JP2015024783A - Structure of airbag door part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a stable deployment behavior of an airbag by receiving a load applied to an airbag door part by a high-rigidity part at the expansion and deployment of the airbag firstly, by absorbing the load of an amount which flows up to a low-rigidity part by the elongation of the low-rigidity part to a deployment direction of an airbag door, and by suppressing the generation of fracture at a member change region, and to suppress the deterioration of external appearance by absorbing thermal deformation caused by an in-cabin environment by the low-rigidity part.SOLUTION: In a structure of an airbag door part 1 which is arranged in a cabin R, and different from an instrument panel 2 in a peripheral region in material quality, a high-rigidity part reinforcing wall 14 and a low-rigidity part notch 15 are formed between an airbag opening fracture part 12 formed at the airbag door 11 and a member change region 13 located at a periphery of the airbag operation fracture part 12, the reinforcing wall 14 is formed at the airbag opening fracture part 12 side, and the notch 15 is formed at the member change region 13 side.

Description

  The present invention relates to a structure of an airbag door portion installed on an instrument panel such as an automobile.

  Conventionally, an airbag device has been installed on the back side of the upper surface portion of an instrument panel located in front of a passenger seat of an automobile or the like, and the airbag device is folded at a predetermined portion inside the instrument panel. An airbag that is stored in a state of being stored is provided. When the stored airbag is supplied with gas, the airbag is inflated and deployed toward the occupant side in order to protect the occupant seated in the passenger seat in the passenger compartment from an impact load. Therefore, an air bag door portion is provided on the upper surface portion of the instrument panel so that the air bag can be inflated and deployed in the vehicle interior.

  As shown in FIG. 9, such an airbag door portion 50 includes a portion of an instrument panel 51 and includes an airbag door 53 in which an airbag cleaving portion 52 is formed at a central position. Around the bag door 53, a high-strength reinforcing wall 54 extending from the back side of the instrument panel 51 toward the vehicle lower side is provided. The airbag door portion 50, particularly the airbag door 53, is formed using a material that is different from the material of the instrument panel 51 in the peripheral portion.

By the way, in parts of automobiles, a joint portion between members of different materials is known as a portion where breakage easily occurs due to an impact load. In particular, when a sudden impact load from an air bag or the like is received, the load may propagate through the member and concentrate on the joint portion, which may lead to breakage of the joint portion. If the breakage of the joint portion reaches the peripheral portion of the member, the member of the airbag door portion different from the airbag is scattered from the broken periphery.
Therefore, in the structure of the conventional airbag door portion, a fragile portion is provided at the joint portion between the airbag door and the peripheral instrument panel, and the fragile portion is expanded when the airbag is inflated and deployed in the vehicle interior. The airbag door is configured to open from the base point (see, for example, Patent Document 1).

JP 2002-225663 A

  However, in the structure of the conventional airbag door portion described above, the weak portion is merely provided at the joint portion between the airbag door and the instrument panel made of different materials. When the impact load is concentrated on the portion, the portion of the fragile portion is broken, and there is a possibility that the fragments are scattered on the vehicle interior side.

  The present invention has been made in view of such a situation, and its purpose is to receive the load received by the airbag door part at the time of inflation and deployment of the airbag at the high-strength part and flow to the low-strength part. The load is absorbed by the extension of the low-strength part in the direction of deployment of the airbag door, it is possible to suppress the occurrence of breakage at the site where the member is changed, and to ensure a stable deployment behavior of the airbag and to prevent thermal deformation due to the vehicle interior environment. An object of the present invention is to provide a structure of an airbag door portion that can suppress a decrease in appearance from being absorbed by absorption at a low strength portion.

  In order to solve the above-described problems of the prior art, the present invention is an airbag door portion formed in an airbag door in a structure of an airbag door portion that is installed in a vehicle interior and is made of a material different from that of a peripheral portion. A high-strength portion and a low-strength portion are provided between the member changing site located around the airbag-cleaving portion, and the high-strength portion is disposed on the airbag-cleaving portion side, and the low-strength portion Is arranged on the member changing part side.

Moreover, in this invention, the said high intensity | strength part and the said low intensity | strength part are located in the outer side of the said airbag cleaving part, and have a side part in four directions of front and rear, right and left of the said airbag cleaving part.
Furthermore, in the present invention, the high-strength portion and the low-strength portion are formed in a shape that can cover the entire circumference of the airbag tearing portion.

