JP5299219B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box mounted on an automobile, and more particularly to an electrical junction box in which a wire harness extraction hole is provided at the bottom.

  Conventionally, an electrical connection box such as a relay box or a fuse box provided with an electric circuit is used for wiring of an automobile. In such an electrical junction box, generally, an upper cover and a lower cover are assembled from above and below with respect to a box body provided with an electrical circuit in order to prevent contact of foreign matter with the electrical circuit and intrusion of rainwater.

  And the input / output line (wire harness) to the internal electric circuit is taken out from the inside of the cover to the outside, and wiring is prevented from entering the cover through this input / output line. There is a need. Therefore, as described in Japanese Patent Application Laid-Open No. 2008-61392 (Patent Document 1), the input / output line is taken out to the outside through the take-out hole provided in the bottom portion of the lower cover.

  By the way, such input / output lines are connected to a plurality of connection terminals provided in an electric circuit inside the electric connection box by connector fitting, bolt tightening, or the like. Therefore, after attaching the lower cover to the box body, it is extremely difficult to insert the input / output line from the outside into the lower cover takeout hole and connect it to the electric circuit. After connecting, attach the lower cover to the box body. In order to realize the mounting operation of the lower cover, as described in Patent Document 1, an insertion window extending in the depth direction from the bottom extraction hole to the opening edge is provided on the peripheral wall of the lower cover. The input / output line is led into the extraction hole from the insertion window. Further, if the insertion window is left open, foreign matter and rainwater may enter the lower cover from there. For example, as shown in FIG. An opening / closing lid that is rotatably connected to the edge via a hinge portion is provided to cover the opening of the insertion window.

  However, such a conventional open / close lid has a problem that it is difficult to obtain a sufficient waterproofing effect when the extraction hole is provided in the center portion of the lower cover bottom wall. That is, an insertion window extending from the peripheral wall portion to the extraction hole is formed on the bottom wall of the lower cover provided with the opening / closing lid, and it is difficult to cover the insertion window formed on the bottom wall of the lower cover with the opening / closing lid. Because it becomes.

  It is also possible to provide a protruding wall that extends from the open / close lid that covers the peripheral wall of the lower cover toward the take-out hole to cover the opening of the insertion window formed on the bottom wall of the lower cover, but the hinge portion is the center. On the locus of the opening / closing operation of the opening / closing lid, there is a portion that cannot be covered with the protruding wall in order to avoid interference with the input / output lines and other portions, and there is a possibility that water may enter from there.

JP 2008-61392 A

  The solution of the present invention is that the wire harness outlet hole is provided in the central portion of the bottom wall of the lower cover, and an insertion window for introducing the wire harness into the outlet hole is formed in the region extending from the peripheral wall of the lower cover to the bottom wall. Even if it is, it covers such an insertion window so that it can be opened and closed, and in the closed state it has a hinge-type opening and closing lid that can suppress the gap of the insertion window to be small and prevent rainwater and the like from entering through the insertion window as much as possible. The object is to provide an electrical junction box having a novel structure.

  In the first aspect of the present invention, a lower cover is attached to an electrical junction box body to which a wire harness is attached, and the wire harness is taken out from a harness outlet hole provided in a bottom wall of the lower cover. In the electrical junction box configured as described above, the lower cover is provided by providing a cutting line extending in a diameter direction of the harness extraction hole to divide the harness extraction hole in half, and linearly extending one end of the cutting line. A second dividing line that extends to the outer peripheral edge of the bottom wall of the lower cover by extending the other end of the dividing line to the side of the dividing line. As a line, a hinge is provided on the peripheral wall of the lower cover located on the extension line of the first dividing line, while the second dividing line is further extended to the peripheral wall of the lower cover. The lower cover main body and the lid are provided, and the lower cover main body and the lid are opened and closed on the first dividing line and the second dividing line based on the rotation operation in the hinge portion, and the lower cover The harness outlet hole is opened and closed on the cutting line.

