JP2007045172A - Head protection air bag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head protection air bag device capable of preventing excessive increase of an internal pressure even when an air bag developed and expanded interferes with a seat of a window side mobile type. <P>SOLUTION: This head protection air bag device is mounted to a vehicle comprising a plurality of seat along a forward and backward direction, and a seat S3 arranged being close to a lower edge on a compartment side of a window at the time of completion of the movement. A gas inflow part 20 of the air bag 19 is provided with a plurality of expansion shielding parts 25, 26 and 29. The mobile seat side expansion shielding part 29 arranged on the side of the seat S3 at the time of completion of expansion of the air bag 19 comprises a flow inlet 30 at the position near the top end at the time of completion of expansion, and a flow outlet 32 capable of flowing gas for expansion flown from the flow inlet 30 out of an area of the mobile seat side expansion shielding part 29 when the mobile seat side expansion shielding part 29 interferes with the seat S3 moved toward the window at the position immediately below the flow inlet 30. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a head protection airbag device mounted on a vehicle including a plurality of seats arranged along the front-rear direction.

Conventionally, as a head protection airbag device of the above type, there is one mounted on a three-row seat type vehicle, which is folded and stored on the upper edge side of the window inside the vehicle and inflated from the inflator. The air bag is configured to be inflated so as to flow in the working gas and cover the inside of the window. In the conventional head protection airbag device, the airbag flows in the inflation gas so as to cover the vehicle interiors of the three windows arranged on the sides of the first to third row seats, respectively. It was the structure provided with three expansion | swelling shielding parts which are made to expand | swell (for example, refer patent document 1).
JP 2004-175225 A (pages 5 to 7, FIG. 1)

  Usually, in a three-row seat type vehicle, there are many cases where an occupant does not sit in the third row seat, and in that case, the third row seat may be stored and used as a storage space for luggage or the like. However, in the case of using an airbag having three inflating shields as in the conventional head protection airbag device, the seat is moved and stowed so as to be close to the lower edge side of the window inside the vehicle. In a type of vehicle, when the airbag is deployed and inflated with the seats in the third row stored, a portion of the inflated shielding portion of the airbag that is deployed and inflated may interfere with the stored seat. And when the seat of the stored 3rd row and the part of the expansion shielding part interfere, since the substantial volume has become small, the internal pressure of the part of this expansion shielding part may rise unnecessarily. There was room for improvement in this regard.

  The present invention solves the above-described problems, and provides a head protection airbag device that can prevent an excessive increase in internal pressure even when an airbag that is deployed and inflated interferes with a window-side movement type seat. The purpose is to do.

The head protection airbag device according to the present invention is folded and housed on the upper edge side of a plurality of windows inside the vehicle, and inflated from an inflator and protrudes downward from the housing position. The airbag is configured to be deployed and inflated so as to cover the vehicle interior of the window.
Corresponding to each window, there are provided a plurality of seats arranged along the front-rear direction, and at least one of the seats other than the front seat is brought close to the lower edge side of the inside of the window when the movement is completed. Mounted on a vehicle configured to be a window-side moving type seat,
The airbag is configured to include a gas inflow portion that inflates by inflating the inflation gas from the inflator, and a non-inflow portion that does not allow the inflation gas to flow,
A head protection airbag device having a configuration in which the gas inflow portion includes a plurality of expansion shielding portions arranged along the front-rear direction so as to cover the vehicle interior side of each window on the side of the seat when inflation of the airbag is completed. Because
An inflow port through which inflation gas from the inflator flows in is located at a position where the movable seat side expansion shielding portion disposed on the side of the window side movement type seat when the airbag is completely inflated is near the upper end when the inflation is completed. When the movable seat side expansion shield part interferes with the seat moved to the window side at a position almost directly below the inlet part, the inflation gas flowing in from the inlet part into the movable seat side expansion shield part An outflow path portion that suppresses the inflow of the mobile seat and allows it to flow out of the region of the movable seat side expansion shielding portion is provided.

  In the head protection airbag device of the present invention, when the airbag is deployed and inflated in a state in which the seat is moved so as to be close to the lower edge side of the vehicle inside the window disposed on the side, Even if the moving seat side expansion shielding part interferes with the seat moved so as to be close to the lower edge side of the vehicle inside of the window, the expansion gas flowing in from the inlet part is almost directly below the inlet part. It is possible to flow out of the area of the movable seat side expansion shielding portion from the outflow path portion disposed in the. Therefore, it is possible to suppress an unnecessary increase in the internal pressure in the vicinity of the inlet of the movable seat side expansion shielding portion. For example, the base fabric constituting the movable seat side expansion shielding portion is damaged, and the movable seat It is possible to prevent gas leakage from the vicinity of the inlet of the side expansion shield.

  Therefore, in the head protection airbag device of the present invention, even if the airbag that is deployed and inflated interferes with the window-side moving type seat, an excessive increase in internal pressure can be prevented.

  Note that “substantially directly below the inlet portion” refers to an arrangement position relationship in the vertical direction, and it is only necessary that the outflow path portion is disposed immediately below the inlet portion in a projected state in the front-rear direction. The inflow side opening for allowing the inflation gas to flow in the outflow path part is disposed below the inflow part and shifted in the front-rear direction, and the inflow side opening of the outflow path part includes Even if it is arranged below the inflow portion and shifted in the front-rear direction, the outflow path portion is arranged almost directly under the inflow portion.

  Further, in the head protection airbag device having the above-described configuration, if the outflow path portion is configured to communicate with another expansion shielding portion adjacent to the movable seat side expansion shielding portion, the outflow passage portion flows out of the movable seat side expansion shielding portion. The expanded gas can be allowed to flow into another expansion shielding part, and this expansion shielding part can be rapidly expanded, which is preferable.

