JP7233229B2 - Electric wire with terminal and its manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a terminal-equipped electric wire for use in automobiles, etc., and a method for manufacturing the same.

2. Description of the Related Art Conventionally, in the fields of automobiles, OA equipment, home electric appliances, and the like, electric wires made of copper-based materials with excellent electrical conductivity have been used as power lines and signal lines. In particular, in the field of automobiles, the performance and functionality of vehicles are rapidly advancing, and the number of various electric devices and control devices to be mounted on vehicles is increasing. Therefore, along with this, the number of electric wires with terminals used tends to increase.

On the other hand, while environmental problems are attracting attention, there is a demand for weight reduction of automobiles. Therefore, an increase in weight due to an increase in the amount of use of the wire harness becomes a problem. For this reason, light weight aluminum wires have attracted attention in place of conventionally used copper wires.

Here, a connection terminal is used when connecting such electric wires or at a connection portion of equipment. However, even in an electric wire with a terminal using an aluminum electric wire, there are cases where copper, which has excellent electrical properties, is used for the terminal portion for the reliability of the connecting portion. In such a case, an aluminum electric wire and a copper terminal are joined and used.

However, when dissimilar metals are brought into contact with each other, so-called electrolytic corrosion may occur due to the difference in standard electrode potential. In particular, since the standard electrode potential difference between aluminum and copper is large, corrosion on the electrically base aluminum side progresses due to the influence of water splashing and condensation on the contact portion. As a result, the connection between the wire and the terminal at the connection part becomes unstable, and there is a risk of an increase in contact resistance, an increase in electrical resistance due to a decrease in wire diameter, and even a disconnection, which may lead to malfunction or stoppage of electrical components. be.

For this reason, methods have been proposed to prevent moisture from entering the connecting portion between the electric wire and the terminal. For example, the crimping part for crimping the coated conductor and the coated part are integrally configured, and one end of the tubular crimping part is sealed to seal the other parts except for the part where the coated conductor is inserted. There is a fixed crimp terminal (see Patent Document 1, for example).

JP 2014-116323 A

When such a terminal-equipped wire is used in an automobile or the like, for example, one end of the terminal-equipped wire is connected to a device inside a high-temperature engine room, and the other end is connected to a relatively low-temperature device outside the engine room. may be connected to That is, a temperature difference may occur between both ends of the terminal-equipped wire.

When a temperature difference occurs in the vicinity of both ends of such a terminal-equipped wire, a pressure difference due to the temperature difference may occur inside the covered conductor. For example, the pressure increases due to air expansion on the high temperature side, and the pressure is relatively low on the low temperature side.

In the above-described conventional electric wire with a terminal, the crimping portion for crimping the conductor of the coated conductor and the covering portion are integrally configured, one end of the tubular crimping portion is sealed, and the covering crimping portion and the covering portion are are in close contact with each other, the penetration of moisture into the terminal is suppressed. However, as described above, if moisture adheres to the vicinity of the terminal in, for example, an engine room while a pressure difference is generated in the coated conductor, the moisture may be sucked into the terminal and enter the interior of the coated conductor. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a terminal-equipped electric wire having excellent water-stopping properties and a method for manufacturing the same.

In order to achieve the above object, a first invention is an electric wire with a terminal to which a covered conductor wire and a terminal are connected, wherein the terminal has a crimping portion to which the covered conductor wire is crimped and a terminal body. The crimping portion is integrally composed of a coated crimping portion to which the coated portion of the coated conductor is crimped, and a conductor crimping portion to which the conductor exposed from the coated portion is crimped, and the coated conductor is inserted. At least the lead wire at the tip of the covering portion is provided with a sealing material that changes from a fluid state to a hardened state after crimping, and the sealing material is sealed. The electric wire with a terminal is characterized in that the conducting wire is exposed from the tip side, and the covered conducting wire is inserted into the crimping portion and crimped.

It is desirable that the compressive strength of the sealing material is greater than the compressive strength of the covering portion.

It is preferable that the crimping portion has an inclined portion between the conductor crimping portion and the covered crimping portion, and the sealing material is arranged on the inclined portion.

The sealing material may include a first resin material that is applied to the outer circumference of the conducting wire and cured.

In this case, it is preferable that the first resin material is arranged in a range of 0.5 mm or more and 10 mm or less from the tip of the covering portion to the tip side of the covered conductor wire.

Further, the first resin material is formed so as to extend from the conductive wire at the tip of the covering portion to the outer periphery of the covering portion, and is 0.5 mm or more from the tip of the covering portion to the rear end side of the crimping portion. It is desirable that it be arranged within a range that does not protrude from the covering crimping portion.

The sealing material may include a second resin material that permeates between the strands of the conducting wire and hardens at the distal end portion of the covering portion.

In this case, it is desirable that the penetration length of the second resin material from the tip of the covering portion into the inside of the covering portion is longer than the penetration length of the second resin material from the tip of the covering portion to the conducting wire side.

