JP4542484B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box.

  2. Description of the Related Art As an electrical connection box mounted on an automobile, there is a structure having a circuit structure housed in a case. The circuit configuration body includes a circuit board, a bus bar arranged along the back surface of the circuit board, and a switching member such as a relay mounted on the front surface side of the circuit board. The case has a frame that is arranged and fixed along the periphery of the circuit board, a cover part that is assembled to the frame so as to cover the circuit board from the front side, and a back surface of the frame that is fixed to the back side of the circuit board. It is provided with a heat sink that closes the opening on the side. The end portion of the bus bar is extended to the outside of the circuit board and then introduced into a connector housing provided in the case to serve as a terminal for connecting to the mating connector.

In addition, as an electrical connection box, there exist some which are disclosed by patent document 1. FIG.
JP 2003-164039 A

  In this type of electrical junction box, water may accumulate on the upper surface of the case due to condensation or the like, but when the amount of water accumulated on the upper surface of the case increases, the water falls along the outer surface of the case. Here, when the connector housing for connection with an external connector is opened at the lower part of the case, there is a concern that water that has traveled through the case may enter the inside from the connector housing.

  This invention is completed based on the above situations, Comprising: It aims at providing the electrical junction box which can avoid the penetration | invasion of the water to the inside of a case.

An electrical junction box according to the invention of claim 1 for solving the above-mentioned problems comprises a circuit structure and a case for housing the circuit structure, and a connector connectable to an external connector at the lower part of the case An electrical junction box provided with a housing, wherein a vertical portion of the outer wall of the case has a connector hood portion bulging outwardly covering the outer periphery of the connector housing, and the vertical wall of the outer wall. The portion is provided with an eaves portion protruding outward at a position above the connector hood portion, and an end edge portion of the eave portion is continuous with an outer side surface of the connector hood portion. And

  The invention according to claim 2 is the electrical junction box according to claim 1, wherein the upper surface of the eaves portion is provided with an inclined surface that is inclined downward from the center in the width direction toward both end edges. It is characterized by.

According to the first aspect of the present invention, the water falling along the outer wall of the case is blocked by the eaves portion and is prevented from reaching the connector housing, so that moisture can be prevented from entering from the connector housing.
Further, the water dropped on the eaves part is guided to the outer side surface of the connector hood part and is drained away from the connector housing. Thereby, the penetration | invasion of the water | moisture content from a connector housing can be prevented.

  According to the invention of claim 2, the water dropped on the eaves portion is drained from both ends of the eaves portion by flowing along the inclined surface according to the gradient of the inclined surface, so that water accumulates on the eaves portion, It is possible to avoid a situation in which water spills from the eaves and flows down along the outer wall of the case again.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to FIGS. The electrical connection box 1 of the present embodiment is mounted on an automobile, and is interposed between a battery (not shown) and electrical components (not shown) such as a lamp and an audio, and each power supplied from the battery is supplied to the electrical connection box 1. In addition to distributing and supplying the electrical components, the control of switching the power supply is performed. 1 and 2, the electrical connection box 1 is drawn so that the front side faces upward. However, when the electrical connection box 1 is mounted on an automobile, the electrical connection box 1 has a fuse as shown in FIGS. The main body portion 24 of the block 23 is positioned on the upper side, and the arm portion 25 of the fuse block 23 extends in the downward direction. Hereinafter, the vertical and horizontal directions will be described with reference to the state of being mounted on a vehicle.

  The electrical junction box 1 is configured to include a circuit structure 10 and a case 20 that houses the circuit structure 10.

  The circuit structure 10 includes a circuit board 11 whose plate surface is directed in the vertical direction, a plurality of bus bars 12 arranged along the back surface (the right surface in FIG. 4) of the circuit board 11, and the front surface side of the circuit board 11 (see FIG. 4 and the switching member 13 such as a relay mounted on the left surface side). The bus bar 12 is bonded to the back surface of the circuit board 11 via an adhesive sheet S, and the first terminal portion 14 formed at the end of the bus bar 12 protrudes from the upper end edge of the circuit board 11. A second terminal part 15 formed at the end of the circuit board 11 protrudes from the lower edge of the circuit board 11.

  The case 20 includes a frame 21 having a substantially rectangular frame shape made of an insulating material such as a synthetic resin, a metal heat dissipating plate 22 fixed to the frame 21 so as to close the opening on the back side thereof, and the frame 21. A synthetic resin fuse block 23 assembled from above, a synthetic resin cover 31 assembled so as to close the opening on the surface side (opposite to the heat sink 22) of the frame 21, and the fuse block 23 The first housing 26 made of synthetic resin and the second to fourth housings 27, 28, 29 made of synthetic resin attached to the lower edge of the frame 21 are configured.

  The frame 21 is disposed so as to continuously surround the entire circuit structure 10 along the periphery of the circuit board 11 and is fixed to the surface of the heat radiating plate 22 with an adhesive (not shown). Has been. The plurality of first terminal portions 14 described above are arranged side by side along the upper edge portion of the frame 21.

  The heat sink 22 is generally similar to the circuit board 11, and the back surface of the bus bar 12 is fixed to the surface of the heat sink 22 with an adhesive (not shown).

The fuse block 23 is arranged along the upper edge portion of the frame 21 and has a horizontally long main body portion 24 whose front side portion protrudes in the front side direction from the cover portion 31, and a lower side from both left and right ends of the main body portion 24. It consists of a pair of arm part 25 of the form extended in the shape of a cantilever.
On the upper surface of the main body portion 24, two right and left housing portions 24A for housing fuses (not shown) are formed so as to protrude upward from the upper surface of the main body portion 24 in a rectangular block shape and open to the upper surface side. ing. Further, the upper end portion of the first terminal portion 14 is inserted from the lower side from the lower side of the main body portion 24.

