JP6347185B2 - Airbag device for passenger seat - Google Patents

Description

  The present invention is folded and stored in a storage part provided in an instrument panel arranged in front of a passenger seated in a passenger seat, and inflated with gas flowing inside to protrude toward the rear side of the vehicle. The present invention relates to an airbag device for a passenger seat that includes an airbag that is inflated to protect an occupant.

  Conventionally, as an airbag device disposed in front of a passenger seat, when the airbag is inflated, the passenger seat protector for protecting the passenger seated in the passenger seat, and the passenger seat protector for the passenger seat There is a configuration including a central occupant protection unit for protecting a central occupant that projects inward and sits on a seat between a driver seat and a passenger seat (see, for example, Patent Document 1). )

JP-A-6-72275 (FIG. 6)

  However, in this conventional airbag device, the central occupant protection part is for protecting the central occupant seated on the central seat between the driver's seat and the passenger seat, and the rear side when the inflation is completed, It was almost flush with the rear side when the passenger seat protection part was inflated. That is, in this conventional airbag device, when the driver seated in the driver's seat or the occupant seated in the front passenger seat moves diagonally forward, which is the central side in the left-right direction, at the time of the oblique collision or offset collision of the vehicle. The driver and crew were not properly protected.

  The present invention solves the above-described problems, and provides an airbag device for a passenger seat that can accurately protect a driver seated in a driver seat moving diagonally forward and a passenger seated in the passenger seat. The purpose is to do.

An airbag device for a passenger seat according to the present invention is folded and stored in a storage portion provided in an instrument panel disposed in front of an occupant seated in a passenger seat, and an inflating gas is caused to flow into the rear of the vehicle An airbag device for a passenger seat, comprising an airbag that is inflated so as to protrude toward the side and is configured to protect an occupant,
The airbag is configured as an occupant protection part capable of protecting the occupant on the rear side when the inflation is completed,
The passenger protection department
Front restraint restraint surface capable of protecting the head of an occupant moving forward during a vehicle front impact,
When the expansion is completed, the vehicle is disposed at the center side in the left-right direction of the vehicle so as to protrude rearward from the front collision restraint surface. A protruding inflatable part configured to protect the head of an occupant who sometimes moves diagonally forward on the driver's seat side;
And is configured to include
The projecting and inflating portion is configured to project the rear end side when the inflation is completed to the rear of the steering wheel airbag that is inflated so as to cover the steering wheel in front of the driver's seat. By the side surface arranged on the side, the head of the driver who moves toward the front diagonally on the passenger seat side at the time of the diagonal collision or offset collision can be protected,
The airbag is characterized in that an overhanging inflating portion that projects so as to be disposed in front of the steering wheel is disposed in a region in front of the projecting inflating portion when the inflation is completed.

  In the passenger seat airbag device according to the present invention, the airbag includes a projecting inflating portion disposed so as to project rearward from the front restraint restraining surface on the center side in the left-right direction of the vehicle when the inflation is completed. This projecting and expanding portion is a head of an occupant that moves obliquely forward on the driver's seat side at the time of an oblique collision or an offset collision of the vehicle by a side surface arranged on the front collision restraint surface side when the expansion is completed. Can be protected, and the side of the driver's side that is placed on the driver's seat when inflation is complete can protect the driver's head that moves diagonally forward on the passenger's side in the event of an oblique or offset collision. It is configured. For this reason, when an occupant seated in the passenger seat or a driver seated in the driver's seat moves toward the diagonally forward side, which is the center side in the left-right direction and forward, at the time of a diagonal collision or offset collision of the vehicle. Further, the driver's head can be accurately protected by the side surface of the projecting and expanding portion. In the airbag device for a passenger seat according to the present invention, the overhanging inflating portion that protrudes so as to be disposed in front of the steering wheel is disposed in a region on the front side of the inflating portion when the inflation is completed. Therefore, even if the driver who moves diagonally forward causes the head to enter the gap between the steering wheel airbag and the protruding inflating part, The driver can accurately catch the driver's head.

  Therefore, in the passenger seat airbag device of the present invention, the driver seated in the driver seat moving obliquely forward and the passenger seated in the passenger seat can be protected accurately.

  In the airbag device for a passenger seat according to the present invention, the overhanging inflation portion of the airbag extends obliquely forward in a substantially straight line from the side of the protruding inflation portion on the driver's seat side when viewed from above. If the configuration is arranged so as to reach the region on the front side of the vehicle, the rear surface side portion when the expansion of the overhanging expansion portion is completed with respect to the driver's head moving diagonally forward It is preferable that the driver can be arranged in a face-to-face relationship and can receive the driver's head at a wide planar portion.

1 is a schematic cross-sectional view illustrating a state in which a passenger seat airbag device according to an embodiment of the present invention is mounted on a vehicle. 1 is a schematic plan view of a state in which a passenger seat airbag device of an embodiment is mounted on a vehicle. 1 is a schematic front view of a state in which a passenger seat airbag device of an embodiment is mounted on a vehicle. It is the perspective view of the state seen from the back left which shows the state which expanded the airbag used with the airbag apparatus for passenger seats of embodiment alone. It is a schematic longitudinal cross-sectional view of the airbag of FIG. It is a schematic cross-sectional view of the airbag of FIG. It is sectional drawing which shows the VII-VII site | part of FIG. It is sectional drawing which shows the VIII-VIII site | part of FIG. It is a top view which shows the base fabric which comprises the airbag of embodiment. It is a top view which shows the base fabric which comprises the airbag of embodiment. It is the schematic explaining the process of manufacturing the airbag of embodiment. It is the schematic explaining the process of manufacturing the airbag of embodiment, and shows the process after FIG. It is the schematic explaining the process of manufacturing the airbag of embodiment, and shows the process after FIG. It is the schematic explaining the process of manufacturing the airbag of embodiment, and shows the process after FIG. It is the schematic explaining the process of manufacturing the airbag of embodiment, and shows the process after FIG. FIG. 3 is a schematic front view of the passenger seat airbag device according to the embodiment in a state in which the airbag is completely inflated. FIG. 3 is a schematic plan view of the passenger seat airbag device according to the embodiment in a state in which the airbag is completely inflated. FIG. 3 is a schematic plan view showing a state in which the driver's head moving diagonally forward is received when the airbag is completely inflated in the passenger seat airbag device of the embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the passenger seat airbag apparatus M according to the embodiment is located in front of the passenger seat PS in the vehicle V and inside the upper surface 2 of the instrument panel (hereinafter abbreviated as “instrument panel”) 1. It is a top mount type to be arranged. In the embodiment, the front-rear, up-down, left-right directions are the same as the front-rear, up-down, left-right directions of the vehicle V unless otherwise specified.

