JP2003252159A - Burst structure of air bag door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost and improve quality of vehicle interior member having an air bag door. <P>SOLUTION: A substrate splitting expected part 22 extending along an outer edge line of the air bag door 20 disposed in a panel substrate is formed of stitches S using sewing threads 34 and 36. The substrate splitting expected part 22 has alternately positioned thread through-holes 38 and connecting parts 40 for forming a so-called perforation line. When the air bag device is operated, each connecting part 40 between the thread through-holes 38 breaks to allow opening of the air bag door 20 with respect to the panel substrate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaving structure for an airbag door, and more specifically, when an airbag device is actuated, a portion to be cleaved provided along an outer edge line of the airbag door is cleaved. The present invention relates to a cleaving structure of an airbag door which allows the opening of the airbag door.

[0002]

2. Description of the Related Art In recent years, most automobiles are equipped with an airbag device for a driver's seat and an airbag device for a passenger's seat as standard equipment in order to protect an occupant from an impact such as a collision accident. It has become. Of these, the airbag device for the passenger's seat is always installed inside the passenger's seat side of an instrument panel, which is installed in front of the passenger compartment as a vehicle interior member, in a retracted state. Therefore, in the instrument panel, an airbag door is provided at a portion corresponding to the airbag device, and the airbag door is opened and displaced into the passenger compartment by the pressing force of the airbag that expands during the operation of the airbag device, As a result, an air bag passage opening that allows passage of the air bag is defined.

FIG. 16 and FIG. 18 are schematic perspective views of an instrument panel provided with the air bag door. When the instrument panel currently used for implementation is divided from the structure, the panel base material 14 A single layer type instrument panel 10 (Fig. 16),
It can be roughly classified into a multi-layer type instrument panel 12 (FIG. 18) configured by disposing a skin 16 on the outer surface of the panel base material 14. Also, in the multi-layer type instrument panel 12, a two-layer type (not shown) configured by directly covering the outer surface of the panel base material 14 with the outer skin 16 or a cushion material on the outer side of the panel base material 14 is used. 3-layer type consisting of covering the skin 16 via 18
(Illustrated in FIG. 18) and the like.

Since the airbag door 20 in the single-layer type instrument panel 10 is provided at a required position of the panel base material 14 exposed to the passenger compartment, it is always a part of the design surface of the instrument panel 10. Are configured. Since the panel base material 14 is made of a relatively hard and brittle synthetic resin material such as polypropylene (PP) or polyethylene (PE), the airbag door 20 made of the same material as the panel base material 14 is used. When the pressing force of the airbag 52 in the airbag device 50 is applied to the airbag device 50, the airbag door 20 or its peripheral portion may be damaged. Therefore, as a measure for preventing the damage of the airbag door 20, a mode of reinforcing the door by arranging a door reinforcing member made of TPO (olefin-based thermoplastic elastomer) or metal on the back surface of the airbag door 20, As shown in FIGS. 16 and 17, for example, only the airbag door 20 is separately formed from a material having excellent impact resistance such as the TPO, and the airbag door 20 is installed at the installation opening 14a formed in the panel base material 14 at the rear side. The form of attachment is attached.

The airbag door has various opening modes.
(One-sided opening type, two-sided opening type, four-sided opening type, etc.) are implemented, but the airbag door 20 illustrated in FIG.
Is a double-open type that opens in the front-rear direction of the instrument panel 10. The airbag door 20 as described above is provided with H along the outer edge line of the airbag door 20.
By forming the V-shaped base material cleavage expected portion 22, when the pressing force of the airbag 52 is applied to the back surface, the base material cleavage expected portion 22 is ruptured and cleaved to allow the opening.

On the other hand, since the airbag door 20 in the multi-layer type instrument panel 12 is provided at a required position of the panel base material 14 on which the outer skin 16 is arranged, it is always attached to the outer skin 16. It is covered and is not exposed on the outer surface of the instrument panel 12. In the case of the double door type of the airbag door 20 as shown in FIG. 18, an H-shaped base material cleavage portion 22 is formed on the panel base material 14 along the outer edge line of the airbag door 20. By forming an H-shaped planned skin tear portion 24 along the outer edge line of the airbag door 20 on the outer skin 16, the base material tear scheduled portion when the pressing force of the airbag 52 is applied to the back surface. 22 and the planned epidermal cleavage site 24
Each of them is allowed to open due to breakage / cleavage. Note that FIG.
In the instrument panel 12 illustrated in FIGS. 8 and 19, a door reinforcing member 26 made of a material having excellent impact resistance such as TPO is provided on the back surface of the airbag door 20 provided on the panel base material 14. And is being reinforced.

