JP2018058553A - Curtain airbag device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent or effectively suppress a head rotational failure of a rear seat occupant during a side collision.SOLUTION: In a vehicular curtain airbag device 10, a rear seat chamber 34 of a curtain airbag 30 has a front section 34F fixed to a roof side rail 24 and a rear section 34R fixed to a rear header 27. Therefore, the rear section 34R side is inflated and deployed to a bent (inclined) shape to a vehicle width direction center side with respect to the front section 34F in the rear seat chamber 34. Thus, since a rebounding direction of a head H rushing in the rear seat chamber 34 becomes easy to be inclined to a vehicle front side with respect to a vehicle width direction by shock of a side collision, the rebounding head H comes into contact with a seat back 14B and a headrest 14H of a rear seat 14 and hardly rotates around an axis of a neck section N. Furthermore, since swing of the rear seat chamber 34 to the vehicle width direction outside is suppressed during the rush-in, rotation of the head H caused by the swing in a vehicle longitudinal direction view can be prevented or suppressed.SELECTED DRAWING: Figure 1

Description

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

  In the occupant head protection airbag device described in Patent Document 1 below, the rear end lower portion of the rear seat inflatable portion (rear seat chamber) of the curtain airbag is connected to the quarter pillar (C pillar via the rear strap). ). The rear side strap is normally housed outside the quarter pillar garnish (C pillar garnish) passenger compartment, and is pulled out and extended toward the passenger compartment side of the C pillar garnish when the curtain airbag is inflated and deployed. Thus, a tension line is formed substantially along the belt line on the lower side of the rear portion of the curtain airbag.

International Publication No. 2010/0889847

  By the way, when the head of the rear seat occupant enters the rear seat chamber at the time of a side collision of the vehicle, the rear seat chamber may swing outward in the vehicle width direction, and the head may rotate in the vehicle front-rear direction view. Such rotation of the head causes brain rotation failure (Brain Rotational Injury Criterion; so-called BrIC). In this regard, when the rear end lower portion of the rear seat chamber and the C pillar are connected via the rear strap as in the curtain airbag having the above configuration, swinging of the rear seat chamber to the outside in the vehicle width direction is suppressed. Is done.

  However, when the rear side strap as described above is applied, design considerations for drawing the rear side strap from the C pillar garnish are required when the curtain airbag is inflated and deployed, and the design around the C pillar garnish is restricted. . In addition, it is necessary to take measures to prevent cracking and scattering of the C pillar garnish. For this reason, the arrangement | positioning area | region of a rear side strap will be limited, and application of a rear side strap may be difficult.

  Further, the rear seat chamber is curved so that the surface on the center side in the vehicle width direction is more outward in the vehicle width direction on the vehicle rear side than the portion where the expansion width in the vehicle width direction is maximum. For this reason, depending on the location where the head of the rear seat occupant contacts the rear seat chamber, the rebound direction of the head rebounding from the rear seat chamber is inclined toward the vehicle rear side with respect to the vehicle width direction. As a result, the rebound head can easily come into contact with the seat back and headrest of the rear seat. At the time of this contact, the head receives frictional force from the seat back and the headrest and rotates around the axis of the neck, causing a head rotation obstacle.

  In consideration of the above-described facts, an object of the present invention is to provide a curtain airbag device for a vehicle that can prevent or effectively suppress a head rotation obstacle of a rear seat occupant during a side collision.

  The curtain airbag device for a vehicle according to the first aspect of the present invention is housed in a folded state at the upper end portion of the passenger compartment side portion, is inflated and deployed to the lower side of the vehicle upon receiving gas supply, and the head of the rear seat occupant A curtain airbag having a rear seat chamber that protects a portion against a side collision, wherein the rear seat chamber is fixed to the roof side rail at the front, and the rear portion is closer to the vehicle width direction than the roof side rail. It is fixed to the rear header at the center.

  According to the first aspect of the present invention, the curtain airbag housed in the folded state at the upper end of the passenger compartment side part is inflated and deployed by receiving a gas supply, for example, when a side collision of the vehicle is detected or predicted. The curtain airbag has a rear seat chamber that protects the head of the rear seat occupant (hereinafter sometimes simply referred to as “head”) against a side collision. The rear seat chamber has a front portion fixed to the roof side rail, and a rear portion fixed to the rear header at the vehicle width direction center side of the roof side rail.

  Therefore, the rear seat chamber expands and develops into a shape in which the rear side portion is bent (tilted) toward the vehicle width direction center side with respect to the front side. As a result, the rebound direction of the head that enters the rear seat chamber due to the impact of the side collision is easily inclined toward the vehicle front side with respect to the vehicle width direction, so that the rebound head contacts the seat back and the headrest of the rear seat. It becomes difficult to do. Therefore, it is possible to prevent or suppress the head from rotating around the axis of the neck with the contact. In addition, since the rear portion of the rear seat chamber is fixed to the rear header at the center side in the vehicle width direction from the roof side rail, the swing of the rear seat chamber to the outer side in the vehicle width direction when the head enters the rear seat chamber is prevented. It is suppressed. Thereby, it can prevent or suppress that a head rotates in the vehicle front-back direction view. As described above, according to the present invention, it is possible to prevent or effectively suppress the head rotation obstacle of the rear seat occupant during the side collision.

  According to a second aspect of the present invention, in the curtain airbag device for a vehicle according to the first aspect, the rear seat chamber in the folded state is bent at the rear side toward the center in the vehicle width direction with respect to the front side.

