JP2007326388A - Box for control device of electric rolling stock and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure strength of a box and to reduce weight of it concerning the box for a control device of an electric rolling stock arranged on the electric rolling stock and in which control equipment is stored and its manufacturing method. <P>SOLUTION: This box for the control device of the electric rolling stock is arranged on the electric rolling stock, stores the control equipment of the electric rolling stock, has inspection ports to inspect the control equipment on the left and right side surfaces in the travelling direction, comprises a top plate 5 of a top surface, a bottom plate 6 of a bottom surface, each of side plates 7, 8 arranged on fore and aft in the travelling direction of the electric rolling stock and connecting the top plate 5 and the bottom plate 6 and the left and right partition plates 9, 10 partitioning the area between the top plate 5 and the bottom plate 6 into left and right of the travelling direction and connecting the top plate 5, the bottom plate 6 and each of the side plates 7, 8 to each other, and the thickness of each of plates 5 to 10 is determined in consideration of weight of the control equipment and vibration at the travelling of the electric rolling stock. In this constitution the plate thickness of the top plate 5, the bottom plate 6 and each of the side plates 7, 8 is made thinner by 30 to 50% than the thickness of the left and right partition plates 9, 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a box for a control device of an electric vehicle which is arranged on the electric vehicle and accommodates a control device, and a manufacturing method thereof.

  A conventional box for a control device for an electric vehicle is formed into a box shape by fastening a top plate, a bottom plate, and a pair of left and right side plates to each other. In addition, a central partition plate is interposed between the top plate and the bottom plate, and left and right partition plates are interposed between the central partition plate and the pair of left and right side plates so as to increase the overall strength of the box. (For example, refer to Patent Document 1).

JP 2002-120720 A

  In a conventional box for a control device of an electric vehicle, the top plate, the bottom plate, the central partition plate, and the left and right partition plates are configured with the same thickness in order to ensure the vibration strength of the box. In consideration of vibration during running of an electric vehicle, it is possible to suppress bending in the vertical direction (up and down direction) due to the mass of a control device such as a power converter or a transformer housed in a control equipment box. Designed. Therefore, there has been a problem that it is difficult to reduce the weight of the box as an energy saving measure in traveling of an electric vehicle.

  The present invention has been made to solve the above-described problems, and provides a box for a control device for an electric vehicle and a method for manufacturing the same that can ensure the strength of the box and reduce the weight. It is for the purpose.

  The box for an electric vehicle control device according to the present invention is arranged on the electric vehicle to store the electric vehicle control device, and has an inspection port for checking the control device on the left and right sides in the traveling direction. The top plate on the top surface, the bottom plate on the bottom surface, each side plate that is arranged before and after the traveling direction of the electric vehicle and connects the top plate and the bottom plate, and the top plate is divided between the top plate and the bottom plate in the lateral direction of the traveling direction, In a box for a control device of an electric vehicle, comprising a bottom plate and left and right partition plates connected to each side plate, the plate thickness of each plate being determined in consideration of the weight of the control device and vibration during running of the electric vehicle. The plate thickness of the plate, bottom plate and each side plate is 30-50% thinner than the plate thickness of the left and right partition plates.

  According to the present invention, the thickness of the top plate, the bottom plate, and the side plates is made thinner than that of the left and right partition plates, so that the weight of the box can be reduced.

