WO2017018229A1 - Corrugated tube for wire harness - Google Patents

Abstract

The present invention prevents electric wires that are inside a corrugated tube from protruding from or catching in a slit in the corrugated tube. A resin corrugated tube wherein a circumferential wall that has annular mountain parts and valley parts provided thereto alternately in the length direction surrounds a wire harness insertion path and wherein a single slit is provided in the circumferential wall continuously in the axial direction. A bag body that is for filling a gap, that has a closed cross-sectional shape, and that has a circumferential wall that surrounds a hollow section and that comprises a flexible rubber, elastomer, or soft resin material is continuously housed in the length direction inside the wire harness insertion path, which is inside the main body of the corrugated tube and is surrounded by the circumferential wall of the corrugated tube, in a space that is sandwiched between an inner surface of the circumferential wall of the corrugated tube on the side to which the slit is provided and an electric wire group of a wire harness that is inserted through the wire harness insertion path, and the slit is blocked by the bag body.

Description

Corrugated tube for wire harness

The present invention relates to a corrugated tube for a wire harness, and more particularly, to a slit which is continuous in a lengthwise direction of the corrugated tube and which prevents the wire from being caught in the slit and the wire from coming out of the slit.

The wire harness installed in a car has a wire harness in a resin corrugated tube in order to protect the wire group against the outer members located around the focusing and the wiring of the wire group constituting the wire harness. It is often inserted. The corrugate tube is excellent in flexibility since circumferential ridges and valleys are alternately provided in the longitudinal direction, and compared with the case where the wire group is bound by tape winding according to the skill of the worker As well as there is no difference in quality, there is an advantage that wire groups can be bound and protected in a relatively short time. The corrugated tube is provided with a slit along the axial direction of the corrugated tube in order to enhance the workability of inserting the wire group, and the slit is opened to insert the wire group laterally (in the direction perpendicular to the axis).

As described above, a slit is provided in the corrugated tube so that the wire group can be inserted horizontally, but if the slit is positioned on the outer peripheral side of the bent portion in a region where the wire harness is bent and wired, the slit There is a problem that the wire opens into the slit and the wire bites into the slit, and the wire tends to protrude from the slit to the outside. In addition, foreign matter such as stones and nails may be mixed into the corrugated tube from the outside through the open slit, which may damage the electric wire inside the corrugated tube.

Therefore, it is common practice to wrap the adhesive tape around the outer circumference of the corrugated tube to prevent the opening of the slit. However, this method requires a tape winding operation and increases the number of operation steps, and there is a problem that the flexibility of the corrugated tube is impaired if it is intended to reliably prevent the opening of the slit by half-lap winding the tape. .

Further, as shown in FIG. 6A, a sealing component 110 having a cross-sectionally U-shape may be continuously fitted in the longitudinal direction of the slit 101 of the corrugated tube 100. However, attaching the sealing part 110 to the slit 101 impairs the flexibility and stretchability functions of the corrugated tube. And in the area | region where a wire harness bends, a slit opens and it becomes easy to remove sealing components, and when vibration of a motor vehicle is added especially, the sealing components 110 may remove completely from the corrugated tube 100. In order to prevent this, as shown in FIG. 6 (B), the sealing component 110 may be partially wrapped around the corrugated tube 100 with the adhesive tape 120. However, even if the adhesive tape 120 is wound around the sealing component 110 and the outer surface of the corrugated tube 100, the adhesive tape 120 may be deteriorated, cut or peeled off, and as a result, the sealing component 110 may be detached from the corrugated tube 100. is there.

In order to solve the above-mentioned problems, in JP-A-2000-287330, as shown in FIGS. 7 (A) and 7 (B), both ends of the slit 101 of the corrugated tube 100 sandwiching the slit 101 across the entire length thereof are opposite to each other. It has been proposed to provide lock claws 210 and 211 which are bent in a direction of "く" and to engage these lock claws 210 and 211.
In addition, as shown in FIGS. 8 (A) to (C), the applicant of the present invention engages the locking claw 220 and the locking hole 221 provided at the split end sandwiching the slit 101 in JP-A-2010-187447. It proposes what to stop.

