JP2015037333A - Corrugated tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock structure in which unlock due to bending deformation, and the like, of a corrugated tube is less likely to occur.SOLUTION: A corrugated tube 1 has a bellows structure where raised areas 2 and grooves 3 are arranged alternately. The first section raised area 4 of each raised areas 2 includes a pair of first partition walls each forming an angle of 90 degrees or less for the outer peripheral wall bending at a first end 101 and a first intermediate position P1. The second section raised area 5 of each raised areas 2 includes a pair of second partition walls each forming an angle of 90 degrees or less for the outer peripheral wall bending at a second end 102 and a second intermediate position P2. The second section raised area 5 is superposed on te inside of the first section raised area 4.

Description

  The present invention relates to a corrugated tube covering the periphery of a cable.

  2. Description of the Related Art Conventionally, a wire harness mounted on a vehicle such as an automobile often includes a corrugated tube as a protector covering the periphery of a cable such as an electric wire or an optical fiber cable. The corrugated tube has a bellows structure in which ridges and grooves along the circumferential direction are alternately formed on the outer circumferential surface in the axial direction.

  The corrugated tube has flexibility in the longitudinal direction by having a bellows structure. By covering the cable with the corrugated tube, the cable does not come into contact with surrounding members according to vibration or movement of the movable part, and durability is increased.

  Moreover, as shown in Patent Documents 1 and 2, the corrugated tube is usually formed with a series of cuts over the entire longitudinal direction thereof. That is, a general corrugated tube is a member formed in series from the first end to the second end in the circumferential direction.

  In this case, the cable is inserted into the corrugated tube from between both ends (cuts) of the corrugated tube. At that time, the corrugated tube is expanded to both sides of the cut using a dedicated jig, and the cable is inserted into the corrugated tube through the gap formed by the jig.

  The manufacturing process of the corrugated tube includes a step of continuously forming a tubular member having a bellows structure, and a step of forming a single cut in the tubular member. The tubular member having the bellows structure is continuously formed by, for example, a combination of extrusion molding and blow molding or vacuum molding.

  Moreover, the corrugated tube shown by patent document 1, 2 is equipped with the lock structure which maintains the said corrugated tube in a tubular shape, when the both ends in the circumferential direction mutually fit. The corrugated tube may be maintained in a tubular shape by winding an adhesive tape.

  For example, in the lock structure of the corrugated tube shown in Patent Document 1, one end of the raised portion is tapered in the circumferential direction, and the other end of the raised portion is along the circumferential direction. The width is formed to be thicker. Then, the tapered end portion is put on the outside of the tapered end portion.

  On the other hand, in the lock structure of the corrugated tube shown in Patent Document 2, both end portions of the raised portion are partitioned from other portions by walls, and one end portion is placed outside the other end portion.

JP 2003-79021 A JP 2012-5256 A

  The corrugated tube having the lock structure is effective in that the winding of the adhesive tape can be eliminated.

  The corrugated tube is easily subjected to a tensile force along the circumferential direction due to an external force applied to the cable passing through the corrugated tube or bending deformation. When the lock structure shown in Patent Document 1 receives a tensile force along the circumferential direction, one end of the taper is easily deformed in a direction in which the width is increased, and the other end of the taper is deformed in a direction in which the width is narrowed. It's easy to do. For this reason, in the lock structure disclosed in Patent Document 1, the lock is easily released due to the tensile force along the circumferential direction.

  On the other hand, in the lock structure shown in Patent Document 2, the walls at both ends of the raised portion form a large step. Therefore, in the lock structure shown in Patent Document 1, the lock is not easily released due to the tensile force along the circumferential direction.

  By the way, when the corrugated tube is bent in the longitudinal direction, depending on the relationship between the bending direction and the direction of the portion (both ends) of the lock structure, a force in the outer direction of the tube acts on the end overlapping the outside. In this case, in the conventional corrugated tube locking structure, the lock is likely to be released.

  An object of the present invention is to provide a lock structure in which when the corrugated tube has a lock structure for maintaining the tube in a tubular shape, the lock is less likely to be released due to bending deformation or the like of the tube.

