JPS58142707A - Wound-resistance wire for preventing radio wave noise - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a winding resistance wire for use in the ignition circuit of an internal combustion engine to prevent wave noise. .

Traditionally, it has been used to prevent radio noise generated in the ignition circuit of internal combustion engines1.
In order to reduce noise, wire-wound resistance wires have been put into practical use by adding an inductor to reduce the noise current. This wire-wound resistance wire is made of magnetic material and 17 ferrite for noise prevention.The base rubber is EPDM, acrylic rubber is used, and the core material is made of glass fiber and polyamide fiber. It consists of a complete winding of resistance wire [7] and an insulating coating on the outer periphery. In particular, internal combustion engines need to be able to withstand a wide range of environmental conditions from -40°C to 180°C, so heat-resistant silicone rubber-coated wires are used for the outer insulation coating layer1. However, in the case of this silicone rubber coated electric wire, the outer diameter force of the magnetic material mixture is 2.0 because of the noise prevention effect -L.
MlφIW VCi was subjected to a winding test under l durability conditions (after being left in an electric field for 48 hours at 180'C, it was wound around a rod with a diameter of 18jQIφ to check for abnormalities), and cracks were found from inside. , there was a problem that the wire would break if it was bent forcibly due to breakage, etc.j7. When forming the entire silicone rubber layer directly on the winding core with 16 turns of the shredded magnetic material mixture, the adhesion is poor and bubbles may be formed in some areas. Problems associated with corona discharge are likely to occur.

The object of the present invention is to provide a wire-wound resistance wire that is noise-proof, does not cause deterioration of young fruit, prevents the generation of bubbles during production, and has excellent durability. A magnetic substance mixture is coated around the core member of the core member so that the outer diameter of the mixture is 2.01118φ or more, a resistance wire is wound around the outer periphery of the core member, and a radio noise prevention 1F winding is made of a silicone rubber coating 1-. The wire resistance wire is characterized in that silicone rubber is used as the base rubber of the magnetic material mixture.

The present invention improves wettability with the silicone rubber coating layer of the outer cover by changing the rubber material of the magnetic mixture to an all-silicon rubber system, and the mixture is coated entirely on the outer periphery of the core member or molded by extrusion method. Occasionally, the generation of bubbles can be prevented. In addition, since the blending ratio of the magnetic substance mixture has a limit depending on the base rubber material, it is necessary to change the blending ratio of the magnetic substance in the mixture.
The blending ratio of the magnetic material is 87% or less in terms of total weight ratio. If the magnetic material is added to the blade, it will be too hard, resulting in poor molding and poor burnability, and if it is less than 50%, the noise prevention effect will be poor and regulations will not be met. In some cases, polyamide fibers are used in place of glass fibers in order to reduce conut.1 When the entire magnetic mixture layer is applied directly to the outside of the polyamide fibers or extruded, (1) The combination of the fibers and the magnetic mixture is Adhesion is poor and the pull-out strength between the terminal fitting and tuF, #I is reduced.

(2) Since the finished product is soft, from the center core member to the outermost silicone rubber coated tube, there is no stiffness between the wires and 17, and in actual use, they may sag and come into contact with a part of the engine, causing vibration. In some cases, cracks appear in the electric wires.

