JP5626703B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box for automobiles, and more particularly to an electrical junction box having a structure for preventing water from entering the interior of the electrical junction box.

  Conventionally, an electric connection box such as a fuse box, a relay box, or a junction box is mounted in a proper place in a vehicle compartment or an engine room of an automobile. In such an electrical connection box, for example, as described in Japanese Patent Application Laid-Open No. 2005-229740 (Patent Document 1), a rectangular box body in which the peripheral wall of the inner fitting case is fitted and combined with the peripheral wall of the outer fitting case In addition, a structure having an energization circuit member composed of a printed circuit board, a bus bar or the like is known.

  Incidentally, it is necessary to prevent water from entering the inside of the electrical junction box because it causes a short circuit of the energizing circuit member. In this regard, in the electrical junction box having the structure as described in Patent Document 1, the box body that accommodates the energizing circuit member is fitted into the peripheral wall of the outer fitting case and the overlapping surface of the peripheral walls. Since it is structured to be fitted and fixed by a lock fitting portion or the like provided therebetween, there is a concern that water may enter the inside from the opening or the like of the lock fitting portion. On the other hand, it is conceivable to adopt a waterproof structure such as a seal rubber to ensure waterproofness, but especially in an electrical junction box arranged in the passenger compartment, there is little risk of getting wet. A simpler and cheaper waterproof structure is desired.

  Therefore, such an electrical junction box is installed vertically so that the combination direction of each case is horizontal, and the lock fitting portion is opened in the horizontal direction, so that water dripped from above can enter. It has been proposed to prevent.

  However, if the electrical junction box is simply placed vertically, the water dripped from above travels around the peripheral wall of the outer fitting case and wraps around the opening of the lock fitting part, or overlaps the peripheral walls of each case. There has been a problem that water enters into the case due to capillarity or the like between the peripheral walls that overlap and overlap each other.

  In addition, JP 2008-61401 A (Patent Document 2) proposes an electric junction box having a structure for draining water that has entered inside from between the overlapping surfaces of the peripheral walls of each case to the outside of the case. ing. That is, as shown in FIG. 2 of Patent Document 2, in this electrical junction box, the peripheral wall of the outer fitting case has a double structure of the outer wall and the inner wall, and a drainage hole is formed in the bottom surface of the outer fitting case. The inner wall is inclined toward the drain hole. Then, by inserting the peripheral wall of the inner fitting case between the outer wall and the inner wall of the outer fitting case, water that has entered from between the overlapping surfaces of the outer wall of the outer fitting case and the peripheral wall of the inner fitting case causes the inclined inner wall to It is structured to be quickly discharged from the drain hole.

  However, in the structure of the electrical junction box described in Patent Document 2, water eventually enters the interior from between the overlapping surfaces of the outer wall of the outer fitting case and the peripheral wall of the inner fitting case. Therefore, due to the capillary phenomenon between the overlapping surfaces of the peripheral walls, water may remain in the case without being guided to the drain hole, or water may be guided to the inside of the case through other parts of the inner wall. The waterproof effect could not be expected.

JP 2005-229740 A JP 2008-61401 A

  The present invention has been made in the background as described above, and the problem to be solved is that, in an electrical connection box mounted vertically, between the overlapping surfaces of the peripheral wall of the outer fitting case and the peripheral wall of the inner fitting case. Another object of the present invention is to provide an electrical junction box having a novel structure that can advantageously prevent water from entering the inside of the box body from a lock fitting portion or the like provided therebetween. .

According to a first aspect of the present invention, there is provided an electrical junction box in which an energizing circuit member is housed in a rectangular box body in which the peripheral wall of the inner fitting case is fitted and combined with the peripheral wall of the outer fitting case. combinations direction of the inner fitting case is vertically置装wear in the state where the horizontal direction, the said outer fitting upper portion of the case which is located above in the vertical置装deposition states, the outer periphery of the upper portion peripheral wall of the outer fitting case A flange portion is formed on the surface so as to be opposed to each other with a gap, and the flange portion extends beyond the open end edge of the upper partial peripheral wall of the outer fitting case to the upper side of the inner fitting case. In addition, in the upper portion of the outer fitting case, the flange portion extends over the entire width direction of the upper peripheral wall of the outer fitting case that is in a direction orthogonal to the combination direction , and the upper surface of the flange portion is the outer fitting case. width direction of the upper portion of the peripheral wall In which is an inclined surface lower portion of the outer fitting case toward the end portion is inclined downwardly to the position, and, in the end portion in the width direction of the eaves section, the return portion inclined upwardly It is integrally formed, and the base end side of the return portion is an inclined surface that inclines toward the base end side of the upper portion of the outer fitting case .

