JP4156121B2 - Airbag device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an airbag device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an airbag device includes a retainer, an inflator and an airbag accommodated in the retainer, and a lid that is a lid that closes an opening of the retainer. For example, in the case of an airbag for a passenger seat, the retainer is embedded and installed in an instrument panel or the like on the front part of the vehicle interior. In the case of an airbag for a driver seat, the retainer is placed in the center of the handlebar. Embedded in the department. The inflator is a gas generator for inflating the air bag by filling the air bag with a gas. The inflator is formed in a cylindrical shape, and a gas jet is formed on the outer periphery thereof. The air bag has a bag-shaped bag body that inflates when supplied with gas from the inflator, and a gas introduction port leading to the inflator communicates with the bag body.
[0003]
Such an airbag device relieves an impact caused by an occupant colliding with an interior part on the front surface of the occupant at the time of a vehicle collision or the like. In other words, the bag body stored in a folded state in the retainer opens the lid with the gas generated by the inflator and inflates and deploys rearward to form an air bag filled with gas between the occupant and the indoor part. Thus, the occupant's body is received.
[0004]
In the case of an airbag device for a passenger seat, the distance between the occupant and the part such as the instrument panel where the airbag device can be installed is farther than the driver's seat side, so the airbag deployment speed is increased. In order to protect the occupant, the airbag is inflated and deployed linearly toward the occupant.
[0005]
[Problems to be solved by the invention]
In the airbag apparatus as described above, the airbag has a behavior that is influenced by its folded shape, the flow of gas from the inflator, etc. from when the lid is opened until the deployment is completed until the deployment is completed. Since the deployment is shown, it is not always easy to control the deployment behavior. In addition, passengers in the passenger seat are often seated in various postures compared to the driver. For this reason, when the airbag is activated at the time of a vehicle collision or the like, when the occupant is not seated at the normal position, the airbag that is inflated and deployed linearly toward the occupant directly hits the occupant's face or the occupant's chest May be pressed rapidly. In addition, the airbag may inflate and deploy in a direction contrary to expectations, and the windshield may be directly hit and damaged.
[0006]
The present invention has been proposed to deal with the situation as described above, and reduces the deployment speed in the direction of linear deployment toward the occupant and regulates the direction in which the airbag protrudes, The purpose is to reduce the impact on passengers.
In addition, another object is to improve the assembly workability of the airbag device and protect the bag body.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a retainer attached to the vehicle body side, an inflator that is a gas generator housed in the retainer, and a supply of gas from the inflator housed in the retainer. A bag-shaped bag body that is inflated, and a sheet member that is mounted in a state of being folded in a U-shape at a substantially central portion in the longitudinal direction by fixing an end in the retainer, and covers the outside of the bag body; In an airbag device comprising:
Upper carboxymethyl over preparative member between the fixed end side and the folded portion, together with the stitching portion of sewn toward the widthwise direction opposed to each other are provided at least one, close to the folded portion A cut line directed in the short direction is formed between the stitched portion and the folded portion .
[0010]
According to the above invention, when the bag main body pops out of the retainer during the operation of the airbag, first, linear inflating and deployment toward the passenger of the bag main body is restricted by the stitching portion formed in the intermediate portion of the seat member. . That is, the energy absorption required to break the stitched portion of the seat member decelerates the linear bag deployment and promotes lateral deployment. Further, as the bag unfolds, the above-mentioned sheet member is stretched in an arm shape, the sheet member is broken along the cut formed in the sheet member, and the bag body bulges from the portion where the cut is formed. To do.
[0011]
According to this, it is possible to adjust the initial speed of the bag deployment by adjusting the strength of the above-described stitching portion, and it is possible to regulate the protruding direction of the bag body depending on the formation position of the cut. Therefore, at the initial stage of bag deployment, linear deployment toward the occupant is prevented, deployment on both the left and right sides is promoted, impact to the occupant is reduced, and rapid bag deployment to protect the occupant is possible. To do. Furthermore, since the deployment direction of the bag body can be regulated, damage to the windshield due to the direct hit of the bag can be avoided.
