JP2000318557A - Lid part structure of air bag device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent scattering of a skin, even when the skin is temporarily embrittled at low temperatures, cracks grow on the skin at the time when a bag main body is developed or brittle fracture is caused, by fastening a sheet for prevention of skin layer scattering on the back surface side of the skin of a lid part manufactured by powder slush. SOLUTION: A lid part 2 of an air bag device is furnished with at least a skin 3 and a core material 4, manufactured by powder slush and furthermore has a full pat structure to cover the whole of the core material 4 with the skin 3 and a foaming layer 5. A sheet 18 for prevention of skin layer scattering is fastened on the back surface side of a forming portion of a cleaved groove 16 of the skin 3 at least on the lid part 2. A monolayer body 19 of either of woven cloth, nonwoven cloth of PVC and EPR mixture, etc., and a thermoplastic elastomer sheet material of a PVC system, etc., is used as the sheet 18 for prevention of skin layer scattering. Scattering of the skin is prevented at development of air bag, by using a material an elongation percentage at a low temperature of which is comparatively high as the sheet 18 for prevention of skin layer scattering in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid structure of a vehicle airbag device.

[0002]

2. Description of the Related Art In recent years, it has become popular to provide an airbag device also on the passenger side of an automobile. Various airbag devices have been proposed for the airbag device provided on the passenger seat side.

[0003] The above airbag device is inserted and arranged inside an instrument panel on a passenger seat side located below a windshield of an automobile.

This airbag device has a lid part integrally formed with an instrument panel, and has an airbag module disposed below the lid part and fixed to a vehicle body member.

[0005] When the bag body provided in the airbag module is inflated, a part of the lid portion is firstly cleaved by the pressure of the inflation to form an inflated opening, and at the same time, the bag body is opened from the inflated opening. However, it bulges toward the rear of the vehicle body diagonally. As a result, the bag body receives the head and the like of the occupant on the passenger seat side, and protects the head and the like from coming into contact with the instrument panel and the like.

In such a conventional airbag device, since the lid portion is made of resin, the resin constituting the lid portion (particularly, the skin portion of the lid portion) becomes brittle at low temperature, that is, so-called low-temperature embrittlement. May cause. If the resin undergoes low-temperature embrittlement in this way, the low-temperature embrittlement lid may be scattered when the bag body is deployed.

Therefore, as a countermeasure, conventionally, a resin material such as a TEO material which is not easily brittle at a low temperature is used for the lid part, especially for the skin part of the lid part.

[0008]

As a countermeasure for preventing the lid portion from being scattered when the bag body is unfolded, a resin such as a TEO material which is unlikely to become brittle at a low temperature at least in the skin portion of the lid portion as described above has been conventionally used. We use materials, but there is room for further improvements.

In particular, in the case where the skin portion of the lid portion is manufactured by so-called powder slush, in which a resin powder is put into a heated mold and a powder layer is melted and adhered to the surface of the mold. Therefore, the necessity of the above measures is further increased.

Accordingly, an object of the present invention is to provide a lid structure of a vehicle airbag device which can solve the above-mentioned problems and can surely prevent the skin portion from scattering when the bag body is deployed. It is in.

[0011]

According to the first aspect of the present invention, there is provided an airbag apparatus for a vehicle having at least a skin and a core material manufactured by powder slash on a lid portion. In the lid portion structure, a sheet for preventing skin layer scattering is fixed to the back side of the skin.

According to the first aspect of the present invention, the sheet for preventing the skin layer from scattering is fixed to the back side of the skin of the lid part manufactured by powder slash. Can be reliably prevented from being scattered even if the skin is cracked or the skin is brittlely broken when the bag body is unfolded due to low temperature embrittlement.

The invention according to claim 2 is characterized in that the skin layer scattering preventing sheet is a single-layered body of a woven fabric, a nonwoven fabric, or a thermoplastic elastomer sheet material.

According to the second aspect of the present invention, a bag is provided by using any one of a woven fabric, a nonwoven fabric, and a thermoplastic elastomer sheet material as the skin layer scattering prevention sheet. It is possible to reliably prevent the epidermis from scattering when the main body is deployed.

In particular, when a woven fabric or a nonwoven fabric is used as the skin layer scattering prevention sheet, since the woven fabric or the nonwoven fabric has air permeability, when the skin layer scattering prevention sheet is fixed to the skin, the skin and the skin are prevented from coming into contact with each other. Air bubbles can be prevented from being generated in the boundary layer between the layer and the sheet for preventing scattering. In addition, since the woven or nonwoven fabric has irregularities on the surface, a large contact area with the skin can be secured and an anchor effect can be obtained. Therefore, high fixability to the epidermis can be obtained. Similarly, since an anchor effect is also generated between the woven or nonwoven fabric and the foamed layer, it is effective in preventing the foamed layer from scattering.

[0016] In the invention according to the third aspect, as the sheet for preventing skin layer from scattering, at least two of a woven fabric, a nonwoven fabric, and a thermoplastic elastomer sheet material constituting the single-layer body are laminated. It is characterized by using a layered body.

According to the third aspect of the present invention, as the sheet for preventing the skin layer from scattering, a multilayer body obtained by laminating at least two of a woven fabric, a nonwoven fabric, and a thermoplastic elastomer sheet material. By using, it is possible to obtain a higher effect of preventing the epidermis from being scattered than when using a single-layer body.

[0018] In the invention described in claim 4, the single-layer body or the multi-layer body is inserted into the elastic reinforcing sheet for reinforcing the skin and increasing elasticity as the skin layer scattering prevention sheet. It is characterized by using a complex.

