JP2010166789A - Mounting structure of corrugated tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a corrugated tube that prevents abnormal sound due to contact of the divided ends of a slit of the corrugated tube grinding. <P>SOLUTION: The mounting structure of the corrugated tube, which externally covers a corrugated tube comprising a resin molding alternately provided with annular crests and valleys in the longitudinal direction and a slit provided all the way in the longitudinal direction over a wire harness cable group, includes a center part 11 extending in the longitudinal direction (axial linear direction) to be sandwiched by the slit 2 and a spacer comprising an elastic material provided with fitting pieces 12 and 13 fit in the valley part 4 that sandwiches the slit of the corrugated tube with space in the longitudinal direction from both right and left sides of the top of the center part. The center part of the spacer is inserted into the slit at least in a curved area of the corrugated tube. The fitting pieces on both sides are fit in the valleys. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mounting structure for a corrugated tube that is externally mounted on a wire harness that is routed in an automobile, and more specifically, suppresses the generation of abnormal noise due to contact between split surfaces of slits provided along the axial direction of the corrugated tube. is there.

In many cases, a wire harness routed in an automobile is inserted into a corrugated tube made of a resin molded product in order to focus an electric wire group constituting the wire harness and protect the outer member.
The corrugated tube is provided with alternating crests and troughs in the circumferential direction in the length direction, so it has excellent flexibility, and according to the skill of the operator compared to the case where the wire group is bundled with tape. There is no difference in quality, and there is an advantage that the electric wire group can be bundled in a relatively short time.
That is, in order to improve the workability of inserting the electric wire group, as shown in FIG. 4, a slit 101 extending in the axial direction of the corrugated tube 100 is provided, and the slit 101 is opened to horizontally insert the electric wire group W (from the direction perpendicular to the axis). ) Inserted.

As described above, since the corrugated tube is provided with the slit 101 so that the electric wire group can be laterally inserted, there is a problem that the slit is easily opened when the slit is positioned on the outer periphery of the bent portion. Further, due to traveling vibration of the vehicle or the like, the split ends 101a and 101b sandwiching the slit 101 rub against each other to generate an abnormal noise that sounds “pumpy”.
Even in the passenger compartment, the wire harness routed on the back side of the column traverse and meter has a corrugated tube, and this abnormal noise is transmitted to the passenger compartment, so it is necessary to reduce or prevent the generation of abnormal noise. .

  Therefore, as shown in FIG. 5, the vinyl sheet 120 is wound around the wire group W at the bending portion, the pasting end 120 a is pulled out from the slit 101 of the corrugated tube 100, and the vinyl sheet 120 pulled out together with the corrugated tube 100 is cotton tape. 121 is half-wrapped. As described above, by inserting the vinyl sheet 120 into the slit 101, it is possible to prevent the split ends 101a and 101b from rubbing and generating abnormal noise.

  However, as described above, an excessive exterior specification in which the vinyl sheet 120 is wound around the wire group W, the exterior is covered with the corrugated tube 100, and is further half-wrapped with the cotton tape 121, increases work costs and increases the cost. Therefore, quality maintenance becomes difficult.

In order to solve the above problem, Japanese Patent Application Laid-Open No. 2001-37041 proposes a long spacer 110 that is inserted into the slit 101 of the corrugated tube 100 over the entire length as shown in FIGS. .
The spacer 110 has left and right arms 110b and 110c projecting from both ends of a U-shaped main body 110a inserted along the axial direction in the slit 101, and hooks 110d and 110e are provided at the ends of the arms. Yes. On the other hand, V-shaped locking grooves 102 and 103 are cut in the corrugated tube 100 in parallel along both sides of the slit 101. Note that it is unclear whether the locking grooves 102 and 103 are provided in the peak portion (annular convex portion) 105 or the valley portion (annular concave portion) of the corrugated tube. Is recognized.
The main body portion 110a of the spacer 110 is inserted, and the hook portions 110d and 110e of the arm portions on both sides are pushed into the locking grooves 102 and 103 of the corrugated tube 100, respectively, and the mouth of the slit 101 is closed.

JP 2001-37041 A

When the spacer 110 shown in FIG. 6 is used, the arm portions 110 b and 110 c are in contact with the upper surface of the peak portion 105 of the corrugated tube 100, and the straight spacer 110 is inserted over the entire length of the slit 101. In addition, since the hook portions 110d and 110e of the arm portions 110b and 110c are also locked in the locking grooves 102 and 103 that are continuous in the length direction of the peak portion 105, the spacer 110 is positioned in the axial direction of the corrugated tube 100. It is not positioned and is easy to move, and further tape winding is required to position and maintain the spacer 110 with respect to the corrugated tube 100.
Further, when the spacer 110 that is straight over the entire length is used, it is difficult to bend at the bent portion, and the spacer 110 does not follow the bend of the corrugated tube 100 at the bent portion, and the hook portions 110d and 110e extend from the locking grooves 102 and 103. May rise and the spacer 110 may be detached from the corrugated tube 100.
Further, the corrugated tube also needs to have a special shape provided with the locking grooves 102 and 103, and there is a problem that a corrugated tube that is widely used cannot be used.

