JP6110723B2 - Side airbag and side airbag device - Google Patents

Description

The present invention relates to a side airbag and a side airbag device , and more particularly to a side airbag that is inflated and deployed between an occupant and a door portion, and a side airbag device including the side airbag .

  It has become common for vehicles such as automobiles to be equipped with an airbag device for inflating and deploying an airbag in the vehicle in the event of an emergency such as a collision or sudden deceleration to absorb the impact generated on the passenger. Yes. Such an airbag apparatus generally includes an airbag that is normally folded and accommodated in a vehicle structure and inflated and deployed in an emergency, and an inflator that supplies gas to the airbag.

  For example, a side airbag that is inflated and deployed between an occupant and a door portion is built in the back surface (seat back) of a seat (seat) on which the occupant sits, and the seat (seat) is installed at the time of a vehicle collision or sudden deceleration It breaks or pushes away and is released into the vehicle forward. In such a side airbag device, there has already been proposed a method for suppressing an increase in internal pressure when normal inflation and deployment of the airbag is inhibited (see, for example, Patent Document 1 and Patent Document 2).

Airbag device disclosed in Patent Document 1 is used, the number and the vent hole formed in the corner portion of the lower bag, the fabric material which hole is formed which has a size and shape capable of closing the 該Be Ntohoru, the In a state where the lower bag does not expand to a predetermined shape, the gas is discharged from the lower bag with the position of the through hole coincident with the position of the vent hole. On the other hand, when the lower bag is expanded to a predetermined shape, a tension greater than a predetermined value acts on the cloth material, the tear seam portion is broken, the through hole moves forward, and the cloth material closes the vent hole. .

  The airbag apparatus described in Patent Document 2 is disposed around a side panel that forms an outer surface of a side airbag and delimits a vent hole for releasing gas to the outside of the side airbag. And a closure panel configured to prevent the vent holes from being closed to release gas during the inflation of the side airbag until the side airbag is substantially fully inflated.

JP 2007-50848 A Special table 2010-535121 gazette

  However, in the airbag device described in Patent Document 1 and Patent Document 2 described above, the vent hole (vent hole) is set to be in an open state in the accommodated state before the airbag is inflated and deployed. In the initial stage of deployment, the vent hole (vent hole) is held in an open state, and when the airbag reaches a predetermined internal pressure, the vent hole (vent hole) is switched to a closed state. Therefore, in the initial stage of inflation and deployment of the airbag, there is a problem that wasteful gas that does not contribute to the inflation and deployment of the airbag is generated and the inflator is enlarged.

The present invention was devised in view of such problems, and a side airbag and a side airbag that can effectively suppress an increase in internal pressure when normal inflation and deployment of the side airbag is inhibited. An object is to provide an apparatus .

According to the present invention, in a side airbag that is normally folded and accommodated in a vehicle structure and is inflated and deployed between an occupant and a door portion in an emergency, the bag body is sewn. A main panel that is formed in the main panel, a normally-open vent hole that is always kept open, and a part of the main panel is folded and sewn together when the main panel is stitched. A gather hole and a vent hole formed in a portion covered by the gather section, and the vent hole is closed by the gather section during normal expansion and deployment without receiving external force from the outer edge of the main panel. Holding and releasing the gathered part from being in close contact with the main panel when an external force is received from the outer edge part of the main panel during inflation and deployment. Wherein being configured to shift the vent hole in an open state, the side air bag is provided, characterized in that I.

Further, according to the present invention, the side airbag that is normally folded and accommodated in the vehicle structure and inflated and deployed between the occupant and the door in an emergency, and gas is supplied to the side airbag. In the side airbag device having the inflator, the side airbag is sewn to form a main body that forms a bag body, a normally open vent hole that is formed in the main panel and always maintains an open state, comprising a gather portion to be sewn upon sewing of the main panel while being formed by folding a part of the main panel, a vent hole formed in a portion that is covered by the gathering portion, of the main panel During normal expansion and deployment without receiving external force from the outer edge, the gather hole holds the vent hole in a closed state so that the main panel is inflated and deployed. Side air bag, characterized in that, which is configured to migrate the vent hole in an open state by the gather portion be released from a state of close contact with the main panel when receiving an external force from the outer edge of An apparatus is provided.

