JP2006096101A - Airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device which can realize prompt deployment and expansion of an airbag in the lower and the right and left directions at the rearmost part of a vehicle interior. <P>SOLUTION: The airbag device is provided with the airbag 12. Then a gas inflow opening 22, which infuses expansion gas into the airbag 12, is provided at the upper midsection of the airbag 12. Then a right and left passage 26, a first outer peripheral passage 27, an up-and-down passage 28, and a second outer peripheral passage 29 are provided within the air bag 12. The right and left passage 26 guides the expansion gas flown from the gas inflow opening 22 to the interior on the left end 31 and to the interior on the right end 32. Then the first outer peripheral passage 27 guides the expansion gas flown from the right and left passage 26 to both of the corners 33 at the lower end along the right and left outer peripheral edges. Then the up-and-down passage 28 is extended downward from the gas inflow opening 22, and guides the expansion gas flown from the gas inflow opening 22 to the midsection 34 at the lower end. Then the second outer peripheral passage 29 is connected to the up-and-down passage 28, and guides the expansion gas flown from the up-and-down passage 28 to both of the corners 33 at the lower end along the peripheral edge at the lower end. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an airbag device that protects a passenger by deploying and inflating an airbag at the rearmost part of a vehicle compartment.

Conventionally, as this type of airbag device, one in which an airbag is accommodated in a folded state in a roof at a rear portion of a passenger compartment is known (for example, see Patent Document 1). In this airbag apparatus, the airbag is configured to be deployed and inflated between the rearmost seat and the rear window glass, that is, at the rearmost portion of the passenger compartment, by supplying inflation gas. Therefore, in the airbag in such an airbag apparatus, the flow path of the inflation gas is partitioned and formed by sewing between the inner surfaces of the airbag.
JP 2004-58849 A

  By the way, in this kind of airbag apparatus, it is necessary to rapidly expand and inflate the entire airbag based on the supply of the inflation gas, and to quickly cover a predetermined region (entire region of the rear window) at the rearmost portion of the passenger compartment by the airbag. . In this regard, in the airbag device disclosed in Patent Document 1, the flow path of the inflation gas in the airbag removes the inflation gas flowing from the gas inlet provided in the upper center portion of the airbag from the left and right outer peripheral edges in the airbag. After reaching the lower corners of the airbag through the flow path formed in the above, the airbag is configured to reach the central portion of the airbag through the outer peripheral edge of the lower end of the airbag. For this reason, when the inflation gas reaches the lower corners of the airbag, the central portion of the airbag cannot be sufficiently deployed and inflated. There has been a problem that rapid deployment and inflation of the airbag in the lower and left-right directions cannot be realized.

  The present invention has been made in view of such conventional circumstances, and an object of the present invention is to provide an airbag device capable of realizing rapid deployment and inflation in the lower and left-right directions of the airbag at the rearmost portion of the passenger compartment. There is to do.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided an airbag device in which an airbag is deployed and inflated downward and in the left-right direction at the rearmost portion of the passenger compartment by supplying inflation gas. A gas inlet for allowing the inflation gas to flow into the airbag is provided at a portion, and the airbag is extended in the left-right direction from the gas inlet, and the inflation gas flowing from the gas inlet is airbag The left and right flow paths leading to the left and right outer peripheral edges, and the left and right flow paths communicate with the left and right flow paths, and the inflation gas flowing in from the left and right flow paths is guided to the lower corners of the airbag along the left and right outer peripheral edges. A pair of left and right first outer peripheral channels, an upper and lower channel extending downward from the gas inlet, and leading the inflation gas flowing in from the gas inlet to the outer periphery of the lower end in the airbag; and the upper and lower channels; Communicating, flowing from the same upper and lower flow path It was inflation gas along the lower end outer peripheral edge of the airbag and gist in that a second peripheral channels leading to lower both corners in the airbag.

