JP2012090477A - Electrical connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical connection box whose waterproofness is improved.SOLUTION: An electrical connection box 10 includes: a plurality of relay modules 13 in which a relay 22 is stored in a case 21 for each relay module; and a holder 11 which has an upper wall 12, and a plurality of engaged cylindrical portions 15 engaged with the relay modules 13, which protrude upward from the upper wall 12. The case 21 is provided with a case water stop wall 36, which projects from the outer surface thereof and then extends downward, and the case water stop wall 36 is externally engaged with an upper end edge of the engaged cylindrical portion 15 from above for the whole periphery. A drain groove 35 is formed in a region between the adjacent engaged cylindrical portions 15 on an upper surface of the upper wall 12. The drain groove 35 inclines downward toward a peripheral edge portion of the upper wall 12 and is opened to a side of the holder 11.

Description

  The present invention relates to an electrical junction box.

  Conventionally, the thing of patent document 1 is known as an electrical junction box. The electrical junction box is provided with a plurality of recesses arranged on the upper surface, and a relay is inserted into each recess. Waterproofing ribs protrude from the outer surface of the relay. The waterproof rib closes the upper surface of the recess. A waterproof space is provided between the outer surface of the relay and the inner surface of the recess, and a rubber ring is disposed in the waterproof space. When the surface of the rubber ring is in close contact with the outer surface of the relay and the inner surface of the recess, the space between the relay and the recess is waterproofed.

JP 2005-29023 A

  In the above configuration, a rubber ring is used for waterproofing between the relay and the recess. For this reason, there is a problem that the number of parts increases. When a plurality of relays are installed, the number of rubber rings increases according to the number of relays, which is a particular problem.

  In addition, when a plurality of relays are arranged side by side, water easily collects in a region between adjacent relays. In the prior art, the edges of the waterproof ribs of adjacent relays are in contact with each other in the region where the water tends to accumulate. For this reason, there existed a problem that water permeated easily from the clearance gap between the waterproofing ribs located adjacent.

  This invention is completed based on the above situations, Comprising: It aims at providing the electrical-connection box with improved waterproofness.

  The present invention is an electrical junction box, and includes a plurality of relay modules in which a relay is accommodated in a case, and a plurality of fitting cylinder portions into which the relay modules are fitted into the upper wall. A case-stopping wall that is externally fitted over the entire periphery of the upper end edge of the fitting tube portion from above and protrudes from the outer surface of the case. The upper surface of the upper wall is inclined downward toward the peripheral edge of the upper wall and opened to the side of the holder. A drainage groove is formed.

  According to the present invention, the fitting tube portion is formed to protrude upward from the upper surface of the upper wall of the holder, and the case water blocking wall of the relay module is fitted on the upper end edge of the fitting tube portion from above. It has become. Thereby, the fitting part of a fitting cylinder part and a case water stop wall is located above the upper surface of the upper wall of a holder. Thereby, even when water flows down to the upper surface of the holder, this water can be prevented from entering from the fitting portion between the fitting tube portion and the case water blocking wall.

  Moreover, according to this invention, the case water stop wall is externally fitted to the upper end edge of the fitting cylinder part. As a result, a so-called labyrinth structure can be formed by bending the water ingress path. As a result, the space between the case and the fitting tube portion can be waterproofed without increasing the number of parts.

  Moreover, according to this invention, the drainage groove is formed in the area | region between adjacent fitting cylinder parts. Thereby, the water which flowed down to the area | region between adjacent fitting cylinder parts among the upper walls of a holder flows in into the drainage groove formed in the upper surface of an upper wall first. Subsequently, the water flowing into the drainage groove is guided by the inclination of the drainage groove, reaches the side of the holder, and is drained to the side wall of the holder. Thereby, since it can suppress that water accumulates in the area | region between adjacent fitting cylinder parts among the upper surfaces of a holder, water infiltrates in a fitting cylinder part from the clearance gap between a fitting cylinder part and a case water stop wall. This can be further suppressed.

As embodiments of the present invention, the following embodiments are preferable.
The relay module includes a connector housing that opens downward, and a standby connector that fits into the connector housing from below in a state where the relay module is fitted to the fitting cylinder portion is provided on the bottom wall of the fitting cylinder portion. The relay module is fixed between the lower end edge of the connector housing and the bottom wall of the fitting cylinder part in a state where the relay module is fitted to the fitting cylinder part at a normal position. It is preferable that water voids are formed.

  If water enters from between the case water blocking wall of the relay module and the fitting cylinder portion, the water flows down the outer surface of the case and reaches the lower end edge of the connector housing. At this time, if the relay module is set so that the lower end edge of the connector housing comes into contact with the bottom wall of the standby connector in a state in which the relay module is engaged with the fitting cylinder portion at the normal position, There is a concern that water may infiltrate through a minute gap with the bottom wall of the connector by capillary action, and water may enter between the connector housing and the standby connector. According to said aspect, the water stop space | gap is formed between the lower end edge of a connector housing, and the bottom wall of a fitting cylinder part. Since the capillary phenomenon is suppressed by the water stop gap, it is possible to prevent water from entering from between the lower end edge of the connector housing and the bottom wall of the fitting cylinder portion.

