JP2021039885A - Terminal with electric wire and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal with an electric wire capable of surely preventing deterioration of water stopping performance and a method for manufacturing the same. SOLUTION: A terminal 1 with an electric wire has an electric wire W, a mating terminal connecting portion 3 and an electric wire connecting portion 5, and the electric wire connecting portion 5 is a terminal for fixing an exposed conductor w1 from which an insulating coating portion w2 is removed. 2, a shrinkable tube 10 that covers the electric wire connecting portion 5 of the terminal 2 and the exposed conductor w1 of the electric wire W, and the outer circumference of the electric wire connecting portion 5 and the exposed conductor w1 of the electric wire W that are filled in the shrinkable tube 10. A damming component that is a separate member from the water blocking agent 20 that covers the outer periphery and the terminal 2, is arranged between the mating terminal connecting portion 3 and the electric wire connecting portion 5 of the contraction tube 10, and is adhered to the water blocking agent 20. It was equipped with 30. [Selection diagram] Fig. 1

Description

The present invention relates to a terminal with an electric wire that stops water at a connection point with a conductor of the electric wire, and a method for manufacturing the terminal.

For example, a terminal with an electric wire (for example, a ground terminal) used in an engine room of a vehicle is expected to be exposed to water. Since there is a risk of corrosion when water is applied to the connection point with the electric wire, a terminal with an electric wire having a water-stop structure has been conventionally proposed.

As shown in FIG. 5, the conventional terminal 100 with an electric wire includes an electric wire W, a terminal 102 to which the electric wire W is connected, a heat-shrinkable tube 110, and a water blocking agent (for example, a hot melt adhesive) 120. ing.

The electric wire W has a conductor w1 and an insulating coating portion w2 that covers the conductor w1. In the electric wire W, the insulating coating portion w2 at the end is stripped off, and the conductor w1 is exposed to the outside. The terminal 102 has a mating terminal connecting portion 103 and an electric wire connecting portion 105. The electric wire connecting portion 105 has an insulating coating fixing portion 106 and a conductor fixing portion 107. The insulation coating portion w2 of the electric wire W is crimped and fixed to the insulation coating fixing portion 106. The conductor w1 exposed from the insulating coating portion w2 is crimped and fixed to the conductor fixing portion 107.

The heat-shrinkable tube 110 covers the outer periphery of the conductor fixing portion 107 of the terminal 102 and the exposed conductor w1 of the electric wire W. The water blocking agent 120 is filled in the heat shrink tube 110.

Next, a method of manufacturing the terminal 100 with an electric wire will be described. First, the insulating coating portion w2 of the electric wire W is crimped and fixed to the insulating coating fixing portion 106 of the terminal 102, and the exposed conductor w1 of the electric wire W is crimped and fixed to the conductor fixing portion 107 of the terminal 102.

Next, as shown in FIG. 6, the jig 140 is set in the terminal 100 with an electric wire. The jig 140 is integrally provided with a weir wall 141. The weir wall 141 is arranged at a position that partitions the mating terminal connecting portion 103 and the electric wire connecting portion 105.

Next, the heat-shrinkable tube 110 that has been passed through the electric wire W in advance is moved to a position that covers the conductor fixing portion 107 of the terminal 102 and the exposed conductor w1 of the electric wire W. A water blocking agent 120 is applied to the inner surface of the heat-shrinkable tube 110.

Next, the heat shrink tube 110 is heated. Then, the heat-shrinkable tube 110 shrinks and the water blocking agent 120 melts. Due to the shrinkage of the heat-shrinkable tube 110, the melted water blocking agent 120 is filled in the heat-shrinkable tube 110. That is, the water blocking agent 120 comes into close contact with the outer periphery of the conductor w1 exposed from the conductor fixing portion 107 of the terminal 102 and the insulating coating portion w2. Further, a part of the melted water blocking agent 120 flows out from the end opening of the heat-shrinkable tube 110 to the mating terminal connection portion 103 side. The water blocking agent 120 that has flowed out is dammed by the damming wall 141. The water blocking agent 120 solidifies as the temperature decreases. Finally, the jig 140 is removed from the terminal 2 (see FIG. 7). This completes.

According to this conventional example, since the water blocking agent 120 does not adhere to the mating terminal connection portion 103, the connection reliability and connection workability with the mating terminal (not shown) are not impaired.

