JP5117008B2 - Electric wire core water stop treatment structure and electric wire core water stop treatment method - Google Patents

Description

  The present invention relates to a water-stopping structure for a wire core wire and a water-stop treatment method for a wire core wire that shuts off water penetrating into the inside of the wire from a crimp connection portion with a connection terminal of a wire constituting a wire harness or the like.

Conventionally, the water sucked up from the crimping part of the grounding terminal attached outside the wire harness in an automobile has soaked from between the core wires of the electric wire and reaches the connector (connecting part) or auxiliary machine, etc. 10, a structure in which the entire terminal crimping portion 2a of the ground terminal 2 crimped and connected to the end of the electric wire 1 is molded with the resin member 3 as shown in FIG. 10, and the electric wire as shown in FIG. A structure in which the entire terminal crimping portion 2a of the ground terminal 2 connected by crimping to the terminal 1 is covered with a heat-shrinkable heat shrinkable tube 4, and a plurality of wires 1 of the ground circuit are bundled with tape 5 as shown in FIG. The core wires 1a are bundled and welded to form a concentrated joint portion (welded portion) 6. The concentrated joint portion 6 is accommodated in a cap 7 and immersed in a silicone resin 8. A structure in which the terminal crimping portion 2a of the ground terminal 2 is crimped and connected to the end of the core wire 1a of the single electric wire 1 drawn out from the concentrated joint portion 6 (see, for example, Patent Document 1), or as shown in FIG. The insulation coating 1b of the electric wire 1 is stripped over an appropriate length at a position near the ground terminal 2 where the terminal crimping part 2a is crimped and connected to the terminal of the terminal, and the exposed core wire 1a is welded to form a flat plate welded part 9 Thereafter, a structure (for example, see Patent Document 2) or the like covered with a hot-melt heat-shrinkable tube 4 or a tape 10 coated with a silicone resin has been proposed.
Japanese Patent Laying-Open No. 2003-9334 (2 pages, FIG. 1) JP 2004-072943 A (pages 3 to 4, FIGS. 1 and 2)

  However, in the resin mold shown in FIG. 8 described above, a dedicated die is required for each terminal and each wire combination, and the molding time is long and the material cost is high. The structure shown in FIG. 9 requires a uniform mold and jig, which increases the cost and causes many steps to change, resulting in poor workability. The structure shown in FIG. 10 requires a joint part to be made in an earth circuit without a concentrated joint, resulting in an increase in cost. Moreover, when welding each strand of the core wire after intermediate | middle peeling shown in FIG. 11, there are each problems, such as an installation cost becoming high.

  The present invention has been made in view of the above points, and is a water-stopping treatment for a wire core wire that is covered with a hot-melt heat-shrinkable tube after a silicone resin is dropped on the exposed core wire by peeling off the insulation coating of the wire. The object is to provide a method and a water-stop treatment structure for a wire core.

In order to achieve the above object, the water-stopping structure for a wire core according to claim 1 of the present invention is:
When connected to one terminal is middle-peeling the insulating coating of the front of the electric wire crimping connecting crimp-connected wire or connection terminals, to expose only the core wire by stripping over the wire coating of this part all around Then, a water-stopping agent made of a low-viscosity silicone resin is dropped on the exposed portion to allow the water-stopping agent to penetrate into the gaps between the strands of the core wire in the exposed portion, and then a waterproof heat-shrinkable tube containing hot melt in covering the insulating coating of the core wire and the closer end exposed by the middle stripping by heat shrinking of the hot melt-containing waterproof heat shrinkable tube, the hot melt-containing waterproof heat shrinkable tube, the the gap of a large number of element wires together By tightening the core wire portion infiltrated with a water-stopping agent made of a low-viscosity silicone resin, the gaps between many strands of the core wire portion covered with the heat-shrinkable tube are prevented. Is characterized by blocking the water flooded the wire inside from the crimp connection to.