In the airbag and the airbag apparatus described above, the gather portion may have at least one mountain portion and at least one valley portion. Moreover, the said gathers part may include the part in which the said peak part and the said trough part continued alternately, and the said peak part or the said trough part was formed continuously. Further, the gather section, rectangular shape, but it may also be formed in a triangular shape or a trapezoidal shape.

According to the side airbag and the side airbag apparatus according to the present invention described above, the gather portion formed on a part of the main panel constituting the side airbag, by arranging the vent hole on the inside, side airbags Is normally inflated and deployed, the gather portion can be kept in close contact with the surface tension of the main panel, and the vent hole can be kept closed. On the other hand, when the side airbag receives an external force from the outer edge portion and cannot normally be inflated and deployed, the surface tension of the main panel is lowered, the gather portion is relaxed, and the vent hole can be switched to the open state.

Therefore, when the side airbag is normally inflated and deployed, the vent hole can be maintained in the closed state from the start to the completion of the inflation and deployment, and when the side airbag receives an external force from the outer edge, immediately The vent hole can be switched to the open state, and when the normal inflation and deployment of the side airbag is inhibited, the increase in internal pressure can be effectively suppressed.

It is a component expanded view which shows the airbag apparatus which concerns on 1st embodiment of this invention. It is a figure which shows the airbag shown in FIG. 1, (A) is a top view, (B) is BB sectional drawing in FIG. 2 (A), (C) has shown the modification. FIGS. 2A and 2B are diagrams showing an inflating and deploying stage of the airbag device shown in FIG. 1, in which FIG. 1A shows a stage before inflating and deploying, FIG. 1B shows an inflating and deploying completion stage, and FIG. It is sectional drawing which shows the expansion | deployment deployment state of an airbag, (A) is AA sectional drawing in FIG.3 (B), (B) has shown BB sectional drawing in FIG.3 (C). It is a top view which shows the airbag which concerns on other embodiment of this invention, (A) is 2nd embodiment, (B) is 3rd embodiment, (C) is 4th embodiment, (D) is 1st embodiment. 5 shows a fifth embodiment. It is the elements on larger scale which show the airbag which concerns on other embodiment of this invention, (A) is 6th embodiment, (B) is 7th embodiment, (C) is 8th embodiment, (D) is 9th Embodiment, (E) 10th Embodiment is shown.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is an exploded view showing the airbag apparatus according to the first embodiment of the present invention. 2A and 2B are diagrams showing the airbag shown in FIG. 1, wherein FIG. 2A is a plan view, FIG. 2B is a sectional view taken along line BB in FIG. 2A, and FIG. Yes. FIG. 3 is a diagram showing an inflating and deploying stage of the airbag device shown in FIG. 1, wherein (A) is a stage before inflating and deploying, (B) is an inflating and deploying completion stage, and (C) is an inflating and deploying intermediate stage. Show. 3A to 3C, for convenience of explanation, the airbag 1 shows a surface on the occupant side, and the seat S is shown by a one-dot chain line.

  As shown in FIGS. 1 to 3, the airbag device according to the first embodiment of the present invention is normally folded and accommodated in a vehicle structure and is inflated and deployed in an emergency. And an inflator 2 for supplying gas to the airbag 1. The airbag 1 is formed by folding a pair of main panels 11 and 12 that are stitched together to form a bag body, and a part of the main panel 12. It has a gathered portion 3 that is formed and is sewn together when the main panel 12 is stitched, and a vent hole 4 formed in a portion covered by the gathered portion 3.

  The airbag device described above is, for example, a side airbag device that is inflated and deployed between an occupant and a door portion, as shown in FIGS. 3A and 3B. Seats and seats such as passenger seats) and rear seats. Specifically, the airbag 1 is accommodated in the airbag case 5 in a folded state, and is fixed in a side portion on the door portion side of the seat S.

  The inflator 2 is a gas generator that generates gas supplied to the airbag 1 and has, for example, a substantially cylindrical outer shape. The inflator 2 is connected to a mounting portion formed on the airbag 1 by a fastener (not shown) such as a bolt and is housed in the airbag case 5 together with the airbag 1. When stored in the airbag case 5, the airbag 1 is folded by a predetermined folding method (such as bellows folding, roll folding, or a combination thereof), and the inflator 2 is fixed to the airbag case 5.

