Vehicle undercarriage

Abstract

To acquire a vehicle lower structure capable of reducing a load transmitted to a battery from a lower hinge at the time of side collision of a vehicle.SOLUTION: A vehicle lower structure includes a lower hinge 46, a battery unit 18, an impact absorption member 40 and a guide member 64. The lower hinge 46 is arranged below a slide door 50, and supports the slide door 50 so as to slide in the vehicle frontward / backward direction. The battery unit 18 is arranged at a vehicle lower side of a floor panel 12 of a vehicle body 11. The impact absorption member 40 is arranged outside in the vehicle width direction of the battery unit 18 and on the vehicle lower side of the lower hinge 46. In the guide member 64, an inclined surface 64A1 is formed which is inclined toward the vehicle upper side as it goes inward in the vehicle width direction, and the guide member is arranged inside in the vehicle width direction of the lower hinge 46 and above the impact absorption member 40.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vehicle underbody structure.

Background Art

[0002] Patent Document 1 discloses a technique related to a vehicle underbody structure having a sliding door provided on a side portion of a vehicle body and slidable in the vehicle longitudinal direction. This sliding door is provided with a lower hinge that is connected to the vehicle body and supports the sliding door slidably.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a vehicle such as an electric vehicle, a battery unit may be mounted below a floor panel. In the vehicle underbody structure disclosed in Patent Document 1, a lower hinge is disposed between the floor panel and the battery when viewed from the side of the vehicle.

[0005]

[0006] Therefore, at the time of a side collision of the vehicle (hereinafter referred to as "side impact of the vehicle"), it is possible to prevent a collision load from being directly transmitted from the lower hinge to the battery. However, when such a configuration is adopted, the dimension in the vehicle vertical direction becomes large.

Means for Solving the Problems

[0007] <00000)37>The vehicle understructure according to claim 1 is provided on the side of the vehicle body and is positioned below a sliding door that is slidable in the longitudinal direction of the vehicle, and supports the sliding door so as to be slidable in the longitudinal direction of the vehicle relative to the vehicle body, a battery positioned on the lower side of the floor panel of the vehicle body, an impact absorbing member positioned on the outside of the battery in the vehicle width direction and on the lower side of the lower hinge to absorb collision energy, and a member positioned on the inside of the lower hinge in the vehicle width direction and on the upper side of the impact absorbing member, which is inclined toward the upper side of the vehicle as it moves toward the inside in the vehicle width direction The lower hinge can contact An inclined surface is formed When the lower hinge comes into contact with the inclined surface during a side collision of the vehicle, the lower hinge is guided toward the upper side of the vehicle as it moves inward in the vehicle width direction along the inclination of the inclined surface. It is equipped with a guide member.

[0008] The vehicle understructure according to claim 1 comprises a lower hinge, a battery, an impact absorbing member, and a guide member. The lower hinge is located at the bottom of a sliding door provided on the side of the vehicle body and supports the sliding door so that it can slide relative to the vehicle body in the longitudinal direction. The battery is located on the lower side of the floor panel of the vehicle body. The impact absorbing member is located on the outside of the battery in the vehicle width direction and on the lower side of the lower hinge. The guide member is located on the inside of the lower hinge in the vehicle width direction and above the impact absorbing member, and has an inclined surface that slopes upward toward the vehicle as it moves inward in the vehicle width direction.

[0009] Thus, in this invention, since the impact absorbing member is provided on the outside of the battery in the vehicle width direction, the impact energy can be absorbed by the impact absorbing member during a side collision with the vehicle. Furthermore, in this invention, a guide member is positioned on the inside of the lower hinge in the vehicle width direction and above the impact absorbing member. In other words, in this invention, a guide member is positioned between the lower hinge and the battery in the vehicle width direction.

[0010] The guide member has an inclined surface that slopes upward towards the vehicle as it moves inward in the vehicle width direction. Therefore, in the event of a side collision, if the lower hinge enters inward in the vehicle width direction via the sliding door, the lower hinge will come into contact with the inclined surface of the guide member and will be guided upward towards the vehicle as it moves inward in the vehicle width direction along the inclined surface.

[0011] In other words, in this invention, when a vehicle is involved in a side collision, the lower hinge comes into contact with the inclined surface of the guide member, and the collision load transmitted to the lower hinge is distributed through the guide member. Therefore, in this invention, even if the lower hinge were to collide with the battery via the guide member during a side collision, the collision load transmitted to the battery would be reduced compared to a case where the guide member is not provided.

