KR20080078451A - A curtain type airbag and a preparation method thereof - Google Patents

Abstract

A curtain-type airbag and a method for manufacturing the same are provided to couple the air bag to a vehicle body through a sewing scheme between a coupling part and a deploy part of the airbag or a welding scheme using heat or ultrasonic waves. A curtain-type air bag(100) includes a deploy part(20) and a coupling part(10). The coupling part is coupled to a body of the vehicle. The deploy part is deployed in accident. The deploy part includes an expansion part(22) and a non-expansion part(26). The expansion part is deployed by air, and the non-expansion part is not deployed by the air. The expansion part includes two fabric layers separated from each other. The two fabric layers include a contact point between the two fabric layers. The coupling part is a single fabric layer and has a tube type. The coupling part includes an air introducing port in the vicinity of the deploy part and the expansion part.

Description

A curtain type airbag and a preparation method

1 briefly illustrates the structure of a conventional curtain airbag,

Figure 2 shows the structure of the vehicle body fastening portion of the curtain airbag according to the first embodiment of the present invention.

Figure 3 briefly shows the structure of the deployment portion of the curtain airbag according to the first embodiment of the present invention.

Figure 4 briefly shows the structure of the curtain airbag coupled to the vehicle body fastening portion and deployment portion according to the first embodiment of the present invention.

Figure 5 briefly shows the structure of the vehicle body fastening portion of the curtain airbag according to the second embodiment of the present invention.

Figure 6 shows the cutting shape of the deployment portion of the curtain-type airbag according to the second embodiment of the present invention.

Figure 7 shows the structure of the deployment of the curtain-type airbag after joining by connecting the cut fabric in Figure 6 above.

Figure 8 shows the structure of a curtain airbag coupled to the vehicle body fastening portion and deployment portion according to a second embodiment of the present invention.

Figure 9 shows the structure of the vehicle body fastening portion of the curtain airbag according to the third embodiment of the present invention.

Figure 10 briefly shows the structure of the deployment portion of the curtain-type airbag according to the third embodiment of the present invention.

FIG. 11 briefly illustrates a structure of a curtain airbag in which a vehicle fastening portion and a deployment portion are coupled according to a third embodiment of the present invention.

Figure 12 shows the cutting structure of the case of manufacturing a curtain airbag by a conventional method (a) and the case of manufacturing a curtain airbag by the method of the present invention using a double-fabric fabric having air component properties (b) .

Figure 13 shows a pattern of a double fabric having air-parts used in the present invention, it shows a complete organization (a) having two separate flat weave surface (a) and an expanded pattern (b) thereof.

14 is a cross sectional view of a tissue forming a double fabric in accordance with the present invention.

15 is a cross-sectional view showing a double fabric inflated by air according to the present invention.

FIG. 16 is a cross-sectional view of a 2/2 basket weave forming a connection of a separate double weave and its organizational diagram (a), a cross section of its partial weave of a plain weave double weave and its organizational diagram (b), and a cross-section of a main weave and its organizational diagram ( c) is shown.

17 is a device for measuring the pressure resistance holding ratio of Examples and Comparative Examples.

[Technical Field]

The present invention relates to a curtain-type airbag and a method of manufacturing the same, and more particularly, a deployment part comprising a double fabric having an air part property and including an expansion part and an non-expansion part, and the deployment part connected when assembling with a vehicle body of an automobile. By combining the body fastening portion made of other plain weave, it has a high pressure-resistance rate and is convenient to manufacture, and minimizes the discarded portion of the double-woven curtain-type airbag fabric having the air-part property conventionally manufactured in one piece, curtain-type airbag body The present invention relates to a method of manufacturing a curtain airbag that can reduce a fastening failure due to a change in position of a fastening part.

[Private Technology]

Fabrics with the air component constituting the curtain airbags can be used for vehicle airbags, life jackets and the like. In particular, the airbag is used to prevent the driver's or passenger's head from being injured by the windshield or the side structure of the vehicle when the vehicle rolls over and rolls, and the curtain-type airbag is deployed in the side windshield of the vehicle during an accident. In this case, the curtain-type airbags should be inflated for a considerable time while the car is rolling in order to protect the passengers safely in an accident, in which case a fabric with a part is useful.

