Vehicle undercarriage

Abstract

To enable a plurality of batteries arranged at a lower part of a vehicle to be dispersedly arranged appropriately.SOLUTION: A vehicle lower part structure 1 comprises: an electric-powered motor 6; a speed reducer 7 connected to the electric-powered motor 6; a pair of front-row batteries 4L and 4R that can supply electric power to the electric-powered motor 6; a pair of side members 2L and 2R arranged with an interval in a vehicle width direction; and cross members 32 and 33 extending in the vehicle width direction to connect the pair of side members 2L and 2R to each other. The cross member 33 is arranged behind the cross member 32. The pair of front-row batteries 4L and 4R are arranged with an interval from each other in the vehicle width direction. At least a portion of the speed reducer 7 is arranged between the front-row batteries 4L and 4R. The front-row batteries 4L and 4R are fixed to the cross member 32. The speed reducer 7 is supported by the cross member 33.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] The electric vehicle disclosed in Patent Document 1 has a battery box storage section provided on a chassis frame at the bottom of the vehicle. This battery box storage section houses a battery box. This battery box houses multiple batteries. An electric motor is disposed within the chassis frame below the battery box storage section. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-98517 Summary of the Invention [Problem to be solved by the invention]

[0004] However, depending on the type of vehicle, it may be difficult to secure a space for arranging a plurality of batteries together, as in the battery box storage section described above.

[0005] Therefore, an object of the present invention is to propose a suitable distributed arrangement of multiple batteries to be placed under a vehicle. [Means for solving the problem]

[0006] To achieve the above object, one aspect of the present invention provides a vehicle understructure comprising an electric motor, a reduction gear connected to the electric motor, a plurality of batteries capable of supplying power to the electric motor, a pair of side members spaced apart in the vehicle width direction, and a plurality of cross members extending in the vehicle width direction and connecting the pair of side members. In the vehicle understructure, the cross members include a first cross member and a second cross member located rearward of the first cross member, the plurality of batteries include a pair of first batteries spaced apart in the vehicle width direction, at least a portion of the reduction gear is located between the first batteries, the first batteries are fixed to the first cross member, and the reduction gear is supported by the second cross member. [Effects of the Invention]

[0007] According to one aspect of the vehicle undercarriage structure of the present invention, at least a portion of the reduction gear is disposed between the pair of first batteries. Therefore, the first batteries can reduce the impact acting on the reduction gear during a side collision, for example. This allows for an optimal distributed battery arrangement that can also function as a protection structure for the reduction gear. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a view of a vehicle underbody structure according to a first embodiment of the present invention, viewed from below. [Figure 2] 2 is a view showing a state in which a battery is fixed to a cross member as viewed from the arrow AA in FIG. 1. [Figure 3] 2 is a view showing a state in which the reducer is suspended on a cross member and a battery fixing member as viewed from the arrow BB in FIG. 1. [Figure 4] 2 is a view showing a state in which the battery is fixed to the cross member as viewed from the CC arrow in FIG. 1. [Figure 5] FIG. 6 is a view of a vehicle underbody structure according to a second embodiment of the present invention, viewed from below. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a view of a vehicle undercarriage according to a first embodiment of the present invention, as seen from below. FIG. 2 shows a state in which a battery is fixed to a cross member as viewed from the arrow AA in FIG. 1. FIG. 3 shows a state in which a reducer is suspended on the cross member and a battery fixing member as viewed from the arrow BB in FIG. 1. FIG. 4 shows a state in which a battery is fixed to a cross member as viewed from the arrow CC in FIG. 1. Note that in FIG. 2, for simplification of the illustration, a reducer 7 (described later) is shown by a two-dot chain line, and an electric motor 6, a drive shaft 8, a differential 9, and rear wheels 10 (described later) are not shown. In FIG. 3, for simplification of the illustration, the rear wheels 10 are shown by a two-dot chain line, and rear batteries 5L, 5R and a differential 9 (described later) are not shown. In FIG. 4, for simplification of the illustration, the drive shaft 8 and rear wheels 10 are shown by a two-dot chain line, and the differential 9 is not shown.

