JP2020174155A - Heat dissipation structure, electrical junction box, and wire harness - Google Patents

Abstract

To provide a heat dissipation structure capable of properly dissipating heat from electronic components, an electrical junction box, and a wire harness.SOLUTION: A heat dissipation structure 20 includes a fuse 21 and a heat dissipation electric wire 24. The fuse 21 is provided between a power supply 6 and a load unit 5 and is configured to include a first terminal 21a connected to the power supply 6 and a second terminal 21b connected to the load unit 5. The heat dissipation electric wire 24 is a conductive member. One end thereof is connected to the second terminal 21b, and the other end is assembled to an insulating housing 10 for housing the fuse 21.SELECTED DRAWING: Figure 3

Description

The present invention relates to a heat dissipation structure, an electrical junction box, and a wire harness.

Conventionally, as an electric junction box applied to a wire harness mounted on a vehicle or the like, for example, Patent Document 1 discloses an electric junction box containing a fuse having a fusible portion that blows due to an overcurrent.

JP-A-2018-033236

By the way, the electric junction box described in Patent Document 1 described above has room for further improvement in that, for example, the heat of the fuse is dissipated.

Therefore, the present invention has been made in view of the above, and an object of the present invention is to provide a heat radiating structure, an electric junction box, and a wire harness capable of appropriately radiating heat from electronic components.

In order to solve the above-mentioned problems and achieve the object, the heat radiating structure according to the present invention is provided between the power supply and the load unit, and is connected to the first terminal connected to the power supply and the load unit. A first electronic component including two terminals and a heat-dissipating member that is a conductive member and has one end connected to the second terminal and the other end assembled to an insulating housing accommodating the first electronic component. It is characterized by including a conductive member for use.

In the heat dissipation structure, it is preferable to further provide a heat dissipation terminal provided in the housing and to which the other end of the conductive member is connected.

In the heat dissipation structure, the housing includes a component holding portion that has a plurality of tubular portions into which terminals of the second electronic component different from the first electronic component can be inserted and holds the second electronic component. The heat dissipation terminal is preferably inserted into the surplus cylinder portion while the second electronic component is held by the component holding portion.

In the heat radiating structure, the heat radiating terminal has a conductive terminal body connected to the other end of the conductive member and an insulating side opposite to the conductive member side of the terminal body. It is preferable that the holding portion includes a holding portion provided at the upper end portion which is an end portion of the above, and the holding portion is formed with an opening for exposing the upper end portion.

In the heat dissipation structure, the first electronic component is a fuse provided between the first terminal and the second terminal and including a fusible material that is blown by an overcurrent flowing from the power source to the load portion. It is preferable to have.

In the heat dissipation structure, it is preferable to further include an electric power supply electric wire having one end connected to the second terminal to supply electric power to the load portion.

The electric junction box according to the present invention includes an insulating housing for accommodating the first electronic component inside and a heat radiating structure housed inside the housing, and the radiating structure includes a power supply and a load unit. The first electronic component provided between the two and the first terminal connected to the power supply and the second terminal connected to the load portion, and a conductive member having one end thereof. It is characterized by including a conductive member for heat dissipation, which is connected to two terminals and the other end of which is assembled to the housing.

The wire harness according to the present invention includes a conductive wiring material, an insulating housing that houses a first electronic component electrically connected to the wiring material, and the inside of the housing. A first terminal provided between a power source and a load unit and connected to the power source and a second terminal connected to the load unit are provided with an electrical connection box including a heat radiation structure housed in the power supply. The first electronic component including the above, and a conductive member which is a conductive member and has one end connected to the second terminal and the other end assembled to the housing for heat dissipation. And.

The heat dissipation structure, electrical junction box, and wire harness according to the present invention are provided by a conductive member for heat dissipation, one end of which is connected to a terminal of an electronic component and the other end of which is assembled to an insulating housing for accommodating the electronic component. The heat of electronic components can be dissipated properly.