JP 2000-287330 A JP, 2010-187447, A

The corrugated tube is manufactured by blow molding or vacuum molding. However, in the case of the shape of Patent Document 1, since the lock claw is bent in a “方向” shape in the radial direction, an undercut-shaped portion is generated. Therefore, the blow molding and vacuum molding can not be performed. Therefore, other molding methods must be adopted, such as injection molding using a mold that can form an undercut, and the manufacturing cost is significantly increased.
Furthermore, the engagement force is weak because the lock claws that are merely bent are engaged along the length direction of the corrugated tube, and the engagement is easily released if the corrugated tube is twisted in the longitudinal direction. Can not be reliably prevented from opening at the slit.
Similarly, if the shape of Patent Document 2 is used, the undercut shape is not obtained, and therefore, the manufacture becomes easier than Patent Document 1, but at a place where the corrugated tube bends sharply, when vibration during traveling is applied, locking occurs. There is a risk of deviation and there is room for improvement.

The present invention has been made in view of the above problems, and the corrugated tube itself has a known shape in which a single continuous slit is provided in the longitudinal direction, without winding the adhesive tape around the corrugated tube. It is an object of the present invention to provide a corrugated tube which can reliably prevent opening and does not impair flexibility.

In order to solve the above-mentioned subject, in the present invention, while surrounding a wire harness penetration course with a peripheral wall which provides annular peak parts and a valley part by turns in the length direction, one slit is carried out to the peripheral wall in the axial direction. Corrugated tube made of resin which is continuously provided,
It has flexibility in the space between the inner surface of the peripheral wall provided with the slit and the wire group of the wire harness to be inserted through the wire harness insertion path in the wire harness insertion path surrounded by the peripheral wall A gap-filling bag body having a closed cross-sectional shape in which the hollow portion is surrounded by a peripheral wall made of rubber, elastomer or soft resin material is accommodated continuously in the length direction, and the slit is closed by the bag body. Provides corrugated tubes for wire harnesses.

As described above, when the bag is inserted into the wire harness insertion passage surrounded by the circumferential wall of the corrugated tube at a position where the slit is closed from the inside, the electric wire constituting the wire harness in the wire harness insertion passage goes to the slit side When moving, the wire harness side peripheral wall of the bag body is pushed to the slit side peripheral wall to deform the bag body, and the slit side peripheral wall is pressed to the slit side, so the slit is reliably closed by the bag body and the electric wire from the slit It is possible to reliably prevent biting of the wire into the slit of the wire. And since a corrugated tube is a structure which only inserts a bag body manufactured continuously using a general purpose product in a corrugated tube, it can be provided inexpensively.

The thickness of the peripheral wall constituting the bag body is about 1 to 2 mm, and when it is pushed by the wire group of the wire harness in the wire harness insertion path, it can be easily shrunk and deformed. When the size of the corrugated tube is small, the thickness of the bag is reduced to about 1 mm, and when the size of the corrugated tube is large, it is preferable that the thickness of the bag is set to about 2 mm to provide strength.

The original shape before the bag body shrinks and deforms, the peripheral wall side provided with the slit is an arc-shaped peripheral wall and the wire harness side is a flat plate-shaped peripheral wall, and the entire shape is a substantially wedge-shaped cross section
It is preferable that the size of the bag is an original shape before contraction and deformation, and the occupation ratio in the wire harness insertion path is 40% at maximum, and the occupation ratio is 10% at minimum in the contraction deformation state.
If the occupancy rate of the bag is 40%, the occupancy rate of the wire harness is 60%, but if the occupancy rate becomes 80%, for example, if the occupancy rate becomes 80%, the bag is contracted and deformed. It can be used in a state where the occupancy rate is 20%. Therefore, it is possible to cope with the increase and decrease of the wire harness by using one type of bag body, and it is possible to reduce the number of parts of the corrugated tube having different sizes.

The bag body has flexibility such that the flat peripheral wall can be deformed to overlap the inner peripheral side of the arc-like peripheral wall from the original shape having a substantially wedge-shaped cross section, and can be bent in the longitudinal direction together with the corrugated tube It has flexibility. Therefore, when the wire harness covered with the corrugated tube is bent along the wiring path in the vehicle, the bag does not become an inhibiting factor.

