JP6973345B2 - Passenger seat airbag - Google Patents

Description

The present invention relates to a passenger airbag used in a passenger airbag device mounted in front of the passenger seat of a vehicle.

Conventionally, in the passenger seat airbag, the outer peripheral wall when the expansion is completed extends forward from the rear wall portion that receives the occupant, the upper wall portion that extends forward from the upper edge of the rear wall portion, and the lower edge of the rear wall portion. The lower wall portion, which is connected to the upper wall portion on the front end side and has an inflow opening for allowing the expansion gas to flow in, and the upper and lower edges from the left edge of the rear wall portion to the upper wall portion and the lower wall portion. It is configured to include a left wall portion that extends forward while connecting the two, and a right wall portion that extends forward while connecting the upper and lower edges to the upper wall portion and the lower wall portion from the right edge of the rear wall portion. (See, for example, Patent Document 1). In this airbag, the rear panel constituting the rear wall portion is composed of the left rear panel and the right rear panel divided into two left and right, and the left rear panel and the right rear panel are each rear wall portion. The part extending from the lower edge side to the left and right edges is the rear side edge of the left panel forming the left side and the left wall portion of the lower wall portion, and the rear side of the right panel forming the right side and the right wall portion of the lower wall portion. It was formed by being combined with the porch.

Japanese Unexamined Patent Publication No. 2010-241295

However, in the conventional passenger seat airbag, the left rear panel and the right rear panel connect the lower edge side of each to the left and right sides of the trailing edge extending in the left-right direction of the lower wall portion, and in the left-right direction. Since the width dimension of the rear wall is widened toward the lower edge side, when the expansion is completed, both the left and right sides on the lower side of the rear wall portion swell, and the volume is increased. Therefore, there is room for improvement when the volume is reduced while ensuring the width dimension in the left-right direction for receiving the occupants on both the left and right sides of the upper part of the rear wall portion.

The present invention solves the above-mentioned problems, and provides a passenger seat airbag capable of reducing the volume by ensuring the width dimension of the occupant restraint area on the upper side of the rear wall portion at the completion of expansion in the left-right direction. The purpose is to do.

In the passenger seat airbag according to the present invention, the outer peripheral wall at the time of completion of expansion has a rear wall portion that receives a occupant, an upper wall portion that extends forward from the upper edge of the rear wall portion, and a lower edge of the rear wall portion. From the left edge of the rear wall portion, the upper wall portion and the said From the left wall portion extending forward while connecting the upper and lower edges to the lower wall portion and the right edge of the rear wall portion, extending forward while connecting the upper and lower edges to the upper wall portion and the lower wall portion. Consists of a right wall part,
The rear panel constituting the rear wall portion is a passenger seat airbag composed of a left rear panel and a right rear panel divided into left and right.
The left rear panel and the right rear panel
The portions extending from the lower edge side of the rear wall portion to the left and right edge sides are the rear edge of the left panel forming the left side of the lower wall portion and the left wall portion, and the right side and the right side of the lower wall portion. In addition to being configured to be connected to the rear side edge of the right panel that forms the wall,
The portions on the left and right edges of the rear wall portion are formed into a straight line substantially parallel to the mutual dividing lines, and a curved shape that narrows the width dimension in the left-right direction toward the lower edge side.
The rear edge of the left panel and the rear edge of the right panel are linear portions corresponding to the left and right edge sides of the rear wall portion of the left rear panel and the right rear panel, respectively, and the left rear. It is provided with a curved portion corresponding to the lower edge side of the panel and the right rear panel, and is provided with.
The curved portion of the rear edge of the left side panel and the rear edge of the right side panel flattens the left side panel and the right side panel, respectively, along the portion of the lower wall portion in the front-rear direction. In the unfolded state, the vicinity of the center of the curve extending from the rear end portion connected to the lower end of the dividing line between the left rear panel and the right rear panel to the linear portion is projected to the rear side from the rear end portion. It is characterized by being configured as a curve.

In the passenger seat airbag according to the present invention, the curved lower edge that narrows the width dimension in the left-right direction in the left rear panel and the right rear panel constituting the rear wall portion is curved on the rear edge side of the left panel and the right panel. It is configured to be connected to the shaped part, and the curved part is formed from the rear end near the center of the curve extending from the rear end to the straight part connected to the lower end of the dividing line between the left rear panel and the right rear panel. It is a curve that protrudes to the rear. Therefore, the lower edge side of the left rear panel and the right rear panel constituting the rear wall portion narrows the width dimension in the left-right direction, and narrows the volume of the left and right portions on the lower edge side of the rear wall portion. Further, the vicinity of the center of the lower edge of the rear wall portion formed by connecting the left rear panel and the right rear panel is connected to the rear end portion of the left panel and the right panel so as to be arranged curved forward. Since it is pulled forward, the width dimension on the lower edge side of the rear wall portion is substantially narrowed, and the volume of the portion is narrowed. As a result, the volume of the airbag when expansion is completed is reduced. Can be reduced. If the width dimension of the rear wall portion in the left-right direction on the upper side is set to a dimension that allows the occupant to be appropriately received, the rear wall portion may be located on the lower edge side of the left rear panel or the right rear panel. A configuration that narrows the width dimension in the left-right direction or pulls forward near the center of the lower edge side of the rear wall portion does not cause an effect of reducing the width dimension in the left-right direction of the upper part of the rear wall portion. Even if the volume is reduced, the occupant restraint area on the upper side of the rear wall portion can be sufficiently secured.

