JPH0741048Y2 - High voltage resistance wire for noise prevention - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a wire-wound noise-preventing high-voltage resistance wire used as an ignition cord in a mobile vehicle.

(Prior Art) A wound-type ignition cord used in an automobile or the like generally has a core layer formed by rubber extrusion coating on a tension member, and a resistance wire is wound around the outer periphery of the core layer at a predetermined pitch.
It is made by covering it with an insulator such as rubber,
Examples of the tension members include those using glass fibers (Japanese Patent Laid-Open No. 54-106884), those using aramid fibers (Japanese Patent Laid-Open No. 58-169708), and those obtained by blending the above two (actually developed). Sho 61-14424) is used.

(Problems to be solved by the invention) In the first place, the tension member is intended to be held during use or manufacturing so as not to be broken due to high tension such as bending, but on the other hand, the electrostatic characteristic which is a typical characteristic of the ignition cord is In consideration of capacity and breakdown voltage, the thinner the tension member is, the more ideal. However, the strength of glass fiber is low and therefore it cannot be made too thin, and aramid fiber has excellent tensile strength, but internal fiber-to-fiber wear (wear between aramid fibers) caused by repeated bending, vibration, etc.
Has a relatively weak side. Further, since the strength is lowered due to moisture absorption, there is a drawback that a pre-process such as drying and hydrophobization treatment is required before production and use.

The present invention focuses on the above-mentioned drawbacks of the prior art and intends to strengthen the strength of the tension member while preventing the tension member from being enlarged.

[Constitution of device]

(Means for Solving the Problems) The present invention solves the above problems by using polyarylate fibers for the tension members.

(Function) The tension member of the polyarylate fiber prevents breakage of the high-voltage resistance electric wire for noise prevention against high tension.

(Embodiment) The present invention will be shown below together with illustrated embodiments. FIG. 1 shows the structure of an embodiment of the present invention, in which the tension member 1
Is made of polyarylate, and the extrusion coating layer 2 is formed thereon as an insulating layer to form a core layer. A rubber composition in which ferrite powder or the like is mixed is used for the insulating layer. A metal resistance wire 3, for example, a nichrome wire is wound around the outer periphery of the core layer with a certain pitch so as not to contact each other, and an insulating layer 4, a braid layer 5, and a sheath layer 6 are formed on the metal resistance wire 3. The insulation cord 7 is covered, and the ignition cord 8 is completed as a winding type noise-preventing high-voltage resistance electric wire.

As shown in Table 1, the expected effect of changing the material is that the tensile strength per denier is 1.2 to 2.7 times that of conventional materials such as polyaramid and glass fiber.

Since the tension member is used by twisting extremely fine fibers, interfiber wear occurs due to bending or vibration. This remarkable improvement in properties is seen in the interfiber wear properties shown in Table 2, which is 24% higher than that of polyaramid.
Has been reinforced up to twice.

Moreover, the specific gravity is the same as that of the conventional polyaramid fiber, and the lightness is maintained.

By using such an excellent material as a constituent material, it is possible to obtain a lightweight ignition cord having excellent bending resistance and vibration resistance.

On the other hand, regarding the environmental resistance characteristics, as shown in the tensile strength after wet heat treatment in Table 3, in the case of polyarylate, the deterioration of the characteristics before and after the test by this environmental test is compared with the characteristics shown in Table 1. As can be seen, it is only 15%, and a significant improvement in environmental resistance can be seen when compared to the 55% performance degradation of conventional polyaramids under the same conditions.

Therefore, the manufacturing process does not require any special pretreatment process.
In terms of manufacturing equipment, conventional equipment can be used as is,
The tensile strength required at the time of manufacture is also equivalent to that of polyaramid fiber, so there is no resistance to switching to a new product.

As shown in FIG. 2, the tension member 1 has a structure in which polyarylate fibers having a desired thickness are twisted into one,
As in the second embodiment (FIG. 3), a plurality of polyarylate fiber bundles twisted into one may be twisted together to form one tension member 1A. The material for the tension member is polyarylate fiber as in the first embodiment, and the effect can be expected to be exactly the same as in the first embodiment.

[Effect of device]

As is clear from the above explanation, by using polyarylate as a tension member in ignition cords for mobile vehicles such as automobiles, vibration resistance and bending resistance are particularly excellent, and tensile strength and light weight are also excellent. Also has the same characteristics as those using conventional aramid fibers, and does not require a tension member drying step during manufacturing,
Moreover, it is possible to provide an ignition cord excellent in strength retention without particularly changing the conventional manufacturing equipment.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a perspective view showing an embodiment having a different tension member structure. 1, 1A ... Tension member, 2 ... Core layer, 3 ... Metal resistance wire, 7 ... Insulation coating layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-54-106884 (JP, A) JP-A-58-169708 (JP, A) JP-A-3-152804 (JP, A) JP-A-3- 159008 (JP, A) JP-A-3-226911 (JP, A) JP-A-3-226912 (JP, A) Actual opening 61-14424 (JP, U) Actual opening 4-12213 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A core layer formed by rubber extrusion coating is provided on a tension member in which fiber bundles are twisted, a metal resistance wire is wound around the outer periphery of the core layer with a constant pitch, and a rubber or resin is formed on the metal resistance wire. In a winding-type noise-preventing high-voltage resistance electric wire formed by providing an insulating coating layer consisting of one layer or multiple layers of
A winding-type noise-preventing high-voltage resistance electric wire, wherein polyarylate fiber is used for the tension member.