JP2013006501A - Manufacturing method for airbag, and airbag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the easy manufacture of an airbag having a cavity.SOLUTION: A manufacturing method for the airbag includes (a) a step of preparing a plurality of base cloths 50 each having a main panel section 52 making up a main bag expandable/deployable into a bag shape toward an occupant and a sub panel section 54 formed to partially extend out of the outer periphery of the main panel section 52 and making up the sub bag section sinking from the main bag section 32 toward inside the same, (b) a step of joining together the peripheries of the plurality of base cloths 50 to form the main bag section and the sub bag section, (c) a step of connecting the sub bag section to a part of the main bag that is placed inside the main bag expandable/deployable into a bag shape, and (d) a step of reversing the main bag section so that the sub bag section is placed inside the main bag section.

Description

  The present invention relates to an airbag mounted on a vehicle such as an automobile and inflated and deployed by gas generated by an inflator.

  Conventionally, this type of airbag is disclosed in Patent Document 1.

  In patent document 1, the inner peripheral side base fabric is stitched to the outer peripheral side base fabric located on the outer peripheral surface side of the airbag. Thereby, the airbag is inflated into an annular body shape having a central hole.

Japanese Patent Laid-Open No. 2005-199961

  However, in patent document 1, in order to provide a dent in the expanded state, it is necessary to sew the inner peripheral base fabric. For this reason, manufacture of an airbag becomes troublesome.

  Then, an object of this invention is to enable it to manufacture easily the airbag which has a dent.

  In order to solve the above-mentioned problem, a first aspect is a method of manufacturing an airbag that is accommodated in a folded state in a front part of a passenger seat of a vehicle and that can be inflated and deployed by supplying a gas. A main panel portion constituting a main bag portion that can be inflated and deployed in a bag shape toward the side, and a bag that is formed so as to partially extend from the outer periphery of the main panel portion and that is recessed from the main bag portion to the inside thereof A step of preparing a plurality of base fabrics having a sub-panel portion constituting a shaped sub-bag portion, and (b) joining the peripheral portions of the plurality of base fabrics to form the main bag portion and the sub-bag portion And (c) connecting the sub-bag portion to a portion disposed inside the main bag portion with the main bag portion inflated and deployed in a bag shape, and (d) the sub-bag portion. Bag part To be disposed in the main bag portion, and a step of turning over the main bag portion.

  A 2nd aspect is an airbag manufacturing method concerning the 1st aspect, Comprising: As for a plurality of above-mentioned base cloth, two sheets of the above-mentioned base cloth which constitute the right half part and the left half part of the above-mentioned airbag Is done.

  A third aspect is an airbag manufacturing method according to the first or second aspect, wherein the sub-bag portion is formed in a shape having a bag-like portion that gradually narrows toward a tip end side thereof. Yes.

  A fourth aspect is a method of manufacturing an airbag according to any one of the first to third aspects, wherein at least one of the plurality of base fabrics partially extends from an outer periphery of the main panel portion. A connecting panel portion formed so as to come out, and in the step (c), the sub bag portion is connected to the connecting panel portion by connecting the sub bag portion to the connecting panel portion. Connect to the main bag part.

  A fifth aspect is an airbag manufacturing method according to any one of the first to third aspects, wherein the plurality of base fabrics partially extend from an outer periphery of the main panel portion. Formed at a position different from the sub-bag portion, and having a connecting panel portion constituting a bag-like connecting portion recessed inward from the main bag portion, and in the step (b), the plurality of base fabrics By joining the peripheral portions, the connecting portion is formed, and in the step (c), the sub bag portion is connected to the connecting portion by connecting the sub bag portion to the connecting portion through the connecting portion. Connect to the main bag part.

  A sixth aspect is an airbag manufacturing method according to the third aspect, wherein the plurality of base fabrics are formed so as to partially extend from an outer periphery of the main panel part, and the subbag part A connecting panel portion that forms a connecting portion having a bag-like portion that is recessed inward from the main bag portion and gradually narrows toward the tip end side thereof at a position different from the main bag portion, in the step (b) The peripheral portions of the plurality of base fabrics are joined together to form the connecting portion, and in the step (c), the bag-like portion that gradually narrows toward the tip side of the sub-bag portion. The bus bars and the bus bars of the bag-shaped portion that gradually narrows toward the tip side of the connecting portions are joined together.

  A seventh aspect is a method of manufacturing an airbag according to any one of the first to sixth aspects, wherein, in the step (a), the plurality of base fabrics having the main panel portion and the sub panel portion. In addition, a small base fabric is prepared, and in the step (b), the small base fabric is also bonded to the plurality of base fabrics.

  An eighth aspect is an airbag that is accommodated in a folded state in a front part of a passenger seat of a vehicle and that can be inflated and deployed by gas supply, and that can be inflated and deployed in a bag shape toward the passenger side. And a sub-bag portion recessed inward from the main bag portion, the main panel portion constituting the main bag portion, and a portion extending from the outer periphery of the main panel portion, The main bag portion and the sub bag portion are formed by joining peripheral portions of a plurality of base fabrics having a sub panel portion constituting the bag portion, and the sub bag portion is formed of the main bag portion. The main bag portion is connected to a portion disposed on the inner side in an inflated and deployed state in a bag shape.

