JP2013243858A - Electric connection box with attached box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connection box with an attached box having a new structure which advantageously achieves improvements of the attachment rigidity of the attached box to the electric connection box and the removal operability of the attached box.SOLUTION: While a lock piece 54 and a pair of contact blocks 56, 56 located at both sides of the lock piece 54 are provided at one of a side wall 38 of an electric connection box 12 and a side wall 52 of an attached box 14, an engagement protruding part 40 engaged with an engaging part 60 provided at a tip portion of the lock piece 54 and a pair of housing parts 42, 42 which are located at both sides of the engagement protruding part 40 and house and hold the contact blocks 56, 56 are provided so as to protrude in the other of the side wall 38 of the electric connection box 12 and the side wall 52 of the attached box 14. An operation part 62 provided at the upper end side relative to the engaging part 60 of the lock piece 54 protrudes to a higher position than upper end surfaces of the contact blocks 56 and the housing parts 42 in a space which is located between the side walls of the electric connection box 12 and the attached box 14 and is formed by the contact blocks 56 and the housing parts 42.

Description

  The present invention relates to an electrical junction box mounted on an automobile, and more particularly to an electrical junction box with an attachment box formed by assembling an attachment box on a side wall of the electrical junction box.

  Conventionally, electrical connection boxes such as fuse boxes and junction boxes have been used in the electrical system of automobiles to improve the efficiency of electric wiring and improve maintenance. In recent years, in order to be able to flexibly cope with circuit changes due to different grades of automobiles, etc., an electric with attached box in which an attached box made of a circuit body such as a fuse circuit is detachably attached to the side wall of the electric junction box A junction box is also used. For example, the one described in Japanese Patent Application Laid-Open No. 2009-213193 (Patent Document 1).

  In such an electrical connection box with an attachment box, the attachment box is supported in a cantilevered state with respect to the side wall of the electrical connection box by a lock portion provided between the side wall of the electrical connection box and the side wall of the attachment box. The Rukoto. Therefore, when a load from above is applied to the attachment box for work such as fuse replacement, or when vertical vibrations are input when the vehicle is traveling, the attachment box with the coupling portion by the lock portion as the rotation center Is rotated outward, and there is a possibility that the durability of the connecting portion is deteriorated or damaged.

  Therefore, in the electrical junction box with an attachment box described in Patent Document 1, a lock portion is provided on the side wall of the attachment box, and a rib plate extending in the vertical direction is provided at a position adjacent to the lock portion, and the rib plate is connected to the electrical junction box. A structure is proposed in which the lower end of the rib plate is in contact with and supported by a stepped portion provided on the side wall of the electrical junction box. According to this, rotation of an attachment box can be suppressed by contact | abutting to the outer surface and level | step difference surface of an electrical junction box of a rib board, and fears, such as a fracture | rupture of a connection part, can be reduced.

  However, even if such a structure described in Patent Document 1 is used, there is still a possibility that the effect of suppressing the rotation of the attached box and the improvement of the durability of the connecting portion cannot be sufficiently obtained. That is, in the structure described in Patent Document 1, since the lock portions are provided on both sides of the rib plate, when an inclined load such as obliquely upward is input to the attachment box, the rib plate In addition to not being able to obtain a sufficient rotation prevention force due to the above, there is a possibility that a load is directly applied to the lock portion before the contact holding force by the rib plate is exhibited.

  In addition, since the lock portion has a shape protruding from the upper end side to the lower end side of the side wall of the attachment box, the upper surface (force point) of the attachment box to which a load from above is applied to the attachment box, and the lock of the attachment box It is inevitable that the separation distance from the connecting portion (fulcrum) to the electrical connection box side by the portion becomes longer by the protruding length of the lock portion. As a result, there is a possibility that the force applied to the connecting portion is increased and problems such as breakage of the connecting portion are easily caused.

  In addition, since the locking part protrudes from the upper end side to the lower end side of the side wall of the attachment box, when removing the attachment box from the electric connection box, a screwdriver or the like is inserted between the side walls from the lower side of the electric connection box. Therefore, it is necessary to perform a very complicated and precise operation for releasing the engagement of the lock portion by inserting it into the back of the device. Such work is difficult to perform when the electrical junction box is mounted in a narrow space such as in the engine room. Eventually, when the attached box is removed, the electrical junction box itself must be removed from the vehicle, and maintenance is required. There was also a problem that the workability at the time was inferior.

