Vehicle lower part structure

Abstract

To improve durability of a power storage device in a vehicle lower part structure.SOLUTION: A vehicle lower part structure 1 includes: a pair of side members 11; extending members 15; a power storage device 20; and supported members 30. Each extending member 15 extends from at least one of the pair of side members 11 between the pair of side members 11. The power storage device 20 is fixed to the pair of side members 11. The power storage device 20 is disposed below the extending members 15. The supported members 30 are fixed to an upper part of the power storage device 20 and supported by the extending parts 15. The power storage device 20 includes fixing parts 25. Fixture of the supported part 30 to the fixing part 25 inhibits downward displacement of the fixing part 25. The supported member 30 is configured to enable upward displacement of the fixing part 25.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] Japanese Patent Application Laid-Open Publication No. 2020-142589 (Patent Document 1) discloses that a battery pack is disposed below a floor panel. [Prior art documents] [Patent documents]

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

[0004] In a vehicle undercarriage, the power storage device may be fixed to a member located above the power storage device. This prevents the power storage device from deforming downward due to its own weight. However, the member prevents the power storage device from bending upward. This prevents the power storage device from dissipating stress caused by vibrations when a vehicle equipped with the vehicle undercarriage is traveling. As such, power storage devices in conventional vehicle undercarriage have low durability.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and has an object to provide a vehicle underbody structure that can improve the durability of an electricity storage device in the vehicle underbody structure. [Means for solving the problem]

[0006] A vehicle understructure according to an aspect of the present disclosure includes a pair of side members, an extension member, an electric storage device, and a supported member. The extension member extends from at least one of the pair of side members between the pair of side members. The electric storage device is fixed to the pair of side members. The electric storage device is disposed below the extension member. The supported member is fixed to an upper portion of the electric storage device and is supported by the extension member. The electric storage device includes a fixed portion. The fixed portion is prevented from displacing downward by the supported member being fixed thereto. The supported member is configured so that the fixed portion can displace upward.

[0007] In a vehicle undercarriage according to an aspect of the present disclosure, the supported member preferably has a pillar portion and a cantilever portion. The pillar portion extends upward from the fixed portion. The cantilever portion extends from the pillar portion in a substantially horizontal direction. The cantilever portion is supported from below by the extension member.

[0008] In the vehicle undercarriage according to an aspect of the present disclosure, the supported member may preferably further include a cushion member disposed between the cantilever beam portion and the extension member.

[0009] In a vehicle undercarriage according to an aspect of the present disclosure, the extension member is preferably a cross member extending from one side member to the other side member of the pair of side members.

[0010] In the vehicle undercarriage structure according to an aspect of the present disclosure, the extension member preferably extends from one of the pair of side members and is spaced apart from the other side member, the pillar portion is aligned with the extension member in the vehicle width direction, and the cantilever portion extends along an upper surface of the extension member.

[0011] In the vehicle undercarriage according to an aspect of the present disclosure, the supported member preferably has an extendable portion, the extendable portion being configured to be variable in length, and the fixed portion being suspended from the extension member by the supported member.

[0012] In the vehicle undercarriage structure according to an aspect of the present disclosure, the supported member is preferably made of an elastic member. The supported member is sandwiched between the fixed portion and the extension member in the up-down direction. [Effects of the Invention]

