JP2022086212A - instrument panel - Google Patents

Abstract

To make skin having a fabric layer on a surface layer section easily break in a portion corresponding to a tear line of a base material.SOLUTION: An instrument panel body 12 of an instrument panel 11 has a base material 13 and a skin 21. An airbag device 30 has an airbag 45 deployed and inflated by an inflation gas and is arranged on a rear side of the instrument panel body 12. The skin 21 has a fabric layer 23 formed by a woven or a knitted fabric on a surface layer section. The instrument panel body 12 has an airbag door 24 in a portion to be in front of a deploying direction of the airbag 45. In the base material 13 in the airbag door 24, a tear line 14 is provided to be an original point of breaking when pressed by the airbag 45. In a region including at least a part projected by a tear line 14 or a portion adjacent to the tear line 14 of a rear face of the fabric layer 23, a medicine application section to which medicine for weakening constituent yarns constituting the fabric layer 23 is applied is formed.SELECTED DRAWING: Figure 2

Description

The present invention relates to an instrument panel in which a skeleton portion is composed of an instrument panel main body and an airbag device is arranged on the back side of the instrument panel main body.

An instrument panel is placed in front of the front seats in the passenger compartment. As this instrument panel, one provided with an instrument panel main body and an airbag device is known. The instrument panel main body is a part constituting the skeleton portion of the instrument panel, and includes a base material extending in the vehicle width direction in the vehicle interior and a skin laminated on the front side of the base material. The airbag device is arranged on the back side of the instrument panel main body.

Synthetic leather is often used as the epidermis. Synthetic leather has, for example, a resin layer formed of a resin material such as an olefin-based thermoplastic elastomer (TPO) on the surface layer portion. This skin is fixed to the surface of the base material with an adhesive.

The instrument panel main body is provided with an airbag door at a position in front of the airbag device in the deployment direction of the airbag. The base material of the airbag door is provided with a tear line that is a starting point of fracture when pressed by the airbag.

Then, when an impact is applied to the vehicle from the front, the airbag in the airbag device starts to expand and expand due to the expansion gas. In the process of this deployment and expansion, the pressing force of the airbag is applied to the airbag door, and the airbag door is broken. At that time, the tear line becomes the starting point of fracture, and the base material is fractured along the tear line. In addition, as the base material breaks, the epidermis made of synthetic leather also breaks. The airbag continues to deploy and expand between the instrument panel body and the occupant in the front seat through the opening created by the rupture of the airbag door, and cushions the impact on the occupant.

Here, it is required to break the epidermis of the airbag door along the tear line of the base material when the airbag is deployed and expanded. Therefore, for example, in Patent Document 1, among the portions related to the adhesion between the front surface surface of the base material and the epidermis in the airbag door, the strip-shaped region including the portion where the tear line is projected and extending along the tear line is defined as the first. One area. The band-shaped region along the tear line on both sides in the width direction of the first region is defined as the second region. The adhesive force of the epidermis to the substrate is made lower in the first region than at least in each second region.

Therefore, the pressing force of the airbag concentrates on the first region, which has a lower adhesive force than the second region. As a result, the epidermis is liable to be broken along the tear line at the portion corresponding to the tear line of the base material in the first region.

Japanese Unexamined Patent Publication No. 2012-176663

By the way, in recent years, in order to give a sense of unity to the interior parts of a vehicle, a case where a fabric layer formed of a woven fabric or a knitted fabric is used as the surface layer of the instrument panel body instead of the synthetic leather is adopted. There is. For example, when the skin of the occupant's seat is made of woven or knitted fabric. In this case, in order to give a sense of unity with the skin of the seat, a material having a fabric layer on the surface layer as described above may be used as the skin of the instrument panel main body.

However, the epidermis having the fabric layer in the surface layer portion has higher strength than the epidermis made of synthetic leather. Therefore, when the airbag is deployed and expanded, it is difficult to break the epidermis at a portion corresponding to the tear line of the base material.

It is conceivable to apply the technique described in Patent Document 1 to the instrument panel main body having the fabric layer on the surface layer portion of the epidermis. However, Patent Document 1 covers an instrument panel body in which the epidermis is broken by the pressing force of an airbag, such as synthetic leather. Therefore, as described above, it is still difficult to break a skin having a fabric layer having a higher strength than synthetic leather on the surface layer at a portion corresponding to the tear line of the base material.

The above problem is not limited to the instrument panel for vehicles, but the instrument panel for other vehicles as long as the skin has a fabric layer on the surface layer and the tear line is formed on the base material. But it can happen as well.

