JP2017130300A - Wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire harness having a water cut-off structure in which a filler is filled between electric wires without clearance, without performing a work of kneading from the top of a protective material for spreading the filler over space between electric wires.SOLUTION: A wire harness includes: a plurality of covered electric wires 22; a rubber tape protective body 25 in which notches 27 extending in a width direction over the whole width are put in both surfaces of a rubber band plate-like tape material so as to be aligned at a constant pitch in a longitudinal direction of a tape, and around which the notch 27 put in one surface and the other notch 27 put in the other surface are spirally wound by the tapes shifted from each other by a half pitch, by applying tension so as to open the notches 27 and overlapping in the protective range of the electric wire; a tightening fixing part 28 which is fixed by tightening both ends of a rubber tape 26 with an adhesive tape; and a filler 24 which is filled in the external surface of the electric wire and between the electric wires in a state that a silicon material 23 filled in the inside space of the rubber tape protective body 25 and having independent foaming properties is heated and independently foamed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wire harness having a water stop structure.

  In general, in a structure in which an electric wire is passed through a grommet, water easily enters through the electric wire coating. For this reason, it was necessary to fill the gaps between the wire coatings and the gap between the outer peripheral surface of the wire harness and the inner peripheral surface of the grommet.

  Conventionally, various wire harnesses have been proposed to fill these gaps. As one of these conventional wire harnesses, a wire harness shown in FIGS. 6A to 6C is well known. The wire harness shown in FIGS. 6A to 6C is created by the following process.

  First, the some electric wire 22 coat | covered with the insulator is prepared, these electric wires are converged, and the electric wire group 20 is made. Next, after discharging a filler (silicone agent) 64 to the outer surface of the wire group 20 so as to surround the wire group 20 (see FIG. 6A), a protective material (urethane sheet) having a predetermined width and length. 66 is wound in a sushi roll, and the electric wire 22 is protected by the protective material 66 and the filler 64 (see FIG. 6B). Next, both ends of the protective material 66 are wound and fixed by a pair of tightening and fixing portions 68. Next, the operator reciprocates in the length direction of the electric wire group 20 while pressing the outer surface of the protective material 66 with a palm or a finger 70 to pinch the filling material 64, whereby the filler 64 is removed from the electric wire group 20. It is made to adhere to the surface and the filler 64 is filled in the gaps of the electric wires 22 (see FIG. 6C).

  As described above, in the conventional wire harness, the operator reciprocates in the length direction of the electric wire group while pressing the outer surface of the protective material with a palm or a finger, and the filling material is absorbed by the electric wire group. While adhering to the outer surface, the filler was filled in the gaps of the electric wires. However, in the work of gripping with the palms and fingers of the operator, the quality of filling varied. Various countermeasures have been taken against this (for example, see Patent Document 1).

  Patent Document 1 discloses a method for waterproofing a wire harness in which a wire sheet is filled with a water-stopping agent, a flexible sheet is wound from above, and the water-stopping agent is permeated into a gap between the wire groups by pinching the wound portion. Is disclosed. The work of massaging is performed by a waterproof device. Specifically, after pressing the portion around which the flexible sheet is wound from above and below with two pressing plates, the winding portion is rotated, pressed again from above and below, and this is repeated until the wire group is The water-stopper is infiltrated into the gap between the wires.

Japanese Patent Laid-Open No. 11-224541

  However, in the technique described in Patent Document 1, although the operation of squeezing the portion around which the flexible sheet is wound is automated, the squeezing operation itself is necessary, and time and cost for it are still required. It was.

  The present invention has been made in order to solve the above-described problems, and without filling the gap between the wires without carrying out the operation of squeezing from above the protective material for spreading the filler between the wires. An object of the present invention is to provide a wire harness having a filled water stop structure.

