JP6137012B2 - Corrugated tube and wire module - Google Patents

Description

  The present invention relates to a corrugated tube that is sheathed on an electric wire disposed in a vehicle.

  A corrugated tube may be sheathed on an electric wire disposed in a vehicle. As such a corrugated tube, there exists a thing described in patent document 1, for example.

  Patent Document 1 discloses a synthetic resin pipe device in which an outer tube is inserted into an inner tube from the outside and covers a long slit of the inner tube as a technique capable of suppressing the jumping out of an electric wire from the slit. . Also, Patent Documents 2 to 6 disclose the same technique as Patent Document 1.

JP-A-63-140613 JP-A-11-325344 JP 2006-5982 A JP 2000-115942 A Japanese Utility Model Publication No. 6-24320 JP 2013-17318 A

  However, in the synthetic resin pipe device described in Patent Document 1, the width of the convex portion of the inner tube is narrower than the convex portion of the outer tube. For this reason, the moldability of the convex part of the inner tube deteriorates, and there is a possibility that the convex part of the inner pipe cannot be sufficiently fitted on the inner peripheral side of the convex part of the outer tube.

  Then, an object of this invention is to provide the technique which can improve the moldability of the convex part of an inner side pipe | tube.

  In order to solve the above-described problem, the corrugated tube according to the first aspect is a corrugated tube in which two corrugated tube main body portions are fitted, and is formed in a cylindrical shape, and the first annular convex portion along the axial direction thereof. The first annular recesses are alternately formed, and the inner corrugated tube main body portion is formed with a slit along the axial direction thereof, and is formed into a cylindrical shape. Two annular recesses are alternately formed, slits are formed along the axial direction thereof, and the outer corrugated tube main body can be fitted to the inner corrugated tube main body from the outer peripheral side. The first annular convex part includes a cover part covered with the second annular convex part, and the pitch of at least the cover part among the first annular convex parts in the axial direction is the second annular convex part. It is a multiple of the pitch.

  The corrugated tube which concerns on a 2nd aspect is a corrugated tube which concerns on a 1st aspect, Comprising: The said 1st cyclic | annular convex part is formed so that it may protrude outside the said cover part in radial direction. In the axial direction, the pitch of the rotation suppressing portion is equal to the pitch of the second annular convex portion.

  The corrugated tube which concerns on a 3rd aspect is a corrugated tube which concerns on the 1st or 2nd aspect, Comprising: The pitch of the said cover part of the said 1st annular convex part is the pitch of the said 2nd annular convex part in an axial direction. 2 times.

  The electric wire module which concerns on a 4th aspect is provided with the corrugated tube which concerns on any one 1st-3rd aspect, and the electric wire accommodated in the inside of the said inner corrugated tube main-body part of the said corrugated tube.

  According to the corrugated tube according to the first to third aspects, since the pitch of at least the cover portion of the first annular convex portion in the axial direction is a multiple of the pitch of the second annular convex portion, the inner corrugated by blow molding or the like. When creating the tube main body, the pressure easily reaches the tip of the first annular convex portion. As a result, the material can more reliably reach the tip of the first annular protrusion, and the moldability of the inner corrugated tube main body can be improved.

  In particular, according to the corrugated tube according to the second aspect, since the pitch of the rotation suppressing portion is equal to the pitch of the second annular convex portion in the axial direction, when the inner corrugated tube main body portion and the outer corrugated tube main body portion are fitted together Moreover, on the appearance, it appears that the annular convex portions and the annular concave portions are formed at a constant pitch along the axial direction. Thereby, the appearance of the corrugated tube can be improved.

  In particular, according to the corrugated tube according to the third aspect, since the pitch of the cover portion of the first annular convex portion is twice the pitch of the second annular convex portion in the axial direction, the ease of bending as the corrugated tube is maintained. It is possible to improve the moldability.

  According to the electric wire module according to the fourth aspect, since the pitch of at least the cover portion of the first annular convex portion in the axial direction is a multiple of the pitch of the second annular convex portion, the inner corrugated tube main body portion is formed by blow molding or the like. When creating the pressure, the pressure easily reaches the tip of the first annular convex portion. As a result, the material can more reliably reach the tip of the first annular protrusion, and the moldability of the inner corrugated tube main body can be improved.

