WO2018051892A1

WO2018051892A1 - Electrical junction box

Info

Publication number: WO2018051892A1
Application number: PCT/JP2017/032315
Authority: WO
Inventors: 加納　毅大
Original assignee: 住友電装株式会社
Priority date: 2016-09-14
Filing date: 2017-09-07
Publication date: 2018-03-22

Abstract

The purpose of the present invention is to provide an electrical junction box provided with a mounted body that is mounted on a mounting surface of an electrical junction box body, wherein the electrical junction box has an improved structure capable of preventing the occurrence of a weld line, while still enhancing air-tightness, in a lock structure of the mounted body. A second case peripheral wall 44 is provided with lock holes 46, and a first case peripheral wall 60 is provided with lock pieces 66. A lock mechanism is configured as a result of lock claws 70 of the lock pieces 66 being fitted into the lock holes 46. The lock holes 46 are covered by the lock pieces 66 from the outside when the lock claws 70 are fitted into the lock holes 46.

Description

Electrical junction box

The present invention relates to an electrical junction box mounted on an automobile or the like, and more particularly to an electrical junction box in which a separate attachment body such as a control device is assembled to the electrical junction box body and connected by a connector.

As a kind of electrical connection box mounted on an automobile or the like, an electronic control unit such as an ECU containing a control circuit is provided as a separate mounting body as described in, for example, Japanese Patent Application Laid-Open No. 2008-172893 (Patent Document 1). As such, there is known a structure in which this attachment body is detachable from the electric junction box body. According to such an electrical junction box, there is an advantage that the electronic control unit can be easily replaced or changed by making the electronic control unit a separate structure.

By the way, in the electrical junction box composed of the assembly structure of the electrical junction box main body and the mounting body, the corresponding positions of the mounting surface of the electrical junction box main body and the overlapping surface of the mounting body superimposed thereon Is provided with a connector. And by connecting a connector when assembling the attachment body to the electrical junction box body, the electrical circuit provided in the electrical junction box body and the electrical circuit provided in the attachment body are connected to each other. . The attachment body includes a first case and a second case that are assembled to each other, and a circuit board that is accommodated and disposed in an internal space formed therebetween.

In such an electrical junction box mounting body, the overlapping surface that is superimposed on the electrical junction box body mounting surface is constituted by the first case, while the mounting body is assembled to the electrical junction box body. The pressed surface is constituted by the second case. Therefore, it is necessary to make the second case pressed at the time of assembling with a relatively hard material so that it can withstand the pressing force at the time of assembling the attachment body. As a result, in the lock structure of the first case assembled to the second case and the second case of the attachment body, as shown in Patent Document 1, while the lock claw protrudes from the peripheral wall of the second case that is difficult to deform, A peripheral wall of the first case is provided with a substantially U-shaped lock frame projecting in a front view that is easily deformable.

However, since the lock frame provided in the first case of the attachment body has a shape that extends from both ends connected to the peripheral wall of the first case, there is a problem that a weld line is likely to occur during molding. It was. Therefore, it is necessary to use a material with good moldability, which causes a problem that cost increases cannot be avoided. Furthermore, when the chemical resistance of the first case is required, a material with good moldability may not be adopted.

In addition, when a lock structure comprising the lock claw of the second case and the lock frame body of the first case is adopted, as shown in FIG. 1 of JP-A-9-326567 (Patent Document 2), both An internal space formed between the cases communicates with the outside through an engagement hole of the lock frame. Therefore, there has been a risk that moisture or the like enters from the outside and problems such as a short circuit due to condensation occur.

JP 2008-172893 A JP-A-9-326567

Here, the present invention has been made in the background as described above, and the problem to be solved is to lock the mounting body in the electrical connection box provided with the mounting body assembled to the mounting surface of the electrical connection box body. An object of the present invention is to provide an electrical junction box having an improved structure capable of achieving both prevention of the occurrence of a weld line in the structure and improvement of hermeticity.

The first aspect of the present invention is such that the overlapping surface of a separate mounting body is superimposed on the mounting surface of the electrical junction box body and is detachably assembled, and the mounting of the electrical junction box body The connectors provided respectively on the surface and the overlapping surface of the mounting body are connected to each other, while the mounting body includes a first case constituting the overlapping surface, and the first case includes a locking mechanism. In the electrical junction box including the second case assembled via the second case peripheral wall, which is the peripheral wall of the second case, is provided with a lock hole penetrating in the plate thickness direction, while the second case The first case peripheral wall, which is the peripheral wall of the first case that is overlapped and assembled with the outer peripheral surface of the peripheral wall, is provided with a lock piece, and the lock claw protruding from the inner surface of the lock piece is the second case. In front of the case wall The lock mechanism is configured by being fitted into the lock hole, and the second locking piece on the first case peripheral wall is in the state where the lock claw is fitted into the lock hole. The lock hole of the case peripheral wall is covered with a cover from the outside.

