WO2019244763A1 - Airbag device - Google Patents

Airbag device Download PDF

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Publication number
WO2019244763A1
WO2019244763A1 PCT/JP2019/023456 JP2019023456W WO2019244763A1 WO 2019244763 A1 WO2019244763 A1 WO 2019244763A1 JP 2019023456 W JP2019023456 W JP 2019023456W WO 2019244763 A1 WO2019244763 A1 WO 2019244763A1
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WO
WIPO (PCT)
Prior art keywords
airbag
portions
inflatable
pair
seat
Prior art date
Application number
PCT/JP2019/023456
Other languages
French (fr)
Japanese (ja)
Inventor
坂本　浩
匡俊 横田
岡田　典久
伸一 竹内
Original Assignee
Ｊｏｙｓｏｎ Ｓａｆｅｔｙ Ｓｙｓｔｅｍｓ Ｊａｐａｎ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｊｏｙｓｏｎ Ｓａｆｅｔｙ Ｓｙｓｔｅｍｓ Ｊａｐａｎ株式会社 filed Critical Ｊｏｙｓｏｎ Ｓａｆｅｔｙ Ｓｙｓｔｅｍｓ Ｊａｐａｎ株式会社
Publication of WO2019244763A1 publication Critical patent/WO2019244763A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/427—Seats or parts thereof displaced during a crash
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/207—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components in vehicle seats
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration

Definitions

  • the present disclosure relates to an airbag device.
  • the airbag in the configuration in which the airbag is deployed from the headrest or the seat back, it is necessary to cross the headrest or the occupant's head in order to deploy the airbag forward of the head, and the airbag may not be deployed properly.
  • the present disclosure aims to provide an airbag device that can stably deploy an airbag.
  • An airbag device includes an inflator and an airbag that is deployed by gas supplied from the inflator, and the airbag is a rear inflatable portion that is deployed on a back side of a seat.
  • a pair of lateral inflatable portions extending forward from both sides of the rear inflatable portion in the seat width direction; and a pair of frontal portions extending from the pair of lateral inflatable portions toward the center and interconnected at the center to cover the front of the occupant.
  • a gas flow path is formed in the airbag in the order of the rear inflation portion, the side inflation portion, and the front inflation portion.
  • an airbag device capable of stably deploying an airbag.
  • FIG. 2 is a perspective view of the airbag device according to the embodiment when the airbag is deployed. It is a side view of the airbag apparatus shown in FIG. It is a front view of the airbag apparatus shown in FIG.
  • FIG. 4 is a schematic diagram showing a schematic configuration of the airbag in FIGS. 1 to 3 in a plan view. It is a top view of the outer panel which comprises an airbag. It is a top view of the inner panel which comprises an airbag. It is a top view of a reinforcement patch which constitutes an airbag.
  • FIG. 3 is a plan view of a base fabric pipe constituting the airbag. FIG. 3 is a side view of the airbag device according to the embodiment when the airbag is stored.
  • FIG. 3 is a plan view of a base fabric pipe constituting the airbag.
  • FIG. 10 is an enlarged view of the vicinity of a storage unit in FIG. 9. It is a figure showing the 1st stage of the deployment procedure of the airbag by the airbag device concerning an embodiment. It is a figure showing the 2nd stage of the deployment procedure of the airbag by the airbag device concerning an embodiment. It is a figure showing the 3rd step of the deployment procedure of the airbag by the airbag device concerning an embodiment. It is a figure showing the 4th step of the deployment procedure of the airbag by the airbag device concerning an embodiment. It is a figure showing the 5th step of the deployment procedure of the airbag by the airbag device concerning an embodiment. It is a schematic diagram which shows the schematic structure of the planar view of the airbag which concerns on a 1st modification. It is a schematic diagram which shows the schematic structure of the planar view of the airbag which concerns on a 2nd modification.
  • the x direction is the front-back direction of the vehicle
  • the x positive direction side is the vehicle front
  • the x negative direction side is the vehicle rear
  • the y direction is the width direction of the vehicle
  • the y positive direction side is the vehicle right side
  • the y negative direction side is the vehicle left side.
  • the z direction is the vertical direction, with the z positive direction side being upward and the z negative direction side being downward.
  • FIG. 1 is a perspective view of the airbag device 10 according to the embodiment when the airbag is deployed.
  • FIG. 2 is a side view of the airbag device 10 shown in FIG.
  • FIG. 3 is a front view of the airbag device 10 shown in FIG.
  • FIG. 4 is a schematic diagram showing a schematic configuration of the airbag 20 in FIGS. 1 to 3 in plan view.
  • the airbag device 10 is mounted on a seat 60 of a vehicle.
  • the seat 60 includes a seat portion 61 on which the occupant D sits, a seat back 62 having a lower end connected to a rear end of the seat portion 61, and a headrest 63 provided at an upper end of the seat back 62.
  • a frame 64 is arranged inside the seat back 62.
  • the seat 60 is also provided with general components mounted on the vehicle seat, such as a seat belt, a tongue, a buckle, and a retractor.
  • a front seat on the right side of the vehicle is illustrated as the seat 60 on which the airbag device 10 is mounted.
  • the y positive direction side is the vehicle outside
  • the y negative direction side is the vehicle inside.
  • the airbag device 10 protects the occupant D from collision in all directions, front, rear, right and left, by the deployed airbag 20 in a state where the occupant D is seated on the seat 60.
  • the airbag 20 is formed in a tubular shape that covers the headrest 63 of the seat 60 and the periphery of the head H of the occupant D seated on the seat 60 and is open at the top and bottom.
  • FIGS. 1 to 4 show a state in which a dummy doll for a collision test is seated on the seat portion 61 of the seat 60 as a model of the occupant D to be protected.
  • the dummy doll is, for example, WorldSID (International Unified Side Impact Dummy: World @ Side @ Impact @ Dummy) AM50 (50th percentile of American adult males).
  • the dummy doll is seated in a standard sitting posture (regular state) determined by the collision test method, and the seat 60 is located at a reference setting position corresponding to the sitting posture.
  • the head of the dummy doll H faces the front of the vehicle (the front side of the seat 60).
  • the airbag device 10 includes an airbag 20, an inflator 30, and a housing 40.
  • the inflator 30 and the housing section 40 will be described later with reference to FIGS.
  • the airbag 20 is configured as a tubular integral bag that is inflated and deployed so as to cover the head H of the occupant D from the front and both left and right sides. More specifically, the airbag 20 has a rear inflation portion 21, a pair of side inflation portions 22A and 22B, and a pair of front inflation portions 23A and 23B.
  • the rear inflatable portion 21 is deployed at a position behind the headrest 63 so as to face the headrest 63 and the seat back 62 as shown in FIGS. As shown in FIG. 4, the rear inflatable portion 21 is connected to the rear end of the pair of lateral inflatable portions 22A and 22B via rear bent portions 74A and 74B at both ends in the y direction. .
  • the rear bent portions 74A and 74B are bent at substantially right angles to the x positive direction side to extend the pair of side expanding portions 22A and 22B forward from the rear expanding portion 21 as shown in FIGS. .
  • the pair of lateral expansion portions 22A and 22B are respectively disposed on the left and right sides of the head H of the occupant D.
  • the pair of lateral expansion portions 22A and 22B are formed such that the front side has a longer dimension in the vertical direction than the rear side and is longer than the lower side.
  • the length of the front side is substantially the same as the vertical dimension of the front expansion portions 23A and 23B.
  • the top parts 29A and 29B which protrude above other parts are provided in the upper part of a pair of side expansion parts 22A and 22B, respectively.
  • the crowns 29A, 29B are formed at a height that can contact the ceiling of the vehicle compartment. For example, as shown in FIG. 3, the ceiling position in the vehicle interior is often higher on the vehicle center side than on the vehicle outer side. In such a case, the height of the crown portion 29A on the vehicle outer side is adjusted according to the ceiling shape. It is formed lower than the central crown 29B. Thereby, the amount of contact between the crowns 29A and 29B and the ceiling can be adjusted to be substantially equal, and the deployment behavior of the airbag 20 can be stabilized.
  • the pair of side inflatable portions 22A, 22B are connected to the pair of front inflatable portions 23A, 23B via front bent portions 75A, 75B at front end portions.
  • the front bent portions 75A and 75B are bent at a substantially right angle toward the center in the y direction, and cover a pair of front expanding portions 23A and 23B in front of the head H of the occupant D as shown in FIGS.
  • the pair of front inflatable portions 23A and 23B are joined to each other along the z-direction at a substantially central position in the y-direction by a central joining portion 76, whereby the front inflatable portions 23A and 23B are arranged in front of the head H of the occupant D,
  • the front of the portion H can be completely closed.
  • the pair of front inflatable portions 23A and 23B are formed in a substantially rectangular shape when viewed from the x direction, and have dimensions in the width direction and the vertical direction that can cover the entire front surface of the head H of the occupant D. ing.
  • the airbag 20 is formed by joining the both ends of the integral bag body by the joining seam by the central joint portion 76, so that the donut which surrounds the head H of the occupant D in all directions in the front-rear direction and the left-right direction. It is formed in a shape.
  • the front inflatable portions 23A and 23B are recessed forward in the y-direction substantially central portions of the front inflatable portions 23A and 23B when viewed from the occupant D side by arranging the center joint portion 76 at the center in the width direction.
  • a front recess 27 is formed.
  • the front recess 27 extends in the z-direction over the area of the central joint 76.
  • the presence of the front recess 27 on the inner surfaces of the front inflatable portions 23A and 23B increases the contact surface of the inner surfaces of the front inflatable portions 23A and 23B with the head H, and also makes the opposing angles diversified.
  • the direction in which the airbag 20 can absorb the impact on the side can be increased, and the occupant D can be protected from a collision in a wider direction.
  • the upper ends of the front inflatable portions 23A and 23B may be located above the top of the head H of the occupant D.
  • the lower end position is provided so as to cover the chest of the occupant D in the present embodiment, but may be a position that can cover at least the head H of the occupant D. It may be shorter than the dimensions of the illustrated embodiment.
  • the pair of front inflatable portions 23A and 23B have restraining portions 24A and 24B and energy absorbing (Energy Absorption: EA) portions 25A and 25B.
  • the constraining portions 24A and 24B bend and extend to the center side from the pair of lateral expansion portions 22A and 22B, respectively.
  • the EA portions 25A, 25B are connected to the center-side ends of the restraining portions 24A, 24B, and extend from the center portion to the front bent portions 75A, 75B on both sides in the y direction, thereby forming the restraining portions 24A, 24B. It is arranged to overlap on the front side.
  • the outer ends of the EA portions 25A, 25B are joined to the pair of lateral inflatable portions 22A, 22B by tip joint portions 77A, 77B provided at the front end of the pair of lateral inflatable portions 22A, 22B.
  • the pair of EA portions 25A, 25B are arranged in the y direction in front of the restraining portions 24A, 24B, and are arranged in parallel with the restraining portions 24A, 24B, and the restraining portions 24A, 24B and the EA portion are arranged.
  • 25A and 25B are arranged in front of the head H of the occupant D in a double manner.
  • the restraint portions 24A and 24B of the front inflatable portions 23A and 23B are arranged in front of the head H of the occupant D and function to protect the front side of the head H in the event of a collision.
  • the EA portions 25A and 25B limit the load applied to the restraint portions 24A and 24B of the airbag 20 when a secondary collision such as the collision of the airbag 20 with a handle or the like in front of the seat is applied to the occupant. It functions to absorb and mitigate energy.
  • the inflator 30 is attached to the inflator insertion port 26 of the rear inflating portion 21, and gas from the inflator 30 is supplied.
  • a gas flow path is formed in the order from the rear inflating portion 21 to one side inflating portion 22A, one restricting portion 24A, and one EA portion 25A.
  • a gas flow path is formed in the order of the inflating portion 22B, the other restraining portion 24B, and the other EA portion 25B.
  • FIG. 5 is a plan view of the outer panel 51 constituting the airbag 20.
  • FIG. FIG. 6 is a plan view of the inner panel 52 constituting the airbag 20.
  • FIG. FIG. 7 is a plan view of the reinforcing patch 53 constituting the airbag 20.
  • FIG. FIG. 8 is a plan view of the base fabric pipe 54 constituting the airbag 20.
  • FIG. 5 to FIG. 9 are exploded views of each part constituting the airbag 20.
