JP2010070178A - Side airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a side airbag device enhancing the speed of deployment toward the forefront of an airbag. <P>SOLUTION: A folding of a first folded part 41 is maintained all the while in inflating and deploying an airbag 24 because the airbag 24 is folded back along a first folding line (trough-folding line) 31 that is set as a straight line inclining upward to have an angle α relative to a base end edge of the airbag 24 from the vicinity of the center of the base end edge in a first folding process. Therefore, expansion gas flows toward the forefront of the airbag 24 along the first folding line 31 until the folding in second to sixth folding processes is released. Thus, the expansion gas flows toward the forefront more preferentially than the first folded part 41 formed on the upper portion on a base end side of the airbag 24, thereby enhancing the speed of deployment toward the forefront of the airbag and restraining a passenger quickly. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a side airbag device that is arranged on a vehicle seat and arranges an airbag between a vehicle inner wall and an occupant during inflation and deployment.

  2. Description of the Related Art Conventionally, an airbag apparatus that deploys an airbag and protects an occupant in the event of a frontal collision of an automobile has been put into practical use. In recent years, apart from such an airbag device, a side airbag device that protects an occupant against a collision from the side of the vehicle body, that is, a side collision has been proposed and put into practical use. In this side airbag device, a side-impact airbag (side airbag) is inflated and deployed between the occupant and the side of the vehicle body in the event of a side collision. It protects against pressure. Such a side airbag device is generally installed on a seat back side, a vehicle door, or the like. For example, a configuration of the side airbag device described in Patent Document 1 is known.

  As shown in FIG. 9, the side airbag device 51 of the above document is installed in an opening 53 formed on a side portion of the seat back 52 a of the vehicle seat 52 that is outside the vehicle body. The seat back 52a and its opening 53 are covered with a cloth cover 59. The side airbag device 51 includes an airbag 54 that is formed in a bag shape and is normally held in a folded state, an inflator 55 that generates inflation gas that inflates and deploys the airbag 54, and the inflator 55. And a retainer 65 fixed in the vicinity of the opening 53 of the seat back 52a. As shown in FIG. 10A, the airbag 54 is formed in a bag shape by connecting peripheral ends of a pair of substantially semicircular cloths. A retainer 65 is provided at a lower portion on the proximal end side inside the airbag 54.

  As described above, the airbag 54 is folded and stored in the opening 53 during normal times (when not inflated and deployed). For example, the airbag 54 is folded as follows. As shown in FIG. 10A, first, a folding line extending from the proximal end side of the airbag 54 to the distal end side (hereinafter referred to as “distal direction”), that is, the area of the airbag 54 is vertically divided into approximately two equal parts. The airbag 54 is folded back along the fold line (valley fold line) 60. Next, as shown in FIG. 10 (b), the airbag 54 extends in a direction perpendicular to the distal end direction, and in the distal end direction, a mountain fold line 61 and a valley fold line 62 are alternately set at predetermined intervals. Folded along. Thereby, as shown in FIG.10 (c) and FIG.10 (d), the airbag 54 is folded by the bellows shape in the left-right direction in a figure.

The airbag 54 folded in this way is inflated and deployed when an impact exceeding a predetermined value is detected by a collision sensor or the like (not shown). That is, an ignition current is supplied to the inflator 55 and the gas generating agent is ignited, and the gas generated by the combustion increases the internal pressure of the airbag 54 and starts inflating and deploying. At this time, the airbag 54 is expanded from the rear side to the front side with respect to the front end direction, that is, the traveling direction of the vehicle, and at the same time inflates in the width direction, that is, the vertical direction with respect to the traveling direction of the vehicle. The airbag 54 is also inflated in the thickness direction perpendicular to the width direction and the front end direction, that is, from the vehicle body side wall 56 side toward the passenger 57 side. Then, as indicated by a two-dot chain line in FIG. 9, the airbag 54 breaks the cover 59 in the vicinity of the opening 53 of the seat back 52 a and bulges outside, and is seated on the inner surface of the vehicle body side wall 56 and the seat 52. It expands in the space between the passenger 57. Thereby, the impact when the occupant 57 collides with the vehicle body side wall 56 can be absorbed by the airbag 54.
JP 2006-088851 A

