JP2013209007A - Airbag for passenger seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airbag for a passenger seat capable of easily changing a volume in the completion of inflation.SOLUTION: An airbag 15 for a passenger seat includes a bag body 16 and a tether 32. The bag body 16 includes a passenger side wall 27 with a recess 28 and a circumferential wall 17, and the tether 32 includes a front side portion 33 at the circumferential wall 17 side and a rear side portion 37 at the passenger side wall 27 side. The front side portion 33 is configured of two sheets of a left sheet 34L and a right sheet 34R which are bifurcated from the front end of the rear side portion 33 where a rear end side is combined with the front end side of the recess 28, and the front end sides of the left sheet 34L and the right sheet 34R are combined with the left wall 20 and the right wall 21 of the circumferential wall 17, respectively by front side combining parts 41L, 41R. The front side combining parts 41L, 41R are arranged along an almost vertical direction in the completion of inflation of the bag body 16 and constitutes a volume adjusting part capable of adjusting a volume in the completion of inflation of the bag body 16 by changing length dimension.

Description

  The present invention is configured to be folded and housed in an instrument panel in front of a passenger seat of a vehicle, to have an expansion gas flowed into the interior, and to expand and expand to the rear side of the vehicle. And a tether that restricts the inflation completion shape of the bag body, and relates to a passenger seat airbag.

  Conventionally, as a passenger seat airbag having a configuration in which a tether is disposed inside a bag body, there has been a configuration shown below. The bag body is configured by denting the center in the left-right direction of the occupant side wall portion disposed on the rear end side at the time of completion of the inflation to the front side over substantially the entire upper and lower sides. And a tether that connects the gas inlet peripheral edge disposed in the vicinity of the front end when the expansion is completed. In this conventional passenger seat airbag, the tether is composed of two members, a front part located on the gas inlet side and a rear part located on the passenger side wall (for example, Patent Document 1).

  The tether disposed in the passenger seat airbag described in Patent Document 1 is for stably denting the recesses in the initial stage of inflation, but the front and rear portions of the bag body As an airbag in which a tether composed of two members is disposed, the front side portion is formed from two members so as to be bifurcated from the front end of the rear side portion, and when the inflation of the airbag is completed, the tether is Some have a configuration arranged in a substantially Y shape when viewed from the vertical direction side (see, for example, Patent Document 2).

JP 2008-254500 A JP 2007-314115 A (see FIG. 3)

  The airbag of Patent Document 2 is for a two-wheeled vehicle, and by disposing a substantially Y-shaped tether with the front side bifurcated inside the bag body, the passenger can be accommodated without increasing the volume. The purpose is to protect it properly. On the other hand, the required volume of the airbag for the passenger seat differs depending on the vehicle to be mounted, and it is necessary to change the design of the bag body for each vehicle. Therefore, from the viewpoint of cost reduction, there is room for improvement in that the bag body having the same shape can be diverted to a different type of vehicle.

  The present invention solves the above-described problems, and an object of the present invention is to provide a passenger seat airbag that can easily change the volume at the time of completion of inflation.

An airbag for a passenger seat according to the present invention is folded and stored in an instrument panel in front of a passenger seat of a vehicle, and has a bag body configured to expand and inflate to the rear side of the vehicle by flowing an inflation gas into the interior. ,
A tether disposed within the bag body to regulate the expansion completion shape of the bag body;
With
An occupant side wall portion that is disposed along a substantially vertical direction at the rear end side that becomes the occupant side at the time of completion of inflation, with the bag body having a shape at the time of completion of inflation as a substantially quadrangular pyramid shape with the top portion disposed on the front end side And a tapered peripheral wall portion that extends forward from the periphery of the occupant side wall portion and converges toward the front end side, so that the inflation gas can flow into the position near the front end when the inflation is completed A gas inlet that is open is arranged, and in the occupant side wall, a recess is provided at the approximate center in the left-right direction at the completion of the inflation so as to be recessed forward over substantially the entire upper and lower regions. A passenger airbag configured,
Each of the tethers is composed of a flexible sheet material, and includes a front part located on the peripheral wall part side, and a rear part located on the passenger side wall part side,
The rear part is configured by connecting the rear end side to the front end side of the recess in the bag body, and is arranged along the substantially front-rear direction when the expansion of the bag body is completed,
The front part is composed of two sheets of a left seat part and a right seat part having the same outer shape so that the front part branches bifurcated from the front end of the rear part. A left wall portion and a right wall portion that are configured to be coupled to the front end side and that are arranged so that the front end sides of the left seat portion and the right seat portion are opposed to each other on the peripheral wall portion at the time of completion of expansion of the bag body. Are combined to each other,
A front side coupling portion that couples the front end side of the left seat portion and the right seat portion to the left wall portion and the right wall portion, respectively, is formed in a linear shape, and is arranged substantially vertically when the bag body is completely inflated. In addition, the present invention is characterized in that a volume adjusting unit is configured that can adjust the volume of the bag body when the expansion is completed by changing the length dimension.

  In the passenger seat airbag according to the present invention, the tether disposed in the bag main body is bifurcated from the front end of the rear portion formed from the sheet material to the front portion disposed on the peripheral wall portion side. The left and right seat parts have the same outer shape, and the front end side of each of the left and right seat parts is divided into a left wall part and a right wall part of the peripheral wall part. Each is combined. That is, in the passenger seat airbag of the present invention, the tether is configured as a substantially Y shape when viewed from the vertical direction side when the inflating of the bag body is completed. In the passenger seat airbag according to the present invention, when the front side coupling portion that couples the front end side of each left seat portion and right seat portion to the left wall portion and the right wall portion is linear, when the inflation of the bag body is completed In the passenger seat airbag according to the present invention, the front side coupling portion has a volume adjustment capable of adjusting the volume at the completion of the inflation of the bag body by changing the length dimension. As a part.

  The tether arranged in the bag body regulates the separation distance between the left wall part and the right wall part in the bag body at the completion of the expansion at the front part (left seat part, right seat part), If the length of the front side coupling part that joins the left and right sheet parts to the left and right wall parts is increased, the area where the separation distance between the left and right wall parts can be reliably regulated is Therefore, in the cross section substantially along the vertical direction, the area that is curved in a spherical shape so that the left wall portion and the right wall portion protrude outward can be relatively reduced. The volume of the bag body at the completion of the expansion can be reduced. That is, in the passenger seat airbag according to the present invention, if the length dimension of the front coupling portion is increased without changing the shape of the panel constituting the occupant side wall portion and the peripheral wall portion of the bag body, The volume of the bag body can be increased when the inflation is completed by reducing the length of the front coupling portion.

  Furthermore, in the passenger seat airbag according to the present invention, the region where the left side wall portion and the front side coupling portion of the right wall portion of the bag body are disposed is prevented from being curved in a spherical shape so as to protrude outward. Therefore, if the length dimension of the front coupling part is increased, the height of the bag body at the time of completion of expansion can be increased with the volume reduced, and conversely the length dimension of the front coupling part. If the is reduced, the height of the bag body at the completion of the expansion can be lowered with the volume increased.