[0013] According to the present disclosure, the durability of the power storage device in the vehicle undercarriage can be improved. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a side view showing a vehicle equipped with a vehicle undercarriage structure according to a first embodiment. [Figure 2] 1 is a schematic exploded perspective view of a vehicle undercarriage structure according to a first embodiment. [Figure 3] 1 is a cross-sectional view of a vehicle underbody structure according to a first embodiment, as viewed from the front side. [Figure 4] 4 is a cross-sectional view of the vehicle underbody structure of FIG. 3 as viewed in the direction of the arrows along line IV-IV. [Figure 5] FIG. 5 is an enlarged view of a part of FIG. 4. [Figure 6] 3 is a cross-sectional view showing a state in which the electricity storage device is deformed so as to bend upward in the vehicle undercarriage structure according to the first embodiment. FIG. [Figure 7] 4 is a partial cross-sectional view showing a vehicle underbody structure according to a modified example of the first embodiment. FIG. [Figure 8] 10 is a cross-sectional view of a vehicle underbody structure according to a second embodiment, as viewed from the front side. FIG. [Figure 9] 10 is a cross-sectional view showing a state in which the electricity storage device is deformed so as to bend upward in the vehicle undercarriage structure according to the second embodiment. FIG. [Figure 10] FIG. 10 is a partial cross-sectional view showing a vehicle underbody structure according to a modified example of the second embodiment. [Figure 11] 10 is a partial cross-sectional view showing a vehicle underbody structure according to another modified example of the second embodiment. FIG. [Figure 12] 12 is a cross-sectional view of a part of the vehicle undercarriage structure of FIG. 11, as viewed in the direction of the arrows along line XII-XII. [Figure 13] FIG. 10 is a cross-sectional view showing a vehicle underbody structure according to a third embodiment. [Figure 14] 11 is a cross-sectional view showing a state in which the electricity storage device is deformed so as to bend upward in the vehicle undercarriage structure according to the third embodiment. FIG. [Figure 15] FIG. 10 is a cross-sectional view showing a vehicle underbody structure according to a fourth embodiment. [Figure 16] 10 is a cross-sectional view showing a state in which the electricity storage device is deformed so as to bend upward in the vehicle undercarriage structure according to the fourth embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, a vehicle underbody structure according to each embodiment of the present disclosure will be described with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and description thereof will not be repeated.

[0016] In addition, 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."

[0017] (Embodiment 1) 1 is a side view showing a vehicle equipped with a vehicle undercarriage according to embodiment 1. A vehicle 1000 equipped with the vehicle undercarriage 1 according to embodiment 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 1000 includes a passenger compartment 2. The passenger compartment 2 is located above the vehicle undercarriage 1.

[0018] Fig. 2 is a schematic perspective view showing an exploded view of the vehicle underbody structure according to the first embodiment. Fig. 3 is a cross-sectional view of the vehicle underbody structure according to the first embodiment as seen from the front side. Fig. 4 is a cross-sectional view of the vehicle underbody structure of Fig. 3 as seen in the direction of the arrows IV-IV. The cross-sectional view as seen in the direction of the arrows III-III in Fig. 4 corresponds to the cross-sectional view of Fig. 3.

[0019] As shown in FIGS. 2 to 4, the vehicle underbody structure 1 includes a lower frame 10, an electricity storage device 20, and a supported member 30.

[0020] First, a description will be given of the lower frame 10. The lower frame 10 includes a pair of side members 11, one or more cross members 12, a front member 13, and a rear member 14.

[0021] The pair of side members 11 extend in the front-to-rear direction of the vehicle. The pair of side members 11 are located on either side of the center of the vehicle understructure 1 in the vehicle width direction. The pair of side members 11 include a left side member 11L and a right side member 11R. The left side member 11L is located on the left side of the center of the vehicle understructure 1 in the vehicle width direction. The right side member 11R is located on the right side of the center of the vehicle understructure 1 in the vehicle width direction.

[0022] Each of the one or more cross members 12 extends from one side member 11 of the pair of side members 11 to the other side member 11. Each of the one or more cross members 12 extends in a direction perpendicular to the direction in which the pair of side members 11 extend. Specifically, each of the one or more cross members 12 extends along the vehicle width direction. In this embodiment, the lower frame 10 includes multiple cross members 12. The multiple cross members 12 are spaced apart from each other in the vehicle fore-and-aft direction.

[0023] The front member 13 extends in the vehicle width direction and is located forward of the multiple cross members 12. The front member 13 connects the front portions of the pair of side members 11 together.

[0024] The rear member 14 extends in the vehicle width direction and is located rearward of the cross members 12. The rear member 14 connects the rear portions of the pair of side members 11 together.

[0025] Furthermore, the lower frame 10 includes a plurality of extension members 15. In this embodiment, the lower frame 10 includes the cross member 12 as the extension member 15. However, the extension member 15 may be included as a member separate from the cross member 12. In this case, the extension member 15 only needs to be configured to extend from at least one of the pair of side members 11 between the pair of side members 11.

[0026] In this embodiment, the configurations described as being included in the cross member 12 may also be included in the extension member 15. Also, in this embodiment, the configurations of the extension member 15 described below may be included in the cross member 12.

