JP2002211343A - Interior member for vehicle with air bag door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive interior member for a vehicle with an air bag door having high shock strength. SOLUTION: A wire net 23 having many through holes 23a is interposed between an instrument panel body 3 made of thermoplastic olefin resin and a door part 9 of the air bag door 5 made of thermoplastic elastomer. The instrument panel body 3 and the door part 9 are fused by electromagnetic heating or electric heating of the wire net 23. By mutually infiltrating fused resin into each through hole 23a of the wire net 23 and solidifying the resin, the door part 9 is joined integrally with a rear face of the instrument body 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interior member for a vehicle with an airbag door provided with an airbag door whose door portion opens when the airbag is deployed.

[0002]

2. Description of the Related Art The following technologies have been developed as interior members for vehicles with an airbag door.

<Japanese Patent Laid-Open Publication No. 2000-71924-Conventional Example 1> An airbag door is integrally joined to the back of an airbag device mounting portion of an instrument panel body as an interior member body by ultrasonic or vibration welding. I have.

<Japanese Patent Application Laid-Open No. 9-109816-Conventional Example 2> A vehicle interior member is formed on the rear surface of the air bag device mounting portion of a vehicle interior member made of polypropylene (PP) as an interior member body. Sometimes olefinic elastomers (T
PO) airbag doors are integrally joined. Alternatively, the cabin side member and the airbag door are formed and joined together by double injection.

[0005] Japanese Patent Application Laid-Open No. H11-78752-Conventional Example 3-A to-be-ruptured portion is formed at a place where an airbag device is attached to an instrument panel body as an interior member body, and a net is formed so as to avoid the to-be-ruptured portion. Insertion of reinforcing material consisting of In addition, only the rupture scheduled portion is made of an olefin-based elastomer (TPO).

<Japanese Patent Laid-Open Publication No. 11-91484-Conventional Example 3> An opening is formed at a mounting position of an airbag device of an instrument panel body made of polypropylene (PP) as an interior member body, and the opening is formed around the opening. The periphery of an olefin-based elastomer (TPO) airbag door is integrally joined by vibration welding or high-frequency induction heating.

[0007]

However, since the deployment pressure of the airbag acts instantaneously on the door portion of the airbag door, the door portion is prevented from scattering by the impact of the deployment of the airbag. It is preferable to make the wall thickness thicker than the wall thickness around the door part.

On the other hand, a thermoplastic olefin resin such as polypropylene (PP) is a general-purpose resin and is relatively inexpensive. Therefore, it is desirable to mold an instrument panel body having a large surface area from the viewpoint of reducing product cost. . On the other hand, the airbag door has a tough olefin-based elastomer (TPO) so that the door portion is not scattered by the impact of the airbag deployment since the deployment pressure of the airbag acts instantaneously on the door portion as described above. It is desirable to mold with a thermoplastic elastomer such as

[0009] Only the second conventional example satisfies these requirements.

However, in the case of an airbag door in which a large impact acts on the door portion as described above, it is necessary to take thorough measures to prevent the door portion from scattering due to the impact due to the deployment of the airbag from the viewpoint of safety. Required.

Further, when the instrument panel body and the airbag door are molded with different kinds of resins, the joining strength is not always satisfactory as compared with the case where they are molded with the same kind of resin. Incidentally, when molded with a thermoplastic olefin resin such as the same type of polypropylene (PP) as described above,
Not satisfactory in terms of impact strength.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an interior member for a vehicle with an airbag door which is inexpensive and has high impact strength.

[0013]

In order to achieve the above object, the present invention further reinforces a thick portion where an interior member main body and a door portion of an airbag door are overlapped, and fuses both resins. It is characterized in that the bonding strength is increased by doing so.

Specifically, the present invention provides an interior member main body in which a breakable portion which breaks when the airbag is deployed is formed;
An airbag door having a door portion integrally joined to a back surface of the interior member body and having a door portion that opens integrally with a part of the interior member body by breaking the portion to be broken when the airbag is deployed. The following solutions have been taken for interior parts for vehicles with an attachment.

