Vehicle lower structure

Abstract

To obtain a vehicle lower structure which can inhibit increase of the weight while securing rigidity.SOLUTION: A vehicle lower structure 10 includes: a pair of vehicle body skeleton members; an intermediate member 21 at least partially disposed between the pair of vehicle body skeleton members: a power storage device 40 disposed below the intermediate member 21; a seat 11 disposed above the intermediate member 21; and a reinforcement member 31 disposed at the interior of the intermediate member 21 or on an upper surface of the intermediate member 21. The vehicle lower structure has an area in which the reinforcement member 31 is not provided below the seat 11 in a vehicle vertical direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle undercarriage. [Background technology]

[0002] As disclosed in Japanese Patent Application Laid-Open No. 2020-142589 (Patent Document 1), it is necessary to minimize an increase in the weight of the vehicle undercarriage while ensuring the rigidity of the vehicle undercarriage. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-142589 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure aims to provide a vehicle understructure that can suppress an increase in the weight of the vehicle understructure while ensuring the rigidity of the vehicle understructure. [Means for solving the problem]

[0005] The vehicle undercarriage structure of the present disclosure comprises a pair of body frame members, a first intermediate member at least a portion of which is arranged between the pair of body frame members, an energy storage device arranged below the first intermediate member, a first seat arranged above the first intermediate member, and a first reinforcing member arranged inside the first intermediate member or on the upper surface of the first intermediate member, and is characterized by having an area below the first seat in the vertical direction of the vehicle where the first reinforcing member is not provided.

[0006] According to the above configuration, even if there are cases where the rigidity of the first intermediate member alone is not sufficient to withstand the load, the presence of the first reinforcing member makes it possible for the first intermediate member and the first reinforcing member to work together to withstand the load of the occupant, and while rigidity is ensured by the presence of the first reinforcing member, it is possible to prevent an increase in the weight of the vehicle undercarriage due to the existence of an area below the first seat in the vertical direction of the vehicle where the first reinforcing member is not provided.

[0007] In the above disclosure, there is provided a lower frame including a pair of side members, a front member connecting front portions of the pair of side members, a rear member connecting rear portions of the pair of side members, and a cross member connecting intermediate portions of the pair of side members in the vehicle fore-and-aft direction, wherein the pair of body frame members are any two members selected from the pair of side members, the front member, and the cross member, the first intermediate member is arranged to fill a space formed inside the pair of side members, the front member, and the cross member, the first reinforcing member has a first support area and defines a first right-side reference line and a first left-side reference line extending in the vehicle fore-and-aft direction along the right and left end portions of the first seat in the vehicle width direction, respectively, and further, when the first support area is projected vertically upward, a first projected image formed by the projection may be located forward of the front end portion of the first seat and between the first right-side reference line and the first left-side reference line.

[0008] According to the above configuration, the first intermediate member can be positioned without any gaps in the space formed inside the plurality of members, including the pair of side members, the front member, the cross member, and the rear member.

[0009] In the above disclosure, the first reinforcing member may be provided so as to extend rearward from the front member in the vehicle longitudinal direction.

[0010] According to the above configuration, the first reinforcing member is joined to the front member, so that the first reinforcing member can withstand a larger load.

[0011] In the above disclosure, the lower frame includes a plurality of the cross members, and the vehicle undercarriage structure further includes a second intermediate member arranged to fill the space formed inside the pair of side members and the plurality of cross members, the storage device is arranged below both the first intermediate member and the second intermediate member, and the vehicle undercarriage structure further includes a second seat and a second reinforcing member arranged inside the second intermediate member or on the upper surface of the second intermediate member, the second reinforcing member has a second support area and defines a second right-side reference line and a second left-side reference line extending in the fore-and-aft direction of the vehicle along the right and left ends of the second seat in the vehicle width direction, and further, when the second support area is projected vertically upward, the second projected image formed by the projection may be located forward of the front end of the second seat and between the second right-side reference line and the second left-side reference line.

[0012] According to the above configuration, even if there are cases where the rigidity of the second intermediate member alone is not sufficient to withstand the load, the presence of the second reinforcing member makes it possible for the second intermediate member and the second reinforcing member to work together to withstand the load of the occupant, and the presence of the second reinforcing member makes it possible to prevent an increase in the weight of the vehicle undercarriage while ensuring rigidity.