  In a state where the connector housing and the standby connector are properly fitted, at least one of the surface of the connector housing that faces the standby connector and the surface of the standby connector that faces the connector housing is separated from the other. It is preferable that a concave groove is formed.

  According to the above aspect, even when water enters between the connector housing and the standby connector in a state where the connector housing and the standby connector are normally fitted, the capillary phenomenon is suppressed in the portion where the concave groove is formed. Since it can do, it can control that water penetrates into the inside rather than a ditch.

  It is preferable that the concave groove is formed in at least one of the side wall of the connector housing and the side wall of the standby connector.

  According to the above aspect, since the capillarity is suppressed by the concave groove, the water that has entered between the connector housing and the standby connector is more inside than the connector housing and the side wall of the standby connector in which the concave groove is formed. Infiltration is suppressed. Thereby, it is suppressed that water reaches the upper wall of the connector housing or the upper surface of the standby connector.

  The concave groove is preferably formed to extend in the vertical direction.

  According to the above aspect, the water flowing into the groove due to the capillary phenomenon being suppressed in the groove is allowed to flow downward in the groove, and then the lower end edge of the groove is below the standby connector and the connector housing. To flow down. Thereby, the water that has entered between the connector housing and the standby connector can be discharged to the outside of the standby connector and the connector housing.

  The case of the relay module is formed so as to open downward, the connector housing is attached by closing the opening of the case, and the outer surface of the connector housing extends in the vertical direction and extends to the inner surface of the case. It is preferable that a connector housing recess that is recessed so as to be separated from the connector is formed.

  According to the above aspect, the capillary phenomenon is suppressed by the connector housing recess. Thereby, the water that has entered from between the case of the relay module and the connector housing is prevented from entering upward by the connector housing recess. Thereby, the waterproofness of a relay module can be improved.

  It is preferable that the connector housing recess is inclined so as to be separated from the inner surface of the case as it goes upward.

  According to the above aspect, in the concave portion of the connector housing, the gap between the inner surface of the case and the outer surface of the connector housing increases as it goes upward, so that capillary action is further suppressed as it goes upward. Thereby, the waterproofness of a relay module can be improved further.

  In the case of the relay module, a circuit board on which the relay is mounted is accommodated in a substantially vertical posture, and a lower end edge of the circuit board is accommodated with a gap from the connector housing. It is preferable.

  According to the above aspect, the capillary phenomenon is suppressed by the gap. Thereby, the water that has entered from between the case of the relay module and the connector housing does not enter the interior of the gap between the lower edge of the circuit board and the connector housing. Thereby, the waterproofness of a relay module can be improved.

  It is preferable that a heat transfer plate that contacts the circuit board and the side wall of the case is accommodated in the case of the relay module between the circuit board and the side wall of the case.

  According to the above aspect, the heat generated by the relay when energized is transmitted to the circuit board, and further transmitted from the heat transfer plate in contact with the circuit board to the side wall of the case in contact with the heat transfer plate. Thereafter, heat is dissipated from the side wall of the case to the outside of the case. Thereby, it can suppress that the heat which generate | occur | produced with the relay at the time of electricity supply is confined in a case.

  It is preferable that the lower end edge of the heat transfer plate is accommodated with a gap from the connector housing.

  According to the above aspect, the capillary phenomenon is suppressed by the gap. Thereby, the water that has entered from between the case of the relay module and the connector housing does not enter the interior of the gap between the lower end edge of the heat transfer plate and the connector housing. Thereby, the waterproofness of a relay module can be improved.

  It is preferable that a heat transfer plate recess that is spaced from the inner surface of the case is formed on a surface near the lower end of the heat transfer plate and facing the case.

  According to said aspect, the heat exchanger plate recessed part is formed in the position near the lower end part of a heat exchanger plate. Since the capillary phenomenon is suppressed by the heat transfer plate recess, water can be prevented from entering above the heat transfer plate recess. Thereby, the waterproofness of a relay module can be improved.

  It is preferable that a drain hole is formed through the bottom wall of the fitting tube portion.

  According to said aspect, the water which reached even the bottom wall of the fitting cylinder part flows down from the drain hole. Thereby, it can suppress that water accumulates in the bottom wall of a fitting cylinder part.

  A lower cover is assembled below the holder, and a drain slope is formed on the inner surface of the bottom wall of the lower cover, and a drain outlet is formed at the bottom of the drain slope. Is preferred.

  The water flowing down from the drain hole flows down on the drain slope formed on the inner surface of the bottom wall of the lower cover. Water flows down the drain slope and is discharged to the outside of the lower cover from the drain outlet located at the lowermost part of the drain slope. As a result, even when water enters the inside of the lower cover, the water can be reliably discharged to the outside of the electrical junction box.

