JP2018030446A - Head protection airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head protection airbag device in which an airbag has a simple configuration, and suitably receive a head of an occupant.SOLUTION: A head protection airbag device M comprises a bag body 21, and a connection cloth 51 which connects the bag body 21 and a body 1. The bag body 21 comprises: a first inflation part 30; a second inflation part 32 which is so provided as to be adjacent to the first inflation part 30 and in which a membrane length, which is freely inflatable in a cross direction, is so set as to be long on the vehicle inner side and short on the vehicle outer side; and a third inflation part 33 which is provided on a side of the second inflation part 32 opposite to the first inflation part 30 in the cross direction, and which receives inflation of the second inflation part 32 at inflow time of an inflation gas and is inflated toward the vehicle outer side. The connection cloth 51 is so provided as to be capable of supporting the vehicle outer side of the third inflation part 33. In inflation completion state of an airbag 20, the second inflation part 32 is pressed toward the vehicle inner side by the third inflation part 33 supported by the connection cloth 51.SELECTED DRAWING: Figure 5

Description

  The present invention is folded and housed on the upper edge side of the window on the vehicle interior side, and the upper edge side is attached and fixed to the vehicle body side so that the inflation gas flows into the interior so as to cover the vehicle interior side of the window. The present invention relates to a head protecting airbag device including an airbag that is deployed and inflated.

  Conventionally, it is folded and stored on the upper edge side of the window inside the vehicle, and the upper edge side is attached and fixed to the body side of the vehicle, and the expansion gas is allowed to flow inside so that the inside of the window is covered. In the head protection airbag device having an inflating airbag, when the airbag is activated (at the time of a side collision or oblique collision), the membrane surface on the inner side of the inflated airbag has an R shape. When the bag receives the occupant's head, depending on the contact position, there may be a problem that the occupant's head rotates toward the outside of the vehicle toward the R-shaped portion having a concave film surface.

  By the way, there is one disclosed in Patent Documents 1 and 2 below as an airbag device in which a protruding portion inflated further inside the vehicle than the inflating portion is provided in front of the inflating portion of the airbag.

  In the following Patent Document 1, a side airbag that expands and inflates so as to cover the vehicle interior of the window, a second airbag portion (protrusion) in which the membrane length of the membrane surface on the vehicle interior is partially set long, A tether that temporarily regulates the deployment of the second airbag portion, and after deploying a separate driver seat airbag body, the tether is cut so that the second airbag portion faces the vehicle interior. The point which was made to protrude is disclosed.

  Further, in Patent Document 2 below, a sub-chamber provided on the front end side of the side-impact airbag is folded in advance to the inside of the vehicle, and the sub-chamber (projection) is inflated at a position inside the vehicle relative to the main chamber at the time of inflation and deployment. The point which it came to make is disclosed.

International Publication No. 2012/111073 International Publication No. 2015/0665272

In these patent documents, a protruding portion that is inflated further toward the inside of the vehicle than the inflating portion that protects the head of the occupant is provided, and the occupant's head that moves obliquely forward by the protruding portion is moved to the outside of the vehicle. It can be received before it rotates significantly.
However, in the airbag device described in Patent Document 1, it is difficult to stably cut the tether at a constant timing, and the timing at which the second airbag portion starts to inflate is likely to vary.
In the airbag apparatus described in Patent Document 2, the reaction force is obtained by supporting the sub-chamber that protrudes toward the inside of the vehicle with the airbag for the driver's seat separate from the airbag for side collision. Because it is a structure that catches the occupant's head, the two types of airbags must be operated in coordination, making the structure complicated, and taking into account the timing shift that occurs during operation, the occupant's head should be firmly received The question remains about reliability.

  In view of the above circumstances, an object of the present invention is to provide a head protection airbag device that can appropriately receive the head of an occupant with a simple configuration of the airbag.

A head protection airbag device according to the present invention is folded and housed on the upper edge side of a window inside a vehicle, and the upper edge side is attached and fixed to the body side of the vehicle so that an inflation gas flows into the inside. A head protection airbag device comprising an airbag that expands and inflates to cover the vehicle interior of the window,
The airbag is
The bag body,
The bag body is a separate and flexible band-shaped body, and includes a connecting cloth that connects the bag body and the body,
The bag body is
A first inflatable portion disposed on the side of the seating position of the occupant;
A second inflating portion that is provided adjacent to the front-rear direction of the first inflating portion, and has a membrane length that is freely expandable in the front-rear direction, which is set longer on the vehicle inner side and shorter on the vehicle outer side;
The second expansion portion is provided on the opposite side of the first expansion portion in the front-rear direction, adjacent to the second expansion portion, and receives the expansion of the second expansion portion when the expansion gas flows in. A third inflatable portion that is intended to expand toward the outside,
The connecting cloth is disposed so as to be able to support the vehicle exterior side of the third inflating portion, one end is on the bag main body on the first inflating portion side with respect to the third inflating portion, and the other end is on the body side, Each is attached,
The second inflating portion is configured to be pressed toward the vehicle inner side by the third inflating portion supported by the connecting cloth in a state where the inflating of the airbag in a vehicle mounted state is completed. Features.

