JP7020352B2 - Undercarriage of electric vehicle - Google Patents

Description

The present invention relates to a lower structure of an electric vehicle provided with a battery pack on the bottom surface of the vehicle.

An electric vehicle powered by a rotary electric machine is equipped with a battery pack as a power source. For example, in Patent Document 1, a battery pack is housed under the floor panel.

When the vehicle travels on a flooded road (flooded road), water may enter the battery pack. Therefore, in Patent Document 1, drain holes are provided at both ends of the bottom wall of the battery pack in the vehicle width direction.

Japanese Unexamined Patent Publication No. 2013-19185

By the way, in order to protect the battery pack, as illustrated in FIG. 4, the side and the lower side of the battery pack 100 may be covered with a cover (battery undercover 200). Similar to the battery pack 100, water may enter between the battery undercover 200 and the battery pack 100 when the vehicle travels on a submerged road. Therefore, it is conceivable to provide a drain hole on the bottom wall of the battery undercover 200.

Here, the flow of water on the inner surface (the surface facing the battery pack 100) of the bottom wall of the battery undercover 200 depends on the three-dimensional shape such as unevenness formed on the inner surface of the bottom wall and the side wall of the battery undercover 200. It is decided.

For example, as shown in FIG. 4, in order to avoid contact with the jack, the side wall 202 of the battery undercover 200 is located adjacent to the jack-up points 206A and 206A of the rockers 206 and 206 inward in the vehicle width direction. A recess 204 is formed to be pulled inward in the vehicle width direction. In this case, as shown by the streamline L2, the water flowing backward when the vehicle moves forward changes its flow inward in the vehicle width direction when it hits the recess 204. As a result, water tends to collect in the inner region of the recess 204 in the vehicle width direction.

Therefore, it is an object of the present invention to provide a substructure of an electric vehicle capable of efficiently performing drainage in a region where water tends to collect, which is caused by the three-dimensional shape of the battery undercover.

The present invention relates to a substructure of an electric vehicle. The undercarriage comprises a battery pack and a battery undercover. The battery pack is installed under the floor panel and sandwiched between a pair of rockers provided at both ends of the vehicle in the vehicle width direction and extending in the vehicle front-rear direction. The battery undercover covers the sides and bottom of the battery pack. The battery undercover includes a cover bottom wall extending in the vehicle width direction and the vehicle front-rear direction, and a cover side wall connected to both ends of the cover bottom wall in the vehicle width direction and extending upward in the vehicle vertical direction. On the side wall of the cover, a recess is formed in a portion adjacent to the inside in the vehicle width direction from the jack-up point provided on the rocker so as to be drawn inward in the width direction of the vehicle from the side wall of the cover in the front-rear direction of the vehicle. A plurality of drainage holes are arranged in the front-rear direction of the vehicle in the center of the bottom wall of the cover in the vehicle width direction. The arrangement pitch of the drainage holes formed inward in the vehicle width direction from the recess in the vehicle front-rear direction is shorter than the arrangement pitch of the other plurality of drainage holes.

According to the above configuration, drainage holes are formed in the inner portion in the vehicle width direction from the recess, and the arrangement pitch in the vehicle front-rear direction is made shorter than the arrangement pitch of the other plurality of drainage holes. By gathering the drain holes from the concave portion to the inner portion in the vehicle width direction, which is a region where water easily collects, the drainage of the portion can be efficiently performed.

According to the present invention, it is possible to efficiently perform drainage in a region where water tends to collect, which is caused by the three-dimensional shape of the battery undercover.

It is a bottom view which illustrates the lower structure of the electric vehicle which concerns on this embodiment. It is a perspective view which illustrates the right side part in the vehicle width direction of a battery undercover. FIG. 1 is a sectional view taken along the line AA of FIG. 1 and is a rear sectional view illustrating a state at the time of jacking up. It is a bottom view which illustrates the lower structure of the electric vehicle which concerns on the prior art.

FIG. 1 illustrates a bottom view of the lower structure of the electric vehicle according to the present embodiment. In FIGS. 1 to 3, the vehicle front-rear direction is indicated by the axis represented by the symbol FR, the vehicle width direction is indicated by the axis represented by the symbol RW, and the vehicle vertical direction is indicated by the axis represented by the symbol UP. .. The vehicle front-rear axis FR has a positive direction in the vehicle front direction. The vehicle width axis RW has the right width direction as the positive direction. Further, the vehicle vertical axis UP has an upward direction as a positive direction. These three axes are orthogonal to each other.