  As for the electric wire, the connection terminal is crimped and connected to the core wire of one end. Alternatively, the connection terminal is connected to the one-side terminal. A desired position of the insulation coating of the electric wire is peeled over an appropriate length to form an intermediate peeled portion to expose the core wire. And a water stop agent is dripped at the arbitrary positions of the exposed core wire. The dropped water-stopping agent penetrates into the gaps between the many strands forming the core wire, fills these gaps, and liquid-tightly blocks both sides of the core wire at the dropped position. Thereby, the water immersion from the connection terminal side of an electric wire to the apparatus side is completely interrupted | blocked, and water is stopped.

After the water-stopping agent is dropped, hot melt enters the intermediate peeled portion, and a heat shrinkable tube is placed on the intermediate peeled portion to cause heat shrinkage so that the entire intermediate peeled portion is liquid-tightly and electrically insulated. As a result, the intermediate peeled portion of the insulation coating of the electric wire is insulated and waterproofed. More specifically, immediately after the water-stopping agent is dropped on the exposed portion of the core wire, the core wire exposed by the intermediate peeling with the hot-shrink heat shrink tube and the insulation coating in the vicinity of both ends are covered to heat the heat-shrink tube with hot melt. By shrinking, the heat-shrinkable tube containing hot melt tightens the core wire covered thereby to waterproof the gaps between the multiple strands of the core wire covered by the heat-shrinkable tube, and from the crimp connection part to the inside of the electric wire Shut off the water soaked in.
In particular, since the water-stopping agent is made of a low-viscosity silicone resin, the low-viscosity silicone resin constituting the water-stopping agent easily penetrates into narrow gaps between a number of strands forming the core wire to fill these gaps. Thereby, the both sides which dripped the low-viscosity silicone resin which comprises a water-stopping agent are interrupted | blocked liquid-tightly, and water stops.
Further, by using a waterproof heat-shrinkable tube as a hot-melt heat-shrinkable tube, the intermediate peeled portion of the insulation coating of the electric wire can be liquid-tightly covered and the core wire can be insulated and waterproofed.

  Moreover, the water-stopping treatment structure for the electric wire core wire according to claim 2 of the present invention is the water-stopping treatment structure for the electric wire core wire according to claim 1, wherein the water-stopping agent is at an arbitrary position of the core wire in the exposed portion. It is characterized by dripping.

  The water-stopping agent can evenly penetrate into the narrow gaps between many strands that form the core wire even if the insulation coating is dropped on any part of the exposed part of the intermediate skin, and can fill these gaps. Can stop water.

Moreover, the water stop processing method of the wire core wire of Claim 3 of this invention is the following.
When connected to one terminal is middle-peeling the insulating coating of the front of the electric wire crimping connecting crimp-connected wire or connection terminals, to expose only the core wire by stripping over the wire coating of this part all around ,
A waterproofing heat containing hot melt is applied after dripping a water-stopping agent made of a low-viscosity silicone resin into the exposed core wire portion so that the water-stopping agent penetrates into the gaps between the strands of the core wire in the exposed portion. covering the insulating coating of the intermediate stripping portion and its neighboring region in shrink tube, the heat shrinkage of the hot melt-containing waterproof heat shrinkable tube, the hot melt-containing waterproof heat shrinkable tube, the the gap of a large number of element wires together By tightening the portion of the core wire infiltrated with a water-stopping agent made of a low-viscosity silicone resin, the gap between many strands of the core wire in this exposed portion is waterproofed, and water that is immersed in the electric wire from the crimp connection portion It is characterized by blocking.

The core wire of an electric wire consists of many strands, and the connection terminal is crimped and fixed to the core wire exposed by peeling off the insulation coating on one end. Alternatively, the connection terminal is connected to the one-side terminal. A desired position of the insulation coating of the electric wire is peeled over an appropriate length to form an intermediate peeled portion to expose the core wire. Next, a water-stopping agent made of a low-viscosity silicone resin is dropped at an arbitrary position on the exposed core wire. The water-stopping agent made of the dropped low-viscosity silicone resin penetrates into the gaps between the many strands, fills these gaps, and liquid-tightly blocks both sides of the core wire at the dropped position. Thereby, the water immersion from the connection terminal side of an electric wire to the apparatus side is completely interrupted | blocked, and water is stopped.