The instrument panel that solves the above-mentioned problems is an airbag having an airbag in which a skeleton portion is composed of an instrument panel main body including a base material and a skin laminated on the front side of the base material, and is expanded and expanded by an expansion gas. The device is an instrument panel arranged on the back side of the instrument panel main body, the skin has a fabric layer formed of a woven fabric or a knitted fabric on the surface layer portion, and the instrument panel main body is forward in the deployment direction of the airbag. An airbag door is provided at a location where the airbag door is provided, and the base material in the airbag door is provided with a tear line that becomes a starting point of breakage when pressed by the airbag. Alternatively, a drug application portion formed by applying a drug that weakens the constituent threads constituting the fabric layer is formed in a region including at least a portion where a portion adjacent to the tear line is projected.

According to the above configuration, when the airbag in the airbag device is expanded and expanded by the expansion gas, the pressing force of the airbag is applied to the airbag door in the process of the expansion and expansion, and the airbag door is broken. The door. At that time, the tear line becomes the starting point of fracture, and the base material is fractured along the tear line.

Here, in the portion of the fabric layer where the chemical application portion is formed, the constituent yarns of the fabric layer are weakened by the applied chemical. Therefore, in the fabric layer, the strength of the portion where the chemical coating portion is formed on the back surface is lower than the strength of the portion where the chemical coating portion is not formed. Therefore, when the pressing force of the expanding and expanding airbag is applied to the epidermis, the fabric layer is more likely to be broken at the portion where the drug coating portion is formed than at the portion where the drug application portion is not formed on the back surface.

The chemical application portion is formed in a region of the back surface of the fabric layer including at least a portion where the tear line or a portion adjacent to the tear line is projected. Therefore, as described above, when the base material is broken along the tear line, the epidermis including the fabric layer is likely to be broken along the tear line or the region adjacent to the tear line.

The airbag then continues to deploy and expand between the instrument panel body and the occupant through the opening created by the rupture of the airbag door, mitigating the impact on the occupant.
In the instrument panel, the drug is preferably made of an alkaline substance.

According to the above configuration, the alkaline substance can corrode and weaken the constituent yarns of the fabric layer.
In the instrument panel, it is preferable that the chemical coating portion has a band shape and the width of the chemical coating portion is set wider than the width of the tear line.

By setting the width of the chemical coating portion so as to satisfy the above conditions, the constituent yarns in the region corresponding to the tear line or the portion adjacent to the tear line in the fabric layer in the airbag door are weakened, and the fabric layer is weakened. Is easy to break along the tear line.

In the instrument panel, it is preferable that a plurality of the drug-applied portions are provided, each drug-applied portion has a band shape, and the plurality of the drug-applied portions extend in a state of being parallel to each other and extending.

According to the above configuration, in the band-shaped portion where each chemical coating portion is formed in the fabric layer, the constituent yarns of the fabric layer are weakened, and the strength of the portion is reduced.
In the fabric layer, the strip-shaped weakened portions as described above are formed in a state of being separated from each other in parallel. Therefore, among the fabric layers in the airbag door, it is possible to reduce the strength of a plurality of chemical coating portions in the arrangement direction and make it easier for the fabric layer to break in the same arrangement direction.

In the instrument panel, it is preferable that the plurality of drug-applied portions are formed at equal intervals.
As described above, by forming a plurality of strip-shaped chemical application portions at equal intervals, the back surface of the fabric layer is adjacent to the tear line or the tear line as compared with the case where the chemical application portions are formed at non-equal intervals. It is possible to evenly weaken the constituent yarns in the area including at least the projected portion of the area to be used.

In the instrument panel, the drug coating portions are strip-shaped and extend in a state of being parallel to each other, and a plurality of first drug coating portions are formed in a band shape and extend in a state of being separated from each other in parallel. It is preferable that the second drug coating section is provided and each second drug coating section intersects with each first drug coating section.

According to the above configuration, the fabric layer is compared with the case where the chemical coating portion is composed of only a plurality of first chemical coating portions and as compared with the case where the chemical coating portion is composed of only a plurality of second chemical coating portions. In, the ratio of the drug-applied portion to the unit area becomes high. Therefore, it is possible to efficiently weaken the constituent yarns of the portion to be weakened among the constituent yarns of the fabric layer.

According to the instrument panel, the epidermis having the fabric layer on the surface layer portion can be easily broken at the portion corresponding to the tear line of the base material.

