JP2006082731A - Vehicle equipped with back door and airbag device for rear-end collision and airbag device for rear-end collision of vehicle equipped with back door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device for rear-end collision of a vehicle equipped with a back door capable of exerting an impact absorbing function and an occupant restraining function by spreading and inflating an airbag cushion in a position between the head of the occupant and the back door certainly even in case the seat back moves backward with the impact in the event of rear-end collision. <P>SOLUTION: The airbag device to work against rear-end collision of the vehicle includes a movement restricting member 9 to restrict the backward movement of the seat back 53 in order to generate a spreading/inflating space for the airbag cushion. Concretely the movement restricting member 9 is formed from rack members 91 and 92 protruding toward the inside of the cabin (toward the center across the vehicle width) from the trim surfaces constituting cabin side walls 10 located behind the seat back 53. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an airbag device for a rear collision in a vehicle having a back door at the rear end portion of the vehicle, such as a one-box type or a two-box type, and the vehicle, and more particularly, when a seat back (backrest) of a rear seat is a rear collision. The present invention relates to a rear-impact airbag device and a vehicle that can reliably operate the airbag device even when the vehicle moves backward due to the impact of the vehicle.

  In recent years, airbag devices have been installed at various locations for the purpose of protecting passengers in the event of a vehicle collision.

  For example, in Patent Document 1 below, an air bag device is provided on the rear header at the rear end of the roof in order to prevent a passenger seated in a rear seat from moving backward at the time of a vehicle rear collision, and the air bag of the air bag device at the time of rear collision What expands and deploys a bag cushion is disclosed.

  According to Patent Document 1, it is disclosed that not only the shock absorbing function but also the rearward movement of the occupant of the rear seat can be prevented and the prevention occupant restraining function can be obtained by the airbag device.

  Further, in Patent Document 2, by providing a deployment direction control means for guiding the inflation and deployment direction of the airbag device of Patent Document 1 along the window glass, interference with the passenger's head during deployment of the airbag cushion is prevented. What prevents and reliably operates the airbag device is disclosed.

  According to the airbag device of Patent Document 2, since the inflation and deployment direction is reliably defined and guided, it is disclosed that the occupant protection of the rear seat at the time of the rear collision can be more reliably performed.

  Furthermore, Patent Document 3 discloses an airbag device that is inflated and deployed on the rear side provided at the upper end of the rear seat back. Even in Patent Document 3, it is possible to protect the occupant of the rear seat at the time of a rear collision. It is disclosed that it can be done.

JP 2004-58849 A JP 2004-58850 A JP-A-11-198699

  By the way, in vehicles with a back door at the rear end of the vehicle, such as the one-box type and the two-box type, the rear seat is arranged so that the seat back is located immediately in front of the back door in order to secure as much cabin space as possible. There is a case.

  As described above, in a vehicle in which the seat back of the rear seat and the back door are close to each other, a large problem may occur when a large impact is received at the time of a rear collision.

  It is an impact at the time of rear impact, and the load of the occupant is applied rearward with respect to the seat back, and the upper end of the seat back moves rearward (if the seat back warps backward due to elastic deformation or the hinge at the lower end of the seat back Such as when the seat breaks back and the seat back moves backward), the passenger's head and the back door are very close to each other, and the airbag cushion cannot be deployed and inflated between them.

  This problem will be described with reference to a state explanatory diagram shown in FIG. (A) is a vehicle rear side view showing a seating state of an occupant at a normal time, and (b) is a vehicle rear side view showing a movement state of the occupant at a rear collision.

  As shown to (a), since passenger | crew P is sitting in the state which put the back on the seat back 201 of the backseat 200 installed in the vehicle interior normally, as the seat back 201 stands, A certain amount of space exists between the head of P and the back door 202. Therefore, in this case, the airbag cushion can be easily deployed and inflated.

  However, as shown in (b), during the rear-end collision, the load of the occupant P is applied to the seat back 201, and the upper end of the seat back 201 moves backward (tilts backward) due to elastic deformation or breakage. For example, when a seat belt that supports the shoulder is provided on the pillar, the occupant P is inclined rearward and upward as the seat belt 203 comes off the shoulder even if the seat belt 203 is used. To the side. For this reason, the head of the occupant P and the back door 202 are extremely close to each other, and it is difficult to deploy and inflate the airbag cushion between them.

  As described above, when the passenger's head and the back door are in close proximity, the airbag device cannot be deployed and inflated. The effect cannot be obtained sufficiently.

  In other words, when the seat back at the time of a rear collision moves backward, the occupant's head and the back door are closer than usual, so in the conventional structure that does not consider this point, the occupant's head and back door It is difficult to deploy and inflate the airbag cushion between the two, and it may become impossible to obtain an impact absorbing function or an occupant restraining function.

  In view of the above, the present invention provides a rear impact airbag device in a vehicle equipped with a back door, and the vehicle, in the vehicle, even when the seat back moves backward due to an impact at the time of rear impact. A rear impact airbag device in a vehicle having a back door capable of obtaining an impact absorbing function and an occupant restraining function of the rear impact airbag device by deploying and inflating an airbag cushion between the front portion and the back door The object is to provide a vehicle.

  A vehicle equipped with a back door and a rear impact airbag device according to the present invention includes a back door at the rear end of the vehicle, a rear seat having a seat back in front of the back door, and the back of the seat back. The vehicle is equipped with a rear impact airbag device capable of interposing an airbag cushion between the seat back and the back door at the time of rear impact, and the rear seat has a seat back. When receiving a rear impact load, it can move rearward under the load of an occupant, and restricts rearward movement of the seat back at the time of rear impact, so that the deployment inflation space of the airbag cushion of the airbag device can be reduced. And a back regulating member formed between the back door and the back door.

