JP2013249025A - Curtain airbag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly develop a curtain airbag by adequately transforming a member that covers an end of a longitudinal direction of the curtain airbag that is folded and stored in a minute length shape during inflation deployment.SOLUTION: A jet nozzle 28A jets the gas forward right under the edge 24A along the edge 24A. An air chamber 30 is formed with a pair of opposing clothes 24 in a vehicle width direction and contains a front air chamber 30A, a gas introduction road 30B, and a back air chamber 30C. An upper end air chamber 32 that extends right under the edge 24A along the edge 24A is formed with the upper end portion of the front air chamber 30A, the upper end portion of the gas introduction road 30B, and the upper end portion of the back air chamber 30C. A pair of clothes 24 are coupled with a part near the front end of the upper end air chamber 32 to which the jet nozzle 28A is turned and the part near the edge 24A, and an air flow adjusting structure 36 that inclines the direction of the air flow of the gas that is gushed from the jet nozzle 28A downward, and decreases the amount of the other side air flow to the front end of upper end air chamber 32 is installed.

Description

  The present invention relates to a curtain airbag.

2. Description of the Related Art A curtain airbag that protects an occupant's head by inflating and deploying along the windows of side doors before and after a vehicle by injecting gas is known (see Patent Documents 1 and 2).
This type of curtain airbag expands and deploys downward from the storage state, which is folded at the upper part of the side part of the passenger compartment and extends in the longitudinal direction, by the gas ejected from the ejection port of the gas introduction path. Then, the air chamber is formed by a pair of cloths facing each other in the direction connecting the vehicle interior and the exterior of the vehicle interior.

The edge of the cloth located opposite to the direction in which the curtain airbag is deployed is attached to the upper part of the side part in the vehicle interior, and the air chamber extends along the edge just below the edge. have.
Curtain airbags are often folded and stored in the interior of the passenger compartment across the front pillar, roof side rail, and rear pillar, and the folded curtain airbag is composed of a front pillar garnish, a ceiling material (head) Lining), covered with interior materials such as rear pillar garnish.
The curtain airbag in the housed state is inflated by injecting gas, and the inflating force pushes and opens the interior material.

JP 2007-161163 A JP 2010-36629 A

By the way, among the interior materials, the ceiling material is formed of a relatively soft material. Therefore, in the middle portion in the longitudinal direction of the curtain airbag that is folded and stored in a slender shape, when the curtain airbag is inflated Even when subjected to force, the interior material easily deforms.
On the other hand, the front pillar garnish and the rear pillar garnish are made of a relatively hard synthetic resin. Therefore, in the front garnish in which the end of the folded curtain airbag is stored, the expansion of the curtain airbag is performed. In order to cope with it sometimes, for example, it is necessary to take various measures against the garnish mounting structure, the shape of the garnish, etc., which causes an increase in cost.
The present invention has been made in view of the above circumstances, and at the time of inflation and deployment, the member covering the end in the longitudinal direction of the curtain airbag that is folded and stored in an elongated shape is appropriately deformed to accurately secure the curtain airbag. It is an object of the present invention to provide a curtain airbag that is advantageous in deploying.

In order to achieve the above-mentioned object, the invention according to claim 1 is based on the gas ejected from the ejection port from the stowed state folded in the upper part of the passenger compartment and extending in the longitudinal direction of the vehicle or in the width direction of the vehicle. Inflated and deployed downward, and in an expanded and deployed state in which an air chamber is formed by a pair of fabrics facing each other in the direction connecting the vehicle interior and the exterior of the vehicle interior, the edge of the fabric positioned opposite to the deployment direction It is attached to the vehicle body side, and the ejection port is arranged so that gas is ejected along the edge immediately below the edge, and the air chamber extends along the edge just below the edge. A curtain airbag having an upper end air chamber extending in a direction close to an end portion of the upper end air chamber in the extending direction of the upper end air chamber and directed near the edge portion. The direction of the gas flow ejected from Wherein the air flow adjusting structure to reduce the amount of the air flow towards the end of the extending direction of the air chamber.
The invention according to claim 2 is characterized in that the airflow adjustment structure is formed of a non-inflatable portion that is provided in the air chamber and connects opposing portions of the pair of cloths.

