JP2010093959A - Wire harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a group of electric wires from being exposed from a corrugated tube at a T-shaped branch of a wire harness externally mounted with the corrugated tube. <P>SOLUTION: A wire harness is configured such that a branch line is branched in a T-shape from a trunk line of the wire harness routed in a vehicle while the trunk line 1 and the branch line 2 are externally mounted with a corrugated tube, respectively. A first corrugated tube 10 is made to cover one side 1-B of both sides, across a branch position of the branch line 2, of the trunk line. The first corrugated tube is bent at the branch position and made to continuously cover to the branch line 2. A cut 11 is made in the inner periphery of the first corrugated tube 10 at the branch position where the first corrugated tube is bent. The cut part is opened at the branch position. The tip of a second corrugated tube 20 covering the other side of both sides of the trunk line is fit to the part of the opening 16 of the first corrugated tube 10. A tape is wound around the outer periphery of the second corrugated tube and that of the first corrugated tube at the branch position so as to fix the second corrugated tube and the first corrugated tube to each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wire harness routed in a vehicle, and more particularly, to improve a wire harness with a corrugated tube at a branch position.

Wire harnesses that are routed to automobiles and connected to electrical components include a case where an adhesive tape is half-wrapped and a ring-shaped convex portion and a concave portion for bundling and protecting the electric wire group constituting the wire harness. There is a case where an electric wire group is covered with a corrugated tube made of a resin molded product formed alternately in the length direction.
When the corrugated tube is used, the adhesive tape is wound only when the wire group is inserted into the corrugated tube, whereas the variation in the finish accuracy depends on the skill level of the operator. In addition, since the corrugated tube is rich in flexibility, recently, the wire harness often covers the electric wire group with the corrugated tube.

As described above, using a corrugated tube as an exterior material has the advantage that there is no variation in finishing accuracy due to skill, but at the branch position where the branch line branches from the trunk line of the wire harness, the corrugated tube that is exteriorized on the trunk line and the exterior to the branch line There is a problem that the connection with the corrugated tube is not easy.
For this reason, the present applicant has made various proposals regarding the connection between corrugated tubes at the branch position of the wire harness.

  For example, in Japanese Patent Application Laid-Open No. 11-205944 (Patent Document 1), as shown in FIG. 5, when the branch line W2 branches in a substantially right angle direction at the T-shaped branch position B of the trunk line W1, the branch line W2 extends from the branch position. A small-diameter corrugated tube CB2 and CB3 are first covered over the existing branched main line W3, a large-diameter corrugated tube CB1 is covered over the main line W1, and a corrugated tube CB3 with a large-diameter corrugated tube CB1 attached in advance at the branching position. The tape T is wound around the corrugated tube CB2 that is overlapped and fitted over the branch line W2 to cover the branch line W2.

  In the configuration of Patent Document 1, it is necessary to attach corrugated tubes CB2 and CB3 to the branch line W2 and the branched line W3, respectively, and the main line W1 has a large corrugated tube CB1 and a branched line W3 on the distal end side. It is necessary to divide the small-diameter corrugated tube CB3 into the exterior. As described above, since the corrugated tube is divided, the corrugated tube must be covered three times including the exterior of the corrugated tube to the branch line W2. There is.

JP-A-11-205944

  The present invention has been made in view of the above problems, and extends from the trunk line in the orthogonal direction while allowing the corrugated tube to be continuously sheathed on the trunk line W1 and the branched line W3 extending from the T-shaped branch position. An object is to prevent the branch line W2 from being exposed to the corrugated tube that is externally mounted on the branch line W2.

In order to solve the above problems, the present invention is a wire harness in which a branch line branches off from a trunk line of a wire harness routed in a vehicle in a T shape, and the trunk line and the branch line are covered with a corrugated tube,
The first corrugated tube that covers one side of the trunk line on both sides across the branch position of the branch line is bent at the branch position and continuously covered to the branch line, and the inner circumference of the bent branch position of the first corrugated tube A cut is made in the part, the cut part is opened at the branch position, and the tip of the second corrugated tube covered on the other side of the main line is fitted to the opened part of the first corrugated tube, The wire harness is characterized in that a tape is wound around and fixed to the outer peripheral surfaces of the second corrugated tube and the first corrugated tube.

