JP2013049392A - Curtain airbag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curtain airbag that can inflate and develop a third folding part in a further ideal form, by securing a space for inflating and developing the third folding part by inflation and development of a first folding part and a second folding part.SOLUTION: The second folding part (12) disposed outside a vehicle is first inflated and developed, the first folding part (11) and third folding part (13) are pressed to press up the lower end of a roof lining (4), to form an opening between a pillar garnish (2a) and the roof lining (4). At this time, the moving position of the third folding part (13) is positioned inside the vehicle displaced from the upper part of the pillar garnish (2a). By the inflation and development of the first folding part (11), the third folding part (13) is pushed out in the direction along side window glass. Thus, the third folding part (13) can be inflated and developed in the further ideal form.

Description

  The present invention relates to a curtain airbag that inflates and deploys along a window on the side of a vehicle.

  In recent years, many vehicles with curtain airbags that are inflated and deployed along the side of the vehicle in the passenger compartment have been used in order to protect the passenger's head in accidents such as side impacts and rollovers. Has been. When an accident such as a side collision or rollover is detected on the vehicle or when such an accident is predicted, the inflation gas injected from the inflator flows into the curtain airbag, and the curtain air Inflate and deploy the bag.

  The curtain airbag is housed in the roof side rail in a state where the curtain airbag is folded into a space between a ceiling material (rooflining) and the vehicle body panel. As the curtain airbag is inflated and deployed, the lower end of the roof lining is pushed upward on the inside of the vehicle, and the curtain airbag passes through the opened opening and moves downward along the window. It expands and expands into a shape. The occupant's head can be protected by the inflated and deployed curtain airbag.

  The curtain airbag generally includes a first fold portion and a second fold portion, and a third fold portion positioned between the first fold portion and the second fold portion is provided with a window portion in the vehicle interior. The structure which expand | deploys and expands in the shape of a curtain toward the downward direction is employ | adopted. As the curtain airbag having such a configuration, the applicant of the present application has already proposed the airbag (curtain airbag) described in Patent Document 1.

  In the curtain airbag described in Patent Document 1, the inflation gas introduced from one end of the curtain airbag is smoothly introduced to the other end side with respect to the curtain airbag arranged to be elongated along the roof side rail. It is configured to be able to. Then, the first folding portion and the second folding portion are inflated and deployed between the side portion of the vehicle body and the inside of the roof lining, respectively, and thereafter the third folding portion is inflated and deployed without interfering with the center pillar or the like. It is configured to be The curtain airbag can be stably inflated and deployed along the window portion with a predetermined behavior.

Japanese Patent Laid-Open No. 2003-175792

  The curtain airbag described in Patent Document 1 is configured such that the inflation gas introduced from the gas introduction part flows into both the first folding part and the second folding part from the initial stage of introduction. In describing the curtain airbag described in Patent Document 1, it is an explanatory diagram depicting the planar shape of the curtain airbag described in Patent Document 1 imitating the planar shape of the curtain airbag according to the present invention. 9 will be used for explanation.

As shown in FIG. 9, the curtain airbag 50 has a configuration in which two main base fabric panels are overlapped and the outer periphery of the overlapped main base fabric panels is sewn by a sewing portion 59. The curtain airbag 50 has a configuration in which a second folding part 52 is continuous with a third folding part 53 folded in a roll shape, and a first folding part 51 is continuous with the second folding part 52. The second folding part 52 and the first folding part 51 are sequentially folded from the upper center of the third folding part 53 to the left and right. The curtain airbag 50 is folded in a so-called roll-over fold.

  The inflation gas from the inflator (not shown) can be introduced into the gas introduction part 56 via the gas introduction pipe 57, and the inflation gas introduced into the gas introduction part 56 is supplied from the gas circulation part 55 to the first folding part 51. And the second folding part 52. With this configuration, a space for inflating and developing the third folding part 53 can be secured by the expansion and deployment of the first folding part 51 and the second folding part 52.

