JP2002067858A - Airbag device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airbag lid part having excellent appearance quality by eliminating deformation of a door part caused by a press. SOLUTION: This airbag device is composed of two parts of a recessed core material 28 having one door part 14 along a lateral cleavage part 22 and a pair of arm parts 30 extending along a longitudinal cleavage part 24, and a projecting core material piece 29 having the other door part 15 along the lateral cleavage part 22, by dividing a core material 8 at the position of the end part 26 of the longitudinal cleavage part 24 along a dividing line 27. A surface outward-bending A turning to one surface side of the core material 8 is given and formed in the one door part 14, the projecting core material piece 29 is locked by abutting on the other surface side of the pair of the arm parts 30 of the recessed core material piece 28, and the one door part 14 on which the surface outward-bending A is formed is locked by the other surface side of the other door part 15 by warping it toward the other surface side of the core material 8. Thereby, the recessed core material piece 28 and the projecting core material piece 29 are mutually restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle airbag device mounted on a vehicle such as an automobile.

[0002]

2. Description of the Related Art Some vehicles such as automobiles are provided with an airbag device as an emergency safety means. The airbag device is as follows.

[0003] That is, an instrument panel 1 as shown in FIG. 6 is provided at a front portion of a cabin of a vehicle such as an automobile. The instrument panel 1 has an airbag inflating opening 2 formed therein. Then, the opening 2 for inflating the airbag with respect to the instrument panel 1 is provided.
An airbag device 5 including an airbag grid section 3 for closing the airbag module and an airbag module 4 is mounted.

The airbag module 4 has an inflator for ejecting a pressurized gas and an airbag body which is developed by the pressurized gas from the inflator, housed in a module container. The airbag module 4 has an upper portion (open end side) fixed to a bolt protruding from the core member 8 and a lower portion (opposite to the open end side) fixed to a vehicle body side member such as a steering support member. You.

[0005] The instrument panel 1 is, for example, a hard panel composed of only a core material whose surface is appropriately drawn.

The air bag grid portion 3 is a resilient portion pad separate from the instrument panel 1 and has a size to cover a substantially half area of the instrument panel 1 on the passenger seat side. As shown, skin 6
It has a three-layer structure having a (skin material), a foam layer 7 and a core material 8. In the airbag lid part 3 having the three-layer structure, the skin 6 and the core material 8 formed in advance in the shape of the airbag lid part 3 are put into a foaming mold, and a foaming agent is injected between the skin 6 and the core material 8. Formed by The core 8 is made of metal, but may be made of resin. The airbag lid portion 3 is attached to a step formed around the airbag inflating opening 2 of the instrument panel 1 so as to be substantially flush with the instrument panel 1.

As shown in FIG. 8, at the position corresponding to the air bag inflating opening 2 in the core member 8 on the back surface of the air bag grid portion 3, an opening through which the air bag body inflates is formed. The slits 12 are formed at once to define the door portions 14 and 15 for closing the doors. This slit 12
For example, when the core material 8 is made of a metal and has a substantially H-shape in a plan view, the size substantially corresponding to the airbag inflation opening 2, the core material 8 is formed by punching with a press or the like. At this time, the edge portions 13 of the slits 12 may be folded back toward the surface of the core member 8 to increase the strength of the door portions 14 and 15. A cleavage groove is formed in the foam layer 7 and the six skin layers in the slit 12 in a later step as necessary. In addition, slit 1
2 is substantially H-shaped in plan view, the door portions 14 and 1
5 will be formed in two sheets. And the door part 14,
A hinge portion 16 is formed along a connecting portion (boundary portion) between the opening 15 and the opening.

According to this configuration, when an inflator provided inside the airbag module 4 is operated by applying an impact force equal to or more than a predetermined value to the vehicle body, pressurized gas is ejected from the inflator, and the airbag module 4 enters the airbag module 4. A pressurized gas is introduced into the folded and stored airbag body.

The airbag body is inflated with the introduction of the pressurized gas, and the pressure of the inflation causes the door portions 14 and 15 of the airbag lid portion 3 to extend along the H-shaped slit 12 in a plan view. At the same time as the airbag is cleaved to form a bulging opening, the airbag body bulges obliquely rearward of the vehicle body (to the occupant side) from the bulging opening. As a result, the airbag body receives the head and the like of the occupant on the passenger seat side seated at a fixed position, and protects the head and the like from coming into contact with the instrument panel 1 and the like.