[0013] In the above configuration, the second reinforcing member may be provided so as to extend from any one of the plurality of cross members toward the front or rear in the vehicle longitudinal direction.

[0014] According to the above configuration, the second reinforcing member is joined to the cross member, so that the second reinforcing member can withstand a larger load.

[0015] In the above configuration, the energy storage device includes a storage module including a plurality of storage cells arranged horizontally, a case having a top plate and a bottom plate and housing the storage module, and a rigid board arranged between the top plate and the storage module, and when the first reinforcing member is projected downward in the vertical direction, at least a portion of a third projection image formed by the projection may be positioned so as not to overlap the rigid board.

[0016] According to the above configuration, the fact that the third projection image of the first reinforcing member is positioned so as not to overlap the rigid board means that the rigid board is not present at that position. Even if there is a part of the rigid board where it is not present as described above, the rigidity can be ensured by the presence of the first reinforcing member, and since the presence of the rigid board is omitted, it is possible to manufacture the vehicle undercarriage at a lower cost.

[0017] In the above configuration, the power storage device may further include a cushion member disposed between the top plate and the power storage module, and at least a portion of the third projected image may be positioned so as to overlap the cushion member.

[0018] According to the above configuration, even if there are areas where the rigid board is not present as described above, the cushion material is present to fill in these areas, and the cushion material can be made of a material that is cheaper than the rigid board or adhesive, for example, and in this case, the vehicle undercarriage can be manufactured at a lower cost.

[0019] In the above configuration, the rigid board has an overlapping portion that overlaps with the third projected image, and the overlapping portion of the rigid board is not joined to the top plate, and at least a portion of the rigid board other than the overlapping portion may be joined to the top plate.

[0020] According to the above configuration, since there is no adhesive between the overlapping portion of the rigid board and the top plate, it is possible to manufacture the vehicle undercarriage at a lower cost. Furthermore, the absence of adhesive in the non-bonded overlapping portion creates a space. When a load is applied from the upper surface of the floor, the floor deforms, and after the intermediate member and other components deform, the top plate also deforms. By absorbing the displacement associated with this deformation in the space (stroke), it is possible to reduce the load applied to the rigid board.

[0021] In the above disclosure, the rigid board has an overlapping portion that overlaps the third projected image, and the overlapping portion of the rigid board is joined to the top plate, and at least a portion of the rigid board other than the overlapping portion may not be joined to the top plate.

[0022] The above configuration also allows for the manufacture of a vehicle undercarriage at lower cost because no adhesive is used. Furthermore, because the overlapping portion is likely to be located near the occupant's feet, the rigid board can be reinforced by joining the overlapping portion of the rigid board to the top panel. Meanwhile, the portion of the rigid board under the seat that does not overlap with the third projected image (non-overlapping portion) is less likely to be directly subjected to the load caused by the occupant's footsteps. Therefore, by not joining the non-overlapping portion of the rigid board to the top panel, a space is created at this position, which can absorb displacement due to variations in the vertical position of the cross member and the power storage device and relative vibration. [Effects of the Invention]

[0023] According to the present disclosure, a vehicle underbody structure can be obtained that can suppress an increase in the weight of the vehicle underbody structure while ensuring the rigidity of the vehicle underbody structure. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a side view showing a vehicle 1 equipped with a vehicle undercarriage 10 in a first embodiment. [Figure 2]1 is a plan view showing a vehicle interior 13 and a vehicle undercarriage 10 of a vehicle 1 in a first embodiment. [Figure 3] 3 is a cross-sectional view of the vehicle underbody structure 10 in the first embodiment as viewed from the front side of the vehicle 1, and corresponds to a cross-sectional view taken along line III-III in FIG. [Figure 4] 4 is a cross-sectional view of the vehicle underbody structure 10 in the first embodiment as viewed from the left side of the vehicle 1, and corresponds to a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is an enlarged view of a part of FIG. 4. [Figure 6] 5 is an exploded cross-sectional view corresponding to FIG. 4, showing the vehicle underbody structure 10 according to the first embodiment. [Figure 7] 1 is an exploded perspective view of a vehicle underbody structure 10 according to a first embodiment. [Figure 8] 10 is a cross-sectional view showing a vehicle underbody structure 10A according to a second embodiment, and corresponds to FIG. 5 according to the first embodiment. [Figure 9] 10 is a cross-sectional view showing a vehicle underbody structure 10B according to a third embodiment, and corresponds to FIG. 5 according to the first embodiment. [Figure 10] 10 is a cross-sectional view showing a vehicle underbody structure 10C according to a fourth embodiment, and corresponds to FIG. 5 according to the first embodiment. [Figure 11] 10 is a cross-sectional view showing a vehicle underbody structure 10D according to a fifth embodiment, and corresponds to FIG. 5 according to the first embodiment. [Figure 12] 10 is a cross-sectional view showing a vehicle underbody structure 10E according to a sixth embodiment, and corresponds to FIG. 5 according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0025] The following describes embodiments of the present disclosure. In the embodiments described below, when numbers, quantities, etc. are mentioned, the scope of the present disclosure is not necessarily limited to those numbers, quantities, etc., unless otherwise specified. Each component is not necessarily essential to the present disclosure, unless otherwise specified. The same reference numbers are used for the same and corresponding components, and redundant descriptions may not be repeated.

