JP2007276536A - Airbag device for front passenger seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device for a front passenger seat allowing right and left shoulder constraining portions of an airbag to easily secure a sufficient reaction force. <P>SOLUTION: The airbag 20 of the airbag device for a front passenger seat is provided with shoulder constraining portion 31 projecting outward on both right and left sides to constrain right and left shoulders of an occupant, on an occupant constraininging surface 30 on a rear surface side at the time of completing expansion. The airbag 20 is formed by vertically folding a bag-shaped bag material 36 extending in a band shape, and uniting both ends 37, 38 so as to vertically be united at a position on the front portion 20a side of the airbag. The bag material is disposed on the rear portion 20b side of the airbag 20b side as a bending portion 40 folded at the time of forming the airbag, between an upper expanding portion 25 and a lower expanding portion 21 disposed at upper/lower sides of the airbag on both end sides. The bending portion 40 has a communicating portion 41 interposing an expansion gas non-flowing portion 42 therebetween, and expanding so as to vertically extend in a rod shape for forming the shoulder constraining portions 31 on both right and left sides. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In operation, the present invention allows an inflating gas to flow in, expands and expands rearward from a housing part on the upper surface side of the instrument panel in front of the passenger seat, and windshields above the upper surface of the instrument panel and the instrument panel. It is related with the airbag apparatus for front passenger seats comprised including the airbag arrange | positioned so that it may block between and may be extended back.

  Conventionally, in this type of passenger seat airbag device, there has been a configuration in which an inflated airbag can receive the upper body of an occupant softly (see, for example, Patent Document 1). In this passenger seat airbag device, the rear surface of the airbag at the time of completion of inflation is used as an occupant restraint surface that catches the occupant, and the occupant restraint surface extends in the vertical direction on both the left and right sides and protrudes rearward. The shoulder restraint portions are arranged so as to restrain the left and right shoulder portions of the occupant.

  In such an airbag, the occupant restraint surface on the rear surface side when the inflation is completed includes left and right shoulder restraint portions protruding rearward, and when the occupant moving forward is received by the occupant restraint surface, Both shoulders are received by the shoulder restraints, and a certain amount of kinetic energy is absorbed, and then the occupant's chest is received between the left and right shoulder restraints on the occupant restraint surface, and Since the head of the occupant is received by the occupant restraint surface, the chest and head of the occupant are received by the occupant restraint surface with the speed of forward movement sufficiently reduced, and the upper body of the occupant is air The bag will be softly received.

Further, as this type of airbag, plate-like bag portions having a thickness direction in the left-right direction are arranged so as to be juxtaposed along the left-right direction. There is also a thing which restrains (for example, refer patent document 2).
JP-A-2005-247118 Japanese Patent No. 2005-145225

  However, in the conventional airbag device for the passenger seat, when the airbag that has been deployed and inflated floats upward, for example, away from the surface of the instrument panel, , Support from the surface of the instrument panel is not received, it is difficult to ensure a sufficient reaction force.

  The present invention solves the above-described problems, and an object of the present invention is to provide a passenger seat airbag device in which left and right shoulder restraint portions of the airbag can easily secure a sufficient reaction force.

The airbag device for a passenger seat according to the present invention, when activated, flows in inflation gas, expands and inflates rearward from the storage portion on the upper surface side of the instrument panel in front of the passenger seat, and the upper surface of the instrument panel The air bag is arranged so as to cover the windshield above the instrument panel and extend rearward, and the air bag has an occupant restraint surface that catches the occupant on the rear side when deployment is completed. For passenger seats with restraint surfaces that extend along the vertical direction on both the left and right sides and protrude rearward so that the left and right shoulders of the passenger can be restrained. An airbag device,
The airbag is folded so that the bag-shaped bag material extending in the front-rear direction is overlapped in the vertical direction, and both ends of the bag material are joined so as to face each other in the vertical direction at the position on the front side of the airbag. As a structure to form,
A belt-shaped bag material is located on the lower side of the airbag and is located on the lower side of the inflation gas, and on the upper side of the airbag and located on the lower side of the inflation gas. Are arranged on both end sides, and between the lower inflatable portion and the upper inflatable portion are arranged on the rear side of the airbag as a bent portion that is folded when the airbag is formed,
The bent portion of the bag material can be formed on the left and right sides of the bag material so that left and right shoulder restraint portions can be formed. Between the left and right communication portions, an inflow suppression portion that suppresses the inflow of the expansion gas and is recessed forward from the communication portion is provided.

