JPH1086703A - Instrument panel skin provided integrally with air bag door part and manufacture of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an instrument panel skin keeping the sufficient rigidity without generating cracks or the like caused by the degradation in the tear part and the appearance of the tear part on a design surface. SOLUTION: An instrument panel 10 has the laminated structure consisting of a PVC(polyvinyl chloride resin) signal layer skin 20, PUR(polyurethane) foamed layer 22 and resin made base material 24. An air back door part 10A of the instrument panel 10 is formed with a H-shaped tear part 32 to be torn open. Short fibers 34 of polyester, nylon or the like are planted along the tear part 32 on the rear surface 20A of the skin 20. Also, an air bag door part 28 of the base material 24 is formed along the tear part 32 with a tearing-open part 28A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrument panel skin having an airbag door unit and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, an example of an instrument panel skin having an integral door portion of an airbag device for a passenger seat has been disclosed.
JP-A-5-246272, JP-A-6-19920
No. 1 discloses this.

[0003] As shown in FIG.
In the instrument panel described in Japanese Patent Publication No. 72, an airbag bag is formed by forming a tear portion 114 for deploying an airbag door portion on a back surface 112A of a skin 112 of the instrument panel 110 using a high-frequency hot blade. The tearing of the instrument panel 110 during body deployment is ensured, and the appearance of the design surface 112B of the skin 112 is not impaired.

Further, as shown in FIG.
In the instrument panel described in Japanese Patent Application Laid-Open No. 99201, the outer skin 122 of the instrument panel 120 has a two-layer structure made of a different material in order to surely tear the instrument panel when the airbag bag is deployed. The tier portion 122A formed for deployment is made of a material that is easier to tear than the other portion 122B.

[0005]

However, in these instrument panels, both tear easily from the tier portion. However, in any of the instrument panels, the rigidity of the tier portion of the epidermis is poor. It is easy to dent when pressed by hand. In addition, Japanese Patent Application Laid-Open No.
Instrument panel 1 described in No. 72
10, since the thickness of the tier portion 114 is small, the skin 112 in the tier portion 114 deteriorates quickly,
There is a possibility that cracks and the like due to deterioration may occur in No. 4. Further, in the instrument panel 120 described in JP-A-6-199201, since different materials are used,
Since the tier portion 122A appears on the design surface, it is necessary to secure the appearance by painting or the like.

In view of the above facts, the present invention does not cause cracks or the like due to deterioration in the tier while maintaining sufficient rigidity.
It is another object of the present invention to provide an instrument panel skin having an airbag door portion in which a tier does not appear on a design surface, and a method of manufacturing the same.

[0007]

According to a first aspect of the present invention, there is provided an instrument panel skin having an airbag door portion integrally formed with a tear tier on an airbag door portion of the instrument panel skin. In addition, short fibers are implanted on the back surface of the epidermis along the tier.

Accordingly, short fibers are planted along the tier on the back surface of the skin, and a large number of short fibers are pierced adjacently, so that the tear strength of the tier of the skin is significantly reduced, and a large extension pressing force is obtained. When the airbag body is acted on by the airbag, the tear portion is reliably torn. In addition, since the cross-sectional area of the short fibers is extremely small, and no thin portion is formed in the tier, there is a possibility that cracks due to deterioration may occur in the tier while maintaining sufficient rigidity as the whole skin. And the tier does not appear on the design surface.

According to a second aspect of the present invention, there is provided a method of manufacturing an instrument panel skin having an airbag door portion in which a tear tier is formed in an airbag door portion of the instrument panel skin, The method is characterized by comprising a step of forming the skin by a powder slush molding method, and piercing short fibers along the tier portion on the back surface of the heated skin using the electrostatic flocking method.

Therefore, the short fibers can be easily implanted in the tier portion on the back surface of the epidermis and can be easily manufactured.

According to a third aspect of the present invention, there is provided an instrument panel skin integrally including an airbag door portion having a tear tier formed on an airbag door portion of the instrument panel skin, wherein And a primer applied along the tier portion.

Therefore, a primer is applied to the back surface of the skin,
Since the elongation characteristic of the tier portion of the skin changes locally, there is a difference in the stress distribution on the back surface of the skin. Therefore, stress at the time of deployment of the airbag body concentrates on the boundary between the tier portion where the primer has been applied and the uncoated portion. For this reason, it is possible to cleave the skin at the intended tier portion when the airbag bag is deployed. In addition, since only a primer is applied to the tier portion on the back surface of the skin and no thin-walled portion is formed on the tier portion, cracks and the like due to deterioration occur in the tier portion while maintaining sufficient rigidity as the entire skin. There is almost no possibility, and the tier does not appear on the design surface.

