JP2010201998A - Airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To normally deploy an airbag while preventing a rear side end of the airbag from contacting with an occupant, and to surely cover a vehicle inside wall of a deploying range. <P>SOLUTION: A first air chamber 33A and a second air chamber 33B adjacent to a front side are sectioned at the vehicle rear side end of the airbag 10. Lower ends of both air chambers 33A and 33B communicate with each other by a communicating part 33C. After the airbag 10 is successively folded back along first and second folds 40 and 41 crossing through an upper side of the communicating part 33C, the airbag is folded from a lower edge to an upper edge to be mounted to the vehicle. During inflation and deployment, the airbag 10 is deployed toward a lower side of the vehicle, the second air chamber 33B is inflated by flowing gas and a fold-back of the second fold 41 is eliminated. Continuously, the fold-back of the first fold 40 is eliminated, gas flows into the first air chamber 33A, the first air chamber 33A is inflated, and the airbag 10 is inflated and deployed up to the rear side end. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an airbag apparatus mounted on a vehicle such as an automobile, and more particularly to an airbag apparatus in which a folded airbag is attached to an upper portion of an inner wall of a vehicle along a vehicle front-rear direction.

  In order to protect passengers in the front seat and rear seat in the event of a vehicle collision or emergency, a side airbag device that deploys an airbag in a curtain shape with the passenger along the side wall including the window in the vehicle. (Curtain airbag devices) are widespread. In the airbag device, in order to reliably receive and protect the passenger's head around the head, it is required to inflate and deploy the entire airbag between the vehicle inner wall and the passenger quickly and smoothly. In particular, the portion of the airbag on the rear side of the vehicle should be covered with the pillar garnish from the vehicle interior to prevent the airbag from being caught by the pillar garnish protruding into the vehicle interior at the rear of the vehicle. Need to be deployed.

  Therefore, conventionally, an airbag is provided with an end-side inflating portion at the rear end portion and an adjacent inflating portion that is adjacent to the front side and allows gas to flow into the end-side inflating portion from the inlet at the lower end. An airbag device is known in which the airbag is folded back from the lower edge side to the upper edge side after being folded forward at the fold line in the adjacent inflating portion (see Patent Document 1).

  In this conventional airbag device, after the airbag is deployed downward due to the generation of gas, the folds in the adjacent inflatable portion are eliminated, the end side inflatable portion is deployed toward the rear side of the vehicle, and the end side inflatable portion is It expands from below and covers the pillar garnish from the passenger compartment. However, in this airbag device, when the fold in the adjacent inflatable portion is set relatively close to the rear end of the airbag, and the folded back length of the airbag is short, the deployment speed of the end side inflatable portion including elimination of the fold is high. Become. As a result, the end side inflating part is deployed to the opposite side by the force accompanying deployment, and reverses from the vehicle interior side to the vehicle inner wall side, thereby preventing normal deployment of the airbag, and the rear side end of the airbag. There is a possibility that the pillar garnish in the development range cannot be covered by the portion. On the other hand, when the folding length of the airbag is set to be long, the deployed rear side end portion may invade the occupant side and come into contact with the occupant.

  Further, in this conventional airbag device, the airbag is in the middle of deployment below the vehicle, and part of the folds in the adjacent inflated portion is eliminated before the adjacent inflated portion is fully deployed, so that It is also conceivable that gas flows into the end-side expansion part. In this case, since the end side inflating part starts to be deployed during the deployment of the airbag, the end side inflating part is deployed before the end of the downward deployment of the airbag, and the side wall of the pillar garnish protruding into the vehicle interior There is a risk that the range will not be covered from the vehicle interior side.

JP 2004-67045 A

  The present invention has been made in view of such a conventional problem, and its purpose is to normally prevent the rear end portion of the airbag inflating and deploying from above the vehicle from coming into contact with the occupant. It is to deploy and protect the occupant by reliably and smoothly covering the inner wall of the vehicle in the deployment range.

