JP2006008083A - Air bag for front passenger seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air bag for a front passenger seat which enables an occupant side wall part to be vertically widely deployed in an early stage of expansion. <P>SOLUTION: An almost cylindrical straightening fabric 36 with both opened ends in front and rear directions is arranged in an air bag main body 15 to cover an upper side of a gas inflow port 21 and straighten expansion gas flowed from the gas inflow port 21 in the air bag 14 for the front passenger seat. Preliminarily folded shape is a shape in which a peripheral wall part 18 is folded and flatly superposed from an upper side to a lower side of a peripheral wall part 18 while an almost all area of the occupant side wall part 16 being flatly deployed. A part in the vicinity of a connecting position with an upper edge of the occupant side wall part 16 in a peripheral wall part 18 is folded in with a valley folding line CH along left and right directions. The folding line CH is arranged rearwardly of a rear edge 20b of the gas inflow port 21. The straightening fabric 36 is arranged to locate a rear end 36a near the folding line CH and forwardly thereof at completion of preliminary folding. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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 (hereinafter referred to as “instrument panel”) in front of the passenger seat.

Conventionally, in an airbag for a passenger seat, the airbag includes an airbag body and a rectifying cloth disposed in the airbag body so as to cover an upper side of a gas inlet formed in the airbag body. It was a structure (for example, refer patent document 1). The airbag body has, as a shape at the time of completion of deployment, an occupant side wall portion arranged along the substantially vertical direction on the occupant side, a peripheral wall portion narrowed in a substantially conical shape from the outer peripheral edge of the occupant side wall portion to the vehicle front side, The gas inflow port is arranged as an opening surface along the substantially horizontal direction on the front side on the lower side of the peripheral wall portion when the expansion and expansion are completed. In the conventional passenger seat airbag, when the airbag is deployed and inflated, the occupant side wall portion can be quickly disposed along the substantially vertical direction so that the occupant is placed on the lower side of the folded peripheral wall portion. After the side wall portion is overlapped from above and preliminarily folded so as to have a flat shape, the folded airbag is stored by performing horizontal folding and vertical folding.
JP 2002-255004 A

  In general, in the airbag device for the passenger seat, it is desirable to inflate the airbag body with the occupant side wall portion being widely deployed up and down at the initial stage of inflation of the airbag from the viewpoint of accurately protecting the occupant. In general, the protruding direction of the airbag at the initial stage of inflation of the airbag is greatly affected by the inflow direction of the inflation gas into the airbag. However, in the conventional passenger airbag, Although the airbag is pre-folded so that the occupant side wall can be quickly arranged along the substantially vertical direction during deployment and inflation, the airbag is inflated into the airbag body at the initial stage of inflation. Regarding the control of the gas inflow direction, the relation between the rectifying cloth and the occupant side wall has not been considered.

  The present invention solves the above-described problems, and an object of the present invention is to provide a passenger-seat airbag capable of widely deploying the occupant side wall portion vertically in the initial stage of inflation.

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 includes an upper surface of the instrument panel and a windshield above the instrument panel. It is configured to expand and expand to the rear side of the vehicle so as to block between
As a shape at the time of completion of deployment and expansion, a shape including an occupant side wall portion arranged along a substantially vertical direction on the occupant side and a peripheral wall portion narrowed in a substantially conical shape from the outer peripheral edge of the occupant side wall portion to the vehicle front side. In addition, an airbag main body configured by disposing a gas inlet as an opening surface along a substantially horizontal direction on the front side on the lower side of the peripheral wall portion at the time of completion of deployment,
In the airbag main body, a substantially cylindrical rectifying cloth that is disposed so as to cover the upper side of the gas inlet and that opens both ends in the front-rear direction so as to rectify the inflation gas flowing in from the gas inlet. When,
And is configured to include
After pre-folding, it is configured to be folded and stored by performing horizontal folding to fold along the left-right direction and vertical folding to fold along the front-rear direction,
The pre-folding shape at the time of pre-folding is
Folding the peripheral wall part, with the substantially entire area of the occupant side wall part being flattened, and being flattened from the upper side to the lower side of the peripheral wall part,
The vicinity part of the connecting part with the upper edge of the passenger side wall part in the peripheral wall part is folded with a valley fold along the left-right direction,
An airbag for a passenger seat, the fold being shaped to be located rearward from the rear edge of the gas inlet,
The rectifying cloth is
When the airbag is deployed and inflated, it is disposed in the airbag body so that at least the upper side of the opening at the front and rear ends protrudes upward from the upper surface of the instrument panel,
When the preliminary folding is completed, the rear end is disposed so as to be positioned on the front side in the vicinity of the fold,
When the airbag is folded laterally after completion of the preliminary folding, a fold along the left-right direction is set so that the rear end side of the preliminary folded airbag is close to the gas inlet side. In addition, it is folded by roll folds wound around the peripheral wall portion side.

