JP2006097668A - Ignition plug cord - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve combustion efficiency of an internal combustion engine by lowering an electric resistance value at a ground wire part for increasing accumulation energy quantity at a capacitor function part. <P>SOLUTION: This ignition plug cord is provided with a cord main body 1 in which inner wires 1c coated with insulation 1d-1f are electrically connected to an ignition plug connection metal fitting 3 at one end, and to a power side connection metal fitting 5 at the other end, a capacitor forming a capacitor electrode of a conductor 9 covering a prescribed length range of the outer circumference of the cord main body 1 and the inner wires 1c, and the ground wire part 11 provided on the conductor 9 as a ground side electrode for the capacitor. The ground wire part 11 is formed of ground core wires 11a having conductivity, and a flat mesh wire 11b enclosing the outer circumference of the ground core wires 11a. The cord main body 1 is formed of core materials 1a formed of glass fibers, conductive conductors 1b covering the outer circumference of the core materials 1a, the inner wires 1c spirally wound around the outer circumference of the conductive conductor 1b, and the insulation 1d-1f covering the inner wires 1c. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a spark plug cord that can improve the performance of an internal combustion engine such as a motorcycle, an outboard motor, and an automobile to complete combustion or nearly as close as possible.

Conventionally, as a technique related to an ignition plug cord as an ignition tuning part of an internal combustion engine, for example, a technique described in Japanese Patent No. 3534708 (hereinafter referred to as “patent document”) is known. In this known invention, as shown in FIG. 7, an ignition coil 01 and an ignition plug 03 screwed into a cylinder head 02 are electrically connected by a cord body 04. The cord body 04 has a sectional structure thereof. In order from the center to the outside, the center fiber, the cover, the spiral wound wire as the metal core wire, and the insulator that covers the spiral wound wire are arranged, and the structure is ignited through the spiral wound wire. A current flows from the coil 01 to the spark plug 03. On the other hand, the cord body 04 is wrapped by a conductor 05 made of a braided copper wire over a predetermined length of an intermediate portion thereof, and a capacitor electrode is formed by the spirally wound wire and the conductor 05. The portion of the conductor 05 that does not enclose the cord main body 04 branches off from the cord main body 04 and is grounded to the cylinder head 02 as a ground wire portion 05a by bolt fastening. In the ignition system thus formed, the spirally wound wire and the conductor 05 are formed as a capacitor electrode with the insulation coating body of the cord body 04 sandwiched therebetween, so that the current generated in the ignition coil 01 during operation of the internal combustion engine Thus, the energy stored in the capacitor is discharged and the stored energy is discharged to the spark plug 03 in an instant. As a result, the spark duration in the spark plug 03 is short and strong to improve the performance of the internal combustion engine.
Japanese Patent No. 3534708

  However, the spark plug cord having the capacitor function as described above has a configuration in which the outer periphery of the cover covering the central fiber is simply wrapped with the spiral wound wire. There is a problem that the value is large and there is a certain limit in shortening the discharge time of the stored energy, and as a result, the potential of the internal combustion engine is prevented from being increased. In addition, since the ground wire portion 05a only has the extension portion of the conductor 05, which is a braided conductor wire, fastened to the cylinder head 02, the electrical resistance is large, so that the amount of energy stored in the capacitor that repeats charging and discharging is limited. There is also a problem. Furthermore, since the conductor 05 and the ground wire part 05a in the part forming the capacitor electrode are exposed to the outside as they are, there is a problem of giving noise caused by electromagnetic waves harmful to electrical components such as acoustic equipment. is there. In order to solve such problems, the energy stored in the capacitor function unit is transmitted to the spark plug by the ultra-low resistance function, and the electric resistance value in the ground wire portion is lowered to reduce the energy stored in the capacitor function unit. It is an object of the present invention to provide an ignition plug cord that can increase the amount and improve the combustion efficiency of the internal combustion engine to efficiently extract the potential.

  In order to solve the above problems, the following measures are taken in the present invention. That is, the invention according to claim 1 is an ignition plug cord, wherein one end of the internal wire covered with the insulator is electrically connected to the ignition plug connection fitting, and the other end of the internal wire is electrically connected to the power supply side connection fitting. A cord body, a conductor that wraps a range over a predetermined length of the outer circumference of the cord body, a capacitor that forms a capacitor electrode with the internal wire, and a ground wire portion that is provided on the conductor as a ground side electrode of the capacitor In the spark plug cord, the ground wire portion is formed of a conductive ground core wire and a flat mesh wire that wraps around the outer periphery of the ground core wire.