As described above, in the present invention, the first corrugated tube is bent by approximately 90 degrees at the branch position, and continuously covered from one side of the trunk line to the branch line. If a notch is made in a portion corresponding to the inner peripheral side of the bending position of the first corrugated tube, the inner peripheral side is greatly opened while the outer peripheral side is continuous by 90 ° bending. In this way, by greatly opening one first corrugated tube at the branching position, the distal end side of the second corrugated tube covering the other trunk line across the branching position can be positioned at the opening portion of the first corrugated tube. Thus, the electric wire group can be prevented from being exposed at the branch position. As described above, the first and second corrugated tubes are fixed by winding the adhesive tape around the branch position where the tip of the second corrugated tube is inserted in the opening portion of the first corrugated tube.
With this configuration, there are two corrugated tubes, a first corrugated tube and a second corrugated tube, and the work of attaching the corrugated tube to the electric wire group only needs to be performed twice. Therefore, compared with the case where the three corrugated tubes of patent document 1 each require the attachment operation | work which attaches to an electric wire group, component cost and an operation | work number can be reduced.
Furthermore, the exposure of the electric wire group on the main line side and the branch line side at the branch position can be eliminated, and the protection function of the electric wire group can be enhanced.

The first corrugated tube has a diameter smaller than that of the second corrugated tube, and the first corrugated tube is covered with a branch line that is branched and bent at a branching position and a branched line that is one side of the trunk line side, The corrugated tube is preferably covered on the other side of the trunk line until reaching the branch position, and the tip of the second corrugated tube is preferably covered on the outer periphery of the first corrugated tube opened at the branch position.
This is because the amount of electric wire on the remaining branch line side of the trunk line from which the branch line to be bent is branched decreases from the branch position, and the outer diameter of the electric wire group decreases from the other side across the branch position. Also, the outer diameter of the branch line to be bent is naturally smaller than the outer diameter of the main line. In this way, by continuously covering the branch line with the smaller outer diameter and the branched line side of the trunk line with the first corrugated tube, the difference between the inner diameter of the corrugated tube and the outer diameter of the wire group can be reduced. The movement of the electric wire group in the corrugated tube can be suppressed.
On the other hand, since the outer diameter of the trunk line until reaching the branch position is large, the trunk line portion is covered with the second corrugated tube and is not continued to the branch line. In addition, by making the first corrugated tube smaller in diameter than the second corrugated tube, it is possible to externally fit the second corrugated tube so as to overlap the periphery of the opened first corrugated tube at the branching position. Exposure can be reliably prevented.

The first and second corrugated tubes are slit corrugated tubes having slits continuous along the axial direction, and the cut at the bent position is a circumferential cut perpendicular to the slit, and the cut Is provided on the half circumference of the first corrugated tube,
In addition, it is preferable that the second corrugated tube is fitted on the first corrugated tube while a slit is positioned on the bent branch line side and the slit is opened.

In this way, when a cut made of a slit of about a half circumference is made in a circumferential direction orthogonal to the axial slit, when the first corrugated tube is bent by approximately 90 degrees at the branch position, the first corrugated tube is only on the outer circumferential side. In a continuous state, the inner peripheral side can be opened more than half a round, and the tip of the second corrugated tube can be smoothly inserted into the opening. The incision provided on the inner peripheral side is not limited to the slit in the axial direction and the slit in the orthogonal direction, but may be a V-shaped incision and opened larger at the bending position.
Moreover, it is preferable to use a corrugated tube with a slit in order to improve the attachment property to the electric wire group also for the second corrugated tube.

  Note that the branch line that is bent and extended from the main line at the T-shaped branch position is not necessarily bent by 90 degrees, but also when the branch line is extended from the main line by bending, for example, 30 degrees or more. Can be preferably used.

As described above, in the wire harness of the present invention, at the T-shaped branch position, the first corrugated tube is continuously covered from the main line side to the branch line that is bent and branched, and the notch provided at the branch position is on the inner peripheral side. By opening at, the second corrugated tube that covers the other side of the trunk line is positioned at the opening portion of the first corrugated tube, and exposure of the electric wire group at the branch position can be easily prevented.
Moreover, the number of corrugated tubes may be two, so that the corrugated tube can be attached to the electric wire group only twice, and the number of parts and the attaching operation can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
An embodiment is shown in FIGS.