  In the passenger seat airbag device according to the present invention, when the airbag is inflated by inflating the inflation gas, the communication portion of the bag material constituting the left and right shoulder restraint portions on the passenger restraint surface of the airbag is On the left and right sides of the surface, in a triangular space that spreads upward toward the rear side between the instrument panel and the windshield, it swells so as to extend in a vertical bar shape. And these communication parts are arranged in the bent part when the belt-like bag material extending in the front-rear direction is folded so as to overlap in the up-down direction. It is pulled to the front side so as to shorten the distance from the front side of the airbag, which is the part side and is the part attached to the storage part side. That is, the left and right communication parts are pulled to the front side narrowing the upper and lower spaces in the triangular space between the instrument panel and the windshield so that the upper and lower ends are brought into contact with the windshield and the instrument panel. Then swell. Therefore, if the airbag is completely inflated, the upper and lower ends of the communication part itself are supported directly from the front side (rear side) of the windshield and instrument panel, or By interposing a part of the inflating part and the lower inflating part, it is possible to secure a state in which the front side is supported from the front side (rear side) of the windshield or the instrument panel.

  As a result, the right and left shoulder restraints are used when the airbag is positioned at the left and right sides of the inflow restraint portion recessed toward the front side and receives the occupant by the left and right shoulder restraint portions. The part can easily receive support from the windshield and the instrument panel, and can secure a sufficient reaction force to receive and protect the occupant.

  Therefore, in the passenger airbag device according to the present invention, the airbag at the time of completion of inflation is supported on the front side by the instrument panel and the windshield, and the left and right shoulder restraint portions of the airbag ensure a stable reaction force. And catch the crew.

  Further, in the airbag device for the passenger seat according to the present invention, it is possible to manufacture an airbag including left and right shoulder restraint portions without disposing a tether or the like in the operation of coupling both ends of the bag material to each other. An airbag can be manufactured while suppressing an increase in manufacturing man-hours and costs as much as possible.

  Then, if the bag material is formed by stacking two bag base fabrics having the same outer shape and connecting the peripheral edges, planar stitching using the two bag base fabrics, etc. With this combination work, the bag material can be manufactured, and the manufacturing steps and cost of the airbag can be reduced.

  In this case, the inflow suppressing part may be formed in a sheet shape formed by combining the entire peripheries of the peripheral edges of the inflow suppressing part when the two base fabrics for bags are combined, or the air at the time of completion of expansion. A through hole that penetrates in the front-rear direction of the bag may be provided. By the way, if the inflow suppression part is in the form of a sheet, when the left and right shoulder restraint parts catch the occupant, the movement that spreads outward to the left and right can be restricted, and the shoulder part of the occupant is restrained by the left and right shoulder restraint parts After that, the sheet-like inflow suppressing part that is recessed forward can softly receive the occupant's chest that has reduced the speed of forward movement. Also, if the inflow suppressing part is configured with a through hole, the left and right shoulder restraint parts are not connected to each other at the part of the through hole, and can be separately deformed when receiving the occupant. It is possible to improve the cushioning property, and after restraining the occupant's shoulders with the left and right shoulder restraint portions, the occupant's chest that has reduced the speed of forward movement is recessed in the inflow restraint portion recessed forward. It can be softly received by the inner facing surfaces of the left and right shoulder restraining portions constituting the peripheral surface.

  Moreover, you may comprise the site | part arrange | positioned in the front part side of the airbag in the upper expansion part of a bag material from the plate-shaped part which does not allow the gas for inflation to flow. In such a configuration, the volume of the airbag inflow of the inflation gas can be reduced by the amount that the plate-shaped portion is not inflated, and the time from the start of inflation of the airbag to the completion of inflation can be shortened. Of course, the plate-like portion is disposed on the front portion side of the airbag at the time of completion of the inflation away from the occupant restraint surface, and is a portion that does not need to contact and receive the occupant.

  In addition, the left and right communication parts of the bag material have tethers that extend forward and pass through the lower inflating part and are connected to the lower surface of the front part of the lower inflating part so as to prevent lateral blurring. It may be provided and configured. In such a configuration, when the airbag, which has been inflated, receives the left and right shoulders of the occupant by the shoulder restraint portion composed of the left and right communication portions, the occupant increases the kinetic energy and Even if the vehicle moves forward with a shift, the left and right shoulder restraint portions can stably receive the left and right shoulder portions of the occupant without shifting from the rear surface of the lower expansion portion or the upper expansion portion to the left or right.

  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 device M1 for a passenger seat according to the first embodiment is an instrument panel in front of a passenger seat (hereinafter referred to as an instrument panel). 1 is a top mount type mounted on the upper surface 1b side. The airbag device M1 for a passenger seat includes a folded airbag 20, an inflator 11 that supplies inflation gas to the airbag 20, a case 7 that stores and holds the airbag 20 and the inflator 11, and the airbag 20. A retainer 13 for attaching to the case 7 and an airbag cover 9 that covers the folded airbag 20 are provided.

  Note that the front-rear, up-down, left-right directions of the embodiment coincide with the front-rear, up-down, left-right directions when the vehicle travels straight when mounted on the vehicle.