[0007]

In the single-layer type and multi-layer type instrument panels 10 and 12 described above, however, the following drawbacks or problems are encountered when the airbag door 20 is provided so as to be openable. It was inherent. First, in the single-layer type instrument panel 10 shown in FIGS.
Since 0 is configured as a separate member from the panel base material 14, there is an inherent defect that the material cost, the processing cost, the assembly cost and the like of the airbag door 20 are added to increase the molding cost. Moreover, since the panel base material 14 and the airbag door 20 are made of different materials, there are subtle differences in texture, color tone, luster, luster, etc. due to the texture pattern formed on the outer surfaces of the two. Instrument panel 1
It was also pointed out that there was a problem that the texture quality was reduced to 0. Also,
The cleaving structure of the airbag door 20 by the base material cleaving part 22 is a form in which a groove 28 having a required depth is formed in an H shape along the back side outer edge line of the airbag door 20 to make it thin and weak. Therefore, the cleavage strength of the base material cleavage scheduled portion 22 depends on the molding accuracy (depth dimensional accuracy) of the groove 28, and when the groove 28 is too shallow, the base material scheduled cleavage portion 22 is appropriately formed. If the groove 28 is too deep, it is feared that the panel base material 14 is insufficient in strength when the airbag door 20 is not opened.

On the other hand, in the multi-layer type instrument panel 12 shown in FIG. 18 and FIG.
The airbag door 20 by the skin-breaking portion 24 provided in the
The cleaving structure is a form in which a groove 30 having a depth of about 0.5 mm is extended in an H shape on the front side or the back side of the epidermis 16 having a thickness of about 1 mm to weaken the epidermis. The actual thickness of the planned portion 24 is set to only about 0.5 mm. For this reason, even if the molding accuracy (depth dimensional accuracy) of the groove 30 is appropriate, for example, when the skin 16 is exposed to ultraviolet rays or heat from direct sunlight, the skin cut scheduled portion 24.
There was an inherent problem that lift-up and skin cracks along the edges tend to occur.

Furthermore, in the single-layer type instrument panel 10, as is apparent from FIG.
If 8 is formed along the back side outer edge line, there is an advantage that the base material cleavage expected portion 22 is not visually recognized from the outside of the instrument panel 10, but a boundary line is formed at the boundary portion between the airbag door 20 and the panel base material 14. 32 is visually recognized as a frame line. Moreover, since the boundary line 32 simply extends in a linear shape, it does not have any decorative function and does not contribute to improving the texture of the instrument panel 10. On the other hand, in the multi-layer type instrument panel 12, as is clear from FIG. 18, when the groove 30 for forming the epidermal cleavage scheduled portion 24 is extended to the front side of the epidermis 16, the epidermal cleavage scheduled The part 24 is visually recognized as a line. In addition, since the epidermal rupture portion 24 simply extends in a linear shape, it does not have any decorative function, and does not contribute to improving the texture of the instrument panel 12.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to suitably solve the above-mentioned problems, and the portion to be cleaved provided on the base material or the outer skin along the outer edge line of the airbag door is stitched by using a sewing thread. It is an object of the present invention to provide a cleaving structure for an airbag door, which is suitable for reducing the cost and improving the texture of the vehicle interior member provided with the airbag door.

[0011]

SUMMARY OF THE INVENTION In order to solve the above problems and achieve the intended object, the present invention provides a base material for a vehicle interior member provided with an air bag door, along an outer edge line of the air bag door. In the cleaving structure of the airbag door, in which the cleaving part is provided so as to extend, and the cleaving part is cleaved when the air bag device is activated, the cleaving part is a sewing thread. When the air bag device is operated, the continuous portion located between the thread passage holes formed by the stitch is broken to allow the opening of the air bag door. It is characterized by being configured.