[0010]

However, in such a conventional airbag device for a vehicle, a slit 12 having a substantially H-shape in plan view is formed by punching a core material 8 made of metal or the like by pressing. Since the pressing is performed from the back side to the front side during the punching process by the press, the door portions 14 and 15 are bent upward as shown by the phantom line in FIG. 8, for example. Sometimes. In such a case, for example, when a foaming agent is injected between the skin 6 and the core material 8 in a foaming mold, the pressure of the foaming agent around the bent door portions 14 and 15 increases, so that the pressure is partially increased. Since the foamed layer 7 in a compressed state is formed, the compressed portion of the foamed layer 7 is restored after the mold is released, so that the airbag lid portion 3 has a poor appearance quality in which the portion of the skin 6 is expanded. It will be something.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an airbag apparatus for a vehicle which can solve the above-mentioned problems and can obtain an airbag grid part having a good appearance without deformation of a door part by a press. is there.

[0012]

According to a first aspect of the present invention, there is provided an airbag lid having a multi-layer structure having at least a skin material and a core material, wherein the core material is provided. An airbag device for a vehicle having a substantially H-shaped cleavage portion in a plan view comprising a single horizontally cleaved portion and two vertically cleaved portions passing through both ends of the horizontally cleaved portion. At the position of the end of the cleaved part, it is divided along a dividing line substantially parallel to the lateral cleaved part, and one of the door parts along the lateral cleaved part and both sides of the door part and along the vertical cleaved part A substantially concave core material piece having a pair of arm portions extending in
A core material piece having a substantially convex shape in plan view having the other door portion along the lateral cleavage portion, and the one door portion of the core material piece having a substantially concave shape in plan view has one surface of the core material Outward bending toward the side is formed, and the substantially convex core piece in plan view is abutted against the other surface side of the pair of arms in the core piece substantially concave in plan view. The one door portion having the out-of-plane bending formed is bent toward the other surface side of the core material and locked to the other surface side of the other door portion, so that the substantially concave core material piece in plan view and the flat surface are formed. It is characterized in that a substantially convex core material piece is mutually restrained.

According to the first aspect of the present invention, the core piece having a substantially convex shape in plan view is provided on the other surface side of the pair of arms in the core piece having a substantially concave shape in plan view. By abutting and locking, the one door portion formed with the out-of-plane bending is bent toward the other surface side of the core material and locked to the other surface side of the other door portion, thereby substantially eliminating the planar view. By mutually constraining the concave core piece and the substantially convex core piece in plan view, it is possible to absorb deformation of the door portion when the core material is processed by pressing. Therefore, it is possible to obtain an airbag lid part having good appearance quality. Further, since the open edges forming the split portion of the two door portions are overlapped, the skin material or the like of the split portion is cut straight along the open edge of the door portion, and thereby the skin material or the like is cut off. This has the effect of reducing scattering.

According to the second aspect of the present invention, the core piece having a substantially convex shape in a plan view is brought into contact with the tips of the pair of arms on the other surface side of the core material piece having a substantially concave shape in a plan view. It is characterized by being stopped.

According to the second aspect of the present invention, the core piece having a substantially convex shape in plan view is replaced with the pair of arm portions on the other surface side of the core piece having a substantially concave shape in plan view. By contacting and locking to the tip of the core member, a mutual restraining force between the core material piece having a substantially concave shape in plan view and the core material piece having a substantially convex shape in plan view can be obtained. In addition, the mutually constrained portions make it possible to ensure the sealing performance during molding.

According to the third aspect of the present invention, the core material piece having a substantially convex shape in plan view is provided on the other side of the core material piece having a substantially concave shape in plan view in the longitudinally cleaved portion of the pair of arms. It is abutted and locked on the side surface along.

According to the third aspect of the present invention, the pair of arm portions are provided on the other surface of the substantially concave core material piece in plan view. By abutting and locking the side surface along the vertical cleavage portion of the above, it is possible to obtain a mutual restraining force between the core material piece having a substantially concave shape in plan view and the core material piece having a substantially convex shape in plan view. . In addition, the mutually constrained portions make it possible to ensure the sealing performance during molding.