  In this aspect, a flange is formed on the upper portion of the outer fitting case positioned above in the vertically mounted state, and this flange covers the entire opening between the overlapping surfaces of the case peripheral walls from above. ing. Moreover, the upper surface of this collar part is made into the inclined surface which inclines below toward the edge part of the circumferential direction of an outer fitting case. Thereby, in the electrical connection box mounted vertically, when a liquid such as water is dropped from above, the water or the like adhering to the upper surface of the buttock flows down in the inclined direction of the upper surface of the buttock, Is prevented from reaching the opening between the overlapping surfaces of the peripheral walls of each case. Therefore, it is possible to reliably prevent water or the like from entering the inside of the electrical junction box between the overlapping surfaces of the peripheral walls of each case or the opening of the lock fitting portion provided there.

In the electrical connection box according to a first aspect of the present invention, the end that put in the width direction of the eaves section, together with the return portion inclined upward is integrally formed,該返and part of the group The aspect by which the end side is made into the inclined surface which inclines toward the base end side of the said upper part of the said external fitting case is employ | adopted.

  According to this aspect, the overlapping surfaces of the peripheral walls are inclined by the inclined surface on the proximal end side of the return portion while blocking water or the like guided to the circumferential end by the inclination of the upper surface of the flange portion by the return portion. It can guide to the bottom wall part side of the external fitting case far from the opening part in between. Thereby, it is possible to more reliably prevent water from entering the inside of the electrical junction box.

According to a second aspect of the present invention, in the electrical junction box according to the first aspect, an outer peripheral surface of a peripheral wall of the inner fitting case in an upper portion of the inner fitting case positioned above in the vertically mounted state. A cover wall portion is formed oppositely with a gap therebetween and extending toward the outer fitting case, and an extended end portion of the cover wall portion is formed between the peripheral wall of the outer fitting case and the flange. The opening end edge portion of the peripheral wall of the outer fitting case is inserted between the peripheral wall of the inner fitting case and the cover wall portion.

  According to this aspect, the opening portion between the overlapping surfaces of the peripheral walls of each case can be covered from the outside in the assembling direction (horizontal direction) by the cover wall portion, and water can be more reliably entered between the overlapping surfaces. Can be prevented. In addition, the collar part, cover wall part, peripheral wall of the outer fitting case, and peripheral wall of the inner fitting case are overlapped in multiple layers, and even if water goes around the extended end part of the collar part, it goes to the inside. This makes it possible to prevent the water from reaching the inside of the electrical junction box.

According to a third aspect of the present invention, in the electrical junction box described in the first or second aspect, the upper portion of the inner fitting case is tapered toward the bottom wall portion of the inner fitting case. A surface is formed, and the flange extends to above the tapered surface.

  According to this aspect, when water flows down on the inner fitting case from the extending end portion of the flange portion, the water is quickly flowed downward through the tapered surface. Thereby, the water that flows down on the inner fitting case is kept away from the opening between the overlapping surfaces of the peripheral walls of each case, and the water reaches the opening of each case and enters the inside of the electrical junction box. It is surely prevented.

  According to the electrical connection box according to the present invention, in the electrical connection box mounted in a vertical state, the hook portion having an inclination is formed on the upper portion of the outer fitting case, so that the electrical connection box has fallen on the electrical connection box from above. The water can be received by the collar and guided away from the opening between the overlapping surfaces of the peripheral walls of each case. Thereby, the penetration | invasion of the water to the inside of the electrical junction box from between the overlapping surfaces of the surrounding wall of each case can be prevented.

The perspective view which shows the electrical junction box as one Embodiment of this invention. The expanded II-II sectional drawing in FIG. The enlarged back view which shows the principal part of the internal fitting case shown in FIG. The enlarged left view which shows the principal part of the internal fitting case shown in FIG. The enlarged front view which shows the principal part of the external fitting case shown in FIG. The expanded left view which shows the principal part of the external fitting case shown in FIG.

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

  First, FIG. 1 shows the entire electrical junction box 10 as an embodiment of the present invention, and FIG. 2 shows only the main part of the electrical junction box 10 in an enlarged manner. The electrical connection box 10 has a current-carrying circuit member made of a known printed circuit board (not shown) in a hollow rectangular box body 16 formed by combining an outer fitting case 12 and an inner fitting case 14 formed of synthetic resin. Contained structure. The outer fitting case 12 and the inner fitting case 14 have peripheral walls 18 and 20, respectively. As shown in FIG. 2, the peripheral wall 20 of the inner fitting case 14 is fitted into the peripheral wall 18 of the outer fitting case 12. The outer fitting case 12 and the inner fitting case 14 are combined with each other in the left-right direction in FIG. 2 to form a rectangular box body 16. Such an electrical junction box 10 is disposed in the interior of the automobile or the like so that the vertical direction in FIG. 1 is the vertical direction. That is, the electrical connection box 10 of this embodiment is vertically mounted so that the combination direction of the outer fitting case 12 and the inner fitting case 14 is a horizontal direction. In the following description, unless otherwise specified, “upper” means the upper side in FIG. 1, and “lower” means the lower side in FIG.

