JP2020035600A - Wire with terminal and manufacturing method thereof - Google Patents

Abstract

To provide a wire with terminal capable of ensuring high anticorrosion property, and to provide a manufacturing method thereof.SOLUTION: In a profile perpendicular to the longitudinal direction substantially in the center of a coated crimp part 9 in the longitudinal direction, the interval of a line E passing the lowermost end of the inside of the coated crimp part 9 and perpendicular to the vertical direction (crimp direction), and a line F passing the uppermost end of the inside of the coated crimp part 9 and perpendicular to the vertical direction (crimp direction) is set equal to the height of the inside of the coated crimp part 9 in the vertical direction. Furthermore, when assuming the center line perpendicular to the vertical direction (crimp direction) at a position of 1/2 of the height C of the inside of the coated crimp part 9 in the vertical direction is G, and the center line G dives the entity vertically into two, the cross sectional area of the gap between a coated conductor 11 and the coated crimp part 9 of the upper part (between the center line G and the straight F of the uppermost part) is smaller than the cross sectional area of the gap between the coated conductor 11 and the coated crimp part 9 of the lower part (between the center line G and the straight E of the lowermost part).SELECTED DRAWING: Figure 3

Description

  The present invention relates to a terminal-equipped electric wire used for, for example, automobiles and the like and a method for manufacturing the same.

  2. Description of the Related Art Conventionally, in the fields of automobiles, office automation equipment, home electric appliances, and the like, electric wires made of a copper-based material having excellent electric conductivity have been used as power lines and signal lines. In particular, in the field of automobiles, high performance and high functionality of vehicles are being rapidly promoted, and various electric devices and control devices mounted on vehicles are increasing. Accordingly, the number of electric wires with terminals used tends to increase accordingly.

  On the other hand, with the focus on environmental issues, there is a demand for lighter vehicles. Therefore, there is a problem of an increase in weight due to an increase in the use amount of the wire harness. For this reason, attention has been paid to lightweight aluminum electric wires in place of conventionally used copper wires.

  Here, a connection terminal is used at the time of connecting such electric wires or at a connection portion of devices or the like. However, even in the case of an electric wire with a terminal using an aluminum electric wire, copper having excellent electric characteristics may be used for the terminal portion in some cases due to the reliability of the connection portion. In such a case, an aluminum electric wire and a copper terminal are used by being joined.

  However, when different metals are brought into contact with each other, so-called electrolytic corrosion may occur due to a difference in the standard electrode potential. In particular, since the standard electrode potential difference between aluminum and copper is large, corrosion of the electrically-noble aluminum side progresses due to the effects of water scattering and dew condensation on the contact portion. For this reason, the connection state between the electric wire and the terminal in the connection portion becomes unstable, and the electric resistance increases due to an increase in the contact resistance and a decrease in the wire diameter. is there.

  For this reason, a method has been proposed in which the connection between the electric wire and the terminal is covered with an anticorrosive material. For example, a terminal-attached electric wire has been proposed in which an anticorrosive material is applied to and coated on a conductive wire or the like exposed between a covered crimping portion and a conductor crimping portion (Patent Document 1).

JP 2017-102998 A

  Normally, in the vicinity of the tip of the covered conductor, the covering portion is removed and the inside conductor is exposed. However, at the boundary between the end portion of the covering portion and the exposed portion of the conductive wire, a minute gap due to a change in the outer diameter is likely to occur. For this reason, in order to secure sufficient anticorrosion properties, it is necessary to allow the anticorrosive material to penetrate into these gaps and harden.

  FIG. 5A is a longitudinal sectional view of the conventional electric wire with terminal 100, and FIG. 5B is a sectional view taken along line XX of FIG. 5A. The terminal and the coated conductor 111 are connected to the terminal-attached electric wire 100. The covered conductor 111 includes a conductor 113 and a covering part 115 covering the conductor 113. At the tip of the covered conductor 111, the covering part 115 is peeled off, and the inside conductor 113 is exposed.

