JP2020127249A - Electric connection box - Google Patents

Abstract

To provide an electric connection box capable of suppressing temperature rise due to current supplying without changing conventional structure and assembly methods.SOLUTION: An electric connection box 1 comprises an insertion space part 2d provided in a housing 2 and communicating with the outside of the housing 2 through an opening 2b, a housing space part 2c for housing a bus bar 10 and communicating with the insertion space part 2d, and a heat dissipation member 8 having thermal conductivity and thermally connected to a wire 7 provided with a terminal in the housing space part 2c. The wire 7 provided with the terminal is inserted into the insertion space part 2d through the opening 2b and electrically connected with the bus bar 10 in the housing space part 2c. The heat dissipation member 8 projects from the housing space part 2c to the insertion space part 2d and extends toward the opening 2b.SELECTED DRAWING: Figure 4

Description

The present invention relates to an electric junction box.

Conventionally, an electrical connection box (also called a junction box, a fuse box, a relay box, etc.) that is mounted on a vehicle such as an automobile and collectively stores electronic components such as a wiring harness and a connection processing part and a fuse, a relay, etc. Are known.

In the above electric junction box, since the internal temperature rises due to the heat generated from the connection processing components and the contacts of the electronic components accommodated therein, various heat dissipation structures have been proposed to enhance the heat dissipation effect. For example, a radiator provided with a plurality of radiating fins is attached to the outer circumference of an electric wire protruding from the electrical junction box to the outside (see Patent Document 1). Further, there is one in which a heat conducting member made of a soft resin material having high heat conductivity and having a plurality of heat radiating portions radially extending at one end of a simple round bar is arranged from the inside of the housing to the outside (Patent Document 1). 2). There is also a heat pipe in which a working fluid is enclosed in a sealed tubular body is arranged from a heat collecting portion inside the housing to a heat radiating portion outside the housing (see Patent Document 3). Further, there is one in which an insulated wire is connected to the heat generating portion of the bus bar and the insulated wire is pulled out from the inside of the housing (see Patent Document 4).

JP, 10-42428, A JP, 2000-69643, A JP-A-10-285751 Japanese Utility Model Publication No. 3-91015

By the way, the conventional heat dissipation member is formed of a resin insulating material and is attached directly to an electric wire drawn from the inside of the housing to the outside, or is wound around an insulating tape together with the electric wire. Further, there is a busbar in which a holding portion for a heat radiation member is formed or a conductor of an electric wire is connected for heat radiation. Thus, there is room for improvement in terms of the degree of processing and ease of assembly.

An object of the present invention is to provide an electric junction box capable of suppressing a temperature rise due to energization without changing the conventional structure or assembly method.

In order to achieve the above-mentioned object, an electric connection box according to the present invention is provided with a casing that accommodates one or more electronic components, a conductive member that is electrically connected to at least the electronic components, and the casing. And an insertion space portion communicating with the outside of the housing through an opening, an accommodation space portion accommodating the conductive member and communicating with the insertion space portion, and the insertion space portion through the opening portion. An electric wire with a terminal that is electrically connected to the conductive member in the accommodation space through the housing and that supplies power to the electronic component from the outside of the housing via the conductive member, and has thermal conductivity. A heat dissipation member thermally connected to at least one of the electric wire with a terminal and the conductive member in the accommodation space, the heat dissipation member protruding from the accommodation space into the insertion space and into the opening. It is characterized by extending toward.

In the electric connection box, the heat dissipation member is thermally connected to at least one bent portion and the electric wire with a terminal, and is a thermal connection portion extending in an extending direction from the bent portion to the electric wire with a terminal. And an extending portion extending from the thermal connecting portion to a lower side in the up-and-down direction that intersects the extending direction via a bent portion, and the thermal connecting portion includes the terminal-attached electric wire. The terminal and the conductive member are fastened to a fastening member arranged in the accommodation space.

In the electric connection box, the heat dissipation member is thermally connected to at least one bent portion and the electric wire with a terminal, and is a thermal connection portion extending in an extending direction from the bent portion to the electric wire with a terminal. And an extending portion extending from the thermal connecting portion to a lower side in the up-down direction that intersects the extending direction via a bent portion, and the thermal connecting portion is provided in the accommodation space portion. In a fastening state in which the terminal of the electric wire with a terminal and the conductive member are fastened to the arranged fastening member, the locking piece is erected from the end of the conductive member electrically connected to the electric wire with a terminal. On the other hand, it is locked by a locking mechanism.

