JP2007022449A - Side airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a side airbag device excellent in function for protecting a head part of an occupant in a collision from an oblique front side relative to the vehicle. <P>SOLUTION: A sub-chamber formation part Fo is connected to an inner side surface of an upper part So1 of a main chamber formation part So. A part of high pressure gas flowing into the main chamber flows into the sub-chamber in the sub-chamber formation part Fo. After the sub-chamber formation part Fo is folded/bent from a rear side to a front side by a bottom folding line T3, it is folded/bent from a front side to a rear side by a crest folding line Y2. Subsequently, the sub-chamber formation part Fo and the upper part So1 of the main chamber formation part So are vertically bellows-folded by alternate long and short dash lines T4, T5, Y3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a side airbag device including an airbag that is inflated and deployed between a side portion of a vehicle body and an occupant by gas generated from a gas generation source.

This type of side airbag device is disclosed in Patent Document 1, for example. The airbag in the side airbag device disclosed in Patent Document 1 is inflated and deployed on the side of the chest of the occupant and the side of the head. That is, this side airbag device protects the occupant's chest and head against a collision at the side of the vehicle body.
JP-A-10-297409

However, the side airbag device disclosed in Patent Document 1 has an insufficient function of protecting the head of the occupant against a collision from an oblique front against the vehicle.
An object of this invention is to provide the side airbag apparatus excellent in the function which protects a passenger | crew's head with respect to the collision from the diagonal front with respect to a vehicle.

  The present invention is directed to a side airbag device including an airbag that is inflated and deployed between a side portion of a vehicle body and an occupant by a gas generated from a gas generation source. A main chamber forming portion that is inflated and deployed between the side portion of the vehicle body and the occupant, and a sub chamber forming portion that is inflated and deployed in front of the occupant's head in series with the top of the main chamber forming portion. And the sub chamber forming portion is bent in the vertical direction together with the upper portion of the main chamber forming portion after being bent in the front-rear direction.

  When the airbag is inflated and deployed, the sub chamber forming portion is inflated and deployed in front of the occupant's head. That is, the inflated and deployed subchamber forming portion protects the occupant's head from a collision from a diagonal front against the vehicle. Since the sub chamber forming portion is bent in the vertical direction together with the upper portion of the main chamber forming portion after being bent in the front and rear direction, the upper portion of the main chamber forming portion and the sub chamber forming portion are expanded in the vertical direction rather than in the front and rear direction. Is given priority. This is effective in rapidly deploying the airbag in a narrow place between the occupant and the side of the vehicle body.

In a preferred example, the distal end side of the sub chamber forming portion is bent from the inner side to the outer side of the main chamber forming portion.
Here, the inside of the main chamber forming portion is the side opposite to the side of the vehicle body closer to the occupant, and the outside of the main chamber forming portion is the vehicle body closer to the occupant. It is the side of the. The distal end side of the sub chamber forming portion is moved and arranged from the outer side of the main chamber forming portion to the inner side of the main chamber forming portion while inflating, and the head of the occupant is hit by the sub chamber forming portion during expansion and deployment It will never be.

  In a preferred example, the sub chamber forming portion is connected to the inner surface of the main chamber forming portion along the vertical direction of the main chamber forming portion, and the sub chamber forming portion is connected to the main chamber forming portion. It overlaps with the inner side surface, and is then bent toward the outer side of the main chamber forming portion so as to overlap the outer surface of the main chamber forming portion.

  The front end portion of the inflating subchamber forming portion is reversely moved from the outer surface side of the main chamber forming portion to the inner surface side of the main chamber forming portion. It will not be beaten.

  In a preferred example, at least a part of the sub chamber forming portion is overlapped with the main chamber forming portion, and the sub chamber forming portion and the upper portion of the main chamber forming portion are located above and below the main chamber forming portion. The bellows fold portion between the sub chamber forming portion and the main chamber forming portion is bellows folded in the front-rear direction of the main chamber forming portion.

  Since the sub chamber forming portion and the upper portion of the main chamber forming portion are accordion folded in the vertical direction of the main chamber forming portion, the gas pressure of the high pressure gas supplied into the airbag is the upper portion of the main chamber forming portion and Quickly deploy the sub chamber forming part upward.

