JP2002067851A - Vehicular airbag structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost by reducing the number of components and man- hours for mounting by eliminating a metallic guide. SOLUTION: A pair of unfolding preventive bands 21, 21 are wrapped around a folded airbag body 3 in this vehicular airbag structure, and a guide body 35 to control the expanding direction of the airbag body 3 is integrally provided between the pair of unfolding preventive bands 21, 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle airbag structure.

[0002]

2. Description of the Related Art Some vehicles such as automobiles are provided with an airbag device as an emergency safety means. As shown in FIG. 8, the airbag device is folded and housed in a housing 2 (airbag module) provided inside the instrument panel 1 or the like when an impact force of a predetermined value or more is applied to the vehicle body. The airbag body 3 is
Due to the pressure of the pressurized gas from the inflator 4, the swelling bulges toward the occupant side of the passenger compartment, receives the head of the occupant seated at a fixed position, and protects the head from contacting the instrument panel 1 and the like. Things.

When the airbag body 3 is inflated, the airbag body 3 presses an airbag lid 5 formed on the instrument panel 1 and the like, and cleaves a cleavage line 6 formed on the airbag lid 5 to inflate the airbag. Forming an outlet,
The swelling portion is swelled toward the occupant side of the vehicle cabin.

In FIG. 8, reference numeral 7 denotes a front window glass. In FIG. 8, the instrument panel 1 has a three-layer structure including a skin 8, a foam layer 9, and a core material 10.

FIGS. 9 to 12 show a conventional vehicle airbag structure. That is, the airbag module 11 provided at the front position of the passenger seat in the instrument panel 1 is provided with an inflator storage container 13 for storing the inflator 4, and the inflator storage container 13 is steered via the fixed bracket 14. It is fixed to a vehicle body side member 12 such as a member. A pressure gas ejection opening 15 is formed in the upper surface of the inflator storage container 13.

[0006] An airbag main body storage container 17 for accommodating the airbag main body 3 in a folded state and guiding the airbag main body 3 when deployed is integrally mounted substantially above the inflator storage container 13. ing.

A pressure gas inflow opening 16a is formed in the airbag body 3, and a metal retainer member 18 is mounted in advance inside the pressure gas inflow opening 16a. Retainer bolts 19, 19 are implanted in the retainer member 18, and the retainer bolts 19, 19 pass through the peripheral edge of the pressure gas inflow opening 16a and protrude substantially downward.

Then, an airbag main body storage container 17 is placed in contact with the upper portion of the inflator storage container 13, and the folded airbag main body 3 is stored in the airbag main body storage container 17, and the inflator storage container 13 is provided. The airbag body 3
After the pressure gas inflow opening 16a of the airbag main body is opposed to each other and the retainer bolts 19, 19 of the retainer member 18 are inserted through the bolt holes on the peripheral edge of the pressure gas ejection opening 15 of the airbag body storage container 17 and the inflator storage container 13, the retainer is The airbag module 11 is integrated by screwing the nut members 20, 20 to the bolts 19, 19 from the tip side.

As shown in FIG. 10, the airbag body 3 is a bag-like material obtained by laminating two base cloths and sewing the peripheral edges thereof.
It is formed substantially at the center of one of the base fabrics. A reinforcing cloth member 22 integrally provided with a pair of left and right anti-collapse bands 21 and 21 is attached to the periphery of the pressure gas inflow opening 16a of the airbag body 3. This collapse prevention band 2
Reference numeral 1 denotes a band-shaped band body 21a wound around the airbag body 3, and a locking hole 2 formed at a substantially center line of the width of the band body 21a and formed at a tip end of the band body 21a.
1b. Further, a pair of left and right slit portions 21c is formed in the center portion of the band main body 21a so as to be easily cut during deployment. Each of the pair of left and right slit portions 21c is formed to have substantially the same length reaching substantially the center line of the width of the band body 21a.

