JP5706218B2 - Curtain airbag and manufacturing method thereof - Google Patents

Description

  The present invention relates to a curtain airbag and a manufacturing method thereof, and more particularly to a curtain airbag that is mounted on a vehicle and protects an occupant from the impact of a side collision and a manufacturing method thereof.

  As a safety device for protecting an occupant that protects an occupant from an impact when a vehicle collides, an airbag device is widely used. As for the type, in addition to the conventional airbag apparatus for the driver's seat and the passenger's seat, a side collision (side collision) airbag apparatus is also mounted on the vehicle in recent years. This side-impact curtain airbag (hereinafter referred to as curtain airbag) has a large area to protect from the front seat to the rear seat, and the airbag is inflated and deployed in a narrow space between the seat and the vehicle body. Therefore, it is necessary to regulate the thickness and shape of the airbag at the time of inflating and deploying over a wide range as compared with airbags at other parts.

  One part that regulates the thickness and shape of airbags during inflation and deployment is the tether belt. For example, Patent Document 1 discloses a curtain airbag including an upper strap (tether belt) and a lower strap (tether belt). However, with such a structure, both ends of each tether belt must be stitched and / or bonded to respective locations inside the airbag, and both ends of the tether belt cannot be stitched and / or bonded at once. That is, after one end of the tether belt is stitched and / or bonded, the other end must be stitched and / or bonded, which is a laborious operation.

  For airbags that need to maintain the internal pressure in the deployed state over a long period of time, such as when the vehicle rolls over, a sealing agent is added to the seam to prevent air leakage in order to increase the airtightness of the airbag. However, if a tether belt is provided, a sealing agent must be added to the stitched portion of the tether belt, and there is a problem that the process and work time increase. Because of such problems, the current situation is that the penetration rate of curtain airbags with tether belts is not so high.

  As an airbag that does not use a tether belt, for example, Patent Document 2 discloses that the wall surface of two airbag panels is directly stitched together to adjust the thickness of the chamber during inflation and deployment. However, when the thickness is adjusted by directly sewing the panel wall surfaces in this way, the thickness of the stitched part cannot be obtained, and the occupant restraint at that part becomes extremely low, and the occupant protection function deteriorates. There is.

  On the other hand, Patent Literature 3 discloses a configuration in which a plurality of expansion chambers are formed on one surface side and a plurality of expansion chambers are formed on the other surface side by shifting from the expansion chambers in an airbag that does not use a tether belt. Yes. However, in this airbag, the expansion chambers on one side and the other side must be partitioned using an intermediate cloth, and these must be constructed integrally and continuously, making the stitching and bonding operations complicated, and producing There is a problem of low efficiency. Moreover, when this airbag is produced by adhesion (use of a sealing agent), it is necessary to silicone-coat both sides of the intermediate base fabric, which is disadvantageous in terms of weight reduction. Furthermore, since the airbag of patent document 3 is a structure which is hard to fold, it is unsuitable for compact accommodation.

Japanese Patent Laid-Open No. 10-138860 JP 2006-142861 A JP 2004-268880 A

  The present invention has been made in view of the above-described conventional problems, and has an unprecedented novel in which a sub-chamber portion extending with a free end is formed in an airbag, and the sub-chamber portion is overlapped with a restriction portion. The present invention has been completed by finding a practical structure. The present invention provides a curtain airbag that is easy to manufacture and store due to its simple structure, while maintaining a constant thickness during inflation and deployment, and a method for manufacturing the curtain airbag. Objective.

  The present invention is a curtain airbag manufactured by superposing two base fabrics, and is connected to a main chamber portion and a main chamber portion, and extends from the connecting portion with the main chamber portion and has a free end. And a regulating part that regulates the thickness of the main chamber part extending from the vicinity of the coupling part to the main chamber part side, and is arranged so that the sub chamber part overlaps the regulating part. It relates to airbags. By configuring in this way, the thickness of the main chamber portion is regulated to be constant by the regulating portion, and the regulating portion overlaps the sub chamber portion. The curtain airbag of the present invention refers to a curtain-like airbag that is deployed between the vehicle inner wall and the occupant in order to protect the occupant from the impact of a side collision.

