JP4043883B2 - Electrical junction box - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to an electrical junction box used in the middle of connection between, for example, a vehicle battery (power source) and various electrical devices mounted on the vehicle.
[0002]
[Prior art]
Conventionally, for example, a vehicle battery and an electrical device mounted on a vehicle such as an alternator, a heater, and a fan are electrically connected by a wire harness that branches in a complicated manner. And the electric junction box is connected to the wire harness between the battery and the electric device for the purpose of distributing the electric power supplied from the battery to these electric devices and protecting these electric devices from overcurrent. Has been.
[0003]
As shown in FIG. 4, the conventional electrical junction box 5 includes a resin housing 51, a board assembly 61 including electrical components such as relays, and a bus bar 62 (see FIG. 4, only one representative is shown), a fuse 63 for circuit protection that is fitted in the housing 51 and interposed in each of the independent electric circuits, and an upper case made of resin that accommodates these components 52 and the lower case 70, and a heat radiating plate 80, etc., one end of which is housed inside the electrical junction box and the other end is led out of the electrical junction box.
[0004]
The heat radiating plate 80 is a so-called power plate, and is a flat heat pipe. One of the two aluminum plates is embossed by pressing, and the other flat plate is metal-bonded by brazing. A space formed by processing is filled with a liquid for heat transport.
[0005]
Then, the substrate assembly 61 is fixed to both sides of the heat radiating plate 80 (both sides on the inside end portion of the electrical junction box), and the other end is led out of the electrical junction box. As shown schematically in FIG. It is fixed to the panel P via fasteners such as bolts, and heat is radiated to the panel P from the entire side surface of the other end.
[0006]
Here, the electrical circuit formed in the electrical junction box 5 is, for example, a large current circuit formed between a battery and a vehicle-mounted component such as an alternator, The current circuit is roughly classified into a small current circuit formed between a battery and a vehicle horn or lights. In particular, the amount of heat generated by a relay provided in a large current circuit or a medium current circuit cannot be ignored, and the role of the heat radiation plate 80 is important in conjunction with the recent miniaturization of electrical connection boxes and the diversification of internal electrical circuits. It has become.
[0007]
[Problems to be solved by the invention]
On the other hand, because of the structure and function of the heat radiating plate 80, one end is in close contact with an electrical component inside the electrical junction box and the other end is led out of the electrical junction box. It is necessary to prevent moisture from entering from the outside. The electric junction box is often installed in an engine room of a vehicle, for example, and is in an installation environment in which splash of rainwater in the engine room is directly splashed. In addition, since the temperature difference of the heat radiating plate 80 is instantly equalized due to its function, a temperature difference from the ambient temperature is likely to occur. Therefore, it is important to prevent moisture from entering.
[0008]
Hereinafter, a structure for preventing moisture intrusion in the heat radiation plate lead-out portion of the conventional electrical junction box 5 will be described.
[0009]
As shown in FIG. 6, ribs 71 facing the heat radiating plate lead-out portion of the lower case 70 are formed at regular intervals as the heat radiating plate waterproof structure of the conventional electrical junction box 5. That is, the rib 71 is formed in a slit shape to form waterproof slit portions 71a and 71b, and the heat dissipation plate 80 is fitted to the waterproof slit portions 71a and 71b. And the penetration | invasion of the water | moisture content from this part is blocked | prevented by prescribing | regulating the space | interval of a waterproof slit part inner wall and the heat radiating plate 80 strictly narrowly.
[0010]
However, in such a structure, there is a possibility that moisture may be transmitted through a narrow gap between the inner walls of the waterproof slits 71a and 71b and the heat radiating plate 80 and enter the electric junction box due to a so-called capillary phenomenon. Once moisture enters the inside of the electrical junction box, the individual electrical circuits that are mechanically coupled to the end portions of the heat radiating plate are short-circuited.
[0011]
Further, there are the following related related structures for preventing such moisture intrusion.
(1) Japanese Laid-Open Patent Publication No. 2000-23332 This publication discloses a waterproof structure for an electric junction box for automobiles and a drainage channel provided in the electric junction box. (2) Japanese Laid-Open Patent Publication No. 10-322845. The gazette discloses a waterproof structure for an electric junction box for automobiles, and has a drainage hole provided in the junction box.
[0012]
However, these known examples are simply electric junction boxes provided with drainage channels or drainage holes, which is insufficient as a waterproof measure.
