JP3187501B2 - Woven airbag with hanging string - Google Patents

Abstract

PURPOSE:To provide a tubular air bag with a robe-cord which prevents an occupant from being damaged with the initial protrusion by enlarging the air bag which is expanded step by step upon occurrence of collision. CONSTITUTION:A joined and bound one layer structure part is woven in the tubular part 17 of a tubular air bag base cloth 20, and a hole 3 for inflator installation port is cut in a steering wheel side panel 23 with the joined and bound one layer structure part as a center, and a robe-cord 8 is attached by utilizing both the cut pieces 24, 25 of the steering wheel side panel 23. It is thus possible to attach plural robe-cords easily in the tubular air bag, and provide manufacturing cost reduction. This air bag also provides the equivalent bag performance to a sewn type air bag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a woven airbag having excellent performance and capable of producing an airbag at low cost. More specifically, the present invention relates to a woven airbag in which an airbag that is deployed at the same time as a collision expands stepwise, and does not damage an occupant due to initial projection.

[0002]

2. Description of the Related Art The use of an airbag device has been recommended to prevent personal injury due to an automobile collision accident. The airbag device includes a sensor for detecting a collision of an automobile, a gas generator for inflating the bag based on a signal from the sensor, and an airbag for inflating with a gas to absorb a shock of an occupant during a collision. In this airbag, a sewn type airbag formed by sewing a plain woven fabric is widely used, and an airbag using a bag woven fabric having a circular double woven structure is known, for example, from Japanese Patent Laid-Open No. 1-25446. .

Further, in a conventional sewing type air bag, an exhaust hole is provided in a bag-like structure entirely covered with a rubber-based film material to prevent a sudden increase in the internal pressure of the bag at the time of collision, and a gas generator (hereinafter referred to as an inflator). It is instantaneously spread by the hot gas from (noted). However, depending on the occupant's seat position and the collision situation, the occupant may come into contact with the airbag before the airbag is completely deployed. That is, the case where the airbag is stored by the gas generated from the inflator,
It pierced the lids and the like and momentarily protruded and hit the occupant's body, and on the contrary, the occupant was sometimes impacted. Therefore, in a large capacity airbag,
A plurality of suspension strings are provided for the purpose of suppressing initial protrusion and stabilizing the shape at an early stage.

[0004] This hanging string attaching step is a complicated and costly factor in the conventional sewn airbag shown in FIG. That is, in the sewing type airbag for the driver's seat, the air-impermeable cloths 1a and 1b are cut into a circle, the inflator mounting opening 3 and the exhaust holes 4a and 4b are opened in one of the cloths 1b, and the reinforcing cloth 5 is provided for each. , 6a, 6b are fixed by sewing or bonding, and the outer periphery 2 of the cloths 1a, 1b is sewn. The hanging strings 8a and 8b are fixed to the part of the reinforcing cloth 5 at positions 10a and 10b by sewing or bonding with the fixing cloths 7 and 9a and 9b on the cloth 1a side. FIG. 1 shows an airbag produced by this sewing method turned upside down from an inflator mounting opening 3. In this sewing type airbag, sewing or bonding of the fixing cloth 7 and the hanging strings 8a and 8b is complicated, which contributes to an increase in manufacturing cost.

On the other hand, as shown in FIGS. 2 (A) and 2 (B), in an airbag using a bag woven fabric 11 having a circular double woven structure, the woven state by a loom is already in a bag shape. That is, since the inside of the annular bonded single-tissue band 12 is the bag woven portion 13 (14 is the ear tissue portion of the bonded single-tissue, and 15 is the peripheral bag woven portion), it is difficult to attach the fixed cloth and the hanging string. Due to the high manufacturing cost, a woven airbag with a hanging string has not been put to practical use until now.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an airbag having a structure in which a plurality of hanging straps can be easily attached even to an airbag using a double-woven fabric having a double-woven structure. And