  According to the present invention, the waterproofness of the electrical junction box can be improved.

The perspective view which shows the electrical-connection box concerning Embodiment 1 of this invention. Side view showing electrical junction box Side view showing electrical junction box Top view showing the electrical junction box Bottom view showing electrical junction box Side view showing the relay module Sectional view showing the relay module Bottom view showing relay module Top view showing the holder Main part enlarged plan view showing the fitting cylinder part XI-XI sectional view taken on the line in FIG. XII-XII line sectional view in FIG. XIII-XIII line sectional view in FIG. XIV-XIV sectional view in FIG. XV-XV cross-sectional view in FIG. The bottom view which shows the relay module which concerns on Embodiment 2 of this invention.

<Embodiment 1>
A first embodiment in which the present invention is applied to an on-vehicle electrical junction box 10 will be described with reference to FIGS. The electrical junction box 10 according to the present embodiment is disposed between a battery (not shown) and in-vehicle electrical components such as a motor and a lamp, and supplies electric power supplied from the battery to the in-vehicle electrical components. Or power is cut off. In the electrical junction box 10, a plurality of (four in this embodiment) relay modules 13 are attached to the upper wall 12 of the holder 11. In the following description, the upper side in FIG. 1 is the upper side, and the lower side is the lower side.

(Holder 11)
The holder 11 made of synthetic resin has a rectangular shape when viewed from above, and has a generally block shape. A pair of attachment portions 14 projecting outward are formed on the side wall of the holder 11. The holder 11 is attached to the vehicle body (not shown) by the attachment portion 14.

  As shown in FIGS. 1 to 4, the holder 11 has an upper wall 12. On the upper surface of the upper wall 12, a plurality (four in this embodiment) of fitting cylinders 15 that protrude upward and into which the relay module 13 is fitted are formed. In the present embodiment, the fitting tube portion 15 has a substantially rectangular tube shape.

(Lower cover 16)
As shown in FIG. 1, a synthetic resin lower cover 16 is assembled below the holder 11. The lower cover 16 has a rectangular shape when viewed from above. A plurality of locking protrusions 17 </ b> A projecting outward are formed on the side wall of the holder 11. The lower cover 16 has a plurality of lock receiving portions 18A that are elastically engaged with the lock protruding portions 17A at positions corresponding to the lock protruding portions 17A. The lock receiving portions 18A are elastic with respect to the lock protruding portions 17A. Thus, the holder 11 and the lower cover 16 are assembled integrally.

  On the bottom wall of the lower cover 16, a lead-out cylinder portion 20 from which an electric wire 19 described later is led out is formed so as to protrude downward. As shown in FIG. 5, the lead-out cylinder portion 20 has a cylindrical shape that communicates the inside and the outside of the lower cover 16.

(Relay module 13)
As shown in FIG. 6, the relay module 13 has a substantially rectangular parallelepiped shape. As shown in FIG. 7, the relay module 13 houses a circuit board 23 on which a relay 22 is mounted in a case 21 made of synthetic resin that opens downward. In the present embodiment, a mechanical relay is used as the relay 22. The circuit board 23 has a substantially rectangular shape. A conductive path (not shown) is formed on one or both of the front surface and the back surface of the circuit board 23 by a printed wiring technique. The lead terminal of the relay 22 is connected to this conductive path by a known method such as reflow soldering. As shown in FIGS. 12 and 13, two relays 22 are mounted on one circuit board 23. Further, the electronic component 45 is mounted on the circuit board 23 on the same surface as the surface on which the relay 22 is mounted. The lead of the electronic component 45 is soldered to the conductive path while penetrating the circuit board 23.

  A synthetic resin heat transfer plate 24 is superimposed on the surface of the circuit board 23 opposite to the surface on which the relay 22 is mounted. The heat transfer plate 24 is formed in substantially the same size and shape as the circuit board 23. The heat transfer plate 24 is formed with an escape hole (not shown) for escaping the lead penetrating the circuit board 23 at a position corresponding to the lead of the electronic component 45.

  An L-shaped connector terminal 25 as viewed from the side is connected to a position near the lower end of the circuit board 23. One end of the connector terminal 25 is inserted into a through hole formed in the circuit board 23 and connected to a conductive path of the circuit board 23 by a known method such as flow soldering. In the heat transfer plate 24, an escape hole 26 is formed at a position corresponding to one end portion of the connector terminal 25 to allow one end portion of the connector terminal 25 to escape.

  An opening 27 of the case 21 that opens downward is closed by a connector housing 28 made of synthetic resin. The connector housing 28 is formed to open downward. The other end of the connector terminal 25 passes through a wall portion constituting the connector housing 28 and is arranged inside the connector housing 28.

  The connector housing 28 is formed with a protruding protrusion 17B, and the case 21 is formed with a lock receiving portion 18B that is elastically engaged with the locking protrusion 17B at a position corresponding to the locking protrusion 17B. ing. The case 21 and the connector housing 28 are assembled together by elastically engaging the lock projection 17B and the lock receiving portion 18B.

