JP2022017072A - Electric connection box - Google Patents

Abstract

To provide an electric connection box which can prevent water from stagnating in a recessed portion of a stationary leg.SOLUTION: The stationary leg has: a rib 21 for reinforcement; and a recessed portion 22 divided by the rib 21. In a bottom 30 of the recessed portion 22, a surface in a side of the rib 21 is a first surface 31, and a back surface of the first surface 31 is a second surface 32. The bottom 30 has: a through hole 33 passing through from the first surface 31 to the second surface 32; and an inclined plane 34 provided around the through hole 33 in the first surface 31 and having a gradient going down toward the through hole 33.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to electrical junction boxes.

For example, Patent Document 1 discloses a conventional electrical connection box. This electrical connection box is provided with fixing legs for fixing the box body to the vehicle body side. The fixed legs extend from the box body and are fixed to the vehicle body. The fixed legs need to have a certain degree of rigidity in order to stably support the box body. Therefore, the fixing legs of the above-mentioned electrical connection box are provided with reinforcing ribs.

Japanese Unexamined Patent Publication No. 2020-39194

In the above-mentioned electrical connection box, the fixing legs are formed with recesses partitioned by ribs. For this reason, when the electrical connection box is installed in a place exposed to water, there is a problem that water collects in the recess formed by the rib of the fixed leg.

Therefore, it is an object of the present invention to provide an electric connection box capable of suppressing the retention of water in the recesses of the fixed legs.

The electrical connection box of the present disclosure is an electrical connection box including a box body and fixed legs extending from the box body and fixed to an attachment target, wherein the fixed legs have ribs for reinforcement. It has a recess partitioned by the rib, and at the bottom of the recess, the surface on the rib side is the first surface, the back surface of the first surface is the second surface, and the bottom is the first surface. It has a through hole penetrating from the second surface to the second surface, and an inclined surface provided at least a part around the through hole on the first surface and having a slope downward toward the through hole.

According to the present disclosure, it is possible to provide an electrical connection box capable of suppressing the retention of water in the recesses of the fixed legs.

FIG. 1 is a perspective view of the electrical connection box of the embodiment. FIG. 2 is a plan view of a fixed leg in an electrical connection box of the same form. FIG. 3 is a sectional view taken along line 3-3 in FIG. FIG. 4 is an enlarged cross-sectional view showing a part of the fixed leg in the electric connection box of the same form. FIG. 5 is an enlarged cross-sectional perspective view showing a part of the fixed leg in the electric connection box of the same form.

[Explanation of Embodiments of the present disclosure]
First, embodiments of the present disclosure will be listed and described.
The electrical junction box of the present disclosure is
[1] An electrical connection box including a box main body and fixed legs extending from the box main body and fixed to an attachment target, and the fixed legs are partitioned by reinforcing ribs and ribs. In the bottom of the recess, the surface on the rib side is the first surface, the back surface of the first surface is the second surface, and the bottom is from the first surface to the second surface. It has a through hole that penetrates to the above, and an inclined surface that is provided in at least a part around the through hole on the first surface and has a slope that descends toward the through hole.

According to this configuration, in the fixed leg, the water that has entered the recess partitioned by the rib can be discharged to the outside through the through hole provided at the bottom of the recess. In addition, the inclined surface provided around the through hole at the bottom of the recess makes it possible for water adhering to the bottom to flow toward the through hole. Therefore, it is possible to suppress the retention of water in the recesses of the fixed legs.

[2] The thickness of the bottom portion from the inclined surface to the second surface increases toward the upstream side of the inclination of the inclined surface.
According to this configuration, the thickness from the inclined surface to the second surface at the bottom of the recess becomes thicker toward the upstream side of the inclination of the inclined surface. This makes it possible to improve the rigidity at the bottom of the recess.

[3] The inclined surface has a valley-shaped drainage channel provided along the radial direction of the through hole, and the drainage channel is inclined so as to descend toward the through hole.
According to this configuration, at the bottom of the recess, the drainage channel provided on the inclined surface can promote the flow of water toward the through hole on the inclined surface.

[4] The fixing leg has a connecting portion connected to the box body and a fixing portion fixed to the mounting target, and the drainage channel connects the connecting portion and the fixing portion. It is provided along a direction parallel to a virtual straight line.