  The terminal includes a conductor crimping portion 107 for crimping the conductor 113 exposed from the covering portion 115 to the distal end side of the sheathing conductor 111, a covering crimping portion 109 for crimping the covering portion 115 of the covering conductor 111, and a conductor crimping portion 107. There is an inter-barrel section 108 between the sections 109.

  An anticorrosion material 117 is applied from the barrel-to-barrel portion 108 to the wire crimping portion 107. As described above, in order to ensure high water stopping performance, the anticorrosive material 117 is made to penetrate into the gap (Z in the figure) between the end of the covering portion 115 and the conductive wire 113 exposed from the covering portion 115. It is desirable to coat.

  However, since the coating and crimping portion 109 is normally pressed in the vertical direction, as shown in FIG. 5B, the coating and crimping portion 109 tends to have a substantially elliptical shape. For this reason, a gap is likely to be formed between the covered conductor 111 and the covered crimp portion 109 on both sides (the direction perpendicular to the crimping direction) of the covered conductor 111.

  When such a gap becomes large, the anticorrosion material 117 applied on the upper part of the inter-barrel portion 108 flows backward along the covered conductor 111 (arrow Y in the drawing), and the anticorrosion material 117 is sufficiently provided below the covered conductor 111. Difficult to spread. As a result, the anticorrosive material 117 does not permeate the gap Z, and water may enter through the gap during use.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a terminal-attached electric wire capable of ensuring high corrosion resistance and a method for manufacturing the same.

  In order to achieve the above-described object, a first invention is a terminal-equipped wire in which a covered conductor and a terminal are connected, wherein the covered conductor includes a covering portion and a conductor exposed from a tip of the covering portion. The terminal has a terminal body and a crimping part, and the crimping part is a conductor crimping part on which the conductor is crimped, a covering crimping part on which the covering part is crimped, and the conductor crimping part. At least a portion where the conducting wire from the inter-barrel portion to the conducting wire crimping portion is exposed is coated with an anticorrosive material, and a longitudinal length of the covering crimping portion. In a cross section perpendicular to the longitudinal direction at the approximate center of the direction, when the upper and lower parts are divided into two by a center line perpendicular to the vertical direction at a position １ ／ of the height in the vertical direction of the inner surface of the coating crimping part, Of the gap between the coated conductor and the coated crimping part at The cross-sectional area of the gap between the covered conductor and the crimped portion below the area is larger than the area, and the total cross-sectional area of the gap between the covered conductor and the crimped portion is 30% to 30% of the cross-sectional area of the covered wire. It is an electric wire with a terminal characterized by being 45%.

  It is desirable that the height of the covered conductor at a substantially center in the longitudinal direction of the covered crimping portion is 87% to 99% of the height of the covered conductor other than the crimping portion.

  It is preferable that both sides in the width direction of the coated lead wire are in contact with the inner surface of the coated compression bonding portion at any position in the longitudinal direction of the coating compression bonding portion.

  According to the first invention, when the upper and lower portions are divided into two by the center line in the height direction of the inner surface of the covered crimping portion, the covered conductor below the cross-sectional area of the gap between the covered conductor and the crimping portion above. Since the cross-sectional area of the gap between the anti-corrosion material and the cover crimping portion is large, the anti-corrosion material is more likely to flow downward when the anti-corrosion material is applied. For this reason, the gap below the covered conductor can be efficiently filled.

  Moreover, since the total cross-sectional area of the gap between the covered conductor and the covered crimping portion is 30% to 45% of the cross-sectional area of the covered conductor, the space between the covered conductor and the covered crimping portion is too large. The outflow is suppressed, and it is also possible to prevent the anticorrosive material from hardly penetrating due to the space between the coated conductor and the coated pressure-bonded portion being too small.