[0026] The arrows F, B, U, D, L, and R in the figures used in the following explanation indicate directions based on the vehicle, with arrow F indicating "forward," arrow B indicating "backward," arrow U indicating "upward," arrow D indicating "downward," arrow L indicating "leftward," and arrow R indicating "rightward."

[0027] [Embodiment 1] (Vehicle 1) A vehicle 1 equipped with a vehicle undercarriage 10 in a first embodiment will be described with reference to Figures 1 to 7. Figure 1 is a side view showing the vehicle 1, and Figure 2 is a plan view showing a passenger compartment 13 of the vehicle 1 and the vehicle undercarriage 10.

[0028] The vehicle 1 is, for example, an electric vehicle that can be driven by a motor, such as an electric vehicle or a hybrid vehicle. The vehicle 1 includes a vehicle interior 13 and a vehicle undercarriage 10.

[0029] (Vehicle undercarriage 10) Fig. 3 is a cross-sectional view of the vehicle underbody structure 10 when viewed from the front side of the vehicle 1, and corresponds to a cross-sectional view taken along line III-III in Fig. 4. Fig. 4 is a cross-sectional view of the vehicle underbody structure 10 when viewed from the left side of the vehicle 1, and corresponds to a cross-sectional view taken along line IV-IV in Fig. 3. Fig. 5 is an enlarged view of a portion of Fig. 4. Fig. 6 corresponds to Fig. 4 and is a cross-sectional view showing an exploded view of the vehicle underbody structure 10. Fig. 7 is an exploded perspective view of the vehicle underbody structure 10.

[0030] As shown in FIGS. 3 to 7 (particularly FIGS. 6 and 7), the vehicle undercarriage 10 includes seats 11 and 12 on which occupants can sit, a floor carpet 14, intermediate members 21 to 23, reinforcing members 31 and 32, a lower frame 15, and an electricity storage device 40.

[0031] (Lower frame 15) The lower frame 15 (FIG. 7) includes a pair of side members 16L, 16R, a front member 16F, a rear member 16B, and cross members 17, 18. The front member 16F extends in the vehicle width direction and connects the front portions of the pair of side members 16L, 16R together. The rear member 16B extends in the vehicle width direction and connects the rear portions of the pair of side members 16L, 16R together. The cross members 17, 18 also extend in the vehicle width direction and connect the middle portions of the pair of side members 16L, 16R together in the fore-and-aft direction of the vehicle.

[0032] In this embodiment, the vehicle undercarriage 10 includes a pair of body frame members, and at least a portion of an intermediate member 21 (first intermediate member) described below is disposed between the pair of body frame members. For example, the pair of body frame members may be any two members selected from a pair of side members 16L, 16R, a front member 16F, and a cross member 17. In this embodiment, the pair of side members 16L, 16R, the front member 16F, and the cross member 17 are arranged in a rectangular frame shape, and a space SP1 (FIGS. 6 and 7) is formed inside these. Similarly, the pair of side members 16L, 16R and the cross members 17, 18 are arranged in a rectangular frame shape, and a space SP2 is formed inside these.

[0033] A pair of side members 16L, 16R, a cross member 18, and a rear member 16B are arranged in a rectangular frame shape, with a space SP3 formed inside them. The vehicle undercarriage 10 does not include a member generally referred to as a floor panel or the like, which is made of a metal steel plate or the like. The vehicle undercarriage 10 penetrates in the vertical direction through the spaces SP1, SP2, and SP3 in the portions where the spaces SP1, SP2, and SP3 are provided.