[0012] Furthermore, in the present invention, when a vehicle is involved in a side collision, the lower hinge comes into contact with the inclined surface of the guide member. As the lower hinge moves inward along the inclined surface in the vehicle width direction, it is guided upward towards the vehicle, thereby preventing the lower hinge from colliding with the battery via the guide member.

[0013] Here, in cases such as "a battery located on the lower side of the floor panel of the vehicle," or when a B component is located on the lower side of a B component, or when a B component is located on the upper side of a B component, it is indicated that at least a portion of the A component overlaps with the B component in a plan view of the vehicle.

[0014] The vehicle understructure according to claim 2 is the vehicle understructure according to claim 1, wherein the upper end of the guide member located on the inside in the vehicle width direction is positioned on the upper side of the battery and fixed to the lower side of the floor panel.

[0015] In the vehicle understructure according to claim 2, the guide member has an upper end located on the inside in the vehicle width direction, positioned on the upper side of the battery and fixed to the lower side of the floor panel or the lower surface of the floor panel.

[0016] In the event of a side collision with a vehicle, if the lower hinge enters inward in the vehicle width direction via the sliding door, the lower hinge will be guided toward the upper side of the battery as it moves inward in the vehicle width direction along the inclined surface of the guide member.

[0017] In this invention, since the battery is located on the lower side of the floor panel, for example, by fixing the upper end of the guide member to the lower surface of the floor panel, the lower hinge is guided towards the upper side of the battery via the guide member during a side collision of the vehicle. As a result, in this invention, it is possible to suppress the lower hinge from colliding with the battery via the guide member.

[0018] The vehicle understructure according to claim 3 is the vehicle understructure according to claim 1, wherein the bead portion protruding from the inclined surface extends along the inclined surface.

[0019] In the vehicle understructure according to claim 3, a bead portion protrudes from the inclined surface. The bead portion extends along the inclined surface, improving the rigidity of the inclined portion itself where the inclined surface is formed. As a result, in the present invention, when the lower hinge comes into contact with the inclined surface during a side collision of the vehicle, deformation of the inclined portion is suppressed, and inward movement of the lower hinge in the vehicle width direction is further suppressed. [Effects of the Invention]

[0020] As described above, the vehicle understructure according to the present invention can reduce the load transmitted from the lower hinge to the battery during a side collision of the vehicle. [Brief explanation of the drawing]

[0021] [Figure 1] This is a cross-sectional view showing the lower part of a vehicle to which the vehicle understructure according to this embodiment is applied. [Figure 2]It is a perspective view showing a guide member that forms a part of the vehicle lower structure according to this embodiment. [Figure 3] It is a cross-sectional view showing a modification of the lower part of a vehicle to which the vehicle lower structure according to this embodiment is applied.

Mode for Carrying Out the Invention

[0022] Hereinafter, the vehicle lower structure according to the embodiment will be described with reference to the drawings. The arrow UP appropriately shown in each figure indicates the upper side of the vehicle, the arrow FR indicates the front side of the vehicle, and the arrow LH indicates the left side in the vehicle width direction (left-right direction). Also, when the front-rear, up-down, and left-right directions are used without special mention in the following description, they indicate the front-rear in the vehicle front-rear direction, the up-down in the vehicle up-down direction, and the left-right when facing the traveling direction.

[0023] (Configuration of Vehicle Lower Structure) First, the configuration of the vehicle lower structure according to this embodiment will be described.

[0024] As shown in FIG. 1, the vehicle body 11 of the vehicle 10 to which the vehicle lower structure according to this embodiment is applied includes a floor panel 12 that forms the floor surface of the passenger compartment. The floor panel 12 extends in the vehicle width direction and the vehicle front-rear direction with the vehicle up-down direction as the plate thickness direction, and a floor carpet 14 is laid on the upper surface 12A of the floor panel 12. Also, a side member 16 extends in the vehicle front-rear direction on the lower surface 12B of the floor panel 12, whereby the floor panel 12 is reinforced.

