JP2018094927A - Curtain airbag device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize restraint performance of a rear-seat side-collision chamber.SOLUTION: In a curtain airbag 30 of a curtain airbag device 10 for a vehicle, a rearmost tab 60R, which is fixed to a roof side rail 24 by extending from an upper edge part of a rear-seat side-collision chamber 34, includes a tab extension part 60R2. The tab extension part 60R2 connects with an upper edge part of a rear end part 34R of the rear-seat side-collision chamber 34 on the vehicle rear side rather than a fastener 62R. Therefore, the tensile force is applied to the tab extension part 60R2 when the inflated and deployed rear-seat side-collision chamber 34 oscillates to the vehicle front side. Thus, since an upper direction force F1 of the vehicle with respect to the rear end part 34R of the inflated and deployed rear-seat side-collision chamber 34 is applied, the inflated and deployed rear-seat side-collision chamber 34 is restrained from oscillating to the vehicle front side. As a result it becomes possible for the rear-seat side-collision chamber 34 to restrain a head part H of a passenger P on the rear seat at a position as designed.SELECTED DRAWING: Figure 1

Description

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

  The curtain shield airbag device described in the following Patent Document 1 includes an airbag portion (curtain airbag) that is inflated and deployed by receiving gas supply from an inflator. This curtain airbag is inflated and deployed in front of the vehicle in the rear main space (rear seat side collision chamber) and the rear seat side collision chamber, which restrains the head of the rear seat occupant at the time of a side collision. And a rear side subspace portion (rollover chamber) for restraining the portion at the time of rollover. Gas from the inflator is supplied to the rollover chamber via the rear seat side collision chamber. As a result, the rollover chamber begins to expand after the rear seat side collision chamber.

Japanese Patent Laying-Open No. 2015-168375

  In the curtain shield airbag apparatus configured as described above, the timing at which the head of the rear seat occupant is restrained by the rear seat-side collision chamber at the time of a side collision is the timing before the rollover chamber is completely inflated. At this timing, since the internal pressure of the rollover chamber is lower than the internal pressure of the rear seat side collision chamber, the low pressure rollover chamber is pushed by the high pressure rear seat side collision chamber and compressed in the longitudinal direction of the vehicle. The chamber may be displaced (swinged) forward of the vehicle. In this case, the rear seat side collision chamber cannot restrain the head of the rear seat occupant at the designed position, and the restraint performance becomes unstable. Note that the above-mentioned problem is that a curtain airbag of a type in which a non-inflatable portion made only of a base fabric is provided in front of the rear seat side collision chamber or the non-inflatable portion in front of the rear seat side collision chamber. This also occurs in curtain airbags of the type that are not provided with a rollover chamber.

  In view of the above fact, an object of the present invention is to provide a curtain airbag device for a vehicle that can stabilize the restraining performance of a rear seat side collision chamber.

  In the curtain airbag device for a vehicle according to the first aspect of the invention, a fixing tab extended from the upper edge portion is fixed to the roof side portion of the vehicle, and the head of the rear seat occupant and the compartment side portion are A rear seat side collision chamber inflated and deployed between the rear seat side collision chamber and a rear end portion of the rear seat side collision chamber inflated and deployed on the rear side of the vehicle with respect to a position fixed to the roof side portion in the rear seat side collision chamber A curtain air bag is provided that includes a swing suppressing portion that suppresses swing of the rear seat-side collision chamber toward the front side of the vehicle by applying an upward force of the vehicle.

  In the invention according to claim 1, the curtain airbag has the rear seat side collision chamber. In the rear seat side collision chamber, a fixing tab extending from the upper edge portion is fixed to the roof side portion of the vehicle. For example, when a side collision of the vehicle is detected or predicted, the rear seat side collision chamber is inflated and deployed between the rear seat passenger's head and the passenger compartment side. When the rear seat side collision chamber is inflated and deployed, the swing suppression portion is located above the rear end portion of the rear seat side collision chamber above the rear end portion of the rear seat side collision chamber on the vehicle rear side with respect to the fixed position to the roof side portion in the rear seat side collision chamber By applying the force of the direction, the swing of the rear seat side collision chamber to the vehicle front side is suppressed. As a result, the rear seat side collision chamber can restrain the head of the rear seat occupant at the designed position, so that the restraining performance (protection performance) of the rear seat side collision chamber can be stabilized.

  The 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 swing suppressing portion is a tab extension portion formed by extending the fixed tab toward the vehicle rear side.

  In the second aspect of the present invention, the fixed tab that extends from the upper edge portion of the rear seat side collision chamber and is fixed to the roof side portion is extended to the vehicle rear side to form a tab extension portion. For this reason, when the rear seat side collision chamber that has been inflated and deployed is about to swing toward the vehicle front side, a tension acts on the tab extension portion. As a result, the upward force of the vehicle can be applied to the rear end portion of the rear seat side collision chamber that has been inflated and deployed, so that the swing of the rear seat side collision chamber toward the vehicle front side is suppressed with a simple configuration. can do.

  According to a third aspect of the present invention, in the curtain airbag device for a vehicle according to the first or second aspect, the swing suppressing portion extends from a rear end portion of the rear seat side collision chamber, and the rear This is an extension chamber that inflates and deploys to the rear of the seat-side collision chamber and contacts the upper surface of the seatback of the rear seat.

