flipped up and rotated.

  Here, in the bag cover 21 of this embodiment, when the cover outer 35 and the cover inner 36 are integrally welded, the lid region 42 on the cover outer 35 side and the lid wall 48 on the cover inner 36 side are when the bag body 19 is deployed. A lid portion that opens the opening 40 is configured, and a bent base line portion 44 on the cover outer 35 side and a strip-like piece 53 on the cover inner 36 side constitute a hinge portion that serves as a pivotal fulcrum of the lid portion.

  As shown in FIG. 6, flange walls 54, 54 straddling the upper wall 45 and the side wall 46 are provided at the outer positions in the front-rear direction of the notch 47 of the cover inner 36, respectively. 54 is connected to the end walls 25, 25 of the holding plate 24 of the retainer 20 by bolts 55 (see FIG. 4).

In addition, a breakable wall (breakable portion) 60 is extended downward on the lower surface of the lid wall 48 of the cover inner 36 on the free end side that is separated from the strips 53. At the base of the breakable wall 60, a breakage promoting portion 61 is formed along substantially the same direction as the direction in which the strips 53 are arranged (that is, the longitudinal direction of the vehicle body). A plurality (five in this embodiment) of connecting pieces 57 are provided at a predetermined interval. The breakage promoting portion 61 is formed to be thin, and a plurality of long holes 62... Are arranged in a line along the longitudinal direction of the breakage promoting portion 61. In this embodiment, one long hole 62 is provided in each of the parts adjacent to each connecting piece 57 and the part located between these parts. A substantially V-shaped notch 63a whose opening width gradually decreases toward the front is formed at the end of the long hole 62A disposed adjacent to the central connecting piece 57 on the front side of the vehicle body. In the end of the long hole 62A on the vehicle body rear side, a substantially V-shaped notch 63b whose opening width gradually decreases toward the rear is formed. Further, in the long holes 62B... Arranged on the vehicle body front side with respect to the central long hole 62A, the opening width gradually decreases toward the front only at the end of the long hole 62B on the vehicle body front side. A notch 63a that is pointed in a letter shape is formed, and in the long hole 62C that is disposed on the rear side of the vehicle body with respect to the central long hole 62A, only the end of the long hole 62C on the rear side of the vehicle body is rearward. A substantially V-shaped notch 63b whose opening width gradually narrows toward is formed.
Each connecting piece 57 is rivet fixed to the base plate 23 of the retainer 20. The rivet fixing of the connecting piece 57 may be fixed to the base plate 23 together with the corrugated plate member 26 when the bag cover 21 is finally assembled to the base plate side unit 23U, for example.

When the airbag module 9 configured as described above is attached to the door body 3, the mounting bracket 10 is previously attached to the upper portion of the door body 3, and the airbag locking claws 13A of the mounting bracket 10 in that state are attached. By fitting the claw receiving portions 27A, 27B, and 27C of the airbag module 9 into the airbag 13 from above, the airbag module 9 is temporarily fixed to the door body 3.
Thereafter, the airbag module 9 is accurately positioned with respect to the door body 3, and the retainer 20 (base plate 23) of the airbag module 9 is bolted to the mounting bracket 10. Therefore, the breakable wall 60 in the cover inner 36 of the bag cover 21 is coupled to the vehicle body side before the bag body 19 is deployed.
Then, the door lining 2 is attached to the vehicle interior side of the door body 3 so as to be associated with the bag cover 21 of the airbag module 9 thereafter.

When the airbag module 9 is attached to the door body 3 as described above, the inflator 18 and the bag body 19 are fixed to the door body 3 via the retainer 20, and the upper side of the bag body 19 is the lid portion of the bag cover 21 ( The lid area 42 and the lid wall 48) will be covered.
Further, at this time, the bent wall 39 of the bag cover 21 faces the side surface of the door glass 4 with a minute gap, and the outer lip 16a of the weather strip 16 on the door body 3 side is formed on the outer surface of the bent wall 39. Closely. Accordingly, the upper end portion of the bag cover 21 is opposed to the upper portion of the door body 3 with a sufficient width in the height direction at the bent wall 39 portion, and the weather strip 16 is in close contact with the bent wall 39 so that a gap therebetween is formed. Is buried. In the bag cover 21, a substantially L-shaped bent wall 39 is connected to the end of the upper wall 37 on the door body 3 side, so that the rigidity of the end of the upper wall 37 is maintained sufficiently high. ing. Therefore, by adopting this bag cover 21, merchantability including appearance quality can be enhanced.

  When a large impact is input to the vehicle and the airbag module 9 is activated, the bag body 19 starts to be deployed by introducing gas pressure from the inflator 18 to the bag body 19, and the bag body 19 is moved upward from the retainer 20. Try to jump out. At this time, when the bag body 19 presses the lid portion (the lid wall 48 and the lid region 42) of the bag cover 21 from the back surface side, the breakage promoting portion 61 of the cover inner 36 is cleaved along the longitudinal direction and the breakable wall is formed. 60 is left on the vehicle body side, and the cover outer 35 is broken at the break guide 41, so that the lid wall 48 of the cover inner 36 and the lid region 42 of the cover outer 35 are integrally pushed to the inside of the vehicle. Thereby, the opening 40 is formed in the upper wall 37 of the bag cover 21, and the bag body 19 is developed from the opening 40 to the upper side of the vehicle interior.

