JP2014166798A - Air bag device for head protection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag device for head protection that can prevent an occupant from moving to outside of a vehicle to appropriately constrain the occupant inside the vehicle when the vehicle is rolling over, without moving the lower edge thereof to below a belt line at the time when inflation is completed.SOLUTION: An air bag 19 comprises: an inflation shielding portion 20 for covering a vehicle indoor side I of window glass W2; and an overlapping inflation portion 25 arranged at the vehicle indoor side I of the inflation shielding portion 20. The inflation shielding portion 20 has a rodlike portion 31 composing a main inflation portion 21 and a sub-inflation portion 23 for completing inflation after completion of inflation by the main inflation portion 21 parallely disposed in a vertical direction. The overlapping inflation portion 25 is configured to complete inflation after completion of inflation of the sub-inflation shielding portion 23 and to cover the vehicle indoor side I over approximately the whole area in a vertical direction of a site across the rodlike portion 31 and the sub-inflation portion 23 on completion of the inflation. On completion of inflation of the air bag 19, an inflated site where the rodlike portion 31 overlaps with the overlapping inflation portion 25 is supported by a body side member 1 in a site of a roof side rail portion RR.

Description

  The present invention is folded and stored on the upper edge side of the window on the vehicle interior side, and the upper edge side is attached and fixed to the body side of the vehicle so that the inflation gas from the inflator flows in and protrudes downward from the storage portion. The present invention relates to a head protection airbag device configured to include an airbag configured to inflate so as to cover the vehicle interior side of the window.

  Conventionally, in the head protection airbag device, the airbag is inflated so as to cover the inside of the window so that the occupant can be restrained and protected on the inside of the vehicle even when the vehicle rolls over after a side collision of the vehicle. The expansion shielding part is configured such that the lower edge side is positioned below the belt line, and the reinforcing expansion part swells in a rod shape along the front-rear direction on the inner side or the outer side of the lower edge side when the expansion of the expansion shielding part is completed. There is a configuration in which is arranged (see, for example, Patent Document 1).

JP 2010-36805 A

  However, in the conventional head protection airbag device, when the inflation is completed, the lower edge side of the expansion shielding portion is positioned below the belt line and supported by the members constituting the belt line, so that the passenger of the rollover Although it is a configuration that ensures head restraint performance, it is necessary to set the vertical dimension so that the lower edge side can be reliably supported by the members constituting the belt line during rollover, and the degree of freedom in design There was room for improvement in terms of increasing.

  The present invention solves the above-described problem, and suppresses movement of the occupant to the outside of the vehicle at the time of rollover of the vehicle even if the lower edge side at the completion of expansion is not positioned below the belt line, thereby An object of the present invention is to provide a head protection airbag device that can be restrained accurately inside the vehicle.

The head protection airbag device according to the present invention is folded and housed on the upper edge side of the window inside the vehicle, and the upper edge side is attached and fixed to the body side member of the vehicle so that the inflation gas from the inflator flows in. A head protection airbag device configured to include an airbag configured to inflate so as to cover the vehicle interior side of the window while projecting downward from the storage portion.
Airbag
An expansion shield arranged to cover the inside of the window when the expansion is completed;
The expansion portion of the expansion shield portion that is inflated by inflowing the inflation gas into the vehicle inner side or the vehicle outer side of the expansion shield portion and the inflation portion are overlapped with each other while communicating with the expansion shield portion. A stacked inflatable portion to be disposed;
And is configured to include
The expansion shielding portion includes a main expansion portion, and a sub expansion portion that communicates with the main expansion portion and completes expansion after completion of expansion of the main expansion portion,
The main inflatable portion is configured to be disposed on the upper edge side of the inflating shielding portion at the time of completion of expansion, and the rod-shaped portion is formed as a substantially rod shape substantially extending in the front-rear direction.
A sub-expansion part;
Are arranged side by side in the vertical direction side,
The overlapped inflating portion communicates with the sub inflating portion and is configured to complete the inflating after the inflating of the sub shielding portion is completed. It is configured to cover the inside or outside of the vehicle over substantially the entire area,
When the airbag is completely inflated, the inflated portion where the rod-like portion and the overlapped inflating portion overlap is supported by the body side member in the portion of the roof side rail portion.

  In the head protection airbag device of the present invention, when the airbag is completely inflated, the overlapped inflating part that completes the inflating after the inflating shielding part is inflated on the inside or the outside of the inflating shielding part is inflated by the inflating shielding part. The overlapping inflating part is arranged in a bar shape substantially in the front-rear direction on the upper edge side, and the lower side of the bar-like part. It is the structure arrange | positioned so that the area | region of the subexpansion part arrange | positioned adjacent to may be covered over the upper and lower substantially whole area. When the airbag is completely inflated, the inflated portion where the rod-like portion and the overlapping inflated portion overlap is supported by the body side member in the portion of the roof side rail portion. The vehicle body side member on the upper edge side can accurately support the outside of the rod-shaped portion or the overlapped expansion portion. In addition, since the sub-expansion part arranged below the rod-like part is also arranged on the vehicle inner side or the vehicle outer side with the overlapping expansion part, the substantial thickness at the completion of the expansion can be increased, At the time of rollover, the head of the occupant moving toward the outside of the vehicle can be accurately protected by the sub-inflation part. Therefore, in the head protection airbag device of the present invention, the lower edge side when the inflation is completed is below the belt line by supporting the region on the upper edge side of the thickly inflated sub-inflation part by the body side member. Even if it is not positioned at the position, the head of the occupant can be restrained accurately at the time of rollover.

  Therefore, in the head protection airbag device of the present invention, even when the lower edge side at the completion of the inflation is not positioned below the belt line, the movement of the occupant to the outside of the vehicle is suppressed during vehicle rollover, and the occupant is It can be restrained accurately inside.