  In such an airbag device, it is necessary to quickly deploy the airbag and restrain the occupant. In particular, the space where the deformation of the vehicle body side wall 56 such as a side door is allowed is smaller than the allowable deformation amount of the front portion of the vehicle body provided with the engine room. Therefore, in the side airbag device 51 that protects the occupant from the impact at the time of a side collision, it is necessary to protect the occupant 57 by deploying the airbag 54 earlier. However, in the conventional general airbag 54 including the one folded in a bellows shape, the internal pressure of the airbag 54 increases and expands from the proximal end side toward the distal end side. For this reason, the inflation and deployment on the distal end side of the airbag 54 is delayed as compared with the proximal end side. Although it is conceivable to increase the amount of inflation gas generated in order to improve the deployment speed of the airbag, there is a concern that the size of the inflator will increase. We want to avoid increasing the size of the inflator from the viewpoint of mountability. For this reason, although it is desirable that the amount of gas generated by the inflator be about the conventional level, in this case, there is a limit to the amount of gas generated, and thus the deployment speed of the airbag is naturally limited.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a side airbag device in which the deployment speed in the distal direction of the airbag is improved.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
According to a first aspect of the present invention, there is provided an airbag that is accommodated in an accommodating state provided in a side portion of a seat back so as to be inflatable and deployable from a proximal end side toward a distal end side thereof, and the airbag And a retainer that is fixed to the housing portion in a state in which an inflator that generates inflation gas supplied to the inside of the airbag is housed, and in the event of a vehicle collision, the inflator When the generated inflation gas is supplied to the inside of the airbag, the airbag is inflated from the housing portion and deployed in a space between the side wall of the vehicle and the occupant, and the occupant is expanded by the deployed airbag. A side airbag device for protecting the airbag, wherein a portion of the base end side of the airbag is folded back obliquely with respect to a direction from the base end side to the front end side of the airbag. By comprising folded folding or winding toward the distal end side of the airbag toward the proximal end side is set to its gist.

  According to this configuration, after a part of the base end side of the airbag is folded back obliquely with respect to the direction from the base end side to the front end side of the airbag, the airbag is moved from the front end side to the base end side. Folded or rolled up. Therefore, when the airbag is inflated and deployed, after the airbag is deployed from the proximal end side to the distal end side, a portion folded back obliquely is deployed. For this reason, the inflation gas is not supplied to the folded portion until the folded portion is released, and the gas is preferentially inflated to the front end side of the airbag along the folded portion. Gas flows. Thereby, the deployment speed to the front end side of the airbag can be increased, and the occupant can be restrained more quickly.

  According to a second aspect of the present invention, in the side airbag device according to the first aspect, the airbag is folded back obliquely and further along a fold line extending from the base end portion toward the distal end portion. The gist is that the airbag is folded or folded from the distal end side toward the proximal end side in the folded state.

  According to this configuration, the airbag is folded or folded along the folding line extending from the base end portion toward the tip end portion. Therefore, the airbag in the folded state can be made compact in the direction perpendicular to the folding line.

  The gist of the invention described in claim 3 is that, in the side airbag device according to claim 1 or 2, the airbag is folded so as not to overlap the retainer.

  According to this configuration, since the airbag is folded so as not to overlap the retainer in all folding, an increase in thickness caused by overlapping the folded portion around the retainer can be suppressed. Thereby, an airbag can be accommodated in a compact state.

  Invention of Claim 4 WHEREIN: In the side airbag apparatus as described in any one of Claims 1-3, it has arrange | positioned the said retainer below or above the center of the base end edge of the said airbag. This is the gist.

  According to this configuration, by arranging the retainer above or below the center on the base end side, it is possible to provide a large folded portion while preventing the airbag from overlapping the retainer when folded obliquely. Thereby, since the area of the airbag other than the portion where the airbag is folded back becomes relatively small, the inflation and deployment other than the portion where the airbag is folded back can be made faster.

