JP2007106377A - Supporting structure of seat for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supporting structure of a seat for a vehicle capable of suppressing rearward inclination of a seat back at rear end-collision of the vehicle. <P>SOLUTION: In the supporting structure 10 of the seat for the vehicle, the seat 12 for the vehicle connected with the seat back 16 to a rear end side of a seat cushion 14 for sitting an occupant supported on a seat slide 24 at a vehicle body side. A lower arm 20 of the seat cushion 14 and an upper arm 28 of the seat slide 24 are connected to each other through front and rear link members 30, 32 and when rearward load of a predetermined value or more of the seat 12 for the vehicle is applied, a front part 14A is downwardly displaced relative to a rear part 14B by angular displacement of the link members 30, 32 while the seat cushion 14 is retreated and the seat back 16 is forwardly inclined. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a support structure for a vehicle seat mounted on a vehicle such as an automobile.

In a vehicle seat, a technology is known in which a headrest is tilted forward by a rear impact load to prevent a passenger from whipping at the time of a rear impact of the vehicle (see, for example, Patent Document 1).
JP 2003-191778 A JP 2001-163097 A Japanese Patent Laid-Open No. 2001-239871 JP-A-10-287164

  However, the conventional technology as described above has a problem in that the seat back that supports the headrest tilts backward due to the rear impact load that is input from the lower back of the occupant to the lower portion of the seat back.

  In view of the above fact, an object of the present invention is to provide a vehicle seat support structure that can suppress the rearward tilt of the seatback at the time of a vehicle rear-end collision.

  In order to achieve the above object, a vehicle seat support structure according to the first aspect of the present invention is a vehicle seat support structure in which a seat back is connected to a rear end side of a seat cushion for a passenger to sit on. And a height changing means for displacing the front portion of the seat cushion in the longitudinal direction of the vehicle body relative to the rear portion by a load greater than or equal to a predetermined value acting in the backward direction of the vehicle body.

  2. The vehicle seat support structure according to claim 1, wherein, for example, when a rearward load of a predetermined value or more is applied during a vehicle rear-end collision, the front portion of the seat cushion is relatively lower than the rear portion of the seat cushion. It is displaced to. Thereby, the seat back connected to the rear end side of the seat cushion is displaced in the forward tilt direction, and the rear tilt due to the backward pressing force from the occupant (seater) upper body at the time of a rear collision or the like is suppressed ( The amount of backward tilt is reduced).

  Thus, in the vehicle seat support structure according to the first aspect, it is possible to suppress the rearward inclination of the seat back at the time of the vehicle rearward collision.

  In order to achieve the above object, a vehicle seat support structure according to a second aspect of the present invention is a vehicle seat support structure in which a seat back is connected to a rear end side of a seat cushion for a passenger to sit on. Thus, there is provided height changing means for displacing the rear part of the seat cushion in the vehicle longitudinal direction relative to the front part by a load of a predetermined value or more acting backward in the vehicle longitudinal direction.

  In the vehicle seat support structure according to claim 2, for example, when a rearward load of a predetermined value or more is applied at the time of rearward collision of the vehicle, the rear portion of the seat cushion is relatively upward with respect to the front portion of the seat cushion. Displace. Thereby, the seat back connected to the rear end side of the seat cushion is displaced in the forward tilt direction, and the rear tilt due to the backward pressing force from the occupant (seater) upper body at the time of a rear collision or the like is suppressed ( The amount of backward tilt is reduced).

  Thus, in the vehicle seat support structure according to the second aspect, it is possible to suppress the rearward inclination of the seat back at the time of the vehicle rearward collision.

  A vehicle seat support structure according to a third aspect of the present invention is the vehicle seat support structure according to the first or second aspect, wherein the height changing means is a rear side of the seat cushion in the longitudinal direction of the vehicle body. And a front link member that connects the front portion of the seat cushion and the vehicle body so as to tilt backward as the vehicle moves toward the vehicle.

  In the vehicle seat support structure according to claim 3, the front link member connects the vehicle body and the front portion of the seat cushion in a substantially upright state, for example, and the seat cushion is displaced rearward by a backward moving force. Accordingly, by tilting backward, the front portion of the seat cushion is displaced downward relative to the rear portion. Further, as described above, the seat cushion, that is, the entire vehicle seat moves backward while the front portion of the seat cushion is displaced downward relative to the rear portion and the seat back is tilted forward by a rearward load (rear impact load or the like). Therefore, in other words, since a part of the backward load (energy) is consumed for the backward movement of the seat, the backward inclination of the seat back can be effectively suppressed.