In order to solve the above-mentioned problems, the present invention provides a corrugated structure comprising a resin molded product in which annular ridges and valleys are alternately provided in the length direction and one slit is provided in the entire length in the length direction. A corrugated tube mounting structure for covering a tube with a wire group of a wire harness,
A center part extending in the length direction (axial direction) sandwiched between the slits, and a fitting that fits into a valley part that sandwiches the slits of the corrugated tube with a distance in the length direction from both the left and right sides of the upper surface of the center part Provided with a spacer made of elastic material with a piece,
A corrugated tube mounting structure is provided, wherein at least a curved region of the corrugated tube, a central portion of the spacer is inserted into the slit, and fitting pieces on both sides are fitted into valleys.

The spacer according to the present invention is formed of an elastic material made of rubber, elastomer, and flexible resin, and a fitting piece to be fitted to the valley portion of the corrugated tube is projected from the center portion inserted into the slit. ing. That is, in Patent Document 1, only the arm portion of the spacer is overlapped on the outer surface of the peak portion, whereas in the present invention, a fitting piece is fitted to each valley portion, and the spacer is made of an elastic material. By being formed by, it can follow the curve of a corrugated tube reliably, and it can attach without lifting from a corrugated tube. As described above, since the central portion of the spacer made of an elastic material is inserted between the split ends of the slit in the curved portion, the noise generated by the friction between the split ends of the slit generated in the curved portion is prevented. can do.
Furthermore, since it is not necessary to provide a locking groove on the side of the corrugated tube to which the spacer is attached as in Patent Document 1, a widely used corrugated tube can be used.
Furthermore, even if the corrugated tubes have different diameters, the corrugated tubes can be used in common for different types of corrugated tubes as long as the pitches of the peaks and valleys are equal.

The spacer may be attached to the entire length of the corrugated tube, but since noise generation due to friction between the split ends of the slit occurs in the curved region, the spacer may be attached only to the curved wiring region of the wire harness. .
And it is preferable to tape the spacer attached to the curved region together with the corrugated tube. Further, in the curved region, it is preferable that the slit is positioned on the inner periphery where the opening is not opened, and the spacer is disposed on the inner periphery side.

  The spacer has a thin strip at the center to be inserted into the slit, the thickness is 0.3 to 1.0 mm, the height is 0.5 mm to 5.0 mm, and the fitting pieces on both sides are the valleys of the corrugated tube It is preferable to make it arcuate so that the protrusion dimension is 2 mm to 5 mm. Thus, since the center part of the spacer inserted into the slit has a thin strip shape, the opening of the slit at the spacer mounting part is minimized, and the part inserted into the slit of Patent Document 1 is U-shaped. Open mouth is smaller than the case. Therefore, even if the spacer is not provided in the entire length of the corrugated tube but only in the curved region, it is possible to prevent the opening of the slit in the portion where the spacer is not attached.

The spacer is formed as a continuous material, and the continuous material is cut and used according to the attachment length to the corrugated tube.
As described above, when the spacer is provided as a continuous material, it can be cut according to the attachment length to the corrugated tube to have an appropriate length, which is easy to use.

  As described above, in the present invention, since the fitting piece that fits into the trough from the central part of the spacer inserted into the slit of the corrugated tube is formed of an elastic material, it floats from the curved corrugated tube Can be installed without Since the central portion of the spacer is inserted into the slit and interposed between the divided ends, it is possible to reliably prevent the generation of abnormal noise due to friction between the divided ends. In addition, as compared with the noise countermeasures shown in FIG. 5 which are generally used, it is only necessary to attach the spacer to the slit. Therefore, it is possible to improve the workability and reduce the cost by eliminating the excessive exterior.

BRIEF DESCRIPTION OF THE DRAWINGS Embodiment of this invention is shown, (A) is the whole figure of the wire harness which armored the corrugated tube, (B) is an enlarged view of a spacer attachment part. It is sectional drawing of a spacer attachment part. (A) is a perspective view of a spacer, (B) is sectional drawing. It is drawing which shows the problem of a corrugated tube. It is sectional drawing which shows the conventional countermeasure against abnormal noise generation. (A) and (B) are drawings showing other conventional examples.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.
The electric wire group W routed in the automobile is covered with a corrugated tube 1 made of a resin molded product, and a spacer 10 (indicated by crosshatching in the figure) is attached to the slit 2 of the corrugated tube 1.
The corrugated tube 1 is a general-purpose product made of a resin molded product that has been used in the related art. The corrugated tube 1 is provided with annular crests 3 and troughs 4 alternately in the length direction L, and one for the entire length in the length direction. The slit 2 is provided.

The spacer 10 is made of a continuous material having the shape shown in FIG. 3, and is used by cutting according to the length attached to the corrugated tube 1. In FIG. 3, the solid line portion indicates the cut portion, and the alternate long and short dash line indicates the continuous material.
The spacer 10 is made of rubber, elastomer or flexible resin, and is made of rubber in this embodiment.