The present invention includes an airbag that is attached along the vehicle front-rear direction in a state of being folded at the upper portion of the vehicle inner wall, and an inflator that supplies gas to the airbag and inflates and deploys the vehicle downward. An airbag device, wherein an airbag is adjacent to a first air chamber formed at a rear side end portion in a vehicle front-rear direction and a front side of the first air chamber, via a communication portion between lower end portions. A second air chamber that expands by flowing gas into the first air chamber, and first and second folds that cross the upper side of the communication portion and pass through the first and second air chambers. And is folded along the first and second folds and is folded from the lower edge toward the upper edge.
The present invention also includes an airbag attached along the vehicle front-rear direction in a state where the airbag is folded at an upper portion of the vehicle inner side wall, and an inflator that supplies gas to the airbag and inflates and deploys the vehicle downward. The airbag device includes a first air chamber formed at a rear side end portion in the vehicle front-rear direction, a communication portion adjacent to the front side of the first air chamber, and between lower end portions. A second air chamber that expands by injecting gas into the first air chamber through the cross section, crosses the first and second air chambers through the upper side of the communicating portion, and closes both air chambers to And a fold that is set so as to be able to block the flow. The fold is folded along the fold and is folded from the lower edge toward the upper edge.

  According to the present invention, the rear side end portion of the airbag that is inflated and deployed from above the vehicle can be normally deployed while preventing contact with the occupant, and the inner wall of the vehicle in the deployment range can be reliably and smoothly. The passenger can be protected by covering it.

It is a front view which shows typically the principal part of the airbag with which the airbag apparatus of this embodiment is provided. It is a front view which shows the folding procedure of the airbag of this embodiment. It is a front view which shows the other folding procedure of the airbag of this embodiment.

Hereinafter, an embodiment of an airbag device of the present invention will be described with reference to the drawings.
This airbag device is an airbag device that inflates and deploys an airbag from an upper portion of an inner side wall of a vehicle toward a lower side along the side wall, an airbag that can be inflated and deployed in a predetermined state, and an emergency vehicle And an inflator that generates gas when an impact is detected. In the following embodiments, an airbag (curtain airbag) is inflated and deployed from above the vehicle side part, and the airbag is deployed in a curtain shape in a predetermined range inside the vehicle side including the front seat to the rear seat. A side airbag device (curtain airbag device) for protecting a passenger in a seat around the head will be described as an example.

FIG. 1 is a front view schematically showing a main part of an airbag provided in the airbag device of the present embodiment, and shows a schematic shape of the airbag in a deployed state in a plan development view. Further, in FIG. 1, the internal configuration is also shown by seeing through the inside of the airbag.
In FIG. 1, the right side of the horizontally long airbag 10 is the rear side (rear pillar side) of the vehicle, and the opposite side (left side of the airbag 10 in the figure) is the front side (front pillar side) of the vehicle. Moreover, in the airbag apparatus 1 of this embodiment, the airbag 10 is arrange | positioned and accommodated in the roof rail part etc. (not shown) above a vehicle side part (upper side of the airbag 10 in the figure), and by introduction | transduction of gas, It expands and expands in the form of a curtain from the stored state toward the lower side of the vehicle. As a result, the airbag 10 is inflated and deployed so as to cover the entirety of the vehicle inner side wall (positioned on the back side in the drawing) (not shown) including the side window in the vehicle, It expands and develops between the side wall and the like.

  As shown in the figure, the airbag 10 is formed in a horizontally long bag shape having a shape corresponding to the shape of the window portion on the inner wall of the vehicle to be covered, and is attached to the roof rail portion of the vehicle along the upper edge (see FIG. 8) the rectangular upper mounting pieces 11 are provided. The airbag 10 has a substantially triangular protruding piece 12 protruding toward the front side of the vehicle, and a front attachment piece 13 attached to the front pillar portion of the vehicle is provided on the upper edge thereof. The airbag 10 has the attachment pieces 11 and 13 fixed to predetermined positions in the vehicle by fixing means such as bolts, and attached to the upper part of the vehicle inner wall along the vehicle front-rear direction. In the state, it is housed in a trim provided in each part of the vehicle. At that time, as will be described later, the airbag 10 is folded so as to be inflatable and deployable mainly under the vehicle from the lower edge toward the upper edge (the mounting pieces 11 and 13 side) in a predetermined procedure. It is attached to the vehicle in a state.

