JP5704512B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box provided in an automobile, and more particularly to an electrical junction box attached to a vehicle body via an attachment portion provided in a box body.

  As is well known, a large number of wire harnesses are routed in an automobile. These wire harnesses are connected to an electrical connection box such as a junction box, a relay box, or a fuse box. The electrical connection box has a structure in which a mounting portion projects from a box body, and the mounting portion is fixed to a vehicle body panel or the like with a bolt or the like, thereby being attached to the vehicle body.

  By the way, when the vehicle is dismantled, the wire harness connected to the electrical junction box is pulled with a crane to collect the wire harness and the electrical junction box, thereby breaking the mounting portion of the electrical junction box and The connection box is removed from the vehicle body together with the box body.

  However, the attachment portion of the electrical junction box is firmly fixed to the vehicle body with a bolt or the like so that the electrical junction box does not easily fall off due to vibration or the like during traveling of the vehicle. Therefore, when the wire harness is pulled, the wire harness is disconnected before the mounting portion is broken, and the box body may be left on the vehicle body side.

  Therefore, Japanese Patent Laid-Open No. 2000-350331 (Patent Document 1) easily breaks the mounting portion by forming a notch or a hole in the base end portion of the mounting portion to reduce the cross-sectional area of the base end portion. An electrical junction box that can do this has been proposed. However, since the base end portion of the mounting portion is a portion where stress is likely to concentrate due to vibrations or the like during vehicle travel, if the base end portion is made weak, the mounting strength to the vehicle body may be impaired. That is, securing the mounting strength to the vehicle body leads to impairing the ease of breaking, and facilitating breaking leads to a decrease in mounting strength. It was difficult.

JP 2000-350331 A

  The present invention has been made in the background of the above-described circumstances, and the solution is to ensure that the mounting portion can be easily broken when the box body is recovered while securing the mounting strength to the vehicle body. Is to provide an electrical junction box with a simple structure.

  A first aspect of the present invention is an electrical connection box in which a mounting portion projects from a box body, and is fixed to a vehicle body at the mounting portion, around a fixing point to the vehicle body at the mounting portion. Is characterized in that a ruptured thin portion having a reduced thickness is formed and the thickness of the ruptured thin portion is reduced as the distance from the box body increases.

  In the electrical junction box having the structure according to the present invention, a thin portion for breaking having a reduced thickness is formed around a fixed point in the mounting portion. As a result, the attachment part is partially fragile in the thin part for breaking, and when recovering the electrical junction box, the thin part for breaking is broken and the periphery of the fixing point is broken, thereby removing the box body from the vehicle body. Can be separated. And in this invention, the thickness dimension in the thin part for a fracture | rupture is made so small that it leaves | separates from a box main body. Therefore, when a tensile force is exerted on the mounting portion at the time of collecting the electrical connection box, a crack is generated from the distal side of the relatively thin box body, and the breakage is started. The mounting portion can be easily broken by generating a crack along the fragile thinned portion starting from a crack on the distal side of the box body.

  Further, the thickness of the thin portion for breaking is relatively thicker on the proximal side of the box body in the mounting portion than on the distal side. Thereby, the rigidity on the box body side of the mounting portion that greatly affects the mounting strength to the vehicle body can be secured, and the mounting strength to the vehicle body can be secured. The thin portion for breaking has a relatively high strength because it is relatively thick on the proximal side of the box body. However, according to the present invention, the distal side of the box body is thin, By starting the rupture from the distal side, the remaining proximal cross-sectional area gradually decreases as the rupture progresses. As a result, the tensile stress at the time of recovery of the box body is gradually concentrated on the proximal side of the box body at the mounting part, and when the proximal side is broken, it is possible to generate a large tensile stress on the proximal side. In addition, the proximal thin portion for breaking having a relatively high strength can be easily broken. Thus, the mounting portion can be easily broken when the box body is recovered while securing a high fixing strength when mounting to the vehicle body.

