JP5029578B2 - Head protection airbag device - Google Patents

Description

  The present invention is folded and housed on the upper edge side of the window on the vehicle interior side of the vehicle, and the expansion gas is allowed to flow into the interior, projecting downward from the upper edge side of the window, and covering the vehicle interior side of the window. In this way, the present invention relates to a head protecting airbag device having a configuration in which an airbag configured to complete inflation is provided.

Conventionally, in the head protection airbag device, in consideration of accurately protecting the occupant with the airbag that has been inflated even when the vehicle is rolled over, the airbag is positioned on the lower edge side of the airbag when the inflation is completed. There is a configuration that generates tension substantially along the line. Conventionally, as a head protection airbag device, there is a configuration in which a tension belt that connects a front end (rear end) to an upper edge side of a window is arranged on the rear edge side of the airbag when inflation is completed. In the tension belt of this conventional head protection airbag device, from the front end side of the main body portion where the rear end side is connected to the upper edge side of the window, the upper part and the lower part are bifurcated, It was set as the structure which connected the edge part side of each upper side site | part and a lower side site | part to the vicinity of the upper end and lower end vicinity in the rear edge side of the airbag at the time of completion of inflation, respectively. That is, in the conventional head protection airbag device, the front end side of the tension belt extending from the rear lower end side of the airbag when the inflation is completed is connected to the upper edge side of the window located behind the airbag. By pulling the lower end side of the airbag when the inflation is completed to the rear side by the belt, a tension substantially along the front-rear direction is generated on the lower edge side of the airbag when the inflation is completed (for example, Patent Document 1). reference).
JP 2000-52909 A

  In this conventional head protection airbag device, the airbag is configured to cover only the inside of the window disposed on the side of the front seat of the vehicle, and the tip of the tension belt is disposed on the side of the rear seat. Connected to the upper edge side of the window. When this conventional head protection airbag device is applied to an airbag configured to cover the inner side of a window disposed on the side of the front seat and the rear seat, the side of the rear seat is widely protected in the front-rear direction. If this is taken into consideration, the tension belt is connected at the front end side to a portion of the rear pillar portion disposed behind the rear seat side window. Considering that a large tension is generated on the lower edge side of the airbag when the inflation is completed, the tension belt is preferably disposed so as to be substantially along the front-rear direction when the airbag is completely inflated. However, when the rear pillar portion is disposed so as to extend downward from the upper edge side of the window on the rear edge side of the window, the tension belt is stored along the rear pillar portion. The distance from the rear end of the airbag to the tension belt connecting part of the body side member is compared with the linear distance connecting the rear end of the airbag when the inflation is completed and the tension belt connecting part of the body side member. And get longer. Therefore, it is necessary to make the tension belt longer than the linear distance connecting the rear end of the airbag in the airbag when the inflation is completed and the tension belt connecting portion of the body side member, and the inflation of the airbag is completed. At times, the tension belt is difficult to generate a large tension on the lower edge side, and there is a problem in that a large tension is generated on the lower edge side of the airbag when the inflation is completed.

  The present invention solves the above-described problem, and even when the tension belt is housed in a pillar portion disposed so as to extend downward from the upper edge side of the window, the inflation of the airbag is completed. It is an object of the present invention to provide a head protection airbag device capable of generating a large tension substantially along the front-rear direction on the lower edge side.

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 inflating gas is allowed to flow into the interior from the upper edge side of the window toward the lower side. It is configured to include an airbag that protrudes and completes inflating so as to cover the vehicle interior of the window,
Airbag
A bag body that is connected to the body side member on the upper edge side of the window at the completion of the expansion, and covers the vehicle interior of the window when the expansion is completed;
When the bag body is completely inflated, it is arranged on at least one edge side in the front-rear direction, and when the bag body is inflated, it extends from the bag body and the front end side is arranged on the edge side in the front-rear direction of the window. A tension belt to be connected to the body side member,
It is set as the composition provided with,
The tension belt is a head protection airbag device configured to be stored in a region of a pillar portion extending downward from the upper edge side of the window on the edge side in the front-rear direction of the window when the airbag is folded and stored,
The tension belt is formed so as to extend from a position that is an intermediate portion in the vertical direction of the bag body at the time of completion of inflation, and the front end side is connected to the body side member of the vehicle. Arranged substantially along
In the bag body, an auxiliary belt extending from the upper edge side on the edge side of at least one side in the front-rear direction on the tension belt side to the vehicle inner side is disposed,
The auxiliary belt is configured such that the base side is connected to the upper edge side of the bag body, and at least the lower side of the tension belt is connected, and the front end side is connected to the body member on the roof side located on the vehicle inner side. When the expansion of the main body is completed, it is configured to contact the tension belt so that the vicinity of the connection portion of the tension belt with the bag main body can be pulled upward.

