JP2008232288A - Clamp for wire harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clamp for a wire harness capable of causing no collapse in a corrugated tube even when the clamp is firmly fastened and fixed by a tape and a belt. <P>SOLUTION: A pair of grooves 9, 9 opened in the back-to-back manner is formed on both sides in the tangential direction of a corrugated tube 2 at a base end 6 of a clamp 5, and both slit ends 4, 4 of the corrugated tube 2 are respectively inserted in each grooves9. In the groove 9, a surface located on the outer side of both slit ends 4, 4 of the inserted corrugated tube 2 is formed in the tangential direction of the corrugated tube 2 while the surface located on the inner side of both slit ends 4, 4 is formed in the inclined direction from the tangential direction of the corrugated tube 2. The surfaces have substantially V-shaped section tapered off toward the center side between the grooves 9, 9. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wire harness clamp used for arranging a wire harness for an automobile.

  When an automotive wire harness is disposed on a vehicle body, a wire harness clamp (hereinafter simply referred to as “clamp”) provided at a predetermined interval along the wire harness is used. For example, as shown in Patent Document 1, this clamp includes a substrate portion having an E-shaped cross section having a pair of guide grooves that are opened back to back, and a vehicle body locking portion projecting from the substrate portion. Are known. For attaching the clamp to the wire harness, first, the substrate portion of the clamp is wound around and fixed to the wire harness with a tape, and then a corrugated tube having a slit in the axial direction is put on the wire harness. At this time, both end portions of the slit of the corrugated tube are inserted into the guide grooves of the substrate portion for positioning. Finally, the tape is roughly wound around the corrugated tube to prevent the slit from opening. Here, there is also disclosed a structure in which a belt is provided on the substrate portion and the substrate portion can be fixed to the wire harness by winding the belt. However, from the viewpoint of cost and workability, the belt is more than the substrate portion. Installed on the outside (vehicle body locking part side), first put the corrugated tube on the wire harness, then insert the board part into the slit, insert both ends of the slit into the guide groove, and finally the wire harness together with the corrugated tube by the belt It is often done to fasten and fix to.

Japanese Patent Laid-Open No. 11-150841

  When the corrugated tube is fastened and fixed in this way with a tape or a belt, the corrugated tube is crushed and both ends of the slit in the guide groove are curled inward, and the gap between the ends of the slit is widened. Although curling can be prevented by narrowing the width of the guide groove, on the other hand, it becomes difficult to insert into the guide grooves at both ends of the slit, and workability is reduced. ing. Therefore, there is a possibility that the wire harness may be damaged by exposing the electric wire from a slit that is widely opened at the attachment portion of the clamp or entering a foreign matter. In recent years, in particular, there has been a demand for smaller dimensional tolerances for wire harnesses than before, and since dimensional tolerances between clamps have been strictly controlled, there is a tendency to clamp and fix the clamps tightly to prevent lateral displacement. Problems caused by tube collapse are growing.

  Therefore, the present invention aims to provide a clamp that can effectively prevent damage to the wire harness without causing the corrugated tube to be crushed even if it is strongly tightened and fixed with a tape or a belt. .

In order to achieve the above object, the invention described in claim 1 is characterized in that each groove at the base end portion is formed in a substantially V-shaped cross section that tapers toward the center between the grooves. It is.
In order to obtain a groove suitable for preventing curling at both ends of the slit, in addition to the object of claim 1, the invention described in claim 2 has a surface located outside the both ends of the slit of the inserted tube. The surface formed in the tangential direction of the tube and located on the inner side from both ends of the slit is formed in a direction inclined from the tangential direction of the tube.
In addition to the object of the first or second aspect, the invention according to the third aspect projects the insertion portion into the tube at the proximal end portion to the wire harness side in order to improve the workability related to the clamp mounting. It is characterized by having a bulging shape.