Embodiment 1 FIG.
FIG. 1 is a side view of an electric vehicle on which an electric vehicle control device box is mounted. 2 is a perspective view of a control device box for an electric vehicle according to Embodiment 1 for carrying out the present invention, and FIG. 3 is an exploded perspective view of the control device box of FIG. In the following description, as shown in FIG. 2, the traveling direction of the electric vehicle is the X (front / rear) direction, the vertical direction is the Z (up / down) direction, and the direction perpendicular to the traveling direction and the vertical direction is the Y (left / right) direction. Say.
1 to 3, a power converter, a circuit breaker, a transformer (not shown) and the like for controlling the electric vehicle 1 are stored in the storage chamber 3 of the control device box 2 mounted on the electric vehicle 1. Is done. The box 2 has inspection openings 4 that are opened on the left and right side surfaces of the traveling direction X for inspecting the control device, and is arranged on the top plate 5 on the upper surface having the work holes 5a, the bottom plate 6 on the lower surface, and front and rear in the traveling direction. Opened are the side plates 7 and 8 that connect the top plate 5 and the bottom plate 6, the top plate 5 that separates the left and right of the traveling direction between the top plate 5 and the bottom plate 6, the bottom plate 6, and the side plates 7 and 8. The left and right partition plates 9 having 9 a are connected by the left and right partition plates 10. A front and rear partition plate 11 is disposed on the YZ plane between the top plate 5 and the bottom plate 6 and joined to the top plate 5 and the bottom plate 6. A cover 12 is provided in the work hole 5 a of the top plate 5. An inspection cover 13 is attached to each inspection port 4. The box 2 is attached under the floor of the electric vehicle 1 via the mounting seat 14. The top plate 5, the bottom plate 6, the side plates 7, 8 and the front and rear partition plates 11 are 30 to 50% thinner than the left and right partition plates 9 and 10.
As shown in FIG. 1, the box 2 configured in this manner is fixed to the lower floor of the electric vehicle 1 with a bolt (not shown) via a mounting seat 14.
As shown by the arrow in FIG. 2, the box 2 is subjected to a load due to acceleration in the traveling direction X during acceleration and deceleration during operation of the electric vehicle 1. Also, the curve receives a load in the Y direction due to centrifugal force. Furthermore, it receives a gravity load in the vertical direction Z.

It is difficult to solve such deformation due to loads in the X, Y, and Z directions analytically with closed equations, and because verification by a prototype is a large device, labor is required, so numerical analysis by the finite element method The examination by was carried out. As a calculation program of the finite element method, linear deformation analysis was performed using I-DEAS of SDRC Inc., which is famous in this field.
The dimensions of the box 1 are the length in the traveling direction X (front and back) x = 2000 mm, the length in the direction Y (left and right) perpendicular to the traveling direction and the vertical direction y = 1800 mm, and the length in the vertical direction Z (up and down). A numerical analysis model in which a power converter (mass 20 kg), a breaker (mass 5 kg), a transformer (mass 30 kg), etc. are arranged in the storage chamber 3 is set to z = 600 mm. The analysis was performed in consideration.
The top plate 5, the bottom plate 6, the side plates 7 and 8, the left and right partition plates 9 and the front and rear partition plates 11 constituting the box body 2 are all SS400 steel plates having a thickness of 4.5 mm as basic specifications. The thickness of the top plate 5, the bottom plate 6, the side plates 7, 8, and the left and right partition plates 9 constituting the box body 2 is considered in consideration of the weight of the control device housed in the box body 2 and the vibration when the electric vehicle 1 travels. The specifications were determined as basic specifications. Regarding the analysis of deformation, the cover 12 and the inspection cover 12 are not members that are firmly fixed and coupled, so that they are considered to have little influence as strength members, and the analysis was performed by excluding them from the model.

First, as a first load condition, it is assumed that a self-weight load acts in each of the X, Y, and Z directions, and X, Y, and Z are applied to all components of the box 2 as indicated by arrows in FIG. The amount of deformation and the deformation mode were analyzed by applying an acceleration of 9.8 m / s ^{2 in} each direction. As for the fixing condition, the mounting hole 14a of the mounting seat 14 was constrained on the assumption that the box 2 was suspended by being bolted to the electric vehicle 1 through the mounting hole 14a of the mounting seat 14.
FIG. 4 shows the deformation mode obtained from the analysis result. A broken line indicates the deformation before the load, and a solid line indicates the deformation at the time of the load. When the acceleration of the arrow acts in the X direction as a deformation mode of the box 2 of the electric vehicle 1, the deformation mode is a shear (parallelogram) as viewed from the Y direction (FIG. 4A). When the acceleration of the arrow acts in the Y direction, the deformation mode is a shear (parallelogram) when viewed from the X direction (FIG. 4B). When acceleration acts in the direction of the arrow in the Z direction, the top plate 5 and the bottom plate 6 of the box are in a mode of bending in a U shape with the position of the mounting seat 14 as a node when viewed from the Y direction (FIG. 4). (C)).
Further, FIG. 4 shows a non-dimensional deformation amount at the maximum displacement location. The dimensionless deformation amount is obtained by dividing the maximum displacement amount in each load mode by the maximum displacement amount in the vertical direction (Z direction) load, thereby making it dimensionless. When the dimensionless maximum deformation amounts in the load directions of X, Y, and Z are represented by δx, δy, and δz, respectively, δx = 1.17 and δy = 1.00, respectively, assuming that δz = 1 from the definition of dimensionlessness. The deformation amount δx in the X direction was found to be nearly 20% larger than the displacement δz in the vertical direction and the displacement δy in the Y direction.
Next, as a second load condition, the deformation due to dynamic vibration was also analyzed. The same finite element model as described above was used, and natural vibration mode analysis was performed in the frequency range of 5 Hz to 150 Hz by the calculation program I-DEAS. The effective mass ratio is used as an influence evaluation index of the obtained natural vibration mode. Effective mass is an important index for knowing the contribution rate to the response value of each vibration mode, and indicates how much of the total mass of the structure contributes to deformation of each vibration mode. It is. The ratio of the effective mass of each vibration mode to the total mass is called the effective mass ratio (the maximum value is 1.0). Therefore, the larger the effective mass ratio, the greater the vibration response.

