JP2001163157A - Automobile interior equipment having lid body for air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide automobile interior equipment having a lid body for an air bag that can simplify a die structure and does not require formation of a mounting member projecting on an air bag device in a rapping direction. SOLUTION: The air bag device 58 is mounted on the automobile interior equipment. The equipment comprises an interior equipment body 14 and the lid body 16 for the air bag. A mounting wall 24 jointed to the air bag device is formed around the rear surface of the lid body 16. The rapping direction of the interior equipment body crosses a bag jumping direction. At least one of front and rear mounting walls 24a, 24b of the mounting wall is formed in the same direction as the rapping direction, an integral hinge part 25 is formed over the position of a mounting part 23 of the mounting wall 24b, and the mounting part 23 of the mounting wall 24b is folded at the integral hinge part 25 to be fixed to the air bag device 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrument panel, a door trim, and an airbag device.
The present invention relates to an automobile interior part having a lid for an airbag such as a seat back.

[0002] Here, an instrument panel (hereinafter abbreviated as "instrument panel") will be mainly described as an example, but the invention is not limited to this.

[0003] In this specification, the front, rear, left and right of an automobile interior product (instrument) are based on the front, rear, left and right of the vehicle when mounted on an actual vehicle, unless otherwise specified.

[0004]

[Related Art] As this kind of automobile interior goods, for example,
Instrument panel 112 having a basic curved cross section as shown in FIG.
In the case of, the following configuration is provided.

The main body 114 and the lid 11 for the airbag
6, the main body portion 114 and the lid portion 116 are integrally formed so that the front surfaces thereof are substantially flush with each other, and a rectangular cylindrical mounting portion connected to the airbag device is provided around the back surface of the lid portion 116. Walls 118a and 118b are formed. Reference numeral 120 denotes a design sheet that is insert-molded to improve the design.

[0006]

The instrument panel 112 is formed by using a mold having a movable mold 122 and a fixed mold 124 as shown in the figure. The mold is opened in a direction orthogonal to the maximum bulging portion of the curved cross section so that no undercut occurs in the curved cross section of the main body. As a result, the front and rear mounting walls 118a and 118b formed substantially upright with respect to the upper surface of the instrument panel 112 form an undercut that intersects the die-cutting direction (white arrow).

For this reason, the front and rear mounting walls 118a, 118
b, the first and second slide cores 126, 12
8 and the mold structure becomes complicated.

To solve this problem, Japanese Patent Application Laid-Open No.
As described in JP-A-156444, it is conceivable to form one of the front and rear mounting walls (rear mounting wall) in the same direction as the die-cutting direction. It is necessary to form a mounting bracket (mounting member) projecting in a direction parallel to the mounting end of the rear mounting wall, that is, in the die-cutting direction, on the bag case).

SUMMARY OF THE INVENTION In view of the above, the present invention makes it possible to simplify the mold structure, and does not require the airbag device to be provided with a mounting member protruding in the direction of die release. The purpose is to provide.

[0010]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have set at least one of the front and rear mounting walls of the mounting wall in the same direction as the direction in which the main body is removed, and It has been found that an integral hinge portion may be formed above the mounting portion of the mounting wall so that the integral hinge portion can be bent and attached to the airbag device. I arrived at the product.

An interior part of an automobile to which an airbag device is assembled includes an interior part main body and a lid portion for an airbag, and a mounting wall connected to the airbag device is formed around a back surface of the lid portion. Car interior parts,
In the case where the die-cutting direction of the interior part main body is a direction crossing the bag pop-out direction, at least one of the front and rear mounting walls of the mounting wall is formed in the same direction as the die-cutting direction of the interior part main part. In addition, an integral hinge portion is formed above the position of the mounting portion of the mounting wall, and the mounting portion of the mounting wall can be bent and fixed to the airbag device by the integral hinge portion. I do.

In the above construction, the interior component main body and the lid are usually integrally formed so that the front surfaces thereof are substantially flush with each other, and the mounting wall forming the integral hinge portion is a rear mounting wall. In some cases, a reinforcing rib whose front edge extends parallel to the front mounting wall from the position of the integral hinge portion of the rear mounting wall is formed in parallel with the die-cutting direction of the interior component main body.

[0013]

The automotive interior part with an airbag lid according to the present invention has the following functions and effects by the above configuration.

