Vehicle undercarriage

Abstract

To provide a vehicular lower part structure which inhibits falling of attachment brackets during a vehicle side collision while connecting battery units to vehicle body structural components with the attachment brackets.SOLUTION: A vehicle 1 includes: a propeller shaft 9 extending from a transmission 4 to the vehicle rear side; left and right battery units 40L, 40R disposed below floor panels 30 disposed at left and right sides of a floor tunnel 10; and attachment brackets 60L, 60R which are attached to inner surface parts 45L, 45R facing the inner side in a vehicle width direction in the battery units 40L, 40R and connected to a tunnel panel 11 defining the floor tunnel 10. Connection positions P1 between the respective attachment brackets 60L, 60R and the tunnel panel 11 are higher than a height position of the floor panel 30 in a vehicle height direction.SELECTED DRAWING: Figure 8

Description

[Technical field]

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

[0002] An example of a vehicle underbody structure is disclosed in Patent Document 1. Specifically, Patent Document 1 discloses a vehicle equipped with a propeller shaft that extends from the rear end of the transmission toward the rear of the vehicle and transmits power to the rear wheels, and battery packs that are disposed below the floor panels on both the left and right sides of the floor tunnel.

[0003] According to Patent Document 1, the left and right battery packs are arranged with a gap between them in the vehicle width direction. The propeller shaft is laid out so as to be located between the left and right battery packs in the vehicle width direction, more precisely, between the inner side surfaces of the battery packs.

[0004] In addition, an inner bracket for supporting the battery pack is attached to the inner side surface of the battery pack according to Patent Document 1. The inner bracket includes a battery-side fixing portion that is fixed to the inner side surface of the battery pack and a vehicle-side fixing portion that is fixed to the floor panel. By using the inner bracket, the battery pack can be connected to a vehicle body structural component. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-67334 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the configuration disclosed in Patent Document 1 is adopted, the height position of the vehicle body side fixing portion of the inner bracket (hereinafter also referred to as the "mounting bracket") will be approximately the same as the height position of the floor panel in the vehicle height direction, and ultimately the height position of the upper surface of the battery pack.

[0007] In this case, the load input to the vehicle during a side collision is transmitted in two separate loads: a load that propagates toward the inside of the vehicle width along the floor panel, and a load that propagates toward the inside of the vehicle width along the battery pack (hereinafter also referred to as the "battery unit").

[0008] Here, as described in Patent Document 1, if the height position of the vehicle body side fixing part is approximately the same as the height positions of the floor panel and the upper surface of the battery unit, the two loads transmitted in a separated state as described above will both act on the vehicle body side fixing part. If the two loads act in a concentrated manner, there is a concern that the vehicle body side fixing part, and in turn the mounting bracket, may fall off, which is inconvenient.

[0009] The present disclosure has been made in consideration of these points, and its purpose is to connect a battery unit and a vehicle body structural component via a mounting bracket while preventing the mounting bracket from falling off in the event of a vehicle side collision. [Means for solving the problem]

[0010] The first aspect of the present disclosure relates to a lower structure of a vehicle with rear wheels as drive wheels. The vehicle includes a transmission arranged with at least a portion of the rear side of the vehicle inserted into a floor tunnel, a propeller shaft extending from the transmission toward the rear side of the vehicle and transmitting power to the rear wheels, left and right battery units arranged on the underside of the vehicle with respect to floor panels arranged on the left and right sides of the floor tunnel, and mounting brackets attached to inner side surfaces of the battery units facing inward in the vehicle width direction and connected to a tunnel panel that divides the floor tunnel, and the connection position between the mounting brackets and the tunnel panel is higher than the height position of the floor panels in the vehicle height direction. and is closer to the upper end of the tunnel panel than the floor panel in the vehicle height direction. .

[0011] According to the first aspect of the present disclosure, the load input to the vehicle during a vehicle side collision is transmitted in a divided state, that is, a load propagating along the floor panel toward the inside in the vehicle width direction, and a load propagating along the battery unit toward the inside in the vehicle width direction. In this case, if the connection position between the mounting bracket and the tunnel panel is located at the same height as the propagation paths of the two loads, an excessive load acts on this connection position, and there is a concern that the bolts or the like may be sheared. The shearing of the bolts or the like is inconvenient because it may cause the mounting bracket to fall off.

[0012] In contrast, according to the first aspect, the connection position between the mounting bracket and the tunnel panel is set higher in the vehicle height direction than the height position of the floor panel. By setting it in this manner, it is possible to distribute the transmitted load as described above, and in turn to reduce the load acting on the connection position. This makes it possible to prevent the mounting bracket from falling off during a vehicle side collision while connecting the battery unit to a vehicle body structural component such as the floor panel with the mounting bracket.

[0013] A second aspect of the present disclosure relates to a lower structure of a vehicle with rear wheels as drive wheels, the vehicle comprising: a transmission arranged with at least a rear portion of the vehicle inserted into a floor tunnel, a propeller shaft extending from the transmission toward the rear side of the vehicle and transmitting power to the rear wheels, left and right battery units arranged on the vehicle lower side with respect to floor panels arranged on the left and right sides of the floor tunnel, a mounting bracket attached to an inner side surface of the battery unit facing the inside in the vehicle width direction and connected to a tunnel panel that divides the floor tunnel, and a second mounting bracket arranged alongside the mounting bracket along the vehicle front-rear direction and spaced apart from the mounting bracket from the center of gravity of the battery unit in the vehicle front-rear direction, the mounting bracket and the tunnel panel being connected at a higher position in the vehicle height direction than the floor panel, and the mounting bracket and the tunnel panel being connected at a higher position in the vehicle height direction than the second mounting bracket and the tunnel panel being connected at a higher position in the vehicle height direction.

[0014] According to the second aspect, the mounting bracket is closer to the center of gravity of the battery unit than the second mounting bracket. When a load acts from the side near the mounting bracket, the battery unit is not induced to rotate as much as when the load acts near the second mounting bracket. In this case, more kinetic energy is allocated to the translational movement of the battery unit. Therefore, the mounting bracket is subject to stricter collision requirements than the second mounting bracket.

[0015] In contrast, as in the second embodiment, by setting the connection position between the mounting bracket and the tunnel panel relatively high in the vehicle height direction, the load acting on the vehicle during a side collision can be better distributed, and the collision requirements can be more reliably met. On the other hand, by setting the connection position of the second mounting bracket relatively low, the dimension in the vehicle height direction can be set relatively short. This contributes to reducing the weight of the vehicle.

[0016] A third aspect of the present disclosure relates to a lower structure of a vehicle with rear wheels as drive wheels, the vehicle including a transmission arranged with at least a rear portion of the vehicle inserted into a floor tunnel, a propeller shaft extending from the transmission toward the rear side of the vehicle and transmitting power to the rear wheels, left and right battery units arranged on the vehicle lower side with respect to floor panels arranged on the left and right sides of the floor tunnel, and a mounting bracket attached to an inner side surface of the battery unit facing the inside in the vehicle width direction and connected to a tunnel panel that divides the floor tunnel, the mounting bracket having a plate-shaped plate portion extending along the vehicle height direction, a reinforcing rib extending along the vehicle front-rear direction provided on an outer surface of the plate portion, the reinforcing rib being arranged closer to the height position of the floor panel in the vehicle height direction than the connection position of the mounting bracket and the tunnel panel.

[0017] According to the third aspect, by providing the reinforcing ribs in the areas where a larger load is expected to act, it is advantageous in suppressing deformation of the mounting bracket and, in turn, falling off of the mounting bracket.

[0018] In addition, the first aspect of the present disclosure 4 According to this aspect, a connection position between the mounting bracket and the tunnel panel may be higher in a vehicle height direction than a height position of the propeller shaft.

[0019] The above 4 According to this aspect, interference between the propeller shaft and the mounting bracket during a vehicle side collision can be suppressed. This is advantageous in suppressing the mounting bracket from falling off during a vehicle side collision. 。

[0020] In addition, the first aspect of the present disclosure 5 According to this aspect, the vehicle may include an energy absorbing member attached to an outer surface portion of the battery unit facing outward in the vehicle width direction, and the mounting bracket may be positioned closer to the energy absorbing member in the vehicle fore-and-aft direction than the second mounting bracket.

[0021] The above 5 According to this aspect, the energy absorbing member can reduce the load acting on the mounting bracket, which is advantageous in preventing the mounting bracket from falling off in the event of a vehicle side collision.

[0022] In addition, the first aspect of the present disclosure 6 According to this aspect, the inner side surface portion of the battery unit may extend along an inner side surface portion of the inner wall portion of the tunnel panel that faces inward in a vehicle width direction.