  3 and 4, as an essential part of the inner fitting case 14, an enlarged upper portion 22 positioned on the upper side in the vertically mounted state of the electrical connection box 10 is shown. The inner fitting case 14 includes a bottom wall portion 24 having a substantially longitudinal rectangular plate shape, and a peripheral wall 20 extending from the outer peripheral edge portion of the bottom wall portion 24 toward the side (left side in FIG. 4). . As shown in FIG. 1, a plurality of fuse mounting portions 26 and relay mounting portions 28 are formed in the bottom wall portion 24 of the inner fitting case 14 so that a fuse and a relay (not shown) are respectively mounted. It has become. In addition, a plurality of terminal insertion holes 32 are provided on the bottom surfaces of the fuse mounting portions 26 and the relay mounting portions 28 so as to pass through the bottom wall portion 24 of the inner fitting case 14, so that connection of energization circuit members (not shown) is performed. Terminals are inserted and arranged.

  The peripheral wall 20 of the inner fitting case 14 extends in a rectangular cylindrical shape from the four end edges of the bottom wall portion 24 having a long rectangular shape. When the electric connection box 10 is vertically mounted, the electric connection box 10 The upper peripheral wall 20a, the lower peripheral wall 20b, the right peripheral wall 20c, and the left peripheral wall 20d are arranged on the top, bottom, left, and right, respectively. In the following description, when it is not necessary to distinguish these upper peripheral wall 20a, lower peripheral wall 20b, right peripheral wall 20c, and left peripheral wall 20d, these upper peripheral wall 20a, lower peripheral wall 20b, right peripheral wall 20c, left side The whole composed of the peripheral wall 20d will be described as the peripheral wall 20.

  A plurality of engaging protrusions 34 that protrude outward from the outer surface of the peripheral wall 20 are integrally formed on the outer surface of the peripheral wall 20 at appropriate positions separated from each other in the circumferential direction. Further, on the outer surface of the upper peripheral wall 20a, an engagement protrusion 36 is provided that extends toward the outer fitting case 12 in parallel with the upper peripheral wall 20a at a position protruding outward from the outer surface of the upper peripheral wall 20a.

  A cover wall 40 is integrally formed on the outer surface of the peripheral wall 20 of the inner fitting case 14 over substantially the entire circumference in the circumferential direction other than the positions where the engagement protrusions 34 and the engagement protrusions 36 are formed. For example, the cover wall portion 40 formed on the outer peripheral surface of the upper peripheral wall 20a shown in FIG. 2 is disposed to face the outer peripheral surface of the upper peripheral wall 20a with a gap, and does not reach the opening edge of the peripheral wall 20. It extends toward the outer fitting case 12 side to the position. As is apparent from this, in the present embodiment, the upper portion 22 of the inner fitting case 14 includes the upper peripheral wall 20a of the inner fitting case 14 and the cover wall portion 40. Note that the cover wall portions 40 provided on the lower peripheral wall 20b, the right peripheral wall 20c, and the left peripheral wall 20d also have substantially the same structure as the cover wall portion 40 provided on the upper peripheral wall 20a. Further, at the corner portion of the peripheral wall 20, the cover wall portion 40 is bent and provided so as to cover the entire corner portion.

  As shown in FIG. 1, in the cover wall portion 40, both end portions in the circumferential direction of the cover wall portion 40 extending in the circumferential direction of the inner fitting case 14 are connected to the peripheral wall 20 by side end wall portions 42. In addition, a base end side portion of the cover wall portion 40 on the bottom wall portion 24 side of the inner fitting case 14 is also connected to the peripheral wall 20 by the base end wall portion 44. Thereby, the cover wall part 40 is made into the door-bag-like structure, and the penetration | invasion of the water to the inner side area | region of the cover wall part 40 is prevented. Further, as shown in FIG. 3, support ribs 46 are provided at appropriate positions in the circumferential direction of the inner fitting case 14 inside the cover wall portion 40, and the cover wall portion 40 is supported from the inside.

  Further, the cover wall portion 40 formed on the upper peripheral wall 20 a of the inner fitting case 14 and the corners on both ends in the circumferential direction of the upper peripheral wall 20 a is provided with a tapered surface 48 at the upper corner portion of the base end wall portion 44. ing. On the other hand, in each cover wall part 40 provided in the lower peripheral wall 20b, the right peripheral wall 20c, and the left peripheral wall 20d of the inner fitting case 14, the base end wall part 44 is a wall surface extending vertically from the peripheral wall 20. . Thereby, in the inner fitting case 14 of this embodiment, the taper surface 48 which inclines toward the bottom wall part 24 of the inner fitting case 14 is formed only in the upper part 22.