[0025] Here, a battery unit (battery) 18 is arranged below the floor panel 12 (here, below the side member 16), and the battery unit 18 is provided in substantially the entire area below the floor panel 12. For this reason, the side member 16 is arranged above the battery unit 18 in the vehicle, and a part of the battery unit 18 overlaps with the side member 16 in a plan view of the vehicle.

[0026] The battery unit 18 includes a case 20 that forms its outer shape. The case 20 houses multiple battery cells (not shown), a wire harness, a cooling device, and the like, and is configured to supply drive power from the battery unit 18 to a motor (not shown).

[0027] The case 20 is composed of a bottom wall 22, a peripheral wall 24, and a lid 26. The bottom wall 22 extends in the vehicle width direction and the vehicle longitudinal direction, with the plate thickness direction being in the vehicle vertical direction. Both ends of the bottom wall 22 in the vehicle width direction are fastened to rockers 34, which will be described later, by bolts 28 and nuts 30. Although not shown in the figures, the bottom wall 22 is fastened to the rockers 34 at predetermined intervals in the vehicle longitudinal direction.

[0028] A peripheral wall 24 is erected on the outer periphery of the bottom wall 22, and the peripheral wall 24 is formed in a frame shape when viewed from above. In this embodiment, as an example, the peripheral wall 24 is formed by extrusion molding of a metal such as aluminum. Here, the portion of the peripheral wall 24 that constitutes the side of the battery unit 18 has a closed cross-sectional structure when viewed from the front-rear direction of the vehicle, and is divided into multiple (two) closed cross-sectional sections 24B, 24C in the vertical direction of the vehicle by upper and lower partition walls 24A that extend in the vehicle width direction (as will be described later).

[0029] A cover 26 is provided on the top of the battery unit 18. The cover 26 is formed in a substantially rectangular shape so as to correspond to the outer shape of the peripheral wall 24 with the vehicle's vertical direction as the plate thickness direction, and the outer ends of the cover 26 are fastened to the upper surface of the peripheral wall 24 by bolts 32.

[0030] A rocker 34 is provided on the outside of the battery unit 18 configured as described above, in the vehicle width direction. The rocker 34 is located at the bottom of the vehicle body 11 and is composed of a rocker outer panel 36 and a rocker inner panel 38.

[0031] The rocker outer panel 36 is located on the outside in the vehicle width direction and is formed in a roughly crank shape when viewed from the front-rear direction of the vehicle. On the other hand, the rocker inner panel 38 is located on the inside in the vehicle width direction and is formed in a roughly hat-shaped cross-section that is open to the outside in the vehicle width direction when viewed from the front-rear direction of the vehicle. The upper and lower ends of the rocker outer panel 36 and the rocker inner panel 38 are joined, respectively, so that the rocker 34 has a closed cross-sectional structure.

[0032] An impact-absorbing member 40 is positioned within the closed cross-section of the rocker 34. The impact-absorbing member 40 is located between the battery unit 18 and the sliding door 50 and extends along the rocker 34 in the longitudinal direction of the vehicle. In this embodiment, as an example, the impact-absorbing member 40 is formed from an extruded metal product such as aluminum.

[0033] Furthermore, the impact absorbing member 40 has a closed cross-sectional structure when viewed from the front-rear direction of the vehicle, and the inside of the impact absorbing member 40 is divided into multiple (three) closed cross-sectional sections 40B, 40C, and 40D in the vehicle width direction by two vertical walls 40A that extend in the vertical direction of the vehicle.

[0034] In this embodiment, a step 41 for passengers to get on and off and a step under panel 42 to which the step 41 is fixed are provided on the outside of the floor panel 12 in the vehicle width direction and between the floor panel 12 and the battery unit 18 in the vehicle vertical direction.

[0035] The step under panel 42 is formed in a hook shape and consists of an upper flange portion 42A, a vertical wall 42B, and a horizontal wall 42C. The upper flange portion 42A is bent to follow the lower surface 12B of the floor panel 12 and is joined to both ends of the lower surface 12B of the floor panel 12 in the vehicle width direction. The vertical wall 42B hangs down from the upper flange portion 42A toward the vehicle side between the lower surface 12B of the floor panel 12 and the cover 26 of the battery unit 18.

