JPH0945155A - Bend section forming jig for wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a wire harness having a bend section and suitable for space saving at a low cost. SOLUTION: This bend forming jig 11 for a wire harness is provided with a storage section 12a inserted with an electric wire group 16 wound with a heat shrinkage sheet 17 on the outer periphery. The storage section 12a is bent at the required angle in the longitudinal direction, and heating wires 18, 19 heating the storage section 12a are buried on the inner circumferential side of bend sections 14, 15. The heating wires 18, 19 heat the heat contraction sheet 17 at the shrinkage temperature or above of the heat shrinkage sheet 17 and at the heatproof temperature or below of the electric wires, and the electric wire group is held at the bent state by the shrunk heat shrinkage sheet 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for forming a bent portion of a wire harness, and more particularly to a jig for heating and shrinking a heat-shrinkable sheet wound around a wire group to hold the wire group in a bent state.

[0002]

2. Description of the Related Art A wire harness is bent and arranged in accordance with the shape of the wiring to a vehicle. As a method of bending the wire harness, various directions have been adopted, but mainly, by inserting the wire harness into a protector formed by resin molding in accordance with a required bending shape, by bending the wire harness, It is often held in the required bending state. However, in the method using this protector, there is a problem that it is necessary to provide a dedicated protector corresponding to the bent shape, the number of parts is increased, management is required, and cost is increased.

On the other hand, as shown in FIG. 8, there is a flat wire harness 1 suitable for space saving.
-94211. In the flat wire harness 1, a plurality of circuit bodies 3 formed by punching a copper foil are fixed in parallel with each other with an adhesive on a substrate 2 made of an insulating resin that is three-dimensionally bent. It can be installed in a small installation space.

[0004]

In the conventional example shown in FIG. 8, as the number of circuit bodies 3 increases, the substrate 1
The number of circuit bodies 3 that can be routed on one substrate 2 is limited because the width of the circuit becomes large. Board 2
However, the flat wire harness 1 needs to be constructed by stacking two or three substrates 2. In this way, the structure in which the substrates 2 are superposed has a problem that the processing cost is doubled and tripled, and the manufacturing cost is increased.

Further, as a wire harness to be installed in an automobile, the location of the flat wire harness to be installed is limited, and a wire harness in which a group of electric wires is bound with a tape is usually used. However, conventionally, an effective jig for providing a bent portion in this kind of wire harness has not been provided, and therefore, a simple and inexpensive structure is provided,
Moreover, a jig for forming a bent portion that is easy to operate has been demanded.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a jig having a bent portion and capable of manufacturing a wire harness suitable for space saving at low cost. .

[0007]

To achieve the above object, in the present invention, in claim 1, there is provided an accommodating portion for inserting a wire group having a heat-shrinkable sheet wound around the outer periphery thereof, and the accommodating portion has a longitudinal direction. Is provided with a heating means that bends at a required angle and that heats the housing portion on the inner peripheral side of the bent portion, and the heating means is at a temperature not lower than the contraction temperature of the heat shrinkable sheet and not higher than the heat resistant temperature of the electric wire. (EN) A jig for forming a bent portion of a wire harness, which heats a shrinkable sheet and holds the electric wire group in a bent state by the shrinkable heat-shrinkable sheet.

According to the jig for forming a bent portion of the wire harness of the first aspect of the present invention, when the electric wire group having the heat shrinkable sheet wound around the outer periphery is inserted into the accommodating portion bent at a required angle, The heating means heats the accommodation portion on the inner peripheral side of the bent portion, which partially heats the heat-shrinkable sheet, and the portion of the heat-shrinkable sheet located on the inner peripheral side of the bent portion shrinks to bend the wire group. Held in a state. in this way,
By inserting the wire harness into the jig and operating the heating means attached to the jig, the required bent portion can be easily formed in the wire harness. Further, since the accommodating portion of the jig is formed in a required bent shape, the wire group is inserted into the accommodating portion and heated, so that the bent portion can be accurately bent at a required angle.

According to a second aspect of the present invention, there is provided a jig having a gutter shape as a whole, and the heating means includes a heating wire embedded in the peripheral wall of the accommodating portion on the inner peripheral side of the bent portion. In the above jig, the heating wire embedded in the peripheral wall of the accommodating portion on the inner side of the bent portion heats the inner peripheral side of the bent portion of the heat-shrinkable sheet, so that only the required portion can be rapidly heated, and the work of forming the bent portion can be performed. It is possible to improve efficiency.

