JP2015105035A - Head-protective airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head-protective airbag device capable of accurately protecting an occupant head moving outside a vehicle at rollover of the vehicle by inhibiting movement to outside of the vehicle.SOLUTION: A head-protective airbag device is provided with an airbag 20 comprising a bag body 21, a tension belt 51 extending from the front end side of the bag body 21, and a support member 54 covering the vehicle outside of the bag body 21. In the bag body 21, an end side inflation part 33 partitioned from another general inflation part 34 by a partition part 44 is disposed at a front end side. The support member 54 is disposed at the vehicle outside O of the end side inflation part 33 on completion of inflation, and the edge part of a root part side is joined to the partition part 44 and the lower edge side of the bag body 21. In the support member 54, the tip side thereof is fixed to the fixing region of a vehicle body 1 side in the rim of a window W1 together with an installation part 52 formed at the tip side of the tension belt 51.

Description

  The present invention is folded and housed on the upper edge side of the window inside the vehicle, the upper edge side is attached and fixed to the body side of the vehicle, the inflation gas from the inflator is allowed to flow in, and the window The present invention relates to a head protecting airbag device configured to include an airbag configured to be deployed and inflated so as to cover the inside of a vehicle.

  Conventionally, as a head protection airbag device, a partition portion formed so as to extend upward from a lower edge side on the front end side of a bag body that expands and inflates so as to cover the vehicle interior side of the window, An end-side inflating portion to be partitioned is disposed, and the vehicle inner side and the vehicle outer side of the end-side inflating portion are covered with two cover members coupled to the partitioning portion on the base side, There is a configuration in which the front end side of each cover member is connected to the tension belt at the front position, and the front end side of the tension belt is fixed to the vehicle body side at the periphery of the window (for example, see Patent Document 1). ).

  In this conventional head protection airbag device, when the airbag is completely inflated, the two cover members are arranged with the end-side inflating portion between them, and the portion on the base side is separated in the vehicle interior / exit direction Thus, the separation distance is reduced toward the front end side, and the head portion of the occupant can be protected even at the portion of the cover member.

US Pat. No. 8,282,125 (FIGS. 7 and 7A)

  However, in the conventional head protection airbag device, the front end side of the cover member is connected to one tension belt, and the front end side of the tension belt is fixed to the vehicle body side. When the inflation is completed, tension is generated on the cover member integrally with the bag body from the front end side of the tension belt in the front-rear direction. Therefore, even if the cover member arranged on the vehicle outer side covers the vehicle outer side of the end-side expansion part, the cover member cannot accurately support the end-side expansion part that moves to the vehicle outer side. When the occupant's head abuts against the end-side inflating portion at the time of rollover, the occupant's head may be prevented from being accurately protected by the end-side inflating portion by suppressing the movement to the outside of the vehicle.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and suppresses the movement of the occupant's head that moves to the outside of the vehicle when the vehicle rolls over, thereby accurately protecting the head protection air. An object is to provide a bag device.

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, the upper edge side is attached and fixed to the vehicle body side, and the inflation gas from the inflator is allowed to flow in. A head protection airbag device configured to include an airbag configured to expand and inflate so as to cover the vehicle interior of the window while protruding downward,
Airbag
A bag body that is flexible and has an upper edge fixed to the vehicle body on the upper edge of the window at a plurality of locations along the front-rear direction;
A tension belt formed so as to extend from one end side in the front-rear direction of the bag body, and fixing the front end side to the vehicle body side at the periphery of the window away from the end of the bag body;
A support member that is configured from a flexible sheet body and that is disposed so as to cover the outside of the bag body when the expansion of the bag body is completed;
And is configured to include
The bag body includes an end-side inflating portion that is partitioned from the other general inflating portions by a partitioning portion that is formed substantially along the vertical direction on the end portion in the front-rear direction that is the tension belt side when the inflating is completed. With the configuration,
The tension belt extends from the bag body, and is configured by disposing an attachment portion fixed to the peripheral edge of the window on the distal end side.
The support member is disposed at a position on the vehicle exterior side of the end side inflatable portion when the inflation is completed, and the lower edge is substantially aligned with the lower edge of the bag body so that the edge substantially along the vertical direction on the base side The portion is configured to be coupled to the partition portion and the lower edge side of the bag body, and the tip end side is fixed to a fixing portion on the vehicle body side together with the attachment portion of the tension belt.

