JP2017221036A - Corrugate tube, wire harness, and processing method of corrugate tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology that can easily change a portion of a corrugate tube which has high bending rigidity.SOLUTION: A cylindrical corrugate tube 1 covering an electric wire includes a cornice part 10 and a processing part 20. In the cornice part 10, annular protruding parts 11 and annular recessed parts 12 are alternately arranged along a longitudinal direction of the corrugate tube 1. The processing part 20 extends along the longitudinal direction of the corrugate tube 1. In the processing part 20, the annular protruding parts are crushed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a corrugated tube.

  Patent Document 1 discloses a corrugated tube having a flexible tube portion with low bending rigidity and a non-flexible tube portion with high bending rigidity.

JP 2013-243900 A

  In the corrugated tube described in Patent Document 1, in order to change the length and position of the non-flexible tube portion, it is necessary to change the mold for producing the corrugated tube. Therefore, it is not easy to change the length and position of the non-flexible tube portion.

  Then, this invention is made | formed in view of the above-mentioned point, and it aims at providing the technique which can change easily a part with high bending rigidity in a corrugated tube.

  The corrugated tube according to the first aspect is a cylindrical corrugated tube that covers an electric wire, and an accordion portion in which annular convex portions and annular concave portions are alternately arranged along the longitudinal direction of the corrugated tube; And a processing portion extending along the annular convex portion.

  The corrugated tube which concerns on a 2nd aspect is a corrugated tube which concerns on a 1st aspect, Comprising: The said process part exists so that it may make one round in the circumferential direction of the said corrugated tube.

  The corrugated tube which concerns on a 3rd aspect is a corrugated tube which concerns on any one of the 1st and 2nd aspect, Comprising: The said process part is linear form.

  The corrugated tube which concerns on a 4th aspect is a corrugated tube which concerns on any one of the 1st thru | or 3rd aspect, Comprising: The surface of the said process part is flatter than the surface of the said bellows part.

  The corrugated tube which concerns on a 5th aspect is a corrugated tube which concerns on any one of the 1st thru | or 4th aspect, Comprising: The thickness of the said process part is larger than the thickness of the said bellows part.

  The wire harness which concerns on a 6th aspect is provided with the corrugated tube which concerns on any one of the 1st thru | or 5th aspect, and the electric wire covered with the said corrugated tube.

  A processing method for a corrugated tube according to a seventh aspect is a processing method for a corrugated tube having a bellows portion in which annular convex portions and annular concave portions are alternately arranged along the longitudinal direction, and is along the longitudinal direction of the corrugated tube. In a state where the processing target portion extending along the longitudinal direction is heated, the annular convex portion of the processing target portion is crushed to form a processing portion.

  The processing method of the corrugated tube according to the eighth aspect is the processing method of the corrugated tube according to the seventh aspect, wherein the processing portion is in a state where the processing target portion is heated and the annular shape of the processing target portion is It is formed by crushing the convex part.

  The corrugated tube processing method according to a ninth aspect is the corrugated tube processing method according to the seventh aspect, wherein the processing unit is configured to move the processing target portion in the longitudinal direction while the processing target portion is heated. It is formed by stretching along the direction.

  A processing method for a corrugated tube according to a tenth aspect is a processing method for a corrugated tube according to any one of the seventh to ninth aspects, wherein the portion to be processed is one round in the circumferential direction of the corrugated tube. To exist.

  A corrugated tube processing method according to an eleventh aspect is a corrugated tube processing method according to any one of the seventh to tenth aspects, wherein the processing portion maintains the processing target portion in a straight line. However, the annular convex portion of the portion to be processed is crushed and formed in a heated state.

  According to the 1st thru | or 11th aspect, in a corrugated tube, the one part path | route of the wire harness with which the electric wire was covered with the corrugated tube is maintained using the part which the bending rigidity was high and the cyclic | annular convex part was crushed. be able to. Furthermore, in the corrugated tube, by changing the portion that crushes the annular convex portion, it is possible to easily change the portion of the corrugated tube that has high bending rigidity.

  In particular, according to the second and tenth aspects, in the corrugated tube, the bending rigidity of the portion where the annular convex portion is crushed can be further increased.