[0027] In this embodiment, the multiple extension members 15 may have the same configuration. Therefore, the detailed configuration of one extension member 15 will be described by focusing on that extension member 15. FIG. 5 is an enlarged view of a portion of FIG. 4. As shown in FIG. 5, the extension member 15 has a top plate portion 151, multiple wall portions 152, and multiple protruding portions 153.

[0028] The top plate portion 151 extends in a substantially horizontal direction. The multiple wall portions 152 extend downward from the top plate portion 151. One of the multiple wall portions 152 extends from the front portion of the top plate portion 151. One of the multiple wall portions 152 extends from the rear portion of the top plate portion 151.

[0029] The multiple protruding portions 153 each extend in either the front-to-rear direction of the vehicle from the lower ends of the multiple wall portions 152. For example, one protruding portion 153 extends further forward from the wall portion 152 extending from the front portion of the top plate portion 151. Another protruding portion 153 extends further rearward from the wall portion 152 extending from the rear portion of the top plate portion 151.

[0030] Next, the electricity storage device 20 will be described. The electricity storage device 20 is fixed to a pair of side members 11 (see FIG. 3). The electricity storage device 20 is also fixed to the front member 13 and the rear member 14 (see FIG. 4). The electricity storage device 20 is not directly fixed to the extension member 15.

[0031] The electricity storage device 20 is disposed below the extension member 15. The electricity storage device 20 is disposed below the front member 13 and the rear member .

[0032] As shown in Fig. 3, the power storage device 20 includes a power storage module 21 and a case 22. The power storage module 21 is housed in the case 22 and includes a plurality of power storage cells 211 arranged in a substantially horizontal direction. The power storage cells 211 include batteries that store power to be supplied to the motor. The plurality of power storage cells 211 may be stacked in the vehicle width direction or in the vehicle front-rear direction.

[0033] The case 22 has an upper plate 221, an adhesive 222, side walls 223, an inner wall 224, a support plate 225, and a bottom plate 226. The upper plate 221, the pair of side walls 223, and the bottom plate 226 are made of, for example, FRP. These members form the outer structure of the case 22. The adhesive 222, the inner wall 224, the support plate 225, and the electricity storage module 21 are arranged within this outer structure.

[0034] The power storage module 21 (each of the plurality of power storage cells 211) is joined to the upper plate 221 via an adhesive 222. Internal walls 224 are arranged on both outer sides of the power storage module 21 (the plurality of power storage cells 211) in the stacking direction. The support plate 225 has a plate-like shape and is arranged between the power storage module 21 and the bottom plate 226. The internal wall 224 is integrated with the upper plate 221 by a fastener 61, and is also integrated with the bottom plate 226 by a fastener 62. A surface pressure distribution board that distributes a load from above the upper plate 221 in a substantially horizontal direction may be arranged between the power storage module 21 and the upper plate 221.

[0035] The electricity storage device 20 configured as described above is fastened to the pair of side members 11 of the lower frame 10 by a plurality of fasteners 63. In this way, the electricity storage device 20 is fixed to the pair of side members 11. Seals 51, 52 may be arranged between the electricity storage device 20 (upper plate 221) and the lower frame 10 (front member 13 and rear member 14) (see FIG. 4).

[0036] 5, the electricity storage device 20 includes a plurality of fixed portions 25. The plurality of fixed portions 25 are portions to which the supported member 30 is fixed. The fixed portions 25 only need to be located at the top of the electricity storage device 20, and the specific members constituting the fixed portions 25 are not particularly limited. In this embodiment, the fixed portions 25 are part of the upper plate 221 of the case 22.

[0037] Note that fixed portion 25 may be the upper portion of power storage module 21. When fixed portion 25 is the upper portion of power storage module 21, an opening may be formed in upper plate 221 located above fixed portion 25. When another member such as a surface pressure distribution board is disposed between upper plate 221 and power storage module 21, fixed portion 25 may be the other member.

[0038] Next, a description will be given of the plurality of supported members 30. The following description will be given of one supported member 30. Each of the plurality of supported members 30 can have the configuration described below.

[0039] 5, the supported member 30 is fixed to the upper part of the electricity storage device 20. The supported member 30 is supported by the extension member 15.

[0040] Specifically, the supported member 30 is fixed to the fixed portion 25 of the electricity storage device 20. In this embodiment, the supported member 30 is fixed to the upper plate 221. The supported member 30 and the fixed portion 25 are fixedly connected to each other by a fixing member 71. The fixing member 71 is a fastener, but may also be an adhesive member.

