JP2005008057A - Opening structure of air bag door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening structure of an air bag door capable of preventing foaming chips from separating from a foaming body and sputtering when the air bag door is opened. <P>SOLUTION: The opening structure of the air bag door is configured so that a skin protruding edge part 46 is provided protrusively in an adjoining region 44 extending along a skin cleavage designed part 26 formed at the skin 16 and the forefront surface 48 of the skin protruding edge part 46 will be put in contact with the door outer surface 50 located alongside a door rupture designed part 24 of the air bag door 20. Thereby the skin protruding edge part 46 will be extended along the outer contour line of the air bag door 20, and the foaming body 14 is enclosed in the inside. Accordingly when the air bag door 20 is opened, the foaming body 14 is not exposed at the door end face, so that the foaming chips are prevented from separating from the foaming body 14 and sputtering. The skin 16 is a urethane molding formed on the basis of the reaction injection molding technique. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an opening structure of an airbag door, and more specifically, is provided at a required position of a base material constituting a vehicle interior member, and a foam having a required thickness and a skin covering the foam are covered on an outer surface thereof. It is composed of a worn airbag door, a door break planned portion extending along the outer contour line of the airbag door, and a skin tear planned portion extending to the skin along the door break planned portion, The present invention relates to an opening structure that allows the opening of the airbag door to be allowed to proceed by the breakage of the planned door breaking portion and the opening of the skin opening scheduled portion by the pressing force of the airbag applied to the airbag door.
[0002]
[Prior art]
In most automobiles produced in recent years, in order to protect an occupant from an impact caused by a collision accident or the like, an air bag device for a driver occupant and an air bag device for a passenger occupant are equipped as standard. Of these, the airbag device for the passenger on the passenger seat is mounted in a state of being stored inside the instrument panel 10 assembled in front of the passenger compartment as a vehicle interior member, as illustrated in FIG. 10, for example. For this reason, the base material 12 constituting the instrument panel 10 is provided with an airbag door 20 at a site corresponding to the airbag device 30.
[0003]
Since the base material 12 is a member molded based on an injection molding technique from a synthetic resin material in which a reinforcing agent is added to polypropylene or the like, particularly when subjected to an instantaneous pressing force of the airbag 34 at a low temperature, There is a risk of damage due to the strong impact. Therefore, as in the instrument panel 10 illustrated in FIG. 10, the base material 12 and the airbag door 20 are used as separate members, for example, from a resin material rich in flexibility such as an olefin-based thermoplastic elastomer (TPO). In many cases, the airbag door 20 is formed on a cylindrical door molded body 22 to be formed, and the door molded body 22 is assembled to the opening installation portion 18 opened in the base material 12. The door molded body 22 illustrated in FIG. 10 is formed as a double opening type having two airbag doors 20, 20 and is connected to the case body 32 of the airbag device 30. Yes.
[0004]
The instrument panel 10 has a single-layer structure partially, but basically, the base 12 made of synthetic resin that is injection-molded into a required shape, and the outer surface of the base 12 It has a three-layer structure composed of a foam 14 formed and deposited in a required region and a skin 16 that is deposited on the outer surface of the foam 14 and covers the foam 14. Therefore, the airbag door 20 provided in the portion having the three-layer structure has a structure in which the foam 14 having a required thickness and the skin 16 covering the foam 14 are attached to the outer surface thereof. (FIG. 11). For this reason, the door molded body 22 constituting a part of the base material 12 is provided with a door break planned portion 24 extending along the outer contour line of each airbag door 20, 20, and the skin. 16, an epidermis rupture scheduled portion 26 is extended along the scheduled door rupture portion 24. Due to the pressing force of the airbag 34 applied to the airbag doors 20, 20, The opening of the airbag door 20 is allowed as the opening of the planned skin opening 26 progresses. In addition, the technique relevant to this is disclosed by patent document 1, for example.
