WO2003091074A1

WO2003091074A1 - Method of grounding car and cable for grounding

Info

Publication number: WO2003091074A1
Application number: PCT/JP2002/004088
Authority: WO
Inventors: Jun Suzuki; Akira Sato
Original assignee: Sun Automobile Corporation
Priority date: 2002-04-24
Filing date: 2002-04-24
Publication date: 2003-11-06
Also published as: JPWO2003091074A1; AU2002253578A1

Abstract

A method of grounding a car capable of effectively deriving the performance of various types of electrical equipment mounted on a vehicle by reducing resistance values in the circuits of the electrical equipment, reducing voltage drops generated in resistance portions, and making smooth the supply of current to the electrical equipment, and a cable for grounding highly resistant to secular changes, usable for long period, and having an excellent performance, the method of grounding the car comprising the steps of grounding one end part of a ground cable (1) having a core of 99.9% or more in purity, formed of copper strands with a tin-plated surface and a small diameter, and having a surface covered with polyvinyl chloride resin or polyolefin resin to one side body (8) of the vehicle, and grounding the other end part to the negative terminal (7) of a battery (20) and the other side body (3) via at least the cylinder head (6) of an engine or an area near the cylinder head.

Description

Description Automotive grounding method and grounding cord

The present invention relates to a grounding method for a motor vehicle capable of maximizing the performance of various mounted devices, electrical components, and the like, and a grounding cord used in the grounding method. Background art

Engines and other equipment and other electrical components mounted on automobiles (hereinafter collectively referred to as “electric components”) receive current from the positive side of the battery and simplify wiring. For this reason, it is common to connect each negative side directly to the body and return to the negative side of the battery via the body.

However, since the electrical conductivity of the steel sheet used for the body of an automobile is generally about 1 Z 10 compared to the copper used for the wire harness, a large resistance is generated.

This resistance has a strong effect on electrical components such as the ignition system, impeding the original potential of the engine.

Therefore, as a means for efficiently using electricity without waste, instead of the conventional grounding means that takes a ground with a body, in Japanese Patent Application Laid-Open No. 2001-287600, a battery is used. A plurality of electrical components are connected in parallel between a power supply line and a ground wire respectively drawn from the positive terminal and the negative terminal of the vehicle, and the ground wire is not short-circuited to the body of the vehicle. The ground wire is routed to both sides of the engine electrically via an engine housing of a vehicle. 2. Description of the Related Art A wiring structure of an automobile has been proposed.

Further, as means for improving the performance of the engine itself, a ground wire having a special structure is arranged between the engine body and the body, for example, as disclosed in Japanese Patent No. 3995184, Japanese Patent Laid-Open No. It is proposed in, for example, Japanese Patent Publication No. 0 1-38444. Although the body earth method described above has an advantage in that the wiring is simplified, the resistance increases due to the poor conductivity of the body itself, and the minus circuit is connected to the minus terminal of the battery via the body. The current flow is not smooth due to the increased resistance due to the longer circuit distance and the resistance generated by the paint film on the body, so the performance of the engine and individual electrical components is not fully exerted.

Also, the cables (ground wires) used in the body grounding method are usually made by twisting the inner conductor with a thick wire, so the flexibility is not sufficient when wiring the body. In addition to its extremely poor performance, the internal conductor is not treated to prevent oxidation, so it lacks durability and weather resistance, is vulnerable to aging, and cannot maintain its performance over a long period of time.

Further, the wiring structure of an automobile proposed in the above-mentioned Japanese Patent Application Laid-Open No. 2001-287640 is disclosed in the section of “Embodiments of the Invention” described in the same Japanese Patent Application Publication No. A first engine harness connecting between a negative electrode terminal of a battery arranged on one side of the engine housing, and a ground connected to the other side of the engine housing and arranged on the other side of the room. A second engine harness connected to a power line, a third engine harness connecting the engine housing to electrical components such as a lamp on the other side, and one side of a room, one end of which is a negative terminal. It consists of a ground wire connected to the

In other words, a ground wire is wired on both sides of the engine housing, and at least a part of the ground wire of the electrical component is connected to one of these ground wires.

-Complicated in the project, which necessitates complicated work. (2) Engine harnesses require a thick harness because power is concentrated, so a connection terminal block with a special structure is required, and the essential purpose of improving the performance of the engine and electrical components themselves is not always sufficient. There are a number of issues that need to be resolved in practice, such as not being planned.