The fixed leg receives the load of the box body with the fixed portion fixed to the mounting target as a fulcrum. When a valley-shaped drainage channel is provided on the inclined surface of the bottom portion, there is a concern that it may be difficult to secure the rigidity of the bottom portion that can withstand the load of the box body depending on the forming direction of the drainage channel. In this regard, according to this configuration, since the drainage channel is provided along the direction parallel to the virtual straight line connecting the connecting portion and the fixed portion, the box main body is provided with the drainage channel on the inclined surface. It is possible to secure the rigidity of the bottom that can withstand the load of.

[5] The drainage channel provided along the direction parallel to the straight line is used as the first drainage channel, and the inclined surface has a second drainage channel provided along the radial direction of the through hole. However, the second drainage channel is provided along a direction intersecting the straight line.

According to this configuration, at the bottom of the recess, both the first drainage channel and the second drainage channel provided on the inclined surface can further promote the flow of water toward the through hole on the inclined surface.

[Details of Embodiments of the present disclosure]
Specific examples of the electrical junction box of the present disclosure will be described below with reference to the drawings. In each drawing, for convenience of explanation, a part of the configuration may be exaggerated or simplified. In addition, the dimensional ratio of each part may differ in each drawing. Further, the term "parallel" in the present specification includes not only the case of being strictly parallel but also the case of being substantially parallel within the range in which the action and effect in the present embodiment are exhibited. It should be noted that the present invention is not limited to the following examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The electrical connection box 10 shown in FIG. 1 is arranged between, for example, a power source in a vehicle and various electrical components, and supplies electric power of the power source to the various electrical components.
The electrical connection box 10 includes a box body 11 and fixed legs 12 extending from the box body 11. Various electric parts such as relays and fuses are housed in the box body 11. As shown in FIG. 2, the fixed leg 12 connects the mounting target A to which the electrical connection box 10 is mounted and the box body 11. The mounting target A is, for example, a vehicle body panel.

(Structure of fixed legs 12)
Hereinafter, the configuration of the fixed leg 12 will be described with reference to FIGS. 2 to 5. In the drawings, the X-axis in the XYZ axes orthogonal to each other represents the longitudinal direction X of the fixed leg 12, the Y-axis represents the width direction Y of the fixed leg 12, and the Z-axis represents the height direction Z of the fixed leg 12. There is. In the following description, for convenience, one side of the fixed leg 12 in the height direction Z may be expressed as the upper side, and the opposite side may be expressed as the lower side. This does not mean that the electrical connection box 10 is mounted on the vehicle in a posture in which the upper side of the fixed leg 12 in the height direction Z faces toward the sky. That is, the expressions "upper" and "lower" do not limit the mounting posture of the electrical connection box 10 on the vehicle.

As shown in FIGS. 2 and 3, the fixed leg 12 has a connecting portion 13 connected to the box body 11 and a fixing portion 14 fixed to the mounting target A. Most of the fixed legs 12 are made of synthetic resin. Further, the fixed legs 12 are formed by injection molding.

The fixed leg 12 has a long shape that is long in the longitudinal direction X. Specifically, the dimension of the fixed leg 12 in the longitudinal direction X is longer than the maximum dimension of the fixed leg 12 in the width direction Y. The connecting portion 13 is provided, for example, at one end of the fixed leg 12 in the longitudinal direction X. The fixing portion 14 is provided at the other end of the fixing leg 12 in the longitudinal direction X, that is, at the end opposite to the end where the connecting portion 13 is provided.

The fixing portion 14 has, for example, a bolt insertion hole 15. The bolt insertion hole 15 penetrates the fixing portion 14 along the width direction Y of the fixing leg 12, for example. A bolt (not shown) is inserted into the bolt insertion hole 15. The fixing portion 14 is fixed to the mounting target A by fastening the bolt.

The fixing portion 14 has a positioning protrusion 16 that is fitted into a positioning hole (not shown) of the mounting target A. By fitting the positioning protrusion 16 into the positioning hole of the mounting target A, the fixed leg 12 is positioned in the longitudinal direction X and the height direction Z.

