JP3528209B2 - Ignition code - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition cord for supplying an ignition voltage generated by an ignition coil to a discharge igniter (spark plug) in a gasoline engine.

[0002]

2. Description of the Related Art Conventionally, in a gasoline engine, a high voltage ignition voltage generated by an ignition coil is attached to a combustion chamber through an ignition cord (high tension cord), that is, a spark plug. Is being supplied to. When the spark plug is supplied with the ignition voltage, the spark plug causes a spark discharge in an electrode portion inserted in the combustion chamber, ignites a mixture in the combustion chamber, and causes combustion.

As shown in FIG. 5, the ignition cord has a core wire 1 to which the ignition voltage is supplied, and insulating layers 2 and 3 which surround the core wire 1. The core wire 1 is formed of a conductive metal material such as copper. The insulating layers 2 and 3 are made of an insulating material such as synthetic resin such as so-called synthetic rubber or vinyl. A coil side connection terminal 7 for connecting the core wire 1 to the ignition coil is attached to one end side of the core wire 1. The coil side connection terminal 7 is covered with a cylindrical terminal cover 6 made of an insulating material.

It is necessary that the ignition voltage is supplied to the spark plug at an appropriate ignition timing corresponding to the timing of supply of the air-fuel mixture to the combustion chamber. The ignition timing is controlled by the control by the transistor and the rotating operation of the distributor.

Since a high voltage is supplied to the ignition cord, electromagnetic noise is emitted from the ignition cord. Particularly, at the ignition timing, since the ignition voltage becomes high, noise emitted to the outside of the ignition code increases, and a radio or wireless transceiver installed in the vehicle of the vehicle using the ignition code. Not only the influence of the noise on the electronic device as described above increases, but also the influence of the noise may occur on the electronic device outside the vehicle. The influence of this noise extends to the so-called long wave (LW), medium wave (MW), and short wave (SW) frequency bands.

Conventionally, in order to avoid the influence of noise as described above, a spark plug having resistance is used. Further, in order to avoid the influence of this noise, it is also used to use a resistor-containing ignition code. Further, in order to avoid the influence of such noise, a capacitor is also interveningly connected to the power supply system of the ignition system including the terminals of the spark plug and the ignition coil.

[0007]

In a vehicle equipped with a gasoline engine, in order to reduce fuel consumption by reducing the weight of the vehicle body, improve steering performance by improving the front-rear weight balance of the vehicle body, or to facilitate processing. ,
The so-called FRP is used instead of the conventional metal shell for the vehicle body.
A composite material mainly composed of such a synthetic resin material as described above is used.

In particular, making the engine hood (bonnet) into a composite material means that the engine hood occupies a large area in the outer panel of the vehicle body, and the gasoline engine is a particularly heavy component of the automobile. For,
It is effective in reducing the weight of the vehicle body and improving the front-rear weight balance, and is widely used.

As described above, when the engine hood is made of a composite material, the above-mentioned countermeasures such as using a resistance-equipped ignition cord are used instead of the ignition cord in the interior of the vehicle having the engine hood. The effect of emitted noise cannot be avoided.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, in which the noise caused by the ignition voltage is prevented from being emitted to the outside, and the outer plate of the vehicle body is made of a synthetic resin material. An object of the present invention is to provide an ignition cord capable of avoiding the influence of the noise inside or outside the vehicle in an automobile mainly composed of a composite material.

[0011]

In order to solve the above-mentioned problems and achieve the above-mentioned objects, an ignition cord according to the present invention has a gasoline engine and an outer panel of a vehicle body made of a composite material mainly composed of a synthetic resin material. An ignition cord used in a formed vehicle, which is made of a conductive material and has one end connected to an ignition voltage output terminal of an ignition coil device to form a first connection portion to which an ignition voltage is supplied from the ignition coil, etc. A core wire whose end side serves as a second connection portion for supplying an ignition voltage to the discharge igniter, an insulating layer made of an insulating material covering the periphery of the core wire, and a shield layer made of a conductive material and covering the periphery of the insulating layer, Connected to a shield layer in the vicinity of the first connecting portion, and connecting the shield layer to a metal exterior portion of the ignition coil device. It is characterized in that a chromatography scan line.

