JP2017103906A - Sheathing tube for wiring harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an electric wire from interfering with an edge of an opening end edge of a resin round tube for sheathing a wiring harness.SOLUTION: A sheathing tube for a wiring harness is made of a resin round tube. A trumpet-shaped diameter-enlarged part is provided at an opening end of the round tube, from which an electric wire of the wire harness for being internally passed is pulled out. Structurally, the electric wire of the wire harness for being inserted through the round tube can be pulled out without interfering with an edge of an end edge of the trumpet-shaped diameter-enlarged part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an outer tube for a wire harness, and in particular, prevents contact between an open terminal of a resin tube used as an outer tube and an electric wire of a wire harness.

In many cases, a wire harness composed of a plurality of electric wires arranged in a vehicle such as an automobile uses a resin round tube or a corrugated tube as an outer tube for the wire harness, and is focused and protected through these tubes.
As the round tube, those made of vinyl chloride resin or cross-linked polyethylene are widely used. The cross-linked polyethylene round tube is more expensive than the vinyl chloride resin round tube, but because it has increased heat resistance and hardness due to cross-linking, the exterior of the wire harness routed in a high temperature atmosphere such as in the engine room It is suitably used as a material.

As shown in FIG. 5 (A), this type of resin round tube is a straight tube of the same diameter continuously extruded, and this resin round tube 100 is used after being cut to a required length. As shown in FIG. 5B, the resin round tube 100 has an inner diameter slightly larger than the outer diameter of the wire harness 110 formed by converging the plurality of electric wires 101, and the electric wires 101 having terminals connected to the terminals. Is inserted through the resin round tube 100 without any backlash, pulled out from the tip opening 100h, and the terminal of the drawn wire terminal is inserted and locked to the connector 120 in many cases.
In addition, the electric wire drawn out from the opening of the terminal of the resin round tube 100 and connected to the connector may be wound with an adhesive tape so that the externally exposed portion does not interfere with the external interference material, but the drawn electric wire is directed toward the connector. In the case of spreading with an inclination, it is difficult to wind the adhesive tape.

When the connector is a large connector having a large number of poles, as shown in FIG. 5C, among the electric wires 101 drawn from the tip opening 100h of the resin round tube 100, the electric wires 101 on both the left and right sides are inclined and widened. Need to be inserted into the terminal accommodating chamber of the connector 120. Therefore, the electric wire 101 inclined to the left and right sides may interfere with the edge 100e of the distal end surface that surrounds the distal end opening 100h of the resin round tube 100, and damage may occur on the outer coating surface of the electric wire 101. In particular, if the resin tube has a high hardness and is made of cross-linked polyethylene, the edge also becomes hard. Therefore, when the electric wire comes into contact with the edge, the insulating coating of the electric wire is easily damaged.
Also, when the terminal 120 of the wire harness 110 is bent from the resin round tube 100 to be connected to a counterpart device or connector, the edge of the open end of the resin round tube 100 and the wire 101 are also used. May interfere with the outer surface of the electric wire 101. In particular, if the resin round tube 100 is made of cross-linked polyethylene having increased strength, damage is likely to occur when the electric wire 101 is in strong contact with the edge of the opening edge.

  Regarding protection of the end of the wire harness, the present applicant disclosed in Japanese Patent Application Laid-Open No. 2014-11824, and as shown in FIG. A protection structure for a wire harness terminal is provided which is provided so as to be bent and cover the terminal of the electric wire 101 and the connector 120 together with the protruding piece 115.

JP 2014-11824 A

  When the structure of Patent Document 1 shown in FIG. 6 is used, interference between the opening edge of the resin round tube 100 and the electric wire can be prevented, and the electric wire is not exposed to the outside until it is connected to the connector, thereby enhancing the protective function of the electric wire. In particular, when the electric wire is a signal wire, there is an advantage that the shield can be protected.

  However, the wire harness terminal protection structure of Patent Document 1 can be used when the wire 101 of the wire harness terminal protected by the resin round tube 100 and the connector 120 connected to the terminal are bent 180 degrees. When the wire harness and the connector drawn out from the terminal are not bent, they are not 180 degrees even if they are bent. In addition, the adhesive tape 160 needs to be held in a state in which the electric wire terminal and the connector are bent together with the protruding piece, so that there is a problem that the work is troublesome.

