JP2001095101A - Power converter housing device and assembly thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a power converter housing device by making outfitting electric wires 4 directly connectable to a connecting section 8 formed in a long box. SOLUTION: A power converter housing device which houses a power converter attached to the lower surface of the floor of a vehicle 7 is formed in such a way that the size of the box frame 1 of the housing device in the direction of ties is adjusted, so that another device may be attached to the lower surface of the floor on the other side in the direction of ties when the device is attached to one side of the lower surface from the center of the vehicle 7 in the transversal direction. The entrance section of outfitting electric wires 4 which electrically connect the vehicle 7 side to a main power circuit converting unit 2 side housed in the housing device is provided at the end section of the housing device in the direction of rails, and an electric wire duct section 13 is formed as part of the housing device in the upper part of the housing device on the center side of the vehicle body. Therefore, the electric wire duct which is installed on the vehicle body side in the conventional example is constituted as part on the power converter side and the electric wires 4 are wired straight from the housing device to a motor for driving the vehicle 7. Therefore, the electric wire duct on the vehicle body side is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power converter housing device for a vehicle power converter and a power converter housing device assembly.

[0002]

2. Description of the Related Art Conventionally, the structure of a power conversion device accommodating device for a vehicle power conversion device is shown in FIG.
And FIG. The hook wire 4 is relayed by a hook wire relay terminal block 8 in the box. The connection from the terminal block 8 for relaying the electric wire to the terminal block 3 of the main circuit conversion unit 2 is performed in a box by a main circuit conductor (or a main circuit wire; the same applies hereinafter).
9 for connection. The cable 4 is fixed by an electric wire cleat 10 on the back of the device, and is led to an electric wire duct 12 provided on an underframe 7 on the vehicle body side. At this time, the electric wire duct 1 on the power conversion device housing device side and the vehicle body side
Between them, an intermediate wire duct 11 is often provided in order to prevent the wire 4 from being exposed.

In recent years, as shown in FIG. 17, there are many systems in which the terminal block 8 for relaying the wire is omitted and the wire 4 is directly connected to the terminal block 3 of the main circuit conversion unit 2. It has become to.

[0004] On the other hand, the structure of a conventional power conversion device accommodating device having an integrated box structure is as shown in FIG. In the case of a one-piece box, unlike the longitudinal box, the direction in which the wire 4 is pulled out is the rail direction of the device, and there is an advantage that the wire duct provided on the vehicle manufacturer side is simplified. However,
On the power conversion device housing device side, the terminal block 8
Are provided at both ends in the rail direction of the device, and the main circuit conductors 9 are used between the wire connection terminal block 8 and the main circuit conversion unit 2 in the same manner as in the case of the conventional longitudinal box configuration. I have.

[0005]

However, the structure of such a conventional power conversion device accommodating device has the following problems. That is, in the conventional longitudinal box configuration shown in FIGS. 15 and 16, the wire 4 is connected between the power conversion device housing device side and the wire cable duct 12 provided on the vehicle body side.
May be exposed, which is liable to be affected by noise, and may cause disturbance to the signal system, which is not preferable. In addition, in order to prevent the exposed wire 4 from being exposed, FIG.
As shown in FIG. 6, an electric wire duct 11 may be separately provided between the power conversion device accommodating device and the vehicle body-side cable electric wire duct 12, but this has a problem that the configuration becomes complicated.

Further, in the conventional one-box structure shown in FIG. 18, the power conversion device accommodating device mainly includes a terminal block 8 for relaying electric wires at both ends in the rail direction and a terminal block 3 of the main circuit conversion unit 2. Since it is configured using the circuit conductor 9,
As compared with the longitudinal box configuration, there is a problem that the number of parts and the size are inevitably increased, and the configuration is complicated. In addition, the arrangement of the transmission line relay terminal block 8 is usually different in the arrangement of the underfloor equipment and the arrangement of the electric motor depending on the type of vehicle. In such a case, the route of the main circuit conductor 9 is reviewed for each type of vehicle and measures are taken. Therefore, there is also a problem that various types are obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and a power conversion apparatus accommodating apparatus capable of simplifying the structure by directly connecting a wire to a connection portion having a longitudinal box configuration. The purpose is to provide.

