JP2010006132A - Airbag for front passenger seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag for a front passenger seat capable of stabilizing the height and projection form, from a recessed groove, of right-left restraining projection parts in an occupant restraining part just after completing inflation. <P>SOLUTION: This airbag 15 for the front passenger seat has the occupant restraining part 33 on the rear surface side when completing the inflation. The occupant restraining part has a restraining projection part 34 juxtaposed on the right and left so as to extend in the vertical direction and the recessed groove 35 recessed forward between both restraining projection parts. The rear part side 26 of the inner peripheral edge 23 of the airbag of the recessed groove 35 has a large curvature part 27 recessed by increasing curvature, a ceiling side edge part 28 extending to the front side from the upper end of the large curvature part, and a bottom side edge part 29 extending to the front side from the lower end of the large curvature part. A regulating member 37 is arranged on the rear part inner peripheral edge 26. The regulating member has a first tether 38 for connecting the ceiling side edge part 28 and the bottom side edge part 29, and a second tether 39 extending from the first tether and connected to the inner peripheral edge 26. Communication openings 40 and 41 penetrating in the lateral direction are arranged on both edges of the second tether. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an airbag for a top-mount type airbag device for a passenger seat that is disposed on the upper surface side of an instrument panel in front of a passenger seat.

  Conventionally, in a top-mount type passenger seat airbag, the airbag is folded and stored on the upper surface side of the instrument panel in front of the passenger seat of the vehicle, and protrudes upward when the inflating gas flows in. The vehicle was deployed and inflated to the rear side of the vehicle so as to close the space between the windshield above the instrument panel. In addition, this type of passenger-side airbag has a substantially quadrangular pyramid shape with a top portion on the front end side when deployed and inflated, and the rear surface side is disposed along a substantially vertical direction to receive the occupant. The restraint portion is provided, and an inflow opening through which inflation gas flows is provided on the lower surface on the front side. Then, the occupant restraint portion can receive both the left and right shoulders of the occupant, and the restraint convex portion arranged side by side so as to extend vertically on both the left and right sides of the occupant restraint portion and the left and right restraint convex portions in the vertical direction. And a concave groove that is disposed along the front side and is recessed toward the front side (for example, Patent Documents 1 to 3). The bottom surface of the concave groove is the head of the occupant after the occupant restraining portion has received the right and left shoulders and the vicinity of the side by the restraining convex portions of the occupant restraining portion, and the occupant's forward moving speed is reduced. It was formed to be recessed forward from the constraining convex portion so as to catch the point.

  The outer peripheral wall of such an airbag has a substantially C-shape that respectively constitutes the opposing walls of the left outer panel portion and the right outer panel portion that respectively constitute the left and right side walls, and the left and right constraining convex portions that sandwich the concave groove. Left inner panel portion and right inner panel portion. The left and right constraining convex portions are formed by joining the outer peripheral edges of the left outer panel portion and the left inner panel portion and the outer peripheral edges of the right outer panel portion and the right inner panel portion, respectively. It was. The concave groove is formed by joining the inner peripheral edges of the left inner panel portion and the right inner panel portion.

  Further, in such an airbag, the rear side of the inner peripheral edge of the airbag along the front-rear direction of the concave groove portion is separated from the large curvature portion that is recessed with a larger curvature toward the rear side, and the instrument panel at the large curvature portion. Of the ceiling side edge extending from the remote side end to the front side to the vicinity of the upper position of the inflow opening when the expansion is completed, and the inflow opening on the front side from the near side end near the instrument panel in the large curvature portion. And a bottom edge extending to the vicinity of the front edge.

  Further, on the rear side of the inner peripheral edge of the airbag along the front-rear direction of the concave groove portion, a regulation that can regulate the separation between the ceiling side edge portion and the bottom side edge portion with the large curvature portion when the inflation is completed It was configured by arranging members. By the way, when the deployment of the airbag is completed, if the distance between the ceiling side edge and the bottom side edge increases, the bottom edge side with the large curvature part in between is supported from the top surface to the rear surface of the instrument panel. The side edge of the ceiling side moves to the upper side away from the instrument panel, so that the amount of dents in the groove from the restraint convex portion is reduced, and the shoulder portion in this type of airbag is restrained and softened. It is difficult to secure a mode of restraining the passenger's head.

And as a conventional regulation member, one belt-like tether (refer patent documents 1 and 2) which pulls the ceiling side edge side to the bottom side edge side, or the bottom side edge from the ceiling side edge side There was a crescent-shaped tether (sewing allowance) (see Patent Document 3) arranged so as to close the inner peripheral edge of the large curvature portion extending to the side.
JP 2006-103670 A JP 2008-037358 A JP 2008-018936 A

  However, in the conventional single belt-like tether, the portion of the large curvature portion between both ends of the tether separation side end and the proximity side end itself moves rearward so as to reduce the depth of the groove. There is room for improvement in that the projecting situation cannot be suppressed, and the substantially entire region of the concave groove is recessed by a predetermined distance from the constraining convex portion.

  Moreover, in the conventional crescent-shaped tether, there was room for improvement regarding the behavior at the time of expansion | deployment expansion | swelling of a right-and-left restraint convex part. That is, in this type of airbag, the inflation gas flowing in from the inflow opening is separated into the left and right at the inner peripheral edge of the groove portion so that the vicinity of the large curvature portion is the downstream end of the flow. When the flow rate of the inflation gas flowing into the left and right restraint projections varies from side to side, the inner circumferential surface side of the restraint projections flows from the front side to the rear side. As a result, the protruding height from the concave groove varies, or the protruding direction of the left and right constraining protrusions varies toward the outside direction or the inside direction. The left and right shoulders of the moving occupant will not be able to receive it in a straight line.

  The present invention solves the above-described problems, and provides an airbag for a passenger seat that can stabilize the height and protruding form of the left and right restraint projections from the recessed grooves in the occupant restraint immediately after completion of inflation. The purpose is to do.