[0018]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show a first embodiment of the present invention. Note that the same or equivalent parts as those in the conventional example are denoted by the same reference numerals and description thereof will be omitted.

First, the structure will be described. In the first embodiment, as shown in FIG.
And two vertical cleavage portions 24 passing through both ends of the horizontal cleavage portion 22.
The core material 8 having a substantially H-shaped cleavage portion 25 in plan view is divided along a dividing line 27 substantially parallel to the horizontal cleavage portion 22 at the position of the occupant-side end 26 of the vertical cleavage portion 24. Thus, a two-part configuration of the concave core piece 28 and the convex core piece 29 is adopted. In FIG. 2, the lateral cleavage portion 22 extends in the vehicle width direction 21 and the vertical cleavage portion 24 extends in the vehicle front-rear direction 23. However, the invention is not necessarily limited to this direction.
The lateral cleavage portion 22 extends in the vehicle front-rear direction 23 and the vertical cleavage portion 24
May be extended in the vehicle width direction 21 or may be any other direction.

As shown in FIG. 3, the concave core piece 28 is provided at the divided portion (the portion along the dividing line 27) through the door portion 14 on the side opposite to the occupant and the vertically split portion 24. 14 and a pair of arm portions 30 extending along the longitudinal cleavage portion 24.

As shown in FIG. 4, the convex core piece 29 has a substantially convex shape in a plan view having a door portion 15 on the occupant side at a divided portion (a portion along the dividing line 27).

Then, a plurality of overlapping portions 31 to 36 overlapping each other are formed between the divided portion of the concave core piece 28 and the divided portion of the convex core piece 29. The overlapping portions 31 to 36 include overlapping portions 31 and 32 corresponding to the horizontal cleavage portion 22, overlapping portions 33 and 34 corresponding to the vertical cleavage portion 24, and overlapping portions 35 and 36 along the dividing line 27 other than these. There are three types.
The overlapping portions 31, 33, 35 are provided on the concave core piece 28 side, and the overlapping portions 32, 34, 36 are provided on the convex core piece 29 side. In particular, the overlapping portion 31 is provided at an edge portion of the door portion 14 corresponding to the lateral cleavage portion 22, and the overlapping portion 32 is provided at an edge portion of the door portion 15 corresponding to the lateral cleavage portion 22. Further, the overlapping portion 33 is provided on a side edge portion corresponding to substantially a half portion of the vertical cleavage portion 24 of the arm portion 30 on the convex core piece 29 side, and the overlapping portion 34 is formed of the vertical cleavage portion 24 of the door portion 15. It is provided on a side edge portion corresponding to approximately 部 part of the convex core piece 29 side. The overlapping portion 35 is provided at an edge of the arm 30, and the overlapping portion 36 is provided at a portion of the convex core piece 29 along the dividing line 27.

Further, the door portion 14 of the concave core piece 28 may be placed on the back side (front side) of the core 8 in advance. In this case, the relationship between the front and back is reversed. The required amount of bending processing is performed toward (the case described below). The out-of-plane bending A toward the back side is preferably formed simultaneously with the pressing of the concave core piece 28. The bending center of the out-of-plane bending A to the back side is the hinge portion 1 of the door portion 14.
It is good to set it to position 6. Incidentally, although it is assumed that the pressing is performed from the back side to the front side, the pressing may be performed from the front side to the back side.

A substantially convex core piece 29 in plan view is provided on the surface side of the pair of arm portions 30 in the substantially concave core piece 28 in plan view.
And the one door part 14 having the out-of-plane bending A formed thereon is bent toward the surface of the core member 8 and the other door part 15 is bent.
The core piece 28, which is substantially concave in plan view, and the core piece 29, which is substantially convex in plan view, are mutually restrained.

More specifically, the overlapping portions 34, 3 of the convex core piece 29 are provided on the surface side of the overlapping portions 33, 35 of the concave core piece 28.
6 while the door portion 14 of the concave core piece 28 is bent to the surface side against the out-of-plane bending A, and the overlapping portion 31 of the door portion 14 is formed in the convex core piece 29. Door part 1
5 is locked on the surface side of the overlapping portion 32.

