JP5429555B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box mounted on an automobile or the like, and more particularly, to an electrical junction box having a drainage structure.

  In an automobile, an electrical connection box such as a fuse box, a relay box, or a junction box is mounted with a suitable space secured in a vehicle compartment, an engine room, or the like.

  Such an electrical junction box contains an electrical circuit composed of a bus bar, a single core wire, or the like on which electrical components such as fuses and connectors are mounted. May cause problems such as electric leakage and short circuit. Therefore, it is desirable to avoid adverse effects on the electrical circuit by quickly draining water that has entered the electrical junction box.

  Therefore, conventionally, as described in Japanese Patent Application Laid-Open No. 2001-186627 (Patent Document 1), a drain hole is formed in the bottom wall portion of the electric junction box, and water collected on the bottom wall portion is externally supplied. A structure for discharging is proposed. In general, an electrical junction box is configured by, for example, assembling two cases, a lower case and an upper case, at each opening, and superposing the peripheral wall of the upper case on the peripheral wall of the lower case in an extrapolated state. The lower case is mounted on the automobile with the upper case positioned on the upper side. Therefore, as described in Patent Document 1, by forming a drain hole in the bottom wall portion of the lower case, the water accumulated in the electric junction box can be discharged.

  By the way, there are various mounting states of the electrical junction box depending on the installation space and the like, and there are cases where the assembly direction of the openings of the lower case and the upper case is horizontal (vertical mounting). Conventionally, in such an electrical connection box mounted vertically, the problem of drainage inside the electrical connection box has hardly been considered. In the case of vertical installation, since the lowermost part of the electrical connection box is the overlapping part of each peripheral wall part of the lower case and the upper case, the water guided downward inside the electrical connection box is in each peripheral wall part. This is because it was thought that the gas was discharged to the outside through the gap between the overlapping surfaces.

  However, as a result of a detailed study by the present inventor, the electrical connection box mounted vertically is improved particularly in the case where the insulating plate for wiring the electric circuit is arranged vertically in a state of spreading in the vertical direction inside the electrical connection box. It became clear that there was an inherent problem. That is, since the vertically arranged insulating plate is positioned and supported with respect to the electric junction box at the lower end, the lowermost part of the electric junction box is the outer peripheral edge of the insulating plate in addition to the peripheral wall portions of the lower case and the upper case. The parts are also superposed and tend to have a multiple structure. Therefore, the gap between the overlapping surfaces at the bottom of the electrical junction box tends to be complicated, and coupled with the problem of the surface tension of water, the drainage structure through the gap has sufficient drainage performance. There was a risk that it could not be obtained.

JP 2001-186627 A

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is the insulation for electric circuit wiring in addition to the peripheral walls of one case and the other case at the lowermost part of the box body. It is an object of the present invention to provide an electrical junction box having a novel structure capable of realizing quick drainage with a simple structure in an electrical junction box mounted vertically with the outer peripheral edges of plates overlapped.

In the first aspect of the present invention, an insulating plate for wiring an electric circuit is housed inside a box body configured by superposing the peripheral wall portion of one case on the peripheral wall portion of the other case in an extrapolated state. The vertical mounting is performed so that the direction of assembly of the openings of the one case and the other case is substantially horizontal, so that the one case and the other case at the lowermost part of the box body. An electrical junction box in which each peripheral wall portion of the case and the outer peripheral edge portion of the insulating plate are overlapped, and extends toward both sides in the plate thickness direction at the outer peripheral edge portion of the insulating plate located at the lowermost part of the box body. While forming the outer peripheral wall part to be integrated,
In the peripheral wall portion of the one case located at the lowermost part of the box body, the distal end portion on the opening side is an extrapolated portion that is superimposed on the peripheral wall portion of the other case, and a drain hole is formed in the base end portion. And the outer peripheral wall portion of the insulating plate is overlapped with the middle portion thereof, and the outer peripheral wall portion of the insulating plate is provided with a drainage notch at the protruding tip edge on both sides in the plate thickness direction. It is characterized by having formed.

