JP2006088714A - Vehicle provided with rear door and air bag device for rear-end collision - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle provided with a rear door and a rear-end collision air bag device capable of obtaining an impact absorbing function and a passenger retaining function by retaining a passenger and developing and inflating an air bag cushion between passenger's head and the rear door even in a case that a seat rear is moved rearward due to an impact caused in a rear-end collision. <P>SOLUTION: In order to retain the lower body of the passenger P in the rear-end collision, a buckle member 64 is composed of a buckle body 64a, a connecting member 64b, and a pretensioner unit 64c (a buckle pretensioner unit). Thus, since tension is directly applied to a belt member 62c retaining the lower body by providing the pretensioner unit 64c to the buckle member 64, the lower body of the passenger P can be retained securely. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  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.

  In addition, this Patent Document 1 is provided with a seat belt retracting device (pretensioner device) that automatically retracts the seat belt of the rear seat, and operates the seat belt retracting device at the time of a rear collision, so that the restraint of the passenger is more appropriate. Is disclosed.

  According to this 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 by the airbag device, and further the occupant restraining function can be obtained by the seat belt retracting device. ing.

  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.

JP 2004-58849 A JP 2004-58850 A

  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 head of the occupant and the back door are very close to each other, the airbag device cannot be deployed and inflated. The effect cannot be obtained sufficiently.

  Further, as described in Patent Document 1, even if the seat belt is wound by the seat belt winding device, the seat back moves backward due to the impact at the time of the rear collision, and the upper body of the occupant also tilts backward, There is a problem that the occupant cannot be sufficiently restrained and the occupant's head and the back door are very close to each other, and the airbag cushion cannot be deployed and inflated between them.

  In view of this, the present invention provides a vehicle equipped with a back door and a rear-impact airbag device. Provided with a back door and a rear impact air bag device that can deploy and inflate an air bag cushion between the head of the occupant and the back door to obtain an impact absorbing function and an occupant restraint function of the rear impact air bag device. The purpose is to provide a vehicle.

  A vehicle having a back door and a rear impact airbag device according to the present invention has a rear seat provided with a seat back in front of the back door at the rear end of the vehicle, and the seat back is disposed in proximity to the back door. And 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, wherein the rear seat has the seat back When it receives a load, it can move backward under the load of the occupant, and is installed in the rear seat, extending at least a part between the occupant's waist and the crotch part in the vehicle width direction to the seat cushion side. A belt member for lower body to be pressed, and tension applying means for applying tension to the belt member for lower body and pressing the occupant toward the seat cushion at the time of rear collision.

  According to the above configuration, the seat back of the rear seat, when subjected to a rear impact load, moves backward under the load of the occupant, but presses a portion between the occupant's waist and the crotch to the seat cushion side. The tension applying means applies tension to the lower body belt member to be pressed, thereby pressing the lower body of the occupant toward the seat cushion.

  For this reason, at the time of a rear collision, the occupant is restrained by the seat cushion by the lower body belt member, and the rearward movement of the occupant is suppressed.

  In one embodiment of the present invention, the tension applying means is a tensioner device installed on a connecting member for fixing a buckle of the lower body belt member to a vehicle body side member.

  According to the said structure, tension | tensile_strength is provided to the belt member for lower body at the time of a rear collision by the tensioner apparatus installed in the connection member which fixes the buckle of the belt member for lower body to the vehicle body side member.

  For this reason, a tension | tensile_strength can be directly provided to a lower body belt member, and the passenger | crew's rearward movement at the time of a rear collision can be suppressed reliably.

  In one embodiment of the present invention, the tension applying means is a tensioner device installed in an anchor portion that fixes one end of the lower body belt member to a vehicle body side member.

  According to the above configuration, the tension is applied to the lower body belt member at the time of a rear collision by the tensioner device installed in the anchor portion that fixes one end portion of the lower body belt member to the vehicle body side member.

  For this reason, a tension | tensile_strength can be directly provided to a lower body belt member, and the passenger | crew's rearward movement at the time of a rear collision can be suppressed reliably.

  In one embodiment of the present invention, an upper body belt member that restrains the upper body of an occupant that is connected to the lower body belt member is supported by an intermediate portion of the pillar.

  According to the said structure, the upper body belt member which restrains a passenger | crew's upper body is supported by a pillar intermediate part.

  For this reason, since it is not necessary to install a retractor device for the belt member on the seat back, the weight of the seat back can be reduced, and the shoulder can be moved against the backward movement of the seat back due to the impact at the time of the rear impact. Even if it cannot be supported, the occupant is restrained by the seat cushion by the lower body belt member, so that the effect of restraining the occupant can be obtained more effectively.

  A vehicle having a back door and a rear impact airbag device according to the present invention has a rear seat provided with a seat back in front of the back door at the rear end of the vehicle, and the seat back is disposed in proximity to the back door. And 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, wherein the rear seat has the seat back When receiving a load, the seat belt support portion that can move rearward under the load of the occupant and that is installed at the upper end of the seat back of the rear seat and supports the belt member for the upper body that locks the shoulder of the occupant It is what has.