At least one of the front and rear mounting walls is
Since the same direction as the mold removal direction of the interior component body is used, one or both of the slide cores conventionally formed on the rear mounting wall on the mold removal direction side are not required, and the mold structure is simplified and the airbag device is simplified. No extra mounting members such as mounting brackets are required.

When the rear mounting wall is set in the same direction as the die-cutting direction of the interior part main body, since the reinforcing ribs are used, no strength problem occurs, and the surface including the rear end of the reinforcing ribs is removed. If it is parallel to the front mounting wall, the airbag does not dive into the gap formed between the rear mounting wall and the back surface of the lid when the airbag device is operated, and the pop-out characteristics (deployment characteristics) of the airbag are reduced. Stabilize.

Accordingly, it is possible to provide an automobile interior part with an airbag lid which can be formed with a simple mold structure, and the productivity of the automobile interior part is improved.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below using an instrument panel as an example. The same parts as those in the related art are denoted by the same reference numerals.

(1) The instrument panel 12 to which the present invention is applied has a configuration as shown in FIGS.

Instrument panel body (hereinafter abbreviated as "body")
14 and lid part for airbag (hereinafter abbreviated as “lid part”) 1
6 is included. The lid 16 has a door 22 defined by a fragile portion B for breaking and a hinge H so that a bag outlet can be formed when the airbag device is operated. A rectangular cylindrical mounting wall 24 is formed around the rear surface of the lid 16 to be connected to the airbag device. The instrument panel 12 has a curved basic cross section, and its die-cutting direction is a direction intersecting with the bag pop-out direction. And, although not inevitable, in the illustrated example, the main body portion 14 and the lid body portion 16 are integrally formed so that the front surfaces thereof are substantially flush. In the illustrated example, the mounting wall 24
Is a rectangular tube, but may be a divided plate.

Here, the main body portion 14 and the lid portion 16 may be formed of the same material, but in the present embodiment, two-color molding is employed to easily respond to the respective required characteristics.

The lid 16 needs to have flexibility and a certain tensile strength in order to secure hinge characteristics. Usually, the lid 16 is made of an olefin-based thermoplastic elastomer (TPE) which is light in weight and has good weather resistance. It is formed with a material exhibiting a breaking stress of 5 to 50 MPa (preferably 5 to 10 MPa). On the other hand, the main body portion 14 is formed of a plastic material containing a reinforcing filler such as fiber reinforced PP and has a flexural modulus of 2000 MPa or more in order to ensure shape retention and high temperature resistance.

When the main body portion 14 and the lid portion 16 are formed of the same material, the main body portion 14 and the lid portion 16 are made of the above-mentioned thermoplastic elastomer (TPE) such as an olefin resin and have a tensile breaking stress of 600 to 600.
It is formed with a material showing 800 MPa.

(2) In the above configuration, in the instrument panel 12 to which the present embodiment is applied, the front and rear mounting walls 24 of the mounting wall 24 are provided.
a, 24b, the rear mounting wall 24b is an oblique wall in the same direction as the die-cutting direction, and the integral hinge portion 25 is located above the position of the mounting portion 23 of the rear mounting wall 24b.
Is formed, and the mounting portion of the mounting wall can be bent and fixed to the airbag device 58, that is, the airbag cover 60 by the integral hinge portion 25. The integral hinge portion 25 is formed by a groove 25a.
In the illustrated example, the groove 25a for forming the integral hinge portion 25 is formed outside the rear mounting wall 24b, but may be inside or both inside and outside. The cross-sectional shape of the groove 25a is triangular in the illustrated example, but is U-shaped.
Any shape such as a semicircular shape and a trapezoidal shape is possible. Although the depth of the groove depends on the material of the molding material and the thickness of the mounting wall, it is sufficient that the groove can be bent at the portion (there may be a linear elastic return). In the case of an olefin-based TPE, the depth is usually 0.5 to 1.5 mm. Within this range, the molded product can be forcibly removed from the mold.

The front mounting wall 24a may also be formed as an oblique wall in the same direction as the die-cutting direction, and an integral hinge portion may be formed on the base side. Left and right mounting walls 24c, 24c
Is an upright wall.

In the above, the integral hinge 25
Is formed by the groove 25a, but is not limited to this configuration as long as the bend is positively generated at the portion. For example, it is optional to reduce the thickness below the hinge portion or to form a reinforcing rib from above to the hinge portion.