An airbag for a passenger seat according to the present invention is folded and housed on the upper surface side of an instrument panel in front of a passenger seat of a vehicle, and protrudes upward when an inflating gas flows in, and further includes an upper surface of the instrument panel and an instrument. It expands and inflates to the rear side of the vehicle so as to block the windshield above the panel, and the shape at the time of completion of expansion and expansion is made into a substantially quadrangular pyramid shape with a top on the front end side, and the rear surface side in a substantially vertical direction An airbag for a passenger's seat configured as an occupant restraint portion that receives the occupant by being disposed along the front surface, and is provided with an inflow opening through which inflation gas flows into the lower surface on the front side.
The occupant restraint portion can receive both the left and right shoulders of the occupant so that the restraint convex portion juxtaposed so as to extend in the vertical direction on both the left and right sides of the occupant restraint portion and the left and right restraint convex portions along the vertical direction And a concave groove that is disposed on the front side and is recessed on the front side.
The outer peripheral wall of the airbag is a substantially left C-shaped left and right outer panel part that constitutes the left and right side walls, respectively, and the opposing walls of the left and right restraint convex parts that sandwich the groove. An inner panel portion and a right inner panel portion.
The left and right restraint convex portions are formed by joining the outer peripheral edges of the left outer panel portion and the left inner panel portion, and the outer peripheral edges of the right outer panel portion and the right inner panel portion, respectively.
A concave groove is formed by joining the inner peripheral edges of the left inner panel portion and the right inner panel portion,
The rear side of the inner peripheral edge of the airbag along the front-rear direction of the groove portion is a large curvature portion that is recessed with a larger curvature on the rear side, and a front side from the remote end on the side away from the instrument panel in the large curvature portion. And the bottom edge that extends from the near end near the instrument panel in the large curvature portion to the vicinity of the front edge of the inflow opening on the front side. And a passenger seat configured to dispose a regulating member capable of regulating the separation between the ceiling side edge portion and the bottom side edge portion with the large curvature portion when the expansion is completed. For airbags,
The restriction member
A first tether that connects the ceiling side edge and the bottom side edge with the large curvature portion therebetween, and both ends that extend from the first tether and are connected to the ceiling side edge and the bottom side edge of the first tether And at least one second tether connected to the rear side of the inner peripheral edge of the airbag at the portion of the groove between the parts,
The second tether is provided with a communication opening penetrating in the left-right direction on both edges in the direction orthogonal to the axis.

  In the passenger seat airbag according to the present invention, on the rear side of the inner peripheral edge of the airbag along the front-rear direction of the groove portion, in addition to the first tether that can pull the ceiling side edge to the bottom edge side At least one second tether is disposed. The second tether extends from the first tether and is connected to the rear side of the inner peripheral edge of the airbag at the recessed groove portion between both ends connected to the ceiling side edge and the bottom side edge of the first tether. Therefore, it is possible to prevent the portion of the large curvature portion from projecting backward so as to make the concave groove shallow. That is, the first tether does not leave the ceiling side edge portion between the large curvature portion in the area on the rear side from the inflow opening so as to be separated from the bottom edge portion supported on the upper surface side of the instrument panel. Since the position is restricted and the second tether can restrict the protrusion of the portion of the large curvature portion, the substantially entire area of the concave groove can be recessed by a predetermined distance from the restraining convex portion. The protrusion height from the concave groove of the part can be stabilized.

  Further, on both edges in the direction orthogonal to the axis of the second tether, a communication opening penetrating in the left-right direction is provided, and the expansion gas flowing in from the inflow opening opens the downstream end of the flow to the vicinity of the large curvature portion. Thus, when the inner peripheral surface side of the left and right restraint projections flows from the front side to the rear side, the left and right restraint projections expand even if the inflow amount flowing into the left and right restraint projections is uneven. When the flow is almost completed, it is possible to flow through the communication opening to the side where the inflow is insufficient, so that the expansion completion state of the right and left restraint projections can be balanced with as much as possible, and the expansion is completed Immediately after the left and right restraint projections can be stabilized so that the projection height and the projection direction from the concave groove are equal to each other, even if the occupant moves forward to the left and right restraint projections immediately after the completion of expansion The left and right restraint projections are near the left and right shoulders of the occupant. To slip, it can be received directly opposite.

  Furthermore, since the second tether itself extends from the first tether, the first tether and the second tether can be integrally configured, and the second tether can be made unnecessary to be coupled to the first tether. It becomes.

  Therefore, in the passenger seat airbag according to the present invention, the height and the protruding form of the left and right restraint convex portions in the occupant restraint portion immediately after the completion of inflation can be stabilized, and further, without any trouble, First and second tethers can be provided.

  In addition, the regulating member provided with the first and second tethers may be formed integrally with the left inner panel cloth or the right inner panel part, but it is one piece separated from the left inner panel part or the right inner panel part. It is formed from a flexible sheet-like tether member, and this tether member is sewn together when the inner peripheral edges of the left inner panel portion and the right inner panel portion are joined together. May be. In the case of such a configuration, a tether member is disposed in the passenger seat airbag of the conventional configuration, and the protrusion height and the protrusion form from the concave grooves in the right and left restraint protrusions immediately after completion of the inflation can be easily obtained. It can be stabilized. Further, in such a configuration, a material that is less likely to stretch than the base fabric that forms the outer peripheral wall of the airbag itself can be selected as the tether member. In this case, in the left and right restraint convex portions immediately after the completion of the inflation. The protruding height and protruding form from the recessed groove can be stabilized.

  In this case, the tether member is formed from a woven fabric formed by weaving warp and weft, and the direction of the warp or weft is arranged along at least one axial direction of the first tether or the second tether. Then, the extension of the tether with the axial direction arranged in the direction along the warp and weft can be suppressed, and the deformation of the inner peripheral edge of the groove portion can be effectively prevented by simply selecting the arrangement of the thread in the woven fabric. (The protrusion height and protrusion form from the groove in the left and right constraining protrusions can be stabilized).