In the electric connection box, the heat dissipation member is a connection state in which the heat dissipation member is thermally connected to at least one of the electric wire with a terminal and the conductive member, and an end portion of the extending portion is below a terminal of the electric wire with a terminal. It is located between the end and the opening.

In the electric junction box, the housing has a side cover attached to an outer peripheral surface and extending toward a lower side, and a guide portion that guides the side cover from an upper side to a lower side. The insertion space portion is formed by the housing and the side cover, and the side cover has a holding portion that holds the heat dissipation member.

According to the electrical junction box of the present invention, it is possible to suppress an increase in temperature without changing the conventional structure or assembly method.

FIG. 1 is a perspective view showing a schematic configuration of an electrical junction box according to the first embodiment. FIG. 2 is a partially exploded perspective view showing a schematic configuration of the electrical junction box according to the first embodiment. FIG. 3 is a perspective view of a side cover that constitutes the electrical junction box according to the first embodiment. FIG. 4 is a perspective view showing a schematic configuration of a main part of the electrical junction box according to the first embodiment. FIG. 5 is a partial vertical cross-sectional view showing a schematic configuration of the electrical junction box according to the first embodiment. FIG. 6 is a partially exploded perspective view showing a schematic configuration of the electrical junction box according to the second embodiment. FIG. 7: is a perspective view which shows schematic structure of the principal part of the electrical junction box which concerns on 2nd Embodiment. FIG. 8 is a partial vertical cross-sectional view showing the schematic configuration of the electrical junction box according to the second embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below. In addition, constituent elements in the following embodiments include elements that can be easily replaced by those skilled in the art, or substantially the same elements.

[First Embodiment]
First, the electrical junction box according to the first embodiment will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective view showing a schematic configuration of an electrical junction box according to the first embodiment. FIG. 2 is a partially exploded perspective view showing a schematic configuration of the electrical junction box according to the first embodiment. FIG. 3 is a perspective view of a side cover that constitutes the electrical junction box according to the first embodiment. FIG. 4 is a perspective view showing a schematic configuration of a main part of the electrical junction box according to the first embodiment. FIG. 5 is a partial vertical cross-sectional view showing a schematic configuration of the electrical junction box according to the first embodiment. Note that FIG. 3 shows a state in which the heat dissipation member is assembled to the side cover. In FIG. 4, the case 2, the side cover 6, and the sub block are omitted.

Here, the X direction in FIGS. 1 to 5 (including FIGS. 6 to 8) is the depth direction of the electrical junction box in the embodiment. Particularly, the X1 direction is the back direction and the X2 direction is the front direction. The Y direction is the width direction of the electrical junction box in the embodiment, and is the direction orthogonal to the depth direction. The Z direction is the vertical direction of the electrical junction box in the embodiment, and is the direction orthogonal to the depth direction and the width direction. In particular, the Z1 direction is the downward direction, which is the side cover mounting direction. The Z2 direction is the upward direction and is the side cover removal direction.

The electric junction box 1 according to the first embodiment is mounted on, for example, a vehicle body of a vehicle such as an automobile, and various types of electric power supplied from a power source such as a battery is mounted on the vehicle body through various electronic components. It is to be distributed to electronic devices of. As shown in FIG. 1, the electrical junction box 1 is an assembly of electronic components 100 such as a connector, a fuse, a relay, a branch section, and an electronic control unit, which are incorporated in a wire harness WH and constitute a connection processing component such as an electric wire. To be housed inside. The electric junction box 1 is installed in a place exposed to an external environment such as an engine room of a vehicle body, and is connected between a power source such as a battery and various electronic devices mounted in the vehicle body. The electrical junction box 1 may also be called a junction box, a fuse box, a relay box, or the like, but in the following embodiments, these are generically referred to as an electrical junction box. The electrical junction box 1 includes a housing 2, a side cover 6, an electric wire 7 with a terminal, a heat dissipation member 8, and a bus bar 10.

