JP2008195333A - Airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device of low cost capable of speedily inflating and deploying a widthwise central part of an airbag downward and efficiently inflating and deploying the airbag. <P>SOLUTION: This airbag device 15 is furnished with the airbag 20 to inflate and deploy between a seat 2 of the rear-most part and a rear part glass 6. The airbag 20 is furnished with; a gas supply port 22a positioned on the widthwise central part of an upper part of the airbag 20, a vertical direction channel 24 extended downward from the gas supply port 22a in an inflated and deployed state, a plurality of lateral direction channels 25 to 28 with fore ends closed, arranged vertically from the vertical direction channel 24 and branched to the left and right sides in an inflated and deployed state and; a non-inflating part B not to inflate which is positioned between the lateral direction channels 25 to 28 vertically adjacent to each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an airbag apparatus including an airbag that is inflated and deployed between a rear seat and a rear glass by supplying an inflation gas by a collision.

  As a conventional technique, for example, as disclosed in Patent Document 1, it is housed between a roof panel (22 in FIG. 3 of Patent Document 1) and a roof head lining (23 in FIG. 3 of Patent Document 1). The airbag (31 in FIG. 3 of Patent Document 1) is deployed along the rear window glass (25a in FIG. 3 of Patent Document 1) behind the rearmost seat (27 in FIG. 3 of Patent Document 1). There is known an airbag apparatus configured as described above and configured to absorb an impact on an occupant seated in a rearmost seat.

Japanese Unexamined Patent Application Publication No. 2004-123082 (see FIGS. 3, 5 and 6)

  In the airbag device of Patent Document 1, the airbag is configured by a base fabric (40 in FIG. 6 of Patent Document 1) formed in a bag shape, and a connection portion (Patent Document) provided on the upper portion of the base fabric. When the gas from the inflator (32 in FIG. 5 of Patent Document 1) is supplied to 41 in FIG. 6 of FIG. 1, the gas is supplied to the plurality of flow paths formed by stitching, and the airbag is inflated and deployed. It is configured as follows.

  In Patent Document 1, when a gas is supplied from a connecting portion, a part of the gas supplied from the connecting portion flows in a left-right flow path provided at a position close to the connecting portion. It is considered that the gas that flowed in the facing flow path flowed to the outer peripheral portion of the airbag, the expansion of the flow path directed downward from the connection portion was delayed, and the expansion of the airbag downward was delayed. As a result, there is a possibility that the left and right central portions of the airbag cannot be quickly inflated and deployed downward toward the left and right central portions of the rear glass where the rear glass is likely to be damaged early due to a collision from the rear.

Further, since the airbag apparatus of Patent Document 1 is configured so that the entire airbag is inflated and deployed, a large amount of gas is required to inflate the airbag and a large capacity of the inflator is ensured. There was a need. As a result, it is necessary to employ an inflator having a large capacity, which causes a problem that the manufacturing cost increases, and there is a problem that arrangement of the inflator is limited.
An object of the present invention is to realize an airbag apparatus that can rapidly inflate and deploy the left and right central portions of an airbag downward, and that can efficiently inflate and deploy the airbag at a low cost.

[I]
(Constitution)
A first feature of the present invention is an airbag apparatus including an airbag that is accommodated in an upper portion of a vehicle in a folded state and that is inflated and deployed between a rear seat and a rear glass by supplying inflation gas due to a collision. The configuration is as follows.
A gas supply port that is positioned at the left and right center of the upper portion of the airbag and supplies an inflation gas to the airbag, and a longitudinal flow path that extends downward from the gas supply port in an expanded state. And in a state of being inflated and deployed, it is positioned between a plurality of horizontal flow channels that are arranged vertically from the vertical flow channel and branched to the left and right sides and closed at the tip, and the horizontal flow channel adjacent vertically. A non-expanding portion that does not expand.