  In the head protection airbag device according to the present invention, the support member disposed so as to cover the vehicle exterior side of the end side inflating portion when the airbag has been inflated is configured such that the front end side is attached to the body side of the vehicle along with the attachment portion of the tension belt. Therefore, when the airbag is completely inflated, tension is generated substantially along the front-rear direction on each of the support member and the tension belt. Further, the support member divides the end side inflating portion and the general inflating portion into an edge portion substantially along the vertical direction on the base portion side so that the lower edge substantially coincides with the lower edge of the bag body. The partition portion and the lower edge side of the bag body are coupled. Therefore, the support member supports the vehicle outer side of the part from the tension belt to the end side inflated portion when the bag body is completely inflated, so that the support member moves toward the vehicle outer side when the vehicle rolls over. When the head of the occupant comes into contact with the inflated end-side inflating portion, the support member can accurately support the vehicle outer side of the tension belt and the lower region of the end-side inflating portion. The bag body can be accurately restrained from starting from the tension belt so as to be twisted while the lower edge is directed to the outside of the vehicle. Therefore, when the vehicle rolls over, the end-side inflating portion that supports the outside of the vehicle by the support member can suppress further movement of the occupant's head to the outside of the vehicle, and can be protected accurately.

  Therefore, in the head protection airbag device of the present invention, when the vehicle rolls over, the occupant's head that moves to the outside of the vehicle can be protected accurately by suppressing the movement to the outside of the vehicle.

  Further, in the head protection airbag device of the present invention, the tension belt is arranged at a position away from the lower edge of the bag body, and the support member is only in the region from the outside of the tension belt to the lower side. If it is set as the structure to arrange | position, while the usage-amount of the base material which comprises a supporting member can be reduced, while being able to reduce manufacturing cost and also being able to fold an airbag compactly, it is preferable. .

  Further, in the head protection airbag device of the present invention, the support member may be arranged only in a region below the attachment portion attached to the fixed portion on the vehicle body side when the inflation of the bag body is completed. Even in such a configuration, the usage amount of the base material constituting the support member can be reduced, the manufacturing cost can be reduced, and the airbag can be folded compactly. It is preferable.

  Furthermore, in the head protection airbag device having the above-described configuration, the lower edge side substantially along the front-rear direction of the support member may be coupled to the lower edge side substantially along the front-rear direction of the bag body.

  Furthermore, in the head protection airbag device having the above-described configuration, if the bag body is configured such that the lower edge side when the inflation is completed is positioned above the belt line formed from the lower edge of the window, The volume can be reduced, the inflator can be prevented from increasing in size, and the entire apparatus can be made compact, which is preferable.

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 the front view seen from the car inside which shows the state where the air bag used with the head protection air bag device of an embodiment was developed flat. FIG. 3 is a partially enlarged rear view showing an end-side inflating portion and a support member in the airbag of FIG. 2. FIG. 4 is a partial enlarged cross-sectional view of the IV-IV part in FIG. 2. FIG. 3 is a front view showing a state in which a bag main body to which a tension belt is connected and a support member are arranged in the airbag of FIG. 2. In the airbag of FIG. 2, it is a top view which shows the base material for support members which comprises a support member. 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 the embodiment, it is a schematic cross-sectional view along the front-rear direction showing a state in which the airbag is completely inflated. In the head protection airbag device of an embodiment, it is a schematic cross section along the up-and-down direction which shows the state where the airbag completed inflation. In the airbag of the other form of this invention, it is a partial expansion rear view which shows an end side expansion part and a supporting member. It is sectional drawing of the XI-XI site | part of FIG.

  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 20, an inflator 14, mounting brackets 11 and 16, and an airbag cover 9. As shown in FIG. 1, the airbag 20 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 FIGS. 1 and 7 to 9, the airbag cover 9 is provided under the front pillar garnish 4 disposed in the front pillar portion FP and the roof head lining 5 disposed in the roof side rail portion RR. Consists of edges. 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 on the body 1 (vehicle body) side in the front pillar portion FP and the roof side rail portion RR, respectively. ing. Further, the airbag cover 9 is pushed by the airbag 20 so as to cover the inside of the airbag 20 that is folded and stored, and to allow the airbag 20 to be protruded downward in the interior of the vehicle when deployed. It can be opened inside the vehicle (see FIGS. 8 and 9).

  The inflator 14 supplies inflation gas to the airbag 20, 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 14 inserts the tip side including the vicinity of the gas discharge port into a connection port 29 described later of the airbag 20, and uses the clamp 15 disposed on the outer peripheral side of the connection port 29 to attach the airbag 20 to the airbag 20. Are connected to each other. Further, the inflator 14 uses an attachment bracket 16 for holding the inflator 14 and a bolt 17 for fixing the attachment bracket 16 to the inner panel 2 on the body 1 side, so that (See FIG. 1). The inflator 14 is electrically connected to a control device (not shown) of the vehicle via a lead wire (not shown). When the control device detects a side collision or rollover of the vehicle V, the inflator 14 is actuated from the control device. It is configured to operate upon input of a signal.

  Each mounting bracket 11 is composed of two sheet metal plates, and each mounting portion 42, 52, 55, which will be described later, of the airbag 20 is sandwiched from the front and back to each mounting portion 42, 52, 55. The bolts 12 are used to attach and fix the mounting portions 42, 52, and 55 to the inner panel 2 on the body 1 side (see FIGS. 1, 8, and 9).