The spacer 10 has a thin strip-shaped continuous central portion 11 extending in the length direction (axial direction) and a length in the length direction from both the left and right sides of one end (upper surface in the figure) of the central portion 11. Fitting pieces 12 and 13 projecting in the left-right direction orthogonal to the direction are provided.
The pitch of the fitting pieces 12 and 13 corresponds to the pitch of the valley portions 4 of the corrugated tube 1, and the width S1 of the fitting pieces 12 and 13 is slightly shorter than the width S2 of the valley portions 4. Further, the thickness of the fitting piece is substantially equal to the height difference between the crest 3 and the trough 4, and the height is substantially the same as the top surface of the crest 3 with the fitting pieces 12, 13 fitted to the trough 4. I am trying.
Specifically, the thickness t of the central portion 11 is 0.3 to 1.0 mm, the height h is 0.5 to 5.0 mm, and the projecting dimensions a of the fitting pieces 12 and 13 are 2 mm to 5 mm. Yes. The fitting pieces 12 and 13 have an arc shape so as to follow the arc of the valley portion 4.

The corrugated tube 1 protects the electric wire group W by opening the slit 2 in the electric wire group W of the wire harness and inserting the slit 2 sideways.
When the wire harness having the corrugated tube 1 is arranged in an automobile, the slit 2 is positioned on the inner peripheral side in the portion that becomes the curved region X, and the spacer 10 is attached to the slit 2.

The spacer 10 has a central portion 11 inserted between the split ends 2 a and 2 b of the slit 2, and fitting pieces 12 and 13 are fitted in the valley portions 4 and 4 on both sides facing each other across the slit 2.
With the spacer 10 attached to the slit 2, the adhesive tape 8 is wound around the outer periphery of the spacer 10 and the corrugated tube 1 as shown in FIG. 2. The adhesive tape 8 does not need to be half-wrapped and may be roughly wound. In FIG. 1A, the adhesive tape 8 is not wound.
In addition, you may attach the spacer 10 to the slit 2 of the full length of the corrugated tube 1 armored to the electric wire group W. In that case, it is preferable that the spacer 10 attached to the corrugated tube 1 in a region arranged in a substantially straight line is partially fixed to the corrugated tube 1 with the adhesive tape 8.

  As described above, when the spacer 10 is attached to the slit 2 of the corrugated tube 1, the central portion 11 of the rubber spacer 10 is interposed between the split ends 2 a and 2 b of the slit 2. Therefore, the split ends 2a and 2b of the slit 2 do not rub against each other, and the generation of abnormal noise can be prevented.

Since the spacer 10 is made of rubber and the fitting pieces 12 and 13 are inserted into the valley 4 of the corrugated tube 1, the spacer 10 is not displaced. And even if the diameter of the corrugated tube 1 is different, the length of insertion of the fitting pieces 12 and 13 into the valleys 4 and 4 is only slightly different. Can be used.
In addition, since the spacer 10 is inserted into the slit 2 and is merely wound in the bent region, the wire group shown in FIG. 5 is wound with a sheet, the sheet is pulled out from the slit, and the corrugated tube is adhered. Compared with the case of half-wrapping with a tape, a sheet to be wound around the electric wire group can be made unnecessary, and the number of operations for pulling out the sheet from the slit can be made unnecessary. In this way, the number of required parts can be reduced and the number of operations is also small, so that the cost can be reduced.

DESCRIPTION OF SYMBOLS 1 Corrugated tube 2 Slit 3 Mountain part 4 Valley part 10 Spacer 11 Center part 12, 13 Fitting part 8 Adhesive tape

Claims (4)

A corrugated tube made of a resin molded product in which annular crests and troughs are provided alternately in the length direction and one slit is provided in the entire length in the length direction is placed on the wire group of the wire harness. The mounting structure of the corrugated tube
A center portion that is sandwiched between the slits and extends in the axial direction, and a fitting piece that fits in a trough portion that sandwiches the slit of the corrugated tube with a space in the length direction from the left and right sides of the upper surface of the center portion. A spacer made of elastic material,
A corrugated tube mounting structure, wherein at least a curved region of the corrugated tube, a central portion of the spacer is inserted into the slit, and fitting pieces on both sides are fitted into a trough portion.   The taper is wound around the spacer inserted into the slit of the corrugated tube in the curved routing region of the wire harness together with the corrugated tube, and the spacer is attached by positioning the slit on the inner peripheral side of the curve. The corrugated tube mounting structure described in 1. The spacer is formed of an elastic material made of rubber, elastomer, flexible resin,
The central portion to be inserted into the slit has a thin strip shape, the thickness is 0.3 to 1.0 mm, the height is 0.5 mm to 5.0 mm, and the fitting pieces on both sides are along the valley of the corrugated tube. The mounting structure for a corrugated tube according to claim 1 or 2, wherein the protrusion has a circular arc shape and has a protruding dimension of 2 mm to 5 mm.   The corrugated tube mounting structure according to any one of claims 1 to 3, wherein the spacer is formed as a continuous material, and the continuous material is cut according to a mounting length to the corrugated tube.

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