According to the present invention, a power converter housing device having a conventional integral box structure can be constructed by using the above-described power converter housing device having a longitudinal box structure. An object of the present invention is to provide a power converter housing assembly that can be directly connected to simplify the structure.

[0009]

According to the first aspect of the present invention, there is provided a power conversion device housing device for housing a power conversion device mounted under a floor of a vehicle, wherein a size of the device box frame in a sleeper direction is defined as:
By mounting the device on one side from the center of the vehicle width, it is possible to mount another device at the position on the opposite side of the sleeper, and the end of the device in the rail direction accommodates the vehicle body and itself. In this case, an entrance portion of a cable wire for electrically connecting to a main circuit conversion unit side is provided, and an electric wire duct portion is formed as a part of the device at an upper portion on the vehicle body center side of the device.

In the power conversion device accommodating device according to the first aspect of the present invention, the electric wire duct conventionally installed on the vehicle body side is configured as a part of the power conversion device side, and the wire is substantially straightened from the device. The structure is directed to the motor for driving the vehicle, and the electric wire duct on the vehicle body side is simplified.

According to a second aspect of the present invention, in the power conversion device accommodating device of the first aspect, the main circuit conversion unit includes a plurality of main circuit conversion units and is disposed at both ends in the rail direction of the device.
A control unit is arranged in the middle of the main circuit conversion units at the both ends, so that the main circuit wiring and the low-voltage control circuit wiring in the device can be easily separated, and the noise resistance is enhanced.

According to a third aspect of the present invention, in the power conversion device accommodating device according to the first or second aspect, the electric wire duct portion and the main circuit conversion unit can be detachably attached to the center side in the vehicle width direction so as to be inspected together. With a simple inspection cover,
In the past, the wire duct cover and the inspection cover that opened and closed when inspecting the storage parts were separated, but the integration has reduced the number of covers and the number of parts for cover fixing brackets. In addition, since the cover is integrally formed, the seam between the cover and the box frame side is reduced, and the shielding effect against direct noise to the ground side is large.

According to a fourth aspect of the present invention, in the power conversion apparatus accommodating apparatus according to any one of the first to third aspects, the connection wire enters the device through a connection portion of the connection wire on the end face in the rail direction, and the main circuit conversion unit And the terminal block for relaying electric wires inside the device can be omitted.

According to a fifth aspect of the present invention, there is provided a power conversion device housing device assembly according to any one of the first to fourth aspects, wherein the two power conversion device housing devices are oriented opposite to each other on both sides in the direction of the crossties under the floor of the vehicle. And the electric wire duct portions of the two devices are connected to each other to be integrated.

According to a fifth aspect of the present invention, in the power converter housing assembly, two of the power converter housings according to any one of the first to fourth aspects are arranged opposite to each other on both sides in the direction of the sleeper under the floor of the vehicle. However, by connecting the wire ducts of both devices and integrating them, compared to the conventional one-box configuration, there is more inspection space in the center of the vehicle body, improving the workability of maintenance and inspection, and Work outside of the office.
In addition, each of the power conversion device accommodating devices constituting the assembly can be manufactured individually, and handling, transportation, etc. in the manufacturing operation can be performed in a divided state. It is more advantageous.

According to a sixth aspect of the present invention, in the power converter housing assembly of the fifth aspect, each of the main circuit conversion units located on both sides in the sleeper direction is connected to one of both ends in the rail direction. The main circuit conversion unit portion and the control unit portion of both power converters are arranged separately in the rail direction, so that the high-voltage circuit portion and the low-voltage circuit portion are separated in terms of arrangement. And noise resistance is improved.

According to a seventh aspect of the present invention, in the power converter housing assembly of the sixth aspect, a single inspection cover is provided so as to extend over both of the connecting portions of the electric wire ducts. The number of inspection covers and the number of parts can be further reduced, and the number of joints with the box frame can be further reduced to further enhance the shielding effect against direct noise.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 and FIG. 2 show the structure of the power converter housing device according to the first embodiment of the present invention. The first embodiment corresponds to the power converter housing device having the longitudinal box configuration shown in FIGS. 15 and 16. FIG.
2 and FIG. 2, the same elements as those in the conventional example are denoted by the same reference numerals.