It is a figure which shows one embodiment embodied in the instrument panel for a vehicle, and is the perspective view which shows the instrument panel and its peripheral part. A partial cross-sectional view showing an instrument panel main body and an airbag device in an instrument panel of one embodiment. FIG. 2 is a partial cross-sectional view showing an enlarged portion X of FIG. A partial plan view showing an airbag door and its peripheral parts in the instrument panel main body in one embodiment. It is a figure which shows one Embodiment, and is a partial plan view which shows the positional relationship between the agent coating part of a fabric layer, and the tear line of a base material. The partial plan view which shows the deformation example of the chemical | chemical application part in a fabric layer. Similarly, a partial plan view showing a modified example of the chemical application portion in the fabric layer. Partial plan view of the instrument panel body having the tear line of the modified example.

Hereinafter, an embodiment of the present invention embodied in an instrument panel for a vehicle will be described with reference to FIGS. 1 to 5.
In the following description, the forward direction of the vehicle is described as forward, and the front, rear, up, down, left, and right are defined based on the forward direction. The left-right direction matches the vehicle width direction.

In the passenger compartment, the driver's seat and the passenger's seat, which are not shown, are arranged side by side in the left-right direction. In this embodiment, the skins of all seats in which the occupants are seated, including the driver's seat and the passenger's seat, are made of woven fabric or knitted fabric. In front of the driver's seat and the passenger seat in the passenger seat, an instrument panel extending in the left-right direction is arranged.

As shown in FIGS. 1 and 2, the instrument panel 11 includes an instrument panel main body 12 and an airbag device 30 for a passenger seat. The airbag device 30 includes an airbag 45 that is expanded and expanded by an expansion gas.

Next, each part constituting the instrument panel 11 will be described.
<About the instrument panel body 12>
The instrument panel main body 12 is a portion constituting the skeleton portion of the instrument panel 11. As shown in FIG. 2, the instrument panel main body 12 includes a base material 13 extending in the left-right direction in the vehicle interior and a skin 21 laminated on the front side (upper side) of the base material 13.

The base material 13 is made of a resin material such as TPO and polypropylene (PP).
The skin 21 includes a cushion layer 22 laminated on the base material 13, and a fabric layer 23 laminated on the cushion layer 22.

The cushion layer 22 is used to improve the tactile sensation of the instrument panel main body 12, and imparts the cushioning property (elasticity) required for the instrument panel main body 12. The cushion layer 22 is adhered to the base material 13. The cushion layer 22 is formed of a foam material such as PP, polyurethane, or polyethylene (PE).

The fabric layer 23 is provided for the purpose of improving the texture, tactile sensation, appearance, etc. of the instrument panel main body 12 and also providing a sense of unity with the interior parts of the vehicle 10, for example, the driver's seat, the passenger's seat, and the like. There is. The fabric layer 23 is formed by processing a material similar to the skin of the driver's seat, passenger's seat, or the like, that is, a fabric made of a woven fabric or a knitted fabric. In the case of knitting, the fabric layer 23 may be formed by either weft knitting or warp knitting. The fabric layer 23 is adhered to the cushion layer 22.

Examples of the constituent yarns constituting the fabric layer 23 include yarns formed of synthetic fiber multifilaments such as polyamide-based, polyester-based, and acrylic-based yarns having a single yarn fineness of 0.1 to 10 decitex and a total fineness of 20 to 500 decitex. Used.

The fabric layer 23 constitutes the surface layer portion of the skin 21. The upper surface of the fabric layer 23 constitutes the design surface of the instrument panel 11.
As shown in FIGS. 2 and 3, the instrument panel main body 12 is located in front of the airbag 45 in the deployment direction (above each of FIGS. 2 and 3) and is adjacent to the cylindrical wall portion 32 described later. An airbag door 24 is provided at the location. The airbag door 24 has a layered structure similar to that of other parts of the instrument panel main body 12. That is, the airbag door 24 includes a base material 13, a cushion layer 22, and a fabric layer 23. The airbag door 24 is provided with a tear line 14 as a planned break line for inducing a break for opening the airbag door 24. The tear line 14 will be described later.