In a preferred example, the bellows fold portion between the sub chamber forming portion and the main chamber forming portion is inserted into the main chamber by middle folding.
The bellows fold portion between the sub chamber forming portion and the main chamber forming portion that are put in the main chamber is rapidly deployed upward by the gas pressure of the high-pressure gas supplied into the airbag.

  In a preferred example, the upper portion of the main chamber forming portion is cactus-folded in the vertical direction of the main chamber forming portion with the sub chamber forming portion, and the main chamber forming portion is accompanied with the sub chamber forming portion. The upper part of the main chamber forming portion that is cactus folded in the vertical direction is bellows folded in the front-rear direction of the main chamber forming portion.

  The upper portion of the main chamber forming portion that is cactus-folded in the vertical direction of the main chamber forming portion with the sub chamber forming portion is rapidly expanded upward by the gas pressure of the high-pressure gas supplied into the airbag.

  The side airbag device of the present invention has an excellent function of protecting the occupant's head against a collision from an oblique front against the vehicle.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the following description, the front-rear direction is the forward / backward direction of the vehicle, the forward direction is the forward direction of the vehicle, and the rear direction is the reverse direction of the vehicle. The right side means the right side when viewed in the traveling direction of the vehicle, and the left side means the left side when viewed in the traveling direction of the vehicle.

  As shown in FIG. 1, the seat 11 includes a seat portion 111 and a backrest portion 112. The side airbag device 12 is housed in the backrest portion 112 of the seat 11 while being accommodated in the case 13. The side airbag device 12 is provided on the side portion of the backrest portion 112 facing the right side door 10 of the vehicle corresponding to the seat 11. The side airbag device 12 includes an inflator 14 fixed inside the case 13 and a cloth airbag 15 that covers the inflator 14. A gas generating agent (not shown) that generates high-pressure gas is accommodated in the inflator 14. A spout 141 is formed in the inflator 14. The high-pressure gas generated from the gas generating agent is ejected into the airbag 15 via the ejection port 141.

  The vehicle body is provided with an impact sensor (for example, an acceleration detector) (not shown). The impact sensor sends information on impact applied to the vehicle (acceleration information in the case of an acceleration detector) to control means (not shown). The control means operates the inflator 14 when the impact detected by the impact sensor is an impact greater than a predetermined magnitude. That is, when the impact detected by the impact sensor is an impact greater than a predetermined magnitude, high-pressure gas is generated from the gas generating agent. The airbag 15 shown in FIG.1 and FIG.2 shows the state expand | swelled and expanded by the high pressure gas generated from the gas generating agent.

  The airbag 15 is manufactured in the order shown in FIGS. 3 (a), (b), (c), and (d). FIG. 3A shows a basic material 16 in which a cloth (woven cloth in this embodiment) that is a material of the airbag 15 is formed in a predetermined shape. The shape of the one fabric portion 161 of the basic material 16 divided by the one-dot chain line Y1 and the shape of the other fabric portion 162 are symmetric with respect to the valley fold line T1. That is, the basic material 16 has a symmetrical shape.

  FIG. 3B shows a state where the fabric portion 161 is valley-folded along a valley fold line T1 indicated by a one-dot chain line in FIG. Reference numeral 17 shown in FIG. 3B denotes a seam portion obtained by sewing a folded piece 18 obtained by bending the fabric portion 161 along the valley fold line T1 to the remaining fabric portion 161 (hereinafter referred to as the base portion 21) with a thread. FIG. 3C shows a state in which the basic material 16 is mountain-folded along the alternate long and short dash line Y1 in FIG. FIG. 3D shows a state where the fabric portion 162 is valley-folded along a valley fold line T2 indicated by a one-dot chain line in FIG. The bent piece 19 obtained by bending the cloth portion 162 at the valley fold line T <b> 2 is superposed on the bent piece 18. The remaining fabric portion 162 (hereinafter referred to as the base portion 22) other than the folded piece 19 obtained by folding the fabric portion 162 along the valley fold line T2 overlaps the base portion 21.