JP 2009-213193 A

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is that the attachment rigidity of the attachment box to the electrical junction box and the improvement of the detachability of the attachment box can be advantageously achieved. An object of the present invention is to provide an electrical junction box with an attachment box having a novel structure.

  In the first aspect of the present invention, in the electrical connection box with an attachment box formed by attaching an attachment box to the side wall of the electrical connection box, one of the side wall of the electrical connection box and the side wall of the attachment box facing each other, Lock pieces projecting from the lower end side of the side wall toward the upper end side are provided so as to project to the outer peripheral side of the side wall, and provided on both sides of the lock piece in the left-right direction of the side wall. A pair of abutting blocks extending in the left-right direction are provided so as to protrude to the outer peripheral side of the side wall from the lock piece, while the other of the side wall of the electrical connection box and the side wall of the auxiliary box is provided with Engaging protrusions that engage with engaging portions provided at the distal end portions of the lock pieces are provided at the upper end of the side wall, and the left and right sides of the side wall are provided with both sides of the engaging protrusion. Abutment block accommodates and holds A pair of receiving portions that are open and project at least upward, and when the engaging portion of the lock piece and the engaging protrusion are engaged, the pair of abutment blocks are inserted into the pair of receiving portions from above. The operation part provided at the upper end side than the engaging part of the lock piece is inserted and held and is connected to the contact block and the electrical connection box and the attachment box provided by the storage part. The space between the side walls protrudes above the contact block and the upper end surface of the housing portion.

  According to this aspect, in the state in which the pair of contact blocks provided on both sides of the lock piece on one side wall is housed and held in the pair of housing parts provided on the other side wall, the engagement portion of the lock piece By engaging the engaging protrusions of the other wall portion, the attachment box is assembled to the electrical connection box. As a result, the contact block and the accommodating portion abut on a wide area on both sides of the lock piece, and the external force and vibration applied to the attachment box can be dispersedly held in a wide region other than the engagement portion. Therefore, it is possible to stably suppress the rotation of the attached box.

  Further, the abutment block protrudes to the outer peripheral side of the side wall from the lock piece, and is positioned and held in the receiving part of the other side wall on both sides of the lock piece. Therefore, even when an inclined load such as an oblique upper direction is input to the attachment box, the contact block on one side wall is quickly brought into contact with the receiving portion on the other side wall, and the load is dispersed. Will be supported. As a result, it is possible to prevent an excessive load from being directly applied to the lock piece with respect to an input load in any direction, thereby improving the holding stability and durability of the attached box.

  Further, by projecting the abutment block to the outer peripheral side of the side wall from the lock piece, when the engagement part of the lock piece and the engagement protrusion are engaged, that is, the attached box is attached to the side wall of the electrical connection box Thus, while securing a wide space between the side wall of the attachment box and the electrical junction box, the operation portion of the lock piece can be protruded upward in the space. Thereby, it becomes possible to operate the operation part of a lock piece from the upper part of an electrical junction box, and also can perform the engagement release operation by inserting a finger by the wide space between side walls. Therefore, it is possible to remove the attachment box by operating the fingers without using a tool or the like while the electric connection box is attached to the vehicle, and the attachment box detachability can be greatly improved.

  Furthermore, the lock piece provided on the one side wall protrudes from the lower end side of the side wall to the upper end side, and the engagement portion provided on the front end portion thereof and the engagement protrusion provided on the upper end portion of the other side wall. The parts engage with each other. As a result, as compared with the case where a locking piece protruding from the upper end side to the lower end side of the side wall is employed as in the conventional structure, the upper surface (force point) of the attachment box is applied with a load from above on the attachment box. The separation distance of the lock coupling portion (fulcrum) with which the joint portion and the engagement protrusion are engaged can be shortened, and the force applied to the fulcrum can be reduced to further reduce the risk of breakage of the lock piece. .

