Vehicle lower structure

Abstract

To provide a vehicle lower part structure capable of reducing air resistance in a vehicle with a battery mounted on a bottom part.SOLUTION: The underbody structure includes the battery protection member 5 that protects the battery 4 mounted on the bottom 2A of the automobile 2, and the flow regulating member 10 that protrudes downward from the battery protection member 5 and is linearly provided between the front wheel and the rear wheel RW along the front-rear direction of the automobile 2, and the flow regulating member 10 is an extrusion molded product that is integrally formed with the battery protection member 5 by extrusion molding.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Conventionally, extending the cruising range of a vehicle has been considered. One method for extending such cruising range is to reduce the air resistance that the vehicle experiences while traveling. For example, a technology related to reducing such air resistance is described in Patent Document 1, the source of which is shown below.

[0003] Patent Document 1 describes a protection plate for preventing wind from being drawn into the underside of a vehicle. This protection plate is provided on the left and right sides of the bottom of the vehicle between the front and rear tires to prevent wind from being drawn in while the vehicle is running. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-120364 Summary of the Invention [Problem to be solved by the invention]

[0005] The protection plate described in Patent Document 1 is attached to a side step or underfloor panel of a vehicle. However, in recent years, automobiles equipped with a motor as a driving source (such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), battery electric vehicles (BEVs), and fuel cell electric vehicles (FCEVs)) have become widespread, and batteries are installed on the underside of these automobiles. When such a battery is installed, the wind generated by the vehicle's movement is disturbed on the underside of the automobile, causing air resistance, but the protection plate described in Patent Document 1 does not take into account automobiles equipped with batteries. For this reason, the protection plate described in Patent Document 1 leaves room for improvement in terms of reducing the air resistance of vehicles equipped with batteries.

[0006] Therefore, there is a need for a vehicle underbody structure that can reduce the air resistance of a vehicle that has a battery mounted on the bottom. [Means for solving the problem]

[0007] The characteristic configuration of the vehicle undercarriage structure of the present invention is that it comprises a battery protection member that protects a battery mounted on the bottom of the vehicle, and a straightening member that protrudes downward from the battery protection member and is arranged in a straight line between the front wheels and rear wheels along the fore-and-aft direction of the vehicle, and the straightening member is an extrusion molded product that is made integrally with the battery protection member by extrusion molding.

[0008] With this characteristic configuration, when the battery protection member is made by extrusion molding, the airflow rectifying member can be molded integrally by simply changing a portion of the cross-sectional shape of the extrusion mold. Furthermore, because the airflow rectifying member is provided between the front and rear wheels and protrudes downward, it allows air that has flowed between the bottom of the vehicle and the road surface to circulate toward the rear of the vehicle. This reduces the air resistance of a vehicle with a battery mounted on its bottom. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 10 is a diagram showing the position of a rectifying member. [Figure 4] FIG. 2 is a diagram showing airflow under a vehicle. [Figure 5] FIG. [Figure 6] 10A and 10B are diagrams illustrating positions of rectifying members according to other embodiments. [Figure 7] 10A and 10B are diagrams illustrating positions of rectifying members according to other embodiments. [Figure 8] 10A and 10B are diagrams illustrating positions of rectifying members according to other embodiments. [Figure 9] This is an example in which a flow straightening member is provided on the lower surface protection member. DETAILED DESCRIPTION OF THE INVENTION

[0010] The vehicle underbody structure according to the present invention is a structure on the underside of a vehicle, and reduces air resistance acting on the underside of the vehicle. The underside of the vehicle is the surface of the vehicle that faces the road surface. The vehicle underbody structure according to this embodiment will be described below. However, the vehicle underbody structure is not limited to the following embodiment, and various modifications are possible within the scope of the gist thereof.

