JP2011234509A - Net-like protective material for wiring harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a net-like protective material having a protective function and a noise reduction function for a wiring harness.SOLUTION: A net-like protective material is in a sheet shape or a tube shape and is in a net-like shape with intersections of vertical lines and horizontal lines made of resin wire being thermally fused by pressure. On an outer surface opposite to the fused spots of the vertical lines and/or the horizontal lines, cushioning projections are sequentially provided in the length direction.

Description

  The present invention relates to a net-like protective material for a wire harness routed in a vehicle, and the net-like protective material is sheathed on an outer peripheral surface of a wire group of the wire harness to protect the wire harness and prevent noise. It consists of

Conventionally, to bind and protect the wires in the wire harness that is routed to the vehicle, to prevent interference with external interference materials, and to buffer the wires, wrap adhesive tape around the wires, or wrap around a tube such as a corrugated tube or round tube. Through the wire group.
Conventionally, a vinyl chloride tape has been widely used as an exterior material composed of these tapes and tubes, and polypropylene or the like has been used as a corrugated tube, both of which are made of resin.
Furthermore, a net tube made of a resin yarn proposed in Japanese Utility Model Laid-Open No. 4-21119 is also used.

  Net tubes use less resin, so they can be lighter and contribute to improved fuel efficiency. Further, the net tube has an advantage that the cost can be reduced, and the wire harness can be easily threaded through the wiring route of the wire harness while being excellent in stretchability and flexibility.

On the other hand, the protection function of the net tube is reduced because the wire group is exposed in the hole of the net as compared with the case where the wire harness is inserted into the closed cross-sectional space in the corrugated tube or the cylindrical tube. In addition, since the thickness is relatively thin and relatively hard, the cushioning property is inferior upon contact with the interference member, noise is likely to occur, and there is room for improvement in wear resistance.
Further, the conventional net tube is formed in a net shape by knitting warp and weft to reverse adjacent intersections and warp and weft. Therefore, the bonding force between the warp and the weft at the intersection is weak. Therefore, there is a problem that when the tensile force or tearing force is applied to the intersection point, it is easy to be released from the cutting opening, and peeling at the intersection point, so-called breakage occurs, and the shape retention force is low.

ACT No.4-211119

  The present invention has been made in view of the above problems, and is relatively thick and imparts cushioning properties to enhance the protective function and enhance the noise prevention effect. Further, fraying does not occur from the cutting opening and does not peel off at the intersection. An object of the present invention is to provide a net-like protective material composed of a wire harness sheet or a tube having increased bonding strength.

In order to solve the above problems, the present invention provides:
It is a sheet shape or a tube shape, and the intersection of the vertical line and horizontal line made of resin wire is pressed and heat-sealed to form a net shape,
A net-like protective material for a wire harness, characterized in that a protrusion for cushioning is continuously provided in a length direction on an outer surface facing one or both of the vertical line and horizontal line and the fusion position. providing.

It is preferable that the protrusion dimension of the cushion protrusion protruding from the vertical line or horizontal line is 20 to 60% of the thickness of the vertical line or horizontal line.
The shape of the protrusion for cushion may be an arbitrary shape such as a rectangular shape, a mountain shape, an arc shape, or an arrowhead shape in a cross section in a direction perpendicular to the length direction.

As described above, when the cushion projection is provided on the outer surface side of the vertical line and / or the horizontal line as the net, the net-like protective material can be easily thickened and the thickness thereof can be easily adjusted.
In this way, if the net-shaped protective material is thickened by providing cushioning projections, the protection function of the wire harness can be enhanced, and even if the wire harness routed along the vehicle body repeatedly contacts the vehicle body due to vibration, the cushion Occurrence of abnormal noise can be prevented or reduced by contact of the projections. Furthermore, the wear resistance of the net-like protective material itself can be enhanced.

  The vertical line and the horizontal line are not knitted so that adjacent intersections are upside down, but formed into a net shape with a sizing machine described later, for example, the vertical line is the upper side, the horizontal line is the lower side, The intersections of the vertical and horizontal lines are brought into surface contact, and as described above, they are fused so as to be embedded in the mating wire.

In addition, the vertical line and the horizontal line are elliptical in cross section, and at the fusion part of the intersection of the vertical and horizontal lines, 40% to 50% of the cross-sectional area is melted in the other fiber. It is preferable that they are fused to each other in the embedded state and frayed at the cut end.
In this way, the outer peripheral surface is not welded by line contact at the intersection of the vertical and horizontal lines, but the vertical line and the horizontal line have an elliptical cross section, and one or both of the wires are embedded in the mating wire. Thus, they are firmly fixed to each other. Therefore, even if a tensile force or tearing force is applied to the net-shaped protective material, the connection between the vertical and horizontal lines will not be peeled off at the intersections, no breakage will occur, the shape retention force is strong, and the reliability as a net-shaped protective material is high. It will be expensive.