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a woven airbag having a woven fabric portion whose peripheral portion is surrounded by a single-piece tissue band, wherein the woven fabric portion is provided with a gas generator mounting hole. A handle having a gas generator mounting hole (3) cut and drilled by cutting a second bonded single tissue portion formed in a plane including a portion to be cut into a cut end piece (24) around the second bonded single tissue portion. The side woven fabric (23) and the cut end piece (2
And a plurality of hanging straps (8), which are formed separately from the bag body and are composed of an occupant-side woven fabric (22) having a bonded single-tissue portion at the center portion including the fourth single-bonded single-tissue portion. This is achieved by a woven airbag with a hanging string, wherein the cut end piece (24) connected to the tissue portion is attached to the bag body as an attachment portion.

That is, when the woven fabric on the handle side of the sack weaving portion is drilled as an inflator (gas generator) mounting hole at a position radially outside the second connection single tissue portion, the hole is formed. Simultaneously with the cutting, a bag constituting the central portion of the woven fabric on the driver's seat side is formed together with the cut end piece formed in connection with the connecting single tissue portion. By using this cut end piece as an attachment shiro (a substitute) for a plurality of hanging strings (prepared separately from the bag body), the sewing operation of the hanging string and attachment to the bag body by adhesion are simplified. The operation becomes easy and a woven airbag with a hanging string can be easily manufactured at a reduced installation cost.

The present invention will be described in detail below with reference to the accompanying drawings showing a preferred example of a woven airbag with a hanging string according to the present invention.
FIG. 3A is a plan view showing an example of a base fabric for a woven airbag with a hanging string according to the present invention, and FIG. 3B is a cross-sectional view taken along line XX of FIG. The woven portion is shown inflated), and FIG. 3C is a cross-sectional view of the woven airbag with a suspending string of the present invention in a state where the suspending string is attached after the inflator attaching hole is provided.

In a woven airbag base fabric 20 with a hanging string shown in FIG. 3 (A), a bonded single-tissue band 1 forming the outer periphery of the woven fabric.
2 is also connected to the central portion of the woven fabric portion 17 inside the single woven fabric portion 16.
Weave a and 16b. The size of the connecting single tissue portion at the central portion must be smaller than the diameter of the inflator attachment opening, and must be large enough to leave the adhesive white portion 24 of the hanging string. The width of the adhesive white portion 24 of this hanging string is 1 cm.
Above, preferably 2 cm or more. The planar shape of the central connecting single tissue portion is not particularly limited, and is preferably a perfect circle. In addition, it is necessary to select a tissue in consideration of the weaving property, the strength of the joint, and the seam deviation as the tissue of the single-bonded tissue portion at the center. In other words, the structure of the central single-part tissue section is
Patent application “Foot weave airbag” filed on November 28, 1990 by the same applicant as the present invention (Japanese Patent Application No. 2-32262).
It is preferable to select the organization invented in 3). Specifically, the central side 16a of the bonded single tissue portion is the tissue of FIG. 4 (A), and the double woven fabric side 16b of the bonded single tissue portion is FIG. 4 (B).
In the above structure, a ring shape having a width of 3 to 5 mm is preferable.

After weaving the airbag fabric 20 shown in FIG. 3 with a Jacquard loom, the fabric is passed through a scouring / setting process. Thereafter, the inflator mounting opening 3 is cut only on the handle-side panel (hereinafter referred to as S-panel) side 23 in accordance with the shape of the inflator with respect to the centrally connected single tissue portion 16b of the airbag base fabric (cut circle; broken line 18). ). The cutting method is preferably performed by a melt cutting method using a laser cutter or the like to prevent the cut surface from fraying. Further, the outer periphery 1 of the single-woven fabric web 12 bonded to the outside of the woven airbag fabric.
By melting and cutting with a laser cutter or the like along 9, a woven airbag 21 can be obtained.

