JP2010058712A - Vehicular airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular airbag device capable of greatly improving sealing performance of an airbag of a type in which an inflator is inserted to an inside of the airbag from an insertion port. <P>SOLUTION: The vehicular airbag device includes: an airbag 1 formed of a base fabric 2 into a bag shape; the insertion port 4 formed on the airbag for inserting the inflator 3 with a harness 5 to the inside of the airbag; a pocket 9 formed of an auxiliary fabric 7 arranged in the periphery of the insertion port, with a port section 8 being opened toward inside the airbag and holding the inflator therein; a cover arranged in the airbag and shielding the periphery of the port section of the pocket from the insertion port side; a reinforcing fabric 13 arranged inside the pocket overlaid on the base fabric forming the airbag and forming a sleeve 14 inside the airbag for inserting the harness; a first communication hole 15 penetratingly formed in the reinforcing fabric and making the sleeve communicate toward inside the pocket; and a second communication hole 16 penetratingly formed in the base fabric at a distance from the first communication hole and making the sleeve communicate toward outside the airbag. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle airbag device capable of remarkably improving the sealing performance of an airbag of a type in which an inflator is inserted into an airbag from an insertion port.

Japanese Patent Application Laid-Open No. 2004-133620 discloses an airbag having an opening for inserting an inflator. In Patent Document 1, the sealing performance of the opening formed for inserting the inflator in the airbag main body that constitutes the airbag together with the tongue piece is improved without employing an extra component member. Since the tongue piece of the airbag is integrally extended from the opening wall portion of the opening portion of the airbag body, the outer peripheral edge portion of the tongue piece is the outer peripheral edge portion of the upper and lower walls of the airbag body corresponding thereto. At the same time, it is sewn as a sewing part. As a result, even if the inflator is inserted into the opening, the sealing performance of the inflator against the discharge gas can be improved.
Japanese Patent Laid-Open No. 10-53081

  In the background art, the inflator is accommodated inside the airbag while considering the sealing property. However, the hole that leads the harness connected to the inflator to the outside of the airbag communicates with the storage part of the inflator, and there is a possibility that the inflator gas that fills the storage part also leaks from this hole. There was a problem that there was a possibility that it could not be secured high.

  The present invention was devised in view of the above-described conventional problems, and is a vehicle airbag device capable of remarkably improving the sealing performance of an airbag of a type in which an inflator is inserted into an airbag from an insertion port. The purpose is to provide.

  An airbag apparatus for a vehicle according to the present invention includes an airbag formed in a bag shape with a base fabric, an insertion port formed in the airbag and for inserting an inflator with a harness into the airbag, and the insertion An auxiliary cloth provided around the mouth, the mouth is opened toward the inside of the airbag, a pocket for holding the inflator therein, and provided in the airbag; A cover concealed from the side of the insertion port; a reinforcing cloth that is provided in the pocket so as to overlap the base cloth that forms the airbag; and that forms a harness insertion sleeve inside the airbag; and the reinforcing cloth A first through hole formed to penetrate the sleeve and communicate with the inside of the pocket and a through hole formed in the base fabric at a distance from the first through hole to communicate the sleeve to the outside of the airbag. 2nd Characterized by comprising and.

  The auxiliary fabric is preferably formed by folding the base fabric around the insertion opening into the airbag.

  It is desirable that the cover is provided with a second reinforcing cloth, and the cover, the second reinforcing cloth, and the auxiliary cloth are penetrated to form a mounting bolt through hole for the inflator.

  The reinforcing cloth is preferably disposed around the inflator.

  In the vehicle airbag device according to the present invention, the sealing performance of the airbag of the type in which the inflator is inserted into the airbag from the insertion port can be significantly improved.

  Hereinafter, a preferred embodiment of a vehicle airbag apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a top view of a vehicle airbag device according to the present embodiment, FIG. 2 is a bottom view thereof, and FIG. 3 is a side sectional view thereof.

