JP4201560B2 - Airbag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air bag for a vehicle body window that can be inflated and deployed at the time of a vehicle collision or the like to reliably and effectively protect an occupant.
[0002]
[Prior art]
In recent years, various airbag devices have been widely used to ensure the safety of passengers. For example, in automobiles, it is becoming common to install airbag devices not only in the center of the steering wheel in front of the driver but also in the vicinity of the passenger seat and rear seat as standard equipment. The site has also increased significantly.
[0003]
As an example of this type of airbag, an airbag that is folded and accommodated in a bellows shape so as to be inflatable and deployable from a vehicle pillar to a roof side rail is disclosed in, for example, Japanese Patent Application Laid-Open No. 11-235965. Yes. The airbag disclosed in this publication has an inflating portion for the front seat and the rear seat extending downward in a partial region of a cylindrical gas introduction passage that is long in the longitudinal direction of the vehicle body, and between the inflating portions. It is connected via a non-inflatable part.
[0004]
The upper edge of the airbag is attached from the front pillar along the roof side rail. The lower part of the front end of the front seat inflating part is connected to the lower part of the front pillar via a strap. An inflator disposed at a lower portion of a rear pillar of the vehicle is connected to a rear end portion of the gas introduction passage. The front-seat inflatable part and the rear-seat inflatable part are folded in a bellows shape in the up-down direction, and are in the form of a long head. The roof headlining car covers the front pillar garnish that covers the front pillar and the roof side rail. Covered and accommodated in the widthwise outer side.
[0005]
When the vehicle receives an impact caused by a large side collision greater than or equal to a predetermined level, the impact is detected, and high-pressure gas from the inflator connected to the gas introduction passage of the airbag is introduced into each inflation portion of the airbag. Each inflatable portion folded in the shape of a bellows expands and develops downward while pushing the outer side in the vehicle width direction of the front pillar garnish and roof head lining by its unfolding expansion force, and in the vicinity of the side door window It instantly swells like a curtain. The strap is tensioned to hold each inflatable portion in place. Thus, the impact force applied to the human body is mitigated by cushioning and supporting the upper body of the occupant with the airbag.
[0006]
[Patent Document 1]
JP-A-11-235965
[0007]
[Problems to be solved by the invention]
By the way, the front pillar garnish is made of a synthetic resin material harder than the roof head lining made of a soft synthetic resin material, and is inclined obliquely downward from the outer side of the front end of the roof head lining extending in the horizontal direction. Has been. That is, the joint portion between the front pillar garnish and the roof head lining is bent obliquely downward.
[0008]
On the other hand, it is desirable that the inflatable portion for the front seat of the airbag is inflated over a wide range of the inner surface of the side door glass on the passenger compartment side. Therefore, the hardness between the front pillar garnish and the roof head lining when the front seat inflatable part of the airbag is stored across the joint portion between the front pillar garnish and the outer side in the vehicle width direction of the roof head lining. Based on the difference, when the airbag is inflated and deployed, there is a difference in inflation and deployment between the compressed and folded portions of the airbag housed on the roof head lining side and the front pillar garnish side. In order to eliminate this expansion and expansion difference, it is necessary to apply a gas pressure difference between the front pillar garnish side and the roof head lining side so as to eliminate the expansion and expansion difference.
[0009]
Unless this requirement is satisfied, a smooth inflation and deployment operation of the airbag cannot be expected. When the inflation and deployment of the airbag becomes unbalanced, the function as an airbag that is required to be inflated and deployed instantaneously after activation of the inflator is not sufficiently exhibited. Further, since the airbag that is folded and accommodated in a bellows shape is bent at the joint portion between the front pillar garnish and the roof head lining, the gas pressure introduced into the airbag is temporarily stopped at the joint portion, and the front pillar The fact that expansion on the garnish side tends to be delayed is also a major factor that makes the expansion and expansion unbalanced.
[0010]
Further, as disclosed in Patent Document 1 described above, the general side airbag has a strap that connects the front end lower portion of the front seat inflating portion and the lower portion of the front pillar. Remove the air from the long air bag in the longitudinal direction of the car body when flattened, and then fold it into a bellows shape in the vertical direction, and store it from the vicinity of the pillar garnish along the outer side in the vehicle width direction of the roof head lining The lower part of the front end of the front seat inflating part is connected to the lower part of the front pillar via the strap, and is drawn toward the front pillar side by the strap that rotates about the lower part of the front pillar. The joint between the pillar and the roof side rail will be exceeded. As a result, the inflatable part for the front seat is accommodated across the front pillar, and the above problem occurs.