[0005]
[Patent Document 1]
JP-A-11-198751 [0006]
[Problems to be solved by the invention]
By the way, in the conventional opening structure which concerns on the airbag door 20 provided in the instrument panel 10 which exhibits a three-layer structure, when opening the said airbag door 20, as illustrated in FIG. Simultaneously with the rupture and rupture of the planned skin rupture portion 26, the foam 14 facing the door rupture planned portion 24 and the rupture skin planned portion 26 also breaks. However, if the foam 14 is not formed with a planned breakage that causes the foam 14 to break, the foam 14 is forced to tear and is torn. Moreover, since the cracked cross section of the foam 14 is exposed at the door end face of the airbag door 20, if a large number of foam fragments are generated at the time of tearing, the foam 14 is blown off by the inflating airbag 34 and scattered. There was a risk that the foam fragments collided with the face of the occupant. In addition, when the inflating airbag 34 comes into contact with the foam 14 exposed at the door end surface of the airbag door 20, it is also concerned that more foam fragments are generated.
[0007]
OBJECT OF THE INVENTION
The present invention has been proposed to suitably solve the above-described problems. By providing a door end wall along the outer contour line of the airbag door, the foam is foamed from the foam when the airbag door is opened. It is an object of the present invention to provide an opening structure for an air bag door that suitably prevents body fragments from separating and scattering.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems and achieve the intended object, the present invention is provided with a required thickness of a base material constituting a vehicle interior member, and a foam having a required thickness and a skin covering the foam are provided on the outer surface thereof. It consists of an attached airbag door, a door break planned portion extending along the outer contour line of the airbag door, and a skin tear planned portion extending to the skin along the door break planned portion. In the opening structure that allows the opening of the airbag door to be allowed to proceed by the breakage of the door breaking planned portion and the skin opening scheduled cutting portion due to the pressing force of the airbag applied to the airbag door,
The thickness of the adjacent region extending along the planned skin tearing portion (26) of the skin is sufficient to contact the portion along the planned door breaking portion of the airbag door and enclose the foam inside. Set to
The foam body is configured not to be exposed to the door end face when the airbag door is opened.
[0009]
Similarly, in order to solve the above-mentioned problems and achieve the intended object, another invention is provided at a required position of a base material constituting a vehicle interior member, and covers a foam having a required thickness and the foam on its outer surface. An airbag door to which the skin is applied, a door break planned portion extending along the outer contour line of the airbag door, and a skin tear planned portion extending to the skin along the door fracture planned portion; In the opening structure in which the opening of the airbag door is allowed to proceed by the breakage of the door breaking planned portion and the skin opening scheduled cutting portion by the pressing force of the airbag applied to the airbag door,
The thickness of the adjacent region extending along the planned door breakage portion of the airbag door is set to a size sufficient to contact the portion along the planned skin tearing portion of the skin and enclose the foam inside. ,
The foam body is configured not to be exposed to the door end face when the airbag door is opened.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment of the airbag door opening structure according to the present invention will be described below with reference to the accompanying drawings.
[0011]
An opening structure of an air bag door according to the present invention includes a base material formed in a required shape, a foam attached to the outside of the base material, and a skin attached to the outside of the foam. This is applied to a vehicle interior member having a three-layer structure. Therefore, in each embodiment described later, as the vehicle interior member, the instrument panel 10 illustrated in FIG. 10 quoted in the description of the prior art will be exemplified, and accordingly, the same member / part as the above-described member / part is referred to. Are given the same reference numerals.
[0012]
[First embodiment]
FIG. 1 is a side sectional view of an instrument panel adopting an airbag door opening structure according to the first embodiment, and FIG. 2 is an enlarged sectional view of a main part of FIG. The instrument panel 10 adopting the opening structure of the first embodiment is basically the same as the base 12 and the airbag door 20 as compared with the conventional instrument panel 10 illustrated in FIG. The form of the skin 16 is changed.
[0013]
The base material 12 is a large-sized synthetic material formed by using, for example, an injection molding technique using an injection molding die (not shown) made of an olefin resin material in which a reinforcing agent is appropriately added to polyethylene (PE), polypropylene (PP), or the like. It is a resin molded member. And the area | region from the upper surface in the outer surface of the base material 12 to the front surface is made into the adherence part 40 with which the said foam 14 and the skin 16 are adhere | attached, and is about 1/2 of the whole outer surface. These foam 14 and skin 16 are arranged in the region. Accordingly, the rear surface of the upper surface of the base material 12 facing the lower side of the windshield and the lower surface of the front surface of the base material 12 facing the foot of the passenger seat are exposed to the outside so that the design surface of the instrument panel 10 is exposed. Come to compose. Moreover, the opening installation part 18 for assembling | attaching the said airbag door 20 is opened in the site | part corresponding to the case body 32 of the said airbag apparatus 30, for example in substantially rectangular shape.