Further, in the head protection airbag device of the present invention, the airbag is configured from an airbag structure that is configured to be adjacent to the overlapping inflated portion on the lower side of the auxiliary inflatable portion in a flatly deployed state.
The overlapping inflatable part is configured to communicate with the sub-inflatable part via the communication part, and both the front and rear edge sides are separated from the airbag component side, and folded at the part of the communication part to fold the inflated shielding part. It is configured to be arranged inside or outside the vehicle,
It is preferable that the airbag has a configuration in which the portions arranged in the front and rear of the void area of the folded and inflated portion are connected by a connecting member in the airbag structure.

  If the head protection airbag device is configured as described above, the expansion of the overlapped inflation portion is difficult because the inflation gas does not easily move between the secondary inflation portion and the overlapped inflation portion by folding back at the communication portion. Can be reliably delayed from the start of expansion of the sub-expansion section, and the folding portion functions as a check valve, so that the expansion gas once flowing into the overlapped expansion section is difficult to move to the sub-expansion section side. Become. Therefore, at the time of rollover, the internal pressure of the overlapping inflatable part can be sufficiently secured, and even if the internal pressure of the expansion shielding part is lowered, the occupant's head can be restrained accurately by the overlapping inflating part. it can. Further, in the head protection airbag device having the above-described configuration, although the overlapped inflating portion is configured by separating the front and rear edge sides from the airbag constituting body side, a gap area generated when the overlapping inflating portion is folded back in the airbag constituting body. The front and rear portions of the airbag are connected to each other by a connecting member. Therefore, in the inflating shielding portion when the airbag is completely inflated, the portion located on the front side of the overlapped inflating portion and the rear side The portion that is positioned can integrally cover the inside of the window of the window while suppressing swinging that causes the lower edges to expand and close each other.

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 of the state where the air bag composition which constitutes the air bag used with the head protection air bag device of an embodiment was developed flat. FIG. 3 is a partially enlarged front view showing a portion of a lap inflation part in the airbag structure of FIG. 2. FIG. 3 is a front view of a state in which an airbag formed by bending an overlapped inflatable portion in the airbag structure of FIG. 2 is flatly deployed. It is a schematic sectional drawing of the state which expanded the airbag of FIG. 4 alone, and respond | corresponds to the VV site | part of FIG. In the head protection airbag device of an embodiment, it is the outline front view which looked at the state where the airbag completed inflation from the car inside. In the head protection airbag device of an embodiment, it is a schematic longitudinal cross-sectional view along the left-right direction (in-vehicle outside direction) which shows the state where the expansion shielding part of the airbag expanded at the time of side collision. It is a schematic longitudinal cross-sectional view along the left-right direction which shows the state which the overlap | expansion expansion | swelling part expanded after the expansion | swelling of the expansion | swelling shielding part in the head protection airbag apparatus of embodiment. In the head protection airbag device of an embodiment, it is a schematic diagram explaining the process in which an overlap expansion part expands. It is a schematic longitudinal cross-sectional view along the left-right direction which shows the state which mounted the airbag of the state which located the overlap expansion part on the vehicle outer side of the expansion | swelling shielding part in a vehicle, and the overlap expansion part expanded.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the head protection airbag device M of the embodiment is mounted on a two-row seat type vehicle V having two windows (side windows) W1 and W2. The head protection airbag device M according to the embodiment includes an airbag 19, an inflator 13, mounting brackets 10 and 14, and an airbag cover 8. As shown in FIG. 1, the airbag 19 has a rear pillar portion RP that passes from the lower edge side of the front pillar portion FP to the lower edge side of the roof side rail portion RR on the upper edge side of the windows W1 and W2 on the inner side of the vehicle V. Is folded and stored up to the area above.

  As shown in FIG. 1, the airbag cover 8 includes lower edges 4a and 5a of a front pillar garnish 4 disposed in the front pillar portion FP and a roof head lining 5 disposed in the roof side rail portion RR. Is made up of. The front pillar garnish 4 and the roof head lining 5 are made of synthetic resin, and are fixedly attached to the inner side of the inner panel 2 as the body side member 1 in the front pillar portion FP and the roof side rail portion RR, respectively. Yes. The airbag cover 8 is disposed so as to cover the inner side of the airbag 19 that is folded and stored, and in order to allow the airbag 19 when deployed to inflate to the inner side I of the airbag. The bag 19 can be pushed and opened to the inside I (see FIGS. 7 and 8).

  The inflator 13 supplies inflation gas to the airbag 19, and as shown in FIG. 1, as a substantially cylindrical cylinder type, a gas discharge port (not shown) capable of discharging inflation gas is provided on the tip side. It is arranged. The inflator 13 uses the clamp 16 disposed on the outer peripheral side on the rear end 32a side of the connection port 32 by inserting the distal end side including the vicinity of the gas discharge port into a connection port 32 to be described later of the airbag 19. The air bag 19 is connected. Further, the inflator 13 uses a mounting bracket 14 for holding the inflator 13 and a bolt 15 for fixing the mounting bracket 14 to the inner panel 2 as the body side member 1. It is attached at a position to be above. The inflator 13 is electrically connected to a control device (not shown) of the vehicle V via a lead wire (not shown). When the control device detects a side collision or rollover of the vehicle V, the inflator 13 is actuated from the control device. It is configured to operate upon input of a signal.

  Each mounting bracket 10 is composed of two sheet metal plates, and is attached to each mounting portion 44 so as to sandwich each mounting portion 44 described later of the airbag 19 as shown in FIGS. Each mounting portion 44 is fixedly attached to the inner panel 2 by using the mounting bolt 11.