  According to the above configuration, when the seat back of the rear seat receives a rear collision load, the rear seat receives an occupant's load and tries to move backward, but the movement restricting member restricts the rear movement of the seat back at the time of the rear collision. Thus, a deployment / expansion space for the airbag cushion is formed between the seat back and the back door.

  For this reason, at the time of a rear collision, a deployment and inflation space for the airbag cushion can be reliably formed between the seat back and the back door.

  In one embodiment of the present invention, the movement restricting member is provided so as to project from the vehicle interior wall surface behind the seat back inward in the vehicle width direction and to contact the seat back during a rear collision.

  According to the above configuration, the movement restricting member that protrudes inward in the vehicle width direction from the vehicle interior wall surface comes into contact with the seat back at the time of a rear collision and restricts rearward movement of the seat back.

  Thus, the movement restricting member that restricts the rearward movement of the seat back can be simply configured by projecting the movement restricting member from the vehicle interior wall surface toward the inner side in the vehicle width direction. In particular, since there is no need to provide a movement restricting member on the rear seat side, the existing rear seat can be used as it is without making the rear seat complicated and heavy.

  In an embodiment of the present invention, the amount of protrusion of the movement restricting member on the inner side in the vehicle width direction is set to a length corresponding to the position of the seat back frame of the seat back.

  According to the above configuration, the protrusion length on the inner side in the vehicle width direction of the movement restricting member is set to a length corresponding to the position of the seat back frame of the seat back, so that the seat back moves backward in the case of a rear collision. In doing so, the movement restricting member interferes (contacts) with the seat back frame of the seat back.

  As a result, the rearward movement restriction of the seat back is surely performed, and the deployment and expansion space of the airbag cushion can be more reliably formed between the seat back and the back door.

  A rear impact airbag device in a vehicle having a back door according to the present invention includes a back door at a rear end of the vehicle, a rear seat having a seat back in front of the back door, and the back of the seat back. An airbag device for a rear impact in a vehicle disposed close to a door, wherein the rear seat can move rearward under the load of an occupant when a seat back receives a rear impact load, and a rear impact prediction Sometimes, the airbag apparatus has a first inflating means for interposing an airbag cushion between a seat back and a back door in advance, and a second inflating means for inflating the airbag cushion at the time of a rear collision. .

  According to the above configuration, when the seat back of the rear seat receives a rear impact load, the seat back attempts to move rearward under the load of the occupant. The second inflating means inflates the airbag cushion of the airbag apparatus at the time of a rear collision, by interposing in advance between the seat back and the back door.

  That is, at the time of a rear collision, the airbag cushion can be surely deployed and inflated between the seat back and the back door by the second inflating means.

  A rear impact airbag device in a vehicle having a back door according to the present invention includes a back door at a rear end of the vehicle, a rear seat having a seat back in front of the back door, and the back of the seat back. The rear seat is a vehicle arranged close to a door, and when the seat back receives a rear collision load, the rear seat receives a passenger's load and moves rearward, and immediately after the rear collision starts, the seat back and the back door And an airbag device that deploys and inflates the airbag cushion.

  According to the above configuration, when the seat back of the rear seat receives a rear collision load, the seat back attempts to move rearward under the load of the occupant. The airbag cushion is deployed and inflated between the two.

  For this reason, since the airbag cushion is deployed and inflated between the seat back and the back door faster than the rear movement of the seat back, a deployment and inflation space for the airbag cushion is formed between the seat back and the back door. can do.

  In one embodiment of the present invention, the vehicle includes a front collision airbag device that deploys and inflates an airbag cushion to an occupant during a front collision, and the rear collision airbag device is subjected to a collision load. When the impact value in the direction is greater than or equal to the first value, the airbag cushion starts to expand and inflate, and the front impact airbag device has an impact value in the direction in which the collision load acts is greater than or equal to the second value greater than the first value. The airbag cushion is started to expand and inflate.

  According to the above configuration, the rear impact airbag device starts to expand and inflate the airbag cushion when the impact value is equal to or higher than the first value, and the front impact airbag device has the second impact value greater than the first value. When the value is greater than or equal to the value, deployment and inflation of the airbag cushion is started.

  For this reason, the airbag cushion is deployed and inflated with a lower impact value in the case of the rear collision than in the case of the front collision. The cushion can be deployed and inflated.

  Therefore, in the case of a rear collision, the airbag cushion can be reliably deployed and inflated between the head of the occupant and the back door, and the impact absorbing function and the occupant restraining function of the rear collision airbag device can be obtained.

  According to the first aspect of the present invention, the movement restricting member restricts the rearward movement of the seat back at the time of a rear collision, and forms a deployment and inflation space of the airbag cushion between the seat back and the back door. Become. For this reason, at the time of a rear collision, a deployment and inflation space for the airbag cushion can be reliably formed between the seat back and the back door.

  Therefore, in a vehicle equipped with a back door and a rear impact airbag device, even when the seat back moves backward due to an impact at the time of a rear impact, it is ensured between the occupant's head and the back door. By deploying and inflating the airbag cushion, it is possible to obtain an impact absorbing function and an occupant restraining function of the rear impact airbag device.

  According to the fourth aspect of the present invention, the first inflating means interposes the airbag cushion between the seat back and the back door in advance, and the second inflating means is the airbag of the airbag device at the time of a rear collision. The cushion will expand.

  Therefore, in a rear collision airbag device in a vehicle equipped with a back door, even when the seat back moves backward due to an impact at the time of a rear collision, it is ensured between the occupant's head and the back door. By deploying and inflating the airbag cushion, it is possible to obtain an impact absorbing function and an occupant restraining function of the rear impact airbag device.

