JPH06314887A - Electric circuit component waterproof installation mechanism - Google Patents

Abstract

PURPOSE:To enhance the maintenance of circuit elements installed in a waterproof box when installing electric circuit components, such as a chopper controller of an electric car. CONSTITUTION:A removable waterproof box comprises a board 1 which constitutes the bottom of the box and a cover 10 which constitutes the upper part of the box. Electric circuit elements are installed in the waterproof box while terminals 20 and 21 are constructed on the end of the board and the upper part of the cover 10 in conformity with this position. These terminals are connected with a flexible conductor 34 wound around the outside of the cover. The terminal 21 of the board 1 penetrates the upper part insulation board 22 and the lower part insulation board 23 which clamp the board 1 and conductor bolts 31 and nuts 32 which penetrate a penetration hole formed on the board 1 and fasten therewith and the bolts are furnished with screws 31 so as to mount the conductors, thereby connecting the terminal 20 of the cover 10 to outside elements.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof installation mechanism for electric circuit parts.

[0002]

2. Description of the Related Art For an electric circuit, such as a controller for a drive motor of an electric vehicle, which may have adverse conditions such as water infiltration after installation, how to ensure waterproofness when installing the parts, , Waterproofness is one of the important issues.

Further, in the installation of electric circuit parts, it is one of important issues to install the electric circuit parts so that they can be easily replaced or repaired in case of maintenance or failure.

Of course, like the controller described above,
In an electric circuit that controls electric power, a relatively large amount of heat is generated from the power semiconductor element during operation, and this heat causes thermal runaway of the semiconductor element and deterioration of reliability. In doing so, how well the generated heat is dissipated, that is, heat dissipation is also an important issue.

[0005]

Conventionally, a terminal portion provided for connection between an electric circuit installed in a waterproof box and the outside is a component of the box, for example, a substrate forming a bottom of the box. Since it is provided on either side of the lid configured above and directly connects the circuit element inside the box and the external element through this terminal part, workability and maintenance at the time of installation It is relatively difficult to obtain goodness and goodness.

For example, if the terminal portion is provided on the board side, the connecting position with the external element becomes the bottom portion of the box body, which makes the connection work troublesome, and if the terminal portion is provided on the lid body side, the work for removing the lid body is performed. It becomes troublesome and the maintainability deteriorates. The present invention aims to solve such problems.

[0007]

In order to solve the above-mentioned problems, in the present invention, a detachable waterproof installation box is constructed from a substrate constituting a bottom portion and a lid constituting an upper portion thereof,
The electric circuit component is installed in the waterproof installation box, and the terminal portion is formed on the end of the board and the upper side of the lid corresponding to this position, and the space between these terminals is turned to the outside of the lid. The upper and lower insulating plates sandwiching the substrate, and the bolts and nuts of the conductors that are tightened by penetrating the insulating plates and the insertion holes formed in the substrate. The present invention proposes a waterproof installation mechanism for electric circuit parts, which is configured by, and is provided with a conductor mounting screw on the bolt, and the terminal portion of the lid body is used for connection with an external element.

The present invention proposes to form a bolt detent groove in the upper insulating plate in the above structure.

[0009]

In the present invention described above, the circuit element inside the box and the external element are electrically connected by the terminal portion formed on the lid side, so that the connecting work is easy.

Further, when the circuit element in the box body is maintained or broken down, the wiring with the external element connected to the terminal portion on the upper side of the lid and the upper portion of the flexible conductor are removed so that these wiring materials can be removed. Since the lid can be opened by removing the lid, the lid can be easily removed, and thus maintenance, repair, replacement, etc. of the circuit element in the box can be easily performed. In some cases, the lid can be opened while the wiring and the flexible conductor are still connected.

Due to the flexibility of the flexible conductor, the above work can be easily performed.

The bolt of the conductor which constitutes the terminal portion formed on the substrate side is prevented from rotating by engaging with the detent groove formed in the upper insulating plate, so that reliable connection can be performed.