  As shown in FIGS. 1 and 6, the airbag 19 allows the inflation gas from the inflator 13 to flow into the interior and deploys it from the folded state, so that the windows W 1, W 2, the center pillar portion CP, and the rear pillar portion RP It is configured to expand so as to cover the inner sides of the pillar garnishes 6 and 7. As shown in FIG. 4, the airbag 19 includes an expansion shielding part 20 that covers the inside of the windows W <b> 1 and W <b> 2 when the inflation is completed, and an overlapping inflating part 25 that is disposed on the inside of the expansion shielding part 20. Configured. The expansion shield 20 can cover the vehicle interior from the window W1 through the center pillar CP and the window W2 to the front side of the rear pillar RP when the airbag 19 is completely inflated. It is made into the substantially rectangular plate shape substantially along the direction (refer FIG. 6). Further, in the case of the embodiment, as shown in FIGS. 4 and 6, the expansion shielding portion 20 positions the lower edge 20 b at the completion of expansion below the belt line BL formed by the lower edges of the windows W <b> 1 and W <b> 2. The upper and lower width dimensions are set so that

  The expansion shielding unit 20 is in communication with the main expansion unit 21 and expands after the main expansion unit 21 has completed expansion. The main expansion unit 21 (primary expansion unit) expands by inflating the expansion gas discharged from the inflator 13. A front side secondary expansion part 22 and a rear side secondary expansion part 23 (secondary expansion part) to be completed. And the overlap expansion part 25 is set as the structure which expands after the main expansion part 21 (primary expansion part), the front side secondary expansion part 22, and the rear side secondary expansion part 23 (secondary expansion part) as a tertiary expansion part. . In the case of the embodiment, the expansion shielding part 20 includes partition coupling parts 46, 47, 48, 49 and thickness regulating parts 50, 51 that divide the main expansion part 21, the front side secondary expansion part 22, and the rear side secondary expansion part 23. Except for a small area, the expansion gas is allowed to flow into the interior over substantially the entire surface so as to expand.

  In the case of the embodiment, as shown in FIGS. 2 and 3, the airbag 19 is an airbag structure 28 in which the overlapping inflating portion 25 is disposed below the rear side inflating portion 23 in a flatly deployed state. Is formed. Specifically, the airbag inflating body 25 has the overlapping inflating portion 25 except that the connection port portion 32 constituting the main inflating portion 21 in the inflating shielding portion 20 protrudes upward from the approximate center of the front and rear on the upper edge side. The outer shape is made into a substantially rectangular shape, and slits 26 are provided on both the front and rear sides of the overlapping inflating portion 25 so as to be cut from the lower edge side (see FIG. 3). ), Both the front and rear edge sides of the overlapping inflatable portion 25 can be separated from the side of the airbag structure 28 (extra-wall portion 43 described later) over substantially the entire upper and lower regions. The overlapping inflating portion 25 is folded at the downstream communication portion 38 disposed on the upper edge (original portion 25a) side, and the tip 25b (the lower edge side before the turning back) is connected to the upper edge of the expansion shielding portion 20. By connecting (sewing) to the 20a side, a gas inflow portion 29 (expansion portion) of the expansion shielding portion 20 that inflates by inflating the expansion gas is overlapped with each other so as to overlap each other. It is a structure arrange | positioned at I (refer FIG. 5).

  In the case of the embodiment, the airbag structure 28 uses two coated cloths obtained by applying a coating agent for preventing gas leakage on the surface of a woven cloth formed by weaving polyamide yarn, polyester yarn or the like, using sutures. Manufactured by sewing. As shown in FIGS. 2 to 5, the airbag 19 (airbag component 28) includes a vehicle inner wall portion 29 a positioned on the vehicle inner side I and a vehicle outer wall portion 29 b positioned on the vehicle outer side O when the inflation is completed. The gas inflow part 29 expand | swells by making the expansion | swelling gas G from the inflator 13 flow in inside so that it may space apart, and the non-inflow part 41 which does not allow the expansion | swelling gas to flow in is comprised.

  The gas inflow portion 29 includes a gas guide channel 31, a connection port portion 32, a front seat protection portion 33, a rear seat protection portion 34, and a front side secondary expansion portion that constitute the main expansion portion 21 in the expansion shielding portion 20. 22, the rear side sub-expansion portion 23, the overlap expansion portion 25, the upstream side communication portions 36 and 37 that connect the main expansion portion 21 with each of the front side sub-expansion portion 22 and the rear side sub-expansion portion 23, and the rear side And a downstream side communication portion 38 that allows the sub-expansion portion 23 and the overlapping expansion portion 25 to communicate with each other. 4 and 6, the overlapping inflating portion 25 is mounted on the vehicle V in a state of being folded with respect to the inflating shielding portion 20 so as to be positioned on the vehicle inner side I of the inflating shielding portion 20. When the airbag 19 is completely inflated, the wall portion arranged so as to continue from the vehicle interior side wall portion 29a of the inflation shielding portion 20 is arranged so as to be located on the vehicle outer side (see FIG. 5).

  The gas guide channel 31 constitutes a rod-shaped portion, and is disposed on the upper edge 20a side of the expansion shielding portion 20 as a substantially rod shape extending substantially along the front-rear direction over substantially the entire region before and after the region of the main expansion portion 21. It is installed. The gas guide channel 31 guides the inflation gas G discharged from the inflator 13 to the front seat protection unit 33 and the rear seat protection unit 34 disposed below the gas guide channel 31. It is configured. In the case of the embodiment, the connection port portion 32 connected to the inflator 13 is located at a position slightly displaced forward from the front and rear center of the gas guide channel 31 (a position that is substantially the center before and after the expansion shielding portion 20). The gas guide channel 31 communicates with the gas guide channel 31 so as to protrude upward. In the case of the embodiment, the connection port portion 32 is formed so as to be inclined rearwardly with respect to the gas guide channel 31 and opens the rear end 32a side so that the inflator 13 can be inserted. And the connection port part 32 will be connected with the inflator 13 by fitting the clamp 16 in the outer peripheral side in the state which inserted the inflator 13 inside. In the airbag 19 of the embodiment, a separate inner tube 54 for increasing heat resistance is disposed in a portion from the connection port portion 32 directly below the connection port portion 32 in the gas guide channel 31. (See FIGS. 2 and 4).

  The front seat protection section 33 is disposed on the side of the front seat when the inflation is completed, and protects the head of the passenger seated in the front seat when the airbag 19 completes the inflation in a side collision. It is a part to do. As shown in FIGS. 4 and 6, the front seat protection portion 33 includes a portion that extends downward from the belt line BL when expansion is completed. The rear seat protection part 34 is disposed on the side of the rear seat when the inflation is completed, and protects the head of the passenger seated in the rear seat when the airbag 19 completes the inflation in a side collision. It is a part to do. The rear seat protection part 34 is configured to be positioned above the belt line BL when the airbag 19 is completely inflated (see FIGS. 4 and 6). The front seat protection part 33 and the rear seat protection part 34 are configured to complete the expansion in about 20 to 30 ms after the inflator 13 is activated by detecting a side collision of the vehicle V.