[0011] FIG. 1 is a side view of a vehicle 2 to which the vehicle undercarriage structure of this embodiment is applied. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. The vehicle undercarriage structure of this embodiment is configured to include a battery protection member 5 and a straightening member 10. In this embodiment, the front side of the vehicle 2 in the traveling direction is indicated by "F", and the rear side of the vehicle 2 in the traveling direction is indicated by "B". Furthermore, when looking at the front side F of the vehicle 2 in the traveling direction, the left side of the vehicle 2 in the vehicle width direction is indicated by "L", and the right side of the vehicle 2 in the vehicle width direction is indicated by "R". Furthermore, the vertical upper side of the vehicle 2 is indicated by "U", and the vertical lower side of the vehicle 2 is indicated by "D".

[0012] As shown in FIG. 1 , a battery 4 that stores power used for propelling the vehicle 2 is mounted on the bottom 2A of the vehicle 2. The vehicle 2 is equipped with a vehicle drive device 20. The vehicle drive device 20 is housed in a motor room 32 on the front side F in the direction of travel, which is separated from the passenger compartment 30 by a partition wall 31A of a dashboard 31. The vehicle drive device 20 has a traveling drive unit 21 and a power supply module 22. The traveling drive unit 21 is provided in the lower part of the vehicle drive device 20, and the power supply module 22 is provided in the upper part of the vehicle drive device 20.

[0013] The traveling drive unit 21 has a motor 21A and a gear mechanism 21B that output power that enables the vehicle 2 to travel. The motor 21A and the gear mechanism 21B are arranged side by side along the vehicle width direction. The motor 21A is driven by a power supply module 22. The motor 21A and the gear mechanism 21B are connected via a motor shaft, and the rotation of the motor 21A is input to the gear mechanism 21B via the motor shaft. The gear mechanism 21B reduces the rotation of the motor 21A and outputs it from the gear shaft. The vehicle 2 travels using the output of the motor 21A via the gear mechanism 21B.

[0014] The power supply module 22 includes an OBC (On Board Charger) board 22A, a motor drive board 22B, and a control board 22C that controls the OBC board 22A and the motor drive board 22B. An inverter and a converter are mounted on the OBC board 22A. The inverter receives AC power consisting of AC voltage from a commercial power source and converts the AC power into DC power including DC voltage. The converter receives DC power generated by the inverter and boosts the DC voltage that constitutes the DC power supplied from the inverter to a DC voltage with a voltage value required to charge the battery 4. Therefore, the power supply module 22 can supply power to the battery 4 of the vehicle 2.

[0015] A drive inverter that controls the drive current that drives the motor 21A is mounted on the motor drive board 22B. A control unit that controls the inverter and converter is mounted on the control board 22C. Therefore, the power supply module 22 can supply power to the motor 21A. Note that this configuration of the power supply module 22 is merely an example and can be modified as appropriate.

[0016] The battery 4 is protected by a battery protection member 5. The battery protection member 5 of this embodiment is not intended to protect the battery 4 from electrical damage (for example, overvoltage protection or overcurrent protection), but rather to protect the battery 4 from physical damage due to external forces acting on the battery 4 or flying objects from the outside (outside the vehicle). Therefore, the battery protection member 5 protects the battery 4 from physical damage due to external forces acting on the battery 4 or flying objects from the outside.

[0017] 2, in this embodiment, the battery protection member 5 is configured to include an impact absorbing member 6. The impact absorbing member 6 is disposed on both outer sides of the battery 4 in the vehicle width direction of the vehicle 2. The outer sides of the battery 4 in the vehicle width direction of the vehicle 2 mean the left side L of the battery 4 in the vehicle width direction and the right side R of the battery 4 in the vehicle width direction. Therefore, the impact absorbing member 6 is disposed on the left side L of the battery 4 in the vehicle width direction and the right side R of the battery 4 in the vehicle width direction.