The sealing material is composed of a first resin material that is applied to the outer periphery of the conductor and hardened, and a second resin material that penetrates between the strands of the conductor and hardens at the tip of the covering portion. , the first resin material and the second resin material may be different.

The sealing material is an O-ring, the length of the O-ring with respect to the axial direction of the coated conductor is 1 mm or more and 10 mm or less, and the length of the conductor exposed from the O-ring is 1 mm or more and 20 mm or less. good.

According to the first invention, the crimping portion is in a state in which the sealing material is placed on the conductor at the tip of the covering portion with respect to the terminal in which the other portions are sealed except for the portion into which the covered conductor is inserted. Therefore, it is possible to suppress the infiltration of moisture from the tip of the coated portion of the coated conductor into the inside of the coated conductor. Therefore, even if a pressure difference due to a temperature difference occurs inside the covered conductor and the inside of the covered conductor becomes a negative pressure, it is possible to prevent moisture from being sucked into the covered conductor. .

At this time, if the compressive strength of the sealing material is greater than the compressive strength of the covering portion, it is possible to more reliably ensure the water stoppage.

In addition, since the sealing material is disposed on the inclined portion between the lead wire crimping portion and the covering crimping portion, the sealing material can be efficiently pressed against the end surface of the covering portion, and water cutoff can be ensured more reliably. can.

Further, if the sealing material is the first resin material that is applied to the outer periphery of the conducting wire and hardened, the first resin material can stop the water at the front end of the covering portion.

In this case, by arranging the first resin material in a range of 0.5 mm or more and 10 mm or less from the tip of the covering portion to the tip side of the coated conductor wire, it is possible to ensure water cutoff and It is possible to suppress obstruction of conduction with the wire crimping portion.

Similarly, if the first resin material is arranged on the outer periphery of the covering portion, from the front end of the covering portion to the rear end side of the crimping portion by 0.5 mm or more, it does not protrude from the covering crimping portion, It is possible to ensure waterproofness and prevent the resin from protruding to the rear end of the terminal.

In addition, even when the sealing material contains the second resin material that permeates between the strands of the conductor wire and hardens at the tip of the covering portion, the resin can seal between the strands of the covered conductor wire. , the intrusion of water into the coated conductor can be suppressed.

In this case, the penetration length from the tip of the second resin material to the inner side of the covering portion is longer than the length of penetration from the tip of the covering portion of the second resin material to the conducting wire side, thereby ensuring water cutoff. In addition, it is possible to suppress obstruction of conduction between the conductor and the conductor crimping portion.

Further, when both the first resin material applied to the outer periphery of the conductor and hardened and the second resin material permeated between the strands of the conductor and hardened are used as the sealing material, the first resin By using different resins for the material and the second resin material, it is possible to selectively use a resin that easily permeates between the wires and a resin that is easily applied to the outside of the conductor wire, thereby ensuring higher water stoppage.

Also, even if an O-ring is used as the sealing material, the same effect as that obtained by applying resin can be obtained.

A second invention is a method for manufacturing an electric wire with a terminal in which a coated conductor is connected to a terminal, wherein the terminal has a crimping portion to which the coated conductor is crimped and a terminal body, and the crimping portion is integrally composed of a coated crimping part for crimping the coated part of the coated conductor and a conductor crimping part for crimping the conductor exposed from the coated part, except for the part into which the coated conductor is inserted is sealed, a fluid sealing material is placed on the lead wire at the tip of the covering part, and before the sealing material hardens, the covered lead wire is inserted into the crimping part and the lead wire A method of manufacturing an electric wire with a terminal is characterized in that the crimping portion and the coated crimping portion are crimped.

The sealing material is a first resin material having a viscosity of 300 mPa·s or more, and the first resin material is applied to the outer periphery of the conductor wire at the tip of the covering portion, and the covered conductor wire is crimped before curing. you can go

The sealing material is a second resin material having a viscosity of 300 mPa·s or less. Crimping of coated conductors may also be performed.

In this case, after applying the second resin material, the second resin material penetrates into the inside of the covering portion from the tip of the covering portion so that the conducting wire side of the covering conductor is in a high position. The permeation length of the second resin material from the tip of the covering portion to the inside of the covering portion may be longer than the penetration length of the second resin material from the tip of the covering portion to the conducting wire side.

The sealing material is a plurality of types of resin materials, and a second resin material is applied to the conducting wire at the tip of the covering portion to permeate between the wires, and then has a viscosity higher than that of the second resin material. A high first resin material may be applied to the outer periphery of the conductor wire at the tip of the covering portion, and the covered conductor wire may be crimped before the first resin material and the second resin material are cured.

According to the second aspect of the invention, since the sealing material is placed on the conductor wire at the tip of the coated portion and then crimped, the waterproofness can be secured at the tip portion of the coated portion, and the coated conductor is covered from the tip of the coated portion. Intrusion of moisture into the conductor can be suppressed.