[0014]
The airbag doors 20, 20 are formed inside the opening of a rectangular cylindrical door molded body 22 that can be aligned with the opening installation portion 18 established in the base material 12, and are located on the passenger seat side. The airbag door 20 opens to the passenger seat side, and the airbag door 20 located on the windshield side opens to the windshield side. For this reason, the door molded body 22 is provided with a plane H-shaped door break planned portion 24 extending along the outer contour line of each airbag door 20, 20, and an end of the door break planned portion 24. Hinge portions 42 are extended between the portions. The door break scheduled portion 24 and the hinge portion 42 are thin portions formed as a result of extending a groove along the outer contour line of the airbag doors 20 and 20.
[0015]
The foam 14 is, for example, a urethane foam formed by foaming a urethane raw material, and is foam-molded between the base material 12 and the skin 16 set in a foam-molding die as described later. These are interposed between the base material 12 and the skin 16. The foam 14 is formed to have a thickness of about 5 to 10 mm, although there are some differences in each part, and can exhibit appropriate elasticity. Accordingly, when an appropriate part of the epidermis 16 is pressed with a fingertip or the like, the pressed part is depressed and deformed in a concave manner, which contributes to improving the tactile sensation of the instrument panel 10. In the event of a collision accident, if the occupant is thrown forward and collides with the outer surface of the instrument panel 10, the impact is absorbed and the injury level is reduced.
[0016]
The skin 16 implemented in the open structure of the first embodiment is a urethane molded body formed on the basis of the “reaction injection molding technique” which is a known technique. As is well known, in this reaction injection molding technique, polyol and isocyanate are injected while stirring into a cavity of a required shape defined in a mold, and these are reacted in the cavity to have the same shape as the cavity. It is the method of shape | molding this urethane molded object. Therefore, for example, a sheet-like member having a different thickness for each part, a member having a complicated outer surface uneven shape, and the like, as long as it is a shape that can be removed from the mold, as in a general injection molding technique. It has a feature that makes it possible to form a shaped urethane molded body.
[0017]
As shown in FIGS. 1 and 2, the skin 16 of the first embodiment molded based on the reaction injection molding technique described above has an outer contour shape that matches the outer contour shape of the adherend 40, and The instrument panel 10 is formed into a curved concavo-convex shape premised on the external design shape, and the thickness of a general portion that occupies substantially the whole is about 1 mm, which is rich in flexibility. The outer surface of this general part is reproduced with a texture such as genuine leather and contributes to improving the texture of the instrument panel 10. The skin 16 is formed with an H-shaped skin tear planned portion 26 along the door break planned portion 24.
[0018]
In the open structure in the first embodiment, the thickness of the adjacent region 44 extending along the planned skin rupture portion 26 of the skin 16 is brought into contact with the portion of the airbag door 20 along the planned door rupture portion 24. Thus, the size is set to be sufficient to enclose the foam 14 inside. Specifically, a skin ridge 46 is projected from the adjacent region 44, and the front end surface 48 of the skin lip 46 contacts the door outer surface 50 along the door break scheduled portion 24 of the airbag door 20. It is set to be. In other words, the skin protrusion edge portion 46 is formed to extend in an H shape along the skin cleavage planned portion 26 extending in an H shape. In addition, the said skin | skin protrusion edge part 46 is formed in the base end side wider than the front-end | tip which contact | abuts on the door outer surface 50, and is made into the shape which cannot change easily.
[0019]
FIG. 4 is a partial perspective view showing a state in which the skin 16 is molded by the skin molding die 60 for molding the skin 16. The skin molding die 60 includes a first molding die 62 and a second molding die 64 that can be closed with each other, and concave portions 66 and 66 that match the shape of the skin projecting edge portions 46 and 46 are formed in the first molding die. A cavity 68 having the same shape as that of the skin 16 is internally defined when the mold 62 is closed. The first mold 62 is provided with an injection port 70 in which an injection nozzle 72 for injecting a raw material into the cavity 68 is aligned.