  According to a second aspect of the invention, there is provided the spark plug cord according to the first aspect, characterized in that a flat mesh wire that wraps around the outer periphery of the ground core wire is covered with a covering member having an insulating property.

  The invention according to claim 3 relates to the spark plug cord according to claim 1 or 2, wherein the cord body has a core material formed of glass fiber and an outer periphery of the core material and is electrically conductive. It is characterized by being formed of a conductive conductor made of a material, the internal wire spirally wound around the outer periphery of the conductive conductor, and the insulator covering the internal wire.

  According to a fourth aspect of the present invention, there is provided the spark plug cord according to any one of the first to third aspects, wherein the conducting wire that wraps a predetermined length of the outer circumference of the cord body is made of a synthetic resin having flexibility. It is covered with an inner tube, and further, the periphery of the inner tube is covered with a heat shield having a heat shielding property.

  The invention according to claim 5 relates to the spark plug cord according to any one of claims 1 to 4, wherein the ground core wire of the ground wire portion and the flat mesh wire that wraps the ground core wire from the surroundings. Is electrically connected using a crimping fitting terminal integrally with a portion of the conducting wire that forms the ground side electrode that is pulled out from the end of the conducting wire that is close to the spark plug fitting. To do.

  The invention according to claim 6 relates to the spark plug cord according to claim 5, wherein the caulking portion between the ground wire portion and the end portion of the conducting wire is on the cord body side in the vicinity of the lead-out portion of the conducting wire. It is characterized by being attached so as to be covered with a heat-resistant cap member made of resin.

  The invention according to claim 7 relates to the spark plug cord according to claim 5 or 6, wherein the cap member holds the inner tube, the heat shield and the cord body in the vicinity of the lead-out portion of the conducting wire. And a caulking holding portion for holding a caulking portion by the caulking metal terminal.

  An eighth aspect of the invention relates to the spark plug cord according to any one of the fifth to seventh aspects, wherein the cap member is formed of a material capable of electromagnetic shielding.

  According to the spark plug cord of the first aspect of the present invention, the capacitor forming the capacitor electrode is formed by the lead wire and the internal electric wire that wraps the range over the predetermined length of the outer periphery of the cord body, and the capacitor is used as the ground side electrode of the capacitor. The ground wire portion provided on the conducting wire is formed of a conductive ground core wire and a flat mesh wire that wraps around the outer periphery of the ground core wire so that the resistance value of the ground wire portion is reduced. For this reason, the energy stored in the capacitor that repeatedly charges and discharges can be stored in a short time, and the amount of stored energy increases, resulting in a large spark generated by the spark plug and greatly improving the combustion efficiency of the internal combustion engine. Yes, the output of the internal combustion engine, torque, fuel consumption, startability, feeling of the internal combustion engine, cleanness of exhaust gas, knocking prevention function, shortening of the time lag in the low speed region of the internal combustion engine in the turbocharger, and mounted acoustic equipment Thus, the potential of the internal combustion engine in various performance aspects such as noise reduction can be effectively improved.

  According to the second aspect of the present invention, since the flat mesh wire that wraps around the outer periphery of the ground core wire is covered with the insulating covering member, the flat mesh wire is an internal combustion engine such as a cylinder head, a body, or the like. Therefore, the earthing effect can be improved since it is possible to prevent a short circuit from being caused by direct electrical contact.

  According to the invention of claim 3, the cord body of the spark plug cord is wrapped around the core material formed of glass fiber with the conductive conductor formed of the conductive material, and the conductive material An internal electric wire is spirally wound around the outer periphery of the conductive conductor. For this reason, unlike the case of using a ferromagnetic material in the form of powder like the conventional one, it uses a conductive conductor and has a simple configuration in which an internal electric wire is wound around in a spiral shape with ultra-low resistance characteristics. As a result, the electric storage performance is improved by the capacitor, and the stored electric energy can be instantaneously supplied to the spark plug through the internal electric wire. As a result, not only the potential of the internal combustion engine can be further improved, but also the generation of magnetic noise can be reduced by the internal electric wire wound spirally.