  In order to achieve the above object, the wire harness according to the present invention is provided with a plurality of covered electric wires and a rubber band plate-like tape material on both sides of which a cut extending in the width direction so as to cover the entire width is constant in the longitudinal direction of the tape. Tension is applied so that the notches are opened by rubber tape that is inserted in a pitch and that is cut on one side and the notches that are put on the other side are shifted by a half pitch. A rubber tape protector wound in a spiral manner overlapping the protection range of the plurality of covered electric wires, and a pair of fastening fixing portions formed by winding an adhesive tape in a state where both ends of the rubber tape are fastened and fixed, The outer surface of the covered electric wire and the covering in a state where the independent foaming silicon material filled in the inner space of the rubber tape protector is heated and independently foamed It has a filling material filled in between the lines, and configurations with.

  With this configuration, the rubber tape protector can be elastically elongated in the longitudinal direction because the cuts extending in the entire width of the rubber tape are arranged in a staggered pattern on both sides. Since a large amount of elastic elongation can be secured, the silicon material can be independently foamed and expanded by heating in the inner space of the rubber tape protector. At that time, a contraction force (restoring force) is generated in the elastically stretched rubber tape, and the silicon material is pressed inward. Thereby, a filler can be filled without a clearance gap between the outer surface of an electric wire and an electric wire. Therefore, the work for squeezing conventionally to spread the filler between the electric wires becomes unnecessary.

  According to the present invention, there is provided a wire harness having a water stop structure in which a filler is filled with no gap between electric wires without performing an operation of squeezing the filler from above the protective material for spreading between the electric wires. Can do.

The wire harness which concerns on embodiment of this invention is shown, Fig.1 (a) is the schematic side view, FIG.1 (b) is AA sectional drawing of Fig.1 (a). The rubber tape which concerns on this Embodiment is shown, Fig.2 (a) is the top view, FIG.2 (b) is a side view. It is explanatory drawing which shows the manufacturing method of the wire harness which concerns on this Embodiment. It is BB sectional drawing of FIG.3 (b). The rubber tape which concerns on this Embodiment is shown, FIG. 5 (a) is a side view of the rubber tape before winding around an electric wire group, FIG.5 (b) is a side view of the rubber tape in the state wound around the electric wire group, FIG.5 (c) is a side view of the rubber tape after a heating. It is explanatory drawing which shows the preparation method of the water stop structure of the conventional wire harness.

  Hereinafter, embodiments of a wire harness according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the wire harness 10 according to the present embodiment includes a plurality of covered electric wires 22, a rubber tape protector 25, a pair of fastening and fixing portions 28, and a filler 24. Yes. With these components, the wire harness 10 forms a water stop structure so that water does not enter along the gap between the covered electric wires 22.

  An electric wire group 20 is constituted by the plurality of covered electric wires 22. Each of the covered electric wires 22 includes a core wire 22a that is a bundle of copper wires having a small diameter, and an insulating covering material 22b made of polyvinyl chloride (PVC) that covers the core wire 22a. Each core wire 22a may be a single copper wire having a large diameter. The core wire 22a may be an aluminum wire.

  The rubber tape protector 25 is provided with cuts 27 extending in the width direction so as to extend over the entire width on both sides of a rubber band-like tape material, and arranged on a side of the tape at a constant pitch. With the rubber tape 26 in which the cut 27 inserted in the other side and the cut 27 formed on the other surface are shifted from each other by a half pitch, a tension is applied so that the cut 27 is opened and overlaps the protection range of the plurality of covered electric wires 22. It is configured to be spirally wound.

  The rubber tape 26 is a molded article made of, for example, ethylene-propylene-diene rubber (EPDM), silicon rubber, or the like. In order to facilitate the winding operation, an adhesive layer may be formed on the inner surface portion 26 b of the rubber tape 26.

  As shown in FIG. 2, the outer surface portion 26 a and the inner surface portion 26 b of the rubber tape 26 are provided with cuts 27 so as to be arranged at a constant pitch in the longitudinal direction of the rubber tape 26. The constant pitch of the cuts 27 can be set to an arbitrary length according to the desired amount of elongation of the rubber tape 26. When the interval between the cuts 27 is reduced, the assumed extension amount of the rubber tape 26 is increased, and when the interval between the cuts 27 is increased, the extension amount of the rubber tape 26 is reduced.