It is preferable that a positioning rib to be inserted into the slit is provided in the bag so as to protrude, and a spherical head is provided at the tip of the positioning rib.
The positioning rib is provided so as to protrude from the center projecting end of the circular arc-shaped peripheral wall, and is inserted into the slit.
The protruding height of the positioning rib is at least greater than the height distance between the upper end point of the peak portion of the circumferential wall of the corrugated tube and the lower end point of the valley portion, and the positioning rib It is preferable to set it as the protrusion amount which does not retreat into the wire harness penetration path. Further, it is preferable to provide a spherical head at the tip of the positioning rib so that the shape can not be easily retracted from the slit.

The bag body has a thin plate-like peripheral wall on the wire harness side and a thick circular-arc shaped peripheral wall, and the flat plate-like peripheral wall is pressed by the wire harness and deformed from a flat plate shape to an arc shape overlapping the inner surface of the arc-like peripheral wall It is preferable to make it easy to do. A thin-walled portion may be provided at an intermediate position in the vertical direction of the thick circular arc-shaped peripheral wall so that the lower portion on the flat-shaped peripheral wall side can be easily bent inward.

The bag is preferably formed by continuous extrusion and cut into a required length for use.
Moreover, it is preferable to prepare three types of large, medium, and small bag bodies having different cross-sectional areas, and to use bag bodies prepared according to the size of the corrugated tube.

As described above, according to the corrugated tube for wire harness exterior of the present invention, a deformable bag is provided to be inserted inside, and since the slit is closed from the inside side by the bag, the slit may open. The bag can prevent the wire group passing through the inside of the corrugated tube from protruding outward from the slit, and the wire group can be protected. In addition, since the slit is closed by the bag body from the inside side, it is possible to prevent the foreign matter from entering the corrugated tube from the outside through the slit and damaging the electric wire. And, it is not necessary to wrap the adhesive tape to attach the bag body to the corrugated tube, and the work of assembling the wire harness into the corrugated tube can be simplified.

(A) and (B) are sectional drawings of 1st Embodiment. (A) is a perspective view of the main body of the corrugated tube of 1st Embodiment, (B) is a perspective view of the bag inserted in a corrugated tube. (A) and (B) are sectional drawings of 2nd Embodiment. It is a perspective view of the bag used in 2nd Embodiment. (A) (B) is sectional drawing of the bag of a modification. (A) (B) is drawing which shows a prior art example. (A) (B) is drawing which shows another prior art example. (A) to (C) are drawings showing still another conventional example.

Hereinafter, a corrugated tube of an embodiment of the present invention will be described with reference to the drawings.
1st Embodiment is shown to FIG. 1 and FIG.
As shown in FIG. 2 (A), the corrugated tube 1 of the first embodiment is hollow inside the corrugated tube main body 2 generally used and continuous in the longitudinal direction in the closed cross section shown in FIG. 2 (B). The bag 3 is inserted over the entire length of the corrugated tube body 2.

The corrugated tube 1 is formed of a corrugated tube which is sheathed in the wire group 10W of the wire harness 10 to be wired in a car. The corrugated tube main body 2 (hereinafter referred to as the main body 2) is a general-purpose product which is continuously extruded. The main body 2 is made of polypropylene or nylon, and is formed of a resin excellent in heat resistance and flame resistance. The annular peripheral wall 4 of the main body 2 is alternately provided with annular ridges 4a and valleys 4b in the length direction L, and one slit 5 is provided in the entire length in the length direction.

The hollow portion surrounded by the peripheral wall 4 of the main body 2 is a wire harness insertion passage 6, and the wire group 10W of the wire harness is inserted into the wire harness insertion passage 6, and the wire group 10W and the slit 5 are provided. The bag body 3 is accommodated between the inner peripheral wall 4 and the inner surface. That is, as shown in FIGS. 1A and 1B, the bag 3 is held between the inner surface of the peripheral wall 4 on the side where the slits 5 are provided and the wire group 10W of the wire harness.