Moreover, by using the first resin material having a viscosity of 300 mPa·s or more as the sealing material, it is possible to prevent the first resin material from flowing down when applied to the outer circumference of the conductor. In addition, by crimping the coated conductor wire before curing, it is possible to reliably fill gaps due to the flow of the resin during crimping, thereby enhancing the waterproof property.

In addition, by using the second resin material having a viscosity of 300 mPa·s or less as the sealing material, when the second resin material is applied to the outer periphery of the conductor, the second resin efficiently permeates between the wires. can be made In addition, by crimping the covered conductor wire before curing, the flow of the resin during crimping can reliably fill the gaps between the wires and improve the water stoppage.

Also, in this case, after applying the second resin material, the wire side of the coated conductor is tilted to a higher position, so that the second resin material can efficiently permeate the inside of the coated portion from the tip of the coated portion. be able to. Therefore, the permeation length of the second resin material from the tip of the covering portion to the inner side of the covering portion can be lengthened, and the water stopping property can be improved.

In addition, after the second resin material is applied and penetrated between the wires, the first resin material having a higher viscosity than the second resin material is applied to the outer periphery of the conductor wire, thereby more reliably waterproofing. can increase

ADVANTAGE OF THE INVENTION According to this invention, the electric wire with a terminal excellent in waterproofness, and its manufacturing method can be provided.

The perspective view which shows the electric wire 10 with a terminal. (a) is sectional drawing which shows the electric wire 10 with a terminal, (b) is a J section enlarged view of (a). 4(a) and 4(b) are diagrams showing a step of applying a resin material 29; FIG. FIG. 4 is a diagram showing a method of connecting a terminal 1 and a covered conductor 23; FIG. 4 is a cross-sectional view showing a state in which a crimping portion 5 is arranged between molds 31a and 31b, where (a) is a view before crimping, and (b) is a view after crimping. (a) and (b) are diagrams showing the coating process of the resin material 29a, and (c) is a cross-sectional view taken along line DD of (b). (a) is a diagram showing a state in which resin materials 29 and 29a are applied, and (b) is a cross-sectional view taken along line GG of (a). (a), (b), and (c) are diagrams showing a method of connecting the terminal 1 and the covered conductor 23 using an O-ring 29b.

An embodiment of the first invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an electric wire 10 with a terminal, and FIG. 2(a) is a sectional view. An electric wire 10 with a terminal is configured by connecting a terminal 1 and a coated conductor 23 .

The covered conductor 23 is configured by covering the conductor 25 with an insulating covering 27 . Conductive wire 25 is made of, for example, aluminum or an aluminum alloy. That is, the covered conductor 23 has a covered portion 27 and a conductor 25 exposed from the tip thereof. The conducting wire 25 is, for example, a twisted wire in which a plurality of strands are twisted together.

The terminal 1 is made of copper or a copper alloy, for example, and is composed of a terminal body 3 and a crimping portion 5 to which a coated conductor 23 is crimped. The terminal main body 3 is formed by forming a plate material having a predetermined shape into a cylindrical body having a rectangular cross section. The terminal body 3 has an elastic contact piece 15 formed by folding a plate material into a rectangular cylindrical body at a front end portion 17 . The terminal body 3 is connected by inserting a male terminal or the like from the front end portion 17 .

In the following description, an example in which the terminal body 3 is a female terminal that allows insertion of an insertion tab (not shown) of a male terminal or the like will be shown. is not particularly limited. For example, an insertion tab for a male terminal may be provided in place of the female terminal main body 3, or a bolt fastening portion such as a round terminal may be provided.

The crimping portion 5 is formed by rounding into a cylindrical body having a circular cross section, and by abutting the side edge portions thereof and joining them at the joint portion 21 to integrate them. A coated conductor 23 is inserted from a rear end portion 19 of the crimp portion 5 formed in a cylindrical shape. A sealing portion 11 is provided at the front end portion (on the terminal main body 3 side) of the crimping portion 5 . That is, the crimping portion 5 has a substantially tubular shape with one side closed, and the portion other than the rear end portion 19 into which the coated conductor 23 is inserted is sealed. The joint portion 21 and the sealing portion 11 are joined and sealed by laser welding, brazing, or the like, for example.

The crimping portion 5 includes a covering crimping portion 9 that crimps a covering portion 27 of the covered conductor 23 and a conductor crimping portion 7 that crimps a portion of the covered conductor 23 where the covering is removed and the conductor 25 is exposed. Consists of a single unit. That is, the conductor wire 25 exposed by peeling off the covering portion 27 is crimped by the conductor crimping portion 7, and the conductor wire 25 and the terminal 1 are electrically connected.

A part of the inner surface of the wire crimping portion 7 is provided with serrations (not shown) in the circumferential direction. By forming the serrations in this manner, the oxide film on the surface of the conductor 25 is easily destroyed when the conductor 25 is crimped, and the contact area with the conductor 25 can be increased.