  In addition, if the height of the covered conductor in the covered crimping portion is 87% to 99% of the height of the covered conductor in portions other than the crimping portion, it is possible to suppress breakage or breakage of the covered portion due to excessive collapse of the covered portion. As a result, the covering portion can be securely held by the covering pressure bonding portion.

  Also, by making both sides in the width direction of the insulated wire contact the inner surface of the insulated crimping portion, the insulated wire is biased to one side in the width direction inside the insulated crimping portion, and the gap in the portion becomes excessively large. Too much can be suppressed. As a result, the outflow of the anticorrosion material can be suppressed.

  A second invention is a method for manufacturing a terminal-attached electric wire in which a covered conductor and a terminal are connected, wherein the covered conductor includes a covering portion, and a conductor exposed from a tip of the covering portion, Has a terminal body and a crimping part, the crimping part is a conductor crimping part on which the conductor is crimped, a covering crimping part on which the covering part is crimped, the conductor crimping part and the covering crimping part. And between the barrels between, and at a cross-section perpendicular to the longitudinal direction at substantially the center in the longitudinal direction of the coated crimped portion after crimping, the height of the inner surface of the coated crimped portion in the vertical direction is 1 / When the upper and lower portions are divided into two by a center line perpendicular to the vertical direction at the position 2, the cross-sectional area of the gap between the covered conductor and the covered crimping portion above, the covered conductor and the covered crimping portion below. The cross-sectional area of the gap is large, The sum of the cross-sectional areas of the gaps of the portions is 30% to 45% of the cross-sectional area of the covered conductor, and the anticorrosion material is provided between the barrel, the conductor crimping portion, and the plurality of conductors protruding from the conductor crimping portion. A method for producing a terminal-attached electric wire, characterized in that the method is applied to a portion, left for a predetermined resin penetration time, and then cured.

  According to the second aspect of the present invention, the terminal-equipped electric wire capable of ensuring high anticorrosion performance can be easily manufactured by infiltrating the anticorrosion material into the gap below the covered conductor.

  ADVANTAGE OF THE INVENTION According to this invention, the electric wire with a terminal which can ensure high corrosion resistance and its manufacturing method can be provided.

The perspective view which shows the electric wire 10 with a terminal. Sectional drawing of the electric wire 10 with a terminal. 2A is a partially enlarged view of FIG. 2, and FIG. 2B is a sectional view taken along line AA of FIG. The figure which shows the test method of the electric wire 10 with a terminal. (A) is a partial enlarged sectional view of the conventional electric wire with terminal 100, and (b) is a sectional view taken along line XX of (a).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an electric wire with terminal 10, and FIG. 2 is a sectional view. FIG. 1 is a perspective view of the anticorrosion material 17. The electric wire with terminal 10 is configured by connecting the terminal 1 and the covered conductor 11.

  The covered conductor 11 includes a conductor 13 made of aluminum or an aluminum alloy, and a covering portion 15 covering the conductor 13. That is, the covered conductor 11 includes the covered portion 15 and the conductor 13 exposed from the tip. The conducting wire 13 is, for example, a stranded wire in which a plurality of strands are twisted.

  The terminal 1 is an open barrel type and is made of copper or a copper alloy. The terminal 1 is connected to a covered conductor 11. The terminal 1 is configured by connecting a terminal body 3 and a crimping portion 5 via a transition portion 4. The upper part of the transition part 4 located between the crimping part 5 and the terminal body 3 is open.

  The terminal body 3 is formed by forming a plate-shaped material having a predetermined shape into a tubular body having a rectangular cross section. The terminal body 3 has an elastic contact piece formed by folding a plate-shaped material into a rectangular cylinder inside. The terminal body 3 is connected by inserting a male terminal or the like from the front end. In the following description, an example is shown in which the terminal body 3 is a female terminal that allows insertion of an insertion tab (not shown) such as a male terminal. However, in the present invention, the shape of the details of the terminal body 3 is described. Is not particularly limited. For example, an insertion tab for a male terminal may be provided instead of the female terminal body 3.

