JP5394302B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box mounted on a vehicle.

  Conventionally, the thing of patent document 1 is known as an electrical connection box mounted in a vehicle. As shown in FIG. 14, the electrical junction box is configured by housing an electrical component (not shown) in a case 90. The case 90 includes a lower case 91 that opens upward, and an upper case 92 that is attached to the upper portion of the lower case 91. The lower edge portion of the peripheral wall 92A of the upper case 92 is externally fitted to the upper edge portion of the peripheral wall 91A of the lower case 91. Accordingly, the lower edge portion of the peripheral wall 92A of the upper case 92 and the upper edge portion of the peripheral wall 91A of the lower case 91 are configured to overlap in the thickness direction of the peripheral walls 91A, 92A of the two cases 91, 92. As a result, it was expected that water could be prevented from entering from the fitting portions of both cases 91 and 92.

JP 2010-41778 A

  However, in the electrical junction box according to the above configuration, a gap 93 based on assembly tolerance or dimensional tolerance is formed between the peripheral wall 92A of the upper case 92 and the peripheral wall 91A of the lower case 91. When the vehicle is washed with a high-pressure washing machine, there is a concern that relatively high-pressure water may enter the case 90 through the gap 93 between the peripheral wall 92A of the upper case 92 and the peripheral wall 91A of the lower case 91 (arrow S). reference).

  In order to solve the above problem, it may be possible to fit the packing into the gap 93 between the peripheral wall 92A of the upper case 92 and the peripheral wall 91A of the lower case 91, but there is a problem that the manufacturing cost increases.

  Accordingly, in order to prevent water from entering, it has been considered to narrow the gap 93 between the peripheral wall 92A of the upper case 92 and the peripheral wall 91A of the lower case 91. However, even if the gap 93 is narrowed, it is difficult to completely prevent water from entering between the peripheral wall 92A of the upper case 92 and the peripheral wall 91A of the lower case 91. Furthermore, when water enters a relatively narrow gap 93, the water that has passed through the gap 93 flows into a relatively large space in the case 90, so that the water is scattered from the gap 93 into the case 90. (See arrow T). As a result, there is a concern that the waterproofness of the electrical junction box is lowered.

  This invention is completed based on the above situations, Comprising: It aims at providing the electrical junction box by which water was suppressed from scattering in a case.

  The present invention is an electrical junction box containing electrical components in a case, the case having a lower case having a peripheral wall standing up and down, and an upper case assembled to the lower case from above The upper case is provided with an outer wall that is fitted on the upper end of the peripheral wall in the vertical direction at the lower end of the upper case, and the upper case is formed with a bent portion in which the outer wall is bent in the horizontal direction. A bent space surrounded by the peripheral wall and the outer wall is formed at a position corresponding to the bent portion, and a tolerance gap based on a tolerance is formed between the peripheral wall and the outer wall. In addition, both or one of the peripheral wall and the outer wall is formed at a position above the lower end edge of the outer wall so that the space between the peripheral wall and the outer wall is wider than the tolerance gap and enters the tolerance gap. The first way to distribute water Is formed in communication with the bent space and extends in a direction intersecting with the vertical direction, and the outlet that communicates the bent space with the outside is provided in both or one of the peripheral wall and the outer wall forming the bent space. Is formed to open downward.

  According to the present invention, when relatively high-pressure water hits the fitting portion between the peripheral wall and the outer wall, the water enters the tolerance gap formed between the peripheral wall and the outer wall. Subsequently, the water rises in the tolerance gap and reaches the first flow path. When water reaches the first flow path, the water collides with the inner surface of the first flow path. Then, relatively high-pressure water flows along the inner surface of the first channel after colliding with the inner surface of the first channel.

  Since the first flow path communicates with the bent space, water flows from the first flow path into the bent space. Since the outer wall is bent in the horizontal direction at the bent portion, the water flowing into the bent space collides with a portion of the outer wall that intersects the first flow path by bending.

  Since the outer wall is erected in the vertical direction, the water colliding with the outer wall is in a direction along the outer wall and receives pressure in the vertical direction. And the water which received the downward pressure among the water which collided with the outer wall flows out of a case from the outflow port formed by opening downward in bending space.

  As described above, according to the present invention, relatively high-pressure water can be guided from the gap between the outer wall and the peripheral wall to the bent portion through the first flow path, and then allowed to flow out of the case from the outlet. . Thereby, it can suppress that water splashes in a case.

