JP2002347561A - Air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembling workability in an air bag device having a diffuser stored in the air bag. SOLUTION: The air bag device 10 is provided with an inflator 12, an air bag 14 to be expanded with gas charged by the inflator to protect occupants in a vehicle, and a cylindrical diffuser 16 having an opening to store the inflator at least at one end side and gas ejecting ports 26 at its peripheral face. The air bag 14 has an inserting port 52 in the mounting end part 34 of the inflator 12, and an opening part 54 at both side walls. The diffuser 16 is inserted into the air bag 14 through the inserting port 52, to expose the both ends of the diffuser to the outside through the opening part 54 and to stitch 66 the inserting port 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device.

[0002]

2. Description of the Related Art Conventionally, an airbag device which accommodates an inflator in an airbag and protects an occupant by inflating and deploying the airbag with gas emitted from the inflator in response to a control signal. There is. Further, in the airbag device, a cylindrical diffuser surrounding the peripheral surface of the inflator may be provided. The diffuser is a rectifying member for controlling the flow of gas blown out from the inflator and supplying it to the airbag.When the diffuser is provided in the airbag device, it needs to be housed inside the airbag together with the inflator. The problem is whether to place the diffuser in the airbag.

[0003] The present invention has been made in view of the above, and an object of the present invention is to provide an airbag device having a diffuser housed in an airbag, which is excellent in workability in assembling.

[0004]

An airbag device according to the present invention comprises an inflator, an airbag inflated by gas generated by the inflator to protect an occupant of a vehicle, and an opening for accommodating the inflator on at least one end. And a cylindrical diffuser having a gas outlet on the peripheral surface thereof, wherein the airbag has an insertion port at a mounting end of the inflator, and has openings on both side walls. The diffuser is inserted into the airbag through the insertion opening, both ends of the diffuser are exposed outside the opening, and the insertion opening is sewn.

In this airbag device, the inflator is inserted into the diffuser through the opening at the end of the diffuser that is exposed to the outside from the opening at both side walls of the airbag.
As a result, the inflator is arranged in the airbag while being housed in the diffuser. When gas is emitted from the inflator in response to the control signal, the gas is supplied into the airbag from the gas outlet on the peripheral surface of the diffuser, and the airbag is inflated and deployed.

According to the airbag device of the present invention, the insertion opening of the diffuser is set in the airbag, and after the diffuser is inserted, the insertion opening is sewn and closed. Can be improved.

Further, since the opening of the airbag provided for inserting the inflator can be set smaller than a dimension through which the diffuser can pass, gas leakage from the airbag can be suppressed. In this regard,
In particular, it is advantageous when a bolt or the like is provided as a fixing protrusion on the peripheral surface of the diffuser.

Further, since both ends of the diffuser are exposed to the outside of the airbag through the opening, the inflator can be easily inserted into the diffuser, and the edge of the opening is prevented from being damaged by gas generated by the inflator. be able to.

[0009] In the airbag device of the present invention, in the suturing of the insertion port, a mouth portion without a seam allowance may be forcibly pulled out so that inner surfaces thereof face each other, and suturing may be performed at the facing portion.

[0010] In the airbag device of the present invention, the stitched portion of the insertion port may be located away from the peripheral surface of the diffuser when the airbag is deployed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an airbag 14 and a diffuser 16 according to the embodiment, and FIG.
FIG. 3 is an exploded perspective view of the airbag device 10 before sewing.

The airbag device 10 is a passenger seat airbag device disposed in an instrument panel in front of a passenger seat, and includes an inflator 12 serving as a gas generator.
And an airbag 14 that is inflated and deployed by the gas generated by the inflator 12 to protect an occupant of the vehicle, a cylindrical diffuser 16 that stores the inflator 12, and a case 18 that stores these.

The inflator 12 has a cylindrical shape, has a disk-shaped flange portion 20 at one end in the axial direction, and has a gas discharge portion 22 having a smaller diameter than the body portion at the other end portion. A bolt 24 is fixed to the tip end surface of the portion 22.

