JP3914425B2 - Airbag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an airbag that is folded and stored and inflated and deployed by introducing gas.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a so-called curtain airbag that is deployed along a side window portion of an automobile is known as an airbag that expands by introducing gas. For example, as shown in Japanese Patent No. 3138816, with respect to a curtain airbag that is arranged to be elongated along a roof side rail of an automobile, a bellows in which a folded piece of the bag-shaped airbag body is substantially horizontal. There is known a configuration in which the folded shape is covered with a cylindrical cover formed of a nonwoven fabric and held in a folded shape. The cover has a seam formed by sewing a rectangular non-woven fabric at the lower end, and an attachment slit through which an attachment piece for attaching the airbag body to another member or an inflator is inserted along the upper end. Has been. Further, the cover is formed with a breaking slit that is easily broken when the airbag body is inflated and deployed along a surface facing the outside of the vehicle body.
[0003]
[Problems to be solved by the invention]
As described above, with respect to the curtain airbag that is deployed along the side window portion of the automobile, when gas is supplied to the airbag body, pressure that is deployed in the vertical direction is easily applied. For this reason, a large force is applied to the upper mounting slit and the lower sewing portion, while the force applied to the side breaking slit is indirect, and the upper mounting slit and the lower sewing portion are In order to break the side breaking slits without breaking, it is necessary to use a base fabric having a high strength, which causes problems such as an increase in manufacturing cost.
[0004]
The present invention has been made in view of these points, and an object of the present invention is to provide an airbag that rapidly breaks a covering member that holds a folded shape and inflates and deploys in a predetermined direction.
[0005]
[Means for Solving the Problems]
The airbag according to claim 1 comprises an airbag body that is formed in a flat bag shape and is inflated and deployed by introducing gas, and a covering member that covers the folded airbag body and holds the folded shape. An airbag disposed in a roof side portion of a vehicle compartment of an automobile, wherein the airbag main body has a ventilation position where gas is introduced and an arm portion that communicates with the ventilation position and extends radially from the ventilation position. A conduit portion that is folded and a collecting portion that is communicated and folded along the longitudinal direction of the conduit portion, and the covering member includes a break portion that is easily broken along the conduit portion, and is broken. The portion is disposed toward the inside of the passenger compartment, the collecting portion is disposed along the lower side of the ventilation position of the conduit portion, and the arm portion is disposed along the outer peripheral portion of the collecting portion. Against the inside and outside of the passenger compartment It surrounds the collecting portion located bets, and one in which part of the inflation and deployment of the one arm located at the internal side of the casing is arranged to face the fracture portion.
[0006]
In this configuration, when gas is introduced into the airbag, the gas is supplied along the ventilation position of the conduit portion, and the arm portion of the folded conduit portion is inflated and deployed to quickly break the opposing fracture portion. To break. And when the arm part along a gathering part develops, a gathering part is guided. That is, the collecting portion is slightly moved toward the inside of the passenger compartment, and the collecting portion is stably pushed downward. Further, the gas is supplied from the ventilation position of the conduit portion to the collecting portion, and the entire airbag is inflated and deployed downward in a predetermined direction according to the folded shape of the collecting portion.
[0007]
Airbag 請 Motomeko 2 wherein, in the airbag according to claim 1 Symbol placement, the conduit section, a ventilation position communicating from one end to the gas is introduced to the other end, along the longitudinal direction in the ventilation position And an arm portion that communicates with the breaking portion.
[0008]
In this configuration, when gas is introduced into the airbag, the gas is smoothly and rapidly supplied from one end to the other end along the ventilation position of the conduit portion. The arm portion communicating with the ventilation position quickly breaks the breakage portion and guides the unfolding direction of the gathering portion.
[0009]
Airbag according to claim 3, wherein, in the airbag according to claim 1 or 2, wherein the breaking unit is one that is slit cut at predetermined intervals along the longitudinal direction.
[0010]
And in this structure, since a fracture | rupture part is formed by the slit by cutting, other components are not required and manufacturing cost is reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an airbag according to the present invention will be described with reference to the drawings.