In view of this situation, the present invention can reduce the wiring work of the ground wire in the engine room as much as possible, the resistance value on the circuit of the electrical component is reduced, and the voltage drop generated in the resistance portion is reduced. The purpose of the present invention is to provide a method of grounding an automobile that can more effectively bring out the performance of various electric components mounted on a vehicle by smoothly supplying electric current to the electric components. Things.

Another object of the present invention is to provide a grounding cord that can perform wiring work smoothly when wiring a ground wire, is resistant to aging, and has good performance that can be used for a long time. Things. Disclosure of the invention

To achieve the above object, the invention described in claim 1 of the present invention

Connect a ground wire, one end of which is grounded to one body of the vehicle, to the negative terminal of the battery and at least the engine cylinder head or its vicinity, and then to the other body.

A method for grounding an automobile, characterized in that:

The invention described in claim 2 of the present invention

The vehicle grounding method according to claim 1,

The neighborhood is

Intake manifold and / or surge tank

It is characterized by the following.

The invention described in claim 3 of the present invention

The vehicle grounding method according to claim 1, The ground wire is

After being grounded to the cylinder head of the engine, it should be grounded to the body on the other side of the vehicle via an intermediary hold and a no or surge tank.

It is characterized by the following.

The invention described in claim 4 of the present invention

The vehicle grounding method according to claim 1,

Eye U

After passing through the cylinder head, intake manifold and / or surge tank and transmission of the engine, ground the other body of the vehicle.

It is characterized by the following.

The invention described in claim 5 of the present invention

The vehicle grounding method according to claim 1,

The ground wire is

After passing through the cylinder head and transmission of the engine, ground the other side of the vehicle.

It is characterized by the following.

The invention described in claim 6 of the present invention

The method for grounding an automobile according to any one of claims 1 to 5,

U Bci Earth Itoizumi

One end is connected to the ground point of one headlight and the other end is connected to the ground point of the other headlight.

It is characterized by the following.

The invention described in claim 7 of the present invention

Connect the ground wire, one end of which is grounded, to the body on one side of the vehicle, This is a method for grounding an automobile, characterized by sequentially passing through a terminal, an engine cylinder head, an intake manifold, a surge tank, and a transmission, and then grounding the other side of the body.

The invention described in claim 8 of the present invention

The grounding method for a vehicle according to claim 7,

刖 'Earth Itoizumi,

It is characterized by the following.

The invention described in claim 9 of the present invention

The method for grounding an automobile according to any one of claims 1 to 8,

刖 B self earth request

The core wire is made of thin copper stranded wire, and the surface is covered with resin, brass mesh and resin in sequence.

It is characterized by the following.

The invention according to claim 10 of the present invention

The method for grounding an automobile according to any one of claims 1 to 8,

The ground wire is

Copper connection terminals shall be provided at the connection points of the electrical components in the engine room to the earth point.

It is characterized by the following.

Further, the invention described in claim 11 of the present invention

The core wire shall have a purity of 99.9% or more, and shall be formed of a thin copper stranded wire with a tin-plated surface, and the surface shall be coated with polyvinyl chloride resin or polyolefin resin.

This is a source code that specializes in The invention described in claim 12 of the present invention

In the grounding cord according to claim 11,

The polyvinyl chloride resin or polyolefin resin,

A compound containing a hydrogenated modifier of styrene-butadiene rubber or styrene-isoprene rubber

It is characterized by the following.

The invention described in claim 13 of the present invention

In the grounding cord according to claim 11,

己 Your own core wire

Purity 99.9% or more, the surface is formed of thin copper stranded wire with tin plating, and the surface is sequentially covered with polyvinyl chloride resin or polyolefin resin, brass mesh and resin. That

It is characterized by the following. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an explanatory view showing an example of a ground cord according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a method of connecting the ground cord of the present invention to a negative terminal of a battery.

FIG. 3 is an explanatory view showing one example of a method of grounding a vehicle according to the present invention.

FIG. 4 is a diagram showing a voltage difference when the vehicle grounding method of the present invention is carried out. FIG. 5 is a diagram showing a voltage difference in a conventional automobile grounding method.

FIG. 6 is a diagram showing the relationship between the engine speed and the torque in the vehicle grounding method of the present invention and the conventional method.

FIG. 7 is a diagram showing the relationship between the engine speed and the power in the vehicle grounding method of the present invention and the conventional method.

