JPH0511720U - Net tube for wire harness - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention aims to achieve both the protection characteristics and the expansion / contraction characteristics of the net tube for the wire harness. According to the present invention, a plastic wire is formed into a tubular net by an extrusion net manufacturing method, and the tubular net is a net tube for a wire harness in which an outer layer is made of a plastic material having a harder outer layer than an inner layer. At the same time, a plastic wire is formed into a cylindrical net by an extrusion type net making method or a braiding type net making method, and a protrusion for closing the mesh of the tubular net so as to project outward at a predetermined interval. The wire harness tube is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  This invention protects wire harnesses that send electricity to on-board equipment such as automobiles. For net tube for.

[0002]

[Prior art]

  Generally, a wire harness, which is a collection of electric wires that send electricity to onboard equipment, is In order to ensure the function of the Protected by.

[0003]   10 to 12 show an example of a conventional protective tube (actually disclosed in Japanese Utility Model Laid-Open No. 57-19). 0990, Japanese Utility Model Publication No. 63-49356). Figure 10 shows the same material A single piece of net tube formed by knitting a stick wire or fiber 51 into a cylindrical rhombus. Showing the body. Fig. 11: Stretchable by braiding similar plastic or metal wires The focusing wire (wire harness) 52 is passed through the braided tube 53 formed in the cylindrical net of FIG. 12 shows the state before passing through the tube 53, and FIG. 12 shows the state after passing through the tube 53. Conventional In this way, keep the wire harness with a net tube made of the same material. I am proposing something to protect.

[0004]   These plastic wire braided net tubes are used for fruits and vegetables such as mandarins and onions. It has a similar shape to the extruded product used for packaging, and therefore a similar extrusion It can be easily manufactured by a molding machine.

[0005]

[Problems to be solved by the device]

  However, in this conventional proposal, all net tubes are made of the same material. Manufactured from plastic or metal wire, the emphasis is placed on stretch characteristics for protection. However, if the emphasis is placed on the protection characteristics, the expansion and contraction characteristics will decrease. It was.

[0006]   In other words, since the net tube that focuses on elasticity has thin lines and elasticity, Although it is easy to pass the wire through the tube, the wire is so thin that it does not come in contact with external objects. It wears more and eventually breaks (breaks), causing fraying and thus lacking in protective properties. There is a drawback that. It is also possible to thicken the wire and improve the protection characteristics. Therefore, if this is done, the stretchability will decrease and the workability will deteriorate significantly. It causes a drawback.

[0007]   Therefore, this invention protects electric wires without impairing the expansion and contraction characteristics of the net tube. By providing a net tube for a wire harness that enables The purpose is to solve.

[0008]

[Means for Solving the Problems]

  In order to achieve the above object, the present invention provides a plastic wire or a rubber wire according to claim 1. Is formed into a tubular net by an extrusion net making method, and the tubular net is formed from the outer layer to the inner layer. Structure of net tube for wire harness made of hard plastic material and However, in claim 2, the plastic wire or the rubber wire is formed by the extrusion type netting method or the braided type netting method. It is formed into a cylindrical net, and the meshes are projected to the outside on the tubular net at predetermined intervals. Thus, the wire harness tube is formed so as to have a protrusion that closes it.

[0009]

[Action]

  According to the first aspect of the present invention, the hard plastic material of the outer layer exhibits wear resistance and protects the wear. And the softness of the inner plastic layer ensures stretchability. .

[0010]   Further, in claim 2, an external object of the net tube is formed by the protrusion of the same plastic material. Since the contact wear with will be prevented, the protection characteristics will be improved. Moreover, the elasticity Secured by a braided net tube.

[0011]

【Example】

  A first embodiment of the present invention will be described below with reference to FIGS.