The vertical and horizontal lines are one or more non-halogen resin components selected from polypropylene, polyester, polyethylene, polyethylene terephthalate, polyamide, polyphenylene ether, polybutylene terephthalate, polyphenylene sulfide, and a mixture of two or more of these, bromine-based, It preferably comprises a flame retardant resin wire blended with a flame retardant selected from a phosphate ester, a metal hydroxide, and melamine.
As the resin component, polypropylene is most preferably used from the viewpoint of processability and cost.
Thus, since it forms with a flame-retardant resin wire, it can coat | cover to the wire harness routed in the engine room of a vehicle.

  Specifically, the flame retardant resin wire contains 0.5 to 100 parts by mass of the flame retardant with respect to 100 parts by mass of the resin component. Furthermore, 0-50 mass parts may be mix | blended with the filler which consists of magnesium oxide and / or calcium carbonate as needed with respect to 100 mass parts of said resin components.

The net-like protective material of the present invention consisting of the vertical and horizontal lines is a sheet or a tube, and the sheet is bent in a cylindrical shape that is wrapped at both ends in the width direction.
When it is set as a tube, the edge of the width direction of one sheet | seat is mutually heat-sealed, and it is set as the tube.

The shape of each hole surrounded by the vertical and horizontal lines is a square, a rectangle, a rhombus, a hexagon, or a circle of any one of a perfect circle, an ellipse, and an ellipse.
The shape of the holes is adjusted according to the required stretchability and strength.
That is, the size of the pores can be increased by roughening the net when the demand for stretchability is high, and increasing the size of the pores, and when the demand for strength and wear resistance is high, the net is fined. The holes are made smaller. The shape of the pores is a rhombus shape to make it easy to stretch, and a square or rectangle to make it difficult to stretch.

The net-like protective material of the present invention, the vertical line and the horizontal line are formed as a net-like sheet with a sizing machine, heated and pressurized at the time of forming, the intersection of the vertical and horizontal lines is heat-sealed in a pressurized state,
The net-like sheet is cut into a required length, and both ends of the cut net-like sheet in the width direction are wrapped so as to have a cylindrical shape.
When forming a net-like sheet with a die set composed of an out die and an in die of the sizing machine, a protruding hole for forming a protrusion for cushioning is continuously provided on the outer surface side of the hole of the out die or / and in die. Thus, a net-like protective material provided with a protrusion for cushioning can be easily manufactured.

As described above, the net-like protective material that is an exterior material for a wire harness according to the present invention has cushion protrusions on the outer surface of the vertical line and / or horizontal line, so that the protection function of the wire harness can be enhanced. At the same time, the generation of abnormal noise can be prevented and reduced when the wire harness comes into contact with the vehicle body or the like.
Furthermore, by using the net shape, the weight can be reduced to ½ or less as compared with a conventional resin round tube.

The net-like sheet | seat of this invention is shown, (A) is a perspective view, (B) is a partial expansion perspective view. (A) is an enlarged perspective view of a vertical line, (B) is an enlarged sectional view of the sheet, and (C) is a plan view of the sheet. (A) (B) (C) is drawing which shows the method of using a sheet | seat as an exterior material of a wire harness. (A) is a schematic view showing a manufacturing apparatus, (B) is a perspective view of a die set, (C) is an explanatory view of a process of forming a net with vertical and horizontal lines in the die set, and (D) shows a hole of an out die. It is an enlarged view. It is drawing which each shows the process of shaping a net-like sheet | seat in circular arc shape. The net-like sheet | seat of 2nd embodiment is shown, (A) is a top view, (B) is a bottom view, (C) is CC sectional view taken on the line of (A), (D) is D- of (A). It is D line sectional drawing. (A) (B) is drawing which shows the modification of the processus | protrusion for cushions. (A) (B) (C) is drawing which shows embodiment of the net-shaped tube of 3rd embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a first embodiment.
The net-like protective material of the first embodiment shown in FIG. The sheet 1 has a net shape in which a vertical line 2 and a horizontal line 3 having an elliptical cross section are fused at an intersection point 4 and a hole 5 surrounded by the vertical and horizontal lines 2 and 3 is provided.