  Conversely, in the head protection airbag device having the above-described configuration, the outflow path portion is disposed outside the area of the moving-side inflating shield part and within the non-inflow area, and communicates only with the outflow path portion. If the auxiliary inflow portion is configured to communicate with the auxiliary inflow portion, the inflating gas flowing out from the movable seat side expansion shielding portion can be prevented from flowing into the other expansion shielding portion. It can suppress that the internal pressure of a site | part raises more rapidly than necessary.

  Further, in the head protection airbag device having the above configuration, the auxiliary inflow portion is surrounded by a non-inflow portion between the movable seat side expansion shielding portion and the expansion shielding portion adjacent to the movable seat side expansion shielding portion. If it is configured to be disposed in the part, the gas inflow part of the gas inflow part that is inflated by inflowing the inflation gas into the part of the non-inflow part between the movable seat side expansion shield part and the adjacent expansion shield part. This is preferable because the area is disposed, and the protection area capable of protecting the occupant by securing the cushion effect can be substantially enlarged.

  Furthermore, in the head protection airbag device having the above-described configuration, when the internal pressure near the inflow port of the movable seat side expansion shielding part is greater than or equal to a predetermined value when the airbag is deployed and inflated, It is preferable to have a configuration in which the expansion gas that is about to flow into the movable seat side expansion shield is opened so as to be able to flow out.

  If the head protection airbag device has the above-described configuration, when the airbag is deployed without moving the seat, the inflation gas does not flow out into the outflow passage portion. Can be allowed to flow into the movable seat side expansion shield part, and the movable seat side expansion shield part can be quickly deployed to cover the inside of the window. It is preferable.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a head protection airbag apparatus M according to an embodiment of the present invention is applied to a three-row seat type vehicle V including seats S1, S2, and S3 arranged in three rows along the front-rear direction. It is mounted on the windows (side windows) W1, W2, W3 of the vehicle V and the front pillar portion FP and the roof side rail portion RR on the upper edge side of the rear pillar portion RP. In the vehicle V, the seat S3 in the third row is a window-side moving type seat, and when this seat S3 is not in use, as shown by a two-dot chain line in FIG. It is the structure stored upright so that it may adjoin to.

  The airbag device M includes an airbag 19, an inflator 9, mounting brackets 10 and 14, and an airbag cover 17.

  As shown in FIG. 1, the airbag cover 17 is configured from the lower edge side of each of the pillar garnish 3 disposed in the front pillar portion FP and the roof head lining 4 disposed in the roof side rail portion RR. Has been. The airbag cover 17 is disposed so as to cover the inside of the airbag 19 that is folded and stored, and in order to allow the airbag 19 during deployment to protrude toward the inside of the vehicle. It is configured to be openable to the inside of the vehicle by being pushed by 19.

  The inflator 9 supplies inflation gas to the airbag 19 and has a substantially cylindrical shape. A gas discharge port (not shown) capable of discharging the inflation gas is disposed on the front end (front end) side. It is a configuration. The inflator 9 inserts the vicinity of the tip including the vicinity of the gas discharge port into a gas inlet 23 to be described later of the airbag 19, and uses the clamp 12 that is externally installed near the rear end of the gas inlet 23, It is connected to the airbag 19. Further, the inflator 9 uses a mounting bracket 10 for holding the inflator 9 and a mounting bolt 11 for fixing the mounting bracket 10 to the inner panel 2 on the body 1 side, above the window W3 in the inner panel 2. It is attached to the position.

  The airbag 19 is folded and stored from the lower edge side of the front pillar portion FP, which is the upper edge side of the windows W1, W2, and W3 on the inner side of the vehicle, to the lower edge side of the roof side rail portion RR. The expansion gas is allowed to flow in, is unfolded from the folded state, and protrudes downward from the storage position P, while the insides of the windows W1, W2, and W3 and the first and second intermediate pillar portions P1 and P2 inside It is the structure which expand | deploys so that it may cover. In the case of the embodiment, the airbag 19 is manufactured by bag weaving using polyamide yarn or the like. The gas inflow part 20 expand | swells by making it flow in, and is comprised from the non-inflow part 35 which does not flow in the gas G for expansion.

  In the embodiment, the gas inflow portion 20 includes a gas supply path portion 22, a gas inflow port portion 23, and first, second, and third expansion shielding portions 25, 26, and 29.

  As shown in FIG. 2, the gas supply path portion 22 is disposed on the upper edge 19 a side of the airbag 19 over substantially the entire front and rear of the airbag 19 so as to be substantially along the longitudinal direction of the vehicle V. The expansion gas G discharged from the inflator 9 is configured to guide the first, second, and third expansion shielding portions 25, 26, and 29 disposed below the gas supply path portion 22. A gas inlet 23 connected to the inflator 9 is communicated with the gas supply path 22 at a position shifted from the center in the front-rear direction in the gas supply path 22 to the rear side. It is arrange | positioned so that it may protrude. In the case of the embodiment, the gas inlet 23 is opened on the rear end 23a side. The gas inflow port 23 is connected to the inflator 9 using the clamp 12.

  The first inflating shielding part 25 is a part that covers the vehicle inner side of the window W <b> 1 arranged on the side of the seat S <b> 1 in the first row when the airbag 19 is completely inflated. The second inflating shielding part 26 is a part that covers the vehicle inner side of the window W2 disposed on the side of the seat S2 in the second row when the airbag 19 is completely inflated. The third inflating shielding part 29 is a part that covers the vehicle inner side of the window W3 disposed on the side of the seat S3 in the third row when the inflation of the airbag 19 is completed. That is, in the case of the embodiment, the third expansion shielding portion 29 is a movable seat side expansion shielding portion disposed on the side of the window side movement type seat S3.