  5 and 6, as an essential part of the outer fitting case 12, an upper portion 50 of the outer fitting case 12 positioned above in the vertically mounted state of the electrical connection box 10 is shown enlarged. The outer fitting case 12 includes a bottom wall portion 52 having a substantially longitudinal rectangular plate shape that is substantially the same size as the bottom wall portion 24 of the inner fitting case 14, and a lateral side from the outer peripheral edge of the bottom wall portion 52 (FIG. 6). And a peripheral wall 18 extending toward the right side. Similar to the peripheral wall 20 of the inner fitting case 14, the peripheral wall 18 of the outer fitting case 12 extends in a rectangular cylindrical shape from the four end edges of the bottom wall portion 52 having a long rectangular shape toward the inner fitting case 14 side. In the vertically mounted state of the electrical connection box 10, the upper peripheral wall 18a, the lower peripheral wall 18b, the right peripheral wall 18c, and the left peripheral wall 18d are arranged on the top, bottom, left, and right of the electrical connection box 10, respectively. In the following description, when it is not necessary to distinguish these upper peripheral wall 18a, lower peripheral wall 18b, right peripheral wall 18c, and left peripheral wall 18d, these upper peripheral wall 18a, lower peripheral wall 18b, right peripheral wall 18c, left side The whole composed of the peripheral wall 18 d will be described as the peripheral wall 18 of the outer fitting case 12. The peripheral wall 18 of the outer fitting case 12 has a sufficiently large extension dimension compared to the peripheral wall 20 of the inner fitting case 14, and inside the box body 16 that combines the inner fitting case 14 and the outer fitting case 12, An accommodation space sufficient to accommodate an energization circuit member (not shown) is configured.

  On the outer surface of the peripheral wall 18 of the outer fitting case 12, an engaging lock portion 54 and an engaging groove portion 56 are provided at positions corresponding to the engaging protrusions 34 and the engaging protruding pieces 36 provided on the peripheral wall 20 of the inner fitting case 14. Each is integrally formed. Although detailed illustration is omitted, the engagement lock portion 54 has a structure in which a part of the peripheral wall 18 slightly protrudes outward, and a recess (not shown) that opens to the inner peripheral side of the peripheral wall 18 is formed. Has been. And the lock fitting part 58 is comprised because the outer peripheral surface of the engaging protrusion 34 of the inner fitting case 14 engages with this recessed part, and the outer fitting case 12 and the inner fitting case 14 are fitted in a positioning state. It has come to be. Further, the engaging groove 56 is a groove that is large enough to accommodate the engaging protrusion 36 of the inner fitting case 14 and opens toward the opening of the outer fitting case 12. On the other hand, the positioning protrusion 60 is configured by inserting the engaging protrusion 36. Further, a plurality of connector mounting portions 61 are formed in the bottom wall portion 52 of the outer fitting case 12 so that a connector (not shown) is mounted. A plurality of terminal insertion holes 62 are provided on the bottom surface of the connector mounting portion 61 so as to penetrate the bottom wall portion 52 of the outer fitting case 12 so that connection terminals of an energization circuit member (not shown) are inserted and arranged. It has become. Further, a harness fixing portion 63 and a bracket mounting portion 64 are integrally projected at appropriate positions on the peripheral wall 18 of the outer fitting case 12.

  The upper portion 50 of the outer fitting case 12 is integrally formed with a collar portion 68 that is opposed to the outer peripheral surface of the upper peripheral wall 18a with a gap. As shown in FIG. 2, the flange 68 extends toward the inner fitting case 14 beyond the opening edge of the peripheral wall 18 of the outer fitting case 12, and the outer fitting case 12, the inner fitting case 14, In the overlapped state, the flange portion 68 extends to a position reaching the upper portion of the tapered surface 48 of the upper portion 22 of the inner fitting case 14. Further, as shown in FIG. 5, the flange portion 68 extends over the entire circumferential direction of the upper peripheral wall 18 a above the upper peripheral wall 18 a that extends in the circumferential direction (left and right direction in FIG. 5) of the outer fitting case 12. As is apparent from this, in the present embodiment, the upper portion 50 of the outer fitting case 12 includes the upper peripheral wall 18a and the flange portion 68 of the outer fitting case 12.

  Although the thickness dimension of the collar part 68 is substantially constant, the collar part 68 has a right part and a left part in the front view shown in FIG. The whole is slightly inclined by the angle α shown in FIG. Thereby, the upper surface of the collar part 68 is made into the inclined surface 70 which inclines below by substantially angle (alpha) toward both ends in the circumferential direction of the external fitting case 12. FIG.