The relationship between the natural frequency (resonance frequency) and the effective mass ratio is as shown in FIG. The symbol mark ◯ in FIG. 5A indicates the effective mass ratio in the X direction, the square in FIG. 5B indicates the Y direction, and the X in FIG. 5C indicates the effective mass ratio in the Z direction. The effective mass ratio protrudes with the maximum vibration mode in the X direction near the natural vibration frequency of 50 Hz, and this deformation mode is sheared (parallelogram) when viewed from the Y direction shown in FIG. It has become. The dominant vibration modes in the X, Y, and Z directions in the natural vibration mode are the same as the deformation mode by static acceleration shown in FIG.
From the analysis results under the static and dynamic load conditions described above, the box body 2 that is bolted and suspended under the floor of the electric vehicle 1 via the mounting seat 14 is from the Y direction when a load acts in the X direction. It can be seen that the shear deformation seen (FIG. 4A) is the largest. The reason is that the box 2 of the electric vehicle 1 is fixed in a suspended state below the floor of the electric vehicle 1 with a mounting seat 14, and the side of the box 2 with respect to the traveling direction X is large. Since the inspection port 4 of the opening is provided, the structure is weak, especially when a load acts in the traveling direction (X direction), the side plates 7 and 8 connected to the bottom plate 6 on which the built-in equipment is placed, and the front and rear This is because the partition plate 11 has a structure that is easy to rotate (shear deformation) with the mounting seat 14 as a fulcrum when viewed from the Y direction.
From the above viewpoint, it is apparent that increasing the shear rigidity of the left and right partition plates 9 and 10 is effective in increasing the rigidity of the box 2 of the electric vehicle 1. In other words, it is possible to reduce the rigidity of the constituent members other than the left and right partition plates 9 and 10 that have little contribution to the deformation mode.
In order to confirm this, in this example, the analysis was performed using the plate thickness of the constituent member as a parameter. Table 1 shows the relationship between the maximum effective mass ratios in the X, Y, and Z directions when the main structural members of the box 2 of the electric vehicle 1 are combined with various plate thicknesses.