The housing 2 houses one or more electronic components 100 and a bus bar 10 which is a kind of branching part in an internal space 2a formed inside. The housing 2 is formed of an insulating synthetic resin in a box shape, and includes a box body 3, an upper cover 4, and a lower cover 5. The housing 2 is formed by laminating the lower cover 5, the box body 3, and the upper cover 4 in this order from the lower side. The box body 3, the upper cover 4, and the lower cover 5 are each provided with a locking mechanism. By engaging the locking mechanisms with each other, the box body 3 and the upper cover 4 are locked, and the box body 3 and the lower cover 5 are locked, and a waterproof structure is formed. The housing 2 is attached to the vehicle body side with the stacking direction of the lower cover 5, the box body 3, and the upper cover 4 aligned with the vertical direction. In the housing 2 in the present embodiment, a vehicle body mounting portion provided outside the housing 2 is brought into contact with a vehicle body side, for example, a vehicle body side mounting panel or the like, and the vehicle body mounting portion and the vehicle body side are fastened with bolts or the like. Then, it is installed on the car body.

The box body 3 has a substantially rectangular outer peripheral shape when viewed from above in a state in which the electric junction box 1 is installed on the vehicle body side. The box body 3 has a lower opening at the lower end and an upper opening at the upper end. The box body 3 is formed in a hollow shape, and the lower opening and the upper opening communicate with each other in the vertical direction via the internal space 2a. The box body 3 has a peripheral wall 33 that forms a part of the internal space 2 a of the housing 2. The side cover 6 is attached to the outer peripheral surface 33 a of the peripheral wall 33 of the box body 3. The box body 3 has a housing space 2c as a part of the internal space 2a.

The accommodation space 2c is a space formed in the housing 2 adjacent to the insertion space 2d and communicating with the insertion space 2d. In the accommodation space 2c, a part of the peripheral wall 33 is cut out along the depth direction. The outer peripheral surface 33a of the peripheral wall 33 is formed at a position that is recessed toward the internal space 2a between the both end portions 33b that are notched in the peripheral wall 33 and face each other in the depth direction. A space between both ends 33b of the peripheral wall 33 is closed by a side cover 6 extending in the width direction and the vertical direction. The stud bolt S is arranged in the accommodation space 2c.

The insertion space portion 2d is a space portion provided in the housing 2 and communicating with the outside of the housing 2 through the opening 2b. The insertion space portion 2d is formed by the box body 3 and the side cover 6, as shown in FIGS. 2 and 5. The upper end and the lower end of the insertion space 2d are opened. The upper opening 32 is closed by the upper cover 4. The insertion space 2d communicates with the outside of the housing 2 through the opening 2b on the lower side. The opening 2b is a portion where the electric wire with a terminal 7 inserted through the insertion space 2d projects to the outside. The opening 2b has a larger opening area than the opening on the upper side because the insertion space 2d is formed along the inclination direction of the inclined wall 63 of the side cover 6. When the terminal 71 of the electric wire with terminal 7 is fastened to the stud bolt S with the nut N, the electric wire with terminal 7 is inserted into the insertion space 2d from the outside toward the accommodation space 2c through the opening 2b. It

Here, the stud bolt S is a fastening member, and the bus bar 10 protrudes from the space in which the electronic component 100 and the like are accommodated into the accommodation space 2c, and the electric wire with terminal 7 protrudes from the insertion space 2d into the accommodation space 2c. And are connected physically and electrically. For example, when electric power is supplied from the power source on the vehicle body side, the electric power is transferred at one place by the stud bolt S, and the electric power can be distributed and supplied to each electronic component 100 via the bus bar 10. The stud bolt S is attached to, for example, a mounting member for the stud bolt S that is connected to the inner peripheral surface of the peripheral wall 33, and is installed in the accommodation space 2c in an upright state. The stud bolt S of this embodiment is physically and thermally connected to the heat dissipation member 8. The stud bolt S has a thread groove formed on the outer periphery, and after inserting the bus bar 10, the electric wire with terminal 7 and the heat radiating member 8 into the stud bolt S in order, the nut N is inserted into the stud bolt S and screwed together. Conclude these.

