JP5472724B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box.

  As an electrical junction box disposed in an engine room of an automobile, for example, the one described in Patent Document 1 is known. In this electrical junction box, the circuit board is held in a case while being held by a frame, and a connector can be attached to and detached from the case.

JP-A-2005-117878

  When assembling the electrical junction box having the above-described configuration, the circuit board is fixed to the frame (holding member) to be in a holding state, and then the frame is inserted into the case to attach the connector. When the frame is inserted into the case or when the connector is attached to the case, a load is applied to the case because the case is picked from the direction intersecting the frame insertion direction. Moreover, in the thing of the above structures, the connector once attached may be removed from a case, and in this case, a bigger load will be applied to a case than the time of connector attachment.

However, in a general electrical junction box, when the operation of inserting the frame into the case is completed, a part of the frame is supported by contacting the case, but many parts of the inner wall of the case are supported. Absent. In particular, in the middle of inserting the frame, most of the case is not supported by the frame. As described above, a load is applied to the case due to frame insertion work, connector attachment / detachment work, etc., and there is a concern that the case may be crushed and components (circuit boards, etc.) housed in the case cannot be protected. Is done.
The present invention has been completed based on the above circumstances, and an object thereof is to provide an electrical junction box that is not easily crushed.

The present invention includes a case provided with an opening, a circuit board on which a conductive path is formed, and a holding member that is inserted from the opening of the case and attached to the case while holding the circuit board. An electrical connection box in which a connector is detachable on the opening side of the case, and a rib projecting inwardly is formed on the inner wall of the case, and the holding member A support portion is provided for supporting the case by contacting a rib formed on the inner wall of the case when the case is attached to the case, and the support portion is a start of insertion of the holding member into the case. It is provided in the side .

  In the present invention, a rib projecting inwardly is formed on the inner wall of the case, and a support portion is provided that contacts and supports the inner wall of the case when the holding member is attached to the case. Therefore, even when a load is applied to the case when the holding member is inserted or when the connector is attached or detached, it is difficult to be crushed. As a result, according to the present invention, it is possible to provide an electrical junction box that is not easily crushed even when parts are assembled or a connector is attached or detached.

In the present invention, the support part, that provided in the insertion start end side to the case of the holding member. With such a configuration, a circuit board routing area can be secured .
The present invention may have the following configurations.

  The rib may be formed so that the protruding height is lower on the opening side of the case than on the back surface side of the case. Such a configuration is preferable because interference between the ribs and the parts provided on the holding member hardly occurs.

  The rib may be formed at a substantially center in a direction orthogonal to the insertion direction of the holding member. With such a configuration, the rib is formed in the portion that is most easily subjected to load and is easily crushed, so that the case can be reliably prevented from being crushed.

  According to the present invention, it is possible to provide an electrical junction box that is not easily crushed.

Top view of the electrical junction box of Embodiment 1 Sectional drawing in the AA line of FIG. Case perspective view Front view of the case The perspective view of the holding member seen from the front side Rear view of holding member The perspective view of the holding member seen from the back side

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. The electrical junction box 10 of this embodiment is disposed between a power source such as an in-vehicle battery and a load such as each electronic device, and is used as a power distributor that controls power supply to each electronic device.
In the following description, the lower side in FIG. 1 is the front, and the upper side in FIGS.
As shown in FIG. 1, the electrical junction box 10 of the present embodiment includes a case 11 and a holding member 20 attached to the case 11. The electrical connection box 10 has a mating connector (not shown) detachably attached to the lower end of the case 11 in FIG.

  As shown in FIGS. 1 and 3, the case 11 has a substantially rectangular parallelepiped shape. The case 11 has a flat shape in the direction from the lower side to the upper side in FIG. As shown in FIG. 3, the case 11 is formed with an opening 12 that opens to the front side in FIG.

  As shown in FIG. 3, three locking portions 13 for locking the holding member 20 are formed on the front end portion of the upper wall of the case 11 and the front end portion of the lower wall, respectively. The locking portion 13 includes two locking grooves 13A and 13A formed from the front end of the case 11 toward the rear, and a substantially rectangular locking hole formed between the two locking grooves 13A and 13A. 13B. The locking projections 21 and 21 of the holding member 20 can be fitted in the locking grooves 13A and 13A, and the locking piece 22 of the holding member 20 can be locked in the locking hole 13B.