FIG. 1 is a diagram showing an example of mounting a relay according to an embodiment. FIG. 2 is a diagram showing an example of inserting a spacer for heat dissipation according to the embodiment. FIG. 3 is a diagram showing a heat dissipation structure according to the embodiment. FIG. 4 is a diagram showing a configuration example of a spacer for heat dissipation according to the embodiment. FIG. 5 is a diagram showing an example of electric wire conversion by a dummy terminal according to a reference example.

An embodiment (embodiment) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. In addition, the components described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Further, the configurations described below can be combined as appropriate. In addition, various omissions, substitutions or changes of the configuration can be made without departing from the gist of the present invention.

[Embodiment]
The heat dissipation structure 20, the electrical junction box 1, and the wire harness 100 according to the embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing an example of mounting the relay 2 according to the embodiment. FIG. 2 is a diagram showing an example of inserting the spacer 26 for heat dissipation according to the embodiment. FIG. 3 is a diagram showing a heat dissipation structure 20 according to the embodiment. FIG. 4 is a diagram showing a configuration example of the spacer 26 for heat dissipation according to the embodiment.

As shown in FIGS. 1 to 3, the electric connection box 1 according to the present embodiment is mounted on a vehicle such as an automobile and incorporated into the wire harness 100. The wire harness 100 is, for example, a bundle of a plurality of wiring materials 3 used for power supply and signal communication for connection between devices mounted on a vehicle to form an aggregate, and a plurality of wiring with a connector or the like. The material 3 is connected to each device. The wire harness 100 includes a conductive wiring material 3 and an electrical connection box 1 that is electrically connected to the wiring material 3. The wiring material 3 is composed of, for example, a metal rod, an electric wire, a bundle of electric wires, and the like. The metal rod is formed by covering the outside of a rod-shaped member having conductivity with an insulating coating portion. An electric wire is formed by covering the outside of a conductor portion (core wire) made of a plurality of conductive metal strands with an insulating covering portion. The electric wire bundle is a bundle of the electric wires. In the wire harness 100, a plurality of wiring materials 3 are bundled and aggregated, and the electric junction box 1 is electrically connected via a connector or the like provided at the terminal of the bundled wiring materials 3. The wire harness 100 may also include a grommet, a protector, an exterior material, a fixture, and the like.

The electrical junction box 1 collects electrical components such as a fuse 21 as a first electronic component and a relay 2 as a second electronic component and houses them inside. The electric junction box 1 is installed, for example, in the engine room or the vehicle interior of the vehicle. The electric junction box 1 is connected between a power source 6 such as a battery and a load unit 5 of various electronic devices mounted in a vehicle via a wiring material 3 or the like. The electric junction box 1 distributes the electric power supplied from the power source 6 to the load unit 5 of various electronic devices in the vehicle. The electric junction box 1 may also be called a junction box, a fuse box, a relay box, or the like, but in the present embodiment, these are collectively referred to as an electric junction box. Hereinafter, the configuration of the electrical junction box 1 will be described in detail with reference to each figure.

Specifically, the electrical junction box 1 includes a relay 2, a fuse 21, a housing 10, and a heat dissipation structure 20. The relay 2 is a 4-pole relay 2A provided with four relay terminals 2a or a five-pole relay 2A provided with five relay terminals 2a. The 4-pole relay 2A energizes or cuts off the current flowing through the first load unit (not shown). The 5-pole relay 2B is switched so that a current flows through either the first load unit or the second load unit (not shown).

The fuse 21 cuts off the current flow path when an overcurrent flows. The fuse 21 is provided between the power supply 6 and the load unit 5. The fuse 21 includes a first terminal 21a, a second terminal 21b, and a fusible body 21c. The first terminal 21a is formed of a conductive member and is electrically connected to the power supply 6 via the wiring material 3. The second terminal 21b is formed of a conductive member and is electrically connected to the load portion 5. The soluble body 21c is formed of a conductive member having a low melting point, and is provided between the first terminal 21a and the second terminal 21b. The fusible body 21c is blown by an overcurrent flowing from the power source 6 to the load unit 5. The fuse 21 cuts off the electrical connection between the power supply 6 and the load unit 5 by blowing the fusible body 21c.