The vehicle exemplified in FIG. 1 is an electric vehicle whose drive source is a rotary electric machine and whose power source is a battery pack 10. The lower structure of the electric vehicle according to the present embodiment includes a battery pack 10, rockers 20A, 20B, and a battery undercover 30.

As illustrated in FIG. 1, in the electric vehicle according to the present embodiment, the battery pack 10 is installed under the floor, that is, under the floor panel. The battery pack 10 is relatively large and has an area that occupies most of the underfloor of the vehicle interior. For example, the battery pack 10 extends from the front suspension member 65 to the rear suspension member 66.

The battery pack 10 is installed under the floor panel so as to be sandwiched between the pair of rockers 20A and 20B. The rockers 20A and 20B are skeleton members installed at both ends of the vehicle in the vehicle width direction and extended in the vehicle front-rear direction.

The rockers 20A and 20B are made of high-rigidity steel plates such as high-strength steel plates and hot stamping materials. FIG. 3 exemplifies a rear view sectional view around the jack-up point 22A on the right side in the vehicle width direction. The rocker 20A is a divided body divided in the vehicle width direction, and includes a rocker outer 20A1 provided on the outer side in the vehicle width direction and a rocker inner 20A2 provided on the inner side in the vehicle width direction. A closed cross section is formed by joining the rocker inner 20A2 and the rocker outer 20A1.

With reference to FIG. 1, the rockers 20A and 20B are provided with jack-up points 22A and 22B. The jack-up points 22A and 22B are provided, for example, in the rear portion of the rockers 20A and 20B, in other words, in the vicinity of the rear tire 63.

As illustrated in FIG. 3, the bottom surfaces of the jack-up points 22A and 22B are surfaces that receive the stage 72 of a jack 70 such as a pantograph jack. Since the weight of the vehicle is applied to the jack-up points 22A and 22B during jack-up, the jack-up points 22A and 22B are configured to have higher rigidity than the peripheral members thereof.

Further, for example, at the jack-up points 22A and 22B of the rockers 20A and 20B, as illustrated in FIG. 3, the bottom surface of the rockers 20A may be flattened and used as a receiving surface of the stage 72.

With reference to FIG. 1, the bottom surface of the vehicle is covered with an undercover. The undercover includes a battery undercover 30 and a rear undercover 60. In addition, in FIG. 1, the illustration of the fastening hole for fastening the undercover to the panel member or the skeleton member of the vehicle is omitted.

The front end of the rear undercover 60 is provided behind the rear suspension member 66, and the rear end is connected to the lower end of the rear bumper guard 62.

The battery undercover 30 covers the sides and the bottom of the battery pack 10 and protects the battery pack 10 from water and pebbles scattered from the road surface.

With reference to FIGS. 1 and 2, the battery undercover 30 has a boat-shaped structure, and has a horizontal plane (RW-FR plane), that is, a cover bottom wall 31 extending in the vehicle width direction and the vehicle front-rear direction, and a cover. The cover side walls 32A and 32B connected to both ends of the bottom wall 31 in the vehicle width direction and extended upward in the vehicle vertical direction are provided.

Further, with reference to FIG. 3, as shown by the height difference H1 between the cover bottom wall 31 and the bottom walls of the rockers 20A and 20B, the cover bottom wall 31 is below the bottom wall of the rockers 20A and 20B. Overhang.

In the positional relationship between the cover bottom wall 31 and the bottom walls of the rockers 20A and 20B as described above, the arm 74 of the jack 70 may come into contact with the cover bottom wall 31 at the time of jacking up. Therefore, referring to FIG. 2, the cover side walls 32A and 32B are located adjacent to the jack-up points 22A and 22B of the rockers 20A and 20B inward in the vehicle width direction, and are more than the cover side walls 32A and 32B in the vehicle front-rear direction. Recesses 51A and 51B that are pulled inward in the vehicle width direction are formed. The detailed structure of the recesses 51A and 51B will be described later.

Further, a plurality of drain holes 80A to 87A and 80B to 87B are drilled in the center of the cover bottom wall 31 in the vehicle width direction. The drainage holes 80A to 87A and 80B to 87B are formed, for example, in pairs (for example, drainage holes 80A, 80B, etc.) arranged side by side in the vehicle width direction. Further, the drain holes 80A to 87A and the drain holes 80B to 87B are arranged in the front-rear direction of the vehicle, respectively.