Similarly, in order to solve the above-mentioned problems and achieve the intended purpose, another invention is to provide an outer peripheral line of the airbag door on a skin which is adhered to a base material of a vehicle interior member provided with the airbag door. In the cleaving structure of the airbag door, which is provided with a planned skin cleaving portion that extends along the claw, and allows the opening of the airbag door by cleaving the skin cleaving planned portion when the airbag device is actuated. The predetermined portion is formed by a stitch using a sewing thread, and when the airbag device is operated, the continuous portion located between the respective thread through holes formed by the stitch is broken, and the airbag door It is characterized in that it is configured to allow opening.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, with reference to the accompanying drawings, a preferred embodiment of the cleaving structure of an airbag door according to the present invention will be described below. It should be noted that when the conventional technique is described with reference to FIGS.
The same members and parts as the parts will be described with the same reference numerals.

[0014]

[First Embodiment] FIG. 1 is a schematic perspective view of an instrument panel adopting a split structure of an airbag door according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. It is a figure. The instrument panel 10 of the first embodiment is
It is a single-layer type composed of a panel base material 14 formed into a required shape. The panel substrate 14 is, for example, P
It is made of synthetic resin made of a material in which a filler is added to P (polypropylene), and is molded to a thickness of about 3 mm by the injection molding technique. An airbag door 20 corresponding to the airbag device 50 is provided in front of the passenger seat side of the panel base material 14,
An airbag 5 that is inflated when the airbag device 50 is operated.
The air bag door 20 is opened and displaced to the passenger compartment by the pressing force of 2, and an air bag passage opening that allows the air bag 52 to pass is defined. The first embodiment exemplifies a double-opening type airbag door that opens in the front-rear direction of the instrument panel 10.

The airbag door 20 has a panel base material 1.
4 is formed integrally with the panel base material 14 at the time of molding 4, and is made of the same material as the panel base material 14, and is an instrument panel as a part of the panel base material 14 before the operation of the airbag device 50. It constitutes 10 design surfaces. Therefore, on the back side of the airbag door 20, a door reinforcing member 26 made of TPO is provided.
Is reinforced and damage is prevented. Further, a base material cleavage scheduled portion 22 is extended on the outer edge line of the airbag door 20 as described later, and the airbag device 50 is operated to apply the pressing force of the airbag 52 to each airbag. When the base material is added to the door 20, the base material cleavage portion 22
When the air bag door 20 is broken or opened, the air bag door 20 is allowed to open outward.

In the tear structure of the airbag door according to the first embodiment, the base material cleavage portion 22 formed on the panel base material 14 and exposed on the outer surface of the instrument panel 10 is not shown in the industrial sewing machine. Sewing thread 34,3
It is formed by the stitch S using 6. That is, the base material cleavage scheduled portion 22 is, as shown in FIGS. 3 and 4, a first upper thread located on the front side of the panel base material 14.
By forming the stitch S at a required pitch along the outer edge line of the airbag door 20 with the sewing thread 34 and the second sewing thread 36 as a lower thread located on the back side of the panel base material 14, Required pitch P due to penetration
The thread passing hole 38 is provided for each of the holes, and the connecting portion 40 is located between the thread passing holes 38 adjacent to each other. Therefore,
The base material cleavage scheduled portion 22 formed along the outer edge line of the airbag door 20 has a "perforated" shape as shown in FIGS. 5 (a) and 5 (b).

As described above, in the split structure of the airbag door according to the first embodiment, the panel base material 14 has a plurality of thread holes formed at the pitch P along the outer edge line of the airbag door 20. (Through hole) 38 and each thread through hole 38
By constructing the base material cleavage scheduled portion 22 with a plurality of continuous portions 40 that are intermittently formed with the air bag door 20 sandwiched therebetween, the outer edge portion of the airbag door 20 is made thin without weakening it. There is. As a result, the air bag device 50 operates and the pressing force of the air bag 52 is applied to the air bag doors 2 respectively.
When applied to 0 and 20, as a result of the rupture of the respective connecting portions 40 in which the stress concentrates, the base material cleavage scheduled portion 22 is entirely ruptured, and the opening of both airbag doors 20 is permitted.

Here, the first sewing thread 34 and the second sewing thread 36 used for forming the stitch S are made of polyester, for example, having a diameter of about 1 mm, and are appropriately colored. That is, the first sewing thread 34 (and the second sewing thread 36) is coordinated with the color of the panel base material 14 and the color of the first sewing thread 34 (and the second sewing thread 36).
Instrument panel 10
Considered to improve the texture of the. However, the first
The sewing thread 34 and the second sewing thread 36 only function as a decorative material of the instrument panel 10, and do not have a function of promoting the cleavage of the base material cleavage scheduled portion 22.