The side cover 6 is attached to the outer peripheral surface 33a of the box body 3 and extends downward. The side cover 6 is attached so as to block between both end portions 33b of the peripheral wall 33 along the depth direction. When the side cover 6 is attached to the outer peripheral surface 33a, the inner side surface 61 located on the inner space 3a side opposes the outer peripheral surface 33a between the end portions 33b in the width direction. The side cover 6 is made of insulating synthetic resin. The side cover 6 is formed at both ends 33b of the peripheral wall 33 and is locked by a locking portion 34 for locking the side cover 6. The locking portion 34 is formed by a locking plate protruding from the outer peripheral surface 33a extending upward when viewed from the width direction and the depth direction. The side cover 6 in the state of being locked by the locking portion 34 is guided in the vertical direction by the guide portion 35 formed in the vertical direction of the peripheral wall 33 along the end portions facing in the width direction. Each guide portion 35 is formed so as to project from the outer peripheral surface 33a in the front direction. As shown in FIGS. 2 and 3, the side cover 6 has a side cover main body 62 and an inclined wall 63.

The side cover main body portion 62 is formed in a substantially rectangular shape when viewed from the width direction and the depth direction, and is formed to extend vertically along the downward direction. The side cover main body portion 62 is formed on the outer side surface 64 facing the inner side surface 61 in the form of a frame when viewed from above and below, and on the inner side surface 61 in the shape of a frame when viewed from the depth direction. And a holding portion 66. The locking portion 65 locks the side cover 6 to the box body 3 by inserting and fitting the locking portion 34 of the box body 3 when the side cover 6 is mounted on the box body 3 from the mounting direction. It is a thing. The holding portion 66 holds the heat dissipation member 8 on the side cover 6. As shown in FIG. 3, the holding portion 66 is formed at a position opposed to the inner side surface 61 with the heat radiation member 8 sandwiched in the holding state where the heat radiation member 8 is held by the side cover body portion 62. The holding portion 66 is formed so as to connect both surfaces of the insertion space 2d that face each other in the width direction in the attached state.

The inclined wall 63 is formed to be inclined so as to secure a gap between the side cover 6 and the electric wire with terminal 7. The inclined wall 63 is formed so as to project from the lower end of the side cover body 62. The side cover body 62 and the inclined wall 63 are continuously and integrally formed. The inclined wall 63 extends downward and is formed so as to be inclined in a direction away from the box body 3.

The terminal-attached electric wire 7 supplies electric power to a plurality of electronic components 100 via the stud bolts S from an electronic component outside the housing 2, such as a battery mounted on the vehicle body. The electric wire 7 with a terminal has a terminal 71 and an electric wire main body 72.

The terminal 71 is an LA terminal made of metal. The terminal 71 is electrically connected to the bus bar 10 by being fastened to the stud bolt S. The terminal 71 is a plate-shaped member and is formed to extend in a substantially rectangular shape having long sides. The terminal 71 has a through hole 71a at one end in the extending direction. The through hole 71a is a hole through which the stud bolt S penetrates. The terminal 71 has a crimp portion 71b on the other end side in the extending direction. The crimping portion 71b is deformed and held so that the wire body 72 placed on the terminal 71 is wound around the outer periphery of the wire body 72, with both ends in the direction orthogonal to the extending direction, that is, both ends in the short side direction, projecting laterally. The terminal 71 bends between the through hole 71a and the crimping portion 71b in the extending direction. That is, the terminal 71 is formed so as to extend from the accommodation space 2c to the insertion space 2d while being fastened to the stud bolt S, bend in the insertion space 2d, and extend downward. It When the terminal 71 is fastened to the stud bolt S, the terminal 71 is bent as described above, so that the surface on which the electric wire main body 72 is placed faces the side cover 6.

The electric wire main body 72 has conductivity and electrically connects electric power outside the housing 2, that is, electronic parts such as a power supply on the vehicle body side and the terminal 71. The electric wire main body 72 is formed by bundling a plurality of conductive wires and covering the outer circumference of the bundled conductive wires with an insulator. The electric wire main body 72 is positioned at a part including at least the end 72a in the insertion space 2d. In the wire body 72, the conductor wire is exposed to the outside of the insulator at the end 72a, and the terminal 71 is crimped. The wire main body 72 extends from the inside of the insertion space 2d to the outside of the housing 2 through the opening 2b at the lower end of the insertion space 2d.