  The crimping part 5 is a part to be crimped to the covered conductor 11, and has a barrel shape in which a cross section perpendicular to the longitudinal direction of the terminal 1 is substantially U-shaped before crimping. The crimping part 5 of the terminal 1 includes a conductor crimping part 7 for crimping the conductor 13 exposed from the covering part 15 on the tip end side of the covering conductor 11, a covering crimping part 9 for crimping the covering part 15 of the covering conductor 11, and a conductor crimping part. It consists of an inter-barrel section 8 between the section 7 and the covering crimp section 9.

  Serrations (not shown) are provided in a part of the inner surface of the wire crimping portion 7 in the width direction (direction perpendicular to the longitudinal direction). By forming the serrations in this manner, when the conductor 13 is crimped, the oxide film on the surface of the conductor 13 can be easily broken, and the contact area with the conductor 13 can be increased.

  The covering portion 15 is peeled off from the tip of the covered conductor 11, and the inside conductor 13 is exposed. The covering portion 15 of the covering conductor 11 is crimped by the covering crimping portion 9 of the terminal 1. The conductive wire 13 from which the covering portion 15 is peeled off and exposed is crimped by the conductor crimping portion 7. In the wire crimping portion 7, the wire 13 and the terminal 1 are electrically connected. In addition, the end face of the covering portion 15 is located in the inter-barrel portion 8 between the covering crimping portion 9 and the wire crimping portion 7.

  In the present invention, at least a portion where the conductive wire 13 is exposed from the inter-barrel portion 8 to the conductive wire crimping portion 7 is covered with the anticorrosion material 17. Therefore, the conductive wire 13 is not exposed to the outside by the anticorrosion material 17. The anticorrosion material 17 is not particularly limited. For example, an acrylate-based photocurable resin can be used.

  FIG. 3A is a partially enlarged view of FIG. 2, and FIG. 3B is a cross-sectional view taken along line AA of FIG. 3A. As shown in FIG. 3A, an anticorrosion material 17 is also provided in a gap (B in the drawing) formed by an exposed portion of the conductive wire 13 on the end surface of the coating portion 15 of the coated conductive wire 11.

  The illustrated electric wire with terminal 10 is of an overlap type in which the barrels of the coating and crimping portion 9 are wrapped and crimped so as to overlap each other. When performing the press-bonding operation using the mold, the overlap-type covering press-bonding unit 9 is pressed by overlapping one barrel above the other barrel. Even by applying the anticorrosion material 17 to such an overlap-type covering / compressing portion 9 after the crimping, the anticorrosion property of the covering / compressing portion 9 can be ensured. In addition, the coating | compression-bonding part 9 is not limited to an overlap type | mold, The form which abuts the front-end | tip of a barrel may be sufficient.

  As shown in FIG. 3B, in a cross section perpendicular to the longitudinal direction at a substantially central portion in the longitudinal direction of the coating and crimping portion 9, the vertical direction (the crimping direction) passing through the lowermost end of the inner surface of the coating and crimping portion 9. The distance between the line E and the line F passing through the uppermost end of the inner surface of the coating crimping section 9 and perpendicular to the vertical direction (crimping direction) is defined by the height of the inner surface of the coating crimping section 9 in the vertical direction (C in the figure). And In addition, a center line perpendicular to the vertical direction (crimping direction) at a position (D in the figure) at a half of the vertical height C of the inner surface of the coating and crimping portion 9 is defined as G.