  Moreover, it is preferable that the regulation part is joined by sewing and / or adhering two opposing base fabrics. By comprising in this way, a control part is easily formed by sewing and / or adhesion | attachment.

  Moreover, it is preferable that at least one of the main chamber portion and the sub chamber portion is provided with a fixing portion for fixing the sub chamber portion in a state of overlapping with the restriction portion. By comprising in this way, a subchamber part is fixed using a fixing | fixed part in the state which overlapped with the control part.

  Moreover, it is preferable that the fixing portion is formed in the vicinity of the free end of the sub chamber portion, and the fixing portion is fixed to the fixing portion of the curtain airbag to the fixing object. By comprising in this way, fixation of a subchamber part is performed simultaneously and the same location as fixation to the fixing target body of a curtain airbag.

  The present invention cuts two base fabrics to be overlapped to form a main chamber portion and a sub chamber portion connected to the main chamber portion and extending from the connecting portion with the main chamber portion and having a free end. A step of forming a main chamber in the main chamber, a step of forming a sub chamber connected to the main chamber at the connecting portion in the sub chamber, and a regulating portion for regulating the thickness of the main chamber. The present invention relates to a method for manufacturing a curtain airbag, which includes a step of forming a portion extending from the vicinity of a portion to the main chamber portion side and a step of arranging a sub chamber portion so as to overlap a regulating portion. By configuring in this manner, the thickness of the main chamber portion is regulated by the regulating portion, and an airbag having a structure in which the regulating portion and the sub chamber portion overlap each other is easily manufactured.

  According to the curtain airbag of the present invention, since the thickness of the main chamber portion is regulated to be constant, a vehicle interior space is secured, and the regulation portion having low shock absorption also overlaps with the sub chamber portion, so that a sufficient impact is achieved. Absorbability is obtained. Therefore, the airbag is lightweight and easy to manufacture, and has an excellent occupant protection function while having a simple shape and configuration that is easy to fold and store.

  In addition, when the regulating portion is formed by stitching and / or adhering two opposing base fabrics, the regulating portion is easily formed. Therefore, a tether belt may be provided inside the airbag or a plurality of fabrics may be provided. It is easier to manufacture the airbag than when the materials are stacked and stitched. Although it is known that the restricting portion is formed by stitching or bonding, when such a restricting means is employed, the restricting portion does not expand and shock absorption is not obtained. In the present invention, by combining the regulation means by stitching and / or adhesion and the sub chamber portion having a free end and extending, it is easy to manufacture and store with a simple shape, and to an occupant protection function. Also, an excellent configuration can be obtained.

  Furthermore, what provided the fixing | fixed part which fixes a subchamber part in the state which overlapped with the control part can overlap and fix a subchamber part on a control part easily and reliably. Furthermore, what fixed the fixing | fixed part to the free end vicinity of the subchamber part, and was comprised so that it might fix to the fixing | fixed part of a curtain airbag can shorten a process, and can also use a fixed location.

  Furthermore, according to the curtain airbag manufacturing method of the present invention, an airbag excellent in passenger protection function with sufficient interior space can be easily manufactured, so that the production efficiency is excellent.

1 is a schematic plan view of a curtain airbag according to a first embodiment of the present invention. FIG. 2 is a schematic plan view when the curtain airbag of FIG. 1 is inflated and deployed. It is AA sectional drawing of FIG. It is the schematic plan view which showed the state before folding the curtain airbag of FIG. It is ZZ sectional drawing of FIG. It is the figure which showed the state by which the curtain airbag of FIG. 1 was folded in three. FIG. 7 is a sectional view taken along the line ZZ in FIG. 6 and corresponds to FIG. 5. It is a schematic plan view of the curtain airbag by the 2nd Embodiment of this invention. FIG. 9 is a schematic plan view when the curtain airbag of FIG. 8 is inflated and deployed. It is a schematic plan view of the curtain airbag by the 3rd Embodiment of this invention. It is the schematic plan view which showed the state before folding the curtain airbag by the 4th Embodiment of this invention. It is YY sectional drawing of FIG. It is the figure which showed the state by which the curtain airbag of FIG. 11 was folded in three. It is YY sectional drawing of FIG.

