JP2007145211A - Vehicle airbag door structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To certainly rupture a rupturing line of a skin by a smaller load. <P>SOLUTION: This vehicle airbag door structure has a foaming layer 8 between a door member 6 and a skin 7, the door member 6 has a surface part 12 having a door part 11 to be opened by an airbag body 5 and a mounting leg part extended to surround the door part 11 from the back surface side of the surface part 12 and free to engage an air bag module 4 to bulge the airbag body 5, the skin 7 has a rupturing part 14 linearly extending roughly along a head end edge 15 at least roughly above the head end edge 15 of the door part 11, an extended part 26 to extend to a position above a circular arc 25 passing through the rupturing part 14 with a base end part 17 of the door part 11 as its revolving center is provided at least on a part of the head end edge 15 of the door part 11, and a rib 28 a head end of which is pointed and free to directly hit the rupturing part 14 is provided on this extended part 26. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle airbag door structure.

  A vehicle such as an automobile is provided with an instrument panel 1 as shown in FIG. And the airbag apparatus 2 is provided in the part by the side of the passenger seat of this instrument panel 1 (for example, refer patent document 1). The airbag device 2 includes an airbag door 3 provided on the instrument panel 1 and an airbag module 4 provided on the inner side of the airbag door 3. The airbag module 4 is configured to inflate the airbag body 5 with high-pressure gas or the like.

  The airbag door 3 described above includes one formed integrally with the instrument panel 1 and one provided separately from the instrument panel 1, but is formed integrally with the instrument panel 1. For example, there is one having a multilayer structure (in this case, a three-layer structure) having at least a foam layer 8 between the door member 6 and the skin 7. That is, an opening 10 is formed in the core material 9 with respect to the instrument panel 1 having a multilayer structure (three-layer structure) having the foam layer 8 between the core material 9 and the skin 7, and a door member is formed in the opening 10. By foam-molding the instrument panel 1 with the 6 attached, the airbag door 3 having a three-layer structure integrated with the instrument panel 1 is obtained. The door member 6 is fastened to the peripheral portion of the opening 10 by vibration welding or claw fitting.

  The door member 6 is extended so as to surround the door portion 11 from the back surface side of the surface portion 12 and the surface portion 12 having the door portion 11 opened by the airbag main body 5, thereby engaging the airbag module 4. It has the attachment leg part 13 which can be stopped. Here, the door portion 11 is defined by a cleaving portion 14 formed on the back surface side of the surface portion 12. The cleaving portion 14 has, for example, a groove shape or a stitch shape, and is set by mold formation or laser processing. In addition, the door portion 11 includes a single-open door and a double-open door. In the case of a single sheet opening, the cleavage portion 14 is substantially U-shaped or O-shaped in plan view. In the case of two-sheet opening, the cleavage portion 14 is substantially H-shaped or day-shaped in plan view. The front end edge 15 of the door portion 11 is usually extended substantially linearly in the vehicle width direction, and the cleavage portion 14 also has a corresponding straight portion (lateral cleavage line portion 16). ing.

  Moreover, the door part 11 becomes the rotation center when the base end part 17 opens. And the attachment leg part 13 is extended toward the substantially bulging direction of the airbag main body 5. As shown in FIG. The airbag module 4 is locked and held in a floating state via the hook 18 on the mounting leg 13.

The skin 7 has a tear line 19 that extends in a straight line substantially along the front edge 15 at least substantially above the front edge 15 of the door portion 11. The tear line 19 is formed in advance on the back side of the skin 7 by laser processing or the like before the instrument panel 1 is molded.
JP2004-243594

  However, in the airbag door 3 having the above-described multilayer structure (three-layer structure), the foamed layer 8 has a required thickness, so that the leading edge 15 rotates around the base end portion 17 of the door portion 11 when opened. There is a problem that the locus deviates from the position of the tear line 19 of the skin 7 and the leading edge 15 of the door portion 11 does not directly hit the tear line 19 of the skin 7.

