JP5206707B2 - Airbag device for passenger seat - Google Patents

Description

  In the present invention, the airbag is folded and stored in a case arranged on the upper surface side of the instrument panel in front of the passenger seat, and protrudes from the case when the inflating gas flows in, and is rearward from the upper surface side of the instrument panel. The present invention relates to an airbag device for a passenger seat that is configured to be deployed and expanded.

  In the conventional airbag device for a passenger seat, there has been a configuration in which an inflated airbag can receive an occupant without the front surface being supported by a windshield (for example, Patent Document 1). reference). In the airbag of this airbag apparatus, a support inflating portion that is brought into contact with the upper surface of the front side of the case in the instrument panel is arranged at the front end portion when the inflation is completed. In this airbag, when the inflating is completed, the occupant moving forward hits the rear surface of the airbag, and even if the rear portion of the airbag moves upward with the attachment portion to the case as the center of rotation, the support inflating portion is mounted on the instrument panel. In this case, the upward movement of the rear portion of the airbag is suppressed. In other words, in this airbag device, since the upward movement of the rear side of the airbag can be suppressed only by providing the support inflating portion without supporting the front side of the windshield, the front side is made to be supported by the windshield. The volume of the airbag can be reduced by omitting the volume to be inflated.

  In addition, there are other passenger airbag devices that suppress the upward movement of the rear side of the airbag without adjusting the inner pressure of the airbag and supporting the airbag by the windshield (for example, Patent Document 2). reference).

JP 2007-308088 A JP 2009-173165 A

  However, in the airbag device described in the conventional Patent Document 1, the airbag is formed as a single plate so that the front wall of the support inflatable portion can be formed into a triangular pyramid shape that is difficult to compress and deform when inflated. And it has comprised so that the upper end of a front wall may be arrange | positioned in the immediate vicinity of the axial center of a case. That is, in the airbag apparatus described above, the front wall of the airbag and the axial center of the case are made to correspond to each other, and of course, the front wall of the airbag itself is deployed and inflated from the state of being stored on the upper surface side of the instrument panel. However, it was necessary to set so as not to touch the windshield. Therefore, if the vehicle type on which the airbag device is mounted is changed, and the inclination angle on the upper surface side of the instrument panel on which the airbag device is arranged is changed, not only the setting of the shape of the airbag with respect to the windshield, It was necessary to set the shape and mounting state of the case, including the axis of the case that houses the airbag, and it was not possible to cope with it easily.

  Similarly, even in the airbag device of Patent Document 2, the shape of the airbag is set so that it does not come into contact with the windshield even when deployed and inflated from the state of being accommodated on the upper surface side of the instrument panel. It is necessary to set the output of the inflator that supplies the inflation gas in accordance with the volume of the airbag so that a predetermined internal pressure can be secured without limiting to the setting of the airbag alone. For this reason, even with this airbag device, when the mounted vehicle type is changed, it cannot be dealt with simply by setting the airbag, and cannot be dealt with simply.

  SUMMARY OF THE INVENTION The present invention solves the above-described problem, and provides a passenger seat airbag device that can easily cope with the change of the mounted vehicle type and suppress the upward movement of the rear side of the airbag when inflation is completed. The purpose is to provide.

In the passenger seat airbag device according to the present invention, the airbag is
Attached to the case placed on the upper surface side of the instrument panel in front of the passenger seat, folded and stored,
When inflating gas flows in, it protrudes from the case, and is configured to expand and expand backward from the upper surface side of the instrument panel below the windshield.
An airbag device for a passenger's seat having a configuration in which a support inflating portion that is brought into contact with the upper surface of the front side of the case in the instrument panel is disposed at the front end portion at the time of completion of inflation to suppress upward movement of the rear side of the airbag. Because
The airbag includes a bag body that constitutes the outer peripheral wall, and a rectifying cloth that is disposed in the bag body and controls the flow of the inflation gas flowing into the bag body.
The bag body is disposed at the rear end when the inflation is completed, and includes a restraint wall portion that catches an occupant, and a tubular wall portion that closes the front end and extends forward from the outer peripheral edge of the restraint wall portion in a tubular shape,
The cylindrical wall portion has an inflow opening for allowing the inflating gas to flow into the lower surface on the front end side when the expansion is completed, and the periphery of the inflow opening is used as an attachment site to be attached to the case. , Arranged on the front end side of the front side of the inflow opening,
The inflow opening has an outflow opening and covers the upper side of the inflow opening so that the rectifying cloth flows the inflation gas flowing in from the inflow opening in a plurality of directions including the front side. Attached to the periphery of the
When the inflation of the airbag is completed, the rectifying cloth is configured to be able to contact the entire periphery of the front-side outflow opening that extends from the lower surface side of the cylindrical wall portion to the upper surface side through the left and right side surfaces in the support inflating portion. It is characterized by being.

  In the passenger seat airbag device according to the present invention, if the inflation gas flows into the bag body from the inflow opening, the bag body is moved to the case by the inflation gas that flows out from the plurality of outflow openings of the rectifying cloth. While expanding from the upper surface side of the instrument panel below the windshield. Then, in the airbag that has been inflated, the periphery of the outflow opening on the front side of the rectifying cloth is provided on the entire periphery where the support inflating portion of the bag body extends from the lower surface side of the cylindrical wall portion to the upper surface side through the left and right side surfaces. The inner pressure of the support inflatable part is equivalent to the inside of the rectifying cloth, and the inner pressure is increased from the portion of the bag body other than the supporting inflating part on the outer peripheral side of the rectifying cloth, like the inner bag together with the rectifying cloth. Swells and is strongly pressed against the upper surface of the instrument panel in front of the case. Note that in the rectifying cloth, even if the airbag is in an inflated state, the inflating gas flows from the inflow opening. Therefore, as long as the inflating gas continues to flow, the inflation gas flows from the rectifying cloth portion. The internal pressure can be maintained higher than the downstream portion of the bag body.

  Of course, the part of the bag body other than the support inflating part is smoothly inflated by the inflating gas flowing out from the outflow opening other than the front outflowing opening in the rectifying cloth, and exerts tension on the peripheral wall. It will have a certain degree of shape retention.

  After that, when the inflated airbag receives the occupant moving forward by the restraint wall, the cylindrical wall rotates so that the rear side moves upward with the attachment part to the case as the center of rotation. try to. However, in this airbag, the support inflating part on the front end side is in pressure contact with the upper surface side of the instrument panel in front of the case as an internal pressure higher than other parts, as in the flow rectifying cloth. The peripheral wall of the airbag does not shrink, and a large reaction force from the instrument panel can be received, and the rotation for moving the rear side of the airbag upward can be reliably regulated.

