JP2017100682A - Rear seat occupant protection airbag device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear seat occupant protection airbag device for a vehicle which can improve the restraining performance of a rear seat occupant.SOLUTION: A rear seat occupant protection airbag device for a vehicle comprises: an inflator for a curtain airbag which is arranged in a vehicle 12; a curtain airbag 50 which is expanded and deployed at the inside of a vehicle width direction of a side windshield at a rear seat 28 side by receiving the supply of a gas from the inflator for the curtain airbag; a front collision airbag 70 which is arranged at a lower end part 50L of the curtain airbag 50, expanded and deployed to the inside of a vehicle width direction from the lower end part 50L of the curtain airbag 50 by receiving the supply of the gas from the curtain airbag 50, and arranged between a rear seat occupant PR who is seated on the rear seat 28 and a front seatback; and a reaction strap 80 for connecting an intermediate part of the front collision airbag 70 in the vehicle width direction and an upper part 50U of the curtain airbag 50.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicular rear seat occupant protection airbag device.

  In the event of a frontal collision of the vehicle (hereinafter referred to as “front collision”), the vehicle is inflated and deployed from the lower part of the curtain airbag toward the passenger compartment, and is disposed between the chest of the rear seat occupant and the front seat back (front seat back). There is a vehicle occupant protection device including a rear seat airbag (see, for example, Patent Document 1). In the technique disclosed in Patent Document 1, when the rear seat occupant moves to the front side of the vehicle at the time of a front collision, the rear seat occupant is restrained by the rear seat airbag.

  In addition, as a vehicle occupant protection device, there are, for example, the following Patent Documents 2 to 7 apart from Patent Document 1.

JP 2010-137752 A JP-A-10-166980 JP 2009-083718 A JP 2008-279977 A JP 2003-246254 A JP 2008-221904 A JP 2006008105 A

  However, in the technique disclosed in Patent Document 1, the rear seat airbag restrains the rear seat occupant by taking a reaction force against the front seat back. Therefore, depending on the position of the front seat back in the vehicle front-rear direction and the tilt angle (reclining angle) at the time of a front collision, the rear seat airbag cannot take a sufficient reaction force on the front seat back, and the rear seat There is a possibility that the occupant's restraining performance will be reduced.

  Therefore, an object of the present invention is to provide a vehicular rear seat occupant protection airbag device capable of improving the performance of restraining the rear seat occupant.

  The vehicle rear seat occupant protection airbag device according to claim 1 is provided with a curtain airbag inflator provided in a vehicle and a side window glass on the rear seat side upon receipt of gas supply from the curtain airbag inflator. A curtain airbag that is inflated and deployed on the inner side in the vehicle width direction of the vehicle, and provided at a lower portion of the curtain airbag. A front-impact airbag disposed between a rear-seat occupant seated on the seat and a front seat back of the front seat, and an intermediate portion of the front-impact airbag in the vehicle width direction or an inner end in the vehicle width direction And a reaction force strap connecting the upper part of the curtain airbag or the skeleton member on the vehicle upper side of the side window glass.

  According to said structure, a curtain airbag receives supply of gas from the inflator for curtain airbags, and is inflate-deployed by the vehicle width direction inner side of the side window glass of the rear seat side. In addition, a front impact airbag is provided below the curtain airbag. The front impact airbag is supplied with gas from the curtain airbag, is inflated and deployed from the bottom of the curtain airbag inward in the vehicle width direction, and is seated in the rear seat and the front seat in the front seat. Arranged between the back.

  By the way, at the time of a vehicle side collision (hereinafter referred to as “side collision”), the head of the rear seat occupant moves inertially toward the side window glass side (vehicle width direction outside). At this time, when the curtain airbag inflator is operated, the head of the rear seat occupant can be restrained by the inflated and deployed curtain airbag.

  On the other hand, at the time of a front collision, the head of the rear seat occupant moves inertially toward the vehicle front side. At this time, when the curtain airbag inflator is operated, the rear seat occupant is restrained by the inflated and deployed front impact airbag.

  Here, when the rear-seat occupant is restrained by the front-impact airbag, if the front-impact airbag is deformed to the front side or the lower side of the curtain airbag, the rear-seat occupant is caused by the front-impact airbag. The binding force may be reduced.

  On the other hand, in the present invention, the intermediate portion in the vehicle width direction of the front impact airbag or the inner end portion in the vehicle width direction and the skeleton member on the upper side of the curtain airbag or the vehicle upper side of the side window glass are opposite to each other. Connected by force strap. This reaction force strap prevents the front impact airbag from being deformed toward the vehicle front side or the vehicle lower side with respect to the curtain airbag. Therefore, the restraining performance of the rear seat occupant by the front impact airbag is improved.

  The vehicular rear seat occupant protection airbag device according to claim 2 is the vehicular rear seat occupant protection airbag device according to claim 1, wherein the front impact airbag is in an inflated and deployed state on the thigh of the rear seat occupant. The vehicle is disposed above the abdomen of the vehicle and below the vehicle above the top of the head of the rear seat occupant.

  According to the above configuration, the front airbag is in an inflated and deployed state on the thigh of the rear seat occupant, above the abdomen of the rear seat occupant and above the head of the rear seat occupant. It is arranged on the vehicle lower side than the upper part.

  Here, at the time of a front collision, the upper half of the rear seat occupant wearing the seat belt tilts toward the front of the vehicle around the waist (waist belt portion) of the rear seat occupant. As a result, the head of the rear seat occupant is swung down to the vehicle front side and the vehicle lower side. The head of the rear seat occupant contacts the front collision airbag from the upper side of the vehicle.

  On the other hand, the arm portion of the rear seat occupant is swung up on the thigh of the rear seat occupant. This arm portion contacts the front impact airbag from the lower side of the vehicle. That is, the front collision airbag is sandwiched between the head and arm of the rear seat occupant, and restrains the head and arm in this state. In other words, the front-impact airbag restrains the head by taking a reaction force on the arm of the rear seat occupant who is swung up. Therefore, the restraint performance of the head of the rear seat occupant by the front impact airbag is improved.

  The vehicle rear seat occupant protection airbag device according to claim 3 is provided at a rear end portion on the vehicle rear side of the front collision airbag according to claim 2, and gas is supplied from the front collision airbag. And a lower limb reaction force airbag that is inflated and deployed on the vehicle lower side than the front collision airbag.

  According to said structure, the leg reaction force airbag is provided in the rear-end part of the vehicle rear side of the airbag for front collisions. The lower limb reaction force airbag is supplied with gas from the front collision airbag and is inflated and deployed on the vehicle lower side than the front collision airbag.

  As a result, when the head of the rear seat occupant swung down is restrained by the front impact airbag during a front impact, the lower limb reaction force airbag is sandwiched between the chest and thigh of the rear seat occupant. . Therefore, the front airbag can restrain the head by applying a reaction force to the thigh of the rear seat occupant via the lower limb reaction force airbag. Therefore, the restraint performance of the head of the rear seat occupant by the front impact airbag is improved.

  The vehicle rear seat occupant protection airbag device according to claim 4 is provided at a rear end portion on the vehicle rear side of the front collision airbag according to claim 2, and gas is supplied from the front collision airbag. And a head restraint airbag that is inflated and deployed on the vehicle upper side than the front collision airbag.

  According to said structure, the head restraint airbag is provided in the rear-end part of the vehicle rear side of the airbag for front collisions. The head restraint airbag is inflated and deployed on the upper side of the vehicle with respect to the front collision airbag upon receipt of gas supply from the front collision airbag.

  Thus, when the head of the rear seat occupant is swung down at the time of a front collision, first, the head of the rear seat occupant is restrained by the head restraint airbag. Next, when the head of the rear seat occupant is further swung down, the head is restrained by the front collision airbag via the head restraint airbag. Therefore, in this invention, compared with the case where the head restraint airbag is not provided in the front collision airbag, the head of the rear seat occupant can be restrained earlier. Therefore, the restraining performance of the head of the rear seat occupant at the time of the front collision is improved.