[0011]
In order to cope with such a situation, it is also possible to remove the installation area of the front pillar and accommodate it in the roof head lining by setting the turning radius of the strap to the joint portion between the front pillar and the roof side rail. However, if this is done, it will not be possible to extend and expand the airbag toward the pillar garnish. Therefore, the request | requirement which is going to obtain the front and back with respect to the vehicle interior side inner surface of a side door glass and the upper and lower wide bulging surface cannot be met.
[0012]
The present invention has been made to solve the conventional problems, and a specific object of the present invention is that it can be stored compactly without being bulky at a predetermined position of the vehicle body, and can be easily mounted on the vehicle body. Another object of the present invention is to provide an air bag for a vehicle body window that can obtain an inflated and deployed configuration that can stably cushion and support an occupant when inflated and deployed.
[0013]
[Means for solving the problems and effects]
The present invention is an air bag having a bag structure in which inner surfaces of a woven fabric are locally coupled at one or more locations, and has a cylindrical long edge portion attached along the longitudinal direction of a vehicle body window frame, and at least It communicates with a partial region of the long edge, extends in the vertical width direction of the vehicle body window frame, folds in the direction of the short edge when not inflated, and unfolds to cover the window when inflated. A plurality of joints arranged over the long edge portion, and an inflatable portion formed on at least a part of the unfolded portion and a non-inflatable portion formed adjacent to the longitudinal direction of the inflatable portion. A plurality of expansion chambers divided by a portion, and adjacent expansion chambers Between A communication passage communicating with the non-inflatable portion; Of the expansion chamber It has a position changing means capable of displacing the deployment position in the longitudinal direction during expansion and non-expansion, The position changing means has a plurality of slits which are long in the vertical width direction of the base fabric constituting the non-expandable portion and whose tips reach the outer edge portion of the base fabric and expand at the outer edge. The main feature is an airbag characterized by this.
[0014]
When forming the airbag, the occupant-facing base fabric and the window-facing base fabric are made of a single woven fabric, and the outer peripheral edge is overlapped with the gas inlet and the non-inflatable portion of the facing base fabric remaining. The part may be fixed by sewing or the like to form a bag, or the occupant-facing base fabric and the window-facing base fabric are composed of two separate woven fabrics, and the gas inlet port of the opposing base fabric The pair of base fabrics may be sewn and integrated while leaving the non-inflatable portion. Although the folding form of the airbag at the time of accommodation is not particularly limited, it is attached along the roof side rail from the vicinity of the pillar of the vehicle body window frame in a compressed state folded in a bellows shape in the vertical direction. The roof head lining that covers the frame is accommodated on the back surface of the outer side portion in the vehicle width direction.
[0015]
Now, if the vehicle receives an impact due to a large side collision or rollover that exceeds a predetermined level, the inflator will be activated and a large amount of highly compressed gas will intrude into the air bag instantaneously, and it will be instantly strong against the air bag fabric. A large expansion pressure is applied, and the force acts on the roof head lining. At this time, the airbag extends and expands from the accommodation position on the back side of the roof head lining toward the deployed position while pushing the outer side in the vehicle width direction of the roof head lining downward, and instantaneously near the door window. Inflates.
[0016]
In general, when the inflatable portion of the airbag is accommodated across the joint portion between the roof head lining and the pillar garnish that is bent obliquely downward from the outer edge of the vehicle body in the longitudinal direction, the bellows shape is obtained. The airbag accommodated by being folded is bent at the joint portion. The storage capacity of the joint portion is limited, and the end of the airbag is bulky and cannot be stored, or the gas pressure introduced into the airbag is temporarily stopped at the joint portion and the pillar garnish side Expansion of the air bag tends to be delayed, and the expansion and deployment of the airbag becomes unbalanced. In order to cope with such a state, when the joint portion is removed and accommodated in the roof head lining, the inflation and deployment of the airbag cannot be expanded toward the pillar garnish side.