The bag 3 has a closed cross-sectional shape in which the hollow portion 31 is surrounded by a peripheral wall 30 formed of a flexible resin material made of rubber, elastomer, vinyl chloride or the like having flexibility. In this embodiment, the peripheral wall 30 is formed of rubber and has a thickness of 1 mm to 2 mm so that it can be easily deformed when pushed by the wire group 10W of the wire harness.

The shape of the bag 3 is, as shown in FIG. 1A, the original shape before bending and contraction deformation, the flat-shaped peripheral wall 33 as the wire harness side is made continuous with both ends of the arc-shaped peripheral wall 32 as the slit side. , The entire shape is a cross-sectional substantially wedge shape. The arc-shaped peripheral wall 32 is in contact with the inner surface of the arc-shaped peripheral wall 4 on the slit 5 side of the main body 2 in a range of 90 degrees to 140 degrees. Further, the positioning rib 34 protrudes outward at the central vertex of the arc-shaped circumferential wall 32, and is inserted into the slit 5 from the inside and protrudes outward. A spherical head 34t is provided at the projecting end of the positioning rib 34, and the spherical head 34t is caught on both side edges of the slit 5 so that it is difficult to retract to the slit 5 side.

In the present embodiment, the size of the bag 3 is such that the cross-sectional area before shrinkage deformation occupies about 30% of the cross-sectional area of the wire harness insertion passage 6. That is, in FIG. 1 (A), the filling ratio of the wire group 10W of the wire harness 10 shown by being framed is filled with 70% filling, and the remaining 30% of the space is filled with the hollow portion 31 of the bag 3 The space on the slit 5 side in the wire harness insertion passage 6 is occupied by the bag 3, and the remaining space is occupied by the wire group 10 W of the wire harness 10.
In addition, when the wire group 10W of the wire harness moves to the slit 5 side in the wire harness insertion passage 6 due to vibration or the like, the flat peripheral wall 33 of the bag 3 is folded by the wire group 10W as shown in FIG. The hollow portion 31 is contracted so as to be pushed toward the slit side and to overlap the flat peripheral wall 33 with the inner surface of the circular arc peripheral wall 32. As shown in FIG. 1B, in the state where the bag 3 is contracted and deformed, the occupancy rate of the bag 3 is set to about 10% in the present embodiment.

The protruding height of the positioning rib 34 protruding from the bag body 3 is larger than the height distance between the upper end point of the peak portion 4 a of the peripheral wall 4 of the main body 2 and the lower end point of the valley portion 4 b The positioning rib 34 protrudes outward from the slit 5 in a state where the arcuate peripheral wall 32 is in contact with the inner surface of the peripheral wall 4 on the slit side. Also, the thickness of the positioning rib 34 is in pressure contact with the split ends on both sides of the slit 5, but the slit 5 is not spread.

The bag 3 is attached to the main body 2 of the corrugated tube by inserting the bag at the same time as the slit 5 is opened and the wire group 10W of the wire harness is inserted into the wire harness insertion passage 6 of the corrugated tube. At the time of bagging, the bag body 3 inserts the flat peripheral wall 33 first, and inserts the circular arc peripheral wall 32 so as to contact the inner surface of the peripheral wall 4 on the slit 5 side. Also, the positioning rib 34 is interposed in the slit 5.

In a state where the bag 3 is inserted into the wire harness insertion passage 6, the wire group 10W of the wire harness is pushed toward the peripheral wall 4 opposite to the slit 5. At the time of chewing, as shown in FIG. 1A, since the wire harness 10 is pushed by the flat peripheral wall 33 of the bag 3, the outer periphery of the wire harness 10 in contact with the bag 3 becomes flat, and the wire harness 10 faces downward. It becomes a bowl shape. As described above, in a state where the wire harness 10 and the bag body 3 are in contact with each other and accommodated in the wire harness insertion passage 6, almost no space is generated in the wire harness insertion passage 6.