  The vehicle rear seat occupant protection airbag device according to claim 5 includes a curtain airbag inflator provided in the vehicle, a front impact inflator provided in the vehicle, and gas from the curtain airbag inflator. A curtain airbag that is inflated and deployed inside the vehicle width direction of the side window glass on the rear seat side upon receipt of the supply, and is provided at a lower portion of the curtain airbag, and is supplied with gas from the front impact inflator A front-impact airbag that is inflated and deployed from the bottom inward in the vehicle width direction and is disposed between a rear-seat occupant seated in the rear seat and a front seat back of the front seat, and the front-impact airbag vehicle A reaction force connecting the intermediate portion in the width direction or the inner end portion in the vehicle width direction with the upper frame of the curtain airbag or the skeleton member on the vehicle upper side of the side window glass. It comprises a wrap, a.

  According to said structure, a curtain airbag receives supply of gas from the inflator for curtain airbags, and is inflate-deployed by the vehicle width direction inner side of the side window glass of the rear seat side. In addition, a front impact airbag is provided below the curtain airbag. The front impact airbag is supplied with gas from the front impact inflator, is inflated and deployed from the bottom of the curtain airbag inward in the vehicle width direction, and is disposed between the rear seat passenger and the front seat back. The

  By the way, at the time of a side collision, the head of the rear seat occupant moves inertially to the side window glass side (vehicle width direction outer side). At this time, when the curtain airbag inflator is operated, the head of the rear seat occupant can be restrained by the inflated and deployed curtain airbag.

  On the other hand, at the time of a front collision, the head of the rear seat occupant moves inertially toward the front side of the vehicle. At this time, when the curtain airbag inflator and the front impact inflator are operated, the head of the rear seat occupant is restrained by the inflated and deployed front impact airbag.

  Here, when the rear-seat occupant is restrained by the front-impact airbag, if the front-impact airbag is deformed to the front side or the lower side of the curtain airbag, the rear-seat occupant is caused by the front-impact airbag. The binding force may be reduced.

  On the other hand, in the present invention, the intermediate portion in the vehicle width direction of the front impact airbag or the inner end portion in the vehicle width direction and the skeleton member on the upper side of the curtain airbag or the vehicle upper side of the side window glass are opposite to each other. Connected by force strap. This reaction force strap prevents the front impact airbag from being deformed toward the vehicle front side or the vehicle lower side with respect to the curtain airbag. Therefore, the restraining performance of the rear seat occupant by the front impact airbag is improved.

  Further, the curtain airbag is inflated and deployed upon receiving a gas supply from the curtain airbag inflator. On the other hand, the front-impact airbag is inflated and deployed upon receiving gas supply from the front-impact inflator. As a result, the front impact airbag is inflated and deployed at an early stage as compared with the case where the front impact airbag is inflated and deployed by receiving gas supply from the curtain airbag inflator via the curtain airbag. Can do. In addition, the deployment timing of the front impact airbag and the back internal pressure can be adjusted independently for the rear seat.

  The vehicle rear seat occupant protection airbag device according to claim 6 is the vehicle front seat collision according to any one of claims 1 to 5, and a part of the front seat is the front collision. And a front seat moving means for moving the front seat to the front side of the vehicle and disposing a part of the front seat outside the inflated and deployed region when located in the inflated and deployed region of the airbag.

  According to the above configuration, the front seat moving means is configured such that when the front collision of the vehicle is predicted and a part of the front seat is located within the inflating and deploying region of the front collision airbag, And a part of the front seat is disposed outside the inflating and deploying region of the front impact airbag. Thereby, it is suppressed by the part of the front seat that the expansion and deployment of the airbag for front collision is inhibited. Therefore, the rear seat occupant can be restrained by the front collision airbag.

  A vehicle rear seat occupant protection airbag device according to a seventh aspect is the vehicle front seat occupant protection airbag device according to any one of the first to sixth aspects, wherein a vehicle front collision is predicted and the rear seat is located outside a predetermined region. A rear seat moving means for moving the rear seat in the vehicle front-rear direction and arranging the front seat in the predetermined area.

  According to the above configuration, the rear seat moving means moves the rear seat in the vehicle front-rear direction when the frontal collision of the vehicle is predicted and the rear seat is located outside the predetermined area, and the rear seat is moved to the predetermined position. Place in the area. Thus, the distance between the inflated and deployed front impact airbag and the rear seat occupant seated on the rear seat can be within a predetermined range. Therefore, the rear seat occupant can be effectively restrained by the front collision airbag.

  As described above, according to the vehicular rear seat occupant protection airbag device of the present invention, the restraining performance of the rear occupant can be improved.

It is sectional drawing which looked at the right side of the vehicle to which the vehicle rear seat passenger | crew protection airbag apparatus which concerns on 1st Embodiment of this invention was applied from the vehicle width direction center side. It is sectional drawing which looked at the right side rear part of the vehicle shown by FIG. 1 from the vehicle front side. FIG. 2 is a plan development view showing the curtain airbag and the front impact airbag shown in FIG. 1. It is a principal part expanded sectional view of FIG. 1 which shows the inertial movement state of the rear seat passenger | crew at the time of a front collision. (A) And (B) is sectional drawing corresponding to FIG. 2 which shows typically the expansion | deployment process of the curtain airbag shown in FIG. 1, and the airbag for front collisions. It is principal part sectional drawing corresponding to FIG. 4 which shows the vehicle with which the backseat passenger | crew protection airbag apparatus for vehicles which concerns on 2nd Embodiment of this invention was applied. It is sectional drawing corresponding to FIG. 2 which shows the vehicle with which the backseat passenger | crew protection airbag apparatus for vehicles which concerns on 2nd Embodiment of this invention was applied. FIG. 7 is a plan development view showing the curtain airbag, the front impact airbag, and the lower limb reaction force airbag shown in FIG. 6. FIG. 5 is a cross-sectional view of a main part corresponding to FIG. 4 showing an inertial movement state of a rear seat occupant during a front collision. (A) And (B) is sectional drawing corresponding to FIG. 5 which shows typically the expansion | deployment process of the curtain airbag shown by FIG. 6, the airbag for front collision, and the leg reaction force airbag. It is principal part sectional drawing corresponding to FIG. 4 which shows the vehicle with which the backseat passenger | crew protection airbag apparatus for vehicles which concerns on 3rd Embodiment of this invention was applied. It is sectional drawing corresponding to FIG. 2 which shows the vehicle with which the backseat passenger | crew protection airbag apparatus for vehicles which concerns on 3rd Embodiment of this invention was applied. FIG. 12 is a plan development view showing the curtain airbag, front impact airbag, and head restraint airbag shown in FIG. 11. It is sectional drawing corresponding to FIG. 12 which shows the state by which the holding | maintenance strap was cut | disconnected. (A) And (B) is sectional drawing corresponding to FIG. 5 (or FIG. 10) which shows typically the expansion | deployment process of the curtain airbag shown in FIG. 11, the airbag for front collision, and a head restraint airbag. It is. It is principal part sectional drawing corresponding to FIG. 4 which shows the vehicle with which the vehicle rear seat passenger | crew protection airbag apparatus which concerns on 4th Embodiment of this invention was applied. FIG. 17 is a plan development view showing a part of the curtain airbag shown in FIG. 16, a front impact airbag, and a head restraint airbag. It is sectional drawing corresponding to FIG. 1 which shows the vehicle with which the vehicle rear seat passenger | crew protection airbag apparatus which concerns on 5th Embodiment of this invention was applied.