  According to the fifth aspect of the present invention, since the airbag cushion is deployed and inflated between the seat back and the back door faster than the rear movement of the seat back, the air bag is interposed between the seat back and the back door. The expansion | swelling expansion | swelling space of a bag cushion can be formed.

  Therefore, in a rear collision airbag device in a vehicle equipped with a back door, even when the seat back moves backward due to an impact at the time of a rear collision, it is ensured between the occupant's head and the back door. By deploying and inflating the airbag cushion, it is possible to obtain an impact absorbing function and an occupant restraining function of the rear impact airbag device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the first embodiment shown in FIGS. 1 to 3 will be described. FIG. 1 is a schematic side view of a rear part of a vehicle that employs a rear impact airbag device according to the present embodiment, FIG. 2 is a rear view of the rear part of the vehicle, and FIG. 3 is a rear view of the rear part of the vehicle excluding a back door.

  As shown in FIG. 1, the present embodiment is based on a vehicle V having a back door 1 at the rear end of the vehicle, and an airbag device 2 is installed on the back door 1. In front of the back door 1, a floor panel 3 constituting the floor surfaces of the compartment C and the cargo compartment T is extended to the front side of the vehicle, and a rear seat 5 is installed on the upper surface of the floor panel 3 via a slide rail 4. is doing.

  A rear side frame 6 extending in the vehicle front-rear direction is disposed below the floor panel 3, and a rear collision sensor 7 constituted by an acceleration sensor is installed at the rear end portion of the rear side frame 6.

  The rear seat 5 described above is fixed to the seat cushion 51 installed on the slide rail 4, the seat back 53 erected on the rear end of the seat cushion 51 via a hinge portion 52 with a reclining mechanism, and the upper end of the seat back 53. It consists of a headrest 54.

  Although not shown, the seat belt is a pillar type seat belt, and the seat belt winding position is set at an intermediate portion of the rear pillar.

  The rear seat 5 is installed so as to be slidable in the vehicle front-rear direction by the slide rail 4 described above, and the state shown in FIG. Note that the position of the seat back 53 indicated by a solid line is the normal time, and the position of the seat back 53 indicated by a one-dot chain line is the maximum reclining time.

  As can be seen from FIG. 1, in this vehicle V, the rear seat 5 is disposed rearward in order to secure the vehicle compartment C as much as possible, whereby the seat back 53 and the back door 1 are close to each other, and the rear portion When the seat back 53 is reclined with the seat 5 positioned at the rearmost part, the space between the seat back 53 and the back door 1 is almost eliminated.

  Here, “adjacent” means that the hinge portion 52 of the rear seat 5 is broken at the time of a rear collision and the upper portion (including the headrest 54) of the seat back 53 is assumed when the seat back 53 is in a substantially horizontal state. Refers to a positional relationship in which they are installed so as to interfere with the back door 1.

  The above-described airbag device 2 is installed on the periphery of the upper end portion of the back window 11 formed on the upper portion of the back door 1 (see FIG. 2), an airbag cushion 21 that expands and inflates at the time of a rear collision, and an airbag cushion. An inflator 22 that supplies high-pressure gas to the gas inlet 21 and a gas supply pipe 23 that connects the inflator 22 and the airbag cushion 21 are configured.

  The inflator 22 described above is disposed at the upper end portion of the back door 1 with the longitudinal direction directed in the vehicle width direction.

  The gas supply pipe 23 described above is also arranged below the inflator 22 at the upper end of the back door 1 so as to extend in the vehicle width direction so that the high-pressure gas from the inflator 22 is evenly supplied to the airbag cushion 21. Has been established.

  Further, the airbag cushion 21 described above is disposed so as to extend in the vehicle width direction at the upper end of the back door 1 in a state of being folded in a bellows shape in the up-down direction when not inflated (not shown). At the time of expansion and expansion, as shown in FIG. 2, the back window 11 is disposed so as to expand and expand from above so as to cover the back window 11 from the vehicle compartment side.

  In the present embodiment, the tensioner device 8 is provided to assist the deployment and inflation of the airbag cushion 21. That is, two cylinders 81, 81 are provided on the periphery of the both end portions in the vehicle width direction of the back window 11, and the longitudinal direction is directed vertically, and the two cylinders 81, 81 serve as the side of the airbag cushion 21. The lower end portion of the airbag cushion 21 is obtained by pulling the wire 82 connected to the end portion in the vertical direction via pulley portions 83 and 83 (pins and rods or the like) provided at both end portions of the back door 1. It is configured to apply a tension in the vehicle width direction to 21a.

  The tension generating structure of the tensioner device 8 is the same as that of the pretensioner device used in the seat belt device, and a detailed description thereof will be omitted.

1 and 2 show a state in which the airbag cushion 21 is expanded and inflated.
As shown in FIG. 1, the airbag cushion 21 is deployed and inflated downward along the side surface of the back window 11 on the passenger compartment side behind the seat back 53 of the rear seat 5.

  Further, as shown in FIG. 2, the airbag cushion 21 is deployed larger than the frame of the back window 11 when viewed from the rear of the vehicle, and is deployed in a substantially rectangular shape so as to completely cover the back window 11 from the passenger compartment side. Inflate.

  As described above, the airbag cushion 21 is deployed and inflated, so that even if the occupant moves backward, it can be prevented from coming into contact with the back window 11, and the airbag device 2 is provided with an impact absorbing function and an occupant restraint function. be able to.

  In particular, the cylinders 81, 81 of the tensioner device 8 are provided on both sides, and tension is applied to both side ends of the airbag cushion 21, so that the airbag cushion 21 is attached to the peripheral edges of both side ends of the back window 11 of the back door 1. Since the airbag cushion 21 is inflated and inflated while being fixedly supported on the airbag cushion 21, an occupant restraint function can be provided to the airbag cushion 21 with certainty.

