JP4592092B2 - Airbag - Google Patents

Description

  The present invention relates to an airbag that is deployed from, for example, a side portion of an automobile seat along a side portion of an occupant.

Conventionally, an airbag device that deploys an airbag on the side of an automobile occupant and protects the occupant in the event of a side collision has been developed by folding an airbag stored on the side of the seat between the occupant and the door. An airbag device called a side airbag that protects a side portion of an occupant is known. The airbag device includes a bag-shaped airbag and an inflator that supplies gas to the airbag. The airbag is flattened by overlapping a pair of base fabrics and sewing the outer peripheral portions together. It is formed in a bag shape. Furthermore, with respect to such an airbag, a configuration is provided in which partition walls that divide the inside of the airbag into upper and lower air chambers are provided, and gas is appropriately distributed to these upper and lower air chambers to achieve desired deployment characteristics. It has been known. That is, the structure which arrange | positions a rod-shaped inflator in the cylindrical gas distributor with which both ends were open | released (for example, refer patent document 1), and the structure which clamps the gas distributor which accommodated the inflator to an airbag with a fastening member ( For example, refer to Patent Document 2), a structure in which a retainer that holds an inflator is sandwiched by a plurality of fixing devices disposed outside the airbag (for example, refer to Patent Document 3), the inflator is fixed to a case, and the inflator A configuration (for example, see Patent Document 4) in which an airbag is mounted so as to cover the surface is known.
JP 2004-210047 A (4th page, FIG. 2) JP 2004-210048 (first page, FIG. 2) JP 2004-338698 A (page 7, FIG. 2) Japanese Patent Application Laid-Open No. 2004-276808 (page 7, FIG. 1)

  In the configuration provided with the partition wall that divides the inside of the airbag as in the conventional case, the configuration in which the inflator is disposed above and below the partition so that gas can be distributed and is fixed to the airbag tends to be complicated, and the inflator is disposed. There is a problem that it is difficult to secure the thickness dimension when the airbag is deployed at the portion.

  That is, in the configuration of Patent Document 1, the relationship between the fixing structure of the inflator and the base fabric of the airbag is not clearly shown. However, in the configurations of Patent Documents 2 and 3, the airbag is used together with the inflator with a dedicated metal fitting. Tightening complicates the structure. Moreover, in the structure of the cited document 4, since an inflator is arrange | positioned outside an airbag, the structure which maintains the airtightness of the connection part of an airbag and an inflator tends to become complicated.

  The present invention has been made in view of these points, and an object thereof is to provide an airbag that can simplify the structure and obtain a desired deployed shape.

  The airbag according to claim 1 is an airbag that is flattened along the occupant by gas supplied from the gas supply means, and includes a first panel portion that faces the occupant, and the first panel portion. A second panel portion located on the side opposite to the occupant and opposed to the first panel portion and constituting an outer shell of the airbag together with the first panel portion; the first panel portion and the second panel portion; A third panel portion that defines a plurality of air chambers by partitioning between the first panel portion and the first connection portion that connects the third panel portion to the first panel portion along the longitudinal direction; A third connecting portion for connecting the third panel portion to the second panel portion along the longitudinal direction, and intersecting at least one of the first connecting portion and the second connecting portion, and the third panel And at least one of the first panel and the second panel Is obtained by and a can be inserted insertion portion of the gas supply means communicates between said plurality of air chambers through between.

  In this configuration, the interior of the airbag is partitioned into a plurality of air chambers by the third panel portion. The gas supply means is disposed in an insertion portion that communicates between the plurality of air chambers through at least one of the third panel portion, the first panel portion, and the second panel portion. Gas is supplied from the gas supply means to each air chamber with a simple structure while ensuring the thickness dimension during deployment.

  The airbag according to claim 2 is the airbag according to claim 1, wherein the first connecting portion and the second connecting portion are stitched to sew the third panel portion to the first panel portion and the second panel portion. The insertion portion is provided between the stitched portions at an intermediate position in the longitudinal direction of any of the connecting portions.