As embodiments of the present invention, the following embodiments are preferable.
It is preferable that the electrical component is arranged at a position above the portion of the upper case where the outer wall is fitted onto the peripheral wall.

  According to said aspect, since the electrical component is distribute | arranged to the position above the part which an outer wall fits to a surrounding wall, it can suppress reliably that water adheres to an electrical component.

  It is preferable that an interval between the peripheral wall and the outer wall in the bent space is formed wider than an interval between the peripheral wall and the outer wall in the first flow path.

  According to said aspect, since the space | interval of the surrounding wall and outer wall in the area | region corresponding to a bending part is set rather than the space | interval of the surrounding wall and outer wall in a 1st flow path, the water which flowed in into bending space The pressure is smaller than the pressure of water flowing through the first flow path. Thereby, water stays in the bending space.

  On the other hand, when relatively high-pressure water is sprayed on the outer surface of the peripheral wall of the lower case, the water flows along the outer surface of the peripheral wall without splashing. Then, in the vicinity of the outlet, the flow rate of water flowing along the outer surface of the peripheral wall becomes higher than the flow rate of water staying in the bending space. As a result, the pressure of the water flowing along the outer surface of the peripheral wall is lower than the pressure of the water staying in the bent space inside and outside the outlet. Then, the water staying in the bending space easily flows out from the outlet to the outside where the pressure is low. Thereby, it can further suppress that water splashes in a case.

  It is preferable that an interval between the peripheral wall and the outer wall at the outlet is formed narrower than an interval between the peripheral wall and the outer wall in the bent space.

  According to said aspect, it can suppress that water enters in a case from an outflow port.

  An inner wall is formed at the lower end of the upper case so as to fit inside the upper end portion of the peripheral wall. A region surrounded by the outer wall and the inner wall opens downward and accommodates the upper end portion of the peripheral wall. It is preferable to be a groove.

  According to the above aspect, even when the water that has entered the gap between the peripheral wall and the outer wall enters the case further beyond the upper end of the peripheral wall, the water is prevented from entering the case further by the inner wall. Is done. Thereby, the waterproofness of an electrical junction box can be improved.

  In the region corresponding to the bent portion, it is preferable that the inner wall is in close contact with the peripheral wall from the inside in the thickness direction of the peripheral wall.

  The direction of pressure of the water that has flowed into the bending space changes when it collides with the outer wall. For this reason, in some cases, there is a concern that the pressure in the direction in which water enters the case increases. According to the above aspect, even when the pressure of water increases in the direction of intrusion into the case in the bent space, the inner wall is in close contact with the peripheral wall, so that it is ensured that water enters the case. Can be suppressed.

  Between the groove and the upper end of the peripheral wall, a gap between the groove and the upper end of the peripheral wall is formed wider than the tolerance gap, and water that has entered the tolerance gap can be circulated. It is preferable that the flow path is formed extending in a direction intersecting with the vertical direction, and the second flow path communicates with the bent space.

  According to the above aspect, the water that has entered the case through the tolerance gap and has risen to the upper end of the peripheral wall reaches the second flow path. Thereafter, the water collides with the inner surface of the second channel and flows along the inner surface of the second channel. Since the second flow path communicates with the bent space, water flows from the second flow path into the bent space. Thereafter, water flows out of the case from the outlet. Thereby, it can further suppress that water splashes in a case.

  In the bent space, it is preferable that the upper end portion of the peripheral wall is in contact with the ceiling surface of the groove portion from below.

  The direction of pressure of the water that has flowed into the bending space changes when it collides with the outer wall. For this reason, in some cases, there is a concern that the pressure in the direction in which water enters the case increases. According to the above aspect, even when the water pressure increases in the bending space in the bending space, the upper end portion of the peripheral wall is in close contact with the ceiling surface of the groove portion. Intrusion can be reliably suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that water splashes in the case of an electrical junction box.