The arrangement pitches of the drainage holes 80A to 87A and the drainage holes 80B to 87B in the vehicle front-rear direction are not evenly spaced through all the drainage holes 80A to 87A and the drainage holes 80B to 87B, so that the intervals are partially different. It is considered to be an irregular pitch. Specifically, the drainage holes 85A and 86A formed inside the recesses 51A and 51B in the vehicle width direction and arranged in the vehicle front-rear direction and the arrangement pitch P4 of the drainage holes 85B and 86B are other drainage holes 80A to 84A and 87A. The drainage holes 80A to 87A and the drainage holes 80B to 87B are formed so as to be shorter than the arrangement pitches P1, P2, P3, and P5 of the drainage holes 80B to 84B and 87B. By providing such a structure, water flowing inward in the vehicle width direction can be efficiently discharged from the recesses 51A and 51B. The detailed structures of the drain holes 80A to 87A and the drain holes 80B to 87B will be described later.

With reference to FIGS. 1 and 2, the battery undercover 30 is divided into a plurality of cover pieces in consideration of ease of maintenance and the like. For example, as illustrated in FIG. 1, the battery undercover 30 is divided into seven cover pieces. Specifically, the battery undercover 30 includes a cover piece top 40, a cover piece center front 41, a cover piece side front 42A, 42B, a cover piece center rear 43, and a cover piece side rear 50A, 50B from the front to the rear of the vehicle. Be prepared.

The cover piece top 40 is provided close to the front suspension member 65, and the front end portion is an arch-shaped member when viewed from the bottom. The front end of the cover piece center front 41 is connected to the rear end of the cover piece top 40 and is arranged at the center in the vehicle width direction. The inner ends of the cover piece side fronts 42A and 42B in the vehicle width direction are connected to the outer ends of the cover piece center front 41 in the vehicle width direction.

Similarly, the front end of the cover piece center rear 43 is connected to the rear end of the cover piece center front 41 and is arranged at the center in the vehicle width direction. The inner ends of the cover piece side rears 50A and 50B in the vehicle width direction are connected to the outer ends of the cover piece center rear 43 in the vehicle width direction. Further, the front ends of the cover piece side rears 50A and 50B in the vehicle front-rear direction are connected to the vehicle front-rear rear ends of the cover piece side fronts 42A and 42B.

FIG. 2 illustrates a perspective view of the right side portion of the battery undercover 30 in the vehicle width direction. Due to the symmetry of the vehicle structure, the left side portion of the battery undercover 30 in the vehicle width direction has the same configuration. In the following description, if the suffix "A" at the end of the reference numeral is changed to "B", the left side portion of the battery undercover 30 in the vehicle width direction will be described.

Although the inner surface of the battery undercover 30, that is, the surface facing the battery pack 10 is illustrated in FIG. 2, the flanges provided on the inner surface for connecting the cover pieces to each other and the cover pieces on the vehicle body are illustrated. The illustration is omitted for the fastening holes and the like for fastening the above.

The cover piece side rear 50A includes a cover bottom wall piece 52A and a cover side wall piece 53A. The cover bottom wall piece 52A constitutes a part of the cover bottom wall 31 of the battery undercover 30. Similarly, the cover side wall piece 53A constitutes a part of the cover side wall 32A of the battery undercover 30.

A recess 51A is formed in the cover side wall piece 53A. With reference to FIGS. 1 to 3, the recess 51A is formed in a portion of the cover side wall piece 53A adjacent to the inside of the rocker 20A from the jack-up point 22A in the vehicle width direction. The recess 51A has a structure that is retracted inward in the vehicle width direction from the cover side wall piece 53A in the vehicle front-rear direction.

With reference to FIG. 2, for example, the recess 51A has a slope-like inclined shape when viewed from the front, which becomes lower toward the inside in the vehicle width direction, in other words, approaches the cover bottom wall piece 52A. With reference to FIG. 3, for example, the inclined surface 51A1 of the recess 51A may be along the pantograph shape of the jack 70, and may be formed according to the inclination of the arm 74 of the jack 70.

