JP3728792B2 - Conductive cable - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a conductive cable for preventing generation of noise and electrical disconnection, and more particularly to a conductive cable suitable for transmission of a pulse current in an ignition system of an internal combustion engine.
[0002]
[Prior art]
In an ignition system of an internal combustion engine, a pulse current generated by an ignition coil is transmitted through a conductive cable, and a spark is generated by a spark plug to ignite. Since the pulse current is an intermittent current, harmful electromagnetic waves that cause noise are likely to be generated, and when noise is generated, malfunction of a control system or noise of a communication system occurs. If the cable is disconnected, the ignition operation cannot be performed.
[0003]
Conventionally, in order to improve such a point, there is known a cable in which a coil-shaped conductor wound around an insulating core is covered with a conductive film, and the covering is spirally combined and covered with an insulator. (USP No. 5,397,860).
[0004]
However, in this cable, since the coil-shaped conductor is covered with a conductive coating, the entire cable becomes a cylindrical conductor, and the noise prevention effect of the coil is reduced. In addition, even if one conductor is broken, current flows through the conductive coating, so that conduction of the entire cable is not interrupted. However, when the resistance of the conductive coating is large, transmission of pulse current is limited. is there.
[0005]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to prevent the generation of noise and to transmit a large current, and to prevent a physical disconnection from occurring. And providing a conductive cable capable of detection.
[0006]
[Means for Solving the Problems]
The present invention is the following conductive cable.
(1) a stranded wire in which a plurality of coil members each having a coiled wire wound along the outer periphery of the insulating core are combined so that the coiled wires come into contact with each other;
An insulating bonding material that fills the gap formed between the pitches of the coil-shaped conductors, and fixes and integrates the stranded coil-shaped conductors in contact with each other;
An electrically conductive cable having an insulative covering material covering a stranded wire integrated with a binding material.
(2) The conductive cable according to the above (1), further comprising a reinforcing knit material surrounding the insulating coating material and / or an insulating sheath covering the knit material.
(3) The conductive cable according to the above (1) or (2), further comprising a first terminal connected to one end of the plurality of coiled conductive wires forming the stranded wire and a second terminal connected to the other end.
(4) The conductive cable according to any one of (1) to (3), wherein the conductive cable is for an ignition system of an internal combustion engine.
[0007]
Examples of the conductive wire used for the conductive cable of the present invention include copper, copper alloy (for example, nickel-copper alloy), stainless steel and the like. Nickel-copper alloy, stainless steel and the like have low electric resistance and mechanical strength. Is preferable. These conductive wires are wound in a coil shape along the outer periphery of the insulating core so as to form a gap between the pitches, thereby forming a coil member.
[0008]
The insulating core is preferably a long linear and electrically inactive, flexible and heat resistant. Such an insulating core is preferably a string-like one in which fibers such as glass fibers and aramid fibers are bundled. The cross-sectional shape of the insulating core is preferably circular or close to this, and its diameter is suitably about 0.5 to 3 mm.
[0009]
The above-mentioned conductor is wound in a coil shape so as to keep a gap between the pitches along the outer circumference of the insulating core to form a coil member. Thereby, a flexible coil member is formed. The number of turns is preferably 20 to 60 turns per 1 cm of the coil member.
[0010]
A plurality of such coil members, for example, two or three, are combined in a spiral shape so that adjacent coil-shaped conductors are in contact with each other, thereby forming a stranded wire. In this state, the insulating bonding material fills the gap between the pitches of the coil-shaped conductors, and the stranded coil-shaped conductors are fixedly joined in a contact state to form a stranded wire. The number of coil members is 5 to 25 times per 30 cm, preferably about 10 to 20 times. The winding direction of the conducting wire in each coil member constituting the stranded wire may be different, but is preferably the same direction.
[0011]
Such an integrated stranded wire can be manufactured by forming a stranded wire by combining the coil members and then covering the whole with a binding material. Conversely, in a state where the gap is filled by covering with the binder at the stage of forming the coil member, a plurality of coil members are twisted together in a state where the binder is uncured to bring the coil-shaped conductive wires into contact with each other. It can also be produced by forming a twisted wire and curing the binder.
[0012]
As the insulating bonding material, an insulating material having a bonding force such as an adhesive, a resin, or an elastomer can be used, but a material having flexibility so as to follow the movement of the stranded wire is preferable. These binders are preferably those which are coated as a liquid with a suitable solvent and then cured by removing the solvent. Examples of such a solution-type binder include latex and resin coating agents.
[0013]
The conductive cable of the present invention is obtained by coating a stranded wire integrated with a binding material as described above with an insulating coating material. As the insulating coating material, those conventionally used as a coating material such as rubber and resin can be used, and silicon rubber, EPDM and the like are particularly preferable. It is preferable that the covering with the insulating coating material is embedded and integrated in a mold shape so that the stranded wire does not move inside. The conductive cable thus obtained has a circular cross-sectional shape, and its diameter is preferably 5 to 10 mm.
