JP4059176B2 - Vehicle seat structure - Google Patents

Description

  The present invention relates to a vehicle seat structure that protects an occupant's neck during a rear-end collision.

  The neck may be damaged due to the difference in the relative movement between the head and chest of the occupant during a rear-end collision. Thus, various countermeasures against whiplash have been taken, and the outline thereof will be described below.

  In the example shown in FIG. 6, the relative distance between the occupant's head 100 and the headrest 102 is set short in advance. In addition, the position of the headrest 102 of the dashed-two dotted line added for the comparison is a position of a normal headrest.

  Further, in the example shown in FIG. 7, a hard plate 112 is embedded in the seat back 110 and the plate 112 and the headrest 114 are connected by a link 116 to interlock with the movement of the occupant at the time of a rear collision. The headrest 114 is displaced toward the front side of the vehicle. That is, when the occupant's chest 118 is pressed against the seat back 110 at the time of a rear collision, the movement is transmitted to the headrest 114 via the plate 112 and the link 116, thereby the headrest 114 is displaced to the front side of the vehicle. It is.

Further, in the example shown in FIG. 8, the front portion 124 (shaded portion) of the seat back 120 is made soft using low-hardness urethane or the like, and the upper body 122 of the occupant is placed in front of the seat back 120 at the time of a rear collision. The relative distance between the occupant's head 126 and the headrest 128 is reduced by sinking into the portion 124.
JP-A-10-287164 JP 2000-325179 A JP 2001-150993 A

However, in the case of the first structure , the distance between the head 100 of the occupant and the headrest 102 during normal use is too short, so that the occupant's head 100 easily hits the headrest 102. For this reason, there is a possibility that the driving operation may be hindered.

  In the case of the second structure, since the hard plate 112 for pressing the headrest 114 is embedded in the seat back 110, there is a sense of incongruity or a foreign object when the plate 112 is pressed on the back of the occupant, and the sitting comfort deteriorates. . In addition, since the movement of the occupant's chest 118 is transmitted to the occupant's head 119 using the link 116, the reverse movement is also transmitted. That is, when the head 119 pushes the headrest 116 to the vehicle rear side, the occupant's chest 118 is pushed to the vehicle front side by the plate 112. For this reason, the relative displacement between the occupant's head 119 and the occupant's chest 118 may increase.

  In the case of the third structure, the amount of sinking into the seat back 120 changes depending on the occupant's physique, so the amount of sinking of the occupant's upper body 122 into the seat back 120 may be insufficient depending on the occupant's physique. Conceivable. In this case, the restraint of the occupant's head 126 by the headrest 128 is also insufficient.

  In view of the above facts, the present invention provides a vehicle seat structure capable of effectively suppressing or preventing the occupant from whipping at the time of a rear collision without impairing the driving operation and sitting comfort during normal traveling. Is the purpose.

The vehicle seat structure according to the first aspect of the present invention includes a seat cushion on which an occupant is seated, and a seat that is disposed in a standing state at a rear end portion of the seat cushion and is tiltable about a reclining central axis. A vehicle seat structure including a back and a headrest disposed at an upper end portion of the seat back and supporting a head of an occupant, the vehicle seat structure being provided on a lower end portion side of the seat back, the reclining center An extension portion that extends downward from the shaft, and is provided in the seat cushion and connected to the extension portion, and the extension portion is moved to the rear side of the seat by an inertial force that acts on an occupant during a rear-end collision. And a connecting means for pressing.

A vehicle seat structure according to a second aspect of the present invention is the vehicle seat structure according to the first aspect, wherein only the seat cushion is provided so as to be slidable in the front-rear direction of the seat at the time of a rear collision, and to an occupant at the time of the rear collision. The seat is slid to the seat rear side by an acting inertia force, and the connecting means presses the extending portion to the seat rear side in conjunction with the slide operation of the seat cushion to the seat rear side.