  Hereinafter, a vehicular rear seat occupant protection airbag device according to an embodiment of the present invention will be described with reference to the drawings. Note that an arrow FR appropriately shown in each drawing indicates a vehicle front side (front side in the vehicle front-rear direction), and an arrow UP indicates a vehicle upper side (vehicle vertical direction upper side). An arrow OUT indicates the outside in the vehicle width direction. In the following description, front and rear, up and down, and left and right mean front and rear in the vehicle front and rear direction, up and down in the vehicle vertical direction, and left and right in the vehicle width direction, respectively, unless otherwise specified.

<First Embodiment>
First, the first embodiment will be described.

  FIG. 1 shows a vehicle 12 to which a vehicular rear seat occupant protection airbag device 10 according to the present embodiment is applied. A front seat 16 as a passenger seat is disposed on the right front side of the cabin 14 of the vehicle 12. A rear seat 28 is disposed on the right rear side of the cabin 14, that is, on the vehicle rear side of the front seat 16. A driver's seat (not shown) is arranged on the left front side of the cabin 14, and a rear seat (not shown) is arranged on the left rear side of the cabin 14.

  The front seat 16 is provided at a front seat seat cushion 16A, a front seat back 16B provided at a rear end portion of the front seat seat cushion 16A so as to be tiltable in the vehicle front-rear direction, and an upper end portion of the front seat seat back 16B. And a front seat headrest 16C. The front seat cushion 16 </ b> A is movable in the vehicle front-rear direction along a slide rail 20 provided on the vehicle floor 18. A passenger seat airbag device (not shown) is housed in the instrument panel 22 on the vehicle front side of the front seat 16.

  The passenger seat airbag device is a passenger seat inflator (not shown) and a front passenger seat PF that is inflated and deployed between the instrument panel 22 and a front seat occupant PF, which will be described later, when supplied with gas from the passenger seat inflator. And an airbag 24. Note that an air bag ECU 60 described later is electrically connected to the passenger seat inflator.

  The rear seat 28 is provided at a rear seat seat cushion 28A, a rear seat seat back 28B provided at the rear end portion of the rear seat seat cushion 28A so as to be tiltable in the vehicle longitudinal direction, and an upper end portion of the rear seat seat back 28B. And a rear seat headrest 28C. The rear seat cushion 28 </ b> A is movable in the vehicle front-rear direction along a slide rail 30 provided on the vehicle floor 18.

  On the front seat 16, a crash test dummy (dummy doll) PF simulating an occupant is seated (installed). Similarly, a dummy (dummy doll) PR for a collision test simulating an occupant is seated (installed) in the rear seat 28. As these dummy PF and PR, Hybrid-3 AM50 (50th percentile of an American adult male) or the like is used.

  The dummy PF and PR are respectively seated on the front seat 16 and the rear seat 28 in a standard seating posture determined by the collision test method. Further, the position of the front seat seat cushion 16A in the vehicle front-rear direction and the inclination angle (inclination angle) of the front seat back 16B relative to the front seat cushion 16A are adjusted to a reference position corresponding to the above-described seating posture of the dummy PF. Yes. Similarly, the position of the rear seat cushion 28A in the vehicle front-rear direction and the tilt angle of the rear seat back 28B relative to the rear seat cushion 28A are adjusted to the reference position corresponding to the seating posture of the dummy PR. . Hereinafter, for convenience of explanation, a dummy PF seated on the front seat 16 is referred to as a front seat occupant PF, and a dummy PR seated on the rear seat 28 is referred to as a rear seat occupant PR.

(Configuration of rear seat occupant protection airbag device for vehicle)
FIG. 1 shows an operating state of a vehicle rear seat occupant protection airbag device (hereinafter simply referred to as an “airbag device”). The airbag device 10 includes a curtain airbag 50, a curtain airbag inflator (hereinafter referred to as "CSA inflator") 58, a front-impact airbag 70, a reaction force strap 80, and an airbag ECU 60. I have.

  As an example, the curtain airbag 50 is formed in a bag shape by joining the outer peripheral portions of two overlapped base fabrics by sewing. The curtain airbag 50 is wound in a long roll shape, and the CSA inflator 58 (see FIG. 1) is provided in the roof side portion 32 provided at the upper end of the vehicle side portion 12S (see FIG. 2). Stored together. The curtain airbag 50 is accommodated in the roof side portion 32 from the rear end portion of the front pillar 34 to the upper end portion of a rear pillar (not shown).

  As shown in FIG. 2, the roof side portion 32 includes a roof side rail 36 and an outer portion 38 </ b> A on the outer side in the vehicle width direction of the roof head lining 38. A curtain airbag 50 (see FIG. 1) is accommodated between the roof side rail 36 and the outer portion 38A of the roof head lining 38. The roof side rail 36 is joined to the end of the roof panel 37 on the outer side in the vehicle width direction. In FIG. 2, the slide rail 30 is not shown.

  The rear seat 28 is provided with a three-point seat belt 40 having a waist belt portion 40A. The seat belt 40 is not shown in FIG. A rear side door 42 having a side window glass 44 at the top is provided outside the rear seat 28 in the vehicle width direction. The rear side door 42 constitutes the vehicle side portion 12S.

  As shown in FIG. 1, the CSA inflator 58 as a gas generator is formed in a cylindrical shape. The CSA inflator 58 is housed in the roof side portion 32 on the vehicle upper side of the center pillar (not shown) with the longitudinal direction as the vehicle longitudinal direction. Further, a gas jetting portion (not shown) for jetting gas into the curtain airbag 50 is provided at one end portion in the longitudinal direction of the CSA inflator 58. An ignition device (squib) (not shown) is provided at the end of the CSA inflator 58. An air bag ECU 60 described later is electrically connected to the ignition device.

  The curtain airbag 50 is supplied with gas from the CSA inflator 58 and is inflated and deployed in a curtain shape from the roof side portion 32 to the vehicle lower side. The curtain airbag 50 is inflated and deployed along the vehicle vertical direction and the vehicle front-rear direction inside the side window glass of the front side door (not shown) and the side window glass 44 of the rear side door 42 in the vehicle width direction.

  The curtain airbag 50 includes a front main chamber 52F and a rear main chamber 52R as inflating portions, a gas flow path 54 connecting the front main chamber 52F and the rear main chamber 52R, and a non-inflating portion 56. ing. The front main chamber 52F is provided on the front side of the curtain airbag 50 in correspondence with the head protection area of the front seat occupant PF. The front main chamber 52F is inflated and deployed between the head H of the front seat occupant PF and a side window glass (not shown) on the front seat 16 side.

  The rear main chamber 52R is provided on the vehicle rear side of the curtain airbag 50 corresponding to the head protection area of the rear seat occupant PR. The rear main chamber 52R is inflated and deployed between the head H of the rear seat occupant PR and the side window glass 44 (see FIG. 2) on the rear seat 28 side. The gas flow path 54 connects the front main chamber 52F and the rear main chamber 52R in the vehicle front-rear direction along the upper end portion of the curtain airbag 50. A non-expandable portion 56 is provided below the gas flow path 54 in the vehicle.

  As shown in FIG. 3, the non-inflatable portion 56 is an island-like non-inflatable region into which gas does not flow by sewing two base fabrics in an annular shape along the outer peripheral portion thereof. The non-inflatable portion 56 is provided across the curtain airbag 50 and a front-impact airbag 70 described later. The non-inflatable portion 56 includes a non-inflatable portion 56A on the curtain airbag 50 side and a non-inflatable portion 56B on the front airbag 70 side.

  As shown in FIG. 1, the vehicle 12 is provided with an airbag ECU 60 as a control device. A collision sensor 62 and a prevention sensor 64 are electrically connected to the airbag ECU 60. The collision sensor 62 can detect various collisions such as a frontal collision, an oblique collision, a minute lap collision, and a side collision with respect to the vehicle 12. The collision sensor 62 outputs the detected collision information to the airbag ECU 60 as an electrical signal. The preventive sensor 64 is capable of predicting various collisions such as a frontal collision, oblique collision, minute lap collision, and side collision with the vehicle 12 (predicting inevitable collisions). This preventive sensor 64 outputs the predicted collision information to the airbag ECU 60 as an electrical signal. The airbag ECU 60 controls the passenger seat inflator and the CSA inflator 58 (not shown) based on the collision information input from the collision sensor 62 and the prevention sensor 64. A method for controlling the passenger seat inflator and the CSA inflator 58 by the airbag ECU 60 will be described later together with the operations and effects of the present embodiment.