  Therefore, when the airbag apparatus 1 is not in operation, the airbag 10 and the inflator are stored in a predetermined state to cover the inside of the vehicle, and the trim attached to the roof rail portion along the storage position, the airbag 10 and the inflator are mounted on the vehicle. There are fixing means (not shown) for fixing to each other. The airbag device 1 is mounted on a vehicle together with these components, and in the event of a vehicle emergency, the inflator is operated to supply gas to the airbag 10 to inflate and deploy the folded airbag 10. Along with this, the airbag 10 is inflated from the stored state to push open the trim, and then deploys mainly downward from the vehicle.

  Such an airbag 10 is formed by, for example, overlapping two identical base fabrics formed by cutting a base fabric coated with resin, or folding one symmetrical base fabric, The opposing base fabrics are joined together in a gas-tight manner at predetermined positions, such as by sewing or adhering to each other, and an inflatable portion 30 is formed between them.

  In the present embodiment, the airbag 10 is composed of an occupant-side front side base fabric 20 and a back side base fabric 21 on the vehicle inner side wall, and the base fabrics 20, 21 facing each other are overlapped. Are joined along the outer edge joint portion 22. The outer edge joint portion 22 is a joint portion that defines the outer edge shape of the inflatable portion 30 by partitioning the inside and outside of the airbag 10, and along the position corresponding to the outer edge portion of the inflatable portion 30 to be formed, the base fabric 20. , 21 are formed by sewing one or more rounds. Thereby, the expansion part 30 is arrange | positioned in order from the vehicle front side to the back side, respectively, the front expansion part 31, the intermediate expansion part 32, the rear expansion part 33, and each expansion part 31, which are respectively substantially rectangular in a plan view. It consists of a connecting portion 34 along the upper edge of the airbag 10 that connects 32 and 33, and is formed in a bag shape continuous in the front-rear direction of the vehicle. Further, in the airbag 10, the front inflating portion 31, the intermediate inflating portion 32, and the rear inflating portion 33 are partitioned in order such that the width in the vehicle front-rear direction is narrowed, and the range in which the occupant should be protected in the vehicle, respectively. The front inflatable portion 31 mainly protects the front seat occupant and the other inflatable portions 32 and 33 mainly protect the rear seat occupant. In that case, the range of the rear side of the rear inflating part 33 (here, the range of the rear side of the upper mounting piece 11 positioned at the rearmost part in the vehicle) is positioned on the vehicle interior side of the pillar garnish of the rear pillar.

  In addition, in the airbag 10, a gas introduction port 14 communicating with the connection portion 34 is provided above the intermediate inflating portion 32, and a gas generated by an inflator (not shown) is introduced into the inside from the gas introduction port 14. Then, it is supplied to the inflating part 30 and flows in. The gas introduction port 14 projects the base fabrics 20 and 21 upward from the upper edge of the airbag 10 and continuously joins the outer edge joint portion 22 along the edge portion, thereby opening the rear side of the vehicle. Formed. The airbag apparatus 1 inserts one end (gas ejection port) of a cylindrical cylinder-type inflator into the gas introduction port 14 with, for example, a gas guide member or a rectifying member interposed therebetween, Collectively, it is fastened and fixed from the outside by a clamp (band) (not shown). In this manner, the inflator is attached to the gas introduction port 14 in an airtight manner, and the gas generated by the inflator is sequentially introduced from the gas introduction port 14 through the connecting portion 34 to the respective expansion portions 31, 32, and 33, The airbag 10 is inflated and deployed by supplying gas.