That is, according to the first aspect of the present invention, the interior member main body is formed of a thermoplastic olefin resin, and the airbag door is formed of a thermoplastic elastomer. A conductive reinforcing material having a large number of through holes is interposed, and the molten resin of the interior member body and the door portion melted by electromagnetic heating or electric heating of the conductive reinforcing material is inserted into each through hole of the conductive reinforcing material. The door part is integrally joined to the back surface of the interior member body by infiltrating and solidifying each other.

According to the above construction, in the first aspect of the present invention, the joint portion between the interior member main body and the door portion of the airbag door is thickened by overlapping the two.
The airbag door is made of a thermoplastic elastomer, and the door portion has toughness.In addition, both resins are fused to form a conductive reinforcing material. Due to the entanglement, the door does not scatter even when an impact due to the deployment of the airbag acts. Also, since the interior member body is molded from relatively inexpensive general-purpose resin,
Product costs are reduced.

According to a second aspect of the present invention, the interior member main body and the airbag door are separately formed of a thermoplastic olefin resin, and a reinforcing material having a large number of through holes is inserted into the airbag door. The door portion is integrally joined to the back surface of the interior member body by vibration welding.

According to the above construction, in the invention according to the second aspect, the joint portion between the interior member main body and the door portion of the airbag door is thickened by overlapping the two.
Further, since the door is reinforced by a reinforcing material and both are made of the same kind of resin and are completely melted and integrated, the door does not scatter even when an impact due to the deployment of the airbag acts.
Further, since the interior member is formed of a relatively inexpensive general-purpose resin, the product cost is reduced.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 3 shows a front part of a passenger seat of an instrument panel 1 as an interior member for a vehicle. In this example, an airbag device 13 (see FIG. 1) described later is a front airbag device arranged in front of a passenger seat on the side of a driver's seat, and the airbag device 13 protects an occupant from an impact from the front-rear direction of the vehicle. It is supposed to
The present invention can be applied to a steering wheel pad to protect a driver. In addition, the present invention can also be applied to a case where the airbag device 13 is mounted on a vehicle interior member such as a center pillar garnish. The airbag device 13 is a so-called seamless type in which a mounting position is not known from the outside.

As shown in FIG. 1, an instrument panel 1 according to the first embodiment includes an instrument panel main body 3 as an interior member main body, and a back surface of the instrument panel main body 3 at a location where the airbag device 13 is mounted. , The airbag door 5 is integrally joined. The instrument panel body 3 is made of a general-purpose resin and relatively inexpensive thermoplastic olefin resin such as polypropylene (PP) and polyethylene (PE), and the airbag door 5 is made of an olefin elastomer having toughness and impact resistance. (TPO), polyester elastomer (TP
EE) and a thermoplastic elastomer such as a styrene-based elastomer (TPS).

The instrument panel body 3
A concave portion 7 having a V-shaped cross section is formed on the back surface of the mounting position of the airbag device 13, and the concave portion 7 has, as shown by a broken line in FIG. Left and right two vertically long recesses 7 extending forward from the both ends of the vehicle 7
b is formed in a substantially U-shape in plan view. And
The recess 7 forms a thin breakable portion 8 that is broken by the deployment pressure of the airbag 15 to form a thin brittle portion that is thinner than the general portion, and the breakable portion 8 also extends in the vehicle width direction. The left and right longitudinally ruptured portions 8a and the two left and right longitudinally ruptured portions 8b extending forward from both ends of the laterally ruptured portion 8a are formed in a substantially U-shape in plan view.

On the other hand, the airbag door 5 has a rectangular door portion 9 in a plan view integrally joined to the back surface of the instrument panel body 3 where the airbag device 13 is mounted, and a vehicle rear surface of the door portion 9. An airbag device 13 is mounted on the front and rear mounting plates 11 integrally protruding from the front and rear at intervals.