Therefore, in the passenger seat airbag according to the present invention, the width dimension in the left-right direction of the occupant restraint area on the upper side of the rear wall portion at the time of completion of expansion can be secured, and the volume can be reduced.

In the passenger seat airbag according to the present invention, the lower wall portion is configured by mutually connecting the lower left panel and the lower right panel, which are divided into two left and right, including the inflow opening. ,
A curved portion, which is curved and overlaps so as to intersect with each other, is provided on the rear side of the portion of the inflow opening in a state where the mutual connecting edge between the lower left panel and the lower right panel is spread flat. It is desirable that it is configured so as to be.

In such a configuration, when the expansion is completed, the lower wall portion can be ensured to have a shape that bends downward on the rear side of the inflow opening so as to bend the rear side downward from the front side, and the passenger seat in front of the passenger seat. It is easy to adhere to the upper surface side of the instrument panel on which the airbag device is mounted. Therefore, even if the lower edge side of the rear wall portion at the time of completion of expansion narrows the width dimension in the left-right direction, a wide area for contact with the instrument panel can be secured, and the reaction force from the instrument panel can be accurately applied when the occupant is received. Can be secured.

In this case, in the passenger seat airbag according to the present invention, the outer peripheral wall is composed of a left side seat material and a right side seat material which are divided into two left and right.
The left sheet material is
In addition to being configured with the left panel
The left upper left panel, which is the upper wall portion divided into left and right, is extended on the upper edge side of the left panel, and the left rear panel is extended on the upper part of the rear edge side of the left panel, and the lower side of the left panel is extended. It is configured by arranging the lower left panel on the veranda.
The right sheet material is
In addition to being configured with the right panel
On the upper edge side of the right side panel, the right upper right panel having the upper wall portion divided into left and right is extended, and on the upper part of the rear edge side of the right side panel, the right rear panel is extended and below the right side panel. It is desirable that the lower right panel is arranged on the veranda.

In such a configuration, when the expansion is completed, the rear side of the inflow opening in the lower wall portion is curved downward, and the lower left panel and the lower right panel forming the lower wall portion may be separated to the left and right. The parts connected to them are the left side sheet material and the right side sheet material, and the airbag itself is divided into two parts on the left and right. That is, the entire airbag is formed of two sheet materials having the minimum number of the left side sheet material and the right side sheet material for configuring so that the curved shape of the lower wall portion can be secured, and a predetermined edge. It is possible to reduce the number of places where the airbags are connected to each other, and it is possible to manufacture airbags with as few joining operations as possible.

It is a schematic vertical sectional view which shows the vehicle-mounted state of the passenger seat airbag device using the passenger seat airbag of one embodiment which concerns on this invention, and further shows the state which the airbag is inflated. It is a schematic front view which shows the operating state of the passenger seat airbag device of an embodiment. It is the schematic perspective view and the schematic front view at the time of expansion of the passenger seat airbag of an embodiment. It is a perspective view which shows the constituent material of the passenger seat airbag of an embodiment. It is a figure which shows the manufacturing process of the passenger seat airbag of an embodiment in order. It is a figure which shows the manufacturing process of the passenger seat airbag of embodiment in order, and shows the process after B of FIG. It is a figure which shows the manufacturing process of the passenger seat airbag of embodiment in order, and shows the process after B of FIG. It is a figure which shows the manufacturing process of the passenger seat airbag of embodiment in order, and shows the process after B of FIG. It is a figure which shows the manufacturing process of the passenger seat airbag of embodiment in order, and shows the process after B of FIG. It is a top view which shows the seat material of the modification of the passenger seat airbag of an embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The passenger airbag 15 (hereinafter, appropriately abbreviated as an airbag) according to the embodiment is in front of the passenger seat as shown in FIGS. 1 and 2. It is used for the passenger airbag device SA arranged in. As shown in FIG. 1, the passenger seat airbag device SA is a top mount type mounted inside the upper surface 2 side of the instrument panel (hereinafter abbreviated as "instrument panel") 1 below the windshield 4. ing.

The airbag device SA includes an airbag 15 that is folded and stored, an inflator 8 that supplies an expansion gas to the airbag 15, and a case 12 as a storage portion that stores and holds the airbag 15 and the inflator 8. It is configured to include a retainer 9 for attaching the airbag 15 and the inflator 8 to the case 12, and an airbag cover 6 that covers the upper part of the airbag 15 that is folded and stored.