And in this structure, an insertion part is easily comprised by not sewing together panels, and manufacturing cost is reduced .

Airbag according to claim 3, wherein, in the airbag according to claim 1, comprising an air bag for a flat deployed along the occupant one end to the starting point, the first panel portion and the second panel portion And a fourth panel portion that constitutes an outer shell of the airbag together with the first panel portion and the second panel portion, and the fourth panel portion is in the vicinity of the starting point. Except for the opening provided in the first panel part and the second panel part, and the third panel part is connected to the first panel part and the second panel part. A partition wall section that divides the space, a partition wall surplus portion that is provided along the edges on both sides of the partition wall section and is connected to the first panel section and the second panel section, respectively, and a terminal of the partition wall section. And an accessory wall portion disposed along the fourth panel portion, And a supplementary wall surplus part provided along the edges on both sides of the splicing wall part and connected to the first panel part and the second panel part, respectively. Are discontinuous with each other.

  In this configuration, the third panel portion and the fourth panel portion become a town, and a protection region having a predetermined thickness dimension is secured. About the terminal of the 3rd panel part which divides the inside of an airbag, manufacturing operation becomes easy, ensuring airtightness.

  According to the airbag of the present invention, the interior of the airbag can be partitioned into a plurality of air chambers by the third panel portion. The gas supply means is disposed in an insertion portion that communicates between the plurality of air chambers through at least one of the third panel portion, the first panel portion, and the second panel portion. Gas can be supplied from the gas supply means to each air chamber with a simple structure while ensuring the thickness dimension during deployment.

  Hereinafter, an embodiment of an airbag according to the present invention will be described with reference to the drawings.

  In FIG. 2, reference numeral 5 denotes a seat that is a member to be attached. The seat 5 is provided in a compartment of a vehicle body of an automobile as a vehicle so as to face a side door portion that is a facing surface. A side-impact airbag that inflates and deploys between the occupant A seated on the seat 5 at the time of a vehicle collision and the lower portion of the door portion of the vehicle body to protect the chest from the lumbar portion of the occupant A. An airbag device 11 constituting a so-called side airbag is provided. In addition to the airbag device 11 that constitutes the side airbag, the passenger compartment includes an airbag device that is deployed from the steering wheel, an airbag device for the passenger on the passenger seat that is deployed from the instrument panel, and downward from the roof side. A curtain airbag that extends and covers the upper side of the door portion is provided.

  As shown in FIGS. 1 to 5, the airbag device 11 constituting the side airbag includes an inflator 12 that generates and injects gas, and a bag-like air that is inflated and deployed by the gas supplied by the inflator 12. The bag 14 includes a fixing member 16 that connects the inflator 12 and the airbag 14 and fixes the inflator 12 to the seat, a case body (not shown) that is a cover for storing these members, and the like. The inflator 12 and the fixing member 16 constitute a gas supply means 17.

  The inflator 12 includes a substantially columnar main body 21 and a gas supply unit 22 projecting from one end of the main body 21. Further, a terminal portion 23 for operating the inflator 12 is provided at the other end portion of the main body portion 21, and a harness (not shown) is connected thereto. The gas supply unit 22 is a diffuser that supplies a gas. The gas supply unit 22 protrudes in a cylindrical shape from one end of the main body 21, and a plurality of circular holes serving as gas discharge ports are formed on the peripheral surface. The inflator 12 is a so-called hybrid type that reacts with the propellant filled in the main body 21 and releases the gas stored in the cylinder inside the main body 21 so that the gas supply unit 22 Inject low temperature gas.