[0018] The battery 4 is housed in a battery case 4A and mounted on the bottom 2A. As shown in FIG. 2 , a shear panel 16 is provided on the vertical lower side D of the battery case 4A. The impact absorbing member 6 is fixed to the shear panel 16 at a portion on the center side in the vehicle width direction. Rockers 8 (side sills) that form the vertical lower side D portion of the framework around the door 17 of the vehicle 2 are provided on both outer sides in the vehicle width direction of the battery 4 of the vehicle 2. The impact absorbing member 6 has an outer portion in the vehicle width direction fixed to the rocker 8. In this embodiment, the impact absorbing member 6 is fastened to each of the shear panel 16 and the rocker 8 with bolts 9.

[0019] The impact absorbing member 6 is configured as a rectangular prism extending along the longitudinal direction of the vehicle 2. The interior of this rectangular prism is partitioned by partition walls 6A extending along the longitudinal direction of the vehicle 2 so that the interior has a rectangular or triangular shape when viewed in the longitudinal direction of the vehicle 2. Such impact absorbing member 6 is configured by extrusion molding using a metal including, for example, aluminum. The above-mentioned partition walls 6A are also formed by this extrusion molding, and are configured to have holes 6B penetrating the interior along the longitudinal direction of the vehicle 2. For example, when the vehicle 2 receives an impact from the side (outside in the vehicle width direction), the impact absorbing member 6 functions as a buffer that absorbs the impact by crushing the holes 6B, thereby absorbing the impact from the side of the vehicle 2. This prevents the impact from reaching the battery 4, making it possible to protect the battery 4.

[0020] The bottom protection member 7 is disposed over the entire surface below the battery 4 to protect the bottom surface of the battery 4. Below the battery 4 means the vertically lower side D of the battery 4. The bottom surface of the battery 4 is the surface of the battery 4 on the vertically lower side D. As described above, the shear panel 16 is provided on the vertically lower side D of the battery 4, and this shear panel 16 corresponds to the bottom protection member 7.

[0021] 2, the underside protection member 7 is provided in a state where it is positioned between the battery 4 and the road surface 200, and prevents damage to the battery 4 from pebbles and the like that may be kicked up while the vehicle 2 is traveling. The underside protection member 7 is fixed to the impact absorbing member 6 via the bolts 9, as described above.

[0022] The underside protection member 7 is configured as a plate-like body extending along the front-rear direction of the vehicle 2. Such a underside protection member 7 can be formed by press molding using a metal containing aluminum, for example.

[0023] The rectifying member 10 is provided in a state in which it protrudes downward from the battery protection member 5. In this embodiment, the rectifying member 10 is provided in a state in which it protrudes downward from the lower surface of the impact absorbing member 6 that faces the road surface 200. Protruding downward from the impact absorbing member 6 refers to a state in which it protrudes toward the road surface 200 beyond the lower surface of the impact absorbing member 6. Therefore, the rectifying member 10 is provided in a state in which it protrudes toward the road surface 200 beyond the lower surface of the impact absorbing member 6 that faces the road surface 200.

[0024] The airflow straightening member 10 is provided linearly between the front wheels FW and the rear wheels RW along the longitudinal direction of the vehicle 2. In this embodiment, the airflow straightening member 10 is provided on the right side R and the left side L in the vehicle width direction of the vehicle 2. In this embodiment, the airflow straightening member 10 on the right side R in the vehicle width direction is provided so as to extend along the longitudinal direction of the vehicle 2 between the right front wheel RFW and the right rear wheel RRW of the vehicle 2. In addition, the airflow straightening member 10 on the left side L in the vehicle width direction is provided so as to extend along the longitudinal direction of the vehicle 2 between the left front wheel LFW and the left rear wheel LRW of the vehicle 2.