  In the passenger seat airbag according to the present invention, when inflation gas flows in from the gas inlet, the rectifying cloth is inflated so as to protrude upward from the upper surface of the instrument panel, and the openings provided at both front and rear ends of the rectifying cloth Therefore, the inflation gas flows into the airbag body, and the airbag body completes the inflation.

  Then, when the rectifying cloth is inflated and the inflating gas flows into the airbag body from the rear end opening of the rectifying cloth, the inflating gas eliminates the roll folding around the rear portion of the gas inlet. In the airbag body from the front side near the fold of the valley fold formed by folding the vicinity of the connection portion with the upper edge of the occupant side wall portion in the peripheral wall portion toward the rear side along the instrument panel upper surface. Inflow. At this time, the portion on the upper edge side of the occupant side wall portion positioned on the front side from the fold at the time of the pre-folding (this is referred to as the upper edge side portion) is accompanied by the elimination of the roll folding at the rear side portion of the gas inlet. Thus, the inflation gas is opened at the rear side of the fold so as to be able to flow in. In addition, the lower side of the occupant side wall portion of the airbag body located at the rear side of the fold at the time of the pre-folding (this is referred to as the lower edge side) does not eliminate the roll fold. Is difficult to flow into the lower edge side portion, flows into the upper edge side portion, and further, the upper edge side portion is joined with the inflation gas flowing from the front end opening side of the rectifying cloth to the airbag body side, The upper edge side portion expands so that the passenger side wall portion on the edge side portion side stands along the substantially vertical plane.

  And, further, if the inflation gas flows into the airbag body from the rear end opening of the rectifying cloth, the occupant side wall portion on the upper edge side portion side is moved rearward in a state of standing substantially along the vertical plane, The lower edge side portion that has been rolled is expanded while sequentially unwinding.

  And since the inflation gas flows into the airbag body also from the front end opening of the rectifying cloth, the upper edge side portion is further inflated, and the passenger side wall portion on the upper edge side portion side and the passenger side wall portion on the lower edge side portion side are As a result, in the passenger seat airbag according to the present invention, in the early stage of inflation of the airbag, the occupant side wall is widely expanded vertically along the substantially vertical direction to move backward. Will be.

  Therefore, in the passenger seat airbag of the present invention, the occupant side wall portion can be widely deployed vertically in the initial stage of inflation, and even if the approaching occupant advances, the occupant sidewall that is widely deployed vertically By the part, it can protect exactly.

  The length of the rectifying cloth in the front-rear direction is shortened, and the rear end of the rectifying cloth is on the front side of the fold and is arranged between the rear edge of the gas inlet and the fold. In the airbag, when the roll fold is canceled and the inflation gas flows into the airbag body from the rear end opening of the rectifying cloth, the cancellation of the roll fold is reached before reaching the fold portion described above. The front side portion of the fold in the peripheral wall portion of the airbag body is inflated, and further, if the cancellation of the folding of the roll fold reaches the above-described fold portion, the upper edge side portion is inflated. Only the upper edge portion of the occupant side portion is greatly inflated, that is, the airbag is greatly expanded upward, and it is difficult to expand the occupant side wall portion vertically in the initial stage of inflation of the airbag.