[0014]
Such conductive cables are preferably further reinforced and / or protected by covering with a knitted material and / or an insulating sheath. The knitted material is preferably made of fibers such as glass fibers and aramid fibers. The insulating sheath can be the same as the insulating coating material.
[0015]
The above-mentioned conductive cable has first and second terminals attached to both ends thereof, and electrically connects the respective conductors wound around a plurality of coil members constituting the respective wires, for example, for an ignition system of an internal combustion engine. Can be used as a conductive cable. The conductive cable of the present invention is excellent as a conductive cable in an ignition system of an internal combustion engine, but can be used for other applications.
[0016]
The conductive cable of the present invention is used for transmitting a current such as a pulse current by connecting the first and second terminals to the power supply side and the load side. For example, when used in an ignition system of an internal combustion engine, a first terminal is connected to the ignition coil side, a second terminal is connected to the ignition plug side, and a pulse current is transmitted from the ignition coil side to the ignition plug side.
[0017]
In this case, the pulse current is shunted from the first terminal to the plurality of coiled conductors connected thereto, and is supplied to the spark plug from the second terminal. In this case, since the coiled conductors are connected in parallel, a large current can be transmitted.
[0018]
Since the pulse current is intermittently supplied, a high-frequency noise component is likely to be generated with the repetition of ON / OFF, but since each conductor is wound in a coil shape to form a coil, its reactance is increased. As a result, the high-frequency current is cut off and the generation of noise is prevented.
[0019]
The conductor is wound in a coil shape around the insulating core, so it is harder to break than in the case of a straight line.In addition, it is harder to break because it is combined with a binder in a coiled state and integrated. The tendency is further increased by embedding and sealing with an insulating covering material. However, even if one conductor is broken, the current is prevented from being interrupted because the conductor is in contact with another adjacent conductor.
[0020]
In this case, the resistance of the entire conductive cable increases, and if it is used as it is, the whole will be easily broken.However, the increase in resistance can be detected at the time of regular inspection, so the disconnection can be checked and the conductive cable can be replaced early. Become.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
1A and 1B show a conductive cable according to an embodiment applied to an ignition system of an internal combustion engine, wherein FIG. 1A is an overall front view, and FIG. 1B is a sectional view taken along line AA.
[0022]
In FIG. 1, reference numeral 1 denotes a conductive cable, and a plurality of coil members 4a, 4b having coiled conductors 3a, 3b wound along the outer circumference of the insulating cores 2a, 2b are connected to the coiled conductors 3a, 3b. The stranded wires 5 that are brought together so that they come into contact with each other are filled with the bonding material 6 to fill the gap formed between the pitches of the coiled conductors 3a and 3b, and the stranded coiled conductors 3a and 3b are brought into contact with each other. The integrated stranded wire is fixed and integrated, and the integrated stranded wire is embedded and covered with an insulating coating material 7.
[0023]
As the conductive cable, a cable having the above configuration can be used as a finished product. In this embodiment, a reinforcing knitting material 8 covering the periphery of the insulating covering material 7 and an insulating sheath covering the periphery of the knitting material 8 are further provided. 9 are provided.
[0024]
The conductive cable 1 has a first terminal 11a connected to one end of a plurality of coiled conductive wires 3a and 3b forming the stranded wire 5 and a second terminal 11b connected to the other end at both ends. These first and second terminals 11a and 11b are attached to both ends of the conductive cable 1 by caulking portions 12a and 12b such that the coiled conductive wires 3a and 3b of the stranded wire 5 come into contact with the terminals 11a and 11b. Spring members 13a and 13b are formed so as to press the contacts 14a and 14b.
[0025]
As the conductive wires 3a and 3b used in the above-described conductive cable 1, those having low electric resistance and high mechanical strength, such as nickel-copper alloy and stainless steel, are used. These conductors are wound in a coil shape along the outer periphery of the insulating cores 2a and 2b so as to form a gap between the pitches, thereby forming coil members 4a and 4b.
[0026]
As the insulating cores 2a and 2b, a long linear and electrically inactive, string-like material in which fibers such as glass fiber and aramid fiber are bundled so as to have flexibility and heat resistance is used. The cross-sectional shape of the insulating cores 2a and 2b is a circular shape or a shape close thereto.
[0027]
When the conductive wires 3a, 3b are wound around the bundle of fibers so as to keep a gap between the pitches along the outer circumference of the insulating cores 2a, 2b, the coil members 4a, 4b is formed.