According to the first aspect of the present invention, since both ends of the slit of the tube are fixedly positioned by the groove having a substantially V-shaped cross section, the tube is crushed even if it is strongly tightened and fixed with a tape or a belt. In this way, damage to the wire harness can be effectively prevented.
According to the second aspect of the present invention, in addition to the effect of the first aspect, a groove suitable for curling prevention at both ends of the slit can be obtained.
According to the third aspect of the present invention, in addition to the effect of the first or second aspect, the base end portion can be easily inserted from the slit even after the tube is covered with the wire harness by the bulging shape, and work related to the clamp mounting The property becomes better.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a wire harness using an example of a clamp of the present invention. A wire harness 1 in which a plurality of electric wires are bundled is covered with a corrugated tube 2 having slits 3 formed in the axial direction. A clamp 5 is inserted and attached through the slit 3 of the corrugated tube 2. The clamp 5 is provided at a base end portion 6 that is inserted into the slit 3, a vehicle body locking portion 7 that protrudes radially from the base end portion 6 to the outside of the corrugated tube 2, and a base end portion 6. The corrugated tube 2 and the belt 8 around which the wire harness 1 is wound are made of a synthetic resin, and a plurality of the corrugated tubes 2 are arranged at predetermined intervals in the axial direction of the corrugated tube 2.

  In the base end portion 6 of the clamp 5, a pair of grooves 9 and 9 that are opened back to back are formed on both sides of the left and right (tangential direction of the corrugated tube 2). 4 and 4 are inserted respectively. In the groove 9, a surface 9 a located on the radially outer side (hereinafter simply referred to as “outer side”) of the corrugated tube 2 from the slit end portions 4 and 4 of the inserted corrugated tube 2 is formed in the tangential direction of the corrugated tube 2. A surface 9b positioned on the radially inner side of the corrugated tube 2 (hereinafter simply referred to as “inner side”) from the slit end portions 4 and 4 is formed in a direction inclined from the tangential direction of the corrugated tube 2, and the grooves 9, 9 respectively. It has a substantially V-shaped cross section that tapers as it goes to the center. Moreover, the insertion part 10 to the corrugated tube 2 in the base end part 6 is formed in the bulging shape which protrudes to the wire harness 1 side.

  On the other hand, the belt 8 extends in the circumferential direction of the corrugated tube 2 on the outer side of the grooves 9 and 9 in the base end portion 6, and the plug 8 is provided at the base end portion 6 with the distal end around the corrugated tube 2. A well-known structure is adopted in which a protrusion 8 (not shown) provided in the insertion locking portion 11 and a through hole provided in the belt are locked by being inserted into and pulled into the stop portion 11 so that the belt 8 can be fixed at that position. is doing.

When the corrugated tube 2 is attached using the clamp 5 configured as described above, the corrugated tube 2 is first put on the wire harness 1, the proximal end portion 6 of the clamp 5 is inserted into the slit 3, and both end portions 4, 4 of the slit are inserted. Are inserted into the grooves 9 and 9 of the base end 6 respectively. At this time, since the groove 9 is wide open to the outside which becomes the entrance of the slit both ends 4, the slit both ends 4 can be smoothly inserted and positioned smoothly on the back side by the tapered shape of the groove 9. .
After positioning the slit ends 4 and 4, the belt 8 is circulated around the corrugated tube 2, passed through the insertion locking portion 11, and pulled with a predetermined strength. The clamp 5 can be fixed at the position by tightening. At this time, even if the corrugated tube 2 is strongly tightened with the belt 8, the slit end portions 4 and 4 are pressed against the back (tapered side) of each groove 9 to restrict the movement in the radial direction. , 4 are prevented from curling inward. Therefore, the slit 3 is not greatly opened at the attachment portion of the clamp 5 as shown in FIG. 2, and the exposure of the electric wire and the intrusion of foreign matters are preferably prevented.