  A vehicle seat support structure according to a fourth aspect of the present invention is the vehicle seat support structure according to any one of the first to third aspects, wherein the height changing means is a vehicle body of the seat cushion. A rear link member that connects the rear portion of the seat cushion and the vehicle body so as to rotate in a direction standing upright from the forward tilted state in accordance with the rearward movement in the front-rear direction is configured.

  In the vehicle seat support structure according to claim 4, the rear link member connects, for example, the vehicle body and the rear portion of the seat cushion in a forwardly inclined state, and the seat cushion is displaced backward by a backward moving force. Accordingly, the rear part of the seat cushion is displaced upward relative to the front part by being displaced upright, that is, tilted backward. Further, as described above, the seat cushion, that is, the entire vehicle seat moves backward while the seat back is tilted forward by displacing the rear portion of the seat cushion upward with respect to the rear portion by a rearward load (rear impact load, etc.) In other words, since a part of the backward load (energy) is consumed for the backward movement of the seat, the backward tilt of the seat back can be effectively suppressed.

  A vehicle seat support structure according to a fifth aspect of the present invention is the vehicle seat support structure according to the third or fourth aspect, wherein the height changing means is provided by the front link member or the rear link member. A stopper for limiting the rotation angle is further provided.

  In the vehicle seat support structure according to claim 5, when the seat back is tilted forward while the seat cushion moves backward by a predetermined amount, the stopper prevents further displacement. Thereby, after suppressing the backward inclination of the seat back, the vehicle seat can be fixed at an appropriate position with respect to the vehicle body.

  The vehicle seat support structure according to a sixth aspect of the present invention is the vehicle seat support structure according to the fifth aspect, wherein the stopper also serves as an energy absorbing member that is plastically deformed as the link member rotates. .

  In the vehicle seat support structure according to the sixth aspect, as the seat cushion moves rearward by a predetermined amount, the stopper also serving as the energy absorbing member is plastically deformed to achieve energy absorption. Since the stopper also serves as an energy absorbing member, it is possible to perform an energy absorbing function associated with a vehicle rear-end collision without increasing the number of parts.

  As described above, the vehicle seat support structure according to the present invention has an excellent effect that the rearward inclination of the seatback can be suppressed at the time of a vehicle rearward collision.

  In addition, in the vehicle seat support structure 10, the change (forward tilt) of the seat back 16 to respond to the rear collision is performed by the displacement of the seat cushion 14 in the direction of the arrow C. A configuration in which the adjustment of the tilt angle and a change in the tilt angle of the seat back 16 for dealing with a rear collision are made compatible, or a configuration in which the headrest is displaced relative to the seat back mechanically by a pressing force acting on the seat back. Thus, it is not necessary to adopt a complicated structure or a structure with an increase in weight (a structure that raises the center of gravity of the vehicle body), and the whipping of the occupant P can be effectively suppressed with a simple configuration.

  A vehicle seat support structure 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. It should be noted that arrows FR and UP appropriately shown in the drawings respectively indicate the forward direction (traveling direction) and the upward direction of the automobile to which the vehicle seat support structure 10 is applied.

  FIG. 1 is a side view of a vehicle seat 12 disposed in a vehicle cabin. As shown in this figure, the vehicle seat 12 has a lower end of a seat back 16 connected to a rear end portion of a seat cushion (seat mat) 14 for an automobile occupant to sit through a recliner (reclining device) 15. Has been configured. The recliner 15 is configured to be able to adjust the inclination angle of the seat back 16 with respect to the seat cushion 14. A headrest 18 for supporting the head of the occupant is disposed above the seat back 16 in the vehicle seat 12.

  The seat cushion 14 includes a lower arm (also referred to as a seat cushion frame) 20, and a cushion material 22 is supported on the lower arm 20. The recliner 15 is connected to the rear end of the lower arm 20. In the vehicle seat support structure 10, the lower arm 20 is connected to and supported by the seat slide 24 via front and rear link members 30 and 32 described later.

  The seat slide 24 includes a lower rail 26 fixed on the vehicle floor and an upper rail 28 guided by the lower rail 26 so as to be slidable in the front-rear direction, and is used for adjusting the front-rear position of the vehicle seat 12. Yes. The lower arm 20 is connected to an upper rail 28 positioned below the lower arm 20 via a front link member 30 and a rear link member 32.