  However, the behavior direction when the third folding part 53 is inflated and deployed is directed by the inflating and deploying of the first folding part 51 and the second folding part 52 that have started the inflation and deployment at the same time. Therefore, the direction in which the first folding part 51 and the second folding part 52 inflate and deploy and press the third folding part 53 does not necessarily coincide with the ideal inflating and developing direction of the third folding part 53. I didn't go there easily. Therefore, in order to make the expansion and expansion direction of the third folding part 53 ideal, it is required to add further improvements.

  This invention adds the further improvement to the curtain airbag described in patent document 1, and is a space for inflating and deploying the third fold portion by inflating and deploying the first fold portion and the second fold portion. An object of the present invention is to provide a curtain airbag capable of inflating and deploying the third folded portion in a more ideal form.

The object of the present invention can be achieved by the inventions described in claims 1 to 5.
That is, the present invention is a curtain airbag that is folded and stored in a roof side portion of a vehicle and inflated and deployed along a vehicle side window portion by introduction of inflation gas,
A gas introduction part into which inflation gas from an inflator is introduced, a first folding part that is located on the inner side of the vehicle and inflated and deployed, a second folding part that is located on the outer side of the car and inflated and deployed, and the first folding part, A third fold portion located between the second fold portion and inflating and deploying in a curtain shape downward along the window portion in the vehicle interior;
The second folding part includes a gas flow part directly connected to the gas introduction part, and an expansion gas branched from the gas circulation part is first introduced into the first folding part. The most important feature is that after the second folding part starts inflating and expanding, the respective folding parts sequentially inflate and deploy in the order of inflating and developing the first folding part and inflating and developing the third folding part.

In the curtain airbag according to the present invention, a communication hole is formed at a boundary portion between the gas circulation portion and the first folding portion, and an inflation gas passing through the communication hole is introduced into the first folding portion. This is the main feature.
Furthermore, in the present invention, the main feature is that the third folding portion is a folding portion folded in a roll shape.

Furthermore, in the present invention, the main feature is that the third fold portion is a fold portion folded in a bellows shape.
The main feature of the present invention is that the gas introduction part is directly connected to the intermediate part in the longitudinal direction of the gas circulation part.

In the curtain airbag according to the invention of the present application, the second folded portion disposed on the vehicle outer side is first inflated and deployed, and a part of the inflation gas supplied to the second folded portion is disposed on the vehicle inner side. First
It is the structure supplied first with respect to a folding part. With this configuration, the first fold portion and the second fold portion can be inflated and deployed first before the first fold portion, without starting to inflate and deploy at the same time.

  Then, when the second fold portion starts inflating and deploying before the first fold portion, the first fold portion and the third fold portion can be pressed toward the vehicle inner side by the inflating and deploying of the second fold portion, An opening can be formed by pushing the lower end side of the roof lining that houses the curtain airbag upward in the vehicle interior. Moreover, the third fold can be moved to a position where interference with the upper edge of the center pillar garnish is prevented.

When the first fold portion is inflated and deployed following the expansion and deployment of the second fold portion, the opening can be further pushed open, and the third fold portion can be pressed by the expansion and deployment of the first fold portion. And the direction which presses a 3rd folding part can be made to become a direction along the window part of a vehicle side, when a 3rd folding part expand | swells and expands through the said opening.
Thereby, the third folding part can be inflated and deployed along the vehicle side window part in an ideal form.

  In the present invention, a part of the inflation gas supplied to the second fold is used as the inflation gas initially supplied to the first fold. As a configuration for supplying the expansion gas to the first folding portion, a communication hole may be formed at a boundary portion between the gas circulation portion and the first folding portion that are inherent in the second folding portion. The number of communicating holes and the diameter of the communicating holes can be adjusted by the configuration of the communicating holes, and the flow rate of the expansion gas supplied to the first folding portion through the communicating holes can be adjusted.

  Then, by adjusting the flow rate of the expansion gas supplied to the first folding part through the communication hole, the first folding part is inflated and deployed with a time difference from the start of the expansion and deployment of the second folding part. Each start timing can be adjusted, such as how to set. Further, by adjusting the storage shape and the expansion volume of the first fold and the second fold in the roof lining that has stored the curtain airbag, the first fold and the third fold can be obtained by inflating and deploying the first fold. The pressing direction for pressing the part and the pressing direction for pressing the third folding part can be adjusted by the expansion and deployment of the first folding part.