In the figure, 1 is the grounding cord, 2 is the main ground wire, and 3 to 8 are the connection terminals. It is shown. BEST MODE FOR CARRYING OUT THE INVENTION

The method for grounding an automobile according to the present invention includes connecting a plurality of main electrical components, such as an engine, an intake manifold, a surge tank, and a transmission, mounted on the vehicle with a substantially single ground wire. By connecting one end of the ground wire to one side of the body and the other end to the other side of the body via the negative terminal of the battery, the resistance of each electrical component on the circuit is reduced, The purpose is to maximize the performance of individual products by increasing the value of the current flowing through the product, and also to the grounding cord used for the grounding method of the vehicle.

The grounding cord (grounding wire) used in the vehicle grounding method of the present invention has a very important effect in order to maximize the effect of the above-described grounding method, and is used in the circuit of electrical components. It is necessary to generate electromagnetic waves, etc., without giving rise to the increase in the resistance of the device, and to give noise to electronic equipment, destabilize its operation, and not to give noise to audio equipment and displays. As a requirement, a material with low electrical resistance, that is, copper wire, is used.

Therefore, the grounding cord has a copper stranded wire, especially a copper stranded wire with a small diameter, as the core wire.The surface of this core wire is covered with resin, and a brass mesh is provided on the surface. It is desirable that the outermost layer be provided with a resin coating.

Since the copper wire is preferably as low as possible in electric resistance, copper having a purity of 99.9% or more, more preferably 99.9% or more is used, and more preferably, a tin plating is applied to the surface thereof. The use of such a copper wire reduces the resistance of the electrical components on the circuit and is excellent in corrosiveness, so that the effect can be maintained for a long time.

The aforementioned brass mesh itself reduces the resistance of the electrical components on the circuit. Although it contributes a little, its purpose is to prevent the generation of electromagnetic waves by the grounding cord, noise from electronic equipment due to the grounding cord, instability in operation, noise from audio equipment, display noise, etc. Is to prevent the occurrence of.

When the surface of the core wire made of a very thin copper stranded wire is coated with a resin, the resin is a polyvinyl chloride resin or a polyolefin resin, more preferably, a styrene-butadiene-based or styrene-based resin. —By using polychlorinated vinyl resin or polyolefin resin blended with a modifier consisting of hydrogenated isoprene rubber, the electric characteristics such as capacitance and wavelength shortening rate are greatly improved, Loss can be reduced as much as possible.

As described above, the grounding method for a vehicle according to the present invention includes the steps of: connecting a plurality of main electrical components such as an engine, an intake manifold, a surge tank, and a transmission mounted on the vehicle to a substantially single ground wire; And one end of this ground wire is connected to one side of the body, and the other side is connected to the other side of the body via the negative terminal of the battery. Various types of electrical components such as electrical systems are supplied with current from the positive terminal of the battery using a harness, and the negative side is connected to the vehicle compartment side without being individually grounded to the body. These are connected to several grounding harnesses, respectively, and finally put together and connected to the negative terminal of the battery.

The negative terminal of the battery is connected to one end of one grounding harness that connects the negative side of various electrical components placed in the room, and to the electrical components mounted in the engine room. The ground wire is also connected.

One end of this ground wire is connected to the body of one side of the vehicle via the negative terminal of the battery, and the other end is connected to the body of the opposite side while passing through various electrical components. The connection between each electrical component and the ground wire may be made at the conventional ground wire connection point.

At that time, the existing ground wiring should be left as it is and implemented in an overlapping manner. This can further improve the functions of various electrical components, but the existing ground wiring, which is not always necessary, may be deleted in some cases.

In addition, the ground wire connected to the body may be fixed by fixing the base end directly to the body, but for example, one side of the ground wire connected to the minus terminal may be connected to the front of the body. Connect to the ground point of one of the grounded headlights directly or through a pod, and connect the ground wire via the electrical components in the engine compartment to the other headlight grounded to the front of the pod. By connecting to the grounding point, the value of the current flowing through the bulb of the headlight can be improved by around 25-35% (average 30%), thereby increasing the original bright illuminance of the headlight. It is a preferred means since it can be obtained.

The ground wire passing through the electrical components in the engine room should be connected to the conventional grounding method at least in the vicinity of the cylinder head or cylinder head of the engine, that is, the ground connection to the intake manifold and / or surge tank. The engine torque can be improved by about 5% and the fuel economy can be improved by about 10% at maximum.