A cut end piece 24 of an occupant side panel (hereinafter referred to as a D panel) and a woven cloth end 25 on the S panel side which are separated by a perforation process for mounting an inflator of the airbag.
By connecting a plurality of hanging strings 8 to the woven fabric by a bonding or sewing method, a woven airbag 21 with hanging strings can be obtained. The number of hanging strings may be selected from those usually used, and may be selected from, for example, 1 to 6 strings. A fixed cloth may be used for connecting the hanging string 8.

Specific materials to be used or fixing methods include, for example, epoxy, polyurethane, isocyanate, polyamide, vinyl acetate, rubber paste, and the like as adhesives.
A hot melt resin, a reaction hot melt resin, or the like is used. In the case of sewing, a normal sewing thread is used. The fixing cloth may be selected from woven fabric, knitted fabric, nonwoven fabric, paper, film, foil, tape, mesh-like material, net-like material, string, or a laminate thereof, and is not particularly limited. The hanging string is
Anything that does not hinder the expansion behavior of the airbag may be used.
For example, a tape-shaped woven fabric, a rope, a braid, a cut fabric of a woven fabric or a knitted fabric, a mixture thereof, or the like may be used.

The shape of the airbag is not particularly limited either, and may be selected according to the intended use, such as circular, spherical, elliptical spherical, square, cylindrical, and other applications. Any for doors etc. may be used. The airbag may be exhausted by any of an exhaust hole type, a base fabric exhaust type, a partial base fabric exhaust type, and a combination type thereof.

[0015]

The present invention will be described below in detail with reference to examples. Example 1 Nylon 66 and 420d / 70f were used for the warp and the weft, respectively, and the density of the woven portion was 46 / inch × 46 / inch, the inner diameter of the woven portion was 720 mm, and the woven airbag had the structure shown in FIG. 3 (A). The base fabric 20 was woven on a Jacquard loom by a folding screen hanging method. At this time, the size of the outer periphery 16b of the centrally bonded single tissue portion of the base fabric 20 for a woven airbag is 40 mm in diameter.
The tissue is located at the center 16 of the bonded single tissue band as shown in FIG.
a is the tissue of FIG. 4 (A), the double woven cloth side 1 of the bonded single tissue band.
Reference numeral 6b denotes a structure shown in FIG. 4B, which has a ring shape with a width of 3 mm. After scouring and setting this woven airbag base fabric 20, D
Impermeable processing was performed only on the panel side 22 with chloroprene rubber.

The inflator mounting opening 3 is adjusted to the size of the inflator with the center portion of the single tissue band bonded to the central portion of the base fabric 20 for a woven airbag in order to prevent the cross section of only the S panel side 23 having a diameter of 100 mm from being frayed. Melt cutting was performed with a laser cutter (cut circle; broken line 18). The hanging string 8 is made of nylon 66, 420d / 70f for the warp and the weft.
A strip-like cloth obtained by cutting a plain-woven base cloth woven in a length of 320 mm and a width of 60 mm was used. This hanging string is attached to the woven airbag 21.
D separated by drilling for mounting the inflator
Four reactive hot melt resins were adhered to the hanging string adhesive white portions 24 on the panel side and the hanging string adhesive white portions 25 on the S panel side. The length of the hanging strap adhesive white portion 24 on the D panel side is 3 on each side.
0 mm. In addition, four reinforcing cloths were adhered to the periphery of the inflator mounting opening 3 with a reactive hot melt resin in the same manner as the hanging string.

The woven airbag 21 was accommodated in an inflator-attached case, and a deployment test was performed. The obtained results showed that there was little initial protrusion, there was no damage to the bag body, there was no problem in the expansion, and the bag performance was not inferior to the conventional sewing airbag with a hanging string. Further, the manufacturing cost of the woven airbag with the hanging string is lower than that of the sewing type airbag with the hanging string.

Comparative Example 1 The sewing-type airbag with a hanging string shown in FIG. 1 has good performance, but the sewing process of attaching the hanging string is complicated, requires many steps, and is expensive.