Finally, the concave core piece 28 and the convex core piece 29
Are combined in a mutually constrained state, and then both are integrated by spot welding.

A seal tape 40 is attached to at least a portion of the concave core piece 28 on the side of the anti-convex core piece 29 of the longitudinally cleaved portion 24. If necessary, overlapping portions 31 and 32
, And between the overlapping portions 33 and 34 and between the overlapping portions 35 and 36, the same seal tapes 41 and 42 may be attached.
The sealing tapes 40 to 42 may be made of paper or resin such as urethane or sponge.

Next, the operation of the first embodiment will be described.

The process of operating the airbag device 5 is the same as in the case of FIGS.

In the first embodiment, the core 8 has a two-part structure including a concave core piece 28 and a convex core piece 29, and a divided portion of the concave core piece 28 along the dividing line 27. And a plurality of overlapping portions 31 to 3 between the convex core material piece 29 and the divided portion.
6 is formed, and the door portion 14 of the concave core piece 28 is formed with an out-of-plane bend A toward the back side, so that the overlapping portion 34 of the convex core piece 29,
36 is engaged with the surface of the overlapping portions 33 and 35 of the concave core piece 28, and the door portion 14 of the concave core piece 28 is bent toward the surface against the out-of-plane bending A. The overlapping portion 31 of the door portion 15 in the convex core piece 29 is replaced with the overlapping portion 31 of the portion 14.
Is locked to the surface side of the core material piece 28, and the core material piece 28 having a substantially concave shape in plan view and the core material piece 29 having a substantially convex shape in plan view are in a state of being mutually restrained.

As described above, the concave core piece 28 and the convex core piece 29 are mutually restrained and corrected to absorb the deformation of the door portions 14 and 15 when the core 8 is processed by pressing. can do. Therefore, it is possible to obtain the airbag lid part 3 having good appearance quality.

For example, in the case of the airbag lid part 3 having a three-layer structure having the skin 6, the foam layer 7, and the core material 8, the foaming agent is injected between the skin 6 and the core material 8 to form the foam layer 7. In the foam molding, the partial compression of the foam layer 7 due to the deformation of the core material 8 is prevented, and the airbag lid part 3 having good appearance quality can be obtained after the mold is released.

Since the open edges forming the split portion 25 of the two door portions 14 and 15 are overlapped (overlapping portions 31 to 34), the skin 6 and the foam layer 7 of the split portion 25 are not covered by the door portion 14. , 15 cut straight along the open edges. This also has the effect of reducing scattering of the foam layer 7.

Further, at least the sealing tape 40 is stuck to the anti-convex core material piece 29 side of the longitudinally cleaved portion 24 in the concave core material piece 28 so that the skin 6 and the core material 8 can be foamed. When the foaming agent is injected therebetween, it is possible to prevent the foaming agent from leaking from a gap formed in a half portion of the vertically split portion 24 on the anti-convex core piece 29 side.

The overlapping portion 3 corresponding to the lateral cleavage portion 22
1, 32, overlapping portions 33 and 34 corresponding to approximately 1/2 portions of the vertically split portion 24 on the convex core piece 29 side, and other overlapping portions 35 and 3
By providing 6, the gap in which the foaming agent leaks can be eliminated, and the trouble of attaching the seal tape 40 can be eliminated. In addition, the sealing tapes 41 and 42 can be attached to the overlapping portions 31 to 36, and thus, leakage of the foaming agent at the time of foam molding can be more reliably prevented.

Although the preferred embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this preferred embodiment, and the design may be changed without departing from the scope of the present invention. Included in this invention.

For example, the core material 8 may be divided into a concave core material piece and a convex core material piece at the position of the longitudinally cleaved portion 24 on the side opposite to the occupant.

The air bag grid section 3 to which the technology of this embodiment is applied is not limited to the three-layer structure having the skin 6, the foam layer 7 and the core material 8, but the skin 6 and the core The present invention is also applicable to a two-layer structure having the material 8 and a four-layer structure or more. Further, a skin material such as a multilayer laminate sheet may be used for the skin 6.
This multilayer laminate sheet is obtained by appropriately laminating a skin layer, a foam material layer, a barrier layer, and the like.