  According to a fifth aspect of the present invention, in the side airbag device according to any one of the first to fourth aspects, the thickness of the folded airbag is approximately the same as the dimension of the retainer in the thickness direction. The gist is to become.

  According to this configuration, the thickness of the folded airbag is approximately the same as the dimension of the retainer in the thickness direction, so that the retainer and the airbag form one substantially rectangular parallelepiped shape, and the packaging characteristics of the side airbag device Can be increased.

  According to a sixth aspect of the present invention, in the side airbag device according to any one of the first to fifth aspects, an opening is provided in an obliquely folded portion of the airbag. It is a summary.

  According to this configuration, the airbag is unfolded at a portion folded obliquely after being deployed from the proximal end side to the distal end side as the internal pressure increases. At this time, even if the supply of the inflation gas from the inflator into the airbag continues, a part of the inflation gas in the airbag is discharged to the outside by opening the opening provided in the folded portion. Therefore, an excessive increase in the internal pressure of the airbag can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the side airbag apparatus which improved more the deployment speed to the front-end | tip direction of an airbag can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In the description of the embodiment, the traveling direction of the vehicle is forward. Unless otherwise specified, the vertical direction and the horizontal direction in the following description are the same as the vertical direction and the horizontal direction in the vehicle traveling direction. Seats are arranged side by side in the vehicle interior. As shown in FIG. 1, for example, the right seat 21 includes a stool portion 21 a and a backrest portion 21 b. A seat opening 21h is provided as an accommodating portion on the vehicle exterior side (right side) of the seat back portion 21b. The sheet opening 21 h is covered with a cloth cover 28 that is the skin of the sheet 21. A side airbag device 22 is fixed inside the seat opening 21h via a frame 18 made of a metal material. The side airbag device 22 is disposed so as to correspond to a door (not shown) that constitutes a part of the body side portion of the vehicle. Note that the left side seat (not shown) is also equipped with the same side airbag device 22 on the left side of the backrest portion 21b as with the right side seat 21. The side airbag device 22 operates when an impact of a predetermined value or more is detected by a collision sensor (not shown) provided in the vehicle. And as shown in FIG. 2, the airbag 24 with which the side airbag apparatus 22 is provided fractures | ruptures the cover 28 from the seat opening part 21h, and is between the crew member P seated on the vehicle body side part and the seat 21. Inflates and expands toward

Next, the side airbag device 22 will be described in detail.
As shown in FIG. 3, the side airbag device 22 includes an inflator 25 that generates inflation gas, and an airbag 24 that is normally held in a folded state and is expanded and inflated by supplying inflation gas through the inflator 25. And a retainer 26 fixed to the frame 18 in a state where the inflator 25 is accommodated.

  As shown in FIG. 4, the airbag 24 includes a first base cloth 24 a that faces the door during inflation and deployment, and a second base cloth 24 b that faces the occupant P. The first base fabric 24a and the second base fabric 24b are formed of a woven fabric or the like, and are integrally formed with a base end edge (rear end edge). The airbag 24 is formed into a bag shape by sewing the peripheral portions of the first base fabric 24a and the second base fabric 24b with the thread 13 (see FIG. 2). The airbag 24 is not rectangular as a whole, and the tip edge is formed in an arc shape (see FIG. 3). A first bag opening 24d into which the retainer 26 is inserted is provided as a part that is not partly sewn at the lower end of the airbag 24 on the proximal end side. Further, as shown in an enlarged view in the circle of the alternate long and short dash line in FIG. 3, a second bag opening 27 is provided at the upper part of the base edge of the airbag 24 by cutting a part thereof. .