[0025] In this embodiment, the airflow straightening member 10 on the right side R in the vehicle width direction is provided so as to overlap the right front wheel RFW and the right rear wheel RRW when the vehicle 2 is viewed from the front side F in the traveling direction. That is, the airflow straightening member 10 on the right side R in the vehicle width direction is provided in a state sandwiched between the right front wheel RFW and the right rear wheel RRW along the traveling direction of the vehicle 2. More specifically, as shown in Fig. 3 , the airflow straightening member 10 is provided closer to the center in the vehicle width direction of the vehicle 2 than the center portions RM in the vehicle width direction of each of the right front wheel RFW and right rear wheel RRW, and on the right side R in the vehicle width direction of the vehicle 2 than the center-side end portions RL in the vehicle width direction of each of the right front wheel RFW and right rear wheel RRW.

[0026] Furthermore, the airflow straightening member 10 on the left side L in the vehicle width direction is provided so as to overlap the left front wheel LFW and the left rear wheel LRW when the vehicle 2 is viewed from the front side F in the traveling direction. That is, the airflow straightening member 10 on the left side L in the vehicle width direction is provided in a state sandwiched between the left front wheel LFW and the left rear wheel LRW along the traveling direction of the vehicle 2. More specifically, the airflow straightening member 10 is provided closer to the center in the vehicle width direction of the vehicle 2 than the center portions LM in the vehicle width direction of the left front wheel LFW and the left rear wheel LRW, and further to the left side L in the vehicle width direction of the vehicle 2 than the center-side end portions LR in the vehicle width direction of the left front wheel LFW and the left rear wheel LRW.

[0027] The airflow straightening member 10 is configured to have a uniform length (width) along the vehicle width direction of the vehicle 2, and further configured with a uniform protruding height along the front-to-rear direction of the vehicle 2. For example, the airflow straightening member 10 can be configured to have a length (width) of about several millimeters along the vehicle width direction of the vehicle 2, and a protruding height of about several tens of millimeters. Of course, these lengths and protruding heights are merely examples, and the airflow straightening member 10 can be configured with other values.

[0028] In this embodiment, as described above, the battery protection member 5 is formed by extrusion molding. The airflow rectifying member 10 is formed integrally with the battery protection member 5 by extrusion molding. Therefore, as described above, the airflow rectifying member 10 is formed to have a uniform length along the vehicle width direction of the vehicle 2, and can be easily formed to extend along the front-rear direction of the vehicle 2. As a result, the airflow rectifying member 10 is formed as a seamless extrusion molded product along the front-rear direction of the vehicle 2. Here, in this embodiment, as described above, the airflow rectifying member 10 is provided in a state where it protrudes downward from the impact absorbing member 6. In this embodiment, the airflow rectifying member 10 is formed integrally with the impact absorbing member 6 by extrusion molding. The impact absorbing member 6 and the underside protection member 7 may be formed integrally or separately.

[0029] FIG. 4 is a diagram showing the air flow below the vehicle 2. As the vehicle 2 travels, air flows between the underside of the vehicle 2 and the road surface 200 from the front side F in the traveling direction (#1). The air that flows between the left front wheel LFW and the right front wheel RFW flows toward the rear side B in the traveling direction of the vehicle 2, and then attempts to flow outward in the vehicle width direction from between the left front wheel LFW and the left rear wheel LRW and between the right front wheel RFW and the right rear wheel RRW. However, the air flow toward the outside in the vehicle width direction of the vehicle 2 is restricted by the air straightening member 10. Therefore, the air that flows between the left front wheel LFW and the right front wheel RFW flows between the left rear wheel LRW and the right rear wheel RRW (#2), and then flows outward in the vehicle width direction to the rear side B (#3). As a result, when vehicle 2 is traveling, air resistance caused by air flowing between the left front wheel LFW and the right front wheel RFW is reduced, making it possible to increase the cruising range of vehicle 2 compared to a vehicle to which the vehicle undercarriage structure is not applied.

[0030] Furthermore, the rectifying member 10 is exposed to air as the vehicle 2 travels. Meanwhile, as described above, the rectifying member 10 and the impact absorbing member 6 are made of metal and are connected to the shear panel 16, which is also made of metal and covers the bottom surface of the battery case 4A. Therefore, heat from the battery 4 is transferred to the impact absorbing member 6 via the battery case 4A and the shear panel 16, and the impact absorbing member 6 can be cooled via the rectifying member 10.