[0017]
In the airbag according to the present invention, the non-inflatable portion formed adjacent to the longitudinal direction of the inflatable portion has a position changing means capable of displacing the deployed position in the longitudinal direction during inflation and non-inflation. is doing. For this reason, when the airbag is not inflated, that is, when the airbag is accommodated, even if the airbag is accommodated on the back side of the roof head lining while avoiding the installation site of the pillar garnish, the airbag is not restricted by the pillar garnish. The air bag's inflatable part can be expanded over a wide range toward the pillar garnish side without delaying the timing of popping out of the air bag, and the deployment behavior of the air bag can be stabilized, so that it can be expanded over a wide range between the window and the occupant. As a result, the occupant can be bulged, and the occupant can be buffered and supported smoothly and quickly.
[0018]
On the other hand, when the airbag is accommodated, the deployment position of the airbag can be displaced in the longitudinal direction at the time of inflation, so that the joint portion can be removed and accommodated in a compact folded form without being bulky in the roof head lining. Thus, the folding waveform and the folding height are fixed, and can be easily attached to the vehicle body window frame. Even when a compact airbag is installed in a portion where the side space of the occupant is large, a sufficiently expanded surface of the airbag can be obtained over a wide range of the front and rear and the top and bottom of the room.
[0019]
The present invention preferably has a strap that connects one end of the inflatable portion disposed on the opposite side of the inflator and the vehicle body, and the strap is preferably non-stretchable.
Generally, the longitudinal direction of the vehicle body window frame has a non-linear shape that curves upward, and the long edge portion of the airbag that is attached along the longitudinal direction has a non-linear shape that matches the non-linear shape. is doing. When the inflating part of the airbag is inflated, the overall length of the airbag is reduced by the inflating of the inflating part, and the strap is tensioned. In the present invention, when the tension is applied to the airbag by the tension applied to the strap, the position changing means deploys the non-inflatable portion in the longitudinal direction along with the movement of the strap. The airbag is held at a desired position below the pillar garnish by the tension of the strap. In this way, the inflating surface of the inflating part extends greatly below the pillar garnish, and it can be ensured that the inflating part can be smoothly and reliably deployed at a desired position between the window and the occupant without interfering with the vehicle body. .
[0020]
In the airbag that expands the deployment position as described above, the inflatable portion is divided into two or more through the non-inflatable portion along the long edge portion, and the non-inflatable portion and each inflatable portion are continuous. It is preferable to be formed.
By disposing the inflating portion at a desired position along the longitudinal direction of the vehicle body window frame, it is possible to sufficiently obtain the bulging surface of the airbag over a wide range of front and rear and upper and lower positions between the window and the occupant. Thus, the safety of the passenger sitting in the front seat and the passenger sitting in the rear seat can be ensured.
[0021]
As a preferred first aspect of the position changing means of the non-expanding portion, the position changing means is formed of a slit that expands in the longitudinal direction during expansion.
When the non-inflatable part formed adjacent to the longitudinal direction of the inflatable part of the airbag is made of a non-stretchable fabric, by forming the slit in the non-inflatable part as the position changing means, The inflating and deploying downward of the inflating portion can be positively expanded, and good inflating and deploying characteristics of the airbag can be obtained. By appropriately setting the shape of the slit, the installation position, the number of installations, and the like, the expansion range in the longitudinal direction of the expansion portion can be controlled.
[0022]
Furthermore, in this invention, the said position change means can be comprised from a highly elastic cloth as a 2nd aspect of the said position change means of the said non-expanding part.
As the stretchable fabric, the constituent yarn itself of the non-expandable portion itself may be stretchable, and the non-expandable portion itself may be composed of a stretchable fabric or knitted fabric. For stretch fabrics, warp and weft, which are constituent yarns, use stretch yarns that freely stretch in the longitudinal direction when expanded, or in the case of knitted fabrics, do not use stretch yarns in particular. However, it itself has elasticity. When the non-inflatable portion is made of a stretchable fabric, it is not necessary to form the slit in the non-inflatable portion, and an occupant can be obtained by extending the non-inflatable portion in the longitudinal direction when the airbag is inflated. An ideal form of deployment can be obtained to mitigate the impact received by.
[0023]
In forming the non-inflatable portion, although not particularly limited, for example, by cutting a partial region of one base fabric of the occupant-facing base fabric and the window-facing base fabric, One flat plate-shaped non-inflatable portion may be formed by overlapping and fixing by sewing or the like. Alternatively, the non-inflatable portion is a separate piece of the occupant-facing base fabric and the window-facing base fabric. The outer peripheral edge of the constituent fabric can be formed by adhering to a portion obtained by cutting a partial region of at least one base fabric by sewing or the like.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings.