  The front side sub-inflating portion 22 is disposed adjacent to the front side of the main inflating portion 21 (front seat protecting portion 33). As shown in FIGS. And the lower end side portion 22a is configured to be positioned below the front seat protection portion 33. The front side sub-inflatable portion 22 is configured to extend the lower end side portion 22 a below the front side portion of the front seat protecting portion 33. In the case of the embodiment, the front side secondary expansion portion 22 is connected to the gas guide flow path 31 of the main expansion portion 21 by the upstream side communication portion 36 that is opened to the rear upper end side. The upstream communication portion 36 is configured to delay the start of inflow of the inflation gas G more than the front seat protection portion 33 by reducing the opening width dimension h1 (opening area, see FIG. 2). . Specifically, the front side sub-expansion part 22 delays the start of the inflow of the inflation gas G from the front seat protection part 33, and within 70 to 80 ms from the start of the operation of the inflator 13 inside. The opening width dimension h1 (opening area) of the upstream communication portion 36 is set so as to flow in to complete the expansion.

  As shown in FIGS. 2 and 3, the rear side sub-inflating portion 23 is a region below the gas guide channel 31 between the front seat protecting portion 33 and the rear seat protecting portion 34 in the main inflating portion 21. Is disposed adjacent to the main inflating portion 21. As shown in FIGS. 4 and 6 to 8, the rear sub-inflation portion 23 is configured to be positioned above the belt line BL when the airbag 19 is completely inflated. In the case of the embodiment, the rear side sub-inflating portion 23 is communicated with the rear seat protecting portion 34 by the upstream side communicating portion 37 that is opened to the rear end side. Similarly to the upstream communication portion 36 disposed on the front side secondary expansion portion 22 side, the upstream side communication portion 37 is also set to have a small opening width dimension h2 (opening area, see FIG. 3), and the rear side secondary expansion portion. 23, delaying the start of inflow of the inflation gas G from the rear seat protection part 34, and causing the inflation gas G to flow into the interior within 70 to 80 ms from the start of the operation of the inflator 13 to complete the inflation. It is configured. In the case of the embodiment, the upstream communication portion 37 is set to have an opening width dimension h2 slightly larger than that of the upstream communication portion 36. This is because the upstream communication portion 37 is the rear seat protection portion 34. This is because it is difficult for the inflation gas to be directly inserted through the upstream communication portion 36 disposed on the front end side and disposed in front of the gas guide channel 31.

  In the inflating shielding part 20 of the embodiment, when the inflation of the airbag 19 is completed, as described above, the front seat protection part 33 and the front side secondary inflating part 22 arranged so as to cover the inside of the window W1 have the lower ends thereof. The rear seat protection part 34 and the rear auxiliary expansion part 23, which are configured to be positioned below the belt line BL and are disposed so as to cover the inside of the window W2, are positioned above the belt line BL. (See FIG. 6). In the embodiment, the airbag component 28 constituting the airbag 19 is formed into a substantially rectangular shape with the flattened outer shape approximately along the longitudinal direction in the front-rear direction. A surplus portion 43 constituting the lower side of a peripheral joint portion 42 to be described later is arranged below the lower portion 34 so as to extend greatly downward, and the inflating shielding portion 20 has a lower edge when the airbag 19 is completely inflated. 20b is configured to be positioned below the belt line BL over substantially the entire front and rear.

  6 and 8, when the airbag 19 is completely inflated, the overlapping inflating portion 25 moves the vehicle inner side I of the portion extending from the gas guide channel 31 as the rod-like portion to the rear side sub-inflating portion 23 in the upper and lower directions. It is configured to cover substantially the entire region, and is arranged below the rear side sub-inflation part 23 so as to continue from the rear side sub-inflation part 23 in a state where the airbag structure 28 is flatly deployed. Yes. As shown in FIG. 3, the overlapping inflatable portion 25 is configured so that the front-rear width dimension H <b> 1 substantially matches the front-rear width dimension H <b> 2 of the rear side sub-inflatable part 23 in a state where the airbag structure 28 is flatly deployed. The upper and lower width dimension H3 is a substantially rectangular shape that is slightly smaller than the separation distance L1 from the upper edge of the gas guide channel 31 to the lower edge of the rear sub-expansion portion 23. Specifically, the overlapped expansion portion 25 has an upper and lower width dimension H3 set to about 3/4 of the separation distance L1 from the upper edge of the gas guide flow path 31 to the lower edge of the rear side auxiliary expansion portion 23. In addition, when the expansion is completed, the entire region of the rear side sub-expansion portion 23 and the region of the lower half of the gas guide channel 31 are covered (see FIG. 8). Further, the overlapped expansion portion 25 is in communication with the rear side sub-expansion portion 23 by a downstream side communication portion 38 formed on the front end side away from the upstream side communication portion 37 on the base portion 25a side. The downstream side communication portion 38 has an opening area so that the start of inflow of the expansion gas G into the overlapped expansion portion 25 is delayed as compared with the rear side secondary expansion portion 23, and the rear side secondary expansion portion 23 is used for the rear seat. It is set to be smaller than the upstream side communication part 37 communicating with the protection part 34. Specifically, the downstream communication portion 38 has an opening width dimension h3 (see FIG. 3) in a state where the airbag structure 28 is flatly deployed, and is 1/3 of the opening width dimension h2 of the upstream communication section 37. Is set to about. Specifically, the opening expansion dimension h3 of the downstream communication section 38 is set so that the overlap expansion section 25 completes expansion in about 1500 ms from the start of the operation of the inflator 13.