  An air bag 1 that is deployed and inflated with an inflator gas to restrain an occupant when an impact is applied to the vehicle is formed into a bag shape by a base fabric 2. The airbag 1 has a bag shape having a bag mouth by overlapping two base cloths 2 and joining S of the peripheral edges, or folding back one base cloth 2 and overlapping S of the peripheral edges. Formed. As a joining method of the base fabric 2, a well-known joining method in the airbag 1 such as sewing is adopted. In the illustrated example, a bag-like airbag 1 is formed by folding and sewing a single base fabric 2.

  The bag opening formed in the airbag 1 constitutes an insertion opening 4 for inserting the inflator 3 into the airbag 1. The inflator 3 is attached with a harness 5 for supplying an ignition signal when inflator gas is ejected. The inflator 3 is provided with a mounting bolt 6 for fastening to a fixed part such as a vehicle body. The inflator 3 including the mounting bolt 6 and the harness 5 is inserted into the airbag 1 from the insertion port 4.

  An auxiliary cloth 7 is provided around the insertion opening 4 of the airbag 1. In the present embodiment, the auxiliary cloth 7 is integrated with the base cloth 2 as a portion that can be folded back into the air bag 1 by extending the base cloth 2 from the outer contour of the air bag 1 around the insertion opening 4. It is formed. The auxiliary cloth 7 is formed with a length dimension that is approximately half the circumference of the insertion opening 4 and a width dimension inwardly of the airbag 1. The auxiliary cloth 7 is folded back and positioned inside the insertion opening 4 inside the airbag 1.

  The auxiliary cloth 7 has both longitudinal edges 7 a aligned with the peripheral edge of the airbag 1, one side edge 7 b in the width direction is aligned with the edge of the insertion port 4, and the other side edge 7 c in the width direction is the airbag. 1 It overlaps with the base fabric 2 so that it may be located inside. The auxiliary cloth 7 is joined to the base cloth 2 of the airbag 1 at both end edges 7a in the length direction.

  Thereby, the other side edge 7c located inside the airbag 1 expands when it is pulled up, and forms a mouth portion 8 that opens toward the inside of the airbag 1. As described above, the auxiliary cloth 7 forms the pocket 9 that holds the inflator 3 in the vicinity of the insertion opening 4. As shown in FIG. 4, the inflator 3 with the harness 5 inserted from the insertion port 4 is inserted into the pocket 9 from the port 8 (see arrow X in FIG. 3).

  The auxiliary cloth 7 may be formed as a part different from the base cloth 2 and joined to the base cloth 2. The joining method of the auxiliary cloth 7 is the same as the joining method of the base cloth 2.

  Around the insertion opening 4 of the airbag 1, the remaining area without the auxiliary cloth 7 constitutes a cover 10 that conceals the periphery of the opening 8 of the pocket 9 from the insertion opening 4 side. The cover 10 overlaps with the auxiliary cloth 7 that forms the pocket 9 in the vicinity of the insertion opening 4 so as to be able to contact and separate. A second reinforcing cloth 11 is overlapped and joined to the cover 10 inside the insertion opening 4 inside the airbag 1. The cover 10 and the second reinforcing cloth 11 are formed with through holes 12 for mounting bolts of the inflator 3. The bonding method of the second reinforcing cloth 11 is the same as the bonding method of the base cloth 2. The second reinforcing cloth 11 may not be provided.

  A reinforcing cloth 13 is provided in the pocket 9. In this embodiment, the reinforcing cloth 13 is disposed so as to overlap the base cloth 2 to the auxiliary cloth 7. Except for the portion of the auxiliary cloth 7, only the base cloth 2 may be disposed in an overlapping manner.

  The reinforcing cloth 13 is joined to the base cloth 2 by the linear joining portions L at two positions spaced apart from each other in the direction from the insertion port 4 toward the inside of the airbag 1 (width direction of the auxiliary cloth 7). These two linear joints L form a harness insertion sleeve 14 between the reinforcing cloth 13 and the base cloth 2 inside the airbag 1 (see FIG. 5).

  In the present embodiment, the reinforcing cloth 13 is formed to have a size covering substantially the entire inner surface of the pocket 9 so as to go around the inflator 3 along the folded auxiliary cloth 7 and reach the mouth 8 of the pocket 9. Yes. The reinforcing cloth 13 is also connected to the auxiliary cloth 7 by linear joints at two positions spaced from each other in the direction from the insertion opening 4 toward the inside of the airbag 1 (width direction of the auxiliary cloth 7) in the vicinity of the mouth section 8. Be joined. The joining method of the reinforcing cloth 13 is the same as the joining method of the base cloth 2.