And in this invention, the said low intensity | strength part which covers the perimeter of the said airbag tearing part is formed in the wave shape which gave the width | variety the distance from the said airbag tearing part.
In the present invention, the low-strength portion is formed by a notch having an inclined surface whose thickness changes on the airbag tearing portion side and the member change site side, and the airbag tearing portion of the notch The surface on the side is set to a gentle slope surface, and the surface on the member changing part side of the notch is set to be a steep slope surface compared to the airbag tearing portion side.
Furthermore, in the present invention, the low-strength portion is disposed with a certain distance from the high-strength portion, and is shorter than one half of the shortest distance between the member change site and the high-strength portion. It is provided on the high strength part side at a distance.

As described above, the structure of the airbag door portion according to the present invention is the airbag door portion that is installed in the vehicle interior and is made of a material different from that of the peripheral portion. A high-strength part and a low-strength part are provided between the member change site located around the bag-cleavage part, the high-strength part is disposed on the airbag-cleavage part side, and the low-strength part is Since it is arranged on the side where the member is changed, the load received by the airbag door when the airbag is inflated and deployed is first received by the high-strength portion, and the load that cannot be received by the high-strength portion flows to the low-strength portion. In the low-strength part, the load is absorbed by the low-strength part extending in the deployment direction of the airbag door in accordance with the movement of the deployed airbag door. Change part The occurrence of fracture at can be suppressed. Therefore, according to the structure of the airbag door portion of the present invention, it is possible to prevent the members from being scattered at the airbag door portion accompanying the inflation and deployment of the airbag, and the safety of the occupant can be improved.
Further, in the structure of the airbag door portion according to the present invention, the load associated with the inflation and deployment of the airbag is first received by the high-strength portion. A stable deployment behavior of the bag can be ensured. Furthermore, during normal driving of the car, especially when it is hot in summer, the cabin temperature rises and the low-strength part expands and contracts even if the airbag door part, which is often made of resin material, is thermally deformed. The said thermal deformation can be absorbed, it can prevent that an airbag door part swells or dents, and it can suppress that the external appearance of an airbag door part deteriorates. In addition, since the high-strength portion is provided side by side, the surface rigidity of the airbag door portion itself can be improved, and there is no occurrence of a dent even if an object is placed on the airbag door portion.

  Further, in the present invention, the high-strength portion and the low-strength portion are located outside the airbag cleaving portion and have side portions in four directions, front, rear, left, and right of the airbag cleaving portion. Therefore, it is possible to reliably suppress the propagation of the deployment load to the intermediate portion of the member changing portion that causes the above-described factors, and finally, the scattering of the member of the airbag door portion can be suppressed.

  Furthermore, in the present invention, since the high-strength portion and the low-strength portion are formed in a shape that can cover the entire circumference of the airbag tearing portion, the load concentration point to the low-strength portion is eliminated, The deployment load of the airbag can be absorbed with a good balance between the high strength portion and the low strength portion. In addition, since the high-strength portion makes one round with respect to the airbag tearing portion, it will be reinforced in a shape close to a box shape, and the airbag door will be used during both normal running and airbag inflation / deployment. High strength to the part can be exhibited.

  And in this invention, since the said low intensity | strength part which covers the perimeter of the said airbag tearing part is formed in the wave shape which gave the width | variety the distance from the said airbag tearing part, it is large in a low strength part. Even when the load flows, it becomes possible to absorb the load by the expansion and contraction caused by the wave-shaped low-strength part, and it is possible to suppress the occurrence of scattering due to the concentration of the deployment load on the low-strength part. The deployment behavior of the airbag can be stabilized.

  In the present invention, the low-strength portion is formed by a notch having an inclined surface whose thickness changes on the airbag tearing portion side and the member change site side, and the airbag tearing portion of the notch The surface on the side is set to a gentle slope surface, and the surface on the member change site side of the notch is set to a steeper surface compared to the airbag tear portion side, so the airbag tear portion side is The plate thickness is an inclined surface that gradually changes toward the member change site side, and it is possible to promote the occurrence of elongation rather than breakage, and on the member change site side, the steep inclined surface is a standing wall for load propagation As a result, it can be clarified that the minimum thickness portion is the starting point of elongation.