[0036] The side wall 42C extends from the vertical wall 42B along the cover 26 of the battery unit 18, and outward in the vehicle width direction beyond the peripheral wall 24 of the battery unit 18. A roller guide portion 44 is provided on the lower surface 42C1 side of the side wall 42C. The roller guide portion 44 consists of a pair of left and right guide pieces 44A that protrude downward from the side wall 42C toward the vehicle side, and these guide pieces 44A are formed integrally with the side wall 42C.

[0037] Furthermore, the pair of guide pieces 44A extend along the vehicle's longitudinal direction on the side wall 42C, and the guide rollers 48 of the lower hinge 46, which will be described later, are positioned between the pair of guide pieces 44A. The roller guide section 44 is rotatably supported and guides the lower hinge 46 to move in the vehicle's longitudinal direction via the guide rollers 48.

[0038] Furthermore, the step under panel 42 is fitted with an opening / closing device 52 that opens and closes the sliding door 50 using a motor (not shown). The sliding door 50 is located on the side of the vehicle body 11 and is configured to open and close an opening 11A formed on the side of the vehicle body 11 for passengers to get in and out.

[0039] On the vehicle body 11 side, although not shown in the figures, guide sections are provided in the upper, central, and lower parts in the vertical direction of the vehicle, extending in the longitudinal direction of the vehicle, and hinge sections are provided on the sliding door 50 side that engage with each of the guide sections. These hinge sections support the sliding door 50 so that it can move relative to the vehicle body 11 in the longitudinal direction of the vehicle. The lower hinge 46 mentioned above is a hinge section provided at the bottom of the sliding door 50.

[0040] In this embodiment, the lower hinge 46 is positioned outside the vehicle width direction relative to the battery unit 18, above the rocker 34, and overlapping with the battery unit 18 when viewed from the side of the vehicle.

[0041] The lower hinge 46 is attached to the inner surface of the door inner panel 54 in the vehicle width direction, and is formed in a substantially L shape when viewed from the rear in the vehicle front-rear direction. It consists of a hinge body 56, a base 58, and a connecting member 60. The hinge body 56 and the base 58 are connected via the connecting member 60, and the base 58 extends inward in the vehicle width direction.

[0042] Furthermore, the base portion 58 rotatably supports the guide roller 48 and the load roller 62, respectively. As described above, the guide roller 48 is supported by the roller guide portion 44 and guides the lower hinge 46 so that it can move in the longitudinal direction of the vehicle. On the other hand, the load roller 62 abuts against the lower flange portion 64C of the guide member 64, which will be described later, and the lower hinge 46 is supported via the load roller 62.

[0043] Now, let's describe the guide member 64. The guide member 64 is made of a metal such as iron. When the sliding door 50 is closed, the guide member 64 is positioned inward from the lower hinge 46 in the vehicle width direction and opposite the lower hinge 46. In other words, in this embodiment, the guide member 64 is positioned between the battery unit 18 and the lower hinge 46 in the vehicle width direction.

[0044] As shown in Figure 2, the guide member 64 is composed of an inclined portion 64A, an upper flange portion 64B, and a lower flange portion 64C. The inclined portion 64A is inclined toward the upper side of the vehicle as it moves inward in the vehicle width direction. Therefore, the guide member 64 is formed such that the upper flange portion 64B is positioned further inward in the vehicle width direction than the lower flange portion 64C. In addition, a bead portion 66 protruding from the inclined surface 64A1 extends along the inclined surface 64A1 of the inclined portion 64A. Note that multiple bead portions 66 are formed along the vehicle's longitudinal direction.

[0045] On the other hand, as shown in Figure 1, the upper flange portion 64B of the guide member 64 is joined to the lower surface 42C1 of the side wall 42C of the step under panel 42 by welding or the like, and the lower flange portion 64C is joined to the upper wall surface 38A of the rocker inner panel 38 by welding or the like. In other words, the guide member 64 is fixed between the battery unit 18 and the lower hinge 46 while being spanned between the step under panel 42 and the rocker 34. If the guide member 64 is made of resin, it is fixed to the step under panel 42 and the rocker 34 by adhesive or the like.

[0046] Furthermore, in this embodiment, a peripheral wall 24 is erected on the battery unit 18. However, in order to avoid interference with the guide member 64, the upper part 25 side of the peripheral wall 24 is an inclined wall that slopes upward towards the vehicle as it moves inward in the vehicle width direction.

[0047] (Function and effect of the vehicle's understructure) Next, the operation and effects of the vehicle understructure according to this embodiment will be described.