  In the invention according to claim 2, in the folded rear seat chamber, the rear portion side fixed to the rear header is bent toward the center in the vehicle width direction with respect to the front portion side fixed to the roof side rail. As a result, the rear side of the rear seat chamber is easily inflated and deployed into a shape that is bent (tilted) with respect to the front side.

  A curtain airbag device for a vehicle according to a third aspect of the present invention is the first or second aspect, wherein the rear seat chamber in the inflated and deployed state faces the head in the vehicle width direction. A valley portion that is recessed outward in the vehicle width direction in plan view is formed at the location.

  According to the third aspect of the present invention, the heads that enter the rear seat chamber in the inflated and deployed state can be brought into contact with the front and rear sides of the rear seat chamber via the valley portion. Thereby, compared with the case where the said valley part is not formed in a rear seat chamber, since the contact area of a rear seat chamber and a head can be expanded, energy absorption efficiency can be improved. In addition, since the valley portion is formed in the rear seat chamber, the capacity of the rear seat chamber can be reduced.

  The curtain airbag device for a vehicle according to a fourth aspect of the present invention is the curtain airbag device for a vehicle according to the second aspect, wherein a non-inflatable portion extending in the vehicle vertical direction is set in the vehicle longitudinal direction middle portion of the rear seat chamber in the inflated and deployed state. Has been.

  In the invention according to claim 4, since the non-expanding portion is set in the rear seat chamber, the rear seat chamber in the inflated and deployed state can be bent as set at the position of the non-expanding portion. Further, by adjusting (changing) the position in the vehicle longitudinal direction of the non-expanded portion with respect to the rear seat chamber in the inflated and deployed state, the position where the rear seat chamber is bent in the inflated and deployed state is adjusted (changed) in the vehicle longitudinal direction. can do. Thereby, the rebound direction of the head from the rear seat chamber is the same regardless of the direction of the head entering the rear seat chamber, which changes according to the difference in the form of side collision, such as MDB side collision and pole side collision. It becomes easy to adjust to be in the direction.

  A curtain airbag device for a vehicle according to a fifth aspect of the present invention is the curtain airbag device for a vehicle according to the first or second aspect, wherein the rear seat chamber has a non-inflatable portion extending in the vehicle front-rear direction when the rear seat chamber is inflated and deployed. Is set.

  According to the fifth aspect of the present invention, when the rear seat chamber is inflated and deployed, the upper and lower sides of the rear seat chamber through the non-expanded portion tend to expand so as to extend in the vehicle front-rear direction. As a result, the rear seat chamber in the inflated and deployed state is less likely to be bent at the vehicle front-rear direction intermediate portion, and is more likely to bend toward the vehicle width direction center side toward the vehicle rear side. Thereby, the rebound direction of the head from the rear seat chamber is the same regardless of the direction of the head entering the rear seat chamber, which changes according to the difference in the form of side collision, such as MDB side collision and pole side collision. It becomes easy to adjust to be in the direction.

  A curtain airbag device for a vehicle according to a sixth aspect of the present invention is the curtain air bag device according to any one of the third to fifth aspects, wherein the curtain airbag is in the folded state. The bending angle on the rear side with respect to the front side of the rear seat chamber is set to an obtuse angle.

  In the invention according to claim 6, for example, the gas can easily flow smoothly between the front side and the rear side in the folded rear seat chamber as compared with the case where the bending angle is set to be a right angle. Become. Thereby, it can prevent or suppress that the expansion | deployment speed | velocity | rate of expansion | swelling of a rear seat chamber becomes slow because the rear seat chamber of a folded state is bent.

  A curtain airbag device for a vehicle according to a seventh aspect of the present invention is the curtain air bag device according to any one of the first to sixth aspects, wherein the curtain airbag is located on the vehicle rear side with respect to the B pillar. And is inflated and deployed by receiving a gas supply from an inflator connected to the gas introduction passage.

  In the invention according to claim 7, since the gas introduction passage connected to the inflator in the curtain airbag is located on the vehicle rear side (rear seat side) with respect to the B pillar, the gas is promptly introduced into the rear seat chamber side. Can be supplied. As a result, it is possible to prevent or suppress the expansion / deployment speed of the rear seat chamber in which the rear portion is extended to the rear header side and fixed to the rear header.

  A curtain airbag device for a vehicle according to an eighth aspect of the present invention is the curtain air bag device according to any one of the first to seventh aspects, wherein the roof side rail extends from the upper edge of the front portion of the rear seat chamber. A fixed front tab extends, and a rear tab fixed to the rear header extends from an upper edge of the rear portion of the rear seat chamber, and the rear tab extends to the roof side rail. The front tab is fixed to the rear header above the vehicle, and the dimension in the vehicle vertical direction is set longer than that of the front tab.

  In the invention according to claim 8, the front tab fixed to the roof side rail extends from the upper edge portion of the front portion of the rear seat chamber, and from the upper edge portion of the rear portion of the rear seat chamber, A rear tab fixed to the rear header extends. The fixing position of the rear tab to the rear header is set on the vehicle upper side than the fixing position of the front tab to the roof side rail, but the rear tab is set to be longer in the vehicle vertical direction than the front tab. . Thereby, when the rear seat chamber is inflated and deployed, it is possible to prevent or suppress the rear side of the rear seat chamber from being lifted to the vehicle upper side with respect to the front side.

  As described above, the vehicle curtain airbag device according to the present invention can prevent or effectively suppress the head rotation obstacle of the rear seat occupant during a side collision.