  In the airbag of the airbag device according to the present invention, since the outflow opening on the front side of the rectifying cloth is not fixed to the inner peripheral surface of the support inflating part itself, the support inflating part is inflated. Before completion, or when the internal pressure of the support expansion part after completion of expansion is too high, the expansion gas in the support expansion part flows into the opening peripheral edge on the front side of the flow straightening cloth and the inner peripheral surface of the support expansion part. Leaked from between, flows along the inner peripheral surface of the cylindrical wall portion on the outer surface side of the rectifying cloth, flows to the rear side of the cylindrical wall portion, and smoothly promotes or supports the inflation of the airbag A sudden increase in internal pressure of the expanding portion can be prevented.

  In the airbag device according to the present invention, even if the mounted vehicle type is changed, the shape of the bag body including the support inflating portion for the windshield and the instrument panel and the inner peripheral surface of the supporting inflating portion are in contact. Since it can be performed by setting the shape of the peripheral edge of the front outflow opening and the airbag itself, it is possible to easily cope with the suppression of the upward movement of the airbag.

  Therefore, in the passenger seat airbag device according to the present invention, even if the mounted vehicle type is changed, it is possible to easily cope with the upward movement of the rear side of the airbag when the inflation is completed.

  Further, in the airbag of the passenger seat airbag device according to the present invention, it is not necessary to support the upper surface side of the cylindrical wall portion by the windshield, so the volume on the front side to be brought into contact with the windshield is omitted. Can be configured as a small volume.

  In the passenger seat airbag device according to the present invention, the length of the peripheral edge of the front outflow opening in the rectifying cloth is longer than the length of the inner peripheral surface of the support inflating portion of the portion in contact with the front outflow opening peripheral edge. It is desirable to make it long. In such a configuration, when the airbag is inflated, the peripheral edge of the front outflow opening in the rectifying cloth is surely in contact with the inner peripheral surface of the support inflating portion, so that the inflation gas in the rectifying cloth is supported and inflated. It can be made to store in a part, and the internal pressure of a support expansion part can be raised like the inside of a baffle cloth stably.

  In the passenger airbag device according to the present invention, the rectifying cloth includes a front outflow opening and a rear outflow opening so that the inflation gas flowing in from the inflow opening flows in two directions on the front and rear sides. It is desirable to provide a cylindrical shape extending in the front-rear direction, and to narrow the rear outflow opening from the opening area of the intermediate part in the front-rear direction when the airbag is completely inflated.

  In such a configuration, when the inflation gas that has flowed into the flow rectifying cloth from the inflow opening of the bag body flows out from the rear outflow opening, it flows out through the throttled rear outflow opening. This will increase the internal pressure accurately. Therefore, the support expansion part which has contacted the periphery of the opening for front side outflow to the inner peripheral surface can raise the internal pressure smoothly and press-contact with the upper surface of the instrument panel similarly to the inside of the rectifying cloth. Further, in such a configuration, since the inflation gas flowing out from the rear outflow opening flows backward into the bag body along the upper surface of the instrument panel behind the case, the bag body is instrumented. It can be restrained from expanding and inflating along the upper surface of the panel and partially protruding to the occupant side.

  Further, in this case, when the airbag is completely inflated, the direction of the opening surface of the front outflow opening is substantially orthogonal to the direction of the opening surface of the rear outflow opening so that the opening surface of the rear outflow opening is opened. It is desirable to arrange so that the direction of is obliquely downward and downward. In such a configuration, the direction of the expansion gas flowing out from the front outflow opening and the rear outflow opening of the rectifying cloth intersects so as to be orthogonal to each other, and the expansion gas flowing out from the rear outflow opening The direction is configured to be reversed with the direction of the expansion gas flowing into the rectifying cloth from the inflow opening, and the expansion gas about to flow out from the rear outflow opening has a flow resistance in the rectifying cloth. In the receiving state, it is possible to easily increase the internal pressure in the rectifying cloth, and the support inflating part in which the peripheral edge of the front-side outflow opening is in contact with the inner peripheral surface is smoother as in the rectifying cloth. The internal pressure can be increased, and the upper surface of the instrument panel can be pressed. Further, since the inflation gas flowing out from the rear outflow opening flows out into the bag main body from the upper surface of the instrument panel at the rear of the case toward the rear lower side so as to follow the rear surface, the bag main body It is possible to prevent the instrument panel from expanding and expanding along the rear surface from the upper surface of the instrument panel and partially projecting further toward the passenger.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal cross-sectional view in the front-rear direction of a passenger seat airbag device mounted in a vehicle according to an embodiment of the present invention. It is the perspective view seen from the back side of the state where the airbag used for the passenger's seat airbag device of an embodiment was inflated alone. It is a longitudinal cross-sectional view along the front-back direction of the state which expanded the airbag used for embodiment alone, and respond | corresponds to the III-III site | part of FIG. FIG. 4 is a schematic end view along the left-right direction in the vicinity of the front outlet of the rectifying cloth in a state where the airbag of the embodiment is inflated alone, and corresponds to the IV-IV part in FIG. 3. It is the schematic cross-sectional view seen from the upper direction of the baffle cloth in the state which expanded the airbag of the embodiment single-piece | unit, 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 top view which shows the side surface panel which comprises the airbag of embodiment. It is a top view which shows the middle of manufacture of the airbag of an embodiment. It is the figure seen from the side of the vehicle which shows the time of the action | operation of the airbag apparatus for passenger seats of embodiment. It is the figure seen from the back of vehicles which shows the time of operation of the air bag device for front passenger seats of an embodiment. It is the figure seen from the side of the vehicle which shows the state which received the passenger | crew's head at the time of the action | operation of the airbag apparatus for passenger seats of embodiment. It is the enlarged view seen from the side of vehicles showing the time of operation of the air bag device for a passenger seat of an embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A passenger seat airbag apparatus (hereinafter simply referred to as an airbag apparatus) M according to an embodiment includes an instrument panel ( Hereinafter, it is a top mount type disposed near the rear surface 3 on the upper surface 2 side of 1. Since the airbag device M is disposed in the vicinity of the bent corner portion 4 between the upper surface 2 and the rear surface 3 on the upper surface 2 side of the instrument panel 1, it is approximated to the mid-mount type disposed on the rear surface 3 side. It can also be said to be a semi-top mount type. The airbag apparatus M includes a folded airbag 20, an inflator 10 that supplies inflation gas to the airbag 20, a case 6 that stores and holds the airbag 20 and the inflator 10, and the airbag 20 as a case. 6, a retainer 14 for attaching to the airbag 6 and an airbag cover 12 covering the folded airbag 20.