(Structure of rib 21 and recess 22)
As shown in FIGS. 2 and 3, the fixed leg 12 has a reinforcing rib 21. Further, the fixed leg 12 has a recess 22 partitioned by a reinforcing rib 21. The fixed leg 12 has an intermediate portion 23 located between the connecting portion 13 and the fixed portion 14 in the longitudinal direction X. The rib 21 and the recess 22 are provided in the intermediate portion 23 of the fixed leg 12.

The fixed leg 12 has a base portion 24 constituting the lower end surface of the intermediate portion 23. The rib 21 extends upward from the base 24.
The rib 21 has, for example, a first wall portion 25 provided along the longitudinal direction X of the fixed leg 12, and a second wall portion 26 provided along the width direction Y of the fixed leg 12. .. A plurality of first wall portions 25 and a plurality of second wall portions 26 are provided. Each first wall portion 25 and each second wall portion 26 extend upward from the base portion 24. A part of the rib 21 is formed in a grid pattern by the first wall portion 25 and the second wall portion 26.

The recess 22 is a portion surrounded on all sides by the first wall portion 25 and the second wall portion 26 of the rib 21. In the fixed leg 12, there are a plurality of recesses 22. Each recess 22 has an opening 27 that opens upward in the height direction Z. The fixed leg 12 is attached, for example, with the opening 27 of the recess 22 facing upward.

As shown in FIGS. 1 and 3, the fixed leg 12 has a guide portion 28 extending downward from the connecting portion 13. The guide portion 28 extends to a lower position of the base portion 24 of the intermediate portion 23.
The guide portion 28 is combined with the main body side guide portion 11a shown in FIG. The guide portion 28 and the main body side guide portion 11a are combined with each other to form a tubular electric wire insertion portion 11b. An electric wire (not shown) connected to an electric component inside the box body 11 is inserted into the electric wire insertion portion 11b. The electric wire is pulled out to the outside of the box main body 11 through the electric wire insertion portion 11b. The electric wire is fixed to the guide portion 28 of the fixed leg 12 by, for example, tape winding.

The guide portion 28 extends diagonally from the connecting portion 13 toward the intermediate portion 23 on the lower side of the fixed leg 12. Therefore, in the molding die of the fixed leg 12, it is necessary to set the drawing direction of the lower die for molding the lower surface of the guide portion 28 and the base portion 24 of the intermediate portion 23 to, for example, the longitudinal direction X orthogonal to the height direction Z. Occurs. Therefore, in the fixed leg 12 of the present embodiment, the opening 27 of the recess 22 cannot be designed to face the guide portion 28 side, that is, the rib 21 cannot be designed to be provided under the base 24, and the opening of the rib 21 and the recess 22 cannot be provided. 27 is designed to face upward in the height direction Z.

As shown in FIGS. 4 and 5, each recess 22 has a bottom portion 30 at the lower end in the height direction Z. The bottom portion 30 is a part of the base portion 24 of the intermediate portion 23. The bottom portion 30 has a surface of the bottom portion 30 on the rib 21 side, that is, a first surface 31 which is an upper surface and a second surface 32 which is a back surface of the first surface 31.

The bottom portion 30 of the recess 22 has a through hole 33 penetrating from the first surface 31 to the second surface 32. The through hole 33 penetrates the bottom portion 30 along the height direction Z, for example. The shape of the through hole 33 seen from the height direction Z is, for example, a circle. Further, the through hole 33 is provided, for example, in the central portion of the bottom portion 30. As a result, the entire outer peripheral edge of the bottom portion 30 is connected to the rib 21, which can contribute to the improvement of the rigidity of the fixed leg 12.

The bottom portion 30 of the recess 22 has an inclined surface 34 on the first surface 31. The inclined surface 34 is provided on the entire circumference of the through hole 33. The inclined surface 34 has a slope descending toward the through hole 33. The through hole 33 and the inclined surface 34 are formed in, for example, each recess 22.

Let T be the thickness of the bottom portion 30 along the height direction Z from the inclined surface 34 to the second surface 32. The thickness T of the bottom portion 30 is thinned at the inner edge portion connected to the through hole 33. The thickness T of the bottom portion 30 increases toward the upstream side of the inclination of the inclined surface 34, that is, toward the outer edge side connected to the rib 21. That is, the inclined surface 34 is formed by increasing the thickness T toward the outer edge portion of the bottom portion 30 connected to the rib 21. The second surface 32 of the bottom portion 30 has a planar shape along the XY plane, for example.