  According to the above configuration, the seat back of the rear seat receives the occupant's load and moves rearward when receiving a rear impact load. By supporting the upper body belt member that locks the upper body belt member, the upper body belt member moves rearward together with the seat back.

  For this reason, the rearward movement of the occupant is suppressed because the belt member for the upper body does not come off from the occupant's shoulder at the time of a rear collision.

  In one embodiment of the present invention, there is provided tension applying means for applying tension to the upper body belt member and pressing an occupant to the seat back side at the time of rear collision.

  According to the above configuration, at the time of a rear collision, the tension is applied to the belt member for the upper body by the tension applying means, and the occupant is pressed toward the seat back side.

  For this reason, at the time of a rear collision, the occupant is restrained by the seat bag by the upper body belt member, and the rearward movement of the occupant is reliably suppressed.

  In one embodiment of the present invention, the rear seat is provided with weight detection means for detecting the weight of an occupant, and the operation of the tension applying means is prohibited when the weight detected by the weight detection means is less than a predetermined value. Control means.

  According to the above configuration, the weight detecting means detects the weight of the occupant in the rear seat, and when the weight is not more than a predetermined value, the control means prohibits the operation of the tension applying means.

  For this reason, when a lightweight occupant (for example, a child) is seated on the rear seat, the belt member is not restrained by the tension applying means even at the time of a rear collision. Excessive restraint can be avoided.

  That is, in the case of a lightweight occupant, the load at the time of rear-end collision is difficult to be applied to the seat back, so the rear movement of the seat back is small and the rear movement of the occupant is also small. In this situation, if the tension of the belt member is excessively increased by the tension applying means, an impact is given to the occupant. Therefore, the occupant is protected by not operating the tension applying means. .

  In one embodiment of the present invention, the rear seat is provided with a reclining mechanism for changing the inclination angle of the seat back to the reclining state.

  According to the above configuration, the inclination angle of the seat back of the rear seat can be changed to the reclining state by the reclining mechanism.

  For this reason, it is possible to provide a rear seat that meets the use needs of the occupant, and even when the seat back is in a reclining state, the occupant can be restrained at the time of a rear collision, so that the occupant can be prevented from moving backward. .

  In one embodiment of the present invention, the rear seat is provided with a reclining mechanism for changing the inclination angle of the seat back to a reclining state, and the seat is detected even when the weight detected by the weight detecting means is equal to or less than a predetermined value. And a control means for operating the tension applying means when the inclination angle of the back is in the reclining state.

  According to the above configuration, even when the weight detected by the weight detecting means is equal to or less than the predetermined value, the tension applying means is actuated when the inclination angle of the seat back is set to the reclining state. become.

  For this reason, when the seat back is in the reclining state, even if a lightweight occupant is seated, the belt member is restrained by the tension applying means, and the occupant can be restrained reliably. it can.

  That is, even if the occupant is a lightweight occupant such as a child, the seat back has already moved backward (inclined) in the reclining state, so that the occupant moves backward regardless of weight. become. In this case, by restraining the occupant with the tension applying means, the rearward movement of the occupant can be reliably suppressed.

  According to the first aspect of the present invention, at the time of a rear collision, the occupant is restrained by the seat cushion by the lower body belt member, and the rearward movement of the occupant is suppressed.

  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, the occupant is restrained and the occupant's head is surely secured. The airbag cushion can be deployed and inflated between the rear door and the rear door to obtain the impact absorbing function and the passenger restraining function of the rear impact airbag device.

  According to the fifth aspect of the present invention, the rearward movement of the occupant is suppressed because the upper body belt member does not come off from the shoulder of the occupant at the time of a rear collision.

  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, the occupant is restrained and the occupant's head is surely secured. The airbag cushion can be deployed and inflated between the rear door and the rear door to obtain the impact absorbing function and the passenger 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 5 will be described. FIG. 1 is a schematic side view of a rear part of a vehicle that employs the rear impact airbag device of the present embodiment, FIG. 2 is a rear view of the rear part of the vehicle, FIG. 3 is a side view including a seat belt device, and FIG. The rear view from the vehicle rear side of the seat belt device, FIG. 5 is a timing chart of this embodiment.

First, an outline of the rear impact airbag device of the present embodiment will be described.
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 passenger compartment C and the cargo compartment T is extended, and a rear seat 5 is installed on the upper surface of the floor panel 3 via a slide rail 4.

  A rear side frame 31 extending in the vehicle front-rear direction is disposed below the floor panel 3, and a rear collision sensor 32 constituted by an acceleration sensor is installed at the rear end portion of the rear side frame 31.

  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.

  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, in order to secure the cabin C as much as possible, the seat back 53 and the back door 1 are set to be close to each other, and the rear seat 5 is slid to the rearmost part. When the back 53 is reclined (inclined backward), 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 a pretensioner device used in a seat belt device or the like, 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. Therefore, the airbag cushion 21 can be surely provided with an occupant restraining function.