[0031] Other Embodiments Next, other embodiments of the vehicle underbody structure will be described.

[0032] In the above embodiment, the vehicle undercarriage structure has been described as including the airflow straightening members 10 between the right front wheel RFW and the right rear wheel RRW of the vehicle 2, and between the left front wheel LFW and the left rear wheel LRW of the vehicle 2. In addition to the airflow straightening members 10, the vehicle undercarriage structure may be provided with movable spats 41 that extend and retract depending on the vehicle speed on the front side F in the traveling direction of the vehicle 2 of each of the right front wheel RFW and the left front wheel LFW of the vehicle 2. For example, when the vehicle speed is equal to or lower than a preset value, the movable spats 41 are housed so as not to protrude from the bottom part 2A toward the road surface 200 on the front side F in the traveling direction of the right front wheel RFW and the left front wheel LFW, as shown in FIG. 5(A). When the vehicle speed exceeds the preset value, the movable spats 41 are preferably in a state where they protrude from the bottom part 2A toward the road surface 200 on the front side F in the traveling direction of the right front wheel RFW and the left front wheel LFW, as shown in FIG. 5(B). This makes it possible to reduce the resistance to the right front wheel RFW and the right rear wheel RRW caused by the air that has flowed between the vehicle 2 and the road surface 200.

[0033] In the above embodiment, the straightening member 10 on the right side R in the vehicle width direction is described as being located closer to the center of the vehicle 2 in the vehicle width direction than the center portions RM of the right front wheel RFW and the right rear wheel RRW, and closer to the right side R in the vehicle width direction than the center ends RL of the right front wheel RFW and the right rear wheel RRW, and the straightening member 10 on the left side L in the vehicle width direction is described as being located closer to the center of the vehicle 2 in the vehicle width direction than the center portions LM of the left front wheel LFW and the left rear wheel LRW, and closer to the left side L in the vehicle width direction than the center ends LR of the left front wheel LFW and the left rear wheel LRW. However, as shown in Fig. 6, the airflow straightening member 10 on the right side R in the vehicle width direction may be provided in the vehicle width direction central portion RM of each of the right front wheel RFW and right rear wheel RRW, and the airflow straightening member 10 on the left side L in the vehicle width direction may be provided in the vehicle width direction central portion LM of each of the left front wheel LFW and left rear wheel LRW. Alternatively, as shown in Fig. 7, the airflow straightening member 10 on the right side R in the vehicle width direction may be provided on the vehicle width direction right side R of the vehicle width direction central portion RM of each of the right front wheel RFW and right rear wheel RRW, and the airflow straightening member 10 on the left side L in the vehicle width direction may be provided on the vehicle width direction left side L of the vehicle width direction central portion LM of each of the left front wheel LFW and left rear wheel LRW. 8, the airflow straightening member 10 on the right side R in the vehicle width direction may be provided closer to the center in the vehicle width direction than the center ends RL of the right front wheel RFW and the right rear wheel RRW, and the airflow straightening member 10 on the left side L in the vehicle width direction may be provided closer to the center in the vehicle width direction than the center ends LR of the left front wheel LFW and the left rear wheel LRW. Even in this case, when the vehicle 2 is viewed along the vehicle width direction, the airflow straightening member 10 is provided between the front wheel FW and the rear wheel RW.

[0034] In the above embodiment, the battery protection member 5 has been described as being configured to include the impact absorbing member 6. However, the battery protection member 5 can also be configured to include a bottom protection member 7. As in the above embodiment, the bottom protection member 7 corresponds to the shear panel 16, and as shown in FIG. 9 , is disposed below the battery 4 across the entire surface to protect the bottom surface of the battery 4.