[0013]
An object of the present invention is to provide an electrical junction box that prevents moisture from entering inside through a heat radiating plate portion.
[0014]
[Means for Solving the Problems]
In order to solve the above problems, an electrical junction box according to the present invention is:
A housing with an upper case and a lower case;
A wiring body housed in the housing;
An electrical component housed in the housing and electrically connected to the wiring body;
In the electrical junction box having a heat radiating plate that is led out from the inside of the housing to the outside of the housing and dissipates heat generated by the electrical components to the outside of the housing,
The housing is equipped with a waterproof slit,
The waterproof slit is formed of a waterproof slit forming ribs pair of opposed formed obliquely with respect to edge of the lower case of the housing,
A part of the heat dissipation plate is fitted between the waterproof slit forming ribs,
A seal member is surrounded by a part of the heat radiating plate so as to be elastically adhered to the waterproof slit, and the casing is adjacent to the waterproof slit and around the heat radiating plate by an interval between the waterproof slits. In addition, an enlarged gap portion is formed, and a drainage hole is formed in the gap portion at a position that is vertically downward in a state where the electric junction box is attached to the attachment target object. .
[0015]
The moisture is prevented from entering the inside of the electrical junction box along the creeping surface of the heat radiating plate through a seal member that is in close contact with a part of the waterproof slit. Further, the moisture that enters due to the capillary phenomenon through the gap between the waterproof slit and the heat radiating plate is accumulated in the enlarged gap portion, thereby preventing further penetration into the electric junction box. And the water | moisture content collected in this clearance gap is discharged | emitted to the exterior of an electrical-connection box through the drainage hole formed in the perpendicular direction downward direction of the clearance gap.
Further, by forming a waterproof slit with such ribs, the electrical junction box itself can be reduced in size and weight.
[0016]
Moreover, the electrical junction box according to claim 2 of the present invention is the electrical junction box according to claim 1,
Before SL gap portion is constituted by a gap portion formed ribs,
A part of the gap portion forming rib forms an angle with the heat radiating plate, and an end portion of the gap portion forming rib is close to the heat radiating plate to form a water stop rib.
[0017]
By constituting a part of the gap The inter forming ribs as water stop ribs, the penetration of moisture along the creeping of the heat dissipation plate is prevented by the water stopping rib.
[0018]
Moreover, the electrical junction box according to claim 3 of the present invention is the electrical junction box according to claim 1 or 2,
The waterproof slit-forming rib is positioned so that the seal member is fitted between the waterproof slit-formed ribs at a predetermined compression rate, and when the seal member is fitted, the upper end of the seal member is The height is low.
[0019]
The seal member further protruding from the upper end of the waterproof slit forming rib is compressed at the bottom of the upper case when the upper case is fitted to the lower case, and sealing performance can be secured even at this portion.
[0020]
Moreover, the electrical junction box according to claim 4 of the present invention is the electrical junction box according to any one of claims 1 to 3,
In addition to the drainage hole, a further drainage hole is provided on the opposite side with respect to the waterproof slit and in the vicinity of the waterproof slit.
Drain holes are formed in the vicinity of both sides of the waterproof slit. That is, drainage holes are formed on both sides of the sealing member of the heat radiating plate fitted in the waterproof slit, and most of the water sealed by the waterproof seal part is drained from one drainage hole. Even if moisture enters beyond the seal portion, this moisture is drained from the other drain hole.
Moreover, the electrical junction box according to claim 5 of the present invention is the electrical junction box according to claim 4 ,
In addition to the gap portion according to claim 1, a further gap portion is provided on the opposite side with respect to the waterproof slit and in the vicinity of the waterproof slit, and the further drainage hole according to claim 3 is provided in the further gap portion. Is formed.
[0021]
Since there are gaps in the vicinity of both sides of the waterproof slit, the water on the heat dissipation plate heat sink side is collected and drained from the waterproof seal part, and the water transferred to the heat sink plate heat sink side from this waterproof seal part Accumulate and drain in the gap. Accordingly, the water that is transmitted between the heat radiating plate and the ribs due to the capillary phenomenon and enters the electric junction box is effectively drained.
[0022]
Moreover, the electrical junction box according to claim 6 of the present invention is the electrical junction box according to claim 4 or 5 ,
An electrical component side with respect to the heat dissipation plate than said two drain holes further addition to the two drain holes, and
A new drain hole is provided in the vicinity of the heat radiating plate.