  In the invention according to claim 3, the extension chamber extended from the rear end portion of the rear seat side collision chamber is inflated and deployed to the rear of the rear seat side collision chamber and contacts the upper surface of the seat back of the rear seat. . For this reason, when the rear seat side collision chamber that has been inflated and deployed attempts to swing toward the front side of the vehicle, the rear end portion of the rear seat side collision chamber is forced upward from the upper surface of the seat back via the extension chamber. In addition to receiving (reaction force), the rear seat side collision chamber receives a friction force directed toward the rear of the vehicle from the upper surface of the seat back through the extension chamber. Thereby, rocking | fluctuation to the vehicle front side of a rear seat side collision chamber can be suppressed with a simple structure.

  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 third aspect, wherein the extended and inflated extension chamber is sandwiched between the headrest of the rear seat and the C pillar garnish.

  In the invention according to the fourth aspect, the inflated and expanded extension chamber is sandwiched between the headrest of the rear seat and the C pillar garnish. For this reason, when the rear seat-side collision chamber that has been inflated and deployed is about to swing toward the front side of the vehicle, the rear end portion of the rear seat-side collision chamber is turned upward from the upper surface of the seat back via the extension chamber. In addition to receiving a force, the rear seat side collision chamber receives a friction force directed toward the rear of the vehicle from the headrest and the C pillar garnish in addition to the upper surface of the seat back through the extension chamber. Thereby, rocking | fluctuation to the vehicle front side of a rear seat side collision chamber can be suppressed more effectively.

  As described above, in the vehicle curtain airbag device according to the present invention, the restraining performance of the rear seat side collision chamber can be stabilized.

It is the side view which looked at the partial structure of the curtain airbag apparatus for vehicles which concerns on 1st Embodiment of this invention from the vehicle left side, and is a figure which shows the state in the middle of expansion | deployment of a curtain airbag. It is a side view which shows the state in the middle of inflation deployment of the curtain airbag. It is a side view which shows the structure of the upper edge part periphery in the rear seat side collision chamber before expansion | deployment expansion | deployment. It is a side view which shows the accommodation state of the curtain airbag shown by FIG. It is a side view corresponding to FIG. 1 which shows the state in the middle of inflation deployment of the curtain airbag which concerns on a comparative example. It is a plane sectional view for explaining the difference in the rebound direction of the head of a backseat crew member in a 1st embodiment and a comparative example. It is the side view which looked at the partial structure of the curtain airbag apparatus for vehicles which concerns on 2nd Embodiment of this invention from the vehicle left side, and is a figure which shows the state in the middle of expansion | deployment of a curtain airbag. It is an expanded sectional view which expands and shows the cut surface along the F8-F8 line | wire of FIG. It is an expanded sectional view which expands and shows the cut surface along the F9-F9 line | wire of FIG. FIG. 8 is an enlarged cross-sectional view showing an enlarged cut surface along the line F10-F10 in FIG. 7, for explaining rebound of the head of the rear seat occupant and the rear seat chamber. It is a side view corresponding to a part of Drawing 7 showing the 1st modification of a 2nd embodiment. It is a side view of the curtain airbag corresponding to a part of Drawing 7 showing the 2nd modification of a 2nd embodiment. It is a side view of the curtain airbag corresponding to a part of Drawing 7 showing the 3rd modification of a 2nd embodiment. It is a side view of the curtain airbag corresponding to a part of Drawing 7 showing the 4th modification of a 2nd embodiment.

<First Embodiment>
A curtain airbag device 10 for a vehicle according to a first embodiment of the present invention will be described with reference to FIGS. In addition, arrow FR, arrow UP, and arrow OUT that are appropriately described in each figure indicate the forward direction (traveling direction), the upward direction, and the width direction of the automobile (vehicle) 12 to which the vehicle curtain airbag device 10 is applied. Shows the direction. 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 4, 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 70, a control device 72, and the like. It has. 1 and 4, 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 vehicle seat 14 by a seating method defined in the side collision test method. Further, the dummy P is fitted 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 FIG. 1, the curtain airbag 30 is formed so as to be inflated and deployed in a curtain shape along the front side glass 16, the B pillar 18, and the rear side glass 20 provided on the side of the passenger compartment. A plurality of fixing tabs 60 are extended from the upper edge of the curtain airbag 30. These fixing tabs 60 are disposed on the roof side portion 22 which is the upper end portion of the side portion of the passenger compartment, and are fixed to the A pillar and the roof side rail 24 (not shown). The configuration of the curtain airbag 30 will be described in detail later.

  The inflator 70 is a gas generator for supplying gas into the curtain airbag 30 and is disposed in the vicinity of the intermediate portion in the front-rear direction of the curtain airbag 30 and is fixed to the roof side rail 24 via a bracket (not shown). Yes. The gas ejection portion of the inflator 70 is connected to a connection passage 37 provided in the middle portion in the longitudinal direction of the curtain airbag 30. When the inflator 70 is actuated, the gas ejected from the gas ejection section is supplied into the curtain airbag 30.

  1 and 4 show the right side portion in the rear part of the passenger compartment of the automobile 12, the curtain airbag 30 and the inflator 70 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 70. The left and right inflators 70 are electrically connected to an ECU (Electronic Control Unit) 73 shown in FIG. The ECU 73 is electrically connected to a side collision sensor 74, a rollover sensor 76, and a slant collision sensor 78. The ECU 73, the side collision sensor 74, the rollover sensor 76, and the oblique collision sensor 78 (all of which are not shown in FIG. 1) constitute a control device 72.