  According to the first aspect, the lower cover main body and the lid body divided on the first dividing line and the second dividing line are relatively swingable about the hinge portion, so that the wire harness Insertion and placement into the harness mounting hole is easy. That is, the peripheral wall portion of the harness mounting hole is divided into halves on the cutting line, and the halves are relatively swingable. By swinging the cover main body and the cover body including them so as to be separated from each other along the cutting line, a gap is formed between the halves. After the wire harness is inserted between the halves through this gap, the cover body and the lid are swung again, and the halves are combined with each other at the cutting line, so that the wire harness is inserted into the harness mounting hole. Placement is easily realized.

  In addition, in the state where the halves are combined, even when the position where the harness mounting hole is formed is close to the center portion of the bottom wall of the lower cover, the sealing performance on the peripheral wall of the harness mounting hole is secured, and rainwater etc. is cut off. Can be prevented from entering the harness mounting hole. The lower cover is divided by a dividing line extending in the radial direction of the harness mounting hole to form a half body, and a hinge part is provided on the extension line of the cutting line, so that the hinge part of the half body is provided. The halves are prevented from being caught when the rocking displacement is centered on the. Therefore, the peripheral wall of the harness mounting hole can be made into a substantially continuous circle over the entire circumference, and the harness mounting hole and the wire harness side member can be made to correspond to the shape of the wire harness side member such as a corrugated tube. A gap between them is prevented. As a result, it is possible to prevent water and foreign matter from entering between the harness mounting hole and the wire harness side member.

  Further, since the second dividing line extends to the side of the dividing line, the lower cover main body and the lid body divided by the first and second dividing lines are formed in different sizes. As a result, a large mounting area of the lower cover body to the vehicle body and the like is ensured, stable fixing of the electric connection box to the vehicle body is realized, and the swinging lid body is smaller than the lower cover body. By doing so, the opening and closing operation of the harness mounting hole becomes advantageous.

  In addition, the lower cover main body side, which is larger than the lid, has a structure with more corners, so that the strength of the lower cover main body is sufficiently secured. As a result, the assembly and fixing of the electric junction box to the vehicle body and the like are further stabilized, and the lid is locked and held stably, so that a water stop function and the like can be advantageously obtained.

  According to a second aspect of the present invention, in the electrical junction box according to the first aspect, the opening peripheral edge of the harness attachment hole has a semi-cylindrical shape at each of both side portions sandwiching the score line, and the lower cover An extending cylindrical portion protruding outward is integrally formed.

  According to the 2nd aspect, while a wire harness is protected by the extension cylinder part, positioning is hold | maintained. As a result, contact between the wire harness and another member is avoided, and the wire harness is prevented from being bent more than necessary, so that damage to the wire harness can be prevented and durability can be improved.

  In addition, when a protective member such as a corrugated tube is mounted around the wire harness mounted in the harness mounting hole, the corrugated tube can be more firmly provided by providing an extended cylindrical portion at the opening periphery of the harness mounting hole. It becomes possible to hold, and the waterproofness is further improved. Furthermore, the length of the corrugated tube can be shortened by lowering the cost by projecting the extending tube portion downward from the opening peripheral edge portion of the harness mounting hole.

  According to a third aspect of the present invention, in the electrical junction box according to the first or second aspect, in at least one of the first dividing line and the second dividing line formed on the bottom wall of the lower cover, In the closed state, double walls are provided that are overlapped with each other in the thickness direction of the bottom wall of the lower cover.

  According to the third aspect, by covering the boundary portion between the lower cover main body and the lid body with the double wall, water and foreign matter can be more effectively prevented from entering the inside of the electric junction box through the first and second dividing lines. Can be prevented. In particular, when traveling on a submerged channel, muddy water splashed from below by wheels can be advantageously prevented from entering the electrical junction box through the gap between the first and second dividing lines.