It is a disassembled perspective view which shows the corrugated tube which concerns on embodiment. It is sectional drawing which cut | disconnected the corrugated tube which concerns on embodiment along the axial direction.

  Hereinafter, the corrugated tube 20 and the electric wire module 10 which concern on embodiment are demonstrated. FIG. 1 is an exploded perspective view showing a corrugated tube 20 according to the embodiment. FIG. 2 is a schematic cross-sectional view of the corrugated tube 20 according to the embodiment cut along the axial direction.

  The electric wire module 10 includes an electric wire 12 and a corrugated tube 20. The electric wire 12 is accommodated in an inner corrugated tube main body 30 described later in the corrugated tube 20.

  At least one electric wire 12 is included. The electric wire 12 is configured such that a covering portion is formed by extrusion coating of resin on the outer periphery of the core wire. Here, an example of an electric wire bundle in which a plurality of electric wires 12 are bundled will be described. An optical fiber or the like may be disposed along the electric wire 12 in the electric wire bundle. The electric wire 12 is used to electrically connect various electric devices mounted on a vehicle or the like in a state where the electric wire 12 is arranged at a location to be arranged on the vehicle or the like. In addition, in FIG.1 and FIG.2, the external shape of the bundled electric wire bundle is drawn.

  The corrugated tube 20 includes two corrugated tube main body portions 30 and 40 including an inner corrugated tube main body portion 30 and an outer corrugated tube main body portion 40, and the two corrugated tube main body portions 30 and 40 are fitted to each other.

  First, the overall image of the two corrugated tube main body portions 30 and 40 will be described.

  The inner corrugated tube main body 30 is formed in a cylindrical shape. The inner corrugated tube main body 30 has first annular convex portions 32 and first annular concave portions 36 formed alternately along the axial direction thereof. A slit 38 is formed in the inner corrugated tube main body 30 along the axial direction thereof. By splitting the inner corrugated tube main body 30 from the slit 38, the electric wires 12 can be accommodated therein.

  The outer corrugated tube main body 40 is formed in a cylindrical shape. The outer corrugated tube main body portion 40 has second annular convex portions 42 and second annular concave portions 46 formed alternately along the axial direction thereof. The outer corrugated tube main body 40 has a slit 48 formed along the axial direction thereof. The outer corrugated tube main body 40 can be fitted into the inner corrugated tube main body 30 from the outer peripheral side by accommodating the inner corrugated tube main body 30 therein through the slit 48.

  A surface connecting the outer surface and the inner surface is formed at the circumferential edge portion separated by the slit 48 in the second annular convex portion 42. Here, this surface is referred to as a partition wall 44.

  Such two corrugated tube main-body parts 30 and 40 are formed as follows, for example. The molten synthetic resin material is extruded into a cylindrical shape using an extrusion mold. The extruded cylindrical body is brought into close contact with the mold by blow molding or vacuum molding to form a shape along the mold. And the slit 38 (48) is formed by opening the obtained cylindrical body along the axial direction in a part in the circumferential direction. In this way, the inner corrugated tube main body 30 and the outer corrugated tube main body 40 are formed. In addition, when forming the slit 48 of the outer corrugated tube main-body part 40, a part of circumferential direction is cut off here by making a cut | interruption in two places in the circumferential direction. Thereby, the large opening 49 is formed in the outer corrugated tube main body portion 40 as compared with the case where the slit is formed by cutting only one place in the circumferential direction.

  Next, each part of two corrugated tube main-body parts 30 and 40 is demonstrated in detail.

  The first annular convex portion 32 includes a cover portion 33 in the circumferential direction. Further, here, the first annular convex portion 32 includes a rotation suppressing portion 34 in the circumferential direction.

  The covering portion 33 is a portion covered with the second annular convex portion 42 in a state where the outer corrugated tube main body portion 40 is fitted to the inner corrugated tube main body portion 30. The outer diameter of the cover portion 33 is set to be approximately the same as the inner diameter of the second annular convex portion 42. Thereby, the cover part 33 can be fitted inside the second annular convex part 42. And when the cover part 33 fits inside the 2nd annular convex part 42, the inner side corrugated tube main-body part 30 and the outer side corrugated tube main-body part 40 become difficult to shift | deviate to an axial direction, and will be in the state which both fitted. .