In the conventional airbag structure for a vehicle constructed as described above, first, the airbag body 3 folds the left and right edges 16b, 16b a plurality of times (vertically folded), respectively, to thereby retain the retainer member. After the width a is substantially the same as the width 18, the front and rear edges 16 c, 16 d are folded inward (horizontal folding) from the front-rear direction to be assembled as shown in FIG. 11.

In the vicinity of the left and right ends 16e, 16e of the folded airbag main body 3, the band main bodies 21a, 21a of the buckling prevention bands 21, 21 are wound around, respectively, and the center of the width of the band main body 21a is substantially increased. As shown in FIG. 12, each of the locking holes 21b, 21b located on the line
By being fitted to the retainer bolts 19, 19, breakage is prevented.

[0012]

However, such a conventional vehicle airbag structure has the following problems.

That is, the airbag module 11 is fixed to a vehicle body-side member 12 such as a steering member via a fixing bracket 14, and then the instrument panel 1 is placed on the vehicle body from above the airbag module 11. When assembling, the airbag body storage container 17
When the airbag body 3 is deployed, the airbag body 3 enters the gap 25 and the instrument panel 1
(The so-called deployment in the instrument panel).

Conventionally, in order to prevent such deployment in the instrument panel, the instrument panel 1 is provided with a guide 26 made of metal or the like for preventing the deployment in the instrument panel around the bulging opening on the back side. Like that.

For this reason, mounting the guide 26 made of metal or the like to the instrument panel 1 requires a large number of parts and a large number of man-hours, which is costly.

SUMMARY OF THE INVENTION An object of the present invention is to provide an airbag structure for a vehicle which solves the above-mentioned problems, reduces the number of parts and the number of mounting steps by eliminating a metal guide, and can reduce the cost. Is to do.

[0017]

According to the first aspect of the present invention, there is provided an airbag structure for a vehicle in which a pair of folding prevention bands are wound around a folded airbag body. Wherein a guide body for controlling a deployment direction of the airbag body is integrally provided between the pair of folding prevention bands.

According to the first aspect of the present invention, the guide body integrally provided between the buckling prevention bands controls the deployment direction of the airbag body, so that the inside of the instrument panel can be controlled. Deployment can be reliably prevented. Therefore, it is possible to eliminate post-installed parts such as a metal guide, and to reduce the number of parts and the number of mounting steps, thereby achieving cost reduction.

According to the second aspect of the present invention, the guide body and the buckling prevention band are provided on the tongue-shaped piece formed on the reinforcing cloth member attached to the periphery of the pressure gas inflow opening of the airbag body. The tongue-shaped piece is formed integrally by making a cut.

According to the second aspect of the present invention, a notch is formed in the tongue formed on the reinforcing cloth member on the periphery of the pressure gas inflow opening, so that it can be easily and simultaneously collapsed at a time. A prevention band and a guide body can be created.

According to the third aspect of the present invention, the airbag body of the guide body is provided at an end of the tongue-shaped piece remote from the pressure gas inflow opening with respect to the pair of buckling prevention bands. An arc-shaped notch is provided to allow displacement in the developing direction.

According to the third aspect of the present invention, the arch-shaped notch prevents the collapse of the airbag body at the initial stage of deployment of the airbag body, so that the tip is fixed and cannot be displaced. The band can be allowed to displace the guide body in the airbag body deployment direction with little resistance.

In the invention described in claim 4, a non-cut portion which is broken by a predetermined tensile force is formed in the middle of the vertical cut in the cut.

According to the fourth aspect of the present invention, the non-cut portion prevents the guide body from being turned up at the time of assembling and transporting, thereby facilitating the handling of the guide body. During deployment, the non-cut portion is broken by a predetermined tensile force, so that the operation of the guide body can be ensured. The predetermined tensile force is a force received from the airbag body at the time of deployment.

According to a fifth aspect of the present invention, an inclined cut portion capable of cutting a yarn passing through the non-cut portion is formed at an end of the non-cut portion.

According to the fifth aspect of the present invention, the weaving yarn passing through the non-cut portion can be cut by the inclined cut portion, so that the non-cut portion can be cut before deployment. The woven yarn is maintained in a connected state by entanglement of the yarn by weaving, so that the woven yarn in the non-cut portion can be easily separated by the predetermined force during deployment.

