JP5034699B2 - Vehicle lower structure - Google Patents

Description

  The present invention relates to a vehicle lower structure in a vehicle in which a battery is mounted on a floor portion of a luggage room.

In a vehicle such as a hybrid vehicle, a battery may be mounted on the rear floor of the luggage room (see, for example, Patent Document 1). In such a vehicle, for example, when a large vehicle traveling at high speed has a rear collision (rear collision), the battery is displaced to the front side of the vehicle. There is a risk of impact on the back.
JP-A-2005-247063

  In consideration of the above-described facts, the present invention provides a vehicle lower structure that can suppress or prevent an impact from being applied to a seat back even when a battery is displaced to the front side of the vehicle due to a rear collision of a high-speed traveling vehicle. The task is to do.

  The vehicle lower structure according to the first aspect of the present invention includes a first floor portion constituting a bottom portion of a luggage room, a battery mounted on the first floor portion, and a cabin on the vehicle front side of the first floor portion. A second floor portion that constitutes the bottom of the vehicle and a part of the vehicle seat, and a rear end portion is disposed adjacent to the lower end portion of the seat back on the vehicle front side of the battery, and is used for passenger seating, A vehicle upper side of the second floor portion when the battery is displaced forward from the normal position where there is no space where the battery can enter on the vehicle upper side of the second floor portion and on the seat lower side. And a lower part of the seat provided with a seat cushion movable to the raised position where the battery enters, on the lower side of the seat.

  According to the vehicle lower structure of the present invention described in claim 1, the seat cushion at the lower part of the seat is a space in which a battery can enter the vehicle on the upper side of the second floor portion constituting the bottom of the cabin and on the lower side of the seat. When the battery is displaced from the normal position to the front side of the vehicle due to a collision, the battery can move to the raised position where the battery has entered the second floor portion above the vehicle and below the seat. For this reason, during normal times (except when the battery is displaced forward of the vehicle due to a collision), the seat cushion is disposed at the normal position, and the height of the seating position is suppressed. On the other hand, when the battery is displaced forward due to the collision, the seat cushion is disposed at the raised position and the battery enters the vehicle upper side and the seat lower side of the second floor portion. The load on the back is suppressed.

  A vehicle lower structure according to a second aspect of the present invention is the vehicle lower structure according to the first aspect, wherein an inclined portion that is inclined toward the vehicle lower side toward the front of the vehicle is formed at a front portion of the battery in the vehicle front-rear direction. It is characterized by.

  According to the vehicle lower structure of the present invention described in claim 2, the front portion of the battery in the vehicle front-rear direction is formed with an inclined portion that is inclined toward the vehicle lower side toward the front of the vehicle. When the battery is displaced to the front side of the vehicle, this inclined portion reduces the resistance of the seat cushion to enter the seat lower side. For this reason, the seat cushion is gradually pushed up while smoothly entering the lower side of the seat cushion.

  The vehicle lower structure according to a third aspect of the present invention is the vehicle lower structure according to the first or second aspect, wherein one end is attached to the seat cushion side so as to be relatively rotatable about an axis in the vehicle width direction. The end portion has a plurality of link members attached to the second floor portion side so as to be relatively rotatable about an axis in the vehicle width direction.

  According to the vehicle lower structure of the present invention described in claim 3, the plurality of link members are attached at one end to the seat cushion side so as to be relatively rotatable about an axis in the vehicle width direction and at the other end to the second floor. Since the vehicle is mounted on the side of the vehicle so as to be relatively rotatable about an axis in the vehicle width direction, when a load greater than a predetermined value from the battery to the rear end of the seat cushion is applied from the battery to the rear end of the seat cushion, The link member stably displaces the seat cushion to the raised position on the upper side of the seat, and the battery enters the lower side of the seat cushion.

  As described above, according to the vehicle lower structure according to claim 1 of the present invention, it is possible to apply an impact to the seat back even if the battery is displaced to the front side of the vehicle due to a rear collision of the high-speed traveling vehicle. It has an excellent effect that it can be suppressed or prevented.