  Further, in this case, the tether member is constituted by projecting the second tether so as to be orthogonal to the first tether from near the center between both ends connected to the ceiling side edge and the bottom side edge of the first tether. If the warp or weft of the woven fabric is disposed along the axial direction of the first tether and the second tether, the elongation of the first and second tethers can be suppressed, and the grooves The deformation of the inner peripheral edge of the part can be prevented, and the protruding height and protruding form from the groove in the left and right constraining protrusions can be stabilized.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, an airbag for a passenger seat (hereinafter simply referred to as an airbag) 15 according to the embodiment includes an instrument panel (hereinafter referred to as an “instrument panel”). The instrument panel is used for a top-mount type airbag device M for a passenger seat that is disposed inside the upper surface 2 side of 1. The passenger seat airbag apparatus M includes a folded airbag 15, an inflator 8 that supplies inflation gas to the airbag 15, a case 6 that stores and holds the airbag 15 and the inflator 8, and an airbag 15. A retainer 11 for attaching to the case 6 and an airbag cover 10 covering the folded airbag 15 are provided.

  In the present specification, the up / down, front / rear, and left / right directions correspond to the up / down, front / rear, and left / right directions of the vehicle in a straight traveling state of the vehicle.

  The airbag cover 10 is formed integrally with the instrument panel 1 made of synthetic resin, and is configured such that when the airbag 15 is deployed and inflated, the front and rear door portions 10a and 10b are pushed by the airbag 15 to open. ing. Further, a connecting wall portion 10 c connected to the case 6 is formed around the door portions 10 a and 10 b of the airbag cover 10.

  The inflator 8 includes a substantially cylindrical main body portion 8 a having a plurality of gas discharge ports 8 b and a flange portion 8 c for attaching the inflator 8 to the case 6.

  The case 6 is formed in a substantially rectangular parallelepiped shape made of a sheet metal having a rectangular opening on the upper end side, a substantially rectangular plate-like bottom wall portion 6a to which the inflator 8 is inserted from below and attached to the outside of the bottom wall portion 6a. And a peripheral wall portion 6b that extends upward from the periphery and engages the connecting wall portion 10c of the airbag cover 10. The case 6 is provided with a bracket (not shown) connected to the vehicle body side at the bottom wall 6a.

  Note that the airbag 15 and the inflator 8 include a plurality of bolts 11 a of an annular retainer 11 disposed in the airbag 15, the airbag 15, the bottom wall portion 6 a of the case 6, and the flange of the inflator 8. The nut 8 is fixed to the case 6 by passing through the portion 8c.

  The airbag 15 includes a bag body 16, a tether member 37 disposed in the bag body 16, and a rectifying cloth 43 disposed in the bag body 16. As shown in FIGS. 2 to 5, the bag body 16 has a substantially square pyramid-shaped bag with the front end as a top when the inflation is completed, and the outer peripheral wall 17 is disposed on the upper surface 16 a side. 16 is arranged on the upper wall 17a and the lower surface 16b side so as to come into contact with the windshield 4, and the lower wall 17b is supported on the upper surface 2 side and the rear surface 3 of the instrument panel 1, and the left wall 17c is disposed on the left side surface 16c. The right side wall 17d is disposed on the right side surface 16d, and the rear wall 17e is disposed on the rear surface 16e side. In particular, the bag body 16 according to the embodiment has the rear surface 16e as an occupant restraint portion 33 that receives the occupant, and the upper surface 16a, the lower surface 16b, the left side surface 16c, and the right side surface 16d of the remaining portions other than the occupant restraint portion 33 are described above. As described above, the vehicle body side portion 18 is brought into contact with the upper surface 2 and the rear surface 3 of the instrument panel 1 or the windshield 4. Also, the bag body 16 according to the embodiment has a circular opening on the lower surface on the front side of the vehicle body side portion 18 in the vicinity of the center in the left-right direction so that the inflation gas flows into the bag body 16. An inflow opening 19 for attaching 18a to the case 6 is provided and configured.

  A plurality of mounting holes 20 are formed in the opening peripheral edge 18 a of the inflow opening 19 for inserting the bolt 11 a of the retainer 11 and attaching the opening peripheral edge 18 a of the inflow opening 19 to the bottom wall portion 6 a of the case 6. ing. In addition, vent holes 31 for exhausting excess inflation gas are provided in the left side wall 17c and the right side wall 17d of the bag body 16, respectively.

  As shown in FIGS. 3 to 5, the occupant restraint portion 33 is juxtaposed so as to extend vertically on both the left and right sides of the occupant restraint portion 33 so that the left and right shoulders of the occupant can be received when the inflating of the bag body 16 is completed. The constraining convex portion 34 (34L, 34R) and the concave groove 35 that is arranged along the vertical direction between the left constraining convex portion 34L and the right constraining convex portion 34R and is recessed forward. The bottom surface 35a of the groove 35 is after the left and right shoulders and side portions of the occupant are received by the left restricting convex portion 34L and the right restricting convex portion 34R of the occupant restricting portion 33, and the forward moving speed of the occupant is reduced. The occupant's head in a state of being made becomes a part to receive.

  Further, the concave groove 35 is formed between the inner peripheral edges 54a and 55a (see FIGS. 5 and 6) of the substantially C-shaped left inner panel portion 54 and the right inner panel portion 55 that constitute the outer peripheral wall 17 of the bag body 16. It is formed by a joined site 46 (sutured suture site in the embodiment) 46. Specifically, the concave groove 35 is formed from the outer peripheral portion of the stitched portion 46.

