JP3452504B2 - 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 for preventing adverse effects of water on a conductive part and an electric connection part in a main body that holds electric parts such as fuses and relays.

[0002]

2. Description of the Related Art Conventionally, various kinds of electric junction boxes have been known in which invading water is reduced. For example, FIG.
The one as shown in FIG. 9 is known. FIG. 7 is an exploded perspective view including an enlarged partial cross section showing an example of a conventional electrical junction box in which invading water is reduced. FIG. 8 is a partial vertical sectional view showing an assembling process of the main body and the lower cover in FIG. FIG. 9 is a partial assembly sectional view of FIG. 7.

Referring to FIGS. 7 to 9, a conventional electric connection box 51 holds an electric component 52 such as a fuse and a relay, and has a main body 53 having conductive parts and electric connection parts (not shown), and the main body 53. Is an electrical junction box that includes a lower cover 54 and an upper cover 56 that store water in a water-proof state, and further has a plurality of first lock portions 57 extending in the body insertion direction on the outer periphery of the body 53, Lower cover 54
Has an inner wall portion 55 having a second lock portion 58 extending in the body insertion direction for engaging with the first lock portion 57, and
The bottom plate 60 of the lower cover 54 has a die hole 59 for molding the lock portion 58.

Further, as shown in the partially enlarged cross section of FIG. 7, the first lock portion 57 has locking plates 62 on both sides of a pair of support plates 61 which are vertically provided on the outer periphery of the main body 53.
It is a male-shaped lock that is overhanging. As shown in FIGS. 8 and 9, a flexible lance 63 is provided between the support plates 61. The main body 53 above the lance 63 is provided with a support plate 65, which will be described later, and a flange 64 that comes into contact with the upper ends of the locking plates 66 for positioning. The second lock portion 58 is a female lock in which a locking plate 66 is extended inside a pair of support plates 65 that are vertically provided on the inner wall portion 55 of the lower cover 54. Then, as shown in FIG. 8 and FIG.
An interlocking projection 67 is provided on the inner wall portion 55 between which the tip of the flexible lance 63 is hooked.

In the electric junction box 51 having the above-described structure, first, as shown in FIG. 8, a main body 53, on which electric parts 52 such as fuses and relays are mounted, is guided from above the lower cover 54 to the inner wall portion 55 and fitted therein. Then, as shown in FIG. 9, the lance 63 bends and is locked to the lower end of the locking projection 67, so that the main body 53 cannot be pulled out upward. Further, at the same time, the flange 64 causes the pair of support plates 6 of the second lock portion 58 to come into contact.
5 and the upper end of the locking plate 66, the main body 53
Is no longer fitted below the inner wall 55. In this way, the main body 53 is completely positioned within the lower cover 54. Then, finally, the upper cover 56 is covered from above to complete the assembly of the electrical junction box 51.

[0006]

However, in the above-mentioned conventional electric junction box 51, as shown in FIG.
The support plate 65 and the locking plate 6 are attached to the bottom plate 60 of the lower cover 54.
There is a hole 59 in the mold for the slide core to form 6. Therefore, when it is used in a vehicle such as an automobile, the splash of water 70 from the running road surface or the splash of water 70 from a car wash will enter the lower cover 54 from below, so that it is provided on the back side of the main body 53. A short circuit accident or corrosion occurs in the conductive parts such as the bus bar and the electric connection part. Therefore, there is a problem that reliability and durability are reduced.
On the other hand, when electricity is applied to the electric component 52 mounted on the main body 53, heat is generated. In order to dissipate this heat, it is preferable to let the air 71 flow from the mold hole 59 into the lower cover 54, so it is not preferable to close the mold hole 59.

An object of the present invention is to provide an electric junction box which reduces water intrusion into the lower cover and allows air to flow therethrough and which is excellent in reliability and durability.