(Function)
According to the first feature of the present invention, when the inflation gas from the inflator is supplied to the gas supply port located in the left and right central portion of the upper portion of the airbag due to the collision, the vertical direction extending downward from the gas supply port The expansion gas is supplied to the flow path, and the vertical flow path expands from above to below. Slightly delayed in the expansion of the vertical flow path, the expansion gas from the vertical flow path is divided into a plurality of horizontal flow paths that are lined up and down from the vertical flow path and branched to the left and right sides and closed at the tip. Is supplied, the lateral flow path is inflated, and the entire airbag is inflated and deployed. As a result, the right and left central part of the airbag can be quickly inflated downward, and the airbag is quickly inflated at the right and left central part of the rear glass where the rear glass damaged by the collision from the rear is easily scattered early. Can be deployed.

  According to the first feature of the present invention, the non-inflatable non-inflatable portion positioned between the lateral flow paths adjacent in the vertical direction reduces the volume of the inflatable portion as compared with a configuration in which air is supplied to the entire airbag, for example. The amount of inflation gas required to inflate the bag can be reduced. As a result, the airbag can be efficiently inflated and deployed by the inflator having a relatively small capacity.

(The invention's effect)
According to the 1st characteristic of this invention, scattering of the rear glass etc. which were damaged to the back seat side can be prevented, and the function of scattering prevention can be improved.

  According to the first feature of the present invention, the manufacturing cost of the inflator can be reduced, the manufacturing cost of the airbag device can be reduced, and restrictions on the arrangement of the inflator can be reduced.

[II]
(Constitution)
The second feature of the present invention resides in the following configuration of the airbag apparatus according to the first feature of the present invention.
Comprising a bypass channel that communicates a plurality of the lateral channels arranged in the vertical direction, the bypass channel is disposed behind the right and left seating positions of the rear seat,
A cross-sectional area in a direction perpendicular to the direction of movement of the expansion gas in the bypass channel is set to be narrower than a cross-sectional area in a direction orthogonal to the direction of movement of the expansion gas in the longitudinal channel.

(Function)
According to the second feature of the present invention, the “action” described in the preceding item [I] is provided in the same manner as the first feature of the present invention, and in addition to this, the following “action” is provided.
According to the second feature of the present invention, the occupant seated in the right or left seating position in the rear seat can be protected by the bypass channel disposed behind the right and left seating positions of the rear seat. . In addition, by setting the cross-sectional area of the bypass flow path to be narrower than the cross-sectional area of the vertical flow path, the amount of expansion gas flowing into the bypass flow path can be set small, and a large amount of expansion gas can be added to the bypass flow path. It is possible to prevent the gas from flowing in and slowing down the development of the airbag in the vertical direction.

(The invention's effect)
According to the second feature of the present invention, the “effect of the invention” described in the preceding item [I] is provided in the same manner as the first feature of the present invention. In addition, the following “effect of the invention” is provided. ing.
According to the second aspect of the present invention, an occupant seated in the right or left seating position in the rear seat can be protected by the inflated bypass passage without hindering the rapid vertical deployment of the airbag. .

[Overall configuration of vehicle and overall configuration of airbag device]
The overall configuration of a hatchback type vehicle equipped with the airbag device 15 and the overall configuration of the airbag device 15 will be described with reference to FIGS. 1 and 2 show a left side view of the rear portion of the vehicle and an overall rear view of the vehicle, respectively. FIGS. 3 and 4 show a state in which the airbag device 15 is not activated and a state in which the airbag device 15 is activated. The vertical sectional side view of the vehicle upper part in is shown, respectively.

  As shown in FIGS. 1 and 2, the vehicle has a rear seat 2 (corresponding to the rearmost seat) disposed in the vehicle interior located immediately above the rear wheel 1, and the upper and both sides of the vehicle interior are roofed. 3 and the side panel 4. A rear door 5 is supported at the rear end of the roof 3 so as to be swingable up and down around an axis in the left-right direction. The rear door 5 covers the rear surface side of the vehicle. A rear glass 6 is mounted on the upper part of the rear door 5, and when an air bag device 15 described later is operated, the air bag 20 is placed between the rear seat 2 and the rear glass 6 on the inner surface side of the rear glass 6. The inner surface side of the rear glass 6 is covered with the airbag 20 over substantially the entire area.