[0035] In this case, as shown in Fig. 9, the underside protection member 7 may be formed as a rectangular prism extending along the longitudinal direction of the vehicle 2. In the example of Fig. 9, the interior of the rectangular prism is partitioned by a partition wall 9A extending along the longitudinal direction of the vehicle 2 so as to have a rectangular hole 9B when viewed in the longitudinal direction of the vehicle 2. Such a underside protection member 7 is preferably formed by extrusion molding using a metal containing aluminum, for example. By this extrusion molding, the underside protection member 7 is formed so as to have a hole 9B penetrating along the longitudinal direction of the vehicle 2.

[0036] In this case, the flow straightening member 10 may be provided so as to protrude downward from the underside protection member 7, as shown in Fig. 9. In such a configuration, the flow straightening member 10, which is exposed to air as the vehicle 2 travels, can cool the fluid flowing through the flow path 11. In this case, the flow straightening member 10 is formed integrally with the underside protection member 7 by extrusion molding. In this case, the underside protection member 7 and the impact absorbing member 6 may be configured integrally or separately.

[0037] Furthermore, it is preferable that the underside protection member 7 integrally form a flow path 11 through which a fluid capable of adjusting the temperature of the battery 4 flows. Adjusting the temperature of the battery 4 means maintaining the temperature of the battery 4 at a predetermined temperature (maintaining it within a predetermined temperature range), and includes cooling the battery 4 when the temperature of the battery 4 is higher than the predetermined temperature, and warming up the battery 4 when the temperature of the battery 4 is lower than the predetermined temperature. The fluid is a cooling water such as long-life coolant (LLC), insulating oil such as paraffin, or a refrigerant such as hydrofluorocarbon (HFC) or hydrofluoroolefin (HFO). In this embodiment, it is preferable to use a liquid with high electrical insulation, such as a cooling water such as long-life coolant (LLC) or insulating oil such as paraffin.

[0038] In the above embodiment, the rectifying member 10 is described as being provided so as to protrude downward from the impact absorbing member 6 of the battery protection member 5, but it may also be provided so as to protrude downward from a portion different from the impact absorbing member 6.

[0039] In the above embodiment, the straightening member 10 has been described as being configured to have a uniform length (width) along the vehicle width direction of the vehicle 2. However, the straightening member 10 may not have a uniform length (width) along the width direction of the vehicle 2, and may be provided, for example, so that the length (width) along the width direction of the vehicle 2 becomes shorter (narrower) from the front side F in the traveling direction to the rear side B in the traveling direction, or so that the length (width) along the width direction of the vehicle 2 becomes longer (thicker) from the front side F in the traveling direction to the rear side B in the traveling direction.

[0040] In the above embodiment, the air straightening member 10 has been described as being configured to have a uniform protruding height along the front-to-rear direction of the vehicle 2. However, the air straightening member 10 may be provided so that its protruding height gradually decreases from the front side F in the traveling direction of the vehicle 2 toward the rear side B in the traveling direction (i.e., so that the lower end of the air straightening member 10 on the vertical lower side D is separated from the road surface 200), or so that its protruding height gradually increases from the front side F in the traveling direction of the vehicle 2 toward the rear side B in the traveling direction of the vehicle 2 (i.e., so that the lower end of the air straightening member 10 on the vertical lower side D is closer to the road surface 200).

[0041] [Summary of the above embodiment] An outline of the vehicle underbody structure described above will now be described.

[0042] (1) The vehicle undercarriage structure includes a battery protection member 5 that protects a battery 4 mounted on the bottom 2A of the vehicle 2, and a straightening member 10 that protrudes downward from the battery protection member 5 and is arranged linearly between the front wheels FW and the rear wheels RW along the fore-and-aft direction of the vehicle 2, and the straightening member 10 is an extrusion molded product that is integrally extruded together with the battery protection member 5.