It is a perspective view which shows the vehicle interior rear part of the motor vehicle to which the curtain air bag apparatus for vehicles which concerns on 1st Embodiment of this invention is applied, and is a figure which shows the inflated deployment completion state of a curtain airbag. It is a perspective view corresponding to FIG. 1 which shows the folded state (accommodated state) of a curtain airbag. FIG. 2 is a side view of a part of the configuration shown in FIG. 1 as viewed from the vehicle right side. It is the fragmentary sectional view which looked at a part of composition shown by Drawing 1 from the vehicles front side. FIG. 3 is a plan view of a part of the configuration shown in FIG. 2 as viewed from above the vehicle. FIG. 6 is a plan view corresponding to a part of FIG. 5 showing a state where the curtain airbag is inflated and deployed, and is a view for explaining a direction in which the head of the rear seat occupant rebounds from the rear seat chamber. It is a top view which shows the folding state of the curtain airbag in 1st Embodiment. FIG. 7B is a plan view corresponding to FIG. 7A showing the inflated and deployed state of the curtain airbag in the first embodiment, and is a view for explaining the direction in which the head of the rear seat occupant rebounds from the rear seat chamber. It is a top view corresponding to Drawing 7A and Drawing 7B which shows the state where the head of the backseat occupant rebounded from the backseat chamber in a 1st embodiment. It is the fragmentary sectional view which looked at a part of composition shown by Drawing 7A from the vehicles front side. It is the fragmentary sectional view which looked at a part of composition shown by Drawing 7B from the vehicles front side. It is the fragmentary sectional view which looked at a part of composition shown by Drawing 7C from the vehicles front side. It is a top view which shows the folding state of the curtain airbag in a comparative example. FIG. 9B is a plan view corresponding to FIG. 9A, showing the inflated and deployed state of the curtain airbag in the comparative example, and is a view for explaining the direction in which the head of the rear seat occupant rebounds from the rear seat chamber. FIG. 10 is a plan view corresponding to FIG. 9A and FIG. 9B showing a state where the head of the rear seat occupant is in contact with the seat back of the rear seat in the comparative example. It is the fragmentary sectional view which looked at a part of composition shown in Drawing 9A from the vehicles front side. It is the fragmentary sectional view which looked at a part of composition shown by Drawing 9B from the vehicles front side. It is the fragmentary sectional view which looked at a part of composition shown in Drawing 9C from the vehicles front side. It is a side view corresponding to a part of Drawing 3 showing the state of inflation and deployment of a curtain airbag in a curtain airbag device for vehicles concerning a 2nd embodiment of the present invention. It is the top view which looked at the folded state of the curtain airbag which concerns on 2nd Embodiment from the vehicle upper side. It is a side view corresponding to FIG. 11A which shows the modification of the curtain airbag which concerns on 2nd Embodiment. It is the top view which looked at the curtain airbag shown by FIG. 12A from the vehicle upper side. It is a side view corresponding to a part of Drawing 3 showing the inflated deployment state of the curtain airbag in the curtain airbag device for vehicles concerning a 3rd embodiment of the present invention. It is the top view which looked at the curtain airbag shown by FIG. 13A from the vehicle upper side. FIG. 4 is a side view corresponding to a part of FIG. 3 for explaining a case where a lap amount between a rear seat chamber and a roof head lining is large. It is sectional drawing which looked at the accommodation state of the backseat chamber from the vehicle width direction center side. It is sectional drawing corresponding to FIG. 14B which shows the state of the expansion | deployment initial stage of a rear seat chamber. It is sectional drawing corresponding to FIG. 14B and FIG. 14C which show the state which the expansion | deployment expansion | deployment of the rear seat chamber advanced rather than the state shown by 14C. FIG. 6 is a plan view corresponding to a part of FIG. 5 showing an example in which the bending angle of the rear side with respect to the front side of the rear seat chamber is set to an obtuse angle in the folded curtain airbag.

<First Embodiment>
Hereinafter, the curtain airbag device 10 for a vehicle according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8C. In each figure, some symbols may be omitted for easy understanding of the drawing. In addition, arrow FR, arrow UP, and arrow OUT, which are appropriately shown in each figure, respectively indicate the forward direction (traveling direction), the upward direction, and the vehicle width direction outside of the automobile (vehicle) 12 to which the vehicle curtain airbag device 10 is applied. Is shown. Hereinafter, when simply using the front-rear, left-right, and up-down directions, unless otherwise specified, the front-rear direction of the vehicle, the left-right direction of the vehicle left-right direction (vehicle width direction), and the up-down direction of the vehicle are shown. To do.

(Overall configuration of curtain airbag device 10 for vehicle)
As shown in FIGS. 1 to 8C, the vehicle curtain airbag device 10 according to the present embodiment is mounted on a sedan type automobile 12, and includes a curtain airbag 30, an inflator 50, a control device 52, and the like. It has. 1, 2, and 6 to 8 </ b> C, a dummy P for a collision test is seated on the rear seat 14 of the automobile 12 instead of an actual occupant. The dummy P is, for example, AM50 (50th percentile of an American adult male) of an international unified side collision dummy (WorldSID). The dummy P is seated on the rear seat 14 by a seating method defined in the side collision test method. The rear seat 14 includes a seat back 14H and a headrest 14H. The dummy P is equipped with a seat belt of a three-point seat belt device (not shown) provided in the rear seat 14. Hereinafter, this dummy P is referred to as “rear seat occupant P”.