[0012]
And since the sheet | seat member fractured | ruptured by bag expansion | deployment covers opening end parts, such as an instrument panel formed when the bag swells, the bag main body expand | deployed by the hooking to the fracture surface, etc. of this opening end part To prevent damage.
[0013]
In addition, in the state where the bag body is stored in the retainer, the seat member covers the periphery of the bag body and holds the bag in the stored state, so that the workability when assembling the airbag device at a predetermined position in the vehicle is improved. At the same time, the bag body can be protected.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a place where the airbag apparatus of the present invention is installed in a passenger compartment. When the airbag apparatus 1 is provided, for example, on the passenger seat side, the airbag apparatus 1 is installed in the instrument panel on the front part of the passenger compartment. In addition, when it is provided on the driver's seat side, it may be installed in the steering wheel and further provided in both the passenger seat and the driver's seat.
[0015]
FIG. 2 is a perspective view showing an appearance of the airbag apparatus according to one embodiment of the present invention, and FIG.
2 and 3, as a component of the airbag apparatus 1, 11 is a lid, 12 is a bag body, 13 is an inflator, 14 is a retainer, and 15 is a seat member. The lid 11 forms a lid that closes the opening of the retainer 14, and a lip line 11 a that is formed thin is formed at the center. The retainer 14 accommodates the folded bag main body 12 and the cylindrical inflator 13, and forms the housing of the airbag apparatus for embedding in an instrument panel etc. As shown in FIG. The inflator 13 is a gas generator using a compressed gas mainly composed of argon and explosives, and the compressed gas outlet thereof communicates with the gas inlet of the bag body 12.
[0016]
Then, in the retainer inside 14a, a rectangular sheet member 15 formed with a stitched portion or a cut is mounted with one side above the bag body 12 and the opposite side below the bag body 12, and the bag body 12 It is arrange | positioned so that it may cover. Here, the material of the sheet member 15 can be a cloth or a flexible synthetic resin sheet.
FIG. 4 shows an embodiment of the sheet member 15. The seat member 15 has a rectangular shape, and mounting holes 15a are formed at both ends thereof. One side of the seat member 15 is mounted above the bag body 12, and the other end is mounted below the bag body 12. And, in parallel with the edge of the sheet member 15, a stitching portion 15b is formed so that a part of the sheet member 15 is overlapped on the intermediate portion, and further, at a desired set position on the center side from the stitching portion 15b, A cut 15c is formed in parallel with the end side.
[0017]
The operation of the above-described embodiment will be described with reference to FIGS. FIG. 2A shows a state at the beginning of deployment of the airbag. The basic operation of the airbag device 1 is the same as the conventional one. That is, when the vehicle collides, the sensor detects a sudden deceleration of the vehicle, and the compressed gas is ejected from the gas ejection port of the inflator 13. And the expansion | deployment expansion | deployment of the bag main body 12 is started by the gas which flowed in in the bag main body 12, and the lid 11 is cracked and opened from the thin lip line 11a by the pressure.
[0018]
FIG. 5B shows a state in which the development of the bag body 12 is slightly advanced. At the beginning of the deployment of the bag body 12, the deployment is first restricted by the stitched portion 15b of the seat member 15, and the deployment is temporarily promoted in the left-right direction. And the deployment speed of the linear direction which goes directly to a passenger | crew reduces by the deployment energy absorbed by breaking the stitching part 15b. When the stitching portion 15b is broken, the bag main body 12 is further expanded to put the seat member 15 in a tension state. At this time, the lid 11 is broken and completely opened up and down.
[0019]
Then, as shown in FIG. 5 (c), by the deployment pressure of the bag body 12, breakage from the sheet member 15 Re switching eyes 15c, deployment of the bag body 12 from the broken portion of the switching Re eye 15c proceeds further. Therefore, the switching Re eye 15c to be formed on the sheet member 15 by forming the desired position, it is possible to regulate the direction flying out of the bag.
