JP2015140087A - Head protection airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head protection airbag device capable of protecting the head of a passenger moving to the outside of a vehicle by an airbag having a predetermined portion inflating to be thick.SOLUTION: A head protection airbag device of the present invention comprises a thick reception section 34 inflating to be thick so that an inflation shield portion 20 of an airbag 19 can receive the head of a passenger. The length of the airbag 19 in a front-rear direction in a state in which the airbag 19 deploys flat is set larger than the length of the inflation shield portion 20 in the front-rear direction at a time of completion of inflation. The airbag 19 includes length restricting connected sections 37, 37 arranged on an upper end 34a and a lower end 34b of the thick reception section 34, respectively formed by connecting a vehicle inner sidewall section 23a to a vehicle outer sidewall section 23b so that the length in the front-rear direction of the airbag 19 is reduced to generally match the length of the inflation shield portion 20 at the time of completion of inflation.

Description

  The present invention relates to a head protecting airbag device including an airbag that is folded and housed on the upper edge side of the window inside the vehicle, and that expands and inflates so as to cover the vehicle interior of the window by flowing an inflating gas into the inside. About.

  Conventionally, in a head protection airbag device, as an airbag, an inflating shielding portion having a long length in the front-rear direction side is set in a state where both the vehicle inner wall portion and the vehicle outer wall portion are flatly deployed. In this configuration, the airbag was folded and stored so that the lower edge side approached the upper edge side from a state where a part of the airbag was folded so as to reduce the width dimension in the front-rear direction (for example, Patent Document 1).

  Further, as the head protection airbag device, the length dimension on the front and rear direction side in a state where at least one of the vehicle inner side wall portion and the vehicle outer side wall portion of the airbag is flattened is set to the front and rear direction side when the inflation is completed. The vehicle interior side wall or vehicle exterior wall that is set to be longer than the length dimension, and the length dimension on the front and rear direction side is set long, is folded back so as to provide a tack substantially along the vertical direction. There is a configuration that includes an airbag that is reduced in length and joined to each other to form a bag shape (see, for example, Patent Document 2).

JP 2012-206573 A JP 2011-57028 A

  However, the head protection airbag device described in Patent Document 1 can partially inflate a portion folded back so as to reduce the length dimension in the front-rear direction when the inflation is completed. The airbag is configured to be folded and stored so that the lower edge side approaches the upper edge side in a state where the airbag is simply folded back so as to reduce the width dimension in the front-rear direction. Therefore, in the head protection airbag device described in Patent Document 1, it is difficult to maintain this partially thickened state in the region on the lower edge side when the airbag is completely inflated. As a result, sagging occurs in the region on the lower edge side of the vehicle, and it is difficult to generate tension along the front and rear direction on the lower edge side of the airbag when the inflation is completed. There was room for improvement in terms of taking it accurately.

  Further, in the head protection airbag device described in Patent Document 2, the vehicle interior side wall portion or the vehicle exterior wall portion whose length dimension in the longitudinal direction side is set to be long is provided with a tack substantially along the vertical direction. The length of the front and rear direction side is folded back so that the peripheral edges are connected to each other to form a bag shape, and the portion of this tack is inflated thickly. Moreover, in the head protection airbag device described in Patent Document 2, both the vehicle inner side wall portion and the vehicle outer side wall portion are set to have long lengths in the front-rear direction, and are each provided with a tack, Some have a configuration in which the length of the side can be reduced. However, in the head protection airbag device described in Patent Document 2, even if the length dimension of both the vehicle outer wall portion and the vehicle inner wall portion can be reduced, the tack can be provided at different positions. Such a tack is disposed in the airbag so as to cover the outer peripheral side of the portion where the thin coupling portion that couples the vehicle inner wall portion and the vehicle outer wall portion is covered with a thickly inflated portion. This is a configuration. That is, in the head protection airbag device described in Patent Document 2, the tack is arranged corresponding to the thinned portion of the airbag when the inflation is completed, and the airbag has a thickness substantially in the entire front and rear. It expands so as to be uniform, and it does not partially inflate the vehicle inner wall portion and the vehicle outer wall portion to provide a thick portion.

  SUMMARY OF THE INVENTION The present invention solves the above-described problem, and can accurately protect the head of an occupant moving toward the outside of the vehicle with an airbag in which a predetermined portion is inflated thickly. The purpose is to provide.

The head protection airbag device according to the present invention includes an airbag that is folded and stored on the upper edge side of the window inside the vehicle,
A head protecting air having a configuration in which an airbag is provided with an upper edge side attached and fixed to the body side of the vehicle, and includes an inflating shielding part that expands and inflates so as to cover the inside of the window by flowing an inflating gas into the inside. A bag device,
Airbag
A vehicle interior side wall portion disposed on the vehicle interior side upon completion of expansion, and a vehicle exterior wall portion disposed on the vehicle exterior side,
The inflatable shielding part has a thick wall receiving part that expands thickly so as to be able to receive the head of the occupant,
Airbag
Set the length dimension on the front-rear direction side in the flat deployed state to be larger than the length dimension on the front-rear direction side of the expansion shield when the expansion is completed,
The length dimension of the front and rear direction side on the upper end side and the lower end side of the thick wall receiving part that combines the inner wall part and the outer wall part of the vehicle, and the length of the front and rear direction side of the expansion shielding part when the expansion is completed It is characterized in that a length-restricting coupling portion that can be shortened is arranged so as to substantially match the dimensions.