  As shown in FIGS. 2 and 5, the curtain airbag 30 is folded in the vertical direction of the vehicle so as to be elongated, and the inflator 50 is attached to the roof side portion 22 that is the upper end portion of the side portion of the passenger compartment. Stored together. The curtain airbag 30 is folded in a predetermined folding manner including at least one of roll folding and bellows folding, for example. In the stored state of the curtain airbag 30, the curtain airbag 30 extends from the A pillar side (not shown) to the C pillar 26 side over the roof side portion 22, and the curtain airbag 30 and the inflator 50 are not shown. It is the structure covered from the vehicle interior side. The curtain airbag 30 will be described in detail later.

  The inflator 50 is a gas generator for supplying gas into the curtain airbag 30, and is disposed on the roof side portion 22 on the rear side of the vehicle with respect to the B pillar 18, and the roof side rail 24 via a bracket (not shown). It is fixed to. A gas ejection portion of the inflator 50 is connected to a gas introduction passage 38 provided at a middle portion in the longitudinal direction of the curtain airbag 30. When the inflator 50 is activated, the gas ejected from the gas ejection section is supplied into the curtain airbag 30. Thus, the curtain airbag 30 is inflated and deployed in a curtain shape toward the vehicle lower side while bending the terminal portion of the roof head lining toward the vehicle lower side, and the front side glass 16, the B pillar 18, the rear side provided on the vehicle side portion. The glass 20 and the C pillar 26 are configured to be covered from the vehicle interior side.

  1C, the left side portion of the rear portion of the passenger compartment of the automobile 12 is illustrated. However, the curtain airbag 30 and the inflator 50 are provided on both the left and right sides of the automobile 12, respectively. That is, the vehicle curtain airbag device 10 includes a pair of left and right curtain airbags 30 and a pair of left and right inflators 50. The left and right inflators 50 are electrically connected to an ECU (Electronic Control Unit) 54 shown in FIG. The ECU 54 is electrically connected with a side collision sensor 56, a rollover sensor 58, and an oblique collision sensor 60. The ECU 54, the side collision sensor 56, the rollover sensor 58, and the oblique collision sensor 60 (all of which are not shown in FIG. 3) constitute a control device 52.

  The side collision sensor 56 is configured to detect or predict a side collision of the automobile 12 and output a side collision signal to the ECU 54. The rollover sensor 58 is configured to detect or predict a rollover of the automobile 12 and output a rollover signal to the ECU 54. The oblique collision sensor 60 is configured to detect or predict an oblique collision of the automobile 12 and output an oblique collision signal to the ECU 54.

  The ECU 54 is configured to operate the inflator 50 on the side collision side or the oblique collision side (both near side) when the side collision signal or the oblique collision signal is input. As a result, the near-side curtain airbag 30 is inflated and deployed upon receiving gas supply. Further, the ECU 54 is configured to operate the inflators 50 on both sides in the vehicle width direction when a rollover signal is input. The ECU 54 operates the inflator 50 on the opposite side (far side) to the already operated near side when a rollover signal is input after a side collision or an oblique collision.

(Configuration of curtain airbag 30)
The curtain airbag 30 described above is integrally woven into a bag by, for example, a One Piece Woven method abbreviated as OPW. In the OPW system, a non-sewn bag is formed by weaving two pieces of cloth at the same time using a jacquard loom while simultaneously weaving the necessary portions. The method for manufacturing the curtain airbag 30 is not limited to the above. For example, the curtain airbag 30 may be manufactured by sewing one or a plurality of base fabrics formed by cutting out a nylon or polyester fabric material into a bag shape.

  The curtain airbag 30 includes a front seat chamber 32, a rear seat chamber 34, and a gas distribution passage 36 that allows the front seat chamber 32 and the rear seat chamber 34 to communicate with each other. The front seat chamber 32 is inflated and deployed between the head of the front seat occupant (not shown) and the vehicle compartment side (front side glass 16), and protects (restraints; the same applies hereinafter) in the event of a side collision. ) The rear seat chamber 34 is inflated and deployed between the head H of the rear seat occupant P and the passenger compartment side (the rear side glass 20 and the C pillar garnish 26A), and the head H of the rear seat occupant P in a side collision. Protect. The gas distribution passage 36 is provided in the upper part of the curtain airbag 30 and connects the upper part of the front seat chamber 32 and the upper part of the rear seat chamber 34 to each other. From the upper end portion of the gas distribution passage 36, the above-described gas introduction passage 38 extends upward and rearward. The gas introduction passage 38 is located on the vehicle rear side with respect to the B pillar 18.

  The curtain airbag 30 having the above configuration has a plurality of tabs 40 extending from the upper edge portion. These tabs 40 include a front tab 40F extending from the upper edge of the front portion 34F of the rear seat chamber 34 and a rear tab 40R extending from the upper edge of the rear portion 34R of the rear seat chamber 34. include. The rear tab 40R is fixed to a rear end cross member (not shown) provided on the rear header 27 by means such as bolt fastening or clip fastening. Of the plurality of tabs 40, tabs 40 (including the front tab 40F) other than the rear tab 40R are fixed to the roof side rail 24 by the same means as described above.

  That is, in the present embodiment, the rear seat chamber 34 of the curtain airbag 30 has the front portion 34F fixed to the roof side rail 24, while the rear portion 34R is located on the rear header 27 at the center side in the vehicle width direction relative to the roof side rail 24. It is fixed. Further, the fixing position of the rear tab 40R to the rear header 27 is set on the vehicle upper side with respect to the fixing position of the front tab 40F to the roof side rail 24, and the rear tab 40R is in the vehicle vertical direction with respect to the front tab 40F. The dimension of is set longer.