  In particular, according to the seventh to eleventh aspects, since the annular convex portion of the processing target portion is crushed while the processing target portion is heated, the annular convex portion of the processing target portion can be easily crushed.

  In particular, according to the eighth aspect, since the annular convex portion of the processing target portion is crushed while the processing target portion is heated, the thickness of the portion of the corrugated tube where the annular convex portion is crushed can be increased. . Therefore, in the corrugated tube, the bending rigidity of the portion where the annular convex portion is crushed can be further increased.

It is a side view which shows an example of a corrugated tube. It is a side view which shows an example of a wire harness. It is a side view which shows an example of a wire harness. It is a side view which shows an example of a corrugated tube. It is a figure which shows an example of the processing method of a corrugated tube. It is a figure which shows an example of the processing method of a corrugated tube. It is a figure which shows an example of the processing method of a corrugated tube. It is a figure which shows an example of the processing method of a corrugated tube. It is a figure which shows an example of the processing method of a corrugated tube.

<About the configuration of the corrugated tube>
FIG. 1 is a side view showing an example of a corrugated tube 1. The corrugated tube 1 is a cylindrical member, and is formed of, for example, a resin. As a material of the corrugated tube 1, for example, polyamide (PA), polypropylene (PP), flame retardant polypropylene, or the like is employed. As shown in FIG. 1, the corrugated tube 1 includes a bellows portion 10. In the bellows portion 10, the annular convex portions 11 and the annular concave portions 12 are alternately arranged along the longitudinal direction of the corrugated tube 1. It can be said that the longitudinal direction of the corrugated tube 1 is the extending direction of the corrugated tube 1.

  The annular convex portion 11 is a portion that is annularly convex when viewed from the outer peripheral side of the corrugated tube 1. When viewed from the inner peripheral side of the corrugated tube 1, this portion has an annular recess shape. The annular recess 12 is a portion that is annularly concave when viewed from the outer peripheral side of the corrugated tube 1. When viewed from the inner peripheral side of the corrugated tube 1, this portion has an annular convex shape. Since the bellows portion 10 is easily elastically deformed at a step portion between the annular convex portion 11 and the annular concave portion 12, the bellows portion 10 has a property of being easily bent and deformed. That is, the bellows portion 10 has low bending rigidity and is easily bent.

  The corrugated tube 1 includes a processing portion 20 that is adjacent to the bellows portion 10 in the longitudinal direction and extends along the longitudinal direction. The processing portion 20 is originally the bellows portion 10 and is a portion obtained by processing the bellows portion 10 so that the annular convex portion 11 is crushed. Since the processed portion 20 is a portion where the annular convex portion 11 is crushed, the processed portion 20 has higher bending rigidity and is less likely to bend than the bellows portion 10. Further, since the processed portion 20 is a portion where the annular convex portion 11 is crushed, the surface (outer peripheral surface) of the processed portion 20 is formed to be flatter than the surface (outer peripheral surface) of the serpentine portion 10. In this example, the processed portion 20 has a linear shape along the longitudinal direction of the corrugated tube 1. Moreover, the process part 20 exists so that it may make one round in the circumferential direction of the corrugated tube 1, for example.

  In FIG. 1, the outer peripheral surface of the processed portion 20 is flat, but the annular convex portion 11 may not be completely crushed, and the outer peripheral surface of the processed portion 20 may be uneven.

<About wire harness configuration>
FIG. 2 is a side view showing an example of a wire harness 100 in which an electric wire is covered with the corrugated tube 1 shown in FIG. In the wire harness 100 shown in FIG. 2, an electric wire bundle 50 composed of a plurality of electric wires is inserted into the corrugated tube 1. Thereby, the corrugated tube 1 has covered the electric wire bundle 50 in the circumferential direction. The electric wire bundle 50 includes, for example, electric wires through which a high voltage flows. The corrugated tube 1 may cover only one electric wire, not the electric wire bundle 50.

  For example, the wire harness 100 is disposed under the floor of a vehicle such as an automobile. The wire harness 100 electrically connects a plurality of electrical devices in the vehicle. The arrangement place of the wire harness 100 is not limited to the under floor of the vehicle.