  The side collision sensor 74 is configured to detect or predict a side collision of the automobile 12 and output a side collision signal to the ECU 73. The rollover sensor 76 is configured to detect or predict a rollover of the automobile 12 and output a rollover signal to the ECU 73. The oblique collision sensor 78 is configured to detect or predict an oblique collision of the automobile 12 and output an oblique collision signal to the ECU 73.

  The ECU 73 is configured to operate the inflator 70 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 the gas supply. The ECU 73 is configured to operate the inflators 70 on both sides in the vehicle width direction when a rollover signal is input. The ECU 73 operates the inflator 70 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.

  As shown in FIG. 2, the curtain airbag 30 includes a front seat collision chamber 32, a rear seat collision chamber 34, and a front seat oblique projection chamber 31 provided on the front side of the front seat collision chamber 32. A gas supply passage 36 in which the front seat side collision chamber 32 and the rear seat side collision chamber 34 are communicated with each other, and a rollover provided between the front seat side collision chamber 32 and the rear seat side collision chamber 34. And a chamber 38. An outer peripheral non-inflatable portion 40 is provided on the outer peripheral edge portion of the curtain airbag 30. The outer peripheral non-inflatable portion 40 constitutes an upper edge portion, a lower edge portion, a front edge portion, and a rear edge portion of the curtain airbag 30. The curtain airbag 30 is provided with a plurality of non-inflatable portions 42, 44, 46, 48 for partitioning the chambers and the gas supply passage 36.

  The front seat side collision chamber 32 is inflated and deployed between a head portion of the front seat occupant (not shown) and the vehicle body side portion (front side glass 16), and restrains (protects; below) the head portion of the front seat occupant during a side collision. Same). The front seat oblique projection chamber 31 is inflated and deployed in front of the front seat side projection chamber 32, and restrains the head of the front seat occupant during an oblique collision and rollover. The front seat oblique projection chamber 31 is partitioned from the front seat side projection chamber 32 by a non-inflatable portion 42 extending in the vertical direction of the curtain airbag 30. Throttle channels 50 and 52 are formed between the non-inflatable portion 42 and the upper edge of the curtain airbag 30, and between the non-inflatable portion 42 and the lower edge of the curtain airbag 30, respectively. The front-seat obliquely projecting chamber 31 and the front-seat-side projecting chamber 32 are communicated with each other via the throttle channels 50 and 52.

  The rear seat side collision chamber 34 expands and deploys between the head H of the rear seat occupant P and the vehicle body side portion (rear side glass 20), and restrains the head H of the rear seat occupant P in the event of a side collision. The expansion width of the rear seat side collision chamber 34 in the vehicle width direction is set to be maximum at the rear side of the vehicle with respect to the center of gravity of the head H of the rear seat occupant P when the curtain airbag 30 is inflated and deployed. ing. Note that the positional relationship between the expansion width and the center of gravity of the head H is such that, for example, air is supplied into the curtain airbag 30 by an air pump or the like at normal times to inflate the curtain airbag 82 and the front seat side collision chamber 32. It can be confirmed in a state where the internal pressures of the front seat oblique projection chamber 31, the rear seat side projection chamber 34, and the rollover chamber 38 are balanced.

  The gas supply passage 36 is provided in the upper part of the curtain airbag 30 and connects the upper part of the front seat side collision chamber 32 and the upper part of the rear seat side collision chamber 34 to each other. From the upper end portion of the gas supply passage 36, the connection passage 37 described above extends upward and rearward.

  The rollover chamber 38 is inflated and deployed between the front seat side impact chamber 32 and the rear seat side impact chamber 34, and restrains the head H of the rear seat occupant P during an oblique collision and rollover. The rollover chamber 38 is partitioned from the gas supply passage 36 by a non-inflatable portion 44 extending in the front-rear direction of the curtain airbag 30. The rollover chamber 38 is partitioned into an upper chamber 38A and a lower chamber 38B by a crank-shaped non-inflatable portion 46 that extends from the front-rear direction intermediate portion of the non-inflatable portion 44 to the lower edge portion side of the curtain airbag 30. Yes. The lower end portion of the non-inflatable portion 46 is connected to the outer peripheral non-inflatable portion 40 at the lower edge portion of the curtain airbag 30. A throttle channel 54 is formed between the rear end portion of the non-expanding portion 44 and the rear end portion of the non-expandable portion 46, and the upper chamber 38 </ b> A and the rear seat side collision chamber are interposed via the throttle channel 54. 34 are in communication with each other. The rollover chamber 38 covers the frontmost test point among the test points (impactor striking point or striking point) for hitting the impactor corresponding to the head H of the rear seat occupant P in the rollover test (FMVSS226 standard). Is provided.

  Further, the lower chamber 38B is partitioned from the front seat-side collision chamber 32 by an inflating portion 48 extending in the vertical direction of the curtain airbag 30. The non-inflatable portion 48 extends from the outer peripheral non-inflatable portion 40 at the lower edge portion of the curtain airbag 30. A throttle channel 56 is formed between the upper end portion of the non-expandable portion 48 and the front end portion of the non-expandable portion 44, and the lower chamber 38 </ b> B and the front seat side collision chamber 32 are interposed via the throttle channel 56. Are in communication with each other.

  As described above, the curtain airbag 30 configured as described above has a plurality of fixing tabs 60 extending from the upper edge portion. These fixing tabs 60 are formed by cutting out a base fabric similar to the base fabric of the curtain airbag 30, and are sewn (coupled) to the outer peripheral non-inflatable portion 40 at the upper edge portion of the curtain airbag 30. ing. These fixing tabs 60 are fixed to an A pillar (not shown) and the roof side rail 24 by fasteners 62 (for example, clips, bolts, and nuts). Note that a plurality of fixing tabs 60 may be integrally extended from the outer peripheral non-inflatable portion 40 at the upper edge portion of the curtain airbag 30.