[0012]   First, the configuration will be described with reference to FIGS. 1-3, 1 is a plastic The synthetic resin wire was made into a diamond-shaped (staggered) cylindrical net by the extrusion net-making method. A net tube, which is an inner layer of plastic wire (hereinafter referred to as the inner layer) 2 and an outer layer plastic wire (hereinafter referred to as an outer layer) 3. Inner layer 2 As the material, ethylene-vinyl acetate copolymer resin (EVA), ethylene-acrylic resin Ethyl acetate copolymer resin (EEA) or ethylene-methyl acrylate copolymer resin ( A soft resin (plastic) having rubber elasticity such as EMA) is used. Outer layer 3 material As a quality, wear resistance of polyethylene (PE) or polypropylene (PP) Use a hard resin. The inner layer 2 and the outer layer 3 are, as shown in FIGS. The lines that make up are connected to each other at the intersections that are nodes, that is, connection points 4, and other parts That is, they are separated from each other at the eyes 5.

[0013]   When a wire harness (not shown) is passed through the net tube 1, the inner layer 2 is elastic. Since it is a soft resin, it is easy to expand the circular cross section due to its good elasticity. The coating workability can be improved. Also, such a net tube 1 When the covered wire harness is wired to the vehicle, the outer layer 3 is made of hard resin. Therefore, due to its good wear resistance, even if it comes in contact with external objects such as vehicle accessories, Does not break or break. This makes the inner focused wire suitable for external objects. Therefore, the protection characteristics are remarkably improved.

[0014]   Next, an example of the product of the net tube 1 of the above embodiment will be described with reference to FIGS. . This is a die-out adhesive type. In FIG. 4, the rotary shaft 6 is an upper sprocket. It is rotated by a ket 7, and an inner die 8 is fixed to the lower part thereof. In this An outer die 9 is provided in contact with the circumference of the side die 8, and the outer die 9 is a lower sprocket. The hood 10 rotates in the direction opposite to the inner die 8.

[0015]   The mandrel 11 for welding is fixed to the lower part of the inner die 8 and is used for the liquid in the bath 17. It is installed so that it is submerged inside. 12 is a soft resin inner layer pressure inlet such as EVA And 13 is a pressure inlet of a resin for a hard outer layer such as PE.

[0016]   As shown in FIGS. 5, 6 and 7, in order to extrude both resins linearly, the inner die 8 has Several inner peripheral nozzles 15 are annularly provided, and the outer die 9 has the same outer peripheral nozzle 16. It is provided in an annular shape on the outside by the number of pieces.

[0017]   The resin for the inner layer is fed from the inner peripheral nozzle 15 to the filler through the pressure inlet 12 by an extruder (not shown). Is extruded in a spiralar shape as a ment. Similarly, the resin for the outer layer is passed through the pressure inlet 13. Is pressed from the outer peripheral nozzle 16 as a filament in a spiral shape in the direction opposite to the inner layer. Will be issued. These spiral filaments, that is, the linear resins of the inner and outer layers, are When they pass through the drel 11, they overlap and are welded at the joint (node) 4 (see FIG. 2). The other part of the net is separated by a mesh 5 and is a diamond-shaped net tube consisting of an inner layer and an outer layer. Form 1 The formed net tube 1 is exposed to the outside via the winding roll 14. The product is rolled up and cut into a predetermined length to obtain a product.

[0018]   8 to 9 show the second embodiment. This embodiment is an inner layer as shown in FIG. Weaving the plastic wire 21 and the plastic wire 22 as the outer layer into a cylindrical zigzag net. In addition, the protrusions 23 are provided so as to close every other eye. This All of them are made of the same material and synthetic resin having rubber elasticity. The protrusion 23 is As shown in the figure, the mesh is closed and the mesh surface is generally on the outer surface (the outer layer plastic wire 22). It is also formed so that it protrudes slightly outward.

[0019]   This net tube, when used as a wire harness coating, From the general surface, the protrusion 23 is traveling outward, and the material of the protrusion 23 is like rubber. As it is a synthetic resin with elasticity, it protects the net by resisting friction such as rubbing. Prevents wire breakage and fraying of the braided wire and improves the protection function.

[0020]   In addition, the mesh of the net is blocked at a predetermined interval and other meshes are not blocked, so the elasticity of the net is It is held, and the workability of mounting the wire harness can be improved.