  In the head protection airbag device of the present invention, the airbag includes a thick wall receiving portion that expands thicker than other parts so that the head of the occupant can be received when the inflation is completed. The stop portion expands thickly so as to partially protrude toward the vehicle inner side and the vehicle outer side. In addition, the thick wall receiving portion is provided with a length restricting coupling portion that reduces the length dimension in the front-rear direction on the upper end side and the lower end side where the vehicle inner wall portion and the vehicle outer wall portion are coupled. It is constituted by. That is, in the head protection airbag device of the present invention, the vehicle interior side wall portion and the vehicle exterior wall portion are both in the front-rear direction on the upper end side and the lower end side of the thick wall receiving portion by the length regulation coupling portion. Since the length dimension on the side can be reduced, in the middle portion in the vertical direction of the thick wall receiving portion, there is a mode in which excess wall is generated in both the vehicle inner wall portion and the vehicle outer wall portion. The thick wall receiving portion can be inflated thickly in a well-balanced manner by expanding the surplus portion of the vehicle and the vehicle outer wall portion. In the head protection airbag device of the present invention, since the length dimension of the lower end side of the thick wall receiving portion is shortened by the length restricting coupling portion, the lower edge side when the inflation of the airbag is completed It is possible to suppress the occurrence of sagging in this area, and tension can be generated substantially along the front-rear direction on the lower edge side of the expansion shield when the expansion is completed. Therefore, when the side of the vehicle crashes, the airbag that has been inflated suppresses the passenger's head from slipping through the airbag when the passenger's head moving toward the outside of the vehicle is received. In addition, the head portion of the occupant moving toward the outside of the vehicle can be smoothly received by the thick wall receiving portion that is inflated partially and thickly in a balanced manner.

  Therefore, in the head protection airbag device of the present invention, the head of the occupant moving toward the outside of the vehicle can be accurately protected by the airbag in which a predetermined portion is inflated thickly.

Further, in the head protection airbag device of the present invention, when the inflation is completed, the inflation shielding portion is disposed on the side of the occupant's head seated on the seat and protects the occupant's head, And an auxiliary inflating part arranged so as to be connected to the front or rear of the inflating part,
The length restriction coupling portion is formed in a portion folded back so as to overlap the main expansion portion side portion of the auxiliary expansion portion on the vehicle outer side of the main expansion portion,
It is preferable that the thick-wall receiving part is constituted by a part on the main expansion part side in the auxiliary expansion part and a part on the auxiliary expansion part side in the main expansion part.

  If the head protection airbag device is configured as described above, when the airbag is completely inflated, the front or rear portion of the main inflation portion that protects the occupant's head is overlapped with the auxiliary inflation portion on the outside of the vehicle. As a receiving part, it can be inflated thickly so that it protrudes to the inside of the vehicle rather than other parts, and at the time of oblique collision where impact force acts from diagonally forward or diagonally backward, diagonally forward or diagonally outward of the vehicle The head of the moving occupant can be accurately protected by the thick wall receiving portion. Further, the thick wall receiving portion is configured to protrude toward the vehicle inner side by an auxiliary expansion portion provided on the vehicle outer side on the end side of the main expansion portion, and is provided in front of and behind the main expansion portion without providing a large step. Since it expands in a state where it gradually rises toward the inner side from the center of the direction to the end side, it can be softly received by gradually increasing the pressure according to the moving distance of the occupant moving forward and backward.

  Furthermore, in the head protection airbag device having the above-described configuration, if the length regulation coupling portion is configured only from a suture site using a suture, the length regulation coupling portion can be simply configured. This is preferable because it is easy to manufacture.

  Furthermore, in the head protection airbag device having the above-described configuration, if the airbag is manufactured by bag weaving, the airbag is manufactured by sewing the peripheral edges of a predetermined base fabric using sutures. Compared with the case where it does, it can reduce a manufacturing man-hour and can reduce manufacturing cost, and 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 a front view of the state where the air bag used with the head protection air bag device of an embodiment was developed flat. It is a schematic sectional drawing of the state which expanded the airbag of FIG. 2 alone, and respond | corresponds to the III-III site | part of FIG. It is a schematic sectional drawing of the state which expanded the airbag of FIG. 2 alone, and respond | corresponds to the IV-IV site | part of FIG. FIG. 3 is a front view of a state in which an airbag structure constituting the airbag of FIG. 2 is flatly deployed. In the head protection airbag device of an embodiment, it is the outline front view which looked at the state where the airbag completed inflation from the car inside. In the head protection airbag device of an embodiment, it is a schematic sectional view in the direction of order which shows the state where the airbag completed inflation.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A head protection airbag device M according to an embodiment has two rows having two windows (side windows) W1 and W2, as shown in FIG. It is mounted on a seat type vehicle V. In the embodiment, the head protection airbag device M is folded and stored on the upper edge side of the windows W1, W2 arranged on the right side of the vehicle V, and the inflation is completed so as to cover the right side of the driver seat DS. The airbag 19 will be described as an example having a configuration including the airbag 19. The head protection airbag device M according to the embodiment includes an airbag 19, an inflator 14, mounting brackets 11 and 15, and an airbag cover 9. As shown in FIG. 1, the airbag 19 has a rear pillar portion RP that passes from the lower edge side of the front pillar portion FP to the lower edge side of the roof side rail portion RR on the upper edge side of the windows W1 and W2 on the inner side of the vehicle V. Is folded and stored up to the area above.