  In the head protecting airbag device according to the present invention, the first inflating portion, the second inflating portion, and the third inflating portion are arranged side by side in the front-rear direction. The film length in the front-rear direction of the second inflating portion provided adjacent to the first inflating portion is set to be long on the inside of the vehicle and short on the outside of the vehicle, and the inflating gas is introduced into the airbag. When the second inflating portion changes its shape based on the difference in film length, the third inflating portion expands toward the vehicle outer side under the expansion of the second inflating portion.

  On the other hand, a connecting cloth is disposed on the vehicle exterior side of the third inflating portion. When tension is generated in the connecting cloth in the inflated and deployed state of the airbag mounted on the vehicle, the third inflating portion is supported by the connecting cloth. And pushed inside the car. And since the 2nd expansion part adjacent to the 3rd expansion part is also pushed out to the vehicle inside by this 3rd expansion part, in the present invention, it is made to project the 2nd expansion part to the vehicle inside rather than the 1st expansion part. it can.

  Thus, the head protection airbag device of the present invention has a simple configuration of the airbag, specifically, the first inflatable portion, the second inflatable portion, and the third inflatable portion are juxtaposed in the front-rear direction, The second inflatable portion is provided with a difference in film length and a connecting cloth is disposed on the vehicle outer side of the third inflatable portion to be inflated toward the vehicle outer side. The occupant's head can be received and protected without being rotated by the second inflating part before it is greatly rotated to the outside of the vehicle.

  Therefore, according to the present invention, it is possible to provide a head protection airbag device that can appropriately receive the head of an occupant with a simple configuration of the airbag.

In the head protection airbag device of the present invention, a structure that allows the second inflatable portion to be pushed to the inside of the vehicle relative to the first inflatable portion can be applied to the front seat side, and can also be applied to the rear seat side. Is also possible. When applied to the front seat side, the second inflating portion and the third inflating portion can be provided on the end side in the front-rear direction of the bag body.
On the other hand, when applied to the rear seat side, the second inflating portion and the third inflating portion can be provided on the central portion side separated from the longitudinal end portion of the bag body.

In the head protection airbag device of the present invention, the other end of the connecting cloth can be attached and fixed to the pillar portion on the peripheral edge of the window. In this case, the number of components can be reduced by using a conventionally used tension belt as a connecting cloth.
In the head protection airbag device of the present invention, the other end of the connecting cloth can be attached and fixed to the roof side rail portion on the upper edge side of the window.

It is the schematic front view which looked at the head protection airbag apparatus which is one Embodiment of this invention from the vehicle inside. It is a front view shown in the state where the air bag used with the head protection air bag device of the embodiment was developed flat. FIG. 3 is a transverse sectional view showing a state where the airbag of FIG. 2 is freely inflated as a single unit, and shows a III-III portion of FIG. It is an effect explanatory view at the time of completion of expansion in the embodiment. In the head protection airbag apparatus of the embodiment, it is a schematic sectional view along the front-rear direction showing a state in which the airbag has been inflated. It is the figure which showed the front expansion part of the airbag used by other embodiment of this invention. FIG. 7 is a cross-sectional view showing a state in which the airbag of FIG. 6 is freely inflated alone, and shows a portion corresponding to the III-III portion of FIG. 2. It is an effect explanatory view at the time of completion of expansion in the embodiment. FIG. 10 is a partial front view showing a state where a rear inflating portion of an airbag according to still another embodiment of the present invention is flatly deployed. FIG. 10 is a cross-sectional view showing a state where the airbag of FIG. 9 is freely inflated as a single unit, and shows a portion XX of FIG. It is an effect explanatory view at the time of completion of expansion in the embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the head protecting airbag device M of the present embodiment is mounted on a two-row seat type vehicle V having two windows (side windows) W1 and W2. The head protecting airbag device M according to the present 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 5, the airbag cover 9 has lower edges of the front pillar garnish 4 disposed on the front pillar portion FP and the roof head lining 5 disposed on the roof side rail portion RR. Is made up of. The front pillar garnish 4 and the roof head lining 5 are made of synthetic resin and are fixedly attached to the inner side of the inner panel 2 on the body 1 (vehicle body) side in the front pillar portion FP and the roof side rail portion RR, respectively. ing. The airbag cover 9 is pushed and opened by the airbag 20 so as to cover the inner side of the airbag 20 that is folded and stored so that the airbag 20 can be protruded toward the inner side when deployed. It is configured to be possible (see FIG. 5).

