JP2014015096A - Vehicular curtain airbag system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular curtain airbag system which enables a curtain airbag to satisfactorily exert initial head protection performance and can satisfactorily maintain the storability of a folded curtain airbag.SOLUTION: A curtain airbag 14 is fixed to a vehicle body by a first mounting piece 44, a second mounting piece 46, and third mounting pieces 48. Among them, the first mounting piece 44 is disposed at a position overlapping a reference line P in a vehicular vertical direction passing a center O of a rear side heat protection chamber 34 located away from a gas introduction part 28 in a front-back direction, and defines the position in the vehicular vertical direction of the rear side heat protection chamber 34 during inflation or deployment of the curtain airbag 14. In addition, the second mounting piece 46 has an intensity set to be lower than that of the first mounting piece 44.

Description

  The present invention relates to a curtain airbag device for a vehicle.

  2. Description of the Related Art Conventionally, a curtain airbag device for a vehicle that protects a seated occupant's head by inflating and deploying a curtain airbag along a side window from an end of the roof head lining in the vehicle width direction at the time of a side collision is known. (See Patent Documents 1 and 2 below).

  Among these, in Patent Document 1, in order to attach the curtain airbag to the vehicle body, four attachment pieces (attachment tabs) provided at the upper end of the curtain airbag are stacked and stitched to improve the strength of the attachment piece. Techniques for making them disclosed are disclosed.

  Patent Document 2 discloses a technique for reinforcing the periphery of the attachment hole of the attachment piece by adding a sewing thread around the attachment hole formed in the attachment piece of the curtain airbag.

JP 2003-291717 A JP 2007-45418

  However, in the case of the above prior art, there are problems described below. That is, generally, a curtain airbag is configured such that gas is supplied from a gas flow path provided on the upper edge side to a head protection chamber provided below the gas flow path. At this time, since the head protection chamber swells in the back thickness direction, tension (tension) is generated in the curtain airbag substantially in the vehicle front-rear direction. For this reason, the curtain airbag is contracted substantially in the vehicle front-rear direction. As a result, it is conceivable that a large tensile force is applied to the attachment piece away from the gas inlet from the inflator, and the attachment piece is broken. In this case, if the mounting piece provided above the central region of the head protection chamber is broken, the head protection chamber is lowered to the vehicle lower side, so that the intended head protection performance may change.

  For the above problem, it is conceivable to reinforce the mounting piece by applying the prior art described in Patent Documents 1 and 2. However, if all the mounting pieces are reinforced in the same manner, the folded curtain airbag becomes bulky, and the storage capacity of the roof head lining and the roof side rail in a narrow space is lowered.

  In consideration of the above-described facts, the present invention can achieve the desired head protection performance of the curtain airbag, and can maintain the storability of the folded curtain airbag. The object is to obtain an airbag device.

  The curtain air bag device for a vehicle according to the first aspect of the present invention communicates with an inflator that generates gas when activated, a gas introduction part into which gas from the inflator is introduced, and the gas introduction part. And a head protection chamber that is inflated and deployed between the head of the seated occupant and the side window in response to the supply of gas, and is folded to the back side of the end of the roof head lining in the vehicle width direction. A curtain airbag main body that is stored and inflated and deployed in a curtain shape along the side window from the vehicle width direction outer end of the roof head lining by supplying gas, and provided at the upper end of the curtain airbag main body And is used for attachment to a vehicle body, and passes through the center of the head protection chamber at a position away from the gas introduction portion in the vehicle front-rear direction. A first mounting piece disposed at a position overlapping a reference line along both vertical directions; and provided at an upper end portion of the curtain airbag main body and for mounting to a vehicle body; A second mounting piece disposed on an end side of the curtain airbag main body in the vehicle front-rear direction and having a strength lower than that of the first mounting piece.

  A curtain airbag device for a vehicle according to a second aspect of the present invention is the curtain airbag device for a vehicle according to the first aspect, wherein the curtain airbag main body extends along an upper edge of the curtain airbag main body, and the gas inlet and the head protection. A gas supply path communicating with the chamber is provided, and the second mounting piece is set at a position that does not overlap the gas supply path in the vehicle front-rear direction.