According to the fourth aspect of the present invention, as the sheet for preventing the skin layer from scattering, a composite in which the single-layer body or the multilayer body is inserted into an elastic reinforcing sheet is used. Thereby, a higher effect of preventing skin from scattering can be obtained as compared with the case where a single-layer body or a multi-layer body is used. And since the lid part is reinforced by the elastic reinforcing thin plate,
It is also possible to prevent deformation and sticking of the lid due to insufficient rigidity when a force acts on the lid from above.

According to a fifth aspect of the present invention, an air vent is formed in the skin layer scattering prevention sheet.

According to the fifth aspect of the present invention, by forming an air vent on the skin layer scattering prevention sheet, the skin and the skin layer scattering are fixed when the skin layer scattering prevention sheet is fixed to the skin. It is possible to prevent air bubbles from being generated in the boundary layer with the prevention sheet. In addition, the contact area with the skin can be increased by an amount corresponding to the formation of the air vent, and the anchor effect can be obtained.
Therefore, high fixability to the epidermis can be obtained.
In addition, air vent is effective as long as it is uneven, even in the shape of a pear grain or a leather grain.

In particular, when a thermoplastic elastomer sheet material is used as the skin layer scattering prevention sheet, air bleeding is effective.

According to a sixth aspect of the present invention, the cutout serving as a cleavage groove is previously formed in the skin layer scattering prevention sheet.

According to the sixth aspect of the present invention, a notch serving as a cleavage groove is previously formed in the skin layer scattering prevention sheet, so that a cleavage groove is formed after the lid portion is completed. This saves time and effort.

According to a seventh aspect of the present invention, a connecting portion is appropriately formed in the middle of the cut.

According to the invention according to claim 7 configured as described above, by appropriately forming a connecting portion in the middle of the cut, a portion cut off by the cut can be connected, so that the outer skin is formed. This portion is prevented from sagging when the layer scattering prevention sheet is attached.

[0027] In the invention according to claim 8, the sheet for preventing skin layer scattering has a tensile strength at -40 ° C of 250.
× 9.8 N / cm ² (250 kgf / cm ² ) to 500 ×
9.8 N / cm ² (500 kgf / cm ² ), elongation percentage is 50% or more, and tear strength is 10 × 9.8 N / cm ²
(10 Kgf / cm ² ) or more and a tensile strength at 23 ° C. of 50 × 9.8 N / cm ² (50 Kgf / cm ² ) to 100
× 9.8 N / cm ² (100 kgf / cm ² ), elongation percentage is 100% or more, and tear strength is 10 × 9.8 N / c.
m ² (10 kgf / cm ² ) or more and a tensile strength at 85 ° C. of 10 × 9.8 N / cm ² (10 kgf / cm ² ) to 10
0 × 9.8 N / cm ² (100 kgf / cm ² ), elongation percentage is 150 to 500 (%), and tear strength is 5 × 9.8 N.
/ Cm ² (5 kgf / cm ² ) or more.

[0028] According to the invention according to claim 8 configured as described above, by using a material having a relatively high elongation at a low temperature as the sheet for preventing skin layer scattering, scattering of the skin during deployment of the airbag is achieved. Can be prevented. Further, by using a material having a relatively low elongation at high temperatures as the skin layer scattering prevention sheet, it is possible to prevent the development time from being delayed.

The ninth aspect of the present invention is characterized in that the pre-heated skin layer scattering prevention sheet is fixed to a portion corresponding to the back surface side of the epidermal layer forming the epidermis. .

According to the ninth aspect of the present invention, the use of the preheated skin layer scattering prevention sheet makes it possible to achieve a higher melting point than when the skin layer scattering prevention sheet is used without heating. The adhesiveness is further improved, and the shrinkage and deformation after cooling and solidification can be reduced by using the sheet for preventing skin layer scattering prevention in advance by heating and heat shrinking the sheet.

[0031] The invention according to claim 10 is characterized in that the skin layer scattering preventing sheet is made of a woven or non-woven fabric, and the temperature for preheating it is 60 ° C to 260 ° C.

According to the invention according to claim 10 having the above-mentioned structure, when the skin layer scattering prevention sheet is made of a woven or non-woven fabric, it is heated to 60 ° C. to 260 ° C. in advance. An optimal fused state can be obtained.

[0033] In the eleventh aspect, the skin layer scattering prevention sheet is made of a thermoplastic elastomer sheet material, and the temperature for preheating the sheet is 60 ° C to 2 ° C.
It is characterized by a temperature of 30 ° C.

According to the eleventh aspect of the present invention, when the skin layer scattering prevention sheet is made of a thermoplastic elastomer sheet material, the temperature is preferably set to 60 ° C. to 2 ° C.
By heating to 30 ° C., an optimal fused state can be obtained.

According to the invention described in claim 12, the thermoplastic elastomer sheet material is made of PVC, TPU,
Or a TEO type.

According to the twelfth aspect of the present invention, the thermoplastic elastomer sheet material includes:
Optimum conditions can be obtained by using any of the PVC, TPU or TEO systems.

According to a thirteenth aspect of the present invention, in a lid structure of a vehicle airbag device having at least a skin and a core material in a lid part, a reinforcing material is fixed to a back side of the core material. Features.

According to the invention according to the thirteenth aspect, the reinforcing member is fixed to the back surface side of the core member, whereby the lid portion due to insufficient rigidity when a force acts on the lid portion from above. Can be prevented from being deformed or sticky. Further, a reinforcing material can be attached at the time of manufacturing the lid portion.

[0039]

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

FIG. 1 to FIG. 9 show a first embodiment of the present invention.

First, the structure will be described. In the first embodiment, the instrument panel 1 shown in FIG.
Is fitted with a lid part 2 of an airbag device. As shown in FIG. 2, the lid portion 2 includes at least a skin 3 and a core material 4 manufactured by powder slash, and in FIG. 2, a full pad that covers the entire core material 4 with the skin 3 and the foam layer 5. It has a structure.