FIG. 1 is a front view schematically showing an airbag as a typical embodiment of the present invention, and FIG. 2 is a front view schematically showing the deployed state of the airbag as seen from the vehicle interior side. In the present embodiment, an airbag for a vehicle body window frame that is attached to a roof side rail portion that constitutes a part of the window frame of the vehicle body will be described as an example, but the present invention is limited to this. Instead, it can be effectively used for a side airbag device attached to the inside of a door panel of a rear seat or a front seat, for example.
[0025]
In these drawings, reference numeral 1 denotes an airbag for a vehicle body window frame that is long in the longitudinal direction of the vehicle body. An airbag 1 according to the illustrated example includes a cylindrical long edge portion 3 having a gas inlet 2 connected to an inflator (not shown) that generates inflation gas, and a first inflatable portion 4 that is inflated and deployed on the front seat side. A second inflatable portion 5 that is inflated and deployed on the rear seat side, a non-inflatable portion 6 that is formed continuously in the longitudinal direction between the inflatable portions 4 and 5, and an upper end edge of the long edge portion 3. And six mounting pieces 7 for mounting the vehicle body. The inflatable portions 4 and 5 are respectively communicated with a partial region of the cylindrical long edge portion 3 and extend downward from the lower edge of the long edge portion 3. Highly compressed gas from the gas inlet 2 is introduced. The inner surfaces of the inflatable portions 4 and 5 are partially fixed to each other, and the inflatable portions 4 and 5 have six inflating chambers 8 in the horizontal direction so as to form a plurality of vertically elongated tubes when inflated. It is divided into.
[0026]
The airbag 1 is accommodated in a state in which the airbag 1 is densely compressed in a required form over the front pillar portion PF, the roof side rail portion R, and the rear pillar portion PR in the vehicle interior. The inflating parts 4 and 5 are covered with a roof head lining of a roof side rail part R arranged between a front pillar garnish arranged in the front pillar part PF and a rear pillar garnish arranged in the rear pillar part PR. The roof side rail portion R has a non-linear shape whose front end portion and rear end portion are curved upward, and the long edge portion 3 has a non-linear shape that matches the roof side rail portion R at the time of mounting. . The attachment piece 7 provided at the upper edge of the long edge 3 is formed corresponding to the attachment part of the roof side rail R, and is attached via fixing means such as attachment bolts and nuts (not shown). .
[0027]
In the present embodiment, the expansion portions 4 and 5 are arranged before and after the vicinity of the rear pillar portion PR and the vicinity of the front pillar portion PF, and the non-expansion portion 6 is arranged at a portion corresponding to the center pillar portion PC of the vehicle. The The lower part of the front end of the expansion part 4 and the lower part of the front pillar part PF are connected via a strap 9. The strap 9 is accommodated in the front pillar garnish of the front pillar portion PF. The inflator is disposed below the rear pillar portion PR.
[0028]
In addition, the folding form of the airbag 1 at the time of accommodation is not specifically limited, For example, you may wind up and fold in the shape of a spiral, but in this embodiment, it is in the shape of a bellows that overlaps with each other in the vertical direction. Folds in a compressed state. Moreover, the assembly procedure and attachment method of the airbag 1 are not particularly different from conventional ones.
[0029]
The airbag 1 according to the illustrated example is composed of a woven fabric composed of an occupant facing base fabric 10 and a window facing base fabric 11. These opposing base fabrics 10 and 11 are made of a single piece of cloth material whose central portions are connected. Since this airbag 1 is comprised from the cloth material of 1 sheet, the work man-hour in a sewing process can be shortened. The opposed base fabrics 10 and 11 have a basis weight of 200 g / m using, for example, 315 denier nylon 66 yarn. ² The surface is coated with a resin such as rubber or silicone resin.
[0030]
An intermediate portion of the occupant-facing base fabric 10 is cut into a substantially rectangular shape including a part of the window-facing base fabric 11, and an outer peripheral edge portion 12 of the opposing base fabrics 10, 11 is the gas introduction port. 2 is sewn and integrated into a bag shape. An intermediate portion of the window-facing base fabric 11 is made of a single flat-plate-like cloth material, and is the non-inflatable portion 6. A cylindrical inner tube 13 extends to the vicinity of the non-expandable portion 6 on the inner peripheral surface of the gas inlet 2 of the long edge portion 3. The inner tube 13 is formed by bag weaving using the same material as the opposed base fabrics 10 and 11, and has a sufficient strength to withstand the gas pressure. In order to ensure the heat resistance against the highly compressed gas from the inflator, the inner tube 13 may contain a resin such as rubber or silicone resin.
