JP5961093B2 - Curtain airbag device for vehicle - Google Patents

Description

  The present invention reliably deploys and inflates the front portion of the curtain airbag ahead of the rear portion on the assumption that the inflator is provided at the rear of the vehicle and the inflator gas is introduced from the rear portion of the curtain airbag. In addition, the present invention relates to a curtain airbag device for a vehicle that can ensure occupant protection performance even at a rear portion of a curtain airbag in which deployment and inflation timing is delayed.

  In the curtain airbag device that is deployed and inflated in a form that covers the side window portion of the vehicle, as disclosed in Patent Literature 1 and Patent Literature 2, the bulge of the bag portion is variously adjusted. It has been known.

  The “airbag device” of Patent Document 1 is an airbag device provided on the side of a vehicle body, and it is not necessary to increase the thickness of the airbag as a whole, and it is an object to provide a small airbag device. In an airbag device having an airbag that is provided on a roof side rail and inflates and deploys inside a window portion on the side of a vehicle body by detecting impact force in the vehicle width direction, A sheet (penetration-resistant member) that enhances the penetration resistance is provided.

  The “curtain airbag and the manufacturing method thereof” of Patent Document 2 have an object to provide a curtain airbag capable of effectively protecting an occupant even in a collision in an oblique direction. Gas is supplied from the inflator to the auxiliary chamber and each chamber. The auxiliary chamber is fixed so as to overlap with the chamber in a direction intersecting with the chamber continuous direction. That is, the auxiliary chamber is folded back, and the chamber and the auxiliary chamber are sewn and fixed with a thread at the partition portion provided around the chamber and the auxiliary chamber.

JP-A-8-26062 JP 2008-1197 A

  A curtain airbag for a vehicle is formed with a very long length that reaches the periphery of the C pillar from the periphery of the A pillar along the roof side rail along the longitudinal direction of the vehicle, and is ejected from the inflator. The inflator gas is expanded and inflated so as to cover the side window portion downward from the roof side rail position.

  If an inflator is provided around the C-pillar and the inflator gas is supplied from the rear part of the curtain airbag, the rear part of the curtain airbag naturally expands and expands automatically, and the inflation and deployment timing of the front part of the curtain airbag Expansion and expansion speed will be slow. The front part of the curtain airbag is a part that protects the area around the front seat on which the driver or the like is occupying, and even if an inflator is provided at the rear of the vehicle, it is not preferable that an operation delay occurs, and countermeasures are desired. It is rare.

  The present invention was devised in view of the above-described conventional problems, and is based on the premise that an inflator is provided at the rear of the vehicle and inflator gas is introduced from a rear portion of the curtain airbag. A vehicle curtain that can reliably inflate and inflate the part ahead of the rear part, and can ensure occupant protection performance even at the rear part of the curtain airbag where the inflation and inflation timing is delayed An object is to provide an airbag device.

A curtain airbag device for a vehicle according to the present invention is formed along a front-rear direction of a vehicle, and includes a front chamber region located in front of the vehicle, a gas introduction passage located in an upper rear portion of the vehicle and communicating with the front chamber region, and a vehicle rear A curtain airbag having a rear chamber region located under the gas introduction passage and communicating with the front chamber region; and provided in a rear portion of the curtain airbag, and at least the gas introduction passage in the curtain airbag And the rear chamber region , and a partition portion formed in a form in which a single front end of the vehicle front side is directed to the front chamber region side of the vehicle front, and the partition portion formed above provided in the gas introduction passage, and an inflator for introducing the inflator gas from the vehicle rear side to the gas introduction passage, the Katen'e Are attached supported by the bag, the additional bag is disposed outside of the curtain air bag in accordance with the least covering position the partition portion, provided is positioned between said front end and said inflator of the partition section, And a communication passage that communicates the inside of the additional bag and the inside of the gas introduction passage.