  And this overlap expansion part 25 covers the downstream communication part 38 in the site | part of the division coupling part 49 arrange | positioned at the base part 25a side (upper edge side of the state expand | deployed flat) and the downstream communication part 38. With a crease CL (see FIGS. 2 and 3) approximately along the front-rear direction and folded back so as to cover the inside I of the expansion shield 20, the tip 25b side (the lower edge side in a flatly unfolded state) Are configured to be sewn and connected to the upper edge 20a side of the expansion shielding portion 20 using a suture thread. As described above, the overlapped expansion portion 25 has a vertical width H3 that is slightly smaller than the separation distance L1 from the upper edge of the gas guide channel 31 to the lower edge of the rear auxiliary expansion portion 23 (in the embodiment). In this case, about 3/4), a connecting piece portion 53 that extends downward and is connected to the upper edge 20a side of the expansion shielding portion 20 is arranged on the tip 25b side (the lower edge side in a flat state). Therefore, the connecting piece portion 53 is sewn to the upper edge 20a side of the expansion shielding portion 20 in a state of being flattened without reducing the width dimension in the vertical direction. It will be arranged so as to cover. When the airbag 19 is completely inflated, the overlapped inflating portion 25 has an inflated shape, the gas guide passage 31 that is inflated by inflating the inflation gas therein, and the vehicle interior I of the rear side sub-inflating portion 23. Are formed in a substantially rectangular plate shape covering substantially the entire surface (specifically, from the lower edge side of the rear side sub-expansion portion 23 to a position that is substantially at the top and bottom of the gas guide channel 31). It will be arrange | positioned in the area | region which covers the vehicle inner side of the window W2 so that it may overlap with the rear side secondary expansion part 23 and the vehicle inner side I. In the embodiment, the rear side sub-inflation part 23 is configured to be positioned above the belt line BL when the airbag 19 is completely inflated. The overlapping inflating portion 25 arranged in the above is also configured to be positioned above the belt line BL as a whole.

  The non-inflow portion 41 includes a peripheral joint portion 42 that constitutes the outer peripheral edge of the gas inflow portion 29, a surplus portion 43 that is a portion on the outer peripheral side of the peripheral joint portion 42, and a mounting portion that attaches the airbag 19 to the inner panel 2. 44, partition coupling portions 46, 47, 48, 49 and thickness regulating portions 50, 51, 52 disposed in the region of the gas inflow portion 29, and a connecting piece disposed on the tip 25b side of the overlapping expansion portion 25 Part 53. In the case of the embodiment, the peripheral coupling portion 42, the partition coupling portions 46, 47, 48, 49, and the thickness regulating portions 50, 51, 52 are formed using a suture thread in the vehicle inner wall portion 29a and the vehicle outer wall portion. Although it is comprised from the stitching | suture site | part which sews to 29b, the sealing agent which prevents the gas leak from a seam is apply | coated to this stitching | suture site | part over the perimeter although it is not illustrated in detail.

  The peripheral edge coupling portion 42 is disposed so as to surround the periphery of the gas inflow portion 29 over the entire circumference except for the rear end 32 a side of the connection port portion 32. The surplus part 43 is a part disposed on the outer peripheral side of the peripheral joint part 42 over the entire length of the peripheral joint part 42. The attachment portion 44 is a portion for attaching the upper edge 20a side of the expansion shielding portion 20 to the inner panel 2 that is the body side member 1 of the vehicle V, and a plurality of attachment portions 44 (in the case of the embodiment, 5). Are arranged). Each mounting portion 44 is formed with a mounting hole (not shown) through which the mounting bolt 11 can be inserted. In the case of the embodiment, each attachment portion 44 is formed of a woven fabric made of polyamide yarn, polyester yarn or the like that is separate from the airbag component 28, and the original portion side is the upper edge of the surplus portion 43. It arrange | positions so that it may sew on the site | part by the side of 20a and may protrude upwards. The connecting piece portion 53 is a portion for sewing (connecting) the tip 25b side of the overlapping inflating portion 25 to the upper edge 20a side of the inflating shielding portion 20, and in a state where the airbag structure 28 is flatly deployed, The front side portion 43a and the rear side portion of the surplus portion 43 (arranged on the lower side of the front seat protection portion 33 and the rear seat protection portion 34) disposed forward and backward on the front end 25b side of the overlapped expansion portion 25 It is formed so as to protrude below 43b.

  The partition coupling portion 46 is configured as a substantially rod-like shape that extends upward while curving from a portion on the lower edge side of the peripheral coupling portion 42 so as to partition the front sub-inflating portion 22 and the front seat protection portion 33. Yes. The partition coupling portion 46 is formed so that the tip protrudes upward from a partition coupling portion 48 described later. The partition coupling portion 47 is disposed as a substantially rod shape that extends upward from the lower edge side portion of the peripheral coupling portion 42 so as to partition the front seat protection portion 33 and the rear side sub-expansion portion 23. The partition coupling portion 47 includes a branch portion 47 a extending forward so as to enter the area of the front seat protection portion 33 in the vicinity of the upper and lower centers. The branch portion 47a is disposed in order to regulate the thickness of the front seat protection portion 33. The partition coupling portion 48 constitutes the lower edge side of the gas guide channel 31 and extends rearward and rearward from the upper end of the partition coupling portion 47 so as to partition the rear auxiliary expansion portion 23 from the gas guide channel 31. The end 48b is directed rearward and downward. On the front end side of the partition coupling portion 48, a circular partition portion 48a having a substantially circular shape is disposed so as to regulate the thickness of the front seat protection portion 33. The partition coupling portion 49 is partitioned from the rear end portion of the portion constituting the outer peripheral edge of the overlapping expansion portion 25 in the peripheral coupling portion 42 so as to partition the rear side secondary expansion portion 23 and the overlapping expansion portion 25. It is configured as a substantially rod-like shape extending forward and substantially parallel to the portion 48. The partition coupling portion 49 is configured so that a gap is provided between the front end 49a side and the peripheral coupling portion 42 disposed in front. In the airbag 19 of the embodiment, the gap between the partition coupling portion 46 and the upper edge side portion of the peripheral coupling portion 42 forms the upstream communication portion 36, and the rear end 48 b and the peripheral edge of the partition coupling portion 48. A gap between the portion on the lower edge side of the coupling portion 42 constitutes the upstream communication portion 37. In addition, a gap between the front end 49 a of the partition coupling portion 49 and the lower edge side portion of the peripheral coupling portion 42 constitutes the downstream side communication portion 38.