  As shown in FIG. 4, the curtain airbag 30 is folded in the vehicle vertical direction to be elongated, and is housed in the roof side portion 22 together with the inflator 70. The curtain airbag 30 is folded in a predetermined folding manner including, for example, at least one of roll folding and bellows folding. In the stored state of the curtain airbag 30, the curtain airbag 30 extends from the A pillar to the C pillar 26 across the roof side portion 22, and the curtain airbag 30 and the inflator 70 are not shown in the illustration of the A pillar garnish and roof headlining. 28 (not shown in FIG. 4) and the C pillar garnish 26A. In the curtain airbag 30, a portion covered with the C pillar garnish 26 </ b> A includes the rear end side of the rear seat side collision chamber 34.

  In the vehicle curtain airbag device 10 having the above-described configuration, when the inflator 70 is operated, the gas from the inflator 70 passes through the connection passage 37 and the gas supply passage 36, and the front seat side collision chamber 32 and the rear seat side collision chamber 34. (See arrow G in FIG. 2). As a result, the front seat side collision chamber 32 is inflated and deployed between the head of the front seat occupant and the front side glass 16, and the rear seat side projection chamber 34 is located between the head H of the rear seat occupant P and the rear side glass 20. Inflates and expands. Further, a part of the gas supplied to the front seat side collision chamber 32 is supplied to the front seat oblique projection chamber 31 through the throttle channels 50 and 52 and also through the throttle channel 56 to the rollover chamber 38. To the lower chamber 38B. Further, a part of the gas supplied to the rear seat side collision chamber 34 is supplied to the upper chamber 38 </ b> A of the rollover chamber 38 through the throttle channel 54. As a result, the front seat oblique chamber 31 and the rollover chamber 38 start to expand behind the front seat side chamber 32 and the rear seat side chamber 34. This is because the timing at which the head of the front seat occupant and the head H of the rear seat occupant P come into contact with the curtain airbag 30 is delayed in the case of an oblique collision and rollover compared to the case of a side collision. is there.

  For this reason, at the time of a side collision, before the expansion of the front seat oblique projection chamber 31 and the rollover chamber 38 is completed, the head of the front seat occupant and the head H of the rear seat occupant P are The seat side collision chamber 34 is constrained (contacted). In other words, at the timing when the head of the front seat occupant and the head H of the rear seat occupant P are restrained by the front seat side collision chamber 32 and the rear seat side collision chamber 34, the front seat side collision chamber 32 and the rear seat side collision chamber. The internal pressure of 34 is higher than the internal pressures of the front seat oblique protrusion chamber 31 and the rollover chamber 38, and an internal pressure imbalance is generated in each chamber. In FIG. 2, dots are added to places where the pressure becomes high at the above timing. As shown in FIG. 2, the front seat oblique projection chamber 31 and the rollover chamber 38 that are not provided with dots are locations where the pressure is relatively low at the above timing. A region in the vehicle front-rear direction indicated by an arrow LP in FIG. 2 (a region where the rollover chamber 38 is provided) is a region where the rigidity is relatively lowered at the above timing.

  Here, in this embodiment, as shown in FIGS. 1 to 4, among the plurality of fixing tabs 60 provided on the upper edge portion of the curtain airbag 30, the fixing tab 60 ( Hereinafter, the “rearmost tab 60 </ b> R” is extended from the upper edge of the rear seat side collision chamber 34. The rearmost tab 60R corresponds to a “fixed tab” in the present invention. The rearmost tab 60R is extended to the rear side of the vehicle, thereby forming a tab extension 60R2 as a swing suppression part. Specifically, the rearmost tab 60R includes a tab main body portion 60R1 whose dimension in the vehicle front-rear direction is set to be equal to that of the other fixed tab 60, and a rear edge portion of the tab main body portion 60R1 from the rear side of the vehicle. A tab extension 60R2 extending integrally is formed. In FIG. 3 (a diagram showing a configuration around the upper edge portion of the rear seat side collision chamber 34 before inflating and deploying), a two-dot chain line is shown at the boundary between the tab main body portion 60R1 and the tab extension portion 60R2. .

  The tab main body portion 60R1 is formed in a rectangular shape when viewed in the vehicle width direction, and is disposed in the middle portion in the vehicle front-rear direction at the upper edge portion of the rear seat-side collision chamber 34. An insertion hole 64 through which the above-described fastener 62 is inserted is formed on the upper side of the tab main body 60R1. In the following description, the fastener 62 inserted through the insertion hole 64 of the tab main body 60R1 is referred to as a “fastener 62R”.

  The tab extension 60R2 is located on the vehicle rear side of the rear seat-side collision chamber 34 fixed position to the roof side rail 24 (position of the fastener 62R), and the rear end (curtain) It extends to the rear end of the airbag 30. The tab extension 60R2 is formed in a substantially right triangle shape having the longitudinal direction in the vehicle longitudinal direction as viewed in the vehicle width direction, and the dimension in the vertical direction of the vehicle is reduced toward the vehicle rear side.