  The inflator 14 supplies inflation gas to the airbag 20, and as shown in FIG. 1, a gas cylinder (not shown) capable of discharging inflation gas to the tip side as a cylinder type whose outer shape is substantially cylindrical. A discharge port is provided. The inflator 14 inserts the front end side including the vicinity of the gas discharge port into a connection port portion 29 (to be described later) of the airbag 20, and uses the clamp 15 disposed on the outer peripheral side of the rear end of the connection port portion 29. It is connected to the bag 20. Further, as shown in FIG. 1, the inflator 14 uses a mounting bracket 16 that holds the inflator 14 and a bolt 17 for fixing the mounting bracket 16 to the inner panel 2 on the body (vehicle body) 1 side. The inner panel 2 is attached at a position above the window W2. The inflator 14 is electrically connected to a control device (not shown) of the vehicle V via a lead wire (not shown), and when the control device detects a side collision, oblique projection, or rollover of the vehicle V, An operation signal from the control device is input to operate.

  The mounting bracket 11 is composed of two sheet metal plates, and is attached to the mounting portions 42 and 52 so as to sandwich the mounting portions 42 and 52 (to be described later) of the airbag 20, and uses the bolts 12. Thus, the attachment portions 42 and 52 are attached and fixed to the inner panel 2 on the body 1 side (see FIGS. 1 and 5).

  As shown in FIGS. 2 to 4, 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 present embodiment, the front end 21 a side), a bag body 21 and tethers 54 and 55 for restricting the expansion completion shape of the bag main body 21.

  As shown in FIGS. 1 and 2, the bag body 21 includes an expansion shield 22 disposed so as to cover the vehicle interior side of the windows W1 and W2 when the expansion is completed, and the upper edge 22b side of the expansion shield 22 on the body 1 side. And a plurality of attachment portions 42 attached to the inner panel 2. The expansion shielding part 22 can cover the vehicle interior from the window W1 to the front side of the rear pillar part RP through the center pillar part CP and the window W2 when the expansion of the bag body 21 is completed. It is made into the substantially rectangular plate shape substantially along the direction.

  In the case of this embodiment, the expansion shielding part 22 includes a front expansion part 23 and a rear expansion part 24 that are expanded by inflowing an expansion gas G discharged from the inflator 14, as shown in FIGS. . Specifically, as the front inflating portion 23, a first inflating portion 30 as a main inflating portion on the front seat side disposed on the side of the seating position of the front seat occupant and adjacent to the front side of the first inflating portion 30. A rear inflating portion 32 and a third inflating portion 33 as the auxiliary inflating portion provided, and the rear inflating portion 24 is disposed at the side of the seating position of the rear seat occupant as the main inflating portion And a sub-expansion portion 39 provided adjacent to the front side of the main expansion portion 38.

  The bag body 21 is configured to be foldable, and as shown in FIGS. 2 to 4, as shown in FIGS. It is comprised as a sewing bag formed by sewing the part 27b. In the airbag 20 of the present embodiment, a sealing material is applied to the joint portion 43 in which the vehicle inner wall portion 27a and the vehicle outer wall portion 27b are sewn so as to improve airtightness.

  2 to 4, the bag main body 21 is provided with a gas inflow portion 27 that inflates so as to separate the vehicle inner wall portion 27 a and the vehicle outer wall portion 27 b facing each other by flowing in the inflation gas G. The vehicle interior side wall portion 27a and the vehicle exterior wall portion 27b are configured to include a non-inflow portion 40 that does not allow the inflation gas G to flow in.

  The non-inflow portion 40 includes a coupling portion 43, a peripheral edge portion 41 around the coupling portion 43, and an attachment portion 42 on the upper edge 21 b side of the bag body 21, in other words, the peripheral edge portion 41. Yes.

  The peripheral edge portion 41 constitutes the outer peripheral edge of the bag body 21 and is formed so as to surround the peripheral edge of the gas inflow portion 27 over the entire periphery 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 22b side of the expansion shielding part 22 to the inner panel 2 on the body 1 side of the vehicle V. A plurality of attachment parts 42 (four in the case of this embodiment) are provided along the front-rear direction. ) Is formed. Each attachment portion 42 is formed with an attachment hole (not shown) through which the bolt 12 can be inserted.