  According to the airbag manufacturing method of the first aspect, the base fabric has a main panel portion and a sub panel portion. Then, joining a plurality of base fabrics to form a main bag portion and a sub bag portion, connecting the sub bag portion to a portion disposed inside the main bag portion, and turning the main bag portion upside down An airbag that is recessed at the sub-bag portion can be manufactured. For this reason, the airbag which has a dent can be manufactured easily.

  According to the 2nd aspect, an airbag can be manufactured by two sheets by using two main base fabrics.

  According to the 3rd aspect, since the said subbag part is formed in the bag shape which becomes thin gradually toward the front end side, it is easy to absorb a shock gradually in a subbag part.

  According to the 4th aspect, the position of the front-end | tip part of the subbag part in a main bag part can be set with the length of a connection panel part.

  According to the 5th aspect, another dent can be formed in the connection part different from a subbag part.

  According to the 6th aspect, since the bus | bath of a subbag part and a connection part is joined, the expansion | deployment aspect of a subbag part and a connection part is stabilized in the expansion | deployment deployment state of a main bag part. Thereby, the recessed part shape of a subbag part is stabilized.

  According to the 7th aspect, the freedom degree of an airbag shape can be improved with a small base fabric.

  According to the airbag according to the eighth aspect, the base fabric has a main panel portion and a sub panel portion. The main bag portion and the sub bag portion are formed by joining the peripheral edge portions of the base fabric, and the main bag portion is inflated and deployed in a bag shape. Since the bag portion is connected to a portion disposed on the inner side, an airbag having a recess can be easily manufactured without separately joining a portion forming the recess.

It is a schematic side view which shows the airbag apparatus which concerns on embodiment. It is a schematic side view which shows the airbag apparatus which concerns on embodiment. It is a figure which shows the expansion | deployment deployment shape of the airbag in the III-III line of FIG. It is the perspective view which represented the expansion | swelling shape of the airbag typically with the polyhedron. It is the perspective view which represented the expansion | swelling shape of the airbag typically with the polyhedron. It is the perspective view which represented the expansion | swelling shape of the airbag typically with the polyhedron. It is explanatory drawing which shows the manufacture procedure of an airbag. It is explanatory drawing which shows the manufacture procedure of an airbag. It is explanatory drawing which shows the manufacture procedure of an airbag. It is explanatory drawing which shows the manufacture procedure of an airbag. It is explanatory drawing which shows the manufacture procedure of an airbag. It is explanatory drawing which shows the manufacture procedure of an airbag. It is explanatory drawing which shows the manufacture procedure of an airbag. It is explanatory drawing which shows the manufacture procedure of an airbag. It is explanatory drawing which shows the manufacture procedure of an airbag. It is explanatory drawing which shows the manufacture procedure of an airbag. It is explanatory drawing which shows the manufacture procedure of an airbag. It is a schematic side view which shows the modification of an airbag. It is a schematic side view which shows the modification of an airbag. It is a schematic side view which shows the modification of an airbag. It is a schematic side view which shows the modification of an airbag. It is a schematic side view which shows the modification of an airbag. It is a schematic side view which shows the modification of an airbag. It is a schematic side view which shows the modification of an airbag. It is a schematic side view which shows the modification of an airbag. It is a schematic side view which shows the modification of an airbag. It is a schematic side view which shows the modification of an airbag. It is a schematic side view which shows the modification of an airbag. It is a schematic side view which shows the modification of an airbag.

  The airbag manufacturing method and airbag according to the embodiment will be described below. 1 and 2 are schematic side views showing a state in which the airbag device 20 including the airbag 30 is assembled in the instrument panel 10. FIG. 1 shows a state before the airbag 30 is inflated and deployed, and FIG. 2 shows a state where the airbag 30 is inflated and deployed. FIG. 3 is a view showing an inflated and deployed shape of the airbag 30 taken along line III-III in FIG. In the following description, for convenience of explanation, the front-rear direction, the up-down direction, and the left-right direction refer to directions that are based on the vehicle in which the airbag device 20 is incorporated.

  The airbag device 20 is incorporated in the upper surface portion of the instrument panel 10 in front of the passenger seat 16. A front window 12 is provided from the front side portion of the instrument panel 10 toward the rear obliquely upward. The airbag device 20 is configured as a device that absorbs an impact by receiving the occupant P that is about to move forward of the vehicle by inflating and deploying in front of the occupant P of the passenger seat 16 in the event of a vehicle collision or the like. . But the airbag apparatus 20 may be integrated in the front part of passenger seats other than a passenger seat.

  The airbag device 20 includes an inflator 22 (see FIG. 1) and an airbag 30.

  The airbag 30 is formed into a bag-like member by a sheet-like member. The airbag 30 is accommodated in the instrument panel 10 in a folded state in a normal state. When the vehicle is inflated and deployed at the time of a vehicle collision or the like, the airbag 30 is projected and inflated out of the instrument panel 10 by the gas supply from the inflator 22 and is directed toward the passenger P side of the passenger seat 16 which is the vehicle interior side. It expands and expands in a bag shape.