  As shown in FIGS. 1 and 7, the airbag cover 9 is formed from the lower edges of 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. ,It is configured. 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 configured to be opened by being pushed by the airbag 19 so that the airbag 19 can be protruded toward the inside of the vehicle when deployed and inflated.

  The inflator 14 supplies inflation gas to the airbag 19, 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 uses a clamp 17 that is arranged on the outer peripheral side of the rear end 25a of the gas inlet portion 25 by inserting the distal end side including the vicinity of the gas discharge port into a gas inlet portion 25 described later of the airbag 19. The air bag 19 is connected. Further, as shown in FIG. 1, the inflator 14 uses a mounting bracket 15 that holds the inflator 14 and a bolt 16 that fixes the mounting bracket 15 to the inner panel 2 on the body (vehicle body) 1 side. The inner panel 2 is attached to a position above the center pillar portion CP. The inflator 14 is electrically connected to a control device (not shown) of the vehicle V via a lead wire (not shown). When the control device detects a side collision or oblique projection of the vehicle V, the inflator 14 is actuated from the control device. It is configured to operate upon input of a signal.

  The mounting bracket 11 is composed of two sheet metal plates, and is attached to each mounting portion 46 so as to sandwich each mounting portion 46 described later of the airbag 19. The attachment portion 46 is attached and fixed to the inner panel 2 on the body 1 side (see FIGS. 1 and 7).

  As shown in the two-dot chain line in FIG. 1 and FIG. 6, the airbag 19 flows in the inflation gas from the inflator 14 and expands from the folded state, so that the windows W1 and W2 and the windows W1 and W2 are expanded. The center pillar garnish 6 of the center pillar portion CP disposed between the rear pillar garnish 7 and the rear pillar garnish 7 of the rear pillar portion RP disposed on the rear side of the window W2 is configured to expand and inflate. . In the case of the embodiment, as shown in FIG. 2, the airbag 19 is in front and rear on the inflating shielding part 20 that inflates so as to cover the vehicle interior side of the windows W <b> 1 and W <b> 2 when inflation is completed. And a plurality of mounting portions 46 arranged in the direction. When the expansion is completed, the expansion shielding unit 20 passes from the window W1 to the rear pillar through the center pillar CP and the window W2, as shown in FIG. The expansion completion shape is a substantially rectangular plate shape whose longitudinal direction is substantially along the front-rear direction so as to be able to cover the inner side of the part RP toward the front side. Further, in the embodiment, as shown in FIG. 6, the expansion shield 20 places the lower edge 20b at the completion of expansion below the belt line BL formed by the lower edges of the windows W1, W2. The upper and lower width dimensions are set. In the case of the embodiment, the expansion shielding part 20 is configured from an area of the airbag 19 excluding the attachment part 46 and the gas inlet part 25.

  In the case of the embodiment, as shown in FIGS. 2 and 5, the airbag 19 is separated from the airbag component 22 manufactured by bag weaving using polyamide yarn or polyester yarn, and the airbag component 22. An attachment portion 46 and a connection belt 54 that are formed into a body are provided. The airbag structure 22 has a length dimension L1 (see FIG. 5) on the front-rear direction side in a flatly deployed state, and a length dimension L2 on the front-rear direction side of the airbag 19 (the front-rear direction side of the expansion shielding portion 20). It is set larger than the length dimension (see FIG. 2). As shown in FIGS. 2 to 5, the airbag structure body 22 is configured so that an inflator is separated from an inboard side wall portion 23 a positioned on the inboard side I and an inboard side wall portion 23 b positioned on the outboard side O when the inflation is completed. A gas inflow portion 23 that expands by inflating an inflating gas from 14 and a non-inflow portion that does not allow the inflating gas to flow into the inside wall portion 23a and the outside wall portion 23b. 44. In addition, the length dimension L2 of the airbag 19 in the front-rear direction side is set corresponding to the length in the front-rear direction when the vehicle is mounted (span between mounting portions 46 described later).

  In the case of the embodiment, the gas inflow portion 23 is formed so as to protrude from the gas guide channel 24 and the protective expansion portion 27 in the expansion shielding portion 20 and the upper edge 20a side of the expansion shielding portion 20. And is configured.