  According to this configuration, the inflation gas flowing in from the gas inlet is guided to the left and right outer peripheral edges in the airbag through the left and right flow paths, so that the upper portion of the airbag is rapidly deployed and inflated in the left and right direction. Subsequently, the inflation gas that has reached the left and right outer peripheral edges in the airbag is guided to the lower corners of the airbag through the first outer peripheral flow path, so that the left and right outer peripheral edges of the airbag are rapidly expanded and inflated downward. Is done. On the other hand, the inflation gas flowing in from the gas inlet is guided to the outer peripheral edge at the lower end in the airbag through the upper and lower flow paths, so that the central portion of the airbag is rapidly deployed and inflated downward. Subsequently, the inflation gas that has reached the outer peripheral edge of the lower end in the airbag is guided to both corners of the lower end of the airbag through the second outer peripheral flow path, so that the outer peripheral edge of the lower end of the airbag is quickly deployed in the left-right direction. Inflated.

  According to a second aspect of the present invention, in the first aspect of the invention, the first outer peripheral flow path and the second outer peripheral flow path are communicated with each other at both lower corners in the airbag, and the second outer peripheral flow path is provided. The flow path width is narrower in the vicinity of the lower end corners in the second outer peripheral flow path than in the communication area with the upper and lower flow paths in the second outer peripheral flow path and in the vicinity of the lower end corners of the first outer peripheral flow path. The gist is that it was formed.

  According to this configuration, the inflation gas that is about to flow into the second outer peripheral flow path from the first outer peripheral flow path through the lower end corners is suppressed from flowing into the second outer peripheral flow path from the lower end both corners. It stays in the vicinity of the lower corners of the bag. Further, the inflating gas that is about to flow into the lower corners from the second outer circumferential channel is suppressed from flowing into the lower corners from the second outer circumferential channel, and is retained at the lower outer periphery of the airbag. .

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the airbag is partitioned by the left and right flow paths, the first outer peripheral flow path, the upper and lower flow paths, and the second outer peripheral flow path. The gist of the present invention is that the left compartment and the right compartment are formed so as to communicate with only the upper and lower flow paths, and the expansion gas flows into the respective compartments from the upper and lower flow paths.

  According to this configuration, the expansion gas is supplied to each compartment while ensuring a sufficient flow rate of the expansion gas guided to the first outer peripheral flow path through the left and right flow paths. For this reason, the airbag is rapidly expanded and inflated in the left-right direction and downward by the left and right flow paths and the first outer peripheral flow path, and the portion between the flow paths of the airbag is quickly filled with the inflation gas.

The gist of the invention of claim 4 is that, in the invention of claim 3, the left end of the left compartment and the right end of the right compartment are formed to extend downward.
According to this configuration, the inflation gas that has flowed into each compartment functions effectively as a force for deploying and inflating the portion between the flow paths downward in the airbag.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the pair of left and right first outer peripheral flow paths extend outward in the left and right directions toward the lower end. The gist is the formation.

According to this configuration, the inflation and inflation of the airbag is promoted not only downward but also in the left-right direction by the inflation gas passing through the first outer peripheral flow path.
According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the airbag is deployed and inflated between an upper portion of the passenger compartment and an upper portion of the backrest portion of the rearmost seat. This is the gist.

  According to this configuration, the range in which the airbag is deployed and inflated downward is between the upper portion of the passenger compartment and the upper portion of the backrest portion. Therefore, compared with the case where the airbag is deployed and inflated to the entire rearmost portion of the passenger compartment. The entire bag can be quickly deployed and inflated. Therefore, the airbag can quickly cover a portion where the occupant is not protected by the backrest portion, while using the backrest portion as a protection member for the occupant.

  According to the present invention, it is possible to realize rapid deployment and inflation of the airbag at the rearmost portion of the passenger compartment in the lower and left-right directions.