The method of manufacturing a product having air component properties such as a vehicle air bag is a method of sewing, fusion or bonding of two large fabrics, and the use of a double fabric in which two layers of fabric are partially joined by a joint point It is divided into ways.

However, as in the first method, a method of manufacturing an air-part product by sewing two fabrics, fusing them by heat or ultrasonication, or adhesively bonding the entire portion of the curtain-type airbag is a fabric comprising two layers. After the manufacture of a separate sewing process, fusion process or bonding process is required in a wide range in a variety of ways, the process is complicated and the production cost is also increased. In addition, since it is manufactured by the method of sewing, fusion, and adhesion at the entire connection part under pressure of the gas, it has a relatively low pressure retention rate. In this case, it is not possible to secure the stability of the vehicle overturning accident.

In order to solve this problem, recently, a method of manufacturing an air part product such as an air bag using a double fabric having the second air part property has been applied.

Fabrics with component parts by air, such as air, have two layers of fabric and a junction between these two layers of fabric. A fabric having a system closed by a junction point serves to firmly bind the two layers when each single layer is rapidly expanded by air or the like, and there should be no outflow of gas in the portion where the two layers are connected.

At this time, as a method for forming a contact point in the double-woven fabric having the air component properties, there are US Patent No. 6,220,309, US Patent 5,098,125, US Patent 5,011,183, US Patent 5,603,647, US Patent 6,595,244. The methods are primarily described for the tissue of the junction or delamination.

In addition, Korean Patent No. 2003-0016512, Korean Patent No. 2002-0081603, Korean Patent No. 2002-0043729, and Korean Patent No. 2002-0016233 disclose a method of adding sewing in a method of manufacturing a curtain airbag. A method of making an air-part product is disclosed by sewing two fabrics together, fusing them by heat or sonication, or bonding them with an adhesive. The methods are mainly used to sew two plain weave fabrics at the entire joint, film lamination between the fabrics, and then fasten by sewing such as rubber coating.

Curtain-type airbags manufactured in this way are assembled inside the side of the vehicle, and deployed in the event of an accident to protect passengers. 1 briefly illustrates a structure of a general curtain type airbag 100. As shown in Figure 1, the curtain-type airbag is the upper part is fastened to the vehicle body by a plurality of fastening portions, the deployment portion 20 and the non-opening portion 10 is stored in the upper side of the vehicle in a folded state, in case of accident It is developed in the form of 20 of 1. At this time, the curtain airbag is deployed from the top to the bottom while supporting the fastened upper portion is located between the passenger and the body. The body fastening portion of the curtain airbag is fixed to the vehicle body so that the airbag can be deployed into a predetermined space, and serves to fix the airbag to be continuously positioned in an appropriate space.

By the way, in the case of the conventional double-woven curtain type airbag having air component properties, the body fastening part and the developing part are manufactured integrally and fastened with the car body. In this case, the area of the discarded fabric is large, high temperature, Due to the problem that the size of the airbag fabric changes slightly when exposed to a low temperature or high humidity environment for a long time, the assembly hole of the fastening part and the position of the car body assembly part are not accurate when fastening with the car body. It was. If the position of the assembly is not accurate, the fastening part may be torn during deployment of the curtain airbag.

In addition, the method of connecting the body fastening portion of the curtain airbag cushion is disclosed in Korean Patent Laid-Open No. 2005-0076034. The method comprises a cushioning portion which is sewn in an overlapping state while forming the bends themselves so as to cushion shocks upon deployment to the fastening portion of the curtain-type airbag integrally woven. However, the method can not reduce the amount of discarded fabric generated during the manufacture of the curtain-type airbag, and also because the configuration is not to determine the position of the body fastening portion, but to the configuration of the reinforcing buffer portion, thereby improving the effect of improving the assembly performance. You can't expect it.

In order to solve the above problems in the prior art, an object of the present invention is to separately develop the vehicle body fastening portion made in the form of flat weave and the development unit made in the form of a double fabric having air component properties, and then separating them Curtain-type airbags that can be connected to the parts by sewing or gluing to increase the efficiency of production and maintain proper pressure resistance ratio, reduce the amount of fabric required during manufacturing, and facilitate specification changes to improve assembly. It is to provide a manufacturing method.