FIG. 2(b) is an enlarged view of part J of FIG. 2(a). In addition, let the resin material 29 be a perspective view in FIG.2(b). As shown in FIG. 2(b), a resin material 29, which is a first resin material, is arranged as a sealing material in the vicinity of the tip of the covered portion 27 of the covered conductor 23. As shown in FIG. The resin material 29 is arranged at least on the outer periphery of the conductor 25 at the tip of the covering part 27 (when the covering part 27 is peeled off). A coated conductor 23 is inserted and crimped. The resin material 29 is desirably arranged over the entire circumference of the tip of the covering portion 27, but it is sufficient if it is arranged at least on the side surface portion and the upper surface portion of the covering portion 27 (below the joint portion 21).

The crimping portion 5 has an inclined portion 8 between the conductor crimping portion 7 and the covering crimping portion 9 . At least part of the resin material 29 is arranged on the inclined portion 8 . That is, the tip of the covering portion 27 is positioned at the inclined portion 8 . In addition, the inclined portion 8 is such that the shape of the inner surface side of the upper portion of the crimping portion 5 in the longitudinal cross section of the electric wire 10 with a terminal is inclined between the substantially linear covering crimping portion 9 and the substantially linear conducting wire crimping portion. It is a part to do.

The compressive strength of the resin material 29 is greater than the compressive strength of the covering portion 27 . For example, the compressive strength of the resin material 29 is desirably 6 MPa or more, more desirably 12 MPa or more. Moreover, it is preferable that the compression set Csg (%) of the resin material 29 is smaller than the compression set Cse (%) of the covering portion 27 (Csg<Cse). Compression set is calculated based on JIS K6262. That is, when the original thickness of the sample is t0, the thickness after compression (thickness of the spacer) is t1, and the thickness of the sample 30 minutes after releasing the compression is t2, the compression set is (t0-t2)/( t0-t1). In addition, the compression set Cs means that the smaller the value, the easier it returns to the original thickness, that is, the larger the return amount after compression. means Here, specifically, the compression set (%) of the sealing material is preferably 30% or less. Furthermore, it is preferable that the compression rate (%) of the resin material 29 is 30% or more and 95% or less, and the compression rate (%) of the covering portion 27 is 50% or more and 90% or less. As the resin material 29, a moisture-curing resin or an anaerobic-curing resin can be used. For example, cyanoacrylate, urethane acrylate, silicon resin, epoxy resin, or the like can be used.

Here, the resin material 29 is a resin material applied to the outer periphery of the conductor 25 and cured. The resin material 29 is arranged in a range of 0.5 mm or more and 10 mm or less (A in FIG. 2B) from the tip of the covering portion 27 to the tip side of the covered conductor 23 . If the range in which the resin material 29 is arranged is too narrow, it will be difficult to ensure sufficient water stopping properties. Moreover, if the range in which the resin material 29 is arranged is too wide, it is not desirable because it hinders conduction with the conductor 25 in the conductor crimping portion 7 . For example, it is desirable that the resin material 29 is arranged only behind the conductor crimping portion 7 .

Moreover, since the resin material 29 only needs to cover the tip portion of the covering portion 27 , it may be arranged on the outer circumference of the conducting wire 25 , but may also be arranged on the outer peripheral surface of the covering portion 27 . That is, the resin material 29 may be arranged on the outer peripheral surface of the coated conductor 23 so as to extend from the conductor 25 to the covering portion 27 . In this case, the resin material 29 is arranged on the outer periphery of the covering portion 27, and is arranged with a distance of 0.5 mm or more from the front end of the covering portion 27 to the rear end portion 19 side of the crimping portion 5 (B in FIG. 2B). is desirable. By doing so, the tip portion of the covering portion 27 can be more reliably covered. In addition, the resin material 29 is arranged in a range (C in FIG. 2B ) so as not to protrude from the rear end portion 19 of the covering pressure-bonding portion 9 .

Next, a method for manufacturing the electric wire with terminal 10 will be described. 3(a) and 3(b) are diagrams showing the process of applying the resin material 29 to the coated conductor 23. FIG. First, as shown in the figure, the covering portion 27 of a predetermined length at the tip of the covered conductor 23 is peeled off to expose the conductor 25 inside. Next, the resin material 29 is arranged over the entire circumference of the conductor wire 25 when the covering portion 27 is stripped.

The resin material 29 is desirably a resin material having a viscosity of 300 mPa·s or more, for example. If the viscosity of the resin material 29 is too low, the resin material 29 will flow down, making it difficult to hold the covered conductor 23 around the conductor 25 .

FIG. 4 is a perspective view showing a state before inserting the coated conductor 23 into the terminal 1. FIG. The wire crimping portion 7 of the terminal 1 before crimping has a smaller outer diameter and inner diameter than the covering crimping portion 9 . In this manner, the diameters of the conductor crimping portion 7 and the covering crimping portion 9 are changed in advance, and the inner diameter of the covering crimping portion 9 for crimping the covering portion 27 having a larger diameter is adjusted to the conductor crimping portion for crimping the conductor wire 25 having a smaller diameter. By making the inner diameter larger than the inner diameter of the portion 7, the amount of compression of the terminal 1 can be reduced.