  According to a fourth aspect of the present invention, the conductive wire that wraps around a predetermined length of the outer circumference of the cord body has a flexible inner tube made of synthetic resin and a heat shielding property that wraps around the inner tube. It is covered with a heat shield. For this reason, it is possible to freely set the ignition plug cord, and it is possible to suppress the deterioration of the spark plug cord constituent member due to the thermal influence received from the internal combustion engine.

  According to a fifth aspect of the present invention, the ground core wire of the ground wire portion and the flat mesh wire that wraps around the outer periphery of the ground core wire are drawn at the end of the conductive wire forming the ground side electrode of the capacitor. Since the electrical connection is made using the crimping metal terminal integrally with the part, a strong and reliable electrical connection is possible. As a result, the grounding current of the conductive wire is reliably grounded through the grounding wire portion having a low resistance value, so that the charge / discharge performance of the capacitor formed in the cord body can be enhanced.

  According to a sixth aspect of the present invention, a heat-resistant cap made of resin is provided on the side of the cord main body in the vicinity of the lead-out portion of the conducting wire, with the caulking portion between the ground wire portion and the end portion of the conducting wire. Since it is attached so as to cover with a member, it is made smart to handle the portion where the ground wire portion branches from the cord body. As a result, the cap member can improve the appearance of the portion where the ground wire portion branches from the cord body, and the cap member can prevent deformation due to the thermal influence from the internal combustion engine, and the spark plug has excellent design as a whole. You will be able to get the code.

  According to the seventh aspect of the present invention, the cap member includes a cord body holding portion that holds the inner tube, the heat shield, and the cord body in the vicinity of the lead-out portion of the conducting wire, and a crimped portion by the crimping metal terminal. Therefore, the cord body holding portion and the crimping holding portion of the cap member can be stably attached to the cord body side by the cap member. Therefore, each end of the ground wire and the conductor is protected from electrical short-circuits and damage accidents due to external forces acting on the end, and can be positioned and fixed stably at the point where it branches off from the cord body. Wiring around the internal combustion engine can be performed in a state of high design, and a spark plug cord having a good appearance can be obtained.

  According to the invention described in claim 8, since the cap member is formed of a material capable of electromagnetic shielding, radiation of electromagnetic waves emitted from the vicinity of the crimping fitting terminal at a location branched from the cord body of the ground wire portion. Can be satisfactorily blocked, and as a result, noise disturbances to the acoustic devices can be suppressed.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS. First, a schematic configuration of the ignition plug cord according to the present embodiment will be described. That is, as shown in FIG. 1, the spark plug cord has a rubber tube 4 with a synthetic resin tube 4 provided with a spark plug fitting 3 at one end of the cord body 1 and a power supply side fitting 5 at the other end. A boot 6 made of steel is provided, the spark plug fitting 3 is connected to the spark plug 2 provided on the cylinder head (not shown) of the internal combustion engine, and the power supply side fitting 5 is connected to a power source terminal (not shown) such as a distributor. ) Can be connected to. Then, the spark plug fitting 3 is connected to the spark plug 2 and the power supply side fitting 5 is connected to the power supply side, so that a current on the power supply side is supplied to an internal wire (described later) provided inside the cord body 1. Thus, the spark plug 2 sparks and the air-fuel mixture in the cylinder of the internal combustion engine is ignited. Further, the end portion of the lead wire 9 (see FIG. 3), which is a flat mesh wire provided so as to wrap the outer periphery of the cord main body 1, is closer to the tube 4 side than the end portion of the ground wire portion 11 through the crimping fitting terminal 10. And can be crimped together. Then, the other end of the ground wire portion 11 whose one end is crimped to the crimping fitting terminal 10 is connected to an appropriate portion of the cylinder head via a terminal fitting 12 by bolt coupling.

  Next, the configuration of the cord main body 1 will be described. The cord main body 1 is sequentially moved from the center to the outer side as shown in FIGS. 3 and 4A (the cross-sectional illustration of the cord main body 1 is omitted). Each component of is arranged. That is, the cord body 1 is covered with a glass fiber core 1a formed of, for example, glass fiber as a core material disposed in the central portion, and an outer periphery of the glass fiber core 1a, and has conductivity such as carbon. Conductive carbon conductor 1b formed of a conductor, and an internal electric wire formed by winding a wire made of SUS304 standard stainless steel excellent in durability at a pitch of 0,77 mm around the periphery of conductive carbon conductor 1b 1c, a silicon-made insulator 1d having a heat-shielding property that covers the outside of the internal electric wire 1c, and a glass fiber coat portion 1e that encloses the outside of the insulator 1d, has high strength, and is resistant to high temperatures. And substantially the same silicon as the insulator 1d covering the outside of the glass fiber coat portion 1e. And manufacturing the insulator 1f is gradually arranged. Further, the cord body 1 configured as described above is formed so as to be flexible as a whole, and can be routed freely. The conductive carbon conductor 1b has the inner wire 1c spirally wound around the outer periphery thereof, so that the electric resistance can be greatly reduced, and for example, an electric resistance value of about 0.5 kΩ / m, which is an optimum value, can be realized. It is something like that.