(Configuration of front impact airbag)
1 and 2 show a front collision airbag 70 in an inflated and deployed state. As shown in FIG. 1, the front airbag 70 is supplied with gas from the curtain airbag 50, and is inflated and deployed from the lower end portion 50 </ b> L of the curtain airbag 50 inward in the vehicle width direction. It is disposed between the back 16B and the rear seat occupant PR seated on the rear seat back 28B. The front collision airbag 70 is disposed in a position where the head H of the rear seat occupant PR that has moved to the front side of the vehicle at the time of the front collision can be restrained in the inflated and deployed state.

  Specifically, the front-impact airbag 70 is disposed on the thigh L of the rear seat occupant PR and on the front side of the chest C of the rear seat occupant PR in the inflated and deployed state. In other words, the front impact airbag 70 is disposed on the rear seat cushion 28A and on the front side of the vehicle above the rear seat seat back 28B in the inflated and deployed state.

  The front and rear airbag 70 is inflated and deployed in the vertical direction of the vehicle, for example, on the vehicle upper side of the abdomen B of the rear seat occupant PR, depending on the physique of the rear seat occupant PR to be restrained, and It is set within the range below the vehicle from the upper part of the head H of the rear seat occupant PR (the upper half of the head H).

  As shown in FIG. 3, the front-impact airbag 70 has a rectangular shape in a planar deployed state. FIG. 3 shows the upper surface of the front-impact airbag 70 that faces the vehicle upper side in the inflated and deployed state. The front-impact airbag 70 includes a front chamber 72 and a rear chamber 74 as inflating portions, a gas flow path 76 that connects the front chamber 72 and the rear chamber 74, and the non-inflating portion 56B described above. doing.

  The front chamber 72 is disposed on the front side of the non-inflatable portion 56B, and is connected (communicated) to the lower end portion 50L of the curtain airbag 50. On the other hand, the rear chamber 74 is disposed on the rear side of the non-inflatable portion 56B, and is connected (communicated) with the lower end portion 50L of the curtain airbag 50. The front-side chamber 72 and the rear-side chamber 74 are connected (communicated) to each other in the vehicle width direction.

  As shown in FIG. 2, when the inflated and deployed state of the curtain airbag 50 and the front impact airbag 70 is viewed from the front side of the vehicle, the curtain airbag 50 and the front impact airbag 70 have an L shape. Yes. The upper portion 50U of the curtain airbag 50 and the intermediate portion 70M in the vehicle width direction of the front impact airbag 70 are connected by a reaction force strap 80.

  The reaction force strap 80 is formed in a band shape by the same kind of base fabric as the curtain airbag 50, for example. One end portion 80A in the longitudinal direction of the reaction strap 80 is joined to the non-inflatable portion 56B of the intermediate portion 70M of the front impact airbag 70 by sewing. More specifically, as shown in FIG. 3, one end portion 80A of the reaction force strap 80 is joined to the edge portion 56B1 on the front chamber 72 side of the non-inflatable portion 56B by sewing. On the other hand, the other end 80B in the longitudinal direction of the reaction force strap 80 is sewn to the corner 56A1 on the vehicle upper side and the vehicle rear side of the non-inflatable portion 56A on the curtain airbag 50 side, as shown in FIG. It is joined.

  Tension is applied to the reaction strap 80 from the curtain airbag 50 and the front impact airbag 70 as the curtain airbag 50 and the front impact airbag 70 are inflated and deployed. As a result, the reaction force strap 80 is tension-deployed and stretched between the curtain airbag 50 and the front impact airbag 70. Further, when the deployed reaction force strap 80 is viewed from the inside in the vehicle width direction, the reaction force strap 80 extends from the front impact airbag 70 to the vehicle upper side and the vehicle rear side. The reaction force strap 80 suppresses deformation of the front airbag 70 with respect to the curtain airbag 50 toward the vehicle front side and the vehicle lower side.

  Next, how to fold the front airbag 70 will be described. As shown in FIG. 3, the front airbag 70 is folded along the lower end portion 50L of the curtain airbag 50 and overlapped on the inner surface of the curtain airbag 50 facing inward in the vehicle width direction in the inflated and deployed state. . At this time, the reaction force strap 80 is folded between the curtain airbag 50 and the front impact airbag 70. In this state, the curtain airbag 50 and the front impact airbag 70 are wound in a roll shape and stored in the roof side portion 32 (see FIG. 1). FIG. 3 shows a fold W of the front airbag 70.

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

(Operation at the time of front collision)
First, the effect | action at the time of the front collision with respect to the vehicle 12 is demonstrated. As shown in FIG. 1, when the airbag ECU 60 detects or predicts a front collision with the vehicle 12 based on collision information from the collision sensor 62 and the prevention sensor 64, the airbag ECU 60 activates a passenger seat inflator (not shown). As a result, the passenger seat airbag 24 is inflated and deployed between the instrument panel 22 and the front seat occupant PF. As a result, the head H of the front seat occupant PF that has moved inertially toward the front of the vehicle due to the front collision is restrained by the passenger seat airbag 24.

  Further, the airbag ECU 60 activates the CSA inflator 58. As a result, gas is supplied into the curtain airbag 50 from the gas ejection portion of the CSA inflator 58. As a result, the curtain airbag 50 is inflated and deployed on the inner side in the vehicle width direction of the side window glass (not shown) on the front seat 16 side and the side window glass 44 on the rear seat 28 side.

  When the curtain airbag 50 is inflated and deployed, gas is supplied from the curtain airbag 50, and the front impact airbag 70 is inflated and deployed from the lower end portion 50L of the curtain airbag 50 toward the inside in the vehicle width direction. It is arranged between the front seat back 16B and the rear seat occupant PR. As a result, as shown by a solid line in FIG. 4, the head H of the rear seat occupant PR that has inertially moved to the vehicle front side and the vehicle lower side with the front collision is restrained by the front collision airbag 70.

  Here, when the rear-seat occupant PR is restrained by the front impact airbag 70, if the front impact airbag 70 is deformed toward the vehicle front side or the vehicle lower side with respect to the curtain airbag 50, the front impact airbag. There is a possibility that the restraining force of the head H of the rear seat occupant PR 70 by 70 is reduced.

  On the other hand, in the present embodiment, the intermediate portion 70M of the front airbag 70 and the upper portion 50U of the curtain airbag 50 are connected by the reaction force strap 80. The reaction strap 80 prevents the front airbag 70 from being deformed toward the vehicle front side or the vehicle lower side with respect to the curtain airbag 50. Therefore, the restraining performance of the head H of the rear seat occupant PR by the front collision airbag 70 is improved.

  Further, when the deployed reaction force strap 80 is viewed from the inside in the vehicle width direction, the reaction force strap 80 extends from the front impact airbag 70 to the vehicle upper side and the vehicle rear side. Thereby, the deformation | transformation to the vehicle front side and the vehicle lower side of the airbag 70 for front collision with respect to the curtain airbag 50 can be suppressed efficiently. Therefore, the restraining performance of the head H of the rear seat occupant PR by the front collision airbag 70 is further improved.

  Further, the front airbag 70 is disposed in front of the chest C of the rear seat occupant PR on the thigh L of the rear seat occupant PR in the inflated and deployed state. Here, at the time of a front collision, the upper body of the rear seat occupant PR wearing the seat belt 40 (see FIG. 2) tilts toward the front of the vehicle around the waist (the waist belt portion 40A in FIG. 2) of the rear seat occupant PR. Thereby, the head H of the rear seat occupant PR is swung down to the vehicle front side and the vehicle lower side. The head H of the rear seat occupant PR is in contact with the front collision airbag 70 from above the vehicle.

