JP2007288898A - Protective structure of wire harness branching portion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a protective structure of a wire harness branching portion using simple operation, and to readily cope with a branch wire, even if the diameter is different. <P>SOLUTION: A protective sheet having an adhesive layer on its rear surface is wound and fixed on a T-shaped branching portion between a trunk wire and a branch wire of a wire harness. The protective sheet is formed into a cross shape, a continuing portion of a longitudinal portion and the vertical portion has a shape provided with cuts on both ends, and a longitudinal and lateral continuing portion is provided at the center. The longitudinal and lateral continuing porion is wound around the external circumferential surface of a branch side and a trunk wire opposite thereto, the lateral portions of both sides are each circularly wound and fixed on the entire external circumferential surface of the trunk wire of both sides of the branch portion, and both sides of the lateral portion are fixed on the external circumferential surface of opposite hemispheres, from the trunk wire to the branch wire of the branch portion. Both the sides of the longitudinal portion are stuck together and fixed on both sides of the branch wire, and the entire external circumferential portions of the trunk wire of a branching position and the branch wire are covered with the protective sheet. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a protective structure for a wire harness branch portion inserted into a corrugated tube, and more specifically, a branch line branched from a trunk line of the wire harness inserted into the corrugated tube is pulled out from an intermediate slit or insertion hole in the axial direction of the corrugated tube. In this case, the branch line is prevented from coming into contact with the both side edges of the slit and the peripheral edge of the insertion hole to cause damage.

  Wire harnesses composed of a large number of wire groups that are routed in automobiles are often taped to focus and protect these wire groups. Recently, however, the wire harnesses are passed through a bendable corrugated tube. The case of focusing protection is increasing.

When the corrugated tube is externally mounted on a branch portion where a branch line branches from the main line of the wire harness, one corrugated tube is externally mounted on the main line and from a slit or an insertion hole provided in the middle in the axial direction of the external corrugated tube The branch line is pulled out, and another corrugated tube is put on the pulled-out branch line.
However, the branch line drawn out from the corrugated tube may come into contact with both side edges of the slit and the peripheral edge of the insertion hole, and the electric wire may be damaged.

  In order to solve the above problem, Japanese Patent Laid-Open No. 2000-166054 (Patent Document 1) provides a protection structure for a wire harness branching portion shown in FIG. The annular member 5 is fitted into the insertion hole 4 provided in the corrugated tube 3, and the branch line 2 drawn from the insertion hole 4 is passed through the annular member 5. Thus, the annular member 5 is interposed between the branch line 2 and the peripheral edge of the insertion hole 4 so that the branch line 2 and the edge of the peripheral edge of the insertion hole 4 are not in direct contact with each other.

However, in the structure provided in Patent Document 1, the annular member 5 must be attached to the insertion hole 4 in a state where the branch line 2 of the wire harness is pulled out from the insertion hole 4 of the corrugated tube 3, and the installation work is performed. There is a problem that becomes complicated.
Further, since the shape of the annular member 5 is fixed, if the diameter of the annular member 5 is smaller than the diameter of the branch line 2, the branch line 2 cannot be passed through the annular member 5, and conversely with respect to the diameter of the branch line 2. If the diameter of the annular member 5 is large, a space is taken after the attachment, which becomes an obstacle. Therefore, a plurality of types of annular members 5 must be manufactured in accordance with the diameter of the branch line 2, which increases the number of parts.

JP 2000-166054 A

  The present invention has been made in view of the above problems, and it is an object of the present invention to be able to produce a protective structure for a wire harness branching portion with a simple operation and to easily cope with different branch line diameters. .

In order to solve the above-described problems, the present invention provides a protective structure for a wire harness branching portion in which a branch line branched from a trunk line of a wire harness inserted through a corrugated tube is drawn out from an intermediate slit or insertion hole in the axial direction of the corrugated tube. There,
A protective sheet having an adhesive layer on the back surface is wrapped around and fixed to the T-shaped branch portion between the trunk line and the branch line of the wire harness,
The protective sheet has a cross shape, and the continuous part of the vertical part and the horizontal part has a shape in which a vertical and horizontal continuous part is provided at the center while being cut from both ends,
The vertical and horizontal continuous portions are wound around the outer peripheral surface of the main line opposite to the branching side, and the lateral portions on both sides are fixed by sushi rolls to the entire outer peripheral surface of the main line on both sides of the branching portion. Are fixed to the outer peripheral surface of the opposite half circumference from the trunk line to the branch line, and the both sides of the vertical portion are bonded and fixed on both sides of the branch line to protect the entire outer peripheral surface of the branch line and branch line. Provided is a protective structure for a wire harness branching portion, which is covered with a sheet.

According to the said structure, since the cross-shaped protection sheet | seat is each coat | covered with the sushi winding and bonding which differ in the adhering method with respect to the trunk line and branch line of the wire harness from which an extending direction differs, it has branched in T shape. Therefore, even if it is a branched part that is difficult to cover with one sheet, the entire outer peripheral surface of the branched part can be easily covered with the protective sheet.
As described above, since the entire outer peripheral surface of the branching portion is covered with the protective sheet, even if the branch line is pulled out from the slit or the insertion hole of the corrugated tube, the drawn branch line is directly connected to the side edges of the slit and the peripheral edge of the insertion hole. Since it does not contact, it can prevent that a branch line is damaged.