  • the airbag 20 includes an outer panel 51, an inner panel 52, a reinforcing patch 53, and a base cloth pipe.
  • the outer panel 51 and the inner panel 52 are overlapped and sewn along the outer peripheral sewing line 56 at the peripheral edge to form an integral bag.
  • the outer panel 51 and the inner panel 52 have a rear inflatable portion 21 in the center, a pair of lateral inflatable portions 22A, 22B on both sides, and a pair of front inflatable portions 23A, 23B on both sides. EA portions 25A and 25B are arranged further outside.
  • the outer panel 51 forms an outer surface facing outward when the airbag 20 is deployed
  • the inner panel 52 forms an inner surface facing the center head H side when the airbag 20 is deployed.
  • a plurality of circular sewing portions 55A and 55B sewn in a circular shape are provided between the rear expanding portion 21 and the lateral expanding portions 22A and 22B, and join the outer panel 51 and the inner panel 52. Since the bending of the bag body is promoted by these circular stitch portions 55A and 55B, the rear bent portions 74A and 74B are formed. Further, by partially joining the outer panel 51 and the inner panel 52 with the circular stitch portions 55A and 55B, the capacity of the airbag 20 can be reduced.
  • a left sewing line 58 and a right sewing line 59 are provided between the lateral expansion portions 22A, 22B of the outer panel 51 and the restraining portions 24A, 24B, thereby forming front bending portions 75A, 75B. .
  • a front sewing line 57A sewn annularly at the center in the height direction is provided between the restraining portion 24A and the EA portion 25A, and joins the outer panel 51 and the inner panel 52.
  • a front sewing line 57B sewn annularly at the center in the height direction is provided between the restraining portion 24B and the EA portion 25B, and joins the outer panel 51 and the inner panel 52.
  • the area surrounded by the front sewing lines 57A and 57B is a non-inflating portion that does not inflate even when the airbag 20 is operated. Both sides in the height direction of the non-inflated portion serve as flow paths for passing gas from the restraining portions 24A, 24B to the EA portions 25A, 25B.
  • a plurality of (three in this embodiment) circular sewing portions 55E are provided at substantially equal intervals along the height direction in a region surrounded by the front sewing lines 57A and 57B.
  • the circular sewing portion 55E sewes the outer panel 51, the inner panel 52 on the side of the front expanding section 23A, the outer panel 51 on the side of the front expanding section 23B, and the inner panel 52, and joins them together. ing.
  • a central joint portion 76 is formed between the pair of front inflatable portions 23A and 23B.
  • ⁇ Sewing lines 58 and 59 are also provided at outer end portions of the EA portions 25A and 25B, respectively, and are joined to the distal end joining portions 77A and 77B.
  • a pair of circular sewing patches 55C, 55D are provided along the front-rear direction at substantially the center in the height direction of the lateral expansion portions 22A, 22B.
  • circular sewing patches 55C and 55D circular patches are arranged outside the outer panel 51 and the inner panel 52, and the patches are sewn between the outer panel 51 and the inner panel 52, and the outer panel 51 and the inner panel 52 are sewn.
  • the panel 52 is joined.
  • the circular sewing patches 55C and 55D can reinforce the sewn portion by arranging the patches on the outside.
  • a pair of circular sewing patches 55C and 55D provided along the front and rear direction is sewn linearly along the front and rear direction, thereby forming the side expansion portions 22A and 22B.
  • the thickness of the airbag 20 when inflated is regulated.
  • the circular stitching patches 55C are also provided on the upper side and the lower side of the pair of circular stitching patches 55C on the rear side in the front-rear direction. That is, an area where three circular sewing patches 55C are provided in the height direction is formed. In this region, the thickness when the airbag 20 is inflated is further suppressed as compared with the other regions.
  • the side inflating portion 22A is disposed outside the vehicle, and a part thereof faces the B pillar.
  • a plurality of (three in this embodiment) circular sewing patches 55C are arranged along the height direction at a position facing the B pillar in the side inflated portion 22A, so that the The thickness of a portion of the inflatable portion 22A facing the B pillar is locally suppressed so that interference between the airbag 20 and the B pillar can be avoided.
  • a plurality (two in the present embodiment) of circular sewing patches 55F and 55G are provided along the height direction at a substantially central portion in the width direction of the EA portions 25A and 25B, and the outer panel 51 and the inner panel 52 are provided. Are joined. This regulates the thickness of the EA portions 25A and 25B in the front-rear direction when the airbag is inflated.
  • the circular sewing portions 55A, 55B, and 55E may be provided with circular sewing patches.
  • the reinforcing patch 53 has the same shape as that shown in FIG. 7, and is disposed outside the rear inflating portion 21 of the outer panel 51 and the inner panel 52, and is connected to the outer panel 51 by a patch sewing line 73. Each is joined to the inner panel 52.
  • the base fabric pipe 54 is inserted into the inflator insertion opening 26 in a state where the base fabric pipe 54 is attached to the distal end of the inflator 30.
  • the inflator insertion opening 26 is provided in the rear inflatable portion 21 of the airbag 20 as shown in FIGS.
  • the sewing order of the airbag 20 is, for example, (1) outer peripheral sewing line 56, (2) front sewing line 57 (central joint portion 76), (3) left sewing line 58 (tip joint portion 77B), and (4) right side.
  • the order of the sewing line 59 (the distal end joint portion 77A) can be set.
  • FIG. 9 is a side view of the airbag device 10 according to the embodiment when the airbag is housed.
  • FIG. 10 is an enlarged view of the vicinity of the storage section 40 in FIG.
  • the airbag 20 is stored in the storage section 40 in a folded state.
  • the accommodation section 40 is attached to a frame 64 inside the seat back 62 and stored in the seat back 62, for example.
  • the accommodation section 40 is disposed so as to open upward along the direction in which the seat back 62 extends.
  • the inflator 30 is disposed below the storage section 40, and is inserted into the inflator insertion opening 26 of the airbag 20 from below the storage section.
  • the inflator insertion opening 26 penetrates, for example, the bottom wall of the housing section 40 and advances downward, and the inflator 30 is inserted.
  • the inflator 30 is, for example, of a combustion type or a cold gas type, and its operation is controlled by a control device such as a vehicle ECU.
  • the inflator 30 supplies gas generated by the operation into the airbag 20 through the inflator insertion port 26.
  • the inflator 30 is, for example, a cylinder-type inflator, and is arranged with the height direction of the seat as a longitudinal direction.
  • the inflator 30 is fixed to a bracket 31 fixed to a frame 64 by using a band 32, for example, as shown in FIG.
  • a band 32 for example, as shown in FIG.
  • two inflator insertion ports 26 are provided in the rear inflatable portion 21 and two inflators 30 are installed as shown in FIG. 4, but the number of inflators 30 may be one or two. A larger number may be used.
  • the accommodation section 40 is made of, for example, resin and is formed in a box shape, and has an upper side opened.
  • the folded airbag 20 is accommodated in the box-shaped internal space of the accommodation section 40.
  • the storage section 40 is stored above the seat back 62 when the airbag device 10 is not operated. When the airbag device 10 is operated, the surface of the seat back 62 is broken by the inflation pressure of the airbag 20, so that the airbag 20 can be inflated and deployed to the outside.
  • the airbag 20 housed in the housing unit 40 is configured to include a roll folded part 71 folded in a roll shape and a bellows folded part 72 folded in a bellows shape.
  • the roll folded portion 71 is folded into a roll so as to wind upward from the front inflatable portions 23A, 23B side to the upper surface side of the lateral inflatable portions 22A, 22B in the deployed state of the airbag 20.
  • the seat is folded so that it can be easily deployed toward the front of the seat when inflated and deployed.
  • the bellows folded portion 72 is accommodated in a position above the roll folded portion 71 of the accommodation portion 40 in a state where the rear inflating portion 21 in the deployed state of the airbag 20 is folded in a bellows shape. It is easy to deploy before the part 71.
  • the inflator insertion opening 26 of the airbag 20 is not included in the roll folded portion 71 and the bellows folded portion 72, but is disposed below the roll folded portion 71, and the inflator 30 is inserted.
  • FIG. 10 for convenience of schematically showing the storage state of the roll folded portion 71 and the bellows folded portion 72, it is illustrated as branched from the inflator insertion opening 26 to both the roll folded portion 71 and the bellows folded portion 72.
  • the inflator insertion port 26 is provided in the rear inflatable portion 21 as described above, it is actually connected only to the bellows folded portion 72. For this reason, the roll folding part 71 and the bellows folding part 72 can supply gas to the bellows folding part 72 above first.
  • the roll folding section 71 supplies the gas in the order of the side inflating sections 22A and 22B and the front inflating sections 23A and 23B so that the side inflating sections 22A and 22B are positioned above the head H of the occupant D. And the front inflatable portions 23A and 23B are inflated and deployed at a position forward of the head H of the occupant D.
  • FIGS. FIG. 11 to FIG. 15 are diagrams respectively showing first to fifth stages of the deployment procedure of the airbag 20 by the airbag device 10 according to the embodiment.
  • the airbag 20 is folded and stored in the storage portion 40 in the seed bag. Then, when a shock equal to or more than a predetermined threshold is received due to a vehicle collision or the like, the inflator 30 is operated by the ECU, and gas is started to be supplied from the inflator 30 to the airbag 20.
  • the gas is first supplied to the bellows folded portion 72 at the upper part and starts to expand.
  • the bellows folded portion 72 breaks the surface of the seat back 62 while developing the bellows shape, advances to the seat rear side, and starts to expand upward and to the seat rear side.
  • the rear expanding portion 21 is formed. Thereafter, when the gas starts to be supplied to the roll folding section 71, the roll folding section 71 starts to expand from the state of being folded in the roll shape so as to be developed. At this time, the roll folding portion 71 receives a reaction force from the rear expanding portion 21 deployed on the seat rear side to the front and upper sides of the vehicle due to the expanding force generated by the expansion. By this reaction force, the roll folding part 71 is deployed so as to get over the headrest 63 diagonally upward. That is, the rear inflation portion 21 which is first developed functions as a base for promoting the deployment direction of the roll folding portion 71 forward. Moreover, since the roll folding part 71 is wound upward, as described above, it is rotated downward and deployed.
  • the expansion of the roll folding portion 71 proceeds, and first, the side expansion portions 22A and 22B start to expand. The lateral expansion portions 22A and 22B expand upward, and the remaining portion of the roll folding portion 71 is deployed forward along the ceiling of the vehicle.
  • the side inflatable portions 22A and 22B are formed from the roll folding portion 71 to cover the side of the head H of the occupant D.
  • the remaining portion of the roll folded portion 71 has advanced forward from the head H, and the top portions 29A and 29B of the side inflatable portions 22A and 22B abut against the ceiling, and the upward force due to the reaction force from the ceiling.
  • the deployment direction is switched downward and begins to deploy downward from the vehicle ceiling.
  • the front inflated portions 23A and 23B are formed from the roll folded portion 71, and also cover the front portion of the head H of the occupant D, whereby the occupant D can move in all directions in the front-rear and left-right directions.
  • An overlying airbag 20 is formed.
  • the airbag device 10 of the present embodiment includes an inflator 30 and an airbag 20 that is deployed by gas supplied from the inflator 30.
  • the airbag 20 includes a rear inflatable portion 21 deployed on the back side of the seat 60, a pair of side inflatable portions 22A and 22B extending forward from both sides in the seat width direction of the rear inflatable portion 21, and a pair of side inflatable portions 22A. , 22B extending to the center side and connected to each other at the center to cover the front of the occupant D.
  • a gas flow path is formed in the order of the rear inflating portion 21, the side inflating portions 22A and 22B, and the front inflating portions 23A and 23B.
  • the rear inflatable portion 21 when the airbag 20 is inflated and deployed when the airbag device 10 is operated, the rear inflatable portion 21 can be first deployed. Accordingly, as described with reference to FIG. 12, the rear inflatable portion 21 is first developed and the rear inflatable portion 21 functions as a base for promoting the deployment direction of the remaining portion to the front. It is possible to provide the inflating airbag 20 with an inflation force and a deployment direction sufficient to pass over the head H of the occupant D. Further, by forming the gas flow paths in the order of the side inflating portions 22A and 22B and the front inflating portions 23A and 23B, as described with reference to FIG. 14, the side inflating portions 22A and 22B are formed first.