[0041] The supported member 30 is located on the outer side in the approximately horizontal direction of the extending member 15. In this embodiment, the supported member 30 is located on the front side or rear side of the extending member 15.

[0042] The supported member 30 has a pillar portion 31 and a cantilever portion 32. The pillar portion 31 extends upward from the fixed portion 25. The pillar portion 31 includes a root portion 311 and a main body portion 312 extending upward from the root portion 311. The root portion 311 extends in a substantially horizontal direction. The root portion 311 is in contact with the fixed portion 25. The fixed member 71 is connected to the root portion 311. The main body portion 312 may have a rod-like outer shape or a plate-like outer shape.

[0043] The cantilever beam portion 32 extends in a substantially horizontal direction from the pillar portion 31. The cantilever beam portion 32 extends in a substantially horizontal direction from the upper end of the main body portion 312 of the pillar portion 31.

[0044] The cantilever beam portion 32 is supported from below by the overhanging portion 153 of the extension member 15. The cantilever beam portion 32 is not bonded to the extension member 15. When the cantilever beam portion 32 extends rearward, the cantilever beam portion 32 is supported from below by the overhanging portion 153 that protrudes forward. When the cantilever beam portion 32 extends forward, the cantilever beam portion 32 is supported from below by the overhanging portion 153 that protrudes rearward.

[0045] The material constituting the supported member 30 is not particularly limited. The supported member 30 may be made of, for example, metal. The supported member 30 may be made of a resin material. The supported member 30 may be made of FRP.

[0046] The vehicle undercarriage 1 may further include one or more intermediate members 40. The intermediate member 40 is disposed below the floor carpet 2F that constitutes part of the passenger compartment 2 (see Figures 2 and 3, etc.). The one or more intermediate members 40 are disposed so as to fill each space defined by the pair of side members 11, the one or more cross members 12 (extension members 15), the front member 13, and the rear member 14. The intermediate member 40 is lighter than metal and may be made of a material that is softer than metal. The intermediate member 40 is made of a material that includes, for example, foamed resin. The intermediate member 40 may be in contact with the supported member 30, or may be spaced apart from it.

[0047] Here, the function of the supported member 30 will be described. The supported member 30 configured as described above prevents the fixed portion 25 from being displaced downward. Specifically, the cantilever portion 32 engages with the protruding portion 153 of the extending member 15 located below it, thereby preventing the fixed portion 25 fixed to the supported member 30 from being displaced downward. However, the supported member 30 is also configured so that the fixed portion 25 can be displaced upward. This allows the electricity storage device 20 to deform so as to bend upward.

[0048] This deformation will be described in more detail. Fig. 6 is a cross-sectional view showing a state in which the power storage device is deformed so as to bend upward in the vehicle undercarriage structure according to embodiment 1. Fig. 6 shows a portion corresponding to the portion shown in the cross-sectional view of Fig. 5.

[0049] 5 and 6, when stress acts on the electricity storage device 20 due to vibrations that occur when the vehicle 1000 is traveling, the fixed portion 25 (upper plate 221) tries to deform upward. At this time, the supported member 30 (cantilever portion 32) is displaced upward so as to move away from the extension member 15 (projection portion 153). As a result, the electricity storage device 20 can be deformed so as to bend upward.

[0050] As described above, the vehicle undercarriage 1 includes a pair of side members 11, an extension member 15, the electricity storage device 20, and a supported member 30. The extension member 15 extends between the pair of side members 11 from at least one of the pair of side members 11. The electricity storage device 20 is fixed to the pair of side members 11. The electricity storage device 20 is disposed below the extension member 15. The supported member 30 is fixed to an upper portion of the electricity storage device 20 and is supported by the extension member 15. The electricity storage device 20 includes a fixed portion 25. The fixed portion 25 is prevented from moving downward because the supported member 30 is fixed thereto. The supported member 30 is configured so that the fixed portion 25 can move upward.

[0051] According to the above configuration, supported member 30 can prevent electricity storage device 20 from deforming so as to bend downward due to its own weight. On the other hand, supported member 30 can allow electricity storage device 20 to deform so as to bend upward when vehicle 1000 equipped with vehicle understructure 1 is traveling, etc. Therefore, the durability of electricity storage device 20 in vehicle understructure 1 can be improved.