  In the case of the embodiment, the airbag cover 9 is formed integrally with the instrument panel 1. The airbag cover 9 includes two door portions 9a and 9a that are opened to the front and rear sides by breaking the periphery when pushed by the inflating airbag 20 (see FIG. 4), and the door portions 9a and 9a. A peripheral wall portion 9b having a rectangular tube shape extending downward from the periphery of the rim is provided. The folded airbag 20 is stored with the portion surrounded by the peripheral wall portion 9 b of the airbag cover 9 and the peripheral wall portion 7 b of the case 7 on the bottom wall portion 7 a of the case 7 as the storage portion 5. .

  The case 7 is formed in a substantially rectangular parallelepiped shape made of sheet metal, and includes a rectangular plate-like bottom wall portion 7a and a rectangular tubular peripheral wall portion 7b extending upward from the outer peripheral edge of the bottom wall portion 7a. A hook 7c for locking the peripheral wall 9b of the airbag cover 9 is formed at the upper end of the peripheral wall 7b. An airbag 20 and an inflator 11 are fixed to the bottom wall portion 7a using a retainer 13.

  The retainer 13 has a substantially annular shape and includes four bolts 13 a extending downward. Each of the bolts 13 a has a peripheral edge of the inflow opening 22 for inflating the inflation gas of the airbag 20, and the case 7. By passing through the bottom wall portion 7a and the flange portion 11b of the inflator 11 and fastening the nut 14 to each bolt 13a, the peripheral edge of the inflow opening 22 of the airbag 20 and the flange portion 11b of the inflator 11 are connected. The case 7 is fixed to the bottom wall 7a.

  The inflator 11 has a substantially cylindrical shape with a flange portion 11b protruding from the outer periphery, and is configured by disposing a plurality of gas discharge ports 11a capable of discharging expansion gas above the flange portion 11b. The inflator 11 is inserted into the case 7 from the lower side of the bottom wall portion 7a of the case 7 into the case 7, in other words, the inflator 11 is inserted into the airbag 20 from the inflow opening 22, and the flange portion 11b. Is in contact with the lower surface of the bottom wall portion 7a, and in that state, is fixed to the bottom wall portion 7a by fastening the nut 14 to each bolt 13a of the retainer 13.

  As shown in FIGS. 1 to 5, the airbag 20 closes the space between the upper surface 1 b of the instrument panel 1 and the windshield 3 above the instrument panel 1 when the inflation gas G flows in and protrudes from the storage part 5. It expands and expands to extend rearward. The airbag 20 has a shape at the time of completion of inflation, a lower inflatable portion 21 disposed so as to contact the surface 1a from the upper surface 1b of the instrument panel 1 to the rear surface 1c, and a windshield 3 above the instrument panel 1. It has a shape including an upper inflating portion 25 disposed so as to contact and a rear inflating portion 29 disposed on the rear surface side. The rear inflating portion 29 has an occupant restraint surface 30 that receives the occupant P on the rear surface, and the occupant restraint surface 30 is arranged so as to extend in the vertical direction on both the left and right sides and to protrude rearward. A recessed portion recessed between the shoulder restraining portions 31 (31L, 31R) provided between the left and right shoulder restraining portions 31 and the shoulder restraining portions 31 (31L, 31R) that can restrain the left and right shoulder portions S (SL, SR) of the occupant P. 32 is disposed.

  The lower inflating portion 21 is provided with an inflow opening 22 for allowing the inflating gas G to flow into the lower surface on the front portion 21 a side, and the bolts 13 a of the retainer 13 are inserted through the periphery of the inflowing opening 22. A mounting hole 23 is provided. In addition, a vent hole 27 for exhausting excess inflation gas G is opened in the upper expansion portion 25. The lower expansion portion 21 is a portion on the upstream side of the expansion gas G, and the upper expansion portion 25 is a portion on the downstream side of the expansion gas G from the lower expansion portion 21. Further, as shown in FIG. 3C, the front end 25b is coupled to the front end 21b side of the lower inflating portion 21 and the inflation gas G flows into the position of the upper inflating portion 25 on the front portion 20a side of the airbag. A rectangular plate-shaped plate portion 26 that is not allowed to be disposed is disposed.

  As shown in FIGS. 3B and 3C, the airbag 20 is folded in such a manner that a bag-like bag material 36 extending in the front-rear direction is overlapped in the vertical direction, and the end portions 37, 38 of the bag material 36 are mutually ( The front ends 21b and 25b are formed on the front portion 20a side of the airbag 20 by being sewn together while facing each other in the vertical direction. And the edge part 37 side of the bag material 36 is arrange | positioned at the lower part 20c side of the airbag 20, and comprises the lower expansion part 21, and the edge part 38 side of the bag material 36 is arrange | positioned at the upper part 20d side of the airbag 20. Thus, the upper expansion portion 25 is configured.

