WO2007060874A1

WO2007060874A1 - Curtain airbag for vehicle

Info

Publication number: WO2007060874A1
Application number: PCT/JP2006/322819
Authority: WO
Inventors: Yuichiro Yoshida
Original assignee: Autoliv Development Ab
Priority date: 2005-11-25
Filing date: 2006-11-16
Publication date: 2007-05-31
Also published as: JP5605804B2; JPWO2007060874A1

Abstract

[PROBLEMS] To provide a curtain airbag for a vehicle, in which a curtain airbag body can be expanded and inflated in an appropriate expansion direction with an appropriate expansion force in correspondence with a relationship between mounting conditions of the curtain airbag body on the vehicle and expansion/inflation performance required for the curtain airbag body. [MEANS FOR SOLVING PROBLEMS] The curtain airbag for a vehicle has a duct section (3) and a chamber section (4). The duct section (3) is formed at the upper portion of the curtain airbag body (1) and has a predetermined effective height H set along the direction of the length of the duct section. Gas is introduced into the duct section (3) from a gas introduction port (2). The chamber section (4) is formed at the lower portion of the curtain airbag body (1), and gas is introduced into the chamber section (4) from the duct section (3). A shift duct portion (3b) where the position in height relative to the curtain airbag body (1) is partially changed for a general duct portion (3a) is formed at the duct section (3).

Description

Specification

Curtain airbags for vehicles

Technical field

[0001] The present invention relates to the relationship between the installation state of the curtain airbag body in the vehicle and the deployment and inflation performance required for the curtain airbag body, and thus the curtain airbag body has an appropriate deployment force in an appropriate deployment direction. The present invention relates to a curtain airbag for a vehicle that can be expanded and inflated with the use of a vehicle.

Background art

Conventionally, Patent Document 1 is known as a curtain airbag. In Patent Document 1, the air nod curtain has a first side surface and a second side surface. The folding portion is provided adjacent to the first side surface, and the collar portion is provided adjacent to the second side surface of the airbag and on the side surface opposite to the folding portion. The connecting tabs can extend beyond the heel and fold from the edge of the bag airbag that easily attaches the airbag curtain to the vehicle as part of the airbag system. The first edge of the air bag curtain is folded to a position adjacent to the first side of the air nog curtain. The second edge of the air nogg curtain is wound towards the first edge until the collar is substantially adjacent to the fold on the opposite side of the air bag curtain. When the second edge portion of the airbag curtain is completely wound and stored, the heel portion and the folding portion are arranged on the opposite side surface at the fold portion of the airbag curtain.

[0003] In this structure, it is understood that the fold portion functions as a fulcrum when the airbag curtain is inflated because the air passage is adjacent to the first edge of the airbag curtain on the fold portion side of the fold portion. Will be done. By the expansion, the heel part is turned around the fold part so as to separate the folding part force. This action allows the airbag curtain to be sized to remove components inside the vehicle, such as the roof rail and headliner, before fully deploying. -And the fold of the airbag curtain will loosen if the heel part turns away from the folding force. This allows the gas to expand the saddle more completely and allow the saddle to extend to a position between the occupant and the vehicle side in an appropriate track without being obstructed in place.

[0004] Accordingly, the present invention deploys the airbag curtain to the correct position along an appropriate trajectory. Allow to do. The present invention also reduces the likelihood that the airbag curtain will fold on its own or interfere with components in the vehicle when inflated. When the airbag is completely wound, the height of the heel portion is substantially equal to the width of the folded portion.

Patent Document 1: JP 2005-510390

Disclosure of the invention

Problems to be solved by the invention

[0005] Curtain airbags are provided in a series from the front of the vehicle to the rear of the vehicle in a wound form as in the above background art. The shape of the passenger compartment varies depending on the vehicle type. Therefore, the relationship between the position where the curtain airbag is mounted and the position of the occupant seated in the passenger compartment varies. For example, the distance force between the occupant position and the curtain air nog mounting position may be far from the front seat but close to the rear seat. In such a case, the curtain airbag should be deployed directly under the front seat, but the rear seat should be slightly outward rather than directly under the rear seat to avoid interference with passengers. It is preferable to expand and expand toward it.

