JP2006034010A - Electric connection box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric connection box in which heat generated from a power circuit section can be prevented from having an effect on a control circuit. <P>SOLUTION: In the electric connection box, a circuit component 10 contained in a casing 20 comprises a power circuit section 18 constituting a power circuit by arranging bus bar groups 11A, 11B and 11C, and a control circuit board 40 located at a position spaced apart from the power circuit section 18 and provided with a control element 41 for constituting a control circuit wherein a partition wall 29 for sectioning the inside of the casing 20 is formed between the power circuit section 18 and the control circuit board 40. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrical junction box.

  2. Description of the Related Art Conventionally, for example, an electrical junction box for distributing current from a battery or the like to various parts in a vehicle is known.

In this type of electrical junction box, a board on which elements are mounted is provided, and the circuit on this board and the bus bar are electrically connected to form a power circuit unit, and the same board. In some cases, a control circuit for controlling current distribution by the power circuit unit is configured.
JP 2002-330524 A

By the way, the power circuit described above generates heat from elements (relays, etc.) because a relatively large current flows. On the other hand, elements (ICs, etc.) on the control circuit are easily affected by heat, and the influence of heat generated in the power circuit. Is easy to reach the control circuit.
This invention is completed based on the above situations, Comprising: It aims at providing the electrical junction box which can prevent the influence of the heat which generate | occur | produced from the electric power circuit part reaching a control circuit.

  As a means for achieving the above object, the invention of claim 1 is an electric junction box in which a circuit component is housed in a casing, and the circuit component is a power circuit in which a bus bar is routed. And a control circuit board that is arranged at a position separated from the power circuit part and includes a control element to constitute a control circuit, the power circuit part and the control circuit board It is characterized in that a partition wall for partitioning the inside of the casing is formed.

  According to a second aspect of the present invention, in the first aspect of the present invention, the casing includes a main body portion that is open on one side and a lid portion that closes the main body portion, and the partition wall is formed on the lid portion. It has the characteristics in the place.

  A third aspect of the invention is characterized in that, in the second aspect of the invention, the partition wall is also formed in the main body portion.

<Invention of Claim 1>
According to this configuration, since the partition wall that partitions the inside of the casing is formed between the power circuit unit and the control circuit board, it is difficult for heat to be transmitted from the power circuit unit to the control circuit board.

<Invention of Claim 2>
According to this structure, the partition wall which divides the inside of a casing can be formed by simple operation of closing the opening of a main-body part with a cover part.

<Invention of Claim 3>
According to this configuration, since the partition wall is formed not only in the lid portion but also in the main body portion, heat from the power circuit portion is further less likely to be transmitted to the control circuit board.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the electrical junction box of the present embodiment has a circuit structure 10 housed in a casing 20 and is mounted on a vehicle (not shown), and current from a vehicle power source (battery or the like) is supplied to the vehicle. It is for distributing to each device.

  As shown in FIG. 2, the circuit structure 10 is arranged at a position away from the power circuit unit 18, which forms a power circuit by passing a current supplied from a power source (battery or the like). It is comprised from the control circuit board 40 which comprises a control circuit, and the flexible flat conductor 50 which electrically connects the said control circuit and a power circuit.

  The power circuit unit 18 includes a rectangular wiring board 25 in which the bus bars 11 are stacked via the insulating plate 12, and a cover 30A that covers the wiring board 25 from above.

  As shown in FIG. 3, the wiring board 25 includes a plurality of bus bar groups 11A, 11B, and 11C that are made of metal and formed in a flat plate shape, and are laminated in three layers via two insulating plates 12A and 12B. The bus bar groups 11A, 11B, 11C of each layer constitute a conductive path, and a terminal portion 13 is formed upright for each conductive path at the end of each conductive path.

