JP3555477B2 - Connection structure of electric circuit - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a connection structure for an electric circuit, and more particularly, to an electric circuit to which a large current is supplied can efficiently dissipate heat.
[0002]
[Prior art]
As shown in FIG. 4, for example, a circuit wire 1 and 2 for supplying a large current connected to a battery mounted on a vehicle and an alternator are connected to a bus bar 3 a constituting an electric circuit in the relay block 3. The portion 3b is divided and connected by bolts B via connection terminals 1a and 2a. When a large current is supplied to the electric circuit in the direction indicated by arrow A, heat is generated in the vicinity of the connection portion 3b.
[0003]
In order to suppress the heat generation, it is effective to increase the size of the electric wire. However, depending on the terminal size corresponding to the mating component, it may not be possible to crimp the connection terminal 1a. It is also conceivable to increase the thickness of the bus bar 3a, but this may not be possible due to the effective space of the relay block 3.
[0004]
[Problems to be solved by the invention]
In view of this, as shown in FIG. 5, a circuit wire 5 and a heat radiating wire 6 are commonly crimped to the connection terminal 4 so that excess heat is radiated from the heat radiating wire 6 (Japanese Patent Application Laid-Open No. HEI 9-103572). No. 9-35766).
[0005]
However, since the heat radiating wire 6 is spirally wound around the circuit wire 5 and the terminal is fixed to the circuit wire 5 with the tape T, the heat radiating area of the heat radiating wire 6 is reduced, and the heat radiation efficiency is reduced. Will decrease. In addition, since the terminal treatment of the heat radiating wire 6 is also performed by winding the normal tape T, the core wire of the heat radiating wire 6 is easily exposed by the winding of the tape T.
[0006]
The present invention has been made in view of the above-described problems, and, while improving the heat radiation effect of the electric circuit, a connection structure of an electric circuit that has been subjected to a terminal treatment capable of reliably preventing a core wire from being exposed to a terminal of the heat radiation wire. The task is to provide.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention relates to a connection structure of an electric circuit in which a connection terminal crimped to an end of a circuit electric wire for supplying a large current is connected to a connection portion of a bus bar forming an electric circuit,
One end of the heat-dissipating wire is crimped together with the circuit wire to the connection terminal, and the other end of the heat-dissipating wire extends in a state separated from the circuit wire, and is connected only to the terminal of the heat-dissipating wire. An insulation tape is formed by winding an insulation tape, and the insulation treatment part is provided with an extension part which is wound around a tape from a position in front of the terminal of the heat radiating wire and extends to a position slightly beyond the terminal. The portion is folded back to the end of the heat-dissipating electric wire, and is further wound around and fixed to the end with a tape to provide a connection structure for an electric circuit.
[0008]
According to the above configuration, the heat generated in the electric circuit due to the supply of the large current can be radiated by the heat radiating wire through the connection fitting connected to the connection portion of the bus bar. Since it is completely separated from the electric wire, the heat radiation area is large, and a large heat radiation effect can be obtained. In addition, since the end of the heat-radiating wire is double-wrapped by folding the extended portion extended by tape winding, the core wire of the terminal of the heat-radiating wire is exposed even by peeling off a little tape. Can be reliably prevented.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows, as an example of a connection structure of an electric circuit, a structure in which a path from a battery 10a to an alternator 10b is divided and connected to a relay block 13 mounted on a vehicle. A bus bar 13a constituting an electric circuit is disposed in the relay block 13, a tab 13c for connection to a device requiring a large current is formed at one end, and a circuit tab connected to the battery 10a is formed at the other end. A plate-shaped connecting portion 13b having screw holes 13d and 13e for connecting the electric wire 11 and the circuit electric wire 12 connected to the alternator 10b is formed.
[0010]
On the other hand, as shown in FIG. 2, connection terminals 11a and 12a having bolt holes Ba are crimped to the terminals of the circuit wires 11 and 12, and the circuit wires 11 and 12 are attached to the connection terminals 11a and 12a. At the same time, one ends of the heat radiating wires 16 and 17 are crimped in common. The other ends of the heat radiating wires 16 and 17 extend apart from the circuit wires 11 and 12 in order to secure a heat radiating surface area, and the terminals are provided with insulation treatment portions 16a and 17a to prevent the core wires from being exposed. I am giving it.
[0011]
As shown in FIG. 3A, the insulation processing sections 16a and 17a wind an insulating tape Ta inward from the ends of the heat-radiating wires 16 and 17 by a required dimension a from the near side, as shown in FIG. As described above, the extended portions 16b and 17b are formed by extending the insulating tape Ta from the terminal to a position slightly beyond the dimension b.
[0012]
Next, as shown in FIGS. 3 (C) and 3 (D), the extension portions 16b and 17b are folded inward, and the insulating tape Ta is further wound and fixed, so that the terminal portion is reliably insulated. Parts 16a and 17a can be obtained (FIG. 3E).
[0013]
The connection terminals 11a and 12a, which are commonly crimped to the ends of the circuit wires 11 and 12 and the heat dissipation wires 16 and 17 as described above, respectively match the screw holes 13d and 13e of the connection portion 13b of the relay block 13. Then, a required electric circuit is formed by tightening and fixing with a bolt B. When a large current is supplied from the battery 10a to the connection structure of the electric circuit having the above-described configuration, heat is generated in the vicinity of the connection portion 13b, but the heat is separated from the circuit wires 11 and 12, and the heat radiation area is large. Heat is efficiently radiated through the set heat radiation wires 16 and 17. In addition, since the extension portions 16b, 17b of the wound insulating tape T are folded back at the ends of the heat radiation wires 16, 17, the core wires are not exposed from the ends since the tapes are further wound.
[0014]
【The invention's effect】
As is clear from the above description, according to the connection structure of the electric circuit of the present invention, a large current is supplied, and the heat generated at the connection portion can be radiated by the heat diffusion of the heat radiating wire. Since it is separated from the utility wire, a sufficient heat dissipation area can be obtained, and heat dissipation efficiency can be improved. In addition, since the end portion of the heat radiating wire is folded inward from the end portion by winding the insulating tape and folded back inward to further fix the tape, the exposure of the core wire from the end portion is reliably prevented. be able to.
[Brief description of the drawings]
FIG. 1 is a drawing showing a connection structure of an electric circuit of the present invention.
FIG. 2 is a drawing showing a common crimped state of a circuit wire and a heat dissipation wire to a connection terminal.
3 (A) to 3 (E) are drawings showing a terminal treatment step of a heat dissipation wire.
FIG. 4 is a drawing showing a conventional example.
FIG. 5 is a drawing showing a conventional example.
[Explanation of symbols]
B Bolt Ta Insulating tape 11, 12 Circuit wires 11a, 12a Connection terminal 13a Bus bar 13b Connection portion 16, 17 Heat radiation wires 16a, 17a Insulation processing portion 16b, 17b Extension portion

Claims (1)

In a connection structure of an electric circuit in which a connection terminal crimped to an end of a circuit wire that supplies a large current is connected to a connection portion of a bus bar that forms an electric circuit,
One end of the heat-dissipating wire is crimped together with the circuit wire to the connection terminal, and the other end of the heat-dissipating wire extends in a state separated from the circuit wire, and is connected only to the terminal of the heat-dissipating wire. An insulation tape is formed by winding an insulation tape, and the insulation treatment part is provided with an extension part which is wound around a tape from a position in front of the terminal of the heat radiating wire and extends to a position slightly beyond the terminal. The connection structure of an electric circuit, wherein the portion is folded back to the end of the heat-dissipating electric wire and further wound around and fixed to the end with a tape.

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