  The rearmost tab 60R having the above-described configuration is sewn (coupled) with the upper edge of the rear seat side collision chamber 34 at the lower edge portion, so that the rear portion (including the rear end portion 34R) of the rear seat side collision chamber 34 is sewn. Connected to the upper edge. Specifically, the lower edge portion of the rearmost tab 60R and the portion constituting the upper edge portion of the rear seat side collision chamber 34 in the outer peripheral non-expandable portion 40 are overlapped, and a plurality of the overlapped portions are included. Sewing is performed in (here, three) sewing portions S (not shown except in FIG. 3). The three sewing portions S include a lower edge portion of the tab main body portion 60R1 (front end portion of the rearmost tab 60R), a lower edge portion of the middle portion in the front-rear direction of the tab extension portion 60R2, and a rear end portion (last end) of the tab extension portion 60R2. The rear edge of the side tab 60R is set at the lower edge, and is arranged at equal intervals in the vehicle longitudinal direction. In the present embodiment, the three sewing portions S are divided in the vehicle front-rear direction. However, the present invention is not limited to this, and the configuration in which the three sewing portions S are connected in the vehicle front-rear direction (one sewing portion S is provided). Configuration).

  As described above, the rearmost tab 60R sewn on the upper edge of the rear seat-side collision chamber 34 is inflated and deployed by the rear seat-side collision chamber 34, and as shown in FIGS. And it curves to the rear side of the vehicle. In this state, the tab extension 60R2 is elongated in the longitudinal direction, and a tension acts on the tab extension 60R2, whereby a vehicle upward force F1 acts on the rear end 34R of the rear seat side collision chamber 34. . This force F1 increases when the rear seat side collision chamber 34 tries to swing toward the front side of the vehicle around the position fixed to the roof side rail 24 (position of the fastener 62R). Accordingly, the rear seat side collision chamber 34 that has been inflated and deployed is prevented from swinging toward the vehicle front side.

(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 74, the inflator 70 is operated by the ECU 73. As a result, the front seat side collision chamber 32 is inflated and deployed between the head of the front seat occupant and the front side glass 16, and the rear seat side projection chamber 34 is located between the head H of the rear seat occupant P and the rear side glass 20. The front seat obliquely projecting chamber and the rollover chamber 38 start to expand with a delay from the front seat side projecting chamber 32 and the rear seat side projecting chamber 34. Then, before the expansion of the rollover chamber 38 is completed, the head H of the rear seat occupant P is restrained (contacted) by the rear seat side collision chamber 34.

  Here, in this embodiment, the rearmost tab 60R extended from the upper edge of the rear seat side collision chamber 34 and fixed to the roof side rail 24 has a tab extension 60R2 extended to the vehicle rear side. doing. The tab extension 60R2 is an upper edge of the rear end portion 34R of the rear seat side projecting chamber 34 on the rear side of the vehicle with respect to the rear seat side projecting chamber 34 fixed to the roof side rail 24 (position of the fastener 62R). Connected to the club. For this reason, when the rear seat side collision chamber 34 inflated and deployed attempts to swing toward the vehicle front side, the tab extension 60R2 is extended, and a tension acts on the tab extension 60R2. As a result, the upward force F1 of the vehicle acts on the rear end portion 34R of the rear seat side collision chamber 34 that has been inflated and deployed, and therefore the rear seat side collision chamber 34 that has been inflated and deployed may swing forward in the vehicle. It is suppressed. As a result, the rear-seat-side collision chamber 34 can restrain the head H of the rear-seat occupant P at the designed position, so that the restraining performance of the rear-seat-side collision chamber 34 can be stabilized.

  The above effect will be described in detail with reference to a vehicle curtain airbag device 100 shown in FIGS. 5 and 6 (hereinafter referred to as “Comparative Example 100”). In the comparative example 100, the rearmost tab 60R does not have the tab extension 60R2 described above, but the other configuration is the same as that of the present embodiment. In FIGS. 5 and 6, the same reference numerals are given to the same configurations as those of the present embodiment. In this comparative example 100, as in the present embodiment, the timing at which the head H of the rear seat occupant P is restrained by the rear seat-side collision chamber 34 at the time of a side collision is the timing before the expansion of the rollover chamber 38 is completed. It is said that.

  At the above timing, since the internal pressure of the rollover chamber 38 is lower than the internal pressure of the rear seat side collision chamber 34, the low pressure rollover chamber 38 is pushed by the high pressure rear seat side collision chamber 34, and at the middle part in the vehicle longitudinal direction. It bends and is compressed in the vehicle longitudinal direction (see FIG. 5). As a result, when the rear seat side collision chamber 34 is allowed to swing toward the vehicle front side, the head H of the rear seat occupant P is not restrained by the rear seat side collision chamber 34 at the designed position, and the rear seat The restraining performance of the side collision chamber 34 becomes unstable.

  Further, when the rear seat side collision chamber 34 swings (displaces) toward the front side of the vehicle as shown by a two-dot chain line in FIG. 6, the position where the expansion width in the vehicle width direction is maximum in the rear seat side collision chamber 34. The vehicle is displaced forward of the center of gravity of the head H of the rear seat occupant P. As a result, the rear seat side collision chamber 34 is curved such that the constraining surface facing the center of gravity of the head H in the vehicle width direction is directed inward in the vehicle width direction toward the vehicle front side (the tangent line in FIG. 6). L2). In this state, when the head H enters the rear seat side collision chamber 34 and rebounds toward the center in the vehicle width direction, the rebound direction (bounce direction) of the head H is inclined toward the vehicle rear side with respect to the vehicle width direction ( (See arrow RB2 in FIG. 6). For this reason, when the rebound head H comes into contact with the seat back 14B and receives a frictional force, a rotational force around the axis of the neck N (see arrow RO2 in FIG. 6) acts on the head H. As a result, brain rotation injury (Brain Rotation Injury Criterion; so-called BrIC) may occur.