  In the head protection airbag device according to the present invention, the roof is connected to the tension belt side of the bag body, the base part side is connected to the upper edge side of the bag body, and at least the lower side of the tension belt and the tip side is located on the vehicle interior side. An auxiliary belt configured to be connected to the body side member on the side is formed, and the auxiliary belt contacts the tension belt when the expansion of the bag body is completed, and the vicinity of the connection portion of the tension belt with the bag body is upward. Will be towed. Therefore, in the head protection airbag device of the present invention, when the airbag is folded and stored, the tension belt is stored in the region of the pillar portion extending downward from the upper edge side of the window on the edge side in the front-rear direction of the window. Even if the tension belt is pulled up by the auxiliary belt, the substantial length dimension in the front-rear direction can be shortened. Since it can be pulled to one side, a large tension that substantially follows the front-rear direction can be generated on the lower edge side of the bag body at the completion of the inflation.

  Therefore, in the head protection airbag device of the present invention, even when the tension belt is housed in the pillar portion disposed so as to extend downward from the upper edge side of the window, when the airbag is completely inflated, A large tension can be generated substantially along the front-rear direction on the lower edge side.

  In the head protection airbag device of the present invention, the auxiliary belt is configured to abut on a tension belt formed so as to extend from a position that is an intermediate portion in the vertical direction of the bag body that has been inflated. Therefore, in the folded storage state of the airbag, the intermediate part between the base part and the front end is placed in a slack state so that the base part side is placed under the folded bag body. It is connected to the upper edge side of the main body, and the front end side is connected to the roof-side body side member located on the vehicle inner side. Therefore, when connecting the folded airbag to the body side member, the auxiliary belt can be connected to the body side member without hindrance. Furthermore, in the head protection airbag device of the present invention, since the tension belt is formed so as to extend from the position near the intermediate portion in the vertical direction of the bag body that has been inflated, the expansion of the bag body is completed. Sometimes, the front side of the tension belt is connected to the attachment point to the body side member arranged on the front end side or rear end side of the bag body that is arranged to face the tension belt in the front-rear direction. The generated tension line can be generated substantially along the front-rear direction at a position in the vicinity of the lower edge of the bag body, and the auxiliary belt is located in the middle of the bag body in the up-down direction when the bag body is inflated. Since the tension belt extending from the upper side is pulled upward, the protection area on the tension belt side can be widely secured vertically.

  Further, in the head protection airbag device of the present invention, if the base part side of the auxiliary belt is configured to be fastened together with the attachment part that attaches the upper edge of the bag body to the body side member on the upper edge side of the window, It is not necessary to separately connect the base side of the belt to the upper edge side of the bag body, which is preferable because the manufacturing man-hour and cost can be reduced.

Furthermore, in the head protection airbag device configured as described above, the tension belt and the auxiliary belt are disposed on the rear edge side of the bag body,
It is preferable that the auxiliary belt is configured to abut on the tension belt in a region away from the rear edge of the inflated portion of the bag main body when the expansion of the bag main body is completed.

  If the head protection airbag device is configured as described above, the auxiliary belt that pulls the tension belt upward presses the rear edge of the inflated portion of the bag body toward the front when the bag body is completely inflated. This can be prevented, and the protection area at the completion of the expansion of the bag body can be secured widely before and after without narrowing.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the head protection airbag apparatus M according to the embodiment is configured so that the upper side of the windows (side windows) SW <b> 1 and SW <b> 2 on the vehicle inner side of the vehicle V is behind the window SW <b> 2. The rear window RW is arranged so as to be substantially orthogonal to the upper edge side of the rear window RW, and includes an airbag 20, an inflator 14, mounting brackets 11 and 15, and an airbag cover 9. ing. In FIG. 2, the inflator 14 is omitted.

  The airbag cover 9 includes a front pillar garnish 4 disposed in the front pillar portion FP, a rear pillar garnish 5 disposed in the rear pillar portion RP, and a roof headlining 6 disposed in the roof side rail portion RS and the rear roof rail portion RR. And the lower edges 4a, 5a, 6a, 6b of each (see FIGS. 1, 3, 4). The front pillar garnish 4 and the rear pillar garnish 5 are each made of synthetic resin, and are fixedly attached to the inner side of the inner panel 2 on the body 1 side in the front pillar portion FP and the rear pillar portion RP. The roof head lining 6 is made of synthetic resin and covers the entire vehicle interior side of the roof portion R (see FIG. 2) of the vehicle V including the region from the roof side rail portion RS to the rear roof rail portion RR. It is fixedly attached to the inner side of the inner panel 2 on the side. Note that the roof side rail portion RS is a region above the windows (side windows) SW1 and SW2 in the roof portion R, and the rear roof rail portion RR is a region above the rear window RW in the roof portion R. The front pillar portion FP is configured to extend downward from the upper edge side of the window SW1 on the front edge side of the window SW1, and the rear pillar portion RP is formed from the upper edge side of the window SW2 on the rear edge side of the window SW2. It is comprised so that it may extend below. Specifically, in the case of the embodiment, the front pillar portion FP and the rear pillar portion RP are each configured to be inclined with respect to the horizontal direction.

  The inflator 14 supplies inflation gas to the airbag 20 and, as shown in FIG. 1, discharges inflation gas to the tip side (in the case of the embodiment, the front end side) as a substantially cylindrical cylinder type. Possible gas discharge ports (not shown) are arranged. The inflator 14 has a front end side including the vicinity of the gas discharge port inserted into a gas inlet portion 24 (to be described later) of the bag main body 21 in the airbag 20, and is clamped on the rear end 24 a side of the gas inlet portion 24. It is connected with respect to the airbag 20 using. Further, the inflator 14 uses a mounting bracket 15 for holding the inflator 14 and a bolt 16 for fixing the mounting bracket 15 to the inner panel 2 on the body 1 side, and above the window SW2 in the inner panel 2. It is attached to the position.