Moreover, since the said protective sheet adheres to a wire harness before letting a wire harness pass through a corrugated tube, this adhesion operation can be made easy.
Furthermore, when the wire harness is passed through the corrugated tube, a tape made of polyvinyl chloride or the like is wound in advance in order to maintain the shape of the branch portion of the wire harness, but the protective sheet only covers and protects the wire harness. Instead, the shape of the branch portion of the wire harness can be maintained by sticking to the outer peripheral surface of the wire harness with the adhesive layer. This eliminates the need for conventional tape winding.

Further, when the protective sheet is used, even if the diameter of the trunk line or the branch line of the wire harness is different, the same is obtained by adjusting the number of windings of the horizontal portion around the trunk line and the amount of bonding on both sides of the vertical portion. This can be handled with a protective sheet.
Thus, the said protection sheet is set to the magnitude | size which can be shared even if the size of the trunk line and branch line of the said wire harness differs.
Thereby, what is necessary is just to produce one type of protective sheet with respect to multiple types of wire harnesses, and the versatility of a protective sheet can be improved.

  The protective sheet is made of a resin or fiber such as PVC or PP that does not wear or damage even if it interferes with the edge of a corrugated tube made of PP or PA.

As described above, according to the present invention, since the entire outer peripheral surface of the branch portion of the wire harness is covered with the protective sheet, even if the branch line is pulled out from the slit or the insertion hole of the corrugated tube, Since the edge and the edge of the peripheral edge of the insertion hole are not in direct contact, it is possible to prevent the branch line from being damaged.
In addition, the cross-shaped protective sheet is covered with the sushi rolls and the sushi rolls, which have different coating methods, on the trunk and branch lines of the wire harness with different extending directions. Even if the branch portion is difficult to cover with the sheet, the entire outer peripheral surface of the branch portion can be easily covered with the protective sheet.
Further, since the protective sheet is wound around the wire harness before passing the wire harness through the corrugated tube, the winding operation can be further facilitated.

  Furthermore, even if the diameters of the trunk lines and branch lines of the wire harness are different, the same protective sheet can be obtained by adjusting the number of times the protective sheet is wound around the main line and the amount of bonding on both sides of the vertical part. Can respond.

Embodiments of the present invention will be described with reference to the drawings.
1 to 5 show an embodiment of the present invention, and a protective structure 10 for a wire harness branching portion is a protection to be described later on the entire outer peripheral surface of a T-shaped branching portion of a wire harness W / H routed in an automobile. While covering with the sheet | seat 10, the corrugated tube 30 is armored, Furthermore, the corrugated tube 30 armored to the trunk line 1 and the corrugated tube 31 armored to the branch line 2 are tape-wrapped and fixed.

  The protective sheet 20 that covers the branch portion of the wire harness W / H is made of PVC, and as shown in FIG. 1, extends vertically from the vertical and horizontal continuous portions 20a at the center and from the upper and lower ends of the vertical and horizontal continuous portions 20a. The cross portion is formed by a vertical portion 20b and a horizontal portion 20c extending in the horizontal direction from the left and right ends of the vertical and horizontal continuous portion 20a. A cut portion 21 extending in the vertical direction is formed from both ends in a continuous portion of the vertical portion 20b and the horizontal portion 20c. Moreover, the protective sheet 20 is provided with an adhesive layer (not shown) on the entire back surface that becomes the inner peripheral surface side when wound around the wire harness W / H.

The said protection sheet 20 is used universally also for the wire harness from which a diameter differs.
Therefore, the width L1 of the vertical portion 20b is set to be longer than the half-circumferential length of the branch line of the wire harness, in accordance with the wire harness having the largest diameter among the plurality of types of wire harnesses.
Further, the width L2 of the lateral portion 20c is set so as to match the one of the plurality of types of wire harnesses having the largest trunk line diameter, and is set longer than the entire circumference of the trunk line of the wire harness.

  The corrugated tubes 30 and 31 that are externally mounted on the wire harness W / H are external protective materials having flexibility in which peaks and valleys are alternately provided in the axial direction. The corrugated tube 30 provided on the trunk line 1 is provided with a slit 32 extending along the axial direction, and an insertion hole 33 is formed by cutting out both side edges of the slit 32 at an intermediate position in the axial direction.

Next, the manufacturing method of the protection structure 10 of the wire harness branch part using the said protection sheet 20 is demonstrated.
First, as shown in FIG. 2A, the branch line 2 is branched from the trunk line 1 of the wire harness W / H using a wiring jig (not shown) or the like to produce a branching portion.
Next, the entire outer peripheral surface of the branch portion of the wire harness W / H is covered with a protective sheet 20 as shown in FIGS. Specifically, the vertical and horizontal continuous portions 20a of the protective sheet 20 are wound around the outer peripheral surface of the trunk line 1 on the opposite side to the branch side, and the lateral portions 20c on both sides are trunk lines on both sides of the branch portion as shown in FIG. Each sushi roll is fixed to the entire outer peripheral surface of 1. On the other hand, both sides of the vertical portion 20b are fixed to the outer peripheral surfaces of the opposite half circumferences from the trunk line 1 to the branch line 2, and both sides of the vertical portion 20b on both sides of the branch line 2 are shown in FIG. Stick and stick as shown.