  A curtain airbag according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic plan view of a curtain airbag according to a first embodiment of the present invention, FIG. 2 is a schematic plan view of the curtain airbag of FIG. 1 when inflated and deployed, and FIG. It is AA sectional drawing of 2. 1 and 2 are views of the curtain airbag as viewed from the occupant side.

  As shown in these drawings, the airbag main body 1 constituting the curtain airbag has two substantially rectangular base fabrics 2 and 3 overlapped, and the inside of the outer peripheral edge is sewn with a suture thread 12. It is joined by doing. There is an opening 4 that is not joined to a part of the outer periphery, and the airbag body 1 is attached to an inflator (not shown) through this opening 4. In addition, joining of an outer periphery is not limited to a stitch | suture, It can be set as joining by a sealing agent, and joining by the combined use of a stitching | suture and a sealing agent. When it is required to maintain the internal pressure of the deployed state for a long time such as several seconds while the vehicle rolls over, it is possible to seal the stitched place with a sealing agent such as a silicone resin system by jointing with stitching and the sealing agent preferable.

  As shown in FIG. 1, the airbag body 1 is connected to the main chamber portion 5 and the main chamber portion 5 by a connecting portion 13, and is separated from the main chamber portion 5 by a notch 7 except for the connecting portion 13. It is comprised from the subchamber part 6. FIG. A main chamber 10 is formed in the main chamber 5 which is a main portion of the airbag body 1 by sewing the base fabrics 2 and 3 and the outer peripheral edge thereof. The main chamber 10 is expanded by high-pressure gas from an inflator (not shown).

  The main chamber portion 5 is formed with a restricting portion 8 that extends linearly from the vicinity of a connecting portion 13 described later to the main chamber portion 5 side. Specifically, the restricting portion 8 is obliquely inclined so as to cross the center of the main chamber portion 5 from the lower part on the front side of the vehicle body (lower left direction in FIG. 1). The restricting portion 8 is obtained by joining two corresponding base fabrics 2 and 3 by stitching them together with a suture, thereby restricting the thickness of the main chamber portion 5. The restricting portion 8 is preferably formed so as to cross the vicinity of the center of the main chamber 10 from the viewpoint of restricting the thickness of the main chamber portion 5, and is preferably formed in the vicinity of the main chamber portion 5 on the diagonal line. . In addition, formation of the control part 8 is not limited to joining by a suture, and may be formed by adhesion using a sealant or may be formed by using a suture and a sealant in combination. When a deployment internal pressure over a long period of time is required for the airbag, it is preferable to seal the stitched portion with a sealing agent such as a silicone resin.

  A sub chamber portion 6 is connected to a lower portion of the main chamber portion 5 on the front side of the vehicle body (lower left direction in FIG. 1). A sub chamber 11 is formed inside the sub chamber 6 by sewing the base fabrics 2 and 3 and the outer peripheral edge thereof. The main chamber 10 and the sub chamber 11 communicate with each other through an opening formed by providing a non-joined portion at the connecting portion 13 between the main chamber portion 5 and the sub chamber portion 6. Therefore, when high-pressure gas from an inflator (not shown) enters the main chamber 10, the sub chamber 11 expands almost simultaneously with the main chamber 10 or next to the main chamber 10.

  The sub chamber portion 6 is formed along the outer shape of the main chamber portion 5 and is separated from the main chamber portion 5 except that one end thereof is connected to the main chamber portion 5 by the connecting portion 13. The other end is a free end extending from the connecting portion 13 side. As shown in FIG. 2, the sub chamber portion 6 is disposed so as to overlap with the restriction portion 8 formed in the main chamber portion 5 when the airbag is inflated and deployed. As a result, the restricting portion 8 is joined at the time of expansion and deployment, so that it does not expand, and as shown in FIG. 3, the outer surface of the main chamber portion 5 has a concave shape with low shock absorption, but the sub chamber portion 6 is expanded. By expanding, it becomes a rod shape, complements the concave shape on the outer surface of the restricting portion 8, and the airbag has an excellent occupant protection function in the entire range. In addition, although the subchamber part 6 is arrange | positioned in the back | inner side (vehicle interior side wall side) with respect to the main chamber part 5 in this Embodiment, you may arrange | position to the near side (passenger side).