[0023] The above 6According to this aspect, it is possible to secure the maximum possible volume for the battery unit. By using the above-mentioned mounting bracket in such a battery unit, it is possible to achieve both a high capacity battery and prevention of the mounting bracket from falling off. 。 Effect of the Invention

[0024] As described above, according to the present disclosure, it is possible to connect a battery unit and a vehicle body structural component by means of a mounting bracket, while preventing the mounting bracket from falling off during a vehicle side collision. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a schematic diagram illustrating a drive system of a vehicle to which a vehicle underbody structure according to the present disclosure is applied. [Figure 2A] FIG. 2A is a plan view illustrating an example of the configuration of the front side of the vehicle as viewed from above. [Figure 2B] FIG. 2B is a bottom view illustrating the configuration of the front side of the vehicle as viewed from below. [Diagram 3] FIG. 3 is a diagram illustrating an example of the configuration inside the floor tunnel as viewed from the right side of the vehicle. [Figure 4] FIG. 4 is a plan view illustrating the configuration around the battery unit as viewed from above the vehicle. [Diagram 5] FIG. 5 is a perspective view illustrating the configuration around the battery unit as viewed obliquely from above. [Figure 6] FIG. 6 is a side view illustrating an example of the layout of the inner bracket. [Figure 7] FIG. 7 is a cross-sectional view illustrating the II cross section of FIG. [Figure 8] FIG. 8 is a cross-sectional view illustrating the cross section taken along line II-II of FIG. [Figure 9] FIG. 9 is a perspective view illustrating an example of the configuration of the first left inner bracket and the first right inner bracket. [Figure 10]FIG. 10 is a side view illustrating the first left inner bracket as viewed from the outside in the vehicle width direction. [Figure 11] FIG. 11 is a side view illustrating the first left inner bracket as viewed from the outside in the vehicle width direction. [Figure 12] FIG. 12 is a cross-sectional view illustrating the cross section taken along line III-III of FIG. [Figure 13] FIG. 13 is a cross-sectional view illustrating the IV-IV cross section of FIG. [Figure 14] FIG. 14 is a perspective view illustrating the second left inner bracket as viewed from the outside in the vehicle width direction. [Figure 15] FIG. 15 is a perspective view illustrating the second left inner bracket as viewed from the inside in the vehicle width direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Note that the following description is merely an example.

[0027] Fig. 1 is a schematic diagram illustrating a drive system of a vehicle 1 to which a vehicle underbody structure according to the present disclosure is applied. Fig. 2A is a plan view illustrating the configuration of the front part of the vehicle 1 as viewed from above, and Fig. 2B is a bottom view illustrating the configuration of the front part of the vehicle 1 as viewed from below.

[0028] In the following description, the terms "front," "rear," "upper," and "lower" are each defined with respect to the vehicle 1. That is, in the following description, "front" refers to the front side in the vehicle's fore-and-aft direction, and "rear" refers to the rear side in the vehicle's fore-and-aft direction. Similarly, "upper" refers to the upper side in the vehicle height direction, and "lower" refers to the lower side in the vehicle height direction. In the following description, the vehicle's fore-and-aft direction may be simply referred to as the "fore-and-aft direction," the vehicle height direction may be simply referred to as the "up-and-down direction," and the vehicle width direction may be simply referred to as the "left-and-right direction."

[0029] Additionally, the terms "left" and "right" in the following description are also defined with respect to the vehicle 1. That is, in the following description, "left" refers to the left side in the vehicle width direction when the vehicle 1 is viewed from the rear to the front, and "right" refers to the right side when the vehicle is viewed from the rear to the front.

[0030] (Overall composition) The vehicle 1 illustrated in FIG. 1 is a hybrid vehicle. In detail, as shown in FIG. 1, the vehicle 1 includes an engine 2 and a motor 3 as a driving source (powertrain), and a transmission 4 that changes the speed of the driving force transmitted from at least one of the engine 2 and the motor 3 and transmits it. The engine 2 is accommodated in an engine room disposed forward of the passenger compartment. The engine 2 is vertically disposed in the engine room at a position approximately in the center in the vehicle width direction. The motor 3 is disposed behind the engine 2 via a damper 5. The transmission 4 is vertically disposed behind the motor 3.

[0031] Although the engine 2 and motor 3 constituting the powertrain are disposed at the front of the vehicle in the fore-and-aft direction, the charger for the motor 3 is disposed at the rear of the vehicle in the fore-and-aft direction. As a result, the center of gravity position G1 of the vehicle 1 in the fore-and-aft direction is slightly forward of the midpoint of the vehicle 1 in the fore-and-aft direction (specifically, near the B-pillar) (see FIG. 4).

[0032] The vehicle 1 is a vehicle in which at least the left and right rear wheels 7 are drive wheels. More specifically, the vehicle 1 is configured as a four-wheel drive vehicle in which both the left and right front wheels 6 and the left and right rear wheels 7 are drive wheels. A rear portion of the transmission 4 is a transfer 4a for transmitting driving force to the front wheels 6 and the rear wheels 7. A front propeller shaft 8 extends from the transfer 4a toward the front side. A rear propeller shaft 9 extends from the transfer 4a toward the rear side. The front propeller shaft 8 is disposed slightly to the right of the center in the vehicle width direction. The rear propeller shaft 9 is disposed approximately in the center in the vehicle width direction. Although details are omitted, the driving force changed by the transmission 4 is transmitted to the front propeller shaft 8 and the rear propeller shaft 9 by the transfer 4a. The front propeller shaft 8 transmits driving force to the front wheels 6, and the rear propeller shaft 9 transmits driving force to the rear wheels 7.

[0033] 2B, the transmission 4 is disposed with at least a portion of the transmission 4 on the rear side of the vehicle inserted into the floor tunnel 10. More specifically, the transmission 4 is disposed so as to incline downward from the front side to the rear side.

[0034] As shown in Fig. 2A, the floor tunnel 10 is formed by a tunnel panel 11. As shown in Fig. 3, the upper end of the tunnel panel 11 is inclined downward from the front side to the rear side. Therefore, the floor tunnel 10 becomes narrower in the vertical direction toward the rear side.

[0035] A rear propeller shaft 9 is disposed within the floor tunnel 10. The rear propeller shaft 9 is connected to the transfer 4a via a rubber cup 4b. The rear propeller shaft 9 extends from the position of the rubber cup 4b, inclining downward toward the rear. A universal joint 9a is provided at a midpoint in the front-to-rear direction of the rear propeller shaft 9. In the event of a frontal collision, for example, the rear propeller shaft 9 is adapted to bend in the up-down and left-right directions starting from the universal joint 9a.

[0036] The rear propeller shaft 9 according to this embodiment is divided into two in the front-rear direction by a universal joint 9a. Specifically, the rear propeller shaft 9 has, in order from the front side of the vehicle, a first shaft portion 9b connected to the transmission 4, and a second shaft portion 9c connected to the first shaft portion 9b via the universal joint 9a.

[0037] Another rubber cup is provided in front of the universal joint 9a of the rear propeller shaft 9. A support bracket 9d that supports the rear propeller shaft 9 is provided at the position of the rubber cup. The support bracket 9d has a U-shape that covers the rubber cup from below, and its left and right ends are connected with bolts to reinforcing upper tunnel rains 12 provided on the tunnel panel 11.

[0038] Side tunnel reins 13 extending in the front-rear direction are provided on the left and right ends of the tunnel panel 11. Each side tunnel rein 13 is a member for reinforcing the tunnel panel 11. Each side tunnel rein 13 is connected by welding to the inner part of the tunnel panel 11 so as to form a closed cross section between itself and the tunnel panel 11.

[0039] A pair of left and right floor panels 30 constituting the vehicle interior floor are disposed on the left and right sides of the tunnel panel 11, respectively. The floor panels 30 extend horizontally along the front-rear and left-right directions. As shown in FIG. 7, the right end of the left floor panel 30 is connected to the left end of the tunnel panel 11 by welding. Although not shown, the left end of the right floor panel 30 is connected to the right end of the tunnel panel 11 by welding. The left and right floor panels 30 are connected to the left and right sides by the tunnel panel 11. The connection portions between each floor panel 30 and the tunnel panel 11 are located at the same positions as the connection portions between the tunnel panel 11 and the side tunnel rain 13, or are located outside the connection portions in the vehicle width direction.

[0040] As shown in FIG. 2B, the left and right toe boards 32 are connected to the front ends of the left and right floor panels 30 by welding, respectively, on the left and right sides. The left and right toe boards 32 extend from the front ends of the left and right floor panels 30 so as to incline upward toward the front side. The upper ends of the left and right toe boards 32 are joined to the lower end of a dash panel (not shown) that separates the passenger compartment from the engine room. The right end of the left toe board 32 is connected to the left end of the tunnel panel 11 by welding. The left end of the right toe board 32 is connected to the right end of the tunnel panel 11 by welding.

[0041] 2B, a pair of left and right floor frames 21 extending in the front-rear direction are connected to the lower surfaces of the left and right floor panels 30 and the lower surfaces of the left and right toe boards 32. The left and right floor frames 21 extend at an incline toward the outside in the vehicle width direction toward the rear so as to be spaced apart from each other in the vehicle width direction, and then extend straight toward the rear so as to be parallel to each other.

[0042] 7 and 8, a pair of left and right side sills 22 extending in the front-rear direction are connected to the outer ends of the left and right floor panels 30 in the vehicle width direction. The left and right side sills 22 are respectively located outboard in the vehicle width direction than the left and right floor frames 21. The left side sill 22 is connected to the left end of the left floor panel 30 by welding. The right side sill 22 is connected to the right end of the right floor panel 30 by welding.

[0043] As shown in FIG. 2, the front end portions of the left and right floor frames 21 and the front end portions of the left and right side sills 22 are connected to each other on the left side and right side by left and right gussets 23, respectively.

[0044] 1 and 2B, in the area behind the transfer 4a, battery units 40L, 40R storing power for driving the motor 3 are arranged separately on the left and right sides of the floor tunnel 10. In particular, the battery units 40L, 40R according to this embodiment are arranged on the lower side of the vehicle with respect to the floor panels 30 arranged on the left and right sides of the floor tunnel 10, as shown by the dashed lines in FIG. 2A.

[0045] Here, the left battery unit 40L is disposed below the passenger seat, and the right battery unit 40R is disposed below the driver's seat. The left and right battery units 40L, 40R are electrically connected to each other by connectors. As shown in FIG. 2A, the right end of the left battery unit 40L and the left end of the right battery unit 40R slightly overlap with the floor tunnel 10 when viewed from above or below along the vertical direction.