The heat dissipation member 8 is a heat conductive member having heat conductivity, and is formed by, for example, pressing a plate-shaped metal material. The heat dissipation member 8 is thermally connected to the electric wire with terminal 7 in the accommodation space 2c. The heat dissipation member 8 projects from the accommodation space 2c into the insertion space 2d and extends toward the opening 2b. The heat dissipation member 8 of this embodiment has two bent portions 81, a thermal connection portion 82, and an extension portion 83.

The two bent portions 81 are portions that bend between the thermal connection portion 82 and the extending portion 83. Each bent portion 81 of this embodiment is formed by bending in the same direction toward the stud bolt S in a state where the heat dissipation member 8 is fastened to the stud bolt S.

The thermal connection portion 82 is a portion that is thermally connected to the electric wire with terminal 7, and extends in the extending direction from the bent portion 81 on the upper side toward the electric wire with terminal 7. The thermal connection part 82 of this embodiment is fastened with the terminal 71 of the electric wire 7 with a terminal and the bus bar 10 with respect to the stud bolt S arrange|positioned in the accommodation space part 2c. The thermal connection part 82 is exposed from the holding part 66 in the holding state. The thermal connection portion 82 has a through hole 8a. The through hole 8a is a hole through which the stud bolt S penetrates.

The extending portion 83 is a portion extending from the thermal connection portion 82 via the two bent portions 81 to the lower side in the up-down direction intersecting the extending direction. As shown in FIG. 5, the extension part 83 has an end portion of the extension part 83 below the terminal 71 of the terminal-attached electric wire 7 in a connected state where the heat dissipation member 8 is thermally connected to the terminal-attached electric wire 7. It is located between the side end and the opening 2b.

The bus bar 10 is a conductive member having conductivity and constitutes a part of an electric path passing through the electric junction box 1. On the electric path, one of the bus bars 10 is electrically connected to the plurality of electronic components 100 housed in the internal space 2a, and the other is electrically connected to the terminal-attached electric wire 7. As shown in FIG. 4, the bus bar 10 is formed by pressing a metal plate. The bus bar 10 has a through hole 10a at a portion to be fastened to the stud bolt S, and the stud bolt S is inserted into the through hole 10a in a state of being housed in the internal space 2a.

Next, a procedure for assembling the electrical junction box 1 according to this embodiment will be described. First, the worker assembles the electric wire (not shown) and the bus bar 10 connected to the stud bolt S to the sub block (not shown) housed in the internal space 2a of the box body 3 to produce the sub harness. Next, the worker inserts the sub-block together with the sub-harness into the internal space 2a from the lower side of the box body 3, and fits and fixes the sub-block on the block mounting member of the box body 3. Next, the worker mounts the electronic component 100 on each block from the upper side of the box body 3 and electrically connects the electronic component 100 and the electric wire. Next, the worker attaches the stud bolt S to the attachment member for the stud bolt S installed in the accommodation space 2c of the box body 3.

Next, the worker puts the end portion 72a of the electric wire main body 72 with the conductor exposed to the terminal 71 by removing the covering member. Next, the worker uses a jig to bend the terminal 71 substantially at a right angle between the through hole 71a and the crimp portion 71b in the extending direction of the terminal 71. The bending direction of the terminal 71 is a direction in which the surface on which the electric wire main body 72 is placed faces the peripheral wall 33 when the electric wire with terminal 7 is fastened to the stud bolt S. Next, the worker uses a jig to deform the crimp portion 71b so as to surround the end portion 72a of the electric wire body 72, and crimps the terminal 71 to the electric wire body 72.

Next, the worker inserts the electric wire with terminal 7 into the insertion space 2d, and penetrates the stud bolt S into the through hole 71a formed in the terminal 71 in the accommodation space 2c. Next, the worker inserts the heat radiation member 8 into the holding portion 66 of the side cover 6. At this time, the thermal connection portion 82 provided with the through hole 8a is exposed from the holding portion 66 in the holding state. Next, the worker attaches the side cover 6 to which the heat dissipation member 8 is attached to the box body 3 from the upper side to the lower side along the guide portion 35 of the box body 3. At this time, the worker attaches the side cover 6 to the box body 3 and causes the stud bolt S to penetrate the through hole 8a formed in the thermal connection portion 82 in the accommodation space 2c.

