JP3587084B2 - Distribution box - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a distribution box used for, for example, an automobile.
[0002]
[Prior art]
Conventionally, this type of distribution box has been mainly disposed in a vehicle compartment. The distribution box includes an electric connection box and an electronic unit. The electric junction box includes a laminate housing case, in which a laminate in which bus bars and insulating plates are alternately stacked is housed. Further, the electronic unit has a wiring board housing case including a lower case and an upper case. A printed wiring board on which electronic components are mounted is housed inside the wiring board housing case. Then, the stacked body housing case and the wiring board housing case are joined by tightening a screw.
[0003]
[Problems to be solved by the invention]
However, in the conventional power distribution box, since the wiring board housing case is composed of two cases, the number of components is increased and the cost is increased. Therefore, in order to solve this problem, it is conceivable to omit the lower case constituting the wiring board housing case. However, when this configuration is adopted, water due to dew condensation on the air conditioner piping or the like may enter the inside through the lower opening formed in the upper case, and thus has a problem of adversely affecting the printed wiring board. If the lower case is omitted, there is no support for the printed wiring board. For this reason, there is a problem that rattling occurs on the printed wiring board.
[0004]
The present invention has been made in view of the above problems, and has as its object to maintain the waterproofness of a wiring board housing case and to prevent rattling of a wiring board provided in the wiring board housing case. It is in.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, in the invention according to claim 1, a laminate housing case in which a laminate in which bus bars and insulating plates are alternately stacked is housed, and a wiring board housing case having an opening in a lower surface is provided. A stacking case, wherein the stacked body housing case includes a lower case and an upper case for closing an upper opening formed in the lower case, and the stacked body housing case is The lower case and the upper case sandwich the laminate, while the wiring board housing case is formed of a single member, and the upper surface of the upper case has an outer peripheral edge of the wiring board housing case. A wall protruding from the upper surface of the upper case is formed integrally with the upper case so as to surround the upper case, and a region inside the wall on the upper surface of the upper case is formed. A supporting portion for supporting the wiring board provided in the wiring board housing case is formed integrally with the upper case, and a screwing portion to which the fastening member is screwed is provided in the lower case. An upper end portion of the screw portion is inserted into an upper surface of the upper case, and a tubular portion on which the wiring board is supported protrudes , and the screw member is screwed in a state before the fastening member is tightened. The upper end surface of the portion is set at a position lower than the upper end surface of the tubular portion, and a space is formed by a lower surface of the wiring board, an inner surface of the tubular portion, and an upper end surface of the screw portion. Then, with the fastening of the fastening member, pressing the upper surface of the tubular portion with the lower surface of the wiring board to push down the upper case, and with the fastening, the screwing portion is pressed against the screwing portion. The lower case is pulled by the fastening member being screwed. The distance between the lower case and the upper case is shortened by an amount corresponding to the reduction of the space by both of the lower case and the upper case. The gist is that you did.
[0006]
In the invention described in claim 2, in the power distribution box of claim 1, before Symbol lower case, and summarized in that the laminate support portion for receiving the laminate digits set.
[0007]
According to a third aspect of the present invention, in the power distribution box according to the first or second aspect, a distance from an upper surface of the upper case to a distal end surface of the support portion, and the cylindrical portion from an upper surface of the upper case. The point is that the distance to the upper end surface is set to be the same .
[0008]
Hereinafter, the “action” of the present invention will be described.
According to the invention described in any one of claims 1 to 3 , since the wall is provided so as to surround the outer peripheral edge of the wiring board housing case, the lower opening formed in the wiring board housing case. Even if it is not closed, water or the like does not enter the wiring board housing case. In addition, since a member for closing the lower opening can be omitted, the number of components is reduced, and the assembly cost and the like can be reduced. Further, since the wiring board provided in the wiring board housing case is supported by the support portion, it is possible to prevent rattling of the wiring board.
[0009]
Further, when the fastening member is fastened to the screw portion, the wiring board is pressed against the tubular portion, and the laminate is sandwiched between the two cases. Therefore, it is possible to suppress rattling between the bus bars and the insulating plates that constitute the laminate.