Then, by grounding the cylinder head to the intake manifold and the Z or surge tank, the torque can be improved by about 1% compared to the cylinder head alone, and the engine response can be improved. Can also be improved.

Further, by connecting the cylinder head to the transmission via an intake manifold and a Z or a surge tank, the startability of the engine can be further improved.

The ground wire passing through the cylinder head may be partially branched by the cylinder head, or a new ground wire may be used to connect the two cylinder head covers and the cylinder head. By mutually grounding, it is possible to further improve the performance of the engine. If the above-mentioned method is used, in which all electrical components in the engine room are grounded to the body via the ground, not only the effects of the above-mentioned items but also the sound quality of the audio can be improved. Can be done.

FIG. 1 shows an embodiment of a vehicle grounding cord according to the present invention. The grounding cord 1 is composed of one ground wire 2 and six copper connections. Terminals 3, 4, 5, 6, 7, and 8 are arranged at required intervals. In the code 1 for grounding in FIG. 1, the connection terminals 3 and 8 are directly or indirectly connected to the body. The connection terminal 7 is connected to the negative terminal of the battery, the connection terminal 4 is connected to the transmission, the connection terminal 5 is connected to the antenna holder or surge tank, and the connection terminal 6 is connected to the cylinder. Connected to each other.

The gist of the present invention is that when one end of the ground wire is connected to one side of the body and the other is grounded to the other side of the body via a negative terminal of the battery, at least a part of the ground wire is connected to the engine. Of the cylinder head and the transmission, more preferably the cylinder head and the transmission, and the earth connection to the antenna holder and the Z or surge tank respectively. It is.

The grounding cord 1 shown in FIG. 1 has a shape in which the terminals 4, 5, 6, and 7 are branched, and is a single cord as a whole. A plurality of earth wire bodies of arbitrary length are prepared, and two earth wire bodies are jointly fastened with the earth point or connection terminal of each electrical component, so that the whole is substantially integrated. It can be implemented so that it is connected to wiring and grounded.

The connection terminal 7 is formed so as to be connectable to a negative terminal of a battery. In the present invention, the connection terminal 7 is usually used in combination with an existing ground wire, that is, a ground harness wired inside the vehicle. Therefore, when connecting the connection terminal 7 to the negative terminal of the battery, use the vehicle battery terminal extension 22 as shown in Fig. 2 together. It is preferable to continue.

The terminal extension tool 22 can be applied to two types of batteries having different negative electrode terminals, and moreover, differently shaped ground wires can be individually and efficiently connected to the negative electrode terminal of a battery mounted on a vehicle. A connecting member 23 for connecting to the negative electrode terminal 21 of the battery 20 mounted on the vehicle is formed at one end, and a rough surface 25a is formed on the outer peripheral surface at the other end. A plate-shaped evening terminal body 22 a in which the small-diameter negative electrode terminal 25 for extension is integrally erected, and the diameter of the negative terminal 25 or the connecting member 23 attached to the negative terminal 25. And a cylindrical adapter 28 for changing the pressure, and each member is formed of a material having good conductivity.

The connecting member 23 has an inner diameter capable of engaging with a large-diameter 17-mm negative electrode terminal of a vehicle battery composed of two types, a 17-mm negative electrode terminal and a 12-mm negative electrode terminal. An opening 23b of a required width is formed in the frustoconical cylindrical body 23a along the longitudinal direction, and a pair of left and right overhanging pieces 24a, 2b sandwiching the opening 23b. 4b, which is attached to the negative terminal 21 of the battery 20 mounted on the vehicle by tightening the overhanging pieces 24a, 24b between the port 29 and the nut 30. It is configured so that it can be detached.

The overhanging pieces 24a and 24b are tightened with the port 29 and the nut 30 to mount the terminal body 22a to the battery 20, and at least the port 29 is disposed. The upper and lower edges of the overhanging piece 24a are bent outwardly to form a flange integrally, and the rotation of the port 29 is prevented, so that the tightening operation can be performed easily and easily. be able to.

The negative electrode terminal 25 erected on the terminal main body 22a is basically a vehicle battery having a smaller diameter among two types of vehicle batteries consisting of a 17-mm negative electrode terminal and a 12-mm negative electrode terminal. It has a frusto-conical shape with the same shape as the outer shape of the negative electrode terminal of 2 mm.Rough surface 25a is formed in a ring shape with a required width on the outer periphery near the upper end.Rough surface 25a Is formed by knurling, but there is no particular limitation on the means. No.