  According to this aspect, one case at the lowermost part of the box body and the peripheral wall portion of one case on the opening side of the peripheral wall portion of one case in the overlapping portion of the peripheral wall portion of the other case and the outer peripheral edge portion of the insulating plate, A drainage channel formed by a gap between overlapping surfaces of the extrapolated portion of the peripheral wall portion of the case and the peripheral wall portion of the other case is formed. The drainage channel communicates with the outside through an opening in the peripheral wall portion of one case. On the other hand, on the side opposite to the opening side of the peripheral wall portion of one case at the lowermost part of the box body, a drainage hole that opens to the outside is provided in the base end portion of the peripheral wall portion of one case. Yes. And the drainage notch is formed in the front-end edge part of the outer peripheral wall part of an insulating board in the site | part in which the intermediate part of the peripheral wall part of one case in the lowest part of a box main body is located. The drainage notch functions as a water flow passage and also advantageously exhibits a water collecting action. Further, since the drainage notch is provided, retention due to the surface tension of water can be advantageously avoided between the overlapping surfaces of the peripheral wall portion of one case and the outer peripheral wall portion of the insulating plate. Therefore, the water guided to the lowermost part of the box body is surely released to the outside through the drainage channel provided on the distal end side of the peripheral wall portion of one case and the drainage hole provided on the base end side thereof. Discharged. In addition, the water collected at the overlap between the peripheral wall portions of one case and the other case and the outer peripheral wall portion of the insulating plate is also drained by the notch for drainage, It is guided smoothly toward the drain hole on the base end portion side.

  Therefore, according to the first aspect, even if the lowermost portion of the box body has a multiple structure in which the peripheral wall portions of one case and the other case and the outer peripheral edge portion of the insulating plate are overlapped, the electrical connection The water that has entered the box is extremely efficient and reliable with a simple structure from the overlapping part of one case at the bottom of the box body and each peripheral wall part of the other case and the outer peripheral edge part of the insulating plate. It can be discharged.

  In addition, in the state where the insulating plate is vertically arranged so as to spread in the vertical direction within the box body of the electrical junction box, at the bottom of the box body, one of the outer peripheral wall portions extending on both sides in the plate thickness direction of the insulating plate A wide support surface (overlapping surface) made of a plate surface is stably positioned and supported with respect to the intermediate portion of the peripheral wall portion of one case.

  A second aspect of the present invention is the one described in the first aspect, wherein a drainage hole is formed in a proximal end portion of the peripheral wall portion of the other case located at the lowermost portion of the box body. .

  According to this aspect, the water guided to the lowermost part of the box body is formed in the drain hole formed in the base end portion of the peripheral wall portion of one case and the base end portion of the peripheral wall portion of the other case. It can be discharged to the outside through both drain holes. Thereby, further improvement in drainage performance can be realized.

  A third aspect of the present invention is the one described in the first or second aspect, provided in the outer peripheral wall portion of the insulating plate in the assembly direction of the one case and the other case. The drainage notch and at least one of the drainage holes provided in the one case and the other case are opposed to each other.

  According to this aspect, the distance between the drainage hole and the drainage notch can be sufficiently shortened. Therefore, the water inside the electrical junction box can be efficiently discharged using the drain hole and the drain notch.

  According to the present invention, the water that has entered the box body at the bottom of the box body of the insulating plate vertically disposed in the box body can be efficiently and reliably discharged to the outside with a very simple structure. It can be done.

It is a longitudinal cross-sectional view of the electrical junction box as 1st embodiment of this invention, Comprising: II sectional drawing of FIG. The A arrow directional view in FIG. The front view of the upper case which the electric junction box shown by FIG. 1 has. The rear view of the lower case which the electric junction box shown by FIG. 1 has. The front view of the insulating board which the electrical-connection box shown by FIG. 1 has. B arrow view in FIG. It is the elements on larger scale of FIG. The elements on larger scale corresponding to FIG. 7 which shows the principal part of other embodiment of this invention. The elements on larger scale corresponding to FIG. 7 which shows the principal part of other embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, in FIG. 1 and FIG. 2, as an embodiment of an electrical junction box having a structure according to the present invention, an electrical junction box 10 mounted in a passenger compartment or an engine room of an automobile has a longitudinal sectional view and a side view. And are shown schematically. As is clear from FIGS. 1 and 2, the electrical connection box 10 of this embodiment includes a box body 12 made of synthetic resin, a bus bar insulating plate 14 and a single-core wire insulating plate 16 housed in the box body 12. (Insulating plate for electric circuit wiring).