The airbag cover 6 is integrally formed with an instrument panel 1 made of synthetic resin, and is configured to include two door portions 6a and 6b that are pushed by the airbag 15 during expansion and expansion and open on both front and rear sides. .. Further, a connecting wall portion 6c connected to the case 12 is formed around the door portions 6a and 6b in the airbag cover 6. A locking hole 6d for locking the locking claw 12c of the case 12 is formed in the connecting wall portion 6c.

The inflator 8 is configured to include a substantially columnar main body portion 8a having a plurality of gas discharge ports 8b, and a flange portion 8c for attaching the inflator 8 to the case 12.

The case 12 as a storage portion is formed in a substantially rectangular parallelepiped shape made of sheet metal having a rectangular opening on the upper end side, and has a substantially rectangular parallelepiped bottom wall portion 12a to which the inflator 8 is inserted from below and attached, and a bottom wall. It is configured to include a peripheral wall portion 12b extending upward from the outer peripheral edge of the portion 12a and engaging the connecting wall portion 6c of the airbag cover 6. At the upper end of the peripheral wall portion 12b, a locking claw 12c that is inserted into the locking hole 6d of the connecting wall portion 6c to lock the connecting wall portion 6c is formed.

In the case of the embodiment, the airbag 15 and the inflator 8 are attached to the peripheral edge of the inflow opening 26 described later in the airbag 15 by using each bolt 9a of the retainer 9 arranged in the airbag 15 as an attachment means. It is attached to the bottom wall portion 12a of the case 12 by penetrating the seat 27, the bottom wall portion 12a of the case 12, and the flange portion 8c of the inflator 8 and fixing the nut 10. Further, a bracket (not shown) connected to the body side of the vehicle is arranged on the bottom wall portion 12a of the case 12.

In the case of the embodiment, as shown in FIGS. 1 to 3, the air bag 15 has a substantially quadrangular pyramid shape with the front end side tapered, and the outer peripheral wall 16 at the time of expansion completion is on the rear end side. The rear wall portion 18 which is arranged and has a substantially rectangular shape to receive the occupant M is provided, and the upper wall portion 21, the lower wall portion 25, and the left wall portion 31 extending forward in a substantially quadrangular pyramid shape from the outer peripheral edge of the rear wall portion 18. , And the right wall portion 33. The upper wall portion 21 extends forward from the upper edge 18a of the rear wall portion 18 and has a vent hole 22, and the lower wall portion 25 extends forward from the lower edge 18b of the rear wall portion 18 and extends to the front end (front end (front). It is connected to the upper wall portion 21 on the edge) 25a side and has an inflow opening 26 for allowing the expansion gas to flow in. The left wall portion 31 extends forward from the left edge 18c of the rear wall portion 18 while connecting the upper and lower edges 31a and 31b to the upper wall portion 21 and the lower wall portion 25, and the right wall portion 33 is the rear wall portion. From the right edge 18d of 18, the upper wall portion 21 and the lower wall portion 25 extend forward while connecting the upper and lower edges 33a and 33b.

As a characteristic portion of the airbag 15 of the embodiment, as shown in FIGS. 6 and 7, the rear surface side panel constituting the rear wall portion 18 is divided into left and right rear panels 43 and right rear panel 53. The left rear panel 43 and the right rear panel 53 extend from the lower edge 18b side of the rear wall portion 18 to the left and right edges 18c and 18d, respectively, on the left side and the left side of the lower wall portion 25. The rear edge 40a of the left panel 40 forming the wall portion 31 and the rear edge 50a of the right panel 50 forming the right side of the lower wall portion 25 and the right wall portion 33 are coupled to each other. Further, in the left rear panel 43 and the right rear panel 53, the portions of the rear wall portion 18 on the left and right edges 18c and 18d are formed in a straight line substantially parallel to the mutual dividing line SL, and the lower edge 43c, It has a curved shape (approximately 1/4 arc shape) that narrows the width dimension in the left-right direction toward the 53c side. The rear edge 40a of the left panel 40 and the rear edge 50a of the right panel 50 correspond to the left and right edges 18c and 18d of the rear wall portion 18 of the left rear panel 43 and the right rear panel 53, respectively. It includes linear portions 40b and 50b, and curved portions 40c and 50c corresponding to the lower edges 43c and 53c of the left rear panel 43 and the right rear panel 53. Further, the curved portions 40c and 50c of the rear side edge 40a of the left side panel 40 and the rear side edge 50a of the right side panel 50 are the left side panel 40 and the right side panel 50, respectively, in the front-rear direction of the portion of the lower wall portion 25. The curve extending from the rear end portions 40d, 50d to the linear portions 40b, 50b connected to the lower ends 43e, 53e of the dividing line SL of the left rear panel 43 and the right rear panel 53 in a flatly developed state along the above. The vicinity of the central portions 40e and 50e is configured as a curve protruding rearward from the rear end portions 40d and 50d, and these configurations are characteristic portions of the airbag 15 of the embodiment.