On the inner wall surfaces of the left and right side walls shown in FIG. 3 of the case 11, guide convex portions 15 functioning as guides when the holding member 20 is inserted into the case 11 are formed from the front end of the case 11 toward the rear end.
Now, on the inner wall surfaces of the upper wall and the lower wall of the case 11, ribs 16 are formed so as to project inwardly and extend in a direction substantially parallel to the insertion direction of the holding member 20 (FIGS. 3 and 3). 4). Specifically, eight ribs 16 are provided at approximately the center in the width direction of the inner wall surfaces of the upper wall and the lower wall (a direction orthogonal to the insertion direction of the holding member 20). Of the eight ribs 16, the center two ribs 16 </ b> A (center rib 16 </ b> A) are set so that the protruding height is higher than the other six ribs 16 </ b> B. Three ribs 16B having a low protruding height provided on both sides of the central rib 16A are reinforcing ribs 16B that reinforce the central rib 16A.

  The protruding heights of the central rib 16A and the reinforcing rib 16B are set to a height at which interference with the components provided on the holding member 20 does not occur until the insertion of the holding member 20 into the case 11 is completed. The protruding height of the center rib 16A and the reinforcing rib 16B is formed so as to be lower on the opening 12 side of the case 11 than on the back surface 17 side of the case 11.

  As shown in FIG. 2, a holding member 20 holding two circuit boards 28 is inserted into the case 11 from the opening 12 and attached. On the upper and lower surfaces of the front end portion of the holding member 20, as shown in FIG. 5, two locking projections 21, 21 fitted into the locking grooves 13 </ b> A, 13 </ b> A formed in the case 11, and two locking projections A locking piece 22 having a trapezoidal shape in front view and formed between the portions 21 and 21 and locked in the locking hole 13B is provided.

  As shown in FIG. 5, the holding member 20 includes a connector portion 23 to which a mating connector provided on the front side in the drawing is attached and detached, and has a frame shape continuously provided on the back side of the connector portion 23 in FIG. 5. The circuit board 28 is held by the board holding part 27.

  The connector portion 23 includes a hood portion 24 that opens to the front. As shown in FIG. 2, the connector portion 23 has a back wall 26 at a position in front of the mating connector in the fitting direction (right direction in FIG. 2). Is formed. A plurality of terminal fittings 25 are arranged through the back wall 26. The terminal fitting 25 is formed by pressing a metal plate material into a predetermined shape. One end of the terminal fitting 25 (the end located on the left side in FIG. 2) is arranged so as to be located in the hood 24 and is electrically connected to the mating connector fitted in the hood 24. Connected.

  Further, the other end of the terminal fitting 25 extends through the back wall 26 in the right direction in FIG. 2, is then bent at a right angle toward the circuit board 28 side, and penetrates the circuit board 28. . The other end of the terminal fitting 25 is electrically connected to a conductive path formed on the circuit board 28 by a known method such as soldering.

  The terminal fittings 25 are arranged in two stages in the vertical direction in FIGS. 2 and 7 on the back wall 26 of the connector. Further, the terminal fittings 25 are arranged side by side in the direction from the left front side to the right back side in FIG. Further, as shown in FIG. 7, the terminal fitting 25 is arranged in the downward direction on the left front side in the figure, and is arranged in the upward direction on the right back side in the figure.

  The board holding unit 27 surrounds and holds the periphery of the circuit board 28. The two circuit boards 28 held by the board holding part 27 have a substantially rectangular shape, and as shown in FIG. 2, the case 11 has an outer wall surface located above and below the case 11 in FIG. 2. The plate surfaces are arranged in a substantially parallel posture. A predetermined conductive path (not shown) is formed on the surface of the circuit board 28 by a printed wiring technique, and electronic components (not shown) are mounted on the conductive path.

  A C-shaped support portion 29 in the top view is formed in the center of the rear end portion of the substrate holding portion 27 in the width direction. The support portion 29 has a function of supporting the case 11 by contacting the inner wall of the case 11 when the holding member 20 is attached in the case 11. A columnar support reinforcing portion 30 for reinforcing the support portion 29 is provided at a position adjacent to the support portion 29. The support portion 29 is provided on the right back side in FIG. 5 and on the left back side in FIG. 7, that is, on the insertion start end side of the holding member 20 into the case 11. In addition, as shown in FIG. 6, the support portion 29 is provided at a substantially center in the width direction of the holding member 20, that is, a substantially center in a direction orthogonal to the insertion direction of the holding member 20.