[0013]

Embodiments of the present invention will now be described with reference to the accompanying drawings. 1 to 5 show an embodiment in which the electric circuit component installation mechanism of the present invention is applied to a chopper control circuit of a drive motor of an electric vehicle, and FIG. 1 is a configuration of a box body in which a cylindrical lid body is omitted. It shows an example of a portion. (Note that the tubular lid is indicated by a chain double-dashed line.) Also, FIGS. 2 and 3 are cross-sectional views of the state where the tubular lid is mounted, and are respectively AA of FIG.
3 shows a cross section of a portion corresponding to a line and a line BB.
Further, FIG. 4 is a cross-sectional view for explaining an attaching or detaching operation of the tubular lid body. Further, FIG. 5 is a perspective view showing constituent elements of the terminal portion 21, and FIG. 6 is a cross-sectional view of a main part of the terminal portion 21.

In these drawings, reference numeral 1 is a rectangular substrate which constitutes the bottom of a box body which will be described later, and the substrate 1 is made of an aluminum plate. In the center of the substrate 1, a heat-dissipating conductive thick plate 2 is provided upright in parallel with the long side. The heat-dissipating conductive thick plate 2 is made of an aluminum plate, and the seven heat pipes 3 are embedded at predetermined intervals so that the upper portions thereof project upward. A common heat radiation fin 4 is provided on top of them.

Through holes 5 penetrating vertically are formed between the heat pipes 3 embedded in the heat-dissipating conductive thick plate 2, and water is applied to the portions of the substrate 1 corresponding to these through holes 5. A hole 6 is formed.

Reference numeral 7 is a water receiving plate forming a peripheral wall 8'having a flange portion 8. The water receiving plate 7 is attached to the upper side of the heat radiating conductive thick plate 2, and the heat radiating conductive plate is formed. A drain hole 9 is formed at a location corresponding to the through hole 5 formed in the elastic thick plate 2. A side wall 9'is formed below the drain hole 9 by burring, and the side wall 9'is mounted in the through hole 5.

Therefore, the water on the water receiving plate 7 flows from the drain hole 9 into the through hole 5 and drops in the heat dissipation conductive thick plate 2,
It drops downward through the water drain hole 6 of the substrate 1.

Reference numeral 10 is a tubular lid, and an upper edge 12 having a hanging wall 11 located inside the peripheral wall 8 of the water receiving plate 7 is formed on the upper side of the tubular lid 10, and the lower side is formed. Is formed with a lower edge 14 having a hanging wall 13 corresponding to the outside of the outer periphery of the substrate 1. The opening 15 surrounded by the upper edge 12 is larger than the planar shape of the heat dissipation fin 4 of the heat pipe 3.

In the above structure, the tubular lid 10 can be attached / detached by passing the heat radiation fin 4 through the opening 15. When the tubular lid 10 is mounted, the watertight packing 16 is interposed between the upper edge 12 and the flange portion 8 of the water receiving plate 7, and the lower edge 14 and the substrate 1
A watertight packing 17 is interposed between the peripheral edges of the box, and in this state, by fixing with a clamp or bolts (not shown), a waterproof box can be constructed.

A groove 18 is formed on the peripheral edge of the substrate 1 inside the abutting portion of the watertight packing 17, and a drain hole 19 opening to the lower surface of the substrate 1 is formed in a part of the groove 18. ing.

Therefore, if a small amount of water is used, the watertight packing 1
Even if it enters through 7, the water falls into the groove 18 and is discharged from the drain hole 19.

The upper portion on the one end side of the tubular lid is formed lower than the other, and constitutes the first terminal portion 20 there. The terminal portion 20 is constituted by a terminal block having a structure in which a connecting electrode is not provided on the bottom portion and is planarly connected as a mounting surface. Therefore, wiring is not made to pass through the front and back sides of the tubular lid 10 via the terminal portion 20.

