JP4942258B2 - Automobile side airbag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automobile side impact airbag, and more particularly to an automobile side impact airbag in which base fabrics can be easily joined together.
[0002]
[Prior art]
The automobile is equipped with various airbags. For example, an airbag that is deployed in a curtain shape is stored in a folded state on the roof rail portion of the vehicle body, and when the vehicle collides, the airbag is deployed downward to protect the passenger's head. (For similar technology, refer to Japanese Patent Laid-Open No. 2001-1854).
[0003]
This type of airbag has a bag-like structure in which two base fabrics that are superposed or folded to face each other are joined together at an outer peripheral joint. And the gas of an inflator can be introduce | transduced into the inside from the gas inlet provided in the part. The outer peripheral joint portion of the airbag has a structure in which a sewing portion using a sewing thread and an adhesive portion using an elastic adhesive are combined in order to improve pressure resistance and airtightness.
[0004]
Specifically, first, an elastic adhesive having a predetermined thickness is applied in a line shape to the outer periphery of one base fabric, and the other base fabric is placed on the outer fabric and heated and solidified, whereby the outer peripheral joint portion Form. Next, the base fabrics of the parts joined by the adhesive part are sewn with a sewing machine in a state where the adhesive part is sandwiched, thereby forming a sewing part. The sewing needle forms one or a plurality of sewing portions in the bonded portion while passing through the central portion in the width direction of the bonded portion.
[0005]
[Problems to be solved by the invention]
However, in such a conventional technique, since the sewing portion is formed in the center portion in the width direction of the bonded portion of the outer peripheral joint portion, the sewing needle passes through the thick portion of the bonded portion, and the sewing needle is sewn. Resistance increases. For this reason, a high output sewing machine is required, and sewing work becomes difficult. Further, by passing the sewing needle through the thick part of the bonding portion, the sewing needle is easily soiled by the elastic adhesive of the bonding portion even after solidification, and there is also the trouble of frequently replacing the sewing needle.
[0006]
The present invention has been made by paying attention to such a conventional technique, and provides a side impact airbag for an automobile that can be easily sewn and the sewing needles are hardly soiled.
[0007]
[Means for Solving the Problems]
In the invention according to claim 1, the outer peripheral joint portion between the two base fabrics that are overlapped or overlapped with each other is applied to the corresponding position of the outer peripheral joint portion, and is crimped to the two base fabrics. An expansion chamber is formed by joining with an adhesive part made of an elastic adhesive solidified with a JIS-A hardness of 20 or less and a thickness of 0.1 to 1.0 mm, and after the joining, a sewing part with a sewing thread The airbag for a side impact of an automobile formed in a bag shape by providing a sewing portion of the outer peripheral joint portion at an outer peripheral end portion or an outer proximity position of the adhesive portion, and the outer peripheral end of the adhesive portion is sewn. It is crushed thinly and maintains the thinly crushed state after sewing .
[0008]
According to the first aspect of the present invention, the outer peripheral joint portion between the two base fabrics that are overlapped with each other by being superposed or folded is applied to the corresponding position of the outer peripheral joint portion, and is crimped to the two base fabrics. Then , an expansion chamber is formed by bonding with an adhesive portion made of an elastic adhesive solidified with a JIS-A hardness of 20 or less and a thickness of 0.1 to 1.0 mm. After the bonding, a sewing thread is used. An airbag for a side collision of an automobile formed in a bag shape by a sewing portion, wherein a sewing portion of the outer peripheral joint portion is provided at an outer peripheral end portion or an outer proximity position of the adhesive portion, and an outer peripheral end of the adhesive portion is Since it is thinly crushed when sewing and maintains the thinly crushed state even after sewing, the sewing work becomes easy when sewing using the adhesive portion, and the adhesive is less likely to adhere to the sewing needle, As a result, the sewing needle becomes difficult to get dirty. Even if the position to be sewn is not the outer end portion of the adhesive portion, if it is the outer proximity position, the outer end is caused by the pressure applied to the adhesive portion made of a thick adhesive of 0.1 to 1.0 mm. since part of the elastic adhesive can protrude thinned to the sewing position in the ulcer Succoth, it can be sewn across the protruding portion. By passing the sewing portion through the adhesive portion as much as possible, the airtightness of the sewing thread portion can be ensured by the elastic adhesive, and there is no need to use another sealant in order to maintain the airtightness.
[0009]
The invention according to claim 2 is provided with an inner joint portion formed of a sewing portion by a sewing thread and an adhesive portion by an elastic adhesive inside the outer peripheral joint portion, and an expansion chamber is formed around the inner joint portion. The sewn part of the inner joint part was provided at the end part on the anti-expansion chamber side of the adhesive part or the position adjacent to the anti-expansion chamber side.