According to this aspect, in the mounting body attached to the electrical junction box main body, the lock hole provided in the first case peripheral wall overlapped with the outer surface of the second case peripheral wall while the lock hole is provided in the second case peripheral wall. A lock mechanism was configured by fitting lock claws protruding on the inner surface. As a result, compared to the conventional structure in which a lock frame is provided in the first case, a wider lock piece may be provided in the first case, so that the possibility of forming a weld line due to the shape of the lock piece is reduced. Or can be eliminated. Therefore, even when the first case cannot be manufactured with a material having good moldability for improving the chemical resistance of the first case, the occurrence of molding defects can be advantageously prevented. In addition, since it is not always necessary to select a material with good moldability, the cost can be reduced.

In addition, since the lock hole for forming the hole in the lock mechanism is provided on the second case peripheral wall and covered with a lock piece overlapped on the outer peripheral side, the first case / second of the attachment body is covered. Exposure to the outside of the internal space formed between the two cases can be highly restricted. As a result, it is possible to prevent the occurrence of problems such as external moisture entering the internal space, causing condensation and shorting of the internal circuit.

According to a second aspect of the present invention, in the above-described first aspect, a protruding wall portion that increases the height dimension of the second case peripheral wall is provided above the lock hole. The lock piece is cantilevered with respect to the first case on the base end side by a region sandwiched between a pair of slits opened in the plate thickness direction and projecting end surface of the first case peripheral wall. And a downward extending portion extending downward from the lock claw of the lock piece is more than the lock hole of the peripheral wall of the second case. While being overlapped with the lower portion, an upper extension portion extending upward from the lock claw of the lock piece is overlapped with the protruding wall portion.

According to this aspect, the downward extension portion of the lock piece is overlapped with the lower portion of the lock hole of the second case peripheral wall, while the protruding wall portion is provided above the lock hole to provide the upward extension portion of the lock piece. Since the cover can be stably covered with the lock piece of the lock hole, moisture and water can penetrate further into the internal space. This can advantageously be prevented.

According to a third aspect of the present invention, there is provided the circuit board according to the first or second aspect, wherein an inner space formed between the first case and the second case of the attachment body has a circuit board. The lock hole is formed higher than the upper surface of the circuit board in the height direction of the second case peripheral wall while being supported and disposed by the second case.

According to this aspect, the formation position of the lock hole penetrating the second case peripheral wall of the mounting body is located above the upper surface of the circuit board accommodated in the internal space while being supported by the second case. Is formed. Accordingly, it is possible to advantageously prevent the first case and the circuit board where the condensation tends to be accumulated due to external moisture from being exposed to the outside through the lock hole. Moreover, even if the lock hole is formed higher than the upper surface of the circuit board, since the protruding wall portion is formed above the lock hole, the lock hole is formed relatively upward so that the second case peripheral wall is formed. It is possible to prevent the rigidity from being lowered at the same time.

According to a fourth aspect of the present invention, in the one described in any one of the first to third aspects, a reinforcing rib for preventing warpage of the upper wall is provided on an inner surface of the upper wall of the first case. It is a projecting one.

According to this aspect, since the reinforcing rib for preventing warping of the upper wall is formed on the inner surface of the upper wall of the first case, the upper wall of the first case warps and the first case peripheral wall and the second case It is possible to prevent an adverse effect that the gap between the opposing surfaces of the peripheral wall is displaced. Therefore, the lock hole can be stably covered with the lock piece, and the stable cover can be advantageously held by the overlap of the lock piece and the protruding wall portion.

It should be noted that the reinforcing rib structure can adopt any shape such as a lattice shape extending in both the vertical and horizontal directions or in one direction, and a honeycomb shape.

According to a fifth aspect of the present invention, in the one described in any one of the first to fourth aspects, an internal space formed between the first case and the second case of the attachment body includes: While the circuit board is accommodated and disposed, a through hole is formed in a central portion of the circuit board. The second case protrudes from the bottom wall toward the first case, and a protruding end portion extends through the through hole. A substrate positioning boss inserted and disposed in the hole is provided, and an upper end wall of the first case projects from the position corresponding to the through hole toward the second case, and a protruding end surface has the substrate positioning boss. A receiving-side boss is provided in contact with the projecting end portion or in close proximity with a gap.