  Further, between the lower inflating portion 21 and the upper inflating portion 25 in the bag material 36, a rear inflating portion 29 on the rear portion 20b side of the airbag 20 is configured as a bent portion 40 that is folded when the airbag 20 is formed. The bent portion 40 is connected to the lower inflating portion 21 and the upper inflating portion 25 so as to be able to form left and right shoulder restraining portions 31L and 31R, and is connected to a communicating portion 41 (41L and 41R) that bulges so as to extend in a bar shape in the vertical direction. Are disposed on the left and right sides, and the inflow of the expansion gas G is suppressed between the left and right communication portions 41L and 41R. In the case of the embodiment, the inflow suppressing part 42 is arranged to prevent the inflating gas G from flowing in.

  Further, in the case of the first embodiment, as shown in FIGS. 3A and 3B, the bag material 36 is formed by stacking two bag base fabrics 44 (44J, 44I) having the same outer shape so that the peripheral edges are mutually overlapped. At the same time, a sheet-like rectangular plate-like sheet material 46 for forming the plate-like portion 26 is sewn and joined to the end portion 38 side. The bag base fabric 44 and the sheet material 46 are formed of a woven fabric woven with yarns made of synthetic fibers such as flexible polyester and polyamide. Furthermore, each base fabric 44 is formed with a through hole 45 for forming an inflow suppressing portion 42 disposed in the bent portion 40, and the peripheral edges of the through holes 45 are also stitched together. . The communication portions 41L and 41R are disposed on the left and right sides of the through hole 45.

  In addition, an inflow opening 22, a mounting hole 23, and a vent hole 27 are formed in the bag base fabric 44 </ b> J disposed on the outer peripheral side when the airbag 20 is formed from the bag material 36.

  Then, as shown in FIGS. 3A to 3C, the bag base fabrics 44 </ b> J and 44 </ b> I are overlapped with the sheet material 46 therebetween, and the outer peripheral edges of the bag base fabrics 44 </ b> J and 44 </ b> I and the peripheral edges of the through-hole 45. Bag material 36 is formed, and the bag material 36 extending in the front-rear direction is folded so as to overlap in the vertical direction, and the front end 21b on the end 37 side of the bag material 36 and the plate shape on the end 38 side are folded. If the front end 25b of the portion 26 is opposed in the vertical direction and joined by stitching, the airbag 20 can be manufactured.

  The mounting of the airbag 20 thus manufactured on the vehicle will be described. The retainer 13 is disposed in the airbag 20 so that the bolt 13a protrudes from each mounting hole 23, and the airbag 20 is folded. Further, the folded airbag 20 is wrapped with a wrapping material (not shown) that can be broken so as not to collapse.

  Then, the folded airbag 20 is placed on the bottom wall 7 a of the case 7 while the bolts 13 a are inserted through the bottom wall 7 a of the case 7 from above. Next, the upper side of the inflator 11 is inserted into the inflow opening 22 from below through the bottom wall portion 7 a, and each bolt 13 a protruding downward from the bottom wall portion 7 a is inserted into the flange portion 11 b of the inflator 11. Then, if the nut 14 is fastened to each bolt 13a protruding from the flange portion 11b of the inflator 11, the airbag 20 and the inflator 11 folded with respect to the bottom wall portion 7a of the case 7 can be attached.

  Thereafter, the peripheral wall portion 7b of the case 7 is inserted into the peripheral wall portion 9b of the airbag cover 9 in the instrument panel 1 mounted on the vehicle, and the hooks 7c of the case 7 are locked to the peripheral wall portion 9b. Further, if the bracket (not shown) of the case 7 is connected and fixed to the vehicle body side, the passenger seat airbag device M1 can be mounted on the vehicle.

  After the passenger seat airbag device M1 is mounted on the vehicle, if the passenger seat airbag device M1 is activated and the inflation gas G is discharged from each gas discharge port 11a of the inflator 11, the airbag 20 is By inflating and opening the door portions 9a, 9a of the airbag cover 9 back and forth, the airbag 20 passes through the opening 9c of the door portions 9a, 9a in the airbag cover 9 and moves upward from the storage portion 5. And further expands and expands backward while closing the space between the upper surface 1b side of the instrument panel 1 and the windshield 3 (see the two-dot chain line in FIG. 1 and A in FIG. 4).