  In this case, when the upper and lower portions are divided into two by the center line G, the cross-sectional area of the gap between the covered conductor 11 and the covered crimping portion 9 above (between the center line G and the uppermost straight line F) is lower than ( The cross-sectional area of the gap between the insulated conductor 11 and the insulated crimp section 9 (between the center line G and the lowermost straight line E) is large. That is, the coating and crimping portion 9 has a substantially trapezoidal shape in which the cross-sectional shape is wider at the lower side. Therefore, the maximum width portion of the coating crimping portion 9 is located below the center line G, and the coating crimping portion 9 below the center line G than the maximum width of the coating crimping portion 9 above the center line G. The maximum width of is widened.

  As shown, the gap between the coated conductor 11 and the coated crimping portion 9 is filled with an anticorrosion material 17. In addition, the anticorrosion material 17 may not be filled in the gap between the covered conductor 11 and the covered crimping section 9 over the entire length of the covered crimping section 9, and at least a part thereof may be covered with the covered conductor 11 and the covered crimping section 9. It is only necessary that the gap between them is closed by the anticorrosion material 17.

  In this way, by reducing the cross-sectional area of the gap between the covered conductor 11 and the covered crimping portion 9 above the center line G, the anticorrosion material 17 is covered from the gap in the process of flowing the anticorrosion material 17 from above to below. The anticorrosion material 17 can be efficiently flowed below the covered wire 11 by suppressing the flow behind the wire 11. In addition, by increasing the cross-sectional area of the gap between the covered conductor 11 and the covered crimping portion 9 below the center line G, more anticorrosive material 17 can flow below the covered conductor 11, and the above-described covered conductor can be used. The gap B below 11 can be filled with the anticorrosion material 17.

  In a cross section perpendicular to the longitudinal direction at a substantially central portion in the longitudinal direction of the coating and crimping portion 9, the total T of the cross-sectional areas of the gaps between the coating conductive wire 11 and the coating and crimping portion 9 is 30% to 30% of the cross-sectional area of the coating conductive wire 11. Desirably, it is 45%. If the total cross-sectional area T is too small, the anticorrosive material 17 will not easily penetrate into the gap, and if the total cross-sectional area T is too large, a large amount of the anticorrosive material 17 will flow into the gap, and the anticorrosive material 17 will not be covered by the coated conductor 11. Will not be supplied sufficiently below the For this reason, the water stoppage is deteriorated.

  As described above, the covered conductor 11 is crimped in the covered crimping section 9. That is, the covered conductor 11 is crushed in the up-down direction by the covered crimping portion 9. Here, in a cross section perpendicular to the longitudinal direction at a substantially central portion in the longitudinal direction of the coating and crimping portion 9, the height of the coated conductor 11 (generally coincident with C in the drawing) is equal to the height of the coating conductor 11 other than the coating and crimping portion 9. It is desirably 87% to 99% of the total.

  If this amount of crushing is too large (if the height of the covered conductor 11 is less than 87% of the height of the covered conductor 11 other than the covered crimping portion 9), the amount of crushing of the covered portion 15 will be too large, and 15 torn or cut. On the other hand, if the crushing amount is too small (the height of the covered conductor 11 is more than 99% of the height of the covered conductor 11 other than the covered crimp portion 9), the crimp amount in the covered crimp portion 9 becomes small, and The conductive wire 11 cannot be held by the covering crimping portion 9.

  Further, it is desirable that both sides in the width direction of the insulated wire 11 contact the inner surface of the insulated crimping portion 9 at any position in the longitudinal direction of the insulated crimping portion 9. In particular, as shown in the figure, it is desirable that both sides in the width direction of the insulated conductor 11 be in contact with the inner surface of the insulated crimp portion 9 in the same cross section. As described above, when the coated conductive wire 11 comes into contact with the inner surface in the width direction of the coated crimping portion 9, the coated conductive wire 11 is biased to one side in the width direction in the coated crimping portion 9, and the gap in the portion becomes excessively large. Too much can be suppressed.