  Therefore, in this aspect, by adopting a combination of a lock piece protruding from the lower end side of the side wall to the upper end side and a pair of abutment blocks arranged on both sides thereof, the attachment rigidity of the attached box to the electric junction box is improved. And the improvement of the detachability of the attached box can be achieved at the same time.

  According to a second aspect of the present invention, in the electrical junction box with an attachment box according to the first aspect, the lock piece and the pair of contact blocks are provided on a side wall of the attachment box, while the engagement The projecting portion and the pair of accommodating portions are provided on a side wall of the electrical junction box.

  According to this aspect, since the lock piece and the pair of abutment blocks are provided on the side wall of the attachment box, when the attachment box is removed, the operation portion of the lock piece is held with the attachment box held with one hand. The engagement of the engaging portion can be released by placing the finger of one hand. As a result, the detachability can be further improved.

  According to a third aspect of the present invention, in the electrical junction box with an attachment box according to the first or second aspect, each of the pair of abutment blocks is protruded and held on the outer peripheral side of the side wall via a connecting portion. On the other hand, each of the pair of accommodating portions has a bottomed cylindrical shape that opens upward and protrudes from the side wall, and at the intermediate portion in the left-right direction of the outer peripheral surface of the accommodating portion. Openings extending in the up-down direction are provided, and the connecting portions of the pair of contact blocks are respectively inserted into the openings of the pair of housing portions, whereby each corresponding contact block is accommodated in each housing block. In such a storage state, the bottom surface of each contact block is supported by the bottom wall of each storage portion, while the outer side surface and the inner side surface of each corresponding block Each side is inside each housing An outer surface and respectively a side surface is abutting the holding, characterized in that.

  According to this aspect, the contact block can be accommodated and held in the bottomed cylindrical accommodating portion. Therefore, with respect to load input from all directions, the input load can be distributed over a wide range of the side wall through the contact between the contact block and the accommodating portion. Thereby, the attachment rigidity with respect to the electrical junction box of an attachment box can be ensured stably.

  According to the electrical connection box with an attachment box structured according to the present invention, the contact block and the accommodating portion abut on a wide area on both sides of the lock piece, so that the rotation of the attachment box is stably suppressed. Thus, the mounting rigidity of the attachment box with respect to the electric junction box can be improved. In addition, a large space is secured between the both side walls of the electrical junction box and the attachment box, and an operation portion provided at the upper end portion of the lock piece projects upward in the space. Accordingly, it is possible to release the engagement by operating the operation portion of the lock piece of the attached box from above the electrical connection box with fingers, and the attachment box detachability can be greatly improved.

The whole perspective view which shows the electrical junction box with an attachment box as 1st embodiment of this invention. The perspective view which shows the electrical-connection box in this embodiment. The top view of the electrical-connection box shown in FIG. The perspective view which expands and shows the attachment box in this embodiment. The top view of the attachment box shown in FIG. The left view of the attachment box shown in FIG. The principal part enlarged view of the bottom view of the attachment box shown in FIG. The principal part enlarged plan view of the electrical junction box with an attachment box shown in FIG. The enlarged view of the IX-IX cross section of FIG.

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

  First, FIG. 1 shows an electrical connection box 10 with an attachment box as a first embodiment of the present invention. The electrical connection box with attached box 10 of the present embodiment has a structure in which the attached box 14 is attached and fixed to the side surface of the electrical connection box 12 so as to face each other. In the following description, the vertical direction represents the vertical direction in FIG. 1, and the horizontal direction represents the horizontal direction in FIGS.

  The electrical junction box 12 includes a box body 16, an upper case 18, and a lower case 20. Then, the upper case 18 is superimposed and assembled to the box body 16 from one side (upper side in FIG. 1), and the lower case 20 is superimposed and assembled from the other side (lower side in FIG. 1). Each of them is detachably attached to the box body 16 by lock portions 22 and lock portions 23 with release pieces provided at a plurality of locations on the circumference. Each of the box body 16, the upper case 18, and the lower case 20 is an integrally molded product made of synthetic resin.