  Conversely, in an airbag having a configuration in which the length dimension of the rectifying cloth in the front-rear direction is increased and the rear end of the rectifying cloth is disposed on the rear side of the fold, the rectifying cloth is in the initial stage of inflation of the airbag. The inflation gas that has flowed out from the opening on the rear end side flows into the airbag body along the horizontal direction, not downward, so that the occupant side wall portion is widely deployed vertically in the early stage of inflation of the airbag. It was difficult.

  Further, in the passenger seat airbag according to the present invention, a valley fold in the vicinity of the upper edge of the passenger side wall portion in the peripheral wall portion at the time of preliminary folding is disposed on the rear side from the gas inlet, and the gas inlet is provided. The rear end of the covered rectifying cloth is positioned in front of the fold of the valley fold in the vicinity of the upper edge of the occupant side wall in the peripheral wall during preliminary folding, and the occupant side wall is moved up and down at the initial stage of inflation of the airbag. Such a pre-folding configuration is a configuration that can be easily achieved when the position of the upper edge side of the occupant side wall portion that overlaps from the upper side to the lower side of the peripheral wall portion from the gas inlet is long. is there. In other words, if the substantially conical peripheral wall at the time of expansion is long in the front-rear direction, the upper edge of the occupant side wall overlapped from the upper side on the lower side of the peripheral wall is disposed at a position away from the gas inlet to the rear side. An airbag having a substantially conical peripheral wall portion that is long in the front-rear direction when the inflation is completed is an airbag having a long distance from the gas inlet to the occupant side wall, and is located near the gas inlet. When the airbag is folded and stored and deployed and inflated, the airbag is arranged so that the side wall of the occupant is located rearward from the storage part.In other words, the passenger in the passenger seat is positioned away from the storage position. The present invention is suitable for a passenger seat airbag mounted on such a vehicle.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, an airbag 20 for a passenger seat is a top mount type that is disposed inside an upper panel 2 side of an instrument panel 1. It is used for the passenger seat airbag apparatus M. The passenger seat airbag apparatus M includes a folded airbag 14, an inflator 7 that supplies inflation gas to the airbag 14, a case 6 that stores and holds the airbag 14 and the inflator 7, and the airbag 14. A retainer 10 for attaching to the case 6 and an airbag cover 9 covering the folded airbag 14 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 in a straight traveling state of the vehicle unless otherwise specified.

  The airbag cover 9 is formed integrally with the instrument panel 1 made of synthetic resin, and is configured such that when the airbag 14 is deployed and inflated, the front and rear doors 9a and 9b are pushed by the airbag 14 and opened. ing. Further, a connecting wall portion 9 c connected to the case 6 is formed around the door portions 9 a and 9 b of the airbag cover 9.

  The inflator 7 includes a substantially cylindrical main body portion 7 a having a plurality of gas discharge ports 7 b and a flange portion 7 c for attaching the inflator 7 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-shaped bottom wall portion 6a to which the inflator 7 is inserted from below and attached to the outside of the bottom wall portion 6a. A peripheral wall portion 6b extending upward from the peripheral edge and locking the connecting wall portion 9c of the airbag cover 9. 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 14 and the inflator 7 include a plurality of bolts 10a of an annular retainer 10 disposed in the airbag 14, and the airbag 14, the flange portion 7c of the inflator 7, and the case bottom wall portion 6a. , And the nut 11 is fixed to the case 6.