  More specifically, the box body 12 is configured by assembling an upper case 18 as one case and a lower case 20 as the other case, which are each formed into a rectangular opening box shape, on the opening side of each other. As shown in FIGS. 2 and 3, the upper case 18 integrally includes a long rectangular plate-shaped top plate portion 22 and a long rectangular frame-shaped peripheral wall portion 24 extending in the circumferential direction of the top plate portion 22. Have.

  The top plate portion 22 of the upper case 18 is provided with a plurality of connector mounting portions 26 in one region in the length direction (vertical direction in FIG. 3), while in the other region in the length direction. A plurality of fuse mounting portions 28 are provided. As shown in FIG. 1, in each connector mounting portion 26, a large number of press contact terminals 30 connected to a single core wire (not shown) wired to the single core wire insulating plate 16 penetrate the top plate portion 22. And it is projecting. Each fuse mounting portion 28 includes a number of press contact terminals 30 connected to a single core wire and a bus bar connection terminal portion 32, which will be described later, disposed on the bus bar insulating plate 14 so as to penetrate the top plate portion 22. , Has been projecting. A connector (not shown) attached to a terminal of an external electric wire such as a wire harness (not shown) is attached to each connector attachment portion 26, and the external electric wire is electrically connected to each press contact terminal 30. It has come to be. Each fuse mounting portion 28 is mounted with a fuse being electrically connected to the press contact terminal 30 of the single core wire or the connection terminal portion 32 of the bus bar. In FIGS. 1 and 2, reference numeral 34 denotes a cover that covers all of the fuse mounting portion 28. In addition, it should be understood that the cover 34 is omitted in FIG. 3 in order to facilitate understanding of the fuse mounting portion 28.

  As is apparent from FIG. 3, the peripheral wall portion 24 of the upper case 18 has a first side wall portion 25a extending in a direction perpendicular to the length direction (vertical direction in FIG. 3) of the upper case 18 (top plate portion 22). And the second side wall portion 25b, and the third side wall portion 25c and the fourth side wall portion 25d extending in the length direction of the upper case 18. As indicated by a broken line in FIG. 2, a rectangular engagement portion is provided at the central portion in the extending direction (left and right direction in FIG. 2) at the tip end portion (the end portion on the opening side of the upper case 18) of the first side wall portion 25 a. A notch 36 is provided. Moreover, the 1st lock part 39 and the 2nd lock part 40 are each integrally formed in the outer surface of the extending direction both sides part of the 1st side wall part 25a. The first lock portion 39 and the second lock portion 40 each have an engaging recess 38 that opens on the tip side of the first side wall portion 25a.

  A first lock portion 39 and a second lock portion 40 are integrally formed on the outer surfaces of both side portions of the second side wall portion 25b facing the first side wall portion 25a, respectively. The engaging recesses 38 are provided on the distal end side of the second side wall 25b. Further, although not shown in the drawing, the central portion in the extending direction (left-right direction in FIG. 3) at the tip of the second side wall 25b is also the same as the engagement notch 36 formed in the first side wall 25a. An engaging notch 36 is provided. The third side wall part 25c and the fourth side wall part 25d have two third lock parts 41 and four fourth lock parts 42 on the outer surfaces of both sides in the extending direction (vertical direction in FIG. 3). It is integrally formed. The third lock portion 41 and the fourth lock portion 42 are respectively provided with engagement recesses 38 that open on the tip side of the third side wall portion 25c and the step side wall portion 25d.