  A curtain airbag device for a vehicle according to a third aspect of the invention is the curtain airbag device for a vehicle according to the first aspect, wherein the second mounting piece is a head closest to an end in the vehicle front-rear direction in the curtain airbag main body. The position is set so that it does not overlap the protection chamber in the vehicle longitudinal direction.

  A curtain airbag device for a vehicle according to a fourth aspect of the present invention is the curtain air bag device according to any one of the first to third aspects, wherein the first mounting piece and the second mounting piece include a vehicle body. Mounting holes are formed respectively, and the distance from the upper end of the curtain airbag main body portion to the center of the mounting hole in the second mounting piece is the curtain airbag main body portion in the first mounting piece. Is set longer than the distance from the upper end of the mounting hole to the center of the mounting hole, and the first mounting piece and the second mounting piece are mounted on the vehicle body at the same height.

  According to the first aspect of the present invention, the curtain airbag main body having the gas introduction section and the head protection chamber is stored in a folded state on the back side of the end of the roof head lining in the vehicle width direction outside. . From this state, for example, when a side collision occurs, the inflator is activated to generate gas. This gas is introduced into the curtain airbag body from the gas introduction part. As a result, the curtain airbag main body is inflated and deployed in a curtain shape along the side window from the outer end of the roof head lining in the vehicle width direction.

  By the way, when the curtain airbag main body portion is inflated and deployed in a curtain shape, the curtain airbag main body portion contracts substantially in the vehicle front-rear direction. For this reason, the first mounting piece and the first mounting piece disposed at a position overlapping the reference line along the vehicle vertical direction passing through the center of the head protection chamber located at a position away from the gas introduction portion in the vehicle longitudinal direction. On the other hand, the second attachment piece disposed on the end side of the curtain airbag main body in the vehicle front-rear direction is pulled toward the gas introduction unit.

  Here, in this invention, since the intensity | strength of the 2nd attachment piece is lower than the 1st attachment piece, even if it cuts temporarily, the 2nd attachment piece will cut ahead of the 1st attachment piece. For this reason, the input to the first mounting piece is reduced (that is, the load on the first mounting piece is reduced), and the first mounting piece is prevented from being cut. As a result, the positional relationship in the vertical direction of the vehicle between the attachment point to the vehicle body and the head protection chamber at the first attachment piece in the inflated and deployed state of the curtain airbag is maintained, and the head protection chamber is at the intended position. Maintain the expanded state.

  Moreover, since it is the structure which changes the strength setting of the 1st attachment piece and 2nd attachment piece which are arrange | positioned in the position which overlaps with the reference line mentioned above, it is necessary to reinforce all the attachment pieces like the prior art mentioned above. Absent. For this reason, even if a curtain airbag main-body part is folded, it does not become bulky.

  According to the second aspect of the present invention, the gas introduced from the gas introduction part is supplied to the head protection chamber after passing through the gas supply path.

  Here, in the present invention, since the second mounting piece is set at a position that does not overlap the gas supply path in the vehicle front-rear direction, the second mounting piece is disposed at a position spaced from the terminal end of the gas supply path in the vehicle front-rear direction. Will be. For this reason, when the curtain airbag main body is contracted in the vehicle longitudinal direction, the second mounting piece is larger than the case where the second mounting piece is set at a position overlapping the gas supply path in the vehicle longitudinal direction. Receives tensile force. Thereby, the second mounting piece exhibits an appropriate fuse effect, and the second mounting piece bears more load applied to the first mounting piece.

  According to the third aspect of the present invention, the second mounting piece is set at a position that does not overlap the head protection chamber closest to the end in the vehicle front-rear direction and the vehicle front-rear direction in the curtain airbag main body. The second mounting piece is disposed at a position where the second mounting piece is separated from the end of the head protection chamber in the vehicle front-rear direction. For this reason, when the curtain airbag main body is contracted in the vehicle front-rear direction, the second mounting piece is compared to the case where the second mounting piece is set at a position overlapping the head protection chamber in the vehicle front-rear direction. Receives greater tensile force. Thereby, the second mounting piece exhibits an appropriate fuse effect, and the second mounting piece bears more load applied to the first mounting piece.

