JP2024068321A - Hollow-woven airbag - Google Patents

Abstract

To provide a hollow-woven airbag that is an airbag which improves yield while securing air-tightness upon inflation and deployment in the airbag having a protrusion part that is protruded from a main body part.SOLUTION: A hollow-woven airbag 1 includes an approximately rectangular main body part 2a and a protrusion part 8 which is protruded from the main body part 2a to a rectangular short-axis direction and causes the main body part 2a to communicate with an inner part. The protrusion part 8 is elongated in a rectangular long-axis direction of the main body part 2a, a front side portion of an auxiliary part 2b formed to be elongated by the size shorter than a size in the short-axis direction of the main body part 2a is folded upon a back side portion, and a front upper corner part 2b1 is caused to approximately accord with a back lower corner part 2b2 and is formed to be bonded by sewing along a sewing line 7.SELECTED DRAWING: Figure 2

Description

The present invention relates to a woven airbag. More specifically, it relates to a woven airbag with improved yield.

In the past, in curtain shield airbags and the like that are installed in automobiles and that deploy vertically downward from the outer end of the ceiling in the vehicle width direction, there were cases where it was desirable to provide a protrusion that protrudes in the short axis direction of the rectangle from a substantially rectangular main body in order to expand the protective area. In the curtain shield airbag described in Patent Document 1, a first base fabric body that constitutes one side of the airbag and a second base fabric body that constitutes the other side are joined by sewing, and both the first base fabric body and the second base fabric body are formed by joining the main base fabric and the gas inlet portion, which is the protrusion, by sewing.

JP 2015-113056 A

In the curtain shield airbag described in the above-mentioned Patent Document 1, the first base fabric body and the second base fabric body are formed by cutting the main base fabric and the base fabric piece for the gas inlet section as separate bodies from the base fabric material and joining them by sewing. This makes it possible to improve yield by minimizing the amount of unnecessary parts that are cut off from the base fabric material and are not used. However, there was a problem in that it was difficult to ensure airtightness at the sewn part between the main base fabric and the base fabric piece for the gas inlet section when the airbag was inflated and deployed.

In view of these problems, the objective of the present invention is to provide an airbag having a protrusion protruding from the main body, which improves yield while ensuring airtightness when inflated and deployed.

The first invention of the present invention is a woven airbag having a substantially rectangular main body and a protruding portion that protrudes in the minor axis direction of the rectangle of the main body and communicates with the inside of the main body, and is characterized in that the protruding portion extends in the major axis direction of the rectangle of the main body, and a portion of the auxiliary portion that extends in the minor axis direction by a dimension shorter than the dimension of the main body in the minor axis direction is folded over the other portion of the auxiliary portion other than the protruding portion, and is partially joined in a state where it protrudes from the main body in the minor axis direction by a dimension larger than the dimension of the auxiliary portion in the minor axis direction.

According to the first invention, the main body and the protruding portion are internally connected to form a woven airbag, so there is no sewing between them and the airtightness is good. The auxiliary portion extends in the long axis direction of the rectangle of the main body, and in the short axis direction it extends an amount shorter than the short axis dimension of the main body, so the amount of protrusion in the short axis direction is small, improving yield. In addition, a part of the auxiliary portion is folded over the other portion, and is partially joined in a state where it protrudes in the short axis direction an amount larger than the short axis dimension of the auxiliary portion, thereby forming the protruding portion, so the amount of protrusion of the protruding portion can be ensured.

The second invention of the present invention is characterized in that in the first invention, the amount of protrusion of the protruding portion from the main body is approximately twice the amount of protrusion of the auxiliary portion from the main body.

The second invention makes it possible to improve the yield rate when weaving hollow-weave airbags while ensuring the amount of protrusion of the protrusion when the airbag is inflated and deployed.