  Further, at one end (the left end in FIG. 2) of the wiring board 25, control circuit side terminal portions 16A, 16B, and 16C extending from the bus bar groups 11A, 11B, and 11C for each group are formed to protrude sideways. The control circuit side terminal portions 16A, 16B and 16C are connected to one end side of a flexible flat conductor 50 which will be described later. The control circuit side terminal portions 16A, 16B, and 16C are set to be bent so that the height of the upper surface thereof is horizontal, and the flexible flat conductor 50 is connected to the horizontal upper surface. It has become.

  The cover portion 30A is engaged with the receiving portion 30B inside the main body portion 20B, which will be described later, in a state where the wiring board 25 is received, whereby the claw portion 31A of the cover portion 30A and the engaging portion 31B of the receiving portion 30B are engaged. Thus, the fitted state is maintained.

  As shown in FIG. 2, a plurality of relay insertion ports 32 that open in a hood shape are provided on the upper surface of the cover portion 30 </ b> A, and a plurality of fuse insertion ports 33 that also open in a hood shape are provided. When the cover portion 30 </ b> A is fitted, the terminal portion 13 protrudes inside the hood of the relay insertion port 32 and the fuse insertion port 33. In addition, electronic components such as an external relay 34 and a fuse 35 are attached to the insertion ports 32 and 33.

  The control circuit board 40 has a printed wiring on a rectangular board, and a control circuit 41 (for example, a microcomputer, a relay, etc.) is mounted on one surface (the upper surface in FIG. 2) to form a control circuit. Yes.

  As shown in FIG. 3, three electrical connection portions 42, 42, 42 respectively connected to the above-described printed wirings are provided side by side in a substantially central portion on one long side portion of the control circuit board 40. Here, a flexible flat conductor 50 is connected thereto.

  As shown in FIG. 3, the flexible flat conductor 50 has three conductive portions 51 on one surface (upper surface in FIG. 3) of a thin and substantially rectangular insulating member (for example, a synthetic resin such as plastic or rubber). , 51, 51 are arranged side by side, and the interval between the conductive portions 51, 51, 51 is narrowed toward the control circuit board 40. Then, one end side of the conductive portions 51, 51, 51 is soldered (electrically connected) to the control circuit side terminal portions 16 A, 16 B, 16 C of the bus bar 11, and the other end side is electrically connected to the control circuit board 40. The parts 42, 42, 42 are respectively soldered (electrically connected).

  The casing 20 is made of, for example, a synthetic resin, and includes a main body portion 20B that is open on one surface and a lid portion 20A that closes the main body portion 20B.

  The main body portion 20 </ b> B includes a rectangular bottom plate 21 and side walls 22 that stand from the peripheral edge of the bottom plate 21.

  On the upper surface of the bottom plate 21, a support wall 23 erected on one end side in the longitudinal direction (left end side in FIG. 1) and a housing portion 30 </ b> B that occupies substantially the entire central portion of the upper surface of the bottom plate 21 are formed. ing.

  The support wall 23 has a thick and rectangular flat plate shape, and a pair of screw holes 23A are formed at both ends (the front and rear ends in FIG. 2).

  The accommodating portion 30B is provided with a wall portion 39, and an engaging portion 31B is formed on the upper edge portion of the wall portion 39 at a position corresponding to the claw portion 31A of the cover portion 30A.

  A plurality of locking portions 24B are provided on the upper edge portion of the side wall 22. When the cases 20A and 20B are fitted, the locking portions 24B and claw pieces 24A provided on the surrounding wall 26 of the lid portion 20A The engagement state of both cases 20A and 20B is maintained by engaging.

  The circuit component 10 is fixed on the bottom plate 21 of the main body 20B, and the back surface of the control circuit board 40 (the surface on which the control element is not mounted) is bent on the support wall 23 while bending the flexible flat conductor 50. The control circuit board 40 is fixed to the support wall 23 by fixing the screw 28 to the screw hole 23A of the support wall 23 in accordance with one surface (the right side surface in FIG. 1).

  The lid portion 20 </ b> A includes a rectangular top plate 27 and a surrounding wall 26 that protrudes downward from the periphery of the top plate 27.

  On the top plate 27, a partition wall 29 is formed across the front and rear of the top plate 27 so as to protrude downward slightly on one side end side (left end side in FIG. 1).