As shown in FIGS. 2, 4 and 5, the inclined surface 34 includes a first drainage channel 35 and a second drainage channel 36. The first drainage channel 35 is formed along the longitudinal direction X of the fixed leg 12. The second drainage channel 36 is formed along the width direction Y of the fixed leg 12. Note that FIG. 4 shows a cross-sectional view cut along the longitudinal direction X at the portion of the first drainage channel 35, and FIG. 5 shows a cross-sectional view along the longitudinal direction X at a position deviated from the first drainage channel 35 in the width direction Y. The cross-sectional view cut out is shown.

The first drainage channel 35 is provided along a direction parallel to a virtual straight line L connecting the connecting portion 13 and the fixing portion 14 shown in FIG. In this embodiment, the straight line L is parallel to the longitudinal direction X of the fixed leg 12. Further, the second drainage channel 36 is provided along a direction intersecting the straight line L.

As shown in FIGS. 4 and 5, the first drainage channel 35 and the second drainage channel 36 are provided alternately in the circumferential direction of the through hole 33, for example, at intervals of 90 degrees. The first drainage channel 35 and the second drainage channel 36 form, for example, a valley shape provided along the radial direction of the through hole 33. That is, the first drainage channel 35 and the second drainage channel 36 are portions where the thickness T becomes thinner in the circumferential direction of the through hole 33. The first drainage channel 35 and the second drainage channel 36 are inclined so as to descend toward the through hole 33.

The operation of this embodiment will be described.
In the fixed leg 12, the water that has entered the recess 22 through the opening 27 is discharged to the outside of the recess 22 through the through hole 33 of the bottom 30. Further, the water adhering to the first surface 31 of the bottom portion 30 flows toward the through hole 33 by the inclined surface 34. Here, the inclined surface 34 has a valley-shaped first drainage channel 35 and a second drainage channel 36 formed along the radial direction of the through hole 33. Therefore, the water adhering to the inclined surface 34 can be allowed to flow into the through hole 33 while being mainly concentrated in the first drainage channel 35 and the second drainage channel 36.

The effect of this embodiment will be described.
(1) The first surface 31 of the bottom portion 30 is provided with an inclined surface 34 having a slope downward toward the through hole 33. According to this configuration, in the fixed leg 12, the water that has entered the recess 22 partitioned by the rib 21 can be discharged to the outside through the through hole 33 provided in the bottom 30 of the recess 22. Further, the inclined surface 34 provided around the through hole 33 of the bottom portion 30 in the recess 22 makes it possible to allow water adhering to the bottom portion 30 to flow toward the through hole 33. Therefore, it is possible to suppress the retention of water in the recess 22 of the fixed leg 12.

(2) The thickness of the bottom portion 30 from the inclined surface 34 to the second surface 32 becomes thicker toward the upstream side of the inclination of the inclined surface 34. According to this configuration, the thickness of the inclined surface 34 to the second surface 32 at the bottom 30 of the recess 22 becomes thicker toward the upstream side of the inclination of the inclined surface 34. This makes it possible to improve the rigidity of the bottom portion 30 of the recess 22.

(3) The inclined surface 34 has a valley-shaped first drainage channel 35 provided along the radial direction of the through hole 33. The first drainage channel 35 is inclined so as to descend toward the through hole 33. According to this configuration, at the bottom 30 of the recess 22, the first drainage channel 35 provided on the inclined surface 34 can promote the flow of water toward the through hole 33 on the inclined surface 34.

(4) The fixed leg 12 has a connecting portion 13 connected to the box body 11 and a fixing portion 14 fixed to the mounting target A. The first drainage channel 35 is provided along a direction parallel to a virtual straight line L connecting the connecting portion 13 and the fixing portion 14.

The fixed leg 12 receives the load of the box body 11 with the fixed portion 14 fixed to the mounting target A as a fulcrum. When a valley-shaped drainage channel is provided on the inclined surface 34 of the bottom portion 30, there is a concern that it may be difficult to secure the rigidity of the bottom portion 30 that can withstand the load of the box body 11 depending on the forming direction of the drainage channel. In this respect, according to this configuration, the first drainage channel 35 is provided along the direction parallel to the virtual straight line L connecting the connecting portion 13 and the fixed portion 14. Therefore, it is possible to secure the rigidity of the bottom portion 30 that can withstand the load of the box body 11 even though the first drainage channel 35 is provided on the inclined surface 34.