[0020]
FIG. 5 shows that the outer skin 16 provided with the outer skin protruding edge 46 and the base material 12 assembled with the door molded body 22 are set in the first molding die 82 and the second molding die 84 of the foam molding die 80. FIG. 6 is an explanatory cross-sectional view showing a state in which the foam 14 is foam-molded between the skin 16 and the base material 12 (airbag door 20). In the state in which the foaming mold 80 is closed, the front end surface 48 of the skin protrusion edge portion 46 comes into close contact with the door outer surface 50 of the airbag door 20. The planned portion 26 and the foaming space are isolated from each other. Therefore, the foam 14 that is foam-molded in the foaming space is cured without reaching the door break planned portion 24 and the skin tear planned portion 26.
[0021]
Therefore, in the instrument panel 10 adopting the airbag door opening structure according to the first embodiment, the airbag device 30 is activated and the pressing force of the airbag 34 is applied to the back surfaces of the airbag doors 20 and 20. The airbag doors 20, 20 are pushed upward and stress concentrates on the door breakage scheduled portion 24 and the skin tearing scheduled portion 26, so that the door breakage scheduled portion 24 breaks and the skin tearing scheduled portion 26. The cleavage of each is triggered. As the airbag 34 is inflated, when the breakage of the planned door breakage portion 24 and the tearing of the skin tearing portion 26 proceed, each airbag door 20 has an instrument panel with the corresponding hinge portions 42 and 42 as the center. 10 will open to the outside.
[0022]
That is, in the opening structure of the airbag door according to the first embodiment, the foam 14 is separated from the door fracture scheduled portion 24 and the skin tear scheduled portion 26 by the skin protruding edge 46 protruding from the skin 16. Therefore, the opening of each of the airbag doors 20 and 20 is allowed without the foam 14 breaking. Moreover, in each opened airbag door 20, 20, as illustrated in FIG. 3, since the skin protruding edge 46 faces the door end surface and extends along the door end surface, the opened airbag door 20, 20 The foam 14 is not exposed at the door end surfaces of the airbag doors 20 and 20. Therefore, it is possible to suitably prevent the foam debris from separating and scattering from the foam 14, so that the inconvenience that the foam debris collides with the face of the occupant does not occur. Furthermore, even if the inflating airbag 34 contacts the door end surface of the airbag door 20 to be opened, the airbag 34 only contacts the skin protrusion edge 46 and contacts the foam 14. Therefore, it is possible to suitably prevent the foam fragments from being scattered.
[0023]
6 and 7 are enlarged cross-sectional views of a main part of an instrument panel that employs an airbag door opening structure according to a modification of the first embodiment. In the open structure according to this modified example, the width of the skin protrusion edge portions 46, 46 formed on the skin 16 is increased, and each skin protrusion edge portion 46, 46 is the outer surface of the corresponding airbag door 20, 20. It is intended to contact the whole. Also in the opening structure of the airbag door according to this modified example, the foam 14 is separated from the door break planned portion 24 and the skin tear planned portion 26 by the skin projecting edge portion 46, and therefore the first embodiment. The same effect can be obtained.
[0024]
[Second embodiment]
FIG. 8 is an enlarged cross-sectional view of a main part of an instrument panel that employs an airbag door opening structure according to the second embodiment. Compared with the conventional instrument panel 10 illustrated in FIG. 10, the instrument panel 10 adopting the open structure of the second embodiment is basically the same as the base 12 and the skin 16, and the air The shape of the bag door 20 is changed. That is, the base material 12 is the same as that of the first embodiment, and is for assembling the door molded body 22 in which the airbag doors 20 and 20 are formed in a portion corresponding to the case body 32 of the airbag device 30. The opening installation portion 18 is formed in a substantially rectangular shape, for example. The skin 16 is formed from a resin sheet material based on vacuum molding technology, molded from resin powder based on powder slush molding technology, molded from urethane based on spray molding technology, and reaction injection from urethane. What was shape | molded based on the shaping | molding technique etc. can be implemented suitably, and the H-shaped skin-splitting planned part 26 along the said door fracture | rupture planned part 24 is formed.
[0025]
The airbag doors 20, 20 are formed inside the opening of a rectangular cylindrical door molded body 22 that can be aligned with the opening installation portion 18 established in the base material 12, and the plane H-shaped door breaks. By extending the planned portion 24 and the hinge portions 42, 42, a double-open type is formed. Then, when assembled to the opening installation portion 18, it is connected to the case body 32 of the airbag device 30.