  As shown in FIGS. 2 to 5, the airbag 20 includes a bag body 21, a tension belt 51 coupled to one end side in the front-rear direction of the bag body 21 (in the embodiment, the front end 21 a side), and the bag body 21. The support member 54 is provided so as to cover the vehicle outer side O of the bag body 21 when the expansion of the bag is completed.

  As shown in FIGS. 2 to 5, the bag body 21 includes an expansion shield 22 disposed so as to cover the vehicle interior side of the windows W <b> 1 and W <b> 2 when inflation is completed, and the upper edge 22 a side of the expansion shield 22 on the body 1 side. And a plurality of attachment portions 42 attached to the inner panel 2. When the expansion of the bag body 21 is completed, as shown in FIG. 7, the expansion shielding portion 22 can cover the inside of the vehicle from the window W1 to the front side of the rear pillar portion RP via the center pillar portion CP and the window W2. The shape is a substantially rectangular plate whose longitudinal direction is substantially along the front-rear direction. Further, in the case of the embodiment, as shown in FIG. 7, the expansion shielding part 22 positions the lower edge 22 b at the completion of the expansion above the belt line BL composed of the lower edges of the windows W <b> 1 and W <b> 2. The upper and lower width dimensions are set.

  In the case of the embodiment, as shown in FIG. 2, the expansion shield part 22 communicates with the main expansion part 23 by inflating the expansion gas G discharged from the inflator 14 and expands. A front side sub-expansion part 24 and a rear side sub-expansion part 25 that complete the expansion after the expansion of the part 23 is provided. In the case of the embodiment, as shown in FIGS. 2 and 5, the expansion shielding part 22 is a partition part 44, 45, 46 that partitions the main expansion part 23, the front side secondary expansion part 24, and the rear side secondary expansion part 25. , 47 and the thickness regulating portion 48 except for a small region, the expansion gas G is caused to flow into the interior to expand substantially over the entire surface.

  In the case of the embodiment, the bag main body 21 uses two coated cloths obtained by applying a coating agent for preventing gas leakage to the surface of a woven cloth formed by weaving polyamide yarn, polyester yarn or the like, using suture threads. Manufactured by sewing. 2 to 4, the bag main body 21 is separated from the inflator 14 by separating the vehicle inner wall portion 27 a located on the vehicle inner side I and the vehicle outer wall portion 27 b located on the vehicle outer side O when the inflation is completed. The gas inflow part 27 expand | swells by making the expansion gas G flow into the inside, and the non-inflow part 40 which does not allow the expansion gas to flow in.

  As shown in FIG. 2, the gas inflow portion 27 includes a gas guide channel 28, a connection port portion 29, a front seat protection portion 30, and a rear seat protection portion that constitute the main expansion portion 23 in the expansion shielding portion 22. 31, a front side sub-expansion portion 24, a rear side sub-expansion portion 25, and communication portions 35, 36, and 37 that communicate the main expansion portion 23 with the front side sub-expansion portion 24 and the rear side sub-expansion portion 25. Configured.

  The gas guide channel 28 is disposed on the upper edge 22 a side of the expansion shielding portion 22 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 23. The gas guide channel 28 guides the inflation gas G discharged from the inflator 14 to the front seat protection unit 30 and the rear seat protection unit 31 disposed below the gas guide channel 28. It is configured. In the case of the embodiment, the connection port portion 29 connected to the inflator 14 is located at a position slightly displaced forward from the front and rear center of the gas guide channel 28 (substantially the center before and after the expansion shielding portion 22). It communicates with the passage 28 and is disposed so as to protrude upward from the gas guide passage 28. In the case of the embodiment, the connection port portion 29 is formed so as to be inclined rearwardly with respect to the gas guide channel 28, and the rear end 29a side is opened so that the inflator 14 can be inserted. And the connection port part 29 will be connected with the inflator 14 by fitting the clamp 15 in the outer peripheral side in the state which inserted the inflator 14 inside.

  As shown in FIG. 7, the front seat protection unit 30 is disposed on the side of the front seat when the inflation is completed, and when the airbag 20 (bag body 21) completes the inflation in a side collision. This is a part for protecting the head of an occupant seated in the front seat. The rear seat protection unit 31 is disposed on the side of the rear seat when the inflation is completed, and the passenger seated in the rear seat when the airbag 20 (bag main body 21) completes the inflation in a side collision. This is a part for protecting the head of the child.