[0034] (Intermediate parts 21 to 23) The intermediate member 21 (first intermediate member), the intermediate member 22 (second intermediate member), and the intermediate member 23 are made of a material containing, for example, foamed resin, and have a block shape. A sheet 11, which will be described later, is disposed above the intermediate member 21. The intermediate members 21 to 23 are lighter than metal and may be made of a material that is softer than metal. The intermediate members 21 to 23 have approximately the same size and shape as the spaces SP1, SP2, and SP3, respectively. The intermediate members 21 to 23 are disposed so as to fill the spaces SP1, SP2, and SP3, respectively (FIGS. 6 and 7).

[0035] (Floor carpet 14) The floor carpet 14 is a member that forms part of the vehicle interior 13 above the floor carpet 14. As shown in Figures 1 and 2, a pair of seats 11 (first seats) are arranged side by side on the left and right inside the vehicle interior 13 above the floor carpet 14 (above the intermediate member 21), and a seat 12 (second seat) is arranged behind them.

[0036] As shown in Fig. 6, the floor carpet 14 is disposed above the intermediate members 21 to 23. The floor carpet 14 may be disposed so as to be in direct contact with the upper surfaces 21U, 22U, and 23U of the intermediate members 21, 22, and 23. Fixing devices for preventing the floor carpet 14 from moving, anti-slip structures (hook and loop fasteners), and the like may be provided between the floor carpet 14 and the intermediate members 21 to 23 as appropriate. In the vehicle 1 of this embodiment, the floor carpet 14 is formed from a single member, but the floor carpet 14 may also be formed from multiple members.

[0037] (Electricity storage device 40) As shown in FIGS. 3 to 6, the power storage device 40 is disposed below the intermediate members 21 to 23. The power storage device 40 (FIG. 3) includes a power storage module 41 and a case 42. The power storage module 41 is housed in the case 42 and includes a plurality of power storage cells 41C arranged in a horizontal direction. The power storage cells 41C include batteries that store power to be supplied to the motor. The plurality of power storage cells 41C may be stacked in the vehicle width direction or in the vehicle front-to-rear direction.

[0038] Case 42 (FIG. 3) has a top plate 43, an adhesive 44, side walls 45, an internal wall 46, a support member 47, and a bottom plate 48. Top plate 43, a pair of side walls 45, and bottom plate 48 are made of, for example, FRP, and these members form the outer structure of case 42, and adhesive 44, internal wall 46, support member 47, and electricity storage module 41 are arranged within this structure.

[0039] The power storage module 41 (each of the plurality of power storage cells 41C) is joined to the top plate 43 via an adhesive 44. Internal walls 46 are arranged on both outer sides of the power storage module 41 (the plurality of power storage cells 41C) in the stacking direction. The support member 47 has a plate shape and is arranged between the power storage module 41 and the bottom plate 48. The internal walls 46 are integrated with the top plate 43 by a fastener 61, and are also integrated with the bottom plate 48 by a fastener 62.

[0040] Electricity storage device 40 configured as described above is fastened to, for example, side members 16L and 16R of lower frame 15 by a plurality of fasteners 63 (FIG. 3). In this way, electricity storage device 40 is supported by lower frame 15. Seals 51 and 52 (FIGS. 4 and 6) may be arranged between electricity storage device 40 (top plate 43) and lower frame 15 (front member 16F and side member 16R).

[0041] 6, the power storage device 40 is disposed below the intermediate members 21 to 23. The power storage device 40 (top plate 43) may be disposed so as to be in direct contact with the lower surfaces 21D, 22D, and 23D of the intermediate members 21, 22, and 23 (see also FIG. 3).

[0042] (reinforcing members 31, 32) The reinforcing members 31, 32 are made of a material such as GFRP or metal that has higher rigidity than, for example, the intermediate members 21 to 23. In the vehicle undercarriage structure 10, the reinforcing member 31 (first reinforcing member) and the reinforcing member 32 (second reinforcing member) each having a plate-like shape are used. Here, the reinforcing member 31 is disposed on the upper surface 21U of the intermediate member 21, and the reinforcing member 32 is disposed on the upper surface 22U of the intermediate member 22.

[0043] The reinforcing member 31 is provided so as to extend rearward in the vehicle longitudinal direction from the front member 16F. The reinforcing member 31 may be joined to the front member 16F in a detachable or non-detachable manner. Here, the reinforcing members 31, 32 are arranged so as to extend in a planar direction including the vehicle width direction and the vehicle left-right direction.

