JP2007259652A - Electric joint box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the waterproofness of a storage of a power distributor to prevent a connector fixture of the power distributor from being watered. <P>SOLUTION: The electric joint box arranged in an engine room of an automobile includes a case body to which electrical components are attached, a lower cover attached to the case body, the power distributor arranged on one side of the case body with its lower side joined to a power distributor accommodation part provided at the lower cover, and an upper cover covering the power distributor and the case body. The lower cover has a wire draw-out space between the outside wall of the lower cover and the side wall of the power distributor accommodation part. A water ingress prevention eave protruding on the wire draw-out space side is provided at the upper end of the side wall of the power distributor accommodation part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric junction box mounted on an automobile, and in particular, a power distributor that prevents high-pressure washing water or the like from entering a wire outlet provided in a lower cover of the electric junction box and accommodates the electric junction box in the electric junction box. This prevents water from getting wet.

In recent years, with the increase in functionality of automobiles, the number of in-vehicle electrical components has increased rapidly, and the number of electrical circuit systems in the vehicle has also increased, mounting relays etc. on a printed circuit board, mounting a bus bar on one side, and integrating a heat sink In some cases, a fixed power distributor, electronic control unit, or the like is incorporated in the electrical junction box.
When the power distributor etc. are assembled in the electrical junction box, the power distributor is placed from the lower cover side to the case body on the side of the junction block consisting of a laminated body of bus bars and insulating plates, etc. In many cases, the connector for connecting the wire harness is positioned at the lower end portion.

  When the electrical junction box having the above-described configuration is mounted in an engine room of an automobile, a waterproof measure is very important because the engine room is a wet area. Since the lower cover is provided with an electric wire outlet through which the wire harness connected to the junction block is pulled out, high-pressure washing water can easily enter from the electric outlet during car washing. When water is generated in the lower cover, there is a problem that the connector located near the bottom surface of the lower cover is likely to be wetted.

Conventionally, various proposals have been made as waterproofing measures for the electrical junction box mounted in such a flooded area. For example, in the electrical junction box disclosed in Japanese Patent Application Laid-Open No. 2000-349452 (Patent Document 1), as shown in FIG. 8, the housing space between the upper case 1 and the lower case 2 is defined as the first housing portion 3 and the second housing. A waterproof wall 5 divided into a part 4 is erected from the lower case 2, an ECU case 6 is accommodated in the first accommodating part 3, and a relay block 7 is accommodated in the second accommodating part 4. A connector mounting portion 8 is provided on the lower case 2 side of the ECU case 6, and an electric wire outlet 2 a through which an electric wire connected to the relay block 7 is inserted in the lower case 2 on the second housing portion 4 side. I have.
Although the upper end edge 5a of the waterproof wall 5 has an opening 5b above the connector mounting portion 8, the water is rebounded by the waterproof wall 5 even if water enters from the wire outlet 2a. The connector mounting portion 8 is prevented from getting wet.

  In the above configuration, there is a low possibility that water that has entered from the electric wire outlet 2a directly enters the first housing 3. However, when high-pressure water such as high-pressure washing is applied, the high-pressure water that has entered from the wire outlet 2 a bounces back to the bottom surface of the relay block 7 and the lower case 2, and the first through the opening 5 b above the upper edge 5 a of the waterproof wall 5. The connector mounting portion 8 may get wet, and the connector mounting portion 8 cannot be reliably waterproofed.

Japanese Patent Laid-Open No. 2000-349452

  The present invention has been made in view of the above problems, and when an electric junction box with a power distributor assembled is mounted in an engine room in a wet area, to the connector of the power distributor located near the bottom of the lower cover. The issue is to ensure prevention of flooding.

In order to solve the above problems, the present invention is an electrical junction box disposed in an engine room of an automobile,
A case main body to which electrical components are mounted, a lower cover attached to the case main body, a power distributor disposed on one side of the case main body by coupling a lower side to a power distributor accommodating portion provided on the lower cover, With an upper cover that covers the top of the power distributor and case body,
The lower cover is provided with a wire lead-out space between an outer wall thereof and the side wall of the power distributor accommodating portion, and a water blocking block eaves portion projecting toward the wire lead-out space side is provided at the upper end of the side wall of the power distributor accommodating portion. An electrical junction box characterized by being provided is provided.