The housing 10 houses the relay 2, the fuse 21, and the like inside. The housing 10 is formed of an insulating resin or the like, and includes a relay holding portion 11 as a component holding portion and a fuse holding portion 12. The relay holding unit 11 holds the relay 2. The relay holding portion 11 has a plurality of cavities 11a and 11b as a plurality of tubular portions. The relay holding portion 11 is composed of cavities 11a provided at four locations and cavities 11b provided at one location with respect to one relay 2. That is, the relay holding portion 11 is composed of a total of five cavities 11a and 11b for one relay 2. When the relay holding unit 11 holds the four-pole relay 2A, each relay terminal 2a of the relay 2A is inserted into the four cavities 11a to hold the respective relay terminals 2a. On the other hand, when the relay holding unit 11 holds the 5-pole relay 2B, each relay terminal 2a of the relay 2B is inserted into the four cavities 11a and one cavity 11b to hold the respective relay terminals 2a. ..

In the four cavities 11a, with the relay terminals 2a of the four-pole relay 2A inserted, the other side terminal (not shown) is inserted from the side opposite to the relay 2A, and the other side terminal is each relay terminal. It is electrically connected to 2a. As a result, the relay holding unit 11 can hold the relay 2A in a state where each relay terminal 2a of the four-pole relay 2A is inserted into the cavity 11a.

In the four cavities 11a and one cavity 11b, with the relay terminals 2a of the five-pole relay 2B inserted, the other side terminal (not shown) is inserted from the side opposite to the relay 2B and the other party. The side terminals are electrically connected to each relay terminal 2a. As a result, the relay holding unit 11 can hold the relay 2B with the relay terminals 2a of the five-pole relay 2B inserted into the cavities 11a and 11b. In this way, since the relay holding unit 11 can hold the 4-pole relay 2A and the 5-pole relay 2B, the electrical connection box 1 is shared with the 4-pole relay 2A and the 5-pole relay 2B. can do. As a result, the electric junction box 1 can suppress the redesign of the electric junction box 1 and the mold, and can suppress the development cost.

When the relay holding portion 11 holds the 4-pole relay 2A, if the spacer 26 for heat dissipation is inserted into the excess cavity 11b in advance in the manufacturing process of the wire harness 100, the 5-pole relay 2B is erroneously inserted. Can be prevented from being held.

The fuse holding unit 12 holds the fuse 21. The fuse holding portion 12 has a fuse mounting portion (not shown), and the fuse 21 is held by mounting the fuse 21 on the fuse mounting portion.

The heat dissipation structure 20 includes the above-mentioned fuse 21, an electric wire 22, an electric wire 23 for supplying power, an electric wire 24 for heat dissipation as a conductive member for heat dissipation, a connection terminal 25, and a spacer 26 for heat dissipation. It is composed of, and is housed inside the housing 10.

The electric wire 22 electrically connects the power supply 6 and the first terminal 21a of the fuse 21. One end of the electric wire 22 is connected to the power supply 6 side, and the other end is connected to the first terminal 21a of the fuse 21. The electric wire 22 causes a current to flow from the power source 6 to the fuse 21.

The electric wire 23 for supplying electric power is an electric wire for supplying electric power to the load unit 5. The electric wire 23 for power supply electrically connects the second terminal 21b of the fuse 21 and the terminal of the load unit 5. One end of the electric wire 23 for power supply is connected to the second terminal 21b of the fuse 21, and the other end is connected to the terminal of the load portion 5. The electric wire 23 for power supply causes a current to flow from the fuse 21 to the load unit 5. Here, in the electric wire 23 for power supply, the cross-sectional area (wire diameter) of the electric wire connected to the load portion 5 side is defined by the terminal crimping requirement of the load portion 5. The electric wire 23 for power supply has, for example, a cross-sectional area of 3 sq (square millimeter). The electric wire 23 for power supply realizes a heat dissipation function by the electric wire 24 for heat dissipation, so that a thick electric wire for heat dissipation (for example, a 5sq electric wire) can be changed to a thin electric wire for load connection (for example, 3sq) by splice as in the conventional case. It can be connected by one electric wire without converting the wire diameter to the electric wire). The cross-sectional area of the electric wire 23 for power supply described above is appropriately changed according to the design.