  The fixing member 16 is also called a holder or a retainer, and includes a retainer main body portion 31 formed by bending a sheet metal, and a bolt 32 as a vehicle-side fixing portion fixed to the retainer main body portion 31 by welding or the like. I have. As shown in FIG. 1, the retainer main body 31 includes a substantially flat substrate portion 33, a pair of holding portions 34 integrally extended from the substrate portion 33, and a substrate portion 33. And a guide part 35 extending integrally in a substantially cylindrical shape. Further, a stopper (not shown) that projects from the end portion of the substrate portion 33 to abut the tip portion of the inflator 12 is provided. The holding portion 34 is curved in a substantially cylindrical shape into which the main body portion 21 of the inflator 12 can be inserted, and a fixing portion provided on the distal end side is fixed to the substrate portion 33 by welding or rivets, and is elastically attached to the inflator 12. The inflator 12 is sandwiched and held between the substrate portion 33 and the substrate portion 33. Moreover, the guide part 35 has an elliptical shape, and the inner peripheral surface is a gas guide part.

  Further, the airbag 14 is configured by stitching together base fabrics, which are also called four panels, and first and second base fabrics 41 and 42 as first and second panel portions having substantially the same type, and these 3rd and 4th base cloth 43 and 44 as the 3rd and 4th panel part which connects base cloth 41 and 42, and 1st and 2nd base cloth 41 and 42 and 4th base cloth The outer shell of a flat box-shaped bag body is configured by sewing together 44 and 44 except for the opening 45.

  That is, the first and second base fabrics 41 and 42 are formed in a substantially polygonal shape in a state where they are spread on a plane, and the third and fourth base fabrics 43 and 44 are formed in a band shape having a predetermined width dimension. ing. For example, in a state where the peripheral edge portion of the first base cloth 41 and the peripheral edge portion on one side of the fourth base cloth 44 are overlapped, the peripheral edge portions are used together except for the opening 45 portion. The peripheral edge of the second base cloth 42 and the peripheral edge of the fourth base cloth 44 are overlapped with each other along the two stitched lines. A box-like bag body in which the fourth base fabric 44 becomes a gusset and expands in a predetermined thickness by, for example, reversing from the opening 45 portion after the portions are sewn together along a suture line using a thread. An airbag 14 is configured.

  The third base fabric 43 can also be referred to as a baffle. The third base fabric 43 includes an elongated rectangular partition wall portion 47 having a predetermined width dimension, and a partition wall surplus portion 48 on both side edges along the longitudinal direction of the partition wall portion 47. , 49 are formed. Then, these partition wall surplus parts 48 and 49 are respectively stitched to the first and second base fabrics 41 and 42 by using a thread, that is, one partition wall surplus part 48 is connected to the first connecting part 51 which is a stitched part. The other partition surplus portion 49 is connected to the second base fabric 42 by the second connection portion 52 that is a stitching portion, and the inner side of the airbag 14 is partitioned vertically by the partition portion 47. ing. That is, a first air chamber (chest protector) 54 that is a chamber located above the partition wall 47, and a second air chamber (waist protector) 55 that is a chamber located below the partition wall 47, Is configured. And while the 1st connection part 51 is formed over the full length of the bulkhead surplus part 48, as for the 2nd connection part 52, the part which is not formed in part near the opening 45 is set, and this part is An insertion portion 57 that penetrates up and down and communicates with the upper and lower air chambers 54 and 55 is formed. Further, the portion of the insertion portion 57 at a position slightly spaced from the opening 45 inside the airbag 14 becomes a gas supply means arrangement portion 58 where the inflator 12 and the fixing member 16, that is, the gas supply means 17, are arranged. Further, the portion on the opening 45 side, that is, the rear side from the gas supply means arrangement portion 58 is a reversal fixing portion 59 that is folded back to the opposite opening 45 side, that is, the front side and overlapped with the second base cloth 42. The gas supply means arrangement portion 58 and the reverse fixing portion 59 are formed with mounting holes 61 and 62 into which the bolt 32 can be inserted. In other words, the first base cloth 41 is formed with a pair of upper and lower mounting holes 62 in the reverse fixing portion 59. On the other hand, the second base cloth 42 has a pair of upper and lower mounting holes 61 facing the starting point, that is, the gas supply means arrangement section 58, and is aligned with the first base cloth 41 in the reverse fixing section 59. Thus, a pair of upper and lower mounting holes 62 are formed. Although not shown, each base cloth 41, 42, 43, 44 is located on the inner side of the bag body as needed, and is a reinforcing cloth called a flameproof cloth, etc. for reinforcing and improving heat resistance. Is placed.