  Each of the first and second expansion shielding portions 25 and 26 is partitioned within the region by a thickness restricting portion 37 and a partitioning portion 40, which will be described later, and each of a plurality of vertical portions disposed along the vertical direction. The inflating part 27 is arranged side by side in the front-rear direction. In the case of the embodiment, the first expansion shielding part 25 is composed of four vertical expansion parts 27A, 27B, 27C, and 27D, and the second expansion shielding part 26 is composed of two vertical expansion parts 27E and 27F. . In the first expansion shielding part 25, the vertical expansion parts 27A and 27B are configured such that the upper end side is communicated with the gas supply path part 22 and the lower end side is closed. The vertical expansion portion 27C is communicated with the gas supply passage portion 22 at the upper end side, and is communicated with the vertical expansion portion 27D disposed adjacent to the rear side at the lower end side. The vertical expansion portion 27D is configured such that the upper end side is closed and the expansion gas G flows from only the lower end side communicating with the vertical expansion portion 27C. In the second expansion shielding part 25, the vertical expansion part 27E is communicated with the gas supply path part 22 at the upper end side, and communicated with the vertical expansion part 27F arranged adjacent to the rear side at the lower end side. The vertical expansion portion 27F communicates with the vertical expansion portion 27E at the lower end side, and is closed at the upper end side, which is the gas supply path portion 22 side, by a horizontal bar portion 40a of the partition portion 40 to be described later. It is configured to communicate with an outflow passage portion 32 extending from the portion 29.

  The third inflating shielding part 29 is configured to allow the inflating gas to flow into the inside from the inflow part 30 disposed at the rear end side of the upper end side when the inflation of the airbag 19 is completed. The portion on the upper end side excluding the portion 30 is partitioned by the horizontal bar portion 40a of the partition portion 40, and the gas supply path portion 22 side is closed. The inflow port portion 30 is arranged with the axial direction of the opening in the vertical direction so that the expansion gas G flows into the third expansion shield portion 29 downward, and in the front-rear direction substantially above the outflow passage portion 32 described later. It is formed on the far side. In the case of the embodiment, since the outflow passage portion 32 is disposed on the front end side of the third expansion shielding portion 29 as described later, the inflow port portion 30 is connected to the inflow side opening 32a of the outflow passage portion 32. It is disposed at a site on the rear end side of the third expansion shielding part 29 that is separated in the front-rear direction. The third expansion shielding part 29 is defined by a plurality of lateral expansion parts 31 which are partitioned in the region by the thickness regulation part 38 and are respectively arranged along the front-rear direction. ing. In the case of the embodiment, the third expansion shielding part 29 is composed of three lateral expansion parts 31. And the lateral expansion part 31A arrange | positioned just under the inflow port part 30 is connected with the upper end side of the vertical expansion part 27F of the 2nd expansion shielding part 26 so that it may extend in the front side. When the communication portion 32 interferes with the seat S3 stored so that the third expansion shielding portion 29 moves toward the window W3 when the airbag 19 is deployed and inflated, the inflating gas flowing from the inlet portion 30 The outflow that allows G1 to flow out into the second expansion shield part 29 outside the region of the third expansion shield part 29 while suppressing the inflow into the third expansion shield part 29 (inside the other lateral expansion part 31). The road part 32 will be comprised. In addition, in the case of the embodiment, the inflation gas G flowing in from the inlet port 30 flows downward into the third expansion shielding portion 29 and flows at least to a region below the outflow passage portion 32 in the case of the embodiment. A vertical flow path 29a that flows linearly is formed up to the lower edge 19b.

  The outflow path portion 32 is disposed substantially along the front-rear direction, the rear end side (third expansion shielding portion 29 side) is an inflow side opening 32a, and the front end side (second expansion shielding portion 26 side) is An outflow side opening 32b is provided. In the case of the embodiment, the outflow passage portion 32 has the inflow side opening 32a above the upper end of the stored seat S3 when the inflation of the airbag 19 is completed, and the third and third seats S3 and S3 are stored. Even if the expansion shielding part 29 interferes, it is formed so as to be disposed at a position that is not blocked by the seat S3 (see the two-dot chain line in FIG. 2).

  The non-inflow portion 35 is configured by combining the vehicle inner wall portion 20a and the vehicle outer wall portion 20b. In the case of the embodiment, the non-inflow portion 35 includes a peripheral portion 36 that divides the peripheral edge of the gas inflow portion 20, and A plurality of thickness restricting portions 37 and 38 disposed so as to restrict the thickness of the second and third expansion shielding portions 25, 26 and 29 when expansion is completed and expand in a plate shape, and a gas supply path portion 22 and the partition 40 disposed so as to partition the upper ends of the second and third expansion shields 26 and 29, and the first, second and third expansion shields 25, 26 and 29. It is comprised from the plate-shaped part 41 * 42 provided and the attaching part 43 provided in the upper edge 19a side of the airbag 19. As shown in FIG.

  The thickness restricting portion 37 has a linear shape substantially along the vertical direction within the region of the first expansion shielding portion 25, and is disposed at three locations along the front-rear direction. The thickness restricting portions 37A and 37B disposed at two locations on the front side are disposed so as to extend upward from the lower edge side of the peripheral edge portion 36 so as to partition the longitudinal expansion portions 27A, 27B, and 27C, respectively. ing. The thickness restricting portion 37C disposed on the rear side is closed from the upper edge side of the plate-like portion 41 toward the front so as to block the upper end side of the vertically expanding portion 27D and partition the vertically expanding portions 27C and 27D. And is bent so that the tip side faces downward. In the region of the third expansion shielding part 29, the thickness restricting part 38 is formed in a linear shape substantially along the front-rear direction, and is disposed at two locations along the vertical direction.