  As shown in FIG. 1, the passenger seat airbag apparatus M according to the embodiment includes a folded airbag 15, two inflators 8 and 8 that supply inflation gas to the airbag 15, and the airbag 15 and the inflator. A case 12 as a storage part for storing and holding 8, a retainer 9, 9 for attaching the airbag 15 and the inflator 8 to the case 12, an airbag cover 6 covering the folded airbag 15, and It is configured with.

  The airbag cover 6 is formed integrally with the instrument panel 1 made of synthetic resin, and when the airbag 15 is deployed and inflated, the front and rear door portions 6a and 6b are pushed by the airbag 15 and opened. It is configured. Further, a connecting wall portion 6 c connected to the case 12 is formed around the door portions 6 a and 6 b in the airbag cover 6.

  In the case of the embodiment, the two inflators 8 are arranged side by side in the left-right direction as shown in FIG. As shown in FIG. 1, each inflator 8 includes a substantially cylindrical main body portion 8 a having a plurality of gas discharge ports 8 b and a flange portion 8 c for attaching the inflator 8 to the case 12. Yes. In the case of the embodiment, each inflator 8 is configured to operate during frontal collision, oblique collision, and offset collision of the vehicle V.

  The case 12 as a storage part is formed in a substantially rectangular parallelepiped shape made of a sheet metal having a rectangular opening on the upper end side, and a bottom wall portion 12a having a substantially rectangular plate shape to which each inflator 8 is inserted and attached from below, And a peripheral wall portion 12b extending upward from the outer peripheral edge of the wall portion 12a and locking the connection wall portion 6c of the airbag cover 6. In the case of the embodiment, the airbag 15 and each inflator 8 are attached to the bolts 9a of the retainers 9 disposed in the airbag 15 as attachment means, the periphery of the gas inlet 20 in the airbag 15, and the bottom of the case 12 The wall portion 12 a and the flange portion 8 c of the inflator 8 are passed through and fixed to the bottom wall portion 12 a of the case 12 by being fastened with a nut 10. A bracket (not shown) connected to the body side of the vehicle V is disposed on the bottom wall portion 12a of the case 12.

  In the case of the embodiment, as shown in FIGS. 4 to 6, the airbag 15 is inflated by introducing an inflating gas into the airbag 15, and the airbag body 16 is disposed in the bag body 16 and the bag body 16 is inflated completely. Tethers 37, 41, and 42, and an outer tether 44 that connects the front end side of the bag body 16 when the bag body 16 is inflated to the case 12 side.

  The bag body 16 is a bag formed from a flexible sheet body. In the case of the embodiment, as shown in FIGS. And a projecting and expanding part 32 disposed so as to project rearward from the rear surface side of the expanding part 17. Further, the bag body 16 is configured as an occupant protection portion 29 that can protect the occupant MP seated on the passenger seat PS on the rear surface side when the inflation is completed. As shown in FIG. 6, the occupant protection unit 29 is configured to include a front-projection restraint surface 30 and a projecting inflating portion 32 that is arranged to project rearward from the front-projection restraint surface 30. .

  The main body inflating portion 17 is configured to 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 expansion is completed. 12 is provided so as to protrude greatly to the left side on the driver's seat DS side when expansion is completed (see FIGS. 16 and 17). The main body inflatable portion 17 extends rearward from the rear side wall portion 27 disposed on the rear surface side that is the occupant MP side when the inflating is completed, and extends from the periphery of the rear side wall portion 27 to the front end side so as to reduce the vertical width dimension toward the front end side. And a tapered peripheral wall portion 18 that converges on the outer periphery.

  The peripheral wall portion 18 is a portion that is disposed so as to mainly block 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. It includes a portion 18a, a lower wall portion 18b, and a left wall portion 18c and a right wall portion 18d disposed on the left and right sides. An attachment portion 19 for attaching the airbag 15 to the case 12 is partially forward of the portion on the right front end side when the inflation is completed in the peripheral wall portion 18 in a state where the airbag 15 is inflated alone. It is formed so as to protrude (see FIGS. 4 and 6). The attachment portion 19 is a part disposed in the case 12 when the inflation of the airbag 15 is completed. The attachment portion 19 is substantially arranged so that inflation gas can flow into the lower surface side (lower wall portion 18b side) when the inflation is completed. Two gas inflow ports 20 having a circular opening and having a peripheral edge attached to the bottom wall portion 12a of the case 12 are arranged side by side along the left-right direction (see FIG. 6). Four attachment holes 21 through which the bolts 9a of the retainer 9 are inserted are formed on the periphery of each gas inlet 20 respectively. In this airbag 15, as shown in FIGS. 6 and 17, the central portion between the centers of the gas inlets 20 (the center in the left-right direction of the mounting portion 19) is defined as the mounting center C1, and this mounting center C1 is an assistant. It is mounted on the vehicle V so as to coincide with the center of the seat PS in the left-right direction. A vent hole 23 is formed in the left wall portion 18c and the right wall portion 18d of the peripheral wall portion 18.