The corrugated tube according to the first aspect is formed in a series from the first end portion in the circumferential direction to the second end portion, and the protruding portions and the groove portions along the circumferential direction are alternately arranged in the axial direction on the outer peripheral surface. It has a bellows structure. Furthermore, the corrugated tube which concerns on a 1st aspect is provided with each component shown below.
(1) A 1st component is a 1st division protrusion part. The first partition ridge is a portion extending from the circumferential first end to the first intermediate position near the first end in each of the ridges. The first partition ridge is formed from an outer peripheral surface at a curved first outer peripheral wall portion forming an outer peripheral surface from the first end portion to the first intermediate position, and at the first end portion and the first intermediate position. A pair of first partition walls partitioning to the depth of the bottom of the groove. The pair of first partition walls form an angle of 90 degrees or less with respect to the first outer peripheral wall.
(2) A 2nd component is a 2nd division protruding part. The second section raised portion is a portion extending from the second end portion in the circumferential direction in each of the raised portions to a second intermediate position near the second end portion. The second section bulge portion is curved from the outer peripheral surface at the curved second outer peripheral wall portion forming the outer peripheral surface from the second end portion to the second intermediate position, and at the second end portion and the second intermediate position. It partitions up to the depth of the bottom of the groove and forms an angle of 90 degrees or less with respect to the second outer peripheral wall. The second partition ridge is overlapped with the first partition ridge by being overlapped inside the first partition ridge to maintain the corrugated tube in a tubular shape.

  The corrugated tube according to the second aspect is an aspect of the corrugated tube according to the first aspect. The corrugated tube which concerns on a 2nd aspect WHEREIN: The space | interval of the said edge part by the side of the said groove part of a pair of said 1st partition part is an end of the said 2nd outer peripheral wall part from the said 2nd edge part side edge to the said 2nd intermediate position side edge. It is smaller than the width leading up to.

  The corrugated tube according to the third aspect is one aspect of the corrugated tube according to the first aspect or the second aspect. In the corrugated tube according to the third aspect, each of the first outer peripheral wall portion and the second outer peripheral wall portion is curved along an arc having a central angle of 90 degrees to 150 degrees.

  The corrugated tube according to the fourth aspect is an aspect of the corrugated tube according to any one of the first aspect to the third aspect. The corrugated tube which concerns on a 4th aspect WHEREIN: The part between the said 1st intermediate position and the said 2nd intermediate position of the circumferential direction in each said protruding part contains a some 3rd division protruding part. Each of the third partition ridges includes a pair of third partition walls partitioning from the outer peripheral surface to the depth of the bottom of the groove, and a portion between the pair of third partition walls.

  The corrugated tube according to the fifth aspect is one aspect of the corrugated tube according to the fourth aspect. The corrugated tube which concerns on a 5th aspect WHEREIN: The width | variety of the circumferential direction of each said 3rd division | segmentation protrusion part is smaller than the width | variety of the circumferential direction of the said 2nd division | segmentation protrusion part.

  In each of the above aspects, the first partition ridge and the second partition ridge overlapped on the inside form a lock structure that maintains the corrugated tube in a tubular shape.

  In the first partition ridges of each of the above aspects, the pair of first partition walls that divide the first partition ridges form an angle of 90 degrees or less with respect to the curved first outer peripheral wall that forms the outer peripheral surface. . In this case, the first section bulge portion forms a cavity whose width in the circumferential direction gradually narrows from the first outer peripheral wall portion side toward the inner side of the tube on the inner peripheral surface side thereof. That is, the inner cavity of the first section bulge portion has a narrower frontage than the width of the inner space when viewed from the inside of the corrugated tube.

  On the other hand, in the second partition ridges of each aspect described above, the pair of second partition walls that divide the second partition ridges are angles of 90 degrees or less with respect to the curved second outer peripheral wall portion that forms the outer peripheral surface. Is made. In this case, the second partition ridge forms a contour whose width in the circumferential direction gradually increases from the inside to the outside of the tube on the outer peripheral surface side. That is, the outer contour of the second section ridge is formed such that the top side (outer peripheral surface side) is wider than the root side.

  In the lock structure of each aspect described above, when the first partition ridge is about to be displaced to the outside of the pipe in a state where the second partition ridge is overlapped inside the first partition ridge, a pair of first partition walls Is easily caught on the pair of second partition walls. Therefore, even if a force in the outer direction of the tube acts on the first partition ridge due to the bending deformation of the corrugated tube, the first partition ridge covered with the second partition ridge is unlikely to come off from the second partition ridge. .

  Furthermore, in each of the above aspects, the pair of first partition walls and the pair of second partition walls form a large step from the outer peripheral surface to the depth of the bottom of the groove. Therefore, it is difficult for the lock to be released due to the tensile force along the circumferential direction.

  As described above, according to each aspect described above, in the corrugated tube having the lock structure, it is possible to make it difficult for the lock to be released due to the bending deformation or the like of the tube.

  In the second mode, the distance between the ends of the pair of first partition walls on the groove side is larger than the width from the end on the second end side to the end on the second intermediate position side in the second outer peripheral wall. small. That is, when viewed from the axial direction of the corrugated tube, the opening of the cavity inside the first partition ridge is narrower than the width of the top of the second partition ridge inserted into the cavity. In this case, it is possible to more reliably prevent the lock from being released due to bending deformation of the tube.