  According to the vehicle lower structure according to claim 2, it is possible to suppress or prevent an impact from being applied to the seat back even when the battery is displaced to the front side of the vehicle due to a rear collision of the high-speed traveling vehicle. The impact on the seat cushion due to can be suppressed.

  According to the vehicle lower structure according to claim 3, when the high-speed traveling vehicle collides rearward, the battery cushion space is formed on the lower side of the seat while the seat cushion is stably displaced to the raised position on the upper side of the seat. It has an excellent effect of being able to.

[First Embodiment]
A first embodiment of a vehicle lower structure in the present invention will be described with reference to the drawings. In these drawings, an arrow UP appropriately shown indicates the vehicle upper side, an arrow FR indicates the vehicle front side, and an arrow W indicates the vehicle width direction.

  As shown in FIG. 1, the vehicle lower structure 12 in the present embodiment is a vehicle 10 in which a battery 18 is mounted on a rear floor portion 15 as a first floor portion constituting a bottom portion of a luggage room (also referred to as a luggage space) 14. (For example, a vehicle such as a hybrid vehicle and an electric vehicle).

  As shown in FIG. 2, the luggage room 14 in which the battery 18 is mounted is separated from the cabin 16 provided on the front side of the vehicle with respect to the luggage room 14 at the rear portion of the rear seat 20 as a vehicle seat. ing. The battery (battery pack) 18 includes a battery main body and a housing that stores the battery main body. The battery 18 mounted on the rear floor portion 15 is covered with a battery pack upper cover 17, and the lower end portion of the battery pack upper cover 17 is fixed to the rear floor portion 15 of the luggage room 14. Battery carrier brackets 19 are disposed on both sides of the battery 18 and the battery pack upper cover 17 in the vehicle width direction, and connect the battery pack upper cover 17 and the rear wheel house portion (not shown). Thus, the battery pack upper cover 17 is made to function as a part of the skeleton part, and the battery 18 is not easily detached (for example, it is not detached even if it is collided with a vehicle traveling at 50 km / h).

  As shown in FIG. 3, rear side members 44 extending in the vehicle front-rear direction are joined to both sides of the lower surface of the rear floor portion 15. The rear side member 44 is joined to the rear floor portion 15 to form a closed cross section. Thus, the rear side member 44 reinforces the rear floor portion 15 and increases the body rigidity. Further, a rear bumper reinforcement 46 having a longitudinal direction in the vehicle width direction is disposed at an end of the rear side member 44 on the vehicle rear side. The rear bumper reinforcement 46 is made of a long, high-strength, high-rigidity metal and has a substantially rectangular cross-sectional shape. When a rear collision occurs, a collision load is input and the load is transmitted to the rear side member 44. .

  As shown in FIG. 2, on the vehicle front side of the rear floor portion 15, a passenger compartment floor portion 32 as a second floor portion constituting the bottom portion of the cabin 16 is provided continuously to the rear floor portion 15. The rear seat 20 disposed on the passenger compartment floor portion 32 is disposed on the vehicle front side of the battery 18 and the seat cushion 22 on which the occupant P sits, and the rear end portion 22A of the seat cushion 22 (located on the vehicle rear side). 24A, the lower end 24A is disposed adjacent to the seat back 24 that supports the back of the occupant P, and the headrest that is provided on the upper end of the seat back 24 so as to be vertically adjustable and supports the head of the occupant P. 26, a slide mechanism 28 for sliding the seat cushion 22 in the vehicle front-rear direction, and a link mechanism 36 for lifting the seat cushion 22. The rear end portion 22A of the seat cushion 22 and the lower end portion 24A of the seat back 24 are connected via a recliner (reclining device) 23 for adjusting the tilt angle of the seat back 24. The seat lower portion 20A of the present embodiment includes a lower end portion 24A of the seat back 24, a seat cushion 22, a slide mechanism 28, and a link mechanism 36.

