JPH10211830A - Instrument panel integrally having air bag door part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent separation of a foaming layer or a skin in the case of inflating a bag unit of an air bag. SOLUTION: An air bag door part 10A comprises a skin 30 which is a part of a skin 16 of an instrument panel 10, door insert 32, and a foaming layer 34, which is a part of a foaming layer 20 of the instrument panel 10, with which between a skin 30 and the door insert 32 is charged. In a boundary part between the skins 16, 30, a U-shaped groove part 42 is formed, a bottom part thereof is formed as a rupture part 44. An extended part 46 formed in a peripheral edge part of the door insert 32 is protruded by a prescribed amount L from a downward position of the rupture part 44 to a peripheral side of the air bag door part, a bag unit of an air bag is formed so as to press the foaming layer 34 in the vicinity of the rupture part 44 and the skin 30 through the extended part 46 in an extending direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrument panel having an airbag door unit integrally therewith.
TECHNICAL FIELD The present invention relates to an instrument panel integrally provided with an airbag door portion mounted on an automobile.

[0002]

2. Description of the Related Art An example of a structure in which an airbag door portion of an airbag device for a passenger seat is integrated with an instrument panel is disclosed in Japanese Utility Model Laid-Open No. 5-58517.

As shown in FIG. 7, in an instrument panel integrally having an airbag door portion, an instrument panel 100 has a three-layer structure of an instrument panel insert 102, a foam layer 104, and a skin 106. An opening 108 is formed in a predetermined portion of the instrument panel insert 102 on the passenger seat side. An airbag device 112 that inflates the airbag body 110 toward the passenger seat when a predetermined high load is applied is provided at a position facing the opening 108.

[0004] Instrument panel insert 102
Door inserts 114 and 116 are fixed to the openings 108 by fixing means 118 such as rivets, so that the openings 108 are closed. In the vicinity of the boundary between the door inserts 114 and 116 in the outer skin 106, a break portion 12 serving as a break line when a predetermined high load is applied is provided.
0 is formed. The breaking portion 120 is bent in a U-shaped cross section, and when a predetermined high load is applied, the breaking portion 120 breaks and the airbag inserts 114 and 116 are deployed.

[0005]

However, in an instrument panel having such an airbag door unit integrally, as shown in FIG. 8, an airbag bag 110 is provided.
The door insert 114 (door insert 116
When airbag bag 110 is pressed and deployed, airbag bag body 110 comes into contact with foam layer 104 and skin 106 and lifts foam layer 104 and skin 106 in the deployment direction. 114, 1
It is also conceivable that the skin 106 peels off from the foam layer 104 from FIG.

The present invention has been made in consideration of the above-described circumstances, and has as its object to obtain an instrument panel integrally having an airbag door portion that can prevent peeling of a foam layer or a skin when an airbag bag inflates. is there.

[0007]

According to the present invention, there is provided an instrument panel insert having an inflating opening of an airbag bag which inflates when a predetermined high load is applied, and the instrument panel insert. An airbag door comprising: a door insert disposed at a bulging opening; a foam layer disposed on the instrument panel insert and the door insert; and a skin covering a surface of the foam layer. An instrument panel having an integral part, a groove formed in the outer skin and having a break at the bottom that breaks due to the inflation pressure of the airbag body, and a groove provided at an outer peripheral edge of the door insert. An extended portion protruding from the lower position by a predetermined amount toward the outer peripheral side of the airbag door portion is provided.

Therefore, when the airbag body is deployed, the airbag body comes into contact with the door insert, and is protruded from the position below the break part toward the outer periphery of the airbag door part by a predetermined amount, so as to be in the vicinity of the break part. Is pressed in the developing direction. Therefore, the airbag bag does not directly contact the foam layer or the skin, and thus the peeling of the foam layer or the skin can be prevented.

According to a second aspect of the present invention, in the instrument panel integrally having the airbag door portion according to the first aspect, the extended portion is made thick, and the rear surface of the extended portion faces the front end of the extended portion. And a guide surface inclined toward the epidermis is formed.

Therefore, when the airbag body is deployed, the airbag body is guided along the guide surface formed on the back surface of the door insert and is deployed in a desired direction.