The heat radiating electric wire 24 dissipates heat from the fuse 21. The heat-dissipating electric wire 24 is a conductive member and is different from the electric power supply electric wire 23. One end of the heat radiating electric wire 24 is directly connected to the second terminal 21b, and the other end is assembled to the housing 10 accommodating the fuse 21. The heat-dissipating electric wire 24 has, for example, a cross-sectional area of 2 sq (square millimeter). The heat-dissipating electric wire 24 has a cross-sectional area of 2 sq, so that the cross-sectional area is 5 sq together with the cross-sectional area (3 sq) of the electric wire 23 for power supply, and the required heat-dissipating effect is satisfied. The cross-sectional area of the heat-dissipating electric wire 24 is appropriately changed according to the design. The heat-dissipating electric wire 24 is provided with a connection terminal 25 at the other end, and by connecting the connection terminal 25 to a heat-dissipating spacer 26 described later, a relay of the housing 10 is relayed via the heat-dissipating spacer 26. It is assembled to the holding portion 11. The heat radiating electric wire 24 conducts the heat generated in the fuse 21 to the heat radiating spacer 26, and radiates the heat of the fuse 21 through the heat radiating spacer 26.

The heat radiating spacer 26 has a function of radiating heat. The heat dissipation spacer 26 is inserted into the surplus cavity 11b in a state where the 4-pole relay 2A is held by the relay holding portion 11, and functions as a pseudo terminal. As shown in FIG. 4, the heat radiating spacer 26 includes a terminal body 26a and a holding portion 26b. The terminal body 26a has conductivity and is formed in a rectangular shape and a plate shape. The terminal body 26a is connected to the connection terminal 25 of the heat radiating electric wire 24 in a state of being inserted into the cavity 11b.

The holding portion 26b has an insulating property and is provided at an upper end portion 26d which is an end portion of the terminal body 26a opposite to the heat radiating electric wire 24 side. The holding portion 26b is formed in a rectangular parallelepiped shape and covers the entire upper end portion 26d of the terminal body 26a. The holding portion 26b is formed so that the long side and the short side of the holding portion 26b are longer than the long side and the short side of the terminal body 26a when viewed from the insertion direction of being inserted into the cavity 11b. That is, the holding portion 26b surrounds the outer shape of the terminal body 26a when viewed from the insertion direction. As a result, the holding portion 26b can prevent the terminal body 26a from falling out from one side of the cavity 11b while being inserted into the cavity 11b.

The holding portion 26b is formed with an opening 26c that exposes the upper end portion 26d of the terminal body 26a. The opening 26c is formed in an elliptical shape having, for example, a long axis in the direction along the long side of the holding portion 26b and a short axis in the direction along the short side when viewed from the insertion direction. The heat radiating spacer 26 dissipates heat conducted from the heat radiating electric wire 24 to the terminal body 26a from the opening 26c of the holding portion 26b and the like.

As described above, the heat radiating structure 20 according to the embodiment includes a fuse 21 and a heat radiating electric wire 24. The fuse 21 is provided between the power supply 6 and the load unit 5, and includes a first terminal 21a connected to the power supply 6 and a second terminal 21b connected to the load unit 5. The heat-dissipating electric wire 24 is a conductive member, one end of which is connected to the second terminal 21b, and the other end of which is assembled to an insulating housing 10 accommodating a fuse 21.

In the conventional heat dissipation structure (not shown), the heat of the fuse 21 is dissipated by making the cross-sectional area of the first electric wire connected to the second terminal 21b of the fuse 21 larger than the required cross-sectional area. Therefore, in the conventional heat dissipation structure, the first electric wire (for example, a 5 sq electric wire) connected to the second terminal 21b and the second electric wire (for example, 3 sq) having a smaller cross-sectional area than the first electric wire connected to the load unit 5 (Electric wire) was connected via a splice.