  As shown in FIGS. 2 and 5, the gas guide channel 24 is disposed so as to extend substantially along the front-rear direction on the upper edge 20 a side of the expansion shielding part 20. The expansion gas G, which is disposed over substantially the entire front and rear from the rear portion 30 of the front seat protection portion 28 to the portion of the rear seat protection portion 39, is discharged from the inflator 14. It is configured to guide the rear portion 30 of the front seat protection section 28 and the rear seat protection section 39 disposed below. In the case of the embodiment, the gas inlet port 25 connected to the inflator 14 is located at a position slightly shifted forward from the front and rear center of the gas guide channel 24 (a position that is substantially the center before and after the expansion shield 20). The gas guide channel 24 is disposed so as to protrude upward from the gas guide channel 24 (expansion shielding part 20). In the case of the embodiment, the gas inflow port portion 25 is formed so as to be inclined rearwardly with respect to the gas guide channel 24, and the rear end 25a side is opened so that the inflator 14 can be inserted. And the gas inflow port part 25 will be connected with the inflator 14 by fitting the clamp 17 in the outer peripheral side in the state which inserted the inflator 14 inside.

  As shown in FIGS. 2 and 6, the protective inflating portion 27 includes a front seat protecting portion 28 that inflates so as to cover the inside of the window W1 on the side of the front seat (driver's seat DS), and the side of the rear seat. A rear seat protecting portion 39 that expands so as to cover the inside of the vehicle window W2.

  As shown in FIG. 5, the front seat protector 28 is disposed on the front side and has a front side portion 29 that is set to have a large vertical dimension, and is disposed on the rear side and has a lower end positioned above the front side portion 29. And a rear part 30 (the width dimension in the vertical direction is set smaller than that of the front part 29). The front side portion 29 is arranged so as to cover the inner side of the front half of the window W1 when the expansion is completed. The outer shape is substantially rectangular, and the lower end side when the expansion is completed is connected to the belt line BL. It is comprised so that it may protrude below rather than. The rear side portion 30 is arranged so as to cover the inside of the rear half of the window W1 when the expansion is completed, and the width dimension on the vertical direction side is set smaller than the front side portion 29, and when the expansion is completed. The amount of protrusion from the belt line BL is made smaller than that of the front portion 29 and slightly protrudes below the belt line BL. The rear side portion 30 is arranged on the side of the head MH of the driver (occupant MP) seated in the front seat (in the case of the embodiment, the driver seat DS) when the expansion is completed. The rear portion 30 and a portion of the front portion 29 on the rear end side (a rear end portion 29c located behind a folding line CL2 described later) are the head MH of the driver (occupant MP). The front-side head protecting part 31 as a main inflating part that protects the head is configured. In the embodiment, in the front side portion 29, a portion (a portion located in front of the folding line CL2) excluding a part on the rear end side (rear end side portion 29c) is a main inflating portion (front side head protecting portion). The front side auxiliary expansion part 32 arrange | positioned so that it may continue in front of 31) will be comprised.

  The airbag 19 according to the embodiment has a front side portion 29 of the front seat protection portion 28 in the airbag structure 22 so as to reduce the length dimension of the airbag structure 22 in the flattened state on the front-rear direction side. Is folded at two folding lines CL1 and CL2 (see FIG. 5) arranged substantially along the vertical direction so that the intermediate portion 29b is positioned on the vehicle outer side O of the rear end side portion 29c. The upper end side and the lower end side of the folded and overlapped portion are respectively stitched over substantially the entire front and back at the upper edge side portion 45a and the lower edge side portion 45b of the peripheral edge coupling portion 45 described later. The length dimension in the front-rear direction side is shortened by sewing (bonding) using a thread. That is, in the airbag 19 according to the embodiment, the folded portion is folded and folded in the portion (the front portion 29 of the front seat protection portion 28) that is overlapped and arranged in the vehicle interior / exterior direction side (the left / right direction side when inflation is completed). The front end side portion 29a located on the front side of the curve CL1, the intermediate portion 29b that is a portion between the folding lines CL1 and CL2, and the rear end side portion 29c) located on the rear side of the folding line CL2 are shown in FIGS. As shown in the drawing, the thickened receiving portion 34 that expands thickly when the expansion is completed, and the stitched portions that connect the upper and lower end sides of the front end side portion 29a, the intermediate portion 29b, and the rear end side portion 29c, respectively, The length regulation coupling parts 37 and 37 arrange | positioned at the upper end 34a side and the lower end 34b side of the thick-wall receiving part 34 are comprised. As shown in FIG. 2, the length restricting coupling portions 37 and 37 are arranged over substantially the entire front and rear of the thick wall receiving portion 34 so as to be substantially along the front-rear direction. It is formed so as to extend slightly forward and backward than the meat receiving portion 34.