[0023]
It is not drained by the two drain holes, but drains water that has been transferred to the heat absorbing part side of the heat radiating plate, that is, the vicinity of the connecting side between the electric part and the heat radiating plate, before reaching the connecting part between the electric part and the heat radiating plate, Prevent short circuit of electrical circuit due to moisture adhesion.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an electrical junction box 1 according to an embodiment of the present invention will be described with reference to the drawings.
[0025]
As shown in FIG. 1, an electrical junction box 1 according to an embodiment of the present invention has a resin lower case 10, a board assembly 21 mounted inside the lower case, and one end portion connected to the board assembly 21. The other end is provided with a heat radiating plate 30 led out from the lower case 10 to the outside. The electrical connection box 1 includes a bus bar 22, a housing 41, a fuse 23, and an upper case 42 having the same configuration as that of the conventional electrical connection box 5 shown in FIG.
[0026]
The bus bar 22 is electrically connected to the substrate assembly 21 and constitutes a plurality of electric circuits inside the electric connection box. The housing 41 is interposed between the lower case 10 and the upper case 42, and a terminal of the board assembly 21 protrudes from a part of the housing 41. Each fuse 23 is attached to this terminal. That is, the fuse 23 is mounted on the housing 41 for each independent electric circuit, and plays a role of protecting each electric circuit and electric devices connected thereto from overcurrent.
[0027]
A large number of actuator driving relays 24 (see FIG. 1) are mounted on both side surfaces of the substrate assembly 21. A large number of the relays 24 are mounted in high density in accordance with the recent complication of the in-vehicle electric circuit. The heat generated from the relay 24, which is a heat generating electrical component, is radiated to the outside of the electrical junction box through the heat radiating plate 30 without being stored between the lower case 10 and the housing 41.
[0028]
The heat radiating plate itself has the same configuration as the above-described conventional heat radiating plate 80 except that it includes a waterproof seal portion 31 described later. That is, the heat radiating plate 30 is a so-called power plate, and is a flat plate-like heat pipe. One of the two aluminum plates is embossed by pressing and is joined to the other flat plate by brazing. The space formed by embossing is filled with a liquid for heat transport.
[0029]
Then, one end both surfaces (both end surfaces on the inner side of the electric junction box) of the heat radiating plate 30 are fixed to the substrate assembly 21 to form a heat absorbing portion 30a (see FIG. 1), and the other end is led out of the electric junction box 1. 5 is fixed to a vehicle panel P shown in FIG. 5 via a fastener such as a bolt to form a heat radiating portion 30b, and heat is radiated from the heat radiating portion to the vehicle panel P or an external atmosphere.
[0030]
As shown in FIG. 1, the heat radiating plate 30 has a bent portion 30c formed in the vicinity of the heat absorbing portion 30a, and is led out from the lower case 10 obliquely outward toward the heat radiating portion 30b. Further, in the vicinity of the bent portion 30c, a sheet-like (band-like) urethane resin surrounds the periphery of the heat radiating plate and forms a waterproof seal portion 31 on the heat radiating portion side.
[0031]
On the other hand, the lower case 10 to which the heat radiating plate 30 is assembled is made of a resin material having excellent heat resistance such as nylon. A plurality of ribs 10r are formed in the heat dissipation plate lead-out portion of the lower case 10 in the vertical and horizontal directions. Further, as shown in detail in FIG. 2, a part of the ribs 10r are arranged to face each other at a predetermined interval at a position corresponding to the waterproof seal portion 31 of the heat radiating plate, and these ribs constitute seal forming ribs 11a and 11b. is doing. The groove portion formed by the seal forming ribs constitutes a fitting portion with the heat radiating plate as the waterproof slit 11. The seal forming ribs 11 a and 11 b are formed obliquely with respect to the edge in the vicinity of the edge of the lower case 10, and the contact length with the waterproof seal portion 31 of the heat radiating plate, that is, the waterproof slit 11 and the waterproof seal portion 31. The creepage distance of the close contact portion is as long as possible.