[0006] As another aspect, an opening that should be opened when the curtain airbag is deployed and inflated is formed in the ceiling of the vehicle. The relationship between the opening and the installation position of the curtain airbag The distance between the airbag mounting position and the opening may be close on the front seat side but far on the rear seat side. In such a case, a small deployment force is sufficient on the front seat side, but a large deployment force is required on the rear seat side.

[0007] As described above, even when the curtain airbags are provided in series over the vehicle front force and the vehicle rear, there is a problem that the performance required for the curtain airbag may differ between the vehicle front side and the vehicle rear side.

[0008] The present invention was devised in view of the above-described conventional problems, and is designed to correspond to the relationship between the mounting state of the curtain airbag body on the vehicle and the deployment and inflation performance required of the curtain airbag body. It is an object of the present invention to provide a curtain airbag for a vehicle that can be deployed and inflated with an appropriate deployment force in an appropriate deployment direction. Means for solving the problem

[0009] A curtain airbag for a vehicle according to the present invention is formed on an upper portion of a curtain airbag body. And a predetermined effective height dimension is set along the length direction, and the duct portion into which gas is introduced from the gas inlet and the lower portion of the curtain air nogg body are formed. A shift duct portion is formed in the duct portion in which the vertical height position relative to the curtain airbag body is partially changed with respect to the general duct portion. It is characterized by that.

[0010] Preferably, the shift duct portion of the duct portion is set at a seating position of an occupant. [0011] The shift duct portion of the duct portion is a stepped portion or an inclined portion with respect to the general duct portion. The height position in the vertical direction is changed via.

[0012] The curtain airbag main body is such that a part of the chamber is wound upward starting from a lower end thereof, and the duct part is folded over the wound side surface of the part of the wound chamber. The folded state is desirable.

The invention's effect

[0013] In the curtain airbag for a vehicle that is effective in the present invention, the curtain airbag body is adapted to the relationship between the state of the curtain airbag body mounted on the vehicle and the deployment and inflation performance required of the curtain airbag body. Can be expanded and expanded in an appropriate deployment direction with an appropriate deployment force.

BEST MODE FOR CARRYING OUT THE INVENTION

[0014] Hereinafter, a preferred embodiment of a vehicle curtain airbag according to the present invention will be described in detail with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the curtain airbag for a vehicle that is effective in the present embodiment basically has a predetermined effective height dimension H along the length direction at the top of the curtain airbag body 1. A duct portion 3 that is set and formed, and gas is introduced from the gas inlet 2; and a chamber portion 4 that is formed at the bottom of the curtain airbag body 1 and into which gas is introduced from the duct portion 3. The duct portion 3 is formed with a shift duct portion 3b in which the vertical height position with respect to the curtain airbag body 1 is partially changed with respect to the general duct portion 3a. The curtain air nog body 1 is wound by the chamber part 4 being wound upward by starting from the lower end 4a thereof, and the duct part 3 is folded over the wound side surface 4b of the wound chamber part 4. In a folded state. In this embodiment Thus, “upper” means the ceiling side of the passenger compartment, and “lower” means the floor side of the passenger compartment.

[0015] The curtain airbag main body 1 has a length dimension extending from the A pillar to the C pillar along the longitudinal direction of the vehicle, and a width dimension that passes through the window portion from the ceiling portion of the vehicle and reaches the bottom thereof. It is formed in a shape. The curtain airbag main body 1 is provided along the vehicle ceiling in a state of being wound and folded. A partition 5 is formed in the curtain airbag body 1. The partition 5 divides the duct portion 3 and the chamber part 4 in the vertical direction of the curtain airbag body 1 and divides the chambers 6 of the chamber part 4 in the longitudinal direction.

[0016] A duct portion 3 that communicates with a gas inlet 2 connected to an inflator that ejects gas is formed in an upper portion of the curtain airbag body 1 on the vehicle ceiling portion side. The force under the duct part 3 The lower part of the one-ten airbag main body 1 is formed with a chamber part 4 composed of a plurality of chambers 6 that communicate with the duct part 3 and expand and expand with the introduced gas. The duct portion 3 is formed over the entire length in the length direction of the curtain airbag main body 1 along the front-rear direction of the vehicle. Each chamber 6 of the chamber part 4 is divided into partitions 5 and formed in plural along the front-rear direction of the vehicle. Each chamber 6 of the chamber portion 4 and the duct portion 3 are communicated with each other through a communication hole 7 formed by intermittently partitioning the partition 5 separating them.