Next, the worker inserts a through hole, which is formed in the nut N and has a screw groove on the inner peripheral surface, into the stud bolt S in the accommodation space 2c, and rotates the nut N to screw it into the stud bolt S. .. As the worker continues to screw the nut N into the stud bolt S, the nut N comes into contact with the thermal connection portion 82. When the worker can no longer screw the nut N onto the stud bolt S, the terminal 71 of the electric wire with terminal 7 and the thermal connection portion 82 of the heat dissipation member 8 are attached to the stud bolt S together with the nut N. It is concluded.

As described above, the electrical junction box 1 according to the first embodiment accommodates the insertion space 2d that communicates with the outside of the housing 2 through the opening 2b and the bus bar 10, and communicates with the insertion space 2d. The housing space 2c and the heat dissipation member 8 having thermal conductivity and thermally connected to the electric wire with terminal 7 in the housing space 2c are provided. The electric wire 7 with a terminal is inserted into the insertion space 2d through the opening 2b and is electrically connected to the bus bar 10 in the accommodation space 2c. The heat dissipation member 8 projects from the accommodation space 2c into the insertion space 2d and extends toward the opening 2b. Therefore, in the electrical junction box 1, even if the connection portion between the electric wire with terminal 7 and the bus bar 10 generates heat due to energization, the heat dissipation member 8 connected to the electric wire with terminal 7 expands the heat dissipation surface, thereby increasing the temperature due to energization. The rise can be suppressed. Further, since the heat dissipation member 8 projects from the accommodation space 2c into the insertion space 2d and extends toward the opening 2b, the heat dissipation surface can be made longer and the heat dissipation member 8 can come into contact with the outside air through the opening 2b. It becomes easier and the effect of suppressing the temperature rise can be further exerted.

Further, the electric junction box 1 has a thermal connection portion 82 in which the heat dissipation member 8 is thermally connected to the electric wire 7 with a terminal and extends in the extending direction from the bent portion 81 toward the electric wire 7 with a terminal. The thermal connection portion 82 is fastened together with the terminal of the electric wire with terminal 7 and the bus bar 10 to the stud bolt S arranged in the accommodation space portion 2c. Therefore, the heat radiating member 8 can be connected to the terminal-attached electric wire 7 that supplies power from the outside of the housing 2 without changing the structure or assembly method of the terminal-attached electric wire 7 and the bus bar 10 that are fastened together with the stud bolt S. It will be possible. As a result, it is possible to suppress the temperature rise due to energization.

Further, in the electrical junction box 1, in the connected state in which the heat dissipation member 8 is thermally connected to the electric wire with terminal 7, the end of the extending portion 83 is opened with the lower end of the terminal 71 of the electric wire with terminal 7. It is located between the part 2b. Therefore, it is possible to prevent the extension portion 83 from protruding from the opening 2b to prevent a short circuit in the electric circuit due to contact with other components. Moreover, since the end of the extending portion 83 extends beyond the lower end of the terminal 71 of the electric wire with terminal 7, the heat dissipation member 8 can be brought closer to the opening 2b.

The electric junction box 1 is attached to the outer peripheral surface 33 a of the housing 2, and the side cover 6 extending downward is guided by the guide portion 35 of the housing 2 from the upper side to the lower side. It In the side cover 6, the heat dissipation member 8 is held by the holding portion 66. Therefore, for example, an operator can attach the side cover 6 to the housing 2 and at the same time insert the through hole 8a of the heat radiating member 8 into the stud bolt S, without changing the assembly method. It is possible to assemble.

In the first embodiment, the heat dissipation member 8 is fastened to the stud bolt S while being vertically sandwiched between the terminal 71 of the electric wire with terminal 7 and the nut N, but is not limited to this. Not a thing. For example, it may be fastened to the stud bolt S while being vertically sandwiched between the bus bar 10 and the terminal 71 of the electric wire with terminal 7.

[Second Embodiment]
Next, the electrical junction box according to the second embodiment will be described. FIG. 6 is a partially exploded perspective view showing a schematic configuration of the electrical junction box according to the second embodiment. FIG. 7: is a perspective view which shows schematic structure of the principal part of the electrical junction box which concerns on 2nd Embodiment. FIG. 8 is a partial vertical cross-sectional view showing the schematic configuration of the electrical junction box according to the second embodiment. In addition, in FIG. 7, the housing 2, the side cover 6, the stud bolt S, and the electric wire with a terminal 7 are omitted.