A vehicle seat structure according to a third aspect of the present invention is the vehicle seat structure according to the first aspect, wherein the seat cushion is provided so as not to slide in the front-rear direction of the seat at the time of a rear collision, and the connecting means is extendable. The rear collision detection means constituted by a bag provided in the seat back of the vehicle seat and sealed with gas or liquid is pressed by the inertial force acting on the occupant, thereby causing the rear collision state. When detected , gas or liquid in the bag is supplied to the connecting means, so that the connecting means is extended to press the extending portion to the rear side of the seat.

  A vehicle seat structure according to a fourth aspect of the present invention is characterized in that, in the second aspect of the invention, the connecting means is constituted by a member that does not expand and contract or bend.

  A vehicle seat structure according to a fifth aspect of the present invention is the vehicle seat structure according to the second aspect of the invention, wherein the connecting means is formed by a plurality of links and a part of the guide cushion is provided on the seat cushion. The other portions are engaged with each other so as to be movable relative to each other, and the seat cushion slides to the rear side of the seat at the time of a rear collision. Is changed and the extension part is pressed.

According to the present invention of claim 1, wherein, at the rear-end collision, the inertial force acting on the occupant, and more connection means provided in the seat cushion, extending portion provided at the lower end side of the seat back It is pressed to the seat back rear side. Since the extending portion extends downward from the reclining center axis of the seat back, when the extending portion is pressed to the rear side of the seat, the seat back is moved by a predetermined amount around the reclining central axis toward the seat cushion. It is rotated. Thereby, the distance of a headrest and a passenger | crew's head is shortened. As a result, the difference in the amount of relative movement of the occupant's head relative to the occupant's chest during a rear-end collision can be minimized.

  Furthermore, according to the present invention, during normal traveling, the extension portion is not pressed by the connecting means, so that the distance between the headrest and the occupant's head is kept moderate. Therefore, the passenger's driving operation is not hindered.

  In addition, according to the present invention, the entire seat back is rotated around the reclining hinge shaft toward the seat cushion side by pressing the extending portion provided on the lower end side of the seat back toward the seat rear side. Therefore, it is not necessary to incorporate a special device or the like in the seat back in advance. Therefore, the passenger's sitting comfort is not impaired.

According to the present invention described in claim 2, only the seat cushion to the rear-end collision is provided to be slidable in the longitudinal direction a sheet, becomes to the after end collision, the seat cushion seat rear side by the inertia force acting on the occupant Slide to. In conjunction with this movement, the connecting means disposed in the seat cushion presses the extending portion disposed on the lower end side of the seat back to the seat rear side. As a result, the seat back is rotated toward the seat cushion side about the reclining rotation center axis.

As described above, in the present invention, only the seat cushion is provided so as to be slidable in the front-rear direction of the seat at the time of the rear impact, and the seat cushion is slid to the rear side of the seat using the inertial movement of the occupant at the time of the rear impact. Since the seat back is rotated in conjunction with the seat cushion, the connecting means only needs to have a function of simply connecting the seat cushion and the extending portion of the seat back.

According to the third aspect of the present invention, since the seat cushion is provided so as not to be slidable in the front-rear direction of the seat at the time of rear collision, the seat cushion does not slide to the rear side of the seat at the time of rear collision. The connecting means is provided to be extendable. When the rear collision occurs, the bag provided in the vehicle seat back is pressed by the inertial force acting on the occupant. Since gas or liquid is sealed inside the bag, when the bag is pressed, an amount of gas or liquid proportional to the amount of pressing is supplied to the connecting means. Thereby, a connection means is expanded and an extension part is pressed to the sheet back side. As a result, the seat back is rotated to the seat cushion side about the reclining rotation center axis.

As described above, in the present invention, when the rear impact state is detected by the bag in which the connecting means can be expanded and contracted instead of providing the seat cushion so as not to be slidable in the front-rear direction of the seat at the time of the rear impact, Since the connecting means is extended and the seat back is rotated toward the seat cushion, it is not necessary to set a slide mechanism at the time of the rear impact on the seat cushion.