  Due to such an inclination, return portions 72 are integrally formed at both ends in the circumferential direction of the collar portion 68 which is the lowermost side of the collar portion 68. The return portion 72 includes a protruding portion 74 that protrudes while being inclined upward, and a flat portion 76 on the front side in the circumferential direction. As shown in FIG. 6, the return portion 72 is formed only on the extending distal end side of the flange portion 68 at the circumferential end portion of the flange portion 68, and the proximal end side of the return portion 72 is the outer fitting case 12. The inclined surface 78 is inclined toward the base end side of the upper portion 50. Thereby, the base end side of the return part 72 is made into the structure where the whole was connected with the upper side surrounding wall 18a smoothly.

  Three protruding ribs 80 extending from the bracket mounting portion 64 to the upper surface of the flange portion 68 are provided on the upper surface of the flange portion 68, whereby the flange portion 68 is reinforced. The protruding rib 80 is formed at a position avoiding the upper portion of the engaging lock portion 54 and the engaging groove portion 56, so that the protruding rib 80 is formed in the combined state of the inner fitting case 14 and the outer fitting case 12. It is located above the tapered surface 48 of the inner fitting case 14.

  Further, as shown in FIG. 6, the peripheral wall 18 of the outer fitting case 12 has an opening edge of the peripheral wall 18 at both sides in the circumferential direction of the engagement protrusion 34 and the engagement protrusion 36, or at appropriate positions in the circumferential direction of the peripheral wall 18. A plurality of notches 82 are provided on the side of the portion. Each notch portion 82 corresponds to the side end wall portion 42 and the support rib 46 of each cover wall portion 40 provided on the peripheral wall of the inner fitting case 14 in the overlapped state of the outer fitting case 12 and the inner fitting case 14. Each notch 82 is formed with a depth dimension substantially the same as the extended length of the cover wall 40. As a result, the opening edge of the peripheral wall 18 of the outer fitting case 12 is divided into a plurality of opening pieces 84 by providing such a notch 82.

  For example, the outer fitting case 12 and the inner fitting case 14 are combined with each other as follows to form the electrical junction box 10. That is, first, an energizing circuit member made of a printed circuit board (not shown) is accommodated inside the peripheral wall 18 of the outer fitting case 12. Next, the tips of the engagement protrusions 36 of the inner fitting case 14 constituting the positioning portion 60 are inserted into the respective engaging groove portions 56 of the outer fitting case 12, and the outer fitting case 12 and the inner fitting case 14 are connected. Position each other. Thereby, in the projection in a front view, the entire peripheral wall 20 of the inner fitting case 14 is correctly positioned inside the peripheral wall 18 of the outer fitting case 12. When the inner fitting case 14 is further pushed into the outer fitting case 12 in this state, the peripheral wall 20 of the inner fitting case 14 is accommodated in the outer fitting case 12 in a state of being superimposed on the inner side of the peripheral wall 18 of the outer fitting case 12. Thus, the inner fitting case 14 and the outer fitting case 12 are combined.

  At this time, as shown in FIG. 2, the extended end portion of the cover wall portion 40 formed on the upper portion 22 of the inner fitting case 14 is fitted between the upper peripheral wall 18 a of the outer fitting case 12 and the flange portion 68. Can be put. Further, the opening edge of the upper peripheral wall 18 a of the outer fitting case 12 is fitted between the upper peripheral wall 20 a of the inner fitting case 14 and the cover wall portion 40. That is, in the upper part of the electrical connection box 10, in order from the upper side, the flange portion 68 of the outer fitting case 12, the cover wall portion 40 of the inner fitting case 14, the upper peripheral wall 18a of the outer fitting case 12, and the upper peripheral wall of the inner fitting case 14 20a overlaps each other. Thereby, the opening edge part of the upper peripheral wall 18a of the outer fitting case 12 which becomes an opening part between the overlapping surfaces of the upper peripheral wall 18a of the outer fitting case 12 and the upper peripheral wall 20a of the inner fitting case 14 is the flange 68, The cover wall 40 is double covered from above. As shown in FIG. 2, in such an overlapped state, the collar portion 68 is arranged to be opposed to the upper surface of the cover wall portion 40 with a slight distance upward, while the cover wall portion 40 and the outer fitting case are disposed. The 12 upper peripheral walls 18a and the upper peripheral wall 20a of the inner fitting case 14 are overlapped with each other without a substantial gap. Further, the extending edge of the flange 68 extends beyond the opening edge of the upper peripheral wall 18 a of the outer fitting case 12 toward the inner fitting case 14, and is spaced above the tapered surface 48 of the inner fitting case 14. Arranged.