  The thick wall receiving part 34 includes a rear end side part 29c constituting a part on the front end 31a side which is the front side auxiliary expansion part 32 side in the front side head protection part 31, and a front side head protection in the front side auxiliary expansion part 32. The front end side portion 29a and the intermediate portion 29b that constitute the portion on the rear end 32a side that is the portion 31 side are configured to be overlapped on the vehicle interior / exterior direction side (left / right direction side). The thickness dimension at the time of completion of expansion is set larger than the general part 35 which is a part on the rear end 31b side (see FIG. 3). That is, the thick wall receiving portion 34 is formed by folding back a portion of the front auxiliary expansion portion 32 on the front head protection portion 31 side so as to overlap the vehicle outer side O of the front head protection portion 31. Further, the thick wall receiving portion 34 is configured so that the lower end side protrudes greatly downward from the belt line BL when the expansion is completed (see FIG. 6). In the airbag 19 of the embodiment, the folding line CL1 is disposed near the boundary portion between the front portion 29 and the rear portion 30 in the front seat protection portion 28 when the airbag structure 22 is folded (see FIG. (See FIG. 2). Further, in the airbag 19 of the embodiment, as shown in FIGS. 6 and 7, when the inflation is completed, the thick wall receiving portion 34 is disposed on the side of a steering wheel SW described later (the inflation of the airbag device 57 for the steering wheel). It will be arranged in the vicinity of the outside O of the airbag 58 at the time of completion.

  Further, in the airbag 19 of the embodiment, the main inflating part (front head protecting part 31) and the front auxiliary inflating part 32 in the front seat protecting part 28 are formed so as to bend the airbag constituting body 22. It is divided by the part of the folding line CL2. As shown in FIG. 5, the folding line CL2 is arranged between the thickness regulating parts 49 and 50, which will be described later, and is arranged in a region where the thickness regulating part is not arranged. Since the bent state at the part is maintained by the length regulation coupling portions 37 and 37 arranged on the upper end side and the lower end side, the expansion gas from the inflator 14 is caused to flow into the main expansion portion. When the front side head protection part 31 expands, it is difficult to easily cancel the bent state, and the front side auxiliary expansion part 32 delays the start of inflow of the inflation gas more than the front side head protection part 31, Will expand. Further, since the front auxiliary expansion portion 32 is bent in the region by a folding line CL1 that divides the front end side portion 29a and the intermediate portion 29b, the front end that becomes the front end side of the front auxiliary expansion portion 32 The side portion 29a expands after the start of the inflow of the expansion gas is delayed as compared with the intermediate portion 29b.

  The rear-seat protection unit 39 is disposed on the side of the head of the occupant seated in the rear seat when the inflation is completed, and the rear-side head protection unit 40 capable of protecting the occupant's head, and the rear-side head protection And a rear auxiliary expansion portion 41 extending forward from the front lower end side of the portion 40 (see FIGS. 2, 5, and 6). The rear auxiliary expansion portion 41 is disposed below the gas guide channel 24 so as to fill a space between the front head protection portion 31 and the rear head protection portion 40. The rear auxiliary expansion portion 41 is in communication with the rear head protection portion 40 on the rear lower end side, but this communication is performed so that the start of inflow of the inflation gas is delayed more than the rear head protection portion 40. The opening area of the part is set to be small.

  The non-inflow part 44 includes a peripheral joint part 45 that constitutes an outer peripheral edge of the gas inflow part 23, a partition joint part 47, 48 and a thickness regulating part 49, 50, 51, disposed in the region of the gas inflow part 23. 52, an attachment portion 46 for attaching the airbag 19 to the inner panel 2, and a connecting belt 54.

  The peripheral edge coupling portion 45 is disposed so as to surround the periphery of the gas inflow portion 23 over the entire circumference except for the rear end 25a side of the gas inlet portion 25. The attachment part 46 is a part for attaching the upper edge 20a side of the expansion shielding part 20 to the inner panel 2 which is the body 1 side of the vehicle V. A plurality of attachment parts (5 in the case of the embodiment) ) Is formed. Each mounting portion 46 is formed with a mounting hole through which the mounting bolt 12 can be inserted (not shown). In the case of the embodiment, each mounting portion 46 is separated from the airbag component 22. What is formed from a woven fabric made of polyamide yarn, polyester yarn or the like is sewn to the upper edge 20a side of the expansion shielding portion 20 and configured.

  The partition coupling portion 47 is configured as a substantially rod shape that extends upward from the lower edge side portion 45b in the peripheral coupling portion 45 so as to partition the front side head protection portion 31 and the rear auxiliary expansion portion 41. The partition coupling portion 47 includes a branch portion 47a that extends forward so as to enter the region of the front side head protection portion 31 in the vicinity of the upper and lower centers. The branch portion 47a is disposed in order to regulate the thickness of the front side head protection portion 31. The partition coupling portion 48 constitutes the lower edge side of the gas guide flow path 24 and partitions the rear auxiliary expansion section 41 from the gas guide flow path 24 and the rear head protection section 40. It is comprised as a substantially reverse L-shape which extends back and forth from the upper end of 47 and extends the rear end side further downward. On the front end side of the partition coupling portion 48, a circular partition portion 48a having a substantially circular shape is disposed so as to regulate the thickness of the front side head protecting portion 31.