  The left inner panel portion 54 and the right inner panel portion 55 are arranged at the center in the left-right direction of the rear wall 17e, the upper wall 17a, and the lower wall 17b of the outer peripheral wall 17 of the bag body 16, and are left-constrained convex. The opposing walls of the portion 34L and the right restricting convex portion 34R are configured. Further, as shown in FIGS. 5 and 6, the left restricting convex portion 34 </ b> L connects the outer peripheral edges 50 a and 54 b of the left outer panel portion 50 and the left inner panel portion 54 constituting the left wall 17 c of the bag body 16. It is formed by a coupling site (sutured suture site in the embodiment) 45 (45L). Furthermore, the right restraint convex portion 34R is a coupling portion (in the case of the embodiment) in which the outer peripheral edges 51a and 55b of the right outer panel portion 51 and the right inner panel portion 55 constituting the right side wall 17d of the bag body 16 are coupled to each other. This is formed by a stitched suture site 45 (45R).

  The concave groove 35 is formed in a state where the outer peripheral edges 54b, 55b of the left inner panel portion 54 and the right inner panel portion 55 having a substantially C shape (substantially crescent shape) are connected to the restraining convex portions 34 (34L, 34R). The left inner panel is formed by connecting the peripheral edges 54a and 55a to each other without providing a pulling member such as a tether for pulling to the inflow opening 19 side on the inner peripheral edge 23 side in the bag body 16 of the groove 35. The part 54 and the right inner panel part 55 itself have a structure in which a concave groove 35 that is recessed forward can be formed between the left and right restraint convex parts 34 (34L, 34R) (see FIG. 4).

  As shown in FIG. 4, the inner side of the inner peripheral edge 23 of the concave groove 35 in the bag body 16 at the completion of the inflation is substantially oval shaped so as to communicate between the left and right constraining convex portions 34 (34L, 34R). The communication hole 22 is formed. The inner peripheral edge 23 of the communication hole 22, in other words, the inner peripheral edge 23 of the bag body 16 along the front-rear direction of the concave groove 35 is the front inner peripheral edge 24 that is the front side above the inflow opening 19. And a rear side inner peripheral edge 26 which is the rear side above the inflow opening 19. The rear side inner peripheral edge 26 extends forward from a large curvature portion 27 that is recessed with a larger curvature toward the rear side, and a separation side end (upper end in the illustrated example) 27a on the side away from the instrument panel 1 in the large curvature portion 27. When the expansion is completed, the ceiling side edge portion 28 extends to the vicinity of the upper position of the inflow opening 19, and the front edge of the inflow opening 19 on the front side from the near side end (lower end in the illustrated example) 27 b near the instrument panel 1 in the large curvature portion 27. And a bottom edge 29 extending to the vicinity. In the case of the first embodiment, as shown in FIG. 7, the large curvature portion 27 has an arc shape that reduces the curvature radius (radial dimension) RB (about 150 mm in the embodiment), and the ceiling side edge portion 28 has a large curvature. It is formed in an arc shape having a smaller curvature than the portion 27, in other words, an arc shape having a radius dimension RU larger than the radius dimension RB (about 500 mm in the embodiment), and the bottom edge 29 has a curvature larger than that of the large curvature portion 27. In the case of the embodiment, it is formed as a straight line. The inner peripheral edge 23 is formed from the inner peripheral edge side of the suture site 46.

  In the embodiment, a flexible sheet-like tether is used as a regulating member that can regulate the separation between the ceiling side edge portion 28 and the bottom side edge portion 29 with the large curvature portion 27 in between when the expansion is completed. A member 37 is provided. As shown in FIGS. 4 and 7, the tether member 37 is formed of a woven fabric formed by weaving synthetic fibers such as polyamide and polyester forming the bag body 16 by plain weaving or the like. The tether member 37 includes a first tether 38 that connects the ceiling side edge portion 28 and the bottom side edge portion 29 with the large curvature portion 27 therebetween, and the instrument panel 1 of the first tether 38 that extends from the first tether 38. One second tether 39 connected to the rear side inner peripheral edge 26 between both ends of a remote side end (upper end in the example) 38a and a close side end (lower end in the example) 38b close to the instrument panel 1 And is configured.

  In the case of the embodiment, as shown in FIGS. 4 and 7, the separation side end 38 a on the upper end side away from the instrument panel 1 in the first tether 38 and the proximity side end 38 b on the lower end side approaching the instrument panel 1 are vertically The width dimension WU, WD in the front-rear direction is gradually curved and widened from the width dimension WM in the front-rear direction of the middle portion 38c at the center in the direction. Further, the remote side end 38a is connected to the ceiling side edge portion 28 in a wide area from the rear end 28b of the ceiling side edge portion 28 to the vicinity of the front end 28a as a state of entering the vicinity of the remote side end 27a of the large curvature portion 27. Further, the proximity side end 38b also enters the vicinity of the proximity side end 27b of the large curvature portion 27, and in the wide area from the rear end 29b of the bottom side edge 29 to the vicinity of the front end 29a, the bottom side edge 29 Is bound to.

  In the case of the embodiment, the second tether 39 has an axial direction HD with respect to the axial direction VD along the vertical direction of the first tether 38 (in other words, the axial direction connecting the separation-side end 38a and the proximity-side end 38b) VD. Are extended from the base portion 39a side integrated with the intermediate portion 38c of the first tether 38 so that the tip portion 39b is connected to both end portions of the large curvature portion 27 (separate side end 27a, proximity). It is connected to the intermediate part 27c between the side ends 27b).

  Further, the tether member 37 is arranged such that the directions of the warp VS and the weft HS of the tether material 57 made of woven fabric are aligned with the axial direction VD of the first tether 38 or the axial direction HD of the second tether 39. (Refer to FIG. 7) When the inner peripheral edges 54a and 55a of the left inner panel portion 54 and the right inner panel portion 55 are joined together, they are sewn together with the reinforcing cloths 68 and 68.