[0032]
Further, the interval between the seal forming ribs 11a and 11b has such a dimension that the seal member surrounded by the heat radiating plate 30 is fitted in a compressed state to some extent. As an example, this compression rate is about 70% compared to the plate thickness of the original seal member. If the dimension of the seal forming ribs 11a and 11b is determined so as to compress to this extent, the waterproof slit interval maintains the liquid tightness of this portion by the elasticity of the seal member 31 even if the lower case itself thermally expands. Enough. As shown in FIG. 2, the height of the seal forming ribs 11a and 11b has a height that is slightly lower than the upper end of the waterproof seal portion when the heat radiating plate 30 is fitted into the waterproof slit 11. is doing. As a result, the waterproof seal portion 31 further protruding from the upper end portions of the seal forming ribs 11a and 11b is compressed at the bottom portion of the housing 41 when the housing 41 is fitted to the lower case 10, and the sealing performance is secured even in this portion. be able to.
[0033]
Then, the structure of the seal | sticker exit clearance gap part 12 which is an enlarged clearance gap part is demonstrated.
[0034]
One of the enlarged gap portions is formed as a seal outlet gap portion 12 adjacent to the inside of the lower case of the seal forming ribs 11a and 11b. The seal exit gap 12 intersects the extended ribs 12a and 12b that are formed so as to be spaced apart from the seal forming ribs 11a and 11b, and the extended ribs 12a and 12b. It is defined by water-stopping ribs 12c and 12d that are close to each other at a fixed angle with respect to 30. In addition, the edge part of the water stop rib 12c, 12d is adjoining over the whole width direction of the heat sink plate 30 fitted to the lower case 10, and repels the momentum of the water | moisture content which permeated along the surface of the heat sink plate 30, Further intrusion into the lower case 10 is prevented. Further, it also serves to stop the movement of moisture entering along the heat dissipation plate 30 due to the capillary phenomenon.
[0035]
Subsequently, the drain holes 13 to 15 formed in the lower case 10 will be described.
[0036]
Three drain holes are formed in the lower case of the electrical junction box according to the present embodiment.
[0037]
As shown in FIG. 1 again, the first drain hole 13 is formed at the bottom of the lower case on the outer side (heat radiation part side) of the waterproof seal part 31 of the heat radiation plate 30. The drain hole 13 is formed in a lower portion of a seal inlet gap portion 16 defined by a rib 13a bent at a certain angle from one seal forming rib 11a and a heat radiating plate 30. By having the drain hole 13 at this position, it is possible to drain water from the drain hole 13 that is prevented from entering by the waterproof seal part 31 and accumulated in the seal inlet gap part 16.
[0038]
The second drain hole 14 is formed at the bottom of the seal outlet gap 12. In addition, the bottom part said here is a part located in the downward direction of the vertical direction when the electric junction box 1 is attached to the vehicle body panel P which is an attachment object, and the moisture guided downward by the action of gravity is most efficient. It is a position that can drain well. Moisture accumulated in the seal exit gap 12 is drained from the drain hole 14 by the water stop ribs 12c and 12d (see FIG. 2).
[0039]
The third drain hole 15 is formed in the vicinity of the connection portion between the heat radiating plate 30 and the substrate assembly inside the lower case. Specifically, as shown in FIG. 3 (which is a cross section AA in FIG. 1), the bottom of the lower case 10 extends further downward from the lower end portion 30d of the heat radiating plate indicated by a two-dot chain line in the drawing. And a drain hole 15 is formed at the lower end thereof. Note that the arrows in the figure indicate the paths through which the water W transmitted through the lower portion 30d of the heat radiating plate is discharged from the drain holes 15 before entering the substrate assembly 21 accommodated in the lower case 10.
[0040]
Then, the effect | action of this electrical junction box 1 is demonstrated.
[0041]
Rainwater splashes in the engine room of the vehicle equipped with the electrical junction box 1, and when this rainwater falls on the electrical junction box 1, moisture will enter the lower case through the waterproof plate lead-out portion of the electrical junction box 1. And However, first, moisture entry is prevented by the waterproof seal portion 31, and most of the moisture accumulates in the seal inlet gap portion 16. The water accumulated here is discharged through the first drain hole 13. That is, most of the water that is going to enter the waterproof seal portion 31 is drained from the first drain hole 13.
