JP4966569B2 - Airbag - Google Patents

Description

  The present invention relates to a vehicle airbag as an occupant protection device.

  This type of vehicle airbag includes side airbags attached to vehicle seats, driver seat airbag devices, passenger seat airbag devices, and curtain airbags that deploy in a curtain shape along the vehicle side window frame. Examples include a bag or a knee airbag disposed in front of a seated passenger to protect the knees and feet of the passenger.

As this type of conventional vehicle airbag device, for example, a side airbag, one described in Patent Document 1 or Patent Document 2 is known.
JP-A-9-272388. JP2003-276547A.

  According to Patent Document 1, a vehicle airbag is provided with a hole in a predetermined portion of a base fabric constituting an airbag, and a sewing part is provided around the hole, and the sewing part is formed in the hole. Start from within the planned area and surround the outer periphery of the area, and further, provide an overlap portion of the seam line outside the planned drilling area to end the sewing portion, and drill the area after sewing. The end portion of the sewing portion is sewn on the outer side of the scheduled drilling region, thereby preventing fraying of the sewing thread at the outer peripheral end portion.

  According to Patent Document 2, the airbag has an inflator mounting hole and / or a vent hole, and a reinforcing cloth is sewn on the peripheral edge of the hole, and the sewing is performed to sew the reinforcing cloth. It has a sewing part for identifying the type of the base fabric panel and / or the airbag bag body by the thread, and the sewing part is constituted by a sewing thread sewing part for sewing the reinforcing cloth. Is.

  Then, in the vehicle airbag described in the cited document 1, the sewing portion has a start end that is provided in advance from within the planned drilling region of these openings in order to reinforce the opening edges of the inflator mounting holes and gas exhaust holes. Start sewing, go out to the perimeter of the planned drilling area and sew it in a single stroke so as to enclose this area in a circular shape, and the sewing end is sewn on the circular sewing part Therefore, since the play amount of the thread end at the start of sewing of the sewing part becomes considerably long and does not affect the workability after assembling the airbag and the inflator, the sewing start part is set in the part to be drilled after sewing It is a thing.

  However, since the sewing end is sewn and arranged on the outer edge side of the circular sewing portion, the peripheral portion of the opening that is the inflator mounting hole or the vent hole is pulled when the airbag is inflated and deployed. In such a case, the sewing thread of the sewing part may be misaligned at the sewing end, and gas leakage may occur, and there is a concern about breakage of the base fabric panel or the sewing thread due to misalignment of the sewing thread. A high-strength base fabric panel, a reinforcing cloth, or a high-strength sewing thread must be used, or it has been necessary to take measures such as increasing the number of sewing turns of the sewing portion.

  Therefore, as a high-strength base fabric panel, for example, measures such as increasing the base fabric thickness or increasing the number of sewing turns will be adopted. It must be increased in size, which ultimately increases costs.

  Further, in the airbag described in Patent Document 2, the sewing end portion of the sewing portion in the region where the hole is scheduled to be drilled and the stitching overlap portion at the end portion extend a predetermined length. By stitching the end portion with the predetermined length at the outer extension portion of the sewing portion, the needle holes in the sewing portion are concentrated close to each other, and the airbag is inflated and deployed in the same manner as the airbag described in Patent Document 1. Sometimes, when the peripheral portion of the opening, which is the inflator mounting hole or the vent hole, is pulled, there is a risk of misalignment of the sewing thread in the sewing portion, which may cause gas leakage, and the misalignment of the sewing thread There is concern about the breakage of the fabric panel and the sewing thread, so it is necessary to take measures such as using a strong base fabric panel, a reinforcing cloth or a high-strength sewing thread, or increasing the number of sewing loops of the sewing part. was there

  Therefore, as a high-strength base fabric panel, for example, measures such as increasing the base fabric thickness or increasing the number of sewing laps will be adopted.For this reason, the folded shape of the airbag is bulky, The storage case body must be increased in size, which ultimately increases the cost.