[0044] The vehicle undercarriage 10 of this embodiment is characterized by having an area below the seat 11 in the vertical direction of the vehicle where the reinforcing member 31 is not provided. For example, even if the seat 11 is projected vertically downward, the projected image does not overlap the reinforcing member 31. Furthermore, even if the seat 12 is projected vertically downward, the projected image does not overlap the reinforcing member 32.

[0045] (Support area 31A) For example, the reinforcing member 31 has a support region 31A (first support region). The support region 31A is defined as follows. That is, as shown in FIG. 2, it defines a right-side reference line 11RC (first right-side reference line) and a left-side reference line 11LC (first left-side reference line) that extend in the vehicle front-rear direction along the right end 11R and left end 11L of the seat 11 in the vehicle width direction. Furthermore, as shown in FIGS. 2 and 5, when the support region 31A of the reinforcing member 31 is projected upward in the vertical direction, a first projection image 31M is formed by the projection. The first projection image 31M is located forward of the front end 11T of the seat 11 and between the right-side reference line 11RC and the left-side reference line 11LC. The reinforcing member 31 has the support region 31A defined as described above.

[0046] (Action and effect) As described above, the vehicle understructure 10 does not include a member generally referred to as a floor panel or the like, which is made of a metal steel plate or the like. The support region 31A of the reinforcing member 31 is an area that is likely to receive the load of an occupant seated in the seat 11. Even if the rigidity of the intermediate member 21 alone is not sufficient to support the load, the presence of the reinforcing member 31 makes it possible for the intermediate member 21 and the reinforcing member 31 to cooperate to support the load of the occupant. In other words, the vehicle understructure 10 of the first embodiment ensures rigidity due to the presence of the reinforcing member 31, while preventing an increase in the weight of the vehicle understructure 10 due to the presence of an area below the seat 11 in the vehicle up-down direction where the reinforcing member 31 is not provided.

[0047] Furthermore, the reinforcing member 31 may have at least the support region 31A defined as described above. With this configuration, it is possible to prevent the weight of the vehicle underbody structure 10 from increasing while ensuring rigidity.

[0048] In the first embodiment described above, the reinforcing member 31 is provided so as to extend rearward in the vehicle longitudinal direction from the front member 16F. The reinforcing member 31 is not limited to being provided on the upper surface 21U of the intermediate member 21, but may be provided so as to be embedded inside the intermediate member 21. The reinforcing member 31 may also be provided at a position spaced apart from the front member 16F. The reinforcing member 31 may be provided, for example, as a bridge between the side members 16L and 16R. At least a portion of the intermediate member 21 is disposed between the pair of body frame members, and the pair of body frame members may be any two members selected from the pair of side members 16L and 16R, the front member 16F, and the cross member 17. When the reinforcing member 31 is joined to the front member 16F or the side members 16L and 16R, the reinforcing member 31 is able to withstand a larger load.

[0049] (reinforcing member 32) 2 and 5, the reinforcing member 32 is provided to extend rearward in the vehicle longitudinal direction from the cross member 17. The reinforcing member 32 may be joined to the cross member 17 in a detachable or non-detachable manner.

[0050] The reinforcing member 32 has a support region 32A (second support region). The support region 32A is defined as follows. That is, as shown in FIG. 2, it defines a right-side reference line 12RC (second right-side reference line) and a left-side reference line 12LC (second left-side reference line) that extend in the vehicle front-rear direction along the right end 12R and left end 12L of the seat 12 in the vehicle width direction. Furthermore, as shown in FIGS. 2 and 5, when the support region 32A of the reinforcing member 32 is projected upward in the vertical direction, a second projection image 32M is formed by the projection. The second projection image 32M is located forward of the front end 12T of the seat 12 and between the right-side reference line 12RC and the left-side reference line 12LC. The reinforcing member 32 has the support region 32A defined as described above.

[0051] The support region 32A of the reinforcing member 32 is an area that is likely to receive the load of an occupant seated in the seat 12. Even if there are cases where the rigidity of the intermediate member 22 alone is not sufficient to receive the load, the presence of the reinforcing member 32 makes it possible for the intermediate member 22 and the reinforcing member 32 to cooperate to receive the load of the occupant. That is, according to the vehicle underbody structure 10 of the first embodiment, the presence of the reinforcing member 32 makes it possible to prevent an increase in the weight of the vehicle underbody structure 10 while ensuring rigidity.