[0010] In Figures 1 and 2, the direction of arrow Fr indicates the front of the vehicle in the longitudinal direction of the vehicle. In the following explanation, "front" and "rear" correspond to the front and rear in the longitudinal direction of the vehicle. In Figures 1, 3 and 4, arrows L and R indicate the left and right sides, respectively, in the width direction of the vehicle (vehicle width direction). Here, "left and right" correspond to the "left side" and "right side" when the occupant is facing forward of the vehicle. In Figures 2 to 4, arrow D indicates the underside of the vehicle. In the following explanation, "upper" and "lower" correspond to the upper and lower sides in the vertical direction of the vehicle.

[0011] The vehicle underbody structure 1 in this embodiment is the underbody structure of an electric vehicle 50. The electric vehicle 50 may be, for example, a commercial vehicle such as a truck or a van.

[0012] The vehicle understructure 1 has a pair of side members 2L, 2R, a plurality of (five in this embodiment) cross members 31 to 35, a pair of front row batteries 4L, 4R, a pair of rear row batteries 5L, 5R, an electric motor 6, and a reduction gear 7. Note that in this embodiment, the number of cross members constituting the vehicle understructure 1 is five, but the number of cross members constituting the vehicle understructure 1 is not limited to five. The side members 2L, 2R and the cross members 31 to 35 are rigid and are made of, for example, metal.

[0013] The side members 2L, 2R are disposed at an interval in the vehicle width direction and extend in the vehicle front-rear direction. A panel member (not shown), such as a floor panel or a cargo bed panel, which constitutes the vehicle undercarriage 1, may be disposed above the side members 2L, 2R. The side members 2L, 2R may directly or indirectly support the panel member.

[0014] In this embodiment, cross members 31 to 35 are lined up in order from front to rear at intervals from one another. Each of the cross members 31 to 35 extends in the vehicle width direction so as to straddle the side members 2L and 2R. One end of each of the cross members 31 to 35 is fixed to the side member 2L, and the other end is fixed to the side member 2R.

[0015] The cross members 31, 32, 34, and 35 are, for example, square pipes having a rectangular cross section. The cross member 33 is, for example, a round pipe having a circular cross section. The cross member 33 has a curved portion 33p that is curved downwardly and convexly at its intermediate portion in the vehicle width direction (e.g., the center of the vehicle width direction). Here, the cross member 32 can be an example of a "first cross member" in the present invention. The cross member 33 can be an example of a "second cross member" in the present invention. Furthermore, the cross member 34 can be an example of a "third cross member" in the present invention. Because the cross members 31, 32, 34, and 35 are square pipes, the front batteries 4L and 4R and the rear batteries 5L and 5R can be easily fixed to them (e.g., with screws).

[0016] In this embodiment, the electric motor 6 and the reduction gear 7 are disposed directly below the cross members 31 to 33. The electric motor 6 and the reduction gear 7 are disposed between the side members 2L and 2R in a top view. The electric motor 6 and the reduction gear 7 are also disposed in a vehicle longitudinal intermediate portion (e.g., the center of the vehicle longitudinal direction) and a vehicle width intermediate portion (e.g., the center of the vehicle width direction). The reduction gear 7 is connected to the rear of the electric motor 6. A drive shaft (propeller shaft) 8 connected to a first output shaft of the reduction gear 7 extends rearward and is drivingly connected to left and right rear wheels 10 via a differential device 9. A drive shaft (propeller shaft) 11 connected to a second output shaft of the reduction gear 7 and extending forward also serves to drive left and right front wheels (not shown). Here, the reduction gear 7 reduces the rotational speed of the electric motor 6 and transmits it to the drive shafts 8 and 11. The drive shaft 8 transmits the driving force output from the electric motor 6 via the reduction gear 7 to the differential device 9.

