JPH0583899A - Terminal box for rotary electric machine - Google Patents

Abstract

PURPOSE:To raise the sealing effect by putting a rubber gasket between the main body of a terminal box and the peripheral L-shaped part of the cover of the terminal box. CONSTITUTION:The main body of a terminal box 2 is fastened to a motor 1 with a fastening bolt 6. The junction face of the terminal box body 2 and the cover 4a of the terminal box is fastened with fastening bolts 5 through a rubber gasket 3a. For this junction part, since a peripheral L-shaped part 8 of the cover 4a exists, the rubber gasket 3a is bent into L-shape, and besides it forms sealed condition at the compressive part of the rubber gasket 3a being caught by the terminal box body 2 and the peripheral L-shaped part of the cover 4a. Hereby, the sealing effect can be raised.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a terminal box of a rotary electric machine.

[0002]

2. Description of the Related Art As shown in the sectional view of FIG. 12, a structure of a conventional terminal box of a rotary electric machine has a tightening bolt between a terminal box body 2 and a terminal box 4b attached to an electric motor 1 with a rubber packing 3b interposed therebetween. It is a structure for tightening and sealing with 5.

In the structure of this conventional terminal box, in order to eliminate the gap between the joint surfaces of the terminal box body and the cover, it is necessary that the fastening bolts 5 have a small pitch interval as shown in FIG. In this case, it is necessary to use five fastening bolts 5, and there is a drawback in that the number of bolts used is large.

That is, the conventional joint surfaces of the terminal box main body and the terminal box cover are flat surfaces, and the space between them is fastened with the fastening bolts through the flat rubber packing. It was necessary to use a lot.

[0005]

In the structure for sealing the joint surface between the terminal box body and the cover, in the conventional structure, the number of fastening bolts used is increased so that the fastening bolts There is a drawback that the gap between the joint surfaces cannot be eliminated unless the pitch interval is reduced.
That is, there is a drawback that the number of fastening bolts used becomes large and the time required for assembling becomes long.

That is, the rubber packing 3 is provided on the mating surfaces of the terminal box body 2 and the terminal box cover 4b.
When tightened with the fastening bolts 5 through b, as shown in FIG. 5, between the terminal box cover 4b and the rubber packing 3b and between the terminal box body 2 and the rubber packing 3b in the vicinity of the YY 'cross section. In both cases, the rubber packing 3b is compressed and no gap is generated. However, a gap 7 is generated in the central portion XX ′ cross section between the fastening bolts 5 and 5. The reason why the gap 7 is generated is that the rubber packing 3b is compressed by the fastening bolt 5, but the rubber packing 3b is not compressed in a portion apart from the fastening bolt 5, that is, in the vicinity of the XX ′ cross section of FIG. Thicker,
Both the main body 2 of the terminal box and the cover 4b of the terminal box are deformed into a convex shape, and as a result, the gap 7 is generated.

An object of the present invention is to reduce the number of fastening bolts used to about one-third the number of fastening bolts used for fastening the joint surface between the terminal box body and the cover. .. That is, it is an object of the present invention to reduce the number of fastening bolts to be used and to maintain the sealing effect of the joint surface, and to reduce the time required for assembly due to the small number of fastening bolts to be used.

[0008]

In the present invention, a rubber packing is sandwiched between the terminal box body and the outer peripheral L-shaped portion of the cover of the terminal box to obtain a sealing effect.

[0009]

A gap 7 is formed in the sectional view (FIG. 9) of the intermediate portion XX 'between the fastening bolts 5. However, as shown in FIG. 10, the sealing effect can be achieved by the compressed portion of the rubber packing 3a sandwiched between the outer peripheral L-shaped portion of the terminal box cover 4a and the terminal box body 2. As a result, when the number of fastening bolts is small, a gap is generated between the fastening bolts, but a sealing effect for the outer peripheral L-shaped portion of the terminal cover is obtained.

[0010]

EXAMPLE As shown in FIG. 1, a terminal box body 2 is fastened to an electric motor 1 with fastening bolts 6. The joint surface between the terminal box main body 2 and the cover 4a of the terminal box is fastened with the fastening bolt 5 via the rubber packing 3a. In the structure of this joint, as shown in FIG. 1, the rubber packing 3a is bent into an L shape due to the L shape of the outer circumference of the cover, and the L shape of the outer circumference of the terminal box body 2 and the cover. The structure of the terminal box that forms a sealed state at the compression margin of the rubber packing sandwiched between the parts.