  It should be noted that the thin portion for breaking does not necessarily have to be continuously formed, and a plurality of thin portions are formed intermittently around the fixing point of the mounting portion, and the plurality of thin portions are broken. You may comprise the thin part for use. Moreover, the thickness dimension of the attachment part in the thin part for fracture | rupture may be changed in steps around a fixed point, and may be changed smoothly smoothly. Furthermore, the thin part for fracture | rupture should just be a site | part by which the thickness dimension was partially made small in the attachment part, Comprising: It does not necessarily say the site | part with the smallest thickness dimension in an attachment part. Accordingly, the attachment portion may have a portion thinner than the thin portion for breaking.

  In the present invention, the fixing part in which the breaking thin part is formed is not limited as long as it is fixed to the vehicle body. For example, when a bolt insertion hole is formed in the mounting portion and the bolt is inserted into the bolt insertion hole and fixed to the vehicle body, the bolt insertion hole is used as a fixing point. When fixing by adhesion, welding, or the like, an adhesion site or a welding site is a fixing point.

  According to a second aspect of the present invention, in the one described in the first aspect, the thin portion for breaking is formed on a protruding leading edge and a protruding proximal edge from the box body in the mounting portion. It is what.

  If it does in this way, at the time of collection of a box main part, a crack can be produced from the projection tip edge part in an attaching part. As a result, the attachment portion can be torn along the thin portion for breakage, starting from a crack generated at the edge of the attachment portion, and can be more easily broken. Furthermore, since the thin portion for breaking is formed on both the protruding tip edge and the protruding proximal edge of the mounting portion, it is easy to cause a crack from the protruding distal edge to the protruding proximal edge of the mounting portion. Thus, more stable fracture can be performed.

  In addition, when the attachment portion has a rectangular shape or other polygonal shape, it is more preferable that the thin portion for breaking is formed at a corner portion where stress tends to concentrate at the protruding tip edge portion. If it does in this way, a crack can be easily made by the protrusion front-end | tip edge part of an attaching part. Moreover, in this aspect, the thin part for fracture | rupture should just be formed in the protrusion front end edge part and protrusion base end edge part of an attachment part, Comprising: It is not necessarily continuous from a protrusion front end edge part to a protrusion base end edge part. It is not necessary to be formed.

  According to a third aspect of the present invention, in the one described in the first or second aspect, the thin portion for breaking is formed between the fixing point to the vehicle body in the attachment portion and the box body. It is what has been.

  If it does in this way, the crack which arises along the thin part for a fracture | rupture can be advanced between the fixed point in a mounting part, and a box main body. Thereby, between a box main body and a fixed point can be more reliably divided | segmented, and a box main body can be more easily cut | disconnected from the fixing point of an attaching part.

  According to a fourth aspect of the present invention, in the one described in any one of the first to third aspects, a flat plate-like portion protruding from the box body is formed on the attachment portion, and the flat plate A reinforcing rib is formed on the shape portion, and the thin portion for breaking is formed including a notch formed in the reinforcing rib.

  According to this aspect, by reinforcing the reinforcing portion with the reinforcing rib without making the entire mounting portion thick, it is possible to reduce the amount of resin and avoid problems such as sink marks during molding. And the easiness of a fracture | rupture can be improved effectively by forming the thin part for a fracture | rupture in the reinforcing rib made thick.

  According to a fifth aspect of the present invention, in the one described in any one of the first to fourth aspects, a bolt as the fixing point through which a bolt for fixing to the vehicle body is inserted into the mounting portion. An insertion hole is formed, and the thin portion for breaking is formed closer to the outer peripheral edge of the mounting portion than the bolt insertion hole.

  According to this aspect, the thin portion for breaking is formed away from the bolt insertion hole. Thereby, the head portion of the bolt overlaps the thin portion for breaking, and the possibility that the thin portion for breaking is reinforced by the head portion of the bolt is reduced, and the ease of breakage in the thin portion for breaking is more reliably exhibited. I can do it.

  According to the present invention, in the mounting portion that protrudes from the box body and is fixed to the vehicle body, the breaking thin portion is provided around the fixing point to the vehicle body, and the thickness of the breaking thin portion is determined from the box body. I made it smaller as I left. As a result, the wall thickness is increased near the box body having a large influence on the mounting strength to ensure the mounting strength, while the wall thickness is reduced at the distal end with respect to the box body having a small influence on the mounting strength. By starting the break from the position, the attachment portion can be easily broken.