  The seat back 24 constitutes a rear portion of the seat, and a seat back frame (not shown) constituting a skeleton of the seat back 24 and a shape of the seat back 24 attached to the seat back frame and elastically deformable. A seat back pad (not shown), and a skin material 24B that covers the surface of the seat back pad. A rigid body guard 25A made of a steel panel is fixed to the lower back of the seat back 24. When the battery 18 is displaced to the front side of the vehicle due to a collision, the battery 18 should move slightly upward to the vehicle. Even if there is nothing, the battery 18 does not directly hit the seat back 24 by the rigid guard 25A.

  An occupant seating seat cushion 22 having a rear end 22A adjacent to the lower end 24A of the seat back 24 includes a seat cushion frame (not shown) that functions as a skeleton member disposed in the seat cushion 22. A seat cushion spring (not shown) spanned over the seat cushion frame, and a cushion portion (not shown) disposed on the seat cushion spring and supported by the seat cushion frame via the seat cushion spring; And a skin material 22B that adheres to the surface of the cushion portion and covers the cushion portion.

  The upper surface portion of the seat cushion 22 is a seating portion 22C on which the occupant P is seated, and the seat portion 22C supports the buttocks and thighs of the occupant P. Incidentally, in the present embodiment, the height position of the seating portion 22C is set slightly higher than the height position of the upper surface 18C of the battery 18. As shown in FIG. 3, a rigid guard 25B made of a steel panel is fixed to substantially the entire lower surface of the seat cushion 22, and when the battery 18 is displaced to the front side of the vehicle due to a collision, the battery 18 It directly prevents the seat cushion 22 from hitting the lower surface.

  The seat cushion 22 is supported by a slide mechanism 28 so as to be slidable in the vehicle front-rear direction. The slide mechanism 28 extends in the vehicle front-rear direction on both sides in the vehicle width direction (seat width direction) on the lower surface side of the seat cushion 22 and is formed into a channel-shaped lower rail 30, and the lower rail 30 The front and rear brackets (fixed plates) 29 that connect the passenger compartment floor 32 and the seat cushion frame (not shown) are fixed to the lower rail 30 so as to be slidable in the vehicle longitudinal direction and guided. A pair of left and right upper rails (not shown).

  A link mechanism 36 is provided below the seat cushion 22 and the lower rail 30, and a plurality of link members 34, 35 constituting the link mechanism 36 are attached to the seat cushion 22 via the lower rail 30. Yes. A pair of link members 34 and 35 are provided on the left and right sides of the lower surface side of the seat cushion 22 (in the drawing, the front link member is indicated by reference numeral 34 and the rear link member is indicated by reference numeral 35). . Each of the link members 34, 35 is arranged around a link shaft (link pin) 34A, 35A in the vehicle width direction on the downward bracket 30A of the lower rail 30 whose one end 34C, 35C (the left end in FIG. 3) is on the seat cushion 22 side. A link in the vehicle width direction is attached to a bracket 33 (that is, the vehicle compartment floor portion 32 side) whose other end portions 34D and 35D (right end portion in FIG. 3) are fixed to the vehicle compartment floor portion 32 while being attached to be relatively rotatable. The shafts (link pins) 34B and 35B are attached so as to be relatively rotatable.

  In addition, the link members 34 and 35 have a longitudinal direction not the horizontal direction but the vehicle lower side so that the link member 34 and 35 can rotate and move easily when a load from the vehicle rear side toward the vehicle front side is applied. It is arrange | positioned so that it may become the direction which inclines to. Further, the link length of the rear link member 35 is set slightly longer than the link length of the front link member 34. Note that a stopper for limiting the rotation angle of the link members 34 and 35 may be provided on the seat lower side of the seat cushion 22.

  Thus, as shown in FIG. 4, the seat cushion 22 is moved from the normal position 22 </ b> X where there is no space where the battery 18 can enter on the vehicle upper side of the passenger compartment floor portion 32 and on the lower side of the seat. When the vehicle 18 is displaced toward the front of the vehicle, the vehicle 18 can move to the raised position 22Y where the battery 18 has entered the vehicle upper side of the passenger compartment floor 32 and the lower side of the seat.