The principal part enlarged front view which shows the electrical-connection box concerning Embodiment 1 of this invention An enlarged cross-sectional view of the main part showing the electrical junction box The principal part enlarged front view which shows an example of the assembly structure of an upper case and a lower case Main part enlarged front view showing the upper case and the lower case Top view showing the lower case Bottom view showing the upper case VII-VII line sectional view in FIG. VIII-VIII sectional view taken on the line in FIG. IX-IX line sectional view in FIG. XX sectional view in FIG. XI-XI sectional view taken on the line in FIG. XII-XII sectional view in FIG. The principal part expanded sectional view which shows the electrical-connection box which concerns on Embodiment 2. FIG. Expanded sectional view of the main part showing the conventional technology

<Embodiment 1>
A first embodiment in which the present invention is applied to an electric junction box 10 for a vehicle will be described with reference to FIGS. The electrical connection box 10 according to the present embodiment is disposed between a power source (not shown) and in-vehicle electrical components (not shown) such as a headlamp and a motor, and performs switching of the in-vehicle electrical components. The electrical junction box 10 is disposed, for example, in an engine room of a vehicle (not shown). The electrical junction box 10 includes a case 11 and an electrical component 12 accommodated in the case 11. In the following description, the upper side in FIG. 1 is the upper side, and the lower side is the lower side.

(Overall structure)
The case 11 is made of synthetic resin and includes a lower case 13 that opens upward and an upper case 14 that is assembled to the lower case 13 from above. The lower case 13 is made of synthetic resin and has a peripheral wall 15 that stands up and down. In the present embodiment, the lower case 13 is closed by a bottom wall 16 formed at the lower end portion of the peripheral wall 15.

  The upper case 14 has a side wall 17 erected in the vertical direction. The lower end portion of the side wall 17 is made of synthetic resin and is provided with an outer wall 18 that is fitted on the upper end edge of the peripheral wall 15 and is erected in the vertical direction.

  In the upper case 14, the electrical component 12 is accommodated at a position above a portion where the outer wall 18 is fitted on the peripheral wall 15. The electrical component 12 is arranged in an arrangement portion 19 provided on the side wall 17 of the upper case 14. For example, the arrangement portion 19 may be formed integrally with the upper case 14. Moreover, the arrangement | positioning part 19 is good also as a structure which is formed in the upper case 14 with a synthetic resin separately, and is attached to the inside of the upper case 14 by well-known means, such as bolting. Further, a printed circuit board may be used as the placement portion 19 and the printed circuit board on which the electrical component 12 is mounted may be accommodated in the upper case 14. The electrical component 12 is accommodated in the case 11 by any means as necessary.

  As the electrical component 12, for example, any electrical component 12 such as a connector, a fuse, a mechanical relay, a semiconductor relay, a resistor, or a capacitor can be used as necessary.

  The upper case 14 and the lower case 13 can be assembled by a known method. FIG. 3 shows an example of an assembly structure of the upper case 14 and the lower case 13. On the outer side surface of the side wall 17 of the upper case 14, a lock portion 20 that protrudes outward is provided. On the outer surface of the peripheral wall 15 of the lower case 13, a lock receiving portion 21 that is elastically engaged with the lock portion 20 is provided at a position corresponding to the lock portion 20. When the upper case 14 is assembled to the lower case 13 from above, the lock receiving portion 21 of the lower case 13 rides on the lock portion 20 of the upper case 14, and when the upper case 14 is further moved downward, the lock receiving portion 21 returns. The lock receiving portion 21 is deformed so as to be engaged with the lock portion 20 from above. Thereby, the upper case 14 and the lower case 13 are assembled | attached integrally.

  The lock receiving portion 21 may be provided in the lower case 13 and the lock portion 20 may be provided in the upper case 14. In addition, as a means for assembling the upper case 14 and the lower case 13, any means such as bolt fastening can be used.

  In the present embodiment, the lower case 13 is configured to be closed by the bottom wall 16, but the present invention is not limited thereto, and the lower case 13 is configured to open downward, and a lower cover (not shown) is assembled from below the lower case 13. The opening of the lower case 13 may be closed.

  The upper case 14 may be configured such that an upper wall (not shown) is provided at the upper end of the side wall 17 and the upper wall of the upper case 14 is closed by the upper wall. Moreover, it is good also as a structure which opens upper part of the upper case 14 and block | closes opening by attaching the upper cover which is not shown in figure to this opening from upper direction.

(Fitting structure between upper case 14 and lower case 13)
As shown in FIG. 2, a protrusion 22 that protrudes outward in the thickness direction of the peripheral wall 15 is formed in an annular shape at a position near the upper end of the peripheral wall 15 of the lower case 13. The outer wall 18 has a first outer wall 23 positioned above the protrusion 22 and a first outer wall 23 positioned outside the protrusion 22 in the thickness direction of the peripheral wall 15 in a state where the lower case 13 and the upper case 14 are assembled. 2 outer walls 24. The second outer wall 24 is formed to be offset outward from the first outer wall 23 in the thickness direction of the first outer wall 23. As shown in FIG. 7, the lower end portion of the second outer wall 24 is formed to be positioned slightly below the protrusion 22.