FIG. 2 is a diagram showing a hollow woven airbag according to one embodiment of the present invention in a woven state. 13 is a diagram of a hollow woven airbag in which the auxiliary portion of the above embodiment is folded back to form a protrusion. FIG.

The following describes a woven airbag 1 according to one embodiment of the present invention with reference to Figures 1 and 2. In the following description, the directions are based on the up, down, front and rear directions when the woven airbag 1 is inflated and deployed inside the vehicle cabin, as indicated by the arrows in each figure.

The hollow woven airbag 1 is a woven airbag pouch for use in a curtain shield airbag device for automobiles. The hollow woven airbag 1 is formed by folding back a portion of a substantially rectangular planar base fabric 2, shown in FIG. 1, which has been woven and then cut to a predetermined shape, and partially sewing it as shown in FIG. 2. If necessary, a coating agent made of silicone resin may be applied to both sides of the base fabric 2 after weaving and before cutting.

As shown in FIG. 1, the base fabric 2 has a substantially rectangular double weave portion 3 with its longitudinal axis extending in the front-to-rear direction, a single weave portion 4 formed on the outer periphery of the double weave portion 3, a first joint portion 5 formed between the double weave portion 3 and the single weave portion 4, and a second joint portion 6 that partially connects the two pieces of fabric that make up the double weave portion 3 in the thickness direction.

As shown in FIG. 1, the base fabric 2 has an upper, substantially rectangular main body portion 2a with its major axis in the front-to-rear direction and its minor axis in the up-down direction, and a lower, substantially rectangular auxiliary portion 2b with its major axis in the front-to-rear direction and its minor axis in the up-to-down direction. The dimension of the major axis of the auxiliary portion 2b is set to about 1/2 of the dimension of the major axis of the main body portion 2a, and the dimension of the minor axis of the auxiliary portion 2b is set to about 1/3 of the dimension of the minor axis of the main body portion 2a. The auxiliary portion 2b is disposed below the central portion of the main body portion 2a in the front-to-rear direction. A gas inlet portion 2c is disposed above the central portion of the main body portion 2a in the front-to-rear direction, protruding obliquely upward toward the rear. The gas inlet portion 2c is a portion to which an inflator (not shown) is connected in an airtight state, and gas is introduced from the inflator into the double weave portion 3 during a vehicle collision. The base fabric 2 is known in the art as OPW or one-piece weave. Here, the up-down direction and the front-back direction correspond to the "short axis direction of the rectangle" and the "long axis direction of the rectangle" in the claims, respectively.

As shown in FIG. 1, the first joint portion 5 has a main portion 5a extending along the outer periphery of the main portion 2a and a sub portion 5b extending along the outer periphery of the auxiliary portion 2b. The main portion 5a and the sub portion 5b are continuous and connected by a front connecting portion 5c on the front side and a rear connecting portion 5d on the rear side. The front-to-rear dimension between the front connecting portion 5c and the rear connecting portion 5d is about half the front-to-rear dimension of the auxiliary portion 2b, and the double woven portion 3 of the main portion 2a and the double woven portion 3 of the auxiliary portion 2b are connected at this portion. When woven, the main portion 2a and the auxiliary portion 2b are joined over the entire front-to-rear direction, but when cut, the single woven portion 4 in front of the front connecting portion 5c is cut at a cutting line 2d extending in the front-to-rear direction, and the front portion of the auxiliary portion 2b is separated from the main portion 2a. Even in this state, the double woven portion 3 of the main body portion 2a and the double woven portion 3 of the auxiliary portion 2b are connected to maintain an airtight state.

As shown in FIG. 1, the second joint 6 is formed from the front to the rear as a front joint 6a, a middle front joint 6b, a middle rear joint 6c, and a rear joint 6d, all of which are intended to control the shape in the thickness direction when the hollow woven airbag 1 is inflated and deployed. One end of each of the front joint 6a, the middle front joint 6b, the middle rear joint 6c, and the rear joint 6d is formed in a loop shape, and the other end is connected to the first joint 5. This loop shape is intended to avoid excessive stress concentration at the end of each second joint 6 when the hollow woven airbag 1 is inflated and deployed, and to suppress gas leakage due to openings in the fabric.