According to the first aspect of the present invention, the direction of the airflow of the gas ejected from the ejection port is tilted downward by the airflow adjusting structure, and the end of the upper air chamber extends in the extending direction. Since the amount of the air flow is reduced, the flow rate of the gas flowing to the end of the upper air chamber is limited, and the flow rate of the gas flowing to the air chamber below the upper air chamber is promoted.
Therefore, when the end in the extending direction of the upper air chamber expands, the force applied to the member covering the end from the end in the extending direction of the upper air chamber is limited, and the member covering the end is the original Deformed as designed, the curtain airbag expands and deploys downward by pushing the members open.
In addition, since the flow rate of the gas flowing into the air chamber below the upper air chamber is promoted on the jet outlet side of the air flow adjustment structure, the air chamber portion below the upper air chamber on the jet outlet side of the air flow adjustment structure. Expansion and deployment are performed smoothly.
Therefore, at the time of inflating and deploying, the member covering the end portion in the longitudinal direction of the curtain airbag folded and stored in an elongated shape is appropriately deformed, which is advantageous in accurately deploying the curtain airbag.

  According to the second aspect of the present invention, since the airflow adjustment structure is constituted by the non-inflatable portions that connect the opposing portions of the pair of cloths, it is advantageous in easily manufacturing the airflow adjustment structure.

It is explanatory drawing which shows the accommodation state of the curtain airbag 22 in 1st Embodiment. It is AA sectional view taken on the line of FIG. (A), (B) is sectional drawing of the curtain airbag 22 which shows another folding state. It is explanatory drawing which shows the state which expand | deployed the curtain airbag 22 without putting gas from the state in which the edge part 24A was attached to the vehicle body side. It is explanatory drawing which shows the state which expand | deployed the curtain airbag 22 without putting gas. (A)-(D) is explanatory drawing which shows the expansion | deployment operation | movement of the curtain airbag 22 in 1st Embodiment in steps. (A)-(D) are explanatory drawings which show the expansion | deployment operation | movement of the curtain airbag 22 in a comparative example in steps. It is explanatory drawing which shows the state which expand | deployed the curtain airbag 22A in 2nd Embodiment, without putting gas.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a case will be described in which the curtain airbag is a curtain airbag that is deployed in a planar shape on the side of the occupant to protect the occupant when subjected to an impact such as a side collision.
As shown in FIG. 1, a front pillar 2, a center pillar 4, and a rear pillar 6 are provided on the side of the vehicle interior at intervals in the front-rear direction of the vehicle, and upper ends of the front pillar 2, center pillar 4, and rear pillar 6. Is connected to the roof side rail 8.

  A front pillar garnish 10 (see FIG. 2) made of synthetic resin, a center pillar garnish (not shown), and a rear pillar garnish (not shown) are mounted on the vehicle interior side of the front pillar 2, the center pillar 4, and the rear pillar 6, respectively.

  Further, the vehicle interior side of the roof side rail 8 is covered with a side portion of a ceiling material (not shown). As the ceiling material, for example, a cardboard-like base material provided with a cushion material and a skin is formed into a predetermined shape.

  The curtain airbag device 20 includes a curtain airbag 22, an inflator (not shown), and a sleeve (not shown).

The curtain airbag 22 is folded at the upper part of the vehicle interior and extended in a slender shape in the longitudinal direction of the vehicle. The curtain airbag 22 is expanded and expanded downward by the gas ejected from the gas ejection port 28A (see FIG. 4). To do.
The accommodated curtain airbag 22 is accommodated in a sleeve (not shown) and is provided on the vehicle interior side of the front pillar 2, the roof side rail 8, and the rear pillar 6.
A portion where the curtain airbag 22 in the housed state is located on the vehicle interior side of the front pillar 2 is covered with the front pillar garnish 10, and a portion located on the vehicle interior side of the roof side rail 8 is a side portion of the ceiling material. The portion of the rear pillar 6 located on the vehicle interior side is covered with the rear pillar garnish.