In order to achieve the above object, the present invention is a curtain-type airbag comprising a vehicle body fastening portion for connecting to an automobile body and an unfolding part deployed during an accident, the unfolding part having an air part property and an unexpanded part without air part property. It provides a curtain-type airbag that includes a part.

In addition, the present invention includes a process for cutting the vehicle body fastening portion for connecting to the vehicle body in a single layer fabric, cutting the unfolded portion unfolded in a double fabric having air component properties, and combining the vehicle body fastening portion and the deployment portion Provided is a method of manufacturing a curtain airbag.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a curtain-type airbag and a method of manufacturing the curtain-type airbag manufactured by making a double-woven fabric, and separately manufacturing the body fastening portion in a flat-woven fabric, and then combining them to each other.

The present invention can increase the number of times of repeated production of the curtain-type airbag deployment portion when manufacturing the curtain-type airbag through the combination of the deployment portion and the separate body fastening portion can reduce the fabric consumption and can secure a productivity improvement of about 10-20%. .

In the present invention, the development part preferably includes an expansion part having air component properties and an non-expansion part without air component properties. In addition, it is preferable that the expandable part having air part property is a double fabric having air part property, and the non-expanded part is preferably a single layer fabric having no air part property as a plain woven fabric.

Preferably, the vehicle body fastening portion is coupled to a double fabric having air component properties of the deployment portion.

In addition, the present invention has a form in which the vehicle body fastening portion and the tubular gas flow tube are coupled to each other, and the gas flow tube should have a gas inlet in contact with the deployment portion. Referring to the drawings, FIG. 5A illustrates a vehicle body fastening portion, FIG. 5B illustrates a tubular gas flow tube, and FIG. In addition, as shown in FIG. 6, the gas inlet and the deployment part should be in contact with each other. Otherwise, there is a problem that the air leaks all into the gap.

Hereinafter, a method of manufacturing the curtain airbag of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 shows the structure of the vehicle body fastening portion of the curtain airbag according to the first embodiment of the present invention. Figure 3 briefly shows the structure of the deployment portion of the curtain airbag according to the first embodiment of the present invention. Figure 4 briefly shows the structure of the curtain airbag coupled to the vehicle body fastening portion and deployment portion according to the first embodiment of the present invention.

As illustrated in FIG. 2, a vehicle body fastening part having the structure of FIG. 2 is manufactured by using a woven fabric woven in a single layer fabric. And, in the present invention by applying the double fabric having the expansion portion of the expansion portion of the deployment portion that directly injects gas when the curtain airbag deployment in the structure of FIG. . Subsequently, the lower part of the body fastening part, which is the single-layer fabric of FIG. 2, is padded on the portion of the non-expansion part 26 for coupling of the upper part of the development part of the double fabric having the air part property of FIG. Curtain-type airbag 100 having a can be manufactured.

Figure 5 briefly shows the structure of the vehicle body fastening portion of the curtain airbag according to the second embodiment of the present invention. Figure 6 shows the cutting shape of the deployment portion of the curtain-type airbag according to the second embodiment of the present invention. Figure 7 shows the structure of the deployment of the curtain-type airbag after joining by connecting the cut fabric in Figure 6 above. Figure 8 shows the structure of a curtain airbag coupled to the vehicle body fastening portion and deployment portion according to a second embodiment of the present invention.

As shown in FIG. 5, in order to form a vehicle body fastening portion, a body flow fastening portion and a gas flow tube shape of (b) of a tubular structure connected to the vehicle body of FIG. To foundation. Subsequently, the structure of (b) is placed below and the structure of (a) is positioned over 18 parts of (b), and then the two structures are combined to produce a vehicle body fastening part having the structure of FIG.

In addition, as shown in FIG. 6, after the upper part into which the filling gas flows is opened, the unfolded part is cut using the double fabric fabric, and the cutting structure of FIG. 6 is combined to form the structure of FIG.