  The thickness restricting portion 49 has a substantially circular outer shape, and is disposed in the vicinity of the front end of the gas guide channel 24 and in the vicinity of the upper front end of the rear portion 30 in the front seat protecting portion 28. . The thickness restricting portion 50 is formed in a region of the front side head protecting portion 31 and has a front side portion in the front seat protecting portion 28, with the outer shape being a substantially gourd shape arranged substantially along the longitudinal direction in the vertical direction. In the vicinity of the boundary portion between the rear portion 30 and the rear portion 30, it is disposed at a position slightly below the thickness regulating portion 49. Specifically, the thickness restricting portion 50 is disposed at a position that is substantially in the middle of the upper and lower sides of the rear portion 30 in the front seat protecting portion 28. The thickness restricting portion 51 has a substantially circular outer shape, and is disposed at a position slightly below the thickness restricting portion 50 at a position on the folding line CL1 of the front portion 29 in the front seat protecting portion 28. ing. Specifically, the thickness restricting portion 51 is disposed at a position that is substantially in the middle of the front side portion 29 of the front seat protecting portion 28. Although the thickness restricting portion 51 is disposed on the folding line CL1, the distance from the upper and lower edges of the front portion 29 is determined from the upper and lower edges of the rear portion 30 in the thickness restricting portion 50. It is set to be larger than the separation distance, and is configured to easily allow the inflation gas G to flow into the interior. The thickness restricting portion 52 is disposed on the lower edge side of the front side head protecting portion 31 and in the vicinity of the belt line BL, and protrudes upward from the lower edge side portion 45b of the peripheral edge coupling portion 45. The outer shape is configured as a flat, substantially T-shape.

  The connecting belt 54 is disposed on the front edge side of the inflating shielding part 20 and is formed from a woven fabric made of polyamide yarn, polyester yarn, or the like as the airbag component 22 as a separate body from the airbag component 22. Has been. The connecting belt 54 is arranged so that the base side is sewn to the front edge side slightly above the center of the upper and lower sides of the expansion shielding part 20 and protrudes forward. The front end side of the connecting belt 54 is a portion that is attached and fixed to the inner panel 2 on the body 1 side using the mounting bracket 11 and the mounting bolt 12, similarly to the mounting portion 46, and the mounting bolt 12 can be inserted. A through hole (not shown).

  Further, in the vehicle V on which the head protection airbag device M of the embodiment is mounted, the steering wheel SW disposed in front of the driver seat DS has a steering wheel that operates when an impact force is applied from the front side of the vehicle V. An air bag device 57 is disposed (see FIGS. 1, 6 and 7). The airbag device 57 includes an airbag 58 that is folded and accommodated in a boss portion (not shown) of the steering wheel SW, and an inflator (not shown) that allows inflation gas to flow into the airbag 58. Is done. The airbag 58 is inflated in a substantially disc shape so that an inflation gas flows into the interior during the application of an impact force from the front including an oblique collision so as to cover the upper surface of the steering wheel SW over a substantially entire area. Is configured to do. (See FIGS. 1, 6 and 7).

  Next, mounting of the head protection airbag device M of the embodiment on the vehicle V will be described. From the state in which the airbag component 22 in which the attachment portion 46 and the connecting belt 54 are sewn in advance is overlapped and flattened with the vehicle inner wall portion 23a and the vehicle outer wall portion 23b overlapped, the folding lines CL1, Folded at the CL2 site, the upper and lower ends of the folded site were sewn so as to form the length regulation coupling part 37 at the upper edge side part 45a and lower edge side part 45b of the peripheral edge coupling part 45, The meat receiving portion 34 is formed, and the airbag 19 is formed. Thereafter, the airbag 19 is folded so that the lower edge 20b approaches the upper edge 20a and the width dimension in the vertical direction is reduced. Then, after the folding of the airbag 19 is completed, a predetermined portion is wrapped with a wrapping material (not shown) for preventing collapse. Next, the attachment bracket 11 is attached to each attachment portion 46 and the tip of the connecting belt 54. Further, while using the clamp 17, the inflator 14 is connected to the gas inlet portion 25, and the mounting bracket 15 is attached around the inflator 14 to form an airbag assembly.

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

  If the inflator 14 is operated after the head protection airbag device M is mounted on the vehicle V, the inflation gas discharged from the inflator 14 flows into the inflation shield 20 and inflates the inflation shield 20. 1 breaks the wrapping material (not shown), pushes open the airbag cover 9 composed of the lower edges of the front pillar garnish 4 and the roof head lining 5 and protrudes downward. As shown in FIG. 6, the windows W1 and W2, the center pillar portion CP, and the rear pillar portion RP are greatly expanded so as to cover the inside of the vehicle. Further, when a collision object (not shown) collides from the diagonally right front side of the vehicle V, the steering wheel airbag device 57 disposed in front of the driver's seat DS also has an airbag as shown in FIGS. 58 will be actuated to inflate.