  In the third aspect, each of the first outer peripheral wall portion and the second outer peripheral wall portion is curved along an arc having a central angle of 90 degrees to 150 degrees. As a result of various studies, a corrugated tube having such a shape can be continuously formed using a mold.

  By the way, as will be described later, in order to continuously form a pair of the first partition wall and the second partition wall that form an angle of 90 degrees or less with respect to the outer peripheral wall, It is necessary to increase the distance between the partition ridges. In this case, in order to overlap the second compartment ridges on the inner side of the first compartment ridges, it is necessary to largely bend the portion of the corrugated tube between the first intermediate position and the second intermediate position in the circumferential direction. However, in the corrugated tube, it is difficult to bend the raised portion along the circumferential direction.

  4th aspect WHEREIN: The part between the circumferential direction 1st intermediate position and 2nd intermediate position in each protruding part contains several 3rd division protruding part. In this case, the part between each 3rd division protrusion part is easy to bend in the circumferential direction. Therefore, it becomes easy to greatly bend the portion between the first intermediate position and the second intermediate position in the corrugated tube in the circumferential direction. As a result, it becomes easy to overlap the second partition ridges on the inner side of the first partition ridges, that is, to cover the first partition ridges on the second partition ridges.

  Further, in the fifth aspect, the circumferential width of each of the third compartment ridges is smaller than the circumferential width of the second compartment ridges. Thus, if the width in the circumferential direction of each of the third partition ridges is small, the number of third partition ridges can be increased. As a result, it is possible to increase the number of easily bendable portions between the first intermediate position and the second intermediate position in the circumferential direction in each of the raised portions, and bend the portion between the first intermediate position and the second intermediate position. It becomes even easier. As a result, it becomes even easier to overlap the second compartment ridges on the inside of the first compartment ridges, that is, to cover the first compartment ridges on the second compartment ridges.

It is a perspective view of corrugated tube 1 concerning an embodiment. FIG. 3 is a cross-sectional view of the corrugated tube 1. FIG. 3 is a cross-sectional view of a first section raised portion of the corrugated tube 1. It is sectional drawing of the 2nd division protruding part of the corrugated tube. It is a perspective view of the corrugated tube 1 maintained tubular by the lock structure. It is a side view of the corrugated tube 1 maintained tubular by the lock structure. It is a cross-sectional view of the corrugated tube 1 in the middle of being deformed into a tubular shape. It is a cross-sectional view of the corrugated tube 1 maintained in a tubular shape by a lock structure. 1 is a perspective view of a tubular member that is a base of a corrugated tube 1. 3 is a cross-sectional view of a tubular member that is a base of the corrugated tube 1. FIG. It is a cross-sectional view of the tubular member from which the corrugated tube 1 is based and a mold for molding the tubular member.

  Hereinafter, embodiments will be described with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and is not an example of limiting the technical scope of the present invention.

<Corrugated tube structure>
First, the structure of the corrugated tube 1 according to the embodiment will be described with reference to FIGS. The corrugated tube 1 is a protector that covers the periphery of a cable such as an electric wire or an optical fiber cable in a wire harness mounted on a vehicle such as an automobile.

  The corrugated tube 1 has a bellows structure in which ridges 2 and grooves 3 along the circumferential direction are alternately arranged on the outer peripheral surface in the axial direction. The corrugated tube 1 is formed in a series from the first end portion 101 to the second end portion 102 in the circumferential direction so as to surround the hollow portion 104.

  2, 4, 7, and 8 show the corrugated tube 1 cut at the position of the raised portion 2.

  The corrugated tube has flexibility in the longitudinal direction by having a bellows structure. Since the corrugated tube 1 has a bellows structure, the raised portion 2 forms a recess on the inner surface, and the groove portion 3 is formed in a convex shape on the inner surface.

  The corrugated tube 1 is an integrally molded member of synthetic resin such as polyamide (PA), polypropylene (PP), polybutylene terephthalate (PBT), or ABS resin. The corrugated tube 1 is continuously molded by a combination of extrusion molding and blow molding or vacuum molding.

  The corrugated tube 1 has a relatively wide opening 103 between the first end 101 and the second end 102 in a natural state after molding. In the example shown in FIGS. 1 and 2, the width of the opening 103 between the first end portion 101 and the second end portion 102 in the corrugated tube 1 is approximately one half of the width of the corrugated tube 1. In this respect, the corrugated tube 1 is greatly different from the conventional corrugated tube formed by opposing both ends thereof through a very thin slit.

  A cable 9 such as an electric wire is inserted into the hollow portion 104 of the corrugated tube 1 from the opening 103. Therefore, in the process of inserting the cable 9 into the hollow portion 104 of the corrugated tube 1, a dedicated jig necessary for the conventional corrugated tube is not necessary.