(5) The inclined surface 34 has a second drainage channel 36 provided along the radial direction of the through hole 33, and the second drainage channel 36 is provided along the direction intersecting the straight line. .. According to this configuration, both the first drainage channel 35 and the second drainage channel 36 provided on the inclined surface 34 can further promote the flow of water toward the through hole 33 on the inclined surface 34.

(6) The through hole 33 is provided in the central portion of the bottom portion 30. That is, the bottom portion 30 is formed around the entire circumference of the through hole 33. According to this configuration, the entire outer peripheral edge of the bottom portion 30 is connected to the rib 21, which can contribute to the improvement of the rigidity of the fixed leg 12.

This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
In the above embodiment, the through hole 33 is provided in the central portion of the bottom portion 30, but in addition to this, for example, when viewed from the height direction Z, the through hole 33 is formed in the first wall portion 25 and the second wall portion 25 of the rib 21. It may be provided at a position adjacent to at least one of the wall portions 26.

-In the above embodiment, the shape of the through hole 33 seen from the height direction Z is circular, but other than this, for example, it may be elliptical or polygonal.
In the recess 22 of the above embodiment, the first drainage channel 35 at the bottom 30 may be omitted. Further, in the recess 22 of the above embodiment, the second drainage channel 36 of the bottom portion 30 may be omitted. Further, in the recess 22 of the above embodiment, both the first drainage channel 35 and the second drainage channel 36 of the bottom portion 30 may be omitted. When both the first drainage channel 35 and the second drainage channel 36 are omitted, the inclined surface 34 may be formed in, for example, a conical surface.

The inclined surface 34 of the above embodiment is provided all around the through hole 33, but the present invention is not particularly limited, and the inclined surface 34 may be provided partially around the through hole 33.
The number of the first wall portion 25 and the second wall portion 26 and the number of the recesses 22 in the rib 21 are not limited to the above embodiment, and can be appropriately changed according to the configuration of the fixed leg 12. ..

The mounting target A to which the fixed portion 14 of the fixed leg 12 is fixed is not limited to the vehicle body panel, and may be a portion other than the vehicle body panel in the vehicle.

10 Electrical connection box 11 Box body 11a Main body side guide part 11b Wire insertion part 12 Fixed leg 13 Connection part 14 Fixing part 15 Bolt insertion hole 16 Positioning protrusion 21 Rib 22 Recessed part 23 Intermediate part 24 Base part 25 First wall part 26 Second Wall 27 Opening 28 Guide 30 Bottom 31 1st surface 32 2nd surface 33 Through hole 34 Inclined surface 35 1st drainage channel (drainage channel)
36 Second drainage channel (drainage channel)
A Mounting target L Straight line T Thickness X Longitudinal direction of fixed leg 12 Y Width direction of fixed leg 12 Z Height direction of fixed leg 12

Claims (5)

With the box body,
The fixed legs that extend from the box body and are fixed to the mounting target,
It is an electrical junction box equipped with
The fixed leg has a reinforcing rib and a recess partitioned by the rib.
In the bottom of the recess, the rib side surface is the first surface, and the back surface of the first surface is the second surface.
The bottom portion is provided with a through hole penetrating from the first surface to the second surface and at least a part around the through hole on the first surface, and has an inclined surface having a slope downward toward the through hole. And have, an electrical junction box. The electrical connection box according to claim 1, wherein the thickness of the bottom portion from the inclined surface to the second surface increases toward the upstream side of the inclination of the inclined surface. The inclined surface has a valley-shaped drainage channel provided along the radial direction of the through hole.
The electrical connection box according to claim 1 or 2, wherein the drainage channel is inclined downward toward the through hole. The fixed leg has a connecting portion connected to the box body and a fixing portion fixed to the mounting target.
The electrical connection box according to claim 3, wherein the drainage channel is provided along a direction parallel to a virtual straight line connecting the connecting portion and the fixing portion. The drainage channel provided along the direction parallel to the straight line is used as the first drainage channel.
The inclined surface has a second drainage channel provided along the radial direction of the through hole.
The electrical connection box according to claim 4, wherein the second drainage channel is provided along a direction intersecting the straight line.

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