As shown in FIG. 2, the front pillar garnish 10 includes a main body portion 1002 extending along the front pillar 2, and a clip portion 1004 that protrudes from the upper side of the main body portion 1002 from the opposite side of the vehicle body of the main body portion 1002. And. The clip portion 1004 is inserted and locked in a locking hole 202 formed in the front pillar 2.
At the end of the front pillar garnish 10 located near the roof side rail 8, when the curtain airbag 22 is inflated, the clip portion 1004 comes out of the locking hole 202, and as shown by an imaginary line (A) in FIG. The front pillar garnish 10 is deformed so that the lower part of the front pillar garnish 10 is separated from the front pillar 2 so that the front end of the curtain airbag 22 is drawn downward from the front pillar garnish 10 as indicated by an imaginary line (b) in FIG. It is configured.
The structure of the front pillar garnish 10 is not limited to the above structure, and various conventionally known structures can be employed.

As shown in FIG. 2, the curtain airbag 22, in a folded state, has a guide fold portion 2202 and a protective fold portion 2204, and is folded into an elongated shape whose longitudinal direction is the front-rear direction of the vehicle.
The protective folding portion 2204 is configured by folding the curtain airbag 22 into an elongated cylindrical shape wound in a roll shape from the lower end portion.
The guide folding portion 2202 is folded in a plate shape so that the upper end portion of the curtain airbag 22 is crushed flat from the top and bottom as a whole, and further along the both sides of the protective folding portion 2204 from the upper side of the protective folding portion 2204. Thus, it is arranged so as to surround the protective folding part 2204 from the upper side.

The method of folding the curtain airbag 22 is not limited to the above method, and various conventionally known methods can be employed. For example, as shown in FIG. 3A, the curtain airbag 22 may be wound from the lower end in a roll shape and folded into a cylindrical shape, or as shown in FIG. The bag 22 may be folded in a bellows shape in a direction perpendicular to the longitudinal direction.
The rear pillar garnish has the same structure as the front pillar garnish 10 and is attached to the rear pillar 6 with the same configuration.

As shown in FIGS. 4 and 5, the curtain airbag 22 is formed into a bag shape by sewing the peripheral portions of two overlapped cloths 24 and joining them together with an adhesive, and inflates and deploys from the stored state. Thus, a passenger protection air chamber 30 is formed by a pair of cloths 24 opposed in the width direction of the vehicle.
The edge 24A of the cloth 24 positioned opposite to the direction in which the curtain airbag 22 is deployed from the stored state is attached to the roof side rail 8 on the vehicle body side via an attachment piece 26.

The curtain airbag 22 includes a conduit portion 28 into which gas is introduced from the inflator, and the ejection port 28A is formed by an opening portion of the conduit portion 28.
The conduit portion 28 extends along the edge 24A at the rear portion of the curtain airbag 22, and the gas jets out from the outlet 28A forward in the air chamber 30 along the edge 24A immediately below the edge 24A. It is arranged so that.
The air chamber 30 includes a front air chamber 30A, a gas introduction path 30B, and a rear air chamber 30C arranged in the front-rear direction, and the front air chamber 30A and the rear air chamber 30C are arranged below the gas introduction path 30B. Are connected by a non-expandable portion 30D.

The front air chamber 30A is an air chamber for front seat occupants corresponding to the front side glass, and the rear air chamber 30C is an air chamber for rear seat occupants corresponding to the rear side glass.
An intermediate sewing portion 34 is provided in the front air chamber 30A. The intermediate sewing portion 34 is a portion in which a pair of cloths 24 are partially sewn so as to maintain the thickness and shape of the front air chamber 30A. In the present embodiment, the intermediate sewing portion 34 is spaced in the front-rear direction. Two are provided.

Furthermore, the air chamber 30 has an upper air chamber 32 extending along the edge 24A immediately below the edge 24A.
The upper air chamber 32 is formed by an upper end portion of the front air chamber 30A along the edge 24A, an upper end portion of the gas introduction path 30B, and an upper end portion of the front end of the rear air chamber 30C.
Then, the direction of the gas air flow ejected from the ejection port 28A is curtained at a location near the front end that is the end in the extending direction of the upper end air chamber 32 to which the ejection port 28A is directed and close to the edge 24A. An airflow adjustment structure 36 is provided that is inclined downward in the direction in which the airbag 22 is deployed and reduces the amount of airflow toward the front end of the upper end air chamber 32.

The airflow adjustment structure 36 is composed of a non-expandable portion that connects the opposing portions of the pair of cloths 24 and prevents them from separating.
As described above, the airflow adjustment structure 36 is constituted by the non-inflatable portion that connects the opposing portions of the pair of cloths 24, which is advantageous in easily manufacturing the airflow adjustment structure 36.