  Next, an assembly process of the airbag device 11 will be described.

  First, a gas supply means 17 in which the inflator 12 is combined with the fixing member 16 is configured, the gas supply means 17 is inserted into the airbag 14 from the opening 45, and the guide part 35 is inserted into the insertion part 57, that is, the second base fabric. It press-fits between 42 and the partition extra part 49 of the 3rd base fabric 43. FIG. In this state, the guide portion 35 of the gas supply means 17 is in a state where the front and rear are sandwiched by the second connecting portion 52. At the same time, each bolt 32 of the gas supply means 17 is pulled out from the first mounting hole 61. Further, the reverse fixing portion 59 of the airbag 14 is folded back, the bolt 32 is inserted into the other mounting hole 62, and a nut is screwed into the bolt 32 and temporarily fixed.

  Then, the airbag device 11 is configured by folding the airbag 14 in an appropriate state and holding the folded shape of the airbag 14 with a shape-retaining means such as a tape that can be easily broken.

  Then, after the airbag device 11 is stored in a case (not shown), the airbag device 11 is stored in the side portion of the back portion of the seat 5, and the bolt 32 of the fixing member 16 is attached to the seat 5 using a nut or the like as a fastener. The airbag device 11 is attached to the seat 5 of the automobile by being fixed to a frame as a vehicle body member. In this state, the base fabric of the gas supply means disposition portion 58 and the reverse fixing portion 59, which is the starting point of the airbag 14, is sandwiched between the base plate portion 33 of the fixing member 16 and the frame of the seat 5, and firmly Supported.

  Next, an operation when the airbag device 11 is deployed will be described.

  First, when the vehicle receives an impact such as a side collision, electric power is supplied from the control device via the harness, the inflator 12 is activated, and gas is injected from the gas supply unit 22. Then, the gas is guided to the guide part 35 and distributed at a desired distribution rate, and the air chamber 54 as the upper and lower chest protection parts of the partition wall part 47 of the third base fabric 43 and the air chamber as the waist protection part. And 55 with a predetermined pressure difference. Due to the pressure of the gas, the airbag 14 opens the cover and protrudes from the seat 5, and is inflated and deployed between the side portion of the occupant A and the door portion to protect the occupant A.

  And according to this Embodiment, it is flat between the passenger | crew's A body side part and the inner surface of the compartment side part so that this passenger | crew's A body side part may be covered from the back side of the passenger | crew A at the time of a vehicle collision. For a so-called side airbag that is inflated and deployed, the inner side of the airbag 14 is partitioned into a plurality of air chambers 54 and 55 by a partition wall portion 47 of a third base fabric 43 having a predetermined width dimension, and each part of the occupant A is defined. The desired deployment characteristics that protect with appropriate pressure can be realized, and the occupant A can be effectively protected.

  The gas supply means 17 for supplying gas to the air chambers 54 and 55 is inserted through the space between the third base fabric 43 and the second base fabric 42 to communicate between the plurality of air chambers 54 and 55. By press-fitting and arranging in the portion 57, the gas can be supplied from the gas supply means 17 to the air chambers 54 and 55 with a simple structure while ensuring the thickness dimension when the airbag 14 is deployed.

  That is, in the gas supply means arrangement portion 58, the gas supply means 17 is fixed to the second base cloth 42 but is not fixed to the first base cloth 41. Therefore, a separation distance between the first base cloth 41 and the second base cloth 42 when the airbag 14 is deployed is secured in the vicinity of the gas supply means arrangement portion 58, that is, in the vicinity of the starting point of deployment, that is, a predetermined size. A desired unfolded shape that can secure a shock absorbing stroke can be easily realized, and an occupant can be effectively protected.