  For this reason, the cleavage line 19 of the skin 7 is cleaved only by the tensile force acting on the skin 7, and accordingly, a large load is required for the cleavage. Thus, when a large load is required for the cleavage of the cleavage line 19 of the skin 7, there are problems that design restrictions increase and the required performance for the processing unit of the cleavage portion 14 increases.

  In order to solve the above-described problem, in the invention described in claim 1, a foam layer is provided between the door member and the skin, and the door member includes a surface portion having a door portion opened by the airbag main body. And an attachment leg portion that extends from the rear surface side of the surface portion so as to surround the door portion and can lock the airbag module that inflates the airbag body, and the skin is at least the door portion. In a vehicle airbag door structure having a tear line extending substantially linearly along the tip edge substantially above the tip edge of the door portion, a base end portion of the door portion is provided on at least a part of the tip edge of the door portion. It is characterized by a vehicle airbag door structure in which an extension portion extending to a position on an arc passing through the tear line as a rotation center is provided, and a rib having a pointed tip that can directly hit the tear line is provided in the extension portion.

  According to the invention of claim 1, at least a part of the distal end edge of the door portion is provided with an extension portion that extends to a position on an arc passing through the cleavage line with the base end portion of the door portion as a rotation center, By providing a rib with a sharp tip that can hit the cleavage line directly, the sharp tip of the rib that extends to at least a part of the edge of the door part directly hits the cleavage line of the epidermis when the door is opened Makes it possible to cleave the epidermal cleavage line using shearing force in addition to the tensile force acting on the epidermis, so that the epidermal cleavage line can be reliably cleaved with a smaller load. It becomes. As a result, the degree of freedom in design can be improved, and the required performance for the processing unit of the cleavage line can be lowered.

  The purpose of ensuring that the tear line of the epidermis can be reliably cleaved with a smaller load is provided on at least a part of the front edge of the door part on an arc passing through the cleavage line with the base end part of the door part as the center of rotation. This is realized by means of providing an extension extending to the position and providing a rib with a sharp tip that can directly hit the cleavage line in the extension.

  Hereinafter, embodiments embodying the present invention will be described together with illustrated examples.

  1 and 2 show an embodiment of the present invention. Note that the configuration of the instrument panel 1, the airbag device 2, the airbag door 3, etc. is basically the same as that of FIG. 8, so this drawing will be referred to as necessary and this embodiment will be described. It can be an example description.

  First, the basic configuration necessary for the description of this embodiment will be described. The airbag door 3 according to this embodiment has a foam layer 8 between the door member 6 and the skin 7.

  And the door member 6 is extended so that the door part 11 may be enclosed from the surface part 12 which has the door part 11 opened by the airbag main body 5, and the back surface side of the surface part 12, and the airbag main body 5 is expanded. It has the attachment leg part 13 which can latch the airbag module 4. As shown in FIG. In this case, the door portion 11 is opened in two by a substantially H-shaped cleavage portion 14 in plan view. The substantially H-shaped cleavage portion 14 in plan view has a lateral cleavage line portion 16 and a longitudinal cleavage line portion 20 extending from the lateral cleavage line portion 16 toward both sides in the vehicle longitudinal direction.

  The skin 7 has a cleavage line 19 extending substantially linearly along the front edge 15 at least substantially above the front edge 15 of the door portion 11.

  In this embodiment with respect to the above configuration, at least a part of the distal end edge 15 of the door portion 11 extends to a position on the arc 25 passing through the cleaving portion 14 with the base end portion 17 of the door portion 11 as a rotation center. An extension 26 is provided.

  In the case of the door portion 11 having two doors, since the leading edges 15 are in abutment state, if the extension 26 is provided on the leading edge 15 of one door portion 11, the leading edge of the other door portion 11 is provided. The corresponding part of 15 becomes the lead-in part 27. In addition, this causes the position of the cleavage line 19 of the skin 7 to deviate from the position immediately above the surface by the extension portion 26 and the retracting portion 27.

  And the rib 28 with the pointed tip which can hit the cleavage part 14 directly is provided in the upper part of this extension part 26. As shown in FIG. The rib 28 is preferably a triangular rib. Normally, the door member 6 is formed of a soft material such as an elastomer. However, since the rib 28 is preferably hard in terms of function, if necessary, the rib 28 and its peripheral portion (the door portion 11). A part of the surface can be made of a hard material 29 such as a PP material. The hard material 29 is formed by, for example, two-color molding. In addition, the cleavage part 14 shall reach even a part of the hard material 29 in order to improve tearability.