  In the head protection airbag device M according to the embodiment, the airbag 19 is provided with the thick wall receiving portion 34 that expands thicker than other parts so that the airbag 19 can receive the head MH of the occupant MP when the inflation is completed. , And the thick wall receiving portion 34 expands thickly so as to partially protrude toward the vehicle interior side I as shown in FIG. In addition, the thick wall receiving portion 34 has a length-restricting coupling that shortens the length dimension in the front-rear direction on the upper end 34a side and the lower end 34b side where the inner wall portion 23a and the outer wall portion 23b are combined. It is configured by arranging the portions 37 and 37. That is, in the head protection airbag device M of the embodiment, the inner wall portion 23a and the outer wall portion 23b are both length-regulated on the upper end 34a side and the lower end 34b side of the thick wall receiving portion 34. The length dimension on the front and rear direction side is shortened by the coupling portions 37 and 37. More specifically, the thick wall receiving portion 34 folds the airbag structure 22 in a state where the vehicle inner side wall portion 23a and the vehicle outer side wall portion 23b are flattened by two folding lines CL1 and CL2, The upper and lower ends of the folded portion are formed by sewing using sutures so as to form length regulation coupling portions 37 and 37. For this reason, in the middle portion in the vertical direction of the thick wall receiving portion 34, there is a mode in which excess wall is generated in both the vehicle inner wall portion 23 a and the vehicle outer wall portion 23 b, and the vehicle inner wall portion 23 a and the vehicle outer wall portion are formed. The thick-wall receiving part 34 can be inflated thickly in a well-balanced manner so as to expand the surplus portion with 23b. In the head protecting airbag device M of the embodiment, the length dimension of the lower end 34b side of the thick wall receiving portion 34 is reduced by the length restricting coupling portion 37 and is integrated with the front and rear portions. Since it is configured, it is possible to suppress sagging in the region of the airbag 19 on the lower edge 20b side when the inflation is completed, and on the lower edge 20b side of the inflation shield 20 when the inflation is completed, Tension can be generated substantially along the front-rear direction on a straight line connecting the rear-end-side mounting portion 46. Therefore, when the head 19 MH of the occupant (driver) MP moving toward the vehicle outer side O is received by the airbag 19 whose inflation has been completed at the time of a side collision of the vehicle V, the head MH of the occupant MP is The head of the occupant MP that moves toward the vehicle outer side O can be suppressed by moving through the airbag 19 so as to be partly thick and well-balanced. MH can be received smoothly.

  Therefore, in the head protection airbag device M of the embodiment, the head MH of the occupant MP moving toward the vehicle outer side O can be accurately protected by the airbag 19 in which a predetermined portion is inflated thickly. .

  Further, in the head protection airbag device M of the embodiment, the inflation shielding part 20 is disposed on the side of the head MH of the occupant MP seated on the seat when the inflation is completed to protect the head MH of the occupant MP. The front side head protecting part 31 as the main inflating part and the front side auxiliary inflating part 32 arranged so as to be continuous with the front side of the front side head protecting part 31 are configured. The front end side part 29a and the intermediate part 29b on the front side head protection part 31 side in the front side auxiliary inflating part 32 are placed on the vehicle outer side O of the rear end side part 29c which is a part of the front side head protection part 31 on the front end 31a side. It is formed in a portion that is folded back so as to be overlapped, and the front end side portion 29a and the intermediate portion 29b on the front side head protection portion 31 side in the front side auxiliary expansion portion 32, and the front side auxiliary expansion portion 32 side in the front side head protection portion 31 are formed. The rear end portion 29c, Constitute a receiving portion 34. Therefore, when the airbag 19 is completely inflated, the front portion of the front head protecting portion 31 that protects the head MH of the occupant MP is used as a thick wall receiving portion 34 in which the front auxiliary inflating portion 32 is stacked on the vehicle outer side O. The head of the occupant MP that can be inflated thicker than the other general part 35 so as to protrude toward the vehicle inner side I and moves toward the vehicle outer right diagonally forward at the time of the oblique collision in which the impact force acts from the diagonally right front. The portion MH can be accurately protected by the thick wall receiving portion 34. Further, the thick wall receiving portion 34 is configured to protrude to the vehicle inner side I by the front auxiliary expansion portion 32 provided on the vehicle outer side O on the front end 31a side of the front head protecting portion 31, and is provided with a large step. Without expanding, it expands in a state of gradually rising to the vehicle inner side I from the vicinity of the center in the front-rear direction (rear end 31b side) to the front end 31a side (see FIG. 7). The pressure can be gradually increased according to the moving distance of the moving occupant MP and received softly.

  In particular, in the head protection airbag device M of the embodiment, the thick wall receiving portion 34 projects the lower end side largely below the belt line BL when the airbag 19 is completely inflated, as shown in FIG. Therefore, when the head MH of the occupant MP is received, the vehicle outer side on the lower end side can be supported by a member such as a door trim constituting the belt line BL, and the thick wall receiving portion 34 can be supported. Thus, the head MH of the occupant MP can be accurately received. Further, in the head protection airbag device M of the embodiment, the thick wall receiving portion 34 is disposed at a position near the vehicle outer side O of the steering wheel SW as shown in FIGS. ing. Therefore, at the time of the oblique collision in which the impact force acts diagonally from the front right, the thick wall receiving portion 34 is spaced from the airbag 58 on the vehicle outer side O of the steering wheel airbag 58 that has been inflated. The head MH of the occupant MP that moves toward the front right side of the vehicle is entered into the gap between the airbags 19 and 58. And can be accurately received by the thick wall receiving portion 34 of the airbag 19.