[0012]

In the ignition cord according to the present invention, the noise generated by supplying the ignition voltage from the ignition coil for supplying the core wire made of a conductive material to the discharge igniter is generated by the insulating material covering the core wire. Although it passes through the insulating layer, it is shielded by the shield layer which is made of a conductive material and covers the periphery of the insulating layer and which is connected to the metal exterior part of the ignition coil device through the ground wire and is released to the vehicle body. , It is not released to the outside.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings.

The ignition cord according to the present invention is a cord (high tension cord) for supplying a high-voltage ignition voltage generated by an ignition coil to a discharge igniter, that is, a spark plug in a gasoline engine. It is used for connecting between an ignition coil and the spark plug, or between the ignition coil and the distributor and between the distributor and the spark plug. The gasoline engine referred to here includes both a so-called reciprocating type having a cylinder and a piston and a so-called rotary type having a rotor housing and a rotor.

As shown in FIG. 1, the ignition cord has a core wire 1 to which the ignition voltage is supplied, and inner and outer insulating layers 2 and 3 that surround the core wire 1. The core wire 1 is formed of a conductive metal material such as copper. The insulating layers 2 and 3 are made of an insulating material such as synthetic resin such as so-called synthetic rubber or vinyl. The insulating layers 2 and 3 are each formed in a cylindrical shape and cover the periphery of the core wire in a laminated state. The insulating layers 2 and 3 cover the core wire 1 from one end side to the other end side of the core wire 1.

The periphery of the outer insulating layer 3 is covered with a shield layer 4. This shield layer 4 is
A conductive metal material such as copper is braided in a net shape to form a cylindrical shape, and covers the outer insulating layer 3. The shield layer 4 covers the outer insulating layer 3 from one end side to the other end side of the core wire 1.

One end of the core wire 1 serves as a first connecting portion for connecting the core wire 1 to the ignition coil, and a coil side connecting terminal 7 is attached. The coil-side connection terminal 7 is made of a conductive metal material and has a cylindrical shape so that it can be connected to the ignition voltage output terminal of the ignition coil. The coil side output terminal 7 is covered with a cylindrical terminal cover 6 made of an insulating material and having an open front end.

The other end of the core wire 1 has the core wire 1
To the spark plug, and a plug-side connection terminal 8 is attached. The plug-side connection terminal 8 is formed of a conductive metal material and has a cylindrical shape so that it can be connected to a terminal for supplying a voltage to the spark plug.

As shown in FIG. 2, a ground wire 5 is connected to the shield layer 4 by means such as soldering or pressure bonding. The ground wire 5 is made of a conductive metal material. The shield layer 4 and the ground wire 5 may have outer surfaces covered with a cover made of an insulating material.

In the ignition cord according to the present invention constructed as described above, in the gasoline engine, as shown in FIG. 4, the coil side connection terminal 7 is connected to the ignition voltage output terminal of the ignition coil device 103. It The ignition coil device 103 includes a primary coil, a plurality of secondary coils, and an electronic circuit including a transistor that controls the timing of supplying the ignition voltage, that is, the ignition timing. The number of secondary coils in this ignition coil device corresponds to the number of ignition voltage output terminals, and also corresponds to the number of cylinders of a gasoline engine to which the ignition coil device is applied. That is, as many ignition codes as the number of cylinders of the gasoline engine are used.

The ground wire 5 of each ignition cord is connected to the metal portion of the vehicle body of the automobile having the gasoline engine. Since the negative electrode (minus electrode) of the battery, which is the power source for all power sources in the vehicle, is connected to the metal part of the vehicle body, the ground wire 5 is connected to the metal part of the vehicle body. It's now grounded. The ground wire 5 is connected to the metal part of the vehicle body by connecting the ground ring 10 to the tip side of the ground wire 5.
4 and the earth ring 104 is fastened to the metal portion with a screw 105. Also,
When the exterior part of the ignition coil device is made of metal and the exterior part is grounded to the vehicle body, the earth ring 104 is attached to the exterior part of the ignition coil device 103 as shown in FIG. It may be attached to the screw hole 106 provided.