In Table 1, specifications 1, 2 and 3 are examples in which only the thickness of the left and right partition plates 9 and 10 is maximized. In any combination of the plate thicknesses of the constituent members shown in the specifications 1 to 3, the maximum effective mass ratio is 3 to 5 times larger due to the vibration in the X direction than in the Y direction or the Z direction. In the specifications 1 to 3, all the thicknesses other than the left and right partition plates 9 and 10 are reduced from 3.2 mm to 2.3 mm with respect to 4.5 mm of the basic specification. However, the maximum effective mass ratio in the X direction in the specifications 1 to 3 is a value within 5% of the basic specifications and is not inferior to the basic specifications. Furthermore, as shown in the specification 3, when the plate thicknesses of the left and right partition plates 9 and 10 and each component are made thinner than those of the specification 1 and the specification 2, the same maximum effective mass ratio is obtained. Furthermore, in the specification 3, the maximum effective mass in the Z direction is rather small, so that the overall mass of the box 2 is reduced, which is advantageous for vibration deformation. From this, the configuration in which only the left and right partition plates 9 and 10 in the specification 3 of this embodiment are thickened to 3.2 mm ensures the shear shear stiffness of the left and right partition plates 9 and 10 so that X excitation shear stiffness is ensured. It is successful.
On the other hand, in the case of the specification 4 in which the thickness of all the components including the left and right partition plates 9 and 10 is 2.3 mm, the maximum effective mass in the X direction is 0.67, which is larger than the maximum effective mass of the basic specification. Increased by more than 10%. Moreover, in the specification 4, when the required safety factor was considered, the site | part beyond the tensile strength of material generate | occur | produced the stress generated by the static load of a X direction.
As described above, in this embodiment, the box 2 is manufactured by selecting and combining the constituent members so that the stress due to the static load acting on the box 2 is less than the tensile stress of the material in consideration of the required safety factor. In this case, even if the thickness of the top plate 5, the bottom plate 6 and the side plates 7 and 8 is 30 to 50% thinner than the thicknesses of the left and right partition plates 9 and 10, X is assumed when the electric vehicle 1 travels. The static and dynamic shear deformation as seen from the Y direction of the box body 2 due to the load in the direction has the same rigidity as when all the constituent members are configured with the same plate thickness. Further, the total mass of the box body 2 while having equivalent shear rigidity can be reduced by 20% to 40% as shown in Table 1, so that there is an effect that it can be manufactured at low cost.
Further, the maximum effective mass ratio when the ratio of the total mass of the box 2 and the mass contributing to the deformation in the traveling direction of the left and right partition plates 9 and 10 to the vibration mode in the traveling direction is the effective mass ratio is The top plate 5, the bottom plate 6, and the side plates so that the maximum effective mass ratio is within 5% when the plate 5, the bottom plate 6, the side plates 7 and 8, and the left and right partition plates 9 and 10 are configured with the same plate thickness. By making the plate thicknesses 7 and 8 thinner than those of the left and right partition plates 9 and 10, the weight of the box 2 can be reduced.
In Embodiment 1, the case where the material of the structural member of the box 2 is SS400 steel and the box 2 is manufactured by arc welding has been described. For example, the material of the structural member is aluminum alloy, Even when a bent flange and a rivet joint hole are provided at the end of a component member to form a rivet fastening structure, the plate thickness of the left and right partition plates 9 and 10 is made thicker than the other component members. The same effect can be expected.
Furthermore, in Embodiment 1, although what provided the front-and-back partition plate 11 was demonstrated, since the front-and-back partition plate 11 does not contribute to vibration deformation, it does not need to be strong.

Embodiment 2. FIG.
FIG. 6 is an exploded perspective view of a control device box for an electric vehicle according to Embodiment 2 for carrying out the present invention. In FIG. 6, 5 to 8 and 11 to 14 are the same as those in the first embodiment.
The box body 15 is arranged on the top plate 5, the bottom plate 6, and the side plates 7 and 8 which are arranged before and after the traveling direction to connect the top plate 5 and the bottom plate 6, and between the top plate 5 and the bottom plate 6 on the left and right in the traveling direction. The top plate 5, the bottom plate 6, and the side plates 7 and 8 are connected by left and right partition plates 16 and 17 so as to partition. The left and right partition plates 16 and the left and right partition plates 17 having openings 16b arranged on the X-Z plane are bent at both ends in the X direction (traveling direction) so that the cross section in the vertical direction Z becomes a U-shape. Edge folds 16a and 17a are formed. Thus, by making the cross section U-shaped, the box 2 can reduce the shear deformation seen from the Y direction against the load condition in the X direction as described in the first embodiment.
The box 15 has the same dimensions as in the first embodiment, and the top plate 5, the bottom plate 6, the side plates 7 and 8, the front and rear partition plates 11 and the left and right partition plates 15 and 16 are made of SS400 steel with a thickness of 2.3 mm. .
As in the first embodiment, linear deformation analysis was performed using I-DEAS of SDRC, Inc., as the finite element method calculation program. As a result, since the edge folds 16a and 17a having a width of 100 mm and a height of 50 mm are provided at both ends of the left and right partition plates 16 and 17 having a plate thickness of 2.3 mm, the maximum effective mass ratio is 0.62. The generated stress was not exceeding the tensile strength of the material even considering the required safety factor. Further, the mass of the box 15 is lighter than the specification 3 of the first embodiment because the thickness of the left and right partition plates 16 and 17 can be 2.3 mm (0. 53).