[0017] The front-row batteries 4L, 4R and the rear-row batteries 5L, 5R are, for example, rectangular parallelepiped-shaped. The front-row batteries 4L, 4R and the rear-row batteries 5L, 5R are each capable of supplying power to the electric motor 6. The front-row batteries 4L, 4R are disposed directly below the cross members 31, 32, and are disposed between the side members 2L, 2R in a top view. The front-row batteries 4L, 4R are disposed at intervals from each other in the vehicle width direction. The rear-row batteries 5L, 5R are disposed directly below the cross members 34, 35, and are disposed between the side members 2L, 2R in a top view. The rear-row batteries 5L, 5R are disposed at intervals from each other in the vehicle width direction. Here, the front-row batteries 4L, 4R may be an example of a "first battery" in the present invention. The rear-row batteries 5L, 5R may be an example of a "second battery" in the present invention.

[0018] At least a portion of the electric motor 6, at least a portion of the reduction gear 7, and at least a portion of the drive shaft 11 are disposed between the front batteries 4L, 4R. At least a portion of the drive shaft 8 is disposed between the rear batteries 5L, 5R. In this embodiment, the rear batteries 5L, 5R are disposed behind the reduction gear 7. In this regard, at least a portion of the reduction gear 7 may be disposed between the rear batteries 5L, 5R.

[0019] The left front-row battery 4L is fixed to the cross members 31 and 32 via two front and rear battery fixing members 21L and 22L. Each of the battery fixing members 21L and 22L is a steel belt-like member that extends along the bottom surface and both left and right side surfaces of the left front-row battery 4L, forming a U-shape in a front view (viewed from the front). The battery fixing members 21L and 22L are arranged at intervals from each other in the fore-and-aft direction of the vehicle. The battery fixing member 21L supports the front portion of the left front-row battery 4L. The battery fixing member 22L supports the rear portion (e.g., the rear end portion) of the left front-row battery 4L.

[0020] The battery fixing member 21L is configured in a U-shape by a widthwise member 21La that extends in the vehicle width direction and supports the bottom surface of the left front-row battery 4L, and a pair of left and right vertical members 21Lb that rise from both ends of the widthwise member 21La. The upper end of the left vertical member 21Lb is fixed to the side member 2L, and the upper end of the right vertical member 21Lb is fixed to the cross member 31. In other words, at least one end of the battery fixing member 21L (the upper end of the right vertical member 21Lb) is fixed to the cross member 31.

[0021] The battery fixing member 22L is configured in a U-shape by a widthwise member 22La that extends in the vehicle width direction and supports the bottom surface of the left front-row battery 4L, and a pair of left and right vertical members 22Lb that rise from both ends of the widthwise member 22La. The upper end of the left vertical member 22Lb is fixed to the side member 2L, and the upper end of the right vertical member 22Lb is fixed to the cross member 32. In other words, at least one end of the battery fixing member 22L (the upper end of the right vertical member 22Lb) is fixed to the cross member 32.

[0022] The right front-row battery 4R is fixed to the cross members 31 and 32 via two front and rear battery fixing members 21R and 22R. Each of the battery fixing members 21R and 22R is a steel belt-like member that extends along the bottom surface and both left and right side surfaces of the right front-row battery 4R, forming a U-shape in a front view (viewed from the front). The battery fixing members 21R and 22R are arranged at an interval from each other in the fore-and-aft direction of the vehicle. The battery fixing member 21R supports the front portion of the right front-row battery 4R. The battery fixing member 22R supports the rear portion (e.g., the rear end portion) of the right front-row battery 4R.

[0023] The battery fixing member 21R is configured in a U-shape by a widthwise member 21Ra that extends in the vehicle width direction and supports the bottom surface of the right-side front-row battery 4R, and a pair of left and right vertical members 21Rb that rise from both ends of the widthwise member 21Ra. The upper end of the right vertical member 21Rb is fixed to the side member 2R, and the upper end of the left vertical member 21Rb is fixed to the cross member 31. In other words, at least one end of the battery fixing member 21R (the upper end of the left vertical member 21Rb) is fixed to the cross member 31.

[0024] The battery fixing member 22R is configured in a U-shape by a widthwise member 22Ra that extends in the vehicle width direction and supports the bottom surface of the right-side front-row battery 4R, and a pair of left and right vertical members 22Rb that rise from both ends of the widthwise member 22Ra. The upper end of the right vertical member 22Rb is fixed to the side member 2R, and the upper end of the left vertical member 22Rb is fixed to the cross member 32. In other words, at least one end of the battery fixing member 22R (the upper end of the left vertical member 22Rb) is fixed to the cross member 32.