The first sewing thread 34 and the second sewing thread 3 are also provided.
Each thread through hole 3 formed by the stitch S composed of 6
The pitch P of 8 is set to at least 1 mm or more. Further, the diameter D of each thread passage hole 38 formed by the stitch S is set to 0.5 mm or more.
That is, if the pitch P of the thread passing holes 38 is set small and the hole diameter D of the thread passing holes 38 is set large, the formation width of each continuous portion 40 becomes small and the strength of the base material cleavage scheduled portion 22 decreases. On the contrary, if the pitch P of the thread passing holes 38 is increased and the hole diameter D of the thread passing holes 38 is set to be small, the formation width of each continuous installation portion 40 is increased and the base material cleavage planned portion. 22 is improved in strength.

The formation of the stitch S by the industrial sewing machine is carried out in a state where the vicinity of the outer edge line of the airbag door 20 is appropriately preheated by a heating means (heater or the like) to be appropriately softened. The sewing needle easily penetrates the panel base material 14 having a thickness of about 3 mm, so that the stitch S is easily and surely formed. In order to facilitate the formation of the stitch S, as shown in FIG. 3 or 4, a groove 42 having an appropriate depth is formed along the outer edge line of the airbag door 20 to form a stitch forming portion (airbag door). The outer edge line (20) may be thin. However, forming the groove 42 is not an essential requirement of the cleavage structure according to the first embodiment.

As described above, in the split structure of the airbag door according to the first embodiment, in the instrument panel 10 composed of the panel base material 14, the outer edge line of the airbag door 20 provided on the panel base material 14 is provided. Sewing thread 3 along
By forming the stitch S using 4, 36, the thread-cutting holes 38 formed at the required pitch P at this time and the continuous portion 40 located between the thread-threading holes 38 are used as the base material cleavage portions. 22
Was formed. Therefore, by appropriately adjusting the pitch P and the hole diameter D of the thread passage holes 38 when forming the stitch S, it becomes easy to appropriately set the tear strength of the base material cleavage scheduled portion 22, and the respective airbag doors. 20 can be opened appropriately. Particularly, since the continuous portions 40 are intermittently provided with a required length, the airbag door 2
When 0 is not opened, sufficient strength can be ensured, and when the pressing force of the airbag 52 is applied to the airbag door 20, the respective connecting portions 40 are easily broken.

Further, since the stitch S is formed directly on the panel base material 14 to form the airbag door 20 from a part of the panel base material 14, the panel base material 14 and the airbag door 20 are formed. The texture, color tone, luster and the like are the same, and the texture of the instrument panel 10 is not deteriorated. Moreover, since it is not necessary to form the airbag door 20 as a separate member such as TPO, the material cost, the processing cost, the assembly cost and the like of the airbag door can be reduced and the molding cost can be reduced. Furthermore, by coordinating the colors of the sewing threads 34 and 36 used for forming the base material cleavage scheduled portion 22 and the color of the panel base material 14, the sewing threads 34 and 3 can be coordinated.
6 can be made to function as a decorative material, and the texture of the instrument panel 10 can be improved.

[0023]

[Second Embodiment] FIG. 6 is a schematic perspective view of an instrument panel adopting a cleaving structure of an airbag door according to a second embodiment of the present invention, and FIG. 7 is a sectional view taken along line VII-VII of FIG. It is a figure. Instrument panel 12 of the second embodiment
Is of a multi-layer (three-layer) type configured by attaching the outer skin 16 to the outer surface of the panel base material 14 formed into a required shape via the cushion material 18. The panel base material 1
Reference numeral 4 is made of a synthetic resin, for example, made of a material in which a filler is added to PP (polypropylene), and is molded to a thickness of about 3 mm by an injection molding technique. The skin 16 is formed from a resin sheet based on a vacuum forming technique, formed from resin powder based on a powder slush forming technique, or formed from polyurethane based on a spray forming technique. The cushion material 18 is a urethane foam material formed by foaming a urethane material between the panel base material 14 and the skin 16. An air bag door 20 corresponding to the air bag device 50 is provided in front of the passenger seat side of the panel substrate 14, and the air bag device 50 is inflated when the air bag device 50 is actuated. The airbag door 20 is opened and displaced to the passenger compartment, and an airbag passage opening that allows passage of the airbag 52 is defined. In the second embodiment, the instrument panel 12
2 illustrates an example of a double-opening type airbag door that opens in the front-rear direction.