  That is, the link members 34, 35 are located in front of the vehicle 18 relative to the rear end portion 22 </ b> A of the seat cushion 22 (possibly the lower end portion 24 </ b> A of the seat back 24) from the battery 18 when the battery 18 is displaced toward the vehicle front side due to a collision. The space 40 in which the battery 18 can enter the seat cushion 22 below the seat cushion 22 by displacing the seat cushion 22 by the load f that is greater than or equal to a predetermined value acting on the side (in other words, to retract the battery 18). Space).

  In order to facilitate entry of the seat cushion 22 of the battery 18 to the seat lower side, in the present embodiment, the front portion 18A of the battery 18 in the vehicle front-rear direction is inclined toward the vehicle lower side toward the vehicle front. An inclined portion 18B is formed. A stopper 42 is provided on the seat lower side of the front end portion of the seat cushion 22 to limit the displacement of the battery 18 toward the vehicle front side from the front end portion of the seat cushion 22 when the battery 18 moves to the vehicle front side. It has been.

(Action / Effect)
Next, the operation and effect of the above embodiment will be described.

  As shown in FIG. 3, the seat cushion 22 of the seat lower portion 20 </ b> A is a normal position where there is no space where the battery 18 can enter on the vehicle upper side and the seat lower side of the passenger compartment floor portion 32 constituting the bottom of the cabin 16. As shown in FIG. 4, the battery 18 can move from 22X to the raised position 22Y where the battery 18 has entered the vehicle floor side 32 on the vehicle upper side and the seat lower side when the battery 18 is displaced to the vehicle front side due to the collision. It has become.

  For this reason, during normal times (except when the battery 18 is displaced forward of the vehicle due to a collision), the seat cushion 22 shown in FIG. 3 is disposed at the normal position 22X, and the height of the seating position is suppressed. Supplementally, since a fuel tank or the like is usually provided on the lower surface side of the passenger compartment floor portion 32 in the range of the seat cushion 22 below the seat, the height of the passenger compartment floor portion 32 and the seat cushion in this range are arranged. The height of the seating portion 22C of 22 must be increased to some extent. In the case of a comparison structure in which the battery is arranged in advance on the vehicle upper side of the passenger compartment floor portion and on the seat lower side of the seat cushion, the seat cushion seating portion is further increased in height. On the other hand, in the present embodiment, the seat cushion 22 is disposed at the normal position 22X where there is no space in which the battery 18 can enter on the lower side of the seat, so that the height of the seating position can be suppressed.

  On the other hand, as shown in FIG. 4, when the battery 18 is displaced to the front side of the vehicle due to the collision, the seat cushion 22 is disposed at the raised position 22 </ b> Y, and the battery 18 is located on the vehicle upper side of the passenger compartment floor portion 32. In addition, since it enters the lower side of the seat (retraction and holding of the battery at the time of a rear collision), the load from the displaced battery 18 to the seat back 24 is suppressed.

  More specifically, for example, when a large vehicle traveling at high speed has a rear collision (during a severe rear collision), a large collision load F is input to the rear bumper reinforcement 46 from the rear side of the vehicle. When the input collision load F is transmitted to the rear side member 44, the rear side member 44 absorbs predetermined energy at the time of collision while undergoing axial compression deformation. At this time, when the battery pack upper cover 17 (see FIG. 2) is removed from the rear floor portion 15 due to the collision load and the battery 18 is forcibly displaced toward the front side of the vehicle, the battery 18 is moved to the rear end portion 22A (in the case of the seat cushion 22). Depending on the situation, the lower end 24A) of the seat back 24 is pressed. When this pressing force (load f) is large, the front and rear brackets 29 of the rear seat 20 are broken.

  Here, since the front portion 18A of the battery 18 in the vehicle front-rear direction is formed with an inclined portion 18B that is inclined toward the vehicle lower side toward the vehicle front, when the battery 18 is displaced toward the vehicle front side due to a collision. The inclined portion 18B reduces the entry resistance of the seat cushion 22 to the seat lower side. For this reason, the battery 18 gradually pushes up the seat cushion 22 while smoothly entering the seat lower side of the seat cushion 22.