  According to this invention of Claim 4, the distance from the upper end of the curtain airbag main-body part in a 2nd attachment piece to the center of the said attachment hole is the said attachment hole from the upper end of the curtain airbag main-body part in a 1st attachment piece. It is set longer than the distance to the center. And the 1st attachment piece and the 2nd attachment piece are being fixed to the vehicle body in the position used as the same height. For this reason, if the length relationship is set so that the first mounting piece and the second mounting piece receive a tensile load at substantially the same timing, the same load is substantially reduced between the first mounting piece and the second mounting piece. Can be evenly borne. That is, the load burden on the first mounting piece and the second mounting piece is ½ each.

  As described above, the curtain airbag device for a vehicle according to the first aspect of the present invention can satisfactorily exert the desired head protection performance of the curtain airbag, and is in a folded state. It has the outstanding effect that the storage property of can be maintained satisfactorily.

  The curtain airbag device for a vehicle according to the present invention as set forth in claim 2 and claim 3 effectively exhibits the load bearing effect of the first mounting piece by the second mounting piece, and as a result, the effect of preventing breakage of the first mounting piece. It has the excellent effect that the reliability with respect to can be improved.

  The curtain airbag device for a vehicle according to the present invention described in claim 4 has an excellent effect that the first mounting piece can be made more difficult to cut.

FIG. 3 is a front view showing a curtain airbag in a state where no gas is supplied in the vehicle curtain airbag device according to the present embodiment in a flat shape. It is the principal part enlarged front view which expanded the 1st attachment piece and 2nd attachment piece vicinity of the curtain airbag shown by FIG. (A) is an expanded longitudinal cross-sectional view of the 1st attachment piece of the state cut | disconnected along the 3 (A) -3 (A) line | wire of FIG. 1, (B) is 3 (B) -3 ( B) It is an expanded longitudinal cross-sectional view of the 2nd attachment piece of the state cut | disconnected along the line.

≪Overall structure≫
Hereinafter, a curtain airbag device 10 for a vehicle according to an embodiment of the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side.

  FIG. 1 shows the overall shape of a curtain airbag 14 (described later) of a vehicle curtain airbag device 10 according to this embodiment when the curtain airbag 14 is deployed in a planar shape. In the state shown in FIG. 1, the gas is not yet supplied to the curtain airbag 14, but in the following description, the accommodation of the vehicle curtain airbag device 10 in the vehicle mounted state is also shown in FIG. 1. Will be described as appropriate.

  As shown in this figure, a curtain airbag device 10 for a vehicle includes an inflator 12 that generates gas at the time of a side collision, and a curtain airbag that is connected to the inflator 12 and is inflated and deployed by receiving supply of gas from the inflator 12. 14, and an airbag module 16 configured to include the airbag module 16. The airbag module 16 is assembled as a long and slender member by folding the curtain airbag 14 in a state before being mounted on the vehicle. In this state, the airbag module 16 is located in a space between a roof side rail (not shown) and an end 18A on the outer side in the vehicle width direction of the roof head lining 18 which is a molded ceiling, a front pillar (not shown), and the vehicle interior side. It is stored in a space between the disposed front pillar garnish 20 and a space between a rear pillar (not shown) and a rear pillar garnish 22 disposed on the vehicle interior side.

  Supplementally, the roof side rail is a vehicle body skeleton member having a closed cross-sectional structure disposed along the vehicle longitudinal direction at both ends of the vehicle body roof in the vehicle width direction. The airbag module 16 is fixed to a rail inner panel that constitutes an inner portion of the roof side rail in the vehicle width direction. The front pillar garnish 20 is an interior member lined on the vehicle interior side of the front pillar which is a vehicle body skeleton member having a closed cross-sectional structure. Further, the rear pillar garnish 22 is an interior member lined on the vehicle interior side of the rear pillar which is a vehicle body skeleton member having a closed cross-sectional structure.

  The inflator 12 is formed in an elongated cylindrical shape, and as an example, the inside is filled with a gas generating agent or the like. The base end side of the inflator 12 is fixed to the vehicle body via a bracket (not shown). Further, a gas ejection hole is formed on the tip side of the inflator 12.