Specifically, in the airbag 15 of the embodiment, as shown in FIGS. 4 to 6, the outer peripheral wall 16 is composed of a left side sheet material 38 and a right side sheet material 48, which are divided into two left and right parts. These sheet materials 38 and 48 are composed of woven fabrics such as polyamide yarn and polyester yarn, and are symmetrical with each other including the parts of the left and right rear panels 43 and 53 and the parts of the left and right panels 40 and 50. It is in shape.

The left side sheet material 38 is configured to include the left side panel 40. Further, in the left side sheet material 38, the upper left panel 41 on the left side obtained by dividing the upper wall portion 21 into left and right is extended on the upper edge 31a side of the left side panel 40, and the rear edge side (rear side edge 40a) of the left side panel 40 is extended. The left rear panel 43 is extended to the upper part, and the left lower left panel 42 having the lower wall portion 25 divided into left and right is arranged on the lower edge 31b side of the left panel 40.

Further, the right side sheet material 48 is configured to include the right side panel 50. Further, in the right side sheet material 48, the upper right panel 51 on the right side, which is the upper wall portion 21 divided into left and right, is extended on the upper edge 33a side of the right side panel 50, and the rear edge side (rear side edge 50a) of the right side panel 50 is extended. The right rear panel 53 on the right side, which is the rear panel 55 divided into two left and right, is connected to the upper part, and the lower right panel 52 on the right side, which is the lower wall portion 25 divided into the left and right, is arranged on the lower edge 33b side of the right panel 50. It is composed of.

The lower left panel 42 and the lower right panel 52, in which the lower wall portion 25 is divided into two left and right, have front edges (bonding edges) 42a and 52a that are mutually coupled, including the portion of the inflow opening 26, and the lower wall portion 25. 42c, 52c, which are formed so as to be divided into two parts on the left and right, and which are curved and overlapped so as to intersect each other, particularly on the rear side of the portion of the inflow opening 26 in a flatly deployed state. It is configured to be arranged.

In the airbag 15, as shown in FIG. 4, two reinforcing cloths 60 for reinforcing the mounting seat 27 on the peripheral edge of the inflow opening 26, and expansion gas flowing in from the inflow opening 26 are placed on both front and rear sides. The guiding rectifying cloth 62, the vertical tether 65 connecting the mounting seat 27 and the rear wall portion 18 so as to restrict the rearward protrusion of the rear wall portion 18, and the left wall portion 31 and the right wall portion 33 A horizontal tether 69, which connects the left wall portion 31 and the right wall portion 33, is arranged so as not to be separated. Further, a patch 63 that reinforces the stitched portion between the outer edges 62b and 62b of the rectifying cloth 62, a patch 70 that reinforces the stitched portion between the left wall portion 31 and the right wall portion 33 in the lateral tether 69, and the peripheral edge of the vent hole 22. It is configured to include a reinforcing cloth 72 for reinforcing the curved portion 42c and a patch cloth 74 for reinforcing the sutured portion between the curved portions 42c and 52c. Similar to the sheet materials 38 and 48, these fabric materials are composed of woven fabrics such as polyamide yarn and polyester yarn. If the outer edges 62b and 62b of the rectifying cloth 62 are coupled to each other, an outflow port 62c for flowing out the expansion gas is formed on both the front and rear sides, and an auxiliary flow for auxiliary outflow of the expansion gas on both the left and right sides. The outlet 62d is arranged.

Explaining the manufacturing process of the airbag 15 of the embodiment, first, in the left side sheet material 38 and the right side sheet material 48, the patch cloths 70 and 74 and the reinforcing cloth 72 are sewn together to form a horizontal tether 69. The band piece 69a as a split body of the lateral tether 69 is sewn, and the folded-back portions 41b and 51b with the leading edges 41a and 51a folded back are sewn in order to increase the strength of the leading edges 41a and 51a. That is, as shown in A of FIG. 5, in the right side sheet material 48, the patch 70 is sewn to the stitched portion of the lateral tether 69, and the patch 74 is sewn to the portion of the curved portion 52c, and the vent hole 22 is sewn. The reinforcing cloth 72 is sewn to the arrangement site, and the tip edge 51a side is folded back and sewn. Then, as shown in B of FIG. 5, the band piece 69a is sutured to the sutured portion of the patch 70. Although not shown in the left sheet material 38, such work is similarly performed by suturing the patch 70 to the sutured portion of the lateral tether 69 and suturing the patch 74 to the site of the curved portion 42c, and vent hole. The reinforcing cloth 72 is sewn to the arrangement portion of the 22, the tip edge 41a side is folded back and sewn, and the band piece 69a is sewn to the sewn portion of the patch 70.

