JP3141752B2 - Electrical junction box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connection box used in an automobile or the like, and more particularly, to a pair of connection legs projecting laterally from a fusible link body containing a fusing portion therein. The present invention relates to an electrical junction box to which a fusible link (lateral leg type fusible link) provided with a part can be attached, and more particularly to improvement in waterproofness of this type of electrical junction box.

[0002]

2. Description of the Related Art Conventionally, various electric junction boxes for automobiles have been provided. FIGS. 4A and 4B show an example of this type of electric connection box, in which a main body 5 having a fusing portion (not shown) is built in, and the main body 5 projects laterally from the main body 5 and has a distal end. A pair of connection legs 6a, provided with connection holes 7a, 7b,
A fusible link mounting portion 11 for mounting a fusible link (lateral leg type fusible link 9) having 6b is provided on the upper wall portion 12a of the upper case 12.

[0003] The fusible link mounting portion 11 includes:
It has a flat plate-shaped main body arrangement portion 13 and a pair of rectangular openings 14a and 14b provided on both sides of the main body arrangement portion 13. A cylindrical shape is provided around the main body arrangement portion 13 and the openings 14a and 14b. Is provided.

On the other hand, the lower case 19 of the electric junction box has
Busbars 24a, 24b,..., 25a, 25b, etc. are stacked with insulating plates 21a, 21b, 21c, 23a, 23b interposed therebetween. Further, bolting portions 29a and 29b having nuts 27a and 27b attached to the ends thereof project from the bottom wall 19a of the lower case 19 at positions facing the openings 14a and 14b on the upper case 12 side. .

The stacked bus bars 24a, 24b,.
Of the bus bars 25a, 25b, a part of the bus bars 24b, 25a is protruded from the bus bar laminated portions 26A, 26B and bent upward, and further, the connecting portion 31 is provided by bending the front end portion horizontally. A connection hole 32 is provided at a tip portion of the connection portion 31. This connecting portion 31
The bus bar 24a, which is located at the upper end of the bolted portion 29a, 29b and is the uppermost layer of the bus bar laminated portions 26A, 26B,
25a. On the other hand, the lateral leg type fusible link 9 attached to the fusible link attachment portion 11 is inserted from the upper opening 17a side of the protective wall portion 17, and the main body 5 is arranged on the upper surface of the main body disposing portion 13, A pair of connecting legs 6a, 6b are arranged in the openings 14a, 14b, respectively. In this state,
Bolts 36a, 36b via washers 35a, 35b
To the connection holes 7a and 7b of the connection legs 6a and 6b of the fusible link 9 and the connection portions 31 of the bus bars 24a and 25a.
Through the connection hole 32 provided in the
The nuts 27a and 27b are attached to the tips of the nuts 27a and 27b. Thus, the connecting portions 31 of the burs bars 24a, 25a and the connecting legs 6a,
6bb is electrically connected, and the fusible link 9 is fixed to the fusible link mounting portion 11.

As described above, the fusible link mounting portion 11
Even if the fusible link 9 is attached to the
There is a gap 38 between the openings 14a, 14b and the connecting legs 6a, 6b, and a state is established in which the space from the upper end opening 17a of the protective wall 17 to the inside of the electric connection box is in communication. But,
When fixing the lateral leg type fusible link 9 and connecting to the bus bar laminated portions 26A and 26B by bolting, the openings 14a and 14b are indispensable in structure.

[0007] Therefore, when this type of electric junction box is placed in a place where water is likely to be splashed, such as an engine room of an automobile, a cover composed of an upper cover for accommodating the electric junction box and a lower cover (not shown) is provided. A packing member is provided between the upper cover and the lower cover (or the lower case) to hermetically seal the inside, thereby preventing intrusion of moisture.

Further, in order to discharge moisture that has entered the inside of the electric junction box, a slope is provided in the bottom wall portion 19a of the lower case 19, and a drain hole 19 is formed below the slope.
b is provided.

[0009]

However, even if the interiors of the upper cover and the lower cover are sealed as described above,
In the case of a high-pressure car wash or the like, moisture may enter between the upper cover and the lower cover. In this case, the moisture that has penetrated into the inside from the upper end opening 17a of the protective wall portion 17 through the openings 14a and 14b flows to the bottom wall 19a of the lower case 19 along a path indicated by a dotted line L1 in FIG. When it reaches, the infiltrated water is discharged to the outside of the electric connection box from the water drain hole 19b.