  Furthermore, in the present invention, the low-strength portion is disposed with a certain distance from the high-strength portion, and is shorter than one half of the shortest distance between the member change site and the high-strength portion. Since it is provided on the high strength part side at a distance, even if the low strength part is too close to the high strength part or too far from the part change part, the elongation does not occur, and the occurrence of elongation in the low strength part is promoted. Can be made.

It is the perspective view which looked at the instrument panel of the motor vehicle to which the structure of the airbag door part which concerns on embodiment of this invention is applied from the diagonally upper direction by the side of a vehicle interior. It is the perspective view which looked at the air bag door part of the embodiment of the present invention from the back side of the instrument panel. It is the front view seen from the arrow X direction in FIG. FIG. 4 is a cross-sectional view taken along line YY in FIG. 3 and shows a state before the airbag door is cleaved. It is sectional drawing which expands and shows the Z section in FIG. FIG. 4 is a cross-sectional view taken along line YY in FIG. 3 and shows a state immediately after the airbag door is cleaved. FIG. 4 is a cross-sectional view taken along line YY in FIG. 3, showing a state in which the airbag door is cleaved and pushed out from a low strength portion (fragile portion) as a base point. The structure of the airbag door part which concerns on other embodiment of this invention is shown, and it is the front view seen from the arrow X direction in FIG. It is the front view which looked at the conventional airbag door part from the back surface side of the instrument panel.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
FIGS. 1-7 shows the structure of the airbag door part which concerns on embodiment of this invention.

  As shown in FIGS. 1 and 2, the airbag door portion 1 having the structure of the present embodiment is an upper surface of an instrument panel 2 of a large resin part located in front of a passenger seat where an occupant sits in a vehicle interior R of an automobile. The airbag of the airbag device 3 installed on the back surface 2b side of the instrument panel 2 is provided so as to be inflated and deployed toward the vehicle interior R side. Therefore, the airbag device 3 includes a box-shaped airbag case 31 attached to the back surface 2b side of the upper surface portion 2a of the instrument panel 2 corresponding to the position of the airbag door portion 1, and a bottom portion of the airbag case 31. The inflator 32 is fixed to the upper part of the inflator 32 and the upper part of the inflator 32 is stored in a folded state in the outer periphery of the inflator 32 in the airbag case 31. When gas is supplied from the inflator 32, the inflator 32 is inflated and deployed to the occupant side. And a bag airbag (not shown) that protects the passenger from impact loads.

  As shown in FIGS. 1 to 5, the airbag door portion 1 of the present embodiment includes a rectangular airbag door 11 that constitutes a part of the upper surface portion 2 a of the instrument panel 2. An airbag cleaving portion 12 extending in the vehicle width direction is formed at the center position of the door 11 in the vehicle front-rear direction. The airbag door portion 1, particularly the airbag door 11, is formed using a material that is different from the peripheral instrument panel 2. That is, in the structure of the present embodiment, only the airbag door portion 1 is constituted by the two-color resin-integrated instrument panel 2 made of a resin material having excellent viscosity and extensibility. And the member change site | part 13 is formed in the boundary line of the airbag door part 1 and the instrument panel 2 from which a material mutually differs.

Moreover, in the airbag door part 1 of this embodiment, between the airbag cleavage part 12 of the airbag door 11, and the member change site | part 13 located in the periphery of this airbag cleavage part 12, FIG. As shown in FIG. 4, a high-strength portion reinforcing wall 14 and a low-strength portion (fragile portion) notch 15 are provided, and the reinforcing wall 14 extends from the back surface 2 b side of the instrument panel 2 to the airbag case 31. The vehicle extends downward to the top of the outer peripheral surface.
The reinforcing wall 14 is disposed on the inner airbag tearing portion 12 side, and the notch 15 is disposed on the outer member changing portion 13 side. In addition, the reinforcing wall 14 and the notch 15 are located outside the airbag tearing portion 12, have side portions in four directions on the front, rear, left and right of the airbag tearing portion 12, and all of the airbag tearing portion 12. It is formed in a shape that can cover the circumference (in this embodiment, an annular quadrilateral whose four corners are arcs).