  As shown in FIG. 7, an inner wall 25 that fits into the upper end of the peripheral wall 15 is formed at the lower end of the side wall 17 of the upper case 14. The inner wall 25 is formed to be offset inward in the thickness direction of the side wall 17 with respect to the lower end portion of the side wall 17. A region surrounded by the outer wall 18 and the inner wall 25 is a groove portion 26 that accommodates the upper end portion of the peripheral wall 15. The groove portion 26 is formed to open downward.

  As shown in FIG. 6, the upper case 14 is formed with a bent portion 27 where the outer wall 18 bends in the horizontal direction (the direction along the paper surface in FIG. 6). In the present embodiment, the outer wall 18 is bent at a substantially right angle. More specifically, the outer wall 18 is formed in a slightly curved shape at the bent portion 27 and is formed in a so-called round shape. The upper case 14 has a substantially square shape when viewed from the vertical direction (direction passing through the paper surface in FIG. 6), and the bent portions 27 are formed at the four corners of the upper case 14.

  As shown in FIG. 4, a region of the inner wall 25 formed at a position corresponding to the bent portion 27 is formed so as to protrude downward, and is formed on the lower case 13 from above (indicated by an arrow A in FIG. 4). Direction) When assembling the upper case 14, the guide portion 28 guides the upper case 14 to a normal position. As shown in FIG. 7, the height position of the lower end portion of the inner wall 25 that is different from the guide portion 28 is formed at a position that substantially matches the height position of the lower end portion of the first outer wall 23. Further, as shown in FIG. 8, the height position of the lower end portion of the guide portion 28 is formed below the height position of the lower end portion of the second outer wall 24.

  As shown in FIG. 6, the inner wall 25 is formed to bend in the horizontal direction (the direction along the paper surface in FIG. 6) in the region corresponding to the bent portion 27. The inner wall 25 has a curved surface shape that is gentler than the outer wall 18 and is bent in a region corresponding to the bent portion 27.

(Tolerance clearance 29)
As shown in FIG. 7, between the peripheral wall 15 of the lower case 13 and the outer wall 18 of the upper case 14, the dimensional tolerance of the lower case 13, the dimensional tolerance of the upper case 14, and the lower case 13 and the upper case 14 A tolerance gap 29 based on the assembly tolerance is formed. The tolerance gap 29 formed between the peripheral wall 15 and the outer wall 18 includes a tolerance gap 29A formed between the tip of the protrusion 22 and the second outer wall 24, and between the peripheral wall 15 and the first outer wall 23. Examples include the formed tolerance gap 29B and the tolerance gap 29C formed between the peripheral wall 15 and the inner wall 25.

(First flow path 30)
As shown in FIG. 7, the gap between the peripheral wall 15 and the outer wall 18 is between the peripheral wall 15 and the outer wall 18 at a position above the lower end portion of the outer wall 18 (second outer wall 24). Also, the first flow path 30 that is set widely is formed. In the present embodiment, the first flow path 30 is formed in a space surrounded by the peripheral wall 15, the upper surface of the protrusion 22, the second outer wall 24, and the lower end of the first outer wall 23. The first flow path 30 is formed to extend in a direction that is in tolerance with the vertical direction (a direction that penetrates the paper surface in FIG. 7). In the present embodiment, the first flow path 30 is formed extending in the horizontal direction. The first flow path 30 is capable of circulating water that has entered upward from a tolerance gap 29A formed between the protrusion 22 and the peripheral wall 15 (see arrow B).

(Bending space 31)
As shown in FIG. 9, a bent space 31 surrounded by the peripheral wall 15 and the outer wall 18 is formed at a position corresponding to the bent portion 27. In the bent space 31, the outer wall 18 is bent in the horizontal direction (the direction along the paper surface in FIG. 9). Further, the peripheral wall 15 of the lower case 13 is formed to bend in the horizontal direction in a region corresponding to the bent portion 27. The curved shape of the peripheral wall 15 and the curved shape of the inner wall 25 are formed so as to be substantially matched. As shown in FIG. 9, the first flow path 30 is formed in communication with the bending space 31.

  As shown in FIG. 11, in the region corresponding to the bent portion 27, the peripheral wall 15 has a curved surface shape that is gentler than the outer wall 18 and is bent. Thereby, in the region corresponding to the bent portion 27, the interval O between the peripheral wall 15 and the second outer wall 24 is formed wider than the interval N between the peripheral wall 15 and the second outer wall 24 in the first flow path 30.