  On the other hand, in the present embodiment, as described above, the rear seat side collision chamber 34 is restrained from swinging toward the vehicle front side, so that the rear seat side collision chamber 34 is against the head H of the rear seat occupant P. The rear seat side collision chamber 34 shown by the solid line in FIG. In this state, the constraining surface of the rear seat side collision chamber 34 is curved so as to go outward in the vehicle width direction toward the vehicle front side (see tangent L1 in FIG. 6). When the head H enters the rear seat side collision chamber 34 in this state, the rebound direction of the head H tends to be inclined toward the vehicle front side with respect to the vehicle width direction (see arrow RB1 in FIG. 6), and the rebound head It becomes difficult for the portion H to come into contact with the seat back 14B of the rear seat 14 and the headrest 14H.

  Further, when the rear seat occupant P is restrained by a three-point seat belt, the head H that has rebounded in the direction of the arrow RB1 in FIG. Thus, the moving direction is changed toward the rear of the vehicle (see arrow RB11 in FIG. 6). As a result, even if the head H comes into contact with the seat back 14B of the rear seat 14, the contact timing is delayed (see arrow D in FIG. 6). Thereby, since the head H is decelerated, the rotational force (refer arrow RO1 of FIG. 6) which acts on the head H at the time of a contact reduces. From the above, according to this embodiment, the head rotation injury of the rear seat occupant P at the time of a side collision can be prevented or effectively suppressed.

  In addition, in the present embodiment, the rearmost tab 60R is restrained from swinging to the front side of the vehicle by an extremely simple configuration in which the rearmost tab 60R is extended to the rear side of the vehicle to form the tab extension 60R2. can do. In addition, the swinging of the rear seat side collision chamber 34 toward the front side of the vehicle is performed by adding a fixing tab 60 to the upper edge of the rear end portion 34R of the rear seat side collision chamber 34 (the vehicle rear side of the rearmost tab 60R). Can also be suppressed. However, when the fixing tab 60 is added as described above, the rear seat side collision chamber 34 becomes difficult to be pulled out to the vehicle interior side of the C pillar garnish 26A when the curtain airbag 30 is inflated and deployed. Although there is a possibility that the deployment performance is deteriorated, this can be avoided in the present embodiment.

  Further, the swing of the rear seat side collision chamber 34 toward the front side of the vehicle can be suppressed, for example, by connecting the rear end lower portion of the rear seat side collision chamber 34 and the C pillar 26 with a strap or the like. However, when the above-described strap or the like is applied, design considerations for drawing out the strap or the like from the C pillar garnish 26A when the curtain airbag 30 is inflated and deployed are limited, and the design around the C pillar garnish 26A is restricted. In addition, it is necessary to take measures to prevent the C pillar garnish 26A from cracking and scattering. For this reason, the arrangement | positioning area | region of a strap etc. will be limited and application of a strap etc. may be difficult. In this regard, in the present embodiment, the above design considerations are not necessary.

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

<Second Embodiment>
FIG. 7 is a side view of the curtain airbag device 80 according to the second embodiment of the present invention in the middle of inflation and deployment of the curtain airbag 82 in a side view corresponding to FIG. In the curtain airbag 82, the tab extension 60R2 according to the first embodiment is omitted. Instead, the curtain airbag 82 includes an extension chamber 84 (a swing suppression portion) that extends from the rear end portion 34R of the rear seat-side collision chamber 34.

  The extension chamber 84 extends from the lower side of the rear end portion 34R of the rear seat side collision chamber 34 to the vehicle rear side, and constitutes the rear end portion of the curtain airbag 82. The extension chamber 84 and the rear seat-side bump chamber 34 are in communication with each other, and gas from the inflator 70 is supplied to the extension chamber 84 via the rear seat-side bump chamber 34. Accordingly, the extension chamber 84 is configured to expand and deploy to the rear of the rear seat side collision chamber 34 in the vehicle. As shown in FIG. 7, the extension chamber 84 is formed to have a substantially rectangular shape when the inflated and deployed state is viewed in the vehicle width direction. An expansion width h1 in the vehicle vertical direction of the extension chamber 84 is set to be smaller (about half in this embodiment) than an expansion width h2 in the vehicle vertical direction of the rear seat side collision chamber 34. Accordingly, as shown in FIG. 8, the expansion width w1 of the extension chamber 84 in the vehicle width direction is set to be smaller than the expansion width w2 of the rear seat side collision chamber 34 in the vehicle width direction. The internal volume (internal volume) of the extension chamber 84 is set to be sufficiently smaller than the internal volume (internal volume) of the rear seat side collision chamber 34.

  In addition, each said expansion | swelling width | variety can be compared by supplying air in the curtain airbag 82 by an air pump etc. at the normal time, and inflating the curtain airbag 82, for example. The headrest 14H of the rear seat 14 is connected to the seat back 14B of the rear seat 14 so that the vertical position can be adjusted. In the present embodiment, the extension chamber 84 and the headrest 14H in the inflated and deployed state can be used regardless of whether the headrest 14H is positioned at the upper end (uppermost position) or the lower end (lowermost position) of the adjustment range of the vertical position with respect to the seat back 14B. Are configured to overlap in the vehicle width direction view. Further, in the present embodiment, the rear end of the inflated and expanded extension chamber 84 is configured to be positioned on the vehicle rear side with respect to the rear end of the headrest 14H in the vehicle front-rear direction.

