JP3440867B2 - Lower body structure of electric vehicle - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an underbody structure of an electric vehicle.

[0002]

2. Description of the Related Art In an electric vehicle, a battery for driving a motor occupies a considerable weight and a mounting space. Therefore, conventionally, a plurality of batteries are housed in a dedicated battery case, and the battery case is mounted on the vehicle floor. The lower side is fastened and fixed to a floor frame member such as a side member and a cross member so that the battery is mounted on the lower side of the vehicle body floor (as a similar structure, there is JP-A-9-99867).

[0003]

As described above, since the battery case is mounted on the lower side of the vehicle body floor, the battery case interferes with an obstacle or the like on the road surface (road surface interference) when the vehicle is traveling, and the battery case. And, it may give a shock to the contained battery.

In order to avoid such a road surface interference of the battery case, it is sufficient to dispose an underguard member, but this is unavoidable in terms of cost.

Therefore, the present invention provides a lower body structure of an electric vehicle capable of avoiding road surface interference of a battery case below the vehicle body floor without providing a dedicated underguard member.

[0006]

According to the invention of claim 1, the battery case is fastened and fixed to the floor frame member on the lower side of the vehicle body floor, and a pair of left and right front and rear members are offset from the battery case in the front-rear direction. In the structure in which the suspension unit is arranged on the directional frame member and the stabilizer is arranged so as to straddle these suspension units, the ground height of the intermediate portion of the stabilizer is set lower than the lower edge of the battery case. It has a feature.

The invention of claim 2 is characterized in that the stabilizer according to claim 1 is a stabilizer for a front suspension arranged in front of the battery case.

According to a third aspect of the present invention, the stabilizer according to the first aspect is a stabilizer for a rear suspension arranged rearward of the battery case.

In the invention of claim 4, claims 1 to 3
The stabilizer described in 1 is configured such that an intermediate portion thereof has a shape along a vehicle width direction frame member disposed in the vicinity of the suspension unit, and the intermediate portion of the stabilizer is supported by the vehicle width direction frame member via a mount bracket. It is characterized by having done.

According to the invention of claim 5, a plurality of mount brackets according to claim 4 are provided.

According to the invention of claim 6, claims 4 and 5 are provided.
The lower edge of the mount bracket described in (1) is set lower than the lower edge of the battery case.

In the invention of claim 7, claims 4 to 6 are provided.
In the vehicle width direction frame member that supports the intermediate portion of the stabilizer described in (1), a jack-up point bracket is provided.

The invention of claim 8 is characterized in that the lower edge of the jack-up point bracket of the seventh aspect is set to substantially the same ground clearance as the lower edge of the intermediate portion of the stabilizer.

According to the invention of claim 9, claims 1 to 8 are provided.
It is characterized in that the stabilizer described in (1) is connected across the lower members of the left and right suspension units.

[0015]

According to the first, second and third aspects of the present invention, the height of the ground in which the intermediate portion of the stabilizer is disposed is set lower than the lower edge of the battery case, so that the vehicle runs. If there is an obstacle on the road surface, the intermediate part of the stabilizer will preempt this obstacle and let the driver know the existence of the obstacle.
By stopping the vehicle before the battery case collides with an obstacle or the like, road surface interference of the battery case can be prevented in advance.

Further, without using a dedicated underguard member or the like, the effective use of the stabilizer of the suspension unit enables confirmation of obstacles and avoiding road surface interference of the battery case, which is advantageous in terms of cost and weight. be able to.

According to the invention of claim 4, claim 1
In addition to the effects of the inventions of 3 to 3, since the intermediate portion of the stabilizer is supported by the vehicle width direction frame member by the mount bracket, the input when the intermediate portion of the stabilizer interferes with an obstacle or the like is transmitted in the vehicle width direction frame. Since the member can be loaded, the input transmission to the suspension unit can be suppressed as small as possible to protect the suspension unit.

According to the invention of claim 5, claim 4
In addition to the effect of the invention described above, since a plurality of mount brackets are provided, it is possible to enhance the support stability of the stabilizer.

According to the invention described in claim 6, in addition to the effects of the inventions of claims 4 and 5, the obstacle can be confirmed by the mount bracket, so that the road surface interference of the battery case can be more effectively avoided. be able to.

According to the invention described in claim 7, claim 4
In addition to the effects of the inventions of to 6, since the vehicle width direction frame member supporting the stabilizer is provided with the jack up point bracket, the jack up point becomes clear when the vehicle is inspected and the head portion of the jack is Can be engaged with the jack-up point bracket to easily and quickly carry out the jack-up work of the vehicle.

According to the invention described in claim 8, claim 7 is provided.
In addition to the effect of the present invention, the obstacle can be confirmed by the jack-up point bracket, so that the road surface interference of the battery case can be avoided more effectively.