The perspective view of the box main body of the electrical junction box as 1st embodiment of this invention. The perspective view of the principal part of the box main body shown in FIG. The top view of the principal part shown in FIG. IV-IV sectional drawing of FIG. Explanatory drawing which expands and shows the thin part for a fracture | rupture in FIG. The top view corresponding to FIG. 3 which shows the principal part of the electrical-connection box as 2nd embodiment of this invention. The top view corresponding to FIG. 3 which shows the principal part of the electrical-connection box as 3rd embodiment of this invention. Cross-sectional explanatory drawing which shows roughly the VIII-VIII cross section in FIG. Sectional explanatory drawing corresponding to FIG. 8 which shows the aspect from which the principal part shown in FIG. 7 differs.

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

  First, FIG. 1 shows a box body 12 constituting an electrical junction box 10 as an embodiment of the present invention. The box body 12 is an integrally molded product formed from a synthetic resin. The box body 12 has a substantially rectangular box shape, and is provided with a plurality of relay mounting portions 14 to which relays are mounted. The box body 12 constitutes the electrical junction box 10 by assembling an upper case and a lower case (not shown).

  A mounting portion 20 is integrally formed on the outer peripheral wall 18 of the box body 12. 2 and 3 show the attachment portion 20. A flat plate-like portion 22 protruding from the outer peripheral wall 18 is formed on the mounting portion 20. The flat plate-like portion 22 has a substantially square plate shape projecting outward from the box body 12 substantially perpendicularly to the outer peripheral wall 18 and is integrally formed with the box body 12 with a substantially constant thickness. Yes.

  A harness mounting plate 26 is integrally formed on the outer peripheral edge 24 a of the flat plate portion 22. The harness mounting plate 26 is a protruding wall that protrudes vertically from the upper surface 25 of the flat plate-like portion 22 over substantially the entire length of the outer peripheral edge portion 24a. A harness mounting hole 28 is provided in the harness mounting plate 26, and a clamp projection provided on the wire harness (not shown) is inserted into the harness mounting hole 28 and fixed, whereby the wire harness is connected to the electrical connection box 10. It is supposed to be fixed to. Such a harness mounting plate 26 is connected to the protruding base end edge portion 30 from the outer peripheral wall 18 in the flat plate-like portion 22 by a connecting wall 32. The connecting wall 32 is formed so as to protrude vertically from the upper surface 25 over substantially the entire length of the protruding base end edge portion 30 of the flat plate-like portion 22. Further, the outer peripheral edge 24c on the lower surface 33 of the flat plate-like portion 22 is connected to the reinforcing wall 34 protruding from the outer peripheral wall 18 over substantially the entire length. However, the harness mounting plate 26, the connecting wall 32, and the reinforcing wall 34 are not necessarily required.

  A circular bolt insertion hole 36 is provided through the central portion of the flat plate portion 22. As conventionally known, a bolt (not shown) is inserted into the bolt insertion hole 36 so that the mounting portion 20 is fixed to a vehicle body panel (not shown). Thus, in this embodiment, the bolt insertion hole 36 is a fixing point to the vehicle body.

  A reinforcing rib 38 protrudes and is integrally formed on the upper surface 25 of the flat plate portion 22. The formation position of the reinforcing rib 38 is appropriately set in consideration of the mounting strength required for the mounting portion 20 and a fixing method such as bolt fixing or adhesion. In the present embodiment, the reinforcing ribs 38a and 38b are formed to extend linearly over the entire length of the outer peripheral edge portions 24b and 24c of the flat plate-like portion 22, respectively. On the other hand, a reinforcing rib 38 c is formed over the entire circumference surrounding the bolt insertion hole 36. The reinforcing rib 38c is connected to the reinforcing rib 38a. The reinforcing rib 38d that connects the reinforcing rib 38c and the harness mounting plate 26, the reinforcing rib 38e that connects the reinforcing rib 38c and the connecting wall 32, and the reinforcing rib 38f that connects the reinforcing rib 38c and the reinforcing rib 38b extend linearly. It is formed out. These reinforcing ribs 38d, 38e, and 38f are formed at regular intervals (every 90 ° around the central axis of the bolt insertion hole 36) in the circumferential direction of the bolt insertion hole 36. In addition, the reinforcing ribs 38a, 38d, and 38f extend in parallel with each other, and the reinforcing ribs 38b and 38e extend in parallel with each other so that the reinforcing ribs 38a, 38d, and 38f and the reinforcing ribs 38b and 38e are mutually connected. It extends perpendicularly. As shown in FIG. 4, the protruding dimensions of the reinforcing ribs 38 a to 38 f from the upper surface 25 of the flat plate-like portion 22 (the vertical dimension in FIG. 4) are equal to each other. The portion where 38f is formed is partially thick.