[0012]
In FIG. 2, reference numeral 1 denotes an airbag, and an airbag device 2 including the airbag 1 is disposed on a roof side portion 5 of a passenger compartment 4 of an automobile 3 as a vehicle. And this airbag 1 is also called a curtain airbag, a side impact airbag, a side airbag, an inflatable curtain type, or a head protection airbag, and when subjected to an impact such as a side collision, It expands in a planar shape on the side of the occupant and protects the occupant A, which is the object to be protected.
[0013]
In addition, the automobile 3 includes a front seat and a rear seat in which a passenger A can sit in a passenger compartment 4, and a window portion (side window) 6 that can be opened at an upper portion corresponding to the front seat and the rear seat. A door is provided. Further, an A pillar, a B pillar, and a C pillar are provided in order from the front side on both sides of the passenger compartment 4, and a ceiling panel 15 is supported on the upper side of these pillars via a roof side rail 14. Further, a pillar garnish is attached to the side of the passenger compartment 4 of each pillar, and a headlining 17 which is a soft or deformable ceiling plate is provided on the side of the passenger compartment 4 from the ceiling panel 15 to the roof side rail 14. And a packing body 19 that is in close contact with the doors is attached at a position where the upper portions of the doors abut. Each seat is provided with a seat belt, and the pillar is provided with a support portion for supporting these seat belts.
[0014]
The airbag device 2 is a so-called front / rear seat airbag capable of protecting the passengers in the front and rear seats, and is stored in an elongated state in the roof side portion 5 surrounded by the roof side rail 14 and the head lining 17. The airbag 1 and an inflator that is stored above the passenger in the rear seat and supplies gas to the airbag 1 are attached to the roof side rail 14 using bolts 24 or the like as attachment members. .
[0015]
And the airbag 1 is provided with the airbag main body 31 formed in the flat bag shape combining the some base fabric, as shown in FIG. 1 thru | or FIG. A tension strap 32, which is a string-like base fabric, is attached to the front end portion of the airbag body 31. Further, as shown in FIGS. 1 and 4 and the like, the airbag 1 is covered with a covering member 33 and held in a folded shape.
[0016]
As shown in FIG. 3, the airbag main body 31 is a joint portion formed by overlapping an outer base fabric 35 disposed on the outer side which is the vehicle body side and an inner base fabric 36 disposed on the vehicle compartment 4 side. A bag-like inflatable portion 38 that is inflated and inflated by inflow of gas by stitching at a predetermined sewing portion 37, and one end that communicates with the inflatable portion 38 at the rear upper part of the airbag body 31 at the rear of the vehicle body A gas introduction port 39 as a portion and a sheet-like non-expandable portion 41 that does not allow gas to flow in and expand and deploy are provided. Further, the inflating portion 38 is an air chamber that is a hollow portion, and is connected to a communication portion 43 located at an upper portion of a longitudinal central portion that is the front-rear direction of the airbag body 31, and before communicating with the front side of the communication portion 43. A front seat expansion chamber 44 as a seat protection portion (front seat protection area) and a rear seat expansion chamber 45 as a rear seat protection portion (rear seat protection area) communicating with the rear side of the communication portion 43 are provided. .
[0017]
The sewing portion 37 includes an outer periphery sewing portion 51 that is an outer periphery connecting portion that sews the outer periphery of the expansion portion 38, and a restriction portion 52 that restricts the width dimension when the expansion chambers 44 and 45 are deployed. The restricting portion 52 is located at one or a plurality of locations of the inflating portion 38 and is formed integrally with or separately from the outer peripheral sewing portion 51. In the present embodiment, the restricting portion 52 includes a front restricting chamber 44, a first restricting portion 54 continuous with the outer periphery sewing portion 51, a second restricting portion 55 independent of the outer periphery sewing portion 51, and outer periphery sewing. A third restricting portion 56 that is continuous to the portion 51 is formed, and fourth and fifth restricting portions 57 and 58 that are continuous to the outer peripheral sewing portion 51 are formed in the rear seat expansion chamber 45. Furthermore, the protection part 59 which protects these terminal parts is formed in the terminal part of each control part 54-58.
[0018]
A plurality of attachment pieces 62, which are attachment portions for attachment to the bracket, are formed at predetermined intervals on the upper edge of the airbag body 31, and each attachment piece 62 has a bolt 24 serving as a bag attachment point. A through hole 62a is formed.