With reference to FIG. 2, the cover bottom wall piece 41A of the cover piece center front 41 and the cover bottom wall piece 43A of the cover piece center rear 43 are perforated with a plurality of drain holes 80A to 87A in the center in the vehicle width direction. To. The drainage holes 80A to 87A may be, for example, long holes having a long axis in the vehicle width direction, and the dimensions and shapes of the drainage holes 80A to 87A may be the same.

The drain holes 80A to 87A are arranged in the front-rear direction of the vehicle. The arrangement pitch is not a so-called equal pitch that is uniform over all the drain holes 80A to 87A, but a partially uneven irregular pitch.

Specifically, the drain holes 80A and 81A, the drain holes 81A and 82A, and the drain holes 82A and 83A have the same arrangement pitch P1. On the other hand, the arrangement pitch P2 of the drain holes 83A and 84A, the arrangement pitch P3 of the drain holes 84A and 85A, the arrangement pitch P4 of the drain holes 85A and 86A, and the arrangement pitch P5 of the drain holes 86A and 87A all have different values.

The arrangement pitch P2 of the drain holes 83A and 84A is set to be shorter than the arrangement pitch P1 in front of the arrangement pitch P2. Further, the arrangement pitch P3 of the drain holes 84A and 85A is set to be longer than the arrangement pitches P1 and P2 in front of the drain holes 84A and 85A. Further, the arrangement pitch P4 of the drain holes 85A and 86A is set to be shorter than any of the arrangement pitches P1, P2, P3 and P5 of the other drain holes. Further, the arrangement pitch P5 of the drain holes 86A and 87A is set to be longer than any of the arrangement pitches P1 to P4 of the other drain holes.

Here, the drain holes 85A and 86A arranged at the minimum arrangement pitch P4 are formed inside the recess 51A in the vehicle width direction. In other words, the drain holes 85A and 86A are formed so that the recesses 51A and the vehicle front-rear position coincide with each other.

In this way, when forming the drain holes 85A and 86A inside the recess 51A in the vehicle width direction, the width W1 of the recess 51A in the vehicle front-rear direction is wider than the array pitch P4 with reference to FIG. W1 and the arrangement pitch P4 are defined.

As described above, the water flowing on the inner surfaces of the cover one side front 42A and the cover one side rear 50A flows rearward in the front-rear direction of the vehicle when the vehicle advances. Further, as illustrated by the streamline L1, when the recess 51A is hit, the flow of water changes inward in the vehicle width direction. The water flowing inside the vehicle width flows directly into the drain holes 85A and 86A and is discharged to the outside of the vehicle.

As described above, in the lower structure of the electric vehicle according to the present embodiment, the drainage holes are centrally arranged in the places where water is relatively collected by providing the recess 51A. This enables efficient drainage to the outside of the vehicle.

10 Battery pack, 20A, 20B locker, 22A, 22B jack-up point, 30 battery undercover, 31 cover bottom wall, 32A, 32B cover side wall, 40 cover piece top, 41 cover piece center front, 41A cover piece center front cover Bottom wall piece, 42A, 42B cover piece side front, 43 cover piece center rear, 43A cover piece center rear cover bottom wall piece, 50A, 50B cover piece side rear, 51A, 51B recess, 52A cover piece side rear cover bottom wall piece, 53A Cover piece Side Rear cover side wall piece, 80A-87A, 80B-87B drain holes.

Claims (1)

A battery pack under the floor panel that is sandwiched between a pair of rockers that are installed at both ends of the vehicle in the vehicle width direction and extend in the front-rear direction of the vehicle.
A battery undercover that covers the sides and bottom of the battery pack,
It is a substructure of an electric vehicle equipped with
The battery undercover includes a cover bottom wall extending in the vehicle width direction and the vehicle front-rear direction, and a cover side wall connected to both ends of the cover bottom wall in the vehicle width direction and extending upward in the vehicle vertical direction. Prepare,
On the cover side wall, a recess is formed in a portion adjacent to the inside in the vehicle width direction from the jack-up point provided on the rocker, and a recess is formed in the vehicle width direction inward from the cover side wall in the vehicle front-rear direction.
A plurality of drain holes are arranged in the front-rear direction of the vehicle at the center of the bottom wall of the cover in the vehicle width direction.
The arrangement pitch of the drain holes formed inward in the vehicle width direction from the recess in the vehicle front-rear direction is shorter than the arrangement pitch of the other plurality of other drain holes.
Substructure of electric vehicle.

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