  On the other hand, the arm portion A of the rear seat occupant PR is swung up onto the thigh L of the rear seat occupant PR. The arm portion A contacts the front impact airbag 70 from the lower side of the vehicle. That is, the front airbag 70 is sandwiched between the head H and the arm A of the rear seat occupant PR, and restrains the head H and the arm A in this state. In other words, the front impact airbag 70 restrains the head H by taking a reaction force on the arm portion A of the rear seat occupant PR to be swung up. Therefore, the restraining performance of the head H of the rear seat occupant PR by the front collision airbag 70 is improved.

  Further, FIGS. 5A and 5B schematically show the deployment process of the curtain airbag 50 and the front-impact airbag 70. 5A and 5B, illustration of the rear seat 28 and the like is omitted.

  As shown in FIGS. 5 (A) and 5 (B), the front-impact airbag 70 is moved from the state of being overlapped with the inner side surface of the curtain airbag 50 on the inner side in the vehicle width direction to the inner side in the vehicle width direction. Expands like a. Thus, the front collision airbag 70 is prevented from interfering with the rear side door 42 when the front collision airbag 70 is inflated and deployed. Therefore, the front collision airbag 70 can be stably deployed.

(Action at the time of side collision)
Next, the action at the time of a side collision with respect to the vehicle 12 will be described. When the airbag ECU 60 detects or predicts a side collision with the vehicle 12 based on the collision information from the collision sensor 62 and the prevention sensor 64, the airbag ECU 60 activates the CSA inflator 58. As a result, as described above, the curtain airbag 50 is inflated and deployed. Thereby, the head seat H of the front seat occupant PF and the rear seat occupant PR that have moved inertially outward in the vehicle width direction due to the side collision is the front main chamber 52F and the rear main chamber of the inflated and deployed curtain airbag 50. It is restrained by 52R.

  Further, as described above, when the curtain airbag 50 is inflated and deployed, the front-impact airbag 70 is inflated and deployed. However, the front airbag 70 is inflated and deployed on the vehicle front side of the rear seat occupant PR. Therefore, it is possible to suppress the front collision airbag 70 from interfering with the rear seat occupant PR at the time of a side collision. Furthermore, the other end portion 80B of the reaction force strap 80 is joined to the vehicle front side with respect to the rear main chamber 52R in the curtain airbag 50. Thereby, it is suppressed that the reaction force strap 80 interferes with the rear seat occupant PR at the time of a side collision. Therefore, the head H of the rear seat occupant PR can be effectively restrained by the rear main chamber 52R at the time of a side collision.

Second Embodiment
Next, a second embodiment will be described. Note that in the second embodiment, members having the same configurations as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.

  As shown in FIGS. 6 and 7, the airbag device 90 according to this embodiment includes a lower limb reaction force airbag 92. The lower limb reaction force airbag 92 is provided at a rear end portion 70 </ b> R (see FIG. 6) of the front impact airbag 70 on the vehicle rear side. The lower limb reaction force airbag 92 is connected (communication) to the front-impact airbag 70. The lower limb reaction force airbag 92 is supplied with gas from the front-impact airbag 70, and is inflated and deployed from the rear end portion 70R of the front-impact airbag 70 to the vehicle rear side and the vehicle lower side. The The lower limb reaction force airbag 92 faces the chest C of the rear seat occupant PR in the vehicle front-rear direction in the inflated and deployed state.

  As shown in FIG. 8, the lower limb reaction force airbag 92 has a rectangular shape in a planar deployed state. FIG. 8 shows the upper surfaces of the front-impact airbag 70 and the lower-limb reaction force airbag 92 that face the upper side of the vehicle in the inflated and deployed state. The lower limb reaction force airbag 92 includes an inflating portion 94, a gas flow path 96, and a non-inflating portion 98. The inflatable portion 94 is connected to the rear end portion 70 </ b> R of the front collision airbag 70 via the gas flow path 96. Gas is supplied to the inflating portion 94 from the front impact airbag 70 via the gas flow path 96. The non-inflatable part 98 is provided in the center part of the leg reaction force airbag 92 along the vehicle width direction.

  Next, how to fold the front impact airbag 70 and the lower limb reaction force airbag 92 will be described. The lower limb reaction force airbag 92 is folded along the rear end portion 70R of the front-impact airbag 70 and overlaps the lower surface of the front-impact airbag 70 facing the vehicle lower side in the inflated and deployed state. In this state, the lower limb reaction force airbag 92 and the front impact airbag 70 are folded along the lower end portion 50L of the curtain airbag 50, and the inner surface of the curtain airbag 50 faces inward in the vehicle width direction in the inflated and deployed state. Is superimposed on. At this time, the reaction force strap 80 is folded between the curtain airbag 50 and the front impact airbag 70. In this state, the curtain airbag 50, the front impact airbag 70, and the lower limb reaction force airbag 92 are wound into a roll shape and stored in the roof side portion 32 (see FIG. 6). FIG. 8 shows a fold W1 of the leg reaction force airbag 92.

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

  When the airbag ECU 60 (see FIG. 1) activates the CSA inflator 58 during the front collision, the curtain airbag 50 and the front collision airbag 70 are inflated and deployed as shown in FIG. Further, when the gas is supplied from the front impact airbag 70, the lower limb reaction force airbag 92 is inflated and deployed from the rear end portion 70R of the front impact airbag 70 to the vehicle rear side and the vehicle lower side.

  Accordingly, the chest C of the rear seat occupant PR that has moved inertially toward the front of the vehicle at the time of a front collision can be restrained by the lower limb reaction force airbag 92. Further, when the head H of the rear seat occupant PR swinged down is restrained by the front impact airbag 70 during the front impact, the lower limb reaction force airbag 92 is moved to the chest C and thigh L of the rear seat occupant PR. It is sandwiched between. As a result, the front airbag 70 can restrain the head H by applying a reaction force to the thigh L of the rear seat occupant PR via the lower limb reaction force airbag 92. Therefore, the restraining performance of the head H of the rear seat occupant PR by the front collision airbag 70 is improved.

  10A and 10B schematically show the deployment process of the curtain airbag 50, the front impact airbag 70, and the lower limb reaction force airbag 92. FIG. 10A and 10B, illustration of the rear seat 28 and the like is omitted.

  As shown in FIG. 10 (A), the front airbag 70 is deployed on the curtain airbag 50 from the inner side on the inner side in the vehicle width direction to the inner side in the vehicle width direction as indicated by an arrow b. The Thereafter, as shown in FIG. 10B, the lower limb reaction force airbag 92 superimposed on the lower surface of the front impact airbag 70 is deployed to the vehicle rear side. Thereby, in this embodiment, compared with the case where the lower limb reaction force airbag 92 is overlapped on the upper surface of the front impact airbag 70, the lower limb reaction force airbag 92 allows the chest C of the rear seat occupant PR to be moved earlier. Can be restrained.

  The lower limb reaction force airbag 92 only needs to be inflated and deployed on the vehicle lower side than the front-impact airbag 70, and the inflating and deploying direction can be appropriately changed. Therefore, for example, the lower limb reaction force airbag 92 may be inflated and deployed from the rear end portion 70R of the front impact airbag 70 to the vehicle lower side, or from the rear end portion 70R to the vehicle lower side and the vehicle front side. It may be expanded and expanded.

<Third Embodiment>
Next, a third embodiment will be described. Note that in the third embodiment, members having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  As shown in FIGS. 11 and 12, the airbag device 100 according to the present embodiment includes a head restraint airbag 102. As shown in FIG. 11, the head restraint airbag 102 is provided at the rear end portion 70 </ b> R of the front-impact airbag 70. The head restraint airbag 102 is connected (communication) to the front-impact airbag 70. Further, the head restraint airbag 102 is inflated and deployed from the rear end portion 70 </ b> R of the front collision airbag 70 upon receiving the supply of gas from the front collision airbag 70. As indicated by an arrow V, the head restraint airbag 102 is rotatable in the vehicle vertical direction around the rear end portion 70R of the front-impact airbag 70.