As shown in FIG. 2, the front portion of the auxiliary part 2b of the base fabric 2, which is separated from the main part 2a, is overlapped on the rear portion of the auxiliary part 2b, which is folded back from the vicinity of the front connecting part 5c, and connected to the main part 2a. In this state, the front upper corner part 2b1 of the auxiliary part 2b is approximately aligned with the rear lower corner part 2b2 of the auxiliary part 2b, and they are sewn together at the sewing line 7 to form the protrusion 8, thereby obtaining the hollow woven airbag 1. At this time, the protrusion 8 protrudes vertically from the main part 2a by approximately twice the vertical dimension of the auxiliary part 2b. In the auxiliary part 2b, the front upper corner part 2b1 and the rear lower corner part 2b2 are located on the diagonal of a rectangle. In the hollow woven airbag 1, the double woven part 3 of the main part 2a and the double woven part 3 of the auxiliary part 2b are connected in an airtight state. Here, the front part and the rear part of the auxiliary part 2b correspond to the "part" and the "other part" in the claims, respectively.

The present embodiment configured as described above has the following effects. In the hollow woven airbag 1, the main body 2a and auxiliary body 2b are connected by the double weave portion 3 without sewing, so that the airtightness is good. The auxiliary body 2b extends in the front-rear direction, which is the long axis direction of the rectangle in the main body 2a, and protrudes little in the up-down direction, which is the short axis direction of the rectangle. This allows the base fabric 2 to be arranged with good yield during weaving, and the material cost can be reduced by improving the yield. In addition, by folding the front part of the auxiliary body 2b over the rear part and joining the front upper corner 2b1 and the rear lower corner 2b2, which are located on the diagonal of the rectangle, by sewing, the auxiliary body 2b can protrude downward by about twice the vertical dimension of the auxiliary body 2b, thereby expanding the protective area.

Although specific embodiments have been described above, the present invention is not limited to those appearances and configurations, and various modifications, additions, and deletions are possible without departing from the spirit of the present invention. For example, the following can be mentioned:

1. In the above embodiment, the hollow woven airbag 1 is applied to a curtain shield airbag device for an automobile, but the present invention is not limited to this and can also be applied to other automobile airbag devices, such as an airbag device disposed between the driver's seat and the passenger seat. It can also be applied to airbag devices used in airplanes, ships, railway vehicles, etc. other than automobiles.

2. In the above embodiment, the auxiliary portion 2b is configured to have a substantially rectangular shape, but is not limited to this, and may have other shapes, such as an oval shape, as long as it improves yield.

Reference Signs List 1 Hollow woven airbag 2 Base fabric 2a Main body portion 2b Auxiliary portion 2b1 Front upper corner portion 2b2 Rear lower corner portion 3 Double woven portion 4 Single woven portion 5 First joint portion 5a Main portion 5b Sub-portion 5c Front connecting portion 5d Rear connecting portion 6 Second joint portion 7 Stitching line 8 Protruding portion

Claims (2)

A hollow woven airbag having a substantially rectangular main body and a protruding portion protruding in a minor axis direction of the rectangular main body and communicating with the inside of the main body,
The protrusion extends in the long axis direction of the rectangle of the main body, and a portion of the auxiliary portion extending in the short axis direction a dimension shorter than the dimension of the main body in the short axis direction is folded over the other portion of the auxiliary portion other than the protrusion, and is partially joined to form a hollow woven airbag in a state where it protrudes from the main body in the short axis direction a dimension larger than the dimension of the auxiliary portion in the short axis direction. A hollow woven airbag according to claim 1, in which the amount by which the protrusion protrudes from the main body is approximately twice the amount by which the auxiliary portion protrudes from the main body.

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