[0042]
Subsequently, even if water that has not been drained through the first drain hole 13 remains, that is, the seal exit ribs are transmitted through a slight gap between the seal forming ribs 11a and 11b and the heat radiating plate 30 by capillary action. Even if a part of the moisture reaches 12, the further movement of the moisture along the heat radiating plate 30 is blocked by the water stop ribs 12c and 12d. Therefore, for example, even if the rain water is sprinkled to the outside of the electrical junction box, and even if moisture enters this portion, the water stopping ribs 12c and 12d cause the ingress of the water to enter, and the moisture to the substrate assembly 21 side further increases. Intrusion is prevented. That is, the moisture flows down below the water stop ribs 12 c and 12 d and is drained from the drain hole 14 of the seal outlet gap 12.
[0043]
Even if water is not drained through the second drain hole 14, the moisture is drained from the third drain hole 15 shown in FIGS. 1 and 3 before reaching the substrate assembly 21 inside the lower case. (See the arrow in FIG. 3 above). That is, all of the moisture that enters the electrical junction box along the heat dissipation plate 30 from the outside of the electrical junction box is drained from the drain holes 13 to 15 described above.
[0044]
In the above-described embodiment, the material of the waterproof seal portion is urethane resin, but is not necessarily limited thereto. Therefore, any material having excellent water resistance and elasticity such as synthetic rubber can be used.
[0045]
In addition, as in the above-described embodiment, only the lower case 10 does not mainly hold the heat radiating plate lead-out portion liquid-tightly. For example, the lower half of the heat radiating plate 30 is liquid-tightly held and the upper half of the upper case is liquid-tight. You may make it hold tightly.
[0046]
Furthermore, the water stop rib is not formed only in the seal outlet gap portion 12 having the second drain hole 14 as in the above-described embodiment, but may be provided in a portion having another drain hole. good.
[0047]
As described above, the electrical junction box 1 according to the present invention reliably prevents moisture from entering the lower case from the heat radiating plate 30. Therefore, it is possible to avoid a short circuit of the electric circuit of the board assembly 21 inside the electric junction box due to moisture ingress, and the original function of the electric junction box can be maintained over a long period of time. That is, the electrical junction box according to the present invention is not simply an electrical junction box provided with a drainage channel or a drainage hole, but a plurality of waterproofing measures cooperate to produce an effect that is more than a simple combination of each. The effect is remarkably improved as compared with the conventional electric junction box.
[0048]
【The invention's effect】
As described above, the electrical junction box according to the present invention prevents moisture from entering the electrical junction box along the creeping surface of the heat radiating plate through the waterproof seal portion that is in close contact with a part of the waterproof slit. be able to. Further, it is possible to prevent the moisture that has entered through the capillary phenomenon through the gap between the waterproof slit and the heat radiating plate from entering further into the electric junction box through the enlarged gap portion. And the water | moisture content collected in this clearance gap part can be discharged | emitted outside the electrical junction box through the drainage hole formed in the perpendicular direction downward direction of the clearance gap part.
Further, by forming a waterproof slit with such ribs, the electrical junction box itself can be reduced in size and weight.
[0049]
In the electrical junction box according to claim 2 of the present invention, the gap portion is constituted by the gap portion forming rib, so that the electrical junction box itself can be reduced in size and weight. In addition, by forming a part of the gap forming rib as a water stop rib, it is possible to prevent moisture from entering along the creeping surface of the heat radiating plate.
[0050]
In the electrical junction box according to claim 3 of the present invention, the waterproof slit forming rib is positioned so that the seal member is fitted to the fitting portion at a predetermined compression rate, and the seal member is fitted. The seal member has a height that is lower than the upper end of the seal member, so that the seal member further protruding from the upper end of the waterproof slit-forming rib can be removed when the upper case is fitted to the lower case. It is compressed at the bottom part of this, and a sealing property can be ensured also in this part.
[0051]
The electric connection box according to claim 4 of the present invention, the drainage holes in the vicinity of the waterproof slit sides are formed. That is, drainage holes are formed on both sides of the waterproof seal part of the heat radiating plate fitted in the waterproof slit, and most of the water sealed by the waterproof seal part is drained from one drainage hole, Even if water enters the waterproof seal part, this water is drained from the other drain hole.
In addition, since the electrical junction box according to claim 5 of the present invention is provided with a gap in the vicinity of both sides of the waterproof slit, the water on the heat radiating plate radiating side is collected and drained with respect to the waterproof seal part, Moisture transmitted to the heat radiating plate heat absorption side with respect to the waterproof seal portion can also be collected and drained in this gap portion. Therefore, it is possible to effectively drain water that is transmitted between the heat radiating plate and the ribs due to the capillary phenomenon and enters the electric junction box.