  In the wire harness 100, the bending rigidity of the bellows portion 10 of the corrugated tube 1 is low. Therefore, as shown in FIG. 2, the wire harness 100 may be arranged in the vehicle in a state bent at the bellows portion 10. In the wire harness 100, the bellows part 10 is provided in the part arrange | positioned in the bent state.

  Further, since the processed portion 20 of the corrugated tube 1 has high bending rigidity, the route of the wire harness 100 can be maintained by the processed portion 20. In the wire harness 100, the processing part 20 is provided in the part which wants to perform path | route maintenance. In this example, since the processing unit 20 is straight, a part of the path of the wire harness 100 can be kept linear.

  The wire harness 100 does not necessarily have to be bent at the bellows portion 10. Further, as shown in FIG. 3, the corrugated tube 1 may be provided with a plurality of processed portions 20 that are arranged apart from each other in the longitudinal direction. Further, as shown in FIG. 4, the processing unit 20 may not exist so as to make one round in the circumferential direction of the corrugated tube 1. In this case, an incomplete bellows portion 500 is formed adjacent to the processed portion 20 in the circumferential direction of the corrugated tube 1. In the incomplete bellows portion 500, non-annular convex portions 510 and non-annular concave portions 520 are alternately arranged along the longitudinal direction of the corrugated tube 1. When the processing unit 20 does not exist so as to make one round in the circumferential direction of the corrugated tube 1, the processing unit 20 may be a linear portion that extends along the longitudinal direction of the corrugated tube 1.

  As described above, the corrugated tube 1 includes the processed portion 20 having a higher bending rigidity than the bellows portion 10 and having the annular convex portion 11 collapsed. Therefore, a part of the path of the wire harness 100 in which the electric wire is covered with the corrugated tube 1 can be maintained by using the processed portion 20.

  Moreover, in the corrugated tube 1, the position and length of a part with high bending rigidity can be easily changed by changing the part which crushes the annular convex part 11. FIG. That is, by processing the corrugated tube 1 having the same structure, a plurality of types of corrugated tubes 1 having different bending rigidity can be obtained. Therefore, even when the layout of the wire harness 100 is different depending on the vehicle or the like, it is not necessary to prepare a plurality of types of molds for manufacturing the corrugated tube 1, and it easily corresponds to the plurality of types of layouts of the wire harness 100. be able to. Further, in the corrugated tube 1, the range of the portion with high bending rigidity can be easily finely adjusted.

  Further, as shown in FIG. 1, when the processed portion 20 exists so as to make one turn in the circumferential direction of the corrugated tube 1, the bending rigidity of the processed portion 20 can be further increased. Therefore, a part of the path of the wire harness 100 can be more reliably maintained.

<Corrugated tube processing method>
Next, an example of a method of processing the corrugated tube 1 and forming the processed portion 20 on the corrugated tube 1 will be described. FIG. 5 is a diagram illustrating an example of a processing method of the corrugated tube 1.

  First, the corrugated tube 1 in which the bellows part 10 is formed from one end to the other end, that is, the corrugated tube 1 before processing is prepared.

  Next, in a state where the processing target portion 200 of the corrugated tube 1 is heated and softened, the annular convex portion 11 of the processing target portion 200 is crushed. Thereby, the process part 20 which the annular convex part 11 crushed in the process target part 200 is formed.

  When forming the processing portion 20 shown in FIG. 1 on the corrugated tube 1, for example, as shown in FIG. 5, the entire periphery of the processing target portion 200 is heated while maintaining the processing target portion 200 in a straight line. In this state, the entire periphery of the processing target portion 200 is pressurized. For example, as shown in FIGS. 6 and 7, a pair of heated molds 300 hold the processing target portion 200 for a certain period of time so as to cover the entire periphery of the processing target portion 200, thereby processing the processing target portion. The entire periphery of the processing target portion 200 can be pressurized while the entire periphery of the processing target portion 200 is heated while maintaining 200 in a straight line. Thereby, in the state which the process target part 200 became soft by heating, the process target part 200 is pressed and the annular convex part 11 of the process target part 200 is crushed. When a pair of molds 300 is used, a rod-like hard core material 350 is inserted into the processing target portion 200 as shown in FIG. 7 so that the inner shape of the processing target portion 200 does not collapse. In the state, the pair of molds 300 holds the portion 200 to be processed. FIG. 7 shows a state in which the configuration shown in FIG. 6 is viewed from the longitudinal direction of the corrugated tube 1.

