JP2014087098A - Corrugated tube and wiring harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated tube capable of specifying the bending position and direction.SOLUTION: A corrugated tube 1 includes a bellows structure having normal portions 11 formed by arranging a plurality of projecting bars 5 having a constant width in the circumferential direction and recessed grooves 6 between the projecting bars 5 in parallel in a peripheral wall part 4 at an equal interval pitch in the longitudinal direction. A pitch between one projecting bar 5A and the recessed groove 6 in the cross sectional direction and a pitch between the other projecting bar 5A and the recessed groove 6 are different from each other. A bending specified portion 12 formed so that the pitch between the other projecting bar 5A and the recessed groove 6 in the cross sectional direction becomes smaller than that of the normal portions 11 is provided between the normal portions 11 or adjacently to the normal portions 11.

Description

  The present invention relates to a corrugated tube which is an exterior member of a wire harness and a wire harness in which the corrugated tube is extrapolated.

  Conventionally, a wire harness having a corrugated tube is used as a member for electrically connecting a battery and an inverter unit, for example, in a hybrid vehicle or an electric vehicle.

  For example, as shown in FIG. 3, the corrugated tube 2 is made of synthetic resin as a material, and the convex ridges 5 and the concave grooves 6 in the circumferential direction of the peripheral wall portion 4 from one end portion 7 to the other end portion 8 are arranged in the tube longitudinal direction. A plurality of them are alternately formed in parallel at an equal pitch.

JP 2009-183013 A

  However, this corrugated tube 2 has, for example, a bellows structure with irregularities at equal intervals, and has a structure that bends in all directions with respect to the circumferential direction. When used, there were problems such as twisting and ridges being crushed and whitening.

  The present invention aims to solve the above problems. That is, an object of the present invention is to provide a corrugated tube capable of defining the bending position and direction and a wire harness using the corrugated tube.

The invention according to claim 1 of the present invention, which has been made to solve the above problems,
The peripheral wall portion 4 is provided with a bellows structure having a normal portion 11 in which a plurality of ridges 5 having a constant width in the circumferential direction and concave grooves 6 between the ridges 5 are arranged in parallel at equal intervals in the longitudinal direction. In the corrugated tube 1,
The pitch of the one protrusion 5A and the groove 6 in the cross-sectional direction is different from the pitch of the other protrusion 5A and the groove 6 in the cross-section, and the pitch of the other protrusion 5A and the groove 6 in the cross-section is A bending defining portion 12 formed to be smaller than the pitch of the normal portion 11 is provided between the normal portions 11 or adjacent to the normal portion 11.

  The invention according to claim 2 of the present invention, which has been made to solve the above-mentioned problems, is the corrugated tube according to claim 1, wherein the bending defining portion 12 is the convex strip 5A of the other 12B in the cross-sectional direction. The width d2 is smaller than the width d1 of the ridge 5 of the normal portion 11 and is tapered.

  The wire harness of the invention according to claim 3 of the present invention made to solve the above-mentioned problems is characterized in that the corrugated tube according to claim 1 or 2 is sheathed.

  According to the first aspect of the present invention, the pitch of the one ridge and the groove in the cross-sectional direction is different from the pitch of the other ridge and the groove, and the pitch of the other ridge and the groove in the cross-section direction. However, since the bending defining portion formed so as to be smaller than the pitch of the normal portion is provided between or adjacent to the normal portion, it bends to the side where the curvature decreases when bent, and the bending position and bending Direction is defined.

  According to invention of Claim 2, since the width | variety of the protruding item | line on the side in which a curvature becomes small is set smaller than the width | variety of the said protruding item | line of a normal part, the bending prescription | regulation part becomes extremely when bent. Whitening is suppressed because stress is reduced.

  According to invention of Claim 3, the wire harness by which the corrugated tube was armored can be processed easily by a bending regulation part.

The corrugated tube which concerns on 1st one Embodiment of this invention is shown, (a) is a front view, (b) is sectional drawing, (c) is sectional drawing at the time of bending. It is a front view which shows the wire harness using the corrugated tube of FIG. The corrugated tube which concerns on the 2nd Embodiment of this invention is shown, (a) is a front view, (b) is a cross-sectional schematic diagram. It is a front view which shows the structural example of an example of the conventional corrugated tube.

  Hereinafter, the corrugated tube of embodiment of this invention is demonstrated with reference to FIGS. 1-2.

(First embodiment)
FIG. 1 shows a corrugated tube according to an embodiment of the present invention, in which (a) is a front view, (b) is a partial sectional view, and (c) is a partial sectional view when bent.

  The corrugated tube 1 according to the first embodiment of the present invention is a cylindrical body whose cross section (transverse cross section) perpendicular to the axial direction is made of a synthetic resin having flexibility or the like as a material. As shown in FIG. 1, the corrugated tube 1 includes a normal portion 11 in which circumferential ridges 5 and grooves 6 are alternately formed in parallel at an equal pitch along the axial direction on the peripheral wall portion 4. The bending defining portions 12 having different pitches of the one ridge 5A and the groove 6 in the cross-sectional direction and the pitch of the other ridge 5A and the groove 6 are provided between the normal portions 11 or adjacent to the normal portion 11. A bellows structure.