[0040]

As described above, according to the first aspect of the present invention, a substantially convex core piece in plan view is applied to the other surface side of the pair of arms in the core piece having substantially concave shape in plan view. A core material having a substantially concave shape in a plan view by being engaged and locked, and bending one door portion having the out-of-plane bending formed to the other surface side of the core material and locking it to the other surface side of the other door portion. By mutually restraining the piece and the core material piece having a substantially convex shape in plan view, it is possible to absorb deformation of the door portion when the core material is processed by pressing. for that reason,
It is possible to obtain an airbag lid part having good appearance quality. Further, since the open edges forming the split portion of the two door portions are overlapped, the skin material or the like of the split portion is cut straight along the open edge of the door portion, and thereby the skin material or the like is cut off. This has the effect of reducing scattering.

According to the second aspect of the present invention, the substantially convex core piece in plan view is brought into contact with and engaged with the tips of a pair of arms on the other surface side of the substantially concave core piece in plan view. Thus, it is possible to obtain a mutual restraining force between the core piece that is substantially concave in plan view and the core piece that is substantially convex in plan view. In addition, the mutually constrained portions make it possible to ensure the sealing performance during molding.

According to the third aspect of the present invention, the core member having a substantially convex shape in plan view is brought into contact with the side surface along the longitudinally split portion of the pair of arms on the other surface side of the core member having substantially concave shape in plan view. By engaging and stopping, it is possible to obtain a mutual restraining force between the core material piece having a substantially concave shape in plan view and the core material piece having a substantially convex shape in plan view. In addition, the mutually constrained portions can exert a practically useful effect that the sealing property during molding can be ensured.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an airbag lid portion according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a state where the core material of FIG. 1 is divided.

FIG. 3 is a plan view of an anti-occupant side core material piece of FIG. 2;

FIG. 4 is a plan view of an occupant-side core piece of FIG. 2;

FIG. 5 is a partially enlarged perspective view of the core member of FIG. 2;

FIG. 6 is an exploded perspective view of an instrument panel for explaining a conventional example.

FIG. 7 is a side sectional view of the air bag grid section of FIG. 6;

FIG. 8 is a plan view of the core member of FIG. 7; Reference Signs List 3 air bag grid part 6 skin 7 foam layer 8 core material 14 door part 15 door part 21 vehicle width direction 22 lateral cleavage part 23 vehicle front-back direction 24 vertical cleavage part 25 cleavage part 26 end part 27 parting line 28 concave side core piece 29 Convex side core piece 30 Arm part 31 Overlapping part 32 Overlapping part 33 Overlapping part 34 Overlapping part 35 Overlapping part 36 Overlapping part A Out-of-plane bending

Claims (3)

[Claims] 1. An airbag lid portion having a multilayer structure having at least a skin material and a core material, wherein the core material has one horizontal split portion and two vertical split portions passing both ends of the horizontal split portion. The airbag device for a vehicle having a substantially H-shaped cleavage portion in plan view, comprising a split portion, wherein the core is divided at a position of an end of the vertical cleavage portion along a dividing line substantially parallel to the horizontal cleavage portion. A core material piece having a substantially concave shape in plan view having a door portion along the lateral cleavage portion and a pair of arms located on both sides of the door portion and extending along the vertical cleavage portion; And a core material piece having a substantially convex shape in a plan view having the other door portion along the surface, and a surface of the one piece of the core material piece having a substantially concave shape in a plan view facing one surface side of the core material. An outer bend is formed and the flat surface is formed on the other surface side of the pair of arm portions in the core material piece having a substantially concave shape in plan view. A substantially convex core material piece is abutted and locked, and one of the door portions formed with the out-of-plane bending is bent toward the other surface side of the core material to engage with the other surface side of the other door portion. The airbag device for a vehicle, wherein the core piece having a substantially concave shape in plan view and the core piece having a substantially convex shape in plan view are stopped by stopping. 2. A core material piece having a substantially convex shape in a plan view is abutted and locked to tips of the pair of arms on the other surface side of the core material piece having a substantially concave shape in a plan view. The vehicle airbag device according to claim 1. 3. A core material piece having a substantially convex shape in plan view abuts and engages with a side surface along the vertical cleavage portion of the pair of arms on the other surface side of the core material piece having a substantially concave shape in plan view. The vehicle airbag device according to claim 1, wherein the airbag device is used.