After that, as shown in A of FIG. 6, the left and right lower left panels 42 and the lower right panel 52 of the left side sheet material 38 and the right side sheet material 48 are overlapped with each other, and the central portion in the left-right direction is overlapped. Then, the front edges 42b and 52b from the front edge side to the front of the curved portions 42c and 52c are sewn together. Then, as shown in B of FIG. 6, the inflow opening 26 is formed in the front portion 66a side of the front side portion 66 of the vertical tether 65 and the central portion 62a in a state where the outer edges 62b and 62b sides of the rectifying cloth 62 are opened. Overlay on the part. Further, the patch 63, 63 is sewn to the outer edges 62b, 62b of the rectifying cloth 62.

Then, as shown in A of FIG. 7, the reinforcing cloth 60 is superposed on the forming portion of the inflow opening 26, and the overlapped portions are sewn together at the peripheral edge of the inflow opening 26.

In the embodiment, in the state before this, the vent hole 22 and the inflow opening 26 are not actually opened, and after suturing the peripheral edge of the inflow opening 26, the inflow opening is processed by drilling. 26, a vent hole 22, and a mounting hole 28 are opened.

After that, as shown in B of FIG. 7, the leading edge 41a of the upper left panel 41 and the leading edge 51a of the upper right panel 51, the curved portion 42c of the lower left panel 42 and the curved portion 52c of the lower right panel 52, and the tip of the left rear panel 43. The left side sheet material 38 and the right side sheet material 48 are folded back at the portions of the front edges 42b and 52b of the connecting edges 42a and 52a so as to overlap the edge 43d and the leading edge 53d of the right rear panel 53, respectively, and then overlapped. The edges 41a and 51a, the curved portions 42c and 52c, the rear edges 42d and 52d on the rear side thereof, and the leading edges 43d and 53d are sewn together. When the leading edge 43d of the left rear panel 43 and the leading edge 53d of the right rear panel 53 are sewn to each other, the trailing edge 67b of the trailing side portion 67 of the vertical tether 65 is also sewn together.

Then, as shown in A and B of FIG. 8, the left rear panel 43 and the right rear panel 53 are expanded flat, and the upper edges 43a and 53a are the trailing edges of the upper left panel 41 and the upper right panel 51, respectively. Suture with 41c and 51c. Further, the linear portion 40b and the curved portion 40c of the rear side edge 40a of the left side panel 40 are overlapped with the left edge 43b and the lower edge 43c of the left rear panel 43, and similarly, the rear side edge 50a of the right side panel 50 is overlapped. The linear portion 50b and the curved portion 50c of the above are overlapped with the right edge 53b and the lower edge 53c of the right rear panel 53, and the overlapped edges are sutured to each other.

After that, using the inflow opening 26, the front and back sides are inverted, and as shown in FIG. 9, the leading edge 41d of the upper left panel 41 and the leading edge 42e of the lower left panel 42 are overlapped, and similarly, the upper right panel 51. By overlapping the leading edge 51d and the leading edge 52e of the lower right panel 52 and suturing the overlapped edges to each other, the outer peripheral wall 16 of the airbag 15 can be formed. Then, using the inflow opening 26, the rear portion 66b of the front side portion 66 of the vertical tether 65 and the front edge 67a of the rear side portion 67 are pulled out of the airbag 15 and sewn so as to connect with each other. The strips 69a and 69a of the lateral tether 69 are pulled out and sewn together, and the outer edges 62b and 62b of the rectifying cloth 62 are pulled out and sewn together. Then, the airbag 15 can be manufactured.

The airbag 15 manufactured in this way has the retainer 9 arranged inside so that the bolt 9a protrudes from each mounting hole 28, and is folded. Then, each bolt 9a is housed in the case 12 so as to protrude from the bottom wall portion 12a of the case 12, and each bolt 9a protruding from the bottom wall portion 12a is inserted into the flange portion 8c of the inflator 8. If the nut 10 is fastened to each bolt 9a protruding from the flange portion 8c of the inflator 8, the airbag 15 can be attached to the case 12 together with the inflator 8. Then, the locking claw 12c is inserted into the locking hole 6d with respect to the connecting wall portion 6c of the airbag cover 6 in the instrument panel 1 mounted on the vehicle to lock the peripheral wall portion 12b of the case 12, and the case 12 is engaged. If a predetermined bracket (not shown) is fixed to the body side of the vehicle, the airbag device SA can be mounted on the vehicle.

After the airbag device SA is mounted on the vehicle, if the expansion gas is discharged from each gas discharge port 8b of the inflator 8 at the time of a frontal collision or an oblique collision of the vehicle, the airbag 15 will have the expansion gas inside. Inflows and expands, pushes open the door portions 6a, 6b of the airbag cover 6, and pushes open the door portions 6a, 6b of the airbag cover 6 to project upward from the case 12 through an opening formed. At the same time, it expands and expands while protruding toward the rear side of the vehicle, and as shown in FIGS. 1 and 2, 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. Will be.