  Cutouts 40a, 40b, 40d, and 40e are formed in the reinforcing ribs 38a, 38b, 38d, and 38e, respectively. These notches 40a, 40b, 40d, and 40e are formed on the upper surfaces of the reinforcing ribs 38a, 38b, 38d, and 38e, respectively. Although the cross-sectional shape of the notches 40a, 40b, 40d, and 40e in the present embodiment is substantially U-shaped, various cross-sectional shapes such as a rectangular shape and a triangular shape that tapers on the flat plate-like portion 22 side are appropriately used. Can be adopted. The notches 40a, 40b, 40d, and 40e are preferably formed over the entire width of the reinforcing ribs 38a, 38b, 38d, and 38e. Thereby, the notches 40a and 40b formed in the reinforcing ribs 38a and 38b are opened in the outer peripheral edge portions 24b and 24c of the flat plate-like portion 22, respectively.

  By forming these notches 40a, 40b, 40d, and 40e, the reinforcing ribs 38a, 38b, 38d, and 38e are partially protruded from the upper surface 25 of the flat plate portion 22 (the vertical dimension in FIG. 4). It has been made smaller. As a result, the mounting portion 20 has the thinned portions 42a, 42b, 42d for breaking whose thickness dimension (the vertical dimension in FIG. 4) is partially reduced by the portions where the cutouts 40a, 40b, 40d, 40e are formed. , 42e are formed, and a breaking thin portion 42 extending around the bolt insertion hole 36 is formed including the breaking thin portions 42a, 42b, 42d, 42e.

  As shown in FIG. 3, the cutouts 40a, 40b, 40d, and 40e are formed in the reinforcing ribs 38a, 38b, 38d, and 38e, so that the thin portions 42a, 42b, 42d, and 42e for breaking have bolt insertion holes. Around the center axis of the bolt insertion hole 36 indicated by an arrow in FIG. Thus, a breaking thin portion 42 configured by connecting the breaking thin portions 42d, 42e, and 40b is formed between the bolt insertion hole 36 and the box body 12. Further, the cutouts 40a, 40b, 40d, and 40e (that is, the thin portions 42a, 42b, 42d, and 42e for breaking) are inserted from the bolt insertion holes 36 in the extending directions of the respective reinforcing ribs 38a, 38b, 38d, and 38e. Is preferably formed on the outer peripheral edge side of the mounting portion 20. In the present embodiment, the cutouts 40a and 40d (breaking thin portions 42a and 40d) are formed at the edge portions on the outer peripheral edge 24a side of the reinforcing ribs 38a and 38d. Further, the notch 40a is formed on the outer peripheral edge 24a on the outer peripheral edge 24a side, in the outer peripheral edge 24b serving as a protruding tip edge from the box body 12 in the mounting portion 20. On the other hand, notches 40e and 40b (breaking thin-walled portions 42e and 42b) are formed at the end edges of the reinforcing ribs 34e and 34b on the protruding base end edge 30 side.

  The depth dimensions of these notches 40a, 40b, 40d, and 40e are varied stepwise around the bolt insertion hole 36. FIG. 5 is an enlarged view of the portions where the notches 40a, 40b, 40d, and 40e are formed in the mounting portion 20, and the depth dimensions of the notches 40a, 40b, 40d, and 40e are bolt insertions indicated by arrows in FIG. Around the hole 36, the depth dimension gradually increases from the notch 40b proximal to the box body 12 to the notch 40a distal to the box body 12 in the order of the notches 40b, 40e, 40d, and 40a. It has been enlarged. As a result, the attachment portion 20 has the thickness dimensions Tb, Te, Td, and Ta of the thin-walled portions 42b, 42e, 42d, and 42a for breaking, and the proximal portion is broken with respect to the box body 12 around the bolt insertion hole 36. From the thin-walled portion 42b to the thin-walled portion 42a for rupture distal to the box body 12, the thin-walled portions 42b, 42e, 42d, 42a are gradually reduced in order, and Tb> Te> Td> Ta. ing.