  The plurality of link members 34, 35 provided on the seat lower portion 20A have one end portions 34C, 35C around the link shafts 34A, 35A in the vehicle width direction on the downward bracket 30A (that is, the seat cushion 22 side) of the lower rail 30. The other end portions 34D and 35D are mounted so as to be relatively rotatable, and can be relatively rotated around the link shafts 34B and 35B in the vehicle width direction on a bracket 33 (that is, the vehicle compartment floor portion 32 side) fixed to the vehicle compartment floor portion 32. When a load f greater than a predetermined value from the battery 18 to the rear end portion 22A of the seat cushion 22 is applied to the front side of the vehicle during a rear collision, the seats are moved by the movement of the plurality of link members 34 and 35. The cushion 22 stably displaces to the ascending position 22Y on the upper side of the seat to form the entry space 40 for the battery 18. And, the battery 18 enters the seat lower side of the seat cushion 22.

  As described above, according to the vehicle lower structure 12 according to this embodiment, even if the battery 18 is displaced to the front side of the vehicle due to a rear collision of the high-speed traveling vehicle, it is possible to suppress or apply an impact to the seat back 24. In addition to preventing this, the impact of the battery 18 on the seat cushion 22 can also be suppressed. Further, since the impact received by the battery 18 itself can be suppressed, the battery 18 can be recycled.

  Furthermore, in the present embodiment, the link length of the rear link member 35 is set slightly longer than the link length of the front link member 34, so that the battery 18 is positioned below the seat back 24 in the rear collision. When retracted to the side, the seat back 24 and the headrest 26 are slightly tilted forward, so that the passenger's head can be supported more quickly.

[Second Embodiment]
Next, a vehicle lower structure 50 according to a second embodiment of the present invention will be described with reference to FIG. The vehicle lower structure 50 according to the second embodiment is high as shown in FIG. 5 instead of the slide mechanism 28 and the link mechanism 36 of the vehicle lower structure 12 according to the first embodiment shown in FIG. A feature is that a seat leg portion 52 that is extended by a load is provided. About another structure, it is a structure substantially the same as 1st Embodiment. Therefore, components that are substantially the same as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The seat leg portion 52 shown in FIG. 5 constitutes a part of the seat lower portion 20A and is provided in a pair on the left and right sides in the vehicle width direction (seat width direction) on the lower surface side of the seat cushion 22. The room floor 32 is connected. The pair of seat legs 52 are made of steel and extend in the vehicle front-rear direction along the lower surface of the seat cushion 22, respectively, and the front end and the rear end in the vehicle front-rear direction are bent toward the vehicle lower side. 52A and the rear leg 52B. The front leg portion 52A is attached to a bracket 33 fixed to the vehicle compartment floor portion 32 so as to be relatively rotatable around a pin shaft 52C in the vehicle width direction. The rear leg portion 52B 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. 5B when a tension of a predetermined value or more is applied. ing.

  As a result, as shown in FIG. 5A, the seat cushion 22 is moved from the normal position 22X where there is no space in which the battery 18 can enter on the vehicle upper side of the passenger compartment floor 32 and on the lower side of the seat. As shown in (B), when the battery 18 is displaced to the front side of the vehicle due to a collision, the battery 18 can move to the ascending position 22Y where the battery 18 has entered the vehicle floor side 32 on the vehicle upper side and the seat lower side. ing.

  That is, according to such a configuration, even if the battery 18 is displaced to the front side of the vehicle due to a rear collision of the high-speed traveling vehicle, the inclined portion 18B of the battery 18 displaced to the front side of the vehicle gradually moves the seat cushion 22 down. As a result, the rear leg 52B formed in a wave shape in a side view is plastically deformed in a substantially linear shape in a side view, and the seat cushion 22 moves to the raised position 22Y.