According to a fourth aspect of the present invention, there is provided a method of manufacturing an instrument panel skin having an airbag door portion integrally formed with a tearing tier in an airbag door portion of the instrument panel skin, It is characterized by having an application step of applying a primer along a tier on the back surface of the skin.

Therefore, the conventional method can be used, and there is no need to change the skin. Further, an additional coating step is easy.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an instrument panel skin having an airbag door unit according to the present invention will be described with reference to FIGS.

As shown in FIG. 2, an instrument panel 10 provided in the cabin of the vehicle includes an airbag device 12 (FIG. 1) inwardly on the passenger seat side (right side in FIG. 2).
Is partially shown). The portion of the instrument panel 10 facing the airbag device 12 is an airbag door portion 10A, and the other portion is a general portion 10B.

As shown in FIG. 1, an airbag case 14 of the airbag device 12 is fixed to an instrument panel reinforcement (not shown). The airbag case 14 has an inflator 16 and a folded state. , The air bag body 18 is stored.

The instrument panel 10 is made of PVC.
It has a structure in which a single layer skin (vinyl chloride resin) 20, a PUR (polyurethane) foam layer 22, and a resin base material 24 are laminated. A portion of the base material 24 substantially opposed to the airbag case 14 is an airbag door portion 28, and a portion of the base material 24 other than the airbag door portion 28 is a general portion 30.
It has become. In addition, the airbag door portion 28 of the base material 24
And the general part 30 are integrally formed.

As shown in FIG. 2, an H-shaped tear portion 32 for tearing is formed in the airbag door portion 10A of the instrument panel 10.

As shown in FIG. 1, the back surface 20 of the
On the A side, short fibers 34 such as polyester and nylon are implanted along the tier portion 32. In addition, the airbag door portion 28 of the base material 24 is cut along the tear portion 32 along the tear portion 2.
8A are formed.

When the airbag device 12 detects a sudden deceleration of the vehicle by a mechanical or electric acceleration sensor (not shown), the inflator 16 in the airbag case 14 operates and the airbag device 14 The folded and stored airbag bag body 18 is inflated toward the airbag door portion 10A of the instrument panel 10. The airbag body 18 presses the airbag door portion 10A of the instrument panel 10 to cleave the instrument panel 10 and deploy the instrument panel 10 in the vehicle interior. In addition, since a conventionally known general configuration can be applied to the airbag device 12, detailed description of the airbag device 12 is omitted in the present embodiment.

Next, a method of manufacturing the instrument panel skin according to the first embodiment of the present invention will be described in detail.

As shown in FIG. 4A, the first embodiment of the present invention
In the manufacturing method of the embodiment, the PV
C powder material 42 is put into the box 44.

Next, as shown in FIG. 4B, a skin 20 is formed by slush molding. Next, as shown in FIG. 4C, when the epidermis 20 is in a melted state at about 200 ° C. to 150 ° C., the flocking device 46 containing the short fibers 34 such as polyester and nylon is placed in the electroforming mold 40. Insert This flocking device 46 includes an H-shaped flocking portion 46A corresponding to the tier portion, and as shown in FIG.
It can be fixed at a position corresponding to the tier in the electroforming mold 40.

As shown in FIG. 4D, an electrode 48 is embedded in the electroforming mold 40 so as to correspond to the tier portion.
On the other hand, the electrode 50 is also provided above the flocking portion 46A of the flocking device 46.
Are arranged, and these electrodes 48 and 50 are connected to a static electricity applying device 52. Accordingly, by applying a voltage to the electrodes 48 and 50 by the static electricity applying device 52 to charge the short fibers 34 and attracting the charged short fibers 34 by the electrodes 48 embedded in the electroforming mold 40, the short fibers are shorted to the epidermis 20. The fibers 34 are pierced (electrostatic flocking).

At this time, the length, the shaft diameter, the piercing depth, and the width of the short fibers 34 are determined by the rigidity of the epidermis 20 and the epidermis 2
0 is set in consideration of the ease of cleavage.

Next, the operation of the first embodiment of the present invention will be described. In the instrument panel 10 according to the first embodiment of the present invention, short fibers 34 are implanted along the tier portion 32 on the back surface 20A of the skin 20 and a large number of short fibers 34 are pierced adjacently. As shown in FIG. 3, when the tear strength of the tear portion 32 is significantly reduced, and the airbag body is deployed with a large extension pressing force, as shown in FIG.
The skin 20 is reliably torn at the tier portion 32.