  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 expands in a substantially square shape, and functions to position the side end portion of the airbag cushion 21 along the side end portion of the back window 11. There is also.

  Further, the airbag cushion 21 is a portion where the front surface and the rear surface of the airbag cushion 21 face each other between the headrests 54 so as to avoid the headrests 54 of the rear seat 5. Are provided with a plurality of stitching lines 21c extending in the vertical direction. 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, even if the airbag cushion 21 is deployed and inflated in this way, the function cannot be exhibited if the occupant moves backward before the deployment and inflation.

  Therefore, in order to suppress the early rearward movement of the occupant P as much as possible, in the present embodiment, as shown in FIGS. 3 and 4, the lower half of the occupant P is restrained by the seat belt device 6 at the time of a rear collision. Yes.

  The seat belt device 6 includes a retractor device 61 (winding device) installed in the rear pillar 7, a belt member 62 pulled out from the retractor device 61, and an end of the belt member 62 fixed to a floor panel in the vicinity of the retractor device 61. And a buckle member 64 that extends from the floor panel 3 on the opposite side of the anchor member 63 and fixes the belt member 62.

  The above-described belt member 62 is provided with a tongue plate 65 movable along the belt member 62, and the front end of the tongue plate 65 is configured to be inserted and fixed to the buckle body 64 a of the buckle member 64. The belt device 6 can be attached.

  In the present embodiment, the buckle member 64 includes a buckle body 64a, a connecting member 64b, and a pretensioner device 64c (buckle pretensioner device) in order to restrain the lower body of the occupant P during a rear collision. That is, the tongue plate 65 is inserted, and the pretensioner device 64c that applies tension is provided on the buckle member 64 that restrains the lower half of the occupant P.

  In this way, by providing the pretensioner device 64c to the buckle member 64, it is possible to directly apply tension to the belt member 62c that restrains the lower body, and therefore the lower body of the occupant P can be restrained reliably.

  When the pretensioner device 64c is operated at the time of a rear collision, a tension is applied to the belt member 62c that restrains the lower body in the direction indicated by the arrow in FIGS. 3 and 4 to generate the tension.

  When tension is generated in this direction, the lower half of the occupant P is pressed toward the seat cushion 51 by the belt member 62 and is restrained by the seat cushion 51. Therefore, even if the seat back 53 moves rearward due to the impact at the time of the rear collision, the upper body of the occupant P leans back and the belt member 62 is detached from the shoulder of the occupant P, the backward movement of the occupant P can be prevented. (Refer to the occupant P in the chain line in FIG. 3).

  Further, if a fixing member for fixing the position of the belt member 62 is provided on the tongue plate 65, and the position of the belt member 62 is fixed at the time of a rear collision, the belt member 62b that restrains the upper body is prevented from being pulled downward. Therefore, the lower body of the occupant P can be restrained more reliably.

  Further, the retractor device 61 may be further provided with a pretensioner device so that the slack of the belt member 62 that has come off the shoulder of the occupant P is taken up by the retractor device 61 in the event of a rear collision. In this case, the restraining force of the belt member 62 can be increased more reliably.

  FIG. 5 is a timing chart showing the operation timing of the pretensioner device 64 c and the operation timing of the airbag device 2.

  As shown in this figure, when the rear impact starts at the timing (a), the airbag device 2 and the pretensioner device 64c are (a) and (c) almost simultaneously when the impact value becomes a predetermined value or more. ) Start operation at the timing. The start of the operation of the pretensioner device 64c may not be the same as that of the airbag device 2 as long as the restraining force is applied before the backward tilting starts.

  The pretensioner device 64c completes the operation immediately and restrains the lower body of the occupant P to the seat cushion 51 in Δt1 time (about 2 to 3 ms), but the airbag device 2 completes the operation (of the airbag cushion 21). It takes about Δt2 time (about 20 ms) until the expansion and expansion is completed, and after the operation is completed, the occupant restraining function and the impact absorbing function are exhibited.

  By operating in this way, the pretensioner device 64c performs early occupant restraint, and then the airbag device 2 reliably performs occupant restraint.

  That is, by suppressing the occupant's rearward movement at an early stage by the pretensioner device 64c, even if the rearward movement of the seat back 53 occurs after the operation of the pretensioner device 64c is completed, The shock absorbing function can be reliably ensured.

  In addition, the airbag device 2 gradually leaks gas from the airbag cushion after deployment and inflation, but the pretensioner device 64c is substantially free from such a phenomenon, and thus it is long even if the operation is started early. High binding force can be maintained for a long time.