Hereinafter, an embodiment in which the present invention is embodied in an airbag device attached to a box type vehicle will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the airbag device 11 includes an airbag 12 that expands and inflates downward and in the left-right direction at the rearmost portion of the passenger compartment, and an inflator 13 that generates inflation gas. The airbag device 11 is configured as a device that protects a passenger seated in the rearmost seat 15 among seats arranged in the front-rear direction of the box-type vehicle 14. In the following description, the top, bottom, left, and right of the airbag 12 included in the airbag device 11 are the same as the top, bottom, left, and right when the rearmost part of the passenger compartment is viewed from the front to the rear of the vehicle 14.

  The inflator 13 included in the airbag device 11 is connected to the sensor 17 via the control device 16. The sensor 17 is attached to the rear end portion of the vehicle 14, for example, the rear bumper 18, and detects an impact at the rear portion of the vehicle 14 or predicts a collision with the rear portion of the vehicle 14. The inflator 13 is configured to generate inflation gas when a drive current is input from the control device 16 to the inflator 13 based on the signal from the sensor 17.

  The airbag device 11 is accommodated in a roof 19 at the rear of the passenger compartment, with the airbag 12 folded in a downward and left-right direction so as to be deployed and inflatable. More specifically, the roof 19 includes a roof panel 19a as an exterior member and a roof head lining 19b as an interior member. Inside the roof panel 19a, a roof head lining 19b extends substantially parallel to the roof panel, and a predetermined gap is provided between the roof panel 19a and the roof head lining. The airbag 12 and the inflator 13 are mounted between the roof panel 19a and the roof head lining.

  In the airbag device 11, the inflation gas generated from the inflator 13 is supplied into the airbag 12, so that the airbag 12 is deployed and inflated between the rearmost seat 15 and the rear window 20 in the vehicle interior. . More specifically, the airbag 12 is deployed and inflated between the upper part of the vehicle compartment and the upper part of the backrest part 15a of the rearmost seat 15 in the vertical direction, and a pair of rear pillars positioned at the rearmost part of the body side part in the left-right direction. Deploy and expand over 21.

  As shown in FIG. 3, the airbag 12 is formed into a bag shape by a base fabric such as a woven fabric, and is formed so as to form a substantially horizontally long rectangular shape, that is, a shape along the rearmost part of the passenger compartment when spread in a flat shape. ing. More specifically, the airbag 12 is formed in a bag shape by stitching between the outer peripheral edges of the two front and back base fabrics, and the airbag 12 when opened in a plane has a substantially symmetrical shape. Moreover, the airbag 12 when it is spread out in a planar shape is formed such that the length in the left-right direction is longer as it goes from the upper part to the lower part, that is, the width of the airbag 12 is increased.

  A gas inlet 22 through which inflation gas generated from the inflator 13 flows into the airbag 12 is provided at the upper center portion of the airbag 12. A tubular connecting part 23 is connected to the gas inlet 22, and the inflator 13 is connected to the connecting part 23 via a gas supply pipe (not shown). The inflator 13 is held in the roof 19, and the inflation gas generated from the inflator 13 is configured to flow into the airbag 12 from the gas inlet 22 through the gas supply pipe and the connecting portion 23. In addition, on both the left and right sides of the connecting portion 23, a disposing portion 24 where the inflator 13 is disposed is provided so as to extend in the left-right direction. Further, a pair of attachment pieces 25 for attaching the airbag 12 to the inside of the roof 19 of the vehicle 14 are provided on both the left and right sides of the gas inlet 22. In addition, the connection part 23 and the attachment piece 25 are integrally formed with the base fabric.

  In the airbag 12, left and right channels 26, a first outer circumferential channel 27, an upper and lower channel 28, a second outer circumferential channel 29, and a third outer circumferential channel 30, which serve as inflation gas channels, are provided. These flow paths 27, 28, 29, and 30 are formed by stitching between the inner surfaces of the two base fabrics.