  The box body 16 of the electrical junction box 12 has a substantially rectangular box shape, and a main circuit body (not shown) made of a conductive member such as a bus bar is accommodated therein, and a fuse or a relay (not shown) Such as electrical parts and wire harnesses are connected. Further, the lower case 20 of the electrical connection box 12 is provided with a plurality of harness outlets 24 penetrating the peripheral wall portion, and the wire harness connected to the circuit body accommodated and held by the box body 16 is connected to the lower case 20. It is led out through the harness outlet 24. A plurality of vehicle fixing portions 26 project from the outer peripheral surface of the box body 16, and the vehicle fixing portions 26 are bolted to a body-side mounting portion (not shown). As shown in FIG. 1, the connection box 10 is arranged in the engine room of the automobile so that the upper case 18 is positioned vertically upward.

  On the other hand, the attachment box 14 includes an attachment box main body 28, an attachment upper case 30, and an attachment lower case 32. The attachment box body 28 is formed in a substantially rectangular box shape that opens up and down, and the attachment upper case 30 is assembled with the upper opening, and the attachment lower case 32 is assembled with the lower opening. Each of them is detachably attached to the attachment box main body 28 by lock portions 34 and lock portions 35 with release pieces provided at a plurality of locations on the circumference. Each of the attached box body 28, the attached upper case 30, and the attached lower case 32 is an integrally molded product made of synthetic resin.

  Next, the mounting structure of the electrical connection box 12 and the attachment box 14 will be described in detail with reference to FIGS. Note that the electrical connection box 12 and the attachment box 14 are attached and fixed by a contact block 56 described later provided on one side wall of the electrical connection box 12 and the attachment box 14, and a storage portion described later provided on the other side wall. 42, an engaging portion 60 of a lock piece 54 described later disposed on the same side as the contact block 56, and an engaging protrusion 40 described later disposed on the same side as the housing portion 42. This is realized by the engagement.

  2 and 3 show the electrical connection box 12 with the attachment box 14 removed from the electrical connection box 10 with attachment box. In the present embodiment, the engagement protrusion 40 and a pair of accommodating portions 42 and 42 are provided on the side wall 38 of the box body 16 of the electrical junction box 12. The engaging protrusion 40 protrudes integrally at the upper end portion in the substantially central portion of the side wall 38 in the longitudinal direction (left and right direction in FIG. 3). It is installed. In addition, the pair of accommodating portions 42, 42 are positioned integrally on both sides of the engaging protrusion 40 in the left-right direction of the side wall 38.

  Each of the pair of accommodating portions 42 and 42 has a substantially rectangular bottomed cylindrical shape as a whole, and has a predetermined width dimension in the left-right direction of the side wall 38 on both sides sandwiching the engaging protrusion 40 therebetween. While extending, the side wall 38 is provided so as to extend from a substantially central portion in the vertical direction to an upper end portion. The lower end portions of the accommodating portions 42 and 42 are covered with bottom walls 44 and 44, respectively, and the upper end portions of the accommodating portions 42 and 42 are opened upward via upper opening portions 46 and 46, respectively. Furthermore, the accommodating parts 42 and 42 are formed with notch-shaped side openings 48 and 48 extending at a predetermined length in the up and down direction at the middle part in the left and right direction of the outer peripheral surface. Therefore, the accommodating portions 42 and 42 are structured to be opened not only on the upper side but also on the side. In particular, in the present embodiment, as shown in FIG. 2, the side opening 48 is formed with a length from the upper end portion of the housing portion 42 to the bottom wall 44. Thereby, the outer peripheral wall of each accommodating portion 42 is divided by the side opening 48 into the first corner 49 a close to the engaging protrusion 40 and the second corner 49 b separated from the engaging protrusion 40. . Further, inside the accommodating portions 42, 42, reinforcing wall portions 50, 50 are formed at the corners adjacent to the engaging protrusions 40 over the entire length in the vertical direction.

  Next, the attachment box 14 is shown slightly enlarged in FIGS. In the present embodiment, a lock piece 54 and a pair of contact blocks 56, 56 are provided on the side wall 52 of the attachment box main body 28. The lock piece 54 is disposed at a position facing the engaging protrusion 40 in a state where the side wall 52 of the attachment box main body 28 is opposed to the assembly position of the side wall 38 of the box main body 16, and a pair of The contact blocks 56 and 56 are arranged at positions facing the pair of accommodating portions 42 and 42.