  The airbag cushion 21 is provided with reinforcing portions 21b and 21b extending in the vertical direction at the side end portions so that the airbag cushion 21 is not damaged even when pulled by the wires 82 and 82 of the tensioner device 8. The reinforcing portions 21b and 21b also have a function of maintaining a deployed shape of the airbag cushion 21 that is deployed in a substantially square shape, and a function in which the side end portion of the airbag cushion 21 is positioned along the side end portion of the back window 11. Plays.

  The airbag cushion 21 is provided with a plurality of stitching lines 21c extending vertically between the headrests 54 so as to avoid the headrests 54 of the rear seat 5. The stitching lines 21c are set so as to extend from an intermediate portion to a lower end portion of the airbag cushion 21, respectively.

  Thus, since the high-pressure gas surely flows downward and does not flow to the side (vehicle width direction) by setting the stitching line 21c, the airbag cushion 21 can be surely expanded and inflated downward. it can.

  Further, by setting the stitching lines 21c between the headrests 54 and increasing the thickness of the cushion portions 21d corresponding to the headrests 54, the high-pressure gas is transferred to the passenger's head (not shown). ) Is actively supplied to a portion close to the back window 11, so that a so-called bottoming phenomenon caused by the head of the occupant entering the airbag cushion 21 can be prevented, and the airbag device 2 can be prevented. Can improve the shock absorbing function.

  However, such deployment and inflation of the airbag cushion 21 cannot be performed unless the deployment and inflation space of the airbag cushion 21 exists between the seat back 53 and the back door 1 when the airbag device 2 is operated. .

  Therefore, in order to form this expansion / expansion space, in this embodiment, as shown in FIGS. 1 and 3, a movement restricting member 9 that restricts the backward movement of the seat back 53 is set.

  Specifically, as shown in FIG. 3, the movement restricting member 9 is a shelf that protrudes from the trim surface constituting the vehicle interior side wall 10 behind the seat back 53 toward the vehicle interior side (vehicle width direction center side). It consists of members 91 and 92.

  A flat shelf member 91 is provided on the left side of the passenger compartment side wall 10 and a box-like shelf member 92 having a storage space inside is provided on the right side so that rearward movement at the time of a rear collision of the seat back 53 is restricted. It is composed.

  As shown in FIG. 1, the installation positions of the shelf members 91 and 92 in the vehicle front-rear direction are such that the rear seat 5 is slid to the rearmost end and the seat back 53 is reclined to the maximum (the state indicated by the one-dot chain line). The rear position close to the seat back 53 is set.

  By setting the installation position of each shelf member 91, 92 to this close position, it becomes possible to restrict the rearward movement of the seat back 53 beyond this position, and the seat back 53 loads the occupant's load at the time of a rear collision. Even in the case of receiving and moving backward, the backward movement of the seat back 53 can be restricted, and the deployment and inflation space of the airbag cushion 21 can be secured behind the seat back 53.

  As shown in FIG. 3, the protruding length (the protruding amount) of each shelf member 91, 92 in the vehicle width direction is set to a length corresponding to the position of the seat back frame 53a inside the seat back 53. When the seat back 53 moves backward at the time of a collision, the seat back frame 53a is configured to interfere (contact) with the shelf members 91 and 92.

  For this reason, each shelf member 91 and 92 can latch the seat back frame 53a reliably, and can suppress the back movement of the seat back 53. FIG.

  In addition, although the shelf members 91 and 92 of the present embodiment are set to the left and right respectively, the shelf members may be provided only on either one side, or the shelf members are provided by members that connect the left and right. Also good.

Next, the operation and effect of the present embodiment configured as described above will be described in detail.
The vehicle V including the back door 1 and the rear impact airbag device 2 according to this embodiment includes the back door 1 at the rear end of the vehicle, and the rear seat 5 including the seat back 53 in front of the back door 1. The rear impact airbag device 2 is installed, and the seat back 53 is disposed close to the back door 1 and the airbag cushion 21 can be interposed between the seat back 53 and the back door 1 at the time of rear impact. In the vehicle V, when the seat back 53 receives a rear collision load, the rear seat 5 can move rearward under the load of the occupant, and restricts rearward movement of the seat back 53 during the rear collision. Thus, the airbag apparatus 2 has a movement restricting member 9 that forms a deployment and expansion space of the airbag cushion 21 between the seat back 53 and the back door 1.

  According to the above configuration, when the seat back 53 of the rear seat 5 receives a rear collision load, the seat back 53 tries to move rearward under the load of the occupant. The rearward movement is restricted, and the expansion / inflation space of the airbag cushion 21 is formed between the seat back 53 and the back door 1.

  For this reason, at the time of a rear collision, the deployment and inflation space of the airbag cushion 21 can be reliably formed between the seat back 53 and the back door 1.

  Therefore, in the rear collision airbag device 2 in the vehicle V provided with the back door 1, even when the seat back 53 moves backward due to an impact at the time of the rear collision, it is ensured that the passenger's head and back By deploying and inflating the airbag cushion 21 between the doors 1, the impact absorbing function and the passenger restraining function of the rear impact airbag device 2 can be obtained.

  Further, in this embodiment, the movement restricting member 9 is protruded from the vehicle interior side wall 10 behind the seat back 53 to the inner side in the vehicle width direction, and the shelf members 91 and 92 that come into contact with the seat back 53 at the time of a rear collision. It is composed.

  According to the above configuration, the shelf members 91 and 92 projecting inward in the vehicle width direction from the passenger compartment side wall 10 come into contact with the seat back 53 at the time of a rear collision and restrict the rearward movement of the seat back 53. Become.