Further, since the cross-sectional area of the short fiber 34 is extremely small and no thin portion is formed at the tier portion of the skin 20, the tier portion 32 is deteriorated as a whole while maintaining sufficient rigidity. There is almost no possibility that cracks or the like will occur due to cracks, and the tear portion 32 will not appear on the design surface.

In the method for manufacturing the instrument panel skin according to the first embodiment of the present invention, the skin 20 is formed by a powder slush molding method, and the back surface of the heated skin 20 is shorted along the tear portion 32 along the tier portion 32. In order to pierce the fiber 34 using the electrostatic flocking method, the short fiber 34 is
Hair can be easily implanted in the 0A tier.

In the first embodiment of the present invention, the instrument panel 10 is made of a PVC single-layer skin 20, PU,
Although the structure in which the R foam layer 22 and the resin base material 24 are laminated is adopted, the structure of the instrument panel 10 is not limited to this, and may be another structure such as a single-layer structure. Further, the material of the skin is not limited to PVC.

In the method of manufacturing the instrument panel skin according to the first embodiment of the present invention, the skin 20 is formed by a powder slush molding method, and the short fibers 34 are formed on the back surface 20A of the skin 20 along the tear portion 32. Although the piercing was performed using the electrostatic flocking method, the method of manufacturing the instrument panel skin is not limited to the powder slash molding method, and instead of the electrostatic flocking method, the tear portion is mechanically attached to the back surface 20A of the skin 20. A short fiber 34 may be implanted along 32.

Further, in the method of manufacturing the instrument panel skin according to the first embodiment of the present invention, the flocking device 46 having the H-shaped flocking portion 46A corresponding to the tier portion 32 is used. A flocking device having a flocked portion may be used, and the flocking device may be moved to the back surface 20 </ b> A of the epidermis 20 along the tier portion 32 to perform the flocking.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 5, in the instrument panel 10 according to the second embodiment of the present invention, a primer 60 is applied to the back surface 20A of the skin 20 at a predetermined width along the tear portion 32. The characteristics of the primer 60 are not limited to a solvent type or an emulsion type, but it is preferable to select a primer having a higher modulus than the skin 20 after coating and drying. Further, the application width and the modulus value of the primer 60 are determined according to the characteristics of the skin 20, the width of the tier portion 32,
It is appropriately selected in consideration of the load to be applied.

Next, a method for manufacturing an instrument panel skin according to a second embodiment of the present invention will be described.

In the second embodiment of the present invention, as in the first embodiment, after the skin 20 is formed by slash molding in a heated electroforming mold 40, the back surface 20A of the skin 20 is formed by a coating apparatus having a coating nozzle. An application step of applying the primer 60 along the tier portion of FIG.

Next, the operation of the second embodiment of the present invention will be described. In the instrument panel 10 according to the second embodiment of the present invention, the primer 60 is applied to the back surface 20A of the skin 20 and the elongation characteristic of the tier portion of the skin 20 locally changes. There is a difference in stress distribution. Therefore, the tier to which the primer 60 has been applied,
The stress at the time of deploying the airbag bag concentrates on the boundary portion 64 of the uncoated portion. For this reason, as shown in FIG. 6, the outer skin 20 is reliably torn at the intended tier portion 32 when the airbag bag is deployed. Cleavage can be ensured.

In the instrument panel 10 according to the second embodiment of the present invention, since the primer 60 is applied only to the back surface 20A of the skin 20 and the thin portion or the like is not formed in the tear portion 32, the entire skin 20 is not formed. However, while maintaining sufficient rigidity, there is almost no possibility that a crack or the like is generated in the tear portion 32 due to deterioration, and the tear portion 32 does not appear on the design surface.

Further, in the method of manufacturing the instrument panel skin according to the second embodiment of the present invention, the primer 6 is formed along the tier portion 32 of the back surface 20A of the skin 20 by a conventional manufacturing method.
Since only the application step of applying 0 is added, the conventional method can be used, and there is no need to change the conventional skin. Further, an additional coating step is easy. Therefore, cost increase can be suppressed to a minimum.

In the second embodiment of the present invention, the instrument panel 10 is made of a PVC single-layer skin 20, PU,
Although the structure in which the R foam layer 22 and the resin base material 24 are laminated is adopted, the structure of the instrument panel 10 is not limited to this, and may be another structure such as a single-layer structure. Further, the material of the skin is not limited to PVC, and for example, a thermoplastic elastomer (TPO (thermoplastic olefin),
TPU).

In the method of manufacturing the instrument panel skin according to the second embodiment of the present invention, the skin 20 is formed by a powder slush molding method, and a primer 60 is applied to the back surface of the skin 20 along the tear portion 32 by a nozzle. However, the method of manufacturing the instrument panel skin is not limited to the powder slush molding method, and the method of applying the primer 60 is not limited to the application method using an application device having an application nozzle.