  Specifically, the lock piece 54 has a base end portion 58 protruding from the lower end portion of the side wall 52 toward the outer peripheral side at a substantially central portion in the longitudinal direction of the side wall 52 (left and right direction in FIG. 5). By being further bent upward, it is substantially L-shaped and protrudes from the lower end side to the upper end side of the side wall 52 so as to extend in parallel with a gap from the side wall 52. In short, the lock piece 54 is connected to and supported by the side wall 52 in a cantilevered state at the base end portion 58, and the distal end portion can be bent and deformed toward the side wall 52 around the base end portion 58.

  An engaging portion 60 that protrudes in a hook shape from the outer surface is integrally formed at the distal end portion of the lock piece 54. The position where the engaging portion 60 is formed in the vertical direction of the lock piece 54 is a pair of accommodating portions 42, 42 provided in the electrical junction box 12 by a pair of abutment blocks 56, 56 provided in the attachment box 14, as will be described later. It is set to a position to be engaged with the engaging protrusion 40 provided in the electrical connection box 12 in a state where it is accommodated and held in the electric connection box 12. Further, an operation portion 62 is provided at the distal end portion (upper end side) of the engagement portion 60 at the distal end portion of the lock piece 54. In particular, in the present embodiment, as shown in FIG. 6 and the like, the operation portion 62 protrudes above the upper end surface of the contact block 52 and is electrically connected as shown in FIG. Projecting upward from the upper end surface of the accommodating portion 42 provided in the box 12.

  On the side wall 52 of the attachment box main body 28, a pair of abutting blocks 56, 56 each having a substantially rectangular column shape are integrally provided so as to be located on both sides of the lock piece 54 in the left-right direction of the side wall 52. The pair of contact blocks 56, 56 have a substantially constant rectangular cross-sectional shape and extend over a predetermined range in the vertical and horizontal directions of the side wall 52. The pair of abutment blocks 56, 56 have a substantially constant longitudinal rectangular cross-sectional shape, and the side wall 52 has a thick connecting portion 66, 66 extending over a predetermined range in the left-right direction and the up-down direction. Protrusively held on the outer peripheral side. Accordingly, as shown in FIG. 5, the protrusion allowance H <b> 2 of the abutment blocks 56, 56 to the outer peripheral side of the side wall 52 is made larger than the protrusion allowance H <b> 1 of the lock piece 54 to the outer peripheral side of the side wall 52. (H2> H1). Each contact block 56 is formed with a vertical dimension smaller than the vertical dimension of the lock piece 54, and the depth dimension (vertical dimension) of the accommodating portion 42 provided in the electrical junction box 12. It is set to be almost the same. The vertical dimension of each connecting portion 66 is set to be substantially the same as the vertical dimension of each contact block 56.

  Further, as is apparent from the bottom view of FIG. 4 which is enlarged in FIG. 7, the connecting portions 66, 66 disposed on both sides of the lock piece 54 are respectively directed from the side wall 52 on the lock piece 54 side toward the lock piece. Side locking walls 68, 68 that extend in the vertical direction are formed with the same vertical dimension as the connecting portion 66. Further, a pair of protective wall portions 70, 70 extending in the vertical direction of the side wall 52 are projected between the side locking walls 68 and the lock pieces 54 of each connecting portion 66. The pair of protective wall portions are also formed with the same vertical dimension as the connecting portion 66.

  Here, the longitudinal dimension L1 and the thickness dimension T1 of each contact block 56 shown in FIG. 5 are the longitudinal dimension L1 ′ and the width in the region where the reinforcing wall part 50 of each accommodating part 42 shown in FIG. 3 is not provided. It is slightly smaller than the dimension T1 ′, and each abutment block 56 can be accommodated in each accommodating portion 42. Further, the plate thickness dimension T2 (see FIG. 7) of the side locking wall 68 of each connecting portion 66 is the dimension T2 ′ between the opposing surfaces of the reinforcing wall portion 50 and the first corner portion 49a of each accommodating portion 42 (FIG. 3). The side locking wall 68 is inserted between the reinforcing wall portion 50 and the first corner portion 49a so as to be accommodated and arranged.