  As shown in FIG. 7, a substrate pressing portion 29 protruding inward is formed on the inner surface of the upper wall of the case 21. The circuit board 23 and the heat transfer plate 24 are sandwiched between the board pressing portion 29 and the connector housing 28 and the inner surface of the side wall of the case 21 in a state where they are overlapped with each other. Thus, the circuit board 23 is in contact with the heat transfer plate 24, and the heat transfer plate 24 is in contact with the inner surface of the side wall of the case 21.

(Standby connector 30)
9, on the bottom wall 31 of the fitting cylinder portion 15, the standby connector 30 fitted into the connector housing 28 from below with the relay module 13 fitted into the fitting cylinder portion 15 is upward (see FIG. 9). 9 is formed so as to project in the direction penetrating the paper surface in the direction toward the front side. One standby connector 30 is formed in one fitting tube portion 15. The standby connector 30 has a generally prismatic shape.

  As shown in FIGS. 11 and 12, a bus bar 32 and a standby terminal 33 are accommodated in the standby connector 30. An end portion of the bus bar 32 is formed with a bifurcated sandwiching portion 34, and the connector terminal 25 is sandwiched by the sandwiching portion 34 in a state where the standby connector 30 is fitted to the connector housing 28. And the bus bar 32 are electrically connected. Further, in a state where the standby connector 30 is fitted in the connector housing 28, the connector terminal 25 elastically contacts a tongue piece (not shown) formed on the standby terminal 33, whereby the connector terminal 25 and the standby terminal 33 are contacted. Are electrically connected to each other. An end portion of the electric wire 19 is connected to the standby terminal 33, and the electric wire 19 is routed through the lower cover 16 and led out from the lead-out cylinder portion 20.

(Waterproof structure)
On the upper surface of the upper wall 12 of the holder 11, a drainage groove 35 is formed in the region between the adjacent fitting cylinders 15 so as to be inclined downward toward the peripheral edge of the upper wall 12. The drainage groove 35 is formed to extend to the side surface of the holder 11, and is open to the side of the holder 11.

  As shown in FIG. 4, the drainage groove 35 is formed on the upper wall 12 of the holder 11 so as to intersect with an area located between the four fitting cylinder portions 15. The drainage groove 35 is formed so as to incline downward from the vicinity of the intersection of the diagonal lines of the holder 11 having a rectangular shape when viewed from above, toward the side edge of the holder 11 (see FIG. 15).

  The configuration in which the drainage groove 35 is inclined is also shown in FIGS. 2 and 3. Of the drainage groove 35 shown in FIG. 2, the portion located on the back side in the direction penetrating the paper surface is formed highest, and the drainage groove 35 is inclined downward toward the front side in the direction penetrating the paper surface. The side surface of the holder 11 is open to the side. A similar configuration is described in FIG.

  As shown in FIG. 7, a case water blocking wall 36 whose cross-sectional shape is L-shaped is formed on the outer surface of the side wall of the case 21 so as to protrude outward. The case water blocking wall 36 is formed to protrude outward in the thickness direction of the side wall of the case 21 and to extend downward. As shown in FIG. 6, the case water blocking wall 36 is formed so as to surround the entire circumference of the side wall of the case 21. As shown in FIG. 11, in the state where the relay module 13 is fitted into the fitting cylinder portion 15, the case water blocking wall 36 is externally fitted from above to the upper end edge of the fitting cylinder portion 15 over the entire circumference. It is like that. In a state where the relay module 13 is fitted in the fitting cylinder portion 15, a slight gap is formed between the upper end edge of the fitting cylinder portion 15 and the inner wall of the case water blocking wall 36. Since the capillary phenomenon is suppressed, the intrusion of water into the case 21 is suppressed.

  As shown in FIG. 13, the lower end edge of the connector housing 28 and the bottom wall 31 of the fitting cylinder part 15 are spaced apart from each other in a state where the relay module 13 is fitted to the fitting cylinder part 15 at the normal position. This gap is a water stop gap 37. Further, a water stop gap 37 is also formed between the lower end edge of the case 21 of the relay module 13 and the bottom wall 31 of the fitting cylinder portion 15.

  As shown in FIG. 9, a plurality of concave grooves 38 are formed on the outer surfaces of the four side walls of the standby connector 30. The concave groove 38 is formed so as to extend in the vertical direction (direction passing through the paper surface in FIG. 9). In a state where the connector housing 28 and the standby connector 30 are properly fitted, the surface of the standby connector 30 facing the connector housing 28 is separated from the connector housing 28 by the concave groove 38 (see FIG. 13).

  As shown in FIG. 8, a connector housing recess 39 that extends in the vertical direction (direction passing through the paper surface in FIG. 8) and sinks away from the inner surface of the side wall of the case 21 is formed on the outer surface of the side wall of the connector housing 28. Is formed.