  Three drain holes 43, 43, and 43 are formed in the base end portion 37 opposite to the opening side of the first side wall portion 25a. Each of these drain holes 43 has the same size and the same rectangular shape extending from the base end portion 37 of the first side wall portion 25 a to the top plate portion 22. And these three drain holes 43, 43, 43 are the notches for engagement in the center part of the extending direction of the 1st side wall part 25a in the position spaced apart at equal intervals in the extending direction of the 1st side wall part 25a. The portions 36 are disposed at positions corresponding to the formation positions of the first lock portions 39 and 39 at both ends in the extending direction of the first side wall portion 25a. In addition, if the drain hole 43 provided in the upper case 18 is formed in the base end portion 37 of the first side wall portion 25a of the upper case 18, its specific formation position, number of formations, size, The shape and the like are not limited at all.

  On the other hand, as shown in FIG. 4, the lower case 20 integrally includes a top plate portion 44 having a long rectangular flat plate shape and a peripheral wall portion 45 having a long rectangular frame shape extending continuously in the circumferential direction of the top plate portion 44. In preparation. Each of the top plate portion 44 and the peripheral wall portion 45 of the lower case 20 has a size slightly smaller than the top plate portion 22 and the peripheral wall portion 24 of the upper case 18.

  Similarly to the top plate portion 22 of the upper case 18, the top plate portion 44 of the lower case 20 has a plurality of connector mounting portions 26 to which connectors of external wires such as a wire harness (not shown) are mounted, and a relay (not shown). Are provided with a plurality of relay mounting portions 29.

  The peripheral wall portion 45 of the lower case 20 includes a first side wall portion 46a and a second side wall portion 46b extending in a direction perpendicular to the length direction (vertical direction in FIG. 4) of the lower case 20 (top plate portion 44), and the lower case 20. The third side wall portion 46c and the fourth side wall portion 46d extend in the length direction. The first to fourth side wall portions 46 a to 46 d of the lower case 20 have a width (corresponding to an extending height extending in a direction perpendicular to the paper surface of FIG. 4), and the first to fourth side wall portions of the upper case 18. The width is made smaller than the width of 25a to 25d (corresponding to the extending height extending in the direction perpendicular to the paper surface of FIG. 3) by a predetermined dimension.

  A T-shaped projection 47 is integrally projected on the outer surface of the central portion in the extending direction (left-right direction in FIG. 4) of the first side wall 46a. The T-shaped projection 47 includes a T-shaped bottom portion 48 having a protruding tip side as a head portion, and an engagement frame portion 50 continuously extending in the circumferential direction along the outer peripheral edge portion of the bottom portion 48. Yes. In addition, a first engagement protrusion 52 and a second engagement protrusion 54 are formed integrally with each other on the outer surfaces of both ends in the extending direction of the first side wall 46a. The first engaging protrusion 52 has a long rectangular shape, and the second engaging protrusion 54 has a smaller T shape than the T-shaped protrusion 47. The T-shaped second engaging protrusion 54 has a T-shaped bottom portion 56 whose protruding tip side is a head portion, and an engaging frame portion 58 extending in the circumferential direction along the outer peripheral edge portion of the bottom portion 56. doing.

  Also on the outer surface of the second side wall 46b, there are one T-shaped protrusion 47, two first engaging protrusions 52, 52 and two second engaging protrusions 54, 54. They are integrally formed at the same position as the position on the one side wall 46a. The third side wall portion 46c and the fourth side wall portion 46d are provided on the outer surfaces of both end portions thereof in the extending direction (vertical direction in FIG. 4), with a third rectangular shape engaging protrusion 60 and an L-shaped first shape. Two four engaging protrusions 62 are integrally formed.