[0052] The reinforcing member 32 is required to have at least the support region 32A defined as described above. This configuration makes it possible to prevent an increase in the weight of the vehicle underbody structure 10 while ensuring rigidity.

[0053] In the first embodiment described above, the reinforcing member 32 is provided to extend rearward in the vehicle longitudinal direction from the cross member 17. The reinforcing member 32 is not limited to being provided on the upper surface 22U of the intermediate member 22, but may be provided so as to be embedded inside the intermediate member 22. The reinforcing member 32 may also be provided at a position spaced apart from the cross member 17. The reinforcing member 32 may be provided, for example, in a bridging manner between the side members 16L and 16R. The reinforcing member 32 may be provided to extend forward in the vehicle longitudinal direction from the cross member 18. If the cross member 18 is not provided, the reinforcing member 32 may be provided to extend forward in the vehicle longitudinal direction from the rear member 16B. When the reinforcing member 32 is joined to these members, the reinforcing member 32 can withstand a larger load.

[0054] [Embodiment 2] FIG. 8 is a cross-sectional view showing a vehicle underbody structure 10A according to the second embodiment, and corresponds to FIG. 5 according to the first embodiment.

[0055] In the above-described embodiment 1, the entire upper surface of the reinforcing member 31 constitutes the support area 31A, and the first projection image 31M formed by projection of the support area 31A is located forward of the front end portion 11T of the seat 11 and between the right reference line 11RC and the left reference line 11LC.

[0056] In this second embodiment, a portion of the upper surface of the reinforcing member 31 constitutes the support region 31A. In other words, when the upper surface of the reinforcing member 31 is projected in the same manner as above, the support region 31A corresponds to the region that is located forward of the front end portion 11T of the seat 11 and between the right reference line 11RC and the left reference line 11LC. With this configuration, it is possible to obtain the same functions and effects as in the first embodiment.

[0057] Similarly, in this second embodiment, a portion of the upper surface of the reinforcing member 32 constitutes the support region 32A. In other words, when the upper surface of the reinforcing member 32 is projected in the same manner as above, the region that corresponds to the portion that is located forward of the front end portion 12T of the seat 12 and between the right reference line 12RC and the left reference line 12LC corresponds to the support region 32A. With this configuration, it is possible to obtain the same functions and effects as in the first embodiment.

[0058] [Embodiment 3] FIG. 9 is a cross-sectional view showing a vehicle underbody structure 10B according to the third embodiment, and corresponds to FIG. 5 according to the first embodiment.

[0059] In the vehicle lower structure 10B, the electricity storage device 40 further includes a rigid board 70. The rigid board 70 can function as a reinforcing member for the top plate 43 that constitutes the case 42 of the electricity storage device 40. The rigid board 70 may be made of a material or structure that has a higher strength than the top plate 43, for example. In the present embodiment, the rigid board 70 has a plurality of board pieces 71 to 73, and each of the plurality of board pieces 71 to 73 is disposed between the top plate 43 and the electricity storage module 41.

[0060] Here, when the reinforcing member 31 is projected downward in the vertical direction, at least a portion of the third projected image 31N formed by the projection is positioned so as not to overlap the rigid board 70 (i.e., the multiple board pieces 71-73). Similarly, when the reinforcing member 32 is projected downward in the vertical direction, at least a portion of the third projected image 32N formed by the projection is positioned so as not to overlap the rigid board 70 (i.e., the multiple board pieces 71-73).

[0061] The fact that the third projection images 31N, 32N of the reinforcing members 31, 32 are positioned so as not to overlap the rigid board 70 means that the rigid board 70 is not present at that position. Even if there are parts where the rigid board 70 is not present as described above, rigidity can be ensured by the presence of the reinforcing members 31, 32. By omitting the presence of the rigid board 70, it is possible to manufacture the vehicle undercarriage at lower cost.

[0062] [Embodiment 4] Fig. 10 is a cross-sectional view showing a vehicle substructure 10C according to the fourth embodiment, and corresponds to Fig. 5 according to the first embodiment. The fourth embodiment can be implemented as a modified example of the third embodiment.