It is preferable that the additional bag is provided on the vehicle interior side of the curtain airbag. It is preferable that the front chamber region is formed in front of the front end of the partition portion. It is desirable that the front end of the partition portion is formed in a form that hangs downward. The front chamber region and the additional bag are deployed and inflated at approximately the same time. The rear chamber region is expanded and inflated at a later timing than the additional bag and the front chamber region.

In the curtain airbag device for a vehicle according to the present invention, on the assumption that the inflator is provided at the rear of the vehicle and the inflator gas is introduced from the rear portion of the curtain airbag, the front portion of the curtain airbag is rearward. It can be surely deployed and inflated prior to the portion, and occupant protection performance can be ensured even at the rear portion of the curtain airbag where the deployment and inflation timing is delayed. Specifically, when the inflator is activated, the inflator gas is jetted into the gas introduction passage. The gas ejected into the gas introduction passage is guided to the gas introduction passage, flows into the front chamber region, and simultaneously flows into the additional bag through the communication passage. In the curtain airbag, the front chamber region precedes the rear chamber region by the inflator gas flowing from the gas introduction passage formed by the partitioning portion, and begins to expand at a fast deployment and expansion speed at an early timing. The additional bag 4 is deployed and expanded at substantially the same time as the expansion and expansion of the front chamber region. When the inflator gas fills the additional bag and the front chamber region, the inflator gas then flows into the rear chamber region, thereby completing the expansion and expansion of the rear chamber region at slightly later timing than the additional bag and the front chamber region. In this way, in the initial deployment / expansion stage, the inflator gas can be sent exclusively from the gas introduction passage formed by the partition portion to the front chamber region, and the deployment / expansion timing and speed of the front chamber region are accelerated, and then the rear chamber region is It can be expanded and expanded at an appropriate timing. In the aspect in which the front chamber region is first deployed and inflated, for the occupant seated around the rear portion of the curtain airbag, the additional bag at the partition portion position is deployed and inflated at almost the same timing as the front chamber region. The passenger can be appropriately protected by the bag. Moreover, the expansion | deployment effect | action of the rear part of the curtain airbag developed later can be promoted by the expansion | swelling which the additional bag precedes.

1 is a front view showing a preferred embodiment of a vehicle curtain airbag device according to the present invention. In FIG. 1, it is an AA arrow directional cross-sectional view. It is a perspective view which shows the initial stage expansion | deployment state of the curtain airbag of the curtain airbag apparatus shown in FIG. 1, and an additional bag. It is a perspective view which shows the deployment inflation completion state of the curtain airbag and additional bag of the curtain airbag apparatus shown in FIG. In FIG. 4, it is a BB arrow directional cross-sectional view.

  Hereinafter, a preferred embodiment of a curtain airbag device for a vehicle according to the present invention will be described in detail with reference to the accompanying drawings. 1 is a front view of a curtain airbag device for a vehicle according to the present embodiment, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is an initial deployment and inflation of the curtain airbag and the additional bag. FIG. 4 is a perspective view showing a state where deployment and inflation of the curtain airbag and the additional bag are completed, and FIG. 5 is a cross-sectional view taken along line BB in FIG.

  A curtain airbag device 1 for a vehicle according to this embodiment mainly includes a curtain airbag 2, an inflator 3 that supplies inflator gas into the curtain airbag 2, and an additional bag that is attached to and supported by the curtain airbag 2. 4.

  As is conventionally known, the curtain airbag 2 is formed with a length that reaches the C pillar 7 from the periphery of the A pillar 5 of the vehicle through the B pillar 6 along the longitudinal direction of the vehicle, and the roof side rail. It is formed with a height dimension that covers the entire side window portion of the vehicle from near the position downward.

  The curtain airbag 2 is stored in the vicinity of the roof side rail in a state of being wound or folded, and is inflated while being inflated by introducing the inflator gas therein, and is seated on the front seat and the rear seat. Protect. In the illustrated example, the outer contour of the curtain airbag 2 is formed in a substantially rectangular shape, but it is needless to say that other outer contours may be used.