  More specifically, the position of the partition wall 29 is such that the control circuit side terminal portions 16A, 16B, and 16C of the bus bar 11 are closed when the lid portion 20A is closed with the circuit component 10 fixed on the main body portion 20B. It is formed so as to be arranged upward. Further, the protruding height is a height that covers (covers) almost the entire element 41 above the element 41 on the control circuit board 40 (to the right in FIG. 1) (slightly lower than the lower end of the control circuit board 40 in FIG. 1). It is said that it is the length up to the top). The partition wall 29 is formed integrally with the lid 20A, but may be configured such that only the partition wall 29 can be removed.

  On the outer surface of the surrounding wall 26, a claw piece 24A protruding downward is provided at a position corresponding to the engaging portion 31B of the main body portion 20B.

  According to the present embodiment, since the control circuit board 40 is arranged at a position separated from the power circuit unit 18, the power circuit and the control circuit can be separated, and the influence of heat generated in the power circuit unit 18 is affected. It is difficult to exert on the control circuit. Further, since a partition wall 29 that partitions the inside of the casing 20 is formed between the power circuit unit 18 (relay 34, etc.) and the control circuit board 40, heat from the power circuit unit 18 (relay 34, etc.) is formed. Is not easily transmitted to the control circuit board 40 by being blocked by the partition wall 29. Furthermore, the inside of the casing 20 can be partitioned by the partition wall 29 by a simple operation of closing the opening of the main body 20B with the lid 20A.

  Further, in the present embodiment, by forming the partition wall 29 in the lid portion 20A, the space on the upper side in the casing 20 where heat is more likely to accumulate is partitioned, thereby controlling the heat on the power circuit portion 18 side. Since it is difficult to move to the circuit board 40 side, an excellent heat shielding effect can be exhibited. Furthermore, since it takes time for the heat to move as much as there is a partition wall 29, heat should be released during that time.

  In addition, in order to enhance the heat shielding effect, when the material of the lid portion 20A has a high heat dissipation property (for example, aluminum) or when the electrical junction box is applied to a place where waterproofing is not required. It is conceivable to provide an opening in the casing 20 (lid portion 20A), or to attach a heat radiating sheet or to form heat radiating fins. On the other hand, for the partition wall 29, in order to enhance the heat shielding effect, measures such as increasing the thickness of the wall or changing to a material having low heat conductivity can be considered.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG.
The casing 20 of the first embodiment is configured such that the partition wall 29 is formed only on the lid portion 20A. However, in the second embodiment, as illustrated in FIG. 4, the partition wall 60 is further formed on the main body portion 20B. It is what. About the same structure as Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted and only a different part is demonstrated.

  A partition wall 60 is erected at a position corresponding to the partition wall 29 of the lid portion 20A in the main body portion 20B, and when the main body portion 20B and the lid portion 20A are fitted, these partition walls 29, 60 sandwiches the flexible flat conductor 50 almost in the middle of the casing 20 in the height direction with almost no gap. In the present embodiment, the control circuit board 40 is fixed on the support base 61 in a horizontal posture. Further, the lid portion 20A is not limited to being fitted from above, and for example, the partition walls 29 and 60 may be configured to sandwich the cable by sliding from the side.

  Thus, the power circuit unit 18 and the control circuit board 40 are partitioned in a substantially sealed state, and heat is more difficult to be transmitted from the power circuit unit 18 to the control circuit board 40. Also in this embodiment, as a device for improving the heat shielding properties of the partition walls 29, 60, for example, recesses (not shown) are formed on the opposing end surfaces of the partition wall 29 side and the partition wall 60 side, respectively. When the wall 29 and the partition wall 60 are abutted against each other, an air chamber that is substantially closed by both concave portions may be formed, whereby the both partition walls 29 and 60 may be configured as heat insulating walls.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG.
In the second embodiment, the partition wall 29 of the lid portion 20A has only one place. However, in the third embodiment, as shown in FIG. 5, the two partition walls 71 and 72 are spaced apart from the lid portion 20A by a predetermined distance. Open and projecting downward. The protruding heights of the partition walls 71 and 72 are both set to a height that reaches a substantially central portion of the casing 20, and the partition wall 60 of the main body 20 </ b> B is located at a position corresponding to approximately the middle of the partition walls 71 and 72. Thus, the power circuit unit 18 and the control circuit board 40 are connected in a state where the flexible flat conductor 50 bypasses the partition wall 60.