In the power converter housing device according to the first embodiment, the outer dimensions of the box frame 1 in the sleeper direction are biased to one side from the center of the vehicle width, so that the position on the opposite side in the sleeper direction is provided. And a wire frame 4 for electrically connecting the vehicle body 7 side and the main circuit conversion unit 2 side housed therein to the both ends of the box frame 1 in the rail direction. An inlet portion is provided, and an electric wire duct portion 13 is integrally formed as a part of the box frame 1 at an upper portion of the box frame 1 on the center side of the vehicle body.

A terminal block 8 for relaying the wire is installed at each entrance of the wire 4, and the wire 4 taken into the apparatus from the end in the rail direction is passed through these terminal blocks 8. It is connected to the main circuit conductor 9. This relay terminal block 8
The other end of the main circuit conductor 9 connected to one end is connected to the terminal block 3 of the main circuit conversion unit 2.

The electric wire duct portion 13 is provided with a bottom cover 5, and the rear cover 6 is provided on the back surface of the box frame 1, that is, on the side surface on the center side of the vehicle body. The connection work and the inspection work of the feeder wire 4 to the main circuit conversion unit 2 are performed, and the maintenance and inspection work of the main circuit conversion unit 2 is performed.

As a result, in the power conversion device accommodating device of the first embodiment, the wire 4 can be taken in from the rail direction, and the wire duct conventionally provided by the vehicle manufacturer can be simplified. Since an intermediate electric wire duct between the side and the device is not required, the exposure of the cable wire can be prevented, so that the shielding effect against direct noise to the signal sensor on the ground side is high. Further, the structure of the underfloor structure on the vehicle body side can be simplified.

Next, a power converter housing assembly according to a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, two units A and Aa of the power converter housing device according to the first embodiment shown in FIGS. 1 and 2 are arranged on both sides in the sleeper direction under the floor of the vehicle 7 in opposite directions. Then, the wire duct portions 13 and 13a of both devices A and Aa are connected and integrated.

In FIGS. 3 and 4, the same components as those in the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the same power conversion device accommodating device. In order to identify which of A and Aa the element belongs to, one code is indicated by adding a as a subscript.

The power converter housing assembly according to the second embodiment corresponds to the conventional power converter housing of the integrated box configuration shown in FIG. However, in the case of the present embodiment, the two units A and Aa of the power conversion device accommodating device having the longitudinal box configuration of the first embodiment are provided side by side, and the electric wire duct unit 1 is provided.
3, 13a are connected to each other to form an integrated box, so that it is not necessary to separately manufacture the elongated box and the integrated box in manufacturing.
It is sufficient to manufacture only a long box structure and combine the two members as needed to form an integrated box structure, thereby reducing the number of types of manufacture and reducing costs.

Next, a power converter assembly according to a third embodiment of the present invention will be described with reference to FIGS. The feature of the third embodiment is that the power conversion device accommodating device A of the first embodiment shown in FIGS. 1 and 2 and the power conversion device accommodating device Ab having a mirror-symmetrical structure with the power conversion device accommodating device Ab. To
As in the second embodiment, they are arranged opposite to each other on both sides in the sleeper direction under the floor of the vehicle 7 and the electric wire duct portions 13 and 13b of both devices A and Ab are connected and integrated. .

In FIGS. 5 and 6, the same elements as those in the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the power conversion device accommodating devices A, In order to identify which element belongs to Ab, one of the reference numerals is indicated by adding b as a subscript.

The power converter housing assembly according to the third embodiment corresponds to the conventional power converter housing of the integral box configuration shown in FIG. However, in the case of the present embodiment, the two units A and Ab of the power conversion device accommodating device having the longitudinal box configuration of the first embodiment are provided side by side, and the electric wire duct unit 1 is provided.
Since it is possible to form one integrated box by connecting and integrating the 3, 13b with each other, it is not necessary to separately manufacture the one having the longitudinal box configuration and the one having the integrated box configuration in manufacturing,
It is sufficient to manufacture only a long box structure and combine the two members as needed to form an integrated box structure, thereby reducing the number of types of manufacture and reducing costs.