At least in front of the passenger seat, the epidermis 21 includes a front epidermis 21f and a posterior epidermis 21r arranged behind the anterior epidermis 21f. The cushion layer 22 in the front skin 21f is referred to as a front cushion layer 22f, and the fabric layer 23 is referred to as a front fabric layer 23f. The cushion layer 22 in the rear skin 21r is referred to as a rear cushion layer 22r, and the fabric layer 23 is referred to as a rear fabric layer 23r. The front fabric layer 23f and the rear fabric layer 23r are pushed between the front cushion layer 22f and the rear cushion layer 22r. The pushed portion of the front fabric layer 23f and the rear fabric layer 23r is fixed to the front cushion layer 22f and the rear cushion layer 22r by adhesion. In this way, the front fabric layer 23f and the rear fabric layer 23r are coupled to each other between the front cushion layer 22f and the rear cushion layer 22r. Further, the locking (fixing) structure of the front fabric layer 23f and the rear fabric layer 23r with respect to the front cushion layer 22f and the rear cushion layer 22r is also referred to as wood grain inclusion.

The front fabric layer 23f and the rear fabric layer 23r may be joined by sewing instead of the above-mentioned wood grain.
When the front fabric layer 23f and the rear fabric layer 23r are joined by any of the above-mentioned wood graining and sewing methods, the strength of the bonded portion is the strength of the front fabric layer 23f and the rear fabric layer 23r at other points. Lower than.

<About the airbag device 30>
As shown in FIG. 2, the airbag device 30 is arranged on the back side (lower side) of the airbag door 24. The airbag device 30 includes a retainer 31 and an inflator 46 in addition to the airbag 45.

The retainer 31 includes a cylindrical wall portion 32, a front door portion 37, and a rear door portion 41, and is made of a resin material such as TPO.
The tubular wall portion 32 has a rectangular tubular shape extending substantially in the vertical direction. The tubular wall portion 32 includes a front wall portion 33 and a rear wall portion 34 facing each other in the front-rear direction, and a pair of side wall portions 35 facing each other in the left-right direction (only one is shown in FIG. 2). Both ends of the cylindrical wall portion 32 are open. The distance between the side wall portions 35 is set to be larger than the distance between the front wall portion 33 and the rear wall portion 34.

As shown in FIGS. 2 and 3, after the open portions at both ends of the tubular wall portion 32, the open portion on the front side (upper side) on the airbag door 24 side passes through the process of deploying and expanding the airbag 45. It constitutes an opening (hereinafter referred to as "airbag opening 36").

Each of the front door portion 37 and the rear door portion 41 has a rectangular plate shape that is elongated in the left-right direction rather than in the front-rear direction. The front door portion 37 and the rear door portion 41 are arranged in the airbag opening 36 in a state of being arranged in the front-rear direction. The front door portion 37 and the rear door portion 41 are separated in the front-rear direction with a gap G1 extending in the left-right direction between them.

As shown in FIG. 2, the front end portion of the front door portion 37 is connected to the upper end portion of the front wall portion 33 via the front hinge portion 38. The rear end portion of the rear door portion 41 is connected to the upper end portion of the rear wall portion 34 via the rear hinge portion 42.

The retainer 31 is fixed to the base material 13 of the airbag door 24 by a vibration welding method at the front door portion 37, the rear door portion 41, and the like. However, the retainer 31 may be bonded to the base material 13 by another method, for example, adhesion using an adhesive such as hot melt.

The front door portion 37 and the rear door portion 41 may be separably connected by a connecting portion provided in the gap G1 between them. In this case, a tear line may be formed at the connecting portion.

Further, the left and right side edges of the front door portion 37 and the rear door portion 41 may be separated from the upper end portion of the side wall portion 35 located below them, or may be separated from the upper end portion of the side wall portion 35 via the connecting portion. They may be separably linked.

The airbag 45 is housed in the tubular wall portion 32 in a compact state by being folded. The airbag 45 is formed of a woven fabric formed by using a material having high strength, flexibility, and easily folding, for example, polyester yarn, polyamide yarn, or the like. The airbag 45 has a size that can be deployed and expanded between the instrument panel main body 12 and the passenger in the passenger seat.

The inflator 46 is arranged in the airbag 45. A gas generator (not shown) is housed inside the inflator 46, and an expansion gas is generated by the reaction of the gas generator. As the inflator 46, instead of the type using the gas generating agent, a type in which the partition wall of the high-pressure gas cylinder filled with the high-pressure gas is broken by an explosive or the like to eject the expansion gas may be used.

<About Tearline 14>
The tear line 14 serves as a starting point of breakage when the airbag door 24 is broken. The tear line 14 is provided on a member on the back side (lower side) of the constituent members of the airbag door 24 with respect to the fabric layer 23 in order to make it difficult to see the tear line 14 from the front side (upper side) of the airbag door 24. There is. In this embodiment, the tear line 14 is provided only on the base material 13.

