JP3087577B2 - Winding type noise prevention high voltage resistance wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound type noise-preventing high-voltage resistance wire used as an ignition cable for an internal combustion engine of an automobile or the like.

[0002]

2. Description of the Related Art A high-voltage resistance wire for transmitting a high voltage generated by an ignition coil through a distributor or directly to a spark plug has a small transmission loss.
It is required to have an excellent noise prevention effect and to be excellent in heat resistance and withstand voltage.Currently, a string-type high-voltage resistance wire impregnated with carbon fiber and a high winding core made of magnetic material etc. have high specific resistance. A wound high-voltage resistance wire wound with a thin metal wire is generally used.

As shown in FIG. 5, a wire-type high-voltage resistance electric wire is a reinforcing cord 5 made of aramid fiber, glass fiber or the like.
After winding a resistance wire 53 on a core 52 formed by extrusion-coating a base polymer mixed with ferrite powder on top of 1, a coating 54 was extruded on an insulating layer 54, and further covered by a braid 55 and an outermost sheath 56 in that order. One is disclosed (see Japanese Utility Model Publication No. 1-32253).

[0004]

However, in the above-mentioned wire-type high-voltage resistance electric wire, when the wire is cut and the insulating layer is peeled off, the resistance wire wound horizontally around the core is loosened. However, there is a problem that the electric wire cannot be sold alone. In order to solve such a problem, when the resistance wire is horizontally wound around the core, it is necessary to cut the resistance wire into the core (see Japanese Patent Publication No. 5-42084).

Further, when the above-mentioned wound high-voltage resistance wire is used as an ignition cable for an automobile, a conductive substance such as salt or sludge adheres to an outer peripheral portion of the cable, thereby increasing the electrostatic capacity and causing a problem in connection with a spark plug. Since there is a problem that the supply voltage is reduced, it is required to reduce the capacitance of the electric wire itself. By the way, in order to reduce the capacitance of the electric wire while keeping the outer diameter of the electric wire constant, it is necessary to reduce the conductor diameter. Electric field when the core diameter is reduced
There is a problem that the strength is increased, and dielectric breakdown occurs due to unevenness of the conductor surface formed by winding the resistance wire on the winding core, and the withstand voltage is reduced.

When electrically connecting the wound high-voltage resistance wire to a metal terminal, as shown in FIG. 6, the conductor portion (the winding core 52 and the resistance wire 53) which is stripped off of the insulating layer and exposed is bent. Since the connection is made by fitting the cylindrical metal terminal A into the outer periphery of the electric wire and fitting the cylindrical metal terminal A into this, if the conductor diameter is reduced, the contact area between the conductor portion and the metal terminal A is reduced, and a stable electrical connection is obtained. There is also a problem that there is no.

Further, if the core is made of inexpensive ethylene propylene rubber (EP rubber) or the like in order to reduce the manufacturing cost of the electric wire, such EP rubber lacks heat resistance, so that the core is deteriorated due to thermal deterioration. There is also a problem that the resistance wire is unnecessarily embedded in the winding core and a gap is formed between the metal terminal and a stable electrical connection.

Therefore, an object of the present invention is to eliminate the need to cut a resistance wire into a winding core, and to reduce the withstand voltage even when the conductor diameter is reduced in order to reduce the capacitance of the electric wire. It is an object of the present invention to provide a wire-type noise-prevention high-voltage resistance wire capable of obtaining a stable electrical connection with a terminal.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a wire-wound noise-prevention high-voltage resistance wire in which a resistance wire is wound around a winding core and an insulating layer is formed outside the resistance wire. A semi-conductive fluoro rubber is extrusion-coated between the winding core and the insulating layer on which the wire is horizontally wound to form an inner conductive layer having a smooth surface. A release layer is provided between the wires, and the release layer is peeled off at the end of the electric wire.
The inner conductive layer that has been removed and exposed is bent.
A predetermined metal terminal is fitted along the outer circumference of the wire.
Things .

The release layer can be formed of silicon oil graphite. The core is composed of a reinforcing core formed of aramid fiber and a core core composed mainly of rubber which covers the reinforcing core. Can be formed.