According to a third aspect of the present invention, there is provided an instrument panel integrally having the airbag door portion according to the first aspect, wherein the door insert has a corner portion and a corner portion in plan view. It is characterized in that the opposing breaking portions are curved, and the curvature of the corner portion is gentler than the bending of the breaking portion.

Therefore, at the corner of the broken portion of the foam layer and the skin where the tearing direction changes suddenly when the airbag bag is deployed, the curvature of the corner portion of the door insert is gentler than the curvature of the broken portion. Abrupt changes in the tear direction acting on the layer and the skin can be suppressed, and the foamed layer and the skin can be reliably broken along the broken part.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an instrument panel having an airbag door unit according to the present invention is shown in FIGS.
This will be described with reference to FIG.

In the drawings, an arrow FR indicates a vehicle forward direction, an arrow UP indicates a vehicle upward direction, and an arrow IN indicates a vehicle width inside direction.

As shown in FIG. 3, an airbag door portion 10A facing the airbag device 12 disposed inside the instrument panel 10 is formed on the passenger seat side of the instrument panel 10 of the present embodiment. Have been.

As shown in FIG. 2, the instrument panel 10 is made of resin (for example, PVC (PVC), TPO (olefin-based thermoplastic elastomer), urethane-based thermoplastic elastomer, etc.) disposed inside the vehicle cabin. A skin 16 made of a soft resin), an instrument panel insert 18 which is disposed apart from the skin 16 and is made of PPG (composite reinforced polypropylene), ASG (composite reinforced acrylonitrile styrene) or the like;
6 and a foam layer 20 made of thermoplastic urethane or the like filled between the instrument panel insert 18. Therefore, the skin 16 has relatively low strength, while the instrument panel insert 18 has relatively high strength.

At a predetermined position of the instrument panel insert 18 of the instrument panel 10 described above,
An opening 22 is formed. The airbag device 12 is provided at a position where the opening 22 is formed. The airbag device 12 includes a substantially box-shaped airbag case 24, a substantially columnar inflator 26 fixed in the airbag case 24, and an airbag disposed in a folded state on the opening 22 side of the inflator 26. And a bag 28.

The airbag door 10A is made of a resin 30 which is the same material as the instrument panel insert 18 and a skin 30 which is also a part of the skin 16 of the instrument panel 10 described above. It comprises a door insert 32 and a foam layer 34 which is filled between the skin 30 and the door insert 32 and is also a part of the foam layer 20 of the instrument panel 10.

The airbag case 24 is substantially box-shaped, and its open end is bent in a direction away from each other to form a flange 24A. In the airbag case 24, the flanges 24 </ b> A are fixed to the instrument panel insert 18 by fixing members 36 such as bolts and nuts, so that a stay (not shown) is formed into a vehicle frame member such as a tubular instrument panel reinforcement. It is attached by being fixed. Of these, the flange portion 24A on the front side of the vehicle
About door insert 3 of airbag door part 10A
It is tightened together with 2. Thus, the airbag door portion 10A is a so-called one-sided door portion in which the vicinity of the joint portion functions as the hinge portion 38 when the airbag door is deployed.

The inflator 26 has a substantially cylindrical shape, and a mechanically-ignited airbag sensor (not shown) for detecting a sudden deceleration of the vehicle is provided on a side portion thereof. A not-shown squib is provided on the movement locus of the firing pin of the airbag sensor inside the inflator 26. An enhancer (fire transfer agent) is provided around the detonator, and a gas generating agent is accommodated in the outer periphery thereof. Note that an electric ignition type airbag sensor may be used in place of the mechanical ignition type airbag sensor described above. In this case, sensors for detecting a sudden deceleration state of the vehicle are not provided in the inflator, but are provided on both sides of the front of the vehicle, near the lower portion of the console box, and the like. When the inflator 26 having the above-described structure operates when a predetermined high load is applied, the airbag bag 28 housed in the airbag case 24 in a folded state is inflated.

As shown in FIG. 1, the epidermis 16 and the epidermis 30
A U-shaped groove 42 is formed at the boundary between the two.
The bottom of this groove 42 is thinner than other parts,
The rupture portion 44 is ruptured by the inflation pressure of the airbag body 28. In the present embodiment, the break portion 44 is formed on the entire circumference of the airbag door 14, but the hinge portion 38
It may be formed only in the portion excluding.