  In this manner, the movement restricting member 9 that restricts the rearward movement of the seat back 53 is simply configured by forming the shelf members 91 and 92 so as to protrude inward in the vehicle width direction from the compartment side wall 10. be able to. In particular, since it is not necessary to provide the movement restricting member 9 on the rear seat 5 side, the existing rear seat 5 can be used as it is without configuring the rear seat 5 to be complicated and heavy.

  In the present embodiment, the movement restricting member 9 is composed of the shelf members 91 and 92. However, if the rearward movement at the time of the rear impact of the seat back 53 is restricted, for example, a hook-shaped member is used as the seat back. 53 and the side wall 10 of the passenger compartment, and the seat back 53 may be locked by a hook member when the seat back 53 is moved rearward. The rearward movement of the seat back 53 may be regulated by the side wall of the passenger compartment itself by being raised in a tapered shape toward the passenger compartment. Furthermore, a protruding member that protrudes upward from the floor panel 3 and protrudes rearward of the seat back 53 may be provided.

  In this embodiment, the amount of protrusion of the shelf members 91, 92 on the inner side in the vehicle width direction is set to a length corresponding to the position of the seat back frame 53a of the seat back 53.

  According to the above configuration, the protruding length of the shelf members 91 and 92 on the inner side in the vehicle width direction is set to the length corresponding to the position of the seat back frame 53a of the seat back 53, so that the seat When the back 53 moves rearward, the shelf members 91 and 92 interfere (contact) with the seat back frame 53 a of the seat back 53.

  As a result, the rearward movement restriction of the seat back 53 is reliably performed, and the deployment and inflation space of the airbag cushion 21 can be more reliably formed between the seat back 53 and the back door 1.

  Next, a second embodiment shown in FIGS. 4 to 8 will be described. 4 is a schematic side view of the rear part of the vehicle employing the rear impact airbag device 2 of the present embodiment, FIG. 5 is a rear view of the rear part of the vehicle, FIG. 6 is a system block diagram of the present embodiment, and FIG. FIG. 8 is a timing chart of this embodiment. In addition, about the component similar to 1st embodiment, the code | symbol similar to 1st embodiment is attached | subjected and description is abbreviate | omitted.

  In the second embodiment, the rear collision is predicted before the rear collision actually starts, and when the rear collision is predicted, the rearward of the seat back 53 is secured in order to secure a deployment / expansion space of the airbag cushion 21 in advance. The airbag cushion 21 is interposed between the two.

  That is, the airbag cushion 21 is not deployed and inflated at the time of the rear impact as in the normal rear impact airbag device 2, but the airbag cushion 21 is deployed and inflated before the rear impact in advance. Sometimes, the problem that the seat back 53 moves backward and the airbag cushion 21 does not enter between the seat back 53 and the back door 1 is solved.

  As shown in FIGS. 4 and 5, the airbag apparatus 2 of the present embodiment is also installed at the upper end of the back door 1, and an airbag cushion 21 that expands and inflates so as to cover the back window 11 at the time of a rear collision, An inflator 22 that supplies high-pressure gas to the bag cushion 21 and a gas supply pipe 23 that connects the inflator 22 and the airbag cushion 21 are configured.

  However, the airbag device 2 of the present embodiment has two inflators 22 set. There are two types: a first inflator 22a that expands and inflates the airbag cushion 21 in advance at the time of rear collision prediction, and a second inflator 22b that fully expands and inflates the airbag cushion 21 at the time of rear collision.

  Thus, by setting two inflators 22a and 22b, the airbag cushion 21 can be deployed in advance with respect to the rearward movement of the seat back 53 by the control described later.

  Further, in this embodiment, in order to reduce the number of cylinders of the tensioner device 8, a single cylinder 84 is installed on the periphery of the lower end portion of the back window 11 of the back door 1 with the longitudinal direction facing the vehicle width direction. Yes.

  In this cylinder 84, the two wires 82, 82 connected to both end portions of the airbag cushion 21 are pulled in the horizontal direction via the pulley portions 83, so that the vehicle is moved to the lower end portion 21 a of the airbag cushion 21. It is configured to give a tension in the width direction.

  Even in such a configuration, the tension in the vehicle width direction can be applied to the lower end portion 21a of the airbag cushion 21, so that the airbag cushion 21 can be deployed and inflated.

  Furthermore, in this embodiment, as shown in FIG. 4, a laser radar 71 that detects an object behind the vehicle (such as a rear vehicle) is installed in the rear bumper 61. By providing this laser radar 71, it is possible to perform a rear-end collision prediction.

  Other components are the same as those in the first embodiment.

  As shown in FIG. 6, the system block of the second embodiment includes a vehicle speed sensor 101, a rear-end collision sensor 7, and a laser radar 71 (inter-vehicle distance sensor) as input means in an airbag control unit 100 that is a central processing unit. The first inflator 22a, the second inflator 22b, and the tensioner device (cylinder) 8 which are output means are connected to each other.

  The airbag control unit 100 includes a relative speed calculation unit 100a that calculates and calculates a relative speed between the host vehicle and the rear vehicle V, and a rear collision prediction unit 100b that predicts whether or not a rear collision occurs. And an expansion / inflation determination unit 100c for determining whether to actually deploy the airbag cushion 21 from these data.

  On the premise of this system block, control is performed according to the control flow shown in FIG.

  First, in S1, data is taken from each sensor. The current speed of the host vehicle is detected from the vehicle speed sensor 101, the presence / absence of a rear collision from the rear collision sensor 7, the presence / absence of a rear vehicle and the current inter-vehicle distance from the laser radar 71 as current data.