[0010]
According to the second aspect of the present invention, even if the airbag has a structure in which another inner joint portion is provided inside the outer peripheral joint portion, the sewing portion at the inner joint portion is the anti-expansion chamber side end of the adhesive portion. As is the case with the outer peripheral joint, the anti-expansion chamber side end of the adhesive portion is crushed and thinned, and the sewing operation is facilitated. It becomes difficult to get dirty.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS. The airbag 1 is housed in a folded state in a roof rail inner at the upper part of a vehicle body (not shown), and is deployed in a curtain shape toward the lower side when a car collides. This type of airbag 1 requires a longer time to maintain inflation than other types, and particularly requires high pressure resistance and airtightness.
[0014]
The airbag 1 has a shape in which a front seat inflatable portion 2 that protects a front seat occupant and a rear seat inflatable portion 3 that protects a rear seat occupant are connected by a communication portion 4 having a small vertical dimension. A gas inlet 5 is formed in the part.
[0015]
The airbag 1 is obtained by polymerizing two base fabrics 6 cut into the same shape (a single piece may be cut into a symmetrical shape and folded), and the gas inlet 5 remains on the outer periphery thereof. The outer periphery joining part 7 is formed and the whole is made into a bag shape. A circular inner joint 8 is also formed at the center of each of the front seat expansion portion 2 and the rear seat expansion portion 3. An expansion chamber 9 (see FIG. 2) is formed around the inner joint portion 8. By providing the inner joint portion 8, the expansion thickness of each of the front seat expansion portion 2 and the rear seat expansion portion 3 can be set. Can be suppressed.
[0016]
The outer peripheral joint portion 7 is formed of an adhesive portion 7a made of a silicon-based elastic adhesive, and two first sewing portions 7b and second sewing portions 7c made of 1260 denier sewing threads. The first sewing portion 7b and the second sewing portion 7c are offset outward with respect to the bonding portion 7a. The first sewing portion 7b corresponds to the outer end portion 10 of the bonding portion 7a, and the second sewing portion. 7c is slightly away from the bonding portion 7a to the outside.
[0017]
The inner joint portion 8 is also formed of an adhesive portion 8a similar to the outer joint portion 7, and a first sewing portion 8b and a second sewing portion 8c. The 1st sewing part 8b and the 2nd sewing part 8c are offset to the center side (the anti-expansion chamber 9 side) of the inner side joining part 8 with respect to the adhesion part 8a, and the 1st sewing part 8b is opposite to the adhesion part 8a. It corresponds to the expansion chamber side end portion 11 (FIG. 4), and the second sewing portion 8c is slightly separated from the bonding portion 8a to the anti-expansion chamber side. Therefore, the 1st sewing parts 7b and 8b are "sewing parts" concerning the present invention.
[0018]
Next, a method for manufacturing the airbag 1 will be described. First, a thick adhesive is applied to each of the positions corresponding to the outer peripheral joint 7 and the inner joint 8 of the base fabric 6. The other base cloth 6 is polymerized thereon and passed between two rollers having a predetermined interval (0.8 mm), and the base cloth 6 and the elastic adhesive are pressure-bonded. Thereafter, heating is performed in an atmosphere of 100 ° C. for 5 hours to solidify the elastic adhesive, and adhesive portions 7a and 8a having a thickness of about 0.8 mm are formed. In addition, as thickness of the adhesion parts 7a and 8a, 0.1-1.0 mm is suitable, More preferably, 0.5-0.8 mm is good. Moreover, after solidification, JIS-A hardness 20 or less is good.
[0019]
And the 1st sewing part 7b is formed with the sewing needle in the position corresponding to the outer side edge part 10 of the adhesion part 7a in the outer periphery junction part 7, and the 2nd sewing part 7c is formed in the outer side. Next, a first sewing portion 8b is formed by a sewing needle at a position corresponding to the anti-expansion chamber side end portion 11 of the bonding portion 8a in the inner joint portion 8, and a second sewing portion 8c is formed at the anti-expansion chamber side position. Form.
[0020]
Details of the sewing work at the inner joint 8 will be described with reference to FIG. The adhesive portion 8a before sewing has a solidified thickness [FIG. 4 (a)]. When the sewing needle starts to form the first sewing portion 8b on the anti-expansion chamber side end portion 11 of the bonding portion 8a, the anti-expansion chamber side end portion 11 is crushed and thinned by the pressure at the time of sewing. Therefore, the sewing needle easily passes through the anti-expansion chamber side end portion 11 and the two base fabrics 6 that are crushed and thinned (FIG. 4B). Therefore, the sewing operation is easy and the sewing needle is not easily soiled by the bonding portion 8a.
[0021]
In other words, conventionally, the thick portion at the center of the bonding portion 8a is sewn, and the bonding portion 8a is not easily crushed, and the sewing needle is passed through the thick bonding portion 8a. Although the needle was also easily soiled by the adhesive portion 8a (because it is an elastic adhesive, it easily adheres even when solidified), but this is not the case in this embodiment. Furthermore, although it is thin, since the 1st sewing part 8b has passed the anti-expansion chamber side edge part 11 of the adhesion part 8a, the airtightness of the sewing thread part of the 1st sewing part 8b is maintained. And finally, if the 2nd sewing part 8c is formed adjacent to the 1st sewing part 8b, manufacture of the airbag 1 will be completed [FIG.4 (c)]. The structure and function of the inner joint 8 as described above are the same in the outer joint 7.