[0027]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 7 show a first embodiment of the present invention. Parts that are the same or equivalent to those in the conventional example will be described with the same reference numerals.

First, the structure will be described. As shown in FIG. 1, the instrument panel 1 has a three-layer structure in which a skin 8, a foam layer 9 and a core material 10 are integrated as in FIG. After the airbag module 11 is fixed to a vehicle body-side member 12 such as a steering member via a fixing bracket 14, the airbag module 11 is configured to cover the vehicle body from above the airbag module 11. A swelling opening 51 is formed in the core member 10, and a door member 52 is attached to the swelling opening 51.

In the first embodiment, as shown in FIG. 2, a pair of band-shaped buckling prevention bands 21, 21 are provided near the left and right ends 16e, 16e of the folded airbag body 3. And locking holes 21b, 2 formed at the tips of the buckling prevention bands 21, 21.
1b is fitted to retainer bolts 19, 19 projecting from a retainer member 18 attached to the pressurized gas inflow opening 16a of the airbag body 3, and the buckling prevention bands 21,
The distal end of 21 is locked and fixed.

The buckling prevention bands 21 and 21 are formed with slit portions 31 and 32 having a long outside and a short inside.

Then, a pair of buckling prevention bands 21,
A guide body 35 for controlling the deployment direction of the airbag body 3 is provided integrally between the airbag bodies 21 so that the airbag body 3 does not deploy in the instrument panel during deployment.

As shown in FIG. 3, the guide body 35
It is composed of a reinforcing cloth member 22 attached to the peripheral edge of the pressurized gas inflow opening 16a and a cloth body integrated with the pair of left and right anti-collapse bands 21 and 21.

That is, a tongue-shaped piece 36 having a size including the left and right anti-collapse bands 21 and 21 is formed on the reinforcing cloth member 22, and this tongue-shaped piece 36 is substantially H-shaped in plan view. By forming the notch 37 having a U-shape, the left and right anti-collapse bands 21 and 21 are formed outside the vertical notch 38 of the H-shape, and the H-shape (or U-shape) is formed together. The guide body 35 is also formed inside the vertical notch 38 of FIG.

The guide member 35 is divided into a front guide member 40 and a rear guide member 41 by an H-shaped transverse cut 39. In the case of FIG. 3, the rear guide body piece 41 has a larger shape than the front guide body piece 40.

The end of the tongue-shaped piece 36 on the side of the locking hole 21b (the side away from the peripheral edge of the pressure gas inflow opening 16a)
A pair of buckling prevention bands 21 and 21 having both ends fixed
An arc-shaped notch 42 (deformation allowance portion at the time of deployment) is formed at the tip to allow displacement of the guide body 35 in the airbag body deployment direction.
It has an unreached portion 43 and is formed to a length that does not reach the arched notch 42.

Further, the H-shaped vertical cut 38 has a non-cut portion 45 which is broken at a predetermined tension in the rear guide piece 41 in the middle.

From both ends of the non-cut portion 45, a pair of substantially parallel inclined cut portions 46 and 47, which are directed in opposite directions, can cut the yarn passing through the non-cut portion 45. It is formed as follows. Here, the cloth constituting the guide body 35 is formed by plain weave having a texture parallel to the H-shaped cut 37, and the ends of the inclined cut portions 46 and 47 are at least inclined cuts on the opposite side. The length of each of the end portions of the insertion portions 46 and 47 reaches the side along the texture. Preferably, the ends of the inclined cuts 46 and 47 have a length that reaches the side along the texture of the end opposite to the non-cut 45.

The notch 37 and the inclined notches 46, 47
Is formed by laser processing, cutter processing, or the like. When the cut 37 and the inclined cut portions 46 and 47 are formed by laser processing, if the woven yarn is made of a resin such as nylon, the cut 3
7 and the inclined cut portions 46 and 47 can be in a semi-welded / semi-cut state in which they are not completely cut. In this manner, by setting the cuts 37 and the inclined cuts 46 and 47 in a semi-welded / semi-cut state, the operation before and after the deployment can be made more reliable. According to the laser processing, it is also possible to make only the inclined cut portions 46 and 47 into a semi-welded / half-cut state.