  The curtain airbag 14 is configured as a rectangular cloth-like member having a size capable of covering both the front seat side window 24 and the rear seat side window 26 in a vehicle side view. More specifically, the curtain airbag 14 includes a gas introduction portion 28 into which the tip side of the inflator 12 is inserted, and a gas supply path 30 that extends linearly in the vehicle front-rear direction along the upper edge of the curtain airbag 14. A curtain airbag main body 36 including a front head protection chamber 32 and a rear head protection chamber 34 provided on the vehicle lower side of the gas introduction portion 28 corresponding to each of the front seat and the rear seat. It has.

  When supplementing about each part, the gas introduction part 28 is arrange | positioned in the substantially intermediate part of the vehicle airbag front-back direction of the upper edge of the curtain airbag 14. FIG. Therefore, in the vehicle mounted state, the inflator 12 is disposed on the vehicle upper side of the center pillar garnish 38. Further, by connecting the inflator 12 to the gas introduction part 28, when gas is generated from the inflator 12, the gas is introduced into the curtain airbag body 36 along the gas introduction part 28. .

  The gas introduction part 28 communicates with an intermediate part of the gas supply path 30 in the vehicle front-rear direction. Further, the front end portion 30A of the gas supply path 30 is positioned in front of the front pillar garnish 20 as viewed from the side of the vehicle, but the rear end portion 30B extends to a position overlapping the rear pillar garnish 22. In FIG. 2, the hatched range in the rear end portion 30B is a range in which the rear end portion 30B and the rear pillar garnish 22 overlap each other.

  The front side head protection chamber 32 is configured by arranging a plurality of cylindrical cells 32A, 32B, 32C, each having a longitudinal direction in the vehicle vertical direction, adjacent to each other in the vehicle front-rear direction. The upper ends of the cells 32A, 32B, and 32C are communicated with the gas supply path 30, respectively, and the cells 32A, 32B, and 32C are provided corresponding to the head protection area of the occupant seated in the front seat. Yes. Further, the lower end portion of the cell 32C arranged closest to the vehicle rear side in the front side head protection chamber 32 is extended to the center pillar garnish 38 side to form a cell extension portion 32D.

  On the other hand, the rear side head protection chamber 34 includes a single cell 34A provided corresponding to the head protection area of an occupant seated in the rear seat, and the cell 34A and the gas supply path 30 in an obliquely upward and downward direction of the vehicle. And a connection path 34B that communicates with each other, and is formed in a substantially J shape as a whole in a side view. The cell 34 </ b> A has a flat and substantially cylindrical shape similar to the cell 32 </ b> C arranged closest to the rear of the vehicle in the front side head protection chamber 32.

  The configuration of the cell 34A will be described in more detail. As shown in FIGS. 1 and 2, when the curtain airbag 14 is inflated and deployed, the rear end portion 30B of the gas supply passage 30 is arranged in the rear pillar garnish as described above. 22 is extended to a position overlapping with 22. The cell 34 </ b> A is spaced apart from the rear end 30 </ b> B of the gas supply path 30 on the vehicle lower side. Further, the rear side portion 34A1 of the cell 34A is disposed so as to overlap the rear pillar garnish 22 like the rear end portion 30B of the gas supply path 30. In FIG. 2, a hatched range in the cell 34 </ b> A is a range in which the cell 34 </ b> A and the rear pillar garnish 22 overlap. Further, the upper end portion 34A2 of the cell 34A is configured as a flat portion substantially parallel to the lower edge 30B1 of the rear end portion 30B of the gas supply path 30. That is, the upper end portion 34A2 of the cell 34A is not formed in an arc shape. In the above configuration, the rear head protection chamber 34 is configured by a single cell 34A. However, the rear head protection chamber 34 is not limited thereto, and the rear head protection chamber is configured by a plurality of cells in the same manner as the front head protection chamber 32. A chamber may be configured.

  Parts other than the gas introduction part 28, the gas supply path 30, the front side head protection chamber 32, and the rear side head protection chamber 34 in the curtain airbag main body 36 described above are non-inflatable parts 40 through which no gas flows. . Further, one end of a strap-like tension belt 42 is attached to the front end of the curtain airbag main body 36. The other end of the tension belt 42 is fixed to the front pillar.