  In view of this point, the present invention is not limited to using a high-strength base fabric panel, a reinforcing cloth, or a high-strength sewing thread. An object of the present invention is to provide a vehicle airbag in which the portion prevents misalignment so that gas leakage does not occur from the sewing portion, and the base fabric panel and the sewing thread do not break.

  The vehicle airbag according to claim 1 of the present invention is a vehicle airbag formed by forming a bag-like airbag body by binding a peripheral edge portion of a base fabric panel. An inward position is sewed annularly from the peripheral binding portion, and a closed annular sewing portion is formed by intersecting the sewing start point terminal portion and the sewing end point terminal portion, and the sewing start point terminal portion and the sewing end point terminal portion. Is arranged to extend to the inside of the closed annular sewing portion.

  With the above configuration, the sewing start point terminal portion and the sewing end point terminal portion in the closed loop sewing portion intersect each other, and the sewing start point terminal portion and the sewing end point terminal portion are arranged to extend to the inside of the closed loop sewing portion. When the airbag body is inflated and deployed, the inside of the ring surrounded by the closed annular sewing portion is a portion that is not inflated and deployed, and no tensile force is applied to the sewing start point terminal portion and the sewing end point terminal portion. Without causing misalignment or breakage in the sewing portion, the cross-sewn portion of the sewing start point terminal portion and the sewing end point terminal portion is formed by simply intersecting the sewing start point terminal portion and the sewing end point terminal portion. Thus, many needle holes as in the prior art are not concentrated, and the breakage of the base fabric panel constituting the airbag body can be reliably prevented.

  For this reason, it is not necessary to use a thick base fabric or a high-strength sewing thread for the base fabric panel, and it is not necessary to carry out the sewing loops of the closed annular sewing portion multiple times. Contributes to reduction.

  According to a second aspect of the present invention, there is provided a vehicle airbag according to the first aspect, wherein the sewing start point terminal portion and the sewing end point terminal portion of the closed annular sewing portion are close to each other on the inner side of the closed annular sewing portion. It is characterized by being sewn so as to be polymerized.

  Even if the sewing start point terminal portion and the sewing end point terminal portion of the closed loop sewing portion are close to each other or overlap each other due to the above configuration, the proximity portion and the overlap portion exist in the ring of the closed loop sewing portion, and the airbag When the main body is inflated and deployed, the inside of the ring surrounded by the closed annular sewing portion is a portion that is closed and does not inflate and expand, so that the breaking strength is high, and the sewing thread at the sewing start point terminal and the sewing end point terminal Fraying and the like can be reliably prevented.

  According to a third aspect of the present invention, there is provided a vehicular airbag according to the first or second aspect, wherein the sewing start point terminal portion and the sewing end point terminal portion of the closed annular sewing portion are opposed to the cross-sewn sewing portion. It arrange | positions in the position to perform.

  According to the above configuration, a cross-sewn portion is formed by sewing the sewing start point terminal portion and the sewing end point terminal portion of the closed annular sewing portion so as to intersect each other, and the closed annular sewing portion is included in the ring of the closed annular sewing portion. When the airbag body is inflated and deployed, the inside of the ring surrounded by the closed annular sewing portion is a closed annular portion that is not inflated and deployed, so that the breaking strength is high, and the sewing start point terminal portion and the sewing It is possible to reliably prevent the sewing thread from fraying at the end terminal portion.

  According to the vehicle airbag of the present invention, the sewing start point terminal portion and the sewing end point terminal portion of the closed annular sewing portion intersect each other, and the sewing start point terminal portion and the sewing end point terminal portion extend to the inside of the closed annular sewing portion. Therefore, when the airbag body is inflated and deployed, the inside of the ring surrounded by the closed annular sewing portion is a portion that is not inflated and deployed, and a tensile force is applied to the sewing start point terminal portion and the sewing end point terminal portion. There will be no misalignment or breakage in the closed annular sewing portion, and the sewing start point terminal portion and the sewing end point terminal portion simply intersect the sewing start point terminal portion and the sewing end point terminal portion. Therefore, many needle holes as in the conventional case are not concentrated, and it is possible to reliably prevent the breakage of the base fabric panel constituting the airbag body. That.

