JP2000190797A - Air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag that is manufacturable with great cutting efficiency of sheet material even while it uses two inflation restriction members. SOLUTION: An air bag 21 comprises a vehicle-body-side foundation cloth 22 having an opening 22a via which an inflater is inserted, an occupant-side foundation cloth 23 which has a ceiling portion 23a opposed to the opening 22a and whose circumferential edge is sewn on that of the body-side foundation cloth 22, and two inflation restriction members 24 interconnecting the edge of the opening 22a of the body-side foundation cloth 22 and the ceiling portion 23a of the occupant-side foundation cloth 23. The air bag 21 has two inside cloth pieces 25 having a base and one leg 25d extending from it. The bases of the inside cloth pieces 25 are placed one on the other and sewn to the edge of the opening 22a of the body-side foundation cloth 22, while the legs 25d are sewn as the inflation restriction members 24 to the ceiling portion 23a of the occupant-side foundation cloth 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag which is housed in an airbag device mounted on a vehicle and is inflated at the time of operation. More particularly, the invention relates to a base fabric having an opening for inserting an inflator, and an opening. The present invention relates to an airbag manufactured by suturing outer peripheral edges of an occupant-side base fabric having a ceiling portion facing the airbag portion.

[0002]

2. Description of the Related Art Conventionally, an airbag of an airbag device has been formed in a bag shape having an opening through which an inflator is inserted, as known in Japanese Patent Application Laid-Open No. 7-149197. (See Japanese Patent Application Laid-Open No. 7-149197).

As shown in FIG. 1, the airbag 1 has a vehicle body side fabric 2 having an opening 2a into which an inflator is inserted, and a ceiling 3a opposed to the opening 2a.
And an occupant-side base cloth 3 sewn to the outer peripheral edge of the occupant-side base cloth 2, and an opening 2a of the occupant-side base cloth 2 and a ceiling 3a of the occupant-side base cloth 3 Expansion regulating member 4
And 4. The inflation regulating members 4 regulate the shape of the airbag 1 when inflated.

[0004] In this airbag 1, the inflation restricting member 4.
4 is composed of one inner cloth 5, and this inner cloth 5
As shown in FIG. 2, it was configured to include a base 5 a arranged on the periphery of the opening 2 a and two legs 5 d and 5 e extending outward from a symmetric position of the base 5 a. The inner cloth 5 uses the suture thread 8 to sew the base 5a to the periphery of the opening 2a of the vehicle body-side base cloth 2 and to sew the legs 5d and 5e to the ceiling 3a of the occupant-side base cloth 3. And the leg 5d
5e constituted the expansion restricting members 4.

The temperature of the inflation gas flowing into the airbag 1 is high around the opening 2a of the vehicle body-side base fabric 2,
In order to improve the heat resistance of the vehicle body-side base cloth 2, three reinforcing cloths 6 are sewn together with the base part 5a so that a plurality of sheets, for example, about four sheets are stacked.

Further, a plurality of mounting holes 2b for mounting the airbag 1 to the airbag device are formed in the periphery of the opening 2a of the vehicle body-side base cloth 2. These mounting holes 2
b communicates with mounting holes 5c and 6b provided on the periphery of the base 5a and the openings 5b and 6a of the reinforcing cloth 6, respectively.

Further, two vent holes 2c are formed in the vehicle body-side base cloth 2 for letting an excess amount of the inflation gas escape.
Had been sutured.

The manufacturing process of the airbag 1 will be described below. First, a sheet material made of a woven fabric such as a polyester yarn or a polyamide yarn having heat resistance is used to form openings 2a, 5b,.
6a, 7a, the mounting holes 2b, 5c, 6b, and the vent holes 2c are not provided, and the vehicle body / occupant side base fabric 2
3. Cut out and prepare the inner cloth 5 and the reinforcing cloths 6 and 7.

Using the suture thread 8, the inner cloth 5 is disposed at the position of the opening 2 a in the cut body-side base cloth 2.
The base 5a and the reinforcing cloth 6, 6, 6 are arranged and sewn,
Further, the vent holes 2c and 2
Using the suture thread 8, the reinforcing cloth 7 is arranged and sewn at the position of arrangement c.