  The non-inflatable portion can be configured by a cloth wall in which both ends are sewn to opposing portions of the pair of cloths 24. In other words, the non-expandable portion can be configured by connecting opposing portions of the pair of cloths 24 with cloth walls. The cloth wall has, for example, a rectangular shape, and is configured by sewing long sides on both sides to opposite portions of the pair of cloths 24. When the air chamber 30 is expanded, the pair of cloths 24 are formed by the cloth wall portions. The opposing portions of the cloth are constrained by the short side of the cloth wall and do not leave a dimension larger than the short side.

  Alternatively, the non-expandable portion can be configured by a joint portion that joins the opposing portions of the pair of cloths 24. The joining portion is formed by adhering the facing portions of the pair of cloths 24 with an adhesive, or by sandwiching a belt-like mediating member between the facing portions of the pair of cloths 24 and facing the mediating member and the pair of fabrics 24. It can comprise by adhering between the parts to perform with an adhesive material, or by sewing the part which a pair of cloth 24 opposes. That is, the non-expandable portion can be configured by connecting the opposing portions of the pair of cloths 24 using an adhesive or sewing.

In the present embodiment, the airflow adjustment structure 36 is configured by a joint portion (non-inflatable portion) in which the opposing portions of the pair of cloths 24 are sewn.
Both end portions of the intermediate sewing portion 34 and both end portions of the airflow adjusting structure 36 are sewn in a circular shape so as to relieve stress concentration applied to the end portions of the sewing portions 34 and 36 during expansion and deployment.

  The structure of the airflow adjustment structure 36 will be described in more detail. The front pillar garnish 10 is configured such that one end of the airflow adjustment structure 36 is located on the edge 24A side and the other end is located on the front end side of the upper end air chamber 32. It is tilted in the same direction as the tilt and is subjected to circular sewing to alleviate stress concentration at both ends.

  In the folded state in which the curtain airbag 22 is attached to the vehicle body, the sewing on the one end side of the airflow adjustment structure 36 is at least partly overlapped with the front pillar garnish 10 or the roof side rail 8 or even if it does not overlap. The gas flow rate passing through the upper air chamber 32 while being positioned is reduced, and the gas flow direction is provided not in the extended end portion of the upper air chamber 32 but in the downward direction.

In order to reduce the flow rate of the gas to the extended end of the upper air chamber 32, the distance from the edge 24A (outer peripheral sewing part) directly above the uppermost part in the vehicle vertical direction is between 50 mm and 100 mm. By constricting so that a remarkable effect can be obtained.
In this embodiment, this distance is set to 70 mm, but the numerical value as a result of the verification is described. However, the present invention is not limited to this as long as the structure on the vehicle body side or the installation position of the curtain airbag changes. If the gas flow rate to the extending end of the upper end air chamber 32 is reduced and the effect of flowing the gas downward along the airflow adjustment structure 36 is obtained, the numerical value setting outside the above-described range can be used. Of course, this is considered to be the same as described in the present invention.
The gas outlet 28A is formed by the opening of the conduit portion 28 in the present embodiment, but may be a gas outlet of an inflator.

Next, the effect of this Embodiment is demonstrated with reference to FIG.
When the curtain airbag 22 is stored and the vehicle is collided or rolls over and the inflator is operated and gas is supplied to the conduit portion 28, the gas is ejected from the ejection port 28A.
6A and 6B, the gas flows forward along the upper air chamber 32, while the lower rear air chamber 30C, the gas introduction path 30B, and the front air are discharged. It flows out into the chamber 30A.

Then, as shown in FIGS. 6C and 6D, the upper air chamber 32 expands and expands forward, and the rear air chamber 30C, the gas introduction passage 30B, and the front air chamber 30A face downward. Expand and expand.
That is, when gas from an inflator (not shown) is supplied to the conduit portion 28 and ejected from the ejection port 28A, the curtain airbag 22 starts to expand. As the behavior at that time, the gas ejected from the ejection port 28 </ b> A moves the upper air chamber 32 set along the edge 24 </ b> A that is the upper side of the curtain airbag 22 to the front end that is the end in the extending direction. The folded state of the curtain airbag 22 is released from the upper part to the lower part of the curtain airbag 22 by flowing in the direction.