[0010]
Further, before tightening the fastening member, the upper end surface of the screw portion is set at a position lower than the upper end surface of the tubular portion. For this reason, when the wiring board presses the cylindrical portion by the fastening of the fastening member, the distance between the upper case and the lower case decreases. Therefore, since the holding force of the laminate by the two cases is increased, it is possible to further suppress the play between the bus bar and the insulating plate.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied in a distribution box for a vehicle will be described in detail with reference to the drawings.
[0012]
As shown in FIGS. 1 and 2, the distribution box 11 mainly disposed in the vehicle compartment includes an electric connection box 12 and an electronic unit 13. The electric connection box 12 includes a laminate housing case 15 made of synthetic resin. The stacked body housing case 15 includes a lower case 16 and an upper case 17 detachably provided on an upper portion thereof. The upper opening 17a formed in the lower case 16 is covered by the upper case 17.
[0013]
The stacked body housing case 15 houses a stacked body 20 in which a plurality of bus bars 18 made of metal and a plurality of insulating plates 19 made of synthetic resin are alternately stacked. A plurality of connector joints 21 project from the lower surface of the lower case 16. The inner end of each connector joint 21 is set at the same height. The laminate 20 is supported on the inner end face of each connector joint 21.
[0014]
On the bottom surface of the lower case 16, a plurality (only one is shown in FIG. 2) of threaded portions 22 are protruded so as to penetrate the laminated body 20. The upper end of each screwing portion 22 is inserted into a cylindrical portion 23 formed on the upper surface of the upper case 17. The upper end surface of the screw portion 22 is set at a position lower than the upper end surface of the tubular portion 23. Specifically, the upper end surface of the screw portion 22 is lower than the upper end surface of the tubular portion 23 by about 2 to 3 mm. A step portion 22 a is formed at the center of the screw portion 22, and in addition to the connector joint portion 21, the stacked body 20 is also supported at the step portion 22 a. In the present embodiment, the connector support 21 and the step 22a constitute a laminate support.
[0015]
On the upper surface of the upper case 17, a rectangular frame-shaped wall portion 25 is provided. The wall portion 25 projects from the upper surface of the upper case 17 by a predetermined length. The wall portion 25 is made of a synthetic resin, and is formed integrally with the upper case 17. The outer periphery of the electronic unit 13 is surrounded by the wall 25. Thereby, the wall portion 25 and the side wall of the wiring board housing case 30 overlap.
[0016]
A plurality of support protrusions 26 are provided as support portions in a region inside the wall 25 on the upper surface of the upper case 17. Each support protrusion 26 receives a printed wiring board 32 described later. The distance from the upper surface of the upper case 17 to the distal end surface of each support protrusion 26, that is, the length of each support protrusion 26 is all the same. Each support protrusion 26 is made of a synthetic resin, and is formed integrally with the upper case 17 similarly to the wall portion 25.
[0017]
Next, the electronic unit 13 will be described.
Electronic unit 13 is provided with a wiring board housing case 30 having a lower opening. The storage case 30 is inserted and arranged in a region inside the wall 25. In other words, the outer peripheral edge of the wiring board accommodating case 30 is surrounded by the front Kikabe unit 25. When the wiring board housing case 30 is mounted, the height of the wall portion 25 is set to be substantially the same as the upper end surface of the case 30.
[0018]
The printed wiring board housing case 30 is provided with a printed wiring board 32 on which a plurality of electronic components 31 are mounted so as to cover the opening. The printed wiring board 32 is fixed to the wiring board housing case 30 by mounting screws (only FIG. 1 is shown) 33.
[0019]
A plurality of screw insertion holes 35 are formed in the wiring board housing case 30, and screws 34 as fastening members are inserted into the respective screw insertion holes 35. The tip of the screw 34 penetrates the printed wiring board 32 and is screwed to the screwing portion 22. Thus, the laminate housing case 15 and the wiring board housing case 30 are connected. In other words, the electric connection box 12 and the electronic unit 13 are connected. Then, by further tightening the screw 34, the upper case 17 is pressed against the upper surface of the laminate 20. Note that, in the present embodiment, the pressing means includes the screwed portion 22, the cylindrical portion 23, the screw 34, and the like.
[0020]
Next, the operation of the distribution box 11 configured as described above will be described.