  A rear bumper 7 is attached to the lower end of the rear part of the vehicle. When a predetermined impact or more is applied from the rear of the vehicle based on the detection result from the sensor 8 mounted on the rear bumper 7, a control device (FIG. An operation signal is output from the inflator 16 to the inflator 16 so that the inflation gas is supplied from the inflator 16 to the inside of the airbag 15.

  As shown in FIGS. 3 and 4, the roof 3 includes a roof panel 9 that is an exterior material, a roof head lining 10 that is an interior material, and an inner panel 11. The roof head lining 10 is formed of a resin material having flexibility, and is configured to cover substantially the entire area on the inner surface side of the roof panel 9. The inner panel 11 is disposed between the roof panel 9 and the roof head lining 10, is fixed to the roof panel 9, and is formed in a hollow shape together with the roof panel 9.

  The rear door 5 includes a door frame 12 formed in a hollow frame shape and the rear glass 6 described above, and an upper end portion of the door frame 12 swings on and off the roof panel 9 via a hinge 18. It is supported freely. A seal member 13 is attached to a connecting portion between the roof panel 9 and the inner panel 11, and a rear end portion of the roof head lining 10 is engaged with a hook 14 fixed to the seal member 13. When 15 is actuated, the rear end portion of the roof head lining 10 is disengaged from the hook 14 so that the rear portion of the roof head lining 10 can move downward.

  As shown in FIGS. 3 and 4, the airbag device 15 includes an inflator 16 that generates an inflation gas supplied to the airbag 20, and an airbag 20 connected to the inflator 16. . The inflator 16 is fixed to a bracket 17 having an L-shaped cross-section extending from the lower surface side at the center of the left and right in the front portion of the inner panel 11. A pipe-like gas ejection nozzle (not shown) extends downward from the side of the inflator 16, and the gas ejection nozzle of the inflator 16 is connected to the gas supply port 22 a of the connection portion 22 of the airbag 20. Yes.

  As shown in FIG. 3, the airbag 20 is folded into a small space in a state where the airbag device 15 is not in operation, and is located in a space located between the inner panel 11 and the roof head lining 10 at the lower part of the inflator 16. It is arranged.

  As shown in FIG. 4, when the airbag apparatus 15 is actuated by applying an impact of a predetermined level or more from the rear of the vehicle, the inflation gas is supplied from the inflator 16 to the airbag 20 and the airbag 20 is inflated. The roof head lining 10 is pushed downward by the expansion of 20, and advances backward while widening the gap between the inner panel 9 and the roof head lining 10, and expands and deploys downward from the upper part of the rear glass 6. .

[Detailed structure of airbag]
Based on FIG.5 and FIG.6, the detailed structure of the airbag 20 is demonstrated. FIG. 5 shows a developed view of the airbag 20 in an unexpanded state, and FIG. 6 shows a schematic rear view showing the positional relationship between the airbag 20 and the rear glass 6. In FIG. 5, the stitching position of the front fabric 20a and the back fabric 20b constituting the airbag 20 is indicated by a solid line, the non-inflatable non-inflatable portion B is hatched, and the gas flows from the inflator 16 in the inflatable portion A. Are displayed with arrows. Moreover, in FIG. 6, the stitching | suture position of the front side cloth body 20a and the back side cloth body 20b which comprises the airbag 20 is shown with a dotted line.

  As shown in FIG. 5, the airbag 20 is configured by stitching the front-side cloth body 20 a and the back-side cloth body 20 b (see FIG. 4), and includes a main body portion 21, a connection portion 22, a fixing portion 23, and the like. And the parts other than the connection part 22 are configured in a bilaterally symmetric shape. On the upper side of the front side cloth body 20a and the back side cloth body 20b, a connection part 22 connected to the inflator 16 and a fixing part 23 fixed to the bracket 17 are formed, and the front side cloth body 20a and the back side cloth body 20b. The entire outer shape of the airbag 20 is configured by sewing the peripheral edge portion of the connection portion 22 other than the connection port 22a.