According to a third aspect of the present invention, there is provided an electric wire group, which comprises a heating rod erected on an inner peripheral side of a bent portion along a wiring path on a wiring diagram board, wherein a heat-shrinkable sheet is wound around the outer periphery. After wiring while winding around the heating rod, the heating rod is heated by the heating rod at a temperature not lower than the contraction temperature of the heat-shrinkable sheet and not higher than the heat-resistant temperature of the electric wire, and the electric wire group is contracted by the contracted heat-shrinkable sheet. Provided is a jig for forming a bent portion of a wire harness that holds the bent portion.

According to the jig for forming the bent portion of the wire harness of claim 3, when the wire group around which the heat-shrinkable sheet is wound is wound around the heating rod erected on the wiring diagram board, wiring is performed. The heating rod causes the inner peripheral side of the bent portion of the heat-shrinkable sheet to shrink due to heating. Thus, it suffices to stand the heating rod on the wiring diagram board.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the embodiments of the invention shown in the drawings. The bending portion forming jig 11 of the wire harness according to the first embodiment shown in FIG. 1 has a gutter-shaped overall shape, and a jig body 12 bent at a required angle in the length direction, and a jig body 12 And a lid 13 attached to the. In the present embodiment, the jig main body 12 is 2
The heating wire 1 is continuously bent at some points, and the heating wire 1 is attached to the inner circumferential side peripheral walls 14a, 15a of the respective bent parts 14, 15 of the housing 12a.
8 and 19 are buried respectively. Heating wire 18, 19
Is supplied with power from the power supply box 23 via the power supply line 23a.

As shown in FIG. 2, a heat-shrinkable sheet 17 is wound around the wire harness 21 in advance in order to provide bent portions 24 and 25.
The heat-shrinkable sheet 16 is wound around the section where the bent portions 24 and 25 are provided, and the tape 26 is wound around both ends of the heat-shrinkable sheet 17 in the length direction X of the section and fixed to the wire group 16.

The heat-shrinkable sheet 17 is made of polyethylene and has a rectangular wave-shaped cross section as shown in FIGS. 4 (A) and 4 (B). In the heated portion of the heat-shrinkable sheet 17, the groove 17a on both sides is compressed in the lengthwise direction X from the state of FIG. 4 (A) to the state of FIG. 4 (B).
Therefore, the heat-shrinkable sheet 17 is wound around the wire group 16 such that the length direction X of the heat-shrinkable sheet 17 and the length direction of the wire group 16 coincide with each other.

Further, the electric wire group 22 includes less than 10 electric wire groups 22.
3A, the heat-shrinkable sheet 17 having a thickness of 0.1 mm is wound around one and a half turns, and the wire group 16 is composed of 10 or more wires 22 as shown in FIG. 3A. In this case, as shown in FIG. 3B, the heat-shrinkable sheet 17 having a thickness of 0.2 mm is wound twice or more. In this way, when the number of the electric wires 22 forming the electric wire group 16 is increased, it can be dealt with by simply increasing the number of windings of the heat shrinkable sheet 17 accordingly.

Next, the process of forming the bent portions 24 and 25 of the wire harness will be described with reference to FIG. First, FIG.
As shown in (A), the electric wire 22 is inserted into a wiring jig 32 which is erected linearly on the wiring diagram board 31 to perform the wiring work, and the linear shape formed by the wiring work is formed. The heat-shrinkable sheet 17 is wound around the required portion of the electric wire group 16. Then
As shown in FIG. 5B, both ends of the wound heat-shrinkable sheet 17 are fixed with tapes 26.

As shown in FIG. 5C, the portion around which the heat-shrinkable sheet 17 is wound is taken out from the wiring jig 32, and as shown in FIG. It is inserted into the part 12a. In that case, it inserts, making it bend along the bending shape of the accommodating part 12a. After inserting the wire group 16 wound with the heat-shrinkable sheet 17 into the housing portion 12a, the lid 13 is attached to the jig body 12. Then, heating wire 18,
19 is energized to heat the heating wires 18, 19 and the heated electric wires 18, 19 heat the inner peripheral side peripheral walls 14a, 15a of the bent portions 14, 15. As a result, the portions of the heat-shrinkable sheet 17 that are in close contact with the inner peripheral side walls 14a and 15a are heated and contracted, and the wire group 16 is held in a bent state.
The heating temperature is such that the temperature of the heat shrinkable sheet 17 is equal to or higher than the shrinkage temperature and equal to or lower than the heat resistant temperature of the electric wire 22, for example, 80 degrees Celsius
It is adjusted every time.