  Further, in the passenger seat airbag of the present invention, the rear side portion of the tether is configured by connecting the rear end side to the front end side of the recess disposed in the passenger side wall portion, and when the inflation of the bag body is completed, Since the configuration is arranged substantially along the front-rear direction, even when the length dimension of the front coupling portion is changed, the concave shape of the concave portion when the bag body is completely inflated can be maintained substantially constant. Furthermore, in the passenger seat airbag according to the present invention, the front portion of the tether is a region of the peripheral wall portion that is forwardly separated from the occupant side wall portion. Since the separation distance is restricted, the area of the occupant side wall portion that protects the occupant when the expansion of the bag body is completed is not easily affected by the change in the length dimension of the front coupling portion at the front portion of the tether, and is wide on the left and right. A protected area can be secured.

  Therefore, in the passenger seat airbag of the present invention, the volume at the time of completion of inflation can be easily changed, and can be easily transferred to different types of vehicles.

  Further, in the passenger seat airbag of the present invention, since the front portion of the tether connects the left wall portion and the right wall portion of the bag body, the bag body is attached to the left wall at the initial stage of inflation of the airbag. The left and right wall portions can be prevented from spreading widely to the left and right so that the occupant can be quickly received, and the occupant side wall portion Even when it is received, the front side portion of the tether can prevent the left wall portion and the right wall portion from being largely separated from each other, and the occupant can be accurately restrained by the occupant side wall portion.

Further, in the passenger seat airbag of the present invention, the length dimension of the front coupling part is set to be equal to or greater than the length dimension of the intermediate coupling part that couples the rear end side of the front part and the front end side of the rear part,
It is preferable to set the length dimension of the rear coupling part that couples the rear end side of the rear part to the front end side of the recess larger than the length dimension of the intermediate coupling part.

  When the passenger seat airbag is configured as described above, the front portion of the tether (on the left side) is set by setting the length of the intermediate joint that joins the rear end of the front portion and the front end of the rear portion to a certain extent. When the bag body is deployed and inflated, the bag body is arranged so as to divide the bag body in the front and back in a wide range up and down. The working gas can be rectified back and forth, and the occupant moving forward can be widely received vertically. In addition, by setting the length dimension of the rear coupling part for coupling the rear end side of the rear part to the front end side of the concave part larger than the length dimension of the intermediate coupling part, the depression of the concave part is completed when the expansion of the bag body is completed. The shape can be stably maintained over a wide range above and below, and the passenger can be protected softly.

  Further, in the passenger seat airbag having the above-described configuration, if the left seat portion and the right seat portion are each formed with a through hole, the rear side (occupant side wall) from the through hole at the initial stage of inflation of the airbag. A certain amount of inflation gas can be allowed to flow toward the part side), the region located on the rear side of the front portion of the tether in the bag body can be inflated to some extent, and an occupant can be received in the early stage of inflation. Even if it becomes, it can secure a cushioning property and can catch an occupant, which is preferable.

  Furthermore, in the passenger seat airbag having the above-described configuration, vent holes for exhausting excess inflation gas that has flowed into the bag body are provided on the front side of the left wall portion and the right wall portion when the bag body is completely inflated. If the structure is formed in the area behind the coupling part, the gas leakage from the vent hole is suppressed and the airbag can be quickly moved compared to the case where the vent hole is formed in the area in front of the front coupling part. It is preferable that it can be expanded. Further, in the passenger seat airbag having the above-described configuration, when the occupant seated at the normal position is restrained, excess inflation gas can be quickly exhausted from the vent hole. It becomes possible to protect softly by the part, which is preferable.

  Furthermore, in the passenger seat airbag having the above-described configuration, the occupant side wall portion includes a pair of left and right occupant side wall base fabrics that are curved in a substantially C shape, and the rear portion is the occupant side wall portion base fabric. If it is formed integrally with the occupant side wall base fabric so as to extend from the inner peripheral edge, the airbag can be formed with good yield, which is preferable.

It is sectional drawing along the vehicle front-back direction of the airbag apparatus for passenger seats using the airbag for passenger seats which is one Embodiment of this invention. It is the perspective view seen from the front side of the state where the airbag of the embodiment was inflated alone. It is sectional drawing along the front-back direction of the state which expanded the airbag of embodiment alone. It is sectional drawing of the state which expanded the airbag of embodiment alone, and respond | corresponds to the IV-IV site | part of FIG. It is sectional drawing of the state which expanded the airbag of embodiment alone, and respond | corresponds to the VV site | part of FIG. It is a top view which shows the base fabric which comprises the airbag of embodiment. It is the schematic which shows the manufacturing process of the airbag of embodiment. It is the schematic which shows the manufacturing process of the airbag of embodiment, and is a figure which shows the process after FIG. It is the schematic which shows the manufacturing process of the airbag of embodiment, and is a figure which shows the process after FIG. FIG. 4 is a schematic cross-sectional view in the left-right direction showing a state in which the airbag is completely inflated in the passenger airbag device using the airbag of the embodiment. 1 is a schematic cross-sectional view as seen from the side of a vehicle showing a state in which an airbag is completely inflated in a passenger seat airbag apparatus using an airbag according to an embodiment. It is the partial expanded longitudinal cross-sectional view of the state which each inflated the airbag which changed the length dimension of the front side connection part.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, an airbag for a passenger seat (hereinafter simply referred to as “airbag”) according to the embodiment includes an instrument panel (hereinafter referred to as “instrument panel”). (It is abbreviated as “instrument panel”) and is used for a top-mount type airbag device M for a passenger seat that is disposed inside the upper surface 2 of 1. As shown in FIG. 1, the passenger seat airbag apparatus M includes a folded airbag 15, an inflator 8 that supplies inflation gas to the airbag 15, and a case 5 that stores and holds the airbag 15 and the inflator 8. And the retainer 11 for attaching the airbag 15 and the inflator 8 to the case 5, and the airbag cover 10 covering the folded airbag 15.

  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 unless otherwise specified.

  The airbag cover 10 is formed integrally with the instrument panel 1 made of synthetic resin, and is configured so that the front and rear door portions 10a and 10b are pushed and opened by the airbag 15 when the airbag 15 is deployed and inflated. Has been. Further, a connecting wall portion 10 c connected to the case 5 is formed around the door portions 10 a and 10 b in the airbag cover 10.

  In the case of the embodiment, the inflator 8 is a cylinder type whose outer shape is substantially cylindrical with the axial direction substantially parallel to the left-right direction, as shown in FIG. In the embodiment, as the inflator 8, a dual type in which a large number of two types of gas discharge ports 8a and 8b capable of discharging the inflation gas at different timings are arranged on the outer peripheral surface is used (see FIG. 10). ). As shown in FIG. 10, the inflator 8 has both ends in the axial direction protruding from a lower chamber 7 to be described later in the case 5, and connectors (not shown) for connecting lead wires are arranged on both ends. Yes.