[0025] The vertical members 22Lb, 22Rb of the battery fixing members 22L, 22R are inclined so that they are closer to the rear as they extend downward. Furthermore, the vertical members 22Lb, 22Rb of the battery fixing members 22L, 22R are inclined so that they are closer to the reducer 7 as they extend downward. Here, the battery fixing members 22L, 22R can be an example of a "first battery fixing member" in the present invention. Furthermore, the width members 22La, 22Ra can be an example of a "first width member" in the present invention. Furthermore, the vertical members 22Lb, 22Rb can be an example of a "first vertical member" in the present invention.

[0026] The left rear-row battery 5L is fixed to the cross members 34, 35 via two front and rear battery fixing members 24L, 25L. Each of the battery fixing members 24L, 25L is a steel belt-like member that extends along the bottom surface and both left and right side surfaces of the left rear-row battery 5L, forming a U-shape in a front view (viewed from the front). The battery fixing members 24L, 25L are arranged at intervals from each other in the longitudinal direction of the vehicle. The battery fixing member 24L supports the front portion of the left rear-row battery 5L (for example, the portion closer to the front end than the center portion in the longitudinal direction of the vehicle). The battery fixing member 25L supports the rear portion of the left rear-row battery 5L.

[0027] The battery fixing member 24L is configured in a U-shape by a widthwise member 24La that extends in the vehicle width direction and supports the bottom surface of the left rear-row battery 5L, and a pair of left and right vertical members 24Lb that rise from both ends of the widthwise member 24La. The upper end of the left vertical member 24Lb and the upper end of the right vertical member 24Lb are each fixed to the cross member 34. In other words, at least one end of the battery fixing member 24L (the upper end of the left vertical member 24Lb and the upper end of the right vertical member 24Lb) is fixed to the cross member 34.

[0028] The battery fixing member 25L is configured in a U-shape by a widthwise member 25La that extends in the vehicle width direction and supports the bottom surface of the left rear-row battery 5L, and a pair of left and right vertical members 25Lb that rise from both ends of the widthwise member 25La. The upper ends of the left vertical member 25Lb and the right vertical member 25Lb are each fixed to the cross member 35. In other words, at least one end of the battery fixing member 25L (the upper end of the left vertical member 25Lb and the upper end of the right vertical member 25Lb) is fixed to the cross member 35.

[0029] The right rear battery 5R is fixed to the cross members 34, 35 via two battery fixing members 24R, 25R at the front and rear. Each of the battery fixing members 24R, 25R is a steel belt-like member that extends along the bottom surface and both left and right side surfaces of the right rear battery 5R, forming a U-shape in a front view (viewed from the front). The battery fixing members 24R, 25R are arranged at a distance from each other in the longitudinal direction of the vehicle. The battery fixing member 24R supports the front portion of the right rear battery 5R (for example, the portion closer to the front end than the center portion in the longitudinal direction of the vehicle). The battery fixing member 25R supports the rear portion of the right rear battery 5R.

[0030] The battery fixing member 24R is configured in a U-shape by a widthwise member 24Ra that extends in the vehicle width direction and supports the bottom surface of the right-side rear-row battery 5R, and a pair of left and right vertical members 24Rb that rise from both ends of the widthwise member 24Ra. The upper ends of the left vertical member 24Rb and the right vertical member 24Rb are each fixed to the cross member 34. In other words, at least one end of the battery fixing member 24R (the upper end of the left vertical member 24Rb and the upper end of the right vertical member 24Rb) is fixed to the cross member 34.

[0031] The battery fixing member 25R is configured in a U-shape by a widthwise member 25Ra that extends in the vehicle width direction and supports the bottom surface of the right-side rear battery 5R, and a pair of left and right vertical members 25Rb that rise from both ends of the widthwise member 25Ra. The upper ends of the left vertical member 25Rb and the right vertical member 25Rb are each fixed to the cross member 35. In other words, at least one end of the battery fixing member 25R (the upper end of the left vertical member 25Rb and the upper end of the right vertical member 25Rb) is fixed to the cross member 35.