However, in this electric junction box, the bus bar laminated portions 26A, 26A,
Since 26B is located, there is a possibility that the moisture that has entered inside reaches the busbar stacked portions 26A and 26B.
In particular, the connection position (bus bar connection portion 39) where the connection portion 31 of the bus bar 24a, 25a and the connection leg portion 14a, 14b of the fusible link 9 are bolted (the bus bar connection portion 39) is the uppermost bus bar 24a of the bus bar stacked portions 26A, 26B. , 2
5a, the openings 14a, 14
As shown by the dotted line L2 in FIG.
9 and reach the busbar laminated portions 26A and 26B,
The bus bar circuit may cause an electric leakage.

The present invention relates to the above-described lateral leg type fusible.
The purpose of the present invention is to solve a problem in an electric junction box to which a link can be attached.For example, even when moisture enters from a fusible link attaching portion, the moisture does not reach the bus bar laminated portion. The purpose is to make sure that it can be discharged outside.

[0012]

Accordingly, the present invention provides a fusible link mounting portion for a lateral leg type fusible link having a main body arrangement portion and a pair of openings provided on both sides of the main body arrangement portion. The upper case side is provided, while the lower case side is provided with a bus bar laminated portion formed by laminating a plurality of bus bars, and the lateral leg type fusible link connection leg portion and the bus bar constituting the bus bar laminated portion are formed in the opening. In the electric connection box connected by bolting at the portion, the connecting position of the connecting portion of the fusible link and the connecting portion of the bus bar is located below the lowermost bus bar of the bus bar laminated portion. An electric connection box is provided.

In the electric junction box according to the first aspect of the present invention, even when moisture intrudes from the gap between the opening and the connecting leg of the fuselable link, the connecting position of the connecting leg of the fusible link and the connecting portion of the bus bar. However, since it is located below the lowermost bus bar of the bus bar lamination portion, no water is transmitted to the bus bar lamination portion side.

According to a second aspect of the present invention, there is provided a protective wall portion surrounding the main body disposing portion and the opening, and a lower side of the protective wall portion is connected to a connecting position between the connecting leg of the fusible link and the connecting portion of the bus bar. The electrical junction box according to claim 1, wherein the electrical junction box extends so that a lower side of the protective wall portion partitions between the bus bar laminated portion and the opening.

In the electric junction box according to the second aspect, since the lower side of the protective wall partitions the space between the bus bar laminated portion and the opening as described above, it is possible to further ensure that moisture is transmitted to the bus bar laminated portion. Can be prevented.

According to a third aspect of the present invention, a fusible link mounting portion for a lateral leg type fusible link having a main body arranging portion and a pair of openings provided on both sides of the main body arranging portion is provided on the upper case side. A busbar laminated portion formed by laminating a plurality of busbars is provided on the side, and the connecting leg portion of the lateral leg type fusible link and the busbar constituting the busbar laminated portion are connected by bolting at the opening portion. In the electrical junction box, the upper case is provided with a tapered concave portion tapering downward in a central portion of the main body disposing portion on which the fusible link is placed, and a drainage communicating with the tapered concave portion. An electric junction box is provided, wherein a tubular portion provided with a hole is protruded below the main body disposing portion, and the tubular portion extends to the bottom wall of the lower case. Than it is.

In the electrical junction box according to the third aspect, a cylindrical portion provided with a tapered concave portion in the center portion of the main body disposing portion toward the lower side and a drain hole communicating with the tapered concave portion is provided on the main body disposing portion. Because it protrudes below the part, the water that has entered between the upper surface of the main body arrangement part and the main body of the fusible link flows from the tapered recess to the drain hole and reaches the bottom wall of the lower case, Moisture does not flow to the busbar lamination portion side.

According to a fourth aspect of the present invention, there is provided the electrical junction box according to the third aspect, wherein the cylindrical portion provided with the drain hole penetrates a bottom wall of the lower case.

In the electric junction box according to the fourth aspect, since the cylindrical portion provided with the drain hole penetrates the bottom wall of the lower case, the cylindrical portion provided between the upper surface of the main body arrangement portion and the main body of the usable link. The moisture that has entered the water is discharged from the tapered recess through the drain hole to the outside of the electrical junction box.

According to a fifth aspect of the present invention, there is provided the electrical junction box according to the third aspect, wherein a lower end of the cylindrical portion provided with the drain hole is located above a bottom wall of the lower case. is there.