As described above, since the positioning rib 34 of the bag 3 is inserted into the slit 5 and the arc-shaped peripheral wall 32 of the bag 3 is pressed against the inner surface of the peripheral wall 4 sandwiching the slit 5, the slit 5 is stabilized from the inside. Can be closed. In addition, the wire group 10W of the wire harness 10 passing through the inside of the wire harness insertion passage 6 is blocked by the bag body 3 and can not reach the slit 5. Therefore, the wire can be reliably prevented from protruding from the slit 5 and from being caught in the slit 5.

In addition, the wire harness 10 in the corrugated tube 1 is shifted to one side by vibration at the location where the wiring path of the wire harness is bent or when the vehicle is traveling, and as shown in FIG. In some cases, the bag 3 may be pushed to the slit 5 side. In this case, the wire harness 10 is in a state in which the gap C3 is opened on both sides separated by 90 degrees with respect to the slit 5, and the flat peripheral wall 33 of the bag 3 is pushed to overlap the inside of the circular arc peripheral wall 32 Transform into an arc. In this state, the bag body 3 is more strongly pressed against the inner surface of the peripheral wall 4 sandwiching the slit 5 to close the slit 5. Therefore, it can prevent that the electric wire of the wire harness 10 protrudes from the slit 5 or bites. And since the slit 5 is closed by the bag body 3, even when the slit 5 is open, foreign matter can be prevented from being mixed into the main body 2 of the corrugated tube through the slit 5 from the outside.

And since the circular arc peripheral wall 32 is in contact with the inner surface of the peripheral wall 4 sandwiching the slit 5, the slit 3 is inserted into the wire harness insertion path 6 of the main body 2 of the corrugated tube. Even if the bag 3 is opened, the bag 3 does not jump out through the slit 5. Further, the positioning rib 34 is pushed by the arc-shaped peripheral wall 32 and held in the inserted state into the slit 5 so that it does not come out of the slit 5. Therefore, it is not necessary to fix the bag body 3 to the main body 2 of the corrugated tube 1 by tape winding or the like, and to the main body of the corrugated tube of the bag body 3 as compared with the case of using the sealing part shown in FIG. The mounting workability of the Furthermore, since the bag 3 and the positioning rib 34 have flexibility, the bag 3 can be bent together with the main body 2 of the corrugated tube even when the wiring path of the wire harness is bent.

3 and 4 show a second embodiment.
The second embodiment is different from the first embodiment in that the positioning rib is not provided protruding from the arc-shaped peripheral wall 32 of the bag body 3-B. The other configuration is the same as that of the first embodiment, so the same reference numerals are given and the description is omitted.

Since the positioning rib is not provided in the bag 3-B, the slit 5 of the corrugated tube 1 is not closed by an inclusion such as a rib, but the arc-shaped peripheral wall 32 of the bag 3-B is formed at the inner opening of the slit 5. Is pushed. The bag 3-B is disposed on the inner surface side of the peripheral wall 4 provided with the slits 5, and the bag 3-B is interposed between the wire harness 10 and the slit 5 in order to dispose the wire harness 10 on the opposite side. The wire of the wire harness 10 can be prevented from protruding or biting from the slit 5. The bag is positioned on the slit 5 side since the occupancy rate of the wire harness 10 in the wire harness insertion passage 6 of the corrugated tube is 80% and the occupancy rate of the bag 3-B is 20% at the time of chewing. The wire of the wire harness can not reach the slit 5 beyond the body 3-B, and the protrusion of the wire from the slit 5 can be reliably prevented. In addition, since the slit 5 is closed by the bag body 3-B on the inner side, it is possible to prevent the entry of foreign matter into the corrugated tube from the outside.

As described above, in the present invention, since the slit provided in the corrugated tube is closed from the inside with a flexible bag inserted into the inside of the corrugated tube, biting of the electric wire into the slit, etc. The wire harness is bent and arranged, and even if the opening of the slit of the corrugated tube occurs, the slit can be closed from the inside with a bag body, and the wire jumps out of the opening slit. It can also prevent.
Furthermore, when vibration occurs in the electric wire group in the corrugated tube due to vibration during traveling of the automobile, the bag body in contact with the electric wire group has flexibility, so that the vibration of the electric wire group can be absorbed by the bag body. . As described above, by inserting the bag into the corrugated tube, the wire of the wire harness inserted into the corrugated tube is not strained.

