JPH10315896A - Head protection side airbag device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent breakage and misalignment of a base cloth when an airbag bag is deployed. SOLUTION: An inflator 14 of an airbag bag body 16 is provided.
A mounting hole 3 for mounting the front pillar
Along the line 5, a shock absorbing portion 38 for absorbing a shock when the airbag bag is deployed is formed. This shock absorbing part 38
Outside of the suture portion 42 of the base cloth 17 with the suture 19,
Breaking thread 44 that breaks upon deployment of airbag bag 16
When the airbag bag is deployed, the breaking thread 44 breaks, thereby reducing the impact load acting on the sewing portion 42 of the base cloth 17 due to gas pressure. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of injecting gas from an inflator when a predetermined high load is applied to a side of a vehicle body, and using the gas to form a curtain of an airbag bag from a pillar portion along a roof side rail portion. The present invention relates to a head protection side airbag device to be inflated.

[0002]

2. Description of the Related Art In order to improve the protection performance of an occupant's head when a predetermined high load is applied to a side portion of a vehicle body, an airbag bag stored in a folded state over a front pillar portion and a roof side rail portion. Occupant protection devices have already been proposed in which the body is inflated in a curtain along the window glass. Hereinafter, WO9 which discloses this type of occupant protection device is disclosed.
The configuration disclosed in Japanese Patent Application Laid-Open No. 6/26087 will be described.

As shown in FIG. 14, this occupant protection device 100 is a long duct 10 which extends from a front pillar portion 102 to a roof side rail portion 104.
6, an airbag bag 112 stored in a folded state in the duct 106 and fixed to the vehicle body at a front end fixing point 108 and a rear end fixing point 110, and a hose 114
The inflator 116 is connected to the rear end of the duct 106 through the airbag, and blows out gas when a predetermined high load is applied to the side of the vehicle body, and one end is fixed to the vehicle body and the other end is an airbag bag. A belt-shaped strap 118 fixed to the rear end of the body 112 is constituted as a main component. Further, the airbag bag body 112 is formed by connecting a plurality of cells 120 each formed in a substantially cylindrical shape and arranged with the longitudinal direction substantially in the vehicle vertical direction.

According to the above configuration, when a predetermined high load is applied to the side of the vehicle body, gas is ejected from the inflator 116. Therefore, the ejected gas is supplied to the hose 114.
Then, the air flows into each cell 120 of the folded airbag bag 112 via the duct 106. As a result, each cell 120 expands in a substantially cylindrical shape with the longitudinal direction substantially in the vehicle vertical direction, whereby the airbag bag body 112 expands in a curtain shape along the window glass 122. Further, the rear end of the airbag bag body 112 has a strap 118.
, The rear end side of the airbag bag body 112 is surely arranged inside the upper part of the center pillar portion 124.

[0005]

However, in the head protection side airbag device as described above, the airbag bag, which is stored in a small folded state, is instantaneously deployed. The internal pressure of the bag increases instantaneously. In particular, since the internal pressure becomes extremely high in a portion near the inflator, a large impact load is likely to act on the joint portion of the base fabric forming the airbag bag body, and the base portion starts from the joint portion of the base fabric. It is conceivable that the cloth is torn or misaligned.

In view of the above, an object of the present invention is to provide a head protection side airbag device that can prevent the base cloth from being broken or misaligned when the airbag bag is deployed.

[0007]

According to the first aspect of the present invention, the base fabric is connected in a bag shape, and front and rear ends are fixed to the front and rear sides of the vehicle, respectively, and the front and rear fixing points are connected. A curtain-shaped airbag body having a plurality of substantially parallel cylindrical inflatable portions crossing a tension line is stored straddling a pillar and a roof side rail, and is disposed below a belt line of the pillar at the time of a side collision. A head protection side airbag device that inflates and deploys between an occupant's head and a vehicle side portion by operating the airbag device, wherein a portion of the airbag bag body adjacent to the inflator, along the pillar mounting portion. And a shock absorbing portion for absorbing a shock when the airbag bag is deployed.

Therefore, when an impact load is applied by gas pressure to a portion of the airbag bag close to the inflator in the initial stage of the deployment of the airbag, the impact provided along the pillar mounting portion at the portion close to the inflator is increased. The absorbing portion absorbs a part of the impact load acting on the airbag body. As a result, the impact load acting on the joint portion of the base fabric is reduced, and the breakage and misalignment of the base fabric can be prevented.