The electric junction box 1A according to the second embodiment differs from the electric junction box 1 according to the first embodiment in that the heat dissipation member 8 and the bus bar 10 are partially different in shape. The electrical junction box 1A according to the second embodiment has a basic configuration and a basic operation in common as compared with the electrical junction box 1 according to the first embodiment, and therefore the same reference numerals are omitted. Alternatively, the description will be simplified.

As shown in FIG. 7, the heat dissipation member 8A has a thermal connection portion 82A having a shape different from that of the thermal connection portion 82 of the first embodiment. The thermal connection part 82A is a busbar 10A electrically connected to the electric wire 7 with a terminal in a fastening state in which the terminal 71 of the electric wire 7 with a terminal and the busbar 10A are fastened to the stud bolt S arranged in the accommodation space 2c. It is locked by the locking mechanism 91 with respect to the locking piece 10b erected from the end of the. The locking piece 10b extends from the bus bar 10A in the same direction (upward) as the stud bolt S in a state where the bus bar 10A is housed in the housing 2. The two bent portions 81 of the present embodiment are formed by bending in different directions in the locked state in which the thermal connection portion 82A is locked by the locking piece 10b.

The thermal connection portion 82A has a locking mechanism 91, a base portion 92, and two connection portions 93 and 94. In the locked state, the locking mechanism 91 and the connecting portions 93, 94 extend downward. The connection parts 93 and 94 are flat plate-shaped components. The planar shape of the connecting portion 93 is, for example, a rectangle. The connecting portions 93 and 94 extend from the base portion 92 such that both surfaces of the connecting portions 93 and 94 and both surfaces of the base portion 92 are located on the same plane. That is, as shown in FIG. 7, the thermal connection part 82A is configured such that the base part 92 and the connection parts 93 and 94 are continuous flat plates when viewed along the depth direction. The connecting portions 93 and 94 are arranged with a gap along the depth direction.

The locking mechanism 91 extends from between the two connecting portions 93 and 94. Slits are formed between the locking mechanism 91 and the two connecting portions 93 and 94, respectively. The slit extends along the vertical direction. The locking mechanism 91 cooperates with the connecting portions 93 and 94 to sandwich the locking piece 10b. The locking mechanism 91 is configured such that the contact portion that contacts the locking piece 10b presses the thermal connection portion 82A toward the locking piece 10b side. The locking mechanism 91 is elastically deformed such that the contact portion is separated from the locking piece 10b by inserting the locking piece 10b between the connection portions 93, 94 and the contact portion. The locking mechanism 91 sandwiches the locking piece 10b with the connecting portions 93 and 94 by elastic restoring force, and holds the locking piece 10b in cooperation with the connecting portions 93 and 94.

Next, a procedure for assembling the electrical junction box 1A according to this embodiment will be described.

In the present embodiment, the worker inserts the heat radiation member 8A into the holding portion 66 of the side cover 6 before the stud bolt S penetrates the through hole 71a formed in the terminal 71 in the accommodation space 2c. At this time, the thermal connection portion 82A having the locking mechanism 91 is exposed from the holding portion 66 in the holding state. Next, the worker attaches the side cover 6 to which the heat dissipation member 8 is attached to the box body 3 from the upper side to the lower side along the guide portion 35 of the box body 3. At this time, the worker assembles the side cover 6 to the box body 3 and inserts the locking piece 10b between the locking mechanism 91 and the connecting portions 93 and 94 to lock the side cover 6 in the accommodation space 2c. The thermal connection portion 82A is locked to the piece 10b.

Next, the worker inserts a through hole, which is formed in the nut N and has a screw groove on the inner peripheral surface, into the stud bolt S in the accommodation space 2c, and rotates the nut N to screw it into the stud bolt S. .. When the worker continues to screw the nut N into the stud bolt S, the nut N comes into contact with the terminal 71 of the electric wire with terminal 7. When the worker can no longer screw the nut N onto the stud bolt S, the terminal 71 of the electric wire with terminal 7 is fastened to the stud bolt S together with the nut N.

As described above, the electrical junction box 1A according to the second embodiment has the same effects as the electrical junction box 1 according to the first embodiment, and the heat dissipation member 8A can be easily assembled to the bus bar 10A. it can.