  3 and 24 shown in FIG. 3D are seam portions obtained by sewing the peripheral portions of the overlapped fabric portions 161 and 162 with a thread. Reference numerals 25 and 26 shown in FIG. 3D denote seam portions in which the vicinity of the middle portion of the bent end portion 20 of the folded pieces 18 and 19 is sewn to the superposed base portions 21 and 22 with a thread. Reference numerals 27 and 28 shown in FIG. 3D denote seam portions obtained by stitching the overlapped base portions 21 and 22 together. FIG.3 (e) shows the state which looked at the airbag 15 shown in FIG.3 (d) from the back side.

  The seam portion 23, the bent end portion 20, the seam portion 27, and the base portions 21 and 22 form a main chamber S (shown in FIG. 2) between the overlapped base portions 21 and 22. Hereinafter, the overlapped base portions 21 and 22 are referred to as a main chamber forming portion So. The seam portion 25, the bent end portion 20, and the bent pieces 18, 19 form a sub chamber F (shown in FIG. 2) between the folded bent pieces 18, 19. Hereinafter, the overlapped bent pieces 18 and 19 are referred to as a sub chamber forming portion Fo. The sub chamber forming portion Fo is connected to the inner surface (surface on the base 21 side) of the upper portion So1 of the main chamber forming portion So, and the sub chamber forming portion Fo is located between the leading edge 29 and the valley fold line T3. F1 overlaps the inner side surface (the surface of the base portion 21) of the main chamber forming portion So. The high-pressure gas generated in the inflator 14 flows into the main chamber S via the jet outlet 141. A part of the high-pressure gas flowing into the main chamber S flows into the sub chamber F via the bent end portion 20.

The side airbag provided on the left seat of the vehicle body has a configuration in which the view of the airbag 15 shown in FIGS. 3D and 3E is reversed left and right on FIGS. 3D and 3E.
The airbag 15 manufactured as shown in FIGS. 3D and 3E is folded in the order shown in FIGS. 4, 5, 6, 6, and 7. FIG. 4A shows a state in which the folded pieces 18 and 19 (sub-chamber forming portion Fo) overlapped are folded at a valley fold line T3 indicated by a one-dot chain line in FIG. That is, the sub chamber forming portion Fo is bent from the rear side to the front side at the valley fold line T3. The seam portion 27 defines a limit position of the valley fold line T3, and the valley fold line T3 does not enter the inside of the seam portion 27 (between the seam portion 27 and the bent end portion 20). FIG. 4B shows a state where the airbag 15 shown in FIG. 4A is viewed from the back side.

  FIG. 5A shows a state in which the sub chamber forming portion Fo is folded at a mountain fold line Y2 indicated by a one-dot chain line in FIG. 4A. That is, the sub chamber forming portion Fo is bent from the front side to the rear side along the mountain fold line Y2. That is, in the sub chamber forming portion Fo, the region F2 between the valley fold line T3 and the mountain fold line Y2 overlaps the inner side surface (the surface of the base portion 21) of the main chamber forming portion So, and the mountain fold line Y2 A region F3 between the main chamber forming portion So and the distal end edge 29 of the sub chamber forming portion Fo overlaps the outer surface (surface of the base portion 22) of the main chamber forming portion So. FIG.5 (b) shows the state which looked at the airbag 15 shown to Fig.5 (a) from the back side. FIG. 5C is a simplified view of the airbag 15 shown in FIGS. 5A and 5B as viewed from above.

  FIG. 6 (a) shows the airbag 15 taken along alternate long and short dash lines T4, T5, and Y3 passing through the overlapping portion 30 between the bent pieces 18 and 19 (sub chamber forming portion Fo) and the base portions 21 and 22 (main chamber forming portion So). The upper part (the upper part So1 of the sub chamber forming part Fo and the main chamber forming part So) is shown in a state of being bellows folded in the vertical direction. In the present embodiment, the upper part So1 of the main chamber forming part So means an upper side of the connecting part 163 that stands vertically between the base part 21 and the base part 22 in FIGS. Overlapping portion 30 is folded at valley fold lines T4 and T5, and is folded at mountain fold line Y3. That is, the sub chamber forming portion Fo is bent in the vertical direction together with the upper portion So1 of the main chamber forming portion So after being bent in the front-rear direction. The alternate long and short dash lines T4, T5, and Y3 are substantially parallel to each other, and the alternate long and short dash lines T4, T5, and Y3 are substantially orthogonal to the connecting portion 163 (mountain fold line Y1) between the base portion 21 and the base portion 22. FIG. 6B shows a state where the airbag 15 of FIG. 6A is viewed from the back side. FIG. 6C is a simplified cross-sectional view taken along line BB in FIG.