  Thus, since the conductive carbon conductor 1b can be simply configured to cover the outside of the glass fiber core 1a, the production cost of the spark plug cord can be reduced, and the conductive carbon conductor 1b, the internal electric wire 1c, As a result, the electrical resistance of the internal electric wire 1c is greatly reduced and stable conductive performance is exhibited, so that the electric storage performance of the capacitor is improved. As a result, the stored electric energy is ignited through the internal electric wire. The plug can be instantaneously supplied.

  Instead of the conductive carbon conductor 1b, a conductor other than the carbon conductor may be used as long as it has conductivity. In addition, the code | symbol 8a in FIG. 1 or FIG. 2 is the logo tube made from the synthetic resin which displayed the product name of this applicant logo, and the code | symbol 8b shown in FIG. 1 is the end tube which coat | covers the terminal of the conducting wire 9. Shown respectively.

  In addition, the outer periphery of the cord body 1 manufactured as described above is encased in a conductor 9 formed of a tin-plated annealed copper wire in a range extending over a predetermined length, whereby the internal wire 1c and the conductor 9 Thus, a capacitor is formed in the range of the predetermined length of the cord body 1. Therefore, the internal electric wire 1c side becomes the positive electrode of the capacitor, and the conductive wire 9 becomes the negative electrode of the capacitor. The end 9a of the conductor 9 near the spark plug connector 3 is cut, and the end 9a of the conductor 9 which is the cut portion is integrally crimped together with the end of the ground wire 11 by the crimp terminal 10. Electrically connected.

  Further, the cord body 1 provided with the conducting wire 9 has a heat-insulating heat so as to cover the inner tube 91 made of a synthetic resin having flexibility so as to completely cover the outside of the conducting wire 9 and the periphery thereof. A shield 911 is provided. As a result, the thermal effects of the elements and members constituting the inside of the cord body 1 are minimized, and the durability of the spark plug cord is improved.

  Next, the configuration of the ground wire portion 11 connected to the crimping fitting terminal 10 will be described. That is, as shown in FIG. 5, the cross-sectional structure of the ground wire portion 11 is such that a large number of ground core wires 11a made of, for example, copper fine wires are arranged at the central portion, and the outside is wrapped and bundled with a flat mesh wire portion 11b. Further, the entire outer periphery of the flat mesh portion 11b is covered with a covering member 11c having an insulating property. The ends of the ground core wire 11 a and the flat mesh wire portion 11 b are crimped by a crimping fitting terminal 10 integrally with the end portion 9 a of the conducting wire 9 that wraps around the outer periphery of the cord body 1.

  Next, the cap member 20 that holds the portion crimped by the crimping metal terminal so as to be wrapped will be described. The cap member is formed by molding a synthetic resin material such as polypropylene, for example, as well shown in FIG. 2, FIG. 4B, and FIG. The cap lid 20b having substantially the same shape has a half structure that can be freely opened and closed. A cord main body holding portion and a caulking holding portion are provided on the inner surface side of each cap lid 20b. The cord main body holding portion includes the cord main body 1 in the terminal portion 7 (see FIG. 1) of the cord main body 1 forming the capacitor, the conductive wire 9 wound around the cord main body 9, the inner tube 91 that wraps the outer side of the conductive wire 9, and the outer side thereof. A relatively large-diameter semi-circular first gripping portion 20c that grips the heat shield 911 that surrounds the cord and the cord main body 1 side that does not form a capacitor provided at a position opposite to the first gripping portion 20c. The second grip portion 20d is formed in a semicircular shape having a slightly smaller diameter than the first grip portion 20c. The caulking holding part accommodates and holds a small-diameter semicircular third holding part 20e for holding the ground wire part 11 branched from the cord body 1 forming the capacitor, and the caulking fitting terminal 10. It consists of a metal terminal holding part 20f and an accommodating part 20g for accommodating an exposed part in the vicinity of the end part 9a of the conducting wire 9. Thus, as shown in FIG. 4 (b), the exposed portion of the conductive wire end portion, the cord body 1, and the ground wire portion 11 are adhered to appropriate portions in the cap 20 by the elastic adhesive 20h, and both cap lids 20b are attached. Is closed around the PP hinge 20a, and, for example, both the caps 20b are joined together by an engaging means including a claw (not shown) and an engaging part detachably formed on the claw, and the ground wire part 11 is offset and placed in a state of being spaced apart from the cord body 1 in the vertical direction and fixed.