Also, assuming that it is difficult for the rear mounting wall 24b to obtain a sufficient strength, and from the viewpoint of guiding the direction in which the airbag pops out, the position of the integral hinge portion 25 of the rear mounting wall 24b and the front mounting wall 24a are different from each other. A plurality of planar triangular reinforcing ribs 26 whose front edges extend in parallel are formed in parallel with the die-cutting direction of the instrument panel main body (interior product main body) 14 (see FIG. 5).

(3) Although not indispensable, from the viewpoint of improving the design, a design surface forming sheet (hereinafter abbreviated as “design sheet”) 2 which forms a skin layer from the lid 16 to the main body 14 is formed.
0 is insert molded. The specific structure (not shown) of the design sheet 20 is usually a skin layer formed of soft vinyl chloride or olefin-based TPE which is disposed on the front side and has a good touch, and a foamed polypropylene disposed on the back side of the skin layer. And the like, and a barrier layer formed of a styrene-based TPE or an olefin-based TPE disposed on the back side of the cushion layer, and has a two-layer structure of a skin layer and a cushion layer. Alternatively, a single-layer structure of only the skin layer may be employed.

(4) A method of manufacturing the instrument panel 12 having the above configuration will be described (FIG. 6).

(A) The design sheet 20 previously formed into a predetermined shape by vacuum forming is set on the fixed mold 38 of the mold 36 and then clamped. That is, the movable mold 40 is moved in the white arrow direction with respect to the
And a slide core 34 for material separation.
a and 34b are advanced (the state of the figure).

Here, a case will be described as an example in which slide cores 34a and 34b for separating the molding material of the main body 14 and the lid body 16 are provided. However, the slide core is not inevitable, and the undercut is not necessarily performed. It is essentially different from the release slide core for escape. That is, the slide core for material punching is small in the amount of movement only by the thickness of the main body base layer 18 and is usually uniform over the entire circumference, and is a cylindrical slide core. The slide core is separate before and after, and the amount of movement is relatively large due to the need for the undercut.

The movable mold 40 is provided with a first gate 44 for molding the lid and second, third and fourth gates 46, 48 and 50 for molding the main body. Also,
A release slide core 56 is attached to the inside of the mounting cavity 42a of the fixed front mounting wall 24a so as to be releaseable. In the rear slide core 34b of the material-distributing slide cores 34a and 34b, a ridge 34c for forming (adding) the integral hinge portion 25 on the rear mounting wall 24b in the retracted state is formed. I have.

(B) The first thermoplastic resin material (TPE) is injected into the mold 36 and the product cavity 42 through the first gate 44, and the lid 16 is injection-molded. (For example, after 30 seconds), the second thermoplastic resin material (reinforcement) that can be thermally fused to the first thermoplastic resin material in the cavity 42 via the second, third, and fourth gates 46, 48, 50 The main body portion 14 is injection-molded by injecting an olefin resin containing a conductive filler.

(C) Immediately before the injection of the main body 14 is completed, the material-distributing slide cores 34a and 34b are retracted. Then, at that time, the main body 14 and the lid 16
Are both uncured, so they are heat-sealed and integrated,
The ridge 34 of the slide core 34b for material separation on the rear side
By (c), a groove 25a is formed in the rear mounting wall 24 to form the integral hinge portion 25.

(D) After the main body 14 is cured, it is released from the mold. In this case, the release slide core 56 is retracted to a position where it does not interfere with the rear mounting wall 24b. It is only necessary to operate one release slide core 56 at the time of release, and the mold structure and operation are simplified.

After releasing the molded product, the gate portion is removed.

Then, each mounting wall 24 is pressed by a press or the like.
a, 24b, 24c respectively include a plurality of first, second,
Third engagement holes 28, 30, 32 are formed.

(5) The instrument panel 12 thus manufactured is attached so that the lid 16 is located above the airbag device 58 as described below. The airbag device 58
The air bag 62 is placed in the bag case 60 having the top opening.
An airbag module including an inflator 64 and a diffuser 66 is screwed via a flange 66a of the diffuser 66.

The airbag device 58 is mounted via an airbag case 60 to a reinforcing bracket 70 fixed by a reinforcing pipe 68 on the vehicle body side.

Each of the support walls 60a, 60b, 60c of the upper receiving portion of the bag case 60 has a respective mounting wall 24.
a, 24b, 24c are formed to be able to support the first, second, and third engaging claws 72, 74, 76, and
The first and second receiving pieces 78, 8 are provided on the rear mounting walls 24a, 24b.
0 is formed to form a partially double structure.