Then, after a water-stopping agent made of a low-viscosity silicone resin is dropped, the intermediate peeled portion is covered with a heat-shrinkable tube containing hot melt and thermally contracted to liquid-tightly and electrically insulate the entire intermediate peeled portion. As a result, the intermediate peeled portion of the insulation coating of the electric wire is insulated and waterproofed.

  According to the present invention, there is no need for a mold for resin molding for each terminal as in the prior art, and even when using a heat-shrinkable tube containing hot melt, each terminal is surely shrunk so as to cover the crimping part. There is no need for a special jig and it is versatile.

In addition, water stop treatment can be performed at any position of the wire, and water stop treatment can be performed at any place when the wire harness is assembled to an actual vehicle. The core wire can be water-stopped. Moreover, even if a water-stopping agent made of a low-viscosity silicone resin is dropped at an arbitrary position of the core wire exposed at the intermediate peeled portion, the water-stopping performance can be obtained, and the workability is improved and the workability is improved.

  In addition, the amount of silicone resin used is small, unlike the case where it is immersed in a silicone resin as a water-stopping agent, and the low-viscosity silicone resin can be permeated into narrow gaps between a number of strands just by dripping. The tact time can be greatly reduced.

Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings. Figure 1 shows a schematic configuration of the implementation form of the water stop processing structure of an electric wire core according to the present invention, the electric connection terminals for example ground the terminal of the electric wire 1 that constitutes a wire harness or the like as shown in FIG. 1 (a) The terminal 12 is connected by crimping. The ground terminal 12 has a circular electric connecting portion 12b having a bolt mounting hole 12a and a flat plate-like substrate portion 12c continuous with the electric connecting portion 12b. The substrate portion 12c has a core wire crimping barrel 12d. Insulating coating crimping barrels 12e are formed so as to protrude from both sides in the width direction.

  The core wire 1a of the electric wire 1 is composed of a large number of strands, the insulation coating 1b at one end is peeled off and exposed, and is crimped and electrically connected to the core wire crimping barrel 12d of the ground terminal 12. The end of the insulating coating 1b is fixed by being crimped to the insulating coating crimping barrel 12e. The other side of the electric wire 1 is connected to a device or the like (not shown). In the crimped connection structure between the electric wire 1 and the ground terminal 12, a desired position of the insulating coating 1b, for example, a position near the ground terminal 12 as shown in FIG. 1B extends over an appropriate length d (for example, about 15 mm). The intermediate peeled portion 1c is peeled off to expose the core wire 1a.

  Next, as shown in FIG. 1C, a silicone resin such as a low viscosity silicone resin 13 as a water-stopping agent (seal member) is dropped at an arbitrary position, for example, a central position, of the core wire 1a exposed to the intermediate peeled portion 1c. The dropped low-viscosity silicone resin 13 penetrates into narrow gaps between a number of strands constituting the core wire 1a, fills the narrow gaps between these strands, and liquid-tightly blocks both sides of the core wire 1a at the dropped position. And stop the water. In addition, in FIG.1 (c), the low-viscosity silicone resin 13 is drawn transparently.

  An example of the low-viscosity silicone resin 13 is manufactured by Shin-Etsu Chemical Co., Ltd. (product name: SJ-KE3420). This low-viscosity silicone resin 13 can be easily penetrated into the gaps between a large number of strands by simply dropping it onto the exposed core wire 1a at a location where the intermediate skin is peeled off using a commercially available liquid metering dispenser. it can.

  Immediately after the low-viscosity silicone resin 13 is dropped, it is covered with a hot-melt heat-shrinkable tube 15 as shown in FIG. 1 (c), and heat-shrinked as shown in FIG. Is liquid-tightly and electrically insulated. In addition, in FIG.1 (c), the hot-melt heat-shrinkable tube 15 is drawn transparently. As a result, the core wire 1a of the electric wire 1 is completely water-stopped on both sides of the intermediate peeled portion 1c, that is, one side where the ground terminal 12 is crimped and the side connected to the device or the like. As a heat-shrinkable tube containing hot melt, for example, there is a waterproof heat-shrinkable tube (product name: ES-1) manufactured by Raychem.

  Next, the water-stopping performance of the water-stopping structure for the above-described electric wire core will be described with reference to examples.