The airbag device 13 includes an airbag case 19 in which an airbag 15 and an inflator 17 in a folded state are stored.
9 is attached to the mounting plate 11 by engaging the locking claws 21a of the locking plate 21 with the engaging holes 11a of the two mounting plates 11, and the airbag device 13 is mounted on the back surface of the instrument panel body 3. Are located in

Further, the door 9 has a slit 9a.
Are cut out in a substantially U-shape in plan view corresponding to the breakable portions 8 of the instrument panel body 3.
The door 9 at the base end of the mounting plate 11 on the vehicle front side (right side in FIG. 1) of the two mounting plates 11.
Is formed with a concave portion 9b having a V-shaped cross section shallower than the concave portion 7, thereby forming a hinge portion 10. The concave portion 9b forming the hinge portion 10 is The two vertically elongated recesses 7b extend straight and parallel to the vehicle width direction at the front end of the vehicle and connect the front ends of the vertically elongated recesses 7b to each other (see a dashed line in FIG. 1).

In this embodiment, when the vehicle collides, the airbag 15 is deployed by the operation of the inflator 17, and the portion 8 to be broken is broken by the deployed pressure, so that the door portion 9 is attached to the instrument panel body 3. , That is, a rectangular region surrounded by the breakable portion 8 and the hinge portion 10 so that the hinge portion 10 can be opened upward with the hinge portion 10 as a fulcrum.

As a feature of the present invention, a wire mesh 23 as a conductive reinforcing material having a large number of through holes 23a is interposed between the instrument panel main body 3 and the door portion 9. The wire mesh 23 also has a slit 9 a of the door panel 9 and a breakable portion 7 of the instrument panel body 3.
The slit 23b is formed so as to have a substantially U-shape in plan view so as not to obstruct the opening operation of the door portion 9.

The instrument panel body 3
The door portion 9 is melted by electromagnetic heating or energizing heating of the wire mesh 23, and the molten resin of the instrument panel body 3 and the door portion 9 intrude into each through hole 23a of the wire mesh 23 and solidify. By doing so, both resins are fused and entangled with the wire netting 23, so that the door portion 9 is integrally joined to the back surface of the instrument panel main body 3.

As described above, the joint portion between the instrument panel body 3 and the door portion 9 of the airbag door 5 is made thick by overlapping the two, reinforced with the wire mesh 23, and furthermore, made of a thermoplastic elastomer resin. Since the airbag door 5 is formed to impart toughness to the door portion 9 and, in addition, both resins are fused and entangled with the wire mesh 23,
Even if an impact due to the deployment of the airbag 15 acts on the door portion 9, the door portion 9 can be prevented from scattering.
Further, since the instrument panel main body 3, which is a wide area other than the airbag door 5, is formed of a relatively inexpensive general-purpose resin, product cost can be reduced.

(Embodiment 2) FIG. 2 shows an instrument panel 1 according to Embodiment 2. In this example, the instrument panel body 3 and the airbag door 5 are separately formed of the same thermoplastic olefin resin, respectively, and a punch metal 25 as a reinforcing material having a large number of through holes 25a is used as a door. The first embodiment differs from the first embodiment in that it is inserted into the entire portion of the airbag door 5 and the mounting plate 11, that is, the door portion 9 is integrally joined to the back surface of the instrument panel body 3 by vibration welding. Otherwise, the configuration is the same as that of the first embodiment, and the same components are denoted by the same reference numerals, and detailed description thereof will be omitted. The punch metal 25 is also formed with a notch in a substantially U-shape in plan view corresponding to the breakable portion 7 of the instrument panel body 3 and the slit 9a of the door portion 9. The opening operation is not hindered.

Therefore, in the second embodiment, the joint portion between the instrument panel main body 3 and the door portion 9 of the airbag door 5 is made thick by overlapping the two, and is reinforced with the punch metal 25. Since both are made of the same kind of resin, the two are completely melted and integrated, so that even if the impact due to the deployment of the airbag 15 acts on the door 9 and the mounting plate 11, the door 9 and the mounting plate 11 It can be prevented from scattering. Further, since the entire instrument panel 1 is formed of a relatively inexpensive general-purpose resin, product costs can be reduced. In particular, when the airbag door 5 is formed of a thermoplastic olefin resin having a small toughness, the reinforcing material 25 is also inserted into the mounting plate 11.
When the airbag 15 is deployed, the mounting plate 11 does not scatter.

Although the wire mesh 23 is used as the insert material in the first embodiment, the metal wire 23 may be the punch metal 25 used in the second embodiment. Also, in the second embodiment, the metal wire 23 of the first embodiment may be replaced with the punch metal 25 used as the reinforcing material.