  Further, as shown in FIG. 7, the connector housing recess 39A formed above the lock projection 17B in the connector housing recess 39 has a side wall of the case 21 as it goes upward from the portion where the lock projection 17B is formed. It is formed so that it may be separated from.

  As shown in FIG. 12, a flange 40 is formed on the side wall of the lower cover 16 so as to project outward and surround the side wall of the lower cover 16 over the entire circumference. In a state where the holder 11 and the lower cover 16 are assembled, the lower end edge of the side wall of the holder 11 comes into contact with the upper surface of the flange 40 from above. A gap is formed between the upper edge of the side wall of the lower cover 16 and the inner surface of the side wall of the holder 11.

  In a state where the relay module 13 is fitted to the fitting cylinder portion 15, the circuit board 23 is accommodated in a substantially vertical posture inside the relay module 13. In other words, the circuit board 23 is accommodated in the case 21 such that the direction parallel to the plate surface is along the direction of gravity. The term “substantially vertical” includes the case where the direction parallel to the plate surface of the circuit board 23 coincides with the direction of gravity, and also includes the case where they do not coincide but substantially coincide.

  The lower end edge of the circuit board 23 is spaced apart from the connector housing 28 disposed so as to close the opening 27 of the case 21, and a gap is formed between the lower end edge of the circuit board 23 and the connector housing 28. Has been.

  As shown in FIG. 7, the heat transfer plate 24 is also accommodated in the case 21 in a substantially vertical posture. In other words, the heat transfer plate 24 is accommodated in the case 21 such that the direction parallel to the plate surface is along the direction of gravity. “Substantially vertical” includes the case where the direction parallel to the plate surface of the heat transfer plate 24 coincides with the direction of gravity, and also includes the case where they do not coincide but substantially coincide.

  The lower end edge of the heat transfer plate 24 is spaced apart from the connector housing 28 disposed so as to close the opening 27 of the case 21, and there is a gap between the lower end edge of the heat transfer plate 24 and the connector housing 28. Is formed.

  A heat transfer plate concavity 41 that is spaced from the inner surface of the side wall of the case 21 is formed on the surface near the lower end of the heat transfer plate 24 and facing the side wall of the case 21. The heat transfer plate recess 41 is formed so as to gradually move away from the side wall of the case 21 toward the lower end edge of the heat transfer plate 24.

  As shown in FIG. 10, a plurality of drain holes 42 are formed through the bottom wall 31 of the fitting cylinder portion 15. The water that has flowed down to the bottom wall 31 of the fitting cylinder portion 15 by this drain hole 42 flows down through the drain hole 42 (see FIGS. 12 and 14). In the present embodiment, 16 drain holes 42 are formed in one fitting cylinder portion 15.

  As shown in FIG. 15, a drainage slope 43 that slopes downward is formed on the inner surface of the bottom wall of the lower cover 16. In the present embodiment, the bottom surface of the lower cover 16 is formed so as to be inclined so that the position in the vicinity of the intersection of the diagonal lines on the bottom surface is the lowest part. A drain port 44 that communicates the inside and outside of the lower cover 16 is formed at the lowermost portion of the drain slope 43. The drainage port 44 extends in the vertical direction and is bent in a crank shape.

(Function, effect)
Then, the effect | action and effect of this embodiment are demonstrated. When the bonnet of the vehicle is opened for maintenance or the like, it may rain, or water may enter the electric connection box 10 when water enters the engine room during car washing. This water flows down to the upper surface of the relay module 13 and the upper surface of the holder 11.

  According to the present embodiment, the fitting cylinder portion 15 is formed to protrude upward from the upper surface of the upper wall 12 of the holder 11, and the case water blocking wall 36 of the relay module 13 is the upper end edge of the fitting cylinder portion 15. It is adapted to be externally fitted to the top. Thereby, the fitting part of the fitting cylinder part 15 and the case water stop wall 36 is located above the upper surface of the upper wall 12 of the holder 11. Thereby, even when water flows down to the upper surface of the holder 11, this water can be prevented from entering from the fitting portion between the fitting cylinder portion 15 and the case water blocking wall 36.

  Further, according to the present embodiment, the case water blocking wall 36 is externally fitted to the upper end edge of the fitting cylinder portion 15. As a result, a so-called labyrinth structure can be formed by bending the water ingress path. As a result, the space between the case 21 and the fitting tube portion 15 can be waterproofed without increasing the number of parts.

  Further, a gap is formed between the upper end edge of the fitting tube portion 15 and the case water blocking wall 36. Since the capillary phenomenon is suppressed by the gap, it is possible to suppress water from entering the case 21.

  Further, according to the present embodiment, the drainage groove 35 is formed in the region between the adjacent fitting tube portions 15. Thereby, first, the water that has flowed into the region between the adjacent fitting cylinders 15 in the upper wall 12 of the holder 11 flows into a drainage groove 35 formed on the upper surface of the upper wall 12. Subsequently, the water that has flowed into the drainage groove 35 is guided by the inclination of the drainage groove 35, reaches the side of the holder 11, and is drained to the side wall of the holder 11 (see the arrow in FIG. 15). Thereby, since it can suppress that water accumulates in the area | region between the adjacent fitting cylinder parts 15 among the upper surfaces of the holder 11, water is fitted from the clearance gap between the fitting cylinder part 15 and the case water stop wall 36. Intrusion into the portion 15 can be further suppressed.