(1) Sample specifications Electric wire: AVSSH 0.5sq, L = 35mm
Silicone resin: Low-viscosity silicone resin (product name: SJ-KE3420) manufactured by Shin-Etsu Chemical Co., Ltd., room temperature viscosity: 0.6 Pa · sec, several drops Hot-melt heat-shrinkable tube: manufactured by Raychem (waterproof heat-shrinkable tube: product name) : ES-1)
(2) Specification Equipment Peeling Machine: Union Peeling Machine Silicone Resin Discharger: General-purpose Solvent Dispenser Hot-melt Tube Heat Shrinker: General-purpose Heat Shrinker (3) Sample Production Procedure Atmosphere 27 ° C, Humidity 40 %, A sample was manufactured according to the following procedure.
(I) As shown in FIG. 2, the intermediate peeled portion 1 c was formed by stripping (striping) the length d (= 8 mm) of the approximate center of the insulating coating 1 b of the electric wire 1 with an intermediate peeler.
(Ii) Low viscosity silicone resin dropping a. The low-viscosity silicone resin 13 was dropped on the entire intermediate peeled portion 1c (FIG. 3).
b. The low-viscosity silicone resin 13 was dropped one by one with the dropping position of the low-viscosity silicone resin as one end (FIG. 4), the center (FIG. 5), and both ends (FIG. 6) of the intermediate peeling portion (strip portion) 1c. In addition, at the time of dripping to one end and both ends, the low-viscosity silicone resin 13 was dripped aiming at a peeling end (strip end) so that it might penetrate | penetrate easily by the narrow clearance gap between many strands of the core wire 1a.
c. Water-stop treatment using hot-melt heat-shrinkable tube After the low-viscosity silicone resin was dropped, the entire intermediate peeled portion 1c was water-stopped with a hot-melt heat-shrinkable tube 15 after a certain time as shown in FIG. The length D of the heat-shrinkable heat shrinkable tube 15 is sufficiently longer than the length d of the intermediate peeled portion (slit portion) 1c (D> d), for example, D = 50 mm. The entire 1c is completely liquid-tightly sealed. In FIG. 7, the heat-shrinkable heat-shrinkable tube 15 is drawn transparently.
(4) Evaluation procedure A seal test was conducted by leaving the sample for one day. In the seal test, the occurrence of bubbles from the other of the samples in which compressed air (MPa) was sent for 30 seconds from one electric wire terminal and submerged was observed to check for leaks.
(5) Evaluation results (i) Table 1 shows the water stopping performance for each standing time after dropping the low viscosity silicone resin. The low-viscosity silicone resin dropping position was the entire intermediate peeled portion (strip portion) 1c. And the water stop performance pass was shown by (circle) and the failure was shown by x (number of samples n = 20 each).

上記結果より、全数とも止水性能が合格であった。
（ii）低粘度シリコーン樹脂滴下位置による止水性能を表２に示す（サンプル数ｎ＝各２０本）。

From the above results, all the water-stopping performances passed.
(Ii) The water-stopping performance at the low-viscosity silicone resin dropping position is shown in Table 2 (number of samples n = 20 for each).

上記結果より、低粘度シリコーン樹脂滴下位置による止水性能の変化は見られず、最悪条件と思われた中間皮剥部（ストリップ部）１ｃの中央部への低粘度シリコーン樹脂を滴下した場合でも止水性能が合格であった。更に１滴程度の低粘度シリコーン樹脂を各位置に滴下しただけで全てのサンプルで止水性能が合格であった。

From the above results, there was no change in the water-stopping performance due to the low-viscosity silicone resin dropping position, and even when the low-viscosity silicone resin was dropped on the central part of the intermediate peeled part (strip part) 1c, which seemed to be the worst condition. The water performance was acceptable. Furthermore, only one drop of low-viscosity silicone resin was dropped at each position, and the water-stopping performance was acceptable for all samples.

  As a result, water-stopping performance could be ensured even after treatment with a heat-shrinkable tube containing hot melt immediately after dropping the low-viscosity silicone resin (about 5 to 10 seconds). In addition, even if the low-viscosity silicone resin is not dropped on the entire intermediate peeled portion (strip portion) 1c, water-stopping performance can be secured only by dropping one drop of the low-viscosity silicone resin on one end or the central portion of the intermediate peeled portion. It became clear.