[0026]
And in the open structure in 2nd Example, the thickness of the adjacent area | region 54 extended along the door fracture plan part 24 of the said airbag door 20 is contacted with the site | part along the plan skin cleavage part 26 of the said skin 16. Thus, the size is set to be sufficient to enclose the foam 14 inside. Specifically, a door protrusion 56 is provided in the adjacent region 54 so that the front end surface 58 of the door protrusion 56 contacts the skin back surface 52 along the planned skin cleavage portion 26 of the skin 16. Is set to That is, the door projecting edge portion 56 is formed to extend in an H shape along the door break planned portion 24 extending in an H shape.
[0027]
Accordingly, in the instrument panel 10 adopting the airbag door opening structure according to the second embodiment, the airbag device 30 is activated and the pressing force of the airbag 34 is applied to the back surfaces of the airbag doors 20 and 20. The airbag doors 20, 20 are pushed upward and stress concentrates on the door breakage scheduled portion 24 and the skin tearing scheduled portion 26, so that the door breakage scheduled portion 24 breaks and the skin tearing scheduled portion 26. The cleavage of each is triggered. As the airbag 34 is inflated, when the breakage of the planned door breakage portion 24 and the tearing of the skin tearing portion 26 proceed, each airbag door 20 has an instrument panel with the corresponding hinge portions 42 and 42 as the center. 10 will open to the outside.
[0028]
That is, in the opening structure of the airbag door according to the second embodiment, the foam 14 is separated from the planned door breakage portion 24 and the planned skin tearing portion 26 by the door protrusion 56 projecting from the airbag door 20. Therefore, the opening of each of the airbag doors 20 and 20 is allowed without the foam 14 breaking. In addition, in each opened airbag door 20, as shown in FIG. 9, the door protruding edge 56 faces the door end surface and extends along the door end surface. The foam 14 is not exposed on the door end surfaces of the doors 20 and 20. Therefore, it is possible to suitably prevent the foam fragments from separating and scattering from the foam 14, so that the same effect as in the first embodiment can be obtained.
[0029]
In addition, in each said Example, although the instrument panel 10 was illustrated, the vehicle interior member which can implement the opening structure of the airbag door of this application is not limited to this, A door panel, a pillar garnish, etc. besides this are also included. Be targeted.
[0030]
Moreover, in each said Example, although the double opening type comprised from the two airbag doors 20 was illustrated, the opening structure of the airbag door of this application is the mold opening type comprised from one airbag door, The present invention can also be applied to a four-way opening type composed of four airbag doors.
[0031]
【The invention's effect】
As described above, according to the opening structure of the airbag door according to the present invention, the thickness of the adjacent region that extends along the planned skin tearing portion of the skin contacts the site along the planned door breaking portion of the airbag door. By setting the dimensions sufficient to enclose the foam inside, the foam is not exposed at the door end surface of the airbag door to be opened, and it is preferable that the foam fragments are separated and scattered from the foam. There are benefits that can be prevented. Furthermore, even if the inflating airbag contacts the door end surface of the opened airbag door, the airbag does not contact the foam, so that it is possible to suitably prevent the foam debris from being scattered. There are also advantages such as.
[0032]
Further, according to the opening structure of the airbag door according to another invention, the thickness of the adjacent region extending along the scheduled door breakage portion of the airbag door is brought into contact with the site along the planned skin tearing portion of the skin. By setting the dimensions sufficient to enclose the foam inside, the foam is not exposed at the door end surface of the airbag door to be opened, and it is preferable that the foam fragments are separated and scattered from the foam. There are benefits that can be prevented. Furthermore, even if the inflating airbag contacts the door end surface of the opened airbag door, the airbag does not contact the foam, so that it is possible to suitably prevent the foam debris from being scattered. There are also advantages such as.
[Brief description of the drawings]
FIG. 1 is a side sectional view of an instrument panel employing an airbag door opening structure according to a first embodiment.
FIG. 2 is an enlarged cross-sectional view of a main part of FIG.
FIG. 3 is an explanatory cross-sectional view showing a state in which each airbag door receiving a pressing force of the airbag opens.