  The coupling portion 43 is disposed so as to partition the periphery of the gas inflow portion 27 and to partition an internal region in the gas inflow portion 27, and includes partition portions 44 and 45.

  The partition 44 provided substantially at the center partitions the front and rear front expansion parts 23 and the rear expansion part 24 (specifically, the first expansion part 30 for the front seat and the sub expansion part 39 for the rear seat). It is a thing provided with the substantially T-shaped vertical division part 44a and the horizontal division part 44b. Between the horizontal partition 44b and the upper edge 41b of the peripheral edge 41, a gas guide channel 28 that communicates the front and rear front expansion parts 23 and the rear expansion part 24 is formed. On the other hand, the rear partitioning portion 45 is disposed so as to extend upward from the coupling portion 43 on the lower edge side of the rear expansion portion 24 so as to partition the main expansion portion 38 and the sub expansion portion 39 of the rear expansion portion 24. Has been.

  On the other hand, tethers 54 and 55 that divide the inner region are disposed in the front expansion portion 23 on the front side of the gas inflow portion 27. The tethers 54 and 55 are separate from the bag body 21 and are formed of a flexible belt-like body, and are formed of a woven fabric made of polyamide yarn or polyester yarn.

  As shown in FIG. 3, the tether 54 is fully inflated by sewing one end 54a on the vehicle interior side to the vehicle interior side wall portion 27a and the other end 54b on the vehicle exterior side to the vehicle exterior wall portion 27b, respectively, at the stitched portion 48. The partition part 46 extended in an up-down direction is comprised in the state, and the inner area | region of the front expansion part 23 is divided into the 1st expansion part 30 as a main expansion part, and the 2nd expansion part 32 as a sub expansion part. .

  The tether 55 disposed on the front end side (left side in the figure) of the tether 54 also has a stitched portion 48 with one end 55a on the inner side of the vehicle on the side wall 27a and the other end 55b on the outer side with the side wall 27b. A partition portion 47 that extends in the up-down direction when the expansion is completed is configured, and an inner region of the front expansion portion 23 is partitioned into a second expansion portion 32 and a third expansion portion 33.

  The gas inflow portion 27 includes a gas guide channel 28, a connection port portion 29, a first inflatable portion 30 for the front seat, and a second inflatable portion 32 and a third inflatable portion 33 provided on the front side of the first inflatable portion 30. And a main inflating portion 38 for the rear seat, and a sub inflating portion 39 provided on the front side of the main inflating portion 38.

  The gas guide channel 28 is disposed on the upper edge 22b side of the expansion shielding part 22 in a substantially rod shape extending substantially along the front-rear direction. The gas guide channel 28 guides the expansion gas G discharged from the inflator 14 to the main expansion portion 30 for the front seat and the main expansion portion 38 for the rear seat disposed below the gas guide flow channel 28. It is configured to do so. In the case of the present embodiment, the connection port portion 29 connected to the inflator 14 is located at a position slightly displaced forward from the approximate center before and after the gas guide channel 28 (approximately the center before and after the expansion shielding portion 22). It communicates with the guide channel 28 and is disposed so as to protrude upward from the gas guide channel 28. In the case of the present 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.

  The first inflatable portion 30 for the front seat is disposed on the side of the seating position of the front seat occupant when the inflation is completed, and when the airbag 20 (bag body 21) completes the inflation in the side collision. In addition, it is a part for protecting the head of an occupant seated in the front seat. The first inflatable portion 30 is configured by a region surrounded by the vehicle interior side wall portion 27 a, the vehicle exterior wall portion 27 b, and the tether 54.

  The second inflating portion 32 is disposed on the front end 21 a side of the bag body 21 so as to be adjacent to the front side of the first inflating portion 30. The second inflating portion 32 is configured by a region surrounded by the vehicle inner wall portion 27a, the vehicle outer wall portion 27b, and the tethers 54 and 55. Further, openings are provided on the upper ends of the tethers 54 and 55, respectively, and communication portions 56 and 57 that communicate with the gas guide channel 28 are formed. As will be described later, the second inflating portion 32 is pushed out from the first inflating portion 30 to the vehicle inner side when the inflating is completed, thereby protecting the head of the occupant.

  In the second inflatable portion 32, the wall portion 32a of the vehicle inner side I (vehicle inner side wall portion 27a) and the wall portion of the vehicle outer side O (vehicle outer side wall portion 27b) in the second inflatable portion 32 respectively defined by the tethers 54 and 55. 32b, as shown in FIG. 3, the length of the membrane that can freely expand in the front-rear direction is longer at the wall portion 32a on the vehicle inner side I and shorter at the wall portion 32b on the vehicle outer side O. Further, the positions of the tethers 54 and 55 in the front-rear direction are set. For this reason, in this embodiment, based on the film length difference in the free expansion state, the wall portion 32a on the vehicle inner side extends longer in the front-rear direction, and the tether 55 located on the opposite side to the first expansion portion 30 is provided. Turn to the outside O (see Fig. 3).