The lid portion 2 is provided with a single aluminum door member 7 capable of substantially closing the opening 6 formed in the core member 4 on the back surface side. Further, a reinforcing guide 8 made of aluminum capable of substantially supporting the peripheral portion of the door member 7 from the rear surface side of the core member 4 is attached to the door member 7 so as to be retrofittable. The door member 7 and the reinforcing guide 8 are shaped as shown in FIG.
Is fixedly fastened to the boss portion 10 formed at the bottom.

The door member 7 has a screw mounting surface 11, a hinge portion 12, and a door body 13 which is substantially flush with the core member 4 in the opening 6, and serves as a free side of the door body 13. A seal tape 15 is adhered to a gap 14 between the outer periphery of the three sides and the opening 6, and a seal groove 15 having a depth reaching the seal tape 15 and the foam layer 5 or a part of the skin 3. Are formed.

The cleavage grooves 16 may be formed by laser processing, may be processed by a hot blade, or cuts may be made in advance in each component to form the cleavage grooves 16, and these parts are positioned and formed. You may do it. In the case of FIGS. 2 and 3, the cleavage groove 16 is substantially U-shaped in plan view.

Further, below the door body 13, an airbag module 17 is disposed.

In the first embodiment, the skin layer scattering prevention sheet 18 is fixed to at least the rear surface side of the cut portion 16 of the skin 3 in the lid portion 2 manufactured by powder slash.

The sheet 18 for preventing scattering of the skin layer has -40
The tensile strength at 250 ° C. is 250 × 9.8 N / cm^Two(250K
gf / cm^Two) To 500 × 9.8 N / cm^Two(500kg
f / cm^Two), The elongation percentage is 50% or more, and the tear strength
Is 10 × 9.8 N / cm^Two(10Kgf / cm^Two)that's all
And the tensile strength at 23 ° C. is 50 × 9.8 N / cm^Two(5
0Kgf / cm^Two) To 100 × 9.8 N / cm^Two(100
Kgf / cm^Two), The elongation is 100% or more,
Tensile strength is 10 × 9.8N / cm^Two(10Kgf / cm^Two)
As described above, the tensile strength at 85 ° C. is 10 × 9.8 N / cm^Two
(10Kgf / cm ^Two) To 100 × 9.8 N / cm^Two(1
00Kgf / cm^Two), The elongation is 150-500
(%) And the tear strength is 5 × 9.8 N / cm^Two(5Kgf
/ Cm^Two) Use the above materials. For example, skin layer scattering prevention
Woven cloth, non-woven cloth, thermoplastic elastomer
Any single-layer body 19 of the tomer sheet material is used. this
Elongation at low temperature as the skin layer scattering prevention sheet 18
By using materials with a relatively high rate, airbag exhibition
At the time of opening, scattering of the epidermis can be prevented. Also the epidermis
The sheet 18 for layer scattering prevention has a relatively high elongation at high temperatures.
Using a low material will slow down the deployment time
Can be prevented.

The nonwoven fabric is made of a mixed material of PVC and EPR, a mixed material of PVC and EPDM, a mixed material of PP and EPDM.
Mixed material, PP and EP rubber mixed material, TEO material, P
A (polyamide 6 nylon / 66 nylon) material, TEE
E (TAEE) polyester or carbon fiber is used.

The above thermoplastic elastomer sheet material is made of P
Any of VC, TPU and TEO (TPO thermoplastic olefin) materials are used.

The above-mentioned PVC-based thermoplastic elastomer sheet material comprises PVC, at least one of a phthalic acid-based plasticizer and a trimellitate-based (trimellitic acid ester) plasticizer, and a styrene-based rubber (such as S.E.B.S.). A composite material with the above, and a composite material with EP rubber, the above,
There is a composite material with EPDM.

The TEO-based thermoplastic elastomer sheet material has a rubber component dispersed in a PP material (polypropylene).

Such a thermoplastic elastomer sheet material is manufactured by a calender molding machine or the like. Further, when a thermoplastic elastomer sheet material is used, FIG.
As shown in FIG. 5 (b) and FIG. 5 (a), it is preferable to form air vents 20 such as irregularities, grooves, and through holes on the surface fixed to the skin 3. In addition, the air vent 20
It is effective even in the shape of a pear grain or leather grain as long as it is uneven.

As described above, when the cuts to be the cleavage grooves 16 are made in advance in the respective components, and these are positioned and formed, the sheet 1 for preventing the skin layer from scattering is used.
8 is provided with a substantially U-shaped cut 21 in plan view as shown in FIGS. 5 (b) and 5 (c). In this manner, by forming the cuts 21 serving as the cleavage grooves 16 in the skin layer scattering prevention sheet 18 in advance, the labor of forming the cleavage grooves 16 after the lid portion 2 is completed can be omitted. FIG.
5B shows the case where there is no air vent 20, and FIG. 5C shows the case where there is the air vent 20.

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

First, the skin 3 of the lid portion 2 is manufactured by powder slash (P / S). The skin 3 of the lid portion 2 is manufactured according to the procedure shown in FIGS.

First, as shown in FIG. 6A, a P / S type (powder slash mold) 22 for molding the skin 3 of the lid portion 2 is heated by hot air H. The heating temperature at this time is generally from 160 ° C to 300 ° C. TE
In the case of O material (TPO material thermoplastic olefin), the temperature is desirably set to 260 ° C to 300 ° C. Similarly, in the case of TPU (urethane-based thermoplastic elastomer), the temperature is desirably 260 ° C to 320 ° C. In the figure, reference numeral 23 denotes a flange at the periphery of the opening of the P / S type 22.