  As a structure of the 3rd folding part in this invention, it can comprise as a folding part folded in roll shape, and can also be comprised as a folding part folded in the shape of a bellows. By configuring the third folding portion in this manner, the third folding portion can be rapidly inflated and deployed along the vehicle side window.

  In the present invention, the gas introduction part that directly communicates with the gas circulation part may be formed on the end side of the curtain airbag, or may be configured to directly communicate with the intermediate part in the longitudinal direction of the gas circulation part. When the gas introduction part is in communication with the intermediate part of the gas circulation part, the gas introduction part is opened in the front-rear direction so that the inflation gas can be circulated from the intermediate part of the gas circulation part in the front-rear direction of the gas circulation part. It can be set as the structure provided with the inner tube which has an edge part opening. Instead of configuring the inner tube, a gas introduction port may be formed in an intermediate portion of the gas circulation portion by a base fabric panel configuring the curtain airbag.

It is a schematic front view which shows the state which accommodated the curtain airbag in the roof side part. (Example) It is the front view which made the curtain airbag the expansion | deployment state, and the longitudinal cross-sectional view which made the storage state. Example 1 It is a perspective view of the folded curtain airbag. Example 1 It is a longitudinal cross-sectional view of the curtain airbag which shows the accommodation state in a roof side part. Example 1 It is principal part sectional drawing which shows the expansion | deployment expansion state of a 1st fold part and a 2nd fold part. Example 1 It is the front view which made the curtain airbag the expansion | deployment state, and the longitudinal cross-sectional view which made the storage state. Example 1 It is the front view which made the curtain airbag the deployment state. (Example 2) It is a front view of the folded curtain airbag. (Example 3) It is the front view which made the curtain airbag the expansion | deployment state, and the longitudinal cross-sectional view which made the storage state. (Explanation)

  Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The curtain airbag according to the present invention is not limited to the configuration of the embodiment described below, and various modifications are possible.

  As shown in FIG. 1, the curtain airbag device 40 includes a folded curtain airbag 10, an inflator 6 that generates inflation gas, and a gas introduction pipe 7 that connects the inflator 6 to the curtain airbag 10. It is configured. The curtain airbag 10 can be attached to the roof side rail 3 via the attachment portion 14.

  That is, as shown in FIG. 4, the curtain airbag 10 is disposed between the roof lining 4 and the roof side rail 3 engaged with the upper edge of the pillar garnish 2 a that decorates the interior side of the center pillar 2. It is attached to the roof side rail 3 via a bracket 9 in the roof lining 4.

  Here, the center pillar 2 is located on the side of a portion between the front air chamber 18a and the rear air chamber 18b of the curtain airbag 10 to be described later, and is a so-called A pillar disposed at the front and rear of the vehicle B pillars that are not C pillars and that are covered by the deployed curtain airbag 10 are shown. Further, depending on the type of vehicle, there is also a vehicle having a configuration including four or more pillars on one side, for example. Even in such a vehicle, for example, the third pillar can be covered with a curtain airbag from the front of the vehicle, but for the sake of simplicity, the third and subsequent pillars from the front of the vehicle are the C pillars that are rear pillars. Will be treated as

  When the occurrence of an accident such as a side collision or rollover with respect to the vehicle 1 is detected or the occurrence of such an accident is predicted, the inflation gas injected from the inflator 6 of the curtain airbag device 40 is used as the curtain airbag. The curtain airbag 10 is inflated and deployed.

  As the curtain airbag 10 is inflated and deployed, as shown in FIG. 5 (a), the lower end portion of the roof lining 4 engaged with the upper end portion of the pillar garnish 2a is pushed upward above the vehicle interior side. Can do. Then, the curtain airbag 10 is deployed in a curtain shape downward through the pushed-open opening without interfering with the pillar garnish 2a. Thus, the inflated and deployed curtain airbag 10 covers the front seat side windshield 5a (see FIG. 1) and the rear seat side windshield 5b (see FIG. 1) to protect the occupant's head. can do.