  Further, as shown in FIG. 4, two through holes 24 h are provided in parallel in the direction (vertical direction) along the base edge at the lower part of the base edge of the airbag 24. A pair of bolts 26b provided on the side surface on the vehicle rear side of the rectangular tubular retainer 26 inserted from the first bag opening 24d is passed through the through holes 24h from the inside of the airbag 24. As shown in FIG. 3, the pair of bolts 26b are inserted from the inside into the insertion holes 18h formed in the frame 18, and the retainer 26 and the airbag 24 are screwed onto the bolts 26b by nuts 29. The frame 18 is fixed. As described above, the inflator 25 is accommodated in the retainer 26. The upper part of the inflator 25 slightly protrudes from the upper surface of the retainer 26, and inflation gas is jetted into the airbag 24 from the protruding gas ejection part 14.

  By the way, as described above, the airbag 24 is accommodated in the seat opening 21h in a normally folded state, and starts to expand and deploy when gas is supplied from the inflator 25 (more precisely, the gas ejection portion 14). To do. At this time, it is necessary to fold the airbag 24 so that the airbag 24 can be smoothly deployed.

  Then, next, the folding method of this airbag 24 is demonstrated in detail, referring FIG. 5 (a)-FIG.5 (f). The method for folding the airbag 24 includes first to sixth folding steps.

  First, in the first folding step (oblique folding step), as shown in FIG. 5A, the rear end upper portion of the airbag 24 is folded obliquely toward the front end lower portion. More specifically, after the airbag 24 along a first fold line (valley fold line) 31 that is set as a straight line that tilts upward from the vicinity of the center of the base edge of the airbag 24 with respect to the base edge. The first folded portion 41, which is the upper part on the end side, is folded back to the vehicle outer side (front side of the page). On the upper side of the folded airbag 24, a hypotenuse 41s inclined by an angle α with respect to the direction along the base edge of the airbag 24 is formed. At this time, the first folding line (valley folding line) 31 is set so that the first folding part 41 does not overlap the retainer 26. In this example, at the rear end edge of the airbag 24 before the first folding step, the side 41h corresponding to the first folded portion 41 passes through the vicinity of the center of the base end edge of the airbag 24 and is orthogonal to the base end edge. Is folded so as to coincide with the second fold line (valley fold line) 32 set as a straight line. The first folded portion 41 is provided with the second bag opening 27 described above, and the folding of the first folded portion 41 makes it difficult for inflation gas to be released from the second bag opening 27 to the outside. Yes.

  Next, in the second folding step, as shown in FIG. 5 (b), the airbag 24 forms the second fold line (valley fold) 32 of the airbag 24 along the aforementioned second fold line (valley fold line) 32. The second folded portion 42, which is the upper portion serving as the boundary, is folded back to the outside of the vehicle. The second folded portion 42 includes a first folded portion 41. The upper side of the airbag 24 in which the second folded portion 42 is folded is a straight side 42t that is perpendicular to the direction along the base edge of the airbag 24. At this time, since the first folded portion 41 corresponding to the retainer 26 is folded at the first folding line (valley folding line) 31, the second folded portion 42 does not overlap the retainer 26. Therefore, the hypotenuse 41s does not intersect the retainer 26.

  In the third folding step, as shown in FIG. 5C, a third folding line (valley folding line) 33 is set as a straight line that bisects the second folded portion 42 vertically and is orthogonal to the base edge. Only the lower end 43 of the second folded portion 42 is folded outward along the vehicle. As shown in FIG. 5D, the lower side 43 h of the second folded portion 42 coincides with the straight side 42 t of the airbag 24 folded at the second folding line (valley folding line) 32.

  Further, in the fourth folding step, as shown in FIG. 5D, a fourth folding line (valley folding line) is set as a straight line that divides the airbag 24 into approximately two equal parts to the left and right and extends in the direction along the base edge. ) Is folded back to the vehicle outer side so that the side 44 h on the front end side of the airbag 24 does not intersect the retainer 26. This folding process is repeated two more times, that is, a total of three times. Specifically, in the fifth folding step after the fourth folding step, as shown in FIG. 5 (e), the airbag 24 at the completion of the fourth folding step is divided into approximately two equal parts to the left and right, and the base edge. The side 45h on the front end side of the airbag 24 is folded back to the outside of the vehicle along a fifth fold line (valley fold line) 35 set as a straight line extending in a direction along the direction of the vehicle. In the final sixth folding step, as shown in FIG. 5 (f), the airbag 24 at the time of completion of the fifth folding step is set as a straight line that divides into approximately two equal parts left and right and extends in the direction along the base edge. The front side 46h of the airbag 24 is folded along the sixth fold line (valley fold line) 36 so as not to cross the retainer 26. As described above, the folding lines 34 to 36 are set so that the folded portion does not overlap the retainer 26 in any of the three foldings by the fourth to sixth folding steps (folding step). Thus, the folding operation of the airbag 24 is completed, and the airbag 24 is stored in the seat opening 21h facing the front of the vehicle in the folded state shown in FIG.