  As shown in FIGS. 1 (a) and 1 (b), in the bending defining portion 12, the width (d3 ≧ d1) of the ridge 5A is large when bent from the side (one in the cross-sectional direction) 12A. The taper is gradually tapered toward the smaller side (the other in the cross-sectional direction) 12B, and when bent, the pitch of the convex strips 5A and the concave grooves 6 on the small curvature side (the other in the cross-sectional direction) 12B It is formed so as to be smaller than the pitch of the grooves 6. In addition, the ridge 5A on the side 12B having a smaller curvature when bent (the other in the cross-sectional direction) 12A has a width d2 set smaller than a width d1 of the ridge 5 of the normal portion 11, and is formed in a tapered shape. Accordingly, the ridge 5A of the bending defining portion 12 is formed to be inclined toward the bending direction line (arrow).

  Further, as shown in FIG. 1 (c), when the corrugated tube 1 is bent as indicated by a bending direction line (arrow), the protruding strip 5A on the side (the other in the cross-sectional direction) 12B having a smaller curvature approaches and bends. And the convex strip 5A on the side with the larger curvature (one in the cross-sectional direction) 12A is stretched.

  Thereby, when the corrugated tube 1 is bent, the bending direction and the bending position are defined by the bending defining portion.

  Further, since the protruding ridge 5A on the side where the curvature is reduced when bent, it is formed in a tapered shape in advance, so that even if the ridges 5A come into contact with each other when bent, stress does not increase locally and whitening is suppressed. The

  FIG. 2 shows a state in which the corrugated tube 1 inserted through the wire harness 11 is bent by a pipe bender or the like at a bending defining portion 12. Since the corrugated tube 1 has the bending defining portion 12, the bending direction and the bending position are defined by the bending defining portion 12. Therefore, when the wire harness is routed, the bend defining portion 12 is preliminarily fitted to the place where the wire harness is to be bent, and the corrugated tube 1 is externally mounted on the wire harness 10, thereby arranging the wire harness 10 whose bending is defined by the bend defining portion 12. Can be searched.

  As mentioned above, according to this embodiment, the corrugated tube 1 becomes easy to bend | curve in the bending prescription | regulation part 11, and can define a bending position and a bending direction. Further, in the corrugated tube, the ridge 5A on the side where the curvature is reduced when it is bent is preliminarily formed in the bending defining portion 12 and the tapered portion is extended, so that stress is extremely reduced when it is bent. Therefore, whitening is suppressed.

  In addition, the wire harness with the corrugated tube 1 sheathed can be easily bent by a pipe bender or the like, with the bending direction and the bending position being defined by the bending defining portion 11 of the corrugated tube 1.

(Second Embodiment)
FIG. 3 shows a corrugated tube according to a second embodiment of the present invention, wherein (a) is a front view and (b) is a schematic cross-sectional view. In the second embodiment, in the bending defining portion 12, the protrusion 5 </ b> A and the concave portion are bent halfway from the side 12 </ b> A having a large curvature (one in the cross-sectional direction) 12 </ b> A when bent to the side 12 </ b> B having the small curvature (the other in the cross-sectional direction). The groove 6 has the same shape and the same pitch as the ridges 5 and the groove of the normal portion 11, and from the middle to the side 12B having the smaller curvature when bent (the other in the cross-sectional direction), the first embodiment shown in FIG. It is the same composition as. Therefore. Also in this case, the corrugated tube 1 is easy to bend at the bending defining portion 11 and can define the bending position and the bending direction. In the corrugated tube, the ridge 5A on the side where the curvature is reduced when it is bent is pre-tapered in the bending defining portion 12, and stress does not increase at the extreme even if they contact each other when bent. , Whitening is suppressed.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention. Of course, such modifications are included in the scope of the present invention as long as they have the configuration of the present invention.

DESCRIPTION OF SYMBOLS 1 Corrugated tube 4 Peripheral wall part 5, 5A Convex strip 6 Concave wall 10 Wire harness 11 Normal part 12 Bending regulation part

Claims (3)

In a corrugated tube having a bellows structure having a normal portion formed by arranging a plurality of circumferentially extending ridges and grooves between the ridges in parallel at equal intervals in the longitudinal direction on the peripheral wall portion,
The pitch of one ridge and groove in the cross-sectional direction is different from the pitch of the other ridge and groove in the other direction, and the pitch of the other ridge and groove in the cross-sectional direction is greater than the pitch of the normal portion. A corrugated tube characterized in that a bending defining portion formed to be small is provided between or adjacent to the normal portions.   The corrugated tube characterized in that the other ridge in the cross-sectional direction in the bending regulation portion has a width d2 smaller than a width d1 of the ridge in the normal portion and is tapered.   A corrugated tube according to claim 1 or 2, wherein the corrugated tube is sheathed.

Images