However, in the case of the third embodiment, instead of using two power conversion device accommodating devices having the same longitudinal box configuration as in the second embodiment, mirror-symmetric arrangement is used. Since the power converter storage devices A and Ab are integrated,
Although the manufacturing process is more complicated than that of the second embodiment, since the component materials used are common, the manufacturing process is more complicated than in the case where the long box structure and the one-box structure are conventionally manufactured. Simplification can be achieved.

In addition, in the power converter housing assembly according to the third embodiment, the high-voltage main circuit conversion unit is biased toward one of the front and rear sides in the rail direction on both sides from the center in the width direction of the vehicle body. 2, 2b and the low-voltage control units 14, 14b are biased to the other side in the rail direction, so that the high-voltage side and the low-voltage side are easily separated, and there is an advantage that noise resistance is improved.

Next, a power conversion apparatus accommodating apparatus according to a fourth embodiment of the present invention will be described with reference to FIGS.
The power conversion device accommodating device of the fourth embodiment is different from the device of the first embodiment shown in FIGS.
The main circuit conversion units 2 and 2 are spaced apart from each other at both ends in the rail direction, and the control unit 14 is located at the center in the rail direction.
Are arranged. Other configurations are common to the first embodiment.

In the fourth embodiment, the main circuit wiring and the low-voltage control circuit wiring in the device can be easily separated, and the noise resistance can be improved.

Next, a power converter housing assembly according to a fifth embodiment of the present invention will be described with reference to FIGS. 9 and 10. FIG. The fifth embodiment is a modification of the power conversion device accommodating device according to the fourth embodiment shown in FIGS.
Aa is disposed on both sides in the direction of the sleeper under the floor of the vehicle 7 in opposite directions, and the electric wire duct portions 13 and 13a of both devices A and Aa are arranged.
They are connected to each other and integrated.

9 and 10, the same elements as those in the fourth embodiment shown in FIGS. 7 and 8 are denoted by the same reference numerals, and the same power conversion apparatus accommodating apparatus. In order to identify which of A and Aa the element belongs to, one code is indicated by adding a as a subscript.

The power converter housing assembly according to the fifth embodiment corresponds to the conventional power converter housing of the integrated box configuration shown in FIG. However, in the case of the present embodiment, the two units A and Aa of the power conversion device housing device having the longitudinal box configuration of the fourth embodiment are arranged side by side, and
3, 13a are connected to each other to form an integrated box, so that it is not necessary to separately manufacture the elongated box and the integrated box in manufacturing.
It is sufficient to manufacture only a long box structure and combine the two members as needed to form an integrated box structure, thereby reducing the number of types of manufacture and reducing costs.

Next, a power converter accommodating apparatus according to a sixth embodiment of the present invention will be described with reference to FIG. The sixth embodiment is different from the first embodiment in that the bottom cover 5 of the electric wire duct 13 and the rear cover 6 on the back of the box frame are integrated into one inspection cover 15. And

As a result, the number of parts can be reduced as compared with the case where two covers are used. Also, the number of joints with the box frame 1 is reduced, and the shielding effect against direct noise to the ground is enhanced.

The idea of using the inspection cover 15 in which the bottom cover 5 and the back cover 6 are integrated instead of the bottom cover 5 and the back cover 6 is equally applied to any of the second to fifth embodiments. be able to.

Next, a power converter housing assembly according to a seventh embodiment of the present invention will be described with reference to FIG. The feature of the seventh embodiment is that the bottom covers 5, 5a of the electric wire duct portions 13, 13a on both sides integrated at the center are different from the second embodiment shown in FIGS. In addition, the back covers 6, 6a of the box frames 1, 1a are replaced with one inspection cover 16.
It is characterized by having been replaced by.

With this configuration, the number of inspection covers can be reduced as compared with the case of the seventh embodiment, and integration can be strengthened.
The bottom covers 5, 5a and the rear covers 6, 6 are thus provided.
The configuration in which one inspection cover 16 is mounted instead of a can be equally applied to the third embodiment and the fifth embodiment as well as the second embodiment.

