JPH04292887A - Ignition plug - Google Patents

Abstract

PURPOSE:To provide an ignition plug capable of preventing the standing of a lubricating oil or concentrated gas in an internal chamber and releasing a frame as effective for the combustion in a combustion chamber by allowing the internal chamber regulated between a central electrode and a grounding electrode to communicate with the outside. CONSTITUTION:An ignition plug 1 has a central electrode 2 and a grounding electrode 3 having an inclined surface part 6 to enclose the central electrode 2 and forming an internal chamber 4 with the central electrode 2, and a through hole 7 allowing the internal chamber 4 to communicate with the outside is formed in the inclined surface part 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spark plug for an engine, and although it is of course effective for use in a reciprocating engine, it particularly relates to a spark plug suitable for a rotary engine.

0002

[Prior Art] When a conventional spark plug in which a center electrode is surrounded by a ground electrode is used in a rotary engine, when the Apec seal sliding on the inner surface of the rotor housing passes through the spark plug, it is scraped by the Avec seal. The lubricating oil, rich mixture (gas), etc. entered into the internal chamber defined between the center electrode and the ground electrode, and when this accumulates in the internal chamber, the center electrode releases the lubricating oil, rich mixture (gas), etc.
gas), etc. Even if ignition occurs in this state, a complete spark will not be formed, the spark will be weak, and misfire will occur, resulting in further ignition being delayed. Moreover, unburned carbon accumulates in the internal chamber, which may cause ignition failure.

0003

[Problems to be Solved by the Invention] Therefore, in Japanese Patent Application No. 63-124689, the present applicant provided a through hole in the side wall of a cylindrical ground electrode surrounding a center electrode, and The internal chamber communicates with the outside to supply lubricating oil,
We proposed a spark plug in which rich mixture (gas), etc., flows through a through hole. According to the proposed spark plug, the above problems can be solved and a good spark can be generated. By the way, the proposed spark plug has a structure in which a through hole is simply provided in the side wall of a cylindrical ground electrode.
The flame through the through-holes is only radiated laterally and cannot be radiated widely to be effective for combustion in the combustion chamber.

The present invention has been made in view of the above-mentioned points, and its object is to connect an internal chamber defined between a center electrode and a ground electrode to the outside so that lubricating oil, a concentrated mixture, To provide a spark plug which can prevent gas from accumulating in an internal chamber, and can also emit flame for effective combustion in a combustion chamber.

[0005]

[Means for Solving the Problems] According to the present invention, the object is to provide a ground electrode having at least a slope portion, surrounding the center electrode, and forming an internal chamber between the center electrode and the center electrode. This is achieved by a spark plug having a through hole formed in the slope of the ground electrode to communicate the internal chamber to the outside.

In one aspect of the present invention, the ground electrode has a spherical shape;
It has a hemispherical shape or a truncated conical shape. In addition, the number of through holes provided in the slope portion may be one, but preferably, a plurality of through holes are arranged evenly on the slope portion.

[0007]

[Operation] In the spark plug of the present invention constructed as described above, the ground electrode has at least a sloped portion surrounding the center electrode, and a through hole is formed in the sloped portion to communicate the internal chamber to the outside. As a result, the flame in the internal chamber after the spark is generated is emitted in the radial direction through the through hole formed in the slope portion, and contributes to combustion in the combustion chamber.

The present invention will be explained in more detail below based on specific examples shown in the drawings. This will make the invention and further inventions clear.

It should be noted that the present invention is not limited to these specific examples in any way.

0010

[Specific Example] In FIG. 1, a spark plug 1 has a center electrode 2
The spark plug 1 is provided with a ground electrode 3 surrounding the center electrode 2, and an internal chamber 4 is formed between the center electrode 2 and the ground electrode 3. The ground electrode 3 has a hemispherical shape with an opening 5 at the top, and has a sloped portion 6. The slope portion 6 of the ground electrode 3 has a through hole 7 that communicates the internal chamber 4 with the outside, in other words, the combustion chamber of the engine.
It is formed in such a way that a plurality of them are evenly arranged and extend diagonally upward.

As shown in FIG. 2, for example, the spark plug 1 formed in this manner includes a rotor housing 10, a rotor 11 rotating within the rotor housing 10, and a spark plug 1 that is attached to the rotor 11 and slides on the inner surface 12 of the rotor housing 10. Rotary engine 1 consisting of apex seals 13 in contact
It can be attached to 5.

[0012] Rotary engine 1 equipped with spark plug 1
5, the apec seal 1 attached to the rotor 11
3 slides on the inner surface 12 of the rotor housing 10 and passes the spark plug 1 , lubricating oil, rich mixture (gas), etc. pass from the internal chamber 4 to the combustion chamber 14 via the through hole 7 .
Conversely, it flows from the combustion chamber 14 to the internal chamber 4, and the lubricating oil, rich mixture (gas), etc. accumulates in the internal chamber 4, and then the lubricating oil and rich mixture to the center electrode 2 or the ground electrode 3. There is no overlapping phenomenon of gas, etc., and a good spark is generated.

Furthermore, in the spark plug 1, the through hole 7 that communicates the internal chamber 4 with the outside is formed in the inclined surface 6 of the ground electrode 3, so that the flame generated in the internal chamber 4 at the time of ignition passes through the through hole 7. The flame is also radiated diagonally upward over the entire circumference, and the flame is effectively radiated over a wide range into the combustion chamber 14, resulting in good combustion.

Incidentally, the spark plug 1 has the following features as shown in FIG.
The present invention can also be applied to a reciprocating engine 25 that includes a cylinder 20 and a piston 21 that is reciprocatably mounted within the cylinder 20. In this case, the flame generated in the internal chamber 4 of the spark plug 1 is radiated obliquely from the through hole 7, and as a result is emitted widely into the combustion chamber 22. Therefore, in the reciprocating engine 25 equipped with the ignition plaque 1, the combustion speed is high and good combustion can be obtained.

[0015]

[Effects of the Invention] As described above, according to the present invention, since the slope portion of the ground electrode is provided with a through hole that communicates the internal chamber with the outside, the flame generated in the internal chamber can be released radially to the outside. As a result, combustion occurs extremely quickly in the combustion chamber, resulting in good combustion. In addition, when applied to a rotary engine, it is necessary to prevent lubricating oil, rich mixture (gas), etc. from accumulating in the internal chamber, and even covering the center electrode or ground electrode with lubricating oil, rich mixture (gas), etc. It is possible to generate a good spark without any problems.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of a spark plug according to a preferred embodiment of the present invention.

FIG. 2 is an explanatory diagram in which the specific example of the spark plug shown in FIG. 1 is used in a rotary engine.

FIG. 3 is an explanatory diagram in which the specific example spark plug shown in FIG. 1 is used in a reciprocating engine.

[Explanation of symbols]

1 Spark plug 2 Center electrode 3 Ground electrode 4 Inner room 6　Slope part 7 Through hole 15 Rotary engine 25 Reciprocating engine

Claims (4)

[Claims] Claim 1: A ground electrode comprising a center electrode and a ground electrode having at least a slope portion surrounding the center electrode and forming an internal chamber between the center electrode and the slope portion of the ground electrode. The spark plug has a through hole that communicates the internal chamber with the outside. 2. The spark plug according to claim 1, wherein the ground electrode has a spherical shape, a hemispherical shape, or a frustoconical shape. 3. The spark plug according to claim 1, wherein a plurality of through holes are formed. 4. The spark plug according to claim 1, which is applied to a rotary engine.