According to this aspect, the through hole is formed through the central portion of the circuit board, and the second case is provided with the board positioning boss inserted and disposed in the through hole. A receiving-side boss is provided so that the protruding end surface is in contact with or close to the substrate positioning boss with a gap. Thereby, it is avoided that the external force applied to the first case and the second case is directly applied to the circuit board accommodated therein.

Therefore, in order to elastically deform the lock piece, which is an elastic deformation member in the lock mechanism of the mounting body, even when a large force is required as compared with the lock frame body of the conventional structure, the first case and the second case It is possible to advantageously prevent external force applied during assembly from reaching the circuit board.

Furthermore, when combined with the configuration described in the fourth aspect, even if a pressing force or the like for attaching the attachment body to the attachment surface of the electrical junction box body is applied to the second case, the deformation of the second case Transmission of the pressing force through the case to the circuit board can be advantageously prevented, and improvement in the durability and the like of the electrical junction box can be realized together.

In addition, since the boss is provided at the center portion of the circuit board, the circuit board is efficiently prevented from being bent and deformed due to vibration or the like when the vehicle travels. Therefore, adverse effects on electronic components and the like mounted on the circuit board are advantageously prevented.

According to the present invention, a lock hole is provided in the second case peripheral wall, and a lock claw protruding from the inner surface of the lock piece provided in the first case peripheral wall overlapped with the outer surface of the second case peripheral wall is fitted. Thus, a lock mechanism was configured. Thereby, as compared with the conventional structure, since a wide lock piece may be provided in the first case, the possibility of forming a weld line during molding can be reduced or eliminated. Therefore, even when the first case cannot be manufactured with a material having good moldability, the occurrence of molding defects can be advantageously prevented. Moreover, since it is not always necessary to select a material with good moldability, the cost can be reduced. In addition, since the lock hole is covered with the lock piece, the exposure of the inner space formed between the first case and the second case of the attachment body to the outside can be highly restricted. As a result, it is possible to prevent the occurrence of problems such as external moisture entering the internal space, causing condensation and shorting of the internal circuit.

The perspective view which shows the assembly middle state of the electrical junction box as one Embodiment of this invention. The perspective view seen from the bottom face of the attachment body shown in FIG. The disassembled perspective view of the attachment body shown in FIG. The perspective view seen from the bottom face of the 1st case shown in FIG. The top view of FIG. FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. 5. VII-VII cross-sectional enlarged view in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 7 show an electrical junction box 10 as an embodiment of the present invention. As shown in FIG. 1, the electrical connection box 10 has an electrical connection box main body 12 and a mounting surface 14 provided on the upper surface of the electrical connection box main body 12 so that the overlapping surface 16 is overlapped. And a separate mounting body 18 that is detachably assembled. In the following description, “upper” means the upper side in FIGS. 2 and 3, and “lower” means the lower side in FIGS. 2 and 3. Also, “front” means “right” and “rear” in FIG. 5, the left direction in FIG. 5 is the left and right direction in FIG. 5, and the width direction is the up and down direction in FIG.

As shown in FIG. 1, the electrical junction box body 12 has a structure in which a circuit board (not shown) is accommodated in a case 20 formed of a synthetic resin. The case 20 has a substantially rectangular block shape, and an attachment surface 14 is formed on the upper surface of the case 20, while one of the longitudinal directions (left and right directions in FIG. 1) of the attachment surface 14 (in FIG. 1, An opening hole 22 is provided through the end on the left side. In addition, a pair of

support portions

24 and 24 are provided on the mounting surface 14 at the other end (right side in FIG. 1) opposite to the end provided with the opening hole 22 in the longitudinal direction. Further, a lock portion 28 that fits with a locked portion 52 of the attachment body 18 to be described later is provided on the peripheral wall portion 26 a of the case 20 that extends along the opening hole 22 adjacent to the opening hole 22.

On the other hand, as shown in FIG. 1, a circuit board (not shown) housed in the case 20 is connected to a mounting body side connector 84 (see FIG. 2) 設け provided on the circuit board 40 of the mounting body 18 described later. A main body side connector 30 is provided. The main body side connector 30 extends along one end side in the longitudinal direction of the case 20 (left side in FIG. 1), and is provided on the attachment body 18 with respect to the attachment surface 14 of the case 20 of the electrical junction box main body 12. In a state where the overlapped surfaces 16 face each other so as to be parallel to each other, the projection faces the attachment body side connector 84 at a position facing an attachment body side connector 84 described later. That is, the main body side connector 30 protrudes outward from the opening hole 22 provided in the mounting surface 14 of the electrical junction box main body 12.

Further, the circuit board (not shown) accommodated in the case 20 has the other end side in the longitudinal direction (FIG. 1) opposite to one end side (left side in FIG. 1) in the longitudinal direction in which the main body side connector 30 is disposed. A fuse module 32 is provided on the middle and right side. In the fuse module 32, a plurality of fuse mounting portions 34 are stacked in three stages in the vertical direction and formed in parallel in the longitudinal direction of the fuse module 32. A cover member (not shown) is assembled to the fuse module 32, and the opening of the fuse mounting portion 34 is covered with the cover member so that the inside of the fuse mounting portion 34 is protected.

On the other hand, the attachment body 18 is an electronic control unit of a vehicle such as an ECU, and is attached to and electrically connected to the electrical junction box body 12 as shown in FIG. While receiving the supply, it controls electronic components such as a relay mounted on a circuit board (not shown) in the electrical junction box main body 12. The electrical junction box 10 in the present invention includes a junction block, a fuse box, a relay box, and the like.

As shown in FIG. 3, the mounting body 18 includes a first case 36 constituting the overlapping surface 16 and a second case 38 to which the first case 36 is assembled via a lock mechanism described later. The circuit board 40 is accommodated in an internal space 39 formed between them (see FIGS. 6 to 7).

The second case 38 is an integrally molded product formed of a synthetic resin, and as shown in FIG. 3, upward toward the outer peripheral edge of the bottom wall 42 having a substantially rectangular plate shape. The projecting second case peripheral wall 44 is formed in a substantially box shape that opens upward. In addition, at the four corners of the second case peripheral wall 44, which is the peripheral wall of the second case 38, substantially horizontally long rectangular lock holes 46 extending in the plate thickness direction and extending in the circumferential direction are provided, and surround the lock holes 46. The substantially annular region is thicker than the other regions of the second case peripheral wall 44. Furthermore, by projecting the protruding end portion of the second case peripheral wall 44 further upwards above the lock hole 46, the height dimension of the second case peripheral wall 44 at the portion where the lock hole 46 is formed: H 2 is provided with a projecting wall portion 48 that increases the height dimension of the second case peripheral wall 44 at a portion where the lock hole 46 is not formed: h (see FIG. 3).

In addition, circuit

board support ribs

50a and 50b having a substantially rectangular shape or a substantially C shape in a plan view protruding upward are provided on the outer peripheral edge portion including the four corners of the bottom wall 42 of the second case 38. On the other hand, in the region of the bottom wall 42 where the portion of the circuit board 40 on which the side connection connector 90 and the attachment body side connector 84 described later are mounted, the side connection connector 90 and the attachment body side connector 84 are provided. A circuit board support rib 50c having a substantially rectangular frame shape in a plan view is provided. Furthermore, the second case peripheral wall 44a on one end side in the length direction of the second case 38 (in the diagonally lower right side in FIG. 3) has a locked portion 52 that fits with the lock portion 28 of the electrical junction box body 12. A pair of rotating portions 54 are provided at both ends of the second case peripheral wall 44c on the other end side (the diagonally upper left side in FIG. 3) opposite to one end side in the length direction of the second case 38. , 54 are projected. In addition, a substantially hollow cylindrical substrate positioning boss 56 that protrudes upward and opens upward is provided at the center of the bottom wall 42 of the second case 38.

On the other hand, the first case 36 is an integrally molded product made of synthetic resin, and as shown in FIGS. 3 and 4, the outer peripheral edge of the upper wall 58 having a substantially rectangular plate shape. Further, a first case peripheral wall 60 protruding downward (on the second case 38 side) is formed, and has a substantially box shape opening downward. The first case 36 has a substantially rectangular notch-shaped side opening window 62 that opens outwardly on the first case peripheral wall 60d on one side in the width direction (lower left in FIG. 3). Has a structured. In addition, at the four corners of the first case peripheral wall 60 that is the peripheral wall of the first case 36, openings in the plate thickness direction of the first case peripheral wall 60 and the protruding end surface are provided at locations corresponding to the lock holes 46 in the second case peripheral wall 44. A lock piece 66 is configured by a region sandwiched between a pair of

slits

64 and 64 provided in the manner described above. The lock piece 66 is elastically deformable in the thickness direction of the first case peripheral wall 60 by connecting the base end side of the lock piece 66 to the first case peripheral wall 60 of the first case 36 in a cantilever shape. ing. Further, as shown in FIG. 4 and FIG. 6, the inner surface 68 of the lock piece 66 protrudes in the middle in the vertical direction in a substantially triangular cross-sectional shape (see FIG. 6) and extends in the circumferential direction. While a lock claw 70 is provided, a recess 72 that extends over substantially the entire circumferential length of the lock claw 70 and opens inward is formed immediately above the lock claw 70. The recess 72 has a problem in that the adhesion between the inner surface 68 of the lock piece 66 and the outer peripheral surface of the second case peripheral wall 44 in which the lock hole 46 is formed deteriorates when the base end side of the lock claw 70 is pulled. Can be advantageously prevented. As a result, the lock claw 70 can be more reliably fitted into the lock hole 46 provided in the second case peripheral wall 44. As described above, in this embodiment, the lock claw 70 is fitted into the lock hole 46 so that the lock mechanism is configured.

In addition, as shown in FIG. 3, the upper surface of the upper wall 58 of the first case 36 forms the overlapping surface 16, while one end side in the length direction of the overlapping surface 16 ( In FIG. 3, an opening hole 74 having a substantially horizontally long rectangular shape extending in a plan view extending along one end portion is provided in the diagonally lower right side. As shown in FIG. 4, the opening hole 74 is provided with an opening hole extending portion 76 having a substantially rectangular tube shape protruding from the outer peripheral edge portion toward the second case 38. A pair of substantially rectangular flat plate-shaped connector pressing ribs 78 projecting inwardly at the center in the longitudinal direction of the opening hole 74 are provided at the extending end of the opening hole extending portion 76. (See FIG. 4). Further, the inner surface of the upper wall 58 of the first case 36 is provided with substantially lattice-shaped reinforcing ribs 80 protruding downward (on the second case 38 side) over substantially the entire surface of the upper wall 58. On the other hand, a receiving side boss 82 that protrudes downward (on the second case 38 side) is provided at the center of the inner surface of the upper wall 58 while preventing warping. The receiving-side boss 82 protrudes outwardly from a substantially hollow cylindrical body portion 82a that opens downward, and from a circumferentially equidistant position on the outer surface of the cylindrical body portion 82a, and at the distal end side (in FIG. 4). , Four support legs 82b extending on the upper wall 58 so that the cross-sectional area gradually increases from the upper end side to the base end side (lower end side in FIG. 4). .

As shown in FIG. 3, the circuit board 40 has a substantially rectangular plate shape, and various electric components (not shown) such as relays and capacitors are appropriately mounted on the center of the circuit board 40. Has been. The circuit board 40 is provided with an attachment-side connector 84 that is connected to the main body-side connector 30 provided on a circuit board (not shown) of the electrical junction box main body 12. The attachment body-side connector 84 extends along the outer peripheral portion 86a on one side of the circuit board 40, and the circuit board 40 is disposed inside the first case 36 and the second case 38 as shown in FIG. In the accommodated state, it projects outwardly from an opening hole 74 provided in the overlapping surface 16 of the mounting body 18. Further, a side connection type connector 90 having three connector mounting portions 88 that open toward the side is disposed on one side of the outer peripheral portion 86d (see FIG. 3) orthogonal to the outer peripheral portion 86a of the circuit board 40. ing. Furthermore, a substantially circular through-hole 92 is formed through the central portion of the circuit board 40 in a plan view that penetrates in the thickness direction.

When assembling the mounting body 18 having such a configuration, as shown in FIG. 3, first, the second case 38 is arranged so as to open upward, and then provided to the second case 38. The circuit board 40 is accommodated and arranged on the circuit

board support ribs

50a, 50b, 50c. Next, the first case 36 and the second case of the mounting body 18 are assembled to the second case 38 in which the circuit board 40 is accommodated and arranged from above with the first case 36 opened downward. The circuit board 40 is accommodated and arranged in an internal space 39 formed between the two cases 38 while being supported by the second case 38. More specifically, as shown in FIG. 6, the first case 36 is pushed downward with the inner surface of the first case peripheral wall 60 overlapped with the outer peripheral surface of the second case peripheral wall 44. As a result, the lock claw 70 protruding from the inner surface 68 of the lock piece 66 of the first case peripheral wall 60 comes into contact with the outer peripheral surface of the second case peripheral wall 44 and the lock piece 66 is elastically deformed outward. Pushing the first case 36 further downward is allowed. Here, a taper surface 94 is formed on the outer surface of the projecting end portion side of the projecting wall portion 48 provided on the lock hole 46, and the lower surface of the lock claw 70 is formed on the inner surface. Since the tapered surface 96 is inclined obliquely upward, elastic deformation can be performed more smoothly with less force. Subsequently, when the first case 36 is pushed downward, the lock claw 70 passes over the lock hole 46 and the lock piece 66 is elastically restored so that the lock claw 70 is fitted in the lock hole 46 and the second claw 70 is engaged. The inner surface of the first case peripheral wall 60 is superimposed on the outer peripheral surface of the case peripheral wall 44 and assembled (see FIG. 6).

In the state in which the lock claw 70 is fitted in the lock hole 46 as described above, the lock piece 66 provided on the first case peripheral wall 60 is provided on the second case peripheral wall 44 as shown in FIG. The lock hole 46 is covered with a cover from the outside. Moreover, a downward extending portion 98 extending downward from the lock claw 70 of the lock piece 66 is overlapped with a portion below the lock hole 46 of the second case peripheral wall 44, while An upward extending portion 100 extending upward from the lock claw 70 of the piece 66 is overlapped with the protruding wall portion 48 of the portion above the lock hole 46 of the second case peripheral wall 44. In addition, as shown in FIG. 6, the lock hole 46 is formed above the upper surface 102 of the circuit board 40 in the height direction of the second case peripheral wall 44.

Further, as shown in FIG. 7, the bottom wall 42 of the second case 38 is provided with a substrate positioning boss 56 protruding upward (on the first case 36 side). 56 protruding end portions are inserted and disposed in the through holes 92 of the circuit board 40 in a loosely fitted state. The upper wall 58 of the first case 36 is provided with a receiving-side boss 82 that protrudes downward (on the second case 38 side) from a position corresponding to the through hole 92 of the circuit board 40. The protruding end surface of the side boss 82 is disposed close to the protruding end portion of the substrate positioning boss 56 with a gap 104 therebetween.

Assembling the electrical junction box main body 12 and the mounting body 18 having the above-described structure is as follows. First, the overlapping surface 16 of the mounting body 18 is attached to the mounting surface 14 of the electrical junction box main body 12 as shown in FIG. The pair of

rotating portions

54 and 54 are inserted into the pair of

support portions

24 and 24 of the electrical junction box main body 12 in the direction opposed to each other. Thereby, a hinge mechanism is comprised by a pair of

rotation parts

54 and 54 provided in the other end side of the attachment body 18, and a pair of

support parts

24 and 24 provided in the other end side of the attachment surface 14. FIG. That is, the mounting surface 14 and the other end side of the mounting body 18 are rotatably assembled via a detachable hinge mechanism.

Then, by rotating the mounting body 18 around the pair of

rotating portions

54, 54, the mounting body 18 is superimposed on the mounting surface 14 of the electrical junction box body 12 and assembled. As a result, the locked portion 52 provided on one end side of the attachment body 18 is fitted to the lock portion 28 provided on the same one end side of the electrical connection box body 12, so that the attachment body 18 is electrically connected to the electrical connection box body. 12 to complete the assembly. In this assembled state, the attachment body side connector 84 protruding from the overlapping surface 16 of the attachment body 18 is inserted into the inside of the main body side connector 30 protruding from the attachment surface 14 of the electrical junction box body 12, and the main body side Terminals (not shown) arranged in the connector 30 are connected to female terminals (not shown) arranged in the attachment-side connector 84. Thereby, the circuit board (not shown) in the electrical junction box main body 12 and the circuit board 40 in the mounting body 18 are electrically connected. Further, as shown in FIGS. 1 and 2, in such an assembled state, the outer peripheral portion 86 d of the circuit board 40 faces sideways through the side opening window 62 penetrating the side surface of the mounting body 18. The protruding side connection type connector 90 protrudes outward, and a connector (not shown) is connected to the connector mounting portion 88 of the side connection type connector 90.

According to the electrical junction box 10 having such a structure, in the mounting body 18 attached to the electrical junction box body 12, the second case peripheral wall 44 is provided with the lock hole 46, while the second case A lock piece 66 is configured by a region sandwiched between a pair of

slits

64 and 64 in the first case peripheral wall 60 that is assembled by being overlapped with the outer peripheral surface of the peripheral wall 44. The lock piece 66 is elastically deformable in the thickness direction of the first case peripheral wall 60 by connecting the base end side of the lock piece 66 to the first case peripheral wall 60 in a cantilever shape. A lock claw 70 is provided on the inner surface 68. The lock claw 70 is fitted into the lock hole 46 to constitute a lock mechanism. Therefore, as compared with the conventional structure in which the first case is provided with a lock frame body as one lock mechanism, the first case 36 may be provided with a wide lock piece 66 as one lock mechanism. Therefore, the possibility of forming a weld line during molding can be reduced or eliminated by the shape of one of the lock mechanisms. Therefore, even when it is not possible to use a material with good moldability for the first case 36 in order to improve the chemical resistance of the first case 36, occurrence of molding defects in the first case 36 is advantageously prevented. can do. Further, since it is not always necessary to select a material with good moldability for the first case 36, the cost can be reduced.

Moreover, in a state where the lock claw 70 is fitted in the lock hole 46, the lock hole 46 provided in the second case peripheral wall 44 is covered from the outside by the lock piece 66 provided in the first case peripheral wall 60. Therefore, the exposure of the mounting body 18 to the outside of the internal space 39 formed between the first case 36 and the second case 38 can be highly restricted. Therefore, it is possible to prevent the occurrence of problems such as external moisture entering into the internal space 39 where the moisture is condensing, causing condensation and short-circuiting the internal circuit provided in the circuit board 40. In addition, the downward extension portion 98 of the lock piece 66 is overlapped with a portion below the lock hole 46 of the second case peripheral wall 44, while the upward extension portion 100 of the lock piece 66 is overlapped. Since the second case peripheral wall 44 is overlapped with the protruding wall portion 48 in the upper part of the lock hole 46, the cover covering state of the lock hole 46 by the lock piece 66 is stably maintained. Therefore, it is possible to more advantageously prevent moisture and water from entering the internal space 39.

Further, the formation position of the lock hole 46 provided in the second case peripheral wall 44 is formed above the upper surface 102 of the circuit board 40 accommodated in the internal space 39 while being supported by the second case 38. Has been. Therefore, it is possible to advantageously prevent the exposed space between the inner surface of the upper wall 58 of the first case 36 and the upper surface 102 of the circuit board 40 from being exposed to the outside through the lock hole 46, where condensation easily accumulates due to external moisture. . In addition, even if the lock hole 46 is formed at a position higher than the upper surface 102 of the circuit board 40, the protruding wall 48 protrudes above the lock hole 46. It is possible to prevent the rigidity of the second case peripheral wall 44 from being lowered at the same time by forming a relatively upper portion.

In addition, a through hole 92 is formed through the central portion of the circuit board 40, while a protruding end portion is inserted into the through hole 92 on the bottom wall 42 of the second case 38. Further, a receiving-side boss 82 whose protruding end face is disposed close to the substrate positioning boss 56 with a gap 104 therebetween is provided on the upper wall 58 of the first case 36. Therefore, when an external force is applied to the first case 36 or the second case 38, the board positioning boss 56 and the receiving-side boss 82 that are disposed close to each other come into contact with each other. It is possible to avoid being directly applied to the circuit board 40 accommodated between the case 36 and the second case 38. Moreover, in order to elastically deform the lock piece 66 constituting the lock mechanism of the first case 36 of the attachment body 18, even if a larger force than the lock frame body of the conventional structure is required, the attachment body 18. The external force applied to the first case 36 and the second case 38 when assembling the circuit board 40 can be advantageously prevented. Furthermore, since the board positioning boss 56 and the receiving boss 82 are provided in the center portion of the circuit board 40, for example, the circuit board 40 is efficiently prevented from being bent and deformed due to vibrations during traveling of the vehicle. An adverse effect on electronic components and the like mounted on the circuit board 40 is advantageously prevented.

Further, by providing substantially lattice-like reinforcing ribs 80 on the inner surface of the upper wall 58 of the first case 36 over the entire surface, the warp of the upper wall 58 is prevented. Thereby, the upper wall 58 of the first case 36 is warped, so that it is possible to prevent an adverse effect that the gap between the facing surfaces of the first case peripheral wall 60 and the second case peripheral wall 44 changes. It has become. Therefore, a sufficient allowance for overlapping the lock piece 66 and the second case peripheral wall 44 constituting the lock hole 46 can be secured, so that the lock hole 46 can be stably covered with the lock piece 66. It is. Moreover, even when a pressing force or the like is applied to the second case 38 as in the case where the attachment body 18 is attached to the attachment surface 14 of the electrical junction box body 12, the deformation of the second case 38 or the second case 38 Since the transmission of the pressing force to the circuit board 40 via 38 can be advantageously prevented, the durability and the like of the electrical junction box 10 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, in the above embodiment, the protruding wall portion 48 is provided only at the upper portion of the portion where the lock hole 46 is formed, but the protruding wall portion 48 is also provided at the upper portion of the portion where the lock hole 46 is not formed. It may be. In the above embodiment, the reinforcing ribs 80 projecting from the inner surface of the upper wall 58 of the first case 36 have a substantially lattice shape. However, the reinforcing rib 80 has a lattice shape or a honeycomb shape extending in one direction. A reinforcing rib 80 having an arbitrary shape can also be used. Further, in the above-described embodiment, the protruding end surface of the receiving boss 82 is disposed close to the protruding end portion of the substrate positioning boss 56 with a gap 104 therebetween, but the protruding end surface of the receiving boss 82 is the substrate positioning boss 56. You may contact | abut with respect to the protrusion edge part.

10: electrical junction box, 12: electrical junction box main body, 14: mounting surface, 16: overlapping surface, 18: mounting body, 30: main body side connector (connector), 36: first case, 38: second case, 40: Circuit board, 42: Bottom wall, 44, 44a to d: Second case peripheral wall, 46: Lock hole (lock mechanism), 48: Projection wall part, 56: Board positioning boss, 58: Upper wall, 60, 60a D: first case peripheral wall, 64: slit, 66: lock piece, 68: inner surface, 70: lock claw (lock mechanism), 80: reinforcing rib, 82: receiving side boss, 84: attachment body side connector (connector), 92: Through-hole, 98: Lower extension part, 100: Upper extension part, 102: Upper surface, 104: Gap

Claims

The overlapping surface of a separate mounting body is overlapped with the mounting surface of the electrical junction box main body and is detachably assembled, and the overlapping of the mounting surface of the electrical junction box body and the mounting body And the attachment body includes a first case constituting the overlapping surface and a second case in which the first case is assembled via a lock mechanism. In the electrical junction box
While the second case peripheral wall, which is the peripheral wall of the second case, is provided with a lock hole penetrating in the thickness direction,
A lock piece is provided on the first case peripheral wall, which is a peripheral wall of the first case, which is overlapped and assembled on the outer peripheral surface of the second case peripheral wall, and a lock claw protruding from the inner surface of the lock piece The lock mechanism is configured by fitting into the lock hole of the peripheral wall of the second case,
The electrical connection box, wherein the lock hole of the second case peripheral wall is covered with a cover by the lock piece of the first case peripheral wall in a state where the lock claw is fitted in the lock hole. .
On the upper side of the lock hole, there is provided a protruding wall part that increases the height dimension of the second case peripheral wall,
The lock piece is cantilevered with respect to the first case on the base end side by a region sandwiched between a pair of slits opened in the plate thickness direction and projecting end surface of the first case peripheral wall. Is provided in a state that is elastically deformable in the plate thickness direction.
A downwardly extending portion extending downward from the lock claw of the lock piece is overlapped with a lower portion of the lock hole of the second case peripheral wall, while being upward from the lock claw of the lock piece. The electrical connection box according to claim 1, wherein an upward extending portion extending to the top is superimposed on the protruding wall portion.
In the internal space formed between the first case and the second case of the mounting body, the circuit board is supported and disposed by the second case, while the height direction of the peripheral wall of the second case The electrical connection box according to claim 1, wherein the lock hole is formed higher than the upper surface of the circuit board.
The electrical junction box according to any one of claims 1 to 3, wherein a reinforcing rib for preventing warpage of the upper wall is provided on the inner surface of the upper wall of the first case.
In the internal space formed between the first case and the second case of the mounting body, a circuit board is accommodated and disposed.
A through hole is provided in a central portion of the circuit board,
The second case is provided with a substrate positioning boss that protrudes from the bottom wall toward the first case and has a protruding end portion inserted into the through hole. A receiving boss is provided that protrudes from the position corresponding to the through hole toward the second case and has a protruding end surface that is in contact with or close to the protruding end of the substrate positioning boss with a gap. The electrical junction box according to any one of claims 1 to 4.