  As shown in FIG. 2A, the front link member 30 is connected to the front portion 20A of the lower arm 20 so that the upper end of the front link member 30 is rotatable around the link shaft 30A by a link shaft (link pin) 30A. The lower end is connected to the front portion 28A of the upper rail 28 by a link shaft 30B so as to be rotatable around the link shaft 30B.

  The rear link member 32 is connected to the rear portion 20B of the lower arm 20 so that the upper end of the rear link member 32 can be rotated about the link shaft 32A by the link shaft 32A, and the lower end of the rear side link member 32 is about the link shaft 32B by the link shaft 32B. The upper rail 28 is rotatably connected to the rear portion 28B.

  As described above, in the vehicle seat support structure 10, the upper rail 28, the front side link member 30, the lower arm 20, and the rear side link member 32 constitute a four-bar link 34 having the upper rail 28 as a fixed link. The posture including the front and rear position of the lower arm 20 can be changed. The four-joint link 34 including the front link member 30 and the rear link member 32 may constitute a mechanism unit such as seat cushion height adjustment, seat angle adjustment, and front-rear position fine adjustment. In this case, the synchronized rotation position of the front link member 30 and the rear link member 32 is maintained steplessly or stepwise.

  In the vehicle seat support structure 10, when the lower arm 20 (seat cushion 14) is moved to the rearward movement limit described later, the front portion 20 </ b> A (link shaft 30 </ b> A) of the lower arm 20 becomes the lowest position and the lower arm 20. The front link member 30 and the rear link member 32 connect the lower arm 20 and the upper rail 28 so that the rear portion 20B (link shaft 32A) is at the highest position (a four-bar link 34 is set). .

  Specifically, the front side link member 30 is upright (slightly forward tilted in FIG. 2 (A)) in a normal position (such as the neutral position of the adjusting mechanism) in a substantially vertical direction, and is about the link shaft 30B. When the lower arm 20 is moved to the rear movement limit as shown in FIG. 2B by rotating in the direction of arrow A, the front portion 20A of the lower arm 20 is displaced downward with respect to the normal position.

  On the other hand, the rear link member 32 is tilted forward at a normal position (such as the neutral position of the adjusting mechanism), and rotates in the direction of arrow B around the link shaft 32B to lower arm as shown in FIG. When 20 is moved to the rear side movement limit, the rear portion 20B of the lower arm 20 is displaced upward with respect to the normal position. The rear link member 32 is set to be substantially upright (slightly forward tilted in FIG. 2B) in a state where the lower arm 20 is positioned at the rear movement limit.

  Therefore, when the seat cushion 14 as a whole reaches the rearward movement limit shown in FIG. 2B from the normal position shown in FIG. 2A, the front portion 14A is displaced relatively downward with respect to the rear portion 14B. In other words, the rear portion 14B is displaced upward relative to the front portion 14A, and the seat surface 14C as a whole rotates in the forward tilt direction (the direction of arrow C shown in FIG. 2B). As the seat cushion 14 rotates in the direction of arrow C, the seat back 16 connected to the rear end side of the seat cushion 14 approaches an upright state along the vertical direction as shown in FIG. As you can see, it leans forward (stands up).

  The front link member 30 and the rear link member 32 described above correspond to the “height changing means” in the present invention, respectively, and the four-bar link 34 that combines the front link member 30 and the rear link member 32 is “ It can also be understood that it corresponds to “height changing means”.

  The vehicle seat support structure 10 includes a holding member 36 for holding the four-bar link 34 in the normal position shown in FIG. In this embodiment, the holding member 36 connects the upper rail 28 that is a fixed link (vehicle body side member) and a portion other than the link shaft 32B of the rear link member 32 to restrict the operation of the four-bar link 34. Yes.

  Specifically, as shown in FIG. 2A, a locking portion 32C is extended from the upper end of the rear link member 32, and the locking portion 32C and the intermediate portion 28C in the front-rear direction of the upper rail 28 are provided. Are connected by a holding member 36. The holding member 36 is formed in a wave shape in a side view, and is configured to plastically deform and extend in a substantially linear shape in a side view as shown in FIG. 2B when a tension of a predetermined value or more is applied. .