As shown in FIG. 2 (a), which shows a front view of the curtain airbag 10 in a deployed state, the curtain airbag 10 is made of, for example, a basis weight of 200 g / y using 315 denier nylon 66 yarn.
The ^two main base fabric panels of m ² can be overlapped, and the outer periphery of the overlapped main base fabric panel can be joined by the sewing part 19. Alternatively, one main base fabric panel may be folded and the outer periphery of the folded main base fabric panel may be joined by the sewing portion 19.

  The form, material and structure of the curtain airbag 10 and the form and structure of the inflator 6 are not particularly different from the conventional ones. Therefore, the present invention is not limited to the embodiments described below.

  Then, as shown in FIG. 2B and FIG. 3 showing a longitudinal sectional view of the curtain airbag 10 folded into a fold, the curtain airbag 10 is a third folded folded into a roll shape. Continuing from the portion 13, the second folding portion 12 and the first folding portion 11 are sequentially folded from the center upper portion of the third folding portion 13 to the left and right. The third folding part 13 is located between the first folding part 11 and the second folding part 12. That is, the first fold part 11 and the second fold part 12 constitute a so-called rollover fold.

  2B is indicated by a dotted line A in FIG. 2A, and the turning point B of the second folding part 12 in FIG. In FIG. 2A, this is indicated by a dotted line B. Moreover, although the folding shape folded in roll shape is shown as the 3rd folding part 13, it can also comprise in the folding shape folded in zigzag like a bellows as a structure of the 3rd folding part 13. FIG.

As shown in FIG. 4, the curtain airbag 10 can be attached to the roof side rail 3 with the first folding portion 11 positioned on the vehicle inner side and the second folding portion 12 positioned on the vehicle outer side.
In the configuration example shown in FIGS. 2B and 3, when the folded shape of the third folding portion 13 is viewed from the front side of the vehicle 1, it is wound clockwise from the lower end when inflated and deployed in the clockwise direction. Is formed. The second folding portion 12 is configured to be continuous with the third folding portion 13 and is folded so as to wrap and cover the right side from the upper center of the third folding portion 13. The first folding part 11 is configured to be continuous with the second folding part 12 and is folded so as to wrap and cover the left side from the upper center of the third folding part 13.

  When the folded shape of the third folding portion 13 is viewed from the front side of the vehicle 1, the third folding portion 13 is formed in a shape that is wound counterclockwise from the lower end portion when inflated and deployed in a counterclockwise direction. Can be kept. In this case, the second folding part 12 configured continuously with the third folding part 13 is folded so as to wrap around and cover the left side from the upper center of the third folding part 13. The first folding part 11 configured continuously with the part 12 is folded so as to wrap and cover the right side from the upper center of the third folding part 13.

  When the folded shape of the third folding portion 13 is viewed from the front side of the vehicle 1, the curtain airbag 10 wound clockwise is wound on the passenger seat side in the vehicle 1 with the right handle. The curtain airbag 10 is a curtain airbag 10 wound in the counterclockwise direction and wound in a counterclockwise direction, and can be disposed as the curtain airbag 10 on the driver's seat side.

  That is, in FIG. 2B, the first folding part 11 is arranged on the IN side of the arrow, and the second folding part 12 is arranged on the OUT side of the arrow. Moreover, the arrow F direction of Fig.2 (a) shows the advancing direction of a vehicle, it folds, and the arrow U direction has shown the upward direction of the vehicle.

As shown in FIG. 2A, the expansion gas generated by the inflator is guided to the gas introduction part 16 through the gas introduction pipe 7. The inflation gas guided to the gas introduction unit 16 is supplied into the gas circulation unit 15 that directly communicates with the gas introduction unit 16. The gas circulation part 15 is configured in the second folding part 12,
When the inflation gas is supplied to the gas circulation part 15, the second folding part 12 starts to expand and deploy.