  The inflator 2 is connected to an ECU (electronic control unit) (not shown) and is controlled based on measurement values of an acceleration sensor or the like. When the ECU senses a vehicle collision or sudden deceleration, the inflator 2 is ignited by an ignition current from the ECU, burns the chemical stored in the inflator 2, generates gas, and supplies the gas to the airbag 1. . The airbag 1 starts inflating and deploying in the airbag case 5, and is released into the vehicle by breaking or pushing away a planned tearing portion (not shown) formed in the seat S.

  As shown in FIG. 1, the airbag 1 is formed by overlapping a pair of main panels 11 and 12 that can form the outer shape of the airbag 1 and stitching the outer periphery thereof. For example, a normally open vent hole 11a is formed in the main panel 11 disposed on the door portion side, and a gather portion 3 is formed on the main panel 12 disposed on the passenger side. The main panels 11 and 12 may be formed of a single base fabric, and folded and stitched together to form the airbag 1 that is a bag.

  The normally open vent hole 11a is an opening that always keeps an open state, and relieves an impact when the occupant comes into contact with the airbag 1. The normally open vent hole 11a may be omitted depending on the type and shape of the airbag 1, or may be formed in the main panel 12 on the occupant side, or a clearance between the stitched portions of the main panels 11 and 12 is used. May be formed. The arrangement and shape of the normally open vent hole 11a are not limited to those illustrated.

  As shown in FIGS. 1, 2 </ b> A and 2 </ b> B, the gather portion 3 has at least one peak portion 3 a and at least one valley portion 3 b. The crest 3a is formed by folding the main panel 12 inward along the broken line La shown in FIG. The valley portion 3b is formed by folding the main panel 12 outward along the broken line Lb shown in FIG. For example, the broken lines La and Lb are arranged along the front-rear direction of the airbag 1.

  Such a folding method may be referred to as Z-shaped folding, bellows folding (one mountain), pleated folding, mountain valley folding, or the like. With such a configuration, a pleated gather portion 3 formed by the peak portion 3a and the valley portion 3b is formed. Here, the rectangular gather part 3 is formed by folding back the main panel 12 to a uniform width.

  Further, the end portions of the gather portion 3 located on the stitching portion 13 indicated by broken lines along the outer peripheries of the main panels 11 and 12 are stitched together (sewed together) with the main panels 11 and 12 by the suture thread. With such a configuration, the gather part 3 can be formed in a pocket shape, and by changing the depth of the pocket part, that is, the interval between the peak part 3a and the valley part 3b, the gather part 3 is difficult to roll (or twist). Ease) can be arbitrarily changed. For example, when the depth of the pocket portion is shallow (the interval between the peak portion 3a and the valley portion 3b is narrow), the gather portion 3 can be easily drawn, and the depth of the pocket portion is deep (the peak portion 3a and the valley portion 3b). In the case where the interval between the portions 3b is wide), it is possible to make the gather portion 3 difficult to roll.

  A vent hole 4 is formed inside the gather portion 3 as shown in FIG. As shown in FIG. 2B, the vent hole 4 may be formed in the main panel 12 (the portion between the peak portion 3a and the valley portion 3b) that constitutes the folds of the gather portion 3. As shown to (C), you may form in the main panel 12 (part under the trough part 3b) coat | covered with the pleat of the gather part 3. FIG. Thus, by forming the vent hole 4 in the portion covered with the gather portion 3, the opening and closing of the vent hole 4 can be controlled depending on whether the gather portion 3 is drowned.

  For example, as shown in FIG. 2A, the vent hole 4 is formed in a circular shape at one place, but is not limited to such a configuration. For example, the number of the vent holes 4 may be increased to two or more as necessary, and the shape of the vent holes 4 may be changed to a shape other than a circular shape. Moreover, if the vent hole 4 is a part covered with the gather part 3, it may be formed in the center part of the airbag 1, and may be formed in the front side or the back side.