  A T-shaped branch portion P in which the branch line 2 is extended by bending by 90 degrees is provided at an intermediate position in the length direction of the trunk line 1 composed of the wire group W. In the trunk line 1, the outer diameter of the trunk part 1 -A on one side until reaching the branch part P is large, and the outer diameter of the branched line part 1 -B on the tip side where the branch line 2 is branched is small.

A first corrugated tube 10 with a small-diameter slit is continuously covered continuously to the branched line portion 1-B of the main line having a small outer diameter on one side across the branch portion P of the main line 1 and the branch line 2. The first corrugated tube 10 is bent at approximately 90 degrees at the branch portion P.
On the other hand, the second corrugated tube 20 with a large-diameter slit is placed on the trunk portion 1 -A of the trunk line 1.
In a state where the distal end side of the second corrugated tube 20 is positioned at the opening 16 of the first corrugated tube 10 described later at the branching portion P, the electric wire group W at the branching portion P is completely covered, and the adhesive tape T Thus, the first and second corrugated tubes 10 and 20 are fixed.

  Each of the first and second corrugated tubes 10 and 20 is made of a resin molded product, and is provided with an annular projection 10a, 20a and recess 10b, 20b in the circumferential direction alternately in the axial direction and has flexibility. Yes. The first and second corrugated tubes 10 and 20 are slit corrugated tubes having slits 10c and 20c continuous in the axial direction as described above, and the slits 10c and 20c are opened so that the electric wire group can be moved from the direction perpendicular to the axis. It can be placed sideways.

  As shown in FIG. 2A, the first corrugated tube 10 is preliminarily formed with a notch 11 made of a slit of about half a circumference in a circumferential direction perpendicular to the slit 10c, at a portion bent at a right angle at the branch portion P. . When the notch 11 is provided, when the first corrugated tube 10 is bent, the notch 11 opens as shown in FIG. 2B, and when the first corrugated tube 10 is bent at a right angle, the notch 11 becomes as shown in FIG. A 90-degree opening 16 is generated with the outer peripheral portion 12 as a fulcrum. In this state, both the front and rear surfaces and the lower surface are opened, and in the drawing, the peripheral portions 13 and 14 sandwiching the notch 11 are positioned on the upper side portion and the right side portion.

  The first corrugated tube 10 is continuously covered by being bent at a right angle at the branching portion P between the branched portion 1-B and the branch line 2 of the trunk line 1. Further, the slit 10c side of the first corrugated tube 10 is placed so as to face downward in the drawing on the branched line portion 1-B side, on the inner peripheral side in the branching portion P, and on the left side in the drawing on the branch line 2 side, and the cut 11 is branched. The portion P is bent at a right angle and is located on the inner peripheral side.

  The first corrugated tube 10 is in the state shown in FIG. 2C at the branch portion P, and is in a state in which a large opening 16 is formed toward the trunk portion 1 -A of the trunk line 1. In this state, the peripheral edge portion 13 with the notch 11 interposed therebetween is located at the position of the branched line portion 1-B opposite to the trunk portion 1-A of the branching portion P, and the peripheral edge portion 14 is located on the branch line 2 side. It becomes a state to do. Therefore, the lower surface and both front and rear surfaces of the branch portion P are located at the opening 16 of the first corrugated tube 10 and are not covered with the first corrugated tube 10, and the electric wire group W is exposed.

  On the other hand, the second corrugated tube 20 is fitted on the trunk portion 1 -A of the trunk line 1, and the slit 20 c is positioned on the upper surface in the drawing which is the branch side of the branch line 2.