≪Main part composition≫
A plurality of attachment pieces (attachment tabs) for attaching the airbag module 16 to the vehicle body are provided on the upper edge of the curtain airbag main body 36 described above. Hereinafter, for convenience of explanation, the mounting piece disposed at the rearmost side (the rearmost) in the vehicle front-rear direction is referred to as a “second mounting piece 46”, and the mounting piece disposed immediately in front thereof is referred to as the “first mounting piece 44”. The remaining attachment pieces other than the first attachment piece 44 and the second attachment piece 46 are referred to as “third attachment pieces 48”.

  2 and 3 (A), the first attachment piece 44 is a curtain air that is formed by folding a belt-like cloth piece twice so that the ends thereof are aligned and making it into a four-ply state. The curtain bag main body 36 is attached to the curtain airbag main body 36 by sewing the upper edge of the bag main body 36 with a sewing thread 49. A rectangular attachment hole 50 for inserting a fixture is formed in the upper center of the first attachment piece 44. Around the mounting hole 50 in the first mounting piece 44, a reinforcing portion 52 is provided that is sewn in a U shape with the vehicle lower side open.

  As shown in FIG. 2, the first mounting piece 44 described above is disposed at a position overlapping the reference line P along the vehicle vertical direction passing through the center O of the cell 34 </ b> A of the rear head protection chamber 34. In the present embodiment, the first mounting piece 44 is arranged so that the middle of the first mounting piece 44 in the width direction (vehicle longitudinal direction) is positioned on the reference line P. Further, the distance L1 from the upper edge of the curtain airbag main body 36 to the center of the mounting hole 50 of the first mounting piece 44 is such that the rear head protection chamber 34 is at an optimal height when the curtain airbag 14 is inflated and deployed. Is set to be positioned. That is, since the first mounting piece 44 is disposed at a position overlapping the reference line P along the vehicle vertical direction passing through the center O of the rear head protection chamber 34, It has a function of regulating the position in the direction.

  On the other hand, the second mounting piece 46 is arranged on the vehicle rear side (a position where the contribution of regulating the position of the rear head protection chamber 34 in the vehicle vertical direction is less) than the first mounting piece 44. In the present embodiment, the second mounting piece 46 is set at a position that does not overlap the gas supply path 30 in the vehicle vertical direction. In addition, the second attachment piece 46 is formed by folding a belt-like cloth piece once so that the end portions thereof are aligned and forming a two-layered state with a sewing thread 49 on the upper edge portion of the curtain airbag main body portion 36. By doing so, it is attached to the curtain airbag main body 36 (see FIG. 3B). A rectangular attachment hole 54 for inserting a fixture is formed in the upper center of the second attachment piece 46. It should be noted that the reinforcing portion 52 as set in the first mounting piece 44 is not set around the mounting hole 54 in the second mounting piece 46. Therefore, the strength of the second mounting piece 46 is set lower than that of the first mounting piece 44.

  Further, the distance L2 from the upper edge of the curtain airbag body 36 to the center of the mounting hole 54 of the second mounting piece 46 is the center of the mounting hole 50 of the first mounting piece 44 from the upper edge of the curtain airbag body 36. Is set longer than the distance L1. And the 1st attachment piece 44 and the 2nd attachment piece 46 from which length differs are attached to substantially the same height with respect to the vehicle body. It should be noted that the “same height” in claim 4 includes the case where they are completely the same height, as well as the case where they are slightly deviated.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.
An air bag module 16 of the vehicle curtain airbag device 10 is disposed on the back side of the end 18A of the roof head lining 18 on the outer side in the vehicle width direction. From this state, for example, when a side collision occurs, a side collision is detected by a side collision sensor (not shown) disposed on the side of the vehicle body. As a result, a predetermined current is applied to the squib (ignition device) of the inflator 12 by a controller (not shown). As a result, the inflator 12 is activated and a large amount of gas is generated. This gas is introduced from the gas introduction part 28 of the curtain airbag body 36 and introduced into the curtain airbag body 36. Specifically, after being supplied to the gas supply passage 30 of the curtain airbag main body 36, the cells 32A, 32B, 32C, the cell extension 32D, and the rear head protection chamber 34 of the front head protection chamber 32 are provided. It flows into the connection path 34B and the cell 34A, respectively. As a result, the curtain airbag body 36 is inflated and deployed in a curtain shape along the front seat side window 24 and the rear seat side window 26 from the end 18A in the vehicle width direction of the roof head lining 18.