  Here, FIG. 4 is a cross-sectional view showing an inflated and deployed state of the airbag, (A) is a cross-sectional view taken along line AA in FIG. 3 (B), and (B) is a cross-sectional view taken along line BB in FIG. 3 (C). FIG. Hereinafter, the transition of the inflation and deployment of the airbag 1 will be described with reference to FIGS. 3 (A) to 3 (C) and FIGS. 4 (A) and 4 (B).

  In the stage before the inflation and deployment of the airbag 1 shown in FIG. 3A, the vent hole 4 is folded and accommodated in the airbag case 5 while being closed by the gather portion 3. As described above, since the gather portion 3 is sewn together with the main panels 11 and 12, the gather portion 3 is in close contact with the main panel 12 before the gas is supplied into the airbag 1. The vent hole 4 is kept closed.

  The inflating and deploying completion stage of the airbag 1 shown in FIG. 3B illustrates a state in which the inflating and deploying of the airbag 1 has been normally inflated and deployed without being obstructed by an occupant or an obstacle. In the present embodiment, “normal inflation and deployment” means “after the airbag 1 is released into the vehicle, it can be inflated and deployed without receiving external force from the outer edge portion”. Further, “not receiving external force from the outer edge” means “not receiving external force from the radial direction when the main panels 11 and 12 are simulated in a circular shape”.

  When the airbag 1 is normally inflated and deployed, it does not receive external force from the outer edge, so that the main panels 11 and 12 are stretched by the internal pressure and generate a certain surface tension. And the surface tension of this main panel 12 will produce tension | tensile_strength in the extending | stretching direction of the broken lines La and Lb with respect to the gather part 3, and the gather part 3 will maintain the state closely_contact | adhered to the main panel 12. FIG. . Therefore, as shown in FIG. 4A, the vent hole 4 is maintained in a closed state. That is, when the airbag 1 is normally inflated and deployed, the vent hole 4 can be maintained in the closed state from the start to the end of the inflation and deployment of the airbag 1, and gas leakage can be suppressed to a minimum. it can.

  By the way, as shown in FIG. 3C, when the obstacle X exists in the seat S when the airbag 1 is inflated and deployed, and the inflation and deployment of the airbag 1 in the forward direction is obstructed, the airbag 1 Cannot receive normal force from the outer edge to perform normal expansion and deployment. At this time, since the main panel 12 cannot be expanded in the direction of receiving an external force, the main panel 12 cannot maintain the tensioned state due to the internal pressure, and the surface tension is reduced. This reduction in the surface tension of the main panel 12 reduces the tension generated in the extending direction of the polygonal lines La and Lb of the gather portion 3, and the gather portion 3 is released from a state of being in close contact with the main panel 12. Become.

  And as shown in FIG.4 (B), the trough part 3b folded inside the gather part 3 is pushed on the surface of the airbag 1 by the internal pressure of the airbag 1, and the gather part 3 is drowned, The vent hole 4 is exposed on the surface of the airbag 1 and shifts to an open state. In addition, in FIG. 4 (B), the position of the gather part 3 formed of the peak part 3a and the trough part 3b is virtually indicated.

  According to the airbag 1 and the airbag apparatus according to the present embodiment described above, the gather portion 3 is formed in a part of the main panel 12 constituting the airbag 1, and the vent hole 4 is disposed inside thereof. When the airbag 1 is normally inflated and deployed, the gather portion 3 can be kept in close contact by the surface tension of the main panel 12, and the vent hole 4 can be kept closed. On the other hand, when the airbag 1 receives an external force from the outer edge portion and cannot normally be inflated and deployed, the surface tension of the main panel 12 is lowered, the gather portion 3 is relaxed, and the vent hole 4 can be switched to the open state. .

  Therefore, when the airbag 1 is normally inflated and deployed, the vent hole 4 can be maintained in the closed state from the start to the completion of the inflation and deployment, and when the airbag 1 receives an external force from the outer edge portion, The vent hole 4 can be immediately switched to the open state, and when normal inflation and deployment of the airbag 1 is inhibited, an increase in internal pressure can be effectively suppressed.