  The bottom 48 of the T-shaped protrusion 47 and the bottom 56 of the two second engaging protrusions 54 provided on the first side wall 46a of the lower case 20 are located at the base end side portions of the bottom 48, 56. One drainage hole 64 penetrating each other is formed. Each of these drain holes 64 has a circular shape of the same size. Thus, the three drain holes 64, 64, 64 are perpendicular to the extending direction of the first side wall portion 46a (the length direction of the top plate portion 44) with respect to the first side wall portion 46a of the lower case 20. In the direction) at equal intervals. Among these three drain holes 64, 64, 64, the distance between adjacent ones is the same among the three drain holes 43, 43, 43 provided in the first side wall portion 25 a of the upper case 18. It is substantially the same as the distance between adjacent things. In addition, the drain hole 64 provided in the 1st side wall part 46a of the lower case 20 is not essential in this invention. The shape and size of such drain holes 64, or the formation position and number of formation in the first side wall portion 46a are not limited at all. Moreover, it is also possible to provide the drain hole 64 directly with respect to the 1st side wall part 46a.

  On the other hand, as shown in FIG. 1, the bus bar insulating plate 14 accommodated in the box body 12 is formed using an insulating material such as a synthetic resin material, and as a whole, the top plate portion 22 of the upper case 18. It consists of a thin flat plate with a longitudinal rectangular shape that is slightly smaller than the other. A bus bar 66 is disposed on one surface of the bus bar insulating plate 14. The bus bar 66 is formed in a desired shape, for example, by stamping a metal thin flat plate.

  Further, the single-core wire insulating plate 16 accommodated in the box body 12 together with the bus bar insulating plate 14 is also formed using an insulating material such as a synthetic resin material, and as a whole, from the top plate portion 22 of the upper case 18. Is also composed of a flat plate with a small rectangular shape. As shown in FIG. 5, the single core wire insulating plate 16 has a plurality of holes and a plurality of protrusions and ribs protruding from both plate surfaces. Moreover, although not shown in figure, on both board surfaces of such a single core wire insulation board 16, a single core wire is wired with a predetermined pattern using the protrusions and ribs provided on each plate surface. Has been.

  As is clear from FIGS. 5 and 6, an outer peripheral wall 68 is integrally formed on the outer peripheral edge of the single core wire insulating plate 16 so as to protrude on both sides in the plate thickness direction. The outer peripheral wall portion 68 is integrally formed so as to protrude from the outer peripheral edge portion of the single core wire insulating plate 16 to both sides in the plate thickness direction at the same height and continuously extend in the circumferential direction. Yes. That is, the outer peripheral wall portion 68 as a whole has a long rectangular frame shape corresponding to the single core wire insulating plate 16, and extends in a direction perpendicular to the longitudinal direction of the single core wire insulating plate 16. 70a and a second wall portion 70b, and a third wall portion 70c and a fourth wall portion 70d that extend in the length direction of the single core wire insulating plate 16. And these 1st-4th wall parts 70a-70d are each integrated with respect to the four side surfaces of the single core wire insulation board 16 in the center part of the width direction.

  Three drainage cutouts 72 are provided on both side portions in the width direction of the first wall portion 70a of the outer peripheral wall portion 68, that is, on the projecting tip edge portions on both sides in the plate thickness direction of the single core wire insulating plate 16. It has been. These drainage notches 72 have the same semicircular shape having a relatively small diameter. And in the width direction both sides site | part of the 1st wall part 70a, it forms one each in the center part of the extension direction of the 1st wall part 70a, and the both sides site | part of the extension direction. Here, the distance between the two drainage notches 72 and 72 adjacent to each other in the length direction of the first wall 70a is between the drainage holes 43 provided in the first side wall 25a of the upper case 18. The distance is the same.

  1 and 2, the first side wall portions 25a and 46a of the peripheral wall portions 24 and 45 of the upper case 18 and the lower case 20 are on the lower side, and the second side wall portions 25b and 46b are on the upper side. And the first and second side wall portions 25a, 46a, 25b, and 46b are arranged so as to expand in the horizontal direction, and the peripheral wall portion 24 of the upper case 18 has a tip on the opening side thereof. The entire circumference of the side portion is extrapolated to the peripheral wall portion 45 from the opening side of the peripheral wall portion 45 of the lower case 20. As a result, the upper case 18 and the lower case 20 are superposed on each other at the peripheral wall portions 24 and 45, and are vertically mounted so that the assembling direction thereof is the horizontal direction. Thus, the box body 12 is formed as an assembly of the upper case 18 and the lower case 20.

