JP2010006332A - Airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device capable of further improving certainty of rupture from a rupturing part. <P>SOLUTION: A recessed part 35a is provided by recessing an end part 3a in the longitudinal direction of a cover member 3 inward in the longitudinal direction on a forming part of a perforated slit 34 as the rupturing part. Consequently, it is possible to concentrate stress in a direction to expand the recessed part 35a on the deep side of the recessed part 35a by tensile stress in the circumferential direction working on the covered member 3 in inflating and deploying a curtain airbag 2 as an airbag body and to further improve the certainty of rupture from the perforated slit 34. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an airbag apparatus in which an elongated airbag body is accommodated in a cylindrical elongated covering member having both longitudinal ends opened.

As a conventional airbag device of this type, a breaking portion is formed in the covering member as a perforated slit along the longitudinal direction, and the covering member is broken at the breaking portion when the airbag body is inflated and deployed. Is known (for example, see Patent Document 1).
JP 2003-170798 A

  In this type of airbag device, it is required to more reliably break the covering member from the broken portion during inflation and deployment.

  Then, an object of this invention is to obtain the airbag apparatus which can further improve the certainty of a fracture | rupture from a fracture | rupture part.

  In the invention of claim 1, it has a covering member that accommodates an airbag main body that is formed in an elongated cylindrical shape with both ends in the longitudinal direction being opened and folded inside thereof, and extends along the longitudinal direction of the covering member. In the airbag device in which a breaking portion for breaking the covering member is formed when the airbag main body is deployed, an end portion in the longitudinal direction of the covering member is recessed toward the inside in the longitudinal direction at a portion where the breaking portion is formed. It is provided.

  In the invention of claim 2, the covering member is formed in a cylindrical shape by stitching the widthwise end edges of the belt-shaped member with stitched portions, and the stitched portion is provided at a position different from the fracture portion. It is characterized by that.

  In the invention of claim 3, it has a covering member which accommodates the airbag main body which was formed in the long and thin cylinder shape which opened the longitudinal direction both ends, and was folded in the inside, and the covering member is the width direction of a beltlike member A position in which the both ends of the edge are sewn together by a stitched portion is formed into a cylindrical shape, and a breaking portion that breaks the covering member when the airbag body is deployed along the longitudinal direction of the covering member is different from the stitched portion. In the airbag device formed in the above, the longitudinal end portion of the covering member protrudes outward in the longitudinal direction at the formation portion of the stitching portion.

  According to the first aspect of the present invention, the stress in the direction of expanding the recessed portion can be concentrated on the back side of the recessed portion by the circumferential tensile stress acting on the covering member when the airbag body is inflated and deployed. it can. Therefore, the certainty of the fracture | rupture from a fracture | rupture part can be improved further.

  According to the invention of claim 2, the stitched portion can be provided off the stress concentration site, and the covering member is prevented from breaking from the stitched portion, thereby further improving the certainty of breaking from the broken portion. Can do.

  According to the invention of claim 3, since the tensile stress in the circumferential direction acting on the covering member at the time of inflating and deploying the airbag body is less likely to act on the stitched portion, the covering member is prevented from breaking from the stitched portion, The certainty of breakage from the breakage portion can be further enhanced.

  1 is an overall perspective view showing a stored state of an airbag device according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a portion II in FIG. 1, and FIG. 3 is a main portion showing an end portion of a covering member. FIG. 4 is an enlarged cross-sectional view, and FIG. 4 is an enlarged front view of the main part showing one end of the covering member that houses the airbag body.

  As shown in FIG. 1, an airbag device 1 according to this embodiment includes a curtain airbag 2 as an airbag body, and a covering member 3 that holds the curtain airbag 2 in a folded state when the curtain airbag 2 is stored. And.

  As is generally known, the curtain airbag 2 is deployed so as to cover the side of the vehicle interior of the automobile, that is, the inside of the front door glass and the rear door glass in the event of an emergency such as a side collision or rollover to protect the passenger. It has become. That is, when the curtain airbag 2 is unfolded before folding (not shown), the curtain airbag 2 has a dimension on the side along the vehicle longitudinal direction in order to cover the vehicle interior side surface over a relatively long range in the vehicle longitudinal direction. It has a long and substantially rectangular shape. Therefore, the curtain airbag 2 is elongated along the vehicle front-rear direction in a state where the curtain airbag 2 is folded and stored in the deployment direction, that is, the vehicle vertical direction.