  The second tether 39 has a small width dimension WS between both edges in the axis orthogonal direction SD, and in other words, the first tether 38 and the large curvature portion 27 of the rear side inner peripheral edge 26. The communication openings 40, 41 penetrating in the left-right direction are disposed between the two (see FIGS. 4 and 5).

  As shown in FIG. 4, the rectifying cloth 43 is disposed in the bag body 16 so as to cover the upper side of the inflow opening 19, and the inflation gas G flowing from the inflow opening 19 is forward and backward. It is made into the substantially cylindrical shape which opened both ends of the front-back direction so that commutation was possible. That is, in the airbag 15 of the embodiment, the inflation gas G that has flowed from the inflow opening 19 flows into the bag body 16 from the front and rear openings 43 a and 43 b of the rectifying cloth 43. Further, the rectifying cloth 43 has through holes 43c on both the left and right sides that have a smaller opening area than the front and rear openings 43a and 43b and allow the expansion gas flowing in from the inflow opening 19 to escape. . The through-hole 43c is disposed in order to stabilize the direction of the front and rear openings 43a and 43b of the rectifying cloth 43 by allowing a part of the inflation gas G flowing from the inflow opening 19 to escape.

  In the case of the embodiment, the rectifying cloth 43 is composed of two symmetric cloth materials 59 (59L, 59R) that overlap with each other at the portion of the inflow opening 19 as a bilaterally symmetric shape shown in FIG. The end portions 59a separated from each other are joined to each other, and are formed in a cylindrical shape along the axial direction in the front-rear direction.

  As shown in FIG. 6, the bag body 16 includes reinforcing cloths 61, 62, and 63 that reinforce the peripheral edges of the first base cloth 48, the two second base cloths 53 (53 </ b> L and 53 </ b> R), and the inflow opening 19. The reinforcing cloth 65 that reinforces the peripheral edge of the vent hole 31 and the reinforcing cloth 68 that reinforces the inner peripheral edge 23 of the communication hole 22 are formed from a flexible woven cloth such as polyamide or polyester. Has been. Similarly, the rectifying cloth material 59 (59L, 59R) forming the rectifying cloth 43 is also formed of a flexible woven cloth such as polyamide or polyester. Note that the reinforcing cloths 66 and 66 shown in FIG. 6 reinforce the peripheral edge of each through-hole 43c of the rectifying cloth 43. These reinforcing cloths 66 are also woven with flexibility such as polyamide and polyester. It is formed from cloth.

  The first base fabric 48 has a shape in which the left outer panel portion 50 and the right outer panel portion 51 are integrally connected to the left and right sides of a substantially rectangular plate-shaped base portion 49 that forms the opening peripheral edge 18a of the inflow opening 19. Yes. The two second base fabrics 53 (53L, 53R) form a left inner panel portion 54 and a right inner panel portion 55, respectively.

  The manufacturing of the airbag 15 of the embodiment will be described. The reinforcing cloth 65, the peripheral edge of the through hole 43c in the flow regulating cloth materials 59L and 59R and the peripheral edge of the vent hole 31 in the first base cloth 48 are preliminarily provided. 66 is sewn. First, the reinforcing cloth 62 and the rectifying cloth materials 59L and 59R are sequentially stacked on the first base cloth 48 in a flatly deployed state, and the reinforcing cloth is used at the position that becomes the peripheral edge of the reinforcing cloth 62 by using a suture thread. 62 and the flow regulating fabric materials 59L and 59R are sewn to the first base fabric 48. Thereafter, the reinforcing cloths 61 and 63 are sequentially stacked on the straightening cloth material 59R, and sutures are used at the opening peripheral edge 18a of the inflow opening 19 and the peripheral edge of the reinforcing cloth 63. Then, the reinforcing cloths 61, 62, and 63 and the rectifying cloth materials 59L and 59R are sewn to the first base cloth 48. Thereafter, the inflow opening 19 and the attachment hole 20 are formed by drilling. Next, the end portions 59a of the rectifying cloth materials 59L and 59R are sewn together to form the rectifying cloth 43.

  Next, the second base fabrics 53L and 53R are overlapped with each other, and further, the reinforcing fabrics 68 and 68 and the tether material 57 are overlapped, and the second base fabric 53L is interposed between the reinforcing fabric 68 and the tether material 57. , 53R (the left inner panel portion 54 and the right inner panel portion 55), the stitched portion 46 is formed along the concave groove 35 with the inner peripheral edges 54a and 55a interposed therebetween. Next, the second base fabrics 53L and 53R are opened, the front edge portions 53a and 53a of the second base fabrics 53L and 53R are straightened, and are sewn to the front edge portion 49a of the base portion 49 of the first base fabric 48. In addition, the rear edge portions 53b and 53b of the second base fabrics 53L and 53R are straightened and sewn to the rear edge portion 49b of the base portion 49 of the first base fabric 48. Furthermore, the front and rear edges 49c and 49d of the left edge of the base 49 and the front and rear edges 50b and 50c of the outer peripheral edge 50a of the approaching left outer panel 50 are sewn together, and the base 49 The front and rear end edges 49c and 49d of the right edge and the front and rear end edges 51b and 51c of the outer peripheral edge 51a of the right outer panel 51 are sewn together. And the center part 50d between edge 50b, 50c in the outer periphery 50a of the left outer side panel part 50 of the 1st base fabric 48, and the outer periphery 54b of the 2nd base cloth 53L (left inner panel part 54) mutually. To the center portion 51d between the end edges 51b and 51c of the outer peripheral edge 51a of the right outer panel portion 51 of the first base fabric 48, and the second base fabric 53R. A stitched portion 45 (45R) is formed by sewing the outer peripheral edge 55b of the (right inner panel portion 55) to each other. Next, the left and right edges 61a and 61a on the front side of the reinforcing cloth 61 are sewn in the vicinity of the stitching portions 45L and 45R (see FIG. 2), respectively, so that the seam allowance of the edges is not exposed to the outside. If the inflow opening 19 is used for inversion, the airbag 15 can be manufactured.