  As shown in FIG. 7, the thickness t1 of the airbag 24 folded through the above-described steps is approximately the same as the length t2 in the left-right direction of the retainer 26. The airbag 24 and the retainer 26 have a thickness t1. It becomes one substantially rectangular parallelepiped shape. The folded airbag 24 is fixed to the frame 18 as a fixing portion in a state of being wrapped in a wrapping sheet 38 made of polyester, for example, so as not to collapse.

Next, the operation of the side airbag device 22 will be described.
The above-described impact sensor outputs a command signal to the inflator 25 when detecting that an impact of a predetermined value or more is applied to the vehicle. Based on the command signal, the inflator 25 operates to generate inflation gas, and this inflation gas is supplied into the airbag 24 via the gas ejection portion 14. When the internal pressure of the airbag 24 exceeds a predetermined value due to the inflation gas, the folding of the airbag 24 is solved in one step. As a result, the volume of the airbag 24 into which the inflation gas flows is increased and the internal pressure is reduced. Further, when the inflation gas is supplied into the airbag 24 and the internal pressure becomes a predetermined value or more, the folding of the airbag 24 is solved one more stage. By repeating this, the airbag 24 is unfolded in the first to sixth folding steps. That is, when inflation gas is supplied into the airbag 24 by the inflator 25, first, as shown in FIG. 6A, the airbag 24 is formed surrounded by the second and sixth folding lines 32 and 36. The first inflating part 71 is inflated. And as shown in FIG.5 (f), the 6th folding | returning part 46 folded in the 6th folding process expand | deploys to a front-end | tip direction. Next, as shown in FIG. 6A, in addition to the first inflating portion 71, the second formed by being surrounded by the second, fifth and sixth folding lines 32, 35, 36 of the airbag 24. The expansion part 72 expands. And as shown in FIG.5 (e), the 5th folding | turning part 45 folded in the 5th folding process expand | deploys in a front-end | tip direction. Next, as shown in FIG. 6A, in addition to the first and second inflating portions 71 and 72, the airbag 24 is surrounded by the second, fourth and fifth folding lines 32, 34 and 35. The formed third expansion part 73 expands. At this time, the wrapping sheet 38 and the cover 28 of the seat opening 21h are broken by the distal end portion of the inflated and deployed airbag 24. And the front-end | tip part of the airbag 24 protrudes outside from the part which the cover 28 fractured | ruptured. Next, as shown in FIG. 6A, in addition to the first to third inflating parts 71 to 73, the fourth formed by being surrounded by the second and fourth folding lines 32 and 34 of the airbag 24. The expansion part 74 expands. Then, as shown in FIG. 5D, the fourth folded portion 44 folded in the fourth folding step is developed in the distal direction. Next, in addition to the 1st-4th expansion parts 71-74, as shown to Fig.6 (a), the 5th expansion part 75 enclosed and formed by the 1st-3rd folding lines 31-33 expand | swells. To do. Then, as shown in FIGS. 6B and 6C, the second folded portion 42 including the third folded portion 43 expands upward. Next, in addition to the first to fifth inflating portions 71 to 75, as shown in FIG. 6A, the sixth formed by being surrounded by the first and third folding lines 31 and 33 of the airbag 24. The expansion part 76 expands. Then, as shown in FIGS. 6C and 6D, the third folded portion 43 including the first folded portion 41 is expanded upward. Finally, the seventh expansion portion 77 shown in FIG. 6A, that is, the first folded portion 41 is expanded in the upper left direction, and the seventh expansion portion 77 expands. At this time, the second bag opening 27 closed by the first folding step is released, and a part of the inflation gas is discharged from the second bag opening 27 to the outside. Thereby, it is suppressed that the internal pressure of the airbag 24 increases excessively. As shown in FIG. 2, the airbag 24 bulges between the occupant P and the body side portion of the vehicle to restrain the occupant P. In addition, in FIG.6 (b)-(d), the 5th expansion part 75 showed the range by hatching.