As shown in FIGS. 1 and 4, the tear line 14 includes one horizontal line portion 15 extending in the left-right direction and two vertical line portions 16 and 17. The horizontal line portion 15 is located above the gap G1 between the front door portion 37 and the rear door portion 41 and below the joint portion between the front fabric layer 23f and the rear fabric layer 23r. (See Fig. 3). The left vertical line portion 16 extends in both front and rear directions starting from the left end portion of the horizontal line portion 15. The vertical line portion 17 on the right side extends in both front and rear directions starting from the right end portion of the horizontal line portion 15.

The horizontal line portion 15 and the vertical line portions 16 and 17 are composed of a single long cleavage groove or a plurality of short cleavage grooves. The latter plurality of cleavage grooves are formed at regular intervals so as to form a row in a state of being separated from each other.

In the case of a single long cleavage groove or a plurality of short cleavage grooves, the cleavage groove is recessed upward from the lower surface of the base material 13. In the case of a plurality of short cleavage grooves, the cleavage grooves may penetrate the base material 13 in the thickness direction. Then, in the base material 13, the strength is lower at the portion where the cleavage groove is formed than at the portion where the cleavage groove is not formed.

When the tear line 14 is composed of a plurality of short cleavage grooves, a thick portion is intermittently left between the adjacent cleavage grooves. A portion having a large thickness between the cleavage grooves is effective when it is desired to secure the rigidity of the tear line 14. When the thickness between the cleavage grooves is set appropriately, for example, the tear line 14 is suppressed from being deformed by an external factor such as a pressing force generated when the occupant puts his / her hand on the instrument panel main body 12 and puts his / her weight on it. It is possible.

The cleavage groove may be formed together with the base material 13 at the time of molding. Further, the cleavage groove may be formed by laser processing, ultrasonic processing, or the like in a post-process after molding the base material 13.
Next, the characteristic portion of this embodiment will be described.

As shown in FIG. 5, a chemical coating portion 51 is formed in a region of the back surface (lower surface) of each of the front fabric layer 23f and the rear fabric layer 23r that satisfies the following condition A.

Condition A: The area adjacent to the tearline 14 or the tearline 14 includes at least the projected portion.
In the present embodiment, the entire region of the fabric layer 23 in the entire instrument panel main body 12 including the airbag door 24 is defined as a region satisfying the above condition A.

The chemical application portion 51 is formed by applying a chemical that weakens the constituent yarns constituting the fabric layer 23 to the region of the fabric layer 23 that satisfies the above condition A.
As the chemical, an alkaline substance capable of corroding and weakening the constituent yarns of the fabric layer 23 is used. Examples of the applicable alkaline substance include caustic soda and sodium hydroxide.

The drug coating section 51 includes a plurality of front drug coating sections 51f each having a band shape, and a plurality of rear drug coating sections 51r each forming a band shape. The plurality of front chemical coating portions 51f extend in the front-rear direction on the back surface (lower surface) of the front fabric layer 23f in a state of being separated from each other in parallel. The plurality of front chemical coating portions 51f are formed at equal intervals in the left-right direction. On the other hand, the plurality of rear chemical coating portions 51r extend in the front-rear direction on the back surface (lower surface) of the rear fabric layer 23r in a state of being separated from each other in parallel. The plurality of rear chemical coating portions 51r are formed at equal intervals in the left-right direction. Further, the width of each front chemical coating portion 51f and the width of each rear chemical coating portion 51r are set wider than the width of the tear line 14. Further, the applied chemicals have not penetrated to the respective surfaces (upper surfaces) of the front fabric layer 23f and the rear fabric layer 23r.

Further, in the present embodiment, each rear drug coating section 51r is located between the front drug coating sections 51f adjacent to each other in the left-right direction, for example, in the central portion, in the left-right direction with respect to the front drug coating section 51f. It is formed by shifting the position. In other words, the front drug coating section 51f and the rear drug coating section 51r are arranged alternately in the left-right direction.

Next, the operation of the present embodiment configured as described above will be described. In addition, the effects caused by the action will also be described.
As shown in FIGS. 1 and 2, when no impact is applied to the vehicle 10 from the front, in the airbag device 30, the expansion gas is not ejected from the inflator 46 and is not supplied to the airbag 45. Therefore, the airbag 45 does not expand and is held in the folded state. The airbag opening 36 continues to be closed by the front door portion 37 and the rear door portion 41.

On the other hand, when an impact from the front is applied to the vehicle 10 due to a frontal collision or the like, expansion gas is ejected from the inflator 46 and is supplied to the airbag 45. By this supply, the airbag 45 starts to expand while the folded state is canceled (deployed).

