JP3928238B2 - Vehicle airbag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle airbag, and more specifically, an attachment-side base fabric provided with a gas inflow opening, a retainer disposed on an inner peripheral edge of the gas inflow opening, and attached to a bag holding member; The present invention relates to a vehicle airbag formed by stitching the outer peripheral edge of a facing side base fabric facing an attachment side base fabric.
[0002]
Here, a steering wheel airbag will be mainly described as an example of a vehicle airbag. However, the same applies to a passenger airbag.
[0003]
[Background]
2. Description of the Related Art Conventionally, an airbag of the above type has a configuration as shown in FIGS. 1 and 2 (see JP-A-9-263204, etc.).
[0004]
A mounting base fabric 16 provided with a gas inflow opening 17 and a retainer (not shown) disposed on the inner peripheral edge of the gas inflow opening 17 and attached to a bag holding member (not shown); 16 is formed by polymerizing the facing fabric 18 that faces 16 and stitching 20 the outer periphery. Usually, after the stitching, the bag body is inverted.
[0005]
A cloth laminate portion 22 is formed at the inner peripheral edge of the gas inflow opening 17, and the cloth laminate portion 22 is, in the illustrated example, a band-like tether 24 extending in the same direction on the attachment-side base fabric 16. It is the structure which consists of the rectification | straightening cloth 26 and the reinforcement cloth 28 in order.
[0006]
That is, on the mounting panel 12, the base part 24a of the tether 24, the base part 26a of the rectifying cloth 26, and if necessary, the reinforcing cloth 28 having the same diameter as the base part 26a of the rectifying cloth 26 are placed in this order. These are the configurations in which they are sewn together (sewn) 29.
[0007]
Although the retainer is not clearly shown, the diameter of the retainer is substantially the same as the diameter of the lower large diameter portion 12a of the inflator 12.
[0008]
[Problems to be solved by the invention]
However, it has been found that the conventional configuration in which the rectifying cloth is sewn together with the tether has the following problems when the airbag is activated.
[0009]
That is, when the air bag is activated, the sewn portion 29 on the outer peripheral side of the tether base portion 24a is subjected to a tensile impact twice when the rectifying cloth 26 is extended and when the tether 24 is extended. For this reason, in order to prevent the sewing portion 29 from being released from sewing, a large sewing strength (depending on the sewing thread strength, the number of stitches, and the sewing fabric strength) is required for the tether base portion 24a.
[0010]
Moreover, the outer peripheral side attachment part 29 in the tether base part 24a is in a part that directly receives a high-temperature gas (flame) that is ejected from the inflator at the beginning of operation, and has a large thermal effect.
[0011]
In view of the above, an object of the present invention is to provide a vehicle airbag having a small tensile impact and thermal influence on a sewn portion of a tether base portion when the bag is operated.
[0012]
[Means for Solving the Problems]
The vehicle airbag according to the present invention solves the above problems by the following configuration.
[0013]
An outer peripheral edge of an attachment-side base fabric provided with a gas inflow opening and having a retainer disposed on an inner peripheral edge of the gas inflow opening, and attached to the bag holding member, and a facing base fabric facing the attachment-side base cloth sutured together is formed a fabric laminated portion is formed on the periphery of the gas inlet opening in the inner surface of the attachment side base cloth, the fabric laminated portion have respective source portion to the fabric laminate portion A vehicle airbag provided with a tether and a rectifying cloth , each extending in the same direction ,
Wherein the fabric laminated portion including the exception and the tether rectification fabric, retainer length in the direction tether source unit are connected (hereinafter, referred to as "retainer width".) Is sewn to the attachment side base cloth from the outside , the rectifier cloth and tethers, the outside of the retainer width, characterized in that not sewn.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described in detail with reference to FIGS. In addition, about the corresponding part with the above-mentioned example, the figure code | symbol which attached | subjected the prefix numeral "1" to the same figure code | symbol was attached | subjected.
[0015]
(1) The airbag B of the present embodiment includes a gas inflow opening 117, and a retainer 114 is disposed on the inner peripheral edge of the gas inflow opening 117 to be attached to a bag holding member (bag holder) 136. The outer peripheral edge of the base fabric 116 and the facing base fabric 118 facing the attachment side base fabric 116 is formed by sewing 120. In the illustrated example, the inflator 112 is attached together with the airbag B to the bag holder 136 via the flange portion 112a.
[0016]
In addition, the airbag B is configured to be reversed to form a bag body after stitching, but it is not always necessary to reverse the airbag.
[0017]
The base fabrics 116 and 118 are usually made of synthetic fibers such as polyamide and polyester by plain weaving. At this time, if necessary, a heat-treated inside may be used by rubber drawing or the like.