In the airbag 15 of the embodiment, the left rear panel 43 and the right rear panel 53 constituting the rear wall portion 18 have curved lower edges 43c and 53c that narrow the width dimension in the left-right direction, and the left panel 40 and the right panel. It is configured to be coupled to the curved portions 40c and 50c on the trailing edge sides 40a and 50a of 50, and the curved portions 40c and 50c are the lower ends 43e and 53e of the dividing line SL between the left rear panel 43 and the right rear panel 53. The vicinity of the central portions 40e and 50e of the curve extending from the rear end portions 40d and 50d to the linear portions 40b and 50b is made to be a curve protruding rearward from the rear end portions 40d and 50d (see FIG. 7). Therefore, the lower edges 43c and 53c of the left rear panel 43 and the right rear panel 53 constituting the rear wall portion 18 narrow the width dimension WD in the left-right direction (see FIG. 2), and the lower edge 18b of the rear wall portion 18 The volume of the left and right parts on the side will be narrowed. Further, the left panel 40 and the right panel 50 are arranged so that the vicinity of the center 18bc of the lower edge 18b of the rear wall portion 18 formed by connecting the left rear panel 43 and the right rear panel 53 is arranged so as to be curved forward. Since it is coupled to the rear end portions 40d and 50d and pulled forward (see FIG. 1), the width dimension WD on the lower edge 18b side of the rear wall portion 18 is substantially narrowed to substantially narrow the portion. As a result, the volume of the airbag 15 at the completion of expansion can be reduced. Then, if the width dimension WU in the left-right direction on the upper 19 side of the rear wall portion 18 is set to a dimension that allows the occupant M to be appropriately received (see FIG. 2), the left wall portion 18 constitutes the rear wall portion 18. A configuration in which the width dimension WD in the left-right direction on the lower edges 43c and 53c of the rear panel 43 and the right rear panel 53 is narrowed, or the vicinity of the center 18bc on the lower edge 18b side of the rear wall portion 18 is pulled forward is a rear wall. Since the action of reducing the width dimension WU in the left-right direction of the upper portion 19 of the portion 18 does not occur, the occupant restraint area RA on the upper portion 19 side of the rear wall portion 18 can be sufficiently secured even if the volume is reduced. ..

Therefore, in the airbag 15 of the embodiment, the width dimension WU in the left-right direction of the occupant restraint area RA on the upper 19 side (upper edge 18a side) of the rear wall portion 18 at the time of completion of expansion is secured to reduce the volume. Can be done.

In the passenger seat airbag 15 of the embodiment, the lower wall portion 25 is configured by interconnecting the lower left panel 42 and the lower right panel 52, which are divided into two left and right, including the inflow opening 26. At the same time, the mutual connecting edges 42a and 52a of the lower left panel 42 and the lower right panel 52 are curved so as to approach each other and intersect with each other on the rear side of the portion of the inflow opening 26 in a flatly expanded state. The curved portions 42c and 52c, which are overlapped with each other, are arranged and configured.

Therefore, in the airbag 15 of the embodiment, the shape of the curved portion 29 in which the lower wall portion 25 bends downward on the rear side of the inflow opening 26 so as to bend the rear side downward from the front side when the expansion is completed. Can be secured, and it is easy to adhere to the upper surface 2 side of the instrument panel 1 on which the passenger seat airbag device SA is mounted in front of the passenger seat. Therefore, even if the lower edge 18b side of the rear wall portion 18 at the completion of expansion narrows the width dimension WU in the left-right direction, a wide area in contact with the instrument panel 1 can be secured, and when the occupant M is received, the reaction from the instrument panel 1 can be secured. Power can be secured accurately.

In this case, in the airbag 15 of the embodiment, the outer peripheral wall 16 is composed of a left side sheet material 38 and a right side sheet material 48 which are divided into two left and right. The left side sheet material 38 is configured to include the left side panel 40. Further, in the left side sheet material 38, the upper left panel 41 on the left side obtained by dividing the upper wall portion 21 into left and right is extended on the upper edge 31a side of the left side panel 40, and the rear edge side (rear side edge 40a) of the left side panel 40 is extended. The left rear panel 43 is extended to the upper part, and the lower left panel 42 is arranged and connected to the lower edge 31b side of the left panel 40.

Further, the right side sheet material 48 is configured to include the right side panel 50. Further, in the right side sheet material 48, the upper right panel 51 on the right side, which is the upper wall portion 21 divided into left and right, is extended on the upper edge 33a side of the right side panel 50, and the rear edge side (rear side edge 50a) of the right side panel 50 is extended. The right rear panel 53 is extended to the upper part, and the lower right panel 52 is arranged on the lower edge 33b side of the right side panel 50.

Therefore, in the airbag 15 of the embodiment, the lower left panel 42 forming the lower wall portion 25 and the right side have a shape having a curved portion 29 in which the rear side of the inflow opening 26 in the lower wall portion 25 curves downward when the expansion is completed. Even if the lower panel 52 is separated into left and right parts, the portions connected to the lower panel 52 are the left side sheet material 38 and the right side sheet material 48, and the airbag 15 itself is divided into left and right parts. That is, the entire airbag 15 is formed of two sheet materials having the minimum number of the left side sheet material 38 and the right side sheet material 48 for configuring the lower wall portion 25 so as to secure the curved shape. It is possible to reduce the number of places where predetermined edges are joined to each other, and it is possible to manufacture the airbag 15 with as few joining operations as possible.