Further, in the main body inflating portion 17 in the airbag 15 of the embodiment, the steering wheel 70 disposed in front of the driver seat DS is located in the region of the left wall portion 18c that is the region on the front side of the protruding inflating portion 32 when the inflation is completed. An overhanging expansion portion 25 protruding leftward is formed so as to be disposed in the front. That is, the overhanging expansion portion 25 is configured integrally with the main body expansion portion 17. Further , as shown in FIGS. 4, 6, and 8 , the overhanging and expanding portion 25 is formed to project in a substantially triangular pyramid shape as a tapered shape that converges toward the tip 25 a side in the region of the left wall portion 18 c. ing. In the case of the embodiment, the overhanging expansion portion 25 is arranged so as to continue from the upper wall portion 18a and converges toward the left side, and is arranged so as to continue from the lower wall portion 18b and to the left side. A lower wall 25c that converges toward the left side, and a rear wall 25d that is arranged so as to continue from a left wall portion 32c, which will be described later, of the projecting and expanding portion 32 and converges toward the left side. The outer shape is a substantially triangular pyramid shape that is converged over. Specifically, the overhanging inflation portion 25 is configured so that the distal end 25a is disposed in the vicinity of the boss portion 71 beyond the ring portion 72 of the steering wheel 70 when the inflation of the airbag 15 is completed (see FIG. 16, 17). Further, in the overhanging inflating portion 25, the rear wall 25d on the rear surface side when the inflation is completed is, as shown in FIG. It is arranged so as to extend obliquely forward in a substantially straight line from 32c (side surface on the driver's seat DS side) and reach a region on the front side of the steering wheel 70. That is, when the inflation of the airbag 15 is completed, a portion on the tip 25a side of the overhanging inflation portion 25 includes a steering wheel airbag 74 (described later) that inflates so as to cover the upper surface (rear surface) of the steering wheel 70, and the front and rear They are arranged overlapping on the direction side (see FIG. 16).

  The rear side wall portion 27 is disposed so as to be substantially along the vertical direction on the rear surface side that is the occupant MP side when the airbag 15 is inflated. In the case of the embodiment, in detail, the rear side wall portion 27 is disposed so as to be slightly inclined downwardly with respect to the vertical direction when the airbag 15 is completely inflated (see FIG. 5). Further, the rear side wall portion 27 is arranged so as to be substantially along the left-right direction in the cross section along the front-rear direction when the airbag 15 is completely inflated. A portion that intersects the center line CL1 along the direction (a connecting portion of the front and rear tethers 37 to be described later) is positioned on the farthest rear side, and is curved on the left and right side so that the left and right ends are directed frontward. (See FIG. 6). In the airbag 15 of the embodiment, the upper region of the rear side wall portion 27 constitutes the front collision restraint surface 30 in the occupant protection portion 29. The front collision restraint surface 30 can protect the head MH of the occupant MP that moves forward during the front collision of the vehicle V. Specifically, the front collision restraining surface 30 is disposed on the right side of the protruding inflating portion 32 when the expansion is completed. It consists of areas. The front collision restraint surface 30 includes an area extending to the left side (driver's seat DS side) beyond the center line CL1 along the front-rear direction passing through the attachment center C1, and the occupant MP moving forward during the front collision of the vehicle V. The head MH can be protected without hindrance. Further, when the airbag 75 is completely inflated, the front collision restraint surface 30 is slightly curved in the left-right direction so that the portion near the center line CL1 is located on the rear side and the left and right ends are directed frontward. (See FIG. 6).

  The protruding inflatable portion 32 is arranged so as to protrude rearward from the rear side wall portion 27 (the front impact restraining surface 30) when the airbag 15 is inflated. In the case of the embodiment, in the rear side wall portion 27, It is formed in the upper left part when the expansion is completed. The protruding inflatable portion 32 is disposed at a position that is an obliquely left front of the head MH of the occupant MP seated on the passenger seat PS (an obliquely forward on the driver seat DS side) when the inflation of the airbag 15 is completed. (See FIG. 17). In the case of the embodiment, the projecting and expanding portion 32 has a communication hole portion 34 (see FIG. 6) formed so as to penetrate the rear wall portion 27 and the front wall portion 32 e of the projecting and expanding portion 32 on the front end side when expansion is completed. 7), the expansion gas is introduced into the main body expansion portion 17 from the main body expansion portion 17 through the communication hole portion 34. The projecting and expanding portion 32 has a substantially rectangular parallelepiped shape, and includes an upper wall portion 32a and a lower wall portion 32b that are arranged along the left and right sides on both the upper and lower sides, and a substantially front and rear direction on both the left and right sides. Left wall portion 32c and right wall portion 32d, and front wall portion 32e and rear wall portion 32f that are disposed substantially along the left-right direction on both front and rear sides. As shown in FIG. 7, the projecting and expanding portion 32 is formed by sewing the front wall portion 32 e to the rear side wall portion 27 over the entire periphery at the outer portion 35 a in the peripheral portion 35 of the communication hole portion 34. It is connected to. Further, as shown in FIG. 6, the protruding inflating portion 32 does not straddle the center line CL <b> 1 along the front-rear direction passing through the attachment center C <b> 1 in the cross section along the front-rear direction when the airbag 15 is inflated. It is formed in a region on the left side (driver's seat DS side) from the center line CL1. In the case of the embodiment, the protruding inflatable portion 32 has a width dimension on the left and right side at the time of completion of expansion set to about 1/3 of a width dimension on the left and right side at the time of completion of expansion of the main body inflating portion 17 The width dimension on the vertical direction side is set to about 3/5 of the width dimension on the vertical direction side when the expansion of the portion near the rear side wall portion 27 in the main body expansion portion 17 is completed. In addition, the projecting and inflating portion 32 is configured to project the rear end side (rear wall portion 32 f) at the time of completion of inflation more rearward than the steering wheel airbag 74 that has been inflated. Further, since the airbag 15 is inflated so as to curve the rear side wall portion 27, the protruding inflatable portion 32 attached to the rear side wall portion 27 directs the right side to the rear side when the inflation of the airbag 15 is completed. In addition, they are arranged to be inclined with respect to the left-right direction (see FIG. 6).