Next, the operation of the first embodiment will be described.

The airbag module 11 is attached to a vehicle body side member 12 such as a steering member via a fixing bracket 14.
After that, the vehicle is assembled by placing the instrument panel 1 on the vehicle body from above the airbag module 11.

When the airbag body 3 is deployed, first, as shown in FIG. 4, the entire tongue piece 36 is pushed up by the airbag body 3 from the state of FIG. At this time, since the tongue-shaped piece 36 has an arched notch 42 (deformation allowance portion at the time of deployment) formed at the end edge on the side of the locking hole 21b, the arched notch 42 allows the airbag body 3
In the initial stage of deployment, the guide members 35 can be allowed to be displaced in the direction of deployment of the airbag body with little resistance to the buckling prevention bands 21 and 21 whose distal ends are fixed and cannot be displaced.

Further, the non-cut portion 45 of the H-shaped vertical cut 38 in the tongue-shaped piece 36 is separated by a predetermined tensile force when the airbag body 3 is deployed, and the rear guide body piece 41 is folded. It is separated from the collapse prevention bands 21 and 21. And
Due to the pressure from the airbag body 3, the front guide piece 4
0 and the rear guide piece 41 are opened outward, and as shown in FIG. 1, the airbag body 3 is guided to be in a state where deployment in the instrument panel can be prevented.

Until the non-cut portion 45 is separated in this manner, the rear guide piece 41 is fixed to the left and right folding prevention bands 2.
Since they are integrated with the first and second guides 21, 21, the rear guide body piece 41 will not be unnecessarily turned up. Therefore,
The non-cut portion 45 prevents the guide body 35 from being turned up at the time of assembling / transporting, thereby facilitating the handling of the guide body 35, and breaking the non-cut portion 45 with a predetermined tensile force at the time of deployment. Thereby, the operation of the guide body 35 can be ensured. The predetermined pulling force is a pressure received from the airbag body 3 during deployment.

As shown in FIG. 5, the non-cut portion 45 may be used to remove the weft yarn from the warp yarn at the lower portion of the inclined cut portion 46, as shown in FIG.
Alternatively, as shown in FIG. 6, the weft thread is removed or separated from the warp thread at the upper part of the inclined cut portion 47. Therefore, by allowing the weaving yarn passing through the non-cutting portion 45 to be cut by the inclined cutout portions 46 and 47, the non-cutting portion 45 is connected to the non-cutting portion 45 by the entanglement of the yarn by weaving before development. The uncut portion 45 is maintained by the predetermined force during the deployment.
Of the woven yarn can be easily cut off.

Finally, as shown in FIG. 7, the pressure from the airbag body 3 causes the left and right collapse prevention bands 2
1 and 21 are cut, and the airbag body 3 is deployed.

When the airbag body 3 is deployed, the front guide piece 40 and the rear guide piece 41 close the gap 25 formed between the airbag body storage container 17 and the instrument panel 1. The so-called deployment in the instrument panel, in which the bag body 3 enters the gap 25 and deploys in the instrument panel 1, is reliably prevented.

Therefore, it is possible to eliminate a retrofitted part such as the metal guide 26 as shown in FIG. 8, and it is possible to reduce the number of parts and the number of mounting steps, thereby achieving cost reduction.

Moreover, the guide body 35 of the first embodiment
Are reinforcing cloth members 22 attached to the peripheral edge of the pressure gas inflow opening 16a and a pair of left and right folding prevention bands 21 and 21.
Since it is constituted by a cloth body integral with the above, the folding prevention bands 21 and 21 and the guide body 35 can be easily and simultaneously formed only by making the cuts 37 in the cloth body. In addition, the portions that have been thrown away to form the fold prevention bands 21 and 21 can be effectively used.