  Further, a fixed portion 15 having a planar shape is formed in the vicinity of the free end of the sub chamber portion 6 so as to protrude. The fixing portion 15 is formed so as to coincide with a fixing portion 16a for fixing the airbag main body 1 to the vehicle body that is a fixing target body when the sub chamber portion 6 is arranged so as to overlap the restriction portion 8 at the time of inflation and deployment. Has been. By fixing the fixing portion 15 and the fixing portion 16a and fixing them with a known fixing means such as a bolt, both of them can be fixed simultaneously and at the same place.

  The curtain airbag having such a shape and configuration is light and easy to manufacture, and has a simple shape and configuration that is easy to fold and store. Since it expands while overlapping with 8, the low shock absorbing portion caused by the non-inflatable restricting portion 8 is eliminated, and the occupant protection function is excellent.

  The material of the curtain airbag main body is not particularly limited, but examples thereof include fibers, which can be used in the form of a fabric. Examples of fibers used include polyamide fibers such as nylon 6, 66 and 46, aromatic polyamide fibers (aramid fibers) represented by copolymers of paraphenylene terephthalamide and aromatic ether, and polyethylene terephthalate. Polyester fibers, wholly aromatic polyester fibers, vinylon fibers, rayon fibers, polyolefin fibers such as ultra high molecular weight polyethylene, polyoxymethylene fibers, sulfone fibers such as paraphenylene sulfone and polysulfone, polyether ether ketone fibers, polyetherimide Examples thereof include organic fibers such as fibers and polyimide fibers, and inorganic fibers such as glass fibers, ceramic fibers, carbon fibers, and metal fibers, and these are used alone or in combination. Of these, polyamide fibers such as nylon 6, 66, and 46 are preferable from a comprehensive viewpoint such as strength, durability, and cost.

  Examples of the fabric structure include woven fabric, knitted fabric, and non-woven fabric. In the case of woven fabric, plain weave, satin weave, twill weave, Panama weave, bag weave, etc. are mentioned, and in the case of knitted fabric, warp knitting, circular knitting and the like are mentioned. Among these, a woven fabric is preferable from the viewpoint of the elongation and strength of the fabric, and a plain woven fabric is more preferable.

  These fabrics are preferably coated on at least one side with a resin or the like for the purpose of improving heat resistance and reducing air permeability. Resin used for coating includes halogen-containing rubber such as chloroprene rubber, high baron rubber, fluorine rubber, silicone rubber, ethylene propylene rubber, ethylene propylene terpolymer rubber, nitrile butadiene rubber, styrene butadiene rubber, isobutylene isoprene rubber, urethane rubber , Rubbers such as acrylic rubber, and halogen-containing resins such as vinyl chloride resin, vinylidene chloride resin, chlorinated polyolefin resin, fluorine resin, urethane resin, acrylic resin, ester resin, amide resin, olefin resin, silicone resin, etc. Examples thereof include resins, and these are used alone or in combination. Among these, a silicone resin is preferable in terms of excellent heat resistance and weather resistance.

  The suture is not particularly limited, and a known suture can be used. For example, a suture obtained from the above-described fiber material can be used, and a spun yarn, a filament twisted yarn, or a filament resin processing can be used. Various yarns can be used. There are no particular limitations on the stitching method, and known methods such as main stitching, double chain stitching, one-sided stitching, overlock stitching, safety stitching, staggered stitching, and flat stitching can be applied.