  As shown in FIGS. 1, 2, and 7, in the box body 12, the first side wall portions 25 a and 46 a of the peripheral wall portions 24 and 45 of the upper case 18 and the lower case 20 are disposed at the lowermost portion. Are superimposed on each other. In addition, the opening end portion of the first side wall portion 25 a of the upper case 18 positioned at the lowermost portion of the box body 12 is an extrapolated portion 74 that is extrapolated to the first side wall portion 46 a of the lower case 20. Furthermore, a housing space extending in the vertical direction is formed between the opposing surfaces of the top plate portions 22 and 44 of the upper case 18 and the lower case 20 inside the box body 12.

  Further, when the upper case 18 and the lower case 20 are assembled with each other, the lower case 20 is inserted into the engagement notches 36 and 36 provided in the first and second side wall portions 25a and 25b of the upper case 18. The leg portions of the T-shaped projections 47, 47 provided on the first and second side wall portions 46a, 46b are respectively inserted. Further, the first and second portions provided on the first and second side wall portions 46a and 46b of the lower case 20 in the engaging recesses 38 provided on the first and second side wall portions 25a and 25b of the upper case 18, respectively. Engagement protrusions 52 and 54 are respectively fitted and inserted. Further, the third and fourth side wall portions 46c of the lower case 20 are placed in the engaging recesses 38 of the third and fourth lock portions 41, 42 provided on the third and fourth side wall portions 25c, 25d of the upper case 18. , 46d, the third and fourth engaging projections 60, 62 are respectively fitted and inserted. The T-shaped projections 47 and the engagement frame portions 50 and 58 of the first engagement projections 52 are engaged with the inner peripheral surfaces of the respective engagement notches 36 and the respective engagement recesses 38. Further, the second to fourth engagement protrusions 54, 60, 62 are engaged with the inner peripheral surface of the engagement recess 38 of each of the second to fourth lock portions 40, 41, 42.

  As a result, the upper case 18 and the lower case 20 are reliably assembled in a state where they are positioned at predetermined positions in the circumferential direction, the vertical direction, and the horizontal direction, respectively. Further, the three drain holes 43, 43, 43 provided in the first side wall portion 25a of the upper case 18 and the three drain holes 64, 64, 64 provided in the first side wall portion 46a of the lower case 20 are: Assembling direction of the upper case 18 and the lower case 20 (opposite the top plate portion 22 of the upper case 18 and the top plate portion 44 of the lower case 20) at the overlapping portion of the two first side wall portions 25a, 46a in the box body 12. (Direction) at a predetermined interval and open to the outside. Thus, the accommodation space in the box body 12 is communicated to the outside through the drain holes 43 and 64.

  As shown in FIG. 1, the bus bar insulating plate 14 and the single-core wire insulating plate 16 are housed in a fixed position in the housing space of the box body 12 that is an assembly of the upper case 18 and the lower case 20. ing.

  That is, the bus bar insulating plate 14 and the single-core wire insulating plate 16 are located within a predetermined distance from the top case portions 22 and 44 of the upper case 18 and the lower case 20 with the former positioned on the upper case 18 side in the box body 12. It is arranged so as to extend in the up-down direction with facing each other. Further, under such an arrangement state, the first wall portion 70a of the outer peripheral wall portion 68 of the single core wire insulating plate 16 is positioned on the lower side, and the second wall portion 70b is positioned on the upper side. Then, under the arrangement of the single core wire insulating plate 16 in the box body 12, the first wall portion 70 a extends from the outer peripheral edge of the single core wire insulating plate 16 to both sides in the assembly direction of the upper case 18 and the lower case 20. It is arranged at the lowermost part of the box body 12 in a state of extending in the direction.

