JPH0755332Y2 - Engine ignition coil mounting structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to an ignition coil mounting structure for an engine.

2. Description of the Related Art Conventionally, in a multi-cylinder engine having a transistor ignition device, an ignition coil is provided for each cylinder. Here, when the magnetic force generated in the ignition coil leaks to the ignition coil mounting portion and its surroundings, the voltage generated in the secondary coil in the ignition coil is lowered, and the spark jump in the ignition plug is deteriorated.

Therefore, in a conventional engine in which the main material of the structural component is magnetic iron, the ignition coil is installed at a location apart from the engine body, and the ignition coil mounting portion is made of a non-magnetic material, and The surroundings of the ignition coil are surrounded by a non-magnetic material, or a space where magnetic force does not reach is secured between the ignition coil and the magnetic material parts around the ignition coil.

Problems to be Solved by the Invention It is necessary to secure a space for mounting the ignition coil at a position away from the main body of the engine, resulting in an increase in size of the entire engine.

Further, a stay made of a non-magnetic material for attaching the ignition coil and a box made of a non-magnetic material surrounding the ignition coil are required, and the number of parts is increasing.

Further, since the ignition coil is attached to a position away from the main body of the engine, the high tension cord connecting the ignition coil and the ignition plug becomes long, and the high tension cord is generated by the long tension cord. Radio noise is also increasing.

Means for Solving the Problems In a multi-cylinder engine in which a spark plug and an ignition coil are connected by a high tension cord, an intake manifold and a cylinder head cover are made of a non-magnetic material, and the ignition coil is located above the intake manifold. And attached to the side surface of the cylinder head cover.

Since the intake manifold and the cylinder head cover are made of a non-magnetic material, the ignition coil is positioned above the intake manifold, and leakage of magnetic force generated in the ignition coil mounted on the side surface of the cylinder head cover is prevented. Also, since the ignition coil is mounted close to the engine body, it is not necessary to provide a space for mounting the ignition coil at a location away from the engine body, and the ignition coil and the ignition plug are connected. The length of the high tension cord used is shortened.

Embodiment An embodiment of the present invention will be described with reference to the drawings. A cylinder head cover 3 is fixed to an upper surface of a cylinder head 2 which is a part of a main body of the engine 1. The cylinder head cover 3 is made of a non-magnetic material such as constituent resin or aluminum alloy. An intake manifold 4 is connected to the side surface of the cylinder head 2, and the intake manifold 4 is also made of a non-magnetic material such as synthetic resin or aluminum alloy.

Next, a large number of mounting bosses 5 and 6 are formed on the side surface of the cylinder head cover 3.
The number of ignition coils 8 equal to the number of cylinders of the engine 1 is attached by the attachment bolts 7 screwed to the 5 and 6.
The ignition coil 8 is arranged above the intake manifold 4.

On the opposite side of the ignition coil 8 in the cylinder head 2 with the cylinder head cover 3 sandwiched therebetween, spark plugs 9 are mounted in the same number as the number of cylinders of the engine 1. Then, the spark plug 9 and the ignition coil 8
And are connected by high tension cord 10.

In such a configuration, when the engine 1 is in operation, a high voltage is generated in the secondary coil of the ignition coil 8, and this high voltage is passed through the high tension cord 10 to the spark plug 9
And the spark is blown off at the spark plug 9.

Here, the intake manifold 4 and the cylinder head cover 3 that are parts located around the ignition coil 8 are formed of a non-magnetic material, and the mounting bosses 5 and 6 for mounting the ignition coil 8 are also formed of a non-magnetic material. Has been formed. Therefore, it is possible to prevent the magnetic force generated in the ignition coil 8 from leaking around the mounting bosses 5 and 6 and the ignition coil 8, and to prevent a decrease in the voltage generated in the secondary coil in the ignition coil 8 to prevent ignition. The sparks in the plug 9 are satisfactorily skipped.

Next, since the ignition coil 8 is attached to the side surface of the cylinder head cover 3, it is not necessary to secure a space for installing the ignition coil 8 at a position away from the main body of the engine 1, and the entire engine 1 is downsized. .

Further, since the ignition coil 8 is attached to the side surface of the cylinder head cover 3, the ignition coil 8 and the ignition plug 9 are attached.
The high-tension cord 10 connecting with and becomes short, and the radio noise generated from the high-tension cord 10 is reduced accordingly.

Advantageous Effects of Invention The present invention is characterized in that the intake manifold and the cylinder head cover of the engine are made of a non-magnetic material as described above, and the ignition coil is positioned above the intake manifold and attached to the side surface of the cylinder head cover. It is possible to prevent the leakage of the magnetic force generated at the same time, prevent the voltage drop that occurs in the secondary coil in the ignition coil, and make the spark plug skip well in the ignition plug. Since it is not necessary to provide a space for attachment at a location away from the main body of the engine, it is possible to reduce the size of the engine as a whole, and further, since the ignition coil is attached close to the main body of the engine, Length of high tension cord that connects the ignition coil and the spark plug It is possible to shorten the distance and reduce the radio noise generated from the high tension cord.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a plan view, FIG. 2 is a front view, and FIG. 3 is a side view. 1 ... Engine, 3 ... Cylinder head cover, 4 ... Intake manifold, 8 ... Ignition coil, 9 ... Spark plug,
10 ... High tension code

Claims (1)

[Scope of utility model registration request] 1. In a multi-cylinder engine in which an ignition plug and an ignition coil are connected by a high tension cord, an intake manifold and a cylinder head cover are made of a non-magnetic material, and the ignition coil is located above the intake manifold. An ignition coil mounting structure for an engine, which is mounted on a side surface of the cylinder head cover.