By such arrangement and shape of the reinforcing wall 14 and the notch 15, the propagation of the airbag deployment load to the intermediate portion of the member changing portion 13 that causes the breakage is suppressed, and scattering of the members of the airbag door portion 1 is prevented. It will be suppressed. In the process leading to the scattering of the member of the airbag door part 1 due to the breakage of the member changing part 13, the breakage of the intermediate part occurs first, and the breakage propagates to the end part, and the breakage from other directions By merging with propagation, the member itself is scattered. In contrast, in the structure of the airbag door portion 1 according to the present embodiment, the intermediate portion of the member changing portion 13 is provided with a structure that suppresses the propagation of the airbag deployment load. It is possible to suppress this, and ultimately to prevent the members from scattering.
Further, the airbag deployment load concentration point on the notch 15 which is the low strength portion is eliminated, and the deployment load of the airbag is absorbed in a balanced manner by the reinforcing wall 14 of the high strength portion and the notch 15 of the low strength portion. It will be. Furthermore, the periphery of the airbag cleaving portion 12 is reinforced by a substantially box-shaped reinforcing wall 14, and the strength of the reinforcing wall 14 is exhibited both during normal travel and when the airbag is inflated and deployed. Even if breakage occurs at the end of the member changing portion 13, the intermediate side portions of the reinforcing wall 14 and the notch 15 are connected to each other so that the members are not scattered.

  Further, the notch 15 of the present embodiment cuts a part of the airbag door portion 1 so as to have an inclined surface whose thickness changes between the inner side of the airbag tearing portion 12 side and the outer side of the member changing portion 13 side. It is formed by lacking. In addition, as shown in FIG. 5, the notch 15 has an inclined surface 15a on the airbag tearing portion 12 side set to a gently inclined surface with a large angle, and an inclined surface 15b on the member change site 13 side has an airbag. It is set to a steeply inclined surface with a small angle as compared with the inclined surface 15a on the cleaving portion 12 side. Therefore, the inclined surface 15a on the airbag tearing portion 12 side becomes an inclined surface in which the plate thickness gradually changes toward the member changing portion side, and not the breakage but the elongation is promoted, and the inclined surface 15b on the member changing portion 13 side is an air It becomes an inclined surface that functions as a standing wall for propagation of the bag deployment load, and it is clarified that the minimum thickness portion is the starting point of elongation.

  Further, as shown in FIGS. 3 and 4, the notch 15 of the present embodiment has a certain distance from the reinforcing wall 14 and is disposed with a space from the reinforcing wall 14. And it is provided in the reinforcement wall 14 side by the distance L2 shorter than the shortest distance L1 of the member change part 13 and the reinforcement wall 14. FIG. With such a positional relationship, the cutout 15 does not get too close to the reinforcing wall 14 or is not too far from the member changing portion 13, and the occurrence of elongation at the cutout 15 portion is promoted. In order to generate low-strength elongation in accordance with the deployment behavior of the airbag door 11 in the notch 15 in the low-strength portion, the notch 15 must be provided at a certain distance from the reinforcing wall 14 in the high-strength portion. This is because it is necessary to be closer to the reinforcing wall 14 side than the member changing portion 13. This is because the three effects of force must be spaced apart in order to cause elongation at the notch 15 portion.

  In the airbag door portion 1 according to the embodiment of the present invention configured as described above, the inflator 32 of the airbag apparatus 3 is actuated when the automobile receives an impact, so that the inflation gas is introduced into the folded airbag. When the air flows in, the air bag tends to inflate and deploy from the upper surface portion 2a of the instrument panel 2 toward the passenger seated in the passenger seat. Accordingly, the deployment energy from the airbag acts on the airbag door 11 in the state of FIG. 4 as indicated by arrow F in FIG. The airbag door 11 pivots and opens toward the upper side of the vehicle with reference to 14a. Then, as shown in FIG. 7, the airbag door 11 is further rotated upwardly from the notch 15 by the deployment energy from the airbag and is fully opened. As a result, the airbag of the airbag device 3 can be inflated and deployed toward the passenger in the vehicle interior R.