On the other hand, in the heat radiating structure 20 according to the embodiment, the heat of the fuse 21 can be radiated through the electric wire 24 for heat radiating, so that 1 is performed between the fuse 21 and the load unit 5 without using a splice. It can be connected by the electric wire 23 for power supply of the book (for example, the electric wire of 3 sq). In this way, the heat dissipation structure 20 can appropriately dissipate the heat of the fuse 21 and suppress the temperature rise of the fuse 21. Further, in the heat dissipation structure 20, the cross-sectional area of the electric wire 23 for power supply can be reduced, and the wire diameter can be reduced. As a result, the heat dissipation structure 20 can improve the wiring property of the electric wire 23 for power supply, and can suppress the manufacturing cost.

The heat dissipation structure 20 is further provided with a heat dissipation spacer 26 provided in the housing 10 and to which the other end of the heat dissipation electric wire 24 is connected. With this configuration, the heat dissipation structure 20 can appropriately dissipate the heat of the fuse 21 via the heat dissipation spacer 26.

In the heat dissipation structure 20, the housing 10 includes a relay holding portion 11. The relay holding unit 11 has a plurality of cavities 11a and 11b into which relay terminals 2a of the relay 2, which is an electronic component different from the fuse 21, can be inserted, and holds the relay 2. The heat dissipation spacer 26 is inserted into the surplus cavity 11b with the 4-pole relay 2A held by the relay holding portion 11. With this configuration, the heat dissipation structure 20 can effectively utilize the surplus cavity 11b, and it is possible to suppress the preparation of a cavity for mounting the spacer 26 for heat dissipation. Further, the heat dissipation structure 20 can prevent the unintended relay 2 from being held by the relay holding portion 11 by mounting the heat dissipation spacer 26 in the surplus cavity 11b.

In the heat dissipation structure 20, the heat dissipation spacer 26 includes a terminal body 26a and a holding portion 26b. The terminal body 26a has conductivity and is connected to the other end of the heat radiating electric wire 24. The holding portion 26b has an insulating property and is provided at an upper end portion 26d which is an end portion of the terminal body 26a opposite to the side of the electric wire 24 for heat dissipation. The holding portion 26b is formed with an opening 26c that exposes the upper end portion 26d. With this configuration, the heat radiating structure 20 can dissipate the heat conducted from the heat radiating electric wire 24 to the terminal body 26a from the opening 26c of the holding portion 26b, and the heat radiating effect can be improved.

In the heat dissipation structure 20, the fuse 21 is provided between the first terminal 21a and the second terminal 21b, and includes a fusible body 21c that is blown by an overcurrent flowing from the power source 6 to the load unit 5. In the present embodiment, the heat dissipation structure 20 uses a fuse 21 as an electronic component to be heat-dissipated.

In the heat dissipation structure 20, one end is connected to the second terminal 21b, and a power supply electric wire 23 for supplying power to the load unit 5 is further provided. The heat dissipation structure 20 dissipates heat from the fuse 21 by a heat dissipation wire 24 different from the power supply wire 23.

The electrical junction box 1 includes an insulating housing 10 that houses the fuse 21 inside, and a heat radiating structure 20 that is housed inside the housing 10. With this configuration, the electrical junction box 1 can exert the same effect as the heat dissipation structure 20 described above.

The wire harness 100 is housed in an insulating housing 10 that houses a conductive wiring material 3 and a fuse 21 that is electrically connected to the wiring material 3 inside, and inside the housing 10. The electric connection box 1 including the heat dissipation structure 20 is provided. With this configuration, the wire harness 100 can exert the same effect as the heat dissipation structure 20 described above.

In the above description, the heat radiating structure 20 includes a heat radiating spacer 26 to which the other end of the heat radiating electric wire 24 is connected, but the present invention is not limited to this. In the heat radiating structure 20, for example, the other end of the heat radiating electric wire 24 may be directly assembled to the housing 10 without using the heat radiating spacer 26. Further, in the heat dissipation structure 20, the other end of the heat dissipation electric wire 24 may be connected to a metal component such as a bolt provided in the housing 10.

Although the example in which the spacer 26 for heat dissipation is inserted into the surplus cavity 11b when the relay holding portion 11 holds the 4-pole relay 2A, the present invention is not limited to this. The heat radiating spacer 26 may be inserted into a cavity provided exclusively for heat radiating.