  In the instrument panel 10, an area where the airbag 30 is disposed is provided with a tear line that is easy to break so as to open the area. And the upper surface part of the case of the said instrument panel 10 receives the expansion | deployment force of the airbag 30, and the upper surface part of the case breaks in the said tear line, and inflates and deploys the airbag 30 toward the outer side of the instrument panel 10. An opening is formed.

  The inflator 22 includes an ignition device, a gas generating agent, and the like, and is configured to generate gas by igniting and burning the gas generating agent by the ignition device. The inflator 22 is attached to the airbag 30 at a position and posture where gas can be introduced into the airbag 30 via the gas supply port 32h (see FIG. 4). Upon receiving an ignition command signal from a vehicle impact detection unit or the like, the ignition device ignites and burns the gas generating agent, and the gas generated thereby is introduced into the airbag 30 through the gas supply port 32h. The airbag 30 is inflated and deployed.

  The airbag 30 will be described in more detail. 4 to 6 are perspective views schematically showing the inflated shape of the airbag 30 by a polyhedron.

  As shown in FIGS. 2 to 6, the airbag 30 is formed of a sheet-like member such as a cloth or a resin sheet, and includes a main bag portion 32, a subbag portion 40, and a connecting portion 44. Yes. The main bag portion 32 is the portion that expands and expands the most and constitutes the outermost periphery of the airbag 30, the subbag portion 40 is a portion that expands in the main bag portion 32, and the connecting portion 44 is the subbag. The portion 40 is connected to the main bag portion 32.

  That is, the main bag portion 32 is formed so as to be inflatable and deployable in a bag shape from the instrument panel 10 toward the passenger seat 16. Here, the main bag portion 32 includes a large bag portion 33 and a small bag portion 34 provided in the upper front portion of the large bag portion 33. The large bag portion 33 is configured to be inflatable and deployable between the instrument panel 10 and the passenger seat 16. The pouch portion 34 is configured to be inflatable and deployable between the large pouch portion 33 and the inflator 22 in the upper space of the instrument panel 10, and a gas supply port 32h to which gas from the inflator 22 is supplied is provided below the pouch portion 34. Is formed. Then, the gas from the inflator 22 is led from the gas supply port 32h through the small bag portion 34 to the large bag portion 33, so that the large bag portion 33 can be greatly inflated and deployed between the instrument panel 10 and the passenger seat 16. It is like that.

  An opening peripheral edge portion 35e is formed in a portion of the main bag portion 32 facing the passenger seat 16 side (that is, the rear portion). That is, when the main bag portion 32 is mainly observed, an opening is formed in a portion facing the passenger seat 16 side, and an opening peripheral portion 35e is formed so as to surround the opening. In the present embodiment, the opening peripheral edge 35 e is formed at a position for receiving the head of the passenger P seated on the passenger seat 16. That is, with the main bag portion 32 fully inflated and deployed, the opening peripheral edge 35e is disposed in front of the head of the passenger P seated on the passenger seat 16 or slightly below the head. Yes. In the state in which the airbag 30 is inflated and deployed, the opening peripheral edge portion 35e has an approximately annular shape.

  Further, here, a connecting portion opening peripheral portion 36e is formed at a position of the main bag portion 32 that faces the opening peripheral portion 35e. That is, when the main bag portion 32 is mainly observed, the connecting portion opening peripheral portion 36e is formed at a position facing the opening peripheral portion 35e through the internal space of the main bag portion 32 (that is, on the opposite side). ing. Here, in a state where the airbag 30 is inflated and deployed, the opening peripheral edge portion 36e for the connecting portion is disposed at an outer position of a portion of the instrument panel 10 facing the passenger seat 16. In the state in which the airbag 30 is inflated and deployed, the opening peripheral portion 36e for the connecting portion also has an approximately annular shape.

  The sub bag portion 40 is formed in a bag shape, and is provided so as to extend from the opening peripheral edge portion 35 e into the main bag portion 32. The sub bag portion 40 is observed as a shape recessed from the main bag portion 32 to the inside thereof. More specifically, the sub-bag portion 40 has a bag-like portion that gradually narrows toward the tip side. Here, in a state where the airbag 30 is inflated and deployed, the sub-bag portion 40 as a whole is formed in a conical bag shape with the opening peripheral edge portion 35e as a bottom portion. Accordingly, when the main bag portion 32 in the inflated and deployed state is observed from the outside, a hole that gradually narrows toward the back side is formed in a portion of the main bag portion 32 facing the passenger seat 16 side. . However, it is not essential that the sub-bag portion 40 has such a shape, and a portion of the sub-bag portion 40 may have a shape portion that gradually narrows toward the distal end side, The subbag portion 40 may have a cylindrical shape.

  The connecting portion 44 is configured to connect the sub bag portion 40 to the main bag portion 32 at a position opposite to the opening peripheral edge portion 35e.