  Further, in such a combined state of the outer fitting case 12 and the inner fitting case 14, the side end wall portions 42 formed at both ends in the circumferential direction of the cover wall portion 40 and the support ribs 46 in the middle portion are provided in the outer fitting case. 12 is accommodated in a notch 82 formed at the edge of the opening. Thereby, the substantially whole of each opening piece 84 formed in the opening edge part of the surrounding wall 18 of the external fitting case 12 is inserted in the inner area | region of the cover wall part 40 formed in the door pocket shape. .

  In addition, in the lower peripheral wall 18b, the right peripheral wall 18c, and the left peripheral wall 18d of the outer fitting case 12 in which the flange portion 68 is not formed, the opening edge of the peripheral wall 18 of the outer fitting case 12 is the peripheral wall of the inner fitting case 14. 20 and the cover wall 40. Thereby, the opening edge part of the peripheral wall 18 of the outer fitting case 12 used as the opening part between the overlapping surfaces of the peripheral wall 18 of the outer fitting case 12 and the peripheral wall 20 of the inner fitting case 14 is covered with the cover wall part 40. It becomes.

  Further, when the outer fitting case 12 and the inner fitting case 14 are completely combined, the engagement lock portions 54 provided at various positions of the outer fitting case 12 are respectively locked to the engagement protrusions 34 of the inner fitting case 14. The lock fitting portion 58 is configured. Further, the entire engaging projection piece 36 of the inner fitting case 14 is completely fitted into the engaging groove portion 56 of the outer fitting case 12, thereby forming the positioning portion 60. Thereby, the outer fitting case 12 and the inner fitting case 14 are firmly fitted to form the box body 16, and the electrical connection box 10 in which the energization circuit member is accommodated is configured. Note that electrical components such as a fuse, a relay, and a connector (not shown) are appropriately attached to the electrical connection box 10.

  The completed electrical junction box 10 has a horizontal direction in the combination direction of the outer fitting case 12 and the inner fitting case 14 in the interior of an automobile (not shown), and the upper portions 50 and 22 of the cases 12 and 14 are It is mounted in a vertical position so that it is on the top. As a result, the flange 68 formed on the upper peripheral wall 18 a of the outer fitting case 12 is disposed on the upper side of the electrical junction box 10.

  The electrical junction box 10 installed in the passenger compartment or the like is not normally exposed to water. However, for example, when a large amount of dew condensation occurs or when a user spills a drink in the vehicle, the electrical connection box 10 is There is a risk of liquid such as water. In such a case, the dropped water or the like is received by the flange portion 68 provided above the electrical junction box 10, and is inclined to both ends in the circumferential direction of the electrical junction box 10 by the inclination of the upper surface of the flange portion 68. After being guided, it is guided to the side of the electrical junction box 10 (the right peripheral wall 18c or the left peripheral wall 18d of the outer fitting case 12) by the inclined surface 78 on the proximal end side of the return portion 72. This prevents water or the like from reaching between the overlapping surfaces of the outer fitting case 12 and the inner fitting case 14 of the electrical junction box 10 and prevents the energization circuit member inside the electrical junction box 10 from being wetted. The

  Thus, according to this embodiment, by providing the collar portion 68 on the upper side of the opening portion of the overlapping surface of the peripheral wall 18 of the outer fitting case 12 and the peripheral wall 20 of the inner fitting case 14 of the electrical connection box 10, The overlapping portions of the peripheral walls 18 and 20 of the outer fitting case 12 and the inner fitting case 14, and the lock fitting portions 58 and the positioning portions 60 provided on the peripheral walls 18 and 20 are prevented from being wetted. As a result, it is possible to prevent water or the like from entering the inside of the electrical junction box 10 between the overlapping surfaces of the outer fitting case 12 and the inner fitting case 14 or from the lock fitting portion 58 or the like. Therefore, the waterproofness of the electrical junction box 10 can be improved easily and inexpensively without providing a special rubber packing for waterproofing.

  In particular, according to the present embodiment, since the upper surface of the flange portion 68 is inclined by a substantially angle α, water or the like falls faster from the extending tip end side of the flange portion 68, The inclined surface 70 can be guided to both ends in the circumferential direction of the flange portion 68 by the inclination of the inclined surface 70. As a result, the water received by the collar portion 68 can be dropped to the lower side of the electrical connection box 10 through the side of the electrical connection box 10 where no opening or the like is formed, and water or the like is externally fitted. Without reaching between the overlapping surfaces of the case 12 and the inner fitting case 14, it can be quickly eliminated from the outer peripheral surface of the electrical junction box 10. As a result, it is possible to advantageously prevent water from entering between the overlapping surfaces of the peripheral walls 18 and 20 of the electrical connection box 10, and reduce the possibility that the energized circuit member inside the electrical connection box 10 gets wet. it can.