  By the way, when the curtain airbag main body 36 is inflated and deployed in a curtain shape, the curtain airbag main body 36 is contracted substantially in the vehicle front-rear direction. That is, when gas is supplied to each cell 32A, 32B, 32C of the front side head protection chamber 32, cell extension 32D, and cell 34A of the back side head protection chamber 34, these cells 32A, 32B, 32C, cell The extension 32D and the cell 34A swell in a cylindrical shape. For this reason, the curtain airbag main body part 36 is pulled and contracted in the vehicle front-rear direction toward the gas introduction part 28 side. As a result, the first mounting piece 44 disposed immediately above the rear head protection chamber 34 located away from the gas introduction portion 28 in the vehicle longitudinal direction rear side and the second mounting piece disposed on the vehicle rear side thereof. 46 is pulled to the gas introduction part 28 side.

  Here, in this embodiment, since the strength of the second mounting piece 46 is lower than that of the first mounting piece 44, even if the second mounting piece 46 is temporarily cut when a peak load is applied, the second mounting piece 46 is more in the first mounting piece. Cut before 44. For this reason, the input to the 1st attachment piece 44 is reduced (namely, the load burden of the 1st attachment piece 44 is reduced), and it is prevented that the 1st attachment piece 44 cuts. As a result, the positional relationship in the vehicle vertical direction between the attachment point of the first attachment piece 44 to the vehicle body and the rear head protection chamber 34 is maintained, and the rear head protection chamber 34 expands at the intended position. Maintain the deployed state.

  Moreover, since it is the structure which changes the intensity | strength setting of the 1st attachment piece 44 and the 2nd attachment piece 46 which are arrange | positioned in the position which overlaps with the above-mentioned reference line P, all the attachment pieces are reinforced like the prior art mentioned above. do not have to. For this reason, even if the curtain airbag main-body part 36 is folded, it will not be bulky.

  As described above, the curtain airbag device 10 for a vehicle according to the present embodiment can satisfactorily exhibit the desired head protection performance of the curtain airbag 14 and can also be stored in the folded curtain airbag 14. It can be maintained well.

  In the present embodiment, since the second mounting piece 46 is set at a position that does not overlap the gas supply path 30 in the vehicle front-rear direction, the second mounting piece 46 is positioned away from the terminal end of the gas supply path 30 in the vehicle front-rear direction. The piece 46 is arranged. For this reason, when the curtain airbag main body portion 36 is contracted in the vehicle front-rear direction, the second attachment piece 46 is compared with the case where the second attachment piece 46 is set at a position overlapping the gas supply path 30 in the vehicle front-rear direction. 46 receives a greater tensile force. Accordingly, the second mounting piece 46 exhibits an appropriate fuse effect, and the second mounting piece 46 bears more load applied to the first mounting piece 44. As a result, according to the present embodiment, the load bearing effect of the first mounting piece 44 by the second mounting piece 46 can be effectively exhibited, and as a result, the reliability with respect to the fracture preventing effect of the first mounting piece 44 can be enhanced. .

  Furthermore, in the present embodiment, the distance L2 from the upper end of the curtain airbag main body portion 36 in the second mounting piece 46 to the center of the mounting hole 54 is from the upper end of the curtain airbag main body portion 36 in the first mounting piece 44. It is set longer than the distance L1 to the center of the mounting hole 50. And the 1st attachment piece 44 and the 2nd attachment piece 46 are being fixed to the vehicle body in the position used as substantially the same height. Therefore, if the length relationship is set so that the first mounting piece 44 and the second mounting piece 46 receive a tensile load at substantially the same timing, the same load is applied to the first mounting piece 44 and the second mounting piece. 46 can be almost equally burdened. That is, the load burden on the first mounting piece 44 and the second mounting piece 46 is ½ each. As a result, according to the present embodiment, the first attachment piece 44 can be made more difficult to cut.