In the bending portion forming jig 41 of the second embodiment shown in FIGS. 6 and 7, on the wiring diagram board 42,
A plurality of wiring jigs 43 are erected upright along a required wiring route, and at the portion where the wire harness is bent,
The heating rods 44, 45, 46 are erected at positions on the inner peripheral side thereof. Each heating rod 44, 45, 46 has a cylindrical shape,
The electric wire group 16 around which the heat shrinkable sheet 17 is wound is attached to the heating rod 4
The wire group 16 can be bent at a required angle by inserting the wire grouping jig 43 while winding the wire group 4, 45, and 46. After the wire group 16 is laid in this way, the heat-shrinkable sheet 17 is heated by the heating rods 44, 45, 46.

When the heat-shrinkable sheet 17 is heated, the inner peripheral side of the bent portion of the heat-shrinkable sheet 17 contracts, and the contracted heat-shrinkable sheet 17 holds the wire group 16 in a bent shape.

[0020]

As is apparent from the above description, in the jig for forming the bent portion of the wire harness according to claim 1 of the present invention,
The heat shrinkable sheet can be shrunk and the wire group can be held in a desired bent state simply by inserting the wire group around the heat shrinkable sheet into the housing portion of the jig and heating. Since the wire harness formed by using the above jig is kept in a bent state without using a protector as in the conventional case, it is possible to reduce a wiring space for a vehicle.

In the jig for forming a bent portion of a wire harness according to a second aspect of the present invention, the jig is attached to an electric wire on the inner peripheral surface of the bent portion of the accommodating portion.
Since only the inner peripheral side of the bent portion that needs to be contracted is heated, the bent portion of the wire harness can be quickly formed and power consumption can be reduced.

In the third aspect of the present invention, since the jig for forming the bent portion of the wire harness is formed only by the heating rod standing on the wiring diagram board, it is simple and inexpensive. Moreover, since it is sufficient to wire the wire harness while winding it around the heating rod, it is possible to form the bent portion in the wire harness extremely easily.

[Brief description of drawings]

FIG. 1 is a perspective view showing a bending portion forming jig for a wire harness according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a wire harness having a bent portion.

3 is a cross-sectional view taken along the line IV-IV in FIG. 2, where (A) is a view when the wire group is composed of less than 10 wires, and (B) is a wire consisting of 10 or more wires. It is a figure when it has become.

FIG. 4A is an enlarged perspective view of a heat-shrinkable sheet in a non-contracted state, and FIG. 4B is an enlarged perspective view of a contracted state.

5 (A), (B), (C), and (D) are diagrams showing a process of forming a bent portion of a wire harness.

FIG. 6 is a perspective view showing a bending portion forming jig that is a second embodiment of the present invention.

7 is a plan view showing a state in which an electric wire group is laid on the bending portion forming jig shown in FIG.

FIG. 8 is a perspective view showing a conventional wire harness.

[Explanation of symbols]

 11, 41 Wire harness bending jig 12 Jig body 12a Housing portion 13 Lid 16 Electric wire group 17 Heat shrink sheet 18, 19 Heating wire 21 Wire harness 22 Electric wire 24, 24, 47 Bending portion 42 Wiring diagram board 44, 45, 46 heating rod

Claims (3)

[Claims] 1. A housing part for inserting a wire group in which a heat-shrinkable sheet is wound around the outer periphery is inserted, the housing part is bent at a required angle in the length direction, and the housing part is heated on the inner peripheral side of the bent part. Heating means for heating the heat-shrinkable sheet at a temperature not lower than the shrinkage temperature of the heat-shrinkable sheet and not higher than the heat-resistant temperature of the wire, and the bent heat-shrinkable sheet holds the wire group in a bent state. Jig for forming bent part of wire harness. 2. The jig for forming a bent portion of a wire harness according to claim 1, wherein the entire shape is a gutter shape, and a heating wire is embedded in the peripheral wall of the accommodation portion on the inner peripheral side of the bent portion as the heating means. 3. A wire rod comprising a heating rod standing on the inner side of a bent portion along a wiring path on a wiring diagram board, and a wire group having a heat-shrinkable sheet wound around the outer periphery is wound around the heating rod. After wiring while heating the heat-shrinkable sheet with the heating rod at a temperature not lower than the shrinkage temperature of the heat-shrinkable sheet and not higher than the heat-resistant temperature of the wire, the shrinked heat-shrinkable sheet brings the wire group into a bent state. A jig for forming the bent portion of the wire harness to be held.