  The left and right flow paths 26 are provided so as to extend in the left and right direction from directly below the gas inlet 22, and the left and right flow paths 26 are extended to the left end inside 31 and the right end inside 32 at the left and right outer peripheral edges in the airbag 12. . The left and right channels 26 are channels that guide the expanded gas flowing in from the gas inlet 22 to the left end interior 31 and the right end interior 32.

  The first outer peripheral flow path 27 is a flow path that communicates with the left and right flow paths 26 in the left end interior 31 and the right end interior 32. A pair of left and right first outer peripheral flow paths 27 are provided along the left and right outer peripheral edges in the airbag 12, and are extended to both lower corners 33 in the airbag 12. Specifically, the first outer peripheral flow path 27 is provided so as to extend outward in the left-right direction toward the lower end so as to follow the shape of the left-right outer peripheral edge of the airbag 12. The first outer peripheral flow path 27 is a flow path that guides the inflated gas flowing in from the left and right flow paths 26 to the lower corners 33 in the airbag 12 along the left and right outer peripheral edges in the airbag 12.

  On the other hand, the upper and lower flow paths 28 are provided so as to extend downward from the gas inlet 22, and the upper and lower flow paths 28 are extended to the lower end central portion 34 at the outer peripheral edge of the lower end in the airbag 12. The upper and lower flow path 28 is a flow path that guides the inflation gas flowing in from the gas inflow port 22 to the lower end central portion 34 at the lower outer periphery of the airbag 12.

  The second outer peripheral flow path 29 is a flow path that communicates with the upper and lower flow paths 28 at the lower end central portion 34. The second outer peripheral flow path 29 is provided so as to extend in the left-right direction from the lower end central portion 34 in the airbag 12 along the outer periphery of the lower end. The second outer peripheral flow path 29 extends to the lower end both corners 33 in the airbag 12, and communicates with the first outer peripheral flow path 27 at the lower end both corners 33. The second outer peripheral flow path 29 is a flow path that guides the inflated gas flowing in from the upper and lower flow paths 28 to the lower corners 33 in the airbag 12 along the outer peripheral edge at the lower end in the airbag 12.

  In the middle portion of the airbag 12 (that is, between each of the flow paths 26 to 29), a pair of left and right left compartments by the left and right flow paths 26, the first outer peripheral flow path 27, the upper and lower flow paths 28, and the second outer peripheral flow path 29. 35 and a right compartment 36 are defined. The left compartment 35 and the right compartment 36 are formed so as to extend in the left-right direction from both sides of the vertical flow path 28. Further, the left end portion of the left compartment 35 and the right end portion of the right compartment 36 are formed to extend downward. The left end of the left compartment 35 and the right end of the right compartment 36 are formed so as to extend downward, so that the left and right ends of the second outer peripheral passage 29 (the lower corners of the second outer passage) A pair of constricted portions 37 is formed in the vicinity of the portion. The pair of narrowed portions 37 includes a central portion of the second outer peripheral flow passage 29 (a communication portion with the upper and lower flow passages in the second outer peripheral passage) and both lower end portions of the first outer peripheral flow passage 27 (the above-mentioned in the first outer peripheral passage). It is formed so that the flow path width becomes narrower than the vicinity of the lower end corners).

  At the right end of the left compartment 35 and the left end of the right compartment 36, communication portions 38 that communicate with the upper and lower flow paths 28 are formed. The left compartment 35 and the right compartment 36 are configured to expand when inflation gas flowing through the upper and lower flow passages 28 flows from the communication portion 38. The left compartment 35 and the right compartment 36 communicate with only the upper and lower flow paths 28 through the communication portions 38, respectively. That is, the left compartment 35 and the right compartment 36 are not communicated with the other flow paths and the lower corners 33 in the airbag 12 by sewing the pair of base fabrics except for the communication portion 38. It is configured.