  In the case of the embodiment, as shown in FIGS. 1 and 10, the case 5 includes a substantially rectangular parallelepiped upper chamber 6 having an upper opening, and a lower portion disposed below the upper chamber 6 so as to communicate with the upper chamber 6. And a chamber 7. The upper chamber 6 includes a substantially square cylindrical peripheral wall portion 6a that locks the connecting wall portion 10c of the airbag cover 10, and a bottom wall portion 6b that extends inwardly from the front and rear edges on the lower end side of the peripheral wall portion 6a. , And is a part for storing the folded airbag 15 inside. An insertion hole (not shown) for inserting the bolt 11a of the retainer 11 is formed in the bottom wall portion 6b. The lower chamber 7 has a width dimension in the front / rear / left / right direction smaller than that of the upper chamber 6 and accommodates the inflator 8 therein, and is formed to extend downward from the inner peripheral edge of the bottom wall portion 6b in the upper chamber 6. In addition, both left and right end sides are configured so that both ends (end surfaces) of the inflator 8 are opened so as to be exposed. On the lower surface side of the lower chamber 7, a bracket (not shown) for attaching the case 5 to the vehicle body side is disposed.

  The retainer 11 has a substantially square ring shape, and is configured by bending the center side in the front-rear direction so as to protrude upward along the outer peripheral surface of the inflator 8. , Respectively, are provided with a plurality of bolts 11a (three in the case of the embodiment) protruding downward. In the case of the embodiment, the airbag 15 and the inflator 8 include the bolt 11 a of the retainer 11 disposed in the airbag 15, the peripheral edge of the gas inlet 23 in the airbag 15, and the bottom wall of the upper chamber 6 in the case 5. It is attached to the case 5 by passing through the portion 6b and stopping the nut 12. The inflator 8 is configured to be attached to the case 5 by being clamped from above and below by the lower chamber 7 of the case 5 and the retainer 11 when the bolt 11 a is fixed to the nut 12.

  The airbag 15 includes a bag main body 16 and a tether 32 that is disposed in the bag main body 16 and regulates the expansion completion shape of the bag main body 16.

  The bag body 16 has a substantially bag shape that can be disposed so as to close the space between the upper surface 2 of the instrument panel 1 and the windshield 4 above the instrument panel 1 when the inflation is completed, as shown in the two-dot chain line of FIG. 1 and FIG. It is configured. Specifically, as shown in FIGS. 2 to 5, the bag main body 16 has a substantially quadrangular pyramid shape with the top portion disposed on the front end side when the inflation is completed. And a tapered peripheral wall portion 17 that extends forward from the periphery of the occupant side wall portion 27 and converges toward the front end side.

  The peripheral wall portion 17 is a portion that is disposed so as to mainly close the space between the upper surface 2 of the instrument panel 1 and the windshield 4 above the instrument panel 1 when the airbag 15 is completely inflated. An upper wall portion 18 and a lower wall portion 19 that are disposed along the left and right sides, and a left wall portion 20 and a right wall portion 21 that are disposed substantially along the front-rear direction on both the left and right sides. In the vicinity of the front end of the lower wall portion 19 of the peripheral wall portion 17 that is near the front end of the bag body 16 when the inflation is completed, an opening is formed in a substantially rectangular shape so that inflation gas can flow into the inside at a central position on the left and right sides. A gas inflow port 23 whose periphery is attached to the bottom wall portion 6b of the case 5 is formed. A plurality of attachment holes 24 for attaching the bolt 11 a of the retainer 11 and attaching the periphery of the gas inlet 23 to the bottom wall portion 6 b of the case 5 are formed in the periphery of the gas inlet 23. A vent hole 25 for exhausting excess inflation gas flowing into the bag body 16 is formed in the left wall portion 20 and the right wall portion 21 of the peripheral wall portion 17. Specifically, the vent hole 25 is formed at a position behind the front coupling portions 41L and 41R that couple the front portion 33 of the tether 32 when the bag body 16 is completely inflated. More specifically, the vent hole 25 is formed in the left wall portion 20 and the right wall portion 21 at a position that is substantially in the center of the front and rear and upper and lower sides of the region behind the front coupling portions 41L and 41R.

  The occupant side wall 27 is disposed along the substantially vertical direction on the rear end side of the bag body 16 on the occupant MP side so as to face the occupant MP seated in the passenger seat when the expansion of the bag body 16 is completed. . The occupant side wall 27 is configured such that when the bag body 16 is inflated, a recess 28 is provided at a position that is substantially in the center in the left-right direction so as to be recessed forward over substantially the entire upper and lower regions. . And in the passenger | crew side wall part 27, the protrusion parts 29L and 29R which protrude relatively back are arrange | positioned at the both right and left sides of the recessed part 28. As shown in FIG. That is, on the occupant side wall 27 of the bag body 16 of the embodiment, when the expansion of the bag body 16 is completed, a recess 28 that is recessed at the center in the left-right direction, and protrusions 29L and 29R that are disposed on the left and right sides of the recess 28, Are continuously arranged along the vertical direction (see FIGS. 3 and 4). Specifically, in the case of the embodiment, the raised state of the left and right projecting portions 29L and 29R and the recessed state of the recessed portion 28 are substantially the same over substantially the entire upper and lower regions, and the upper and lower end sides are In the region of the wall portion 18 and the lower wall portion 19, the concave and convex portions are respectively converged toward the front. And in the bag main body 16 of embodiment, the front-end | tip (front end 28a) of the dent in the recessed part 28 is inner rim 49a, 50a of the inner left panel part 49 and inner right panel part 50 which are mentioned later as a passenger | crew side wall part base fabric mutually. The projecting top portions 29a of the projecting portions 29L and 29R are formed by a sewn portion 55 formed by sewing the outer left panel portion 46 and the outer right panel portion 47, which will be described later. The left panel portion 49 and the outer peripheral edges 49c and 50c of the inner right panel portion 50 are constituted by stitched portions 56L and 56R formed by sewing.

  The tether 32 disposed in the bag body 16 is composed of a flexible sheet material. As shown in FIGS. 3 and 4, the front side portion 33 located on the peripheral wall portion 17 side, and the occupant side wall And a rear portion 37 located on the portion 27 side. Specifically, the tether 32 includes a rear end 33b (34b) side of the front portion 33 where the front end 33a (34a) side is coupled to the region of the peripheral wall portion 17, and a rear end 37b side of the recess 28 in the occupant side wall portion 27. The front end 37a (38a) side of the rear part 37 joined to the front end 28a side is joined and arranged in the bag body 16, and the left side wall of the bag body 16 when the inflation is completed by the front part 33 The separation distance between the portion 20 and the right wall portion 21 is regulated, and the rear portion 37 prevents the occupant side wall portion 27 from projecting to the occupant side when the bag body 16 is deployed and inflated, and when the inflation is completed It is the structure which regulates so that the recessed part 28 may be dented stably in the passenger | crew side wall part 27 of this.