  As shown in FIG. 3, the third inflating portion 33 is on the opposite side of the second inflating portion 32 from the first inflating portion 30 in the front-rear direction (that is, the front end side of the bag body 21). It is provided adjacent to the vehicle outer side O. The third inflating portion 33 is configured by a region surrounded by a vehicle inner side wall portion 27a, a vehicle outer side wall portion 27b, and a tether 55 having end portions coupled to the wall portions 27a and 27b. The third inflating portion 33 is connected to the second inflating portion 32 through the tether 55, and is in a free inflating state in which the airbag 20 is not attached to the vehicle. Since the second expansion portion 32 faces the vehicle outer side O based on the film length difference of the second expansion portion 32, the third expansion portion 33 that follows this expands toward the vehicle outer side O.

  The main inflating portion 38 for the rear seat is arranged at the side of the seating position of the occupant in the rear seat when the inflation is completed, and when the airbag 20 (bag body 21) completes the inflation in the side collision. This is a part for protecting the head of an occupant seated in the rear seat.

  More specifically, the rear seat sub-expansion portion 39 is adjacent to the front side of the rear seat main expansion portion 38, in detail, between the front seat first expansion portion 30 and the rear seat main expansion portion 38. Is arranged. The sub inflating portion 39 is communicated with the main inflating portion 38 for the rear seat by a communicating portion 58 opened to the rear upper end side.

  The tension belt 51 is composed of a belt-like body having flexibility. In the case of this embodiment, the tension belt 51 is composed of a woven fabric made of polyamide yarn, polyester yarn or the like, and is disposed on the vehicle outer side O of the third inflating portion 33 as shown in FIGS. The base portion (rear end 51b) side is coupled to the position of the first inflatable portion 30 side of the bag main body 21 from the third inflatable portion 33 (in this example, the stitched portion 48 that is sewn together with the tether 55), and The front end (front end 51a) side is fixed to the body 1 side of the vehicle V (see FIG. 1). On the front end 51a side of the tension belt 51, an attachment portion 52 that is attached and fixed to the body 1 side of the vehicle V is formed. Similar to the attachment portion 42 of the bag body 21, the attachment portion 52 is attached and fixed to the inner panel 2 on the body 1 side of the vehicle V at the front pillar portion FP using the attachment bracket 11 and the bolt 12. (See FIGS. 1 and 5).

  In the airbag 20 of the present embodiment, when the inflation is completed when the vehicle is mounted, the front inflation portion 23 and the rear inflation portion 24 are inflated so as to reduce the width dimension in the front-rear direction from the non-inflation state. Between a mounting portion 52 formed on the belt 51 and a mounting portion 42B (see FIG. 2) disposed on the rear end side of the bag main body 21, a tension T (FIGS. 2 and 4) substantially along the front-rear direction. Will be generated). As will be described later, in the present embodiment, the third inflating portion 33 and the second inflating portion 32 are pushed out to the inside of the vehicle by using the tension T.

  Next, the mounting of the head protection airbag device M of this embodiment on the vehicle V will be described. The bag body 21 in a state in which the tethers 54 and 55 and the tension belt 51 are sewn and the vehicle inner side wall portion 27a and the vehicle outer side wall portion 27b are overlapped and flattened is spread, and the lower edge 22c side is set to the upper edge 22b side. It folds so that it may approach, and the airbag 20 is folded. 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 using the clamp 15, and the attachment portion 52 of the tension belt 51 and each attachment portion 42 of the bag body 21 are connected to each other. Then, the mounting bracket 11 is fixed 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.

  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, oblique collision, or rollover of the vehicle V, The inflation gas discharged from the inflator 14 flows into the expansion shielding part 22 of the bag body 21, and the expansion shielding part 22 that expands breaks the wrapping material (not shown), and further, the front pillar garnish 4 and the roof As shown by a two-dot chain line in FIG. 1, the airbag cover 9 constituted by the lower edge of the head lining 5 is pushed open and protrudes downward. As shown by the two-dot chain line in FIG. 1, the windows W1, W2, the center pillar portion CP, and the rear pillar portion RP It will expand greatly to cover the inside of the car.