  Here, the connecting portion 44 is formed in a bag shape, and is provided so as to extend from the connecting portion opening peripheral edge portion 36 e into the main bag portion 32. The connecting portion 44 is observed as a shape recessed from the main bag portion 32 to the inside at a position different from the sub bag portion 40. More specifically, the connecting portion 44 has a bag-like portion that gradually narrows toward the tip side. Here, in a state where the airbag 30 is inflated and deployed, the connecting portion 44 as a whole is formed in a conical bag shape with the opening peripheral edge portion 36e for the connecting portion as a bottom portion. Therefore, when the main bag portion 32 is observed from the outside, a hole gradually narrowing toward the back side is formed in a portion of the main bag portion 32 opposite to the passenger seat 16.

  However, it is not essential that the connecting portion 44 has such a shape, and a portion of the connecting portion 44 may have a shape portion that gradually becomes narrower toward the tip side. The portion 44 may have a cylindrical shape.

  Furthermore, it is not essential that the connecting portion has a bag shape, and the connecting portion may have a band shape. In this case, without forming the connecting portion opening peripheral portion 36e in the main bag portion 32, one end portion of the connecting portion is integrated or positioned at a position facing the opening peripheral portion 35e in the main bag portion 32. It is good also as a structure connected by sewing etc. Moreover, the connection part may be provided only in one side of a pair of base fabric 50 mentioned later.

  The connecting portion 44 is connected to the sub bag portion 40 as follows, thereby connecting the sub bag portion 40 to the main bag portion 32 at a position opposite to the opening peripheral edge portion 35e.

  That is, the generatrix of the sub-bag portion 40 in the conical bag shape (here, the whole) and the generatrix of the connecting portion 44 in the shape of the conical bag (here, the whole) are joined by stitching or the like. ing. Thereby, the sub bag part 40 and the connection part 44 are connected, and the sub bag part 40 is connected in the main bag part 32 by this connection structure. Here, since the sub-bag portion 40 and the connecting portion 44 are connected in the above-described manner, the distal end portion of the sub-bag portion 40 is opposite to the opening peripheral edge portion 35e (that is, the connecting peripheral opening peripheral edge portion 36e portion). ) And reaches the inner surface of the main bag portion 32, and the tip of the connecting portion 44 reaches the inner surface of the main bag portion 32 on the opposite side of the connecting portion opening peripheral portion 36e (that is, the opening peripheral portion 35e portion). But the shape of the subbag part 40, the shape of the connection part 44, and those connection aspects are not restricted to the said example. Each of these modified examples will be described later with reference to the drawings.

  A method for manufacturing the airbag 30 will be described below.

  First, as shown in FIG. 7, a pair of base fabric 50, the 1st small base fabric 60, and the 2nd small base fabric 70 are prepared.

  The pair of base fabrics 50, the first small base fabric 60, and the second small base fabric 70 are members formed in a predetermined shape by cutting a sheet-like member such as a cloth or a resin sheet, respectively.

  The base fabric 50 is configured such that the right half or the left half of the airbag 30 can be configured. Here, the base fabric 50 is configured as a single sheet-like member having a main panel portion 52, a sub-panel portion 54, and a connecting panel portion 56. The main panel portion 52 is a portion constituting the main bag portion 32, and is formed in a shape in which a right half portion or a left half portion of the large bag portion 33 of the main bag portion 32 is developed. The sub-panel portion 54 is a portion constituting the sub-bag portion 40, and here, is formed in a shape (here, a triangular shape) in which the right half or the left half of the sub-bag portion 40 is developed. The sub panel portion 54 is provided so as to extend outward from a part of the outer periphery of the main bag portion 32. Further, the connection panel portion 56 is a portion constituting the connection portion 44, and here, is formed in a shape (here, a square shape) in which the right half or the left half of the connection portion 44 is developed. The connecting panel portion 56 is provided so as to extend outward from a portion on the outer periphery of the main bag portion 32 and opposite to the sub panel portion 54.

  The first small base cloth 60 and the second small base cloth 70 are portions constituting the small bag portion 34 in the main bag portion 32. Here, the 1st small base cloth 60 is formed in the shape which expand | deployed the upper part of the small bag part 34, and the 2nd small base cloth 70 is formed in the shape which expand | deployed the lower part of the small bag part 34. FIG. That is, a part constituting the airbag 30 may be constituted by a base fabric different from the base fabric 50 constituting most of the airbag 30. Of course, some or all of the base fabric 50, the first base fabric 60, and the second base fabric 70 may be configured by overlapping a plurality of sheet-like members.

  And as shown in FIG. 8, the 1st small base fabric 60 and the 2nd small base fabric 70 are arrange | positioned between a pair of base fabrics 50, and the 1st small base fabric 60 and the 2nd small base fabric 70 are halved. Fold it.

  Thereafter, as shown in FIG. 9, the first small base fabric 60 and the second small base fabric 70 are disposed on the pair of base fabrics 50 and joined to the pair of base fabrics 50 by sewing or the like (hereinafter referred to as “suture”). (This will be explained in terms of joining) In addition, in FIGS. 9-17, the joining line is shown with the thick dotted line. Then, as shown in FIG. 10, the first small base cloth 60 and the second small base cloth 70 are integrated with the pair of base cloths 50 while being folded between the pair of base cloths 50.

  Thereafter, as shown in FIG. 11, a part of the peripheral part of the pair of base fabrics 50, that is, a part of the peripheral part of the main panel part 52, a peripheral part of the sub-panel part 54, and a peripheral part of the connecting panel part 56. Sew together. Thereby, the bag-shaped sub-panel part 54 and the bag-shaped connection panel part 56 are formed.