[0050]

As described above, according to the first aspect of the present invention, the guide body integrally provided between the buckling prevention bands controls the deployment direction of the airbag body, so that the instrument panel is provided. Inward deployment can be reliably prevented. Therefore, it is possible to eliminate post-installed parts such as a metal guide, and to reduce the number of parts and the number of mounting steps, thereby achieving cost reduction.

According to the second aspect of the present invention, a notch is formed in the tongue-like piece formed on the reinforcing cloth member on the periphery of the pressure gas inflow opening, thereby easily and simultaneously forming the fold prevention band and the guide body. can do.

According to the third aspect of the present invention, at the initial stage of deployment of the airbag body, due to the arch-shaped notch, the tip of the band is hardly displaced because the tip is fixed, and there is almost no resistance. The guide body can be allowed to displace in the airbag body deployment direction.

According to the fourth aspect of the present invention, the non-cut portion prevents the guide body from being turned up at the time of assembling and transporting, thereby facilitating the handling of the guide body. By breaking with a predetermined tensile force, the operation of the guide body can be ensured. The predetermined tensile force is a force received from the airbag body at the time of deployment.

According to the fifth aspect of the present invention, the weaving yarn passing through the non-cut portion can be cut by the inclined cut portion. It is maintained in a connected state, and can exert a practically useful effect that the non-cut portion yarn can be easily cut off by the predetermined force during deployment.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an instrument panel portion according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the folded airbag body, illustrating a state in which a folding prevention band is wound around and a guide body is set in the vehicle airbag structure of the first embodiment.

FIG. 3 is an enlarged view of a reinforcing cloth member in which a folding prevention band and a guide body are integrally formed.

FIG. 4 is a first operation diagram of FIG. 2;

FIG. 5 is a partially enlarged view showing a state where a non-cut portion is separated.

FIG. 6 is a partially enlarged view showing another state in which a non-cut portion is separated.

FIG. 7 is a second operation diagram of FIG. 2;

FIG. 8 is a side cross-sectional view of an instrument panel showing a conventional airbag structure for a vehicle.

FIG. 9 is a schematic diagram illustrating a state of mounting in a conventional airbag structure for a vehicle.

FIG. 10 is a plan view of a conventional airbag structure for a vehicle, as viewed from a surface side on which an airbag body before folding is mounted.

FIG. 11 is a perspective view of a folded airbag body for explaining a state in which a folding prevention band is wound in a conventional airbag structure for a vehicle.

FIG. 12 is a perspective view illustrating a configuration of a main part of a conventional airbag structure for a vehicle.

[Explanation of symbols]

 3 Airbag Main Body 16a Pressure Gas Inlet Opening 21 Folding Prevention Band 22 Reinforcement Cloth Member 35 Guide Body 36 Tongue 37 Notch 38 Vertical Notch 42 Notch 45 Non-Notch 46 Inclined Notch 47 Inclined Notch

Claims (5)

[Claims] In a vehicle airbag structure in which a pair of buckling prevention bands are wound around a folded airbag body, a deployment direction of the airbag body is controlled between the pair of buckling prevention bands. An airbag structure for a vehicle, wherein a guide body is provided integrally. 2. A tongue-like piece formed on a reinforcing cloth member attached to a peripheral edge of a pressure gas inflow opening of the airbag body, wherein the guide body cuts into the tongue-like piece together with the folding prevention band. The vehicle airbag structure according to claim 1, wherein the vehicle airbag structure is formed integrally by being inserted. 3. An end of the tongue-shaped piece remote from the pressure gas inflow opening is allowed to displace the guide body in a direction in which the airbag body is deployed with respect to the pair of buckling prevention bands. 3. The vehicle airbag structure according to claim 2, wherein an arch-shaped notch is provided. 4. The vehicle airbag structure according to claim 2, wherein a non-cut portion that is broken by a predetermined tensile force is formed in the middle of the vertical cut in the cut. 5. An airbag structure for a vehicle according to claim 4, wherein an inclined cut portion is formed at an end of said non-cut portion so as to cut a yarn passing through said non-cut portion.