JP6571473B2 - Airbag - Google Patents

Description

  The present invention relates to an airbag.

  Conventionally, an airbag that protects an occupant from an impact when a vehicle such as an automobile collides is known (for example, Patent Document 1).

  The airbag described in Patent Document 1 includes a so-called variable vent hole whose opening state changes corresponding to the internal pressure of the airbag body. The variable vent hole has a plurality of vent holes formed in the airbag body, a flap provided in the airbag body, and a tether that connects the airbag body and the flap.

  During normal deployment of the airbag body, the tether fixed to the flap moves in the inflating direction as the airbag body is deployed, and the flap covers a plurality of vent holes formed in the airbag body. It will not be exhausted outside.

  In the airbag described in Patent Literature 1, the hole shape of the vent hole is formed in a square shape, and the shortest distance between the square corners of the vent hole adjacent to the extending direction of the tether when the airbag main body is deployed. It is set to become.

U.S. Pat. No. 8,172,260

  In the airbag described in Patent Document 1, the frame portion between the vent holes adjacent to the extending direction of the tether when the airbag main body is deployed (more specifically, the vent hole) due to the tension acting when the airbag main body is deployed. A large stress concentrates on the frame portion between the corners of the quadrangle that forms the shape. In such a case, in order to ensure the durability of the desired airbag, it is necessary to increase the interval between the vent holes, and the flap covering the plurality of vent holes becomes large, resulting in the entire variable vent hole. There is a problem that becomes larger.

  Therefore, an object of the present invention is to ensure the durability of a desired airbag while suppressing an increase in size of the variable vent hole.

An airbag according to the present invention includes an airbag body and a variable vent hole provided in the airbag body. The variable vent hole includes a plurality of vent holes formed in the airbag body, a flap provided in the airbag body, and a tether that connects the airbag body and the flap. Hole shape of the vent hole, the number of the angular positive polygon is formed on the positive even number polygon with an even number, the plurality of the vent holes, adjacent to the extending direction of the tether during deployment of the air bag body wherein said definitive vent hole side among the positive even number square is provided along the direction perpendicular to a running direction of the tether so as to be parallel to each other to be formed.

  In the airbag according to the present invention, the hole shape of the vent hole is formed in an even number of squares, and the distance between the sides of the even number of squares is determined for the vent holes adjacent to the extending direction of the tether when the airbag body is deployed. , The lengths of the sides are set to be equivalent.

  By doing so, stress is dispersed in a wide range in the frame portion between the vent holes adjacent to each other in the extending direction of the tether, and stress concentration is relaxed. For this reason, it is not necessary to increase the interval between the vent holes, and it is also possible to set the interval between the vent holes to be smaller.

  Therefore, according to the airbag which concerns on this invention, durability of the desired airbag can be ensured, suppressing the enlargement of a variable vent hole.

It is a perspective view which shows the time of expansion | deployment of the airbag which concerns on embodiment of this invention. It is a side view of the airbag which shows the state at the time of expansion | deployment of an airbag main body. It is a side view of the airbag which shows the state at the time of accommodation of an airbag main body. It is a disassembled perspective view of a variable vent hole. It is explanatory drawing which shows the staggered arrangement | positioning of a vent hole. It is explanatory drawing which shows the modification of arrangement | positioning of a vent hole. It is explanatory drawing which shows the modification of the hole shape of a vent hole.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1 to FIG. 3, the airbag 10 is configured as a passenger seat airbag, and is folded into an airbag body 12 housed in an instrument panel 11 and an airbag body 12. And an inflator 13 that is filled with gas. 2 and 3, reference numeral 14 indicates a windshield of the vehicle.

  The airbag main body 12 is formed in a bag shape by joining a pair of main panels 15 and 15 formed in the same shape and a center panel 16 disposed between the pair of main panels 15 and 15 by sewing or the like. Is formed. The main panel 15 and the center panel 16 are formed of, for example, an airbag base fabric.