  As shown in FIG. 1, the box main body 12 is integrally formed with an attachment portion 44 at a position opposite to the attachment portion 20 in addition to the attachment portion 20. The attachment portion 44 has a plate shape that protrudes from the outer peripheral wall 18 of the box body 12, and a bolt insertion hole 46 is provided therethrough. Between the bolt insertion hole 46 in the attachment portion 44 and the box body 12, notches 48, 48 that open in the same direction as the notches 40 a, 40 b, 40 d, 40 e in the attachment portion 20 are formed. The depth dimensions of these notches 48 are equal to each other.

  As is conventionally known, the electrical connection box 10 having such a structure has a connection terminal provided at a terminal of a wire harness (not shown) inserted into a relay mounting portion 14 or the like of the box body 12 so that the box body 12 The wire harness is extended from the electrical connection box 10 and taken out to the outside. Then, the lower surface 33 of the mounting portion 20 of the box body 12 is overlaid on a vehicle body panel (not shown), and a bolt (not shown) is inserted into the bolt insertion hole 36 from the upper surface 25 side. It is bolted to the panel. Similarly, the mounting portion 44 is overlapped with a vehicle body panel (not shown), and a bolt (not shown) is inserted into the bolt insertion hole 46 to be fixed to the vehicle body panel. Thereby, the electrical junction box 10 is fixed to the vehicle body panel at the mounting portions 20 and 44.

  When the vehicle is disassembled, a wire harness (not shown) extending from the box body 12 is pulled by a crane or the like. As a result, the box body 12 is pulled, and a tensile force from the box body 12 is exerted on the mounting portion 20. In the present embodiment, the attachment portion 20 is partially thinned at the breaking thin portions 42a, 42d, 42e, 42b to reduce the cross-sectional area, and the breaking thin portions 42a, 42d, The thicknesses 42e and 42b: Ta, Td, Te, and Tb are made smaller toward the distal end of the box body 12 around the bolt insertion hole 36. As a result, when a tensile force is applied to the mounting portion 20, a crack is generated from the thinned portion 42a for rupturing most distal from the box body 12, which has the smallest thickness, and the rupture is started. . And the crack which arose in the thin part 42a for a fracture | rupture progresses to the thin part 42d for a fracture | rupture which is proximal to the thin part 42a for a fracture | rupture next, and the thickness dimension was made small, and fracture | ruptures the thin part 42d for a fracture | rupture. . Subsequently, the crack proceeds in the order of the breaking thin portions 42e and 42b, and breaks the breaking thin portions 42e and 42b. Thus, when a tensile force is exerted on the mounting portion 20, the cracks progress in the order of the thin portions for break 42a, 42d, 42e, and 42b indicated by arrows in FIG. Thereby, the space | interval between the bolt insertion hole 36 which is a fixing point of the attachment part 20 and the box main body 12 is fractured. On the other hand, the attachment portion 44 is broken at the notches 48 and 48 when the box body 12 is pulled. As a result, the box body 12 can be removed from the vehicle body panel.