  In the folded state (stored state) of the curtain airbag 30, as shown in FIGS. 2 and 5, the rear portion 34R side of the rear seat chamber 34 is bent toward the vehicle width direction center side with respect to the front portion 34F side. It has become. That is, the folded rear seat chamber 34 has a front / rear extension 34A extending in the vehicle front-rear direction and a center extension 34B extending from the rear end of the front / rear extension 34A toward the center in the vehicle width direction. A portion between the front and rear extending portion 34A and the central extending portion 34B is a bent portion (bent portion) 34C. The front / rear extension part 34A includes all or part of the front part 34F, and the center extension part 34B includes all or part of the rear part 34R. The central extension 34B is disposed near the front of the vehicle at the upper end of the rear glass 29 (see FIGS. 1, 2, and 5).

  When the curtain airbag 30 is in an inflated and deployed state, the rear portion 34R side of the rear seat chamber 34 is bent (tilted) toward the vehicle width direction center side with respect to the front portion 34F side. In this state, the front portion 34F of the rear seat chamber 34 is arranged on the outer side in the vehicle width direction with respect to the head H of the rear seat occupant P, and the rear portion 34R of the rear seat chamber 34 is on the vehicle rear side with respect to the head H. It is arranged outside in the vehicle width direction. Further, as shown in FIG. 3, the rear seat chamber 34 in the inflated and deployed state is configured such that the rear portion 34R overlaps the C pillar 26 in a side view of the vehicle.

  Further, in the rear seat chamber 34 in the inflated and deployed state, a valley (concave portion) 34V that is recessed outward in the vehicle width direction in a plan view at a position facing the head H of the rear seat occupant P in the vehicle width direction. Is formed. Then, in the rear seat chamber 34 in the inflated and deployed state, the surface facing the head width H of the rear seat occupant P in the vehicle width direction is such that the portion on the vehicle rear side with respect to the valley portion 34V moves toward the vehicle front side. The curved surface 34 </ b> R <b> 1 is curved so as to be directed outward in the vehicle width direction (reference numerals are omitted except for FIGS. 1 and 6). Note that the shape of the rear seat chamber 34 in the inflated and deployed state can be confirmed by, for example, supplying air into the curtain airbag 30 by an air pump or the like at normal times to inflate the curtain airbag 30.

(Function and effect)
Next, the operation and effect of the first embodiment will be described.

  In the curtain airbag device 10 for a vehicle having the above configuration, when a side collision of the automobile 12 is detected or predicted by the side collision sensor 56, the inflator 50 is operated by the ECU 54. As a result, the gas from the inflator 50 is supplied to the front seat chamber 32 and the rear seat chamber 34 through the gas introduction passage 38 and the gas distribution passage 36. As a result, the front seat chamber 32 is inflated and deployed between the head of the front occupant and the front side glass 16, and the rear seat chamber 34 is formed between the head H of the rear occupant P, the rear side glass 20, and the C pillar garnish 26A. It expands and expands in between.

  The rear seat chamber 34 has a front portion 34 </ b> F fixed to the roof side rail 24, and a rear portion 34 </ b> R fixed to the rear header 27 closer to the center in the vehicle width direction than the roof side rail 24. For this reason, the rear seat chamber 34 is inflated and deployed in a shape in which the rear portion 34R side is bent (tilted) toward the vehicle width direction center side with respect to the front portion 34F side. As a result, the rebound direction of the head H that enters the rear seat chamber 34 due to the impact of the side collision is easily inclined toward the vehicle front side with respect to the vehicle width direction. It becomes difficult to contact 14B and headrest 14H. Therefore, it is possible to prevent or suppress the head H from rotating around the axis of the neck N with the contact.

  Moreover, since the rear portion 34R of the rear seat chamber 34 is fixed to the rear header 27 at the center in the vehicle width direction from the roof side rail 24, the vehicle in the rear seat chamber 34 when the head H enters the rear seat chamber 34. Swing outward in the width direction is suppressed. Thereby, it can prevent or suppress that head H rotates in the vehicle front-back direction view. From the above, according to the present embodiment, it is possible to prevent or effectively suppress the head rotation obstacle of the rear seat occupant P at the time of a side collision.

  The above effect will be supplementarily described with reference to FIGS. 7A to 10C. 9A to 10C show a vehicle curtain airbag device 100 (hereinafter referred to as “comparative example 100”) according to a comparative example. In addition, in FIG. 9A-FIG. 10C, the same code | symbol is attached | subjected to the structure similar to this embodiment. In the curtain airbag 102 provided in the comparative example 100, the rear portion 104R of the rear seat chamber 104 is not fixed to the rear header 27 as in the present embodiment, but is fixed to a C pillar (not shown in FIGS. 9A to 10C). ing. As shown in FIG. 9C, the rear seat chamber 104 has a vehicle width as the surface 104A on the center side in the vehicle width direction is closer to the vehicle rear side than the portion where the expansion width in the vehicle width direction is maximum. It is configured to curve so as to go outward in the direction. In the comparative example 100, the configuration other than the above is the same as that of the present embodiment.

  In this comparative example 100, the head H (see arrow M in FIGS. 9A and 10A) of the rear seat occupant P that moves inertially outward in the vehicle width direction due to the impact of the side collision enters the rear seat chamber 104 that has been inflated and deployed. (See FIGS. 9B and 10B). At this time, depending on the location where the head H comes into contact with the rear seat chamber 104, the rebound direction of the head H rebounding from the rear seat chamber 104 is inclined toward the vehicle rear side with respect to the vehicle width direction (see arrow RB2 in FIG. 9B). ). As a result, as shown in FIG. 9C, the rebound head H comes into contact with the seat back 14B and receives a frictional force, whereby the rotational force around the axis of the neck N relative to the head H (the arrow in FIG. 9C). (See RO1). For this reason, a head rotation disorder (Brain Rotational Injury Criterion; so-called BrIC) may occur.