  With the above configuration, even if water enters the wire lead-out space due to high-pressure washing or the like, water can be prevented from entering the power distributor housing portion by the side wall of the power distributor housing portion. Further, since water that attempts to get over the upper end of the side wall of the power distributor housing portion is blocked by the eaves portion, water does not enter the power distributor housing portion, so that water can be applied to the connector mounting portion of the power distributor. Can be reliably prevented.

  If the eaves portion is provided in the lower cover formed by the mold, a die punching hole is required in the mold, and therefore, a slit-shaped die opening is formed on the bottom surface of the lower cover facing the eaves portion. Since the water blocked by the eaves portion is drained from the die opening, the waterproof property for the power distributor housing portion can be enhanced.

  Furthermore, since the eaves portion is formed on the side wall of the power distributor housing portion to form a waterproof wall, it is not necessary to newly form the waterproof wall, the number of parts is not increased, and the cost can be suppressed. Space efficiency is good because the space of the drawer space does not become narrow.

  The lower end surface of the side wall of the case main body is continuously arranged on the upper end surface of the side wall of the power distributor housing portion provided with the eaves portion, and the eaves portion is inclined upward so as to cover the gap between the side walls arranged continuously. It is preferable to make it protrude toward.

  With the above configuration, since the eaves portion is disposed so as to cover the gap, water from any direction to enter the gap can be surely blocked by the eaves portion, and the power distributor is accommodated. It is possible to prevent water from entering the part.

  An electric wire outlet is provided on the outer wall of the lower cover surrounding the electric wire extraction space, and the side wall of the power distributor accommodating portion facing the electric wire outlet is provided with a lower end of the side wall from an eave portion protruding from the upper end. It is preferable to provide the rib which comprises the groove | channel for water immersion fall guides of an up-down direction toward.

With the above configuration, even if water that has entered from the wire outlet bounces back at the bottom of the lower cover and tries to get over the upper end of the side wall, the eaves portion shuts off the water, so water can surely enter the power distributor housing portion. Can be prevented. Furthermore, since the water blocked by the eaves portion is transmitted through the groove for the submerged drop guide and drained from the die opening formed in the lower cover, the waterproof property to the power distributor housing portion can be enhanced.
Moreover, since the rib is provided from the eaves portion toward the lower end of the side wall, the strength of the side wall does not decrease even if the groove is provided.

  As described above, according to the present invention, even if water enters the wire lead-out space due to high-pressure washing or the like, water that attempts to get over the upper end of the side wall of the power distributor housing is blocked by the eaves. In addition, water can be prevented from entering the connector mounting portion of the power distributor without water entering the power distributor housing portion, and the waterproofness of the power distributor housing portion can be improved.

Embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of the present invention. As shown in FIG. 1, an electrical junction box 10 of the present invention is attached to a case main body 11 to which electrical components are mounted and to the case main body 11 from below. A lower cover 12, a power distributor 20 and a relay box 30 disposed on one side of the case body 11, and an upper cover 13 that covers the power distributor 20, the case body 11, and the relay box 30.

  As shown in FIGS. 2A and 2B, the lower cover 12 includes a power distributor accommodating portion 14 for accommodating the power distributor 20, and a side wall 14a of the power distributor accommodating portion 14 is provided upright from the lower cover bottom surface 12a. In addition, the inner surface 12b of the lower cover 12 is continuous.

  When the lower cover 12 and the case main body 11 are assembled, as shown in FIG. 3B, the upper end surface 14b of the side wall 14a of the power distributor accommodating portion 14 and the lower end surface 11b of the side wall 11a of the case main body 11 are continuously arranged. A gap S1 is formed between these continuously arranged side walls. The other side wall 14c facing the side wall 14a of the power distributor accommodating portion 14 is provided with a notch 14d in which the side wall 14c is partially cut out.