According to a second aspect of the present invention, in the head protection side airbag device according to the first aspect, the impact absorbing portion is broken by the expansion of the airbag bag outside the joint portion of the base cloth. It is a folded portion which is stitched by a breaking thread to be formed.

Therefore, when an impact load is applied by gas pressure to the portion of the airbag bag close to the inflator in the initial stage of the deployment of the airbag, the folded portion provided along the pillar mounting portion at the portion close to the inflator. The broken yarn at the portion is broken, and a part of the impact load is absorbed. As a result,
The impact load acting on the joint portion of the base fabric is reduced, and the breakage and misalignment of the base fabric can be prevented. Further, by changing the strength and the number of broken yarns, the shock absorbing capacity of the shock absorbing portion can be easily adjusted.

According to a third aspect of the present invention, in the head protection side airbag device according to the second aspect, the folded portion is a portion for attaching the airbag body to the inflator-side end and the upper end of the pillar. Are set to the inflator side from the vicinity of the center of the inflator.

[0012] Therefore, in the upper part of the pillar which may come into contact with the occupant's head, since the folded part is not set, this part can be surely covered by the deployed airbag bag.

According to a fourth aspect of the present invention, a plurality of base cloths are connected in a bag shape and front and rear ends are respectively fixed to the front and rear sides of the vehicle, and a plurality of tension lines crossing a tension line connecting the front and rear fixing points. A curtain-shaped airbag body having a substantially parallel cylindrical inflatable portion is stored straddling the pillar and the roof side rail, and operates an inflator disposed below the belt line of the pillar when a side collision occurs. A head protection side airbag device that expands and deploys between an occupant's head and a vehicle side by supplying gas to the cylindrical inflatable portion, wherein the cylindrical airbag device is provided with a cylindrical inflatable member. At least one of the inside and the inside is provided with stress relaxation means which breaks when the airbag body is deployed, adjacent to the joint portion of the base cloth.

Therefore, immediately before the airbag bag is completely deployed, the stress relieving means is broken, and a part of the impact load acting on the joint portion of the base fabric due to the gas pressure is absorbed. As a result, the impact load acting on the joint portion of the base fabric is reduced, and the breakage and misalignment of the base fabric can be prevented.

According to a fifth aspect of the present invention, in the head protection side airbag device according to the fourth aspect, the airbag bag is made of a single base cloth.

Accordingly, compared with the case where the airbag bag is formed of two base cloths, the number of joints of the base cloths is reduced, so that the number of parts for disposing the stress relaxation means can be reduced, and the productivity is improved.

According to a sixth aspect of the present invention, a plurality of base cloths are connected in a bag shape and front and rear ends thereof are fixed to the front and rear sides of the vehicle, respectively, and a plurality of tension lines crossing a tension line connecting the front and rear fixing points. A curtain-shaped airbag body having a substantially parallel cylindrical inflatable portion is stored straddling a pillar and a roof side rail, and upon a side collision, an inflator arranged below a belt line of the pillar is operated to activate an occupant's head. A head protection side airbag device that is inflated and deployed between a portion and a vehicle side portion, comprising an auxiliary cloth disposed in a portion of the airbag body close to the inflator, wherein the auxiliary cloth is The auxiliary gas supply path is formed by a connecting means which breaks when the airbag body is deployed adjacent to the connecting portion of the base cloth. Gas supply formed Is characterized in that the is smaller than the cross-sectional circumference.

Therefore, when the airbag bag is deployed, the folded and stored airbag bag is deployed from the inflator side. At this time, the cross-sectional circumferential length of the auxiliary gas supply path formed by the auxiliary cloth disposed at a position adjacent to the inflator in the airbag bag body corresponds to the cross-sectional circumference of the gas supply path formed by the base cloth on the outer peripheral portion. Since the length is set to be smaller than the length, the impact load first acts on the connecting means of the auxiliary cloth, the connecting means is broken, and a part of the impact load is absorbed. As a result,
The impact load acting on the joint portion of the base fabric is reduced, and the breakage and misalignment of the base fabric can be prevented. Further, by providing the auxiliary cloth, the airbag body can be reinforced and the sealing property is improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A head protection side airbag device according to a first embodiment of the present invention will be described with reference to FIGS.

In the drawings, an arrow FR indicates a vehicle forward direction, an arrow UP indicates a vehicle upward direction, and an arrow IN indicates a vehicle width inside direction.

