JP4199999B2 - Air bag and air bag device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an airbag that is deployed to the side of an occupant of an automobile to protect the occupant, for example.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, in order to protect an occupant from an impact at the time of an automobile collision, an airbag device that introduces gas injected from an inflator into an airbag and inflates and deploys the airbag device is used. As this type of airbag, an airbag (side airbag) that is deployed to the side of the occupant of the seat and protects the side of the occupant is known (for example, see Patent Document 1). And the airbag of this patent document 1 is normally built in the side part of the sheet | seat in the state wound by roll shape, and raises an internal pressure with the gas supplied from an inflator at the time of expansion | deployment, and cleaves a sheet | seat In addition, it is designed to unfold so that the part folded in a roll shape can be unwound.
[0003]
[Patent Document 1]
JP-A-8-216821 (first page, FIG. 1)
[0004]
[Problems to be solved by the invention]
As in the conventional case, an airbag folded in a roll shape is easy to deploy in a desired direction, for example, compared with a configuration folded in a bellows shape, but has a large ventilation resistance and needs to increase the output of the inflator for rapid deployment. There is. In particular, in the side airbag, it is necessary to have a force to cleave and push the seat at the initial stage of deployment, for example, and it is necessary to use a high-power inflator, resulting in an increase in manufacturing cost. Yes.
[0005]
This invention is made | formed in view of such a point, and it aims at providing the airbag and airbag apparatus which can reduce manufacturing cost while it expand | deploys smoothly in a desired direction.
[0006]
[Means for Solving the Problems]
請 Motomeko 1 airbag according is folded into a substantially columnar shape in a predetermined direction and a longitudinal direction, an expansion portion that is inflated and deployed in a plane in one direction that intersects the predetermined direction introduces a gas, the predetermined direction A gas introduction part set in the expansion part as a longitudinal direction, the assembly part folded including the expansion part, and the expansion part communicating with the gas introduction part are folded and the assembly A first arm portion that is folded to communicate with the gas introduction portion and disposed on one side of the collecting portion. And a second arm portion that is folded in communication with the first arm portion and arranged on the other side of the gathering portion, and the gathering portion is folded in communication with the second arm portion. When the gas is introduced from the gas introduction part, the first arm part and the second arm part Arms, is to expand the set portion.
[0007]
In this configuration, when the gas is introduced from the gas introduction portion to the expansion portion, the first arm portion, the second arm portion, and the gathering portion are developed in this order, and the first arm portion and the second arm portion that are sequentially deployed. The arm portion is guided and the gathering portion expands in a desired direction.
[0008]
Airbag according to claim 2, wherein, in the airbag according to claim 1 Symbol mounting, the set unit, in which folded into a roll.
[0009]
In this configuration, the aggregated portion folded in a roll shape has a high ventilation resistance and can be easily and stably developed in a desired direction. Therefore, at the initial stage of deployment, the guide unit rapidly deploys using the gas pressure, and at the later stage of deployment, the collecting unit develops stably in a desired direction while suppressing the gas pressure. Deployment characteristics are easily realized.
[0010]
An airbag device according to a third aspect of the present invention includes the airbag according to the first or second aspect , an inflator that supplies gas disposed in a gas introduction portion of the airbag, and the airbag and the inflator can be accommodated and opened. And a storage portion provided with a simple cleavage portion.
[0011]
In this configuration, since the airbag according to claim 1 or 2 is used, the airbag can be stably and smoothly deployed in a desired direction, and it is not necessary to increase the gas output, and the inflator can be downsized. Thus, the manufacturing cost is reduced.
[0012]
The airbag device according to claim 4 is the airbag device according to claim 3, wherein the storage portion is provided on a back portion of the seat, and the airbag is provided between a passenger seated in the seat and a side wall portion of the passenger compartment. It expands and expands.
[0013]
In this configuration, since the airbag according to claim 1 or 2 is used, the airbag is stably and smoothly deployed between the passenger seated in the seat and the side wall portion of the passenger compartment, and the manufacturing cost is reduced. An airbag device capable of performing the above is provided.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of an airbag and an airbag apparatus as a premise of the present invention will be described with reference to the drawings.