  At the time of inflation, in the airbag 20 of the first embodiment, if the inflation gas G is introduced and inflated, the bag material 36 constituting the left and right shoulder restraint portions 31L and 31R on the passenger restraint surface 30 of the airbag 20 is expanded. In the triangular space TS (see FIG. 1) in which the communication portions 41L and 41R spread on the left and right sides of the occupant restraint surface 30 toward the rear side between the instrument panel 1 and the windshield 3 in the vertical direction. It swells to extend like a rod. And these communication parts 41L and 41R are arrange | positioned at the bending part 40 at the time of folding the strip | belt-shaped bag raw material 36 extended in the front-back direction so that it may overlap in an up-down direction. The front portion 20a side of the airbag 20 which is a portion to be attached to the storage portion 5 side on the side of the connecting portion side of the end portions 37 and 38 of the material 36 (specifically, the inflow opening 22 and the attachment hole pressed by the retainer 13) 23), so that the distance to the front side is shortened. That is, the left and right communication portions 41L and 41R are pulled to the front side in the direction of narrowing the upper and lower spaces in the triangular space TS between the instrument panel 1 and the windshield 3, and the upper and lower end portions 41a and 41b are connected to the windshield 3 It swells in contact with the instrument panel 1. Therefore, as shown in FIG. 4A, when the airbag 20 is completely inflated, the upper and lower end portions 41a and 41b of the communication portions 41L and 41R themselves are located on the front side of the windshield 3 and the instrument panel 1. It is supported directly from the rear surface 1c, or the front side is supported from the front surface 1a side (rear surface 1c side) of the windshield 3 or the instrument panel 1 with a part of the upper expansion part 25 or the lower expansion part 21 interposed therebetween. Can be secured. In the first embodiment, the lower end portion 41b of the communication portions 41L and 41R serving as the lower end portion 31b of the shoulder restraining portions 31L and 31R is directly supported by the rear surface 1c of the instrument panel 1, and the shoulder Upper ends 41a of the communication portions 41L and 41R, which are upper ends 31a of the restraining portions 31L and 31R, are supported by the windshield 3 with the upper expansion portion 25 interposed therebetween.

  As a result, when the airbag 20 receives the shoulder portion S (SL, SR) of the occupant P with the left and right shoulder restraint portions 31L and 31R, as shown in FIG. The portions 31L and 31R can receive support from the windshield 3 and the instrument panel 1, secure a sufficient reaction force, receive and protect the left and right shoulders SL and SR of the occupant P, and move forward The head H of the occupant P whose speed is reduced is received on the rear surface 25c side of the upper inflating portion 25, and the chest B of the occupant P is the shoulder restraint portion 31L in the recess 32 between the shoulder restraint portions 31L and 31R. , 31R is received by the mutually opposite inner surfaces 31c, the abdomen C of the occupant P is received by the rear surface 21c side of the lower inflating part, and the upper body U of the occupant P is softly received by the occupant restraint surface 30 of the airbag 20. Protected.

  Therefore, in the passenger seat airbag device M1 of the first embodiment, the airbag 20 at the time of completion of inflation is supported on the front side by the instrument panel 1 and the windshield 3, and the left and right shoulder restraint portions 31L, 31R of the airbag 20 are supported. However, a stable reaction force can be secured and the occupant P can be received.

  Further, in the passenger seat airbag device M1 of the first embodiment, the left and right shoulder restraint portions are joined without connecting a tether or the like in the operation of joining the end portions 37, 38 on both sides of the bag material 36 to each other. The airbag 20 provided with 31L and 31R can be manufactured, and the airbag 20 can be manufactured while suppressing an increase in manufacturing man-hours and costs as much as possible.

  Furthermore, in the first embodiment, the bag material 36 is formed by stacking two bag base fabrics 44 (44J, 44I) having the same outer shape with the sheet material 46 therebetween, and joining the peripheral edges to each other. The bag material 36 can be manufactured by a joining operation such as planar stitching using the two bag base fabrics 44J and 44I, and the manufacturing man-hour and cost of the airbag 20 can be reduced. The sheet material 46 may be bonded to one outer side without being bonded between the bag base fabrics 44J and 44I. Further, the portion of the sheet material 46 may be integrally formed on both of the bag base fabrics 44J and 44I, or may be formed integrally on one of the bag base fabrics 44J and 44I. However, it may be formed as a plate-like portion 26 made of a single cloth material.

  Moreover, in the case of 1st Embodiment, the inflow suppression part 42 which comprises the recessed part 32 dented to the front side between the shoulder restraint parts 31L and 31R in the passenger | crew restraint surface 30 of the airbag 20 is the airbag 20 at the time of completion of expansion. A through-hole 45 is provided to penetrate in the front-rear direction. Therefore, the left and right shoulder restraint portions 31L and 31R are not connected to each other at the portion of the through hole 45, can be separately deformed when receiving the occupant P, and can improve cushioning, and The inner circumference of the inflow suppressing portion 42 in which the chest B of the occupant P whose forward moving speed is reduced after the occupant P shoulders SL, SR are restrained by the left and right shoulder restraint portions 31L, 31R is recessed forward. It can be softly received by the inner facing surfaces 31c of the left and right shoulder restraining portions 31L, 31R constituting the surface.