  In the airbag 20, a later-described attachment portion 29 of the bag body 21, an attachment portion 36 provided on the connecting cloth portion 35, an attachment portion 39 provided on the tip 38 b side of the tension belt 38, and a tip 41 b of the auxiliary belt 41. The mounting bracket 11 for mounting the mounting portion 43 provided on the side to the inner panel 2 (body side member) on the body 1 side is composed of two sheet metal plates, as shown in FIGS. As described above, the attachment portions 29, 36, 39, 43 of the airbag 20 are sandwiched between the attachment portions 29, 36, 39, 43 and attached to the inner panel 2 using the bolts 12. ing.

  As shown in the two-dot chain line in FIG. 1 and FIG. 7, the airbag 20 flows in the inflation gas G from the inflator 14 and expands from the folded state to the windows SW1 and SW2 and the center pillar portion CP. It is set as the structure which completes expansion | swelling so that the vehicle inner side of the center pillar garnish 7 arrange | positioned inside a vehicle may be covered. In the case of the embodiment, as shown in FIGS. 5 and 6, the airbag 20 is disposed on the bag body 21 that covers the inside of the windows SW <b> 1 and SW <b> 2 when the inflation is completed, and on the rear edge 21 c side when the inflation of the bag body 21 is completed. The tension belt 38 and the auxiliary belt 41 are provided.

  In the case of the embodiment, as shown in FIGS. 1, 2, and 5, the airbag 20, the folded bag body 21, on the upper edge side of the windows SW <b> 1 and SW <b> 2, from the region above the front pillar portion FP, Through the lower edge side of the roof side rail part RS, it is accommodated in the range to the boundary part with the rear pillar part RP, the connecting cloth part 35 described later is accommodated on the lower edge side of the front pillar part FP, and the tension belt 38 is The auxiliary belt 41 is accommodated on the lower edge side of the rear pillar portion RP in the range from the window SW2 side on the lower edge side of the rear roof rail portion RR to the center in the left-right direction on the upper edge side of the rear window RW.

  The bag body 21 is connected to the inner panel 2 as a body side member on the upper edge side of the windows SW1 and SW2 on the upper edge 21a side when the inflation is completed, and folded so that the lower edge 21b side approaches the upper edge 21a side. Is housed on the upper edge side of the windows SW1, SW2. The bag body 21 is manufactured by bag weaving using polyamide yarn or the like. The bag body 21 is inflated by flowing an inflation gas G between the vehicle interior side wall portion 22a and the vehicle exterior wall portion 22b; A non-inflatable portion 27 configured to couple the side wall portion 22a and the vehicle outer side wall portion 22b so as not to allow the inflating gas to flow therein. And it is comprised as a substantially rectangular plate shape which can cover the vehicle inside of the center pillar garnish 7.

  In the case of the embodiment, the expansion part 22 includes a gas supply path part 23, a gas inlet part 24, and a protective expansion part 25.

  As shown in FIGS. 5 and 6, the gas supply path portion 23 is disposed over substantially the entire front and rear sides of the bag body 21 along the longitudinal direction of the vehicle V on the upper edge 21 a side of the bag body 21. In this configuration, the inflation gas G discharged from the inflator 14 is guided to the protective inflation portion 25 disposed below the gas supply passage portion 23. In the case of the embodiment, the gas supply path portion 23 and the protective expansion portion 25 include a thickness regulating portion 30 and horizontal bar portions 31a and 32a arranged substantially along the front-rear direction in the partition portions 31 and 32 described later. It is divided by. A gas inflow port 24 connected to the inflator 14 is communicated with the gas supply channel 23 and is located above the gas supply channel 23 at a position slightly shifted forward from the front and rear center in the gas supply channel 23. It is arrange | positioned so that it may protrude. In the case of the embodiment, the gas inflow port portion 24 is configured by opening the rear end 24a side. The inflator 14 is inserted from the opening on the rear end 24a side and the clamp 17 is mounted on the inflator 14. It will be connected with the inflator 14 using.

  In the case of the embodiment, the protective inflating portion 25 is disposed over substantially the entire region before and after the bag main body 21, and in the region, partition portions 31, 32, and 33 to be described later. And is composed of six cells 25a, 25b, 25c, 25d, 25e, and 25f arranged in parallel along the front-rear direction. Each of these cells 25a, 25b, 25c, 25d, 25e, and 25f has an expansion gas G that flows into the interior so as to separate the vehicle interior side wall portion 22a and the vehicle exterior wall portion 22b from the flat deployed state. Furthermore, it will expand so as to reduce the width dimension in the front-rear direction. Therefore, in the airbag 20 of the embodiment, the bag body 21 is inflated so that the width dimension along the front-rear direction on the lower edge 21b side where the protective inflating portion 25 is disposed is greatly reduced along the front-rear direction. Will be completed.

  In the case of the embodiment, the non-inflatable portion 27 is configured by a peripheral edge portion 28, a mounting portion 29, a thickness regulating portion 30, and partition portions 31, 32, and 33.