  As described above, in the present embodiment, the size of the gap in the width direction between the insulated conductor 11 and the insulated crimping portion 9 is maximum below the center line G in order from below the insulated crimping portion 9, and the center line G Is minimum (or contact) near. For example, as shown in FIG. 5B, in the conventional coated crimping portion 109, the size of the gap in the width direction between the coated conductor 111 and the coated crimping portion 109 gradually increases from below the coated crimping portion 109. And a substantially elliptical shape having a maximum width near a substantially central portion in the height direction. On the other hand, in the present embodiment, conversely, it has a substantially trapezoidal shape in which the width is large in the lower part and the upper part and the width is narrowest near the center in the height direction. With such a configuration, the amount of the anticorrosion material 17 flowing out along the insulated conductor 11 can be suppressed, and the anticorrosion material 17 can efficiently penetrate below the insulated conductor 11.

  Next, a method of manufacturing the electric wire with terminal 10 will be described. First, the covered conductor 11 and the terminal 1 are connected by crimping. Next, an anticorrosion material 17 is applied to at least a plurality of locations of the barrel-to-barrel portion 8, the conductor crimping portion 7, and the conductor 13 protruding from the conductor crimping portion 7. The anticorrosion material 17 is applied by, for example, a dispenser.

  Next, it is left for a predetermined resin penetration time. The resin penetration time is, for example, 10 seconds or more and 40 seconds or less after the anticorrosion material 17 is applied. By leaving the resin infiltration time, the anticorrosion material 17 can sufficiently penetrate below the covered conductor 11. If the resin permeation time is too short, the anticorrosive material 17 cannot be sufficiently penetrated below the covered conductor 11, and if the resin permeation time is too long, the cycle time becomes long, which is not desirable. Thereafter, the anticorrosion material 17 is cured by light irradiation or the like, whereby the electric wire with terminal 10 is manufactured.

  In the present invention, the application of the anticorrosion material 17 means that the droplets of the anticorrosion material 17 are brought into contact with the target portion, or the droplets of the anticorrosion material 17 are ejected from the supply section (dropped) and adhere to the target portion. The method includes all methods for obtaining a state in which the anticorrosion material 17 is attached to the target portion, such as a method for causing the anticorrosion material 17 to adhere to the target portion. For example, the liquid droplets of the anticorrosion material 17 may be applied to the target portion by bringing the liquid droplets into contact with a mechanical dispenser, or may be applied from a supply portion by a jet dispenser. When the anticorrosion material 17 is made of a material other than the photocurable resin, the anticorrosion material 17 may be hardened by appropriately using a method such as heat.

  As described above, according to the present embodiment, the cross-sectional area of the gap between the insulated conductor 11 and the insulated crimping portion 9 in the insulated crimping portion 9 is larger in the lower part than in the upper part, so that the anticorrosion material is provided. After the application of the coating 17, the anticorrosion material 17 can be efficiently penetrated below the coated conductive wire 11 to fill the gap. For this reason, high water stopping properties can be ensured.

  Further, by setting the ratio of the cross-sectional area of the gap between the coated crimping portion 9 and the coated conductor 11 to the cross-sectional area of the coated conductor 11 in the coated crimping portion 9 within a predetermined range, the anticorrosion material 17 flows out along the coated conductor 11. The amount of the anticorrosion material 17 can be promoted below the coated conductive wire 11 while suppressing the amount of the anticorrosion material 17.

  In addition, by setting the amount of compression of the covered conductor 11 in the covered crimping section 9 within a predetermined range, it is possible to suppress breakage or breakage of the covered section 15 and to securely hold the covered conductor 11 in the covered crimping section 9. be able to.

  In addition, since the both sides of the insulated wire 11 are in contact with the inner surface of the insulated crimp portion 9 in the insulated crimp portion 9, the insulated wire 11 is prevented from being eccentric in the width direction in the insulated crimp portion 9. It is possible to suppress the gap between the pressure bonding portion 9 and the pressure bonding portion 9 from becoming excessively large.