  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 12 is formed integrally with the instrument panel 1 made of synthetic resin, and is configured such that when the airbag 20 is deployed and inflated, the front and rear door portions 12a and 12b are pushed by the airbag 20 and opened. ing. A connecting wall portion 12 d that is connected to the case 6 is formed around the door portions 12 a and 12 b of the airbag cover 12. In addition, each door part 12a, 12b will be pushed open by the airbag 20 which expand | swells centering on the hinge part 12c which consists of integral hinges.

  The inflator 10 includes a substantially cylindrical main body portion 10 a having a plurality of gas discharge ports 10 b and a flange portion 10 c for attaching the inflator 10 to the case 6.

  The case 6 is formed in a substantially rectangular parallelepiped shape made of sheet metal having a rectangular opening on the upper end side, a substantially rectangular plate-shaped bottom wall portion 7 to which the inflator 10 is inserted from below and attached to the outside of the bottom wall portion 7. The peripheral wall portion 8 extends upward from the peripheral edge and is connected to the connecting wall portion 12 d of the airbag cover 12. In the case 6, a bracket (not shown) connected to the body side of the vehicle is disposed at the bottom wall portion 7. The peripheral wall portion 8 includes a front wall 8a and a rear wall 8b that are disposed so as to face each other in the front-rear direction, and includes a side wall 8c that faces the left and right sides. The front wall 8a and the rear wall 8b are engaged with the connecting wall portion 12d of the airbag cover 12, and the connecting wall portion 12d is integrally connected to the front wall 8a and the rear wall 8b to fold the air. A plurality of locking hooks 8d are formed for exhibiting the same functions as the front wall 8a and the rear wall 8b of the case 6 that stores the bag 20.

  Note that the airbag 20 and the inflator 10 are formed by attaching a plurality of (four in the embodiment) bolts 14 a of the square annular retainer 14 disposed in the airbag 20 to a mounting portion 26 described later of the airbag 20. The nut 27 passes through the hole 27, the bottom wall portion 7 of the case 6, and the flange portion 10 c of the inflator 10, and is attached to the case 6 by being fastened with a nut 15.

  As shown in FIGS. 1 to 5, the airbag 20 controls the flow of the bag body 21 that forms the outer peripheral wall 22 and the inflation gas G that is disposed in the bag body 21 and flows into the bag body 21. And a rectifying cloth 41 to be configured.

  The bag body 21 is disposed at the rear end at the time of completion of the inflation as a forwardly inclined state in which the upper edge 23a side is positioned forward of the lower edge 23b side, and the head PH (see FIGS. 9 to 11) of the occupant P is placed. The restraint wall portion 23 to be received and the cylindrical wall portion 24 that closes the front end 24e and extends forward from the outer peripheral edge of the restraint wall portion 23 into a tapered, substantially quadrangular pyramid-like tubular shape. .

  The cylindrical wall portion 24 has an inflow opening 25 that is opened in a circular shape for allowing the expansion gas G to flow into the lower surface 24b on the front end 24e side when the expansion is completed, and the periphery of the inflow opening 25 is The retainer 14 is used as an attachment portion 26 that is attached to the bottom wall portion 7 of the case 6. Therefore, the attachment part 26 is disposed in the same shape as the planar shape of the retainer 14, and an attachment hole 27 through which each bolt 14 a of the retainer 14 is inserted is passed through the attachment part 26. A vent hole 39 having a circular opening is disposed on the left side surface 24c and the right side surface 24d of the cylindrical wall portion 24.

  The flow regulating cloth 41 has a substantially cylindrical shape extending in the front-rear direction, and has a plurality of outflow openings so that the inflation gas G flowing into the bag body 21 from the inflow opening 25 flows in a plurality of directions including the front side. (In the case of the embodiment, it has a front-side outflow opening 42 and a rear-side outflow opening 44 so as to flow on both the front and rear sides) and covers the upper side of the inflow opening 25. It is attached to the attachment part 26 at the periphery of the opening 25.

  In the case of the embodiment, when the inflation of the airbag 20 is completed in a vehicle-mounted state and the rectifying cloth 41 is inflated by inflating the inflation gas G from the inflow opening 25, as shown in FIG. In the part away from the upper surface 2 of the instrument panel 1, the rectifying cloth 41 has a shape that is narrowed so that the opening area BA of the rear outlet opening 44 is narrower than the opening area MA of the intermediate part 41c in the front-rear direction. Yes. In this state, the front outflow opening 42 and the rear outflow opening 44 have substantially the same opening areas FA and BA. Further, the front outflow opening 42 has a substantially elliptical shape extending in the front-rear direction with the opening surface 42a facing the oblique front lower direction FD, and the rear outflow opening 44 has the opening surface 44a obliquely rearward downward. It is made into the substantially ellipse extended in the front-back direction toward BD. When the airbag 20 is completely inflated, the direction FD of the opening surface 42a of the front outflow opening 42 and the direction BD of the opening surface 44a of the rear outflow opening 44 are substantially orthogonal.

  Furthermore, the flow straightening cloth 41 has gas outlets 46 and 46 on both the left and right sides of the front portion 41a for preventing the right and left fluctuations of the flow straightening cloth 41 by utilizing the reaction force when the expansion gas G flows out. It is arranged. These gas outlets 46 are circular openings smaller than the front-side outflow opening 42 and the rear-side outflow opening 44.

  Further, in this rectifying cloth 41, when the inflation of the airbag 20 is completed, the peripheral edge 43 of the front outflow opening 42 is an upper surface through the left side surface 24c and the right side surface 24d from the lower surface 24b side on the front end 24e side of the cylindrical wall portion 24. It is set so as to contact the entire circumference applied to the 24a side. In particular, in the case of the embodiment, as shown in FIG. 4, the length dimension OL of the peripheral edge 43 of the front outflow opening 42 is set to the front side so that the peripheral edge 43 of the front outflow opening 42 stably contacts. The length of the inner peripheral surface 36 of the portion (supporting inflating portion) 35 of the bag main body 21 that the peripheral edge 43 of the outflow opening 42 contacts is longer by about 1 to 30% (20% in the embodiment). Is set.