[0008]

Means for Solving the Problems The above object of the present invention is to:
It is achieved by the following configuration. 1: An electrical connection box comprising a main body that holds electric parts such as fuses and relays, and that has a conductive portion and an electric connection portion, and a lower cover and an upper cover that store the main body in a water-proof state. A plurality of first lock portions extending in the main body outer peripheral portion in the main body insertion direction, and a second lock portion extending in the main body insertion direction engaging with the first lock portion on the inner wall portion of the lower cover. And a hole 19 for a mold for molding the second lock portion in the lower cover, the second lock portion of the lower cover is provided until reaching the bottom plate, and the second lock is provided. The lower portion of the portion of the main body that is necessary for engaging the first lock portion of the main body is connected by a transfer wall, and a cutout portion is provided at a lower end portion of the transfer wall.
Vignetting, the second locking portion is formed in a box-shaped cross section by the inner wall portion and the passing wall, and a hole for the mold is surrounded by the box-shaped cross section, with the water to the main body rear side Invasion of
Reduced and through the box-shaped cross section and notch
An electrical junction box characterized by active air circulation . 2: The electric connection box according to the above 1, wherein an eaves-like projection is provided on the inner side of the upper portion of the cutout portion. 3: The electric connection box according to the above 1, wherein the hole for the mold is provided in the bottom plate of the lower cover. 4: A hole for the mold is provided between the upper end of the transfer wall and the inner wall of the lower cover, and a box-shaped cross section space is defined below the hole for the mold. The electrical junction box described in 1 above. The hole for the mold in the present invention means a portion which is open facing the inside of the electrical junction box,
The mold hole may be provided in the bottom plate as described in 3 above, or may be provided between the upper end portion of the transfer wall and the inner wall portion of the lower cover as shown in 4 above. .

According to the electrical connection box having the above-mentioned structure, the second lock portion of the lower cover is provided until reaching the bottom plate, and the second lock portion is provided with a portion necessary for engaging the first lock portion of the main body. The lower part is connected by a transfer wall, and the second lock portion is formed into a box-shaped cross section by the transfer wall and the inner wall part, and the box-shaped cross section surrounds the hole for the mold, Water entering from the inside cannot enter the lower cover unless it enters the narrow box-shaped cross section. Therefore, since the invasion of water into the back side of the main body is reduced, short-circuiting and corrosion of the conductive portion are prevented, and air can flow through the box-shaped cross-section portion, so that heat from the electric component is also generated. It can be dissipated and reliability and durability can be improved.

Further, when the cutout portion is provided at the lower end portion of the transfer wall, the circulation of the air becomes active, so that the heat dissipation from the electric parts becomes more active. Further, even if there is water that has entered the lower cover, it can be easily discharged. Therefore, the reliability can be further improved. Further, when the eave-shaped projection is provided on the inner side of the upper portion of the cutout portion, intrusion of the lower cover directly into the bottom plate from the cutout portion is suppressed, so that short circuit and corrosion of the conductive portion due to water are prevented. At the same time, a sufficient air flow hole for dissipating heat from the electric component is secured. Therefore, reliability and durability can be further improved. Further, when the hole for the mold is provided between the upper end portion of the transfer wall and the inner wall portion of the lower cover, and a box-shaped cross-sectional space is defined below the hole for the mold, the space inside the lower cover is formed. Furthermore, it becomes difficult for water to enter. Therefore, reliability and durability can be further improved.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
~ It will be described in detail with reference to FIG. FIG. 1 is an exploded perspective view including a partially enlarged cross-sectional view showing a first embodiment of an electric junction box of the present invention. FIG. 2 is a partial vertical sectional view of FIG. FIG. 3 is a partial vertical cross-sectional view showing a second embodiment of the electric junction box of the present invention. FIG. 4 is a partial vertical sectional view showing a third embodiment of the electrical junction box of the present invention. FIG. 5 is a perspective view showing a fourth embodiment of the electrical junction box of the present invention. 6 is shown in FIG.
FIG.