  The front portion 33 is composed of two sheets, a left seat portion 34L and a right seat portion 34R having the same outer shape, and the rear ends 34b of the left seat portion 34L and the right seat portion 34R are connected to the rear portion 37. The front end 37a (the front end 38a of the main body portion 38) is joined (sewn), and is bifurcated from the front end 37a of the rear portion 37. The left seat portion 34L and the right seat portion 34R constituting the front portion 33 are coupled to the left wall portion 20 and the right wall portion 21 of the peripheral wall portion 17 on the front end 34a side, respectively. In the case of the embodiment, the left-side seat portion 34L and the right-side seat portion 34R constituting the front side portion 33 have the same outer shape, and have a flat and substantially trapezoidal shape (in the up and down direction) widened from the front side so that the front edge side is the bottom side. The width W2 (see FIG. 6) on the rear end 34b side is substantially the same as the width dimension on the front end 37a side of the rear portion 37, and the width W1 on the front end 34a side (see FIG. 6). Is set to be larger than the width dimension W2 on the rear end 34b side. In the case of the embodiment, the width dimension W1 on the front end 34a side of the left sheet portion 34L and the right sheet portion 34R is set to about 1.5 times the width dimension W2 on the rear end 34b side. Further, a through hole 35 that is opened in a substantially circular shape is formed in each of the left seat portion 34L and the right seat portion 34R so that the inflation gas can be inserted therethrough.

  In the case of the embodiment, the rear portion 37 extends from the inner peripheral edge 50a of the inner right panel portion 50 constituting the region of the occupant side wall portion 27 in the bag body 16 and is integrated with the inner right panel portion 50 in the embodiment. By being configured, the rear end 37 b side is coupled to the front end 28 a of the recess 28 of the occupant side wall portion 27. Specifically, the rear portion 37 is formed so as to protrude from the inner peripheral edge 50a of the inner right panel portion 50, and the front end 38a side is coupled to the left seat portion 34L and the rear end 34b side of the right seat portion 34R. And a reinforcing piece 39 that extends downward from the main body 38 and is formed so as to be gradually reduced toward the inner peripheral edge 50a of the inner right panel 50. In the case of the embodiment, the rear portion 37 is formed so as to protrude from a vertically wide area excluding the upper and lower ends on the inner peripheral edge 50 a of the inner right panel portion 50. As shown in FIGS. 3 and 6, the main body 38 is arranged at a position above the center of the occupant side wall 27 (recessed portion 28), and the width of the front end 38 a is set to the left seat portion. 34L and the width dimension W2 on the rear end 34b side of the right seat portion 34R are substantially matched. The reinforcing piece portion 39 is disposed to prevent stress concentration in a region located below the main body portion 38 on the front end 28a side of the recess 28 when the airbag 15 is deployed and inflated.

  In the airbag 15 of the embodiment, the suture thread is formed so that the front side 34a side (the front end 33a side of the front side portion 33) of the left side seat portion 34L and the right side seat portion 34R forms the front side coupling portions 41L and 41R, respectively. Are sewn (coupled) to the left wall portion 20 and the right wall portion 21 of the peripheral wall portion 17, and the rear end 34b side (the rear end 33b side of the front portion 33) of the left seat portion 34L and the right seat portion 34R In a state where they are overlapped with each other, they are sewn (coupled) to the front end 38a side (the front end 37a side of the rear portion 37) of the main body portion 38 with a suture so as to form the intermediate coupling portion 42. Yes.

  The front coupling portions 41L and 41R are formed in a linear shape, and are arranged substantially in the vertical direction when the bag body 16 is completely inflated. In the case of the embodiment, the front coupling portions 41L and 41R are formed over the entire region in the width direction on the front end 34a side of the left side seat portion 34L and the right side seat portion 34R that constitute the front side portion 33. As shown in FIGS. 3 and 11, when the bag body 16 is completely inflated, it is arranged in a straight line with a slight inclination with respect to the vertical direction so that the upper end side is directed forward. Further, in the case of the embodiment, the front coupling portions 41L and 41R are arranged so as to be slightly forward of the front and rear centers of the left wall portion 20 and the right wall portion 21 and to be positioned slightly below the vertical center. In the state where the bag body 16 is mounted on the vehicle and the inflation is completed, the bag body 16 is disposed in a region in front of the rear end of the instrument panel 1 (see FIG. 11). In the airbag 15 of the embodiment, the lower ends of the front coupling portions 41L and 41R are not in direct contact with the instrument panel 1 and are located above the instrument panel 1 when the bag body 16 is completely inflated. In the airbag 15 of the embodiment, the upper ends of the front side coupling portions 41L and 41R are in a state where the left wall portion 20 and the outer left panel portion 46 and the outer right panel portion 47 constituting the right wall portion 21 are flatly deployed. The gas inlet 23 is disposed at a position slightly behind the center before and after the gas inlet 23 (see FIG. 6). More specifically, in the case of the embodiment, the length dimension L1 (see FIG. 6) of the front coupling portions 41L and 41R is determined from the left and right direction sides when the bag body 16 is mounted on the vehicle and the inflation is completed. In the projected state, the distance is set to about 5/9 of the separation distance D0 (see FIG. 11) between the instrument panel 1 and the windshield 4 on a straight line passing through the front coupling portions 41L and 41R. The front side coupling parts 41L and 41R constitute a volume adjusting part capable of adjusting the volume when the bag body 16 is completely inflated by changing the length dimension L1.

  In the embodiment, the intermediate coupling portion 42 is formed in a substantially straight shape over the entire region in the width direction on the rear end 34b side of the left seat portion 34L and the right seat portion 34R. In the case of the embodiment, when the bag body 16 is completely inflated, the intermediate coupling portion 42 is substantially parallel to the front coupling portions 41L and 41R as viewed from the left and right sides as shown in FIGS. It is arranged to be inclined with respect to the rear. In the airbag 15 of the embodiment, the intermediate coupling portion 42 is set to have a length dimension L2 (see FIG. 6) smaller than the length dimension L1 of the front coupling portions 41L and 41R. The length dimensions L1 and L2 of the front coupling portions 41L and 41R and the intermediate coupling portion 42 are substantially the same as the width dimensions W1 and W2 on the front end 34a side and the rear end 34b side of the left seat portion 34L and the right seat portion 34R, respectively. In the embodiment, the front side coupling portions 41L and 41R have the length dimension L1 set to about 1.5 times the length dimension L2 of the intermediate coupling portion 42.

  In the airbag 15 of the embodiment, the rear portion 37 of the tether 32 extends from the inner right panel portion 50 so as to extend from the inner peripheral edge 50a of the inner right panel portion 50 that constitutes the passenger side wall portion 27 of the bag body 16. The rear coupling portion 43 that is configured as a single unit and couples the rear end 37b side of the rear portion 37 to the front end 28a side of the concave portion 28 constitutes the front end (front end 28a) of the concave portion of the concave portion 28 in the embodiment. It is comprised from a part of the stitching | suture site | part 55 to do. Specifically, as shown in FIG. 6, the rear coupling portion 43 is configured such that the region behind the main body portion 38 is substantially linear and the region behind the reinforcing piece portion 39 is gently curved. The dimension L3 (see FIG. 6) is made larger than the length dimension L2 of the intermediate coupling part 42, and in the case of the embodiment, it is set to about 2.5 times the length dimension L2 of the intermediate coupling part 42.