As shown in FIG. 3, a head protection side airbag device 10 according to the first embodiment has a sensor 12 for detecting a side collision state, and a column-shaped inflator for ejecting gas when activated. 14 and an airbag bag body 16 folded in a predetermined folding manner as main components. The sensor 12 has a center pillar (B
It is arranged near the lower end of the pillar 18 and detects a side collision state when a side collision load of a predetermined value or more acts on the vehicle body side.

The inflator 14 is disposed near the connection between the front pillar (A pillar) 20 and the instrument panel 22 and is connected to the sensor 12 described above. Therefore, when the sensor 12 detects the side collision state, the inflator 14 is operated.

As shown in FIG. 1, the air bag 16
Has a single base cloth 17 folded in two at the lower end, and the vicinity of the overlapped peripheral portion 17A and the rear portion 17B are connected to the suture 1
9 is formed by sewing.

As shown in FIG. 3, the air bag 16
Are formed in a substantially parallelogram shape. Further, at the middle part in the vertical direction in the side view of the airbag body 16, the tension line T connecting the front end fixed point and the rear end fixed point of the airbag body 16 is crossed, and the vertical direction of the airbag body is defined as the longitudinal direction. A plurality of non-inflating portions 24 are formed at predetermined intervals, and these non-inflating portions 24 form a plurality of substantially parallel cylindrical inflating portions that cross the tension line T when the airbag body is deployed. It has become.

As shown in FIG. 1, the air bag 16
Is formed by sewing with a suture thread 25.

As shown in FIG. 2, the air bag 16
Is folded in a predetermined folding manner to be elongated, and is housed over the front pillar garnish 26 and the roof lining or the roof side rail garnish (not shown). The folded airbag body 16 may be housed in a case (not shown) over the front pillar garnish 26 and the roof lining or the roof side rail garnish.

As shown in FIG. 4, the air bag 16
Is arranged at an inflator arrangement position so that gas ejected from the inflator 14 flows thereinto,
The intermediate portion 16B is arranged along the front pillar 20 and the roof side rail 28, and the rear end portion 16C is arranged near a quarter pillar (C pillar) 30.

As shown in FIG. 2, the front pillar 20
Is formed in a closed cross-sectional structure by a pillar outer panel 32 having a hat-shaped cross section disposed outside the vehicle compartment and a pillar inner panel 34 having a substantially flat shape disposed inside the vehicle compartment. The front of the bag bag body 16 is attached. Specifically, the mounting hole 33 formed in the pillar inner panel 34 and the airbag bag 16
A bolt 36 inserted through a mounting hole 35 formed in the upper edge of the bolt 36, and a weld nut 37 screwed into the bolt 36
Thereby, the front part of the airbag bag body 16 is fixed to the pillar inner panel 34. Similarly, the upper edge of the airbag bag 16 is also attached to the inner panel of the roof side rail 28.

As shown in FIG. 1, the air bag 16
A shock absorbing portion 38 for absorbing a shock when the airbag body is deployed is formed along a mounting hole 35 for mounting the front pillar at a portion adjacent to the inflator 14.

As shown in FIG. 2, this shock absorbing portion 38
The airbag 1 is located outside the seam 42 of the base cloth 17.
6 is formed by a folded portion 46 sewn with a breaking thread 44 that breaks when the 6 is unfolded.

Next, the operation of the first embodiment will be described.
In the head protection side airbag device of the first embodiment,
When an impact load is applied by gas pressure to a portion of the airbag bag body 16 adjacent to the inflator 14 in the initial stage of the deployment of the airbag bag body, shock absorption provided along the front pillar mounting portion at the portion of the airbag bag body 16 near the inflator 14 is achieved. The breaking thread 44 of the folded portion 46 as the portion 38 is broken, and a part of the impact is absorbed.

As a result, as shown in FIG.
4 is broken (TL), the rise of the impact F acting on the joint portion of the base fabric 17 is suppressed, so that the maximum value F1 of the impact load (tensile load) F acting on the joint portion of the base fabric 17
However, it is smaller than the maximum value S1 of the impact load S acting on the joint portion of the base fabric of the airbag body which does not have the folded portion 46 sewn with the breaking thread 44 as shown by the broken line in FIG.