  As shown in FIGS. 4 and 5, the upper ends of the connecting portions 66 and 66 including the side locking walls 68 and 68 and the upper ends of the protective wall portions 70 and 70 are provided by flange portions 72 and 72, respectively. They are connected together. The pair of contact blocks 56, 56 and the connecting portions 66, 66 are provided with a plurality of lightening holes 74, so that the amount of synthetic resin forming the attachment box 14 is reduced and the weight of the attachment box 14 is reduced. The problem of resin sink marks at the time of manufacture has been solved.

  The attachment box 14 is attached to the side wall 38 of the electrical connection box 12 having the above-described structure, and the electrical connection box 10 with the attachment box is configured. As shown in FIGS. 8 and 9, the electrical connection box 12 and the attachment box 14 are fixedly attached to the electrical connection box 12 by a pair of contact blocks 56, 56 provided in the attachment box 14. This is done by inserting from the upper opening 46 of the pair of accommodating portions 42, 42. Here, since each accommodating portion 42 is provided with a side opening 48, the connecting portion 66 of each contact block 56 is inserted into the side opening 48 of each accommodating portion 42, so The contact block 56 can be pushed into the tubular housing portion 42 and housed.

  When the attachment box 14 is inserted further downward, the engagement portion 60 of the lock piece 54 provided in the attachment box 14 is abutted from above the engagement protrusion 40 protruding from the side wall 38 of the electrical connection box 12. Touch. At this time, as shown in FIG. 9, the inclined surface has a protruding amount that increases as the engaging portion 60 of the lock piece 54 moves upward, whereas the protruding amount increases as the engaging protruding portion 36 moves downward. Therefore, as the attachment box 14 is slid downward, the elastically deformable lock piece 54 is gradually bent and deformed toward the attachment box main body 28 side. After that, by further sliding the attachment box 14 downward, the engaging portion 60 gets over the engaging protrusion 40, and the lock piece 54 deformed flexibly returns to its initial shape, whereby the engaging protrusion 40 A locking effect is exhibited by the engaging portion 60.

  Here, the vertical dimension of the contact block 56 is set to be substantially the same as the depth dimension of the accommodating portion, and the longitudinal dimension L1 and the thickness dimension T1 of the abutting block 56 are the longitudinal dimension L1 ′ of the accommodating portion 42. And slightly smaller than the width dimension T1 ′. Therefore, the bottom surface 76 of the abutment block 56 is abutted and supported by the bottom wall 44 of the accommodating portion 42, and the outer side surface 78, the inner side surface 80, and the side surfaces 82, 82 of the abutting block 56 are respectively accommodated in the accommodating portion 42. The inner surface 84, the outer surface 86, and the side surfaces 88, 88 are abutted and supported. Therefore, in the present embodiment, the outer peripheral surface excluding the upper surface of the contact block 56 is in contact with and supported by the inner surface of the housing portion 42 over the entire surface.

  In addition, the plate thickness dimension T2 of the side locking wall 68 of the connecting part 66 is slightly smaller than the dimension T2 ′ between the opposing surfaces of the reinforcing wall part 50 and the first corner part 49a of the accommodating part 42. Therefore, the side locking wall 68 is inserted and held between the reinforcing wall portion 50 and the first corner portion 49a in a contact state. Thereby, the accommodation retainability of the contact block 56 and the accommodating part 42 is ensured stably.

  In this manner, each abutment block 56 is accommodated and disposed in each accommodating portion 42, and the side locking wall 68 of each coupling portion 66 is inserted between the reinforcing wall portion 50 and the first corner portion 49a. In this state, the engaging portion 60 of the lock piece 54 of the attachment box 14 is maintained in the engaged state with respect to the engaging protrusion 40 of the electrical connection box 12.