[0048] As shown in Figure 1, the vehicle understructure in this embodiment includes a lower hinge 46, a battery unit 18, a shock-absorbing member 40, and a guide member 64. The lower hinge 46 is located below the sliding door 50, which is provided on the side of the vehicle body 11, and supports the sliding door 50 so that it can slide in the longitudinal direction relative to the vehicle body 11. The battery unit 18 is located on the lower side of the floor panel 12 of the vehicle body 11.

[0049] On the other hand, the shock-absorbing member 40 is positioned on the outside of the battery unit 18 in the vehicle width direction and on the lower side of the lower hinge 46, and is provided within the closed cross-section of the rocker 34. The guide member 64 is positioned on the inside of the lower hinge 46 in the vehicle width direction and above the shock-absorbing member 40, and the guide member 64 has an inclined surface 64A1 that slopes upward towards the vehicle as it moves inward in the vehicle width direction.

[0050] As described above, in this embodiment, since the impact absorbing member 40 is provided on the outside of the battery unit 18 in the vehicle width direction, a portion of the collision energy can be absorbed by the impact absorbing member 40 when the vehicle 10 is involved in a side collision. This suppresses the input of impact load to the battery unit 18, which is positioned inside the impact absorbing member 40 in the vehicle width direction, and improves the protective performance of the battery unit 18 when the vehicle 10 is involved in a side collision.

[0051] In this embodiment, the closed cross-section of the impact absorbing member 40 is partitioned in the vehicle width direction by a vertical wall 40A. Therefore, in the event of a side collision with the vehicle 10, the closed cross-section portion 40D on the collision side collapses first to absorb the impact, followed by the closed cross-section portion 40C, and then the closed cross-section portion 40B. In other words, in this embodiment, the closed cross-section can be collapsed in stages, thereby improving the impact absorption performance.

[0052] On the other hand, the closed cross-section of the peripheral wall 24 in the battery unit 18 is divided vertically by the upper and lower partition walls 24A. That is, since the upper and lower partition walls 24A extend in the vehicle width direction, the load-bearing performance against loads acting in the vehicle width direction during a side collision of the vehicle 10 can be improved. Therefore, in this embodiment, the impact absorption performance of the impact absorbing member 40 can be improved, and the load-bearing performance of the battery unit 18 can be improved.

[0053] Furthermore, in this embodiment, the lower hinge 46 is positioned on the outside of the battery unit 18 in the vehicle width direction, and the lower hinge 46 and the battery unit 18 overlap in a side view of the vehicle. For this reason, in this embodiment, a guide member 64 is positioned between the lower hinge 46 and the battery unit 18 in the vehicle width direction.

[0054] Here, the guide member 64 has an inclined surface 64A1 that slopes upward towards the vehicle as it moves inward in the vehicle width direction. Therefore, although not shown in the figures, when the vehicle 10 is involved in a side collision and the lower hinge 46 enters inward in the vehicle width direction via the sliding door 50, the lower hinge 46 comes into contact with the inclined surface 64A1 of the guide member 64 and is guided upward towards the vehicle as it moves inward in the vehicle width direction along the inclined surface 64A1.

[0055] In other words, in this embodiment, when the vehicle 10 is involved in a side collision, the lower hinge 46 comes into contact with the inclined surface 64A1 of the guide member 64, and the collision load transmitted to the lower hinge 46 is distributed via the guide member 64. Therefore, in this embodiment, even if the lower hinge 46 were to collide with the battery unit 18 via the guide member 64 during a side collision of the vehicle 10, the collision load transmitted to the battery unit 18 can be reduced compared to a case where the guide member is not provided.

[0056] Furthermore, in this embodiment, when the vehicle 10 is involved in a side collision, the lower hinge 46 comes into contact with the inclined surface 64A1 of the guide member 64, and as the lower hinge 46 moves inward in the vehicle width direction along the inclined surface 64A1, it is guided toward the upper side of the vehicle. Therefore, in this embodiment, it is possible to suppress the lower hinge 46 from colliding with the battery unit 18 via the guide member 64.

[0057] To explain in more detail, in this embodiment, the upper flange portion 64B of the guide member 64 is joined to the lower surface 42C1 of the side wall 42C of the step under panel 42, that is, to the upper side of the battery unit 18.