Next, the operation and effect of the present embodiment configured as described above will be described in detail.
A vehicle V including the back door 1 and the rear impact airbag device 2 according to this embodiment has a rear seat 5 provided with a seat back 53 in front of the back door 1 at the rear end of the vehicle. The vehicle V includes a rear collision airbag device 2 in which an airbag cushion 21 can be interposed between the seat back 53 and the back door 1 at the time of rear collision. When the seat back 53 receives a rear impact load, the rear seat 5 can be moved rearward under the load of the occupant, and is installed on the rear seat 5 from the waist of the occupant P to the crotch portion. Tension is applied to the belt member 62a that extends substantially in the vehicle width direction and presses toward the seat cushion 51, and the belt member 62a that restrains the lower body at the time of a rear collision, so that the occupant P is seated. Cushion Those having a pretensioner device 64c for pressing the 51 side.

  According to the above configuration, the seat back 53 of the rear seat 5 moves rearward under the load of the occupant P when receiving a rear collision load, but seats a part between the lumbar portion and the crotch portion of the occupant P. The pretensioner device 64c applies tension to the belt member 62a that restrains the lower body that is pressed toward the cushion 51, so that the lower body of the occupant P is pressed toward the seat cushion 51.

  For this reason, at the time of a rear collision, the occupant P is restrained by the seat cushion 51 by the belt member 62a that restrains the lower body, and the rearward movement of the occupant P is suppressed.

  Therefore, in the vehicle V including the back door 1 and the rear collision airbag device 2, even when the seat back 53 moves backward due to an impact at the time of the rear collision, the occupant P is restrained and reliably The airbag cushion 21 can be deployed and inflated between the head of the occupant P and the back door 1 to obtain the impact absorbing function and the occupant restraining function of the rear impact airbag device 2.

  In this embodiment, the pretensioner device 64c is provided on the buckle member 64 that fixes the belt member 62a that restrains the lower body.

  According to the above configuration, the pretensioner device 64c is provided on the buckle member 64 that fixes the belt member 62a that restrains the lower body, and tension is applied to the belt member 62a at the time of a rear collision.

  For this reason, a tension | tensile_strength can be directly provided to the belt member 62a which restrains a lower half body, and the back movement of the passenger | crew P at the time of a rear collision can be suppressed reliably.

  Further, in this embodiment, a belt member 62b that restrains the upper body of the occupant P that is continuous with the belt member 62a that restrains the lower body is supported by the intermediate portion 71 of the rear pillar 7 (see FIG. 3).

  According to the above configuration, the belt member 62 a that restrains the upper body of the occupant P is supported by the intermediate portion 71 of the rear pillar 7.

  For this reason, the retractor device 61 of the belt member 62 does not have to be installed on the seat back 53, so that the weight of the seat back 53 can be reduced, and the rear movement of the seat back 53 due to an impact at the time of a rear impact. On the other hand, even if the shoulder of the occupant P cannot be supported, the occupant P is restrained to the seat cushion 51 by the belt member 62a that restrains the lower half of the body, so that the effect of restraining the occupant can be obtained more effectively.

  Next, a second embodiment shown in FIGS. 6 and 7 will be described. Similarly to the first embodiment, this embodiment also includes a pretensioner device 63c that applies tension to the belt member 62a that restrains the lower body. In addition, about the component same as 1st embodiment, a code | symbol is attached | subjected and description is abbreviate | omitted.

  In the second embodiment, the pretensioner device 63c is provided not on the buckle member 64 side but on the anchor member 63 side that fixes the end of the belt member 62 to the floor panel 3. That is, by connecting the belt member 62 directly to the pretensioner device 63c (lap pretensioner device) and fixing the pretensioner device 63c to the floor panel 3, the end portion of the belt member 62 is provided without providing the anchor member 63. Is fixed to the vehicle body side.

  As described above, even when the pretensioner device 63c is provided on the anchor member 63 side, the tension can be directly applied to the belt member 62a that restrains the lower half of the occupant P, as in the first embodiment. The lower body of the passenger P can be restrained.

  Also in the second embodiment, when the pretensioner device 63c is operated at the time of a rear collision, a tension is applied to the belt member 62a that restrains the lower body in a direction indicated by an arrow in FIGS. appear.

  When tension is generated in this direction, the lower body of the occupant P is pressed toward the seat cushion 51 by the belt member 62 and is restrained by the seat cushion 51. Therefore, also in this embodiment, the occupant P is prevented from moving backward. (See the dashed line in FIG. 6).

  Therefore, since the occupant restraint can be performed early in the second embodiment as well, the occupant restraint function and shock absorption of the airbag device 2 described above can be suppressed as in the first embodiment. Functions can be ensured.

Next, the operation and effect of the present embodiment configured as described above will be described in detail.
In this embodiment, the pretensioner device 63c is provided on the anchor member 63 side that fixes one end of a belt member 62a that restrains the lower body to the floor panel 3.

  According to the above configuration, the pretensioner device 63c is provided on the anchor member 63 side that fixes one end of the belt member 62a that restrains the lower body to the floor panel 3, and tension is applied to the belt member 62a at the time of a rear collision. become.

For this reason, a tension | tensile_strength can be directly provided to the belt member 62a which restrains a lower half body, and the back movement of the passenger | crew P at the time of a rear collision can be suppressed reliably.
Other functions and effects are the same as those in the first embodiment.