  The gas circulation part 15 communicates with the first folding part 11 through the communication hole 21, and a part of the expansion gas supplied from the inflator into the gas circulation part 15 passes through the communication hole 21 to the first folding part. It will be supplied into the section 11. The communication hole 21 is formed at a boundary portion between the gas flow portion 15 formed in the second fold portion 12 and the first fold portion 11, and the boundary portion is sewn at a predetermined interval at the joint portion 20. Is formed.

  When the second folding portion 12 starts inflating and expanding, the first folding portion 11 also starts to expand and deploy with a delay. However, the speed of expansion and deployment is faster in the second folding part 12 than in the first folding part 11. Therefore, as shown in FIG. 4 and FIG. 5A, the first folding portion 11 and the third folding portion 13 are pressed in the direction of the arrow away from the roof side rail 3 by the expansion and deployment of the second folding portion 12. The lower end of the roof lining 4 is disengaged from the pillar garnish 2a. Then, the lower end portion of the roof lining 4 is pushed upward to form an opening with the pillar garnish 2a.

  At this time, the third folding portion 13 is in a position moved to the indoor side outside the pillar garnish 2a. Subsequently, when the first folding part 11 starts inflating and deploying following the inflating and unfolding of the second folding part 12, the third folding part 13 located on the indoor side outside the pillar garnish 2a is moved to the side window glass 5a, It will press downward along 5b (see FIG. 1). And the 3rd folding part 13 can expand-deploy in the downward direction along side window glass 5a, 5b (refer FIG. 1). As a result, the third folding portion 13 can be inflated and deployed in a more ideal deployment direction.

  FIG. 5A shows a state in which there is a joint 20 that is sewn at the boundary between the first folding portion 11 and the gas flow portion 15 in order to form the communication hole 21. Therefore, the space between the first fold portion 11 and the second fold portion 12 is narrow, but by adjusting the strength of the sewing thread sewn to the joint portion 20, the inside of the first fold portion 11 can be adjusted. When the internal pressure rises above a predetermined internal pressure, the sewing thread of the joint portion 20 shown in FIG. 5A can be broken to increase the opening area of the communication hole.

  Further, instead of the configuration in which the opening area of the communication hole 21 is increased by breaking the sewing thread, a configuration using a sealing agent 22 as the joining portion 20 can be used as shown in FIG. When the internal pressure in the first folding part 11 rises to a predetermined internal pressure or higher, the seal agent 22 is peeled off by the seal agent 22 and a communication hole 21 is formed at the location where the seal agent 22 is peeled off. Then, a part of the inflation gas flowing in the gas circulation part 15 flows into the first folding part 11 through the communication hole 21.

  If the sealing agent 22 is used while leaving a desired interval in the length direction of the curtain airbag 10, the communication hole 21 can be formed from the beginning. Further, by varying the amount of the sealant 22 used in the length direction of the curtain airbag 10 for each desired interval, the strength of the bonding between the gas flow portion 15 and the first folding portion 11 is increased or decreased. Can be given. Then, the communication hole 21 can be configured by first peeling off the adhesive where the bonding strength is weak.

  With this configuration, as shown in FIG. 5 (b), when the first folding portion 11 and the second folding portion 12 are inflated and deployed, the first folded portion 11 and the second folded portion 12 that are inflated and deployed Can be formed as a bag-like inflatable part above the third folding part 13. Even in the case shown in FIG. 5 (b), when the first folding part 11 starts to expand and deploy, the first folding part 11 and the third folding part 13 are connected to the roof in the same manner as shown in FIG. 5 (a). It can be pressed in the direction of the arrow away from the side rail 3.

  At this time, the third folding portion 13 is located at a position that is disengaged indoors from above the pillar garnish 2a. Next, when the first folding part 11 is expanded and deployed, the third folding part 13 is pressed downward along the side window glasses 5a and 5b (see FIG. 1). When the third folding portion 13 is inflated and deployed, it can be inflated and deployed in the downward direction along the side window glasses 5a and 5b (see FIG. 1). Thereby, the third folding part 13 can be inflated and deployed in a more ideal form.

  The second embodiment has a configuration in which the third folding portion 13 is disposed between the first folding portion 11 and the second folding portion 12 as in the first embodiment. It is comprised in the middle part. The other configuration has the same configuration as that of the first embodiment, and the components similar to the configuration in the first embodiment are omitted by using the reference numerals used in the first embodiment. The second embodiment will be described with reference to FIG.