  Moreover, as a sealing agent, various sealing agents can be used in the range which does not have a problem in adhesive strength, such as thermosetting adhesives, such as a silicone type, a urethane type, and an epoxy type, and a hot melt adhesive. In particular, when the base fabric of the airbag body is coated with a silicone resin, it is preferable to use the silicone resin as a sealant because the adhesive strength increases. The coating thickness is preferably 0.5 to 2.0 mm, and more preferably 0.5 to 1.0 mm. If the coating thickness is less than 0.5 mm, the adhesive strength tends to decrease, and if it exceeds 2.0 mm, the bonded portion tends to be bulky and the bag storage property tends to deteriorate. The application method of the sealing agent is not particularly limited, and a known application method is applied.

  Next, a method for manufacturing the curtain airbag according to the present embodiment will be described.

  First, the two base fabrics 2 and 3 constituting the airbag body 1 are cut into the shape of a curtain airbag, and the base fabrics 2 and 3 having the same shape are overlapped. In order to maintain the developed internal pressure for a long time, it is preferable that the base fabrics 2 and 3 are coated with a silicone resin on one side, and the silicone resin coated surfaces of the base fabrics 2 and 3 face each other and overlap each other.

  Next, the outer periphery of the overlapped base fabrics 2 and 3 and the periphery of the portion where the cut 7 is formed are stitched with the suture thread 12 to form the main chamber 10 and the sub chamber 11. The connecting portion 13 is provided with a non-joined portion so that the main chamber 10 and the sub chamber 11 communicate with each other. As a result, an air bag structure is formed in which the main chamber 10 and the sub chamber 11 are inflated by the entry of high-pressure gas from an inflator (not shown).

  Further, the restricting portion 8 is formed in the main chamber 10 so as to extend from the vicinity of the connecting portion 13 to the main chamber 10 side. Specifically, the restriction portions 8 are formed by sewing and joining the base fabrics 2 and 3. Expansion and deployment of the main chamber 10 is restricted by the restriction portion 8. The regulation portion 8 may be formed either before or after the main chamber 10 and the sub chamber 11 are formed.

  Next, in order to separate the main chamber 10 and the sub chamber 11 and to be connected at the connecting portion 13, a cut 7 is made in the overlapped base fabrics 2 and 3, and the main chamber portion 5 and the sub chamber portion 6 Form. As a result, the main chamber portion 5 and the sub chamber portion 6 are connected by the connecting portion 13. At this time, the notches 7 are preferably formed in parallel with the outer shapes of the base fabrics 2 and 3 so that the sub-chamber portion 6 has a long shape and becomes a rod shape when expanded. Thus, the sub chamber portion 6 is simply formed along the outer shape of the main chamber portion 5, and has a shape extending from the connecting portion 13 and having a free end. The cuts 7 are formed after the base fabrics 2 and 3 are overlapped, but the present invention is not limited to this, and the cuts 7 may be formed before the base fabrics 2 and 3 are overlapped. .

  Further, a fixing portion 15 is formed in the vicinity of the free end of the sub chamber portion 6. Specifically, it is preferable that the fabric is attached by stitching in the vicinity of the free end of the sub chamber portion 6, and this fabric is used as the fixing portion 15. The fixing portion 15 only needs to be formed before the sub chamber portion 6 is fixed.

  Next, the sub chamber portion 6 is disposed so as to overlap the restriction portion 8 when the airbag is inflated and deployed. And the fixing part 15 is made to correspond with the fixing part 16a for fixing the airbag main body 1 to a vehicle body, and the airbag main body 1 and the subchamber part 6 are fixed together. Thus, the curtain airbag is manufactured and fixed to the vehicle body. The fixing by the fixing part 15 is not an essential process for manufacturing the curtain airbag. Moreover, when fixing the subchamber part 6 so that it may overlap with the control part 8 using a sealing agent etc., a fixing | fixed part becomes unnecessary. Further, even when the fixing portion is formed, the fixing portion may be fixed in a state in which the sub chamber portion overlaps with the restriction portion at the time of inflation and deployment, so the airbag body is fixed to the vehicle body. It is not limited to what corresponds to the fixed part for doing.

  The fixing of the curtain airbag to the vehicle body will be described in more detail.