  For this reason, even if the battery 18 is displaced to the front side of the vehicle due to the rear collision of the high-speed traveling vehicle, it is possible to suppress or prevent the seat back 24 from being impacted, and the rear leg 52B is plastically deformed. Since the impact energy accompanying the displacement of the battery 18 is absorbed (demonstrating the energy absorption function), the impact of the battery 18 on the seat cushion 22 can be effectively suppressed. In the present embodiment, the front leg portion 52A does not extend, and only the rear leg portion 52B extends. Therefore, when the battery 18 is retracted to the seat lower side of the seat back 24 at the time of a rear collision, the seat back 24 and the headrest 26 are It will be tilted slightly forward, and the passenger's head can be supported more quickly.

  As a modification of the present embodiment, the rear bracket 29 and the rear link member 35 (see FIG. 3) may be used instead of the rear bracket 29 (see FIG. 3 and the like) on the seat rear side of the first embodiment. In place of the seat cushion 22 side and the vehicle compartment floor 32 side by disposing a connecting member formed in a wavy shape in a side view extending with a high load corresponding to the rear leg portion 52B. Also good.

[Third Embodiment]
Next, a vehicle lower structure 60 according to a third embodiment of the present invention will be described with reference to FIG. The vehicle lower structure 60 according to the third embodiment is characterized in that the lower rear portion of the rear seat 20 is supported by the front portion 18A of the battery 18 in a normal state. About another structure, it is a structure substantially the same as 1st Embodiment. Therefore, components that are substantially the same as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 6, the vehicle lower structure 60 according to the third embodiment is replaced with a slide mechanism 28 and a link mechanism 36 of the vehicle lower structure 12 according to the first embodiment shown in FIG. As shown in FIG. 6 (A), a front leg 62 and a rear leg 64 are provided. The front leg part 62 and the rear leg part 64 are formed in a bracket shape and are provided as a pair on the left and right sides of the lower side of the seat cushion 22 in the vehicle width direction (seat width direction). Yes. The front leg portion 62 is attached to the bracket 33 fixed to the passenger compartment floor portion 32 so as to be relatively rotatable around a pin shaft 62A in the vehicle width direction. The rear leg portion 64 is fixed to the side wall portion 18 </ b> D on the side of the inclined portion 18 </ b> B in the front portion 18 </ b> A of the battery 18 with a bolt 66.

  As a result, the seat cushion 22 is subjected to a collision as shown in FIG. 6B from the normal position 22X where the battery 18 is not allowed to enter the vehicle upper side of the passenger compartment floor 32 and the lower side of the seat. When the battery 18 is displaced to the front side of the vehicle, the battery 18 can move to the ascending position 22Y where the battery 18 enters the vehicle floor side 32 on the vehicle upper side and the seat lower side.

  That is, according to such a configuration, when the battery 18 is displaced to the front side of the vehicle due to a rear collision of the high-speed traveling vehicle, the bolt 66 is moved by the pressing force (load f) of the battery 18 toward the front side of the vehicle. The inclined portion 18B of the battery 18 that has been displaced and displaced toward the front of the vehicle gradually pushes up the seat cushion 22, and the seat cushion 22 moves to the raised position 22Y.

  For this reason, even if the battery 18 is displaced to the front side of the vehicle due to a rear-end collision of the high-speed traveling vehicle, it is possible to suppress or prevent the impact on the seat back 24 and to the impact on the seat cushion 22 by the battery 18. Can also be suppressed. In the present embodiment, since the seat cushion 22 rotates around the pin shaft 62A, the seat back 24 and the headrest 26 are slightly moved forward when the battery 18 is retracted to the seat lower side of the seat back 24 at the time of a rear collision. As a result, the occupant's head can be supported more quickly.

[Fourth Embodiment]
Next, a vehicle lower structure 70 according to a fourth embodiment of the present invention will be described with reference to FIG. The vehicle lower structure 70 according to the fourth embodiment is shown in FIG. 7 instead of fixing the rear leg portion 64 to the side wall portion 18D of the battery 18 with the bolt 66 as in the third embodiment shown in FIG. As described above, a feature is that a notch portion 72 is formed on the lower front side of the rear leg portion 64 and is engaged with a pin portion 74 protruding from the side wall portion 18D of the battery 18. About another structure, it is a structure substantially the same as 3rd Embodiment. Therefore, components substantially the same as those of the third embodiment are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 7A, the lower side portion 72A of the notch 72 is inclined toward the vehicle lower side toward the front of the vehicle, and is set to have the same angle as the inclination angle of the inclined portion 18B. Thereby, when the battery 18 is displaced to the front side of the vehicle, the pin portion 74 is easily removed from the cutout portion 72. Even with such a configuration, substantially the same operations and effects as in the third embodiment can be obtained.