  Furthermore, in the head protection airbag device M of the embodiment, the length regulation coupling portions 37 and 37 are configured only from a suture site using a suture, so that a part of the airbag component 22 is folded back. The length-restricted coupling portions 37 and 37 can be formed by sewing the folded portion using a suture thread, and the length-restricted coupling portion can be configured in a simple manner. 19 is easy to manufacture. Of course, if such a point is not taken into account, the length regulation coupling portion may be formed using an adhesive or the like. In the embodiment, the length regulation coupling portion is a straight line formed continuously along the front-rear direction, but the outer shape of the length regulation coupling portion is not limited to the embodiment. For example, it is possible to form a stitched portion that is joined in a spot shape, and to arrange a plurality of such spot-like stitched portions in the front-rear direction along the front-rear direction, and to interrupt the front-rear direction. It is good also as a structure to couple | bond together.

  Furthermore, in the head protection airbag device M of the embodiment, since the airbag 19 (airbag component 22) is manufactured by bag weaving, the airbag is sewn to the periphery of a predetermined base fabric. Compared to the case of manufacturing by sewing with a thread, the number of manufacturing steps can be reduced, and the manufacturing cost can be reduced. Of course, if such a point is not taken into consideration, the airbag may be manufactured by sewing the peripheral edges of a predetermined base fabric.

  In the head protection airbag device M of the embodiment, the thick wall receiving portion folds a part of the airbag structure, and connects the upper end side and the lower end side of the folded portion over the entire length. It is comprised by combining by a part. In other words, the thick wall receiving portion is configured integrally with the front and rear portions (general portions) at the upper end side and the lower end side by the length regulation coupling portion. The thick wall receiving portion and the length regulation coupling portion are not limited to the embodiment, and the thick wall receiving portion is formed by pinching a part of the airbag structure, and both the upper and lower ends of this pinched portion only. May be formed so as to be sewn together.

  Further, in the embodiment, the airbag having a configuration in which the thick wall receiving portion is disposed on the front end side of the front seat protection portion is described as an example, but the arrangement position of the thick wall receiving portion is described here. The present invention is not limited to this, and may be configured to be arranged on the rear end side of the rear seat protection portion, and further, arranged on both the front end side of the front seat protection portion and the rear end side of the rear seat protection portion. Or it is good also as a structure arrange | positioned in the front-and-rear both-ends side of each of the front seat protection part and the rear seat protection part.

DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Inner panel, 9 ... Air bag cover, 14 ... Inflator, 19 ... Air bag, 20 ... Expansion | swelling shielding part, 22 ... Air bag structure, 23 ... Gas inflow part, 23a ... Car interior side wall part, 23b DESCRIPTION OF SYMBOLS Car exterior wall part, 27 ... Protection expansion part, 31 ... Front side head protection part (main expansion part), 31a ... Front end, 31b ... Rear end, 32 ... Front side auxiliary expansion part, 32a ... Rear end, 34 ... Thick wall Receiving part, 34a ... upper end, 34b ... lower end, 35 ... general part, 37 ... length regulation coupling part, W1, W2 ... window, V ... vehicle, M ... head protection airbag device.

Claims (4)

It has an airbag that is folded and stored on the upper edge of the window inside the car,
The airbag is configured to include an expansion shielding part that is fixedly attached to the vehicle body side on the upper edge side, and that expands and inflates so as to cover the vehicle interior side of the window by allowing an inflation gas to flow into the airbag. A protective airbag device,
The airbag is
A vehicle interior side wall portion disposed on the vehicle interior side upon completion of expansion, and a vehicle exterior wall portion disposed on the vehicle exterior side,
The inflatable shielding part includes a thick wall receiving part that expands thickly so that the head of the occupant can be received;
The airbag is
Set the length dimension on the front-rear direction side in a state of being flattened larger than the length dimension on the front-rear direction side of the expansion shield when the expansion is completed,
The length dimension in the front-rear direction side is set in the front-rear direction of the expansion shielding part when the expansion is completed, on the upper end side and the lower end side of the thick wall receiving part in which the vehicle inner wall part and the vehicle outer wall part are combined. A head protecting airbag device comprising a length-restricting coupling portion that is contracted so as to substantially match a length dimension on the side. The inflating shield part is arranged on the side of the head of the occupant seated on the seat when the inflating is completed, and is connected to the front or rear of the main inflating part to protect the occupant's head. An auxiliary expansion portion to be disposed,
The length restriction coupling portion is formed in a portion folded back so as to overlap the main expansion portion side portion of the auxiliary expansion portion on the vehicle outer side of the main expansion portion,
The part on the side of the main expansion part in the auxiliary expansion part and the part on the side of the auxiliary expansion part in the main expansion part constitute the thick wall receiving part. The head protection airbag device according to the description.   The head protection airbag device according to claim 1, wherein the length regulation coupling portion is configured only from a suture site using a suture thread. The head protection airbag device according to any one of claims 1 to 3, wherein the airbag is manufactured by bag weaving.

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