  4 is a schematic plan view showing a state before the curtain airbag of FIG. 1 is folded, FIG. 5 is a sectional view taken along the line ZZ of FIG. 4, and FIG. 6 is a diagram of the curtain airbag of FIG. FIG. 7 is a diagram showing a state of being folded in three, and FIG. 7 is a cross-sectional view taken along the line ZZ in FIG. 6 and corresponding to FIG. 4 and 5 show a state before the airbag body 1 is folded in three, and FIG. 4 corresponds to FIG. In these figures, two alternate long and short dash lines extending in the horizontal direction become folding lines when folded. When the airbag body 1 is folded along the fold line, the airbag body 1 is folded in three as shown in FIGS. The airbag body 1 is further folded small by bellows folding, roll folding, or the like. The fixed portion 15 and the fixed portion 16a, which are folded in this way and are in a compact state that can be easily accommodated in the inner wall of the vehicle body, are fixed to the vehicle body. As described above, the fixing portion 15 and the fixing portion 16a are preferably overlapped and fixed to the vehicle body. Since the curtain airbag has a simple shape and configuration, it is easy to fold and can be stored compactly as described above.

  FIG. 8 is a schematic plan view of a curtain airbag according to the second embodiment of the present invention, and FIG. 9 is a schematic plan view of the curtain airbag of FIG. 8 when inflated and deployed. Since the configuration of the curtain airbag according to the second embodiment is basically the same as that according to the first embodiment described above, differences will be mainly described.

  As shown in these drawings, in the curtain airbag according to the second embodiment, the main chamber 10 has two small compartments on the left and right of the front seat portion and the rear seat portion, and this small compartment is a passage. Are connected to each other, the restriction portion 8 is formed near the center of the small compartment of the front seat portion, and the length of the sub chamber portion 6 is about half the horizontal length of the main chamber portion 5. This is different from that according to the first embodiment in that the fixing portion 15 is configured to coincide with the fixing portion 16 b formed on the left side of the center of the main chamber portion 5. Even with this configuration, the curtain airbag can achieve the same functions and effects as those of the first embodiment.

  FIG. 10 is a schematic plan view of a curtain airbag according to the third embodiment of the present invention. Since the configuration of the curtain airbag according to the third embodiment is basically the same as that according to the first embodiment described above, differences will be mainly described.

  As shown in FIG. 10, the curtain airbag according to the third embodiment is that the restriction portion 8 that extends linearly from the vicinity of the connecting portion 13 toward the main chamber portion 5 is intermittently formed. It differs from that of the first embodiment. Even with this configuration, the curtain airbag can achieve the same functions and effects as those of the first embodiment. In this case, the number of non-joined portions forming the intermittent portion of the restricting portion 8 is not particularly limited, and the ratio of the joined portions and the non-joined portions in the restricting portion 8 is not particularly limited.

  FIG. 11 is a schematic plan view showing a state before the curtain airbag according to the fourth embodiment of the present invention is folded, FIG. 12 is a YY sectional view of FIG. 11, and FIG. FIG. 14 is a view showing a state in which the curtain airbag of FIG. 11 is folded in three, and FIG. 14 is a cross-sectional view taken along line YY of FIG. Since the configuration of the curtain airbag according to the fourth embodiment is basically the same as that according to the first embodiment described above, differences will be mainly described.

  As shown in FIG. 11, the airbag body 1 extends obliquely from the connecting portion 13 and at a point where the distance from the connecting portion 13 to the fixing portion 15 is shorter than the distance from the connecting portion 13 to the fixing portion 16a. The point which is formed so that the width | variety of the control part 8 spreads toward the connection part 13 differs from the thing by 1st Embodiment. In this case, since the distance from the connecting portion 13 to the fixing portion 15 is shorter than the distance from the connecting portion 13 to the fixing portion 16a, a larger tension is applied in the longitudinal direction of the sub chamber portion 6 of the airbag body 1 during inflation and deployment. It will be. However, by configuring the restricting portion 8 as described above, the base fabrics 2 and 3 in the restricting portion 8 are compressed and contracted during expansion and deployment, and the tension applied to the sub chamber portion 6 is relaxed. Accordingly, the curtain airbag can be inflated and deployed with a more stable shape.