Next, an opening 2a, a mounting hole 2b, and a vent hole 2c, 2c are formed in the body-side base cloth 2 together with the reinforcing cloth 6, 6, 6, 7, 7 and the base 5a of the inner cloth 5. Processed and provided. At this time, openings 6a and 5b and mounting holes 5c and 6b communicating with the openings 2a and the mounting holes 2b of the vehicle body-side base cloth 2 are formed in the base 5a of the reinforcing cloths 6,6,6 and the inner cloth 5. The reinforcing cloth 7.7 has a vent hole 2 of the vehicle body side base cloth 2.
An opening 7a communicating with c is formed.

Thereafter, the outer peripheral surfaces of the body-side base cloth 2 and the occupant-side base cloth 3 are aligned with each other on the outer peripheral side of the airbag 1 so that the outer peripheral edges of the body-side base cloth 2 and the occupant-side base cloth 3 are mutually aligned. The opening 2a is stitched so that the seam allowance is not displayed on the outer peripheral surface side.
5b and 6a, turn over, and then sew the legs 5d and 5e of the inner cloth 5 to the ceiling 3a of the occupant's side base cloth 3 exposed from the opening 2a in a state where the inner cloth 5 is spread flat. Bag 1 was being manufactured.

However, in such an airbag 1, the inner cloth 5 is formed by the two leg portions 5 constituting the inflation restricting members 4.
Since it is long with d · 5e, it requires a large space for cutting from the sheet material.

For this reason, in the conventional airbag, the efficiency of cutting the vehicle body side, the occupant side base cloth, the internal cloth, and the like from the sheet material is poor, and an extra sheet material is required.

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problem, and to provide an airbag which can be manufactured with improved cutting efficiency from a sheet material even if it has two inflation regulating members. With the goal.

[0015]

An airbag according to the present invention has a body-side base cloth having an opening through which an inflator is inserted, and a ceiling part facing the opening, and the body-side base cloth is provided. An occupant-side base cloth that is sewn to the outer peripheral edge, and two expansion restricting members that connect an opening rim of the vehicle-body-side base cloth and a ceiling of the occupant-side base cloth. An airbag, comprising: two inner cloths each having a base and one leg extending from the base, wherein each of the inner cloths overlaps the bases with each other to form the body-side base cloth. And the legs are sewn to the ceiling of the occupant-side base fabric.

[0016]

The airbag according to the present invention is constructed by dividing the inner cloth constituting the two inflation restricting members into two pieces for each inflation restricting member, thereby reducing the length of the inner cloth. can do. Further, the two inner cloths are configured such that the bases are overlapped with each other so that the bases are also used as the reinforcing cloth.

Therefore, since the length of the inner cloth is shortened to be used also as the conventional reinforcing cloth, the number of the inner cloth is 2
Even if the number of sheets increases, the degree of freedom of arrangement when cutting from the sheet material in the two inner cloths can be increased, and the cutting efficiency of the inner cloths can be improved together with the body side / occupant side base cloths and the like. .

Further, the two inner cloths are sewn to the base cloth on the vehicle body side so that the base part is also used as the reinforcing cloth, and the legs constituting the expansion restricting member are respectively similarly formed on the occupant side base cloth. Since the airbag can be manufactured only by suturing the cloth, the conventional suturing operation is not increased at all.

Therefore, the airbag according to the present invention can be manufactured with improved cutting efficiency from the sheet material even if it is provided with two inflation regulating members. And since the space which can be cut from the sheet material of one set of airbags can be reduced, the usage amount of sheet materials can be reduced and the manufacturing cost of an airbag can be reduced.

[0020]

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

As shown in FIG. 5, the airbag 21 of the embodiment is housed in an airbag device M disposed above a central boss B of a steering wheel W.

The steering wheel W has a ring portion R gripped during steering and a boss portion B at the center of the ring portion R.
And a plurality of spoke portions S connecting the ring portion R and the boss portion B.

The airbag device M includes an airbag 2
1 and a cover 11 that covers the folded airbag 21
An inflator 16 for supplying an inflation gas to the airbag 21, a bag holder 12 for holding the airbag 21, the cover 11, and the inflator 16, and a backup plate 15 used for holding the cover 11 on the bag holder 12. , Airbag 21 into bag holder 12
, And a retainer 17 used for holding the sheet.

The cover 11 is formed of a synthetic resin such as a thermoplastic elastomer such as olefin or styrene, and has a substantially rectangular cylindrical shape that protrudes downward from the ceiling wall 11a and the lower surface of the periphery of the ceiling wall 11a. And a side wall 11b. The ceiling wall portion 11a is formed with a thin, not-shown breakable portion arranged in a substantially H shape when viewed from above. The side wall portion 11b arranged in the left-right direction of the steering wheel W has a locking hole 11 on the inner peripheral side.
The locking groove 11c provided with d is formed. The side wall 11b disposed in the front-rear direction of the steering wheel W (not shown) is not provided with the locking hole 11d, but is provided with only the locking groove 11c. An insertion groove is provided.