Figure 8 shows the implementation form of waterproofing treatment method of the wire core related to the present invention, an appropriate length in the longitudinal direction at an arbitrary position of the insulating coating 1b of the wire 1 (for example, about 15 mm) and circumferential The insulating covering portion 1d having a substantially semi-cylindrical shape is cut out along an appropriate length, for example, approximately half a circumference, and an exposed portion 1e opening in a substantially semi-cylindrical shape is formed above. In this case, it is preferable to remove the insulating coating portion 1d so that it can be restored, that is, can be used again on the exposed portion 1e. In the exposed portion 1e, the lower half of the electric wire core 1a is in the substantially semi-cylindrical insulating coating 1b along the circumferential direction, and the upper half is exposed.

  In this state, a low-viscosity silicone resin 13 as a water-stopping agent is dropped at an appropriate position of the wire core wire 1a exposed from the exposed portion 1e, for example, a substantially central position. In the exposed portion 1e, since the lower half is the insulating coating 1b, the dropped low-viscosity silicone resin 13 accumulates in the exposed portion 1e. As a result, the permeability of the low-viscosity silicone resin 13 between the wires of the wire core wire 1a is improved and the amount of dripping can be reduced. Further, in the exposed portion 1e, the electric wire core 1a is covered with the insulating coating 1b in a substantially semi-cylindrical shape in the circumferential direction, so that it is difficult to bend, and workability is improved and quality deterioration due to bending is prevented. The After the low-viscosity silicone resin 13 is dropped and water-stopped, the removed insulation coating portion 1d is joined to the exposed portion 1e and covered again to perform insulation treatment. As a result, the cost of parts for insulation treatment can be reduced.

  FIG. 9 shows a modification of the exposed portion of the insulating coating 1b shown in FIG. 8, and the exposed portion 1g is formed by removing the insulating coating portion 1f so that the insulating coating 1b is scraped off in an arc shape with a plane, for example, to form an exposed portion 1g. A part of is exposed. In this case, it is preferable to remove the insulating covering portion 1f so that it can be restored, that is, can be used again on the exposed portion 1g. And as for the electric wire core wire 1a, the substantially lower half is in the insulation coating 1b along the circumferential direction in the exposed part 1g, and the upper half is exposed. And the low viscosity silicone resin 13 is dripped at the electric wire core wire 1a exposed to the exposed part 1g, and a water stop process is performed. After the low-viscosity silicone resin 13 is dropped and water-stopped, the removed insulation coating portion 1f is joined to the exposed portion 1g and covered again to perform insulation treatment. As a result, the cost of parts for insulation treatment can be reduced.

  8 and 9, the insulation covering portions 1d and 1f removed to form the exposed portions 1e and 1g may be returned to their original state after the water-stopping treatment, and the insulation of the electric wire core may be performed. Alternatively, an insulating member having the same shape as those of the insulating coating portions 1d and 1f may be formed and bonded to the exposed portions 1e and 1g to cover the wire core wire 1a and to insulate the wire core wire. . Moreover, it is good also as a water stop processing structure of the electric wire core which has an exposed part as shown in FIG.8 and FIG.9.