In the heat radiating spacer 26, an example in which the holding portion 26b is formed with an opening 26c that exposes the upper end portion 26d has been described, but the present invention is not limited to this, and the opening 26c may not be formed.

The heat dissipation structure 20 has been described by taking a fuse 21 as an example of an electronic component to be dissipated, but the heat dissipation structure 20 is not limited to the fuse 21, and any electronic component housed in the electrical junction box 1 is another electronic component. You may.

[Reference example]
Next, a reference example of the embodiment will be described. FIG. 5 is a diagram showing an example of electric wire conversion by the dummy terminal 7 according to the reference example. As shown in FIG. 5, for example, the dummy terminal 7 is provided between the electric wire 8 and the electric wire 9, and is electrically connected to one end of the electric wire 8 and electrically connected to one end of the electric wire 9. .. The dummy terminal 7 converts the wire diameters of the electric wires 8 and 9 between the electric wire 8 (for example, a 5 sq electric wire) and the electric wire 9 (for example, a 3 sq electric wire). In the reference example, the wire diameter is converted using the dummy terminal 7 without using the splice.

1 Electrical junction box 2, 2A, 2B relay (second electronic component)
2a Relay terminal (terminal)
3 Arrangement material 5 Load part 6 Power supply 10 Housing 11 Relay holding part (parts holding part)
11a, 11b cavities (cylinder)
20 Heat dissipation structure 21 Fuse (first electronic component)
21a 1st terminal 21b 2nd terminal 21c Soluble body 23 Electric wire for power supply 24 Electric wire for heat dissipation (conductive member for heat dissipation)
26 Spacer for heat dissipation (terminal for heat dissipation)
26a Terminal body 26b Holding part 26c Opening part 26d Upper end part 100 Wire harness

Claims (8)

A first electronic component provided between the power supply and the load unit and including a first terminal connected to the power supply and a second terminal connected to the load unit.
A conductive member for heat dissipation, which is a conductive member and one end is connected to the second terminal and the other end is assembled to an insulating housing for accommodating the first electronic component.
A heat dissipation structure characterized by being equipped with. The heat dissipation structure according to claim 1, further comprising a heat dissipation terminal provided in the housing and to which the other end of the conductive member is connected. The housing is configured to include a component holding portion that has a plurality of tubular portions into which terminals of a second electronic component different from the first electronic component can be inserted and holds the second electronic component.
The heat radiating structure according to claim 2, wherein the heat radiating terminal is inserted into the surplus cylinder portion in a state where the second electronic component is held by the component holding portion. The heat-dissipating terminal is a terminal body having conductivity and being connected to the other end of the conductive member, and an end portion of the terminal body having insulation and opposite to the conductive member side. It is configured to include a holding part provided at the upper end.
The heat dissipation structure according to claim 2 or 3, wherein the holding portion is formed with an opening that exposes the upper end portion. The first electronic component is a fuse provided between the first terminal and the second terminal and including a fusible material that is blown by an overcurrent flowing from the power source to the load portion. The heat dissipation structure according to any one of 4. The heat dissipation structure according to any one of claims 1 to 5, further comprising an electric power supply electric wire having one end connected to the second terminal to supply electric power to the load unit. An insulating housing that houses the first electronic component inside,
It is provided with a heat radiating structure housed inside the housing.
The heat dissipation structure is
The first electronic component provided between the power supply and the load unit and including a first terminal connected to the power supply and a second terminal connected to the load unit.
A conductive member for heat dissipation, one end of which is connected to the second terminal and the other end of which is assembled to the housing.
An electrical junction box characterized by being equipped with. Conductive wiring material and
It is provided with an insulating housing that houses a first electronic component that is electrically connected to the wiring material, and an electrical connection box that includes a heat dissipation structure that is housed inside the housing.
The heat dissipation structure is
The first electronic component provided between the power supply and the load unit and including a first terminal connected to the power supply and a second terminal connected to the load unit.
A conductive member for heat dissipation, one end of which is connected to the second terminal and the other end of which is assembled to the housing.
A wire harness characterized by being provided with.

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