[0019]
As shown in FIGS. 1 and 4, the airbag main body 31 is mainly folded into a shape having a conduit portion 65 and a collecting portion 66. The conduit portion 65 includes the communication portion 43 and extends from the gas introduction port 39 located at the rear end of the inflating portion 38 to the front end portion 67 as the other end portion located at the front end, that is, over almost the entire length of the airbag 1. A ventilation position B that communicates in a straight line is provided, and the ventilation position B is formed in a cylindrical shape with the ventilation position B as the center. And this conduit | pipe part 65 is folded so that it may be crushed flatly from the upper and lower sides, and the arm part 68 extended radially from the ventilation position B is formed. Further, these arm portions 68 are folded in a substantially U-shape so as to surround the gathering portion 66 located below the conduit portion 65. On the other hand, the gathering portion 66 is mainly a portion of the front seat expansion chamber 44 and the rear seat expansion chamber 45, communicates directly with the lower side of the ventilation position B of the conduit portion 65, and winds in a predetermined direction from the lower end portion. That is, it is folded in a roll shape, and is folded in a parasol roll shape in which a parasol portion and a roll portion are overlapped as a whole. Here, the predetermined direction is a direction along the window portion 6 when the gathering portion 66 is rewound. For example, the airbag 1 attached to the left side as viewed from the front is shown in FIG. As shown in FIG.
[0020]
The base fabric constituting the airbag main body 31 is coated with silicon rubber or the like, and the outer surface is light pink.
[0021]
The covering member 33 is also called a sack or the like, for example, a fiber laminated sheet material such as white tyvek (a registered trademark of DuPont), or a sheet formed by combining paper, cloth, resin, or the like alone or in combination. A rectangular sheet material formed using a sheet-like member is joined to the edge portion along the longitudinal direction by stitching together at the joining portion 70, etc., and formed into a cylindrical shape that can store the folded airbag body 31. ing. Further, the covering member 33 is in a state in which the airbag main body 31 is accommodated, and the joint portion 70 is located outside the casing 4 of the airbag main body, and is further located above the joint portion 70 so as to be attached to the mounting piece. An attachment point slit 72 through which 62 is inserted is formed.
[0022]
Further, the covering member 33 is located on the inner side of the passenger compartment 4 of the airbag main body 31, that is, opposed to one arm portion 68, and is formed with a breaking portion 74 along the longitudinal direction. And this fracture | rupture part 74 is a weak part (cleavage part) relatively weaker than the other part of the coating | coated member 33, and in this Embodiment, the slit part which cut | disconnected 10 mm and the non-cut | disconnected 5 mm The slit part is formed in a continuous shape.
[0023]
In the event of a side collision or the like of the automobile 3, when the airbag device 2 receives an impact such as a side collision, the inflator is actuated by a control device (not shown), and the gas injected from the inflator is a gas inlet 39. The air bag 1 is introduced into the air bag body 31 and supplied to the inflating chambers 44 and 45 of the gathering portion 66 while passing through the ventilation position B of the conduit portion 65 to the front end portion 67, and the air bag 1 is inflated and deployed. The front and rear windows 6 are covered in a curtain shape, and the head and chest of each occupant A in the front seat and the rear seat are protected.
[0024]
Further, the deployment of the airbag 1 will be described in detail. The collecting portion 66 folded in a roll shape has a greater resistance to gas flow during deployment than the conduit portion 65 folded so as to be crushed. First, the gas supplied from the air expands the conduit 65 as shown in FIG. At this time, the conduit 65 is directed to the inner side (in the direction of arrow F1 shown in FIG. 5), the outer side (in the direction of arrow F2 shown in FIG. 5), and the upper side (the direction of arrow F3 shown in FIG. 5). Thus, it expands and deploys while applying a relatively large force to the lower side (in the direction of arrow F4 shown in FIG. 5). That is, the impact force that expands the arm portion 68 and the like of the conduit portion 65 is directly applied to the breaking portion 74 of the covering member 33, and tension is applied to the portion of the breaking portion 74, so that the breaking portion 74 is smoothly and quickly applied. Break.