[0052]
In addition, the electrical junction box according to claim 6 of the present invention is not drained by the two drain holes, and the moisture transmitted to the heat absorbing portion side of the heat radiating plate, that is, the vicinity of the connecting side between the electric component and the heat radiating plate is transferred. It drains before reaching the connection part between the electrical component and the heat radiating plate, thereby preventing a short circuit of the electrical circuit due to moisture adhesion.
[Brief description of the drawings]
FIG. 1 is a plan view showing a lower case of an electrical junction box according to an embodiment of the present invention, with a substrate assembly and a heat radiating plate.
2 is an enlarged perspective view showing a heat radiating plate lead-out portion in FIG. 1. FIG.
3 is a cross-sectional view taken along the line AA in FIG. 1, showing a third drain hole formed in the lower case of FIG. 1. FIG.
FIG. 4 is an exploded perspective view showing configurations of a conventional electrical junction box and an electrical junction box (excluding a lower case) according to the present invention.
FIG. 5 is a perspective view showing a conventional electrical junction box and an electrical junction box according to the present invention mounted on a panel of a vehicle body.
FIG. 6 is a plan view showing a lower case of a conventional electric junction box with a substrate assembly and a heat radiating plate.
[Explanation of symbols]
1,5 Electrical junction box 10 Lower case 10r Rib 11 Waterproof slit 11a, 11b Seal forming rib 12 Seal outlet gap 12a, 12b Extended rib 12c, 12d Water stop rib 13 First drain hole 14 Second drain hole 15 3 Drain hole 16 Seal inlet clearance 21 Substrate assembly 22 Bus bar 23 Fuse 24 Relay 30 Heat dissipation plate 30a Heat absorption portion 30b Heat dissipation portion 30c Bending portion 30d Heat dissipation plate lower end 31 Waterproof seal portion 41 Housing 42 Upper case 51 Housing 52 Upper case 61 Substrate assembly 62 Bus bar 63 Fuse 70 Lower case 71 Ribs 71a, 71b Waterproof slit 80 Heat radiation plate P Panel W Moisture

Claims (6)

A housing with an upper case and a lower case;
A wiring body housed in the housing;
An electrical component housed in the housing and electrically connected to the wiring body;
In an electrical junction box having a heat radiating plate that is led out from the inside of the housing to the outside of the housing and dissipates heat of the electrical component to the outside of the housing,
The housing is equipped with a waterproof slit,
The waterproof slit is composed of a pair of opposing waterproof slit forming ribs formed obliquely with respect to the edge of the lower case of the housing,
A part of the heat dissipation plate is fitted between the waterproof slit forming ribs,
A part of the heat radiating plate is surrounded by a sealing member so as to be elastically adhered to the waterproof slit, and the casing is adjacent to the waterproof slit and is spaced from the waterproof slit around the heat radiating plate. A gap portion that is further enlarged is formed, and a drainage hole is formed in the gap portion at a position that is vertically downward in a state in which the electrical junction box is attached to an attachment target. Electrical junction box. Before SL gap portion is constituted by a gap portion formed ribs,
A part of the gap portion forming rib forms an angle with the heat radiating plate, and an end portion of the gap portion forming rib is close to the heat radiating plate to form a water stop rib, The electrical junction box according to claim 1. The waterproof slit-forming rib is positioned so that the seal member is fitted between the waterproof slit-formed ribs at a predetermined compression rate, and when the seal member is fitted, the upper end of the seal member is The electrical junction box according to claim 2, wherein the electrical junction box has a height that is lowered. Characterized in that additional drainage holes in addition to the drainage hole is provided to a side opposite to the vicinity of the waterproof slit with respect to said waterproof slits, the electrical connection according to any one of claims 1 to 3 box. In addition to the gap portion according to claim 1, a further gap portion is provided on the opposite side with respect to the waterproof slit and in the vicinity of the waterproof slit, and the further drainage hole according to claim 4 is provided in the further gap portion. characterized in that it is formed, the electric connection box according to 請 Motomeko 4. In addition to the two drain holes, a new drain hole is provided on the electrical component side with respect to the heat radiating plate than the two drain holes, and in the vicinity of the heat radiating plate.
The electrical junction box according to claim 4 or 5, characterized by the above-mentioned.

Images