  In the head protecting airbag device M of the present embodiment, the tension belt 51 receives the inflation of the second inflating part when the inflating gas flows in, and the vehicle of the third inflating part 33 that tends to inflate toward the vehicle outer side O. Arranged on the outer side O. Therefore, in the head protection airbag device M of this embodiment, when the tension T along the front-rear direction is generated in the tension belt 51 itself when the airbag 20 in the vehicle-mounted state is completely inflated, the tension belt 51 causes the first 3 expansion part 33 will be pushed out to vehicle inside I (refer to Drawing 4). At this time, the third inflating portion 33 and the second inflating portion 32 have portions overlapping each other in the vehicle interior / exterior direction, and the second inflating portion 32 is also pushed out to the vehicle inside I by the third inflating portion 33. .

  And according to this embodiment, the 2nd expansion part 32 adjacent to the front side of the 1st expansion part 30 can be made to protrude in the vehicle inside I rather than the 1st expansion part 30. FIG. Further, in the present embodiment, the second inflating portion 32 is supported from the outside of the vehicle by the tension belt 51 and the third inflating portion 33. According to the present embodiment, as shown in FIG. Occasionally, the second inflating portion 32 moves the head MH of the occupant who is moving forward along the R shape of the inboard side wall portion 27a of the first inflating portion 30 while rotating forwardly (in the direction of arrow R in the figure). It can be received and protected appropriately.

  As described above, the head protection airbag device M according to the present embodiment has the airbag 20 with a simple configuration. Specifically, the first inflation portion 30, the second inflation portion 32, and the third inflation portion 33 are arranged in the front-rear direction. The second inflatable portion 32 is provided with a film length difference, and a tension belt 51 is disposed on the vehicle outer side of the third inflatable portion 33 to be inflated toward the vehicle outer side O. The inflatable portion 32 can be protruded to the vehicle inner side I from the first inflatable portion 30, and the occupant's head MH can be received and protected by the second inflatable portion 32 before rotating greatly toward the vehicle outer side. .

  In the present embodiment, the number of components can be reduced by using the tension belt 51 as a connecting cloth for pushing the third inflating portion 33 to the vehicle interior side I.

  6 to 8 show other embodiments of the present invention. In this embodiment, instead of providing a tether in the inner region of the front inflating portion 23, the base fabric forming the second inflating portion 32 is stitched together to restrict free expansion in the wall portion 32b on the outside O, thereby The bag body 21B of the airbag 20B is formed of a bag weave, and the first inflatable portion 30, the second inflatable portion 32, and the third inflatable portion 33 are closed. The point divided by the part 64 is different from the first embodiment. Other configurations are the same as those in the first embodiment.

  FIG. 6 is an enlarged view of the front expansion portion 23 that is a main portion of the present embodiment. In this example, the portion forming the second inflating portion 32 is folded back to the vehicle interior side I of the third inflating portion 33, and the respective closing portions 64 partitioning the inflating portions 30, 32, 33 are overlapped in the thickness direction. In this state, the stitches are stitched together at the stitched portion 63. In the present embodiment, the tension belt 51 is disposed on the vehicle outer side O of the third inflating portion 33 as in the first embodiment, and the base portion (rear end 51b) side of the bag main body 21B is disposed on the base portion (rear end 51b) side. It is combined with a position (a suture site 63 in this example) closer to the first inflating part 30 than the third inflating part 33.

  According to the present embodiment, the wall portion 32a on the vehicle interior side I of the second inflating portion 32 is located outside the region where the inflating gas is introduced, so that it can be inflated in the front-rear direction. Expansion in the front-rear direction is limited with respect to the wall portion 32b on the vehicle exterior O located inside the region where the expansion gas is introduced in the folded state. As a result, when the wall portion 32a on the vehicle interior side of the second expansion portion 32 expands in a natural expansion state, as shown in FIG. 7, the first expansion portion 30 of the second expansion portion 32 is opposite to the front-rear direction. (That is, the front end side of the bag body 21 </ b> B), the third inflating portion 33 provided adjacent to the vehicle outer side of the second inflating portion 32 inflates toward the vehicle outer side O.

  On the other hand, in the present embodiment, the tension belt 51 is disposed on the vehicle outer side O of the third inflating portion 33, and when the airbag 20B mounted in the vehicle is completely inflated, the tension belt 51 itself is tensioned along the front-rear direction. When T occurs, as shown in FIG. 8, the third inflating portion 33 is pushed out to the vehicle interior side I by the tension belt 51. At this time, the third inflating portion 33 and the second inflating portion 32 have portions overlapping each other in the vehicle interior / exterior direction, and the second inflating portion 32 is also pushed out to the vehicle inside I by the third inflating portion 33. . For this reason, according to the present embodiment, the second inflating part 32 adjacent to the front side of the first inflating part 30 can be protruded to the vehicle inner side I from the first inflating part 30.