  The portion of the bag body 21 that contacts the peripheral edge 43 of the front outflow opening 42 is located behind the support inflating portion 35 that is in pressure contact with the upper surface (front upper surface) 2a of the instrument panel 1 in front of the case 6 when the airbag 20 is completely inflated. The inner peripheral surface 36 of the edge 35a is used.

  The rectifying cloth 41 is composed of two rectifying cloth materials 70 (70L, 70R) as shown in FIGS. These rectifying fabric materials 70 are formed by weaving synthetic fibers such as polyamide and polyester by plain weaving or the like, similarly to the side panel 50 (50L, 50R) and the rear panel 65 constituting the bag body 21. It is formed from woven fabric. Then, the two rectifying cloth materials 70 (70L, 70R) are overlapped on the inner periphery of the bag body 21 so as to be bilaterally symmetrical, and together with the bag body 21, the inflow opening 25 and the attachment hole 27 are formed. A disc-shaped opening forming part 72 formed with the mounting part 26 provided, a front edge 71 and a rear edge 73 extending from the front and rear of the opening forming part 72, and an upper edge connecting the front edge 71 and the rear edge 73 to each other 74. When the bag body 21 is manufactured, the rectifying cloth 41 has the opening forming parts 54 and 54 in which the opening forming parts 72 and 72 of the left and right rectifying cloth materials 70L and 70R are overlapped with each other on the side panels 50L and 50R. Further, after being further overlapped, they are joined to the opening forming portion 54 of the side panels 50L and 50R by sewing. Thereafter, the inflow opening 25 and the mounting hole 27 are provided together with the opening forming portions 54 and 54 by drilling, and then the upper edges 74 and 74 are sewn together. Further, the peripheral edge 43 of the front-side outflow opening 42 of the flow regulating cloth 41 is constituted by a portion 71a in which the front edges 71 of the flow regulating cloth materials 70L and 70R do not overlap with each other and do not become a seam allowance. The peripheral edge 45 of the rear outflow opening 44 includes a portion 73a where the rear edges 73 of the flow regulating cloth materials 70L and 70R do not overlap with each other and do not become a seam allowance.

  On the other hand, as shown in FIGS. 2 and 3, the bag body 21 has an outer peripheral wall 22 with respect to the two side panels 50 (50 </ b> L, 50 </ b> R) and the rear edge 50 e of the two side panels 50. The left and right edges 65c and 65d are coupled to each other to form a constraining wall portion 23 and a rear panel 65. The two side panels 50L and 50R form most of the cylindrical wall portion 24 of the bag body 21, and are formed symmetrically with respect to each other so that the cylindrical wall portion 24 is divided into left and right parts. Has been.

  As shown in FIGS. 6 to 8, the two side surface panels 50L and 50R include an upper edge 50f extending from the front end 50a to the upper end 50c disposed at the front end 24e of the cylindrical wall portion 24, and a front end 50a to the rear end 50b. As a substantially triangular plate shape having a lower edge 50d extending to the upper end and a rear edge 50e connecting the upper end 50c and the rear end 50b, the side panels 50L and 50R are sewn to the upper edge 50f and the lower edge 50d by sewing. An upper edge side binding site 51 and a lower edge side binding site 52 to be bonded are disposed.

  The lower edge side binding portion 52 is configured by disposing a front binding portion 53, an opening forming portion 54, and a rear binding portion 55 in order from the front side.

  As shown in FIG. 7, the front coupling portion 53 has a front end of the cylindrical wall portion 24 along a front center line CLF extending forward from the center of the inflow opening 25 on the lower surface 24 b of the cylindrical wall portion 24. From 24e, it is arrange | positioned so that it may extend linearly from the front edge of the inflow opening 25 (front edge of the attachment part 26 pressed by the retainer 14) 26a vicinity. The front coupling portion 53 has a height dimension HF from the bottom wall portion 7 of the case 6 to which the airbag 20 is attached to the upper surface (front upper surface) 2a side of the instrument panel 1 in front of the case 6 (see FIG. 1). ), The length dimension FL is long in the front-rear direction (see FIG. 7). Therefore, when the airbag 20 is completely inflated by a length longer than the height dimension HF of the length dimension FL, it is pressed against the front upper surface 2a of the instrument panel 1 in front of the case 6 on the front end 24e side of the cylindrical wall portion 24. The substantially triangular pyramidal support expansion portion 35 is formed (see FIG. 9).

  Note that the front side of the inflow opening 25 on the lower surface 24b side of the cylindrical wall portion 24 of the airbag 20 at the time of completion of the inflation is formed by the coupling between the front coupling portions 53 of the two side panels 50L and 50R. 6 is formed on the front wall 8a and the connecting wall portion 12d of the front panel 6 or the front upper surface 2a of the instrument panel 1 on the front side of the case 6 (see FIG. 12). Specifically, the front support surface 29 includes a front-side instrument panel abutting portion 29a that receives a reaction force from the front-side upper surface 2a side of the instrument panel 1 including the back surface 12aa of the opened door portion 12a, and the front wall of the case 6 8a and a rear-side front wall abutting portion 29b that receives a reaction force from the connecting wall portion 12d, and the front instrument panel abutting portion 29a constitutes the lower surface side of the support expansion portion 35.

  As shown in FIGS. 7 and 8, the opening forming portion 54 is sewn together in a substantially annular shape together with the rectifying cloth materials 70 </ b> L and 70 </ b> R so as to concentrically surround the inflow opening 25. , 54c are provided. These stitched portions 54a, 54b and 54c are formed by opening the upper edge 50f side of the side panels 50L and 50R where the front coupling part 53 and the rear coupling part 55 are sewn, and opening the part 54 into the opening forming part 54. The current forming cloth materials 70L and 70R are formed by overlapping and sewing the opening forming portions 72. Further, a part of the stitched portions 54b and 54c has a lower edge 50d of the side panel 50 provided with a notch 50g near the rear edge 26b of the peripheral edge of the inflow opening 25, and the side panels 50L and 50R. They are not stitched together.

  In the airbag 20, the opening portions 72 of the two rectifying cloth materials 70 </ b> L and 70 </ b> R are overlapped on the opening portions 54 of the side panels 50 </ b> L and 50 </ b> R, and stitched portions 54 a, 54 b and 54 c are provided. After the sewing, the inflow opening 25 and the attachment hole 27 are provided in the opening forming portions 54, 54, 72, 72 by drilling.