[0015]
In FIG. 1, reference numeral 10 denotes an automobile seat (seat) which is a member to be attached. The seat 10 is erected so that the angle can be adjusted from a seat portion 11 on which an occupant A sits and a rear portion of the seat portion 11. A back portion (seat back) 12 and a headrest 13 attached to the upper portion of the back portion 12 are provided. The seat 10 is a driver seat of a right-hand drive vehicle, that is, a seat 10 on the right side of the front seat of the passenger compartment 15. On the right side of the seat 10, a door trim 16 and a center pillar of a door constituting the side wall portion are provided. A garnish 17 or the like is arranged at a predetermined interval of the seat 10. In the following, directions such as front and rear, up and down, and left and right are based on the passenger compartment 15 of this automobile, and as indicated by arrows in FIG. The rearward direction is the rear B, the direction from the passenger compartment 15 to the outside (right here) is the outward direction C, the opposite direction of the outer side C (leftward here) is the inward direction D, and the vertical direction is the predetermined direction. This will be described as the vertical direction E. Here, the back portion 12 is usually provided in a slightly inclined state, but will be described as being vertically erected. That is, the predetermined direction is a direction along the longitudinal direction of the side edge portion of the back portion 12. When the back portion 12 is inclined, the predetermined direction is slightly inclined from the vertical direction.
[0016]
The back portion 12 of the seat 10 covers a metal back frame 21 constituting a core material (seat frame) with a soft urethane 22, and the urethane 22 is made of natural leather, artificial leather, cloth, vinyl or the like. It is configured to be covered with a sheet-like skin 23. A storage portion 25 is provided in a state of being located on the outer side C of the back frame 21 and surrounded by the urethane 22 and the skin 23, and an airbag device 31 including an airbag 30 is configured in the storage portion 25. Has been.
[0017]
The airbag device 31 is inflated and deployed in a plane between the occupant A seated on the seat 10 and the door trim 16 and the garnish 17 of the center pillar that constitute the side wall when subjected to an impact such as a side collision. And the side airbag which is the airbag apparatus for side collision which protects the passenger | crew's A waist | hip | lumbar part and a chest part is comprised.
[0018]
The airbag device 31 includes a bag-shaped airbag 30, an inflator 33 that supplies gas to the airbag 30, a retainer 34 that fixes the inflator 33 and the airbag 30 to the back frame 21, and these members. Cover material 35 and the like are provided.
[0019]
The airbag 30 is a relatively large one that protects from the waist to the chest, and is formed into a substantially sealed flat bag shape by sewing one or more woven fabric base fabrics with a thread. In addition, a gas introduction part 36 having a longitudinal direction E in which the inflator 30 and the retainer 34 are disposed is set on the rear side part, and a front F portion of the gas introduction part 36 has a predetermined shape. The inflatable portion 37 is folded and stored and inflated and expanded by introduction of gas. Although not shown, a woven cloth called a hanging string, a reinforcing cloth, a flameproof cloth, or the like is stitched as necessary to regulate the developed shape or improve the heat resistance. Further, the deployed shape of the airbag 30 or the inflatable portion 37 can take an appropriate configuration.In addition to the quadrangular shape in side view, for example, the inflatable portion is partitioned and a chest protector is provided on the upper front side of the waist protector It can be formed in a substantially L shape or the like in side view.
[0020]
The inflator 33 has a substantially cylindrical main body, and reacts with a propellant filled in the main body so as to inject high-temperature and high-pressure gas from a gas injection port provided on the peripheral surface of one end. A pyro type inflator or a hybrid type inflator storing compressed gas is used. Further, the retainer 34 is formed in a substantially cylindrical shape having a larger inner diameter than the outer dimension of the main body portion of the inflator 33 by a metal plate or resin. A gas injection port is formed in the front surface portion of the retainer 34, and a pair of stud bolts 38 are fixed to the inner side surface D by welding or the like. The inflator 33 and the retainer 34 constitute a gas injection means. With the inflator 33 fixed inside the retainer 34, the gas injection port of the inflator 33 and the gas injection port of the retainer 34 do not directly face each other. The gas injected from the gas injection port 33 is cooled and diffused and injected from the gas injection port of the retainer 34.