The inflator 16 has a substantially cylindrical main body 16a in which a plurality of gas discharge ports 16b capable of discharging an inflation gas are disposed at an upper portion, and a flange portion 16c protruding from the outer peripheral surface of the main body 16a. It is configured. Each of the bolts 17 (described later) of the retainer 17 is attached to the flange portion 16c.
a through holes (not shown) through which the holes a are inserted.

The bag holder 12 is made of sheet metal and has a rectangular plate-shaped bottom wall 13 and a side wall 14 extending upward from the periphery of the bottom wall 13. Bottom wall 1
3, an insertion hole 13a is formed at the center, through which the main body 16a of the inflator 16 can be inserted from below.
Each bolt 17a of the retainer 17 is provided on the periphery of the insertion hole 13a.
Through holes (not shown) are formed to pass through the holes. At the upper end, the side wall portion 11 of the cover 11
A lock hook 14a for locking the lock hole 11d of the lock groove 11c in FIG. In addition, the side wall part 14 arrange | positioned in the front-back direction of the steering wheel W has
Locking hooks for locking the locking grooves 11c are formed.

The backup plate 15 is made of sheet metal, and extends upward from the front and rear edges of the bottom wall 15a in the form of a rectangular plate.
And a side wall portion that can be inserted into the above-mentioned not-shown insertion groove. In the center of the bottom wall portion 15a, an insertion hole 15b through which the main body 16a of the inflator 16 can be inserted from below is formed. Further, a peripheral edge of the insertion hole 15b is used to allow each bolt 17a of the retainer 17 to pass therethrough. A through hole (not shown) is formed.

The retainer 17 is made of sheet metal and has a substantially rectangular ring shape, and is provided with four bolts 17a projecting downward near four corners.

As shown in FIGS. 3 to 5, the airbag 21 has an opening 22a into which the main body 16a of the inflator 16 is inserted and a vent hole 22c.
And a disk-shaped occupant-side base cloth having a ceiling portion 23a opposed to the opening 22a and having the outer peripheral edge and the outer peripheral edge sewn together. 23 is formed in a substantially spherical bag shape having: The inside of the opening 22a of the vehicle body-side base cloth 22 and the occupant-side base cloth 2
Two expansion restricting members 24 connecting the third ceiling portion 23a
24 are provided.

In the embodiment, each expansion regulating member 2
4 and 24 are each formed by one inner cloth 25. Each of the inner cloths 25 includes a disk-shaped base 25a and legs 25d, each of which extends from the base 25a and constitutes the expansion restricting member 24. Each of these inner cloths 25 has a base part 25a,
26 along with the periphery of the opening 22a of the vehicle body-side base cloth 22 and the legs 25d.
3 is sewn to the ceiling 23a.

It should be noted that the airbag 21 has
A plurality of sheets (in the embodiment, 2
Disc-shaped reinforcing cloths 26 are sewn, and the disc-shaped reinforcing cloth 27 is sewn to the periphery of the vent holes 22c. These reinforcing cloths 26
27 and the base portion 25a of the inner cloth 25,
The openings 26a, 27a and 25b communicating with the openings 22a and the vent holes 22c are formed.

Further, the opening 22 of the vehicle body side base cloth 22
A mounting hole 22b through which each bolt 17a of the retainer 17 is inserted is formed in the peripheral edge of a, and these mounting holes 22b are
Mounting holes 2 also provided on the inner cloth 25 and the reinforcing cloth 26
5c and 26b.

As shown in FIG. 6, the body-side base cloth 22, the occupant-side base cloth 23, the inner cloth 25, and the reinforcing cloths 26 and 27 constituting the airbag 21 are made of polyamide, polyester, or the like. It is formed by cutting a sheet material 20 made of a flexible woven fabric.