In the process of expansion and expansion, a part of the pressing force of the airbag 45 is applied to the front door portion 37 and the rear door portion 41, respectively. The front door portion 37 is supported by the front hinge portion 38 and tries to be expanded toward the front side (upper side). Further, the rear door portion 41 tries to be expanded toward the front side (upper side) while being supported by the rear hinge portion 42. The airbag door 24 is pressed toward the front side (upper side) via the front door portion 37 and the rear door portion 41.

Here, the tear line 14 is formed on the base material 13 of the airbag door 24. In the base material 13, the strength of the portion where the tear line 14 is formed is lower than that of the portion where the tear line 14 is not formed.

Further, as described above, the strength of the joint portion between the front fabric layer 23f and the rear fabric layer 23r is lower than the strength of the other portions of the front fabric layer 23f and the rear fabric layer 23r.

Further, in the band-shaped portion of the fabric layer 23 in the airbag door 24 where the chemical application portion 51 is formed, the constituent yarn of the fabric layer 23 is weakened by the applied chemical. Of the fabric layer 23, the strength of the portion where the chemical coating portion 51 is formed on the back surface is lower than the strength of the portion where the chemical coating portion 51 is not formed. The fabric layer 23 is more likely to be broken at a portion where the chemical coating portion 51 is formed than at a portion where the chemical coating portion 51 is not formed on the back surface (lower surface).

The fabric layer 23 is formed with the strip-shaped weakened portions as described above separated from each other in parallel. Therefore, among the fabric layers 23 in the airbag door 24, the strength in the left-right direction, which is the arrangement direction of the plurality of chemical application portions 51, decreases, and the fabric layer 23 is likely to be broken in the same left-right direction.

Further, the chemical coating portion 51 is formed in a region of the back surface (lower surface) of the fabric layer 23 that satisfies the condition A.
Therefore, when the airbag door 24 is pressed toward the front side (upper side) via the front door portion 37 and the rear door portion 41 as described above, the base material 13 first moves left and right along the horizontal line portion 15. It breaks in the direction. Further, the skin 21 including the fabric layer 23 is broken in the left-right direction following the break of the base material 13.

Then, when the breakage of the base material 13, the cushion layer 22, and the fabric layer 23 progresses to both ends of the horizontal line portion 15 in the left-right direction, the base material 13 is moved to each vertical line portion 16 by the expanding force of the airbag 45. , 17 is broken in the front-back direction. Following this fracture, the skin 21 including the fabric layer 23 is fractured in the same front-rear direction.

As shown by the alternate long and short dash line in FIG. 2, the front door portion 37 is accompanied by the broken base material 13, the broken front cushion layer 22f and the front fabric layer 23f, and the front hinge portion 38 is used as a fulcrum. Tilt to the front side (upper side). Further, the rear door portion 41 is tilted to the front side (upper side) with the rear hinge portion 42 as a fulcrum together with the broken base material 13, the broken rear cushion layer 22r and the rear fabric layer 23r. These tilts open the airbag opening 36.

After passing through the opened airbag opening 36 and the broken portion of the airbag door 24, the airbag 45 continues to deploy and expand between the instrument panel body 12 and the passenger in the passenger seat, and the occupant Alleviates the impact applied from the front to the door.

According to this embodiment, the following effects can be obtained in addition to the above.
-In the fabric layer 23, where the chemical coating portion 51 is formed, the constituent yarns are weakened as described above. If the weakened constituent yarn is visible from the front side (upper side) of the instrument panel main body 12, the appearance of the instrument panel 11 is impaired. Further, when the chemical applied to the back surface (lower surface) of the fabric layer 23 penetrates to the front surface (upper surface) of the fabric layer 23 during the formation of the chemical coating portion 51, the chemical is applied from the front side (upper surface) of the instrument panel main body 12. It is visible, and the appearance of the instrument panel 11 is also impaired in this respect.

In this respect, in the present embodiment, the chemical coating portion 51 is formed on the back surface (lower surface) of the fabric layer 23. Therefore, it is possible to suppress the deterioration of the appearance of the instrument panel 11 due to the appearance of the weakened constituent threads.

Further, when the chemical agent coating portion 51 is formed, the chemical agent applied to the back surface (lower surface) of the fabric layer 23 does not penetrate to the front surface (upper surface) of the fabric layer 23. It is possible to suppress the deterioration of the appearance of the instrument panel 11 due to the visibility of the drug.