The diffuser 16 has a cylindrical shape that is open at both ends so that the inflator 12 can be housed inside, and has a plurality of gas outlets 26 on the peripheral surface. At the bottom of the diffuser 16, a plurality of bolts 28, which are projections for fixing to the case 18, project downward. In detail, in this embodiment, the diffuser 16 is configured by rolling a metal plate into a roll shape and fixing the diffuser 16 through a bolt 28 in a through-hole provided in a bottom overlapping portion, as shown in FIG. 5. .

The case 18 is a box-shaped container having a rectangular section with a horizontal cross section that opens upward, and has a circular opening 30 for inserting the inflator 12 on at least one side wall.
A bolt hole 32 for the bolt 28 of the diffuser 16 is provided on the bottom surface of the case 18.

The airbag 14 has a substantially inverted quadrangular pyramid shape that spreads in an inversely tapered shape from a mounting end portion 34 of the inflator 12 to a front portion 36 that receives an occupant. Is stored and fixed. Specifically, the airbag 14 is, in this embodiment,
It is constructed by sewing the base cloth shown in FIG. That is,
The base cloth has an upper surface portion 38 and a lower surface portion 40 integrally extending from both upper and lower edges of a front portion 36, and a side cloth portion 44 forming a side surface portion 42 from both left and right edges of the upper surface portion 38 and the lower surface portion 40. , 46 are integrally extended, and the opposite edges of the upper and lower side fabric portions 44, 46 are sewn together to form a horizontal stitch portion 48, and the side fabric portions 44, 46 and the front portion are formed. By forming the vertical stitching portion 50 by suturing the opposing edges of the 36, the bag is configured in the shape of a bag having the above shape.

The airbag 14, as shown in FIG.
An insertion opening 52 for inserting the diffuser 16 is provided in the mounting end 34, and a substantially circular opening 54 is provided on both left and right side walls thereof. Note that reference numeral 56
Indicates a vent hole provided in the side surface portion 42.

The insertion opening 52 is formed by not sewing the upper and lower edges of the base cloth shown in FIG. 2 when the airbag 14 is sewn, and there is no sewing allowance at the mouth.

The opening 54 is provided in the side surface portion 42, specifically, the side surface cloth portion 46 extending from the lower surface portion 40. Also, as shown in FIG. 3, the opening 54 is fitted so that the end of the diffuser 16 fits tightly inside the opening 54, and the opening edge is held in a state of being in close contact with the outer peripheral surface of the end of the diffuser 16. The opening circumference is diffuser 16
The length is set to be the same as or slightly smaller than the outer peripheral length of the end.

The mounting end 34 has a diffuser 16
A plurality of bolt holes 58 into which the bolts 28 are inserted are provided. The bolt hole 58 is provided at a position displaced from the insertion port 52 toward the lower surface portion 40, and is provided between the left and right openings 54 as shown in FIG.

To reinforce the bolt holes 58 and the openings 54, a plurality of reinforcing cloths 60, 62, 64 are sewn to the mounting end 34. More specifically, as shown in FIG. 4, a first reinforcing cloth 60 sewn on the outer surface side of the airbag 14, and second and third reinforcements sewn on the inner surface side of the airbag 14. The third reinforcing cloth 64, which is made of cloths 62 and 64 and is sewn on the innermost side,
Extending to the edge of the opening.

When assembling the airbag device 10 of this embodiment, the fabric shown in FIG. 2 is sewn into the bag shape shown in FIG. I do. When inserting, diffuser 1
Insert 6 at an angle. And diffuser 1
6 is passed through the bolt hole 58, and both ends in the axial direction of the diffuser 16 are inserted through the opening 54 into the airbag 1.
4 and the insertion opening 52 is closed by sewing.

This suturing is performed by forcibly pulling out the mouth portion without a seam allowance, making the inner surfaces thereof face each other, placing the inner surface on a flat surface, and sewing the facing portion. As shown in FIG. 4, the sewn portions 66 sewn in this manner are sewn together with the third reinforcing cloth 64, and the number of overlapping portions of the sewn portions 66 is increased, so that the strength is increased. It is planned.

As shown in FIG. 5, the suturing portion 66 of the insertion opening 52 is set so as to be located above the diffuser 16 when the airbag 14 is deployed (state). In the embodiment, the suturing portion 66 is set at a position such that the suturing portion 66 protrudes outward from the upper surface of the case 18.