Thus, according to the clamp 5 of the said form, since each groove | channel 9 of the base end part 6 was formed in the cross-sectional substantially V shape which becomes taper as it goes to the center side between the grooves 9, 9, it is a corrugated tube. The two slit ends 4, 4 are fixedly positioned. Therefore, even if the belt 8 is strongly tightened and fixed, the corrugated tube 2 is not crushed and the wire harness 1 can be effectively prevented from being damaged.
Further, a surface 9 a located outside the slit both ends 4 of the corrugated tube 2 in which the groove 9 is inserted is formed in a tangential direction of the corrugated tube 2, and a surface 9 b located inside the slit both ends 4 is formed on the corrugated tube 2. By adopting a structure in which each is formed in a direction inclined from the tangential direction, a groove suitable for curling prevention at both ends 4 of the slit can be obtained.
Furthermore, the insertion part 10 to the corrugated tube 2 in the base end part 6 is formed in a bulging shape that protrudes toward the wire harness 1 side, so that the base end part from the slit 3 even after the corrugated tube 2 is covered on the wire harness 1 6 becomes easy to insert, and workability related to clamp mounting becomes better.

In the above embodiment, the groove is formed so that the surface outside the slit both ends of the corrugated tube is in the tangential direction of the corrugated tube, and the surface inside the slit both ends is inclined from the tangential direction of the corrugated tube. These may be reversed, or both may be formed in a direction inclined from the tangential direction of the corrugated tube. Moreover, the surface located inside the slit both ends in a groove | channel is not restricted to a plane, It is also possible to form in the circular arc shape which swells to the slit both ends 4 side like the grooves 12 and 12 shown in FIG.
Further, the bottom of the groove (the tip having a substantially V-shaped cross section) is not limited to a pointed shape, and curling inward of the slit ends 4, 4 is prevented as in the grooves 13, 13 shown in FIG. If possible, you may leave the surface 13a which has the width | variety which the slit both ends 4 substantially fit in a bottom part.

On the other hand, if the shape of the insertion part at the base end part can be easily inserted into the slit, it can be appropriately changed, for example, to have a two-stage diameter, and of course, the bulging shape is eliminated and the tangential direction of the corrugated tube It is also possible to form a flat surface parallel to the groove or to form a recess in accordance with the inclined surface of the groove.
In addition, the shape of the body locking part and belt can be changed as appropriate.For example, as explained in the background art above, instead of using a belt, mounting pieces protruding from the base end part in the axial direction are used. Even if the structure is such that the tape is wound around the periphery of the corrugated tube and tightened and fixed, or the belt is directly wound around the wire harness and then the corrugated tube is covered and the tape is wound and fixed. Adoption is possible.

It is a cross-sectional view which shows the attachment structure of a clamp. It is a bottom view of the clamp part in FIG. It is a cross-sectional view which shows the attachment structure of the clamp of the example of a change. It is a cross-sectional view which shows the attachment structure of the clamp of the example of a change.

Explanation of symbols

  1 .. Wire harness, 2 .. Corrugated tube, 3 .. Slit, 4 .. Both ends of slit, 5 .. Clamp for wire harness, 6 .. Base end, 7. Belt, 9, 12, 13, .. groove, 10 .. insertion part.

Claims (3)

A base end portion that is inserted through the slit into a flexible tube that has a slit in the axial direction and covers the wire harness, and a vehicle body locking portion that protrudes from the base end portion to the outside of the tube. A clamp for a wire harness in which a pair of grooves into which both ends of the slit of the tube are inserted are formed in the base end portion so as to open back to back in the tangential direction of the tube,
The wire harness clamp, wherein each groove of the base end portion is formed in a substantially V-shaped cross-section that tapers toward the center between the grooves.   The groove is formed such that the surface located outside the both ends of the slit of the inserted tube is formed in the tangential direction of the tube, and the surface located inside the both ends of the slit is formed in a direction inclined from the tangential direction of the tube. The wire harness clamp according to claim 1, wherein the wire harness clamp is provided.   The wire harness clamp according to claim 1 or 2, wherein an insertion portion of the proximal end portion into the tube has a bulging shape protruding toward the wire harness side.

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