A terminal portion 21 is formed on one end side of the substrate 1 corresponding to the terminal portion 20. Reference numerals 22 and 23 denote an upper insulating plate 22 and a lower insulating plate 23, respectively, which are configured to sandwich the substrate 1, and at desired positions at the corresponding positions of the substrate 1, the upper insulating plate 22, and the lower insulating plate 23, respectively. The number of insertion holes 24, 25, 26 corresponding to the number of connection points are formed. At this time, the diameter of the insertion hole 24 of the substrate 1 is formed larger than the diameter of the insertion holes 25 and 26 of the upper insulating plate 22 and the lower insulating plate 23. In addition to the substrate 1, the upper insulating plate 22 and the lower insulating plate 2
Mounting holes 28 through which the mounting screws 27 are inserted are formed at the corners of each of the three.

On the upper side of the upper insulating plate 22, a long groove 29 having a wider width is formed around the insertion hole 25, and on the lower side of the lower insulating plate 23, around the insertion hole 26. A circular groove 30 having a diameter larger than this is formed.

Reference numeral 31 is a hexagon bolt formed of a conductor,
Further, 32 is a nut. A conductor mounting screw 33 is provided on the head of the hexagon bolt 31. This hexagon bolt 31
Has the width of the head slightly smaller than the width of the long groove 29,
The diameter of the shaft portion is formed slightly smaller than the diameter of the insertion holes 25 and 26.

Reference numeral 34 is a flexible conductor. For example, the flexible conductor 34 is formed into a strip shape or the like with a number of wire-shaped or strip-shaped conductors corresponding to the number of the connection points with an insulating resin at a predetermined interval. Integrally configured. Introductory electrode portions 35 and 36 having a fork terminal shape or an annular shape are formed on both ends of the flexible conductor 34 in order to connect to the connection points of the respective terminal portions 20 and 21.

In the above structure, after the substrate 1 is held by the upper insulating plate 22, the lower insulating plate 23, and the mounting screw 27, the shaft portions of the hexagon bolts 31 are inserted from the upper insulating plate 22 side into the insertion holes 25, Inserted into 24 and 26, lower insulating plate 23
Introducing the introduction electrode portion 36 at the lower end of the flexible conductor 34 in the circular groove 30 and configuring the terminal portion 21 by fitting and tightening the nut 32, the lower end side of the flexible conductor 34 is connected. be able to. At this time, the head portion of the hexagon bolt 31 is engaged with the long groove 29 to prevent rotation and prevent rotation. An appropriate washer 37 is used for tightening the hexagon bolt 31 and the nut 32 by screwing.

Before or after the above-mentioned operation, the conductors of the head of the bolt 31 which support the respective components on the heat radiating thick plate 2 and the substrate 1 and which constitute the connection points between these components and the terminal portion 21. The mounting screws 33 are connected to each other by wiring or a bus bar 38 to form a predetermined electric circuit.

For example, reference numeral 39 is a power semiconductor element such as a power transistor, and the semiconductor element 39 is attached to the heat radiating plate 2 by a predetermined electrical insulation and thermally coupled. Reference numeral 40 is a contactor, 41 is a DC-DC converter, and these components are also mounted with the heat radiating thick plate 2 as a supporting member. Further, reference numerals 42 and 43 respectively denote a condenser and a control signal processing board, which are mounted on the board 1.

Then, as described above, the cylindrical lid 10 is fixed above the substrate 1. Then, the flexible conductor 34 is attached to the tubular lid 1
0 is arranged upward along the side wall on the one end side of 0, and the upper introduction electrode portion 36 is connected by a conductor mounting screw or the like forming the connection point of the terminal portion 20 and wiring from an external element is connected here. This makes it possible to electrically connect the circuit element inside the box and the external element.

In the case of maintenance or failure of the circuit element in the box body, the wiring 44 with the external element connected to the upper terminal portion 20 of the tubular lid 10 and the introduction electrode portion 36 at the upper end of the flexible conductor 34 are provided. By removing it, the tubular lid 10 can be opened to these wiring members. Then, by appropriately moving the flexible conductor 34 outward, the tubular lid 10 can be easily removed above the substrate 1, so that maintenance, repair, replacement, etc. of the circuit elements inside the box can be performed easily. be able to. In some cases, the tubular lid body 10 may be removed upward without removing the wiring member.