  The curtain airbag 2 passes one or more base fabrics along the outline of the curtain airbag 2 from the upper edge 2a through the front edge 2b, passes through the lower edge 2c, and then reaches the rear edge 2d. It joins in the junction part S1 which reaches | attains, and it forms in a hollow bag shape. Thereby, inside the curtain airbag 1, it seals with junction part S1, and hollow chamber area | region C1, C2 is formed.

  A hollow tubular inflator mounting portion 8 is integrally formed at the rear portion of the curtain airbag 2 located around the C pillar 7 so as to extend rearward from the rear edge 2d. The inflator mounting portion 8 is a part of a gas introduction passage D described later. The inflator mounting portion 8 is formed by an extended joint portion S2 provided continuously to the joint portion S1 along the outer contour of the curtain airbag 2, whereby the inflator mounting portion 8 is communicated with the hollow chamber regions C1 and C2. The

  The inflator 3 for ejecting inflator gas is mounted on the inflator mounting portion 8. The inflator 3 is inserted into the inflator mounting portion 8 from the vehicle rear side so as to introduce the inflator gas into the gas introduction passage D from the vehicle rear side. The inflator 3 is held by the grip band 9 wound around the inflator mounting portion 8 around the inflator mounting portion 8. Further, the grip band 9 hermetically seals the inflator mounting portion 8 to which the inflator 3 is mounted to prevent leakage of the inflator gas.

  In the rear part of the curtain airbag 2, a seam (sewing part; partitioning part) 10 extending inward from the rear edge 2d to the curtain airbag 2 is provided continuously to the extension joint part S2 of the inflator mounting part 8.

  The seam 10 is extended inward of the curtain airbag 2 so that the interior of the curtain airbag 2 is positioned in front of the curtain airbag 2 (vehicle) (approximately between the A pillar 5 and the B pillar 6). The front chamber region C1 is located in the upper rear portion of the curtain airbag 2 (vehicle) and communicates with the front chamber region C1 and the rear of the curtain airbag 2 (vehicle) (approximately the B pillar 6 and the C pillar 7). Between the front chamber region C1 and the rear chamber region C2. The seam 10 may at least partition the gas introduction passage D and the rear chamber region C2.

  Specifically, the interior of the curtain airbag 2 is divided into upper and lower portions by the seam 10 so that the gas introduction passage D is formed in the upper portion and the rear chamber region C2 is formed in the lower portion, and at the same time the front end 10a of the seam 10 is forward. In addition, the front chamber region C1 is formed. In the illustrated example, the seam 10 is formed substantially horizontally toward the front of the curtain airbag 2, but may be formed obliquely upward or obliquely downward toward the front.

  The gas introduction passage D only needs to communicate with at least the front chamber region C1. The rear chamber region C2 only needs to communicate with at least the front chamber region C1. In the present embodiment, the seam 10 has a front end so that the inflator gas from the gas introduction passage D flows before the front chamber region C1 and then flows smoothly toward the rear chamber region C2. At the same time as 10a heads toward the front chamber region C1, it is formed so as to hang down slightly.

  The chambers 11 to 14 formed in the front chamber region C1 and the rear chamber region C2 may be single or plural, and various forms may be set.

  In the illustrated example, the front chamber region C1 is turned forward from the gas introduction passage D to the first front chamber 11 that occupies almost the entire front portion of the curtain airbag 2, and folded back from the front end of the first front chamber to the upper rear. A second front chamber 12 and a third front chamber 13 that turns upward from the rear end of the first front chamber 11 are provided. On the other hand, the rear chamber region C <b> 2 includes a single rear chamber 14.

  Non-expanded to partition the inflator gas between the front chamber region C1 and the rear chamber region C2 in order to control that the inflator gas flows into the front chamber region C1 and then into the rear chamber region C2. It is preferable to set the portion 15.

  The additional bag 4 is provided so as to overlap the outer surface 2e of the curtain airbag 2 (see FIGS. 2 and 5). The additional bag 4 is formed into an independent hollow bag shape, for example, by folding one base fabric or overlapping two base fabrics and joining the peripheral edges thereof by the joining means S3 (see FIG. 2). . Therefore, when the inflator gas is introduced, it is expanded by itself. The additional bag 4 is disposed outside the curtain airbag 2 in accordance with at least a position covering the seam 10.