Next, the coated conductor 23 is inserted into the cylindrical crimping portion 5 . At this time, the resin material 29 is in a state before hardening. When the coated conductor 23 is inserted into the crimping portion 5 , the exposed portion of the conductor 25 is positioned inside the conductor crimping portion 7 , and the covered portion 27 is positioned inside the covering crimping portion 9 . That is, the end surface of the covering portion 27 is positioned between the covering crimping portion 9 and the conductor crimping portion 7 .

FIG. 5(a) is a sectional view showing the molds 31a, 31b, etc. before crimping, and FIG. 5(b) is a sectional view showing the crimping portion 5 during crimping. The mold 31a has a semi-cylindrical cavity extending in the longitudinal direction, and corresponds to the large-diameter portion 34 corresponding to the covering crimping portion 9 and having a radius smaller than the radius of the covering crimping portion 9, and to the conductor crimping portion 7. and a small-diameter portion 32 having a radius smaller than that of the large-diameter portion 34 . The mold 31b has a longitudinally extending semi-cylindrical cavity, and the radii of the portions corresponding to the conductor crimping portion 7 and the coating crimping portion 9 are different from the mold 31a. The large diameter portion 34 is a portion to which the covering crimping portion 9 is crimped, and the small diameter portion 32 is a portion to which the conductor crimping portion 7 is to be crimped.

As shown in FIG. 5B, when the molds 31a and 31b are engaged to compress the crimping portion 5, the conductor crimping portion 7 is crimped to the conductor 25, and the covering crimping portion 9 is crimped to the covering portion 27. be. At this time, the portion where the diameter changes between the conductor crimping portion 7 and the covering crimping portion 9 becomes the inclined portion 8 . Therefore, at least part of the resin material 29 is compressed at the inclined portion 8 .

Then, the electric wire 10 with a terminal is manufactured because the resin material 29 hardens. Since the resin material 29 is a moisture-curing resin or an anaerobic-curing resin as described above, it can be cured by the presence of moisture or the like inside the terminal or by contact with metal. In this manner, after the resin material 29 is applied to the outer periphery of the lead wire 25 at the tip of the covering portion 27, the covered lead wire 23 is crimped before curing, so that the waterproofing of the tip portion of the covering portion 27 can be ensured. can.

As described above, according to the present embodiment, since the resin material 29 is arranged on the outer circumference of the tip portion of the covering portion 27 , it is possible to suppress the infiltration of moisture from the covering portion 27 into the inside of the covering portion 27 . Therefore, even if the inside of the covering portion 27 becomes negative pressure due to the temperature difference between both ends of the covered conductor 23 , the moisture adhering to the rear end portion 19 of the terminal will spread between the covering crimping portion 9 and the covering portion 27 . It is possible to suppress the intrusion of moisture into the coated conductor 23 from the contact portion of the coated conductor 23 .

Also, at this time, since the compressive strength of the resin material 29 is greater than the compressive strength of the covering portion 27, the resin material 29 is more strongly in close contact with the tip of the covering portion 27 (lead wire 25), thereby efficiently ensuring waterproofing. can be done.

In particular, since the resin material 29 is arranged on the inclined portion 8, it receives a force in the inclined direction of the inclined portion 8 (from the conductor crimping portion 7 side to the covering crimping portion 9 direction) during compression. For this reason, the resin material 29 is pressed against the end face of the covering portion 27, and the water cutoff of the end portion of the covering portion 27 can be ensured more reliably.

Moreover, since the resin material 29 has a high viscosity, it can be held without running off when applied to the coated conductor 23 . Therefore, the conductive wire 25 can be inserted into the crimping portion 5 while the resin material 29 is held around the outer periphery of the conductive wire 25 . Moreover, by crimping before the resin material 29 hardens, the resin material 29 can be arranged without gaps in the shape of the crimped portion after crimping. Note that "before the resin material 29 is cured" may be before the resin material 29 is completely cured, and may be in a semi-cured state or the like.

Next, a second embodiment will be described. 6(a) to 6(c) are diagrams showing a step of applying a resin material 29a to the coated conductor wire 23 in the manufacturing method of the electric wire with terminal according to the second embodiment. In the following description, the same reference numerals as those in FIGS. 1 to 5 are given to the same configurations as in the first embodiment, and duplicate descriptions will be omitted.

In this embodiment, the resin material 29a, which is the second resin material, is used as the sealing material. As the resin material 29a, a material having a lower viscosity than the resin material 29 described above can be applied. For example, the resin material 29a can be made of the same type of resin as the resin material 29, but preferably has a viscosity of less than 300 mPa·s. By reducing the viscosity of the resin material 29a, the resin material 29a can efficiently penetrate between the strands of the conducting wire 25. FIG.