In the electric junction box according to the fifth aspect, since the lower end of the tubular portion provided with the drain hole is located above the bottom wall of the lower case, the upper surface of the main body disposing portion is in contact with the upper surface of the lower case.
Moisture entering between the link bodies flows to the bottom wall side,
There is no transmission to the bus bar lamination.

[0022]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 and 2
An electric connection box 51 according to the embodiment of the present invention shown in FIGS. 1A and 1B is an electric connection box for a vehicle disposed in an engine room of the vehicle, and includes an upper cover 52 fixed in the engine room. And a lower cover 53 (shown only in FIG. 1). The electric connection box 51 includes an upper case 55 and a lower case 56 which are assembled to each other by locking means (not shown), and is fixed in the cover 54 by locking means 57 provided on the upper case 55.

The upper case 55 is provided with a fuseable link mounting portion 59 for mounting the lateral leg type fusible link 9. The fusible link mounting portion 59 includes a main body arranging portion 60 for arranging the main body 5 of the lateral leg type fusible link 9, and a pair of rectangular openings 61 a and 61 b is provided on both sides of the main body arranging portion 60. Provided. These main body arrangement portion 60 and openings 61a, 6
A cylindrical protective wall 63 is provided around 1b.

The protective wall 63 is provided with an upper case 55.
The upper wall portion 55a protrudes on both sides of the upper surface 55b side and the lower surface 55c side. The main body arranging portion 60 is provided inside the lower end portion of the protective wall portion 63, and portions surrounded by the protective wall portions 63 on both sides of the main body arranging portion 60 form openings 61a and 61b.

In the central portion of the main body disposing portion 60, a tapered concave portion 65 tapering downward is provided. Further, the main body disposing portion 60 has the tapered concave portion 65.
A cylindrical portion 67 provided with a drainage hole 66 communicating with the water is protruded downward. The lower end portion 67 a of the cylindrical portion 67 is inserted into an insertion hole 56 c provided in the bottom wall portion 56 a of the lower case 56, and projects to the outside of the lower case 56. Therefore, the upper surface of the main body disposing portion 60 communicates with the outside of the electric connection box 51 via the tapered recess 65 and the drain hole 66.

On the other hand, the lower case 56 has a bottom wall portion 56a inclined from the left side to the right side in FIG. 2A, and a plate is provided on the right end portion of the bottom wall portion 56 located at the lower end side of the inclination. A drain hole 56b penetrating in the thickness direction is provided.

The bottom wall 56a of the lower case 56
Are provided with a bus bar laminated portion 71 in which bus bars 69a, 69b, 69c... Are laminated with insulating plates 68a, 68b, 68c interposed therebetween. The connecting legs 6a and 6b of the fusible link 9 attached to the electric connection box 51.
Are connected to the bus bar laminated portions 71, respectively.
(A) shows only the bus bar laminated portion 71 connected to one connecting leg 6a. The bus bar laminated portion connected to the other connection leg 6b is disposed on the front side in the direction perpendicular to the paper surface, and only a connection portion 75 of the connection bus bar described later is shown.

Further, a pair of short columnar bolted portions 71a, 71b are provided on the bottom wall portion 56a of the lower case 56 at a position facing the openings 61a, 61b.
Housing recesses 72a and 72b are provided at the top end of the bolting portions 71a and 71b, and the housing recesses 72a and 72b are provided.
The nuts 73a and 73b are attached to a and 72b.

Further, the bottom wall portion 56 of the lower case 56
In a, a through hole 56c for inserting the cylindrical portion 67 on the upper case 55 side is provided at a position of the projecting portions 71a and 71b facing the main body disposing portion 60 on the upper case 55 side.

The bus bar 69 of the bus bar stacking section 71
a, 69b, bus bar 69d located at the lowest level
Is a bus bar (connection bus bar) for connecting a bus bar circuit to the fusible link 9. The connection bus bar 69d has one end protruding from the bus bar lamination portion 71. The protruding portion is bent downward, and the distal end portion is bent horizontally to provide a connection portion 75. The connection portion 75 is provided with a connection hole 76 penetrating in the thickness direction. Thus, the connection bus bar 69
Since the connecting portion 75 of d is provided at the tip of the portion bent downward, the connecting portion 75 is located below the lowermost bus bar 69d of the bus bars 69a, 69b,. I have.