  • the front inflatable portions 23A and 23B can be deployed. Thereby, the airbag 20 can be deployed so as to reliably exceed the headrest 63 and the head H of the occupant D. As a result, the airbag device 10 of the present embodiment can stably deploy the airbag 20.
  • the airbag 20 is configured such that the gas from the inflator is supplied to the rear inflatable portion 21, and the rear inflatable portion 21 is located ahead of the side inflatable portions 22A and 22B and the front inflatable portions 23A and 23B. Will be expanded to.
  • the rear inflatable portion 21 can be more reliably deployed earlier than the side inflatable portions 22A, 22B and the front inflatable portions 23A, 23B, and the deployment operation of the airbag 20 can be further stabilized.
  • the front inflatable portions 23A, 23B extend from the pair of side inflatable portions 22A, 22B to the center side and are mutually connected at the center to form a pair of restraining portions that cover the front of the occupant. 24A and 24B, and a pair of energy absorption (EA) portions 25A and 25B extending forward and left and right outward from the pair of restraining portions 24A and 24B, respectively, and covering the front surfaces of the restraining portions 24A and 24B.
  • EA energy absorption
  • the front inflatable portions 23A and 23B can alleviate the impact of the occupant D at the time of the collision by the restraining portions 24A and 24B, and absorb the impact at the time of the collision with the steering wheel in front of the seat by the EA portions 25A and 25B.
  • the occupant D can be prevented from being transmitted to the occupant D, and the occupant D can be protected twice.
  • the shape of the airbag 20 of the airbag device 10 of the present embodiment can be paraphrased as follows. That is, the airbag 20 includes a rear inflatable portion 21 deployed on the rear side of the seat 60, a pair of side inflatable portions 22 ⁇ / b> A, 22 ⁇ / b> B extending forward from both sides of the rear inflatable portion 21 in the seat width direction, and a pair of side inflatable portions. Front inflatable portions 23A and 23B connected to the portions 22A and 22B to cover the front of the occupant D. The front inflatable portions 23A and 23B are provided with stitches (front sewing) extending along the up-down direction (z direction) of the seat 60 at substantially the center of the seat 60 in the width direction (y direction) of the inner surface on the occupant D side.
  • a line 57 is provided, and the seam forms the front recess 27 which is recessed forward. More specifically, the pair of front inflatable portions 23A and 23B are joined to each other along the z direction by joining stitches forming a central joint portion 76 at a substantially central position in the y direction, thereby forming the front concave portion 27. Have been.
  • the contact surfaces of the inner surfaces of the front inflatable portions 23A and 23B of the airbag 20 with the head H are widened, and the opposing angles are also diversified, so that the airbag 20 can absorb shock at the vehicle front side.
  • the direction can be increased, and the occupant D can be protected from a collision in a wider direction.
  • the airbag 20 is formed in the donut shape shown in FIG. 4 by joining the widthwise centers of the pair of front inflatable portions 23A and 23B by joining stitching, so that the airbag 20 is supplied from the inflator 30.
  • the left and right gas can be easily spread evenly from side to front of the airbag 20. Thereby, the deployment of the airbag 20 can be further stabilized.
  • FIG. 16 is a schematic diagram illustrating a schematic configuration of the airbag 120 according to a first modification of the present embodiment in plan view.
  • FIG. 17 is a schematic diagram illustrating a schematic configuration of an airbag 220 according to a second modification of the present embodiment in plan view.
  • the shape of the airbag 20 is not limited to the above embodiment.
  • the second EA portions 28A and 28B may be provided further on the distal end side of the EA portions 25A and 25B.
  • the front inflatable portions 123A and 123B expand in a substantially triangular shape when viewed from above.
  • the front inflatable portions 223A and 223B may not have the EA portions 25A and 25B.
  • the configuration in which the storage unit 40 of the airbag device 10 is stored in the seatback 62 has been described, but the configuration in which the storage unit 40 is stored in the headrest 63 may be used.
  • the airbag 20 has a structure in which a plurality of panels are sewn and integrally formed.
  • the airbag 20 may be a so-called one-piece woven (OPW) type.
  • Airbag apparatus 20 120, 220 Airbag 21 Rear inflation part 22A, 22B Side inflation part 23A, 23B, 123A, 123B, 223A, 223B Front inflation part 24A, 24B Restraining part 25A, 25B EA part 26 Inflator insertion port 27 Front recess 28A, 28B 2nd EA part 29A, 29B Head part 30 Inflator 40 Housing part 71 Roll folding part 72 Bellows folding part 60 Seat 61 Seat 62 Seat back 63 Headrest 64 Frame D Occupant H Head

Abstract

An airbag device (10) comprising: an inflator (30); and an airbag (20) which is expanded by means of a gas supplied from the inflator (30). The airbag comprises: a rear inflation part (21) which expands at the rear surface side of a seat (60); a pair of lateral inflation parts (22A, 22B) which extend forwards from the respective sides of the rear inflation part (21) in the widthwise direction of the seat (60); and a pair of front inflation parts (23A, 23B) which respectively extend from the lateral inflation parts (22A, 22B) toward the centre, and connect with one another at the centre, covering the front of a passenger. A gas flow channel is formed in the airbag (20) in the order: rear inflation part (21), lateral inflation parts (22A, 22B), and front inflation parts (23A, 23B).

Description

エアバッグ装置Airbag device
　本開示は、エアバッグ装置に関する。 The present disclosure relates to an airbag device.
　従来、車両の座席のヘッドレストやシートバックからエアバッグを展開して、このエアバッグにより座席に着座している乗員の頭部の全方位を保護する手法が提案されている（例えば特許文献１）。 2. Description of the Related Art Conventionally, a method has been proposed in which an airbag is deployed from a headrest or a seatback of a vehicle seat, and the head of an occupant sitting on the seat is protected in all directions by the airbag (for example, Patent Document 1). .
特開２０１７－１００６８８号公報JP 2017-100688 A
　しかし、ヘッドレストやシートバックからエアバッグを展開する構成では、頭部前方にエアバッグを展開するためにヘッドレストや乗員の頭部を越える必要があり、エアバッグがうまく展開できない場合がある。 However, in the configuration in which the airbag is deployed from the headrest or the seat back, it is necessary to cross the headrest or the occupant's head in order to deploy the airbag forward of the head, and the airbag may not be deployed properly.
　本開示は、エアバッグを安定して展開できるエアバッグ装置を提供することを目的とする。 The present disclosure aims to provide an airbag device that can stably deploy an airbag.
　本発明の実施形態の一観点に係るエアバッグ装置は、インフレータと、前記インフレータから供給されるガスにより展開するエアバッグと、を備え、前記エアバッグは、シートの背面側に展開する後方膨張部と、前記後方膨張部のシート幅方向両側から前方に延びる一対の側方膨張部と、前記一対の側方膨張部から中央側へ延び中央で相互に連結されて乗員の前方を覆う一対の前方膨張部と、を有し、前記エアバッグは、前記後方膨張部、前記側方膨張部、前記前方膨張部の順でガス流路が形成される。 An airbag device according to one aspect of an embodiment of the present invention includes an inflator and an airbag that is deployed by gas supplied from the inflator, and the airbag is a rear inflatable portion that is deployed on a back side of a seat. A pair of lateral inflatable portions extending forward from both sides of the rear inflatable portion in the seat width direction; and a pair of frontal portions extending from the pair of lateral inflatable portions toward the center and interconnected at the center to cover the front of the occupant. And a gas flow path is formed in the airbag in the order of the rear inflation portion, the side inflation portion, and the front inflation portion.
　本開示によれば、エアバッグを安定して展開できるエアバッグ装置を提供することができる。 According to the present disclosure, it is possible to provide an airbag device capable of stably deploying an airbag.
実施形態に係るエアバッグ装置のエアバッグ展開時の斜視図である。FIG. 2 is a perspective view of the airbag device according to the embodiment when the airbag is deployed. 図１に示すエアバッグ装置の側面図である。It is a side view of the airbag apparatus shown in FIG. 図１に示すエアバッグ装置の正面図である。It is a front view of the airbag apparatus shown in FIG. 図１～３中のエアバッグの平面視の概略構成を示す模式図である。FIG. 4 is a schematic diagram showing a schematic configuration of the airbag in FIGS. 1 to 3 in a plan view. エアバッグを構成するアウターパネルの平面図である。It is a top view of the outer panel which comprises an airbag. エアバッグを構成するインナーパネルの平面図である。It is a top view of the inner panel which comprises an airbag. エアバッグを構成する補強パッチの平面図である。It is a top view of a reinforcement patch which constitutes an airbag. エアバッグを構成する基布パイプの平面図である。FIG. 3 is a plan view of a base fabric pipe constituting the airbag. 実施形態に係るエアバッグ装置のエアバッグ収納時の側面図である。FIG. 3 is a side view of the airbag device according to the embodiment when the airbag is stored. 図９中の収容部近傍の拡大図である。FIG. 10 is an enlarged view of the vicinity of a storage unit in FIG. 9. 実施形態に係るエアバッグ装置によるエアバッグの展開手順の第１段階を示す図である。It is a figure showing the 1st stage of the deployment procedure of the airbag by the airbag device concerning an embodiment. 実施形態に係るエアバッグ装置によるエアバッグの展開手順の第２段階を示す図である。It is a figure showing the 2nd stage of the deployment procedure of the airbag by the airbag device concerning an embodiment. 実施形態に係るエアバッグ装置によるエアバッグの展開手順の第３段階を示す図である。It is a figure showing the 3rd step of the deployment procedure of the airbag by the airbag device concerning an embodiment. 実施形態に係るエアバッグ装置によるエアバッグの展開手順の第４段階を示す図である。It is a figure showing the 4th step of the deployment procedure of the airbag by the airbag device concerning an embodiment. 実施形態に係るエアバッグ装置によるエアバッグの展開手順の第５段階を示す図である。It is a figure showing the 5th step of the deployment procedure of the airbag by the airbag device concerning an embodiment. 第１変形例に係るエアバッグの平面視の概略構成を示す模式図である。It is a schematic diagram which shows the schematic structure of the planar view of the airbag which concerns on a 1st modification. 第２変形例に係るエアバッグの平面視の概略構成を示す模式図である。It is a schematic diagram which shows the schematic structure of the planar view of the airbag which concerns on a 2nd modification.
　以下、添付図面を参照しながら実施形態について説明する。説明の理解を容易にするため、各図面において同一の構成要素に対しては可能な限り同一の符号を付して、重複する説明は省略する。 Hereinafter, embodiments will be described with reference to the accompanying drawings. To facilitate understanding of the description, the same components are denoted by the same reference numerals as much as possible in each drawing, and redundant description will be omitted.
　なお、以下の説明において、各図面で示すｘ方向、ｙ方向、ｚ方向は互いに垂直な方向である。ｘ方向は車両の前後方向であり、ｘ正方向側が車両前方、ｘ負方向側が車両後方である。ｙ方向は車両の幅方向であり、ｙ正方向側が車両右側、ｙ負方向側が車両左側である。ｚ方向は上下方向であり、ｚ正方向側が上方、ｚ負方向側が下方である。 In the following description, the x, y, and z directions shown in each drawing are directions perpendicular to each other. The x direction is the front-back direction of the vehicle, the x positive direction side is the vehicle front, and the x negative direction side is the vehicle rear. The y direction is the width direction of the vehicle, the y positive direction side is the vehicle right side, and the y negative direction side is the vehicle left side. The z direction is the vertical direction, with the z positive direction side being upward and the z negative direction side being downward.
　図１～図４を参照して、実施形態に係るエアバッグ装置１０の構成を説明する。図１は、実施形態に係るエアバッグ装置１０のエアバッグ展開時の斜視図である。図２は、図１に示すエアバッグ装置１０の側面図である。図３は、図１に示すエアバッグ装置１０の正面図である。図４は、図１～３中のエアバッグ２０の平面視の概略構成を示す模式図である。 構成 The configuration of the airbag device 10 according to the embodiment will be described with reference to FIGS. FIG. 1 is a perspective view of the airbag device 10 according to the embodiment when the airbag is deployed. FIG. 2 is a side view of the airbag device 10 shown in FIG. FIG. 3 is a front view of the airbag device 10 shown in FIG. FIG. 4 is a schematic diagram showing a schematic configuration of the airbag 20 in FIGS. 1 to 3 in plan view.