  In the present embodiment, the cuts 27 are arranged in a staggered pattern so as to be shifted from each other by half a pitch on the outer surface portion 26a and the inner surface portion 26b of the rubber tape 26, but the present invention is not limited to this arrangement. For example, two cuts 27 may be provided in the outer surface portion 26a, and then two cuts 27 may be provided in the inner surface portion 26b. Moreover, according to the curvature of the outer surface of the electric wire group 20, when the expansion amount is different between the outer surface portion 26a and the inner surface portion 26b of the rubber tape 26, for example, two cuts 27 are provided in the outer surface portion 26a, Next, a single notch 27 may be provided in the inner surface portion 26b and arranged in a pattern that repeats thereafter.

  The cut 27 is a cut formed in the outer surface 26a and the inner surface 26b of the rubber tape 26 over the entire length in the width direction, and the cut depth of the cut 27 is smaller than the thickness of the rubber tape 26. About 50%. However, the cut depth of the cut 27 is not limited to this, and can be set to an arbitrary cut depth according to the desired amount of elongation and tensile strength of the rubber tape 26. If the cut depth of the cut 27 is large, the expected extension amount of the rubber tape 26 is large, and if the cut depth of the cut 27 is small, the stretch amount of the rubber tape 26 is small.

  The shape of the cut 27 is a cut (cut) shape formed over the entire length of the rubber tape 26 in the width direction, but the shape is not limited to this. The cuts 27 can have any shape such as a groove shape or a V-shape. From the viewpoint of ease of manufacture, it is preferable to make the cut 27 into a shape that is simply cut.

  The cuts 27 of the present embodiment are formed to extend in the width direction perpendicular to the longitudinal direction of the rubber tape 26, but the direction is not limited to this. The cuts 27 may be formed to extend obliquely in a direction slightly inclined from the width direction.

  No notch is formed in the region between the adjacent cuts 27, but an oblique notch may be formed at a predetermined interval. At this time, the inclination angles of the diagonal notches may be different in the adjacent regions. In this case, the tensile strength of the rubber tape 26 is reduced, but the rubber tape 26 is easily extended in the width direction. Further, the filler 24 can easily move along the notches.

  The pair of tightening and fixing portions 28 is configured by winding an adhesive tape 29 in a state in which both ends of the rubber tape 26 are fastened and fixed. The pair of tightening and fixing portions 28 prevents the filler 24 from spreading beyond the water stop region L (see FIG. 3A) of the covered electric wire 22. Instead of the adhesive tape 29, a binding band may be wound around the both end portions of the rubber tape 26 for binding.

  The filler 24 is filled between the outer surface of the covered electric wire 22 and the covered electric wire 22 in a state in which the independent foaming silicon material 23 filled in the inner space of the rubber tape protector 25 is heated and independently foamed. Yes.

  The filler 24 has an independent foaming property, and a liquid silicon material 23 having appropriate fluidity and viscosity is disposed between the outer surface of the covered wire 22 and the covered wire 22 in the water stop range L of the wire group 20. In the filled state, it is heated, expanded independently and expanded. The filler 24 in the independently foamed state has bubbles inside, but the bubbles are separated by a wall and are not connected, and water cannot enter through the bubbles.

Next, a method for manufacturing the wire harness 10 according to the present embodiment will be described with reference to FIG.
First, an electric wire group 20 including a plurality of covered electric wires 22 is prepared.

  Next, as shown in FIG. 3A, a predetermined amount of the independently foamable silicon material 23 is discharged into the water stop region L of the wire group 20.

  Next, as shown in FIG. 3B, the rubber tape 26 is spirally wound around the protection range including the water stop region L of the wire group 20. At that time, the rubber tape 26 is wound around the electric wire group 20 by, for example, half-wrapping so that the rubber tape 26 overlaps partly in the width direction so that there is no gap between the wound rubber tapes 26. When winding, a tension is applied so that the cut 27 of the rubber tape 26 is opened. A side view of the rubber tape 26 at this time is shown in FIG. As shown in FIG. 5B, the cuts 27 of the outer surface portion 26a and the inner surface portion 26b of the rubber tape 26 are slightly opened in a V shape, and the rubber tape 26 extends in the longitudinal direction.