Subsequently, by connecting the upper and lower parts of the deployment part of FIG. 7 to the 16 and 18 parts of the vehicle body fastening part 10 of FIG. 5, the curtain type airbag 100 having the structure of FIG. 8 may be manufactured.

Figure 9 shows the structure of the vehicle body fastening portion of the curtain airbag according to the third embodiment of the present invention. Figure 10 briefly shows the structure of the deployment portion of the curtain-type airbag according to the third embodiment of the present invention. Figure 11 briefly shows the structure of the curtain airbag coupled to the vehicle body fastening portion and deployment portion according to the third embodiment of the present invention.

That is, the present invention uses a plain weave fabric, which is a single layer fabric, and as shown in FIG. 9, a shape (a) and a tubular gas flow tube in which a gas flow guide tube 19 is added to a part of the vehicle body connecting portion of FIG. 5. After cutting the shape (b), the structures of (a) and (b) are combined to manufacture the vehicle body fastening portion 10 having the structure of (c). In addition, the present invention cuts the development part including the expanded portion and the non-expanded portion in an open form in which the filling gas of FIG. 10 flows using the double fabric. Subsequently, the present invention may manufacture the curtain airbag 100 having the structure of FIG. 11 by combining the vehicle body connecting portion 10 of FIG. 9 and the developing portion of FIG. 10.

In the present invention, when there is an inflator connector 19 which is a gas flow guide tube on the side of the vehicle body fastening portion as shown in FIG. 9, it is possible to keep the open section by minimizing the air leakage inside the deployment part.

2 to 11, reference numeral 100 denotes a curtain airbag, 10, 12, and 14 are single-layer fabrics made of plain weave to form a body fastening, 16 and 28 are tubular gas flow tubes, and 19 is gas. Inflator connection, which is a flow guide tube, 20 is an expansion part, 22 is an inflated part made of a double fabric having pneumatic properties, 18, 26, 40 are non-expansion parts for supporting the expansion part and 24 is partially joined It is a double fabric, which is a joining portion that forms a boundary between the expanded portion and the non-expanded portion.

On the other hand, the double fabric used in the expanded portion of the development of the present invention is characterized in that the air component consisting of two fabric layers separated from each other weaving at the same time using a weaving machine, and a joining portion of the two fabric layers separated from each other As a double fabric which has, it is preferable that the pattern of 1 or more types of mixed textiles is included.

Figure 13 shows a pattern of a double fabric having air-parts used in the present invention, it shows a complete organization (a) having two separate flat weave surface (a) and an expanded pattern (b) thereof. Figure 14 is a cross sectional view of a tissue forming the double fabric of the present invention. As shown in Figure 14, the double fabric of the present invention is composed of a layer separating portion (A, B) consisting of two fabric layers separated from each other, and a junction point (C) for joining the two fabric layers separated from each other Is done. In the air fabricated double fabric of the present invention, two woven fabric layers (A or B in FIGS. 14 and 15) separated from each other on a weaving machine are simultaneously woven using a jacquard loom, and the two fabric layers The joining portion (C) for joining the 2/2 basket weave (a in Fig. 16), the main runner (c in Fig. 16), partial weaving of the double weave (b in Fig. 16), plain weave, or one kind thereof It is woven including the above mixed weave.

In addition, the present invention is preferably coated with a synthetic resin double fabric having air component properties in order to lower the amount of air emissions. The synthetic resin used for the coating may be a synthetic resin commonly used for fiber coating, and of course, the silicone coating is preferably suitable for maintaining airtightness and strength during development. Silicone resin coating is to effectively fill the gap of the double fabric fabric, can be carried out on one side or both sides of the fabric surface, the coating method is preferably a multi-stage coating to perform a plurality of coatings.

In addition, it is very important for the airtightness of the double fabric to have a minimum elongation to withstand the tensile force by high pressure air or the like. Therefore, the method of forming the tissue at the point where the two layers are separated or the point at which the stitching starts as described above becomes the most important factor in the design of fabrics with parts by gas.