  Further, since a gap is also formed between the upper edge of the side wall of the lower cover 16 and the side wall of the holder 11, capillary action is suppressed by this gap. Thereby, it can suppress that water permeates into the inside from between the lower cover 16 and the holder 11.

  If water enters from between the case water blocking wall 36 of the relay module 13 and the fitting cylinder portion 15, the water flows down the outer surface of the case 21 and reaches the lower end edge of the connector housing 28. . At this time, in a state where the relay module 13 is fitted to the fitting cylinder portion 15 at the normal position, if the lower end edge of the connector housing 28 is set to contact the bottom wall of the standby connector 30, There is a concern that water may enter the gap between the lower end edge and the bottom wall of the standby connector 30 by capillarity, and the water may enter between the connector housing 28 and the standby connector 30. According to the present embodiment, since the water stop gap 37 is formed between the lower end edge of the connector housing 28 and the bottom wall 31 of the fitting cylinder portion 15, the lower end edge of the connector housing 28 and the fitting cylinder are formed. It is possible to prevent water from entering from the space between the bottom wall 31 of the portion 15 by capillary action. Furthermore, in this embodiment, since the water stop gap 37 is also formed between the lower end edge of the case 21 and the bottom wall 31 of the fitting cylinder portion 15, the ingress of water can be further suppressed.

  According to the present embodiment, in a state where the connector housing 28 and the standby connector 30 are properly fitted, a concave groove 38 that is separated from the connector housing 28 is formed on the surface of the standby connector 30 that faces the connector housing 28. ing. Thereby, in a state where the connector housing 28 and the standby connector 30 are normally fitted, the capillary phenomenon can be suppressed in the portion where the concave groove 38 is formed, so that water can be prevented from entering the concave groove 38. .

  Furthermore, in the present embodiment, the concave groove 38 is formed on the side wall of the standby connector 30. Thereby, the water that has entered between the connector housing 28 and the standby connector 30 is suppressed from entering the inside of the side wall of the standby connector 30 in which the concave groove 38 is formed. Thereby, it is suppressed that water reaches the upper wall 12 of the connector housing 28 or the upper surface of the standby connector 30.

  In the present embodiment, the concave groove 38 is formed to extend in the vertical direction. After the capillary phenomenon is suppressed in the concave groove 38, the water accumulated in the concave groove 38 flows downward in the concave groove 38, and then from the lower end edge of the concave groove 38 to the lower side of the standby connector 30 and the connector housing 28. To flow down. Thereby, the water that has entered between the connector housing 28 and the standby connector 30 can be discharged to the outside of the standby connector 30 and the connector housing 28.

  Further, in this embodiment, the case 21 of the relay module 13 is formed to open downward, and the connector housing 28 is attached by closing the opening of the case 21. A connector housing recess 39 that extends in the direction and is recessed so as to be separated from the inner surface of the case 21 is formed. Since the capillary phenomenon is suppressed by the connector housing recess 39, even when water enters from between the case 21 of the relay module 13 and the connector housing 28, the water can enter above the connector housing recess 39. Can be suppressed. Thereby, the waterproofness of the relay module 13 can be improved.

  Further, the connector housing recess 39A is inclined so as to be separated from the inner surface of the case 21 as it goes upward. Thereby, in the connector housing recess 39 </ b> A, the distance between the inner surface of the side wall of the case 21 and the outer surface of the side wall of the connector housing 28 increases in the upward direction. Thereby, the capillary phenomenon is further suppressed as it goes upward. As a result, the waterproof property of the relay module 13 can be further improved.

  In the present embodiment, the circuit board 23 on which the relay 22 is mounted is accommodated in the case 21 of the relay module 13 in a substantially vertical posture, and the lower edge of the circuit board 23 is connected to the connector housing 28. It is accommodated with a gap. Since the capillarity is suppressed by this gap, the water that has entered from between the case 21 of the relay module 13 and the connector housing 28 enters more inside than the gap between the lower edge of the circuit board 23 and the connector housing 28. To be suppressed. Thereby, the waterproofness of the relay module 13 can be improved.

  In the present embodiment, the lower end edge of the heat transfer plate 24 is accommodated with a gap from the connector housing 28. Since the capillarity is suppressed by this gap, the water that has entered from between the case 21 of the relay module 13 and the connector housing 28 is located inside the gap between the lower end edge of the heat transfer plate 24 and the connector housing 28. Intrusion is suppressed. Thereby, the waterproofness of the relay module 13 can be improved.

  Further, a heat transfer plate recess 41 that is spaced from the inner surface of the case 21 is formed on the surface near the lower end of the heat transfer plate 24 and facing the case 21. Since the capillary phenomenon is suppressed by the heat transfer plate recess 41, it is possible to prevent water from entering above the heat transfer plate recess 41. Thereby, the waterproofness of the relay module 13 can be improved.