[0046] Both the left and right battery units 40L, 40R extend in the vehicle front-rear direction so as to pass through the center of gravity G1 of the vehicle 1. Specifically, the center of gravity G1 of the vehicle 1 is configured to be located between the front end and the rear end of the left and right battery units 40L, 40R in the vehicle front-rear direction (see the chain line L1 in FIG. 4). By arranging them in this manner, the center of gravity G2 of each of the left and right battery units 40L, 40R and the center of gravity G1 of the vehicle 1 are close to each other in the vehicle front-rear direction.

[0047] Both the left and right battery units 40L, 40R extend in the vehicle width direction toward the side end portion (side sill 22) of the vehicle 1. Both the left and right battery units 40L, 40R extend to the vicinity of the side end portion of the vehicle 1. Specifically, the left and right battery units 40L, 40R face the side sill 22 with the floor frame 21 between them.

[0048] 2B, a mission support member 33 that supports the transfer 4a (i.e., the transmission 4) is provided slightly forward of the left and right battery units 40L, 40R. The mission support member 33 is disposed so as to face the front portions 43L, 43R of the battery units 40L, 40R.

[0049] As shown in FIG. 2B, an exhaust pipe 28 through which exhaust gas from the engine 2 passes is disposed on the right side of the mission support member 33. The exhaust pipe 28 extends from the engine 2 toward the floor tunnel 10, bypassing the right side of the transmission 4 and the mission support member 33, and then extends through the floor tunnel 10 toward the rear. The exhaust pipe 28 has an exhaust purification device 29 on the right side of the mission support member 33. The exhaust purification device 29 has a horizontally elongated elliptical shape and has an exhaust purification catalyst 29a therein. The exhaust pipe 28 is configured to enter the floor tunnel 10 through between the front part 43R of the right battery unit 40R and the mission support member 33 at the same height position as the front part 43R of the right battery unit 40R and the mission support member 33.

[0050] Next, the peripheral configuration of the left battery unit 40L and the right battery unit 40R will be described in detail.

[0051] (Configuration Related to Left Battery Unit 40L) First, the peripheral configuration of the left battery unit 40L will be described. As shown in Fig. 2B and Fig. 4 to Fig. 6, the left battery unit 40L has a box shape and is substantially rectangular when viewed from the bottom.

[0052] In detail, the left battery unit 40L has a left front portion 43L, a left outer side portion 44L extending in the fore-and-aft direction from the outer end of the left front portion 43L in the vehicle width direction, a left inner side portion 45L extending in the fore-and-aft direction from the inner end of the left front portion 43L in the vehicle width direction, a left upper side portion 46L extending horizontally from the upper end of the left front portion 43L toward the rear of the vehicle, a left lower side portion 47L extending from the lower end of the left front portion 43L opposite the left upper side portion 46L in the vertical direction, and a left rear side portion 48L opposite the left front portion 43L in the fore-and-aft direction.

[0053] The edges of the respective surface portions 43L to 48L of the left battery unit 40L are integral with each other. The left front portion 43L has an inner portion in the vehicle width direction positioned rearward of an outer portion in the vehicle width direction. This allows the left battery unit 40L to be as large as possible while providing a space for arranging the mission support member 33.

[0054] Moreover, the left battery unit 40L according to this embodiment is configured by fastening a pair of upper and lower case members. In detail, as shown in Figs. 7 and 8, the left battery unit 40L has a first left case 41L and a second left case 42L that are divided in the vertical direction. The first left case 41L is a case member including a left upper surface portion 46L and is located relatively on the upper side. The second left case 42L is a case member including a left lower surface portion 47L and is located relatively on the lower side.

[0055] Moreover, the left battery unit 40L according to this embodiment is configured to ensure its volume as large as possible. Specifically, the left outer side surface portion 44L of the left battery unit 40L extends along the inner side surface portion 11a of the inner wall portion of the tunnel panel 11 that faces the inside in the vehicle width direction. In other words, in the vehicle width direction, the left outer side surface portion 44L is disposed at approximately the same position as the inner side surface portion 11a of the tunnel panel 11 (see FIG. 8).

[0056] The first left case 41L and the second left case 42L are each formed in a box shape that opens toward the upper or lower side of the vehicle, and have flanges 41aL, 42aL provided along the periphery of the opening. In detail, the first left case 41L has a flange 41aL at its lower end that extends along the edge, and the second left case 42L has a flange 42aL at its upper end that extends along the edge.

[0057] The first left case 41L and the second left case 42L as case members can be fastened to each other by inserting bolts (fasteners) into the flanges 41aL and 42aL. More specifically, the first left case 41L and the second left case 42L are connected by bolts with the flanges 41aL and 42aL butted against each other in the vertical direction. A seal member is disposed at the contact portion between the first left case 41L and the second left case 42L.

[0058] The left battery unit 40L is connected to vehicle body structural components via multiple mounting brackets 51L, 52L. The mounting brackets 51L, 52L according to this embodiment are attached to a left outer side surface portion 44L of the left battery unit 40L that faces the outside (left side) in the vehicle width direction, and a left inner side surface portion 45L of the left battery unit 40L that faces the inside (right side) in the vehicle width direction, respectively.

[0059] Specifically, a left outer bracket 52L serving as a mounting bracket is attached to the left outer side surface portion 44L of the left battery unit 40L (see FIGS. 1, 2B, and 4). This left outer bracket 52L connects the left battery unit 40L to the floor panel 30. Similarly, a left inner bracket 51L serving as a mounting bracket is attached to the left inner side surface portion 45L of the left battery unit 40L (see FIGS. 1 to 6). This left inner bracket 51L connects the left battery unit 40L to the tunnel panel 11.

[0060] The vehicle 1 according to this embodiment includes a pipe 24 extending in the front-rear direction of the vehicle. A fluid for cooling the charger arranged on the rear side of the vehicle flows through this pipe 24. In this embodiment, the pipe 24 is arranged below the left outer bracket 52L.

[0061] The left outer bracket 52L is disposed in a plurality of positions spaced apart from one another in the vehicle front-rear direction. Here, the left outer bracket 52L according to the present embodiment includes at least a first left outer bracket 80L extending along the vehicle front-rear direction.

[0062] The first left outer bracket 80L extends along the vehicle front-rear direction so as to pass through the center of gravity G2 of the left battery unit 40L in the vehicle front-rear direction. In detail, as shown in Fig. 1, the front end of the first left outer bracket 80L is disposed on the vehicle front side of the center of gravity G2 of the left battery unit 40L, and the rear end of the first left outer bracket 80L is disposed on the vehicle rear side of the center of gravity G2 of the left battery unit 40L (see the chain line in Fig. 4). In the example shown in Fig. 2, the first left outer bracket 80L is attached to the left outer side surface portion 44L at a middle position in the front-rear direction.

[0063] Specifically, the left side outer bracket 52L in this embodiment includes the first left side outer bracket 80L described above and a second left side outer bracket 90L that is positioned rearward of the first left side outer bracket 80L in the vehicle fore-and-aft direction.

[0064] Of these, the first left outer bracket 80L extends along the vehicle front-rear direction so as to pass through the center of gravity G2 of the left battery unit 40L in the vehicle front-rear direction. More specifically, as shown in Fig. 1, the front end of the first left outer bracket 80L is disposed on the vehicle front side of the center of gravity G2 of the left battery unit 40L, and the rear end of the first left outer bracket 80L is disposed on the vehicle rear side of the center of gravity G2 of the left battery unit 40L. In the example shown in Fig. 2, the first left outer bracket 80L is attached to the left outer side surface portion 44L at a middle position in the front-rear direction.

[0065] Although not shown in the drawings, a lower portion of the first left outer bracket 80L is attached to the second left case 42L with a bolt. An upper end portion of the first left outer bracket 80L is fixed to the lower surface of the left floor frame 21 with a bolt.

[0066] 8, an energy absorbing member 85 is provided integrally with the first left outer bracket 80L. The energy absorbing member 85 defines a closed cross section in a cross section perpendicular to the vehicle front-rear direction. The energy absorbing member 85 is provided integrally with the first left outer bracket 80L from the front end to the rear end.

[0067] On the other hand, the second left outer bracket 90L is attached to the rear end position of the left outer side surface portion 44L. Although not shown, the lower part of the second left outer bracket 90L is attached to the second left case 42L with a bolt. The upper end part of the second left outer bracket 90L is fixed to the lower surface of the left floor frame 21 with a bolt.

[0068] The left inner bracket 51L is arranged in a plurality of positions spaced apart in the vehicle front-rear direction. Here, the left inner bracket 51L according to this embodiment includes a first left inner bracket 60L and a second left inner bracket 70L arranged alongside the first left inner bracket 60L in the vehicle front-rear direction and positioned rearward of the first left inner bracket 60L.

[0069] Among these, the first left inner bracket 60L is disposed closer to the vehicle front side than the universal joint 9a, and is disposed closer to the transmission 4 than the second left inner bracket 70L. More specifically, the first left inner bracket 60L is disposed closer to the center of gravity G2 of the left battery unit 40L in the vehicle longitudinal direction than the second left inner bracket 70L. In other words, as shown in FIG. 1, the first left inner bracket 60L is disposed closer to the first left outer bracket 80L than the second left outer bracket 90L in the vehicle longitudinal direction. By disposing in this way, the first left inner bracket 60L as the mounting bracket is disposed closer to the energy absorbing member 85 in the vehicle longitudinal direction than the second left inner bracket 70L as the second mounting bracket. In the example shown in FIG. 2, the first left inner bracket 60L is configured to cover the front portion of the left inner side surface portion 45L from the inside in the vehicle width direction.