  In the airbag 10, the opposing base fabrics 20 and 21 are joined to each other by sewing or the like at inner joint portions 23 to 28 that are sequentially provided in the inflatable portion 30 from the front side of the vehicle. The portion 30 is partitioned at least on both sides thereof. The inner joint portions 23 to 28 are each configured such that the end portions in the inflatable portion 30 are joined in an annular shape and are spaced apart from each other in the vehicle front-rear direction to form a gas flow path and an air chamber in the inflatable portion 30. As a function. In addition, the inner joint portions 23 to 28 also have a function of restricting the expanded shape by suppressing the expansion of the expansion portion 30 in the vehicle width direction (the direction orthogonal to the paper surface in the drawing), and have a predetermined shape according to each purpose. And one or a plurality of them are arranged at predetermined positions in the inflatable portion 30.

  Here, two inner joint portions 23 and 24 whose upper ends are connected to the outer edge joint portion 22 and inner joint portions 25 whose both ends are internally provided are provided in the front expansion portion 31. Thereby, the front expansion part 31 is partitioned into two air chambers 31A and 31B whose upper ends are closed and two air chambers 31C and 31D whose upper and lower sides are open. On the other hand, the intermediate expansion portion 32 includes two inner chambers 32A and 32C whose upper ends are closed by an inner joint portion 26 whose upper end is connected to the outer edge joint portion 22, and an inverted U-shaped inner joint portion 27, and both upper and lower sides. Is divided into two air chambers 32B and 32D, which are alternately arranged along the vehicle longitudinal direction.

  On the other hand, the interior of the rear inflating portion 33 is partitioned by one inner joint portion 28 provided at a substantially central portion in the vehicle front-rear direction, and the two cylindrical air chambers 33A and 33B are arranged on the vehicle rear side. It is arranged in parallel on the front side. The inner joint portion 28 extends from the upper end connected to the outer edge joint portion 22 while being inclined toward the vehicle rear side toward the vehicle lower side, and the lower end terminates in the rear inflatable portion 33 and is formed at the lower end. The portion 28A is disposed at a predetermined position away from the outer edge joint portion 22 on the lower edge side. The rear inflating portion 33 is adjacent to the first air chamber (rear end air chamber) 33A disposed at the rear end portion in the vehicle front-rear direction of the airbag 10 with the inner joint portion 28 interposed therebetween, and the front side thereof. The second air chambers (adjacent air chambers) 33B arranged in this manner are formed in a rectangular shape in plan view so as to extend in the vertical direction. Further, the rear inflating portion 33 is provided with a communicating portion 33C that communicates the lower end portions (the lower end or the vicinity thereof) of the air chambers 33A and 33B. The communication portion 33 </ b> C is a communication hole or a gas passage through which the gas chambers 33 </ b> A and 33 </ b> B communicate with each other to circulate gas, and is formed near the lower edge of the airbag 10.

  In the airbag 10, the air chambers 33 </ b> A and 33 </ b> B are formed so as to be inclined toward the vehicle front side from the lower edge side to the upper edge side of the airbag 10. Further, the base fabrics 20 and 21 between the lower end of the inner joint portion 28 (annular joint portion 28A) and the outer edge joint portion 22 are not joined, and the air chambers 33A and 33B are communicated with each other in the non-joined region. 33C is configured. Further, the second air chamber 33B is expanded by the gas flowing in from the upper end side, and the gas flowing toward the lower end side is transferred to the first air chamber 33A via the communication portion 33C between the lower end portions. Inflow from. This gas flows in the first air chamber 33A from the lower end portion toward the upper end side, and is filled in the first air chamber 33A, so that the first air chamber 33A expands the second air chamber 33B. Then it expands.

  In the airbag device 1 configured as described above, the airbag 10 is folded from the lower edge side to the upper edge side in order to be accordion-folded before being attached to the vehicle, or from the lower edge toward the upper edge. It is folded into a shape that can be inflated and deployed below the vehicle and attachable to the vehicle, such as being wound around the inner wall and being folded (outer roll). At that time, the airbag 10 is folded from the lower edge toward the upper edge after the range on the rear side of the vehicle is folded along the first and second folds 40 and 41 around the rear inflating portion 33. It is. These first and second folds 40 and 41 cross each other through the non-communication portion (inner joint portion 28) on the upper side of the communication portion 33C, and pass through the first and second air chambers 33A and 33B, respectively. In such a manner, they are set in different directions.