  Next, in S2, it is determined whether there has been a collision prediction determination by the previous time. If there is a rear-end collision prediction determination by the previous time (in the case of Y), steps S3 to S8 described later are omitted, and the process proceeds to S9. When there is no rear collision prediction determination (in the case of N), the process proceeds to S3.

  In S3, the inter-vehicle distance is differentiated to calculate the relative speed between the host vehicle and the rear vehicle, and the current relative speed is taken in as data.

  Next, in S4, it is determined whether the inter-vehicle distance is equal to or less than a predetermined value. For example, it is determined that the predetermined value is 10 m, and if the inter-vehicle distance is 10 m or less (in the case of Y), the process proceeds to S5, and if not 10 m or less (in the case of N), the process proceeds to return. It is possible.

  In such a configuration, since the inter-vehicle distance is 10 m or more, it is determined that the possibility of a rear collision is low, and thereafter, unnecessary control can be prevented.

  Next, in S5, it is determined whether the vehicle speed is a predetermined value or more. For example, it is determined that the predetermined value is zero, and when the vehicle speed is zero or more (in the case of Y), the process proceeds to S6, and when it is not zero or more (in the case of N), the process proceeds to return. Can be considered.

  In such a configuration, the airbag cushion 21 is not expanded and inflated by the rear-end collision prediction determination when the host vehicle is moving backward. It is possible to prevent deterioration of the rear view at the time.

  Further, in S6, it is determined whether the relative speed is a predetermined value or more. For example, it is determined that the predetermined value is 30 km / h, and if the relative speed is 30 km / h or more (in the case of Y), the process proceeds to S7, and if it is not 30 km / h or more (in the case of N), the process returns. It can be considered to be configured to migrate.

  When configured in this way, it is possible to prevent malfunction of the first inflator 22a when there is little difference in relative speed with low possibility of rear collision.

  In this way, if all conditions are satisfied after the determination of S4 to S6, it is determined in S7 that the rear-end collision is predicted. That is, when the conditions of S4 to S6 are provided, the possibility of a rear collision is extremely high, and therefore it is determined that the rear collision is predicted in S7.

  In step S8, the first inflator 22a is operated to deploy and inflate the airbag cushion 21. The expansion and expansion in this case does not require the airbag cushion 21 to be completely expanded and inflated, and is merely for ensuring a deployment and expansion space between the seat back 53 and the back door 1. Is expanded and expanded in a thin state.

  In S8, the cylinder 84 of the tensioner device 8 is also operated, so that the airbag cushion 21 can be reliably deployed between the seat back 53 and the back door 1.

  Next, in S9, it is determined whether the impact value of the rear impact is a predetermined value or more. When it is determined that the value is equal to or greater than the predetermined value (in the case of Y), the process proceeds to S10 and the second inflator 22b is operated. On the other hand, if it is not determined that the value is equal to or greater than the predetermined value (N), the process proceeds to return.

  As described above, when it is determined that the impact is large due to the rear impact, the second inflator 22b is operated to further supply the high-pressure air to the deployed airbag cushion 21 so that the airbag cushion 21 is all inflated. Therefore, an occupant restraint function and an impact absorbing function can be reliably obtained when a rear collision actually occurs.

  Control of the rear impact airbag device 2 of this embodiment according to this control flow will be further described with reference to the timing chart of FIG.

  First, when the predetermined conditions of S4 to S6 described above are provided, when the collision prediction determination is performed at the timing (a), the first inflator 22a is operated at the timing (a) almost at the same time. The tensioner device 8 is activated.

  By operating the first inflator 22a and the tensioner device 8 at the timing (i), the airbag cushion 21 can be securely placed between the seat back 53 and the back door 1 when the seat back 53 does not move backward. Can be deployed.

  Thereafter, the rear collision starts at the timing (c), and the second inflator 22b is operated at the timing (d).

  The operation of the second inflator 22b at the timing of (d) coincides with the operation timing of the conventional airbag device, and the operation of the second inflator 22b causes the passenger cushion to be restrained on the airbag cushion 21 deployed in advance. Functions and shock absorbing functions can be provided.

  As described above, by operating the first inflator 22a and the tensioner device 8, the airbag cushion 21 can be deployed in front of the seat back 53 in advance before the rear impact. Therefore, even if the seat back 53 moves rearward at the time of a rear collision, the airbag cushion 21 can be reliably deployed and inflated between the seat back 53 and the back door 1.

  In the second embodiment described above, the first inflator 22a and the tensioner device 8 are operated at the same time when the rear collision is predicted. However, only the tensioner device 8 is operated when the rear collision is predicted. Thus, the airbag cushion 21 may be deployed downward.

  In this case, since the airbag cushion 21 is deployed downward without being inflated, the airbag cushion 21 can be deployed between the seat back 53 and the back door 1 more reliably.

  In the first embodiment and the second embodiment described above, the airbag device 2 is provided inside the bag door. However, the airbag device 2 may be provided, for example, on the rear header or the rear pillar on the vehicle body side.

  In this case, since the weight of the airbag device 2 or the like is not applied to the back door 1, the back door 1 can be easily opened and closed, and the burden on an assist damper (not shown) for assisting opening and closing is reduced. can do.

Next, the operation and effect of the present embodiment configured as described above will be described in detail.
The rear impact airbag device 2 in the vehicle V including the back door 1 according to this embodiment includes the back door 1 at the rear end portion of the vehicle and the rear seat 5 including the seat back 53 in front of the back door 1. The rear impact airbag device 2 is installed in a vehicle V in which the seat back 53 is disposed close to the back door 1, and the rear seat 5 is configured so that when the seat back 53 receives a rear impact load, The first inflator 22a that can move backward in response to a load and that interposes the airbag cushion 21 of the airbag device 2 in advance between the seat back 53 and the back door 1 at the time of a rear collision prediction, And a second inflator 22b for inflating the airbag cushion.