  In the present embodiment, the upper edge 4a of the additional bag 4 and the upper edge 2a of the curtain airbag 2 are joined by a joining method such as stitching S4, whereby the additional bag 4 is attached to and supported by the curtain airbag 2. In the illustrated example, the additional bag 4 faces the interior side of the curtain airbag 2 and overlaps the gas inlet passage D and the upper portion of the rear chamber region C2 at a side position of the curtain airbag 2. Formed in height and shape. What is necessary is just to set the front-back direction length of the additional bag 4 suitably.

  A hole 16 is formed in the additional bag 4 at a position facing the gas introduction passage D. An opening 17 is also formed in the gas introduction passage D of the curtain airbag 2 at a position facing the additional bag 4. The peripheral edge of the opening 17 and the peripheral edge of the hole 16 are joined by a joining method such as stitching S5, whereby a communication passage 18 that connects the inside of the additional bag 4 and the inside of the gas introduction passage D is formed. Thereby, a part of the inflator gas flowing through the gas introduction passage D is guided into the additional bag 4.

  The suturing S5 and the like for forming the communication path 18 may be performed before the curtain airbag 2 or the additional bag 4 is sealed and formed into a bag shape. In the figure, 19 is a strap for connecting the front edge 2b of the curtain airbag 2 and the A-pillar 5 of the vehicle to control the position of the front edge 2b when the curtain airbag 2 is deployed and inflated. is there.

  Next, the operation of the vehicle curtain airbag device 1 according to this embodiment will be described. When the inflator 3 operates, the inflator gas is jetted into the gas introduction passage D. The gas ejected into the gas introduction passage D is guided to the gas introduction passage D and flows into the front chamber region C1 (see arrow G1) as shown in FIG. (See arrow G2).

  In the curtain airbag 2, the front chamber region C1 precedes the rear chamber region C2 by the inflator gas flowing from the gas introduction passage D formed by the seam 10, and starts to be deployed at a fast deployment speed at an early timing. To do. At approximately the same time as the expansion and expansion of the front chamber region C1, the additional bag 4 is also expanded and expanded.

  When the additional bag 4 and the front chamber region C1 are filled with the inflator gas, then, as shown in FIG. 4, the inflator gas pushed back from the front chamber region C1 and the inflator gas continuously flowing out from the gas introduction passage D are Flowing into the chamber region C2 (see arrow G3), the deployment and expansion of the rear chamber region C2 is completed at a timing slightly later than the additional bag 4 and the front chamber region C1.

In the vehicle curtain airbag device 1 according to the present embodiment described above, the front chamber is provided in the rear portion of the curtain airbag 2 and is positioned in front of the curtain airbag 2 in the curtain airbag 2. The region C1, located at the upper rear part of the curtain airbag 2, is located behind the curtain airbag 2 and below the gas introduction passage D and communicates with the front chamber region C1. A seam 10 that divides and divides the rear chamber region C2, and an additional bag 4 that is attached to and supported by the curtain airbag 2 and that is disposed outside the curtain airbag 2 so as to cover at least the seam 10. 4 since the inner gas introducing passage D inwardly Metropolitan and a communication passage 18 which communicates, in the initial development stage of inflation, Sea 10, the inflator gas can be fed exclusively into the front chamber region C1 from the gas introduction passage D formed by 10, and the expansion and expansion timing and speed of the front chamber region C1 are accelerated, and then the rear chamber region C2 is expanded and expanded at an appropriate timing. be able to.

  If the entire curtain airbag 2 is not deployed and inflated in a balanced manner, but only the rear portion is deployed and inflated first, the curtain airbag 2 is caught on the garnishes of the pillars 5 to 7 including the C pillar 7, and the occupant as designed The protection performance may not be ensured. However, in this embodiment, since the front portion is first deployed and inflated, the entire curtain airbag 2 in the stored state can be smoothly deployed. In other words, it is possible to prevent the rear chamber region C2 from expanding and expanding before the front chamber region C1.