[Supplementary explanation of the above embodiment]
In the embodiment described above, the second mounting piece 46 is set at a position that does not overlap the gas supply path 30 in the vehicle vertical direction. However, in relation to the invention according to claim 1, the second mounting piece 46 is connected to the gas supply path 30. And a configuration set at a position overlapping in the vehicle vertical direction.

  On the other hand, in the above-described embodiment, the setting position of the second mounting piece 46 is defined by the relationship with the gas supply path 30. However, the present invention is not limited to this. Position that does not overlap with the head protection part (the rear side head protection chamber when viewed in the same manner as in the above embodiment) closest to the end of the vehicle (in the same manner as in the above embodiment) You may take the structure set to.

  According to the said structure, a 2nd attachment piece will be arrange | positioned in the position spaced apart in the vehicle front-back direction from the terminal end of the head protection chamber. For this reason, when the curtain airbag main body is contracted in the vehicle front-rear direction, the second mounting piece is compared to the case where the second mounting piece is set at a position overlapping the head protection chamber in the vehicle front-rear direction. Receives greater tensile force. Thereby, the second mounting piece exhibits an appropriate fuse effect, and the second mounting piece bears more load applied to the first mounting piece. As a result, the load bearing effect of the first mounting piece by the second mounting piece can be effectively exhibited, and as a result, the reliability with respect to the fracture preventing effect of the first mounting piece can be enhanced.

  In the above-described embodiment, the present invention is applied to the first mounting piece 44 and the second mounting piece 46 that are mounting pieces disposed on the vehicle rear side. However, the present invention is not limited thereto, and the first mounting piece 44 and the second mounting piece 46 are disposed on the vehicle front side. The present invention may be applied to the mounting piece.

  Furthermore, in the above-described embodiment, the first mounting piece 44 has a four-ply structure and the reinforcement portion 52 by sewing is added to give a difference in strength from the second mounting piece 46. Any configuration that can set the strength of the first mounting piece relatively high with respect to the second mounting piece is applicable. For example, eyelets may be set at the peripheral edge of the mounting hole 50 of the first mounting piece 44.

  In the above-described embodiment, the first mounting piece 44 is disposed at a position where the middle in the width direction of the first mounting piece 44 overlaps the reference line P along the vehicle vertical direction passing through the center O of the rear head protection chamber 34. However, the present invention is not limited to this, and the first mounting piece may be displaced in the vehicle front-rear direction as long as the first mounting piece overlaps the reference line P.

  Further, in the above-described embodiment, the case where the vehicle curtain airbag device 10 is activated at the time of a side collision has been described as an example. However, the present invention is not limited to this, and the vehicle curtain airbag device is also activated at the time of rollover. There may be.

  Next, an aspect in the case where attention is paid to the shape and structure of the rear head protection chamber 34 will be mentioned.

(Background technology and issues)
In order to improve the head protection performance of the occupant seated in the rear seat at the time of a side collision, a vehicle curtain airbag device including a curtain airbag that is inflated and deployed across the front and rear seats may be provided. In this case, when the curtain airbag is inflated and deployed to the vehicle lower side, the rear pillar garnish may not be sufficiently bent, which may hinder the deployability of the curtain airbag. Therefore, the rear end of the gas supply path formed along the upper edge of the curtain airbag is overlapped with the rear pillar garnish in the vehicle front-rear direction, so that the rear garnish is pushed open by using the expansion force of the rear end. I have to.
However, with the above configuration, when the shape of the upper end of the rear head protection chamber arranged on the vehicle lower side of the rear end portion of the gas supply path has an arc shape, There is a problem that stress concentrates on a portion closest to the lower edge of the end (the apex portion of the chamber).
In consideration of the above fact, the present aspect is configured so that the end portion of the gas supply path is overlapped with the pillar garnish in the vehicle front-rear direction and the head protection chamber is disposed on the vehicle lower side of the end portion. It is an object to obtain a curtain airbag device for a vehicle that can alleviate stress concentration on the upper end of the vehicle.