  In the airbag 15 of the embodiment, the left seat portion 34L and the right seat portion 34R constituting the front portion 33 of the tether 32 have a width dimension W1 on the front end 34a side and a width dimension W2 on the rear end 34b side of about 1.5. The rear ends 34b and 34b are connected to each other as a flat and substantially trapezoidal shape set to double. Therefore, the front side portion 33 has an aspect in which the inner region of the bag body 16 is partitioned in the front and back in a wide range, and the left seat portion 34L and the right seat portion 34R constituting the front portion 33 are Since the front end 34a is coupled to a position slightly forward of the front and rear centers of the left wall portion 20 and the right wall portion 21 and slightly below the upper and lower centers, the airbag 15 is deployed. During inflation, the inflation gas G that has flowed into the interior from the gas inlet 23 can be rectified by the front portion 33 so as to flow upward and downward, so that the inflation gas directly flows into the passenger side wall. It can suppress going to the part 27 side. Note that when the inflation of the airbag 15 is completed, tension is generated in each of the left seat portion 34L and the right seat portion 34R constituting the front portion 33, so that the tether 32 is substantially Y-shaped when viewed from the vertical direction side. (See FIGS. 4 and 10).

  In the airbag 15 of the embodiment, the length dimension L1 of the front coupling portions 41L and 41R, the length dimension L2 of the intermediate coupling portion 42, and the length dimension L3 of the rear coupling portion 43 in the tether 32 are L1 ≧ L2. And it is preferable to set so that the relationship of L3> L2 may be satisfied. If the length dimension L2 of the intermediate coupling portion 42 is set to be large, the inner region of the bag body 16 is partitioned in the front and back in a wide range in the vertical direction, so that a high rectifying effect is obtained at the initial stage of inflation of the airbag 15. be able to. Further, if the length dimension L3 of the rear coupling portion 43 is set to be large, the concave portion 28 can be stably dented over a wide upper and lower range when the airbag 15 is completely inflated. Incidentally, although it is possible to set the length dimension L2 of the intermediate coupling portion 42 to be larger than the length dimension L1 of the front coupling portions 41L and 41R, if the length dimension L2 of the intermediate coupling portion 42 is increased, the air Since the manufacture of the bag 15 is not easy, it is preferable not to set the length dimension L2 of the intermediate coupling portion 42 larger than necessary.

  In the airbag 15 according to the embodiment, the length of the front portion 33 (the separation distance D1 between the front coupling portions 41L and 41R and the intermediate coupling portion 42, see FIG. 4) is adjusted to complete the inflation. The distance D3 between the left wall portion 20 and the right wall portion 21 of the bag body 16 (the width dimension DW in the left-right direction of the bag body 16 when inflation is completed, see FIG. 5) can be adjusted. By adjusting the length dimension of the side portion 37 (separation distance D2 between the intermediate coupling portion 42 and the rear coupling portion 43, see FIG. 4), the width dimension DL in the front-rear direction of the bag body 16 when the inflation is completed (Refer to FIG. 3) and the amount of recesses of the recesses 28 in the bag body 16 at the completion of inflation can be adjusted. Specifically, if the separation distance D1 between the front coupling portions 41L and 41R and the intermediate coupling portion 42 is set short, the gap between the left wall portion 20 and the right wall portion 21 of the bag body 16 at the completion of the inflation is set. The separation distance D3 can be shortened to reduce the width dimension DW in the left-right direction of the bag body 16 at the completion of the inflation. Further, if the separation distance D2 between the intermediate coupling portion 42 and the rear coupling portion 43 is set short, the width dimension DL in the front-rear direction of the bag body 16 at the completion of the inflation can be reduced, and the inflation is completed. The amount of depression of the recess 28 in the bag body 16 at the time can be increased.

  The bag body 16 is configured in a bag shape by joining the peripheral edges of a base fabric of a predetermined shape. In the case of the embodiment, as shown in FIG. The outer left panel portion 46, the outer right panel portion 47, and an inner left panel portion 49 and an inner right panel portion 50 that are disposed inward in the left-right direction when the expansion is completed are configured by four base fabrics.

  The outer left panel portion 46 and the outer right panel portion 47 are symmetrical, and in the bag body 16 when inflated, mainly the region of the peripheral wall portion 17 and the protrusions 29L and 29R of the occupant side wall portion 27. And a region of a portion that is outward in the left-right direction from the top portion 29a. More specifically, the outer left panel portion 46 and the outer right panel portion 47 include a region on the front side of the upper wall portion 18 in the peripheral wall portion 17, an entire area of the lower wall portion 19, the left wall portion 20, and the right wall portion 21, The occupant side wall portion 27 includes regions on the left and right sides of the protruding top portions 29a of the protruding portions 29L and 29R. These regions pass through the center of the gas inlet 23 and extend in the front-rear direction. In such a dividing plane, it is divided as left and right, and each is configured as a separate body.

  The inner left panel portion 49 and the inner right panel portion 50 constitute an inner region between the protruding top portions 29a of the protruding portions 29L and 29R in the occupant side wall portion 27. Specifically, the inner left panel portion 49 and the inner right panel portion 50 constitute a region from the rear side portion of the upper wall portion 18 to the portion of the occupant side wall portion 27 in the peripheral wall portion 17. At the position that becomes the front end (front end 28a) of the recess 28, it is divided into left and right, and the region from the front end 28a of the recess 28 to the protrusion top 29a of the left protrusion 29L, and the right protrusion from the front end 28a of the recess 28, respectively. A pair of left and right curved in a substantially C shape so as to constitute a region up to the protruding top portion 29a of the portion 29R. Each of the inner left panel portion 49 and the inner right panel portion 50 has a substantially strip shape in which the outer peripheral edges 49c and 50c and the inner peripheral edges 49a and 50a are respectively curved convexly toward the rear side. In the case of the embodiment, an extending portion 50 d that forms the rear portion 37 of the tether 32 is formed on the inner peripheral edge 50 a side of the inner right panel portion 50. In the case of the embodiment, the extended portion 50d is formed in a wide area excluding the upper and lower ends. In addition, the inner left panel 49 and the inner right panel 50 are flattened so that the outer peripheral edges 49c and 50c have curved shapes of the rear edges 46d and 47d of the outer left panel 46 and the outer right panel 47, respectively. It is comprised so that it may follow along.

  The bag body 16 of the embodiment is provided with three reinforcing cloths 52, 52, 53 that reinforce the peripheral edge of the gas inlet 23 (see FIGS. 3 and 4). As shown in FIG. 6, the reinforcing cloths 52 and 52 are arranged on the periphery of the gas inlet 23 in the bag body 16 as a substantially square ring. The reinforcing cloth 53 is disposed on the reinforcing cloths 52, 52 and includes an extending portion 53 a extending forward from the gas inflow port 23 as shown in FIG. 6. As shown in FIG. 3, the extending portion 53 a covers the inner peripheral side of the region on the front side of the stitched portion 57 extending from the front of the gas inlet 23, and when the airbag 15 is deployed and inflated, This prevents the inflation gas G flowing in from directly hitting the stitched portion 57.