Japanese Unexamined Patent Publication No. 2005-135858

However, according to the conventional example, it is necessary to peel off the damming wall 141 from the water blocking agent 120, and the bottom surface of the water blocking agent 120 may be peeled off from the surface of the terminal 102 due to this peeling force (FIG. FIG. 7 D part). Then, a gap is generated between the bottom surface of the water blocking agent 120 and the surface of the terminal 102. Since this gap serves as an infiltration route for water and the like, there is a problem that the water stopping performance is deteriorated.

The present invention has been made in view of the problems of the prior art. An object of the present invention is to provide a terminal with an electric wire and a method for manufacturing the same, which can surely prevent deterioration of water stopping performance.

The terminal with an electric wire according to the aspect of the present invention has an electric wire having a conductor and an insulating coating portion covering the conductor, a mating terminal connecting portion and an electric wire connecting portion, and the insulating coating portion removes the electric wire connecting portion. A terminal for fixing the exposed conductor, a shrink tube covering the electric wire connection portion of the terminal and the exposed conductor of the electric wire, and an outer circumference of the electric wire connection portion filled in the shrink tube and the outer circumference of the electric wire connection portion. The water blocking agent that covers the outer periphery of the exposed conductor of the electric wire and the terminal are separate members and are arranged between the mating terminal connecting portion and the electric wire connecting portion of the shrink tube, and the water blocking agent. It is equipped with a damming part adhered to.

The shrink tube is a heat shrink tube that shrinks when heat is applied, and the water blocking agent is a hot melt adhesive adhering to the inner peripheral surface of the heat shrink tube before the heat shrink of the heat shrink tube. Is preferable.

The method for manufacturing a terminal with an electric wire according to another aspect of the present invention is performed after the electric wire fixing step of fixing the exposed conductor by removing the insulating coating of the electric wire to the electric wire connecting portion and the electric wire fixing step. After the damming wall arranging step of arranging the damming component between the mating terminal connecting portion and the electric wire connecting portion by a jig and the electric wire fixing step, a tubular shrink tube is attached to the electric wire connecting portion of the terminal. And a tube arranging step of arranging the electric wire at a position covering the exposed conductor, and a stop for filling the shrinkage tube with a molten water blocking agent, which is performed after the damming wall arranging step and the tube arranging step. It includes a liquid agent filling step, and a tube shrinking step that is performed after the damming wall arranging step and the tube arranging step to shrink the shrinking tube.

The shrinkable tube is a heat-shrinkable tube that shrinks when heat is applied, and the water-stopping agent is a hot melt adhesive attached to the inner peripheral surface of the heat-shrinkable tube before the heat-shrinkable. The water-stopping agent filling step and the tube shrinking step are preferably tube heating steps in which heat is applied to the heat-shrinkable tube and the hot melt adhesive.

According to the present invention, since the damming stopper component is not peeled off during the manufacture of the terminal with an electric wire, no gap is generated between the water blocking agent and the terminal. Therefore, it is possible to surely prevent the deterioration of the water stopping performance.

An embodiment of the present invention is shown, where (a) is a plan view of a terminal with an electric wire, (b) is a side view of the terminal with an electric wire, and (c) is a sectional view taken along line Ic-Ic of (a). An embodiment of the present invention is shown, and FIGS. (A) to (C) are sectional views illustrating a manufacturing process of a terminal with an electric wire. It is a perspective view which shows one Embodiment of this invention and shows the state which the jig is set in the terminal with electric wire. An embodiment of the present invention is shown, and shows a state in which a jig is removed from a terminal with an electric wire. Conventional examples are shown, (a) is a plan view of a terminal with an electric wire, (b) is a side view of the terminal with an electric wire, and (c) is a sectional view taken along line Vc-Vc of (a). It is sectional drawing which shows the conventional example and shows the state which the jig is set in the terminal with electric wire. It is a perspective view which shows the conventional example and shows the state which the jig is removed from the terminal with an electric wire.

Hereinafter, the terminal with electric wire and the manufacturing method thereof according to the present embodiment will be described in detail with reference to the drawings. The dimensional ratios in the drawings are exaggerated for convenience of explanation and may differ from the actual ratios.

As shown in FIG. 1, the terminal 1 with an electric wire according to the present embodiment is bonded to the electric wire W, the terminal 2 to which the electric wire W is connected, the heat shrink tube 10 which is a shrink tube, and the hot melt adhesive which is a water blocking agent. The agent 20 and the damming component 30 are provided.