  The thickness restricting portion 50 has a substantially circular outer shape, and is disposed at a position near the front end of the gas guide channel 31 and behind the upstream communication portion 36. The thickness regulating portion 50 suppresses a large amount of inflation gas from flowing to the upstream communication portion 36 side (front side secondary inflation portion 22 side) when the main inflation portion 21 is inflated, and the gas guide channel 31. Is disposed in order to prevent the front upper portion of the front seat protection portion 33 that is integrally formed with the front seat protection portion 33 from being thickly expanded. The thickness restricting portion 51 is disposed on the lower edge side of the front seat protecting portion 33 and protrudes downward from the belt line BL, and protrudes upward from the lower edge portion of the peripheral edge coupling portion 42. Thus, the outer shape is configured as a flat, substantially T-shape. The thickness restricting portion 52 is arranged in the region of the rear seat protecting portion 34 such that the outer shape is a flat and substantially inverted V shape and the upper end protrudes upward from the partition coupling portion 47. .

  Further, in the airbag 19 of the embodiment, the connecting belt 55 separate from the airbag constituting body 28 is disposed on the front edge side of the inflating shielding portion 20 (see FIGS. 2 and 4). The connecting belt 55 is formed from a woven fabric made of polyamide yarn, polyester yarn, or the like, similar to the airbag component 28, and the base portion side is slightly above the center of the upper and lower sides of the expansion shielding portion 20. It is sewn to the front edge side and arranged so as to protrude forward. The front end side of the connecting belt 55 is a part that is attached and fixed to the inner panel 2 that is the body side member 1 by using the mounting bracket 10 and the mounting bolt 11, similarly to the mounting portion 44. It has an insertion hole (not shown) that can be inserted.

  Furthermore, in the airbag 19 of the embodiment, the overlapped inflating portion 25 is configured to separate the front and rear edges from the surplus portion 43 disposed at the front and rear, and is configured to be folded back so that the tip 25b faces upward. For this reason, the portions disposed in front and rear of the gap area formed by folding the overlapped expansion portion 25, that is, the surplus portions 43 disposed in front and rear of the overlapped expansion portion 25 before being folded back. A connecting sheet 57 as a connecting member for connecting the front side portion 43a and the rear side portion 43b is disposed. This connection sheet 57 is formed from a woven fabric made of polyamide yarn, polyester yarn or the like, similar to the airbag component 28, and has an outer shape that is defined by the front portion 43a and the rear portion 43b of the surplus portion 43. It is made into the substantially rectangular shape which can block | close the space | gap area formed between between the substantially whole surface. The connecting sheet 57 is configured such that the front edge 57a side is sewn to the front part 43a using a suture, and the rear edge 57b side is sewn to the rear part 43b using a suture.

  Next, mounting of the head protection airbag device M of the embodiment on the vehicle V will be described. The mounting portion 44 and the connecting belt 55 are sewn to the airbag structure 28, the vehicle inner side wall portion 29a and the vehicle outer side wall portion 29b are overlapped and flattened, and the flattened airbag structure 28 is obtained. The folded expansion portion 25 is folded back toward the vehicle interior at a crease CL (see FIG. 3) passing through the partition coupling portion 49 and the downstream side communication portion 38 in the front-rear direction, and the tip 25b is turned to the upper edge 20a of the expansion shielding portion. It is made to sew on the part of the surplus part 43 in the side. Thereafter, the connecting sheet 57 in a state of being flattened is disposed so as to close the opening formed by folding the overlapping expansion portion 25, and the front edge 57a side is sewn to the front side portion 43a of the surplus portion 43, The rear edge 57b side is sewn to the rear portion 43b of the surplus portion 43. Thereafter, the expansion shielding part 20 is folded so as to reduce the width dimension in the vertical direction while bringing the lower edge 20b closer to the upper edge 20a. Then, after the folding of the airbag 19 is completed, a predetermined portion is wrapped with a wrapping material (not shown) for preventing collapse. Next, the attachment bracket 10 is attached to each attachment portion 44 and the tip of the connecting belt 55. In addition, while using the clamp 16, the inflator 13 is connected to the connection port portion 32, and the mounting bracket 14 is attached around the inflator 13 to form an airbag assembly.

  Thereafter, the mounting brackets 10 and 14 are arranged at predetermined positions on the inner panel 2 and fixed to the inner panel 2 using the mounting bolts 11 and 15 to operate a predetermined inflator mounted on the vehicle V. A lead wire (not shown) extending from the control device is connected to the inflator 13. Thereafter, the front pillar garnish 4 and the roof head lining 5 constituting the airbag cover 8 are attached to the inner panel 2 that is the body side member 1, and the pillar garnishes 6 and 7 are further attached to the inner panel 2 that is the body side member 1. If attached, the head protection airbag device M can be mounted on the vehicle V.

  Then, after the head protection airbag device M is mounted on the vehicle V, if the inflator 13 is activated in response to an operation signal from the control device at the time of a side collision or rollover of the vehicle V, the vehicle is discharged from the inflator 13. The inflating gas G flows into the inflating shielding part 20 of the airbag 19 and the inflating inflating shielding part 20 breaks a wrapping material (not shown), and further, the front pillar garnish 4 and the roof head lining 5 As shown in the two-dot chain line in FIG. 1 and FIG. 6, the airbag cover 8 constituted by the lower edges 4a and 5a is pushed open and protrudes downward, and the windows W1 and W2, the center pillar portion CP, and the rear pillar portion, as shown in FIG. It will expand | swell greatly so that the vehicle inside of RP may be covered.