[0070] The first left inner bracket 60L functions as a mounting bracket for connecting the left battery unit 40L to vehicle body components, and also functions as a protector that covers the left inner side surface portion 45L from the inside in the vehicle width direction. The first left inner bracket 60L is a member that prevents the transfer 4a from contacting the left inner side surface portion 45L of the left battery unit 40L when the transmission 4 together with the transfer 4a enters the floor tunnel 10 during a frontal collision. The left inner protector 70L is made of, for example, cast iron.

[0071] 7 to 10, the first left inner bracket 60L has a left plate portion 61L that actually covers the left inner side surface portion 45L, and a left vehicle body connecting portion 62L that is connected to a vehicle body constituent member. The left vehicle body connecting portion 62L is provided on the upper end portion of the left plate portion 61L.

[0072] The left plate portion 61L covers the portion of the left inner side surface portion 45L that corresponds to the first left case 41L. As shown in Figs. 6, 9 and 10, the left plate portion 61L has a gradually narrower width in the front-rear direction toward the upper side. Specifically, the front end portion of the left plate portion 61L is inclined rearward toward the left vehicle body connecting portion 62L, while the rear end portion of the left plate portion 61L extends straight upward, curves forward, and then extends at an incline toward the left vehicle body connecting portion 62L. Therefore, the left vehicle body connecting portion 62L has a smaller width in the front-rear direction of the vehicle than the left plate portion 61L.

[0073] As shown in Figs. 7 and 8, the inner surface (ie, the right surface) of the left plate portion 61L in the vehicle width direction is located at approximately the same position as the inner ends of the upper and lower flanges 41aL, 42aL in the vehicle width direction.

[0074] As shown in FIG. 7 and FIG. 9 to FIG. 10, the surface of the left plate portion 61L on the outer side in the vehicle width direction (i.e., the left surface) is provided with two left attachment portions 63L for attaching the first left inner bracket 60L to the left battery unit 40L. The left attachment portions 63L are provided at the front and lower end and the rear and lower end of the left plate portion 61L, respectively. A bolt 102 (shaft-shaped fastening member) is inserted into each left attachment portion 63L so as to extend in the vertical direction. As shown in FIG. 7, the bolt 102 is fastened to the upper and lower flanges 41aL, 42aL while extending in the vertical direction (only the rear left attachment portion 63L is shown in FIG. 7). As a result, the first left inner bracket 60L is fixed to the upper and lower flanges 41aL, 42aL of the left battery unit 40L. With this fixation, the first left inner bracket 60L is attached to the left battery unit 40L via the flange 42aL.

[0075] A plurality of reinforcing ribs are provided on the outer surface in the vehicle width direction of the left plate portion 61L (i.e., the outer surface facing the left side). The reinforcing ribs include a plurality (five in this case) of left vertical ribs 64L extending in the vehicle height direction and one left horizontal rib 65L extending in the vehicle front-rear direction. Each left vertical rib 64L becomes wider as it approaches the left horizontal rib 65L. The left vertical rib 64L located at the frontmost position among the plurality of left vertical ribs 64L is integrated with the front left mounting portion 63L. The left vertical rib 64L located at the rearmost position among the plurality of left vertical ribs 64L is integrated with the rear left mounting portion 63L.

[0076] The left lateral rib 65L extends straight forward from the rearmost left vertical rib 64L through the vertical middle portion of the left vertical rib 64L, and then extends along the front end of the left plate portion 61L to be integrated with the upper end of the frontmost left vertical rib 64L. The left lateral rib 65L is integrated with each left vertical rib 64L. As shown in FIG. 8, the left lateral rib 65L is located at substantially the same height as the floor panel 30. The left lateral rib 65L protrudes outward in the vehicle width direction from the left vertical rib 64L, and its tip is located near the tunnel panel 11.

[0077] As shown in Figures 7 to 10, the left vehicle body connection part 62L extends upward from the upper end part of the left plate part 61L, and then curves at a substantially right angle and extends toward the inside in the vehicle width direction. The left vehicle body connection part 62L is fixed to the upper tunnel rain 12 with a bolt 103. As shown in Figure 8, the bolt 103 is fastened to a weld nut provided on the upper tunnel rain 12 in a vertically extending position. With this fastening, the first left inner bracket 60L is connected to the tunnel panel 11 via the upper tunnel rain 12.

[0078] The left side mounting portions 63L are attached to the left side battery unit 40L, and the left side vehicle body connection portion 62L is connected to the tunnel panel 11, so that the left side battery unit 40L is supported on the vehicle body via the first left side inner bracket 60L. In other words, the first left side inner bracket 70L functions both as a protector and as a mounting bracket.

[0079] Also, as shown in Figures 7 and 8, when each left side mounting portion 63L is attached to the left side battery unit 40L and the left side vehicle body connection portion 62L is connected to the tunnel panel 11, the first left side inner bracket 60L extends upward from the upper surface of the lower flange 42aL (the portion to which each left side mounting portion 63L is connected) to the lower surface of the upper tunnel rain 12 (the portion to which the left side vehicle body connection portion 62L is connected).

[0080] In this embodiment, the connection position P1 between the first left inner bracket 60L as a mounting bracket and the tunnel panel 11 (specifically, the connection position between the left vehicle body connection portion 62L and the upper tunnel rain 12, where the bolt 103 is fastened) is higher in the vehicle height direction than the height position of the floor panel 30, as shown in Fig. 8. In more detail, the connection position P1 between the first left inner bracket 60L and the tunnel panel 11 is disposed closer to the upper end of the tunnel panel 11 than the floor panel 30 in the vehicle height direction, when viewed in a cross section perpendicular to the vehicle front-rear direction.

[0081] 7 and 8, the first shaft portion 9b of the rear propeller shaft 9, which is located further forward of the vehicle than the universal joint 9a, is disposed above the left battery unit 40L in the vehicle height direction when viewed at least in a cross section passing through the left plate portion 61L. A connection position P1 between the first left inner bracket 60L as a mounting bracket and the tunnel panel 11 is higher in the vehicle height direction than the height position of the rear propeller shaft 9, more specifically, the height position of the first shaft portion 9b.

[0082] Also, as shown in FIG. 8, the left lateral rib 65L as a reinforcing rib is positioned closer to the height position of the floor panel 30 in the vehicle height direction than the connection position P1 between the first left inner bracket 60L and the tunnel panel.

[0083] Also, as shown in FIG. 8, the left side lateral rib 65L as a reinforcing rib is positioned in the vehicle height direction so as to be closer to the height position of the left side upper surface portion 46L as the upper surface portion of the left side battery unit 40L than the connection position P1 between the first left side inner bracket 60L and the tunnel panel.

[0084] Also, as shown in FIG. 8, the first left inner bracket 60L is positioned so that the portion located below the left lateral rib 65L covers the left inner side surface portion 45L from the inside in the vehicle width direction, while the portion located above the left lateral rib 65L covers the tunnel panel 11 from the inside in the vehicle width direction.

[0085] The second left inner bracket 70L is arranged alongside the first left inner bracket 60L along the vehicle front-rear direction, and is arranged farther away from the center of gravity G2 of the left battery unit 40L in the vehicle front-rear direction than the first left inner bracket 60L. Specifically, the second left inner bracket 70L according to this embodiment is arranged on the vehicle rear side than the universal joint 9a. Also, as shown in FIG. 3, the second left inner bracket 70L is closer to the universal joint 9a than the first left inner bracket 60L in the vehicle front-rear direction. As shown in FIG. 4 and other figures, the first left inner bracket 60L is arranged at an intermediate position between the first left outer bracket 80L and the second left outer bracket 90L in the vehicle front-rear direction.

[0086] The second left inner bracket 70L is configured as a plate-shaped protector that covers a portion of the left inner side surface portion 45L that is located rearward of the vehicle relative to the universal joint 9a. The second left inner bracket 70L functions when the transmission 4 together with the transfer 4a enters the floor tunnel 10 during a frontal collision and is bent in the left-right direction starting from the universal joint 9a. In this case, the second left inner bracket 70L exerts its function as a member for suppressing contact between the universal joint 9a and the left inner side surface portion 45L of the left battery unit 40L. The left inner protector 70L is configured, for example, of a high-tensile steel plate part.

[0087] As shown in Fig. 4, the dimension of the second left inner bracket 70L in the vehicle front-rear direction is longer than the dimension of the universal joint 9a in the vehicle front-rear direction. Also, as shown in Fig. 12 and Fig. 13, the dimension of the second left inner bracket 70L in the vehicle height direction is longer than the length of the side surface portion of the left inner side surface portion 45L defined by the upper first left case 41L.

[0088] Specifically, the second left inner bracket 70L as a protector, as illustrated in Figures 12 to 15, has plate portions 71, 72 extending along the vehicle fore-and-aft direction and vehicle height direction, a first mounting portion 73 provided on the peripheral portion 71a of the plate portion 71 and connected to a body component of the vehicle 1 (more specifically, the tunnel panel 11), and two second mounting portions 74, 74 provided on the peripheral portion 71a of the plate portion 71 and connected to the left battery unit 40L.

[0089] The plate portions 71, 72 are made of two plate-like bodies stacked in the vehicle width direction. Of the two plate-like bodies, the first plate portion 71 located on the inner side in the vehicle width direction is formed in a rectangular shape whose dimension in the vehicle front-rear direction is longer than that in the vehicle height direction. Of the two plate-like bodies, the second plate portion 72 located on the outer side in the vehicle width direction is formed in a rectangular shape having approximately the same dimensions as the first plate portion 71. The first plate portion 71 and the second plate portion 72 are joined together by, for example, welding.