  In the comparative example 100, when the head H enters the rear seat chamber 104, the rear seat chamber 104 swings outward in the vehicle width direction (see arrow SW in FIG. 10B). As a result, as indicated by an arrow RO2 in FIG. 10B, the head H may rotate in the vehicle front-rear direction view. Such rotation of the head H causes a head rotation disorder (Brain Rotational Injury Criterion; so-called BrIC).

  Further, in this comparative example 100, the rear seat chamber 104 that rebounds (swings) with the head H to the center in the vehicle width direction during the rebound process from the rear seat chamber 104 causes the head H to move the head H toward the center in the vehicle width direction. There is a case of accelerating by keeping pushing. When the accelerated head H comes into contact with the seat back 14B, the rotational force RO1 acting on the head H increases.

  On the other hand, in the present embodiment, as in Comparative Example 100, the head H of the rear seat occupant P (see arrow M in FIGS. 7A and 8A) inflating and deploying is moved in the vehicle width direction by the impact of a side collision. Then, it enters the rear seat chamber 34 (see FIGS. 7B and 8B). The head H that has entered the rear seat chamber 34 receives a repulsive force from the rear 34R side of the rear seat chamber 34 toward the vehicle front side, so that the rebound direction of the head H changes between the vehicle width direction center side and the vehicle front side. It becomes easier to face (see arrow RB1 in FIGS. 7B and 7C). Accordingly, as shown in FIG. 7C, the rebound head H is unlikely to come into contact with the seat back 14B or the headrest 14H of the rear seat 14.

  Further, in the present embodiment, when the head H enters the rear seat chamber 34, the rear seat chamber 34 tries to swing outward in the vehicle width direction. At this time, the rear header 27 is interposed via the rear tab 40R. A rear portion 34R of the rear seat chamber 34 fixed to the rear receives a reaction force F (tensile force; see FIG. 8B) from the rear header 27 to the vehicle upper side. Thereby, since the swing to the vehicle width direction outer side of the rear seat chamber 34 is suppressed, rotation of the head H resulting from the said swing can be prevented or suppressed.

  Further, in the present embodiment, when the rear seat chamber 34 rebounds (swings) to the vehicle width direction center side together with the head H, the rear portion 34R of the rear seat chamber 34 abuts against the rear header 27, whereby the rear seat chamber 34 Swing to the center in the vehicle width direction is suppressed (restricted). Thereby, the head H can be prevented or suppressed from being accelerated by being pushed by the rear seat chamber 34.

  In the occupant head protection airbag device described in the background art section, the rear end lower portion of the rear seat chamber and the C pillar are connected via a rear strap. Since the rear strap suppresses swinging of the rear seat chamber toward the center in the vehicle width direction, acceleration of the head H as in the comparative example 100 can be prevented or suppressed. However, when the rear side strap as described above is applied, design considerations for drawing the rear side strap from the C pillar garnish are required when the curtain airbag is inflated and deployed, and the design around the C pillar garnish is restricted. . In addition, it is necessary to take measures to prevent cracking and scattering of the C pillar garnish. For this reason, the arrangement | positioning area | region of a rear side strap will be limited, and application of a rear side strap may be difficult. In this regard, in the present embodiment, the swing can be regulated (suppressed) without using the rear strap. As a result, it is possible to accelerate the rear seat chamber 34 by continuously pushing the head H of the rear seat occupant P toward the center in the vehicle width direction while eliminating the need for design consideration for pulling out the rear strap from the C pillar garnish. Can be prevented or suppressed.

  Further, in the present embodiment, the rear seat chamber 34 in the folded state has the rear portion 34R side fixed to the rear header 27 bent toward the center in the vehicle width direction with respect to the front portion 34F side fixed to the roof side rail 24. Yes. As a result, the rear portion 34R side of the rear seat chamber 34 is easily inflated and deployed into a bent (tilted) shape with respect to the front portion 34F side.

  Further, in the present embodiment, the rear seat chamber 34 in the inflated and deployed state is formed with a valley portion 34V that is recessed outward in the vehicle width direction in a plan view at a location facing the head H in the vehicle width direction. The For this reason, the head H that enters the rear seat chamber 34 in the inflated and deployed state can be brought into contact with the front and rear portions of the rear seat chamber 34 via the valley portion 34V. As a result, the contact area between the rear seat chamber 34 and the head H can be increased as compared with the case where the valley portion 34V is not formed in the rear seat chamber 34 (see FIGS. 9B and 9C). Efficiency can be increased. In addition, since the valley portion 34 </ b> V is formed in the rear seat chamber 34, the capacity of the rear seat chamber 34 can be reduced.

  Further, in the present embodiment, the gas introduction passage 38 connected to the inflator 50 in the curtain airbag 30 is located on the vehicle rear side (rear seat side) with respect to the B pillar 18, so that the early stage toward the rear seat chamber 34 side. Can be supplied with gas. Accordingly, it is possible to prevent or suppress the expansion / deployment speed of the rear seat chamber 34 in which the rear portion 34R is extended toward the center in the vehicle width direction.