  In the present embodiment, the first and second folds 40 and 41 define an upper edge portion (upper end portion) located at the upper end of the communication portion 33C, that is, the first and second air chambers 33A and 33B. It is the lower end of the boundary, and is set so as to intersect within the annular joint 28A of the inner joint 28. Further, when the airbag 10 is folded back, the first fold line 40 closes the communication portion 33C, and gas flows into the first air chamber 33A from the second air chamber 33B via the communication portion 33C. Is set so as to be inclined in the vertical direction. Here, the first fold line 40 is directed in a direction relatively close to the vertical direction of the vehicle, is inclined rearward in the vehicle front-rear direction from the lower edge side of the airbag 10 toward the upper edge side, and the annular joint portion 28A. The lower side is set at a position close to the communication portion 33C and intersects with the lower edge of the second air chamber 33B. The airbag 10 is folded back at the first fold 40, and the communication portion 33C is closed on the second air chamber 33B side by folding back below the annular joint portion 28A.

  On the other hand, the second fold line 41 extends across the first and second air chambers 33A, 33B, and when the airbag 10 is folded back, the air chambers 33A, 33B are moved in the middle in the longitudinal direction. It is set so as to incline in the front-rear direction of the vehicle so that the gas flow in the air chambers 33A, 33B can be blocked by blocking. Here, the second crease 41 is directed in a direction relatively close to the front-rear direction of the vehicle and is inclined in the same manner as the first crease 40. Further, the second fold line 41 has an air bag whose both sides sandwiching the annular joint portion 28A cross the first and second air chambers 33A and 33B in the vehicle front-rear direction and straddle both air chambers 33A and 33B. 10 is set on the lower edge side. In addition, the second fold line 41 is set in a direction orthogonal to the longitudinal direction of the second air chamber 33B so as to be orthogonal to the gas flow direction in the second air chamber 33B.

FIG. 2 is a front view schematically showing the folding procedure of the airbag 10.
In the present embodiment, first, the airbag 10 (see FIG. 1) is spread and flattened. Next, at the first fold 40, the rear end of the airbag 10 in the vehicle front-rear direction is folded back toward the front (see FIG. 2A), and the rear side across the first fold 40 is overlapped on the front side. Match. Subsequently, the second fold 41 is folded back with the lower edge side of the airbag 10 facing the upper edge side (see FIG. 2B), and the lower edge side sandwiching the second fold line 41 is overlapped with the upper edge side. As described above, after the airbag 10 is folded back to the passenger side (the front base fabric 20 side) in the order of the first fold line 40 and the second fold line 41, the entire airbag 10 is From the top to the top edge, the product is wound around the vehicle inner wall side (back side base fabric 21 side), folded and folded.

  The first fold 40 satisfies the above-described conditions, and the folding length of the airbag 10 in the vehicle front-rear direction (length along the vehicle front-rear direction of the folded portion) (length L in FIG. 2A). Is set at a predetermined position in the rear inflating portion 33 so as to be shortest. Moreover, in the state which folded the airbag 10, the wrapping material which can be fractured | ruptured in order to prevent collapse of a folding shape is suitably wound around several places of the longitudinal direction, and folding work is complete | finished.

  The airbag device 1 includes an airbag 10 attached to a roof rail portion and a front pillar portion at the upper portion of the vehicle inner wall along the vehicle front-rear direction along with an inflator attached to the gas introduction port 14, and the like. And is mounted on the vehicle. Thereafter, the airbag device 1 operates the inflator in the event of a vehicle collision or emergency to generate gas, and supplies the gas into the airbag 10 (inflatable portion 30) via the connecting portion 34 as described above. As a result, gas is introduced into each of the inflating portions 31, 32, 33 to inflate, and the airbag 10 can be lifted from the side of the mounting pieces 11, 13 attached to the vehicle while eliminating its folded shape. It is inflated and deployed in a curtain shape toward the vehicle interior in the direction. In this way, the airbag 10 is inflated and deployed between the occupant and the vehicle inner wall, etc., and the occupant invading is received by the inflated airbag 10, and the occupant is mainly restrained and protected mainly at the head. To do.