  As described above, in the present embodiment, the thickness dimensions of the breaking thin portions 42a, 42d, 42e, and 42b in the mounting portion 20 are Ta, Td, Te, and Tb around the bolt insertion hole 36. It is made smaller. This facilitates the breaking of the thinned portion 42a for breaking, which is the thinnest, and triggered by the breaking of the thinned portion 42a for breaking, the thinned portion 42d for breaking having a small wall thickness around the arrow in FIG. By proceeding the break in the order of 42e and 42b, the mounting portion 20 can be easily broken. On the other hand, the breaking thin portions 42e and 42b proximal to the box body 12 have a relatively large thickness. Thereby, the wall thickness dimension of the attachment part 20 is ensured in the protrusion base end edge part 30 of the attachment part 20 which has a big influence on the attachment strength to a vehicle body, and attachment strength can be ensured. The thin-walled portions 42e and 42b for breaking are relatively thick and ensured rigidity. However, when the mounting portion 20 is broken, the thin-walled portion 42a for breaking is started to break. As the rupture progresses, the stress can be concentrated on the remaining thin portions 42e and 42b for rupture, and the rupture can be easily performed. As a result, the contradictory effects of improving the ease of breaking of the mounting portion 20 and securing the mounting strength to the vehicle body can be achieved at a high level with a simple configuration without causing an increase in the number of special parts. .

  In particular, in the present embodiment, the breaking thin portion 42a is formed on the outer peripheral edge portion 24b serving as the protruding distal end edge portion of the mounting portion 20 from the box body 12, and the breaking thin portions 42e and 42f are projected proximal ends. It is formed on the edge 30. Thereby, the attachment part 20 can be easily fractured over the entire length from the outer peripheral edge part 24 b to the protruding base end edge part 30. Further, the cutouts 40a and 40f formed in the breaking thin-wall portions 42a and 42f are opened to the outer peripheral edge portion 24b and the outer peripheral edge portion 24c, respectively, and are formed thinly to the outermost peripheral edge portion of the flat plate-like portion 22. Therefore, it is easier to start the tearing from the outer peripheral edge 24a and complete the separation from the box body 12 at the outer peripheral edge 24c. Further, since the breaking thin portion 42a is formed at the corner of the flat plate portion 22 where stress is easily concentrated, the breaking thin portion 42a can be more easily broken. Further, the breaking thin portions 42 a and 42 d are formed in the outer peripheral edge portion 24 a, and the breaking thin portions 42 b and 42 e are formed in the protruding proximal end portion 30, and the bolt insertion hole 36 in the flat plate portion 22. It is located on the outer peripheral edge side. Thereby, the possibility that the head portion of the bolt inserted into the bolt insertion hole 36 overlaps the thin portion 42a, 42d, 42e, 42b for breaking is reduced, and the thin portion 42a, 42d, 42e for breaking at the head portion of the bolt. , 42b are pressed and reinforced to reduce the possibility of breakage.

  Further, by forming the breaking thin portions 42e and 42b on the protruding base edge portion 30, the extending path of the breaking thin portion 42 connecting the breaking thin portions 42a, 42d, 42e, and 42b becomes a bolt insertion hole. 36 and between the box body 12. Thus, when the mounting portion 20 is broken, a crack is induced between the bolt insertion hole 36 and the box body 12 along the breaking thin portion 42 connecting the breaking thin portions 42a, 42d, 42e, 42b. Thus, by dividing the space between the bolt insertion hole 36 and the box body 12, the box body 12 can be easily separated from the bolt insertion hole 36 that is a fixing point to the vehicle body panel.

  Next, the attachment part 62 of the electrical-connection box 60 as 2nd embodiment of this invention is shown in FIG. In the following description, members and parts having the same structure as in the first embodiment are given the same reference numerals as those in the first embodiment in the drawing, and the description will be appropriately described. Omitted.

  In the mounting portion 62 in the present embodiment, instead of the notch 40b in the first embodiment, a notch 40f is formed at the edge on the outer peripheral edge 24c side of the reinforcing rib 38f, and the reinforcing rib 38a A notch 40a ′ is formed at the edge on the outer peripheral edge 24c side. And the formation part of notches 40f and 40a 'is made into the thin part 42f and 42a' for a fracture | rupture, and the thickness dimension of the thin part 42a 'for a fracture | disconnection distal to the box main body 12 is in the box main body 12. On the other hand, it is made smaller than the thickness dimension of the proximal thin portion 42f for breaking. As a result, the attachment portion 62 is provided for breaking the outer peripheral edge portion 24b around the central axis of the bolt insertion hole 36 through the breaking thin portion 42a of the outer peripheral edge portion 24b and passing through the thin portions 42d, 42e, 42f for breaking. A breaking thin portion 42 extending in a U-turn shape returning to the thin portion 42a ′ is formed. Note that the thicknesses of the breaking thin portion 42a and the breaking thin portion 42a ′, and the breaking thin portion 42d and the breaking thin portion 42f having the same separation distance from the box body 12 may be equal to each other. They may be different from each other. In this way, it is possible to form the breaking thin portion 42 so as to extend so as to surround the bolt insertion hole 36.