  A first housing 26 is assembled from the lower side to a portion of the fuse block 23 protruding to the front side. The first housing 26 is provided with a cylindrical fitting portion that opens downward, and an external connector can be fitted therein. A substantially lower half region of the terminal fitting 30 is accommodated in the fitting tube portion, and a substantially upper half region of the terminal fitting 30 is inserted into the main body portion 24 from below. The terminal fitting 30 and the first terminal portion 14 are connected through the fuse and the relay terminal 16 in the main body portion 24.

  The cover portion 31 is generally similar to the circuit board 11 as a whole, and corresponds to the plate-like cover plate portion 31A ("vertical wall portion of the outer wall" of the present invention) formed slightly larger than the circuit board 11. And a side wall portion 31B raised along the peripheral edge of the lid plate portion 31A, and has a shallow dish shape that opens to the back surface side (the surface facing the circuit board 11) as a whole. This cover part 31 is assembled | attached with respect to the flame | frame 21 from the surface side. In the assembled state, the surface side of the circuit board 11 accommodated in the frame 21 is covered with the cover portion 31.

  The lower part of the cover part 31 bulges outward (leftward in FIG. 4) leaving both left and right ends, and this bulge part is a connector hood part 32. The connector hood portion 32 is partitioned into three hoods 33. An opening 33A is provided on the lower surface of each hood 33, and the second to fourth housings 27, 28, and 29 are disposed there to close the opening 33A. Each of the second to fourth housings 27, 28, 29 has a fitting cylinder portion that opens downward, and a mating connector (not shown) is assembled in each fitting cylinder portion.

  On the outer side surface of the cover plate portion 31 </ b> A in the cover portion 31, an eaves portion 34 protrudes outward from the connector hood portion 32 at a position slightly lower than the upper end edge. The eaves portion 34 has a rib shape extending continuously in the left-right direction, and is inclined downwardly from the center position in the left-right direction toward the left and right. In the eaves portion 34, the gradual slope portion 35 is inclined with a gentle downward slope from the position corresponding to the left and right edges of the connector hood portion 32 to the inner side, and the outer side is steeper than the gradual slope portion 35. The steep slope 36 is inclined with a downward slope. Thereby, the upper surface of the eaves part 34 is formed as an inclined surface 34 </ b> A that has a center position in the left-right direction as a ridge line and inclines with a downward gradient from the left to the right. The lower end portion of the steeply inclined portion 36 is connected to the upper left and right edges of the connector hood portion 32, whereby the edge of the eave portion 34 is formed on the left and right side surfaces 32 </ b> A (outside of the present invention) Each corresponding to the side).

  In this embodiment, since the eaves part 34 is provided on the outer side surface of the cover part 31, the water falling along the outer side surface of the cover part 31 is blocked by this eaves part 34, and the second Access to the fourth housings 27, 28 and 29 is prevented. Thereby, the penetration | invasion of the water | moisture content from the 2nd-4th housing 27,28,29 can be prevented.

  Further, since the upper surface of the eaves part 34 is formed as an inclined surface 34A with the center position in the left-right direction as a ridge line and descending from there to the left and right, the water falling on the eaves part 34 is moved in the left-right direction according to the gradient of the inclined surface 34A. And drained from both ends of the eaves 34. As a result, it is possible to avoid a situation in which water accumulates on the eaves portion 34, and the water spills from the eaves portion 34 and flows down along the outer wall of the cover portion 31 again.

  Further, since the edge of the eaves portion 34 is continuous with the left and right side surfaces 32A of the connector hood portion 32, the water dropped on the eaves portion 34 is guided to the side surface 32A of the connector hood portion 32, Draining is performed avoiding the fourth housings 27, 28, and 29. Thereby, the penetration | invasion of the water | moisture content from the 2nd-4th housing 27,28,29 can be prevented.

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, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, the upper surface of the eaves portion 34 is inclined to form the inclined surface 34A. However, the eaves portion itself may not be inclined, and only the upper surface may be inclined. In addition, it is not necessary to provide an inclination.
( 2 ) In the above embodiment, the eaves 34 is provided on the surface of the cover 31. However, the position where the eaves 34 is provided is not limited to the above form. For example, the case having a bottomed case and the opening of the case In the case of being configured with a lid portion that closes, it may be provided on the bottom wall outer surface of the case portion.

Overall perspective view of electrical junction box of embodiment Exploded perspective view of electrical junction box of embodiment Front view of electrical junction box of embodiment AA sectional side view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electrical junction box 10 ... Circuit structure 20 ... Case 27, 28, 29 ... 2nd-4th housing (connector housing)
31A ... Cover plate part (vertical wall part of the outer wall)
32 ... Connector hood 32A ... Side surface (outer side surface)
34 ... eaves part 34A ... inclined surface

Claims (2)

An electrical connection box comprising a circuit structure and a case for housing the circuit structure, wherein a lower part of the case is provided with a connector housing connectable to an external connector,
In the case, in the vertical wall portion of the outer wall, a connector hood portion covering the outer periphery of the connector housing is formed to bulge outward,
The vertical wall portion of the outer wall is provided with an eaves portion protruding outward at a position above the connector hood portion ,
An electrical junction box, wherein an edge portion of the eaves portion is continuous with an outer side surface of the connector hood portion .   The electrical junction box according to claim 1, wherein an inclined surface is provided on the upper surface of the eaves portion so as to be inclined downward from the width direction center side toward both end edges.

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