  The rotation suppressing part 34 is formed so as to protrude outward from the cover part 33 in the radial direction. The rotation suppression unit 34 suppresses the outer corrugated tube main body 40 from rotating in the circumferential direction with respect to the inner corrugated tube main body 30 in a state where the outer corrugated tube main body 40 is fitted to the inner corrugated tube main body 30. It is made possible.

  Specifically, the circumferential dimension of the rotation suppressing portion 34 is set to be approximately the same as the circumferential dimension of the slit 48 of the outer corrugated tube main body 40. Further, the outer diameter of the rotation suppressing portion 34 is set larger than the inner diameter of the second annular convex portion 42 of the outer corrugated tube main body portion 40 (here, the same as the outer diameter of the second annular convex portion 42). . Then, when the outer corrugated tube main body portion 40 is fitted to the inner corrugated tube main body portion 30, the rotation suppressing portion 34 is fitted so as to be positioned in the opening 49 by the slit 48 of the second annular convex portion 42. By these, in the state where the outer corrugated tube main body portion 40 was fitted to the inner corrugated tube main body portion 30, a force was applied to the inner corrugated tube main body portion 30 such that the outer corrugated tube main body portion 40 rotated in the circumferential direction. Even in this case, the circumferential edge portion of the second annular convex portion 42 contacts the circumferential edge portion of the rotation suppressing portion 34, and the outer corrugated tube body portion 40 rotates in the circumferential direction with respect to the inner corrugated tube body portion 30. Can be suppressed. This makes it difficult for the slit 38 of the inner corrugated tube main body 30 and the slit 48 of the outer corrugated tube main body 40 to overlap. For this reason, jumping out of the electric wire 12 from the slits 38 and 48 can be suppressed more reliably.

  Further, when the outer diameter of the rotation suppressing portion 34 is set to be approximately the same as the outer diameter of the second annular convex portion 42 of the outer corrugated tube main body portion 40, the outer corrugated tube main body portion 40 is connected to the inner corrugated tube main body portion 30. Since the outer peripheral surfaces of the annular convex portions coincide with each other in the fitted state, the fitted state becomes inconspicuous, and the appearance as a product can be improved.

  Further, the rotation suppressing portion 34 is formed at a position facing the slit 38 of the inner corrugated tube main body portion 30. Thereby, since the slit 48 of the outer corrugated tube main body portion 40 and the slit 38 of the inner corrugated tube main body portion 30 are positioned so as to face each other in the circumferential direction, the jumping out of the electric wire 12 from the slits 38 and 48 is suppressed. Can do.

  But it is not essential that the rotation suppression part 34 is formed, and the rotation suppression part 34 does not need to be formed. Further, even when the rotation suppressing portion 34 is formed, it is not essential that the rotation suppressing portion 34 is formed at a position facing the slit 38 of the inner corrugated tube main body portion 30, for example, the inner corrugated tube main body portion. It may be formed at a position separated from the thirty slits 38 by a quarter of the circumference. That is, in the state where the rotation suppressing portion 34 is located in the opening 49 by the slit 38 of the outer corrugated tube main body portion 40, the slit 48 of the outer corrugated tube main body portion 40 and the slit 38 of the inner corrugated tube main body portion 30 are in the circumferential direction. The rotation suppression part 34 should just be formed so that it may be located in the location away from.

  In the axial direction, the pitch of at least the cover portion 33 of the first annular convex portion 32 is formed so as to be a multiple of the pitch of the second annular convex portion 42.

  More specifically, here, the pitch of the cover 33 of the first annular protrusion 32 in the axial direction is twice the pitch of the second annular protrusion 42. Thereby, the 2nd annular convex part 42 contains the 2nd annular convex part 42 which fits in cover part 33, and the 2nd annular convex part 42 which does not fit in cover part 33, and both exist alternately in the direction of an axis. doing.

  However, it is not essential that the pitch of the cover portion 33 of the first annular convex portion 32 is twice the pitch of the second annular convex portion 42 in the axial direction. In the axial direction, the pitch of the cover portions 33 may be three times or more the pitch of the second annular convex portions 42. That is, the pitch of the cover 33 in the axial direction may be an integral multiple of twice or more the pitch of the second annular protrusion 42 so that the cover 33 can be fitted to the second annular protrusion 42 in all. .