[0018]
(2) In the above-described configuration, the airbag B has a fabric laminated portion 122 formed on the inner side surface of the attachment-side base fabric 116 at the peripheral portion of the gas inflow opening 117, and the fabric laminated portion 122 extends in the same direction. The belt-like tether 124 and the base portions 124a and 126a of the rectifying cloth 126 are provided so that the tether 124 is located on the attachment side base cloth 116 side. In the illustrated example, each of the base portions 124a and 126a has an annular shape, but is not necessarily required when the width of the tether 124 and the rectifying cloth 126 is sufficiently wide. Further, the tether 124 and the rectifying cloth 126 are laminated so that their longitudinal directions are in the left-right direction when viewed from the occupant when the steering wheel is mounted on the steering wheel. Hereinafter, the “left-right direction” is referred to as “wheel left-right direction”, and the direction orthogonal to “wheel left-right direction” is referred to as “wheel up-down direction”.
[0019]
And the cloth lamination | stacking part 122 except the baffle cloth 126 and including the tether 124 is outside the retainer length (hereinafter referred to as “ retainer width”) w in the direction in which the tether base part 124a is connected . The cloth 116 is sewn S1, and the rectifying cloth 126 and the tether 124 are not sewn together outside the retainer width w.
[0020]
That is, in the illustrated example, the base portion 124a of the tether 124 is sewn S1 concentrically with respect to the gas inflow opening 117 outside the retainer width w via the reinforcing cloth 128 on the attachment side base fabric 116. ing. Here, although not necessarily, the peripheral edge of the gas inflow opening 117 of the attachment-side base fabric 116 is also sewn concentrically with the gas inflow opening 117 from a reinforcing viewpoint.
[0021]
A base portion 126a of a rectifying cloth 126 is laminated on the base portion 124a of the tether 124, and a flameproof cloth 130 is further laminated thereon.
[0022]
Here, although not necessarily, the rectifying cloth 126 and the flameproof cloth 130 are temporarily attached to the tether 124 and the attachment-side base cloth 116 in four small circles inside the retainer width w. This is to prevent the rectifying cloth 16 and the flameproof cloth 130 from falling off when the retainer is assembled and when the bag is reversed.
[0023]
In the present embodiment, a reinforcing cloth 128 and a flameproof cloth 130 are provided (not shown in FIG. 5). When the strength of the attachment-side base cloth 116 at the periphery of the gas inflow opening 117 is sufficient, the reinforcing cloth 128 may not be provided. Further, as for the flameproof cloth 130, when the high degree of protection (flameproofing) is not required at the sewing portion S1 that is not covered by the retainer 114 of the tether base portion 124a, the rectifying cloth 126 is flameproofed as described later. Since it also has an effect, it is not inevitable.
[0024]
When manufacturing the airbag, the blank cloths of the attachment-side base fabric 116, the reinforcing fabric 128, the tether 124, the rectifying fabric 126 and the flameproof fabric 130 are sewn and laminated as described above, and the gas inflow opening 117 is formed. It is desirable to form by heat cutting such as leather. Since these blank cloths are made of synthetic fibers such as nylon 6, the periphery of the inflator insertion well is heat-sealed and temporarily fixed. For this reason, it is possible to prevent the rectifying cloth 126 and the flameproof cloth 130 from being rolled up.
[0025]
The rectifying cloth 126 has a ring shape having a circumferential surface in the left-right direction of the wheel by sewing the front ends of the belt-like body in which an annular base 126a is temporarily sewn S3 to the attachment-side base cloth 116. The rectifying cloth 126 covers the upper surface of the inflator 112 and has an effect of guiding the gas ejected from the gas ejection holes 112b of the inflator 112 in the wheel vertical direction.
[0026]
Further, the tether 124 is positioned on the surface side of the rectifying cloth 126, with the ends of the belt-like bodies having the annular base 126 a sewn on the attachment-side base cloth 116 sewn on the facing base cloth 118. The ring shape has a circumferential surface in the left-right direction of the wheel. The tether 124 has an effect of regulating the bulging height of the bag when the airbag is activated.
[0027]
(3) Next, how the airbag is used will be described.
[0028]
First, the retainer 114 is inserted into the gas inflow opening 117, and the bolt 114a attached to the retainer 114 is inserted into the hole 122a penetrating from the flameproof cloth 130 side to the attachment side base cloth 116 and protruded outward. After setting the airbag B, the airbag B is folded on a jig (not shown).
[0029]
Then, the peripheral portion of the gas inflow opening 117 of the airbag B is attached to the bag holder 136 together with the flange portion 112a of the inflator 112 by using the bolt 114a, and the pad 138 and the like are further assembled. Assemble the steering wheel as a module.