  The shape of the airbag 20 is a horizontally long rectangular shape that matches the shape and position of the rear glass 6, the position of the rear seat 2, and the like, and the left and right central portions are shaped to protrude slightly downward. .

  The connecting portion 22 of the airbag 20 is formed at the left and right intermediate position of the upper end portion of the airbag 20, is formed in an L shape, and opens to the right end at the tip portion formed in the L shape. A gas supply port 22a is formed. The inflation gas from the inflator 16 can be supplied to the airbag 20 by inserting and connecting the gas ejection nozzle of the inflator 16 to the gas supply port 22a.

  The fixing portions 23 of the airbag 20 are formed at equal intervals on the left and right of the upper end portion of the airbag 20, and mounting holes 23a are formed in each of the four fixing portions, that is, two on the left and right sides. 23 a is connected to a bracket 17 fixed to the inner panel 11.

  The main body portion 21 is formed with an inflating portion A that is supplied with an expansion gas from the inflator 16 and expands, and a non-expanding portion B that is not supplied with the expansion gas from the inflator 16 and does not expand. A and the non-inflatable part B are formed in the main body part 21 of the airbag 20 by stitching the front-side cloth body 20a and the back-side cloth body 20b.

  The expansion part A of the main body 21 includes a main flow path 24 (corresponding to a vertical flow path) extending downward from the connection part 22 and first to fourth extending from the main flow path 24 to the left and right. It is comprised by subchannel 25-28 (equivalent to a horizontal direction channel).

  The main flow path 24 is formed in the left and right center portion of the main body portion 21 of the airbag 20 and communicates straight downward from the connecting portion 22 located at the upper end portion to the lower end portion of the airbag 20. It is comprised so that it may block | close at the lower end part of 20 and may stop.

  Symmetrically shaped first to fourth sub-channels 25 to 28 are extended from the main channel 24 to the left and right, and the tip portions of the first to third sub-channels 25 to 27 are obliquely outwardly downward. It is molded into a smoothly bent shape. Thus, the strength at the both side portions of the airbag 20 can be improved by forming the tip portions of the first to third sub-channels 25 to 27 into a shape that is smoothly bent obliquely outward and downward. .

  Specifically, for example, a force that causes the airbag 20 to be bent in a square shape when viewed from the side (for example, the scattering of the rear glass 6 due to a collision or the contact of the occupant's head or the like with the airbag 20) acts. In this case, the tip portions of the first to third sub-channels 25 to 27 formed into a bent shape are supported, and the tip portions of the first to third sub-channels 25 to 27 are formed linearly. Compared to the case, the strength of both side portions of the airbag 20 can be improved. In addition, the front-end | tip part of the 1st-3rd subchannel 25-27 may be shape | molded in the shape bent to the diagonally outward side, and may be shape | molded in the curved shape.

  The shapes of the tips of the first to fourth sub-channels 25 to 28 are formed into a round and curved shape, and the expansion gas supplied from the main channel 24 is blocked by the curved and shaped tips and stops. It is configured as follows. The vertical width of the second and third sub-channels 26 and 27 (the cross-sectional area of the second and third sub-channels 26 and 27) is the vertical width of the first and fourth sub-channels 25 and 28. (The cross-sectional area of the first and fourth sub-channels 25, 28) is set wider than that, a large amount of expansion gas is supplied from the main channel 24 to the second and third sub-channels 26, 27, It is comprised so that the expansion part A can be ensured widely in the part which covers the rear glass 6 in the upper-lower center part of the airbag 20 (refer FIG. 6).

  The vertical width of the first to fourth sub-channels 25 to 28 (cross-sectional area of the first to fourth sub-channels 25 to 28) is the width in the left-right direction of the main channel 24 (cross-sectional area of the main channel 24). It is set to be narrower, and is configured so that the amount of the expansion gas flowing into the first to fourth sub-channels 25 to 28 does not become excessive.