  Further, in the present embodiment, a front tab 40F fixed to the roof side rail 24 extends from the upper edge portion of the front portion 34F of the rear seat chamber 34, and the upper edge of the rear portion 34R of the rear seat chamber 34 is extended. A rear tab 40R fixed to the rear header 27 extends from the portion. The fixing position of the rear tab 40R to the rear header 27 is set on the vehicle upper side with respect to the fixing position of the front tab 40F to the roof side rail 24, but the rear tab 40R is a dimension in the vehicle vertical direction with respect to the front tab 40F. Is set longer. Thereby, when the rear seat chamber 34 is inflated and deployed, it is possible to prevent or suppress the rear portion 34R side of the rear seat chamber 34 from being lifted upward with respect to the front portion 34F side. In other words, since the rear portion 34R side of the rear seat chamber 34 is lifted as described above, there is no need to expand the rear portion 34R side of the rear seat chamber 34 in the inflated and deployed state to the vehicle lower side. It is possible to prevent the rear seat chamber 34, that is, the curtain airbag 30 from becoming larger (larger capacity).

  In the present embodiment, since the rear end portion of the folded curtain airbag 30 (the rear portion 34R side of the rear seat chamber 34) is not covered with the C pillar garnish 26A, the C pillar garnish is inflated when the rear seat chamber 34 is inflated and deployed. 26A can be prevented from being caught. In addition, it is easy to extend the rear end portion of the curtain airbag 30 as compared with the configuration in which the rear end portion of the curtain airbag 30 is covered with the C pillar garnish 26A. Further, the rear seat chamber 34 expands and develops in a shape in which the rear portion 34R side is bent toward the vehicle width direction center side with respect to the front portion 34F side. By adjusting this shape, it is possible to make the rear seat chamber 34 difficult to get caught by interior parts (seat back, trim, etc.) of the vehicle when inflated and deployed.

  In the present embodiment, the rear portion 34R of the rear seat chamber 34 in the inflated and deployed state is configured to overlap the C pillar 26 in a side view. For this reason, when the rear portion 34R hits the C pillar 26, the displacement of the rear seat chamber 34 to the outside in the vehicle width direction is restricted. Thereby, the out-of-vehicle discharge suppression performance of the rear seat occupant P in the rollover test (FMVSS226 standard) can be improved.

  Next, another embodiment of the present invention will be described. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol as the said 1st Embodiment is provided, and the description is abbreviate | omitted.

<Second Embodiment>
FIG. 11A shows a side view corresponding to a part of FIG. 3 of the inflated and deployed state of the curtain airbag 30 in the curtain airbag device 70 for a vehicle according to the second embodiment of the present invention. Further, FIG. 11B shows a folded state of the curtain airbag according to the second embodiment in a plan view as viewed from above the vehicle. In this embodiment, a non-inflatable portion 72 extending in the vehicle vertical direction is set in the vehicle longitudinal direction intermediate portion in the rear seat chamber 34 in the inflated and deployed state. The non-inflatable portion 72 is configured by a seam obtained by sewing the base fabric of the curtain airbag 30, for example. As shown in FIG. 11B, the non-inflatable portion 72 is set so as to be positioned at the bent portion 34 </ b> C of the rear seat chamber 34 in the folded state of the curtain airbag 30. In this embodiment, the configuration other than the above is the same as that of the first embodiment.

  Also in this embodiment, there are basically the same functions and effects as in the first embodiment. In this embodiment, since the non-expanding portion 72 is set in the rear seat chamber 34, the rear seat chamber 34 in the inflated and deployed state is positioned at the position of the non-expanding portion 72 (see a virtual line L in FIG. 11A). Can be bent as set. Further, as shown in FIGS. 12A and 12B, the rear seat chamber 34 is completely inflated and deployed by adjusting (changing) the position of the non-inflatable portion 72 in the vehicle longitudinal direction with respect to the rear seat chamber 34 in the inflated and deployed state. It is possible to adjust (change) the position of bending in the vehicle longitudinal direction (see virtual lines L1 to L3 in FIGS. 12A and 12B). Accordingly, the head H rebounds from the rear seat chamber 34 regardless of the direction in which the head H enters the rear seat chamber 34 that changes according to the difference in the form of side collision, such as MDB side collision or pole side collision. It becomes easy to adjust so that the direction becomes the same direction.

<Third Embodiment>
FIG. 13A shows a side view corresponding to a part of FIG. 3 showing the inflated and deployed state of the curtain airbag 30 in the curtain airbag device 80 for a vehicle according to the third embodiment of the present invention. 13B is a plan view of the curtain airbag 30 shown in FIG. 13A viewed from above the vehicle. In this embodiment, a non-inflatable portion 82 extending in the vehicle front-rear direction is set in the vehicle vertical direction intermediate portion in the rear seat chamber 34 in the inflated and deployed state. The non-inflatable portion 82 is constituted by, for example, a seam obtained by sewing the base fabric of the curtain airbag 30 and divides the rear seat chamber 34 into an upper portion 34U and a lower portion 34L. In this embodiment, the configuration other than the above is the same as that of the first embodiment.

  Also in this embodiment, there are basically the same functions and effects as in the first embodiment. In this embodiment, when the rear seat chamber 34 is inflated and deployed, the upper and lower portions 34U and 34L through the non-expandable portion 82 of the rear seat chamber 34 tend to expand so as to extend in the vehicle front-rear direction. As a result, the rear seat chamber 34 in the inflated and deployed state is less likely to bend at the vehicle front-rear direction intermediate portion, and is more likely to bend toward the vehicle width direction center side toward the vehicle rear side. Accordingly, the head H rebounds from the rear seat chamber 34 regardless of the direction in which the head H enters the rear seat chamber 34 that changes according to the difference in the form of side collision, such as MDB side collision or pole side collision. It becomes easy to adjust so that the direction becomes the same direction.