  In the present invention, the lower cover is divided by the first and second dividing lines extending from both ends of the dividing line that divides the harness mounting hole, and the divided sides are made swingable around the hinge portion. The wire harness can be easily inserted into the harness mounting hole formed in the lower cover. In addition, the position of the harness mounting hole can be set freely, and the degree of freedom in design is increased. In addition, each portion of the divided lower cover is secured with sufficient strength, and stable attachment of the lower cover to a vehicle body or the like is also realized.

The perspective view which shows the electrical junction box as one Embodiment of this invention. The bottom view of the lower cover which comprises the electrical-connection box shown by FIG. The side view of the lower cover shown by FIG. FIG. 3 is a bottom view of the lower cover shown in FIG. 2, showing a state in which the latch holding of the lid is released. The side view of the lower cover shown by FIG.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an electrical junction box 10 as an embodiment of the present invention. The electrical junction box 10 includes a rectangular cylindrical electrical junction box main body 14 that accommodates components such as a relay to which the wire harness 12 is connected, an upper cover 16 that covers the upper opening of the electrical junction box main body 14, and an electrical connection. And a lower cover 18 that covers the lower opening of the box body 14.

  The lower cover 18 is formed of a hard synthetic resin or the like, and as shown in FIGS. 2 and 3, the lower cover 18 has an open box shape as a whole and opens upward, and is integrally formed with the bottom wall 20. And a peripheral wall 22. The bottom wall 20 has a shape in which one of the square corners is cut out in a bottom view, the lower right portion in FIG. 2 is a flat portion 23, and the other portion is on the flat portion 23 side. The inclined portion is inclined downward. On the other hand, the peripheral wall 22 rises upward from the outer peripheral edge portion of the bottom wall 20 over the entire periphery, and has a cylindrical shape as a whole. The peripheral wall 22 has a height dimension corresponding to the inclination of the bottom wall 20, and the upper end of the peripheral wall 22 is located on the same horizontal plane. The peripheral wall 22 is integrally formed with frame-like connecting portions 24 at a plurality of locations on the periphery and protrudes upward.

  A harness outlet hole 26 is formed in the bottom wall 20 of the lower cover 18. The harness extraction hole 26 is a circular hole having a diameter corresponding to the wire harness 12 and penetrates the flat portion 23 of the bottom wall 20 in the thickness direction. Further, a holding cylinder portion 28 is formed at the opening peripheral edge portion of the harness extraction hole 26. The holding cylinder portion 28 is integrally formed with the flat portion 23 of the bottom wall 20 of the lower cover 18 and protrudes downward with a substantially constant circular cross section. Furthermore, a pair of retaining projections 30, 30 projecting toward the inner peripheral side are integrally formed at the lower end opening of the holding cylinder portion 28 at a portion facing in one radial direction.

  The lower cover 18 is substantially divided into a lower cover main body 32 and a lid body 34. That is, the harness take-out hole 26 is divided into two by a virtual cutting line 35 extending in one radial direction (vertical direction in FIG. 2), and the holding cylinder portion 28 is divided by the cutting line 35 to form a semi-cylinder. It is set as a pair of extension cylinder parts 36 and 36 which have a shape. Further, a first dividing line 38 extending substantially linearly from one end of the virtual cutting line 35 toward the extending direction of the cutting line 35 is formed, and a part of the bottom wall 20 of the lower cover 18 is formed. It is cut by the first dividing line 38. On the other hand, a second dividing line 40 is formed that extends substantially linearly from the other end of the cutting line 35 toward a direction substantially perpendicular to the extending direction of the cutting line 35 (left-right direction in FIG. 2). A part of the bottom wall 20 of the lower cover 18 and a part of the peripheral wall 22 are cut by the second dividing line 40. In the lower cover 18, one side separated by the first and second dividing lines 38 and 40 is a lower cover main body 32, and the other side is a lid 34.