  This invention is made | formed in view of the said problem, and makes it the subject to provide the exterior tube for wire harnesses which can prevent interference with the edge of an opening edge, and an electric wire.

In order to solve the above problems, the present invention is an outer tube for a wire harness made of a resin round tube,
A trumpet-shaped enlarged portion is provided at the open end of the round tube from which the wire harness wire passing through is drawn out, and the wire harness wire inserted into the round tube interferes with the edge of the trumpet-shaped enlarged portion. Provided is an outer tube for a wire harness that has a structure that can be pulled out without using the wire harness.

  As described above, if a trumpet-shaped enlarged portion is provided in advance at the opening end of the round tube, it can be prevented that the electric wire drawn out from the round tube interferes with the edge of the opening edge even if it is inclined or bent, or Even if the interference occurs, the electric wire can be prevented from interfering with the edge in the orthogonal direction, so that the occurrence of damage to the electric wire due to the interference can be prevented.

Furthermore, the enlarged tip of the trumpet-shaped enlarged portion of the round tube is set to abut against the wire insertion side end surface of the connector connected to the wire of the wire harness,
Alternatively, it is preferable that the enlarged inner surface on the tip side of the trumpet-shaped enlarged diameter portion is set to be brought into contact with the peripheral edge of the end face of the connector on the electric wire connection side and covered on the end of the electric wire connection side of the connector.
The diameter of the trumpet-shaped diameter-enlarged portion can be set according to the inclination angle of the electric wire drawn out from the round tube. For example, the diameter is increased by about 1 to 3 mm.

  As described above, if the trumpet-shaped enlarged portion at the tip of the round tube abuts the connector or covers the wire connection side of the connector, the wire is not exposed to the outside between the tip of the round tube and the connector. Interference with the interference material can be reliably prevented, and in the case of a signal line, shield protection can be achieved.

  The trumpet-shaped widened portion provided at the cut end of the round tube is formed by, for example, covering the tip of a heat-expanded die having a conical shape at the cut end and pushing it into a conical shape while expanding the round tube by heating. .

The round tube is made of a crosslinked polyethylene resin, a vinyl chloride resin, or the like.
That is, it is preferably made of a continuous extrusion molded product of the resin, cut to a length allowing the wire harness to pass, and provided with the trumpet-shaped enlarged portion at the opening at both ends by the conical heating and expanding type after the cutting.

  As described above, if a trumpet-shaped enlarged portion is provided at the tip of the round tube, even if the electric wire drawn out from the round tube spreads outside for connecting the connector, the electric wire is formed at the edge of the open end of the round tube. Can be prevented, and as a result, the occurrence of damage to the electric wire can be prevented, and the degree of freedom in handling the electric wire can be increased.

1 shows a first embodiment of the present invention, (A) is a plan view of a round tube made of resin used as an exterior tube, (B) is an enlarged cross-sectional view of the main part of (A), (C) is a wire to the round tube It is a top view of the state connected with the connector through the harness. It is explanatory drawing of the manufacturing method of the said round tube. (A) is a top view of the state which has connected the wire harness which let the round tube of 2nd Embodiment passed to the connector, (B) is principal part sectional drawing of (A). It is drawing which shows the modification of 2nd Embodiment. (A)-(C) are drawings which show a prior art example. (A) and (B) are drawings showing other conventional examples.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment.

  The outer tube for a wire harness according to the first embodiment includes a round tube 1 made of crosslinked polyethylene, and a trumpet-shaped enlarged portion 2 is provided at one end opening of the round tube 1. The round tube 1 passes through a branch line branched from a trunk line of a wire harness 10 formed by converging a large number of electric wires 11, and an electric wire terminal of the wire harness constituting the branch line is drawn out through a trumpet-shaped enlarged diameter portion 2, and a connector 20 Connected.

  The area of the connector 20 on the wire harness connection side is larger than the cross-sectional area of the round tube 1, and the wires 11 a and 11 b inserted into the cavities 21 a and 21 b on both sides of the cavities (terminal accommodating chambers) 21 of the connector 20 face the connector. Wiring is inclined to expand.