Referring to FIGS. 1 and 3, the electrical junction box 11
Is a main body 13 that holds electric components 12 such as fuses and relays, and has a conductive portion and an electric connection portion (not shown);
Lower cover 14 for housing the main body 13 in a water-proof state
And an upper cover 16. Furthermore, electrical junction box 1
Reference numeral 1 denotes a main body 13 having an outer peripheral portion having a plurality of first lock portions 17 extending in the main body insertion direction, and an inner wall portion 15 of the lower cover 14 extending in the main body insertion direction engaging with the first lock portion 17. Has a second lock portion 18, and a hole 19 for a mold for molding the second lock portion 18 is formed in the lower cover 14
The bottom plate 20 of

Further, as shown in a partially enlarged sectional view of FIG. 1, the first lock portion 17 has locking plates 2 on both sides of a pair of support plates 21 which are vertically provided on the outer peripheral portion of the main body 13.
2 is an overhanging male lock. As shown in FIG. 3, flexible lances 23 are provided between the support plates 21. The main body 13 above the lance 23 is provided with a support plate 25, which will be described later, and a flange 24 that comes into contact with the upper ends of the locking plates 26 for positioning.

Further, the second lock portion 18 has a lower cover 14
This is a female lock in which a locking plate 26 is extended inside a pair of support plates 25 that are vertically provided on the inner wall portion 15 of the lock plate 26. As shown in FIG. 3, the inner wall portion 15 between the support plates 25 is provided with a locking projection 27 which allows the tip of the flexible lance 23 to be hooked. Further, the second lock portion 18 is provided until it reaches the bottom plate 20 of the lower cover 14, and a portion below the portion required for the first lock portion 17 of the main body 13 to engage with the second lock portion 18 is formed by the transfer wall 28. A box-shaped cross section 30 is formed together with the inner wall 15. A cutout 29 is provided at the lower end of the transfer wall 28.

In the electric junction box 11 of the first embodiment having the above-mentioned structure, first, as shown in FIG. 1, the main body 13 on which the electric parts 12 such as fuses and relays are mounted is arranged from above the lower cover 14 to the inner wall portion 15. 2, the lance 23 bends and is locked to the lower end of the locking projection 27, so that the main body 13 cannot be pulled out upward. At the same time, the flange 24 is brought into contact with the upper ends of the pair of support plates 25 and the locking plate 26 of the second lock portion 18, so that the main body 13 is not fitted below the inner wall portion 15 any more. In this way, the main body 13 is completely positioned within the lower cover 14. Then, finally, the upper cover 16 is covered from above to complete the assembly of the electrical junction box 11.

In the first embodiment having the above-mentioned structure,
The second lock portion 18 of the lower cover 14 is provided until reaching the bottom plate 20, and the first lock portion of the main body 13 is attached to the second lock portion 18.
The lower portion of the lock portion 17 required to engage with the lock portion 17 is connected by a passing wall 28, and is formed into a box-shaped cross-section together with the inner wall portion 15. The box-shaped cross section 30 has holes 19 for the mold.
Since it is surrounded by water, water that has entered from below enters the narrow box-shaped cross section 30 or enters the lower cover 14 only through the lower cutout 29. Therefore, the invasion of the water 70 into the back side of the main body 13 is reduced, so that the corrosion of the conductive portion is prevented and the box-shaped cross-section portion 30 and the cutout portion 2 are formed.
Since the air 71 is actively distributed through 9, the heat from the electric component 12 can be sufficiently dissipated. Therefore, reliability and durability can be improved. Further, the notch portion 29 also has a function of draining water accumulated on the bottom plate 20 of the lower cover 14, so that it is effective for rust prevention of the conductive portion.

Next, the electric junction box 1 according to the second embodiment will be described with reference to FIG. This electric connection box 1 is different from the electric connection box 11 in the first embodiment in that
Only the notch 29 is not provided. Therefore,
The same components having the same purpose are denoted by the same reference numerals in FIG. 3 as those in FIGS. 1 and 2, and the detailed description of the configuration and operation is omitted. Since the electric junction box 1 does not have the notch 29, the water 70 entering from below can only enter the narrow box-shaped cross section 30. Therefore, as compared with the electric junction box 11 shown in FIG. 1, the intrusion of the water 70 can be significantly reduced. On the other hand, however, the passage of the air 71 is only in the box-shaped cross section 30, so that the heat dissipation from the electric component 12 causes the electric junction box 11 to dissipate.
Less than Further, the bottom plate 2 of the lower cover 14
If water accumulates on top of 0, it cannot be discharged downward, so we can only expect natural evaporation. Therefore,
The electric junction box 1 can be used under a use condition in which the amount of heat generated by the electric component 12 is small, coupled with its simple structure and easy manufacture.