In the embodiment, the case where the lower wall portion 25 is divided into left and right parts is shown, but as shown in FIG. 10, the lower left panel 42 and the lower right panel 52 are connected unless the curved portion 29 is formed. The airbag 15A may be formed from one sheet material 35 that has been made to form. In this sheet material 35, the lower left panel 42 and the lower right panel 52 are connected to each other, and the left panel 40A and the right panel 50A are connected in advance on both the left and right sides of the portion. .. An inflow opening 26 and a mounting hole 28 are arranged at a portion where the lower left panel 42 and the lower right panel 52 are connected, that is, a portion forming the lower wall portion 25.

Also in this airbag 15A, the rear panel constituting the rear wall portion 18 is composed of the left rear panel 43 and the right rear panel 53 divided into two left and right, and the left rear panel 43 and the right rear panel 53. The rear edge 40a of the left side panel 40A forming the left side of the lower wall portion 25 and the left wall portion 31 at the portions extending from the lower edge 18b side of the rear wall portion 18 to the left and right edges 18c and 18d. And the rear edge 50a of the right side panel 50A forming the right side of the lower wall portion 25 and the right wall portion 33. In the left rear panel 43 and the right rear panel 53, the portions of the rear wall portion 18 on the left and right edges 18c and 18d are formed in a straight line substantially parallel to the mutual dividing line SL, and the lower edges 43c and 53c are side. A curved shape (approximately 1/4 arc shape) that narrows the width dimension in the left-right direction is formed. The rear edge 40a of the left panel 40A and the rear edge 50a of the right panel 50A correspond to the left and right edges 18c and 18d of the rear wall portion 18 of the left rear panel 43 and the right rear panel 53, respectively. It includes linear portions 40b and 50b, and curved portions 40c and 50c corresponding to the lower edges 43c and 53c of the left rear panel 43 and the right rear panel 53. Further, the curved portions 40c and 50c of the rear side edge 40a of the left side panel 40A and the rear side edge 50a of the right side panel 50A form the left side panel 40A and the right side panel 50A, respectively, in the front-rear direction of the portion of the lower wall portion 25. The curve extending from the rear end portions 40d, 50d to the linear portions 40b, 50b connected to the lower ends 43e, 53e of the dividing line SL of the left rear panel 43 and the right rear panel 53 in a flatly developed state along the above. It is configured as a curve that projects the vicinity of the central portions 40e and 50e to the rear side from the rear end portions 40d and 50d.

Therefore, even in this airbag 15A, the curved lower edges 43c and 53c that narrow the width dimension in the left-right direction in the left rear panel 43 and the right rear panel 53 constituting the rear wall portion 18 are combined with the left panel 40A and the right panel 50A. It is configured to be connected to the curved portions 40c and 50c on the trailing edge side, and the curved portions 40c and 50c are connected to the lower ends 43e and 53e of the dividing line SL between the left rear panel 43 and the right rear panel 53. The vicinity of the central portions 40e and 50e of the curve extending from the end portions 40d and 50d to the linear portions 40b and 50b is a curve that protrudes rearward from the rear end portions 40d and 50d. Therefore, similarly to the airbag 15 of the embodiment, the lower edges 43c and 53c of the left rear panel 43 and the right rear panel 53 constituting the rear wall portion 18 narrow the width dimension in the left-right direction, and the rear wall portion 18 The volume of the left and right portions on the lower edge 18b side will be narrowed. Further, the left panel 40A and the right panel 50A are arranged so that the vicinity of the center 18bc of the lower edge 18b of the rear wall portion 18 formed by connecting the left rear panel 43 and the right rear panel 53 is arranged so as to be curved forward. Since it is coupled to the rear end portions 40d and 50d and pulled forward, the width dimension on the lower edge 18b side of the rear wall portion 18 is substantially narrowed, and the volume of that portion is narrowed. As a result, the volume of the airbag 15A at the completion of expansion can be reduced. Then, if the width dimension in the left-right direction on the upper 19 side of the rear wall portion 18 is set to a dimension that allows the occupant to be appropriately received, the left rear panel 43 and the right rear panel constituting the rear wall portion 18 are set. The configuration in which the width dimension in the left-right direction on the lower edge 43c and 53c side of 53 is narrowed or the vicinity of the center 18bc on the lower edge 18b side of the rear wall portion 18 is pulled forward is the configuration in which the upper portion 19 of the rear wall portion 18 is in the left-right direction. Since the effect of reducing the width dimension of the rear wall portion 18 is not generated, a sufficient occupant restraint area on the upper side of the rear wall portion 18 can be sufficiently secured even if the volume is reduced, which is the same as that of the airbag 15 of the embodiment. Actions and effects can be obtained.