As shown in FIG. 6(b), after applying the resin material 29a, the coated conductor 23 is tilted so that the conductor 25 side of the conductor 23 is at a higher position, and the resin material 29a is spread from the tip of the covering section 27 to the covering section 27. You may permeate inside. By doing so, the permeation length of the resin material 29a from the tip of the covering portion 27 to the inside of the covering portion 27 is longer than the permeation length (E in the figure) of the resin material 29a from the tip of the covering portion 27 to the lead wire 25 side. The length (F in the figure) can be lengthened.

It is desirable that the permeation length (E in the drawing) of the resin material 29a from the tip of the covering portion 27 to the lead wire 25 side is 1 mm or more and 10 mm or less. If the permeation length of the resin material 29a toward the conductor wire 25 is too long, the conduction between the strands of the conductor wire 25 is hindered. Moreover, it is desirable that the permeation length (F in the figure) from the tip of the covering portion 27 to the inside of the covering portion 27 is more than 1 mm and 20 mm or less. This is because if the permeation length into the covering portion 27 is too short, it will be difficult to ensure waterproofness, and if it is too long, the flexibility of the covered conductor 23 at the portion protruding from the covering crimping portion 9 will be deteriorated.

FIG. 6(c) is a cross-sectional view taken along line DD of FIG. 6(b). The viscosity of the resin material 29a is low, and by inclining the tip of the coated conductor 23 to a high position after application, the resin material 29a permeates the inside of the covering portion 27, and fills the gaps between the wires and between the covering portion 27 and the wires. The gap can be closed with the resin material 29a.

In this manner, the resin material 29a is applied to the conductor wire 25 at the tip of the covering portion 27 and penetrated between the wires, and the covered conductor wire 23 is crimped before curing, and the resin material 29a is effective, thereby forming an electric wire with a terminal. Obtainable.

According to the second embodiment, effects similar to those of the first embodiment can be obtained. In this way, by stopping the water inside the coated conductor 23 instead of stopping the outer surface of the tip of the coated portion 27, which is the infiltration path of moisture, even if the inside of the coated portion 27 becomes negative pressure. , can suppress the absorption of moisture.

At this time, the permeation length of the resin material 29a from the tip of the covering portion 27 to the inside of the covering portion 27 is longer than the penetration length of the resin material 29a from the tip of the covering portion 27 to the conductor 25 side. Water resistance can be ensured, and obstruction of conduction of the conductor wire 25 in the conductor crimping portion 7 can be suppressed.

Next, a third embodiment will be described. FIG. 7(a) is a diagram showing a state in which resin materials 29 and 29a are applied to the covered conductor 23 in the method for manufacturing an electric wire with a terminal according to the third embodiment, and FIG. It is a cross-sectional view along the line GG of (a).

In this embodiment, resin materials 29 and 29a, which are a plurality of types of resin materials, are used. First, the resin material 29a is applied to the lead wire 25 at the tip of the covering portion 27 and penetrated between the wires. At this time, as described above, the conducting wire 25 may be tilted to a higher position. Thereafter, a resin material 29 having a viscosity higher than that of the resin material 29a is applied to the outer periphery of the lead wire 25 at the tip of the covering portion 27. Then, as shown in FIG.

As shown in FIG. 7(b), in this state, the resin material 29a permeates between the strands of the conductor 25, and the resin material 29 is disposed on the outer periphery of the conductor 25. As shown in FIG. The covered conductor 23 is crimped before the resin materials 29 and 29a are cured, and then the resin materials 29 and 29a are cured to obtain an electric wire with a terminal. As described above, in this embodiment, the sealing material includes the resin material 29 that is applied to the outer periphery of the conductor 25 and hardened, and the resin material that is hardened by permeating between the wires of the conductor 25 at the tip of the covering portion 27. 29a, and the resin material 29 and the resin material 29a are different. Note that the difference between the resin material 29 and the resin material 29a includes the difference due to the difference in viscosity at the time of application even if the resins are of the same type.

According to the third embodiment, effects similar to those of the first embodiment can be obtained. By using the resin materials 29 and 29a in combination in this manner, the water stopping property can be improved more reliably.

Next, a fourth embodiment will be described. 8(a) to 8(c) are diagrams showing a method for manufacturing an electric wire with a terminal according to the fourth embodiment. In this embodiment, the sealing material is the O-ring 29b. As shown in FIG. 8A, an O-ring 29b is arranged on the outer periphery of the conductor 25 at the tip of the covering portion 27. As shown in FIG. In this state, the outer diameter of the O-ring 29b is larger than the outer diameter of the covering portion 27. As shown in FIG.

A groove 33 is formed along the entire circumference of the inner surface between the covering crimping portion 9 and the conductor crimping portion 7 of the crimping portion 5 . The groove 33 is set slightly larger than the inner diameter of the covering crimping portion 9 .