[0090] Each of the two plate-like bodies constituting the plate portions 71 and 72 is provided with a bead portion extending along the vehicle longitudinal direction. Specifically, of the two plate-like bodies, the bead portion provided on the first plate portion 71 located on the inner side in the vehicle width direction constitutes a first bead portion 71b protruding toward the inside in the vehicle width direction. This first bead portion 71b is composed of a plurality of bead shapes arranged along the vertical direction. As shown in Figs. 12 to 14, each of the first bead portions 71b has a shape that extends along the vehicle longitudinal direction and protrudes toward the inside in the vehicle width direction. In other words, each of the first bead portions 71b has a concave cross-sectional shape that is recessed toward the inside in the vehicle width direction when viewed in a cross section perpendicular to the vehicle longitudinal direction.

[0091] On the other hand, of the two plate-like bodies, the bead portion provided on the second plate portion 72 located on the outer side in the vehicle width direction constitutes a second bead portion 72b protruding outward in the vehicle width direction. This second bead portion 72b is composed of a plurality of bead shapes arranged along the up-down direction. As shown in Figs. 12 to 13 and 15, each second bead portion 72b has a shape that extends along the vehicle front-rear direction and protrudes outward in the vehicle width direction. In other words, each second bead portion 72b has a concave cross-sectional shape that is recessed outward in the vehicle width direction when viewed in a cross section perpendicular to the vehicle front-rear direction.

[0092] 12 and 13, the first bead portion 71b and the second bead portion 72b are disposed to face each other. Therefore, when viewed in a cross section perpendicular to the vehicle front-rear direction, the first bead portion 71b and the second bead portion 72b define a closed cross section extending along the vehicle front-rear direction.

[0093] Additionally, a peripheral portion 71a of the first plate portion 71 is bent toward the inside in the vehicle width direction along the contour of the first plate portion 71. A first mounting portion 73 is integrally provided on a portion of the peripheral portion 71a of the first plate portion 71 located on the upper end side (a portion corresponding to the upper long side of the long sides of the rectangle corresponding to the first plate portion 71). Second mounting portions 74, 74 are integrally provided on a portion of the peripheral portion 71a of the first plate portion 71 located on the lower end side (a portion corresponding to the lower long side of the long sides of the rectangle corresponding to the first plate portion 71).

[0094] The first mounting portion 73 is formed in a plate shape extending from an upper end of the first plate portion 71 toward the inside in the vehicle width direction. The first mounting portion 73 is disposed at a middle position in the vehicle front-rear direction of the first plate portion 71. As shown in FIG. 12, the first mounting portion 73 is fastened to the upper tunnel rain 12 with a bolt 106. This fastening connects the second left inner bracket 70L to the tunnel panel 11 via the upper tunnel rain 12. Also, as shown in FIG. 7 etc., the dimension of the first mounting portion 73 in the vehicle front-rear direction is shorter than the dimension of the first plate portion 71 in the vehicle front-rear direction.

[0095] The second mounting portions 74, 74 are formed in a plate shape extending from the lower end of the first plate portion 71 toward the inside in the vehicle width direction. The second mounting portions 74, 74 are disposed at a front position in the vehicle front-rear direction of the first plate portion 71 and a rear position in the vehicle front-rear direction of the first plate portion 71. As shown in FIG. 13, the second mounting portion 74 is fastened to the lower flange 42aL of the second left case 42L by a bolt 107. By this fastening, the second left inner bracket 70L is attached to the left battery unit 40L via the flange 42aL. Also, as shown in FIG. 14 etc., the dimension of each of the second mounting portions 74, 74 in the vehicle front-rear direction is shorter than the dimension of the first plate portion 71 in the vehicle front-rear direction.

[0096] 12 and 13, the first mounting portion 73 is connected to the tunnel panel 11 and the second mounting portions 74, 74 are connected to the left battery unit 40L, so that the left battery unit 40L is supported on the vehicle body via the second left inner bracket 70L. The second right inner bracket 70R functions both as a protector and as a second mounting bracket.

[0097] Also, as shown in Figures 12 and 13, when the first mounting portion 73 is connected to the tunnel panel 11 and the second mounting portion 74, 74 is connected to the left battery unit 40L, the second left inner bracket 70L extends upward from the upper surface of the lower flange 42aL (the portion where the second mounting portion 74, 74 is connected) to the lower surface of the upper tunnel rain 12 (the portion where the first mounting portion 73 is connected).

[0098] In this state, the upper end of the first plate portion 71 protrudes upward above the upper end (left side upper surface portion 46L) of the left side battery unit 40L (see Figure 6), and covers from the inside the side portion of the left side inner side portion 45L that is defined by the upper first left case 41L (in particular, the side portion toward the rear of the vehicle relative to the universal joint 9a).

[0099] 12 and 13, the second shaft portion 9c of the rear propeller shaft 9, which is located on the vehicle rear side of the universal joint 9a, is disposed above the left battery unit 40L in the vehicle height direction when viewed in a cross section passing through at least the first plate portion 71. The height positions of the upper end portion of the first plate portion 71 and the first mounting portion 73 are set to positions higher than the lower end portion of the second shaft portion 9c and lower than the upper end portion of the second shaft portion 9c in the vehicle height direction.

[0100] In this embodiment, a connection position P2 between the second left inner bracket 70L as the second mounting bracket and the tunnel panel 11 (specifically, a connection position between the first mounting portion 73 and the upper tunnel rain 12, where the bolt 106 is fastened) is lower in the vehicle height direction than a connection position P1 between the first left inner bracket 70L and the tunnel panel 11. In other words, the connection position P1 between the first left inner bracket 70L and the tunnel panel 11 is set to be higher in the vehicle height direction than a connection position P2 between the second left inner bracket 70L as the second mounting bracket and the tunnel panel 11.

[0101] In detail, the connection position P2 between the second left inner bracket 70L and the tunnel panel 11 is positioned closer to the floor panel 30 in the vehicle height direction than the upper end of the tunnel panel 11 when viewed in a cross section perpendicular to the vehicle fore-and-aft direction.

[0102] Also, as shown in FIG. 8, the left lateral rib 65L as a reinforcing rib is positioned closer to the height position of the floor panel 30 in the vehicle height direction than the connection position P1 between the first left inner bracket 60L and the tunnel panel.

[0103] Also, as shown in FIG. 8, the left side lateral rib 65L as a reinforcing rib is positioned in the vehicle height direction so as to be closer to the height position of the left side upper surface portion 46L as the upper surface portion of the left side battery unit 40L than the connection position P1 between the first left side inner bracket 60L and the tunnel panel.

[0104] Also, as shown in FIG. 8, the first left inner bracket 60L is positioned so that the portion located below the left lateral rib 65L covers the left inner side surface portion 45L from the inside in the vehicle width direction, while the portion located above the left lateral rib 65L covers the inner side surface portion 11a of the tunnel panel 11 from the inside in the vehicle width direction.

[0105] (Configuration Related to Right Battery Unit 40R) Next, the peripheral configuration of the right battery unit 40R will be described. Although the peripheral configuration of the right battery unit 40R differs from that of the left battery unit 40L in detailed shape, the basic configuration is configured to be symmetrical to the left and right battery unit 40L. Therefore, only the parts of the peripheral configuration of the right battery unit 40R that differ from the peripheral configuration of the left battery unit 40L will be described in detail, and the parts that are common to the peripheral configuration of the left battery unit 40L will be omitted from detailed description as appropriate.

[0106] 4 and 6, the right battery unit 40R is box-shaped and has a substantially rectangular shape in bottom view. In detail, the right battery unit 40R has a right front portion 43R, a right outer side portion 44R extending in the front-rear direction from an outer end of the right front portion 43R in the vehicle width direction, a right inner side portion 45R extending in the front-rear direction from an inner end of the right front portion 43R in the vehicle width direction, a right upper surface portion 46R extending horizontally from an upper end of the right front portion 43R toward the rear of the vehicle, a right lower surface portion 47R extending from a lower end of the right front portion 43R facing the right upper surface portion 46R in the up-down direction, and a right rear surface portion 48R facing the right front portion 43R in the front-rear direction.

[0107] The edges of the respective surface portions 43R to 48R of the right battery unit 40R are integral with each other. The right front surface portion 43R has an inner portion in the vehicle width direction located rearward of an outer portion in the vehicle width direction.

[0108] The right-side battery unit 40R according to this embodiment is formed by fastening a pair of upper and lower case members. In detail, as shown in Figs. 7 and 8, the right-side battery unit 40R has a first right-side case 41R and a second right-side case 42R that are divided in the vertical direction. The first right-side case 41R is a case member that includes a right-side upper surface portion 46R and is located relatively on the upper side. The second right-side case 42R is a case member that includes a right-side lower surface portion 47R and is located relatively on the lower side.

[0109] Further, the right outer side surface portion 44R of the right battery unit 40R extends along the inner side surface portion 11a that faces the inside in the vehicle width direction of the inner wall portion of the tunnel panel 11. In other words, in the vehicle width direction, the right outer side surface portion 44R is disposed at approximately the same position as the inner side surface portion 11a of the tunnel panel 11 (see FIG. 8).

[0110] The first right case 41R and the second right case 42R are each formed in a box shape that opens toward the upper or lower side of the vehicle, and have flanges 41aR, 42aR provided along the periphery of the opening. In detail, the first right case 41R has a flange 41aR at its lower end that extends along the edge, and the second right case 42R has a flange 42aR at its upper end that extends along the edge.