  The area of the inflatable portion A and the area of the non-inflatable portion B are such that the proportion of the inflatable portion A increases at the left and right central portions of the airbag 20 and the proportion of the inflatable portion A decreases at both sides of the airbag 20. The shapes of the main channel 24 and the first to fourth sub-channels 25 to 28 are set (the area ratio of the expansion part A and the non-expansion part B is about 1.5: 1 to 3: 1. ). In this way, by configuring the inflating part A and the non-inflating part B, the left and right central parts of the rear glass 6 that are likely to begin to break early due to a collision or the like while keeping the capacity of the inflator 16 low. In the vicinity, scattering of the damaged rear glass 6 toward the rear seat 2 can be effectively prevented.

  By configuring the airbag 20 as described above, when the inflation gas from the inflator 16 is supplied to the connecting portion 22 at the upper portion of the airbag 20, the main flow path 24 is moved upward as shown by the arrow in FIG. The airbag 20 expands downward from the left and right, and the left and right central portions of the airbag 20 expand downward. Then, after the expansion gas is supplied to the main flow path 24, the expansion gas is supplied from the main flow path 24 to the left and right first to fourth sub-flow paths 25 to 28, and the left and right first gas flows. The fourth sub-channels 25 to 28 are inflated from the center to both sides, and both sides of the airbag 20 are developed rightward and leftward.

  As shown in FIG. 6, in the state in which the airbag 20 is inflated and deployed, the substantially entire area of the rear glass 6 can be covered from the vehicle interior by the airbag 20, and the main flow path 24 of the airbag 20 that is inflated and deployed earliest. The air bag 20 is configured so that the position of is located at the left and right intermediate portion of the rear glass 6. In addition, when a passenger | crew gets in the center part of the rear seat 2, it is comprised so that a passenger | crew's head can be protected by the main flow path 24 located in the right-and-left center part of the airbag 20. FIG.

  In this way, by configuring the airbag 20 so that the position of the main flow path 24 of the airbag 20 is positioned at the left and right intermediate portion of the rear glass 6, an impact is applied to the vehicle due to a collision or the like, and the rear glass 6 The airbag 20 can be quickly inflated and deployed at the left and right intermediate positions of the rear glass 6 where there is a high possibility of starting to break, and it is effective that the rear glass 6 broken by a collision or the like is scattered toward the rear seat 2 side. Can be prevented.

[First Alternative Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], the example in which the airbag 20 is configured without forming the bypass flow path 29 has been shown. However, as shown in FIG. The airbag 20 in which a bypass channel 29 is formed between the second sub channel 26 and between the second sub channel 26 and the third sub channel 27 may be employed.

  As shown in FIG. 7, bypass flow passages 29 communicating with the first sub flow passage 25 and the second sub flow passage 26 in the vertical direction are formed on the left and right sides, respectively. Bypass channels 29 that communicate with the three sub-channels 27 in the vertical direction are formed on the left and right sides, respectively. The width in the left-right direction of the bypass channel 29 (cross-sectional area of the bypass channel 29) is the width in the vertical direction of the second and third sub-channels 26, 27 (the section of the second and third sub-channels 26, 27). The area is set to be narrower, and the amount of the expansion gas passing through the bypass passage 29 is not excessively increased.

  Part of the expansion gas supplied to the first and second sub-channels 25 and 26 flows from the bypass channel 29 into the second and third sub-channels 26 and 27, respectively, and the first to third sub-streams It is possible to prevent the paths 25 to 27 from expanding and developing in a biased manner. With the airbag 20 inflated and deployed, the left and right bypass flow paths 29 of the airbag 20 are positioned immediately after the heads H of the occupants who have boarded the left and right seating positions L and R of the rear seat 2. The position of the bypass channel 29 in the left-right direction is set. Thus, by setting the position of the bypass channel 29 in the left-right direction, the occupant's head H can be protected by the expanded bypass channel 29.