  Each of the raised portions 2 of the corrugated tube 1 is divided into a plurality of portions in the circumferential direction by partition walls. More specifically, each raised portion 2 of the corrugated tube 1 includes a first compartment raised portion 4, a second compartment raised portion 5, and a third compartment raised portion 6. Each of the raised portions 2 of the corrugated tube 1 in the present embodiment includes a plurality of third section raised portions 6.

  The first partition ridge 4 is a portion extending from the circumferential first end 101 to the first intermediate position P1 near the first end 101 in each of the ridges 2. The first partition ridge 4 includes a curved first outer peripheral wall 41 and a pair of first partition walls 43. Further, the first partition raised portion 4 also includes a pair of first side wall portions 42 extending from edges on both sides of the first outer peripheral wall portion 41 to the bottom of the groove portion 3. In addition, a pair of 1st side wall part 42 is also a side wall of the groove part 3 between the two adjacent 1st division protruding parts 4. FIG.

  The 1st outer peripheral wall part 41 comprises the outer peripheral surface from the 1st end part 101 to the 1st intermediate position P1, and is a plate-shaped part curved in the circumferential direction. For example, as shown in FIG. 3, the first outer peripheral wall portion 41 is formed along an arc that forms any angle in the range where the central angle Q5 is 90 degrees or more and 150 degrees or less. In the example shown in FIG. 3, the first outer peripheral wall portion 41 is curved along an arc whose central angle Q5 forms 120 degrees.

  The pair of first partition walls 43 are plate-like portions that partition from the outer peripheral surface to the depth of the bottom of the groove 3 at the first end 101 and the first intermediate position P1. The pair of first partition walls 43 form angles Q1 and Q2 of 90 degrees or less with respect to the first outer peripheral wall 41, respectively.

  The angles Q1 and Q2 are within a range of, for example, not less than 80 degrees and not more than 90 degrees. The angles Q1 and Q2 are angles formed between the first outer peripheral wall portion 41 and each of the pair of first partition wall portions 43 in the local portions of the first end portion 101 and the first intermediate position P1. In other words, the angles Q1 and Q2 are angles formed between the tangent to the first outer peripheral wall portion 41 and the pair of first partition walls 43 at the first end portion 101 and the first intermediate position P1, respectively.

  In the example shown in FIG. 3, the first partition wall portion 41 includes the angle Q1 formed by the first partition wall portion 43a of the first end 101 with respect to the first outer peripheral wall portion 41 and the first partition wall portion 43b of the first intermediate position P1. The angles Q2 formed with respect to are respectively 90 degrees.

  In the corrugated tube 1, the first outer peripheral wall portion 41 is curved with the hollow portion 104 side inward. Therefore, even if the angles Q1 and Q2 are 90 degrees, when viewed in each of the first end portion 101 and the vicinity thereof, and the first intermediate position P1 and the vicinity thereof, the pair of first partition walls 43 Each of the first outer peripheral wall portions 41 can be regarded as having a substantially acute angle.

  The second partition ridge 5 is a portion extending from the circumferential second end 102 to the second intermediate position P2 near the second end 102 in each ridge 2. The second partition raised portion 5 includes a curved second outer peripheral wall portion 51 and a pair of second partition wall portions 53. Further, the second partition raised portion 5 also includes a pair of second side wall portions 52 that extend from edges on both sides of the second outer peripheral wall portion 51 to the bottom of the groove portion 3. In addition, a pair of 2nd side wall part 52 is also a side wall of the groove part 3 between the two adjacent 2nd division protrusion parts 5. FIG.

  The 2nd outer peripheral wall part 51 comprises the outer peripheral surface from the 2nd edge part 102 to the 2nd intermediate position P2, and is a plate-shaped part curved in the circumferential direction. For example, as shown in FIG. 4, the second outer peripheral wall portion 51 is formed along an arc that forms any angle in the range where the central angle Q6 is 90 degrees or more and 150 degrees or less. In the example shown in FIG. 4, the second outer peripheral wall portion 51 is curved along an arc whose central angle Q6 forms 100 degrees.

  The second outer peripheral wall 51 is curved along an arc having a radius smaller by the thickness of the first outer peripheral wall 41 than the radius of the arc along which the first outer peripheral wall 41 extends.

  The pair of second partition walls 53 are plate-like portions that partition from the outer peripheral surface to the depth of the bottom of the groove 3 at the second end 102 and the second intermediate position P2. The pair of second partition walls 53 form angles Q3 and Q4 of 90 degrees or less with respect to the second outer peripheral wall 51, respectively.