[0021]
The cover member 35 is formed as a resin case body that opens with the rear end portion as a hinge portion or a tearable cloth bag body.
[0022]
Then, the entire airbag device (airbag module) 31 is supported by the back frame 21 by inserting the stud bolt 38 of the retainer 34 from the outside into the back frame 21 and screwing and tightening the nut 39 from the inside. .
[0023]
Further, the back portion 12 of the seat 10 is provided with a cleaving portion 40 that extends in the vertical direction E along the storage portion 25. In the cleavage portion 40, the urethane 22 and the skin 23 are formed to be weaker than other portions as thin portions or sewn portions, respectively, and are broken when the airbag 30 is deployed to form a protruding port 40a. Yes.
[0024]
Next, the folded state of the inflating part 37 of the airbag 30 will be described.
[0025]
As shown in FIGS. 1 and 2, the inflatable portion 37 of the airbag 30 is mainly folded into a shape having a guide portion 41 and a collecting portion 42.
[0026]
The guide portion 41 is a parasol portion folded in a parasol shape, so that a plurality of, in the present embodiment, a pair of arms on both sides communicate directly with the gas introduction portion 36 in which the inflator 33 is disposed along the longitudinal direction. Parts 44, 45, that is, a first arm part 44 located on the right side (outer side C) of the gathering part 42 and a second arm part 45 located on the left side (inward direction D) of the gathering part 42. ing. That is, these arm portions 44 and 45 are not folded into a roll shape or a bellows shape, but are formed by extending radially from the gas introduction portion 36 by simply pushing the bag flat and extending in the longitudinal direction of the collecting portion 42. It is formed so as to surround both sides along. In other words, the guide portion 41 is configured to be folded in a manner that minimizes folding and has low deployment resistance, and is configured to be able to supply gas efficiently and quickly to the tip side.
[0027]
On the other hand, the gathering part 42 is a roll part folded in a roll shape, and communicates directly along the longitudinal direction with the gas introduction part 36 in which the inflator 33 is arranged, wound in a predetermined direction from the tip part, That is, it is folded in a roll shape. Here, the predetermined direction is a direction wound outward from the front end portion, which is the front end portion, and an outer roll direction that rotates so as to rub the door trim 16 when the aggregate portion 42 is rewound during deployment. It has become.
[0028]
Next, a deployment operation of the airbag 30 will be described.
[0029]
First, when the vehicle is subjected to an impact such as a side collision before the start-up shown in FIGS. 1 and 2, that is, from 0 ms after the start-up, the control device starts the inflator 33 and injects gas from the gas injection port. . This gas flows, for example, between the inflator 33 and the retainer 34 and is jetted forward F from the gas injection port of the retainer 34. At this time, since the guide part 41 folded so as to be crushed is smaller than the gathered part 42 folded in a roll shape, the gas flow resistance at the time of deployment is smaller, so this gas is guided before the gathered part 42. The portion 41 is inflated and deployed, and as shown in FIG. 3, the arm portion 44, 45 of the guide portion 41 is expanded in both directions, so that the storage portion 25 is quickly expanded in both directions, and the cover material 35 is At the same time as cleaving, the cleaving portion 40 is cleaved to form a protruding port 40a. Further, as shown in FIG. 4, the protruding port 40a is pushed outward C and the collecting portion 42 is pushed forward F.
[0030]
Next, the gathering portion 42 expands forward F so as to be rewound while resisting ventilation resistance. At this time, the gathering portion 42 wound in the outer roll direction is inflated and deployed so as to sink into the space between the occupant A and the door trim 16 while generating an outward force, and as shown in FIG. The waist and chest of occupant A are restrained and protected.
[0031]
As described above, according to the present embodiment, in the side airbag that is built into the seat 10 and that is deployed by cleaving the skin 23 and the like of the seat 10, the seat 10 is deployed at the time of the tearing and the side of the occupant A. Because it is a folding method that realizes the optimal deployment force that conflicts with each stage when inflated and deployed, the specifications of the inflator 33 and airbag 30 with the minimum output are highly stable while suppressing manufacturing costs Unfolding characteristics can be realized.