  According to the above configuration, when the seat back 53 of the rear seat 5 receives a rear impact load, the seat back 53 tries to move rearward under the load of the occupant. The cushion 21 is interposed between the seat back 53 and the back door 1 in advance, and the second inflator 22b inflates the airbag cushion 21 of the airbag device 2 at the time of a rear collision.

  That is, at the time of a rear collision, the airbag cushion 21 can be reliably deployed and inflated between the seat back 53 and the back door 1 by the second inflator 22b.

  Therefore, in the rear collision airbag device 2 in the vehicle V provided with the back door 1, even when the seat back 53 moves backward due to an impact at the time of the rear collision, it is ensured that the passenger's head and back By deploying and inflating the airbag cushion 21 between the doors 1, the impact absorbing function and the passenger restraining function of the rear impact airbag device 2 can be obtained.

  In the present embodiment, the airbag cushion 21 is configured to be deployed and inflated by two separate inflators 22a and 22b. However, the inflator may be configured of a single inflator and generate high-pressure gas in two stages. The airbag cushion 21 may be deployed and inflated.

  Further, the airbag cushion itself may be composed of two, and may be configured to be deployed and inflated separately at the time of the rear impact prediction and the rear impact.

  Next, a third embodiment shown in FIGS. 9 and 10 will be described. FIG. 4 is a system block diagram of the present embodiment, and FIG. 10 is a timing chart of the present embodiment. In addition, about the structure of the specific airbag apparatus 2 for rear collisions, it is the same as that of 1st embodiment or 2nd embodiment, and the airbag apparatus provided in the steering wheel or the inner panel is operated by front collision. The structure of the front-impact airbag device and the side-impact airbag device that activates the airbag device provided on the door side of the seat or the side rail of the roof by side collision is the same as the conventional structure. The explanation is omitted.

  The present embodiment is based on the premise that the front-impact airbag device, the side-impact airbag device, and further the rear-impact airbag device 2 are provided. While eliminating the problem of the seat back 53 moving backward at the time of a rear collision, the shock absorbing function at the time of a front collision and a side collision is ensured.

  As shown in FIG. 9, the system block of the present embodiment includes a rear collision sensor 6 that is an input means, a front collision sensor 6A, The side impact sensor 6B is connected, and the rear impact inflator 22, the front impact inflator 22A, the side impact inflator 22B, and the rear impact tensioner device 8 which are output means are connected. In addition, the airbag control unit 110 includes a deployment / inflation determination unit 110a that determines at what timing the airbag cushion is deployed and inflated.

The operation timing of the thus configured airbag device is shown in FIG.
First, when the rear impact occurs at the timing of (f), and then the degree of impact (acceleration or speed) in the direction in which the impact is applied becomes equal to or greater than the first value, the rear impact inflator 22 operates at the timing of T1. To do. The timing of T1 is the timing immediately after the start of the rear collision, and is set so that the airbag cushion 21 is deployed and inflated with almost no time lag.

  As described above, the airbag cushion 21 is set between the seat back 53 and the back door 1 before the seat back 53 of the rear seat 5 moves backward by setting the airbag cushion 21 to be inflated and inflated instantaneously. Can be expanded and inflated.

  Therefore, the problem in the case where the seat back 53 moves backward due to the rear impact can be solved.

  In addition, when the front impact occurs at the timing (S), and then the impact degree (acceleration or speed) in the direction in which the impact is applied becomes equal to or greater than the second value, the front impact inflator 22A operates at the timing T2. To do. The timing of T2 is that the airbag cushion (not shown) is deployed so that the head of the occupant moves forward due to an impact and does not come into contact with a predetermined object (for example, a steering wheel) after the start of the front collision. It is set to expand.

  Thereby, the impact absorption function of the airbag cushion at the time of a front collision can be improved.

  At this time, by setting first value <second value for the first value and the second value for determining the operation of the airbag cushion between the front collision and the rear collision, respectively, the seat at the time of the rear collision While eliminating the problem in the case where the back 53 moves backward, it is possible to ensure the shock absorbing function at the time of the front collision.

  Further, when the side impact occurs at the timing of (T), and the impact degree (acceleration or speed) in the direction in which the impact is applied becomes equal to or higher than the third value, the side impact inflator 22B operates at the timing of T3. To do. The third value is set to be smaller than the second value although it is larger than the first value. After a side collision, the head of the occupant moves to the side due to an impact, and a predetermined object (for example, side It is set not to come into contact with the pillar.

  Also in this case, the impact absorbing function of the airbag cushion at the time of a side collision can be enhanced.

  As described above, the impact value that determines the start of operation of the airbag device between the front collision, the rear collision, and the side collision is set to the first value <the third value <the second value. The time until the operation timing of the inflator is Δt1 <Δt3 <Δt2.

Next, the operation and effect of the present embodiment configured as described above will be described in detail.
The rear impact airbag device 2 in the vehicle V including the back door 1 according to this embodiment includes the back door 1 at the rear end portion of the vehicle and the rear seat 5 including the seat back 53 in front of the back door 1. The vehicle V is installed and the seat back 53 is arranged close to the back door 1, and the rear seat 5 moves rearward under the load of the occupant when the seat back 53 receives a rear impact load. In addition, the airbag apparatus 2 that deploys and inflates the airbag cushion 21 between the seat back 53 and the back door 1 immediately after the start of the rear collision is provided.