  The angles Q3 and Q4 are, for example, in the range of not less than 80 degrees and not more than 90 degrees. The angles Q3 and Q4 are angles formed between the second outer peripheral wall portion 51 and each of the pair of second partition wall portions 53 in the local portions of the second end portion 102 and the second intermediate position P2. In other words, the angles Q3 and Q4 are angles formed between the tangent line to the second outer peripheral wall portion 51 and the pair of second partition wall portions 53 at the second end portion 102 and the second intermediate position P2, respectively.

  In the example shown in FIG. 4, the angle Q3 formed by the second partition wall portion 53a of the second end portion 102 with respect to the second outer peripheral wall portion 51 and the second partition wall portion 53b of the second intermediate position P2 are the second outer peripheral wall portion 51. The angle Q4 formed with respect to is respectively 85 degrees.

  In addition, since the second outer peripheral wall portion 51 is curved, a pair of second partition wall portions can be seen in each of the second end portion 102 and the vicinity thereof, and the second intermediate position P2 and the vicinity thereof. Each of 53 will be in the state which can be considered that the angle of less than 85 degree | times is substantially formed with respect to the 2nd outer peripheral wall part 51.

  As shown in FIGS. 7 and 8, the second compartment ridge 5 is superimposed on the inside of the first compartment ridge 4 to engage with the first compartment ridge 4 to maintain the corrugated tube 1 in a tubular shape. In other words, the first partition ridge 4 is engaged with the second partition ridge 5 by being put on the second partition ridge 5, and maintains the corrugated tube 1 in a tubular shape.

  The first partition ridge 4 and the second partition ridge 5 are engaged with each other by being overlapped with the second partition ridge 5 inside, forming a lock structure that maintains the corrugated tube 1 in a tubular shape.

  In addition, the 2nd division | segmentation protrusion part 5 is accumulated on the inner side of the 1st division | segmentation protrusion part 4, the 1st division | segmentation protrusion part 4 is accumulated on the outer side of the 2nd division | segmentation protrusion part 5, Covering the two-section raised portion 5 is synonymous.

  Moreover, as FIG.3, 4 shows, the space | interval W1 of the edge by the side of the groove part 3 (inner side) of a pair of 1st partition part 43 is 2nd from the edge by the side of the 2nd end part 102 in the 2nd outer peripheral wall part 51. It is preferable to be smaller than the width W2 reaching the end on the intermediate position P2 side.

  The third section ridge 6 is formed between the first intermediate position P1 and the second intermediate position P2 in the circumferential direction of each ridge 2. Each of the third partition ridges 6 includes a third outer peripheral wall 61 and a pair of third partition walls 63. Further, each of the third partition ridges 6 also includes a pair of third side wall parts 62 extending from the edges on both sides of the third outer peripheral wall part 61 to the bottom of the groove part 3. In addition, a pair of 3rd side wall part 62 is also a side wall of the groove part 3 between the two adjacent 3rd division protruding parts 6. FIG.

  The third outer peripheral wall 61 is a plate-like portion that forms an outer peripheral surface in a part between the first intermediate position P1 and the second intermediate position P2, and is curved in the circumferential direction. For example, the third outer peripheral wall portion 61 is curved along an arc having the same radius as the arc along which the first outer peripheral wall portion 41 extends.

  The pair of third partition walls 63 are plate-like portions that partition from the outer peripheral surface to the bottom of the groove 3. For example, the pair of third partition walls 63 each form an obtuse angle with respect to the third outer peripheral wall 61.

  Between the first intermediate position P1 and the second intermediate position P2 in the circumferential direction in each of the ridges 2, the plurality of third partition ridges 6 are arranged in the state where the third partition walls 63 are adjacent to each other. It is formed side by side in the direction. In the present embodiment, four third partition ridges 6 are formed side by side in the circumferential direction between the first intermediate position P1 and the second intermediate position P2 in the circumferential direction of each ridge 2.

  As shown in FIG. 2, a first recessed portion 40 that divides the raised portion 2 in the circumferential direction is formed between the first divided raised portion 4 and the third divided raised portion 6 adjacent thereto. Similarly, the 2nd recessed part 50 which divides the protruding part 2 in the circumferential direction is formed between the 2nd division protruding part 5 and the 3rd division protruding part 6 adjacent to this.

  Furthermore, the 3rd recessed part 60 which divides the protruding part 2 in the circumferential direction between each of several 3rd division protruding parts 6 is formed. The bottoms of the first recess 40, the second recess 50, and the third recess 60 are formed flush with the bottom portion of the groove 3.