  At the time of inflating and deploying, the airbag 10 is deployed mainly in the reverse order of the folding to eliminate the folded shape, and first, the entire airbag 10 is deployed toward the lower side of the vehicle. In response to this deployment, gas flows into the second air chamber 33B of the rear inflating portion 33 from the upper side, and the second air chamber 33B is inflated downward to expand the pressure of the gas and the airbag 10. The second fold line 41 is unfolded due to the force associated with. As a result of this deployment, the folding of the second fold line 41 is eliminated, the second air chamber 33B is expanded, and the gas reaches the first fold line 40. At that time, since the gas is blocked by the first fold 40, the gas does not immediately flow into the first air chamber 33A, and after the second air chamber 33B expands to the lower end, the second fold 41 and Similarly, the first crease 40 is unfolded and the folding is eliminated. Along with this, the folded back rear end of the airbag 10 develops from the vehicle front side toward the rear side, and the range covers the pillar garnish of the rear pillar from the vehicle interior. In addition, gas flows into the first air chamber 33A from the lower end to the upper side through the communication portion 33C, and the first air chamber 33A expands on the side of the pillar garnish compartment, and between the passenger and the passenger It expands and expands.

  Thus, in the airbag device 1 of the present embodiment, when the airbag 10 is first deployed downward in the vehicle, the rear side end portion of the airbag 10 is folded back to the front side. The entire airbag 10 is deployed downward without being caught by the pillar garnish protruding into the room. At that time, since the first air chamber 33A and the second air chamber 33B at the rear end of the airbag 10 are folded and overlapped by the two folds 40 and 41, the rear end is folded more firmly. The shape becomes difficult to be eliminated, and the folded state can be reliably maintained when deployed downward. Further, since the gas flow in the air chambers 33A and 33B is blocked at a plurality of locations by the folds 40 and 41, it is possible to effectively block the gas from flowing into the first air chamber 33A at the initial stage of deployment. At the same time, since both the folds 40, 41 cross above the communication part 33C, the gas path of the second air chamber 33B can be closed at two places by the folds 40, 41, and the gas reaches the communication part 33C. Thus, the flow into the first air chamber 33A can be more reliably blocked.

  As a result, the rear end can be maintained in the folded state until the downward deployment of the airbag 10 is completed, and the expansion of the first air chamber 33A is delayed to reliably prevent the pillar garnish from being caught. can do. In addition, since the rear side end of the airbag 10 is deployed so as to cover the pillar garnish from the vehicle interior after the downward deployment, the airbag 10 that is inflated and deployed can reliably cover the pillar garnish. The entire bag 10 can be inflated and deployed smoothly with the occupant. Further, in the airbag 10, when the second fold 41 is unfolded and the second air chamber 33 </ b> B is inflated, the gas flows up to the first fold 40 and the first fold 40 has a force to cancel the fold. Acts, the folding is eliminated and the first air chamber 33A expands. Thus, since the second air chamber 33B and the first air chamber 33A are inflated in order along the gas flow path, the rear side end portion of the airbag 10 is accurately deployed according to each inflation ( Expansion).

  In addition, in this airbag apparatus 1, since the rear side end portion of the airbag 10 is folded back by the two folds 40, 41, a sufficient folding amount capable of preventing contact with the pillar garnish without largely folding the range. Can be secured. Therefore, the rear side end portion of the airbag 10 to be deployed does not greatly enter the occupant side, and contact with the occupant can be prevented, and the airbag 10 can be folded in a compact manner and appropriately disposed in the vehicle. In addition, since the folding of the rear end of the airbag 10 is canceled in two folds 40 and 41 in order and deployed in two stages, it is possible to suppress each deployment speed including elimination of the folds 40 and 41 from being increased. Thus, it is possible to prevent the rear side end portion from expanding to the opposite side and being reversed to the vehicle inner wall side. At the same time, when the second air chamber 33B expands, the portion folded and overlapped by the both folds 40 and 41 expands while being rubbed with the portion sandwiching them, so that the expansion speed is relaxed by friction, and the speed is reduced. The effect which suppresses the rise of is acquired. Along with this, the airbag 10 can be normally and accurately deployed, and the pillar garnish can be reliably covered by the rear side end portion.