For this reason, in the first embodiment, the base cloth 17
The impact acting on the joints of the base cloth 17 is reduced, and the base cloth 17 can be prevented from being torn or misaligned. Therefore, the internal pressure holding time of the airbag bag body 16 can be extended. In addition, the breaking yarn 4
By changing the strength and the number of pieces 4, the shock absorbing capacity of the shock absorbing section 38 can be easily adjusted.

In the first embodiment, the folded portion 46 sewn by the breaking thread 44 that is broken by deployment is formed in the entire area along the attachment portion to the front pillar 20 in the airbag bag 16. Instead of this, as shown in FIG. 6, the folded portion 46 sewn with the breaking thread 44 is attached near the center between the front end 16D of the airbag bag body 16 on the inflator 14 side and the mounting portion 16E to the upper end of the front pillar. It may be set only in the region L closer to the inflator 14. In this case, since the folded portion 46 is not set in the airbag body 16 above the front pillar which may come into contact with the occupant's head, the airbag bag body in which this portion is deployed is not provided. The cover 16 can be securely covered.

In the first embodiment, the shock absorbing section 3
8 is composed of a folded portion 46 sewn with a breaking thread 44 that breaks when the airbag bag 16 is deployed,
The shock absorbing portion 38 is not limited to this, and the airbag 1
6 may be composed of folded portions joined by an adhesive that is broken by the expansion. Also, the shape of the folded part is shown in FIG.
It is not limited to the shape.

Further, as shown in FIG.
8 may be constituted by a mounting hole 47 formed in the upper edge of the airbag bag 16. More specifically, the mounting hole 47 is composed of a large-diameter portion 47A through which the bolt 36 penetrates, and an elongated small-diameter portion 47B formed continuously with the large-diameter portion 47A. Bag bag body 16 is bolt 3
7 in the direction of arrow A in FIG. 7 and when the position indicated by the two-dot chain line is reached, the small diameter portion 4 of the mounting hole 47 is
The configuration may be such that the impact is absorbed by the 7B being expanded and the impact acting on the joint portion of the base fabric is reduced. In FIG. 7, for easy understanding, the bolt 3
6 is shown in a state where it is moved in the opposite direction.

Next, a second embodiment of the head protection side airbag device of the present invention will be described with reference to FIGS.

The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIGS. 8 and 9, in the second embodiment, the airbag body 50 is formed by folding one base cloth 52 at the lower end into two parts. Of the front pillars 20 by sewing.
And a passage portion 50A extending along the roof side rail 28, and a plurality of substantially parallel cylindrical expansion portions 50B extending downward from the passage portion 50A and crossing a tension line connecting the front and rear fixing points. . Therefore, the gas from the inflator 14 is supplied to each cylindrical inflatable portion 50B through the passage portion 50A, and the airbag body 50 is inflated and deployed between the occupant head and the vehicle side portion. ing.

As shown in FIG. 9 (A), in the passage portion 50A of the airbag body 50, adjacent to the connecting portion 54 of the base cloth 52, there is provided a means for stress relaxation which breaks when the airbag body is deployed. The base cloths 52 facing each other are connected by a breaking thread 56 having a predetermined length. As shown in FIG. 9B, immediately before the airbag body 50 is completely deployed, tension is applied to the breaking thread 56. As a result, as shown in FIG. 9C, the breaking yarn 56 is broken. Note that a predetermined length of the breaking thread 56 as a stress relieving means that breaks when the airbag body is deployed adjacent to the joint part 54 of the base cloth 52 also in the cylindrical inflatable part 50B of the airbag body 50. The opposing base cloths 52 are connected.

Next, the operation of the second embodiment will be described.
In the second embodiment, the gas from the inflator 14 is
As shown in FIG. 9B, when the airbag body 50 is supplied to each cylindrical inflatable portion 50B through the passage portion 50A and inflates and deploys between the occupant head and the vehicle side portion. Immediately before the airbag body 50 is completely deployed, tension is applied to the broken yarn 56, and as shown in FIG.
Breaks.

As a result, as shown in FIG.
The impact load (tension) P acting on the broken yarn 56 reaches the fracture impact load value F2 and the broken yarn 56 breaks. However, the impact load acting on the joint portion 54 of the base fabric 52 due to the fracture of the broken yarn 56 Part of the airbag bag 50 is absorbed.
Is fully developed, the maximum value F1 of the impact load F acting on the joint 54 of the base cloth 52 can be suppressed to be lower than the breaking impact load value F2 of the joint 54 of the base cloth 52. Therefore, it is possible to prevent the base cloth 52 from being torn or misaligned.