Since the flexible conductor 34 connected between the terminal portion 21 of the substrate 1 and the terminal portion 20 of the tubular lid 10 is flexible as described above, the tubular lid 10 can be easily attached and detached. be able to.

[0033]

As described above, according to the present invention, the terminal portion for connecting the wiring from the external element to the circuit element installed in the waterproof box body composed of the substrate and the lid is provided with the lid. Since it is configured on the upper part of the body, wiring work in this part is easy. Moreover, the terminal portion for connecting the inside and outside of the box body is provided on the substrate at the bottom of the box body, and this terminal portion and the terminal portion at the top of the lid body are formed by a flexible conductor arranged outside the box body. Since the connection is made, the lid can be easily removed by removing the wiring or the like connected to the terminal portion of the lid.

Therefore, the present invention is optimally applied to a device such as a chopper controller of a drive motor in an electric vehicle which is exposed to water after installation and which requires regular maintenance and inspection.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a portion excluding a tubular lid body in a configuration of an electric circuit component installation mechanism of the present invention.

FIG. 2 shows a usage state of the electric circuit component installation mechanism of the present invention,
It is explanatory drawing represented as a cross section of the location corresponding to the AA line of FIG.

FIG. 3 shows a state of use of the electric circuit component installation mechanism of the present invention,
It is explanatory drawing represented as a cross section of the location corresponding to the BB line of FIG.

FIG. 4 is an explanatory view showing, in the electric circuit component installation mechanism of the present invention, a mounting or removing operation of the cylindrical lid body with respect to the box body as a cross section of a portion corresponding to the line AA in FIG. 1. is there.

FIG. 5 is a perspective view showing constituent elements of a terminal portion installed on a substrate.

FIG. 6 is a cross-sectional view of a main part of a terminal part installed on a substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Conductive thick plate for heat dissipation 3 Heat pipe 4 Heat dissipation fin 5 Through hole 6 Drain hole 7 Water receiving plate 8 Flange part 8'Circumferential wall 9 Drain hole 9'Cylinder wall 10 Cylindrical lid 11 Hanging wall 12 Upper edge 13 Hanging wall 14 Lower edge 15 Opening 16 Watertight packing 17 Watertight packing 18 Groove 19 Drain hole 20, 21 Terminal part 22 Upper insulating plate 23 Lower insulating plate 24, 25, 26 Insertion hole 27 Mounting screw 28 Mounting Hole 29 Long groove 30 Circular groove 31 Hexagon bolt 32 Nut 33 Conductor mounting screw 34 Flexible conductor 35, 36 Introducing electrode portion 37 Washer 38 Bus bar 39 Semiconductor element 40 Contactor 41 DC-DC converter 42 Capacitor 43 Control signal processing board 44 External Wiring with elements

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masatsugu Kobayashi 1-3-1 Shimotsuruma, Yamato-shi, Kanagawa Vehicle Industry Co., Ltd. (72) Inventor Juzo Kawanaka 2-6-1, Marunouchi, Chiyoda-ku, Tokyo No. Furukawa Electric Co., Ltd. (72) Inventor Takashi Murase 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Within Furukawa Electric Co., Ltd.

Claims (2)

[Claims] 1. A waterproof installation box comprising a substrate constituting a bottom portion and a lid body constituting an upper portion thereof is detachable, and electric circuit parts are installed in the waterproof installation box, and an end portion of the substrate is provided. , A terminal portion is formed on the upper side of the lid body corresponding to this position, and these terminal portions are connected by a flexible conductor which is turned to the outside of the lid body, and the terminal portion of the board is on the upper side of the board. And the lower insulating plate, and bolts and nuts of conductors that penetrate and tighten the insulating plates and the insertion holes formed in the board. Electrical circuit component waterproof installation mechanism characterized by being configured for connection with elements 2. A waterproof installation mechanism for electric circuit parts, wherein the upper insulating plate according to claim 1 is formed with a locking groove for bolts.