  Subsequently, in FIG. 12, portions of the peripheral edge portion of the main panel portion 52 that are recessed inward are stitched together. Then, as shown in FIG. 13, the first small base fabric 60 and the second small base fabric 70 are pulled out from between the pair of base fabrics 50. After that, as shown in FIG. 14, the first small base fabric 60 and the second small base fabric 70 are brought close to each other and a part of the peripheral portions thereof is sewn together, and the first peripheral base portion 50 of the pair of base fabrics 50 is The parts that are brought into contact with each other by the approach of the first small base cloth 60 and the second small base cloth 70 are stitched together. Then, as shown in FIG. 15, the remaining portions of the peripheral portions of the first small base fabric 60 and the second small base fabric 70 are stitched together. Thereby, the bag-shaped main bag part 32 is formed.

  The stitches of the peripheral portions of the pair of base fabrics 50, the first small base fabric 60, and the peripheral portions of the second small base fabric 70 may be performed in any order. That is, the main bag portion 32, the sub bag portion 40, and the connecting portion 44 may be formed by sewing the peripheral portions of the pair of base fabrics 50 together.

  Next, as shown in FIGS. 16 and 17, the sub-bag portion 40 and the connecting portion 44 are connected. Thereby, the sub bag part 40 is connected to the part arrange | positioned inside the main bag part 32 in the state which the main bag part 32 inflate-deployed in the bag shape via the connection part 44. FIG. Here, the bus bar of the sub-bag portion 40 and the bus bar of the connecting portion 44 are joined by stitching or the like.

  Then, when the main bag portion 32 is turned over through the gas supply port 32h or the like so that the sub bag portion 40 is disposed in the main bag portion 32, the airbag 30 is completed.

  The inflator 22 and the like are attached to the airbag 30.

  The operation of the airbag 30 configured as described above will be described.

  First, as shown in FIG. 18, it is assumed that an occupant P is normally seated on the passenger seat 16 and is wearing a seat belt. The state in which the occupant P is seated in the passenger seat 16 in a normal state refers to a state in which the occupant P is seated with the back portion in contact with the seat back.

  In this state, when the vehicle collides, the airbag 30 is inflated and deployed. The inflated and deployed airbag 30 is recessed at the opening peripheral edge 35e facing the occupant P's head. Further, the airbag 30 is greatly inflated around the opening periphery 35e.

  At this time, a force for moving the occupant P forward is applied due to the sudden deceleration of the vehicle. However, the occupant P is restrained mainly by the seat belt around the waist. As a result, the head, shoulder, and chest of the occupant P tend to move forward and obliquely downward about the waist.

  Then, the head of the occupant P is received by the airbag 30 while entering the subbag portion 40. Since the sub-bag portion 40 is formed as a kind of bag, shock absorption is performed according to the shape of the sub-bag portion 40. That is, as in the present embodiment, the impact of the head can be gradually received by making the shape of the sub-bag portion 40 gradually smaller toward the distal end side. In addition, by appropriately adjusting the length of the sub-bag portion 40 (that is, the depth of the hole viewed from the outside of the main bag portion 32), it is possible to appropriately adjust the position for finally receiving the head of the passenger P. it can.

  In addition, since the head enters the sub-bag portion 40, warping is also suppressed.

  Further, around the sub-bag portion 40 (that is, around the opening peripheral edge portion 35e), the airbag 30 is greatly inflated and deployed and is somewhat hardened. For this reason, about a shoulder part, a chest part, etc., an impact can be absorbed in a part around the subbag part 40 with a high impact absorption effect.

  Further, as shown in FIG. 19, it is assumed that an occupant P is seated in the passenger seat 16 in a normal state and does not wear a seat belt.

  If the vehicle collides in this state, the airbag 30 is inflated and deployed in the same manner as described above.

  Further, unlike the above, the occupant P is not restrained by the seat belt, and therefore the occupant P tries to move forward with the sitting posture unchanged. In other words, unlike the case shown in FIG. 18, the head tries to move forward as it is.

  Even in this case, the head of the occupant P is received by the airbag 30 while entering the subbag portion 40. Since the sub-bag portion 40 is formed as a kind of bag, it is possible to expect shock absorption according to the shape of the sub-bag portion 40 as described above.

  Similarly to the above, with respect to the shoulder portion, the chest portion, and the like, the impact can be absorbed at the portion around the subbag portion 40 where the impact absorbing effect is high.

  In addition, as shown in FIG. 20, when the occupant P is in an irregular posture (OOP (Out Of Position)), that is, when the occupant P is disposed with the head close to the instrument panel 10. Suppose.

  In this state, when the vehicle collides, the airbag 30 is inflated and deployed. The inflated airbag 30 is inflated and deployed above the instrument panel 10 by gas injection from the inflator 22, hits the front window 12, and then descends on the instrument panel 10 toward the passenger seat 16 side. Inflates and expands.