  As shown in FIG. 13, the head restraint airbag 102 has a rectangular shape in a planar deployed state. FIG. 13 shows the upper surfaces of the front-impact airbag 70 and the head restraint airbag 102 that face the upper side of the vehicle in the inflated and deployed state. The head restraint airbag 102 includes an inflating part 104, a gas flow path 106, and a non-inflating part 108. The inflatable portion 104 is connected to the rear end portion 70 </ b> R of the front impact airbag 70 via the gas flow path 106. Gas is supplied to the inflating portion 104 from the front-impact airbag 70 via the gas flow path 106. The non-inflatable portion 108 is provided in the center portion of the head restraint airbag 102 along the vehicle width direction.

  A slit 112 through which the holding strap 110 is passed is formed in the non-inflatable portion 108. For example, the holding strap 110 is formed in a belt shape by a base fabric of the same type as the base fabric of the front impact airbag 70. One end portion 110 </ b> A in the longitudinal direction of the holding strap 110 is joined to the intermediate portion 70 </ b> M of the front impact airbag 70.

  On the other hand, the other end portion 110B in the longitudinal direction of the holding strap 110 passes through the slit 112 from the front of the vehicle, and as shown by the corner portion 56A1 of the non-inflatable portion 56A on the curtain airbag 50 side or a two-dot chain line in FIG. It is joined to a skeleton member such as the roof side rail 36. As shown in FIGS. 11 and 12, the head restraint airbag 102 is held by the holding strap 110 in a state of being rotated to the vehicle upper side with respect to the front collision airbag 70. In other words, the head restraint airbag 102 is held on the upper side of the vehicle with respect to the front collision airbag 70 by the holding strap 110. The head restraint airbag 102 is extended from the rear end portion 70 </ b> R of the front-impact airbag 70 to the vehicle upper side and the vehicle front side while being held by the holding strap 110.

  Next, as shown in FIG. 13, how to fold the front-impact airbag 70 and the head restraint airbag 102 will be described. The head restraint airbag 102 is folded along the rear end portion 70R of the front impact airbag 70 at the fold line W2, and is superimposed on the upper surface of the front impact airbag 70 facing the vehicle upper side in the inflated and deployed state. In this state, the front airbag 70 and the head restraint airbag 102 are folded along the lower end portion 50L of the curtain airbag 50 at the fold line W, and the curtain airbag faces inward in the vehicle width direction in the inflated and deployed state. 50 is overlapped on the inner surface. At this time, the reaction strap 80 and the holding strap 110 are folded between the curtain airbag 50 and the front airbag 70. In this state, the curtain airbag 50, the front impact airbag 70, and the head restraint airbag 102 are wound in a roll shape and stored in the roof side portion 32 (see FIG. 11).

  Further, the vehicle 12 releases the holding of the head restraint airbag 102 by the holding strap 110 and rotates the head restraint airbag 102 to the lower side of the vehicle with respect to the front collision airbag 70. Is provided. The release device includes, for example, a cutter and an actuator that moves the cutter and cuts the holding strap 110. The release device is provided, for example, on the roof side portion 32 or the vehicle ceiling portion according to the position of the holding strap 110. Further, the airbag ECU 60 is electrically connected to the release device.

  Further, the vehicle 12 is provided with a head detection device (not shown) that detects the position of the head H of the rear seat occupant PR. The head detection device is, for example, a camera that captures the head H of the rear seat occupant PR. Further, an airbag ECU 60 (see FIG. 1) is electrically connected to the head detecting device. The head detection device detects the position of the head H of the rear seat occupant PR and outputs the detected position to the airbag ECU 60. The airbag ECU 60 controls the above-described release device based on the position information of the head H of the rear seat occupant PR detected by the head detection device. A method for controlling the release device by the airbag ECU 60 will be described later together with the operations and effects of this embodiment.

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

  When the airbag ECU 60 (see FIG. 1) operates the CSA inflator 58 during the front collision, the curtain airbag 50 and the front collision airbag 70 are inflated and deployed as shown in FIG. Further, upon receiving the supply of gas from the front-impact airbag 70, the head restraint airbag 102 tends to inflate and deploy from the rear end portion 70R of the front-impact airbag 70 to the vehicle rear side.

  Here, the airbag ECU 60 uses the position information of the head H of the rear seat occupant PR detected by the head detection device, and the head H of the rear seat occupant PR with respect to the front airbag 70 in the inflated and deployed state. The position of the vehicle in the vertical direction is determined. For example, as shown in FIG. 12, when the airbag ECU 60 determines that the center X2 of the head H is on the vehicle upper side of the center X1 in the vehicle vertical direction of the front-impact airbag 70 in the inflated and deployed state. In this case, the airbag ECU 60 does not operate the release device. In this case, the head restraint airbag 102 is held on the vehicle upper side of the front collision airbag 70 by the holding strap 110.

  In this state, as shown in FIG. 11, when the head H of the rear seat occupant PR is swung down due to the front collision, first, the head H of the rear seat occupant PR is restrained by the head restraint airbag 102. Is done. Next, when the head H of the rear seat occupant PR is further swung down, the head H is restrained by the front impact airbag 70 via the head restraint airbag 102. Therefore, in the present embodiment, the head H of the rear seat occupant PR can be restrained earlier compared to the case where the head restraint airbag 102 is not provided in the front collision airbag 70. Therefore, the restraining performance of the head H of the rear seat occupant PR by the front collision airbag 70 is improved.

  On the other hand, as shown by a two-dot chain line in FIG. 14, for example, if the rear seat occupant PR is small in size, the center X2 of the head H is below the center X1 of the front impact airbag 70. When the airbag ECU 60 determines, the airbag ECU 60 operates the release device. Thereby, the holding strap 110 is cut by the cutter, and the holding of the head restraint airbag 102 by the holding strap 110 is released. As a result, the head restraint airbag 102 is rotated to the vehicle lower side by its own weight with respect to the front collision airbag 70, and is disposed on the vehicle lower side than the front collision airbag 70. In this case, the head H of the rear seat occupant PR indicated by a two-dot chain line is restrained by the head restraint airbag 102. In FIG. 14, the holding strap 110 is not shown.

  15A and 15B schematically show the deployment process of the curtain airbag 50, the front-impact airbag 70, and the head restraint airbag 102. FIG. 15A and 15B, illustration of the rear seat 28 and the like is omitted.

  As shown in FIG. 15A, the front airbag 70 and the head restraint airbag 102 are placed on the curtain airbag 50 from the inner side on the inner side in the vehicle width direction to the inner side in the vehicle width direction. Expanded as indicated by arrow c. Thereafter, the head restraint airbag 102 overlaid on the upper surface of the front impact airbag 70 is deployed to the vehicle rear side. Thereby, in this embodiment, compared with the case where the head restraint airbag 102 is overlaid on the lower surface of the front-impact airbag 70, the head restraint airbag 102 causes the head H of the rear seat occupant PR to be moved earlier. Can be restrained.

  In the present embodiment, the head restraint airbag 102 is rotatable with respect to the front-impact airbag 70, but the present embodiment is not limited to this. The head restraint airbag 102 may be formed so as to be inflated and deployed on the vehicle upper side than the front-impact airbag 70. In this case, the holding strap 110 becomes unnecessary. Further, the inflating and deploying direction of the head restraint airbag relative to the front collision airbag 70 can be changed as appropriate. Therefore, the head restraint airbag 102 is inflated from the rear end portion 70R of the front impact airbag 70 to the rear side of the vehicle and the upper side of the vehicle, for example, as a head restraint airbag 122 (see FIG. 16) described later. You may make it expand | deploy and may expand-deploy from the said rear-end part 70R to the vehicle upper side.