[0017] The configuration of the curtain airbag main body 1 is the same as that conventionally known. The curtain airbag body 1 is deployed in the downward direction of the vehicle by allowing the gas, which is also introduced into the inflation tank, to flow into the chambers 6 of the chamber part 4 through the duct part 3 extending in the front-rear direction of the vehicle. It's getting inflated!

[0018] As shown in FIG. 1, the curtain airbag body 1 is folded when the left side is the vehicle interior side (window side) and the right side is the vehicle interior side (seat side). In order to be drawn out clockwise, that is, to be drawn out toward the outside of the passenger compartment, the lower end 4a is used as a starting point and the force is directed upwards so that it is wound up counterclockwise. The duct part 3 located above the chamber part 4 is bent upward with a downward force superimposed on the winding side surface 4b of the chamber part 4 at the position on the vehicle interior side of the wound chamber part 4. It is folded into a folding part. The lower end where the duct part 3 is bent up is a crease part F which is almost the boundary between the chamber part 4 and the duct part 3. Curtain airbag body 1 is the end of winding A protruding piece 8 is formed on the duct portion 3 so as to protrude upward at an appropriate interval along the length direction thereof. The curtain airbag main body 1 is attached and fixed to the vehicle via these projecting pieces 8.

[0019] As described in the background art above, the fold portion F that folds back the duct portion 3 by folding the duct portion 3 over the winding side surface 4b of the wound chamber portion 4 is a curtain airbag. Functions as a fulcrum when the main body 1 is expanded. Due to the expansion, the part 4 of the chamber that has been wound is swung around the fold part F so as to be separated from the folded duct part 3.

[0020] With respect to the duct portion 3 along the vehicle front-rear direction, the upper end of the duct portion 3 is generally substantially linear. On the other hand, the lower end of the duct portion 3 is defined by each partition 5 formed in a convex shape or a concave shape according to the chamber shape to be set in each chamber 6 of the chamber part 4, and between these partitions 5 There is a communication hole 7 connected to each chamber 6. Therefore, the vertical dimension of the duct part 3 is not constant and cannot be determined.

Here, as shown in FIG. 3, the effective height dimension H is set so that the upper end 3c and the upper end 3c of the duct portion 3 are used as a reference. It is defined as the dimension between the maximum height position 5a of the upper edge of 5 (refer to the solid line S in Fig. 3), and external setting is performed. Or you may define as the average value (refer the continuous line T in FIG. 3) of the dimension between the said upper end 3c and the maximum height position 5a-5d of each upper end edge of the some partition 5. FIG. In other words, the effective height dimension H defines the cross-sectional area of the duct part 3 with reference to the upper end 3c of the duct part 3. Assuming the duct portion 3 where the predetermined effective height dimension H is constant along the length direction, the vertical height positions of the general duct portion 3a and the shift duct portion 3b are changed.

[0022] As shown in Fig. 2, the duct portion 3 along the longitudinal direction of the vehicle has a shift duct portion 3b in which the vertical height position relative to the curtain airbag body 1 is partially changed with respect to the general duct portion 3a. Is formed. For the sake of understanding, FIG. 8 shows a case where the duct portion 3 is formed at a certain height in the vertical direction over the entire length of the curtain airbag body 20 in the longitudinal direction of the vehicle. 2 and 8, the alternate long and short dash line indicates the fold portion F position. The solid lines indicate the positions of the upper end 3c and the lower end 3d of the general duct portion 3a. The two-dot chain line indicates the positions of the upper end 3c and the lower end 3d of the shift data portion 3b. Shift duct part 3b and general duct part The effective height H is the same for both 3a.

[0023] As can be understood by comparing FIG. 2 and FIG. 8, in the present embodiment shown in FIG. 2, the position of the duct portion 3 at the rear of the vehicle is closer than the position of the duct portion 3 at the front of the vehicle. Ascending (indicated by dimension X in the figure), the upper edge position force of the partition 5 of the chamber part 4 at the rear of the vehicle is accordingly set higher than the upper edge position of the partition 5 of the chamber part 4 at the front of the vehicle. Yes.