[0032]
That is, since the airbag 30 is a parasol fold in which the assembly portion 42 that is folded in a roll shape is disposed between the plurality of arm portions 44 and 45 of the guide portion 41, as shown in FIG. Since the arm portions 44 and 45 of the guide portion 41 efficiently utilize the pressure of the gas and rapidly deploy outward C away from the occupant A with a large deployment force, the cleavage portion without interfering with the occupant A The storage portion 25 and the projecting opening 40a can be efficiently and stably expanded by rapidly cutting 40 and cleaving it.
[0033]
On the other hand, in the latter stage of deployment when the airbag 30 advances to the side of the occupant, the gathering part 42 is deployed, but the gathering part 42 folded in a roll shape has a larger ventilation resistance than the guide part 41, and the gas pressure is increased. It can be used in a restrained manner and deployed in the vicinity of the occupant A in a soft manner with the deployment force suppressed. Furthermore, the gathering portion 42 is folded in the outer roll direction, and the front end portion of the deployment always develops an outward force, and the airbag 30 is deployed along the side wall portion of the vehicle compartment 15 such as the door trim 16, so the airbag 30 is The influence on the passenger A can be suppressed.
[0034]
Further, if the airbag 30 has only the roll-shaped gathering portion 42, the resistance when the gas flows increases, and the load applied to the base fabric of the airbag 30 increases. Since 41 is combined, the load applied to the base fabric of the airbag 30 can be suppressed.
[0035]
Further, the folding operation of the airbag 30 is simpler than the configuration in which the entire surface is folded in a bellows shape, and the manufacturing process can be facilitated and the manufacturing cost can be reduced.
[0036]
In the above-described embodiment, the guide portion 41 has a pair of arm portions 44 and 45 that communicate directly with the gas introduction portion 36 along the both sides of the assembly portion 42. Three or more arms can be provided radially from the gas inlet 36. Then, as an embodiment of the present invention, the guide portion 41, provided with an arm portion which passed sequentially communicated through the gas inlet 36, to the arm portion, it can be in communication with the collecting portion 42. For example, as shown in FIG. 6, a first arm portion 51 that communicates with the gas introduction portion 36 and is located on one side of the collecting portion 42 (inward D in the present embodiment) is provided. A second arm portion 52 is provided which communicates with the arm portion 51 and is located on the other side of the assembly portion 42 (outward direction C in the present embodiment), and further communicates with the second arm portion 52. A collecting portion 42 can be provided.
[0037]
In this configuration, when the gas is introduced from the gas introduction part 36 into the airbag 30, the gathering part 42 is deployed following the first arm part 51 and the second arm part 52 folded so as to reciprocate. In addition, the first arm portion 51 and the second arm portion 52 that are sequentially deployed can be guided to smoothly deploy the assembly portion 42 in a desired direction from a desired position. That is, in this embodiment, the first arm portion 51 that is deployed first moves the gathering portion 42 in a direction away from the occupant A, and the second arm portion 52 moves the storage portion 25 outward C. The door trim 16 can be largely pushed open to expand the gathering portion 42.
[0038]
Moreover, about a gathering part, it can also wind in the inner roll direction opposite to an outer roll direction about part or full length besides the structure wound to an outer roll direction over the full length. And in the structure wound in the inner roll direction, it can be easily and smoothly deployed by rolling on the door trim 16 during deployment.
[0039]
The airbag device 31 including the airbag 30 is installed by being embedded in the back portion 12 of the seat 10, and is also installed by being embedded in a door or pillar, that is, covered by a door trim 16 or a pillar garnish 17, etc. You can also In addition, the present invention is not limited to the configuration that deploys toward the front F, and may be applied to an appropriate airbag device that deploys in a planar shape in one direction that intersects the longitudinal direction of the folded state, such as a configuration that deploys toward the rear B. it can.