  In the first embodiment and the second embodiment described above, the tension is applied only by one pretensioner device. However, the tension may be applied by two pretensioner devices in combination of both embodiments.

  Next, a third embodiment shown in FIGS. 8 to 13 will be described. In the third embodiment, by providing various mechanisms in the rear seat 5, the occupant's restraining function is further enhanced, and the occupant protection at the time of a rear collision is enhanced. In addition, about the component same as the above-mentioned embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

First, the structure of the rear seat 5 will be described with reference to FIG.
The rear seat 5 is provided with a seat slide tensioner device 100 below the seat cushion 51, and is configured to automatically slide and move the entire rear seat 5 to the front side of the vehicle at the time of a rear collision.

  The seat slide tensioner device 100 includes a tension cylinder 101 that generates tension at the time of a rear collision, a wire member 102 that is connected to the tip of the tension cylinder 101 and fixed to the lower portion of the seat cushion 51, and reverses the movement of the wire member 102. And a pulley unit 103 for guiding.

In the seat slide tensioner device 100, the tension cylinder 101 pulls the wire member 102 to the vehicle rear side at the time of a rear collision, and the wire member 102 is pulled, so that the seat cushion 51 is moved to the vehicle front side via the pulley portion 103. The entire rear seat 5 is pulled and slid along the slide rail 4 toward the front side of the vehicle.
Thereby, at the time of a rear collision, the rear seat 5 moves to the vehicle front side.

  The rear seat 5 is provided with a seat belt device 106 with a built-in seat so that the binding force of the belt member 62 does not change even if the rear seat 5 moves in the vehicle front-rear direction.

  The seat belt device 106 with a built-in seat includes a retractor device 161 installed inside the seat back 53, a belt member 162 pulled out from the retractor device 161, and an anchor member 163 that fixes an end of the belt member 162 to the lower portion of the seat cushion 51. A buckle member 164 that fixes the belt member 62 to the lower portion of the seat cushion 51 on the opposite side of the anchor member 163, a guide arm 165 that guides the belt position so that the belt member 162 securely locks the shoulder of the passenger P, Consists of.

  In this embodiment, the guide arm 165 is fixed to the upper end of the seat back 53. However, the guide arm may be provided integrally with the headrest, or the guide arm and the retractor device are integrated with the seat. You may install in the upper end of a bag. Further, only the guide arm may be provided on the seat back, and the retractor device may be provided on the vehicle body side.

  Since the detailed structure of the seatbelt device 106 with a built-in seat is the same as that of the first and second embodiments except that the seatbelt device 106 moves in the vehicle front-rear direction together with the rear seat 5, detailed description thereof is omitted.

  Unlike the first and second embodiments, the pretensioner device 161a (see FIG. 11) that applies tension to the belt member 162 is provided in the retractor device 161. However, the retractor device 161 with a pretensioner device is also provided. Since it is publicly known, detailed description is omitted.

  A weight sensor 120 for detecting the weight of the seated occupant P is installed in the center of the seat cushion 51 of the rear seat 5. The weight sensor 120 is configured to detect whether the occupant P is an adult or a child.

  Furthermore, the reclining detection sensor 130 which detects whether the seat back 53 is a reclining state is provided in the hinge part 52 with a reclining mechanism. By providing the reclining detection sensor 130, control according to the reclining state is performed.

The system block diagram of FIG. 11 is a diagram showing a control block of the present embodiment.
The rear collision safety control unit 140, which is a central processing unit for this control, is connected to a vehicle speed sensor 141, a rear collision sensor 32, a weight sensor 120, and a reclining detection sensor 130 as input means. It is configured to capture various data. The rear collision safety control unit 140 is connected to the inflator 22 as output means, the seat slide tensioner device 100, and the pretensioner device 161a provided in the retractor device 161, and controls the operation of these devices. It is configured to do.

  Furthermore, a timing setting unit 140a for setting the operation timing of the inflator is provided in the rear collision safety control unit 140, which is a central processing unit, and is configured to set the operation timing based on the degree of collision or the like.

The control of this embodiment is performed based on the flowchart of FIG.
First, in S1, data is fetched from each sensor described above. In S2, it is determined whether or not there is a rear collision. If it is not determined that there is a rear collision (in the case of N), the process proceeds to S1 again to capture data.

If it is determined in S2 that there is a rear collision (in the case of Y), the process proceeds to S3, and the airbag operation start timing _TAB is set. The airbag operation start timing T _AB is set to a short time (for example, 2 ms) when, for example, it is determined that a heavy collision is caused by the vehicle speed or the like, and is relatively long (for example, 4 ms) when it is determined to be a light collision. ).

Next, in S4, the timer count of the air bag operation start timing T _AB set in S3 is started.

  In S5, the seat slide tensioner device 100 is operated. By operating the seat slide tensioner device 100 early in this manner, the rear seat 5 can be moved to the front side of the vehicle before the slide rail 4 or the like is damaged, so that the rear seat 5 is reliably moved to the front side. can do.