  The folded curtain airbag 2 is stored along the vehicle interior side of the side roof rail (not shown) disposed on the upper side of the vehicle interior side. At this time, the folded curtain airbag 2 is stored in the above-described manner. It is housed in the elongated cylindrical covering member 3 so that the folded state can be easily maintained, the protection during the mounting operation is improved, and it can be easily handled.

  2 and 3, the covering member 3 is a cylinder in which both end portions 3a and 3b in the longitudinal direction are opened by overlapping and sewing the side edge portions 31a and 31b of the belt-like base fabric material 31. It is formed in a shape. The stitching portion 32 is provided along the longitudinal direction of the covering member 3 (that is, the vehicle front-rear direction). In addition, as shown in FIG. 4, the end portion 3 a is provided with a stitch-back portion 32 a in order to suppress fraying from the stitching portion 32. In the present embodiment, the stitching portion 32 is disposed at the lower end portion of the covering member 3.

  As shown in FIG. 1, the curtain airbag 2 is provided with a plurality of attachment pieces 21 protruding at appropriate intervals in the longitudinal direction, and the folded curtain airbag 2 is inserted into the cylindrical covering member 3. When these are mounted, the mounting pieces 21 are projected outward from the insertion holes 33 formed in the covering member 3. In the state where the curtain airbag 2 is folded and stored in the covering member 3, the tube 23 connected to the inflator 22 protrudes from the rear end portion 3 b (left side in the figure) of the covering member 3, while A part of the folded curtain airbag 2 protrudes from the front end 3a (right side in the figure), and a tension strap 24 protrudes from the tip of the curtain airbag 2.

  As shown in FIGS. 2 and 3, the covering member 3 has a curtain airbag 2 on an upper end (upper edge) opposite to the lower end (lower edge) provided with the above-described stitching portion 32. A perforated slit 34 is formed along the longitudinal direction of the covering member 3 as a breaking portion that breaks the covering member 3 when the covering member 3 is expanded. In other words, the perforated slit 34 and the stitching portion 32 are provided at different positions (positions facing each other across the central axis of the covering member 3 in this embodiment). As shown in FIG. 2, the perforated slit 34 has a shape in which a plurality of slit portions 34 a having a predetermined length are formed with a predetermined interval L therebetween.

  Here, in the present embodiment, the longitudinal end portion 3a of the covering member 3 is a portion where the perforated slit 34 is formed (the upper end portion of the covering member 3 in the present embodiment), and the longitudinal direction inward (that is, the vehicle). It is recessed toward the front-rear direction center).

  In particular, in the present embodiment, the end portion 3 a in the longitudinal direction of the covering member 3 is recessed at the portion where the perforated slit 34 is formed, and the upper end portion where the perforated slit 34 is formed is the longest longitudinal portion of the covering member 3. As shown in FIGS. 2 to 4, an inclined portion 35 that is linearly inclined in a side view is formed on the end portion 3 a of the covering member 3 so as to be located on the inner side in the direction. More preferably, as shown in FIGS. 2 and 3, the slit portion 34 a of the perforated slit 34 is divided by the inclined portion 35 so that the slit portion 34 a is opened to the end portion 3 a of the covering member 3. deep.

  In the present embodiment, the longitudinal end portion 3a of the covering member 3 is formed at a portion where the stitching portion 32 is formed (in this embodiment, the lower end portion of the covering member 3). The front end projects forward and the rear end projects rearward).

  In the present embodiment, as described above, the perforated slit 34 is disposed at the upper end portion of the covering member 3, while the stitching portion 32 is disposed at the lower end portion of the covering member 3, thereby forming the end portion 3 a of the covering member 3. By providing the inclined portion 35, the end portion 3 a of the covering member 3 can be projected at the formation portion of the stitching portion 32. Accordingly, the lower end of the inclined portion 35 that is the outermost position in the longitudinal direction is the projecting portion 35b.

  In the present embodiment, the longitudinal end portion 3a of the covering member 3 is recessed inward in the longitudinal direction at the formation portion of the perforated slit 34, and at the formation portion of the suture portion 32, The inclined portion 35 that obtains a configuration protruding outward in the direction can be easily obtained by cutting the belt-shaped base fabric material 31 with the stitching portion 32 and then obliquely cutting the longitudinal direction.