As described above, according to the embodiment described above, the following effects can be obtained.
(1) Along the first fold line (valley fold) 31 set as a straight line inclined upward at an angle α with respect to the base edge from the vicinity of the center of the base edge of the airbag 24 in the first folding step. The airbag 24 is folded back. Then, it folds through the 2nd-6th folding process. For this reason, it is the last time that the first folded portion 41 is unfolded during the expansion and deployment. For this reason, since the inflation gas flows into the leading end side preferentially over the first folding portion 41 until the folding in the sixth to second folding steps is released, the speed of deployment of the airbag toward the leading end side is increased. The crew member P can be restrained more quickly.

  (2) In the second folding step, the second folded portion 42 including the oblique side 41s that is the upper side of the airbag 24 formed in the first folding step is folded along the second folding line (valley folding line) 32. For this reason, the airbag 24 can be folded compactly in the direction along the base end axis. In addition, the upper side of the airbag 24 that has undergone the second folding step is a straight side 42t. Since the straight side 42t is perpendicular to the direction along the base end axis, it is possible to suppress the formation of irregularities on the upper surface of the airbag 24 formed by the straight side 42t by folding the airbag.

  (3) Since the airbag 24 is folded so as not to overlap the inflator 25 in any of the first to sixth folding steps, an increase in thickness caused by overlapping the folded portion with the retainer 26 is suppressed. it can. Thereby, the side airbag apparatus 22 can be made more compact. Therefore, for example, when the side airbag device 22 is attached to the frame 18, it is possible to prevent a convex portion from being formed outside through the cover 28.

  (4) A retainer 26 is provided below the base end of the airbag 24. By arranging the retainer 26 in this way, the first folded portion 41 can be provided larger while preventing the first folded portion from overlapping the retainer 26 during the first folding step. Thereby, since the area of parts other than the 1st folding | turning part 41 of the airbag 24 becomes relatively small, the expansion | deployment deployment of the part can be made faster.

  (5) The thickness of the airbag 24 folded three times in the fourth to sixth steps is approximately the same as the length of the retainer 26 in the thickness direction. Thereby, the retainer 26 and the folded airbag 24 form one substantially rectangular parallelepiped shape, and the packageability of the side airbag device can be improved.

  (6) The second bag opening portion 27 is provided in the first folding portion 41, and when the airbag 24 is completely deployed, that is, when the folding of the first folding portion 41 is released, the second bag opening portion 27 is provided. Open. Thereby, it is suppressed that the internal pressure of the airbag 24 increases excessively.

In addition, the said embodiment can be implemented with the following forms which changed this suitably.
-In the said embodiment, in the 4th-6th process, the airbag 24 is equally divided into right and left, and the 4th-6th fold line (valley fold line) 34-set as a straight line extended in the direction along a base end edge- It turned three times along 36. The number of folds is not limited to three, and the number of folds may be changed as appropriate in accordance with the dimensions of the airbag 24 and the retainer 26. Further, as shown in FIG. 8, the tip of the airbag 24 may be rolled up in a roll shape in the proximal direction.

  In the above embodiment, the airbag 24 is folded back in a total of six steps, the first to sixth steps, but the third folding step can be omitted. In this case, for example, by changing the shape of the airbag 24 as appropriate or by setting the second fold line (valley fold line) 32 upward, the entire second folded portion 42 that folds in the second folding step is the airbag. 24 to be above. In other words, the folded portion of the airbag 24 may not protrude from the outline of the airbag 24. Further, when the length in the direction along the base end edge of the airbag 24 is approximately the same as the length of the retainer 26 in the same direction, the second folding step can be omitted.