Further, in both the first and second embodiments, the case where the instrument panel body 3 is the type of the instrument panel 1 exposed to the outside has been described, but the surface of the instrument panel body 3 has a foam layer and a skin. May be an instrument panel 1 of a type in which are laminated. Further, an opening may be formed in the instrument panel body 3 and the airbag door 5 may be fitted into the opening.

In addition, the shape of the breakable portion 8 is not limited to a substantially U-shape, and may be of an H-shape having a double door opening upward in the vehicle front-rear direction.

[0035]

As described above, according to the first aspect of the present invention, a large number of penetrations are provided between the interior member body made of thermoplastic olefin resin and the door portion of the airbag door made of thermoplastic elastomer. With the conductive reinforcing material having a hole interposed, the interior member main body and the door portion are melted by electromagnetic heating or conduction heating of the conductive reinforcing material, and the molten resin is mutually penetrated into each through hole of the conductive reinforcing material. Since the door is integrally joined to the back of the interior member body by solidification, the airbag door portion increases in thickness due to the overlap between the interior member body and the door portion, the presence of conductive reinforcing material, the interior member The strength is increased by the fusion of the resin between the main body and the door portion and the entanglement of the molten resin with the conductive reinforcing material, and the scattering of the door portion due to the operation of the airbag can be prevented. Also, the product cost can be reduced by molding the interior member body with a relatively inexpensive general-purpose resin.

According to the second aspect of the present invention, the interior member body and the airbag door are separately formed of a thermoplastic olefin resin, and a reinforcing material having a large number of through holes is inserted into the airbag door. Because the door was integrally joined to the back of the interior member body by vibration welding,
The strength of the door is increased by increasing the thickness of the airbag door part due to the overlap between the interior member body and the door part, the interposition of reinforcing materials, and the complete integration of the same resin material between the interior member body and the door part. It is possible to prevent scattering of the section due to the operation of the airbag. Further, the entire interior member can be molded from a relatively inexpensive general-purpose resin to reduce product cost.

[Brief description of the drawings]

FIG. 1 is a sectional view corresponding to a line AA in FIG. 3 in the first embodiment.

FIG. 2 is a cross-sectional view corresponding to the line AA in FIG. 3 in the second embodiment.

FIG. 3 is a perspective view showing a front part of a front passenger seat of an instrument panel provided with an airbag door.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Instrument panel (interior member) 3 Instrument panel main body (interior member main body) 5 Airbag door 8 Expected break part 9 Door part 15 Airbag 23 Wire mesh (conductive reinforcing material) 23a, 25a Through hole 25 Punch metal (reinforcement) Material)

Continued on the front page F term (reference) 3D044 BA01 BA07 BB01 BC04 BC07 BC13 3D054 AA02 AA03 AA13 AA14 BB02 BB09 FF04

Claims (2)

[Claims] 1. An interior member main body having a portion to be broken which is to be broken when the airbag is deployed, and an interior member body which is integrally joined to the back surface of the interior member body and which breaks when the airbag is deployed. A vehicle interior member with an airbag door having an airbag door having a door portion that opens integrally with a part of the vehicle, wherein the interior member body is made of a thermoplastic olefin resin, and the airbag door is made of a thermoplastic material. A conductive reinforcing material having a large number of through-holes interposed between the interior member body and the door portion, the interior being melted by electromagnetic heating or electric heating of the conductive reinforcing material; The molten resin of the member main body and the door part penetrate into each through hole of the conductive reinforcing material and solidify, so that the door part is integrally joined to the back surface of the interior member main body. Vehicle interior member with the air bag door, characterized in that. 2. An interior member main body having a portion to be broken which is to be broken when the airbag is deployed, and an interior member body which is integrally joined to the back surface of the interior member body and which breaks when the airbag is deployed. An interior member for a vehicle with an airbag door having an airbag door having a door portion that opens integrally with a part of the interior member, wherein the interior member body and the airbag door are separately formed of a thermoplastic olefin resin. A reinforcing material having a large number of through holes is inserted into the airbag door, and the door portion is integrally joined to the back surface of the interior member body by vibration welding, for a vehicle with an airbag door. Interior components.