[0032] The vertical members 24Lb, 24Rb of the battery fixing members 24L, 24R are inclined so that they approach the front as they extend downward. Also, the vertical members 24Lb, 24Rb of the battery fixing members 24L, 24R are inclined so that they approach the reducer 7 as they extend downward. Here, the battery fixing members 24L, 24R can be an example of a "second battery fixing member" of the present invention. Also, the width members 24La, 24Ra can be an example of a "second width member" of the present invention. Furthermore, the vertical members 24Lb, 24Rb can be an example of a "second vertical member" of the present invention.

[0033] For example, the U-shaped battery fixing members 21L, 21R, 22L, 22R, 24L, 24R, 25L, and 25R made of steel can play a role in increasing the overall rigidity of the cross members 31, 32, 34, and 35 to which they are attached.

[0034] The reducer 7 is suspended from the cross member 33 at the curved portion 33p via a reducer mount 40 attached to the upper portion of the reducer 7. In other words, the reducer 7 is supported by the cross member 33 via the reducer mount 40.

[0035] In addition, in this embodiment, the reducer 7 is suspended from the vertical member 22Lb on the right side of the battery fixing member 22L via a reducer mount 41. This reducer mount 41 corresponds to the "first connecting member" of the present invention, and is configured to connect the reducer 7 to the battery fixing member 22L.

[0036] According to this embodiment, the vehicle undercarriage 1 includes an electric motor 6, a reduction gear 7 connected to the electric motor 6, a plurality of batteries 4L, 4R, 5L, and 5R capable of supplying power to the electric motor 6, a pair of side members 2L and 2R spaced apart in the vehicle width direction, and a plurality of cross members 31-35 extending in the vehicle width direction and connecting the pair of side members 2L and 2R. The plurality of cross members 31-35 includes a first cross member (e.g., cross member 32) and a second cross member (e.g., cross member 33) disposed behind the first cross member (e.g., cross member 32). The plurality of batteries 4L, 4R, 5L, and 5R includes a pair of first batteries (e.g., front-row batteries 4L and 4R) spaced apart in the vehicle width direction. At least a portion of the reduction gear 7 is disposed between the first batteries (e.g., front-row batteries 4L and 4R). A first battery (e.g., front-row batteries 4L, 4R) is fixed to a first cross member (e.g., cross member 32). The reduction gear 7 is supported by a second cross member (e.g., cross member 33). Therefore, the area formed by the pair of side members 2L, 2R, the first cross member (e.g., cross member 32), and the second cross member (e.g., cross member 33) has improved vehicle body rigidity, which reduces vibrations (especially low-frequency vibrations) from the reduction gear 7 and effectively suppresses rocking of the reduction gear 7. This reduction in vibration reduces noise inside the vehicle cabin. Furthermore, because the front-row batteries 4L, 4R and the reduction gear 7 are supported by the first cross member (e.g., cross member 32) and the second cross member (e.g., cross member 33), heavy objects can be distributed, which in turn makes it possible to even out the weight balance of the vehicle body. This also contributes to improving vehicle body rigidity. Furthermore, since at least a portion of the reducer 7 is disposed between the first batteries (e.g., front row batteries 4L, 4R), the impact acting on the reducer 7 in the event of a side collision, for example, can be reduced by the first batteries (e.g., front row batteries 4L, 4R).