As shown in FIG. 1 (B) and FIG. 3 (B), the bag bodies 3 and 3-B of the first and second embodiments are pushed by the wire group 10W of the wire harness 10 and the flat peripheral wall 33 is a circle. From the state deformed so as to overlap the arc-shaped peripheral wall 32, the original shape return to the cross-sectional wedge shape shown in FIG. 1 (A) and FIG. 3 (A) follows the movement of the wire group of the wire harness 10 in contact with the bag. It is done by elastic return.

The modification of a bag body is shown to FIG. 5 (A) (B).
The bag 3 of the modified example shown in FIG. 5A has the arc-shaped peripheral wall 32 and the flat-shaped peripheral wall 33 of the same thickness, and the boundary portions 36 and 37 have a large thickness. In this shape, when the flat peripheral wall 33 of the bag body 3 is pushed by the wire group of the adjacent wire harness, the flat peripheral wall 33 is the inside of the arc peripheral wall 32 with the thick boundary portions 36 and 37 as fulcrums. It can be deformed to overlap on the circumferential side. A spherical head is not provided at the tip of the positioning rib 34 provided on the bag body 3 of the modified example of FIG. 5 (A).

In the bag body 3 of the modified example shown in FIG. 5B, the arc-shaped peripheral wall 32 is made thick, and the flat-shaped peripheral wall 33 is made thin so as to be easily deformed. A thin portion 32v may be provided in the middle of the thick circular arc-shaped peripheral wall 32 in the longitudinal direction, and the lower portion of the circular arc-shaped peripheral wall 32 with the thin wall 32v as a fulcrum may be easily bent.

Further, if three kinds of large, medium and small bags of the first and second embodiments are prepared, they can be used as corrugated tubes having three different sizes.
And, by deformation of the inserted bag, adjacent two sized corrugated tubes can be absorbed into one sized corrugated tube to reduce the type of corrugated tube. For example, the inner diameter sizes D10 and D13 of the corrugated tube can be provided with only D13, and the surplus space of D10 can be occupied by the bag. Similarly, the inner diameter sizes D13 and D15 can be only D15.

DESCRIPTION OF SYMBOLS 1 Corrugated tube 2 main body 3, 3-B bag 30 surrounding wall 31 hollow part 32 circular arc-shaped surrounding wall 33 flat-shaped surrounding wall 34 positioning rib 4 surrounding wall 5 slit 6 wire harness penetration path 10 wire harness 10 W electric wire group

Claims (4)

1. A resin corrugated tube in which a wire harness insertion path is surrounded by a circumferential wall in which annular ridges and valleys are alternately provided in the length direction and a slit is continuously provided in the axial direction in the circumferential wall And
   It has flexibility in the space between the inner surface of the peripheral wall provided with the slit and the wire group of the wire harness to be inserted through the wire harness insertion path in the wire harness insertion path surrounded by the peripheral wall A gap-filling bag body having a closed cross-sectional shape in which the hollow portion is surrounded by a peripheral wall made of rubber, elastomer or soft resin material is accommodated continuously in the length direction, and the slit is closed by the bag body. Corrugated tube for wire harnesses.
2. The original shape before the bag body shrinks and deforms, the peripheral wall side provided with the slit is an arc-shaped peripheral wall and the wire harness side is a flat plate-shaped peripheral wall, and the entire shape is a substantially wedge-shaped cross section
   The size of the bag is an original shape before contraction and deformation, and the occupation ratio in the wire harness insertion path is 40% at maximum, and the occupation ratio is 10% at minimum in the contraction deformation state of the bag. Corrugated tube for wire harnesses.
3. The corrugated tube for the wire harness according to claim 1 or 2, wherein a positioning rib to be inserted into the slit is protruded on the bag body, and a spherical head is provided at the tip of the positioning rib.
4. The bag body has a thin plate-like peripheral wall on the wire harness side and a thick circular-arc shaped peripheral wall, and the flat plate-like peripheral wall is pressed by the wire harness and deformed from a flat plate shape to an arc shape overlapping the inner surface of the arc-like peripheral wall The corrugated tube for wire harnesses according to claim 2 or 3 which is made easy.

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