JPH10138767A - Battery tray fixing structure for electric automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply fix a battery tray to a side frame of an electric automobile. SOLUTION: Welded nuts 10, 10a are welded to a side frame 6 arranged in the lower part of the vehicle body of an electric automobile. A battery tray 4 accommodating therein a battery 2, is formed therein with bolt holes 11, 11a corresponding to the positions of the welded nuts. Of the welded nuts 10, 10a, a nut 10a is tightened thereinto with a positioning stud bolt 13. At first, the stud bolt 13 is inserted into the bolt hole 11a so as to position the battery tray 4, and then, a bolt 12 is tightened into the welded nut 10 so as to secure the battery tray 4 to the side frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a battery tray of an electric vehicle to facilitate positioning of the battery tray when the battery tray of the electric vehicle is fixed to a side frame.

[0002]

2. Description of the Related Art As is well known, an electric vehicle has a large number of batteries mounted thereon unlike an ordinary engine vehicle. FIG.
Shows a state in which the electric vehicle 1 is lifted by the lift 3 in order to attach the battery 2 to the electric vehicle 1. As shown in FIG. 8, the battery 2 includes a battery tray 4
The electric vehicle 1 is moved to the lift 3 by the lifter 3a and fixed to the main frame from the bottom of the vehicle body 1a of the electric vehicle 1. FIG. 9 shows the entire main frame 5. The main frame 5 has a pair of side frames 6 provided along lower left and right portions of the vehicle body, and the battery tray 4 is fixed to the side frames 6.

FIG. 10 shows a method of attaching the battery tray 4 to the side frame 6, and FIG. 11 is an enlarged view showing a part thereof. As shown in the figure, the battery tray 4 is attached with flanges 9 provided on both sides thereof being fixed to a lower portion of the side frame 6. Welding nuts 10 are welded to the inner bottom wall of the side frame 6 at several locations in the front-rear direction of the side frame 6. On the other hand, a bolt hole 11 is formed in the flange 9 of the battery tray 4 at a position corresponding to each welding nut 10. After each welding nut 10 and the bolt hole 11 are aligned, each bolt 12 is fastened to the welding nut 10, and the battery tray 4 is fixed to the side frame 6.

[0004]

As described above, the battery tray is mounted by lifting the electric vehicle with a lift and disposing a lifter on which the battery tray is mounted under the vehicle body. However, it is difficult to align the welding nut fixed to the side frame with the bolt hole formed in the battery tray. For example, even if the shape of the side frame is devised so that the position of the welding nut can be seen from above, the side frame is hidden behind the side panel of the vehicle body and the welding nut cannot be seen. Further, even if the user tries to view the welding nut from below, the lifter becomes an obstacle and the bolt hole of the battery tray cannot be seen.

[0005] Therefore, the positioning work is performed by observing the welding nut of the side frame under the floor of the vehicle body from obliquely below and the bolt hole of the battery tray obliquely from above. I can't confirm that they are aligned. Also, even if the location of the battery tray is correct, the battery tray is distorted by the weight of the battery,
The position of the welding nut and the position of the bolt hole may be shifted.

The present invention has been made in view of the above problems, and provides a battery tray fixing structure for an electric vehicle that can easily position the battery tray when fixing the battery tray of the electric vehicle to the side frame. The purpose is to do.

[0007]

In order to achieve the above object, the present invention provides a pair of side frames extending in the front-rear direction on both sides of a vehicle body and having welding nuts juxtaposed in the longitudinal direction. In a battery tray fixing structure of an electric vehicle including a battery tray provided with a bolt hole in a portion corresponding to the nut of the flange formed on both sides, one end of a stud bolt is screwed to some of the welding nuts, The other end of the stud bolt is inserted into a bolt hole of the battery tray, and the battery tray is fastened with a mounting nut.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a battery tray fixing structure for an electric vehicle according to a first embodiment of the present invention will be described with reference to the drawings. Note that the same components as those in the related art will be described with the same reference numerals. FIG.
Uses the stud bolts 13 for positioning the battery tray 4 and attaches the battery tray 4 to the side frame 6.
It is a method of fixing. That is, as shown in FIG. 2A, of the welding nuts welded to the left and right side frames 6, a stud bolt 13 is screwed to a predetermined portion of the welding nut 10a.
Is fixed.

In this embodiment, since the stud bolt 13 is screwed to the welding nut 10a, the tip of the stud bolt 13 projects downward from the lower part of the side frame 6, as shown in FIG. Therefore, when positioning the battery tray 4, they can be positioned while simultaneously viewing the lower end of the stud bolt 13 and the bolt hole 11a from diagonally above. The position of the stud bolt 13 is
As shown in FIG. 2A, since the battery tray 4 is distributed in the middle of the front part and the rear part, even if the battery tray 4 is distorted by the weight of the battery 2, the bolt holes 11a are inserted through the stud bolts 13. If you do, the distortion will be corrected,
The displacement of the other welding nuts 10 to which the stud bolts 13 are not screwed is reduced, and the bolts 12 can be easily screwed to the welding nuts 10. FIG. 4 shows a state in which the flange 9 of the battery tray 4 is fixed to the side frame 6.