  Thereafter, the airbag 11 is folded in a state where the bolt 11a is protruded from each mounting hole 20 and the retainer 11 is disposed therein, and further, around the folded airbag 15 so as not to collapse. Then, it is wrapped with a breakable wrapping sheet 13 (see FIG. 1). Then, the folded airbag 15 is placed on the bottom wall 6 a of the case 6 so that each bolt 11 a protrudes from the bottom wall 6 a of the case 6. Next, the main body 8a of the inflator 8 is inserted into the case 6 from below the bottom wall 6a, and the bolts 11a protruding downward from the bottom wall 6a are inserted through the flange 8c of the inflator 8. Thereafter, when the nut 12 is fastened to each bolt 11 a protruding from the flange portion 8 c of the inflator 8, the folded airbag 15 and the inflator 8 can be attached to the bottom wall portion 6 a of the case 6.

  Then, the peripheral wall portion 6b of the case 6 is locked to the connecting wall portion 10c of the airbag cover 10 in the instrument panel 1 mounted on the vehicle, and a predetermined bracket (not shown) of the case 6 is fixed to the body side portion of the vehicle. Then, the passenger seat airbag device M can be mounted on the vehicle.

  If the inflation gas is discharged from each gas discharge port 8b of the inflator 8 at the time of a frontal collision of the vehicle after mounting the airbag device M for the passenger seat on the vehicle, the airbag 15 is inflated and the wrapping sheet 13 is removed. While breaking, the door portions 10a and 10b of the airbag cover 10 are pushed and opened as shown in the two-dot chain line of FIG. 1 and FIG. The airbag 15 protrudes upward from an opening formed by opening the door portions 10a and 10b of the airbag cover 10, and between the upper surface 2 of the instrument panel 1 and the windshield 4 above the instrument panel 1. As shown in FIG. 8, the vehicle is expanded and inflated toward the rear side of the vehicle to complete the expansion, as shown in FIG.

  And in the airbag 15 of embodiment, in the rear part side of the inner periphery 23 of the communication hole 22 of the bag main body 16 along the front-back direction of the site | part of the groove 35, ie, the rear side inner periphery 26, the ceiling side edge part 28 is provided. In addition to the first tether 38 that can be pulled toward the bottom edge 29, a second tether 39 is provided. The second tether 39 extends from the first tether 38 and is connected to the rear side inner peripheral edge 26 between both ends of the separation side end 27a and the proximity side end 27b of the first tether 38. It is possible to prevent the portion from projecting backward so as to make the concave groove 35 shallow. That is, the first tether 38 is supported with the ceiling side edge portion 28 between the large curvature portion 27 in the area on the rear side from the inflow opening 19, with the door portion 10 b interposed on the upper surface 2 side of the instrument panel 1. The position is regulated so as not to leave the bottom edge 29. Further, since the second tether 39 can regulate the protrusion of the portion of the large curvature portion 27, the substantially entire area of the concave groove 35 can be recessed from the restraining convex portion 34 by a predetermined distance DL (see FIG. 5). As a result, it is possible to stabilize the protruding height PH of the left and right restricting convex portions 34 from the concave grooves 35.

  Further, on both edges of the second tether 39 in the direction perpendicular to the axis (width direction) SD, communication openings 40 and 41 penetrating in the left-right direction are provided, and the expansion gas G flowing in from the inflow opening 19 The inner peripheral surface side of the left restricting convex portion 34L and the right restricting convex portion 34R passes from the front side to the rear side through the opening 43a on the front side of the rectifying cloth 43 so that the vicinity of the large curvature portion 27 is the downstream end of the flow. And when flowing through the opening 43b on the rear side of the rectifying cloth 43 so that the inner peripheral surface side of the left restricting convex portion 34L and the right restricting convex portion 34R flows from the lower side to the upper side. Even if the entire inflow amounts flowing into the left restricting convex portion 34L and the right restricting convex portion 34R are unequal, when the left restricting convex portion 34L and the right restricting convex portion 34R substantially complete the expansion, the inflow Since it becomes possible to flow into the insufficient side through the communication openings 40 and 41, Force, it is possible to perform a well-balanced completely inflated state of the left restraining protrusions 34L and the right restraining protrusions 34R. As a result, in the bag body 16, the left and right restraint convex portions 34 (34L, 34R) immediately after the completion of expansion can be stabilized so that the projecting height PH and the projecting direction from the concave groove 35 are equal to each other, Therefore, even if the occupant P moves forward with respect to the left and right restraint protrusions 34 (34L, 34R) immediately after completion of the inflation, the left and right restraint protrusions 34 (34L, 34R) are left and right shoulders PS of the occupant P. The vicinity can be received smoothly and directly (see FIG. 8).

  Further, the second tether 39 itself extends from the first tether 38, and the first tether 38 and the second tether 39 can be integrally formed, so that the connection work of the second tether 39 to the first tether is unnecessary. It is also possible to make it.

  Therefore, in the airbag 15 of the embodiment, the protrusion height PH and the protrusion form of the left and right restraint convex portions 34 (34L, 34R) from the concave grooves 35 in the occupant restraint portion 33 immediately after the inflation can be stabilized. In addition, the first tether 38 and the second tether 39 can be arranged as much as possible without any trouble.

In the embodiment, the substantially total opening area (opening area opened on the inner peripheral side of the inner peripheral edge 23) OA (see FIG. 4) OA (see FIG. 4) of the communication openings 40 and 41 is about 27 cm ^2. About 12 of the substantially closed area (area closing the communication hole 22 from the inner peripheral edge 23) SA (see FIG. 4, in the embodiment, about 230 cm ² ) of the tether member 37 disposed so as to close the hole 22. %. The ratio of the opening area OA of the communication openings 40 and 41 to the closed area SA of the tether member 37 is 5 to 50%, preferably 10 to 45%. If it is too small, it is difficult to ensure the communication state of the expansion gas G. If it is large, each end (the separated side end 38a and the proximity side end 38b of the first tether 38, the tip end 39b of the second tether 39) is included. This is because it becomes difficult to ensure the width dimension of the first tether 38 and the second tether 39, and it becomes difficult to ensure the shape regulation effect of the rear side inner peripheral edge 26. Of course, in order to ensure the communication state of the expansion gas G, the total opening area of the communication openings 40 and 41 (opening area opened on the inner peripheral side of the inner peripheral edge 23) OA is about 27 cm ² or more. It is desirable to do.