  The rear coupling portion 55 extends from the rear edge 26b of the inflow opening 25 in the cylindrical wall portion 24 along a rear center line CLB extending rearward from the center of the inflow opening 25 in the lower surface 24b of the cylindrical wall portion 24. It is disposed so as to extend substantially linearly up to the vicinity of the rear end 50b. Further, the rear coupling portion 55 has a height dimension HB from the bottom wall portion 7 of the case 6 to which the airbag 20 is attached to the upper surface (rear upper surface 2b) side of the instrument panel 1 behind the case 6 (FIG. 1). As shown in FIG. 7, a V-groove portion 57 is formed in the vicinity of the rear edge 26b of the inflow opening 25 inwardly from the rear center line CLB to the inner side on the upper end 50c side. Has been.

  Specifically, as shown in FIG. 7, a front straight portion 56 and a rear straight portion 58 along the rear center line CLB are disposed before and after the V groove portion 57, and the front straight portion 56 has an inflow opening. 25 is arranged so as to extend rearward from a slit 50h extending from a notch 50g near the rear edge 26b to a portion of the rear center line CLB.

  The V groove portion 57 includes a front inclined portion 57a extending inward from the rear end of the front straight portion 56, and a rear inclined portion 57b extending from the front end of the rear straight portion 58 to the inner upper end 50c side. A top 57c that is recessed most inward is provided therebetween. The length dimension VL in the front-rear direction from the rear edge of the inflow opening 25 in the rear coupling part 55 (the rear edge of the attachment part 26 pressed by the retainer 14) 26a to the most concave top part 57c of the V-groove part 57 is The height dimension HB from the bottom wall portion 7 of the case 6 to which the bag 20 is attached to the upper surface (rear upper surface 2b) side of the instrument panel 1 behind the case 6 is set to be equal. Specifically, the length dimension VL in the front-rear direction is a height dimension from the bottom wall 7 of the case 6 to the rear upper surface 2b side of the instrument panel 1 including the thickness of the opened rear door 12b. When the airbag 20 of the embodiment is set to be slightly larger than HB and the inflation of the airbag 20 is completed, the top 57c of the V-groove 57 is an open rear side door on the rear upper surface 2b side of the instrument panel 1 near the case 6. In other words, the rear wall 8b of the case 6 and the rear of the instrument panel 1 are arranged so as to be disposed above the rear surface 12ba of the portion 12b, in other words, above the hinge portion 12c on the rear surface 12ba side of the door portion 12b. It is set so as to be arranged at the intersection (front end of the rear upper surface 2b of the instrument panel 1) 2c with the side upper surface 2b (see FIG. 12).

  In the case of the embodiment, the amount of depression d0 from the rear center line CLB of the top portion 57c of the V groove portion 57 is 60 mm, and the front inclined portion 57a and the rear inclined portion 57b disposed before and after the top portion 57c in the V groove portion 57. Is set to 105 ° (see FIG. 7).

  Furthermore, in the case of the embodiment, the top portion 57c of the V-groove portion 57 is disposed in front of the front-rear direction center of the rear coupling portion 55, and is closer to the front side than the front-rear direction center of the V-groove portion 57 itself. They are arranged in a biased manner.

  Further, the two rear side panels 50L and 50R are connected to the rear side of the inflow opening 25 on the lower surface 24b side of the cylindrical wall portion 24 of the airbag 20 by the coupling between the rear coupling portions 55 of the side panels 50L and 50R. A rear support surface 30 that comes into contact with the rear wall 8b of the case 6 including the wall portion 12d or the rear upper surface 2b on the rear side of the case 6 is formed (see FIG. 12). Specifically, the rear support surface 30 includes a front-side rear wall abutting portion 31 that receives a reaction force from the rear wall 8b of the case 6 including the connecting wall portion 12d, and a back surface 12ba of the opened door portion 12b. The rear instrument panel 1 includes a rear instrument panel abutting portion 33 that receives a reaction force from the rear upper surface 2 b side of the instrument panel 1. Between the rear wall contact portion 31 and the rear instrument panel contact portion 33, a bent portion 32 provided with a top portion 57c of the V-groove portion 57 of the side panels 50L and 50R is disposed.

  The upper edge side coupling portions 51 of the two side panels 50L and 50R are sewn together to form the upper surface 24a side of the cylindrical wall portion 24. In the embodiment, from the front end 50a to the upper end 50c, It is formed in a straight line. Furthermore, the upper edge side binding portion 51 is connected to the front binding portion 53 of the lower edge side binding portion 52 so that the upper surface 24a of the cylindrical wall portion 24 does not come into contact with the windshield 5 when the inflation is completed or the occupant head PH is restrained. The opening angle θ is set. In the case of the embodiment, the opening angle θ is about 65 °.

  The rear edge side coupling portions 60 of the two side surface panels 50L and 50R are formed so as to swell rearward so as to be sewn to the left edge 65c and the right edge 65d of the rear surface panel 65, respectively. . Further, the trailing edge side binding site 60 is formed by overlapping the two side surface panels 50L and 50R and opening the trailing edge side binding sites 60 by a broken line Y (see FIG. 7) connecting the upper end 50c and the rear end 50b. The shape is matched with the planar shape of the rear panel 65. Therefore, the rear surface side panel 65 is configured so that it can be easily laid on the rear edge side connecting portions 60 and 60 of the two side surface side panels 50L and 50R opened at the fold line Y, and can be easily sewn on a plane. Yes.

  The rear surface side panel 65 constitutes the constraining wall portion 23 and the lower surface 24d side of the rear end 24f of the cylindrical wall portion 24, and has an elliptical plate shape in which long axes are arranged in the vertical direction. Then, the rear panel 65 has a coupling portion 66 (66L, 66R) between the left edge 65c and the right edge 65d corresponding to the trailing edge coupling portion 60 of the two side panels 50L, 50R, and is on the upper end 65a side. From the inflection point 68 beyond the intermediate part in the vertical direction to the inflection point 68 exceeding the intermediate part in the vertical direction, the bulging curve portion 67 of the curved shape of the outer bulge is approached from the inflection point 68 beyond the vertical intermediate part to the lower end 65b. A straight linear portion 69 is formed and configured. The corresponding side edge side panels 50L, 50R also have a bulging curve portion 61 that bulges outward from the upper end 50c side to the inflection point 62 corresponding to the bulging curve portion 67. In correspondence with the straight line portion 69, a straight straight line portion 63 is disposed from the inflection point 62 to the rear end 50b.