  In the embodiment, the outer left panel portion 46, the outer right panel portion 47, the inner left panel portion 49, the inner right panel portion 50, the reinforcing cloths 52, 52, 53, and the front portion 33 of the tether 32 constituting the bag body 16. Each of the left sheet portion 34L and the right sheet portion 34R is formed of a flexible woven fabric made of polyester yarn, polyamide yarn, or the like. In the case of the embodiment, the bag body 16 and the tether 32 are made of a non-coated cloth that does not apply a coating agent such as silicon.

  Next, manufacture of the airbag 15 of embodiment is described. The inner left panel portion 49 and the inner right panel portion 50 are overlapped so that the outer peripheral edges 49c and 50c coincide with each other in a flatly developed state, and the inner peripheral edges 49a and 50a are sewn together using a suture thread. Then, a suture site 55 is formed (see B in FIG. 8).

  First, as shown in FIGS. 7A and 7B, in a state where the outer left panel portion 46 and the outer right panel portion 47 are flatly developed, the upper edge side is separated from each other, and the region on the lower end side is set. They are overlapped with each other, and the peripheral edges of the front and rear regions excluding the region where the gas inlet 23 is formed are sewn together using a suture. Specifically, in a state where the region on the lower end side of the outer left panel portion 46 is overlaid on the region on the lower end side of the outer right panel portion 47, a part of the lower edge 46a of the outer left panel portion 46 is The panel portion 47 is sewn, and a part of the lower edge 47a of the outer right panel portion 47 is sewn to the outer left panel portion 46. Next, as shown in FIG. 7B, the front left end 34a and the front end 34a side of the right seat 34R constituting the front portion 33 of the tether 32 are respectively connected to the outer left panel 46 and the outer right panel 47, respectively. Then, the front side coupling portions 41L and 41R are formed by sewing using a suture thread. Thereafter, as shown in FIG. 7C, the reinforcing cloths 52, 52, and 53 are sequentially stacked on the outer right panel portion 47, and are sewn using a suture thread at a peripheral portion of the gas inlet 23. Thereafter, the gas inlet 23 and the mounting hole 24 are formed by drilling (see A in FIG. 8).

  Next, as shown in FIG. 8B, the outer left panel portion 46 and the outer right panel portion 47 are overlapped so that their peripheral edges coincide with each other, and the upper front edges 46b and 47b are sewn together using a suture thread. Thus, a suture site 57 is formed. Thereafter, as shown in FIG. 8C, the outer left panel portion 46 and the outer right panel portion 47 are opened so that the upper rear edges 46c and 47c are separated from each other. The inner left panel portion 49 and the inner right panel portion 50 are opened so as to separate the front edges 49b and 50b, and the opened front edges 49b and 50b are opened to the outer left panel portion 46 and the upper rear edge 46c of the outer right panel portion 47. 47c, and as shown in FIG. 9A, the front edges 49b and 50b and the upper rear edges 46c and 47c are sewn using a suture thread. Thereafter, the rear edge 46d of the outer left panel portion 46 and the outer peripheral edge 49c of the inner left panel portion 49 are sewn using a suture to form a stitched portion 56L. The trailing edge 47d and the outer peripheral edge 50c of the inner right panel portion 50 are sewn using a suture thread to form a stitched portion 56R (see B in FIG. 9).

  Next, the rear end 34b of the left seat portion 34L and the right seat portion 34R and the front end 38a of the main body portion 38 of the rear portion 37 extending from the inner peripheral edge 50a of the inner right panel portion 50 are used with a suture. The intermediate coupling portion 42 is formed by sewing, and the tether 32 is formed. Then, if it reverses so that the seam allowance of an edge may not be exposed outside using gas inflow mouth 23, as shown to C of Drawing 9, air bag 15 can be manufactured.

  Then, after the airbag 15 is manufactured, the airbag 15 can be stored in the upper chamber 6 of the case 5 with the retainer 11 disposed therein so that the bolts 11 a protrude from the mounting holes 24. It is folded and wrapped around by a breakable wrapping material (not shown) for preventing collapse. Thereafter, the inflator 8 is stored in the lower chamber 7 of the case 5, and the folded airbag 15 is stored in the upper chamber 6 of the case 5 so that the bolt 11 a protrudes from the bottom wall portion 6 b of the upper chamber 6. . And if the nut 12 is fastened to each bolt 11a which protrudes from the bottom wall part 6b, the folded airbag 15 and the inflator 8 can be attached to the case 5.

  Thereafter, the peripheral wall portion 6a of the upper chamber 6 in the case 5 is connected to the connecting wall portion 10c of the airbag cover 10 in the instrument panel 1 mounted on the vehicle, and a predetermined bracket (not shown) provided on the case 5 is attached. If it is fixed to a member on the vehicle body side, the passenger seat airbag device M can be mounted on the vehicle.

  If the inflation gas is discharged from the gas outlets 8a, 8b of the inflator 8 after the front passenger airbag device M is mounted on the vehicle after the front passenger's airbag device M is mounted on the vehicle, the airbag 15 stores the inflation gas inside. The door 10a, 10b of the airbag cover 10 is pushed and opened as shown in the two-dot chain line of FIG. 1 and FIG. The airbag 15 protrudes upward from the case 5 through an opening formed by pushing and opening the door portions 10a and 10b of the airbag cover 10, and expands and inflates while protruding toward the rear side of the vehicle. As shown in the two-dot chain line in FIG. 1 and FIG. 11, the expansion is completed so as to close the space between the upper surface 2 of the instrument panel 1 and the wind seal 4 above the instrument panel 1.

  And in the airbag 15 of embodiment, the tether 32 arrange | positioned in the bag main body 16 has changed the front side site | part 33 arrange | positioned at the surrounding wall part 17 side from the front end 37a of the rear side site | part 37 formed from a sheet | seat material. In addition, the left and right seat portions 34L and 34R have the same outer shape so as to be branched. The left seat portion 34L and the front end 34a of the right seat portion 34R are connected to the peripheral wall portion. The 17 left wall part 20 and the right wall part 21 are connected to each other. That is, in the airbag 15 of the embodiment, as shown in FIG. 10, the tether 32 is configured as a substantially Y shape when viewed from the vertical direction when the bag body 16 is completely inflated. And in the airbag 15 of embodiment, the front side coupling | bond part 41L and 41R which couple | bond the front end 34a side of each left seat part 34L and the right seat part 34R with the left wall part 20 and the right wall part 21 are linear, As shown in FIG. 11, when the expansion of the bag main body 16 is completed, the bag body 16 is disposed substantially in the vertical direction. In the airbag 15 according to the embodiment, the front side coupling portions 41L and 41R are changed in the length dimension L1. In this way, the volume adjusting unit that can adjust the volume when the expansion of the bag body 16 is completed is provided.

