JPH06111643A - Method for fixing shape of wire harness - Google Patents

Abstract

PURPOSE:To prevent the thickening of a wire harness, and improve the workability, and reduce the cost in a method for fixing a wire harness to a required shape such as a curved shape, branched shape or the like. CONSTITUTION:A tape-like or rope-like heat-shrinkable band material 3 is wound around a wire harness 1, formed into a required shape by coating a wire group 2 with cloth, at required parts of straight parts, curved parts and branched parts of the wire harness 1. Thereafter, the wound heat-shrinkable band material 3 are heated for shrinkage to bundle and fasten the wire group 2 strongly and fix the shape of the wire harness 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire harness shape fixing method for fixing the shape of a wire harness disposed in an automobile or the like.

[0002]

2. Description of the Related Art Generally, a wire harness is three-dimensionally installed in a narrow mounting space of a vehicle body. Therefore, a wire group is preliminarily arranged in a required three-axis direction in accordance with a wiring pattern specified by a vehicle type and a vehicle body. It is necessary to mold it into a curved or bent shape. Therefore, conventionally, a molded protector which is a separate member partially satisfying the bay bending condition is used, and a wire group is housed in the groove and fixed by tape winding, or is actually opened.
As disclosed in Japanese Patent No. 1881, a method is adopted in which a wire winding is fixed along a rigid molding guide, and the wire harness is fixed in a required bayonet shape.

[0003]

The above-described conventional method for fixing the shape of the wire harness is based on the mechanical strength of the shape maintaining member in which a shape maintaining member such as a molding protector for the wire harness is additionally attached to the outer circumference of the wire bundle. Since the basic idea is to fix the shape of a predetermined part of the wire harness, it is possible to fix the shape appropriately, but it is unavoidable that the shape is enlarged due to the addition of the outer circumference of the shape-holding member. There is a problem that goes against the required miniaturization of the wire harness system. Further, there is a problem in that it takes time and effort to attach the shape maintaining member to the wire harness and to fix it to the vehicle body, and the use of these causes an increase in cost. The present invention provides a method for fixing the shape of a wire harness that solves the above-mentioned drawbacks of the prior art.

[0004]

SUMMARY OF THE INVENTION The present invention for solving the above-mentioned technical problems is to provide "a necessary portion of a bay bending portion, a straight portion, and a branch portion of a wire harness in which a wire group is laid in a required shape,
Wrap a tape-shaped or string-shaped heat-shrinkable band material, and then heat-shrink the heat-shrinkable band material in the wound state to tightly bind the wire group and fix the shape of the wire harness. The method of fixing the shape of the wire harness is characterized in that

[0005]

According to the method of fixing the shape of the wire harness of the present invention having the above-described structure, the heat-shrinkable band material is wound around the wire harness at an important point, and the heat-shrinkable band material is heat-shrinked to strongly bind the wire group. The strong fastening bundle portion has a structure in which the wire group has a structure similar to that of a physical unit, and is a high-rigidity portion in which the second moment of area is significantly improved over other non-strong fastening bundle portions. Becomes Therefore, even if the strong fastening bundle portion receives a strong external force for breaking the molded shape of the wire harness, it does not cause slippage between wires or shape deformation,
The required shape of the wire harness, such as a bay bend, straight line, and branch, is fixed and held.

The shape fixing method of the present invention is not intended to improve the rigidity of the wire harness by the member added to the wire harness, but is based on the technical idea of imparting rigidity to the wire bundle itself of the wire harness. There is no shape enlargement and cost increase due to the above, and in addition, the problems of the prior art such as the number of steps for attaching the additional member to the vehicle body or the wire harness are eliminated.

[0007]

Embodiments will be described in detail below based on embodiments. That is, referring to FIG. 1 showing an embodiment of the present invention, first, a wiring jig 6 disposed on the upper surface of a molded drawing board 5 for a wire harness.
The wire group 2 is laid on the wire harness to form the wire harness 1 having the bay bending portion, the straight portion, and the branching portion, and the wire group 2 is provided with a tape shape at a key portion of the wire group 2. The heat-shrinkable band material 3 is wrapped and bound, and then the wound heat-shrinkable band material 3 is exposed to a high temperature atmosphere to be heat-shrinked. 3, the wire group 2 is strongly tightened to form a strong fastening bundle state, and the required shape of the wire harness 1 is fixed.