  The peripheral part 28 is formed so as to surround the periphery of the inflating part 22 in the bag body 21 over the entire periphery. The attachment portion 29 is formed so as to extend upward from a portion of the peripheral edge portion 28 disposed on the upper edge 21a side of the bag body 21, and is provided at a plurality of locations along the front-rear direction (four locations in the embodiment). ). The attachment portion 29 is a portion where the upper edge 21a side of the bag body 21 is connected to the body 1 side of the vehicle V, and the airbag 20 is connected to the body 1 side, and the attachment bracket 11 is connected to the body 1 side. There is provided an insertion hole 29a through which a bolt 12 for fixing to the inner panel 2 can be inserted. And each attachment part 29 will be attached and fixed to the inner panel 2 which is a body side member using the attachment bracket 11 and the volt | bolt 12. FIG.

  The thickness restricting portion 30 is arranged so as to partially partition the protective inflating portion 25 and the gas supply path portion 23 in the area of the cell 25a in the vicinity of the front end of the protective inflating portion 25. The major axis is substantially elliptical along the front-rear direction. The partition portion 31 is disposed at a position that is substantially the center in the front-rear direction in the protective expansion portion 25, and is a horizontal bar portion that is disposed along the front-rear direction so as to partition the gas supply path portion 23 and the protective expansion portion 25. 31a, a vertical bar portion 31b extending diagonally forward and downward from the front end of the horizontal bar portion 31a to partition between the cells 25a and 25b, and extending diagonally rearward and downward from the rear end of the horizontal bar portion 31a between the cells 25d and 25e. A vertical bar portion 31c for partitioning and a vertical bar portion 31d extending downward from the vicinity of the front and rear centers of the horizontal bar portion 31a to partition the cells 25c and 25d are provided. The partition portion 32 is disposed on the rear end side of the protective inflating portion 25 and extends from the rear edge side portion of the bag body 21 in the peripheral edge portion 28 along the front-rear direction to extend from the gas supply path portion 23 and the protective inflating portion. 25, and a vertical bar portion 32b extending diagonally rearward and downward from the front end of the horizontal bar portion 32a to partition the cells 25e and 25f. The partition part 33 is formed so as to extend upward from a portion on the lower edge 21b side of the bag body 21 in the peripheral part 28, and between the vertical bar parts 31b and 31d in the partition part 31, between the cells 25b and 25c. It is arranged to partition.

  Further, in the airbag 20 of the embodiment, a connecting cloth portion 35 having a substantially triangular plate shape is disposed on the front edge side of the bag body 21. The connecting cloth part 35 is formed of a flexible cloth material as a separate body from the bag body 21, and is sewn to the front edge side of the bag body 21 using a suture thread. In the case of the embodiment, the connection cloth part 35 includes an attachment part 36 attached to the inner panel 2 on the upper edge side in the vicinity of the connection part with the bag body 21 and on the front end (front end) side. The attachment portion 36 is attached and fixed to the inner panel 2 by using the attachment bracket 11 and the bolt 12 in the same manner as the attachment portion 29 in the bag body 21, and the insertion holes 36 a through which the bolts 12 can be inserted. Is provided. The connecting cloth portion 35 is for attaching the attachment portion 36 to the inner panel 2 on the lower edge side of the front pillar portion FP disposed in front of the window SW1, and when the airbag 20 is folded and stored, the front pillar portion FP. It is folded and stored in the area on the lower edge side.

  The tension belt 38 is composed of a belt-like cloth material separated from the bag main body 21, and the base portion 38 a (front end) side is a substantially vertical center of the bag main body 21, and the rear end of the peripheral portion 28. It is formed so as to be sewn to the edge side portion and to extend rearward substantially along the front-rear direction from the rear edge side of the bag body 21. On the front end 38b (rear end) side of the tension belt 38, an attachment portion 39 attached to the inner panel 2 as a body side member is formed. The attachment portion 39 is attached and fixed to the inner panel 2 using the attachment bracket 11 and the bolt 12, similarly to the attachment portion 29 in the bag body 21, and includes an insertion hole 39 a through which the bolt 12 can be inserted. ing. This attachment portion 39 is located behind the sewn portion with the bag body 21 so that the tension belt 38 can be arranged substantially along the front-rear direction when the expansion of the bag body 21 is completed. The rear pillar portion RP disposed on the rear edge side is fixedly mounted at a position that is substantially in the middle of the upper and lower sides. Specifically, the tension belt 38 is substantially parallel to the belt line BL extending along the front-rear direction composed of the lower edges of the windows SW1 and SW2 when the airbag 20 is completely inflated without the auxiliary belt 41 being disposed. It will be arranged so that it may become (refer to Drawing 9).