  The tether 32 disposed in the bag main body 16 is formed between the left wall portion 20 and the right wall portion 21 of the bag main body 16 when the inflation is completed at the front portion 33 (left seat portion 34L, right seat portion 34R). If the separation distance D3 is restricted and the length dimension L1 of the front side coupling portions 41L and 41R for coupling the left seat portion 34L and the right seat portion 34R to the left wall portion 20 and the right wall portion 21 is increased, the left wall portion Since the region where the separation distance D3 between the right wall portion 20 and the right wall portion 21 can be reliably regulated becomes longer in the vertical direction, the left wall portion 20 and the right wall portion 21 in the cross section substantially along the vertical direction as shown in FIG. However, it is possible to relatively reduce the area curved in a spherical shape so as to protrude outward, and to reduce the volume of the bag body 16 when the inflation is completed. That is, in the airbag 15 of the embodiment, the panels (the outer left panel portion 46, the outer right panel portion 47, the inner left panel portion 49, the inner right panel portion 50) that constitute the occupant side wall portion 27 and the peripheral wall portion 17 of the bag body 16. If the length L1 of the front side coupling portions 41L and 41R is increased without changing the shape of the front side coupling portions 41L and 41R, the volume of the bag body 16 at the completion of the inflation can be reduced, and conversely, the front side coupling portions 41L and 41R. If the length L1 is reduced, the volume of the bag body 16 at the completion of the inflation can be increased.

  Further, in the airbag 15 according to the embodiment, the region where the front side coupling portions 41L and 41R of the left wall portion 20 and the right wall portion 21 of the bag body 16 are arranged is curved in a spherical shape so as to protrude outward. Therefore, it is possible to change the height DH (see FIG. 3) when the bag body 16 is completely inflated by changing the length dimension L1 of the front coupling portions 41L and 41R. Specifically, as shown in FIG. 12C, in the airbag 15A in which the length dimension of the front coupling portions 41LA and 41RA is set larger than that of the airbag 15 of the embodiment, the front coupling portions 41LA and 41RA Since the portion constituting the upper and lower regions is inflated with a relatively short membrane length and reduced lateral projection, this front side compared to the airbag 15 shown in FIG. The expansion is performed in a state where the volume of the region where the coupling portions 41LA and 41RA are disposed is reduced and the height at the time of completion of the expansion is increased. Conversely, as shown in FIG. 12B, in the airbag 15B in which the length dimension of the front coupling parts 41LB and 41RB is set smaller than that of the airbag 15 of the embodiment, the front coupling parts 41LB and 41RB are Since the portion constituting the lower region is inflated so as to protrude to the left and right with a relatively long membrane length, compared to the airbag 15 shown in FIG. , 41RB is expanded in a state where the volume of the region is increased and the height when expansion is completed is decreased. That is, in the airbag 15 of the embodiment, by changing the length dimension L1 of the front coupling portions 41L and 41R, particularly when the inflation is completed, the space between the upper surface 2 of the instrument panel 1 and the windshield 4 above the instrument panel 1 is changed. Since the height of the region of the peripheral wall portion 17 which is a portion disposed so as to be closed can be easily changed, depending on the inclination angle of the windshield 4, the separation distance between the windshield 4 and the instrument panel 1, etc. The height at the completion of the expansion of the part can be changed, and can be easily transferred to different types of vehicles.

  Further, in the airbag 15 of the embodiment, the rear portion 37 of the tether 32 is configured such that the rear end 37 b side is coupled to the front end 28 a side of the recess 28 disposed in the occupant side wall portion 27. When the expansion of the bag body 16 is completed, the concave portion 28 of the concave portion 28 at the completion of the expansion of the bag body 16 is formed even if the lengths of the front coupling portions 41L and 41R are changed. It can be maintained substantially constant. Furthermore, in the airbag 15 of the embodiment, the front side portion 33 of the tether 32 is a region of the peripheral wall portion 17 that is distant from the occupant side wall portion 27, and the left side wall portion 20 when the inflation is completed by the front side coupling portions 41L and 41R. Since the separation distance D3 between the bag body 16 and the right wall portion 21 is restricted, the region of the occupant side wall portion 27 that protects the occupant MP when the expansion of the bag body 16 is completed is the front side coupling portion 41L in the front side portion 33 of the tether 32. It is difficult to be affected by the change in the length dimension of 41R, and a wide protection area can be secured on the left and right.

  Therefore, in the airbag 15 of the embodiment, the volume at the completion of the inflation can be easily changed, and can be easily diverted to different types of vehicles.

  In the airbag 15 according to the embodiment, the front portion 33 of the tether 32 connects the left wall portion 20 and the right wall portion 21 of the bag body 16, so that the bag body is in the initial stage of inflation of the airbag 15. 16 can be prevented from spreading widely left and right so that the left wall portion 20 and the right wall portion 21 are largely separated from each other, so that the occupant MP can be received quickly, and the bag body 16 can be inflated. After completion, even when the occupant side wall 27 receives the occupant MP, the front side portion 33 of the tether 32 can prevent the left wall portion 20 and the right wall portion 21 from being separated greatly. The occupant MP can be restrained accurately.

  Furthermore, in the airbag 15 of the embodiment, the length dimension of the intermediate coupling portion 42 that couples the rear end 3b side of the front portion 33 and the front end 37a side of the rear portion 37 of the tether 32 is set to be somewhat large. Therefore, the front portion 33 (the left seat portion 34L and the right seat portion 34R) of the tether 32 is arranged so as to divide the bag body 16 into the front and back in a wide range up and down when the bag body 16 is expanded and inflated. The front portion 33 can rectify the expansion gas G expanded from the gas inflow port 23 back and forth, and can widely catch the occupant MP moving forward. Further, in the airbag 15 of the embodiment, the length dimension L3 of the rear side coupling portion 43 that couples the rear end 37b side of the rear portion 37 to the front end 28a side of the recess 28 is greater than the length dimension L2 of the intermediate coupling portion 42. Since the bag body 16 is set to be large, the concave shape of the concave portion 28 can be stably maintained over a wide range above and below when the expansion of the bag body 16 is completed, and the occupant MP can be protected softly. In the embodiment, the length dimension L2 of the intermediate coupling portion 42 is set to be smaller than the length dimension L1 of the front coupling portions 41L and 41R, but the length dimension L2 of the intermediate coupling portion 42 is the front coupling portion. You may set substantially the same as the length dimension L2 of 41L and 41R. In the embodiment, the length dimension L3 of the rear coupling part 43 is set larger than the length dimension L1 of the front coupling parts 41L and 41R, but the length dimension L1 of the front coupling parts 41L and 41R is: It may be set equal to or longer than the length dimension L3 of the rear coupling portion 43. Further, if the above points are not taken into consideration, the length dimension L2 of the intermediate coupling part 42 is set to be larger than the length dimension L1 of the front coupling parts 41L and 41R and the length dimension L3 of the rear coupling part 43. May be.