In this process, after the gas is ejected from the ejection port 28A, it does not flow toward only the front end of the upper air chamber 32, but will be described with reference to FIG. 6B. Has started to flow in the direction of the rear air chamber 30 </ b> C, and the gas in the front air chamber 30 </ b> A located on the side close to the front end of the upper air chamber 32 also flows toward the front end of the upper air chamber 32. Since the release of the folded state has started in the process, the gas starts to flow.
In other words, the gas does not flow in a straight line toward the front end of the upper air chamber 32, but also flows downward into the upper air chamber 32 in the direction of each protective air chamber in which the folded state is released on the way to the front end. This occurs and flows in the curtain airbag 22 as shown by the arrow in FIG.

At that time, as in the present invention, the end of the upper end air chamber 32 in the extending direction is tilted downward at a position close to the end of the upper end air chamber 32 and close to the edge 24A. Since the airflow adjustment structure 36 that reduces the amount of airflow toward the front is provided, a larger amount of gas is directed downward than the amount of gas reaching the front end of the upper end air chamber 32, and the expansion of the front end air chamber 32A is further promoted. Will be done.
At that time, the rear pillar garnish is pushed open by the air chamber portion around the conduit portion 28.

Further, as shown in FIGS. 6B and 6C, the upper end air chamber constituting the upper end excluding the upper end of the front portion of the rear air chamber 30C, the upper end of the gas introduction passage 30B, and the front end of the front air chamber 30A. 32 part 32A pushes open the side part of a ceiling material.
Further, the front end portion 32B of the upper end air chamber 32 constituting the upper end of the front end of the front air chamber 30A pushes the front pillar garnish 10 open and expands and deploys downward.

As shown in FIG. 6B, since the jet outlet 28A is located at the upper end of the front part of the rear air chamber 30C, and the jet outlet 28A faces forward along the edge 24A, the curtain airbag 22 In the initial stage of the expansion, the flow rate of the gas flowing toward the front is larger than the flow rate of the gas flowing toward the rear air chamber 30C, which is the lower side.
For this reason, the rear part of the curtain airbag 22 covered and folded and stored with a hard rear pillar garnish is inflated and deployed more slowly than the front part of the curtain airbag 22, so that the rear pillar garnish is deformed as originally designed. The rear part of the curtain airbag 22 pushes and opens the rear pillar garnish to expand and deploy downward.

On the other hand, since the jet outlet 28A is directed to the front end of the upper end air chamber 32, the air flow from the jet outlet 28A easily flows out to the front end portion 32B along the upper end air chamber 32. Compared with the lower front air chamber 30A, the front end portion 32B of the upper end air chamber 32 is more easily expanded.
Therefore, in the present embodiment, the airflow adjusting structure 36 is the direction in which the curtain airbag 22 develops the direction of the airflow of the gas ejected from the ejection port 28A, as indicated by the arrow A in FIG. 6B. By tilting downward, the amount of airflow toward the front end of the upper air chamber 32 is reduced.

  The airflow adjustment structure 36 restricts the flow rate of the gas flowing to the front end portion 32B of the upper end air chamber 32 and flows to the front air chamber 30A below the upper end air chamber 32 on the jet outlet 28A side than the airflow adjustment structure 36. The portion of the front air chamber 30A located behind the airflow adjustment structure 36 is reliably expanded by the gas flow rate, and the front air chamber 30A including the front end portion 32B of the upper end air chamber 32 is expanded and deployed. Made smoothly.

  Therefore, when the front end portion 32B of the upper end air chamber 32 expands, the amount of expansion of the front end portion 32B decreases in accordance with the decrease in the gas flow rate, and the front end portion 32B of the upper end air chamber 32 changes to the front pillar garnish 10. The applied force is limited, and the front pillar garnish 10 is not pushed open with an unnecessarily large force. The front pillar garnish 10 is deformed as originally designed with a deformation amount necessary for the deployment of the curtain airbag 22, and the upper end air is discharged. Since the flow rate of the gas flowing into the front end air chamber 30A below the chamber 32 is increasing, the force applied in the direction in which the front end of the curtain airbag 22 is dragged out of the front pillar garnish 10 increases. The front portion of the airbag 22 pushes and opens the front pillar garnish 10 to expand and deploy downward.