On the other hand, as shown in FIG. 6 (b), a powder box 24 having an opening facing upward is prepared in advance, and a material for P / S, that is, a resin powder for powder slash (powder-like) is prepared. Resin powder) 25 is placed in powder box 24. In the figure, reference numeral 26 denotes a flange at the periphery of the opening of the powder box 24.

Then, the P / S type 2 heated in FIG.
Of the powder box 24 with the flange 2 of the powder box 24
According to 6, the opening of the P / S type 22 is matched with the opening of the powder box 24, and the flanges 23 and 26 are held or fixed by holding means or fixing means (not shown).

In this state, the P / S type 22 and the powder box 24 are moved to the P / S type as shown by the arrow 27 in FIG.
The powder-type resin powder 25 in the powder box 24 is dropped into the P / S type 22 by rotating the S-type 22 about a horizontal axis (not shown) so as to be on the lower side. On this occasion,
Among the resin powders 25, those in contact with the surface of the P / S mold 22 are melted by the heat of the P / S mold 22 and adhere to the inner surface of the P / S mold 22 in the form of a thin film. As a result, a thin platinol skin layer 28 is formed on the inner surface of the P / S type 22.

Thereafter, the P / S type 22 and the powder box 24 are rotated about a horizontal axis (not shown) so that the P / S type 22 is located above, and the resin powder 2 in the P / S type 22 is rotated.
5 is dropped into the powder box 24, so that excess resin powder 25 in the P / S mold 22 is removed from the P / S mold 2.
2 Remove from inside.

Then, the P / S type 22 is removed from the powder box 24, and the cooling of the P / S type 22 is started.
In this cooling step, the P / S type 22 is still heated in the initial stage of cooling, so that the platinol skin layer 28 is in a molten (or semi-molten) state.

Therefore, at the beginning of this cooling step, when the thin platinol skin layer 28 is in a molten state,
The opening of the P / S type 22 is directed upward as shown in FIG. 6 (d), and a skin layer scattering prevention sheet 18 is prepared as shown in FIG. 6 (e). The sheet 18 is fused to the platinol skin layer 28 in a molten state as shown in FIG.

The fusion of the skin layer scattering prevention sheet 18 is performed by a robot arm 30 provided with a vacuum suction disk 29 as shown in FIG. In the figure, reference numeral 31 denotes a vacuum pump for applying a vacuum pressure to the vacuum suction disk 29.

When the skin layer scattering prevention sheet 18 is fused to the platinol skin layer 28, the entire skin layer scattering prevention sheet 18 is pressed against the platinol skin layer 28 by an air bag 32 as shown in FIG. Thereby, it is possible to easily conform to the complicated surface shape of the platinol skin layer 28. In FIG. 8, a bag holding plate 33 is attached to the tip of the robot arm 30, and an air bag 32 is attached to the bag holding plate 33.

The temperature of the platinol skin layer 28 at the time of fusing the skin layer scattering prevention sheet 18 is generally 160 ° C.
To 300 ° C. The sheet 18 for preventing skin layer scattering is TE
In the case of O material, the temperature of the platinisol skin layer 28 is 2
The temperature is desirably 60 ° C to 300 ° C. Similarly, when the skin layer scattering prevention sheet 18 is made of TPU (urethane-based thermoplastic elastomer), the temperature of the platinol skin layer 28 is desirably 260 ° C. to 320 ° C.

Further, the skin layer scattering prevention sheet 18 which is fused to the platinol skin layer 28 is also heated in advance. At this time, the heating temperature of the skin layer scattering prevention sheet 18 is set to 60 ° C. to 260 ° C. in the case of a woven or non-woven fabric.
In the case of an EO material, the temperature is set to 60 ° C to 230 ° C. Generally,
The workability is best when the temperature is about 130 ° C. As described above, the use of the pre-heated skin layer scattering prevention sheet 18 further improves the fusing property as compared with the case where the skin layer scattering prevention sheet 18 is used without heating, and also prevents the skin layer scattering prevention. By using the heating sheet 18 after heating and heat shrinking, sink and deformation after cooling and solidification can be reduced.

Then, as shown in FIG. 6 (g), the plastisol skin layer 28 is cooled and solidified to form the skin 3 to which the sheet 18 for preventing skin layer scattering is fixed on the back side. Is removed from the P / S type 22.

When the skin 3 is completed in this way, the skin 3 and the core 4 are set in a foaming mold 34 as shown in FIG. 9, and a foaming agent 35 is injected between the skin 3 and the core 4 to form this foam. Agent 3
The lid portion 2 is formed by foaming 5.

At this time, the door member 7
Is attached with a screw 9, a sealing tape 15 is applied between the core 4 and the periphery of the door member 7, and the foaming agent is set.
5 is not leaked. Thereby, the skin 3 and the core 4
And the door member 7 are integrally laminated via the foam layer 5.

After the lid portion 2 is formed, laser processing or hot cutting is performed along the peripheral edge of the door member 7 along the peripheral edge of the door member 7 at the gap 14 between the outer periphery of the three free sides of the door body 13 and the opening 6. , A cleavage groove 16 having a depth reaching the seal tape 15 and the foam layer 5 or a part of the skin 3 is formed. In addition, when the cut which becomes the cleavage groove | channel 16 is previously made in each component, and these are positioned and formed, as shown in FIG. The cut 21 is formed in a substantially U-shape when viewed.

Further, a reinforcing guide 8 is attached to the core member 4 with a screw 9 so as to substantially come into contact with the door member 7.

When the bag body provided in the airbag module 17 is inflated, the pressure of this inflation causes the skin 3 of the cleavage groove 16 to be broken, and the lid portion 2 rises up around the hinge portion 12 and expands. An opening will be formed.