  As described above, according to the present embodiment, the rear side end portion of the airbag 10 that is inflated and deployed from the top to the bottom of the vehicle can be normally deployed while preventing contact with the occupant. An occupant can be protected by reliably and smoothly covering the inner wall of the vehicle in the deployed range. In the airbag device 1, since the airbag 10 is folded back in the order of the first fold 40 and the second fold 41, the second fold 41 is deployed first at the time of deployment. The cancellation of the folding can be delayed, and the expansion of the first air chamber 33A and the contact with the pillar garnish can be reliably prevented. In addition, since the first fold 40 is set so as to close the communication portion 33C and the second fold 41 is set so as to close the second air chamber 33B, the gas flowing toward the first air chamber 33A By blocking the flow in order along the path, the inflow into the first air chamber 33A can be effectively prevented.

  Here, it is desirable that the first fold 40 is set so that the folding length L in the vehicle longitudinal direction of the airbag 10 is the shortest. Thereby, when the rear side end part of the airbag 10 is deployed, the length of entering the occupant side can be shortened, and contact with the occupant can be more reliably prevented. Further, when the second fold line 41 is set so as to be orthogonal to the gas flow direction in the second air chamber 33B, the effect of blocking the gas flow is increased, and the gas to the first air chamber 33A is increased. The airbag 10 can be inflated and deployed more smoothly by delaying the start of inflow and inflation. Further, the airbag 10 can be rolled along the inner wall of the vehicle by winding the airbag 10 from the lower edge toward the upper edge on the side of the inner wall of the vehicle, and the airbag 10 can be deployed along the inner wall of the vehicle. It can be smoothly and quickly deployed between the occupant and the vehicle inner wall.

In the present embodiment, the airbag 10 is folded at the first fold 40 and then folded at the second fold 41, but may be folded in the reverse order.
FIG. 3 is a front view showing the procedure for folding the airbag 10 in this way.
Here, the airbag 10 is first folded along the second fold line 41 (see FIG. 3A), and then folded back along the first fold line 40 (see FIG. 3B). Fold it from the top to the top edge.

  When the airbag 10 folded in this procedure is inflated and deployed, the airbag 10 is deployed below the vehicle, gas flows into the second air chamber 33B, and the second air chamber 33B is inflated downward from above. Along with this, the folding of the first fold 40 is eliminated and the rear side end portion of the airbag 10 is deployed on the rear side of the vehicle. The second air chamber 33B expands to the second fold line 41 without the air chamber 33A expanding. Subsequently, the folding of the second crease 41 is eliminated, the entire second air chamber 33B is expanded, and the gas flows into the first air chamber 33A and expands upward from the lower end portion. Then, the whole expands and expands so as to cover the pillar garnish from the vehicle interior side.

  At that time, since the folding of the first fold 40 is canceled during the deployment of the airbag 10, when the first air chamber 33A is inflated, the range is deployed at a high speed and deployed to the vehicle inner wall side. It is possible to prevent catching on pillar garnish and the like. As described above, the airbag 10 may be folded back in any order along the first and second fold lines 40 and 41, and the same effects as those described above can be obtained regardless of the order of folding.