  FIGS. 7A and 7B show a state in which the airbag 15 is folded halfway along alternate long and short dash lines C1, C2, C3, and C4 that pass through the overlapping portion 30 shown in FIGS. 6A and 6B. FIG.7 (b) shows the state which looked at the airbag 15 of Fig.7 (a) from the back side. The base portion 21 in the bellows fold portion 31 obtained by bellowing the sub chamber forming portion Fo and the upper portion So1 of the main chamber forming portion So is valley-folded by a one-dot chain line C1 shown in FIG. 6A and mountain-folded by a one-dot chain line C2. . The base portion 22 of the bellows fold portion 31 is valley-folded along the alternate long and short dash line C3 shown in FIG. FIG. 7C is a simplified cross-sectional view taken along line CC in FIG. A part of the bellows fold portion 31 is inserted into the main chamber S by middle folding.

  As shown in FIGS. 7A and 7B, the airbag 15 in which a part of the bellows fold portion 31 is inserted into the main chamber S is indicated by alternate long and short dashed lines T6, T7, T8, T9, Y4, Y5, Y6. , Y7, Y8 are folded in the front-rear direction. In the present embodiment, the alternate long and short dash lines T6, T7, T8, and T9 are valley fold lines, and the alternate long and short dash lines Y4, Y5, Y6, Y7, and Y8 are mountain fold lines. The alternate long and short dash lines T6, T7, T8, T9, Y4, Y5, Y6, Y7, and Y8 are substantially parallel to each other and substantially parallel to the connecting portion 163 (mountain fold line Y1) between the base portion 21 and the base portion 22. is there. That is, the alternate long and short dash lines T6, T7, T8, T9, Y4, Y5, Y6, Y7, and Y8 are substantially orthogonal to the alternate long and short dash lines T4, T4, and T3.

  FIG. 7D is a simplified diagram showing an airbag (hereinafter referred to as an airbag 15J) in which the airbag 15 shown in FIGS. 7A, 7B, and 7C is accordion-folded. The airbag built in the backrest portion 112 of the seat 11 is an airbag 15J shown in FIG.

  The high-pressure gas generated in the inflator 14 flows from the outlet 141 into the main chamber S of the airbag 15J accommodated in the case 13. The high-pressure gas that has flowed into the main chamber S attempts to expand the bellows-folded portion of the airbag 15J that is bellows-folded in the front-rear direction so as to extend forward, and the bellows-folding portion 31 that is folded into the main chamber S. To expand upward. As a result, the bellows folded portion that is folded in the front-rear direction of the airbag 15J is expanded so as to extend forward, and the bellows folded portion 31 is expanded so as to extend upward. Part of the high-pressure gas that has entered the bellows fold portion 31 enters the sub chamber F. Since the sub chamber forming portion Fo is bent from the surface side of the base portion 21 to the surface side of the base portion 22 through the front side of the bent end portion 20, the inflow of the high pressure gas from the main chamber S to the sub chamber F is Occurs only after the bellows fold 31 has developed considerably. That is, the upward deployment of the airbag 15J is preferentially performed over the deployment of the sub chamber F.

  As shown in FIG. 2, the main chamber forming portion So is deployed between the occupant P seated on the seat 11 and the side door 10 that is a side portion of the vehicle body. The sub chamber forming portion Fo is deployed obliquely in front of the head H of the occupant P. The base 21 is on the passenger P side, and the base 22 is on the side door 10 side corresponding to the seat 11. The main chamber forming part So protects the abdomen, chest, shoulder and head H of the occupant P, and the sub chamber forming part Fo protects the head H of the occupant P.