  And as FIG. 7 shows, the 1st wall part 70a of the single core wire insulation board 16 is between the external insertion part 74 and the base end part 37 of the 1st side wall part 25a of the upper case 18 in the outer surface. It is superimposed on the intermediate part 76 located. In this state, the outer peripheral wall portion 68 of the single core wire insulating plate 16 is sandwiched between the peripheral wall portion 24 of the upper case 18 and the peripheral wall portion 45 of the lower case 20 from both sides in the horizontal direction. Further, the outer peripheral edge portion of the bus bar insulating plate 14 is sandwiched between the peripheral wall portion 24 and the outer peripheral wall portion 68 between the peripheral wall portion 24 of the upper case 18 and the outer peripheral wall portion 68 of the single core wire insulating plate 16. Is placed. As a result, the bus bar insulating plate 14 and the single core wire insulating plate 16 are sandwiched between the upper case 18 and the lower case 20 in a state of being positioned in the housing space of the box body 12.

  In this case, the first wall portion 70a of the outer peripheral wall portion 68 of the single-core wire insulating plate 16 that is overlapped with the first side wall portion 25a of the upper case 18 positioned at the lowermost portion of the box body 12 is relatively small. Six drainage notches 72 having an opening area are formed. The six drainage cutouts 72 are positioned so as to face each other between the drain holes 43 and 64 provided in the upper case 18 and the lower case 20 in the assembling direction of the upper case 18 and the lower case 20, respectively. Is arranged. As a result, the distance between each drainage hole 43, 64 and each drainage notch 72 corresponding to each other in the assembly direction of the upper case 18 and the lower case 20 is sufficiently shortened.

  Thus, at the overlapping portion of the first side wall portion 25a of the upper case 18 located at the lowermost portion of the box main body 12 and the first wall portion 70a of the single-core wire insulating plate 16, they gathered at the lowermost portion of the box main body 12. A drainage channel for guiding water to the drainage holes 43 and 64 of the upper case 18 and the lower case 20 is located in the drainage notches 72 and between the drainage notches 72 to the drainage holes 43 and 64. The first side wall portions 25a and the first side wall portions 46a of the lower case 20 are formed.

  Therefore, in the electrical junction box 10 of the present embodiment, the water that has entered the box body 12 and led to the lowermost part of the box body 12 is provided on the first wall portion 70a of the single-core wire insulating plate 16. Further, the drainage holes 43 and 64 provided in the first side wall portions 25a and 46a of the upper case 18 and the lower case 20 can be efficiently collected in each drainage notch 72, or the water can be prevented from staying by relaxing the surface tension. It can be discharged to the outside smoothly.

  Therefore, in the electrical junction box 10 of this embodiment as described above, the lowermost portion of the box body 12 is the peripheral wall portions 24 and 45 of the upper case 18 and the lower case 20 and the outer peripheral wall portion 68 of the single core wire insulating plate 16. However, the water that has entered the box body 12 can be discharged very efficiently and quickly. Thereby, the adverse effect on the electric circuit due to the water entering the box body 12 can be effectively avoided.

  In the present embodiment, the single core wire insulating plate 16 accommodated in the box body 12 has the upper case 18 on the outer surface of the first wall portion 70a of the outer peripheral wall portion 68 extending from the outer peripheral edge portion to both sides in the plate thickness direction. Are overlapped with the first side wall portion 25a of the peripheral wall portion 24. Further, the outer peripheral wall portion 68 of the single core wire insulating plate 16 is sandwiched between the peripheral wall portions 24 and 45 of the upper case 18 and the lower case 20. Therefore, the single core wire insulating plate 16 can be reliably disposed in a state where it is stably positioned at a predetermined position in the box body 12.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, it is not always necessary to provide the drainage hole 64 formed through the peripheral wall portion 45 of the lower case 20, as shown in FIG. 8, in the overlapping portion of the two first side wall portions 25 a and 46 a in the box body 12, In parts other than the formation part of the drain holes 43 and 64, the outer insertion part 74 which consists of the front-end | tip part of the 1st side wall part 25a of the upper case 18, and the base end part of the 1st side wall part 46a of the lower case 20 (in FIG. 8, The water inside the box body 12 may be discharged to the outside through a drainage groove formed by a gap 78 formed between the overlapping surfaces with the first engagement protrusions 52).