  As shown in FIG. 9, in the attached state of the electrical connection box 12 and the attachment box 14, the operation portion 62 provided on the upper end side of the engagement portion 60 of the lock piece 54 includes contact blocks 56 and 56. In the space S between the side walls 38 and 52 of the electrical junction box 12 and the attachment box 14 provided by the storage portion 42, the contact block 56 and the upper end surface of the storage portion 42 are projected upward. Therefore, when removing the attachment box 14 from the electrical connection box 10 with attachment box, the operation part 62 of the lock piece 54 can be accessed from above the electrical connection box 10 with attachment box. Then, the operating portion 62 of the lock piece 54 is pressed to the side of the attached box main body 46 with a finger or the like, and the lock piece 54 is bent and deformed to the side of the attached box main body 28, whereby the engagement protrusion 40 and the engagement portion 60 are locked. The effect is released, and the contact block 56 can be pulled out from the upper side where the housing portion 42 is opened. In particular, in this embodiment, since the attachment box 14 is held with one hand, the lock can be released by applying the finger of one hand to the operation portion 62 of the lock piece 54, so that the one-hand attachment box 14 can be removed. It becomes.

  The electrical connection box with attached box 10 of the present embodiment having the above-described structure can exhibit the following effects. That is, when the attachment box 14 is attached to the electrical connection box 12, it is advantageous that the attachment box 14 comes out from above the electrical connection box 12 by locking the engagement protrusion 40 and the engagement portion 60. Can be prevented. In addition, on both sides of the connecting portion of the engaging protrusion 40 and the engaging portion 60, the pair of contact blocks 56 and 56 are accommodated and held in the pair of bottomed cylindrical accommodating portions 42 and 42, so that they have a large area. It is held in contact. As a result, the external force and vibration applied to the attachment box 14 can be distributed and held in a wide area other than the lock piece 54, and the attachment rigidity of the attachment box 14 to the electrical connection box 12 can be improved.

  In particular, in this embodiment, the outer peripheral surface excluding the upper surface of the contact block 56 is in contact with the inner surface of the accommodating portion 42 over the entire surface. Therefore, the input load is distributed and supported with a sufficient contact area between the contact block 56 and the accommodating portion 42 with respect to the load input from various directions to the attachment box 14. Therefore, it is avoided that an excessive load is directly applied to the lock piece 54, and it is advantageous to rotate the attachment box 14 around the coupling portion 60 of the lock piece 54 and the coupling portion of the engagement protrusion 40. To be blocked.

  Also, the protrusion margin H2 of the contact block 56, 56 disposed on both sides of the lock piece 54 to the outer peripheral side of the side wall 52 is made larger than the protrusion margin H1 of the lock piece 54 to the outer peripheral side of the side wall 52. (H2> H1). Therefore, even when an inclined load is input to the attachment box 14 from an obliquely upward direction, any one of the contact blocks 56 quickly contacts the side wall 38 of the electrical connection box 12 via the accommodating portion 42. Contact is made and the load is quickly distributed.

  Furthermore, since the contact block 56 protrudes greatly toward the outer peripheral side of the side wall 52, a large space S between the electrical connection box 12 and the attachment box 14 is secured. In addition, the lock piece 54 protrudes from the lower end side to the upper end side of the side wall 52, and the operation portion 62 of the lock piece 54 is disposed to protrude in the space S. Therefore, it is easy to access the operation portion 62 of the lock piece 54 from above, and a sufficient operation space can be secured. Thereby, the attachment box 14 can be removed by a finger operation while the electrical connection box 12 is attached to the vehicle, and the detachability of the attachment box 14 can be greatly improved.

  In addition, by causing the lock piece 54 to protrude from the lower end side to the upper end side of the side wall 52, the engaging portion 60 provided at the tip end portion of the lock piece 54 is connected to the upper end portion of the side wall 38 of the electrical connection box 12. It can be made to lock-connect with the engaging protrusion 40 provided in this. Therefore, compared to the case where a lock piece protruding from the upper end side to the lower end side of the side wall is employed as in the conventional structure, the upper surface (force point: B) of the attachment box 14 to which a load from above is applied and the lock are locked. The separation distance L between the engaging portion 60 of the piece 54 and the lock coupling portion (fulcrum: A) of the engaging protrusion 40 can be shortened (see FIG. 9). Therefore, the load applied to the lock coupling portion (fulcrum: A) can be reduced, and the breakage of the lock piece 54 can be avoided and the durability can be improved.