  Accordingly, the heat generated in the power circuit unit 18 is not easily transmitted to the control circuit board 40 by the partition walls 60, 71, 72.

<Embodiment 4>
Next, Embodiment 4 of the present invention will be described with reference to FIG.
In the fourth embodiment, a main body portion 80B that is vertically longer than the main body portion 20B of the above-described embodiment is formed with the opening side facing downward, and a partition wall 81 that is substantially the same height as the main body portion 80B is formed. ing. In the above embodiment, the long side of the control circuit board 40 is connected to the flexible flat conductor 50. However, in this embodiment, the short side of the control circuit board 40 is connected to the flexible flat conductor 50.

  Then, the power circuit unit 18 and the control circuit board 40 are both vertically placed in two spaces partitioned by the partition wall 81 in a direction opposite to each other, and the power circuit unit 18 and the control circuit board 40 are supported by the support 82. The lid 80A is fitted from below after being fixed to the support wall 83. At this time, the flexible flat conductor 50 is bent under the partition wall 81.

  Thereby, the heat generated in the power circuit unit 18 is blocked by the partition wall 81 and is not easily transmitted to the control circuit board 40. The electric junction box can be downsized in the width direction, and the electric junction box can be arranged even in a place where a sufficient space in the width direction cannot be obtained.

<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, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

(1) The number of the partition walls formed in the lid portion 20A and the main body portion 20B is not limited to the number in the above embodiment. For example, three or more partition walls may be formed on the lid portion 20A, and two or more partition walls may be formed on the main body portion 20B.
(2) Although the control circuit board 40 and the power circuit unit 18 are electrically connected by the flexible flat conductor 50 in the above embodiment, the present invention is not limited to this. For example, the control circuit board 40 and the power circuit unit 18 may be electrically connected by another conductive member. Further, the control circuit board 40 and the power circuit unit 18 may not be related in terms of circuits, and each circuit may perform an independent operation. Furthermore, the control circuit board 40 and the power circuit unit 18 may be configured not to be electrically connected.

Sectional conceptual diagram of the electrical junction box showing the configuration of the first embodiment Disassembled perspective view of electrical junction box The perspective view which shows the connection state of a flexible flat conductor Sectional conceptual diagram of the electrical junction box showing the configuration of the second embodiment Sectional conceptual diagram of the electrical junction box showing the configuration of the third embodiment Sectional conceptual diagram of the electrical junction box showing the configuration of the fourth embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Circuit structure 11A, 11B, 11C ... Bus-bar group 12A, 12B ... Insulation board 16A, 16B, 16C ... Control circuit side terminal part 18 ... Power circuit part 20 ... Casing 20A ... Lid part 20B ... Main-body part 23 ... Support wall 25 ... Wiring board 27 ... Top plate 29, 60, 71, 72, 81 ... Partition wall 30A ... Cover part 40 ... Control circuit board 50 ... Flexible flat conductor

Claims (3)

An electrical junction box in which a circuit component is housed in a casing,
The circuit structure is
A power circuit section in which a bus bar is wired to form a power circuit;
A control circuit board that is arranged at a position spaced apart from the power circuit unit and that includes a control element to form a control circuit;
A partition wall for partitioning the inside of the casing is formed between the power circuit unit and the control circuit board. The casing is
It consists of a main body that opens on one side and a lid that closes the main body.
The electrical junction box according to claim 1, wherein the partition wall is formed on the lid. The electrical junction box according to claim 2, wherein the partition wall is also formed in the main body portion.

Images