　図１～図３に示すように、エアバッグ装置１０は車両の座席６０に搭載される。座席６０は、乗員Ｄが着座する座部６１と、座部６１の後端に下端が連結されたシートバック６２と、シートバック６２の上端に設けられたヘッドレスト６３とを含んで構成される。シートバック６２の内部にはフレーム６４が配置されている。なお、図１～図３には図示を省略しているが、座席６０にはシートベルト、タング、バックル、リトラクタなど、車両用シートに搭載される一般的な要素も設置されている。 エ ア As shown in FIGS. 1 to 3, the airbag device 10 is mounted on a seat 60 of a vehicle. The seat 60 includes a seat portion 61 on which the occupant D sits, a seat back 62 having a lower end connected to a rear end of the seat portion 61, and a headrest 63 provided at an upper end of the seat back 62. A frame 64 is arranged inside the seat back 62. Although not shown in FIGS. 1 to 3, the seat 60 is also provided with general components mounted on the vehicle seat, such as a seat belt, a tongue, a buckle, and a retractor.
　また、図３に示すように、本実施形態ではエアバッグ装置１０が搭載される座席６０として車両右側の前部座席を例示する。この場合、ｙ正方向側が車両外側、ｙ負方向側が車両内側となる。 As shown in FIG. 3, in the present embodiment, a front seat on the right side of the vehicle is illustrated as the seat 60 on which the airbag device 10 is mounted. In this case, the y positive direction side is the vehicle outside, and the y negative direction side is the vehicle inside.
　エアバッグ装置１０は、座席６０に乗員Ｄが着座した状態で、展開したエアバッグ２０によって乗員Ｄを前後左右の全方向の衝突から保護する。エアバッグ２０は、座席６０のヘッドレスト６３と、座席６０に着座している乗員Ｄの頭部Ｈの周囲を覆い、上方と下方が開口する筒状に形成されている。 The airbag device 10 protects the occupant D from collision in all directions, front, rear, right and left, by the deployed airbag 20 in a state where the occupant D is seated on the seat 60. The airbag 20 is formed in a tubular shape that covers the headrest 63 of the seat 60 and the periphery of the head H of the occupant D seated on the seat 60 and is open at the top and bottom.
　図１～図４では、保護すべき乗員Ｄのモデルとして衝突試験用のダミー人形が座席６０の座部６１に着座した状態を示している。ダミー人形は、例えばＷｏｒｌｄＳＩＤ（国際統一側面衝突ダミー：Ｗｏｒｌｄ　Ｓｉｄｅ　Ｉｍｐａｃｔ　Ｄｕｍｍｙ）のＡＭ５０（米国人成人男性の５０パーセンタイル）である。このダミー人形は、衝突試験法で定められた標準的な着座姿勢（正規の状態）で着座しており、座席６０は、当該着座姿勢に対応した基準設定位置に位置している。ダミー人形の頭部Ｈは、顔面を車両前方（座席６０の前方側）へ向けている。 FIGS. 1 to 4 show a state in which a dummy doll for a collision test is seated on the seat portion 61 of the seat 60 as a model of the occupant D to be protected. The dummy doll is, for example, WorldSID (International Unified Side Impact Dummy: World @ Side @ Impact @ Dummy) AM50 (50th percentile of American adult males). The dummy doll is seated in a standard sitting posture (regular state) determined by the collision test method, and the seat 60 is located at a reference setting position corresponding to the sitting posture. The head of the dummy doll H faces the front of the vehicle (the front side of the seat 60).
　エアバッグ装置１０は、エアバッグ２０と、インフレータ３０と、収容部４０とを備える。インフレータ３０及び収容部４０については図９、図１０を参照して後述する。 The airbag device 10 includes an airbag 20, an inflator 30, and a housing 40. The inflator 30 and the housing section 40 will be described later with reference to FIGS.
　エアバッグ２０は、乗員Ｄの頭部Ｈを前方及び左右両側方から覆うように膨張展開される筒状の一体の袋体として構成されている。より詳細には、エアバッグ２０は、後方膨張部２１、一対の側方膨張部２２Ａ，２２Ｂ、一対の前方膨張部２３Ａ，２３Ｂを有する。 The airbag 20 is configured as a tubular integral bag that is inflated and deployed so as to cover the head H of the occupant D from the front and both left and right sides. More specifically, the airbag 20 has a rear inflation portion 21, a pair of side inflation portions 22A and 22B, and a pair of front inflation portions 23A and 23B.
　後方膨張部２１は、図１，２、４に示すように、ヘッドレスト６３より後方の位置で、ヘッドレスト６３やシートバック６２と対向するよう展開する。後方膨張部２１は、図４に示すように、ｙ方向両側の端部にて、後方屈曲部７４Ａ、７４Ｂを介して一対の側方膨張部２２Ａ，２２Ｂの後方側端部に接続されている。後方屈曲部７４Ａ、７４Ｂはｘ正方向側に略直角に屈曲して、図１，２，４に示すように、一対の側方膨張部２２Ａ，２２Ｂを後方膨張部２１から前方へ延在させる。 The rear inflatable portion 21 is deployed at a position behind the headrest 63 so as to face the headrest 63 and the seat back 62 as shown in FIGS. As shown in FIG. 4, the rear inflatable portion 21 is connected to the rear end of the pair of lateral inflatable portions 22A and 22B via rear bent portions 74A and 74B at both ends in the y direction. . The rear bent portions 74A and 74B are bent at substantially right angles to the x positive direction side to extend the pair of side expanding portions 22A and 22B forward from the rear expanding portion 21 as shown in FIGS. .
　一対の側方膨張部２２Ａ，２２Ｂは、乗員Ｄの頭部Ｈの左右にそれぞれ配置される。一対の側方膨張部２２Ａ，２２Ｂは、後方側に対して前方側のほうが上下方向の寸法が長く、かつ、下方側により長く形成される。前方側の長さは、前方膨張部２３Ａ、２３Ｂの上下方向寸法と略同一である。 The pair of lateral expansion portions 22A and 22B are respectively disposed on the left and right sides of the head H of the occupant D. The pair of lateral expansion portions 22A and 22B are formed such that the front side has a longer dimension in the vertical direction than the rear side and is longer than the lower side. The length of the front side is substantially the same as the vertical dimension of the front expansion portions 23A and 23B.
　また、一対の側方膨張部２２Ａ，２２Ｂの上部には、他の部分より上方に突出する頭頂部２９Ａ、２９Ｂがそれぞれ設けられる。頭頂部２９Ａ，２９Ｂは、車室の天井と接触可能な高さで形成される。例えば図３に示すように、車室内の天井位置は車両外側に比べて車両中央側が高い場合が多いが、このような場合、天井の形状に合わせて車両外側の頭頂部２９Ａの高さを車両中央側の頭頂部２９Ｂより低く形成する。これにより、頭頂部２９Ａ，２９Ｂと天井との接触量を調整して略同等にでき、エアバッグ２０の展開挙動の安定化を図ることができる。 頭 Moreover, the top parts 29A and 29B which protrude above other parts are provided in the upper part of a pair of side expansion parts 22A and 22B, respectively. The crowns 29A, 29B are formed at a height that can contact the ceiling of the vehicle compartment. For example, as shown in FIG. 3, the ceiling position in the vehicle interior is often higher on the vehicle center side than on the vehicle outer side. In such a case, the height of the crown portion 29A on the vehicle outer side is adjusted according to the ceiling shape. It is formed lower than the central crown 29B. Thereby, the amount of contact between the crowns 29A and 29B and the ceiling can be adjusted to be substantially equal, and the deployment behavior of the airbag 20 can be stabilized.
　一対の側方膨張部２２Ａ，２２Ｂは、前方側端部にて前方屈曲部７５Ａ、７５Ｂを介して一対の前方膨張部２３Ａ、２３Ｂに接続されている。前方屈曲部７５Ａ、７５Ｂはｙ方向かつ中心側に略直角に屈曲して、図１、３、４に示すように、一対の前方膨張部２３Ａ，２３Ｂを乗員Ｄの頭部Ｈの前方を覆うように中央側へ延在させる。一対の前方膨張部２３Ａ，２３Ｂは、ｙ方向の略中央位置にて中央接合部７６によってｚ方向に沿って相互に接合され、これにより乗員Ｄの頭部Ｈの前方に並んで配置され、頭部Ｈの前方を完全に塞ぐことができる。また、一対の前方膨張部２３Ａ、２３Ｂは、ｘ方向から視たときに略矩形状に形成され、乗員Ｄの頭部Ｈの正面全体をカバーできる程度の幅方向及び上下方向の寸法がとられている。 The pair of side inflatable portions 22A, 22B are connected to the pair of front inflatable portions 23A, 23B via front bent portions 75A, 75B at front end portions. The front bent portions 75A and 75B are bent at a substantially right angle toward the center in the y direction, and cover a pair of front expanding portions 23A and 23B in front of the head H of the occupant D as shown in FIGS. To the center side. The pair of front inflatable portions 23A and 23B are joined to each other along the z-direction at a substantially central position in the y-direction by a central joining portion 76, whereby the front inflatable portions 23A and 23B are arranged in front of the head H of the occupant D, The front of the portion H can be completely closed. Further, the pair of front inflatable portions 23A and 23B are formed in a substantially rectangular shape when viewed from the x direction, and have dimensions in the width direction and the vertical direction that can cover the entire front surface of the head H of the occupant D. ing.
　このようにエアバッグ２０は、中央接合部７６によって、一体的な袋体の両端が接合縫いで接合されることで、乗員Ｄの頭部Ｈの前後方向、左右方向の全方位を囲んだドーナツ状に形成されている。 As described above, the airbag 20 is formed by joining the both ends of the integral bag body by the joining seam by the central joint portion 76, so that the donut which surrounds the head H of the occupant D in all directions in the front-rear direction and the left-right direction. It is formed in a shape.
　また、前方膨張部２３Ａ，２３Ｂは、中央接合部７６を幅方向中央に配置することにより、乗員Ｄ側から視たときに前方膨張部２３Ａ，２３Ｂのｙ方向の略中央部に前方に窪んだ前方凹部２７が形成されている。前方凹部２７は、中央接合部７６の範囲に亘りｚ方向に延在する。前方膨張部２３Ａ，２３Ｂの内表面に前方凹部２７があることによって、頭部Ｈに対する前方膨張部２３Ａ，２３Ｂの内表面の接触面が広くなり、また、対向角度も多様となるので、車両前方側でエアバッグ２０が衝撃吸収可能な方位を増やすことができ、乗員Ｄをより幅広い方向の衝突から保護できる。 In addition, the front inflatable portions 23A and 23B are recessed forward in the y-direction substantially central portions of the front inflatable portions 23A and 23B when viewed from the occupant D side by arranging the center joint portion 76 at the center in the width direction. A front recess 27 is formed. The front recess 27 extends in the z-direction over the area of the central joint 76. The presence of the front recess 27 on the inner surfaces of the front inflatable portions 23A and 23B increases the contact surface of the inner surfaces of the front inflatable portions 23A and 23B with the head H, and also makes the opposing angles diversified. The direction in which the airbag 20 can absorb the impact on the side can be increased, and the occupant D can be protected from a collision in a wider direction.
　前方膨張部２３Ａ、２３Ｂの上端位置は、乗員Ｄの頭部Ｈの頭頂部より上方となればよい。また、その下端位置は、本実施形態では乗員Ｄの胸部を覆う位置となるように設けられているが、少なくとも乗員Ｄの頭部Ｈをカバーできる程度の位置でもよく、図１～図３に示す本実施形態の寸法より短くてもよい。 上端 The upper ends of the front inflatable portions 23A and 23B may be located above the top of the head H of the occupant D. In addition, the lower end position is provided so as to cover the chest of the occupant D in the present embodiment, but may be a position that can cover at least the head H of the occupant D. It may be shorter than the dimensions of the illustrated embodiment.