  By the way, in the case of this airbag module 9, since the bag body 19 is elongate along the front-back direction of the door main body 3, the lid part of the bag cover 21 becomes long in the front-back direction. In this case, in order to unfold the bag body 19 that is long in the front-rear direction in this manner, the lid portion (the lid wall 48 and the lid region 42) of the bag cover 21 rises from the center portion in the front-rear direction, It is preferable that the opening 40 is formed by being pushed open. For this purpose, the breaking of the breakage promoting portion 61 in the cover inner 36 of the bag cover 21 proceeds from the center in the longitudinal direction to the front and rear directions. Is preferred.

In the case of the airbag module 9 of this embodiment, as described above, a notch 63a that is pointed toward the front is formed at the front end of the oblong body 62A in the longitudinal center of the breakage promoting portion 61. Further, in the long holes 62B... Disposed on the front side of the vehicle body with respect to the central long hole 62A, the same notch 63a is formed only at the end portion on the front side of the vehicle body. From the long hole 62B to the adjacent long hole 62B, the cleavage proceeds sequentially from the long hole 62B to the adjacent long hole 62B.
That is, by providing the notches 63a in the long holes 62A, 62B,..., The tearing direction of the breakage accelerating portion 61 (in other words, the breaking direction of the breakable wall) is changed to the strip-like piece 53 that is a hinge portion. Can be specified substantially in the same direction as the direction in which the rupture is extended, and the rupture can be started from the center in the longitudinal direction of the rupture promoting portion 61 and progressed forward.

Similarly, a notch 63b that is pointed rearward is formed at the end of the longitudinal hole 62A at the center in the longitudinal direction of the breakage promoting portion 61 at the rear side of the vehicle body, and further on the vehicle body rear side than the central long hole 62A. In the arranged long holes 62C..., The same notch 63b is formed only at the rear end of the vehicle body, so that the cleavage starts from the central long hole 62A toward the adjacent long hole 62C. Cleavage proceeds sequentially from the long hole 62C to the adjacent long hole 62C.
That is, by providing the notches 63b in the long holes 62A, 62C,..., The tearing direction of the breakage accelerating portion 61 (in other words, the breaking direction of the breakable wall) is changed to the strip-like piece 53 that is a hinge portion. Can be specified in substantially the same direction as the direction in which the rupture extends, and the rupture can be started from the center in the longitudinal direction of the rupture accelerating portion 61, and the rupture can be advanced backward.

Therefore, in the airbag module 9 of this embodiment, the breakage accelerating portion 61 is cleaved almost simultaneously from the central long hole 62A toward the vehicle body front side and the vehicle body rear side. Thereby, it becomes possible to push open the lid part (the lid wall 48 and the lid area | region 42) of the bag cover 21 from a center part, and the opening | release form of a lid part and an opening timing can be stabilized. As a result, the bag body 19 can be developed into an appropriate shape.
In the above-described embodiment, the breakage promoting portion 61 is configured so that the cleavage progresses sequentially from the center in the front-rear direction. However, it can be configured so that the cleavage progresses in the front-rear direction from a plurality of starting points. .

9 Airbag module (airbag device)
18 Inflator 19 Bag 20 Retainer 21 Bag cover 38 Side wall (support)
40 opening 42 lid region (lid portion)
44 Bending baseline (hinge)
46 Side wall (support)
48 Lid wall (lid part)
53 Strip (hinge)
60 Breakable wall (breakable part)
61 Breaking promotion part 62, 62A, 62B, 62C Long hole 63a, 63b Notch

Claims (2)

A bag cover for an airbag device that covers a vehicle interior side of a folded bag body and that has an opening for deployment of the bag body when the bag body is deployed by introducing gas pressure from an inflator. ,
A cover outer that forms an outer shape of the side door in the vehicle interior; and a cover inner fixed to the inner surface of the cover outer;
In the cover outer and the cover inner,
A lid portion that closes the opening in the storage state of the bag body, a support portion that is coupled to a retainer that is fixed to the vehicle body side, and that connects the lid portion and the support portion and rotates when the lid portion rotates. A hinge part serving as a fulcrum, respectively,
In the cover inner,
The free end away from the hinge of the lid portion, before deployment of the bag is coupled to the vehicle body side, breakable portion breakable is provided by the expansion force during deployment of the bag,
In the cover outer,
The lid portion is bent in an L shape on the side of the free end portion away from the hinge portion so as to face the side surface of the door glass with a gap and closely contact the weather strip attached to the door body. Bend walls,
The bag cover of an airbag apparatus, wherein the breakable portion is provided with a breakage promoting portion that promotes breakage along substantially the same direction as the extending direction of the hinge portion.   The bag cover of an airbag device according to claim 1, wherein the breakage promoting portion promotes breakage along a direction from a substantially center in a longitudinal direction toward an outside.

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