  Further, the insertion portion 57 can be realized by providing a portion that is not sewn at a part of the intermediate position in the longitudinal direction of the partition wall surplus portion 49 of the third base fabric 43, the structure can be simplified, and the manufacturing cost can be reduced.

  Further, the guide portion 35 of the gas supply means 17 is arranged in the insertion portion 57 so as to press-fit between the base fabrics 42 and 43 and is sandwiched between the second connecting portions 52 which are stitched portions. Since this is in a state, it can be mounted stably and a certain airtightness between the air chambers 54 and 55 can be secured.

  In this way, the first and second base fabrics 41 and 42 that become the main panel and the third base fabric 43 that forms the partition wall 47 can be rationally realized, and the portion of the inflator 12 can be Processing can be realized rationally.

  Further, in the present embodiment, the airbag 14 includes a first base cloth 41 that faces the body side of the occupant A, a second base cloth 42 that faces the inner surface of the passenger compartment 2, and these first base cloths. In addition to the third base cloth 43 that connects the intermediate positions of the cloth 41 and the second base cloth 42, the fourth base cloth 41 connects the peripheral portions of the first base cloth 41 and the second base cloth 42 to each other. The base fabric 44 is provided, and the fourth base fabric 44 is arranged from the starting point which is the rear end edge, before the starting points of the first base fabric 41 and the second base fabric 42, that is, before the rear end edge, before, above and below. Are connected by a series of stitches or sutures continuously over the entire periphery. As described above, the fourth base cloth 44 is connected to the first base cloth 41 and the second base cloth 42 from the starting side by a series of stitching lines to form a box shape. That is, when viewed from the occupant A side, there cannot be a location where the thickness is extremely large at the center or the like, and the thickness of the outer peripheral portion can be secured, and there is a location where the thickness is small and occupies the area at the periphery. In other words, since a three-dimensional side airbag can be constructed, it can be quickly deployed even in a narrow space. And since it has a rectangular parallelepiped box-like cross-sectional shape that is continuous from the starting point, it is possible to suppress swinging during deployment and easily deploy it to a desired position. Furthermore, in order to deploy in a simple rectangular parallelepiped box shape from the rear side to the front side, the gas flow path is formed at the initial stage of deployment, and further deployed so that the flow path extends forward, The load applied to each base fabric 41, 42, 43, 44 can be suppressed. In this way, in the airbag 14 that flatly deploys forward from one end, it is possible to secure a predetermined shock absorbing stroke, prevent the occurrence of a location where the thickness dimension is maximized, and quickly deploy, Even without using a high-power inflator, the primary pressure can be quickly raised, the load applied to the airbag 14 as a whole can be suppressed, and the stable deployment behavior and deployment posture of the airbag 14 supported at one end can be achieved. Obtainable. In particular, when used in conjunction with a curtain airbag, it is required to securely protect a narrow area such as the side of the occupant's waist and chest, for example. The airbag device 11 that can be deployed and is suitable for combined use with other airbag devices such as curtain airbags can be provided.

  In the above embodiment, the insertion portion 57 constituting the gas supply means arrangement portion 58 is provided with a portion that is not sewn at a part of the intermediate position in the longitudinal direction of the partition wall surplus portion 49 of the third base fabric 43. Although it implement | achieved, it is not restricted to this structure, For example, the insertion part 57 can also be comprised by notching a part of 3rd base fabric 43 etc. FIG.

  For example, as shown in FIG. 6, the partition portion 47 of the third base fabric 43 is cut out along the shape of the guide portion 35 to form the insertion portion 57, whereby the guide portion 35 of the gas supply means 17 is changed. It can be easily inserted into the insertion part 57 without difficulty.