[0028]
Two such coil members 4a and 4b are spirally joined so that the adjacent coiled conductive wires 3a and 3b are in contact with each other to form a stranded wire 5. In this state, the insulating bonding material 6 fills the gap between the pitches of the coil-shaped conductors 3a and 3b, and the stranded coil-shaped conductors 3a and 3b are fixed to each other in a contact state and integrated. Line 5 is formed. As the insulating binder 6, latex, a resin coating agent, or the like is used.
[0029]
The conductive cable 1 is formed by covering a stranded wire 5 integrated with a binding material 6 with an insulating covering material 7. Silicon rubber, EPDM, or the like is used as the insulating coating material. The covering with the insulating covering material 7 is embedded and sealed in a mold shape so as not to move the stranded wire 5, and is integrated with the stranded wire 5.
[0030]
Such a conductive cable 1 is further reinforced and protected by covering with a knitted material 8 and an insulating sheath 9. As the knitting material 8, a material made of fiber such as glass fiber or aramid fiber is used. The insulating sheath 9 is the same as the insulating covering material 7.
[0031]
The conductive cable 1 has first and second terminals 11a and 11b attached to both ends thereof, and each of the conductors 3a wound around a plurality of coil members 4a and 4b constituting the stranded wire 5 at caulking portions 12a and 12b, respectively. , 3b are fixed so as to be electrically connected to form a conductive cable for an ignition system of an internal combustion engine.
[0032]
The conductive cable 1 is connected to the first and second terminals 11a and 11b on the power supply side and the load side, and is used for transmission of current such as pulse current. That is, when used in an ignition system of an internal combustion engine, the first terminal 11a is connected to the ignition coil side by a contact 14a, the second terminal 11b is connected to the ignition plug side by a contact 14b, and the ignition coil side is connected to the ignition plug side. To transmit the pulse current.
[0033]
In this case, the pulse current is split from the first terminal 11a to a plurality of coiled conductive wires 3a and 3b connected thereto, and is supplied to the spark plug from the second terminal 11b. In this case, since the coiled conductors 3a and 3b are connected in parallel, a large current can be transmitted.
[0034]
Since the pulse current is intermittently supplied, a high-frequency noise component is likely to be generated with repeated ON-OFF, but each of the conductive wires 3a and 3b is wound in a coil shape to form a coil. The high-frequency current is cut off to prevent noise.
[0035]
Since the conducting wires 3a and 3b are wound around the insulating cores 2a and 2b in a coil shape, they are less likely to be disconnected than in the case of a straight line, and are coupled and integrated by a binding material 6 in a coiled state. Therefore, the disconnection is more difficult, and the tendency is further increased by embedding and sealing with the insulating covering material 7. In this case, even if one conductor 3a is broken, interruption of current is prevented because it is in contact with another conductor 3b adjacent thereto.
[0036]
In this case, the resistance of the entire conductive cable 1 becomes large, and if it is used as it is, the entire cable is easily disconnected. Will be possible.
[0037]
Although the above embodiment is used for the ignition system of an internal combustion engine, it can be used as a conductive cable for transmitting a pulse current or other current for other uses.
[0038]
【The invention's effect】
In the conductive cable of the present invention, a plurality of coil members are aligned so that the coiled conductors are in contact with each other, and the stranded wire bonded with the insulating bonding material is covered with the insulating coating material, thereby preventing the generation of noise. Thus, it is possible to obtain a conductive cable capable of transmitting a large current, and hardly causing a disconnection, and capable of transmitting and detecting a current even if the disconnection occurs.
[0039]
By further covering the above-mentioned conductive cable with a knitted material and / or an insulating sheath, reinforcement and / or protection are enhanced.
[Brief description of the drawings]
1A and 1B show a conductive cable according to an embodiment, wherein FIG. 1A is an overall front view, and FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conductive cable 2a, 2b Insulating core 3a, 3b Conducting wire 4a, 4b Coil member 5 Stranded wire 6 Bonding material 7 Insulating coating material 8 Knitting material 9 Sheath 11a, 11b Terminal 12a, 12b Crimped portions 13a, 13b Spring materials 14a, 14b contact

Claims (4)

A plurality of coil members each having a coiled conductor wound around the outer periphery of the insulating core, and a twisted wire that more closely matches the coiled conductors;
An insulating bonding material that fills the gap formed between the pitches of the coil-shaped conductors, and fixes and integrates the stranded coil-shaped conductors in contact with each other;
An electrically conductive cable having an insulative covering material covering a stranded wire integrated with a binding material. The conductive cable according to claim 1, further comprising a reinforcing knitted material covering the periphery of the insulating covering material and / or an insulating sheath covering the periphery of the knitted material. The conductive cable according to claim 1, further comprising a first terminal connected to one end of the plurality of coiled conductive wires forming the stranded wire and a second terminal connected to the other end. 4. The conductive cable according to claim 1, wherein the conductive cable is for an ignition system of an internal combustion engine.

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