The broken line in FIG. 10 indicates the impact load S acting on the joint 54 of the base cloth 52 when the joint by the broken yarn 56 is not performed.

Further, in the second embodiment, since the airbag bag body 50 is made of one base cloth 52, the connection of the base cloth 52 is made as compared with the case where the airbag bag body is made of two base cloths. The number of parts 54 is reduced. As a result, the number of locations where the broken yarns 56 are provided can be reduced, and the productivity is improved. Further, in the second embodiment, the airbag bag body 50 is formed by folding one base cloth 52 at the lower end and joining the peripheral portions by stitching or bonding. The present invention is also applicable to a so-called knitted bag formed by knitting.

Next, a third embodiment of the head protection side airbag device of the present invention will be described with reference to FIGS.

The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 11, in the third embodiment, an auxiliary cloth 60 is provided in a portion of the airbag body 16 adjacent to the inflator 14.

As shown in FIG. 12, the auxiliary cloth 60 is folded in two at the lower end and sewn together with the base cloth 17 with the suture 19. Further, the auxiliary cloth 60 is connected to the connecting portion 54 of the base cloth 17.
Adjacent to the auxiliary gas supply path 62 by a rupture thread 61 as rupture coupling means that ruptures when the airbag body is deployed.
63 are formed. The auxiliary gas supply paths 62 and 63
Are the cross-sectional circumferences L1 and L2 of the gas supply passages 64 and 65 formed by the base cloth 17 formed on the outer peripheral portion thereof.
3, it is set smaller than L4.

Next, the operation of the third embodiment will be described.
In the third embodiment, when the airbag bag is deployed, the folded and stored airbag bag 16 is deployed from the inflator side. At this time, the cross-sectional circumferential lengths L1 and L of the auxiliary gas supply paths 62 and 63 formed by the auxiliary cloth 60 disposed at a position close to the inflator 14 in the airbag bag 16.
2 is set smaller than the cross-sectional circumferential lengths L3 and L4 of the gas supply passages 64 and 65 formed on the outer periphery thereof, so that the impact load due to the gas pressure first acts on the joint of the auxiliary cloth 60 with the broken yarn 61. The broken yarn 61 breaks and a part of the impact load is absorbed.

As a result, as shown in FIG. 13, the impact load applied to the joint of the auxiliary cloth 60 by the broken yarn 61 is:
At time T1, the breaking yarn 61 reaches the maximum value (breaking value) and breaks. The breaking of the breaking yarn 61 absorbs a part of the impact load acting on the joint 54 of the base cloth 17. Therefore, by the time the deployment of the airbag bag 16 is completed (T2), the maximum value of the impact load F acting on the joint 54 of the base cloth 17 is as follows:
13 is smaller than the maximum value S1 of the impact load S acting on the joint portion of the base cloth of the airbag body not having the configuration of the third embodiment, which is indicated by a broken line in FIG.

Therefore, in the third embodiment, the base cloth 17
Of the base cloth 17 can be prevented, and the misalignment can be prevented. The auxiliary cloth 6
By providing 0, the airbag body 16 can be reinforced and the sealing performance can be improved.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to such an embodiment, and various other embodiments are included within the scope of the present invention. It is clear to a person skilled in the art that is possible. For example, the airbag bag body may be formed by bonding the periphery of two base cloths by bonding, sewing, or the like, and the shape is not limited to a substantially parallelogram shape. Further, the airbag body may be extended rearward to protect the heads of the occupants seated in the front and rear seats. Furthermore, the airbag bag body is stored straddling the quarter pillar (C pillar) and the roof side rail, and the inflator is disposed below the quarter pillar belt line. Is also applicable.

[0053]

According to the first aspect of the present invention, a plurality of base cloths are connected in a bag shape and front and rear ends thereof are fixed to the front and rear sides of the vehicle, respectively, and cross a tension line connecting the front and rear fixing points. A curtain-shaped airbag body having a substantially parallel cylindrical inflatable portion is stored straddling a pillar and a roof side rail, and an inflator disposed below a pillar line of a pillar is actuated at the time of a side collision to activate an occupant's head. A head protection side airbag device that expands and deploys between a part and a vehicle side part,
A shock absorbing portion that absorbs an impact load during deployment of the air bag body is provided along a pillar mounting portion in a portion of the air bag body close to the inflator, so that the base fabric is broken when the air bag body is deployed. It has an excellent effect that misalignment can be prevented.