The manufacturing process of the airbag 21 according to the embodiment will be described first.
・ 25b ・ 26a ・ 27a, mounting holes 22b ・ 25c ・ 2
6b and a body material for the vehicle body / occupant side base cloth for forming the vehicle body / occupant side base cloths 22/23, the internal cloth 25, and the reinforcing cloths 26/27 without the vent hole 22c. 22P / 23P, the cloth material 25P for the inner cloth, and 26P / 27P for the reinforcing cloth are cut out and prepared. FIG.
Shows a cutaway view for manufacturing three airbags 21 from the sheet material 20. That is, in FIG.
Three body cloths 22P and 23P for the body side and occupant side base cloths,
And a cloth material 25P for the inner cloth and a cloth material 2 for the reinforcing cloth of 6 pieces each.
A cutaway view of cutting 6P and 27P is shown. Further, the inner cloth material 25P is cut in the bias direction of the sheet material 20 because the portion of the leg portion 25d needs to be stretched.

Then, the cut fabric material 22P for the vehicle body side base cloth is cut.
The base portion 25a of the two inner cloth materials 25P and the two reinforcing cloth materials 26P are arranged and sewn at the arrangement position of the opening 22a in FIG. Vent holes 22c in the body side fabric 22P
Using the suture thread 28, the reinforcing cloth material 27P is arranged and sewn at the arrangement position of 22c. In addition,
The cloth material 25P for the inner cloth 25P
It is arranged and sutured so that the 5d side projects to the opposite side.

Next, the reinforcing cloth material 26P, 26P-2
Base 25 of 7P / 27P or cloth material 25P / 25P for internal cloth
a · 25a, the opening 22 is formed in the body side fabric 22P.
a, mounting holes 22b, and vent holes 22c
Is provided by drilling. At this time, the reinforcing cloth material 26
Base 25a of P.26P or cloth material 25P for internal cloth 25P
The openings 26a and 25b and the mounting holes 25c which communicate with the opening 22a and the mounting holes 22b of the vehicle body side base cloth 22, respectively.
26b are formed, and the reinforcing cloth material 27P
An opening 27a communicating with the vent hole 22c of the vehicle body-side base cloth 22 is formed in P.

Thereafter, the body-side base fabric 22 and the occupant-side base fabric 23, which are formed into a predetermined shape, are joined to each other on the outer peripheral surface side of the airbag 11, so that the body-side base fabric 22 and the occupant-side base fabric are combined. The outer peripheral edge of the inner cloth 25 is turned over using the openings 22a, 25b, and 26a so that the seam allowance is not displayed on the outer peripheral surface side.
The airbag 11 can be manufactured by suturing the 5d and 25d to the ceiling 23a of the occupant-side base fabric 23 exposed from the opening 22a in a flat deployed state.

Then, assembling of the airbag apparatus M will be described. First, each of the mounting holes 22b, 25c, 26b
After the retainer 17 is inserted into the airbag 21 through the opening 22a so that the bolt 17a protrudes from the airbag 21, the airbag 21 is folded. Next, the folded airbag 21 is disposed on the bottom wall 13 of the bag holder 12, the bolts 17a are projected downward from a through hole (not shown) of the bottom wall 13, and the cover 11 is fitted from above. The locking hooks 14a are locked in the locking grooves 11c, and the predetermined locking hooks 14a are inserted into the locking holes 11d.
Thereafter, the side wall portion (not shown) of the backup plate 15 is inserted into the insertion groove (not shown) of the cover side wall portion 11b, and each bolt 17a is projected downward from the through hole b (not shown) of the bottom wall portion 15a of the backup plate. Then, the body 16a of the inflator 16 is inserted into the backup plate 15 or the insertion hole 15b of the bag holder 12.
・ Insert the bolt 17
The airbag device M can be assembled by projecting a from the through hole (not shown) of the inflator flange portion 16c and screwing the nut 18 to each bolt 17a.

In the airbag device M assembled in this manner, the airbag device M is attached to the steering wheel W using the nut 14b provided on the bag holder 12. When the steering wheel W is mounted on the vehicle and the inflation gas is discharged from the gas discharge port 16b of the inflator body 16a, the folded airbag 21 pushes the ceiling wall portion 11a of the cover 11 to a predetermined position. The portion to be broken is broken, and the ceiling wall portion 11a is further opened, so that the portion expands greatly.

In the airbag 21 of the embodiment,
Inner cloth 25 constituting two expansion regulating members 24
Is divided into two pieces for each expansion regulating member 24, and the length of the inner cloth 25 can be shortened. Further, the two inner cloths 25 are configured so that the bases 25a are overlapped with each other so that the bases 25a can also be used as conventional reinforcing cloths.