<Supplementary explanation of the embodiment>
In the second and third embodiments, the effects when the non-expanding portions 72 and 82 are set in the rear seat chamber 34 have been described. However, it may be preferable not to set the non-expanding portions 72 and 82. is there. That is, when the central extension 34B (see FIG. 5) in the folded rear seat chamber 34 largely wraps with respect to the roof head lining in the vehicle plan view, the non-inflatable portions 72 and 82 are set in the rear seat chamber 34. It is preferable not to. Specifically, for example, in the curtain airbag 30 shown in 14A, when a hatched portion wraps in a folded state of the curtain airbag 30 with a roof head lining in a vehicle plan view, the portion has a non-inflatable portion. Is preferably not set (see the non-inflatable portion 72 indicated by a two-dot chain line in FIG. 14A). That is, as shown in FIGS. 14B to 14D, the rear seat chamber 34 is inflated and deployed to the vehicle lower side while bending the terminal portion on the vehicle rear side of the roof head lining 28 to the vehicle lower side. Thus, the expansion and deployment performance of the rear seat chamber 34 is improved when the expansion of the rear seat chamber 34 is not suppressed.

  Further, in each of the above embodiments, the folded curtain airbag 30 is configured such that the bending angle on the rear portion 34R side with respect to the front portion 34F side of the rear seat chamber 34 is set to be a right angle or a substantially right angle. This is not a limitation. That is, as in the modified example shown in FIG. 15, the curtain airbag 30 in the housed state may be configured such that the bending angle θ on the rear portion 34R side with respect to the front portion 34F side of the rear seat chamber 34 is set to an obtuse angle. . Thereby, compared with the case where bending angle (theta) is set to a right angle or substantially right angle, gas becomes easy to flow smoothly between the front part 34F side and the rear part 34R side in the rear seat chamber 34 of a folding state. Thereby, it can prevent or suppress that the expansion | deployment speed | velocity of the rear seat chamber 34 becomes slow because the rear seat chamber 34 of a folded state is bent.

  Moreover, in each said embodiment, although the back tab 40R was set as the structure by which the dimension of the vehicle up-down direction was set longer than the front tab 40F, this invention is not limited to this, The back tab 40R and the front tab 40F You may make it the structure by which the dimension of the vehicle up-down direction was set equally.

  In each of the above embodiments, the gas introduction passage 38 of the curtain airbag 30 is disposed on the vehicle rear side of the B pillar 18. However, the present invention is not limited to this, and the gas introduction passage 38 is provided with the B pillar. It may be configured to be arranged on the upper side of the 18 vehicles or the front side of the vehicle.

  Moreover, although each said embodiment demonstrated the case where the curtain airbag apparatus 10, 70, 80, 90 for vehicles was applied to the sedan type motor vehicle 12 (vehicle), it is not restricted to this, The vehicle which concerns on this invention The curtain airbag device can be applied to a hatchback type vehicle or a three-row seat vehicle. In that case, the seat on the rearmost side of the vehicle is the rear seat according to the present invention.

  In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to the above embodiments.

DESCRIPTION OF SYMBOLS 10 Curtain airbag apparatus for vehicles 14 Rear seat 22 Roof side part (upper end part of vehicle compartment side part)
24 roof side rail 27 rear header 30 curtain airbag 34 rear seat chamber 34F front 34R rear 34V valley 38 gas introduction passage 40F front tab 40R rear tab 50 inflator 70 vehicle curtain airbag device 72 non-expandable section 80 vehicle curtain air Bag device 82 Non-inflatable part P Rear seat occupant H Head

Claims (8)

Curtain air that is housed in a folded state at the upper end of the passenger compartment side, is inflated and deployed to the vehicle lower side upon receiving gas supply, and has a rear seat chamber that protects the head of the rear seat occupant against side collisions Have a bag,
The rear seat chamber is a vehicle curtain airbag device in which a front portion is fixed to a roof side rail, and a rear portion is fixed to a rear header at a vehicle width direction center side of the roof side rail.   2. The curtain airbag device for a vehicle according to claim 1, wherein the rear seat chamber in the folded state is bent toward the center in the vehicle width direction with respect to the front side.   3. The valley portion that is recessed outward in the vehicle width direction in plan view is formed in the rear seat chamber in the inflated and deployed state at a location facing the head in the vehicle width direction. The curtain airbag device for vehicles described in 1.   The curtain air for a vehicle according to any one of claims 1 to 3, wherein a non-inflatable portion extending in a vehicle vertical direction is set in an intermediate portion in the vehicle longitudinal direction in the rear seat chamber in the inflated and deployed state. Bag device.   The curtain airbag device for a vehicle according to claim 1, wherein a non-inflatable portion extending in the vehicle front-rear direction is set at a vehicle vertical direction intermediate portion in the rear seat chamber in the inflated and deployed state.   The folded curtain airbag has a bend angle on the rear side with respect to the front side of the rear seat chamber set to an obtuse angle, or any one of claims 3 to 5 quoting claim 2. The curtain airbag device for a vehicle according to claim 1.   The curtain air bag has a gas introduction passage located on the vehicle rear side of the B pillar, and is inflated and deployed by receiving gas supply from an inflator connected to the gas introduction passage. The curtain airbag device for a vehicle according to claim 1. A front tab fixed to the roof side rail extends from the upper edge of the front part of the rear seat chamber,
A rear tab fixed to the rear header extends from the upper edge of the rear portion of the rear seat chamber,
2. The rear tab is fixed to the rear header on the vehicle upper side of a position where the front tab is fixed to the roof side rail, and the dimension in the vehicle vertical direction is set longer than the front tab. The curtain airbag device for a vehicle according to any one of claims 7 to 8.