  The angle of inclination of the trumpet-shaped enlarged portion 2 of the round tube 1 is made larger than the angle of inclination of the wires 11a, 11b, and the wires 11a, 11b are connected to the connector 20 without interfering with the tip edge 2e of the trumpet-shaped enlarged portion 2. It is set to let you.

The round tube 1 is manufactured by continuously extruding a round tube with a resin and then cutting it into a required length corresponding to the outer length of the wire harness. Then, as shown in FIG. Put both ends of the round tube (if both wires are pulled out from the ends of the round tube) on the tip of the conical heating expansion diameter mold 40, and soften and expand the round tube 1 by heating and push it into the conical shape. A diameter portion 2 is formed. In the present embodiment, the diameter of the large-diameter end 2c at the tip is about 2 mm larger than the small-diameter end 2b of the trumpet-shaped enlarged diameter portion 2.
In addition, the shape of the trumpet-shaped enlarged diameter part 2 is changed according to the expansion of the electric wire group of a wire harness by changing the conical shape of the heating enlarged diameter type 40.

  The branch wire 11 of the wire harness 10 that passes through the round tube 1 passes through the round tube 1 from the opening of the round tube 1 where the trumpet-shaped enlarged portion 2 is not provided, and the trumpet-shaped enlarged portion 2 at the other end. Pull out more. At the time of insertion into the round tube 1, only a terminal is connected to the end of the electric wire 11, and the connector 20 is not connected because it does not pass through the inside of the round tube 1. The terminal of the end of the electric wire 11 drawn out from the trumpet-shaped enlarged portion 2 of the round tube 1 is inserted and locked into the cavity 21 of the connector 20. At that time, the electric wires 11a and 11b inserted and locked in the cavities 21a and 21 on both sides are inclined in the expanding direction, but do not interfere with the edge 2e of the trumpet-shaped enlarged diameter portion 2.

FIG. 3 shows a second embodiment.
The round tube 1-B of the second embodiment is made of vinyl chloride resin, and the trumpet-shaped enlarged portion 2 provided in the wire lead-out opening is longer than that of the first embodiment, and the electric wire is drawn from the trumpet-shaped enlarged portion 2. The outer diameter surface of the connector 20 connected to the terminal 11 on the wire connection side is covered with the large-diameter end 2c side of the trumpet-shaped enlarged diameter portion 2.

  That is, the length L3 of the trumpet-shaped enlarged diameter portion 2 is made longer than the length L4 of the electric wire 11 from the base end until it is connected to the connector. And the connector 20 which can cover the front end side of the trumpet-shaped enlarged portion 2 is relatively small, and the area of the large-diameter end 2c of the trumpet-shaped enlarged portion 2 is 1.3 times or more of the area of the small-diameter end 2b. Yes.

  As shown in FIG. 3B, the inner surface of the trumpet-shaped enlarged diameter portion 2 is in contact with the outer periphery 20g of the end surface 20s of the electric wire insertion side of the connector 20 at the intermediate position in the length direction. Thereby, intrusion of dust and foreign matter into the connector 20 can be prevented.

  As shown in FIG. 4, the large-diameter end 2 c of the trumpet-shaped enlarged diameter portion 2 may abut against the outer peripheral frame 20 j of the electric wire insertion side end surface 20 s of the connector 20.

DESCRIPTION OF SYMBOLS 1 Round tube 2 Trumpet-shaped enlarged diameter part 10 Wire harness 11 Electric wire 20 Connector

Claims (3)

It is an outer tube for a wire harness made of a resin round tube,
A trumpet-shaped enlarged portion is provided at the open end of the round tube from which the wire harness wire passing through is drawn out, and the wire harness wire inserted into the round tube interferes with the edge of the trumpet-shaped enlarged portion. An outer tube for a wire harness that is designed to be pulled out without being damaged. The setting is made to abut the expanded tip of the trumpet-shaped enlarged portion of the round tube against the wire insertion side end surface of the connector to be connected to the wire of the wire harness,
The wire according to claim 1, wherein an inner surface of the enlarged distal end side of the trumpet-shaped enlarged diameter portion is set to be brought into contact with a peripheral edge of an end surface of the connector on the electric wire connection side so as to cover the electric wire connection side end of the connector. Exterior tube for harness.   The outer tube for a wire harness according to claim 1 or 2, wherein the round tube is made of a crosslinked polyethylene resin or a vinyl chloride resin.

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