  The reinforcing cloth 13 and the auxiliary cloth 7 are also formed with through-holes 12 for mounting bolts so as to match the through-holes 12 for mounting bolts of the cover 10 and the second reinforcing cloth 11.

  As shown in FIGS. 1 to 3 and 5, in order to guide the harness 5 of the inflator 3 from the inside of the pocket 9 into the sleeve 14, the sleeve 14 is placed inside the pocket 9. A first through hole 15 is formed to be communicated. The base fabric 2 is formed with a second through hole 16 through which the sleeve 14 communicates to the outside of the airbag 1 in order to guide the harness 3 from the inside of the sleeve 14 to the outside of the airbag 1. The second through hole 16 is disposed at a distance from the first through hole 15 so that the second through hole 16 cannot be seen through the first through hole 15. In the figure, 17 is a vent hole.

  Next, the operation of the vehicle airbag apparatus according to this embodiment will be described. When manufacturing the airbag 1, the base fabric 2 is created by extending the auxiliary fabric 7 that can be folded back from the outer contour of the airbag 1. A second through hole 16 is formed in the base fabric 2. The reinforcing cloth 13 is prepared and the first through hole 15 is formed.

  While confirming that the positions of the first through holes 15 and the second through holes 16 are deviated, the reinforcing cloths 13 are arranged so as to overlap from the base cloth 2 to the auxiliary cloth 7. These are joined at the joint L to form the sleeve 14. The second reinforcing cloth 11 is placed in an overlapping manner at the position of the cover 10 of the base cloth 2, and these are joined. Mounting bolt through holes 12 are formed through the cover 10 and the second reinforcing cloth 11, the auxiliary cloth 7 and the reinforcing cloth 13.

  Next, the periphery of the base fabric 2 is joined S so as to form a bag. At this time, the auxiliary cloth 7 with the reinforcing cloth 13 and the cover 10 with the second reinforcing cloth 11 are also joined together along the periphery of the base cloth 2. Thereby, the insertion port 4, the pocket 9, and the cover 10 are formed in the airbag 1.

  Next, the inflator 3 with the harness 5 is inserted into the airbag 1 from the insertion port 4. Once inserted into the airbag 1, the inflator 3 is inserted through the mouth 8 and held in the pocket 9.

  The harness 5 is inserted into the sleeve 14 through the first through hole 15 and further pulled out from the second through hole 16 to the outside of the airbag 1 through the sleeve 14.

  The mounting bolt 6 of the inflator 3 is passed through the mounting bolt through hole 12 and exposed to the outside of the airbag 1. The mounting bolt 6 is fastened to the plate 18 stacked from the outside of the cover 10, and the insertion opening 4 is closed by this fastening action. Then, the airbag 1 is folded small and packaged.

  In the vehicle airbag apparatus according to the present embodiment described above, in the airbag of the type in which the inflator 3 is inserted into the airbag 1 from the insertion port 4, the harnesses 5 connected to the inflator 3 are connected to each other. The first through hole 15 and the second through hole 16 that cannot be seen through the sleeve 14 can be led out from the inside of the airbag 1 to the outside of the airbag 1. Therefore, the leak of the inflator gas filling the pocket 9 from the airbag 1 can be reduced, and the sealing performance can be greatly improved.

  Since the pocket 9 for holding the inflator 3 is formed inside the airbag 1, the holding performance of the inflator 3 can be improved. The pocket 9 functions as a wall that blocks the inflator gas that is ejected, regardless of whether the auxiliary cloth 7 is a separate part or by folding, so that gas leakage from the airbag 1 can be reduced. Since the opening 8 of the pocket 9 is opened toward the inside of the airbag 1, the inflator gas can be filled smoothly into the airbag 1.

  Since the cover 10 that conceals the periphery of the mouth portion 8 of the pocket 9 from the insertion port 4 functions as a wall that blocks the inflator gas that is ejected, gas leakage from the airbag 1 can be reduced.