  The partition portion 40 has a substantially inverted L shape, and a portion of the second expansion shield portion 26 extending from the upper portion of the vertical expansion portion 27F to the vicinity of the rear end portion of the third expansion shield portion 29 is connected to the communication passage portion 32. A horizontal bar portion 40a that is linearly arranged along the front-rear direction so as to be separated from the gas supply path portion 22 and a portion extending upward from the front end of the horizontal bar portion 40a. It is comprised from the vertical bar part 40b arrange | positioned linearly along a substantially up-down direction. The vertical bar portion 40b is a part that partitions the vertical expansion portions 27E and 27F in the second expansion shielding portion 26. And the inflow port part 30 of the 3rd expansion | swelling shielding part 29 will be arrange | positioned at the back side of the horizontal bar part 40a.

  The plate-like portion 41 is disposed below the gas supply passage portion 22 and between the first and second expansion shielding portions 25 and 26, and the plate-like portion 42 is connected to the outflow passage portion 32. It is arranged in a lower part and between the second and third expansion shielding portions 26 and 29. Each of these plate-like portions 41 and 42 is disposed in order to secure the overall shape of the airbag 19 and to reduce the capacity of the gas inflow portion 20 so as to shorten the time until completion of inflation. Further, the portion of the plate-like portion 42 that is near the center in the front-rear direction is broken when the third inflation shielding portion 29 interferes with the seat S3 in which the airbag 19 is deployed and inflated. A planned fracture portion 42 a that allows separation of the lower edge side portion between the expansion shielding portion 26 and the third expansion shielding portion 29 is provided. The planned fracture portion 42a is configured by disposing a large number of slits intermittently and linearly in the perforated portion 42 in the plate-like portion 42, and in the case of the embodiment, it is arranged so as to be substantially along the vertical direction. It is installed.

  A plurality of attachment portions 43 are arranged so as to protrude upward from a portion on the upper edge side of the peripheral edge portion 36 on the upper edge 19a side of the airbag 19. In the case of the embodiment, the attachment portions 43 are arranged at six locations including a portion on the distal end side of the connecting cloth 45 described later. A mounting bracket 14 made of sheet metal for mounting the airbag 19 to the inner panel 2 is fixed to each mounting portion 43. And the attaching part 43 is being fixed to the inner panel 2 by the side of the body 1 with the attachment bracket 14 using the attachment bolt 15. FIG.

  The non-inflow portion 35 includes a connecting cloth 45 that is disposed on the front end side of the airbag 19. The connecting cloth 45 is composed of a woven cloth using polyamide yarn or the like, and is joined by stitching to the vicinity of the front edge of the first inflating shielding portion 25 of the airbag 10. When the inflation of the airbag 19 is completed, It will be arranged near the lower part of the front pillar part FP. Note that an attachment portion 43 is also formed at the tip side of the connecting cloth 45.

  Next, the mounting of the airbag apparatus M of the embodiment on the vehicle V will be described. First, the airbag 19 to which the connecting cloth 45 has been sewn in advance is folded. Specifically, it is folded by bellows folding with a number of folds C (see FIG. 2) along the front-rear direction so that the lower edge 19b side approaches the upper edge 19a side, and can be broken when the folding is completed. A predetermined portion is wrapped with a wrapping material for preventing collapse. Next, the attachment bracket 14 is attached to each attachment portion 43, and the inflator 9 is connected to the gas inlet portion 23 while using the clamp 12. And the attachment bracket 10 is attached to the circumference | surroundings of the inflator 9, and the airbag assembly | attachment body is formed.

  Thereafter, the mounting brackets 10 and 14 are arranged at predetermined positions on the inner panel 2 and fastened with bolts 11 and 15, lead wires (not shown) extending from a predetermined control device for inflator operation are connected to the inflator 9, and the pillar garnish 3 If the roof head lining 4 is attached to the body 1 and the pillar garnishes 5, 6, 7 are attached to the body 1, the airbag device M can be mounted on the vehicle V.

  If the inflator 9 is operated after the airbag device M is mounted on the vehicle V, the inflation gas G from the inflator 9 flows into the airbag 19 as shown in FIG. The wrapping material not to be broken is broken, and further, the airbag cover 17 constituted by the lower edges of the pillar garnish 3 and the roof head lining 4 is pushed open and protrudes downward, and the two-dot chain line in FIG. 1 and FIGS. As shown, the windows W1, W2, and W3, the first and second intermediate pillar portions P1 and P2, and the rear pillar portion RP are greatly expanded so as to cover the vehicle interior side.

  In the head protection airbag device M of the embodiment, the airbag 19 is deployed and inflated in a state where the seat S3 is stored so as to be close to the lower edge side of the vehicle interior side of the window W3 arranged on the side. When this happens, the third expansion shielding part 29 as the movable seat side expansion shielding part interferes with the seat S3 stored so as to be close to the lower edge side of the vehicle W3 inside the vehicle as shown in FIG. Even if this happens, the inflation gas G1 flowing in from the inflow port portion 30 passes through the lateral expansion portion 31A disposed almost immediately below the inflow port portion 30 as shown in FIG. It is possible to flow into the outflow passage portion 32 from the inflow side opening 32 a that is not blocked, and to flow out from the outflow side opening 32 b into the second expansion shielding portion 26 that is outside the region of the third expansion shielding portion 29. For this reason, it is possible to suppress an unnecessary increase in the internal pressure in the vicinity of the inlet portion 30 of the third expansion shielding portion 29. For example, the base fabric constituting the third expansion shielding portion 29 is damaged, It is possible to prevent gas leakage from the vicinity of the inlet portion 30 of the three expansion shielding portion 29.

  Therefore, in the head protection airbag device M of the embodiment, even if the airbag 19 that is deployed and inflated interferes with the window-side movement type seat S3, an excessive increase in internal pressure can be prevented.