  As shown in FIGS. 2, 7, and 8, after the cable 9 is inserted from the opening 103 into the hollow portion 104, the first section ridge 4 and the second section ridge 5 separated through the opening 103 are mutually connected. They are brought close together and overlapped with the second section ridges 5 inside. When the first partition ridge 4 and the second partition ridge 5 are brought close to each other, the first recess 40, the second recess 50, and the third recess 60 are mainly bent.

<Corrugated tube forming method>
Next, a method for forming the corrugated tube 1 will be described with reference to FIGS. 9 and 10 are a perspective view and a cross-sectional view, respectively, of the tubular member 10 from which the corrugated tube 1 is based. FIG. 11 is a cross-sectional view of the tubular member 10 and a mold 8 for molding the tubular member 10.

  The tubular member 10 includes the corrugated tube 1, and a connecting portion 105 that connects the first partition wall portion 43 a of the first end portion 101 and the second partition wall portion 53 a of the second end portion 102 of the corrugated tube 1. The corrugated tube 1 is obtained by cutting the connecting portion 105 from the tubular member 10.

  Moreover, it is also conceivable that the remaining part of the connecting part 105 is cut off in a state where a part of the connecting part 105 connected to the first partition wall 43a remains. Thereby, distinction with the 1st division protrusion part 4 and the 2nd division protrusion part 5 becomes easy. The cut connecting portion 105 is reused as a raw material for a synthetic resin molding member.

  The tubular member 10 is obtained by performing blow molding or vacuum forming on a flat tubular member without unevenness that is continuously formed by extrusion molding.

  In blow molding or vacuum molding, a mold 8 as shown in FIG. 11 is used. Note that the sectional view of the tubular member 10 in FIG. 11 shows the tubular member 10 cut at the position of the raised portion 2 of the corrugated tube 1. Further, the cross-sectional view of the mold 8 in FIG. 11 shows the mold 8 cut at a position where the raised portion 2 of the tubular member 10 is formed.

  As shown in FIG. 11, the mold 8 includes a first mold 81 and a second mold 82 that are combined to face each other. The first mold 81 and the second mold 82 are moved together along the moving direction of a flat tubular member having no irregularities continuously formed by extrusion molding in a state of being combined with each other. Move in the direction of separation.

  Further, the plurality of sets of the first die 81 and the second die 82 are circulated and moved so that the new first die 81 and the second die 82 are sequentially formed into a tubular member having no irregularities from the extruded portion. Move to a continuously fed position. The plurality of sets of the first mold 81 and the second mold 82 are circulated and conveyed by a conveyance mechanism (not shown).

  The first mold 81 molds a portion of the tubular member 10 on the side including a part of the first partition ridge 4, a part of the second partition ridge 5, and the connecting part 105. The first mold 81 has a first molding surface 811, a second molding surface 812, a third molding surface 813, a fourth molding surface 814, and a fifth molding surface 815.

  In the first mold 81, the first molding surface 811 molds a part of the first outer peripheral wall 41 on the first end 101 side. The second molding surface 812 molds the first partition wall 43a of the first end 101. The third molding surface molds a part of the second outer peripheral wall portion 51 on the second end portion 102 side. The fourth molding surface 814 forms the second partition wall portion 53a of the second end portion 102. The fifth molding surface 815 molds the connecting portion 105.

  On the other hand, the second mold 82 includes a portion of the tubular member 10 including the remaining part of the first partition ridge 4, the remaining part of the second partition ridge 5, and all of the third partition ridge 6. Mold the part. The second mold 82 includes a first molding surface 821, a first molding projection 822, a second molding surface 823, a second molding projection 824, a plurality of third molding surfaces 825, and a plurality of third molding projections 826. Is formed.

  The first molding surface 811 molds a part of the first outer peripheral wall 41 on the first intermediate position P1 side. The first molding convex part 822 molds the first concave part 40. The second molding surface 823 molds a part of the second outer peripheral wall portion 51 on the second intermediate position P2 side. The second molding convex part 824 molds the second concave part 50. Each third molding surface 825 molds each third outer peripheral wall 61. Each of the third forming convex portions 826 forms the third concave portion 60.

  In the corrugated tube 1, each of the first outer peripheral wall portion 41 and the second outer peripheral wall portion 51 is formed with a wide width along an arc in which, for example, the central angles Q5 and Q6 form an angle of 90 degrees or more in the circumferential direction. ing. When the corrugated tube 1 having such a shape is molded, as shown in FIG. 11, one first partition wall portion 43 a is molded by the first mold 81 of the two molds combined to face each other, The other first partition wall portion 43 b can be formed with the second mold 82. As a result, the pair of first partition walls 43 can be formed so as to form angles Q1 and Q2 of 90 degrees or less with respect to the first outer peripheral wall 41, respectively.