  Further, the airbag 10 may be folded and folded only by the second fold 41 without providing the first fold 40. That is, the airbag 10 crosses the first and second air chambers 33A and 33B through the upper side (here, the upper end portion) of the communication portion 33C, blocks both the air chambers 33A and 33B, and blocks the gas flow. You may fold along the 2nd crease | fold 41 set as possible, and you may fold toward the upper edge from a lower edge. In this case, by folding the airbag 10 from the lower edge toward the upper edge by the above-described bellows fold or roll fold, the folding along the second fold line 41 is suppressed, and the airbag 10 is deployed downward. The folding at the second fold line 41 is maintained until the folded shape is eliminated. As a result, the second air chamber 33B can be blocked in the middle to block the gas flow, and the inflow of gas into the first air chamber 33A and the expansion associated therewith are delayed to sufficiently prevent the pillar garnish from being caught. can do. Further, the rear end portion of the airbag 10 does not greatly enter the occupant side during deployment, and contact with the occupant can be prevented. When the airbag 10 is wound around the inner side wall of the vehicle from the lower edge toward the upper edge and is folded and folded, the folding along the second fold line 41 is wound together with the roll and effectively suppressed. Can do. At the same time, since the airbag 10 is deployed in order from the upper edge toward the lower edge as the roll fold is eliminated, the folding at the second fold line 41 is reliably maintained until the airbag 10 is deployed downward. be able to.

  DESCRIPTION OF SYMBOLS 1 ... Airbag apparatus, 10 ... Airbag, 11 ... Upper attachment piece, 12 ... Projection piece, 13 ... Front part attachment piece, 14 ... Gas introduction port, 20 ... -Front side base fabric, 21 ... Back side base fabric, 22 ... Outer edge joint part, 23-28 ... Inner joint part, 28A ... Ring joint part, 30 ... Expansion part, 31 ... Front expansion part, 31A, 31B, 31C, 31D ... Air chamber, 32 ... Intermediate expansion part, 32A, 32B, 32C, 32D ... Air chamber, 33 ... Rear expansion part, 33A ... -1st air chamber, 33B ... 2nd air chamber, 33C ... communication part, 34 ... connection part, 40 ... 1st crease, 41 ... 2nd crease | fold.

Claims (7)

An airbag device comprising an airbag attached along the vehicle front-rear direction in a state of being folded on an upper portion of a vehicle inner wall, and an inflator that supplies gas to the airbag and inflates and deploys the vehicle downward. There,
The airbag is adjacent to the first air chamber formed at the rear side end in the vehicle front-rear direction and the front side of the first air chamber, and is connected to the first air chamber via the communication portion between the lower ends. A second air chamber that is inflated by inflowing gas; and first and second folds that cross the upper side of the communication portion and pass through the first and second air chambers, An airbag device that is folded along a second fold and is folded from a lower edge toward an upper edge. In the airbag apparatus described in Claim 1,
The first fold is set so as to be able to block the inflow of gas from the second air chamber to the first air chamber by closing the communication portion,
The airbag device is characterized in that the second fold is set so as to block both air chambers across the first and second air chambers and to block the flow of gas in both air chambers. In the airbag apparatus described in Claim 2,
The airbag device is folded back in the order of the first fold and the second fold. In the airbag apparatus described in Claim 2 or 3,
The airbag is folded back with the first fold toward the front side at the rear end in the vehicle front-rear direction.
The airbag apparatus according to claim 1, wherein the first fold is set so that the folding length of the airbag in the vehicle front-rear direction is the shortest. In the airbag apparatus as described in any one of Claim 2 thru | or 4,
The airbag device, wherein the second fold is set to be orthogonal to a gas flow direction in the second air chamber. In the airbag apparatus as described in any one of Claim 1 thru | or 5,
An airbag device is wound around a vehicle inner wall side from a lower edge toward an upper edge, is rolled and folded, and is folded. An airbag device comprising an airbag attached along the vehicle front-rear direction in a state of being folded on an upper portion of a vehicle inner wall, and an inflator that supplies gas to the airbag and inflates and deploys the vehicle downward. There,
The airbag is adjacent to the first air chamber formed at the rear side end in the vehicle front-rear direction and the front side of the first air chamber, and is connected to the first air chamber via the communication portion between the lower ends. A second air chamber that is inflated by inflow of gas, and a fold that is set so as to cross the first and second air chambers through the upper side of the communicating portion and to block the gas flow by closing both air chambers The airbag device is folded along a crease and folded from the lower edge toward the upper edge.

Images