  In the head protection airbag device M of the embodiment, in the expansion shielding part 20 of the airbag 19, the main inflating part 21 is first inflated by flowing the inflating gas G into the inside as a primary inflating part. After the expansion of the main expansion portion 21 as the primary expansion portion is completed, the front sub-expansion portion 22 and the rear sub-expansion portion 23 complete the expansion by flowing the expansion gas G into the inside as the secondary expansion portion. (See FIG. 7). Then, after the expansion of the front side sub-expansion part 22 and the rear side sub-expansion part 23 as the secondary expansion part is completed, the overlap expansion part 25, as the tertiary expansion part, flows the expansion gas G into the inside to complete the expansion. (See FIG. 8).

  In the head protection airbag device M of the embodiment, when the airbag 19 is completely inflated, the overlap inflating portion 25 that completes the inflating after the inflating shielding portion 20 is completed is provided on the inboard side I of the inflating shielding portion 20. The expansion part 25 (gas inflow part 29) and the expansion part are arranged so as to overlap each other, and the overlapping expansion part 25 is substantially along the front-rear direction on the upper edge 20a side in the expansion shielding part 20. Cover the region of the gas guide channel 31 as a rod-shaped portion disposed in a rod shape and the rear side sub-expansion portion 23 disposed adjacent to the lower side of the gas guide channel 31 over substantially the entire upper and lower regions. It is the structure arranged. When the airbag 19 is completely inflated, the inflated portion where the gas guide channel 31 and the overlapping inflating portion 25 overlap is supported by the inner panel 2 as the body side member 1 in the portion of the roof side rail portion RR. Since it is a structure, the vehicle outer side O of the gas guide flow path 31 can be accurately supported by the inner panel 2 of the vehicle V on the upper edge side of the windows W1 and W2 at the time of rollover (see FIG. 8). . When the expansion is completed, the overlapping inflating portion 25 is supported on the vehicle outer side O on the front end 25b side by the gas guide channel 31 supported on the inner panel 2 on the vehicle outer side O. Movement will be suppressed. Further, as shown in FIG. 8, the rear side sub-expansion part 23 disposed below the gas guide channel 31 is also provided with the overlapping expansion part 25 on the vehicle interior side I. The head MH of the occupant MP moving toward the vehicle outer side O at the time of rollover is restrained from moving to the rear side sub-inflatable portion 23 and the vehicle outer side O. The overlapped expansion portion 25 can be appropriately protected. That is, in the head protection airbag device M according to the embodiment, the region on the upper edge side of the rear side secondary inflatable portion 23 that is thickly inflated is supported by the inner panel 2 as the body side member 1, thereby expanding Even when the lower edge side at the time of completion is not positioned below the belt line BL, the head MH of the occupant MP can be accurately restrained at the time of rollover.

  Therefore, in the head protection airbag device M of the embodiment, the movement of the occupant MP to the outside of the vehicle is suppressed at the time of rollover of the vehicle without positioning the lower edge side when the inflation is completed below the belt line BL. The occupant MP can be accurately restrained inside the vehicle.

  In the head protection airbag device M of the embodiment, as shown in FIG. 6, the expansion shielding part 20 is configured to position the lower edge 20 b side below the belt line BL across the entire front and rear, The parts (the rear seat protection part 34 and the rear auxiliary expansion part 23) arranged so as to cover the vehicle interior side of the window W2 when the expansion is completed are configured so that the whole is positioned above the belt line BL. Under the BL, only the surplus portion 43 that is the non-inflow portion 41 is arranged (see FIGS. 6 and 8). However, since the overlapping inflating portion 25 is disposed so as to overlap the inside of the rear auxiliary inflating portion 23 from the gas guide channel 31, the lower edge side of the gas inflow portion 29 that allows the inflating gas to flow into the inside. The head MH of the occupant MP can be accurately restrained at the time of rollover without positioning (the lower edge side of the rear seat protection part 34 and the rear sub-inflating part 23) below the belt line BL. Further, in the head protection airbag device M of the embodiment, the parts (the front seat protection part 33 and the front side secondary inflation part 22) that are arranged so as to cover the inside of the window W1 when the inflation is completed are shown in FIG. As described above, the lower edge side is positioned below the belt line BL, and is configured to expand so as to overlap the vehicle interior of the door trim T arranged on the lower edge side of the windows W1 and W2 constituting the belt line BL. Yes. Therefore, in the region located on the vehicle inner side of the window W1, the lower edge sides of the front seat protection portion 33 and the front auxiliary expansion portion 22 are respectively supported on the vehicle outer side by the door trim T, and the head of the occupant MP The MH can be protected by being accurately restrained to the vehicle interior side I.

  In the head protection airbag device M according to the embodiment, the airbag 19 is configured in such a manner that the airbag 19 is flatly deployed and the inflated portion 25 is adjacent to the lower side inflatable portion 23 below. Constructed from the body 28, the expansion expansion part 25 is configured to communicate with the rear side secondary expansion part 23 via the downstream side communication part 38 (communication part), and is expanded and shielded by folding back at the site of the downstream side communication part 38. It is arranged on the inside I of the part 20. Therefore, since the expansion gas is difficult to move between the rear side secondary expansion portion 23 and the overlap expansion portion 25 by folding back at the downstream communication portion 38, the expansion of the overlap expansion portion 25 is started. It is possible to reliably delay the start of expansion of the rear side sub-expansion part 23, and as shown in FIG. 9, the return part functions like a check valve and once flows into the overlap expansion part 25. It becomes difficult for gas to move to the rear side secondary expansion part 23 side. As a result, at the time of rollover, the internal pressure of the overlapping inflating portion 25 can be sufficiently secured, and even if the internal pressure of the inflating shielding portion 20 is reduced, the overlapping inflating portion 25 allows the head MH of the occupant MP to be moved. It can be restrained accurately. Of course, if such a point is not taken into consideration, the overlapping inflating part is separated from the inflating shielding part, and an opening for communication is provided, and the periphery of the opening for communication is sewn to the inflating shielding part. Therefore, it may be configured to communicate with the expansion shield.