  In the above-described embodiment, the airbag main body is produced by superimposing two base fabrics. However, at least two base fabrics are sufficient, depending on the shape, structure, and required functions. Alternatively, three or more base fabrics can be used in an auxiliary manner.

  In the above embodiment, the shape of the airbag body (or the shape of the base fabric) is substantially rectangular. However, the shape is not limited to this, and the shape and the mounting position of the airbag are not limited thereto. It can be designed accordingly. The shapes of the main chamber and the main chamber can be appropriately designed in the same manner as the airbag body.

  Furthermore, in the above embodiment, the sub chamber portion is formed in a rectangular shape, but the shape of the sub chamber portion is not particularly limited as long as it has a free end extending from the connecting portion and overlaps the regulating portion. It is not something.

  Furthermore, in the above-described embodiment, the restriction portion and the sub chamber portion are each one, but the invention is not limited to this, and a plurality of restriction portions and corresponding sub chamber portions can be provided. Further, the sub chamber portion is not limited to the one formed in the lower portion of the main chamber, and if the main chamber portion is formed so as to extend from the connecting portion with the main chamber portion and have a free end and overlap the restricting portion, It may be formed from the side portion. Similarly, the position of the connecting portion is not limited to the lower part on the front side of the vehicle body, and the sub chamber portion extends from the connecting portion with the main chamber portion, has a free end, and is formed so as to overlap the restricting portion when inflated and deployed. Within the range, it can be provided at any position connected to the main chamber.

DESCRIPTION OF SYMBOLS 1 Airbag main body 2, 3 Base fabric 4 Opening part 5 Main chamber part 6 Sub chamber part 7 Notch 8 Control part 10 Main room 11 Sub chamber 12 Suture thread 13 Connection part 15 Fixing part 16a, 16b Fixing part

Claims (5)

A curtain airbag made by stacking two base fabrics,
A main chamber portion, and a sub chamber portion connected to the main chamber portion, extending from the connecting portion with the main chamber portion and having a free end,
A regulating part that regulates the thickness of the main chamber part is formed so as to extend from the vicinity of the connecting part to the main chamber part side,
It is arranged so that the sub chamber part overlaps the regulation part ,
At the time of expansion and deployment,
The main chamber portion is formed with a concave portion by a restriction portion that restricts expansion,
Subchamber becomes a bar-like, the disposed concave portion, the curtain airbag that complements the outer surface of the regulating portion. The curtain airbag according to claim 1, wherein the regulating portion is joined by stitching and / or adhering two opposing base fabrics together. The curtain airbag according to claim 1 or 2, wherein at least one of the main chamber portion and the sub chamber portion is provided with a fixing portion for fixing the sub chamber portion in a state of being overlapped with the regulating portion. A curtain airbag made by stacking two base fabrics,
A main chamber portion, and a sub chamber portion connected to the main chamber portion, extending from the connecting portion with the main chamber portion and having a free end,
A regulating part that regulates the thickness of the main chamber part is formed so as to extend from the vicinity of the connecting part to the main chamber part side,
It is arranged so that the sub chamber part overlaps the regulation part,
In the vicinity of the free end of the sub chamber portion, there is provided a fixing portion for fixing the sub chamber portion in a state of overlapping with the restriction portion,
Der Luca over ten airbags which the fixing portion is fixed to the fixing portion of the fixing object of the curtain airbag. A production method for producing the curtain airbag according to claim 1,
Cutting two base fabrics to be overlapped to form a main chamber portion and a sub chamber portion connected to the main chamber portion and extending from the connecting portion with the main chamber portion and having a free end;
Forming a main chamber in the main chamber, and forming a sub chamber in the sub chamber connected to the main chamber at the connecting portion;
A step of regulating the thickness of the main chamber portion to form a concave portion in the main chamber portion so as to extend from the vicinity of the connecting portion to the main chamber portion side;
The sub-chamber unit, seen including the step of arranging so as to overlap with the restricting portion,
The incision is formed in a rod shape when the sub chamber portion is expanded, and is formed in parallel along the outer shape of each base cloth so as to be disposed in the concave portion and complement the outer surface of the restricting portion. A method of manufacturing a curtain airbag.

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