JPH066418Y2 - Wire wound type high voltage resistance wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a noise disturbance in an internal combustion engine of an automobile or the like by propagating noise electric waves generated by discharge ignition into the air through the electric wire itself. The present invention relates to a high-voltage resistance electric wire for suppressing the occurrence of a wire, and particularly to a wire-wound high-voltage resistance electric wire (hereinafter simply referred to as an electric wire) in which a metal resistance wire is wound around a winding core.

(Prior Art) Conventionally, this type of electric wire is generated by the impedance of the electric wire by winding a metal resistance wire around a winding core in which magnetic iron powder is kneaded, as in Japanese Patent Publication No. 44-15452. It is known to attenuate the noise prevention current.

On the other hand, in order to increase the impedance per unit length of the resistance wire, the diameter of the resistance wire to be wound is reduced, or
Alternatively, the number of turns per unit length should be increased. In Applicant's Japanese Utility Model No. 61-14424, a fiber core is coated with a rubber mixed with ferrite powder, and a resistance wire having an outer diameter of about 0.06 mm is provided on the core.
As the disclosure of an electric wire wound at a constant pitch of 08 mm and having an insulating layer provided on it, the resistance wire cannot be made very thin in manufacturing, so the number of turns per unit length is increased, and the maximum length is wound. Attempts have been made to improve the noise prevention performance by tightly winding the resistance wires until adjacent resistance wires come into contact with each other.

(Problems to be solved by the invention) However, if the resistance wires are wound so densely that they come into contact with each other, a current will flow through the contact portions, the impedance value will change, and the noise prevention performance will deteriorate.

In order to prevent the resistance wire from contacting, the metal resistance wire in Incorporated No. 54-52087 is coated with an insulation coating (t = 0.01 mm) and the electrically insulated metal resistance wire is wound around the core. In addition, in Japanese Patent Publication No. Sho 43-30257, an electric wire with an insulation coating around a metal resistance wire spirally wound on the flexible insulated wire core and Japanese Examined Patent Publication No. Sho 45-14737 is used. As described above, there is known an electric wire in which an insulating tape is wound around the outer circumferential surface of a single-winding conductor formed by winding a resistance conductor around the core or covered by vertical alignment. At the time of connecting the terminal fittings, it is necessary to remove the insulating coating by some method, which makes connecting the terminal fittings very difficult.

In addition, Japanese Utility Model Publication No. 54-171184 is an electric wire wound in a spiral shape by adhering or adhering carbon fiber to a winding body, and this technical improvement, No. 55-136108, is a resistance wire. , Carbon fiber (diameter 0.4 to 0.5 mm) is semi-conductive
This is an electric wire that is made by winding a core fixed with an adhesive or adhesive that imparts conductivity and magnetic permeability.The resistance wire itself has a large diameter and prevents the carbon fibers from fraying. Therefore, it is a technique of fixing with an adhesive containing a semi-conductive material, not a technique of tightly winding the resistance wire.

Further, there is the following technique in which a semiconductive layer is provided on the outer circumference of a conductor core wire formed by winding a resistance wire on the core.

Jitsuko Sho 43-23621 is a wire that has a low-insulation coating that contains high-permeability particles on top of the resistance wire, and this coating has good absorption of high-frequency current and can prevent the generation of noise radio waves.

In Japanese Utility Model Publication No. 44-26678, a low-insulating layer made of resin mixed with high-permeability particles and high-conductivity particles is provided on the resistance wire to absorb high-frequency current and prevent generation of noise radio waves. Electric wire.

No. 57-33023 is a low-capacity electric wire with a conductive core coated with a semi-conductive paint on top of the resistance wire.

No. 51-1778 is a semi-conductive layer provided above the resistance wire as an absorption layer for noise radio waves, and has a thickness of 0.05 to 0.1 mm and a resistance value of 0.5 to 500 MΩ / m. An electric wire that can obtain electrical contact without hindrance to high-voltage current even if terminals are directly attached to the conductive layer.

In JP-A-60-3809, a conductive silicone rubber (volume specific resistance 3.5 to 5 Ω · cm) is coated on the resistance wire (t = 0.13 to
0.2), the gap between the resistance wires is also filled to prevent the occurrence of contact points between the resistance wires, stabilize the resistance value, reduce the variation width, and directly connect the terminals for electrical connection. An electric wire that can make contact.

The prior arts 1 to 3 have a drawback that the resistance wire cannot be prevented from being contacted since the resistance wire is wound on the winding core and then the semiconductive material is coated or applied from the outer periphery of the resistance wire. In addition, the thickness of the coating is also increased, and there is a limit in reducing the winding pitch. Although it is not a technique of densely winding the resistance wire itself like the above-mentioned technique, in Japanese Patent Publication No. 43-5065, a winding is made by winding a resistance conductor on the core of the primary winding and coating the magnetic material on it. There is a disclosure of an electric wire wound spirally on the outer peripheral surface.

In addition, Japanese Utility Model Laid-Open No. 57-67314 has a wire connection structure of a conductor core wire and a connection terminal, and has a bent connection and a connection provided with a connection piece at the terminal. The present invention is a technical device capable of easily performing the work of bending connection.

Although not directly related to the present invention, in order to improve the terminal fixing force, an adhesive is used between the coating layers.
Also, the technology of Japanese Utility Model Laid-Open No. 56-150011, in which a separator layer is provided for easy peeling, is also a reference for bending connection technology.

(Means for solving the problem) The wire-wound high-voltage resistance wire of the present invention is made of metal so that the metal resistance wire can be densely wound around the core and the terminal metal fitting can be easily connected. Outside of the resistance wire itself,
By winding a semi-conductive resin-coated resistance wire having a specific resistance value of 10 ² Ω · cm to 10 ⁵ Ω · cm and a coating layer having a thickness of 4 μm to 8 μm on a winding core. The above problem is to be solved.