Next, the operation and effect of this embodiment will be described.
The holding member 20 that holds and holds the circuit board 28 is inserted into the opening 12 of the case 11. The holding member 20 inserted into the opening 12 of the case 11 is guided by the guide convex portion 15 formed on the side wall surface of the case 11 and smoothly enters the back surface 17 side of the case 11. When the holding member 20 is further advanced toward the back surface 17 side of the case 11, the locking protrusions 21 and 21 are fitted in the locking grooves 13 </ b> A and 13 </ b> A of the case 11, and the locking holes 13 </ b> B of the case 11 are locked. The piece 22 is locked. At this time, the support portion 29 of the holding member 20 contacts and supports the central rib 16 </ b> A on the inner wall surface of the case 11.

  In this embodiment, a rib 16 projecting inwardly is formed on the inner wall of the case 11, and the support member 20 abuts and supports the inner wall of the case 11 when the holding member 20 is attached to the case 11. Since the portion 29 is provided, even when a load is applied to the case 11 when the holding member 20 is inserted or when the connector is attached or detached, the case 29 is not easily crushed. As a result, according to the present embodiment, it is possible to provide the electrical junction box 10 that is not easily crushed even when the assembly of components or the attaching / detaching operation of a connector is performed.

  In particular, in the present embodiment, the rib 16 is formed at substantially the center in the direction orthogonal to the insertion direction of the holding member 20. Therefore, the rib 16 is formed at a portion that is most susceptible to load and is easily crushed. Crushing can be surely prevented.

In addition, according to the present embodiment, since the support portion 29 is provided on the insertion start end side of the holding member 20 into the case 11, it is possible to secure a routing area of the circuit board 28.
Further, the central rib 16A and the reinforcing rib 16B are formed on the rib 16 and the holding member 20 because the protruding height is lower on the opening 12 side of the case 11 than on the rear surface 17 side of the case 11. Interference with other parts is less likely to occur.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) Although the above embodiment has been described as including two circuit boards, the number of circuit boards may be one.
(2) In the above embodiment, the holding member is provided with one C-shaped support portion on the insertion start end side of the case, but two or more support portions may be provided. The shape of the support portion may be a columnar shape. As a reference example, the support portion may be located near the center of the holding member.
(3) In the above-described embodiment, the case in which the central two ribs and the three reinforcing ribs having a protruding height lower than the ribs are provided on the upper and lower inner wall surfaces of the case is not limited thereto. . Ribs may be provided only on either the upper or lower surface of the case, or the number of central ribs may be one, or three or more. Moreover, the thing which does not provide a reinforcing rib, or the thing which provided 1-2 or 4 or more reinforcing ribs may be used.
(4) In the above-described embodiment, the rib is formed so that the protruding height is lower on the opening side of the case than on the back surface side of the case. However, the protruding height of the rib is constant. It may be a thing.
(5) In the above embodiment, the case formed at the approximate center in the width direction of the case (substantially the center in the direction orthogonal to the direction in which the holding member is inserted) is shown, but is closer to the end than the center of the case. May be provided.

DESCRIPTION OF SYMBOLS 10 ... Electrical junction box 11 ... Case 12 ... Opening part 16 ... Rib 17 ... Back surface of (case) 20 ... Holding member 23 ... Connector part 26 Back wall 28 ... Circuit board 29 ... Support part

Claims (3)

And the opening portions are provided case and the circuit board conductive paths are formed, together with and a holding member attached to the case is inserted from an opening portion of the case while holding the circuit board, wherein On the opening side of the case is an electrical connection box in which a connector can be attached and detached,
A rib projecting inwardly is formed on the inner wall of the case, and
The holding member is provided with a support portion that supports the case by abutting against a rib formed on the inner wall of the case when being attached to the case .
The said connection part is provided in the insertion start end side to the said case of the said holding member, The electrical junction box characterized by the above-mentioned . The electrical connection box according to claim 1, wherein the rib is formed so that a protruding height is lower on an opening side of the case than on a rear surface side of the case . The electrical connection box according to claim 1 , wherein the rib is formed at a substantially center in a direction orthogonal to the insertion direction of the holding member .

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