  Further, the tension belt 38 has a length dimension L1 (see FIG. 6) of a distance H1 (in other words, a distance H1 from the portion where the attachment portion 29B of the inner panel 2 of the vehicle V is attached to the portion where the attachment portion 39 on the tip 38b side is attached (in other words For example, when the airbag 20 is folded and stored, the distance between the portions where the tension belt 38 is stored (see the two-dot chain line in FIG. 8) is substantially the same. And in the vehicle V which mounts the head protection airbag apparatus M of embodiment, the rear pillar part RP which accommodates the tension belt 38 inclines with respect to a horizontal direction so that a lower end side may be located back. Therefore, the length dimension L1 of the tension belt 38 is determined by the rear edge 21c of the bag body 21 and the attachment portion on the inner panel 2 when the airbag 20 in a flatly deployed state is attached to the upper edge side of the window SW1. It becomes larger than the linear distance LD1 (see the two-dot chain line in FIG. 9) connecting the part to which 39 is attached. However, in the embodiment, the protective inflating portion 25 of the bag main body 21 is composed of six cells 25a, 25b, 25c, 25d, 25e, and 25f divided in the front and rear directions. The tension belt 38 is configured to complete the inflation by greatly reducing the width dimension along the front-rear direction on the side of the lower edge 21b on which the belt 25 is disposed. When the inflation is completed, the bag body 21 is disposed in a stretched state so as to generate a tension T1 substantially along the front-rear direction between the rear edge 21c of the bag body 21 and the attachment portion 39.

  The auxiliary belt 41 is disposed on the rear edge 21c side on the tension belt 38 side in the bag body 21, and is composed of a flexible belt-like cloth material, and the upper edge 21a of the bag body 21. It is arrange | positioned so that it may extend toward the vehicle inside I from (refer FIG. 3). When the auxiliary belt 41 is mounted on the vehicle, the base 41a side disposed on the vehicle outer side O of the bag main body 21 is connected to the upper edge 21a side of the bag main body 21 and passes through at least the lower side of the tension belt 38 (see FIG. 7 and 8), the front end 41b side is connected to the inner panel 2 as a body side member in a portion of the rear roof rail portion RR located on the vehicle inner side I. Specifically, the auxiliary belt 41 is sewn to an attachment portion 29B disposed on the rear end side of the bag body 21 with the base portion 41a side as a co-fastening portion 42, and is attached together with the attachment portion 29B. The bracket 11 and the bolt 12 are used to fasten the inner panel 2 together. The joint portion 42 is formed with an insertion hole 42a through which the bolt 12 can be inserted. On the front end 41b side of the auxiliary belt 41, a mounting portion 43 that is attached to the inner panel 2 as a body side member is formed. The attachment portion 43 is attached and fixed to the inner panel 2 using the attachment bracket 11 and the bolt 12, similarly to the attachment portion 29 in the bag body 21, and includes an insertion hole 43 a through which the bolt 12 can be inserted. ing. Further, in the case of the embodiment, the attachment portion 43 of the auxiliary belt 41 is attached to a portion of the rear roof rail portion RR that is substantially the center on the left and right (approximately the center on the left and right of the vehicle V) (see FIG. 3). When the expansion of the bag main body 21 is completed, the auxiliary belt 41 abuts the intermediate portion in the vicinity of the connection portion of the tension belt 38 with the bag main body 21 (the boundary portion 38c with the bag main body 21). In the state of being bent at the part of the contact part 41c with the tension belt 38 so as to generate tension between the joint part 42 and the contact part 41c and the attachment part 43, respectively. Will be arranged (see FIGS. 7 and 8).

  In the case of the embodiment, the auxiliary belt 41 has a length dimension L2 (a distance from the insertion hole 42a of the joint portion 42 to the insertion hole 43a of the attachment portion 43), and the tension belt 38 when the expansion of the bag body 21 is completed. By contacting the vicinity of the connecting portion with the bag main body 21 (near the boundary portion 38c with the bag main body 21) and pulling the vicinity of the boundary portion 38c upward, the tension belt 38 is tensioned substantially along the front-rear direction. T1 is generated, and is set to a dimension capable of generating a tension T4 substantially along the front-rear direction on the lower edge 21b side of the bag body 21 when inflation is completed. In other words, the length L2 of the auxiliary belt 41 is equal to the boundary portion 38c between the attachment portion 29B and the bag body 21 in the tension belt 38 in the bag body 21 that has been inflated without the auxiliary belt 41 being disposed. And the linear distance LD3 from the boundary part 38c to the left and right central part (the part to which the mounting portion 43 of the inner panel 2 is fixed) from the boundary part 38c. (See FIG. 9). FIG. 9 is a view for comparison with the airbag 20 of the embodiment, and shows a state in which the expansion of the bag body 21 having a configuration in which the auxiliary belt 41 is not disposed.

  Further, the attachment portion 43 of the auxiliary belt 41 is disposed at a position where the upper and lower positions and the front and rear positions substantially coincide with the joint fastening portion 42 as viewed from the left and right direction sides. As shown in FIG. 4, the front end 41b side is connected to the inner panel 2 of the rear roof rail portion RR through the lower side of the folded bag body 21. That is, the auxiliary belt 41 is arranged so as to be substantially along the left-right direction both when the bag body 21 is folded and stored and when the bag body 21 is completely inflated. And in embodiment, the attaching part 29B of the bag main body 21 which attaches the joint fastening part 42 of the auxiliary | assistant belt 41 is formed in the position which becomes a little forward from the rear edge 21c of the bag main body 21 (refer FIG. 5). That is, in the head protection airbag device M of the embodiment, the auxiliary belt 41 straddles the lower side of the folded bag body 21 at a position slightly ahead of the rear edge 21c of the folded bag body 21. Will be placed. However, in the head protection airbag device M of the embodiment, as described above, the bag body 21 has a width dimension along the front-rear direction on the lower edge 21b side where the protective inflating portion 25 is disposed in the front-rear direction. Therefore, when the expansion of the bag main body 21 is completed, the auxiliary belt 41 has a trailing edge (in the protective expansion portion 25 in the protective expansion portion 25) as shown in FIG. The tension belt 38 comes into contact with a boundary portion 38c with the bag body 21 that is a region separated rearward from the rear edge of the cell 25f.