Thus, the mounting wall 24 of the instrument panel 12 is
By forcibly fitting along the inside of the support wall portions 60a, 60b, 60c of the bag case 60, the first, second, and
The third engagement pawls 72, 74, 76 are engaged with the first, second, and third engagement holes 28, 30, 32, respectively, to hold the instrument panel 12 on the vehicle body near the lid 16. . The other part of the instrument panel 12 is fixed to a mounting bracket or the like (not shown) from the vehicle body by screws or the like.

When the instrument panel 12 is mounted on a vehicle, predetermined instruments and the like are provided.

At a predetermined time, if gas is discharged from the inflator 64, the gas flows into the airbag 62 through the diffuser 66 gas flow holes, and
Breaks the fragile portion B for breaking, opens the door portion 22 about the hinge portion H as the center of rotation, and expands greatly. At this time, since the rear end edge of the reinforcing rib is parallel to the front mounting wall 24a, there is no possibility that the airbag 62 flows between the rear mounting wall 24b and the back surface of the lid, and the deployability of the airbag is reduced. Can be secured.

In this embodiment, the instrument panel has been described. However, it is also possible to apply an automobile interior component such as a door trim and a seat back disposed to cover an airbag of an airbag device other than the instrument panel.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a mold showing a method for manufacturing a conventional instrument panel.

FIG. 2 is a perspective view showing an instrument panel assembling mode to which the present invention is applied.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is an enlarged sectional view of a molded product at a rear mounting wall portion in FIG. 3;

FIG. 5 is an inverted perspective view of only the mounting wall of the instrument panel cover.

FIG. 6 is a schematic cross-sectional view showing a state after mold clamping in the method of manufacturing an instrument panel.

[Explanation of symbols]

 12: instrument panel (instrument panel), 14: (instrument panel) body, 16: lid (for airbag), 20: design sheet 22: door, 23: mounting part of rear mounting wall 24: mounting wall, 25: Integral hinge portion of rear mounting wall 24a: Front mounting wall, 24b: Rear mounting wall, 36: Mold, 42: Molded product cavity, 58: Airbag device, 62: Airbag device, H: Hinge portion,

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B29C 45/14 B29C 45/14 B29L 31:58 B29L 31:58 (72) Inventor Yuji Kuriyama Nishi, Aichi No. 1, Nagahata, Kasuga-machi, Kasuga-cho, Toyoda Gosei Co., Ltd. (72) Inventor Kensuke Suzuki No. 1, Nagata, Kasuga-cho, Nishi-Kasugai-gun, Aichi, Japan Toyoda Gosei Co., Ltd. (72) Inventor Hikaru Ando, Nishi-Kasugai-gun, Aichi Prefecture 1 Kasugamachi Ochiai Ogai Nagahata Toyoda Gosei Co., Ltd. F-term (reference) 3D044 BA11 BB01 BC02 BC07 3D054 AA14 BB09 FF17 FF20 4F202 AA03 AA45 AB25 AD08 AD20 AG03 AH23 AH25 CA11 CB01 CB12 CB21 AD03 A45A20 AH23 AH25 JA07 JB12 JB21 JN12 JN25 JQ81

Claims (3)

[Claims] 1. An interior part of an automobile to which an airbag device is assembled, the interior part including an interior part main body and a lid part for an airbag, and an attachment connected to the airbag apparatus around a back surface of the lid part. In an automobile interior component having a wall formed therein, wherein the direction of cutting off the interior component main body portion is a direction intersecting with a bag pop-out direction, at least one of front and rear mounting walls of the mounting wall, An integral hinge portion is formed above the position of the mounting portion of the mounting wall, and the mounting portion of the mounting wall is bent by the integral hinge portion in the airbag device. Interior parts with lids for airbags, characterized in that they can be fixed. 2. The automobile interior part with an airbag lid according to claim 1, wherein the interior part main body and the lid part are integrally formed so that the front surface side is substantially flush. . 3. The mounting wall is a rear mounting wall,
The reinforcing rib having a front edge extending in parallel with the front mounting wall from a position of an integral hinge portion of the rear mounting wall is formed in parallel with a die-cutting direction of the interior component main body. Or an automobile interior part with an airbag lid according to 2.