  In addition, as shown in FIG. 12, in the region corresponding to the bent portion 27, the interval P between the peripheral wall 15 and the first outer wall 23 is larger than the tolerance gap 29 </ b> B formed between the peripheral wall 15 and the first outer wall 23. Widely formed.

(Second flow path 32)
As shown in FIG. 7, a gap between the groove portion 26 and the upper end portion of the peripheral wall 15 between the groove portion 26 and the upper end portion of the peripheral wall 15 is a tolerance formed between the peripheral wall 15 and the first outer wall 23. A second flow path 32 that is formed wider than the clearance 29B and a tolerance clearance 29C formed between the peripheral wall 15 and the inner wall 25 is formed. The first flow path 30 is formed to extend in a direction that is in tolerance with the vertical direction (a direction that penetrates the paper surface in FIG. 7). In the present embodiment, the second flow path 32 is formed to extend in the horizontal direction. The second flow path 32 can flow water that has entered from a tolerance gap 29 </ b> B formed between the peripheral wall 15 and the first outer wall 23. Further, the second flow path 32 is formed in communication with the bent space 31 described above.

(Outlet 33)
As shown in FIG. 8, in the bent space 31, an outlet 33 that communicates between the bent space 31 and the outside of the case 11 is formed between the peripheral wall 15 and the outer wall 18 so as to open downward. In the present embodiment, the outflow port 33 is formed between the protruding end portion of the protrusion 22 and the second outer wall 24. The water that has sunk into the bent space 31 flows downward from the outflow hole 33 (see arrow C).

  As shown in FIG. 10, the distance M between the peripheral wall 15 (projection 22) and the second outer wall 24 at the outlet 33 is set wider than the tolerance gap 29 formed between the peripheral wall 15 and the outer wall 18. Yes. In the present embodiment, the protruding end portion of the protruding portion 22 at the outflow port 33 is formed so as to be bent in a gently curved shape as compared with the second outer wall 24. Thereby, the space | interval M of the protrusion 22 of the protrusion 22 in the outflow port 33 and the 2nd outer wall 24 is larger than the tolerance clearance 29A formed between the protrusion end of the protrusion 22 and the 2nd outer wall 24. Widely formed.

  Further, as shown in FIG. 11, the interval M between the peripheral wall 15 (projection 22) and the second outer wall 24 at the outlet 33 is set to be narrower than the interval O between the peripheral wall 15 and the second outer wall 24 in the bending space 31. Has been. In the present embodiment, the peripheral wall 15 in the bent space 31 is formed to bend in a gently curved shape as compared with the outer wall 18 in the bent space 31. Thereby, the interval M between the protruding end portion of the protrusion 22 at the outlet 33 and the second outer wall 24 is formed to be narrower than the interval O between the peripheral wall 15 and the second outer wall 24 in the bending space 31.

(Water stop structure)
As shown in FIG. 8, in the region corresponding to the bent portion 27, the inner wall 25 comes into close contact with the peripheral wall 15 from the inside in the thickness direction of the peripheral wall 15. Further, in the region corresponding to the bent portion 27, the upper end portion of the peripheral wall 15 comes into contact with the ceiling surface 34 of the groove portion 26 from below.

(Function, effect)
Then, the effect | action and effect of this embodiment are demonstrated. When the inside of the engine room of the vehicle is subjected to high-pressure washing, relatively high-pressure water is injected into the electrical junction box 10 disposed in the engine room. At this time, relatively high-pressure water may directly hit the fitting portion between the upper case 14 and the lower case 13. Then, water permeates into the tolerance gap 29 </ b> A formed between the protrusion 22 of the peripheral wall 15 and the second outer wall 24. Subsequently, the water rises in the tolerance gap 29 </ b> A and reaches the first flow path 30. When the water reaches the first flow path 30, the water collides with the inner surface of the first flow path 30. Specifically, the water collides with the upper surface of the protrusion 22, the peripheral wall 15, the second outer wall 24, and the lower end of the first outer wall 23. Then, relatively high-pressure water flows along the inner surface of the first flow path 30 without rebounding. Since the first flow path 30 is formed to extend in the horizontal direction (direction passing through the paper surface in FIG. 7) and communicates with the bent space 31, water flows into the bent space 31.