  In the present embodiment, a drain hole 42 is formed through the bottom wall 31 of the fitting cylinder portion 15. Thereby, the water that has reached the bottom wall 31 of the fitting cylinder portion 15 flows downward from the drain hole 42. Thereby, it can suppress that water accumulates in the bottom wall 31 of the fitting cylinder part 15. FIG. As a result, water can be further prevented from entering through the gap between the connector housing 28 and the standby connector 30.

  Furthermore, in the present embodiment, the lower cover 16 is assembled below the holder 11, and a drain slope 43 is formed on the inner surface of the bottom wall of the lower cover 16. A drainage port 44 is formed in the front. As a result, the water flowing down from the drain hole 42 flows down onto the drain slope 43 formed on the inner surface of the bottom wall of the lower cover 16. The water flows down the drain slope 43 and is discharged to the outside of the lower cover 16 from the drain port 44 located at the lowermost part of the drain slope 43. Thereby, even when water enters the lower cover 16, the water can be reliably discharged to the outside of the electrical junction box 10. Specifically, the water flowing down from the drain hole 42 can be quickly discharged from the drain port 44 to the outside. Thereby, it can suppress reliably that water accumulates inside the electrical junction box 10.

  In addition, since the drain port 44 is bent in a crank shape, even when water is applied from below the drain port 44, for example, when the engine room is washed, water enters the lower cover 16. Can be suppressed.

  In the present embodiment, in the case 21 of the relay module 13, a heat transfer plate 24 that contacts the circuit board 23 and the side wall of the case 21 is accommodated between the circuit board 23 and the side wall of the case 21. Yes. As a result, the heat generated by the relay 22 when energized is transmitted to the circuit board 23, and further transmitted from the heat transfer plate 24 in contact with the circuit board 23 to the side wall of the case 21 in contact with the heat transfer plate 24. The Thereafter, heat is dissipated from the side wall of the case 21 to the outside of the case 21. Thereby, it can suppress that the heat which generate | occur | produced in the relay 22 at the time of electricity supply is confined in the case 21. FIG.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. The connector housing 28 is provided with a back wall 51 at a position on the back side (upper side) in the opening direction. On the inner surface of the inner wall of the connector housing 28, a concave groove 50 having a closed loop shape surrounding the plurality of connector terminals 25 penetrating the inner wall 51 is formed. The concave groove 50 in the present embodiment has a substantially square shape, but may have an arbitrary shape such as an elliptical shape or an oval shape as necessary.

  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.

  Since the capillarity phenomenon is suppressed by forming the concave groove 50 on the inner surface of the inner wall 51 of the connector housing 28, water that has entered between the inner wall 51 of the connector housing 28 and the upper surface of the standby connector 30 It is possible to suppress entry into the area surrounded by the concave groove 50. Thereby, it can suppress that the adjacent connector terminals 25 are short-circuited with water.

<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 this embodiment, although the relay 22 used the mechanical relay, it is not restricted to this, The relay 22 may use a semiconductor relay.
(2) In the present embodiment, the four relay modules 13 are assembled to one holder 11. However, the present invention is not limited to this, and the number of relay modules 13 assembled to one holder 11 is two, three, Or five or more plural may be sufficient.
(3) In the present embodiment, the drainage groove 35 is configured to be inclined downward from the vicinity of the intersection of the diagonal lines on the upper wall 12 of the holder 11 toward the side wall of the holder 11. It is good also as a structure which inclines downward from the side wall toward another side wall.
(4) In the present embodiment, the lower end edge of the connector housing 28 and the bottom wall 31 of the fitting cylinder 15 are separated from each other. The bottom wall 31 of the cylindrical portion 15 may abut.
(5) In the present embodiment, the drain hole 42 is formed in the bottom wall 31 of the fitting cylinder portion 15, but the drain hole 42 may be omitted.
(6) In the present embodiment, the lower cover 16 is assembled to the lower portion of the holder 11. However, the present invention is not limited to this, and the lower cover 16 may not be assembled to the holder 11.
(7) In the present embodiment, the drain slope 43 is formed on the bottom wall of the lower cover 16. However, the present invention is not limited to this, and the drain slope 43 may not be formed on the bottom wall of the lower cover 16. Moreover, it is good also as a structure in which the drain outlet 44 is not formed.
(8) In this embodiment, the groove 38 is formed on the outer surface of the standby connector 30. However, the present invention is not limited to this, and the groove 38 may be formed on the inner surface of the connector housing 28. . Moreover, it is good also as a structure formed in both the outer surface of the standby connector 30 and the inner surface of the connector housing 28. FIG.
(9) In the present embodiment, the groove 38 is formed to extend in the vertical direction. However, the present invention is not limited thereto, and the groove 38 is formed along the circumferential direction of the standby connector 30. Also good. Further, the concave groove 38 may be formed along the circumferential direction of the inner wall of the connector housing 28.
(10) In the present embodiment, the connector housing recess 39 is formed on the outer surface of the connector housing 28, but the connector housing recess 39 may be omitted.
(11) In this embodiment, a gap is formed between the lower edge of the circuit board 23 and the connector housing 28. However, the present invention is not limited to this, and the lower edge of the gap circuit board 23 is connected to the connector housing 28. You may contact | abut.
(12) In the present embodiment, a gap is formed between the lower end edge of the heat transfer plate 24 and the connector housing 28. However, the present invention is not limited to this, and the lower end edge of the heat transfer plate 24 is the connector housing. 28 may abut.
(13) In the present embodiment, the heat transfer plate 24 is arranged between the circuit board 23 and the side wall of the case 21, but the present invention is not limited to this, and the heat transfer plate 24 may be omitted. For example, the circuit board 23 and the inner surface of the case 21 may be in contact with each other. Further, the circuit board 23 and the case 21 may be filled with a synthetic resin material or the like. In the present embodiment, the heat transfer plate 24 is made of synthetic resin, but a metal heat transfer plate 24 may be used by electrically insulating the heat transfer plate 24 from the circuit board 23.
(14) In the present embodiment, the heat transfer plate 24 is formed with the heat transfer plate recess 41. However, the present invention is not limited to this, and the heat transfer plate recess 41 may be omitted.