As a countermeasure, providing a polyamide sheath layer with a high melting point between the polyamide fibers that form the core member and the magnetic mixture layer will compensate for the irregularities of the inner fibers and improve the adhesion with the magnetic mixture layer on the outside. The above problem can be resolved. The polyamide (nylon) sheath used here has a melting point of at least 200"C or higher and a wall thickness of 0.4H to prevent it from eluting under the usage conditions of silicone rubber coated wires.
The above must be able to be manufactured by extrusion molding. Additionally, by using a hard nylon sheath, the diameter of the glass or polyamide fiber core can be made smaller, so the actual inner diameter of the magnetic material mixture can be made smaller, and the wall thickness is thicker, which is advantageous in terms of noise prevention effect. Figure 1 shows a wire-wound resistance wire of conventional dimensions and structure, with a resistance of 2.7 degrees or less.
Acrylic rubber and 82
A magnetic substance mixture 2 made of ferrite powder is coated with an outer diameter of 3.5 mm and 1~, and a resistance wire 3 is wound thereon, and its outer periphery is covered with a silicone rubber coating layer 4 with an outer diameter of 3.5 mm and 1 mm. 7
．． 0#φ's 'lqfMAe'? ：＋、、In contrast to this, the present invention, as shown in FIG. outer diameter 9.5
ytttttφ, the resistance wire 8 and the silicone rubber coating layer 4 are all formed in the same way, and the outer diameter is 7. Ontφ electric wire B
make. Alternatively, as shown in FIG. 3, a core member 11 of 1.15 mmφ made of twisted wires of polyamide fibers is made, and the core member is covered with a polyamide sheath 5 made of thermoplastic resin to an outer diameter of 2.2 mmφ. Similarly, a silicone rubber-based magnetic mixture 12 is molded into a 3.5yφVC, and coated with a resistance wire 3 and a silicone rubber coating layer 4VC to give an outer diameter of 7.5yφ.
Create line C of 0 wzφ.

Next, regarding the durability test, sample A-0 of the above electric wire
(L: As an additional sample to 4, the sample was made of polyamide fiber and nylon sheath (melting point 185'C) instead of glass fiber.
) or the nylon sheath of sample C A41
Table 1 shows the results of a durability test using Sample E?, which was heated to 185°C for 205"C per point. As a result, it was found that silicone rubber was used for the glass fiber core member and the magnetic material mixture. Sample B satisfies the durability test, and the polyamide fiber core material has a nylon sheath with a melting point of at least 2.
00'C (sample C) is required, and the sheath thickness is also 0.
It has been confirmed that 4 or more birds are required. 1 As described above, the winding resistance wire of the present invention has a noise prevention effect by making the outer diameter of the magnetic material mixture 2.0 mm in total, and the magnetic material of the silicon rubber thread has a noise prevention effect. By using the mixture, +III) the durability can be improved, and (iv) it is possible to improve the durability of the polyamide fiber core member.
By covering the core member with a $fil plastic resin sheath material having a melting point of Durability12, cost reduction1. A wire-wound resistance wire is obtained.

[Brief explanation of the drawing]

Figure 1 shows a conventional wire-wound resistance wire, Figure 1 (+1) is a partially cutaway perspective view, Figure 1 (b) is a side view, Figures 2 and 3. 2 shows the wire-wound resistance wire of the present invention, FIG. 2 (al is a partially cutaway perspective view showing one embodiment, FIG. FIG. 3 is a similar partially cutaway perspective view showing an embodiment of the invention (bl is a side view thereof).

Claims (3)

[Claims] (1) A magnetic mixture is coated around a core member of glass fiber, ash, or polyamide fiber, and the outer diameter of the mixture is made to be 2.OHφ or more, and a resistance wire is completely wound around the outer periphery of the silicone rubber. 1. A wire-wound resistance wire for preventing radio noise, characterized in that the wire-wound resistance wire for preventing radio noise is coated with silicone rubber on the pace rubber of the magnetic substance mixture. (2) A magnetic mixture is coated around the core member of the lath conductor, the polyamide m fiber, and the outer diameter of the mixture is 2, On
In a wire-wound resistance wire for preventing radio noise, which has a diameter of φ or more, has a resistor fully wound around its outer periphery, and is coated with silicone rubber, the core member and the magnetic mixture are used as a reinforcing material for the core member of the magnetic mixture. between 200'C and above melting point and 0.4
A wire-wound resistance wire for preventing radio noise, which is characterized by interposing a plastic resin having a wall thickness of N or more. (3) Claim 1 or 2, characterized in that the magnetic substance mixture has an acid content of the magnetic substance of 87 to 50% based on the total weight of the silicon film and the magnetic substance. Wire-wound resistance force M for preventing radio noise as described in any of the paragraphs