  Further, in the embodiment, the case where the regulating member is configured by a single sheet-like tether member 37 is shown, but the regulating member may be formed by a plurality of sheet materials. For example, the second tether 39 is separately provided in the first tether member 37. The regulating member may be configured by being coupled to the 1 tether 38 using stitching or adhesion.

  Furthermore, in the embodiment, a sheet-like tether member 37 having one flexibility that is separate from the left inner panel portion 54 and the right inner panel portion 55 is used as the regulating member. In the case of the illustrated example, the tether member (regulating member) 37A including the first tether 38A and the second tether 39A, as shown in the airbag 15A shown in the figure, at least one of the left inner panel cloth and the right inner panel portion, It may be formed integrally with the left inner panel portion 54A. However, when the tether member 37 is formed separately from the left inner panel portion 54 and the right inner panel portion 55 as in the embodiment, the tether member 37 is formed of the left inner panel portion 54 and the right inner panel portion 55. When the inner peripheries 54a and 55a are joined together by sewing, they can be easily sewn together. In the case of such a configuration, the tether member 37 is disposed in the passenger seat airbag (bag body 16) of the conventional configuration, and the right and left restraint convex portions 34 (34L immediately after completion of the inflation) can be easily obtained. , 34R), the protrusion height PH and the protrusion form from the groove 35 can be stabilized. Further, in such a configuration, as the tether member 37, a material that is less likely to stretch than the base fabric constituting the outer peripheral wall 17 of the airbag itself (bag main body 16 itself) can be selected. It is possible to stabilize the protrusion height PH and the protrusion form from the concave groove 35 in the restricting convex portions (34L, 34R).

  Further, in this case, as in the embodiment, the tether member 37 is formed from a tether material 57 made of a woven fabric formed by weaving warp and weft, and the direction of the warp VS or the weft HS is set to the first tether. 38 or the second tether 39 along at least one axial direction VD, HD, the extension of the tether having the axial directions VD, HD in the direction along the warp VS or weft HS can be suppressed. The deformation of the inner peripheral edge 23 of the portion of the concave groove 35 can be efficiently prevented by simply selecting the arrangement of the thread lines in the woven fabric (the protruding height from the concave groove 35 in the left and right constraining convex portions 34 (34L, 34R)). Can stabilize the PH and protruding form).

  In particular, in the case of the embodiment, the tether member 37 is connected to the axial direction VD of the first tether 38 from the intermediate portion 38c near the center between the both ends of the separation side end 38a and the proximity side end 38b of the first tether 38. The second tether 39 is projected rearward in the orthogonal axial direction HD, and the warp VS or weft HS of the woven fabric is aligned along the axial directions VD and HD of both the first tether 38 and the second tether 39. Both the first tether 38 and the second tether 39 can be restrained from stretching, and the inner peripheral edge 23 of the groove 35 can be more efficiently prevented from being deformed. The projecting height PH and the projecting form of the constraining convex part 34 (34L, 34R) from the concave groove 35 can be stabilized.

  If the above points are not taken into consideration, the second tether 39B may be disposed so as not to intersect perpendicularly with the first tether 38B like the tether member 37B of the airbag 15B shown in FIG. In this case, the second tether 39B may extend from the intermediate portion 38c of the first tether 38A, or may extend from the separation side end 38a and the proximity side end 38b of the first tether 38A (see FIG. In the example, it extends from the proximal end 38b).

  Further, as in the tether member 37C of the airbag 15C shown in FIG. 12, if the communication openings 42 penetrating in the left-right direction are disposed on both edges in the axis orthogonal direction SD, the second tether 39C 39a is arranged on the first tether 38C, and a plurality (two in the illustrated example) are arranged so as to extend from the first tether 38C, and each tip 39b is connected to the remote side end 38a of the first tether 38. You may connect with the rear side inner periphery 26 between the near side ends 38b. As the tether member in this case, as shown in parentheses in FIG. 12, communication openings 42 are disposed on both edges of each second tether 39D, and the leading end 39b of the second tether 39D, A tether member 37D made of a single tether material 57D having a shape in which the separation side end 38a and the proximity side end 38b of the one tether 38D are continuously connected may be used.

  Furthermore, in the airbag 15 of the embodiment, the rear side inner peripheral edge 26 of the communication hole 22 is illustrated above the upper surface 2 of the instrument panel 2, but as shown in FIG. 13, the rear part of the communication hole 22E A regulating member (tether member) 37E may also be provided on the airbag 15E that extends rearward and downward so that the side inner peripheral edge 26 approaches the rear surface 3 of the instrument panel 2, and in that case, for communication Unlike the embodiment in which the openings 40 and 41 are arranged in the vertical direction, the communication openings 40E and 41E arranged at both edges in the axis orthogonal direction SD of the second tether 39E are arranged in the front and rear directions. The amount of the expansion gas flowing into the constraining convex portions 34, 34 may be adjusted.