  Next, in S6, it is determined whether the weight (body weight) of the occupant P is greater than or equal to a predetermined value. 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 S8 and the pretensioner device 161a in the retractor device 161 is operated. In this case, since it is considered that an adult with a heavy weight is seated on the rear seat 5, by restraining the occupant P, the occupant P is prepared in case the seat back 53 moves backward by the load of the occupant P. The rear movement of the is suppressed.

  On the other hand, if it is not determined in S6 that the value is equal to or greater than the predetermined value (in the case of N), the process proceeds to S7 to determine whether or not the seat back 53 is in the reclining state. Here, when it is determined that the reclining state is set (in the case of Y), the process proceeds to S8 to operate the pretensioner device 161a in the retractor device 161. In this case, although it is considered that a light weight child is seated, since the seat back 53 is already tilted backward in the reclining state, the occupant P may move backward regardless of the weight of the occupant P. Therefore, the occupant P is restrained and the backward movement is suppressed.

  However, when it is determined that the reclining state is set in S7 (in the case of N), the process proceeds to S9 without operating the pretensioner device 161a in the retractor device 161 as it is. In this case, since a child with a light weight is seated, the rear movement of the seat back 53 does not occur, and the rear movement of the occupant P can be suppressed by the standing seat back 53 without restraining the occupant P. . In this case, if the pretensioner device 161a is operated, the occupant P is restrained excessively, and there is a possibility that the occupant P is shocked. Therefore, the pretensioner device 161a is not operated.

Next, in S9, and determines whether the current time T becomes the air bag operation start timing T _AB set in S4. When it is determined that the airbag operation start timing _TAB has been reached (in the case of Y), the process proceeds to S10, the inflator 22 of the airbag device 2 is operated, and the airbag cushion 21 is deployed and inflated. On the other hand, when it is not determined to have become the air bag operation start timing T _AB (case of N), without shifting to S10, in S9 again, a determination until the air bag operation start timing T _AB, final In S10, the inflator 22 of the airbag device 2 is operated to finish the control.

The behavior of the rear part of the vehicle when this control is performed will be described with reference to FIGS.
FIG. 8 shows the state of the rear part of the vehicle at the normal time before the rear collision (states S1 to S2), FIG. 9 shows the state in which the rear seat 5 is slid forward (state of S5) immediately after the rear collision, and FIG. It is the side view which showed the state (state of S10) which expanded the airbag cushion 21 later.

  First, as shown in FIG. 8, since a slight space is secured behind the seat back 53, the occupant P can freely recline the seat back 53 as indicated by a one-dot chain line.

  However, if a rear collision occurs, the seat back 53 moves rearward due to the impact, so that the rear seat 5 is moved to the front side of the vehicle as shown in FIG. Is secured in advance.

  At almost the same time, the pretensioner device 161 a is operated to restrain the upper body of the occupant P to the seat back 53.

  Then, at the later stage of the rear collision, as shown in FIG. 10, the seat back 53 moves backward. At this time, since the belt member 62 is supported by the guide arm 165, the belt member 62 also moves backward. As a result, the belt member 62 does not come off the shoulder of the passenger P. Therefore, the passenger | crew P can prevent the further back movement.

  Further, since the upper body of the occupant P is restrained by the seat back 53 by the pretensioner device 161a, even if the seat back 53 moves backward, there is no further rearward movement of the occupant P.

  Further, even if the seat back 53 moves rearward, the airbag cushion 21 of the airbag device 2 is deployed and inflated behind the seat cushion 53, so that the occupant P can be reliably prevented from moving backward.

  As described above, also in the third embodiment, the occupant restraining function and the shock absorbing function of the airbag device 2 described above are reliably ensured because the rearward movement of the occupant is suppressed by means for restraining the occupant to the rear seat 5 or the like. Can be secured.

The operation timing of the present embodiment will be described with reference to the timing chart of FIG.
First, when the rear impact starts at the timing of (f), when the impact value becomes equal to or higher than the predetermined value, the pretensioner device 161a and the seat slide tensioner device 100 are almost at the timing of (ku) and (ke). At the same time start operation. Then, the operation of the pretensioner device is completed in a short Δt3 time (for example, 2 to 3 ms), and then the operation of the seat slide tensioner device 100 is also completed in a longer time Δt4 time (for example, 50 ms or more). .

  At this time, even if the seat back is damaged and moved backward (tilt backward) after the operation of the pretensioner device 161a is completed, the occupant is already restrained by the rear seat 5 by the completion of the operation of the pretensioner device 161a, and the seat slide Since the seat slide by the tensioner device 100 is also operating or has completed the operation, a sufficiently long space is formed between the head of the occupant P and the back door 1 in the vehicle front-rear direction.