  Further, in the head protection airbag device M of the embodiment, the airbag component 28 constituting the airbag 19 has a substantially rectangular shape with the outer shape in a flat deployed state except for the portion of the connection port portion 32. The overlapping inflating portion 25 is configured by separating both the front and rear edge sides from the front portion 43a and the rear portion 43b of the surplus portion 43 on the airbag constituting body side. Since the front part 43a and the rear part 43b of the surplus part 43 arranged at the front and rear of the gap area generated when the part 25 is folded back are connected to each other by a connection sheet 57 as a connection member, When the airbag 19 is completely inflated, the front-seat protecting part 33 located on the front side of the overlapping inflating part 25 and the rear-seat protecting part 34 located on the rear side Suppress the swing, such as to or close to the expanding cross, integrally, it is possible to cover the interior side of the window W1, W2. In particular, in the airbag 19 of the embodiment, as a connecting member, a void area formed between the front portion 43a and the rear portion 43b of the surplus portion 43 after the overlapped inflatable portion 25 is folded back can be closed over substantially the entire surface. Since the substantially rectangular connecting sheet 57 is used, when the airbag 19 is completely inflated, the inner side of the windows W1, W2 is shown in FIG. 6 by the expansion shielding part 20 and the connecting sheet 57. It is possible to cover substantially the entire area, and the head of the occupant can be protected more accurately. Of course, if this point is not taken into consideration, a belt-shaped member that connects only the lower edges of the front portion and the rear portion of the surplus portion may be used as the connecting member.

  In the embodiment, the overlapping inflating portion 25 is arranged on the vehicle inner side I of the inflating shielding portion 20, but the overlapping inflating portion 25 is arranged on the vehicle outer side O of the inflating shielding portion 20 as shown in FIG. You may let them. Even when the overlapping inflating portion 25 is arranged on the vehicle outer side O of the inflating shielding portion 20, a region overlapping the portion in the vicinity of the distal end 25 b of the overlapping inflating portion 25 and the gas guide channel 31 in the vehicle interior / exit direction, It will be supported by the inner panel 2, and the vehicle outer side O of the gas guide channel 31 can be supported by the inner panel 2 through the vicinity of the tip 25 b of the overlapping expansion portion 25 at the time of rollover. Similarly, since the rear side sub-expansion part 23 is also expanded with a substantial thickness, the rear side sub-expansion part 23 is disposed above the rear side sub-expansion part 23 that is thickly expanded. By supporting the vehicle outer side O on the inner panel 2, the head MH of the occupant MP can be accurately protected during rollover. From the standpoint of restraining the occupant's head as quickly as possible when the vehicle rolls over, it is preferable to place the overlapping inflatable portion inside the vehicle, but from the standpoint of protecting the occupant's head during a side collision, On the contrary, it is preferable to arrange the overlapping expansion portion on the vehicle exterior side.

  Further, in the embodiment, the rear side sub-expansion part 23 in which the overlap expansion part 25 is arranged is configured to be positioned above the belt line BL when the expansion is completed. It is good also as a structure arrange | positioned in the vehicle inner side or vehicle outer side of the site | part which protrudes below a belt line at the time of completion of expansion. Furthermore, in the embodiment, the overlapping inflating portion 25 is disposed only in a portion that covers the vehicle inner side of the window W2, but, of course, it may be disposed also in a portion that covers the vehicle inner side of the front window. Of course, when mounted on a three-row seat type vehicle, three overlapping inflating portions may be arranged corresponding to the respective windows.

DESCRIPTION OF SYMBOLS 1 ... Body side member, 2 ... Inner panel, 8 ... Air bag cover, 13 ... Inflator, 19 ... Air bag, 20 ... Inflating shielding part, 20a ... Upper edge, 21 ... Main inflating part, 23 ... Rear side inflating part (Sub-inflation part), 25 ... Overlapping inflation part, 28 ... Airbag component, 31 ... Gas guide channel (rod-like part), 38 ... Downstream communication part (communication part), MP ... Crew, MH ... Head RR ... Roof side rail part, W1, W2 ... Window, V ... Vehicle, M ... Head protection airbag device.

Claims (2)

Folded and stored in the upper edge side of the window inside the vehicle, the upper edge side is attached and fixed to the body side member of the vehicle, the inflation gas from the inflator flows in and protrudes downward from the storage part, A head protection airbag device configured to include an airbag configured to inflate so as to cover the vehicle interior of the window,
The airbag is
An expansion shield arranged to cover the inside of the window when the expansion is completed;
The inflating part of the inflating part that is in communication with the inflating part and inflates by inflating the inflating gas into the inside or the outside of the inflating part when the airbag is completely inflated, An overlapping inflatable portion arranged to overlap
And is configured to include
The expansion shield includes a main expansion section, and a sub expansion section that communicates with the main expansion section and completes expansion after completion of expansion of the main expansion section,
The main inflating portion is configured to be arranged on the upper edge side of the inflating shielding portion at the time of completion of expansion, and a rod-shaped portion formed as a substantially rod shape substantially extending in the front-rear direction.
The secondary expansion part;
Are arranged side by side in the vertical direction side,
The overlapped inflatable portion communicates with the auxiliary inflatable portion and is configured to complete inflation after completion of inflating of the auxiliary shielding portion, and when the airbag is completely inflated, from the rod-like portion to the auxiliary inflatable portion. It is configured to cover the inside of the vehicle or the outside of the vehicle over substantially the entire upper and lower parts of the part,
When the airbag is completely inflated, the inflated portion where the rod-like portion and the overlapped inflating portion overlap is supported by the body side member at the roof side rail portion. Bag device. In the state where the airbag is flatly deployed, the airbag is configured from an airbag structure configured by adjoining the overlapping inflatable portion below the auxiliary inflatable portion,
The overlapping inflatable portion is configured to communicate with the sub-inflatable portion via a communication portion, and is configured such that both front and rear edge sides are separated from the airbag component side, and folded at a portion of the communication portion. With the configuration that is arranged on the vehicle inner side or the vehicle outer side of the expansion shielding part,
The said airbag is the said airbag structure body, The site | parts arrange | positioned in the front and back of the space | gap area of the said overlap | folding expansion part which turned up are mutually connected by the connection member. The head protection airbag device according to the description.

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