  In the airbag apparatus M of the embodiment, the outflow path portion 32 is communicated with the second expansion shielding portion 26 adjacent to the third expansion shielding portion 29, so that the third expansion shielding portion 29 is stored. When interfering with the seat S3, the inflation gas G1 that has flowed out from the third expansion shielding portion 29 via the outflow passage portion 32 can flow into the second expansion shielding portion 26, and the second expansion shielding portion The portion 26 can be rapidly expanded.

  Furthermore, in the airbag device M of the embodiment, the planned fracture portion 42a is disposed on the plate-shaped portion 42 disposed between the second expansion shielding portion 26 and the third expansion shielding portion 29. When the airbag 19 is deployed and inflated, when the third inflating shielding part 29 interferes with the stored seat S3, as shown in FIG. 5, the planned breaking part 42a is broken, and the second inflating shielding part 26 and the second inflating shielding part 26 The part on the lower edge side between the three expansion shielding portions 29 is separated. Therefore, even if the third expansion shielding part 29 interferes with the stored seat S3, the first and second expansion shielding parts 25 and 26 are arranged in a row without disturbing the expansion of the second expansion shielding part 26. It can be smoothly deployed and inflated so as to cover the inside of the windows W1 and W2 arranged on the sides of the seats S1 and S2 in the second row. Of course, if such a point is not taken into consideration, it is not necessary to provide the planned fracture portion at the plate-like portion 42. In addition, a slit that separates the lower edge side between the second expansion shielding portion 26 and the third expansion shielding portion 29 may be disposed in advance in the portion of the plate-like portion 42 instead of the planned fracture portion. .

  Of course, in the airbag apparatus M according to the embodiment, when the occupant is seated in the third row of seats S3, the deployed third inflating shield 29 does not interfere with the seat S3. Therefore, as shown in FIGS. Expansion will be completed so that the 3rd expansion shielding part 29 may inflate the gas G for expansion from the inflow port part 30, and may cover the vehicle inside of the window W3 arrange | positioned at the side of seat S3. In this case, the airbag 19 is completely inflated without breaking the planned break portion 42a. And in the 3rd expansion shielding part 29 of embodiment, the gas G for inflow which flows in from the inflow port part 30 reduces the amount which flows into the outflow path part 32 side, flows down the vertical flow path 29a, and air Since it reaches the bag lower edge 19b side, the third expansion shielding part 29 can be rapidly expanded and inflated. Furthermore, in the case of the embodiment, the inflow port portion 30 is arranged on the rear end side of the third expansion shielding portion 29, and the inflow side opening 32 a of the inflow passage portion 32 is on the front end side of the third expansion shielding portion 29. The inflow port portion 30 and the inflow side opening 32a of the inflow passage portion 32 are disposed at the upper end side of the third expansion shielding portion 29 so as to be separated from the front and rear ends. The expansion gas G is easy to flow to the outflow path portion 32 side after the third expansion shielding portion 29 is expanded and expanded.

  In the airbag apparatus M of the embodiment, when the airbag 19 is deployed and inflated with the seat S3 retracted, the inflation gas G1 flowing into the third inflation shielding part 29 flows through the outflow path part 32. After that, the second expansion shield part 26 flows into the second expansion shield part 26, but the second expansion shield part 26 is communicated with the first expansion shield part 25 by the gas supply path part 22 and flows out from the outflow path part 32. The expanded gas G1 flows from the second expansion shield part 26 into the first expansion shield part 25 through the gas supply path part 22. That is, in the airbag apparatus M of the embodiment, the first and second expansion shielding parts having a volume much larger than the volume of the third expansion shielding part 29 for the inflation gas G1 flowing out from the outflow path part 32. 25 and 26 and the gas supply passage 22 are configured to flow into the seat S3 in which the third expansion shielding portion 29 to be deployed is stored, and the expansion gas G1 flows from the outflow passage 32 to the second. When flowing into the second expansion shield part 26, it is possible to prevent the base fabric constituting the second expansion shield part 26 from being damaged and causing gas leakage from the site of the second expansion shield part 26.

  Furthermore, the airbag 47 may be configured as shown in FIG. The airbag 47 has the same configuration as the airbag 19 described above except for the outflow path portion 48 disposed in the third inflating shielding portion 29A and the auxiliary inflow portion 50 communicated with the outflow path portion 48. The same reference numerals are assigned to the members and the description thereof is omitted.

  The outflow passage portion 48 disposed in the third inflating shielding portion 29A of the airbag 47 is a lateral inflating portion 31A disposed directly below the inflow port portion 30 in the same manner as the outflow passage portion 32 in the airbag 19 described above. Is extended to the front, and communicates with an auxiliary inflow portion 50 that communicates only with the outflow passage portion 48. The outflow path portion 48 is disposed substantially along the front-rear direction in the same manner as the outflow path portion 32 in the airbag 19 described above, and the rear end side (the third expansion shielding portion 29A side) is connected to the inflow side opening 48a. The front end side (the second expansion shielding part 26 side) is the outflow side opening 48b. In the case of the embodiment, the outflow passage portion 48 has the inflow side opening 48a above the upper end of the stored seat S3 when the inflation of the airbag 19 is completed, and the third and third seats S3 and S3. Even if the expansion shielding part 29A interferes, it is formed so as to be disposed at a position that is not blocked by the seat S3 (see the two-dot chain line in FIG. 6).