  Further, the protruding inflating portion 32 is obliquely forward (leftward) on the driver's seat DS side at the time of the diagonal collision of the vehicle V or the offset collision by the right wall portion 32d disposed on the front collision restraint surface 30 side (right side) when the expansion is completed. The head MH of the occupant MP moving obliquely forward is configured to be protected. As shown in FIG. 6, the right wall portion 32 d is configured so that the vicinity of the crossing portion (front end side portion) with the rear side wall portion 27 (the front collision restraining surface 30) is connected to the rear side wall portion 27 gently. It is configured to be curved. Further, the protruding inflating portion 32 is obliquely forward (diagonally forward right) on the passenger seat PS side at the time of an oblique collision or an offset collision of the vehicle V due to the left wall portion 32c disposed on the driver's seat DS side (left side) when the inflation is completed. The head MH of the driver MD that moves toward the vehicle can be protected. As described above, when the inflation of the airbag 15 is completed, the protruding inflatable portion 32 is disposed to be inclined with respect to the left-right direction so that the right side is directed to the rear side. Therefore, the left wall portion 32c and the right wall portion 32d are In this case, the rear side is inclined with respect to the front-rear direction so as to be directed leftward (see FIG. 6).

  In the case of the embodiment, three tethers 37, 41, and 42 are arranged in the bag body 16 as shown in FIGS. Specifically, in the bag main body 16, the front and rear tethers 37 are arranged so as to connect the vicinity of the gas inlet 20 in the main body inflating portion 17 and the rear side wall portion 27, and the protruding inflating portion 32. The upper and lower tethers 41 and the regulation tether 42 are arranged.

  In the embodiment, the front / rear tether 37 is disposed so as to be positioned on the center line CL1 along the front / rear direction passing through the attachment center C1 when the airbag 15 is completely inflated (see FIG. 6). The front portion 38 extending from the peripheral edge of the inlet 20 and the rear portion 39 extending from the rear side wall portion 27 are connected to each other.

  In the case of the embodiment, the front side portion 38 is configured by folding the front side portion material 63 shown in FIG. 9, and has an outer shape at the time when the expansion of the bag body 16 is completed as a bilaterally symmetric shape around the attachment center C <b> 1. Is a three-dimensional shape approximating a substantially triangular pyramid shape with the front end side extending substantially in the horizontal direction and the rear end side extending substantially in the vertical direction. In the case of the embodiment, as shown in FIGS. 5 and 6, the front portion 38 has a region on the front end side as a connecting portion 38 a to the bag body 16, the connecting portion 38 a, the gas inlet 20 and the attachment hole 21. Corresponding openings (not shown) are arranged, and are sewn to the lower wall portion 18b over the entire circumference at the peripheral portion of the gas inlet 20. A region extending rearward from the gas inlet 20 in the front portion 38 constitutes a main body portion 38b, and the outer shape of the main body portion 38b has a three-dimensional shape that approximates a substantially triangular pyramid shape. The main body portion 38b is configured so that the upper and lower width dimensions of the rear end portion 38c side portion sewn on the front end 39a side of the rear side portion 39 substantially coincide with the upper and lower width dimensions of the rear portion 39 on the front end 39a side. It is configured.

  In the case of the embodiment, the rear portion 39 extends in the form of a sheet from the rear left panel 56 and the inner peripheral edges 56 c of the rear right panel 58 constituting the rear side wall portion 27 of the main body inflating portion 17, and the rear left panel 56. , And extending portions 56d and 58d configured integrally with the rear right panel 58 (see FIGS. 5 and 6). In other words, the rear portion 39 is formed as a two-layered structure integrally with the rear left panel 56 and the rear right panel 58, respectively. Specifically, in the case of the embodiment, the rear portion 39 has a narrow width on the front end 39a side connected to the front portion 38, and the regions on the rear end side are the rear left panel 56 and the inner peripheral edge 56c of the rear right panel 58. , 58c, and a substantially trapezoidal shape that expands vertically. The front and rear tether 37 regulates the separation distance from the peripheral portion of the gas inlet 20 of the rear side wall 27 when the inflation of the airbag 15 is completed, so that the rear side wall 27 is placed on the occupant MP side in the initial stage of inflation of the airbag 15. It arrange | positions in order to suppress protruding largely backwards.

  The upper and lower tethers 41 are arranged substantially along the vertical direction so as to connect the upper wall portion 32a and the lower wall portion 32b of the protruding inflatable portion 32 (see FIG. 7). In the case of the embodiment, the upper and lower tethers 41 are formed in a strip shape that is arranged so as to connect the approximate center of the upper wall portion 32a and the approximate center of the lower wall portion 32b when the airbag 15 is completely inflated. Two tether base fabrics 41a and 41b arranged side by side in the up-down direction side are coupled to each other. The upper and lower tethers 41 are disposed in order to regulate the inflated shape of the protruding inflatable portion when the airbag 15 is inflated.

  The restriction tether 42 is disposed so as to be inclined with respect to the front-rear direction so as to connect the front wall portion 32e and the right wall portion 32d of the projecting and expanding portion 32 (see FIG. 6). In the case of the embodiment, the restriction tether 42 is disposed so as to connect the approximate left and right centers of the front wall portion 32e and the approximate center before and after the right wall portion 32d when the airbag 15 is completely inflated. The front end side is sewn to the inner part 35b of the peripheral part 35 between the openings 34a, 34a arranged side by side in the left-right direction of the communication hole part 34 in the front wall part 32e. The regulation tether 42 is configured by joining two tether base fabrics 42a and 42b arranged side by side in the front-rear direction. The restriction tether 42 is disposed to restrict the curved shape of the front wall side of the right wall portion 32d in the protruding inflatable portion 32 when the airbag 15 is completely inflated.