[0037] According to this embodiment, the first battery (e.g., front-row batteries 4L, 4R) is fixed to a first cross member (e.g., cross member 32) via first battery fixing members (e.g., battery fixing members 22L, 22R). The first battery fixing members (e.g., battery fixing members 22L, 22R) are belt-like members formed into a U-shape by first widthwise members (e.g., widthwise members 22La, 22Ra) that extend in the vehicle width direction and support the bottom surfaces of the first batteries (e.g., front-row batteries 4L, 4R) and a pair of first vertical members (e.g., vertical members 22Lb, 22Rb) that rise from both ends of the first widthwise members (e.g., widthwise members 22La, 22Ra). At least one end of the first battery fixing members (e.g., battery fixing members 22L, 22R) is fixed to the first cross member (e.g., cross member 32). The first vertical members (e.g., vertical members 22Lb, 22Rb) are inclined so that the lower they are, the more rearward they become. Therefore, even if the first battery (e.g., front-row batteries 4L, 4R) tries to move rearward due to inertia during a rear-end collision, the inclined first vertical members (e.g., vertical members 22Lb, 22Rb) counter the movement of the first battery (e.g., front-row batteries 4L, 4R), thereby reducing the backward movement of the first battery (e.g., front-row batteries 4L, 4R).

[0038] Furthermore, according to this embodiment, the vehicle lower structure 1 includes a first connecting member (e.g., reducer mount 41) that connects the reducer 7 to the first battery fixing members (e.g., battery fixing members 22L, 22R). Therefore, the reducer 7 is suspended by the first cross member (e.g., cross member 32) and the second cross member (e.g., cross member 33), which further reduces the oscillation of the reducer 7.

[0039] According to this embodiment, the multiple cross members 31-35 further include a third cross member (e.g., cross member 34) disposed behind the second cross member (e.g., cross member 33). The multiple batteries 4L, 4R, 5L, 5R include at least one second battery (e.g., at least one of the rear-row batteries 5L, 5R) disposed behind the reduction gear 7. The second battery (e.g., at least one of the rear-row batteries 5L, 5R) is fixed to the third cross member (e.g., cross member 34). Therefore, the reduction gear 7, the electric motor 6, etc. can be disposed in the central region of the battery arrangement consisting of the first battery (e.g., front-row batteries 4L, 4R) and the second battery (e.g., at least one of the rear-row batteries 5L, 5R), thereby protecting the high-voltage wiring in the event of a frontal collision, a rear collision, and / or a side collision.

[0040] According to this embodiment, the multiple cross members 31-35 further include a third cross member (e.g., cross member 34) disposed behind the second cross member (e.g., cross member 33). The multiple batteries 4L, 4R, 5L, 5R include a pair of second batteries (e.g., rear-row batteries 5L, 5R) disposed behind the reduction gear 7 and spaced apart in the vehicle width direction. The second batteries (e.g., rear-row batteries 5L, 5R) are fixed to the third cross member (e.g., cross member 34). Therefore, the reduction gear 7, the electric motor 6, etc. can be disposed in the central region of the battery arrangement consisting of the first battery (e.g., front-row batteries 4L, 4R) and the second battery (e.g., rear-row batteries 5L, 5R), thereby protecting the high-voltage wiring in the event of a frontal collision, a rearward collision, and / or a side collision.

[0041] According to this embodiment, the second battery (e.g., rear-row batteries 5L, 5R) is fixed to a third cross member (e.g., cross member 34) via second battery fixing members (e.g., battery fixing members 24L, 24R). The second battery fixing members (e.g., battery fixing members 24L, 24R) are belt-like members formed into a U-shape by second widthwise members (e.g., widthwise members 24La, 24Ra) that extend in the vehicle width direction and support the bottom surfaces of the second batteries (e.g., rear-row batteries 5L, 5R) and a pair of second vertical members (e.g., vertical members 24Lb, 24Rb) that rise from both ends of the second widthwise members (e.g., widthwise members 24La, 24Ra). At least one end of the second battery fixing member (e.g., battery fixing member 24L, 24R) is fixed to the third cross member (e.g., cross member 34). The second vertical members (e.g., vertical members 24Lb, 24Rb) are inclined so that the lower they are, the more forward they are. Therefore, even if the second battery (e.g., rear-row batteries 5L, 5R) attempts to move forward due to inertia during a frontal collision, the inclined second vertical members (e.g., vertical members 24Lb, 24Rb) counteract the movement of the second battery (e.g., rear-row batteries 5L, 5R), thereby reducing the forward movement of the second battery (e.g., rear-row batteries 5L, 5R). This reduces interference between the reducer 7 and the second battery (e.g., rear-row batteries 5L, 5R).