  After the part 200 to be processed is held for a certain time by the pair of heated molds 300, the pair of molds 300 are separated from each other, and the processing for the part 200 to be processed is completed. After the pair of heated molds 300 holds the part 200 to be processed for a certain period of time, the heating of the pair of molds 300 is finished, and after a certain period of time, the pair of molds 300 may be separated from each other. Good.

  When a plurality of processed portions 20 are formed in the corrugated tube 1, each of the plurality of processing target portions 200 of the corrugated tube 1 is processed in the same manner as described above.

  As described above, when the processed portion 20 is formed by crushing the annular convex portion 11 of the processing target portion 200 with pressure, the step portion between the annular convex portion 11 and the annular concave portion 12 is formed in the processing target portion 200. Spreading in the longitudinal direction of the corrugated tube 1, the annular convex portion 11 is crushed so as to overlap the annular concave portion 12. Therefore, the thickness (wall thickness) of the processed portion 20 is larger than the thickness (wall thickness) of the bellows portion 10. That is, the thickness of the processed portion 20 is larger than the thickness of the annular convex portion 11 and the thickness of the annular concave portion 12. As the force for crushing the annular convex portion 11 of the processing target portion 200 is increased, the thickness of the processed portion 20 becomes thinner. Therefore, the thickness of the processed portion 20 is adjusted by adjusting the force for crushing the annular convex portion 11. Can do.

  When the force for crushing the annular protrusion 11 is small, the structure of the processed part 20 is a structure in which the collapsed annular protrusion 11 overlaps the annular recess 12, that is, the boundary between the collapsed annular protrusion 11 and the annular recess 12. It becomes a two-layer structure where exists. On the other hand, when the force which crushes the cyclic | annular convex part 11 is large, the structure of the process part 20 becomes a structure (one-layer structure) with which the crushed cyclic | annular convex part 11 was integrated with the cyclic | annular recessed part 12. FIG.

  In addition, you may crush the cyclic | annular convex part 11 of the process target part 200 by extending the process target part 200 along the longitudinal direction of the corrugated tube 1 in the state which heated the process target part 200 and was softened. For example, as illustrated in FIG. 8, in a state where the entire periphery of the processing target portion 200 is heated, both ends in the longitudinal direction of the processing target portion 200 are pulled along the longitudinal direction so as to be separated from each other. Thereby, the process target part 200 can be extended along the longitudinal direction of the corrugated tube 1 in a state where the entire periphery of the process target part 200 is heated and softened.

  When processing the processing target portion 200 as shown in FIG. 8, for example, as shown in FIG. 9, the bellows of the processing target portion 200 is performed by a pair of molds 400 similar to the pair of molds 300 described above. The portion 200 to be processed is sandwiched so as not to crush. In the corrugated tube 1, in a state where the outer vicinity of one end in the longitudinal direction of the processing target portion 200 and the outer vicinity of the other end in the longitudinal direction of the processing target portion 200 are respectively gripped by a pair of gripping members 410. The pair of gripping members 410 are moved along the longitudinal direction of the corrugated tube 1 so as to be separated from each other. Thereby, in the state which heated the whole periphery of the process target part 200, the both ends of the longitudinal direction of the process target part 200 can be pulled along the said longitudinal direction so that it may mutually leave | separate. Instead of moving each of the pair of gripping members 410, the position of one gripping member 410 may be fixed and the other gripping member 410 may be moved.

  In the above example, the annular convex portion 11 of the processing target portion 200 is crushed while the processing target portion 200 is heated. After the processing target portion 200 is heated for a certain period of time, the processing target portion 200 is soft. You may crush the annular convex part 11 of the process target part 200. FIG. Moreover, you may heat the process target part 200 by methods other than the method of heating the process target part 200 using the heated metal mold | die.

  As described above, in the processing method of the corrugated tube 1 according to this example, the annular convex portion 11 of the processing target portion 200 is crushed. In the corrugated tube 1, the portion where the annular convex portion 11 is crushed has high bending rigidity. Therefore, in the corrugated tube 1, a part of the path of the wire harness 100 can be maintained by using a portion where the annular protrusion 11 is crushed.