  The inflator 13 is connected to an electronic control unit (not shown) and is controlled based on a detection value of an acceleration sensor or the like. When the electronic control unit detects or predicts a vehicle collision or the like, the electronic control unit activates the inflator 13 to fill the air bag body 12 with gas from the inflator 13.

  A pair of main panels 15 and 15 in the airbag main body 12 are provided with a fixed vent hole 17 and a variable vent hole (variable vent mechanism) 18, respectively.

  The fixed vent hole 17 is an opening state (opening area) that does not change when the airbag body 12 is deployed. On the other hand, the opening state (opening area) of the variable vent hole 18 changes corresponding to the internal pressure of the airbag main body 12 at the time of deployment. The variable vent hole 18 is provided in the airbag body 12 for the purpose of improving OOP (out-of-position) performance.

  As shown in FIG. 4, the variable vent hole 18 includes a plurality of vent holes 19 formed in the airbag body 12, a flap (valve element) 20 provided in the airbag body 12 in a folded state, and an airbag. And a tether 21 for connecting the main body 12 and the flap 20.

  A sub panel 22 is provided on the inner surface of the main panel 15 of the airbag body 12. The sub panel 22 is coupled to the main panel 15 by sewing or the like so as to sandwich one end of the flap 20. The other end of the flap 20 is coupled to the center panel 16 via a tether 21. The flap 20, the tether 21, and the sub panel 22 are formed of a base fabric made of the same material as the main panel 15 and the center panel 16, for example.

  A plurality of through holes 23 are densely provided in the main panel 15 of the airbag body 12, and a plurality of through holes 24 having the same shape and the same dimensions as the through holes 23 of the main panel 15 are also densely arranged in the sub panel 22. Is provided. These through holes 23 and 24 constitute a vent hole 19.

  The hole shape of the vent hole 19 is formed into an even-numbered polygon having an even number of corners among polygons. In the present embodiment, the hole shape of the vent hole 19 is formed in a regular square as shown in FIG.

  The vent hole 19 adjacent to the extending direction E of the tether 21 when the airbag body 12 is deployed is configured such that the distance D between the rectangular sides 25 is equal in the length direction of the side 25. Is done. That is, the plurality of vent holes 19 are formed so that the vent holes 19, 19 adjacent to each other in the extending direction E of the tether 21 when the airbag body 12 is deployed are parallel to each other.

  In the present embodiment, when viewed from the extending direction E of the tether 21 when the airbag body 12 is deployed, the vent hole 19 and the frame portion 26 between the vent holes 19, 19 in the airbag body 12 are It is configured to be arranged alternately. For this reason, the vent holes 19 are arranged in a staggered manner with respect to the extending direction E of the tether 21 when the airbag body 12 is deployed. Further, a plurality of vent holes 19 are formed so that the vent holes 19 always exist when viewed from the extending direction E of the tether 21 when the airbag body 12 is deployed.

  Next, the operation of the airbag 10 according to this embodiment will be described.

  When an electronic control unit (not shown) detects or predicts a vehicle collision or the like, the inflator 13 is activated, and the airbag body 12 is filled with gas. The airbag main body 12 is inflated by the gas filled in the airbag main body 12 in a folded state, and is deployed from the instrument panel 11 toward the passenger seat. When the airbag body 12 is deployed, a tension T is generated in the airbag body 12 (see FIG. 5).

  When there is no obstacle in the vicinity of the airbag 10, the tether 21 coupled to the flap 20 moves to the passenger seat side with the deployment of the airbag body 12, so that a plurality of flaps 20 are formed on the airbag body 12. The vent hole 19 is covered. For this reason, the gas is not exhausted to the outside of the airbag body 12, and the airbag body 12 is normally deployed, and finally, the gas inside the airbag body 12 is exhausted from the fixed vent hole 17.

