JP2004196134A - Metallic casing for electric appliance mounted in vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a sealing property of a metallic casing and reduce the number of fastening bolts by changing a structure of a metallic cover. <P>SOLUTION: This metallic casing for an electric appliance mounted in a vehicle has a skirt part 1b perpendicular to a flange face at a tip end of a jointing flange 1a of a metallic cover 1. The skirt part 1b is provided in a manner to cover a lateral end face of a cover fixing face 2a of a metallic case 2. Because a shielding member, namely the skirt part 1b exists on lateral end faces of the jointing flange 1a and the cover fixing face 2a, a shielding property against electromagnetic noises is improved, so as to reduce a number of fastening bolts. That is to say, a structure is simply changed in a manner that the skirt part 1b is provided to the metallic cover 1, so that the electromagnetic noises generated from the electric appliance installed inside the metallic casing can be effectively prevented from leaking. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention improves the effect of preventing electromagnetic noise leakage and water intrusion by reducing the structure of a metal housing for a vehicle-mounted electric device, particularly, the structure of the metal housing, and reduces the number of fastening bolts. The present invention relates to a metal housing for electric equipment mounted on a vehicle.
[0002]
[Prior art]
2. Description of the Related Art Various electric devices are mounted on vehicles such as automobiles for controlling electric power. The electric equipment includes, for example, an inverter used as a power converter, a converter for raising and lowering a DC voltage, and the like. Electric devices represented by these inverters and converters perform high-voltage, large-current power control, and therefore become sources of electromagnetic noise. Since this electromagnetic noise has an adverse effect on peripheral devices, it is necessary to prevent its propagation. As a countermeasure for this, a method of housing an electric device in a metal case made of a conductive material has been implemented. Generally, an aluminum alloy, a steel plate, or the like is employed as the conductive material.
[0003]
In addition, since electric devices such as an inverter and a converter are mounted in an engine room, for example, when an automobile runs on a waterway, it is expected that water will rebound. As a countermeasure against this, it is necessary that the metal housing for housing the above-described electric device has a waterproof structure.
[0004]
In order to solve such a problem, a conventional metal housing for a vehicle-mounted electric device (hereinafter, referred to as a metal housing) has a structure exemplified below. A conventional metal housing will be described with reference to FIGS. FIG. 1 shows a perspective view of a conventional metal housing and an enlarged view of a portion A in the perspective view. FIG. 2 is a diagram illustrating the structure of a conventional metal housing, and is a diagram illustrating a cross section taken along line BB in FIG.
[0005]
The conventional metal housing shown in FIGS. 1 and 2 includes a metal cover 1 and a metal case 2. The metal case 2 has a cover fixing surface 2a at the opening end. On the other hand, the metal cover 1 has a joining flange 1a at a portion joined to the cover fixing surface 2a of the metal case 2. The joining flange 1a has a concave structure 3 at the joint with the cover fixing surface 2a, and the shield member 4 can be installed in the concave portion. Generally, a material having elasticity such as rubber is used for the shield member 4. The metal cover 1 is joined to the metal case 2 in a state where the shield member 4 is fitted into the recessed structure 3, and is fastened with bolts 5 to form a closed housing.
[0006]
Here, the shield member 4 is a member used for assembling the metal cover 1 and the metal case 2 in a detachable manner and obtaining airtightness. The metal cover 1 and the metal case 2 are hermetically closed by being fastened with bolts 5, thereby preventing leakage of electromagnetic noise generated from electric equipment inside the housing and preventing water from entering from outside the housing ( For example, see Non-Patent Document 1).
[0007]
[Non-patent document 1]
Toyota Motor Corporation Service Department, "Prius New Model Vehicle Manual", October 14, 1997, p. 1-13, drawing number QJ5325
[0008]
[Problems to be solved by the invention]
However, the metal housing shown in the related art has to use a large number of bolts in order to improve the sealing performance. The number of bolts is determined from the viewpoint of preventing leakage of electromagnetic noise generated from electric equipment inside the housing and preventing water from entering from outside the housing, and the structure of the metal housing according to the related art is determined. Then, it was difficult to reduce the number of bolts. Further, since the number of bolts to be attached is large, it is not possible to reduce the working time and the number of parts, and it has not been possible to respond to the demand for cost reduction demanded by the manufacturing industry in recent years.
[0009]
An object of the present invention is to solve the above-described problems, and to improve the hermeticity of a metal housing by changing the structure of a metal cover and reduce the number of fastening bolts. It is in. By reducing the number of fastening bolts, the efficiency of assembling the metal housing and the number of parts can be reduced, and the cost can be reduced.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, a metal housing for a vehicle-mounted electric device according to the present invention includes a metal case having a cover fixing surface at an open end, and a flange joined to the cover fixing surface of the metal case. A metal cover. In addition, the metal case and the metal cover sandwich the shield member between the cover fixing surface and the joining flange, and are fastened with bolts to form a sealed housing, which is used to reduce electromagnetic noise generated from electric devices inside the sealed housing. Prevents leakage and prevents water from entering the enclosure. Further, the metal cover is provided with a skirt portion orthogonal to the flange surface at the tip of the joining flange.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a metal housing for a vehicle-mounted electric device according to an embodiment of the present invention will be described with reference to FIGS. FIG. 3 shows a perspective view of the metal housing according to the present invention and an enlarged view of a portion C in the perspective view. FIG. 4 is a diagram illustrating the structure of the metal housing according to the present invention, and is a diagram illustrating a cross section taken along line DD in FIG. Members that are the same as or similar to the members shown in the above-described conventional technology are denoted by the same reference numerals, and description thereof is omitted.