  The auxiliary inflow portion 50 is outside the region of the third expansion shielding portion 29A and in the region of the plate-like portion 42A (non-inflow portion 35) between the second expansion shielding portion 26 and the third expansion shielding portion 29A. At a position that is a substantially intermediate portion in the front-rear direction, the upper end side is disposed substantially along the vertical direction so as to communicate with the outflow side opening 48 b of the outflow path portion 48. In addition, the outflow passage 48 is closed on the inflow side opening 48a side by a closing portion 49 that is linearly disposed along the vertical direction. The closing portion 49 is formed by weaving the warp or weft constituting one wall when the airbag 47 is formed by bag weaving into the warp or weft constituting the other wall. The warp or weft constituting the connecting portion is broken only when the internal pressure of the third expansion shielding portion 29A exceeds a predetermined value so as to be able to communicate with the third expansion shielding portion 29A. ,It is configured.

  That is, when the airbag 47 is deployed and inflated with the seat S3 retracted, the closing portion 49 interferes with the seat S3 in which the third inflating shielding portion 29A to be deployed is stored and covers the inside of the window W3. Thus, when the expansion cannot be completed and the internal pressure of the third expansion shielding part 29A becomes a predetermined value or more, the warp or weft constituting the connecting part is broken and communicated with the inflow side opening 48a of the outflow path part 48, The inflation gas flows into the auxiliary inflow portion 50 from the outflow opening 48b via the outflow passage portion 48. Specifically, the closing part 49 is configured to break the warp or weft constituting the connecting part when the internal pressure of the third expansion shielding part 29A becomes 60 kPa or more.

  Also in the airbag 47 of the embodiment, the planned fracture portion 42a is disposed substantially along the vertical direction at a portion of the plate-like portion 42A between the auxiliary inflation portion 50 and the third inflation shielding portion 29A. Yes.

  In the airbag 47 having the above-described configuration, when the occupant is seated in the third row of seats S3, the deployed third inflating shielding portion 29A does not interfere with the seat S3. Therefore, as shown in FIG. The airbag 47 completes inflating in a state where the portion on the inflow side opening 48 a side is closed by the closing portion 49. That is, in the airbag 47 having the above-described configuration, the inflation gas G that has flowed in from the inflow port portion 30 does not flow out into the outflow passage portion 48 when the occupant is seated in the seat S3 in the third row. Can be made to flow into the third expansion shielding part 29A while suppressing the outflow to the outflow path part 48 side, and the third expansion shielding part 29A can be rapidly deployed so as to cover the vehicle interior side of the window W3. be able to.

  When the airbag 47 is deployed and inflated with the seat S3 in the third row stored, the third inflating shielding portion 29A to be deployed is stored so as to be close to the lower edge side on the vehicle interior side of the window W3. When interfering with the seat S3, a large amount of inflation gas flows into the third inflating shielding portion 29A that interferes with the seat S3 and is prevented from expanding and having a smaller volume than when the inflation is completed. When the internal pressure of the expansion shielding part 29A exceeds a predetermined value, the closing part 49 closing the outflow path part 48 is broken, and the lateral expansion part 31A of the third expansion shielding part 29A becomes the inflow side opening 48a of the outflow path part 48. Will be communicated with. As shown in FIG. 8, the expansion gas G2 flowing in from the inflow port portion 30 is blocked by the stored seat S3 via a lateral expansion portion 31A disposed substantially immediately below the inflow port portion 30. It is possible to flow into the outflow passage portion 48 from the inflow side opening 48a that is not present, and to flow out from the outflow side opening 48b into the auxiliary inflow portion 50 disposed outside the region of the third expansion shielding portion 29A. Therefore, it is possible to suppress an unnecessary increase in the internal pressure in the vicinity of the inflow port portion 30 of the third expansion shielding portion 29A. For example, the base fabric constituting the third expansion shielding portion 29A is damaged, and It is possible to prevent gas leakage from the vicinity of the inlet portion 30 of the three expansion shielding portion 29A.

  Further, even in the airbag 47 having the above-described configuration, when the third inflating shielding portion 29A interferes with the seat S3 in which the third inflating shielding portion 29A is deployed, the airbag 47 is disposed between the auxiliary inflow portion 50 and the third inflating shielding portion 29A. The planned fracture portion 42a is broken, and the lower edge portion between the auxiliary inflow portion 50 and the third expansion shielding portion 29A is separated. Therefore, even if the third expansion shielding portion 29A interferes with the stored seat S3, the first and second expansion shielding portions 26 disposed in front of the auxiliary inflow portion 50 are not hindered. The two expansion shielding portions 25 and 26 can be smoothly deployed and inflated so as to cover the vehicle interior side of the windows W1 and W2 disposed on the sides of the first and second seats S1 and S2.

  Furthermore, in the airbag 47 having the above-described configuration, the outflow passage portion 48 is communicated with the auxiliary inflow portion 50 that is communicated only with the outflow passage portion 48, so that the inflation gas that has flowed out of the third inflating shielding portion 29A. G2 can be prevented from flowing into the second expansion shielding part 26, and the internal pressure of the second expansion shielding part 26 can be prevented from rising more rapidly than necessary. And in the airbag 48 of the said structure, the auxiliary | assistant inflow part 50 is surrounded by the plate-shaped part 42A between the 3rd expansion | swelling shielding part 29A and the 2nd expansion | swelling shielding part 26 adjacent to the 3rd expansion | swelling shielding part 19A. Therefore, the portion of the plate-like portion 42A is provided with the portion of the gas inflow portion that expands by inflating the inflating gas into the portion, thereby ensuring the cushion effect. Thus, it is possible to substantially expand the protection area that can protect the passenger.

  In the embodiment, as the airbags 19 and 47, those formed from bag weaving are used. However, as the airbags, those of a suture bag type formed by stitching a woven fabric of a predetermined shape are used. May be used. When the airbag is a suture bag, in the airbag, when the portion between the outflow passage portion and the third inflating shielding portion (moving seat side inflating shielding portion) is closed, an adhesive that bonds the base fabrics together. It is good also as a structure which obstruct | occludes using a suture thread.