According to the invention of claim 9, claim 1
In addition to the effects of the inventions of 8 to 8, since the stabilizer is connected to the lower member which is located at the lowest position in the suspension unit and can easily secure the installation space, the layout flexibility can be increased.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 6, reference numeral 1 denotes a battery case in which a plurality of batteries are hermetically housed.
Is firmly fastened and fixed to the floor frame members F and M provided on the lower surface of the vehicle body floor 2 by fastening members such as bolts.

Reference numeral 3 is a front side member as a pair of left and right front and rear skeletal members joined and arranged along the lower side of the hood ridge panel 4 which separates the side portions of the motor rooms M and R, and the rear end thereof is the motor. It is joined to a dash panel 5 that separates the room MR from the passenger compartment R.

The front side member 3 is provided with a suspension mount member 6, and a first cross member 7 as a vehicle width direction frame member is connected and arranged across the front end portions.

Reference numeral 8 denotes the left and right front suspension units, and the shock absorber 9 is coupled to and supported by the strut tower 4a of the hood ridge panel 4, and
The lower link 10 is connected to and supported by the suspension mount member 6.

Left and right front suspension units 8
Is connected by a stabilizer 11 across the lower links 10, 10 which are lower members.

The stabilizer 11 is formed in a substantially U-shape in plan view so that an intermediate portion thereof extends along the first cross member 7, and the intermediate portion is located below the first cross member 8 via a plurality of mount brackets 12. Is supported by.

In the present embodiment, the two mount brackets 12 hold the first cross member 8 at the left and right ends near the bent portion of the stabilizer 11 which is substantially U-shaped in plan view.

The stabilizer 11 has a ground height h ₁ at its middle portion set lower than the ground height h _{2 at} the lower edge of the battery case 1 (see FIG. 4).

In this embodiment, the brackets 12 on both sides are
Downwardly projecting portion 11 in the vicinity of the portion held by 12
a is bent, and the lower edge height h of these protruding portions 11a is increased.
₁ is set to be lower than the lower edge height h ₂ of the battery case 1.

Further, in this embodiment, the bead portion 12 is provided at the center of the outer periphery of the left and right mount brackets 12, 12.
a is formed by projection so that the lower edge height of the mount brackets 12, 12 is the same as the lower edge height h ₁ of the protrusion 11a of the stabilizer 11 by the bead portion 12a.

Further, a jack-up point bracket 13 is joined and fixed to the front edge portion of the lower surface at the substantially central portion of the first cross member 7, and a jack (not shown) is attached to the lower surface of the jack-up point bracket 13 when the vehicle is jacked up. The head portion is abutted and engaged so that it can be jacked up. With respect to the jack-up point bracket 13, the lower edge of the jack-up point bracket 13 is lower than the lower edge of the battery case 1, so that the protruding portion of the stabilizer 11 is provided. It is set to the same level as the lower edge height h _{1 of} 11a.

In the figure, W indicates a wheel.

According to the structure of the above embodiment, the ground clearance h ₁ of the intermediate portion of the stabilizer 11 of the front suspension unit 8 is set to the ground clearance at the lower edge of the battery case 1 mounted below the vehicle body floor 2. Since it is set lower than h ₂ , if there is an obstacle or the like on the road surface on which the vehicle is traveling forward, the intermediate portion of the stabilizer 11 will hit the obstacle or the like in advance, and the driver will be obstructed or the like. Since it is possible to confirm the existence of the battery case 1, it is possible to prevent road surface interference of the battery case 1 by stopping the vehicle before the battery case 1 collides with an obstacle or the like.

Further, without using a dedicated under guard member or the like, the stabilizer 11 of the front suspension unit 8 can be effectively used to check obstacles and avoid road surface interference of the battery case 1. Therefore, the cost and weight are increased. Can be advantageously obtained.

In this embodiment, in particular, the stabilizer 11 is formed in a substantially U-shape in plan view so that the intermediate portion thereof extends along the first cross member 7, and the intermediate portion is formed on the lower surface of the first cross member 7 on both left and right sides thereof. Since it is stably supported via the mount bracket 12, the first cross member 7 can surely bear the input when the intermediate portion of the stabilizer 11 interferes with an obstacle or the like. The front suspension unit 8 can be protected by suppressing the input transmission to the unit 8 as small as possible.

The lower surface height of each of the mount brackets 12 provided on the lower surfaces of both sides of the first cross member 7 and the jack-up point bracket 13 joined and arranged on the lower surface of the central portion is the lower edge ground height h of the battery case 1. _Since it is set to be lower than _2, obstacles can be checked by the mount bracket 12 and the jack-up point bracket 13 as well, so that the road surface interference of the battery case 1 can be more effectively avoided.

Further, since the stabilizer 11 is located at the lowest position among the components of the front suspension unit 8 and is connected to the lower link 10 which is a lower member which can easily secure the installation space, the degree of freedom of layout is increased. Can be increased.

In the above embodiment, the protrusions 11a are formed on both sides of the intermediate portion of the stabilizer 11, but this is between the left and right mount brackets 12, 12 as in the second embodiment shown in FIG. 7, for example. You may make it comprise the whole area | region as the protrusion part 11a.