  Therefore, the state in which the holding member 36 is fully extended and the rotation of the rear link member 32 beyond that in the arrow B direction is prevented (the state in which the operation of the four-bar link 34 is restricted) is the lower arm 20. Is located in the rear movement limit. That is, the holding member 36 corresponds to the “stopper” and “energy absorbing member” in the present invention. In the case where the four-joint link 34 constitutes the various adjustment mechanisms described above, for example, it is set so that various adjustments can be performed within the elastic deformation range of the holding member 36.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 3 (A), the vehicle seat 12 supported by the vehicle seat support structure 10 having the above-described configuration is seated on the vehicle passenger's seat P in the normal position. To do. When a rear collision occurs in the automobile, a pressing force F is applied to the vehicle seat 12 so that the occupant's waist L mainly presses the lower portion of the seat back 16 backward as shown in FIG.

  When the pressing force F is equal to or greater than a predetermined value capable of plastically deforming the holding member 36, the seat cushion 14 (lower arm 20) rotates the front and rear link members 30 and 32 in the directions of arrow A and arrow B, respectively. In other words, it moves backward while rotating in the direction of arrow C by itself. At this time, the holding member 36 absorbs the impact energy accompanying the rear collision while being plastically deformed.

  Therefore, the vehicle seat 12 is rotated in the direction of arrow C as a whole by the pressing force F from the occupant P, so that the seat back 16 is tilted forward (see arrow C) as shown in FIG. 18 approaches the rear of the head H of the occupant P in a short time (early) from the rear impact.

  As described above, in the vehicle seat support structure 10 according to the first embodiment, the rearward inclination of the seat back 16 can be suppressed at the time of a vehicle rearward collision.

  This will be further explained by comparison with a comparative example shown in FIG. In addition, the same code | symbol is attached | subjected to the structure similar to this embodiment in a comparative example, and description is abbreviate | omitted. In the vehicle seat 70 according to the comparative example, the recliner 15 is deformed by the pressing force F acting on the seat back 16 when the automobile shown in FIG. As a result, the seat back 16 tilts backward (see arrow D). For this reason, the headrest 18 provided at the upper end of the seat back 16 is separated from the head H of the occupant P, causing whipping.

  On the other hand, the vehicle seat 12 supported on the vehicle body by the vehicle seat support structure 10 according to the first embodiment is configured such that the seat back 16 is seated by the pressing force F generated by the rear impact as described above. Together with the cushion 14, the headrest 18 approaches the head H of the occupant P. Thereby, in the vehicle seat support structure 10 according to the first embodiment, the whipping of the occupant P is effectively suppressed.

  Further, in the vehicle seat support structure 10, the front and rear link members 30 and 32 are arranged non-parallel to each other so that the seat cushion 14 rotates backward in the direction of arrow C (the seat back 16 is tilted forward). Therefore, a configuration has been realized in which impact energy is consumed by plastically deforming the holding member 36 using the retreat stroke.

  Thereby, compared with the comparative example, the pressing force input from the waist L of the occupant P to the seat back 16 is reduced, and the deformation of the recliner 15 is suppressed. In this embodiment, a configuration is realized in which the forward tilt angle of the seat back 16 due to the rotation of the seat cushion 14 in the direction of the arrow C is larger than the backward tilt angle of the seat back 16 due to the deformation of the recliner 15. In the event of a rear-end collision, the headrest 18 approaches the head H of the occupant P with certainty.

  Further, in the vehicle seat support structure 10, the holding member 36 functions as a stopper that defines the rearward movement limit of the seat cushion 14, so that the vehicle seat 12 is suitable for the vehicle body after the impact energy is absorbed. It is held fixed in position. Since the holding member 36 performs the stopper function and the energy absorbing function, that is, the holding member 36 serves as both the stopper and the energy absorbing member, the above functions can be performed without increasing the number of parts.

  In addition, in the vehicle seat support structure 10, the change (forward tilt) of the seat back 16 to respond to the rear collision is performed by the displacement of the seat cushion 14 in the direction of the arrow C. A configuration in which the adjustment of the tilt angle and a change in the tilt angle of the seat back 16 for dealing with a rear collision are made compatible, or a configuration in which the headrest is displaced relative to the seat back mechanically by a pressing force acting on the seat back. Thus, it is not necessary to adopt a complicated structure or a structure with an increase in weight (a structure that raises the center of gravity of the vehicle body), and the whipping of the occupant P can be effectively suppressed with a simple configuration.

  Next, a second embodiment of the present invention will be described. Note that components and portions that are basically the same as those in the first embodiment mobile phone are denoted by the same reference numerals as those in the second embodiment, and description thereof may be omitted, and illustration may be omitted.