  In other words, in order to form a pair of first partition walls 43 that form angles Q1 and Q2 of 90 degrees or less with respect to the first outer peripheral wall 41, each of the pair of first partition walls 43 faces each other. It is necessary to mold each of the two molds. Otherwise, the mold cannot be removed from the molded member.

  And in order to shape | mold each of a pair of 1st partition part 43 with each two metal mold | die which opposes, each of the 1st outer peripheral wall part 41 and the 2nd outer peripheral wall part 51 is made into center angle Q5, for example in the circumferential direction. It is necessary to make the width Q6 so wide as to follow an arc having an angle of 90 degrees or more and 150 degrees or less.

<Effect>
In the corrugated tube 1, the pair of first partition walls 43 that divide the first partition ridges 4 form an angle of 90 degrees or less with respect to the curved first outer peripheral wall 41 that forms the outer peripheral surface. In this case, the 1st division protrusion part 4 forms the cavity from which the width | variety of the circumferential direction becomes narrow gradually toward the inner side from the 1st outer peripheral wall part 41 side in the inner peripheral surface side. In other words, the cavity inside the first partition ridge 4 is narrower in the frontage (interval W1) than the width of the space on the back side when viewed from the inside of the corrugated tube 1.

  On the other hand, in the corrugated tube 1, the pair of second partition walls 53 that divide the second partition ridge 5 forms an angle of 90 degrees or less with respect to the curved second outer peripheral wall 51 that forms the outer peripheral surface. In this case, the 2nd division protrusion part 5 forms the outline which the width of the circumferential direction expands gradually toward the outer side from the inner side of a pipe | tube in the outer peripheral surface side. That is, the outer contour of the second section raised portion 5 is formed such that the width W2 on the top side (outer peripheral surface side) is wider than the width on the root portion side.

  In the lock structure of the corrugated tube 1, when the first partition ridge 4 is displaced outside the tube in a state where the second partition ridge 5 is overlapped inside the first partition ridge 4, a pair of first The partition wall 43 is easily caught on the pair of second partition walls 53. Therefore, even if a force in the outward direction of the tube acts on the first partition ridge 4 due to the bending deformation of the corrugated tube 1, the first partition ridge 4 covering the second partition ridge 5 is Difficult to come off from part 5

  Further, in the corrugated tube 1, the pair of first partition walls 43 and the pair of second partition walls 53 form a large step from the outer peripheral surface to the bottom depth of the groove 3. Therefore, it is difficult for the lock to be released due to the tensile force along the circumferential direction.

  As described above, in the corrugated tube 1 having the lock structure, the unlocking due to the bending deformation or the like of the corrugated tube 1 hardly occurs.

  Further, as described above, the interval W1 between the ends of the pair of first partition walls 43 on the groove 3 side is from the end on the second end 102 side to the end on the second intermediate position P2 side in the second outer peripheral wall. It is preferable that the width W2 is smaller. In this case, as viewed from the axial direction of the corrugated tube 1, the width of the front end of the cavity inside the first section ridge 4 (interval W1) is the top of the top of the second section ridge 5 inserted into the cavity. It is narrower than the width W2. In this case, it becomes possible to more reliably prevent unlocking due to bending deformation of the corrugated tube 1 or the like.

  In the corrugated tube 1, each of the first outer peripheral wall portion 41 and the second outer peripheral wall portion 51 is curved along an arc having a central angle of 90 degrees to 150 degrees. As a result of various studies, as described based on FIG. 11, the corrugated tube 1 having such a shape can be continuously formed using the mold 8.

  In addition, in order to continuously mold the pair of first partition wall portions 43 and second partition wall portions 53 that form an angle of 90 degrees or less with respect to the outer peripheral wall portions 41, 51 with the mold 8, It is necessary to increase the distance between the second partition ridges 5, that is, the width of the connecting portion 105. In this case, in order to overlap the second partition ridge 5 inside the first partition ridge 4, the portion of the corrugated tube 1 between the first intermediate position P1 and the second intermediate position P2 is largely bent in the circumferential direction. There is a need. However, in the corrugated tube 1, it is difficult to bend the raised portion 2 itself along the circumferential direction.

  In the corrugated tube 1, a portion between the first intermediate position P <b> 1 and the second intermediate position P <b> 2 in the circumferential direction in each of the raised portions 2 includes a plurality of third divided raised portions 6. In this case, the 3rd recessed part 60 between each 3rd division protruding part 6 tends to bend in the circumferential direction. Therefore, it becomes easy to greatly bend the portion of the corrugated tube 1 between the first intermediate position P1 and the second intermediate position P2 in the circumferential direction. As a result, it becomes easy to overlap the second partition ridges 5 on the inner side of the first partition ridges 4, that is, to cover the first partition ridges 4 on the second partition ridges 5.