  If this point is not taken into account, using two bag base fabrics 44J and 44I that do not include the through hole 45, like the bag material 36A that forms the airbag 20A shown in FIGS. It is good also as a sheet form formed by combining the peripheries of the peripheral edges of the inflow suppressing portion 42A when both are combined. In the concave portion 32A constituted by such a sheet-like inflow suppressing portion 42A, when the left and right shoulder restraining portions 31L and 31R receive the occupant, the left and right shoulders can be restricted from moving to the left and right. After restraining the occupant's shoulder with the restraining portions 31L, 31R, the seat-like inflow suppressing portion 42A, which is recessed forward, can softly receive the occupant's chest that has reduced the speed of forward movement. Incidentally, since the inflow suppressing part only has to be recessed forward from the communication part, the inflow suppressing part may be configured to allow the inflating gas to flow in. For example, when the bag base fabrics 44J and 44I are joined, two in-line stitching portions extending in the front-rear direction are arranged side by side at the arrangement position of the inflow restraining portion so as to be narrowed between each other. May be formed. In this case, although a slight amount of inflation gas flows between the left and right stitching portions, a recess that is recessed forward from the left and right communication portions can be formed.

  Moreover, in the airbag 20 of 1st Embodiment, the site | part arrange | positioned in the front part 20a side of the airbag 20 in the upper expansion part 25 of the bag raw material 36 is comprised from the plate-shaped part 26 which does not flow in the gas for inflation. Yes. Therefore, the volume of the airbag 20 into which the inflation gas flows can be reduced by the amount that the plate-like portion 26 is not inflated, and the time from the start of inflation of the airbag 20 to the completion of inflation can be shortened. Of course, the plate-like portion 26 is disposed on the front portion 20a side of the airbag 20 at the time of completion of inflation away from the occupant restraint surface 30, and is a portion that does not need to contact and receive the occupant P. There will be no hindrance.

  Furthermore, you may comprise like the airbag apparatus M2 for passenger seats of 2nd Embodiment shown in FIGS. In the airbag 20B of the second embodiment, as shown in FIGS. 9 to 11, the left and right communication portions 41L and 41R of the bag material 36B can be prevented from shaking in the left and right directions, respectively. 11 extends from the front surface side (see B in FIG. 11) near the upper end portions 41a and 41b to the front side while passing through the lower expansion portion 21, and is connected to the lower surface 21d on the rear side of the inflow opening 22 of the lower expansion portion 21. Tethers 57 and 58 are provided.

  That is, as shown in FIGS. 11B and 11C, the airbag 20B is folded so that the bag-shaped bag material 36B extending in the front-rear direction is overlapped in the vertical direction, as in the first embodiment. The end portions 37 and 38 (the front ends 21b and 25b) are joined to each other on the front portion 20a side of the airbag 20B by stitching them while facing each other in the vertical direction. Of course, the end portion 37 side of the bag material 36B is disposed on the lower portion 20c side of the airbag 20B to constitute the lower inflating portion 21, and the end portion 38 side of the bag material 36B is disposed on the upper portion 20d side of the airbag 20B. Thus, the upper expansion portion 25 is configured.

  Further, between the lower inflating portion 21 and the upper inflating portion 25 in the bag material 36B, a rear inflating portion 29 on the rear portion 20b side of the airbag 20B is configured as a bent portion 40 that is folded when the airbag 20B is formed. The bent portion 40 is connected to the lower inflating portion 21 and the upper inflating portion 25 so as to be able to form left and right shoulder restraining portions 31L and 31R, and is connected to a communicating portion 41 (41L and 41R) that bulges so as to extend in a bar shape in the vertical direction. Are disposed on both the left and right sides, and an inflow suppressing portion 42B including a through hole 55 through which the expansion gas G does not flow is disposed between the left and right communication portions 41L and 41R in order to form the recess 32B. It is configured. In the second embodiment, due to the length of the tethers 57 and 58, as shown in FIG. 11C, unlike the first embodiment, the bent portion 40 is not folded in two but from the side. As seen, it is folded in a horizontal W shape.

  Further, in the case of the second embodiment, the bag material 36B is formed by stacking two bag base fabrics 54 (54J, 54I) having the same outer shape and joining the peripheral edges to each other, and at the end 38 side airbag. A bag-like sheet material 56 for forming the plate-like portion 26 is stitched to and bonded to the bag base fabric 54J on the outer peripheral side of 20B, and further, the bag base on the inner peripheral side of the airbag 20B. Band-like tethers 57 and 58 are joined by stitching so as to extend from the cloth 54I. The bag base fabric 54 (54J, 54I), the sheet material 56, and the tethers 57 and 58 are formed of a woven fabric woven with yarns made of synthetic fibers such as flexible polyester and polyamide. Furthermore, each base fabric 54 (54J, 54I) is formed with a through hole 55 for forming the inflow suppressing portion 42B disposed in the bent portion 40, and through holes for inserting the tethers 57, 58. 59, 60 are formed, and the peripheral edges of the through holes 55, 59, 60 are also stitched together. The communication portions 41L and 41R are disposed on the left and right sides of the through hole 55. Further, the sheet material 56 may be coupled to the bag base fabric 54I side, or may be coupled between the bag base fabrics 54I and 54J. Furthermore, the portion of the sheet material 56 may be integrally formed on both of the bag base fabrics 54J and 54I, or may be formed integrally on one of the bag base fabrics 54J and 54I. However, it may be formed as a plate-like portion 26 made of a single cloth material.