To connect the electrical junction box 12 and the electronic unit 13, first, the wiring board housing case 30 is inserted into a region inside the wall 25. Next, a screw 34 is inserted into each screw insertion hole 35, and the screw 34 is fastened to the screwing portion 22. Further, the printed wiring board 32 presses each of the tubular portions 23 and each of the support protrusions 26 by tightening the screws 34. With this pressing, the upper case 17 presses the upper surface of the stacked body 20. As a result, the laminate 20 is sandwiched between the connector joint 21 and the upper case 17. Therefore, rattling of the bus bar 18 and the insulating plate 19 constituting the laminate 20 is almost eliminated.
[0021]
Therefore, according to the present embodiment, the following effects can be obtained.
(1) A wall portion 25 is provided upright on the upper surface of the laminate housing case 15 along the outer peripheral edge of the wiring board housing case 30. Therefore, the inside of the lower opening or we wiring board accommodating case 30, the ingress of water due to dew condensation, such as air conditioning pipes can be prevented. Therefore, there is no need to provide a member for closing the lower opening and to seal the printed wiring board 32 and the electronic components 31 inside the wiring board housing case 30. As a result, although the configuration of the wiring board housing case 30 is simplified, the waterproofness of the wiring board housing case 30 can be maintained at low cost, and the size can be reduced. Further, when the wiring board housing case 30 is assembled, the wall portion 25 and the side wall of the wiring board housing case 30 overlap each other. Therefore, the waterproofness of the wiring board housing case 30 can be reliably maintained.
[0022]
(2) A support projection 26 for supporting the printed wiring board 32 is provided in a protruding manner in a region inside the wall portion 25 on the upper surface of the laminate housing case 15. Therefore, the printed wiring board 32 can be pressed and supported on the support protrusions 26 by tightening the screws 34. Therefore, rattling of the printed wiring board 32 can be prevented.
[0023]
(3) The stacked body 20 accommodated in the lower case 16 is supported by the connector 22 and the step 22 a formed in the screwing portion 22. On the upper surface of the upper case 17, a cylindrical portion 23 into which the upper end portion of the screwing portion 22 is inserted and a printed wiring board 32 is supported is protruded. For this reason, when the screw 34 is fastened to the threaded portion 22, the laminate 20 can be sandwiched between the two cases 16, 17. Therefore, the play of the bus bar 18 and the insulating plate 19 constituting the stacked body 20 can be suppressed.
[0024]
(4) Before the screw 34 is tightened, the upper end surface of the screwing portion 22 is set at a position lower than the upper end surface of the tubular portion 23. For this reason, the distance between the upper case 17 and the connector connection portion 21 is shortened by the printed wiring board 32 pressing the tubular portion 23 by tightening the screw 34. Therefore, the holding force of the laminate by the two cases 16 and 17 can be increased, and the backlash of the bus bar 18 and the insulating plate 19 can be further suppressed.
[0025]
(5) The connector joint 21 also serves to support the laminate 20. Therefore, there is no need to provide a dedicated member separately from the connector joint 21 in order to support the laminate 20. For this reason, not only can the structure inside the laminate housing case 15 be simplified, but also the number of components can be reduced. Therefore, the manufacturing cost of the laminate housing case 15 can be reduced.
[0026]
Note that the embodiment of the present invention may be modified as follows.
In the above embodiment, the wall portion 25 is formed along the outer peripheral edge of the wiring board housing case 30. Alternatively, the wall 25 may be provided inside the wiring board housing case 30, and the wall 25 may be formed along the inner peripheral edge of the wiring board housing case 30.
[0027]
In the above embodiment, the stacked body housing case 15 and the wiring board housing case 30 are connected by the screws 34. Alternatively, one of the two cases 15 and 30 may be provided with an engagement claw, and the other may be provided with an engaged claw that is disengaged from the engagement claw. With this configuration, the laminate housing case 15 and the wiring board housing case 30 can be easily coupled.
[0028]
-In the said embodiment, the height of the upper end of the wall part 25 was set as the substantially same height as the upper end surface of the wiring-board housing case 30. Alternatively, the height of the upper end surface of the wall portion 25 may be set to be higher than the upper end surface of the wiring board housing case 30. With this configuration, the waterproofness of the wiring board housing case 30 can be further enhanced.
[0029]
A plurality of support protrusions 26 may be evenly arranged in a region inside the wall 25 on the upper surface of the upper case 17. With this configuration, the rattling of the printed wiring board 32 can be further suppressed.