Further, in the present embodiment, an end portion located on the edge 24A side of the airflow adjustment structure 36 is located immediately below the boundary between the front pillar garnish 10 and the side portion of the ceiling material.
Thus, when the curtain airbag 22 is inflated, the curtain airbag 22 is promoted to be inflated at a portion of the curtain airbag 22 that is located on the vehicle interior side of the roof side rail 8 and covered with the side portion of the ceiling material. Among them, the expansion of the portion covered with the front pillar garnish 10 is suppressed.
For this reason, the curtain airbag 22 is pulled out from the front pillar garnish 10 by following the portion covered with the front pillar garnish 10 from the side of the ceiling material, and the curtain airbag 22 is inflated. Therefore, it is more advantageous in suppressing the influence applied to the front pillar garnish 10.

In the present embodiment, the airflow adjustment structure 36 is inclined to the front pillar garnish 10 so that one end of the airflow adjustment structure 36 is located on the edge 24 </ b> A side and the other end is located on the front end side of the upper end air chamber 32. The case where it is inclined in the same direction as above has been described.
However, the airflow adjustment structure 36 may be a structure that guides gas from above to below, and the inclination direction of the airflow adjustment structure 36 is not limited. For example, when the curtain airbag 22 is shaped so as to incline backward as it goes downward, one end of the airflow adjustment structure 36 is positioned on the edge 24A side, and the other end is the upper end air chamber 32. The airflow adjustment structure 36 may be inclined in the same direction as the inclination of the front portion of the curtain airbag 22 so as to be positioned on the rear end side.

Next, a comparative example will be described with reference to FIG.
The comparative example is different from the curtain airbag 22 of the embodiment in that the airflow adjustment structure 36 is not provided, and is otherwise configured in the same manner as the curtain airbag 22 of the embodiment.
When the inflator is operated and the gas is supplied to the conduit portion 28 with the curtain airbag 22 stored, the gas is ejected from the ejection port 28A.
As shown in FIGS. 7A and 7B, the gas flows out to the front rear air chamber 30 </ b> C and the front air chamber 30 </ b> A while flowing out forward along the upper air chamber 32. .

As shown in FIGS. 7C and 7D, the upper air chamber 32 expands and expands forward, and the rear air chamber 30C and the front air chamber 30A expand and expand downward. To do.
Since the jet outlet 28A is directed to the front end of the upper air chamber 32, the air flow from the jet outlet 28A easily flows out to the front end along the upper air chamber 32 as shown by an arrow A in FIG. Compared to the front air chamber 30A below the upper air chamber 32, the front end portion 32B of the upper air chamber 32 is more easily expanded.

  Therefore, according to the curtain airbag 22 of the present embodiment, by providing the airflow adjustment structure 36, a member that covers the longitudinal end of the curtain airbag 22 that is folded and stored in an elongated shape when inflated and deployed. This is advantageous in appropriately deploying the curtain airbag 22 and deploying it appropriately. Therefore, it is not necessary to take various measures for the garnish mounting structure and the garnish shape in order to suppress the influence on the garnish, which is advantageous in reducing the cost.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the location and member similar to 1st Embodiment, and the description is abbreviate | omitted.
In the curtain airbag 22 </ b> A of the second embodiment, the conduit portion 28 is provided in the gas introduction passage 30 </ b> B that is an intermediate portion in the extending direction of the upper end air chamber 32, and the jet outlet 28 </ b> A extends in the upper end air chamber 32. Directed at both ends of the direction.
The airflow adjustment structure 36 is provided at a location near the front end and the rear end, which are both ends in the extending direction of the upper end air chamber 32, and at a location close to the edge portion 24A.

  In the second embodiment, since the spout 28A is directed to the front end and the rear end of the upper end air chamber 32, the airflow from the spout 28A easily flows out to the front end and the rear end along the upper end air chamber 32. Compared with the front air chamber 30A and the rear air chamber 30C below the upper air chamber 32, the front end portion 32B and the rear end portion 32C of the upper air chamber 32 are more easily expanded.