  In addition, an inflow opening 22 and a mounting hole 23 are formed in the bag base fabric 54J disposed on the outer peripheral side when the airbag 20 is formed from the bag material 36B.

  Then, the sheet material 56 and the tethers 57 and 58 are coupled to predetermined bag base fabrics 54J and 54I, and the bag base fabrics 54J and 54I are overlapped so that the outer peripheral edges of the bag base fabrics 54J and 54I and the through holes are overlapped. The peripheral edges of 55, 59, 60 are joined together to form a bag material 36B, the tip side of the tethers 57, 58 is inserted into the through holes 59, 60 and joined to the lower surface 21d side of the lower inflating portion 21, If the front end 21b on the end 37 side of the bag material 36B and the front end 25b of the plate-like portion 26 on the end 38 are opposed to each other in the vertical direction, the airbag 20B can be manufactured. .

  As in the first embodiment, the airbag 20 </ b> B manufactured in this way accommodates and folds the retainer 13, attaches it to the case 7 together with the inflator 11, and further attaches the assembly to the instrument panel 1. The seat airbag device M2 can be mounted.

  Even in the passenger seat airbag device M2 of the second embodiment, when the airbag 20B is deployed and inflated, the communication portions 41L and 41R serving as the end portions 31b on the lower side of the shoulder restraining portions 31L and 31R of the airbag 20B are used. The lower end portion 41b is directly supported by the rear surface 1c of the instrument panel 1, and the upper end portion 41a of the communication portions 41L and 41R serving as the upper end portion 31a of the shoulder restraining portions 31L and 31R is The front side is supported by the windshield 3 with the inflating portion 25 interposed, and the same actions and effects as in the first embodiment can be obtained.

  Further, in the second embodiment, as shown in FIGS. 9 and 10, the left and right communication portions 41L and 41R of the bag material 36B penetrate the lower inflating portion 21 from the front side near the upper end portions 41a and 41b, respectively. The tethers 57 and 58 are configured to extend forward and to be connected to the lower surface 21d on the front portion 21a side of the lower inflating portion 21, and the tethers 57 and 58 are regulated by the inner peripheral surfaces of the through holes 59 and 60. The left and right shoulder restraint portions 31L and 31R configured by the left and right communication portions 41L and 41R are less likely to shake in the left-right direction. Therefore, when the airbag 20B that has been inflated receives the left and right shoulder portions SL, SR of the occupant P by the left and right shoulder restraint portions 31L, 31R configured by the left and right communication portions 41L, 41R, Even if the kinetic energy is increased and the left and right shoulder restraints 31L and 31R move forward and left and right, the left and right shoulder restraint portions 31L and 31R are stable without shifting left and right from the rear surfaces 21c and 25c of the lower expansion portion 21 and the upper expansion portion 25. Thus, the left and right shoulders SL and SR of the occupant P can be received (see FIGS. 12 and 13).

  Further, in the airbag 20B of the second embodiment, the tethers 57 and 58 complete the inflation in a state where the communication portions 41L and 41R constituting the left and right shoulder restraint portions 31L and 31R are pulled forward, When the lower end portion 41b is inflated so as to come into contact with the rear surface 1c of the instrument panel 1, the lower portion of the airbag 20B from the lower inflatable portion 21 to the end portions 41b of the communication portions 41L and 41R (shoulder restraining portions 31L and 31R). 20c smoothly adheres to the surface 1a side from the upper surface 1b to the rear surface 1c of the instrument panel 1 so that it can be further supported by the instrument panel 1.

  Furthermore, in the airbag 20B of the second embodiment, the through hole 55 is disposed to extend slightly toward the end portion 37 side of the bag material 36B, and the recess 32B between the left and right shoulder restraint portions 31L, 31R is Even if the child seat 61 is disposed so as to contact the rear surface 1c of the instrument panel 1 as shown in FIG. 14, the child seat 61 is disposed so as to extend to the vicinity of the rear surface 1c of the instrument panel 1. The state which accommodates the upper part 61a can be ensured, and the airbag 20B can complete expansion | swelling, without contacting the child seat 61 so that it may move.