  The airbag 14 includes an airbag body 15 and a rectifying cloth 36 disposed in the airbag body 15. As shown in FIGS. 2 and 3, the airbag main body 15 is formed from the occupant side wall portion 16 disposed along the substantially vertical direction on the occupant side, and the outer peripheral edge of the occupant side wall portion 16, as the shape when the deployment and inflation are completed. It is set as the shape provided with the surrounding wall part 18 narrowed in a substantially conical shape at the vehicle front side. A gas inlet 21 that is circularly opened and has a peripheral edge attached to the case 6 so as to allow the expansion gas G to flow into the front side of the lower peripheral wall 19 that is the lower side of the peripheral wall 18 when the expansion and expansion are completed. Is disposed. A plurality of attachment holes 22 for attaching the inlet periphery 20 to the bottom wall 6 a of the case 6 by inserting the bolt 10 a of the retainer 10 are formed in the periphery 20 of the gas inlet 21. In addition, a reinforcing cloth 44 having an approximately rectangular shape and an opening corresponding to the inlet (not shown) is disposed on the inlet periphery 20. Further, vent holes 34 for exhausting excess inflation gas are provided in the left and right side portions of the peripheral wall portion 18, respectively. Note that the airbag body 15 has a long distance from the gas inlet 21 to the occupant side wall 16 when the inflation is completed.

  When the airbag 14 is held on the case bottom wall 6 a by the retainer 10, the case 6 is attached to the body side of the vehicle, and the airbag device M is mounted on the vehicle, the opening surface of the gas inlet 21. Are arranged so that the front edge 20a side of the peripheral edge 20 is slightly higher than the rear edge 20b side and along the inflow edge peripheral edge 20 along the substantially horizontal direction (see FIG. 1).

  As shown in FIGS. 2 and 3, the rectifying cloth 36 is disposed so as to cover the upper side of the gas inlet 21 in the airbag main body 15, and the inflation gas G that has flowed in from the gas inlet 21. It is made into the substantially cylindrical shape which opened both ends of the front-back direction so that rectification | straightening was possible in the front-back direction. That is, in the airbag 14 of the embodiment, the inflation gas G that has flowed from the gas inlet 21 flows into the airbag body 15 through the openings 37A and 37B before and after the rectifying cloth 36. As shown in FIGS. 1, 14, and 15, the rectifying cloth 36 is disposed so that the front and rear openings 37 </ b> A and 37 </ b> B protrude above the top surface 2 of the instrument panel 1 when the airbag 14 is deployed and inflated. Has been. In the case of the embodiment, the rectifying cloth 36 has a shape larger than the front / rear / left / right dimensions of the gas inlet 21 and a cross-sectional shape in the front / rear direction facing the vicinity of the center of the gas inlet 21 when the airbag body 15 is deployed and inflated. Is an arcuate curved shape that swells upward away from the gas inlet 21. Further, when the airbag body 15 is preliminarily folded, the rectifying cloth 36 has a rear end 36a in the vicinity of a crease CH, which will be described later, as shown in FIGS. It is set to be located on the front side.

  As shown in FIG. 4, the airbag 14 includes first and second base fabrics 39, 40, a rectifying cloth material 41, and a reinforcing cloth 44 woven from yarns such as polyester and polyamide. The airbag body 15 is manufactured by stitching the peripheral edges of the first and second base fabrics 39 and 40. The first base fabric 39 includes two substantially hexagonal cloth materials (an upper portion 39a and a lower portion). Part 39e) As a connected shape, it is formed in a substantially bowl shape with both left and right edges near the center being recessed, and the second base fabric 40 is formed in a substantially circular shape approximating a substantially regular hexagonal shape. These base fabrics 39 and 40 are set so that the three-dimensional airbag body 15 can be sewn by a flat stitching operation.

  The second base fabric 40 constitutes substantially the entire region of the occupant side wall portion 16 in the airbag main body 15, and the first base fabric 39 constitutes the substantially entire region of the peripheral wall portion 18 in the airbag main body 15. Furthermore, the upper side portion 39 a of the first base fabric 39 constitutes substantially the entire area of the upper side peripheral wall 29 that is the upper side of the peripheral wall portion 18, and the lower side portion 39 e of the first base fabric 39 is the lower side of the peripheral wall portion 18. Thus, substantially the entire lower side peripheral wall 19 is formed. In addition, a gas inlet 21, a mounting hole 22, and a vent hole 34 are formed at predetermined positions of the first base fabric 39.