As shown in FIG. 8(b), when the coated conductor 23 is inserted into the crimping portion 5, the O-ring 29b fits into the groove 33 and is positioned. By crimping the covered conductor 23 in this state, a terminal-equipped electric wire can be obtained.

FIG. 8(c) is a cross-sectional view of the crimping portion 5 after crimping. After crimping, the length (I in the drawing) of the O-ring 29b with respect to the axial direction of the covered conductor 23 is 1 mm or more and 10 mm or less, and the length (H in the drawing) of the conductor 25 exposed from the O-ring 29b is 1 mm or more and 20 mm. It is desirable that: If the range of the O-ring 29b is too short, sufficient waterproofness cannot be obtained.

According to the fourth embodiment, effects similar to those of the first embodiment can be obtained. As described above, the O-ring 29b may be used as the sealing material instead of applying the resin materials 29 and 29a. Further, the use of the O-ring 29b and the application (permeation) of the resin material 29a may be used together.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical scope of the present invention is not influenced by the above-described embodiments. It is obvious that a person skilled in the art can conceive various modifications or modifications within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. be understood to belong to

1 Terminal 3 Terminal main body 5 Crimping portion 7 Lead wire crimping portion 8 Inclined portion 9 Insulated crimping portion 10 Wire with terminal 11 Sealing Portion 15 Elastic contact piece 17 Front end portion 19 Rear end portion 21 Joining portion 23 Coated lead wire 25 Lead wire 27 Covered portions 29, 29a Resin material 29b O-rings 31a, 31b Die 32 Small diameter portion 33 Groove 34 Large diameter portion

Claims (15)