[0031]
In the present embodiment, the center portions of the opposing base fabrics 10 and 11 are connected and integrated into a single piece of cloth material. However, the present invention is not limited to this, for example, facing The base fabric may be made of two independent cloth materials, and the outer peripheral edge portions may be sewn together to be integrated. Of course, the outer peripheral edge portions of the opposed base fabrics 10 and 11 may be fixed by an adhesive instead of sewing.
[0032]
By the way, when the inflatable portion of the airbag is accommodated across the joint portion where the front pillar garnish is bent and joined to the edge of the roof head lining in the vehicle body front direction, the airbag is folded and accommodated in a bellows shape. The airbag is bent at the joint portion. There is a limit to the storage capacity of this joint part, and the end of the airbag becomes bulky and cannot be stored, or complicated work processes increase, making it difficult to perform installation work, reducing work efficiency. In addition, the work cost is increased. Further, the gas pressure introduced into the airbag is temporarily stopped at the joining portion, and the inflation on the front pillar garnish side is easily delayed, and the inflation and deployment of the airbag becomes unbalanced. In order to cope with such a state, when the joint portion is removed and accommodated in the roof head lining, the inflated surface of the airbag cannot be expanded toward the front pillar garnish side. Therefore, it is important to sufficiently exhibit the function of the airbag device that attempts to obtain wide front and rear and upper and lower bulging surfaces of the side door glass with respect to the inner surface of the passenger compartment.
[0033]
The most characteristic feature of the present invention resides in that the non-expanding portion 6 has position changing means capable of displacing in the longitudinal direction of the long edge portion 3 at the time of expansion and at the time of non-expansion. . In the illustrated example, four parallel slits 14,..., 14 constituting a part of the characteristic part of the present invention are arranged in parallel at the lower edge of the window facing base fabric 11. These slits 14 are formed by notches that are linearly cut in the vertical direction so as to expand in the longitudinal direction of the long edge portion 3 when expanded. In the case where the non-inflatable portion 6 is made of a fabric having poor stretchability, it is particularly effective to form the slit 14. When the airbag is inflated, the slit 14 causes the lower ends of the inflatable parts 4 and 5 to extend in the longitudinal direction toward the front pillar part PF.
[0034]
The strap 9 holds the airbag 1 that is inflated and deployed at a desired position in a tensioned state, and is preferably non-stretchable. The strap 9 extends from the vicinity of the joint portion between the front pillar portion PF and the roof side rail portion R to the fixing portion of the front pillar portion PF. This fixing portion is the rotation center O of the strap 9. As shown in FIG. 2, the rotation center O is such that the rotation lower end position P1 of the expansion portion 4 when the slit 14 is expanded is in the vicinity of the joint portion between the front pillar portion PF and the roof side rail portion R. It is particularly preferable to set the position so as to be closer to the front pillar portion PF than the rotation limit position P <b> 2. The material and form of the strap 9 are not particularly limited.
[0035]
FIG. 2 schematically shows a deployed form when the airbag 1 is fully inflated. Now, when the vehicle receives a large side impact that exceeds a predetermined level, the impact is detected and a large amount of highly compressed gas from an inflator (not shown) instantly enters the airbag 1. When highly compressed gas is introduced into the airbag 1, a strong inflation pressure is instantaneously applied to the woven fabric of the airbag 1, and this force acts on the roof head lining made of the soft resin of the roof side rail portion R. . The inflatable portions 4 and 5 of the airbag 1 expand and deploy downward while pushing the outer portion of the roof head lining, and instantly inflate in the vicinity of the door window portion.
[0036]
The upper edge portion of the airbag 1 is attached along the roof side rail portion R that forms a non-linear shape that curves upward as described above. When the airbag 1 is inflated, the length of the upper edge is constant, but the entire length of the lower end of the airbag 1 is shortened by the inflation of the inflatable portions 4 and 5, the strap 9 is tensioned, A tensile force is also applied to the lower end of the bag 1. Due to the tension applied to the strap 9, the lower end portion of the airbag 1 is tensioned back and forth between the rear pillar portion PR and the front pillar portion PF together with the strap 9, but the slit 14 is provided in the non-inflatable portion 6. Therefore, the slit 14 is expanded in the longitudinal direction of the roof side rail portion R together with the movement of the strap 9, and the lower end portion of the airbag 1 is moved and held at a desired position below the front pillar portion PF. To do.