  Since the reinforcing cloth 13 having the function of reinforcing the heat damage caused by the inflator gas and the pressure of the inflator gas is joined to the base cloth 2 to form the harness insertion sleeve 14, the number of parts is reduced and the base cloth 2 and the reinforcing cloth 13 are attached. The sealing performance can be improved by a simple operation of simply forming the first and second through holes 15 and 16.

  Since the base cloth 2 is folded back around the insertion port 4 into the airbag 1 to form the auxiliary cloth 7, the auxiliary cloth 7 can be integrally formed with the base cloth 2, with a small number of parts and an easy assembly operation. Sealing performance can be improved.

  Since the cover 10 and the second reinforcing cloth 11 are provided so as to overlap with each other, and the cover 10, the second reinforcing cloth 11, the auxiliary cloth 7, and the reinforcing cloth 13 are penetrated, the through holes 12 for the mounting bolts of the inflator 3 are formed. The strength of the airbag at the place where the mounting bolt 6 is inserted can be increased. Moreover, since the insertion port 4 can be closed with the plate 18 fastened to the mounting bolt 6, the sealing performance can be further improved.

  Since the reinforcing cloth 13 is disposed around the inflator 3, the structural strength of the airbag 1 can be increased.

  The pocket 9 can be formed only by joining the peripheral edge of the base fabric 2 on which the auxiliary fabric 7 is stacked, and the airbag 1 can be manufactured with high productivity.

  FIG. 6 shows a side airbag system in which the airbag 1 is deployed and inflated from the seat back 19 toward the front of the vehicle. The vehicle airbag apparatus according to the present embodiment can be applied to various airbag systems including such a side airbag system.

  The vehicle airbag apparatus described above is a preferred example of the present invention, and other embodiments can be implemented or performed by various methods. In particular, the present invention is not limited to the detailed shape, size, configuration, and the like of the components shown in the accompanying drawings unless otherwise stated in the present specification. In addition, expressions and terms used in the present specification are for the purpose of explanation, and are not limited thereto unless otherwise specified.

It is a top view which shows suitable one Embodiment of the airbag apparatus for vehicles concerning this invention. It is a bottom view of the vehicle airbag apparatus shown in FIG. It is a sectional side view of the vehicle airbag apparatus shown in FIG. It is an expansion perspective view which shows the insertion state of the inflator to the airbag apparatus for vehicles shown in FIG. In FIG. 1, it is AA arrow main part sectional drawing. It is a perspective view of the side airbag system which shows the example of application of the airbag apparatus for vehicles concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airbag 2 Base cloth 3 Inflator 4 Insertion port 5 Harness 7 Auxiliary cloth 8 Portion 9 Pocket 10 Cover 11 Second reinforcement cloth 12 Mounting bolt through-hole 13 Reinforcement cloth 14 Sleeve 15 First through-hole 16 Second through-hole

Claims (4)

An airbag formed into a bag shape with a base fabric;
An insertion port formed in the airbag and for inserting an inflator with a harness into the airbag;
A pocket that is formed of an auxiliary cloth provided around the insertion opening, the mouth is opened toward the inside of the airbag, and holds the inflator inside;
A cover provided on the airbag and concealing the periphery of the mouth portion of the pocket from the insertion opening side;
A reinforcing cloth that is provided in the pocket so as to overlap the base cloth that forms the airbag, and that forms a sleeve for harness insertion inside the airbag;
A first through hole formed through the reinforcing cloth and communicating the sleeve to the inside of the pocket;
A vehicular airbag apparatus comprising: a second through hole formed through the base fabric and spaced from the first through hole and communicating the sleeve to the outside of the airbag.   The vehicular airbag apparatus according to claim 1, wherein the auxiliary fabric is formed by folding the base fabric around the insertion opening into the airbag.   The second reinforcing cloth is provided on the cover so as to overlap, and the cover, the second reinforcing cloth and the auxiliary cloth are penetrated to form a mounting bolt through hole for the inflator. Or the airbag apparatus for vehicles of 2.   The vehicle airbag device according to any one of claims 1 to 3, wherein the reinforcing cloth is disposed around the inflator.

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