  For this reason, it is not necessary to use a thick base fabric or a high-strength sewing thread for the base fabric panel, and it is not necessary to carry out the sewing loops of the closed annular sewing portion multiple times. Contributes to reduction.

  First, Embodiment 1 of the present invention will be described with reference to FIGS.

  FIG. 1 is a perspective view of a vehicle seat when an airbag is inflated and deployed when the present invention is applied to a side airbag device, and FIG. 2 is a partially enlarged view of the vicinity of a closed annular sewing portion of the airbag in FIG. FIG. 3 is a schematic sectional view taken along line AA in FIG.

  As shown in FIG. 1, the side airbag device 1 is inflated and deployed between a door glass and an occupant (both not shown) from the side portion of the seat bag 2 a of the seat device 2 on which the occupant sits. Thus, the occupant is protected from an impact such as a side collision of the vehicle.

  The airbag main body 3 is configured in a bag shape by configuring the outer peripheral sewing portion 4 by sewing together the outer peripheral portions of the two base fabric panels 3a and 3b, for example.

  Then, as clearly shown in FIG. 2, by closing the two base fabric panels 3 a and 3 b in an annular manner inside the outer peripheral sewing portion 4 in the airbag body 3, a closed annular sewing portion 5 ( This is equivalent to the conventional circular sewing part), and the thickness of the airbag body 3 in the inflated and deployed shape is regulated to some extent, so that it can be smoothly deployed even in a narrow portion between the seat back 2 and the door glass. I can do it.

  After forming the cross-sewn portion 5c by sewing the sewing start point terminal portion 5a and the sewing end point terminal portion 5b of the closed annular sewing portion 5 so as to cross each other, the closed annular sewing portion 5 is further extended and closed. It is configured in an annular shape.

  Further, the sewing start point terminal portion 5a and the sewing end point terminal portion 5b after the cross-sewn portion 5c are configured to extend and be arranged in the ring 6 surrounded by the closed annular sewing portion 5.

  With this configuration, the sewing start point terminal portion 5a and the sewing end point terminal portion 5b in the closed annular sewing portion 5 intersect with each other, and the sewing start point terminal portion 5a and the sewing end point terminal portion 5b extend to the inside of the closed annular sewing portion 5. Therefore, when the airbag body 3 is inflated and deployed, the inside of the ring surrounded by the closed annular sewing portion 5 is a portion that is not inflated and deployed, and the sewing start point terminal portion 5a and the sewing end point terminal portion 5b The pulling force is not applied, and there is no misalignment or breakage in the closed annular sewing portion 5, and the cross sewing portion 5c between the sewing start point terminal portion 5a and the sewing end point terminal portion 5b is simply the sewing start point terminal portion 5a. Is formed by intersecting the sewing end point portion 5b, so that many needle holes do not concentrate as in the prior art, and the airbag book constituting the airbag body 3 Base cloth panel 3a constituting the three, it is possible to reliably prevent the breakage of 3b.

  For this reason, it is not necessary to use a thick base fabric or a high-strength sewing thread for the base fabric panels 3a and 3b, and it is not necessary to perform the sewing loop of the closed annular sewing portion in layers. In addition, it contributes to cost reduction.

  4 to 6 show another embodiment according to the present invention.

  In the second embodiment shown in FIG. 4, the sewing start point terminal portion 5a and the sewing end point terminal portion 5b are closed in the ring 6 in the closed annular sewing portion 5 as compared with the first embodiment. After being extended and stitched so as to be attached to the annular sewing portion 5, they are configured to face each other close to each other, and the sewing start point terminal portion 5a and the sewing end point terminal portion 5b are arranged at positions facing the cross sewing portion 5c. ing.