  Under the present circumstances, the opening peripheral part 36e for connection parts is formed in the position corresponding to the passenger | crew's P head on the instrument panel 10 in the airbag 30, and it is dented. For this reason, the head on the instrument panel 10 enters into the recess formed by the connecting portion 44, and the relatively hard portion of the airbag 30 that is inflated and deployed and the head of the occupant P that is in an irregular posture. Direct contact is suppressed.

  According to the airbag 30 configured as described above and the manufacturing method thereof, the portion around the opening peripheral edge portion 35e of the main bag portion 32 is inflated and deployed relatively large, thereby configuring a portion having a high impact absorbing effect. be able to. And in this part, a shoulder part, a chest, etc. can be received firmly and shock absorption can be carried out. On the other hand, in the opening peripheral edge portion 35e, a bag-like portion that is recessed from the surface of the main bag portion 32 is formed by the sub-bag portion 40. For this reason, in this part, it is possible to receive the head softer than the part around the opening peripheral part 35e and absorb the shock. The shock absorbing mode by the sub-bag portion 40 includes the shape of the sub-bag portion 40 (the size of the opening, how to narrow the opening, etc.), and the connecting mode by the connecting portion 44 (the position of the tip of the sub-bag portion 40, etc.). It can set suitably by setting etc. That is, the subbag portion 40 can constitute a portion having an appropriate impact absorbing effect. Thereby, in the airbag 30, the part with a high impact absorption effect and the part which has a moderate shock absorption effect can be mixed, and the part which has a moderate shock absorption effect can be provided locally.

  In addition, since the bag-shaped sub-bag portion 40 extends from the opening peripheral portion 35e formed in the main bag portion 32 into the main bag portion 32, the periphery of the opening peripheral portion 35e of the main bag portion 32 is around. The curved surface (see arrow A in FIG. 3) at the boundary between the portion and the sub-bag portion 40 can be made relatively small. In other words, the entrance of the sub-bag portion 40 can be made as small as possible, and a portion having an appropriate impact absorbing effect can be provided more locally. As a result, the occupant P can be brought into contact with the airbag 30 that is inflated and deployed as early as possible so that the occupant P moves toward the front of the vehicle, which is advantageous for the initial restraint of the occupant P.

  Moreover, since the opening peripheral part 35e is provided in the position which receives the head of the passenger | crew P who seated on the passenger seat 16, it can receive a head with the subbag part 40 provided in the opening peripheral part 35e. It is possible to suppress the reaction force against the head.

  Moreover, since the subbag part 40 has the part formed in the bag shape which becomes thin gradually toward the front end side, if a head etc. enter in the subbag part 40, an impact will be absorbed gradually. For this reason, the impact by a vehicle collision can be received more softly.

  Further, since the airbag 30 that is inflated and deployed covers the head or the like of the passenger P in a non-regular posture, the main bag portion 32 of the airbag 30 is formed because it is formed in the bag-like portion of the connecting portion 44. Direct contact with the head is suppressed.

  Moreover, since the bus line of the sub bag part 40 and the bus line of the connection part 44 are joined, the expansion | deployment shape of the sub bag part 40 and the expansion | deployment shape of the connection part 44 in the main bag part 32 which expand | deploys are expanded. In particular, the shape of the sub-bag portion 40 that is recessed from the opening periphery 35e is stabilized. Thereby, the operation | movement of the head which penetrates into the subbag part 40 and its inside is stabilized, and the shock absorption operation | movement by the subbag part 40 is stabilized.

  The pair of base fabrics 50 includes a main bag portion 32 and a sub bag portion 40. Then, the pair of base fabrics 50 are joined together to form the main bag portion 32 and the sub bag portion 40, and the sub bag portion 40 is connected to a portion disposed inside the main bag portion 32, and the main bag portion If 32 is turned upside down, the airbag 30 recessed in the subbag part 40 can be manufactured. For this reason, it is not necessary to sew the subbag portion 40 separately from the main bag portion 32, and the airbag 30 having a recess can be easily manufactured.

  Moreover, since the peripheral parts should just be sewn on a plane in the state which piled up a pair of base fabric 50, a three-dimensional sewing location can be suppressed and the airbag 30 can also be manufactured easily also from this point.

  In addition, since it is not necessary to provide a joint portion along the boundary between the main bag portion 32 and the sub bag portion 40, the joint portion can be eliminated at the entrance of the sub bag portion 40. Thereby, in the expansion | deployment state of the airbag 30, the curved-surface shape between the main bag part 32 and the subbag part 40 can be formed in a continuous shape, and stress concentration can be suppressed.

  Moreover, since the two base fabrics 50 which comprise the right half part and the left half part of the airbag 30 are used, the airbag 30 can be manufactured by using the two base fabrics 50 as a main part.

  Thus, by using the first small base cloth 60 and the second small base cloth 70, the degree of freedom of the airbag shape can be improved. In particular, the width of the airbag 30 can be easily adjusted. For example, as in the present embodiment, the small bag portion 34 protruding from the large bag portion 33 can be easily formed.

  Moreover, the gas supply port 32h (inflator attachment hole) can be formed in the small bag part 34 which protrudes from the large bag part 33 like this embodiment. Thereby, the gas supply port 32h (inflator attachment hole) can be provided avoiding the sewing line of cloth. Further, since the cloth around the gas supply port 32h can be realized by one kind of base cloth, the cloth can be easily set according to the demand for strength and the like.