Further, the electrical connection box 1A is locked with the thermal connection portion 82A of the heat dissipation member 8A being fastened with the terminal of the electric wire with terminal 7 and the bus bar 10A fastened to the stud bolt S arranged in the accommodation space 2c. It is locked by the mechanism 91 to the locking piece 10b provided upright from the end of the bus bar 10A. Therefore, the heat dissipation member 8A can be connected to the electric wire with a terminal 7 that supplies power from the outside of the housing 2 without changing the structure or assembly method of the electric wire with a terminal 7 and the bus bar 10A that are fastened together with the stud bolt S. It will be possible. As a result, it is possible to suppress the temperature rise due to energization.

In addition, in the electrical connection box 1A, in the connected state where the heat dissipation member 8A is thermally connected to the bus bar 10A, the end of the extending portion 83 is located at the lower end of the terminal 71 of the electric wire with terminal 7 and the opening 2b. Located between and. Therefore, the same effect as that of the electric junction box 1 according to the first embodiment can be obtained.

In addition, in the said 1st and 2nd embodiment, although the heat dissipation members 8 and 8A have two bending parts 81, it is not limited to this. For example, the number of bent portions 81 may be one, or may be three or more.

1, 1A Electrical junction box 2 Housing 2a Internal space 2b Opening 2c Storage space 2d Insertion space 3 Box body 33 Peripheral wall 33a Outer peripheral surface 34 Locking portion 35 Guide portion 4 Upper cover 5 Lower cover 6 Side cover 62 Side cover Main body 63 Inclined wall 64 Outer side surface 7 Terminal-equipped electric wire 71 Terminal 72 Electric wire main body 8,8A Heat dissipation member 81 Bent portion 82 Thermal connection portion 83 Extended portion 8a Through hole 91 Locking mechanism 92 Base portion 93, 94 Connection portion 10, 10A Bus bar 10a Through hole 10b Locking piece 100 Electronic component N Nut S Stud bolt WH Wire harness

Claims (5)

A housing containing one or more electronic components,
At least a conductive member electrically connected to the electronic component,
An insertion space portion provided in the housing and communicating with the outside of the housing through an opening,
An accommodating space portion that accommodates the conductive member and communicates with the insertion space portion,
With a terminal which is inserted through the insertion space through the opening and electrically connected to the conductive member in the accommodation space, and which supplies power from outside the housing to the electronic component through the conductive member Electric wire,
A heat dissipation member having thermal conductivity, which is thermally connected to at least one of the electric wire with a terminal and the conductive member in the accommodation space,
Equipped with
The heat dissipation member is
An electrical junction box characterized in that it projects from the accommodation space portion to the insertion space portion and extends toward the opening portion. The heat dissipation member is
At least one bend,
Thermally connected to the terminal-equipped electric wire, a thermal connection portion extending in the extending direction from the bent portion toward the terminal-equipped electric wire,
An extending portion extending from the thermal connection portion to a lower side in the up-down direction that intersects the extending direction via a bent portion,
Have
The thermal connection is
The electrical junction box according to claim 1, which is fastened to a fastening member arranged in the accommodation space together with the terminal of the electric wire with a terminal and the conductive member. The heat dissipation member is
At least one bend,
Thermally connected to the terminal-equipped electric wire, a thermal connection portion extending in the extending direction from the bent portion toward the terminal-equipped electric wire,
An extending portion extending from the thermal connection portion to a lower side in the up-down direction that intersects the extending direction via a bent portion,
Have
The thermal connection is
In a fastening state in which the terminal of the electric wire with a terminal and the conductive member are fastened to the fastening member arranged in the accommodation space, it is erected from the end of the conductive member electrically connected to the electric wire with a terminal. The electric connection box according to claim 1, wherein the electric connection box is locked to the locking piece by a locking mechanism. The heat dissipation member is
In a connected state in which it is thermally connected to at least one of the electric wire with terminal and the conductive member, the end of the extending portion is located between the lower end of the terminal of the electric wire with terminal and the opening. The electrical junction box according to claim 2 or 3. The housing is
A side cover attached to the outer peripheral surface and extending downward,
A guide portion that guides the side cover from the upper side to the lower side,
Have
The insertion space portion,
Formed by the housing and the side cover,
The side cover is
The electrical junction box according to claim 1, further comprising a holding portion that holds the heat dissipation member.

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