[0037]
Thus, the unfolding form occupying the space below the front pillar portion PF is smoothly and quickly deployed, and the bulging surface of the inflating portion 4 is greatly inflated forward from the front edge of the roof head lining in the vehicle body direction. By forming the slit 14 in the non-inflatable portion 6, the deployment behavior of the airbag 1 can be stabilized, and the airbag 1 can be expanded and expanded to a desired position between the window and the occupant, Good inflation and deployment characteristics of the airbag 1 can be obtained.
[0038]
FIG. 3 shows a modification of the airbag 1 according to the present invention. In addition, the same member name and code | symbol are attached | subjected to the member substantially the same as the said embodiment in the same figure. Therefore, the detailed description regarding these members is omitted. The modification shown in the figure is the same as the above embodiment in that it has slits 14 arranged in parallel at a lower end edge of the non-inflatable portion 6 with a desired interval. , 15 is different from the above embodiment in that three parallel slits 15,..., 15 are notched linearly in the vertical direction. The upper slit 15 is set longer than the lower slit 14, and the lower end of the slit 15 extends between the slits 14. Since these position changing means are configured by cutting, they are easy to form.
[0039]
FIG. 4 schematically shows an example of a deployed state when the airbag 1 shown in FIG. 3 is fully inflated. Compared with the airbag 1 according to the above-described embodiment, the airbag 1 according to this modification can inflate and expand the inflatable portion 4 further toward the space below the front pillar portion PF. In addition, the extension range in the longitudinal direction at the lower end of the airbag 1 can be controlled by appropriately setting the length and center of rotation of the strap 9, the shape of the slits 14 and 15, the installation position, the number of installations, and the like. Can do.
[0042]
Further, the arrangement position and the number of installations of the expansion parts 4 and 5 are not limited to the present embodiment, but are desired along the longitudinal direction of the roof side rail part R instead of one expansion part as in the illustrated example. By disposing the inflating portions 4 and 5 at the position, the inflating surface of the airbag 1 can be expanded over a wide range in the vertical direction and the front-rear direction between the window and the occupant, and the occupant seated in the front seat and Sufficient safety for passengers seated in the rear seat can be ensured.
[0043]
Also, when not deployed, the front pillar PF is removed and stored in the roof side rail R in a compact manner. When inflated, the passenger's protection range can be expanded without increasing the bag volume. The amount of gas supplied is reduced, and a high-power inflator need not be used to obtain a predetermined expansion pressure. Therefore, an increase in manufacturing cost and an increase in the weight of the entire airbag device can be prevented without increasing the size of the entire airbag device. Further, since the airbag is accommodated in the roof side rail portion R avoiding the bent joint portion between the front pillar portion PF and the roof side rail portion R, it can be easily and smoothly attached, and the work efficiency can be improved. There will be no reduction or high work costs.
[0044]
In the illustrated example, five coupling portions 16,..., 16 that are non-inflatable portions tightly adhere a part of the inner surfaces of the opposing base fabrics 10, 11 in a line shape so as to ensure the tension of the airbag 1. Is formed. Since the inflating portions 4 and 5 are locally joined to each other at one or more locations by the joining portion 16 at the inner side of the woven fabric, the six inflating chambers 8 over the long edge portion 3 of the airbag 1. , 8 are formed, and the expansion chambers 8 communicate with each other via the long edge portion 3 and the communication passage 17. For this reason, the expansion chambers 8 can be sufficiently permeable to each other, and when an external pressure is applied to the airbag 1 after being inflated and deployed, the highly compressed gas in the airbag 1 is evacuated. Even if the vent hole is not actively formed, an appropriate cushioning property can be obtained to alleviate the impact received by the occupant.