  According to the fourth aspect of the present invention, since the connecting means is constituted by a member that does not expand and contract or bend, when the seat cushion slides to the rear side of the seat by the inertial force acting on the occupant at the time of the rear collision, the connecting means also It is displaced as it is to the rear of the seat. Then, the extension portion is pressed toward the seat rear side by an amount by which the connecting means is displaced toward the seat rear side, and the seat back is rotated toward the seat cushion around the reclining central axis. That is, the seat back can be rotated by an amount corresponding to the amount of rearward displacement of the seat cushion at the time of a rear collision.

  According to the fifth aspect of the present invention, when the seat cushion is slid to the rear side of the seat by the inertial force acting on the occupant at the time of the rear collision, the guide portion provided on the seat cushion is also displaced by the same amount in the same direction. Here, in the present invention, the connecting means is constituted by a plurality of links, and a part of the connecting means is engaged with the guide portion so as to be relatively movable. Intersection angle of multiple links is changed. Since the other part of the plurality of links is locked to the extension part, the extension part is pressed toward the seat rear side by changing the intersection angle of the plurality of links. As a result, the seat back is rotated to the seat cushion side about the reclining central axis. That is, also in the present invention, the seat back can be rotated by an amount corresponding to the rear displacement amount of the seat cushion at the time of rear collision.

As described above, the vehicle seat structure according to the first aspect of the present invention includes the extension portion provided on the lower end side of the seat back and extending downward from the reclining central axis, and the seat cushion. And a connecting means that is connected to the extension portion and is connected to the extension portion and presses the extension portion to the rear side of the seat by an inertial force acting on the occupant at the time of the rear collision. The difference in the relative movement amount can be minimized, and as a result, it is possible to effectively suppress or prevent the occupant from whipping at the time of a rear impact without impairing the driving operation and sitting comfort during normal driving. It has an excellent effect of being able to.

The vehicle seat structure according to the second aspect of the present invention is the vehicle seat structure according to the first aspect, wherein only the seat cushion is provided so as to be slidable in the front-rear direction of the seat at the time of the rear collision and acts on the occupant at the time of the rear collision. The connecting means is configured to push the extension part to the seat rear side in conjunction with the sliding operation of the seat cushion to the seat rear side by the inertial force, so the connecting means is simply the seat It is only necessary to have a function of connecting the cushion and the extending portion of the seat back, and as a result, there is an excellent effect that the structure of the connecting means can be simplified and the size and weight can be reduced.

A vehicle seat structure according to a third aspect of the present invention is the vehicle seat structure according to the first aspect, wherein the seat cushion is provided so as not to be slidable in the front-rear direction of the seat at the time of a rear collision, and the connecting means is extendable. The rear collision detection means configured by the bag provided in the seat back of the vehicle seat and sealed with gas or liquid is pressed by the inertial force acting on the occupant to detect the rear collision state. In such a case, since the gas or liquid in the bag is supplied to the connecting means, the connecting means is extended to press the extension portion to the rear side of the seat. There is no need to set a mechanism, and as a result, the structure of the seat cushion can be simplified, and an excellent effect can be achieved that can be reduced in size and weight. Further, in the case of the present invention, since the seat back can be rotated by an amount corresponding to the inertial force acting on the occupant at the time of the rear collision, an excellent effect that the headrest can be held at the optimum position at the time of the rear collision. Have

  According to a fourth aspect of the present invention, in the vehicle seat structure according to the second aspect of the invention, since the connecting means is constituted by a member that does not expand or contract, it corresponds to the rear displacement amount of the seat cushion at the time of the rear collision. The seat back can be rotated by the amount, and as a result, the headrest can be held at an optimal position at the time of rear collision with a simple configuration.

  According to a fifth aspect of the present invention, there is provided the vehicle seat structure according to the second aspect of the invention, wherein the connecting means is constituted by a plurality of links and is relatively moved to a guide portion provided on the seat cushion. Engageable and the other part is locked to the extension part, and the seat cushion slides to the rear side of the seat at the time of rear-end collision, so that the intersection angle of multiple links is changed by the guide part and extended Since the part is pressed, the seat back can be rotated by an amount corresponding to the rear displacement amount of the seat cushion at the time of the rear collision, and as a result, the headrest is optimally positioned at the time of the rear collision with a simple configuration. It has an excellent effect of being able to be held.