  In addition, by leaving a predetermined resin infiltration time after applying the anticorrosion material 17, the anticorrosion material 17 can be surely permeated below the covered conductor 11, and the gap can be filled.

  An electric wire with a terminal was manufactured under various conditions, and the presence or absence of outflow of the anticorrosive material, the positive pressure sealing property of the electric wire with the terminal, and the presence or absence of a cut in the covering portion in the crimped portion were evaluated. Each of the wires with terminals was evaluated at n = 10, and those that passed all were rated as ○, those that passed 1 to 9 were rated as Δ, and those that passed 0 were rated X. Table 1 shows the results.

  The “gap / covered conductor cross-sectional area ratio” in the table refers to the cross-sectional area of the covered conductor and the cross-sectional area of the gap between the covered conductor and the covered crimped portion (filled with the anticorrosive material) in the cross-section substantially at the center in the longitudinal direction of the covered crimped portion. (Including the part that is shown).

  In the table, “gap: lower cross-sectional area> upper cross-sectional area” refers to the covered conductor and the coated wire above (straight line G to straight line F in FIG. 3 (b)) assuming the center line G shown in FIG. 3 (b). When the cross-sectional area of the gap between the coated conductor and the coated crimping part below (from the straight line G to the straight line E in FIG. 3B) is larger than the cross-sectional area of the gap of the crimping part, did.

  The “ratio of upper and lower wire diameter after crimping” in the table is the ratio of the outer diameter in the vertical direction of the covered conductor in the covered crimping portion after crimping to the outer diameter of the covered conductor before crimping.

  "Outflow of anticorrosion material" in the table means that at the time of production of each coated conductor, after the anticorrosion material was applied and allowed to stand for 10 seconds, it was visually checked whether the anticorrosion material had flowed behind the coated crimping section, and the outflow was observed. Those that were confirmed were rejected.

  In the positive pressure test, air was sent from the coated conductive wire of the terminal-equipped wire toward the terminal, and whether or not air leaked from the rear end was evaluated. FIG. 4 shows an outline of the experimental method. In the experiment, one end (terminal 1) of the electric wire with a terminal was placed in a water tank 21 containing water, and pressurized air was sent from the end of the covered conductor 11 toward the terminal 1 by a regulator 22. The air pressure was 30 kPa.

  In the thermal shock test, each electric wire with a terminal was subjected to 500 cycles of 120 ° C. × 30 minutes to −40 ° C. × 30 minutes. The terminal-equipped electric wire after the thermal shock test was also evaluated for its sealing property under positive pressure. In addition, in the positive pressure test, a sample in which no air leak was observed was regarded as a pass.

  In the table, "Crimping portion covered" indicates whether or not the covering portion was broken in the covered crimping portion, and a portion in which the covering portion was damaged was rejected.

  When the wire diameter was evaluated in the range of 3 sq to 8 sq, any wire diameter having a “gap / covered conductor cross-sectional area ratio” of less than 0.30 was evaluated as Δ in a positive pressure test after thermal shock. This is considered to be due to the fact that, due to the narrow gap, a portion where the anticorrosive material was not sufficiently filled in the gap occurred, and the water stoppage was reduced after the thermal shock test.

  On the other hand, when the "gap / covered conductor cross-sectional area ratio" was more than 0.45, outflow of the anticorrosive material was observed, and as a result, the positive pressure test was evaluated as x.

  In addition, when the “gap lower cross-sectional area> upper cross-sectional area” was ×, outflow of the anticorrosion material was observed, and as a result, the positive pressure test was evaluated as ×.

  Further, when the “ratio of upper and lower electric wires after crimping” was 0.86 or less, it was confirmed that the crimping portion was cut off. Further, when the “ratio of upper and lower electric wires after crimping” is 1.00, the coated crimped portion is not securely held. Therefore, if the “ratio of upper and lower electric wires after crimping” is out of the range of 0.87 to 0.99, there is a possibility that the reliability of the coated crimping portion may be reduced.