The adapter 28 is formed of a tubular body that can be externally mounted on the small-diameter negative electrode terminal 25 described above, and has a slit 28 a extending from an upper end to a lower end formed on an outer peripheral portion thereof. The inner diameter is the same as the outer shape of the negative electrode terminal 25. However, considering the ease of mounting, both the negative electrode terminal 25 and the adapter 28 preferably have a truncated conical shape.

The use of the vehicle battery terminal extension 22 having such a configuration will be described below. If the negative electrode terminals of the battery 20 mounted on the vehicle are 12 mm, the battery Remove the connection terminal 27 connecting the ground wire 26 provided between the negative electrode terminal 21 of 20 and the body, and attach the adapter 28 constituting the terminal extension 22 to the negative electrode terminal 21 After the outer diameter is 17 mm, the connecting member 23 of the terminal extension 21 is externally mounted on the adapter 28, and the projecting pieces 24 a and 24 are ported by the port 29 and the nut 30. By narrowing the interval between b, the terminal main body 22 a can be reliably held by the negative electrode terminal 21.

At that time, the base end of the earthing cord 1 that is a unified ground wire of each electrical component arranged in the vehicle is connected to the port 29 and the nut 30 as is clear in FIG. Thus, they are integrally connected to the connection member 23.

When the terminal main body 2 2 a is thus attached to the negative electrode terminal 2 1, this evening — the terminal main body 2 2 a is provided with a small-diameter negative electrode terminal 25, and this negative electrode terminal 25 If the connection terminal 27 previously removed is attached to the battery, the ground wire 26 on the negative side of the battery 20 and the grounding wire 1 for each electrical component are collected and integrated into one. Can be easily installed.

When the mounted battery 20 has a thick connection terminal of 17 mm, the connection member 23 of the terminal main body 22 a is directly attached to the negative terminal 21 of the battery 20, and the bolt 2 After connecting the connecting member 23 integrally to the negative terminal 21 with the nut 9 and the nut 30, the adapter 28 is externally mounted on the small-diameter negative terminal 25, and then the body ground is removed in advance. The connection terminals 27 can be attached. According to the present invention, when one end of the grounding cord is connected to the body on one side of the vehicle and the other end is connected to the other body of the vehicle via the negative terminal of the battery, at least the cylinder in the engine room is connected. By connecting a part of the ground wire to the head, the resistance value of the electrical components on the circuit is greatly reduced, and the current flow is improved. Achieving direct response, drastically reducing the drop in torque, drastically improving startability, improving fuel efficiency, reducing smoke due to incomplete combustion, and reducing hazardous waste gas. Hereinafter, embodiments of the present invention will be described in detail.

Fig. 3 shows an embodiment in which the grounding cord 1 of the present invention is arranged in an engine room of a vehicle. An example of installation will be described. First, a terminal of a vehicle negative wiring is removed from a negative terminal of a battery. The grounding cord 1 shown in FIG. 1 is temporarily placed in the engine room so that the connection terminals 3 to 8 are at predetermined positions. Next, after removing the port for mounting the engine mount of the transmission and fixing the connection terminal 4 to the transmission using the above-mentioned removed port, a step for fixing the cylinder head and the intake manifold is performed. Remove the existing port, and fix the connection terminal 6 to the cylinder head and the connection terminal 5 to the intelligent holder.

In addition, the connection terminal 3 on one side of the grounding cord 1 is fixedly connected to the grounding point of one headlight, the connection terminal 7 is fixedly connected to the negative terminal of the battery, and the other end of the grounding cord 1 is fixed. After the connection terminal 8 on the side is connected and fixed to the body, the connection terminal 8 and the ground point of the other headlight are connected and fixed by a separate grounding cord 11.

Hereinafter, a change in performance will be described by applying the grounding cord 1 of the present invention using a copper wire having a purity of 99.9% to a commercially available automobile. As an evaluation method, first, connect the cylinder head, intake manifold, transmission, and both sides of the vehicle to a commercially available automobile, connect one end to the negative terminal of the battery, and start the battery and cylinder when starting the engine. Figure 4 shows the results of measuring the voltage difference between the heads. FIG. 5 shows the result when the grounding cord of the present invention was not used.