[0030]
Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the above-described embodiments are listed below together with their effects.
(1) According to claim 1, the laminate housing case includes a lower case and an upper case for closing an upper opening formed in the lower case, and the upper case is attached to the laminate by tightening the fastening means. A power distribution box in which pressing means for pressing the upper surface is provided on the upper surface of the upper case. According to this configuration, the rattling of the laminate can be suppressed.
[0031]
(2) The power distribution box according to any one of (2) and (3), wherein the wall is integrally formed on an upper surface of the upper case. According to this configuration, it is not necessary to attach the wall portion of the separate member to the upper case, so that the manufacture becomes easy.
[0032]
(3) The power distribution box according to any one of (1) and (2), wherein the wall is provided outside the wiring board housing case. According to this configuration, the internal space of the storage case can be widened.
[0033]
(4) The distribution box according to any one of claims 1 to 3 and (1) to (3), wherein an upper end of the wall is higher than an opening of the wiring board housing case. According to this configuration, the waterproof property of the wiring board housing case can be improved.
[0034]
(5) The distribution box according to any one of (2) to (3) and (1) to (4), wherein the screw portion penetrates the laminate. According to this configuration, it is possible to prevent the bus bars and the insulating plates constituting the stacked body from being displaced from each other.
[0035]
【The invention's effect】
As described in detail above, according to the invention described in any one of claims 1 to 3, despite the simplification of the configuration of the wiring board housing case, the waterproofness of the wiring board housing case is improved. Can be held. At the same time, rattling of the wiring board provided in the wiring board housing case can be prevented.
[0036]
In addition, it is possible to suppress rattling of the bus bar and the insulating plate constituting the laminate.
Further, since the holding force of the laminate by the two cases is enhanced, the backlash of the bus bar and the insulating plate can be further suppressed.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a distribution box according to an embodiment.
FIG. 2 is a sectional view of a distribution box.
[Explanation of symbols]
11 distribution box, 15 laminate housing case, 16 lower case, 16a upper opening, 17 upper case, 18 busbar, 19 insulating plate, 20 laminate, 21 connector connector (laminate support) ), 22: screwed portion, 22a: step portion (laminated body support portion), 23: cylindrical portion, 25: wall portion, 26: support projection (support portion), 30: wiring board housing case , 31 ... electronic components, 32 ... printed circuit board (wiring board), 34 ... screw (fastening member).

Claims (3)

A power distribution box in which a stacked body housing case in which a stacked body in which a bus bar and an insulating plate are alternately stacked are housed, and a wiring board housing case having an opening on a lower surface are connected by a fastening member,
The stacked body housing case includes a lower case and an upper case that closes an upper opening formed in the lower case, and the stacked body housing case sandwiches the stacked body between the lower case and the upper case. while it is intended to, the wiring board housing case is constituted by a single member,
On the upper surface of the upper case, a wall projecting from the upper surface of the upper case is formed integrally with the upper case so as to surround an outer peripheral edge of the wiring board housing case,
In a region inside the wall on the upper surface of the upper case, a supporting portion for supporting a wiring board provided in the wiring board housing case is formed integrally with the upper case,
Further, in the lower case, a screwing portion to which the fastening member is screwed is provided,
On the upper surface of the upper case, an upper end portion of the screwed portion is inserted, and a tubular portion on which the wiring board is supported is protruded ,
In a state before the fastening member is tightened, an upper end surface of the screw portion is set at a position lower than an upper end surface of the tubular portion, a lower surface of the wiring board, an inner surface of the tubular portion, and A space is formed by the three members on the upper end surface of the screw part,
With the fastening of the fastening member, the upper surface of the tubular portion is pressed by the lower surface of the wiring board to push down the upper case, and with the fastening, the fastening member with respect to the screwed portion. The distance between the lower case and the upper case is shortened by an amount corresponding to the space being reduced by both raising the lower case by being screwed, thereby stacking the lower case and the upper case. A power distribution box, characterized in that the body has a stronger holding force . Before SL The lower case, distribution box according to claim 1, characterized in that the stack support portion for receiving the laminate digits set. The distance from the upper surface of the upper case to the distal end surface of the support portion and the distance from the upper surface of the upper case to the upper end surface of the tubular portion are set to be the same. The distribution box according to claim 2.

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