According to a second aspect of the present invention, there is provided the head protection side airbag device according to the first aspect, wherein the shock absorbing portion is broken outside the joint portion of the base fabric by the deployment of the airbag bag. Since the folded portion is sewn with a thread, it has an excellent effect that the shock absorbing capacity of the shock absorbing portion can be easily adjusted in addition to the effect of the first aspect.

According to a third aspect of the present invention, in the head protection side airbag device according to the second aspect, the folded portion is located near a center between an end portion of the airbag body on the inflator side and an attachment portion to the upper end of the pillar. Since it is set to the inflator side, in addition to the effect of claim 2, it is excellent that the upper part of the pillar which may come into contact with the occupant's head can be reliably covered by the expanded airbag bag. Has the effect.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a vehicle comprising a plurality of base cloths joined in a bag shape, the front and rear ends of which are fixed to the front and rear sides of the vehicle, respectively, and crossing a tension line connecting the front and rear fixing points. A curtain-shaped airbag bag having a parallel cylindrical inflatable portion is stored straddling the pillar and the roof side rail, and when a side collision occurs, an inflator arranged below the pillar line of the pillar is actuated, and the gas is transferred to the cylinder. A head protection side airbag device that expands and deploys between an occupant's head and a vehicle side portion by supplying the airbag device to an airbag inflator, wherein at least one of a passage portion of the airbag body and a cylindrical inflator portion. In addition, since the stress relaxation means that breaks when the airbag body is deployed is provided adjacent to the joint portion of the base cloth, the excellent effect that the base cloth can be prevented from being broken or misaligned when the airbag body is deployed. Having

According to a fifth aspect of the present invention, in the head protection side airbag device according to the fourth aspect, the airbag bag is formed of a single base cloth. There is an excellent effect that the number of parts for disposing the stress relieving means can be reduced and the productivity is improved.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a vehicle comprising a plurality of base cloths joined in a bag shape, the front and rear ends of which are fixed to the front and rear sides of the vehicle side, respectively, and crossing a tension line connecting the front and rear fixing points. A curtain-shaped airbag body having a parallel cylindrical inflatable portion is stored straddling the pillar and the roof side rail, and operates the inflator disposed below the pillar line of the pillar at the time of a side collision, thereby occupying the occupant's head. What is claimed is: 1. A head protection side airbag device inflating and deploying between a side of a vehicle and an auxiliary cloth disposed in a portion of an airbag body adjacent to an inflator, wherein a base cloth is connected to the auxiliary cloth. The auxiliary gas supply path is formed by a connecting means that is broken adjacent to the portion when the airbag bag is deployed, and the peripheral length of the cross section of the auxiliary gas supply path is equal to that of the gas supply path formed by the base cloth on the outer periphery. Smaller than cross-sectional circumference Because it is constant, it has an excellent effect that it is possible to prevent breakage of the base fabric when the air bag body deploying, the misalignment. In addition, there is an excellent effect that the airbag body can be reinforced and the sealing property is improved.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an airbag bag of a head protection side airbag device according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is a schematic configuration diagram illustrating a state where an airbag body is inflated in the head protection side airbag device according to the first embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing an arrangement portion of the head protection side airbag device according to the first embodiment of the present invention when viewed from a side.

FIG. 5 is a graph showing the relationship between the airbag deployment time and the impact load acting on the joint of the base fabric in the head protection side airbag device according to the first embodiment of the present invention.

FIG. 6 is a schematic side view showing an airbag body of a head protection side airbag device according to a modification of the first embodiment of the present invention.

FIG. 7 is an enlarged side view showing a partial cross section of an impact absorbing portion of a head protection side airbag device according to a modification of the first embodiment of the present invention.

FIG. 8 is a schematic configuration diagram showing an arrangement portion of a head protection side airbag device according to a second embodiment of the present invention as viewed from a side.

9 (A) to 9 (C) are operation explanatory views showing each deployed state of the airbag body in a cross section along line 9-9 in FIG. 8;

FIG. 10 is a graph showing a relationship between an airbag deployment time and an impact load acting on a joint portion of a base fabric in the head protection side airbag device according to the second embodiment of the present invention.

FIG. 11 is a schematic side view showing an airbag bag of a head protection side airbag device according to a third embodiment of the present invention.