[0021]   FIG. 9 shows an example of the manufacturing method. The inner die 24 and the outer die 25 are opposite to each other Rotation from the resin reservoir 30 to the inner peripheral nozzle 26 and the outer peripheral nozzle 27, respectively. Therefore, the inner layer plastic wire 21 and the outer layer plastic wire 22 are alternately extruded to form a mesh body. To form. With a certain relation to this extrusion process, the ring die 31 The same resin is extruded in a film form from the slit-shaped projection forming nozzle 28 to form a mesh body. At the same time, the protrusions 23 are formed by closing every other eye. And The mandrel 29 welds the wire 21 and the wire 22 at the node, and at the same time, they are outside The protrusion 23 is welded to such an extent that it slightly protrudes.

[0022]   The above embodiments have been described with respect to the rhombic net tube. It is not limited to this, but it is suitable for rectangular net (trical net) tubes. However, the same can be applied. In this device, the plastic wire is Even if a rubber wire is used as a substitute, the same applies.

[0023]   Further, the invention of the second embodiment is based on the above-mentioned extrusion type net-making method. It is not limited to a tube, but is also applicable to other braided net tubes. In that case, the plastic wire is called plastic fiber. It can be replaced.

[0024]

[Effect of device]

  As described above, according to the present invention, the net tube for the wire harness is provided. There is an effect that both expansion and contraction characteristics and protection characteristics can be achieved.

[Submission date] November 15, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

First, the configuration will be described with reference to FIGS. In FIGS. 1 to 3, reference numeral 1 denotes a net tube made by extruding a plastic (synthetic resin) wire into a diamond-shaped (staggered) cylindrical net, which is an inner layer of plastic wire (hereinafter referred to as inner layer). consists a called) 2 and the outer layer to become plastic line (hereinafter referred to as the outer layer) 3. The material of the inner layer 2 is a soft resin having rubber elasticity (ethylene-vinyl acetate copolymer resin (EVA), ethylene-ethyl acrylate copolymer resin (EEA) or ethylene-methyl acrylate copolymer resin (EMA)). Plastic) is used. As the material of the outer layer 3, a hard resin having abrasion resistance such as polyethylene (PE) or polypropylene (PP) is used. As shown in FIGS. 2 and 3, the inner layer 2 and the outer layer 3 have their respective lines connected to each other at intersections or connection points 4 serving as nodes, and are separated from each other at other portions or eyes 5.

[Brief description of drawings]

FIG. 1 is a perspective view of a net tube showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a side view of FIG.

FIG. 4 is a cross-sectional view of a schematic device showing a method for producing the net tube of the first embodiment.

5 is a bottom view showing a portion of the inner and outer dies of FIG.

FIG. 6 is an enlarged view of a main part of FIG.

FIG. 7 is an enlarged cross-sectional view of a main part of FIG.

FIG. 8 is a perspective view of a net tube showing a second embodiment of the present invention.

FIG. 9 is a cross-sectional view of a schematic device showing a manufacturing method of a net tube of a second embodiment.

FIG. 10 is a perspective view of a conventional net tube.

FIG. 11 is a perspective view showing a state before mounting a conventional net tube and a focusing electric wire.

12 is a perspective view showing the state of FIG. 11 after mounting.

[Explanation of symbols]

1 Net tube 2 inner layer 3 outer layers 4 joints (sections) 5th 6 rotation axes 7 Upper sprocket 8 inner die 9 Outside die 10 Lower sprocket 11 Welding mandrel 12 Inner layer resin pressure inlet 13 Outer layer resin pressure inlet 21 Inner layer plastic wire 22 Outer layer plastic wire 23 Projection 24 Inside die 25 outer die 26 Inner peripheral nozzle 27 Peripheral nozzle 28 Projection forming nozzle 29 Mandrel 30 resin reservoir 31 ring die

Claims (2)

[Scope of utility model registration request] 1. A net tube for a wire harness, wherein a plastic wire or a rubber wire is formed into a cylindrical net by an extrusion net-making method, and the cylindrical net is formed of a plastic material having an outer layer harder than an inner layer. 2. A plastic wire or a rubber wire is formed into a cylindrical net by an extrusion net manufacturing method or a braided net manufacturing method, and
A wire harness tube in which protrusions are formed on the tubular mesh so as to project the mesh of the mesh at predetermined intervals so as to project outward.