[First Embodiment]
Hereinafter, a first embodiment of a vehicle seat structure according to the present invention will be described with reference to FIG. Note that an arrow FR appropriately attached to these drawings indicates the vehicle front side, and an arrow UP indicates the vehicle upper side.

  FIG. 1 schematically shows a side view of a front seat 10 as a “vehicle seat” according to the present embodiment. As shown in this figure, the front seat 10 includes a seat cushion 12 on which an occupant is seated, a seat back 14 that is placed upright at the rear end of the seat cushion 12 and serves as a back of the occupant, and the seat back 14. And a headrest 16 that is inserted into the upper end of the vehicle so as to be adjustable in height and supports the head of the occupant.

  Further, the seat cushion 12 includes a seat cushion frame 18 that constitutes a lower portion of the seat cushion and is configured by a strength member, and a cushion portion 20 that constitutes an upper portion of the seat cushion and is mounted on the upper surface side of the seat cushion frame 18. It is configured. The seat cushion frame 18 is slidably supported by a pair of seat tracks 22 fixed to the vehicle body floor. This seat slide mechanism is used to adjust the seat position. Further, in the present embodiment, the cushion portion 20 is supported so as to be slidable in the seat front-rear direction with respect to the seat cushion frame 18. This cushion part slide mechanism is normally kept non-slidable by a lock mechanism, and the lock mechanism is released only when a load on the rear side of the vehicle of a predetermined value or more is applied at the time of a rear collision, and the seat cushion frame 18 is released. On the other hand, the cushion portion 20 is configured to be slidable by a predetermined distance toward the seat rear side.

  Further, a joint portion 26 is provided on the lower end side of the seat back 14 described above as an “extending portion” that extends downward from the reclining central shaft 24. The joint portion 26 is integrated with the seat back 14, and when the seat back 14 is tilted by the reclining mechanism, the joint portion 26 is also rotated accordingly.

  On the other hand, a connecting device 28 as “connecting means” is embedded in the cushion portion 20 of the seat cushion 12 described above. The connecting device 28 includes a connecting device 30 fixed to the seat cushion frame 18, and a straight rod shape that extends from the axial center portion of the connecting device 30 to the seat rear side and is connected to the joint portion 26 so as to be relatively rotatable. The link part 32 is comprised.

  Next, the operation and effect of this embodiment will be described.

  The state indicated by a two-dot chain line in FIG. 1 is a state during normal vehicle travel. At this time, the center of gravity of the head of the passenger P is indicated by P1, the center of gravity of the chest is indicated by P2, and the center of gravity of the waist is indicated by P3. As can be seen from this figure, during normal vehicle travel, the distance between the head (P1) of the occupant P and the headrest 16 is adequately secured, which hinders the occupant P from operating. Never do. In addition, since a special device or the like is not embedded in the seat back 14 and the headrest 16, the occupant does not feel a foreign object or a sense of incongruity during normal vehicle travel.

  On the other hand, when a rear collision occurs from this state, an inertial force acting on the occupant P toward the vehicle rear side acts. For this reason, the waist part (P3) of the occupant P is inertially moved to the rear side of the seat and is in close contact with the lower end portion of the seat back 14. That is, the center of gravity of the waist of the occupant P moves from P3 to Q3.

  The cushion portion 20 of the seat cushion 12 slides a predetermined amount toward the seat rear side (arrow A direction side) with respect to the seat cushion frame 18 in conjunction with the movement of the waist. When the cushion portion 20 slides to the rear side of the seat, the link portion 32 of the coupling device 28 also moves in the same direction by the same stroke, so that the joint portion 26 is pushed counterclockwise around the reclining central axis 24 by being pushed by the link portion 32 ( It is rotated in the direction of arrow B). For this reason, the seat back 14 and the headrest 16 as a whole rotate from the position indicated by the two-dot chain line to the position indicated by the solid line toward the seat cushion 12 (arrow C direction side), and are inclined forward.