  In the embodiment, the outer tether 44 that connects the front edge side of the bag body 16 when the inflation is completed to the case 12 side, as shown in FIG. 6, is the left front end side of the body inflating portion 17 (bag body 16) when the inflation is completed. It is formed to extend from. In the case of the embodiment, the outer tether 44 includes a vertical piece 45 disposed so as to extend forward from the left front end side of the main body expanding portion 17 and a front end side of the vertical piece 45 as shown in FIGS. A lateral piece 46 disposed substantially along the left-right direction so as to extend rightward, and the distal end 46a side (right end side) of the lateral piece 46 is the case 15 in the case of the embodiment. It is the structure fixed to the case 12 side with the attaching part 19 of the airbag 15 using the retainer 9 of the left side to attach. The outer tether 44 is disposed in order to stably inflate the airbag 15 (bag main body 16) that is deployed so as to largely protrude from the case 12 toward the rear left side.

  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 FIGS. A peripheral wall panel 50, a rear left panel 56, a rear right panel 58, which constitute a part of the rear side wall 27 in the main body inflating part 17, an upper panel 60U for the projecting part which constitutes an upper part of the projecting inflating part 32, a projecting part Six base fabrics, ie, a protrusion lower panel 60D constituting the lower portion of the expansion portion 32 and a protrusion side panel 61 constituting the side portion of the protrusion expansion portion 32, and the main body expansion The reinforcing cloth 65 that reinforces the region on the front end side when the expansion is completed in the portion 17, the four reinforcing cloths 64 that reinforce the peripheral edge of the gas inlet 20, and the peripheral portion of the gas inlet 20 are protected from the expansion gas. And a protective cloth 66.

  The peripheral wall panel 50 divides the region of the peripheral wall portion 18 in the main body inflating portion 17 into two parts in the vertical direction, and an upper portion 51 constituting an upper portion and a lower portion 53 constituting a lower portion, respectively. The upper part 51 and the lower part 53 are configured to be connected on the front edge side of the mounting portion 19.

  The rear left panel 56 and the rear right panel 58 are configured to divide the portion of the rear side wall portion 27 in the main body inflating portion 17 at the completion of the expansion into left and right. In the embodiment, the rear left panel 56 is In the rear side wall portion 27, a left region is formed from the center line CL1 along the front-rear direction passing through the attachment center C1, and the rear right panel 58 forms a right region from the center line CL1 in the rear side wall portion 27. (See FIG. 6). In the rear left panel 56, four openings 56e constituting the communication hole portion 34 are formed. Further, extending portions 56d and 58d constituting the rear portion 39 of the front and rear tether 37 are formed on the inner peripheral edges 56c and 58c of the rear left panel 56 and the rear right panel 58.

  In the airbag 15 according to the embodiment, the overhanging inflating portion 25 protruding so as to be disposed in front of the steering wheel 70 when the inflation is completed includes the upper side portion 51 in the peripheral wall panel 50, the left side portion 52 of the lower side portion 53, 54 and the left side portion 57 of the rear left panel 56 are joined together. The left side part 52 of the upper part 51 in the peripheral wall panel 50 constitutes the upper wall 25b of the overhanging expansion part 25, and the left side part 54 of the lower part 53 of the peripheral wall panel 50 forms the lower wall 25c of the overhanging expansion part 25. It is composed. The left side portion 57 of the rear left panel 56 constitutes the rear wall 25d of the overhanging expansion portion 25. The upper portion 51, the lower portion 53, and the left side portions 52, 54, and 57 of the rear left panel 56 are configured to protrude toward the left as shown in FIGS. At the same time, the edges are made substantially straight and converged toward the tip 52a, 54a, 57a side, and the tip 52a, 54a, 57a side is made to be acute-angled, so Defines the protruding shape. Specifically, in the case of the embodiment, the overhanging expansion portion 25 is the sum of the angles α, β, γ (see FIGS. 9 and 10) of the portions on the side of the tips 52a, 54a, 57a of the left side portions 52, 54, 57. By setting the angle to 360 ° or less, a substantially triangular pyramid-shaped expansion completion shape as shown in FIGS. 4 and 6 is obtained. The protruding state toward the steering wheel 70 at the completion of expansion and the rear surface (rear wall 25d) ) Side inclination state is defined. Specifically, in the case of the embodiment, the angles α, β, γ of the portions on the side of the tips 52a, 54a, 57a of the left side portions 52, 54, 57 are set to about 258 °.

  The protrusion upper panel 60U constitutes a portion of the upper wall portion 32a in the protrusion expansion portion 32 when the expansion is completed, and the protrusion lower panel 60D is a portion of the lower wall portion 32b in the protrusion expansion portion 32 when the expansion is completed. Is configured. The protrusion upper panel 60U and the protrusion lower panel 60D have substantially the same substantially rectangular shape (see FIG. 10), and the front edge of the right edge 60d is directed rightward. It is curved. In the airbag 15 of the embodiment, the curved shape of the right edge 60d of each protrusion upper panel 60U and protrusion lower panel 60D is the rear wall portion 27 ( The curved shape in the vicinity of the intersection (front-end-side portion) with the front-projection restraining surface 30) is defined. The protrusion side panel 61 is configured as a belt having a longitudinal direction along the left-right direction, and the front wall portion 32e, the left wall portion 32c, the rear wall portion 32f, and the right wall portion of the protrusion expansion portion 32 when the expansion is completed. This constitutes the site 32d. In the case of the embodiment, the side panel 61 for the projecting portion is positioned at the boundary between the front wall portion 32e and the right wall portion 32d at both ends in the longitudinal direction, so that the front wall portion 32e, the left wall portion 32c, and the rear The wall portion 32f and the right wall portion 32d are configured so that the portions on both ends on the longitudinal direction side that form the right end side of the front wall portion 32e and the front end side of the right wall portion 32d are widened. ,It is configured. Further, the opening side panel 61 for the projecting portion is formed with four openings 61 e constituting the communication hole portion 34.