[Fifth Embodiment]
Next, a vehicle lower structure 80 according to a fifth embodiment of the present invention will be described with reference to FIG. The fifth embodiment has substantially the same configuration as the first to fourth embodiments except for the points described below. Therefore, components substantially the same as those in the first to fourth embodiments are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 8A, the rear seat 20 includes seat frames 82 on both sides in the vehicle width direction (seat width direction) in the seat lower portion 20A. The seat frame 82 and the passenger compartment floor 32 are connected by front and rear brackets 84. The frame rear end portion 82A, which is the seat rear end portion side of the seat frame 82, rises to the upper side of the seat, and is connected to the lower end portion 24A of the seat back 24 to support the seat back 24 in a tiltable manner. The frame front end 82B, which is the seat front end side of the seat frame 82, also rises to the upper side of the seat, and the pin 86 disposed at the front end lower portion 22D of the seat cushion 22 rotates about the pin axis in the vehicle width direction. I support it as possible. Note that a seat pan (not shown) is provided in the seat cushion 22 of the present embodiment, and the rigidity of the seat cushion 22 in the seat width direction is secured by the seat pan.

  A portion of the seat frame 82 closer to the rear end of the seat and the rear end 22A of the seat cushion 22 are connected by a connecting member 88 made of steel that is extended by a high load. The connecting member 88 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. 8B when a tension greater than a predetermined value is applied. Yes.

  Accordingly, as shown in FIG. 8A, the seat cushion 22 is moved from the normal position 22X where there is no space where the battery 18 can enter on the vehicle upper side and the seat lower side of the passenger compartment floor 32, as shown in FIG. As shown in (B), when the battery 18 is displaced to the front side of the vehicle due to a collision, the battery 18 can move to the ascending position 22Y where the battery 18 has entered the vehicle floor side 32 on the vehicle upper side and the seat lower side. ing.

  That is, according to such a configuration, when the battery 18 is displaced to the front side of the vehicle due to a rear collision of the high-speed traveling vehicle, the inclined portion 18B of the battery 18 displaced to the front side of the vehicle gradually moves the seat cushion 22. Accordingly, the connecting member 88 formed in a wave shape in the side view is plastically deformed in a substantially linear shape in the side view, and the seat cushion 22 moves to the raised position 22Y.

  For this reason, even if the battery 18 is displaced to the front side of the vehicle due to a rear collision of the high-speed traveling vehicle, it is possible to suppress or prevent an impact on the seat back 24 and to prevent the battery while the connecting member 88 is plastically deformed. Since the impact energy accompanying the displacement of 18 is absorbed (the energy absorbing function is exhibited), the impact on the seat cushion 22 by the battery 18 can also be effectively suppressed.

[Supplementary explanation of the embodiment]
In the first embodiment, as shown in FIG. 4, the front and rear brackets 29 are broken by the pressing force (load f) of the battery 18 toward the vehicle front side at the time of a collision. In the third embodiment, the bolt 66 shown in FIG. 6 is pulled out by the pressing force (load f). For example, a sensor that detects displacement of the battery toward the vehicle front side due to a collision, and a seat And a fixing means for fixing the cushion side to the fixing target side (for example, the passenger compartment floor and the battery) and releasing the fixing of the seat cushion side to the fixing target side based on the detection result of the sensor. It is good.

  Moreover, in the said embodiment, the inclination part 18B is formed in the front part 18A of the vehicle front-back direction in the battery 18, and it raises the seat cushion 22 using the load f toward the vehicle front side of the battery 18 accompanying a collision. Although it is configured to move to 22Y, for example, a sensor that detects the displacement of the battery in front of the vehicle due to a collision, and an electric motor that moves the seat cushion at the normal position to the raised position based on the detection result of the sensor. It is good also as a structure which has a displacement means and a movement restriction means which restrict | limits the displacement amount to the vehicle front side of the said battery.