  In the airbag 15 according to the embodiment, the intermediate coupling portion 42 is disposed substantially in parallel to the front coupling portions 41L and 41R and is inclined so as to be rearwardly lowered with respect to the vertical direction when the airbag 15 is completely inflated. However, if the inclination of the intermediate coupling portion 42 with respect to the vertical direction is changed, the direction of the flow of the inflation gas G that is rectified by the front portion 33 and flows in the bag body 16 can also be adjusted. It is also possible to change the inclination of the intermediate coupling portion 42 with respect to the vertical direction.

  Furthermore, in the airbag 15 of the embodiment, since the through holes 35 are formed in the left seat portion 34L and the right seat portion 34R, respectively, at the initial stage of deployment of the airbag 15, the rear side from the through hole 35 is provided. A certain amount of inflation gas can be flowed toward the occupant side wall 27 side, and the region located on the rear side of the front portion 33 of the tether 32 in the bag body 16 can be inflated to some extent. Even if the occupant MP is received in the initial stage, the cushioning property can be secured and the occupant MP can be received. Of course, if such a point is not taken into consideration, the left seat portion and the right seat portion may have no through hole.

  Furthermore, in the airbag 15 according to the embodiment, the vent hole 25 for exhausting excess inflation gas that has flowed into the bag body 16 has the left wall portion 20 and the right wall portion when the bag body 16 is completely inflated. 21 is formed in a region behind the front coupling portions 41L and 41R, so that gas leakage from the vent hole is suppressed as compared with the case where the vent hole is formed in the region in front of the front coupling portion. Thus, the airbag 15 can be inflated quickly. In the airbag 15 of the embodiment, when the occupant MP seated at the normal position is restrained, excess inflation gas can be quickly exhausted from the vent hole 25. The side wall 27 can be softly protected. Of course, if such a point is not taken into consideration, the vent hole may be arranged in a region in front of the front coupling portion.

  Furthermore, in the airbag 15 of the embodiment, the inner peripheral edge of the inner right panel portion 50 in which the rear portion 37 of the tether 32 is curved into a substantially C shape as a passenger side wall portion base fabric constituting the passenger side wall portion 27. The inner right panel portion 50 is integrated with the inner right panel portion 50 so as to extend from 50a. Therefore, the airbag 15 can be formed with a high yield. Of course, if such a point is not taken into consideration, the rear portion may be configured separately from the inner right panel portion. In the airbag 15 of the embodiment, the rear part is configured only from the inner right panel part, but the rear part is extended from the inner peripheral edges of both the inner right panel part and the inner left panel part, You may comprise a back side site | part twice. Further, in the airbag 15 of the embodiment, the rear portion 37 is configured to include the reinforcing piece portion 39, but of course, the rear portion is configured only from the region of the main body portion and does not include the reinforcing piece portion. Also good.

  Moreover, in the airbag 15 of embodiment, although the front side coupling | bond part 41L, 41R is formed as substantially linear shape, the shape of a front side coupling | bond part is not restricted to this, You may be curvilinear. Furthermore, in the airbag 15 of the embodiment, when the inflation of the airbag 15 is completed, the front coupling portions 41L and 41R are configured to position the lower ends above the instrument panel 1, but the arrangement position of the front coupling portion is The position is not limited to this, and the lower end is substantially the same height as the instrument panel when the inflated airbag is viewed from the side so that the front coupling part directly contacts the instrument panel. You may comprise so that it may arrange | position.

  In the embodiment, the airbag used in the top-mount type passenger airbag device is described as an example, but the airbag for the passenger seat of the present invention is not limited to this, It can also be applied to a mid-mount type passenger-side airbag device.

15 ... Airbag (passenger seat airbag),
16 ... Bag body,
17 ... peripheral wall,
20 ... Left wall,
21 ... Right wall,
23. Gas inlet,
25 ... Benthole,
27: Passenger side wall,
28 ... recess,
28a ... front end,
32 ... Tether,
33 ... front part,
33a ... front end,
33b ... rear end,
34L ... left seat part,
34R ... right side seat,
35 ... through hole,
37 ... rear part,
37a ... front end,
37b ... rear end,
41L, 41R ... front coupling part,
42 ... intermediate joint,
43 ... rear side coupling part,
50 ... Inner right panel (occupant side wall fabric),
50a ... inner periphery,
MP ... Crew,
M ... Airbag device for passenger seat.

Claims (5)

A bag body configured to be folded and housed in an instrument panel in front of a passenger seat of the vehicle, and to expand and inflate into the rear side of the vehicle by flowing an inflation gas into the interior;
A tether disposed within the bag body to regulate the expansion completion shape of the bag body;
With
An occupant side wall that is disposed along the substantially vertical direction on the rear end side that becomes the occupant side when the inflating is completed, with the bag body having a substantially quadrangular pyramid shape with the top portion disposed on the front end side. And a tapered peripheral wall portion that extends forward from the periphery of the occupant side wall portion and converges toward the front end side, and in the position near the front end when the inflation is completed, the inflation gas is contained inside A gas inflow port that is open to allow inflow is arranged, and in the occupant side wall portion, a concave portion that is recessed in the front side over substantially the entire upper and lower sides at a substantially central position in the left-right direction when the inflation is completed, An airbag for a passenger seat configured to be disposed;
Each of the tethers is composed of a flexible sheet material, and includes a front part located on the peripheral wall part side and a rear part located on the passenger side wall part side. ,
The rear portion is configured by connecting the rear end side to the front end side of the concave portion in the bag body, and is arranged along the front-rear direction when the expansion of the bag body is completed,
The front part is composed of two sheets of a left seat part and a right seat part having the same outer shape so that the front part is bifurcated from the front end of the rear part. A left side that is configured to be coupled to the front end side of the side part, and that is arranged so that the front end side of the left seat part and the right seat part are opposed to each other at the peripheral wall part at the time of completion of expansion of the bag body. The wall part and the right wall part are combined with each other,
A front side coupling portion that couples the front end side of the left seat portion and the right seat portion to the left wall portion and the right wall portion, respectively, is formed in a linear shape, and when the bag body is completely inflated, A passenger seat airbag characterized by comprising a volume adjusting section that is arranged along the direction and that can adjust the volume of the bag main body when inflation is completed by changing the length dimension. The length dimension of the front coupling part is set to be equal to or greater than the length dimension of the intermediate coupling part that couples the rear end side of the front part and the front end side of the rear part,
The length dimension of the rear side coupling part that couples the rear end side of the rear part to the front end side of the recess is set larger than the length dimension of the intermediate coupling part. The passenger airbag described.   The passenger seat airbag according to claim 1 or 2, wherein a through hole is formed in each of the left seat portion and the right seat portion.   A vent hole for exhausting excess inflation gas that has flowed into the bag body is located in a region behind the front coupling portion in the left wall portion and the right wall portion when the expansion of the bag body is completed. The passenger-side airbag according to any one of claims 1 to 3, wherein the passenger-side airbag is formed. The occupant side wall portion includes a pair of left and right occupant side wall base fabrics that are curved in a substantially C shape,
The said back side site | part is comprised integrally with the said base material for passenger | crew side wall parts so that it may extend from the inner periphery of the said base fabric for passenger | crew side wall parts, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. Air bag for passenger seat as described in 1.

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