The electric wire W has a conductor w1 in which a large number of strands are twisted and an insulating coating portion w2 that covers the conductor w1. In the electric wire W, the insulating coating portion w2 at the end is stripped off, and the conductor w1 is exposed to the outside.

The terminal 2 is a grounding terminal. The terminal 2 has a mating terminal connecting portion 3 and an electric wire connecting portion 5 integrally provided with the mating terminal connecting portion 3. The mating terminal connection portion 3 has a bolt insertion hole 4. The mating terminal connection portion 3 is fixed to the mating terminal (not shown) by screwing a nut (not shown) into a stat bolt (not shown) inserted into the bolt insertion hole 4.

The electric wire connecting portion 5 has an insulating coating fixing portion 6 and a conductor fixing portion 7. The portion of the insulating coating portion w2 of the electric wire W is crimped and fixed to the insulating coating fixing portion 6. The portion of the conductor w1 exposed from the insulating coating portion w2 is crimped and fixed to the conductor fixing portion 7.

The heat-shrinkable tube 10 covers the conductor w1 (the connection point between the terminal 2 and the conductor w1 of the electric wire W) exposed from the conductor fixing portion 7 of the terminal 2 and the insulating coating portion w2 of the electric wire W. The heat-shrinkable tube 10 has a shape close to the outer shape of the conductor w1 exposed from the conductor fixing portion 7 of the terminal 2 and the insulating coating portion w2 of the electric wire W due to heat shrinkage. The heat-shrinkable tube 10 has a cylindrical shape before heat-shrinking (see FIG. 2C).

The hot melt adhesive 20 is filled in the heat shrinkable tube 10. The hot melt adhesive 20 is in close contact with the outer periphery of the conductor w1 exposed from the conductor fixing portion 7 of the terminal 2 and the insulating coating portion w2, and completely shields these portions from the outside. The hot-melt adhesive 20 was applied to the inner surface of the heat-shrinkable tube 10 before melting, melted by heating, and solidified by a subsequent temperature drop.

The weir member 30 is a flat flat plate. The damming component 30 is located between the mating terminal connecting portion 3 and the electric wire connecting portion 5, and closes the end opening of the heat-shrinkable tube 10 on the mating terminal connecting portion 3 side. The damming component 30 is a separate member from the terminal 2 before heat heating, but is adhered by a hot melt adhesive 20 exposed from the opening of the heat shrink tube 10.

The damming component 30 has a size larger than the end opening of the heat-shrinkable tube 10 before heat-shrinking. The damming component 30 may have a size that can close the end opening of the heat-shrinkable tube 10 before heat-shrinking, and may have the same size as the end opening of the heat-shrinkable tube 10 before heat-shrinking.

The weir member 30 is a material that does not allow water to pass through and does not melt or change its shape when heated to the heat-shrinkable tube 10. The material of the damming component 30 may be plastic, rubber, or metal.

Next, the jig 40 used in the method for manufacturing the terminal 1 with an electric wire will be described. As shown in FIG. 3, the jig 40 has a pair of holding walls 41 erected at intervals. The pair of holding walls 41 are provided with vertical slits 41a at positions facing each other. The weir component 30 can be held by inserting both ends of the weir component 30 into the pair of vertical slits 41a. The weir component 30 held by the pair of vertical slits 41a can be removed by separating from the vertical slits 41a.

Next, a method of manufacturing the terminal 1 with an electric wire according to the present embodiment will be described. First, as shown in FIG. 2A, the insulating coating portion w2 of the electric wire W is crimped and fixed to the insulating coating fixing portion 6 of the terminal 2, and the exposed conductor w1 of the electric wire W is fixed to the conductor fixing portion 7 of the terminal 2. Is crimped and fixed (wire fixing process).

Next, as shown in FIGS. 2B and 3, the weir component 30 is arranged between the mating terminal connection portion 3 of the terminal 2 and the electric wire connection portion 5 by the jig 40 (weir wall arrangement step). ..

Next, as shown in FIG. 2C, the heat-shrinkable tube 10 which has been passed through the electric wire W in advance is moved to a position where it covers the conductor fixing portion 7 of the terminal 2 and the exposed conductor w1 of the electric wire W ( Tube placement process).