[0058] Therefore, when the vehicle 10 is involved in a side collision, the lower hinge 46 moves inward in the vehicle width direction and comes into contact with the inclined surface 64A1 of the guide member 64. This guides the lower hinge 46 toward the upper flange portion 64B of the guide member 64, towards the upper side of the vehicle relative to the battery unit 18. As a result, in this embodiment, it is possible to prevent collision with the battery unit 18, thereby protecting the battery unit 18.

[0059] Furthermore, generally, the floor panel 12 has a structure that suppresses inward movement in the vehicle width direction by the barrier, such as having cross members arranged along the vehicle width direction, although this is not shown in the diagram. As a result, when the upper flange portion 64B of the guide member 64 is fixed to the lower surface 12B of the floor panel 12, it is possible to suppress the inward movement of the upper flange portion 64B of the guide member 64 in the vehicle width direction when the vehicle 10 is hit from the side, thereby suppressing inward movement in the vehicle width direction by the lower hinge 46.

[0060] Furthermore, in this embodiment, as shown in Figure 2, a bead portion 66 protrudes from the inclined surface 64A1 of the guide member 64. The bead portion 66 extends along the inclined surface 64A1. In this embodiment, by providing the bead portion 66, the rigidity of the inclined portion 64A itself can be improved.

[0061] As a result, in this embodiment, when the vehicle 10 shown in Figure 1 is involved in a side collision, the deformation of the inclined portion 64A is suppressed when the lower hinge 46 comes into contact with the inclined surface 64A1, and the inward movement of the lower hinge 46 in the vehicle width direction is further suppressed.

[0062] In this embodiment, the lower hinge 46 is positioned to overlap with the battery unit 18 when viewed from the side of the vehicle, but this is not the only possible configuration. For example, the lower hinge 46 may be positioned above the battery unit 18 when viewed from the side of the vehicle.

[0063] Furthermore, in this embodiment, the shock-absorbing member 40 is arranged within the cross-section of the rocker 34. This eliminates the need to separately secure space for the shock-absorbing member 40, and allows the shock-absorbing member 40 to be placed while securing space between the battery unit 18 and the sliding door 50. However, the shock-absorbing member 40 may be provided separately.

[0064] (Modified version of this embodiment) In the above embodiment, as shown in Figure 1, a side member 16 is fixed to the lower surface 12B of the floor panel 12, and a rocker 34 and a lower hinge 46 are provided on the outside in the vehicle width direction of the battery unit 18 which is located below the side member 16, with the lower hinge 46 located above the rocker 34.

[0065] In contrast, in the modified version, as shown in Figure 3, the side member 16 is not provided on the lower surface 12B of the floor panel 12, and the battery unit 18 is provided on the lower side of the floor panel 12. In this modified version, since the side member 16 is not provided, the height of the battery unit 18 can be increased, and the battery capacity can be increased.

[0066] In another modified example, a rocker 34, a lower hinge 46, and a shock-absorbing member 70 are provided on the outside of the battery unit 18 in the vehicle width direction, and the lower hinge 46 is positioned between the rocker 34 and the shock-absorbing member 70 when viewed from the side of the vehicle. Note that for components having substantially the same configuration as those in the above embodiment, the same reference numerals are used in the modified example and their description is omitted.

[0067] Here, a flange portion 12B that bends upward is provided on the outer side of the floor panel 12 in the vehicle width direction, and this flange portion 12B is joined to the rocker inner panel 38 by welding or the like. A roller guide bracket 72 that supports the guide roller 48 of the lower hinge 46 is fastened to the lower wall surface 38B of the rocker inner panel 38 with bolts 74 and nuts 76.

[0068] On the other hand, the shock-absorbing member 70 is formed from, for example, an extruded metal product such as aluminum. The shock-absorbing member 70 has a substantially rectangular shape with the vehicle width direction as its longitudinal direction, and the inside of the shock-absorbing member 70 is composed of a plurality of inclined walls 78 that are inclined with respect to the vehicle's vertical direction, and are formed continuously in a zigzag pattern along the vehicle's vertical direction. The lower wall portion 70A of the shock-absorbing member 70 is fastened to the bottom wall 22 of the case 20 of the battery unit 18.