FIG. 12 is an enlarged cross-sectional view showing an initial state of deployment of the airbag body along a line 12-12 in FIG. 11;

FIG. 13 is a graph showing the relationship between the airbag deployment time and the impact load acting on the joint of the base fabric in the head protection side airbag device according to the third embodiment of the present invention.

FIG. 14 is a schematic side view showing a head protection side airbag device according to a conventional embodiment.

[Explanation of symbols]

 Reference Signs List 10 head protection side airbag device 14 inflator 16 airbag bag body 17 base cloth 18 center pillar 20 front pillar 22 instrument panel 24 non-inflating section 28 roof side rail 38 shock absorbing section 42 sewing section of base cloth 44 breaking thread 46 Folded portion 47 Mounting hole 50 Airbag bag body 50A Passage portion 50B Cylindrical inflatable portion 52 Base cloth 54 Connection portion of base cloth 56 Breaking thread (stress relieving means) 60 Auxiliary cloth 61 Breaking thread (breaking combining means) 62 Auxiliary gas supply Road 63 Auxiliary gas supply path 64 Gas supply path 65 Gas supply path

Continued on the front page (72) Inventor Etsuhisa Mimura 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Shuji Yamada 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Invention Person Toshinori Tanase 1 Ochiai Nagahata, Kasuga-machi, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. Yasuo 1 Aichi Ochiai Nagahata, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd.

Claims (6)

[Claims] 1. A plurality of substantially parallel cylindrical inflatable portions which are joined to a base fabric in a bag shape and whose front and rear ends are respectively fixed to the front and rear sides of a vehicle side portion, and cross a tension line connecting the front and rear fixing points. A curtain-shaped airbag body having a pillar is stored astride the pillar and the roof side rail, and at the time of a side collision, an inflator disposed below a belt line of the pillar is actuated so that the occupant's head and the side of the vehicle are moved. A head protection side airbag device that inflates and deploys between the airbag bag, and absorbs an impact at the time of deploying the airbag bag at a portion of the airbag that is close to the inflator, along the pillar attachment portion. A head protection side airbag device provided with a shock absorbing portion. 2. The impact absorbing section according to claim 1, wherein the impact absorbing section is a folded section sewn by a breaking thread that is broken by deployment of the airbag bag outside the joining section of the base cloth. Head protection side airbag device. 3. The inflator according to claim 2, wherein the folded portion is set closer to the inflator side than near the center of an end portion of the airbag bag on the inflator side and a portion attached to an upper end of the pillar. The head protection side airbag device as described in the above. 4. A plurality of substantially parallel cylindrical inflatable portions which are joined to the base fabric in a bag shape and whose front and rear ends are fixed to the front and rear sides of the vehicle side, respectively, and which cross a tension line connecting the front and rear fixing points. Is stored over the pillar and the roof side rail, and when a side collision occurs, an inflator disposed below the belt line of the pillar is operated to cause the gas to flow into the cylindrical inflatable portion. By supplying to
A head protection side airbag device that inflates and deploys between an occupant head and a vehicle side portion, wherein a joining portion of the base fabric is provided in at least one of a passage portion of the airbag body and a cylindrical inflatable portion. A head protection side airbag device, wherein a stress relaxation means that breaks when the airbag bag is deployed is provided adjacent to the airbag. 5. The head protection side airbag device according to claim 4, wherein the airbag body is made of one base cloth. 6. A plurality of substantially parallel cylindrical inflatable portions which are joined to the base fabric in a bag shape and whose front and rear ends are fixed to the front and rear sides of the vehicle side, respectively, and which cross a tension line connecting the front and rear fixing points. A curtain-shaped airbag body having a pillar is stored astride the pillar and the roof side rail, and at the time of a side collision, an inflator disposed below a belt line of the pillar is actuated so that the occupant's head and the side of the vehicle are moved. A head protection side airbag device that inflates and deploys between the airbag device, further comprising an auxiliary cloth disposed in a portion of the airbag body adjacent to the inflator, wherein the auxiliary cloth includes a joining portion of the base cloth. Auxiliary gas supply path is formed by coupling means that breaks when the airbag bag is deployed adjacent to the airbag body, and the auxiliary gas supply path has a cross-sectional circumferential length of the gas supply path formed by the base cloth on the outer periphery thereof. Smaller than cross-sectional circumference Head protection side air bag device characterized by being a constant.