In addition, in order to prevent the rupture when the curtain-type airbag is deployed by the inflat of the actual high temperature and high pressure, the bark strength is at least 80 Kg when the joint portion (Fig. 14C) is measured for the bark strength according to ASTM D 5822 method. It should be more than / in, and the amount of air escape to the joint during deployment should be minimized, and the cut elongation should not exceed 60% to prevent the yarn from melting due to high heat. In particular, since curtain-type airbags have a relatively large amount of coating compared to general airbags, it is very important to maintain the strength when the fabric is worn by vibration of the vehicle in order to function as a curtain-type airbag even after a long period of time. .

In addition, the vehicle body fastening portion connected to the development portion in the present invention can be formed by cutting using a plain weave fabric woven in a general manner. For example, the body fastening part fabric in the present invention is used after weaving a general fabric having a weaving pattern of plain weave using a loom and then coated with synthetic resin. The car body fastening part is cut and used in the form of Figure 2 using the general fabric is completed coating.

As described above, the present invention is produced by using the double-woven fabric of the curtain-type airbag to the center of the deployment part, the body fastening portion is made of a plain weave fabric separately from the deployment portion, and then connected to each other to produce a curtain-type airbag, It can reduce the requirement of fabric produced by double weave and compensate the disadvantage that had to change the whole weaving pattern even when changing the shape of the body part of the curtain airbag by the assembly with the car body regardless of the deployment performance. In particular, the method of the present invention can secure a higher pressure retention rate and the convenience of manufacturing than the method of manufacturing the entire portion of the curtain-type airbag having the conventional air component properties (sewing type). 12 shows a case of manufacturing the curtain airbag by the conventional method (a) and a case of manufacturing the curtain airbag by the method of the present invention (b), and it can be seen that the fabric requirement is reduced. That is, as in Figure 12 (a) is conventionally manufactured in one piece, the fabric portion is discarded, the present invention cuts only the development portion as shown in Figure 12 (b) to reduce the fabric requirements, deployment due to poor fastening The tearing of the fastening part can be greatly reduced, and the stability of the vehicle overturning accident can be secured.

Hereinafter, preferred examples and comparative examples of the present invention are described. However, the following examples are only one preferred embodiment of the present invention and the present invention is not limited to the following examples.

Example  One

In order to manufacture the curtain-type airbag, the non-developed portion was cut in the direction of the vehicle body fastening portion in the shape of FIG. 2 using a plain weave fabric.

Then, using the double fabric fabric was cut to the development part 20 to be deployed at the time of accident in the shape of FIG. The double woven fabric is a woven fabric using 420 denier polyamide multifilament as warp and weft yarns, and has air component performance only in the double woven part.

Then, sewing the lower portion (Fig. 2) of the vehicle body fastening portion made of a plain weave made separately as described above to have the form of Figure 4 and the upper portion (26 of Fig. 3) of the development portion of the double-woven fabric having air component performance Combined.

As a result, as shown in Figure 12 (b), by producing the development portion of the double fabric having air component properties, it was possible to apply five repeat units to a certain fabric width, the fabric of about 400mm / ea required, The fabric requirement could be reduced more.

Example  2

Except as follows, it was carried out in the same manner as in Example 1 to prepare a curtain airbag.

Using a plain weave, as shown in Fig. 5, after cutting the structure connected to the vehicle body of (a) and the gas flow pipe shape of (b), the structure of (b) is placed below the (b) By positioning the structure of (a) over 18 parts and sewing, a vehicle body fastening part having the structure of 10 of (c) was manufactured.

Thereafter, as shown in FIG. 6, after the upper part of the filling gas flows into the open shape, the unfolded part is cut using a double fabric fabric, and the cutting structure of FIG. 6 is sewn to have the structure of FIG. 7.

Then, by sewing a combination of 16 and 18 parts of the vehicle body fastening portion 10 of Figure 5 and the upper end portion of the developing portion of Figure 7, a curtain airbag having the structure of Figure 8 was manufactured.

Example  3

Except as follows, it was carried out in the same manner as in Example 1 to prepare a curtain airbag.

As shown in FIG. 9, after cutting the shape (a) and the tubular gas flow pipe shape (b) including the gas flow guide pipe 19 added to a part of the vehicle body connection part of FIG. 5, (a) and Combining the structure of (b) with a sewing to manufacture a vehicle body fastening portion 10 having the structure of (c).