  In the case of the embodiment, when the airbag 20 is completely inflated with the vehicle mounted, as shown in FIGS. 9 and 10, the left edge 65c and the right edge 65d of the rear panel 65 are expanded outwardly. The upper area 65 e that is the curved portion 67 constitutes the constraining wall portion 23. On the other hand, the lower area 65f, in which the left edge 65c and the right edge 65d of the rear panel 65 are straight linear portions 69, is located below the restraint wall portion 23 so as to move diagonally downward and forward from the vicinity of the chest PB of the occupant P. It extends diagonally forward and downward from the edge 23b and constitutes the lower surface 24b side of the rear end 24f of the cylindrical wall portion 24.

  In the airbag 20, the front binding sites 53 and the rear binding sites 55 in the lower edge side binding sites 52 of the two side panels 50L and 50R are joined together by stitching, and then the side panels 50L and 50R are joined. The opening forming portions 72 and 72 are overlapped with the opening forming portions 54 and 54, and the stitched portions 54a, 54b, and 54c are formed by sewing to form the inflow opening 25 and the attachment hole 27 (see FIG. 7). Next, the upper edge side binding sites 51 of the two side panels 50L and 50R are sewn and joined together, and further folded along the fold line Y to form the rear edge side binding sites 60 and 60 and the binding site 66 of the rear side panel 65. Are joined together. Thereafter, the stitched airbag 20 is turned upside down using the inflow opening 25 so that the seam allowance does not appear on the outer surface side of the airbag 20, and the flow regulating fabric materials 70 </ b> L and 70 </ b> R are turned from the inflow opening 25. When the upper edge 74 is pulled out and the upper edges 74 are stitched together to form the flow straightening cloth 41, the stitched upper edge 74 is stored in the airbag 20 through the inflow opening 25. 20 can be manufactured.

  Thereafter, the airbag 14 is folded with the retainer 14 disposed therein so that the bolts 14a protrude from the respective mounting holes 27, and further, the folded airbag 20 is surrounded around the folded airbag 20 so as not to collapse. Wrapping with a wrapping sheet (not shown) that can be broken. Then, the folded airbag 20 is placed on the bottom wall 7 of the case 6 so that each bolt 14 a protrudes from the bottom wall 7 of the case 6. Next, the main body portion 10 a of the inflator 10 is inserted into the case 6 from below the bottom wall portion 7, and each bolt 14 a protruding downward from the bottom wall portion 7 is inserted into the flange portion 10 c of the inflator 10. Then, if the nut 15 is fastened to each bolt 14a protruding from the flange portion 10c of the inflator 10, the folded airbag 20 and the inflator 10 can be attached to the bottom wall portion 7 of the case 6.

  Then, the peripheral wall portion 8 of the case 6 is locked to the connecting wall portion 12d of the airbag cover 12 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 airbag device M for the passenger seat according to the embodiment can be mounted on the vehicle.

  If the inflation gas is discharged from each gas discharge port 10b of the inflator 10 at the time of frontal collision of the vehicle after the airbag device M is mounted on the vehicle, the airbag 20 expands and breaks a wrapping sheet (not shown). At the same time, the door portions 12a and 12b of the airbag cover 12 are pushed and opened as shown in FIGS. The airbag 20 protrudes upward from an opening formed by opening the door portions 12a and 12b of the airbag cover 12, and expands and inflates from the upper surface 2 side of the instrument panel 1 to the rear side beyond the rear surface 3. Thus, the expansion is completed. In other words, in the airbag apparatus M of the embodiment, if the inflation gas G from each gas discharge port 10b of the inflator 10 flows into the bag main body 21 from the inflow opening 25, a plurality of outflows of the rectifying cloth 41 are performed. The bag body 21 pushes and opens the doors 12a and 12b from the case 6 by the inflation gas G (GF, GB) flowing out from the openings (in the embodiment, the front outflow opening 42 and the rear outflow opening 44). It projects and expands rearward from the upper surface 2 side of the instrument panel 1 below the windshield 5.

  Then, in the airbag 20 that has been inflated, the support inflating portion 35 of the bag body 21 extends from the lower surface 24b side of the cylindrical wall portion 24 to the upper surface 24a side through the left side surface 24c and the right side surface 24d. The peripheral edge 43 of the front-side outflow opening 42 of the rectifying cloth 41 is brought into contact, the internal pressure of the support inflating part 35 is made equal to that in the rectifying cloth 41, and the bag body 21 other than the supporting inflating part 35 on the outer peripheral side of the rectifying cloth 41 In a state where the internal pressure is increased from the part, the rectifying cloth 41 is inflated like an inner bag, and is strongly pressed against the front upper surface 2 a of the instrument panel 1 in front of the case 6. In the flow regulating cloth 41, even if the airbag 20 is in an inflated state, the inflation gas G flows from the inflow opening 25, so that the flow of the inflation gas G continues as long as the inflation gas G continues to flow. The internal pressure can be maintained higher than the portion of the bag body 21 that is downstream of the portion of the inflation gas G.

  Of course, the bag main body 21 other than the support inflating portion 35 is smoothly inflated by the inflation gas GB flowing out from the rear outflow opening 44 other than the front outflow opening 42 in the rectifying cloth 41, Tension is exerted on the wall 22 to have a certain degree of shape retention.

  Thereafter, as shown in FIG. 11, when the airbag 20 that has been inflated receives the head PH of the occupant P that moves forward by the restraint wall portion 23, the attachment portion 26 to the case 6 is set as the rotation center. The cylindrical wall portion 24 tends to rotate so as to move the rear portion 20a side upward. However, in this airbag 20, the support inflating portion 35 on the front end 24 e side is pressed against the front upper surface 2 a of the instrument panel 1 in front of the case 6 as an internal pressure higher than other parts, as in the flow regulating cloth 41. The peripheral wall of the support inflating portion 35 does not shrink and can receive a large reaction force from the front upper surface 2a of the instrument panel 1 including the back surface 12aa of the door portion 12a. The rotation to be moved upward can be reliably controlled.

  Note that, in the airbag 20 of the airbag apparatus M of the embodiment, the front-side outflow opening 42 of the rectifying cloth 41 is not fixed to the inner peripheral surface 36 of the support inflating portion 35, so Before the expansion of the portion 35 or when the internal pressure of the support expansion portion 35 after the completion of expansion is too high, the expansion gas G in the support expansion portion 35 is opened to the front outflow opening 42 of the rectifying cloth 41. Leaking from between the peripheral edge 43 of the cylindrical wall portion 24 and the inner peripheral surface 36 of the support expansion portion 35, along the inner peripheral surface of the cylindrical wall portion 24 on the outer surface side of the rectifying cloth 41, the rear side of the cylindrical wall portion 24. Thus, the inflation of the airbag 20 can be smoothly promoted, or the rapid increase in internal pressure of the support inflation portion 35 can be prevented.