In the example schematically shown in FIG. 4, the duct portion 3 has a certain predetermined effective height dimension H along the length direction, and the height position is in front of the vehicle (left side). On the other hand, it has been partially changed so that the rear (right side) of the vehicle is higher. In the example shown in FIG. 5, the height is changed partially so that the vertical position of the duct portion 3 in the central portion of the vehicle is higher than the front and rear portions of the vehicle. In these drawings, as indicated by a two-dot chain line Y, the height change that does not maintain the predetermined effective height dimension H is not included. FIG. 2 corresponds to FIG. 4, and the duct portion 3 is set with a predetermined effective height dimension H over the entire length in the vehicle front-rear direction, and the vertical height position relative to the curtain airbag body 1 is the dimension X between the front and rear of the vehicle. Has only been changed upwards.

[0025] Regarding the boundary between the shift duct portion 3b and the general duct portion 3a, as shown in Fig. 7, the shift duct portion 3b rises at a steep angle with respect to the general duct portion 3a, and the falling force ¾ step Even if the vertical height position is changed via the part 9, the vertical height position is changed via the inclined part 10 rising and falling at a gentle angle as shown in FIG. Any of these may be used. Further, since the shift duct portion 3b controls the deployment process of the curtain airbag body 1, it is preferably set with respect to the seating position of the occupant.

[0026] The operation of the curtain air bag for a vehicle that works on the present embodiment will be described. The distance between the occupant's position and the position of the curtain airbag body 1 where it is installed. The distance between the installation position of the curtain airbag body 1 and the opening distance due to the relationship between the opening to be installed and the installation position of the curtain airbag body 1 Example of the case where the front seat side is close but the rear seat side is far I will explain to you. In such a case, on the front seat, deploy the curtain airbag body 1 as it is. If it is done, its deployment power may be small. In the rear seat, in order to avoid interference with the occupant, it is preferable that the rear seat be expanded and expanded slightly toward the outside of the vehicle rather than directly below, and the deployment force should be larger.

[0027] When the curtain airbag main body 1 is mounted in such a mounted state, the curtain airbag main body 1 has a general outer part 3a 1S rear seat in front of the vehicle where the front seat is installed (left side in the figure). A shift duct portion 3b is arranged behind the vehicle to be installed (right side in the figure) and attached to the vehicle. In other words, in this example, the shift duct portion 3b is arranged at a position outside the vehicle below just below and where a large deployment force is required.

[0028] The gas from the inflator flows into the duct part 3 of the curtain airbag main body 1 through the gas inlet 2 and spreads over the entire duct part 3, and further from the duct part 3 to the chamber part 4 And inflow. In the present embodiment, the curtain air nog body 1 is overlapped with the winding side surface 4b of the wound chamber part 4 and the duct part 3 is folded back as a folded part to be in a folded state. Yes. The gas flowing into the duct part 3 causes the duct part 3 to expand. As a result, the chamber portion 4 of the curtain airbag body 1 is deployed downward and inflated with the fold portion F as a fulcrum.

[0029] Table 1 shows the result of an experiment conducted on the structure of the general curtain airbag body 20 shown in FIG.

[0030] [Table 1]

In Table 1, Z indicates the size of the fold (see Fig. 1), and the experiment was conducted with various changes in the size of the fold. Based on the case where it is set to 40 mm, the curtain airbag body 20 can be deployed directly below the front seat if the folding part is at least 45 mm in size. On the other hand, if the rear seat is not at least 55 mm, the curtain airbag body 20 could not be surely deployed directly below. In the front seat, when it becomes 55mm, which is deployed right under the rear seat, it will be deployed outwardly from the car body. In the rear seat, when it reaches 57.5 mm, it starts to expand outward. In this case, of course, the front seat expands outward.

[0032] This relates to the unfolding behavior of the chamber part 4 with the fold part F as a fulcrum, and when the fold part size is small, the duct part 3 is slowly fed out due to a relatively moderate increase in internal pressure. As a result, the chamber part 4 expands with a direct downward force, and the deployment force at that time is small. On the other hand, if the size of the folding part is large, the internal pressure of the duct part 3 increases relatively rapidly, and the fulcrum As a result, the chamber part 4 is pushed sideways at a stroke from the position F of the crease that becomes, so that a pressing force is applied to the chamber part 4 toward the outside of the vehicle body while expanding downward. It is estimated that chamber part 4 expands with downward force while moving outward from the vehicle body, and the expansion force at that time is also strong and large.