  The front side sub-inflatable portion 24 is disposed on the front end 21a side of the bag body 21 so as to be adjacent to the front side of the main inflatable portion 23 (front seat protection portion 30). The front side secondary inflating portion 24 arranged on the 21a side constitutes an end side inflating portion 33. In the case of the embodiment, as shown in FIGS. 2 and 4, the front side sub-expansion portion 24 has an expansion completion shape that is substantially a bar shape substantially along the vertical direction, and is adjacent to the rear side by the partition portion 44. The gas guide channel 28 is communicated with a communication portion 35 that is partitioned from the front seat protection portion 30 and is opened to the rear upper end side. The communication portion 35 is configured to have a smaller opening width dimension and to delay the start of inflow of the inflation gas than the front seat protection portion 30.

  As shown in FIG. 2, the rear sub-inflating portion 25 fills a region below the gas guide channel 28 between the front seat protecting portion 30 and the rear seat protecting portion 31 in the main inflating portion 23. So that it is arranged. In the case of the embodiment, the rear sub-inflating portion 25 is communicated with the rear seat protecting portion 31 by two communicating portions 36 and 37 that are opened to the front upper end side and the rear lower end side. Similar to the communication portion 35, these communication portions 36 and 37 are also configured so that the opening width dimension is set smaller and the start of inflow of the inflation gas is delayed than the rear seat protection portion 31.

  In the bag main body 21 of the embodiment, the front side secondary inflating part 24 constitutes an end side inflating part 33 disposed on the front end 21 a side of the bag main body 21, and the gas inflow part 27 has a part other than the end side inflating part 33. The general expansion part 34 is configured. The end-side inflating portion 33 is partitioned from the front seat protecting portion 30 constituting the general inflating portion 34 by a partitioning portion 44 formed substantially along the vertical direction. Specifically, the partition 44 is formed so as to extend upward from the lower edge 41 b of the peripheral edge 41, as will be described later, and the end-side inflating portion 33 has the upper end 33 a on the front side via the communication portion 35. The seat protection part 30 communicates with the front seat protection part 30 by the partition part 44 toward the lower end 33b except for the upper end 33a.

  The non-inflow part 40 is disposed in the region of the gas inflow part 27, a peripheral part 41 constituting the outer peripheral edge of the gas inflow part 27, a mounting part 42 for attaching the bag body 21 (airbag 20) to the inner panel 2. Partition sections 44, 45, 46, 47 and a thickness regulating section 48. In the case of the embodiment, the peripheral edge portion 41, the partition portions 44, 45, 46, 47, and the thickness regulating portion 48 are sewn to the vehicle inner side wall portion 27a and the vehicle outer side wall portion 27b using a suture thread. Although comprised from the stitching | suture site | part, although not shown in figure, the sealing agent which prevents the gas leak from a seam is apply | coated to this stitching site | part over the perimeter.

  The peripheral edge portion 41 is arranged so as to surround the periphery of the gas inflow portion 27 over the entire circumference except for the rear end 29 a side of the connection port portion 29. The attachment part 42 is a part for attaching the upper edge 22a side of the expansion shielding part 22 to the inner panel 2 on the body 1 side of the vehicle V, and there are a plurality of attachment parts along the front-rear direction (5 in the case of the embodiment). Has been placed. Each attachment portion 42 is formed with an attachment hole (not shown) through which the bolt 12 can be inserted.

  The partition portion 44 is configured as a substantially rod shape that extends upward from a portion of the peripheral edge portion 41 on the lower edge 41b side so as to partition the front sub-inflatable portion 24 and the front seat protection portion 30. The partition portion 44 is formed by bending the front end portion 44a so as to protrude rearward from a horizontal bar portion 46a of the partition portion 46 described later (see FIG. 2). The partition 45 has a substantially rod-like shape extending upward from a portion on the lower edge 41b side in the peripheral edge 41 so as to partition the lower end side regions of the front seat protection unit 30 and the rear side sub-expansion unit 25. 45a is bent so as to be directed forward. The partition portion 46 constitutes the lower edge side of the gas guide channel 28, and partitions the rear side sub-expansion portion 25 from the gas guide channel 28 and the rear seat protection portion 31, and extends along the front-rear direction. It is comprised as a substantially reverse L-shape provided with the horizontal bar part 46a and the vertical bar part 46c extended below from the rear-end side of the horizontal bar part 46a. The horizontal bar portion 46 a constitutes the lower edge side of the gas guide channel 28. On the front end side of the horizontal bar portion 46a, a circular section configured to be bent so that the outer shape is substantially elliptical and the tip is directed rearward and downward so as to regulate the thickness of the front seat protection portion 30. A portion 46b is formed. In the airbag 20 according to the embodiment, the gap between the circular partition portion 46b of the horizontal bar portion 46a and the tip portion 45a of the partition portion 45 is connected to the front upper end side of the rear sub-inflation portion 25. The part 36 is configured. The vertical bar portion 46c is a portion that partitions the rear side sub-inflating portion 25 and the rear seat protection portion 31 and is configured so that the front end portion 46d is slightly directed forward. In the airbag 20 of the embodiment, the communication portion in which the gap between the tip end portion 46d of the vertical rod portion 46c and the lower edge 41b side of the peripheral edge portion 41 is disposed on the rear lower end side of the rear side sub-inflation portion 25. 37 is configured.