[0042] Next, a second embodiment of the present invention will be described with reference to Fig. 5. Fig. 5 is a view of the vehicle underbody structure in this embodiment as seen from below. Differences from the first embodiment described above will be described.

[0043] In this embodiment, the reducer 7 is connected to the width direction member 24La of the battery fixing member 24L via the reducer mount 42L, and is connected to the width direction member 24Ra of the battery fixing member 24R via the reducer mount 42R. These reducer mounts 42L, 42R correspond to the "second connecting member" of the present invention, and are configured to connect the reducer 7 to the battery fixing members 24L, 24R.

[0044] In particular, according to this embodiment, the vehicle undercarriage 1 includes a second connecting member (e.g., reducer mounts 42L, 42R) that connects the reducer 7 to the second battery fixing members (e.g., battery fixing members 24L, 24R). Therefore, the reducer 7 is further suspended by a third cross member (e.g., cross member 34), which further reduces the oscillation of the reducer 7.

[0045] In the first and second embodiments described above, the vertical members 21Lb, 21Rb of the battery fixing members 21L, 21R may be inclined so as to be more rearward as they extend downward, or so as to be more forward as they extend downward. Similarly, the vertical members 25Lb, 25Rb of the battery fixing members 25L, 25R may be inclined so as to be more rearward as they extend downward, or so as to be more forward as they extend downward.

[0046] In the first and second embodiments described above, at least a portion of the electric motor 6 and at least a portion of the reduction gear 7 were arranged between the front batteries 4L and 4R, but instead, at least a portion of the electric motor 6 and at least a portion of the reduction gear 7 may be arranged between the rear batteries 5L and 5R.

[0047] In the first and second embodiments described above, an example was shown in which two rear-row batteries 5L, 5R are arranged behind the reducer 7, but the number of rear-row batteries arranged behind the reducer 7 is not limited to two, and may be one, or three or more. When there is one rear-row battery arranged behind the reducer 7, for example, one of the rear-row batteries 5L, 5R may be omitted in the first and second embodiments described above. Alternatively, in the first and second embodiments described above, the rear-row batteries 5L, 5R may be integrated and configured to straddle the center portion in the vehicle width direction.

[0048] In the first and second embodiments described above, when a power generation unit is mounted on the electric vehicle 50 and used as a range extender, the power generation unit may be disposed, for example, in the rear vehicle body 49. In this case, the power generation unit may be disposed between the side members 2L, 2R in a top view. The power generation unit may also be disposed lower than the side members 2L, 2R and behind the differential device 9. Electric power generated by the power generation unit may be used to charge the front batteries 4L, 4R and the rear batteries 5L, 5R.

[0049] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and further modifications and changes are possible based on the technical concept of the present invention. [Explanation of symbols]

[0050] 1... vehicle lower structure, 2L, 2R... side members, 4L, 4R... front row battery (first battery), 5L, 5R... rear row battery (second battery), 6... electric motor, 7... reduction gear, 8... drive shaft, 9... differential device, 10... rear wheel, 11... drive shaft, 21L, 21R... battery fixing member, 21La, 21Ra... width direction member, 21Lb, 21Rb... vertical direction member, 22L, 22R... battery fixing member (first battery fixing member), 22La, 22Ra... width direction member (first width direction member), 22Lb, 22Rb... vertical direction member (first vertical direction member), 24L, 24R... battery fixing member (second battery fixing material), 24La, 24Ra... width direction material (second width direction material), 24Lb, 24Rb... vertical direction material (second vertical direction material), 25L, 25R... battery fixing material, 25La, 25Ra... width direction material, 25Lb, 25Rb... vertical direction material, 31... cross member, 32... cross member (first cross member), 33... cross member (second cross member), 33p... curved portion, 34... cross member (third cross member), 35... cross member, 40... reducer mount, 41... reducer mount (first connecting member), 42L, 42R... reducer mount (second connecting member), 49... rear of vehicle body, 50... electric vehicle