[0052] Furthermore, in the vehicle undercarriage 1 according to this embodiment, the supported member 30 has a pillar portion 31 and a cantilever portion 32. The pillar portion 31 extends upward from the fixed portion 25. The cantilever portion 32 extends in a substantially horizontal direction from the pillar portion 31. The cantilever portion 32 is supported from below by the extension member 15.

[0053] According to the above configuration, when fixed portion 25 is displaced upward, cantilever portion 32 extending from column portion 31 can be displaced upward so as to move away from extension member 15. Consequently, regardless of the material of supported member 30, supported member 30 can allow deformation such that electricity storage device 20 bends upward.

[0054] Furthermore, in the vehicle underbody structure 1 according to this embodiment, the extension member 15 is a cross member 12 that extends from one side member 11 to the other side member 11 of the pair of side members 11 .

[0055] According to the above configuration, the cross member 12 increases the rigidity of the vehicle undercarriage 1, and the strong cross member 12 supports the supported member 30, thereby further preventing the storage device 20 from bending downward due to its own weight.

[0056] It is not necessary for the supported member 30 and the extending member 15 to be in direct contact with each other. Fig. 7 is a partial cross-sectional view showing a vehicle underbody structure according to a modified example of the first embodiment. Fig. 7 shows a portion corresponding to the portion shown in the cross-sectional view of Fig. 5 in the first embodiment.

[0057] As shown in FIG. 7, the supported member 30 may further include a cushion member 35x disposed between the cantilever portion 32 and the extending member 15.

[0058] After the cantilever beam portion 32 is displaced upward so as to move away from the extension member, the cantilever beam portion 32 is displaced downward and returns to a state in which it is supported by the extension member 15. At this time, according to the above configuration, the cushion member 35x can reduce the load that the extension member 15 receives from the cantilever beam portion 32.

[0059] Specifically, cushion member 35x is disposed between cantilever portion 32 and protruding portion 153. Cushion member 35x is made of a material that is softer than cantilever portion 32 and protruding portion 153. Cushion member 35x may be made of, for example, a rubber-like material or a foamed resin.

[0060] (Embodiment 2) Next, a vehicle understructure according to a second embodiment of the present disclosure will be described. The vehicle understructure according to the second embodiment of the present disclosure differs from the vehicle understructure 1 according to the first embodiment of the present disclosure mainly in that the extension member is not a cross member. Note that the description of the same configuration and effects as those of the vehicle understructure 1 according to the first embodiment will not be repeated.

[0061] Fig. 8 is a cross-sectional view of the vehicle underbody structure according to the second embodiment as seen from the front side. Fig. 8 shows a portion corresponding to the portion shown in the cross-sectional view of Fig. 3 in the first embodiment.

[0062] 8, in a vehicle substructure 1A according to the second embodiment, an extension member 15A extends from one of a pair of side members 11 and is spaced apart from the other side member 11. The pillar portion 31A is aligned with the extension member 15A in the vehicle width direction. The cantilever portion 32A extends along the upper surface of the extension member 15A.

[0063] According to the above configuration, regardless of whether the vehicle underbody structure 1A includes the cross member 12 or not, the supported member 30A can be supported by the extension member 15A.

[0064] The extension member 15A is fixed to the side member 11 by a fastener 73. However, the extension member 15A may be configured integrally with a member that configures the side member 11. For example, the extension member 15A may be a flange portion 111 that protrudes inward in the vehicle width direction on the side member 11. In this embodiment, the extension member 15A is located above the flange portion 111.

[0065] Fig. 9 is a cross-sectional view showing a state in which the power storage device is deformed so as to bend upward in the vehicle undercarriage structure according to embodiment 2. Fig. 9 shows a portion corresponding to a part of the portion shown in the cross-sectional view of Fig. 8.

[0066] 8 and 9, also in the second embodiment, when stress acts on the power storage device 20, the fixed portion 25 (upper plate 221) tries to deform upward. At this time, the supported member 30A (cantilever portion 32A) is displaced upward so as to move away from the extension member 15A. As a result, the power storage device 20 can be deformed so as to bend upward.