  If the pitch of at least the cover portion 33 of the first annular convex portion 32 in the axial direction is a multiple of the pitch of the second annular convex portion 42, the inner corrugated tube main body portion 30 is formed by blow molding or the like. When creating, the pressure easily reaches the tip of the first annular convex portion 32. Thereby, the material can more reliably reach the tip of the first annular convex portion 32, and the moldability of the inner corrugated tube main body 30 can be improved. Thereby, since it becomes possible to manufacture the inner corrugated tube main body part 30 more easily, the cost relating to the manufacturing can be suppressed.

  Moreover, since the number of the cover parts 33 fitted to the 2nd annular convex part 42 reduces, it becomes easy to fit the outer corrugated tube main-body part 40 to the inner corrugated tube main-body part 30. FIG. Thereby, the efficiency of the operation | work which fits the outer corrugated tube main-body part 40 to the inner corrugated tube main-body part 30 can be improved.

  Moreover, when the predetermined cover part 33 is not fitted to the predetermined second annular convex part 42, for example, here, every second annular convex part 42 is fitted to the cover part 33 in the axial direction. In the case where this is fitted to the cover portion 33 every two pieces in the axial direction, the portion where the outer corrugated tube main body portion 40 is not properly fitted is more radially than the other portions where it is correctly fitted. Protruding. Thereby, it becomes easy to detect the part which the outside corrugated tube main-body part 40 does not fit correctly.

  Further, if the pitch of the first annular protrusions 32 is twice the pitch of the second annular protrusions 42 in the axial direction, the formability is improved while maintaining the ease of bending as the corrugated tube 20. be able to.

  Here, in the axial direction, the pitch of the rotation suppressing portion 34 is equal to the pitch of the second annular convex portion 42. Thereby, the rotation suppression part 34 contains the rotation suppression part 34 which continues to the cover part 33, and the rotation suppression part 34 which is not continued to the cover part 33, and both exist alternately in the axial direction.

  But it is not essential that the pitch of the rotation suppression part 34 is equal to the pitch of the 2nd annular convex part 42 in an axial direction. In the axial direction, the pitch of the rotation suppressing portion 34 may be a multiple of the pitch of the second annular convex portion 42. At this time, in the axial direction, the pitch of the rotation suppressing portion 34 and the pitch of the covering portion 33 may be equal, or one of them may be larger. However, when the pitch of the rotation restraining portions 34 in the axial direction is equal to the pitch of the second annular convex portions 42, all the second annular convex portions are in a state where the outer corrugated tube main body portion 40 is fitted to the inner corrugated tube main body portion 30. Since the rotation suppression part 34 is located in the circumferential opening 49 by the slit 48 with respect to the part 42, the fitting state becomes inconspicuous and the appearance as a product can be improved. Moreover, it can suppress that the partition part 44 of the 2nd annular convex part 42 is exposed outside, and interferes with another member.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Electric wire module 12 Electric wire 20 Corrugated tube 30 Inner corrugated tube main-body part 32 1st cyclic | annular convex part 33 Cover part 34 Rotation suppression part 36 1st cyclic | annular recessed part 38 Slit 40 Outer corrugated tube main-body part 42 2nd cyclic | annular convex part 44 Partition part 46 Second annular recess 48 Slit 49 Opening

Claims (4)

A corrugated tube in which two corrugated tube body parts fit together,
An inner corrugated tube main body portion that is formed in a cylindrical shape, and in which first annular convex portions and first annular concave portions are alternately formed along the axial direction, and slits are formed along the axial direction;
Formed in a cylindrical shape, second annular convex portions and second annular concave portions are alternately formed along the axial direction, and slits are formed along the axial direction. An outer corrugated tube body that can be fitted from the side,
With
In the circumferential direction, the first annular protrusion includes a cover covered with the second annular protrusion,
A corrugated tube in which, in the axial direction, at least the pitch of the cover portion of the first annular convex portions is a multiple of the pitch of the second annular convex portions. The corrugated tube according to claim 1,
The first annular convex portion further includes a rotation suppressing portion formed to protrude outward from the cover portion in the radial direction,
A corrugated tube in which the pitch of the rotation suppression portion is equal to the pitch of the second annular convex portion in the axial direction. The corrugated tube according to claim 1 or 2,
A corrugated tube in which the pitch of the cover portion of the first annular convex portion in the axial direction is twice the pitch of the second annular convex portion. The corrugated tube according to any one of claims 1 to 3,
An electric wire housed inside the inner corrugated tube main body of the corrugated tube;
An electric wire module.

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