[0063] In the vehicle lower structure 10C, the electricity storage device 40 further includes cushion members 81, 82. The cushion members 81, 82 are disposed between the top plate 43 and the electricity storage module 41. When the reinforcing members 31, 32 are projected downward in the vertical direction, at least a portion of the third projected images 31N, 32N formed by the projection is positioned so as to overlap the cushion members 81, 82.

[0064] In the third embodiment described above, even if there are portions where the rigid board 70 is not present as described above, the cushion members 81, 82 are present to fill in these portions. The cushion members 81, 82 may be made of a material that is cheaper than the rigid board 70 or the adhesive 44, for example. This configuration makes it possible to manufacture the vehicle undercarriage at lower cost.

[0065] [Embodiment 5] Fig. 11 is a cross-sectional view showing a vehicle underbody structure 10D according to the fifth embodiment, and corresponds to Fig. 5 in the first embodiment. The fifth embodiment can be implemented as a modified example of the third embodiment.

[0066] In the vehicle undercarriage 10D, the rigid board 70 has an overlapping portion 70P that overlaps with the third projected images 31N, 32N and a non-overlapping portion 70W that does not overlap with the third projected images 31N, 32N. In other words, when the reinforcing members 31, 32 are projected downward in the vertical direction, the third projected images 31N, 32N formed by the projection are positioned so as to overlap with the overlapping portion 70P of the rigid board 70.

[0067] Here, the overlapping portion 70P of the rigid board 70 is not bonded to the top plate 43, and as shown in FIG. 11 , no adhesive 44 is present between the overlapping portion 70P of the rigid board 70 and the top plate 43. On the other hand, at least a portion (non-overlapping portion 70W) of the rigid board 70 other than the overlapping portion 70P is bonded to the top plate 43. In the present embodiment, substantially the entire rigid board 70 other than the overlapping portion 70P is bonded to the top plate 43. Because no adhesive 44 is present between the overlapping portion 70P of the rigid board 70 and the top plate 43, it is possible to manufacture the vehicle undercarriage at a correspondingly lower cost.

[0068] Furthermore, in the unbonded area of ​​the overlapping portion 70P, a space is formed due to the absence of the adhesive 44. When a load is input from the upper surface of the floor, the floor deforms, and after the intermediate member 21 and the like deform, the top plate 43 also deforms. The displacement accompanying this deformation is absorbed (stroke) by the space, making it possible to reduce the load input to the rigid board 70.

[0069] [Embodiment 6] Fig. 12 is a cross-sectional view showing a vehicle underbody structure 10E according to the sixth embodiment, and corresponds to Fig. 5 according to the first embodiment. The sixth embodiment can be implemented as a modified example of the third embodiment.

[0070] In the vehicle underbody structure 10E, the overlapping portion 70P of the rigid board 70 is bonded to the top plate 43, and as shown in FIG. 12 , an adhesive 44 is present between the overlapping portion 70P of the rigid board 70 and the top plate 43. On the other hand, at least a portion (non-overlapping portion 70W) of the rigid board 70 other than the overlapping portion 70P is not bonded to the top plate 43. In the present embodiment, substantially the entire rigid board 70 other than the overlapping portion 70P is not bonded to the top plate 43. Because no adhesive 44 is present between the non-overlapping portion 70W of the rigid board 70 and the top plate 43, it is possible to manufacture the vehicle underbody structure at a correspondingly lower cost.

[0071] Furthermore, because the overlapping portion 70P is likely to be located near the feet of an occupant, the rigid board 70 can be reinforced by joining the overlapping portion 70P of the rigid board 70 to the top panel 43. On the other hand, the load caused by an occupant stepping on the rigid board 70 is less likely to be directly applied to the portion of the rigid board 70 that does not overlap the third projected image 31N (non-overlapping portion 70W) below the seat 11. Therefore, by not joining the non-overlapping portion 70W of the rigid board 70 to the top panel 43, a space is formed at this position, and this space can absorb displacement due to variations in the vertical position of the cross member 17 and the power storage device 40 and relative vibrations.