  The shape of the subbag portion 40 and the connection configuration of the subbag portion 40 and the connecting portion 44 are not limited to the above examples, and various modifications can be considered.

  For example, as shown in FIG. 21, the length dimension of the subbag portion 40B corresponding to the subbag portion 40 (the depth dimension from the opening peripheral edge portion 35e) is such that the airbag 30 is in an inflated and deployed state. It may be set to such an extent that it does not reach the opposite side portion of the opening peripheral edge 35e. In addition, the distal end portion of the coupling portion 44B corresponding to the coupling portion 44 and the distal end portion of the sub-bag portion 40B may be joined by sewing or the like. In other words, the connecting portion 44B is configured to connect the sub bag portion 40B to the main bag portion 32 in a state where the tip portion of the sub bag portion 40B is disposed at a position away from the inner surface of the main bag portion 32. Yes.

  According to this modification, since the tip of the sub bag portion 40B does not reach the opposite side of the main bag portion 32, the opposite side of the main bag portion 32B can be obtained even if the head enters deeply into the sub bag portion 40B. Before reaching the portion, it hits the bottom (tip) of the sub-bag portion 40B. For this reason, the situation (also referred to as bottoming) in which the head or the like hits the member on the opposite side via the airbag 30 can be suppressed, and the shock can be effectively absorbed in the subbag portion 40B. In this way, by adjusting the length (depth) of the sub-bag portion 40B in a state where the main bag portion 32 is inflated and deployed, the head or the like finally enters the sub-bag portion 40B. The position for receiving the head or the like can be adjusted, and thereby the impact absorption characteristics of the sub-bag portion 40B can be adjusted.

  In addition, as shown in FIG. 22, the sub bag portion 40 </ b> C corresponding to the sub bag portion 40 may have a shape with a larger opening. Thus, when the opening shape of the sub-bag portion 40C changes, the shock absorption characteristics of the head and the like that have entered the sub-bag portion 40C change. For example, if the opening shape is small as in the case of the sub-bag portion 40, the head or the like becomes a resistance at the initial stage when it enters the sub-bag portion 40, so that it is possible to absorb the impact at an early stage. Further, if the opening shape is large as in the subbag portion 40C, the shock absorption effect is enhanced in the later stage because the resistance is not so much at the initial stage when the head or the like enters the subbag part 40C. Therefore, by appropriately setting the opening shape of the sub bag portion, it is possible to adjust the shock absorption characteristics of the head that enters the inside of the sub bag portion.

  Further, as shown in FIG. 23, the sub-bag portion 40D corresponding to the sub-bag portion 40 and the connecting portion 44D corresponding to the connecting portion 44 are connected in an upside down positional relationship as compared to the above embodiment. Also good.

  Moreover, as shown in FIG. 24, the connection part 44E equivalent to the connection part 44 may be formed in strip | belt shape. In this case, one end of the connecting portion 44E is connected to the main bag portion 32 integrally or by stitching, and the other end of the connecting portion 44E is connected to the tip of the sub bag portion 40E corresponding to the sub bag portion 40. It is good to be connected by integral or sewing.

  Further, for example, as shown in FIG. 25, even in the main bag portion 132 corresponding to the main bag portion 32, an opening peripheral portion 135e corresponding to the opening peripheral portion 35e is formed at a position corresponding to the chest of the occupant P. Good. In this case, the sub-bag portion 140 corresponding to the sub-bag portion 40 extends from the opening peripheral edge portion 135e corresponding to the chest portion into the main bag portion 132. And the connection part 144 equivalent to the connection part 44 is connected with the subbag part 140 by the aspect similar to the said embodiment. In this modification, the chest can be received relatively softly.

  Further, as shown in FIG. 26, the sub-bag portion 140B corresponding to the sub-bag portion 140 and the connecting portion 144B corresponding to the connecting portion 144 are connected in an upside down relationship as compared with the example shown in FIG. It may be.

  Further, as shown in FIG. 27, a connecting portion 144C corresponding to the connecting portion 144 may be formed in a band shape. In this case, one end portion of the connecting portion 144C is connected to the main bag portion 132 integrally or by stitching, and the other end portion of the connecting portion 144C is connected to the distal end portion of the sub bag portion 140C corresponding to the sub bag portion 140. It is good to be connected by integral or sewing.

  As shown in FIG. 28, in the main bag portion 132D corresponding to the main bag portion 32, an opening peripheral portion 135De corresponding to the opening peripheral portion 35e is formed at a position corresponding to the chest of the occupant P and the lower portion thereof. Also good. In this case, the sub-bag portion 140D corresponding to the sub-bag portion 40 extends from the chest and the opening peripheral portion 135De corresponding to the lower portion thereof into the main bag portion 132D. A connecting portion 144D (here formed in a band shape) corresponding to the connecting portion 44 is connected to the main bag portion 132D and the sub bag portion 140D. Here, the connecting portion 144 </ b> D is connected to the upper portion of the main bag portion 132. Thus, the location that is the connection destination of the sub-bag portion need not be the front portion of the main bag portion.