  Thus, the cap member 10 and the cap member 10 accommodate and hold the end 9a of the lead wire 9 and the end of the ground wire 11 that are drawn from the cord body 1 connected via the close fitting terminal 10. As a result, the ground wire portion 11 can be attached to the cord main body 1 in an attractive manner, so that it can be protected from being damaged by an external force or an electrical short circuit can be prevented, and the cap member 20 can be electromagnetically shielded. Since it is formed by mixing various materials, etc., electromagnetic noise in the vicinity of the crimping fitting terminal 10 can be blocked from leaking to the outside.

  Hereafter, the operation | movement aspect of this Embodiment is demonstrated. When the ignition plug connecting fitting 3 of the ignition plug cord is connected to the ignition plug 2 of the internal combustion engine, the power supply side connecting fitting 5 is connected to the power supply side terminal, and the terminal fitting 12 of the ground wire portion 11 is connected to the cylinder head or the like. At the time of driving, the current generated on the power source side is supplied to the spark plug 2 through the internal electric wire 1c, and the air-fuel mixture burns by the spark generated by the spark plug 2, and an output is obtained. At this time, a capacitor that forms a capacitor electrode is formed by the conductive wire 9 and the internal electric wire 1c that wraps a predetermined length of the outer circumference of the cord body 1, so that the energy stored in the capacitor is supplied to the spark plug 2 through the internal electric wire 1c. Is done. On the other hand, since the ground wire portion 11 connected to the conductive wire 9 serving as the ground side electrode of the capacitor is formed by a ground wire portion 11a having conductivity and a flat wire portion 11b enclosing the outer periphery of the ground wire 11a. The current resistance value of the ground wire portion 11 is small.

  In addition, the ground core wire 11a of the ground wire portion 11 and the flat mesh wire portion 11b that wraps around the outer periphery of the ground core wire 11a are caulked together with the lead-out portion of the end portion 9a of the conductive wire 9 that forms the ground side electrode of the capacitor. Since the metal terminal 10 is used for electrical connection, a strong and reliable electrical connection is possible, and the ground current flowing through the conductive wire 9 is reliably grounded through the ground wire portion 11 having a low resistance value and formed in the cord body. The charging / discharging performance of the capacitor can be improved.

  Therefore, by applying the spark plug cord to the internal combustion engine, the amount of energy temporarily stored in the capacitor increases, the current value increases, the discharge time is shortened, and the spark force generated in the spark plug 2 Thus, misfire is prevented, the air-fuel mixture is reliably burned, and complete combustion can be realized. As a result, the output of the internal combustion engine in the middle and low speed range, torque, fuel consumption, startability, feeling of the internal combustion engine, cleanliness of exhaust gas, knocking prevention function, shortening of the time lag in the low speed region of the internal combustion engine in the turbocharger Thus, the potential of the internal combustion engine can be effectively improved in various performance aspects such as noise reduction of the mounted acoustic equipment.

  Further, since the flat mesh wire portion 11b that wraps around the outer periphery of the ground core wire 11a is covered with an insulating covering member 11c, the flat mesh wire portion is in direct electrical contact with the cylinder head, the mounting body, and the like to cause a short circuit. Can be prevented in advance.

  In the present embodiment, the cord body 1 of the spark plug cord is wrapped around the outer periphery of the glass fiber core 1a with the conductive carbon conductor 1b, and the inner wire 1c is spirally wound around the outer periphery of the conductive carbon conductor 1b. Since it is configured to be wound around, it exhibits stable conductive performance due to the ultra-low resistance effect. As a result, the power storage performance of the capacitor is remarkably improved, and the stored electrical energy can be instantaneously supplied to the spark plug through the internal electric wire, further improving the potential of the internal combustion engine, and further, the internal winding wound in a spiral shape. Generation of magnetic noise can be reduced by the electric wire 1c.