[0012]
A characteristic of the metal housing according to the present invention shown in FIGS. 3 and 4 is that the metal cover 1 has a skirt portion 1b at the tip of the joining flange 1a, which is orthogonal to the flange surface. The skirt portion 1b is provided over the entire circumference of the metal cover 1, and is installed so as to cover the lateral end surface of the cover fixing surface 2a of the metal case 2.
[0013]
In the metal housing of the prior art, since there is nothing to shield on the side end surfaces of the joining flange 1a and the cover fixing surface 2a, the sealing performance of the metal housing is improved by increasing the number of fastening bolts, The aim was to prevent leakage of electromagnetic noise.
[0014]
On the other hand, according to the present invention, since the shielding member called the skirt portion 1b exists on the lateral end surfaces of the joining flange 1a and the cover fixing surface 2a, the shielding performance against electromagnetic noise is improved, and the number of fastening bolts can be reduced. it can. In other words, by simply changing the structure of the metal cover 1 by providing the skirt portion 1b, it is possible to effectively prevent the leakage of electromagnetic noise generated from the electric device installed inside the metal housing.
[0015]
The present invention is also excellent from the viewpoint of preventing water from entering from outside the metal housing. In the case of a conventional metal housing having nothing to shield on the lateral end surfaces of the joining flange 1a and the cover fixing surface 2a, water is directly applied to the joining surface of the joining flange 1a and the cover fixing surface 2a. Would. Therefore, in the case of the related art, a certain number or more of fastening bolts is required to enhance the effect of the shield member 4 and maintain the waterproofness of the metal housing, and the number of fastening bolts cannot be reduced. Was.
[0016]
On the other hand, in the case of the present invention, since the shielding member called the skirt portion 1b is present, water is not directly applied to the joining surface between the joining flange 1a and the cover fixing surface 2a, so that the intrusion of water from outside the housing is effective. Can be prevented. Therefore, the waterproof property of the metal housing is improved, and the number of fastening bolts can be reduced.
[0017]
Further, by providing the skirt portion 1b on the metal cover 1, the positioning when joining the metal cover 1 and the metal case 2 can be performed reliably and easily, and the working time can be reduced.
[0018]
In the present embodiment, the metal case in which the shield member 4 is fitted in the concave structure 3 of the metal cover 1 is illustrated, but the present invention is limited to the metal case having such a structure. Instead, any structure can be used as long as the metal case 2 has the same effect, such as having the recessed structure 3 on the metal case 2 side and the shield member 4.
[0019]
【The invention's effect】
As described above, according to the present invention, in the metal housing formed by fastening the cover fixing surface of the metal case and the joining flange of the metal cover with bolts, the front end of the joining flange of the metal cover has a flange. A skirt portion perpendicular to the plane was provided. By providing the skirt portion, it is possible to improve the effect of preventing leakage of electromagnetic noise generated from electric devices inside the metal housing and preventing water from entering from outside the metal housing. As described above, according to the present invention, it is possible to improve the hermeticity of the metal housing and reduce the number of fastening bolts by making a simple structural change of providing the skirt portion on the metal cover. By reducing the number of fastening bolts, the efficiency of assembling work of the metal housing and the number of parts can be reduced, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a conventional metal housing for a vehicle-mounted electric device and an enlarged view of a portion A in the perspective view.
FIG. 2 is a diagram illustrating a structure of a conventional metal housing for a vehicle-mounted electric device, and is a diagram illustrating a cross section taken along line BB in FIG.
FIG. 3 is a perspective view of a metal housing for a vehicle-mounted electric device according to the present invention and an enlarged view of a portion C in the perspective view.
FIG. 4 is a diagram illustrating a structure of a metal housing for a vehicle-mounted electric device according to the present invention, and is a diagram illustrating a cross section taken along line DD in FIG.
[Explanation of symbols]
1 metal cover, 1a joining flange, 1b skirt, 2 metal case, 2a cover fixing surface, 3 concave structure, 4 shield member, 5 bolts.

Claims (1)

A metal case with a cover fixing surface at the open end,
A metal cover having a flange joined to the cover fixing surface of the metal case,
Has,
The metal case and the metal cover sandwich the shield member between the cover fixing surface and the joining flange and form a closed housing by being fastened with bolts,
In a metal housing for vehicle-mounted electrical equipment that prevents leakage of electromagnetic noise generated from electrical equipment inside the sealed housing and prevents water from entering from outside the sealed housing,
The metal cover has a skirt portion orthogonal to the flange surface at the end of the joining flange,
A metal housing for on-vehicle electrical equipment, characterized in that:

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