JP2002245859A - High tension automobile cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high tension automobile cable hard to generate broken conductors. SOLUTION: For the high tension automobile cable 1, comprising an insulation body 3 laid on a conductor 2, a braid 4 formed on the insulation body 3, and a sheath 5 laid on the braid 4, the conductor 2 is composed of a core material 6 made of conductive rubber, and a metal resistor wire 7 wound around the core material 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage cable for an automobile, which supplies a high voltage generated by an ignition coil to a spark plug, and in particular, a high-voltage cable for an automobile in which a conductor is not broken when manufacturing an electric wire. About.

[0002]

2. Description of the Related Art Hitherto, as a high voltage cable for an automobile which connects an ignition coil and a spark plug to supply a high voltage generated by an ignition coil of the automobile to a spark plug, for example, Japanese Patent Application Laid-Open No. 9-92039 discloses As described above, a metal resistance wire is wound on a core obtained by extruding and coating a ferrite core obtained by kneading a resin or rubber base with ferrite powder on a central reinforcing core formed by twisting aramid fibers into a linear shape, It is known that an insulator is coated thereon, and a braid and a sheath are coated on the insulator.

[0003]

In such a conventional high-voltage cable for automobiles, if the resistance of the metal resistance wire is low, the generation of radio noise cannot be sufficiently prevented. The value must be kept above a certain level.
Therefore, the diameter of the metal resistance wire is as thin as about 0.05 mm. For this reason, in the case of high-voltage cables for automobiles, the core is required when manufacturing the cable, peeling off the terminal, crimping the terminal to the terminal, or applying an impact load to the cable. In some cases, the metal resistance wire wound on the material is easily broken, and the high voltage generated by the ignition coil cannot be sufficiently applied to the ignition plug.

[0004] It is an object of the present invention to provide a high-voltage cable for automobiles in which the conductor is not broken.

[0005]

According to a first aspect of the present invention, there is provided a high-voltage cable for a motor vehicle, wherein an insulator is coated on a conductor, and a braid is formed on the insulator. ,
An automotive high-voltage cable comprising a sheath covered on the braid, wherein the conductor is composed of a core material formed of conductive rubber and a metal resistance wire wound on the core material. Is what you do. According to the first aspect of the present invention having such a configuration, the conductor is constituted by a core material formed of conductive rubber and a metal resistance wire wound on the core material. In comparison, the resistance value of the metal resistance wire can be reduced. Therefore, the diameter of the metal resistance wire can be made larger than before, and the metal resistance wire can be prevented from being easily broken. In addition, since the core material itself has conductivity even if the metal resistance wire is broken, it is possible to prevent the wire from being broken as a conductor, and to reliably supply a high voltage generated in the ignition coil to the ignition plug. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a high-voltage cable for a vehicle according to the present invention will be described below. FIG. 1 shows an embodiment of a high-voltage cable for an automobile according to the present invention. The high-voltage cable 1 for a vehicle according to the present embodiment shown in FIG. 1 is used for connection between an ignition coil and a spark plug in order to supply a high voltage generated in an ignition coil of the vehicle to a spark plug. Is what is done.

The high-voltage cable 1 for an automobile comprises a conductor 2
Is covered with an insulator 3, and a braid 4 is placed on the insulator 3.
And the sheath 5. The conductor 2 includes a core 6 formed of conductive rubber and a metal resistance wire 7 wound on the core 6.

The conductive rubber forming the core 6 is formed by mixing a conductive filler such as carbon black with silicone rubber. However, the conductive rubber forming the core material 6 is not limited to such a material, and may be any rubber having conductivity. The resistance of the core material 6 is a resistance value that does not generate radio noise (for example, 7 kΩ /
m or more). The reason for such a resistance value is that
If the metal resistance wire 7 breaks, the resistance of the metal resistance wire 7 is lost, and the resistance of the conductor 2 of the high-voltage cable 1 for an automobile becomes only the resistance of the core material 6. Therefore, even if the high voltage generated in step (1) is supplied to the plug, the generation of radio noise can be prevented as much as possible only by the resistance of the core material 6.

Metal resistance wire 7 wound on core material 6
Is a nichrome wire, a stainless steel wire, or the like. Further, since the resistance of the conductor 2 of the high-voltage cable 1 for an automobile is a combined resistance of the resistance of the metal resistance wire 7 and the resistance of the core material 6, the resistance of the metal resistance wire 7 may be lower than before. Accordingly, the diameter of the metal resistance wire 7 is larger than the diameter of the metal resistance wire 0.05 mm in the conventional high voltage cable for automobiles.

The resistance of the conductor 2 is the sum of the resistance of the core material 6 and the resistance of the metal resistance wire 7 and is set to a resistance value that does not completely generate radio noise, for example, 16 kΩ / m. Therefore, for example, the resistance of the core material 6 is set to 8 kΩ /
m, the resistance of the metal resistance wire 7 is 8 kΩ / m.

According to the present invention, the conductor 2 of the high-voltage cable 1 for an automobile is composed of the core material 6 made of conductive rubber and the metal resistance wire 7 wound on the core material 6 as described above. Therefore, the resistance of the metal resistance wire 7 can be reduced as compared with the related art. Therefore, the diameter of the metal resistance wire 7 can be made larger than that of the related art, and the metal resistance wire 7 can be prevented from being easily broken. Further, even if the metal resistance wire 7 is broken in the high-voltage cable 1 for an automobile, since the core 6 has conductivity, the high voltage generated by the ignition coil is supplied to the plug via the core 6. The resistance of the core 6 at that time is set to a resistance value that can suppress the generation of radio noise by itself, so that the generation of radio noise when a high voltage is supplied to the plug is minimized. Can be prevented. Further, if the resistance of the conductor 2 of the high-voltage cable 1 for an automobile according to the present embodiment is set to, for example, 16 kΩ, generation of radio noise can be completely prevented.

[0012]

According to the present invention, since the conductor is composed of a core material formed of conductive rubber and a metal resistance wire wound on the core material, the resistance value of the metal resistance wire is smaller than that of the prior art. Can be lowered. Therefore, the diameter of the metal resistance wire can be made larger than before, and the metal resistance wire can be prevented from being easily broken. In addition, since the core material itself has conductivity even if the metal resistance wire is broken, it is possible to prevent the wire from being broken as a conductor, and to reliably supply a high voltage generated in the ignition coil to the ignition plug. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a high-voltage cable for an automobile according to the present invention.

[Explanation of symbols]

 1 High-voltage cable for automobiles 2 Conductor 3 Insulator 4 Braid 5 ……………… Sheath 6 ………………… Core 7 …………………………….

Claims (1)

[Claims] 1. An automotive high-voltage cable comprising a conductor covered with an insulator, a braid formed on the insulator, and a sheath covered on the braid. A high-voltage cable for automobiles, comprising: a core material formed by the method described above; and a metal resistance wire wound on the core material.