[0072] Although the embodiments of the present disclosure have been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0073] 1 vehicle, 10, 10A, 10B, 10C, 10D vehicle undercarriage, 11 seat (first seat), 11L, 12L left end, 11LC left side reference line (first left side reference line), 11R, 12R right end, 11RC right side reference line (first right side reference line), 11T, 12T front end, 12 seat (second seat), 12LC left side reference line (second left side reference line), 12RC right side reference line (second right side reference line), 13 passenger compartment, 14 floor carpet, 15 lower frame, 16B rear member, 16F front member, 16L, 16R side members, 17, 18 cross member, 21 intermediate member (first intermediate member), 21D, 22D, 23D lower surface, 21U, 22U, 23U upper surface, 22 Intermediate member (second intermediate member), 23 intermediate member, 31 reinforcing member (first reinforcing member), 31A support area (first support area), 31M first projection image, 31N, 32N third projection image, 32 reinforcing member (second reinforcing member), 32A support area (second support area), 32M second projection image, 40 energy storage device, 41 energy storage module, 41C energy storage cell, 42 case, 43 top plate, 44 adhesive, 45 side wall, 46 inner wall, 47 support member, 48 bottom plate, 51, 52 seal, 61, 62 fixing device, 63 fastener, 70 rigid board, 70P overlapping portion, 70W non-overlapping portion, 71, 73 board pieces, 81, 82 cushion member, B, D, F, L, R, U arrows, SP1, SP2, SP3 space.

Claims

1. A pair of vehicle body frame members; a first intermediate member at least a portion of which is disposed between the pair of vehicle body frame members; an electricity storage device disposed below the first intermediate member; a first seat disposed above the first intermediate member; a first reinforcing member disposed inside the first intermediate member or on an upper surface of the first intermediate member, a region below the first seat in the vehicle vertical direction where the first reinforcing member is not provided; Vehicle undercarriage.

2. a lower frame including a pair of side members, a front member connecting front portions of the pair of side members together, a rear member connecting rear portions of the pair of side members together, and a cross member connecting intermediate portions of the pair of side members together in the vehicle longitudinal direction; the pair of vehicle body frame members are any two members selected from a pair of side members, the front member, and the cross member, the first intermediate member is disposed so as to fill a space formed inside the pair of side members, the front member, and the cross member, the first reinforcing member has a first support region; a first right-side reference line and a first left-side reference line are defined, each extending in a vehicle longitudinal direction along a right end portion and a left end portion of the first seat in a vehicle width direction, and further, when the first support area is projected upward in a vertical direction, a first projected image formed by the projection is located forward of a front end portion of the first seat and between the first right-side reference line and the first left-side reference line; The vehicle undercarriage structure according to claim 1.

3. The first reinforcing member is provided to extend rearward from the front member in the vehicle longitudinal direction. The vehicle underbody structure according to claim 2.

4. the lower frame includes a plurality of the cross members, the vehicle undercarriage further includes a second intermediate member arranged to fill a space formed inside the pair of side members and the plurality of cross members, the power storage device is disposed below both the first intermediate member and the second intermediate member, the vehicle undercarriage further includes a second seat and a second reinforcing member disposed inside the second intermediate member or on an upper surface of the second intermediate member, the second reinforcing member has a second support region; a second right-side reference line and a second left-side reference line are defined, each extending in the vehicle longitudinal direction along the right end and left end of the second seat in the vehicle width direction, and further, when the second support area is projected upward in the vertical direction, a second projected image formed by the projection is located forward of the front end of the second seat and between the second right-side reference line and the second left-side reference line; The vehicle underbody structure according to claim 2 or 3.

5. The second reinforcing member is provided to extend from any one of the cross members toward the front or rear in the vehicle longitudinal direction. The vehicle underbody structure according to claim 4.

6. The power storage device is a storage module including a plurality of storage cells arranged in a horizontal direction; a case having a top plate and a bottom plate and accommodating the power storage module; a rigid board disposed between the top plate and the power storage module; When the first reinforcing member is projected downward in the vertical direction, at least a part of a third projected image formed by the projection is positioned so as not to overlap the rigid board. The vehicle underbody structure according to claim 2 or 3.

7. the power storage device further includes a cushion member disposed between the top plate and the power storage module; At least a portion of the third projected image is positioned so as to overlap the cushion member. The vehicle underbody structure according to claim 6.

8. the rigid board has an overlapping portion that overlaps the third projected image; The overlapping portion of the rigid board is not joined to the top plate, At least a portion of the rigid board other than the overlapping portion is joined to the top plate. The vehicle underbody structure according to claim 6.

9. the rigid board has an overlapping portion that overlaps the third projected image; The overlapping portion of the rigid board is joined to the top plate, At least a portion of the rigid board other than the overlapping portion is not joined to the top plate. The vehicle underbody structure according to claim 6.

Images