  Further, in the corrugated tube 1, by changing the portion that crushes the annular protrusion 11, it is possible to easily change the portion of the corrugated tube 1 that has high bending rigidity.

  In addition, as described above, in a state where the processing target portion 200 is heated and softened, the annular convex portion 11 of the processing target portion 200 can be easily crushed by crushing the annular convex portion 11 of the processing target portion 200. Therefore, processing of the processing target portion 200 is facilitated.

  Further, in the processing method shown in FIGS. 8 and 9 described above, since the processing target portion 200 is stretched along the longitudinal direction, the portion where the annular convex portion 11 is crushed, that is, the processing portion 20 may be thin. There is. On the other hand, in the processing method shown in FIGS. 5 to 7 described above, since the annular convex portion 11 of the processing target portion 200 is crushed, the thickness of the processing portion 20 is made larger than that in the processing methods shown in FIGS. Can be bigger. Therefore, the bending rigidity of the process part 20 can be made higher by employ | adopting the processing method shown by FIGS. As a result, a part of the path of the wire harness 100 can be more reliably maintained.

  In the above example, the processing unit 20 is linear, but may be curved. For example, by curving the annular convex portion 11 of the processing target portion 200 while bending the processing target portion 200 into a desired shape and softening the processing target portion 200, the curved processing portion 20 is obtained. Can do. By providing the corrugated tube 1 with the curved processing portion 20, a part of the path of the wire harness 100 can be maintained in a curved shape.

  Further, a corrugated tube as described in Patent Document 1, that is, a corrugated tube having a flexible tube portion and a non-flexible tube portion, is crushed and the processed portion 20 is formed by crushing an annular convex portion of the flexible tube portion. May be.

  As mentioned above, although the corrugated tube 1 and the wire harness 100 were demonstrated in detail, above-described description is an illustration in all the aspects, Comprising: This invention is not limited to it. The various modifications described above can be applied in combination as long as they do not contradict each other. And it is understood that the countless modification which is not illustrated can be assumed without deviating from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Corrugated tube 10 Bellows part 20 Process part 50 Wire bundle 100 Wire harness 200 Processed part

Claims (11)

A cylindrical corrugated tube covering the electric wire,
A bellows portion in which annular convex portions and annular concave portions are alternately arranged along the longitudinal direction of the corrugated tube;
A corrugated tube comprising: a processed portion extending along the longitudinal direction and having a collapsed annular convex portion. The corrugated tube according to claim 1,
The said process part is a corrugated tube which exists so that it may make one round in the circumferential direction of the said corrugated tube. The corrugated tube according to any one of claims 1 and 2,
The said process part is a corrugated tube which is linear form. The corrugated tube according to any one of claims 1 to 3,
The surface of the processed part is a corrugated tube that is flatter than the surface of the bellows part. The corrugated tube according to any one of claims 1 to 4,
The thickness of the said process part is a corrugated tube larger than the thickness of the said bellows part. The corrugated tube according to any one of claims 1 to 5,
A wire harness comprising an electric wire covered with the corrugated tube. A method for processing a corrugated tube having a bellows portion in which annular convex portions and annular concave portions are alternately arranged along the longitudinal direction,
A part along the longitudinal direction of the corrugated tube, and in a state where the part to be processed extending along the longitudinal direction is heated, the annular convex part of the part to be processed is crushed to form a processed part. , Corrugated tube processing method. It is a processing method of the corrugated tube according to claim 7,
The said process part is a processing method of a corrugated tube formed by crushing the said cyclic | annular convex part of the said process target part in the state which heated the said process target part. It is a processing method of the corrugated tube according to claim 7,
The said process part is a processing method of a corrugated tube formed by extending the said process target part along the said longitudinal direction in the state which heated the said process target part. A method for processing a corrugated tube according to any one of claims 7 to 9,
The method for processing a corrugated tube, wherein the portion to be processed exists so as to make a round in the circumferential direction of the corrugated tube. A method for processing a corrugated tube according to any one of claims 7 to 10,
The processing part is a processing method for a corrugated tube, wherein the processing part is formed by crushing the annular convex part of the processing target part in a heated state while maintaining the processing target part in a straight line.

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