[0045]
The terminal portion of the joint portion 16 is formed in a closed loop shape that surrounds in a circular shape, and ensures the joint strength between the opposing base fabrics 10 and 11. The joint portion 16 locally sews the inner surfaces of the opposing base fabrics 10 and 11 and is covered with a silicon-based or urethane-based elastic adhesive. These stitch lines can be touched or double stitched. The coupling portion 16 has a function of regulating the thickness of the inflatable portions 4 and 5 and can reduce the amount of gas required to inflate and deploy the airbag 1, and is completed from the start of inflation of the airbag 1. Can be shortened. In addition, when the said connection part 16 is formed in flat plate shape, for example, it cannot be overemphasized that the said position change means can be provided.
[0046]
As is clear from the above description, the airbag 1 according to the present embodiment can be displaced in the longitudinal direction of the roof side rail portion R when the airbag 1 is inflated. The airbag 1 is not restricted by the front pillar portion PF, and the airbag 1 can be expanded over a wide range toward the front pillar portion PF without delaying the pop-out timing of the airbag 1, and the deployment behavior of the airbag 1 is also improved. Can be stabilized, and can be expanded over a wide range between the window and the occupant, and the occupant can be buffered and supported smoothly.
[0047]
Further, when the airbag 1 is accommodated, the deployment position of the airbag 1 when inflated can be displaced in the longitudinal direction of the roof side rail portion R, so that the installation site of the front pillar portion PF is avoided and the roof head lining is compact and compact. It can be accommodated with a simple folding form, the folding waveform and folding height are made constant, and can be easily attached to the vehicle body. Even when the compact airbag 1 is installed in a portion where the side space of the occupant is large, the bulging surface of the airbag 1 can be sufficiently secured over a wide range of the front and rear and the top and bottom of the room.
[0048]
In the above-described embodiments and modifications, the front end lower portion of the front seat inflating portion 4 and the front pillar portion PF are connected via the strap 9, and the inflator is disposed on the rear pillar portion PR. For example, the rear end lower portion of the rear seat inflating portion 5 and the rear pillar portion PR are connected via the strap 9, and an inflator can be disposed on the front pillar portion PF. Naturally, the technical scope which can be easily changed by those skilled in the art from the modifications is included.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing an airbag which is a representative embodiment of the present invention.
FIG. 2 is a front view schematically showing an example of a deployed form of the airbag.
FIG. 3 is a front view schematically showing a modification of the airbag.
4 is a front view schematically showing an example of a deployment form of the airbag shown in FIG. 3. FIG.
[Explanation of symbols]
1 Airbag
2 Gas inlet
3 Long edge
4,5 Expansion part
6 Non-inflatable part
7 Mounting piece
8 Expansion chamber
9 Strap
10,11 Opposite base fabric
12 Outer peripheral edge
13 Inner tube
14,15 slit
16 joint
17 Communication passage
PC center pillar
PF Front pillar
PR Rear pillar
R Roof side rail part

Claims (3)

An airbag (1) having a bag structure in which inner surfaces of a woven fabric are locally coupled at one or more locations,
A cylindrical long edge portion (3) attached along the longitudinal direction of the vehicle body window frame (PF, PR, PC);
The vehicle body window frame (PF, PR, PC) communicates with at least a partial region of the long edge portion (3), extends in the vertical width direction of the vehicle body frame (PF, PR, PC), is folded in the short edge direction when not inflated, and is expanded when inflated. An inflatable part (4,5) formed in at least a part of the folded form unfolded so as to cover the window;
A non-expandable part (6) formed adjacent to the longitudinal direction of the inflatable part (4,5);
With
The expansion part (4, 5) has a plurality of expansion chambers (8, ..., 8) divided by a plurality of coupling parts (16, ..., 16) arranged over the long edge part (3),
A communication path (17) communicating between the adjacent expansion chambers (8, ..., 8);
The non-expanding part (6) has a position changing means capable of displacing the expansion position in the longitudinal direction when the expansion chamber is expanded and not expanded,
The position changing means has a plurality of slits (14) that are long in the vertical width direction of the base fabric constituting the non-inflatable portion (6) and whose tips reach the outer edge portion of the base fabric and expand at the outer edge. Have
An airbag characterized by that.   A strap (9) that connects one end of the inflating portion (4) disposed on the opposite side of the inflator and the vehicle body, and the strap (9) is non-stretchable. The described airbag.   The inflatable part (4,5) is divided into two or more along the long edge part (3) through the non-inflatable part (6), and the non-inflatable part (6) and each inflatable part (4,5) 3. The airbag according to claim 1, wherein the airbag is formed continuously.

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