  The partition 47 is located in the vicinity of the front end of the front seat protection section 30 in front of the partition 46, and the lower end side of the tip 47 a is from the horizontal bar 46 a constituting the lower edge side of the gas guide channel 28. It is formed so as to close the front end side of the gas guide channel 28 so as to be positioned below, and as a substantially rod shape inclined so as to extend from the upper edge side portion in the peripheral edge portion 41 toward the front lower side, It is configured. The front end portion 47 a of the partition portion 47 is configured as a substantially oval shape that is inclined so that the front side is directed upward, and is disposed adjacent to the rear side of the front end portion 44 a of the partition portion 44. And in the airbag 20 of embodiment, the clearance gap between the front-end | tip parts 44a and 47a in these division parts 44 and 47 comprises the communication part 35 arrange | positioned at the rear upper end side of the front side secondary expansion part 24. FIG. The thickness restricting portion 48 is formed so as to protrude rearward and upward from a portion on the lower edge 41b side of the peripheral edge portion 41 on the lower edge side that is substantially the center in the front and rear of the front seat protecting portion 30.

  The tension belt 51 extends from the bag main body 21 and is a portion away from the lower edge of the bag main body 21. Specifically, in the embodiment, from the intermediate portion in the vertical direction of the bag main body 21, It is formed so as to extend substantially along the front-rear direction. In the case of the embodiment, the tension belt 51 is composed of a flexible belt-like body as a separate body from the bag body 21. Specifically, the tension belt 51 is formed of a woven fabric made of polyamide yarn, polyester yarn, or the like. As shown in FIGS. And the front end (front end 51a) side is fixed to the body 1 side of the vehicle V on the front edge side of the window W1 away from the front end 21a of the bag body 21, and when the airbag 20 is completely inflated, (See FIG. 7). In the case of the embodiment, the tension belt 51 has a base portion (on the rear end 51b side) at the front edge 41a side portion of the peripheral edge portion 41 that is the front side of the front side sub-inflatable portion 24 (end-side inflatable portion 33). 21 is arranged so as to extend forward by being sewn (coupled) using a suture thread at a position slightly below the center of the top and bottom, which is an intermediate portion of 21 in the vertical direction (see FIG. 2). An attachment portion 52 that is attached and fixed to the body 1 side of the vehicle V is formed on the front end (front end 51a) side of the tension belt 51. The attachment portion 52 is attached and fixed to the inner panel 2 on the body 1 side of the vehicle V using the attachment bracket 11 and the bolt 12, similarly to the attachment portion 42 of the bag body 21 (see FIG. 1, 8).

  The support member 54 is composed of a flexible sheet body. In the case of the embodiment, the support member 54 is composed of a woven fabric made of polyamide yarn, polyester yarn, or the like. As shown in FIGS. 4, 8, and 9, the support member 54 is disposed on the vehicle outer side O of the end side inflating portion 33 (the front side inflating portion 24) when the bag body 21 is completely inflated. In this case, the tension belt 51 is disposed in a region extending from the vehicle outer side O to the lower side. Specifically, the support member 54 has a substantially right-angled triangular outer shape, and the upper edge 54a is arranged in a position substantially coincident with the upper edge of the tension belt 51 in the vehicle interior and exterior direction. The rear edge 54b is disposed substantially along the vertical direction, and the lower edge 54d is disposed so as to be inclined forwardly toward the front. The support member 54 is configured to substantially match the lower end 54c on the rear edge 54b side with the lower edge 22b of the expansion shielding portion 22 in the bag body 21, and is disposed substantially along the vertical direction. The edge 54b (original side edge) side is continuously sewn to the part 44 of the bag body 21 with a suture thread over substantially the entire upper and lower regions. As shown in FIG. 8, on the front end 54e (tip) side of the tension belt, it is fixedly attached to a mounting seat 2a (see FIG. 8) as a fixing portion in the inner panel 2 on the body 1 side together with the mounting portion 52 of the tension belt 51. A mounting portion 55 is formed. The attachment portion 55 is formed so as to protrude upward from the upper edge 54 a of the support member 54. That is, the support member 54 is disposed only in a region below the attachment portion 55.

  The support member 54 has a width dimension in the front-rear direction (a separation distance from the attachment portion 55 to the stitched portion 56 where the rear edge 54b side is sewn to the partition portion 44) L1 (see FIG. 5), and the support member 54 The air bag 20 is set to be substantially the same as the separation distance L2 (see FIG. 5) from the attaching portion 52 of the tension belt 51 to the stitched portion 56 formed in the partitioning portion 44 when the airbag 20 is inflated without being attached. When the expansion of the bag 20 is completed, a tension T2 (see FIG. 3) can be generated along the front-rear direction. In detail, in the case of the embodiment, as shown in FIG. 6, the support member 54 folds the support member base material 58 in a shape that is connected at the tip end side and the upper edge side of the mounting portion 55. And it is configured as a four-ply shape.