  The rectifying cloth material 41 constituting the rectifying cloth 36 has a substantially rectangular shape including an opening 42 a corresponding to the gas inlet 21 and a hole 42 b corresponding to the mounting hole 22 while the periphery is sewn to the first base cloth 39. The connecting portion 42 and extending portions 43 and 43 that extend from both the left and right sides of the connecting portion 42 and are sewn to the edges 43a and 43a on the side away from the connecting portion 42 are configured. .

  Next, manufacturing of the airbag 14 of the embodiment will be described. First, as shown in FIG. 5A, the peripheral edge 20 of the gas inlet 21 on the inner peripheral surface side of the airbag body 15 in the first base fabric 39. In addition, the reinforcing cloth 44 and the connecting portion 42 of the rectifying cloth material 41 are sutured using the suture S. Next, as shown in FIG. 5B, the edges 43a and 43a of the extending portions 43 and 43 of the flow regulating cloth material 41 are sewn into an arc shape by using the suture S, and the flow regulating cloth 36 is shaped into a predetermined shape. To form.

  Thereafter, at both the left and right edges of the first base fabric 39 in the vicinity of the gas inlet 21, as shown in FIGS. 5B and 5C, the first reference line extending left and right between the upper portion 39a and the lower portion 39e. Fold at X1 and use the suture S to sew one straight side edge 39b and 39f of the upper and lower side portions 39a and 39e near the reference line X1 and the other straight side edge The parts 39c and 39g are sewn together.

  Next, as shown in FIGS. 5C and 5D, the upper and lower side portions 39a and 39e are stitched together by bending at the second reference line X2 extending in the left and right direction at the position where the upper portion 39a bulges in the left and right direction. The remaining peripheral edges 39d and 39h are spread apart from each other. The outer shape obtained by expanding the remaining peripheral edges 39d and 39h is the same as the outer shape of the second base fabric 40.

  Then, the second base fabric 40 is overlaid on the first base fabric 39, and as shown in FIG. 5E, if the overlapped peripheral edges are sewn together using the suture S, the airbag 14 is formed in a bag shape. can do. Furthermore, after the airbag 14 is formed in a bag shape so that the seam allowance for stitching each part is not exposed on the outer peripheral surface side of the airbag 14, the airbag 14 is turned over using the gas inlet 21. In addition, when the work to turn over using the gas inflow port 21 is difficult, the work of stitching the edges 43a and 43a of the extended portions 43 and 43 of the rectifying cloth material 41 is turned over. Later, the extended portion 43 may be pulled out from the gas inflow port 21 and performed.

  The mounting of the air bag 14 manufactured as described above on the vehicle will be described. First, the air bag 14 is disposed in a state where the retainer 10 is disposed inside the mounting hole 33 so that the bolt 10a protrudes from the mounting hole 33. The folded airbag 14 is wrapped with a breakable wrapping sheet 13 (see FIG. 1) so as not to be folded. Specifically, the airbag 14 is folded through a horizontal folding process and a vertical folding process after the preliminary folding process.

  In the preliminary folding step, a preliminary folded airbag 46 as shown in FIGS. 6 to 8 is formed. In this preliminary folding, the occupant side wall 16 is positioned on the rear side of the gas inlet 21 and is flattened on the lower peripheral wall 19 of the peripheral wall 18 from above. Further, in the case of the embodiment, the peripheral wall portion 18 side is folded so that the substantially entire area of the occupant side wall portion 16 is flat except for a portion of the occupant side wall portion 16 near the left edge 16c and the right edge 16d. Pre-folded so that it can be unfolded.