  In the embodiment, the third expansion shielding portion (moving seat side expansion shielding portion) 29 </ b> A side of the outflow passage portion 48 in the airbag 47 configured to communicate the outflow passage portion 48 with the auxiliary inflating portion 50 is connected to the closing portion 49. Of course, as in the case of the airbag 19, the third expansion shielding portion side in the outflow passage portion is also obstructed even in the airbag configured to communicate the outflow passage portion 32 to the adjacent second expansion shielding portion 26. It is good also as a structure which arrange | positions the obstruction | occlusion part to be made. In the airbag having such a configuration, when the airbag is deployed and inflated in a state where the seats in the third row are not retracted, the inflation once flows into one of the inflating shielding portions (second and third inflating shielding portions). It is preferable that the discharged gas is prevented from flowing out to the other expansion shielding portion (second and third expansion shielding portions), and each expansion shielding portion can be rapidly expanded.

  Furthermore, as the airbag 52, the one shown in FIG. 9 may be used. The airbag 52 is configured such that the second row of seats S2 and the third row of seats S3 can be used in a three-row seat type vehicle in which both are seats of the window side movement type. Both of the expansion shielding part 54 and the third expansion shielding part 58 are configured to be movable seat side expansion shielding parts, and a part of the plate-like part 42B between the second and third expansion shielding parts 54 and 58. In addition, one auxiliary inflow portion 50A communicating with the outflow passage portions 56 and 62 provided in the second and third expansion shielding portions 54 and 58 is provided. The airbag 52 has the same configuration as that of the above-described airbag 19 except for the second inflation shielding portion 54 and the third inflation shielding portion 58, and the same members are denoted by the same reference numerals for explanation. Omitted.

  The second inflating shielding part 54 is configured by arranging three lateral inflating parts 31 side by side in the same manner as the third inflating shielding part 29 in the airbag 19 described above, and is arranged on the upper end side. The lateral inflating portion 31A is configured such that the rear end side is communicated with the inflow side opening 56a of the outflow passage portion 56 disposed on the rear side. The inflow port portion 55 that allows the inflation gas to flow into the second expansion shield portion 54 has the axial direction of the opening in the vertical direction so that the expansion gas G flows downward into the second expansion shield portion 54. In addition to being disposed, it is disposed at a position on the upper end side on the front end side of the second expansion shielding portion 54, which is on the side away in the front-rear direction immediately above the outflow passage portion 56. The outflow path portion 56 is arranged linearly along the vertical direction on the front end side (the inflow side opening 56a side) that becomes the second expansion shielding portion 54 side, like the outflow path portion 48 in the airbag 46 described above. The closed portion 49A is closed.

  The third expansion shielding part 58 is partitioned in the region by a substantially T-shaped thickness regulating part 63, and a lateral expansion part 60 disposed along the front-rear direction on the upper end side, and a lateral expansion part It is comprised from the two vertical expansion parts 61 * 61 juxtaposed in the front-back in the lower part side of 60. FIG. Each vertical expansion part 61 is configured such that the upper end side communicates with the horizontal expansion part 60 and the lower end side communicates with each other. The lateral expansion portion 60 is configured such that the front end side communicates with the inflow side opening 62a of the outflow passage portion 62 disposed on the front side, and allows the expansion gas to flow into the third expansion shielding portion 58. The inflow port portion 59 is arranged with the axial direction of the opening in the vertical direction so as to allow the expansion gas G to flow downward into the third expansion shielding portion 58, and separated in the front-rear direction immediately above the outflow passage portion 62. It is disposed at the position on the upper end side on the rear end side of the third expansion shielding portion 58 which is the side. The outflow path portion 62 is linearly arranged along the vertical direction on the rear end side (the inflow side opening 62a side) which is the third expansion shielding portion 54 side, like the outflow path portion 48 in the airbag 46 described above. It is closed by the provided closing portion 49A.

  Further, in the second and third expansion shielding portions 55 and 58, the inflation gas G flowing from the inflow port portions 55 and 59 is received in the same manner as the third expansion shielding portions 29 and 29A in the airbags 19 and 47 described above. The longitudinal flow paths 55a and 58a that flow downward and flow linearly to the lower edge of the airbag 52 that is a region below the outflow path portions 56 and 62 are formed.

  The auxiliary inflow portion 50A disposed at the portion of the plate-like portion 42B between the second and third expansion shielding portions 54 and 58 has an upper end side on each outflow path, like the auxiliary inflow portion 50 in the airbag 46 described above. It arrange | positions along the substantially up-down direction so that it may connect with the outflow side opening 56b * 62b of the part 56 * 62. In the airbag 52 of the embodiment, the outflow passage portions 56 and 62 are configured in a straight line along the front-rear direction, and the outflow passage portions 56 and 62 and the auxiliary inflow portion 50A form a substantially T shape. It is arranged. The second and third expansion shielding portions 54 and 58 are separated from the gas supply passage portion 22 by the partition portion 64 disposed along the front-rear direction above the outflow passage portions 56 and 62 and the lateral expansion portions 31A and 60. It is the composition divided.

  In the airbag 52 having such a configuration, when the occupant is seated in the second and third row seats S2 and S3, the deployed second and third inflated shielding portions 54 and 58 interfere with the seats S2 and S3. Therefore, the airbag 52 is completely inflated in a state where the portions on the inflow side openings 56a and 62a in the outflow passage portions 56 and 62 are closed by the closing portion 49A. The airbag 52 is deployed in a state where the second and third seats S2 and S3 are stored, and the seats S2 and S3 in which the second and third inflating shielding portions 54 and 58 to be deployed are stored. A large amount of inflation gas flows into the second and third expansion shields 54 and 58 which interfere with each other and interfere with the seats S2 and S3 and are prevented from expanding and have a smaller volume than when expansion is completed. 2. When the internal pressure of the third expansion shielding portions 54 and 58 becomes a predetermined value or more, the closing portion 49A closing the outflow passage portions 56 and 62 is broken, and the expansion gas flowing in from the inlet portions 55 and 59 is broken. However, it flows out into the auxiliary inflow portion 50A through the outflow passage portions 56 and 62. Of course, when the airbag 52 is deployed and inflated in a state where either one of the seats S2 and S3 is stored, only the closed portion disposed on the side of the inflating shield that interferes with the seat is broken, and the other The expansion shielding portion can suppress the expansion gas flowing in from the inflow port portion from flowing out to the outflow passage portion side and can flow into the inside.