  On the other hand, a third outer peripheral flow passage 30 extending in the left-right direction along the outer peripheral edge of the upper end is provided on the upper end portion in the airbag 12, that is, above the arrangement portion 24. Both end portions of the third outer peripheral flow path 30 are provided so as to extend downward, and the both end portions extend to the left end inside 31 and the right end inside 32 in the airbag 12. The third outer circumferential channel 30 communicates with the left and right channels 26 and the first outer circumferential channel 27 at the left end inner portion 31 and the right end inner portion 32. The third outer peripheral flow path 30 is a flow path that guides the inflation gas flowing in from the left and right flow paths 26 to the outer peripheral edge at the upper end in the airbag 12.

Next, operation | movement of the airbag apparatus 11 of this embodiment is demonstrated.
For example, when a predetermined impact or more is applied to the rear portion of the vehicle 14 shown in FIGS. 1 and 2, a drive current is output from the control circuit to the inflator 13 based on a detection signal from the sensor 17. Then, a gas is generated from the inflator 13 by this drive current, and the gas flows into the airbag 12 from the gas inlet 22 through the connection portion 23 as an inflation gas.

  The expanded gas flowing in from the gas inlet 22 is guided in the left-right direction from the gas inlet 22 through the left and right flow paths 26 and reaches the left end inside 31 and the right end inside 32. Then, the upper part in the airbag 12 is expanded and inflated in the left-right direction. Subsequently, the expanded gas that has reached the left end inside 31 and the right end inside 32 is diverted to the first outer peripheral flow path 27 side and the third outer peripheral flow path 30 side. The inflation gas that has flowed into the first outer peripheral flow path 27 side is guided to the lower corners 33 in the airbag 12 through the first outer peripheral flow path 27. Then, the left and right outer peripheral edges of the airbag 12 are rapidly deployed and inflated downward. Further, the inflation gas flowing into the third outer peripheral flow path 30 expands and inflates a portion of the airbag 12 where the third outer peripheral flow path 30 is provided (that is, an upper portion of the disposition portion 24).

  On the other hand, the inflation gas that has flowed in from the gas inlet 22 is also guided downward in the airbag 12 through the upper and lower flow paths 28 and reaches the lower end central portion 34 in the airbag 12. Then, the central portion of the airbag 12 is rapidly deployed and inflated downward. Subsequently, the inflated gas that has reached the lower end central portion 34 in the airbag 12 is guided to the lower end corner portions 33 through the second outer peripheral flow passage 29. Then, the outer peripheral edge at the lower end of the airbag 12 is rapidly deployed and inflated in the left-right direction. As shown in FIG. 4, the airbag is deployed and inflated so as to cover the rear window 20 and the rear pillar 21 at the rearmost part of the vehicle, and the passenger sitting on the rearmost seat 15 is protected.

The effects exhibited by this embodiment will be described below.
(1) In the airbag 12 of the airbag apparatus 11 in the present embodiment, a left and right channel 26, a first outer channel 27, an upper and lower channel 28, and a second outer channel 29 are provided. According to this configuration, the upper portion of the airbag 12 is quickly deployed and inflated in the left-right direction by the inflation gas passing through the left and right flow paths 26 and the first outer peripheral flow path 27, and the left and right outer peripheral edges of the airbag 12 are lowered. Quickly expands and expands. At this time, the central portion of the airbag 12 is rapidly expanded and inflated downward by the inflation gas passing through the vertical flow path 28 and the second outer peripheral flow path 29, and the lower peripheral edge of the airbag 12 is quickly expanded in the left-right direction. Expanded and expanded. That is, the airbag 12 is expanded and inflated in the left-right direction, the center portion is downward, the left and right outer peripheral edges are downward, and the lower end outer peripheral edge is horizontally expanded. Rapidly expands and expands. As a result, it is possible to realize rapid deployment and inflation in the lower and left-right directions at the rearmost part of the passenger compartment of the airbag 12.