  In the embodiment, as shown in FIGS. 6 to 11, the preliminary folding of the peripheral wall portion 18 includes the left and right portions 23 and 24 of the gas inlet 21 in the peripheral wall portion 18, and the occupant side wall upper edge 11 a in the peripheral wall portion 18. The vicinity part 30 of the connecting part is folded with valley folds CL, CR, and CH. That is, the folding of the left side portion 23 and the right side portion 24 of the gas inflow port 21 is performed on the substantially intermediate portions 23a and 24a up to the left and right edges 16c and 16d of the occupant side wall portion 16 that are flattened. The gas inlet 21 is moved closer (the creases CL and CR are moved closer to each other) and disposed on the occupant side wall 16 side at the periphery of the gas inlet 21 so that the left and right side parts 23 and 24 are This is done by attaching the folds CL / CR of the valley fold along the direction. In addition, folding of the vicinity 30 on the side of the occupant side wall portion upper edge 16a in the peripheral wall portion 18 is performed from the protruding top portion 31 on the front end side of the fold CL / CR in the front-rear direction in the upper side peripheral wall 29. A substantially intermediate portion 29a extending to 16a is made to approach the gas inlet 21 and arranged on the passenger side wall 16 side of the periphery of the gas inlet 21, so that the upper edge vicinity portion 30 is a valley fold along the left-right direction. It is done by adding CH and folding. As shown in FIGS. 7, 8, and 11, the fold CH is disposed on the rear side from the rear edge 20 b of the gas inlet 21.

  Such preliminary folding is an intermediate portion from the vicinity of the center in the left-right direction on the front edge 20a side of the gas inlet 21 in the peripheral wall 18 to the vicinity of the center in the left-right direction on the upper edge 16a of the occupant side wall. 21 in the front-rear direction so as to grip the part (becomes the protruding top part 31) and the part 16e near the center in the left-right direction in the vicinity of the occupant side wall lower edge 16b and to separate the gripping parts 31 and 16e from each other This can be done by pulling.

  In the case of the embodiment, in the portion 32 from the front side portion 25 of the gas inlet 21 to the protruding top portion 31 in the peripheral wall portion 18, in order to make the peripheral edge 20 of the gas inlet 21 parallel to the passenger side wall portion 16. In addition, the valley is folded so as to approach the gas inlet 21 side.

  Further, in the preliminary folding airbag 46 of the embodiment, the rectifying cloth 36 disposed in the airbag main body 15 is disposed so that the rear end 36a is positioned on the front side in the vicinity of the fold CH. (See FIGS. 7 and 11).

  After the preliminary folding in this way, as shown in FIGS. 12 and 13, the folds along the left-right direction of the rear-side portion 50 and the front-side portion 51 of the gas inlet 21 in the preliminary-folded airbag 46 are arranged. In addition, lateral folding is performed so that the end portions 50 a and 51 a are brought close to the gas inlet 21. In the case of the embodiment, as shown in A of FIGS. 12 and 13, the rear side portion 50 is rolled so that the rear end 50 a is wound around the lower peripheral wall 19 side and placed on the passenger side wall portion 16 side. Folded. Then, as shown in FIGS. 13A and 13B, the front side portion 51 is folded back so that the front end 51a approaches the gas inlet 21 and the rear side portion 50 is placed on the folded folding portion 54, It is folded.

  After the lateral folding, the left side portion 52 and the right side portion 53 of the gas inlet 21 in the airbag 14 after the lateral folding step are arranged in the front-rear direction as shown in FIGS. 13B and 13C. A longitudinal fold is performed so that the ends 52a and 53a are brought close to the gas inlet 21 with a fold along the line. In the case of the embodiment, the left and right side portions 52 and 53 are folded by folding the end portions 52a and 53a around the lower side peripheral wall 19 and folding them on the occupant side wall 16 side. Yes.

  When the folding of the airbag 14 is completed through the lateral folding process, the folded airbag 14 is wrapped with a ruptureable wrapping sheet 13 so as not to collapse as described above. Incidentally, this wrapping sheet 13 may be omitted as appropriate.