It is sectional drawing of the vehicle front-back direction of the airbag apparatus for passenger seats using the airbag for passenger seats which is one Embodiment of this invention. It is the perspective view seen from the front side of the state where the airbag of the embodiment was inflated alone. It is the perspective view seen from the back side of the state where the airbag of an embodiment was inflated alone. It is sectional drawing along the front-back direction of the state which expanded the airbag of embodiment alone. It is sectional drawing of the state which expanded the airbag of embodiment alone, and respond | corresponds to the VV site | part of FIG. It is a top view which shows the member which comprises the airbag of embodiment. It is a member which constitutes an airbag of an embodiment, Comprising: It is a top view which sewed a right inner panel part, a left inner panel part, a reinforcing cloth, and a tether member, and developed flatly. It is a figure explaining the use condition of the air bag of an embodiment, and it is the figure seen from the side of vehicles which shows the state where inflation was completed. It is sectional drawing along the front-back direction of the state which expanded the airbag of the modification of embodiment alone. FIG. 10 is a plan view in which a right inner panel portion, a left inner panel portion, and a reinforcing cloth integrated with a tether member used in the airbag shown in FIG. It is sectional drawing along the front-back direction of the state which expanded the airbag of other embodiment alone. It is sectional drawing along the front-back direction of the state which expanded the airbag of other embodiment alone. It is a figure explaining the use condition of the air bag of other embodiments, and is the figure seen from the side of the vehicles in the state where inflation was completed.

Explanation of symbols

1 ... (Instrument panel) Instrument panel,
15, 15A, 15B, 15C ... airbags,
17 ... outer peripheral wall,
19 ... opening for inflow,
22 ... Communication hole,
26 ... rear side inner periphery,
27 ... Large curvature part,
27a ... remote side end (of large curvature part),
27b ... the near side end (of the large curvature part),
28 ... Ceiling side edge,
29 ... Bottom edge,
33 ... Crew restraint,
34, 34L, 34R ... restraining convex part,
35 ... concave groove,
37, 37A, 37B, 37C, 37D (regulating member) tether member,
38, 38A, 38B, 38C, 38D ... the first tether,
38a ... remote end (of the first tether),
38b ... the proximal end (of the second tether),
39, 39A, 39B, 39C, 39D ... the second tether,
40, 41, 42 ... opening for communication,
50 ... Left outer panel,
50a ... outer peripheral edge (on the left outer panel),
51. Right outer panel,
51a ... outer peripheral edge (on the right outer panel),
54 ... Left inner panel,
54a ... inner peripheral edge (left inner panel part) 54b ... outer peripheral edge (left inner panel part),
55 ... Right inner panel,
55a ... inner peripheral edge (on the right inner panel),
55b ... outer peripheral edge (on the right inner panel),
VS ... warp,
HS ... Weft.

Claims (4)

Folded to the top side of the instrument panel in front of the passenger seat of the vehicle and protrudes upward when the inflation gas flows in, and between the top surface of the instrument panel and the windshield above the instrument panel The vehicle is deployed and inflated to the rear side of the vehicle so as to close, and the shape at the time of completion of expansion and expansion is made into a substantially quadrangular pyramid shape with a top on the front end side, and the rear surface side is arranged along a substantially vertical direction to catch the occupant A passenger seat airbag configured as an occupant restraint portion and provided with an inflow opening for allowing inflation gas to flow into a lower surface on the front side,
The occupant restraint portion is capable of receiving both left and right shoulders of the occupant, and is vertically arranged between a restraint convex portion juxtaposed so as to extend vertically on both left and right sides of the occupant restraint portion and the left and right restraint convex portions. And a concave groove that is disposed along the front side and is recessed toward the front side.
The outer peripheral wall of the airbag has a substantially C-shape that respectively constitutes left and right outer panel portions and right outer panel portions that respectively constitute left and right side walls, and opposing walls of the left and right restraint convex portions that sandwich the concave groove. Left inner panel portion and right inner panel portion,
The left and right constraining convex portions connect the outer peripheral edges of the left outer panel portion and the left inner panel portion and the outer peripheral edges of the right outer panel portion and the right inner panel portion, respectively. Formed,
The concave groove is formed by combining inner peripheral edges of the left inner panel portion and the right inner panel portion,
The rear side of the inner peripheral edge of the airbag along the front-rear direction of the concave groove portion has a large curvature portion that is recessed with a larger curvature on the rear side, and a separation side that is away from the instrument panel in the large curvature portion. A ceiling-side edge extending from the end to the front side and extending to the vicinity of the upper position of the inflow opening when expansion is completed, and in front of the inflow opening on the front side from the proximal end near the instrument panel in the large curvature portion And a bottom-side edge extending to the vicinity of the edge, and a regulating member capable of regulating the separation between the ceiling-side edge and the bottom-side edge with the large curvature portion in between when the expansion is completed In the airbag for the passenger seat configured by arranging
The regulating member is
A first tether that connects the ceiling side edge and the bottom side edge with the large curvature portion therebetween, and the ceiling side edge and the bottom side edge of the first tether extending from the first tether And at least one second tether connected to the rear side of the inner peripheral edge of the airbag at the portion of the concave groove between both ends connected to the part, and
An airbag for a passenger seat, characterized in that a communication opening penetrating in the left-right direction is provided on both edge sides of the second tether in the direction perpendicular to the axis. The regulating member is formed of a sheet-like tether member having one flexibility that is separate from the left inner panel portion and the right inner panel portion,
Inner peripheral edges of the left inner panel portion and the right inner panel portion are joined together by stitching,
2. The passenger seat air according to claim 1, wherein the tether member is arranged to be sewn together when the inner peripheral edges of the left inner panel portion and the right inner panel portion are stitched together. 3. bag.   The tether member is formed of a woven fabric formed by weaving warp and weft, and the direction of the warp or weft is arranged along at least one axial direction of the first tether or the second tether. The passenger-side airbag according to claim 2, wherein the passenger-side airbag is provided. The second tether projects from the vicinity of the center between both ends connected to the ceiling side edge and the bottom side edge of the first tether so that the tether member is orthogonal to the first tether. Composed,
4. The passenger seat airbag according to claim 3, wherein warps or wefts of the woven fabric are disposed along an axial direction of the first tether and the second tether. 5.

Images