[0067] That is, also in the second embodiment, the fixed portion 25 is prevented from being displaced downward by the supported member 30A being fixed thereto. The supported member 30A is configured so that the fixed portion 25 can be displaced upward.

[0068] Also, in embodiment 2, supported member 30A and extending member 15A do not have to be in direct contact with each other. Fig. 10 is a partial cross-sectional view showing a vehicle undercarriage structure according to a modified example of embodiment 2. Fig. 10 shows a portion corresponding to part of the portion shown in the cross-sectional view of Fig. 8 in embodiment 2.

[0069] As shown in FIG. 10, the supported member 30A may further include a cushion member 35x disposed between the cantilever beam portion 32A and the extending member 15A.

[0070] Furthermore, the supported member 30A is not limited to the above configuration. Fig. 11 is a partial cross-sectional view showing a vehicle underbody structure according to another modified example of the second embodiment. Fig. 11 shows a portion corresponding to a part of the portion shown in the cross-sectional view of Fig. 8 in the second embodiment. Fig. 12 is a cross-sectional view of a portion of the vehicle underbody structure of Fig. 11 as seen in the direction of the arrows along line XII-XII.

[0071] As shown in Figures 11 and 12, the supported member 30A may further have a cover wall portion 33yA and a cover bottom portion 34yA. The cover wall portion 33yA extends downward from the cantilever portion 32A. The cover wall portion 33yA covers a portion of at least one of the front and rear sides of the extension member 15A. The cover bottom portion 34yA extends in a substantially horizontal direction from the cover wall portion 33yA. The cover bottom portion 34yA covers a portion of the lower side of the extension member 15A.

[0072] (Embodiment 3) Next, a vehicle underbody structure according to a third embodiment of the present disclosure will be described. The vehicle underbody structure according to the third embodiment of the present disclosure differs from the vehicle underbody structure 1 according to the first embodiment of the present disclosure mainly in the configuration of the supported member. Note that the same configuration and effects as those of the vehicle underbody structure 1 according to the first embodiment will not be described repeatedly.

[0073] Fig. 13 is a cross-sectional view showing a vehicle underbody structure according to a third embodiment. Fig. 13 shows a portion corresponding to the portion shown in Fig. 5 in the first embodiment. Fig. 14 is a cross-sectional view showing a state in which the power storage device is deformed so as to bend upward in the vehicle underbody structure according to the third embodiment. Fig. 14 shows a portion corresponding to the portion shown in the cross-sectional view of Fig. 13.

[0074] As shown in Fig. 13, in a vehicle undercarriage structure 1B according to the third embodiment, a supported member 30B has an extendable portion 36B. The extendable portion 36B is configured so that its length can be changed. A fixed portion 25B is suspended from an extension member 15 by the supported member 30B.

[0075] According to the above configuration, as shown in Fig. 14, contraction of the expandable portion 36B of the supported member 30B allows the supported member 30B to deform so that the electricity storage device 20 bends upward. That is, also in the third embodiment, the fixed portion 25B is prevented from being displaced downward by the supported member 30B being fixed. Specifically, the fixed portion 25B is suspended by the expandable portion 36B that has already been stretched to a predetermined length, and thus the fixed portion 25B is prevented from being displaced downward. The supported member 30B is configured so that the fixed portion 25B can be displaced upward.

[0076] The expandable portion 36B may be configured to be expandable by being made of a member made of a rubber-like material. Also, the expandable portion 36B may be configured to be expandable by being made of a rail member and a slider member that slides on the rail member.

[0077] The supported member 30B further has a pair of engaging portions 37B. The pair of engaging portions 37B are located at both ends of the expandable portion 36B. The pair of engaging portions 37B engage with the fixed portion 25B (upper plate 221) and the extending member 15 (protruding portion 153), respectively. The fixed portion 25B (upper plate 221) and the extending member 15 (protruding portion 153) may be formed with, for example, holes (not shown) for the engaging portions 37B to engage with.

[0078] (Embodiment 4) Finally, a vehicle underbody structure according to a fourth embodiment of the present disclosure will be described. The vehicle underbody structure according to the fourth embodiment of the present disclosure differs from the vehicle underbody structure 1 according to the first embodiment of the present disclosure mainly in the configuration of the supported member. Note that the same configuration as the vehicle underbody structure 1 according to the first embodiment and its effects will not be described again.