[0111] The first right case 41R and the second right case 42R as case members can be fastened to each other by inserting bolts (fasteners) into the flanges 41aR and 42aR. In more detail, the first right case 41R and the second right case 42R are connected by bolts with the flanges 41aR and 42aR butted against each other in the up-down direction.

[0112] The right battery unit 40R is connected to vehicle body structural components via multiple mounting brackets 51R, 52R. The mounting brackets 51R, 52R according to this embodiment are attached to a right outer side surface portion 44R of the right battery unit 40R that faces the outside (right side) in the vehicle width direction, and a right inner side surface portion 45R of the right battery unit 40R that faces the inside (left side) in the vehicle width direction, respectively.

[0113] Specifically, a right outer bracket 52R serving as a mounting bracket is attached to a right outer side surface portion 44R of the right battery unit 40R (see FIGS. 1 and 2B). This right outer bracket 52R connects the right battery unit 40R to the floor panel 30. Similarly, a right inner bracket 51R serving as a mounting bracket is attached to a right inner side surface portion 45R of the right battery unit 40R (see FIGS. 1 and 2B). This right inner bracket 51R connects the right battery unit 40R to the tunnel panel 11.

[0114] The right outer bracket 52R is disposed at multiple locations spaced apart in the vehicle front-rear direction. Here, the right outer bracket 52R according to this embodiment includes at least a first right outer bracket 80R extending along the vehicle front-rear direction.

[0115] Specifically, the right side outer bracket 52R in this embodiment has the first right side outer bracket 80R described above, and a second right side outer bracket 90R that is positioned rearward of the first right side outer bracket 80R in the vehicle fore-and-aft direction.

[0116] Of these, the first right outer bracket 80R extends along the vehicle front-rear direction so as to pass through the center of gravity G2 of the right battery unit 40R in the vehicle front-rear direction. In other words, as shown in Fig. 1, the front end of the first right outer bracket 80R is disposed on the vehicle front side of the center of gravity G2 of the right battery unit 40R, and the rear end of the first right outer bracket 80R is disposed on the vehicle rear side of the center of gravity G2 of the right battery unit 40R.

[0117] Although not shown in the drawings, an energy absorbing member is provided integrally with the first right outer bracket 80R. This energy absorbing member is provided integrally with the first right outer bracket 80R from the front end to the rear end.

[0118] On the other hand, the second right outer bracket 90R is attached to the rear end position of the right outer side surface portion 44R. Although not shown, the lower part of the second right outer bracket 90R is attached to the second right case 42R with a bolt. The upper end part of the second right outer bracket 90R is fixed to the lower surface of the right floor frame 21 with a bolt.

[0119] The right inner bracket 51R is arranged in a plurality of positions spaced apart in the vehicle front-rear direction. Here, the right inner bracket 51R according to this embodiment includes a first right inner bracket 60R and a second right inner bracket 70R arranged alongside the first right inner bracket 60R in the vehicle front-rear direction and positioned rearward of the first right inner bracket 60R.

[0120] Of these, the first right inner bracket 60R is disposed closer to the vehicle front than the universal joint 9a, and closer to the transmission 4 than the second right inner bracket 70R. As shown in Fig. 1, the first right inner bracket 60R is disposed closer to the first right outer bracket 80R than the second right outer bracket 90R in the vehicle front-rear direction. The first right inner bracket 60R as a mounting bracket is disposed closer to the energy absorbing member 85 in the vehicle front-rear direction than the second right inner bracket 70R as a second mounting bracket.

[0121] The first right inner bracket 60R functions as a mounting bracket for connecting the right battery unit 40R to vehicle body components, and also functions as a protector that covers the right inner side surface portion 45R from the inside in the vehicle width direction. The first right inner bracket 60R is a member that prevents the transfer 4a from contacting the right inner side surface portion 45R of the right battery unit 40R when the transmission 4 together with the transfer 4a enters the floor tunnel 10 during a frontal collision. The right inner protector 70R is made of, for example, cast iron.

[0122] 11, the first right inner bracket 60R has a right plate portion 61R that actually covers the right inner side surface portion 45R, and a right vehicle body connecting portion 72R that is connected to a vehicle body constituent member. The right vehicle body connecting portion 62R is provided on the upper end portion of the right plate portion 61R.

[0123] The right plate portion 61R covers the portion of the right inner side surface portion 45R that corresponds to the first right case 41R. As shown in Fig. 11, the right plate portion 61R has a symmetrical shape in the front-rear direction, extends straight from the lower side to the upper side, and then its width in the front-rear direction gradually narrows toward the right vehicle body connecting portion 62R. The right vehicle body connecting portion 62R has a smaller width in the front-rear direction of the vehicle than the right plate portion 71R.

[0124] As shown in Figs. 7 and 8, the inner surface (ie, the left surface) of the right plate portion 61R in the vehicle width direction is located at approximately the same position as the inner ends of the upper and lower flanges 41aR, 42aR in the vehicle width direction.

[0125] As shown in Figs. 7 to 8 and 11, two right attachment parts 63R for attaching the first right inner bracket 60R to the right battery unit 40R are provided on the outer surface (i.e., the right surface) of the right plate part 61R in the vehicle width direction. The right attachment parts 63R are provided on the front and lower end and the rear and lower end of the right plate part 61R, respectively. A bolt 102 (shaft-shaped fastening member) is inserted into each right attachment part 63R so as to extend in the vertical direction. As shown in Fig. 7, the bolt 102 is fastened to the upper and lower flanges 41aR, 42aR while remaining in a position extending in the vertical direction (only the rear right attachment part 63R is shown in Fig. 7). As a result, the first right inner bracket 60R is fixed to the upper and lower flanges 41aR, 42aR of the right battery unit 40R. With this fixation, the first right inner bracket 60R is attached to the right battery unit 40R via the flange 42aR.

[0126] As shown in Fig. 11, a plurality of reinforcing ribs are provided on the surface of the right plate portion 61R on the outer side in the vehicle width direction (i.e., the outer surface facing the right side). The reinforcing ribs include a plurality (five in this example) of right vertical ribs 64R extending in the vehicle height direction and one right horizontal rib 65R extending in the vehicle front-rear direction. Each right vertical rib 64R becomes wider as it approaches the right horizontal rib 65R. The right vertical rib 64R located at the most front side among the plurality of right vertical ribs 64R is integrated with the front right mounting portion 63R. The right vertical rib 64R located at the most rear side among the plurality of right vertical ribs 64R is integrated with the rear right mounting portion 63R.

[0127] The right lateral rib 65R extends straight forward from the upper end of the right vertical rib 64R located at the rearmost side, passes through the vertical middle part of the right vertical rib 64R, and is then integrated with the upper end of the right vertical rib 64R located at the frontmost side. The right lateral rib 65R is integrated with each right vertical rib 64R. As shown in FIG. 10, the right lateral rib 65R is located at approximately the same height as the floor panel 30. The right lateral rib 65R protrudes outward in the vehicle width direction more than the right vertical rib 64R, and its tip is located near the tunnel panel 11.

[0128] As shown in Fig. 11, the right side vehicle body connection portion 62R extends upward from the upper end portion of the right side plate portion 61R, and then curves at a substantially right angle and extends toward the inside in the vehicle width direction. The right side vehicle body connection portion 62R is fixed to the upper tunnel rain 12 with a bolt 105. As shown in Fig. 11, the bolt 103 is fastened to a weld nut provided on the upper tunnel rain 12 in a position extending in the vertical direction. With this fastening, the first right inner bracket 60R is connected to the tunnel panel 11 via the upper tunnel rain 12.

[0129] Each right mounting portion 63R is attached to the right battery unit 40R, and the right vehicle body connection portion 62R is connected to the tunnel panel 11, so that the right battery unit 40R is supported on the vehicle body via the first right inner bracket 60R. In other words, the first right inner bracket 70R functions both as a protector and as a mounting bracket.

[0130] Also, as shown in Figures 7 and 8, when each right side mounting portion 63R is attached to the right side battery unit 40R and the right side vehicle body connection portion 62R is connected to the tunnel panel 11, the first right side inner bracket 60R extends upward from the upper surface of the lower flange 42aR (the portion to which each right side mounting portion 63R is connected) to the lower surface of the upper tunnel rain 12 (the portion to which the right side vehicle body connection portion 62R is connected).

[0131] In this embodiment, the connection position between the first right inner bracket 60R as a mounting bracket and the tunnel panel 11 (specifically, the connection position between the right vehicle body connection portion 62R and the upper tunnel rain 12, where the bolt 103 is fastened) is higher in the vehicle height direction than the height position of the floor panel 30, similar to the first left inner bracket 60L. More specifically, the connection position between the first right inner bracket 60R and the tunnel panel 11 is disposed closer to the upper end of the tunnel panel 11 than the floor panel 30 in the vehicle height direction when viewed in a cross section perpendicular to the vehicle front-rear direction.

[0132] 7 and 8, the first shaft portion 9b of the rear propeller shaft 9, which is located further forward of the vehicle than the universal joint 9a, is disposed above the right battery unit 40R in the vehicle height direction when viewed at least in a cross section passing through the right plate portion 61R. The connection position between the first right inner bracket 60R as a mounting bracket and the tunnel panel 11 is higher in the vehicle height direction than the height position of the rear propeller shaft 9, more specifically, the height position of the first shaft portion 9b.

[0133] Also, as shown in FIG. 8, the right lateral rib 65R serving as a reinforcing rib is positioned closer to the height position of the floor panel 30 in the vehicle height direction than the connection position between the first right inner bracket 60R and the tunnel panel.