DESCRIPTION OF SYMBOLS 10 ... Electrical junction box 11 ... Holder 12 ... Upper wall 13 ... Relay module 15 ... Fitting cylinder part 16 ... Lower cover 21 ... Case 22 ... Relay 23 ... Circuit board 24 ... Heat-transfer plate 28 ... Connector housing 30 ... Standby connector 31 ... Bottom wall 35 of fitting cylinder part 35 ... Drain groove 36 ... Case water stop wall 37 ... Water stop gap 38 ... Recess groove 39, 39A ... Connector housing recess 41 ... Heat transfer plate recess 42 ... Drain hole 43 ... Drain slope 44 ... Drain

Claims (13)

A plurality of relay modules in which a relay is accommodated in a case, and a holder having an upper wall and a plurality of fitting cylinder portions into which the relay module is fitted on the upper wall.
On the outer surface of the case, a case water stop wall that is externally fitted to the upper end edge of the fitting cylinder part from above is formed to protrude from the outer surface of the case and extend downward.
An electrical connection in which a drainage groove is formed in the region between the adjacent fitting cylinders on the upper surface of the upper wall, and is inclined downward toward the peripheral edge of the upper wall and opens to the side of the holder. box. The relay module includes a connector housing that opens downward, and a standby connector that fits into the connector housing from below in a state where the relay module is fitted to the fitting cylinder portion is provided on the bottom wall of the fitting cylinder portion. Is arranged to protrude,
A water stop gap is formed between a lower end edge of the connector housing and the bottom wall of the fitting cylinder part in a state where the relay module is fitted to the fitting cylinder part at a normal position. Item 3. An electrical junction box according to Item 1. In a state where the connector housing and the standby connector are properly fitted, at least one of the surface of the connector housing that faces the standby connector and the surface of the standby connector that faces the connector housing is separated from the other. The electrical junction box according to claim 2, wherein a concave groove is formed. The electrical connection box according to claim 3, wherein the concave groove is formed in at least one of a side wall of the connector housing and a side wall of the standby connector. The electrical junction box according to claim 3 or 4, wherein the concave groove is formed to extend in a vertical direction. The case of the relay module is formed to open downward, and the connector housing is attached by closing the opening of the case,
The electrical connection box according to any one of claims 1 to 5, wherein a connector housing recess is formed on an outer surface of the connector housing so as to extend in a vertical direction and to be recessed from the inner surface of the case. . The electrical connection box according to claim 6, wherein the connector housing recess is inclined so as to be separated from the inner surface of the case as it goes upward. In the case of the relay module, a circuit board on which the relay is mounted is accommodated in a substantially vertical posture, and a lower end edge of the circuit board is accommodated with a gap from the connector housing. The electrical junction box according to any one of claims 1 to 7. The electrical connection according to claim 8, wherein a heat transfer plate that contacts the circuit board and the side wall of the case is accommodated in the case of the relay module between the circuit board and the side wall of the case. box. The electrical connection box according to claim 9, wherein a lower end edge of the heat transfer plate is accommodated with a gap from the connector housing. The electrical connection according to claim 9 or 10, wherein a heat transfer plate concavity spaced apart from the inner surface of the case is formed on a surface near the lower end of the heat transfer plate and facing the case. box. The electrical junction box according to any one of claims 1 to 11, wherein a drain hole is formed through the bottom wall of the fitting tube portion. A lower cover is assembled below the holder, and a drain slope is formed on the inner surface of the bottom wall of the lower cover, and a drain outlet is formed at the bottom of the drain slope. The electrical junction box according to any one of claims 1 to 12.

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