  1 and 2, the rib 28 is provided over the entire front end edge 15 of the one door portion 11, but the rib 28 is formed in FIGS. 2 to 4 (see FIG. 2 for the above description). As shown in FIG. 5 to FIG. 7, the rib 28 may be partially provided with respect to the central portion of the leading edge 15 of the one door portion 11. Moreover, you may make it provide partially with respect to the position where the front-end edge 15 of both the door parts 11 differs. When the rib 28 is partially provided as shown in FIGS. 3 to 7, the lateral cleavage line 16 is bent at the end of the rib 28. However, in any case, the cleavage line 19 of the epidermis 7 is also linear.

  Next, the operation of this embodiment will be described.

  The airbag device 2 for the passenger seat is folded and accommodated in an airbag module 4 disposed inside the instrument panel 1 when an impact load of a predetermined value or more is applied to the vehicle body. However, it is deployed by the supply of high-pressure gas from the inflator, opens the airbag door 3 provided on the instrument panel 1 and inflates toward the passenger in the passenger compartment, receives the passenger in the passenger seat, and enters the instrument panel 1 and the like. Restraint protection to avoid the next collision. In this embodiment, at least a part of the front end edge 15 of the door portion 11 is provided with an extension portion 26 extending to a position on an arc 25 passing through the cleaving portion 14 with the base end portion 17 of the door portion 11 as a rotation center. By providing the portion 26 with a pointed rib 28 capable of directly hitting the cleaving portion 14, the rib 28 formed to extend to at least a part of the end edge 15 of the door portion 11 when the door portion 11 is opened. Since the tip directly hits the tear line 19 of the epidermis 7, it becomes possible to cleave the tear line 19 of the epidermis 7 using a shearing force in addition to the tensile force acting on the epidermis 7. The tear line 19 of the skin 7 can be reliably cleaved with a small load.

  As a result, the degree of freedom in design can be improved, and the required performance of the cleavage unit 14 for the processing unit can be reduced.

  Further, the rib 28 protruding to the foam layer 8 side also has a function of reducing a side slip between the door portion 11, the foam layer 8 and the skin 7, so that the above-described tensile force and shear force can be utilized more effectively. can do.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are only examples of the present invention, and the present invention is not limited to the configurations of the embodiments. Needless to say, design changes and the like within a range not departing from the gist of the invention are included in the present invention. Further, when a plurality of embodiments and modifications are shown, it is a matter of course that these possible combinations are included.

It is a perspective view of the door member concerning the Example of this invention. It is sectional drawing along the AA line of FIG. 1 and FIG. It is a perspective view of the door member concerning the modification of FIG. It is sectional drawing along the BB line of FIG. It is a perspective view of the door member concerning the other modification of FIG. It is sectional drawing along CC line of FIG. It is sectional drawing along the DD line of FIG. It is side sectional drawing of a prior art example.

Explanation of symbols

4 Airbag Module 5 Airbag Body 6 Door Member 7 Skin 8 Foam Layer 11 Door Part 12 Surface Part 13 Mounting Leg Part 14 Cleavage Part 15 Tip Edge 17 Base End Part 25 Arc 26 Extension Part 28 Rib

Claims (1)

Having a foam layer between the door member and the skin,
The door member has a surface portion having a door portion that is opened by the airbag body, and an airbag module that extends from the back surface side of the surface portion to surround the door portion to inflate the airbag body. With possible mounting legs,
In the vehicle airbag door structure, wherein the skin has a tear line extending substantially linearly along the tip edge at least substantially above the tip edge of the door portion,
At least a part of the front end edge of the door portion is provided with an extension portion extending to a position on an arc passing through the cleavage line with the base end portion of the door portion as a rotation center,
A vehicular airbag door structure characterized in that a rib having a pointed tip capable of directly hitting a cleavage line is provided in the extension portion.

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