  As described above, in the structure of the airbag door portion 1 according to the embodiment of the present invention, the airbag door portion 1 and the instrument panel 2 in the peripheral portion are different from each other, and the airbag rupture formed on the airbag door 11 is broken. A reinforcing wall 14 of a high strength portion and a notch 15 of a low strength portion are provided between the portion 12 and a member changing portion 13 located around the airbag tearing portion 12, and the reinforcing wall 14 is an airbag tearing portion. Since the notch 15 is disposed on the member changing portion 13 side, the deployment load (deployment energy) received by the airbag door portion 1 when the airbag device 3 is inflated and deployed is first reinforced. 14 is received and the unfolded load that could not be received by the reinforcing wall 14 flows into the notch 15. The notch 15 deploys the airbag door 11 in accordance with the movement of the deployed airbag door 11. The portion of the notch 15 extends in the direction so that the load can be absorbed. By finally propagating the load to the member changing portion 13, it is possible to effectively generate a break at the member changing portion 13. Can be suppressed. Therefore, according to the structure of the airbag door portion 1 of the present invention, it is possible to reliably prevent the members from scattering at the airbag door portion 1 accompanying the inflation and deployment of the airbag. Further, according to the structure of the airbag door portion 1 according to the present invention, the airbag deployment behavior is not disturbed, and it is possible to ensure a stable deployment behavior of the airbag. The reliability can be improved. Furthermore, even if the temperature of the passenger compartment R rises and the airbag door portion 1 is thermally deformed, the notch 15 can be expanded and contracted to absorb the thermal deformation, and the airbag door portion 1 Inflation or depression is eliminated, and deterioration of the appearance quality of the airbag door portion 1 can be prevented.

FIG. 8 shows a structure of an airbag door portion according to another embodiment of the present invention.
In the airbag door part 1 of this embodiment, as shown in FIG. 8, the notch 25 which covers the airbag cleaving part 12 can be extended and contracted by giving a width to the distance from the airbag cleaving part 12 in a front view. It is formed in a wave shape and is arranged in an annular shape. Thereby, even when a large airbag deployment load flows into the notch 25 in the low-strength portion, the load is absorbed by the expansion and contraction caused by the wave-shaped notch 25, and the notch 25 The occurrence of scattering of the members due to the concentration of the airbag deployment load on the airbag is suppressed, and the deployment behavior of the airbag is stabilized. Other configurations and operational effects are the same as in the above embodiment.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

  For example, in the above-described embodiment, only the airbag door portion 1 is constituted by the two-color resin-integrated instrument panel 2 made of a resin material having excellent viscosity and extensibility. Depending on the behavior, various variations can be selected, such as making only the airbag door 11 soft or using a high-strength material. Further, even if the airbag door portion 1 does not have a two-color molded shape formed integrally with the instrument panel 2 and the member of the airbag door portion 1 is assembled to the instrument panel 2, By having the features of the invention, the same effects can be achieved.

DESCRIPTION OF SYMBOLS 1 Airbag door part 2 Instrument panel 2a The upper surface part of an instrument panel 2b The back surface of an instrument panel 3 Airbag apparatus 11 Airbag door 12 Airbag tearing part 13 Member change part 14 Reinforcement wall (high-strength part)
15, 25 Notch (low strength part)
15a Inclined surface on the side of the airbag tearing portion 15b Inclined surface on the member change site side R Car interior

Claims (6)

In the structure of the airbag door part that is installed in the passenger compartment and is made of a different material from the surrounding parts,
A high-strength portion and a low-strength portion are provided between the airbag tearing portion formed in the airbag door and the member changing portion located around the airbag tearing portion,
The structure of the airbag door part, wherein the high-strength part is disposed on the airbag tearing part side, and the low-strength part is disposed on the member changing part side.   The high-strength portion and the low-strength portion are located outside the airbag tearing portion, and have side portions in four directions, front, rear, left, and right of the airbag tearing portion. The structure of the described airbag door part.   The structure of the airbag door part according to claim 1 or 2, wherein the high-strength part and the low-strength part are formed in a shape capable of covering the entire circumference of the airbag tearing part. .   The airbag according to claim 3, wherein the low-strength portion covering the entire circumference of the airbag tearing portion is formed in a corrugated shape having a distance from the airbag tearing portion. The structure of the door part.   The low-strength portion is formed by a notch having an inclined surface whose thickness changes between the airbag tearing portion side and the member changing portion side, and the surface of the notch on the airbag tearing portion side is loose. 5. The surface according to claim 1, wherein the surface on the member change site side of the notch is set to be a steep surface as compared with the airbag tearing portion side. The structure of the described airbag door part. The low-strength portion is disposed at a certain distance from the high-strength portion, and the high-strength portion is shorter than one half of the shortest distance between the member change portion and the high-strength portion. The structure of the airbag door part in any one of Claims 1-5 provided in the side.

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