  Next, an airbag 1 according to another embodiment of the present invention will be described with reference to FIGS. 5 and 6. Here, FIG. 5 is a plan view showing an airbag according to another embodiment of the present invention, in which (A) is the second embodiment, (B) is the third embodiment, and (C) is the fourth embodiment. Form, (D) shows the fifth embodiment. FIG. 6 is a partially enlarged view showing an airbag according to another embodiment of the present invention, in which (A) is a sixth embodiment, (B) is a seventh embodiment, (C) is an eighth embodiment, (D) shows a ninth embodiment and (E) a tenth embodiment. In addition, about the same component as 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The airbag 1 according to the second embodiment shown in FIG. 5A is formed by forming a vent hole 4 by a slit (cut portion). According to such a configuration, gas leakage from the main panel 12 can be suppressed to a minimum, and even when there is a slight gap in the gather portion 3, gas leakage can be reduced.

  The airbag 1 which concerns on 3rd embodiment shown to FIG. 5 (B) forms the gather part 3 in the triangle shape. In the present embodiment, the triangular shape includes a substantially sector shape having a curved base. Even with such a configuration, it is possible to arbitrarily set the difficulty (or the ease of drowning) of the gather part 3 by appropriately changing the depth of the gather part 3 (the interval between the peak part 3a and the valley part 3b). .

  Further, in the first embodiment described above, the gather portion 3 is formed in the substantially central portion of the airbag 1, but it may be formed in the upper portion of the airbag 1 as in this embodiment. Moreover, in this embodiment, since the folding part of the gather part 3 is formed in the front part of the airbag 1, it is formed so that the space | interval of the peak part 3a and the trough part 3b goes ahead, The position of the vent hole 4 is also arranged on the front side of the airbag 1. Of course, the folded part of the gather part 3 may be formed in the rear part of the airbag 1, and the vent hole 4 may be arranged on the rear side of the airbag 1.

  The airbag 1 which concerns on 4th embodiment shown to FIG. 5 (C) forms the gather part 3 in trapezoid shape. In the present embodiment, the trapezoidal shape includes a shape in which the upper base or the lower base is curved. Even with such a configuration, it is possible to arbitrarily set the difficulty (or the ease of drowning) of the gather part 3 by appropriately changing the depth of the gather part 3 (the interval between the peak part 3a and the valley part 3b). .

  In the first embodiment to the third embodiment described above, the gather portion 3 is formed in the substantially central portion or the upper portion of the airbag 1, but is formed in the lower portion of the airbag 1 as in this embodiment. You may do it. Moreover, in this embodiment, since the folding part of the gather part 3 is formed in the back part of the airbag 1, it is formed so that the space | interval of the peak part 3a and the trough part 3b goes back, and vent The position of the hole 4 is also arranged on the rear side of the airbag 1. Of course, the folded portion of the gather portion 3 may be formed in the front portion of the airbag 1, and the vent hole 4 may be disposed on the front side of the airbag 1.

  The airbag 1 according to the fifth embodiment shown in FIG. 5 (D) is configured by arranging a broken line La forming a peak 3a and a bent line Lb forming a valley 3b along the vertical direction of the airbag 1. is there. Thus, even if it is a case where the gather part 3 is formed along the up-down direction of the airbag 1, the effect similar to embodiment mentioned above can be exhibited. As can be understood from the first embodiment to the fifth embodiment described above, the arrangement of the broken lines La and Lb is not limited to the front-rear direction or the vertical direction of the airbag 1, but within a range of 360 degrees. It can be set arbitrarily.

  Also in this embodiment, the shape of the gather part 3 may be a rectangular shape, a triangular shape, or a trapezoidal shape. Moreover, the vent hole 4 may be formed in the center part, may be formed in the upper part, may be formed in the lower part, and may be formed in multiple numbers. Moreover, the gather part 3 may be formed in the center part of the airbag 1, may be formed in the front side, and may be formed in the back side.

  In the embodiment shown in FIGS. 6A to 6E, a plurality of gather portions 3 are formed. In each drawing of FIG. 6, for convenience of explanation, the gathered portion 3 formed on the main panel 12 is illustrated in an enlarged manner, but other configurations are the same as those in the above-described embodiment.