  With this configuration, even if the sewing start point terminal portion 5a and the sewing end point terminal portion 5b of the closed annular sewing portion 5 are close to each other, the sewing start point terminal portion 5a and the sewing end point terminal portion 5b after the cross sewing portion 5c are closed. Since it exists in the ring 6 surrounded by the sewing part 5, the facing proximity part 5e of the sewing start point terminal part 5a and the sewing end point terminal part 5b also exists in the ring 6 of the closed annular sewing part 5, and the air Since the inner ring 6 surrounded by the closed annular sewing portion 5 when the bag body 3 is inflated and deployed is a portion that does not inflate and deploy, the breaking strength is high, and the sewing thread at the sewing start point terminal portion 5a and the sewing end point terminal portion 5b. Fraying etc. can be reliably prevented.

  In the third embodiment shown in FIG. 5, as in the second embodiment, the sewing start point terminal portion 5a and the sewing end point terminal portion 5b are closed in the ring 6 in the closed ring sewing portion 5. Although the sewing is extended so as to be attached to the sewing portion 5, it is different in that it is a superposed portion 5 f formed by superimposing each other, but the sewing start point terminal portion 5 a and the sewing end point terminal portion after the cross sewing portion 5 c are different. This is the same in that 5b is present in the ring 6 surrounded by the closed loop sewing portion 5.

  With this configuration, even if the sewing start point terminal portion 5a and the sewing end point terminal portion 5b of the closed loop sewing portion 5 are overlapped with each other, the overlapping portion 5f of the sewing start point terminal portion 5a and the sewing end point terminal portion 5b is 5, the inner ring 6 in the closed annular sewing portion 5 is a portion that is not inflated and deployed when the airbag main body 3 is inflated and deployed. Therefore, the breaking strength is high, and the sewing start point terminal portion 5a. Further, fraying of the sewing thread at the sewing end point terminal portion 5b can be reliably prevented.

  In the fourth embodiment shown in FIG. 6, after the sewing start point terminal portion 5a and the sewing end point terminal portion 5b of the closed annular sewing portion 5 are crossed in the ring 6 to form the cross sewing portion 5c, 6, the sewing start point terminal portion 5 a and the sewing end point terminal portion 5 b are attached to the closed annular sewing portion 5 to form the inner annular sewing portion 7, and then the second cross sewing portion 5 g is formed. Opposite proximity portions 5e are formed in close proximity to each other.

  Therefore, in the ring 6 of the closed ring sewing portion 5, a so-called double (multiple) closed ring in which, in addition to the cross sewing portion 5c, the inner ring sewing portion 7, the second cross sewing portion 5g, and the opposed proximity portion 5e are present. Further, the sewing start point terminal portion 5a and the sewing end point terminal portion 5b after the cross sewing portion 5c are surrounded by the closed circular sewing portion 5 together with the second cross sewing portion 5g and the inner circular sewing portion 7. Since the inner ring 6 of the closed annular sewing portion 5 is a portion that is not inflated and deployed when the airbag body 3 is inflated and deployed, the breaking strength is high and the sewing is performed. It is possible to surely prevent the sewing thread from fraying at the starting point terminal portion 5a and the sewing end point terminal portion 5b.

  In any of the above embodiments, the closed annular sewing portion 5 includes two base fabric panels 3a constituting the airbag body 3 in order to restrict the thickness of the airbag body 3 in the inflated and deployed shape to some extent. However, the present invention is not limited to this. For example, when the closed annular sewing portion 5 is used for reinforcing the peripheral portion of the inflator mounting hole or the vent hole, the air is not limited to this. The bag body 3 may be formed on only one of the plurality of base fabric panels 3a and 3b, and in this case, a reinforcing fabric different from the base fabric panels 3a and 3b is added and co-sewn. There is also a case.