It is an explanatory view of a water stop processing procedure in the water stop processing structure of an electric wire core according to an embodiment of the present invention. It is explanatory drawing of the intermediate | middle peeling part of the insulation coating in the Example of the water stop performance in the water stop processing structure of the electric wire core line of this invention. It is explanatory drawing at the time of dripping a silicone resin to the whole intermediate | middle peeling part of the core wire exposed to the intermediate | middle peeling part shown in FIG. It is explanatory drawing at the time of dripping a silicone resin to the one end of the core wire exposed to the intermediate | middle peeling part shown in FIG. It is explanatory drawing at the time of dripping a silicone resin in the center of the core wire exposed to the intermediate | middle peeling part shown in FIG. It is explanatory drawing at the time of dripping a silicone resin to the both ends of the core wire exposed to the intermediate | middle peeling part shown in FIG. It is explanatory drawing in the case of covering the intermediate | middle peeling part shown in FIG. 2 with a hot-melt heat-shrinkable tube. It is explanatory drawing of the exposed part of the electric wire core wire of insulation coating in the water stop processing method of the electric wire core wire concerning embodiment relevant to this invention. It is explanatory drawing which shows the modification of the exposed part of the electric wire core wire of insulation coating shown in FIG. It is explanatory drawing of the water stop structure which showed an example of the water stop structure of the conventional electric wire, and shape | molded the crimping connection part of an electric wire and a ground terminal with the resin member. It is explanatory drawing of the water stop structure which showed the other example of the water stop structure of the conventional electric wire, and coat | covered the crimping | compression-bonding connection part of an electric wire and an earth terminal with the heat-shrinkable tube containing hot melt. It is explanatory drawing of the water stop structure which showed the other example of the conventional water stop structure of an electric wire, concentrated and welded the core wire of the some electric wire, and was immersed in the silicone resin. It is explanatory drawing of the water stop structure which showed the other example of the conventional water stop structure of an electric wire, welded the core wire which peeled and exposed the intermediate part of the insulation coating of the electric wire, and was coat | covered with the heat-shrinkable tube containing hot melt.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric wire 1a Core wire 1b Insulation coating 1c Intermediate peeling | exfoliation part 1d, 1f Insulation coating | coated part 1e, 1g Exposed part 2 Ground terminal 2a Terminal crimping part 3 Resin member 4 Hot melt containing heat shrinkable tube 5 Tape 6 Concentration joint part (welding part)
7 Cap 8 Silicone resin 9 Welded part 10 Tape 12 Ground terminal (connection terminal)
12a Bolt mounting hole 12b Electrical connection part 12c Substrate part 12d Barrel for crimping core wire 12e Barrel for crimping insulation coating 13 Low viscosity silicone resin 15 Hot melt containing heat shrinkable tube (waterproof heat shrinkable tube)
d Length of intermediate peeled part D Length of heat shrink tube with hot melt

Claims (3)

When connected to one terminal is middle-peeling the insulating coating of the front of the electric wire crimping connecting crimp-connected wire or connection terminals, to expose only the core wire by stripping over the wire coating of this part all around Then, a water-stopping agent made of a low-viscosity silicone resin is dropped on the exposed portion to allow the water-stopping agent to penetrate into the gaps between the strands of the core wire in the exposed portion, and then a waterproof heat-shrinkable tube containing hot melt in covering the insulating coating of the core wire and the closer end exposed by the middle stripping by heat shrinking of the hot melt-containing waterproof heat shrinkable tube, the hot melt-containing waterproof heat shrinkable tube, the the gap of a large number of element wires together By tightening the core wire portion infiltrated with a water-stopping agent made of a low-viscosity silicone resin, the gaps between many strands of the core wire portion covered with the heat-shrinkable tube are prevented. Water stop processing structure of the wire core, characterized in that to block the water flooded the wire inside from the crimp connection to.   The said water stop agent is dripped at the arbitrary positions of the core wire in the said exposed part, The water stop processing structure of the wire core wire of Claim 1 characterized by the above-mentioned. When peeling the insulation coating of the electric wire before the connection terminal is crimped and connected to one end of the wire or the connection terminal by crimping, only the core wire is exposed by stripping the wire coating of this part over the entire circumference,
A waterproofing heat containing hot melt is applied after dripping a water-stopping agent made of a low-viscosity silicone resin into the exposed core wire portion so that the water-stopping agent penetrates into the gaps between the strands of the core wire in the exposed portion. Covering the insulation coating of the intermediate peeled portion and its vicinity region with a shrinkable tube, and the hot melt-containing waterproof heat-shrinkable tube is heated and shrunk so that the hotmelt-containing waterproof heat-shrinkable tube is placed in the gaps between many strands. By tightening the portion of the core wire infiltrated with a water-stopping agent made of a low-viscosity silicone resin, the gap between many strands of the core wire in this exposed portion is waterproofed, and water that is immersed in the electric wire from the crimp connection portion waterproofing treatment method that conductive wire core to said blocking.

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