Also in this sheet material 35, the linear portions 40b and 50b of the panels 40A and 50A are connected to the edges 43b and 53b of the panels 43 and 53, and the curved portions 40c and 50c of the panels 40A and 50A are connected to the panels 43 and 53. In addition to connecting to the edges 43c and 53c and joining (sewn) the edges 43d and 53d of the panels 43 and 53, the edges 41c and 43a, the edges 51c and 53a, and the edges 41a and 51a are joined (sewn) to each other. Further, if the edges 41d and 51d are joined (sewn) to the edges 42e and 52e, the outer peripheral wall 16 of the airbag 15A can be formed.

15, 15A ... (for passenger seat) airbag, 16 ... outer wall, 18 ... rear wall, 18a ... upper edge, 18b ... lower edge, 18c ... left edge, 18d ... right edge, 21 ... upper wall, 25 ... lower wall, 26 ... inflow opening, 29 ... curved, 31 ... left wall, 31a ... upper edge, 31b ... lower edge, 33 ... right wall, 33a ... upper edge, 33b ... lower edge,
38 ... Left sheet material, 40, 40A ... Left panel, 40a ... Rear edge, 40b ... Linear part, 40c ... Curved part, 40d ... Rear end part, 40e ... Central part, 41 ... Upper left panel, 41a ... Front Edge, 42 ... lower left panel, 42a ... joint edge, 42c ... curved part, 43 ... left rear panel, 43b ... left edge, 43c ... lower edge, 43e ... lower end,
48 ... right side sheet material, 50, 50A ... right side panel, 50a ... rear side edge, 50b ... linear part, 50c ... curved part, 50d ... rear end part, 50e ... central part, 51 ... upper right panel, 51a ... tip Edge, 52 ... lower right panel, 52a ... joint edge, 52c ... curved part, 53 ... right rear panel, 53b ... right edge, 53c ... lower edge, 53e ... lower end,
SL ... split line, M ... occupant, H ... head.

Claims (3)

The outer peripheral wall at the time of completion of expansion extends forward from the rear wall portion that receives the occupant, the upper wall portion that extends forward from the upper edge of the rear wall portion, and the upper wall portion that extends forward from the lower edge of the rear wall portion. From the left edge of the rear wall portion to the lower wall portion which is connected to the wall portion and has an inflow opening for allowing the expansion gas to flow in, the upper and lower edges are connected to the upper wall portion and the lower wall portion. It is configured to include a left wall portion extending forward and a right wall portion extending forward from the right edge of the rear wall portion while connecting upper and lower edges to the upper wall portion and the lower wall portion. ,
The rear panel constituting the rear wall portion is a passenger seat airbag composed of a left rear panel and a right rear panel divided into left and right.
The left rear panel and the right rear panel
The portions extending from the lower edge side of the rear wall portion to the left and right edge sides are the rear edge of the left panel forming the left side of the lower wall portion and the left wall portion, and the right side and the right side of the lower wall portion. In addition to being configured to be connected to the rear side edge of the right panel that forms the wall,
The portions on the left and right edges of the rear wall portion are formed into a straight line substantially parallel to the mutual dividing lines, and a curved shape that narrows the width dimension in the left-right direction toward the lower edge side.
The rear edge of the left panel and the rear edge of the right panel are linear portions corresponding to the left and right edge sides of the rear wall portion of the left rear panel and the right rear panel, respectively, and the left rear. It is provided with a curved portion corresponding to the lower edge side of the panel and the right rear panel, and is provided with.
The curved portion of the rear edge of the left panel and the rear edge of the right panel flatten the left panel and the right panel, respectively, along the portion of the lower wall portion in the front-rear direction. In the unfolded state, the vicinity of the center of the curve extending from the rear end portion connected to the lower end of the dividing line between the left rear panel and the right rear panel to the linear portion is projected to the rear side from the rear end portion. A passenger airbag characterized by being configured as a curve. The lower wall portion, including the inflow opening, is configured by interconnecting the lower left panel and the lower right panel, which are divided into two parts on the left and right.
A curved portion, which is curved so as to intersect with each other and overlaps with each other, is provided on the rear side of the portion of the inflow opening in a state where the connecting edges of the lower left panel and the lower right panel are spread flat. The passenger seat airbag according to claim 1, wherein the airbag is configured to be made of a passenger seat. The outer wall is composed of a left side sheet material and a right side sheet material that are divided into two parts on the left and right.
The left sheet material is
In addition to being configured with the left panel
The left upper left panel, which is the upper wall portion divided into left and right, is extended on the upper edge side of the left panel, and the left rear panel is extended on the upper part of the rear edge side of the left panel, and the lower side of the left panel is extended. It is configured by arranging the lower left panel on the veranda.
The right sheet material is
In addition to being configured with the right panel
The right upper right panel, which is the upper wall portion divided into left and right, is extended to the upper edge side of the right panel, and the right rear panel is extended to the upper part of the rear edge side of the right panel, and is below the right panel. The passenger seat airbag according to claim 2, wherein the lower right panel is arranged on the veranda.

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