Next, as shown in FIG. 4, the trunk line 1 of the wire harness W / H is inserted into the corrugated tube 30 through the slit 32 of the corrugated tube 30, and the branch line 2 is pulled out from the insertion hole 33. At this time, since the protective sheet 20 is wound around the entire circumference of the branch portion of the wire harness W / H, the electric wire of the branch line 2 and the peripheral edge of the insertion hole 33 are not in direct contact.
Finally, as shown in FIG. 5, another corrugated tube 31 is also provided in the vicinity of the branch portion of the branch line 2, and finally the tape T is wound around the outer peripheral surface of the corrugated tubes 30 and 31 of the wire harness branch portion. 30 and 31 are fixed.

According to the said structure, since the outer peripheral surface of the branch part of the wire harness W / H is coat | covered with the protective sheet 20, even if it pulls out the branch line 2 from the insertion hole 33 of the corrugated tube 30, it inserts with the pulled branch line 2 Since the peripheral edge of the hole 33 is not in direct contact, it is possible to prevent the branch line 2 from being damaged.
In addition, since the cross-shaped protective sheet 20 is covered by sushi winding and bonding with different covering methods on the trunk line 1 and the branch line 2 of the wire harness W / H having different extending directions, it branches into a T-shape. Therefore, even if the branch portion is difficult to cover with one sheet, the entire outer peripheral surface of the branch portion can be easily covered with the protective sheet 20.
Furthermore, since the protective sheet 20 is wound around the wire harness W / H before the main wire 1 of the wire harness W / H is passed through the corrugated tube 30, the winding operation can be further facilitated.

In addition, when winding the said protection sheet 20 around the other wire harness whose diameter of the trunk line 1 is smaller than the said wire harness W / H, as shown to FIG. 6 (A), of the horizontal direction part 20c of the protection sheet 20 The number of windings is increased.
When the protective sheet 20 is wound around another wire harness having a diameter of the branch line 2 smaller than that of the wire harness W / H, as shown in FIG. 6 (B), the longitudinal portion 20b of the protective sheet 20 The amount of bonding on both sides is increased.

Thus, even if the diameters of the trunk line 1 and the branch line 2 of the wire harness W / H are different, the number of windings of the lateral portion 20c of the protective sheet 20 around the trunk line 1 and the bonding of both sides of the longitudinal portion 20b are performed. The same protective sheet can be used by adjusting the amount.
In this embodiment, the pressure-sensitive adhesive layer is provided on the entire back surface of the protective sheet 20, but the pressure-sensitive adhesive layer may be provided only partially, for example, only at the edge.
Further, when the corrugated tube is not provided with an insertion hole for drawing a branch line, the branch line may be drawn from the slit.

It is drawing which shows the protection sheet of embodiment of this invention. (A) (B) is drawing which shows the adhering method of the protection sheet to a wire harness. The state which wound and fixed the protection sheet to the branch part of a wire harness is shown, (A) is a perspective view, (B) is an AA sectional view, (C) is a BB sectional drawing. It is drawing which shows the state which coat | covers a corrugated tube to a wire harness. It is drawing which shows the protection structure of a wire harness branch part. (A) (B) is drawing which shows a modification. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Trunk line 2 Branch line 10 Protection structure 20 of a wire harness branch part Protection sheet 20a Vertical / horizontal continuous part 20b Vertical direction part 20c Horizontal direction part 21 Cut 30, 31 Corrugated tube 32 Slit 33 Insertion hole W / H Wire harness

Claims (2)

A branch structure branching from the trunk line of the wire harness inserted through the corrugated tube is a protective structure for the wire harness branching portion that is led out from the slit in the axial direction of the corrugated tube or the insertion hole,
A protective sheet having an adhesive layer on the back surface is wound around and fixed to the T-shaped branch portion between the trunk line and the branch line of the wire harness,
The protective sheet has a cross shape, and the continuous part of the vertical part and the horizontal part has a shape in which a vertical and horizontal continuous part is provided at the center while being cut from both ends,
The vertical and horizontal continuous portions are wound around the outer peripheral surface of the main line opposite to the branching side, and the lateral portions on both sides are fixed by sushi rolls to the entire outer peripheral surface of the main line on both sides of the branching portion. Are fixed to the outer peripheral surface of the opposite half circumference from the trunk line to the branch line, and the both sides of the vertical portion are bonded and fixed on both sides of the branch line to protect the entire outer peripheral surface of the branch line and branch line. A protective structure for a wire harness branching portion, characterized by being covered with a sheet.   The protective structure of the wire harness branching part according to claim 1, wherein the protective sheet is set to a size that can be shared even if the trunk line and the branch line of the wire harness are different in size.

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