  A wire lead-out space S2 is provided between the side wall 14a of the power distributor accommodating portion 14 and the outer wall 12c of the lower cover 12, and an opening 12d is provided at the lower end of the wire lead-out space S2, and the lower end opening 12d. Is provided with a semi-cylindrical wire lead-out portion 12e-1. As shown in FIG. 4, it becomes a cylindrical wire lead-out part 12e by combining with the semi-cylindrical wire lead-out part 12e-2 provided in the case main body 11.

On the upper end surface of the side wall 14a of the power distributor accommodating portion 14, as shown in FIG. 3 (B), an eaves portion 14e for blocking water is provided on the wire lead-out space S2 side so as to protrude obliquely upward. The eaves part 14e is disposed so as to cover the gap S1. On the bottom surface 12a of the lower cover 12, a slit-shaped punching opening 12f when formed with a mold is formed at a position facing the eaves portion 14e.
An electric wire outlet 12g is provided in the middle of the outer wall 12c of the lower case, and a clamp mounting portion 12h projects outward from the lower end of the electric wire outlet 12g.

As shown in FIGS. 3B and 4, the wires w1 and w2 connected to the fuses and relays of the case body 11 are inserted through the wire lead-out space S2, and the wire lead-out port 12g and the wire lead-out portion. It is drawn from 12e.
While the clamp 40 provided on the electric wire w1 drawn out from the electric wire outlet 12g is locked to the clamp mounting portion 12h provided in the electric wire outlet 12g, the electric wire w1 is fixed to the lower cover 12, The electric wire w2 drawn out from the wire lead-out portion 12e is taped and fixed to the wire lead-out portion 12e with a tape T.

  As shown in FIG. 3B, the power distributor 20 has a relay 22 mounted on one side of the printed circuit board 21 and a part of the relay terminal is connected to the printed conductor 21. A bus bar 23 punched into a predetermined circuit pattern is fixed on the other surface side. Some of the terminals of the relay are electrically connected by passing through the insulating substrate of the printed circuit board 21 and soldering to the bus bar 23. A metal heat dissipating material 24 is attached to the outer surface side of the bus bar 23 via an insulating sheet.

  As shown in FIG. 3A, the power distributor 20 has one side surface on the heat radiating material 24 side as the outside, is placed vertically with respect to the case body 11, and the upper cover 20 is covered with the upper portion 20a. One side of the lower part 20 b of the power distributor 20 is disposed in the cutout part 14 d of the lower cover 12 and is coupled to the power distributor accommodating part 14. At the lower end of the power distributor 20, there is provided a connector mounting portion 25 to which a connector connected to the electric wire w3 routed in the automobile is mounted.

Next, the path of water that attempts to enter the gap S1 will be described. The arrows in FIGS. 3B and 4 indicate the water intrusion route.
As shown in FIG. 3B, even if water that has entered the wire lead-out space S2 from the wire lead-out port 12g of the lower cover 12 bounces back into the lower cover bottom surface 12a and enters the gap S1, it is blocked by the eaves portion 14e. Then, it falls in the direction of the dotted arrow, and the dropped water is drained out of the lower cover 12 through the die-cut opening 12f.

  As shown in FIG. 4, even if water that has entered the wire lead-out space S2 from the wire lead-out portion 12e of the lower cover 12 attempts to enter the gap S1, it is blocked by the eaves portion 14e and falls in the direction of the dotted arrow. The dropped water is drained out of the lower cover 12 through the die opening 12f.

  With the above configuration, even if water enters from the lower end opening 12d of the wire lead-out space S2 due to high-pressure washing or the like, the side wall 14a of the power distributor accommodating portion 14 prevents water from entering the power distributor accommodating portion 14. can do. Further, since the water to enter the gap S1 is blocked by the eaves part 14e, the water is not allowed to enter the power distributor housing part 14, and the connector mounting part 25 of the power distributor 20 is not wetted. Can be prevented.