The airbag door 20 has a panel base material 1
4, which is formed integrally with the panel base material 14 at the time of molding 4, is made of the same material as the panel base material 14, and is configured as a part of the panel base material 14 before the operation of the airbag device 50. The outer surface of the panel base material 14 is covered with the outer skin 16 and is not exposed to the outer surface of the instrument panel 12. Also, on the back side of the airbag door 20,
A door reinforcing member 26 made of TPO is provided to reinforce the airbag door 20 and prevent damage. A groove 28 is formed on the outer edge line of the airbag door 20.
The H-shaped base material cleavage scheduled portion 22 that is made thin and weakened by forming the
When the 0 is actuated and the pressing force of the airbag 52 is applied to each of the airbag doors 20, the base material cleavage scheduled portion 22 is broken or cleaved.

On the other hand, in the outer skin 16, an H-shaped outer skin rupture portion 24 is extended along the outer edge line of the air bag door 20 as described later, and the air bag device 50 operates. When the pressing force of the airbag 52 is applied to the respective airbag doors 20, the base material rupturing portion 22 and the epidermis rupturing portion 24 are appropriately ruptured and ruptured, respectively. Open to the outside is allowed.

In the cleaving structure of the airbag door according to the second embodiment, the skin cleaving portion 24 formed on the skin 16 and exposed on the outer surface of the instrument panel 12 is described.
Is formed with a stitch S using sewing threads 34 and 36 by an unillustrated industrial sewing machine. That is, as shown in FIG. 8 and FIG. 9, the epidermis cleavage scheduled portion 24 includes the first sewing thread 34 as the upper thread located on the front side of the epidermis 16 and the second suture thread as the lower thread located on the back side of the panel base material 14.
By forming the stitch S at a required pitch along the outer edge line of the airbag door 20 with the sewing thread 36, the stitch S is formed adjacent to the thread passage hole 38 formed at a required pitch P by penetration of a sewing needle (not shown). And a continuous portion 40 located between the thread passing holes 38. That is, the skin-breaking portion 24 formed on the skin 16 along the outer edge line of the airbag door 20 has a "perforation" shape as shown in FIGS. 10 (a) and 10 (b).

As described above, in the split structure of the airbag door according to the second embodiment, the outer skin 16 has a plurality of thread passage holes (penetrating holes) formed at every pitch P along the outer edge line of the airbag door 20. (A hole) 38 and a plurality of consecutively-provided portions 40 that are intermittently formed with the thread passing holes 38 sandwiched between them to form the skin cut portion 24, which is aligned with the outer edge portion of the airbag door 20. It is designed to have a fragile portion without thinning. Thereby, the airbag device 5
When 0 is actuated and the pressing force of the airbag 52 is applied to the respective airbag doors 20, 20, as a result of rupture of the respective connecting portions 40 in which stress concentrates, the skin-cutting planned portion 2
4 is opened as a whole, and opening of both airbag doors 20 is allowed.

The first sewing thread 34 and the second sewing thread 36 used for forming the stitch S are basically the same as those in the first embodiment, and are made of polyester having a diameter of about 1 mm, for example. And is appropriately colored. That is, by coordinating the color of the outer skin 16 and the color of the first sewing thread 34 (and the second sewing thread 36),
It is considered that the first sewing thread 34 (and the second sewing thread 36) functions as a decorative material to improve the texture of the instrument panel 12. However, the first sewing thread 34 and the second sewing thread 34
The sewing thread 36 only functions as a decorative material of the instrument panel 12, and does not have a function of promoting the cleavage of the epidermal cleavage scheduled portion 24.

The first sewing thread 34 and the second sewing thread 3 are also provided.
Each thread through hole 3 formed by the stitch S composed of 6
The pitch P of 8 is set to at least 1 mm or more. Further, the diameter D of each thread passage hole 38 formed by the stitch S is set to 0.5 mm or more.
That is, if the pitch P of the thread passing holes 38 is set to be small and the hole diameter D of the thread passing holes 38 is set to be large, the formation width of each continuous portion 40 becomes small and the strength of the skin cut portion 24 is reduced. On the contrary, if the pitch P of each thread passing hole 38 is increased and the hole diameter D of each thread passing hole 38 is set to be small, the formation width of each continuous portion 40 is increased, and the cut portion 24 of the epidermis to be split. Strength is improved.