  9 to 11 show still another embodiment of the present invention. In this embodiment, as shown in FIG. 9, the second inflating portion in the rear inflating portion 24 of the airbag 20 </ b> C is divided into a second inflating portion 82 and a third inflating portion 83, and the first inflating portion as the main inflating portion. The second embodiment is different from the first embodiment in that the second inflating portion 82 adjacent to the portion 38 is projected to the inside of the vehicle.

  As shown in FIG. 9, in the present embodiment, the vertical partition portion 44a, the horizontal partition portion 44b, and the lower end side of the airbag body 21C so as to surround the second inflatable portion 82 and the third inflatable portion 83 in a U shape. Cuts 89a, 89b, and 89c are formed respectively in the second and third inflating parts 82 and 83, with respect to the gas guiding channel 28 and the first inflating part 30 for the front seat. With the side as a free end, it can be moved independently in and out of the vehicle.

  As shown in FIGS. 9 and 10, tethers 84 and 85 are provided in the rear expansion portion 24 on the rear side of the gas inflow portion 27 to partition the internal region. As shown in FIG. 10, the tether 84 is fully inflated by sewing one end 84a on the vehicle interior side to the vehicle interior side wall portion 27a and the other end 84b on the vehicle exterior side to the vehicle exterior side wall portion 27b at the stitching portion 88. The partition part 86 extended in the up-down direction in the state is comprised, and the inner area | region of the rear expansion part 24 is divided into the 1st expansion part 38 and the 2nd expansion part 82. FIG.

  On the other hand, the tether 85 disposed on the center side (left side in the figure) of the tether 84 is also sewn with one end 85a on the vehicle interior side to the vehicle interior side wall portion 27a and the other end 85b on the vehicle exterior side to the vehicle exterior wall portion 27b. A partition portion 87 is formed by sewing at a portion 88 and extending in the up-down direction when the expansion is completed.

  The second inflating portion 82 is disposed on the bag body 21 </ b> C so as to be adjacent to the front side of the first inflating portion 38 for the rear seat. The second inflating portion 82 is configured by a region surrounded by the vehicle inner wall portion 27a, the vehicle outer wall portion 27b, and the tethers 84 and 85. Further, openings are provided on the upper end sides of the tethers 84 and 85, respectively, and communication portions 96 and 97 for introducing the inflation gas are provided.

  In the second inflating portion 82, when comparing the wall portion 82a on the vehicle inner side (vehicle inner side wall portion 27a) and the wall portion 82b on the vehicle outer side (vehicle outer side wall portion 27b) respectively defined by the tethers 84 and 85, As shown in FIG. 10, the length of the tethers 84 and 85 in the front-rear direction is such that the membrane length that can freely expand in the front-rear direction is longer at the wall portion 82a inside the vehicle and shorter at the wall portion 82b outside the vehicle. The position is set. For this reason, in the second expansion portion 82, the tether 85 on the opposite side to the first expansion portion 38 faces the vehicle outer side O based on the film length difference in the free expansion state.

  The third inflating portion 83 is adjacent to the vehicle inflating side of the second inflating portion 82 on the opposite side of the second inflating portion 82 in the front-rear direction from the first inflating portion 38 (that is, the central portion side of the bag body 21C). Is provided. The third inflating portion 83 is configured by a region surrounded by a vehicle inner side wall portion 27a, a vehicle outer side wall portion 27b, and a tether 85 having end portions coupled to these wall portions 27a and 27b. The third inflating part 83 in this example is connected to the second inflating part 82 via a tether 85, and when in the free inflating state, the tether 85 is in a state where the first inflating part 38 is arranged in the front-rear direction. In order to face the vehicle outer side O based on the film length difference of the second expansion part 82, the subsequent third expansion part 83 expands toward the vehicle outer side O.

  The connecting cloth 91 is composed of a flexible belt-like body. In the case of the present embodiment, the connecting cloth 91 is composed of a woven cloth made of polyamide yarn, polyester yarn or the like, and is disposed on the vehicle outer side O of the third inflating portion 83 as shown in FIGS. The base portion (rear end 91b) side of the bag body 21C is positioned closer to the first inflating portion 38 than the third inflating portion 83 (in this example, a suture site 88 that is sewn together with the tether 85, see FIG. 10). The bag body 21C is coupled to the vicinity of the lower edge.