  In the airbag 20 of the embodiment, the front seat protection part 30, the rear seat protection part 31, the front side secondary inflation part 24, and the rear side secondary inflation part 25 are not inflated when the inflation is completed when the vehicle is mounted. From the state of FIG. 2, the width dimension in the front-rear direction is expanded to reduce the width between the attachment portion 52 formed on the tension belt 51 and the attachment portion 42B disposed on the rear end side of the bag body 21. As shown in FIG. 7, a tension T1 substantially along the front-rear direction is generated. Further, in the airbag 20 of the embodiment, the support member 54 has the mounting portion 55 on the front end 54 e side, together with the mounting portion 52 of the tension belt 51, as a mounting seat as a fixing portion in the inner panel 2 on the body 1 side of the vehicle V. Since it is fixed to 2a, a tension T2 substantially along the front-rear direction is also generated in the support member 54 itself (see FIG. 3).

  Next, mounting of the head protection airbag device M of the embodiment on the vehicle V will be described. The bag body 21 in a state in which the support member 54 and the tension belt 51 are sewn in advance and the vehicle inner wall portion 27a and the vehicle outer wall portion 27b are overlapped and flattened, the lower edge 22b side to the upper edge 22a side. The support member 54 is folded together so that the airbag 20 is brought close to the airbag 20. After the folding of the airbag 20 is completed, a predetermined portion of the airbag 20 is wrapped with a wrapping material (not shown) for preventing collapse.

  Thereafter, the inflator 14 to which the mounting bracket 16 has been attached is connected to the connection port 29 of the airbag 20 by using the clamp 15, the mounting portion 52 of the tension belt 51, the mounting portion 55 of the support member 54, and the bag. The mounting bracket 11 is fixed to each mounting portion 42 of the main body 21 to form an airbag assembly.

  Next, the mounting brackets 11 and 16 are arranged at predetermined positions on the inner panel 2 on the body 1 side, are fastened with bolts 12 and 17, and lead wires (not shown) extending from a predetermined control device for inflator operation are connected to the inflator 14. If the front pillar garnish 4 and the roof head lining 5 are attached to the inner panel 2 on the body 1 side, and the pillar garnishes 6 and 7 are attached to the inner panel 2 on the body 1 side, the head protection airbag device M is mounted on the vehicle. V can be mounted.

  Then, after the head protection airbag device M is mounted on the vehicle V, if the inflator 14 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 inflator 14 The inflation gas discharged from the air flows into the expansion shielding portion 22 of the bag body 21, and the expanding expansion shielding portion 22 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. 7, windows W <b> 1 and W <b> 2, center pillar portion CP, and rear pillar portion RP It will expand greatly to cover the inside of the car.

  In the head protection airbag device M according to the embodiment, the support member 54 that is disposed so as to cover the vehicle outer side O of the end-side inflating portion 33 (the front-side sub-inflating portion 24) when the airbag 20 is completely inflated is Since the front end 54e side, which is the side, is fixed to the mounting seat 2a of the inner panel 2 on the body 1 side of the vehicle V together with the mounting portion 52 of the tension belt 51, when the airbag 20 (bag body 21) is completely inflated. The tensions T1 and T2 are generated substantially along the front-rear direction in each of the support member 54 and the tension belt 51. Further, the support member 54 has a lower edge (lower end 54 c of the rear edge 54 b) substantially coincided with the lower edge 22 b of the bag body 21, and a rear edge (rear side) arranged substantially along the vertical direction. The edge 54b) is coupled to the partition portion 44 that partitions the end-side inflating portion 33 and the general inflating portion 34, and the lower edge 22b side of the bag body 21. In the case of the embodiment, the partition portion 44 is formed so as to extend upward from the peripheral portion 41 constituting the outer peripheral edge of the bag body 21, and therefore, the rear edge 54 b side of the support member 54 is connected to the peripheral portion from the partition portion 44. From the lower edge 41b of the part 41, it is continuously sewn at the site of the suture site 56 over substantially the entire upper and lower regions. Therefore, the support member 54 pushes the end-side inflating portion 33 toward the vehicle inside I when the expansion of the bag body 21 is completed, and moves the vehicle outer side O in the region from the tension belt 51 to the end-side inflating portion 33 to the front and rear. Since it is supported over the entire region, when the vehicle V rolls over, when the head MH of the occupant MP moving toward the vehicle outer side O comes into contact with the inflating end-side inflating portion 33, the supporting member 54 The bag body 21 can accurately support the region on the lower side of the end-side inflatable portion 33 and the outer side O of the tension belt 51 (see FIGS. 8 and 9). It can suppress exactly that it moves so that it may twist, turning the edge 22b side toward the vehicle outer side. Therefore, when the vehicle V rolls over, the movement of the head MH of the occupant MP to the further vehicle outer side O can be suppressed by the end-side inflating portion 33 that supports the vehicle outer side O on the support member 54, thereby protecting the vehicle V appropriately. be able to.