In this embodiment, the lower portion of the protective wall 63 protruding into the electric connection box 51 is provided so as to extend to the vicinity of the connection portion 75 of the connection bus bar 69d. Reference numeral 71 denotes an opening 61 of the fusible link mounting portion 59 by the lower side of the protection wall 63.
a, 61b side.

The lateral leg type fusible link 9 attached to the fusible link attachment portion 59 has a protective wall 63.
The main body 5 is disposed on the upper surface of the main body disposing portion 60, and a pair of connecting legs 6a and 6b are disposed on the opening portions 61a and 61b, respectively. In this state, the bolts 36a and 36b are inserted into the insertion holes 7a and 7b of the connection legs 6a and 6b of the fusible link 9 and the connection holes 76 of the connection bus bar 69d through the washers 35a and 35b, and the protrusions are formed. 71a, 7
1b is screwed into nuts 73a, 73b attached to the tip of
The connecting portion 75 of the connecting bar bar 69d and the fusible
The connecting legs 6a and 6b of the link 9 are electrically connected, and the fusible link 9 is fixed to the fusible link mounting portion 59. As described above, the connection portion 75 of the connection bus bar 69d is the lowermost bus bar 69 of the bus bars 69a, 69b.
d, the connecting bus bar 69d and the connecting legs 6a of the usable link 9 are connected to each other.
Connection position where 6b is bolted (bus bar connection part 79)
Are also located below the lowermost bus bar 69d of the bus bar laminated portion 71.

As described above, the electric connection box 51 is accommodated inside the upper cover 55 and the lower cover 56. However, during high-pressure car washing or the like, moisture penetrates into the inside from the gap between the upper cover 55 and the lower cover 56. In addition, there is a case where the moisture permeates into the upper end opening 63a of the protective wall 63.

As shown by the dotted line L3 in FIG. 2A, the moisture that has entered between the upper surface of the main body arrangement portion 60 and the main body 5 of the fusible link 9 out of the infiltrated water, The water is discharged to the outside of the lower case 56 from the tapered concave portion 65 provided in the central portion through the drain hole 66.

As shown by the dotted line L4 in FIG. 2 (B), the bolts 61a, 61
Moisture that has entered the bus bar connection portion 79 formed at the tip of the bottom wall 1b flows directly through the bolting portions 61a and 61b to the upper surface of the bottom wall portion 56a of the lower case 56, and is further inclined as described above. The water is discharged to the outside of the lower case 56 from the drain hole 56b along the portion 56a. As described above, since the bus bar connecting portion 79 is located below the lowermost bus bar 69d of the bus bar laminating portion 71, even if moisture reaches the bus bar connecting portion 79, it may flow to the bus bar laminating portion 71 side. Absent.

Further, in the present embodiment, the bus bar laminated portion 71 and the fusible
Since the openings 61a and 61b on the link mounting portion 59 side are separated from each other, the water does not flow directly into the bus bar laminated portion 71.

As described above, in the electric junction box 51 of the present embodiment, even when moisture intrudes into the inside from the fusible link attachment portion 59 to which the lateral leg type fusible link 9 is attached, the moisture is transferred to the bus bar laminated portion 71. The water is reliably discharged from the drain holes 56b and 66 without flowing to the outside.
It is possible to reliably prevent the water from leaking into the bus bar circuit due to the intrusion of moisture into the bus bar laminated portion 71.

FIG. 3 shows a second embodiment of the present invention. In the second embodiment, the through hole provided in the bottom wall portion 56a of the lower case 56 is eliminated, and the lower end portion of the cylindrical portion 67 is positioned near the upper surface of the bottom wall portion 56a. In this case, as shown by the dotted line L5, the water that has entered between the upper surface of the main body disposing portion 60 and the main body 5 of the fusible link 9 is transferred to the bottom wall portion of the lower case 56 through the tapered recess 65 and the drain hole 66. It reaches the upper surface of 56a, and is discharged to the outside through the drain hole 56b along the bottom wall portion 56a. Since other structures and operations of the second embodiment are the same as those of the above-described first embodiment, the same components are denoted by the same reference numerals and detailed description thereof will be omitted.

Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example, although the electric junction box according to the above embodiment is an electric junction box for an automobile arranged in an engine room, the electric junction box of the present invention is not limited to that arranged in the engine room. The electrical junction box according to the invention is not limited to vehicles.