  As described above, when the seat back 14 and the headrest 16 are inclined forward, the occupant P is supported at the position of the occupant Q by the seat back 14 and the headrest 16 in the state shown by the solid line. In other words, the relative distance between the head of the passenger and the headrest 16 is reduced (by the amount of movement of the headrest 16). As a result, according to the present embodiment, the chest P2 of the occupant P is displaced to Q2 (displacement amount = δ2) and the head P1 is displaced to Q1 (displacement amount = δ1) at the time of the rear collision, The displacement amount δ1 and the chest displacement amount δ2 are substantially equal, and the difference in the relative displacement amount of the occupant's head relative to the occupant's chest to the rear side of the seat (the relative speed difference of the occupant's head relative to the occupant's chest) is minimized. To the limit.

  Generally speaking, according to the vehicle seat structure according to the present embodiment, it is possible to effectively suppress or prevent the occupant from being whipped at the time of a rear collision without impairing the driving operation and the sitting comfort during normal traveling. Can do.

  In the vehicle seat structure according to the present embodiment, the entire seat back 14 is tilted forward at the time of a front collision, so that the entire upper body of the occupant can be firmly supported. This also contributes to the effect of reducing / preventing whiplash of the occupant at the time of rear collision.

  Further, in the vehicle seat structure according to the present embodiment, the cushion portion 20 of the seat cushion 12 is provided so as to be slidable in the front-rear direction of the seat with respect to the seat cushion frame 18, and the cushion is utilized by utilizing the inertial movement of the occupant during the rear-end collision. Since the portion 20 is slid to the rear side of the seat and the seat back 14 and the headrest 16 are rotated to the seat cushion 12 side in conjunction with the sliding operation, the connecting device 28 is simply connected to the cushion portion 20 and the seat back 14. It suffices to have only the function of connecting the joint portion 26. Therefore, according to this embodiment, the structure of the coupling device 28 can be simplified, and the size and weight can be reduced.

  In addition, since the connecting device 28 is composed of a member that does not expand and contract or bend, when the cushion portion 20 slides to the rear side of the seat by the inertial force acting on the occupant at the time of rear-end collision, the connecting device 28 also remains in the rear of the seat. The joint part 26 is pressed to the rear side of the seat. Therefore, the seat back 14 can be rotated by an amount corresponding to the amount of rearward displacement of the cushion portion 20 at the time of a rear collision. As a result, according to the present embodiment, the headrest 16 can be held at an optimal position at the time of rear collision with a simple configuration.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. Note that the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 2, the second embodiment is characterized in that the seat back 14 and the headrest 16 are rotated by a combination of a link mechanism 40 as a “connecting means” and a guide groove 42. Also in the present embodiment, the seat cushion 12 in which the cushion portion 20 is slidable with respect to the seat cushion frame 18 is used as in the first embodiment described above.

  Specifically, the seat cushion frame 18 of the seat cushion 12 is provided with a mounting seat 46 (see FIG. 3) having a hinge pin 44, and the base end portion of the first link 48 is attached to the hinge pin 44 of the mounting seat 46. The shaft is supported so as to be relatively rotatable. A proximal end portion of the second link 50 is connected to a distal end portion of the first link 48 by a guide pin 52 so as to be relatively rotatable. The distal end portion of the second link 50 is connected to the joint portion 26 of the seat back 14 by a hinge pin 54 so as to be relatively rotatable.

  Further, a guide groove 42 is formed on the side portion of the cushion portion 20 of the seat cushion 12 as a “guide portion” in which the front portion is linear and the rear portion is arcuate. In the guide groove 42, the tip end portion of the above-described guide pin 52 is slidably locked. In addition, it is preferable to attach a roller and a bearing to the front-end | tip part of the guide pin 52. FIG. The guide pin 52 is positioned near the rear end of the guide groove 42 (near the end of the arc groove) in the assembled state. In this state, the link mechanism 40 is “ Each link length is set so that it becomes a letter "".

  According to the above-described configuration, the link mechanism 40 has a “heavy” shape in a side view when the vehicle is running normally (see FIG. 3A). At this time, the guide pin 52 is positioned in the vicinity of the rear end portion of the guide groove 42.