[0134] Also, as shown in FIG. 8, the right side lateral rib 65R as a reinforcing rib is positioned in the vehicle height direction at the connection position between the first right side inner bracket 60R and the tunnel panel, close to the height position of the right side upper surface portion 46R as the upper surface portion of the right side battery unit 40R.

[0135] Also, as shown in Figure 8, the first right inner bracket 60R is positioned so that the portion located below the right lateral rib 65R covers the right inner side surface portion 45R from the inside in the vehicle width direction, while the portion located above the right lateral rib 65R covers the inner side surface portion 11a of the tunnel panel 11 from the inside in the vehicle width direction.

[0136] The second right inner bracket 70R is arranged alongside the first right inner bracket 60R along the vehicle front-rear direction, and is arranged farther away from the center of gravity G2 of the right battery unit 40R in the vehicle front-rear direction than the first right inner bracket 60R. Specifically, the second right inner bracket 70R according to this embodiment is arranged on the vehicle rear side than the universal joint 9a. Also, as shown in FIG. 3, the second right inner bracket 70R is closer to the universal joint 9a than the first right inner bracket 60R in the vehicle front-rear direction. As shown in FIG. 4 and other figures, the first right inner bracket 60R is arranged at an intermediate position between the first right outer bracket 80R and the second right outer bracket 90R in the vehicle front-rear direction.

[0137] The second right inner bracket 70R is configured as a plate-shaped protector that covers a portion of the right inner side surface portion 45R that is located rearward of the vehicle relative to the universal joint 9a. The second right inner bracket 70R functions when the transmission 4 together with the transfer 4a enters the floor tunnel 10 during a frontal collision and is bent to the right or left starting from the universal joint 9a. In this case, the second right inner bracket 70R exerts its function as a member for suppressing contact between the universal joint 9a and the right inner side surface portion 45R of the right battery unit 40R. The right inner protector 70R is configured, for example, of a high-tensile steel plate part.

[0138] As shown in Fig. 4, the dimension of the second right inner bracket 70R in the vehicle front-rear direction is longer than the dimension of the universal joint 9a in the vehicle front-rear direction. Also, as shown in Fig. 12 and Fig. 13, the dimension of the second right inner bracket 70R in the vehicle height direction is longer than the length of the side surface portion of the right inner side surface portion 45R defined by the upper first right case 41R.

[0139] Specifically, the second right inner bracket 70R as a protector, as illustrated in Figures 12 to 15, has plate portions 71, 72 extending along the vehicle fore-and-aft direction and vehicle height direction, a first mounting portion 73 provided on the peripheral portion 71a of the plate portion 71 and connected to a body component of the vehicle 1 (more specifically, the tunnel panel 11), and two second mounting portions 74, 74 provided on the peripheral portion 71a of the plate portion 71 and connected to the right side battery unit 40R.

[0140] The plate portions 71, 72 are made of two plate-like bodies stacked in the vehicle width direction. Of the two plate-like bodies, the first plate portion 71 located on the inner side in the vehicle width direction is formed in a rectangular shape whose dimension in the vehicle front-rear direction is longer than that in the vehicle height direction. Of the two plate-like bodies, the second plate portion 72 located on the outer side in the vehicle width direction is formed in a rectangular shape having approximately the same dimensions as the first plate portion 71. The first plate portion 71 and the second plate portion 72 are joined together by, for example, welding.

[0141] Each of the two plate-like bodies constituting the plate portions 71 and 72 is provided with a bead portion extending along the vehicle longitudinal direction. Specifically, of the two plate-like bodies, the bead portion provided on the first plate portion 71 located on the inner side in the vehicle width direction constitutes a first bead portion 71b protruding toward the inside in the vehicle width direction. This first bead portion 71b is composed of a plurality of bead shapes arranged along the vertical direction. As shown in Figs. 12 to 14, each of the first bead portions 71b has a shape that extends along the vehicle longitudinal direction and protrudes toward the inside in the vehicle width direction. In other words, each of the first bead portions 71b has a concave cross-sectional shape that is recessed toward the inside in the vehicle width direction when viewed in a cross section perpendicular to the vehicle longitudinal direction.

[0142] On the other hand, of the two plate-like bodies, the bead portion provided on the second plate portion 72 located on the outer side in the vehicle width direction constitutes a second bead portion 72b protruding outward in the vehicle width direction. This second bead portion 72b is composed of a plurality of bead shapes arranged along the up-down direction. As shown in Figs. 12 to 13 and 15, each second bead portion 72b has a shape that extends along the vehicle front-rear direction and protrudes outward in the vehicle width direction. In other words, each second bead portion 72b has a concave cross-sectional shape that is recessed outward in the vehicle width direction when viewed in a cross section perpendicular to the vehicle front-rear direction.

[0143] 12 and 13, the first bead portion 71b and the second bead portion 72b are disposed to face each other. Therefore, when viewed in a cross section perpendicular to the vehicle front-rear direction, the first bead portion 71b and the second bead portion 72b define a closed cross section extending along the vehicle front-rear direction.

[0144] Additionally, a peripheral portion 71a of the first plate portion 71 is bent toward the inside in the vehicle width direction along the contour of the first plate portion 71. A first mounting portion 73 is integrally provided on a portion of the peripheral portion 71a of the first plate portion 71 located on the upper end side (a portion corresponding to the upper long side of the long sides of the rectangle corresponding to the first plate portion 71). Second mounting portions 74, 74 are integrally provided on a portion of the peripheral portion 71a of the first plate portion 71 located on the lower end side (a portion corresponding to the lower long side of the long sides of the rectangle corresponding to the first plate portion 71).

[0145] The first mounting portion 73 is formed in a plate shape extending from an upper end of the first plate portion 71 toward the inside in the vehicle width direction. The first mounting portion 73 is disposed at a middle position in the vehicle front-rear direction of the first plate portion 71. As shown in FIG. 12, the first mounting portion 73 is fastened to the upper tunnel rain 12 with a bolt 106. This fastening connects the second right inner bracket 70R to the tunnel panel 11 via the upper tunnel rain 12. Also, as shown in FIG. 7 etc., the dimension of the first mounting portion 73 in the vehicle front-rear direction is shorter than the dimension of the first plate portion 71 in the vehicle front-rear direction.

[0146] The second mounting portions 74, 74 are formed in a plate shape extending from the lower end of the first plate portion 71 toward the inside in the vehicle width direction. The second mounting portions 74, 74 are disposed at a front position in the vehicle front-rear direction of the first plate portion 71 and a rear position in the vehicle front-rear direction of the first plate portion 71. As shown in FIG. 13, the second mounting portion 74 is fastened to the lower flange 42aR of the second right case 42R by a bolt 107. By this fastening, the second right inner bracket 70R is attached to the right battery unit 40R via the flange 42aR. Also, as shown in FIG. 14 etc., the dimension of each of the second mounting portions 74, 74 in the vehicle front-rear direction is shorter than the dimension of the first plate portion 71 in the vehicle front-rear direction.

[0147] 12 and 13, the first mounting portion 73 is connected to the tunnel panel 11 and the second mounting portions 74, 74 are connected to the right battery unit 40R, so that the right battery unit 40R is supported on the vehicle body via the second right inner bracket 70R. The second left inner bracket 70L has both a function as a protector and a function as a second mounting bracket.

[0148] Also, as shown in Figures 12 and 13, when the first mounting portion 73 is connected to the tunnel panel 11 and the second mounting portions 74, 74 are connected to the right battery unit 40R, the second right inner bracket 70R extends upward from the upper surface of the lower flange 42aR (the portion where the second mounting portions 74, 74 are connected) to the lower surface of the upper tunnel rain 12 (the portion where the first mounting portion 73 is connected).

[0149] In this state, the upper end of the first plate portion 71 protrudes upward above the upper end (right upper surface portion 46R) of the right-side battery unit 40R (see Figure 6), and covers from the inside the side portion of the right-side inner side portion 45R that is defined by the upper first right case 41R (in particular, the side portion toward the rear of the vehicle relative to the universal joint 9a).

[0150] 12 and 13, the second shaft portion 9c of the rear propeller shaft 9, which is located on the vehicle rear side of the universal joint 9a, is disposed above the right battery unit 40R in the vehicle height direction when viewed in a cross section passing through at least the first plate portion 71. The height positions of the upper end portion of the first plate portion 71 and the first mounting portion 73 are set to be higher than the lower end portion of the second shaft portion 9c and lower than the upper end portion of the second shaft portion 9c in the vehicle height direction.

[0151] In this embodiment, the connection position between the second right inner bracket 70R as the second mounting bracket and the tunnel panel 11 (specifically, the connection position between the first mounting portion 73 and the upper tunnel rain 12, where the bolt 106 is fastened) is lower in the vehicle height direction than the connection position P1 between the first right inner bracket 70R and the tunnel panel 11, as shown in Fig. 6. In other words, the connection position between the first right inner bracket 70R and the tunnel panel 11 is set to be higher in the vehicle height direction than the connection position between the second right inner bracket 70R as the second mounting bracket and the tunnel panel 11.

[0152] In detail, the connection position P2 between the second right inner bracket 70R and the tunnel panel 11 is positioned closer to the floor panel 30 in the vehicle height direction than the upper end of the tunnel panel 11 when viewed in a cross section perpendicular to the fore-and-aft direction of the vehicle.

[0153] Also, as shown in FIG. 8, the right lateral rib 65R serving as a reinforcing rib is positioned so as to be closer in the vehicle height direction to the height position of the floor panel 30 than the connection position P1 between the first right inner bracket 60R and the tunnel panel.