  Then, the determination impact value at the start of the operation of the pretensioner device or the seat slide tensioner device is set so that the airbag device 2 starts the operation slightly later than the operation timing of the pretensioner device 161a and the seat slide tensioner device 100. The airbag device is operated with a determination impact value (second threshold) larger than (first threshold determined by acceleration and speed). This operation is completed in Δt5 time (for example, 20 to 30 ms).

The timing of this (g), as described above, a timing T _AB which is determined by the timing setting unit 140a, varies by collision degree.

  By operating each device at such an operation timing, occupant protection at the time of a rear collision can be more reliably performed.

  Note that a collision prediction sensor may be provided, and when the collision prediction is detected, the seat slide tensioner device 100 may be configured to operate before the collision. In this case, when the seat slide tensioner device 100 is operated at the time of a rear collision, it is possible to solve the problem that the load applied to the seat back 53 is further increased and the seat back 53 easily moves backward.

  In addition, the pretensioner device 161a may be configured to operate before the collision. In this case, it is possible to obtain an effect that the occupant restraint during the seat slide can be ensured.

Next, the operation and effect of the present embodiment configured as described above will be described in detail.
A vehicle V including the back door 1 and the rear impact airbag device 2 according to this embodiment has a rear seat 5 provided with a seat back 53 in front of the back door 1 at the rear end of the vehicle. The vehicle V includes a rear collision airbag device 2 in which an airbag cushion 21 can be interposed between the seat back 53 and the back door 1 at the time of rear collision. When the seat back 53 receives a rear collision load, the rear seat 5 can be moved rearward under the load of the occupant, and is installed at the upper end of the seat back 53 of the rear seat 5. And a guide arm 165 that supports a belt member 62b that locks the shoulder portion of the belt.

  According to the above configuration, the seat back 53 of the rear seat 5 moves rearward under the load of the occupant when receiving a rear impact load, but the guide arm 165 installed at the upper end of the seat back 53 By supporting the belt member 62 b that locks the shoulder portion, the belt member 62 b that restrains the upper body moves backward together with the seat back 53.

  For this reason, the rearward movement of the occupant is suppressed because the belt member 62b that restrains the upper body from the shoulder of the occupant cannot be removed at the time of a rear collision.

  Therefore, in the vehicle V including the back door 1 and the rear impact airbag device 2, even when the seat back 53 moves backward due to an impact at the time of the rear impact, the passenger is restrained and reliably By deploying and inflating the airbag cushion 21 between the head of the occupant and the back door 1, the impact absorbing function and the occupant restraining function of the rear impact airbag device 2 can be obtained.

  Further, in this embodiment, a pretensioner device 161a that applies tension to the belt member 62b and presses the occupant toward the seat back 53 at the time of a rear collision is provided.

  According to the above configuration, at the time of rear collision, tension is applied to the belt member 62b that restrains the upper body by the pretensioner device 161a, and the occupant is pressed toward the seat back 53 side.

  For this reason, at the time of a rear collision, the occupant is restrained by the seat back 53 by the belt member 62a that restrains the upper body, and the rearward movement of the occupant is reliably suppressed.

  In this embodiment, the pretensioner device is provided in the retractor device. However, as in the first and second embodiments, the pretensioner device is provided on the buckle member side or the anchor member side. May be.

  In this embodiment, the rear seat 5 is provided with a reclining mechanism for changing the inclination angle of the seat back 53 to the reclining state.

  According to the above configuration, the tilt angle of the seat back 53 of the rear seat 5 can be changed to the reclining state by the reclining mechanism.

  For this reason, the rear seat 5 that meets the use needs of the occupant P can be obtained, and even when the seat back 53 is in the reclining state, the occupant can be restrained at the time of a rear collision, so that the occupant can reliably move backward. Can be suppressed.

  Further, in this embodiment, the rear seat 5 is provided with a reclining detection sensor 130 for detecting the reclining state of the seat back 53, and even when the weight detected by the weight sensor 120 is equal to or less than a predetermined value, the reclining detection is performed. When the sensor 130 detects that the seat back 53 is in the reclining state, the rear collision safety control unit 140 that operates the pretensioner device 161a is provided.

  According to the above configuration, even when the weight detected by the weight sensor 120 by the rear collision safety control unit 140 is equal to or less than the predetermined value, the operation of the pretensioner device 161a is performed when the seat back 53 is in the reclining state. Will do.

  Therefore, when the seat back 53 is in the reclining state, even if a lightweight occupant is seated, the belt member 62 is restrained by the pretensioner device 161a, and the occupant is reliably restrained. can do.

  That is, even if the occupant is a lightweight occupant such as a child, the seat back 53 has already moved backward (backward tilted) in the reclining state, so that the occupant moves backward regardless of the weight. There is a fear. In this case, by restraining the occupant with the pretensioner device 161a, the rearward movement of the occupant can be reliably suppressed.

  The rear seat 5 is provided only with a weight sensor 120 for detecting the weight of the occupant. When the weight detected by the weight sensor 120 is equal to or less than a predetermined value, the operation of the pretensioner device 161a is always prohibited. The rear collision safety control unit 140 may be controlled.