  In the sixth embodiment shown in FIG. 6 (A), the first gather portion 31 and the second gather are obtained by folding the main panel 12 so that the mountain portions 31a, 32a and the valley portions 31b, 32b are alternately continuous. A portion 32 is formed. Specifically, after the main panel 12 is folded inward at the peak 31a, the main panel 12 is folded back outward at the valley 31b, folded back again inside the peak 32a, and then folded outward at the valley 32b.

  Accordingly, the first gather portion 31 is formed by the peak portion 31a and the valley portion 31b, and the second gather portion 32 is formed by the peak portion 32a and the valley portion 32b. Alternatively, the first gather portion 31 and the second gather portion 32 may be formed so as not to overlap when the main panel 12 is flattened. With this configuration, an increase in the partial thickness of the airbag 1 can be suppressed, and the airbag 1 can be easily folded. Further, three or more gather portions 3 may be formed by repeating the mountain valleys.

  Further, the first vent hole 41 is formed in the portion covered by the first gather portion 31, and the second vent hole 42 is formed in the portion covered by the second gather portion 32. Here, the first vent hole 41 is formed between the peak portion 31a and the valley portion 31b, and the second vent hole 42 is formed between the peak portion 32a and the valley portion 32b. Is not to be done. Further, the first vent hole 41 and the second vent hole do not have to have the same configuration, and the number may be different, the opening area may be different, and the arrangement location may be different as necessary. May be different.

  In the seventh embodiment shown in FIG. 6B, after gathering a part of the main panel 12, the folded part is further folded, thereby forming the gather part 3 twice. Specifically, after the main panel 12 is folded inward at the peak portion 31a, the main panel 12 is folded back outward at the valley portion 31b, folded back outward at the valley portion 32b, and then folded inward at the peak portion 32a. Therefore, in this embodiment, trough parts 31b and 32b are formed continuously.

  With this configuration, the first gather portion 31 is formed by the mountain portion 31a and the valley portion 31b, and the second gather portion 32 is formed by the valley portion 32b and the mountain portion 32a. Moreover, in this embodiment, the peak part 32a is turned back so that it may approach the trough part 31b, and it forms so that the 1st gather part 31 and the 2nd gather part 32 may be folded up. According to such a configuration, it is possible to make it difficult to drown the gather portion 3 while exhibiting the same effects as those of the first embodiment described above.

  Moreover, although the vent hole 4 is formed between the trough part 31b and the trough part 32b, for example, it is not limited to this structure. For example, the vent hole 4 may be formed between the trough portion 32b and the crest portion 32a, or may be formed between the crest portion 31a and the trough portion 31b. 4 may be formed.

  The eighth embodiment shown in FIG. 6C is substantially the same folding method as the seventh embodiment described above, but when the main panel 12 is flattened, the first gather portion 31 and the second gather. The portion 32 is formed so as not to overlap. That is, in this embodiment, the peak part 32a is folded back so as to approach the peak part 31a.

  According to such a configuration, the valley portion 31b and the valley portion 32b can be confined in the airbag 1, and the gather portion 3 can be made difficult to droop while exhibiting the same effects as those of the first embodiment described above. . Moreover, the increase in the partial thickness of the airbag 1 can be suppressed, and it can be made easy to fold.

  In addition, for example, the first vent hole 41 is formed between the peak portion 31a and the valley portion 31b, and the second vent hole 42 is formed between the valley portion 32b and the peak portion 32a. Is not to be done. For example, the vent hole 4 may be formed between the valley portion 31b and the valley portion 32b.

  The ninth embodiment shown in FIG. 6D is obtained by changing the shape of the vent hole 4 in the above-described eighth embodiment. That is, in this embodiment, it has the 1st gather part 31 and the 2nd gather part 32 which carried out the folding method same as 8th embodiment. And the vent hole 4 formed by the slit (cut | notch part) extended in an up-down direction is arrange | positioned in the position shown with the broken line of the figure.

  According to such a configuration, the gas leakage from the main panel 12 can be minimized while exhibiting the same effects as in the eighth embodiment described above, and the gather portion 3 has a slight gap. Even if it exists, the leak of gas can be reduced.