  -In the said embodiment, all of the 1st-6th process turned up by valley folding (folding back to the vehicle outer side). For example, all of these may be mountain folds (returns to the inside of the vehicle). It is also possible to combine valley folding and mountain folding.

  In the above embodiment, the retainer 26 is included in the airbag 24 over its entire length, but the gas ejection part 14 of the inflator 25 accommodated in the retainer 26 may be inside the airbag 24, for example, A part of the retainer 26 and the inflator 25 may protrude outside the airbag 24.

  In the above embodiment, the folding in any of the first to sixth steps is folded so that the airbag 24 does not overlap the inflator 25, but may be folded so as to overlap the inflator 25. Even in this case, since the inflation gas is guided along the first folding line 31 to the distal end side of the airbag 24, the deployment speed of the airbag 24 toward the distal end side is different from that when folded back so as not to overlap the inflator 25. There is no.

  In the above embodiment, the retainer 26 is provided on the lower side of the base end of the airbag 24. However, the retainer 26 may not be provided on the lower side of the base end. For example, the retainer 26 may be provided on the upper side of the base end of the airbag 24. . In this case, the first folding part 41 and the second folding part 42 are set at the lower part of the airbag 24.

The side view which showed the installation position of the airbag apparatus in this embodiment. The side view of the state in which the airbag inflated and deployed in this embodiment. The principal part side view of the airbag apparatus in this embodiment. The principal part perspective view of the airbag apparatus in this embodiment. (A)-(g) is process drawing which shows a folding process based on the 1st-6th folding process of an airbag in this embodiment. In this embodiment, (a) is the side view which showed each expansion | swelling part of the airbag, (b)-(d) is the side view at the time of expansion | deployment of an airbag. Sectional drawing of the airbag apparatus at the time of folding in this embodiment. Side surface sectional drawing which shows the folding method of the airbag in another embodiment The schematic of the airbag apparatus in a prior art. (A)-(d) is process drawing which shows the folding process of the airbag in a prior art.

Explanation of symbols

  18 ... Frame, 21 ... Seat, 22 ... Side airbag device, 24 ... Airbag device, 24d ... First bag opening, 24h ... Through hole, 25 ... Inflator, 26 ... Retainer, 27 ... Second bag opening, 28 ... Cover, 31-36 ... First to sixth folding lines, 41 ... First folding part, 41s ... Slanted side, 42 ... Second folding part, 42t ... Direct side.

Claims (6)

An airbag that is accommodated in a state in which it can be inflated and deployed from the proximal end side to the distal end side in the accommodating portion provided on the side portion of the seat back;
A retainer that is provided on the base end side of the airbag and is fixed to the housing portion in a state of housing an inflator that generates an inflation gas supplied into the airbag;
In the event of a vehicle collision, the inflation gas generated by the inflator is supplied to the interior of the airbag, so that the airbag is inflated from the housing portion and deployed in the space between the side wall of the vehicle and the occupant, A side airbag device that protects an occupant with the deployed airbag,
The airbag has a part on the base end side thereof folded obliquely with respect to the direction from the base end side to the front end side of the airbag, and then folded from the front end side to the base end side of the airbag. Or a side airbag device that is rolled up. In the side airbag device according to claim 1,
The airbag is folded back at an angle and then folded along a fold line extending from the proximal end portion toward the distal end portion, and folded from the distal end side toward the proximal end side of the airbag. Or a side airbag device that is rolled up. In the side airbag device according to claim 1 or 2,
The airbag is a side airbag device folded so as not to overlap the retainer. In the side airbag device according to any one of claims 1 to 3,
The side airbag apparatus which has arrange | positioned the said retainer below or above the center of the base end edge of the said airbag. In the side airbag device according to any one of claims 1 to 4,
A side airbag device in which the folded airbag has the same thickness as the retainer in the thickness direction. In the side airbag device according to any one of claims 1 to 5,
A side airbag device in which an opening is provided in an obliquely folded portion of the airbag.

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