[Second Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] and [First Alternative Embodiment of the Invention], the example in which the main flow path 24 is provided at one place in the left and right central portion of the airbag 20 is shown. As shown in FIG. 8, a connecting portion 22 is provided at the left and right central portion of the upper portion of the airbag 20, and left and right branch flow passages 30, 30 branched from the connection portion 22 are provided. The air bag 20 communicates with the left and right main flow paths 24, 24 provided on both left and right side portions of the airbag 20, and is connected to the left and right main flow paths 24, 24 from one connection portion 22 via the left and right branch flow paths 30, 30. You may comprise so that the gas for expansion may be supplied.

  As shown by the arrows in FIG. 8, a part of the expansion gas supplied from the connecting portion 22 to the left and right main flow paths 24 and 24 through the left and right branch flow paths 30 and 30 is left and right. The right and left central portions of the airbag 20 are rapidly inflated downward while the left and right main channels 24 and 24 are rapidly inflated and deployed downward from the both sides. Can be deployed.

[Third Another Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention] and [Second Alternative Embodiment of the Invention], the shape of the airbag 20 is different from that of the connecting portion 22. Although the example in which the airbag 20 is configured so that the portion is configured in a symmetrical shape and the left and right intermediate position of the main flow path 24 is positioned at the intermediate position in the left and right of the rear glass 6 has been shown, 20 (not shown), a main channel 24 (not shown) having a non-symmetrical shape, and first to fourth sub-channels 25 to 28 having a non-symmetrical shape as shown in FIG. Good. Moreover, although not shown in figure, if the position of the connection part 22 and the main flow path 24 with respect to the airbag 20 (or rear glass 6) is located in the left-right center part of the airbag 20 (or rear glass 6), it is. It may be arranged at a position slightly decentered to the right or left.

  In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention] and [Second Alternative Embodiment of the Invention], the connecting portion 22 of the airbag 20 is formed in an L shape. An example is shown in which the gas supply port 22a that is formed and opens toward the right is formed in the airbag 20. However, as shown in FIG. 9, the connecting portion 22 of the airbag 20 is formed in a straight line and is directed upward. The gas supply port 22a opened may be employed, or although not shown, the gas supply port 22a opened toward the left or obliquely upward may be employed.

  In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention] and [Second Alternative Embodiment of the Invention], the left and right first to fourth sub-channels 25- Although the example which employ | adopted the airbag 20 which set the position of the up-down direction of 28 to the same position was shown, as shown in FIG. 9, the position of the up-down direction of the left-right 1st-4th subchannels 25-28 is shown. The airbags 20 set at different positions may be adopted, and the number of left and right sub-channels may be set to different numbers (in the example of FIG. 9, the left side is the first to fourth sub-channels 25-25. 28, three on the right side are first to third flow paths 25 to 27). Although not shown, the number of bypass channels 29 may also be set differently. For example, two bypass channels 29 between the first sub channel 25 and the second sub channel 26 are provided on each of the left and right sides. A configuration may be adopted.

[Fourth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment], [Second Alternative Embodiment] and [Third Alternative Embodiment], air Although the example which formed the shape of the back | bag 20 in the horizontally long rectangular shape was shown, the shape of the airbag 20 may be formed in a different shape, for example, the shape of the airbag 20 may be formed in a vertically long rectangular shape. .

  In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment], [Second Alternative Embodiment] and [Third Alternative Embodiment], air In the state where the back 20 is inflated and deployed, the example in which the airbag 20 is configured so that substantially the entire area of the rear glass 6 can be covered from the vehicle interior by the airbag 20 is shown. The airbag (not shown) may be configured so that the rear glass 6 can be covered from the vehicle interior in a state where the airbag (not shown) is inflated and deployed by the bag (not shown).

  Specifically, the rear glass 6 includes, for example, a rectangular right airbag (not shown) that covers the right side of the rear glass 6 and a rectangular left airbag (not shown) that covers the left side of the rear glass 6. And a main flow path 24 communicating downward from a gas supply port 22a located at the left and right center of the upper part of each of the right and left airbags. A plurality of sub-channels branching right and left from the main channel 24 are provided, the main channel 24 of the right airbag is positioned at the right seating position R, and the main channel 24 of the left airbag is the left side You may comprise so that it may be located in the seating position L. FIG.