An electric wire with a terminal in which a coated conductor and a terminal are connected,
The terminal has a crimping portion to which the coated conductor is crimped and a terminal body,
The crimping portion is integrally composed of a coated crimping portion to which the coated portion of the coated conductor is crimped, and a conductor crimping portion to which the conductor exposed from the coated portion is crimped. Except for the other parts are sealed,
At least, a sealing material that changes from a fluid state to a hardened state after crimping is disposed on the conducting wire at the tip of the covering portion, the conducting wire is exposed from the tip side of the sealing material, and the crimping portion is provided with the sealing material. An electric wire with a terminal, wherein a coated conductor is inserted and crimped. 2. The electric wire with a terminal according to claim 1, wherein the compressive strength of said sealing material is greater than the compressive strength of said covering portion. 3. The crimping portion according to claim 1, wherein the crimping portion has an inclined portion between the conductor crimping portion and the covered crimping portion, and the sealing material is arranged on the inclined portion. wires with terminals. An electric wire with a terminal in which a coated conductor and a terminal are connected,
The terminal has a crimping portion to which the coated conductor is crimped and a terminal body,
The crimping portion is integrally composed of a coated crimping portion to which the coated portion of the coated conductor is crimped, and a conductor crimping portion to which the conductor exposed from the coated portion is crimped. Except for the other parts are sealed,
At least, a sealing material is disposed on the conductor wire at the tip of the covering part, the conductor wire is exposed from the tip side of the sealing material, and the covered conductor wire is inserted into the crimping part and crimped,
The electric wire with a terminal , wherein the sealing material includes a resin material that is applied to the outer circumference of the conductor and hardened. 5. The electric wire with a terminal according to claim 4, wherein the resin material is arranged in a range of 0.5 mm or more and 10 mm or less from the tip of the covering portion to the tip side of the covered conductor. The resin material is formed so as to extend from the conductive wire at the tip of the covering portion to the outer periphery of the covering portion, and is 0.5 mm or more from the tip of the covering portion to the rear end portion side of the crimping portion. 6. The electric wire with a terminal according to claim 4 or 5, wherein the wire is arranged within a range that does not protrude from the covering crimping portion. An electric wire with a terminal in which a coated conductor and a terminal are connected,
The terminal has a crimping portion to which the coated conductor is crimped and a terminal body,
The crimping portion is integrally composed of a coated crimping portion to which the coated portion of the coated conductor is crimped, and a conductor crimping portion to which the conductor exposed from the coated portion is crimped. Except for the other parts are sealed,
At least, a sealing material is disposed on the conductor wire at the tip of the covering part, the conductor wire is exposed from the tip side of the sealing material, and the covered conductor wire is inserted into the crimping part and crimped,
An electric wire with a terminal , wherein the sealing material includes a resin material that permeates between the strands of the conducting wire and hardens at the tip of the covering portion. 8. The permeation length of the resin material from the tip of the covering portion into the inside of the covering portion is longer than the length of permeation of the resin material from the tip of the covering portion to the conducting wire side. Wire with terminals. An electric wire with a terminal in which a coated conductor and a terminal are connected,
The terminal has a crimping portion to which the coated conductor is crimped and a terminal body,
The crimping portion is integrally composed of a coated crimping portion to which the coated portion of the coated conductor is crimped, and a conductor crimping portion to which the conductor exposed from the coated portion is crimped. Except for the other parts are sealed,
At least, a sealing material is disposed on the conductor wire at the tip of the covering part, the conductor wire is exposed from the tip side of the sealing material, and the covered conductor wire is inserted into the crimping part and crimped,
The sealing material is composed of a first resin material that is applied to the outer periphery of the conductor and hardened, and a second resin material that penetrates between the strands of the conductor and hardens at the tip of the covering portion. 1. An electric wire with a terminal, wherein said first resin material and said second resin material are different. An electric wire with a terminal in which a coated conductor and a terminal are connected,
The terminal has a crimping portion to which the coated conductor is crimped and a terminal body,
The crimping portion is integrally composed of a coated crimping portion to which the coated portion of the coated conductor is crimped, and a conductor crimping portion to which the conductor exposed from the coated portion is crimped. Except for the other parts are sealed,
At least, a sealing material is disposed on the conductor wire at the tip of the covering part, the conductor wire is exposed from the tip side of the sealing material, and the covered conductor wire is inserted into the crimping part and crimped,
The sealing member is an O-ring, the length of the O-ring with respect to the axial direction of the covered conductor is 1 mm or more and 10 mm or less, and the length of the conductor exposed from the O-ring is 1 mm or more and 20 mm or less. An electric wire with a terminal characterized by: A method for manufacturing an electric wire with a terminal in which a coated conductor and a terminal are connected,
The terminal has a crimping portion to which the coated conductor is crimped and a terminal body,
The crimping part is integrally composed of a covering crimping part for crimping the covering part of the covered conductor and a conductor crimping part for crimping the conductor exposed from the covering part, except for the part where the covered conductor is inserted, Other parts are sealed,
placing a sealing material with fluidity on the conductor wire at the tip of the covering part;
A method of manufacturing an electric wire with a terminal , wherein the coated conductor wire is inserted into the crimping portion and the conductor crimping portion and the coated crimping portion are crimped together before the sealing material hardens . A method for manufacturing an electric wire with a terminal in which a coated conductor and a terminal are connected,
The terminal has a crimping portion to which the coated conductor is crimped and a terminal body,
The crimping part is integrally composed of a covering crimping part for crimping the covering part of the covered conductor and a conductor crimping part for crimping the conductor exposed from the covering part, except for the part where the covered conductor is inserted, Other parts are sealed,
disposing a sealing material on the conductor wire at the tip of the covering portion;
inserting the covered conductor into the crimping portion and crimping the conductor crimping portion and the covering crimping portion;
The sealing material is a resin material having a viscosity of 300 mPa·s or more, and the resin material is applied to the outer periphery of the conductive wire at the tip of the coating portion, and the coated conductive wire is crimped before curing. A method for manufacturing an electric wire with a terminal . A method for manufacturing an electric wire with a terminal in which a coated conductor and a terminal are connected,
The terminal has a crimping portion to which the coated conductor is crimped and a terminal body,
The crimping part is integrally composed of a covering crimping part for crimping the covering part of the covered conductor and a conductor crimping part for crimping the conductor exposed from the covering part, except for the part where the covered conductor is inserted, Other parts are sealed,
disposing a sealing material on the conductor wire at the tip of the covering portion;
inserting the covered conductor into the crimping portion and crimping the conductor crimping portion and the covering crimping portion;
The sealing material is a resin material having a viscosity of 300 mPa·s or less, and the resin material is applied to the conducting wire at the tip of the covering portion to permeate between the wires, and the covering conducting wire is sealed before curing. A method for manufacturing an electric wire with a terminal, characterized by performing crimping. After applying the resin material, the resin material is allowed to permeate the inside of the covering portion from the tip of the covering portion so that the conducting wire side of the covering conductor is at a high position, 14. The electric wire with a terminal according to claim 13, wherein the permeation length of the grease material from the tip of the covering portion to the inside of the covering portion is longer than the length of permeation of the grease material from the tip of the covering portion to the conducting wire side. manufacturing method. A method for manufacturing an electric wire with a terminal in which a coated conductor and a terminal are connected,
The terminal has a crimping portion to which the coated conductor is crimped and a terminal body,
The crimping part is integrally composed of a covering crimping part for crimping the covering part of the covered conductor and a conductor crimping part for crimping the conductor exposed from the covering part, except for the part where the covered conductor is inserted, Other parts are sealed,
disposing a sealing material on the conductor wire at the tip of the covering portion;
inserting the covered conductor into the crimping portion and crimping the conductor crimping portion and the covering crimping portion;
The sealing material is a plurality of types of resin materials, and a second resin material is applied to the conducting wire at the tip of the covering portion to permeate between the wires, and then has a viscosity higher than that of the second resin material. applying a high first resin material to the outer periphery of the conductor wire at the tip of the covering portion;
A method of manufacturing an electric wire with a terminal, wherein the covered conductor is crimped before the first resin material and the second resin material are cured.

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