  A gas circulation part 15 is formed in the second folding part 12 (see FIG. 2B) of the curtain airbag 26, and the gas introduction part 28 is formed in an intermediate part of the gas circulation part 15. Then, the inflation gas can be supplied to the gas circulation part 15 via the gas introduction pipe 7 connected to an inflator (not shown). An inner tube 27 is connected to the gas introduction pipe 7, and the expanded gas flowing into the inner tube 27 can be distributed from the middle part of the gas circulation part 15 in the longitudinal direction of the vehicle.

  Between the gas circulation part 15 and the first folding part 11 (see FIG. 2B), the joint part 20 is sewn, and a communication hole 21 is formed between the adjacent joint parts 20. . As described with reference to FIG. 5A, the joining portion 20 may be configured to be sewn between the gas flow portion 15 and the first folding portion 11 (see FIG. 2B). It is also possible to use a sewing thread that is ruptured by a tensile force between the gas flow part 15 and the first folding part 11 (see FIG. 2B).

In addition, as described with reference to FIG. 6, the joining portion 20 may be configured using the sealing agent 22. It can also be configured such that when a predetermined tensile force acts on the sealing agent 22, the joining state of the sealing agent 22 is peeled off.
With this configuration, it is possible to give a degree of freedom to the position where the inflator is disposed.

  Although the configuration using the inner tube 27 has been described in FIG. 7, instead of configuring the inner tube 27 with a base fabric panel separate from the main base fabric panel of the curtain airbag 26, It is also possible to form a gas inlet in the middle part of the gas circulation part 15 with the main base fabric panel.

  In the third embodiment, similarly to the second embodiment, the gas introduction part 38 is configured in the middle part of the gas circulation part 15. In the first and second embodiments, the first fold portion 11 and the second fold portion 12 are formed by so-called rollover folding, but in the third embodiment, the curtain airbag 30 is formed by the so-called parasol folding. And a second folding part 32 are formed. In addition, an inner tube 34 is disposed in the gas introduction part 38 in order to supply inflation gas to the first folding part 31 and the second folding part 32 that are parasol-folded.

The opening area at both ends for inflating gas outflow of the inner tube 34 is configured such that the opening area communicating with the first folding part 31 is smaller than the opening area communicating with the second folding part 32. ing. That is, the same function as that of the communication hole 21 in the first and second embodiments is achieved by making the opening areas at both ends on the outflow side of the inner tube 34 different. The other configurations have the same configurations as those in the first and second embodiments, and the same configurations as those in the first and second embodiments are configured by using the member codes used in the first and second embodiments. Description is omitted. The third embodiment will be described with reference to FIG.

  As shown in FIG. 8, the third folding part 33 is folded by a first folding part 31 and a second folding part 32 that are parasol-folded so as to be wrapped and covered from above. Expansion gas from an inflator (not shown) is introduced into the inner tube 34 via the gas introduction pipe 7. The inflation gas introduced into the inner tube 34 is distributed to the first fold portion 31 and the second fold portion 32 by the inner tube 34.

  The side edge of the lower side of the inner tube 34 may be sewn to the boundary between the first fold part 31 and the second fold part 32, or when the second fold part 32 expands beyond a predetermined capacity. The second fold 32 and the first fold 31 may be configured to communicate with each other on the lower side of the inner tube 34.

  When the lower side edge of the inner tube 34 is sewn to the boundary between the first fold portion 31 and the second fold portion 32, the expansion of the second fold portion 32 and the first fold portion 31 causes the An inflatable portion having two bag portions having a shape as shown in FIG. 5A can be formed above the third folding portion 33. Further, when the second folding part 32 expands to a predetermined capacity or more, the second folding part 32 and the first folding part 31 communicate with each other on the lower side of the inner tube 34. An inflatable portion composed of one bag portion having a shape as shown in FIG. 5B can be formed.