As is apparent from these figures, the maximum value of the voltage difference when the grounding cord of the present invention was used was 160 mV, and the effective value was 29.24 mV, but it was not used. In each case, they are 1.028 V and 180.09 mV, respectively, which clearly show the effect of the present invention.

The engine speed, torque and power are shown in Fig. 6 and Fig. 7. In both figures, the solid line is for the vehicle embodying the present invention, and the dotted line is for the conventional vehicle. In FIG. 6, the torque is significantly increased in the rotation speed range (300 to 600 rpm) in normal driving, and as a result, the riding comfort is extremely good and the fuel efficiency is improved. Is achieved.

From Fig. 7, it can be seen that the power is improved over the entire rotation range, and there is a difference of up to 5 horsepower at the maximum rotation range (800 rpm). This invention clearly improves the engine performance. You can read that it is. Industrial applications

According to the method of grounding a vehicle of the present invention, one end of the grounding cable is grounded to one body of the vehicle, and the other end of the power cord is passed through a negative terminal of a battery and at least a cylinder head in an engine room. The other body is connected to the ground, so that the resistance of the electrical components on the circuit can be greatly reduced to improve the flow of current, while at the same time bringing out the inherent performance of the engine, Achieve direct response, drastically reduce torque drop, greatly improve startability, improve fuel efficiency, smoke due to incomplete combustion, reduce toxic waste gas, etc. Things.

Further, the earth cord of the present invention has a purity of 99.9% or more, and has a required thickness by twisting a thin copper wire having a tin-plated surface, and a mesh or resin made of resin or brass. In this way, the generation of electromagnetic waves can be prevented, and the grounding cord prevents noise in electronic equipment, instability in operation, noise in audio equipment and displays, etc. improves.

In particular, the grounding cord of the present invention uses an ultrafine and surface-treated stranded copper wire, so that the grounding cord itself has good flexibility, oxidation resistance is improved, and durability is improved. It has excellent weather resistance, is resistant to aging, and can maintain its performance for a long period of time.

Therefore, the present invention is capable of maximizing the performance of various devices and electrical components mounted on an automobile, and is widely used as an automobile-related technology.

Claims

The scope of the claims

1. Connect a ground wire, one end of which is grounded to one body of the vehicle, to the negative terminal of the battery and at least the engine cylinder head or its vicinity, and then to the other body. Ground

A grounding method for an automobile, characterized in that:

2. The neighborhood is

It must be an in-car bear and / or surge tank

The method for grounding a motor vehicle according to claim 1, wherein:

3. The ground wire is

The vehicle body according to claim 1, wherein after being connected to a ground of a cylinder head of the engine, the body of the other side is grounded via an intake holder and / or a surge tank. Method.

4. The ground wire is

After passing through the engine cylinder head, intake manifold and Z or surge tank and transmission, ground it to the other body of the vehicle.

The method for grounding a motor vehicle according to claim 1, wherein:

5.

The method for grounding a motor vehicle according to claim 1, wherein:

6. The ground wire is

One end is connected to the ground point of one headlight, and the other end is connected to the ground point of the other headlight.

The method for grounding an automobile according to any one of claims 1 to 5, characterized in that:

7. A ground wire, one end of which is grounded to the body on one side of the vehicle, is routed through the negative terminal of the battery, the cylinder head of the engine, the intake manifold, the surge tank, and the transmission in sequence, and then the other end. A grounding method for an automobile, wherein the body is grounded to a side body.

8. The ground wire is

8. The method for grounding an automobile according to claim 7, wherein:

9. The ground wire is

The core wire shall be formed of thin copper stranded wire and the surface shall be coated with resin, brass mesh and resin sequentially

The method for grounding a motor vehicle according to any one of claims 1 to 8, wherein:

10. The ground wire is

Copper connection terminals must be provided at the connection points of each electrical component in the engine room to the earth point.

1 1. The core wire must have a purity of 99.9% or more, and the surface must be made of tin-plated thin copper stranded wire, and the surface must be covered with polyvinyl chloride resin or polyolefin resin.

A grounding cord characterized by the following.

1 2. The polychlorinated chloride resin or polyolefin resin is

The earthing cord according to claim 11, characterized in that:

1 3. The core wire is

Purity is 99.9% or more, and the surface is formed of thin copper stranded wire with tin plating and the surface is sequentially covered with polyvinyl chloride resin or polyolefin resin, brass mesh and resin. Being

The grounding cord according to claim 11 or 12, characterized in that: