JP6432741B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box in which a circuit board is accommodated in a case, and more particularly to an electrical junction box to which electrical components are connected from the side of the case.

  2. Description of the Related Art Conventionally, an electrical connection box is known in which a printed circuit board, which is a circuit board, is accommodated in a case, and a board terminal provided on the printed circuit board can be connected to an electrical component such as a fuse. In particular, in recent years, with the demand for increasing the space efficiency and density of the electrical junction box, the side of the electrical junction box is provided with a side component connecting portion having a plurality of electrical component mounting portions that open to the side. It has been known. For example, the one described in Japanese Patent Application Laid-Open No. 2014-165960 (Patent Document 1).

  In such an electrical junction box, as shown in FIG. 3 of Patent Document 1, a plurality of board terminals erected with one end soldered to a printed circuit board are arranged at intermediate portions thereof. It is bent in an L shape, and a connecting portion provided at the other end of the board terminal protrudes toward the side edge of the printed board. And the connection part provided in the other end part of a plurality of substrate terminals is stored in the electric part mounting part of the side part connection part in a state of being arranged in the width direction and the height direction of the side part connection part. It is arranged. Thereby, from the side of the electrical connection box, an electrical component such as a fuse can be mounted on the electrical component mounting portion of the side component connecting portion so that the electrical component is conducted to the printed circuit board via the board terminal. It has become.

  By the way, in order to accommodate a printed circuit board on which such a side component connecting portion is mounted in the case and connect an electrical component from the side, an opening that exposes the side component connecting portion on the side of the case is provided. It is necessary to provide a part. Specifically, as shown in FIG. 1 of Patent Document 1, a lower case that holds a printed circuit board, and an upper case that is assembled from above the lower case and forms an internal space that accommodates the printed circuit board between the lower case and Therefore, it is necessary to provide a notch-shaped side opening that opens to the lower case side in the peripheral wall portion of the upper case, and to expose the side part connecting portion to the outside from the side opening.

  However, when a cutout side opening that opens toward the lower case is provided in the peripheral wall of the upper case, a part of the peripheral wall of the upper case is divided by the side opening at the tip side. Therefore, due to the difference in rigidity between the distal end side and the proximal end side of the peripheral wall portion, the pair of divided peripheral wall portions positioned on both sides of the side opening portion are displaced so as to fall inside the side opening portion on their distal end side. The problem of being easy to do was inherent. For this reason, when assembling the upper case from above the lower case with the printed circuit board disposed in the lower case, the front ends of the pair of divided peripheral walls displaced to the inside of the side openings are connected to the side part connection parts and other parts. There is a risk that the normal assembly of both cases may be hindered by interfering with the components on the printed circuit board or being inserted inward from a predetermined position in the lower case.

JP 2014-165960 A

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved thereof is an electrical connection box that accommodates a circuit board on which the side component connection portion is mounted. An object of the present invention is to provide an electrical junction box having a novel structure capable of improving the assemblability of a case provided with a side opening to be exposed.

According to a first aspect of the present invention, the circuit board is mounted between the first case that holds the circuit board on which the side component connecting portion is mounted, and the first case that is assembled to the first case. A second case that constitutes a housing space for housing the housing, and a peripheral side wall portion of the second case is provided with a notch-shaped side opening that opens to the first case side, and both end sides of the side opening are In the electrical junction box that is a divided peripheral wall portion and the side part connection portion is exposed to the outside from the side opening, a pair of displacement prevention portions are provided on the first case side, When the distal end portion of the divided peripheral wall portion of the second case is displaced inward of the side opening, the distal end portion of the divided peripheral wall portion abuts against the displacement preventing portion, and the divided peripheral wall portion displacement of the inwardly are adapted to be corrected, before At least one of the pair of displacement preventing portions is provided on the side of the side component connecting portion protruding from the side edge portion of the circuit board, and on the protruding end surface of the fixing cylinder portion. And a tapered surface inclined downward and obliquely outward with respect to the width direction of the opening .

  According to this aspect, the pair of displacement prevention portions that respectively contact the distal end portions of the divided peripheral wall portions displaced inward of the side opening of the second case and correct the inward displacement of the divided peripheral wall portions. It is provided on the first case side. Accordingly, when the second case is assembled to the first case in which the circuit board is accommodated and held, even if the inward displacement of the divided peripheral wall portion occurs, the normal assembly operation is performed. As a result, the distal end portion of the divided peripheral wall portion on the first case abuts against the displacement preventing portion, and the inward displacement of the divided peripheral wall portion is corrected. As a result, both cases can be reliably and easily assembled in the normal state.

  It should be noted that the pair of displacement prevention portions provided on the first case side only need to be provided at portions that respectively contact the distal end portion on the first case side of the divided peripheral wall portion displaced inward. You may comprise using the member which comprises a direction component connection part, and you may comprise using the other member located in the vicinity of a division | segmentation surrounding wall part. Moreover, a pair of displacement prevention part may be comprised in the mutually same shape, and may be comprised in a different shape. In addition, a known arbitrary circuit board such as a printed board or a bus bar circuit body can be adopted as the circuit board.

  According to this aspect, the displacement preventing portion utilizes the existing fixing cylinder provided at the side edge of the side part connecting portion, and the width direction of the side opening on the protruding end surface of the fixing cylinder On the other hand, the displacement preventing portion can be provided by a simple structure in which only a tapered surface inclined obliquely outward is provided. Thereby, the displacement prevention part can be formed without increasing the number of parts, and the displacement prevention part can be provided at a low cost with a simple structure.

  In particular, since the protruding end surface of the fixing cylinder portion is a tapered surface inclined obliquely outwardly with respect to the width direction of the side opening, it is displaced inward of the side opening of the first case. When the distal end portion of the divided peripheral wall portion comes into contact with the protruding end surface of the fixing cylinder portion, the distal end portion of the divided peripheral wall portion is smoothly displaced outward. As a result, the inward displacement of the divided peripheral wall can be reliably corrected, and the assembly workability and stability can be further improved.

According to a second aspect of the present invention, the circuit board is mounted between the first case that holds the circuit board on which the side component connecting portion is mounted and the first case that is assembled to the first case. A second case that constitutes a housing space for housing the housing, and a peripheral side wall portion of the second case is provided with a notch-shaped side opening that opens to the first case side, and both end sides of the side opening are In the electrical junction box that is a divided peripheral wall portion and the side part connection portion is exposed to the outside from the side opening, a pair of displacement prevention portions are provided on the first case side, When the distal end portion of the divided peripheral wall portion of the second case is displaced inward of the side opening, the distal end portion of the divided peripheral wall portion abuts against the displacement preventing portion, and the divided peripheral wall portion displacement of the inwardly are adapted to be corrected, before At least one of the pair of displacement preventing portions is provided on the projecting end surface of the guide projection, which is integrally provided on the peripheral wall portion of the other component disposed in the vicinity of the side component connecting portion. characterized in that it is configured to include a, a tapered surface inclined downward obliquely outwards with respect to the width direction of the side opening.

According to this aspect, the pair of displacement prevention portions that respectively contact the distal end portions of the divided peripheral wall portions displaced inward of the side opening of the second case and correct the inward displacement of the divided peripheral wall portions. It is provided on the first case side. Accordingly, when the second case is assembled to the first case in which the circuit board is accommodated and held, even if the inward displacement of the divided peripheral wall portion occurs, the normal assembly operation is performed. As a result, the distal end portion of the divided peripheral wall portion on the first case abuts against the displacement preventing portion, and the inward displacement of the divided peripheral wall portion is corrected. As a result, both cases can be reliably and easily assembled in the normal state. It should be noted that the pair of displacement prevention portions provided on the first case side only need to be provided at portions that respectively contact the distal end portion on the first case side of the divided peripheral wall portion displaced inward. You may comprise using the member which comprises a direction component connection part, and you may comprise using the other member located in the vicinity of a division | segmentation surrounding wall part. Moreover, a pair of displacement prevention part may be comprised in the mutually same shape, and may be comprised in a different shape. In addition, a known arbitrary circuit board such as a printed board or a bus bar circuit body can be adopted as the circuit board. Further, the displacement preventing portion uses a peripheral wall portion of another component disposed in the vicinity of the side component connecting portion, and a guide protrusion is integrally provided on the peripheral wall portion. The displacement preventing portion can be provided by a simple structure in which a taper surface inclined downward obliquely outward with respect to the width direction of the side opening is provided on the protruding end surface. Thereby, the displacement prevention part can be formed without increasing the number of parts only by changing the shape of the other parts, and the displacement prevention part can be provided at a low cost with a simple structure.

  In particular, since the protruding end surface of the guide protrusion is a tapered surface inclined obliquely outwardly with respect to the width direction of the side opening, the divided peripheral wall displaced inward of the side opening of the first case When the tip of the part comes into contact with the protruding end surface of the fixing cylinder, the tip of the divided peripheral wall is smoothly displaced outward. As a result, the inward displacement of the divided peripheral wall can be reliably corrected, and the assembly workability and stability can be further improved.

  According to the present invention, the divided peripheral wall portion displaced inward of the side opening of the second case is brought into contact with the distal end portion on the first case side to correct the inward displacement of the divided peripheral wall portion. A pair of displacement prevention portions is provided on the first case side. As a result, when the second case is assembled to the first case, even if the inward displacement of the divided peripheral wall portion occurs, the tip of the divided peripheral wall portion can be obtained only by performing normal assembly work. The portion comes into contact with the displacement preventing portion, and the inward displacement of the divided peripheral wall portion is corrected. As a result, both cases can be reliably and simply assembled in a normal state.

The disassembled perspective view which shows the electrical-connection box as one Embodiment of this invention. The perspective view of the assembly | attachment state of the electrical-connection box shown in FIG. FIG. 2 is a perspective view immediately before assembling the upper case of the electrical junction box shown in FIG. 1. The exploded perspective view seen from another direction of the electric junction box shown in FIG.

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

  1-4 show an electrical junction box 10 as an embodiment of the present invention. The electrical junction box 10 is a second case that constitutes a housing space for housing a printed circuit board 14 that is a circuit board between the lower case 12 that is a first case and the lower case 12 by being assembled to the lower case 12. And an upper case 16. Here, both the lower case 12 and the upper case 16 are integrally formed by injection molding or the like with a synthetic resin such as polypropylene (PP) or polyamide (PA). In the following description, unless otherwise specified, “upper” means the upper case 16 side, and “lower” means the lower case 12 side.

  As shown in FIG. 1, the lower case 12 has a substantially box-like shape that is open upward, with a peripheral wall 20 projecting upward formed on the outer peripheral edge of a bottom wall 18 having a substantially rectangular plate shape. It is said that. The printed circuit board 14 is placed and held on the bottom wall 18 surrounded by the peripheral wall 20. In addition, locked portions (not shown) are provided at the four corners of the lower case 12, and the lower case 12 and the upper case 16 are held in an assembled state by being fitted to a lock portion 64 of the upper case 16 described later. It has become.

  The printed circuit board 14 has a substantially rectangular plate shape, and various electrical components such as a relay 22 and a resistor 24 are appropriately provided at the center of the printed circuit board 14. A fuse module 28 that is a side component connecting portion is mounted on an outer peripheral portion 26a (see FIGS. 1 and 4) on one side of the printed circuit board 14. A plurality of fuse mounting portions 29 are formed in the fuse module 28 so as to be aligned in the longitudinal direction of the fuse module 28. A cover member 30 is assembled to the fuse module 28, and the opening of the fuse mounting portion 29 is covered with the cover member 30 so that the inside of the fuse mounting portion 29 is protected. The fuse module 28 is provided with a fixing cylinder portion 32 protruding upward at both side edges in the longitudinal direction. The fuse module 28 is fixed to the printed circuit board 14 by screwing a bolt (not shown) from the lower surface side of the printed circuit board 14 into the bolt hole 34 penetrating the fixing cylinder portion 32. The peripheral edge portion of the protruding end surface 36 of one of the fixing cylinder portions 32 (right side in FIGS. 3 to 4) is inclined with respect to the longitudinal direction of the fuse module 28 (the width direction of the side opening 58 described later). A tapered surface 38 inclined downward is formed (see FIG. 4).

  In the printed circuit board 14, a connector mounting portion 40, which is another component, is disposed in the vicinity of the fuse module 28 on an outer peripheral portion 26 b (see FIG. 1) on one side orthogonal to the outer peripheral portion 26 a. The connector mounting portion 40 is an integrally molded product having a longitudinal shape made of synthetic resin. In the connector mounting portion 40, two connector housing portions 42 having a substantially rectangular concave shape opening toward the outside of the printed circuit board 14 are formed adjacent to each other in the longitudinal direction. A plurality of board terminals (not shown) bent in an L shape are inserted into these connector housing portions 42 to form side connection type connectors 44. In the connector mounting portion 40, a guide projection 48 having a substantially rectangular cross-sectional shape is integrally provided on a peripheral wall portion 46 located in the vicinity of the fuse module 28. A tapered surface 52 is formed on the peripheral edge portion of the protruding end surface 50 of the guide protrusion 48 so as to be inclined obliquely outwardly with respect to the longitudinal direction of the fuse module 28 (the width direction of a side opening 58 described later). (See FIG. 3).

  As shown in FIGS. 3 and 4, the upper case 16 is formed with a substantially rectangular plate-shaped upper wall 54 formed with a peripheral wall portion 56 projecting downward on the outer peripheral edge portion of the upper wall 54. It has a substantially box shape. The peripheral wall portion 56a on one end side in the longitudinal direction of the upper case 16 is provided with a substantially rectangular notch-shaped side opening 58 that opens downward (on the lower case 12 side). Both end sides are divided peripheral wall portions 60. Further, a substantially rectangular notch 62 that opens downward (on the lower case 12 side) is provided on the peripheral wall 56b orthogonal to the peripheral wall 56a on one end side in the longitudinal direction of the upper case 16 (see FIG. 3). ). Further, lock portions 64 are provided at the four corners of the peripheral wall portion 56 of the upper case 16.

  When assembling the electrical junction box 10 having the structure as described above, as shown in FIGS. 1 and 3 to 4, first, a printed circuit board is formed on the bottom wall 18 surrounded by the peripheral wall 20 of the lower case 12. 14 is mounted, and the printed circuit board 14 is fixedly held to the lower case 12 by a fixing means (not shown) such as a press-fitting rib. Next, the upper case 16 is moved closer to the lower case 12 that holds the printed circuit board 14 in a state where the opening of the upper case 16 is directed downward from above. Here, the peripheral wall portion 56 of the upper case 16 is provided with a notch-shaped side opening 58 that opens to the lower case 12 side in order to expose the fuse module 28 to the outside. Therefore, a pair of divided peripheral walls located at both ends in the width direction of the side surface opening 58 due to a difference in rigidity between the distal end side (lower side in FIG. 4) and the proximal end side (upper side in FIG. 4) of the peripheral wall portion 56. The tip portions 66 and 66 of the portions 60 and 60 are likely to be displaced so as to fall inside the side opening 58. Even when such a displacement occurs, one of the tip portions 66 and 66 (right side in FIGS. 3 to 4) of the dividing peripheral wall portion 60 is formed on the protruding end surface 36 of the fixing cylinder portion 32. The other end (left side in FIGS. 3 to 4) of the front end portions 66 and 66 of the divided peripheral wall portion 60 is in contact with the tapered surface 52 formed on the protruding end surface 50 of the guide projection 48. As a result, the distal end portions 66 and 66 of the divided peripheral wall portion 60 are displaced outward along the tapered surfaces 38 and 52. That is, the inward displacement of the distal end portions 66 and 66 of the divided peripheral wall portion 60 is corrected by the tapered surfaces 38 and 52 provided on the fixing cylinder portion 32 and the guide projection 48. As described above, in this embodiment, the pair of displacement preventing portions for correcting the inward displacement of the divided peripheral wall portion 60 includes the fixing cylinder portion 32, the guide protrusion 48, and the protruding end surface of the fixing cylinder portion 32. 36 and the tapered surface 52 formed on the protruding end surface 50 of the guide protrusion 48 are arranged on the lower case 12 side.

  Finally, the lock portions 64 provided at the four corners of the peripheral wall portion 56 of the upper case 16 are engaged with the locked portions (not shown) provided at the four corners of the lower case 12 so that the printed circuit board 14 is fixedly held. 12, the upper case 16 is held in an assembled state. In this assembled state, the fuse module 28 is exposed to the outside from the side opening 58 and the connector mounting portion 40 is exposed to the outside from the notch 62.

  According to the electrical junction box 10 of this embodiment having such a structure, the distal end portions 66 and 66 on the lower case 12 side of the divided peripheral wall portion 60 of the upper case 16 are displaced toward the inner side of the side opening 58. Even if the assembling operation is performed as usual, the tip portions 66 and 66 on the lower case 12 side are respectively formed into the tapered surface 38 formed on the protruding end surface 36 of the fixing cylinder portion 32 and the protruding end surface of the guide protrusion 48. By abutting against the tapered surface 52 formed in 50, it is displaced outward along the tapered surfaces 38 and 52. That is, in the present embodiment, a pair of displacement prevention portions that correct the inward displacement of the divided peripheral wall portion 60 are formed on the fixing cylinder portion 32 and the guide protrusion 48 and the protruding end surface 36 of the fixing cylinder portion 32. The tapered surface 38 and the tapered surface 52 formed on the protruding end surface 50 of the guide projection 48 are included. Therefore, the lower case 12 and the upper case 16 can be reliably and simply assembled in a normal state.

  In addition, one of the displacement preventing portions is used as a peripheral edge of the protruding end surface 36 of the fixing cylinder portion 32 by using the existing fixing cylinder portion 32 provided on the side edge portion of the fuse module 28 mounted on the printed circuit board 14. The taper surface 38 can be easily formed simply by providing the portion with the tapered surface 38 inclined obliquely outwardly with respect to the width direction of the side opening 58. Therefore, the displacement preventing portion can be provided simply and at low cost without increasing the number of parts. Further, a guide projection 48 is integrally provided on the peripheral wall portion 46 by using the connector mounting portion 40 disposed in the vicinity of the fuse module 28 on the other side of the displacement prevention portion, and the protruding end surface 50 of the guide projection 48 is provided. It is possible to simply form the taper surface 52 that is provided at the peripheral edge portion and is inclined obliquely outwardly with respect to the width direction of the side opening 58. Also in this case, since it can be formed simply by changing the shape of the existing connector mounting portion 40, the displacement preventing portion can be provided simply and at low cost without increasing the number of components.

  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-described embodiment, the pair of displacement prevention portions are respectively formed on the fixing cylinder portion 32 and the guide protrusion 48, but the pair of displacement prevention portions are divided inwardly on the lower case 12 side. What is necessary is just to be comprised in the site | part which the front-end | tip parts 66 and 66 by the side of the lower case 12 in the surrounding wall part 60 contact | abut, respectively, and to correct the inward displacement of the division | segmentation surrounding wall part 60. Therefore, it is not essential to be provided on the fuse module 28 mounted on the printed circuit board 14 as illustrated, or other members formed in the vicinity thereof. For example, the fuse module 28 can be protruded from the lower case 12. In the above-described embodiment, the upper case 16 is attached after the printed board 14 is attached to the lower case 12. However, the lower case 12 may be attached after the upper case 16 and the printed board 14 are attached. In addition, any known circuit board such as the printed board 14 or the bus bar circuit body can be used as the circuit board.

12: Lower case (first case), 14: Printed circuit board (circuit board), 16: Upper case (second case), 28: Fuse module (side part connecting part), 32: Cylinder part for fixing (displacement) Prevention part), 36: protrusion end surface, 38: taper surface (displacement prevention part), 40: connector mounting part (other parts), 46: peripheral wall part, 48: guide protrusion (displacement prevention part), 50: protrusion end face, 52 : Tapered surface (displacement preventing portion), 56, 56a: peripheral wall portion, 58: side opening, 60: divided peripheral wall portion, 66: tip portion

Claims (3)

A first case for holding a circuit board on which a side component connecting portion is mounted;
A second case which is assembled to the first case and constitutes a housing space for housing the circuit board between the first case,
The peripheral wall portion of the second case is provided with a notch-shaped side surface opening that opens to the first case side, and both end sides of the side surface opening portion are divided peripheral wall portions. In the electrical junction box where the side part connection part is exposed to the outside,
A pair of displacement prevention portions are provided on the first case side, and when the distal end portion of the divided peripheral wall portion of the second case is displaced inward of the side surface opening portion, The distal end part abuts on the displacement preventing part, and the inward displacement of the divided peripheral wall part is corrected ,
At least one of the pair of displacement prevention portions is provided on a fixing cylinder portion to the circuit board protruding from a side edge portion of the side part connecting portion, and provided on a protruding end surface of the fixing cylinder portion. An electrical junction box , comprising: a tapered surface that is inclined obliquely outwardly with respect to the width direction of the side opening . A first case for holding a circuit board on which a side component connecting portion is mounted;
A second case which is assembled to the first case and constitutes a housing space for housing the circuit board between the first case,
The peripheral wall portion of the second case is provided with a notch-shaped side surface opening that opens to the first case side, and both end sides of the side surface opening portion are divided peripheral wall portions. In the electrical junction box where the side part connection part is exposed to the outside,
A pair of displacement prevention portions are provided on the first case side, and when the distal end portion of the divided peripheral wall portion of the second case is displaced inward of the side surface opening portion, The distal end part abuts on the displacement preventing part, and the inward displacement of the divided peripheral wall part is corrected,
At least one of the pair of displacement preventing portions is provided on a protruding protrusion of the guide protrusion, which is integrally provided on a peripheral wall portion of another component disposed in the vicinity of the side component connecting portion. electrical connection box, characterized in that it is configured to include a tapered surface inclined downward obliquely outwards with respect to the width direction of the side opening Te. At least one of the pair of displacement preventing portions is provided on a protruding protrusion of the guide protrusion, which is integrally provided on a peripheral wall portion of another component disposed in the vicinity of the side component connecting portion. The electrical connection box according to claim 1, further comprising a tapered surface inclined obliquely outward with respect to the width direction of the side opening.

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