An extended portion 46 is formed on the outer peripheral edge of the door insert 32 except for the hinge portion. The extended portion 46 is located at a position below the break portion 44 on the outer peripheral side of the airbag door portion. A predetermined amount L. Therefore, when the airbag bag body is deployed, the airbag bag body 28 extends.
The foam layer 34 and the skin 30 in the vicinity of the rupture portion 44 are pressed in the developing direction (upward in FIG. 1) through the opening.

In this embodiment, the door insert 3
The thickness M1 of the second extending portion 46 is thicker than the thickness M2 of the main body of the door insert 32 (M1> M2). A guide surface 48 that is inclined toward the skin 16 toward the tip is formed,
When the airbag body is deployed, the airbag body 28 is guided along the guide surface 48 and is deployed in a desired direction.

As shown in FIG. 5, in the present embodiment, furthermore, in plan view of the door insert 32, a corner portion 32A on the vehicle rear side and a corner of the break portion 44 facing the corner portion 32A. The portion 44A is curved, and the curvature (the radius of curvature R1) of the corner portion 32A is gentler (R1> R2) than the curvature (the radius of curvature R2) of the corner 44A of the breakage portion 44. For this reason, the foam layers 20 and 34 and the skins 16 and 3 near the corners 44 </ b> A of the fractured portions 44 are formed.
At 0, a rapid change in the tearing direction during deployment of the airbag body can be suppressed.

In the vicinity of the break portion 44, a rib 50 provided on the upper surface of the door insert 32 except for the hinge portion is provided.
Are disposed adjacent to each other, and the foam layer 34 between the top wall 50A of the rib 50 and the skin 30 is thin.

Next, the operation of the present embodiment will be described. When a predetermined high load is applied, that is, when the vehicle suddenly decelerates, an airbag sensor (not shown) detects this and ignites the primer. Therefore, the gas generating agent burns through the enhancer, and a large amount of gas is generated. Therefore, the airbag 2
8, the airbag door portion 10A is pressed from the back side.

At this time, the bulging load (inflation pressure) from the airbag bag 28 is transmitted to the door insert 32 of the airbag door portion 10A. Also, the top wall 50A of the rib 50
This facilitates transmission of this load to the break portion 44.

In this embodiment, the door insert 3
Since the extended portion 46 formed on the outer peripheral edge of the airbag 2 projects a predetermined amount L from the position below the break portion 44 to the outer peripheral side of the airbag door portion, as shown in FIG. Then, the airbag body 28 presses the foam layer 34 and the skin 30 in the vicinity of the break portion 44 via the extension 46 in the developing direction (upward in FIG. 1). Therefore, the airbag bag 28 does not directly contact the foam layer 34 or the skin 30, and the foam layer 34 does not peel off from the skin 30 and the foam layer 34 does not come off from the door insert 32. And epidermis 3
0 reliably breaks as scheduled along the set breaking portion 44.

Further, in this embodiment, as shown in FIG. 5, a portion 32 of the door insert 32 which is a corner portion in plan view is provided.
A and the break portion 44 facing the corner portion 32A
Corner portion 44A is curved and is a corner portion 3
2A of curvature (radius of curvature R1)
A is gentler than the curvature of A (radius of curvature R2) (R1>
R2). As a result, in the foam layers 20, 34 and the skins 16, 30 near the corner 44A of the break 44, it is possible to suppress a rapid change in the tearing direction when the airbag body is deployed. Also in the foam layer 34
Then, the skin 30 surely breaks along the set breaking portion 44 as scheduled.

Further, in this embodiment, as shown in FIG. 4, a guide surface 48 is formed on the back surface of the extension 46 of the door insert 32. As a result, when the airbag body is deployed, the airbag body 28 is guided along the guide surface 48 and is deployed in a desired direction, so that the deployment of the airbag body 28 is stabilized.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to such an embodiment, and various other embodiments are included within the scope of the present invention. It is clear to a person skilled in the art that is possible. For example, in the present embodiment, as shown in FIG.
The corner portion 32A of the door insert 32, which is a corner portion on the vehicle rear side in plan view, and the corner portion 44A of the break portion 44 facing the corner portion 32A are gently curved, and the corner portion 32A is curved. (Curvature radius R1)
(R1> R2) instead of the curvature (radius of curvature R2) of the corner 44A, but instead of this, as shown in FIG. 6, the curvature (radius of curvature R3 of the corner 32A of the door insert 32). ) Is increased to suppress a sudden change in the tearing direction when the airbag bag is deployed, and
Also at the corner 44A of the fourth part, the foam layer 34 and the skin 30 may be surely broken along the set breaking part 44 as scheduled.