[0040]

As is clear from the above description, since the connecting position of the connecting leg of the fusible link and the connecting portion of the bus bar is located lower than the lowermost bus bar of the bus bar laminated portion, the opening portion is formed. Even if moisture enters through the gap between the connecting legs of the busbar and the usable link, moisture is not transmitted to the busbar laminated portion side, preventing the water from entering the busbar laminated portion and causing the busbar circuit to leak. it can.

According to the second aspect of the present invention, since the lower side of the protective wall partitions the space between the bus bar laminated portion and the opening, the transmission of moisture to the bus bar laminated portion can be more reliably prevented.

According to the third aspect of the present invention, a tapered concave portion is provided in the main body disposing portion, and a tubular portion provided with a drain hole communicating with the tapered concave portion is provided protruding below the main body disposing portion. Therefore, the water that has entered between the upper surface of the main body disposing portion and the main body of the fusible link flows from the tapered concave portion to the drain hole, so that the intruded moisture does not flow to the bus bar laminating portion side, and the It can be prevented that water enters the busbar circuit and the busbar circuit leaks.

In the electric connection box according to the fourth aspect, since the cylindrical portion provided with the drain hole penetrates the bottom wall of the lower case, the upper surface of the main body disposing portion is in contact with the upper surface of the lower case.
Moisture that has entered between the link bodies is discharged from the tapered recess through the drain hole to the outside of the electric connection box, and can be prevented from flowing to the busbar laminated portion side.

In the electric junction box according to the fifth aspect, since the lower end of the cylindrical portion provided with the drain hole is located above the bottom wall of the lower case, the upper surface of the main body disposing portion is in contact with the upper surface of the lower case.
Moisture entering between the link bodies flows to the bottom wall side,
It can be prevented from flowing to the busbar lamination portion side.

[Brief description of the drawings]

FIG. 1 is a partially sectional side view showing a first embodiment of an electric junction box according to the present invention.

FIG. 2 shows an electric junction box according to the first embodiment,
(A) is a partial sectional view, and (B) is a partial plan view.

FIG. 3 is a partial cross-sectional view illustrating an electric junction box according to a second embodiment of the present invention.

4A and 4B show an example of a conventional electric junction box, in which FIG. 4A is a partial sectional view, and FIG. 4B is a partial plan view.

[Explanation of symbols]

 5 Body 6a, 6b Connection leg 7a, 7b Connection hole 9 Lateral leg-type fusible link 35a, 35b Washer 36a, 36b Bolt 60 Main body arrangement part 65 Tapered recess 56b, 66 Drain hole 68a-68c Insulating plate 69a- 69d Bus bar 71a, 71b Bolt stop 73a, 73b Nut

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 85/22 H02G 3/16 B60R 16/02

Claims (4)

(57) [Claims] A fusible link mounting portion for a lateral leg type fusible link having a main body disposing portion and a pair of openings provided on both sides of the main body disposing portion is provided on an upper case side, and a plurality of fusible link mounting portions are provided on a lower case side. The busbar laminated part which laminates the busbar of the above is provided,
A connecting leg of the link, the bus bars constituting the bus bar laminated unit in the electrical connection box to be connected by bolting the portion of the opening, the connecting portion of the connecting leg and the bus bar of the heat Yujiburu link An electric connection box, wherein a connection position is located below a lowermost busbar of a busbar laminated portion. Wherein a protective wall which surrounds the periphery of the body placement part and the opening, the lower side of the protective wall portion of the connecting portion of the connecting leg and the bus bar of the human Yuji <br/> Bull link The electric connection box according to claim 1, wherein the electric connection box extends to a connection position, and a lower side of the protection wall portion partitions between the bus bar lamination portion and the opening. 3. A fusible link mounting portion for a lateral leg type fusible link having a main body disposing portion and a pair of openings provided on both sides of the main body disposing portion is provided on the upper case side, and a plurality of fusible link mounting portions are provided on the lower case side. The busbar laminated part which laminates the busbar of the above is provided,
In an electric connection box for connecting a link connecting leg portion and a bus bar constituting the bus bar laminated portion by bolting at the opening portion , a fusible link is placed on the upper case.
Taper downward at the center of the body
A cylindrical portion provided with a tapered concave portion and a drainage hole communicating with the tapered concave portion is protruded below the main body disposing portion, and the cylindrical portion is extended to the bottom wall portion of the lower case. ing
An electric junction box characterized by the above . 4. The lower end of said cylindrical portion is a bottom wall of a lower case.
Protruding outward through the part, or above the bottom wall
The electrical junction box according to claim 3, wherein the electrical junction box is located.