  4 is a cross-sectional view taken along the line BB in FIG. The rubber tape 26 wound around the four covered electric wires 22 together with the independent foaming silicon material 23 is slightly stretched in the longitudinal direction as shown in FIG. 5B, thereby generating a restoring force (shrinking force). Thereby, the force which presses inward with respect to the covered electric wire 22 and the independent foaming silicon material 23 acts. As a result, the independently foamable silicon material 23 reaches the gaps between the covered electric wires 22.

  Next, as shown in FIG. 3C, the adhesive tape 29 is wound in a state where both ends of the rubber tape 26 wound around the wire group 20 are fastened and fixed.

  Next, the independent foaming silicon material 23 filled in the outer surface of the covered electric wire 22 and the gap between the covered electric wires 22 is heated by a heater such as a dryer via the rubber tape 26 to be independently foamed (FIG. 3). (See (d)). At this time, as shown in FIG. 1, the independently foamed filler 24 expands outward in the radial direction of the wire group 20 while filling the gap between the wires 22.

  In the independently foamed state, as shown in FIG. 1 (b), the rubber tape 26 is wound around the outer peripheral surface of the filler 24 that has been independently foamed and expanded. At this time, as shown in FIG. 5C, the cuts 27 in the outer surface portion 26a and the inner surface portion 26b of the rubber tape 26 are greatly opened in a V shape, and the rubber tape 26 is greatly extended in the longitudinal direction. Due to this large elongation, a larger restoring force (shrinking force) is generated, whereby a larger force acting inwardly acts on the wire group 20 and the independently foamed filler 24. Thus, the independently foamed filler 24 is liquid-tightly filled between the electric wires 22 to form a water stop structure.

Next, functions and effects will be described.
As described above, in the wire harness 10 according to the present embodiment, the cuts 27 extending in the entire width direction of the rubber tape 26 constituting the rubber tape protector 25 are arranged in a staggered pattern on both sides, so that the rubber tape 26 is elongated. It can be elastically extended in the direction. Since a large amount of elastic extension can be secured, the silicon material 23 can be independently foamed and expanded by heating in the inner space of the rubber tape protector 25. At this time, a contraction force (restoring force) is generated in the elastically stretched rubber tape 26 and presses the silicon material 23 inward. Thereby, the filler 24 can be filled without a gap between the outer surface of the covered electric wire 22 and the covered electric wire 22. Therefore, the work of squeezing which has been conventionally performed to spread the filler 24 between the covered electric wires 22 becomes unnecessary.

  The present invention is not limited to the embodiments described above, and the technical scope of the claims includes various design changes within the scope not departing from the gist of the invention.

  The present invention has an effect that it can have a water stop structure in which a filler is filled without a gap between electric wires without performing a work of squeezing from above a protective material for spreading the filler between electric wires. It is useful for all wire harnesses having a water stop structure.

DESCRIPTION OF SYMBOLS 10 Wire harness 22 Covered electric wire 23 Silicone material 24 Filler material 25 Rubber tape protector 26 Rubber tape 27 Cut 28 Tightening fixing part 29 Adhesive tape

Claims (1)

A plurality of coated wires;
Cuts extending in the width direction so as to extend over the entire width of both sides of the rubber band-like tape material are arranged so as to be arranged at a constant pitch in the longitudinal direction of the tape, and the other cuts placed on one surface, A rubber tape that is wound spirally by applying tension so that the cuts are opened and overlapped with a protection range of the plurality of covered electric wires by a rubber tape that is shifted from each other by a half pitch with the cuts made on the surface of A protector,
A pair of fastening and fixing parts formed by winding an adhesive tape in a state where both ends of the rubber tape are fastened and fixed;
And a filler filled between the outer surface of the covered wire and the covered wire in a state where the independent foaming silicon material filled in the inner space of the rubber tape protector is heated and independently foamed. A wire harness characterized by that.

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