In the first embodiment, the following effects can be obtained.
(1) The main chamber forming portion So also protects the head H of the occupant P from a collision at the side of the vehicle, but the sub chamber forming portion Fo deployed obliquely in front of the head H of the occupant P is oblique to the vehicle. The head H of the occupant P is protected from a collision from the front. That is, the airbag 15 including the sub chamber forming portion Fo protects the head H of the occupant P as compared with an airbag having only the main chamber forming portion So (corresponding to the airbag disclosed in Patent Document 1). Excellent function.

  (2) The gap between the body part below the occupant P's neck and the side door 10 is narrow. If the deployment of the sub chamber forming portion Fo is prioritized over the deployment of the airbag 15 in the vertical direction, the sub chamber forming portion Fo is located in a narrow space between the body part below the neck of the passenger P and the side door 10. Try to expand and deploy. As a result, this hinders rapid completion of the airbag 15 deployment.

  The structure in which the sub chamber forming portion Fo is folded in the front-rear direction along the alternate long and short dash line T3, Y2, and then the sub chamber forming portion Fo is folded along with the upper portion So1 of the main chamber forming portion So in the up and down direction along the alternate long and short dash line T4, T5, Y3. This is effective in delaying the inflow of the high-pressure gas from the chamber S to the sub chamber F and giving priority to the expansion and expansion of the main chamber formation portion So over the expansion of the sub chamber formation portion Fo. That is, the structure in which the inflow of the high-pressure gas from the main chamber S to the sub chamber F is delayed so that the inflation and deployment above the main chamber formation portion So has priority over the deployment of the sub chamber formation portion Fo is the deployment of the airbag 15. Effective for expediting completion.

  (3) A part of the sub chamber forming portion Fo (region F3 between the mountain fold line Y2 and the leading edge 29 of the sub chamber forming portion Fo) is expanded outward (base portion 21) while expanding. From the front surface side) to the inner side of the main chamber forming portion So (the front surface side of the base portion 22). Accordingly, the head H of the occupant P is not hit by the sub-chamber forming portion Fo that is inflated and deployed.

  (4) The sub chamber forming portion Fo (the bent pieces 18 and 19) is bent so as to be in contact with the surface of the base 21 at the bent end portion 20 (the bent piece 18 is in contact with the surface of the base 21). Such a bending configuration is effective in delaying the inflow of the high-pressure gas from the main chamber S to the sub chamber F and giving priority to the expansion and deployment above the main chamber forming portion So.

  (5) Of the sub chamber forming portion Fo, the region F2 between the valley fold line T3 and the mountain fold line Y2 is on the surface side of the base 21, and the mountain fold line Y2 and the leading edge 29 of the sub chamber forming portion Fo. A region F3 between the base portion 22 and the base portion 22 is on the surface side. Such a bending structure is effective in delaying the expansion and deployment of the sub chamber forming portion Fo and giving priority to the expansion and deployment of the main chamber forming portion So.

  (6) The bellows fold portion 31 includes a sub chamber forming portion Fo. The sub chamber forming portion Fo that is partially bent from the inner side to the outer side of the main chamber forming portion So is folded together with the upper portion So1 of the main chamber forming portion So in the sub chamber forming portion Fo. This is effective in delaying the expansion and expansion of the main chamber and giving priority to the expansion and expansion upward of the main chamber forming portion So.

  (7) The overlapping portion 30 of the main chamber forming portion So and the sub chamber forming portion Fo overlapping the sub chamber forming portion Fo is bellows folded in the vertical direction of the main chamber forming portion So. The high-pressure gas that has entered the bellows fold portion 31 rapidly inflates and expands the bellows fold portion 31 upward, and the main chamber forming portion So rapidly inflates and expands upward. The bellows fold portion 31 includes the sub chamber forming portion Fo folded in the front-rear direction, so that the upward expansion of the main chamber forming portion So has priority over the expansion and expansion of the sub chamber forming portion Fo. Done. The configuration in which the overlapping portion 30 is bellows folded in the vertical direction of the main chamber forming portion So is a simple bending configuration in order to prioritize the upward development of the main chamber forming portion So over the expansion and expansion of the sub chamber forming portion Fo. is there.