  Further, in place of or in addition to the single-core wire insulating plate 16, when the outer peripheral wall portion having the same structure as the outer peripheral wall portion 68 of the single-core wire insulating plate 16 is integrally formed on the bus bar insulating plate 14, A drainage notch is formed on the first wall portion of the outer peripheral wall portion of the bus bar insulating plate 14 (the wall portion positioned at the lowermost position in the box body 12 and superimposed on the first side wall portion 25a of the peripheral wall portion 24 of the upper case 18). 72 may be provided. That is, if the drainage notch is provided at the protruding end edge of the outer peripheral wall protruding from the outer peripheral edge of the electric circuit wiring insulating plate to both sides in the plate thickness direction, the electric circuit wiring to be formed The kind and structure of the insulating plate for use are not particularly limited.

  Further, the position and number of drainage cutouts at the protruding tip edge of the outer peripheral wall portion of the electric circuit routing insulating plate, or the size and shape of the drainage cutouts are not limited at all. For example, as shown in FIG. 9, an opening is formed in the outer peripheral surface of the outer peripheral wall portion 68 between the pair of drainage cutouts 72, 72 provided to face each other in the width direction of the outer peripheral wall portion 68. A communication groove 80 may be formed, and the pair of drainage notches 72 and 72 may be communicated with each other via the communication groove 80. Thereby, the drainage efficiency between the superposed surfaces of the outer peripheral wall portion 68 and the peripheral wall portion 24 of the upper case 18 can be further improved. That is, the drainage notch has a groove shape extending toward the line end edge and a hole shape penetrating the protruding tip edge portion with respect to the protruding tip edge portion of the outer peripheral wall portion of the electric circuit wiring insulating plate. You may have.

  Further, the outer peripheral wall portion 68 formed integrally with the single core wire insulating plate 16 and the bus bar insulating plate 14 has a structure that can be overlapped with the first side wall portion 25a of the peripheral wall portion 24 of the upper case 18 at the lowermost portion of the box body 12. It only has to have. Therefore, if such a condition is satisfied, the outer peripheral wall portion 68 is intermittently formed at a plurality of locations in the circumferential direction with respect to the outer peripheral edge portion of the single core wire insulating plate 16 or the bus bar insulating plate 14. Or may be formed only at one location on the periphery of the outer peripheral edge.

10: Electrical junction box, 12: Box body, 14: Bus bar insulation plate, 16: Single core insulation plate (insulation plate for electrical circuit wiring), 18: Upper case (one case), 20: Lower case (the other case) Case), 24, 45: peripheral wall portion, 43, 64: drainage hole, 68: outer peripheral wall portion, 72: notch for drainage, 74: extrapolation portion, 78: gap (drainage hole)

Claims (3)

An insulating plate for wiring an electric circuit is housed inside a box body configured by superposing the peripheral wall portion of one case on the peripheral wall portion of the other case in an extrapolated state, and the one case and the other case The case is vertically mounted so that the mounting direction of the openings of the case is substantially horizontal, so that the peripheral wall of the one case, the other case, and the insulating plate at the bottom of the box body An electrical junction box in which the outer peripheral edges of the
While integrally forming an outer peripheral wall portion extending toward both sides in the plate thickness direction at the outer peripheral edge portion of the insulating plate located at the lowermost portion of the box body,
In the peripheral wall portion of the one case located at the lowermost part of the box body, the distal end portion on the opening side is an extrapolated portion that is superimposed on the peripheral wall portion of the other case, and a drain hole is formed in the base end portion. And overlying the outer peripheral wall portion of the insulating plate on the middle portion thereof,
A drainage notch is formed in the outer peripheral wall of the insulating plate at the protruding leading edge on both sides in the thickness direction.   The electrical junction box according to claim 1, wherein a drainage hole is formed in a proximal end portion of the peripheral wall portion of the other case located at the lowermost part of the box body.   In the assembly direction of the one case and the other case, at least one of a drainage notch provided in the outer peripheral wall portion of the insulating plate and a drainage hole provided in the one case and the other case The electrical junction box according to claim 1 or 2, wherein are opposed to each other.

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