Next, the electrical junction box 31 in the third embodiment will be described with reference to FIG. The electrical junction box 31 is different from the electrical junction box 11 in the first embodiment only in that an eaves-shaped protrusion 32 is provided inside the upper portion of the cutout portion 29. Therefore, the same components having the same purpose are denoted by the same reference numerals in FIG. 4 as those in FIGS. 1 and 2, and the detailed description of the configuration and operation is omitted. Since the electric connection box 31 has the eaves-shaped projection 32 provided inside the upper portion of the cutout portion 29, water is suppressed from entering the bottom plate 20 of the lower cover 14 directly from the cutout portion 29. Therefore, short circuit and corrosion of the conductive part due to water are further prevented, and a flow passage of the air 71 for dissipating heat from the electric component 12 is sufficiently secured. Therefore,
The reliability and durability can be further improved.

Next, the electrical junction box 41 in the fourth embodiment will be described with reference to FIGS. 5 and 6. This electric connection box 41 is the electric connection box 11 in the first embodiment.
Compared with, the following points are different. First, the second lock portion extends to the upper end of the lower cover. Secondly, the die hole 19 is not provided in the bottom plate, but is provided between the upper end portion of the transfer wall 28 and the inner wall portion 15 of the lower cover 14.
Thirdly, the bottom plate of the lower cover is inclined. Therefore, the same components having the same purpose as those of the first embodiment are denoted by the same reference numerals as those in FIGS. 1 and 2 in FIGS. The hole 19 for the die is the transfer wall 2
It is provided between the upper end of 8 and the inner wall portion 15 of the lower cover 14, and below the hole 19 for the mold, the transfer wall 28 and the inner wall portion 15 form a narrow box-shaped cross section. Therefore, the water that has entered the electrical junction box 41 from below is
If the water does not enter the lower cover 14 unless it enters the narrow box-shaped cross section and then passes through the mold hole 19, the intrusion of the water 70 into the back side of the main body 70 is greatly reduced.

Further, the electrical junction box 41 includes the lower cover 14
Since the bottom plate 20 is inclined, by forming a hole in the lowest portion of the bottom plate 20, even if water enters the lower cover 14, drainage is possible. Therefore, the cutout portion 19 as in the first embodiment is not required at the lower end portion of the transfer wall 28 of the second lock portion 18. Further, as shown in FIG. 5, by increasing the area of the transfer wall 28 and not forming the cutout portion 19 as in the first embodiment, warpage of the side wall of the lower cover 14 is prevented and the strength is increased. .

[0021]

As described above, in the present invention
The electrical connection box comprises a main body that holds electric parts such as fuses and relays, and that has a conductive portion and an electrical connection portion, and a lower cover and an upper cover that store the main body in a water-proof state. And having a plurality of first lock portions extending in the main body outer peripheral portion in the main body insertion direction, and extending in the main body insertion direction engaging with the first lock portion on the inner wall portion of the lower cover. An electric connection box having a second lock portion and a die hole 19 for molding the second lock portion in the lower cover, the second lock portion of the lower cover is provided until reaching the bottom plate, A lower portion of the second lock portion, which is lower than a portion required to engage the first lock portion of the main body, is connected by a transfer wall, and a lower end portion of the transfer wall
Is provided with a cutout portion, the second lock portion is formed by the transfer wall and the inner wall portion into a box-shaped cross section, and the box-shaped cross section surrounds the hole for the mold, , Back of the body
The intrusion of water to the side is reduced and the box-shaped cross section and
The flow of air became active through the notch .
Therefore, the second lock portion of the lower cover is provided until it reaches the bottom plate, and a portion lower than a portion required for the first lock portion of the main body to engage with the second lock portion is connected by a transfer wall, (2) Since the lock portion is formed in a box-shaped cross section by the transfer wall and the inner wall portion, and the hole for the mold is surrounded by the box-shaped cross section, water that has entered from below has a narrow box-shaped cross section. It cannot be put into the lower cover unless it goes into the section. Therefore, since the invasion of water into the back side of the main body is reduced, short-circuiting and corrosion of the conductive portion are prevented, and air can be circulated through the box-shaped cross-section portion, so that heat from the electric component is also generated. It can be dissipated and reliability and durability can be improved.