[0079] Fig. 15 is a cross-sectional view showing a vehicle underbody structure according to a fourth embodiment. Fig. 15 shows a portion corresponding to the portion shown in Fig. 5 of the first embodiment. Fig. 16 is a cross-sectional view showing a state in which the power storage device is deformed so as to bend upward in the vehicle underbody structure according to the fourth embodiment. Fig. 16 shows a portion corresponding to the portion shown in the cross-sectional view of Fig. 15.

[0080] 15, in a vehicle undercarriage structure 1C according to this embodiment, a supported member 30C is made up of an elastic member 38C. The supported member 30C is sandwiched between a fixed portion 25C and an extension member 15 in the vertical direction.

[0081] According to the above configuration, as shown in Fig. 16, the supported member 30C is elastically deformed and compressed in the vertical direction, so that the supported member 30C can allow the energy storage device 20 to deform so as to bend upward. That is, in the fourth embodiment as well, the fixed portion 25C is prevented from being displaced downward by being fixed to the supported member 30C. Specifically, the fixed portion 25C is prevented from being displaced downward by being fixed to the supported member 30C, which has already been stretched to a predetermined thickness by being elastically deformed. The supported member 30C is configured so that the fixed portion 25C can be displaced upward.

[0082] In the fourth embodiment, the fixed portion 25C is the upper portion of the power storage module 21, but it may be the upper plate 221. In the present embodiment, an elastic member 38C is disposed in a hole formed in the upper plate 221.

[0083] Elastic member 38C may be a rubber-like member or a molded body made of foamed resin. Elastic member 38C and extension member 15 (extension portion 153) are joined to each other by, for example, an adhesive member.

[0084] In the above description of the embodiments, configurations that can be combined may be combined with each other.

[0085] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0086] 1, 1A, 1B, 1C vehicle lower structure, 2 passenger compartment, 2F floor carpet, 10 lower frame, 11 side member, 11L left side member, 11R right side member, 111 flange portion, 12 cross member, 13 front member, 14 rear member, 15, 15A extension member, 151 top plate portion, 152 wall portion, 153 protrusion portion, 20 energy storage device, 21 energy storage module, 211 energy storage cell, 22 case, 221 upper plate, 222 adhesive, 223 side wall, 224 inner wall, 225 support plate, 226 bottom plate, 25, 25B, 25C fixed portion, 30, 30A, 30B, 30C supported member, 31, 31A pillar portion, 311 base portion, 312 Main body portion, 32, 32A cantilever beam portion, 33yA cover wall portion, 34yA cover bottom portion, 35x cushion member, 36B expansion portion, 37B engagement portion, 38C elastic member, 40 intermediate member, 51, 52 seal, 61, 62 fixing device, 63, 73 fastener, 71 fixing member, 1000 vehicle.

Claims

1. A pair of side members; an extension member extending from at least one of the pair of side members between the pair of side members; an electric storage device fixed to the pair of side members and disposed below the extension member; a supported member that is fixed to an upper portion of the power storage device and supported by the extension member, the power storage device includes a fixed portion to which the supported member is fixed and whose downward displacement is suppressed, The supported member is configured so that the fixed portion is displaceable upward.

2. The supported member is a pillar portion extending upward from the fixed portion; a cantilever beam portion extending substantially horizontally from the column portion, The vehicle undercarriage structure according to claim 1 , wherein the cantilever portion is supported from below by the extension member.

3. 3. The vehicle undercarriage structure according to claim 2, wherein the supported member further includes a cushion member disposed between the cantilever beam portion and the extension member.

4. 4. The vehicle underbody structure according to claim 1, wherein the extension member is a cross member extending from one of the pair of side members to the other of the pair of side members.

5. the extension member extends from one of the pair of side members and is spaced apart from the other side member, the pillar portion is aligned with the extension member in the vehicle width direction, The vehicle underbody structure according to claim 2 or 3, wherein the cantilever portion extends along an upper surface of the extension member.

6. The supported member has an expandable portion configured so that its length can be changed, The vehicle undercarriage structure according to claim 1 , wherein the fixed portion is suspended from the extension member by the supported member.

7. The supported member is made of an elastic material, The vehicle underbody structure according to claim 1 , wherein the supported member is sandwiched between the fixed portion and the extension member in the vertical direction.

Images