  By configuring the right and left airbags in this way, for example, the occupant actually gets on the basis of detection results detected by a seating position detection sensor (not shown) that detects the seating positions L and R of the occupant. The right or left airbag can be inflated and deployed. As a result, by expanding and deploying the right or left airbag with a small capacity, the right or left airbag is inflated more quickly than when the airbag 20 covering substantially the entire area of the rear glass 6 is inflated and deployed. The rear glass 6 can be prevented from being scattered, and the rear glass 6 can be prevented from being scattered to the rear seat 2 side where the passenger is seated.

[Fifth Embodiment of the Invention]
[Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], [Third Alternative Embodiment of the Invention] and [Invention of the Invention] In the fourth embodiment, the main flow path 24, the first to fourth sub-flow paths 25 to 28, and the like are formed in the airbag 20 by stitching the front cloth 20a and the back cloth 20b. Although an example is shown, the front side cloth body 20a and the back side cloth body 20b may be joined by different methods, for example, by bonding or welding the front side cloth body 20a and the back side cloth body 20b located in the non-expanded portion B, The main flow path 24, the first to fourth sub-flow paths 25 to 28, and the like may be formed in the airbag 20.

  [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], [Third Alternative Embodiment of the Invention] and [Invention of the Invention] In the fourth embodiment, the example in which the connecting portion 22 of the airbag 20 is directly connected to the gas ejection nozzle of the inflator 16 is shown. For example, the piping tube is connected to the inflator 16 disposed at a position away from the airbag 20. For example, the connecting portion 22 of the airbag 20 may be connected via an unillustrated (not shown).

  [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], [Third Alternative Embodiment of the Invention] and [Invention of the Invention] In the fourth embodiment, the example in which the hatchback type vehicle is equipped with the airbag device has been shown. However, the present invention can be similarly applied to a sedan type vehicle, and can be applied to both a passenger car and a commercial vehicle. .

Left side view of the rear of the vehicle Overall rear view of the vehicle Vertical side view of the upper part of the vehicle when the airbag device is not operating Vertical side view of the upper part of the vehicle with the airbag device activated Developed airbag in the uninflated state Schematic rear view showing the positional relationship between the airbag and the rear door FIG. 3 is a development view of an airbag according to a first embodiment of the invention. Exploded view of the airbag in the second alternative embodiment of the invention Exploded view of the airbag in the third alternative embodiment of the invention

Explanation of symbols

2 Rear seat (last seat)
6 Rear glass 15 Air bag device 20 Air bag 22a Gas supply port 24 Main flow path (vertical flow path)
25 1st sub flow path (transverse flow path)
26 Second sub-channel (lateral channel)
27 Third sub-channel (lateral channel)
28 4th sub-channel (lateral channel)
29 Bypass flow path B Non-expanded part L Seating position R Seating position

Claims (2)

In an airbag apparatus including an airbag that is accommodated in an upper part of a vehicle in a folded state and inflates and expands between a rear seat and a rear glass by supplying an inflation gas due to a collision,
A gas supply port that is positioned at the left and right center of the upper portion of the airbag and supplies an inflation gas to the airbag, and a longitudinal flow path that extends downward from the gas supply port in an expanded state. And in a state of being inflated and deployed, it is positioned between a plurality of horizontal flow channels that are arranged vertically from the vertical flow channel and branched to the left and right sides and closed at the tip, and the horizontal flow channel adjacent vertically. An airbag device comprising a non-inflatable portion that does not inflate. Comprising a bypass channel that communicates a plurality of the lateral channels arranged in the vertical direction, the bypass channel is disposed behind the right and left seating positions of the rear seat,
The cross-sectional area in the direction orthogonal to the moving direction of the expansion gas in the bypass flow path is set to be narrower than the cross-sectional area in the direction orthogonal to the moving direction of the expansion gas in the vertical flow path. Airbag device.

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