[0020]
FIG.5 (d) shows the state which the bag main body 12 expand | deployed completely. At this time, the broken sheet member 15 covers the opening end of the lid 11 opened up and down, thereby preventing the bag body 12 from being caught by the opening end of the lid 11 and being damaged.
[0021]
FIG. 6 shows another embodiment of the sheet member 15 (the same parts as those in the above-described embodiment are denoted by the same reference numerals and the description thereof is omitted). In the example of FIG. 6, a plurality of (two) stitching portions 15b in the example of FIG. 4 are formed, whereby the deployment speed of the bag body 12 in the linear deployment direction can be further reduced.
[0022]
According to the above-described real施例, upon airbag deployment, the bag body 12 jumps out from the retainer 14, first, the stitching portion 15b formed at an intermediate portion of the sheet member 15, towards the occupant of the bag body 12 linearly Inflating and expansion is regulated, linear bag expansion is decelerated, and lateral expansion is promoted. Furthermore, the bag expansion progresses, the sheet member 15 is broken along the cut line 15 c formed in the sheet member 15, the bag body 12 is bulged therefrom.
[0023]
According to this, it is possible to adjust the initial speed of the bag deployment by adjusting the strength of the above-described stitching portion 15b, and it is possible to regulate the protruding direction of the bag body 12 by the formation position of the cut 15c. Therefore, at the initial stage of bag deployment, linear deployment toward the occupant is prevented, deployment to the left and right sides is promoted, impact to the occupant is reduced, and rapid bag deployment to protect the occupant is possible. To do. Furthermore, since the deployment direction of the bag body 12 can be regulated, damage to the windshield due to the direct hit of the bag can be avoided.
[0024]
And since the sheet | seat member 15 fractured | ruptured by bag expansion | deployment covers the opening edge part formed when the bag swells, the bag main body 12 expand | deployed by the hooking to the fracture surface of this opening edge part etc. will be damaged. To prevent.
[0025]
When the bag body 12 is stored in the retainer 14, the seat member 15 covers the periphery of the bag body 12 and maintains the bag storage state. Therefore, when assembling the airbag apparatus 1 at a predetermined position in the vehicle In this case, the bag body 12 can be protected.
[0026]
【The invention's effect】
Since the present invention is configured as described above, it is possible to reduce the deployment speed in the direction of linear deployment toward the occupant, and to regulate the direction in which the airbag pops out to alleviate the impact on the occupant. . In addition, the assembling workability of the airbag device can be improved and the bag body can be protected.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an installation place of an airbag apparatus according to the present invention.
FIG. 2 is a perspective view showing an appearance of an airbag apparatus according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of an airbag device according to an embodiment of the present invention.
FIG. 4 is an explanatory view showing an example of a sheet member in one embodiment of the present invention.
FIG. 5 is an explanatory diagram showing the operation of the embodiment.
FIG. 6 is an explanatory view showing an example of a sheet member in one embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air bag apparatus 11 Lid 12 Bag main body 13 Inflator 14 Retainer 15 Sheet | seat member 15a Attachment hole 15b, 15d Sewing part 15c Cut | interruption

Claims (1)

A retainer attached to the vehicle body, an inflator that is a gas generator housed in the retainer, a bag-shaped bag body that is housed in the retainer and expands upon receiving gas supplied from the inflator, and the retainer In an airbag device comprising: a seat member that is mounted in a state of being folded in a U-shape at a substantially central portion in the longitudinal direction by fixing the end side inside, and that covers the outside of the bag body ,
Upper carboxymethyl over preparative member between the fixed end side and the folded portion, together with the stitching portion of sewn toward the widthwise direction opposed to each other are provided at least one, close to the folded portion The airbag apparatus characterized by forming the cut | interruption which faced the transversal direction between the sewing part and the said folding | returning part .

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