[0011]

The winding type noise-preventing high-voltage resistance wire constructed as described above can easily peel off the insulating layer by the presence of the release layer, and is insulated by the presence of the inner conductive layer made of semiconductive fluoro rubber. The force at the time of peeling the layer is not directly applied to the resistance wire.

In addition, since the surface of the inner conductive layer is formed smooth, even if the conductor diameter is reduced, the increase in electric field strength is reduced, and the inner terminal is electrically connected to the metal terminal via the semiconductive inner conductive layer. Since the connection is made, the contact area with the terminal does not decrease even if the conductor diameter is reduced.

Furthermore, even if the resistance wire is buried in the core due to the thermal degradation of the core which occurs when the core is formed of an inexpensive material lacking heat resistance, the presence of the inner conductor layer causes the resistance to be reduced by the presence of the inner conductive layer. There is no gap between them.

[0014]

Embodiments will be described below with reference to the drawings. As shown in FIG. 1, this wound type noise-preventing high-voltage resistance wire 10 is formed by extrusion-coating fluoro rubber mixed with ferrite powder on a three-strand reinforcing core 11 of 1000 denier aramid yarn and having an outer diameter of 1.3 mm. Semi-conductive core 1
2 and a 50 μm Ni
-The Cr resistance wire 13 is horizontally wound at 7200 turns / m. Incidentally, the mixing ratio of the ferrite powder is as follows.
400 parts by weight to 00 parts by weight. The resistance wire 1
An inner conductive layer having an outer diameter of 1.5 mm and a semiconductive fluoro rubber having a conductivity of about 1000 to 10000 Ω · Cm is extrusion-coated on the core core 12 on which the core 3 is wound horizontally. 14 are formed.

A release layer 15 is formed on the inner conductive layer 14 by silicon oil graphite, and ethylene propylene rubber is extrusion-coated on the release layer 15 to form an insulating layer having an outer diameter of 4.6 mm. 16 are formed. Further, a reinforcing braid 17 made of glass yarn is coated on the insulating layer 16, and a sheath 18 made of ethylene / propylene rubber is coated on the outside thereof.

In the wound type noise-preventing high-voltage resistance wire 10 configured as described above, the insulating layer 16 can be easily peeled off due to the presence of the release layer 15, and the inner conductive layer 14
The peeling force of the insulating layer 16 is not directly applied to the resistance wire 13 due to the presence of the insulation layer 16. In this case, the resistance wire 13 is not loosened.
Since the connection between the resistance wire 13 and the metal terminal A is made via the inner conductive layer 14 as shown in FIG. 2, the outer diameter of the conductor portion is reduced in order to reduce the capacitance of the electric wire. Even if is reduced, the presence of the inner conductive layer 14 having a smooth surface mitigates an increase in electric field strength and does not lower the withstand voltage characteristics.
Since the contact area with the metal terminal A does not become extremely small, stable electrical connection with the metal terminal A can be obtained.

FIG. 3 shows another embodiment. This wound type noise-preventing high-voltage resistance wire 20 is also formed from the reinforcing core 21, the core core 22, the resistance wire 23, the inner conductive layer 24, the release layer 25, the insulating layer 26, the reinforcing braid 27 and the sheath 28 in the same manner as in the previous embodiment. Although it is configured, some components have different materials and outer diameters. Specifically, the core 22 is made of EP
It is obtained by mixing 500 parts by weight of ferrite powder with 100 parts by weight of rubber and has an outer diameter of 1.1 mm. Also,
The resistance wire 23 is a Ni—Cr resistance wire having an outer diameter of 40 μm, and is wound horizontally around the core core 22 at 6000 turns / m. Further, the inner conductive layer 24 is formed of semiconductive fluoro rubber as in the above embodiment,
Its outer diameter is 1.3 mm. The other configuration is the same as that of the above embodiment.

As described above, the wound type noise-preventing high-voltage resistance wire 20 uses the inexpensive but inferior heat-resistant EP rubber as the base polymer of the core 22. Even if the resistance wire 23 wound horizontally is buried in the core 22, the semiconductive inner conductive layer 2 coated thereon may be used.
The presence of 4 prevents a gap from being formed between the metal terminal A and a stable electrical contact.