　図１～図４に示すように、一対の前方膨張部２３Ａ，２３Ｂは、拘束部２４Ａ，２４Ｂ及びエネルギ吸収（Ｅｎｅｒｇｙ　Ａｂｓｏｒｐｔｉｏｎ：ＥＡ）部２５Ａ，２５Ｂを有する。拘束部２４Ａ，２４Ｂは、それぞれ一対の側方膨張部２２Ａ，２２Ｂから中央側に屈曲して延在する。ＥＡ部２５Ａ，２５Ｂは、拘束部２４Ａ，２４Ｂの中央側端部に接続され、中央部からｙ方向両側の前方屈曲部７５Ａ、７５Ｂ側へと延在して、これにより拘束部２４Ａ，２４Ｂの前方側に重ねて配置される。また、ＥＡ部２５Ａ、２５Ｂの外側端部は、一対の側方膨張部２２Ａ，２２Ｂの前方側端部に設けられる先端接合部７７Ａ、７７Ｂによって、一対の側方膨張部２２Ａ，２２Ｂと接合される。これにより、一対のＥＡ部２５Ａ，２５Ｂが拘束部２４Ａ、２４Ｂの前方にてｙ方向に並んで配置され、かつ、拘束部２４Ａ，２４Ｂと平行に配置されて、拘束部２４Ａ，２４ＢとＥＡ部２５Ａ、２５Ｂとが乗員Ｄの頭部Ｈの前方に二重に配置される。 よ う As shown in FIGS. 1 to 4, the pair of front inflatable portions 23A and 23B have restraining portions 24A and 24B and energy absorbing (Energy Absorption: EA) portions 25A and 25B. The constraining portions 24A and 24B bend and extend to the center side from the pair of lateral expansion portions 22A and 22B, respectively. The EA portions 25A, 25B are connected to the center-side ends of the restraining portions 24A, 24B, and extend from the center portion to the front bent portions 75A, 75B on both sides in the y direction, thereby forming the restraining portions 24A, 24B. It is arranged to overlap on the front side. Further, the outer ends of the EA portions 25A, 25B are joined to the pair of lateral inflatable portions 22A, 22B by tip joint portions 77A, 77B provided at the front end of the pair of lateral inflatable portions 22A, 22B. You. As a result, the pair of EA portions 25A, 25B are arranged in the y direction in front of the restraining portions 24A, 24B, and are arranged in parallel with the restraining portions 24A, 24B, and the restraining portions 24A, 24B and the EA portion are arranged. 25A and 25B are arranged in front of the head H of the occupant D in a double manner.
　前方膨張部２３Ａ，２３Ｂの拘束部２４Ａ，２４Ｂは、乗員Ｄの頭部Ｈの正面に配置されて、衝突時に頭部Ｈの正面側を保護するよう機能する。ＥＡ部２５Ａ、２５Ｂは、座席前方のハンドル等にエアバッグ２０が衝突するなどの二次衝突が発生した場合に、エアバッグ２０の拘束部２４Ａ、２４Ｂ側にかかる荷重を制限して乗員にかかるエネルギを吸収緩和するよう機能する。 The restraint portions 24A and 24B of the front inflatable portions 23A and 23B are arranged in front of the head H of the occupant D and function to protect the front side of the head H in the event of a collision. The EA portions 25A and 25B limit the load applied to the restraint portions 24A and 24B of the airbag 20 when a secondary collision such as the collision of the airbag 20 with a handle or the like in front of the seat is applied to the occupant. It functions to absorb and mitigate energy.
　エアバッグ２０は、後方膨張部２１のインフレータ挿入口２６にインフレータ３０が取り付けられて、インフレータ３０からのガスが供給される。エアバッグ２０は、後方膨張部２１から一方の側方膨張部２２Ａ、一方の拘束部２４Ａ、一方のＥＡ部２５Ａの順でガス流路が形成され、また、後方膨張部２１から他方の側方膨張部２２Ｂ、他方の拘束部２４Ｂ、他方のＥＡ部２５Ｂの順でガス流路が形成される。 In the airbag 20, the inflator 30 is attached to the inflator insertion port 26 of the rear inflating portion 21, and gas from the inflator 30 is supplied. In the airbag 20, a gas flow path is formed in the order from the rear inflating portion 21 to one side inflating portion 22A, one restricting portion 24A, and one EA portion 25A. A gas flow path is formed in the order of the inflating portion 22B, the other restraining portion 24B, and the other EA portion 25B.
　図５は、エアバッグ２０を構成するアウターパネル５１の平面図である。図６は、エアバッグ２０を構成するインナーパネル５２の平面図である。図７は、エアバッグ２０を構成する補強パッチ５３の平面図である。図８は、エアバッグ２０を構成する基布パイプ５４の平面図である。図５～図９は、エアバッグ２０を構成する各部を分解した図である。図５～図９に示すように、エアバッグ２０は、アウターパネル５１、インナーパネル５２、補強パッチ５３、基布パイプ５４と、を備えて構成される。 FIG. 5 is a plan view of the outer panel 51 constituting the airbag 20. FIG. FIG. 6 is a plan view of the inner panel 52 constituting the airbag 20. FIG. FIG. 7 is a plan view of the reinforcing patch 53 constituting the airbag 20. FIG. FIG. 8 is a plan view of the base fabric pipe 54 constituting the airbag 20. FIG. 5 to FIG. 9 are exploded views of each part constituting the airbag 20. FIG. As shown in FIGS. 5 to 9, the airbag 20 includes an outer panel 51, an inner panel 52, a reinforcing patch 53, and a base cloth pipe.
　アウターパネル５１とインナーパネル５２とは、重ね合せられて周縁部の外周縫製ライン５６に沿って縫製されることによって、一体的な袋体を形成する。アウターパネル５１とインナーパネル５２は、中央に後方膨張部２１の部分、その両側に一対の側方膨張部２２Ａ、２２Ｂの部分、さらに両側に一対の前方膨張部２３Ａ、２３Ｂの拘束部２４Ａ、２４Ｂ、そのさらに外側にＥＡ部２５Ａ、２５Ｂの部分が配置される。図４に示すように、アウターパネル５１はエアバッグ２０展開時に外側に向く外表面を形成し、インナーパネル５２はエアバッグ２０展開時に中心の頭部Ｈ側を向く内表面を形成する。 (4) The outer panel 51 and the inner panel 52 are overlapped and sewn along the outer peripheral sewing line 56 at the peripheral edge to form an integral bag. The outer panel 51 and the inner panel 52 have a rear inflatable portion 21 in the center, a pair of lateral inflatable portions 22A, 22B on both sides, and a pair of front inflatable portions 23A, 23B on both sides. EA portions 25A and 25B are arranged further outside. As shown in FIG. 4, the outer panel 51 forms an outer surface facing outward when the airbag 20 is deployed, and the inner panel 52 forms an inner surface facing the center head H side when the airbag 20 is deployed.
　後方膨張部２１と側方膨張部２２Ａ、２２Ｂとの間には円状に縫製された複数の円縫い部５５Ａ，５５Ｂが設けられ、アウターパネル５１とインナーパネル５２とを接合している。これらの円縫い部５５Ａ、５５Ｂによって袋体の屈曲が促進されるので、後方屈曲部７４Ａ、７４Ｂが形成される。また、円縫い部５５Ａ、５５Ｂによってアウターパネル５１とインナーパネル５２とを部分的に接合することによって、エアバッグ２０の容量を削減できる。 円 A plurality of circular sewing portions 55A and 55B sewn in a circular shape are provided between the rear expanding portion 21 and the lateral expanding portions 22A and 22B, and join the outer panel 51 and the inner panel 52. Since the bending of the bag body is promoted by these circular stitch portions 55A and 55B, the rear bent portions 74A and 74B are formed. Further, by partially joining the outer panel 51 and the inner panel 52 with the circular stitch portions 55A and 55B, the capacity of the airbag 20 can be reduced.
　また、アウターパネル５１の側方膨張部２２Ａ、２２Ｂと拘束部２４Ａ、２４Ｂとの間に左側縫製ライン５８と右側縫製ライン５９とが設けられ、これにより前方屈曲部７５Ａ、７５Ｂが形成されている。 Further, a left sewing line 58 and a right sewing line 59 are provided between the lateral expansion portions 22A, 22B of the outer panel 51 and the restraining portions 24A, 24B, thereby forming front bending portions 75A, 75B. .
　また、拘束部２４ＡとＥＡ部２５Ａとの間には、高さ方向の中央部に環状に縫製された前方縫製ライン５７Ａが設けられ、アウターパネル５１とインナーパネル５２とを接合している。同様に、拘束部２４ＢとＥＡ部２５Ｂとの間には、高さ方向の中央部に環状に縫製された前方縫製ライン５７Ｂが設けられ、アウターパネル５１とインナーパネル５２とを接合している。前方縫製ライン５７Ａ、５７Ｂに囲まれる領域は、エアバッグ２０の作動時も膨張しない非膨張部となる。この非膨張部の高さ方向の両脇は、拘束部２４Ａ、２４ＢからＥＡ部２５Ａ、２５Ｂにガスを通す流路となる。 A front sewing line 57A sewn annularly at the center in the height direction is provided between the restraining portion 24A and the EA portion 25A, and joins the outer panel 51 and the inner panel 52. Similarly, a front sewing line 57B sewn annularly at the center in the height direction is provided between the restraining portion 24B and the EA portion 25B, and joins the outer panel 51 and the inner panel 52. The area surrounded by the front sewing lines 57A and 57B is a non-inflating portion that does not inflate even when the airbag 20 is operated. Both sides in the height direction of the non-inflated portion serve as flow paths for passing gas from the restraining portions 24A, 24B to the EA portions 25A, 25B.
　前方縫製ライン５７Ａ、５７Ｂに囲まれる領域には、高さ方向に沿って略等間隔で複数（本実施形態では３個）の円縫い部５５Ｅが設けられる。円縫い部５５Ｅは、前方膨張部２３Ａ側のアウターパネル５１と、インナーパネル５２と、前方膨張部２３Ｂ側のアウターパネル５１と、インナーパネル５２との間を縫製して、これらをまとめて接合している。これにより、一対の前方膨張部２３Ａ、２３Ｂの間に中央接合部７６が形成される。 複数 A plurality of (three in this embodiment) circular sewing portions 55E are provided at substantially equal intervals along the height direction in a region surrounded by the front sewing lines 57A and 57B. The circular sewing portion 55E sewes the outer panel 51, the inner panel 52 on the side of the front expanding section 23A, the outer panel 51 on the side of the front expanding section 23B, and the inner panel 52, and joins them together. ing. As a result, a central joint portion 76 is formed between the pair of front inflatable portions 23A and 23B.
　ＥＡ部２５Ａ、２５Ｂの外側端部にも縫製ライン５８、５９がそれぞれ設けられ、先端接合部７７Ａ、７７Ｂに接合されている。 縫 Sewing lines 58 and 59 are also provided at outer end portions of the EA portions 25A and 25B, respectively, and are joined to the distal end joining portions 77A and 77B.
　側方膨張部２２Ａ、２２Ｂの高さ方向の略中央部には、前後方向に沿って一対の円縫いパッチ５５Ｃ、５５Ｄが設けられる。円縫いパッチ５５Ｃ、５５Ｄは、アウターパネル５１及びインナーパネル５２の外側に円形状のパッチが配置され、これらのパッチとアウターパネル５１及びインナーパネル５２との間を縫製して、アウターパネル５１とインナーパネル５２とを接合している。円縫いパッチ５５Ｃ、５５Ｄは、外側にパッチを配置することにより縫製部を補強できる。 一 対 A pair of circular sewing patches 55C, 55D are provided along the front-rear direction at substantially the center in the height direction of the lateral expansion portions 22A, 22B. In the circular sewing patches 55C and 55D, circular patches are arranged outside the outer panel 51 and the inner panel 52, and the patches are sewn between the outer panel 51 and the inner panel 52, and the outer panel 51 and the inner panel 52 are sewn. The panel 52 is joined. The circular sewing patches 55C and 55D can reinforce the sewn portion by arranging the patches on the outside.