As shown in FIGS. 2A and 2B, the vertical and horizontal lines 2 and 3 are arranged such that the vertical line 2 is located on the upper side and the horizontal line 3 is located on the lower side, and the vertical and horizontal lines 2 and 3 are fused at the intersection 4.
At the intersection 4, the vertical line 2 and the horizontal line 3 having an elliptical cross section are in surface contact with each other, and a portion 3 m of 40 to 50% of the cross-sectional area of the lower horizontal line 3 enters the upper vertical line 2. It is fused in a state where

  Further, as shown in an enlarged view in FIG. 2B, a cushion protrusion 2a is provided on the outer surface of the vertical line 2 on the upper surface side (that is, the surface opposite to the fusion side with the horizontal line 3). The cushion protrusion 2a is continuous in the length direction. The protrusion dimension L1 of the cushion protrusion 2a is 20 to 60% of the minor axis dimension L2 of the vertical line 2. In this embodiment, the protrusion dimension of the cushion protrusion 2a is 0.1 mm to 0.2 mm, and the thickness of the net-like sheet 1 formed by the vertical and horizontal lines 2 and 3 is 0.5 to 1.0 mm.

The vertical line 2 and the horizontal line 3 are made of the same single flame-retardant resin wire 10 and have an elliptical cross section as described above.
Specifically, the flame retardant resin wire 10 is a kind of non-halogen resin component selected from polypropylene, polyester, polyethylene, polyethylene terephthalate, polyamide, polyphenylene ether, polybutylene terephthalate, polyphenylene sulfide, and a mixture of two or more thereof. Above, a flame retardant selected from bromine, phosphate ester, metal hydroxide and melamine is blended.
The said flame retardant is mix | blended 0.5-100 mass parts with respect to 100 mass parts of said resin components. Furthermore, 0 to 50 parts by mass of a filler made of magnesium oxide and / or calcium carbonate is blended with 100 parts by mass of the resin component as necessary.
In this embodiment, polypropylene (PP) is used as the resin component, and a brominated flame retardant composed of “tetraprobisbisphenol” is used as the flame retardant.

As shown in FIG. 3, the net-like sheet 1 is formed into a cylindrical shape by bending creases so that both end sides in the width direction perpendicular to the axial direction of the length wrap each other as shown in FIG. Is pre-shaped. In that case, it shape | molds so that the vertical line 2 which provided the protrusion 2a for cushions may become an outer peripheral surface.
In the step of attaching the sheet 1 to the wire harness 20, the sheet 1, which is vertically aligned along the length direction of the electric wire group W of the wire harness 20 with the cushion protrusion 2 a as the outer peripheral surface side, The wire group W is wound around the outer peripheral surface. In this state, both end sides in the width direction can be wrapped to completely cover the entire outer peripheral surface of the wire group W. Then, the adhesive tape T is wound around and fixed to the electric wire group W drawn from both ends in the length direction of the sheet 1.

  In this way, by projecting the cushion projection 2a to the outer surface, the seat 1 is wrapped around the wire harness and sheathed, and when the wire harness is routed along the vehicle body, the wire harness has the cushion projection 2a on the seat 1. To contact the vehicle body. Therefore, the protection function of the wire harness can be enhanced by the cushion projection 2a, and even if the wire harness repeatedly contacts the vehicle body due to the running vibration of the vehicle, the generation of noise is prevented and reduced by the cushion projection 2a. be able to.

Next, a method for manufacturing the net-like sheet 1 will be described.
The sheet 1 is formed by a sizing machine 30 shown in FIG. In detail, a flame retardant, a stabilizer, etc. are put into the hopper 25 in the resin component, and the mixture is stirred and mixed by the hopper 25, and the mixture thus stirred and mixed is kneaded by the screw conveyor 26 to the die set 27 shown in FIG. The kneaded material is conveyed and molded as a net-like sheet 1 made of the flame-retardant resin wire 10 with a die set 27.

  The die set 27 includes an out die 27a and an in die 27b. The out die 27a and the in die 27b are rotated in the opposite directions by the motor 29, and an intersection (intersection) where the vertical line 2 and the horizontal line 3 overlap is formed in a portion 27c where the hole of the out die 27a and the hole of the in die 27b are bulky. A lattice shape is formed by separating the hole 27ah of the out die 27a from the hole 27bh of the in die 27b.

  The resin forming the vertical line 2 is discharged from the hole 27ah of the out die 27a, and as shown in an enlarged view in FIG. 4D, a protrusion that forms a cushion protrusion 2a at the center on the outer peripheral side of the hole 27ah. The hole 27ah-1 is continuously projected. The cushion protrusion 2a is continuously formed on the outer surface of the vertical line 2 with the resin discharged from the protrusion hole 27ah-1.