  On the other hand, when the obstacle is in a state of being close to the airbag 10, the obstacle suppresses the deployment of the airbag body 12 at the initial stage of deployment of the airbag body 12. The state where the plurality of vent holes 19 are opened is maintained. For this reason, the gas filled in the airbag main body 12 is exhausted from the vent hole 19, and the deployment of the airbag main body 12 is completed in a state where the deployment force of the airbag main body 12 is suppressed.

  Below, the effect by this embodiment is demonstrated.

  (1) The airbag 10 according to this embodiment includes an airbag body 12 and a variable vent hole 18 provided in the airbag body 12. The variable vent hole 18 has a plurality of vent holes 19 formed in the airbag body 12, a flap 20 provided in the airbag body 12, and a tether 21 that connects the airbag body 12 and the flap 20. The hole shape of the vent hole 19 is formed into an even-numbered polygon having an even number of corners among polygons. Further, regarding the vent hole 19 adjacent to the extending direction E of the tether 21 when the airbag body 12 is deployed, the distance D between the even-angled sides 25 and 25 is the same in the length direction of the side 25. .

  In the airbag 10 according to this embodiment, the hole shape of the vent hole 19 is formed to be an even-numbered square, and the vent hole 19 adjacent to the extending direction E of the tether 21 when the airbag main body 12 is deployed is even-numbered. The distance D between the sides 25 and 25 is set to be equal in the length direction of the side 25.

  By doing so, the stress is dispersed in a wide range in the frame portion 26 between the vent holes 19 and 19 adjacent to each other in the extending direction E of the tether 21, and the stress concentration is relaxed. For this reason, it is not necessary to make the space | interval of vent holes 19 and 19 large, and it also becomes possible to set the space | interval of vent holes 19 and 19 smaller.

  Therefore, according to the airbag 10 according to the present embodiment, it is possible to ensure the durability of the desired airbag 10 while suppressing an increase in the size of the variable vent hole 18.

  (2) When viewed from the extending direction E of the tether 21 when the airbag main body 12 is deployed, the vent holes 19 and the frame portions 26 between the vent holes 19 and 19 in the airbag main body 12 are alternately arranged. It is configured to be arranged.

  By arranging the vent hole 19 in this way, the frame portion 26 between the vent holes 19 and 19 in the airbag body 12 when viewed from the extending direction E of the tether 21 when the airbag body 12 is deployed. Branches to the left and right, so that the tension T acting on the frame portion 26 can be dispersed.

  By the way, although the airbag of the present invention has been described by taking the above embodiment as an example, the present invention is not limited to this embodiment, and various other embodiments can be adopted without departing from the gist of the present invention.

  For example, the airbag 10 is not limited to a passenger airbag, and may be configured as a driver airbag. Further, the vent holes 19 are not limited to the staggered arrangement shown in FIG. 5, and may be arranged as shown in FIG. 6. Furthermore, the hole shape of the vent hole 19 may be an even-numbered polygon having an even number of corners among polygons, and may be a hexagon or an octagon as shown in FIG.

DESCRIPTION OF SYMBOLS 10 Airbag 12 Airbag main body 18 Variable vent hole 19 Vent hole 20 Flap 21 Tether 25 Even square side 26 Airbag main body frame D Distance between even square sides E Extension direction of tether

Claims (2)

An airbag body,
A variable vent hole provided in the airbag body,
The variable vent hole is
A plurality of vent holes formed in the airbag body;
A flap provided on the airbag body;
A tether that connects the airbag body and the flap;
Hole shape of the vent hole, the number of the angular positive polygon is formed on the positive even number polygon with an even number,
A plurality of said vent hole, said the positive even number polygonal sides each other definitive in the vent hole adjacent to the extending direction of the tether during deployment of the air bag body along a direction perpendicular to a running direction of the tether An airbag characterized in that the airbag is formed so as to be parallel to each other .   The vent holes and the frame portions between the vent holes in the airbag body are alternately arranged when viewed from the extending direction of the tether when the airbag body is deployed. The airbag according to claim 1, wherein