　側方膨張部２２Ａ、２２Ｂでは、前後方向に沿って設けられる一対の円縫いパッチ５５Ｃ、５５Ｄの間を前後方向に沿って直線状に縫製しており、これにより、側方膨張部２２Ａ、２２Ｂのガス流路を高さ方向に２つに区分して、エアバッグ２０の膨張時の厚みが規制される。さらに側方膨張部２２Ａでは、上述の一対の円縫いパッチ５５Ｃのうち前後方向後側のものの上側及び下側にも円縫いパッチ５５Ｃが設けられている。つまり、高さ方向に３個の円縫いパッチ５５Ｃが設けられる領域が形成される。この領域では、他の領域に比べてエアバッグ２０膨張時の厚みがさらに抑制される。 In the side expansion portions 22A and 22B, a pair of circular sewing patches 55C and 55D provided along the front and rear direction is sewn linearly along the front and rear direction, thereby forming the side expansion portions 22A and 22B. Is divided into two in the height direction, and the thickness of the airbag 20 when inflated is regulated. Further, in the side inflation portion 22A, the circular stitching patches 55C are also provided on the upper side and the lower side of the pair of circular stitching patches 55C on the rear side in the front-rear direction. That is, an area where three circular sewing patches 55C are provided in the height direction is formed. In this region, the thickness when the airbag 20 is inflated is further suppressed as compared with the other regions.
　図３を参照して説明したように、本実施形態では側方膨張部２２Ａが車両外側に配置され、その一部がＢピラーと対向する。エアバッグ２０の機能確保のためには膨張時にＢピラーとの干渉を回避できるのが好ましい。そこで本実施系阿智では、側方膨張部２２ＡのうちＢピラーと対向する位置に、高さ方向に沿って複数（本実施形態では３個）の円縫いパッチ５５Ｃを配置することで、側方膨張部２２ＡのＢピラーとの対向部分の厚みを局所的に抑えて、エアバッグ２０とＢピラーとの干渉を回避できるよう構成されている。 説明 As described with reference to FIG. 3, in the present embodiment, the side inflating portion 22A is disposed outside the vehicle, and a part thereof faces the B pillar. In order to ensure the function of the airbag 20, it is preferable that interference with the B pillar can be avoided during inflation. Therefore, in the present embodiment Achi, a plurality of (three in this embodiment) circular sewing patches 55C are arranged along the height direction at a position facing the B pillar in the side inflated portion 22A, so that the The thickness of a portion of the inflatable portion 22A facing the B pillar is locally suppressed so that interference between the airbag 20 and the B pillar can be avoided.
　ＥＡ部２５Ａ、２５Ｂの幅方向の略中央部には、高さ方向に沿って複数（本実施形態では２個）の円縫いパッチ５５Ｆ、５５Ｇが設けられ、アウターパネル５１とインナーパネル５２とを接合している。これにより、エアバッグ膨張時のＥＡ部２５Ａ、２５Ｂの前後方向の厚みを規制している。 A plurality (two in the present embodiment) of circular sewing patches 55F and 55G are provided along the height direction at a substantially central portion in the width direction of the EA portions 25A and 25B, and the outer panel 51 and the inner panel 52 are provided. Are joined. This regulates the thickness of the EA portions 25A and 25B in the front-rear direction when the airbag is inflated.
　なお、円縫い部５５Ａ、５５Ｂ、５５Ｅにも円縫いパッチを設ける構成としてもよい。 The circular sewing portions 55A, 55B, and 55E may be provided with circular sewing patches.
　補強パッチ５３は、図７に示すものが同形状で２枚あり、それぞれがアウターパネル５１とインナーパネル５２のうち後方膨張部２１の部分の外側に配置され、パッチ縫製ライン７３によってアウターパネル５１とインナーパネル５２にそれぞれ接合される。 The reinforcing patch 53 has the same shape as that shown in FIG. 7, and is disposed outside the rear inflating portion 21 of the outer panel 51 and the inner panel 52, and is connected to the outer panel 51 by a patch sewing line 73. Each is joined to the inner panel 52.
　基布パイプ５４は、インフレータ３０の先端部に取り付けられた状態でインフレータ挿入口２６に挿入される。インフレータ挿入口２６は、図４～図６に示すようにエアバッグ２０のうち後方膨張部２１に設けられる。 The base fabric pipe 54 is inserted into the inflator insertion opening 26 in a state where the base fabric pipe 54 is attached to the distal end of the inflator 30. The inflator insertion opening 26 is provided in the rear inflatable portion 21 of the airbag 20 as shown in FIGS.
　エアバッグ２０の縫製順序は、例えば、（１）外周縫製ライン５６、（２）前方縫製ライン５７（中央接合部７６）、（３）左側縫製ライン５８（先端接合部７７Ｂ）、（４）右側縫製ライン５９（先端接合部７７Ａ）の順番とすることができる。 The sewing order of the airbag 20 is, for example, (1) outer peripheral sewing line 56, (2) front sewing line 57 (central joint portion 76), (3) left sewing line 58 (tip joint portion 77B), and (4) right side. The order of the sewing line 59 (the distal end joint portion 77A) can be set.
　図９、図１０を参照して、エアバッグ２０の収納状態を説明する。図９は、実施形態に係るエアバッグ装置１０のエアバッグ収納時の側面図である。図１０は、図９中の収容部４０近傍の拡大図である。図９、図１０に示すように、エアバッグ２０は、折り畳まれた状態で収容部４０に収容される。収容部４０は、例えばシートバック６２内部のフレーム６４に取り付けられてシートバック６２内に格納される。 収納 The storage state of the airbag 20 will be described with reference to FIGS. FIG. 9 is a side view of the airbag device 10 according to the embodiment when the airbag is housed. FIG. 10 is an enlarged view of the vicinity of the storage section 40 in FIG. As shown in FIGS. 9 and 10, the airbag 20 is stored in the storage section 40 in a folded state. The accommodation section 40 is attached to a frame 64 inside the seat back 62 and stored in the seat back 62, for example.
　収容部４０は、シートバック６２の延在方向に沿って上方に開口して配置される。収容部４０の下方にインフレータ３０が配置され、収容部の下方からエアバッグ２０のインフレータ挿入口２６に挿入される。インフレータ挿入口２６は、例えば収容部４０の底壁を貫通して下方に進出されて、インフレータ３０が挿入される。 (4) The accommodation section 40 is disposed so as to open upward along the direction in which the seat back 62 extends. The inflator 30 is disposed below the storage section 40, and is inserted into the inflator insertion opening 26 of the airbag 20 from below the storage section. The inflator insertion opening 26 penetrates, for example, the bottom wall of the housing section 40 and advances downward, and the inflator 30 is inserted.
　インフレータ３０は、例えば燃焼式またはコールドガス式であり、車両のＥＣＵなどの制御装置によって動作を制御される。インフレータ３０は、作動することによって発生したガスを、インフレータ挿入口２６を介してエアバッグ２０内に供給する。本実施形態では、インフレータ３０は、例えばシリンダ型のインフレータであり、シートの高さ方向を長手方向として配置されている。 The inflator 30 is, for example, of a combustion type or a cold gas type, and its operation is controlled by a control device such as a vehicle ECU. The inflator 30 supplies gas generated by the operation into the airbag 20 through the inflator insertion port 26. In the present embodiment, the inflator 30 is, for example, a cylinder-type inflator, and is arranged with the height direction of the seat as a longitudinal direction.
　インフレータ３０は、例えば図１０に示すように、フレーム６４に固設されたブラケット３１にバンド３２を用いて固定される。本実施形態では、図４に示すとおり後方膨張部２１に２つのインフレータ挿入口２６が設けられ、２本のインフレータ３０が設置されるが、インフレータ３０の数は１本でもよいし、２本より多い数でもよい。 The inflator 30 is fixed to a bracket 31 fixed to a frame 64 by using a band 32, for example, as shown in FIG. In the present embodiment, two inflator insertion ports 26 are provided in the rear inflatable portion 21 and two inflators 30 are installed as shown in FIG. 4, but the number of inflators 30 may be one or two. A larger number may be used.
　収容部４０は、例えば樹脂製で箱状に形成されており、上方側が開口されている。この収容部４０の箱状の内部空間に、折り畳まれた状態のエアバッグ２０が収容される。収容部４０は、エアバッグ装置１０の非作動時にはシートバック６２の上部に格納されている。エアバッグ装置１０の作動時には、エアバッグ２０の膨張圧によってシートバック６２の表面が破断され、エアバッグ２０が外部に膨張展開できるようになっている。 (4) The accommodation section 40 is made of, for example, resin and is formed in a box shape, and has an upper side opened. The folded airbag 20 is accommodated in the box-shaped internal space of the accommodation section 40. The storage section 40 is stored above the seat back 62 when the airbag device 10 is not operated. When the airbag device 10 is operated, the surface of the seat back 62 is broken by the inflation pressure of the airbag 20, so that the airbag 20 can be inflated and deployed to the outside.
　図１０に示すように、収容部４０に収容される状態のエアバッグ２０は、ロール状に折り畳まれたロール折り部７１と、蛇腹状に折り畳まれた蛇腹折り部７２とを含んで構成される。ロール折り部７１は、エアバッグ２０の展開状態における前方膨張部２３Ａ、２３Ｂ側から側方膨張部２２Ａ、２２Ｂの上方面側へ上向き回りに巻くようにロール状に折り畳まれた状態で収容部４０に収容されており、膨張展開時にシート前方側へ展開しやすい折り畳み方とされている。蛇腹折り部７２は、エアバッグ２０の展開状態における後方膨張部２１を蛇腹状に折り畳まれた状態で、収容部４０のロール折り部７１より上方の位置に収容されており、膨張展開時にロール折り部７１より先に展開しやすくされている。 As shown in FIG. 10, the airbag 20 housed in the housing unit 40 is configured to include a roll folded part 71 folded in a roll shape and a bellows folded part 72 folded in a bellows shape. . The roll folded portion 71 is folded into a roll so as to wind upward from the front inflatable portions 23A, 23B side to the upper surface side of the lateral inflatable portions 22A, 22B in the deployed state of the airbag 20. The seat is folded so that it can be easily deployed toward the front of the seat when inflated and deployed. The bellows folded portion 72 is accommodated in a position above the roll folded portion 71 of the accommodation portion 40 in a state where the rear inflating portion 21 in the deployed state of the airbag 20 is folded in a bellows shape. It is easy to deploy before the part 71.
　エアバッグ２０のインフレータ挿入口２６は、ロール折り部７１及び蛇腹折り部７２に含まれず、ロール折り部７１より下方に配置されて、インフレータ３０が挿入されている。なお、図１０では、ロール折り部７１及び蛇腹折り部７２の収納状態を模式的に表す便宜上、インフレータ挿入口２６からロール折り部７１及び蛇腹折り部７２の両方に分岐しているように図示されているが、上述のとおりインフレータ挿入口２６は後方膨張部２１に設けられるので、実際には蛇腹折り部７２のみに接続する。このため、ロール折り部７１と、蛇腹折り部７２とは、先にガスが上方の蛇腹折り部７２に供給可能となっている。 The inflator insertion opening 26 of the airbag 20 is not included in the roll folded portion 71 and the bellows folded portion 72, but is disposed below the roll folded portion 71, and the inflator 30 is inserted. In FIG. 10, for convenience of schematically showing the storage state of the roll folded portion 71 and the bellows folded portion 72, it is illustrated as branched from the inflator insertion opening 26 to both the roll folded portion 71 and the bellows folded portion 72. However, since the inflator insertion port 26 is provided in the rear inflatable portion 21 as described above, it is actually connected only to the bellows folded portion 72. For this reason, the roll folding part 71 and the bellows folding part 72 can supply gas to the bellows folding part 72 above first.
　また、ロール折り部７１は、側方膨張部２２Ａ、２２Ｂ、前方膨張部２３Ａ、２３Ｂの順でガスを供給することで、側方膨張部２２Ａ、２２Ｂが乗員Ｄの頭部Ｈより上方の位置で膨張展開し、前方膨張部２３Ａ、２３Ｂが乗員Ｄの頭部Ｈより前方の位置で膨張展開するよう構成される。 The roll folding section 71 supplies the gas in the order of the side inflating sections 22A and 22B and the front inflating sections 23A and 23B so that the side inflating sections 22A and 22B are positioned above the head H of the occupant D. And the front inflatable portions 23A and 23B are inflated and deployed at a position forward of the head H of the occupant D.
　次に、図１１～図１５を参照して、エアバッグ装置１０によるエアバッグ２０の展開手順を説明する。図１１～図１５は、実施形態に係るエアバッグ装置１０によるエアバッグ２０の展開手順の第１～第５段階をそれぞれ示す図である。 Next, a procedure for deploying the airbag 20 by the airbag device 10 will be described with reference to FIGS. FIG. 11 to FIG. 15 are diagrams respectively showing first to fifth stages of the deployment procedure of the airbag 20 by the airbag device 10 according to the embodiment.