  Next, the mounting of the head protection airbag device M of the embodiment on the vehicle V will be described. First, the airbag 20 is manufactured by sewing the connecting cloth portion 35, the tension belt 38, and the auxiliary belt 41 to the bag body 21. Thereafter, the bag body 21 is folded together with the connecting cloth portion 35 with a fold along the front-rear direction so that the lower edge 21 b side approaches the upper edge 21 a side. Specifically, as shown in FIG. 7, the bag body 21 is formed by bellows folding the portion of the gas supply passage portion 23, and the portion of the protective inflating portion 25 positioned below the gas supply passage portion 23 with the lower edge 21 b. It is folded by roll folds such that the side is wound around the outside of the vehicle. After the folding of the bag body 21 is completed, a predetermined portion of the folded bag body 21 is wrapped with a wrapping material (not shown) that can be broken to prevent the folding. Next, the attachment bracket 11 is attached to each attachment portion 29 (29B), 36, 39. At this time, the joint portion 42 of the auxiliary belt 41 is sandwiched between the attachment bracket 11 together with the attachment portion 29B. Thereafter, the inflator 14 is connected to the gas inlet port 24 while using the clamp 17. Then, an attachment bracket 15 is attached around the inflator 14 to form an airbag assembly.

  Thereafter, the mounting brackets 11 and 15 are arranged at predetermined positions on the inner panel 2 and are fixedly mounted using the bolts 12 and 16, and the airbag assembly is attached to the body 1. Next, a lead wire (not shown) extending from a predetermined control device for inflator operation is connected to the inflator 14, and the front pillar garnish 4, the rear pillar garnish 5, and the roof head lining 6 are connected to the inner panel 2 on the body 1 side. If the center pillar garnish 7 is attached to the inner panel 2 on the body 1 side, the head protection airbag device M can be mounted on the vehicle V.

  If the inflator 14 is activated after the head protection airbag device M is mounted on the vehicle V, the inflation gas G from the inflator 14 flows into the bag body 21 in the airbag 20 as shown in FIG. Then, the bag body 21 breaks a wrapping material (not shown), and further pushes the airbag cover 9 constituted by the front pillar garnish 4, the rear pillar garnish 5, and the lower edges 4a, 5a, 6a, 6b of the roof head lining 6. As shown in the two-dot chain line in FIG. 1 and FIG. 7, while opening and projecting downward, the windows SW1 and SW2 and the center pillar portion CP are inflated so as to cover the inside of the vehicle.

  In the head protecting airbag device M according to the embodiment, the base portion 41a side is connected to the upper edge 21a side of the bag body 21 on the tension belt 38 side of the bag body 21, and at least the lower side of the tension belt 38. An auxiliary belt 41 configured by connecting the front end 41b side to the inner panel 2 disposed on the rear roof rail portion RR located on the vehicle inner side I is formed through the lower side of the folded bag body 21, and this auxiliary When the expansion of the bag main body 21 is completed, the belt 41 comes into contact with the vicinity of the connection portion of the tension belt 38 with the bag main body 21 (the boundary portion 38c with the bag main body 21) and pulls the vicinity of the boundary portion 38c upward. As a result, a tension T1 substantially along the front-rear direction is generated on the tension belt 38 (see FIG. 8). Therefore, in the head protection airbag device M of the embodiment, the tension belt 38 is in the region of the rear pillar portion RP that extends downward from the upper edge side of the window SW2 at the rear edge of the window SW2 when the airbag 20 is folded and stored. Even in the case where the tension belt 38 is housed, the tension belt 38 is pulled up by the auxiliary belt 41 and the length in the front-rear direction can be reduced. The vicinity can be pulled backwards. More specifically, in the head protection airbag device M according to the embodiment, when the expansion of the bag body 21 is completed, the cells 25a, 25b, 25c, 25d, 25e, and 25f constituting the protective inflation portion 25 are contracted. At the same time, a tension T2 that substantially extends in the front-rear direction is generated on the tension belt 38, and at the same time, a tension T3 that is pulled up by the auxiliary belt 41 toward the rear and upward is generated in addition to the tension T2 (see FIG. 8). ). Therefore, a large tension T1 substantially along the front-rear direction, which is the resultant force of these tensions T2 and T3, is generated on the tension belt 38. A large tension T4 substantially along the direction can be generated (see FIG. 8). In the head protection airbag device M of the embodiment, a tension approximately five times higher than that of the airbag having the same shape that does not include an auxiliary belt can be generated on the lower edge side of the bag body. In the airbag 20 of the embodiment, when the expansion of the bag body 21 is completed, the attachment portion 36F disposed on the front end side of the connecting cloth portion 35 and the attachment portion 39 formed on the rear end side of the tension belt 38 are connected. Thus, the tension line TL is generated (see FIG. 7), and the tension T4 generated on the lower edge 21b side of the bag body 21 acts substantially along the tension line TL.