  Note that the inclination angle α of the second dividing line 40 with respect to the dividing line 35 is set in a range of 90 ° ≦ α <180 °. Furthermore, it is more preferably set in the range of 90 ° ≦ α <135 °, and optimally α = 90 °. If α is set in the above numerical range, it is possible to avoid that the swinging displacement of the lid 34 described later with respect to the lower cover main body 32 is hindered by the contact between the lid 34 and the lower cover main body 32, and Strength can be secured advantageously.

  A hinge portion 42 is provided on the extension line of the first dividing line 38 on the peripheral wall 22 side, and the lower cover main body 32 and the lid body 34 are connected to each other at the hinge portion 42. The hinge portion 42 is integrally formed with the lower cover main body 32 and the lid body 34 and is allowed to be deformed by being partially thin. On the other hand, the second dividing line 40 is formed so as to cut the peripheral wall 22, and the lower cover main body 32 and the lid 34 can be separated from each other in the second dividing line 40. As a result, the lower cover body 32 and the lid 34 can swing relative to each other about the hinge portion 42, and the lid 34 can easily swing from the initial state shown in FIG. 2 to about 90 degrees. It has come to be.

  A locking claw 44 that projects toward the inside of the lower cover 18 is integrally formed at the end of the peripheral wall 22 of the lid 34 on the second dividing line 40 side. The locking claw 44 is provided with a return projection at the protruding tip. On the other hand, a locking groove 46 that opens to the outer peripheral surface and extends in the vertical direction is formed at the end of the peripheral wall 22 of the lower cover body 32 on the second cutting line 40 side. The wall portion on the 40 side is provided with a return-like protrusion that protrudes inward in the groove width direction. Then, the locking claw 44 is inserted into the locking groove 46 and the return projections engage with each other, so that the lid 34 is locked and held with respect to the lower cover body 32 in the state of FIG. It has become.

  Further, a frame-like locking portion 48 that protrudes toward the dividing line 35 is integrally formed in the vicinity of the end portion on the second dividing line 40 side in the extended cylindrical portion 36 on the lid 34 side. On the other hand, a locking projection 50 that protrudes to the outer peripheral side is integrally formed in the vicinity of the end portion on the second dividing line 40 side in the extended cylindrical portion 36 on the lower cover body 32 side. Then, the locking projection 50 is inserted into the inner peripheral side of the locking portion 48 having a frame shape and locked, so that the extending tube portion 36 on the lid 34 side and the extending tube on the lower cover main body 32 side. The part 36 is connected to form a cylindrical holding cylinder part 28 and a circular harness outlet hole 26 is formed. However, the holding cylinder portion 28 is formed by the lid 34 being positioned and held by the lower cover body 32 by the locking claw 44 and the locking groove 46 being locked. The protrusion 50 may be omitted.

  Further, a first water blocking wall 52 as a double wall is integrally provided at an end portion of the bottom wall 20 of the lower cover body 32 on the first dividing line 38 side. The first water blocking wall 52 has a plate shape, is provided on the lower surface of the bottom wall 20 of the lower cover body 32, and protrudes toward the lid 34. In the state where the lid 34 is locked and held with respect to the lower cover main body 32, the first dividing line 38 is covered over the substantially entire length by the first water blocking wall 52. Intrusion of water or the like from below through 38 is prevented.

  Further, a second water stop wall 54 as a double wall is integrally provided at the end of the bottom wall 20 of the lid 34 on the second dividing line 40 side. The second water stop wall 54 has a plate shape similar to that of the first water stop wall 52, is provided in a state of being superimposed on the lower surface of the bottom wall 20 of the lid 34, and faces the lower cover main body 32 side. Protruding. In the state where the lid 34 is locked and held with respect to the lower cover main body 32, the second dividing line 40 is covered over the substantially entire length by the second water blocking wall 54. Intrusion of water or the like from below through 40 is prevented.