As described above, in the split structure of the airbag door according to the second embodiment, in the instrument panel 12 constructed by covering the panel base material 14 with the outer skin 16, the air provided on the panel base material 14 is removed. By forming the stitch S using the sewing threads 34 and 36 on the outer skin 16 along the outer edge line of the bag door 20, the thread passing holes 38 and the thread passing holes 38 formed at the required pitch P at this time are formed. The continuous cut portion 40 located between them forms the epidermal rupture scheduled portion 24. Therefore, by appropriately adjusting the pitch P and the hole diameter D of the thread passage holes 38 when forming the stitch S, it becomes easy to appropriately set the tear strength of the planned skin tear portion 24, and the respective airbag doors 20. Can be opened appropriately.

And, unlike the conventional cleaving structure in which the skin cleaving portion 24 is provided by the weakening of the skin 16,
Since the thickness of the epidermal cleavage scheduled portion 24 is not small,
Even if the epidermis 16 is exposed to ultraviolet rays or heat generated by direct sunlight, it is possible to prevent the rise of the epidermis along the planned epidermal cleavage portion 24, the epidermis cracking, or the like. Furthermore, the epidermis cleavage scheduled part 2
By coordinating the colors of the sutures 34, 36 used for forming No. 4 and the color of the outer skin 16,
36 can be made to function as a decorative material, and the texture of the instrument panel 12 can be improved.

Here, the three-layer type instrument panel 12 adopting the split structure of the airbag door according to the second embodiment is molded as follows. The skin 16
Is preformed based on any one of the above-mentioned forming techniques such as vacuum forming, powder slush forming, or spray forming, and then the stitch S is formed by using the sewing threads 34 and 36 to provide the skin cut portion 24. . Then, the above-mentioned skin 1 in which the skin-cleavage scheduled portion 24 by the stitch S is provided in advance
6 and the separately preformed panel base material 14 are set in a foam molding die (not shown) for foam-molding the cushion material 18, and the cushion material 18 is foam-molded between the members 14 and 16. . As a result, the panel substrate 1
The outer skin 16 is covered with the outer skin 16 via a cushion material 18. However, when the cushion material 18 is foam-molded, the cushion material 18 before curing may leak from each thread hole 38 formed by forming the stitch S in the outer skin 16, so as shown in FIG. Prior to molding the cushion material 18, it is desirable that a seal material 44 for covering the thread passage hole 38 is attached to the back side of the outer skin 16.

FIG. 12 exemplifies a case in which the cleaving structure of the airbag door according to the second embodiment is adopted in a two-layer type instrument panel 12. In this instrument panel 12, after the skin 16 is preformed based on any one of the above-mentioned vacuum forming, powder slush forming, or spray forming techniques, the sewing thread 3 is formed.
By forming the stitch S by using 4, 36, the epidermis cleavage scheduled portion 24 is provided. Then, as shown in FIG. 12 (a), the skin 16 having the skin-cleaving planned portion 24 by the stitch S in advance is attached to the outer surface of the panel base material 14 which has been separately preformed, whereby the instrument panel 12
Are formed (FIG. 12B). Such a two-layer type instrument panel 12 is provided in the airbag device 50.
Is activated and the pressing force of the airbag 52 is applied to the airbag door 2
When added to 0, the base material cleavage scheduled portion 22 and the epidermis cleavage scheduled portion 24 are respectively appropriately cleaved to allow proper opening of the airbag door 20.

The two-layer type instrument panel 12 can also be molded as shown in FIG. That is, the skin 16 preformed based on any of the above-described molding techniques is first attached to the outer surface of the panel base material 14 which is separately preformed (FIG. 13A), and then the outer edge line of the airbag door 20. Along the sewing thread 34,36
The stitch S using the skin 16 and the panel base material 14
By forming the base material to be cleaved, the base material cleavage scheduled portion 22 and the epidermal cleavage scheduled portion 24 are simultaneously formed (FIG. 13B). In this case, the epidermal cleavage scheduled portion 24 and the base material cleavage scheduled portion 22
Each of them is composed of a thread passage hole 38 and a continuous portion 40 located between the thread passage holes 38.