The wound portion of the heat-shrinkable band material 3 of the wire harness 1 of the above embodiment is shown in FIG. 2. In the state after heat-shrinking after winding, as shown in FIG. Although the group 2 is bound by the wrapping force of the heat-shrinkable band material 3, the wrapping force is not enough to tightly gather the electric wire groups 2 and tightly bind them together, so loose tightening with a gap between the wires is performed. It shows a state and lacks rigidity. However, after the heat shrinkage, the shrinkage force of the heat shrinkable band material 3 strongly generates a tightening component force in the radial direction of the wire group 2,
As shown in FIG. 2B, the electric wire groups 2 are pressed against each other by being strongly pressed to each other, and the inter-wire voids do not exist (there are extremely small voids), and the diameter is reduced. The portion strongly tightened by the band member 3 has a structure in which the electric wire group 2 approximates to a physically integrated body, and the rigidity is improved, so that the above-described action can be achieved.

In this embodiment, since the shape can be fixed only by wrapping the heat-shrinkable band material 3 on a desired place and heat-shrinking it, the work of fixing the shape of the wire harness is simple, and in addition, Since there is no outer peripheral member that obstructs the work of arranging the wire harness on the vehicle body, the work of arranging becomes easier. Therefore, the workability of the work for fixing the shape of the wire harness and the work for arranging the wire harness is improved and improved as compared with the conventional shape fixing method.

The heat-shrinkable band material 3 used in the present invention
A known resin heat-shrinkable material may be used, and the winding method may be such that the tape-shaped heat-shrinkable band material 3 is spirally overlapped and continuously wound at a required position as shown in FIG. Alternatively, as shown in FIG. 3 showing another embodiment, a cord-shaped heat-shrinkable band member 3 may be wound in an annular shape to have a finer pitch and may be wound. Partial wrapping or full wrapping of the wire harness may be carried out. The point is that the wire harness before and after being routed to the vehicle body etc. may be wrapped enough to fix and hold the required shape. .

[0011]

As described above, the method for fixing the shape of the wire harness of the present invention fixes the required shape by imparting rigidity to the wire group itself of the wire harness without adding an external member to the wire harness. Since the wire harness is held, the shape of the wire harness is not enlarged, and it is possible to meet the demand for downsizing in the field. And, compared with the prior art that uses an additional member for fixing the shape such as a protector for a wire harness,
By omitting the additional member and omitting the attaching work, the workability of the shape fixing work and the arranging work of the wire harness is improved and the cost is reduced. There are various effects described above.

[Brief description of drawings]

FIG. 1 shows a method for fixing the shape of a wire harness according to a first embodiment of the present invention, in which (A) is a perspective view of the processing procedure and the processing method, and (B) is a heat-shrinkable band material. A perspective view of the wrapping portion before heat shrinking, and (C) in the figure is a perspective view of the wrapping portion of the heat shrinkable band material after heat shrinking.

2A and 2B are cross-sectional views of a wound portion of a heat-shrinkable band material in the embodiment of FIG. 1, where FIG. 2A is a cross-sectional view before heat-shrinking and FIG. 2B is a cross-sectional view after heat-shrinking.

FIG. 3 is a perspective view showing a wound state of a heat-shrinkable band material according to another embodiment of the present invention.

[Explanation of symbols]

 1 Wire harness 2 Electric wire group 3 Heat shrinkable band material 5 Molded drawing board 6 Wiring jig

Claims (1)

[Claims] 1. A wire harness in which a wire group is laid in a required shape is provided at a required portion of a bay bending portion, a straight portion, and a branch portion.
Wrap a tape-shaped or string-shaped heat-shrinkable band material, and then heat-shrink the heat-shrinkable band material in the wound state to tightly bind the wire group and fix the shape of the wire harness. A method for fixing the shape of a wire harness, which is characterized in that