  And in the airbag apparatus M of embodiment, even if a mounted vehicle type is changed, the shape of the bag main body 21 including the support expansion part 35 with respect to the windshield 5 and the instrument panel 1, and the inner peripheral surface 36 of the support expansion part 35 are used. Since it can be performed by setting the shape of the peripheral edge 43 of the front-side outflow opening 42 so as to be in contact with the airbag 20 itself, the upward movement of the airbag 20 can be easily dealt with.

  Therefore, in the airbag apparatus M of the embodiment, even if the mounted vehicle type is changed, it is possible to easily cope with the upward movement on the rear portion 20a side of the airbag 20 when the inflation is completed.

  Moreover, in the airbag 20 of the airbag apparatus M of the embodiment, the upper surface 24a side of the cylindrical wall portion 24 does not have to be supported by the windshield 5, so that the volume on the front side to be brought into contact with the windshield 5 is reduced. It can be omitted and can be configured as a small volume.

  By the way, in the airbag 20 of the embodiment, as shown in FIGS. 9 and 10, compared to the conventional airbag PA supported by the windshield 5, the front side volume FV component to be brought into contact with the windshield 5 is shown. Can be omitted. Further, in the airbag 20 according to the embodiment, the left and right edges of the rear panel 65 on the lower area 65f side are made to correspond to the side panel 50 and toward the lower end 65b to form a tapered straight line (straight line portion 69). The configuration is such that the vicinity of the rear end 24f on the lower surface 24d side of the cylindrical wall portion 24 extends obliquely forward and downward from the lower edge 23b of the restraint wall portion 23 and is separated obliquely downward and forward from the vicinity of the chest PB of the occupant P. Compared with the conventional airbag PA, the volume DV below the vicinity of the chest PB of the occupant P is omitted, and the configuration can be made as compact as possible. Incidentally, the conventional airbag PA has a volume of 80 liters, but in the airbag 20 of the embodiment, the volume is reduced to 50 liters.

  In the airbag device M of the embodiment, the length dimension OL of the peripheral edge 43 of the front outlet opening 42 in the rectifying cloth 41 is set to the inner periphery of the support inflating portion 35 at the portion where the peripheral edge 43 of the front outlet opening 42 contacts. The surface 36 is configured to be longer than the length dimension IL (see FIG. 4). Therefore, in the embodiment, when the airbag 20 is inflated, the peripheral edge 43 of the front-side outflow opening 42 in the rectifying cloth 41 is surely in contact with the inner peripheral surface 36 of the support inflating portion 35. The working gas G can be stored in the support inflating portion 35, and the internal pressure of the support inflating portion 35 can be stably increased as in the rectifying cloth 41.

  Further, in the airbag apparatus M of the embodiment, the rectifying cloth 41 has the front outflow opening 42 so that the inflation gas G flowing in from the inflow opening 25 flows in two directions (GF, GB) on both the front and rear sides. The rear outflow opening 44 is formed in a cylindrical shape extending in the front-rear direction. When the airbag 20 is completely inflated, the opening area BA of the rear outflow opening 44 is determined from the opening area MA of the intermediate portion 41c in the front-rear direction. It has a narrowed shape (see FIG. 9).

  Therefore, when the inflation gas G that has flowed into the rectifying cloth 41 from the inflow opening 25 of the bag body 21 flows out from the rear outflow opening 44, it flows out through the throttled rear outflow opening 44. The internal pressure in the rectifying cloth 41 is accurately increased. And the support expansion part 35 which has contacted the peripheral edge 43 of the opening 42 for front side outflow to the internal peripheral surface 36 raises an internal pressure smoothly similarly to the inside of the baffle cloth 41, and it is on the front side upper surface 2a of the instrument panel 1. Can be pressed. Further, in such a configuration, the inflation gas GB that flows out from the rear-side outflow opening 44 flows out back into the bag body 21 along the rear upper surface 2b of the instrument panel 1 at the rear of the case 6. The bag body 21 can be prevented from being expanded and inflated along the rear upper surface 2b of the instrument panel 1 and partially protruding to the occupant P side.

  If the above points are not taken into consideration, the outflow opening of the flow rectifying cloth may be provided with an outflow opening so as to flow to the left and right sides on the rear side in addition to the front outflow opening.

  Further, in the embodiment, when the airbag 20 is completely inflated, the rectifying cloth 41 substantially indicates the front FD of the opening 42a of the front outflow 42 and the direction BD of the opening 44a of the rear outflow opening 44. The openings 44a are arranged so as to be orthogonal to each other so that the direction of the opening surface 44a of the rear outflow opening 44 is directed to the oblique rear lower side BD. Therefore, in such a configuration, the directions of the inflation gases GF and GB flowing out from the front outflow opening 42 and the rear outflow opening 44 of the rectifying cloth 41 intersect so as to be orthogonal to each other, and the rear outflow The direction of the expansion gas GB flowing out from the opening 44 is configured to be reversed with the upward direction of the expansion gas G flowing into the rectifying cloth 41 from the inflow opening 25, and from the rear outflow opening 44. The expansion gas GB which is about to flow out is subjected to flow resistance in the flow straightening cloth 41, and the internal pressure in the flow straightening cloth 41 can be easily increased. Similarly to the inside of the rectifying cloth 41, the support inflating portion 35 in contact with 36 can raise the internal pressure more smoothly and can be brought into pressure contact with the front upper surface 2 a of the instrument panel 1. Further, the inflation gas GB flowing out from the rear outflow opening 44 is directed obliquely rearward and downward in the bag body 21 along the rear surface 3 from the rear upper surface 2b of the instrument panel 1 behind the case 6. Since it flows out, it can suppress that the bag main body 21 expand | deploys along the rear surface 3 from the rear side upper surface 2b of the instrument panel 1, and protrudes further to the passenger | crew P side further.