  Moreover, although the case where the vent hole 4 is formed from the intermediate part of the peak part 31a and the valley part 31b to the intermediate part of the valley part 32b and the peak part 32a is illustrated here, it is limited to this configuration. It is not a thing. For example, you may arrange | position the vent hole 4 formed by the slit (cut | notch part) extended in an up-down direction between the trough part 31b and the trough part 32b. The vent hole 4 may be a slit (cut portion) extending in the front-rear direction (lateral direction).

  In the tenth embodiment shown in FIG. 6 (E), a part of the main panel 12 is folded and then folded back so that the folded part is rolled up, thereby forming the gather part 3 twice. Specifically, after the main panel 12 is folded back at the peak portion 31a, the main panel 12 is folded back to the outside (inner winding) at the peak portion 32a, folded back to the inside at the valley portion 31b, and then folded back to the outside at the valley portion 32b. Yes. Therefore, in the present embodiment, the peak portions 31a and 32a and the valley portions 31b and 32b are formed continuously.

  With this configuration, the first gather portion 31 is formed by the mountain portions 31a and the mountain portions 32a, and the second gather portion 32 is formed by the valley portions 31b and the valley portions 32b. Moreover, this embodiment can also be paraphrased as what turned up the 2nd gather part 32 of 7th Embodiment shown to FIG. 6 (B) in the reverse side (outward direction). Even with this configuration, it is possible to achieve the same effect as that of the seventh embodiment.

  The vent hole 4 is formed, for example, between the peak portion 32a and the valley portion 31b, but is not limited to such a configuration. For example, the vent hole 4 may be formed between the valley portion 31 b and the valley portion 32 b, or may be formed between the mountain portion 31 a and the mountain portion 32 a, and is covered by the first gather portion 31. The main panel 12 may be formed on the surface, or the bent hole 4 may be formed in each folded portion.

  In the first embodiment to the tenth embodiment described above, the case where the gather portion 3 is formed on the occupant side main panel 12 has been described. However, the gather portion 3 may be formed on the main panel 11 on the door portion side. Alternatively, both main panels 11 and 12 may be formed. Moreover, based on the function and performance required of the gather part 3, the position which forms the gather part 3 can be arbitrarily set in the up-down direction and the front-back direction of the airbag 1. Moreover, you may make it replace arrangement | positioning of the peak part 3a of the gather part 3, and the trough part 3b.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention, such as being applicable to airbags other than side airbags.

DESCRIPTION OF SYMBOLS 1 Airbag 2 Inflator 3 Gather part 3a, 31a, 32a Mountain part 3b, 31b, 32b Valley part 4 Vent hole 5 Airbag case 11 Main panel (occupant side)
11a Normally open vent hole 12 Main panel (door side)
13 stitching portion 31 first gather portion 32 second gather portion 41 first vent hole 42 second vent hole

Claims (5)

In a side airbag that is normally folded and accommodated in a vehicle structure and inflated between the occupant and the door by supplying gas in an emergency,
A main panel that is stitched to form a bag,
A normally open vent hole that is formed in the main panel and always maintains an open state;
And gather portions to be sewn upon sewing of the main panel while being formed by folding a portion of said main panel,
A vent hole formed in a portion covered by the gather portion ,
During normal expansion and deployment that does not receive external force from the outer edge of the main panel, the gather hole holds the vent hole in a closed state, and when the external force is received from the outer edge of the main panel during expansion and deployment, the gather portion The vent hole is configured to shift to an open state by releasing from a state of being in close contact with the main panel,
A side airbag characterized by that. The side airbag according to claim 1, wherein the gather portion includes at least one mountain portion and at least one valley portion. The said gather part, The said peak part and the said trough part are continued alternately, or the said peak part or the said trough part is included, The part formed continuously is characterized by the above-mentioned. Side airbag . The side airbag according to claim 1, wherein the gather portion is formed in a rectangular shape, a triangular shape, or a trapezoidal shape. Side air time normally having a side air bag is inflated and deployed between the occupant and the door unit in an emergency housed folded into the structure of the vehicle, an inflator for supplying gas to the side airbag, the In the bag device,
The side airbag is a side airbag according to any one of claims 1 to 4, the side air bag device, characterized in that.