[0069] In this embodiment, the lower hinge 46 is positioned between the rocker 34 and the shock-absorbing member 70 in a side view of the vehicle, and the guide member 64 is positioned between the battery unit 18 and the lower hinge 46. In this embodiment, the upper flange portion 64B of the guide member 64 is joined to the lower surface 12B of the floor panel 12 by welding or the like, and the lower flange portion 64C is joined to the upper wall surface 70B of the shock-absorbing member 70 by welding or the like.

[0070] In this embodiment, since the impact absorbing member 70 is provided on the outside of the battery unit 18 in the vehicle width direction, when the vehicle 10 is involved in a side collision, the impact energy can be absorbed by the impact absorbing member 70 together with the impact absorbing member 40 provided inside the rocker 34.

[0071] Furthermore, while the interior of the impact-absorbing member 40 is partitioned by independent vertical walls 40A, the interior of the impact-absorbing member 70 is partitioned by continuous inclined walls 78. Therefore, the impact-absorbing member 70 can obtain a bracing force from the inclined walls 78, and can obtain a higher resistance force than when partitioned by vertical walls 40A during a side collision with the vehicle 10, thereby increasing the amount of collision energy absorbed. The internal shape of the impact-absorbing member 40 is not limited to this, as long as it can absorb collision energy through deformation.

[0072] Furthermore, the present invention can be implemented with various modifications without departing from its essence. Of course, the scope of the present invention is not limited to the above embodiments or the above-described modifications.

[0073] <Note> Furthermore, the following configurations may be combined as appropriate to form the vehicle understructure according to the present invention.

[0074] (Composition 1) The vehicle understructure includes a lower hinge positioned below a sliding door located on the side of the vehicle body and capable of sliding in the longitudinal direction of the vehicle, which supports the sliding door so that it can slide in the longitudinal direction of the vehicle relative to the vehicle body; a battery positioned on the lower side of the floor panel of the vehicle body; an impact absorbing member positioned on the outside of the battery in the vehicle width direction and on the lower side of the lower hinge to absorb collision energy; and a component positioned on the inside of the lower hinge in the vehicle width direction and on the upper side of the impact absorbing member, which inclines towards the upper side of the vehicle as it moves inward in the vehicle width direction. The lower hinge can contact An inclined surface is formed When the lower hinge comes into contact with the inclined surface during a side collision of the vehicle, the lower hinge is guided toward the upper side of the vehicle as it moves inward in the vehicle width direction along the inclination of the inclined surface. It is equipped with a guide member.

[0075] (Configuration 2) The upper end of the guide member, located on the inside in the vehicle width direction, is positioned on the upper side of the battery and fixed to the lower side of the floor panel.

[0076] (Composition 3) A bead portion that protrudes upward toward the vehicle extends along the inclined surface. [Explanation of Symbols]

[0077] 10 vehicles 11 Vehicle body 12 Floor Panels 12A Bottom 18 Battery Unit (Battery) 34 Rocka 40 Impact absorbing material 46 Lower Hinge 50 Sliding Door 64 Guide member 64A1 Slope 64B Upper flange portion (upper end portion located on the inside in the vehicle width direction of the guide member) 66 Bead section 70 Impact absorbing material

Claims

1. A lower hinge is provided on the side of the vehicle body and positioned at the bottom of a sliding door that is slidable in the vehicle's longitudinal direction, and supports the sliding door so that it can slide in the vehicle's longitudinal direction relative to the vehicle body. The battery located on the lower side of the vehicle's floor panel, An impact absorbing member is positioned on the outer side of the battery in the vehicle width direction and on the lower side of the lower hinge to absorb collision energy, A guide member is positioned on the inside of the lower hinge in the vehicle width direction and on the upper side of the impact absorbing member, and is inclined upward towards the vehicle as it moves inward in the vehicle width direction, forming an inclined surface that the lower hinge can contact, and when the lower hinge contacts the inclined surface during a side collision of the vehicle, the guide member guides the lower hinge inward in the vehicle width direction and upward towards the vehicle as it moves inward. A vehicle understructure equipped with the following features.

2. The vehicle understructure according to claim 1, wherein the upper end of the guide member located on the inside in the vehicle width direction is positioned on the vehicle's upper side of the battery and fixed to the vehicle's lower side of the floor panel or to the lower surface of the floor panel.

3. The vehicle understructure according to claim 1, wherein the bead portion protruding from the inclined surface extends along the inclined surface.

Images