[0032]

According to the first aspect of the present invention, there is provided an instrument panel insert having an inflating opening of an airbag bag which inflates when a predetermined high load is applied, and an inflating opening of the instrument panel insert. Instrument panel integrally including an airbag door portion including: a door insert disposed on the instrument panel; a foam layer disposed on the instrument panel insert and the door insert; and a skin covering the surface of the foam layer. A groove formed in the skin and having a break at the bottom that breaks due to the inflation pressure of the airbag bag body, and a groove provided at the outer peripheral edge of the door insert from a position below the break to an outer peripheral side of the airbag door. An excellent effect of being able to prevent the foam layer or the epidermis from being peeled off when the airbag bag is inflated because it has an extended portion that protrudes in a fixed amount. A.

According to a second aspect of the present invention, there is provided an instrument panel having the airbag door unit according to the first aspect, wherein the extended portion has a large thickness, and a skin is provided on the rear surface of the extended portion toward the tip of the extended portion. Because the guide surface is inclined to the side,
In addition to the effects described in claim 1, there is an excellent effect that the deployment of the airbag bag is stabilized.

According to a third aspect of the present invention, there is provided an instrument panel integrally having the airbag door portion according to the first aspect, wherein the door insert faces a corner portion in plan view and faces the corner portion. Since the breaking portion to be bent is curved, and the curvature of the corner portion is gentler than the curvature of the breaking portion, in addition to the effect of claim 1, the foam layer and the skin are reliably formed along the breaking portion. It has an excellent effect that it can be broken.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional side view showing a part of an instrument panel integrally having an airbag door portion according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG. 3;

FIG. 3 is a perspective view showing an instrument panel integrally having an airbag door portion according to one embodiment of the present invention, as viewed obliquely from the rear of the vehicle.

FIG. 4 is an operation explanatory view showing a part of an instrument panel integrally having an airbag door portion according to an embodiment of the present invention.

FIG. 5 is a schematic plan view showing a part of an instrument panel integrally having an airbag door according to an embodiment of the present invention.

FIG. 6 is a schematic plan view showing a part of an instrument panel integrally including an airbag door according to another embodiment of the present invention.

FIG. 7 is a side sectional view showing an instrument panel integrally having an airbag door portion according to a conventional embodiment.

FIG. 8 is an operation explanatory view showing a part of an instrument panel integrally having an airbag door portion according to a conventional embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Instrument panel 10A Airbag door part 12 Airbag device 16 Skin 18 Instrument panel insert 20 Foam layer 28 Airbag bag 30 Skin 32 Door insert 32A Portion of door insert which becomes a corner on the vehicle rear side in plan view 34 Foam layer 42 Groove portion 44 Break portion 44A Corner portion of break portion 46 Extended portion 48 Guide surface

Claims (3)

[Claims] 1. An instrument panel insert having an inflating opening of an airbag bag which inflates when a predetermined high load is applied, a door insert disposed in the inflating opening of the instrument panel insert, A foam layer disposed on the instrument panel insert and the door insert; and a skin covering the surface of the foam layer. A groove formed in the outer skin and having a break at the bottom that breaks due to the inflation pressure of the airbag bag body; An instrument panel integrally having an extended portion and an airbag door portion provided with the airbag door portion. 2. The airbag door according to claim 1, wherein the extended portion is made thick, and a guide surface is formed on the back surface of the extended portion, the guide surface being inclined toward the skin side toward the tip of the extended portion. Instrument panel with integrated part. 3. The corner portion of the door insert in a plan view and the breaking portion facing the corner portion are curved, and the curvature of the corner portion is a curvature of the breaking portion. 2. The instrument panel according to claim 1, wherein the airbag door is integrally formed.