  When the rear collision occurs from this state, the cushion portion 20 slides to the rear side of the seat by the inertial force acting on the occupant, as in the first embodiment described above. For this reason, the guide groove 42 also moves to the rear side of the seat similarly to the cushion portion 20, but the link mechanism 40 moves together with the cushion portion 20 because the first link 48 of the link mechanism 40 is fixed to the seat cushion frame 18. I can't do it. Therefore, the guide pin 52 inserted and locked in the guide groove 42 slides while descending along the arc shape of the guide groove 42, and finally the link mechanism 40 becomes substantially linear (FIG. 3). (See (B)). Thereby, the joint part 26 connected with the front-end | tip part of the 2nd link 50 is pressed to the seat back side, and the seat back 14 and the headrest 16 are rotated to the seat cushion 12 side around the reclining central axis 24.

  Therefore, also in this embodiment, the same operation and effect as the first embodiment described above can be obtained.

  Instead of the guide groove 42, for example, a channel-shaped guide rail may be set.

[Third Embodiment]
Next, a third embodiment will be described with reference to FIG. The third embodiment is a reference example that is not included in the embodiment of the present invention. Further, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 4, the third embodiment is characterized in that no slide mechanism is set in the seat cushion 12, the connecting device 60 can be expanded and contracted instead, and the pressure sensor 62 is set. is there.

  Specifically, a pressure sensor 62 is disposed at a position corresponding to the waist of the seat back 14. Further, a pressure sensor 64 having the same configuration is also disposed at a position corresponding to the leg portion (front end portion) of the cushion portion 20 of the seat cushion 12. The pressure sensors 62 and 64 are connected to a controller (not shown), and the controller is connected to a drive motor 66 of a coupling device 60 disposed in the seat cushion 12. The coupling device 60 includes a driving motor 66 whose operation is controlled by a controller, and a coupling link 68 that is coupled to the driving motor 66 via a speed reduction mechanism (not shown) and that expands and contracts in the axial direction by receiving a driving force. Has been. A rack and pinion mechanism may be used, or a feed screw system may be used.

  According to the above configuration, the coupling device 60 is held in a non-operating state (a state where the coupling link 68 is contracted) in a state during normal vehicle travel.

  When a rear collision occurs from this state, the occupant tends to move toward the rear side of the vehicle with inertial force. For this reason, the occupant's waist moves to the seat rear side and presses the pressure sensor 62 on the seat back 14 side, and the occupant's leg moves to the seat rear side and presses the pressure sensor 64 on the seat cushion 12 side. Signals detected by the pressure sensors 62 and 64 are output to the controller, and the controller calculates the amount of movement of the occupant based on the detection signals and outputs a corresponding drive signal to the drive motor 66 of the coupling device 28. In response to this, the drive motor 66 is driven at a predetermined rotational speed or for a predetermined time, and the connecting link 68 is extended. Thereby, the joint part 26 connected with the front-end | tip part of the connection link 68 is pressed to the seat back side, and the seat back 14 and the headrest 16 are rotated to the seat cushion 12 side around the reclining central axis 24.

  Therefore, in this embodiment as well, as in the first and second embodiments described above, it is possible to effectively prevent the occupant from whipping at the time of a rear collision without impairing the driving operation and sitting comfort during normal driving. It can be suppressed or prevented.

  Further, in the vehicle seat structure according to the present embodiment, the cushion portion 20 of the seat cushion 12 is provided so as not to be slidable in the seat front-rear direction with respect to the seat cushion frame 18, so that the cushion of the seat cushion 12 during a rear-end collision is provided. The portion 20 does not slide to the rear side of the seat, but instead, the connecting device 60 can be expanded and contracted, and when the rearward collision state is detected by the pressure sensors 62 and 64, the connecting device 60 is extended to expand the seat. Since the back 14 and the headrest 16 are rotated to the seat cushion 12 side, it is not necessary to set a slide mechanism for a rear collision in the seat cushion 12 as in the first and second embodiments described above. . Therefore, according to the present embodiment, the structure of the seat cushion 12 can be simplified, and the size and weight can be reduced.

