Electric wire for automobile

Abstract

The utility model relates to the field of wires, in particular to a wire for an automobile. The cable sequentially comprises a stranded conductor, an inner-layer insulator and an outer-layer insulator from inside to outside, the outer-layer insulator wraps the periphery of the inner-layer insulator, the periphery of the stranded conductor wraps the inner-layer insulator, and the inner-layer insulator sinks towards the gap direction of the stranded conductor. According to the utility model, the inner insulation layer is attached to the surface of the conductor in a tubular structure and cannot be squeezed into the gap of the conductor, so that the phenomenon of glue clamping is avoided. And meanwhile, the inner insulation layer sinks into the gap of the conductor, so that the adhesive force of the wire can meet the requirements of relevant standards. Besides, the junction of the inner insulation layer and the outer insulation layer is sawtooth-shaped or gear-shaped, so that the contact area between the inner insulation layer and the outer insulation layer can be increased, the two insulation layers are adhered to each other more tightly, and the phenomenon that the two insulation layers are separated during stripping is avoided.

Description

Technical Field

[0001] The utility model relates to the field of electric wires, in particular to an electric wire for automobiles. Background Art

[0002] As the new energy electric vehicle market continues to expand, automakers are increasingly demanding on the production efficiency and quality of automotive wiring harnesses. When the existing regular stranded conductors (conductor arrangement is: 1+6+12+18+…) are insulated, it is easy for insulation residue to appear in the gaps on the conductor surface (called lamination in the industry), which causes abnormalities when users cut, strip and ultrasonically weld. There are three main reasons:

[0003] ① Regular stranded conductors have hidden dangers in their structural design. Here, we take 7 conductors as an example, with 1 in the center and 6 in the outer circle closely arranged around the 1 in the center. Assuming that the diameters of the 7 strands are equal, there will always be a certain gap between 2 of them. During the extrusion process, under the pressure of the die head and the die, the molten insulating material 1' will be pressed into the gap of the stranded conductor 2', causing glue 3'. Figure 1 As shown;

[0004] ② The 7 single wires are produced by drawing by a wire drawing machine. Whether it is a single-head wire drawing machine or a multi-head wire drawing machine, it is impossible to ensure that the diameters of the 7 single wires are equal. It can only minimize the variation between them. Therefore, in the actual production process, the gaps between the conductors are even more serious, and the fewer the number of wires and the larger the diameter of the single wire, the more serious this phenomenon is (except for single conductors);

[0005] ③ During the process of laying out the conductor, it is turned by the guide wheel. During the turning, the conductor will be slightly flattened and deformed under the action of the running tension. Although it is regularized by the mold core (inner mold), the gap between the conductors is still enlarged.

[0006] For wires produced with regular stranded conductors, insulation residue often occurs, which makes wire cutting and stripping difficult. In order to avoid the impact of ultrasonic welding, the insulation skin remaining on the surface of each conductor still needs to be cleaned after stripping, which increases the user's labor cost and thus affects product sales. Summary of the invention

[0007] The technical problem to be solved by the utility model is to provide an electric wire for automobiles, which can avoid the phenomenon of glue clamping by adjusting the cable insulation layer.

[0008] The utility model is achieved in this way:

[0009] An electric wire for automobiles comprises, from inside to outside, a twisted conductor, an inner insulation layer and an outer insulation layer, wherein the outer insulation layer is wrapped around the outer periphery of the inner insulation layer, the outer periphery of the twisted conductor covers the inner insulation layer, and the inner insulation layer is sunken inwardly toward the gap direction of the twisted conductor.

[0010] Furthermore, the outer periphery of the inner layer insulation is sawtooth-shaped or gear-shaped.

[0011] Furthermore, the inner insulation layer is a tubular structure extruded by a tube extrusion die.

[0012] The advantages of the utility model are as follows: the inner insulation of the utility model is attached to the conductor surface in a tubular structure, and will not be squeezed into the gap of the conductor, thus avoiding the phenomenon of glue sandwiching. At the same time, the inner insulation sinks inward into the gap of the conductor, which can ensure that the adhesion of the wire meets the requirements of relevant standards. In addition, the junction of the inner and outer insulation layers is serrated or gear-shaped, which can increase the contact area between the inner and outer insulation layers, making the two insulation layers adhere to each other more closely, so as to avoid the separation of the two insulation layers when peeling. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

[0014] Figure 1 It is a structural schematic diagram of the prior art.

[0015] Figure 2 It is a structural schematic diagram of the utility model.

[0016] The reference numerals in the figure are: outer insulation 1 ′, stranded conductor 2 ′, interlayer 3 ′, inner insulation 1 , periphery of inner insulation 11 , outer insulation 2 , stranded conductor 100 . DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be understood that the description indicating the orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] The technical solution of the utility model is as follows:

[0020] See also Figure 2 As shown, an automotive wire for avoiding insulation residue of the utility model comprises a regular twisted conductor 100 (taking 7 as an example here), an inner insulation 1 and an outer insulation 2, wherein the outer periphery of the twisted conductor 100 is covered with the inner insulation 1, and the outer insulation 2 is wrapped around the outer periphery of the inner insulation 1.

[0021] The inner insulation 1 is extruded by a tube extrusion die, and the outer insulation is extruded by an extrusion die, so that the outer insulation shrinks more than the inner insulation, resulting in the inner insulation being squeezed and deformed, and slightly sinking into the joint of the conductor, so that the inner insulation and the conductor are more closely bonded.

[0022] Among them, the insulating material can be PVC, PE, PP, XLPVC, XLPE, etc., and the stranded conductor can be bare copper stranded wire, tinned copper stranded wire, silver-plated copper stranded wire, nickel-plated copper stranded wire, aluminum stranded wire, etc.

[0023] The outer periphery of the inner insulation 1, i.e., the connection 11 with the outer insulation, is serrated or gear-shaped, so that the inner and outer insulation layers are more tightly bonded. The round hole mold can be changed to a serrated or gear-shaped shape by changing the aperture of the mold. When cutting the wire, the wire cutter uses a cutter to cut off 2 / 3 to 3 / 4 of the thickness, and then pulls the insulation layer apart. If the adhesion is not tight enough, it will be delaminated during the pulling process.

[0024] The production method is as follows:

[0025] (1) The electric wire of the utility model is produced by a double-layer co-extrusion extruder. The inner insulation is extruded by a tube extrusion die. The extrusion pressure of this extrusion method is relatively small. The molten insulation material will not be pressed into the conductor gap, but will be attached to the conductor surface in a tube shape. The outer insulation is extruded by an extrusion die. The extrusion pressure of this extrusion method is relatively large, which can make the inner insulation sink inward into the connection gap with the conductor, ensuring that the adhesion of the wire meets the requirements of relevant standards.

[0026] (2) The junction of the inner and outer insulation layers is serrated or has other regular shapes, which can increase the contact area between the inner and outer insulation layers and make the two layers of insulation adhere more closely to each other, so as to avoid the separation of the two layers of insulation when the user is in use.

[0027] Although the specific implementation methods of the present invention are described above, those skilled in the art should understand that the specific embodiments described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An electric wire for automobile, characterized in that: From the inside to the outside, it includes a twisted conductor, an inner insulation layer and an outer insulation layer, the outer insulation layer is wrapped around the outer periphery of the inner insulation layer, the outer periphery of the twisted conductor covers the inner insulation layer, and the inner insulation layer is sunken inwardly toward the gap direction of the twisted conductor; the outer periphery of the inner insulation layer is sawtooth-shaped or gear-shaped; the inner insulation layer is a tubular structure extruded by a tube extrusion die.

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