As described above, according to the first embodiment,
Since the skin layer scattering prevention sheet 18 is fixed to the back side of the skin 3 of the lid part 2 manufactured by powder slash, if the skin 3 is low-temperature embrittlement, and the skin is unfolded when the bag body is unfolded. Even if cracks occur or the skin 3 is brittlely broken, the scattering of the skin 3 can be reliably prevented.

When a woven fabric or a non-woven fabric is used as the skin layer scattering preventing sheet 18, the woven fabric or the non-woven fabric has air permeability. , Skin 3 and skin layer scattering prevention sheet 18
Bubbles can be prevented from being generated in the boundary layer between the substrate and the substrate.
Moreover, since the woven or nonwoven fabric has irregularities on the surface, a large contact area with the skin 3 can be secured and an anchor effect can be obtained. Therefore, high fixability to the skin 3 can be obtained. Similarly, since an anchor effect is also generated between the woven or nonwoven fabric and the foam layer 5, the foam layer 5 is effectively prevented from scattering.

When a thermoplastic elastomer sheet material is used as the skin layer scattering prevention sheet 18, air vents 20 such as irregularities, grooves and through holes are formed on the surface of the thermoplastic elastomer sheet material fixed to the skin 3. By doing so, high adhesion to the skin 3 can be obtained as in the case of using a woven or nonwoven fabric. In addition, the air vent 20
Is effective as long as it is uneven, even in the shape of a pear grain or leather grain.

Then, during the manufacturing process of the powder slush skin 3, the skin layer scattering prevention sheet 18 is fused when the platinol skin layer 28 is in a molten state, thereby preventing the skin layer from scattering. Can be made at one time, and the step of attaching the skin layer scattering prevention sheet 18 to the skin 3 using an adhesive or a mold is omitted, and the manufacturing cost is reduced. Can be reduced.

It is also possible to heat the completed skin 3 to fuse the skin layer scattering prevention sheet 18.

[0078]

MODIFIED EXAMPLE As a modified example of the skin layer scattering preventing sheet 18, as shown in FIG. 10, a multi-layered body 36 obtained by laminating at least two of a woven fabric, a nonwoven fabric and a thermoplastic elastomer sheet material is used. be able to.

As described above, the skin layer scattering preventing sheet 18
A multilayer body 36 obtained by laminating at least two of a woven fabric, a nonwoven fabric, and a thermoplastic elastomer sheet material.
Is used, it is possible to obtain a higher scattering prevention effect of the epidermis 3 than when the single-layer body 19 is used.

As another modified example of the skin layer scattering preventing sheet 18, as shown in FIG.
For example, a composite 38 in which the multilayer body 36 is inserted into an elastic reinforcing thin plate 37 made of a foam or the like for reinforcing the skin 3 to increase elasticity can be used.

As described above, the skin layer scattering preventing sheet 18
The single-layer body 19 and the multi-layer body 36 are used by using a composite body 38 and the like in which the single-layer body 19 and the multi-layer body 36 are inserted into an elastic reinforcing thin plate 37 made of foam or the like. As compared with the case, a higher scattering prevention effect of the epidermis 3 can be obtained. In addition, since the lid portion 2 is reinforced by the elastic reinforcing thin plate 37, it is possible to prevent the lid portion 2 from deforming and sticking due to insufficient rigidity when a force acts on the lid portion 2 from above. In addition, even in the case of the single-layer body 19 or the multi-layer body 36 which does not use the elastic reinforcing thin plate 37, by attaching the reinforcing guide 8 to the door member 7, it is possible to obtain the effect of preventing the deformation and the sticking of the lid portion 2. it can.

The air vent 20 may be provided in the multilayer body 36 or the composite body 38.

[0083]

Second Embodiment FIGS. 12 to 14 show a second embodiment of the present invention. Note that the same or equivalent parts as those in the first embodiment are described with the same reference numerals.

According to the second embodiment, a lid made of powder slash is used for a lid portion 2 in which two door members 7 are used to form a substantially H-shaped cleavage groove 16 in plan view. The sheet 18 for preventing skin layer scattering is fixed to the back side of the sheet 3.

In the case where cuts to be the cleavage grooves 16 are made in advance in the respective components, and these are positioned and formed, the skin layer scattering prevention sheet 18 is provided as shown in FIG. A substantially H-shaped cut 2 in plan view
1 is formed.

Except for the above, the configuration is the same as that of the first embodiment, and the same operation and effect can be obtained.

[0087]

Third Embodiment FIG. 15 shows a third embodiment of the present invention. Note that the same or equivalent parts as those in the first embodiment are described with the same reference numerals.

The third embodiment has a partial pad structure in which a part of the core material 4 is covered with the skin 3 and the foam layer 5, and is substantially U-shaped in plan view similar to the first embodiment. Cleavage groove 1
6, a skin layer scattering prevention sheet 18 is fixed to the back side of the skin 3 manufactured by powder slash.

Lid 2 having this partial pad structure
Manufactures epidermis 3 by powder slash,
The sheet-shaped foam layer 5 and the skin 3 separately prepared are put into a vacuum mold, vacuum-formed into a required shape, and the obtained molded body (so-called two-layer skin) is bonded to the core material 4 or the like.

Except for the above, the configuration is the same as that of the first embodiment, and the same operation and effect can be obtained.

Although not particularly shown, the core material 4 has a partial pad structure in which a part of the core material 4 is covered with the skin 3 and the foam layer 5.
With respect to the lid portion 2 having the substantially H-shaped cleavage groove 16 similar to that in the second embodiment, the skin layer scattering prevention sheet 18 is fixed to the back surface side of the skin 3 manufactured by powder slash. It is also possible.