Claims

1. A vehicle understructure including an electric motor, a reduction gear connected to the electric motor, a plurality of batteries capable of supplying power to the electric motor, a pair of side members arranged at intervals in a vehicle width direction, and a plurality of cross members extending in the vehicle width direction and connecting the pair of side members, the plurality of cross members include a first cross member and a second cross member disposed rearward of the first cross member; the plurality of batteries include a pair of first batteries spaced apart in the vehicle width direction, At least a portion of the reducer is disposed between the first batteries, the first battery is fixed to the first cross member; the reducer is supported by the second cross member; the first battery is fixed to the first cross member via a first battery fixing member; the first battery fixing member is a belt-like member configured in a U-shape by a first widthwise member extending in the vehicle width direction and supporting a bottom surface of the first battery, and a pair of first vertical members rising from both ends of the first widthwise member; At least one end of the first battery fixing member is fixed to the first cross member, The vehicle undercarriage structure is characterized in that the first vertical member is inclined so as to be more rearward as it extends downward.

2. The vehicle underbody structure according to claim 1, further comprising a first connecting member that connects the reducer to the first battery fixing member.

3. the plurality of cross members further includes a third cross member disposed rearward of the second cross member; the plurality of batteries includes at least one second battery disposed behind the reducer; 3. The vehicle underbody structure according to claim 1, wherein the second battery is fixed to the third cross member.

4. the plurality of cross members further includes a third cross member disposed rearward of the second cross member; the plurality of batteries include a pair of second batteries arranged rearward of the reducer and spaced apart in the vehicle width direction, 3. The vehicle underbody structure according to claim 1, wherein the second battery is fixed to the third cross member.

5. A vehicle undercarriage comprising an electric motor, a reduction gear connected to the electric motor, a plurality of batteries capable of supplying power to the electric motor, a pair of side members spaced apart in the vehicle width direction, and a plurality of cross members extending in the vehicle width direction and connecting the pair of side members, the plurality of cross members include a first cross member and a second cross member disposed rearward of the first cross member; the plurality of batteries include a pair of first batteries spaced apart in the vehicle width direction, At least a portion of the reducer is disposed between the first batteries, the first battery is fixed to the first cross member; the reducer is supported by the second cross member; the plurality of cross members further includes a third cross member disposed rearward of the second cross member; the plurality of batteries includes at least one second battery disposed behind the reducer; the second battery is fixed to the third cross member; the second battery is fixed to the third cross member via a second battery fixing member; the second battery fixing member is a belt-like member configured in a U-shape by a second widthwise member extending in the vehicle width direction and supporting a bottom surface of the second battery, and a pair of second vertical members rising from both ends of the second widthwise member, At least one end of the second battery fixing member is fixed to the third cross member, The vehicle undercarriage structure is characterized in that the second vertical member is inclined so as to be more forward as it extends downward.

6. A vehicle undercarriage structure comprising an electric motor, a reduction gear connected to the electric motor, a plurality of batteries capable of supplying power to the electric motor, a pair of side members spaced apart in the vehicle width direction, and a plurality of cross members extending in the vehicle width direction and connecting the pair of side members, the plurality of cross members include a first cross member and a second cross member disposed rearward of the first cross member; the plurality of batteries include a pair of first batteries spaced apart in the vehicle width direction, At least a portion of the reducer is disposed between the first batteries, the first battery is fixed to the first cross member; the reducer is supported by the second cross member; the plurality of cross members further includes a third cross member disposed rearward of the second cross member; the plurality of batteries include a pair of second batteries arranged rearward of the reducer and spaced apart in the vehicle width direction, the second battery is fixed to the third cross member; the second battery is fixed to the third cross member via a second battery fixing member; the second battery fixing member is a belt-like member configured in a U-shape by a second widthwise member extending in the vehicle width direction and supporting a bottom surface of the second battery, and a pair of second vertical members rising from both ends of the second widthwise member, At least one end of the second battery fixing member is fixed to the third cross member, The vehicle undercarriage structure is characterized in that the second vertical member is inclined so as to be more forward as it extends downward.

7. 7. The vehicle underbody structure according to claim 5, further comprising a second connecting member that connects the reducer to the second battery fixing member.

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