Here, in FIGS. 12 and 13, a single layer type skin 16 is attached to the panel base material 2 to form a structure 2.
Although the layer type instrument panel 12 is illustrated,
The outer skin 16 can be suitably implemented even if it is of a multi-layer type having two or three layers.

In each of the above-described embodiments, the double-opening type airbag door 20 is provided by providing the H-shaped cleavage scheduled portions 22 and 24 on the panel base material 14 or the skin 16, but the scheduled cleavage due to the formation of the stitch S. If the portions 22 and 24 are provided in a U-shape, it is possible to correspond to a single-opening type airbag door 20 (Fig. 14), and if the portions 22 and 24 to be split are provided in both Y-shapes, a four-way opening type airbag is provided. Door 20
(Fig. 15).

Further, the vehicle interior member in which the split structure of the airbag door of the present application is implemented is not limited to the instrument panel 12 described above, and for example, the horn pad portion of the steering wheel, the pillar garnish, etc., the airbag door. All vehicle interior members provided with are targeted.

[0038]

As described above, according to the cleaving structure of the airbag door of the present invention, in the vehicle interior member composed of the base material, the sewing thread is provided along the outer edge line of the airbag door provided on the base material. By forming the stitches used,
At this time, the base material cleavage planned portion is formed by the thread passage holes formed at the required pitch and the continuous portion located between the thread passage holes. Therefore, by appropriately adjusting the pitch and the hole diameter of the threading holes when forming the stitch, it becomes easy to appropriately set the tear strength of the base material to-be-cleaved portion and appropriately open each airbag door. There is an advantage to get. Further, since the airbag door is formed from a part of the base material, the texture of the base material and the airbag door,
There is also an advantage that the color tone and gloss are the same and the texture of the vehicle interior member is not deteriorated. Moreover, the airbag door is TPO
Since there is no need to form it as a separate member such as, there is an effect that the material cost, the processing cost, the assembly cost and the like of the airbag door can be reduced and the molding cost can be reduced. Further, by coordinating the color of the sewing thread used when forming the base material cleavage scheduled portion and the color of the base material, the sewing thread can be made to function as a decorative material, which is advantageous in that the texture of the vehicle interior member can be improved. Has a great effect.

Similarly, according to another aspect of the invention, there is provided an air bag door cleaving structure, which is a vehicle interior member constructed by covering a base material with a skin so as to follow an outer edge line of the air bag door provided on the base material. By forming a stitch using a sewing thread on the outer skin, at this time, the epidermal cleavage planned portion is formed by the thread passage holes formed at a required pitch and the continuous portion located between the thread passage holes. did. Therefore, by appropriately adjusting the pitch and the hole diameter of the thread passage holes when forming the stitch, it becomes easy to properly set the tear strength of the planned skin tear portion, and each airbag door can be opened appropriately. There are advantages. In addition, since the skin thickness does not become small even if the planned skin-opening portion is provided, even if the skin is exposed to ultraviolet rays or heat from direct sunlight, the skin will be lifted or cracked along the planned skin-opening portion. Can be prevented. Furthermore, by coordinating the color of the sewing thread used when forming the portion to be split with the skin and the color of the skin, the sewing thread can be made to function as a decorative material, and a beneficial effect such as improving the texture of the vehicle interior member can be achieved. Play.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a single-layer type instrument panel adopting a cleaving structure of an airbag door according to a first embodiment of the present invention.

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

FIG. 3 is a partial plan view showing a portion of a panel base material forming an instrument panel, in which a base material cleavage scheduled portion is provided along an outer edge line of an airbag door.

4A is a sectional view taken along line IVa-IVa in FIG. 3, and FIG. 4B is a sectional view taken along line IVb-IVb in FIG.

FIG. 5 (a) is a vertical cross-sectional side view of a base material cleavage scheduled portion shown in a state in which a sewing thread forming a stitch has been removed, and FIG.
It is the top view which looked at the base material cleavage part from above.

FIG. 6 is a schematic perspective view of a multi-layer (three-layer) type instrument panel adopting a split structure of an airbag door according to a second embodiment of the present invention.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a partial plan view showing a portion of a skin constituting an instrument panel, where a skin tear scheduled portion is provided along an outer edge line of an airbag door.

9A is a sectional view taken along line IXa-IXa in FIG. 8, and FIG. 9B is a sectional view taken along line IXb-IXb in FIG.