  (2) The throttle portions 37 are formed at the left and right end portions of the second outer peripheral flow path 29. These throttle portions 37 are formed narrower than the central portion of the second outer peripheral flow path 29 and the lower end portions of the first outer peripheral flow path 27. According to this configuration, the inflation gas that tends to flow from the first outer peripheral flow path 27 into the second outer peripheral flow path 29 through the lower end corners 33 in the airbag 12 and the second outer peripheral flow path 29 in the airbag 12. The expansion gas that is going to flow into the first outer circumferential flow path 27 through both lower corners 33 is retained in the vicinity of the throttle portion 37 of the second outer circumferential flow path 29. Therefore, the pressure of the inflation gas in the first outer peripheral channel 27 and the second outer peripheral channel 29 is increased, and the tension acts effectively on the central portion of the airbag 12 by the left and right outer peripheral edges and the lower end outer peripheral edge of the airbag 12. . Therefore, the airbag 12 is stabilized in a fully deployed state, and the passenger can be effectively protected.

  (3) The left compartment 35 and the right compartment 36 are configured so that the inflation gas flows into the left compartment 35 and the right compartment 36 from the upper and lower passages 28 by communicating with only the upper and lower passages 28, respectively. Has been. According to this configuration, the expansion gas is supplied to the left compartment 35 and the right compartment 36 while ensuring a sufficient flow rate of the expansion gas guided to the first outer peripheral passage 27 through the left and right passages 26. . Therefore, the airbag 12 is rapidly expanded and inflated in the left-right direction and downward by the left and right flow paths 26 and the first outer peripheral flow path 27, and the intermediate portion of the airbag 12 is quickly filled with the inflation gas. Therefore, the protection performance of the entire airbag 12 can be effectively exhibited.

  (4) By forming the left end portion of the left compartment 35 and the right end portion of the right compartment 36 so as to extend downward, the inflated gas flowing into the compartments 35 and 36 is transferred to the middle portion of the airbag 12 (that is, The diaphragms 37 can be effectively used as a force for expanding and expanding the flow paths 26 to 29 downward, and the throttle portions 37 can be easily formed at the left and right ends of the second outer peripheral flow path 29.

  (5) Since the pair of left and right first outer peripheral channels 27 are formed so as to extend outward in the left and right directions downward, respectively, the inflation and expansion of the airbag 12 is performed by the inflation gas passing through the first outer peripheral channel 27. Is promoted not only downward but also in the left-right direction. Accordingly, it is possible to realize further rapid deployment and inflation in the lower and left-right directions at the rearmost part of the passenger compartment of the airbag 12.

  (6) The airbag 12 is configured to be deployed and inflated between the upper part of the passenger compartment and the upper part of the backrest part 15a of the rearmost seat 15. According to this configuration, the range in which the airbag 12 is deployed and inflated downward is between the upper portion of the passenger compartment and the upper portion of the backrest portion 15a. Therefore, compared with the case where the airbag 12 is deployed and inflated in the entire rearmost part of the vehicle compartment, the entire airbag 12 can be rapidly deployed and inflated. Therefore, the airbag 12 can quickly cover a portion where the occupant is not protected by the backrest portion 15a while using the backrest portion 15a as a protection member for the occupant. As a result, the passenger's head protruding from the backrest 15a can be effectively protected.

(7) The inflator 13 is disposed in the disposition portion 24, and a third outer peripheral flow path 30 is disposed above the disposition portion 24. Therefore, the inflator 13 can be covered when the airbag 12 is deployed and inflated by deploying and inflating the third outer peripheral flow path 30. As a result, the inflator 13 can be prevented from interfering with the passenger.
(Modification)
The embodiment may be modified as follows.

The widths of the left and right channels 26, the first outer channel 27, the upper and lower channels 28, and the second outer channel 29 may be changed as appropriate.
The left compartment 35 and the right compartment 36 may be communicated with channels other than the upper and lower channels 28.