  The four reinforcing cloths 64 that reinforce the peripheral portion of the gas inlet 20 have a substantially rectangular outer shape. The protective cloth 66 has a substantially rectangular shape whose outer shape is slightly larger than that of the reinforcing cloth 64, and is a stitched part (specifically, an upper part 51 and a lower part in the peripheral wall panel 50). 53 is configured so as to cover the inner peripheral surface side of a stitched portion (not shown) that is sewn between the edges of the stitched portion 53, and to protect the stitched portion from the inflation gas (see FIGS. 5 and 6). ). As shown in FIGS. 6 and 9, the reinforcing cloth 65 that reinforces the region on the front end side when the expansion is completed in the main body inflating portion 17 has an outer shape that is a connection portion between the upper portion 51 and the lower portion 53 in the peripheral wall panel 50. It is configured as an outer shape that covers the vicinity over the entire region on the left and right.

  In the embodiment, the peripheral wall panel 50, the rear left panel 56, the rear right panel 58, the protruding portion upper panel 60 </ b> U, the protruding portion lower panel 60 </ b> D, the protruding portion side panel 61, the reinforcing cloth 64, which constitute the bag body 16. 65, protective cloth 66, front side material 63 constituting the front and rear tether 37, tether base cloths 41 a and 41 b constituting the upper and lower tethers 41, tether base cloths 42 a and 42 b constituting the regulation tether 42, and the outer tether 44 Each of the vertical piece 45 and the horizontal piece 46 is formed of a flexible woven fabric made of polyester yarn, polyamide yarn, or the like.

  A steering wheel airbag device 73 is mounted on the steering wheel 70 disposed in front of the driver seat DS disposed on the left side of the passenger seat PS. The steering wheel airbag device 73 includes a steering wheel airbag (hereinafter abbreviated as “airbag”) 74 that is folded and housed in a central boss portion 71 of the steering wheel 70, and an inflation gas in the airbag 74. And an inflator not shown. The airbag 74 is formed into a bag shape formed of a flexible sheet body, and when an inflator (not shown) is operated, an inflation gas from the inflator is caused to flow into the interior, so that the upper surface (rear surface) of the steering wheel 70 is It is the structure which expand | swells so that it may cover the whole surface. As shown in FIGS. 16 and 17, the airbag 74 has a substantially disk shape with a larger outer diameter than the ring portion 72 of the steering wheel 70, as shown in FIGS. 16 and 17. The driver MD is supported so as to be supported by the ring portion 72 so as to be able to protect the driver MD that moves forward when the vehicle V collides. The inflator (not shown) of the steering wheel airbag device 73 also operates in the case of a frontal collision, an oblique collision, and an offset collision of the vehicle V, similarly to the inflator 8 of the passenger seat airbag apparatus M. It is configured as follows.

  Next, manufacture of the airbag 15 of embodiment is demonstrated. As shown in FIG. 13B, one end side of the tether base fabrics 41a and 41b is previously sewn to the upper panel 60U and the lower panel 60D. Let me.

  First, as shown in A of FIG. 11, the reinforcing cloth 65 is overlapped on the inner peripheral surface side of the peripheral wall panel 50 in a flat developed state, and is sewn to the peripheral wall panel 50. Next, the front portion material 63, the reinforcing cloth 64, and the protective cloth 66 are overlaid on the reinforcing cloth 65 (see B in FIG. 11), and are sewn at a position that becomes the periphery of the gas inlet 20. . Thereafter, as shown in FIG. 12A, a gas inlet 20 and a mounting hole 21 are formed by drilling. Next, as shown in FIG. 12B, the reinforcing cloth 65 is positioned on the outer peripheral side, the peripheral wall panel 50 is folded back, and the vertical piece 45 of the outer tether 44 is sandwiched between the front edge side portions and the upper side. The front edges 51c and 53c of the part 51 and the lower part 53, the left edges 51a and 53a, and the right edges 51b and 53b are sewn together with a suture, and the vertical piece 45 of the outer tether 44 is sewn. Sew together.

  Further, as shown in FIG. 13A, on the outer surface side of the rear left panel 56, the protrusion side panel 61 is placed so that the positions of the openings 56e and 61e are matched, and the peripheral edges of the openings 56e and 61e The protruding portion side panel 61 is sewn to the rear left panel 56 at this portion (the outer portion 35 a of the peripheral portion 35). Next, as shown in B of FIG. 13, one end sides of the tether base fabrics 42 a and 42 b are sewn to the protruding portion side panel 61. Thereafter, the front edge 60a of the protrusion upper panel 60U is sewn to the right end region of the upper edge 61a of the protrusion side panel 61, and then the protrusion upper panel 60U and the protrusion side panel. 61 and the left edge 60c, the rear edge 60b, and the right edge 60d of the upper panel 60U for the projecting part are connected to the upper edge 61a of the side panel 61 for the projecting part. Sews the rest. Similarly, the front edge 60a of the lower part panel 60D for the projecting part is sewn to the region on the right end side of the lower edge 61b of the side panel 61 for the projecting part and is tilted to the inner surface side of the rear left panel 56. The left edge 60c, the rear edge 60b, and the right edge 60d of the protrusion lower panel 60D are sewn to the remaining portion of the lower edge 61b of the protrusion side panel 61. Next, the upper and lower tethers 41 are formed by sewing the other ends of the tether base fabrics 41a and 41b. Thereafter, the protrusion upper panel 60U, the protrusion lower panel 60D, and the protrusion side panel 61 are connected to the left edge 61c and the right edge of the unstitched protrusion side panel 61 so that the seam allowance is not exposed. The rear left panel 56 is flattened by using the gap 61d to invert. Then, using the gap between the left edge 61c and the right edge 61d of the unstitched side panel 61 for the projecting portion, the other ends of the tether base fabrics 42a and 42b are joined to each other to form the regulation tether 42, Then, if the left edge 61c and the right edge 61d of the side panel 61 for protrusion parts are sewn on the rear left panel 56, the protrusion expansion part 32 can be formed as shown to A of FIG. Next, if the inner peripheral edges 56c and 58c of the rear left panel 56 and the rear right panel 58 are sewn together using sutures as shown in FIGS. 14B and 14C, the protruding inflatable portion 32 is attached. The rear side wall portion 27 in the state can be formed.