  Then, the folded airbag 14 is placed on the bottom wall 6 a of the case 6 while each bolt 10 a is inserted through the case bottom wall 6 a. Next, the main body portion 7a of the inflator 7 is inserted into the case 6 from below the bottom wall portion 6a, and each bolt 10a protruding downward from the bottom wall portion 6a is inserted into the flange portion 7c of the inflator 7. . Then, if the nut 11 is fastened to each bolt 10a protruding from the flange portion 7c of the inflator 7, the folded airbag 14 and the inflator 7 can be attached to the bottom wall portion 6a of the case 6.

  After that, the peripheral wall 6b of the case 6 is locked to the connecting wall 9c of the airbag cover 9 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. The passenger seat airbag device M can be mounted on a vehicle.

  After the airbag device M is mounted on the vehicle, if the inflation gas G is discharged from each gas discharge port 7b of the inflator 7 at the time of a frontal collision of the vehicle, the airbag 14 is expanded and the wrapping sheet 13 is broken. At the same time, the door portions 9a and 9b of the airbag cover 9 are pushed and opened as shown by the two-dot chain line in FIG. The airbag 14 protrudes upward from the opening of the door portions 9a and 9b in the airbag cover 9 and expands and inflates toward the rear side of the vehicle. The two-dot chain line in FIG. As shown in B, the expansion is completed.

  In the passenger seat airbag 14 of the embodiment, when the inflation gas G flows from the gas inlet 21, the rectifying cloth 36 is inflated so as to protrude upward from the instrument panel upper surface 2, and the rectifying cloth 36 The inflation gas GF / GB flows into the airbag body 15 from the openings 37A and 37B provided at both front and rear ends of the airbag, and the airbag body 15 completes the inflation.

  In the airbag 14 of the embodiment, when the rectifying cloth 36 is inflated and the inflation gas GB flows into the airbag main body 15 from the rear end opening 37B of the rectifying cloth 36, as shown in FIG. The working gas GB cancels the winding of the roll folding part 54 of the rear part 50 of the gas inlet 21, from the front side in the vicinity of the fold CH formed in the peripheral wall 18 to the rear side along the instrument panel upper surface 2. Toward the airbag main body 15. At this time, the portion 47 on the upper edge side of the occupant side wall 16 positioned on the front side of the fold CH at the time of preliminary folding is expanded on the rear side of the fold CH as the roll folding portion 54 is unwound. The gas GB is opened to allow inflow (see A in FIG. 14). Further, since the portion 48 on the lower edge side of the occupant side wall portion 16 in the airbag main body 15 located on the rear side from the fold CH at the time of preliminary folding does not cancel the roll folding, the inflation gas GB is below this It is difficult to flow into the edge part 48 and flows into the upper edge part 47, and further, the inflation gas GF flowing from the front end opening 37 </ b> A side of the rectifying cloth 36 to the airbag body 15 side also joins the upper edge part 47. Accordingly, as shown in FIG. 14B, the upper edge side portion 47 expands so that the occupant side wall portion 16f on the upper edge side portion 47 side stands along a substantially vertical plane.

  Further, when the inflation gas GB flows into the airbag body 15 from the rear end opening 37B of the rectifying cloth 36, the occupant side wall portion 16f on the upper edge side portion 47 side stands in a substantially vertical plane. The lower edge side portion 48 that has been roll-folded is expanded while being sequentially unwound while being moved backward.

  Since the inflation gas GF also flows into the airbag body 15 from the front end opening 37A of the rectifying cloth 36, the upper edge side portion 47 is further expanded, and as shown in FIG. The occupant side wall portion 16f is connected to the occupant side wall portion 16g on the lower edge side portion 48 side and moves rearward. As a result, in the passenger seat airbag 14 of the embodiment, the occupant side wall portion is in the initial stage of inflation. The part 16 will expand | deploy widely up and down along a substantially vertical direction, and will move back.

  Therefore, in the passenger seat airbag according to the embodiment, the occupant side wall portion 16 can be widely deployed vertically in the initial stage of inflation, and even if the approaching occupant moves forward, the occupant is widely deployed vertically. By the side wall part 16, it can protect exactly.