[0040]
【The invention's effect】
According to the air bag 請 Motomeko 1 wherein, when the gas is introduced into the expansion portion through the gas inlet port, to expand the first arm portion, a second arm portion, in the order of the set unit, the sequentially deploy 1 The collective portion can be developed in a desired direction by being guided by the arm portion and the second arm portion.
[0041]
According to the air bag of claim 2 wherein, in addition to claim 1 Symbol placement effect, collecting portion folded in a roll, with a large flow resistance, easily and stably developed in the desired direction. Therefore, at the initial stage of deployment, the guide unit rapidly deploys using the gas pressure, and at the later stage of deployment, the collecting unit develops stably in a desired direction while suppressing the gas pressure. Deployment characteristics can be easily realized.
[0042]
According to the airbag apparatus according to claim 3, since having an air bag according to claim 1 or 2, wherein, with the airbag is stably smoothly deployed in the desired direction, there is no need to increase the output of gas, The inflator can be downsized, and the manufacturing cost is reduced.
[0043]
According to the airbag device of the fourth aspect , in addition to the effect of the third aspect , since the airbag according to the first or second aspect is provided, there is no difference between the passenger seated in the seat and the side wall portion of the passenger compartment. It is possible to provide an airbag device that can be stably and smoothly deployed in between and can reduce manufacturing costs.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a state before deployment showing an embodiment of an airbag apparatus as a premise of the present invention.
(a) is a sectional view taken along line II of (b)
FIG. 2 (b) is a perspective view of the seat. FIG. 2 is a perspective view in which the airbag and the inflator are partially cut away showing the folded state of the airbag.
FIG. 3 is an explanatory diagram of a state after 3 milliseconds after activation at the time of deployment showing the airbag device same as above.
(a) is a sectional view corresponding to II in FIG. 1 (b).
(b) is a perspective view of the seat. FIG. 4 is an explanatory view of a state after 5 milliseconds after the start-up following FIG. 3 showing the airbag apparatus.
(a) is a sectional view corresponding to II in FIG. 1 (b).
(b) is a perspective view of the seat. FIG. 5 is an explanatory view of a state after 8 ms after the start-up following FIG. 4 showing the airbag apparatus.
(a) is a sectional view corresponding to II in FIG. 1 (b).
FIG. 6 (b) is a perspective view of the seat. FIG. 6 is a perspective view in which a part of the airbag and the inflator is cut out, showing a folded state of the embodiment of the airbag of the present invention.
[Explanation of symbols]
10 seats
12 back
15 compartment
16 Door trim constituting the side wall
17 Pillar garnish constituting the side wall
25 compartment
30 airbags
31 Airbag device
33 Inflator
36 Gas introduction part
37 Expansion part
40 Cleavage
41 Guide
42 Meeting part
51 First arm
52 Second arm part A Crew E Vertical direction as a predetermined direction F Forward direction as one direction

Claims (4)

An inflatable portion that is folded into a substantially columnar shape having a predetermined direction as a longitudinal direction and inflates and expands in a plane in a direction intersecting with the predetermined direction when gas is introduced, and the inflatable portion is set to the inflatable portion with the predetermined direction as a longitudinal direction. A gas introduction section,
A collective part folded including the inflating part;
A guide part that is folded to include the expansion part that communicates with the gas introduction part, and that is disposed so as to surround both sides along the longitudinal direction of the assembly part,
The guide section is folded in communication with the gas introduction section and is arranged on one side of the assembly section, and is sequentially folded in communication with the first arm section, and is folded in addition to the assembly section. A second arm portion arranged on the side,
The gathering portion is folded in communication with the second arm portion;
When gas is introduced from the gas introduction part, the airbag is deployed in the order of the first arm part, the second arm part, and the collecting part. Collecting portion has claim 1 Symbol placement airbag, characterized in that folded into a roll. An airbag according to claim 1 or 2 , and
An inflator for supplying gas disposed in a gas introduction part of the airbag;
An airbag device comprising: a housing portion that houses the airbag and the inflator and includes a tearable portion that can be torn. The airbag device according to claim 3 , wherein the storage portion is provided on a back portion of the seat, and the airbag is inflated and deployed between a passenger seated in the seat and a side wall portion of the passenger compartment.

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