Next, the heat-shrinkable tube 10 and the hot-melt adhesive 20 are heated (tube shrinking step, water blocking agent filling step). Then, the heat-shrinkable tube 10 starts shrinking and the hot melt adhesive 20 inside melts. The heat-shrinkable tube 10 tries to shrink into a shape that conforms to the outer shape of the conductor w1 exposed from the conductor fixing portion 7 of the terminal 2 and the insulating coating portion w2 of the electric wire W. The hot melt adhesive 20 tries to flow out from the end opening of the heat shrink tube 10 on the mating terminal connection portion 3 side by receiving the shrinking force of the heat shrink tube 10, but the end opening is closed by the weir component 30. It cannot flow out because it is peeled off. Therefore, the hot melt adhesive 20 is filled in the heat shrink tube 10 (see FIG. 1). As a result, the hot melt adhesive 20 comes into close contact with the outer periphery of the conductor w1 exposed from the conductor fixing portion 7 of the terminal 2 and the insulating coating portion w2, and completely shields these portions from the outside. The hot melt adhesive 20 solidifies as the temperature decreases.

Next, as shown in FIG. 4, the jig 40 is removed from the terminal 2, and the weir component 30 is removed from the jig 40. The damming component 30 is fixed to the terminal 2 by the adhesive force of the hot melt adhesive 20. This completes the manufacturing work.

In the terminal 1 with an electric wire manufactured in this way, since the hot melt adhesive 20 does not adhere to the mating terminal connection portion 3, the connection reliability and connection workability with the mating terminal (not shown) are not impaired.

As described above, the terminal 1 with an electric wire includes an electric wire W, a terminal 2, a heat-shrinkable tube 10, a hot melt adhesive 20, and a weir component 30. The electric wire W has a conductor w1 and an insulating coating portion w2 that covers the conductor w1. The terminal 2 has a mating terminal connecting portion 3 and an electric wire connecting portion 5, and the electric wire connecting portion 5 fixes the exposed conductor w1 from which the insulating coating portion w2 is removed. The heat-shrinkable tube 10 covers the electric wire connecting portion 5 of the terminal 2 and the exposed conductor w1 of the electric wire W. The hot-melt adhesive 20 is filled in the heat-shrinkable tube 10 and the heat-shrinkable tube 10 and covers the outer periphery of the electric wire connecting portion 5 and the outer periphery of the exposed conductor w1 of the electric wire W. The damming component 30 is a member separate from the terminal 2, is arranged between the mating terminal connecting portion 3 and the electric wire connecting portion 5 of the heat shrink tube 10, and is adhered to the hot melt adhesive 20.

Therefore, when the terminal 1 with an electric wire is manufactured, the damming component 30 adhered to the hot melt adhesive 20 is not peeled off, so that a gap due to the peeling of the hot melt adhesive 20 does not occur between the terminals 2. Therefore, it is possible to surely prevent the deterioration of the water stopping performance.

Even if the surface of the terminal 1 with an electric wire is flooded, it is possible to prevent a liquid such as water from entering the connection portion between the electric wire connecting portion 5 of the terminal 2 and the conductor w1 of the electric wire W. In particular, galvanic corrosion that occurs when the conductor w1 of the terminal 2 and the electric wire W is a different metal (for example, the terminal 2 is a copper material and the conductor w1 is an aluminum material) can be prevented.

Here, it is conceivable to provide a weir portion integrally with the terminal 2, but the structure of the terminal 2 becomes complicated.

In this embodiment, the hot-melt adhesive 20 is applied to the inner surface of the heat-shrinkable tube 10 before heat-shrinking, but may not be applied to the inner surface of the heat-shrinkable tube 10. For example, the hot melt adhesive 20 may be injected into the internal space of the heat shrink tube 10 before heating the heat shrink tube 10. In this case, after injecting the hot melt adhesive 20 into the internal space of the heat shrink tube 10, the damming component 30 is arranged at the terminal 2 by the jig 40, and then the heat shrink tube 10 and the hot melt adhesive 20 are placed. Just heat it.

In this embodiment, the electric wire connecting portion 5 has an insulating coating fixing portion 6 that hides the insulating coating portion w2, and a conductor fixing portion 7 that fixes the exposed conductor w1 from which the insulating coating portion w2 is removed. The configuration of the electric wire connecting portion 5 is not limited to this. The electric wire connecting portion 5 may have a configuration in which the insulating coating portion w2 is removed and the exposed conductor w1 is fixed. For example, the electric wire connecting portion 5 may have only the conductor fixing portion 7.