  In addition, in the present embodiment, return portions 72 are integrally formed at both ends in the circumferential direction of the flange portion 68 to which water or the like is guided, and the proximal end side of the return portion 72 extends from the extension of the flange portion 68. It is set as the inclined surface 78 which inclines toward the base end side of the upper part 50 of the external fitting case 12 of a reverse direction to the protrusion front end side. Thereby, after guiding the water on the collar portion 68 guided to both ends in the circumferential direction of the collar portion 68 to the proximal end side of the upper portion 50 of the outer fitting case 12, the right peripheral wall 18c or the left side of the outer fitting case 12 is left. It can fall along the wall surface of the base end side of the surrounding wall 18d. As a result, water guided to both ends in the circumferential direction of the collar portion 68 falls from the extending tip end side of the collar portion 68, and an opening between the overlapping surfaces of the peripheral walls 18 and 20 of the cases 12 and 14. And the lock fitting portion 58 and the like can be prevented. Moreover, since the strength of the collar part 68 is improved by providing the return part 72 in the collar part 68, the thickness dimension of the collar part 68 can be kept small.

  Further, a cover wall portion 40 having a door-bag structure is formed on the peripheral wall 20 of the inner fitting case 14 of the electrical junction box 10 of the present embodiment, and the opening edge of the upper portion 50 of the outer fitting case 12 is formed. Each opening section 84 formed in the portion is accommodated in the inner region of the cover wall portion 40. Thereby, the opening edge part of the surrounding wall 18 of the outer fitting case 12 is inserted between the surrounding wall 20 of the inner fitting case 14 and the cover wall part 40, and it is set as the triple overlapping structure. As a result, the opening between the overlapping surfaces of the peripheral walls 18 and 20 of the outer fitting case 12 and the inner fitting case 14 is protected and waterproofed by the cover wall portion 40 on substantially the entire circumference of the electrical junction box 10. It has become. In particular, in the upper part of the electrical connection box 10, since such a cover wall portion 40 is provided on the lower side of the flange portion 68, it is assumed that water or the like is downward from the extended tip end side of the flange portion 68. Even if the cover wall 40 is dropped, water does not enter between the overlapping surfaces of the peripheral walls 18 and 20 of the cases 12 and 14 due to the waterproof action of the cover wall 40. In addition, in the upper part of the electrical junction box 10, even if water or the like enters the extended tip side of the cover wall 40 beyond the extended tip part of the collar part 68, The inner space of the electrical junction box 10 is reached without passing through a complicated and narrow path constituted by the inner surface, the cover wall 40, the upper peripheral wall 18a of the outer fitting case 12, and the upper peripheral wall 20a of the inner fitting case 14. Therefore, the intrusion of water or the like can be sufficiently prevented.

  In the present embodiment, the upper portion 22 of the inner fitting case 14 positioned below the extending tip of the collar portion 68 is tapered toward the bottom wall portion 24 of the inner fitting case 14. 48 is formed. Thereby, the water etc. which fell on the inner fitting case 14 from the extension front-end | tip part of the collar part 68 can be rapidly guide | induced to the bottom wall part 24 side of the inner fitting case 14 by the inclination of the taper surface 48. FIG. Thereby, water or the like that has fallen from the flange portion 68 enters from the extending front end side of the cover wall portion 40 into the inside of the cover wall portion 40 or between the overlapping surfaces of the peripheral walls 18 and 20 of the cases 12 and 14. It can be effectively prevented. In particular, a plurality of protruding ribs 80 project from the upper surface of the collar portion 68 of the present embodiment, but the tapered surface 48 is also formed below the position where the protruding ribs 80 are formed. Thus, even when water flowing down the upper surface of the flange portion 68 in the circumferential direction is blocked by the protruding rib 80 and falls downward from the extended end portion of the flange portion 68, the water falls on the tapered surface 48. Then, it is guided to the bottom wall portion 24 side of the inner fitting case 14. This prevents water from entering between the overlapping surfaces of the peripheral walls 18 and 20 of the cases 12 and 14 even at the lower position of the protruding rib 80. In this embodiment, the outer peripheral surfaces of the fuse mounting portion 26 and the relay mounting portion 28 formed on the bottom wall portion 24 of the inner fitting case 14 are all outward from the bottom wall portion 24 of the inner fitting case 14. Due to the protruding structure, even when water descends along the upper surface of the bottom wall portion 24, water does not enter the interior of each fuse mounting portion 26 and relay mounting portion 28. .