  Further, as the release device, for example, a release device including a rod and an actuator that moves the rod may be used. This release device is provided, for example, on the roof side rail 36 (see FIG. 12), and the other end portion 110B, the roof side rail 36, and the other end portion 110B are inserted into the through hole of the other end portion 110B of the holding strap 110. Are connected. In this state, when the front impact airbag 70 and the head restraint airbag 102 are inflated and deployed, the head restraint airbag 102 is held on the vehicle upper side than the front impact airbag 70 by the holding strap 110.

  On the other hand, when releasing the holding of the head restraint airbag 102 by the holding strap 110, the rod is moved by the actuator, and the rod is extracted from the through hole of the other end portion 110 </ b> B of the holding strap 110. As a result, the connection state between the other end portion 110B of the holding strap 110 and the roof side rail 36 is released. As a result, the holding of the head restraint airbag 102 by the holding strap 110 is released, and the head restraint airbag 102 is rotated downward with respect to the front impact airbag 70.

<Fourth embodiment>
Next, a fourth embodiment will be described. Note that in the fourth embodiment, members having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  As shown in FIG. 16, the airbag device 120 according to the present embodiment includes a head restraint airbag 122 and a front-impact inflator 126. The head restraint airbag 122 is provided at the rear end portion 70 </ b> R of the front impact airbag 70. The head restraint airbag 122 is inflated and deployed from the rear end portion 70 </ b> R of the front collision airbag 70 to the rear side of the vehicle and the upper side of the vehicle upon receiving gas supply from the front collision airbag 70.

  As shown in FIG. 17, the head restraint airbag 122 has an inflating part 104, a gas flow path 106, and a non-inflating part 108, similar to the head restraint airbag 102 (see FIG. 13) described above. ing. A tubular gas introduction portion 124 is connected to a rear end portion 122R of the head restraint airbag 122 on the vehicle rear side. A front collision inflator 126 is connected to the gas introduction portion 124.

  The front impact airbag 70 and the curtain airbag 50 are partitioned by a partition 128 that extends along the lower end 50L of the curtain airbag 50. The partition part 128 is formed by joining the two base fabrics which the curtain airbag 50 comprises by sewing. The partition portion 128 prevents gas from flowing between the curtain airbag 50 and the front collision airbag 70.

  The front impact inflator 126 (see FIG. 16) as a gas generator is accommodated in, for example, a roof side portion 32 on the vehicle upper side of a rear pillar (not shown). Gas is supplied from the front impact inflator 126 to the head restraint airbag 122 and the front impact airbag 70 through the gas introduction portion 124. Note that an airbag ECU 60 (see FIG. 1) is electrically connected to the front impact inflator 126. The airbag ECU 60 controls the front impact inflator 126. A method of controlling the front impact inflator 126 by the airbag ECU 60 will be described later along with the operations and effects of this embodiment.

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

(Operation at the time of front collision)
When the airbag ECU 60 (see FIG. 1) detects or predicts a front collision with the vehicle 12 based on the collision information from the collision sensor 62 and the prevention sensor 64, as shown in FIG. 16, the CSA inflator 58 (FIG. 1). And the front impact inflator 126 is activated. As a result, the curtain airbag 50 is inflated and deployed in response to the supply of gas from the CSA inflator 58. Further, upon receiving a gas supply from the front impact inflator 126, the front impact airbag 70 and the head restraint airbag 122 are inflated and deployed. As a result, the head H of the rear seat occupant PR swung down to the vehicle front side and the vehicle lower side in accordance with the front collision is restrained by the front collision airbag 70 and the head restraint airbag 122.

  As described above, in the present embodiment, the front-impact airbag 70 and the head restraint airbag 122 are inflated and deployed by the front-projection inflator 126 different from the CSA inflator 58. Thereby, in this embodiment, compared with the case where the front-impact airbag 70 and the head restraint airbag 122 are inflated by receiving gas supply from the CSA inflator 58 via the curtain airbag 50. The front impact airbag 70 and the head restraint airbag 122 can be inflated and deployed at an early stage. Further, the deployment timing and the back inner pressure of the front airbag 70 can be adjusted by the rear seat 28 alone.

(Action at the time of side collision)
When the airbag ECU 60 detects or predicts a side collision with the vehicle 12 based on the collision information from the collision sensor 62 and the prevention sensor 64, the airbag ECU 60 activates the CSA inflator 58 without operating the front collision inflator 126. As a result, the curtain airbag 50 is inflated and deployed in response to the supply of gas from the CSA inflator 58. As a result, the head H of the rear seat occupant PR that is inertial outward in the vehicle width direction due to a side collision is restrained by the rear main chamber 52R of the curtain airbag 50.

  As described above, in the present embodiment, the front collision inflator 126 does not operate during a side collision, and the front collision airbag 70 and the head restraint airbag 122 are not inflated and deployed. Therefore, interference between the front-impact airbag 70 and the head restraint airbag 122 with respect to the rear seat occupant PR is prevented.

  The airbag ECU 60 controls the front impact inflator 126 based on the presence or absence of the rear seat occupant PR detected by, for example, a load sensor provided on the rear seat seat cushion 28A or a belt wearing sensor of the seat belt 40. May be. Specifically, when the airbag ECU 60 determines that there is a rear seat occupant PR in the rear seat 28 based on the presence / absence information of the rear seat occupant PR detected by a load sensor or a belt wearing sensor at the time of a vehicle collision. Then, the front impact inflator 126 and the CSA inflator 58 are operated. On the other hand, if the airbag ECU 60 determines that there is no rear seat occupant PR in the rear seat 28, the airbag ECU 60 operates the CSA inflator 58 without operating the front collision inflator 126. Thereby, the operation | movement of the unnecessary front inflator 126 can be prevented.

  In the present embodiment, the gas introduction part 124 is connected to the head restraint airbag 122, but the gas introduction part 124 may be connected to the front collision airbag 70. In this case, the head restraint airbag 122 can be omitted as appropriate.

<Fifth Embodiment>
Next, a fifth embodiment will be described. Note that in the fifth embodiment, members having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  As shown in FIG. 18, the airbag apparatus 130 according to the present embodiment includes an electric slide mechanism 132 that moves the front seat cushion 16A in the vehicle front-rear direction, and the tilt of the front seat back 16B relative to the front seat cushion 16A. An electric reclining mechanism (not shown) for changing the angle (reclining angle) is provided. The airbag ECU 60 is connected to the electric slide mechanism 132 and the electric reclining mechanism as the front seat moving means (front seat moving mechanism).

  The electric slide mechanism 132 includes, for example, a ball screw mechanism that moves the front seat cushion 16 </ b> A along the slide rail 20. The electric slide mechanism 132 outputs the position of the front seat cushion 16 </ b> A in the vehicle front-rear direction to the airbag ECU 60. The electric reclining mechanism outputs the tilt angle of the rear seat back 28B to the airbag ECU 60.

  The airbag ECU 60 calculates the position of the front seat 16 from the position of the front seat cushion 16A and the tilt angle of the front seat back 16B input from the electric slide mechanism 132 and the electric reclining mechanism. The airbag ECU 60 controls the electric slide mechanism 132 and the electric reclining mechanism based on the calculated position of the front seat 16. Note that the control method of the electric slide mechanism 132 and the electric reclining mechanism by the airbag ECU 60 will be described later together with the operations and effects of this embodiment.

(Function and effect)
Next, functions and effects of the fifth embodiment will be described.

  As shown in FIG. 18, when the airbag ECU 60 predicts a front collision with the vehicle 12 based on the collision information from the prevention sensor 64, first, the airbag ECU 60 calculates the position of the front seat 16. Specifically, the airbag ECU 60 calculates the position of the front seat 16 based on the position of the front seat cushion 16A and the tilt angle of the front seat back 16B input from the electric slide mechanism 132 and the electric reclining mechanism. . Next, the airbag ECU 60 determines whether or not a part of the front seat 16 is located in the inflated / deployed region of the front airbag 70 from the calculated position of the front seat 16. Note that the inflated and deployed region of the front impact airbag 70 is stored in the airbag ECU 60 in advance.