In the second embodiment, the edge folds 16a and 17a of the left and right partition plates 16 and 17 are formed by bending the end portions of the partition plates 16 and 17 integrally. You may integrate with the edge part of the partition plates 16 and 17. FIG.
In the second embodiment, the edge folds 16a and 17a of the left and right partition plates 16 and 17 have been described as being provided at end portions in the front-rear direction of the left and right partition plates 16 and 17. It may also be added to the (top plate side and bottom plate side). Furthermore, edge folding provided in the front and rear and left and right may be connected at the corners of the left and right partition plates 16 and 17 to form a U-shaped edge fold around the left and right partition plates 16 and 17.
Further, in the second embodiment, the case where the material of the component of the box 15 is SS400 steel and the box 15 is manufactured by arc welding has been described. For example, the material of the component is aluminum alloy, instead of arc welding. Even in the case of providing a rivet fastening structure by providing a bent flange and a rivet joint hole at the end of each component member, both the front and rear ends of the left and right partition plates 16 and 17 have a U-shaped cross section in the vertical direction Z. The same effect can be expected even if the edge folds 16a and 17a formed by bending are formed.

Embodiment 3 FIG.
FIG. 7 is an exploded perspective view of a control device box for an electric vehicle according to Embodiment 3 for carrying out the present invention. In FIG. 7, reference numerals 5 to 8 and 11 to 14 are the same as those in the first embodiment.
The box 18 is arranged on the top plate 5, the bottom plate 6, front and rear in the traveling direction, and the side plates 7 and 8 that connect the top plate 5 and the bottom plate 6, and the left and right in the traveling direction between the top plate 5 and the bottom plate 6. The top plate 5, the bottom plate 6, and the side plates 7 and 8 are connected by a left and right partition plate 19 and a left and right partition plate 20 having an opening 19 c so as to partition. The left and right partition plates 19 and 20 have U-shapes at the top and bottom and front and back to form edge folds 19a, 19b, 20a, and 20b. The four corners have a width in the X direction and are approximately 45 degrees with respect to the vertical Z direction. Inclined bridging plates 21 and 22 are provided. The bridge plates 21 and 22 bridge the top plate 5 and the side plates 7 and 8, the top plate 5 and the front and rear partition plates 11, the bottom plate 6 and the side plates 7 and 8, and the bottom plate 6 and the front and rear partition plates 11.
By providing the bridging plates 21 and 22 in this way, the box 18 can reduce the shear deformation seen from the Y direction with respect to the load condition in the X direction (traveling direction).
The box 18 has the same dimensions as in the first embodiment, and the top plate 5, the bottom plate 6, the side plates 7 and 8, the front and rear partition plates 11 and the left and right partition plates 19 and 20 are made of SS400 steel with a thickness of 2.3 mm. .

As in the first embodiment, linear deformation analysis was performed using I-DEAS of SDRC, Inc., as the finite element method calculation program.
Since the bridge plates 21 and 22 are provided at the four corners of the left and right partition plates 19 and 20 having a plate thickness of 2.3 mm, the maximum effective mass ratio is 0.61, which is the same as the basic specifications in Table 1, and the generated stress is the required safety. The tensile strength of the material was not exceeded even considering the rate. Furthermore, the mass of the box 18 is lighter than the specification 3 of the first embodiment because the plate thickness of the left and right partition plates 21 and 22 can be 2.3 mm (0. 54).
In the third embodiment, the case where the material of the structural member of the box 18 is SS400 steel and the box 18 is manufactured by arc welding has been described. For example, the material of the structural member is aluminum alloy, The same effect can be expected by providing the bridging plates 21 and 22 at the four corners of the left and right partition plates 21 and 22 even when the ends of the component members are bent and the flange and the rivet joint hole are provided to form a rivet fastening structure. I can do it.

Embodiment 4 FIG.
FIG. 8 is an exploded perspective view of a box for a control device for an electric vehicle according to Embodiment 3 for carrying out the present invention. In FIG. 8, 5 to 8 and 11 to 14 are the same as those in the first embodiment.
The box body 23 is arranged on the top plate 5, the bottom plate 6, front and rear in the traveling direction, and the side plates 7 and 8 that connect the top plate 5 and the bottom plate 6, and the left and right in the traveling direction between the top plate 5 and the bottom plate 6. The top plate 5, the bottom plate 6, and the side plates 7 and 8 are connected by left and right partition plates 24 and 25 arranged on the XZ plane so as to partition. The left and right partition plates 24 have a structure in which an opening 24a for electrically connecting the control devices stored in the box 23 is provided. On the XZ plane of the left and right partition plates 24 and 25, bracings 26 and 27 having a plate thickness of 3.2 mm and a width of 100 mm are joined diagonally. The bracing 26 has a U-shaped cross section and an L-shaped cross section, but may be unified to any shape.
The box body 23 had the same dimensions as in the first embodiment, and the top plate 5, the bottom plate 6, the side plates 7 and 8, and the front and rear partition plates 11 were made of SS400 steel with a thickness of 2.3 mm. The left and right partition plates 24 and the left and right partition plates 25 having the openings 24a were made of SS400 steel with a plate thickness of 3.2 mm in order to ensure strength.
As in the first embodiment, linear deformation analysis was performed using I-DEAS of SDRC, Inc., as the finite element method calculation program.
As a result, the maximum effective mass ratio was 0.62, which was equivalent to the basic specifications in Table 1, and did not exceed the static yield strength.
By providing the braces 26 and 27 in this way, the box body 23 can reduce the shear deformation seen from the Y direction with respect to the load condition in the X direction (traveling direction).
In Embodiment 4, although the case where the material of the structural member of the box body 23 is SS400 steel and the box body 23 is manufactured by electric arc welding has been described, for example, the material of the structural member is an aluminum alloy and each of them is replaced by electric arc welding. The same effect can be expected by providing bracings 26 and 27 in the left and right partition plates 24 and 25 even when the ends of the component members are bent to provide a rivet fastening structure with a flange and a rivet joint hole.