The first outer peripheral flow path 27 may be provided so as to extend, for example, in the downward direction from the left end inside 31 and the right end inside 32 in accordance with the shape of the airbag 12.
-The third outer peripheral flow path 30 may be omitted.

The left and right flow paths 26, the first outer peripheral flow path 27, the upper and lower flow paths 28, and the second outer peripheral flow path 29 may be partitioned by a tether that connects the two front and back base fabrics.
-The 1st outer periphery flow path 27 and the 2nd outer periphery flow path 29 should just be the structure each extended to the lower end both corners 33 of the airbag 12, and both flow paths 27 and 29 are not necessarily connected with each other. It does not have to be.

The technical idea that can be grasped from the embodiment will be described below.
A third outer peripheral channel that communicates with the left and right channels at the top of the airbag and guides inflation gas flowing from the left and right channels along the outer periphery of the upper end in the airbag; The airbag device according to any one of claims 1 to 6, wherein an inflator that generates the inflation gas is disposed outside the airbag between the left and right flow paths. According to this structure, it can suppress that the inflator 13 interferes with a passenger.

The side view which shows the rear part of the vehicle with which the airbag apparatus of this embodiment was mounted | worn. The rear view of the vehicle. The top view which shows an airbag. Sectional drawing which shows the rear part of a vehicle.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Airbag apparatus, 12 ... Airbag, 15 ... Back seat, 15a ... Backrest part, 22 ... Gas inlet, 26 ... Left-right flow path, 27 ... 1st outer periphery flow path, 28 ... Up-down flow path, 29 ... 2nd outer periphery flow path, 33 ... Lower end both corners, 35 ... Left compartment, 36 ... Right compartment.

Claims (6)

In the airbag device in which the airbag is deployed and inflated downward and in the left-right direction at the rearmost portion of the passenger compartment by supplying inflation gas
A gas inlet for allowing the inflation gas to flow into the airbag is provided in the upper center portion of the airbag,
In the airbag,
Left and right flow paths that extend in the left-right direction from the gas inlet and guide the inflation gas flowing in from the gas inlet to the left and right outer peripheral edges in the airbag,
A pair of left and right first outer peripheral channels that communicate with the left and right channels and guide inflation gas flowing from the left and right channels to the lower corners of the airbag along the left and right outer peripheral edges of the airbag;
An upper and lower flow path that extends downward from the gas inlet and guides the inflation gas that has flowed in from the gas inlet to the outer periphery of the lower end in the airbag;
A second outer peripheral flow path is provided which communicates with the upper and lower flow paths and guides inflation gas flowing in from the upper and lower flow paths to both lower corners of the airbag along the outer peripheral edge of the lower end in the airbag. Air bag device. The first outer peripheral flow path and the second outer peripheral flow path are communicated with each other at the lower end corners in the airbag, and the vicinity of the lower end both corners of the second outer peripheral flow path is defined in the second outer peripheral flow path. 2. The airbag according to claim 1, wherein a flow path width is narrower than a portion communicating with the upper and lower flow passages and a portion near the lower corners of the first outer circumferential flow passage. apparatus. A left compartment and a right compartment defined by the left and right passages, the first outer peripheral passage, the upper and lower passages, and the second outer peripheral passage are formed in the airbag so as to communicate with only the upper and lower passages, respectively. The airbag apparatus according to claim 1, wherein an inflation gas flows into the compartments from the upper and lower flow paths. The airbag device according to claim 3, wherein a left end portion of the left compartment and a right end portion of the right compartment are formed to extend downward. 5. The airbag device according to claim 1, wherein each of the pair of left and right first outer peripheral flow paths is formed so as to extend outward in the left and right directions toward the lower end. The airbag device according to any one of claims 1 to 5, wherein the airbag is deployed and inflated between an upper portion of a passenger compartment and an upper portion of a backrest portion of a rearmost seat.

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