  In addition, in the vehicle seat structure according to the present embodiment, small pressure sensors 62 and 64 are provided at positions corresponding to the waist of the seat back 14 and positions corresponding to the legs of the cushion portion 20 of the seat cushion 12, and these pressure sensors 62 are provided. 64, the rearward collision state is detected so that the connecting device 60 is extended. Therefore, the system can be easily established in terms of space. Therefore, vehicle mountability is good.

  In the present embodiment, the pressure sensors 62 and 64 are provided at two locations, but a configuration in which the pressure detection means is installed only in one of the two may be adopted. In this case, it is preferable to set the pressure sensor 62 on the seat back 14 side.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 5, in the fourth embodiment, no sliding mechanism is set for the seat cushion 12, and instead, the connecting device 70 as “connecting means” can be expanded and contracted, and “rear collision detection” is performed. As a means, a feature is that a bag 72 in which air or liquid is enclosed is set in the seat back 14.

  Specifically, a bag 72 having a predetermined capacity is embedded in a position corresponding to the waist of the seat back 14. Gas or liquid is sealed in the bag 72, and in a normal state, the position corresponding to the waist of the occupant is inflated most in accordance with the shape of the front surface of the seat back 14.

  On the other hand, the connecting device 70 is erected from a cylinder 74 arranged with the axial direction as the seat longitudinal direction, a piston 76 accommodated in the cylinder 74 so as to be movable in the axial direction, and a shaft core portion of the piston 76. And a rod 78. The distal end portion of the rod 78 is connected to the joint portion 26 provided on the lower end side of the seat back 14 so as to be relatively rotatable. Further, the inside of the cylinder 74 is separated by a piston 76, thereby forming a cylinder chamber 80 filled with gas or liquid.

  One end of a pipe 82 (or a hose) is connected to the lower end of the bag 72 described above. The other end of the pipe 82 is connected to the bottom of the cylinder 74 (that is, the cylinder chamber 80). Therefore, the gas or liquid in the bag 72 can move in the pipe according to the pressure acting on the bag 72 and can be supplied into the cylinder chamber 80. A valve may be set as appropriate.

  According to the above configuration, the coupling device 70 is maintained in a non-operating state (a state in which the cylinder chamber 80 is reduced) in a state during normal vehicle travel.

  When a rear collision occurs from this state, the occupant tends to move toward the rear side of the vehicle with inertial force. For this reason, a passenger | crew's waist | hip | lumbar part moves to the back side of a sheet | seat, and the bag 72 embed | buried in the seat back 14 is pressed. For this reason, the gas or liquid sealed in the bag 72 is supplied to the cylinder chamber 80 via the pipe 82. As a result, the piston 76 moves to the right side in the drawing, the joint portion 26 connected to the tip end portion of the rod 78 is pressed to the rear side of the seat, and the seat back 14 and the headrest 16 are moved around the reclining central axis 24 on the seat cushion 12 side. Turn to.

  Therefore, in this embodiment as well, as in the first and second embodiments described above, it is possible to effectively prevent the occupant from whipping at the time of a rear collision without impairing the driving operation and sitting comfort during normal driving. It can be suppressed or prevented.

  Further, in the vehicle seat structure according to the present embodiment, the cushion portion 20 of the seat cushion 12 is provided so as not to be slidable in the seat front-rear direction with respect to the seat cushion frame 18, so that the cushion of the seat cushion 12 during a rear-end collision is provided. The portion 20 does not slide to the rear side of the seat, but instead, the connecting device 70 can be expanded and contracted, and when the rearward collision state is detected by the bag 72, the connecting device 70 is extended to extend the seat back 14 and Since the headrest 16 is rotated to the seat cushion 12 side, it is not necessary to set a slide mechanism for rear collision in the seat cushion 12 as in the first and second embodiments described above. Therefore, according to the present embodiment, the structure of the seat cushion 12 can be simplified, and the size and weight can be reduced.

  In addition, in the vehicle seat structure according to the present embodiment, an amount corresponding to the inertial force acting on the occupant at the time of a rear collision is obtained by embedding a bag 72 in which gas or liquid is sealed in a position corresponding to the waist of the seat back 14. Since only the gas or liquid is supplied to the cylinder chamber 80, the seat back 14 can be rotated according to the amount of inertia acting on the occupant at the time of the rear collision, and as a result, the headrest 16 is brought to an optimal position at the time of the rear collision. Can be held.