Further, even if water enters from the wire outlet 12g facing the side wall 14a of the power distributor accommodating portion 14 and rebounds to the lower cover bottom surface 12a to enter the gap S1, it can be blocked by the eaves portion 14e.
Therefore, no matter which direction water enters the wire lead-out space S2, water can be prevented from entering the power distributor accommodating portion 14, and the connector mounting portion 25 of the power distributor 20 can be reliably covered with water. Can be prevented.
Further, a die-cut opening 12f is formed in the lower cover bottom surface 12a facing the eaves portion 14e, and water blocked by the eaves portion 14e is drained from the die-release opening 12f. Waterproofness can be improved.

5 to 7 show a second embodiment of the present invention, and arrows in FIGS. 6 and 7 indicate water intrusion paths.
On the side wall 14 a ′ of the power distributor housing 14 facing the wire outlet 12 g, the submerged drop guide in the vertical direction extends from the eaves 14 e ′ protruding from the upper end of the side wall 14 a ′ toward the lower end of the side wall. A rib 14g constituting the groove 14f is provided, and a die opening 12f is formed in the lower cover bottom surface 12a facing the eaves portion 14e 'when it is molded with a mold.

  As shown in FIGS. 6 and 7, when water that has entered the wire lead-out space S2 from the wire lead-out portion 12e and the wire lead-out port 12g tries to enter the gap S1, it is blocked by the eaves portion 14e ′. The water that has been transferred is transmitted through the groove 14f in the direction of the dotted arrow, and is drained from the die opening 12f.

With the above configuration, since the groove 14f is provided in the eaves part 14e ', water blocked by the eaves part 14e' is surely drained, preventing water from entering the power distributor housing part 14, and is waterproof. Can be increased. Further, since the rib 14g is provided on the side wall 14a ', the strength of the side wall 14a' does not decrease even if the groove 14f is provided.
Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

It is a disassembled perspective view which shows the electrical junction box which concerns on 1st Embodiment of this invention. It is a figure of the state which assembled | attached the lower cover and power distributor of FIG. 1, (A) is a perspective view, (B) is the sectional view on the AA line of (A). (A) is the BB sectional drawing of FIG. 1, (B) is drawing which expanded the principal part of (A). It is CC sectional view taken on the line of FIG. 1, and is the figure which expanded the principal part. It is a figure which shows 2nd Embodiment and is a perspective view of the state which assembled | attached the lower cover and the power distributor. It is a figure which shows 2nd Embodiment and is sectional drawing to which the principal part was expanded. It is a figure which shows 2nd Embodiment and is sectional drawing to which the principal part was expanded. It is a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electrical junction box 11 Case main body 11a Side wall 11b Lower end surface 12 Lower cover 12c Outer side wall 12e Electric wire extraction part 13 Upper cover 20 Power distributor 20b Lower side part 14 Power distributor accommodating part 14a Side wall 14b Upper end face 14e Eave part 14f Groove 14g Rib S1 Gap S2 Wire drawing space

Claims (3)

An electrical junction box arranged in the engine room of a car,
A case main body to which electrical components are mounted, a lower cover attached to the case main body, a power distributor disposed on one side of the case main body by coupling a lower side to a power distributor accommodating portion provided on the lower cover, With an upper cover that covers the top of the power distributor and case body,
The lower cover is provided with a wire lead-out space between an outer wall thereof and the side wall of the power distributor accommodating portion, and a water blocking block eaves portion projecting toward the wire lead-out space side is provided at the upper end of the side wall of the power distributor accommodating portion. An electrical junction box characterized by being provided.   The lower end surface of the side wall of the case main body is continuously arranged on the upper end surface of the side wall of the power distributor housing portion provided with the eaves portion, and the eaves portion is inclined upward so as to cover the gap between the side walls arranged continuously. The electrical junction box according to claim 1, wherein the electrical junction box is projected toward.   An electric wire outlet is provided on the outer wall of the lower cover surrounding the electric wire extraction space, and the side wall of the power distributor accommodating portion facing the electric wire outlet is provided with a lower end of the side wall from an eave portion protruding from the upper end. The electrical junction box according to claim 1 or 2, wherein a rib constituting a groove for a submerged drop guide in the vertical direction is provided.

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