[0154] Also, as shown in FIG. 8, the right side lateral rib 65R as a reinforcing rib is positioned in the vehicle height direction so as to be closer to the height position of the right side upper surface portion 46R as the upper surface portion of the right side battery unit 40R than the connection position P1 between the first right side inner bracket 60R and the tunnel panel.

[0155] Also, as shown in Figure 8, the first right inner bracket 60R is positioned so that the portion located below the right lateral rib 65R covers the right inner side surface portion 45R from the inside in the vehicle width direction, while the portion located above the right lateral rib 65R covers the tunnel panel 11 from the inside in the vehicle width direction.

[0156] (Protection of the battery unit during a side impact) Here, a side collision from the left side of the vehicle will be described, but the following description is also applicable to a side collision from the right side of the vehicle.

[0157] According to this embodiment, the load F input to the vehicle during a vehicle side collision is transmitted in a divided state, that is, a load f1 propagating toward the inside in the vehicle width direction along the floor panel 30, and a load f2 propagating toward the inside in the vehicle width direction along the left battery unit 40L, more specifically, the left upper surface portion 46L. In this case, if the connection position P1 between the first left inner bracket 60L as the mounting bracket and the tunnel panel 11 is located at the same height as the propagation paths of the two loads, an excessive load will act on this connection position P1, and there is a concern that the bolt 103L may be sheared. Shearing of the bolt 103L is inconvenient because it may cause the mounting bracket to fall off.

[0158] In contrast, according to this embodiment, the connection position P1 between the first left inner bracket 60L and the tunnel panel 11 is set higher in the vehicle height direction than the height position of the floor panel 30, as shown in Fig. 8. By setting it in this manner, it is possible to distribute the transmitted load as described above, and in turn to alleviate the load acting on the connection position P1. This makes it possible to connect the left battery unit 40L and a vehicle body structural component such as the floor panel 30 by the first left inner bracket 60L, while preventing the first left inner bracket 60L from falling off during a vehicle side collision.

[0159] 8, by setting the connection position P1 between the first left inner bracket 60L and the tunnel panel 11 higher than the height position of the rear propeller shaft 9, it is possible to suppress interference between the rear propeller shaft 9 and the first left inner bracket 60L in the event of a vehicle side collision. This is advantageous in suppressing the first left inner bracket 60L from falling off in the event of a vehicle side collision.

[0160] Also, as shown in FIG. 4, the first left inner bracket 60L as the mounting bracket is closer to the center of gravity G2 of the left battery unit 40L than the second left inner bracket 70L as the second mounting bracket. Here, when a load acts from the side near the first left inner bracket 60L, the rotation of the left battery unit 40L is not induced as much as when the load acts near the second left inner bracket 70L. In this case, more kinetic energy is allocated to the translational movement of the left battery unit 40L. Therefore, the first left inner bracket 60L is subject to stricter collision requirements than the second left inner bracket 70L.

[0161] 6, by setting the connection position P1 of the first left inner bracket 60L relatively high in the vehicle height direction, the load acting on the vehicle 1 during a side collision can be better distributed, and the collision requirements can be more reliably met. On the other hand, by setting the connection position P2 of the second left inner bracket 70L relatively low, it is possible to set the dimension in the vehicle height direction relatively short. This contributes to reducing the weight of the vehicle 1.

[0162] 4 and 8, it is possible to reduce the load acting on the first left inner bracket 60L. This is advantageous in preventing the first left inner bracket 60L from falling off in the event of a vehicle side collision.

[0163] 8, the inner side surface portion 45L of the left battery unit 40L extends along the inner side surface portion 11a of the inner wall portion of the tunnel panel 11 that faces inward in the vehicle width direction. This configuration makes it possible to ensure that the volume of the left battery unit 40L is as large as possible. By using the first left inner bracket 60L as described above in such a left battery unit 40L, it is possible to achieve both a high battery capacity and prevention of the first left inner bracket 60L from falling off.

[0164] 8, arranging the left lateral rib 65L at approximately the same height as the floor panel 30 corresponds to providing a reinforcing rib at a location where a larger load is expected to act. This configuration is advantageous in suppressing deformation of the first left inner bracket 60L and, in turn, falling off of the first left inner bracket 60L.

[0165] (Other embodiments) The technology disclosed herein is not limited to the above-described embodiment, and may be substituted without departing from the spirit and scope of the claims.

[0166] For example, in the above-described embodiment, the vehicle 1 is a four-wheel drive vehicle. However, the present invention is not limited to this, and may be, for example, a rear-engine, front-wheel drive vehicle. When the vehicle 1 is a rear-engine, the transfer 4a and the front propeller shaft 8 are omitted. The vehicle 1 may be an electric vehicle that does not include the engine 2 and has only the motor 3 as a drive source.

[0167] The above-described embodiments are merely illustrative and should not be construed as limiting the scope of the present disclosure. The scope of the present disclosure is defined by the claims, and all modifications and variations within the scope of the claims are within the scope of the present disclosure. [Explanation of symbols]

[0168] 1 vehicle 2 Engine 4 Transmission 4a Transfer (transmission) 7 Rear wheel 9 Rear propeller shaft (propeller shaft) 10 Floor Tunnel 11 Tunnel Panel 11a Inner wall of tunnel panel 30 Floor Panel 40L Left side battery unit (battery unit) 40R Right side battery unit (battery unit) 41L First left case (case material) 41R First right case (case part) 41aL flange 41aR flange 42L Second left case (case material) 42R Second right case (case material) 42aL flange 42aR flange 44L Left side outer surface 44R Right side outer surface 45L Left inner side 45R Right side inner side 51L Left side inner bracket 51R Right side inner bracket 52L Left side outer bracket 52R Right side outer bracket 60L 1st left inner bracket (mounting bracket) 60R 1st right inner bracket (mounting bracket) 61L Left side plate part (plate part) 61R Right side plate part (plate part) 65L Left side horizontal rib (reinforcement rib) 65R Right side horizontal rib (reinforcement rib) 70L Second left inner bracket (second mounting bracket) 70R Second right inner bracket (second mounting bracket) 85 Energy absorbing members 107 Fasteners P1 Connection position (Connection position between mounting bracket and tunnel panel) P2 Connection position (connection position between second mounting bracket and tunnel panel) G2 Center of gravity of the battery unit in the longitudinal direction of the vehicle

Claims

1. A vehicle underbody structure having rear drive wheels, a transmission disposed with at least a rear portion of the vehicle inserted into a floor tunnel; a propeller shaft extending from the transmission toward the rear of the vehicle and transmitting power to the rear wheels; left and right battery units disposed under the vehicle with respect to floor panels disposed on the left and right sides of the floor tunnel; a mounting bracket attached to an inner surface portion of the battery unit facing inward in a vehicle width direction and connected to a tunnel panel that defines the floor tunnel; A connection position between the mounting bracket and the tunnel panel is higher than a height position of the floor panel in a vehicle height direction and is closer to an upper end of the tunnel panel than the floor panel in the vehicle height direction.

1. A vehicle undercarriage comprising:

2. A lower structure of a vehicle with rear drive wheels, a transmission disposed with at least a rear portion of the vehicle inserted into a floor tunnel; a propeller shaft extending from the transmission toward the rear of the vehicle and transmitting power to the rear wheels; left and right battery units disposed under the vehicle with respect to floor panels disposed on the left and right sides of the floor tunnel; a mounting bracket attached to an inner surface portion of the battery unit facing inward in a vehicle width direction and connected to a tunnel panel that defines the floor tunnel; a second mounting bracket arranged alongside the mounting bracket along the vehicle front-rear direction and spaced apart from a center of gravity of the battery unit in the vehicle front-rear direction compared to the mounting bracket, a connection position between the mounting bracket and the tunnel panel is higher than a height position of the floor panel in a vehicle height direction; A connection position between the mounting bracket and the tunnel panel is higher in a vehicle height direction than a connection position between the second mounting bracket and the tunnel panel.

1. A vehicle undercarriage comprising:

3. A lower structure of a vehicle having rear drive wheels, a transmission disposed with at least a rear portion of the vehicle inserted into a floor tunnel; a propeller shaft extending from the transmission toward the rear of the vehicle and transmitting power to the rear wheels; left and right battery units disposed under the vehicle with respect to floor panels disposed on the left and right sides of the floor tunnel; a mounting bracket attached to an inner surface portion of the battery unit facing inward in a vehicle width direction and connected to a tunnel panel that defines the floor tunnel; a connection position between the mounting bracket and the tunnel panel is higher than a height position of the floor panel in a vehicle height direction; The mounting bracket has a plate portion extending along a vehicle height direction, A reinforcing rib extending along the vehicle front-rear direction is provided on an outer surface of the plate portion, The reinforcing rib is disposed so as to be closer to a height position of the floor panel than a connection position between the mounting bracket and the tunnel panel in a vehicle height direction.

1. A vehicle undercarriage comprising:

4. The vehicle underbody structure according to any one of claims 1 to 3, A connection position between the mounting bracket and the tunnel panel is higher than a height position of the propeller shaft in a vehicle height direction.

1. A vehicle undercarriage comprising:

5. The vehicle underbody structure according to claim 2, an energy absorbing member attached to an outer surface portion of the battery unit facing outward in a vehicle width direction; The mounting bracket is disposed closer to the energy absorbing member than the second mounting bracket in the vehicle front-rear direction.

1. A vehicle undercarriage comprising:

6. The vehicle underbody structure according to any one of claims 1 to 5, The inner side surface portion of the battery unit extends along an inner side surface portion of the inner wall portion of the tunnel panel that faces inward in the vehicle width direction.

1. A vehicle undercarriage comprising:

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