  The lower cover 18 having such a structure is assembled to the electrical junction box main body 14 from below. That is, the connecting claw 56 provided on the outer peripheral surface of the electric junction box main body 14 is engaged with the connecting portion 24 provided on the peripheral wall 22 of the lower cover 18, so that the lower cover 18 moves below the electric junction box main body 14. Fixed to cover. Furthermore, the electric connection box 10 is formed by fixing the upper cover 16 from above the electric connection box body 14 by means similar to the lower cover 18. In the electrical junction box 10, components such as a relay housed in the electrical junction box body 14 are covered with the peripheral wall of the electrical junction box body 14, the upper cover 16, and the lower cover 18, and are separated from the external space.

  Further, when assembling the lower cover 18 to the electrical junction box main body 14, the lid 34 is swung with respect to the lower cover main body 32 so that the harness outlet hole 26 is divided and opened as shown in FIGS. In this state, the wire harness 12 connected to the components in the electrical junction box main body 14 can be inserted into the harness extraction hole 26 and easily taken out to the outside.

  More specifically, in a state where the locking of the lid body 34 to the lower cover body 32 is released, the lid body 34 is swung with respect to the lower cover body 32, and the harness extraction hole 26 is divided at the cutting line 35, The lower cover 18 is fixed to the electrical junction box body 14 to which the wire harness 12 is attached. And the wire harness 12 is inserted between the lower cover main body 32 and the cover body 34 from the second parting line 40 side, and is arranged on the inner peripheral side of the extended cylindrical portion 36 on the lower cover main body 32 side. Thereafter, the lid 34 is swung with respect to the lower cover main body 32, and the lid 34 is locked and held with respect to the lower cover main body 32, whereby the wire harness 12 is formed between the extended cylindrical portions 36 and 36. The harness exit hole 26 is inserted. In addition, a bellows-shaped corrugated tube 58 is externally inserted into the wire harness 12, and the corrugated tube 58 is inserted into the holding cylinder portion 28, and a pair of retaining protrusions are formed in the groove on the outer peripheral surface of the corrugated tube 58. By inserting 30 and 30, the corrugated tube 58 is positioned and held by the holding cylinder portion 28 and extends downward from the holding cylinder portion 28.

  Thus, in the electrical junction box 10 provided with the lower cover 18, the lower cover 18 is substantially divided into the lower cover main body 32 and the lid body 34 by the first and second dividing lines 38 and 40, and the hinge portion 42. The lower cover main body 32 and the lid body 34 are relatively swingable with respect to each other. As a result, the harness take-out hole 26 is divided and opened and closed by a part of the circumference by swinging the lid 34 with respect to the lower cover main body 32, and the wire harness 12 is connected to the harness take-out hole 26 through the open / close portion. On the other hand, it can be inserted from the side. Therefore, the wire harness 12 previously connected to the electrical circuit of the electrical junction box body 14 can be easily taken out through the harness take-out hole 26. Moreover, since the lower cover main body 32 and the lid body 34 are integrally connected by the hinge portion 42, an increase in the number of parts does not become a problem.

  Further, the first and second dividing lines 38 and 40 for dividing the lower cover main body 32 and the lid 34 are set so as to extend from both ends of the cutting line 35 in a direction orthogonal to the extending direction of the cutting line 35. Regardless of the position at which the harness outlet hole 26 is formed in the bottom wall 20, the lid 34 is smoothly swung and displaced without being caught by the lower cover main body 32. Therefore, the opening peripheral edge portion of the harness outlet hole 26 is formed into a predetermined circular shape without forming a notch or the like, thereby preventing an excessive gap from being formed between the wire harness 12 (corrugated tube 58). it can. As a result, it is possible to prevent rainwater and foreign matter from entering the electrical junction box 10 through the gap between the harness outlet hole 26 and the wire harness 12.