[0092]

Fourth Embodiment FIGS. 16 to 18 show a fourth embodiment of the present invention. Note that the same or equivalent parts as those in the first embodiment are described with the same reference numerals.

In the fourth embodiment, after the skin 3 is manufactured by powder slash, the separately formed sheet-like foam layer 5 and the skin 3 are placed in a vacuum forming mold and vacuum formed into a required shape. Molded body (so-called two-layer skin 3
9) and the resin door member 40 are set in an injection mold, and the resin serving as the core material 4 is injected between the two-layer skin 39 and the resin door member 40, whereby a resin door is formed. When the member 40 is insert-molded into the lid portion 2, the skin layer scattering prevention sheet 18 is fixed to the back side of the skin 3 manufactured by powder slash as described above.

The ribs 41 are attached to the door member 40 made of resin.
Is formed, and the ribs 4 are formed by the core material 4 formed by injection molding.
1 to improve the integrity of the door member 40 and the core member 4. In the figure, reference numeral 42 denotes a laser head for forming the cleavage groove 16.

[0095] Except for the above, Embodiments 1 to
3 and a similar operation and effect can be obtained.

Although the fourth embodiment exemplifies a case having the substantially H-shaped cleavage groove 16 in plan view, the fourth embodiment may have a substantially U-shaped cleavage groove 16 in plan view.

[0097]

Fifth Embodiment FIG. 19 shows a fifth embodiment of the present invention. Note that the same or equivalent parts as those in the first embodiment are described with the same reference numerals.

In the fifth embodiment, a connecting portion 45 is appropriately formed in the middle of the substantially U-shaped cut 21 which becomes the cleavage groove 16 of the skin layer scattering preventing sheet 18 in FIG. I have.

Thus, in the middle of the cut 21,
By appropriately forming the connecting portion 45, the central portion 64 separated by the cut 21 can be connected, so that the portion 46 is prevented from dropping.

Except for the above, the configuration is the same as that of the above embodiment, and the same operation and effect can be obtained.

[0101]

[Modification] FIGS. 20 and 21 show a modification of the fifth embodiment, in which the cleavage groove 1 of the sheet 18 for preventing skin layer scattering in FIG.
The connecting portion 45 is appropriately formed in the middle of the substantially H-shaped cut 21 which is 6. When the skin layer scattering prevention sheet 18 is a woven fabric, the folds of the woven fabric and the cuts 21 are aligned so as to be substantially parallel to each other, and the cuts 21 are substantially parallel to the side portions of the joint portion 45. Slit 47
Is formed. The length of the slit 47 is equal to or greater than the length of the connecting portion 45.

Thus, in the middle of the cut 21,
By appropriately forming the connecting portion 45, the central portion 64 separated by the cut 21 can be connected, so that the portion 46 is prevented from dropping when the sheet 18 for preventing skin layer scattering is attached. . When the skin layer scattering prevention sheet 18 is made of woven cloth, the slit 47 is formed on the side of the connecting portion 45 so that, when the airbag is deployed, as shown in FIG. Since the warp and the weft of the woven fabric can be removed so as to come off in the portion between the slits 47, the cut 21 having the connecting portion 45 can be torn without any trouble.

The sheet 1 for preventing skin layer scattering in FIG.
When 8 is a woven cloth, a cut 2
A slit 47 substantially parallel to 1 may be formed.

[0104]

Sixth Embodiment FIGS. 22 to 24 show a sixth embodiment of the present invention. Note that the same or equivalent parts as those of the fourth embodiment are described with the same reference numerals.

In the sixth embodiment, the reinforcing material 50 is fixed to the back surface side of the core material 4 of the lid portion 2 having at least the skin 3 and the core material 4.

In this case, the epidermis is a single-layer epidermis 3,
And a two-layer skin 39 having the skin 3 and the foam layer 5, a three-layer skin 52 having the skin 3, the foam layer 5 and the barrier layer 51.
And the like can be used.

The core 4 is made of polypropylene (P
P) mixed with synthetic rubber (EPR), talc (filler), or the like is used.

As the reinforcing member 50, a sheet material such as a woven fabric or a non-woven fabric is used. The woven fabric is made of 66 nylon or the like. The nonwoven fabric is made of PA (polyamide 6 nylon / 66 nylon), TEEE (TA
EE) A material made of a polyester material, carbon fiber, or the like is used. Further, in the reinforcing member 50, a fusion hole 53 is formed uniformly over the whole.

Specifically, the reinforcing member 50 is attached to the same resin-made door member 40 as in the fourth embodiment, and the door member 40 such as a TPE material to which the reinforcing member 50 is attached is formed by injection molding or injection press molding. The door member 40 made of resin is insert-molded into the core member 4 by setting the core member 55 of the mold 54 into the core member 55 and injecting the resin to be the core member 4 into the injection molding die or the injection press molding die 54.

At this time, the single-layer skin 3 and the multi-layer skin such as the two-layer skin 39 and the three-layer skin 52 are set in the cavity mold 56 of the injection mold or the injection press mold 54, and the lid part 2 is set. It may be formed integrally. Alternatively, only the core 4 may be injection-molded without setting the skin 3 in the cavity mold.

The door member 40 is made of polypropylene (P
P) mixed with synthetic rubber (EPR, EPDM)
An O material (TPO material) is used.

As described above, the reinforcing member 50 is fixed to the back surface side of the lid portion of the core member 4 so that when the force is applied to the lid portion 2 from above, the deformation of the lid portion 2 due to insufficient rigidity and the sticking of the lid portion 2 are caused. Can be prevented.

Further, a fusing hole 53 is formed in the reinforcing member 50. Thereby, an anchor effect is generated between the core 4 and the core 4, and the fusion property to the core 4 can be improved.