  Therefore, in the head protection airbag device M of the embodiment, when the vehicle V is rolled over, the head MH of the occupant MP that moves to the vehicle outer side O is restrained from moving to the vehicle outer side O, and is accurately protected. be able to.

  If the support member is arranged to cover the vehicle outer side and the vehicle inner side of the end side inflating part, respectively, and the front end side is fixed to the vehicle body side fixing part, respectively, The support member disposed inside the vehicle also generates a tension along the front-rear direction, but the support member disposed inside the vehicle pushes the end-side inflating portion outward. . For this reason, the support member disposed on the vehicle interior side is configured to cancel the support action by the support member disposed on the vehicle exterior side, and the vehicle exterior side of the end-side inflatable portion is covered by the support member disposed on the vehicle exterior side. It cannot be properly supported, and it is difficult to protect the passenger's head accurately. In the head protection airbag device M of the embodiment, since the support member 54 is disposed only on the vehicle outer side O of the end side inflating portion 33, the vehicle outer side of the end side inflating portion 33 is completed when the airbag 20 is completely inflated. O can be accurately supported, and the head MH of the occupant MP can be accurately protected.

  In particular, in the head protection airbag device M of the embodiment, the end-side inflating part 33 is configured to communicate with the general inflating part 34 only at the part on the upper end 33a side, and is the partition except for the part on the upper end 33a side. The part 44 is configured to be separated from the general inflating part 34. That is, the head protection airbag device M according to the embodiment is configured by closing the lower end 33b side of the end-side inflating portion 33. Therefore, when the airbag 20 is completely inflated, the support member 54 that has generated the tension T2 extending in the front-rear direction causes the end-side inflatable portion 33 to extend over the entire upper and lower regions as shown in FIG. Can be extruded.

  Further, in the head protecting airbag device M of the embodiment, the tension belt 51 is disposed at an intermediate portion that is lifted upward from the lower edge of the bag body 21, and the support member 54 is disposed from the vehicle outer side O of the tension belt 51. Since it is disposed only in the region extending downward (so as not to protrude upward from the tension belt 51), the amount of the support member base material 58 constituting the support member 54 can be reduced, and the manufacturing cost can be reduced. In addition, the airbag 20 can be folded in a compact manner. In particular, in the head protection airbag device M of the embodiment, the support member 54 is formed in a substantially right-angled triangular shape with the rear edge 54b side being the widest and narrowing toward the front end 54e side. The use amount of the support member base material 58 constituting 54 can be reduced as much as possible. Of course, if this point is not taken into consideration, the support member may be arranged also in a region above the tension belt.

  Furthermore, in the head protection airbag apparatus M of the embodiment, the bag body 21 is positioned above the belt line BL formed by the lower edges of the windows W1, W2 on the lower edge 22b side when the inflation is completed. Since it is configured, the volume of the bag main body 21 can be reduced, the increase in the size of the inflator 14 can be suppressed, and the entire apparatus can be made compact. Of course, in the head protection airbag device M of the embodiment, when the airbag 20 is completely inflated, the support member 54 generates the tension T2 substantially along the front-rear direction, and the end-side inflating portion 33 (front side sub-portion 33). Since the vehicle outer side O of the inflatable portion 24) is supported, the lower end 22b of the bag body 21 when the inflating is completed is not supported by a member such as a door trim that constitutes the belt line BL. When the vehicle is over, the head MH of the occupant MP moving toward the vehicle outer side O can be accurately protected.

  Further, as the airbag 20A, as shown in FIGS. 10 and 11, a support member 60 that covers the vehicle outer side O of the end side inflating portion 33A (front side inflating portion 24A) is formed in a substantially trapezoidal shape. Also good. The support member 60 used in the airbag 20A shown in FIGS. 10 and 11 has the rear edge 60a substantially along the vertical direction, and the lower edge 60b extending forward from the lower end of the rear edge 60a substantially along the front-rear direction. The rear edge 60a side and the lower edge 60b side are continuously formed over substantially the entire region, and the peripheral edge portion 41A is arranged substantially along the front-rear direction that becomes the partition portion 44A and the lower edge 22b side of the bag body 21. Are joined (sewn) to the lower edge 41b side. When the support member 60 having such a configuration is used, when the airbag 20A is completely inflated, the attachment portion 61 disposed on the front end side, the rear edge 60a side, and the lower edge 60b side are separated from the partition portion 44A to the peripheral portion 41A. As a result, tension is generated radially between the substantially L-shaped stitched portion 62 that is sewn to the end, and the outer side of the end side inflatable portion 33A can be more accurately supported by the support member 60. it can.