In addition, by using a double fabric, the development part was cut in an open form in which the filling gas of FIG. 10 flows.

Subsequently, by sewing and connecting the vehicle body connecting portion 10 of FIG. 9 and the developing portion of FIG. 10, a curtain airbag having the structure of FIG. 11 was manufactured.

Comparative example  One

As shown in FIG. 12A, a curtain airbag was manufactured in a shape having a vehicle body fastening unit integrated with an existing double-woven curtain airbag deployment unit by a conventional method.

Comparative example  2

A curtain-type airbag was manufactured in the same manner as in the example, except that the expanded portion was stitched together by sewing two single-layer fabrics instead of a partially stitched double fabric.

That is, the embodiment includes the fabrication of a double fabric partially connected to the reference numeral 24 of FIGS. 6 to 10, Comparative Example 1 is a sewing type (sewing type) stitching two single-layer fabric by sewing Including that produced by.

Experimental Example 1

The physical properties (maximum pressure and internal pressure retention) of Example 1 and Comparative Example 1 were compared with the raw material requirements. At this time, the pressure retention was measured using the measuring apparatus of FIG. That is, as shown in Figure 17, when the air is injected, the pressure in the air bag is increased, at this time reaches the maximum pressure, at this time was observed the change in the air bag internal pressure after blocking the injected air. Since this operation is preferably controlled electronically to minimize the error, the electronic control device is used for the injection and blocking of the air.

As a result, the maximum pressure and the pressure retention of Example 1 and Comparative Example 1 showed a similar effect. However, when comparing the fabric requirements, as shown in (a) of FIG. 12, in Example 1, five repeating units could be applied to the same width, while in Comparative Example 1, only four repeating units could be applied. Since the fabric requirement is about 500 mm / ea, the fabric requirement was increased by about 20% compared to Example 1.

Experimental Example 2

The internal pressure retention rates of Examples 1 and 2 and Comparative Example 2 were compared.

As a result, in the case of Example 1 of the present invention, the pressure retention rate was about 70% higher than that of Comparative Example 2 manufactured in a sewing type. In addition, Example 2 exhibited a pressure retention of about 40% higher than that of Comparative Example 2 prepared in a sewing type.

According to the present invention, by manufacturing a curtain type airbag deployment part and a vehicle body fastening part separately, a curtain type airbag having a double fabric type having air component properties can be reduced, and thus the fabric amount per unit cushion required in the same width when manufacturing a conventional curtain type airbag can be reduced. The fabrication process and fabrication process according to the specification change by assembling the development part by using the pre-made part and moving only the position of the fastening part to be manufactured separately when the specification change is progressed to improve the assembling with the car body regardless of the performance. This reduces the need for In addition, when the reinforcement for improving the flow of the gas flow portion, it is possible to easily apply the reinforcement method through the body fastening separately manufactured.

Claims (6)

A curtain-type airbag including a body fastening portion for connecting to an automobile body and an unfolding portion deployed in an accident, And said deployment portion comprises an inflation portion having air component properties and a non-expansion portion without air component properties. 2. The curtain-type airbag of claim 1, wherein the inflating portion having air component properties is a double fabric having air component properties including a joining point between two fabric layers separated from each other and the two layers of fabrics. 2. A curtain airbag according to claim 1 wherein the body fastening portion is tubular as a single layer fabric without air component properties and is combined with a double fabric having air component properties of the deployment portion. The method of manufacturing a curtain airbag according to claim 1, wherein the fastening portion forms an air inlet at a portion adjacent to the inflation portion of the deployment portion. The curtain type airbag according to claim 1, wherein the combination is a method of sewing two fabrics of a vehicle fastening portion and a developing portion, a method of fusion by heat or ultrasonication, or a method of adhering with an adhesive. Cut the bodywork fastenings from the monolayer fabric for connecting to the car bodywork, Cut out the unfolding part from the double fabric with air part characteristics, Combining the vehicle body fastening part and the deployment part Curtain-type airbag manufacturing method comprising a.

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