It is a schematic longitudinal cross-sectional view of the vehicle front-back direction which shows the use condition of the airbag apparatus for passenger seats of 1st Embodiment which concerns on this invention. It is a perspective view at the time of inflating the airbag used for the airbag apparatus for passenger seats of 1st Embodiment alone. It is a figure explaining the state which manufactures the airbag used for 1st Embodiment from a bag raw material. It is a figure which shows the state at the time of the action | operation of the airbag apparatus for passenger seats of 1st Embodiment in order. It is a top view which shows the state at the time of the action | operation of the airbag apparatus for passenger seats of 1st Embodiment. It is a figure explaining the state which manufactures the airbag of the modification of 1st Embodiment from a bag raw material. It is a perspective view at the time of inflating the airbag shown in FIG. 6 alone. It is a schematic longitudinal cross-sectional view of the vehicle front-back direction which shows the state at the time of the action | operation of the airbag apparatus for passenger seats of 2nd Embodiment. It is the perspective view seen from the front side at the time of inflating the airbag used for the airbag apparatus for passenger seats of 2nd Embodiment alone. It is the perspective view seen from the back side at the time of inflating the airbag used for the airbag apparatus for passenger seats of 2nd Embodiment alone. It is a figure explaining the state which manufactures the airbag used for 2nd Embodiment from a bag raw material. It is a figure which shows the state at the time of the action | operation of the airbag apparatus for passenger seats of 2nd Embodiment in order. It is a top view which shows the state at the time of the action | operation of the airbag apparatus for passenger seats of 2nd Embodiment. It is a schematic longitudinal cross-sectional view of the vehicle front-back direction which shows the other state at the time of the action | operation of the airbag apparatus for passenger seats of 2nd Embodiment.

Explanation of symbols

1 ... (Instrument panel) Instrument panel,
3 ... Windshield,
5 ... Storage part,
20, 20A, 20B ... airbags,
20a ... (front of the airbag),
20b ... the rear of the airbag
20c ... at the bottom (of the airbag),
21 ... Lower expansion part,
21a ... (front expansion part) front part,
21d ... the lower surface (of the lower expansion part),
25. Upper expansion part,
26 ... Plate-shaped part,
30 ... Crew restraint surface,
31, 31L, 31R ... Shoulder restraint,
36 ・ 36A ・ 36B… Bag material,
37.38 ... the end,
40 ... bent portion,
41 / 41L / 41R ... communication part,
42, 42L, 42R ... Inflow suppression part,
44 · 44J · 44I · 54 · 54J · 54I ... Base fabric for bags,
45.55 ... through hole,
57.58 ... Tether,
P ... Crew,
S ・ SL ・ SR… Shoulder,
G ... expansion gas,
M1 and M2 ... Airbag devices for passenger seats.

Claims (6)

In operation, an inflating gas is introduced to expand and inflate rearwardly from the storage portion on the upper surface side of the instrument panel in front of the passenger seat, and between the upper surface of the instrument panel and the windshield above the instrument panel. The airbag is disposed so as to extend rearward with the gap between the two, and the airbag has an occupant restraint surface for receiving the occupant on the rear surface side when deployment and inflation is completed, and the occupant restraint surface is on both the left and right sides, respectively. An airbag device for a passenger seat that includes a shoulder restraint portion that extends along the vertical direction and is disposed so as to protrude rearward and that can restrain the left and right shoulder portions of an occupant,
The airbag is folded so that a bag-shaped bag material extending in a belt shape in the front-rear direction is stacked in the vertical direction, and both ends of the bag material are opposed to each other in the vertical direction at a position on the front side of the airbag. As a structure formed by combining,
The belt-shaped bag material is located on the lower side of the airbag and is located on the lower side of the inflation gas, and on the upper side of the airbag and located on the lower side of the inflation gas. And a portion arranged on both ends, and between the lower inflatable portion and the upper inflatable portion, arranged on the rear side of the airbag as a bent portion that is folded when the airbag is formed,
The bent portions of the bag material are arranged on both left and right sides so that the left and right shoulder restraining portions can be formed, and communication portions that are in communication with the lower inflating portion and the upper inflating portion and swell so as to extend in a bar shape in the vertical direction are arranged. For the passenger seat, wherein an inflow suppressing portion is provided between the left and right communication portions to suppress the inflow of the inflation gas and is recessed forward from the communication portion. Airbag device.   2. The airbag device for a passenger seat according to claim 1, wherein the bag material is formed by stacking two bag base fabrics having the same outer shape and joining the peripheral edges to each other.   The said inflow suppression part is made into the sheet form formed by combining the perimeters of the periphery of the said inflow suppression part at the time of the coupling | bonding of the two said base fabrics for bags. Airbag device for passenger seat.   The passenger seat airbag apparatus according to claim 2, wherein the inflow suppressing portion is configured to have a through-hole penetrating in the front-rear direction of the airbag when the inflation is completed.   2. The front passenger seat according to claim 1, wherein a portion of the bag material that is disposed on a front side of the airbag in the upper inflating portion is formed of a plate-like portion that does not allow inflation gas to flow. Air bag device.   The left and right communicating portions of the bag material extend forward and pass through the lower inflatable portion so as to be prevented from shaking in the left-right direction, and are connected to the lower surface on the front side of the lower inflatable portion. The airbag device for a passenger seat according to claim 1, comprising a tether.

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