[0025]
Then, along with the breakage of the breakage portion 74, the headlining 17 is pushed by the expansion of the conduit portion 65 to secure the protruding opening of the airbag 1, and the reaction force that the conduit portion 65 pushes the vehicle body surface. Thus, the gathering portion 66 moves to the passenger compartment 4 side.
[0026]
Further, when the conduit portion 65 expands, as shown by a two-dotted line C in FIG. 2, the collecting portion 66 is pushed downward by the expanding conduit portion 65 and is guided by the arm portion 68 of the conduit portion 65, and downward. It is pushed out stably.
[0027]
Further, after that, gas is supplied from the conduit portion 65 to the collecting portion 66, and as shown by a two-dotted line D in FIG. 2, the collecting portion 66 is moved downward so as to roll along each window portion 6 or each pillar. The head of the occupant A can be protected by unfolding.
[0028]
Thus, according to the present embodiment, the airbag body that is folded in the airbag 1 that is deployed from the roof side rail 14 side along the inner surface of the window 6 and protects the head of the occupant A and the like. The covering member 33 that houses 31 can be quickly and smoothly broken at a predetermined breaking portion 74, and can be rapidly and smoothly inflated and deployed to a predetermined position.
[0029]
That is, according to the present embodiment, the breakage portion 74 is disposed in a state of facing and directly contacting the conduit portion 65 that is inflated prior to the gathering portion 66 of the airbag main body 31. The breaking portion 74 can be quickly and smoothly broken by the impact force.
[0030]
In addition, since the breaking portion 74 is formed toward the inside of the passenger compartment 4, at the initial stage of deployment, the airbag body 31 is deployed so as to push away the headlining 17, and then deployed downward. 1 and interference with each pillar, seat belt or occupant A can be suppressed and deployed stably.
[0031]
And since the rupture part 74 is a slit cut at a predetermined interval along the longitudinal direction, it can be formed only by cutting work, for example, it can be formed simultaneously with cutting of the sheet material, no other parts are required, and the manufacturing cost is reduced. Can be reduced.
[0032]
Further, since the airbag main body 31 is, for example, light pink, and the covering member 33 is, for example, white, the airbag main body 31 can be visually recognized through the slit portion of the breaking portion 74. Thus, by making the airbag body 31 and the covering member 33 different in color, the portion of the broken portion 74 can be visually recognized as a color line. Therefore, the airbag 1 is attached to the vehicle body. It can be used as a landmark.
[0033]
Further, regarding the folding of the conduit portion 65, a folding method is provided which minimizes folding and has a low unfolding resistance, that is, a ventilation position B communicating with the entire length in the longitudinal direction. Because it is folded, gas is supplied efficiently and quickly over the entire length of the long airbag 1, and further, gas is supplied from the conduit portion 65 to the gathering portion 66, which is an occupant protection area. The airbag 1 can be deployed.
[0034]
In addition, while the conduit portion 65 rapidly expands and deploys, the roll-shaped gathering portion 66 is deployed after the conduit portion 65, so that the gathering portion 66 does not unstably unfold in the roof side portion 5, and the predetermined portion is obtained. It can be stably deployed downward in the direction.
[0035]
Further, since the conduit portion 65 is folded flat and provided with the arm portions 68 so as to wrap around both sides of the collective portion 66, when the arm portions 68 are deployed, the protruding portion of the collective portion 66 is secured and the collective portion 66 is secured. Thus, the roll-shaped gathering portion 66 can be stably deployed downward in a predetermined direction.
[0036]
Further, since the collecting portion 66 is folded in a roll shape facing the passenger compartment 4, the collecting portion 66 can be unfolded so as not to interfere with the pillar garnish, the glass of the window portion 6, the passenger A, and the like. it can.
[0037]
Further, if the airbag 1 has only the roll-shaped gathering portion 66, the resistance when the gas flows increases and the load applied to the base fabric of the airbag 1 increases, but the conduit portion is connected to the roll-shaped gathering portion 66. Since 65 is combined, the load applied to the base fabric of the airbag 1 can be suppressed.