  (8) The overlapped portion 30 (the bellows fold portion 31) of the sub chamber forming portion Fo and the main chamber forming portion So folded into the main chamber S is folded by a middle fold. The configuration in which the bellows fold portion 31 is inserted into the main chamber S by middle folding is effective in making the folded airbag 15J compact and rapidly deploying the main chamber forming portion So upward. Moreover, the middle folding is a simple folding configuration when the bellows folding part 31 is inserted into the main chamber S.

In the present invention, the following embodiments are also possible. In the following embodiments, the same reference numerals are used for the same components as those in the first embodiment.
-As shown to Fig.8 (a), (b), you may fold the overlap part 30 by cactus. A part of the cactus folded part 32 obtained by cactus folding the overlapping part 30 is inserted into the main chamber S. Also in this embodiment, the same effect as the first embodiment can be obtained.

  -In embodiment of FIG. 9, the area | region F4 of the front end side of the subchamber formation part Fo is bent from the inner side of the main chamber formation part So to the outer side. That is, the region F4 on the front end side of the sub chamber forming portion Fo is bent from the front side to the rear side, and the bent region F4 is overlapped with the sub chamber forming portion Fo itself. The overlapping portion 30 is accordion folded in the vertical direction as in the first embodiment.

  In the embodiment of FIG. 10, the region F5 on the distal end side of the sub chamber forming portion Fo is bent from the inner side to the outer side of the main chamber forming portion So. That is, the front end side region F5 of the sub chamber forming portion Fo is bent from the front side to the rear side, and the bent region F5 is folded between the region F1 and the region F2 of the sub chamber forming portion Fo. Yes. The overlapping portion 30 is accordion folded in the vertical direction as in the first embodiment.

  In the embodiment of FIG. 11, the region F6 on the tip side of the sub chamber forming portion Fo is bent from the outer side to the inner side of the main chamber forming portion So. That is, the front-side region F6 of the sub chamber forming portion Fo is bent from the front side to the rear side, and the bent region F6 is overlapped with the region F2 of the sub chamber forming portion Fo. The overlapping portion 30 is accordion folded in the vertical direction as in the first embodiment.

  In the embodiment of FIG. 12, a region F7 connected to the region F3 on the distal end side of the sub chamber forming portion Fo is bent from the inner side to the outer side of the main chamber forming portion So. That is, the region F7 on the front end side of the sub chamber forming portion Fo is bent from the rear side to the front side, and the bent region F7 is overlapped with the region F3 of the sub chamber forming portion Fo. The overlapping portion 30 is accordion folded in the vertical direction as in the first embodiment.

10 to 12, the overlapping portion 30 may be inserted into the main chamber S by cactus folding.
In the first embodiment, all of the bellows fold portion 31 may enter the main chamber S.

  As shown in FIG. 13, the alternate long and short dash lines T <b> 4, T <b> 5, Y <b> 3 may be inclined with respect to the connecting portion 163 between the base portion 21 and the base portion 22. That is, the angle α formed by the alternate long and short dash lines T4, T5, Y3 and the connecting portion 163 may be in the range of 60 ° to 120 °, for example.

  As shown in FIG. 14, the alternate long and short dash lines T 6, T 7, T 8, T 9, Y 4, Y 5, Y 6, Y 7, Y 8 may be inclined with respect to the connecting portion 163 between the base portion 21 and the base portion 22. That is, the angle β formed by the alternate long and short dash lines T6, T7, T8, T9, Y4, Y5, Y6, Y7, Y8 and the connecting portion 163 is, for example, −45 ° to + 45 ° (0 ° when orthogonal) ).

  The one-dot chain lines T4, T5, Y3 and the one-dot chain lines T6, T7, T8, T9, Y4, Y5, Y6, Y7, Y8 do not have to be orthogonal. That is, the angle formed by the one-dot chain lines T4, T5, Y3 and the one-dot chain lines T6, T7, T8, T9, Y4, Y5, Y6, Y7, Y8 is, for example, −30 ° to + 30 ° (0 when orthogonal) Within the range of (°).