Further, in each of the above-mentioned embodiments, the stabilizer 1 is used.
Although the intermediate portion of 1 is supported by the mount brackets 12 and 12 on both left and right sides of the first cross member 7, as shown in FIG. 8, one mount bracket 12 is used and the first cross member 7 is supported by the mount bracket 12. Of the first cross member 7 and the stabilizer 11 may be supported by the left and right side portions and the central portion of the first cross member 7 by using three mount brackets 12 as shown in FIG. Good.

As described above, the mount bracket 12 has a rigid structure having the reinforcing bead portion 12a at the center of the outer periphery thereof, so that the mount bracket 12 can be effectively used as a jack-up point bracket.

In each of the above-described embodiments, the case where the intermediate portion of the stabilizer 11 is supported on the lower surface of the first cross member 7 by using the dedicated mount bracket 12 is shown. In addition to this, as shown in FIGS. For example, holder portions 14 may be integrally formed on the back surface of the cross member 7 in left and right side portions in a substantially U-shaped side surface, and the holder portions 14 may hold an intermediate portion of the stabilizer 11 via an insulator rubber 15.

FIG. 12 shows an example in which the present invention is applied to the rear suspension unit 17 arranged on the rear side member 16 behind the battery case 1.

The rear side member 16 is provided with a suspension mount member 20, the lower member 18 of the rear suspension unit 17 is connected to and supported by the suspension mount member 20, and the stabilizer 19 is connected and supported across the left and right lower members 18, 18. is there.

The stabilizer 19 is supported by mount brackets 21 mounted on the rear side surfaces of the left and right suspension mount members 20, and the middle portion of the stabilizer 19 is a protrusion 19a formed by bending downward, and its installation ground height h. ₁ is the ground clearance h _{2 at} the lower edge of the battery case 1.
It is set lower than.

Therefore, according to this embodiment, even if there is an obstacle or the like on the road surface when the vehicle travels backward, the obstacle will hit the middle portion of the stabilizer 19 in advance, so that the driver is not obstructed. Because you can make sure
By immediately stopping the vehicle, it is possible to avoid the battery case 1 from interfering with an obstacle or the like.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a plan view of the first embodiment of the present invention.

FIG. 3 is a front view of the first embodiment of the present invention.

FIG. 4 is an enlarged view of a main part of FIG.

FIG. 5 is a side view of the first embodiment of the present invention.

6 is an enlarged view of a main part of FIG.

FIG. 7 is a front view showing a second embodiment of the present invention.

FIG. 8 is a front view showing a third embodiment of the present invention.

FIG. 9 is a front view showing a fourth embodiment of the present invention.

FIG. 10 is a front view showing a fifth embodiment of the present invention.

FIG. 11 is a sectional view showing a stabilizer supporting portion of a fifth embodiment of the present invention.

FIG. 12 is a front view showing a sixth embodiment of the present invention.

[Explanation of symbols]

1 battery case 2 body floor 3,16 Front-back skeleton member 7 Vehicle width direction frame member 8 Front suspension unit 10,18 Lower member 11,19 Stabilizer 12,21 Mount bracket 13 Jack-up point bracket 17 Rear suspension unit

─────────────────────────────────────────────────── ─── Continued Front Page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60G 21/055 B60K 1/04 B62D 25/20

Claims (9)

(57) [Claims] 1. A battery case is fastened and fixed to a floor skeleton member on the lower side of a vehicle body floor, while a suspension unit is disposed on a pair of left and right front and rear skeleton members at positions offset in the front and rear direction from the battery case, and these suspensions are also provided. A structure for arranging a stabilizer across a unit, wherein a ground height of an intermediate portion of the stabilizer is set lower than a lower edge of a battery case. 2. The underbody structure of the electric vehicle according to claim 1, wherein the stabilizer is a stabilizer for a front suspension arranged in front of the battery case. 3. The underbody structure of the electric vehicle according to claim 1, wherein the stabilizer is a stabilizer for a rear suspension arranged behind the battery case. 4. The stabilizer is configured in such a manner that an intermediate portion thereof extends along a vehicle width direction skeleton member disposed in the vicinity of the suspension unit, and the intermediate portion of the stabilizer is provided through the mount bracket to the vehicle width direction skeleton member. The underbody structure of the electric vehicle according to any one of claims 1 to 3, wherein 5. The underbody structure of the electric vehicle according to claim 4, wherein a plurality of mount brackets are provided. 6. The underbody structure of the electric vehicle according to claim 4, wherein the lower edge of the mount bracket is set at a position lower than the lower edge of the battery case. 7. The underbody structure of the electric vehicle according to claim 4, wherein a jack-up point bracket is provided on a vehicle width direction frame member supporting an intermediate portion of the stabilizer. 8. The underbody structure of the electric vehicle according to claim 7, wherein the lower edge of the jack-up point bracket is set to have substantially the same ground height as the lower edge of the middle portion of the stabilizer. 9. The underbody structure of the electric vehicle according to claim 1, wherein the stabilizer is connected across the lower members of the left and right suspension units.