[0038]
In addition, the breaking part 74 can be formed in a curved shape, a zigzag shape, or the like, in addition to being formed horizontally along the longitudinal direction. For example, as shown in FIG. 6, the slit portion rupture portion 74 is formed so as to incline toward the upper side, that is, close to the center portion of the conduit portion 65, and breaks more simultaneously before and after the rupture portion 74. And the airbag 1 can be simultaneously deployed in the front-rear direction.
[0039]
Further, in the present invention, since it can be stably broken at the breaking portion 74, the breaking portion 74 may be formed by a weak portion in addition to the slit, for example, a position where the sheet materials are stitched together. The fracture portion can also be formed by sewing with the joint portion facing inward.
[0040]
Further, the shapes and folded shapes of the conduit portion 65 and the collecting portion 66 are not limited to the above-described embodiment, and various shapes can be adopted.
[0041]
For example, the conduit portion 65 may be folded in a substantially cross shape that is folded so as to squeeze the upper portion of the ventilation position B from both sides, instead of the substantially T shape as described above. Further, the gathering portion 66 can be folded in a bellows shape instead of a roll shape .
[0042]
【The invention's effect】
According to the airbag of the first aspect, when gas is introduced into the airbag, the gas is supplied along the ventilation position of the conduit portion, and the folded arm portion of the conduit portion is inflated and deployed to face the airbag. The breaking portion to be broken can be quickly broken. And when the arm part along a gathering part develops, a gathering part can be guided. That is, the collecting portion can be moved slightly toward the inside of the passenger compartment, and the collecting portion can be stably pushed downward. Furthermore, the gas is supplied from the ventilation position of the conduit portion to the collecting portion, and the entire airbag can be inflated and deployed downward in a predetermined direction according to the folded shape of the collecting portion.
[0043]
According to the air bag 請 Motomeko 2 wherein, in addition to claim 1 Symbol placement effect, the gas is introduced into the airbag, the gas from one end along the ventilating position of the conduit portion Can be supplied smoothly and quickly. And the arm part connected to this ventilation | gas_flowing position can fracture | rupture a fracture | rupture part rapidly, and can guide the expansion | deployment direction of a gathering part.
[0044]
According to the airbag of the third aspect , in addition to the effect of the first or second aspect , since the fracture portion is formed by a slit by cutting, other parts are not required and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view of an airbag according to an embodiment of the present invention in a folded state.
FIG. 2 is an explanatory view showing the operation of the airbag apparatus provided with the airbag.
FIG. 3 is a side view of the airbag body of the airbag.
FIG. 4 is a side view of the airbag in a folded state.
FIG. 5 is a cross-sectional view showing the initial deployment state of the airbag.
FIG. 6 is a side view showing another embodiment of the airbag of the present invention.
[Explanation of symbols]
1 Airbag 3 Car 4 Car compartment 5 Roof side
31 Airbag body
33 Covering member
39 Gas inlet as one end
65 Conduit section
66 Assembly
67 Front end as the other end
68 arms
74 Broken part B Ventilation position

Claims (3)

An air bag body that is formed in a flat bag shape and inflates and deploys when gas is introduced, and a covering member that covers the folded air bag body and holds the folded shape, and is provided on the roof side portion of the automobile cabin An airbag to be deployed,
The airbag body includes a vent portion where gas is introduced and a conduit portion which is folded to have an arm portion communicating with the vent position and extending radially from the vent position;
The conduit portion is provided with a collective portion folded in communication along the longitudinal direction,
The covering member includes a break portion that breaks easily along the conduit portion,
The fracture portion is arranged facing the inside of the vehicle compartment,
The gathering portion is arranged along the lower side of the ventilation position of the conduit portion,
The arm portion is positioned on the inner side and the outer side of the vehicle compartment with respect to the collective portion along the outer peripheral portion of the collective portion, and surrounds the collective portion, and on the inner side of the vehicle compartment. The airbag is characterized in that a portion of one of the arm portions to be inflated and deployed is disposed to face the fracture portion. The conduit portion includes a ventilation position that communicates from one end to the other end where the gas is introduced, and an arm that communicates with the ventilation position along the longitudinal direction and faces the fracture portion. claim 1 Symbol mounting air bag. The airbag according to claim 1 or 2 , wherein the fracture portion is a slit cut at a predetermined interval along the longitudinal direction.

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