Further, the single-layered skin 3, the multilayered skin 39 and the triple-layered skin 52, etc. are set and molded in the cavity mold 56 of the injection molding die or the injection press molding die 54 to form a lid. The part 2 can be integrally formed.

[0115]

[Modification] FIG. 25 shows a modification of the sixth embodiment, in which the door member 40 has a multilayer structure. In particular,
The door member 40 has a three-layer structure having a foam layer 57 between layers 58, 58 of TPE material or the like.

As described above, by forming the door member 40 into a three-layer structure having the foam layer 57 between the layers 58, 58 of TPE material or the like, the foam layer 57 contracts and the Since the pressure is absorbed, it is possible to prevent the core 4 from cracking.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. Included in this invention. For example, combinations other than the above-described embodiments 1 to 6 are also possible.

[0118]

As described above, according to the first aspect of the present invention, the skin layer scattering prevention sheet is fixed to the back surface side of the skin of the lid part manufactured by the powder slash. Even if the skin is subjected to low-temperature embrittlement and the bag body is cracked or the skin is brittlely broken when the bag body is deployed, it is possible to reliably prevent the skin from scattering.

According to the second aspect of the present invention, by using any one of a woven fabric, a nonwoven fabric, and a thermoplastic elastomer sheet material as the skin layer scattering prevention sheet, the skin is scattered when the bag body is deployed. Can be reliably prevented.

In particular, when a woven fabric or a nonwoven fabric is used as the skin layer scattering prevention sheet, the woven fabric or the nonwoven fabric has air permeability. Air bubbles can be prevented from being generated in the boundary layer between the layer and the sheet for preventing scattering. In addition, since the woven or nonwoven fabric has irregularities on the surface, a large contact area with the skin can be secured and an anchor effect can be obtained. Therefore, high fixability to the epidermis can be obtained. Similarly, since an anchor effect is also generated between the woven or nonwoven fabric and the foamed layer, it is effective in preventing the foamed layer from scattering.

According to the third aspect of the present invention, as the sheet for preventing skin layer scattering, a multilayer body obtained by laminating at least two of a woven fabric, a nonwoven fabric, and a thermoplastic elastomer sheet material is used. It is possible to obtain a higher effect of preventing the epidermis from being scattered than when using a layered body.

According to the fourth aspect of the present invention, as the sheet for preventing skin layer scattering, a composite in which the single-layered body or the multilayered body is inserted into an elastic reinforcing thin plate is used. It is possible to obtain a higher effect of preventing the epidermis from being scattered as compared with the case where the multilayer body is used. Further, since the lid portion is reinforced by the elastic reinforcing thin plate, it is possible to prevent the lid portion from being deformed or sticking due to insufficient rigidity when a force acts on the lid portion from above.

According to the fifth aspect of the present invention, by forming an air vent on the sheet for preventing skin layer scattering, the boundary layer between the skin and the sheet for preventing skin layer scattering when the sheet for preventing skin layer scattering is fixed to the skin. Bubbles can be prevented from being generated. In addition, the contact area with the skin can be increased by an amount corresponding to the formation of the air vent, and the anchor effect can be obtained. Therefore, high fixability to the epidermis can be obtained. In addition, air vent is effective as long as it is uneven, even in the shape of a pear grain or a leather grain.

In particular, when a thermoplastic elastomer sheet material is used as the skin layer scattering prevention sheet, air bleeding is effective.

According to the sixth aspect of the present invention, by forming in advance a notch serving as a cleavage groove in the skin layer scattering prevention sheet, the labor for forming the cleavage groove after the lid portion is completed can be omitted.

According to the seventh aspect of the present invention, by appropriately forming a connecting portion in the middle of the cut, the portion cut off by the cut can be connected.
This portion is prevented from sagging when the sheet for preventing skin layer scattering is attached.

According to the eighth aspect of the present invention, the use of a material having a relatively high elongation at low temperature as the sheet for preventing skin layer scattering prevents the skin from scattering when the airbag is deployed. In addition, by using a material with a relatively low elongation at high temperature as a skin layer scattering prevention sheet,
The deployment time can be prevented from being delayed.

According to the ninth aspect of the present invention, the use of the pre-heated skin layer scattering prevention sheet further improves the fusing property as compared with the case where the skin layer scattering prevention sheet is used without heating. By heating and shrinking the skin layer scattering prevention sheet in advance and using it, cooling,
Sinking and deformation after solidification can be reduced.

According to the tenth aspect, in the case where the skin layer scattering prevention sheet is made of a woven or non-woven fabric, an optimum fused state is obtained by heating the sheet to 60 ° C. to 260 ° C. in advance. be able to.

According to the eleventh aspect of the present invention, when the skin layer scattering prevention sheet is made of a thermoplastic elastomer sheet material, it is heated to 60 to 230 ° C. in advance to obtain an optimal fusion state. Obtainable.

According to the twelfth aspect, an optimal state can be obtained by using any of PVC, TPU and TEO as the thermoplastic elastomer sheet material.

According to the thirteenth aspect of the present invention, the reinforcing member is fixed to the back surface side of the core material, thereby preventing deformation and sticking of the lid portion due to insufficient rigidity when a force acts on the lid portion from above. In practical use.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an instrument panel according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a lid part of FIG. 1;

FIG. 3 is a perspective view of a door member and a reinforcing guide of FIG. 1;

FIG. 4A is a partial side view of a skin layer scattering prevention sheet provided with an air vent, and FIG. 4B is a bottom view of FIG.

5 (a) is a plan view of the skin layer scattering prevention sheet of FIG. 2 having an air vent formed therein, FIG. 5 (b) is a plan view of the skin layer scattering prevention sheet of FIG. 2 having a cut formed therein, and FIG. 3) is a plan view of the skin layer scattering prevention sheet of FIG. 2 in which air vents and cuts are formed.