(Operation) Even if the resistance wires are densely wound by the above-mentioned means so that they are in contact with each other, the thickness is 4 μ to 8 μ and the specific resistance value is 10 ² Ω · cm
Due to the semi-conductive coating layer of 10 ⁵ Ω · cm, the current flowing through the contact portion is 1% or less of the current flowing through the resistance wire, and the contact resistance value with the terminal fitting is 1 KΩ or less.

(Embodiment) FIG. 1 and FIG. 2 show an embodiment of the present invention. Reference numeral 1 is a tension member made of aramid fiber or the like, on which a core 2 (in the embodiment, a core diameter of 1.3 mm) formed by extrusion coating silicon rubber in which ferrite powder is kneaded is formed. 3 is a resistance wire (a resistance wire diameter of 0.055 mm in the embodiment) made of metal such as a stainless wire, and a semiconductive coating layer 7 (a coating thickness of 0.004 to 0.008 in the embodiment) on the resistance wire 3.
mm) has been applied.

The coating layer 7 is formed by mixing carbon in an epoxy resin and coating the resistance wire 3 with a uniform thickness by dipping or the like.

The semiconductive resin-coated resistance wires provided with the coating layer 7 are in close contact with each other on the winding core 2 (in the embodiment, the number of turns is 14,000 turns / m ...
The pitch is about 0.07mm). 4 is an insulating layer made of EP rubber or the like, 5 is a braid made of glass fiber,
6 is an outermost sheath made of silicone rubber or the like.

FIG. 3 shows a connection structure with the terminal metal fitting A connected to the end of the electric wire described in FIGS. 1 and 2, and exposes the core 2 around which the resistance wire 3 is wound. Then, the winding core is bent on the outermost sheath 6, and the portion is crimped together with the electric wire by the holding portion h of the terminal fitting A, so that the resistance wire 3 and the terminal fitting A are electrically connected.

In addition, since the electric wire of the present invention does not change the impedance value even when the wound resistance wire comes into contact with it and the connection with the terminal fitting is easy, The specific resistance value of the coating layer 7 is limited.

First, regarding the thickness of the coating layer 7, if the thickness is less than 4.0 μm, it is difficult to manufacture, so the lower limit value is 4.0 μm.
It was adopted. Also, as the coating thickness increases, the number of windings per unit length decreases, so there is a limit of up to 8.0 μm.
The upper limit of 8.0 μm was adopted.

On the other hand, if the current flowing through the contact portion at the time of contact with the resistance wire is 1% or less of the current flowing through the resistance wire, the impedance value does not change significantly. In order to make the flowing current 1% or less, the specific resistance value of the coating layer 7 needs to be 10 ² Ω · cm or more.

However, if the specific resistance value becomes large, for example,
When the connection structure shown in the figure is adopted, the contact resistance increases, so that the upper limit must be limited to enable easy connection to the terminal fitting.

Table 1 shows the experimental results of determining the upper limit, and the coating layer 7
The contact resistance with each of the terminal fittings was changed by changing the specific resistance value by adjusting the amount of carbon to be mixed in according to the thickness.

The structure shown in Fig. 3 was used for the connection structure with the terminal fittings.

Generally, this type of electric wire is required to have a contact resistance of 1 KΩ or less, and the upper limit of the specific resistance value satisfying the above requirement after the coating thickness of the coating layer 7 is limited is 10 ⁵ Ω.
・ It is assumed to be cm.

(Effects of the Invention) As described above, according to the present application, since the semiconductive coating layer having the specific resistance value and the coating thickness within the predetermined range is provided on the resistance wire, the windings are densely wound to form the semiconductive resin coating resistance. The impedance value does not change even if the wires come into contact with each other, stable noise prevention performance can be obtained, and the terminals can be easily connected to the terminals without any special terminal processing. The practical value that can be achieved is enormous.

[Brief description of drawings]

FIG. 1 is a perspective view showing an electric wire of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a partial sectional view showing a usage state of the electric wire of the present invention. 2 ... winding core, 3 ... resistance wire, 7 ... coating layer, A ... terminal fitting

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-3809 (JP, A) Actual opening S51-1778 (JP, U) Actual opening S52-134664 (JP, U) Actual opening S54- 52087 (JP, U) Actual opening Sho 54-171184 (JP, U) Actual opening Sho 55-136108 (JP, U) Actual opening Sho 56-150011 (JP, U) Actual opening Sho 57-33023 (JP, U) 57-67314 (JP, U) 61-14424 (JP, U) JP43-5065 (JP, B1) JP43-30257 (JP, B1) JP-B-44-15452 (JP, B1) JP-B-45-14737 (JP, B1) JP-B 43-23621 (JP, Y1) JP-B 44-26678 (JP-Y1)

Claims (2)

[Scope of utility model registration request] 1. A winding core (2) in which a tension member made of aramid fiber or the like is coated with rubber mixed with magnetic powder around the tension member.
In a wire-wound high-voltage resistance wire in which a metallic resistance wire is wound around and an insulating layer is provided on the outer side thereof, a specific resistance value of 10 ² Ω · is provided outside the metallic resistance wire (3) itself. cm-10
⁵ Ω · cm semi-conductive resin with a thickness of 4 μm to 8 μm
(7) is provided, and the semiconductive resin-coated resistance wire is tightly wound in the axial direction, and a wire-wound high-voltage resistance wire is provided. 2. The wire-wound high-voltage resistance electric wire according to claim 1, wherein the winding core is bent on the surface of the electric wire and the terminal metal fitting is brought into contact with the resistance wire for connection in the end of the electric wire.