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 within the scope of the present invention. It is clear to a person skilled in the art that is possible. For example, as a method for manufacturing an instrument panel using the skin of the present invention, a urethane injection foaming method, a skin insert molding method, or the like can be applied.

[0043]

According to the first aspect of the present invention, there is provided an instrument panel skin integrally including an airbag door portion having a tear tier formed in an airbag door portion of the instrument panel skin. Since short fibers are implanted along the tier on the back side, excellent effect that cracks etc. due to deterioration do not occur in the tier while maintaining sufficient rigidity and the tier does not appear on the design surface Having.

According to a second aspect of the present invention, there is provided a method of manufacturing an instrument panel skin having an airbag door portion integrally formed with a tear tier portion at an airbag door portion of the instrument panel skin, Forming the skin by the powder slush molding method, and having a process of piercing short fibers along the tier using the electrostatic flocking method on the back surface of the heated skin, so that the tier is maintained with sufficient rigidity. This has an excellent effect that an instrument panel skin in which cracks and the like due to deterioration do not occur and a tier portion does not appear on a design surface can be easily manufactured.

According to a third aspect of the present invention, there is provided an instrument panel skin integrally including an airbag door portion having a tear tier formed on an airbag door portion of the instrument panel skin, wherein Since the primer is applied along the tier, there is an excellent effect that cracks or the like due to deterioration do not occur in the tier while maintaining sufficient rigidity, and the tier does not appear on the design surface.

According to a fourth aspect of the present invention, there is provided a method of manufacturing an instrument panel skin having an airbag door portion having a tear tier formed on an airbag door portion of the instrument panel skin. Since there is an application step of applying the primer along the tier on the back surface of the skin, the instrument panel does not generate cracks or the like due to deterioration in the tier while maintaining sufficient rigidity, and the tier does not appear on the design surface It has an excellent effect that the epidermis can be easily produced. In addition, there is no need to change the conventional method and the skin, and there is an excellent effect that cost increase can be minimized.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line 1-1 of FIG. 2;

FIG. 2 is a perspective view showing an instrument panel to which an instrument panel skin integrally including an airbag door unit according to the first embodiment of the present invention is applied.

FIG. 3 is an operation explanatory view showing an instrument panel skin integrally having an airbag door portion according to the first embodiment of the present invention.

FIGS. 4A to 4D are schematic cross-sectional views illustrating a method for manufacturing an instrument panel skin integrally including an airbag door according to the first embodiment of the present invention.

FIG. 5 is a view showing an instrument panel skin integrally including an airbag door according to a second embodiment of the present invention.
It is sectional drawing corresponding to FIG.

FIG. 6 is an operation explanatory view showing an instrument panel skin integrally including an airbag door portion according to a second embodiment of the present invention.

FIG. 7 is a side sectional view showing a part of an instrument panel to which an instrument panel skin integrally including an airbag door portion according to a conventional embodiment is applied.

FIG. 8 is a perspective view showing an instrument panel to which an instrument panel skin integrally including an airbag door unit according to another conventional embodiment is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Instrument panel 10A Airbag door part of an instrument panel 10B General part of an instrument panel 12 Airbag device 20 Skin 32 Tear part 34 Short fiber 40 Electric mold 46 Flocking device 48 Electrode 50 Electrode 52 Electrostatic device 60 Primer

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Osamu Kito 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation

Claims (4)

[Claims] 1. An instrument panel skin having an airbag door portion integrally formed with a tear tier portion formed on an airbag door portion of the instrument panel skin, and a short side along the tier portion on a back surface of the skin. An instrument panel skin integrally having an airbag door portion, wherein fibers are planted. 2. A method for manufacturing an instrument panel skin having an airbag door portion in which a tear tier is formed on an airbag door portion of the instrument panel skin, wherein the skin is formed by a powder slush molding method. Manufacturing an instrument panel skin integrally having an airbag door portion, characterized by having a process of piercing short fibers along the tier portion on the back surface of the heated skin using the electrostatic flocking method. Method. 3. An instrument panel skin having an airbag door portion in which a tear tier is formed on an airbag door portion of the instrument panel skin, wherein a primer is provided on the back surface of the instrument panel along the tier portion. An instrument panel skin having an airbag door unit integrally, characterized by being coated with an airbag. 4. A method of manufacturing an instrument panel skin having an airbag door portion in which a tear tier is formed in an airbag door portion of an instrument panel skin, the method comprising: A method of manufacturing an instrument panel skin integrally including an airbag door portion, comprising a coating step of applying a primer by heating.