The dimensional relationship between the thickness A of the rubber packing 3a and the clearance B between the terminal box body 2 and the terminal cover 4a is as shown in FIG.
B). For the dimension C between the terminal box cover 4a and the body of the terminal box, (C>
0).

As shown in FIG. 3, a gap 7 is formed at the intermediate portion tightened by the fastening bolt 5 in the XX 'sectional view at the intermediate portion as shown in FIG. The reason why the gap 7 is generated is that when the fastening bolt 5 is used for fastening as shown in FIG. 3, the rubber packing 3b becomes thin at the YY ′ portion of the fastening portion, but the distance X from the fastening bolt is large. No restraint is applied at the −X ′ part. Therefore, the main body 2 of the terminal box and the terminal box cover 4b, which are thin sheet metals, are curved in a convex state, and a gap 7 is generated.

In this embodiment, an outer peripheral L-shaped portion 8 of the terminal box cover 4a is provided as shown in the sectional view of the terminal box in FIG.
And the rubber packing 3a between them and the fastening bolt 5. At this time, the rubber packing 3a is larger than the outer peripheral surface of the terminal box body 2. Therefore, the cover 4a of the terminal box is also bent into an L-shape along the outer peripheral L-shape.

On the other hand, as shown in the sectional view of FIG. 2, the relationship between the distance A between the cover 4a of the terminal box and the terminal box body 2 and the thickness A of the rubber packing 3a is (B <
Since it is A), since the rubber packing 3a is compressed, a gap is eliminated and a sealing effect can be obtained. Therefore, in the structure of the terminal box according to the present embodiment, as shown in FIG. 9, although there is a gap 7 generated by tightening with the fastening bolt 5, the L-shaped structure provided on the outer periphery of the cover of the terminal box. The action of the portion 8 has a sealing effect on the outer periphery and the side surface portion of the terminal box, so that the sealing can be obtained. For this reason, the fastening bolt 5 required to eliminate the gap 7 in the XX ′ portion of FIG. 9 in the conventional structure can be omitted.

In the present embodiment, in order to obtain a sealing effect of a kind of container called a terminal box, the terminal box and the terminal cover are fastened with fastening bolts. This is a structure in which an L-shaped brim portion is provided in the portion and a hermetic seal is provided here. Therefore, since there is a gap in the part of the joining plane, the number of fastening bolts can be set to four at the four corners of the terminal box, and as many as 12 or 16 or more in the conventional structure can be used. It is possible to obtain the sealing effect of the terminal box container without using the fastening bolts.

As a result, the time required for tightening and assembling the cover of the terminal box can be greatly shortened and an effect can be obtained. (The time required for tightening can be shortened to 1/3 to 1/4 from the number of tightening bolts used.) (Other Embodiments) The same operation is performed when the terminal box has a rectangular or circular shape. The effect is obtained.

[0017]

EFFECTS OF THE INVENTION In a kind of closed container called a terminal box, the number of fastening bolts used at the joint surface of the main body of the terminal box and the cover is reduced compared to the conventional structure, and the usage is about 1/3 to 1/4. The effect which can be made into the number is acquired. As a result, the effect of shortening the time required for assembly can be obtained.

[Brief description of drawings]

FIG. 1 is an overall view of a motor showing an embodiment of the present invention,

FIG. 2 is a sectional view of a terminal box of the present invention,

FIG. 3 is a detailed view of a joint surface,

FIG. 4 is a sectional view taken along line XX ′ in FIG.

5 is a sectional view taken along line YY ′ in FIG.

FIG. 6 is a detailed view of a joint surface of a conventional structure,

7 is a sectional view taken along line XX ′ in FIG.

8 is a sectional view taken along line YY ′ of FIG.

FIG. 9 is a detailed view of a joint surface of the present invention,

10 is a sectional view taken along line XX ′ of FIG.

11 is a sectional view taken along line YY ′ of FIG.

FIG. 12 is an overall view of a conventional method,

FIG. 13 is an external view of the structure of a conventional terminal box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electric motor 2 ... Terminal box main body 3a, 3b ... Rubber packing 4a, 4b ... Terminal box cover 5 ... Fastening bolt 6 ... Fastening bolt 7 ... Gap 8 ... Outer peripheral L-shaped part of cover

Claims (1)

[Claims] 1. A structure for tightening a fastening bolt between a main body of a terminal box and a cover via a rubber packing, wherein the periphery of the cover is L-shaped and the side surface of the joint surface of the terminal box main body is L around this cover
A terminal box for a rotating electric machine, which has a seal structure in which a rubber packing is sandwiched between the terminal box and the character-shaped portion.