  In the present embodiment, the pair of accommodating portions 42, 42 in the electrical connection box 12 are integrally provided in the box body 16, and the pair of contact blocks 56, 56 in the attachment box 14 are provided in the attachment box body 28. Are integrally provided. The box body 16 and the attached box body 28 have a solid structure that accommodates a circuit body therein, and can exhibit greater rigidity than the hollow case-like upper cases 18 and 30 and the lower cases 20 and 32. Therefore, the load transmitted through the contact between the contact block 56 and the accommodating portion 42 can be stably held by the rigid box body 16 and the attached box body 28.

  As mentioned above, although embodiment of this invention was explained in full detail, these are illustration to the last, Comprising: This invention is not limited at all by the specific description in these embodiment.

  For example, in the above-described embodiment, the engagement protrusion 40 and the accommodating portions 42 and 42 are provided on the side wall 38 of the electrical connection box 12, and the lock piece 54 and the abutment blocks 56 and 56 are provided on the side wall 52 of the attachment box 14. However, the lock piece 54 and the contact blocks 56 and 56 may be provided on the electrical connection box 12 side, and the engaging protrusion 40 and the accommodating parts 42 and 42 may be provided on the attachment box 14 side.

  Moreover, in the said embodiment, although a pair of contact blocks 56 and 56 and a pair of accommodating part 42 and 42 which accommodates them were made into the substantially rectangular cross section, it is not limited to this shape.

10: Electrical junction box with attachment box, 12: Electrical junction box, 14: Attachment box, 40: Engagement protrusion, 42: Storage portion, 44: Bottom wall, 46: Upper opening, 48: Side opening, 54: Lock piece, 56: Contact block, 60: Engagement part, 62: Operation part, 66: Connection part, 76: Bottom surface, 78: Outer surface (contact block), 80: Inner surface (contact block) , 82: side surface (contact block), 84: inner side surface (accommodating portion), 86: outer surface (accommodating portion), 88: side surface (accommodating portion)

Claims (3)

In the electrical junction box with an attachment box, wherein the attachment box is attached to the side wall of the electrical junction box,
A locking piece that protrudes from the lower end side of the side wall toward the upper end side is provided on one of the side wall of the electrical junction box and the side wall of the auxiliary box that face each other, and protrudes toward the outer peripheral side of the side wall. A pair of abutment blocks provided on both sides of the lock piece in the left-right direction of the side wall and extending in the up-down and left-right directions of the side wall are provided so as to protrude from the lock piece to the outer peripheral side of the side wall. on the other hand,
On the other side of the side wall of the electrical junction box and the side wall of the attachment box, an engagement protrusion is provided at the upper end of the side wall to engage with the engagement portion provided at the tip of the lock piece. And a pair of accommodating portions that accommodate and hold the abutment block on both sides of the engaging protrusion in the left-right direction of the side wall, and projecting at least upwardly,
When the engagement portion of the lock piece and the engagement protrusion are engaged, the pair of abutment blocks are inserted and held in the pair of storage portions from above, and the engagement portion of the lock piece The operation portion provided on the upper end side is more than the upper surface of the contact block and the storage portion in the space between the contact block and the side wall of the attachment box provided by the storage portion. Protruding upwards,
An electrical junction box with an attached box characterized by the above.   The lock piece and the pair of abutment blocks are provided on a side wall of the attachment box, while the engagement protrusion and the pair of accommodating portions are provided on a side wall of the electrical connection box. Electrical junction box with attached box as described. While each of the pair of abutment blocks has a shape that is protruded and held on the outer peripheral side of the side wall via a connecting portion,
Each of the pair of accommodating portions has a bottomed cylindrical shape that opens upward and protrudes from the side wall, and extends in the middle in the left-right direction on the outer peripheral surface of the accommodating portion. Is provided,
While the connecting portions of the pair of contact blocks are respectively inserted into the openings of the pair of housing portions, the corresponding contact blocks are housed and disposed in the housing portions,
In such a storage state, the bottom surface of each corresponding contact block is supported by the bottom wall of each storage portion, while the outer side surface, the inner side surface, and the side surface of each corresponding contact block are the inner side surface and the outer side surface of each storage portion. The electrical connection box with an attachment box according to claim 1 or 2, wherein the electrical connection box is held in contact with the side surface.

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