[0043] According to this configuration, when the battery protection member 5 is produced by extrusion molding, the air flow rectifying member 10 can be molded integrally with the battery protection member 5 simply by partially changing the cross-sectional shape of the extrusion mold. Furthermore, because the air flow rectifying member 10 is provided between the front wheels FW and the rear wheels RW in a state where it protrudes downward, air that has flowed between the bottom 2A of the vehicle 2 and the road surface 200 can be circulated rearward of the vehicle 2. This makes it possible to reduce the air resistance of the vehicle 2 having the battery 4 mounted on the bottom 2A. Furthermore, the air flow rectifying member 10 can be constructed inexpensively together with the battery protection member 5, making it possible to impart aerodynamic performance to the battery protection member 5. Furthermore, because the air flow rectifying member 10 and the battery protection member 5 are molded integrally, assembly to the vehicle 2 can be facilitated.

[0044] (2) In the vehicle undercarriage structure described in (1), the battery protection member 5 is preferably arranged on both outer sides of the vehicle 2 in the vehicle width direction relative to the battery 4, includes an impact absorbing member 6 that absorbs impacts from the side of the vehicle 2, and the straightening member 10 is preferably arranged in a state where it protrudes downward from the impact absorbing member 6.

[0045] According to this configuration, the airflow straightening member 10 can be produced by extrusion molding together with the impact absorbing member 6. Furthermore, when assembling the impact absorbing member 6 to the vehicle 2, the airflow straightening member 10 can also be assembled at the same time. Therefore, it becomes possible to easily assemble the airflow straightening member 10 to the vehicle 2.

[0046] (3) In the vehicle undercarriage structure described in (1) or (2), it is preferable that the battery protection member 5 is arranged below the battery 4 and includes a bottom protection member 7 that protects the bottom surface of the battery 4, and the straightening member 10 is arranged in a state where it protrudes downward from the bottom protection member 7.

[0047] According to this configuration, by mounting the rectifying member 10 on the underside protection member 7 of the battery 4, the rectifying member 10 can be exposed to wind as the vehicle 2 travels. Therefore, heat from the battery 4 can be dissipated via the rectifying member 10. In this way, the rectifying member 10 and the battery protection member 5 can integrate the underside protection function of the battery 4, the aerodynamic function, and the heat sink function, which allows for weight reduction compared to when each function is provided separately.

[0048] (4) In the vehicle underbody structure described in (3), it is preferable that the underside protection member 7 is integrally formed with a flow path 11 through which a fluid capable of adjusting the temperature of the battery 4 flows.

[0049] According to this configuration, it is possible to dissipate heat from the fluid flowing through the flow path 11 via the rectifying member 10. Therefore, it is possible to cool the fluid, whose temperature increases as the vehicle 2 travels, by utilizing the wind generated by the vehicle. [Industrial Applicability]

[0050] The technology disclosed herein can be used in vehicle undercarriage structures. [Explanation of symbols]

[0051] 2: vehicle, 2A: bottom, 4: battery, 5: battery protection device, 6: impact absorbing member, 7: underside protection member, 10: rectifying member, 11: flow path, FW: front wheel, RW: rear wheel

Claims

1. a battery protection member that protects a battery mounted on the bottom of the vehicle; a straightening member that protrudes downward from the battery protection member and is provided linearly between the front wheels and the rear wheels along the front-rear direction of the vehicle, The vehicle undercarriage, wherein the rectifying member is an extrusion molded product integrally formed with the battery protection member by extrusion molding.

2. the battery protection member is disposed on both outer sides of the battery in a vehicle width direction of the vehicle and includes an impact absorbing member that absorbs an impact from the side of the vehicle, 2. The vehicle underbody structure according to claim 1, wherein the airflow regulating member is provided so as to protrude downward from the impact absorbing member.

3. the battery protection member is disposed below the battery and includes a lower surface protection member that protects a lower surface of the battery, The vehicle underbody structure according to claim 1 or 2, wherein the airflow regulating member is provided so as to protrude downward from the underside protection member.

4. The vehicle underbody structure according to claim 3, wherein the underside protection member is integrally formed with a flow path through which a fluid capable of adjusting the temperature of the battery flows.

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