  Further, in the corrugated tube 1, the circumferential width of each of the third divided raised portions 6 is smaller than the circumferential width of the second divided raised portions 5. The circumferential width of the second partition ridge 5 that can be overlapped inside the first partition ridge 4 is naturally smaller than the circumferential width of the first partition ridge 4.

  As described above, if the circumferential width of each of the third compartment ridges 6 is small, the number of the third compartment ridges 6 can be increased. As a result, it is possible to increase the number of easily bendable portions between the first intermediate position P1 and the second intermediate position P2 in the circumferential direction in each of the raised portions 2, and the first intermediate position P1 and the second intermediate position P2 It becomes easier to bend the portion in between. As a result, it becomes easier to overlap the second partition ridges 5 on the inner side of the first partition ridges 4, that is, to cover the first partition ridges 4 on the second partition ridges 5.

<Application example>
In the corrugated tube 1, two third partition ridges 6, three third partition ridges 6, or five or more thirds between the first intermediate position P <b> 1 and the second intermediate position P <b> 2 of each ridge 2. It is also conceivable that the partition ridges 6 are formed.

  The corrugated tube according to the present invention can be freely combined with the above-described embodiments and application examples within the scope of the invention described in each claim, or can be modified as appropriate. It is also possible to configure by omitting a part.

DESCRIPTION OF SYMBOLS 1 Corrugated tube 10 Tubular member 101 1st end part 102 2nd end part 103 Opening 104 Hollow part 105 Connection part 2 Raised part 3 Groove part 4 1st division raised part 40 1st recessed part 41 1st outer peripheral wall part 42 1st side wall part 43 a pair of first partition walls 43a a first partition wall portion at a first end 43b a first partition wall portion at a first intermediate position 5 a second partition raised portion 50 a second recess portion 51 a second outer peripheral wall portion 52 a second sidewall portion 53 a pair The second partition wall portion 53a The second partition wall portion 53b at the second end portion The second partition wall portion at the second intermediate position 6 The third partition raised portion 60 The third recess portion 61 The third outer peripheral wall portion 62 The third sidewall portion 63 The third partition wall Part 8 Mold 81 First mold 811 First molding surface of first mold 812 Second molding surface of first mold 813 Third molding surface of first mold 814 Fourth molding surface 815 of first mold Fifth molding surface of first mold 82 Second mold 821 Second First molding surface of mold 822 First molding convex part of second mold 823 Second molding surface of second mold 824 Second molding convex part of second mold 825 Third molding surface of second mold 826 Third molding convex part of second mold 9 Cable P1 First intermediate position P2 Second intermediate position

Claims (5)

A corrugated tube having a bellows structure formed in a series from the first end portion to the second end portion in the circumferential direction, and having raised portions and groove portions along the circumferential direction alternately arranged in the axial direction on the outer peripheral surface. And
A curve that extends from the first end portion in the circumferential direction to the first intermediate position near the first end portion, and forms an outer peripheral surface from the first end portion to the first intermediate position. A pair of first walls that partition from the outer peripheral surface to the bottom of the groove portion at the first outer peripheral wall portion, the first end portion, and the first intermediate position and that form an angle of 90 degrees or less with respect to the first outer peripheral wall portion, respectively. A first compartment ridge including a bulkhead;
A curve that extends from the second end portion in the circumferential direction to the second intermediate position near the second end portion in each of the raised portions, and forms a peripheral surface from the second end portion to the second intermediate position. A pair of second walls that partition from the outer peripheral surface to the bottom of the groove at the second outer peripheral wall portion, the second end portion, and the second intermediate position and that form an angle of 90 degrees or less with respect to the second outer peripheral wall portion, respectively. A corrugated tube comprising: a second partition ridge including a second partition wall and being overlapped with the first partition ridge by being overlapped with the first partition ridge to maintain the corrugated tube in a tubular shape. The corrugated tube according to claim 1,
The gap between the ends of the pair of first partition walls on the groove part side is smaller than the width from the second end part side end to the second intermediate position side end of the second outer peripheral wall part. tube. The corrugated tube according to claim 1 or 2,
Each of said 1st outer peripheral wall part and said 2nd outer peripheral wall part is a corrugated tube which curves along the circular arc which a center angle | corner forms 90 to 150 degree | times. The corrugated tube according to any one of claims 1 to 3,
The portions between the first intermediate position and the second intermediate position in the circumferential direction in each of the raised portions are respectively a pair of third partition portions and a pair of third partition portions that partition from the outer peripheral surface to the bottom of the groove portion. A corrugated tube comprising a plurality of third compartment ridges including a portion therebetween. The corrugated tube according to claim 4,
The corrugated tube in which the circumferential width of each of the third compartment ridges is smaller than the circumferential width of the second compartment ridges.

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