  Therefore, in the head protection airbag device M of the embodiment, even if the tension belt 38 is housed in the portion of the rear pillar portion RP that is arranged to extend downward from the upper edge side of the window SW2, the airbag When the expansion of 20 is completed, a large tension T2 can be generated substantially along the front-rear direction on the lower edge 21b side.

  In the head protecting airbag device M of the embodiment, the auxiliary belt 41 is brought into contact with a tension belt 38 formed so as to extend from a position that is an intermediate portion in the vertical direction of the bag body 21 that has been inflated. Therefore, when the airbag 20 is in the folded storage state, the intermediate portion between the base portion 41a and the tip 41b is placed under the folded bag body 21 in a slack state. The base portion 41a side is connected to the upper edge 21a side of the bag body 21, and the front end 41b side is connected to the inner panel 2 disposed on the rear roof rail portion RR that is the roof side located on the vehicle interior side. (See FIG. 3). Therefore, when the folded airbag 20 is connected to the inner panel 2, the auxiliary belt 41 can be connected to the inner panel 2 without hindrance. Furthermore, in the head protection airbag device M of the embodiment, the tension belt 38 is formed so as to extend from a position near the center in the vertical direction of the bag body 21 that has been inflated. The tension line TL (see FIG. 7) generated so as to connect the attachment portion 36F and the attachment portion 39 formed on the rear end side of the tension belt 38 at the completion of the inflation of the bag main body 21 near the lower edge 21b In the bag main body 21 at the completion of the inflation, the auxiliary belt 41 extends above the tension belt 38 extending from a portion near the center in the vertical direction of the bag main body 21. Therefore, the protection area in the area on the rear edge 21c side, which is on the tension belt 38 side, can be secured widely in the vertical direction. Of course, if this point is not taken into consideration, the tension belt should extend from a position above the center of the top and bottom of the bag body when the inflation is completed and from a position that is the lower edge side of the bag body when the inflation is completed. You may form in.

  Further, in the head protection airbag device M of the embodiment, the base 41a side of the auxiliary belt 41 is used as the fastening portion 42, and the upper edge 21a of the bag body 21 is attached to the inner panel 2 on the upper edge side of the window SW2. Since it is configured to be fastened together with the portion 29B, it is not necessary to separately connect the base portion side of the auxiliary belt to the upper edge side of the bag main body, and the manufacturing man-hour and cost can be reduced. Of course, if such a point is not taken into consideration, the base part side of the auxiliary belt may not be fastened together with the attachment part, and may be separately connected to the upper edge side of the bag body by stitching or adhesion.

  Furthermore, in the head protection airbag device M of the embodiment, the tension belt 38 and the auxiliary belt 41 are disposed on the rear edge 21c side of the bag body 21, and the auxiliary belt 41 completes the expansion of the bag body 21. In some cases, the tension belt 38 is brought into contact with the rear edge of the rear portion of the inflated portion of the bag body 21 (the rear edge of the cell 25f in the protective inflating portion 25). Therefore, when the expansion of the bag main body 21 is completed, the auxiliary belt 41 pulling the tension belt 38 upward presses the rear edge of the cell 25f in the protective expansion portion 25 of the bag main body 21 toward the front. This can be prevented, and the protection area at the completion of the expansion of the bag body 21 can be secured widely before and after without narrowing. Of course, if such a point is not taken into consideration, the auxiliary belt may be arranged at a position where it comes into contact with the rear edge of the inflated portion when the inflating of the bag body is completed.

  In the embodiment, the auxiliary belt 41 passes through the lower side of the folded bag body 21, the attachment portion 43 on the tip 41 b side is on the left side of the joint fastening portion 42 on the base portion 41 a side, and the rear roof rail portion. Although it is the structure which is attached to the site | part used as the approximate center of right and left in RR, the attachment position of the base part side and front-end | tip side of an auxiliary belt is not restricted to this, When the expansion of a bag main body is completed, a tension belt The attachment position is not particularly limited as long as the tension belt is configured to generate tension substantially along the front-rear direction by pulling the belt upward. Further, the auxiliary belt may be arranged so as to pass at least the lower side of the tension belt without passing through the lower side of the bag body. Therefore, for example, as a configuration in which the auxiliary belt is attached to the body side member at a position that is behind the base side of the auxiliary belt through the lower side of the tension belt positioned behind the bag body, It is good also as a structure arrange | positioned so that it may incline with respect to the left-right direction. On the contrary, the auxiliary belt may be configured to be attached to the body side member at a position where the front end side is forward from the base side of the auxiliary belt through the lower side of the tension belt located in the publication of the bag body. Further, the attachment position on the tip side of the auxiliary belt can be provided at any position on the right side (device side) or the left side (side away from the device) from the center in the left-right direction of the vehicle.