  Regarding the aspect in which the front chamber region C1 is first deployed and inflated, for an occupant seated around the rear portion of the curtain airbag 2, the additional bag 4 at the seam 10 position is deployed and inflated at substantially the same timing as the front chamber region C1. Therefore, the passenger can be properly protected by the additional bag 4. Moreover, the expansion | swelling effect | action of the back part of the curtain airbag 2 developed later can be promoted by the expansion | swelling which the additional bag 4 precedes.

  A gas introduction passage D can be formed inside the curtain airbag 2 by the seam 10, an inner tube that is separately required when guiding the inflator gas can be omitted, the number of parts can be reduced, and the number of assembly steps can be reduced. Can be reduced.

  In addition, the inner tube is usually provided for preventing the curtain airbag 2 from bursting due to the high-temperature and high-pressure inflator gas. In this embodiment, the additional bag 4 communicating with the gas introduction passage D via the communication passage 18 is provided. Since the pressure can be buffered by the additional bag 4, the occurrence of a burst in the curtain airbag 2 can be appropriately prevented.

  Further, since the additional bag 4 is provided on the interior side of the curtain airbag 2 in the vehicle cabin, an occupant seated around the seam 10 can be received by the additional bag 4 in the initial deployment and inflation stage, and excellent occupant protection performance. Can be guaranteed.

  The joining means and the non-expanded portion in the above embodiment may be any technique such as stitching, adhesion, fusion, and knitting.

  The vehicle curtain airbag device described above is a preferred example of the present invention, and other embodiments can be implemented or performed by various methods. In particular, the present invention is not limited to the detailed shape, size, configuration, and the like of the components shown in the accompanying drawings unless otherwise stated in the present specification. In addition, expressions and terms used in the present specification are for the purpose of explanation, and are not limited thereto unless otherwise specified.

DESCRIPTION OF SYMBOLS 1 Curtain airbag apparatus for vehicles 2 Curtain airbag 3 Inflator 4 Additional bag 10 Seam 18 Communication path C1 Front chamber area C2 Rear chamber area D Gas introduction path

Claims (6)

A front chamber region that is formed along the front-rear direction of the vehicle and is located in front of the vehicle, a gas introduction passage that is located in the upper rear portion of the vehicle and communicates with the front chamber region, and is located behind the vehicle and below the gas introduction passage. A curtain airbag comprising a rear chamber region in communication with the front chamber region;
The curtain airbag is provided at a rear portion of the curtain airbag , partitions the interior of the curtain airbag into at least the gas introduction passage and the rear chamber region , and a single front end of the vehicle front side is the front of the vehicle front. A partition formed in a form toward the chamber region side ;
An inflator that is provided in the gas introduction passage formed by the partition and introduces inflator gas into the gas introduction passage from the vehicle rear side;
An additional bag that is attached and supported by the curtain airbag and is arranged outside the curtain airbag in a position that covers at least the partition portion;
A curtain air for a vehicle, comprising: a communication passage that is provided between the front end of the partition portion and the inflator and communicates the inside of the additional bag and the inside of the gas introduction passage. Bag device.   The vehicular curtain airbag device according to claim 1, wherein the additional bag is provided on a vehicle interior side of the curtain airbag.   The curtain airbag device for a vehicle according to claim 1, wherein the front chamber region is formed in front of the front end of the partition portion.   The curtain airbag device for a vehicle according to any one of claims 1 to 3, wherein the front end of the partition portion is formed to hang downward.   The curtain airbag device for a vehicle according to any one of claims 1 to 4, wherein the front chamber region and the additional bag are deployed and inflated at substantially the same time.   The vehicular curtain airbag device according to any one of claims 1 to 5, wherein the rear chamber region is deployed and inflated at a later timing than the additional bag and the front chamber region.

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