Further, when the cutout portion is provided at the lower end portion of the transfer wall, the circulation of the air becomes active, so that the heat dissipation from the electric parts becomes more active. Further, even if there is water that has entered the lower cover, it can be easily discharged. Therefore, the reliability can be further improved. Furthermore, when the eave-shaped protrusion is provided on the inner side of the upper portion of the cutout portion, the intrusion of the lower cover directly into the bottom plate from the cutout portion is suppressed, so that short circuit and corrosion of the conductive portion due to water are further prevented. At the same time, a sufficient air flow path is secured for the heat to be dissipated from the electric components. Therefore, reliability and durability can be further improved. Further, when the die hole is provided between the upper end portion of the transfer wall and the inner wall portion of the lower cover, and a narrow box-shaped cross-sectional space is defined below the die hole, the inside of the lower cover is formed. It becomes more difficult for water to enter. Therefore, reliability and durability can be further improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view including a partially enlarged cross-sectional view showing a first embodiment of an electric junction box of the present invention.

FIG. 2 is a partial vertical cross-sectional view of FIG.

FIG. 3 is a partial vertical cross-sectional view showing a second embodiment of the electric junction box of the present invention.

FIG. 4 is a partial vertical sectional view showing a third embodiment of the electrical junction box of the present invention.

FIG. 5 is a perspective view showing a fourth embodiment of the electrical junction box of the present invention.

6 is a partial vertical cross-sectional view of FIG.

FIG. 7 is an exploded perspective view including a partially enlarged cross-sectional view showing an example of a conventional electrical junction box in which invading water is reduced.

8 is a partial vertical cross-sectional view showing an assembly process of the main body and the lower cover in FIG.

9 is a partial assembly cross-sectional view and an operation explanatory view in FIG. 7.

[Explanation of symbols]

1 electrical junction box 11 Electric connection box 12 electrical components 13 body 14 Lower cover 15 Inner wall 16 Upper cover 17 First lock part 18 Second lock part 19 Hole for mold 20 Bottom plate 28 Passing wall 29 Notch 30 Box-shaped section 31 electrical junction box 32 eaves-shaped protrusion 41 electrical junction box

Claims (4)

(57) [Claims] 1. An electrical connection box comprising a main body which holds electric parts such as fuses and relays, and which has a conductive portion and an electrical connection portion, and a lower cover and an upper cover which store the main body in a water-proof state. A plurality of first lock portions extending in the main body outer peripheral portion in the main body insertion direction, and extending in the main body insertion direction engaging with the first lock portion on the inner wall portion of the lower cover. An electric connection box having two lock portions and having a hole 19 for a mold for molding the second lock portion in the lower cover, wherein the second lock portion of the lower cover is provided until reaching the bottom plate, and The lower part of the second lock part, which is necessary for the first lock part of the main body to engage with the main body, is connected by a transfer wall, and a cutout part is provided at a lower end part of the transfer wall. By the transfer wall and the inner wall portion Is shaped in the form section, surrounded the holes for the mold in the box-shaped cross section, having been, together with the entry of water into the main body rear side is reduced,
Active air circulation through the box-shaped cross section and notch
Electrical connection box, characterized in that the so that. 2. The electric junction box according to claim 1, wherein an eaves-shaped projection is provided on the inner side of the upper portion of the cutout portion. 3. The electrical junction box according to claim 1, wherein the die hole is provided in the bottom plate of the lower cover. 4. The hole for the mold is provided between the upper end of the transfer wall and the inner wall of the lower cover, and a box-shaped cross-sectional space is defined below the hole for the mold. The electric connection box according to claim 1, wherein the electric connection box is provided.