  Furthermore, in the embodiment, the rear support surface 30 of the airbag 20 comes into contact with the rear wall contact portion 31 that contacts the vicinity of the rear wall 8b of the case 6 and the rear upper surface 2b of the instrument panel 1 at the rear of the case 6. A rear instrument panel abutting portion 33 that abuts on the rear surface 3 side. The rear wall contact portion 31 and the rear instrument panel contact portion 33 are in contact with the rear wall 8b of the case 6 and the rear upper surface 2b of the instrument panel 1 that are substantially orthogonal to each other. However, the two side panels 50L and 50R that form the lower surface 24b side of the cylindrical wall portion 24 are connected to each other from the rear edge 26b of the inflow opening 25 in the rear connection portion 55 of the lower edge side connection portion 52 that are mutually connected. The length dimension VL in the front-rear direction from the bottom wall portion 7 of the case 6 to which the airbag 20 is attached to the rearmost instrument panel 1 to the rear of the case 6 is measured. The height dimension HB up to the side upper surface 2b (see FIG. 1) is set to be equal to each other, and there are two side surfaces at the intersection 2c between the rear wall 8b of the case 6 and the rear upper surface 2b of the instrument panel 1. The concave top portions 57c of the V-groove portions 57 that join the lower edge side binding portions 52 of the side panels 50L and 50R are arranged so as to fit (see FIG. 12). Therefore, the rear instrument panel abutting portion 33 which is a rear part from the intersection 2c between the rear wall 8b of the case 6 and the rear upper surface 2b of the instrument panel 1 is in contact with the rear wall 8b of the case 6 as much as possible. Without being influenced by the reaction force acting on the front upper side of the wall contact portion 31, a wide contact area is secured from the vicinity of the intersecting portion 2 c, and is supported from the rear upper surface 2 b to the rear surface 3 of the instrument panel 1. The That is, even if the instrument panel 1 is bent downward from the upper surface 2 side along the substantially horizontal direction behind the case 6 and the rear surface 3 along the substantially vertical direction is disposed, the airbag 20 at the completion of the inflation is provided. The rear instrument panel abutting portion 33 that abuts from the rear upper surface 2b to the rear surface 3 side of the instrument panel 1 in a large area causes a rearward swing with the attachment portion 26 to the case 6 as the center of rotation. The movement can be accurately suppressed, and the constraining wall portion 23 can be quickly arranged at a predetermined position (see FIGS. 9 and 10). Further, when the restraint wall portion 23 of the airbag 20 receives the head PH of the occupant P, the rear instrument panel abutting portion 33 is in contact with the rear surface 3 of the instrument panel 1 in a wide area, and quickly The airbag 20 can catch the passenger | crew's P head PH with sufficient cushioning property, ensuring force.

  Of course, if the above points are not taken into consideration, the V-groove portion 57 may not be provided in the lower edge side coupling portion 52 of the two side surface panels 50L and 50R.

  Furthermore, in the airbag apparatus M of the present invention, the case where it is mounted on the upper surface 2 side in the vicinity of the corner portion 4 of the instrument panel 1 is shown, but the top mount to be mounted on the upper surface 2 of the instrument panel 1 that is separated forward from the corner portion 4. It may be configured as a type.

1 ... (Instrument panel) Instrument panel,
2… Top surface,
5 ... Windshield,
6 ... Case,
20 ... Airbag,
20a ... (the back of the airbag),
21 ... Bag body,
22 ... the outer peripheral wall (of the airbag),
23: Restraint wall,
24 ... cylindrical wall,
24a ... (on the cylindrical wall) upper surface,
24b ... the lower surface (of the cylindrical wall),
24c ... left side surface (of the cylindrical wall),
24d ... right side surface (of the cylindrical wall),
24e ... front end (of the cylindrical wall),
25 ... opening for inflow,
26 ... attachment site,
35 ... support expansion part,
36 ... the inner peripheral surface (of the support expansion part),
41 ... Rectifier cloth,
41c ... intermediate part (in the front-rear direction),
42 ... opening for front outflow,
43 ... peripheral edge (front outflow opening),
44: Rear outlet opening,
OL ... length dimension (periphery of front outlet)
IL: Length dimension (inner peripheral surface of the support expansion part),
FD: Orientation (of the opening of the front outlet),
BD: Orientation (of the opening of the rear outlet),
MA ... open area (in the middle)
BA ... Opening area (of rear outlet opening),
G ... expansion gas,
P ... Crew,
M ... (for passenger seat) Airbag device.

Claims (4)

Airbag
Attached to the case placed on the upper surface side of the instrument panel in front of the passenger seat, folded and stored,
When inflating gas flows in, it protrudes from the case and is configured to expand and expand rearward from the upper surface side of the instrument panel below the windshield.
For the front passenger seat having a configuration in which a support inflating portion that is brought into contact with the upper surface of the front side of the case in the instrument panel is disposed at the front end portion when the inflation is completed, and the upward movement of the rear side of the airbag is suppressed. An airbag device,
The airbag includes a bag body that constitutes an outer peripheral wall, and a rectifying cloth that is disposed in the bag body and controls the flow of the inflation gas flowing into the bag body.
The bag body is disposed at the rear end when the inflation is completed, and includes a restraint wall portion that catches an occupant, and a tubular wall portion that closes the front end and extends forward from the outer peripheral edge of the restraint wall portion in a tubular shape. Prepared,
The cylindrical wall portion has an inflow opening for allowing the inflating gas to flow into the lower surface on the front end side when the expansion is completed, and the periphery of the inflow opening is used as an attachment part to be attached to the case. The support inflating part is arranged on the front end side on the front side of the inflow opening, and is configured,
The rectifying cloth has an outflow opening so that the inflation gas flowing in from the inflow opening flows in a plurality of directions including the front side, and covers the upper side of the inflow opening. Attached to the periphery of the inflow opening;
When the inflation of the airbag is completed, the peripheral edge of the outflow opening on the front side extends from the lower surface side of the cylindrical wall portion to the upper surface side through the left and right side surfaces in the support inflating portion. An airbag device for a passenger seat, which is configured to be contactable.   The flow straightening cloth is configured to make the length of the peripheral edge of the outflow opening on the front side longer than the length of the inner peripheral surface of the support inflating portion at the portion in contact with the peripheral edge of the outflow opening on the front side. The airbag device for a passenger seat according to claim 1, wherein the airbag device is a passenger seat. The rectifying cloth is
The expansion gas flowing in from the inflow opening is provided with the front outflow opening and the rear outflow opening so as to flow in two directions on both the front and rear sides, and has a cylindrical shape extending in the front-rear direction,
3. The passenger seat airbag according to claim 1, wherein when the airbag is completely inflated, the rear outlet opening is narrowed from the opening area of an intermediate portion in the front-rear direction. apparatus.   When the airbag is completely inflated, the opening of the rear outflow opening is substantially orthogonal to the direction of the opening surface of the front outflow opening and the direction of the opening surface of the rear outflow opening. The airbag device for a passenger seat according to claim 3, wherein the air bag device is disposed so that the direction of the surface is obliquely rearward and downward.

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