The plug-side connection terminal 8 is connected to the input terminal 102 of the spark plug cap 101, as shown in FIG. This spark plug cap 10
1 has a substantially cylindrical shape, and holds the spark plug on one end side, and has an input terminal 102 connected to the ignition voltage supply terminal of the spark plug on the other end side. There is. That is, the plug-side connection terminal 8 is connected to the ignition voltage supply terminal of the spark plug via the input terminal 102.

The ignition cord supplies the ignition voltage to the core wire 1 from the ignition coil device 103 corresponding to the ignition timing of the gasoline engine, and supplies the ignition voltage to the spark plug of each cylinder. In this ignition cord, electromagnetic noise generated when the core wire is supplied with the ignition voltage is shielded by the shield layer 4 though the insulating layers 2 and 3 pass through, and the earth wire is shielded. Since it is escaped to the vehicle body via 5 there is no discharge to the outside. Therefore, in a vehicle equipped with a gasoline engine configured by using this ignition code, so-called long-wave (LW), medium-wave (MW), and short-wave (SW) frequencies are generated by a radio or a wireless transceiver. Good transmission and reception can be performed over the band.

[0024]

As described above, in the ignition cord according to the present invention, noise generated by supplying the ignition voltage from the ignition coil for supplying the core wire made of the conductive material to the discharge igniter is generated by the core wire. It passes through an insulating layer made of an insulating material that covers the periphery of, but is shielded by a shield layer that covers the periphery of the insulating layer made of a conductive material and is connected to the metal exterior part of the ignition coil device via a ground wire. , Escaped to the car body. Therefore, this noise is not emitted to the outer side of the ignition cord.

That is, according to the present invention, the noise caused by the ignition voltage is prevented from being emitted to the outside, and the vehicle outer panel is composed of a composite material mainly composed of a synthetic resin material. It is possible to provide an ignition cord capable of avoiding the influence of the noise inside or outside the vehicle.

Further, in the ignition cord according to the present invention, in the automobile in which the outer panel of the vehicle body is formed of the composite material mainly composed of the synthetic resin material, the metal portion is small around the engine room, The shield layer can be easily connected to the ground potential in the motor vehicle without having to search for metal parts. Since this ignition cord is always connected to the ignition coil device when used, it is not necessary to extend the ground wire for a long time. Further, by connecting the ground wire to the ignition coil device at the same time when the ignition coil device is attached to the vehicle body, the fastening work can be expected to be facilitated.

Further, in the case of using a number corresponding to the number of cylinders of a gasoline engine, all the ignition cords are connected to the ignition coil device, so that any ignition cord has a useless length. It is not necessary to provide a ground wire for the above, and the tip end side is collectively fastened to one place on the exterior part of the ignition coil device, so that the fastening work is done only once, and a plurality of ground wires are fastened respectively. You can save time.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a configuration of an ignition cord according to the present invention.

FIG. 2 is a perspective view showing a configuration of a connecting portion of the ignition cord to an ignition coil.

FIG. 3 is a perspective view showing a configuration of a connecting portion of the ignition cord to a spark plug.

FIG. 4 is a perspective view showing a state in which the ignition cord is connected to an ignition coil.

FIG. 5 is a perspective view showing a structure of a conventional ignition cord with a part thereof cut away.

[Explanation of symbols]

1 core wire, 2 insulating layer, 4 shield layer, 5 ground wire, 7 coil side connecting terminal, 8 plug side connecting terminal, 101 spark plug cap, 103 ignition coil device

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Claims (2)

(57) [Claims] 1. A gasoline engine is mounted on a vehicle body,
Made of composite material mainly composed of synthetic resin material
Ignition code used in automobiles
Te, made of conductive material, one end ignition coil device
A core wire that is connected to the ignition voltage output terminal of and is supplied with the ignition voltage from the ignition coil, and the other end is a second connection portion that supplies the ignition voltage to the discharge igniter; An insulating layer made of an insulating material covering the periphery of the core wire, a shield layer made of a conductive material and covering the periphery of the insulating layer, and connected to the shield layer in the vicinity of the first connecting portion.
This shield layer is used for the above ignition coil device.
It is connected to the outer portion made of a metal that includes a ground wire
Ignition code characterized by . 2. The gasoline engine in the automobile
The number corresponding to the number of cylinders of gin is used, and each ground wire has the tip side of the above ignition coil device.
It is characterized by being fastened together in one place on the exterior part of
The ignition code according to claim 1.