FIGS. 2B and 2C show examples of locations of stud bolts. 2B, a stud bolt is arranged on a welding nut 10a provided at the center of the left and right side frames 6, and a welding nut 10a is also arranged at the center of a cross member 17 connecting the side frames 6. When the battery tray is aligned in this manner, the displacement of the vehicle body in the front-rear and left-right directions is reduced, and it becomes easy to screw the bolt to another welding nut to which the stud bolt is not fixed. . This example is cross member 1
In order to attach the battery tray to the battery tray 7, it is necessary to provide attachment portions at the front and rear portions of the battery tray and form bolt holes. 2C, one stud bolt is arranged on each of the welding nuts 10a of the left and right side frames 6,
The number of positioning locations with stud bolts is reduced.

FIG. 5 shows a modification in which a stud bolt 13 of the same length is screwed to all of the welding nuts 10 to fix the battery tray 4 to the side frame 6. The positioning of the battery tray 4 is performed by the lower end of each stud bolt 13 and the bolt hole 11a of the battery tray 4. If these all match, the position of the battery tray 4 is accurately determined.

FIG. 6 shows another modified example, in which stud bolts are screwed to all the welding nuts 10, but a stud longer than the other stud bolts 13 is provided only at the position where the welding nut 10 b is arranged. The bolt 13a is screwed. The positioning of the battery tray 4 is performed by aligning the lower end of the stud bolt 13a with the bolt hole 11b. Next, the remaining stud bolts 13 are aligned with the bolt holes 11a,
Fine-tune the position of the battery tray 4.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention. For example, in the above embodiment, the stud bolt body
I used one with a stopper to prevent the bolt from getting into it anymore.
You may use the thing without such a stopper. However, in this case, a blind lid is put on the upper part of the welding nut 10 and the stopper is brought into contact with the upper end of the stud bolt to form a stopper.

[0014]

As described above, according to the present invention, the stud bolt is screwed to the welding nut.
The bolt holes on the battery tray can be aligned with the main frame. Therefore, the battery tray can be easily positioned, and the battery tray can be easily fixed. Further, the outer shape of the side frame is almost the same as that of a gasoline-powered vehicle, and a gasoline-powered vehicle and an electric vehicle can be produced on the same line.

[Brief description of the drawings]

FIG. 1 is a side view of a battery tray fixing structure of an electric vehicle according to an embodiment of the present invention.

FIG. 2A is a plan view showing a position where a stud bolt is screwed into a welding nut of the battery tray fixing structure of the electric vehicle according to the embodiment of the present invention. B is a modified example thereof. C is another modified example.

FIG. 3 is a perspective view showing a state in which a stud bolt is screwed into a welding nut of the battery tray fixing structure of the electric vehicle according to the embodiment of the present invention.

FIG. 4 is a front sectional view showing a state in which the battery tray is attached to the side frame by the battery tray fixing structure of the electric vehicle according to the embodiment of the present invention;

FIG. 5 is a side view showing a modified example of the battery tray fixing structure of the electric vehicle according to the embodiment of the present invention.

FIG. 6 is a side view showing another modification of the battery tray fixing structure of the electric vehicle according to the embodiment of the present invention.

FIG. 7 is a side view showing a state where a battery tray is arranged below the electric vehicle.

FIG. 8 is a perspective view showing a battery tray of the electric vehicle.

FIG. 9 is a perspective view showing a main frame of the electric vehicle.

FIG. 10 is a side view of a conventional battery tray fixing structure of an electric vehicle.

FIG. 11 is a perspective view showing a state in which a bolt hole is about to be aligned with a welding nut fixed to a side frame of a battery tray fixing structure of a conventional electric vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric vehicle 2 Battery 4 Battery tray 6 Side frame 9 Flange 10, 10a, 10b Welding nut 11, 11a, 11b Bolt hole 13 Stud bolt 14 Mounting nut

Claims (3)

[Claims] 1. A pair of side frames extending in the front-rear direction on both sides of a vehicle body and having welding nuts juxtaposed in the longitudinal direction thereof, and bolts formed on both sides of the flange corresponding to the nuts. In a battery tray fixing structure for an electric vehicle having a battery tray provided with a hole, one end of a stud bolt is screwed into some of the welding nuts, and the other end of the stud bolt is inserted into a bolt hole of the battery tray. A battery tray fixing structure for an electric vehicle, wherein the battery tray is fastened with a mounting nut. 2. The battery tray fixing structure for an electric vehicle according to claim 1, wherein one end of a stud bolt is screwed to all of the welding nuts. 3. The stud bolt according to claim 1, wherein the thread portion at the other end of the stud bolt has two different lengths.
A battery tray fixing structure for an electric vehicle according to claim 2.