  In each of the above-described embodiments, after the bellows fold portion 31 or the cactus fold portion 32 is inserted into the main chamber S, the main chamber forming portion So is rolled from the front side to the rear side together with the bellows fold portion 31 or the cactus fold portion 32. It may be folded. In this case, the folding direction of the roll fold is preferably a direction from the inner side of the main chamber forming portion So to the outer side (from the vehicle interior side to the vehicle outer side), but the outer side of the main chamber forming portion So. The direction from the vehicle to the inward side (from the outdoor side of the vehicle to the indoor side) may be used. In the configuration in which the main chamber forming portion So is folded from the inner side to the outer side of the main chamber forming portion So (from the vehicle interior side to the outdoor side), the roll-folded airbag is deployed forward. At that time, the roll folding is unraveled on the door trim side, so that the air bag surface on the passenger side smoothly spreads forward in the vehicle. Therefore, the airbag can be smoothly deployed between the passenger and the door trim, and the airbag softly restrains the passenger.

The side view which shows 1st Embodiment. AA sectional view taken on the line AA of FIG. (A), (b), (c), (d), (e) is a side view explaining manufacture of an airbag. (A), (b) is a side view explaining the bending method of a subchamber formation part. (A), (b) is a side view explaining the bending method of a subchamber formation part. FIG. 5C is a simplified plan view of FIG. (A), (b) is a side view explaining the bending method of the overlap part containing a subchamber formation part. (C) is the BB sectional drawing of Fig.6 (a). (A), (b) is a side view explaining the bending method of the main chamber formation part which inserted the bellows fold part. (C) is CC sectional view taken on the line of Fig.7 (a). (D) is a simplified side view showing a folded airbag. Another embodiment is shown, (a) is a side view. (B) is the DD sectional view taken on the line of Fig.8 (a). The simplified top view which shows another embodiment. The simplified top view which shows another embodiment. The simplified top view which shows another embodiment. The simplified top view which shows another embodiment. The side view which shows another embodiment. The side view which shows another embodiment.

Explanation of symbols

  10: A side door which is a side part of the vehicle body. 12: Side airbag device. 14: An inflator as a gas generation source. 15,15J ... Airbag. 30 ... Overlapping part. 31 ... Bellows fold. S ... Main room. So: Main chamber forming part. So1 ... Upper part. Fo: Sub chamber forming section. P ... Crew. H ... Head.

Claims (6)

In a side airbag device including an airbag that is inflated and deployed between a side portion of a vehicle body and an occupant by gas generated from a gas generation source,
The airbag includes a main chamber forming portion that is inflated and deployed between a side portion of a vehicle body and an occupant, and a subchamber formation that is inflated and deployed in front of the occupant's head in a row above the main chamber forming portion. The sub-chamber forming portion is bent in the front-rear direction and then bent in the vertical direction together with the upper portion of the main chamber forming portion.   The airbag device according to claim 1, wherein a distal end side of the sub chamber forming portion is bent from an inner side to an outer side of the main chamber forming portion.   The sub chamber forming portion is connected to the inner surface of the main chamber forming portion along the vertical direction of the main chamber forming portion, and the sub chamber forming portion overlaps the inner surface of the main chamber forming portion, The airbag device according to claim 2, wherein the airbag device is bent toward an outer side of the main chamber forming portion and overlaps an outer surface of the main chamber forming portion.   At least a part of the sub chamber forming portion is overlapped with the main chamber forming portion, and the sub chamber forming portion and the upper portion of the main chamber forming portion are bellows folded in the vertical direction of the main chamber forming portion. 4. The bellows fold portion between the sub chamber forming portion and the main chamber forming portion is bellows folded in the front-rear direction of the main chamber forming portion. 5. Airbag device.   The airbag device according to claim 4, wherein the bellows fold portion between the sub chamber forming portion and the main chamber forming portion is inserted into the main chamber by a middle fold.   The upper part of the main chamber forming part is cactus folded in the vertical direction of the main chamber forming part with the sub chamber forming part, and the cactus in the vertical direction of the main chamber forming part with the sub chamber forming part. The airbag apparatus according to any one of claims 1 to 3, wherein an upper portion of the folded main chamber forming portion is bellows folded in the front-rear direction of the main chamber forming portion.

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