  In the airbags 20 and 20A of the embodiment, the end side inflating portions 33 and 33A (front side sub inflating portions 24 and 24A) and the general inflating portions 34 and 34A (front seat protecting portions 30 and 30A) are partitioned. The partition portions 44 and 44A are formed so as to extend from the lower edge 41b of the peripheral edge portions 41 and 41A, and the support members 54 and 60 have the partition portions 44 extending substantially over the entire upper and lower sides of the rear edges 54b and 60a. , 44A. However, if the support member has a configuration in which the lower end side of the rear edge is coupled to the lower edge side portion of the peripheral portion, the partition portion may be configured to be separated from the lower edge side portion of the peripheral portion. Good. In the airbags 20 and 20A of the embodiment, the tension belts 51 and 51A are configured separately from the bag main bodies 21 and 21A. However, the tension belt may be formed integrally with the bag main body.

  Further, in the embodiment, the airbag of the configuration in which the end-side inflating portion is arranged on the front end side of the bag body is described as an example, but the arrangement position of the end-side inflating portion is not limited to this, It is good also as a structure arrange | positioned at the rear-end side of a bag main body. Furthermore, in the embodiment, the airbag has a main inflating portion and a sub inflating portion that completes inflating after the main inflating portion has been inflated. Although a configuration that can protect an occupant's head at the time of rollover is used, the head protection airbag device to which the present invention can be applied is not limited to this, and the occupant's head is not limited to this when a side collision of the vehicle occurs. The present invention may be applied to an airbag device for protecting the head.

  DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Inner panel, 2a ... Mounting seat (fixed part), 9 ... Air bag cover, 11 ... Mounting bracket, 12 ... Bolt, 14 ... Inflator, 20, 20A ... Air bag, 21, 21A ... Bag body 21a ... front end, 22 ... expansion shielding part, 22a ... upper edge, 22b ... lower edge, 27 ... gas inflow part, 33, 33A ... end side expansion part, 34, 34A ... general expansion part, 40 ... non-inflow part, 41, 41A ... peripheral edge, 41b ... lower edge, 42 ... mounting part, 44, 44A ... partitioning part, 51 ... tension belt, 51a ... front end (front end), 51b ... rear end (original part), 52 ... mounting part, 54, 60 ... support member, 54b, 60a ... trailing edge, 55, 61 ... mounting portion, T1, T2 ... tension, W1, W2 ... window, V ... vehicle, M ... head protection airbag device.

Claims (5)

Folded and stored on the upper edge side of the window inside the vehicle, the upper edge side is attached and fixed to the body side of the vehicle, the inflation gas from the inflator is allowed to flow in, and the vehicle interior side of the window protrudes downward A head protection airbag device configured to include an airbag configured to be deployed and inflated so as to cover
The airbag is
A bag body that is flexible and has an upper edge side fixed to the vehicle body side on the upper edge side of the window at a plurality of locations along the front-rear direction;
A tension belt formed so as to extend from one end side in the front-rear direction of the bag body, and fixing the front end side to the vehicle body side at the periphery of the window away from the end portion of the bag body;
A support member configured to cover the vehicle exterior of the bag body when the bag body is completely inflated, and a support member configured from a flexible sheet body;
And is configured to include
An end-side inflating portion that is partitioned from other general inflating portions by a partitioning portion that is formed substantially along the up-down direction on the front-rear direction end side that becomes the tension belt side when the bag body is inflated. , And is configured to include,
The tension belt extends from the bag body, and is configured by disposing an attachment portion fixed to the peripheral edge of the window on the tip side.
The support member is disposed at a position on the vehicle outer side of the end-side inflating portion when the inflating is completed, and the lower edge is substantially aligned with the lower edge of the bag body so as to be substantially in the vertical direction on the base side. An edge along the edge is joined to the partition part and a lower edge side of the bag body, and a tip side is fixed to a fixing part on the body side of the vehicle together with the attachment part of the tension belt. A head protection airbag device characterized by the above. The tension belt is disposed at a position away from the lower edge of the bag body;
The head protection airbag device according to claim 1, wherein the support member is disposed only in a region from the vehicle outer side to the lower side of the tension belt.   2. The head according to claim 1, wherein the support member is disposed only in a region below a mounting portion that is attached to a fixed portion on the body side of the vehicle when the expansion of the bag body is completed. Part protection airbag device.   4. The school according to claim 1, wherein the support member has a lower edge side substantially along the front-rear direction coupled to a lower edge side substantially along the front-rear direction of the bag body. 5. Head protection airbag device.   The said bag main body is comprised so that the lower edge side at the time of completion of expansion may be located above the belt line comprised from the lower edge of the said window, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. The head protection airbag device according to Item.

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