  When the airbag ECU 60 determines that a part of the front seat 16 (the front seat headrest 16C indicated by a two-dot chain line in FIG. 18) is located in the inflating and deploying region of the front collision airbag 70, the airbag ECU 60 The electric reclining mechanism is actuated to move the front seat 16 to the front side of the vehicle, and the front seat headrest 16C is disposed outside the inflating and deploying region of the front collision airbag 70. At this time, it is also possible to operate the electric slide mechanism 132 to move the entire front seat 16 to the front side of the vehicle.

  Thereafter, the airbag ECU 60 activates the CSA inflator 58 to inflate and deploy the curtain airbag 50 and the front impact airbag 70. Thereby, it is suppressed by the front seat headrest 16C that the expansion | deployment deployment of the airbag 70 for front collisions is inhibited. Therefore, the rear seat occupant PR can be restrained by the front collision airbag 70.

  The airbag ECU 60 can also control the electric slide mechanism 132 and the electric reclining mechanism based on the position of the front seat 16 detected by a camera or the like. The airbag ECU 60 can control at least one of the electric slide mechanism 132 and the electric reclining mechanism.

  Further, when the airbag ECU 60 predicts a frontal collision with the vehicle 12 and determines that the rear seat 28 is located outside the predetermined area, the airbag ECU 60 operates the rear seat 28 as a rear seat moving means (rear seat moving mechanism). At least one of the slide mechanism 134 and the electric reclining mechanism (not shown) may be operated. Then, the rear seat 28 is moved in the vehicle front-rear direction, and the rear seat 28 is arranged in a predetermined area. As a result, the distance between the inflated and deployed front impact airbag 70 and the rear seat occupant PR can be within a predetermined range. Therefore, the rear seat occupant PR can be effectively restrained by the front collision airbag 70. The position of the rear seat 28 can be calculated or detected by the same method as that for the front seat 16, for example.

  Here, the predetermined area of the rear seat 28 is set to, for example, the reference position of the rear seat 28 determined by the above-described collision test method or a peripheral position of the reference position. In addition, the predetermined area can have a range in the vehicle front-rear direction.

  Next, modified examples of the first to fifth embodiments will be described. In the following, various modified examples will be described taking the first embodiment as an example, but these modified examples are also applicable to the second to fifth embodiments as appropriate.

  In the first embodiment, the front impact airbag 70 extends inward in the vehicle width direction from the lower end portion 50L of the curtain airbag 50. However, the front impact airbag 70 extends from the lower portion of the curtain airbag 50 to the vehicle width. It is also possible to extend inward in the direction.

  Further, in the first embodiment, as shown in FIG. 2, one end portion 80A of the reaction force strap 80 is connected to the intermediate portion 70M in the vehicle width direction of the front airbag 70. The embodiment is not limited to this. One end portion 80 </ b> A of the reaction strap 80 may be coupled to the inner end portion 70 </ b> T on the inner side in the vehicle width direction of the front collision airbag 70.

  Moreover, in the said 1st Embodiment, although the other end part 80B of the reaction force strap 80 is connected with the upper part 50U of the curtain airbag 50, the said 1st Embodiment is not restricted to this. The other end portion 80B of the reaction force strap 80 can be connected to, for example, a roof side rail 36 as a skeleton member on the vehicle upper side of the side window glass 44. Similarly, the other end portion 110 </ b> B (see FIG. 12) of the holding strap 110 in the third embodiment can be connected to the roof side rail 36.

  In the first embodiment, the vehicle 12 is a left-hand drive vehicle, but the vehicle 12 may be a right-hand drive vehicle. Further, the airbag device 10 according to the first embodiment is applicable to any of the left and right vehicle side portions 12S of the vehicle 12.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various embodiments can be implemented without departing from the scope.

DESCRIPTION OF SYMBOLS 10 Vehicle rear seat passenger protection airbag apparatus 12 Vehicle 16 Front seat 16B Front seat back 28 Rear seat 32 Roof side part 44 Side window glass (rear seat side window glass)
50 Curtain airbag 50L Lower end (lower part of curtain airbag)
58 Curtain airbag inflator 70 Front impact airbag 70M Intermediate portion (front impact airbag width direction intermediate portion)
70T Inner end (the inner end of the front airbag in the vehicle width direction)
70R rear end portion (rear end portion of the front impact airbag on the vehicle rear side)
80 Reaction force strap 90 Vehicle rear seat occupant protection airbag device 92 Lower limb reaction force airbag device 100 Vehicle rear seat occupant protection airbag device 102 Head restraint airbag 120 Vehicle rear seat occupant protection airbag device 122 Head restraint Airbag 126 Front impact inflator 130 Vehicle rear seat occupant protection airbag device 132 Electric slide mechanism (front seat moving means)
134 Electric slide mechanism (rear seat moving means)
B Abdomen H Head L Thigh PR Rear seat occupant

Claims (7)

An inflator for a curtain airbag provided in a vehicle;
A curtain airbag that receives supply of gas from the curtain airbag inflator and is inflated and deployed on the inner side in the vehicle width direction of the side window glass on the rear seat side;
A rear seat occupant seated on the rear seat and a front seat back of the front seat is provided at a lower portion of the curtain airbag, inflated and deployed from the lower portion to the vehicle width direction and receiving gas supply from the curtain airbag. A front-impact airbag disposed between and
A reaction force strap that connects an intermediate portion in the vehicle width direction of the front impact airbag or an inner end portion in the vehicle width direction and a skeleton member on the upper side of the curtain airbag or on the vehicle side of the side window glass;
A rear-seat occupant protection airbag device for a vehicle. The front airbag is in an inflated and deployed state on the thigh of the rear seat occupant, above the abdomen of the rear seat occupant and above the head of the rear seat occupant. Placed at the bottom,
The vehicular rear seat occupant protection airbag device according to claim 1. Lower limb reaction force that is provided at a rear end portion of the front collision airbag on the rear side of the vehicle and receives gas supply from the front collision airbag and is inflated and deployed below the front collision airbag. With an airbag,
The vehicular rear seat occupant protection airbag device according to claim 2. Head restraint air that is provided at the rear end portion of the front impact airbag on the rear side of the vehicle and receives gas supply from the front impact airbag and is inflated and deployed on the vehicle upper side of the front impact airbag With a bag,
The vehicular rear seat occupant protection airbag device according to claim 2. An inflator for a curtain airbag provided in a vehicle;
A front impact inflator provided in the vehicle;
A curtain airbag that receives supply of gas from the curtain airbag inflator and is inflated and deployed on the inner side in the vehicle width direction of the side window glass on the rear seat side;
A rear seat occupant seated in the rear seat and a front seat seat in the front seat is provided at a lower portion of the curtain airbag, is inflated and deployed in the vehicle width direction from the lower portion by receiving gas supply from the front impact inflator A front-impact airbag disposed between the bag and the back;
A reaction force strap that connects an intermediate portion in the vehicle width direction of the front impact airbag or an inner end portion in the vehicle width direction and a skeleton member on the upper side of the curtain airbag or on the vehicle side of the side window glass;
Comprising
Rear seat occupant protection airbag device for vehicles. When a front collision of the vehicle is predicted and a part of the front seat is located in the inflating and deploying region of the front impact airbag, the front seat is moved to the front side of the vehicle, and a part of the front seat is Front seat moving means disposed outside the inflated and deployed region,
The vehicular rear seat occupant protection airbag device according to any one of claims 1 to 5. When a vehicle front collision is predicted and the rear seat is located outside a predetermined area, rear seat moving means is provided for moving the rear seat in the vehicle front-rear direction and arranging the front seat within the predetermined area. ,
The vehicular rear seat occupant protection airbag device according to any one of claims 1 to 6.