  The opening areas at both ends of the inner tube 34 are set so that the flow rate of the inflation gas flowing into the second folding portion 32 is higher than the flow rate of the inflation gas flowing into the first folding portion 31. Yes. Since it is configured in this way, the second folding portion 32 disposed on the vehicle outer side first starts to expand and deploy, and then the first folding portion 31 disposed on the vehicle inner side starts to expand and deploy.

When the second folding part 32 expands and deploys, the first folding part 31 and the third folding part 33 can be pressed toward the inside of the vehicle. The pressing and pressing directions of the first folding part 31 and the third folding part 33 by the second folding part 32 are performed in the same manner as described in the first and second embodiments.
When the first folding part 31 is inflated and deployed following the expansion and deployment of the second folding part 32, the third folding part 33 can be pressed in an ideal deployment direction.

  In the third embodiment, the configuration in which the gas introduction portion 38 is formed in the middle portion of the gas circulation portion 15 has been described. However, the gas introduction portion 38 is arranged at the end in the front-rear direction of the curtain airbag 30 as in the first embodiment. It can also be configured on the part side. Even when the gas introduction part 38 is configured on the end side in the front-rear direction of the curtain airbag 30, most of the inflation gas introduced into the curtain airbag 30 using the inner tube 34 communicating with the gas introduction pipe 7 Is first supplied to the second folding part 32, and a part of the inflation gas needs to be supplied to the first folding part 31.

  Then, the first folding part 31 and the third folding part 33 are moved to the inside of the vehicle by the expansion and deployment of the second folding part 32, and then the third folding part 33 is moved to the side window by the expansion and deployment of the first folding part 31. It can be configured to be pressed downward along the glasses 5a and 5b (see FIG. 1).

  Thereby, the third folding part 33 can be inflated and deployed in a more ideal form.

  The technical idea of the present invention can be applied to other configurations of airbags.

1 ... vehicle,
2a ... Pillar garnish,
4 ... Lou Flying,
6 ... Inflator,
7: Gas introduction pipe,
10 ... curtain airbag,
11 ... 1st fold part,
12 ... 2nd folding part,
13: Third fold,
15 ... Gas distribution part,
16 ... Gas introduction part,
20 ... Junction part,
21 ... Communication hole
22 ... sealant,
26 ... curtain airbag,
27 ... Inner tube,
28: Gas introduction part,
30 ... curtain airbag,
31 ... 1st fold part,
32 ... the second folding part,
33 ... third fold,
34 ... Inner tube,
40 ... curtain airbag device,
50 ... curtain airbag,
51 ... 1st fold part,
52 ... the second folding part,
53 ... third fold,
55 ... Gas distribution part,
56 ... gas introduction part,
F ... forward,
U ... above,
IN: Inside the passenger compartment
OUT: Outside the car.

Claims (5)

A curtain airbag that is folded and stored in the roof side portion of the vehicle, and inflates and deploys along the vehicle side window portion by introducing inflation gas,
A gas introduction part into which inflation gas from an inflator is introduced, a first folding part that is located on the inner side of the vehicle and inflated and deployed, a second folding part that is located on the outer side of the car and inflated and deployed, and the first folding part, A third fold portion located between the second fold portion and inflating and deploying in a curtain shape downward along the window portion in the vehicle interior;
The second folding part includes a gas flow part directly connected to the gas introduction part,
The first folding part is introduced with an expansion gas that is initially branched from the gas circulation part,
After the second fold portion starts to expand and deploy by introduction of an inflation gas, each fold portion sequentially expands and deploys in the order of expansion and deployment of the first fold portion and expansion and deployment of the third fold portion. Curtain airbag.   2. The communication hole according to claim 1, wherein a communication hole is formed in a boundary portion between the gas circulation part and the first folding part, and an expansion gas passing through the communication hole is introduced into the first folding part. Curtain airbag.   The curtain airbag according to claim 1 or 2, wherein the third folding part is a folded part folded in a roll shape.   The curtain airbag according to claim 1, wherein the third folding portion is a folded portion that is folded in a bellows shape.   The curtain airbag according to any one of claims 1 to 4, wherein the gas introduction part is directly passed through an intermediate part in a longitudinal direction of the gas circulation part.

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