Further, when extrusion from the die set 27 is performed, the vertical lines 2 and the horizontal lines 3 are heated and pressurized, and the vertical and horizontal lines 2 and 3 are welded. And, at the intersection 4 of the vertical and horizontal lines 2 and 3, since it is heated under pressure, as shown in FIG.
Next, the net-like sheet 1 is conveyed to the cooling tank 31, is heat-stretched by the stretching roller 32, is stretched and then transported to the stretching tank 33, and then the sheet 1 is wound around the coil 41.

The net-like sheet 1 is bent in the process shown in FIG. 5 so that both ends in the width direction wrap to each other to form a cylindrical sheet 1-B.
That is, a forming machine 45 having a conical cylindrical shape is used, and pulling rolls 46A and 46B are arranged upstream and downstream of the forming machine 45. The sheet 1 is passed from the roll 46A through the molding machine 45 and is curled in an arc shape inside the molding machine 45 so that the end portion in the width direction wraps at the final small diameter portion. In this state, the continuous sheet 1-B is manufactured by being pulled out by the roll 46B. The sheet 1-B is cut to a required length by a cutting machine 47 in accordance with use conditions.

As shown in FIG. 2B, the net-like sheet 1 having the above-described configuration is deformed into an elliptical cross section at the intersection 4 of the vertical and horizontal lines 2 and 3, and enters into the opposing line. As a result, it is less likely to peel compared to the case where only the outer peripheral surfaces of the vertical and horizontal lines are welded, and has the above-described tensile strength and tear strength, and no breakage occurs. , Become reliable.
Moreover, since both the vertical and horizontal lines 2 and 3 are formed from the flame-retardant resin wire 10, the net-like sheet 1 has flame retardancy and can be used as an exterior material for a wire harness routed in an engine room. In addition, since the vertical and horizontal lines 2 and 3 are firmly fixed to each other, fraying does not occur at the cut ends of the vertical and horizontal lines 2 and 3. And since the sheet | seat 1 is made into net shape, a weight can be halved compared with a round tube. In particular, when it is used as an exterior material for a large number of wire harnesses routed in an automobile, it can contribute to reducing the weight of the automobile and improve fuel efficiency.
Furthermore, as described above, since the cushion protrusion is provided on the outer surface side, the protection function of the wire harness can be enhanced, and the generation and generation of abnormal noise can be prevented.

FIG. 6 shows a second embodiment.
In the seat 1 of the second embodiment, the cushion-shaped projections 3a are also provided on the outer surface of the horizontal line 3, and the cushion-shaped projections 2a and 3a are projected on the outer surfaces of the vertical and horizontal lines 2 and 3, respectively. Can be made thicker and cushioning can be increased.

  The protrusions 2a and 3a for cushioning provided on the vertical line 2 and / or the horizontal line 3 change the shape of the communication hole h-1 provided in the hole of the die so as to form an arrowhead as shown in FIG. 7A, FIG. It is good also as the mountain shape shown to.

FIG. 8 shows a third embodiment.
In the third embodiment, the net-like protective material is a net-like tube 50.
In the first embodiment, after the sheet 1 is shaped into an arc shape and shaped so that both ends in the width direction wrap, as shown in FIG. 8 (A), both wrapped edges are heat-sealed. Tube 50.
As shown in FIG. 8 (B), the net-like tube 50 is contracted and inserted through the wire harness 20, and after being inserted, is stretched as shown in FIG. 8 (C). It is fixed at T.

1 Net-like sheet 2 Vertical line 2a Cushion protrusion 3 Horizontal line 4 Intersection 5 Hole 50 Net-like tube

Claims (3)

It is a sheet shape or a tube shape, and the intersection of the vertical line and horizontal line made of resin wire is pressed and heat-sealed to form a net shape,
A net-like protective material for a wire harness, characterized in that cushion protrusions are continuously provided in a length direction on an outer surface facing either one or both of the vertical lines and horizontal lines.   The net-like protective material for a wire harness according to claim 1, wherein a protruding dimension of the cushion protrusion protruding from the vertical line or horizontal line is 20 to 60% of a thickness of the vertical line or horizontal line.   The vertical line and the horizontal line have an elliptical cross section, and at the fusion part at the intersection of the vertical and horizontal lines, either one or both of them are embedded in the partner fiber by melting 40% to 50% of the cross sectional area. The net-like protective material for a wire harness according to claim 1, wherein the net-like protective material is fused to each other in a state where the wire harness is welded and frayed at a cut end.

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