After the insertion opening 52 is sewn as described above, the bolt 28 is inserted into the bolt hole 32 of the case 18 in order to fix the diffuser 16 to the case 18 together with the airbag 14 as shown in FIG. Fastened at 68. Thus, the opening at the end of the diffuser 16 coincides with the opening 30 on the side wall of the case 18. Thereafter, the inflator 12 is inserted from the opening 30 in one side wall of the case 18 to thereby move the inflator 12 to the diffuser 1.
6 and the other side wall of the case 18
By tightening 4 with a nut (not shown), the inflator 12 is arranged in the airbag 14 in a state of being housed in the diffuser 16.

In the airbag device 10 according to the present embodiment, the insertion opening 52 of the diffuser 16 is set in the airbag 14, and the insertion opening 52 is sewn and closed after insertion. The workability of assembling the airbag device 10 is excellent. In addition, the opening 54 of the airbag 14 provided for inserting the inflator 12 can be set smaller than a dimension through which the diffuser 16 in which the bolt 28 protrudes can pass. That is, as described above, the opening edge of the opening 54 can be kept in close contact with the outer peripheral surface of the end of the diffuser 16, so that gas leakage from the opening 54 can be suppressed.

Further, since both ends of the diffuser 16 are exposed to the outside of the airbag 14 through the opening 54 so as to hold the edge of the opening 54 at the outer peripheral surface thereof, the inflator 12 is inserted into the diffuser 16. At the time of insertion, the opening edge of the airbag 14 does not become an obstacle, and therefore, it is easy to insert. Also, since the opening edge of the opening 54 does not exist inside the diffuser 16, the inflator 1
It is possible to prevent the bag from being damaged by the gas generated by the gas.

[0029]

According to the airbag device of the present invention, the diffuser insertion port is set in the airbag,
The workability of assembling the airbag device can be improved, and the opening of the airbag provided for inserting the inflator can be set smaller than the dimension through which the diffuser can pass. Leakage can be suppressed. Further, since both ends of the diffuser are exposed to the outside of the airbag from the opening, the inflator can be easily inserted into the diffuser, and the edge of the opening can be prevented from being damaged by gas generated by the inflator. .

Further, it is not necessary to set the sewing allowance in advance, and the size of the bag member for the sewing allowance can be reduced, so that the material cost can be reduced, and as a result, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an airbag and a diffuser according to an embodiment of the present invention.

FIG. 2 is a development view of the airbag before sewing.

FIG. 3 is an exploded perspective view of the airbag device of the embodiment.

FIG. 4 is a sectional view of a mounting end of the airbag.

FIG. 5 is a sectional view of the airbag device.

[Explanation of symbols]

 10 airbag device 12 inflator 14 airbag 16 diffuser 26 gas outlet 34 mounting end 52 insertion opening 54 opening 66 sewn

(72) Inventor Takashi Sasaki 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka Toyo Tire & Rubber Co., Ltd. (72) Inventor Yoshinori Mihara 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka Toyo Rubber industry F term (reference) 3D054 AA03 AA07 AA14 CC30 DD15 DD40 EE19 FF17

Claims (3)

[Claims] An inflator, an airbag inflated by gas generated by the inflator to protect a vehicle occupant, and a cylindrical shape having at least one opening for accommodating the inflator and having a gas outlet on a peripheral surface. And an airbag device comprising: a diffuser, wherein the airbag has an insertion opening at a mounting end of the inflator, and has openings on both side walls, and the diffuser is inserted into the airbag from the insertion opening. An airbag device wherein the airbag device is inserted, both ends thereof are exposed to the outside of the opening, and the insertion opening is sewn. 2. The sewing apparatus according to claim 1, wherein, in the suturing of the insertion port, a mouth portion without a seam allowance is forcibly pulled out, the inner surfaces thereof are opposed to each other, and the suturing is performed at the facing portion. Airbag device. 3. The airbag device according to claim 1, wherein a sewn portion of the insertion port is located away from a peripheral surface of the diffuser when the airbag is deployed.