  On the other hand, an attachment portion 92 that is attached and fixed to the body 1 side of the vehicle V is formed on the front end (front end 91a) side of the connecting cloth 91. Similar to the attachment portion 42 of the bag main body 21C, the attachment portion 92 uses the attachment bracket 11 and the bolt 12 to form the body of the vehicle V at the roof side rail portion RR (see FIG. 1) on the upper edge side of the window W1. Fixed to one side. In the present embodiment, when the airbag 20C is completely inflated, the connecting cloth 91 is disposed in a state of being inclined forward and supporting the vehicle outer side O of the third inflating portion 83 (see FIG. 9).

  In this embodiment, when the inflating gas flows into the airbag 20C, the front inflating portion 23 and the rear inflating portion 24 protrude and inflate downward from the non-inflated state. A tension T approximately along the longitudinal direction of the cloth 91 is generated. Then, as shown in FIG. 11, the third inflating portion 83 is pushed out to the vehicle interior side I by the connecting cloth 91. At this time, the third inflating portion 83 and the second inflating portion 82 have portions overlapping each other in the vehicle interior / exterior direction, and the second inflating portion 82 is also pushed out to the vehicle inner side I by the third inflating portion 83. . For this reason, according to the present embodiment, the second inflating portion 82 adjacent to the front side of the first inflating portion 38 can be protruded to the vehicle inner side I from the first inflating portion 38.

  As described above, according to the present embodiment, the second inflating portion 82 and the third inflating portion 83 are provided on the central portion side separated from the end portion in the front-rear direction of the bag body 21 </ b> C. A structure in which the portion 82 can be pushed out to the vehicle inner side than the first inflating portion 38 can be applied to the rear seat side. In the present embodiment, the front end 91a side of the connecting cloth 91 is attached and fixed to the roof side rail portion RR, so that the connecting cloth 91 is located outside the vehicle body O of the third inflating portion 83 located on the center side of the airbag body 21C. Therefore, the third inflating portion 83 can be favorably pressed toward the vehicle inner side I.

  As mentioned above, although embodiment of this invention was explained in full detail, this is an illustration to the last. For example, the position on one end side of the connecting cloth, that is, the position attached to the bag main body side can be changed as appropriate as long as the third inflating part can be pushed out to the inside of the vehicle. The present invention can be implemented with various modifications.

  DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Inner panel, 20, 20B, 20C ... Air bag, 21, 21B, 21C ... Bag main body, 30, 38 ... 1st expansion part (main expansion part), 32, 82 ... 2nd expansion part ( Sub-expansion part), 33, 83 ... 3rd expansion part (sub-expansion part), 51 ... Tension belt (connection cloth), 51a, 91a ... Front end (other end), 51b, 91b ... Rear end (one end), 91 ... Connecting cloth, FP ... Front pillar portion, RR ... Roof side rail portion, I ... Inside of vehicle, O ... Outside of vehicle, M ... Head protection airbag device, V ... Vehicle, W1, W2 ... Window

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, and expands and inflates so as to cover the inner side of the window by flowing in an expansion gas inside A head protection airbag device including an airbag,
The airbag is
The bag body,
The bag body is a separate and flexible band-shaped body, and includes a connecting cloth that connects the bag body and the body,
The bag body is
A first inflatable portion disposed on the side of the seating position of the occupant;
A second inflating portion that is provided adjacent to the front-rear direction of the first inflating portion, and has a membrane length that is freely expandable in the front-rear direction, which is set longer on the vehicle inner side and shorter on the vehicle outer side;
The second expansion portion is provided on the opposite side of the first expansion portion in the front-rear direction, adjacent to the second expansion portion, and receives the expansion of the second expansion portion when the expansion gas flows in. A third inflatable portion that is intended to expand toward the outside,
The connecting cloth is disposed so as to be able to support the vehicle exterior side of the third inflating portion, one end is on the bag main body on the first inflating portion side with respect to the third inflating portion, and the other end is on the body side, Each is attached,
The second inflating portion is configured to be pressed toward the vehicle inner side by the third inflating portion supported by the connecting cloth in a state where the inflating of the airbag in a vehicle mounted state is completed. A head-protecting airbag device.   2. The head protection airbag device according to claim 1, wherein the second inflating portion and the third inflating portion are provided on an end portion side in the front-rear direction of the bag body.   2. The head protection airbag device according to claim 1, wherein the second inflating portion and the third inflating portion are provided on a central portion side separated from an end portion in the front-rear direction of the bag body.   The head protection airbag device according to claim 1, wherein the other end of the connection cloth is attached and fixed to a pillar portion at a peripheral edge of the window. The head protection airbag device according to claim 1, wherein the other end of the connecting cloth is fixedly attached to a roof side rail portion on an upper edge side of the window.

Images