Next, the attaching operation of the first and second corrugated tubes 10 and 20 will be described.
As shown in FIG. 3 (A), the first corrugated tube 10 is continuously covered from the branched line part 1-B of the trunk line 1 to the branch line 2, bent at a right angle at the branched part P, and the inner peripheral side is cut by 11 It is wide open.
In this state, as shown in FIG. 3 (B), the second corrugated tube 20 covered on the trunk portion 1-A of the trunk line 1 is moved toward the branch portion P, and the first corrugated tube 10 is moved at the branch portion P. The second corrugated tube 20 covers the front and rear surfaces and the lower surface of the electric wire group W that hits the opening 16 that is not covered with. On the upper surface side where the branch line 2 branches, the slit 20 c of the second corrugated tube 20 is widened and overlapped with the outer surface of the peripheral edge portion 14 of the first corrugated tube 10. Further, the distal end side of the second corrugated tube 20 is overlapped on the outer surface of the peripheral edge portion 13 on the branched line portion 1-B side.

As described above, the opening 16 is provided in the first corrugated tube 10 at the branch portion P, the opening 16 is covered with the second corrugated tube 20, and the second corrugated tube 20 is overlapped on the peripheral portions 13 and 14 sandwiching the notch 11. Thus, as shown in FIG. 3C, the first and second corrugated tubes 10 and 20 are fixed by winding the adhesive tape T around the branch position in a crotch state.
Note that the adhesive tape may be wound around only the overlapping side of the peripheral edge portion 13 of the first corrugated tube 10 on the tip side of the second corrugated tube 20.

If it is the said structure, the branch part P where the branch line 2 branches from the trunk line 1 can be completely covered with the 1st, 2nd corrugated tubes 10 and 20. FIG.
And the corrugated tube to be used is only the two first and second corrugated tubes 10 and 20, and the corrugated tube can be attached to the electric wire group only twice.
Furthermore, since the electric wire group W is completely covered with the first and second corrugated tubes 10 and 20, the amount of winding of the adhesive tape can be reduced.

The present invention is not limited to the above-described embodiment. As shown in FIG. 4A, the notch provided on the inner peripheral side of the bent portion of the first corrugated tube 10 is not formed into a slit shape, but as a V-shaped notch 11-A. Also good. Thus, if the notch 11-A is enlarged, the 1st corrugated tube 10 in a branch part can be opened large smoothly.
Further, as shown in FIG. 4B, a rectangular notch 11-B may be provided.

Embodiment of the wire harness of this invention is shown, (A) is an external view, (B) is a principal part enlarged view. (A)-(C) are drawings which show the state where the notch of the 1st corrugated tube and bending were added to this notch. (A)-(C) are drawings which show the attachment process of a 1st, 2nd corrugated tube. (A) (B) is drawing which shows the modification of the notch | incision of a 1st corrugated tube. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Trunk line 1-A Core part 1-B Branch line part 2 Branch line 10 1st corrugated tube 11 Notch 12 Outer peripheral part 13, 14 Peripheral part 16 Opening 20 2nd corrugated tube 10c 20c Slit W Electric wire group P Branch part T Adhesive tape

Claims (3)

A wire harness in which a branch line branches in a T shape from a trunk line of a wire harness routed in a vehicle, and the trunk line and the branch line are covered with a corrugated tube,
A first corrugated tube covering one side of the trunk line on both sides sandwiching the branch position of the branch line is bent at the branch position and continuously covered to the branch line, and the inner circumference of the branch position where the first corrugated tube is bent A cut is made in the part, the cut part is opened at the branch position, and the tip of the second corrugated tube covered on the other side of the main line is fitted to the opened part of the first corrugated tube, A wire harness, wherein a tape is wound around and fixed to the outer peripheral surfaces of the second corrugated tube and the first corrugated tube.   The first corrugated tube has a diameter smaller than that of the second corrugated tube, and the first corrugated tube is covered with a branch line that is branched and bent at a branching position and a branched line that is one side of the main line side, The wire harness according to claim 1, wherein the corrugated tube is placed on the other side of the trunk line until reaching the branch position, and the tip of the second corrugated tube is placed on the outer periphery of the first corrugated tube opened at the branch position. The first and second corrugated tubes are slit corrugated tubes having slits continuous along the axial direction, and the cut at the bent position is a circumferential cut perpendicular to the slit, and the cut Is provided on the half circumference of the first corrugated tube,
The wire harness according to claim 1 or 2, wherein the second corrugated tube is fitted with the first corrugated tube while a slit is positioned on the bent branch line side and the slit is opened.

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