-In the present embodiment, the width of the chemical application portion 51 is set wider than the width of the tear line 14. Therefore, among the fabric layers 23 in the airbag door 24, the constituent yarns in the region satisfying the above condition A are weakened, and the fabric layer 23 can be easily broken along the tear line 14.

-In the present embodiment, the fabric layer 23 is only broken at the portion weakened by the application of the chemical, and the constituent threads of the fabric layer 23 are not cut by a knife or the like. Therefore, it is possible to prevent the yarn from fraying from the broken portion in the fabric layer 23.

-In the present embodiment, the entire region of the fabric layer 23 in the airbag door 24 is targeted, and band-shaped chemical coating portions 51 are formed at a plurality of locations in this region. The constituent yarns at the above points are weakened, and the strength at the same points is reduced.

Therefore, in the step of attaching the fabric layer 23 to the cushion layer 22 in the manufacturing of the instrument panel main body 12, the alignment of the fabric layer 23 becomes unnecessary or easy. By that amount, the time required for attaching the fabric layer 23 can be shortened.

-In this embodiment, an alkaline substance is used as a drug. Therefore, by applying this chemical to the fabric layer 23, the constituent yarns of the fabric layer 23 can be corroded and effectively weakened.

-In the present embodiment, a plurality of front drug application portions 51f are formed at equal intervals, and a plurality of rear drug application portions 51r are formed at equal intervals.
Therefore, among the back surfaces (lower surfaces) of the front fabric layer 23f and the rear fabric layer 23r, it is possible to evenly weaken the constituent yarns in the region satisfying the above condition A.

-In the present embodiment, the front chemical coating portions 51f and the rear chemical coating portions 51r are arranged alternately in the left-right direction. The boundary portion between the group of the front chemical coating portion 51f and the group of the rear chemical coating portion 51r extends in the left-right direction along the horizontal line portion 15 above the horizontal line portion 15.

Here, the case where each front drug coating portion 51f and each rear drug coating section 51r are arranged on the same straight line extending in the front-rear direction is compared.
In the present embodiment, the distance between the front drug coating portion 51f and the rear drug coating section 51r adjacent to each other in the left-right direction is the distance between the front drug coating section 51f and the rear drug coating section 51r adjacent to each other in the above comparison target. Becomes narrower than. Along with this, in the present embodiment, the strength at the boundary portion is lower than that of the comparison target.

Therefore, when the base material 13 in the airbag door 24 is broken in the left-right direction along the horizontal line portion 15, the skin 21 including the fabric layer 23 can be easily broken in the same direction.

It should be noted that the above embodiment can also be implemented as a modified example in which this is modified as follows. The above embodiment and the following modifications can be implemented in combination with each other within a technically consistent range.

<About Tearline 14>
The shape of the tear line 14 may be changed as shown in FIG. In the tear line 14 of this modification, the left vertical line portion 16 is composed of a portion 16f extending diagonally to the left front from the left end portion of the horizontal line portion 15 and a portion 16r extending diagonally to the left rear. The vertical line portion 17 on the right side includes a portion 17f extending diagonally to the right front from the right end portion of the horizontal line portion 15 and a portion 17r extending diagonally to the right rear. Also in this modification, the same operation and effect as those of the above embodiment can be obtained.

<About the epidermis 21>
-Unlike the above embodiment in which the epidermis 21 is composed of the front epidermis 21f and the rear epidermis 21r, the epidermis 21 may be composed of a single epidermis.

In this case, in addition to the tear line 14 of the base material 13, the tear line may be formed at a position corresponding to the upper part of the tear line 14 in the cushion layer 22. This tear line may be formed on the front surface (upper surface) of the cushion layer 22 or may be formed on the back surface (lower surface).

-The cushion layer 22 may be formed of a non-foaming material provided that it is a material having cushioning properties (elasticity).
-The configuration of the skin 21 may be changed on condition that the fabric layer 23 is provided on the surface layer portion. For example, a new layer may be provided in place of or in addition to the cushion layer 22.

<About the drug application part 51>
-In the above embodiment, the plurality of front drug application portions 51f may be formed at non-equal intervals in the left-right direction. Similar changes can be made to the plurality of rear chemical coating portions 51r.

-In the above embodiment, as shown in FIG. 5, a plurality of front chemical coating portions 51f in the front fabric layer 23f are arranged in parallel to form a stripe shape as a whole. Further, a plurality of rear chemical coating portions 51r in the rear fabric layer 23r are arranged in parallel to form a stripe shape as a whole.