FIG. 4 is a partial cross-sectional view showing a state where the skin is molded by a skin molding die for molding the skin based on the reaction injection molding technique.
FIG. 5 is a cross-sectional view showing a state in which a foam is foam-molded in a foaming space defined between the base material and the skin, and foaming is foam-molded between the base material and the skin It shows that the body is isolated from the planned door rupture and the planned skin rupture by the skin edge.
FIG. 6 is an enlarged cross-sectional view of a main part of an instrument panel employing an airbag door opening structure according to a modification of the first embodiment.
7 is an explanatory cross-sectional view illustrating a state in which the airbag door illustrated in FIG. 6 is opened by receiving the pressing force of the airbag.
FIG. 8 is an enlarged cross-sectional view of a main part of an instrument panel adopting an airbag door opening structure according to a second embodiment.
FIG. 9 is an explanatory cross-sectional view showing a state in which the airbag door illustrated in FIG. 8 is opened by receiving the pressing force of the airbag.
FIG. 10 is a side sectional view of an instrument panel employing a conventional airbag door opening structure.
11 is an enlarged cross-sectional view of a main part of FIG.
12 is an explanatory cross-sectional view showing a state in which the airbag door illustrated in FIG. 11 is opened by receiving the pressing force of the airbag, and the foam is exposed on the door end surface of the opened airbag door. Is shown.
[Explanation of symbols]
10 Instrument panel (vehicle interior parts)
DESCRIPTION OF SYMBOLS 12 Base material 14 Foam 16 Skin 20 Airbag door 24 Door break planned part 26 Skin peel scheduled part 44 Adjacent area 46 Skin skin edge 48 Front end surface 50 Door outer surface 52 Skin back surface 54 Adjacent area 56 Door projection edge 58 Front end surface

Claims (5)

A foam (14) having a required thickness and a skin (16) covering the foam (14) are attached to the outer surface of the base (12) constituting the vehicle interior member (10). The airbag door (20), the door break planned portion (24) extending along the outer contour line of the airbag door (20), and the skin (16) along the door break planned portion (24) ) Extending to the skin opening scheduled portion (26), and by the pressing force of the airbag applied to the airbag door (20), the door breaking planned portion (24) is broken and the skin cleavage scheduled portion (26) In the opening structure in which the opening proceeds so that the airbag door (20) is allowed to open,
The thickness of the adjacent region (44) extending along the planned skin tearing portion (26) of the skin (16) is brought into contact with the site along the planned door breaking portion (24) of the airbag door (20). Set to a dimension sufficient to enclose the foam (14) inside;
An opening structure of an airbag door, wherein the foam (14) is not exposed to the end face of the door when the airbag door (20) is opened. An outer skin projecting edge (46) is projected from the adjacent region (44) of the outer skin (16), and a front end surface (48) of the outer skin projecting edge (46) is a door of the airbag door (20). The structure for opening an airbag door according to claim 1, wherein the structure is configured to come into contact with an outer surface (50) of the door along the planned breaking portion (24). The opening structure of the airbag door according to claim 1 or 2, wherein the skin (16) is a urethane molded body molded based on a reaction injection molding technique. A foam (14) having a required thickness and a skin (16) covering the foam (14) are attached to the outer surface of the base (12) constituting the vehicle interior member (10). The airbag door (20), the door break planned portion (24) extending along the outer contour line of the airbag door (20), and the skin (16) along the door break planned portion (24) ) Extending to the skin opening scheduled portion (26), and by the pressing force of the airbag applied to the airbag door (20), the door breaking planned portion (24) is broken and the skin cleavage scheduled portion (26) In the opening structure in which the opening proceeds so that the airbag door (20) is allowed to open,
The thickness of the adjacent region (54) extending along the door break planned portion (24) of the airbag door (20) is brought into contact with the portion of the skin (16) along the planned skin tear portion (26). Set to a dimension sufficient to enclose the foam (14) inside;
An opening structure of an airbag door, wherein the foam (14) is not exposed to the end face of the door when the airbag door (20) is opened. A door protrusion (56) is provided in the adjacent region (54) of the airbag door, and the front end surface (58) of the door protrusion (56) is a portion to be subjected to skin cleavage of the skin (16). The opening structure of the airbag door according to claim 4, wherein the structure is in contact with the skin back surface (52) along (26).

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