　まず図９、図１０に示したように平常時（エアバッグ装置１０非作動時）には、エアバッグ２０は折り畳まれてシードバック内の収容部４０に格納されている。そして、車両の衝突等により所定の閾値以上の衝撃を受けると、ＥＣＵによりインフレータ３０が作動され、インフレータ３０からエアバッグ２０にガスが供給され始める。 First, as shown in FIGS. 9 and 10, in normal times (when the airbag device 10 is not operated), the airbag 20 is folded and stored in the storage portion 40 in the seed bag. Then, when a shock equal to or more than a predetermined threshold is received due to a vehicle collision or the like, the inflator 30 is operated by the ECU, and gas is started to be supplied from the inflator 30 to the airbag 20.
　図１１に示す第１段階では、インフレータ３０からガスが供給され始めると、まず上方の蛇腹折り部７２にガスが供給されて膨張しはじめる。蛇腹折り部７２は、蛇腹形状を展開しながらシートバック６２の表面を破断してシート後方側に進出し、上方側かつシート後方側に展開しはじめる。 In the first stage shown in FIG. 11, when the gas is supplied from the inflator 30, the gas is first supplied to the bellows folded portion 72 at the upper part and starts to expand. The bellows folded portion 72 breaks the surface of the seat back 62 while developing the bellows shape, advances to the seat rear side, and starts to expand upward and to the seat rear side.
　図１２に示す第２段階では、蛇腹折り部７２の展開が完了すると後方膨張部２１が形成される。その後ロール折り部７１にガスが供給され始めると、ロール折り部７１がロール状に折り畳まれた状態から展開すべく膨張しはじめる。このとき、膨張に伴い生じる膨張力によって、ロール折り部７１は、シート背面側に展開した後方膨張部２１から車両前方側かつ上方側へ反力を受ける。この反力によって、ロール折り部７１は、斜め上方にヘッドレスト６３を乗り越えるように展開する。つまり、先に展開して後方膨張部２１が、ロール折り部７１の展開方向を前方に促進させるための土台として機能する。また、ロール折り部７１は上述のように上向き回りで巻かれているため、下向き回りに回転して展開する。 で は In the second stage shown in FIG. 12, when the deployment of the bellows folded portion 72 is completed, the rear expanding portion 21 is formed. Thereafter, when the gas starts to be supplied to the roll folding section 71, the roll folding section 71 starts to expand from the state of being folded in the roll shape so as to be developed. At this time, the roll folding portion 71 receives a reaction force from the rear expanding portion 21 deployed on the seat rear side to the front and upper sides of the vehicle due to the expanding force generated by the expansion. By this reaction force, the roll folding part 71 is deployed so as to get over the headrest 63 diagonally upward. That is, the rear inflation portion 21 which is first developed functions as a base for promoting the deployment direction of the roll folding portion 71 forward. Moreover, since the roll folding part 71 is wound upward, as described above, it is rotated downward and deployed.
　図１３に示す第３段階では、ロール折り部７１の膨張が進み、まずは側方膨張部２２Ａ、２２Ｂが展開しはじめる。側方膨張部２２Ａ、２２Ｂは上方に膨張し、ロール折り部７１の残り部分は車両の天井に沿って前方に展開する。 で は In the third stage shown in FIG. 13, the expansion of the roll folding portion 71 proceeds, and first, the side expansion portions 22A and 22B start to expand. The lateral expansion portions 22A and 22B expand upward, and the remaining portion of the roll folding portion 71 is deployed forward along the ceiling of the vehicle.
　図１４に示す第４段階では、ロール折り部７１からまず側方膨張部２２Ａ、２２Ｂが形成されて乗員Ｄの頭部Ｈの側方を覆う。このときロール折り部７１の残り部分は、頭部Ｈより前方に進出しており、また、側方膨張部２２Ａ、２２Ｂの頭頂部２９Ａ、２９Ｂが天井に突き当たり、天井からの反力により上向きの展開方向が下向きに切り替えられ、車両天井から下方に展開しはじめる。 In the fourth stage shown in FIG. 14, first, the side inflatable portions 22A and 22B are formed from the roll folding portion 71 to cover the side of the head H of the occupant D. At this time, the remaining portion of the roll folded portion 71 has advanced forward from the head H, and the top portions 29A and 29B of the side inflatable portions 22A and 22B abut against the ceiling, and the upward force due to the reaction force from the ceiling. The deployment direction is switched downward and begins to deploy downward from the vehicle ceiling.
　そして図１５に示す第５段階では、ロール折り部７１から前方膨張部２３Ａ、２３Ｂが形成されて、乗員Ｄの頭部Ｈの前方部分も覆い、これにより乗員Ｄの前後左右方向の全方位を覆うエアバッグ２０が形成される。 In the fifth stage shown in FIG. 15, the front inflated portions 23A and 23B are formed from the roll folded portion 71, and also cover the front portion of the head H of the occupant D, whereby the occupant D can move in all directions in the front-rear and left-right directions. An overlying airbag 20 is formed.
　本実施形態に係るエアバッグ装置１０の効果を説明する。 効果 The effects of the airbag device 10 according to the present embodiment will be described.
　本実施形態のエアバッグ装置１０は、インフレータ３０と、インフレータ３０から供給されるガスにより展開するエアバッグ２０と、を備える。エアバッグ２０は、座席６０の背面側に展開する後方膨張部２１と、後方膨張部２１のシート幅方向両側から前方に延びる一対の側方膨張部２２Ａ、２２Ｂと、一対の側方膨張部２２Ａ、２２Ｂから中央側へ延び中央で相互に連結されて乗員Ｄの前方を覆う一対の前方膨張部２３Ａ、２３Ｂと、を有する。エアバッグ２０は、後方膨張部２１、側方膨張部２２Ａ、２２Ｂ、前方膨張部２３Ａ、２３Ｂの順でガス流路が形成される。 The airbag device 10 of the present embodiment includes an inflator 30 and an airbag 20 that is deployed by gas supplied from the inflator 30. The airbag 20 includes a rear inflatable portion 21 deployed on the back side of the seat 60, a pair of side inflatable portions 22A and 22B extending forward from both sides in the seat width direction of the rear inflatable portion 21, and a pair of side inflatable portions 22A. , 22B extending to the center side and connected to each other at the center to cover the front of the occupant D. In the airbag 20, a gas flow path is formed in the order of the rear inflating portion 21, the side inflating portions 22A and 22B, and the front inflating portions 23A and 23B.
　この構成により、エアバッグ装置１０の作動時にエアバッグ２０が膨張展開する際には、まず最初に後方膨張部２１を展開させることができる。これにより、図１２を参照して説明したように、先に展開して後方膨張部２１が、残り部分の展開方向を前方に促進させるための土台として機能するので、エアバッグ２０がヘッドレスト６３や乗員Ｄの頭部Ｈを越えるのに充分な膨張力と展開方向とを展開中のエアバッグ２０に与えることが可能となる。また、側方膨張部２２Ａ、２２Ｂ、前方膨張部２３Ａ、２３Ｂの順でガス流路が形成されることにより、図１４を参照して説明したように、先に側方膨張部２２Ａ、２２Ｂを展開させて、エアバッグ２０の未展開の部分が乗員Ｄの頭部Ｈより前方に移動した後に、前方膨張部２３Ａ、２３Ｂを展開させることが可能となる。これにより、ヘッドレスト６３や乗員Ｄの頭部Ｈを確実に超えるようにエアバッグ２０を展開可能となる。これらの結果、本実施形態のエアバッグ装置１０はエアバッグ２０を安定して展開できる。 With this configuration, when the airbag 20 is inflated and deployed when the airbag device 10 is operated, the rear inflatable portion 21 can be first deployed. Accordingly, as described with reference to FIG. 12, the rear inflatable portion 21 is first developed and the rear inflatable portion 21 functions as a base for promoting the deployment direction of the remaining portion to the front. It is possible to provide the inflating airbag 20 with an inflation force and a deployment direction sufficient to pass over the head H of the occupant D. Further, by forming the gas flow paths in the order of the side inflating portions 22A and 22B and the front inflating portions 23A and 23B, as described with reference to FIG. 14, the side inflating portions 22A and 22B are formed first. After the undeployed portion of the airbag 20 is moved forward from the head H of the occupant D, the front inflatable portions 23A and 23B can be deployed. Thereby, the airbag 20 can be deployed so as to reliably exceed the headrest 63 and the head H of the occupant D. As a result, the airbag device 10 of the present embodiment can stably deploy the airbag 20.
　また本実施形態のエアバッグ装置１０では、エアバッグ２０は、後方膨張部２１にインフレータからのガスが供給され、後方膨張部２１が側方膨張部２２Ａ、２２Ｂ及び前方膨張部２３Ａ、２３Ｂより先に展開される。 Further, in the airbag device 10 of the present embodiment, the airbag 20 is configured such that the gas from the inflator is supplied to the rear inflatable portion 21, and the rear inflatable portion 21 is located ahead of the side inflatable portions 22A and 22B and the front inflatable portions 23A and 23B. Will be expanded to.
　この構成により、後方膨張部２１を側方膨張部２２Ａ、２２Ｂ及び前方膨張部２３Ａ、２３Ｂより確実に早く展開させることが可能となり、エアバッグ２０の展開動作をより安定化できる。 With this configuration, the rear inflatable portion 21 can be more reliably deployed earlier than the side inflatable portions 22A, 22B and the front inflatable portions 23A, 23B, and the deployment operation of the airbag 20 can be further stabilized.
　また、本実施形態のエアバッグ装置１０では、前方膨張部２３Ａ、２３Ｂが、一対の側方膨張部２２Ａ、２２Ｂから中央側へ延び中央で相互に連結されて乗員の前方を覆う一対の拘束部２４Ａ、２４Ｂと、一対の拘束部２４Ａ，２４Ｂから前方かつ左右外側へそれぞれ延び、拘束部２４Ａ、２４Ｂの前面を覆う一対のエネルギ吸収（ＥＡ）部２５Ａ、２５Ｂと、を有する。 Further, in the airbag device 10 of the present embodiment, the front inflatable portions 23A, 23B extend from the pair of side inflatable portions 22A, 22B to the center side and are mutually connected at the center to form a pair of restraining portions that cover the front of the occupant. 24A and 24B, and a pair of energy absorption (EA) portions 25A and 25B extending forward and left and right outward from the pair of restraining portions 24A and 24B, respectively, and covering the front surfaces of the restraining portions 24A and 24B.
　この構成により、前方膨張部２３Ａ、２３Ｂは、拘束部２４Ａ、２４Ｂにより衝突時の乗員Ｄの衝撃を緩和でき、かつ、ＥＡ部２５Ａ、２５Ｂによりシート前方のハンドルなどに衝突したときの衝撃を吸収して乗員Ｄに伝わらないようにでき、乗員Ｄの保護を二重に行うことができる。 With this configuration, the front inflatable portions 23A and 23B can alleviate the impact of the occupant D at the time of the collision by the restraining portions 24A and 24B, and absorb the impact at the time of the collision with the steering wheel in front of the seat by the EA portions 25A and 25B. Thus, the occupant D can be prevented from being transmitted to the occupant D, and the occupant D can be protected twice.
　また、本実施形態のエアバッグ装置１０のエアバッグ２０の形状は、以下のように言い換えることもできる。すなわち、エアバッグ２０は、座席６０の背面側に展開する後方膨張部２１と、後方膨張部２１の座席幅方向両側から前方に延びる一対の側方膨張部２２Ａ、２２Ｂと、一対の側方膨張部２２Ａ、２２Ｂに接続されて乗員Ｄの前方を覆う前方膨張部２３Ａ、２３Ｂと、を有する。前方膨張部２３Ａ、２３Ｂは、乗員Ｄ側の内表面のうち座席６０の幅方向（ｙ方向）略中央の位置に、座席６０の上下方向（ｚ方向）に沿って延在する縫い目（前方縫製ライン５７）が設けられ、この縫い目により前方に窪んだ前方凹部２７が形成される。より詳細には、一対の前方膨張部２３Ａ、２３Ｂが、ｙ方向の略中央位置にて中央接合部７６を形成する接合縫いによってｚ方向に沿って相互に接合され、これにより前方凹部２７が形成されている。 形状 Further, the shape of the airbag 20 of the airbag device 10 of the present embodiment can be paraphrased as follows. That is, the airbag 20 includes a rear inflatable portion 21 deployed on the rear side of the seat 60, a pair of side inflatable portions 22 </ b> A, 22 </ b> B extending forward from both sides of the rear inflatable portion 21 in the seat width direction, and a pair of side inflatable portions. Front inflatable portions 23A and 23B connected to the portions 22A and 22B to cover the front of the occupant D. The front inflatable portions 23A and 23B are provided with stitches (front sewing) extending along the up-down direction (z direction) of the seat 60 at substantially the center of the seat 60 in the width direction (y direction) of the inner surface on the occupant D side. A line 57) is provided, and the seam forms the front recess 27 which is recessed forward. More specifically, the pair of front inflatable portions 23A and 23B are joined to each other along the z direction by joining stitches forming a central joint portion 76 at a substantially central position in the y direction, thereby forming the front concave portion 27. Have been.