  In the bent space 31, since the second outer wall 24 constituting the first flow path 30 is bent in the horizontal direction, a region that is tolerated with the first flow path 30 is formed in the second outer wall 24. The water that has flowed into the bent space 31 collides with the second outer wall 24 that has a tolerance with the first flow path 30. Since the second outer wall 24 is erected in the vertical direction, the water colliding with the second outer wall 24 is subjected to pressure in the vertical direction in the direction along the second outer wall 24. Of the water colliding with the second outer wall 24, the water that has received downward pressure is formed in the bent space 31 so as to open downward between the protruding end of the protrusion 22 and the second outer wall 24. It flows out of the case 11 from the outlet 33 formed. As described above, in the electrical junction box 10 according to the present embodiment, the water can be discharged out of the case 11 by using the pressure of the water to enter the case 11.

  As described above, according to the present embodiment, relatively high-pressure water is supplied from the tolerance gap 29 </ b> A formed between the second outer wall 24 and the protrusion 22 to the bent portion 27 via the first flow path 30. , It can be discharged out of the case 11 from the outlet 33. Thereby, it can suppress that water splashes in the case 11. FIG.

  In the present embodiment, the distance M between the protrusion 22 and the second outer wall 24 at the outlet 33 is formed wider than the tolerance gap 29 </ b> A formed between the protrusion 22 and the second outer wall 24. Yes. Thereby, water can be efficiently discharged out of the case 11 from the outflow port 33.

  Furthermore, in this embodiment, the gap between the groove 26 and the upper end of the peripheral wall 15 is formed wider than the tolerance gaps 29B and 29C between the groove 26 and the upper end of the peripheral wall 15, and the tolerance gap 29B. The second flow path 32 through which the water that has entered can be circulated extends in a direction intersecting the vertical direction, and the second flow path communicates with the bent space 31.

  As a result, the water that has risen to the tolerance gap 29B formed between the peripheral wall 15 and the first outer wall 23 over the first flow path 30 and further up to the upper end of the peripheral wall 15 is transferred to the second flow path. Reach 32. Thereafter, the water collides with the inner surface of the second flow path 32 and flows along the inner surface of the second flow path 32. Specifically, water collides with the upper end surface of the peripheral wall 15 and the inner surface of the groove portion 26. Since the second flow path 32 communicates with the bent space 31, water flows from the second flow path 32 into the bent space 31. Thereafter, water flows out of the case 11 from the outlet 33 in the same manner as described above. Thereby, it can further suppress that water splashes in case 11.

  In the present embodiment, the interval O between the peripheral wall 15 and the second outer wall 24 in the bent space 31 is formed wider than the interval N between the peripheral wall 15 and the second outer wall 24 in the first flow path 30. Thereby, the pressure of the water that has flowed into the bending space 31 becomes smaller than the pressure of the water that flows through the first flow path 30. As a result, water stays in the bending space 31.

  On the other hand, when relatively high-pressure water is sprayed on the outer surface of the peripheral wall 15 of the lower case 11, the water flows along the outer surface of the peripheral wall 15 without splashing back. Of the water flowing along the outer surface of the peripheral wall 15, the water that collided from below with the lower surface of the protrusion 22 formed on the peripheral wall 15 does not rebound, and the direction along the lower surface of the protrusion 22 (the paper surface in FIG. Flows in the direction of penetration). As described above, since the outflow port 33 is formed between the protruding end surface of the protrusion 22 and the second outer wall 24 (see FIG. 8), the flow velocity is relatively high in the vicinity of the outflow port 33. Water is flowing.

  Thereby, near the outflow port 33, the flow rate of water flowing along the outer surface of the peripheral wall 15 is higher than the flow rate of water staying in the bending space 31. As a result, the pressure of water flowing along the outer surface of the peripheral wall 15 inside and outside the outlet 33 becomes lower than the pressure of water staying in the bent space 31. Then, the water staying in the bending space 31 easily flows out from the outlet 33 to the outside where the pressure is low. Thereby, it can further suppress that water splashes in case 11.

  In FIG. 8, the peripheral wall 15 is bent in the horizontal direction below the protrusion 22 in the peripheral wall 15, corresponding to the bent portion 27. Further, a curved surface is formed on the outer surface of the peripheral wall 15 in the bent portion as described above. When the curvature radius of the curved surface is reduced, the water that flows along the outer surface of the peripheral wall 15 is separated from the peripheral wall 15 at a portion where the peripheral wall 15 is bent. The water separated from the peripheral wall 15 flows outward (rightward in FIG. 8) from the outer surface of the peripheral wall 15 and flows through the vicinity of the outflow port 33. The flow rate of water flowing away from the peripheral wall 15 is faster than the flow rate of water flowing along the outer surface of the peripheral wall 15. Thereby, since the flow velocity of the water flowing in the vicinity of the outlet 33 is further increased, the water pressure outside the outlet 33 is further reduced. As a result, the outflow amount of the water staying in the bending space 31 from the outflow port 33 can be increased.