  For example, as shown in FIG. 29, in the main bag portion 232 corresponding to the main bag portion 32, an opening peripheral portion 235e corresponding to the opening peripheral portion 35e is formed at a position corresponding to the head and chest of the occupant P. It may be. In this case, the subbag portion 240 corresponding to the subbag portion 40 extends from the opening peripheral edge portion 235e corresponding to the chest portion into the main bag portion 232. And the connection part 244 equivalent to the connection part 44 is connected with the subbag part 240 by the aspect similar to the said embodiment. In this modification, the head and chest can be received relatively softly.

  Moreover, the connection part which connects the subbag part 40 grade | etc., To the inside of the main bag part 32 grade | etc., Does not need to be comprised by the sheet-like member. For example, the tip of the sub-bag portion 40 in the above embodiment may be connected to the inside of the main bag portion 32 by sewing with a thread or the like. In this case, a suture thread is used as the connecting portion.

  In addition, each structure demonstrated in the said embodiment and each modification can be suitably combined unless it mutually contradicts.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Instrument panel 16 Passenger seat 20 Air bag apparatus 22 Inflator 30 Air bag 32, 32B, 132, 132D, 232 Main bag part 32h Gas supply port 40, 40B, 40C, 40D, 40E, 140, 140B, 140C, 140D, 240 Sub-bag portion 44, 44B, 44D, 44E, 144, 144B, 144C, 144D, 244 Connection portion 50 Base fabric 52 Main panel portion 54 Sub-panel portion 56 Connection panel portion

Claims (8)

A method of manufacturing an airbag that is accommodated in a folded state in a front part of a passenger seat of a vehicle and that can be inflated and deployed by gas supply,
(a) a main panel portion constituting a main bag portion that can be inflated and deployed in a bag shape toward the occupant side, and formed so as to partially extend from the outer periphery of the main panel portion, from the main bag portion A step of preparing a plurality of base fabrics having a sub-panel portion constituting a bag-like sub-bag portion recessed inside thereof;
(b) joining the peripheral portions of the plurality of base fabrics to form the main bag portion and the sub bag portion;
(c) connecting the sub-bag portion to a portion disposed inside the main bag portion in a state where the main bag portion is inflated and deployed in a bag shape;
(d) turning the main bag portion over so that the sub-bag portion is disposed within the main bag portion;
An airbag manufacturing method comprising: A method of manufacturing an airbag according to claim 1,
The method for manufacturing an airbag, wherein the two base fabrics constituting the right half and the left half of the airbag are prepared as the plurality of base fabrics. A method of manufacturing an airbag according to claim 1 or 2,
The method for manufacturing an airbag, wherein the sub-bag portion is formed in a shape having a bag-like portion that gradually narrows toward the tip side. It is a manufacturing method of the airbag given in any 1 paragraph of Claims 1-3,
At least one of the plurality of base fabrics has a connection panel portion formed so as to partially extend from the outer periphery of the main panel portion,
In the step (c), the subbag portion is connected to the connection panel portion, thereby connecting the subbag portion to the main bag portion via the connection panel portion. It is a manufacturing method of the airbag given in any 1 paragraph of Claims 1-3,
The plurality of base fabrics are formed so as to partially extend from the outer periphery of the main panel portion, and at a position different from the sub-bag portion, a bag-like connection portion recessed from the main bag portion to the inside thereof. Having a connecting panel part to constitute,
In the step (b), by joining the peripheral portions of the plurality of base fabrics, the connecting portion is formed,
In the step (c), the subbag portion is connected to the connecting portion, thereby connecting the subbag portion to the main bag portion via the connecting portion. A method of manufacturing an airbag according to claim 3,
The plurality of base fabrics are formed so as to partially extend from the outer periphery of the main panel portion, and are recessed inward from the main bag portion at a position different from the sub bag portion, and on the tip side thereof. Having a connecting panel portion constituting a connecting portion having a bag-like portion that gradually narrows toward the
In the step (b), by joining the peripheral portions of the plurality of base fabrics, the connecting portion is formed,
In the step (c), a bus bar of the bag-shaped portion that gradually narrows toward the tip side of the sub-bag portion, and a bus bar of the bag-shaped portion that gradually narrows toward the tip side of the connecting portion. A method for manufacturing an airbag, which joins together. It is a manufacturing method of the airbag given in any 1 paragraph of Claims 1-6,
In the step (a), in addition to the plurality of base fabrics having the main panel portion and the sub panel portion, a small base fabric is prepared,
In the step (b), the small base fabric is also joined to the plurality of base fabrics. An airbag that is accommodated in a folded state in a front part of a passenger seat of a vehicle and that can be inflated and deployed by gas supply,
A main bag portion that can be inflated and deployed in a bag shape toward the passenger side, and a sub bag portion that is recessed from the main bag portion to the inside thereof,
Peripheral portions of a plurality of base fabrics having a main panel portion constituting the main bag portion and a sub panel portion constituting the sub bag portion formed so as to partially extend from an outer periphery of the main panel portion. By being joined, the main bag portion and the sub bag portion are formed, and the sub bag portion is disposed inside the main bag portion with the main bag portion inflated and deployed in a bag shape. The airbag is connected to the part to be used.