  The extension chamber 84 is configured such that its lower surface comes into contact with the upper surface of the seat back 14B when inflated and deployed. For this reason, when the rear seat side collision chamber 34 that has been inflated and deployed is going to swing toward the vehicle front side, the rear end portion 34R of the rear seat side collision chamber 34 passes from the upper surface of the seat back 14B via the extension chamber 84. The vehicle is configured to receive upward force (reaction force) F2. Further, when the rear seat side collision chamber 34 tries to swing as described above, the rear seat side collision chamber 34 receives the friction force F3 directed toward the rear of the vehicle from the upper surface of the seat back 14 via the extension chamber 84. It is configured.

  Further, as shown in FIGS. 8 and 9, the extension chamber 84 is inflated and deployed between the headrest 14H and the C pillar garnish 26A in the vehicle width direction, and slightly extends between the headrest 14H and the C pillar garnish 26A. It is configured to be sandwiched in a compressed state. That is, the inflated and expanded extension chamber 84 is formed so as to come into contact (pressure contact) with each side surface of the headrest 14H and the C pillar garnish 26A. For this reason, when the rear seat side collision chamber 34 attempts to swing as described above, the rear seat side collision chamber 34 faces the vehicle rearward from each side surface of the headrest 14H and the C pillar garnish 26A via the extension chamber 84. The frictional force F3 is received. 8 and 9, the arrow IP indicates the internal pressure of the extension chamber 84. In this embodiment, the configuration other than the above is the same as that of the first embodiment.

  In this embodiment, when the inflated and deployed rear seat side collision chamber 34 tries to swing toward the front side of the vehicle, the rear end portion 34R of the rear seat side collision chamber 34 is connected to the seat back 14B via the extension chamber 84. A reaction force F2 directed upward from the vehicle is received from above. Further, the rear seat side collision chamber 34 receives a friction force F3 directed toward the rear of the vehicle from the upper surface of the seat back 14B via the extension chamber 84. Thereby, rocking | fluctuation to the vehicle front side of the rear seat side collision chamber 34 can be suppressed with a simple structure. Therefore, also in this embodiment, the same effect as that of the first embodiment can be obtained.

  Moreover, in this embodiment, the expanded chamber 84 that is inflated and deployed is sandwiched between the headrest 14H and the C pillar garnish 26. For this reason, when the rear seat side collision chamber 34 inflated and deployed attempts to swing toward the front side of the vehicle, in addition to the reaction force F2 and the friction force F3 with respect to the extension chamber 84, the headrest 14H and the C pillar. A friction force directed toward the rear of the vehicle is applied from each side surface of the garnish 26. Thereby, the rocking | fluctuation to the vehicle front side of the rear seat side collision chamber 34 can be suppressed more effectively.

  Further, in this embodiment, the head H 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 side collision chamber 34, and the reaction causes the head H of the rear seat occupant P to move back. When the rear seat side collision chamber 34 tries to rebound to the center side in the vehicle width direction, the rebound of the rear seat side collision chamber 34 to the vehicle width direction center side is suppressed by the interference between the extension chamber 84 and the headrest 14H. (Regulated). Thereby, the head rotation injury mentioned above can be suppressed more effectively.

  That is, when the curtain airbag 30 is not provided with the extension chamber 84 as in the comparative example 100 shown in FIG. 5, for example, the head H is rebounded from the rear seat side collision chamber 34 as shown in FIG. , The rear seat side collision chamber 34 rebounds (swings) together with the head H to the center in the vehicle width direction (see arrow SW in FIG. 10). As a result, the rear seat side collision chamber 34 may continue to push the head H toward the center in the vehicle width direction for acceleration (see arrow A in FIG. 10). When the accelerated head H comes into contact with the seat back 14B, the rotational force acting on the head H increases. In this respect, in the present embodiment, the swing toward the center in the vehicle width direction of the rear seat side collision chamber 34 is suppressed (restricted) using the headrest 14H, so that the head H is pushed by the rear seat side collision chamber 34. Acceleration can be prevented or suppressed.

<Supplementary explanation of the embodiment>
In the second embodiment, the rearmost tab 60R of the curtain airbag 82 is not provided with the tab extension 60R2. However, the present invention is not limited to this. That is, as in the first modification shown in FIG. 11, the rearmost tab 60R of the curtain airbag 82 may include a tab extension 60R2. Thereby, the effect which suppresses rocking | fluctuation to the vehicle front side of the rear seat side collision chamber 34 can be improved further. Further, as in the first modified example, a non-expanding portion 86 may be set between the rear seat side collision chamber 34 and the extension chamber 84, and the extension chamber 84 may be a delay chamber.

  The non-inflatable portion 86 extends from the outer peripheral non-inflatable portion 40 toward the lower end side of the curtain airbag 82 at the front end and upper end of the extension chamber 84. The lower end of the non-expanding portion 86 is located near the center in the vertical direction of the extension chamber 84, and a throttle channel 88 is formed between the lower end of the non-expanding portion 86 and the upper edge of the extension chamber 84. Has been. The throttle channel 88 is formed at the lower end of the curtain airbag 82, and allows the rear seat-side collision chamber 34 and the extension chamber 84 to communicate with each other. Accordingly, a part of the gas ejected from the inflator 50 and supplied to the rear seat side collision chamber 34 is supplied to the extension chamber 84 through the throttle channel 88 (see FIG. 11). (See arrow G).