  In the present embodiment, the distance M between the protrusion 22 of the peripheral wall 15 and the second outer wall 24 at the outlet 33 is formed to be narrower than the distance P between the peripheral wall 15 and the first outer wall 23 in the bending space 31. ing. Thereby, water can be prevented from entering the case 11 from the outlet 33.

  In the present embodiment, an inner wall 25 that is fitted into the upper end portion of the peripheral wall 15 is formed at the lower end of the upper case 14, and a region surrounded by the first outer wall 23 and the inner wall 25 opens downward. In addition, the upper end portion of the peripheral wall 15 is a groove portion 26 that is accommodated. As a result, the water that has entered the tolerance gap 29B formed between the peripheral wall 15 and the first outer wall 23 through the first flow path 30 passes further into the case 11 beyond the upper end of the peripheral wall 15. Even in this case, water is prevented from entering the case 14 by the inner wall 25 any more. Thereby, the waterproofness of the electrical junction box 10 can be improved.

  Further, the water flowing into the bending space 31 changes the direction of pressure by colliding with the outer wall 18. For this reason, in some cases, there is a concern that the pressure in the direction in which water enters the case 11 increases. In view of the above points, in the present embodiment, the inner wall 25 is in close contact with the peripheral wall 15 from the inside in the thickness direction of the peripheral wall 15 in the region corresponding to the bent portion 27. Thereby, even when the pressure of water increases in the direction of entering the case 11 in the bent space 31, the inner wall 25 is in close contact with the peripheral wall 15, so that it is ensured that water enters the case 11. Can be suppressed.

  Further, in the region corresponding to the bent portion 27, the upper end portion of the peripheral wall 15 is in contact with the ceiling surface 34 of the groove portion 26 from below. Thereby, even when the pressure of water increases in the bending space 31 in the direction of entering the case 11, the upper end portion of the peripheral wall 15 is in close contact with the ceiling surface 34 of the groove portion 26. It is possible to reliably suppress the intrusion into the inside.

  Moreover, according to this embodiment, it is suppressed that water splashes in the case 11. FIG. As a result, as in the present embodiment, the electric component 12 is disposed at a position above the portion of the upper case 14 where the outer wall 18 is fitted on the peripheral wall 15, so that water adheres to the electric component 12. This can be reliably suppressed.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. In the present embodiment, the distance Q between the protruding end of the protrusion 22 and the second outer wall 24 at the outlet 33 is a tolerance formed between the protruding end of the protrusion 22 and the second outer wall 24. It is formed substantially the same as the gap 29B.

  Since the configuration other than the above is substantially the same as that of the first embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