  According to this configuration, the weight sensor 120 detects the weight of the occupant of the rear seat 5, and when the weight is equal to or less than a predetermined value, the rear collision safety control unit 140 always prohibits the operation of the pretensioner device 161a. It will be.

  For this reason, when a lightweight occupant (for example, a child) is seated on the rear seat 5, the belt member 62b is not restrained by the pretensioner device 161a even at the time of a rear collision. Therefore, it is possible to prevent excessive restraint.

  That is, in the case of a lightweight occupant, the load is difficult to be applied to the seat back 53, and therefore the rear movement of the seat back 53 is small and the rear movement of the occupant is also small. In this situation, if the restraint force of the belt member 62 is excessively increased by the pretensioner device 161a, an impact is given to the occupant, so that the occupant is protected by not operating the pretensioner device 161a. It is.

  Further, the control of the pretensioner device (prohibition control) performed by detecting the weight of the occupant and the control of the pretensioner device (prohibition control) performed according to the occupant's weight and the reclining state of the seat back are performed as described above. You may apply to embodiment and 2nd embodiment.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The belt member for the lower body of the present invention corresponds to the belt member 62a for restraining the lower body of the embodiment,
Similarly,
The upper body belt member corresponds to the belt member 62b that restrains the upper body,
The tension applying means corresponds to the pretensioner devices 63c, 64c, 161a,
The seat belt support portion corresponds to the guide arm 165,
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 side view including the seatbelt apparatus of 1st embodiment. The rear view from the vehicle rear of the seatbelt apparatus of 1st embodiment. The timing chart of 1st embodiment. The side view including the seatbelt apparatus of 2nd embodiment. The rear view from the vehicle rear of the seatbelt apparatus of 2nd embodiment. The vehicle rear part side view at the normal time of 3rd embodiment. The vehicle rear part side view immediately after the rear collision of 3rd embodiment. The vehicle rear part side view after the rear collision of 3rd embodiment. The system block diagram of 3rd embodiment. Control flowchart of the third embodiment Timing chart of the third 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 2 ... Airbag device 5 ... Rear seat 51 ... Seat cushion 53 ... Seat back 62 ... Belt members 63c, 64c, 161a ... Pretensioner device (tension applying means)
165 ... Guide arm (seat belt support)

Claims (9)

A rear seat having a seat back is installed in front of the back door at the rear end of the vehicle, the seat back is disposed close to the back door, and an air bag is provided between the seat back and the back door at the time of a rear collision. A vehicle equipped with a rear-impact airbag device capable of interposing a cushion,
The rear seat can move rearward under the load of the occupant when the seat back receives a rear collision load,
A belt member for a lower body that is installed in the rear seat and extends at least a part between the waist and the crotch of the occupant in the vehicle width direction and presses it toward the seat cushion;
A vehicle including a back door having a tension applying means for applying tension to the lower body belt member and pressing an occupant toward the seat cushion at the time of a rear collision and a rear collision airbag device. 2. A vehicle comprising a back door and a rear impact airbag device according to claim 1, wherein the tension applying means is a tensioner device installed on a connecting member for fixing a buckle of the lower body belt member to a vehicle body side member. The vehicle including the back door and the rear impact airbag device according to claim 1, wherein the tension applying means is a tensioner device installed at an anchor portion that fixes one end of the lower body belt member to a vehicle body side member. The vehicle comprising the back door and the rear impact airbag device according to claim 1, wherein an upper body belt member that restrains the upper body of an occupant that is connected to the lower body belt member is supported by an intermediate portion of the pillar. A rear seat having a seat back is installed in front of the back door at the rear end of the vehicle, the seat back is disposed close to the back door, and an air bag is provided between the seat back and the back door at the time of a rear collision. A vehicle equipped with a rear-impact airbag device capable of interposing a cushion,
The rear seat can move rearward under the load of the occupant when the seat back receives a rear collision load,
A vehicle including a back door having a seat belt support portion that is installed at an upper end portion of a seat back of the rear seat and supports an upper body belt member that locks a shoulder portion of an occupant and a rear impact airbag device. 6. A vehicle comprising a back door and a rear collision airbag device according to claim 5, further comprising tension applying means for applying tension to the upper body belt member at the time of rear collision and pressing an occupant toward the seat back. The rear seat is provided with weight detection means for detecting the weight of the occupant,
The back door and the rear impact airbag device according to claim 1, further comprising a control unit that prohibits the operation of the tension applying unit when the weight detected by the weight detection unit is equal to or less than a predetermined value. vehicle. The vehicle provided with the back door of Claim 1 or 6 which provided the reclining mechanism which changes the inclination-angle of a seat back into a reclining state in the said rear seat. The rear seat is provided with a reclining mechanism for changing the inclination angle of the seat back to the reclining state,
The control means for operating the tension applying means when the seatback inclination angle is set to the reclining state even when the weight detected by the weight detecting means is equal to or less than a predetermined value. A vehicle equipped with a back door and a rear impact airbag device.

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