[0022]
According to this embodiment, even if the adhesive portions 7a and 8a are thick, the end portions 10 and 11 can be squeezed thinly and sewn. Therefore, the thickness of the adhesive portions 7a and 8a is increased as compared with the prior art. The joint strength of the joint part 7 and the inner joint part 8 can be improved.
[0023]
In the above embodiment, the first sewing portions 7b and 8b are formed in the portions corresponding to the outer end portion 10 and the anti-expansion chamber side end portion 11 of the bonding portions 7a and 8a, but the positions where the 7b and 8b are formed. The outer end portion 10 and the non-expansion chamber side end portion 11 may be located outside the outer end portion 10 and the anti-expansion chamber side end portion 11. That is, at the close position, the outer end portion 10 and the anti-expansion chamber side end portion 11 can be crushed and thinly protruded to the sewing position by the pressure at the time of sewing, so that the protruding portion is sewn. be able to.
[0024]
In this embodiment, the side-impact curtain airbag 1 is taken as an example, but the present invention can also be applied to other airbags. Furthermore, the shape of the inner joint portion 8 is not limited to a circle.
[0025]
【Effect of the invention】
According to this invention, the outer peripheral joint portion between two base fabrics that are overlapped or overlapped with each other is applied to a corresponding position of the outer peripheral joint portion, and is crimped to the two base fabrics to be JIS- A An expansion chamber is formed by joining with an adhesive part made of an elastic adhesive solidified with a hardness of 20 or less and a thickness of 0.1 to 1.0 mm. After the joining, a bag is formed by a sewing part with a sewing thread. A side impact airbag of the automobile formed in a shape, wherein a sewing portion of the outer peripheral joint portion is provided at an outer peripheral end portion or an outer proximity position of the adhesive portion, and the outer peripheral end of the adhesive portion is sewn. Since it is thinly crushed and maintains the thinly crushed state even after sewing, it is easy to perform sewing work when sewing using the adhesive portion, and it is difficult for the adhesive to adhere to the sewing needle. The needle is less likely to get dirty. Even if the position to be sewn is not the outer end portion of the adhesive portion, if it is the outer proximity position, the outer end is caused by the pressure applied to the adhesive portion made of a thick adhesive of 0.1 to 1.0 mm. since part of the elastic adhesive can protrude thinned to the sewing position in the ulcer Succoth, it can be sewn across the protruding portion. By passing the sewing portion through the adhesive portion as much as possible, the airtightness of the sewing thread portion can be ensured by the elastic adhesive, and there is no need to use another sealant in order to maintain the airtightness.
[Brief description of the drawings]
FIG. 1 is a side view showing an airbag according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the airbag in an inflated state along the line SA-SA indicated by an arrow in FIG.
FIG. 3 is a cross-sectional view showing an airbag before inflation.
4 is an enlarged cross-sectional view showing a DA portion indicated by an arrow in FIG. 3, and shows a state before sewing (a), during sewing (b), and after sewing (c).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air bag 6 Base cloth 7 Peripheral junction part 7a Adhesion part 7b 1st sewing part (sewing part)
7c Second sewing portion 8 Inner joint portion 8a Adhesive portion 8b First sewing portion (sewing portion)
8c 2nd sewing part 9 Expansion chamber 10 Outer edge part 11 Anti-expansion chamber side edge part

Claims (2)

The outer peripheral joint portion between two base fabrics that are superposed or folded and faced each other is applied to the corresponding position of the outer peripheral joint portion, and is crimped to the two base fabrics to have a JIS-A hardness of 20 or less, In addition , an expansion chamber is formed by joining with an adhesive portion made of an elastic adhesive solidified with a thickness of 0.1 to 1.0 mm, and after the joining, an automobile formed in a bag shape by a sewing portion with a sewing thread A side-impact airbag,
A sewing portion of the outer peripheral joint portion is provided at an outer peripheral end portion or an outer proximity position of the adhesive portion, and the outer peripheral end of the adhesive portion is thinly crushed when sewing and maintains the thinly crushed state even after sewing. An airbag for a side impact of an automobile. An airbag for a side collision of an automobile according to claim 1,
Provided on the inner side of the outer peripheral joint is an inner joint consisting of a sewing part made of sewing thread and an adhesive part made of elastic adhesive, forming an expansion chamber around the inner joint, and the sewing part of the inner joint A side impact airbag for an automobile, characterized in that the airbag is provided at an anti-expansion chamber side end of an adhesive portion or an anti-expansion chamber side proximity position.

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