  Further, as in the configuration shown in FIG. 6, by using a separate fixture 71, the airtightness between the air chambers 54 and 55 is improved, and the gas supply means 17 is firmly attached to the gas supply means arrangement portion 58. It can also be fixed. That is, the fixing tool 71 includes an inner metal fitting 72, an outer metal fitting 73, and a nut 74. The inner metal fitting 72 includes a substrate portion 75 formed along the shape of one surface of the guide portion 35, and a pair of bolts 76 that are fastening tools fixed to the substrate portion 75. Further, the outer metal fitting 73 is a flat plate shape along the shape of the other surface of the guide portion 35, and an attachment hole 77 into which the bolt 76 can be inserted is formed. An attachment hole 78 into which the bolt 76 can be inserted is also formed in the remaining partition wall 49 of the third base fabric 43. Therefore, in this configuration, the third base fabric is provided with the guide portion 35 of the gas supply means 17 arranged in the insertion portion 57 of the gas supply means arrangement portion 58 and the outer metal fitting 73 along the outer side of the airbag 14. The bolts 76 of the inner metal fitting 72 arranged below the partition wall 47 of the 43 are inserted into the mounting holes 78 and 77 and pulled out to the outside of the airbag 14, and nuts 74 are screwed onto these bolts 76 and tightened. In this state, the partition wall 49 of the third base cloth 43, the guide part 35 of the gas supply means 17, and the second base cloth 42 are sandwiched between the base plate portion 75 of the inner metal fitting 72 and the outer metal fitting 73. The gas tightness between the air chambers 54 and 55 can be improved and the gas supply means 17 can be firmly fixed.

  Further, by extending the end portion of the third base fabric 43 and connecting it to the fourth base fabric 44 or the like, the joint portion between the third base fabric 43 and the fourth base fabric 44 is reasonably treated. In addition, the airtightness of the terminal portion of the third base fabric 43 that divides the air chambers 54 and 55 can be improved, and so to speak, a box shape in which a three-piece bag is added to ensure a thickness dimension when deployed over the entire area. Can be realized.

  For example, as shown in FIG. 7, the partition wall portion 47 of the third base fabric 43 is extended to form the accessory wall portion 81, and the accessory wall surplus portion is continuous with the edge portions on both sides of the accessory wall portion 81. 82 is formed. Here, the accessory wall portion 81 is formed continuously with the partition wall portion 47, but the accessory wall surplus portion 82 is discontinuous with the partition wall surplus portion 48 due to the notch 84. And the part between the accessory wall part 81 and the partition part 47 in the state which sewn the partition extra part 48 of the 3rd base fabric 43 to the 1st and 2nd base cloths 41 and 42 by the connection parts 51 and 52, respectively. Then, the third base cloth 43 is bent so that the accessory wall portion 81 is in a state along the first and second base cloths 41 and 42. In this state, the auxiliary wall portion 81 is arranged along the inner surface of the fourth base fabric 44 along the auxiliary wall portion 81, and the additional auxiliary wall portion 82 on one side is sewn between the fourth base fabric 44 and the first base fabric 41. The auxiliary wall 82 on the other side is sewn and connected between the fourth base fabric 44 and the second base fabric 42, so that the terminal portion of the third base fabric 43 can also be The third base cloth 43 that partitions the air chambers 54 and 55 in a substantially airtight manner can be disposed in a state in which a protection region having a predetermined thickness is secured without crushing the town. Further, these base fabrics 41, 42, 43, and 44 may be sewn in sequence, and the manufacturing process can be prevented from becoming complicated.

  Note that the shape of the airbag 14 is not limited to the above, and when a so-called curtain airbag that protects the head of the occupant A is not used, the capacity is larger and the head is also deployed to protect the head. It can also be configured.

  In the above embodiment, the two air chambers 54 and 55 are provided. However, the present invention is not limited to this configuration, and a configuration including three or more air chambers may be employed.