However, the direction of the flow of the gas ejected from the ejection port 28A is tilted downward, which is the direction in which the curtain airbag 22A is deployed, and the airflow that reduces the amount of the airflow toward the front end portion 32B and the rear end portion 32C of the upper end air chamber 32. Since the adjustment structure 36 is provided, the flow rate of the gas flowing through the front end portion 32B and the rear end portion 32C of the upper end air chamber 32 is limited.
Therefore, when the front end portion 32B and the rear end portion 32C of the upper end air chamber 32 expand, the force applied to the front pillar garnish 10 and the rear pillar garnish is limited, and the front pillar garnish 10 and the rear pillar garnish are deformed as originally designed. The front and rear portions of the curtain airbag 22A push the front pillar garnish 10 and the rear pillar garnish 10 open to expand and expand downward.

Further, in the front air chamber 30A, the flow rate of the gas flowing into the front air chamber 30A below the upper air chamber 32 on the jet outlet 28A side than the air flow adjusting structure 36 is promoted, and in the rear air chamber 30C, the air flow adjusting structure The flow rate of the gas flowing into the rear air chamber 30C below the upper air chamber 32 on the jet outlet 28A side than the 36 is accelerated.
Therefore, the expansion of the portion of the front air chamber 30A located behind the airflow adjustment structure 36 and the expansion of the portion of the rear air chamber 30C located in front of the airflow adjustment structure 36 are ensured, and the front portion including the front end Expansion and expansion of the rear air chamber 30C including the expansion and expansion of the air chamber 30A and the rear end are smoothly performed.
Therefore, also in the second embodiment, similarly to the first embodiment, a member that covers the end portion in the longitudinal direction of the curtain airbag 22A that is folded and stored in an elongated shape at the time of inflation and deployment is appropriately used. This is advantageous in accurately deforming the curtain airbag 22A and is advantageous in reducing costs.

The present invention is naturally applicable to a curtain airbag that is inflated from the state stored in the upper end of the rear glass along the vehicle width direction and deployed downward. In that case, the direction connecting the vehicle interior and the vehicle exterior, which is the direction in which the pair of cloths 24 forming the air chamber 30 face each other, is the front-rear direction of the vehicle.
When the jet outlet 28A is provided at one end in the extending direction of the upper end air chamber 32, the air flow adjusting structure 36 is provided on the other end side in the extending direction of the upper end air chamber 32 as in the first embodiment. Is provided. Further, in the case where two jet outlets 28A are provided opposite to each other at the intermediate portion in the extending direction of the upper air chamber 32, both ends in the extending direction of the upper air chamber 32 are provided, as in the second embodiment. An airflow adjustment structure 36 is provided on the side. Then, the rear pillar garnish is deformed as originally designed and pushed open to deploy the curtain airbag downward.

  2 ... Front pillar, 202 ... Locking hole, 24 ... Center pillar, 6 ... Rear pillar, 8 ... Roof side rail, 10 ... Front pillar garnish, 1002 ... Main body, 1004 ... Clip, 20 ... Curtain airbag device, 22, 22A ... Curtain airbag, 2202 ... Guide folding part, 2204 ... Protective folding part, 24 ... Cloth, 24A ... Edge part, 26 ... Mounting piece, 28 ... ... Conduit part, 28A ... outlet, 30 ... air chamber, 30A ... front air chamber, 30B ... gas inlet, 30C ... rear air chamber, 30D ... non-expandable part, 32 ... top air Chamber 32A... Upper end air chamber 32 portion 32B. Upper end air chamber 32 front end portion 32C. Upper end air chamber 32 rear end portion 34. Intermediate sewing portion 36.

Claims (2)

From the stowed state folded in the upper part of the vehicle interior and extending in the longitudinal direction of the vehicle or in the width direction of the vehicle, it expands and expands downward by the gas ejected from the ejection port, and In an inflated and deployed state where an air chamber is formed by a pair of cloths facing each other in the tying direction
The edge of the cloth positioned opposite to the unfolding direction is attached to the vehicle body side,
The spout is arranged so that gas is spouted along the edge just below the edge,
The air chamber is a curtain airbag having an upper air chamber extending along the edge just below the edge,
The upper end air is tilted downward at a location near the end in the extending direction of the upper end air chamber to which the outlet is directed and close to the edge portion. An airflow adjustment structure is provided to reduce the amount of the airflow toward the end in the extending direction of the chamber,
Curtain airbag characterized by that. The airflow adjustment structure includes a non-inflatable portion that is provided in the air chamber and connects opposing portions of the pair of cloths.
The curtain airbag according to claim 1.

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