For this reason, since the length of the inner cloth 25 is shortened to also be used as the conventional reinforcing cloth, even if the number of the inner cloths 25 is increased to two, the sheet material of the two inner cloths 25 is reduced. Can be increased, and the cutting efficiency of the inner cloth 25 can be improved together with the body-side / occupant-side base cloths 22 and 23 and the like.

The two inner cloths 25 are connected to a base 25a.
Is sewn to the vehicle body-side base cloth 22 for use as a conventional reinforcing cloth, and further, leg portions 25 d
However, since the airbag 11 can be manufactured simply by suturing it to the occupant-side base fabric 23 as in the conventional case, the conventional suturing operation is not increased at all.

Therefore, the airbag 21 of the embodiment can be manufactured with improved efficiency of cutting from the sheet material 20 even if the airbag 21 is provided with two inflation regulating members 24. Since the space that can be cut from the sheet material 20 of one set of airbags 11 can be reduced, the amount of use of the sheet material 20 can be reduced, and the airbag 21 can be reduced.
Manufacturing cost can be reduced.

Incidentally, the length L1 of the sheet material 20 used for manufacturing the three sets of airbags 21 of the embodiment is shown in FIG.
As shown in FIG. 7, the length L0 of the sheet material 10 (having the same width as the sheet material 20) used for manufacturing three sets of conventional airbags 1 may be reduced by about 5%. did it. The length L1 · L of the sheet material 20/10
In the range of 0, the cloth materials 2P, 3P, 22P, for the body-side and occupant-side base cloths that can be used directly for manufacturing the airbags 1, 21
23P, the ratio of the area of the inner cloth material 5P / 25P and the reinforcing cloth material 6P / 7P / 26P / 27P, that is, the yield is 81% in the case of the embodiment and 77% in the conventional example.
%, The airbag 11 of the embodiment is
Can be used short and without waste.

[0045] The cloth material 2P
The diameter D1 of the 3P / 22P / 23P is 772 mm, the diameter D2 of the reinforcing cloth 6P / 26P is 205 mm, the diameter D3 of the reinforcing cloth 7P / 27P is 88 mm, and the inner cloth 5P / 25P. The diameter D4 of the bases 5a and 25a is 205
mm, the length L3 of the inner cloth material 5P is 800 mm, the length L4 of the inner cloth material 25P is 502.5 mm, and the width of the legs 5d, 5e, 25d of the inner cloth material 5P, 25P. Dimension B1
Is 90 mm.

In the airbag 21 of the embodiment, the airbag device M accommodated in the steering wheel W is shown. However, the airbag device M for the passenger seat arranged on the instrument panel, The airbag of the present invention can be applied to a side collision airbag device arranged on a seat or a door.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of an airbag showing a conventional example.

FIG. 2 is an exploded perspective view of a conventional airbag.

FIG. 3 is a schematic longitudinal sectional view of an airbag according to one embodiment of the present invention.

FIG. 4 is an exploded perspective view of the airbag of the embodiment.

FIG. 5 is a schematic cross-sectional view showing a use mode of the airbag device in which the airbag of the embodiment is stored.

FIG. 6 is a cutaway view of the airbag of the embodiment.

FIG. 7 is a cutaway view of a conventional airbag.

[Explanation of symbols]

 1, 21 ... airbag, 2.22 ... body side base cloth, 2a, 22a ... opening, 3.23 ... occupant side base cloth, 3a, 23a ... ceiling, 4.24 ... inflation regulating member, 5.25 ... internal cloth, 5a, 25a ... base, 5d, 5e, 25d ... legs, 10/20 ... sheet material, 16 ... inflator, M ... airbag device, W ... steering wheel.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshinari Takei 1 Ochiai Nagahata, Kasuga-machi, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. No. 1 Toyoda Gosei Co., Ltd. F-term (reference) 3D054 AA02 AA03 AA13 AA14 AA17 AA21 CC11 CC15 CC30 CC34 CC41 CC42 CC43 DD11 EE20 FF01 FF17 FF20

Claims (1)

[Claims] 1. An occupant-side base cloth having an opening into which an inflator is inserted, and an occupant-side base cloth having a ceiling facing the opening and sewn the outer peripheral edge to the body-side base cloth. An airbag comprising: an inflation restricting member that connects an opening edge of the vehicle body-side base cloth and a ceiling part of the occupant-side base cloth, the base being extended from the base. And two inner cloths each having one leg, wherein each of the inner cloths overlaps the base portion and sews the base portion to a periphery of an opening of the vehicle body-side base cloth, and Is sewn to a ceiling portion of the occupant-side base fabric.