  According to this embodiment, in the outlet 33, the interval Q between the protruding end of the protrusion 22 and the second outer wall 24 is a tolerance formed between the protruding end of the protrusion 22 and the second outer wall 24. Compared with the case where it is formed wider than the gap 29 </ b> A, water can be prevented from entering the case 11 from the outlet 33.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the present embodiment, the first flow path 30 and the second flow path 32 are configured to extend in a substantially horizontal direction. However, the present invention is not limited thereto, and the first flow path 30 and the second flow path 32 are Further, it may be configured to extend at an angle with respect to the horizontal direction. Further, the direction in which the first flow path 30 extends may be different from the direction in which the second flow path 32 extends.
(2) In the present embodiment, the bent portion 27 is configured such that the outer wall 18 bends substantially at right angles in the horizontal direction. However, the present invention is not limited to this. The outer wall 18 may be bent at an acute angle in the horizontal direction.
(3) In the present embodiment, the upper case 14 has a configuration in which four bent portions 27 are formed. However, the present invention is not limited to this, and the configuration in which three or five or more bent portions 27 are formed is provided. Also good.
(4) In the present embodiment, the interval between the peripheral wall 15 and the outer wall 18 in the bent space 31 is set to be wider than the interval between the peripheral wall 15 and the outer wall 18 in the first flow path 30. Without being limited thereto, the interval between the peripheral wall 15 and the outer wall 18 in the bent space 31 may be the same as the interval between the peripheral wall 15 and the outer wall 18 in the first flow path 30 or may be narrow.
(5) The first flow path 30 may be formed so as to be recessed so that the outer wall 18 is separated from the peripheral wall 15, and may be formed so as to be recessed so that the peripheral wall 15 is separated from the outer wall 18. Alternatively, the outer wall 18 and the peripheral wall 15 may be formed so as to be depressed so as to be separated from each other, and may have any shape as necessary.
(6) In the present embodiment, one first flow path 30 is formed. However, the present invention is not limited to this, and the first flow path 30 is formed in a plurality of stages in the vertical direction. Also good.
(7) The second flow path 32 may be omitted.
(8) The inner wall 25 may be omitted.
(9) In the present embodiment, the inner wall 25 is in close contact with the peripheral wall 15 from the inner side in the thickness direction of the peripheral wall 15 in the region corresponding to the bent portion 27. However, the present invention is not limited to this. A gap may be formed between the two.
(10) In the present embodiment, in the region corresponding to the bent portion 27, the upper end portion of the peripheral wall 15 is configured to abut on the ceiling surface 34 of the groove portion 26 from below. It is good also as a structure by which a clearance gap is formed between and the groove part 26. FIG.
(11) In the present embodiment, the electric junction box 10 is arranged in the engine room of the vehicle. However, the electric junction box 10 is not limited to this, and the electric junction box 10 has a relatively high pressure when subjected to high-pressure car washing. It is good also as a structure arrange | positioned in the arbitrary places where the water of this is injected.

DESCRIPTION OF SYMBOLS 10 ... Electrical junction box 11 ... Case 12 ... Electrical component 13 ... Lower case 14 ... Upper case 15 ... Peripheral wall 18 ... Outer wall 22 ... Projection 23 ... 1st outer wall 24 ... 2nd outer wall 25 ... Inner wall 26 ... Groove part 27 ... Bending part 29 ... Tolerance clearance 30 ... First flow path 31 ... Bending space 32 ... Second flow path 33 ... Outlet 34 ... Ceiling surface

Claims (8)

An electrical junction box containing electrical components in a case,
The case includes a lower case having a peripheral wall erected in the vertical direction, and an upper case assembled to the lower case from above,
At the lower end of the upper case, an outer wall that is externally fitted to the upper end portion of the peripheral wall is erected in the vertical direction, and the upper case is formed with a bent portion in which the outer wall is bent in the horizontal direction, A bent space surrounded by the peripheral wall and the outer wall is formed at a position corresponding to the bent portion,
A tolerance gap based on tolerance is formed between the peripheral wall and the outer wall, and both or one of the peripheral wall and the outer wall is positioned above the lower end edge of the outer wall, and the peripheral wall and the outer wall. Is formed wider than the tolerance gap, and a first flow path capable of flowing water entering the tolerance gap extends in a direction intersecting the vertical direction and is formed in communication with the bent space.
An electrical junction box, wherein an outlet for communicating the bent space and the outside is formed in a downward opening on both or one of the peripheral wall and the outer wall forming the bent space. 2. The electrical junction box according to claim 1, wherein the electrical component is arranged at a position above the portion of the upper case where the outer wall is fitted on the peripheral wall. The distance between the peripheral wall and the outer wall in the bent space is formed wider than the distance between the peripheral wall and the outer wall in the first flow path. Electrical junction box. 4. The space between the peripheral wall and the outer wall at the outlet is formed narrower than the space between the peripheral wall and the outer wall in the bent space. 5. Electrical connection box as described in. An inner wall is formed at the lower end of the upper case so as to fit inside the upper end portion of the peripheral wall. A region surrounded by the outer wall and the inner wall opens downward and accommodates the upper end portion of the peripheral wall. The electrical junction box according to any one of claims 1 to 4, wherein the electrical junction box is a groove. 6. The electrical junction box according to claim 5, wherein in the region corresponding to the bent portion, the inner wall is in close contact with the peripheral wall from the inside in the thickness direction of the peripheral wall. Between the groove and the upper end of the peripheral wall, a gap between the groove and the upper end of the peripheral wall is formed wider than the tolerance gap, and water that has entered the tolerance gap can be circulated. 7. The electrical junction box according to claim 5, wherein the flow path is formed to extend in a direction intersecting with the vertical direction, and the second flow path communicates with the bent space. . 8. The electrical junction box according to claim 5, wherein, in the bent space, an upper end portion of the peripheral wall abuts on a ceiling surface of the groove portion from below.

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