(Configuration 1)
An inflator that generates gas when activated;
A gas introduction part into which the gas from the inflator is introduced; a head protection chamber that is in communication with the gas introduction part and that is inflated and deployed between the head of the seated occupant and the side window while being supplied with the gas; , And is stored in a folded state on the back side of the end of the roof head lining in the vehicle width direction, and in the form of a curtain along the side window from the end of the roof head lining in the vehicle width direction by gas supply. A curtain airbag body to be inflated and deployed;
Have
The rear end part of the gas introduction part is arranged so as to overlap with the pillar garnish, and the head protection chamber is arranged at a position separated from the rear end part of the gas introduction part on the vehicle lower side. ,
Furthermore, the upper end portion of the head protection chamber is a flat portion substantially parallel to the lower edge of the rear end portion of the gas introduction portion.
Curtain airbag device for vehicles.

(Action / Effect)
According to the above configuration, since the upper end portion of the head protection chamber is a flat portion that is substantially parallel to the lower edge of the rear end portion of the gas introduction portion, the upper end portion has an arc shape. In comparison, stress is less likely to concentrate. That is, the curtain air bag device for a vehicle according to the present aspect overlaps the end portion of the gas supply path with the pillar garnish in the vehicle front-rear direction and the head protection chamber is disposed on the vehicle lower side of the end portion. Stress concentration on the upper end of the head protection chamber can be reduced.
The above effects are further spread on the following effects. That is, since stress concentration on the upper end of the head protection chamber can be reduced, the head protection chamber can be brought closer to the gas supply path. For this reason, the expansion area | region (head protection area) of a head protection chamber can be expanded to the vehicle upper side, and the head protection performance of a seated passenger can be improved.
The above aspect is applicable not only on the rear pillar side but also on the front pillar side.

DESCRIPTION OF SYMBOLS 10 Vehicle curtain airbag apparatus 12 Inflator 14 Curtain airbag 28 Gas introduction part 30 Gas supply path 32 Front side head protection chamber 34 Rear side head protection chamber 36 Curtain airbag main-body part 44 1st attachment piece 46 2nd attachment piece 50 mounting hole 52 mounting hole O center of the head protection chamber P reference line along the vehicle vertical direction passing through the center of the head protection chamber L1 center of the mounting hole from the upper end of the curtain airbag body in the first mounting piece
Distance to L2 The center of the mounting hole from the upper end of the curtain airbag body in the second mounting piece
Distance to

Claims (4)

An inflator that generates gas when activated;
A gas introduction part into which the gas from the inflator is introduced; a head protection chamber that is in communication with the gas introduction part and that is inflated and deployed between the head of the seated occupant and the side window while being supplied with the gas; , And is stored in a folded state on the back side of the end of the roof head lining in the vehicle width direction, and in the form of a curtain along the side window from the end of the roof head lining in the vehicle width direction by gas supply. A curtain airbag body to be inflated and deployed;
Provided at the upper end of the curtain airbag main body and for attachment to the vehicle body, along the vehicle vertical direction passing through the center of the head protection chamber at a position away from the gas introduction portion in the vehicle longitudinal direction. A first mounting piece disposed at a position overlapping the reference line;
The curtain airbag main body is provided at the upper end of the curtain airbag main body and is attached to the vehicle body. The curtain airbag main body is disposed on the vehicle front-rear direction end side with respect to the first attachment piece, and the first A second mounting piece having a lower strength than the mounting piece;
A curtain airbag device for a vehicle comprising: The curtain airbag main body includes a gas supply path that extends along an upper edge thereof and communicates with the gas inlet and the head protection chamber.
The second mounting piece is set at a position that does not overlap the gas supply path in the vehicle front-rear direction.
The curtain airbag device for a vehicle according to claim 1. The second mounting piece is set at a position that does not overlap the head protection chamber and the vehicle front-rear direction closest to the end of the curtain airbag main body in the vehicle front-rear direction.
The curtain airbag device for a vehicle according to claim 1. The first attachment piece and the second attachment piece have attachment holes for attachment to the vehicle body,
The distance from the upper end of the curtain airbag body in the second mounting piece to the center of the mounting hole is greater than the distance from the upper end of the curtain airbag body in the first mounting piece to the center of the mounting hole. Is set longer,
The first attachment piece and the second attachment piece are attached to the vehicle body at the same height.
The curtain airbag device for a vehicle according to any one of claims 1 to 3.

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