COMPARATIVE EXAMPLE 2 Although the conventional woven airbag without a suspending string shown in FIG. 2 has no manufacturing process because the step of attaching the suspending string is not required, the initial projection is remarkable in the expansion test using an inflator. There was concern for facial injury.

The production cost and the initial height of the bag of Example 1, Comparative Example 1 and Comparative Example 2 are compared, and the results are shown in Table 1.

[0021]

[Table 1]

[0022]

According to the present invention, there is provided a woven airbag with a hanging string, in which a plurality of hanging strings can be easily mounted even in a woven airbag using a woven cloth with a double woven structure.
The woven airbag with a hanging string of the present invention can form a mounting piece of the hanging string on the driver side fabric by only a simple cutting operation of opening an inflator attachment opening in the woven section, and the hanging string is provided on the driver side. Simple mounting can be achieved through the provided mounting pieces. According to the present invention, it is possible to provide a woven airbag with a hanging string, which is equivalent in performance to a sewing-type airbag with a hanging string, at a lower cost.

[Brief description of the drawings]

FIG. 1 is a view showing how to attach a hanging string of a sewing type airbag according to a conventional technique.

FIG. 2A is a plan view of a conventional woven airbag fabric, and FIG. 2B is a cross-sectional view of the woven airbag fabric shown in FIG. Is)

3 (A) is a plan view showing an example of a base fabric for a hanging woven bag of the present invention, FIG. 3 (B) is a cross-sectional view taken along line XX of FIG. 3 (A), and FIG. 3 (C) is (A) and (A). B) Cross-sectional view of a woven airbag with a hanging string made from the base fabric shown in B)

FIG. 4 (A) is a diagram showing an example of an organization chart of a bonded single tissue section, and FIG. 4 (B) is a view showing another example of an organization chart of a bonded single tissue section.

[Description of Signs] 1a, 1b: Base fabric for airbag 2 ... Stitched portion on outer periphery of airbag 3 ... Inflator attachment port 4a, 4b ... Exhaust hole 5: Reinforcement cloth for inflator attachment port 6a, 6b: Exhaust hole reinforcement cloth 7: Fixing cloth for hanging string 8, 8a, 8b: Hanging string 9a, 9b, 10a, 10b: Fixing cloth for end of hanging string 11 ... Base fabric for airbag 12 ... Single-tissue tissue band 13 ... Bag section 14 ... Ear tissue part of the woven airbag base fabric 15: Peripheral woven cloth part 16a, 16b: Bonded single-tissue part 17: woven cloth part 18: Cutting circle for inflator attachment opening 19: Cutting of the peripheral woven cloth part along the bonded single-tissue band Circle 20: Base cloth for woven airbag 21 ... woven airbag with hanging string 22 ... D panel side (occupant side) 23 ... S panel side (handle side) 24 ... D panel side hanging string adhesive white part 25 ... S panel Side hanging cord adhesive white part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-5145 (JP, A) JP-A-3-197254 (JP, A) JP-A-3-16850 (JP, A) 106953 (JP, U) JP-A-2-117242 (JP, U) Special Table Hei 4-504988 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B60R 21/16

Claims (1)

(57) [Claims] 1. A woven airbag having a woven portion whose peripheral portion is surrounded by a single-layered tissue band, wherein the woven portion is formed in a plane including a portion where a gas generator mounting hole is to be provided. A handle side woven fabric (23) having a gas generator mounting hole (3) cut and drilled with a second bonded single tissue portion forming a cut end piece (24) around its periphery and said cutting; An occupant-side woven fabric (22) having a binding single-tissue portion including an end piece (24) at a central portion thereof, and a plurality of suspension strings (8) separate from the bag body are provided in the second manner. A woven airbag with a hanging string, which is attached to a bag body with a cut end piece (24) connected to a bonded single tissue portion as an attachment portion.