In the present embodiment, the shift duct portion 3b is formed in order to increase the size of the folding portion based on the experimental result. According to the example of FIG. 2, the dimension Z of the folding part can be increased by the dimension X which is the amount to be pushed up. The shift duct portion 3b is set, for example, at the rear of the vehicle body on which a rear seat that is a seating position for a passenger is provided. From the above experimental results, it is possible to deploy and inflate the curtain airbag body 1 with a large deploying force toward the outside of the vehicle body in the shift duct portion 3b as compared with the general duct portion 3a.

[0034] For example, if the dimension Z of the folding part is set to 45 mm, and the dimension X of 10 mm or more is set to the rear seat side, the height position of the folding part F will be the length direction of the curtain airbag body 1 (horizontal (Z + X) of the rear seat side fold part is 55mm or more, and the optimum deployment behavior can be obtained by adjusting the dimension X, which is the push-up amount. You can see that In other words, the curtain airbag body 1 can be appropriately deployed and inflated at the rear seat position where it is preferable to push the curtain airbag body 1 outward with a strong deployment force in relation to the mounting position of the curtain airbag body 1.

[0035] In the present embodiment, such a favorable deployment operation simply pushes the curtain airbag body 1 upward from below without requiring any complicated assembly operation. There is an advantage that it can be secured only by winding and handling. Thus, in the curtain airbag for a vehicle according to the present embodiment, the curtain airbag body 1 is mounted on the vehicle and the relationship between the deployment and inflation performance required for the curtain airbag body 1 is determined. Force The single airbag body 1 can be deployed and inflated with an appropriate deployment force in an appropriate deployment direction.

In the above description, the case where the shift duct portion 3b is set to the rear of the vehicle has been described as an example. However, if the shift duct portion 3b is set in accordance with the position where the deployment direction of the curtain airbag body 1 is desired to be controlled. Of course it is good. The shift duct portion 3b only needs to be continuously formed with respect to the general data portion 3a. The connection form of the shift duct portion 3b and the general data portion 3a is shifted between the step portion 9 and the inclined portion 10. Of course, this is true.

Brief Description of Drawings

FIG. 1 is a front sectional view of a folded state of a curtain airbag main body showing a preferred embodiment of a vehicle curtain airbag according to the present invention.

2 is a side view showing a deployed state of the curtain airbag main body shown in FIG.

FIG. 3 is an enlarged view of the main part of FIG. 2 for explaining a predetermined effective height dimension H of the duct part.

FIG. 4 is a schematic view of the deployed state of the curtain airbag body shown in FIG.

FIG. 5 is a schematic view showing a modification of the curtain airbag body shown in FIG.

FIG. 6 is an enlarged schematic view of the main part of the curtain airbag main body shown in FIG.

FIG. 7 is an enlarged schematic view of a main part showing a modification of the curtain airbag body shown in FIG.

FIG. 8 is a side view showing a deployed state of a general curtain airbag body for comparison with FIG.

Explanation of symbols

[0038] 1 Curtain airbag body

2 Gas inlet

3 Duct section

3a General duct part

3b Shift duct part Part of chamber

a Lower end of part of chamber b Scraped side face of part of chamber Stepped part

0 Inclined part

Predetermined effective height dimension

Claims

The scope of the claims

[1] A duct portion formed at the upper part of the curtain airbag main body, having a predetermined effective height dimension along the length direction thereof, and for introducing gas from the gas inlet,

A curtain wall that is formed at the bottom of the curtain airbag body and into which gas is introduced from the duct portion;

A curtain air bag for a vehicle according to claim 1, wherein the duct portion is formed with a shift duct portion in which a vertical height position with respect to the curtain airbag body is partially changed with respect to the general duct portion.

2. The vehicle curtain airbag according to claim 1, wherein the shift duct portion of the duct portion is set at a seating position of an occupant.

[3] The vehicle according to claim 1 or 2, wherein the shift duct portion of the duct portion is changed in a vertical height position through a step portion with respect to the general duct portion. Curtain airbag.

[4] The vehicle according to claim 1 or 2, wherein the vertical position of the shift duct portion of the duct portion is changed with respect to the general duct portion via an inclined portion. Curtain airbag.

[5] In the curtain airbag body, a part of the chamber is wound upward starting from the lower end thereof, and the duct part is folded over the wound side surface of the wound part of the chamber. The curtain airbag for a vehicle according to any one of claims 1 to 4, wherein the curtain airbag is in a folded state.