FIG. 10 (a) is a vertical cross-sectional side view of an epidermal rupture planned portion shown in a state in which a sewing thread forming a stitch is removed.
[Fig. 3] is a plan view of a planned cut portion of the epidermis seen from above.

11 is an enlarged cross-sectional view of the main parts of FIG.

FIG. 12 is an explanatory cross-sectional view illustrating a case where the cleaving structure of the airbag door according to the second embodiment is adopted in a two-layer type instrument panel, in which (a) shows stitches formed after preforming. Shows the state of pasting the skin with the planned skin cleavage part on the outer surface of the separately preformed panel substrate,
(b) has shown the state which stuck the skin on the panel base material.

FIG. 13 is an explanatory cross-sectional view illustrating a case where the cleaving structure of the airbag door according to the second embodiment is adopted in a two-layer type instrument panel, in which (a) shows a preformed skin separately prepared. The state where it sticks to the outer surface of the molded panel base material is shown, and (b) shows that the base material is to be cleaved by forming a stitch from the surface skin to the panel base material after sticking the surface skin to the panel base material. It shows a state in which the planned epidermal cleavage site has been formed.

FIG. 14 is an explanatory diagram showing that a portion to be cleaved by forming a stitch is provided in a U-shape to correspond to a single-open type airbag door.

FIG. 15 is an explanatory view showing that a planned cleavage portion due to formation of stitches is provided in both Y-shapes to correspond to a four-way opening type airbag door.

FIG. 16 is a schematic perspective view of a single-layer type instrument panel adopting a conventional airbag door cleaving structure.

17 is a cross-sectional view taken along the line YY of FIG.

FIG. 18 is a schematic perspective view of a three-layer type instrument panel that adopts a conventional airbag door cleaving structure.

19 is a sectional view taken along line ZZ of FIG.

[Explanation of symbols]

14 Panel base material (base material) 16 epidermis 18 Cushion material 20 airbag door 22 Substrate cleavage expected part 24 Area of planned epidermal cleavage 34 1st sewing thread (sewing thread) 36 Second sewing thread (sewing thread) 38 Thread hole 40 consecutive parts D hole diameter P pitch S stitch

Claims (7)

[Claims] 1. A base material cleavage portion (22) which extends along an outer edge line of the airbag door (20) on a base material (14) of a vehicle interior member provided with an airbag door (20). In the cleaving structure of the airbag door that allows the opening of the airbag door (20) by cleaving the substrate cleaving part (22) when the airbag device is activated, the substrate cleaving part ( 22) is formed by stitches (S) using sewing threads (34, 36), and when the airbag device is operated, it is located between the thread passage holes (38) formed by the stitches (S). Connected section
(40) A tear structure for an airbag door, characterized in that the airbag door (20) is broken so that the airbag door (20) can be opened. 2. A skin (16) adhered to a base material (14) of a vehicle interior member having an airbag door (20) extending along an outer edge line of the airbag door (20). The airbag door (20) is provided with a planned skin-cleavage portion (24) so that the skin-cleavage scheduled portion (24) is cleaved when the airbag device is activated.
In the cleaving structure of the airbag door that allows the opening of the, the skin cleaving part (24) is formed by stitches (S) using sewing threads (34, 36), and when the airbag device is activated, the stitches are performed. (S) The continuous portion located between the respective thread holes (38) formed by
(40) A tear structure for an airbag door, characterized in that the airbag door (20) is broken so that the airbag door (20) can be opened. 3. The skin (16) is directly adhered to the outer surface of the base material (14), and the skin tear portion (24) is aligned along the outer edge line of the airbag door (20). The opening structure of the airbag door according to claim 2, wherein 4. The skin (16) is a cushion material (1) having a required thickness.
8) is attached to the outer surface of the base material (14) via the outer surface of the airbag door (20) along the outer edge line.
The split structure for an airbag door according to claim 2, wherein the (24) is aligned. 5. Each thread through hole (3) formed by the stitch (S).
The split structure of the airbag door according to any one of claims 1 to 4, wherein the pitch (P) of 8) is set to 1 mm or more. 6. Threading holes (3) for each of the stitches (S)
The cleaving structure for an airbag door according to any one of claims 1 to 5, wherein the hole diameter (D) of 8) is set to 0.5 mm or more. 7. The cleaving structure for an airbag door according to claim 1, wherein the sewing thread (34, 36) functions as a decorative material.