In this embodiment, the shrink tube is a heat shrink tube 10 that shrinks when heat is applied, and the water blocking agent is a hot melt adhesive attached to the inner peripheral surface of the heat shrink tube 10 before the heat shrink. 20. Therefore, by the tube heating step described above, the water blocking agent filling step and the tube shrinking step can be performed at the same time, which simplifies the manufacturing process.

When the water blocking agent filling step and the tube shrinking step cannot be performed at the same time as in the above embodiment, the water blocking agent is filled with the melted water blocking agent in the shrinking tube after the damming wall placement step and the tube placement step. After the filling step and the damming wall arranging step and the tube arranging step, the tube shrinking step of shrinking the shrinking tube may be performed separately.

In this embodiment, the damming component 30 is arranged at a position that closes the end opening of the heat shrink tube 10, but may be arranged at a position away from the end opening of the heat shrink tube 10. That is, the weir component 30 may be arranged at a position where the molten hot melt adhesive 20 can be prevented from flowing out to the mating terminal connection portion 3 side.

However, if the damming component 30 is arranged at a position that closes the end opening of the heat-shrinkable tube 10 as in this embodiment, the end opening of the hot melt adhesive 20 is closed. Then, since the hot-melt adhesive 20 does not flow out of the heat-shrinkable tube 10, the hot-melt adhesive 20 can be reliably filled in the heat-shrinkable tube 10. As a result, the water stopping performance can be further improved.

In the above embodiment, the terminal 2 is a terminal for grounding, but the present invention can be applied to the terminal 2 for any purpose.

In the above embodiment, the conductor fixing portion 7 is fixed by crimping the conductor w1 to the terminal 2, but the conductor fixing portion 7 may be fixed by ultrasonic welding.

In the above embodiment, the heat shrink tube 10 is used as the shrink tube, but the shrink tube may be any one that shrinks by physical or scientific action.

The present embodiment is not limited to these, and various changes can be made within the scope of the gist of the present embodiment.

1 Terminal with electric wire 2 Terminal 3 Mating terminal connection part 5 Electric wire connection part 10 Heat shrink tube (shrink tube)
20 Hot melt adhesive (water stop agent)
30 Weir stop parts 40 Jig W Electric wire w1 Conductor w2 Insulation coating

Claims (4)

An electric wire having a conductor and an insulating coating portion that covers the conductor,
It has a mating terminal connection portion and an electric wire connection portion, and the electric wire connection portion includes a terminal for fixing the conductor exposed by removing the insulating coating portion.
A shrinkable tube that covers the wire connection portion of the terminal and the exposed conductor of the wire.
A water blocking agent that is filled in the shrink tube and covers the outer circumference of the electric wire connection portion and the outer circumference of the exposed conductor of the electric wire.
An electric wire which is a separate member from the terminal and is provided with a weir component which is arranged between the mating terminal connection portion of the shrinkage tube and the electric wire connection portion and is adhered to the water blocking agent. With terminal. The terminal with an electric wire according to claim 1.
The shrink tube is a heat shrink tube that shrinks when heat is applied.
The terminal with an electric wire, wherein the water blocking agent is a hot melt adhesive adhered to the inner peripheral surface of the heat shrinkable tube before the heat shrinkage of the heat shrinkable tube. The wire fixing process of fixing the exposed conductor by removing the insulation coating of the wire at the wire connection part,
A weir wall arranging step, which is performed after the electric wire fixing step and arranges a weir component between the mating terminal connection portion and the electric wire connection portion by a jig
A tube arranging step performed after the wire fixing step, in which a tubular shrink tube is placed at a position covering the wire connection portion of the terminal and the exposed conductor of the wire.
A water blocking agent filling step, which is performed after the weir wall arranging step and the tube arranging step and fills the molten water blocking agent in the shrinkable tube,
A method for manufacturing a terminal with an electric wire, which is performed after the damming wall arranging step and the tube arranging step, and includes a tube shrinking step for shrinking the shrinking tube. The method for manufacturing a terminal with an electric wire according to claim 3.
The shrink tube is a heat shrink tube that shrinks when heat is applied.
The water blocking agent is a hot melt adhesive adhered to the inner peripheral surface of the heat shrinkable tube before the heat shrinkage of the heat shrinkable tube.
A method for manufacturing a terminal with an electric wire, wherein the water blocking agent filling step and the tube shrinking step are tube heating steps for applying heat to the heat shrinking tube and the hot melt adhesive.

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