  With the above configuration, in the airbag device 1 according to the present embodiment, the end portion 3a in the longitudinal direction of the covering member 3 is recessed toward the inside in the longitudinal direction at the formation portion of the perforated slit 34 as the fracture portion. And provided with a recessed portion 35a. Therefore, the stress of the direction which expands this can be concentrated in the back side of the recessed part 35a by the circumferential tensile stress which acts on the coating | coated member 3 at the time of the expansion | deployment of the curtain airbag 2 as an airbag main body. It is possible to further increase the certainty of breakage from the perforated slit 34 as the breakage portion of the covering member 3 located in the recessed portion 35a.

  Further, in the present embodiment, the covering member 3 is formed in a cylindrical shape by sewing the width direction end edges of the belt-like member, and the stitching portion 32 is provided at a position different from the perforated slit 34 as the fracture portion. It was. Therefore, the stitched portion 32 can be removed from the stress concentration portion, and the covering member 3 can be prevented from breaking from the stitched portion 32, and the certainty of breaking from the perforated slit 34 as the broken portion can be further increased. Can be increased. In particular, when the stitched portion 32a is provided at the longitudinal end portion of the stitching portion 32 as in the present embodiment, the stitched portion 32a is slightly fragile. Even in such a case, the perforated slit 34 can be more reliably broken.

  Moreover, in this embodiment, the edge part 3a of the longitudinal direction of the coating | coated member 3 was made to protrude toward the said longitudinal direction outward in the formation part of the stitching | suture part 32. FIG. Accordingly, since the tensile stress in the circumferential direction acting on the covering member 3 during the inflation and deployment of the airbag body of the curtain airbag 2 is less likely to act on the stitching portion 32, the covering member 3 is prevented from acting from the stitching portion 32. The certainty of breakage from the perforated slit 34 as the breakage portion can be further enhanced.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made. For example, the fracture portion only needs to be a weak portion in strength, and can have a configuration other than the perforated slit. In addition, the inclined portion 35 is not limited to the end portion 3a on the front side of the vehicle of the covering member 3, but can be formed on the end portion 3b on the rear side of the vehicle or both the end portions 3a and 3b. Moreover, forming the recessed portion and the protruding portion of the end 3a of the covering member 3 by cutting the end 3a obliquely is merely an example, and the shape of the end 3a (for example, an uneven shape or an angle) Etc.) can be changed as appropriate.

It is a whole perspective view which shows the storage state of the airbag apparatus concerning one Embodiment of this invention. It is an expanded sectional view of the II section in FIG. It is a principal part expanded sectional view which shows the edge part of the coating | coated member concerning one Embodiment of this invention. It is a principal part enlarged front view which shows the one end part of the coating | coated member which accommodated the airbag main body concerning one Embodiment of this invention.

Explanation of symbols

1 Airbag Device 2 Curtain Airbag (Airbag Body)
3 Covering member 32 Sewing part 32a Reversing part 34 Perforated slit (breaking part)
35 inclined portion 35a recessed portion 35b protruding portion

Claims (3)

A covering member that accommodates an airbag main body that is formed in an elongated cylindrical shape with both ends in the longitudinal direction opened and folded therein, and the covering member is disposed when the airbag main body is deployed along the longitudinal direction of the covering member. In the airbag device in which the rupture portion to be broken is formed,
The airbag apparatus according to claim 1, wherein an end portion in the longitudinal direction of the covering member is recessed inward in the longitudinal direction at a portion where the fracture portion is formed.   The said covering member was formed in the cylinder shape by stitching the both edges of the width direction of a strip | belt-shaped member with a stitching | suture part, The said stitching | suture part was provided in the position different from the said fracture | rupture part. The airbag apparatus as described. It has a covering member that accommodates an airbag main body that is formed in an elongated cylindrical shape with both ends in the longitudinal direction open and folded inside, and the covering member sews both edges in the width direction of the belt-like member at the stitching portion. In the airbag device in which the rupture portion that breaks the covering member at the time of deployment of the airbag body along the longitudinal direction of the covering member is formed at a position different from the stitched portion,
An airbag device, wherein an end portion in a longitudinal direction of the covering member protrudes outward in the longitudinal direction at a portion where the stitched portion is formed.

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