It is a side view of the electric vehicle carrying the box for control devices of an electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a control device box for an electric vehicle according to Embodiment 1 for carrying out the present invention. It is the perspective view which decomposed | disassembled the box of FIG. It is explanatory drawing which shows the deformation | transformation mode of the box of FIG. It is explanatory drawing which shows the relationship between the strong motion frequency and effective mass ratio of the box of FIG. It is the perspective view which decomposed | disassembled the box for electric vehicle control apparatuses in Embodiment 2 for implementing this invention. It is the perspective view which decomposed | disassembled the box for control apparatuses of the electric vehicle in Embodiment 3 for implementing this invention. It is the perspective view which decomposed | disassembled the box for control apparatuses of the electric vehicle in Embodiment 3 for implementing this invention.

Explanation of symbols

1 Electric car, 2, 15, 18, 23 Box, 4 Inspection port, 5 Top plate, 6 Bottom plate,
7, 8 side plate, 9, 10, 16, 17, 19, 20, 24, 25 left and right partition plates,
16a, 17a, 19a, 19b, 20a, 20b Folding, 26, 27 Braces.

Claims (5)

  The control device for the electric vehicle is housed on the electric car, and has inspection ports on the left and right side surfaces in the traveling direction of the electric vehicle for checking the control device. Bottom plate, each side plate arranged before and after the traveling direction and connecting the top plate and the bottom plate, partitioning the top plate and the bottom plate left and right in the traveling direction and the top plate, the bottom plate, And a left and right partition plate connected to each side plate, and the thickness of each plate is determined in consideration of the weight of the control device and vibration during travel of the electric vehicle. A box for a control device for an electric vehicle, characterized in that the top plate, the bottom plate, and the side plates have thicknesses 30 to 50% thinner than those of the left and right partition plates.   The box for an electric vehicle control device according to claim 1, wherein the front and rear end portions of the left and right partition plates in the traveling direction are bent along a vertical direction. .   The box for a control device for an electric vehicle according to claim 1, wherein the upper and lower ends of the left and right partition plates and the front and rear end portions in the traveling direction are formed in a U-shape to form an edge fold, and the four corners of the edge fold are formed. A box for a control device of an electric vehicle characterized by being joined.   The box for a control device for an electric vehicle according to claim 1, wherein a bracing is provided on a diagonal line of the surface of the left and right partition plates.   Arranged on the electric vehicle, the electric vehicle control device is accommodated, and there are openings for checking the control device on the left and right side surfaces in the traveling direction of the electric vehicle. Bottom plate, each side plate arranged before and after the traveling direction and connecting the top plate and the bottom plate, partitioning the top plate and the bottom plate left and right in the traveling direction and the top plate, the bottom plate, And a left and right partition plate connected to each side plate, and the thickness of each plate is determined in consideration of the weight of the control device and the vibration during running of the electric vehicle. In the manufacturing method, the maximum effective mass ratio when the ratio between the total mass of the box and the mass contributing to the deformation in the traveling direction of the left and right partition plates with respect to the vibration mode in the traveling direction is an effective mass ratio. The top plate, the bottom plate, the side plates, and the left and right partition plates. The plate thickness of the top plate, the bottom plate, and the side plates is made thinner than the plate thickness of the left and right partition plates so that the maximum effective mass ratio is less than 5% when configured with the same plate thickness. Of manufacturing a box for a control device of an electric vehicle.

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