  Further, the shapes and configurations of the inflator 12 and the fixing member 16 are not limited to those described above, and various configurations can be used. For example, the inflator 12 may have a so-called pyro type configuration that supplies gas by combustion. Further, the fixing member 16 can also be provided with a cooling means for cooling the gas supplied from the inflator 12. Further, the guide part 35 is formed in a substantially truncated cone shape that expands in one direction with respect to the axial direction of the inflator 12, and at a predetermined distribution rate, gas is directed in one direction rather than in the other direction. Many can be distributed.

  In the airbag 14, an exhaust port for exhausting gas after the airbag 14 is deployed can be provided in the first and second base fabrics 41, 42 or the fourth base fabric 44. Further, by not completely closing the opening 45 portion of the airbag 14, the opening 45 can be used as an exhaust port.

  Furthermore, depending on the position where the airbag 14 is disposed, the fourth base fabric 44 is not provided, and the edges of the first base fabric 41 and the second base fabric 42 are sewn together to form an outer shell of the airbag 14. It can also be configured.

  The present invention is used, for example, as a so-called side airbag that is housed in a side portion of a seat of an automobile and is deployed between an occupant and a door to protect the chest and trunk of the occupant.

It is a partial perspective view which shows one Embodiment of the airbag apparatus provided with the airbag of this invention. It is explanatory drawing which shows the installation state of an airbag apparatus same as the above. It is a perspective view which shows the state which the airbag of the airbag apparatus same as the above developed. It is sectional drawing of a part of airbag apparatus same as the above. It is explanatory drawing which shows the assembly process of an airbag apparatus same as the above. It is a partial exploded perspective view which shows other embodiment of the airbag apparatus provided with the airbag of this invention. It is a partial perspective view which shows other embodiment of the airbag of this invention.

14 Airbag
17 Gas supply means
41 First base fabric as first panel
42 Second base fabric as second panel
43 Third base fabric as third panel
44 4th base fabric as 4th panel part
47 Bulkhead
48 Extra bulkhead
51 First connecting part
52 Second connecting part
54,55 air chamber
57 Insertion section
81 wall
82 Additional wall
84 Notch A Crew

Claims (3)

An airbag that is flattened along an occupant by gas supplied from a gas supply means,
A first panel facing the occupant;
A second panel portion that is located on the opposite side of the first panel portion and is opposed to the first panel portion, and constitutes an outer shell of an airbag together with the first panel portion;
A third panel section that defines a plurality of air chambers by partitioning between the first panel section and the second panel section;
A first connecting portion for connecting the third panel portion to the first panel portion along the longitudinal direction;
A second connecting part for connecting the third panel part to the second panel part along the longitudinal direction;
Crossing at least one of the first connecting portion and the second connecting portion and passing between the third panel portion and at least one of the first panel portion and the second panel portion, the plurality of air bubbles. An air bag comprising: an insertion portion that allows communication between chambers and into which the gas supply means can be inserted. The first connecting portion and the second connecting portion include a stitching portion that stitches the third panel portion to the first panel portion and the second panel portion, and the insertion portion is an intermediate portion in the longitudinal direction of any of the connecting portions. The airbag according to claim 1, wherein the airbag is provided between the stitched portions at a position. An airbag that flatly deploys along the occupant starting from one end,
A peripheral portion of the first panel portion and the second panel portion are connected to each other, and a fourth panel portion that constitutes an outer shell of the airbag together with the first panel portion and the second panel portion;
The fourth panel portion is connected over the entire peripheral edge of the first panel portion and the second panel portion, except for an opening provided in the vicinity of the starting point,
The third panel portion is provided along a partition wall partitioning between the first panel portion and the second panel portion, and along the edges on both sides of the partition wall portion. A partition bulkhead connected to the second panel portion, an accessory wall portion arranged along the fourth panel portion in succession to the end of the partition portion, and along edges on both sides of the accessory wall portion Provided with a surplus wall surplus portion provided and connected to the first panel portion and the second panel portion, respectively. The surplus partition wall portion and the surplus wall surplus portion are discontinuous with each other through a notch. The airbag according to claim 1 or 2 .

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