On the other hand, the shape of the chemical coating portion 51 may be changed to a shape different from the stripe shape. 6 and 7 show examples of modifications thereof. In each modification, the drug coating section 51 is composed of a plurality of first drug coating sections 52 and a plurality of second drug coating sections 53. Each first agent application portion 52 has a band shape and extends in a state of being parallel to each other and separated from each other. Each second agent application portion 53 has a band shape and extends in a state of being parallel to each other and separated from each other. Each second drug coating section 53 extends in a direction orthogonal to each first drug coating section 52.

Each of the chemical coating portions 51 of FIGS. 6 and 7 has a grid pattern. The difference between the drug application section 51 of FIG. 6 and the drug application section 51 of FIG. 7 is as follows.
In the drug coating section 51 of FIG. 6, the first drug coating section 52 extends in the front-rear direction, and the second drug coating section 53 extends in the left-right direction. On the other hand, in the drug coating section 51 of FIG. 7, both the first drug coating section 52 and the second drug coating section 53 extend in a direction in which they are inclined in both the front-rear direction and the left-right direction.

In any of the modifications of FIGS. 6 and 7, the drug coating section 51 is composed of only a plurality of first drug coating sections 52, and the drug coating section 51 is composed of a plurality of second drug coating sections 53. In the fabric layer 23, the ratio of the chemical coating portion 51 to the unit area is higher than that in the case of being composed of only. Therefore, it is possible to efficiently weaken the constituent yarns of the portion of the constituent yarns of the fabric layer 23 that are desired to be weakened.

Although not shown, the first drug application section 52 may intersect the second drug application section 53 at an angle.
-A non-alkaline substance may be used as a chemical, provided that the application to the fabric layer 23 weakens the constituent yarns of the fabric layer 23.

-The chemical application portion 51 may be formed in a region different from the above embodiment, provided that it is a region of the back surface (lower surface) of the fabric layer 23 that satisfies the above condition A. The drug application portion 51 may be formed, for example, only in the area where the tear line 14 or the portion adjacent to the tear line 14 is projected.

The same changes as described above may be made for the first drug application section 52 and the second drug application section 53.
The width of the band-shaped chemical coating portion 51 does not necessarily have to be set larger than the width of the tear line 14, and may be set to the same or smaller value. The same changes as described above may be made for the widths of the first drug coating section 52 and the second drug coating section 53, respectively.

<Others>
The airbag device 30 may be an airbag device different from the airbag device 30 for the passenger seat.

A pair of door portions in the retainer 31 of the airbag device 30 may be arranged side by side in a direction different from the front-rear direction, for example, in the left-right direction.
-The instrument panel 11 can also be applied to an instrument panel in a vehicle other than the vehicle 10.

11 ... Instrument panel 12 ... Instrument panel body 13 ... Base material 14 ... Tearline 21 ... Skin 23 ... Fabric layer 24 ... Airbag door 30 ... Airbag device 45 ... Airbag 51 ... Drug application part 52 ... First drug application part 53 … Second drug application part

Claims (6)

The skeleton portion is composed of an instrument panel main body including a base material and an epidermis laminated on the front side of the base material, and an airbag device having an airbag that expands and expands by an expansion gas is arranged on the back side of the instrument panel main body. Instrument panel
The epidermis has a fabric layer formed of a woven fabric or a knitted fabric on the surface layer portion.
The instrument panel main body is provided with an airbag door at a position in front of the airbag in the deployment direction.
The base material in the airbag door is provided with a tear line that is a starting point of fracture when pressed by the airbag.
A chemical application portion to which a chemical that weakens the constituent yarns constituting the fabric layer is applied to at least a region of the back surface of the fabric layer including a portion where the tear line or a portion adjacent to the tear line is projected. The instrument panel on which it is formed. The instrument panel according to claim 1, wherein the agent is an alkaline substance. The drug-applied portion has a band shape.
The instrument panel according to claim 1 or 2, wherein the width of the chemical coating portion is set wider than the width of the tear line. A plurality of the drug application portions are provided.
Each drug application part has a band shape,
The instrument panel according to any one of claims 1 to 3, wherein the plurality of drug-applied portions extend in a state of being separated from each other in parallel. The instrument panel according to claim 4, wherein the plurality of drug-applied portions are formed at equal intervals. The drug coating portions are a plurality of first drug coating portions extending in a band shape and extending in parallel with each other, and a plurality of second drug coating portions extending in a band shape and extending in parallel with each other. And with
The instrument panel according to any one of claims 1 to 3, wherein each second drug application section intersects with each first drug application section.

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