FIG. 4 shows still another embodiment. Similarly to the above two embodiments, this coiled noise prevention high-voltage resistance wire 30 also has a reinforcing core 31, a core core 32, a resistance wire 33, an inner conductive layer 34, a release layer 35, an insulating layer 36, a reinforcing braid 37, and a sheath. 38, but some of the components are different in material and outer diameter. Specifically, there are the following differences. First, the reinforcing core 31 is formed by twisting three aramid yarns of 400 denier. And
The core 32 is obtained by applying a fluoro rubber coating to the reinforcing core 31 and has an outer diameter of 0.6 mm.
The resistance wire 33 has an outer diameter of 4 as in the above embodiment.
It is a Ni-Cr resistance wire of 0 µm, which is horizontally wound around the core 32 at 10,000 turns / m. Further, the inner conductive layer 34 is formed of semiconductive fluoro rubber Ni as in the above embodiment, but has an outer diameter of 0.8 mm. The other configuration is the same as that of the above embodiment.

As described above, in the wound type noise-preventing high-voltage resistance wire 30, the winding core 32 is connected to the reinforcing core 3.
1, the resistance wire 33 cannot be wound horizontally so as to bite into the core core 32, but the semiconductive inner conductor coated thereon cannot be wound. Due to the presence of the layer 34, the force of peeling off the insulating layer 36 is not directly applied to the resistance wire 33, so that the resistance wire 33 is not loosened.

[0021]

As described above, the wound type noise-preventing high-voltage resistance wire of the present invention has a semiconductive fluoro rubber extruded between the winding core around which the resistance wire is horizontally wound and the insulating layer. the releasing layer between the inner conductive layer and the insulating layer together with the surface forms a smooth inner conductor layer is provided by, on the end portion side of the wire, the
The release layer is peeled off and the exposed inner conductive layer is bent.
Along the outer circumference of the wire so that
The insulation layer is easily peeled off because the insulation layer is fitted , and the peeling force is not directly applied to the resistance wire when the insulation layer is peeled off. The resistance wire does not come loose. In addition, even when the conductor diameter is reduced according to the demand for lowering the capacitance of the electric wire, the increase in the electric field strength is reduced by the presence of the inner conductive layer having a smooth surface, so that the withstand voltage characteristics do not decrease, and Since the resistance wire and the metal terminal are electrically connected via the inner conductive layer, a stable electrical connection can be obtained without using a material having excellent heat resistance especially as a material of the core. effective.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment according to the present invention.

FIG. 2 is a cross-sectional view showing a connection state with a metal terminal of the above.

FIG. 3 is a perspective view showing another embodiment.

FIG. 4 is a perspective view showing still another embodiment.

FIG. 5 is a perspective view showing a conventional example.

FIG. 6 is a cross-sectional view showing a connection state with a metal terminal of the above.

[Explanation of symbols]

 10, 20, 30 Winding type noise-preventing high-voltage resistance wires 11, 21, 31 Reinforcement core 12, 22, 32 Core core 13, 23, 33 Resistance wire 14, 24, 34 Inner conductive layer 15, 25, 35 Release layer 16, 26, 36 Insulating layer 17, 27, 37 Reinforcement braid 18, 28, 38 Sheath A Metal terminal

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A 1-211807 (JP, A) JP-A 56-107410 (JP, A) JP-A 4-181610 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H01B 7/00 304 H01B 7/02

Claims (3)

(57) [Claims] 1. A wound type noise-preventing high-voltage resistance wire in which a resistance wire is wound horizontally around a winding core and an insulating layer is formed on the outside of the resistance wire, wherein the resistance wire is wound horizontally between the winding core and the insulation layer. To
The semi-conductive fluororubber surface by extrusion coating to form a smooth inner conductive layer, providing a releasing layer between the insulating layer and the inner conductive layer, on the end side of the wire, the The release layer is peeled off and exposed
The inner conductive layer is formed along the outer periphery of the wire so as to be bent.
And a predetermined metal terminal is fitted into the wire. 2. The high voltage resistance wire according to claim 1, wherein the release layer is formed of silicon oil graphite. 3. The wound type noise prevention device according to claim 1, wherein the winding core is formed by a reinforcing core formed of aramid fiber and a core core containing rubber as a main component and covering the reinforcing core. High voltage resistance wire.