It is a schematic longitudinal cross-sectional view which shows the vehicle mounting state of the airbag apparatus for passenger seats where the airbag for passenger seats which is one Embodiment of this invention was used. It is the perspective view seen from the vehicles front side of the state where the air bag of an embodiment was inflated alone. It is sectional drawing of the vehicle front-back direction of the state which expanded the airbag of embodiment alone. It is a top view which shows the member which comprises the airbag of embodiment. It is a figure which shows the manufacturing process of the airbag of embodiment. It is a perspective view which shows the fold at the time of carrying out preliminary folding of the airbag of embodiment. FIG. 2 is a view of the airbag according to the embodiment after being pre-folded and viewed from the gas inlet side. FIG. 2 is a view of the airbag according to the embodiment after being pre-folded and viewed from the side of the occupant side wall. It is an end view of the IX-IX part of FIG. It is an end view of the XX site | part of FIG. It is an end view of the XI-XI site | part of FIG. It is a figure which shows the folding process after the preliminary folding of the airbag of embodiment. It is a figure which shows the folding process of the airbag of embodiment, and shows the process after FIG. It is a figure explaining the use condition of the air bag of an embodiment, and shows the state which looked at the expansion and inflation of an air bag from the side of vehicles. It is a figure of the state which looked at the expansion | swelling expansion | deployment of the airbag of embodiment from the side of a vehicle, and shows the state after FIG.

Explanation of symbols

1 ... Instrument panel (instrument panel),
2… Top surface,
14 ... Airbag for passenger seat,
15 ... Airbag body,
16 ... occupant side wall,
18 ... peripheral wall,
19 ... Lower side wall,
21 ... Gas inlet,
36 ... Rectifying cloth,
36a ... rear end,
37 (37A, 37B) ... opening,
46 ... Pre-folded airbag,
47 ... upper edge side part,
48 ... rear edge side part,
50 ... rear part,
54 ... Roll folding part,
CH ... fold,
G (GF · GB) ... expansion gas,
M ... Airbag device for passenger seat.

Claims (1)

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 It is configured to expand and expand to the rear side of the vehicle so as to close it,
As a shape at the time of completion of expansion and expansion, a shape including an occupant side wall portion arranged along a substantially vertical direction on the occupant side, and a peripheral wall portion narrowed in a substantially conical shape from the outer peripheral edge of the occupant side wall portion to the vehicle front side. And an airbag body configured by disposing a gas inflow port as an opening surface along a substantially horizontal direction on the front side on the lower side of the peripheral wall portion at the time of completion of deployment,
In the airbag main body, a substantially cylindrical shape that is disposed so as to cover the upper side of the gas inlet and opens both ends in the front-rear direction so as to rectify the inflation gas flowing in from the gas inlet. Rectifying cloth
And is configured to include
After pre-folding, it is configured to be folded and stored by performing horizontal folding to fold along the left-right direction and vertical folding to fold along the front-rear direction,
The pre-folding shape at the time of pre-folding is
Folding the peripheral wall part, in a state where substantially the entire area of the occupant side wall part is flattened, and is shaped to overlap and flatten from the upper side to the lower side of the peripheral wall part,
The vicinity part of the connection part with the upper edge of the occupant side wall part in the peripheral wall part is folded with a valley fold along the left-right direction,
The passenger seat airbag has a shape that is located on the rear side from the rear edge of the gas inlet,
The rectifying cloth is
When the airbag is deployed and inflated, in the airbag body, at least the upper side of the front and rear ends is disposed so as to protrude above the upper surface of the instrument panel, and
When the preliminary folding is completed, the rear end is disposed so as to be positioned on the front side in the vicinity of the fold,
When the airbag is folded sideways after completion of preliminary folding, the portion of the preliminary folded airbag that is on the rear side of the gas inlet is aligned in the left-right direction so that the rear end side approaches the gas inlet. An airbag for a passenger seat, wherein the airbag is folded by a roll fold that is folded and wound around the peripheral wall.

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