  In addition, in embodiment, although demonstrated taking the case of what was mounted in the three-row seat type vehicle V, the vehicle which can mount the head protection airbag apparatus of this invention is not restricted to this, For example, The second row of seats may be applied to a two-row seat type vehicle that can rotate and move so that the backrest side is close to the window.

  In the embodiment, the airbag 19 is folded and stored by bellows folding, but the folded shape of the airbag is not limited to this. For example, the airbag 19 is rolled so that the lower edge side approaches the upper edge side. And you can fold it. In the embodiment, the mounting portion 43 of the airbag 19 is fixed to the inner panel 2 on the body 1 side using the mounting bracket 14 and the mounting bolt 15 made of sheet metal. The fixing of 43 to the inner panel 2 is not limited to this. For example, the attachment portion 43 may be fixed to the inner panel 2 using a clip or the like.

It is the schematic front view which looked at the head protection airbag apparatus which is one Embodiment of this invention from the vehicle inside. It is a front view which shows the state which unfolded flat the airbag used with the head protection airbag apparatus of embodiment. In the head protection airbag device of an embodiment, it is the outline front view seen from the car inside which shows the state where the airbag completed inflation. FIG. 4 is a schematic cross-sectional view showing a state where the airbag has been inflated in the head protection airbag device of the embodiment, and is a view showing the IV-IV part of FIG. 3. In the head protection airbag device according to the embodiment, it is a partially enlarged front view seen from the vehicle inner side showing a state in which the airbag is completely inflated with the third row of seats retracted. It is a front view which shows the airbag which is other embodiment of this invention. FIG. 8 is a schematic front view of the head protection airbag device using the airbag of FIG. 7 as seen from the vehicle inner side showing a state in which the airbag has been completely inflated. FIG. 8 is a partially enlarged front view of the head protection airbag device using the airbag of FIG. 7 as seen from the inside of the vehicle showing a state in which the airbag is completely inflated with the third row of seats retracted. It is a front view which shows the airbag which is another form of this invention.

Explanation of symbols

1 ... Body
9 ... Inflator,
19.47 ... Airbag,
20: Gas inflow part,
25 ... 1st expansion shielding part,
26 ... the second expansion shielding part,
29, 29A, the third expansion shielding part (movable seat side expansion shielding part),
30 ... Inlet part,
32.48 ... Outflow passage,
35 ... non-inflow part,
42 ... a plate-shaped part,
49. Blocking part,
50 ... auxiliary inflow part,
52 ... Airbag,
54 ... 2nd expansion shielding part (moving seat side expansion shielding part),
58 ... third expansion shield (movable seat side expansion shield),
55.59 ... Inlet part,
56, 62 ... Outflow passage,
S1, S2, S3 ... Seat,
W1, W2, W3 ... windows,
V ... Vehicle,
M: Head protection airbag device.

Claims (5)

Folded and stored on the upper edge side of a plurality of windows on the inner side of the vehicle, the expansion gas from the inflator flows in and expands and expands so as to cover the inner side of each window while protruding downward from the storage position. An air bag having a configuration,
Corresponding to each of the windows, a plurality of seats are provided along the front-rear direction, and at least one of the seats other than the front seat is brought close to the lower edge side of the inside of the window when the movement is completed. It is mounted on a vehicle configured to be a window-side moving type seat arranged so that
The airbag includes a gas inflow portion that inflates by inflating an inflation gas from the inflator, and a non-inflow portion that does not allow the inflation gas to flow,
The head protection having a configuration in which the gas inflow portion includes a plurality of inflatable shielding portions arranged along the front-rear direction so as to cover the vehicle interior side of each window on the side of the seat when the inflation of the airbag is completed. An airbag device,
The inflow port through which the inflating gas from the inflator flows into a position where the movable seat side expansion shielding part disposed on the side of the window side movement type seat when the airbag is completely inflated is near the upper end when the inflation is completed When the movable seat side expansion shield part interferes with the seat moved to the window side at a position substantially below the inflow part, the inflation gas flowing in from the inflow part is A head protection airbag device comprising an outflow path portion that suppresses inflow into the movable seat side expansion shielding portion and allows outflow outside the region of the movable seat side expansion shielding portion.   2. The head protection airbag device according to claim 1, wherein the outflow passage portion is communicated with another expansion shielding portion adjacent to the movable seat side expansion shielding portion.   The outflow path is disposed outside the area of the moving side expansion shielding part and in the non-inflow area, and is communicated with an auxiliary inflow section that communicates only with the outflow path. The head protecting airbag device according to claim 1, wherein the head protecting airbag device is provided.   The auxiliary inflow portion is disposed in a portion surrounded by the non-inflow portion between the movable seat side expansion shielding portion and the expansion shielding portion adjacent to the movable seat side expansion shielding portion. The head protection airbag device according to claim 3.   The outflow passage portion will flow into the movable seat side expansion shielding portion only when an internal pressure in the vicinity of the inflow port portion of the movable seat side expansion shielding portion becomes a predetermined value or more during deployment of the airbag. The head protection airbag device according to any one of claims 1 to 4, wherein the head protection airbag device is closed so as to open so as to allow the inflation gas to flow out.

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