  Further, since the first dividing line 38 and the second dividing line 40 extend in a direction substantially orthogonal to each other in the radial direction of the harness extraction hole 26, the area of the bottom wall 20 of the lower cover main body 32 is the bottom of the lid 34. The area of the wall 20 is increased. Therefore, the support area by the vehicle body of the lower cover main body 32 is increased, and stable fixing is realized. In addition, since the lower cover body 32 has a structure with more corners than the lid body 34, the rigidity of the lower cover body 32, which is larger than the lid body 34, is sufficiently secured and deformation is prevented. By this, the stable attachment state to a vehicle body and the reliable latching holding | maintenance of the cover body 34 are implement | achieved.

  Further, by providing the first and second water blocking walls 52 and 54, water splashed from below is prevented from entering the electric junction box 10 through the first and second dividing lines 38 and 40. Thus, the water stop function of the lower cover 18 can be obtained more advantageously.

  Further, the holding cylinder portion 28 constituted by the extending cylinder portions 36 and 36 is integrally formed at the opening peripheral edge portion of the harness extraction hole 26 and protrudes downward, so that the water passing through the harness extraction hole 26 is discharged. Intrusion is advantageously prevented. Moreover, when the corrugated tube 58 is interposed between the holding cylinder portion 28 and the wire harness 12, a further water-stop effect is exhibited. In addition, since the pair of extending cylindrical portions 36 and 36 constituting the holding cylinder portion 28 are supplementarily fixed by the locking portion 48 and the locking protrusion 50, the holding cylinder portion 28 is The wire harness 12 and the corrugated tube 58 are effectively positioned and supported by being held in a cylindrical shape. In addition, the formation of a gap at the joint between the extended cylindrical portions 36 and 36 in the holding cylindrical portion 28 is prevented, so that the water stoppage can be improved.

  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 desirable that the extended cylindrical portions 36 and 36 (holding cylindrical portion 28) are provided in order to improve the water-stopping property and to stably support the wire harness 12, but are not essential and are omitted. May be. Further, the first and second water blocking walls 52 and 54 may be omitted in consideration of required water blocking performance, cost, and the like. Moreover, the holding cylinder part formed by the combination of the extension cylinder part does not necessarily have a cylindrical shape, and may have a cylindrical shape with a rectangular cross section or an irregular cross section.

  Specific structures of the electrical junction box main body 14, the upper cover 16, and the lower cover 18 are not particularly limited.

10: Electrical junction box, 12: Wire harness, 14: Electrical junction box body, 18: Lower cover, 20: Bottom wall, 22: Perimeter wall, 26: Harness outlet hole, 32: Lower cover body, 34: Cover body, 35: Cutting Line 36: extension cylinder part 38: first parting line 40: second parting line 42: hinge part 52: first water stop wall (double wall) 54: second water stop wall (two Heavy wall)

Claims (3)

In the electrical junction box in which the lower cover is attached to the electrical junction box body to which the wire harness is attached, and the wire harness is taken out from the harness outlet hole provided in the bottom wall of the lower cover. ,
A cutting line extending in the diameter direction of the harness extraction hole is provided to divide the harness extraction hole in half, and one end of the cutting line is linearly extended to reach the outer peripheral edge of the bottom wall of the lower cover. An extension of the first parting line as a second parting line extending to the outer peripheral edge of the bottom wall of the lower cover by extending the other end of the parting line to the side of the parting line A hinge portion is provided on the peripheral wall of the lower cover located on a line, while the second dividing line is further extended to the peripheral wall of the lower cover to divide the lower cover main body and the lid so as to rotate in the hinge portion. Based on the movement, the lower cover body and the lid are opened and closed on the first dividing line and the second dividing line, and the harness outlet hole of the lower cover is opened and closed on the cutting line. Electrical connection box, characterized in that the the As.   2. The electricity according to claim 1, wherein an extended cylindrical portion that is a semi-cylindrical shape and protrudes outward from the lower cover is integrally formed at both ends of the harness mounting hole at both sides of the cutting line. Connection box.   The double wall that overlaps each other in the thickness direction of the bottom wall of the lower cover in the closed state is provided in at least one of the first dividing line and the second dividing line formed on the bottom wall of the lower cover. The electrical junction box according to 1 or 2.

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