  As described above, at least “the upper and lower electric wire diameter ratio after crimping” is 0.3 to 0.45, and the “gap lower cross-sectional area> upper cross-sectional area” is Δ, which can ensure high anticorrosion performance. Was.

  As described above, the embodiments of the present invention have been described with reference to the accompanying drawings. However, the technical scope of the present invention is not affected by the above-described embodiments. It is clear that a person skilled in the art can conceive various changes or modifications within the scope of the technical idea described in the claims, and these naturally fall within the technical scope of the present invention. It is understood to belong.

1 Terminal 3 Terminal body 4 Transition part 5 Crimp part 7 Wire crimp part 8 Barrel part 9 Cover crimp part 10 With terminals Electric wire 11 Insulated conductor 13 Insulated wire 15 Insulated portion 17 Corrosion preventive material 21 Water tank 22 Regulator 100 Electric wire with terminal 107 Conductor crimping portion 108 ... Barrel-to-barrel part 109 .. Coated crimping part 111... Coated conductor 113... Conductor 115... Coated part 117.

Claims (4)

An electric wire with a terminal to which the coated conductor and the terminal are connected,
The coated conductive wire includes a coated portion and a conductive wire exposed from a tip of the coated portion,
The terminal has a terminal body and a crimping part,
The crimping portion includes a conductor crimping portion where the conductor is crimped, a covering crimping portion where the covering portion is crimped, and an inter-barrel portion between the conductor crimping portion and the covering crimping portion,
At least, a portion where the conducting wire is exposed from the inter-barrel portion to the conducting wire crimping portion is covered with an anticorrosive material,
In a cross section perpendicular to the longitudinal direction at a substantially central portion in the longitudinal direction of the coating and crimping portion, a vertical center line perpendicular to the vertical direction at a position １ ／ of the height of the inner surface of the coating and crimping portion in the vertical direction. When divided, the cross-sectional area of the gap between the covered conductor and the covered crimping section is larger than the cross-sectional area of the gap between the covered conductor and the covered crimping section above,
An electric wire with a terminal, wherein a total of a cross-sectional area of a gap between the covered conductor and the covered crimp portion is 30% to 45% of a sectional area of the covered conductor.   The terminal according to claim 1, wherein a height of the covered conductor at a substantially central portion in a longitudinal direction of the covered crimping portion is 87% to 99% of a height of the covered conductor other than the crimping portion. Electrical wire.   The two sides in the width direction of the covered conductor are in contact with the inner surface of the covered crimping part at any position in the longitudinal direction of the covered crimping part, respectively. Wire with terminal. A method for manufacturing a terminal-equipped electric wire in which a coated conductor and a terminal are connected,
The coated conductive wire includes a coated portion and a conductive wire exposed from a tip of the coated portion,
The terminal has a terminal body and a crimping part,
The crimping portion includes a conductor crimping portion where the conductor is crimped, a covering crimping portion where the covering portion is crimped, and an inter-barrel portion between the conductor crimping portion and the covering crimping portion,
In a cross section perpendicular to the longitudinal direction at a substantially central portion in the longitudinal direction of the coated crimping portion after the crimping, at a center line perpendicular to the vertical direction at a position １ ／ of the vertical height of the inner surface of the coated crimping portion. When the upper and lower parts are divided into two, the cross-sectional area of the gap between the covered conductor and the covered crimping section below is larger than the cross-sectional area of the gap between the covered conductor and the covered crimping section above,
The sum of the cross-sectional areas of the gap between the covered conductor and the covered crimping portion is 30% to 45% of the cross-sectional area of the covered conductor,
An anticorrosive material is applied to a plurality of locations of the barrel between the barrel, the conductor crimping portion and the conductor protruding from the conductor crimping portion, and cured after leaving a predetermined resin infiltration time. Production method.

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