  FIG. 4 shows a side view of the vehicle seat support structure 50 according to the second embodiment. As shown in this figure, a seat lifter 52 is disposed between the lower arm 20 of the vehicle seat 12 and the upper rail 28 on the vehicle body side. That is, in this embodiment, the four-bar link 34 constitutes the seat lifter 52. This will be specifically described below.

  The four-bar link 34 constituting the seat lifter 52 includes a front link member 54 and a rear link member 56 instead of the front link member 30 and the rear link member 32. The front link member 54 is connected to the front portion 20A of the lower arm 20 so that the upper end of the front link member 54 can be rotated about the link shaft 54A by the link shaft 54A, and the lower end of the front side link member 54 is rotated about the link shaft 54B by the link shaft 54B. It is connected to the front portion 28A of the upper rail 28 as possible.

  The rear link member 56 is connected to the rear portion 20B of the lower arm 20 so that the upper end of the rear link member 56 is rotatable about the link shaft 56A by the link shaft 56A, and the lower end of the rear side link member 56 is about the link shaft 56B by the link shaft 56B. The upper rail 28 is rotatably connected to the rear portion 28B. The rear link member 56 has an upper and lower link shaft distance (arm length) larger than the upper and lower link shaft distances of the front link member 54.

  As a result, in the seat lifter 52 in which the front and rear link members 54 and 56 are arranged substantially in parallel, the lower arm 20 moves to the rear movement limit side, so that the rear link member 56 approaches an upright state as shown in FIG. 14A, the front portion 14A is displaced downward relative to the rear portion 14B. In other words, the rear portion 14B is displaced upward relative to the front portion 14A, and the seat surface as a whole. The structure which 14C rotates in the arrow C direction is implement | achieved.

  The seat lifter 52 includes a lifter knob 58, a first intermediate gear 60, and a second intermediate gear 62 that are rotatably supported by the lower arm 20, respectively. The lifter knob 58 is configured such that an operation portion 58A rotated by an occupant and a pinion 58B are fixedly connected so as to rotate coaxially and integrally.

  The first intermediate gear 60 is configured such that the gear portion 60A meshed with the pinion 58B of the lifter knob 58 and the pinion 60B are fixedly connected so as to rotate coaxially and integrally. The second intermediate gear 62 is configured to be fixedly connected so that the gear portion 62A formed in a substantially fan shape and meshed with the gear portion 60A of the first intermediate gear 60 and the link portion 62B rotate coaxially and integrally. Has been.

  Thus, in the seat lifter 52, when the occupant rotates the operation portion 58A of the lifter knob 58, this rotation is performed via the pinion 58B, the gear portion 60A of the first intermediate gear 60 and the pinion 60B, and the gear portion 62A of the second intermediate gear 62. The link portion 62B is configured such that the upper end of the link portion 62B swings substantially in the front-rear direction according to the operation direction of the operation portion 58A (see arrow E).

  And the upper end of the link part 62B and the latching | locking part 56C extended from the upper end of the rear side link member 56 are connected with the connection link 64 via the link pins 64A and 64B, respectively. Thereby, the swing in the direction of arrow E of the upper end (link pin 64A) of the link portion 62B is transmitted to the rear link member 56, and the seat surface height of the seat cushion 14 can be changed within a predetermined range. The seat surface height when not operated is held by friction between each gear and the pinion.

  An energy absorbing portion 64C is formed at the intermediate portion in the longitudinal direction of the connecting link 64 by bending or the like. The energy absorbing portion 64 </ b> C is plastically deformed and stretched when a longitudinal tensile force of a predetermined value or more acts on the connecting link 64. The predetermined value of the tensile force is sufficiently large with respect to the tensile force that acts on the connecting link 64 during normal operation of the seat lifter 52.

  As described above, in the vehicle seat support structure 50, for example, when a pressing force F of a predetermined value or more acts on the lower portion of the seatback 16 from the waist L of the occupant P at the time of rearward collision of the vehicle, the energy absorbing portion 64 </ b> C of the connection link 64 is plasticized. While being deformed, the rear link member 56 rotates in the arrow B direction and the front link member 54 rotates in the arrow A direction, whereby the seat cushion 14, that is, the vehicle seat 12 as a whole rotates in the arrow C direction. Thus, the seat back 16 is inclined forward.