  Thereafter, as shown in FIG. 15A, the projecting and expanding portion 32 is directed inward to the peripheral wall panel 50 in a state where the upper portion 51 and the lower portion 53 are opened so as to separate the trailing edges 51d and 53d from each other. The rear left panel 56 and the rear right panel 58 are overlapped, and the rear edge 51d of the upper portion 51 and the upper edges 56a and 58a of the rear left panel 56 and the rear right panel 58 are sewn together. Similarly, the rear edge 53d of the lower portion 53 and the lower edges 56b and 58b of the rear left panel 56 and the rear right panel 58 are sewn together (see B in FIG. 15). Next, the bag main body 16 can be formed by using one of the gas inlets 20 and inverting so that the seam allowance is not exposed to the outside. Next, the rear end 38 c side of the front portion 38 and the front end 39 a side of the rear portion 39 are pulled out from the gas inlet 20 and sewn to form the front and rear tethers 37. Thereafter, the outer tether 44 can be formed by sewing the horizontal piece portion 46 to the vertical piece portion 45 projecting forward from the left front end of the main body inflating portion 17 in the bag main body 16. As shown, the airbag 15 can be manufactured.

  The airbag 15 thus manufactured is folded so as to be housed in the case 12 with the retainers 9 and 9 housed therein, and the folded airbag 15 is broken so as not to collapse. Wrapping with a possible wrapping sheet (not shown). Next, the folded airbag 15 is placed on the bottom wall portion 12 a of the case 12. The body portion 8a of each inflator 8 is inserted into the case 12 from below the bottom wall portion 12a, and each bolt 9a protruding downward from the bottom wall portion 12a is inserted into the flange portion 8c of the inflator 8. Then, if the nut 10 is fastened to each bolt 9a protruding from the flange portion 8c of the inflator 8, the airbag 15 and the inflators 8 and 8 folded on the case 12 can be attached.

  Then, the peripheral wall portion 12b of the case 12 is locked to the connecting wall portion 6c of the airbag cover 6 in the instrument panel 1 mounted on the vehicle V, and a bracket (not shown) of the case 12 is fixed to the body side of the vehicle V. Thus, the passenger seat airbag device M can be mounted on the vehicle V.

  In the passenger seat airbag apparatus M of the embodiment, when mounted on the vehicle V, the vehicle V is inflated from each gas discharge port 8b of each inflator 8 at the time of frontal collision, oblique collision, or offset collision of the vehicle V. When the gas is discharged, the airbag 15 is inflated by inflating the inflation gas into the interior, and the door portions 6a and 6b of the airbag cover 6 are pushed open. The airbag 15 protrudes upward from the case 12 through an opening formed by pushing and opening the door portions 6a and 6b of the airbag cover 6, and expands and inflates while protruding toward the vehicle rear side. As shown in the two-dot chain line in FIGS. 1 to 3 and FIGS. 16 and 17, the expansion is completed 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. At this time, the airbag 74 for the steering wheel also completes the inflation so as to cover the upper surface (rear surface) of the steering wheel 70 by flowing the inflation gas into the interior (see FIGS. 16 and 17). ).

  In the passenger seat airbag apparatus M according to the embodiment, the airbag 15 is disposed so as to project rearward from the front collision restraint surface 30 on the center side in the left-right direction of the vehicle V when the inflation is completed. As shown in FIG. 17, the projecting and expanding portion 32 is configured by a side surface (right wall portion 32 d) disposed on the front collision restraint surface 30 side (right side) when the expansion is completed, as shown in FIG. 17. The head MH of the occupant MP that moves obliquely forward (diagonally to the left) on the driver's seat DS side at the time of an oblique collision or offset collision of the vehicle V is configured to be able to be protected, and when the inflation is completed, the driver's seat DS side The head MH of the driver MD that moves toward the diagonally forward (right diagonally forward) on the passenger seat PS side at the time of the diagonal collision of the vehicle V or the offset collision by the side surface (left wall portion 32c) arranged on the (left side). Keep Capable, is constructed. Therefore, at the time of an oblique collision or an offset collision of the vehicle V, the occupant MP seated in the passenger seat PS or the driver MD seated in the driver seat DS moves toward the diagonally forward side that is the center side in the left-right direction and forward. In this case, the head MH of the occupant MP or the driver MD can be protected accurately by the side surface of the projecting and expanding portion 32. Further, in the passenger seat airbag apparatus M of the embodiment, the overhanging inflating portion in which the airbag 15 projects so as to be disposed in front of the steering wheel 70 in the region on the front side of the projecting inflating portion 32 when the inflation is completed. 18, the driver MD moving diagonally right forward, the head MH, the steering wheel airbag 74 and the protruding inflatable portion 32, as shown in FIG. 18. The overhanging expansion portion 25 can accurately receive the head MH of the driver MD.

  Therefore, in the passenger seat airbag device M of the embodiment, the driver MD seated in the driver seat DS moving obliquely forward and the occupant MP seated in the passenger seat PS can be protected accurately.