  Moreover, the conducting wire 9 wrapping the range over the predetermined length of the outer circumference of the cord body is covered with a flexible synthetic resin inner tube 91 and a heat shield 911 having a heat shielding property surrounding the inner tube. Therefore, the arrangement of the spark plug cord can be freely set, and the deterioration of the spark plug cord constituent member due to the thermal influence received from the internal combustion engine can be suppressed.

  Further, since the caulking portion between the ground wire portion 11 and the end portion 9a of the conducting wire 9 is attached to the cord main body 1 side using the cap member 20, the appearance appearance is improved and the thermal power received from the internal combustion engine is improved. It becomes possible to prevent deformation and the like due to influence. Moreover, each terminal part of the ground wire part 11 and the conducting wire 9 can be protected from an electrical short circuit, and can be protected from a damage accident caused by an external force acting on the terminal part. Further, since the cap member 20 is formed of a material that can be electromagnetically shielded, it is possible to satisfactorily block the radiation of electromagnetic waves emitted from the vicinity of the crimping fitting terminal 10 and, in turn, suppress noise disturbances to the acoustic devices. You will be able to

It is a top view which shows the whole structure of this invention. It is a principal part enlarged view of the II section of FIG. It is a lineblock diagram explaining the section structure of the cord main part of the spark plug cord concerning the present invention. (A) is an expanded arrow sectional view in the AA line of FIG. 2, (b) is an arrow sectional view in the BB line of FIG. It is sectional drawing in the CC line of FIG. It is the top view which expanded and showed the cap member of the present invention. It is a system diagram which shows the whole structure of the conventional one.

Explanation of symbols

1 Cord body 1a Glass fiber core (core material)
1b Conductive carbon conductor (conductive conductor)
1c Internal wire 1d Insulator 1e Insulator 1f 5 Convex surface 2 Spark plug 3 Spark plug connector 5 Power supply side connector 9 Conductor 9a Conductor end 10 Clamp metal terminal 11 Ground wire 11a Ground core 11b Flat wire (Platinum wire)
11c Cover member 20 Cap member 20a PP hinge 20b Cap lid 91 Inner tube 911 Heat shield

Claims (8)

  One end of an inner wire covered with an insulator is connected to a spark plug fitting, the other end of the inner wire is electrically connected to a power supply side fitting, and a conductor that wraps a predetermined length of the outer circumference of the cord body And a spark plug cord comprising a capacitor forming a capacitor electrode by the internal electric wire and a ground wire portion provided on the conducting wire as a ground side electrode of the capacitor, wherein the ground wire portion has conductivity. An ignition plug cord formed of an earth core wire and a flat net wire that wraps around the outer periphery of the earth core wire.   2. The spark plug cord according to claim 1, wherein a flat mesh wire that wraps around an outer periphery of the ground core wire is covered with a covering member having an insulating property.   The cord body includes a core material formed of glass fiber, a conductive conductor formed of a conductive material that is coated on the outer periphery of the core material, and the inner portion that is spirally wound around the outer periphery of the conductive conductor. The spark plug cord according to claim 1 or 2, wherein the spark plug cord is formed of an electric wire and the insulator covering the inner electric wire.   The conducting wire that wraps the predetermined length of the outer circumference of the cord body is covered with a flexible synthetic resin inner tube, and the periphery of the inner tube is further covered with a heat shield having heat shielding properties. The spark plug cord according to any one of claims 1 to 3, wherein   The ground core wire of the ground wire portion and the flat mesh wire that wraps the ground core wire from the periphery are the end portions of the lead wires that are close to the spark plug fitting, among the conductor wires that form the ground side electrode. The spark plug cord according to any one of claims 1 to 4, wherein the spark plug cord is electrically connected to the pulled-out portion using a crimping fitting terminal.   The caulking portion between the ground wire portion and the end portion of the conducting wire is attached to the cord main body side in the vicinity of the lead-out portion of the conducting wire so as to be covered with a heat-resistant cap member made of resin. The spark plug cord according to claim 5.   The cap member includes a cord main body holding portion that holds an inner tube, a heat shield, and a cord main body in the vicinity of the lead-out portion of the conducting wire, and a crimp holding portion that holds a crimp portion by the crimping fitting terminal. The spark plug cord according to claim 5 or 6, wherein the spark plug cord is provided.   The spark plug cord according to any one of claims 5 to 7, wherein the cap member is made of an electromagnetic shielding material.

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