  That is, the front link member 54 and the rear link member 56 each correspond to the “height changing means” in the present invention, and the four-bar link 34 combining the front link member 54 and the rear link member 56 is “high”. It is also possible to grasp that it corresponds to the “changing means”. The connecting link 64 corresponds to the “stopper” and “energy absorbing member” in the present invention.

  Therefore, the vehicle seat support structure 50 according to the second embodiment also provides the same operational effects as the first embodiment. That is, in the vehicle seat support structure 50 according to the second embodiment, it is possible to suppress the rearward tilt of the seatback 16 when the vehicle is rearwardly impacted.

  Further, in the vehicle seat support structure 50, the normal position (including dimensions and shape) of the front and rear link members 54 and 56 is changed with respect to the existing seat lifter, and the connection link 64 in which the energy absorbing portion 64C is set is used. In other words, in other words, the seat lifter 52 having the above-described effects can be configured without increasing the number of parts, the number of assembling steps, and the weight of the entire vehicle seat 12.

  In each of the above embodiments, the example in which the front and rear link members 30 and 32 or the front and rear link members 54 and 56 that connect the lower arm 20 and the upper rail 28 are provided is shown, but the present invention is not limited to this. For example, you may comprise so that the front part of the seat cushion 14 may be displaced to a lower side relatively with respect to a rear part by either one of the front and rear link members.

  Moreover, in each said embodiment, although the example which comprised the height change means in this invention by the front and rear link members 30 and 32 or the front and rear link members 54 and 56 was shown, this invention is not limited to this, For example, A cam provided on the rear end side of the lower arm 20 may be fitted in a cam groove that is provided on the upper rail and becomes higher toward the rear side so that the seat cushion 14 tilts forward as it moves backward.

1 is a side view showing a schematic overall configuration of a vehicle seat support structure according to a first embodiment of the present invention. It is a figure which expands and shows the principal part of the support structure of the vehicle seat which concerns on the 1st Embodiment of this invention, Comprising: (A) is a side view of a normal state, (B) is the displacement state at the time of vehicle rear collision FIG. It is a figure which shows the seating state of the vehicle seat to which the support structure of the vehicle seat which concerns on the 1st Embodiment of this invention was applied, Comprising: (A) is a side view of a normal state, (B) is a vehicle rear collision. It is a side view which shows the displacement state at the time. It is a side view which expands and shows the principal part of the support structure of the vehicle seat which concerns on the 2nd Embodiment of this invention. It is a figure which shows the seating state of the vehicle seat which concerns on the comparative example with embodiment of this invention, Comprising: (A) is a side view of a normal state, (B) is a side view which shows the deformation | transformation state at the time of vehicle rear collision. is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle seat support structure 12 Vehicle seat 14 Seat cushion 16 Seat back 28 Upper rail (vehicle body)
30 Front link member (height change means)
32 Rear link member (height changing means)
34 4 links (height change means)
36 Holding member (stopper, energy absorbing member)
50 Vehicle seat support structure 52 Seat lifter (height changing means)
54 Front link member (height change means)
56 Rear link member (height changing means)
64 Link (stopper, energy absorbing member)

Claims (6)

A vehicle seat support structure in which a seat back is connected to a rear end side of a seat cushion for a passenger to sit on,
Support for a vehicle seat provided with a height changing means for displacing the front part of the seat cushion in the longitudinal direction of the vehicle body relative to the rear part by a load greater than a predetermined value acting in the backward direction of the vehicle body Construction. A vehicle seat support structure in which a seat back is connected to a rear end side of a seat cushion for a passenger to sit on,
A vehicle seat support structure comprising height changing means for displacing the rear part of the seat cushion in the vehicle longitudinal direction relative to the front by a load greater than or equal to a predetermined value acting backward in the vehicle longitudinal direction .   The height changing means is configured to include a front link member that connects the front portion of the seat cushion and the vehicle body so as to tilt backward as the seat cushion moves rearward in the vehicle longitudinal direction. The vehicle seat support structure according to claim 1 or 2.   The height changing means includes a rear link that connects the rear portion of the seat cushion and the vehicle body so that the seat cushion rotates in a direction erecting from the forward tilted state as the seat cushion moves rearward in the vehicle longitudinal direction. The vehicle seat support structure according to any one of claims 1 to 3, comprising a member.   5. The vehicle seat support structure according to claim 3, wherein the height changing unit further includes a stopper that limits a rotation angle of the front link member or the rear link member.   The vehicle seat support structure according to claim 5, wherein the stopper also serves as an energy absorbing member that is plastically deformed as the front link member or the rear link member rotates.

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