FIGS. 6 (a) to 6 (g) are diagrams showing a process for producing a powder slush skin.

FIG. 7 is a side view showing a state in which a skin layer scattering prevention sheet is fused to a platinol skin layer.

FIG. 8 is a side view showing a state in which the skin layer scattering prevention sheet is made to conform to the platinol skin layer.

FIG. 9 is a side view schematically showing a foaming mold for forming a foaming layer.

FIG. 10 is a view showing a modified example of the skin layer scattering prevention sheet.

FIG. 11 is a view showing another modified example of the skin layer scattering prevention sheet.

FIG. 12 is a side sectional view of a lid part according to the second embodiment of the present invention.

FIG. 13 is a perspective view of the door member and the reinforcing guide of FIG.

FIG. 14 is a plan view of the skin layer scattering prevention sheet of FIG. 12 in which cuts are formed.

FIG. 15 is a side sectional view of a lid part according to the third embodiment of the present invention.

FIG. 16 is a side sectional view of a lid part according to a fourth embodiment of the present invention.

FIG. 17 is a partially enlarged view of FIG. 16;

FIG. 18 is another partially enlarged view of FIG. 16;

FIG. 19 is a view similar to FIG. 5, according to a fifth embodiment of the present invention.

FIG. 20 is a view similar to FIG. 14 according to a modification of the fifth embodiment.

21 is an enlarged view of a portion A in FIG. 20;

FIG. 22 is a view similar to FIG. 16 according to a sixth embodiment of the present invention.

FIG. 23 is an enlarged perspective view of the reinforcing member of FIG. 22.

FIG. 24 is a side view schematically showing an injection mold or an injection press mold.

FIG. 25 is a view similar to FIG. 22 according to a modification of the sixth embodiment.

[Explanation of symbols]

 2 lid part 3 skin 18 skin layer scattering prevention sheet 19 single layer body 20 air release 36 multilayer body 37 elastic thin plate 38 composite body 45 joining part 50 reinforcing material

Claims (13)

[Claims] In a lid structure of an airbag device for a vehicle having at least a skin and a core material manufactured by powder slash on a lid portion, a sheet for preventing skin layer scattering is fixed to the back side of the skin. A lid portion structure of a vehicle airbag device, characterized in that: 2. The lid for an airbag device for a vehicle according to claim 1, wherein the sheet for preventing the skin layer from scattering is a single layer of a woven fabric, a nonwoven fabric, or a thermoplastic elastomer sheet material. Part structure. 3. A multi-layered body obtained by laminating at least two of a woven fabric, a non-woven fabric, and a thermoplastic elastomer sheet material constituting the single-layered body is used as the skin layer scattering prevention sheet. The lid portion structure of a vehicle airbag device according to claim 1, wherein 4. A composite in which the above-mentioned single-layered or multi-layered body is inserted into a foamed elastic reinforcing sheet for reinforcing the skin and increasing elasticity, as the sheet for preventing skin layer scattering. The lid part structure of a vehicle airbag device according to claim 1, wherein: 5. The lid structure of a vehicle airbag device according to claim 1, wherein an air vent is formed in the skin layer scattering prevention sheet. 6. The cut-off sheet serving as a cleavage groove is formed in advance on the skin layer scattering prevention sheet.
A lid portion structure of the vehicle airbag device according to any one of claims 5 to 10. 7. A lid portion structure for a vehicle airbag device according to claim 6, wherein a connecting portion is appropriately formed in the middle of said cut. 8. The sheet for preventing scattering of the skin layer may have a temperature of -40.degree.
Tensile strength at 250 × 9.8 N / cm ² (250 kg
f / cm ² ) to 500 × 9.8 N / cm ² (500 kgf)
/ Cm ² ), the elongation is 50% or more, the tear strength is 10 × 9.8 N / cm ² (10 Kgf / cm ² ) or more,
The tensile strength at 23 ° C. is 50 × 9.8 N / cm ² (50K
gf / cm ² ) to 100 × 9.8 N / cm ² (100 kg)
f / cm ² ), the elongation is 100% or more, the tear strength is 10 × 9.8 N / cm ² (10 Kgf / cm ² ) or more, and the tensile strength at 85 ° C. is 10 × 9. 8N / cm ² (1
0 Kgf / cm ² ) to 100 × 9.8 N / cm ² (100
Kgf / cm ² ) and the elongation percentage is 150 to 500 (%)
And a tear strength of 5 × 9.8 N / cm ² (5 kgf / c
m ²⁾ characterized by using the above materials according to claim 1
8. The lid structure of the vehicle airbag device according to any one of items 7. 9. A preheated sheet for preventing the skin layer from being scattered is fixed to a portion corresponding to the back surface side of the skin layer of the plastisol layer forming the skin.
A lid part structure of the vehicle airbag device according to any one of claims 8 to 8. 10. The skin layer scattering preventing sheet is made of a woven or non-woven fabric, and the temperature for preheating the sheet is 6.
The lid part structure of a vehicle airbag device according to claim 9, wherein the temperature is 0C to 260C. 11. The vehicle air according to claim 9, wherein the skin layer scattering prevention sheet is made of a thermoplastic elastomer sheet material, and a temperature for preheating the sheet is 60 ° C. to 230 ° C. Lid structure of bag device. 12. The thermoplastic elastomer sheet material,
The lid structure of a vehicle airbag device according to any one of claims 2, 3, and 9, wherein the lid portion is any one of a PVC system, a TPU system, and a TEO system. 13. A vehicle airbag device comprising: a lid portion structure of a vehicle airbag device having at least a skin and a core material in a lid portion, wherein a reinforcing material is fixed to a back side of the core material. Lid structure.