  When the closed annular sewing portion 5 is used to reinforce the peripheral portion of the inflator mounting hole or the vent hole, a through hole is formed in the ring 6 of the closed annular sewing portion 5. At the time of forming this through hole, at least the cross sewing portion 5c formed by crossing the sewing start point terminal portion 5a and the sewing end point terminal portion 5b of the closed annular sewing portion 5 is excised by drilling the through hole. It is configured not to be.

  In the said embodiment, although the airbag main body 3 was formed in the bag shape by forming the outer periphery sewing part which is a periphery binding part in the periphery of two base fabric panels, it is not limited to this. Of course, it may be formed into a bag shape by forming the peripheral binding portion by binding the peripheral portion when weaving one base fabric panel.

  In the airbag of the present invention, the sewing start point terminal portion and the sewing end point terminal portion in the closed annular sewing portion intersect with each other, and the sewing start point terminal portion and the sewing end point terminal portion extend to the inside of the closed annular sewing portion. Therefore, when the airbag body is inflated and deployed, the inside of the ring surrounded by the closed annular sewing portion is a portion that is not inflated and deployed, and no tensile force is applied to the sewing start point terminal portion and the sewing end point terminal portion. The cross-sewn portion between the sewing start point terminal portion and the sewing end point terminal portion is formed by simply intersecting the sewing start point terminal portion and the sewing end point terminal portion without causing misalignment or breakage in the closed annular sewing portion. Therefore, many needle holes as in the prior art are not concentrated, and the breakage of the base fabric panel constituting the airbag body can be reliably prevented.

  For this reason, it is not necessary to use a thick base fabric or a high-strength sewing thread for the base fabric panel, and it is not necessary to carry out the sewing loops of the closed annular sewing portion multiple times. Contributes to reduction.

  Therefore, the present invention is particularly suitable for a vehicle airbag that is a passenger protection device such as a side airbag device, an airbag device for a driver's seat, a passenger airbag device, a knee airbag device, and a curtain airbag device. is there.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle seat when an airbag is inflated and deployed when employed in a side airbag device employing a first embodiment according to the present invention. FIG. 2 is a partially enlarged plan view illustrating an enlarged vicinity of a closed annular sewing portion of the airbag in FIG. 1. It is a schematic sectional drawing in the AA line in FIG. It is the elements on larger scale similar to FIG. 2 in the airbag which employ | adopted 2nd Embodiment based on this invention. It is the elements on larger scale similar to FIG. 2 in the airbag which employ | adopted 3rd Embodiment which concerns on this invention. It is the same partial expanded plan view as FIG. 2 in the airbag which employ | adopted 4th Embodiment based on this invention.

Explanation of symbols

1 Side airbag device (vehicle airbag)
3 Airbag body 3a, 3b Base fabric panel 4 Peripheral sewing part (peripheral binding part)
5 closed annular sewing portion 5a sewing start point terminal portion 5b sewing end point terminal portion 5c cross sewing portion 5e opposed proximity portion 5f overlapping portion 5g second cross sewing portion

Claims (3)

A vehicular airbag comprising a bag-like airbag body by binding the peripheral edge of a base fabric panel, wherein the inner position is sewn in an annular form from the peripheral binding portion of the airbag main body, and the sewing is performed A closed loop sewing portion is formed by intersecting the start point terminal portion and the sewing end point terminal portion, and the sewing start point terminal portion and the sewing end point terminal portion are arranged to extend to the inside of the closed ring sewing portion. A vehicle airbag characterized. The vehicle airbag according to claim 1, wherein the sewing start point terminal portion and the sewing end point terminal portion of the closed annular sewing portion are sewn so as to face each other or overlap each other inside the closed annular sewing portion. The vehicle airbag according to claim 1 or 2, wherein a sewing start point terminal portion and a sewing end point terminal portion of the closed annular sewing portion are disposed at positions facing the cross sewing portions of the two.

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