  Further, for example, there is provided interlocking means for interlocking the movement of the battery to the vehicle front side and the movement of the seat cushion to the raised position, and the interlocking means uses the moving force of the battery to the vehicle front side due to the collision. Thus, the seat cushion may be interlocked with the movement of the battery toward the front side of the vehicle, and the seat cushion may be moved from the normal position to the raised position before the battery collides with the rear end portion of the seat cushion.

  Furthermore, for example, in order to guide the battery displaced toward the front side of the vehicle to the seat lower side of the seat cushion, an inclined portion that is inclined toward the vehicle lower side toward the vehicle front may be provided at the rear end portion of the seat cushion. .

  Note that, for example, a guide portion that guides a battery, which is displaced substantially to the front side of the vehicle due to a collision, on the lower surface side of the seat cushion (for example, the lower surface side of the rigid guard 25B shown in FIG. 3) may be formed. Good.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a vehicle to which a vehicle lower structure according to a first embodiment of the present invention is applied as viewed obliquely from the rear (the vehicle exterior is indicated by a two-dot chain line). 1 is a perspective view showing a vehicle lower part structure according to a first embodiment of the present invention. It is a schematic side view which shows the vehicle lower part structure concerning the 1st Embodiment of this invention in the state before a rear collision. It is a schematic side view which shows the vehicle lower part structure concerning the 1st Embodiment of this invention in the state at the time of a rear collision. It is a schematic side view which shows the vehicle lower part structure concerning the 2nd Embodiment of this invention. FIG. 5A shows the state before the rear collision. FIG. 5B shows the state at the time of rear collision. It is a schematic side view which shows the vehicle lower part structure concerning the 3rd Embodiment of this invention. FIG. 6A shows the state before the rear collision. FIG. 6B shows the state at the time of rear collision. It is a schematic side view which shows the vehicle lower part structure which concerns on the 4th Embodiment of this invention. FIG. 7A shows the state before the rear collision. FIG. 7B shows the state at the time of rear collision. It is a schematic side view which shows the vehicle lower part structure concerning the 5th Embodiment of this invention. FIG. 8A shows the state before the rear collision. FIG. 8B shows the state at the time of a rear collision.

Explanation of symbols

12 Vehicle lower structure 14 Luggage room 15 Rear floor (first floor)
16 Cabin 18 Battery 18A Front 18B Inclined part 20 Rear seat (vehicle seat)
20A Seat lower part 22 Seat cushion 22A Rear end part of seat cushion 22X Normal position 22Y Ascending position 24 Seat back 24A Lower end part of seat back 32 Car compartment floor part (second floor part)
34, 35 Link member 34C, 35C One end 34D, 35D The other end 50, 60, 70, 80 Vehicle lower structure

Claims (3)

A first floor that forms the bottom of the luggage room;
A battery mounted on the first floor portion;
A second floor portion constituting the bottom of the cabin on the vehicle front side of the first floor portion;
A part of the vehicle seat is configured, a rear end portion is disposed adjacent to a lower end portion of the seat back on the vehicle front side of the battery, and is used for occupant seating, on the vehicle upper side of the second floor portion, and The battery has entered the vehicle on the upper side of the second floor portion and on the lower side of the seat when the battery is displaced forward from the normal position where there is no space where the battery can enter on the lower side of the seat. The lower part of the seat with a seat cushion movable to the raised position;
A vehicle lower structure comprising:   The vehicle lower structure according to claim 1, wherein an inclined portion that is inclined toward the vehicle lower side toward the vehicle front side is formed at a front portion of the battery in the vehicle front-rear direction.   A plurality of link members having one end portion attached to the seat cushion side so as to be relatively rotatable about an axis in the vehicle width direction and the other end portion attached to the second floor portion side so as to be relatively rotatable around an axis in the vehicle width direction The vehicle lower part structure according to claim 1, wherein the vehicle lower part structure is provided.

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