[0030]
When the air bag is activated, the high temperature gas (combustion gas) ejected from the inflator 112 first collides with the flow rectifying cloth 126, so that the flow rectifying cloth 126 extends. At this time, the high-temperature gas collides with the flameproof cloth 130 or the rectifying cloth 126, and does not directly hit the base sewn portion S <b> 1 (outside the retainer 114) of the tether 124, and the tether 124 is pulled. Since the outer side of the inflator width w, which is a force receiving portion, is not co-sewn with the rectifying cloth 126, when the rectifying cloth 126 is extended, the original sewn portion S 1 positioned outside the retainer width W of the tether 124 is pulled. I will not receive it.
[0031]
The hot gas is guided by the flow rectifying cloth 126 and flows in the vertical direction of the wheel, and the airbag B quickly swells in the vertical direction of the wheel. At this time, since there is no joint sewing portion with the tether 124 outside the retainer width w of the rectifying cloth 126, a gap A is formed between the rectifying cloth 126 and the tether 124 on both sides of the retainer 114. The thermal effect of the jet gas received by the tether 124 due to the presence of the gap A is further reduced.
[0032]
Further, the airbag bulges out and suddenly protrudes toward the occupant, but the amount of protrusion of the airbag is regulated by the tether 124. At this time, the sewing S1 located outside the retainer 114 in the tether base portion 124a is first subjected to a tensile impact. Therefore, the sewing strength of the sewing S1 at the tether base portion 124a may be smaller than that in the conventional case.
[0033]
[Operation and effect of the invention]
In the vehicle airbag of the present invention, the cloth laminated portion including the tether is excluded from the rectifying cloth, and is sewn to the attachment-side base cloth outside the retainer width, and the rectifying cloth and the tether are outside the retainer width. Due to the non-sewn structure, the following effects are obtained.
[0034]
The high-temperature gas ejected from the inflator first collides with the rectifying cloth and does not directly hit the base sewn portion of the tether. Further, since there is no sewing site outside the width of the retainer cloth retainer, there is a gap between the flow straightener cloth and the tether at the outer periphery of the retainer, and the thermal effect of the gas blown from the inflator received by the tether is further reduced. .
[0035]
Since the sewn portion of the tether base portion located outside the retainer is not co-sewn with the rectifying cloth, it receives a tensile impact for the first time when the tether is extended. Accordingly, the tensile impact acting on the sewn portion of the tether base portion can be reduced as compared with the conventional case.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view showing a bag inflated state in a conventional example of a vehicle airbag. FIG. 2 shows the bag in a state before inversion from the attachment side base fabric side in the manufacturing process of the airbag of FIG. Schematic perspective view (reinforcement cloth omitted).
FIG. 3 is a schematic longitudinal sectional view showing a bag inflated state in the vehicle airbag of the present invention (A-A line portion in FIG. 5).
4 is an enlarged cross-sectional view of an essential part showing a state where the bag of the inflator mounting portion in FIG. 3 is in the middle of inflating the bag (AA line portion in FIG. 5).
FIG. 5 is a schematic plan view of an attachment-side base fabric provided with a laminated portion in the manufacturing process of the airbag of FIG.
12, 112 Inflator 14, 114 Retainer 16, 116 Attachment side base fabric 18, 118 Opposite side base fabric 20, 120 Sewn portion 22, 122 Fabric laminated portion 24, 124 Tether 26, 126 Rectifier fabric 28, 128 Reinforcement cloth 130 Flameproof cloth 136 Bag holder (bag holding member)
B Airbag w Retainer width S1 Tether base sewn part S3 Temporary stitching part inside retainer width

Claims (3)

An outer peripheral edge of an attachment-side base fabric provided with a gas inflow opening and having a retainer disposed on an inner peripheral edge of the gas inflow opening, and attached to the bag holding member, and a facing base fabric facing the attachment-side base cloth sutured together is formed a fabric laminated portion is formed on the periphery of the gas inlet opening in the inner surface of the attachment side base cloth, the fabric laminate unit have the respective source portion to the fabric laminate portion A vehicular airbag provided with a tether and a rectifying cloth , each extending in the same direction ,
The cloth layered portion excluding the baffle cloth and including the tether is disposed on the attachment-side base cloth outside the retainer length (hereinafter referred to as “ retainer width”) in the direction in which the tether base portion is connected . The vehicle airbag, wherein the rectifying cloth and the tether are sewn together and are not sewn together outside the retainer width. The vehicle airbag according to claim 1, wherein the cloth laminated portion including the flow rectifying cloth is temporarily sewn to the attachment-side base cloth inside the retainer width. The vehicle airbag according to claim 1, wherein an inner peripheral edge of a gas inflow opening of the cloth laminated portion is welded.

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