　この構成により、頭部Ｈに対するエアバッグ２０の前方膨張部２３Ａ、２３Ｂの内表面の接触面が広くなり、また、対向角度も多様となるので、車両前方側でエアバッグ２０が衝撃吸収可能な方位を増やすことができ、乗員Ｄをより幅広い方向の衝突から保護できる。また、本実施形態では、一対の前方膨張部２３Ａ、２３Ｂの幅方向中央を接合縫いで接合することで、エアバッグ２０が図４に示したドーナツ状に形成されるので、インフレータ３０から供給されたガスがエアバッグ２０の側方から前方まで左右均等に行き渡りやすくできる。これにより、エアバッグ２０の展開をより一層安定化できる。 With this configuration, the contact surfaces of the inner surfaces of the front inflatable portions 23A and 23B of the airbag 20 with the head H are widened, and the opposing angles are also diversified, so that the airbag 20 can absorb shock at the vehicle front side. The direction can be increased, and the occupant D can be protected from a collision in a wider direction. Further, in the present embodiment, the airbag 20 is formed in the donut shape shown in FIG. 4 by joining the widthwise centers of the pair of front inflatable portions 23A and 23B by joining stitching, so that the airbag 20 is supplied from the inflator 30. The left and right gas can be easily spread evenly from side to front of the airbag 20. Thereby, the deployment of the airbag 20 can be further stabilized.
　図１６、図１７を参照して上記実施形態の変形例を説明する。図１６は、本実施形態の第１変形例に係るエアバッグ１２０の平面視の概略構成を示す模式図である。図１７は、本実施形態の第２変形例に係るエアバッグ２２０の平面視の概略構成を示す模式図である。 A modified example of the above embodiment will be described with reference to FIGS. FIG. 16 is a schematic diagram illustrating a schematic configuration of the airbag 120 according to a first modification of the present embodiment in plan view. FIG. 17 is a schematic diagram illustrating a schematic configuration of an airbag 220 according to a second modification of the present embodiment in plan view.
　エアバッグ２０の形状は上記実施形態のものに限られない。例えば図１６に示すエアバッグ１２０のように、ＥＡ部２５Ａ、２５Ｂの更に先端側に第２ＥＡ部２８Ａ、２８Ｂを設けてもよい。この場合、前方膨張部１２３Ａ、１２３Ｂは上方から視たときに略三角形状に展開する。このようにＥＡ部を増やすことにより、エアバッグ２０のＥＡ特性を変更できる。また、図１７に示すエアバッグ２２０のように、前方膨張部２２３Ａ、２２３ＢがＥＡ部２５Ａ、２５Ｂを備えない構成でもよい。 形状 The shape of the airbag 20 is not limited to the above embodiment. For example, like the airbag 120 shown in FIG. 16, the second EA portions 28A and 28B may be provided further on the distal end side of the EA portions 25A and 25B. In this case, the front inflatable portions 123A and 123B expand in a substantially triangular shape when viewed from above. By increasing the number of EA portions in this manner, the EA characteristics of the airbag 20 can be changed. Further, like the airbag 220 shown in FIG. 17, the front inflatable portions 223A and 223B may not have the EA portions 25A and 25B.
　以上、具体例を参照しつつ本実施形態について説明した。しかし、本開示はこれらの具体例に限定されるものではない。これら具体例に、当業者が適宜設計変更を加えたものも、本開示の特徴を備えている限り、本開示の範囲に包含される。前述した各具体例が備える各要素およびその配置、条件、形状などは、例示したものに限定されるわけではなく適宜変更することができる。前述した各具体例が備える各要素は、技術的な矛盾が生じない限り、適宜組み合わせを変えることができる。 The embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those in which those skilled in the art appropriately change the design of these specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. The components included in the specific examples described above and the arrangement, conditions, shapes, and the like of the components are not limited to those illustrated, and can be appropriately changed. The elements included in each of the specific examples described above can be appropriately changed in combination as long as there is no technical contradiction.
　上記実施形態では、エアバッグ装置１０の収容部４０がシートバック６２内に格納される構成を例示したが、収容部４０をヘッドレスト６３の内部に格納する構成でもよい。 In the above-described embodiment, the configuration in which the storage unit 40 of the airbag device 10 is stored in the seatback 62 has been described, but the configuration in which the storage unit 40 is stored in the headrest 63 may be used.
　上記実施形態では、エアバッグ２０として複数のパネルを縫製して一体的に形成する構造のものを例示したが、いわゆる一体製織（ｏｎｅ　ｐｉｅｃｅ　ｗｏｖｅｎ：ＯＰＷ）型のものでもよい。 In the above-described embodiment, the airbag 20 has a structure in which a plurality of panels are sewn and integrally formed. However, the airbag 20 may be a so-called one-piece woven (OPW) type.
　本国際出願は２０１８年６月２２日に出願された日本国特許出願２０１８－１１９０２１号に基づく優先権を主張するものであり、２０１８－１１９０２１号の全内容をここに本国際出願に援用する。 This international application claims priority based on Japanese Patent Application No. 2018-119021 filed on June 22, 2018, and the entire contents of 2018-119021 are incorporated herein by reference.
　１０　　エアバッグ装置
　２０、１２０、２２０　　エアバッグ
　２１　　後方膨張部
　２２Ａ、２２Ｂ　　側方膨張部
　２３Ａ、２３Ｂ、１２３Ａ、１２３Ｂ、２２３Ａ、２２３Ｂ　　前方膨張部
　２４Ａ、２４Ｂ　　拘束部
　２５Ａ、２５Ｂ　　ＥＡ部
　２６　　インフレータ挿入口
　２７　　前方凹部
　２８Ａ、２８Ｂ　　第２ＥＡ部
　２９Ａ、２９Ｂ　　頭頂部
　３０　　インフレータ
　４０　収容部
　７１　　ロール折り部
　７２　　蛇腹折り部
　６０　　座席
　６１　　座部
　６２　　シートバック
　６３　　ヘッドレスト
　６４　　フレーム
　Ｄ　　乗員
　Ｈ　　頭部 DESCRIPTION OF SYMBOLS 10 Airbag apparatus 20, 120, 220 Airbag 21 Rear inflation part 22A, 22B Side inflation part 23A, 23B, 123A, 123B, 223A, 223B Front inflation part 24A, 24B Restraining part 25A, 25B EA part 26 Inflator insertion port 27 Front recess 28A, 28B 2nd EA part 29A, 29B Head part 30 Inflator 40 Housing part 71 Roll folding part 72 Bellows folding part 60 Seat 61 Seat 62 Seat back 63 Headrest 64 Frame D Occupant H Head

Claims (7)

  1. 　インフレータと、
    　前記インフレータから供給されるガスにより展開するエアバッグと、
    を備え、
    　前記エアバッグは、
    　座席の背面側に展開する後方膨張部と、前記後方膨張部の座席幅方向両側から前方に延びる一対の側方膨張部と、前記一対の側方膨張部から中央側へ延び中央で相互に連結されて乗員の前方を覆う一対の前方膨張部と、を有し、
    　前記エアバッグは、前記後方膨張部、前記側方膨張部、前記前方膨張部の順でガス流路が形成される、
    エアバッグ装置。     An inflator,
    An airbag deployed by gas supplied from the inflator,
    With
    The airbag,
    A rear inflatable portion that extends to the back side of the seat, a pair of side inflatable portions that extend forward from both sides of the rear inflatable portion in the seat width direction, and are interconnected at the center extending from the pair of side inflatable portions toward the center. And a pair of front inflatable portions that cover the front of the occupant,
    In the airbag, a gas flow path is formed in the order of the rear inflation portion, the side inflation portion, and the front inflation portion.
    Airbag device.
  2. 　前記エアバッグは、
    　前記後方膨張部に前記インフレータからのガスが供給され、
    　前記後方膨張部が前記側方膨張部及び前記前方膨張部より先に展開される、
    請求項１に記載のエアバッグ装置。     The airbag,
    Gas from the inflator is supplied to the rear inflation portion,
    The rear inflatable portion is deployed before the side inflatable portion and the front inflatable portion,
    The airbag device according to claim 1.
  3. 　前記前方膨張部が、前記一対の側方膨張部から中央側へ延び中央で相互に連結されて乗員の前方を覆う一対の拘束部と、前記一対の拘束部から前方かつ左右外側へそれぞれ延び、前記拘束部の前面を覆う一対のエネルギ吸収（ＥＡ）部と、を有する、
    請求項１に記載のエアバッグ装置。     The front inflatable portion extends from the pair of lateral inflatable portions to the center side and is connected to each other at the center to cover the front of the occupant, and extends forward and left and right outward from the pair of restraint portions, respectively. A pair of energy absorbing (EA) sections covering a front surface of the restraining section.
    The airbag device according to claim 1.
  4. 　前記エアバッグが、
    　前記一対のＥＡ部の先端からさらに前記側方膨張部の方向へ延びる一対の第２ＥＡ部を有する、
    請求項３に記載のエアバッグ装置。     The airbag,
    It has a pair of 2nd EA part which further extends in the direction of the side expansion part from the tip of the pair of EA parts,
    The airbag device according to claim 3.
  5. 　シートバックまたはヘッドレストに配置され、前記インフレータによりガスが供給される前の非作動時の前記エアバッグを収容する収容部を備える、
    請求項１に記載のエアバッグ装置。     A storage portion that is disposed on a seat back or a headrest and that stores the airbag at the time of non-operation before gas is supplied by the inflator,
    The airbag device according to claim 1.
  6. 　前記収容部に収容される状態の前記エアバッグは、展開時の前記前方膨張部側から前記側方膨張部側へ巻くようにロール状に折り畳まれた状態で前記収容部に収容されるロール折り部と、展開時の前記後方膨張部を蛇腹状に折り畳み前記ロール折り部より上方に収容される蛇腹折り部とを含む、
    請求項５に記載のエアバッグ装置。     The airbag in the state accommodated in the accommodation portion is folded in a roll shape so as to be wound from the front inflating portion side to the side inflating portion side when deployed, and is roll-encased in the accommodation portion. And a bellows-folded portion that is folded in a bellows shape when the rear inflated portion is expanded to be accommodated above the roll-folded portion,
    The airbag device according to claim 5.
  7. 　インフレータと、
    　前記インフレータから供給されるガスにより展開するエアバッグと、
    を備え、
    　前記エアバッグは、
    　座席の背面側に展開する後方膨張部と、前記後方膨張部の座席幅方向両側から前方に延びる一対の側方膨張部と、前記一対の側方膨張部に接続されて乗員の前方を覆う前方膨張部と、を有し、
    　前記前方膨張部は、前記乗員側の内表面のうち前記座席の幅方向略中央の位置に、前記座席の上下方向に沿って延在する縫い目が設けられ、前記縫い目により前方に窪んだ前方凹部が形成される、
    エアバッグ装置。     An inflator,
    An airbag deployed by gas supplied from the inflator,
    With
    The airbag,
    A rear inflatable portion that extends to the back side of the seat, a pair of side inflatable portions extending forward from both sides in the seat width direction of the rear inflatable portion, and a front portion that is connected to the pair of side inflatable portions and covers the front of the occupant. An inflatable portion,
    The front inflatable portion is provided with a stitch extending along the up-down direction of the seat at a position substantially at the center in the width direction of the seat on the inner surface on the occupant side, and a front recess depressed forward by the stitch. Is formed,
    Airbag device.
PCT/JP2019/023456 2018-06-22 2019-06-13 Airbag device WO2019244763A1 (en)

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