  In particular, in the passenger airbag device M of the embodiment, as shown in FIG. 17, the right wall portion 32d of the protruding inflatable portion 32 that protects the head MH of the occupant MP seated on the passenger seat PS when the inflation is completed. The occupant MP is configured such that the vicinity (front end side portion) of the intersection with the rear side wall portion 27 (the front collision restraint surface 30) is curved so as to be continuously connected to the rear side wall portion 27. The head MH of the occupant MP can be received smoothly in a wide area from the straight portion of the right wall portion 32d through the curved portion to the front collision restraint surface 30. Can take it.

  In the passenger seat airbag device M of the embodiment, the overhanging inflation portion 25 of the airbag 15 is seen from above when the inflation is completed, and the side surface (left wall portion 32c) of the protruding inflation portion 32 on the driver seat DS side. ) To extend obliquely forward in a substantially straight line and reach the area on the front side of the steering wheel 70. That is, in the passenger seat airbag device M of the embodiment, the head of the driver MD that moves obliquely forward on the rear side portion (rear wall 25d) of the overhanging inflation portion 25 when the inflation is completed. Since it can arrange | position with facing MH (refer FIG. 18), the driver | operator's MD head MH can be received by a wide planar site | part. If such a point is not taken into consideration, the overhanging inflating portion may not be configured to extend obliquely forward in a substantially straight line on the rear side when the inflating is completed. The main body inflating part may be configured to have a substantially plate-like shape from all sides of the left wall part so as to protrude to the front side of the steering wheel, or to curve the rear side part of the overhanging inflating part when the expansion is completed. Good.

  DESCRIPTION OF SYMBOLS 1 ... Instrument panel (instrument panel), 4 ... Wind shield, 6 ... Air bag cover, 8 ... Inflator, 9 ... Retainer, 12 ... Case (storage part), 15 ... Air bag, 16 ... Bag body, 18 ... Circumferential wall 25 ... Overhang expansion part, 25a ... Tip, 25d ... Rear wall (rear surface), 27 ... Rear side wall part, 29 ... Passenger protection part, 30 ... Front impact restraint surface, 32 ... Projection expansion part, 32c ... Left wall Part, 32d ... right wall part, 70 ... steering wheel, 74 ... steering wheel airbag (airbag), MD ... driver, MP ... passenger, MH ... head, DS ... driver's seat, PS ... passenger seat, V ... Vehicle, M ... Airbag device for passenger seat.

Claims (3)

Folded and stored in a storage part provided in an instrument panel disposed in front of the passenger seated in the passenger seat, inflated so as to flow into the interior and protrude toward the rear of the vehicle, An airbag device for a passenger seat provided with an airbag configured to protect an occupant,
The airbag includes a main body inflating portion and a projecting inflating portion that protrudes rearward from the rear surface side of the main body inflating portion when the inflation is completed, and an occupant that can protect the occupant on the rear surface side when the inflation is completed Configured as a protection part,
The occupant protection unit
A front collision restraint surface that is configured from a rear side wall portion that is disposed on the occupant side when the inflation is completed in the main body inflatable part, and that can protect the head of the occupant that moves forward during a front collision of the vehicle,
The projecting and expanding portion;
And is configured to include
The projecting and expanding portion projects rearward from the front-projection restraining surface at the center in the left-right direction of the vehicle when expansion is completed, and covers the steering wheel at the front end of the driver's seat at the rear end side when expansion is completed. The vehicle is configured to protrude rearward from the airbag for a steering wheel that inflates like this, and is driven at the time of an oblique collision or an offset collision of the vehicle by a side surface arranged on the front collision restraint surface side when the inflation is completed. The head of the occupant moving diagonally forward on the seat side can be protected, and the side surface arranged on the driver's seat side when the inflating is completed allows the passenger's head to be diagonally forward on the passenger seat side at the time of an oblique collision or an offset collision. Configured to be able to protect the driver's head moving towards
Said body expansion section, the front area of the projecting inflatable portion of the completely inflated, the projecting inflatable portion projecting so as to be positioned in front of the steering wheel, is configured to Ru is disposed,
The airbag device for a passenger seat , wherein the overhanging inflating portion is formed integrally with the main body inflating portion . Folded and stored in a storage part provided in an instrument panel disposed in front of the passenger seated in the passenger seat, inflated so as to flow into the interior and protrude toward the rear of the vehicle, An airbag device for a passenger seat provided with an airbag configured to protect an occupant,
The airbag is configured as an occupant protection part capable of protecting the occupant on the rear side when the inflation is completed,
The occupant protection unit
Front restraint restraint surface capable of protecting the head of the occupant moving forward during a frontal collision of the vehicle;
At the time of the completion of the expansion, the vehicle is arranged to project rearward from the front collision restraint surface on the center side in the left-right direction of the vehicle. Alternatively, a protruding inflatable part configured to be able to protect the head of the occupant moving diagonally forward on the driver's seat side at the time of an offset collision,
And is configured to include
The projecting and inflating portion is configured to project the rear end side when the inflation is completed to the rear of the steering wheel airbag that is inflated so as to cover the steering wheel in front of the driver's seat. The side surface arranged on the seat side is configured to protect the head of the driver who moves toward the front side of the passenger seat at the time of the diagonal collision or the offset collision of the vehicle,
The airbag, the front area of the projecting inflatable portion of the completely inflated, the projecting inflatable portion projecting so as to be positioned in front of the steering wheel, is configured to Ru is disposed,
An airbag device for a passenger seat , wherein the overhanging inflation portion is formed in a tapered shape so as to be converged toward the distal end side . The overhanging inflation portion of the airbag extends obliquely forward in a substantially straight line from the side surface of the protruding inflation portion on the driver's seat side when viewed from above, and reaches a region on the front side of the steering wheel. The airbag device for a passenger seat according to claim 1 or 2, wherein the airbag device is disposed as described above.

Images