  According to the above configuration, when the seat back 53 of the rear seat 5 receives a rear impact load, the seat back 53 tries to move rearward under the load of the occupant. The airbag cushion 21 is deployed and inflated between the rear door 53 and the back door 1.

  For this reason, since the airbag cushion 21 is deployed and inflated between the seat back 53 and the back door 1 faster than the rear movement of the seat back 53, the airbag cushion is interposed between the seat back 53 and the back door 1. 21 can be intervened.

  Therefore, in the rear collision airbag device 2 in the vehicle V provided with the back door 1, even when the seat back 53 moves backward due to an impact at the time of the rear collision, it is ensured that the passenger's head and back By deploying and inflating the airbag cushion 21 between the doors 1, the impact absorbing function and the passenger restraining function of the rear impact airbag device 2 can be obtained.

  In this embodiment, the vehicle V includes a front collision airbag device (not shown), and the rear collision airbag device 2 has an impact value in a direction in which a collision load acts on a first value or more. The airbag airbag 21 is started to inflate and inflate, and the airbag device for front impact has an airbag cushion (not shown) having an impact value in a direction in which a collision load acts is a second value greater than the first value. This starts the expansion and expansion.

  According to the above configuration, the rear impact airbag device 2 starts to expand and inflate the airbag cushion 21 when the impact value is equal to or higher than the first value, and the front impact airbag device has an impact value greater than the first value. The airbag cushion starts to be expanded and inflated when the value is greater than or equal to the second value.

  For this reason, in the case of the rear collision, the airbag cushion 21 is deployed and inflated with a lower impact value than in the case of the front collision. Can be expanded and inflated.

  Therefore, in the case of a rear collision, the airbag cushion 21 is reliably deployed and inflated between the occupant's head and the back door 1 to obtain the impact absorbing function and the occupant restraining function of the rear collision airbag device 21. it can.

  In the present embodiment, the impact value for determining the start of operation of the airbag device between the front collision, the rear collision, and the side collision is set as first value <third value <second value. The impact value at the time of the front collision may be reduced so that the first value <the third value = the second value. Moreover, the airbag apparatus for side collisions and the airbag apparatus for rear collisions may be provided, without providing the airbag apparatus for side collisions.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The first expansion means of the present invention corresponds to the first inflator 22a of the embodiment,
Similarly,
The second expansion means corresponds to the second inflator 22b,
The present invention is not limited to the configuration of the above-described embodiment, but includes embodiments applied to various rear-impact airbag devices.

The side surface schematic of the vehicle rear part of 1st embodiment. The rear view of the vehicle rear part of 1st embodiment. The rear view of the vehicle rear part except the back door of a first embodiment. The side surface schematic of the vehicle rear part of 2nd embodiment. The rear view of the vehicle rear part of 2nd embodiment. The system block diagram of 2nd embodiment. The control flowchart of 2nd embodiment. The timing chart of 2nd embodiment. The system block diagram of 3rd embodiment. The timing chart of 3rd embodiment. (A) Vehicle rear side view showing seating state of occupant at normal time, (b) Vehicle rear side view showing occupant moving state at rear impact.

Explanation of symbols

V ... Vehicle 1 ... Back door 11 ... Back window 2 ... Air bag device 21 ... Air bag cushion 22a ... First inflator (first inflating means)
22b ... second inflator (second expansion means)
5 ... Rear seat 53 ... Seat back 9 ... Movement restricting member

Claims (6)

A back door is provided at the rear end of the vehicle, a rear seat provided with a seat back is installed in front of the back door, the seat back is disposed close to the back door, and the seat back and the back door are A vehicle equipped with a rear-impact airbag device capable of interposing an airbag cushion therebetween,
The rear seat can move rearward under the load of the occupant when the seat back receives a rear impact load,
Back door and rear collision air having a movement regulating member that regulates rearward movement of the seat back at the time of rear collision and forms a deployment and inflation space of an airbag cushion of the airbag device between the seat back and the back door A vehicle equipped with a bag device. 2. The back door and the rear impact airbag according to claim 1, wherein the movement restricting member is provided so as to project inward in the vehicle width direction from the vehicle interior wall surface behind the seat back so as to contact the seat back at the time of rear impact. A vehicle equipped with a device. The back door and the rear collision airbag device according to claim 2, wherein a protrusion amount on the inner side in the vehicle width direction of the movement restricting member is set to a length corresponding to a position of a seat back frame of the seat back. vehicle. A rear impact airbag device in a vehicle including a back door at a rear end of the vehicle, a rear seat provided with a seat back in front of the back door, and the seat back disposed close to the back door,
The rear seat can move rearward under the load of the occupant when the seat back receives a rear impact load,
A first inflating means for interposing an airbag cushion of an airbag device in advance between a seat back and a back door at the time of a rear-end collision prediction;
A rear-impact airbag device in a vehicle comprising a back door having second inflating means for inflating the airbag cushion at the time of a rear impact. A vehicle provided with a back door at the rear end of the vehicle, a rear seat provided with a seat back in front of the back door, and the seat back disposed close to the back door,
When the seat back receives a rear impact load, the rear seat receives a passenger's load and moves rearward.
A rear collision airbag apparatus in a vehicle including a back door having an airbag apparatus that deploys and inflates an airbag cushion between a seat back and a back door immediately after the start of the rear collision. The vehicle includes a front impact airbag device that deploys and inflates an airbag cushion to an occupant during a front impact,
The rear impact airbag device has an impact value in a direction in which a collision load acts with a first value or more to start deployment and inflation of the airbag cushion,
6. The back door according to claim 5, wherein the front-impact airbag device starts deployment and inflation of the airbag cushion when an impact value in a direction in which a collision load acts is a second value greater than a first value. A rear-impact airbag device in a vehicle comprising:

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