  In the first modification, the configuration is as described above. Therefore, after the extension chamber 84 is pulled out to the vehicle interior side of the C pillar garnish 26A by the expansion and deployment of the rear seat side collision chamber 34, the extension chamber 84 is Can be inflated. Thereby, since the load which the C pillar garnish 26A receives when the extension chamber 84 is pulled out to the vehicle interior side of the C pillar garnish 26A can be reduced, it is easy to prevent cracking and scattering of the C pillar garnish 26A. Become. In addition, the extension chamber 84 can be easily inflated and deployed in the gap between the headrest 14H and the C pillar garnish 26A.

  In the first modified example, the non-inflatable portion 86 for making the extension chamber 84 a delay chamber extends from the outer peripheral non-inflatable portion 40 toward the lower end side of the curtain airbag 30 at the front end and upper end of the extension chamber 84. Although the configuration has been made, it is not limited to this. That is, you may comprise like the 2nd-4th modification shown by FIGS. 12-14, for example. In addition, illustration of the fixing tab 60 is abbreviate | omitted in FIGS. In the second modified example shown in FIG. 12, a circular non-expandable portion 90 is set at the middle portion in the vertical direction at the front end portion of the extension chamber 84. Further, throttle passages 92 and 94 are formed on both the upper and lower sides of the curtain airbag 82 with respect to the non-inflatable portion 90, and the rear seat side collision chamber 34 extends through these throttle passages 92 and 94. The chamber 84 is in communication with each other.

  Further, in the third modified example shown in FIG. 13, the non-inflatable portion 96 extends from the outer peripheral non-inflatable portion 40 toward the upper end side of the curtain airbag 30 at the front end and the lower end of the extension chamber 84. A throttle channel 97 is formed between the upper end of the non-inflatable portion 96 and the upper edge of the extension chamber 84. The rear seat side collision chamber 34 and the extension chamber 84 are in communication with each other through the throttle channel 97. Further, in the fourth modification shown in FIG. 14, a non-inflatable portion 98 extending in the front-rear direction of the curtain airbag 82 is set in the middle portion of the extension chamber 84 in the vertical direction. Thereby, the extension chamber 84 is partitioned into the upper part 84A and the lower part 84B. The upper portion 84A and the lower portion 84B are communicated with the rear seat-side collision chamber 34, respectively. By changing the shape of the non-expandable portions 86, 90, 96, and 98 as in the first to fourth modifications, the expansion and deployment completion timing of the extension chamber 84 and the expansion width of the extension chamber 84 in the vehicle width direction can be reduced. It can be changed arbitrarily.

  Further, the extension chamber 84 according to the second embodiment is formed to have a substantially rectangular shape when the inflated and deployed state is viewed in the vehicle width direction. However, the present invention is not limited to this, and the extension chamber 84 is not limited thereto. The shape of can be changed as appropriate.

  In each of the above embodiments, the curtain airbags 30 and 82 are configured to include the rollover chamber 38, but the present invention is not limited to this. That is, the present invention is a curtain airbag of a type in which a non-inflatable portion made only of a base fabric is provided below the gas supply passage 36 and between the front seat side collision chamber 32 and the rear seat side collision chamber 34. Nothing is provided below the gas supply passage 36 and between the front seat side collision chamber 32 and the rear seat side collision chamber 34 (the above-described non-inflatable portion and the rollover chamber 38 are not provided). It can also be applied to a type of curtain airbag.

  Further, in each of the above embodiments, the case where the vehicle curtain airbag devices 10 and 80 are applied to the sedan type automobile 12 (vehicle) is described. However, the present invention is not limited to this, and the vehicle curtain airbag according to the present invention is used. The apparatus can also 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 Vehicle curtain airbag apparatus 14 Rear seat 14H Headrest 14B Seat back 22 Roof side part 20 Rear side glass (vehicle compartment side part)
26 C Pillar Garnish 30 Curtain Airbag 34 Rear Seat Side Collision Chamber 34R Rear End 60R Rear Tab (Fixed Tab)
60R2 Tab extension (swing suppression part)
80 Curtain Airbag Device for Vehicle 82 Curtain Airbag 84 Extension Chamber (Swing Suppression Unit)
P Rear seat occupant H Head

Claims (4)

A rear-side collision chamber that is fixed to the roof side portion of the vehicle and has a fixed tab extended from the upper edge, and expands and deploys between the head of the rear-seat occupant and the passenger compartment side;
By applying a force upward in the vehicle to the rear end portion of the rear seat side collision chamber inflated and deployed on the rear side of the vehicle relative to the position fixed to the roof side portion in the rear seat side collision chamber, A swing suppressing portion that suppresses swinging of the rear seat side collision chamber toward the vehicle front side;
A curtain airbag device for a vehicle having a curtain airbag comprising:   The curtain airbag device for a vehicle according to claim 1, wherein the swing suppression portion is a tab extension portion formed by extending the fixed tab toward the vehicle rear side.   The swing suppression portion is an extension chamber that extends from a rear end portion of the rear seat side collision chamber, expands and deploys behind the vehicle in the rear seat side collision chamber, and contacts the upper surface of the seat back of the rear seat. The curtain airbag device for a vehicle according to claim 1 or 2.   The curtain airbag device for a vehicle according to claim 3, wherein the inflated and extended extension chamber is sandwiched between a headrest of a rear seat and a C pillar garnish.