  In the head protecting airbag device M according to the embodiment, when the airbag 20 is completely inflated, tension is generated in the auxiliary belt 41 along the auxiliary belt 41, and this tension is applied to the tension belt 38 in the auxiliary belt 41. It will arise so that it may go to the attaching part 43 by the side of the front-end | tip 41b from a contact part. In other words, the auxiliary belt 41 pulls the bag body 21 along the length direction of the auxiliary belt 41 at the contact portion with the tension belt 38. Therefore, when the attachment portion of the auxiliary belt 41 on the tip 41b side to the inner panel 2 is close to the device side (window SW1, SW2 side), the tension acting on the auxiliary belt 41 causes the bag body 21 to 38, when the attachment site to the inner panel 2 on the tip 41b side of the auxiliary belt 41 is far from the device side (window SW1, SW2 side). The tension acting on the auxiliary belt 41 is such that the bag body 21 is pulled toward the inside of the vehicle at the contact portion of the tension belt 38. In consideration of protecting passengers accurately even during rollover, it is desirable to pull the bag body toward the inside of the vehicle. In this embodiment, the left and right sides of the vehicle far from the device side (window SW1, SW2 side) are used. The front end 41b side of the auxiliary belt 41 is attached to a position that is approximately the center in the direction.

  In the embodiment, the tension belt 38 and the auxiliary belt 41 are arranged on the rear edge 21c side of the bag body 21, but the arrangement positions of the tension belt and the auxiliary belt are not limited to this, and the bag body It is good also as a structure arrange | positioned on the front edge side of this, or the front-and-rear both-ends side of a bag main body.

It is a schematic front view which shows the vehicle mounting state of the head protection airbag apparatus which is one Embodiment of this invention. It is the partial expansion perspective view which looked at the vehicle which shows the vehicle mounting state of the head protection airbag apparatus of embodiment from the back side. It is a schematic sectional drawing of the III-III site | part in FIG. It is a schematic sectional drawing of the IV-IV site | part in FIG. It is a front view of the state where the air bag used for the head protection air bag device of an embodiment was developed flat. It is a front view which shows the state which expand | deployed the member which comprises the airbag of FIG. 5 flatly. In the head protection airbag device of an embodiment, it is the outline perspective view seen from the car inside which shows the state where the airbag completed inflation. In the head protection airbag device of an embodiment, it is the partial expansion front seen from the car inside which shows the state where the airbag completed inflation. FIG. 5 is a schematic perspective view of a head protection airbag device according to the present invention, as viewed from the vehicle interior side, showing a state in which an airbag having a configuration without an auxiliary belt has been inflated.

Explanation of symbols

1 ... Body
2 ... Inner panel,
4 ... Front pillar garnish,
5 ... Rear pillar garnish,
6 ... Roof head lining,
9 ... Airbag cover,
14 ... Inflator,
20 ... Airbag,
21 ... Bag body,
22 ... inflatable part,
29, 29B ... mounting portion,
38 ... tension belt,
39 ... Mounting part,
41 ... auxiliary belt,
42 ... joint tightening part,
43 ... Mounting part,
FP ... Front pillar part,
RP ... Rear pillar part,
RR ... Rear roof rail part,
RS ... Roof side rail part,
RW ... Rear window,
SW1, SW2 ... windows (side windows),
M: Head protection airbag device.

Claims (3)

It is folded and stored on the upper edge side of the window inside the vehicle, and the expansion gas is allowed to flow into the inside so that it protrudes downward from the upper edge side of the window and covers the inside of the window. An air bag configured to complete the inflation is configured to be provided,
The airbag is
A bag body that is connected to the body side member on the upper edge side of the window at the completion of the expansion, and covers the vehicle interior side of the window when the expansion is completed;
The bag body is disposed on at least one edge side in the front-rear direction when the bag body is completely inflated, and extends from the bag body when the bag body is inflated, and the front end side is the edge in the front-rear direction of the window. A tension belt to be connected to a body side member arranged on the side,
It is set as the composition provided with,
The head protection airbag device having a configuration in which the tension belt is stored in a region of a pillar portion extending downward from the upper edge side of the window on the edge side in the front-rear direction of the window when the airbag is folded and stored. Because
The tension belt is formed to extend from a position that is an intermediate portion in the vertical direction of the bag main body when the expansion is completed, and the front end side is connected to the body side member of the vehicle, and the expansion of the bag main body is completed. Sometimes arranged along the front-rear direction,
In the bag body, an auxiliary belt extending from the upper edge side on the edge side of at least one side in the front-rear direction on the tension belt side to the vehicle inner side is disposed,
The auxiliary belt is configured such that the base side is connected to the upper edge side of the bag body, and at least the lower side of the tension belt is connected to the front side of the body side member on the roof side located on the vehicle interior side. In addition, when the bag body is completely inflated, the head protection air is configured to be able to pull up the vicinity of the connection portion of the tension belt with the bag body by contacting the tension belt. Bag device.   2. The head according to claim 1, wherein the auxiliary belt is fastened together with a mounting portion for attaching the upper side of the bag to the body side member on the upper edge side of the window. Protective airbag device. The tension belt and the auxiliary belt are disposed on the rear edge side of the bag body,
3. The auxiliary belt is in contact with the tension belt in a region separated rearward from a rear edge of the inflated portion of the bag body when the bag body is completely inflated. Head protection airbag device.

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