  Next, FIGS. 7 and 8 show a mounting portion 72 of an electrical junction box 70 as a third embodiment of the present invention. In the flat plate-like portion 22 in the present embodiment, the reinforcing rib 38 in the first embodiment is not formed. The flat plate portion 22 is formed with a single notch 74 that extends around the bolt insertion hole 36 and extends from the outer peripheral edge portion 24b to the outer peripheral edge portion 24c. A thin portion 42 for breaking is formed in which the thickness dimension (the vertical dimension in FIG. 8) is partially reduced. Then, as shown in FIG. 8, the depth dimension of the notch 74 (the vertical dimension in FIG. 8) is increased stepwise from the outer peripheral edge 24c to the outer peripheral edge 24b. The thickness of the portion 42 is gradually reduced from the side of the outer peripheral edge 24c proximal to the box body 12 to the outer peripheral edge 24b distal to the box body 12 around the bolt insertion hole 36. . As is clear from this embodiment, the breaking thin portion 42 may be intermittently formed by combining a plurality of breaking thin portions 42a, 42d, 42e, 42b as in the first embodiment. As in the present embodiment, it may be formed continuously by a single continuous cutout 74. Further, in the present embodiment, as shown in FIG. 9, the thickness dimension of the breaking thin part 42 is changed so that the depth dimension of the notch 74 gradually changes from the outer peripheral edge part 24c to the outer peripheral edge part 24b. The outer peripheral edge 24c may gradually become smaller from the outer peripheral edge 24c toward the outer peripheral edge 24b.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, when a plurality of attachment portions are formed on the box body, a thin portion for breaking may be formed on the plurality of attachment portions.

  Further, the mounting mode of the mounting portion to the vehicle body is not limited to the bolt fixing as in the above-described embodiment. For example, the mounting hole is formed through the vehicle body panel, while the insertion projection is formed on the mounting portion. The mounting portion may be fixed to the vehicle body panel by inserting into the mounting hole. In such a case, the insertion protrusion is used as a fixing point to the vehicle body. Moreover, you may adhere | attach and fix an attaching part to a vehicle body panel. In such a case, the adhesion point is a fixing point to the vehicle body.

10, 60, 70: electrical junction box, 12: box body, 20, 62, 72: mounting portion, 22: flat plate portion, 24a, c: outer peripheral edge portion, 24b: outer peripheral edge portion (protruding tip edge portion), 30: Protruding base edge portion, 36: Bolt insertion hole (fixed point), 38a to f: Reinforcing rib, 40a, b, d, e, 74: Notch, 42a, b, d, e: Thin portion for breaking

Claims (5)

A mounting portion is provided so as to protrude from the box body, and is an electrical connection box fixed to the vehicle body at the mounting portion,
Around the fixing point to the vehicle body in the mounting portion is formed a thin portion for breaking with a reduced thickness dimension,
An electrical junction box, wherein the thickness of the thin portion for breaking is reduced as the distance from the box body increases. The electrical junction box according to claim 1, wherein the breaking thin portion is formed at a protruding leading edge and a protruding proximal edge from the box body in the mounting portion. The electrical junction box according to claim 1 or 2, wherein the thin portion for breaking is formed between a point fixed to the vehicle body at the attachment portion and the box body. A flat plate-like portion protruding from the box body is formed on the mounting portion, and a reinforcing rib is formed on the flat plate-like portion, including a notch formed in the reinforcing rib. The electrical junction box according to any one of claims 1 to 3, wherein a thin portion is formed. The mounting portion is formed with a bolt insertion hole as the fixing point for inserting a bolt for fixing to the vehicle body,
The electrical junction box according to any one of claims 1 to 4, wherein the breaking thin-wall portion is formed closer to the outer peripheral edge portion of the mounting portion than the bolt insertion hole.

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