[Supplementary explanation of the embodiment]
In each of the first and second embodiments described above, the cushion portion 20 of the seat cushion 12 is configured to be slidable with respect to the seat cushion frame 18. You may take the structure which slides the cushion part 20 to a seat back side with respect to the seat cushion frame 18 at the time of a collision. For example, when a load greater than or equal to a predetermined value is applied to the seat slide locking mechanism, the shear pin or the like may be sheared to release the locking mechanism, and the entire seat may be slid backward by a predetermined distance. Alternatively, the seat slide locking mechanism is configured by a solenoid, and when a load of a predetermined value or more is applied to the seat back or the like, the solenoid is turned on or off by the controller, the plunger is retracted into the solenoid, and the locking mechanism is You may comprise so that it may be cancelled | released.

  In each of the above-described embodiments, the front seat 10 has been described as an example. However, in the case of a three-row seat vehicle, the present invention can be applied to a second seat.

It is a side view showing the whole composition of the vehicular seat structure concerning a 1st embodiment. It is a side view which shows the whole structure of the vehicle seat structure which concerns on 2nd Embodiment. It is explanatory drawing for demonstrating the action | operation of the link mechanism shown by FIG. It is a side view which shows the whole structure of the vehicle seat structure which concerns on 3rd Embodiment. It is a side view which shows the whole structure of the vehicle seat structure which concerns on 4th Embodiment. It is a schematic side view which shows the whole structure of the vehicle seat structure which concerns on a 1st prior art example. It is a schematic side view which shows the whole structure of the vehicle seat structure which concerns on a 2nd prior art example. It is a schematic side view which shows the whole structure of the vehicle seat structure which concerns on a 3rd prior art example.

Explanation of symbols

10 Front seat (vehicle seat)
12 Seat cushion 14 Seat back 16 Headrest 24 Reclining central axis 26 Joint part (extension part)
28 Connecting device (connecting means)
40 Link mechanism (connecting means)
42 Guide groove (guide part, connecting means)
52 guide pins (connection means)
70 connecting device (connecting means)
72 bags (rear collision detection means)

Claims (5)

A seat cushion on which an occupant is seated, a seat back that is disposed upright at the rear end of the seat cushion and that can be tilted about a reclining central axis, and an occupant's head that is disposed at the upper end of the seat back A vehicle seat structure including a headrest that supports a portion,
An extending portion provided on the lower end side of the seat back and extending downward from the reclining central axis;
A connecting means provided in the seat cushion and connected to the extending portion, and pressing the extending portion to the seat rear side by an inertial force acting on an occupant at the time of a rear collision;
A vehicle seat structure comprising: Only the seat cushion is provided so as to be slidable in the front-rear direction of the seat at the time of a rear collision and slides to the rear side of the seat by an inertial force acting on the occupant at the time of the rear collision,
The connecting means presses the extending portion to the seat rear side in conjunction with a sliding operation of the seat cushion to the seat rear side.
The vehicle seat structure according to claim 1. The seat cushion is provided so as not to slide in the front-rear direction of the seat at the time of a rear collision, and the connecting means is extendable,
When the rear collision state is detected by the rear collision detection means configured by the bag provided in the seat back of the vehicle seat and filled with gas or liquid being pressed by the inertial force acting on the occupant. The gas or liquid in the bag is supplied to the connecting means, so that the connecting means is extended and presses the extending portion to the seat rear side.
The vehicle seat structure according to claim 1. The connecting means is constituted by a member that does not expand or contract,
The vehicle seat structure according to claim 2. The connecting means is constituted by a plurality of links, and a part thereof is engaged with a guide part provided on the seat cushion so as to be relatively movable, and the other part is engaged with the extension part. ,
By sliding the seat cushion toward the rear side of the seat at the time of a rear collision, the crossing angle of the plurality of links is changed by the guide portion, and the extending portion is pressed.
The vehicle seat structure according to claim 2.

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