Next, a power conversion apparatus accommodating apparatus according to an eighth embodiment of the present invention will be described with reference to FIG. A feature of the eighth embodiment is that the terminal block 8 for relaying the wire-attached wires to the wire-attached wires 4 from the vehicle body side is deleted, and the wire-attached wires 4 drawn from the entrances at both ends in the rail direction of the box frame 1 are removed. The point is that it is configured to be directly connected to the terminal block 3 of the main circuit conversion unit 2. The other configuration is common to the first embodiment shown in FIGS.

As a result, the relay terminal block 8 inside the device can be omitted, and the number of parts can be reduced. In addition,
The configuration in which the relay terminal block 8 is omitted can be equally applied to the power conversion device housing device of another embodiment.

Next, a power converter housing assembly according to a ninth embodiment of the present invention will be described with reference to FIG. Ninth
The feature of this embodiment is that, for the power converter housing assembly of the second embodiment shown in FIG. 3 and FIG. The terminal blocks 8, 8a are deleted, and the cable wires 4, 4a drawn from the entrances at both ends in the rail direction of the box frames 1, 1a are directly connected to the terminal blocks 3, 3a of the main circuit conversion units 2, 2a. This is the point that is configured. The other configuration is the same as that of the second embodiment shown in FIGS.

As a result, the relay terminal block 8,
8a can be omitted, and the number of parts can be reduced.
The configuration in which the relay terminal blocks 8 and 8a are omitted can be equally applied to the power converter housing assembly of the other embodiments.

[0045]

As described above, according to the power converter housing apparatus of the first aspect of the present invention, the electric wire duct conventionally installed on the vehicle body side is constituted as a part of the power converter side, and the cable converter is installed. The structure is such that the electric wires are directed straight from the device to the motor for driving the vehicle, and the electric wire duct on the vehicle body side can be simplified.

According to the power conversion device accommodating device of the second aspect, in addition to the effects of the first aspect, a plurality of main circuit conversion units are arranged at both ends in the rail direction of the device, and Since the control unit is arranged in the middle of the main circuit conversion unit, the high-voltage main circuit wiring and the low-voltage control circuit wiring in the device can be easily separated, and the noise resistance can be improved.

According to the power converter accommodating device of the third aspect, in addition to the effects of the first or second aspect, both the electric wire duct portion and the main circuit conversion unit are inspected on the center side in the vehicle width direction. A detachable inspection cover is provided to allow the inspection to be performed, so that the cover of the wire duct and the inspection cover that opens and closes when inspecting the storage parts are separated from each other. The number of parts of metal fittings can be reduced, and since the cover is formed integrally, the seam between the cover and the box frame side is reduced, and the shielding effect against direct noise to the ground side is large.

According to the power converter accommodating device of the fourth aspect, in addition to the effects of the first to third aspects, the wire is inserted into the device through the wire inlet at the end face in the rail direction. Since it is directly connected to the main circuit conversion unit, it is possible to omit the feeder wire relay terminal block inside the device.

According to the power converter housing assembly of the fifth aspect of the present invention, the two power converter housings according to any one of the first to fourth aspects are opposed to each other on both sides in the direction of the sleeper under the floor of the vehicle. , And the wire ducts of both devices were connected and integrated, so compared to the conventional one-box configuration,
An inspection space is provided in the center of the vehicle body, which improves the workability of maintenance and inspection, and enables work outside the pit. In addition, each of the power conversion device accommodating devices constituting the assembly can be manufactured individually, and handling, transportation, etc. in the manufacturing operation can be performed in a divided state. It is more advantageous.

According to the power converter housing assembly of the invention of claim 6, in addition to the effect of the invention of claim 5, in addition to the effects of the invention of claim 5, each of the main circuit conversion units located on both sides in the direction of the sleeper can be moved to either end in the rail direction. Or the same end side, the main circuit conversion unit portion and the control unit portion of both power converters will be arranged separately in the rail direction, and the high voltage circuit portion and the low voltage circuit portion It is isolated in arrangement, and the noise resistance is improved.

According to the power converter housing assembly of the seventh aspect of the invention, in addition to the effect of the sixth aspect of the invention, one inspection cover is provided so as to extend over both of the connecting portions of the electric wire ducts. Is provided, the number of inspection covers and the number of parts can be further reduced, and the number of joints with the box frame can be further reduced to further enhance the shielding effect against direct noise.