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the specific shape of the flange portion 68, the inclination angle of the upper surface, and the like are the overlapping surfaces of the peripheral wall 18 of the outer fitting case 12 and the peripheral wall 20 of the inner fitting case 14 with water or the like dropped on the electrical connection box 10. If it can guide so that it may keep away from the opening part of between, it will not specifically limit. That is, in the said embodiment, although the collar part 68 inclined toward the circumferential direction both sides of the external fitting case 12, the upper surface of the collar part 68 inclines from one edge part of the circumferential direction to the other edge part. It may be said. Further, the flange portion 68 may be formed to protrude further outward than both circumferential end portions of the upper peripheral wall 18 a of the outer fitting case 12. Furthermore, the upper surface of the flange portion 68 may be inclined from the extending distal end side of the flange portion 68 toward the proximal end side. By adopting such a structure, water or the like can be more efficiently moved away from the opening between the overlapping surfaces of the peripheral walls 18 and 20 of the cases 12 and 14.

  Further, the specific shape of the return portion 72 and the inclination angle of the inclined surface 78 are not particularly limited. That is, in the above embodiment, the end portion of the inclined surface 78 is connected to the intermediate portion in the extending direction of the upper portion 50 of the outer fitting case 12, so that water or the like can be supplied to the right peripheral wall 18 c and the left peripheral wall of the outer fitting case 12. Although it was designed to flow down the intermediate part in the extending direction of 18d, for example, when the opening part such as the terminal insertion hole 62 is not provided in the bottom wall part 52 of the outer fitting case 12, water or the like is used. You may make it guide | invade to the bottom wall part 52 side of the external fitting case 12. FIG. Further, the return portion 72 may be formed on the whole or a part of the extending tip side of the collar portion 68.

  Furthermore, the specific shape and formation position of the lock fitting portion 58 including the engagement protrusion 34 and the engagement lock portion 54 and the positioning portion 60 including the engagement protrusion 36 and the engagement groove portion 56 are arbitrarily changed. Is possible. In particular, in the above embodiment, the lock fitting portion 58 and the positioning portion 60 are also formed on the upper peripheral walls 18 and 20, but the lock fitting portion 58 and the positioning portion 60 are arranged on the upper peripheral wall of the entire peripheral walls 18 and 20. You may make it provide only in other than 18a and 20a. Thereby, it becomes possible to provide the cover wall part 40 in the whole upper side surrounding wall 18a below the collar part 68, and can improve waterproofness more. In the above-described embodiment, the cover wall portion 40 is not formed at the position where the engagement protrusion 34 is formed in the upper portion 22 of the inner fitting case 14, so that the tapered surface 48 is not provided. Of course, the tapered surface 48 may be provided also at the position where the engagement protrusion 34 is formed. Thereby, the penetration | invasion of the water from the lock fitting part 58 can be prevented more effectively.

10: Electrical connection box, 12: Outer fitting case, 14: Inner fitting case, 16: Box body, 18, 20: Perimeter wall, 22, 50: Upper part, 24: Bottom wall part, 40: Cover wall part, 48: Tapered surface, 68: collar part, 70, 78: inclined surface

Claims (3)

In the electrical junction box in which the energizing circuit member is accommodated in the rectangular box body that is combined by fitting the peripheral wall of the inner fitting case into the peripheral wall of the outer fitting case ,
The outer fitting case and the inner fitting case are mounted vertically in a state where the combination direction is a horizontal direction ,
On the upper part of the outer fitting case that is positioned above in the vertically mounted state, a collar part that is opposed to the outer peripheral surface of the upper part peripheral wall of the outer fitting case with a gap is formed.
The flange extends beyond the opening edge of the upper peripheral wall of the outer fitting case to the upper side of the inner fitting case,
In the upper portion of the outer fitting case, the flange portion extends over the entire width direction of the upper partial peripheral wall of the outer fitting case that is in a direction orthogonal to the combination direction , and the upper surface of the flange portion is the upper side of the outer fitting case. An inclined surface inclined downward in which the lower portion of the outer fitting case is located toward the end in the width direction of the partial peripheral wall ; and
An end portion in the width direction of the flange portion is integrally formed with an upwardly inclined return portion, and a proximal end side of the return portion is directed toward a proximal end side of the upper portion of the outer fitting case. An electrical junction box characterized by being inclined . In the upper portion of the inner fitting case positioned above in the vertically mounted state, a cover that is disposed to face the outer peripheral surface of the peripheral wall of the inner fitting case with a gap and extends toward the outer fitting case A wall portion is formed, and an extended end portion of the cover wall portion is fitted between the peripheral wall of the outer fitting case and the flange portion, while the open end of the peripheral wall of the outer fitting case The electrical junction box according to claim 1, wherein an edge portion is fitted between a peripheral wall of the inner fitting case and the cover wall portion. The taper surface which inclines toward the bottom wall part of the said internal fitting case is formed in the said upper part of the said internal fitting case, and the said collar part has extended above this taper surface. Or the electrical junction box of 2.

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