[Brief description of the drawings]

FIG. 1 is a plan view of a power conversion device housing device according to a first embodiment of the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a plan view of a power converter housing assembly according to a second embodiment of the present invention.

FIG. 4 is a front view of the embodiment.

FIG. 5 is a plan view of a power converter housing assembly according to a third embodiment of the present invention.

FIG. 6 is a front view of the embodiment.

FIG. 7 is a plan view of a power conversion device housing device according to a fourth embodiment of the present invention.

FIG. 8 is a front view of the embodiment.

FIG. 9 is a plan view of a power converter housing assembly according to a fifth embodiment of the present invention.

FIG. 10 is a front view of the embodiment.

FIG. 11 is a plan view of a power conversion device housing device according to a sixth embodiment of the present invention.

FIG. 12 is a plan view of a power converter housing assembly according to a seventh embodiment of the present invention.

FIG. 13 is a plan view of a power conversion device housing device according to an eighth embodiment of the present invention.

FIG. 14 is a plan view of a power converter housing assembly according to a ninth embodiment of the present invention.

FIG. 15 is a plan view of a conventional power conversion device housing device having a longitudinal box configuration.

FIG. 16 is a front view of the above conventional example.

FIG. 17 is a front view of another conventional example of a longitudinal box configuration.

FIG. 18 is a plan view of a conventional power converter housing device having an integrated box configuration.

[Explanation of symbols]

 1, 1a, 1b Box frame 2, 2a, 2b Main circuit conversion unit 3, 3a, 3b Connection terminal 4, 4a, 4b Gear wire 5, 5a, 5b Bottom cover 6, 6a, 6b Back cover 7 Body 8, 8a , 8b Relay terminal block 9, 9a, 9b Main circuit conductor 13, 13a, 13b Wire duct section 14, 14a, 14b Control unit 15 Inspection cover 16 Inspection cover

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Eiko Sato 2-24-24 Harumi-cho, Fuchu-shi, Tokyo Toshiba Transport Engineering Co., Ltd. In-house (72) Inventor Masao Seino 1-Toshiba-cho, Fuchu-shi, Tokyo 5H115 PA00 PC02 PG01 PI29 PU01 PV01 UI34 UI38

Claims (7)

[Claims] 1. A power conversion device housing device for housing a power conversion device mounted under a floor of a vehicle, wherein a size of the device box frame in a sleeper direction is biased to one side from a center of a vehicle width. In this way, it is possible to attach another device to the position on the opposite side of the sleeper direction, and at the rail end of the device, a gear for electrically connecting the vehicle body side and the main circuit conversion unit side accommodated by itself. An accommodating device for a power conversion device, wherein an entrance portion of an electric wire is provided, and a wire duct portion is formed as a part of the device at an upper portion of a center side of a vehicle body of the device. 2. The apparatus according to claim 1, wherein a plurality of said main circuit conversion units are arranged at both ends in the rail direction of the apparatus, and a control unit is arranged in the middle of the main circuit conversion units at the both end positions. The power conversion device accommodating device according to claim 1. 3. A detachable inspection cover is provided at a center side in a vehicle width direction for detachably inspecting both the electric wire duct portion and the main circuit conversion unit.
Or the power converter housing device according to 2. 4. The cable feeder according to claim 1, wherein the wire feeder enters the device through a wire feeder inlet at an end face in a rail direction and is directly connected to the main circuit conversion unit. The power conversion device accommodating device according to claim 1. 5. An electric power conversion apparatus accommodating apparatus according to claim 1, wherein two of the electric power conversion apparatus accommodating apparatuses are arranged opposite to each other on both sides in a direction of the sleeper under a floor of the vehicle, and the electric wire ducts of the both apparatuses are arranged. A power converter housing assembly, wherein the parts are connected and integrated. 6. The power conversion device accommodating device according to claim 5, wherein the main circuit conversion units located on both sides in the sleeper direction are respectively arranged on the same end side on both ends in the rail direction. Device assembly. 7. The power converter housing assembly according to claim 6, wherein one inspection cover is provided so as to extend over both connection portions of the electric wire ducts.